/* ==========================================================
   [XX学院] 学术报告会 · 单页模板
   配色：学术深蓝 + 古铜金 · 与数学竞赛站群同源风格
   ========================================================== */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue:        #1e3a5f;
  --blue-dark:   #0c1f3a;
  --blue-mid:    #2d5184;
  --blue-light:  #e8eef7;
  --gold:        #b8862e;
  --gold-dark:   #8a6420;
  --gold-light:  #faf3e0;
  --green:       #2d8653;
  --green-light: #e8f5ee;
  --orange:      #c2500a;
  --purple:      #6741d9;
  --red:         #c0392b;
  --gray:        #f4f6f9;
  --gray-mid:    #d1d8e0;
  --text:        #1c2b3a;
  --text-muted:  #5a6a7a;
  --border:      #dde3eb;
  --white:       #ffffff;
  --shadow-sm:   0 1px 4px rgba(0,0,0,.08);
  --shadow-md:   0 4px 16px rgba(0,0,0,.10);
  --shadow-lg:   0 8px 32px rgba(0,0,0,.12);
  --radius:      10px;
  --radius-lg:   16px;
  --transition:  .2s ease;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.7;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

/* ===== 顶部机构条 ===== */
.org-bar {
  background: linear-gradient(90deg, #0c1f3a 0%, #1e3a5f 100%);
  color: rgba(255,255,255,.92);
  font-size: 12.5px;
  border-bottom: 1px solid rgba(184,134,46,.4);
}
.org-bar-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 38px; gap: 16px;
}
.org-bar-left, .org-bar-right { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.org-link, .org-ext-link {
  color: rgba(255,255,255,.92);
  display: inline-flex; align-items: center; gap: 6px;
  transition: var(--transition);
}
.org-link:hover, .org-ext-link:hover { color: var(--gold); text-decoration: none; }
.org-logo-sm { height: 20px; width: 20px; object-fit: contain; border-radius: 50%; background: #fff; padding: 1px; }
.org-sep { opacity: .35; padding: 0 4px; }

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px; gap: 24px;
}
.logo-area { display: flex; align-items: center; gap: 14px; flex-shrink: 0; }
.header-logo { height: 50px; width: auto; max-width: 280px; object-fit: contain; }
.logo-divider { width: 1px; height: 32px; background: var(--gray-mid); }
.logo-text { display: flex; flex-direction: column; line-height: 1.3; }
.logo-title { font-size: 16px; font-weight: 800; color: var(--blue-dark); letter-spacing: .3px; }
.logo-sub   { font-size: 12px; color: var(--gold-dark); letter-spacing: .8px; }

.main-nav { display: flex; gap: 2px; }
.main-nav a {
  padding: 8px 14px; border-radius: 6px;
  font-size: 14.5px; color: var(--text-muted); font-weight: 500;
  transition: var(--transition); white-space: nowrap;
}
.main-nav a:hover { background: var(--blue-light); color: var(--blue); text-decoration: none; }
.main-nav a.active {
  background: var(--blue); color: var(--white);
  font-weight: 600;
}
.main-nav a.active:hover { background: var(--blue-dark); color: var(--white); }

.nav-toggle {
  display: none; background: none; border: none;
  font-size: 22px; cursor: pointer; padding: 4px 8px;
  color: var(--text);
}

/* ===== Hero ===== */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, var(--blue-dark) 0%, var(--blue) 55%, var(--blue-mid) 100%);
  padding: 80px 0 70px;
  color: white;
}
.hero-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 80% 20%, rgba(184,134,46,.16) 0%, transparent 55%),
    radial-gradient(ellipse at 10% 80%, rgba(255,255,255,.05) 0%, transparent 50%),
    repeating-linear-gradient(45deg, transparent 0 18px, rgba(255,255,255,.02) 18px 19px);
  pointer-events: none;
}
.hero-content { position: relative; text-align: center; }

.hero-badge {
  display: inline-block;
  background: rgba(184,134,46,.18);
  border: 1px solid rgba(184,134,46,.55);
  color: #f1d68a;
  border-radius: 20px;
  padding: 5px 18px; font-size: 13px; font-weight: 600;
  margin-bottom: 22px; letter-spacing: 1px;
}

.hero-title {
  font-size: clamp(24px, 4vw, 38px);
  font-weight: 800; line-height: 1.3;
  margin-bottom: 14px;
  text-shadow: 0 2px 12px rgba(0,0,0,.25);
  max-width: 920px; margin-left: auto; margin-right: auto;
}
.hero-subtitle {
  font-size: 17px; opacity: .92;
  margin-bottom: 36px; font-weight: 400;
}

.hero-meta {
  display: flex; justify-content: center; align-items: center;
  gap: 0; flex-wrap: nowrap;
  background: rgba(255,255,255,.08);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: var(--radius-lg);
  padding: 20px 28px; margin: 0 auto 36px;
  max-width: 920px;
}
.meta-item {
  display: flex; align-items: center; gap: 12px;
  padding: 0 22px; flex: 1 1 auto; text-align: left;
}
.meta-icon { font-size: 28px; }
.meta-label { font-size: 12px; opacity: .75; margin-bottom: 2px; }
.meta-value { font-size: 14.5px; font-weight: 600; line-height: 1.4; }
.meta-divider { width: 1px; height: 56px; background: rgba(255,255,255,.22); }

