:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel-soft: #1f2430;
  --text: #eef2f7;
  --muted: #b6bfd0;
  --line: #2e3544;
  --brand: #ff9d10;
  --brand-dark: #d97d00;
  --accent: #ffce73;
  --max-width: 1180px;
  --radius: 20px;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top right, rgba(255, 157, 16, 0.15), transparent 28%),
    linear-gradient(180deg, #0e1015 0%, #11141b 100%);
  line-height: 1.75;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.container {
  width: min(var(--max-width), calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(15, 17, 21, 0.86);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 78px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand img {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  box-shadow: var(--shadow);
}

.brand small {
  display: block;
  color: var(--muted);
  font-weight: 500;
  font-size: 12px;
}

.brand strong {
  display: block;
}

.mobile-menu {
  display: none;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: flex-end;
}

.nav-links a,
.footer-links a {
  color: var(--muted);
  padding: 8px 12px;
  border-radius: 999px;
  transition: 0.2s ease;
}

.nav-links a:hover,
.footer-links a:hover,
.inline-links a:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.hero {
  padding: 72px 0 36px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 30px;
  align-items: center;
}

.hero-copy h1 {
  margin: 0 0 18px;
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.1;
}

.hero-copy p {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 17px;
}

.badge-row,
.cta-row,
.tag-list,
.card-grid,
.footer-links,
.info-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--accent);
  font-size: 14px;
}

.cta-row {
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  transition: 0.2s ease;
}

.button-primary {
  background: var(--brand);
  color: #161616;
}

.button-primary:hover {
  background: #ffb240;
}

.button-secondary {
  border-color: rgba(255, 255, 255, 0.12);
  color: var(--text);
}

.button-secondary:hover {
  background: rgba(255, 255, 255, 0.06);
}

.hero-card,
.section-card,
.legal-card,
.error-card {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.02));
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 24px;
}

.hero-card img {
  border-radius: 18px;
  margin-bottom: 18px;
}

.hero-card h2,
.section-head h2,
.legal-card h1,
.error-card h1 {
  margin: 0 0 12px;
}

.hero-card p,
.section-head p,
.section-card p,
.legal-card p,
.legal-card li,
.error-card p {
  color: var(--muted);
}

main section {
  padding: 30px 0;
}

.section-head {
  max-width: 860px;
  margin-bottom: 22px;
}

.section-head h2 {
  font-size: clamp(28px, 4vw, 40px);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.section-card {
  padding: 24px;
}

.section-card h3 {
  margin-top: 0;
  margin-bottom: 12px;
  font-size: 22px;
}

.section-card ul,
.legal-card ul {
  margin: 0;
  padding-left: 20px;
}

.content-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 20px;
}

.article {
  padding: 28px;
}

.article h2,
.article h3 {
  margin-top: 0;
}

.article h3 {
  margin-top: 28px;
  font-size: 24px;
}

.article p {
  margin: 0 0 18px;
}

.sidebar {
  display: grid;
  gap: 18px;
  align-content: start;
}

.mini-card {
  padding: 22px;
}

.mini-card h3 {
  margin: 0 0 12px;
}

.mini-card ul {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
}

.tag-list span {
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 157, 16, 0.12);
  color: var(--accent);
  font-size: 14px;
}

.faq-list {
  display: grid;
  gap: 16px;
}

.faq-item {
  padding: 22px;
}

.faq-item h3 {
  margin: 0 0 10px;
  font-size: 20px;
}

.site-footer {
  padding: 34px 0 48px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  margin-top: 28px;
}

.site-footer p {
  color: var(--muted);
  margin: 12px 0 0;
}

.footer-links {
  margin-bottom: 10px;
}

.legal-page,
.error-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 32px 0;
}

.legal-card,
.error-card {
  width: min(920px, calc(100% - 32px));
  padding: 32px;
}

.legal-card h2 {
  margin-top: 28px;
}

.legal-card ol,
.legal-card ul {
  color: var(--muted);
}

.inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.error-card {
  text-align: center;
}

.error-code {
  display: inline-block;
  margin-bottom: 12px;
  padding: 8px 16px;
  border-radius: 999px;
  color: var(--accent);
  background: rgba(255, 157, 16, 0.12);
  font-weight: 700;
}

.muted {
  color: var(--muted);
}

@media (max-width: 960px) {
  .hero-grid,
  .content-wrap,
  .card-grid {
    grid-template-columns: 1fr;
  }

  .nav {
    align-items: flex-start;
    padding: 14px 0;
  }

  .nav,
  .brand {
    flex-direction: column;
  }

  .nav-links {
    justify-content: flex-start;
  }

  .hero {
    padding-top: 46px;
  }

  .sidebar {
    order: -1;
  }
}

@media (max-width: 640px) {
  .container,
  .legal-card,
  .error-card {
    width: min(calc(100% - 24px), var(--max-width));
  }

  .hero-copy h1 {
    font-size: 30px;
    line-height: 1.15;
  }

  .hero-copy p,
  .article p,
  .section-card p,
  .faq-item p,
  .mini-card ul,
  .legal-card p,
  .legal-card li,
  .error-card p {
    font-size: 15px;
    line-height: 1.8;
  }

  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    backdrop-filter: blur(14px);
    background: rgba(15, 17, 21, 0.98);
  }

  .nav {
    gap: 12px;
    min-height: auto;
    padding: 12px 0;
    align-items: center;
    flex-direction: row;
    justify-content: space-between;
  }

  .brand {
    width: auto;
    flex-direction: row;
    align-items: center;
    gap: 12px;
    flex: 0 1 auto;
  }

  .brand img {
    width: 44px;
    height: 44px;
    border-radius: 12px;
  }

  .brand small {
    display: none;
  }

  .brand-title-desktop {
    font-size: 24px;
    line-height: 1;
    text-transform: none;
  }

  .mobile-menu {
    position: relative;
    display: block;
    margin-left: auto;
    align-self: center;
    flex: 0 0 auto;
  }

  .mobile-menu summary {
    list-style: none;
  }

  .mobile-menu summary::-webkit-details-marker {
    display: none;
  }

  .menu-toggle {
    display: inline-flex;
    width: 46px;
    height: 46px;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 5px;
    margin: 0;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    cursor: pointer;
  }

  .menu-toggle span {
    width: 18px;
    height: 2px;
    border-radius: 999px;
    background: var(--text);
  }

  .mobile-nav-links {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    z-index: 30;
    width: min(260px, calc(100vw - 24px));
    padding: 12px;
    display: none;
    flex-direction: column;
    gap: 8px;
    border-radius: 16px;
    background: rgba(20, 23, 30, 0.98);
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: var(--shadow);
  }

  .mobile-menu[open] .mobile-nav-links {
    display: flex;
  }

  .nav-links {
    display: none;
  }

  .mobile-nav-links a {
    flex: 0 0 auto;
    padding: 10px 14px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.06);
    white-space: nowrap;
    border-radius: 12px;
    color: var(--text);
  }

  .hero {
    padding: 96px 0 18px;
  }

  main section {
    padding: 20px 0;
  }

  .hero-grid,
  .content-wrap,
  .card-grid,
  .faq-list {
    gap: 14px;
  }

  .badge-row,
  .tag-list,
  .footer-links,
  .inline-links {
    gap: 10px;
  }

  .badge-row {
    display: grid;
    grid-template-columns: 1fr;
  }

  .badge {
    width: 100%;
    justify-content: center;
    text-align: center;
    padding: 10px 12px;
    font-size: 13px;
  }

  .cta-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    margin-top: 22px;
  }

  .button {
    width: 100%;
    min-height: 46px;
  }

  .hero-card img {
    max-width: 180px;
    margin: 0 auto 16px;
  }

  .section-head {
    margin-bottom: 16px;
  }

  .section-head h2,
  .article h2,
  .legal-card h1,
  .error-card h1 {
    font-size: 26px;
    line-height: 1.2;
  }

  .article h3,
  .section-card h3,
  .faq-item h3,
  .mini-card h3 {
    font-size: 20px;
    line-height: 1.3;
  }

  .article h3 {
    margin-top: 22px;
  }

  .tag-list span {
    font-size: 13px;
    padding: 7px 10px;
  }

  .footer-links {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-links a,
  .inline-links a {
    text-align: center;
  }

  .site-footer {
    padding: 28px 0 38px;
  }

  .legal-page,
  .error-page {
    padding: 18px 0;
  }

  .section-card,
  .article,
  .mini-card,
  .legal-card,
  .error-card {
    padding: 20px;
  }
}