@import url('https://fonts.googleapis.com/css2?family=Inter:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400&display=swap');

/* ============================================
   WOSL Redesign - Global Styles
   Brand Color: #2075D2 (WOSL Blue)
   Layout Style: Inspired by WYSS full-screen sections
   ============================================ */

/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: #1f2937;
  background: #fff;
  line-height: 1.75;
  overflow-x: hidden;
  min-width: 320px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; text-decoration: none; transition: color .3s, opacity .3s; }
a:hover { opacity: .85; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
.clearfix::after { content: ''; display: table; clear: both; }

/* === Variables via custom properties === */
:root {
  --brand: #2075D2;
  --brand-dark: #185fa8;
  --brand-darker: #124a8c;
  --brand-light: #e8f2fc;
  --brand-lighter: #f0f7ff;
  --accent: #f59e0b;
  --text-primary: #0f1f35;
  --text-secondary: #4a6080;
  --text-light: #8fa4be;
  --bg-light: #f5f8fd;
  --bg-dark: #060f1e;
  --white: #fff;
  --radius-sm: 6px;
  --radius: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,.06);
  --shadow: 0 4px 20px rgba(0,0,0,.08);
  --shadow-md: 0 8px 32px rgba(0,0,0,.10);
  --shadow-lg: 0 16px 48px rgba(0,0,0,.14);
  --transition-fast: all .15s ease;
  --transition: all .25s ease;
  --transition-slow: all .5s ease;
  --max-width: 1400px;
}

/* === Layout === */
.wrapper {
  width: 90%;
  max-width: var(--max-width);
  margin: 0 auto;
  position: relative;
}

/* === Typography === */
.section-title {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 800;
  color: var(--brand);
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -.5px;
}
.section-title span {
  font-size: .42em;
  font-weight: 500;
  color: var(--text-light);
  display: block;
  margin-top: 10px;
  letter-spacing: 3px;
  text-transform: uppercase;
}
.section-subtitle {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.85;
  max-width: 800px;
}

/* === Animations === */
.fade-in { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }
.fade-in-left { opacity: 0; transform: translateX(-40px); transition: opacity .8s ease, transform .8s ease; }
.fade-in-left.visible { opacity: 1; transform: translateX(0); }
.fade-in-right { opacity: 0; transform: translateX(40px); transition: opacity .8s ease, transform .8s ease; }
.fade-in-right.visible { opacity: 1; transform: translateX(0); }
.delay-1 { transition-delay: .1s; }
.delay-2 { transition-delay: .2s; }
.delay-3 { transition-delay: .3s; }
.delay-4 { transition-delay: .4s; }
.delay-5 { transition-delay: .5s; }

/* ============================================
   HEADER / NAVIGATION
   ============================================ */
.site-header {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  z-index: 1000;
  padding: 0 5%;
  transition: background .4s, box-shadow .4s, padding .3s;
}
.site-header.scrolled {
  background: rgba(255,255,255,.97);
  box-shadow: 0 2px 20px rgba(0,0,0,.08);
  backdrop-filter: blur(12px);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  max-width: var(--max-width);
  margin: 0 auto;
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
  white-space: nowrap;
}
.scrolled .logo { color: var(--brand); }
.logo img { height: 90px; width: auto; }
.logo-text { display: flex; flex-direction: column; line-height: 1.3; }
.logo-text small { font-size: 11px; font-weight: 400; opacity: .8; letter-spacing: 1px; }

/* Desktop Nav */
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  font-size: 14.5px;
  font-weight: 500;
  color: rgba(255,255,255,.88);
  padding: 8px 16px;
  border-radius: 8px;
  transition: var(--transition);
  position: relative;
  letter-spacing: .05px;
}
.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 5px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: calc(100% - 32px);
  height: 2px;
  background: rgba(255,255,255,.75);
  border-radius: 1px;
  transition: transform .25s ease;
}
.main-nav a:hover::after,
.main-nav a.active::after {
  transform: translateX(-50%) scaleX(1);
}
.main-nav a:hover,
.main-nav a.active {
  background: rgba(255,255,255,.1);
  color: var(--white);
  opacity: 1;
}
.scrolled .main-nav a { color: var(--text-primary); }
.scrolled .main-nav a::after { background: var(--brand); }
.scrolled .main-nav a:hover,
.scrolled .main-nav a.active {
  background: var(--brand-lighter);
  color: var(--brand);
}
.lang-switch {
  margin-left: 10px;
  padding: 6px 14px;
  border: 1.5px solid rgba(255,255,255,.45);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  color: rgba(255,255,255,.9);
  letter-spacing: .5px;
}
.lang-switch::after { display: none !important; }
.scrolled .lang-switch { border-color: var(--brand); color: var(--brand); }

/* Language divider ( | ) */
.lang-divider {
  color: rgba(255,255,255,.3);
  font-size: 16px;
  font-weight: 300;
  padding: 0 4px;
  user-select: none;
  display: flex;
  align-items: center;
  line-height: 1;
}
.scrolled .lang-divider { color: rgba(0,0,0,.15); }

/* Mobile menu toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}
.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  transition: var(--transition);
  border-radius: 2px;
}
.scrolled .menu-toggle span { background: var(--brand); }
.menu-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================
   HERO BANNER - TWO PART SCROLL REVEAL
   ============================================ */
.hero-wrapper {
  position: relative;
  width: 100%;
}

/* Part 1 */
.hero-part1 {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 700px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 1;
  background-image: url("https://hoohuiedu.hoohui.cn/%E7%A7%91%E7%B4%A0%E4%BC%9A/%E6%96%B0kv");
  background-size: 100% 100%;
  background-position: center center;
  background-repeat: no-repeat;
}
.hero-part1-content {
  position: relative;
  z-index: 3;
  width: 100%;
  min-height: 100%;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0 0 58px;
}
.hero-countdown-wrap {
  width: min(760px, 96%);
  text-align: center;
}
.hero-countdown-title {
  margin: 0 0 10px;
  font-size: clamp(24px, 3vw, 40px);
  font-weight: 700;
  letter-spacing: 1px;
  color: rgba(247, 252, 255, .98);
  text-shadow: 0 8px 18px rgba(6, 18, 35, .52);
}
.hero-countdown-inline {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.flip-clock-unit {
  display: inline-flex;
  align-items: flex-end;
  justify-content: center;
  gap: 6px;
}
.flip-value {
  min-width: 72px;
  font-size: clamp(40px, 6vw, 70px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: 1px;
  color: #ffffff;
  text-shadow: 0 8px 18px rgba(7, 22, 43, .42);
  font-variant-numeric: tabular-nums;
}
.flip-value-day {
  min-width: 96px;
}
.flip-unit-label {
  font-size: clamp(18px, 2.2vw, 28px);
  font-weight: 700;
  letter-spacing: .5px;
  color: rgba(232, 245, 255, .96);
  text-shadow: 0 4px 12px rgba(6, 18, 35, .48);
}
.hero-org-badge {
  font-size: 80px;
  font-weight: 800;
  letter-spacing: 8px;
  opacity: .1;
  line-height: 1;
  margin-bottom: 30px;
}
.hero-main-title {
  font-size: clamp(32px, 5vw, 60px);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
  letter-spacing: 2px;
}
.hero-main-subtitle {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  max-width: min(1100px, 94%);
  margin: 0 auto 24px;
  padding: 10px 22px 12px;
  border: 1px solid rgba(111,194,255,.55);
  border-radius: 8px;
  background: rgba(7,44,88,.24);
  box-shadow: 0 10px 22px rgba(4,24,48,.16);
  backdrop-filter: blur(2px);
}
.hero-main-subtitle-cn {
  font-size: clamp(16px, 1.9vw, 24px);
  font-weight: 600;
  letter-spacing: .4px;
  color: rgba(245,250,255,.96);
  line-height: 1.45;
}
.hero-main-subtitle-en {
  font-size: clamp(13px, 1.35vw, 18px);
  font-weight: 400;
  letter-spacing: .6px;
  color: rgba(216,236,255,.9);
  line-height: 1.55;
}
.hero-main-subtitle-en {
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}
.hero-countdown {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: .2px;
  color: rgba(255,255,255,.88);
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 999px;
  padding: 10px 18px;
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 24px;
}
.hero-part1-info {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
}
.hero-info-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.info-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 2px;
  opacity: .5;
}
.info-value {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 1px;
}
.hero-info-divider {
  width: 1px;
  height: 36px;
  background: rgba(255,255,255,.2);
}

/* Scroll hint arrow - WYSS style */
.scroll-hint {
  position: absolute;
  bottom: 50px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 5;
  width: 30px;
  height: 18px;
  cursor: pointer;
}
.scroll-hint .arrow {
  display: block;
  width: 100%;
  height: 100%;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='30' height='18' viewBox='0 0 30 18'%3E%3Cpath d='M1 1l14 14L29 1' stroke='rgba(255,255,255,.5)' stroke-width='2' fill='none'/%3E%3C/svg%3E") no-repeat center;
  animation: arrowBounce 2s infinite;
}
@keyframes arrowBounce {
  0% { margin-top: 0; }
  50% { margin-top: 16px; }
  100% { margin-top: 0; }
}

