/* ============================================================
   万利 (Wanli) 体育娱乐 AI 官网 — 全站样式
   Modern Sports Intelligence Lab + Broadcast Technology Studio
   ============================================================ */

:root {
  --color-bg: #FAF7F2;
  --color-bg-alt: #F1ECE3;
  --color-navy: #0E2A47;
  --color-navy-dark: #081A2E;
  --color-cyan: #12A6A0;
  --color-cyan-dark: #0C7C77;
  --color-orange: #F2762E;
  --color-graphite: #3D4247;
  --color-gray-mid: #6B7280;
  --color-line: #E4E0D8;
  --color-card: #FFFFFF;
  --color-white: #FFFFFF;

  --font-base: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

  --radius-s: 8px;
  --radius-m: 14px;
  --radius-l: 22px;

  --shadow-card: 0 4px 18px rgba(14, 42, 71, 0.08);
  --shadow-card-hover: 0 8px 28px rgba(14, 42, 71, 0.14);

  --container-max: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-base);
  background: var(--color-bg);
  color: var(--color-graphite);
  line-height: 1.85;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, svg { max-width: 100%; height: auto; display: block; }

a { color: var(--color-cyan-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3, h4 { color: var(--color-navy); font-weight: 700; margin: 0 0 16px; line-height: 1.4; }
h1 { font-size: 2.1rem; }
h2 { font-size: 1.6rem; }
h3 { font-size: 1.25rem; }
p { margin: 0 0 16px; }

.eyebrow {
  display: inline-block;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--color-cyan-dark);
  background: rgba(18, 166, 160, 0.1);
  border: 1px solid rgba(18, 166, 160, 0.28);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 14px;
  font-weight: 600;
}

/* ---------------- Header / Nav ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 500;
  background: rgba(250, 247, 242, 0.94);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--color-line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--color-navy);
}
.brand:hover { text-decoration: none; }
.brand .logo-mark { width: 34px; height: 34px; flex: none; }
.brand .brand-sub {
  font-size: 0.68rem;
  font-weight: 500;
  color: var(--color-gray-mid);
  display: block;
  margin-top: 1px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 2px;
}

.main-nav a {
  color: var(--color-navy);
  font-size: 0.94rem;
  font-weight: 600;
  padding: 10px 13px;
  border-radius: 8px;
  white-space: nowrap;
}
.main-nav a:hover { background: var(--color-bg-alt); text-decoration: none; }
.main-nav a.active { color: var(--color-cyan-dark); background: rgba(18,166,160,0.12); }

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  background: var(--color-white);
  cursor: pointer;
  position: relative;
}
.nav-toggle span, .nav-toggle::before, .nav-toggle::after {
  content: "";
  position: absolute;
  left: 9px; right: 9px;
  height: 2px;
  background: var(--color-navy);
}
.nav-toggle::before { top: 13px; }
.nav-toggle span { top: 19px; }
.nav-toggle::after { top: 25px; }

/* ---------------- Hero ---------------- */
.hero {
  padding: 56px 0 44px;
  background: linear-gradient(180deg, #FFFFFF 0%, var(--color-bg) 100%);
  border-bottom: 1px solid var(--color-line);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 44px;
  align-items: center;
}
.hero h1 { font-size: 2.3rem; margin-bottom: 18px; }
.hero-lead { font-size: 1.03rem; color: var(--color-graphite); }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 22px; }
.hero-figure {
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-l);
  padding: 18px;
  box-shadow: var(--shadow-card);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  border: 1.5px solid transparent;
  cursor: pointer;
}
.btn-primary { background: var(--color-navy); color: #fff; }
.btn-primary:hover { background: var(--color-navy-dark); text-decoration: none; }
.btn-outline { background: transparent; color: var(--color-navy); border-color: var(--color-navy); }
.btn-outline:hover { background: var(--color-navy); color: #fff; text-decoration: none; }
.btn-cyan { background: var(--color-cyan); color: #fff; }
.btn-cyan:hover { background: var(--color-cyan-dark); text-decoration: none; }

/* ---------------- Section shells ---------------- */
.section { padding: 56px 0; }
.section-alt { background: var(--color-bg-alt); }
.section-navy { background: var(--color-navy); color: #EDEFF2; }
.section-navy h2, .section-navy h3 { color: #fff; }
.section-navy .section-desc { color: #C7D0DA; }
.section-head { max-width: 760px; margin: 0 auto 34px; text-align: center; }
.section-head.left { margin: 0 0 34px; text-align: left; }
.section-desc { color: var(--color-gray-mid); font-size: 1rem; }

/* ---------------- TOC ---------------- */
.toc-nav {
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-m);
  padding: 18px 22px;
  margin: 32px 0 0;
}
.toc-nav h2 { font-size: 1.05rem; margin-bottom: 12px; }
.toc-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  list-style: none;
  padding: 0;
  margin: 0;
}
.toc-list a {
  display: inline-block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-navy);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-line);
  padding: 7px 13px;
  border-radius: 999px;
}
.toc-list a:hover { background: var(--color-cyan); color: #fff; text-decoration: none; }

/* ---------------- Diagram figure ---------------- */
.figure {
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-m);
  padding: 16px;
  margin: 22px 0;
  box-shadow: var(--shadow-card);
}
.figure img { border-radius: 6px; }
.figure figcaption {
  font-size: 0.85rem;
  color: var(--color-gray-mid);
  margin-top: 10px;
  text-align: center;
}

