/* ============================================================
   TVMap 电视地图 — 官网样式（地图类软件蓝色科技风）
   ============================================================ */
:root {
  --brand: #2b6de8;
  --brand-dark: #1a4fc0;
  --brand-deep: #123a8f;
  --brand-light: #eaf1ff;
  --bg: #ffffff;
  --bg-soft: #f6f8fc;
  --text: #1a1d26;
  --text-dim: #5a6172;
  --border: #e4e9f2;
  --shadow: 0 10px 30px rgba(18, 58, 143, 0.08);
  --radius: 14px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-dark); }

.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* ============ 顶栏 ============ */
.topbar {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}
.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 18px; color: var(--text); }
.brand img { width: 32px; height: 32px; border-radius: 8px; }
.nav { display: flex; gap: 28px; }
.nav a { color: var(--text-dim); font-size: 15px; font-weight: 500; }
.nav a:hover { color: var(--brand); }
.nav a.active { color: var(--brand); font-weight: 700; }

/* ============ Hero ============ */
.hero {
  background:
    radial-gradient(700px 320px at 12% 0%, rgba(43, 109, 232, 0.12), transparent 60%),
    radial-gradient(600px 280px at 90% 30%, rgba(26, 79, 192, 0.08), transparent 60%),
    linear-gradient(180deg, #fbfcff 0%, var(--bg) 100%);
  padding: 64px 0 0;
  text-align: center;
}
.hero h1 {
  font-size: 52px;
  font-weight: 800;
  letter-spacing: 1px;
  margin-bottom: 16px;
}
.hero h1 em { font-style: normal; color: var(--brand); }
.hero .sub {
  font-size: 18px;
  color: var(--text-dim);
  max-width: 640px;
  margin: 0 auto 32px;
}
.hero .btn-row { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: 30px;
  font-size: 16px;
  font-weight: 700;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn-primary { background: var(--brand); color: #fff; box-shadow: 0 8px 24px rgba(43, 109, 232, 0.3); }
.btn-primary:hover { background: var(--brand-dark); color: #fff; transform: translateY(-1px); }
.btn-ghost { background: #fff; color: var(--brand); border: 1.5px solid var(--brand); }
.btn-ghost:hover { background: var(--brand-light); color: var(--brand-dark); transform: translateY(-1px); }
.btn svg { width: 18px; height: 18px; }

.hero-figure {
  margin-top: 56px;
  border-radius: 18px 18px 0 0;
  overflow: hidden;
  box-shadow: 0 -8px 40px rgba(18, 58, 143, 0.10);
}
.hero-figure img { display: block; width: 100%; height: auto; }

/* ============ 区块 ============ */
.section { padding: 72px 0; }
.section-alt { background: var(--bg-soft); }
.section-title {
  font-size: 30px;
  font-weight: 800;
  text-align: center;
  margin-bottom: 12px;
}
.section-sub { text-align: center; color: var(--text-dim); margin-bottom: 44px; }

/* 特性卡 */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.feature {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.feature:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.feature .f-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: var(--brand-light);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 14px;
  font-size: 24px;
}
.feature h3 { font-size: 17px; font-weight: 700; margin-bottom: 6px; }
.feature p { color: var(--text-dim); font-size: 14px; }

/* ============ 下载页 ============ */
.page-hero { background: var(--brand-light); padding: 56px 0 40px; text-align: center; }
.page-hero h1 { font-size: 38px; font-weight: 800; margin-bottom: 8px; }
.page-hero .crumb { color: var(--text-dim); font-size: 14px; margin-bottom: 16px; }

.download-box {
  max-width: 720px;
  margin: -34px auto 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 40px;
  text-align: center;
  position: relative;
  z-index: 2;
}
.download-box .app-icon { width: 72px; height: 72px; border-radius: 18px; margin-bottom: 16px; }
.download-box h2 { font-size: 26px; font-weight: 800; margin-bottom: 6px; }
.download-box .ver { color: var(--brand); font-weight: 700; font-size: 15px; margin-bottom: 18px; }
.download-box .dl-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--brand);
  color: #fff;
  font-size: 19px;
  font-weight: 800;
  padding: 16px 44px;
  border-radius: 34px;
  box-shadow: 0 10px 28px rgba(43, 109, 232, 0.35);
  transition: transform 0.15s ease, background 0.15s ease;
  margin-bottom: 14px;
}
.download-box .dl-btn:hover { background: var(--brand-dark); color: #fff; transform: translateY(-2px); }
.download-box .dl-btn svg { width: 22px; height: 22px; }
.download-box .file-note { color: var(--text-dim); font-size: 13px; }