.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 12px 28px; border-radius: 8px;
  font-size: 15px; font-weight: 600;
  cursor: pointer; border: 2px solid transparent;
  transition: var(--transition);
  text-decoration: none !important;
}
.btn-primary {
  background: var(--gold); color: var(--blue-dark);
  border-color: var(--gold);
  box-shadow: 0 4px 14px rgba(184,134,46,.3);
}
.btn-primary:hover { background: #c9982f; transform: translateY(-1px); box-shadow: 0 6px 20px rgba(184,134,46,.4); }
.btn-outline {
  background: transparent; color: white;
  border-color: rgba(255,255,255,.55);
}
.btn-outline:hover { background: rgba(255,255,255,.13); transform: translateY(-1px); }
.btn-sm { padding: 8px 18px; font-size: 13px; }

/* ===== 倒计时 ===== */
.countdown-bar {
  background: linear-gradient(90deg, var(--gold) 0%, #d2a042 100%);
  color: var(--blue-dark);
  border-bottom: 1px solid rgba(0,0,0,.05);
}
.countdown-inner {
  text-align: center; padding: 12px 0;
  font-size: 15px; font-weight: 700; letter-spacing: .5px;
}
.countdown-inner b {
  display: inline-block; padding: 2px 10px; margin: 0 4px;
  background: var(--blue-dark); color: var(--gold-light);
  border-radius: 6px; font-variant-numeric: tabular-nums;
  min-width: 38px;
}

/* ===== 公告栏 ===== */
.notice-bar {
  background: linear-gradient(90deg, #1a3a6b 0%, var(--blue) 100%);
  border-bottom: 3px solid var(--gold);
}
.notice-inner {
  display: flex; align-items: stretch; min-height: 50px;
}
.notice-tag {
  background: var(--gold); color: var(--blue-dark);
  padding: 0 22px 0 16px;
  font-size: 13px; font-weight: 800;
  display: flex; align-items: center;
  letter-spacing: .8px;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 50%, calc(100% - 12px) 100%, 0 100%);
}
.notice-scroll {
  flex: 1; padding: 12px 24px;
  color: rgba(255,255,255,.95); font-size: 14px;
  overflow: hidden;
}
.notice-scroll a { color: var(--gold-light); }

/* ===== 通用 section ===== */
.section { padding: 72px 0; }
.section-gray { background: var(--gray); }
.section-title {
  text-align: center;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800; color: var(--blue-dark);
  margin-bottom: 14px;
  position: relative;
}
.section-title::after {
  content: ""; display: block;
  width: 60px; height: 3px;
  background: linear-gradient(90deg, var(--gold), var(--blue));
  margin: 14px auto 0; border-radius: 2px;
}
.section-desc {
  text-align: center; color: var(--text-muted);
  max-width: 760px; margin: 0 auto 44px;
  font-size: 15.5px;
}

/* ===== 卡片网格 ===== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 22px;
}
.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 22px;
  text-align: center;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--gold); }
.card-icon { font-size: 34px; margin-bottom: 12px; }
.card h3 { font-size: 16px; color: var(--blue-dark); margin-bottom: 8px; }
.card p { font-size: 14px; color: var(--text-muted); }

/* ===== 报告人卡片 ===== */
.speaker-card {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 36px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}
.speaker-card::before {
  content: ""; position: absolute; top: 0; left: 0;
  width: 100%; height: 5px;
  background: linear-gradient(90deg, var(--blue) 0%, var(--gold) 100%);
}
.speaker-photo-wrap {
  display: flex; flex-direction: column; align-items: center; gap: 16px;
}
.speaker-photo {
  width: 220px; height: 220px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--white);
  box-shadow: 0 8px 24px rgba(30,58,95,.2);
  background: var(--gray);
}
.speaker-name-tag {
  text-align: center;
  background: var(--blue-light);
  border: 1px solid rgba(30,58,95,.2);
  border-radius: var(--radius);
  padding: 12px 18px;
  width: 100%;
}
.sp-name {
  display: block; font-size: 18px; font-weight: 800;
  color: var(--blue-dark); margin-bottom: 2px;
}
.sp-title { font-size: 13px; color: var(--gold-dark); font-weight: 600; }

.speaker-info { padding-top: 6px; }
.speaker-headline {
  font-size: 22px; color: var(--blue-dark);
  margin-bottom: 4px; font-weight: 800;
}
.speaker-affil {
  color: var(--text-muted); font-size: 14.5px; margin-bottom: 18px;
}
.speaker-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.sp-tag {
  background: var(--gold-light); color: var(--gold-dark);
  border: 1px solid rgba(184,134,46,.4);
  padding: 4px 12px; border-radius: 14px;
  font-size: 12.5px; font-weight: 600;
}
.sp-sub {
  font-size: 15px; color: var(--blue-dark);
  margin: 18px 0 8px; font-weight: 700;
  padding-left: 10px; border-left: 3px solid var(--gold);
}
.sp-list { padding-left: 18px; }
.sp-list li {
  list-style: disc; color: var(--text);
  font-size: 14.5px; margin-bottom: 4px;
}

