:root {
  --bg: #0a0a0c;
  --bg-soft: #121218;
  --bg-card: #1a1a22;
  --line: #2a2a36;
  --text: #e8e8ed;
  --muted: #9a9aab;
  --accent: #3ddc84;
  --accent-dim: #2bb86a;
  --danger: #e85d5d;
  --max: 1120px;
  --radius: 12px;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.45);
  --font: "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);
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
}

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

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

a:hover {
  color: #6aefaa;
}

.container {
  width: min(100% - 32px, var(--max));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 12, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  font-weight: 700;
  font-size: 1.15rem;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 10px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav a {
  color: var(--muted);
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 0.95rem;
}

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

.nav-toggle {
  display: none;
  background: var(--bg-card);
  border: 1px solid var(--line);
  color: var(--text);
  width: 42px;
  height: 42px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1.2rem;
}

.hero {
  position: relative;
  padding: 56px 0 40px;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(61, 220, 132, 0.12), transparent 45%),
    radial-gradient(ellipse at 80% 0%, rgba(80, 80, 140, 0.18), transparent 40%),
    linear-gradient(180deg, #101018 0%, var(--bg) 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 36px;
  align-items: center;
}

.hero h1 {
  margin: 0 0 14px;
  font-size: clamp(1.8rem, 3.2vw, 2.6rem);
  line-height: 1.25;
}

.hero .lead {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0 0 24px;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 18px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 10px;
  border: 1px solid transparent;
  font-weight: 600;
  cursor: pointer;
  transition: 0.2s ease;
}

.btn-primary {
  background: var(--accent);
  color: #062214;
}

.btn-primary:hover {
  background: var(--accent-dim);
  color: #062214;
}

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

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

.hero-shot {
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  background: var(--bg-card);
}

.hero-shot img {
  width: 100%;
}

.section {
  padding: 56px 0;
}

.section-alt {
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-title {
  margin: 0 0 10px;
  font-size: clamp(1.45rem, 2.4vw, 2rem);
}

.section-desc {
  margin: 0 0 28px;
  color: var(--muted);
  max-width: 760px;
}

.feature-grid,
.shot-grid,
.card-grid {
  display: grid;
  gap: 20px;
}

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

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

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

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

.feature-card,
.content-card {
  padding: 22px;
}

.feature-card h3,
.content-card h3 {
  margin: 0 0 10px;
  font-size: 1.15rem;
}

.feature-card p,
.content-card p {
  margin: 0;
  color: var(--muted);
}

.shot-card figcaption {
  padding: 12px 14px;
  color: var(--muted);
  font-size: 0.92rem;
}

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

.prose {
  max-width: 860px;
}

.prose h2 {
  margin: 36px 0 14px;
  font-size: 1.45rem;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.prose h3 {
  margin: 28px 0 10px;
  font-size: 1.15rem;
}

.prose p {
  margin: 0 0 16px;
  color: #d2d2dc;
}

.prose ul,
.prose ol {
  margin: 0 0 18px;
  padding-left: 1.2em;
  color: #d2d2dc;
}

.prose li {
  margin-bottom: 8px;
}

.prose strong {
  color: #fff;
}

.breadcrumb {
  padding: 18px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

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

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

.page-hero {
  padding: 28px 0 10px;
}

.page-hero h1 {
  margin: 0 0 10px;
  font-size: clamp(1.6rem, 2.8vw, 2.2rem);
}

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

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

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

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

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-cloud a,
.tag {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

.tag-cloud a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.faq details {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
  margin-bottom: 12px;
}

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

.faq p {
  margin: 10px 0 0;
  color: var(--muted);
}

.site-footer {
  margin-top: 40px;
  padding: 40px 0 28px;
  background: #07070a;
  border-top: 1px solid var(--line);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 28px;
  margin-bottom: 28px;
}

.footer-brand {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.footer-brand img {
  width: 48px;
  height: 48px;
  border-radius: 10px;
}

.footer-brand p,
.footer-col p {
  color: var(--muted);
  margin: 8px 0 0;
  font-size: 0.92rem;
}

.footer-col h4 {
  margin: 0 0 12px;
}

.footer-col a {
  display: block;
  color: var(--muted);
  margin-bottom: 8px;
}

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

.copyright {
  border-top: 1px solid var(--line);
  padding-top: 18px;
  color: #777788;
  font-size: 0.88rem;
  text-align: center;
}

.error-page {
  min-height: 70vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 60px 0;
}

.error-page h1 {
  font-size: clamp(2.4rem, 6vw, 4rem);
  margin: 0 0 10px;
  color: var(--accent);
}

.error-page p {
  color: var(--muted);
  margin: 0 0 24px;
}

.toc {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin: 0 0 28px;
}

.toc h2 {
  margin: 0 0 10px;
  font-size: 1.05rem;
}

.toc ol {
  margin: 0;
  padding-left: 1.2em;
  color: var(--muted);
}

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

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

.highlight-box {
  background: linear-gradient(135deg, rgba(61, 220, 132, 0.08), rgba(61, 220, 132, 0.02));
  border: 1px solid rgba(61, 220, 132, 0.28);
  border-radius: var(--radius);
  padding: 20px;
  margin: 20px 0;
}

@media (max-width: 960px) {
  .hero-grid,
  .two-col,
  .footer-grid,
  .card-grid {
    grid-template-columns: 1fr;
  }

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

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

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

  .nav {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: #0f0f14;
    border-bottom: 1px solid var(--line);
    padding: 10px;
  }

  .nav.open {
    display: flex;
  }

  .nav a {
    padding: 12px 14px;
  }

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

  .hero {
    padding-top: 32px;
  }

  .section {
    padding: 40px 0;
  }

  .shot-card img,
  .media-block img {
    aspect-ratio: 3 / 4;
  }
}