:root {
  --bg-primary: #0d0d12;
  --bg-secondary: #16161f;
  --bg-card: #1e1e2a;
  --accent: #ff3366;
  --accent-hover: #ff5580;
  --accent-soft: rgba(255, 51, 102, 0.12);
  --text-primary: #f0f0f5;
  --text-secondary: #a0a0b8;
  --text-muted: #6b6b80;
  --border: rgba(255, 255, 255, 0.08);
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --max-width: 1200px;
  --header-height: 72px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.75;
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

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

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

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 13, 18, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: var(--header-height);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-link img {
  height: 44px;
  width: auto;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.logo-text span {
  color: var(--accent);
}

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

.nav-main a {
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.95rem;
  transition: background 0.2s, color 0.2s;
}

.nav-main a:hover,
.nav-main a.active {
  color: var(--text-primary);
  background: var(--accent-soft);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
}

/* Hero */
.hero {
  padding: 80px 0 60px;
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-soft) 0%, transparent 70%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-content h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  line-height: 1.3;
  margin-bottom: 20px;
  font-weight: 800;
}

.hero-content h1 em {
  font-style: normal;
  color: var(--accent);
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #cc2255);
  color: #fff;
  box-shadow: 0 4px 20px rgba(255, 51, 102, 0.35);
}

.btn-primary:hover {
  color: #fff;
  box-shadow: 0 6px 28px rgba(255, 51, 102, 0.5);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  color: var(--text-primary);
  border-color: var(--accent);
  background: var(--accent-soft);
}

.hero-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

/* Stats */
.stats-bar {
  padding: 40px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item strong {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 4px;
}

.stat-item span {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Sections */
.section {
  padding: 72px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: 12px;
}

.section-header p {
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
}

/* Feature cards */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  transition: border-color 0.2s, transform 0.2s;
}

.feature-card:hover {
  border-color: rgba(255, 51, 102, 0.3);
  transform: translateY(-4px);
}

.feature-icon {
  width: 52px;
  height: 52px;
  background: var(--accent-soft);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
}

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

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Gallery */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.gallery-item {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 16/10;
  border: 1px solid var(--border);
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s;
}

.gallery-item:hover img {
  transform: scale(1.05);
}

.gallery-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 16px;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.85));
  font-size: 0.9rem;
}

/* Image showcase blocks */
.showcase-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 64px;
}

.showcase-row:last-child {
  margin-bottom: 0;
}

.showcase-row.reverse .showcase-media {
  order: 2;
}

.showcase-row.reverse .showcase-body {
  order: 1;
}

.showcase-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

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

.showcase-body h3 {
  font-size: 1.35rem;
  margin-bottom: 14px;
  color: var(--text-primary);
}

.showcase-body p {
  color: var(--text-secondary);
  margin-bottom: 14px;
  font-size: 0.98rem;
}

.showcase-body ul {
  margin: 0 0 16px 20px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.showcase-body li {
  margin-bottom: 6px;
}

.showcase-tag {
  display: inline-block;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 12px;
}

/* Image cards with SEO body */
.image-card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

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

.image-card:hover {
  border-color: rgba(255, 51, 102, 0.35);
  transform: translateY(-3px);
}

.image-card-thumb {
  aspect-ratio: 16/10;
  overflow: hidden;
}

.image-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s;
}

.image-card:hover .image-card-thumb img {
  transform: scale(1.04);
}

.image-card-body {
  padding: 22px 24px 26px;
}

.image-card-body h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.image-card-body p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-bottom: 12px;
  line-height: 1.7;
}

.image-card-link {
  font-size: 0.88rem;
  font-weight: 600;
}

/* App feature strip */
.app-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.app-strip-item {
  text-align: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.app-strip-item img {
  width: 100%;
  aspect-ratio: 9/16;
  max-height: 320px;
  object-fit: cover;
  object-position: top;
}

.app-strip-item h3 {
  font-size: 1rem;
  padding: 16px 16px 8px;
}

.app-strip-item p {
  color: var(--text-secondary);
  font-size: 0.88rem;
  padding: 0 16px 20px;
  line-height: 1.65;
}

/* Full-width image banner */
.img-banner {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: 40px 0;
  border: 1px solid var(--border);
}