/* ---------------- Long-form article blocks ---------------- */
.article-block {
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-l);
  padding: 34px 36px;
  margin-bottom: 30px;
  box-shadow: var(--shadow-card);
  scroll-margin-top: 90px;
}
.article-block .article-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-orange);
  background: rgba(242, 118, 46, 0.1);
  border: 1px solid rgba(242, 118, 46, 0.3);
  padding: 3px 11px;
  border-radius: 999px;
  margin-bottom: 14px;
}
.article-block h2 { font-size: 1.42rem; }
.article-block .article-index {
  color: var(--color-cyan-dark);
  font-weight: 800;
  margin-right: 8px;
}
.article-body p { color: var(--color-graphite); }
.article-body strong { color: var(--color-navy); }
.article-meta {
  font-size: 0.82rem;
  color: var(--color-gray-mid);
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px dashed var(--color-line);
}

/* ---------------- Observation cards ---------------- */
.observation-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.observation-card {
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-m);
  padding: 24px;
  box-shadow: var(--shadow-card);
}
.observation-card h3 { font-size: 1.05rem; }
.observation-card .obs-body { font-size: 0.94rem; color: var(--color-graphite); }

/* ---------------- Summary clusters (21 articles rollup) ---------------- */
.cluster {
  margin-bottom: 40px;
}
.cluster-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
  border-left: 4px solid var(--color-cyan);
  padding-left: 14px;
}
.cluster-head h3 { margin: 0; font-size: 1.15rem; }
.cluster-head .cluster-link { font-size: 0.88rem; font-weight: 700; }
.summary-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.summary-card {
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-m);
  padding: 20px;
  transition: box-shadow .2s, transform .2s;
}
.summary-card:hover { box-shadow: var(--shadow-card-hover); transform: translateY(-2px); }
.summary-card h4 { font-size: 1rem; margin-bottom: 8px; }
.summary-card h4 a { color: var(--color-navy); }
.summary-body { font-size: 0.88rem; color: var(--color-gray-mid); margin-bottom: 0; }
.summary-card .read-more { font-size: 0.84rem; font-weight: 700; display: inline-block; margin-top: 10px; }

/* ---------------- Feature cards (function grids) ---------------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.feature-card {
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-m);
  padding: 20px 18px;
  text-align: left;
}
.feature-card .feature-num {
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--color-cyan-dark);
  margin-bottom: 8px;
  display: block;
}
.feature-card h4 { font-size: 1rem; margin-bottom: 6px; }
.feature-card p { font-size: 0.86rem; color: var(--color-gray-mid); margin: 0; }

/* ---------------- FAQ ---------------- */
.faq-list { max-width: 880px; margin: 0 auto; }
.faq-item {
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-m);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-q {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 18px 22px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-navy);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-family: var(--font-base);
}
.faq-q .icon { flex: none; font-size: 1.2rem; color: var(--color-cyan-dark); transition: transform .2s; }
.faq-item.open .faq-q .icon { transform: rotate(45deg); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height .25s ease;
  padding: 0 22px;
  font-size: 0.92rem;
  color: var(--color-graphite);
}
.faq-item.open .faq-a { max-height: 400px; padding: 0 22px 20px; }

/* ---------------- Company / about ---------------- */
.about-box {
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-l);
  padding: 32px 36px;
}

/* ---------------- Boundary notice ---------------- */
.notice-box {
  background: rgba(18, 166, 160, 0.07);
  border: 1px solid rgba(18, 166, 160, 0.3);
  border-radius: var(--radius-m);
  padding: 18px 22px;
  font-size: 0.9rem;
  color: var(--color-navy);
  margin: 20px 0;
}
.notice-box strong { color: var(--color-cyan-dark); }

/* ---------------- Tabs (used on some pages) ---------------- */
.tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 22px; }
.tab-btn {
  padding: 9px 18px;
  border-radius: 999px;
  border: 1.5px solid var(--color-line);
  background: var(--color-white);
  color: var(--color-navy);
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  font-family: var(--font-base);
}
.tab-btn.active { background: var(--color-navy); color: #fff; border-color: var(--color-navy); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ---------------- Footer ---------------- */
.site-footer {
  background: var(--color-navy-dark);
  color: #C7D0DA;
  padding: 46px 0 26px;
  margin-top: 20px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 30px;
  margin-bottom: 30px;
}
.footer-brand { font-weight: 800; color: #fff; font-size: 1.15rem; margin-bottom: 10px; }
.footer-desc { font-size: 0.86rem; color: #9AAAB8; }
.footer-col h5 { color: #fff; font-size: 0.92rem; margin-bottom: 12px; }
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: 9px; }
.footer-col a { color: #AEBBC7; font-size: 0.88rem; }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 20px;
  font-size: 0.82rem;
  color: #8393A2;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------------- Back to top ---------------- */
.back-top {
  position: fixed;
  right: 22px;
  bottom: 26px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--color-navy);
  color: #fff;
  border: none;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: var(--shadow-card);
  z-index: 400;
}
.back-top.show { display: flex; }

/* ---------------- Utility ---------------- */
.mt-0 { margin-top: 0; }
.text-center { text-align: center; }
.tag-row { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 18px; }
.pill {
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 11px;
  border-radius: 999px;
  background: var(--color-bg-alt);
  color: var(--color-navy);
  border: 1px solid var(--color-line);
}

/* ---------------- Responsive ---------------- */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; }
  .observation-grid { grid-template-columns: 1fr; }
  .summary-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  .main-nav { display: none; }
  .nav-toggle { display: block; }
  .site-header.nav-open .main-nav {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px; left: 0; right: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-line);
    padding: 10px 20px 18px;
    gap: 4px;
  }
  .hero h1 { font-size: 1.6rem; }
  h2 { font-size: 1.32rem; }
  .article-block { padding: 24px 20px; }
  .summary-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 22px; }
  .container { padding: 0 16px; }
}

@media (max-width: 400px) {
  body { font-size: 15px; }
  .hero { padding: 38px 0 30px; }
}