/* ==========================================================================
   酷狗音乐 官网 · 纯静态单页样式
   移动优先，≥576 / 768 / 992 / 1200 逐级增强
   ========================================================================== */

:root {
  --brand: #6D28D9;
  --brand-dark: #5B21B6;
  --brand-soft: #EDE9FE;
  --ink: #09090B;
  --text: #1F2937;
  --muted: #6B7280;
  --bg: #FFFFFF;
  --surface: #F7F6F3;
  --accent: #F59E0B;
  --success: #10B981;
  --border: #E5E7EB;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;

  --radius-card: 16px;
  --radius-pill: 9999px;
  --radius-sm: 8px;

  --shadow-card: 0 1px 3px rgba(0, 0, 0, .08), 0 8px 24px rgba(0, 0, 0, .04);
  --shadow-lift: 0 4px 10px rgba(0, 0, 0, .08), 0 16px 32px rgba(0, 0, 0, .06);

  --container: 1200px;
  --header-h: 64px;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-text-size-adjust: 100%;
}

h1, h2, h3 { color: var(--ink); margin: 0 0 var(--space-3); }
h1 { font-size: 30px; line-height: 1.2; font-weight: 700; letter-spacing: -.3px; }
h2 { font-size: 26px; line-height: 1.25; font-weight: 700; }
h3 { font-size: 18px; line-height: 1.4; font-weight: 500; }
p { margin: 0 0 var(--space-3); }
ul { margin: 0; padding: 0; list-style: none; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-dark); }

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--brand);
  color: #fff;
  padding: var(--space-2) var(--space-3);
  z-index: 100;
}
.skip-link:focus { left: var(--space-3); top: var(--space-2); }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
}
.narrow { max-width: 840px; }

/* 区块 */
.section { padding: var(--space-6) 0; }
.section.surface { background: var(--surface); }
.section-head { max-width: 720px; margin: 0 0 var(--space-5); }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-desc { color: var(--muted); font-size: 15px; margin-bottom: 0; }

.tag {
  display: inline-block;
  margin: 0 0 var(--space-2);
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 500;
  color: var(--brand-dark);
  background: var(--brand-soft);
  border-radius: var(--radius-pill);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background-color .2s ease, color .2s ease, transform .2s ease, box-shadow .2s ease;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-lift); }
.btn-ghost { background: #fff; color: var(--ink); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); transform: translateY(-2px); }
.btn-light { background: #fff; color: var(--brand-dark); }
.btn-light:hover { background: #F5F3FF; color: var(--brand-dark); transform: translateY(-2px); }
.btn-sm { padding: 8px 16px; font-size: 14px; }
.btn-lg { padding: 14px 32px; font-size: 16px; }

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .92);
  border-bottom: 1px solid transparent;
  transition: background-color .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.site-header.is-scrolled {
  background: rgba(255, 255, 255, .72);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom-color: var(--border);
  box-shadow: 0 1px 12px rgba(0, 0, 0, .04);
}
.header-inner {
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 700; }
.brand:hover { color: var(--ink); }
.brand-logo { width: 32px; height: 32px; border-radius: var(--radius-sm); }
.brand-name { font-size: 17px; letter-spacing: .2px; }

.nav-toggle {
  position: relative;
  width: 42px;
  height: 42px;
  padding: 0;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}
.nav-toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform .2s ease, opacity .2s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.primary-nav {
  position: fixed;
  inset: var(--header-h) 0 auto 0;
  display: none;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-4) 20px var(--space-5);
  background: #fff;
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-lift);
  max-height: calc(100vh - var(--header-h));
  overflow-y: auto;
}
.primary-nav.is-open { display: flex; }
.nav-list { display: flex; flex-direction: column; }
.nav-list a {
  display: block;
  padding: 12px 4px;
  color: var(--text);
  font-weight: 500;
  border-bottom: 1px solid var(--surface);
}
.nav-list a:hover { color: var(--brand); }
.nav-actions { display: flex; align-items: center; gap: var(--space-3); }
.nav-login { color: var(--muted); font-size: 14px; }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  overflow: hidden;
  padding: var(--space-6) 0;
  background: linear-gradient(180deg, #F5F3FF 0%, #FBFAFF 45%, #FFFFFF 100%);
}
.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  pointer-events: none;
}
.hero-glow-a { width: 320px; height: 320px; top: -120px; right: -80px; background: rgba(109, 40, 217, .18); }
.hero-glow-b { width: 260px; height: 260px; bottom: -120px; left: -80px; background: rgba(245, 158, 11, .14); }
.hero-inner { position: relative; display: grid; gap: var(--space-5); }
.hero-copy h1 { margin-bottom: var(--space-3); }
.hero-sub { color: var(--text); font-size: 16px; margin-bottom: var(--space-4); }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-bottom: var(--space-3); }
.hero-meta { color: var(--muted); font-size: 13px; margin: 0; }
.tag-new { color: #92400E; background: #FEF3C7; }

