@import url("https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;600;700;900&family=ZCOOL+XiaoWei&display=swap");

:root {
  --blue: #1e6fd9;
  --blue-deep: #0d4ea8;
  --blue-soft: #e8f1fc;
  --blue-mid: #3d8aef;
  --ink: #1a2332;
  --muted: #5a6577;
  --line: #e6ebf2;
  --bg: #f5f7fb;
  --white: #ffffff;
  --shadow: 0 8px 28px rgba(13, 78, 168, 0.08);
  --radius: 12px;
  --header-h: 72px;
  --font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --display: "ZCOOL XiaoWei", "Noto Sans SC", serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
.container { width: min(1200px, calc(100% - 40px)); margin: 0 auto; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}
.header-inner {
  display: flex; align-items: center; gap: 20px;
  min-height: var(--header-h);
}
.brand {
  display: flex; align-items: center; gap: 10px;
  flex-shrink: 0;
}
.brand-mark {
  width: 42px; height: 42px; border-radius: 50%;
  background: linear-gradient(145deg, var(--blue-mid), var(--blue-deep));
  display: grid; place-items: center; color: #fff; font-weight: 900;
  font-size: 0.85rem; letter-spacing: -0.02em;
  box-shadow: 0 4px 12px rgba(30, 111, 217, 0.35);
}
.brand-text strong {
  display: block; font-size: 1.15rem; font-weight: 700; line-height: 1.2;
}
.brand-text span {
  display: block; font-size: 0.68rem; color: var(--muted); line-height: 1.35;
  max-width: 220px;
}
.nav {
  display: flex; gap: 4px; flex: 1; justify-content: center; flex-wrap: wrap;
}
.nav a {
  padding: 8px 12px; border-radius: 8px; color: #334155;
  font-size: 0.95rem; font-weight: 500;
}
.nav a:hover, .nav a.is-active { color: var(--blue); background: var(--blue-soft); }
.nav-drop { position: relative; }
.nav-drop > a::after { content: " ▾"; font-size: 0.7em; }
.nav-drop-menu {
  display: none; position: absolute; top: 100%; left: 0; min-width: 160px;
  background: #fff; border: 1px solid var(--line); border-radius: 10px;
  box-shadow: var(--shadow); padding: 8px; z-index: 20;
}
.nav-drop:hover .nav-drop-menu { display: grid; gap: 2px; }
.nav-drop-menu a { padding: 8px 12px; border-radius: 6px; font-size: 0.9rem; }
.header-actions { display: flex; gap: 10px; flex-shrink: 0; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 10px 18px; border-radius: 8px; border: 1px solid transparent;
  font-size: 0.92rem; font-weight: 600; transition: 0.2s ease;
}
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-deep); }
.btn-outline {
  background: #fff; color: var(--blue); border-color: var(--blue);
}
.btn-outline:hover { background: var(--blue-soft); }
.btn-light { background: rgba(255,255,255,0.18); color: #fff; border-color: rgba(255,255,255,0.45); }
.btn-light:hover { background: rgba(255,255,255,0.28); }
.btn-lg { padding: 14px 28px; font-size: 1rem; }

/* Hero carousel */
.hero {
  position: relative; min-height: min(58vh, 520px);
  color: #fff; overflow: hidden;
  background: #0b3d8c;
}
.hero-slides { position: absolute; inset: 0; }
.hero-slide {
  position: absolute; inset: 0; opacity: 0;
  transition: opacity 0.7s ease;
  background-size: cover; background-position: center;
}
.hero-slide.is-active { opacity: 1; }
.hero-slide::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(8,45,110,0.88) 0%, rgba(13,78,168,0.55) 55%, rgba(13,78,168,0.25) 100%);
}
.hero-content {
  position: relative; z-index: 2;
  padding: 88px 0 72px;
  max-width: 640px;
}
.hero-kicker {
  display: inline-block; padding: 6px 12px; border-radius: 999px;
  background: rgba(255,255,255,0.15); font-size: 0.85rem; margin-bottom: 16px;
}
.hero h1 {
  font-family: var(--display);
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 400; line-height: 1.15; margin: 0 0 16px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.2);
}
.hero p { margin: 0 0 28px; font-size: 1.05rem; opacity: 0.95; max-width: 32rem; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-dots {
  position: absolute; bottom: 20px; left: 50%; transform: translateX(-50%);
  z-index: 3; display: flex; gap: 8px;
}
.hero-dots button {
  width: 10px; height: 10px; border-radius: 50%; border: 0;
  background: rgba(255,255,255,0.45);
}
.hero-dots button.is-active { background: #fff; width: 24px; border-radius: 999px; }