/* Part 2 - Scroll Reveal */
.hero-part2 {
  position: relative;
  width: 100%;
  min-height: 100vh;
  overflow: hidden;
  background: linear-gradient(160deg, #071424 0%, #0d3060 50%, #164878 100%);
  color: var(--white);
  display: flex;
  align-items: center;
}
.hero-part2::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 180px;
  background:
    radial-gradient(ellipse at 50% 100%, rgba(127, 198, 255, .18) 0%, rgba(127, 198, 255, .08) 40%, rgba(127, 198, 255, 0) 75%);
  pointer-events: none;
  z-index: 1;
}
.hero-part2-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 70% 40%, rgba(32,117,210,.2) 0%, transparent 50%),
    radial-gradient(ellipse at 20% 80%, rgba(32,117,210,.1) 0%, transparent 40%);
  z-index: 0;
}
.hero-part2-content {
  position: relative;
  z-index: 2;
  padding: 120px 0;
}
.hero-part2-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 80px;
  align-items: center;
  max-width: 900px;
}
.hero-tag {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 3px;
  text-transform: uppercase;
  opacity: .55;
  margin-bottom: 20px;
  padding: 6px 16px;
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 20px;
}
.hero-theme-en {
  font-size: clamp(24px, 3vw, 40px);
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 12px;
  display: inline-block;
  white-space: nowrap;
}
.hero-theme-cn {
  font-size: clamp(28px, 3.5vw, 48px);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 24px;
  background: linear-gradient(90deg, #fff 0%, rgba(255,255,255,.7) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
  white-space: nowrap;
}
.hero-theme-desc {
  font-size: 16px;
  line-height: 1.9;
  opacity: .7;
  margin-bottom: 40px;
  max-width: 520px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* Hero Part2 Right - Stats */
.hero-part2-right {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.hero-stat-card {
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius-lg);
  padding: 32px 36px;
  transition: var(--transition);
}
.hero-stat-card:hover {
  background: rgba(255,255,255,.1);
  border-color: rgba(255,255,255,.2);
  transform: translateX(-8px);
}
.stat-number {
  font-size: 52px;
  font-weight: 200;
  line-height: 1.1;
  color: var(--white);
  margin-bottom: 8px;
}
.stat-label {
  font-size: 15px;
  opacity: .6;
  letter-spacing: 1px;
}

/* Hero Part2 scroll animation states */
.hero-part2 .hero-part2-left,
.hero-part2 .hero-part2-right {
  opacity: 0;
  transform: translateY(60px);
  transition: opacity 1s ease, transform 1s ease;
}
.hero-part2.revealed .hero-part2-left {
  opacity: 1;
  transform: translateY(0);
}
.hero-part2.revealed .hero-part2-right {
  opacity: 1;
  transform: translateY(0);
  transition-delay: .3s;
}

/* Key transition 1: Hero -> Schedule (soft curve) */
.hero-wrapper {
  position: relative;
}
.hero-wrapper::after {
  content: none;
}

/* Global section seam: bidirectional gradient bridge */
.section-seam {
  --seam-upper: rgba(10,22,40,.12);
  --seam-lower: rgba(255,255,255,.12);
  --seam-glow: transparent;
  position: relative;
  height: 110px;
  margin: -55px 0;
  pointer-events: none;
  z-index: 8;
  isolation: isolate;
}
.section-seam::before,
.section-seam::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  height: 100%;
}
.section-seam::before {
  top: 0;
  background: linear-gradient(to bottom, var(--seam-upper) 0%, rgba(0,0,0,0) 72%);
}
.section-seam::after {
  bottom: 0;
  background: linear-gradient(to top, var(--seam-lower) 0%, rgba(0,0,0,0) 72%);
}
.section-seam.section-seam-glow {
  background: radial-gradient(120% 92% at 50% 8%, var(--seam-glow) 0%, rgba(0,0,0,0) 72%);
}
.section-seam-dark-to-light {
  --seam-upper: rgba(9,28,50,.16);
  --seam-lower: rgba(255,255,255,.16);
}
.section-seam-dark-to-light.section-seam-glow {
  --seam-glow: rgba(122,197,255,.12);
}
.section-seam-light-to-dark {
  --seam-upper: rgba(255,255,255,.14);
  --seam-lower: rgba(8,30,55,.14);
}
.section-seam-light-soft {
  --seam-upper: rgba(255,255,255,.1);
  --seam-lower: rgba(232,242,252,.12);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  padding: 13px 30px;
  border-radius: 30px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all .22s ease;
  white-space: nowrap;
  letter-spacing: .1px;
}
.btn-primary {
  background: var(--white);
  color: var(--brand);
  border-color: var(--white);
  box-shadow: 0 4px 16px rgba(255,255,255,.18);
}
.btn-primary:hover {
  background: transparent;
  color: var(--white);
  transform: translateY(-1px);
  opacity: 1;
}
.btn-outline {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,.5);
}
.btn-outline:hover {
  background: var(--white);
  color: var(--brand);
  border-color: var(--white);
  transform: translateY(-1px);
  opacity: 1;
}
.btn-brand {
  background: linear-gradient(135deg, #2075D2 0%, #1860b8 100%);
  color: var(--white);
  border-color: transparent;
  box-shadow: 0 4px 16px rgba(32,117,210,.32);
}
.btn-brand:hover {
  background: linear-gradient(135deg, #1a68c0 0%, #1455a6 100%);
  box-shadow: 0 6px 22px rgba(32,117,210,.44);
  transform: translateY(-1px);
  opacity: 1;
}
.btn-brand-outline {
  background: transparent;
  color: var(--brand);
  border-color: var(--brand);
}
.btn-brand-outline:hover {
  background: var(--brand);
  color: var(--white);
  transform: translateY(-1px);
}
.btn-sm { padding: 9px 22px; font-size: 14px; }
.btn-arrow::after { content: '\2192'; margin-left: 4px; transition: transform .25s; }
.btn-arrow:hover::after { transform: translateX(5px); }

/* ============================================
   SECTION: SCHEDULE (会议日程)
   ============================================ */
.section-schedule {
  min-height: 900px;
  padding: 120px 0;
  background: var(--white);
  display: flex;
  align-items: center;
}
.schedule-header {
  margin-bottom: 50px;
}
.schedule-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 50px;
  border-bottom: none;
  background: var(--bg-light);
  padding: 5px;
  border-radius: var(--radius-xl);
  width: fit-content;
}
.schedule-tab {
  padding: 11px 32px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-bottom: none;
  margin-bottom: 0;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
  border-radius: var(--radius-lg);
}
.schedule-tab:hover {
  color: var(--brand);
  background: rgba(255,255,255,.75);
}
.schedule-tab.active {
  color: #fff;
  background: linear-gradient(135deg, #2075D2 0%, #1860b8 100%);
  box-shadow: 0 4px 14px rgba(32,117,210,.28);
  border-bottom-color: transparent;
}
.schedule-day {
  display: none;
}
.schedule-day.active {
  display: block;
}
.schedule-item {
  display: grid;
  grid-template-columns: 160px 1fr 140px;
  gap: 30px;
  align-items: center;
  padding: 26px 16px;
  border-bottom: 1px solid #edf1f7;
  transition: var(--transition);
  border-radius: var(--radius-lg);
}
.schedule-item:hover {
  padding-left: 22px;
  background: linear-gradient(90deg, #edf5ff 0%, var(--bg-light) 60%, #fff 100%);
  border-bottom-color: transparent;
  box-shadow: 0 4px 18px rgba(32,117,210,.07);
}
.schedule-item:last-child { border-bottom: none; }
.schedule-time {
  display: flex;
  align-items: center;
  gap: 6px;
}
.time-start {
  font-size: 28px;
  font-weight: 200;
  color: var(--brand);
  letter-spacing: 1px;
}
.time-sep {
  font-size: 18px;
  color: var(--text-light);
  margin: 0 2px;
}
.time-end {
  font-size: 16px;
  color: var(--text-light);
}
.schedule-info h4 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 5px;
  letter-spacing: -.1px;
}
.schedule-info p {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.65;
}
.schedule-location {
  font-size: 12.5px;
  color: var(--text-secondary);
  text-align: right;
  padding: 5px 14px;
  border: 1px solid #dde8f4;
  border-radius: 20px;
  display: inline-block;
  white-space: nowrap;
  justify-self: end;
  background: #f5f9ff;
}

/* ============================================
   SECTION: SPEAKERS (会议嘉宾)
   ============================================ */
.section-speakers {
  min-height: 900px;
  padding: 120px 0;
  background: linear-gradient(160deg, var(--bg-dark) 0%, #0d2845 50%, #122f50 100%);
  color: var(--white);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
}
.section-speakers::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 15% 50%, rgba(32,117,210,.15) 0%, transparent 50%),
    radial-gradient(ellipse at 85% 20%, rgba(32,117,210,.08) 0%, transparent 40%),
    radial-gradient(ellipse at 50% 90%, rgba(10,22,40,.5) 0%, transparent 50%);
  z-index: 0;
}
.section-speakers::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 210px;
  background:
    radial-gradient(ellipse at 50% 100%, rgba(109, 185, 246, .16) 0%, rgba(109, 185, 246, .07) 45%, rgba(109, 185, 246, 0) 78%);
  z-index: 0;
  pointer-events: none;
}
.section-speakers > .wrapper { position: relative; z-index: 1; }
.section-speakers .section-title { color: var(--white); }

/* Key transition 2: Speakers -> Papers (soft curve) */
.section-speakers .wrapper::after {
  content: none;
}