.hero-visual { position: relative; }
.player-card {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: var(--space-3);
  padding: var(--space-3);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}
.player-cover {
  width: 72px;
  height: 72px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--brand) 0%, #A78BFA 60%, var(--accent) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}
.player-cover-note {
  width: 22px;
  height: 22px;
  border: 2px solid rgba(255, 255, 255, .85);
  border-radius: 50%;
  position: relative;
}
.player-cover-note::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 6px;
  height: 6px;
  margin: -3px 0 0 -3px;
  background: #fff;
  border-radius: 50%;
}
.player-title { margin: 0 0 2px; font-size: 14px; font-weight: 700; color: var(--ink); }
.player-artist { margin: 0 0 var(--space-2); font-size: 12px; color: var(--muted); }
.player-progress {
  height: 4px;
  background: var(--surface);
  border-radius: var(--radius-pill);
  overflow: hidden;
  margin-bottom: var(--space-2);
}
.player-progress span { display: block; width: 62%; height: 100%; background: var(--brand); border-radius: inherit; }
.player-controls { display: flex; align-items: center; gap: 10px; }
.pc { width: 0; height: 0; }
.pc.prev, .pc.next {
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
}
.pc.prev { border-right: 8px solid var(--muted); }
.pc.next { border-left: 8px solid var(--muted); }
.pc.play { width: 18px; height: 18px; border-radius: 50%; background: var(--brand); }

.hero-chip {
  position: absolute;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 500;
  color: var(--brand-dark);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-card);
}
.hero-chip-a { top: -12px; right: 8px; }
.hero-chip-b { bottom: -12px; left: 8px; color: #92400E; }

/* ==========================================================================
   信任条
   ========================================================================== */
.trust-strip { padding: var(--space-5) 0; border-bottom: 1px solid var(--surface); }
.trust-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-3); }
.trust-item {
  padding: var(--space-3);
  background: var(--surface);
  border-radius: var(--radius-card);
  text-align: center;
}
.trust-icon { display: block; font-size: 18px; color: var(--brand); margin-bottom: var(--space-1); }
.trust-num { margin: 0; font-size: 20px; font-weight: 700; color: var(--ink); line-height: 1.3; }
.trust-num span { color: var(--brand); }
.trust-label { margin: 2px 0 0; font-size: 13px; color: var(--muted); }

/* ==========================================================================
   核心功能
   ========================================================================== */
.feature-row { display: grid; gap: var(--space-4); margin-bottom: var(--space-6); }
.feature-row:last-child { margin-bottom: 0; }
.feature-text h3 { font-size: 20px; font-weight: 700; }
.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-bottom: var(--space-3);
  font-size: 18px;
  color: var(--brand);
  background: var(--brand-soft);
  border-radius: var(--radius-sm);
}
.feature-text p { color: var(--text); }
.chip-list { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.chip-list li {
  padding: 4px 12px;
  font-size: 13px;
  color: var(--brand-dark);
  background: var(--brand-soft);
  border-radius: var(--radius-pill);
}
.feature-figure { margin: 0; }
.mock {
  position: relative;
  min-height: 200px;
  padding: var(--space-4);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-2);
}
.mock-bar { display: block; height: 32px; background: var(--surface); border-radius: var(--radius-sm); }
.mock-line { display: block; height: 10px; background: var(--surface); border-radius: var(--radius-pill); }
.mock-line.short { width: 62%; }
.mock-search { background: linear-gradient(160deg, #FFFFFF, #F5F3FF); }

