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

:root {
  --primary:#FF4B3E;
  --primary-light:#FF8A70;
  --primary-muted:#FFF0EC;
  --teal:#00C7A9;
  --teal-muted:#E0F7F2;
  --lavender:#7357F6;
  --lavender-muted:#EFEDFF;
  --gold:#FFC53D;
  --gold-muted:#FFF6E0;
  --ink:#1E1E1E;
  --ink-soft:#6B6B6B;
  --paper:#FFFCF8;
  --paper-alt:#FFF1EC;
  --card:#FFFFFF;
  --ring:rgba(255,75,62,.15);
  --shadow-sm:0 4px 24px rgba(30,30,30,.05);
  --shadow-md:0 12px 48px rgba(30,30,30,.08);
  --shadow-lg:0 24px 64px rgba(255,75,62,.14);
  --rad-xl:28px;
  --rad-lg:20px;
  --rad-md:14px;
  --rad-sm:10px;
  --ease-bounce:cubic-bezier(.34,1.56,.64,1);
}

body {
  font-family: system-ui,'PingFang SC','Microsoft YaHei',sans-serif;
  overflow-x:hidden;
  background:var(--paper);
  color:var(--ink);
  -webkit-font-smoothing:antialiased;
  line-height:1.6;
}

.container { max-width:1200px; margin:0 auto; padding:0 24px; }
.section { padding:100px 0; position:relative; }
.section:nth-child(even) { background:linear-gradient(180deg,var(--paper-alt),#fff8f5); }

/* ===== 工具类 ===== */
.text-accent { color:var(--primary); }
.text-center { text-align:center; }
.seo-description { max-width:600px; margin:0 auto 48px; opacity:.72; font-size:1.02rem; }
.mt-0 { margin-top:0; }
.mb-0 { margin-bottom:0; }

/* ===== 导航 ===== */
.site-header {
  position:fixed; top:0; left:0; width:100%; z-index:1000;
  background:rgba(255,252,248,.78);
  backdrop-filter:blur(22px) saturate(190%);
  -webkit-backdrop-filter:blur(22px) saturate(190%);
  border-bottom:1px solid rgba(30,30,30,.06);
  transition:box-shadow .35s ease;
}
.site-header:hover { box-shadow:0 8px 40px rgba(30,30,30,.04); }
.header-inner {
  display:flex; align-items:center; justify-content:space-between;
  height:72px; max-width:1200px; margin:0 auto; padding:0 24px;
}
.logo { display:flex; align-items:center; gap:10px; font-weight:800; font-size:1.25rem; text-decoration:none; color:var(--ink); letter-spacing:-.5px; }
.logo-icon {
  width:38px; height:38px; border-radius:12px;
  background:linear-gradient(135deg,var(--primary),var(--gold));
  color:#fff; display:flex; align-items:center; justify-content:center;
  font-size:.95rem; box-shadow:0 6px 20px rgba(255,75,62,.35);
  animation:logoFloat 3s ease-in-out infinite;
}
.main-nav { display:flex; align-items:center; gap:28px; list-style:none; }
.main-nav a {
  text-decoration:none; font-size:.92rem; font-weight:500;
  color:rgba(30,30,30,.72); position:relative; padding:4px 2px;
  letter-spacing:.3px; transition:color .25s ease;
}
.main-nav a::after {
  content:''; position:absolute; left:0; bottom:-2px; width:0; height:2px;
  background:linear-gradient(90deg,var(--primary),var(--gold));
  border-radius:2px; transition:width .4s var(--ease-bounce);
}
.main-nav a:hover { color:var(--ink); }
.main-nav a:hover::after { width:100%; }
.nav-cta {
  padding:9px 24px; border-radius:100px; color:#fff!important;
  background:linear-gradient(135deg,var(--primary),#ff6f5e);
  font-weight:700!important; box-shadow:0 6px 18px rgba(255,75,62,.32);
  transition:transform .3s var(--ease-bounce),box-shadow .3s ease!important;
}
.nav-cta:hover { transform:translateY(-2px); box-shadow:0 10px 28px rgba(255,75,62,.42); }
.nav-cta::after { display:none; }
.menu-toggle {
  display:none; border:none; background:none; cursor:pointer;
  width:42px; height:42px; position:relative; border-radius:10px;
}
.menu-toggle::before {
  content:''; position:absolute; top:13px; left:11px; width:20px; height:2px;
  background:var(--ink); border-radius:2px;
  box-shadow:0 7px 0 var(--ink),0 14px 0 var(--ink);
  transition:transform .3s ease;
}

