/* ===== 雷神加速器 全局样式 ===== */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #60a5fa;
  --primary-bg: #eff6ff;
  --accent: #f59e0b;
  --accent-hover: #d97706;

  --bg: #0a1628;
  --bg-hero: #060f20;
  --bg-card: #0f1f3d;
  --bg-section: #0c1932;
  --bg-footer: #060f20;

  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --text-heading: #f1f5f9;

  --border: #1e3a5f;
  --border-light: #2d4a6b;

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 22px;

  --shadow-sm: 0 2px 8px rgba(0,0,0,0.2);
  --shadow: 0 4px 16px rgba(0,0,0,0.25);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.35);
  --shadow-glow: 0 0 24px rgba(37,99,235,0.25);

  --font: "PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;

  --max-width: 1200px;
  --header-h: 68px;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing:border-box; margin:0; padding:0; }
html { font-size:16px; scroll-behavior:smooth; }
body {
  font-family:var(--font);
  color:var(--text);
  background:var(--bg);
  line-height:1.65;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
a { color:var(--primary-light); text-decoration:none; transition:color .2s; }
a:hover { color:var(--accent); }
img { max-width:100%; height:auto; display:block; }
ul { list-style:none; }

/* ===== Utils ===== */
.container { max-width:var(--max-width); margin:0 auto; padding:0 20px; }
.section { padding:80px 0; }
.section-header { text-align:center; margin-bottom:48px; }
.section-tag {
  display:inline-block; font-size:.8rem; font-weight:600; letter-spacing:.06em;
  color:var(--primary-light); background:rgba(37,99,235,.15);
  padding:5px 16px; border-radius:20px; margin-bottom:14px;
}
.section-header h2 { font-size:2rem; font-weight:700; color:var(--text-heading); }
.section-header p { font-size:1.05rem; color:var(--text-muted); margin-top:8px; }

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

/* ===== Fade-in animate ===== */
.fade-in { opacity:0; transform:translateY(24px); transition:opacity .6s,transform .6s; }
.fade-in.visible { opacity:1; transform:translateY(0); }

/* ===== Header ===== */
.site-header {
  position:sticky; top:0; z-index:1000;
  background:rgba(10,22,40,.92); backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border); height:var(--header-h);
}
.header-inner {
  max-width:var(--max-width); margin:0 auto; padding:0 20px;
  display:flex; align-items:center; justify-content:space-between; height:100%;
}
.logo { display:flex; align-items:center; gap:10px; text-decoration:none; }
.logo img { height:40px; width:auto; object-fit:contain; border-radius:10px; }
.logo-text { display:flex; flex-direction:column; line-height:1.25; }
.logo-text strong { font-size:1.05rem; font-weight:700; color:var(--text-heading); }
.logo-text span { font-size:.72rem; color:var(--text-dim); }

.main-nav { display:flex; align-items:center; gap:8px; }
.main-nav a {
  font-size:.9rem; font-weight:500; color:var(--text-muted);
  padding:8px 16px; border-radius:var(--radius-sm); transition:all .2s;
}
.main-nav a:hover, .main-nav a.active { color:var(--primary-light); background:rgba(37,99,235,.1); }
.nav-cta {
  color:#fff !important; background:var(--primary) !important;
  font-weight:600 !important; margin-left:4px;
}
.nav-cta:hover { background:var(--primary-dark) !important; color:#fff !important; }

/* Hamburger */
.nav-toggle { display:none; flex-direction:column; gap:5px; background:none; border:none; cursor:pointer; padding:4px; }
.nav-toggle span { display:block; width:24px; height:2px; background:var(--text); border-radius:1px; transition:all .3s; }

