/* Tidy Tools — 共享样式。设计令牌与产品一致：青蓝(TidyPDF)/靛蓝(TidyPic)，浅深双主题 */
:root {
  --pdf: #0d9488; --pdf-strong: #0f766e;
  --pic: #6366f1; --pic-strong: #4f46e5;
  --aivis: #d97706; --aivis-strong: #b45309;
  --doc: #2563eb; --doc-strong: #1d4ed8;
  --bg: #f5f7f8; --panel: #ffffff; --ink: #1b2427; --muted: #5f707a; --line: #dde4e7;
  --shadow: 0 1px 3px rgba(16, 42, 46, .07), 0 6px 20px rgba(16, 42, 46, .06);
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --pdf: #2dd4bf; --pdf-strong: #14b8a6;
    --pic: #818cf8; --pic-strong: #6366f1;
    --aivis: #f59e0b; --aivis-strong: #d97706;
    --doc: #60a5fa; --doc-strong: #3b82f6;
    --bg: #0f1516; --panel: #1a2123; --ink: #e7ecee; --muted: #93a4ac; --line: #2a3538;
    --shadow: 0 1px 3px rgba(0,0,0,.45);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", sans-serif;
}
main { max-width: 980px; margin: 0 auto; padding: 0 22px 90px; }
h1 { font-size: clamp(30px, 5.5vw, 44px); line-height: 1.15; letter-spacing: -.015em; margin: 0 0 14px; text-wrap: balance; }
h2 { font-size: 24px; letter-spacing: -.01em; margin: 54px 0 16px; text-wrap: balance; }
h3 { font-size: 17px; margin: 0 0 6px; }
p { margin: 0 0 14px; }
.muted { color: var(--muted); }
a { color: inherit; }

/* 顶栏 */
header.top {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  max-width: 980px; margin: 0 auto; padding: 20px 22px;
}
.wordmark { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; text-decoration: none; }
.wordmark .dot { width: 22px; height: 22px; border-radius: 7px; background: linear-gradient(135deg, var(--pdf), var(--pic)); }
nav.top-nav { display: flex; gap: 20px; font-size: 14.5px; }
nav.top-nav a { color: var(--muted); text-decoration: none; }
nav.top-nav a:hover { color: var(--ink); }

/* 首页 hero */
.hero { padding: 64px 0 30px; max-width: 640px; }
.hero .kicker {
  display: inline-block; font-size: 12.5px; font-weight: 700; letter-spacing: .09em; text-transform: uppercase;
  color: var(--pdf-strong); margin-bottom: 14px;
}
.hero p.lede { font-size: 19px; color: var(--muted); max-width: 56ch; }

/* 产品卡片 */
.products { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; margin-top: 38px; }
.product-card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 12px;
  text-decoration: none; transition: transform .15s;
}
.product-card:hover { transform: translateY(-2px); }
.product-card img.icon { width: 56px; height: 56px; border-radius: 14px; }
.product-card .name { font-size: 20px; font-weight: 700; }
.product-card .desc { color: var(--muted); font-size: 15px; flex: 1; }
.product-card .cta { font-weight: 600; font-size: 14.5px; }
.product-card.pdf .cta { color: var(--pdf-strong); }
.product-card.pic .cta { color: var(--pic-strong); }
.product-card.aivis .cta { color: var(--aivis-strong); }
.product-card.doc .cta { color: var(--doc-strong); }

/* 承诺条 */
.promise {
  margin-top: 56px; padding: 26px 30px; border-radius: var(--radius);
  background: var(--panel); border: 1px solid var(--line); box-shadow: var(--shadow);
}
.promise ul { margin: 10px 0 0; padding: 0; list-style: none; display: grid; gap: 8px; }
.promise li { padding-left: 26px; position: relative; }
.promise li::before { content: "✓"; position: absolute; left: 0; font-weight: 700; color: var(--pdf-strong); }

/* 产品页 */
.prod-hero { display: flex; align-items: center; gap: 20px; padding: 54px 0 8px; }
.prod-hero img { width: 76px; height: 76px; border-radius: 18px; box-shadow: var(--shadow); }
.prod-hero .tag { font-size: 13px; font-weight: 700; letter-spacing: .07em; text-transform: uppercase; }
.page-pdf .tag { color: var(--pdf-strong); } .page-pic .tag { color: var(--pic-strong); } .page-aivis .tag { color: var(--aivis-strong); }
.page-doc .tag { color: var(--doc-strong); }

.store-row { display: flex; flex-wrap: wrap; gap: 12px; margin: 22px 0 8px; }
.btn {
  display: inline-block; padding: 11px 22px; border-radius: 10px; font-weight: 600; font-size: 15px;
  text-decoration: none; border: 1px solid var(--line); background: var(--panel);
}
.page-pdf .btn.primary { background: var(--pdf); border-color: var(--pdf); color: #fff; }
.page-pic .btn.primary { background: var(--pic); border-color: var(--pic); color: #fff; }
.page-aivis .btn.primary { background: var(--aivis); border-color: var(--aivis); color: #fff; }
.page-doc .btn.primary { background: var(--doc); border-color: var(--doc); color: #fff; }
.btn.disabled { opacity: .55; pointer-events: none; }

.shot { margin: 34px 0; }
.shot img { width: 100%; border-radius: var(--radius); border: 1px solid var(--line); box-shadow: var(--shadow); }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 18px; margin-top: 8px; }
.feature { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; }
.feature p { color: var(--muted); font-size: 14.5px; margin: 0; }

/* 隐私政策页 */
article.legal { max-width: 680px; }
article.legal h1 { font-size: 30px; padding-top: 44px; }
article.legal h2 { font-size: 19px; margin-top: 34px; }
article.legal li { margin: 5px 0; }

footer.site {
  border-top: 1px solid var(--line); margin-top: 40px; padding: 26px 22px 40px;
}
footer.site .inner { max-width: 980px; margin: 0 auto; display: flex; flex-wrap: wrap; gap: 8px 26px; font-size: 13.5px; color: var(--muted); }
footer.site a { color: var(--muted); }