/* ===== Hero ===== */
.hero {
  position:relative; min-height:86vh; display:flex; align-items:center;
  padding:140px 0 80px; overflow:hidden;
  background:linear-gradient(140deg,#FFF0EA 0%,var(--paper) 55%,#EDF9F5 100%);
}
.hero::before {
  content:'📺 ACFUN 弹幕天下 · 极速下载 · 弹幕狂欢';
  position:absolute; top:18%; left:0; white-space:nowrap;
  font-size:2rem; font-weight:900; color:var(--primary); opacity:.07;
  z-index:0; animation:danmakuMove 26s linear infinite; pointer-events:none;
}
.hero::after {
  content:'🔥 高清视界 · 全弹幕同步 · 一键存档';
  position:absolute; top:72%; left:0; white-space:nowrap;
  font-size:1.4rem; font-weight:700; color:var(--teal); opacity:.05;
  z-index:0; animation:danmakuMove 38s linear infinite reverse; pointer-events:none;
}
.hero-content { position:relative; z-index:1; max-width:720px; }
.hero-eyebrow {
  display:inline-flex; align-items:center; gap:6px;
  font-size:.8rem; font-weight:800; padding:6px 18px; border-radius:100px;
  background:linear-gradient(135deg,var(--primary-muted),var(--gold-muted));
  color:var(--primary); letter-spacing:1px; text-transform:uppercase;
  margin-bottom:20px; box-shadow:inset 0 1px 0 rgba(255,255,255,.8);
}
.hero-eyebrow::before { content:'⚡'; font-size:1rem; }
.hero h1 {
  font-size:clamp(2.6rem,6vw,4.4rem); line-height:1.08;
  font-weight:900; letter-spacing:-3px; margin-bottom:20px;
  color:var(--ink);
}
.hero h1::after {
  content:'弹幕'; display:inline-block;
  background:linear-gradient(135deg,var(--primary),#ff6f5e);
  color:#fff; padding:.12em .35em; border-radius:.2em;
  font-size:.32em; vertical-align:middle; margin-left:.2em;
  font-weight:800; letter-spacing:0; box-shadow:0 8px 24px rgba(255,75,62,.3);
}
.hero p {
  font-size:1.1rem; opacity:.68; max-width:560px; margin-bottom:36px;
  line-height:1.7; color:var(--ink-soft);
}
.hero-buttons { display:flex; gap:14px; flex-wrap:wrap; }
.hero-image {
  position:relative; border-radius:var(--rad-xl); overflow:hidden;
  box-shadow:var(--shadow-md);
}
.hero-image img {
  width:100%; height:auto; display:block;
  transition:transform .6s cubic-bezier(.23,1,.32,1);
}
.hero-image:hover img { transform:scale(1.03); }
.hero-image::after {
  content:'🔥 当前热门 · 弹幕 2.4万';
  position:absolute; bottom:16px; left:16px;
  background:rgba(30,30,30,.62); backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  color:#fff; padding:7px 16px; border-radius:100px;
  font-size:.8rem; font-weight:600; letter-spacing:.4px;
  border:1px solid rgba(255,255,255,.18);
}

/* ===== 按钮 ===== */
.btn {
  display:inline-flex; align-items:center; gap:8px;
  padding:14px 30px; border-radius:100px; font-weight:700;
  cursor:pointer; border:none; text-decoration:none;
  font-size:.92rem; letter-spacing:.4px;
  transition:transform .3s var(--ease-bounce),box-shadow .3s ease,background .3s ease;
}
.btn-primary {
  background:linear-gradient(135deg,var(--primary),#ff6f5e);
  color:#fff; box-shadow:0 8px 24px rgba(255,75,62,.35);
}
.btn-primary:hover { transform:translateY(-3px); box-shadow:0 14px 34px rgba(255,75,62,.45); }
.btn-outline {
  background:transparent; border:2px solid rgba(30,30,30,.18);
  color:var(--ink); box-shadow:none;
}
.btn-outline:hover { border-color:var(--primary); color:var(--primary); transform:translateY(-3px); box-shadow:var(--shadow-sm); }