/* Stats */
.stats {
  background: #fff; border-bottom: 1px solid var(--line);
  padding: 28px 0;
}
.stats-grid {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; text-align: center;
}
.stats-grid.lab-stats {
  grid-template-columns: repeat(3, 1fr);
  max-width: 720px;
  margin: 0 auto 28px;
}
.stat-item { padding: 8px; }
.stat-icon {
  width: 48px; height: 48px; margin: 0 auto 10px; border-radius: 50%;
  background: var(--blue-soft); color: var(--blue);
  display: grid; place-items: center; font-size: 1.2rem;
}
.stat-num {
  font-size: 1.75rem; font-weight: 800; color: var(--blue-deep); line-height: 1.1;
}
.stat-label { color: var(--muted); font-size: 0.9rem; margin-top: 4px; }

/* Sections */
.section { padding: 56px 0; }
.section-alt { background: #fff; }
.section-head { text-align: center; margin-bottom: 32px; }
.section-head h2 {
  margin: 0 0 10px; font-size: clamp(1.4rem, 2.5vw, 1.85rem); font-weight: 700;
}
.section-head p { margin: 0; color: var(--muted); }

/* Pillar tabs */
.pillars-tabs {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 24px;
}
.pillar-tab {
  border: 1px solid var(--line); background: #fff; border-radius: 10px;
  padding: 18px 16px; text-align: left; font-weight: 600; color: var(--ink);
}
.pillar-tab.is-active {
  background: var(--blue); color: #fff; border-color: var(--blue);
  box-shadow: 0 8px 20px rgba(30,111,217,0.25);
}
.pillar-panel {
  display: none; background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow);
}
.pillar-panel.is-active { display: grid; grid-template-columns: 280px 1fr; min-height: 320px; }
.pillar-side { background: #f8fbff; border-right: 1px solid var(--line); padding: 12px; }
.pillar-side button {
  display: block; width: 100%; text-align: left; border: 0; background: transparent;
  padding: 14px 14px; border-radius: 8px; margin-bottom: 4px;
}
.pillar-side button strong { display: block; font-size: 0.95rem; }
.pillar-side button span { display: block; font-size: 0.8rem; color: var(--muted); margin-top: 4px; }
.pillar-side button.is-active { background: var(--blue-soft); color: var(--blue-deep); }
.pillar-side button.is-active span { color: var(--blue); }
.pillar-main {
  padding: 28px; background:
    linear-gradient(135deg, rgba(30,111,217,0.06), transparent 50%),
    #fff;
}
.pillar-main h3 { margin: 0 0 12px; font-size: 1.25rem; }
.pillar-main p { color: var(--muted); margin: 0 0 20px; }
.pillar-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.tag {
  display: inline-flex; padding: 4px 10px; border-radius: 999px;
  background: var(--blue-soft); color: var(--blue-deep); font-size: 0.8rem;
}

/* Cards grid */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow); transition: transform 0.2s, box-shadow 0.2s;
  display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 14px 32px rgba(13,78,168,0.12); }
.card-cover {
  height: 140px; background-size: cover; background-position: center;
  position: relative;
}
.card-badge {
  position: absolute; left: 12px; top: 12px;
  background: var(--blue); color: #fff; font-size: 0.75rem;
  padding: 4px 10px; border-radius: 999px; font-weight: 600;
}
.card-body { padding: 16px 18px 18px; flex: 1; display: flex; flex-direction: column; }
.card-body h3 { margin: 0 0 8px; font-size: 1.05rem; line-height: 1.4; }
.card-meta { color: var(--muted); font-size: 0.85rem; margin: 0 0 12px; }
.card-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: auto; }
.card-tags span {
  font-size: 0.75rem; color: var(--muted); background: var(--bg);
  padding: 3px 8px; border-radius: 6px;
}

/* Resource strip */
.resource-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
.resource-card {
  background: linear-gradient(160deg, var(--blue) 0%, var(--blue-deep) 100%);
  color: #fff; border-radius: var(--radius); padding: 22px 18px;
  min-height: 140px; display: flex; flex-direction: column; justify-content: space-between;
  box-shadow: var(--shadow);
}
.resource-card h3 { margin: 0; font-size: 1.05rem; }
.resource-card span { opacity: 0.85; font-size: 0.85rem; }

/* Cases */
.case-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.case-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden;
}
.case-card .cover { height: 120px; background-size: cover; background-position: center; }
.case-card .body { padding: 14px; }
.case-card h3 { margin: 0 0 6px; font-size: 0.98rem; }
.case-card p { margin: 0; color: var(--muted); font-size: 0.85rem; }

/* Quotes */
.quotes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.quote {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow);
}
.quote p { margin: 0 0 14px; color: #334155; }
.quote footer { color: var(--muted); font-size: 0.85rem; }