/* 运行环境 */
.env-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; max-width: 860px; margin: 0 auto; }
.env-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.env-item .e-icon { font-size: 22px; }
.env-item h4 { font-size: 15px; font-weight: 700; margin-bottom: 3px; }
.env-item p { color: var(--text-dim); font-size: 13.5px; }

/* ============ 帮助页 ============ */
.help-layout { display: grid; grid-template-columns: 1fr 300px; gap: 36px; align-items: start; }
.help-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 30px;
  margin-bottom: 24px;
}
.help-card h2 { font-size: 21px; font-weight: 800; margin-bottom: 16px; display: flex; align-items: center; gap: 10px; }
.help-card h2 .h-no {
  width: 26px; height: 26px;
  background: var(--brand); color: #fff;
  border-radius: 8px;
  font-size: 14px;
  display: inline-flex; align-items: center; justify-content: center;
}
.help-card h3 { font-size: 15px; font-weight: 700; margin: 14px 0 8px; }
.help-card p, .help-card li { color: var(--text-dim); font-size: 14.5px; }
.help-card ol, .help-card ul { padding-left: 22px; }
.help-card ol li, .help-card ul li { margin-bottom: 6px; }

table.ops { width: 100%; border-collapse: collapse; margin: 8px 0 4px; }
table.ops th, table.ops td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}
table.ops th { background: var(--brand-light); color: var(--brand-dark); font-weight: 700; }
table.ops td:first-child { font-weight: 600; color: var(--text); }
table.ops code {
  background: var(--brand-light);
  color: var(--brand-dark);
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
}

.sidebar { position: sticky; top: 88px; }
.side-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  text-align: center;
  margin-bottom: 20px;
}
.side-card img { width: 100%; border-radius: 10px; margin-bottom: 12px; }
.side-card .cap { color: var(--text-dim); font-size: 13px; }
.side-tip {
  background: var(--brand-light);
  border-radius: var(--radius);
  padding: 18px;
  font-size: 13.5px;
  color: var(--brand-dark);
  line-height: 1.8;
}
.side-tip strong { display: block; margin-bottom: 6px; font-size: 14px; }

/* ============ 关于页 ============ */
.about-box {
  max-width: 640px;
  margin: 0 auto;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 44px;
  text-align: center;
}
.about-box .app-icon { width: 96px; height: 96px; border-radius: 24px; margin-bottom: 18px; }
.about-box h2 { font-size: 30px; font-weight: 800; margin-bottom: 4px; }
.about-box .ver-tag { display: inline-block; background: var(--brand-light); color: var(--brand-dark); font-weight: 700; font-size: 13px; padding: 4px 14px; border-radius: 20px; margin: 10px 0 22px; }
.about-table { width: 100%; border-collapse: collapse; text-align: left; }
.about-table td { padding: 12px 16px; border-bottom: 1px solid var(--border); font-size: 14.5px; }
.about-table td:first-child { color: var(--text-dim); width: 110px; font-weight: 600; }
.about-table tr:last-child td { border-bottom: none; }
.about-note { margin-top: 22px; font-size: 13px; color: var(--text-dim); }

/* ============ 页脚 ============ */
footer {
  background: #111827;
  color: #9aa3b2;
  padding: 40px 0;
  margin-top: 40px;
  font-size: 13.5px;
}
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }
.footer-inner .f-brand { display: flex; align-items: center; gap: 8px; color: #e5e7eb; font-weight: 700; }
.footer-inner .f-brand img { width: 22px; height: 22px; border-radius: 6px; }
.footer-inner a { color: #9aa3b2; }
.footer-inner a:hover { color: #fff; }

/* ============ 移动端 ============ */
@media (max-width: 860px) {
  .features { grid-template-columns: repeat(2, 1fr); }
  .help-layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .nav { gap: 16px; }
  .hero h1 { font-size: 36px; }
}
@media (max-width: 560px) {
  .features { grid-template-columns: 1fr; }
  .env-grid { grid-template-columns: 1fr; }
  .topbar-inner { height: 56px; }
  .brand span { font-size: 15px; }
  .nav a { font-size: 13.5px; }
}