/* ===== Hero ===== */
.hero {
  background:linear-gradient(135deg, var(--bg-hero) 0%, #0d1a35 40%, #0e2045 100%);
  padding:80px 0 70px; position:relative; overflow:hidden;
}
.hero::before {
  content:''; position:absolute; top:-40%; right:-20%;
  width:600px; height:600px;
  background:radial-gradient(circle, rgba(37,99,235,.18) 0%, transparent 70%);
  border-radius:50%; pointer-events:none;
}
.hero::after {
  content:''; position:absolute; bottom:-30%; left:-10%;
  width:500px; height:500px;
  background:radial-gradient(circle, rgba(139,92,246,.1) 0%, transparent 70%);
  border-radius:50%; pointer-events:none;
}
.hero-content { display:flex; align-items:center; gap:50px; position:relative; z-index:1; }
.hero-text { flex:1; }
.hero-badge {
  display:inline-flex; align-items:center; gap:6px;
  background:rgba(37,99,235,.2); color:var(--primary-light);
  font-size:.82rem; font-weight:600; padding:6px 16px; border-radius:20px; margin-bottom:20px;
}
.hero-badge .dot { width:8px; height:8px; background:#22c55e; border-radius:50%; animation:pulse 2s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.4} }
.hero-text h1 { font-size:2.6rem; font-weight:800; color:var(--text-heading); line-height:1.25; margin-bottom:16px; }
.hero-text h1 em { color:var(--primary-light); font-style:normal; }
.hero-text .hero-desc { font-size:1.1rem; color:var(--text-muted); margin-bottom:28px; max-width:520px; }
.hero-stat-row { display:flex; gap:28px; margin-bottom:28px; }
.hero-stat { text-align:center; }
.hero-stat strong { display:block; font-size:1.5rem; font-weight:700; color:var(--text-heading); }
.hero-stat span { font-size:.78rem; color:var(--text-dim); }
.hero-actions { display:flex; gap:12px; flex-wrap:wrap; }
.hero-visual { flex:1; display:flex; justify-content:center; align-items:center; }
.hero-visual svg { max-width:340px; height:auto; filter:drop-shadow(0 0 40px rgba(37,99,235,.3)); }
/* Hero image */
.hero-visual .hero-img {
  max-width:560px; width:100%; border-radius:var(--radius-lg);
  box-shadow:0 8px 40px rgba(37,99,235,.25); border:1px solid var(--border);
}

/* ===== Buttons ===== */
.btn { display:inline-flex; align-items:center; justify-content:center; gap:8px; font-size:.95rem; font-weight:600; padding:12px 28px; border-radius:var(--radius); border:none; cursor:pointer; transition:all .25s; text-decoration:none; white-space:nowrap; }
.btn-primary { background:var(--primary); color:#fff; box-shadow:0 4px 16px rgba(37,99,235,.35); }
.btn-primary:hover { background:var(--primary-dark); color:#fff; transform:translateY(-1px); box-shadow:0 6px 22px rgba(37,99,235,.45); }
.btn-accent { background:var(--accent); color:#0a1628; box-shadow:0 4px 16px rgba(245,158,11,.35); }
.btn-accent:hover { background:var(--accent-hover); color:#0a1628; transform:translateY(-1px); box-shadow:0 6px 22px rgba(245,158,11,.45); }
.btn-outline { background:transparent; color:var(--primary-light); border:2px solid var(--primary); }
.btn-outline:hover { background:rgba(37,99,235,.1); color:var(--primary-light); }
.btn-lg { padding:14px 36px; font-size:1.05rem; }
.btn-sm { padding:8px 18px; font-size:.85rem; }

/* ===== CDK Highlight ===== */
.cdk-badge {
  display:inline-flex; align-items:center; gap:8px;
  background:linear-gradient(135deg, rgba(245,158,11,.2), rgba(37,99,235,.2));
  border:1px solid rgba(245,158,11,.5); border-radius:var(--radius);
  padding:10px 22px; font-size:.9rem; font-weight:700;
  color:var(--accent); margin:12px 0;
  animation: cdkGlow 2.5s ease-in-out infinite;
}
@keyframes cdkGlow {
  0%,100% { box-shadow:0 0 8px rgba(245,158,11,.2); }
  50% { box-shadow:0 0 18px rgba(245,158,11,.4); }
}
.cdk-code {
  display:inline-block; background:rgba(0,0,0,.3); border:1px dashed var(--accent);
  padding:4px 14px; border-radius:var(--radius-sm); font-family:monospace;
  font-size:1.1rem; letter-spacing:.08em; color:#fff;
}
.cdk-notice-card {
  max-width:600px; margin:0 auto 32px;
  background:linear-gradient(135deg, rgba(245,158,11,.08), rgba(37,99,235,.08));
  border:1px solid rgba(245,158,11,.35); border-radius:var(--radius-lg);
  padding:20px 24px; text-align:center;
}
.cdk-notice-card h4 { font-size:1rem; color:var(--accent); margin-bottom:6px; }
.cdk-notice-card .cdk-code { margin:6px 0 8px; }
.cdk-notice-card p { font-size:.82rem; color:var(--text-muted); }

