:root {
  --bg: #0b0b0e;
  --bg-elevated: #141418;
  --bg-card: #1a1a20;
  --bg-soft: #22222a;
  --line: rgba(255, 255, 255, 0.08);
  --text: #f3f3f5;
  --text-muted: #a8a8b3;
  --brand: #ff4d6d;
  --brand-2: #ff8a3d;
  --brand-3: #c84bff;
  --ok: #3dd68c;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
  --max: 1180px;
  --font: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --display: "Trebuchet MS", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(255, 77, 109, 0.18), transparent 55%),
    radial-gradient(900px 500px at 90% 0%, rgba(200, 75, 255, 0.14), transparent 50%),
    radial-gradient(800px 400px at 50% 100%, rgba(255, 138, 61, 0.1), transparent 45%),
    var(--bg);
  line-height: 1.75;
  min-height: 100vh;
}

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

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

a:hover {
  color: #ff7a90;
}

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

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--brand);
  color: #fff;
  padding: 0.6rem 1rem;
  z-index: 1000;
}

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  background: rgba(11, 11, 14, 0.82);
  border-bottom: 1px solid var(--line);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text);
  font-family: var(--display);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  object-fit: cover;
  box-shadow: 0 0 0 2px rgba(255, 77, 109, 0.35);
}

.brand span {
  font-size: 1.15rem;
}

.brand em {
  font-style: normal;
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

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

.nav a {
  color: var(--text-muted);
  padding: 0.45rem 0.75rem;
  border-radius: 999px;
  font-size: 0.95rem;
}

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

.nav-toggle {
  display: none;
  width: 28px;
  height: 28px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  padding: 0;
  align-items: center;
  justify-content: center;
}

.nav-toggle svg {
  width: 20px;
  height: 20px;
  display: block;
}

.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.06);
}

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

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

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  background: rgba(255, 77, 109, 0.12);
  color: #ffb3c1;
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

.hero h1 {
  margin: 0 0 1rem;
  font-family: var(--display);
  font-size: clamp(1.9rem, 4vw, 3rem);
  line-height: 1.25;
  letter-spacing: 0.01em;
}

.hero h1 .accent {
  background: linear-gradient(90deg, #fff, #ffb3c1 45%, var(--brand-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lead {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 38rem;
  margin: 0 0 1.5rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.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;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

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

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--brand), #ff2d55 45%, var(--brand-2));
  box-shadow: 0 10px 28px rgba(255, 77, 109, 0.35);
}

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

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

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

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.hero-meta strong {
  color: var(--text);
  font-weight: 700;
}

.hero-visual {
  position: relative;
}

.hero-visual img {
  width: 100%;
  border-radius: calc(var(--radius) + 4px);
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
  aspect-ratio: 9 / 16;
  object-fit: cover;
  object-position: top center;
  max-height: 620px;
}

.hero-float {
  position: absolute;
  left: -0.8rem;
  bottom: 1.2rem;
  width: min(48%, 220px);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  overflow: hidden;
  animation: floaty 5s ease-in-out infinite;
}

.hero-float img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  object-position: top;
  max-height: none;
  border: 0;
  border-radius: 0;
}

@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

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

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

.section-head h2 {
  margin: 0 0 0.6rem;
  font-family: var(--display);
  font-size: clamp(1.45rem, 2.6vw, 2rem);
}

.section-head p {
  margin: 0;
  color: var(--text-muted);
  max-width: 46rem;
}

.section-muted {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent);
  border-block: 1px solid var(--line);
}

/* Cards / grids */
.feature-grid,
.channel-grid,
.shot-grid,
.guide-grid,
.faq-grid,
.related-grid {
  display: grid;
  gap: 1rem;
}

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

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

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

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

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

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

.card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.card-body {
  padding: 1.1rem 1.15rem 1.25rem;
}

.card h3 {
  margin: 0 0 0.55rem;
  font-size: 1.08rem;
}

.card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.feature-card {
  padding: 1.25rem;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.feature-card:hover {
  border-color: rgba(255, 77, 109, 0.35);
  transform: translateY(-2px);
}

.feature-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  margin-bottom: 0.9rem;
  background: linear-gradient(135deg, rgba(255, 77, 109, 0.2), rgba(255, 138, 61, 0.15));
  color: #ffb3c1;
  font-weight: 700;
}