.speakers-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 24px;
  margin-top: 60px;
}
.speaker-card {
  text-align: center;
  transition: all .3s ease;
  padding: 20px 12px;
  border-radius: var(--radius-xl);
  border: 1px solid rgba(255,255,255,.06);
  cursor: default;
}
.speaker-card:hover {
  transform: translateY(-10px);
  background: rgba(255,255,255,.06);
  border-color: rgba(255,255,255,.14);
  box-shadow: 0 16px 40px rgba(0,0,0,.2);
}
.speaker-photo {
  width: 100%;
  aspect-ratio: 1;
  border-radius: var(--radius-xl);
  overflow: hidden;
  margin-bottom: 16px;
  position: relative;
}
.speaker-photo-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(32,117,210,.18), rgba(32,117,210,.04));
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .3s ease;
}
.speaker-card:hover .speaker-photo-placeholder {
  background: linear-gradient(135deg, rgba(32,117,210,.28), rgba(32,117,210,.10));
  border-color: rgba(255,255,255,.22);
}
.speaker-info h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 6px;
  letter-spacing: -.1px;
}
.speaker-info p {
  font-size: 12.5px;
  line-height: 1.55;
  color: rgba(255,255,255,.5);
}

/* ============================================
   SECTION: KEPU RESOURCES (科普资源荟)
   ============================================ */
.section-kepu-resources {
  padding: 110px 0 90px;
  background: linear-gradient(175deg, #f6f9ff 0%, #ffffff 60%);
}
#kepu-resources {
  scroll-margin-top: 100px;
}
.kepu-resources-head {
  margin-bottom: 32px;
}
.kepu-resources-intro {
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-secondary);
  max-width: 860px;
  margin-bottom: 0;
}

/* Meta bar */
.kepu-meta-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 32px;
  margin-bottom: 40px;
  padding: 18px 24px;
  background: linear-gradient(135deg, #eef4ff 0%, #f4f8ff 100%);
  border: 1px solid #d6e4f7;
  border-radius: var(--radius-lg);
}
.kepu-meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-secondary);
}
.kepu-meta-item svg { color: var(--brand); flex-shrink: 0; }
.kepu-meta-item strong { color: var(--text-primary); }

/* Main two-column grid */
.kepu-main-grid {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 24px;
  margin-bottom: 24px;
  align-items: start;
}
.kepu-col-left,
.kepu-col-right {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Cards */
.kepu-card {
  background: #fff;
  border: 1px solid #dde8f6;
  border-radius: var(--radius-lg);
  padding: 26px 28px;
  box-shadow: 0 2px 12px rgba(32,117,210,.05);
  transition: var(--transition);
}
.kepu-card:hover {
  box-shadow: 0 6px 24px rgba(32,117,210,.1);
  border-color: rgba(32,117,210,.25);
}
.kepu-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid #e8eef8;
}
.kepu-card-header svg { color: var(--brand); flex-shrink: 0; }
.kepu-card-header h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}
.kepu-card-text {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin: 0;
}

/* Org card */
.kepu-org-list { display: flex; flex-direction: column; gap: 10px; }
.kepu-org-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.kepu-org-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--brand);
  background: rgba(32,117,210,.08);
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  width: fit-content;
}
.kepu-org-names {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.6;
}

/* Categories grid */
.kepu-categories-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 16px 0 14px;
}
.kepu-category-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px;
  background: #f7faff;
  border: 1px solid #e4edf8;
  border-radius: 10px;
  transition: var(--transition);
}
.kepu-category-item:hover {
  background: #edf3ff;
  border-color: rgba(32,117,210,.3);
}
.kepu-cat-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.kepu-cat-1 { background: rgba(32,117,210,.12); color: #2075d2; }
.kepu-cat-2 { background: rgba(16,185,129,.12); color: #059669; }
.kepu-cat-3 { background: rgba(139,92,246,.12); color: #7c3aed; }
.kepu-cat-4 { background: rgba(245,158,11,.12); color: #d97706; }
.kepu-category-item strong {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.kepu-category-item p {
  font-size: 12.5px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}
.kepu-cat-note {
  font-size: 12.5px;
  color: var(--text-light);
  line-height: 1.7;
  background: #f9fbff;
  border-left: 3px solid var(--brand);
  padding: 10px 14px;
  border-radius: 0 6px 6px 0;
  margin: 0;
}

/* Requirements */
.kepu-requirements { display: flex; flex-direction: column; gap: 18px; }
.kepu-req-section h4 {
  font-size: 13px;
  font-weight: 700;
  color: var(--brand);
  margin: 0 0 10px;
  letter-spacing: .3px;
}
.kepu-ol {
  padding-left: 18px;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.kepu-ol li {
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--text-secondary);
}
.kepu-link {
  color: var(--brand);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.kepu-link:hover { opacity: .8; }

/* Rules section */
.kepu-rules-section { margin-bottom: 24px; }
.kepu-rules-card { }
.kepu-rules-ol { columns: 2; column-gap: 32px; }
.kepu-rules-ol li { break-inside: avoid; }

/* CTA bar */
.kepu-cta-bar {
  background: linear-gradient(135deg, #1a5fad 0%, #2075d2 55%, #3a8fe8 100%);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  color: #fff;
}
.kepu-cta-content {
  display: flex;
  gap: 40px;
  align-items: flex-start;
  margin-bottom: 24px;
}
.kepu-cta-text { flex: 1; }
.kepu-cta-text h4 {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 10px;
  color: #fff;
}
.kepu-cta-text p {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255,255,255,.85);
  margin: 0 0 8px;
}
.kepu-cta-note {
  font-size: 13px !important;
  color: rgba(255,255,255,.7) !important;
  font-style: italic;
}
.kepu-cta-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-start;
  flex-shrink: 0;
  min-width: 180px;
}
.kepu-cta-actions .btn-primary {
  background: #fff;
  color: var(--brand);
  border-color: #fff;
  width: 100%;
  text-align: center;
  justify-content: center;
}
.kepu-cta-actions .btn-primary:hover { background: rgba(255,255,255,.9); }
.kepu-cta-actions .btn-outline {
  border-color: rgba(255,255,255,.6);
  color: #fff;
  width: 100%;
  text-align: center;
  justify-content: center;
}
.kepu-cta-actions .btn-outline:hover { border-color: #fff; background: rgba(255,255,255,.1); }
.kepu-extract-code {
  font-size: 13px !important;
  color: rgba(255,255,255,.75) !important;
  margin: -4px 0 0 !important;
  text-align: center;
  width: 100%;
}
.kepu-extract-code strong { color: #fff; }
.kepu-issuers {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  font-size: 13px;
  color: rgba(255,255,255,.7);
  border-top: 1px solid rgba(255,255,255,.2);
  padding-top: 18px;
}
.kepu-issuer-date { color: rgba(255,255,255,.55); font-size: 12px; }
.kepu-issuer-sep { color: rgba(255,255,255,.3); }

/* Responsive */
@media (max-width: 1024px) {
  .kepu-main-grid { grid-template-columns: 1fr; }
  .kepu-rules-ol { columns: 1; }
}
@media (max-width: 640px) {
  .section-kepu-resources { padding: 60px 0; }
  .kepu-categories-grid { grid-template-columns: 1fr; }
  .kepu-cta-content { flex-direction: column; }
  .kepu-cta-actions { width: 100%; }
  .kepu-cta-actions .btn-primary,
  .kepu-cta-actions .btn-outline { width: 100%; }
  .kepu-meta-bar { flex-direction: column; gap: 10px; }
}

