/* =====================================================
   🎬 油管YouTube · 独特视频流设计系统
   视觉语言：播放器 + 奶油暖调 + 珊瑚红渐变
   ===================================================== */

/* ---------- 基础重置 ---------- */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x:hidden;
  background:#FFF9F2;
  color:#2D2D2D;
  line-height:1.5;
}

::selection { background:#FF4D5E; color:#fff; }

::-webkit-scrollbar { width:8px; }
::-webkit-scrollbar-track { background:#FFF9F2; }
::-webkit-scrollbar-thumb { background:linear-gradient(180deg,#FF4D5E,#FFB03A); border-radius:8px; }

/* ---------- 核心布局 ---------- */
.container { max-width:1200px; margin:0 auto; padding:0 24px; }

.section { padding:80px 0; }
.section:nth-child(even) { background:#FFF1E6; }

/* ---------- 导航固定 ---------- */
.site-header {
  position:fixed;
  top:0; left:0;
  width:100%;
  z-index:1000;
  background:rgba(255,248,242,0.94);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid #FFE0D6;
}
.site-header::after {
  content:'';
  position:absolute;
  bottom:-2px;
  left:0;
  width:100%;
  height:3px;
  background:linear-gradient(90deg,#FF4D5E 0%,#FFB03A 50%,#1A73E8 100%);
  border-radius:4px 4px 0 0;
}

.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:900;
  font-size:1.3rem;
  text-decoration:none;
  color:#2D2D2D;
  letter-spacing:-0.5px;
  transition:0.2s;
}
.logo:hover { transform:scale(1.02); }

.logo-icon {
  width:40px;
  height:40px;
  border-radius:12px;
  background:linear-gradient(135deg,#FF4D5E,#FF6E5E);
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:1rem;
  color:#fff;
  box-shadow:0 4px 14px rgba(255,77,94,0.4), inset 0 -2px 4px rgba(0,0,0,0.08);
}

.main-nav {
  display:flex;
  align-items:center;
  gap:28px;
  list-style:none;
}
.main-nav li { position:relative; }
.main-nav a {
  text-decoration:none;
  font-size:0.9rem;
  font-weight:600;
  color:#4A4A4A;
  transition:0.25s;
  padding:6px 2px;
  position:relative;
}
.main-nav a::before {
  content:'';
  position:absolute;
  bottom:0; left:0;
  width:100%; height:2px;
  background:linear-gradient(90deg,#FF4D5E,#FFB03A);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform 0.3s ease;
  border-radius:2px;
}
.main-nav a:hover { color:#FF4D5E; }
.main-nav a:hover::before { transform:scaleX(1); }

.nav-cta {
  padding:10px 26px !important;
  border-radius:50px;
  color:#fff !important;
  font-weight:700;
  background:linear-gradient(135deg,#FF4D5E,#FF6E5E);
  box-shadow:0 4px 16px rgba(255,77,94,0.45);
  transition:0.3s !important;
}
.nav-cta::before { display:none; }
.nav-cta:hover {
  transform:translateY(-2px);
  box-shadow:0 8px 24px rgba(255,77,94,0.55);
  color:#fff !important;
}

.menu-toggle {
  display:none;
  width:44px;
  height:44px;
  border-radius:12px;
  background:#FFE8E0;
  border:none;
  cursor:pointer;
  align-items:center;
  justify-content:center;
  font-size:1.4rem;
  color:#FF4D5E;
  transition:0.2s;
}
.menu-toggle:hover { background:#FFD7D0; }

/* ---------- 首页Hero ---------- */
.hero {
  min-height:84vh;
  display:flex;
  align-items:center;
  position:relative;
  overflow:hidden;
  background:#FFF9F2;
}
.hero::before {
  content:'▶';
  font-size:36rem;
  line-height:1;
  position:absolute;
  right:-8%;
  top:52%;
  transform:translateY(-50%) rotate(16deg);
  color:rgba(255,77,94,0.04);
  z-index:0;
  pointer-events:none;
}
.hero::after {
  content:'';
  position:absolute;
  bottom:24px;
  left:50%;
  transform:translateX(-50%);
  width:180px;
  height:4px;
  background:linear-gradient(90deg,#FF4D5E,#FFB03A,#1A73E8);
  border-radius:4px;
  opacity:0.3;
  z-index:0;
}

.hero .container {
  display:grid;
  grid-template-columns:1.1fr 0.9fr;
  gap:60px;
  align-items:center;
  position:relative;
  z-index:1;
}

