/* ============================================================
   欧美同学会北欧零碳委员会官网
   WRSA Nordic Zero-Carbon Committee Official Website
   Design: Polar Glacier Blue / Forest Green / Carbon Ink Gray / Bamboo Green
   ============================================================ */

:root {
  /* Brand palette */
  --glacier: #1B6B93;          /* 极地冰川蓝 primary */
  --glacier-deep: #124C6E;     /* deep glacier blue */
  --glacier-light: #2E9CC5;    /* light glacier blue */
  --glacier-mist: #EAF3F8;     /* mist background */
  --forest: #2D6A4F;           /* 森林绿 */
  --forest-deep: #1E4A37;
  --forest-light: #40916C;
  --bamboo: #74A57F;           /* 竹绿 */
  --bamboo-light: #A3C9A8;
  --carbon: #212529;           /* 碳墨灰 */
  --carbon-soft: #495057;
  --carbon-mist: #6C757D;
  --snow: #F7FAFB;             /* page background */
  --white: #FFFFFF;
  --line: #DEE7EC;

  /* Semantic */
  --primary: var(--glacier);
  --accent: var(--forest);
  --text-main: #1A2430;
  --text-body: #3D4A56;
  --text-muted: #6B7A87;

  /* Layout */
  --maxw: 1200px;
  --header-h: 76px;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 2px 8px rgba(18, 76, 110, 0.07);
  --shadow-md: 0 6px 24px rgba(18, 76, 110, 0.10);
  --shadow-lg: 0 12px 40px rgba(18, 76, 110, 0.16);

  /* Type */
  --font-zh: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", sans-serif;
  --font-en: "Inter", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Georgia", "Noto Serif SC", "Songti SC", "SimSun", serif;
}

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

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 12px); }

body {
  font-family: var(--font-zh);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-body);
  background: var(--snow);
  -webkit-font-smoothing: antialiased;
}

body.en { font-family: var(--font-en); }

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

::selection { background: var(--glacier); color: #fff; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 32px; }

/* ============ Top utility bar ============ */
.topbar {
  background: var(--carbon);
  color: rgba(255,255,255,0.78);
  font-size: 12.5px;
  height: 36px;
  display: flex;
  align-items: center;
}
.topbar .container { display: flex; justify-content: space-between; align-items: center; width: 100%; }
.topbar a:hover { color: #fff; }
.topbar-links { display: flex; gap: 22px; }
.topbar-right { display: flex; align-items: center; gap: 18px; }

/* ============ Header / Nav ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow 0.3s;
}
.site-header.scrolled { box-shadow: var(--shadow-md); }
.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.brand { display: flex; align-items: center; gap: 14px; flex-shrink: 0; }
.brand-mark {
  width: 46px; height: 46px; flex-shrink: 0;
  filter: drop-shadow(0 2px 6px rgba(27,107,147,0.3));
}
.brand-text { line-height: 1.25; }
.brand-title { font-size: 17.5px; font-weight: 700; color: var(--carbon); letter-spacing: 0.5px; white-space: nowrap; }
.brand-sub { font-size: 11px; color: var(--text-muted); letter-spacing: 0.4px; white-space: nowrap; }

.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  padding: 8px 14px;
  font-size: 15px;
  color: var(--text-body);
  border-radius: 6px;
  transition: color 0.2s, background 0.2s;
  white-space: nowrap;
}
.main-nav a:hover { color: var(--glacier); background: var(--glacier-mist); }
.main-nav a.active {
  color: var(--glacier);
  font-weight: 600;
  position: relative;
}
.main-nav a.active::after {
  content: "";
  position: absolute;
  left: 14px; right: 14px; bottom: 2px;
  height: 2.5px;
  background: linear-gradient(90deg, var(--glacier), var(--forest-light));
  border-radius: 2px;
}

.header-actions { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }

.lang-toggle {
  display: flex;
  align-items: center;
  border: 1.5px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  font-size: 13px;
}
.lang-toggle button {
  padding: 5px 14px;
  color: var(--text-muted);
  transition: all 0.2s;
  font-weight: 600;
}
.lang-toggle button.on { background: var(--glacier); color: #fff; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 10px;
}
.nav-toggle span {
  width: 22px; height: 2px;
  background: var(--carbon);
  border-radius: 2px;
  transition: all 0.3s;
}

/* ============ Hero ============ */
.hero {
  position: relative;
  background:
    radial-gradient(ellipse 900px 480px at 85% -10%, rgba(64,145,108,0.28), transparent 60%),
    radial-gradient(ellipse 1000px 560px at -10% 110%, rgba(46,156,197,0.25), transparent 60%),
    linear-gradient(135deg, #0E3A56 0%, #14587C 42%, #1B6B93 70%, #2D6A4F 130%);
  color: #fff;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    radial-gradient(rgba(255,255,255,0.13) 1px, transparent 1px);
  background-size: 26px 26px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,0.5), transparent 75%);
  -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,0.5), transparent 75%);
}
.hero-wave { position: absolute; bottom: -2px; left: 0; width: 100%; line-height: 0; }
.hero-wave svg { width: 100%; height: 90px; display: block; }