/* ============================================
   SECTION: REGISTRATION (会议注册)
   ============================================ */
.section-registration {
  padding: 110px 0;
  background: #ffffff;
}
#registration {
  scroll-margin-top: 100px;
}
.registration-head {
  margin-bottom: 36px;
}
.registration-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.registration-card {
  background: linear-gradient(160deg, #f9fcff 0%, #f4f8ff 100%);
  border: 1px solid #dbe7f6;
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
}
.registration-card:hover {
  box-shadow: 0 8px 28px rgba(32,117,210,.09);
  border-color: rgba(32,117,210,.2);
}
.registration-card h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 14px;
  letter-spacing: -.1px;
}
.registration-card h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 16px 0 8px;
}
.registration-card p,
.registration-card li {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.85;
}
.registration-card ol {
  padding-left: 20px;
}
.registration-meta {
  margin-top: 20px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.registration-chip {
  font-size: 14px;
  color: #144984;
  background: #e8f2fc;
  border: 1px solid #c7ddf6;
  border-radius: 999px;
  padding: 8px 14px;
}
.registration-actions {
  margin-top: 24px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.registration-step {
  margin-top: 22px;
  background: #f8fbff;
  border: 1px solid #dbe7f6;
  border-radius: var(--radius-lg);
  padding: 18px 20px;
}
.registration-consent {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary);
}
.registration-consent input {
  margin-top: 3px;
}
.registration-unlock-btn {
  margin-top: 14px;
}
.registration-unlock-btn:disabled {
  opacity: .6;
  cursor: not-allowed;
}
.registration-step-tip {
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-light);
}
.registration-form-wrap {
  margin-top: 18px;
  background: #fff;
  border: 1px solid #dbe7f6;
  border-radius: var(--radius-lg);
  padding: 24px;
}
.registration-form-wrap h3 {
  margin: 0 0 8px;
  color: var(--brand);
}
.registration-form-note {
  margin: 0 0 16px;
  font-size: 14px;
  color: var(--text-secondary);
}
.registration-form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px 16px;
  margin-bottom: 16px;
}
.registration-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.registration-field.full {
  grid-column: 1 / -1;
}
.registration-field label {
  font-size: 13px;
  color: #2a3f57;
  font-weight: 600;
}
.required-star {
  color: #e11d48;
}
.registration-field input,
.registration-field textarea,
.registration-field select {
  width: 100%;
  border: 1.5px solid #ccd8e8;
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 14px;
  outline: none;
  background: #fff;
  font-family: inherit;
  color: var(--text-primary);
  transition: border-color .2s ease, box-shadow .2s ease;
}
.registration-field input::placeholder,
.registration-field textarea::placeholder {
  color: var(--text-light);
}
.registration-field input:focus,
.registration-field textarea:focus,
.registration-field select:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(32,117,210,.12);
}
.registration-field textarea {
  min-height: 96px;
  resize: vertical;
}
.hidden {
  display: none !important;
}
.registration-policy-list {
  margin-top: 6px;
  padding-left: 18px;
}
.registration-policy-list li {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ============================================
   SECTION: PAPERS (论文征集)
   ============================================ */
.section-papers {
  min-height: auto;
  padding: 120px 0;
  background: var(--bg-light);
  display: block;
}
#papers {
  scroll-margin-top: 100px;
}
.papers-section-head {
  margin-bottom: 32px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(32, 117, 210, .12);
}
.papers-section-head .section-title {
  margin-bottom: 14px;
}
.papers-section-head .papers-desc {
  max-width: 100%;
}
.papers-split {
  display: grid;
  grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
  gap: 28px 40px;
  align-items: start;
  width: 100%;
}
.papers-sidebar {
  position: sticky;
  top: 92px;
  align-self: start;
  min-width: 0;
  max-width: 100%;
}
.papers-sidebar .papers-info-list {
  margin-bottom: 0;
  box-shadow: 0 8px 24px rgba(18, 65, 118, .06);
}
/* 侧栏较窄：模板行改为「上：图标+标题 / 下：下载」，避免横向溢出盖住右侧议题区 */
.papers-sidebar .papers-info-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  grid-template-rows: auto auto;
  column-gap: 12px;
  row-gap: 10px;
  align-items: start;
}
.papers-sidebar .papers-info-icon {
  grid-column: 1;
  grid-row: 1;
  width: 44px;
  height: 44px;
}
.papers-sidebar .papers-info-main {
  grid-column: 2;
  grid-row: 1;
  min-width: 0;
}
.papers-sidebar .papers-info-actions {
  grid-column: 1 / -1;
  grid-row: 2;
  width: 100%;
  justify-content: flex-end;
}
.papers-main-col {
  min-width: 0;
}
.papers-desc {
  font-size: 16px;
  line-height: 2;
  color: var(--text-secondary);
  margin-bottom: 14px;
}
.papers-deadline {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  font-weight: 700;
  color: #9a5200;
  background: linear-gradient(180deg, #fff8ea 0%, #fff2d9 100%);
  border: 1px solid #f3d19c;
  border-radius: 999px;
  padding: 8px 14px;
  margin: 0 0 22px;
}
.papers-info-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 26px;
  padding: 14px;
  border: 1px solid #dbe8f7;
  border-radius: 16px;
  background: linear-gradient(180deg, #f9fcff 0%, #f4f9ff 100%);
}
.papers-info-entry {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.papers-info-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 12px 12px;
  border-radius: 12px;
  background: #ffffff;
  border: 1px solid #e5eef9;
}
.papers-info-main {
  flex: 1;
}
.papers-inline-submit {
  margin-top: 10px;
}
.papers-info-actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.papers-info-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brand);
  box-shadow: 0 2px 12px rgba(32,117,210,.12);
}
.papers-info-item strong {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  display: block;
  margin-bottom: 2px;
}
.papers-info-item p {
  font-size: 14px;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.5;
}
.papers-download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-width: 116px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid rgba(32,117,210,.3);
  background: rgba(32,117,210,.08);
  color: var(--brand);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  transition: transform .2s ease, background .2s ease, border-color .2s ease, color .2s ease;
}
.papers-download-btn:hover {
  transform: translateY(-1px);
  background: rgba(32,117,210,.14);
  border-color: rgba(32,117,210,.55);
  color: #0f5bb2;
}
.papers-download-btn svg {
  opacity: .9;
}
.papers-submit-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-width: 116px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--brand);
  background: var(--brand);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition: transform .2s ease, background .2s ease, border-color .2s ease, color .2s ease;
}
.papers-submit-btn:hover {
  transform: translateY(-1px);
  background: var(--brand-dark);
  border-color: var(--brand-dark);
}
.papers-submit-btn-outline {
  background: transparent;
  color: var(--brand);
}
.papers-submit-btn-outline:hover {
  background: rgba(32,117,210,.1);
  border-color: rgba(32,117,210,.6);
  color: var(--brand);
}
.paper-submit-wrap {
  max-width: 860px;
  margin: 0 auto;
}
.paper-file-input {
  border-width: 1.5px !important;
  border-color: #a7c7ea !important;
  border-radius: 10px !important;
  background: linear-gradient(180deg, #f9fcff 0%, #f4f9ff 100%) !important;
  color: #334a63;
  transition: border-color .2s ease, box-shadow .2s ease, background .2s ease;
  cursor: pointer;
}
.paper-file-input:hover {
  border-color: #7aaee3 !important;
  background: linear-gradient(180deg, #f5faff 0%, #edf6ff 100%) !important;
}
.paper-file-input:focus-visible {
  outline: none;
  border-color: var(--brand) !important;
  box-shadow: 0 0 0 3px rgba(32,117,210,.12);
}
.paper-file-input::file-selector-button {
  border: 0;
  border-radius: 8px;
  padding: 8px 14px;
  margin-right: 12px;
  font-size: 13px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(180deg, #2f84e1 0%, #1f6fc9 100%);
  box-shadow: 0 4px 10px rgba(28, 95, 173, .25);
  cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.paper-file-input:hover::file-selector-button {
  transform: translateY(-1px);
  box-shadow: 0 6px 14px rgba(28, 95, 173, .32);
  background: linear-gradient(180deg, #3a8feb 0%, #2b7dd7 100%);
}
.paper-file-input::-webkit-file-upload-button {
  border: 0;
  border-radius: 8px;
  padding: 8px 14px;
  margin-right: 12px;
  font-size: 13px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(180deg, #2f84e1 0%, #1f6fc9 100%);
  box-shadow: 0 4px 10px rgba(28, 95, 173, .25);
  cursor: pointer;
}
.upload-hint {
  margin-top: 6px;
  font-size: 12px;
  color: #5f7087;
}
.papers-entry-submit {
  display: flex;
  justify-content: flex-end;
  padding-right: 2px;
}
.papers-go-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 14px;
  border-radius: 999px;
  border: 1px solid rgba(47,105,175,.25);
  background: rgba(22,75,145,.06);
  color: #1e4f87;
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  transition: transform .2s ease, background .2s ease, border-color .2s ease;
}
.papers-go-btn:hover {
  transform: translateY(-1px);
  background: rgba(22,75,145,.12);
  border-color: rgba(30,79,135,.45);
}
.papers-go-btn svg {
  opacity: .88;
}
.papers-flow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 34px;
  padding: 12px 14px;
  border: 1px dashed #c9ddf4;
  border-radius: 12px;
  background: #f8fbff;
}
.papers-flow-item {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 38px;
  border-radius: 10px;
  background: #ffffff;
  border: 1px solid #e5eef9;
  color: #24476d;
  font-size: 13px;
  font-weight: 600;
}
.papers-flow-item span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(32,117,210,.12);
  color: var(--brand);
  font-size: 11px;
  font-weight: 700;
}
.papers-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.papers-journals {
  margin-top: 48px;
  padding-top: 36px;
  border-top: 1px solid rgba(32, 117, 210, .12);
}
.papers-journals h4 {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.papers-journals-lead {
  font-size: 15px;
  line-height: 1.9;
  color: var(--text-secondary);
  margin-bottom: 18px;
}
.journals-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  align-items: stretch;
}
.journal-card {
  height: 100%;
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid #dbe7f6;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 8px 22px rgba(16, 51, 92, .08);
  transition: transform .25s ease, box-shadow .25s ease;
}
.journal-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 28px rgba(16, 51, 92, .14);
}
.journal-cover {
  width: 100%;
  height: 220px;
  object-fit: contain;
  object-position: center;
  display: block;
  padding: 8px;
  background: #f4f8ff;
  border-bottom: 1px solid #e5eef9;
}
.journal-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 16px 16px 18px;
}
.journal-body h5 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}
.journal-body p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: 16px;
}
.journal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
}
.journal-body a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 40px;
  padding: 9px 14px;
  border-radius: 999px;
  border: 1px solid rgba(32,117,210,.28);
  color: var(--brand);
  background: rgba(32,117,210,.06);
  font-size: 13px;
  font-weight: 700;
  line-height: 1;
}
.journal-body a:hover {
  background: rgba(32,117,210,.12);
  border-color: rgba(32,117,210,.52);
}