/* ===== Download Button System ===== */
.download-btns { display:flex; gap:12px; flex-wrap:wrap; justify-content:center; margin-top:20px; }
.download-btn {
  display:inline-flex; align-items:center; gap:8px;
  font-size:.95rem; font-weight:600; border:none; cursor:pointer;
  padding:13px 28px; border-radius:var(--radius); transition:all .25s; text-decoration:none;
}
.download-btn.baidu { background:#2b8af0; color:#fff; box-shadow:0 4px 16px rgba(43,138,240,.35); }
.download-btn.baidu:hover { background:#2270c8; color:#fff; transform:translateY(-1px); box-shadow:0 6px 22px rgba(43,138,240,.45); }
.download-btn.quark { background:#1a73e8; color:#fff; box-shadow:0 4px 16px rgba(26,115,232,.35); }
.download-btn.quark:hover { background:#1557b0; color:#fff; transform:translateY(-1px); box-shadow:0 6px 22px rgba(26,115,232,.45); }

/* ===== Features Grid ===== */
.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-lg); padding:32px 24px; text-align:center;
  transition:all .3s;
}
.feature-card:hover { transform:translateY(-4px); border-color:var(--primary); box-shadow:var(--shadow-glow); }
.feature-icon { font-size:2.4rem; margin-bottom:14px; display:block; }
.feature-card h3 { font-size:1.15rem; font-weight:700; color:var(--text-heading); margin-bottom:8px; }
.feature-card p { font-size:.9rem; color:var(--text-muted); }

/* ===== Game Support ===== */
.game-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(140px,1fr)); gap:16px; }
.game-item {
  background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius);
  padding:20px 12px; text-align:center; font-size:.88rem; font-weight:500;
  color:var(--text-muted); transition:all .25s; cursor:default;
}
.game-item:hover { border-color:var(--primary-light); color:var(--primary-light); transform:translateY(-2px); }

/* ===== Game Image Gallery ===== */
.game-img-grid {
  display:grid; grid-template-columns:repeat(4,1fr); gap:20px;
}
.game-img-card {
  position:relative; border-radius:var(--radius-lg); overflow:hidden;
  background:var(--bg-card); border:1px solid var(--border);
  transition:all .3s; cursor:pointer;
}
.game-img-card:hover { border-color:var(--primary-light); transform:translateY(-4px); box-shadow:0 8px 32px rgba(37,99,235,.25); }
.game-img-card img {
  width:100%; height:160px; object-fit:cover; display:block;
  transition:transform .4s;
}
.game-img-card:hover img { transform:scale(1.08); }
.game-img-name {
  padding:12px 10px; text-align:center; font-size:.88rem; font-weight:600;
  color:var(--text-heading); background:var(--bg-card);
}

