/* TapToAgent — 每日免费 AI API 精选 */
:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --surface-2: #f3f4f6;
  --text: #111827;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #5b5bd6;
  --accent-soft: #eef0fe;
  --accent-text: #4343c4;
  --warn-bg: #fffbeb;
  --warn-border: #fcd34d;
  --warn-text: #92400e;
  --ok-bg: #ecfdf5;
  --ok-border: #6ee7b7;
  --ok-text: #065f46;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 4px 14px rgba(0,0,0,.05);
  --maxw: 1080px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0d12;
    --surface: #14171f;
    --surface-2: #1b1f2a;
    --text: #e8eaf0;
    --muted: #9aa1b2;
    --border: #262c3a;
    --accent: #8b8bf5;
    --accent-soft: #1d1f38;
    --accent-text: #b3b3f7;
    --warn-bg: #2a2210;
    --warn-border: #92690e;
    --warn-text: #f5d78e;
    --ok-bg: #0d241c;
    --ok-border: #0e6b4a;
    --ok-text: #7ce3b5;
    --shadow: 0 1px 3px rgba(0,0,0,.4), 0 4px 14px rgba(0,0,0,.35);
  }
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-text); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- header ---- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: var(--maxw); margin: 0 auto; padding: .8rem 1.25rem;
  display: flex; align-items: center; gap: 1rem; flex-wrap: wrap;
}
.brand { font-weight: 800; font-size: 1.15rem; color: var(--text); letter-spacing: .2px; }
.brand span { color: var(--accent); }
nav.main-nav { display: flex; gap: .25rem; flex-wrap: wrap; margin-left: auto; }
nav.main-nav a {
  color: var(--muted); font-size: .92rem; padding: .45rem .8rem; border-radius: 8px;
}
nav.main-nav a:hover { background: var(--surface-2); color: var(--text); text-decoration: none; }
nav.main-nav a.active { background: var(--accent-soft); color: var(--accent-text); font-weight: 600; }

/* ---- layout ---- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 2rem 1.25rem 4rem; }
.hero {
  text-align: center; padding: 3.5rem 1rem 2.5rem;
  background: radial-gradient(60% 90% at 50% 0%, var(--accent-soft), transparent 70%);
  border-radius: var(--radius);
}
.hero h1 { font-size: clamp(1.8rem, 4.5vw, 2.8rem); line-height: 1.3; letter-spacing: .5px; }
.hero p.sub { color: var(--muted); margin-top: .8rem; font-size: 1.05rem; }
.badge {
  display: inline-block; font-size: .8rem; color: var(--accent-text);
  background: var(--accent-soft); border: 1px solid var(--border);
  padding: .25rem .8rem; border-radius: 999px; margin-bottom: 1rem;
}
h1.page-title { font-size: clamp(1.6rem, 4vw, 2.2rem); margin-bottom: .4rem; }
.lead { color: var(--muted); font-size: 1.05rem; margin-bottom: 2rem; max-width: 720px; }
h2.section { font-size: 1.35rem; margin: 2.8rem 0 1.2rem; padding-bottom: .4rem; border-bottom: 2px solid var(--accent-soft); }
h3 { font-size: 1.1rem; margin: 1.4rem 0 .5rem; }

/* ---- cards ---- */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.1rem; }
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.4rem; box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .18s ease;
  display: flex; flex-direction: column; gap: .6rem;
}
.card:hover { transform: translateY(-3px); }
.card h3 { margin: 0; font-size: 1.08rem; }
.card .tag {
  align-self: flex-start; font-size: .75rem; font-weight: 600;
  background: var(--accent-soft); color: var(--accent-text);
  padding: .15rem .6rem; border-radius: 999px;
}
.card dl { font-size: .93rem; }
.card dt { color: var(--muted); font-size: .82rem; margin-top: .55rem; }
.card dd { margin: 0; }
.card .go { margin-top: auto; padding-top: .6rem; font-weight: 600; }
.pick { border: 2px solid var(--accent); position: relative; }
.pick::before {
  content: "今日精选"; position: absolute; top: -13px; left: 1.1rem;
  background: var(--accent); color: #fff; font-size: .75rem; font-weight: 700;
  padding: .15rem .7rem; border-radius: 999px;
}

/* ---- callouts ---- */
.note, .warn {
  border-radius: var(--radius); padding: 1rem 1.25rem; margin: 1.2rem 0; font-size: .95rem;
}
.note { background: var(--ok-bg); border: 1px solid var(--ok-border); color: var(--ok-text); }
.warn { background: var(--warn-bg); border: 1px solid var(--warn-border); color: var(--warn-text); }
.verify {
  margin-top: 3rem; padding-top: 1rem; border-top: 1px dashed var(--border);
  color: var(--muted); font-size: .85rem;
}

/* ---- lists ---- */
ul.check { list-style: none; padding: 0; }
ul.check li { padding: .45rem 0 .45rem 1.7rem; position: relative; }
ul.check li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 700; }
ol.steps { padding-left: 1.4rem; }
ol.steps li { margin: .5rem 0; }
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: var(--surface-2); padding: .15rem .45rem; border-radius: 6px; font-size: .88em;
}

/* ---- footer ---- */
.site-footer { border-top: 1px solid var(--border); margin-top: 2rem; }
.footer-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 2rem 1.25rem;
  color: var(--muted); font-size: .88rem; display: flex; gap: 1.5rem; flex-wrap: wrap;
  justify-content: space-between;
}
.footer-inner .friends a { margin-right: 1rem; }

@media (max-width: 640px) {
  .header-inner { padding: .7rem .9rem; }
  nav.main-nav a { padding: .4rem .55rem; font-size: .85rem; }
  .wrap { padding: 1.4rem .9rem 3rem; }
  .hero { padding: 2.2rem .8rem 1.8rem; }
}