/* Papers Right - Topics A+B */
.papers-topics h4 {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}
.topics-layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 16px;
}
.topic-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: sticky;
  top: 94px;
}
.topic-nav-item {
  width: 100%;
  text-align: left;
  padding: 11px 12px;
  border: 1px solid #d6e4f5;
  border-radius: 10px;
  background: #fff;
  color: #2c4f76;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s ease;
  line-height: 1.4;
}
.topic-nav-item:hover {
  border-color: rgba(32,117,210,.45);
  background: var(--brand-lighter);
}
.topic-nav-item.active {
  background: linear-gradient(90deg, #eef5ff 0%, #f2f7ff 100%);
  border-color: rgba(32,117,210,.4);
  border-left: 3px solid var(--brand);
  color: #1c4d85;
  box-shadow: 0 4px 12px rgba(18, 65, 118, .08);
  padding-left: 10px;
}
.topic-panel-wrap {
  min-width: 0;
}
.topic-panel {
  display: none;
  background: linear-gradient(180deg, #ffffff 0%, #fbfdff 100%);
  border: 1px solid #dce8f7;
  border-radius: 14px;
  box-shadow: 0 6px 18px rgba(18, 65, 118, .08);
}
.topic-panel.active {
  display: block;
}
.topic-mobile-trigger {
  display: none;
}
.topic-panel-body {
  padding: 18px 18px 16px;
}
.topic-num {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 800;
  color: var(--brand);
  background: rgba(32,117,210,.1);
  border: 1px solid rgba(32,117,210,.24);
  line-height: 1;
}
.topic-text {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.45;
}
.topic-desc {
  margin-top: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-secondary);
}
.topic-subtitle {
  margin-top: 10px;
  font-size: 13px;
  font-weight: 700;
  color: #1f3f65;
}
.topic-points {
  margin-top: 8px;
  padding-left: 18px;
  display: grid;
  gap: 6px;
}
.topic-points li {
  font-size: 13px;
  line-height: 1.75;
  color: #365a81;
}

/* ============================================
   SECTION: VENUE (会场信息)
   ============================================ */
.section-venue {
  position: relative;
  min-height: 700px;
  padding: 120px 0;
  overflow: hidden;
  display: flex;
  align-items: center;
}
.venue-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(10,22,40,.92) 0%, rgba(13,48,96,.85) 50%, rgba(22,72,120,.8) 100%);
  z-index: 1;
}
.venue-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 30% 50%, rgba(32,117,210,.15) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 30%, rgba(255,255,255,.03) 0%, transparent 40%);
}
.venue-bg::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 190px;
  background:
    radial-gradient(ellipse at 50% 100%, rgba(122, 197, 255, .15) 0%, rgba(122, 197, 255, .06) 44%, rgba(122, 197, 255, 0) 78%);
  pointer-events: none;
}
.section-venue > .wrapper {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: flex-start;
}
.venue-content {
  max-width: 760px;
  color: var(--white);
}
.venue-tag {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 3px;
  opacity: .5;
  margin-bottom: 24px;
  padding: 6px 16px;
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 20px;
}
.venue-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 8px;
}
.venue-title-en {
  font-size: clamp(16px, 2vw, 22px);
  font-weight: 400;
  opacity: .5;
  margin-bottom: 30px;
}
.venue-desc {
  font-size: 16px;
  line-height: 2;
  opacity: .7;
  margin-bottom: 36px;
}
.venue-details {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}
.venue-tip-item {
  grid-column: 1 / -1;
}
.venue-detail-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 15px;
  opacity: .96;
}
.venue-detail-item svg {
  flex-shrink: 0;
  opacity: .9;
}
.venue-detail-card {
  padding: 20px 18px;
  border-radius: 16px;
  border: 1px solid rgba(157,208,255,.34);
  background: linear-gradient(155deg, rgba(255,255,255,.18) 0%, rgba(255,255,255,.07) 100%);
  box-shadow: 0 12px 28px rgba(6,18,37,.22);
  backdrop-filter: blur(8px);
  transition: transform .35s ease, box-shadow .35s ease, border-color .35s ease;
}
.venue-detail-card:hover {
  transform: translateY(-4px);
  border-color: rgba(182,223,255,.72);
  box-shadow: 0 18px 36px rgba(6,18,37,.32);
}
.venue-detail-main h4 {
  margin: 1px 0 10px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .2px;
  color: #ffffff;
}
.venue-detail-main p {
  margin: 0 0 6px;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(244,249,255,.9);
}
.venue-detail-main p:last-child {
  margin-bottom: 0;
}
.venue-detail-main strong {
  color: rgba(187,227,255,.96);
  font-weight: 600;
}
.venue-tip-item {
  grid-column: 1 / -1;
  border: 1px dashed rgba(160,209,255,.46);
  border-radius: 14px;
  padding: 14px 16px;
  background: rgba(255,255,255,.06);
}
.venue-tip-item span {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(236,246,255,.86);
}

/* ============================================
   SECTION: NEWS
   ============================================ */
.section-news {
  padding: 120px 0;
  background: var(--white);
}
.news-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}
.news-headline { position: relative; }
.news-headline-img {
  width: 100%;
  height: 360px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
}
.news-headline-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .6s;
}
.news-headline:hover .news-headline-img img { transform: scale(1.05); }
.news-headline-body { padding: 30px 0 0; }
.news-headline-body h3 {
  font-size: 24px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.news-headline-body h3 a:hover { color: var(--brand); }
.news-headline-body p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-secondary);
}
.news-date-tag {
  display: inline-block;
  font-size: 13px;
  color: var(--brand);
  font-weight: 600;
  margin-bottom: 10px;
}

/* News list */
.news-list-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--brand);
}
.news-list-header h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--brand);
}
.news-list-item {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid #eee;
  transition: var(--transition);
}
.news-list-item:hover { padding-left: 10px; }
.news-list-item:hover .news-item-title { color: var(--brand); }
.news-list-date {
  flex-shrink: 0;
  width: 72px;
  height: 72px;
  background: var(--bg-light);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.news-list-item:hover .news-list-date { background: var(--brand); }
.news-list-item:hover .news-list-date .day,
.news-list-item:hover .news-list-date .month { color: var(--white); }
.news-list-date .day {
  font-size: 24px;
  font-weight: 700;
  color: var(--brand);
  line-height: 1.2;
}
.news-list-date .month {
  font-size: 12px;
  color: var(--text-light);
}
.news-item-title {
  font-size: 16px;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.6;
  transition: var(--transition);
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

/* Search bar */
.news-search {
  display: flex;
  align-items: center;
  margin-bottom: 30px;
  position: relative;
}
.news-search input {
  width: 100%;
  height: 48px;
  padding: 0 50px 0 20px;
  border: 2px solid #e0e0e0;
  border-radius: var(--radius);
  font-size: 14px;
  outline: none;
  transition: border-color .3s;
  font-family: inherit;
}
.news-search input:focus { border-color: var(--brand); }
.news-search input::placeholder { color: #bbb; }
.news-search button {
  position: absolute;
  right: 4px;
  top: 4px;
  width: 40px;
  height: 40px;
  border: none;
  background: var(--brand);
  color: var(--white);
  border-radius: 8px;
  cursor: pointer;
  font-size: 18px;
  transition: var(--transition);
}
.news-search button svg { display: block; margin: 0 auto; }
.news-search button:hover { background: var(--brand-dark); }

/* ============================================
   SECTION: VIDEO
   ============================================ */
.section-video {
  padding: 120px 0;
  background: var(--bg-light);
}
.video-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-top: 50px;
}
.video-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}
.video-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.video-card-thumb {
  position: relative;
  width: 100%;
  height: 200px;
  overflow: hidden;
  background: #ddd;
}
.video-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,.3);
  opacity: 0;
  transition: opacity .3s;
}
.video-card:hover .video-play-btn { opacity: 1; }
.video-play-btn::after {
  content: '';
  width: 56px;
  height: 56px;
  background: rgba(255,255,255,.95);
  border-radius: 50%;
}
.video-play-btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 1;
  width: 0; height: 0;
  margin: -10px 0 0 -6px;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent var(--brand);
}
.video-card-body { padding: 20px 24px; }
.video-card-body h4 {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--text-primary);
  margin-bottom: 8px;
  min-height: 48px;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.video-card-body .date {
  font-size: 13px;
  color: var(--text-light);
}

/* ============================================
   SECTION: INTRO + PROJECTS (WYSS Section2 Style)
   ============================================ */
.section-intro {
  min-height: 850px;
  padding: 160px 0 120px;
  background: var(--white);
  display: flex;
  align-items: center;
}
.intro-content {
  color: var(--text-primary);
  width: 65%;
  max-width: 900px;
  padding: 0 80px 0 0;
  font-size: 18px;
  line-height: 2;
  text-align: justify;
  margin-bottom: 80px;
}
.intro-content p { margin-bottom: 28px; }
.project-num-grid {
  display: flex;
  gap: 0;
  padding: 0 0 0 60px;
  overflow: hidden;
}
.project-num-item {
  flex: 1;
  color: var(--brand);
  margin: 0 4% 0 0;
  transition: var(--transition);
}
.project-num-item:last-child { margin-right: 0; }
.project-num-box {
  overflow: hidden;
}
.project-num-box .big-num {
  display: block;
  float: left;
  width: 65px;
  font-size: 100px;
  line-height: 110px;
  font-weight: 200;
  text-align: right;
  color: var(--brand);
}
.project-num-box p {
  float: left;
  width: calc(100% - 95px);
  font-size: 28px;
  line-height: 38px;
  padding: 0 0 0 20px;
  font-weight: 700;
  margin-top: 10px;
  color: var(--text-primary);
}
.project-num-item:hover .big-num { color: var(--brand-dark); }
.project-num-item:hover p { color: var(--brand); }