.hero-inner {
  position: relative;
  padding: 96px 0 128px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 18px;
  border: 1px solid rgba(255,255,255,0.35);
  border-radius: 999px;
  font-size: 13.5px;
  letter-spacing: 1px;
  background: rgba(255,255,255,0.10);
  backdrop-filter: blur(6px);
  margin-bottom: 28px;
}
.hero-badge .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #7BE495;
  box-shadow: 0 0 10px #7BE495;
}
.hero h1 {
  font-size: clamp(30px, 4.4vw, 52px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: 1px;
  max-width: 820px;
  margin-bottom: 22px;
}
.hero h1 .grad {
  background: linear-gradient(90deg, #9BE3FF 0%, #7BE495 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p.lead {
  font-size: clamp(15px, 1.6vw, 18.5px);
  color: rgba(255,255,255,0.85);
  max-width: 680px;
  margin-bottom: 40px;
}
.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 30px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.5px;
  transition: all 0.25s;
}
.btn svg { width: 17px; height: 17px; }
.btn-primary {
  background: #fff;
  color: var(--glacier-deep);
  box-shadow: 0 6px 20px rgba(0,0,0,0.22);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 28px rgba(0,0,0,0.30); }
.btn-ghost {
  border: 1.5px solid rgba(255,255,255,0.5);
  color: #fff;
}
.btn-ghost:hover { background: rgba(255,255,255,0.12); border-color: #fff; }
.btn-solid {
  background: linear-gradient(120deg, var(--glacier) 0%, var(--forest-light) 100%);
  color: #fff;
  box-shadow: 0 6px 18px rgba(27,107,147,0.32);
}
.btn-solid:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(27,107,147,0.40); }
.btn-outline {
  border: 1.5px solid var(--glacier);
  color: var(--glacier);
}
.btn-outline:hover { background: var(--glacier-mist); }

/* ============ Page hero (subpages) ============ */
.page-hero {
  background:
    radial-gradient(ellipse 700px 320px at 90% 0%, rgba(64,145,108,0.22), transparent 60%),
    linear-gradient(120deg, #103A55 0%, #14587C 55%, #1B6B93 100%);
  color: #fff;
  padding: 72px 0 64px;
  position: relative;
  overflow: hidden;
}
.page-hero::after {
  content: "";
  position: absolute; inset: 0;
  background-image: radial-gradient(rgba(255,255,255,0.10) 1px, transparent 1px);
  background-size: 24px 24px;
  mask-image: linear-gradient(140deg, rgba(0,0,0,0.4), transparent 60%);
  -webkit-mask-image: linear-gradient(140deg, rgba(0,0,0,0.4), transparent 60%);
}
.page-hero .container { position: relative; }
.crumbs {
  font-size: 13px;
  color: rgba(255,255,255,0.65);
  margin-bottom: 16px;
}
.crumbs a:hover { color: #fff; text-decoration: underline; }
.crumbs .sep { margin: 0 8px; opacity: 0.6; }
.page-hero h1 {
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 800;
  letter-spacing: 1px;
  margin-bottom: 12px;
}
.page-hero p { color: rgba(255,255,255,0.82); max-width: 700px; font-size: 16px; }

/* ============ Stats band ============ */
.stats-band {
  background: var(--white);
  border-bottom: 1px solid var(--line);
  position: relative;
  z-index: 5;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 44px 0;
}
.stat-item { text-align: center; position: relative; }
.stat-item:not(:last-child)::after {
  content: "";
  position: absolute;
  right: -12px; top: 50%;
  transform: translateY(-50%);
  width: 1px; height: 52px;
  background: var(--line);
}
.stat-num {
  font-size: 42px;
  font-weight: 800;
  line-height: 1.1;
  background: linear-gradient(120deg, var(--glacier) 20%, var(--forest-light) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-variant-numeric: tabular-nums;
}
.stat-label { font-size: 14px; color: var(--text-muted); margin-top: 6px; letter-spacing: 0.5px; }

/* ============ Sections ============ */
.section { padding: 88px 0; }
.section.alt { background: var(--white); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { max-width: 720px; margin-bottom: 52px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2.5px;
  color: var(--forest-light);
  text-transform: uppercase;
  margin-bottom: 14px;
}
.kicker::before { content: ""; width: 28px; height: 2.5px; background: var(--forest-light); border-radius: 2px; }
.section-head.center .kicker::after { content: ""; width: 28px; height: 2.5px; background: var(--forest-light); border-radius: 2px; }
.section-head h2 {
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 800;
  color: var(--carbon);
  line-height: 1.35;
  margin-bottom: 14px;
}
.section-head p { color: var(--text-muted); font-size: 16px; }

/* ============ Cards ============ */
.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  position: relative;
  overflow: hidden;
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--glacier), var(--forest-light));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s;
}
.card:hover::before { transform: scaleX(1); }