/* ===== 标题/标签 ===== */
.section-label {
  display:inline-block; font-size:.78rem; font-weight:800;
  letter-spacing:4px; margin-bottom:14px; text-transform:uppercase;
  color:var(--primary); position:relative;
}
.section-label::before { content:'◆'; margin-right:6px; font-size:.6rem; }
.section-title { font-size:clamp(1.8rem,3.5vw,2.6rem); font-weight:900; margin-bottom:14px; line-height:1.2; letter-spacing:-1px; }
.section-desc { max-width:620px; opacity:.7; margin-bottom:48px; font-size:1.02rem; color:var(--ink-soft); }

/* ===== 卡片网格 ===== */
.cards-grid {
  display:grid; grid-template-columns:repeat(auto-fill,minmax(260px,1fr));
  gap:28px; position:relative;
}
.category-card {
  position:relative; border-radius:var(--rad-lg); padding:32px 28px;
  background:var(--card); border:1px solid rgba(30,30,30,.05);
  box-shadow:var(--shadow-sm); overflow:hidden;
  transition:transform .45s var(--ease-bounce),box-shadow .4s ease,border-color .3s ease;
}
.category-card::before {
  content:''; position:absolute; top:0; left:0; width:100%; height:4px;
  background:linear-gradient(90deg,var(--primary),transparent);
  opacity:0; transition:opacity .35s ease;
}
.category-card::after {
  content:'→'; position:absolute; right:18px; bottom:14px;
  width:38px; height:38px; border-radius:50%;
  background:var(--primary); color:#fff; display:flex;
  align-items:center; justify-content:center; font-size:1rem; font-weight:700;
  opacity:0; transform:translateY(8px); transition:opacity .35s ease,transform .35s var(--ease-bounce);
  box-shadow:0 6px 16px rgba(255,75,62,.3);
}
.category-card:hover {
  transform:translateY(-6px); box-shadow:var(--shadow-md);
  border-color:transparent;
}
.category-card:hover::before { opacity:1; }
.category-card:hover::after { opacity:1; transform:translateY(0); }
.category-card:nth-child(1) .card-icon { background:var(--primary-muted); color:var(--primary); }
.category-card:nth-child(2) .card-icon { background:var(--teal-muted); color:var(--teal); }
.category-card:nth-child(3) .card-icon { background:var(--lavender-muted); color:var(--lavender); }
.category-card:nth-child(4) .card-icon { background:var(--gold-muted); color:var(--gold); }
.card-icon {
  width:52px; height:52px; border-radius:16px;
  display:flex; align-items:center; justify-content:center;
  margin-bottom:18px; font-size:1.5rem; transition:transform .35s var(--ease-bounce);
}
.category-card:hover .card-icon { transform:scale(1.1) rotate(-6deg); }
.card-link { font-weight:700; font-size:.85rem; text-decoration:none; color:var(--primary); display:inline-flex; align-items:center; gap:4px; transition:gap .3s ease; }
.card-link:hover { gap:8px; }

/* ===== 特性块 ===== */
.feature-block {
  display:grid; grid-template-columns:1fr 1fr; gap:64px; align-items:center;
  position:relative;
}
.feature-image {
  position:relative; border-radius:var(--rad-xl); overflow:hidden;
  box-shadow:var(--shadow-md);
}
.feature-image img { width:100%; height:auto; display:block; transition:transform .6s ease; }
.feature-image:hover img { transform:scale(1.04); }
.feature-image::before {
  content:'📺 1080P · 全集缓存'; position:absolute; top:16px; left:16px;
  background:rgba(255,255,255,.75); backdrop-filter:blur(10px);
  color:var(--ink); padding:5px 14px; border-radius:100px;
  font-size:.75rem; font-weight:700; letter-spacing:.3px;
  box-shadow:0 4px 12px rgba(0,0,0,.06);
}
.feature-list { list-style:none; margin-top:24px; }
.feature-list li {
  padding:10px 0; display:flex; align-items:center; gap:12px;
  font-size:1rem; color:var(--ink-soft); font-weight:500;
  border-bottom:1px dashed rgba(30,30,30,.08);
}
.feature-list li:last-child { border-bottom:none; }
.feature-list li::before {
  content:'✓'; flex-shrink:0; width:24px; height:24px;
  border-radius:50%; background:var(--teal-muted); color:var(--teal);
  display:flex; align-items:center; justify-content:center;
  font-size:.7rem; font-weight:900; box-shadow:inset 0 0 0 4px #fff;
}
.feature-text .section-title { margin-bottom:16px; }