.mock-eq { flex-direction: row; align-items: flex-end; justify-content: center; gap: 10px; }
.eq-bar { width: 14px; border-radius: var(--radius-pill); background: linear-gradient(180deg, var(--brand), #C4B5FD); }
.eq-bar:nth-child(1) { height: 44px; }
.eq-bar:nth-child(2) { height: 84px; }
.eq-bar:nth-child(3) { height: 60px; }
.eq-bar:nth-child(4) { height: 110px; }
.eq-bar:nth-child(5) { height: 72px; }

.mock-ai { align-items: stretch; }
.bubble { display: block; height: 30px; border-radius: 14px; }
.bubble-a { width: 70%; background: var(--brand-soft); }
.bubble-b { width: 50%; align-self: flex-end; background: #FEF3C7; }
.bubble-c { width: 82%; background: var(--surface); }

/* ==========================================================================
   曲库横滑
   ========================================================================== */
.rail {
  display: flex;
  gap: var(--space-3);
  overflow-x: auto;
  padding-bottom: var(--space-3);
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}
.rail-card {
  flex: 0 0 76%;
  scroll-snap-align: start;
  padding: var(--space-3);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition: transform .2s ease;
}
.rail-card:hover { transform: translateY(-4px); }
.rail-card h3 { font-size: 16px; margin: var(--space-2) 0 0; }
.rail-meta { margin: 2px 0 0; font-size: 13px; color: var(--muted); }
.rail-cover { height: 120px; border-radius: 12px; }
.cover-a { background: linear-gradient(135deg, #6D28D9, #A78BFA); }
.cover-b { background: linear-gradient(135deg, #1E1B4B, #6366F1); }
.cover-c { background: linear-gradient(135deg, #F59E0B, #EF4444); }
.cover-d { background: linear-gradient(135deg, #0EA5E9, #22D3EE); }
.cover-e { background: linear-gradient(135deg, #10B981, #84CC16); }
.cover-f { background: linear-gradient(135deg, #8B5CF6, #EC4899); }

/* ==========================================================================
   场景矩阵
   ========================================================================== */
.scene-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-3); }
.scene-card {
  display: flex;
  flex-direction: column;
  padding: var(--space-4);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition: transform .2s ease, box-shadow .2s ease;
}
.scene-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lift); }
.scene-icon { font-size: 22px; margin-bottom: var(--space-2); }
.scene-card h3 { font-size: 16px; margin-bottom: var(--space-1); }
.scene-card p { font-size: 14px; color: var(--muted); margin-bottom: var(--space-3); }
.scene-card a { margin-top: auto; font-weight: 500; font-size: 14px; }
.scene-card a::after { content: " →"; }

/* ==========================================================================
   AI
   ========================================================================== */
.ai-inner { display: grid; gap: var(--space-5); }
.check-list li {
  position: relative;
  padding-left: 26px;
  margin-bottom: var(--space-2);
  font-size: 15px;
}
.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--success);
  font-weight: 700;
}
.ai-copy .btn { margin-top: var(--space-2); }
.ai-card {
  padding: var(--space-4);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}
.ai-card-title { font-weight: 700; color: var(--ink); margin-bottom: var(--space-3); }
.ai-tags { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-3); }
.ai-tags li {
  padding: 3px 10px;
  font-size: 12px;
  color: var(--brand-dark);
  background: var(--brand-soft);
  border-radius: var(--radius-pill);
}
.ai-bubbles { display: flex; flex-direction: column; gap: var(--space-2); margin-bottom: var(--space-4); }
.ai-bubble {
  max-width: 85%;
  margin: 0;
  padding: 8px 14px;
  font-size: 13px;
  border-radius: 14px;
}
.ai-bubble.left { background: var(--surface); color: var(--text); border-bottom-left-radius: 4px; }
.ai-bubble.right { align-self: flex-end; background: var(--brand); color: #fff; border-bottom-right-radius: 4px; }
.ai-songs { display: flex; flex-direction: column; gap: var(--space-2); }
.ai-songs li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: 10px 12px;
  background: var(--surface);
  border-radius: var(--radius-sm);
  font-size: 13px;
}
.ai-song-name { color: var(--ink); font-weight: 500; }
.ai-song-meta { color: var(--muted); font-size: 12px; }