/* ===== 报告内容（abstract） ===== */
.abstract-block {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  max-width: 920px; margin: 0 auto;
}
.abstract-header {
  background: linear-gradient(135deg, var(--blue-dark), var(--blue));
  color: white;
  padding: 26px 32px;
}
.ab-label {
  display: inline-block;
  background: var(--gold); color: var(--blue-dark);
  padding: 3px 12px; border-radius: 12px;
  font-size: 12px; font-weight: 700; letter-spacing: .8px;
  margin-bottom: 12px;
}
.ab-title {
  font-size: 22px; line-height: 1.45; font-weight: 800;
}
.abstract-body { padding: 28px 32px; }
.abstract-body p { font-size: 15px; color: var(--text); margin-bottom: 14px; text-align: justify; }
.ab-sub {
  font-size: 15px; color: var(--blue-dark);
  margin: 22px 0 10px; font-weight: 700;
}
.keyword-list { display: flex; flex-wrap: wrap; gap: 8px; }
.kw {
  background: var(--blue-light); color: var(--blue-dark);
  border: 1px solid rgba(30,58,95,.2);
  padding: 5px 14px; border-radius: 14px;
  font-size: 13px; font-weight: 500;
}

/* ===== 时间线 ===== */
.timeline {
  position: relative; max-width: 800px; margin: 0 auto;
  padding-left: 30px;
}
.timeline::before {
  content: ""; position: absolute;
  left: 8px; top: 8px; bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--blue), var(--gold), var(--green));
}
.timeline-item { position: relative; padding-bottom: 28px; }
.timeline-dot {
  position: absolute;
  left: -28px; top: 6px;
  width: 16px; height: 16px;
  border-radius: 50%;
  border: 3px solid var(--white);
  box-shadow: 0 0 0 2px var(--blue);
  background: var(--blue);
}
.timeline-dot.dot-blue   { background: var(--blue);   box-shadow: 0 0 0 2px var(--blue); }
.timeline-dot.dot-gold   { background: var(--gold);   box-shadow: 0 0 0 2px var(--gold); }
.timeline-dot.dot-purple { background: var(--purple); box-shadow: 0 0 0 2px var(--purple); }
.timeline-dot.dot-green  { background: var(--green);  box-shadow: 0 0 0 2px var(--green); }
.timeline-content {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 22px;
  box-shadow: var(--shadow-sm);
}
.timeline-date {
  font-size: 13px; color: var(--gold-dark);
  font-weight: 700; letter-spacing: .5px;
  margin-bottom: 4px;
}
.timeline-event {
  font-size: 16px; font-weight: 700; color: var(--blue-dark);
  margin-bottom: 6px;
}
.timeline-desc { font-size: 14px; color: var(--text-muted); }

/* ===== 会议地点 ===== */
.venue-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 32px;
  align-items: stretch;
}
.venue-info {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 30px;
  box-shadow: var(--shadow-sm);
}
.venue-info h3 {
  font-size: 19px; color: var(--blue-dark); font-weight: 800;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--gold);
  line-height: 1.45;
  word-break: break-word;
}
.venue-info h3 small {
  display: block;
  font-size: 13.5px;
  color: var(--text-muted);
  font-weight: 500;
  margin-top: 4px;
  letter-spacing: 0;
}

.venue-rows { display: flex; flex-direction: column; margin-bottom: 22px; }
.vr-row {
  display: block;
  padding: 12px 0;
  border-top: 1px solid var(--border);
}
.vr-row:first-child { padding-top: 4px; border-top: none; }
.vr-row:last-child { padding-bottom: 4px; }
.vr-label {
  display: block;
  color: var(--gold-dark);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  margin-bottom: 5px;
}
.vr-value {
  display: block;
  color: var(--text);
  font-size: 14.5px;
  line-height: 1.65;
  word-break: break-word;
}
.vr-value a { word-break: break-all; }

.venue-map {
  display: flex; flex-direction: column;
  gap: 12px;
}
.amap-canvas {
  position: relative;
  min-height: 340px;
  background: linear-gradient(135deg, var(--blue-light), var(--white));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.amap-canvas .amap-fallback {
  position: absolute; inset: 0;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  text-align: center;
  padding: 24px;
}
.amap-fallback-pin {
  font-size: 56px;
  margin-bottom: 14px;
  filter: drop-shadow(0 4px 8px rgba(30,58,95,.25));
}
.amap-fallback-info strong {
  display: block;
  color: var(--blue-dark);
  font-size: 17px;
  font-weight: 800;
  margin-bottom: 8px;
}
.amap-fallback-info small {
  display: block;
  color: var(--text-muted);
  font-size: 12.5px;
  margin-top: 4px;
}
.amap-fallback-info .amap-coords {
  margin-top: 10px;
  padding: 4px 10px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  font-family: 'Consolas', 'Courier New', monospace;
  font-size: 11.5px;
  color: var(--blue);
  display: inline-block;
}

