:root {
  --bg: #f7f4f1;
  --bg-soft: #efe8e2;
  --surface: #ffffff;
  --ink: #1a1512;
  --muted: #5c534c;
  --line: #e4d9d0;
  --accent: #c45c4a;
  --accent-deep: #9e3f30;
  --accent-soft: #f3ddd7;
  --nav: #221c18;
  --shadow: 0 12px 40px rgba(34, 28, 24, 0.08);
  --radius: 14px;
  --max: 1120px;
  --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;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 0%, #f8e9e4 0%, transparent 42%),
    radial-gradient(circle at 88% 8%, #efe6dc 0%, transparent 38%),
    linear-gradient(180deg, #faf7f4 0%, var(--bg) 48%, #f3eee9 100%);
  line-height: 1.75;
  min-height: 100vh;
}

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

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

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: 0.02em;
}

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

.brand-text {
  font-family: var(--font-display);
  font-size: 1.25rem;
}

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

.nav-toggle-icon {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: background 0.2s ease;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform 0.2s ease, top 0.2s ease;
}

.nav-toggle-icon::before {
  top: -6px;
}

.nav-toggle-icon::after {
  top: 6px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  top: 0;
  transform: rotate(-45deg);
}

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

.site-nav a {
  color: var(--muted);
  font-size: 0.95rem;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

.hero {
  padding: 3.2rem 0 2rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2rem;
  align-items: center;
}

.eyebrow {
  display: inline-block;
  color: var(--accent-deep);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  margin-bottom: 0.8rem;
}

.hero h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.1rem);
  line-height: 1.25;
  font-weight: 400;
}

.hero-lead {
  margin: 0 0 1.5rem;
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 34em;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.25rem;
  border-radius: 999px;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: 0.2s ease;
}

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

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

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

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

.hero-visual {
  position: relative;
}

.hero-visual img {
  width: 100%;
  border-radius: 18px;
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
}

.section {
  padding: 2.8rem 0;
}

.section-head {
  margin-bottom: 1.5rem;
}

.section-head h2 {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 2.6vw, 2.1rem);
  font-weight: 400;
}

.section-head p {
  margin: 0;
  color: var(--muted);
  max-width: 48em;
}

.feature-grid,
.channel-grid,
.vlog-grid,
.extra-grid {
  display: grid;
  gap: 1.1rem;
}

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

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

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

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

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 6px 24px rgba(34, 28, 24, 0.04);
}

.card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background: var(--bg-soft);
}

.card-body {
  padding: 1rem 1.05rem 1.15rem;
}

.card-body h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}

.card-body p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.prose {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.6rem 1.5rem;
}

.prose h2,
.prose h3 {
  font-family: var(--font-display);
  font-weight: 400;
  margin-top: 1.6rem;
}

.prose h2:first-child,
.prose h3:first-child {
  margin-top: 0;
}

.prose p,
.prose li {
  color: var(--muted);
}

.prose ul {
  padding-left: 1.2rem;
}

.prose a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.toc {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  margin: 1.5rem 0 2rem;
}

.toc a {
  display: block;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.9rem 1rem;
  color: var(--ink);
  font-size: 0.92rem;
}

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

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  align-items: stretch;
}

.split img {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  object-fit: cover;
  min-height: 240px;
}

.note {
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  padding: 1rem 1.1rem;
  border-radius: 0 12px 12px 0;
  color: var(--ink);
  margin: 1.2rem 0;
}

.page-hero {
  padding: 2.4rem 0 1rem;
}

.page-hero h1 {
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.4vw, 2.5rem);
  font-weight: 400;
}

.page-hero p {
  margin: 0;
  color: var(--muted);
  max-width: 42em;
}

.site-footer {
  margin-top: 3rem;
  background: var(--nav);
  color: rgba(255, 255, 255, 0.78);
  padding: 2.4rem 0 1.6rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.6rem;
}

.site-footer h3 {
  margin: 0 0 0.8rem;
  color: #fff;
  font-size: 1rem;
}

.site-footer a {
  color: rgba(255, 255, 255, 0.72);
  display: inline-block;
  margin: 0.25rem 0;
}

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

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 0.8rem;
}

.footer-brand img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.footer-brand span {
  color: #fff;
  font-family: var(--font-display);
  font-size: 1.15rem;
}

.copyright {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 1rem;
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.55);
}

.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(2.4rem, 6vw, 4rem);
  margin: 0 0 0.6rem;
  font-weight: 400;
}

.error-page p {
  color: var(--muted);
  margin: 0 0 1.4rem;
}

.breadcrumb {
  font-size: 0.88rem;
  color: var(--muted);
  margin-bottom: 1rem;
}

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

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

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

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

@media (max-width: 960px) {
  .hero-grid,
  .split,
  .footer-grid,
  .feature-grid,
  .channel-grid,
  .vlog-grid,
  .extra-grid,
  .toc {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 760px) {
  .nav-toggle {
    display: inline-flex;
    z-index: 110;
  }

  .site-nav {
    display: none;
  }

  .site-nav.open {
    display: flex;
    position: absolute;
    top: calc(100% + 1px);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.55rem 0.85rem 0.85rem;
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid var(--line);
    border-radius: 0 0 14px 14px;
    box-shadow: var(--shadow);
    z-index: 105;
  }

  .site-nav.open a {
    padding: 0.7rem 0.35rem;
    border-bottom: 1px solid var(--line);
  }

  .site-nav.open a:last-child {
    border-bottom: none;
  }

  .header-inner {
    min-height: 60px;
  }

  .hero {
    padding-top: 1.8rem;
  }

  .hero-grid,
  .split,
  .footer-grid,
  .feature-grid,
  .channel-grid,
  .vlog-grid,
  .extra-grid,
  .toc {
    grid-template-columns: 1fr;
  }

  .card img,
  .split img {
    aspect-ratio: 16 / 11;
    min-height: auto;
  }

  .prose {
    padding: 1.2rem 1rem;
  }
}