.hero-content { max-width:680px; }

.hero-eyebrow {
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:0.85rem;
  font-weight:800;
  padding:7px 18px;
  border-radius:50px;
  background:linear-gradient(135deg,#FFE8E0,#FFD7D0);
  color:#E03545;
  margin-bottom:20px;
  letter-spacing:0.5px;
  box-shadow:inset 0 1px 2px rgba(255,255,255,0.6);
}
.hero-eyebrow::before { content:'▶'; font-size:0.65rem; color:#FF4D5E; }

.hero h1 {
  font-size:3.2rem;
  line-height:1.12;
  margin-bottom:22px;
  font-weight:900;
  letter-spacing:-2px;
}
.hero h1 .highlight {
  color:#FF4D5E;
  position:relative;
  display:inline-block;
}
.hero h1 .highlight::after {
  content:'';
  position:absolute;
  bottom:3px;
  left:0;
  width:100%;
  height:10px;
  background:rgba(255,183,77,0.35);
  z-index:-1;
  border-radius:6px;
}

.hero p {
  font-size:1.15rem;
  color:#6A5F5C;
  max-width:520px;
  margin-bottom:38px;
  line-height:1.7;
}

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

.hero-image {
  position:relative;
  background:linear-gradient(145deg,#FF4D5E,#FF7A5C,#FFB03A);
  min-height:420px;
  border-radius:28px;
  overflow:hidden;
  box-shadow:0 24px 60px rgba(255,77,94,0.28);
  animation:heroFloat 6s ease-in-out infinite;
}
.hero-image::after {
  content:'▶';
  position:absolute;
  top:50%; left:50%;
  transform:translate(-50%,-50%);
  width:84px;
  height:84px;
  background:rgba(255,255,255,0.94);
  border-radius:50%;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:1.5rem;
  color:#FF4D5E;
  box-shadow:0 8px 30px rgba(0,0,0,0.2);
  z-index:2;
  transition:0.3s;
}
.hero-image:hover::after { transform:translate(-50%,-50%) scale(1.08); }
.hero-image img { width:100%; height:420px; object-fit:cover; display:block; }
.hero-image:has(img)::after { display:none; }

@keyframes heroFloat {
  0%, 100% { transform:translateY(0); }
  50% { transform:translateY(-14px); }
}

/* ---------- 按钮 ---------- */
.btn {
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:14px 30px;
  border-radius:50px;
  font-weight:700;
  font-size:0.95rem;
  cursor:pointer;
  border:none;
  text-decoration:none;
  transition:all 0.3s cubic-bezier(0.4,0,0.2,1);
}

.btn-primary {
  background:linear-gradient(135deg,#FF4D5E,#FF6E5E);
  color:#fff;
  box-shadow:0 6px 20px rgba(255,77,94,0.4);
}
.btn-primary:hover {
  transform:translateY(-3px);
  box-shadow:0 12px 32px rgba(255,77,94,0.5);
}

.btn-outline {
  background:transparent;
  border:2px solid #2D2D2D;
  color:#2D2D2D;
}
.btn-outline:hover {
  border-color:#FF4D5E;
  color:#FF4D5E;
  transform:translateY(-3px);
  box-shadow:0 8px 24px rgba(255,77,94,0.1);
}

/* ---------- 标签/标题 ---------- */
.section-label {
  display:inline-block;
  font-size:0.78rem;
  font-weight:900;
  letter-spacing:3px;
  margin-bottom:14px;
  color:#FF4D5E;
  text-transform:uppercase;
  position:relative;
  padding-left:30px;
}
.section-label::before {
  content:'//';
  position:absolute;
  left:0;
  font-weight:900;
  color:#FF4D5E;
  letter-spacing:-2px;
}

.section-title {
  font-size:2.2rem;
  margin-bottom:14px;
  font-weight:900;
  letter-spacing:-1px;
  position:relative;
  padding-bottom:14px;
}
.section-title::after {
  content:'';
  position:absolute;
  bottom:0; left:0;
  width:56px;
  height:4px;
  background:linear-gradient(90deg,#FF4D5E,#FFB03A);
  border-radius:4px;
}

.section-desc {
  max-width:600px;
  color:#8A7A72;
  margin-bottom:44px;
  line-height:1.7;
  font-size:1rem;
}

/* ---------- 卡片网格 ---------- */
.cards-grid {
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(260px,1fr));
  gap:24px;
}