.img-banner img {
  width: 100%;
  aspect-ratio: 21/9;
  object-fit: cover;
}

.img-banner-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(13, 13, 18, 0.92) 0%, rgba(13, 13, 18, 0.4) 60%, transparent 100%);
  display: flex;
  align-items: center;
  padding: 40px 48px;
}

.img-banner-overlay h3 {
  font-size: 1.5rem;
  margin-bottom: 10px;
}

.img-banner-overlay p {
  color: var(--text-secondary);
  max-width: 480px;
  font-size: 0.95rem;
}

/* Content article */
.content-article {
  max-width: 860px;
  margin: 0 auto;
}

.content-article h2 {
  font-size: 1.5rem;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent-soft);
}

.content-article h3 {
  font-size: 1.2rem;
  margin: 28px 0 12px;
  color: var(--text-primary);
}

.content-article p {
  margin-bottom: 16px;
  color: var(--text-secondary);
}

.content-article ul,
.content-article ol {
  margin: 0 0 16px 24px;
  color: var(--text-secondary);
}

.content-article li {
  margin-bottom: 8px;
}

.content-article a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.toc {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  margin-bottom: 40px;
}

.toc h2 {
  font-size: 1.1rem;
  margin-bottom: 12px;
  border: none;
  padding: 0;
}

.toc ol {
  margin: 0;
  padding-left: 20px;
}

.toc li {
  margin-bottom: 6px;
}

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

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

/* FAQ */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
  padding: 20px 24px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-answer {
  padding: 0 24px 20px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* CTA */
.cta-section {
  padding: 60px 0;
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-card));
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  text-align: center;
}

.cta-section h2 {
  font-size: 1.75rem;
  margin-bottom: 12px;
}

.cta-section p {
  color: var(--text-secondary);
  margin-bottom: 28px;
}

/* Page hero (subpages) */
.page-hero {
  padding: 48px 0 32px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.page-hero h1 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  margin-bottom: 8px;
}

.page-hero .breadcrumb {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.page-hero .breadcrumb a {
  color: var(--text-secondary);
}

/* Error pages */
.error-page {
  min-height: calc(100vh - var(--header-height) - 200px);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px 24px;
}

.error-code {
  font-size: 6rem;
  font-weight: 900;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 16px;
}

.error-page h1 {
  font-size: 1.75rem;
  margin-bottom: 12px;
}

.error-page p {
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

/* Footer */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 48px 0 24px;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 12px;
  max-width: 320px;
}

.footer-col h4 {
  font-size: 0.95rem;
  margin-bottom: 16px;
  color: var(--text-primary);
}

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

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

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

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Internal links block */
.internal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 32px 0;
}

.internal-links a {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.internal-links a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* APP ads bar */
.ads-bar {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 14px 0 16px;
}

.ads-bar .applist-title {
  text-align: center;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.06em;
  margin-bottom: 12px;
}

#ads {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 8px 4px;
  background: transparent;
}

#ads > div {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 78px;
  box-sizing: border-box;
}

#ads img {
  width: 72px;
  height: 72px;
  object-fit: cover;
  border-radius: 18px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
  transition: transform 180ms ease, box-shadow 180ms ease;
  display: block;
  border: 2px solid rgba(255, 51, 102, 0.25);
  background: var(--bg-card);
}

#ads a {
  display: inline-block;
  text-decoration: none;
  border-radius: 18px;
  padding: 2px;
}

#ads a:hover img,
#ads a:focus img {
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 8px 24px rgba(255, 51, 102, 0.35);
  border-color: var(--accent);
}

#ads figcaption,
#ads .caption {
  height: 16px;
  line-height: 16px;
  font-size: 11px;
  color: var(--text-secondary);
  text-align: center;
  max-width: 76px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-top: 6px;
}

/* Responsive */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-actions {
    justify-content: center;
  }

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

  .showcase-row {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .showcase-row.reverse .showcase-media,
  .showcase-row.reverse .showcase-body {
    order: unset;
  }

  .app-strip {
    grid-template-columns: 1fr;
  }

  .app-strip-item img {
    max-height: 280px;
    aspect-ratio: 16/10;
  }

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

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

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .nav-main {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid var(--border);
  }

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

  .features-grid,
  .gallery-grid,
  .image-card-grid {
    grid-template-columns: 1fr;
  }

  .img-banner-overlay {
    padding: 24px;
  }

  .img-banner img {
    aspect-ratio: 16/10;
  }

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

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}