/* ===== Feature Image Cards ===== */
.feature-img-grid {
  display:grid; grid-template-columns:repeat(2,1fr); gap:24px;
}
.feature-img-card {
  position:relative; border-radius:var(--radius-lg); overflow:hidden;
  border:1px solid var(--border); cursor:default;
  transition:all .3s;
}
.feature-img-card:hover { border-color:var(--primary-light); transform:translateY(-4px); box-shadow:0 8px 32px rgba(37,99,235,.25); }
.feature-img-card img {
  width:100%; height:auto; aspect-ratio:16/10; object-fit:contain; display:block;
  background:var(--bg-card); transition:transform .5s;
}
.feature-img-card:hover img { transform:scale(1.05); }
.feature-img-overlay {
  position:absolute; bottom:0; left:0; right:0;
  background:linear-gradient(transparent, rgba(6,15,32,.92));
  padding:28px 24px 24px;
}
.feature-img-overlay h3 {
  font-size:1.15rem; font-weight:700; color:#fff; margin-bottom:4px;
}
.feature-img-overlay p {
  font-size:.85rem; color:rgba(255,255,255,.7);
}

/* ===== Stats Section ===== */
.stats-row { display:grid; grid-template-columns:repeat(4,1fr); gap:32px; text-align:center; }
.stat-item { padding:32px 20px; }
.stat-item .stat-num { font-size:2.6rem; font-weight:800; color:var(--primary-light); line-height:1.2; }
.stat-item .stat-label { font-size:.9rem; color:var(--text-muted); margin-top:8px; }

/* ===== Steps ===== */
.steps-list { display:grid; grid-template-columns:repeat(4,1fr); gap:24px; }
.step-item { text-align:center; position:relative; }
.step-num {
  display:flex; align-items:center; justify-content:center;
  width:52px; height:52px; border-radius:50%; margin:0 auto 16px;
  background:var(--primary); color:#fff; font-size:1.3rem; font-weight:700;
}
.step-item h4 { font-size:1rem; font-weight:700; color:var(--text-heading); margin-bottom:6px; }
.step-item p { font-size:.85rem; color:var(--text-muted); }

/* ===== Platforms ===== */
.platform-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:20px; }
.platform-card {
  background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius-lg);
  padding:32px 20px; text-align:center; transition:all .3s;
}
.platform-card:hover { border-color:var(--primary-light); transform:translateY(-3px); }
.platform-icon { font-size:2.6rem; margin-bottom:12px; display:block; }
.platform-card h4 { font-size:1rem; font-weight:700; color:var(--text-heading); }

/* ===== Platform Logo Strip ===== */
.platform-logo-strip {
  display:flex; flex-wrap:wrap; justify-content:center; align-items:center; gap:20px;
}
.platform-logo-item {
  background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius);
  padding:16px 24px; transition:all .3s; display:flex; align-items:center; justify-content:center;
}
.platform-logo-item:hover {
  border-color:var(--primary-light); transform:translateY(-3px);
  box-shadow:0 4px 20px rgba(37,99,235,.2);
}
.platform-logo-item img { height:36px; width:auto; max-width:100px; object-fit:contain; }

/* ===== FAQ ===== */
.faq-list { max-width:780px; margin:0 auto; }
.faq-item { border:1px solid var(--border); border-radius:var(--radius); margin-bottom:8px; overflow:hidden; transition:border-color .2s; }
.faq-item.open { border-color:var(--primary-light); }
.faq-q {
  display:flex; align-items:center; justify-content:space-between;
  padding:16px 20px; cursor:pointer; background:var(--bg-card); user-select:none;
  transition:background .2s;
}
.faq-q:hover { background:rgba(37,99,235,.08); }
.faq-q-text { font-size:.95rem; font-weight:600; color:var(--text-heading); }
.faq-icon { font-size:1.2rem; color:var(--text-dim); transition:transform .3s; font-weight:300; }
.faq-item.open .faq-icon { transform:rotate(45deg); color:var(--primary-light); }
.faq-a { max-height:0; overflow:hidden; transition:max-height .4s ease; background:rgba(37,99,235,.04); }
.faq-item.open .faq-a { max-height:600px; }
.faq-a-inner { padding:18px 20px 22px; color:var(--text-muted); font-size:.9rem; line-height:1.75; }
.faq-a-inner p { margin-bottom:8px; }
.faq-a-inner p:last-child { margin-bottom:0; }
.faq-a-inner strong { color:var(--text); }

