/* ===== 海创周 · H5 Styles ===== */

:root {
  --primary: #0a2463;
  --primary-light: #1e3a8a;
  --accent: #06b6d4;
  --accent2: #0284c7;
  --gold: #f59e0b;
  --text: #1e293b;
  --text-light: #64748b;
  --bg: #f8fafc;
  --card: #ffffff;
  --radius: 14px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Helvetica Neue', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; vertical-align: middle; }

.container { max-width: 780px; margin: 0 auto; padding: 0 20px; }

/* ===== Nav ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(10, 36, 99, 0.95); backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.navbar .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 58px; padding: 0 20px;
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 18px; font-weight: 700; color: #fff;
}
.nav-logo svg { width: 30px; height: 30px; }
.nav-toggle {
  background: none; border: none; color: #fff;
  font-size: 22px; cursor: pointer; display: none;
}
.nav-links { display: flex; gap: 6px; list-style: none; }
.nav-links a {
  display: block; padding: 8px 14px;
  font-size: 13px; color: rgba(255,255,255,.7); border-radius: 8px;
  transition: .2s;
}
.nav-links a:hover,
.nav-links a.active { color: #fff; background: rgba(255,255,255,.12); }

@media (max-width: 640px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none; position: absolute; top: 58px; left: 0; right: 0;
    flex-direction: column; background: var(--primary);
    padding: 10px 20px; gap: 2px;
  }
  .nav-links.open { display: flex; }
}

/* ===== Hero ===== */
.hero {
  position: relative; min-height: 100vh; display: flex; align-items: center;
  justify-content: center; overflow: hidden;
  background: linear-gradient(135deg, #0a2463 0%, #1e3a8a 35%, #0369a1 65%, #0e7490 100%);
}
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 600px 400px at 20% 30%, rgba(6,182,212,.15) 0%, transparent 70%),
    radial-gradient(ellipse 500px 500px at 80% 70%, rgba(245,158,11,.06) 0%, transparent 60%);
}
.hero-particles {
  position: absolute; inset: 0; overflow: hidden;
  opacity: .35;
}
.hero-particles span {
  position: absolute; width: 3px; height: 3px;
  background: rgba(255,255,255,.5); border-radius: 50%;
  animation: float linear infinite;
}
@keyframes float {
  0% { transform: translateY(100vh) scale(0); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: .3; }
  100% { transform: translateY(-20px) scale(1); opacity: 0; }
}
.hero-content {
  position: relative; z-index: 2; text-align: center;
  padding: 100px 24px 60px; max-width: 640px;
}
.hero-badge {
  display: inline-block; padding: 6px 18px; margin-bottom: 20px;
  background: rgba(255,255,255,.12); backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,.2); border-radius: 30px;
  font-size: 13px; color: rgba(255,255,255,.85); letter-spacing: 2px;
}
.hero-content h1 {
  font-size: clamp(32px, 7vw, 52px); font-weight: 800; color: #fff;
  line-height: 1.2; margin-bottom: 12px;
}
.hero-content h1 small {
  display: block; font-size: clamp(15px, 3vw, 20px);
  font-weight: 400; color: rgba(255,255,255,.7); margin-top: 8px;
}
/* ===== Countdown Board ===== */
.countdown-wrap { margin: 28px 0 24px; text-align: center; }
.countdown-label {
  font-size: 13px; color: rgba(255,255,255,.6); letter-spacing: 4px;
  margin-bottom: 14px; text-transform: uppercase;
}
.countdown-board {
  display: inline-flex; align-items: center; gap: 6px;
  background: rgba(0,0,0,.35); backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 16px; padding: 14px 20px;
}
.cd-block { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.cd-num {
  display: block; min-width: 60px;
  font-size: clamp(32px, 8vw, 52px); font-weight: 800;
  color: #fff; text-align: center;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 20px rgba(6,182,212,.4);
  background: rgba(255,255,255,.06);
  border-radius: 10px; padding: 6px 10px;
  line-height: 1;
}
.cd-unit {
  font-size: 11px; color: rgba(255,255,255,.5); letter-spacing: 2px;
}
.cd-sep {
  font-size: clamp(24px, 5vw, 38px); font-weight: 300;
  color: rgba(255,255,255,.4); margin-top: -12px;
  animation: pulse 1s ease infinite;
}
@keyframes pulse {
  0%, 100% { opacity: .4; }
  50% { opacity: .8; }
}