/* ==========================================================================
   多端下载
   ========================================================================== */
.platform-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-3); margin-bottom: var(--space-5); }
.platform-item {
  padding: var(--space-4);
  text-align: center;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}
.platform-icon { display: block; font-size: 22px; color: var(--brand); margin-bottom: var(--space-2); }
.platform-item h3 { font-size: 16px; margin-bottom: var(--space-1); }
.platform-item p { margin: 0; font-size: 13px; color: var(--muted); }

.download-actions { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: var(--space-4); }
.qr-box { text-align: center; }
.qr-placeholder {
  width: 96px;
  height: 96px;
  margin: 0 auto var(--space-2);
  border: 1px dashed var(--border);
  border-radius: 12px;
  background:
    repeating-linear-gradient(45deg, var(--surface) 0 6px, #fff 6px 12px);
}
.qr-box p { margin: 0; font-size: 12px; color: var(--muted); }

/* ==========================================================================
   数据背书
   ========================================================================== */
.stat-grid { display: grid; gap: var(--space-4); margin-bottom: var(--space-5); text-align: center; }
.stat-num { margin: 0; font-size: 30px; font-weight: 700; color: var(--brand); line-height: 1.2; }
.stat-label { margin: 2px 0 0; font-size: 13px; color: var(--muted); }

.quote-grid { display: grid; gap: var(--space-3); margin-bottom: var(--space-5); }
.quote-card {
  padding: var(--space-4);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}
.quote-head { display: flex; align-items: center; gap: var(--space-3); margin-bottom: var(--space-2); }
.avatar {
  width: 40px;
  height: 40px;
  flex: 0 0 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-soft), #DDD6FE);
}
.quote-head h3 { font-size: 14px; margin: 0; }
.stars { margin: 0; font-size: 13px; color: var(--accent); letter-spacing: 1px; }
.quote-card blockquote { margin: 0; font-size: 14px; color: var(--text); }

.partner-strip {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
}
.partner-strip span {
  padding: 8px 16px;
  font-size: 12px;
  color: var(--muted);
  background: #EFEDE8;
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq-item {
  margin-bottom: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
}
.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  cursor: pointer;
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary h3 { font-size: 16px; font-weight: 500; margin: 0; }
.faq-item summary::after {
  content: "+";
  font-size: 20px;
  line-height: 1;
  color: var(--brand);
  transition: transform .2s ease;
}
.faq-item[open] summary::after { content: "−"; }
.faq-item p { margin: var(--space-3) 0 0; font-size: 14px; color: var(--muted); }

/* ==========================================================================
   底部 CTA
   ========================================================================== */
.cta-band {
  padding: var(--space-6) 0;
  background: linear-gradient(135deg, #6D28D9 0%, #7C3AED 55%, #4C1D95 100%);
  color: #fff;
  text-align: center;
}
.cta-band h2 { color: #fff; margin-bottom: var(--space-2); }
.cta-band p { color: rgba(255, 255, 255, .88); margin-bottom: var(--space-4); }
.cta-inner { display: flex; flex-direction: column; align-items: center; }
.cta-actions { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: var(--space-4); }
.cta-back { color: #fff; font-size: 14px; text-decoration: underline; }
.cta-back:hover { color: #fff; }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer { padding-top: var(--space-6); background: #fff; border-top: 1px solid var(--border); }
.footer-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-5) var(--space-4); padding-bottom: var(--space-5); }
.footer-col h3 { font-size: 14px; font-weight: 700; margin-bottom: var(--space-2); }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col a { color: var(--muted); font-size: 14px; }
.footer-col a:hover { color: var(--brand); }
.social-list a { display: inline-flex; align-items: center; gap: 8px; }
.social-list span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  font-size: 11px;
  color: var(--brand);
  background: var(--brand-soft);
  border-radius: var(--radius-sm);
}
.footer-bottom { border-top: 1px solid var(--surface); padding: var(--space-4) 0; }
.footer-bottom-inner { display: flex; flex-direction: column; gap: var(--space-2); font-size: 12px; color: var(--muted); }
.footer-bottom p { margin: 0; }
.footer-legal { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.footer-legal a { color: var(--muted); }
.footer-legal a:hover { color: var(--brand); }