/* 高德按钮组 */
.amap-actions {
  display: flex; flex-wrap: wrap; gap: 10px;
}
.btn-amap {
  flex: 1 1 auto;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 16px;
  background: linear-gradient(135deg, #00a766, #008c52);
  color: #fff !important;
  border: 2px solid transparent;
  border-radius: 8px;
  font-size: 14px; font-weight: 700;
  text-decoration: none !important;
  letter-spacing: .5px;
  transition: var(--transition);
  box-shadow: 0 3px 10px rgba(0,140,82,.25);
}
.btn-amap:hover {
  transform: translateY(-1px);
  box-shadow: 0 5px 16px rgba(0,140,82,.35);
  background: linear-gradient(135deg, #00b772, #009659);
}
.btn-amap-icon { font-size: 18px; }
.btn-amap-outline {
  background: var(--white);
  color: #00875a !important;
  border-color: #00a766;
  box-shadow: none;
}
.btn-amap-outline:hover {
  background: #ecfaf3;
  color: #00754a !important;
  box-shadow: 0 3px 10px rgba(0,140,82,.15);
}

/* ===== 参会指南 步骤卡 ===== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-bottom: 28px;
}
.step-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 22px;
  position: relative;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}
.step-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--blue); }
.step-num {
  display: inline-block;
  background: linear-gradient(135deg, var(--blue), var(--blue-dark));
  color: var(--gold-light);
  font-family: serif;
  font-size: 22px; font-weight: 800;
  padding: 4px 14px; border-radius: 6px;
  margin-bottom: 12px;
  box-shadow: 0 2px 8px rgba(30,58,95,.25);
}
.step-card h3 { font-size: 16px; color: var(--blue-dark); margin-bottom: 8px; }
.step-card p { font-size: 14px; color: var(--text-muted); }

/* ===== 提示框 ===== */
.tip-box {
  display: flex; align-items: flex-start; gap: 12px;
  background: var(--blue-light);
  border-left: 4px solid var(--blue);
  border-radius: 6px;
  padding: 14px 18px;
  margin-top: 22px;
  font-size: 14.5px; color: var(--text);
}
.tip-icon { font-size: 20px; flex-shrink: 0; }
.tip-box.tip-gold {
  background: var(--gold-light);
  border-left-color: var(--gold);
}
.tip-box.tip-red {
  background: #fdecea;
  border-left-color: var(--red);
}

/* ===== 主办承办单位 ===== */
.org-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 28px;
}
.org-card-wide {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  display: flex; flex-direction: column;
}
.org-card-header {
  height: 130px;
  display: flex; align-items: center; justify-content: center;
  background: var(--gray);
  border-bottom: 3px solid var(--gold);
}
.host-header { background: linear-gradient(135deg, var(--blue-light), var(--white)); }
.undertake-header { background: linear-gradient(135deg, var(--gold-light), var(--white)); }
.org-card-logo { max-height: 90px; max-width: 88%; object-fit: contain; }
.org-card-body { padding: 22px 26px; }
.org-role-tag {
  display: inline-block;
  background: var(--blue); color: white;
  padding: 3px 12px; border-radius: 12px;
  font-size: 12px; font-weight: 700; letter-spacing: .5px;
  margin-bottom: 10px;
}
.org-role-tag.undertake { background: var(--gold); color: var(--blue-dark); }
.org-card-body h3 { font-size: 18px; color: var(--blue-dark); margin-bottom: 10px; }
.org-intro { color: var(--text-muted); font-size: 14px; margin-bottom: 14px; }
.org-meta-list { font-size: 13.5px; color: var(--text); }
.org-meta-list > div { margin-bottom: 4px; }

/* ===== 联系我们 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}
.contact-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 22px;
  text-align: center;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}
.contact-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--gold); }
.ct-icon { font-size: 36px; margin-bottom: 10px; }
.contact-card h3 { font-size: 17px; color: var(--blue-dark); margin-bottom: 14px; }
.ct-rows { font-size: 14px; color: var(--text); line-height: 2; text-align: left; padding: 0 8px; }
.ct-rows a { color: var(--blue); }

/* ===== 页脚 ===== */
.site-footer {
  background: var(--blue-dark);
  color: rgba(255,255,255,.85);
  padding: 50px 0 0;
  margin-top: 0;
}
.footer-inner { display: flex; flex-direction: column; gap: 28px; align-items: center; }
.footer-orgs {
  display: flex; align-items: center; gap: 32px;
  padding: 20px 28px;
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(184,134,46,.25);
  border-radius: var(--radius);
}
.footer-org-block { text-align: center; }
.footer-org-role { font-size: 11px; color: var(--gold); letter-spacing: 2px; margin-bottom: 8px; }
.footer-org-logo-wrap {
  display: inline-block;
  background: var(--white);
  border-radius: 8px;
  padding: 8px 14px;
}
.footer-org-img { height: 52px; width: auto; max-width: 260px; object-fit: contain; }
.footer-org-name { font-size: 13px; margin-top: 8px; opacity: .85; }
.footer-org-sep-v { width: 1px; height: 80px; background: rgba(255,255,255,.18); }

.footer-info { text-align: center; font-size: 14px; line-height: 2; opacity: .85; }
.footer-info a { color: rgba(255,255,255,.85); }

.footer-links {
  display: flex; flex-wrap: wrap; gap: 18px; justify-content: center;
  padding: 16px 0; border-top: 1px solid rgba(255,255,255,.1);
  border-bottom: 1px solid rgba(255,255,255,.1);
  width: 100%;
}
.footer-links a { color: rgba(255,255,255,.75); font-size: 13.5px; }
.footer-links a:hover { color: var(--gold); text-decoration: none; }