/* ============================================
   SECTION: MEETINGS (WYSS Section5/7 Style - Immersive Dark)
   ============================================ */
.section-meetings {
  min-height: 880px;
  padding: 120px 0;
  background: linear-gradient(135deg, var(--bg-dark) 0%, #0d2845 100%);
  color: var(--white);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
}
/* Simulated photographic texture via radial gradients */
.section-meetings::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(32,117,210,.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 30%, rgba(32,117,210,.08) 0%, transparent 40%),
    radial-gradient(ellipse at 60% 80%, rgba(10,22,40,.4) 0%, transparent 50%);
  z-index: 0;
}
.section-meetings > .wrapper { position: relative; z-index: 1; }
.section-meetings .section-title { color: var(--white); }
.meetings-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  margin-top: 50px;
  align-items: center;
}
.meetings-gallery {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.meeting-photo {
  border-radius: var(--radius);
  overflow: hidden;
  height: 200px;
  position: relative;
}
.meeting-photo:first-child { grid-row: span 2; height: 100%; }
.meeting-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .6s;
}
.meeting-photo:hover img { transform: scale(1.1); }
.meeting-photo-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 12px 16px;
  background: linear-gradient(transparent, rgba(0,0,0,.7));
  color: var(--white);
  font-size: 13px;
}
.meetings-timeline { padding-left: 40px; border-left: 2px solid rgba(255,255,255,.15); }
.timeline-item {
  position: relative;
  padding: 0 0 40px 30px;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -41px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--brand);
  border: 3px solid var(--bg-dark);
  border-radius: 50%;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-year {
  font-size: 14px;
  font-weight: 700;
  color: var(--brand);
  letter-spacing: 1px;
  margin-bottom: 6px;
}
.timeline-title {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 4px;
}
.timeline-desc {
  font-size: 14px;
  color: rgba(255,255,255,.6);
  line-height: 1.6;
}

/* ============================================
   SECTION: NEWSLETTER
   ============================================ */
.section-newsletter {
  padding: 100px 0;
  background: var(--white);
}
.newsletter-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 50px;
}
.newsletter-card {
  background: var(--bg-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  border: 1px solid transparent;
}
.newsletter-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: var(--brand);
}
.newsletter-card-thumb {
  height: 200px;
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-dark) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.newsletter-card-thumb .issue-label {
  color: var(--white);
  font-size: 20px;
  font-weight: 700;
  text-align: center;
  line-height: 1.5;
}
.newsletter-card-thumb .pdf-icon {
  position: absolute;
  bottom: 12px;
  right: 12px;
  font-size: 13px;
  background: rgba(255,255,255,.2);
  padding: 4px 12px;
  border-radius: 16px;
  color: var(--white);
}
.newsletter-card-body { padding: 20px; }
.newsletter-card-body h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}
.newsletter-card-body .date {
  font-size: 13px;
  color: var(--text-light);
}

/* ============================================
   SECTION: RESOURCES
   ============================================ */
.section-resources {
  padding: 120px 0;
  background: var(--bg-light);
}
.resources-layout {
  display: grid;
  grid-template-columns: 2fr 3fr;
  gap: 60px;
  margin-top: 50px;
  align-items: start;
}
.resource-list { display: flex; flex-direction: column; gap: 16px; }
.resource-item {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 20px 24px;
  background: var(--white);
  border-radius: var(--radius);
  transition: var(--transition);
  border: 1px solid transparent;
}
.resource-item:hover { border-color: var(--brand); transform: translateX(6px); box-shadow: var(--shadow); }
.resource-icon {
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  background: var(--brand-light);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--brand);
}
.resource-item h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.resource-item p { font-size: 13px; color: var(--text-light); }
.resource-featured {
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-dark) 100%);
  border-radius: var(--radius-lg);
  padding: 50px 40px;
  color: var(--white);
}
.resource-featured h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
}
.resource-featured p {
  font-size: 15px;
  opacity: .85;
  line-height: 1.8;
  margin-bottom: 30px;
}

/* ============================================
   SECTION: PARTNERS
   ============================================ */
.section-partners {
  padding: 100px 0;
  background: var(--white);
}
.partners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
  margin-top: 50px;
}
.partner-item {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 90px;
  padding: 16px 20px;
  border: 1px solid #eee;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  text-align: center;
  transition: var(--transition);
  line-height: 1.4;
}
.partner-item:hover {
  border-color: var(--brand);
  color: var(--brand);
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,.65);
  padding: 70px 0 0;
  border-top: 1px solid rgba(32,117,210,.25);
  position: relative;
}
.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, rgba(32,117,210,.6) 50%, transparent 100%);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr) 1.2fr;
  gap: 40px;
  padding-bottom: 50px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.footer-brand .logo {
  color: var(--white);
  margin-bottom: 16px;
}
.footer-brand p {
  font-size: 13.5px;
  line-height: 1.85;
  max-width: 280px;
  color: rgba(255,255,255,.5);
}
.footer-col h5 {
  font-size: 14px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 18px;
  letter-spacing: .5px;
  text-transform: uppercase;
}
.footer-col a {
  display: block;
  font-size: 13.5px;
  padding: 5px 0;
  color: rgba(255,255,255,.48);
  transition: var(--transition);
}
.footer-col a:hover {
  color: rgba(255,255,255,.9);
  padding-left: 6px;
  opacity: 1;
}
.footer-contact p {
  font-size: 13.5px;
  line-height: 2;
}
.footer-contact a {
  color: #5da8f0;
  transition: color .2s;
}
.footer-contact a:hover { color: #88c3f7; opacity: 1; }
.footer-bottom {
  text-align: center;
  padding: 22px 0;
  font-size: 12.5px;
  color: rgba(255,255,255,.3);
}

/* ============================================
   SUBPAGE LAYOUT
   ============================================ */
.page-banner {
  height: 380px;
  background:
    radial-gradient(ellipse at 18% 50%, rgba(32,117,210,.24) 0%, transparent 52%),
    radial-gradient(ellipse at 78% 20%, rgba(32,117,210,.12) 0%, transparent 45%),
    linear-gradient(145deg, #050d1a 0%, #0a1e3a 35%, #0d3060 100%);
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}
.page-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 60%;
  height: 200%;
  background: radial-gradient(ellipse, rgba(32,117,210,.12) 0%, transparent 60%);
}
.page-banner::after {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='1' cy='1' r='1' fill='rgba(255,255,255,.04)'/%3E%3C/svg%3E");
  pointer-events: none;
}
.page-banner-content {
  position: relative;
  z-index: 2;
  color: var(--white);
}
.page-banner h1 {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 800;
}
.breadcrumb {
  display: flex;
  gap: 8px;
  align-items: center;
  font-size: 14px;
  color: rgba(255,255,255,.6);
  margin-top: 16px;
}
.breadcrumb a { color: rgba(255,255,255,.6); }
.breadcrumb a:hover { color: var(--white); }
.breadcrumb .sep { font-size: 12px; }

.page-body {
  padding: 60px 0 100px;
}
.page-content-grid {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 50px;
}
.page-main { min-width: 0; }
.page-sidebar { position: sticky; top: 100px; }

/* Sidebar nav */
.sidebar-nav {
  background: linear-gradient(160deg, #f8fbff 0%, #f2f7ff 100%);
  border: 1px solid #dde8f5;
  border-radius: var(--radius-lg);
  padding: 26px;
  margin-bottom: 28px;
  box-shadow: var(--shadow-sm);
}
.sidebar-nav h4 {
  font-size: 15px;
  font-weight: 800;
  color: var(--brand);
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--brand-light);
  letter-spacing: .2px;
}
.sidebar-nav a {
  display: block;
  padding: 10px 14px;
  font-size: 13.5px;
  color: var(--text-secondary);
  border-radius: 8px;
  margin-bottom: 3px;
  transition: var(--transition);
  font-weight: 500;
}
.sidebar-nav a:hover {
  background: var(--brand-lighter);
  color: var(--brand);
  padding-left: 18px;
}
.sidebar-nav a.active {
  background: linear-gradient(90deg, var(--brand) 0%, #1a68c4 100%);
  color: var(--white);
  box-shadow: 0 4px 12px rgba(32,117,210,.22);
  padding-left: 14px;
}

/* Article list on subpage */
.article-list { display: flex; flex-direction: column; gap: 0; }
.article-item {
  display: flex;
  gap: 24px;
  padding: 26px 14px;
  border-bottom: 1px solid #edf2f8;
  transition: var(--transition);
  border-radius: var(--radius-lg);
  text-decoration: none;
}
.article-item:hover {
  padding-left: 20px;
  background: linear-gradient(90deg, #f0f6ff 0%, #f8fbff 60%, #fff 100%);
  box-shadow: 0 4px 20px rgba(32,117,210,.07);
  border-bottom-color: transparent;
  opacity: 1;
}
.article-thumb {
  flex-shrink: 0;
  width: 200px;
  height: 130px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #e8eff8;
}
.article-thumb img { width: 100%; height: 100%; object-fit: cover; }
.article-body { flex: 1; min-width: 0; }
.article-body h3 {
  font-size: 17.5px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text-primary);
  margin-bottom: 8px;
  transition: color .25s;
  letter-spacing: -.1px;
}
.article-item:hover .article-body h3 { color: var(--brand); }
.article-body p {
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.article-meta {
  font-size: 12.5px;
  color: var(--text-light);
  margin-top: 10px;
  font-weight: 500;
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-top: 50px;
}
.pagination a, .pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 12px;
  border: 1.5px solid #dde5f0;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
}
.pagination a:hover {
  background: var(--brand-lighter);
  color: var(--brand);
  border-color: rgba(32,117,210,.35);
  opacity: 1;
}
.pagination span.current {
  background: linear-gradient(135deg, #2075D2 0%, #1860b8 100%);
  color: var(--white);
  border-color: transparent;
  box-shadow: 0 4px 12px rgba(32,117,210,.28);
}