/* ===== Pricing / Comparison ===== */
.compare-table { width:100%; border-collapse:separate; border-spacing:0; border-radius:var(--radius-lg); overflow:hidden; border:1px solid var(--border); }
.compare-table th, .compare-table td { padding:14px 20px; text-align:center; font-size:.88rem; }
.compare-table thead th { background:var(--primary); color:#fff; font-weight:600; font-size:.9rem; }
.compare-table thead th:first-child { border-radius:var(--radius-lg) 0 0 0; }
.compare-table thead th:last-child { border-radius:0 var(--radius-lg) 0 0; }
.compare-table tbody td { background:var(--bg-card); color:var(--text-muted); border-bottom:1px solid var(--border); }
.compare-table tbody tr:last-child td:first-child { border-radius:0 0 0 var(--radius-lg); }
.compare-table tbody tr:last-child td:last-child { border-radius:0 0 var(--radius-lg) 0; }
.compare-table .highlight { color:var(--primary-light); font-weight:600; }
.compare-table .check { color:#22c55e; font-weight:600; }
.compare-table .cross { color:#ef4444; }

/* ===== CTA Section ===== */
.cta-section {
  background:linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, #3b82f6 100%);
  padding:70px 0; text-align:center; position:relative; overflow:hidden;
}
.cta-section::before {
  content:''; position:absolute; top:-50%; right:-20%;
  width:500px; height:500px; background:radial-gradient(circle, rgba(255,255,255,.08) 0%, transparent 70%);
  border-radius:50%; pointer-events:none;
}
.cta-section h2 { font-size:2rem; font-weight:700; color:#fff; margin-bottom:12px; position:relative; z-index:1; }
.cta-section p { color:rgba(255,255,255,.75); margin-bottom:28px; position:relative; z-index:1; }
.cta-section .btn-container { position:relative; z-index:1; }

/* ===== Page Hero (subpages) ===== */
.page-hero {
  background:linear-gradient(135deg, var(--bg-hero) 0%, #0d1a35 50%, #0e2045 100%);
  padding:56px 0; text-align:center;
}
.page-hero h1 { font-size:2.2rem; font-weight:800; color:var(--text-heading); margin-bottom:10px; }
.page-hero p { font-size:1rem; color:var(--text-muted); }

/* ===== Breadcrumb ===== */
.breadcrumb { background:var(--bg-section); border-bottom:1px solid var(--border); }
.breadcrumb-inner {
  max-width:var(--max-width); margin:0 auto; padding:12px 20px;
  display:flex; align-items:center; gap:8px; font-size:.85rem; color:var(--text-dim);
}
.breadcrumb-inner a { color:var(--text-muted); }
.breadcrumb-inner a:hover { color:var(--primary-light); }
.breadcrumb-sep { color:var(--text-dim); }

/* ===== Download page specific ===== */
.dl-info-card {
  background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius-lg);
  padding:32px 28px; max-width:560px; margin:0 auto 40px;
}
.dl-info-card .dl-name { font-size:1.3rem; font-weight:700; color:var(--text-heading); margin-bottom:4px; }
.dl-info-card .dl-ver { font-size:.85rem; color:var(--text-dim); margin-bottom:20px; }
.dl-info-row { display:flex; justify-content:space-between; align-items:center; padding:10px 0; border-bottom:1px solid var(--border); }
.dl-info-row:last-child { border-bottom:none; }
.dl-info-row .label { font-size:.88rem; color:var(--text-dim); }
.dl-info-row .value { font-size:.88rem; color:var(--text-heading); font-weight:500; }
.dl-notice {
  background:rgba(245,158,11,.1); border:1px solid rgba(245,158,11,.25);
  border-radius:var(--radius); padding:16px 20px; font-size:.85rem; color:var(--accent);
  max-width:560px; margin:0 auto 40px; line-height:1.7;
}
.dl-notice strong { display:block; margin-bottom:4px; }