.footer-bottom { padding: 16px 0 22px; }
.footer-bottom p {
  text-align: center; font-size: 12.5px;
  color: rgba(255,255,255,.5);
}
.footer-bottom a { color: rgba(255,255,255,.7); }

/* ==========================================================
   ↓↓↓ 国际会议专用扩展样式（双语标题 / Chairs / Speakers / Topics / Travel / Confirm / 组委会）
   ========================================================== */

/* ----- 双语 section 标题 ----- */
.section-title .title-en,
.section-title .title-zh { display: block; }
.section-title .title-en {
  font-size: clamp(22px, 3vw, 30px);
  color: var(--blue-dark);
  font-weight: 800;
}
.section-title .title-zh {
  font-size: 14px; font-weight: 500;
  color: var(--gold-dark);
  letter-spacing: 4px;
  margin-top: 6px;
}

/* ----- Hero 中文副标题 ----- */
.hero-title-zh {
  font-size: clamp(16px, 2.6vw, 22px);
  font-weight: 600;
  color: var(--gold-light);
  letter-spacing: 4px;
  margin-bottom: 18px;
}
.hero-subtitle small {
  display: block; margin-top: 6px;
  font-size: 13px; opacity: .8; letter-spacing: 2px;
}

/* ----- Chairs 双卡片 ----- */
.chair-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(420px, 1fr));
  gap: 28px;
}
.chair-card {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 26px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}
.chair-card::before {
  content: ""; position: absolute; top: 0; left: 0;
  width: 100%; height: 4px;
  background: linear-gradient(90deg, var(--blue), var(--gold));
}
.chair-photo-wrap {
  display: flex; flex-direction: column; align-items: center; gap: 12px;
}
.chair-photo {
  width: 180px; height: 180px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--white);
  box-shadow: 0 6px 20px rgba(30,58,95,.18);
  background: var(--gray);
}
.chair-role-badge {
  background: var(--blue); color: var(--gold-light);
  padding: 5px 14px; border-radius: 14px;
  font-size: 11.5px; font-weight: 700;
  letter-spacing: .5px; text-align: center;
  white-space: nowrap;
}
.chair-role-badge.alt { background: var(--gold); color: var(--blue-dark); }

.chair-info { padding-top: 4px; }
.chair-name {
  font-size: 20px; color: var(--blue-dark);
  font-weight: 800; margin-bottom: 4px;
}
.chair-affil {
  color: var(--text-muted); font-size: 14px;
  margin-bottom: 14px; line-height: 1.5;
}
.chair-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.chair-bio {
  font-size: 14px; color: var(--text); line-height: 1.7;
  text-align: justify;
}
.chair-bio em { color: var(--text-muted); font-size: 13px; }

.sp-tag {
  background: var(--blue-light); color: var(--blue-dark);
  border: 1px solid rgba(30,58,95,.25);
  padding: 3px 11px; border-radius: 12px;
  font-size: 12px; font-weight: 600;
}
.sp-tag.alt {
  background: var(--gold-light); color: var(--gold-dark);
  border-color: rgba(184,134,46,.4);
}

/* ----- Speakers 统计条 ----- */
.speakers-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0;
  background: linear-gradient(135deg, var(--blue-dark), var(--blue));
  border-radius: var(--radius-lg);
  padding: 22px;
  margin: 0 auto 36px;
  max-width: 920px;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}
.speakers-stats::before {
  content: ""; position: absolute; top: 0; right: 0;
  width: 200px; height: 200px;
  background: radial-gradient(circle, rgba(184,134,46,.18) 0%, transparent 70%);
  border-radius: 50%; transform: translate(40%, -40%);
}
.stat-block {
  text-align: center; color: white;
  padding: 6px 14px;
  border-right: 1px solid rgba(255,255,255,.15);
  position: relative;
}
.stat-block:last-child { border-right: none; }
.stat-num {
  display: block;
  font-size: 36px; font-weight: 800;
  color: var(--gold-light);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  letter-spacing: -.5px;
}
.stat-label {
  display: block;
  font-size: 12px; font-weight: 600;
  margin-top: 6px;
  opacity: .82;
  letter-spacing: 1.2px;
  text-transform: uppercase;
}

