/* ===========================================================================
   Smart Visual Counter — 落地页样式
   Apple 风 · 响应式 · 深色模式 · RTL 兼容（使用 logical properties）
   =========================================================================== */

:root {
  --bg: #ffffff;
  --fg: #1d1d1f;
  --muted: #6e6e73;
  --border: #d2d2d7;
  --card: #f5f5f7;
  --accent: #0071e3;
  --btn-bg: #1d1d1f;
  --btn-fg: #ffffff;
  --radius: 18px;
  --maxw: 1040px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC",
    "Hiragino Sans", "Noto Sans CJK", "Noto Sans Thai", "Noto Naskh Arabic",
    "Microsoft YaHei", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --fg: #f5f5f7;
    --muted: #98989d;
    --border: #2a2a2c;
    --card: #1c1c1e;
    --accent: #2997ff;
    --btn-bg: #f5f5f7;
    --btn-fg: #000000;
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

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

h1, h2, h3 { line-height: 1.2; letter-spacing: -0.02em; }

/* ---- skip link (a11y) ---- */
.skip-link {
  position: absolute;
  inset-inline-start: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 10px 16px;
  border-radius: 0 0 8px 8px;
  z-index: 100;
}
.skip-link:focus { inset-inline-start: 0; text-decoration: none; }

/* ---- header ---- */
.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 16px 24px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--fg);
  font-weight: 600;
  font-size: 18px;
}
.brand:hover { text-decoration: none; }
.brand-icon { border-radius: 8px; }

.langnav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  font-size: 14px;
}
.langnav a { color: var(--muted); }
.langnav a.active { color: var(--fg); font-weight: 600; }

/* ---- hero ---- */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 48px 24px 64px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: 40px;
}
.badge {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  padding: 5px 12px;
  border-radius: 999px;
  margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(34px, 6vw, 56px);
  font-weight: 700;
  margin-bottom: 18px;
}
.lede {
  font-size: clamp(17px, 2.5vw, 20px);
  color: var(--muted);
  margin-bottom: 28px;
  max-width: 30em;
}
.hero-cta { display: flex; flex-direction: column; align-items: flex-start; gap: 10px; }
.cta-note { font-size: 13px; color: var(--muted); }

/* ---- hero visual (占位，后续可换真实截图) ---- */
.hero-visual { display: flex; justify-content: center; }
.phone {
  width: 240px;
  aspect-ratio: 3 / 5;
  border-radius: 36px;
  background: linear-gradient(160deg, #3a86ff 0%, #5e60ce 60%, #7048e8 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  box-shadow: 0 24px 60px rgba(80, 70, 200, 0.35);
}
.phone img { border-radius: 26px; box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25); }
.phone-tag { color: #fff; font-weight: 600; font-size: 15px; opacity: 0.95; }

/* ---- buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-weight: 600;
  padding: 12px 22px;
  border-radius: 980px;
  transition: opacity 0.15s, transform 0.15s;
}
.btn:hover { text-decoration: none; opacity: 0.85; }
.btn:active { transform: scale(0.98); }
.btn-lg { font-size: 17px; padding: 14px 28px; }
.store-btn .apple { flex: 0 0 auto; }

/* ---- generic section ---- */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 56px 24px;
}
.section h2 {
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
}
.section-intro {
  text-align: center;
  color: var(--muted);
  max-width: 40em;
  margin: 0 auto 36px;
}

/* ---- features ---- */
.feature-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 36px;
}
.feature {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
}
.feature-icon { font-size: 32px; display: block; margin-bottom: 14px; }
.feature h3 { font-size: 19px; margin-bottom: 8px; }
.feature p { color: var(--muted); font-size: 15px; }

/* ---- steps ---- */
.step-list {
  list-style: none;
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.step { display: flex; align-items: flex-start; gap: 18px; }
.step-num {
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}
.step h3 { font-size: 18px; margin-bottom: 4px; }
.step p { color: var(--muted); font-size: 15px; }

/* ---- scenes chips ---- */
.chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}
.chips li {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 10px 20px;
  font-size: 15px;
}

/* ---- faq ---- */
.faq-list { max-width: 720px; margin: 0 auto; }
.faq-item {
  border-bottom: 1px solid var(--border);
  padding: 18px 0;
}
.faq-item summary {
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  color: var(--muted);
  font-weight: 400;
  font-size: 22px;
}
.faq-item[open] summary::after { content: "–"; }
.faq-item p { color: var(--muted); margin-top: 12px; }

/* ---- final cta ---- */
.final-cta { text-align: center; }
.final-cta .btn { margin-top: 8px; }

/* ---- footer ---- */
.site-footer {
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 40px 24px 56px;
  color: var(--muted);
  font-size: 14px;
}
.foot-tagline { margin-bottom: 16px; color: var(--fg); }
.foot-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 22px;
  margin-bottom: 16px;
}
.foot-links a { color: var(--muted); }

/* ---- responsive ---- */
@media (max-width: 760px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    padding-top: 32px;
  }
  .hero-text { order: 2; }
  .hero-visual { order: 1; }
  .lede { margin-inline: auto; }
  .hero-cta { align-items: center; }
  .phone { width: 180px; }
}