/* ===== Tutorial sidebar layout ===== */
.tutorial-layout { display:flex; gap:40px; }
.sidebar-nav { width:220px; flex-shrink:0; position:sticky; top:calc(var(--header-h) + 20px); align-self:flex-start; }
.sidebar-nav a {
  display:block; padding:10px 16px; font-size:.85rem; color:var(--text-muted);
  border-left:2px solid transparent; transition:all .2s; border-radius:0 var(--radius-sm) var(--radius-sm) 0;
}
.sidebar-nav a:hover { color:var(--primary-light); }
.sidebar-nav a.active { color:var(--primary-light); border-left-color:var(--primary); background:rgba(37,99,235,.08); }
.tutorial-content { flex:1; min-width:0; }

/* ===== Footer ===== */
.site-footer { background:var(--bg-footer); border-top:1px solid var(--border); padding:56px 0 0; }
.footer-inner { max-width:var(--max-width); margin:0 auto; padding:0 20px; }
.footer-top { display:grid; grid-template-columns:1.5fr 1fr 1fr 1fr; gap:40px; padding-bottom:40px; }
.footer-brand .logo { margin-bottom:14px; }
.footer-brand p { font-size:.85rem; color:var(--text-dim); margin-bottom:12px; }
.footer-col h4 { font-size:.9rem; font-weight:700; color:var(--text-heading); margin-bottom:14px; }
.footer-col li { margin-bottom:8px; }
.footer-col a { font-size:.85rem; color:var(--text-dim); }
.footer-col a:hover { color:var(--primary-light); }
.footer-divider { border:none; border-top:1px solid var(--border); }
.footer-bottom { display:flex; justify-content:space-between; align-items:center; padding:20px 0 28px; }
.footer-copy { font-size:.82rem; color:var(--text-dim); }
.footer-links { display:flex; gap:18px; }
.footer-links a { font-size:.82rem; color:var(--text-dim); }

/* ===== Back to top ===== */
#backToTop {
  position:fixed; bottom:32px; right:32px; z-index:999;
  width:44px; height:44px; border-radius:50%; border:none; cursor:pointer;
  background:var(--primary); color:#fff; font-size:1.2rem;
  opacity:0; visibility:hidden; transition:all .3s;
  box-shadow:0 4px 16px rgba(37,99,235,.4);
}
#backToTop.visible { opacity:1; visibility:visible; }
#backToTop:hover { background:var(--primary-dark); transform:translateY(-2px); }

/* ===== Download Modal ===== */
.download-modal-overlay {
  position:fixed; inset:0; z-index:9999;
  background:rgba(0,0,0,.7); display:flex; align-items:center; justify-content:center;
  opacity:0; visibility:hidden; transition:all .3s;
}
.download-modal-overlay.open { opacity:1; visibility:visible; }
.download-modal {
  background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius-xl);
  padding:36px 32px; text-align:center; max-width:400px; width:90%; position:relative;
  box-shadow:0 20px 60px rgba(0,0,0,.5);
}
.modal-close {
  position:absolute; top:12px; right:16px; background:none; border:none;
  font-size:1.6rem; color:var(--text-dim); cursor:pointer; line-height:1;
}
.modal-close:hover { color:var(--text); }
.download-modal-title { font-size:1.15rem; font-weight:700; color:var(--text-heading); margin-bottom:18px; }
.qrcode-wrapper { display:flex; justify-content:center; margin-bottom:14px; }
.qrcode-wrapper .qrcode-img { width:180px; height:180px; display:block; }
/* QR code bouncing border — subtle pulse */
@keyframes qrcodeBorderPulse {
  0%, 100% {
    box-shadow: 0 0 0 2px rgba(37,99,235,0.25), 0 0 12px rgba(37,99,235,0.08);
  }
  50% {
    box-shadow: 0 0 0 3px rgba(96,165,250,0.45), 0 0 20px rgba(37,99,235,0.16);
  }
}
.qrcode-bounce {
  animation: qrcodeBorderPulse 2.2s ease-in-out infinite;
}
.download-modal-text { font-size:.85rem; color:var(--text-muted); margin-bottom:6px; }
.download-modal-sub { font-size:.78rem; color:var(--text-dim); margin-bottom:14px; }
.download-modal-warn {
  font-size:.75rem; color:#ef4444; background:rgba(239,68,68,.08);
  padding:10px 14px; border-radius:var(--radius-sm); margin-bottom:18px; line-height:1.5;
}
.download-modal-actions { display:flex; justify-content:center; }