/* ===== 数据条 ===== */
.stats-bar {
  display:grid; grid-template-columns:repeat(4,1fr); gap:24px; text-align:center;
}
.stat-item {
  padding:36px 20px; border-radius:var(--rad-lg);
  background:var(--card); border:1px solid rgba(30,30,30,.05);
  box-shadow:var(--shadow-sm); position:relative; overflow:hidden;
  transition:transform .4s var(--ease-bounce),box-shadow .4s ease;
}
.stat-item::before {
  content:''; position:absolute; left:50%; transform:translateX(-50%);
  bottom:-30px; width:90px; height:90px; border-radius:50%;
  background:var(--primary-muted); opacity:.5; transition:transform .4s ease;
}
.stat-item:hover { transform:translateY(-4px); box-shadow:var(--shadow-md); }
.stat-item:hover::before { transform:translateX(-50%) scale(1.5); }
.stat-number {
  font-size:clamp(2rem,3.5vw,2.8rem); font-weight:900; letter-spacing:-2px;
  background:linear-gradient(135deg,var(--primary),var(--gold));
  -webkit-background-clip:text; -webkit-text-fill-color:transparent;
  background-clip:text; position:relative; z-index:1;
}
.stat-label { font-size:.9rem; opacity:.62; margin-top:8px; font-weight:500; position:relative; z-index:1; }

/* ===== 内容墙 ===== */
.content-wall {
  display:grid; grid-template-columns:repeat(auto-fill,minmax(280px,1fr)); gap:28px;
}
.content-wall-item {
  position:relative; border-radius:var(--rad-lg); overflow:hidden;
  background:var(--card); border:1px solid rgba(30,30,30,.05);
  box-shadow:var(--shadow-sm); transition:transform .45s var(--ease-bounce),box-shadow .4s ease;
}
.content-wall-item::after {
  content:'🎬 弹幕 1.2万'; position:absolute; top:14px; right:14px;
  background:rgba(30,30,30,.55); backdrop-filter:blur(10px);
  color:#fff; padding:4px 12px; border-radius:100px;
  font-size:.72rem; font-weight:600; letter-spacing:.3px;
  border:1px solid rgba(255,255,255,.15);
  transition:background .3s ease;
}
.content-wall-item:hover { transform:translateY(-6px); box-shadow:var(--shadow-md); }
.content-wall-item:hover::after { background:var(--primary); }
.content-wall-item img {
  width:100%; height:200px; object-fit:cover; display:block;
  transition:transform .6s cubic-bezier(.23,1,.32,1);
}
.content-wall-item:hover img { transform:scale(1.07); }
.content-wall-body { padding:20px 22px 24px; }
.content-wall-body h3 { font-size:1.05rem; font-weight:800; margin-bottom:6px; letter-spacing:-.3px; }
.content-wall-body p { font-size:.88rem; opacity:.62; line-height:1.5; }

/* ===== FAQ ===== */
.faq-list { max-width:800px; margin:0 auto; }
.faq-item {
  border:1px solid rgba(30,30,30,.07); border-radius:var(--rad-md);
  background:var(--card); margin-bottom:12px; overflow:hidden;
  cursor:pointer; transition:border-color .3s ease,box-shadow .3s ease;
}
.faq-item.open { border-color:var(--primary); box-shadow:0 8px 28px rgba(255,75,62,.1); }
.faq-item .faq-question {
  padding:20px 24px; font-weight:700; display:flex;
  justify-content:space-between; align-items:center;
  font-size:1rem; letter-spacing:.2px; transition:color .3s ease;
}
.faq-item.open .faq-question { color:var(--primary); }
.faq-item .faq-question::after {
  content:'+'; font-size:1.4rem; font-weight:400; color:var(--ink-soft);
  transition:transform .4s var(--ease-bounce),color .3s ease;
  line-height:1;
}
.faq-item.open .faq-question::after {
  transform:rotate(45deg); color:var(--primary);
}
.faq-item .faq-answer {
  padding:0 24px 20px; display:none; opacity:.7;
  font-size:.95rem; line-height:1.7; color:var(--ink-soft);
}
.faq-item.open .faq-answer { display:block; opacity:.7; }