.card-icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  background: var(--glacier-mist);
  color: var(--glacier);
}
.card-icon svg { width: 27px; height: 27px; }
.card-icon.green { background: #E8F3EC; color: var(--forest); }
.card h3 { font-size: 19px; font-weight: 700; color: var(--carbon); margin-bottom: 10px; }
.card p { font-size: 14.5px; color: var(--text-muted); margin-bottom: 16px; }
.card .card-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--glacier);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.card .card-link:hover { gap: 10px; }
.card .card-link svg { width: 15px; height: 15px; transition: all 0.2s; }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

/* ============ Research direction cards ============ */
.dir-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 34px 28px 30px;
  position: relative;
  transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  display: flex;
  flex-direction: column;
}
.dir-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.dir-num {
  position: absolute;
  top: 22px; right: 26px;
  font-size: 44px;
  font-weight: 900;
  color: var(--glacier-mist);
  line-height: 1;
  font-family: var(--font-en);
}
.dir-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--forest-light);
  text-transform: uppercase;
  margin-bottom: 14px;
}
.dir-card h3 { font-size: 21px; font-weight: 700; color: var(--carbon); margin-bottom: 12px; }
.dir-card p { font-size: 14.5px; color: var(--text-muted); flex: 1; }
.dir-card .topics { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.dir-card .topics span {
  font-size: 12.5px;
  padding: 4px 12px;
  background: var(--glacier-mist);
  color: var(--glacier-deep);
  border-radius: 999px;
}

/* ============ Expert cards ============ */
.expert-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 30px 24px;
  text-align: center;
  transition: all 0.3s;
}
.expert-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.expert-avatar {
  width: 84px; height: 84px;
  border-radius: 50%;
  margin: 0 auto 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  font-weight: 700;
  color: #fff;
  font-family: var(--font-zh);
  box-shadow: 0 4px 14px rgba(27,107,147,0.28);
}
.avatar-a { background: linear-gradient(135deg, #1B6B93, #2E9CC5); }
.avatar-b { background: linear-gradient(135deg, #2D6A4F, #74A57F); }
.avatar-c { background: linear-gradient(135deg, #124C6E, #40916C); }
.avatar-d { background: linear-gradient(135deg, #40916C, #2E9CC5); }
.avatar-e { background: linear-gradient(135deg, #14587C, #74A57F); }
.avatar-f { background: linear-gradient(135deg, #1E4A37, #2E9CC5); }
.expert-card h4 { font-size: 18px; font-weight: 700; color: var(--carbon); margin-bottom: 5px; }
.expert-card .role { font-size: 13px; color: var(--forest-light); font-weight: 600; margin-bottom: 10px; }
.expert-card .bio { font-size: 13.5px; color: var(--text-muted); line-height: 1.65; }
.expert-card .badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-top: 14px;
  font-size: 11.5px;
  font-weight: 700;
  padding: 3px 12px;
  border-radius: 999px;
  background: #FFF7E6;
  color: #B27A00;
  border: 1px solid #F5E3B8;
}
.expert-card .badge.blue { background: var(--glacier-mist); color: var(--glacier-deep); border-color: #C8DFEC; }

/* ============ Feature split layout ============ */
.feature-split {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 64px;
  align-items: center;
}
.feature-visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  min-height: 380px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.feature-content .kicker { margin-bottom: 12px; }
.feature-content h2 { font-size: clamp(23px, 2.8vw, 32px); font-weight: 800; color: var(--carbon); line-height: 1.35; margin-bottom: 18px; }
.feature-content p { color: var(--text-muted); margin-bottom: 16px; }
.check-list { margin-top: 24px; display: grid; gap: 14px; }
.check-item { display: flex; gap: 12px; align-items: flex-start; }
.check-item .ck {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: #E8F3EC;
  color: var(--forest);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 3px;
}
.check-item .ck svg { width: 12px; height: 12px; }
.check-item b { color: var(--carbon); font-weight: 700; }
.check-item span { display: block; font-size: 14.5px; color: var(--text-muted); }

/* ============ Quote block ============ */
.quote-block {
  background:
    radial-gradient(ellipse 600px 300px at 100% 0%, rgba(46,156,197,0.10), transparent 60%),
    var(--white);
  border: 1px solid var(--line);
  border-left: 5px solid var(--glacier);
  border-radius: var(--radius);
  padding: 40px 44px;
  position: relative;
}
.quote-block::before {
  content: "\201C";
  position: absolute;
  top: 6px; right: 30px;
  font-size: 110px;
  font-family: Georgia, serif;
  color: var(--glacier-mist);
  line-height: 1;
}
.quote-block p {
  font-size: 17.5px;
  line-height: 1.9;
  color: var(--text-main);
  font-family: var(--font-serif);
  position: relative;
}
.quote-attr { margin-top: 22px; display: flex; align-items: center; gap: 14px; }
.quote-attr .avatar {
  width: 52px; height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--glacier), var(--forest-light));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
}
.quote-attr b { display: block; color: var(--carbon); font-size: 15.5px; }
.quote-attr span { font-size: 13px; color: var(--text-muted); }