.category-card {
  background:#fff;
  border-radius:22px;
  padding:32px 28px;
  border:none;
  box-shadow:0 4px 24px rgba(120,80,50,0.06);
  transition:all 0.35s cubic-bezier(0.4,0,0.2,1);
  position:relative;
  overflow:hidden;
}
.category-card::before {
  content:'▶';
  position:absolute;
  right:-18px;
  bottom:-18px;
  font-size:4.2rem;
  color:rgba(255,77,94,0.07);
  transform:rotate(18deg);
  transition:0.4s;
  line-height:1;
}
.category-card::after {
  content:'';
  position:absolute;
  top:18px; right:18px;
  width:8px; height:8px;
  background:#FF4D5E;
  border-radius:50%;
  opacity:0;
  transition:0.3s;
}
.category-card:hover {
  transform:translateY(-6px);
  box-shadow:0 16px 40px rgba(255,77,94,0.14);
}
.category-card:hover::before {
  color:rgba(255,77,94,0.16);
  transform:rotate(0deg) scale(1.15);
}
.category-card:hover::after { opacity:1; animation:pulse 1.2s ease infinite; }

@keyframes pulse {
  0%, 100% { transform:scale(1); opacity:1; }
  50% { transform:scale(1.5); opacity:0.6; }
}

.card-icon {
  width:54px;
  height:54px;
  border-radius:16px;
  display:flex;
  align-items:center;
  justify-content:center;
  margin-bottom:20px;
  font-size:1.4rem;
  background:linear-gradient(135deg,#FFE8E0,#FFD7D0);
  color:#FF4D5E;
  box-shadow:inset 0 2px 4px rgba(255,255,255,0.7);
}

.card-link {
  font-weight:800;
  font-size:0.85rem;
  color:#FF4D5E;
  text-decoration:none;
  display:inline-flex;
  align-items:center;
  gap:6px;
  margin-top:12px;
  transition:0.3s;
}
.card-link::after { content:'→'; transition:0.3s; }
.card-link:hover::after { transform:translateX(5px); }

/* ---------- 特性块 ---------- */
.feature-block {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:60px;
  align-items:center;
}

.feature-image {
  position:relative;
  background:linear-gradient(145deg,#1A73E8,#5EB2F2);
  min-height:360px;
  border-radius:26px;
  overflow:hidden;
  box-shadow:0 20px 50px rgba(26,115,232,0.22);
}
.feature-image::before {
  content:'';
  position:absolute;
  inset:0;
  background-image:radial-gradient(rgba(255,255,255,0.28) 1px, transparent 1px);
  background-size:24px 24px;
  z-index:1;
  pointer-events:none;
}
.feature-image::after {
  content:'';
  position:absolute;
  top:18px; right:18px;
  width:60px; height:60px;
  border:3px solid rgba(255,255,255,0.3);
  border-radius:16px;
  z-index:1;
}
.feature-image img { width:100%; height:360px; object-fit:cover; display:block; position:relative; z-index:2; }
.feature-image:has(img)::before,
.feature-image:has(img)::after { display:none; }

.feature-text h2 {
  font-size:1.8rem;
  font-weight:900;
  letter-spacing:-0.5px;
  margin-bottom:16px;
}
.feature-text h3 {
  font-size:1.1rem;
  font-weight:700;
  margin-bottom:8px;
  color:#3A3A3A;
}
.feature-text p {
  line-height:1.7;
  color:#8A7A72;
  margin-bottom:16px;
}

.feature-list { list-style:none; margin-top:20px; }
.feature-list li {
  padding:8px 0;
  display:flex;
  align-items:center;
  gap:12px;
  font-weight:500;
  color:#4A4A4A;
  font-size:0.98rem;
}
.feature-list li::before {
  content:'✓';
  font-weight:900;
  width:26px;
  height:26px;
  background:linear-gradient(135deg,#FFE8E0,#FFD7D0);
  color:#FF4D5E;
  border-radius:50%;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  font-size:0.78rem;
  flex-shrink:0;
}

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

.stat-item {
  background:#fff;
  padding:36px 20px 28px;
  border-radius:22px;
  border:none;
  box-shadow:0 4px 24px rgba(120,80,50,0.06);
  position:relative;
  overflow:hidden;
  transition:0.3s;
}
.stat-item::before {
  content:'';
  position:absolute;
  top:0; left:0;
  width:100%;
  height:4px;
  background:linear-gradient(90deg,#FF4D5E,#FFB03A);
  opacity:0;
  transition:0.3s;
}
.stat-item:hover { transform:translateY(-4px); box-shadow:0 12px 36px rgba(255,77,94,0.14); }
.stat-item:hover::before { opacity:1; }