/* ============================================
   RESPONSIVE - TABLET
   ============================================ */
@media screen and (max-width: 1024px) {
  .news-grid { grid-template-columns: 1fr; gap: 40px; }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .meetings-layout { grid-template-columns: 1fr; gap: 40px; }
  .newsletter-grid { grid-template-columns: repeat(2, 1fr); }
  .resources-layout { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .page-content-grid { grid-template-columns: 1fr; }
  .page-sidebar { position: static; }

  /* Hero tablet */
  .hero-part2-grid { grid-template-columns: 1fr; gap: 50px; }
  .intro-content { width: 80%; }

  /* Schedule tablet */
  .schedule-item { grid-template-columns: 140px 1fr 120px; gap: 20px; }
  .schedule-tab { padding: 14px 28px; font-size: 15px; }

  /* Speakers tablet */
  .speakers-grid { grid-template-columns: repeat(3, 1fr); }

  /* Papers tablet */
  .registration-grid { grid-template-columns: 1fr; }
  .papers-split { grid-template-columns: 1fr; gap: 28px; }
  .papers-sidebar { position: static; }

  /* Project numbers tablet */
  .project-num-grid { padding: 0; }
  .project-num-box .big-num { font-size: 80px; line-height: 90px; }
  .project-num-box p { font-size: 22px; line-height: 32px; }

  .section-intro { min-height: auto; padding: 100px 0 80px; }
  .section-meetings { min-height: auto; }
  .section-schedule { min-height: auto; }
  .section-speakers { min-height: auto; }
  .section-papers { min-height: auto; }
}

/* ============================================
   RESPONSIVE - MOBILE
   ============================================ */
@media screen and (max-width: 768px) {
  .wrapper {
    width: 92%;
  }

  /* Header */
  .lang-divider { display: none; }
  .header-inner {
    height: 72px;
  }
  .logo {
    max-width: calc(100% - 52px);
  }
  .logo img {
    height: 50px;
    width: auto;
  }
  .logo-text span {
    font-size: 15px;
    line-height: 1.35;
    white-space: normal;
  }
  .logo-text small {
    font-size: 10px;
    letter-spacing: .6px;
  }
  .main-nav {
    position: fixed;
    top: 0; right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background: var(--white);
    flex-direction: column;
    align-items: flex-start;
    padding: 100px 30px 40px;
    gap: 0;
    box-shadow: var(--shadow-lg);
    transition: right .4s ease;
    z-index: 999;
  }
  .main-nav.open { right: 0; }
  .main-nav a {
    color: var(--text-primary);
    width: 100%;
    padding: 14px 16px;
    font-size: 16px;
    border-bottom: 1px solid #f0f0f0;
    border-radius: 0;
  }
  .main-nav a:hover,
  .main-nav a.active { background: var(--brand-light); color: var(--brand); }
  .lang-switch {
    margin: 20px 0 0;
    margin-left: 0;
    border-color: var(--brand);
    color: var(--brand);
  }
  .menu-toggle { display: flex; }
  .nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.5);
    z-index: 998;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
  }
  .nav-overlay.show { opacity: 1; visibility: visible; }

  /* Hero mobile */
  .hero-bg {
    background-image: url("https://hoohuiedu.hoohui.cn/%E7%A7%91%E7%B4%A0%E4%BC%9A/%E6%96%B0%E7%A7%BB%E5%8A%A8%E7%AB%AFkv.jpg");
    background-position: top center;
  }
  .hero-part1 { min-height: 600px; }
  .hero-part1-content { padding: 0 0 52px; }
  .hero-countdown-wrap {
    width: min(520px, 100%);
    padding: 0;
  }
  .hero-countdown-title { font-size: 19px; margin-bottom: 8px; }
  .hero-countdown-inline { gap: 8px; }
  .flip-clock-unit { gap: 4px; }
  .flip-value {
    min-width: 48px;
    font-size: clamp(26px, 8vw, 40px);
  }
  .flip-value-day { min-width: 64px; }
  .flip-unit-label { font-size: 16px; }
  .hero-part2 { min-height: auto; }
  .hero-part2-content { padding: 80px 0; }
  .hero-part2::after { height: 120px; }
  .section-seam {
    height: 78px;
    margin: -39px 0;
  }
  .hero-part2-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-actions {
    justify-content: flex-start;
    flex-direction: column;
    width: 100%;
  }
  .hero-actions .btn {
    width: 100%;
    justify-content: center;
  }
  .scroll-hint { display: none; }

  /* Schedule mobile */
  .section-schedule { padding: 60px 0; }
  .schedule-tabs {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    gap: 8px;
    padding-bottom: 8px;
    border-bottom: 1px solid #e5e7eb;
  }
  .schedule-tab {
    flex: 0 0 auto;
    padding: 10px 16px;
    font-size: 14px;
    white-space: nowrap;
    border-radius: 999px;
    border-bottom: none;
    margin-bottom: 0;
    background: #f3f6fb;
  }
  .schedule-tab.active {
    background: var(--brand);
    color: #fff;
  }
  .schedule-item {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 16px 0;
  }
  .schedule-time { margin-bottom: 4px; }
  .schedule-location { justify-self: start; }

  /* Speakers mobile */
  .section-speakers { padding: 60px 0; }
  .section-speakers::after { height: 130px; }
  .speakers-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 40px; }

  /* Papers mobile */
  .section-registration { padding: 60px 0; }
  .registration-card { padding: 20px; }
  .registration-card h3 { font-size: 18px; }
  .registration-card p,
  .registration-card li { font-size: 14px; line-height: 1.75; }
  .registration-form-wrap {
    padding: 18px;
  }
  .registration-form-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  .registration-actions {
    flex-direction: column;
  }
  .registration-actions .btn {
    width: 100%;
    justify-content: center;
  }

  .section-papers { padding: 60px 0; }
  .papers-split { grid-template-columns: 1fr; gap: 24px; }
  .papers-sidebar { position: static; }
  .papers-section-head { margin-bottom: 24px; padding-bottom: 6px; }
  .papers-journals { margin-top: 36px; padding-top: 28px; }
  .papers-info-item { align-items: flex-start; flex-wrap: wrap; }
  .papers-info-actions { width: 100%; padding-left: 64px; align-items: flex-start; }
  .papers-sidebar .papers-info-actions { padding-left: 0; }
  .papers-entry-submit { justify-content: flex-start; padding-left: 64px; padding-right: 0; }
  .papers-sidebar .papers-entry-submit { padding-left: 0; }
  .papers-download-btn,
  .papers-go-btn,
  .papers-submit-btn { margin-top: 2px; }
  .papers-flow {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    padding: 10px;
  }
  .papers-flow-item {
    justify-content: flex-start;
    padding: 0 12px;
  }
  .papers-journals h4 { font-size: 20px; }
  .papers-journals-lead { font-size: 14px; line-height: 1.8; }
  .journals-grid { grid-template-columns: 1fr; gap: 14px; }
  .journal-cover { height: 190px; }
  .journal-body { padding: 14px 14px 16px; }
  .journal-body h5 { font-size: 17px; margin-bottom: 8px; }
  .journal-body p { font-size: 13px; margin-bottom: 12px; }
  .journal-body a { min-height: 38px; padding: 8px 12px; }
  .papers-topics h4 { font-size: 21px; margin-bottom: 12px; }
  .topics-layout { grid-template-columns: 1fr; gap: 10px; }
  .topic-nav { display: none; }
  .topic-panel { display: block; border-radius: 12px; }
  .topic-mobile-trigger {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 11px 12px;
    border: 0;
    background: transparent;
    text-align: left;
    cursor: pointer;
  }
  .topic-mobile-trigger::after {
    content: '\25BC';
    margin-left: auto;
    font-size: 10px;
    color: #5f80a5;
    transition: transform .2s ease;
  }
  .topic-panel.active .topic-mobile-trigger::after {
    transform: rotate(180deg);
  }
  .topic-mobile-trigger .topic-num { width: 24px; height: 24px; font-size: 10px; }
  .topic-mobile-trigger .topic-text { font-size: 15px; line-height: 1.35; }
  .topic-panel-body { display: none; padding: 2px 13px 13px; }
  .topic-panel.active .topic-panel-body { display: block; }
  .topic-desc { font-size: 13px; line-height: 1.72; }
  .topic-subtitle { margin-top: 8px; font-size: 12px; }
  .topic-points { margin-top: 6px; gap: 4px; }
  .topic-points li { font-size: 12px; line-height: 1.68; }
  .papers-actions { flex-direction: column; }
  .papers-actions .btn { text-align: center; justify-content: center; }