/* School CTA */
.school-cta {
  background: linear-gradient(120deg, #0d4ea8, #1e6fd9 50%, #3d8aef);
  color: #fff; border-radius: 16px; padding: 40px 36px;
  display: grid; grid-template-columns: 1.4fr 1fr; gap: 24px; align-items: center;
}
.school-cta h2 { margin: 0 0 12px; font-size: 1.6rem; }
.school-cta p { margin: 0 0 20px; opacity: 0.92; }
.school-steps { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 20px; }
.school-steps span {
  background: rgba(255,255,255,0.15); padding: 8px 14px; border-radius: 999px; font-size: 0.9rem;
}
.school-note { font-size: 0.85rem; opacity: 0.8; margin-top: 10px; }

/* News list */
.news-list { display: grid; gap: 12px; }
.news-item {
  display: grid; grid-template-columns: 110px 1fr auto; gap: 16px; align-items: center;
  background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 16px 18px;
}
.news-item time { color: var(--blue); font-weight: 600; font-size: 0.9rem; }
.news-item h3 { margin: 0; font-size: 1rem; font-weight: 600; }
.news-item p { margin: 4px 0 0; color: var(--muted); font-size: 0.88rem; }

/* Page banner (inner) */
.page-banner {
  background: linear-gradient(120deg, #0d4ea8, #1e6fd9);
  color: #fff; padding: 48px 0 40px;
}
.page-banner h1 { margin: 0 0 8px; font-size: 1.85rem; }
.page-banner p { margin: 0; opacity: 0.9; }

/* Filters */
.toolbar {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center;
  margin: 24px 0 20px;
}
.chip {
  border: 1px solid var(--line); background: #fff; border-radius: 999px;
  padding: 8px 14px; font-size: 0.88rem; color: var(--muted);
}
.chip.is-active { background: var(--blue); color: #fff; border-color: var(--blue); }
.search-box {
  margin-left: auto; display: flex; gap: 8px;
}
.search-box input {
  border: 1px solid var(--line); border-radius: 8px; padding: 9px 12px;
  min-width: 200px; font: inherit;
}

/* Footer */
.site-footer {
  background: #0f1b2d; color: #c5d0e0; padding: 48px 0 28px; margin-top: 24px;
}
.footer-grid {
  display: grid; grid-template-columns: 1.3fr repeat(4, 1fr); gap: 24px;
  margin-bottom: 32px;
}
.footer-brand strong { color: #fff; font-size: 1.1rem; display: block; margin-bottom: 10px; }
.footer-col h4 { color: #fff; margin: 0 0 12px; font-size: 0.95rem; }
.footer-col a { display: block; margin-bottom: 8px; font-size: 0.88rem; opacity: 0.85; }
.footer-col a:hover { opacity: 1; color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1); padding-top: 18px;
  font-size: 0.82rem; opacity: 0.75; display: flex; flex-wrap: wrap; gap: 12px 20px;
}

/* Float tools */
.float-tools {
  position: fixed; right: 16px; bottom: 80px; z-index: 90;
  display: grid; gap: 8px;
}
.float-tools a {
  width: 52px; background: #fff; border: 1px solid var(--line);
  border-radius: 10px; padding: 10px 6px; text-align: center;
  font-size: 0.7rem; color: var(--muted); box-shadow: var(--shadow);
}
.float-tools a:hover { color: var(--blue); }
.float-tools .ico { font-size: 1.2rem; display: block; margin-bottom: 4px; }

/* About / cooperation */
.prose { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }
.prose h2 { margin-top: 0; }
.prose h3 { margin: 24px 0 10px; }
.prose p, .prose li { color: #3d4a5c; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 20px; }
.feature-grid article {
  background: var(--blue-soft); border-radius: 10px; padding: 18px;
}
.feature-grid h3 { margin: 0 0 8px; color: var(--blue-deep); }
.feature-grid p { margin: 0; color: var(--muted); font-size: 0.92rem; }

.empty {
  text-align: center; padding: 48px; color: var(--muted);
  background: #fff; border: 1px dashed var(--line); border-radius: var(--radius);
}

@media (max-width: 1024px) {
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
  .cards, .quotes { grid-template-columns: repeat(2, 1fr); }
  .resource-grid { grid-template-columns: repeat(3, 1fr); }
  .case-grid { grid-template-columns: repeat(2, 1fr); }
  .pillar-panel.is-active { grid-template-columns: 1fr; }
  .pillar-side { border-right: 0; border-bottom: 1px solid var(--line); }
  .school-cta { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .nav { display: none; }
  .brand-text span { display: none; }
  .stats-grid, .cards, .quotes, .resource-grid, .case-grid, .pillars-tabs, .feature-grid {
    grid-template-columns: 1fr;
  }
  .news-item { grid-template-columns: 1fr; }
  .search-box { margin-left: 0; width: 100%; }
  .search-box input { flex: 1; }
  .footer-grid { grid-template-columns: 1fr; }
}