.stat-number {
  font-size:2.6rem;
  font-weight:900;
  color:#FF4D5E;
  letter-spacing:-1px;
  line-height:1.1;
}

.stat-label {
  font-size:0.9rem;
  color:#90827C;
  margin-top:8px;
  font-weight:500;
}

/* ---------- 内容墙 ---------- */
.content-wall {
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(280px,1fr));
  gap:24px;
}

.content-wall-item {
  background:#fff;
  border-radius:22px;
  overflow:hidden;
  border:none;
  box-shadow:0 4px 24px rgba(120,80,50,0.06);
  transition:0.35s cubic-bezier(0.4,0,0.2,1);
  position:relative;
}
.content-wall-item::before {
  content:'';
  display:block;
  height:200px;
  background:linear-gradient(135deg,#FF4D5E,#FF7A5C,#FFB03A);
  transition:0.4s;
}
.content-wall-item:has(img)::before { display:none; }
.content-wall-item:hover {
  transform:translateY(-6px);
  box-shadow:0 16px 40px rgba(0,0,0,0.1);
}
.content-wall-item img {
  width:100%; height:200px;
  object-fit:cover;
  display:block;
}

.content-wall-body { padding:24px 24px 22px; }
.content-wall-body h3 {
  font-size:1.05rem;
  font-weight:800;
  margin-bottom:8px;
  line-height:1.4;
}
.content-wall-body p {
  font-size:0.88rem;
  color:#999;
  line-height:1.6;
}

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

.faq-item {
  background:#fff;
  border:none;
  border-radius:18px;
  margin-bottom:12px;
  overflow:hidden;
  cursor:pointer;
  box-shadow:0 2px 14px rgba(120,80,50,0.05);
  transition:0.3s;
  border-left:5px solid #FF4D5E;
}
.faq-item:hover { box-shadow:0 6px 28px rgba(255,77,94,0.1); }

.faq-item .faq-question {
  padding:22px 26px;
  font-weight:700;
  font-size:1rem;
  display:flex;
  justify-content:space-between;
  align-items:center;
  color:#2D2D2D;
  transition:0.2s;
}
.faq-item .faq-question::after {
  content:'+';
  font-size:1.5rem;
  font-weight:400;
  color:#FF4D5E;
  transition:0.35s ease;
  line-height:1;
  margin-left:16px;
}
.faq-item.open .faq-question::after { content:'−'; transform:rotate(180deg); }

.faq-item .faq-answer {
  padding:0 26px 22px 26px;
  display:none;
  color:#8A7A72;
  line-height:1.75;
  font-size:0.95rem;
}
.faq-item.open .faq-answer { display:block; animation:faqIn 0.35s ease; }

@keyframes faqIn {
  from { opacity:0; transform:translateY(-6px); }
  to { opacity:1; transform:translateY(0); }
}

/* ---------- CTA横幅 ---------- */
.cta-banner {
  padding:68px 24px;
  text-align:center;
  border-radius:28px;
  background:linear-gradient(135deg,#FF4D5E 0%,#FF6E5E 45%,#FFB03A 100%);
  color:#fff;
  position:relative;
  overflow:hidden;
  box-shadow:0 24px 60px rgba(255,77,94,0.35);
}
.cta-banner::before {
  content:'▶';
  position:absolute;
  left:-30px;
  bottom:-40px;
  font-size:11rem;
  opacity:0.1;
  color:#fff;
  transform:rotate(20deg);
  line-height:1;
}
.cta-banner::after {
  content:'▶';
  position:absolute;
  right:60px;
  top:-10px;
  font-size:5rem;
  opacity:0.08;
  color:#fff;
  transform:rotate(200deg);
  line-height:1;
}
.cta-banner h2 {
  color:#fff;
  font-size:2.2rem;
  font-weight:900;
  margin-bottom:12px;
  position:relative;
  z-index:1;
  letter-spacing:-0.5px;
}
.cta-banner p {
  color:rgba(255,255,255,0.92);
  max-width:520px;
  margin:0 auto 28px;
  font-size:1.05rem;
  line-height:1.7;
  position:relative;
  z-index:1;
}
.cta-banner .btn-primary {
  background:#fff;
  color:#FF4D5E !important;
  box-shadow:0 8px 30px rgba(255,255,255,0.35);
  position:relative;
  z-index:1;
}
.cta-banner .btn-primary:hover {
  transform:translateY(-3px) scale(1.02);
  box-shadow:0 14px 36px rgba(255,255,255,0.4);
}

