/* ============ 糖心vlog · 观鸟主题 · 主色 #ef4444 · 深色背景 ============ */
:root {
  --bg: #0b0d12;
  --bg-soft: #11141b;
  --card: #171b24;
  --line: rgba(255, 255, 255, .08);
  --text: #eef1f7;
  --muted: #99a3b4;
  --primary: #ef4444;
  --primary-deep: #b91c1c;
  --primary-soft: rgba(239, 68, 68, .14);
  --radius: 18px;
  --shadow: 0 10px 30px rgba(0, 0, 0, .35);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font-family: inherit; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.hidden { display: none !important; }

/* ---------- 顶部导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(11, 13, 18, .86);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; gap: 18px; height: 64px; }
.logo { display: flex; align-items: center; gap: 8px; font-size: 20px; font-weight: 800; white-space: nowrap; }
.logo-emoji { font-size: 26px; }
.nav-links { display: flex; gap: 4px; flex: 1; justify-content: center; }
.nav-links a {
  padding: 8px 12px; border-radius: 10px; color: var(--muted);
  font-size: 14px; transition: .2s; white-space: nowrap;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); background: var(--primary-soft); }
.nav-auth { display: flex; gap: 10px; }
.btn {
  padding: 8px 18px; border-radius: 999px; border: 1px solid var(--line);
  background: transparent; color: var(--text); cursor: pointer; font-size: 14px; transition: .2s;
}
.btn:hover { border-color: var(--primary); color: #fff; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: #dc2626; }
.btn-ghost { background: rgba(255, 255, 255, .12); border-color: rgba(255, 255, 255, .35); color: #fff; }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, #450a0a 0%, #ef4444 52%, #7f1d1d 100%);
}
.hero::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 72% 18%, rgba(255, 255, 255, .16), transparent 55%);
}
.hero-inner {
  position: relative; z-index: 2; max-width: 900px; margin: 0 auto;
  padding: 96px 20px 80px; text-align: center;
}
.hero h1 { font-size: 44px; font-weight: 900; letter-spacing: 1px; text-shadow: 0 4px 18px rgba(0, 0, 0, .25); }
.hero-sub { margin: 18px auto 0; max-width: 660px; color: rgba(255, 255, 255, .92); font-size: 16px; }
.search-box {
  display: flex; max-width: 560px; margin: 34px auto 0;
  background: #fff; border-radius: 999px; padding: 6px;
  box-shadow: 0 14px 34px rgba(0, 0, 0, .28);
}
.search-box input {
  flex: 1; border: none; outline: none; background: transparent;
  padding: 0 20px; font-size: 15px; color: #1a1d24; min-width: 0;
}
.search-box button {
  border: none; background: var(--primary); color: #fff;
  border-radius: 999px; padding: 12px 26px; font-size: 15px; cursor: pointer; transition: .2s;
}
.search-box button:hover { background: #dc2626; }
.hero-stats { display: flex; justify-content: center; gap: 56px; margin-top: 44px; color: #fff; }
.hero-stat b { display: block; font-size: 30px; font-weight: 900; }
.hero-stat span { font-size: 13px; opacity: .85; }
.particle {
  position: absolute; bottom: -12px; border-radius: 50%;
  background: rgba(255, 255, 255, .75); pointer-events: none;
  animation: floatUp linear infinite;
}
@keyframes floatUp {
  0% { transform: translateY(0); opacity: 0; }
  10% { opacity: .8; }
  90% { opacity: .4; }
  100% { transform: translateY(-680px); opacity: 0; }
}

/* ---------- 区块通用 ---------- */
.section { padding: 72px 0; }
.section-head { margin-bottom: 34px; }
.sec-tag {
  display: inline-block; padding: 5px 14px; border-radius: 999px;
  background: var(--primary-soft); color: var(--primary); font-size: 13px; font-weight: 700;
}
.section-head h2 { font-size: 30px; font-weight: 900; margin-top: 10px; }
.section-head p { color: var(--muted); margin-top: 6px; font-size: 15px; max-width: 640px; }