.hero-content .sub {
  font-size: 15px; color: rgba(255,255,255,.65);
  margin-bottom: 30px; max-width: 480px; margin-left: auto; margin-right: auto;
}
.hero-stats {
  display: flex; justify-content: center; gap: 30px; margin: 30px 0;
}
.hero-stat { text-align: center; }
.hero-stat .num {
  display: block; font-size: 28px; font-weight: 800; color: var(--accent);
}
.hero-stat .lbl {
  font-size: 12px; color: rgba(255,255,255,.6); margin-top: 2px;
}
.hero-cta {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 36px; margin-top: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff; font-size: 16px; font-weight: 600; border-radius: 30px;
  box-shadow: 0 8px 24px rgba(6,182,212,.35);
  transition: .3s;
}
.hero-cta:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(6,182,212,.45); }

/* ===== Section Common ===== */
section { padding: 60px 0; }
.section-title { text-align: center; margin-bottom: 40px; }
.section-title .tag {
  display: inline-block; padding: 4px 14px; margin-bottom: 10px;
  background: rgba(6,182,212,.1); color: var(--accent2);
  border-radius: 16px; font-size: 12px; font-weight: 600;
}
.section-title h2 {
  font-size: clamp(24px, 5vw, 32px); font-weight: 800;
}
.section-title p {
  color: var(--text-light); font-size: 14px; margin-top: 6px;
}
.section-title .bar {
  width: 50px; height: 3px; margin: 14px auto 0;
  background: linear-gradient(90deg, var(--accent), var(--accent2)); border-radius: 2px;
}

/* ===== About ===== */
.about-card {
  background: var(--card); border-radius: var(--radius);
  padding: 30px 24px; box-shadow: 0 1px 4px rgba(0,0,0,.06);
}
.about-stats-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px;
  margin-top: 20px;
}
.stat-card {
  background: linear-gradient(135deg, #eef2ff, #f0fdfa);
  border-radius: 12px; padding: 18px; text-align: center;
}
.stat-card .num {
  display: block; font-size: 26px; font-weight: 800; color: var(--primary);
}
.stat-card .lbl { font-size: 12px; color: var(--text-light); margin-top: 2px; }

/* ===== Info ===== */
.info-grid { display: grid; gap: 12px; }
.info-item {
  display: flex; align-items: flex-start; gap: 14px;
  background: var(--card); border-radius: var(--radius);
  padding: 20px; box-shadow: 0 1px 4px rgba(0,0,0,.06);
}
.info-item .icon {
  width: 42px; height: 42px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: 12px; color: #fff; font-size: 18px;
}
.info-item h4 { font-size: 14px; font-weight: 700; }
.info-item p { font-size: 13px; color: var(--text-light); margin-top: 2px; }

/* ===== Activities ===== */
.act-header {
  display: flex; align-items: center; gap: 12px; margin-bottom: 24px;
}
.act-number {
  width: 50px; height: 50px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--primary), #312e81);
  color: #fff; font-size: 22px; font-weight: 800; border-radius: 50%;
}
.act-title h3 { font-size: 18px; font-weight: 700; }
.act-title p { font-size: 13px; color: var(--text-light); }

.act-grid { display: grid; gap: 10px; margin-bottom: 28px; }
.act-item {
  display: flex; gap: 12px; padding: 16px;
  background: var(--card); border-radius: var(--radius);
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
  border-left: 3px solid var(--accent);
}
.act-item .idx { font-size: 13px; font-weight: 700; color: var(--accent2); white-space: nowrap; }
.act-item .desc { font-size: 14px; }

/* ===== Speakers ===== */
/* ===== Accordion (风琴页) ===== */
.accordion { display: flex; flex-direction: column; gap: 8px; }
.accordion-item {
  background: var(--card); border-radius: var(--radius);
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
  overflow: hidden;
  transition: .2s;
}
.accordion-item.open { box-shadow: 0 4px 16px rgba(0,0,0,.1); }
.accordion-header {
  display: flex; align-items: center; gap: 12px;
  padding: 16px; cursor: pointer; user-select: none;
  -webkit-tap-highlight-color: transparent;
}
.accordion-header:active { background: rgba(0,0,0,.02); }
.accordion-header .avatar {
  width: 44px; height: 44px; flex-shrink: 0;
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff; font-size: 18px; font-weight: 700;
}
.accordion-header .info { flex: 1; min-width: 0; }
.accordion-header .info h4 { font-size: 15px; font-weight: 700; }
.accordion-header .info .role { font-size: 12px; color: var(--accent2); margin-top: 1px; }
.accordion-header .arrow {
  flex-shrink: 0; width: 24px; text-align: center;
  color: var(--text-light); transition: transform .3s;
  font-size: 14px;
}
.accordion-item.open .accordion-header .arrow { transform: rotate(180deg); }
.accordion-body {
  max-height: 0; overflow: hidden;
  transition: max-height .35s ease, padding .35s ease;
  padding: 0 16px;
}
.accordion-item.open .accordion-body {
  max-height: 200px;
  padding: 0 16px 16px;
}
.accordion-body .title { font-size: 13px; color: var(--text); font-weight: 600; }
.accordion-body .bio-detail { font-size: 13px; color: var(--text-light); margin-top: 4px; line-height: 1.7; }

