:root {
  --bg: #0b0b0d;
  --bg-elevated: #141418;
  --bg-card: #1a1a20;
  --text: #f2f2f4;
  --text-muted: #a0a0ab;
  --accent: #e11d48;
  --accent-soft: rgba(225, 29, 72, 0.15);
  --border: #2a2a32;
  --max: 1180px;
  --radius: 10px;
  --font-display: "ZCOOL XiaoWei", "Noto Serif SC", serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  min-height: 100vh;
  background-image:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(225, 29, 72, 0.18), transparent),
    radial-gradient(ellipse 60% 40% at 90% 10%, rgba(80, 80, 120, 0.12), transparent);
}

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

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

a:hover {
  color: #fb7185;
}

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 11, 13, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--text);
  font-family: var(--font-display);
  font-size: 1.45rem;
  letter-spacing: 0.04em;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.brand span {
  background: linear-gradient(135deg, #fff 30%, #fda4af);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
  align-items: center;
}

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

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

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  padding: 0;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  cursor: pointer;
}

.nav-toggle-icon {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  position: relative;
  box-shadow: 0 -6px 0 currentColor, 0 6px 0 currentColor;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon {
  background: transparent;
  box-shadow: none;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before,
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  transform: rotate(-45deg);
}

/* Hero */
.hero {
  position: relative;
  padding: 3.5rem 0 2.5rem;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 2.5rem;
  align-items: center;
}

.hero-tag {
  display: inline-block;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 0.85rem;
  text-transform: uppercase;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.5vw, 3.1rem);
  line-height: 1.25;
  margin-bottom: 1rem;
  font-weight: 400;
}

.hero-lead {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 1.6rem;
  max-width: 36em;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.75rem 1.35rem;
  border-radius: 999px;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

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

.btn-primary:hover {
  background: #be123c;
  color: #fff;
}

.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}

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

.hero-visual {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  border: 1px solid var(--border);
}

.hero-visual img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  animation: fadeRise 1s ease both;
}

.hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 45%, rgba(11, 11, 13, 0.75));
  pointer-events: none;
}

@keyframes fadeRise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Sections */
.section {
  padding: 3rem 0;
}

.section-alt {
  background: linear-gradient(180deg, rgba(20, 20, 24, 0.6), transparent);
  border-block: 1px solid var(--border);
}

.section-head {
  margin-bottom: 1.75rem;
  max-width: 46rem;
}

.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3vw, 2.1rem);
  margin-bottom: 0.55rem;
  font-weight: 400;
}

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

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

.prose p {
  margin-bottom: 1.1rem;
}

.prose h2,
.prose h3 {
  color: var(--text);
  font-family: var(--font-display);
  font-weight: 400;
  margin: 1.8rem 0 0.75rem;
}

.prose h2 {
  font-size: 1.55rem;
}

.prose h3 {
  font-size: 1.25rem;
}

.prose ul,
.prose ol {
  margin: 0 0 1.1rem 1.25rem;
}

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

/* Category chips */
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 1.25rem 0 1.75rem;
}

.chip {
  display: inline-block;
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.88rem;
}

.chip:hover,
.chip.active {
  color: #fff;
  border-color: var(--accent);
  background: var(--accent-soft);
}

/* Grids */
.card-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.1rem;
}

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

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

.media-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.media-card:hover {
  border-color: rgba(225, 29, 72, 0.45);
  transform: translateY(-3px);
}

.media-card .thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: #111;
}

.media-card .thumb.portrait {
  aspect-ratio: 3 / 4;
}

.media-card .thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.45s ease;
}

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

.media-card .body {
  padding: 0.85rem 0.95rem 1.05rem;
}

.media-card h3 {
  font-size: 0.98rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--text);
  line-height: 1.4;
}

.media-card p {
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.badge {
  position: absolute;
  top: 0.55rem;
  left: 0.55rem;
  background: var(--accent);
  color: #fff;
  font-size: 0.7rem;
  padding: 0.18rem 0.45rem;
  border-radius: 4px;
  font-weight: 600;
  z-index: 1;
}

/* Feature list */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.15rem;
}

.feature-item {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.feature-item img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: 0.9rem;
}

.feature-item h3 {
  font-size: 1.05rem;
  margin-bottom: 0.45rem;
}

.feature-item p {
  color: var(--text-muted);
  font-size: 0.92rem;
}

/* Split */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
}

.split img {
  border-radius: 14px;
  border: 1px solid var(--border);
  width: 100%;
}