.channel-card img,
.shot-card img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  object-position: top center;
  background: var(--bg-soft);
}

.channel-card .card-body,
.shot-card .card-body {
  padding: 0.9rem 1rem 1.05rem;
}

.tag {
  display: inline-block;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  background: rgba(255, 77, 109, 0.14);
  color: #ffb3c1;
  font-size: 0.78rem;
  margin-bottom: 0.45rem;
}

/* Prose content */
.prose {
  max-width: 820px;
}

.prose h2,
.prose h3 {
  font-family: var(--display);
  line-height: 1.35;
  margin: 2rem 0 0.8rem;
}

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

.prose h3 {
  font-size: 1.2rem;
}

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

.prose p {
  margin: 0 0 1rem;
}

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

.prose li {
  margin-bottom: 0.45rem;
}

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

.content-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 1.5rem;
  align-items: start;
}

.toc {
  position: sticky;
  top: 88px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
}

.toc h2 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
}

.toc ol {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--text-muted);
  font-size: 0.92rem;
}

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

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

.article-hero {
  padding: 2.5rem 0 1rem;
}

.article-hero h1 {
  margin: 0 0 0.75rem;
  font-family: var(--display);
  font-size: clamp(1.7rem, 3vw, 2.4rem);
}

.article-hero p {
  margin: 0;
  color: var(--text-muted);
  max-width: 46rem;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-bottom: 1rem;
}

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

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

.inline-shots {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.8rem;
  margin: 1.2rem 0 1.5rem;
}

.inline-shots figure {
  margin: 0;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.inline-shots img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  object-position: top;
}

.inline-shots figcaption {
  padding: 0.55rem 0.7rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.callout {
  background: linear-gradient(135deg, rgba(255, 77, 109, 0.12), rgba(200, 75, 255, 0.08));
  border: 1px solid rgba(255, 77, 109, 0.25);
  border-radius: var(--radius);
  padding: 1.1rem 1.2rem;
  margin: 1.4rem 0;
}

.callout p {
  margin: 0;
  color: var(--text);
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.8rem;
  margin: 1.5rem 0;
}

.stat {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 1rem;
  text-align: center;
}

.stat strong {
  display: block;
  font-size: 1.35rem;
  margin-bottom: 0.2rem;
  background: linear-gradient(90deg, #fff, #ffb3c1);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.stat span {
  color: var(--text-muted);
  font-size: 0.88rem;
}

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

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

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

.faq details[open] summary {
  margin-bottom: 0.55rem;
  color: #ffb3c1;
}

.faq details p {
  margin: 0;
  color: var(--text-muted);
}

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

.error-page h1 {
  font-size: clamp(3rem, 10vw, 5.5rem);
  margin: 0 0 0.5rem;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.error-page p {
  color: var(--text-muted);
  margin: 0 0 1.5rem;
}

/* Footer */
.site-footer {
  margin-top: 2rem;
  border-top: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.35);
  padding: 2.5rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.8rem;
}

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

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

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

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

.site-footer a:hover {
  color: var(--brand);
}

.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.6rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Mobile */
@media (max-width: 980px) {
  .hero-grid,
  .content-layout,
  .feature-grid,
  .channel-grid,
  .shot-grid,
  .guide-grid,
  .related-grid,
  .footer-grid,
  .stat-row,
  .inline-shots {
    grid-template-columns: 1fr 1fr;
  }

  .content-layout {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
  }

  .hero-visual img {
    max-height: 520px;
  }
}

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

  .nav {
    display: none;
    position: absolute;
    left: 1rem;
    right: 1rem;
    top: 68px;
    flex-direction: column;
    align-items: stretch;
    background: var(--bg-elevated);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 0.6rem;
    box-shadow: var(--shadow);
  }

  .nav.open {
    display: flex;
  }

  .nav a {
    padding: 0.75rem 0.9rem;
  }

  .hero {
    padding-top: 2rem;
  }

  .hero-grid,
  .feature-grid,
  .channel-grid,
  .shot-grid,
  .guide-grid,
  .related-grid,
  .footer-grid,
  .stat-row,
  .inline-shots {
    grid-template-columns: 1fr;
  }

  .channel-grid,
  .shot-grid,
  .inline-shots {
    grid-template-columns: 1fr 1fr;
  }

  .hero-float {
    display: none;
  }

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

  .btn {
    width: 100%;
  }
}