/* ============ News ============ */
.news-item {
  display: flex;
  gap: 24px;
  padding: 26px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--white);
  transition: all 0.25s;
  align-items: flex-start;
}
.news-item:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); border-color: transparent; }
.news-date {
  flex-shrink: 0;
  width: 64px;
  text-align: center;
  border-radius: var(--radius);
  background: var(--glacier-mist);
  padding: 10px 6px 8px;
}
.news-date b { display: block; font-size: 24px; font-weight: 800; color: var(--glacier); line-height: 1.1; font-family: var(--font-en); }
.news-date span { font-size: 12px; color: var(--text-muted); }
.news-body h3 { font-size: 17px; font-weight: 700; color: var(--carbon); margin-bottom: 8px; line-height: 1.5; }
.news-body h3:hover { color: var(--glacier); }
.news-body p { font-size: 14px; color: var(--text-muted); margin-bottom: 10px; }
.news-meta { display: flex; gap: 14px; font-size: 12.5px; color: var(--text-muted); }
.news-meta .tag {
  color: var(--forest-light);
  background: #E8F3EC;
  padding: 2px 10px;
  border-radius: 999px;
  font-weight: 600;
}

/* ============ Map ============ */
.map-wrap {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}
.map-svg { width: 100%; height: auto; display: block; }
.map-legend {
  display: flex;
  gap: 28px;
  justify-content: center;
  margin-top: 18px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--text-muted);
}
.map-legend span { display: inline-flex; align-items: center; gap: 8px; }
.map-legend i { width: 12px; height: 12px; border-radius: 50%; display: inline-block; }

/* ============ Logo wall ============ */
.logo-wall {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.logo-cell {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  height: 92px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.25s;
  text-align: center;
  padding: 12px;
}
.logo-cell:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); border-color: var(--glacier-light); }
.logo-cell span { font-weight: 700; font-size: 14.5px; color: var(--carbon-soft); letter-spacing: 0.3px; }
.logo-cell small { display: block; font-size: 11px; color: var(--text-muted); font-weight: 400; margin-top: 2px; }

/* ============ Steps / path ============ */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  position: relative;
  counter-reset: step;
}
.step {
  position: relative;
  padding: 0 26px;
  text-align: center;
  counter-increment: step;
}
.step::before {
  content: counter(step);
  width: 52px; height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--glacier), var(--forest-light));
  color: #fff;
  font-size: 20px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 18px;
  box-shadow: 0 5px 16px rgba(27,107,147,0.30);
  position: relative;
  z-index: 2;
}
.step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 26px;
  left: calc(50% + 32px);
  width: calc(100% - 64px);
  height: 2.5px;
  background: repeating-linear-gradient(90deg, var(--glacier-light) 0 8px, transparent 8px 16px);
}
.step h4 { font-size: 17px; font-weight: 700; color: var(--carbon); margin-bottom: 8px; }
.step p { font-size: 13.5px; color: var(--text-muted); }

/* ============ Timeline ============ */
.timeline { position: relative; padding-left: 34px; }
.timeline::before {
  content: "";
  position: absolute;
  left: 8px; top: 6px; bottom: 6px;
  width: 2.5px;
  background: linear-gradient(to bottom, var(--glacier), var(--forest-light));
  border-radius: 2px;
}
.tl-item { position: relative; padding-bottom: 34px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: "";
  position: absolute;
  left: -34px; top: 7px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--white);
  border: 4px solid var(--glacier);
  box-shadow: 0 0 0 4px rgba(27,107,147,0.12);
}
.tl-item .tl-date { font-size: 13px; font-weight: 700; color: var(--forest-light); letter-spacing: 0.5px; margin-bottom: 6px; }
.tl-item h4 { font-size: 17px; font-weight: 700; color: var(--carbon); margin-bottom: 6px; }
.tl-item p { font-size: 14px; color: var(--text-muted); }

/* ============ Table (reports / archives) ============ */
.data-table { width: 100%; border-collapse: collapse; background: var(--white); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); }
.data-table th {
  background: var(--glacier-deep);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  text-align: left;
  padding: 14px 20px;
  letter-spacing: 0.5px;
}
.data-table td {
  padding: 13px 20px;
  font-size: 14px;
  border-bottom: 1px solid var(--line);
  color: var(--text-body);
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tbody tr { transition: background 0.2s; }
.data-table tbody tr:hover { background: var(--glacier-mist); }
.data-table .dl-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--glacier);
  font-weight: 600;
  font-size: 13.5px;
}
.data-table .dl-link:hover { text-decoration: underline; }
.data-table .dl-link svg { width: 14px; height: 14px; }

/* ============ Tabs ============ */
.tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 36px; }
.tab-btn {
  padding: 9px 22px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  border: 1.5px solid var(--line);
  transition: all 0.2s;
}
.tab-btn:hover { border-color: var(--glacier-light); color: var(--glacier); }
.tab-btn.on {
  background: linear-gradient(120deg, var(--glacier), var(--forest-light));
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 12px rgba(27,107,147,0.28);
}