/* TOC / internal nav */
.toc {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem;
  margin: 1.5rem 0 2rem;
}

.toc h2 {
  font-size: 1.1rem;
  margin-bottom: 0.7rem;
  font-family: var(--font-display);
  font-weight: 400;
}

.toc ol {
  margin-left: 1.2rem;
  color: var(--text-muted);
}

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

.toc a:hover {
  color: var(--accent);
}

/* FAQ */
.faq details {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.95rem 1.1rem;
  margin-bottom: 0.65rem;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}

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

.faq details[open] summary {
  color: var(--accent);
  margin-bottom: 0.55rem;
}

.faq details p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Page header for inner pages */
.page-hero {
  padding: 2.5rem 0 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}

.page-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  font-weight: 400;
  margin-bottom: 0.5rem;
}

.page-hero p {
  color: var(--text-muted);
  max-width: 40rem;
}

.breadcrumb {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.85rem;
}

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

.content-wrap {
  max-width: 820px;
  padding-bottom: 3.5rem;
}

/* Error pages */
.error-page {
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 3rem 1rem;
}

.error-page h1 {
  font-family: var(--font-display);
  font-size: clamp(3rem, 10vw, 5.5rem);
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.75rem;
}

.error-page h2 {
  font-size: 1.4rem;
  margin-bottom: 0.75rem;
  font-weight: 500;
}

.error-page p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  max-width: 28rem;
  margin-inline: auto;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  background: #08080a;
  padding: 2.5rem 0 1.5rem;
  margin-top: 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 1.75rem;
  margin-bottom: 2rem;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 1.3rem;
  margin-bottom: 0.6rem;
}

.footer-grid p,
.footer-grid li {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-grid h3 {
  font-size: 0.95rem;
  margin-bottom: 0.7rem;
  font-weight: 600;
}

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

.footer-grid li {
  margin-bottom: 0.4rem;
}

.footer-grid a {
  color: var(--text-muted);
}

.footer-grid a:hover {
  color: var(--accent);
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 1.1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 0.82rem;
}

.age-notice {
  display: inline-block;
  margin-top: 0.85rem;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Mobile bottom bar */
.mobile-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 90;
  background: rgba(12, 12, 14, 0.96);
  border-top: 1px solid var(--border);
  padding: 0.4rem 0.5rem calc(0.4rem + env(safe-area-inset-bottom));
}

.mobile-bar nav {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  text-align: center;
  gap: 0.2rem;
}

.mobile-bar a {
  color: var(--text-muted);
  font-size: 0.68rem;
  padding: 0.35rem 0.15rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
}

.mobile-bar a.active,
.mobile-bar a:hover {
  color: var(--accent);
}

.mobile-bar .ico {
  font-size: 1.05rem;
  line-height: 1;
}

/* Animations */
.reveal {
  animation: fadeRise 0.7s ease both;
}

.reveal-delay {
  animation-delay: 0.15s;
}

/* Responsive */
@media (max-width: 980px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

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

  .hero-visual {
    max-width: 420px;
    margin-inline: auto;
  }
}

@media (max-width: 720px) {
  body {
    font-size: 15px;
    padding-bottom: 4.2rem;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-toggle[aria-expanded="true"] + .nav,
  .nav.open {
    display: flex;
  }

  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: stretch;
    padding: 0.75rem 1rem 1rem;
    gap: 0.15rem;
  }

  .nav.open {
    display: flex;
  }

  .nav a {
    padding: 0.65rem 0.4rem;
    border-bottom: 1px solid var(--border);
  }

  .header-inner {
    position: relative;
  }

  .hero {
    padding: 2rem 0 1.5rem;
  }

  .card-grid,
  .card-grid-2,
  .card-grid-3,
  .feature-grid {
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
  }

  .media-card .body {
    padding: 0.65rem 0.7rem 0.8rem;
  }

  .media-card h3 {
    font-size: 0.86rem;
  }

  .media-card p {
    display: none;
  }

  .mobile-bar {
    display: block;
  }

  .section {
    padding: 2.2rem 0;
  }

  .btn {
    width: 100%;
  }

  .hero-actions {
    flex-direction: column;
  }
}

@media (max-width: 420px) {
  .card-grid,
  .feature-grid,
  .card-grid-3 {
    grid-template-columns: 1fr;
  }

  .card-grid-2 {
    grid-template-columns: 1fr 1fr;
  }
}