/* ===== Timeline ===== */
.timeline { position: relative; padding-left: 32px; }
.timeline::before {
  content: ''; position: absolute; left: 11px; top: 0; bottom: 0;
  width: 2px; background: linear-gradient(to bottom, var(--accent), var(--primary));
}
.tl-item {
  position: relative; padding-bottom: 22px;
}
.tl-item::before {
  content: ''; position: absolute; left: -24px; top: 5px;
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--accent); border: 2px solid #fff;
  box-shadow: 0 0 0 2px var(--accent);
}
.tl-item.year-dot::before { background: var(--gold); box-shadow: 0 0 0 2px var(--gold); }
.tl-item .year { font-size: 13px; font-weight: 700; color: var(--accent2); }
.tl-item .desc { font-size: 14px; margin-top: 2px; }

/* ===== Media ===== */
.media-grid { display: grid; gap: 12px; }
.media-card {
  display: flex; gap: 14px; padding: 16px;
  background: var(--card); border-radius: var(--radius);
  box-shadow: 0 1px 4px rgba(0,0,0,.06); cursor: pointer;
  transition: .2s;
}
.media-card:hover { box-shadow: 0 4px 16px rgba(0,0,0,.1); }
.media-card .thumb {
  width: 80px; height: 60px; flex-shrink: 0; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; background: linear-gradient(135deg, #eef2ff, #f0fdfa);
}
.media-card .body { flex: 1; min-width: 0; }
.media-card h4 { font-size: 14px; font-weight: 600; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.media-card .src { font-size: 12px; color: var(--text-light); margin-top: 2px; }

/* ===== Alt Section ===== */
.section-alt { background: var(--card); }

/* ===== 签到 ===== */
.checkin-card {
  background: var(--card); border-radius: var(--radius);
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
  margin-bottom: 20px; overflow: hidden;
}
.checkin-form { padding: 24px; }
.checkin-hero { text-align: center; margin-bottom: 18px; }
.checkin-hero .checkin-icon { font-size: 40px; display: block; margin-bottom: 8px; }
.checkin-hero h3 { font-size: 18px; font-weight: 700; }
.checkin-hero p { font-size: 13px; color: var(--text-light); margin-top: 2px; }
.checkin-input-row {
  display: flex; gap: 10px;
}
.checkin-input-row input {
  flex: 1; border: 2px solid #e2e8f0; border-radius: 12px;
  padding: 14px 16px; font-size: 16px; font-family: inherit;
  outline: none; transition: .2s; background: #f8fafc;
}
.checkin-input-row input:focus {
  border-color: var(--accent); background: #fff;
  box-shadow: 0 0 0 3px rgba(6,182,212,.1);
}
.checkin-input-row button {
  padding: 14px 28px; flex-shrink: 0;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff; border: none; border-radius: 12px;
  font-size: 16px; font-weight: 700; cursor: pointer;
  transition: .2s; white-space: nowrap;
}
.checkin-input-row button:active { transform: scale(.97); }
.checkin-input-row button:disabled { opacity: .5; cursor: not-allowed; }

.checkin-done {
  padding: 30px 24px; text-align: center;
}
.checkin-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 28px;
  background: linear-gradient(135deg, #059669, #10b981);
  color: #fff; border-radius: 30px; font-size: 20px; font-weight: 700;
  margin-bottom: 16px; box-shadow: 0 4px 16px rgba(5,150,105,.25);
}
.checkin-badge .cb-icon { font-size: 24px; }
.checkin-info {
  font-size: 15px; color: var(--text); margin-bottom: 14px;
}
.checkin-info strong {
  font-size: 22px; color: var(--accent2);
}
.checkin-stamp {
  display: inline-block; padding: 8px 20px;
  background: #fef3c7; color: #92400e; border-radius: 20px;
  font-size: 18px; font-weight: 700;
  transform: rotate(-3deg);
  margin-bottom: 16px;
}
.checkin-reset {
  display: block; margin: 0 auto;
  background: none; border: 1px solid #e2e8f0; border-radius: 20px;
  padding: 8px 20px; font-size: 13px; color: var(--text-light);
  cursor: pointer; transition: .2s;
}
.checkin-reset:hover { border-color: var(--text-light); color: var(--text); }

.checkin-list-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 10px; font-size: 14px; color: var(--text);
}
.checkin-list-header strong { color: var(--accent2); }
.checkin-clear-btn {
  border: none; background: none; cursor: pointer;
  font-size: 12px; color: var(--text-light); padding: 4px 8px; border-radius: 6px;
}
.checkin-clear-btn:hover { background: #f1f5f9; color: #dc2626; }