/* ============ CTA band ============ */
.cta-band {
  background:
    radial-gradient(ellipse 700px 300px at 10% 120%, rgba(116,165,127,0.35), transparent 60%),
    linear-gradient(120deg, #103A55, #1B6B93 60%, #2D6A4F 140%);
  color: #fff;
  padding: 72px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-band h2 { font-size: clamp(24px, 3vw, 34px); font-weight: 800; margin-bottom: 14px; letter-spacing: 1px; }
.cta-band p { color: rgba(255,255,255,0.82); max-width: 640px; margin: 0 auto 34px; }

/* ============ Footer ============ */
.site-footer { background: var(--carbon); color: rgba(255,255,255,0.72); font-size: 14px; }
.footer-main { padding: 64px 0 48px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 44px; }
.footer-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.footer-brand .brand-title { color: #fff; font-size: 16px; }
.footer-brand .brand-sub { color: rgba(255,255,255,0.5); }
.footer-desc { line-height: 1.85; font-size: 13.5px; }
.footer-grid h4 {
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 18px;
  letter-spacing: 1px;
  position: relative;
  padding-bottom: 10px;
}
.footer-grid h4::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 26px; height: 2px;
  background: var(--forest-light);
}
.footer-grid ul { display: grid; gap: 10px; }
.footer-grid ul a:hover { color: #fff; }
.footer-contact li { display: flex; gap: 10px; align-items: flex-start; margin-bottom: 10px; font-size: 13.5px; }
.footer-contact svg { width: 15px; height: 15px; margin-top: 5px; flex-shrink: 0; color: var(--bamboo-light); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12);
  padding: 22px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12.5px;
  color: rgba(255,255,255,0.45);
}
.footer-bottom .container { display: flex; justify-content: space-between; align-items: center; width: 100%; flex-wrap: wrap; gap: 10px; }

/* ============ Reveal animation ============ */
.reveal { opacity: 1; transform: none; }
.js .reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.22, 1, 0.36, 1); }
.js .reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: 0.10s; }
.reveal.d2 { transition-delay: 0.20s; }
.reveal.d3 { transition-delay: 0.30s; }
.reveal.d4 { transition-delay: 0.40s; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ============ Back to top ============ */
.back-top {
  position: fixed;
  right: 28px; bottom: 28px;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: var(--glacier);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s;
  z-index: 90;
}
.back-top.show { opacity: 1; pointer-events: auto; }
.back-top:hover { background: var(--glacier-deep); transform: translateY(-3px); }
.back-top svg { width: 20px; height: 20px; }

/* ============ Responsive ============ */
@media (max-width: 1080px) {
  .main-nav { display: none; }
  .nav-toggle { display: flex; }
  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--header-h);
    left: 0; right: 0;
    background: #fff;
    padding: 18px 32px 26px;
    box-shadow: var(--shadow-lg);
    border-bottom: 1px solid var(--line);
    gap: 2px;
    align-items: stretch;
  }
  .main-nav.open a { padding: 12px 8px; border-bottom: 1px solid var(--line); border-radius: 0; }
  .main-nav.open a.active::after { display: none; }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .logo-wall { grid-template-columns: repeat(3, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); gap: 36px 0; }
  .feature-split { grid-template-columns: 1fr; gap: 40px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
  .stat-item:nth-child(2)::after { display: none; }
}
@media (max-width: 640px) {
  .container { padding: 0 20px; }
  .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; }
  .logo-wall { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; }
  .step:not(:last-child)::after { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .topbar-links { display: none; }
  .hero-inner { padding: 64px 0 100px; }
  .section { padding: 64px 0; }
  .stats-grid { grid-template-columns: 1fr 1fr; padding: 32px 0; }
  .stat-item::after { display: none; }
  .stat-num { font-size: 34px; }
  .brand-title { font-size: 15px; }
  .quote-block { padding: 30px 26px; }
  .news-item { flex-direction: column; }
  .table-scroll { overflow-x: auto; }
  .data-table { min-width: 640px; }
}

/* ============ Utility ============ */
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; } .mt-16 { margin-top: 16px; } .mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; } .mt-48 { margin-top: 48px; }
.mb-24 { margin-bottom: 24px; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.hidden { display: none !important; }

/* Chinese/English display control */
[data-lang-zh], [data-lang-en] { display: none; }
body.zh [data-lang-zh] { display: revert; }
body.en [data-lang-en] { display: revert; }
body.zh [data-lang-zh].inline { display: inline; }
body.en [data-lang-en].inline { display: inline; }

/* ============ v2：品牌 Logo 与多级导航 ============ */
.brand-logo { height: 54px; width: 54px; border-radius: 50%; flex: none; box-shadow: 0 2px 10px rgba(13,48,73,.16); }
.brand .brand-text { display: flex; flex-direction: column; gap: 2px; }
.brand-line1 { font-size: 12.5px; color: var(--text-muted); letter-spacing: 4px; white-space: nowrap; }
.brand-line2 { font-size: 19px; font-weight: 800; color: var(--carbon); letter-spacing: 2px; white-space: nowrap; }
.footer-logo { height: 52px; width: 52px; box-shadow: 0 0 0 2px rgba(255,255,255,.14); }

