:root {
  --bg: #0b0b0f;
  --bg-soft: #14141c;
  --bg-card: #1a1a24;
  --text: #f2f2f5;
  --muted: #a3a3b2;
  --line: #2a2a38;
  --brand: #e11d48;
  --brand-soft: #fb7185;
  --accent: #f43f5e;
  --ok: #22c55e;
  --max: 1120px;
  --radius: 14px;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
  --font-display: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(225, 29, 72, 0.22), transparent 55%),
    radial-gradient(900px 500px at 90% 0%, rgba(244, 63, 94, 0.12), transparent 50%),
    linear-gradient(180deg, #0b0b0f 0%, #101018 40%, #0b0b0f 100%);
  line-height: 1.75;
  min-height: 100vh;
}

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

a {
  color: var(--brand-soft);
  text-decoration: none;
}

a:hover {
  color: #fff;
  text-decoration: underline;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(14px);
  background: rgba(11, 11, 15, 0.85);
  border-bottom: 1px solid var(--line);
}

.nav {
  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: #fff;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  object-fit: cover;
}

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

.brand em {
  font-style: normal;
  color: var(--brand-soft);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.95rem;
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a.active {
  color: #fff;
}

.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--line);
  color: #fff;
  border-radius: 10px;
  cursor: pointer;
}

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

.hero {
  padding: 3.2rem 0 2.2rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2rem;
  align-items: center;
}

.eyebrow {
  display: inline-block;
  color: var(--brand-soft);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.8rem;
}

.hero h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.75rem);
  line-height: 1.25;
  font-weight: 800;
}

.hero-lead {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0 0 1.5rem;
  max-width: 36rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.75rem 1.25rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  text-decoration: none;
  transition: 0.2s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--brand), #be123c);
  color: #fff;
  box-shadow: 0 8px 24px rgba(225, 29, 72, 0.35);
}

.btn-primary:hover {
  color: #fff;
  transform: translateY(-1px);
  text-decoration: none;
}

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

.btn-ghost:hover {
  border-color: var(--brand-soft);
  color: #fff;
  text-decoration: none;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.hero-meta strong {
  color: #fff;
}

.hero-visual {
  position: relative;
}

.hero-visual img {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  aspect-ratio: 9 / 16;
  object-fit: cover;
  max-height: 520px;
}

.section {
  padding: 2.5rem 0;
}

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

.section-head h2 {
  margin: 0 0 0.55rem;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  line-height: 1.3;
}

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

.prose {
  background: rgba(26, 26, 36, 0.55);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem 1.6rem;
}

.prose h2,
.prose h3 {
  scroll-margin-top: 5rem;
}

.prose h2 {
  margin-top: 2rem;
  margin-bottom: 0.8rem;
  font-size: 1.45rem;
  border-left: 3px solid var(--brand);
  padding-left: 0.75rem;
}

.prose h3 {
  margin-top: 1.5rem;
  margin-bottom: 0.6rem;
  font-size: 1.15rem;
  color: #fff;
}

.prose p {
  margin: 0 0 1rem;
  color: #d8d8e2;
}

.prose ul,
.prose ol {
  margin: 0 0 1rem;
  padding-left: 1.25rem;
  color: #d8d8e2;
}

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

.prose strong {
  color: #fff;
}

.toc {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem 1.35rem;
  margin-bottom: 1.5rem;
}

.toc h2 {
  margin: 0 0 0.8rem;
  font-size: 1.1rem;
  border: 0;
  padding: 0;
}

.toc ol {
  margin: 0;
  padding-left: 1.2rem;
  columns: 2;
  gap: 1.5rem;
}

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

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

.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: 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);
}

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

.feature-card:hover,
.shot-card:hover {
  border-color: rgba(244, 63, 94, 0.45);
  transform: translateY(-2px);
}

.feature-card img,
.shot-card img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  background: #000;
}

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

.feature-card h3,
.shot-card h3 {
  margin: 0 0 0.45rem;
  font-size: 1.05rem;
}

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

.pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

.pill-list a {
  display: inline-block;
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.88rem;
  text-decoration: none;
  background: rgba(255, 255, 255, 0.02);
}

.pill-list a:hover {
  border-color: var(--brand-soft);
  color: #fff;
}

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

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

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

.page-hero {
  padding: 2.4rem 0 1.2rem;
}

.page-hero h1 {
  margin: 0 0 0.6rem;
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
}

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

.breadcrumb {
  color: var(--muted);
  font-size: 0.88rem;
  margin-bottom: 0.8rem;
}

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

.site-footer {
  margin-top: 3rem;
  border-top: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.35);
  padding: 2.2rem 0 1.6rem;
}

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

.site-footer h3 {
  margin: 0 0 0.7rem;
  font-size: 1rem;
}

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

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

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

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

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

.copy {
  border-top: 1px solid var(--line);
  padding-top: 1rem;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
}

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

.error-page h1 {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  margin: 0 0 0.5rem;
  color: var(--brand-soft);
}

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

.related {
  margin-top: 2rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
}

.related h3 {
  margin: 0 0 0.7rem;
}

@media (max-width: 900px) {
  .hero-grid,
  .footer-grid,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr 1fr;
  }

  .toc ol {
    columns: 1;
  }

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

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(11, 11, 15, 0.98);
    border-bottom: 1px solid var(--line);
    padding: 0.8rem 1rem 1rem;
    flex-direction: column;
    gap: 0.65rem;
  }

  .nav-links.open {
    display: flex;
  }

  .nav {
    position: relative;
  }
}

@media (max-width: 640px) {
  .hero {
    padding: 2rem 0 1.4rem;
  }

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

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

  .prose {
    padding: 1.15rem 1rem;
  }

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

  .btn {
    width: 100%;
  }
}