/* ===== CTA横幅 ===== */
.cta-banner {
  padding:80px 24px; text-align:center; border-radius:var(--rad-xl);
  background:linear-gradient(135deg,var(--primary),#ff7a6a 50%,var(--gold));
  position:relative; overflow:hidden;
  box-shadow:var(--shadow-lg);
}
.cta-banner::before {
  content:''; position:absolute; top:-40%; right:-20%;
  width:300px; height:300px; border-radius:50%;
  background:rgba(255,255,255,.08); pointer-events:none;
}
.cta-banner::after {
  content:''; position:absolute; bottom:-60%; left:10%;
  width:260px; height:260px; border-radius:50%;
  background:rgba(255,255,255,.06); pointer-events:none;
}
.cta-banner h2 {
  color:#fff!important; font-size:clamp(1.8rem,4vw,2.6rem);
  font-weight:900; letter-spacing:-1px; position:relative; z-index:1;
}
.cta-banner p { color:rgba(255,255,255,.8); max-width:460px; margin:16px auto 32px; position:relative; z-index:1; }
.cta-banner .btn-primary {
  background:#fff; color:var(--primary); box-shadow:0 10px 30px rgba(0,0,0,.12);
  position:relative; z-index:1;
}
.cta-banner .btn-primary:hover { transform:translateY(-3px) scale(1.02); box-shadow:0 16px 40px rgba(0,0,0,.18); }

/* ===== 页脚 ===== */
.site-footer {
  padding:72px 0 32px;
  background:linear-gradient(180deg,var(--paper),#FFF4EF);
  border-top:1px solid rgba(30,30,30,.04);
}
.footer-grid { display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:40px; }
.footer-brand .logo { margin-bottom:16px; }
.footer-brand p { font-size:.9rem; opacity:.62; line-height:1.7; max-width:280px; }
.footer-col h4 { font-size:.9rem; font-weight:800; margin-bottom:18px; letter-spacing:1px; text-transform:uppercase; color:var(--ink); }
.footer-col a {
  display:block; text-decoration:none; font-size:.9rem; opacity:.6;
  padding:5px 0; transition:color .25s ease,opacity .25s ease;
  color:var(--ink);
}
.footer-col a:hover { color:var(--primary); opacity:1; }
.footer-bottom {
  border-top:1px solid rgba(30,30,30,.07); margin-top:48px; padding-top:24px;
  text-align:center; font-size:.82rem; opacity:.55;
  display:flex; align-items:center; justify-content:center; gap:6px;
}
.footer-bottom::before { content:'©'; font-weight:700; }

/* ===== 关键帧 ===== */
@keyframes danmakuMove {
  from { transform:translateX(100vw); }
  to { transform:translateX(-100%); }
}
@keyframes logoFloat {
  0%,100% { transform:translateY(0) rotate(0deg); }
  50% { transform:translateY(-4px) rotate(-3deg); }
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .feature-block { gap:40px; }
  .hero { padding-top:120px; }
  .hero-content { max-width:600px; }
}

@media (max-width: 768px) {
  .feature-block { grid-template-columns:1fr; gap:48px; }
  .stats-bar { grid-template-columns:repeat(2,1fr); }
  .footer-grid { grid-template-columns:1fr 1fr; gap:32px; }
  .main-nav { display:none; }
  .menu-toggle { display:block; }
  .main-nav.open {
    display:flex; flex-direction:column; position:fixed; top:72px; left:0;
    width:100%; background:rgba(255,252,248,.98);
    backdrop-filter:blur(20px);
    padding:24px; gap:8px; border-bottom:1px solid rgba(30,30,30,.08);
    box-shadow:0 24px 60px rgba(30,30,30,.12);
    z-index:999;
  }
  .main-nav.open a { padding:14px 8px; font-size:1rem; border-radius:8px; }
  .main-nav.open a:hover { background:var(--primary-muted); }
  .main-nav.open .nav-cta { text-align:center; margin-top:8px; }
  .hero { min-height:auto; padding-top:110px; padding-bottom:60px; }
  .hero h1 { font-size:2.4rem; letter-spacing:-1.5px; }
  .hero p { font-size:1rem; }
  .hero-image { margin-top:40px; }
  .section { padding:72px 0; }
}

@media (max-width: 480px) {
  .cards-grid,.content-wall,.stats-bar { grid-template-columns:1fr; }
  .footer-grid { grid-template-columns:1fr; gap:24px; }
  .hero-buttons { flex-direction:column; }
  .hero-buttons .btn { width:100%; justify-content:center; }
  .hero h1 { font-size:2rem; }
  .hero h1::after { font-size:.3em; }
  .stat-number { font-size:2rem; }
  .section-title { font-size:1.6rem; }
  .cta-banner { padding:56px 20px; }
  .cta-banner h2 { font-size:1.6rem; }
  .btn { width:100%; justify-content:center; }
}