.main-nav .nav-item { position: relative; }
.main-nav .nav-item > a { position: relative; }
.main-nav .submenu {
  position: absolute; top: 100%; left: 50%; transform: translate(-50%, 10px);
  min-width: 210px; background: var(--white); border: 1px solid var(--line);
  border-radius: 14px; box-shadow: 0 18px 44px rgba(13,48,73,.16);
  padding: 10px; opacity: 0; visibility: hidden; transition: all .22s ease; z-index: 80;
}
.main-nav .nav-item::after { content: ""; position: absolute; left: 0; right: 0; top: 100%; height: 14px; }
.main-nav .nav-item:hover .submenu,
.main-nav .nav-item:focus-within .submenu { opacity: 1; visibility: visible; transform: translate(-50%, 4px); }
.submenu a { display: block; padding: 9px 14px; border-radius: 9px; font-size: 14px; color: var(--text); white-space: nowrap; }
.submenu a:hover { background: var(--glacier-mist); color: var(--glacier-deep); }

/* ============ v2：栏目总览卡片 ============ */
.subnav-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.subnav-card { position: relative; display: block; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 30px 26px 26px; box-shadow: var(--shadow-sm); transition: all .25s ease; overflow: hidden; }
.subnav-card:hover { transform: translateY(-4px); box-shadow: 0 16px 36px rgba(13,48,73,.12); border-color: #BFDCEC; }
.subnav-num { font-size: 13px; font-weight: 800; color: var(--glacier); letter-spacing: 2px; margin-bottom: 12px; }
.subnav-card h3 { font-size: 18.5px; font-weight: 700; color: var(--carbon); margin-bottom: 10px; }
.subnav-card p { font-size: 14px; color: var(--text-muted); line-height: 1.65; margin-bottom: 18px; }
.subnav-go { display: inline-flex; width: 34px; height: 34px; border-radius: 50%; background: var(--glacier-mist); color: var(--glacier-deep); align-items: center; justify-content: center; transition: all .25s; }
.subnav-go svg { width: 16px; height: 16px; }
.subnav-card:hover .subnav-go { background: var(--glacier); color: #fff; transform: translateX(4px); }

@media (max-width: 1080px) {
  .main-nav .submenu { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: 0; background: transparent; padding: 0 0 8px 14px; min-width: 0; }
  .main-nav .nav-item::after { display: none; }
  .submenu a { color: var(--text-muted); padding: 8px 10px; }
  .submenu a:hover { color: var(--glacier-deep); background: var(--glacier-mist); }
}
@media (max-width: 900px) { .subnav-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) {
  .subnav-grid { grid-template-columns: 1fr; }
  .brand-line1 { letter-spacing: 2px; }
  .brand-line2 { font-size: 17px; }
  .brand-logo { height: 46px; width: 46px; }
}

/* ============ v2.1 首页 Hero 视觉与补缺组件 ============ */
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr); gap: 56px; align-items: center; }
.hero-visual { position: relative; display: flex; align-items: center; justify-content: center; min-width: 0; max-width: 100%; }
.hero-visual > svg, .hero-visual svg { max-width: 100%; }
.globe-wrap { position: relative; width: 100%; max-width: 430px; aspect-ratio: 1 / 1; margin: 0 auto; }
.globe-wrap svg { width: 100%; height: auto; max-height: 100%; display: block; }
.float-slow { animation: globeFloat 9s ease-in-out infinite; }
@keyframes globeFloat { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }
.arc-flow { stroke-dasharray: 7 11; animation: arcFlow 7s linear infinite; }
@keyframes arcFlow { to { stroke-dashoffset: -180; } }
.node-pulse { transform-box: fill-box; transform-origin: center; animation: nodePulse 3s ease-out infinite; }
.node-pulse.p2 { animation-delay: .9s; }
.node-pulse.p3 { animation-delay: 1.8s; }
@keyframes nodePulse { 0% { transform: scale(.62); opacity: .9; } 70% { transform: scale(1.55); opacity: 0; } 100% { opacity: 0; } }

.orbit-chip { position: absolute; display: inline-flex; align-items: center; gap: 8px; padding: 9px 15px; border-radius: 999px; background: rgba(255,255,255,.94); box-shadow: 0 10px 26px rgba(13,48,73,.15); font-size: 13px; font-weight: 600; color: var(--carbon); white-space: nowrap; z-index: 2; }
.orbit-chip i { width: 8px; height: 8px; border-radius: 50%; display: inline-block; flex: none; }
.chip-1 { top: 5%; left: -4%; animation: chipFloat 7s ease-in-out infinite; }
.chip-2 { bottom: 15%; right: -5%; animation: chipFloat 8.4s ease-in-out .6s infinite; }
.chip-3 { bottom: -1%; left: 3%; animation: chipFloat 9.6s ease-in-out 1.2s infinite; }
@keyframes chipFloat { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }

.nav-cards .card { position: relative; display: block; }
.card-num { font-size: 12px; font-weight: 800; letter-spacing: 2px; color: var(--glacier); margin-bottom: 14px; }

.story-video { position: relative; border-radius: var(--radius-lg); overflow: hidden; min-height: 400px; display: flex; flex-direction: column; justify-content: flex-end; background:
    radial-gradient(ellipse 420px 300px at 70% 15%, rgba(46,156,197,0.34), transparent 66%),
    radial-gradient(ellipse 380px 280px at 15% 80%, rgba(116,165,127,0.30), transparent 66%),
    linear-gradient(150deg, #0D3049, #14587C 58%, #1E5A45 100%);
  box-shadow: var(--shadow-md); }
.play-btn { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); width: 76px; height: 76px; border-radius: 50%; border: 0; cursor: pointer; background: rgba(255,255,255,.94); color: var(--glacier-deep); display: grid; place-items: center; box-shadow: 0 14px 34px rgba(0,0,0,.26); transition: transform .25s ease, background .25s ease; }
.play-btn svg { width: 28px; height: 28px; fill: currentColor; margin-left: 3px; }
.play-btn:hover { transform: translate(-50%, -50%) scale(1.07); background: #fff; }
.video-caption { position: relative; padding: 22px 26px; color: #fff; background: linear-gradient(to top, rgba(6,26,40,.88), rgba(6,26,40,.05)); display: flex; flex-direction: column; gap: 4px; }
.video-caption b { font-size: 16px; font-weight: 700; }
.video-caption span { font-size: 13px; color: rgba(255,255,255,.72); display: block; }

.dir-mini { display: flex; gap: 18px; align-items: flex-start; padding: 22px 24px; border: 1px solid var(--line); border-radius: 14px; background: var(--white); box-shadow: var(--shadow-sm); transition: all .25s ease; }
.dir-mini:hover { transform: translateY(-3px); border-color: #BFDCEC; box-shadow: 0 14px 32px rgba(13,48,73,.1); }
.dir-mini .idx { flex: none; width: 34px; height: 34px; border-radius: 10px; color: #fff; font-weight: 800; font-size: 15px; display: grid; place-items: center; }
.dir-mini h4 { font-size: 16.5px; font-weight: 700; color: var(--carbon); margin-bottom: 6px; }
.dir-mini p { font-size: 13.5px; color: var(--text-muted); line-height: 1.6; margin: 0; }

.map-node { cursor: pointer; transition: opacity .25s ease; }
.map-node:hover { opacity: .75; }
.d0 { transition-delay: 0s; }

@media (max-width: 1080px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { order: -1; }
  .globe-wrap { max-width: 360px; }
  .chip-1 { left: 0; }
  .chip-2 { right: 0; }
}
@media (max-width: 640px) {
  .globe-wrap { max-width: 300px; }
  .orbit-chip { font-size: 11.5px; padding: 7px 12px; }
  .story-video { min-height: 300px; }
  .play-btn { width: 62px; height: 62px; }
}

/* ============ v3 账号 / 会议 / 社区 ============ */
.header-login { display: inline-flex; align-items: center; padding: 8px 16px; border-radius: 999px; border: 1px solid var(--line); font-size: 13.5px; font-weight: 600; color: var(--glacier-deep); background: #fff; transition: all .2s; white-space: nowrap; }
.header-login:hover { background: var(--glacier-mist); border-color: #BFDCEC; }

.auth-grid { display: grid; grid-template-columns: 1.04fr .96fr; gap: 44px; align-items: start; }
.form-card { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); padding: 34px 32px; }
.form-row { display: grid; gap: 16px; }
.field { display: grid; gap: 7px; }
.field label { font-size: 13.5px; font-weight: 600; color: var(--carbon); }
.input { width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px; font-size: 14.5px; font-family: inherit; color: var(--carbon); background: #fff; transition: border-color .2s, box-shadow .2s; }
.input:focus { outline: none; border-color: var(--glacier); box-shadow: 0 0 0 3px rgba(27,107,147,.12); }
textarea.input { min-height: 130px; resize: vertical; line-height: 1.65; }
select.input { cursor: pointer; }
.btn-block { width: 100%; justify-content: center; }
.form-note { font-size: 12.5px; color: var(--text-muted); line-height: 1.6; }
.msg-bar { padding: 12px 16px; border-radius: 10px; font-size: 13.5px; margin-bottom: 18px; display: none; line-height: 1.6; }
.msg-bar.show { display: block; }
.msg-bar.ok { background: #E8F3EC; color: #1F5C3D; }
.msg-bar.err { background: #FDECEC; color: #B02A2A; }

