/* ============================================
   Polymarket 中文百科 - 共享样式
   ============================================ */

:root {
  --color-bg: #f7f8fa;
  --color-surface: #ffffff;
  --color-navy: #0e1726;
  --color-navy-soft: #1b2740;
  --color-primary: #1652f0;
  --color-primary-dark: #0f3fc0;
  --color-accent: #00b8a9;
  --color-text: #1c2733;
  --color-muted: #5b6775;
  --color-border: #e5e8ee;
  --color-border-strong: #d4d9e2;
  --radius: 12px;
  --shadow-sm: 0 1px 2px rgba(14, 23, 38, 0.06);
  --shadow-md: 0 6px 20px rgba(14, 23, 38, 0.08);
  --maxw: 1120px;
}

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

html {
  scroll-behavior: smooth;
  background: var(--color-bg);
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 18px;
  color: var(--color-navy);
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--color-primary);
  color: #fff;
  font-weight: 800;
  font-size: 16px;
}

.brand-sub {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-muted);
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-links a {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 8px;
  color: var(--color-text);
  font-size: 15px;
  font-weight: 500;
}

.nav-links a:hover {
  background: var(--color-bg);
  text-decoration: none;
}

.nav-links a.active {
  color: var(--color-primary);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-navy);
  border-radius: 2px;
}

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(180deg, var(--color-navy) 0%, var(--color-navy-soft) 100%);
  color: #fff;
  padding: 72px 0 80px;
}

.hero .badge {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(22, 82, 240, 0.18);
  border: 1px solid rgba(22, 82, 240, 0.4);
  color: #9db8ff;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(30px, 5vw, 48px);
  line-height: 1.2;
  font-weight: 800;
  max-width: 760px;
  text-wrap: balance;
}

.hero p.lead {
  margin-top: 18px;
  font-size: clamp(16px, 2.2vw, 19px);
  color: #b9c2d0;
  max-width: 640px;
}

.hero-actions {
  margin-top: 32px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.08s ease, background 0.15s ease;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
}

.btn-ghost {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.25);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
}

.btn-outline {
  background: var(--color-surface);
  color: var(--color-primary);
  border-color: var(--color-border-strong);
}

.btn-outline:hover {
  border-color: var(--color-primary);
}

/* ---------- Sections ---------- */
.section {
  padding: 64px 0;
}

.section-head {
  max-width: 640px;
  margin-bottom: 40px;
}

.section-head .kicker {
  color: var(--color-primary);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.section-head h2 {
  margin-top: 8px;
  font-size: clamp(24px, 3.5vw, 34px);
  font-weight: 800;
  color: var(--color-navy);
  text-wrap: balance;
}

.section-head p {
  margin-top: 12px;
  color: var(--color-muted);
  font-size: 17px;
}

/* ---------- Grid & Cards ---------- */
.grid {
  display: grid;
  gap: 20px;
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.18s ease, transform 0.18s ease;
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card .icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(22, 82, 240, 0.1);
  color: var(--color-primary);
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 16px;
}

.card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 8px;
}

.card p {
  color: var(--color-muted);
  font-size: 15px;
}

.card-link {
  background: var(--color-surface);
  display: block;
}

.card-link:hover {
  text-decoration: none;
}

.card-link .more {
  display: inline-block;
  margin-top: 14px;
  color: var(--color-primary);
  font-weight: 600;
  font-size: 14px;
}

/* ---------- Stats ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.stat {
  text-align: center;
}

.stat .num {
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 800;
  color: #fff;
}

.stat .label {
  color: #93a0b4;
  font-size: 14px;
  margin-top: 4px;
}

/* ---------- Article Layout ---------- */
.page-header {
  background: var(--color-navy);
  color: #fff;
  padding: 56px 0;
}

.page-header .crumb {
  color: #8d9bb2;
  font-size: 14px;
  margin-bottom: 14px;
}

.page-header .crumb a {
  color: #b9c2d0;
}

.page-header h1 {
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 800;
  text-wrap: balance;
}

.page-header p {
  margin-top: 12px;
  color: #b9c2d0;
  font-size: 17px;
  max-width: 680px;
}

.layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 48px;
  padding: 48px 0 80px;
}

.toc {
  position: sticky;
  top: 88px;
  align-self: start;
}

.toc h4 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.toc ul {
  list-style: none;
  border-left: 2px solid var(--color-border);
}

.toc li a {
  display: block;
  padding: 6px 14px;
  color: var(--color-text);
  font-size: 14px;
  border-left: 2px solid transparent;
  margin-left: -2px;
}

.toc li a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.article {
  min-width: 0;
}

.article h2 {
  font-size: 26px;
  font-weight: 800;
  color: var(--color-navy);
  margin: 40px 0 16px;
  scroll-margin-top: 88px;
}

.article h2:first-child {
  margin-top: 0;
}

.article h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-navy);
  margin: 28px 0 12px;
}

.article p {
  margin: 14px 0;
  color: #2c3744;
  font-size: 16.5px;
}

.article ul,
.article ol {
  margin: 14px 0;
  padding-left: 22px;
  color: #2c3744;
}

.article li {
  margin: 8px 0;
}

.article strong {
  color: var(--color-navy);
}

.callout {
  border-left: 4px solid var(--color-primary);
  background: rgba(22, 82, 240, 0.06);
  padding: 16px 20px;
  border-radius: 8px;
  margin: 22px 0;
  color: #2c3744;
}

.callout.warn {
  border-left-color: #e0a000;
  background: rgba(224, 160, 0, 0.08);
}

.callout .title {
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 4px;
}

/* ---------- Table ---------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin: 22px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  background: var(--color-surface);
}

th,
td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
}

th {
  background: var(--color-bg);
  color: var(--color-navy);
  font-weight: 700;
  white-space: nowrap;
}

tr:last-child td {
  border-bottom: none;
}

/* ---------- Glossary ---------- */
.glossary-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin-bottom: 14px;
  box-shadow: var(--shadow-sm);
}

.glossary-item .term {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-navy);
}

.glossary-item .en {
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 500;
  margin-left: 8px;
}

.glossary-item p {
  margin-top: 8px;
  color: var(--color-muted);
  font-size: 15px;
}

/* ---------- FAQ ---------- */
.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 22px;
  font-weight: 600;
  font-size: 16.5px;
  color: var(--color-navy);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  font-size: 22px;
  color: var(--color-primary);
  font-weight: 400;
  transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item .answer {
  padding: 0 22px 20px;
  color: var(--color-muted);
  font-size: 15.5px;
}

/* ---------- Steps ---------- */
.steps {
  counter-reset: step;
  display: grid;
  gap: 16px;
}

.step {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 22px 24px 22px 64px;
  position: relative;
  box-shadow: var(--shadow-sm);
}

.step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 20px;
  top: 22px;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  font-size: 15px;
}

.step h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 4px;
}

.step p {
  color: var(--color-muted);
  font-size: 15px;
}

/* ---------- CTA band ---------- */
.cta {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  border-radius: 18px;
  padding: 48px;
  color: #fff;
  text-align: center;
}

.cta h2 {
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  margin-bottom: 12px;
}

.cta p {
  color: rgba(255, 255, 255, 0.85);
  max-width: 560px;
  margin: 0 auto 24px;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-navy);
  color: #b9c2d0;
  padding: 56px 0 32px;
  margin-top: 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 32px;
}

.footer-grid h5 {
  color: #fff;
  font-size: 15px;
  margin-bottom: 14px;
}

.footer-grid ul {
  list-style: none;
}

.footer-grid li {
  margin: 8px 0;
}

.footer-grid a {
  color: #93a0b4;
  font-size: 14px;
}

.footer-grid a:hover {
  color: #fff;
}

.footer-about p {
  color: #93a0b4;
  font-size: 14px;
  margin-top: 12px;
  max-width: 320px;
}

.footer-bottom {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 13px;
  color: #7a8699;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.disclaimer {
  background: rgba(224, 160, 0, 0.08);
  border: 1px solid rgba(224, 160, 0, 0.25);
  border-radius: var(--radius);
  padding: 18px 22px;
  color: #6b5500;
  font-size: 14px;
  margin: 24px 0;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .toc {
    position: static;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 18px;
    background: var(--color-surface);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .nav-toggle {
    display: flex;
  }
  .nav-links {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 8px;
    display: none;
    box-shadow: var(--shadow-md);
  }
  .nav-links.open {
    display: flex;
  }
  .grid-3,
  .grid-4,
  .grid-2 {
    grid-template-columns: 1fr;
  }
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .cta {
    padding: 32px 24px;
  }
  .section {
    padding: 48px 0;
  }
}