/* 糖心Vlog官网 - 全局样式 */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a24;
  --text-primary: #f5f5f7;
  --text-secondary: #a0a0b0;
  --accent: #e91e63;
  --accent-light: #ff4081;
  --gradient: linear-gradient(135deg, #7b2ff7 0%, #e91e63 50%, #ff6b35 100%);
  --border: rgba(255, 255, 255, 0.08);
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --max-width: 1200px;
}

*, *::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: 1.7;
  min-height: 100vh;
}

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

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

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.15rem;
}

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

.main-nav { display: flex; gap: 6px; list-style: none; flex-wrap: wrap; }

.main-nav a {
  color: var(--text-secondary);
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 0.9rem;
  transition: all 0.2s;
}

.main-nav a:hover,
.main-nav a.active {
  color: #fff;
  background: rgba(233, 30, 99, 0.15);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px 8px;
}

/* Hero */
.hero {
  padding: 60px 0 50px;
  text-align: center;
  background: radial-gradient(ellipse at 50% 0%, rgba(123, 47, 247, 0.15) 0%, transparent 60%);
}

.hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 680px;
  margin: 0 auto 28px;
}

.hero-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

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

.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 4px 20px rgba(233, 30, 99, 0.35);
}

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

.btn-outline:hover { border-color: var(--accent); color: #fff; }

/* Stats */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding: 40px 0;
}

.stat-item {
  text-align: center;
  padding: 24px 16px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label { color: var(--text-secondary); font-size: 0.85rem; margin-top: 4px; }

/* Section */
.section { padding: 50px 0; }
.section-alt { background: var(--bg-secondary); }

.section-header { text-align: center; margin-bottom: 36px; }

.section-header h2 {
  font-size: clamp(1.3rem, 3vw, 1.8rem);
  margin-bottom: 10px;
}

.section-header p { color: var(--text-secondary); max-width: 600px; margin: 0 auto; }

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

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: border-color 0.2s, transform 0.2s;
}

.feature-card:hover { border-color: rgba(233, 30, 99, 0.3); transform: translateY(-3px); }

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 16px;
}

.feature-card h3 { font-size: 1.05rem; margin-bottom: 8px; }
.feature-card p { color: var(--text-secondary); font-size: 0.9rem; }

/* Content Showcase */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

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

.showcase-item:hover { transform: translateY(-4px); }

.showcase-item img { width: 100%; aspect-ratio: 9/16; object-fit: cover; object-position: top; max-height: 480px; }

.showcase-body { padding: 20px; }

.showcase-body h3 { font-size: 1.05rem; margin-bottom: 8px; }
.showcase-body p { color: var(--text-secondary); font-size: 0.88rem; margin-bottom: 12px; }

.tag-list { display: flex; flex-wrap: wrap; gap: 6px; }

.tag {
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 20px;
  background: rgba(233, 30, 99, 0.12);
  color: var(--accent-light);
}

/* Category tabs */
.category-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 30px;
}

.category-tabs a {
  padding: 8px 18px;
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border);
}

.category-tabs a:hover,
.category-tabs a.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* FAQ */
.faq-list { max-width: 800px; margin: 0 auto; }

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

.faq-item summary {
  padding: 18px 22px;
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item summary::after { content: "+"; font-size: 1.2rem; color: var(--accent); }
.faq-item[open] summary::after { content: "−"; }

.faq-item .faq-answer {
  padding: 0 22px 18px;
  color: var(--text-secondary);
  font-size: 0.92rem;
}

/* Breadcrumb */
.breadcrumb {
  padding: 16px 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--accent-light); }
.breadcrumb span { margin: 0 6px; }

/* Page Content */
.page-content { padding: 30px 0 60px; }
.page-content h1 { font-size: 1.8rem; margin-bottom: 20px; }
.page-content h2 { font-size: 1.3rem; margin: 28px 0 12px; color: var(--accent-light); }
.page-content h3 { font-size: 1.1rem; margin: 20px 0 8px; }
.page-content p { margin-bottom: 14px; color: var(--text-secondary); }
.page-content ul, .page-content ol { margin: 0 0 14px 24px; color: var(--text-secondary); }
.page-content li { margin-bottom: 6px; }
.page-content .updated { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 24px; }

/* Footer */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 40px 0 24px;
  margin-top: 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 30px;
  margin-bottom: 30px;
}

.footer-brand p { color: var(--text-secondary); font-size: 0.88rem; margin-top: 10px; max-width: 360px; }

.footer-col h4 { font-size: 0.95rem; margin-bottom: 14px; }

.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 8px; }
.footer-col a { color: var(--text-secondary); font-size: 0.88rem; }
.footer-col a:hover { color: var(--accent-light); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* Error Pages */
.error-page {
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 20px;
}

.error-code {
  font-size: 6rem;
  font-weight: 900;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.error-page h1 { font-size: 1.5rem; margin: 16px 0 10px; }
.error-page p { color: var(--text-secondary); margin-bottom: 24px; }

/* Internal links block */
.internal-links {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin: 30px 0;
}

.internal-links h3 { font-size: 1rem; margin-bottom: 12px; }
.internal-links ul { list-style: none; display: flex; flex-wrap: wrap; gap: 10px 20px; }
.internal-links a { font-size: 0.88rem; }

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

.ads-bar #applist {
  text-align: center;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.ads-bar .applist-title {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--accent-light);
  margin-bottom: 10px;
  letter-spacing: 0.02em;
}