/* ---------- 页脚 ---------- */
.site-footer {
  background:#FFF1E6;
  padding:64px 0 28px;
  color:#4A3A32;
  border-top:2px solid #FFE0D6;
}

.footer-grid {
  display:grid;
  grid-template-columns:2fr 1fr 1fr 1fr;
  gap:48px;
}

.footer-brand .logo {
  font-size:1.2rem;
  margin-bottom:16px;
}
.footer-brand p {
  color:#B08A70;
  line-height:1.7;
  font-size:0.92rem;
  max-width:240px;
  margin-top:12px;
}

.footer-col h4 {
  font-size:0.9rem;
  font-weight:900;
  margin-bottom:18px;
  letter-spacing:1px;
  color:#4A3A32;
  text-transform:uppercase;
  position:relative;
  padding-bottom:10px;
}
.footer-col h4::after {
  content:'';
  position:absolute;
  bottom:0; left:0;
  width:24px;
  height:3px;
  background:linear-gradient(90deg,#FF4D5E,#FFB03A);
  border-radius:3px;
}
.footer-col ul { list-style:none; }
.footer-col li { margin-bottom:12px; }
.footer-col a {
  text-decoration:none;
  color:#A0786A;
  font-size:0.9rem;
  transition:0.3s;
  position:relative;
}
.footer-col a:hover {
  color:#FF4D5E;
  padding-left:6px;
}

.footer-bottom {
  border-top:1px solid rgba(255,77,94,0.18);
  margin-top:48px;
  padding-top:22px;
  text-align:center;
  font-size:0.85rem;
  color:#B08A70;
}

/* ---------- 工具类 ---------- */
.text-accent { color:#FF4D5E; }
.text-center { text-align:center; }

.text-center .section-title::after {
  left:50%;
  transform:translateX(-50%);
}

.seo-description {
  max-width:600px;
  margin:0 auto 48px;
  color:#90827C;
  line-height:1.8;
  text-align:center;
  font-size:0.98rem;
}

.mt-0 { margin-top:0; }
.mb-0 { margin-bottom:0; }

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
  .feature-block { grid-template-columns:1fr; gap:40px; }
  .stats-bar { grid-template-columns:repeat(2,1fr); gap:16px; }
  .footer-grid { grid-template-columns:1fr 1fr; gap:32px; }
  .main-nav { display:none; }
  .menu-toggle { display:flex; }
  .main-nav.open {
    display:flex;
    flex-direction:column;
    position:absolute;
    top:72px;
    left:0;
    width:100%;
    background:#FFF9F2;
    padding:24px 28px;
    gap:18px;
    box-shadow:0 16px 40px rgba(0,0,0,0.1);
    border-top:1px solid #FFE0D6;
  }
  .main-nav.open li { width:100%; }
  .main-nav.open a { font-size:1.05rem; padding:8px 0; display:block; }
  .main-nav.open .nav-cta { text-align:center; padding:12px !important; }

  .hero { min-height:auto; padding:120px 0 60px; }
  .hero .container { grid-template-columns:1fr; gap:40px; }
  .hero h1 { font-size:2.5rem; }
  .hero::before { font-size:20rem; opacity:0.03; }

  .hero-image { min-height:340px; }
  .hero-image img { height:340px; }

  .section { padding:60px 0; }
}

@media (max-width: 480px) {
  .cards-grid { grid-template-columns:1fr; }
  .content-wall { grid-template-columns:1fr; }
  .stats-bar { grid-template-columns:1fr; gap:14px; }
  .footer-grid { grid-template-columns:1fr; gap:32px; }
  .hero-buttons { flex-direction:column; }
  .hero-buttons .btn { width:100%; justify-content:center; }
  .hero h1 { font-size:2.1rem; letter-spacing:-1px; }
  .hero p { font-size:1rem; }
  .hero-image { min-height:280px; border-radius:22px; }
  .hero-image img { height:280px; }

  .section-title { font-size:1.7rem; }
  .section { padding:50px 0; }

  .cta-banner { padding:48px 20px; border-radius:22px; }
  .cta-banner h2 { font-size:1.6rem; }
  .cta-banner p { font-size:0.95rem; }

  .footer-bottom { font-size:0.8rem; }
}