.checkin-list { display: flex; flex-direction: column; gap: 6px; }
.checkin-person {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 14px; background: var(--card); border-radius: 10px;
  box-shadow: 0 1px 3px rgba(0,0,0,.04);
  animation: slideUp .3s ease;
}
.checkin-person .rank {
  width: 28px; height: 28px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  background: linear-gradient(135deg, #eef2ff, #f0fdfa);
  font-size: 12px; font-weight: 700; color: var(--accent2);
}
.checkin-person .rank.top3 { background: linear-gradient(135deg, #fef3c7, #fde68a); color: #92400e; }
.checkin-person .ci-name { font-size: 14px; font-weight: 600; flex: 1; }
.checkin-person .ci-time { font-size: 11px; color: var(--text-light); }
.checkin-person .ci-del {
  background: none; border: none; color: #cbd5e1; cursor: pointer;
  font-size: 12px; padding: 2px 6px; border-radius: 4px;
}
.checkin-person .ci-del:hover { color: #dc2626; background: #f1f5f9; }

/* ===== 留言板 (本地存储) ===== */
.gb-form {
  background: var(--card); border-radius: var(--radius);
  padding: 20px; box-shadow: 0 1px 4px rgba(0,0,0,.06);
  margin-bottom: 20px;
}
.gb-form > p { font-size: 14px; color: var(--text); margin-bottom: 14px; font-weight: 600; }
.gb-form input,
.gb-form textarea {
  width: 100%; border: 1px solid #e2e8f0; border-radius: 10px;
  padding: 11px 14px; font-size: 14px; font-family: inherit;
  outline: none; transition: .2s; box-sizing: border-box;
  background: #f8fafc;
}
.gb-form input:focus,
.gb-form textarea:focus {
  border-color: var(--accent); background: #fff;
  box-shadow: 0 0 0 3px rgba(6,182,212,.1);
}
.gb-form textarea { resize: vertical; min-height: 60px; margin-top: 10px; }
.gb-form-actions {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 10px; gap: 8px; flex-wrap: wrap;
}
.gb-counter { font-size: 12px; color: var(--text-light); }
.gb-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 22px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff; border: none; border-radius: 30px;
  font-size: 14px; font-weight: 600; cursor: pointer;
  transition: .2s;
}
.gb-btn:hover { opacity: .9; transform: translateY(-1px); }
.gb-btn:disabled { opacity: .5; cursor: not-allowed; }
.gb-item {
  background: var(--card); border-radius: var(--radius);
  padding: 14px 16px; box-shadow: 0 1px 4px rgba(0,0,0,.06);
  animation: slideUp .3s ease;
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
.gb-item-head {
  display: flex; align-items: center; gap: 8px; margin-bottom: 6px;
}
.gb-item-avatar {
  font-size: 20px; line-height: 1;
}
.gb-item-name { font-size: 14px; font-weight: 600; }
.gb-item-time {
  font-size: 11px; color: var(--text-light); margin-left: auto;
}
.gb-item-text {
  font-size: 14px; line-height: 1.7; color: var(--text);
  padding-left: 30px;
}
.gb-item-del {
  background: none; border: none; color: #cbd5e1; cursor: pointer;
  font-size: 12px; padding: 2px 6px; border-radius: 4px;
  margin-left: 4px;
}
.gb-item-del:hover { color: #dc2626; background: #f1f5f9; }
/* ===== 折叠/展开按钮 ===== */
.toggle-expand {
  text-align: center;
  padding: 12px;
  color: var(--accent2);
  font-size: 13px;
  cursor: pointer;
  user-select: none;
  transition: color .2s;
  clear: both;
}
.toggle-expand:hover { color: var(--accent); }
.toggle-expand i { font-size: 11px; margin-left: 4px; }

/* 签到和留言列表最小高度，防止展开/收起时页面跳动 */
#checkinList, #gbList { min-height: 80px; }
.gb-item, .checkin-person { animation: fadeIn .25s ease; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

footer {
  background: var(--primary); color: rgba(255,255,255,.8); padding: 40px 0 20px;
}
footer .container { display: flex; flex-direction: column; gap: 16px; }
footer .brand { font-size: 16px; font-weight: 700; color: #fff; margin-bottom: 4px; }
footer .info { font-size: 13px; line-height: 1.8; }
footer .info i { width: 18px; color: var(--accent); }
.footer-bottom {
  text-align: center; padding-top: 20px; margin-top: 20px;
  border-top: 1px solid rgba(255,255,255,.1);
  font-size: 12px; color: rgba(255,255,255,.5);
}

/* ===== Fade In ===== */
.fade-in { opacity: 0; transform: translateY(20px); transition: .6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }