:root {
  --bg: #120e10;
  --bg-2: #1c1518;
  --bg-3: #261c21;
  --surface: rgba(255, 248, 245, 0.04);
  --text: #f6efe9;
  --muted: #b9a8a0;
  --accent: #d45a6a;
  --accent-2: #e8b86d;
  --line: rgba(246, 239, 233, 0.12);
  --radius: 14px;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  --max: 1120px;
  --font-display: "ZCOOL XiaoWei", "Noto Serif SC", serif;
  --font-body: "Noto Sans SC", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(212, 90, 106, 0.22), transparent 60%),
    radial-gradient(900px 500px at 0% 20%, rgba(232, 184, 109, 0.12), transparent 55%),
    linear-gradient(180deg, #161013 0%, var(--bg) 40%, #0d0a0b 100%);
  min-height: 100vh;
}

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

a {
  color: var(--accent-2);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

a:hover {
  color: #ffd89a;
}

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 1000;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(14px);
  background: rgba(18, 14, 16, 0.82);
  border-bottom: 1px solid var(--line);
}

#ads-bar {
  position: fixed;
  left: 0;
  right: 0;
  z-index: 90;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--text);
}

.brand img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  object-fit: cover;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.45rem;
  letter-spacing: 0.04em;
}

.brand-tag {
  display: block;
  font-size: 0.72rem;
  color: var(--muted);
  margin-top: 0.1rem;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  align-items: center;
}

.nav a {
  color: var(--muted);
  font-size: 0.95rem;
}

.nav a:hover,
.nav a.active {
  color: var(--text);
}

.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  border-radius: 10px;
  cursor: pointer;
}

.menu-toggle svg {
  width: 22px;
  height: 22px;
  display: block;
  pointer-events: none;
}

.menu-toggle .icon-close {
  display: none;
}

.menu-toggle[aria-expanded="true"] .icon-menu {
  display: none;
}

.menu-toggle[aria-expanded="true"] .icon-close {
  display: block;
}

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.38) saturate(1.05);
  transform: scale(1.04);
  animation: slowZoom 18s ease-in-out infinite alternate;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(12, 8, 10, 0.92) 0%, rgba(12, 8, 10, 0.68) 48%, rgba(12, 8, 10, 0.4) 100%),
    linear-gradient(180deg, transparent 40%, rgba(12, 8, 10, 0.85) 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: clamp(3.5rem, 9vw, 7rem) 0 clamp(3rem, 6vw, 5rem);
  max-width: 640px;
}

.eyebrow {
  display: inline-block;
  color: var(--accent-2);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  margin-bottom: 0.8rem;
}

.hero h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  line-height: 1.25;
  font-weight: 400;
}

.hero-lead {
  margin: 0 0 1.6rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.78rem 1.25rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #a8324a);
  color: #fff;
  box-shadow: 0 10px 30px rgba(212, 90, 106, 0.35);
}

.btn-primary:hover {
  color: #fff;
  opacity: 0.92;
}

.btn-ghost {
  border-color: var(--line);
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
}

.btn-ghost:hover {
  color: var(--accent-2);
}

.age-note {
  margin-top: 1.2rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.section {
  padding: clamp(2.5rem, 5vw, 4.5rem) 0;
}

.section-head {
  margin-bottom: 1.8rem;
  max-width: 720px;
}

.section-head h2 {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 400;
}

.section-head p {
  margin: 0;
  color: var(--muted);
}

.grid {
  display: grid;
  gap: 1.1rem;
}

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

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

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

.card-media {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--bg-3);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  transition: transform 0.35s ease, border-color 0.35s ease;
}

.card-media:hover {
  transform: translateY(-4px);
  border-color: rgba(232, 184, 109, 0.35);
}

.card-media img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.card-media:hover img {
  transform: scale(1.04);
}

.card-media .cap {
  padding: 0.85rem 1rem 1rem;
}

.card-media h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
}

.card-media p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.feature {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 1.5rem;
  align-items: center;
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 4px);
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01));
  margin-bottom: 1.2rem;
}

.feature.reverse {
  grid-template-columns: 0.95fr 1.05fr;
}

.feature.reverse .feature-copy {
  order: 2;
}

.feature img {
  width: 100%;
  border-radius: var(--radius);
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.feature h3 {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 400;
}

.feature p {
  margin: 0 0 0.7rem;
  color: var(--muted);
}

.prose {
  max-width: 820px;
}

.prose h2,
.prose h3 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.35;
}

.prose h2 {
  margin: 2.2rem 0 0.8rem;
  font-size: 1.7rem;
}

.prose h3 {
  margin: 1.6rem 0 0.6rem;
  font-size: 1.25rem;
}

.prose p {
  margin: 0 0 1rem;
  color: #e7ddd6;
}

.prose ul,
.prose ol {
  margin: 0 0 1rem;
  padding-left: 1.2rem;
  color: #e7ddd6;
}

.prose li {
  margin-bottom: 0.4rem;
}

.breadcrumb {
  padding: 1rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

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

.page-hero {
  padding: 2rem 0 1rem;
}

.page-hero h1 {
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 400;
}

.page-hero p {
  margin: 0;
  color: var(--muted);
  max-width: 680px;
}

.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 1.2rem 0 0.5rem;
}

.toc a {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
  color: var(--muted);
  font-size: 0.88rem;
  background: var(--surface);
}

.faq details {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.9rem 1rem;
  background: var(--surface);
  margin-bottom: 0.7rem;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
}

.faq p {
  margin: 0.7rem 0 0;
  color: var(--muted);
}

.site-footer {
  margin-top: 2rem;
  border-top: 1px solid var(--line);
  background: #0c090a;
  padding: 2.5rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 1.5rem;
}

.footer-grid h3 {
  margin: 0 0 0.8rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 400;
}

.footer-grid p,
.footer-grid a {
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-grid ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-grid li {
  margin-bottom: 0.45rem;
}

.copyright {
  margin-top: 1.8rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
  color: #8f7f78;
  font-size: 0.85rem;
}

.error-page {
  min-height: 70vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 3rem 1rem;
}

.error-page h1 {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  margin: 0 0 0.6rem;
  font-weight: 400;
}

.error-page p {
  color: var(--muted);
  max-width: 460px;
  margin: 0 auto 1.4rem;
}

@keyframes slowZoom {
  from {
    transform: scale(1.02);
  }
  to {
    transform: scale(1.08);
  }
}

@media (max-width: 960px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .feature,
  .feature.reverse {
    grid-template-columns: 1fr;
  }

  .feature.reverse .feature-copy {
    order: 0;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 720px) {
  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    padding: 0.4rem 0 0.8rem;
  }

  .nav.open {
    display: flex;
  }

  .header-inner {
    flex-wrap: wrap;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .hero-content {
    max-width: 100%;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .cta-row {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}