:root {
  --bg: #0f0a0d;
  --bg-soft: #1a1218;
  --bg-card: #22181f;
  --line: #3a2a33;
  --text: #f5eef2;
  --muted: #b9a4af;
  --accent: #e84a7f;
  --accent-2: #ff7aa8;
  --accent-dim: rgba(232, 74, 127, 0.16);
  --max: 1120px;
  --radius: 12px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --font: "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(232, 74, 127, 0.18), transparent 60%),
    radial-gradient(900px 500px at 100% 0%, rgba(255, 122, 168, 0.1), transparent 55%),
    var(--bg);
  line-height: 1.75;
  min-height: 100vh;
}

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

a {
  color: var(--accent-2);
  text-decoration: none;
}

a:hover {
  color: #fff;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 10, 13, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

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

.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(--accent-dim);
}

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--bg-soft);
  color: var(--text);
  border-radius: 8px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.hero {
  padding: 56px 0 28px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 28px;
  align-items: center;
}

.hero h1 {
  margin: 0 0 14px;
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  line-height: 1.25;
  letter-spacing: 0.01em;
}

.hero .lead {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0 0 22px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 18px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border-radius: 999px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: 0.2s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #c73468);
  color: #fff;
}

.btn-primary:hover {
  filter: brightness(1.08);
  color: #fff;
}

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

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent-2);
}

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

.hero-visual img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  max-height: 520px;
}

.section {
  padding: 42px 0;
}

.section-head {
  margin-bottom: 22px;
}

.section-head h2 {
  margin: 0 0 8px;
  font-size: clamp(1.35rem, 2.4vw, 1.8rem);
}

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

.breadcrumb {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 16px;
}

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

.breadcrumb a:hover {
  color: var(--accent-2);
}

.grid-3,
.grid-4,
.grid-2 {
  display: grid;
  gap: 16px;
}

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

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

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

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

.card:hover {
  transform: translateY(-3px);
  border-color: rgba(232, 74, 127, 0.45);
}

.card img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  background: var(--bg-soft);
}

.card-body {
  padding: 14px 14px 16px;
}

.card-body h3 {
  margin: 0 0 6px;
  font-size: 1.02rem;
}

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

.feature-list {
  display: grid;
  gap: 14px;
}

.feature-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 16px;
  align-items: start;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
}

.feature-item img {
  width: 120px;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: 8px;
}

.feature-item h3 {
  margin: 0 0 6px;
  font-size: 1.05rem;
}

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

.prose {
  background: rgba(34, 24, 31, 0.72);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}

.prose h2,
.prose h3 {
  margin-top: 1.4em;
  margin-bottom: 0.55em;
}

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

.prose p {
  margin: 0 0 1em;
  color: #e8dce2;
}

.prose ul,
.prose ol {
  margin: 0 0 1em;
  padding-left: 1.2em;
  color: #e8dce2;
}

.prose li {
  margin-bottom: 0.4em;
}

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

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

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

.cta-box {
  text-align: center;
  padding: 36px 22px;
  border-radius: var(--radius);
  border: 1px solid rgba(232, 74, 127, 0.35);
  background:
    linear-gradient(160deg, rgba(232, 74, 127, 0.18), rgba(34, 24, 31, 0.9));
}

.cta-box h2 {
  margin: 0 0 10px;
}

.cta-box p {
  margin: 0 0 18px;
  color: var(--muted);
}

.page-hero {
  padding: 36px 0 10px;
}

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

.page-hero p {
  margin: 0;
  color: var(--muted);
  max-width: 760px;
}

.error-page {
  min-height: 70vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 40px 0;
}

.error-page .code {
  font-size: clamp(3rem, 10vw, 5rem);
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 10px;
}

.site-footer {
  margin-top: 40px;
  border-top: 1px solid var(--line);
  background: #0b0709;
  padding: 34px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 24px;
  margin-bottom: 22px;
}

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

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

.site-footer a {
  display: block;
  margin-bottom: 8px;
}

.site-footer a:hover {
  color: var(--accent-2);
}

.copyright {
  border-top: 1px solid var(--line);
  padding-top: 16px;
  color: #8d7784;
  font-size: 0.85rem;
  text-align: center;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.tag {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--accent-dim);
  color: var(--accent-2);
  font-size: 0.82rem;
}

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

  .feature-item {
    grid-template-columns: 96px 1fr;
  }

  .feature-item img {
    width: 96px;
  }
}

@media (max-width: 720px) {
  .menu-toggle {
    display: inline-flex;
  }

  .nav {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 68px;
    flex-direction: column;
    align-items: stretch;
    background: var(--bg-soft);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 8px;
    box-shadow: var(--shadow);
  }

  .nav.open {
    display: flex;
  }

  .hero {
    padding-top: 28px;
  }

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

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

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

  .feature-item img {
    width: 100%;
    max-height: 280px;
  }

  .prose {
    padding: 18px;
  }
}