/* ==========================================================================
   占位内容页
   ========================================================================== */
.simple-page { padding: var(--space-6) 0; min-height: 60vh; }
.simple-page h1 { font-size: 28px; }
.simple-page p { color: var(--text); }
.simple-page .back { display: inline-block; margin-top: var(--space-3); }

/* ==========================================================================
   响应式增强
   ========================================================================== */
@media (min-width: 576px) {
  h1 { font-size: 34px; }
  h2 { font-size: 28px; }
  .rail-card { flex-basis: 46%; }
  .scene-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-grid { grid-template-columns: repeat(3, 1fr); }
  .quote-grid { grid-template-columns: repeat(2, 1fr); }
  .download-actions { gap: var(--space-6); }
}

@media (min-width: 768px) {
  :root { --header-h: 72px; }
  h1 { font-size: 40px; }
  h2 { font-size: 30px; }
  .section { padding: 64px 0; }
  .nav-toggle { display: none; }
  .primary-nav {
    position: static;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-4);
    padding: 0;
    background: transparent;
    border: 0;
    box-shadow: none;
    max-height: none;
    overflow: visible;
    flex: 1;
  }
  .nav-list { flex-direction: row; gap: var(--space-4); }
  .nav-list a { padding: 6px 0; border-bottom: 0; font-size: 15px; }
  .hero { padding: 64px 0; }
  .hero-inner { grid-template-columns: 1.05fr .95fr; align-items: center; }
  .player-card { grid-template-columns: 88px 1fr; padding: var(--space-4); }
  .player-cover { width: 88px; height: 88px; }
  .trust-grid { grid-template-columns: repeat(4, 1fr); }
  .feature-row { grid-template-columns: 1fr 1fr; align-items: center; gap: var(--space-5); margin-bottom: 64px; }
  .feature-row.reverse .feature-text { order: 2; }
  .rail-card { flex-basis: 31%; }
  .scene-grid { grid-template-columns: repeat(3, 1fr); }
  .ai-inner { grid-template-columns: 1fr 1fr; align-items: center; }
  .platform-grid { grid-template-columns: repeat(4, 1fr); }
  .quote-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: repeat(4, 1fr); padding-bottom: var(--space-6); }
  .footer-bottom-inner { flex-direction: row; align-items: center; justify-content: space-between; }
}

@media (min-width: 992px) {
  h1 { font-size: 48px; }
  h2 { font-size: 34px; }
  .section { padding: 96px 0; }
  .hero { padding: 96px 0; }
  .hero-sub { font-size: 17px; }
  .rail-card { flex-basis: 23%; }
  .scene-grid { grid-template-columns: repeat(3, 1fr); }
  .stat-num { font-size: 38px; }
}

@media (min-width: 1200px) {
  :root { --container: 1200px; }
  h1 { font-size: 52px; }
  .container { padding: 0 24px; }
  .scene-grid { grid-template-columns: repeat(4, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}

/* ==========================================================================
   新闻资讯：首页摘要区块 / 列表页 / 文章页
   ========================================================================== */
.news-head {
  max-width: none;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-3);
}
.news-head h2 { margin-bottom: var(--space-2); }
.news-all {
  flex: none;
  font-size: 14px;
  font-weight: 700;
  color: var(--brand);
  white-space: nowrap;
  padding-bottom: 2px;
}
.news-all:hover { color: var(--brand-dark); }

/* 卡片网格 */
.news-grid { display: grid; gap: var(--space-3); }
.news-card {
  display: flex;
  flex-direction: column;
  padding: var(--space-4);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.news-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
  border-color: #DDD6FE;
}
.news-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin: 0 0 10px;
  font-size: 12px;
  color: var(--muted);
}
.news-cat {
  padding: 2px 10px;
  font-size: 12px;
  font-weight: 500;
  color: var(--brand-dark);
  background: var(--brand-soft);
  border-radius: var(--radius-pill);
}
.news-card h3 {
  margin: 0 0 10px;
  font-size: 16px;
  line-height: 1.5;
  font-weight: 700;
}
.news-card h3 a { color: var(--ink); }
.news-card h3 a:hover { color: var(--brand); }
.news-excerpt {
  margin: 0 0 var(--space-3);
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-link {
  margin-top: auto;
  align-self: flex-start;
  font-size: 14px;
  font-weight: 700;
  color: var(--brand);
}
.news-link::after { content: " →"; }
.news-link:hover { color: var(--brand-dark); }