.ads-bar #ads {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 6px 4px;
  background: transparent;
}

.ads-bar #ads > div {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 76px;
  box-sizing: border-box;
}

.ads-bar #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, 255, 255, 0.06);
  background: #fff;
}

.ads-bar #ads a {
  display: inline-block;
  text-decoration: none;
  border-radius: 18px;
  -webkit-tap-highlight-color: transparent;
}

.ads-bar #ads a:hover img,
.ads-bar #ads a:active img {
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 8px 24px rgba(233, 30, 99, 0.35);
  border-color: rgba(233, 30, 99, 0.4);
}

.ads-bar #ads .caption {
  height: 16px;
  line-height: 16px;
  font-size: 11px;
  color: var(--text-secondary);
  text-align: center;
  max-width: 72px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-top: 5px;
}

/* Hero with preview image */
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
  align-items: center;
  text-align: left;
}

.hero-grid .hero-desc { margin: 0 0 28px; }
.hero-grid .hero-cta { justify-content: flex-start; }

.hero-preview {
  position: relative;
}

.hero-preview img {
  border-radius: 20px;
  border: 2px solid var(--border);
  box-shadow: var(--shadow);
  max-height: 540px;
  object-fit: cover;
  object-position: top;
}

.hero-preview-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--accent);
  color: #fff;
  font-size: 0.75rem;
  padding: 4px 12px;
  border-radius: 20px;
  font-weight: 600;
}

/* Intro text block */
.intro-block {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.intro-block p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 14px;
  line-height: 1.85;
}

.intro-block strong { color: var(--text-primary); }

/* Alternating content blocks */
.content-block {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 36px;
  align-items: start;
  margin-bottom: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--border);
}

.content-block:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }

.content-block.reverse { grid-template-columns: 1fr 300px; }

.content-block.reverse .content-block-img { order: 2; }
.content-block.reverse .content-block-text { order: 1; }

.content-block-img img {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  max-height: 540px;
  object-fit: cover;
  object-position: top;
  width: 100%;
}

.content-block-text h3 {
  font-size: 1.25rem;
  margin-bottom: 14px;
  color: var(--text-primary);
}

.content-block-text p {
  color: var(--text-secondary);
  margin-bottom: 12px;
  font-size: 0.92rem;
  line-height: 1.8;
}

.content-block-text ul {
  margin: 10px 0 14px 20px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.content-block-text li { margin-bottom: 6px; }

/* Banner gallery row */
.banner-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.banner-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: transform 0.2s;
}

.banner-card:hover { transform: translateY(-4px); }

.banner-card img {
  width: 100%;
  aspect-ratio: 9/14;
  object-fit: cover;
  object-position: top;
  max-height: 360px;
}

.banner-card .banner-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 14px;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.9));
  font-size: 0.85rem;
  font-weight: 600;
}

/* Guide steps with images */
.guide-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

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

.guide-step img {
  width: 100%;
  aspect-ratio: 9/12;
  object-fit: cover;
  object-position: top;
  max-height: 260px;
}

.guide-step-body { padding: 16px; }

.guide-step-num {
  color: var(--accent);
  font-weight: 700;
  font-size: 0.78rem;
  margin-bottom: 6px;
  letter-spacing: 0.05em;
}

.guide-step h4 { font-size: 0.92rem; margin-bottom: 6px; }
.guide-step p { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.6; }

/* Nav modules */
.nav-modules {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
}

.nav-module {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 14px;
  text-align: center;
}

.nav-module-icon {
  font-size: 1.6rem;
  margin-bottom: 8px;
}

.nav-module h4 { font-size: 0.9rem; margin-bottom: 6px; }
.nav-module p { font-size: 0.78rem; color: var(--text-secondary); line-height: 1.5; }

/* Keyword highlight strip */
.keyword-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  padding: 20px 0;
}

.keyword-strip a,
.keyword-strip span {
  font-size: 0.82rem;
  padding: 6px 14px;
  border-radius: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.keyword-strip a:hover {
  border-color: var(--accent);
  color: var(--accent-light);
}

/* Responsive */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; }
  .hero-grid .hero-cta { justify-content: center; }
  .hero-preview { max-width: 280px; margin: 0 auto; }
  .content-block,
  .content-block.reverse {
    grid-template-columns: 1fr;
  }
  .content-block.reverse .content-block-img,
  .content-block.reverse .content-block-text { order: unset; }
  .content-block-img { max-width: 280px; margin: 0 auto; }
  .banner-row { grid-template-columns: repeat(2, 1fr); }
  .guide-steps { grid-template-columns: repeat(2, 1fr); }
  .nav-modules { grid-template-columns: repeat(3, 1fr); }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .header-inner {
    position: relative;
  }
  .nav-toggle {
    display: block;
    margin-left: auto;
    flex-shrink: 0;
  }
  .header-inner nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 101;
  }
  .main-nav {
    display: none;
    position: static;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: 12px;
    border-bottom: 1px solid var(--border);
  }
  .main-nav.open { display: flex; }
  .feature-grid, .showcase-grid { grid-template-columns: 1fr; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .hero { padding: 40px 0 30px; }
  .banner-row { grid-template-columns: 1fr 1fr; }
  .guide-steps { grid-template-columns: 1fr; }
  .nav-modules { grid-template-columns: repeat(2, 1fr); }
}