  /* Venue mobile */
  .section-venue { padding: 60px 0; min-height: auto; }
  .venue-bg::after { height: 120px; }
  .section-venue > .wrapper { justify-content: flex-start; }
  .venue-content { max-width: 100%; }
  .venue-details { grid-template-columns: 1fr; }
  .venue-detail-card { padding: 16px 14px; border-radius: 14px; }
  .venue-detail-main h4 { font-size: 16px; margin-bottom: 8px; }
  .venue-detail-main p { font-size: 13px; line-height: 1.68; }
  .venue-tip-item { padding: 12px 13px; }
  .venue-tip-item span { font-size: 13px; }

  /* Sections mobile */
  .section-news,
  .section-video,
  .section-intro,
  .section-meetings,
  .section-newsletter,
  .section-resources,
  .section-partners { padding: 60px 0; min-height: auto; }

  .intro-content { width: 100%; padding: 0; font-size: 15px; margin-bottom: 40px; }

  /* Project numbers mobile - 2 columns wrap */
  .project-num-grid {
    flex-wrap: wrap;
    padding: 0;
  }
  .project-num-item {
    flex: 0 0 48%;
    margin: 0 4% 20px 0;
  }
  .project-num-item:nth-child(2n) { margin-right: 0; }
  .project-num-box .big-num { font-size: 64px; line-height: 74px; width: 50px; }
  .project-num-box p { font-size: 18px; line-height: 26px; width: calc(100% - 70px); padding-left: 12px; }

  .video-grid { grid-template-columns: 1fr; }
  .newsletter-grid { grid-template-columns: 1fr 1fr; }
  .partners-grid { grid-template-columns: repeat(2, 1fr); }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 28px 20px;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
  .footer-contact {
    grid-column: 1 / -1;
  }
  .footer-brand p { max-width: 100%; }

  /* Subpage */
  .page-banner { height: 260px; }
  .article-item { flex-direction: column; gap: 16px; }
  .article-thumb { width: 100%; height: 180px; }
  .news-headline-img { height: 220px; }

  .meetings-gallery { grid-template-columns: 1fr; }
  .meeting-photo:first-child { grid-row: span 1; height: 200px; }

  .section-title { margin-bottom: 12px; }
  .section-subtitle {
    font-size: 15px;
    line-height: 1.75;
  }
}

@media screen and (max-width: 480px) {
  .project-num-item { flex: 0 0 100%; margin-right: 0; }
  .newsletter-grid { grid-template-columns: 1fr; }
  .partners-grid { grid-template-columns: 1fr; }
  .btn { padding: 12px 24px; font-size: 14px; }
  .hero-part1-info { gap: 12px; }
  .speakers-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .topic-mobile-trigger .topic-text { font-size: 14px; }
  .time-start { font-size: 22px; }
}

/* ============================================
   UTILITY
   ============================================ */
.text-center { text-align: center; }
.text-brand { color: var(--brand); }
.mt-20 { margin-top: 20px; }
.mt-40 { margin-top: 40px; }
.mb-20 { margin-bottom: 20px; }
.mb-40 { margin-bottom: 40px; }
.hidden { display: none !important; }

/* Footer compact (homepage — 4 columns) */
.footer-grid-compact {
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
}

/* Hero Part2 left column: reveal animation uses full-width on single-col layout */
.hero-part2-left { min-width: 0; }


/* Better .time-start value color */
.time-start {
  font-size: 26px;
  font-weight: 300;
  color: var(--brand);
  letter-spacing: 1px;
}

/* Improved journal card */
.journal-card {
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.journal-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 32px rgba(16, 51, 92, .15);
  border-color: rgba(32,117,210,.25);
}

/* Papers info item hover */
.papers-info-item {
  transition: box-shadow .2s ease, border-color .2s ease;
}
.papers-info-item:hover {
  box-shadow: 0 4px 16px rgba(32,117,210,.08);
  border-color: rgba(32,117,210,.22);
}

/* Registration step card */
.registration-step {
  border-radius: var(--radius-lg);
  border: 1.5px solid #dbe7f6;
}
.registration-unlock-btn:not(:disabled):hover {
  transform: translateY(-1px);
}

/* Section header improved breadcrumb */
.breadcrumb {
  margin-top: 18px;
}

/* Better page banner h1 */
.page-banner-content h1 {
  font-size: clamp(28px, 4vw, 50px);
  font-weight: 800;
  letter-spacing: -.5px;
  line-height: 1.2;
}

/* Venue tag improved */
.venue-tag {
  font-weight: 600;
  letter-spacing: 2px;
}

/* Hero tag improved */
.hero-tag {
  font-weight: 600;
  letter-spacing: 2px;
}

/* Schedule section - white bg sections get a subtle top border */
.section-schedule {
  border-top: 1px solid #edf1f7;
}

/* Papers download button size */
.papers-deadline {
  font-size: 13.5px;
}

/* Registration consent text */
.registration-consent {
  font-size: 14px;
  line-height: 1.75;
}

/* Scrolled header height */
.site-header.scrolled .header-inner {
  height: 72px;
}

/* Header logo size in scrolled state */
.scrolled .logo img {
  height: 70px;
}

/* Mobile schedule tabs improvement */
@media screen and (max-width: 768px) {
  .schedule-tabs {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius-lg);
    flex-wrap: nowrap;
    padding: 4px;
  }
  .schedule-tab {
    flex: 0 0 auto;
    padding: 9px 20px;
    font-size: 14px;
    white-space: nowrap;
    border-radius: 10px;
    border-bottom: none;
    margin-bottom: 0;
    background: transparent;
  }
  .schedule-tab.active {
    background: linear-gradient(135deg, #2075D2 0%, #1860b8 100%);
    color: #fff;
  }
  .footer-grid-compact {
    grid-template-columns: 1fr 1fr;
    gap: 28px 20px;
  }
  .footer-grid-compact .footer-brand,
  .footer-grid-compact .footer-contact {
    grid-column: 1 / -1;
  }
}

/* ============================================
   FORM FEEDBACK & SUCCESS STATES
   ============================================ */

/* Field error state */
.registration-field.has-error input,
.registration-field.has-error textarea,
.registration-field.has-error select,
.registration-field.has-error .paper-file-input {
  border-color: #e11d48 !important;
  box-shadow: 0 0 0 3px rgba(225, 29, 72, .10) !important;
}

.field-error-msg {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: #e11d48;
  line-height: 1.4;
  margin-top: -2px;
}

/* Form banner (error / warning) */
.form-banner {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 13px 16px;
  border-radius: 10px;
  font-size: 14px;
  line-height: 1.55;
  margin-bottom: 18px;
  animation: bannerFadeIn .2s ease;
}

.form-banner--error {
  background: #fff5f7;
  border: 1.5px solid #fecdd3;
  color: #be123c;
}

.form-banner--warn {
  background: #fffbeb;
  border: 1.5px solid #fde68a;
  color: #92400e;
}

.form-banner__icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 1px;
}

.form-banner__text { flex: 1; }

.form-banner__close {
  flex-shrink: 0;
  background: none;
  border: none;
  cursor: pointer;
  color: inherit;
  opacity: 0.55;
  font-size: 20px;
  line-height: 1;
  padding: 0;
  margin-left: 4px;
  transition: opacity .15s;
}
.form-banner__close:hover { opacity: 1; }

@keyframes bannerFadeIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Shake animation for form */
@keyframes formShake {
  0%, 100% { transform: translateX(0); }
  20%       { transform: translateX(-7px); }
  40%       { transform: translateX(7px); }
  60%       { transform: translateX(-4px); }
  80%       { transform: translateX(4px); }
}
.form-shake { animation: formShake .42s ease; }

/* File selected chip */
.file-chosen-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
  padding: 8px 12px;
  background: #f0f7ff;
  border: 1.5px solid #bee3f8;
  border-radius: 8px;
  font-size: 13px;
  color: #1a4f7a;
  min-width: 0;
}
.file-chosen-row svg {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  color: var(--brand);
}
.file-chosen-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 600;
}
.file-chosen-size {
  flex-shrink: 0;
  color: #4a7ba7;
  font-size: 11px;
}

/* Upload progress bar */
.upload-progress-wrap {
  margin-top: 14px;
}
.upload-progress-label {
  display: block;
  font-size: 13px;
  color: var(--brand);
  font-weight: 500;
  margin-bottom: 6px;
}
.upload-progress-track {
  height: 6px;
  background: #e2eef9;
  border-radius: 4px;
  overflow: hidden;
}
.upload-progress-bar {
  height: 100%;
  background: var(--brand);
  border-radius: 4px;
  width: 0%;
  transition: width .25s ease;
}
.upload-progress-bar.indeterminate {
  width: 40%;
  animation: progressIndeterminate 1.4s ease infinite;
}
@keyframes progressIndeterminate {
  0%   { transform: translateX(-100%); width: 40%; }
  50%  { width: 60%; }
  100% { transform: translateX(300%); width: 40%; }
}

/* Success card */
.submit-success-card {
  text-align: center;
  padding: 64px 24px 48px;
}
.success-icon-wrap {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: #f0fdf4;
  border: 2px solid #bbf7d0;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
}
.success-icon-wrap svg {
  width: 36px;
  height: 36px;
  color: #059669;
  stroke-width: 2.5;
}
.success-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  letter-spacing: -0.3px;
}
.success-desc {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.75;
  max-width: 460px;
  margin: 0 auto 32px;
}
.success-desc strong {
  color: var(--text-primary);
}