.auth-side { background: linear-gradient(150deg, #0D3049, #14587C 60%, #1E5A45); color: #fff; border-radius: var(--radius-lg); padding: 34px 32px; box-shadow: var(--shadow-md); }
.auth-side h3 { font-size: 19px; margin-bottom: 16px; color: #fff; }
.auth-side ul { display: grid; gap: 13px; margin: 0; padding: 0; list-style: none; }
.auth-side li { font-size: 14px; color: rgba(255,255,255,.88); padding-left: 22px; position: relative; line-height: 1.6; }
.auth-side li::before { content: ""; position: absolute; left: 0; top: 8px; width: 8px; height: 8px; border-radius: 50%; background: #7BE495; }
.auth-side .auth-side-foot { margin-top: 24px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.16); font-size: 13px; color: rgba(255,255,255,.66); }

.event-card { display: grid; grid-template-columns: auto 1fr auto; gap: 24px; align-items: center; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 26px 30px; box-shadow: var(--shadow-sm); transition: all .25s; }
.event-card:hover { border-color: #BFDCEC; box-shadow: 0 14px 32px rgba(13,48,73,.09); }
.event-date { text-align: center; min-width: 84px; }
.event-date .d { font-size: 26px; font-weight: 800; color: var(--glacier-deep); line-height: 1.1; }
.event-date .m { font-size: 12.5px; color: var(--text-muted); letter-spacing: 1px; }
.event-main h3 { font-size: 18px; font-weight: 700; color: var(--carbon); margin-bottom: 8px; }
.event-main p { font-size: 14px; color: var(--text-muted); line-height: 1.65; margin-bottom: 10px; }
.event-meta { display: flex; flex-wrap: wrap; gap: 16px; font-size: 12.5px; color: var(--text-muted); }
.event-side { text-align: right; display: grid; gap: 10px; justify-items: end; }
.badge-soft { display: inline-flex; align-items: center; gap: 6px; padding: 5px 12px; border-radius: 999px; font-size: 12.5px; font-weight: 600; background: var(--glacier-mist); color: var(--glacier-deep); }
.badge-soft.green { background: #E8F3EC; color: #1F5C3D; }
.badge-soft.warn { background: #FFF4E5; color: #9A6212; }
.btn-sm { padding: 9px 18px; font-size: 13.5px; }

.post-item { display: block; background: var(--white); border: 1px solid var(--line); border-radius: 14px; padding: 22px 26px; transition: all .22s; }
.post-item:hover { border-color: #BFDCEC; box-shadow: 0 12px 28px rgba(13,48,73,.08); }
.post-item h3 { font-size: 17px; font-weight: 700; color: var(--carbon); margin-bottom: 8px; }
.post-item p { font-size: 13.5px; color: var(--text-muted); line-height: 1.65; margin-bottom: 12px; }
.post-meta { display: flex; flex-wrap: wrap; gap: 14px; font-size: 12.5px; color: var(--text-muted); }
.post-body { font-size: 15.5px; line-height: 1.9; color: var(--text); white-space: pre-wrap; }
.reply-item { background: #F7FBFD; border: 1px solid var(--line); border-radius: 12px; padding: 18px 22px; }
.reply-item .who { font-size: 13px; font-weight: 700; color: var(--glacier-deep); margin-bottom: 6px; }
.reply-item .body { font-size: 14.5px; line-height: 1.75; color: var(--text); white-space: pre-wrap; }
.empty-hint { text-align: center; padding: 48px 20px; color: var(--text-muted); font-size: 14.5px; background: var(--white); border: 1px dashed var(--line); border-radius: var(--radius-lg); }

.kv-list { display: grid; gap: 12px; }
.kv-list .kv { display: flex; justify-content: space-between; gap: 20px; font-size: 14px; padding-bottom: 12px; border-bottom: 1px dashed var(--line); }
.kv-list .kv:last-child { border-bottom: 0; padding-bottom: 0; }
.kv-list .k { color: var(--text-muted); }
.kv-list .v { font-weight: 600; color: var(--carbon); text-align: right; word-break: break-all; }

.toast { position: fixed; left: 50%; bottom: 36px; transform: translate(-50%, 18px); background: rgba(13,48,73,.95); color: #fff; padding: 12px 24px; border-radius: 999px; font-size: 14px; opacity: 0; pointer-events: none; transition: all .3s ease; z-index: 300; max-width: 86vw; text-align: center; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.err { background: #B02A2A; }
.table-simple { width: 100%; border-collapse: collapse; font-size: 13px; }
.table-simple th, .table-simple td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); }
.table-simple th { font-size: 12px; text-transform: uppercase; letter-spacing: 1px; color: var(--text-muted); }

@media (max-width: 900px) {
  .auth-grid { grid-template-columns: 1fr; gap: 28px; }
  .event-card { grid-template-columns: 1fr; gap: 16px; }
  .event-side { justify-items: start; text-align: left; }
  .header-login { display: none; }
}

/* ============ 备案号（footer-bottom） ============ */
.footer-bottom .footer-legal { display: inline-flex; align-items: center; }
.footer-bottom .footer-legal a { color: inherit; text-decoration: none; opacity: .9; transition: opacity .2s; }
.footer-bottom .footer-legal a:hover { opacity: 1; text-decoration: underline; }