/* 今日Todo 官网 · ChunUI 设计语言（与 App 同一套 token） */
:root {
  --coral: #f77272;
  --coral-ink: #c94a4a;      /* 珊瑚色文字：在浅底上满足 4.5:1 */
  --coral-light: #fff0f0;
  --canvas: #f5f6f8;
  --card: #ffffff;
  --card-2: #f2f2f7;
  --ink: #1a1a1e;
  --ink-2: #5c5c66;          /* 次级文字：比 App 时间刻度色更深，保证可读 */
  --line: #e8e9ed;
  --radius-card: 32px;
  --radius-group: 16px;
  --radius-chip: 9px;
  --shadow: 0 10px 30px rgba(0, 0, 0, .05);
}
@media (prefers-color-scheme: dark) {
  :root {
    --coral-ink: #ff9a9a;
    --coral-light: #3a2a2c;
    --canvas: #1a1718;
    --card: #262022;
    --card-2: #342c2f;
    --ink: #f2f2f7;
    --ink-2: #b4b4bc;
    --line: #332729;
    --shadow: 0 10px 30px rgba(0, 0, 0, .3);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
a { color: var(--coral-ink); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }

.wrap { max-width: 1040px; margin: 0 auto; padding: 0 20px; }

/* 顶栏 */
.nav { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--canvas) 86%, transparent); backdrop-filter: saturate(160%) blur(16px); -webkit-backdrop-filter: saturate(160%) blur(16px); border-bottom: 1px solid var(--line); }
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 700; font-size: 17px; }
.brand:hover { text-decoration: none; }
.brand img { width: 30px; height: 30px; border-radius: 8px; }
.nav-links { display: flex; gap: 22px; font-size: 15px; }
.nav-links a { color: var(--ink-2); }

/* 首屏 */
.hero { padding-top: 72px; padding-bottom: 40px; display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; align-items: center; }
.eyebrow { display: inline-block; font-size: 13px; font-weight: 600; color: var(--coral-ink); background: var(--coral-light); padding: 4px 12px; border-radius: 999px; }
h1 { font-size: clamp(36px, 6vw, 56px); line-height: 1.12; letter-spacing: -.02em; margin: 18px 0 16px; }
.lead { font-size: 19px; color: var(--ink-2); max-width: 30em; margin: 0 0 28px; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.btn { display: inline-flex; align-items: center; gap: 8px; height: 50px; padding: 0 24px; border-radius: 14px; font-weight: 600; font-size: 16px; }
.btn-primary { background: var(--ink); color: var(--canvas); }
.btn-primary:hover { text-decoration: none; opacity: .9; }
.btn-ghost { background: var(--card); color: var(--ink); border: 1px solid var(--line); }
.btn-ghost:hover { text-decoration: none; }
.note { font-size: 13px; color: var(--ink-2); }

.phone { justify-self: center; width: min(300px, 80vw); border-radius: 44px; padding: 10px; background: var(--card); box-shadow: var(--shadow); border: 1px solid var(--line); }
.phone img { border-radius: 36px; }

/* 功能区 */
section { padding: 56px 0; }
h2 { font-size: clamp(26px, 4vw, 34px); line-height: 1.25; margin: 0 0 12px; letter-spacing: -.01em; }
.section-lead { color: var(--ink-2); margin: 0 0 32px; max-width: 36em; }

.feature { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; padding: 40px; background: var(--card); border-radius: var(--radius-card); box-shadow: var(--shadow); margin-bottom: 24px; }
.feature.reverse .feature-text { order: 2; }
.feature h3 { font-size: 24px; margin: 0 0 12px; line-height: 1.3; }
.feature p { color: var(--ink-2); margin: 0 0 14px; }
.feature ul { margin: 0; padding-left: 1.2em; color: var(--ink-2); }
.feature li { margin: 6px 0; }
.feature .shot { justify-self: center; width: min(280px, 72vw); border-radius: 34px; overflow: hidden; border: 1px solid var(--line); }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.tile { background: var(--card); border-radius: var(--radius-group); padding: 22px; border: 1px solid var(--line); }
.tile h4 { margin: 0 0 6px; font-size: 17px; }
.tile p { margin: 0; color: var(--ink-2); font-size: 15px; }
.tile .icon { width: 36px; height: 36px; border-radius: var(--radius-chip); background: var(--coral-light); color: var(--coral-ink); display: grid; place-items: center; font-weight: 700; margin-bottom: 12px; }

.pricing { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.plan { background: var(--card); border-radius: var(--radius-card); padding: 28px; border: 1px solid var(--line); }
.plan h3 { margin: 0 0 6px; }
.plan .price { font-size: 15px; color: var(--ink-2); margin-bottom: 14px; }
.plan ul { margin: 0; padding-left: 1.2em; color: var(--ink-2); }
.plan.pro { border: 2px solid var(--coral); }

/* 文档页（隐私 / 协议 / 支持） */
.doc { max-width: 760px; margin: 0 auto; padding: 48px 20px 72px; }
.doc h1 { font-size: clamp(30px, 5vw, 40px); margin-bottom: 8px; }
.doc .meta { color: var(--ink-2); font-size: 14px; margin-bottom: 32px; }
.doc h2 { font-size: 21px; margin: 36px 0 10px; }
.doc p, .doc li { color: var(--ink); }
.doc ul { padding-left: 1.3em; }
.doc li { margin: 6px 0; }
.doc .card { background: var(--card); border-radius: var(--radius-group); padding: 20px 22px; border: 1px solid var(--line); margin: 16px 0; }
.doc table { width: 100%; border-collapse: collapse; font-size: 15px; margin: 12px 0; }
.doc th, .doc td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.doc th { color: var(--ink-2); font-weight: 600; }
details { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-group); padding: 14px 18px; margin: 10px 0; }
summary { cursor: pointer; font-weight: 600; }
details p { color: var(--ink-2); margin: 10px 0 2px; }

/* 页脚 */
footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--ink-2); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 12px 24px; justify-content: space-between; }
footer nav { display: flex; flex-wrap: wrap; gap: 18px; }
footer a { color: var(--ink-2); }

@media (max-width: 760px) {
  body { font-size: 16px; }
  .nav-links { gap: 14px; font-size: 14px; }
  .nav-links .hide-sm { display: none; }
  .hero { grid-template-columns: 1fr; padding-top: 40px; }
  .feature, .feature.reverse { grid-template-columns: 1fr; padding: 24px; gap: 24px; }
  .feature.reverse .feature-text { order: 0; }
  .grid, .pricing { grid-template-columns: 1fr; }
}