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-bottom: var(--space-4);
  font-size: 13px;
  color: var(--muted);
}
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--brand); }
.breadcrumb span[aria-hidden] { color: #C4C4CC; }

/* 列表页 */
.news-page { padding: var(--space-5) 0 var(--space-6); }
.news-page-head { margin-bottom: var(--space-5); }
.news-page-head h1 { font-size: 28px; margin-bottom: var(--space-2); }
.news-page-head p { color: var(--muted); font-size: 15px; max-width: 720px; }
.cat-chips { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-3); }
.cat-chip {
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  transition: background-color .2s ease, color .2s ease, border-color .2s ease;
}
.cat-chip:hover { color: var(--brand-dark); background: var(--brand-soft); border-color: #DDD6FE; }

.news-group { margin-bottom: var(--space-5); scroll-margin-top: calc(var(--header-h) + 24px); }
.news-group h2 {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  font-size: 20px;
  margin-bottom: var(--space-3);
}
.group-count { font-size: 13px; font-weight: 400; color: var(--muted); }

/* 文章页 */
.article-page { padding: var(--space-5) 0 var(--space-6); }
.article-header h1 { font-size: 26px; line-height: 1.35; margin-bottom: var(--space-2); }
.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin: 0 0 var(--space-3);
  font-size: 13px;
  color: var(--muted);
}
.article-lead {
  margin: 0 0 var(--space-4);
  padding: var(--space-3) var(--space-3) var(--space-3) 18px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  background: var(--surface);
  border-left: 3px solid var(--brand);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.article-body { font-size: 16px; line-height: 1.8; color: var(--text); }
.article-body h2 { font-size: 20px; line-height: 1.4; margin: var(--space-5) 0 var(--space-3); }
.article-body h3 { font-size: 17px; font-weight: 700; margin: var(--space-4) 0 var(--space-2); }
.article-body p { margin: 0 0 var(--space-3); }
.article-body ul { margin: 0 0 var(--space-3); padding: 0; list-style: none; }
.article-body li { position: relative; padding-left: 18px; margin-bottom: 8px; }
.article-body li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: .7em;
  width: 6px;
  height: 6px;
  background: var(--brand);
  border-radius: 50%;
}
.article-body a { text-decoration: underline; text-underline-offset: 3px; }

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: var(--space-5) 0 var(--space-4);
  padding-left: 0;
}
.article-tags li { list-style: none; }
.article-tags a,
.article-tags span {
  display: inline-block;
  padding: 4px 12px;
  font-size: 13px;
  color: var(--muted);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
}
.article-tags a:hover { color: var(--brand-dark); border-color: #DDD6FE; background: var(--brand-soft); }

.article-related {
  margin-bottom: var(--space-4);
  padding: var(--space-4);
  background: var(--surface);
  border-radius: var(--radius-card);
}
.article-related h2 { font-size: 16px; margin-bottom: var(--space-2); }
.article-related ul li + li { border-top: 1px solid var(--border); }
.article-related a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  padding: 10px 0;
  font-size: 14px;
  color: var(--ink);
}
.article-related a:hover { color: var(--brand); }
.article-related a span { flex: none; font-size: 12px; color: var(--muted); }

.article-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin: 0;
}

@media (min-width: 576px) {
  .news-grid { grid-template-columns: repeat(2, 1fr); }
  .article-header h1 { font-size: 28px; }
}

@media (min-width: 768px) {
  .news-page-head h1 { font-size: 32px; }
  .news-group h2 { font-size: 22px; }
  .article-page { padding: var(--space-6) 0; }
  .article-header h1 { font-size: 32px; }
  .article-body h2 { font-size: 22px; }
}

@media (min-width: 992px) {
  .news-grid { grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
  .news-card { padding: var(--space-4); }
  .news-page { padding: 64px 0; }
  .news-page-head h1 { font-size: 36px; }
  .article-header h1 { font-size: 36px; }
  .article-body { font-size: 17px; }
}