/* ---------- 视频卡片 ---------- */
.video-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
@media (max-width: 960px) { .video-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; } }
.video-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; transition: transform .25s, box-shadow .25s, border-color .25s;
}
.video-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: rgba(239, 68, 68, .45); }
.video-cover { position: relative; display: block; aspect-ratio: 16 / 9; overflow: hidden; background: #20242e; }
.video-cover img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.video-card:hover .video-cover img { transform: scale(1.06); }
.play-btn {
  position: absolute; inset: 0; margin: auto; width: 52px; height: 52px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(239, 68, 68, .92); color: #fff; border-radius: 50%;
  font-size: 20px; box-shadow: 0 8px 20px rgba(0, 0, 0, .4); transition: .25s;
}
.video-card:hover .play-btn { transform: scale(1.12); }
.dur {
  position: absolute; right: 10px; bottom: 10px; background: rgba(0, 0, 0, .72);
  padding: 2px 8px; border-radius: 6px; font-size: 12px; color: #fff;
}
.video-body { padding: 14px 16px 16px; }
.video-title {
  font-size: 15px; font-weight: 700; line-height: 1.45;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.video-desc {
  color: var(--muted); font-size: 13px; margin-top: 6px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.video-creator { display: flex; align-items: center; gap: 10px; margin-top: 12px; }
.video-creator .avatar { width: 34px; height: 34px; border-radius: 50%; border: 2px solid var(--primary); object-fit: cover; }
.creator-info { display: flex; flex-direction: column; line-height: 1.35; }
.creator-name { font-size: 13px; font-weight: 700; }
.creator-meta { font-size: 12px; color: var(--muted); }

/* ---------- 创作者 ---------- */
.creator-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 18px; }
@media (max-width: 960px) { .creator-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 560px) { .creator-grid { grid-template-columns: repeat(2, 1fr); } }
.creator-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 14px; text-align: center; transition: .25s;
}
.creator-card:hover { transform: translateY(-5px); border-color: rgba(239, 68, 68, .5); }
.creator-avatar {
  position: relative; width: 76px; height: 76px; margin: 0 auto; border-radius: 50%;
  padding: 3px; background: linear-gradient(135deg, var(--primary), #fca5a5);
}
.creator-avatar img { width: 100%; height: 100%; border-radius: 50%; object-fit: cover; border: 3px solid var(--card); }
.star-badge { position: absolute; right: -4px; bottom: -2px; font-size: 18px; filter: drop-shadow(0 2px 4px rgba(0, 0, 0, .4)); }
.creator-card h3 { margin-top: 12px; font-size: 16px; }
.creator-card p { color: var(--muted); font-size: 12px; margin-top: 4px; }
.creator-fans {
  display: inline-block; margin-top: 10px; padding: 4px 12px; border-radius: 999px;
  background: var(--primary-soft); color: var(--primary); font-size: 12px; font-weight: 700;
}

/* ---------- 平台特色 ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 900px) { .feature-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .feature-grid { grid-template-columns: 1fr; } }
.feature-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; transition: .25s; }
.feature-card:hover { transform: translateY(-4px); border-color: rgba(239, 68, 68, .4); }
.feature-icon {
  width: 52px; height: 52px; border-radius: 14px; background: var(--primary-soft);
  display: flex; align-items: center; justify-content: center; font-size: 26px;
}
.feature-card h3 { margin-top: 16px; font-size: 17px; }
.feature-card p { color: var(--muted); font-size: 14px; margin-top: 6px; }

/* ---------- 数据统计 ---------- */
.stats-band {
  background: linear-gradient(135deg, #1f0a0a, #2a1114 55%, #1a0e10);
  border: 1px solid var(--line); border-radius: 24px; padding: 44px 20px;
}
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; }
@media (max-width: 760px) { .stats-grid { grid-template-columns: repeat(2, 1fr); row-gap: 30px; } }
.stat-item b {
  display: block; font-size: 40px; font-weight: 900;
  background: linear-gradient(90deg, #f87171, #ef4444);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat-item span { color: var(--muted); font-size: 14px; }

/* ---------- 用户评价 ---------- */
.testi-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
@media (max-width: 760px) { .testi-grid { grid-template-columns: 1fr; } }
.testi-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.testi-head { display: flex; align-items: center; gap: 12px; }
.testi-head img { width: 46px; height: 46px; border-radius: 50%; object-fit: cover; }
.testi-head h3 { font-size: 15px; }
.testi-head span { font-size: 12px; color: var(--muted); }
.testi-stars { margin-left: auto; color: #fbbf24; font-size: 14px; letter-spacing: 2px; }
.testi-text { margin-top: 14px; color: #cfd6e1; font-size: 14px; }

/* ---------- 成功故事 ---------- */
.story-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 900px) { .story-grid { grid-template-columns: 1fr; } }
.story-card {
  background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--primary);
  border-radius: 14px; padding: 22px; transition: .25s;
}
.story-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.story-card h3 { font-size: 17px; }
.story-card p { color: var(--muted); font-size: 14px; margin-top: 10px; }