/* ----- Speakers 网格 ----- */
.speakers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 18px;
}
.speaker-tile {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
  display: flex; flex-direction: column;
}
.speaker-tile:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--gold);
}
.speaker-tile-photo-wrap {
  position: relative;
  aspect-ratio: 1 / 1;
  background: var(--gray);
  border-bottom: 1px solid var(--border);
}
.speaker-tile-photo {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
}
.speaker-flag {
  position: absolute;
  bottom: 8px; right: 8px;
  font-size: 22px;
  width: 30px; height: 30px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--white);
  border-radius: 50%;
  box-shadow: 0 2px 6px rgba(0,0,0,.15);
  line-height: 1;
}
.speaker-tile-info { padding: 14px 16px; flex: 1; display: flex; flex-direction: column; }
.speaker-tile-info h4 {
  font-size: 15px; color: var(--blue-dark);
  margin-bottom: 4px; font-weight: 700;
  line-height: 1.35;
  min-height: 40px;
}
.speaker-tile-info h4 a {
  color: inherit;
  border-bottom: 1px dotted transparent;
  transition: var(--transition);
}
.speaker-tile-info h4 a:hover {
  color: var(--blue);
  border-bottom-color: var(--blue);
  text-decoration: none;
}
.speaker-tile-info .aff {
  font-size: 12.5px; color: var(--text-muted);
  margin-bottom: 8px;
  line-height: 1.45;
}
/* ----- Topics 药丸 ----- */
.topics-grid {
  display: flex; flex-wrap: wrap; gap: 12px;
  justify-content: center;
  max-width: 920px; margin: 0 auto;
}
.topic-pill {
  background: var(--white);
  border: 1.5px solid var(--blue);
  color: var(--blue-dark);
  padding: 10px 22px; border-radius: 26px;
  font-size: 14.5px; font-weight: 600;
  transition: var(--transition);
  cursor: default;
}
.topic-pill:hover {
  background: var(--blue);
  color: white;
  border-color: var(--blue);
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(30,58,95,.25);
}
.topic-pill:nth-child(3n) { border-color: var(--gold); color: var(--gold-dark); }
.topic-pill:nth-child(3n):hover { background: var(--gold); color: var(--blue-dark); }

/* ----- Travel & Accommodation 网格 ----- */
.travel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 22px;
}
.travel-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-left: 4px solid var(--gold);
  border-radius: var(--radius);
  padding: 24px 22px;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}
.travel-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-left-color: var(--blue);
}
.travel-icon { font-size: 32px; margin-bottom: 10px; }
.travel-card h3 {
  font-size: 16px; color: var(--blue-dark);
  margin-bottom: 8px; font-weight: 700;
}
.travel-card p { font-size: 14px; color: var(--text); line-height: 1.7; }

/* ----- Confirmation 大卡 ----- */
.confirm-card {
  display: flex; flex-wrap: wrap; align-items: center;
  justify-content: space-between; gap: 24px;
  background: linear-gradient(135deg, var(--blue-dark), var(--blue));
  color: white;
  border-radius: var(--radius-lg);
  padding: 28px 36px;
  margin-bottom: 36px;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}
.confirm-card::before {
  content: ""; position: absolute; top: 0; right: 0;
  width: 240px; height: 240px;
  background: radial-gradient(circle, rgba(184,134,46,.18) 0%, transparent 70%);
  border-radius: 50%;
  transform: translate(40%, -40%);
}
.confirm-mail {
  display: flex; align-items: center; gap: 16px;
  position: relative;
}
.confirm-icon { font-size: 38px; }
.confirm-label {
  font-size: 12px; opacity: .75;
  letter-spacing: 2px; margin-bottom: 4px;
}
.confirm-addr {
  font-size: 22px; font-weight: 700;
  color: var(--gold-light);
  letter-spacing: .5px;
}
.confirm-addr:hover { color: white; text-decoration: none; }
.confirm-card .btn-primary { position: relative; }

.steps-compact { gap: 16px; }
.steps-compact .step-card { padding: 22px 20px; }

/* ----- 组委会成员 ----- */
.committee-list {
  margin-top: 40px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 30px;
  box-shadow: var(--shadow-sm);
}
.committee-list h3 {
  font-size: 17px; color: var(--blue-dark);
  margin-bottom: 18px; font-weight: 800;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--gold);
}
.committee-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}
.member {
  display: flex; flex-direction: column;
  padding: 10px 14px;
  background: var(--gray);
  border-left: 3px solid var(--blue);
  border-radius: 6px;
}
.member-name { font-size: 14.5px; font-weight: 700; color: var(--blue-dark); }
.member-role { font-size: 12.5px; color: var(--gold-dark); margin-top: 2px; }

/* ===== 响应式 ===== */
@media (max-width: 960px) {
  .speaker-card { grid-template-columns: 1fr; gap: 24px; padding: 26px; }
  .speaker-photo-wrap { max-width: 280px; margin: 0 auto; }
  .venue-grid { grid-template-columns: 1fr; gap: 20px; }
}

@media (max-width: 760px) {
  .container { padding: 0 18px; }
  .org-bar { font-size: 11.5px; }
  .org-bar-inner { height: auto; padding: 8px 0; flex-wrap: wrap; gap: 8px; }
  .org-bar-right { display: none; }

  .header-inner { height: 60px; }
  .logo-title { font-size: 14.5px; }
  .logo-sub   { font-size: 11px; }
  .main-nav {
    display: none;
    position: absolute; top: 60px; left: 0; right: 0;
    background: var(--white);
    flex-direction: column; gap: 0;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
  }
  .main-nav.open { display: flex; }
  .main-nav a {
    padding: 14px 22px; border-radius: 0;
    border-bottom: 1px solid var(--border);
  }
  .nav-toggle { display: block; }

  .hero { padding: 56px 0 50px; }
  .hero-meta {
    flex-direction: column; gap: 16px;
    padding: 18px 22px;
  }
  .meta-item { width: 100%; padding: 0; justify-content: flex-start; }
  .meta-divider { width: 100%; height: 1px; }

  .section { padding: 56px 0; }
  .section-title { font-size: 22px; }

  .speaker-card { padding: 22px; }
  .speaker-photo { width: 180px; height: 180px; }
  .abstract-header { padding: 22px; }
  .ab-title { font-size: 18px; }
  .abstract-body { padding: 22px; }

