/* 深海圈 AI 工具台 · 根域名首页（静态，无脚本、无外部资源）。令牌和样式取自工具站新版演示，浅色和深色跟随系统。 */

:root {
  color-scheme: light;
  --c-brand: #0b6e63;
  --c-brand-hover: #095b52;
  --c-brand-ink: #074a42;
  --c-brand-soft: #e6f2ef;
  --c-brand-softer: #f2f8f6;
  --c-on-brand: #ffffff;
  --c-bg: #f4f5f4;
  --c-surface: #ffffff;
  --c-surface-2: #f8f9f8;
  --c-line: #e3e6e4;
  --c-line-strong: #cfd5d2;
  --c-text: #131917;
  --c-text-2: #3f4a45;
  --c-text-3: #6b7671;
  --r-sm: 8px;
  --r-md: 10px;
  --r-lg: 14px;
  --s-2: 0 1px 2px rgba(16, 24, 22, .04), 0 6px 20px rgba(16, 24, 22, .07);
  --s-3: 0 2px 6px rgba(16, 24, 22, .06), 0 18px 48px rgba(16, 24, 22, .14);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --c-brand: #2fb39f;
    --c-brand-hover: #49c4b1;
    --c-brand-ink: #8fe0d2;
    --c-brand-soft: #143430;
    --c-brand-softer: #112622;
    --c-on-brand: #04201c;
    --c-bg: #0d1110;
    --c-surface: #141917;
    --c-surface-2: #181e1c;
    --c-line: #252d2a;
    --c-line-strong: #34403b;
    --c-text: #e7ecea;
    --c-text-2: #bcc6c1;
    --c-text-3: #8c9893;
    --s-2: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .35);
    --s-3: 0 2px 8px rgba(0, 0, 0, .4), 0 20px 56px rgba(0, 0, 0, .5);
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; min-height: 100vh; display: flex; flex-direction: column; background: var(--c-surface); color: var(--c-text); font-family: var(--font); font-size: 15px; line-height: 1.6; -webkit-font-smoothing: antialiased; }
h1, h2, p, ol { margin: 0; }
a { color: inherit; text-decoration: none; }
svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; flex: none; }
:focus-visible { outline: 2px solid var(--c-brand); outline-offset: 2px; border-radius: 6px; }
main { flex: 1; }

.site-w { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* 按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; height: 34px; padding: 0 14px; border: 1px solid var(--c-line-strong); border-radius: var(--r-sm); background: var(--c-surface); color: var(--c-text); font-size: 14px; font-weight: 500; white-space: nowrap; transition: background .15s, border-color .15s; }
.btn:hover { border-color: var(--c-text-3); background: var(--c-surface-2); }
.btn.primary { background: var(--c-brand); border-color: var(--c-brand); color: var(--c-on-brand); }
.btn.primary:hover { background: var(--c-brand-hover); border-color: var(--c-brand-hover); }
.btn.sm { height: 30px; padding: 0 12px; font-size: 13px; }
.btn.lg { height: 44px; padding: 0 20px; font-size: 15px; }

/* 顶栏 */
.site-h { position: sticky; top: 0; z-index: 10; background: var(--c-surface); border-bottom: 1px solid var(--c-line); }
.site-h .site-w { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 60px; }
.site-brand { display: flex; align-items: center; gap: 8px; }
.site-brand b { font-weight: 650; font-size: 16px; }
.site-brand small { color: var(--c-text-3); font-size: 13px; }
.brand-mark { width: 30px; height: 30px; display: grid; place-items: center; border-radius: 8px; background: var(--c-brand); color: var(--c-on-brand); }
.brand-mark svg { width: 18px; height: 18px; stroke-width: 2; }

/* 首屏 */
.hero { padding: 64px 0 56px; background: var(--c-surface); background: radial-gradient(circle at 8% 0%, color-mix(in srgb, var(--c-brand) 10%, transparent), transparent 42%), var(--c-surface); }
.hero-w { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 48px; align-items: center; }
.hero h1 { font-size: 42px; line-height: 1.2; font-weight: 700; letter-spacing: -.02em; }
.hero-copy p { margin: 16px 0 26px; max-width: 560px; font-size: 17px; line-height: 1.8; color: var(--c-text-2); }
.hero-act { display: flex; flex-wrap: wrap; gap: 10px; }

.flow { list-style: none; padding: 20px; display: grid; gap: 4px; border: 1px solid var(--c-line); border-radius: var(--r-lg); background: var(--c-surface); box-shadow: var(--s-3); }
.flow li { position: relative; display: grid; grid-template-columns: 32px minmax(0, 1fr); column-gap: 12px; padding: 8px 4px; }
.flow li:not(:last-child)::after { content: ""; position: absolute; left: 19.5px; top: 44px; bottom: -8px; width: 1px; background: var(--c-line-strong); }
.flow-n { grid-row: span 2; width: 32px; height: 32px; display: grid; place-items: center; border-radius: 50%; background: var(--c-brand-soft); color: var(--c-brand-ink); font-size: 13px; font-weight: 650; }
.flow b { font-size: 15px; font-weight: 600; }
.flow li > span:last-child { font-size: 13px; color: var(--c-text-3); }

/* 区块 */
.sec { padding: 48px 0; }
.sec.alt { background: var(--c-surface-2); border-top: 1px solid var(--c-line); }
.sec h2 { font-size: 22px; font-weight: 650; margin-bottom: 18px; }
.prods { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; }
.card { border: 1px solid var(--c-line); border-radius: var(--r-lg); background: var(--c-surface); }
.prod { display: grid; gap: 8px; align-content: start; padding: 18px; }
.prod b { display: flex; align-items: center; gap: 6px; font-size: 15px; font-weight: 600; }
.prod p { font-size: 13.5px; line-height: 1.7; color: var(--c-text-3); }
.prod.link { transition: border-color .15s, box-shadow .15s; }
.prod.link:hover { border-color: var(--c-line-strong); box-shadow: var(--s-2); }
.prod .go { color: var(--c-brand); font-weight: 500; }
.ti { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 10px; background: var(--c-brand-soft); color: var(--c-brand); }
.about { max-width: 720px; color: var(--c-text-2); line-height: 1.8; }

/* 页脚 */
.site-foot { border-top: 1px solid var(--c-line); background: var(--c-surface-2); padding: 20px 0 28px; font-size: 13px; color: var(--c-text-3); }
.site-foot .site-w { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 10px; }
.site-foot a { color: var(--c-text-3); }
.site-foot a:hover { color: var(--c-text-2); text-decoration: underline; }

@media (max-width: 900px) {
  .hero-w { grid-template-columns: minmax(0, 1fr); gap: 32px; }
}
@media (max-width: 760px) {
  .site-w { padding: 0 16px; }
  .hero { padding: 36px 0 32px; }
  .hero h1 { font-size: 30px; }
  .hero-copy p { font-size: 16px; }
  .sec { padding: 36px 0; }
  .site-foot .dot { display: none; }
  .site-foot .site-w { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 400px) {
  .site-brand small { display: none; }
  .hero-act .btn { flex: 1 1 100%; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}