:root {
  --bg: #0a0a0a;
  --bg-soft: #121212;
  --bg-card: #1a1a1a;
  --line: #2a2a2a;
  --text: #f2f2f2;
  --muted: #a8a8a8;
  --pink: #ff3b8e;
  --coral: #ff5e3a;
  --grad: linear-gradient(135deg, #ff3b8e 0%, #ff5e3a 100%);
  --max: 1120px;
  --radius: 12px;
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", 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(--pink);
  text-decoration: none;
}

a:hover {
  color: #ff6aa8;
}

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

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

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 700;
  font-size: 1.05rem;
}

.brand img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

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

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

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

.hero {
  position: relative;
  padding: 72px 0 56px;
  overflow: hidden;
  background:
    radial-gradient(ellipse 80% 60% at 70% 20%, rgba(255, 59, 142, 0.18), transparent 60%),
    radial-gradient(ellipse 50% 40% at 20% 80%, rgba(255, 94, 58, 0.12), transparent 55%),
    var(--bg);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
}

.hero-badge {
  display: inline-block;
  padding: 4px 12px;
  border: 1px solid rgba(255, 59, 142, 0.45);
  border-radius: 999px;
  color: var(--pink);
  font-size: 0.85rem;
  margin-bottom: 16px;
}

.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.25;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lead {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0 0 28px;
  max-width: 36em;
}

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

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

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

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

.btn-primary:hover {
  color: #fff;
  opacity: 0.92;
}

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

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

.hero-visual {
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: 0 20px 50px rgba(255, 59, 142, 0.12);
}

.hero-visual img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}

.section {
  padding: 56px 0;
}

.section-alt {
  background: var(--bg-soft);
}

.section-head {
  margin-bottom: 28px;
}

.section-head h2 {
  margin: 0 0 10px;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
}

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

.prose {
  color: #d6d6d6;
}

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

.prose h3 {
  margin: 1.6em 0 0.7em;
  font-size: 1.25rem;
  color: var(--text);
}

.prose h4 {
  margin: 1.3em 0 0.55em;
  font-size: 1.08rem;
}

.prose ul,
.prose ol {
  padding-left: 1.25em;
  margin: 0 0 1em;
  color: #d0d0d0;
}

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

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

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

.feature-card img {
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
}

.feature-card .body {
  padding: 16px 18px 20px;
}

.feature-card h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

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

.media-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: center;
  margin: 36px 0;
}

.media-block.reverse .media-text {
  order: 2;
}

.media-block.reverse .media-img {
  order: 1;
}

.media-img {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
}

.media-img img {
  width: 100%;
  aspect-ratio: 16/11;
  object-fit: cover;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.gallery a,
.gallery figure {
  margin: 0;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--bg-card);
}

.gallery img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  transition: transform 0.35s ease;
}

.gallery a:hover img {
  transform: scale(1.04);
}

.gallery figcaption {
  padding: 10px 12px;
  font-size: 0.88rem;
  color: var(--muted);
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  counter-reset: step;
}

.step {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}

.step::before {
  counter-increment: step;
  content: "0" counter(step);
  display: block;
  font-weight: 700;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 8px;
  font-size: 1.2rem;
}

.step h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

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

.faq details {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 18px;
  margin-bottom: 10px;
}

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

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

.faq details[open] summary {
  color: var(--pink);
  margin-bottom: 8px;
}

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

.toc {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 22px;
  margin: 0 0 28px;
}

.toc h2 {
  margin: 0 0 10px;
  font-size: 1.1rem;
}

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

.toc a {
  color: #d8d8d8;
}

.page-hero {
  padding: 48px 0 24px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(ellipse 60% 80% at 10% 0%, rgba(255, 59, 142, 0.12), transparent 50%),
    var(--bg);
}

.page-hero h1 {
  margin: 0 0 10px;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}

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

.breadcrumb {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 12px;
}

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

.content-wrap {
  padding: 40px 0 64px;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #080808;
  padding: 40px 0 28px;
}

.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: 12px;
}

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

.footer-col h3 {
  margin: 0 0 12px;
  font-size: 1rem;
}

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

.footer-col li {
  margin-bottom: 8px;
}

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

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

.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: 18px;
  color: #777;
  font-size: 0.88rem;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  justify-content: space-between;
}

.error-page {
  min-height: 70vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 48px 16px;
}

.error-page .code {
  font-size: clamp(4rem, 12vw, 7rem);
  font-weight: 800;
  line-height: 1;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin: 0 0 12px;
}

.error-page h1 {
  margin: 0 0 12px;
}

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

.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.related-links a {
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.9rem;
}

.related-links a:hover {
  border-color: var(--pink);
  color: var(--pink);
}

.keyword-box {
  margin-top: 28px;
  padding: 16px 18px;
  border-left: 3px solid var(--pink);
  background: var(--bg-card);
  color: var(--muted);
  font-size: 0.92rem;
}

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

  .media-block.reverse .media-text,
  .media-block.reverse .media-img {
    order: initial;
  }

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

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

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

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

  .nav-links {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 64px;
    flex-direction: column;
    align-items: stretch;
    background: #141414;
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 8px;
  }

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

  .hero {
    padding: 40px 0 36px;
  }

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

  .section {
    padding: 40px 0;
  }

  .footer-bottom {
    flex-direction: column;
  }
}