  .vr-label { font-size: 11.5px; letter-spacing: 1px; }
  .vr-value { font-size: 14px; }

  .footer-orgs { flex-direction: column; gap: 16px; padding: 20px; }
  .footer-org-sep-v { width: 80%; height: 1px; }

  /* 国际会议版块 */
  .chair-card { grid-template-columns: 1fr; padding: 22px; gap: 18px; }
  .chair-photo-wrap { max-width: 240px; margin: 0 auto; }
  .chair-photo { width: 160px; height: 160px; }
  .speakers-stats {
    grid-template-columns: repeat(2, 1fr);
    padding: 16px 12px; gap: 0;
  }
  .stat-block { border-right: none; border-bottom: 1px solid rgba(255,255,255,.12); padding: 10px; }
  .stat-block:nth-last-child(-n+2) { border-bottom: none; }
  .stat-block:nth-child(2n) { border-left: 1px solid rgba(255,255,255,.12); }
  .stat-num { font-size: 28px; }
  .stat-label { font-size: 10.5px; letter-spacing: .8px; }
  .speakers-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; }
  .speaker-tile-info { padding: 11px 13px; }
  .speaker-tile-info h4 { font-size: 13.5px; min-height: 36px; }
  .speaker-tile-info .aff { font-size: 11.5px; }
  .speaker-flag { width: 26px; height: 26px; font-size: 18px; bottom: 6px; right: 6px; }
  .topic-pill { padding: 8px 16px; font-size: 13.5px; }
  .confirm-card { flex-direction: column; align-items: stretch; padding: 24px; gap: 20px; }
  .confirm-mail { justify-content: flex-start; }
  .confirm-addr { font-size: 17px; }
  .committee-list { padding: 22px; }
}

/* ===== 小屏手机 (≤480px) ===== */
@media (max-width: 480px) {
  html { font-size: 15px; }
  .container { padding: 0 14px; }

  /* 顶部机构条 */
  .org-bar { font-size: 11px; }
  .org-bar-inner { padding: 6px 0; gap: 6px; }
  .org-bar-left { flex-wrap: wrap; line-height: 1.5; }
  .org-logo-sm { height: 18px; width: 18px; }

  /* 头部 */
  .header-inner { height: 58px; gap: 10px; }
  .header-logo { height: 36px; max-width: 200px; }
  .logo-divider { display: none; }
  .logo-title { font-size: 13px; max-width: 130px;
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .logo-sub { font-size: 10.5px; }
  .nav-toggle { font-size: 24px; padding: 4px 6px; }
  .main-nav { top: 58px; }
  .main-nav a { padding: 14px 18px; font-size: 14.5px; }

  /* Hero */
  .hero { padding: 40px 0 36px; }
  .hero-badge { font-size: 11px; padding: 3px 12px; margin-bottom: 14px; letter-spacing: .5px; }
  .hero-title { font-size: 21px; line-height: 1.35; padding: 0 4px; }
  .hero-title-zh { font-size: 14px; letter-spacing: 2px; margin-bottom: 12px; }
  .hero-subtitle { font-size: 13.5px; margin-bottom: 24px; padding: 0 4px; }
  .hero-subtitle small { font-size: 11px; letter-spacing: 1px; }
  .hero-meta { padding: 14px 16px; gap: 12px; margin-bottom: 24px; }
  .meta-item { gap: 10px; padding: 4px 0; }
  .meta-icon { font-size: 22px; }
  .meta-label { font-size: 11px; }
  .meta-value { font-size: 13px; line-height: 1.4; }
  .hero-actions { gap: 8px; }
  .hero-actions .btn { padding: 9px 14px; font-size: 13px; flex: 1 1 auto; min-width: 0; }

  /* 倒计时 */
  .countdown-inner { font-size: 12.5px; padding: 10px 0; line-height: 1.6; }
  .countdown-inner b { padding: 2px 6px; min-width: 26px; font-size: 12px; margin: 0 2px; }

  /* 公告 */
  .notice-tag { padding: 0 14px 0 8px; font-size: 11px; letter-spacing: .3px; }
  .notice-scroll { padding: 10px 14px; font-size: 12.5px; line-height: 1.6; }

  /* 通用 section */
  .section { padding: 40px 0; }
  .section-title .title-en { font-size: 21px; }
  .section-title .title-zh { font-size: 12px; letter-spacing: 2px; margin-top: 4px; }
  .section-desc { font-size: 13.5px; margin-bottom: 26px; }

  /* 通用按钮 */
  .btn { padding: 10px 18px; font-size: 13.5px; }

  /* 概览/步骤/差旅 卡 */
  .card, .step-card, .travel-card { padding: 20px 16px; }
  .card-icon, .travel-icon { font-size: 28px; margin-bottom: 8px; }
  .card h3, .travel-card h3, .step-card h3, .contact-card h3 { font-size: 15px; }
  .card p, .travel-card p, .step-card p { font-size: 13px; }
  .step-num { font-size: 18px; padding: 3px 12px; }

  /* Stats */
  .speakers-stats { padding: 14px 8px; }
  .stat-num { font-size: 24px; }
  .stat-label { font-size: 9.5px; letter-spacing: .6px; margin-top: 4px; }