/* ===== 内联二维码（下载页按钮下方） ===== */
.qrcode-inline-wrap {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-top: 18px;
  flex-wrap: wrap;
}
.qrcode-inline-item {
  text-align: center;
}
.qrcode-inline-item .qrcode-img {
  width: 120px;
  height: 120px;
  border-radius: var(--radius);
  background: #fff;
  padding: 4px;
}
.qrcode-inline-text {
  font-size: .72rem;
  color: var(--text-dim);
  margin-top: 8px;
}

/* ===== Responsive ===== */
@media (max-width:1024px) {
  .features-grid { grid-template-columns:repeat(2,1fr); }
  .steps-list { grid-template-columns:repeat(2,1fr); }
  .platform-grid { grid-template-columns:repeat(2,1fr); }
  .stats-row { grid-template-columns:repeat(2,1fr); }
  .hero-content { flex-direction:column; text-align:center; }
  .hero-text .hero-desc { max-width:100%; }
  .hero-stat-row { justify-content:center; }
  .hero-actions { justify-content:center; }
  .hero-visual svg { max-width:260px; }
  .hero-visual .hero-img { max-width:380px; }
  .game-img-grid { grid-template-columns:repeat(3,1fr); }
  .feature-img-grid { grid-template-columns:1fr; }
  .feature-img-card img { aspect-ratio:16/9; }
  .footer-top { grid-template-columns:1fr 1fr; }
  .tutorial-layout { flex-direction:column; }
  .sidebar-nav { width:100%; position:static; display:flex; flex-wrap:wrap; gap:4px; }
  .sidebar-nav a { border-left:none; border-bottom:2px solid transparent; border-radius:var(--radius-sm); padding:8px 12px; }
  .sidebar-nav a.active { border-left:none; border-bottom-color:var(--primary); }
}

@media (max-width:768px) {
  .section { padding:48px 0; }
  .hero { padding:48px 0; }
  .hero-text h1 { font-size:1.8rem; }
  .features-grid { grid-template-columns:1fr; }
  .steps-list { grid-template-columns:1fr; }
  .platform-grid { grid-template-columns:1fr 1fr; }
  .stats-row { grid-template-columns:repeat(2,1fr); gap:16px; }
  .stat-item .stat-num { font-size:1.8rem; }
  .game-grid { grid-template-columns:repeat(auto-fill,minmax(110px,1fr)); gap:10px; }
  .game-img-grid { grid-template-columns:repeat(2,1fr); gap:12px; }
  .game-img-card img { height:130px; }
  .feature-img-card img { aspect-ratio:4/3; }
  .platform-logo-item { padding:12px 16px; }
  .platform-logo-item img { height:28px; }

  .main-nav { display:none; flex-direction:column; position:absolute; top:var(--header-h); left:0; right:0;
    background:rgba(10,22,40,.97); padding:16px 20px; gap:4px; border-bottom:1px solid var(--border);
    backdrop-filter:blur(12px);
  }
  .main-nav.open { display:flex; }
  .main-nav a { font-size:.95rem; padding:12px 16px; border-radius:var(--radius); }
  .nav-toggle { display:flex; }
  .nav-cta { margin-left:0; margin-top:8px; justify-content:center; }
  .footer-top { grid-template-columns:1fr; gap:28px; }
  .footer-bottom { flex-direction:column; gap:10px; text-align:center; }
  .compare-table { font-size:.78rem; }
  .compare-table th, .compare-table td { padding:10px 8px; }
}

@media (max-width:480px) {
  .hero-text h1 { font-size:1.45rem; }
  .hero-stat-row { gap:16px; }
  .hero-stat strong { font-size:1.15rem; }
  .btn { font-size:.85rem; padding:10px 20px; }
  .btn-lg { padding:12px 26px; }
  .section-header h2 { font-size:1.4rem; }
}