/* ============================================================
   F1 数据可视化 — 下载页样式
   配色与 App 主题（Z_F1_Frontend/lib/theme/app_theme.dart）保持一致：
   底色 #121212 / 描边 #2A2A2A / F1 红 #E10600
   零外部依赖：无 Web 字体、无 CDN
   ============================================================ */

:root {
  --bg: #121212;
  --bg-card: #1a1a1a;
  --bg-card-deep: #000000;
  --border: #2a2a2a;
  --text: #f5f5f5;
  --text-dim: #9e9e9e;
  --red: #e10600;
  --red-hover: #ff1a14;
  --radius: 14px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  line-height: 1.6;
}

img { display: block; max-width: 100%; }

/* ============ Hero ============ */

.hero {
  position: relative;
  overflow: hidden;
  /* 极淡方格旗纹理（纯 CSS，45° 棋盘），只在 Hero 背景 */
  background:
    linear-gradient(45deg, rgba(255, 255, 255, 0.035) 25%, transparent 25%, transparent 75%, rgba(255, 255, 255, 0.035) 75%),
    linear-gradient(45deg, rgba(255, 255, 255, 0.035) 25%, transparent 25%, transparent 75%, rgba(255, 255, 255, 0.035) 75%),
    var(--bg);
  background-size: 36px 36px, 36px 36px, auto;
  background-position: 0 0, 18px 18px, 0 0;
  border-bottom: 1px solid var(--border);
}

/* 顶部一条 F1 红的速度线 */
.hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--red), rgba(225, 6, 0, 0.15));
}

.hero-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 56px 20px 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 36px;
}

.hero-main {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  width: 100%;
}

.app-icon {
  width: 112px;
  height: 112px;
  border-radius: 22%;
  border: 1px solid var(--border);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.55);
}

.hero h1 {
  margin: 20px 0 6px;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.subtitle {
  margin: 0;
  color: var(--text-dim);
  font-size: 1.02rem;
}

.badge {
  margin-top: 14px;
  padding: 4px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-card);
  color: var(--text-dim);
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
}

/* —— 下载按钮（手机端主角）—— */
.btn-download {
  margin-top: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 420px;
  min-height: 56px;
  padding: 14px 28px;
  border-radius: var(--radius);
  background: var(--red);
  color: #fff;
  font-size: 1.12rem;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: 0.03em;
  box-shadow: 0 10px 28px rgba(225, 6, 0, 0.35);
  transition: background 0.15s ease, transform 0.15s ease;
}

.btn-download:hover { background: var(--red-hover); }
.btn-download:active { transform: translateY(1px); }

.meta {
  margin: 12px 0 0;
  color: var(--text-dim);
  font-size: 0.88rem;
  font-variant-numeric: tabular-nums;
}

/* —— 二维码卡片 —— */
.hero-qr {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.qr-card {
  /* 白底衬底：深色模块在深底上无法被扫码识别 */
  background: #fff;
  padding: 12px;
  border-radius: var(--radius);
  border-top: 3px solid var(--red);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
}

#qrcode svg {
  display: block;
  width: 160px;
  height: 160px;
}

.qr-tip {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.88rem;
  text-align: center;
}

/* 手机端用户已在页面上：桌面扫码引导隐藏 */
.qr-tip-mobile { display: block; }
.qr-tip-desktop { display: none; }

/* ============ 通用分区 ============ */

.section {
  max-width: 1080px;
  margin: 0 auto;
  padding: 48px 20px 8px;
}

.section-title {
  margin: 0 0 24px;
  font-size: 1.35rem;
  font-weight: 700;
  padding-left: 12px;
  border-left: 4px solid var(--red);
  line-height: 1.2;
}

/* ============ 功能亮点 ============ */

.feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 18px;
  transition: border-color 0.15s ease;
}

.feature-card:hover { border-color: var(--red); }

.feature-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: rgba(225, 6, 0, 0.12);
  margin-bottom: 12px;
}

.feature-icon svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: var(--red);
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.feature-card h3 {
  margin: 0 0 6px;
  font-size: 1.05rem;
  font-weight: 700;
}

.feature-card p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.92rem;
}

/* ============ 界面截图 ============ */

.shot-grid {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  padding-bottom: 12px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.shot-frame {
  margin: 0;
  flex: 0 0 210px;
  scroll-snap-align: start;
  background: var(--bg-card-deep);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 10px 8px;
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.4);
}

/* 手机壳顶部的“刘海”条 */
.shot-frame::before {
  content: "";
  display: block;
  width: 56px;
  height: 5px;
  border-radius: 999px;
  background: var(--border);
  margin: 2px auto 10px;
}

.shot-frame img {
  width: 100%;
  border-radius: 12px;
}

/* ============ 页脚 ============ */

.footer {
  max-width: 1080px;
  margin: 0 auto;
  padding: 40px 20px 48px;
  color: var(--text-dim);
  font-size: 0.85rem;
  text-align: center;
  border-top: 1px solid var(--border);
  margin-top: 40px;
}

.footer p { margin: 4px 0; }

.footer-tip { color: var(--text); }

/* ============ 桌面 / 大屏（≥768px） ============ */

@media (min-width: 768px) {
  .hero-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    gap: 48px;
    padding: 72px 20px 64px;
  }

  .hero-main {
    width: auto;
    flex: 1;
    align-items: flex-start;
    text-align: left;
  }

  .hero h1 { font-size: 2.5rem; }

  .btn-download {
    width: auto;
    min-width: 280px;
    max-width: none;
    min-height: 52px;
    font-size: 1.08rem;
  }

  /* 桌面/大屏：大二维码扫码是主角 */
  .hero-qr { flex: 0 0 auto; }

  .qr-card { padding: 16px; }

  #qrcode svg {
    width: 240px;
    height: 240px;
  }

  .qr-tip-mobile { display: none; }
  .qr-tip-desktop { display: block; font-size: 0.95rem; }

  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .shot-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    overflow: visible;
  }

  .shot-frame {
    flex: none;
    max-width: 280px;
    justify-self: center;
    width: 100%;
  }
}