  /* Speakers 卡 */
  .speakers-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .speaker-tile-info { padding: 9px 11px; }
  .speaker-tile-info h4 { font-size: 12.5px; min-height: 32px; line-height: 1.3; margin-bottom: 3px; }
  .speaker-tile-info .aff { font-size: 10.5px; line-height: 1.4; margin-bottom: 6px; }
  .speaker-flag { width: 22px; height: 22px; font-size: 14px; bottom: 4px; right: 4px; }

  /* Chair 卡 */
  .chair-card { padding: 18px; gap: 14px; }
  .chair-photo { width: 130px; height: 130px; }
  .chair-name { font-size: 18px; }
  .chair-affil { font-size: 13px; margin-bottom: 12px; }
  .chair-tags { gap: 5px; margin-bottom: 12px; }
  .chair-bio { font-size: 13px; line-height: 1.65; }

  /* Topics */
  .topic-pill { padding: 7px 14px; font-size: 12.5px; }

  /* Timeline */
  .timeline { padding-left: 26px; }
  .timeline::before { left: 6px; }
  .timeline-dot { left: -26px; width: 14px; height: 14px; }
  .timeline-content { padding: 14px 16px; }
  .timeline-event { font-size: 14.5px; }
  .timeline-date { font-size: 11.5px; }
  .timeline-desc { font-size: 12.5px; line-height: 1.65; }

  /* Venue */
  .venue-info { padding: 22px 18px; }
  .venue-info h3 { font-size: 17px; padding-bottom: 12px; }
  .venue-info h3 small { font-size: 12.5px; }
  .vr-row { padding: 10px 0; }
  .vr-label { font-size: 11px; letter-spacing: .9px; margin-bottom: 4px; }
  .vr-value { font-size: 13.5px; line-height: 1.6; }

  /* 高德地图 */
  .amap-canvas { min-height: 240px; }
  .amap-fallback { padding: 20px 14px; }
  .amap-fallback-pin { font-size: 44px; margin-bottom: 10px; }
  .amap-fallback-info strong { font-size: 15px; }
  .amap-fallback-info small { font-size: 11.5px; }
  .amap-fallback-info .amap-coords { font-size: 10.5px; }
  .amap-actions { flex-direction: column; gap: 8px; }
  .btn-amap { padding: 11px 14px; font-size: 13.5px; flex: 0 0 auto; }
  .btn-amap-icon { font-size: 16px; }

  /* Confirm */
  .confirm-card { padding: 20px; gap: 16px; }
  .confirm-mail { gap: 12px; }
  .confirm-icon { font-size: 30px; }
  .confirm-label { font-size: 11px; letter-spacing: 1.4px; }
  .confirm-addr { font-size: 15px; word-break: break-all; }

  /* 组委会 */
  .org-card-header { height: 100px; }
  .org-card-logo { max-height: 70px; }
  .org-card-body { padding: 20px 18px; }
  .org-card-body h3 { font-size: 16.5px; }
  .org-intro { font-size: 13px; }
  .org-meta-list { font-size: 12.5px; }
  .committee-list { padding: 18px 16px; }
  .committee-list h3 { font-size: 15.5px; padding-bottom: 10px; margin-bottom: 14px; }
  .member { padding: 8px 12px; }
  .member-name { font-size: 13.5px; }
  .member-role { font-size: 11.5px; }

  /* Contact */
  .contact-card { padding: 20px 18px; }
  .ct-icon { font-size: 30px; margin-bottom: 6px; }
  .ct-rows { font-size: 13px; line-height: 1.85; padding: 0; }

  /* Tip box */
  .tip-box { padding: 12px 14px; font-size: 13px; gap: 10px; margin-top: 18px; }
  .tip-icon { font-size: 18px; }

  /* Footer */
  .site-footer { padding: 36px 0 0; }
  .footer-orgs { padding: 16px 14px; gap: 14px; }
  .footer-org-img { height: 40px; max-width: 200px; }
  .footer-org-name { font-size: 11.5px; }
  .footer-org-role { font-size: 10px; letter-spacing: 1.6px; }
  .footer-info { font-size: 12.5px; line-height: 1.85; padding: 0 4px; }
  .footer-links { gap: 10px; padding: 12px 0; }
  .footer-links a { font-size: 12.5px; padding: 4px 6px; }
  .footer-bottom p { font-size: 11px; padding: 0 4px; line-height: 1.6; }
}

/* ===== 超小屏 (≤360px，老旧 / 紧凑机型) ===== */
@media (max-width: 360px) {
  .container { padding: 0 12px; }
  .header-logo { height: 32px; max-width: 170px; }
  .logo-title { font-size: 12px; max-width: 110px; }
  .logo-sub { font-size: 10px; }
  .hero-title { font-size: 19px; }
  .hero-title-zh { font-size: 13px; }
  .hero-subtitle { font-size: 13px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .speakers-stats { grid-template-columns: 1fr 1fr; }
  .stat-num { font-size: 22px; }
  .speakers-grid { gap: 8px; }
  .speaker-tile-info { padding: 8px 10px; }
  .speaker-tile-info h4 { font-size: 12px; min-height: 30px; }
  .footer-org-img { height: 36px; max-width: 180px; }
}