/* ---------- APP 展示 ---------- */
.app-wrap { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; }
@media (max-width: 860px) { .app-wrap { grid-template-columns: 1fr; } }
.app-left h3 { font-size: 22px; margin-bottom: 8px; }
.app-left .app-intro { color: var(--muted); font-size: 14px; }
.app-points { display: flex; flex-direction: column; gap: 18px; margin-top: 26px; }
.app-point { display: flex; gap: 14px; }
.app-point-icon {
  flex: none; width: 48px; height: 48px; border-radius: 14px; background: var(--primary-soft);
  display: flex; align-items: center; justify-content: center; font-size: 22px;
}
.app-point h4 { font-size: 16px; }
.app-point p { color: var(--muted); font-size: 13px; margin-top: 2px; }
.app-phone-wrap { display: flex; justify-content: center; }
.phone {
  position: relative; width: 270px; height: 560px; border-radius: 38px;
  border: 8px solid #232833; background: #0f1218;
  box-shadow: 0 30px 70px rgba(0, 0, 0, .5); overflow: hidden;
}
.phone::before {
  content: ""; position: absolute; top: 10px; left: 50%; transform: translateX(-50%);
  width: 110px; height: 22px; border-radius: 999px; background: #232833; z-index: 3;
}
.phone-screen { position: absolute; inset: 0; display: flex; flex-direction: column; }
.phone-screen img { flex: 1; width: 100%; object-fit: cover; }
.phone-status {
  position: absolute; top: 40px; left: 0; right: 0; display: flex; justify-content: space-between;
  padding: 0 18px; color: #fff; font-size: 12px; z-index: 2;
}
@media (max-width: 400px) { .phone { width: 240px; height: 500px; } }

/* ---------- 内页页头 ---------- */
.page-hero {
  background: linear-gradient(180deg, rgba(239, 68, 68, .14), transparent);
  padding: 64px 0 46px; text-align: center;
}
.page-hero h1 { font-size: 36px; font-weight: 900; }
.page-hero p { color: var(--muted); margin: 10px auto 0; max-width: 640px; font-size: 15px; }

/* ---------- 筛选栏 ---------- */
.filter-bar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 28px; }
.filter-btn {
  padding: 8px 18px; border-radius: 999px; border: 1px solid var(--line);
  background: var(--card); color: var(--muted); cursor: pointer; font-size: 14px; transition: .2s;
}
.filter-btn:hover { color: var(--text); border-color: rgba(239, 68, 68, .4); }
.filter-btn.active { background: var(--primary); border-color: var(--primary); color: #fff; }

/* ---------- 关于页 ---------- */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; align-items: center; }
@media (max-width: 860px) { .about-grid { grid-template-columns: 1fr; } }
.about-grid img { border-radius: var(--radius); box-shadow: var(--shadow); width: 100%; }
.about-text h3 { font-size: 22px; margin-bottom: 14px; }
.about-text p { color: #cfd6e1; margin-bottom: 12px; font-size: 15px; }
.value-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 860px) { .value-grid { grid-template-columns: 1fr; } }
.value-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.value-card h3 { margin-top: 16px; font-size: 17px; }
.value-card p { color: var(--muted); font-size: 14px; margin-top: 6px; }
.contact-list { display: flex; flex-wrap: wrap; gap: 18px; }
.contact-item { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px 24px; }
.contact-item b { display: block; color: var(--primary); font-size: 14px; margin-bottom: 4px; }
.contact-item span { color: var(--muted); font-size: 14px; }
.cta-box {
  background: linear-gradient(135deg, #450a0a, #b91c1c);
  border-radius: 24px; padding: 44px 30px; text-align: center;
}
.cta-box h2 { font-size: 26px; font-weight: 900; }
.cta-box p { color: rgba(255, 255, 255, .85); margin: 10px 0 24px; max-width: 560px; margin-left: auto; margin-right: auto; }
.cta-box .btn { margin: 0 6px; }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--line); background: var(--bg-soft); padding: 54px 0 28px; margin-top: 30px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 30px; }
@media (max-width: 820px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer-brand p { color: var(--muted); font-size: 14px; margin-top: 12px; max-width: 300px; }
.footer h4 { font-size: 15px; margin-bottom: 14px; }
.footer-links a { display: block; color: var(--muted); font-size: 14px; padding: 5px 0; transition: .2s; }
.footer-links a:hover { color: var(--primary); }
.footer-copy { border-top: 1px solid var(--line); margin-top: 36px; padding-top: 20px; text-align: center; color: var(--muted); font-size: 13px; }

/* ---------- 响应式细节 ---------- */
@media (max-width: 880px) { .nav-links { display: none; } }
@media (max-width: 640px) {
  .hero-inner { padding: 64px 20px 56px; }
  .hero h1 { font-size: 30px; }
  .hero-stats { gap: 26px; }
  .hero-stat b { font-size: 22px; }
  .section { padding: 52px 0; }
  .section-head h2 { font-size: 24px; }
}