/* AiYaDianzi Tech — site design system (v2, rebuild 2026-10-31) */
:root {
  --bg: #f7f8fa;
  --card: #ffffff;
  --ink: #1c2330;
  --ink-2: #4a5568;
  --ink-3: #8a94a6;
  --brand: #2456f0;
  --brand-dark: #1a3fb8;
  --brand-soft: #e8eeff;
  --accent: #0ea56e;
  --line: #e4e8ef;
  --radius: 14px;
  --maxw: 1080px;
  --shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 8px 24px rgba(16, 24, 40, .05);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg); color: var(--ink);
  font-size: 16px; line-height: 1.75;
}
a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-dark); }
img { max-width: 100%; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* header */
.site-head { background: var(--card); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 50; }
.site-head .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 18px; color: var(--ink); }
.logo-mark { width: 30px; height: 30px; border-radius: 8px; background: linear-gradient(135deg, var(--brand), #6d8dff); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 14px; font-weight: 800; }
.nav { display: flex; align-items: center; gap: 4px; }
.nav a { padding: 8px 12px; border-radius: 8px; color: var(--ink-2); font-size: 15px; }
.nav a:hover { background: var(--brand-soft); color: var(--brand-dark); }
.nav a.on { color: var(--brand); font-weight: 600; }
.lang-switch { border: 1px solid var(--line); border-radius: 8px; padding: 4px 10px; font-size: 13px; color: var(--ink-2); }
.menu-btn { display: none; border: 1px solid var(--line); background: var(--card); border-radius: 8px; padding: 6px 12px; font-size: 16px; cursor: pointer; }

/* hero */
.hero { padding: 56px 0 40px; background: linear-gradient(180deg, #eef3ff 0%, var(--bg) 100%); }
.hero h1 { font-size: 34px; line-height: 1.3; letter-spacing: -0.5px; }
.hero p.lead { margin-top: 14px; font-size: 17px; color: var(--ink-2); max-width: 720px; }
.hero .stats { display: flex; gap: 28px; margin-top: 26px; flex-wrap: wrap; }
.hero .stats b { font-size: 24px; color: var(--brand); }

/* sections */
.section { padding: 40px 0 8px; }
.section > h2 { font-size: 24px; margin-bottom: 6px; }
.section > .sub { color: var(--ink-3); font-size: 15px; margin-bottom: 20px; }

/* cards grid */
.grid { display: grid; gap: 16px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.card h3 { font-size: 17px; margin-bottom: 8px; }
.card p { color: var(--ink-2); font-size: 14.5px; }
.card .go { display: inline-block; margin-top: 12px; font-weight: 600; font-size: 14px; }
.ico { width: 42px; height: 42px; border-radius: 10px; background: var(--brand-soft); display: flex; align-items: center; justify-content: center; font-size: 21px; margin-bottom: 12px; }

/* tool page */
.tool-box { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; margin: 22px 0; }
.tool-box textarea, .tool-box input[type="text"], .tool-box input[type="number"], .tool-box select {
  width: 100%; border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; font-size: 15px; font-family: inherit; background: #fbfcfe; color: var(--ink);
}
.tool-box textarea { min-height: 180px; resize: vertical; }
.btn { display: inline-block; border: none; cursor: pointer; background: var(--brand); color: #fff; font-size: 15px; font-weight: 600; border-radius: 10px; padding: 11px 22px; }
.btn:hover { background: var(--brand-dark); }
.btn.ghost { background: #fff; color: var(--ink-2); border: 1px solid var(--line); }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 14px; }
.stat-row { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 16px; }
.stat-chip { background: var(--brand-soft); color: var(--brand-dark); border-radius: 10px; padding: 10px 16px; font-size: 14px; }
.stat-chip b { font-size: 18px; display: block; }
.out { background: #f2f4f8; border: 1px solid var(--line); border-radius: 10px; padding: 14px; font-family: ui-monospace, SFMono-Regular, Consolas, "Courier New", monospace; font-size: 14px; white-space: pre-wrap; word-break: break-all; max-height: 340px; overflow: auto; margin-top: 14px; }
.ok-msg { color: var(--accent); font-weight: 600; }
.err-msg { color: #d33; font-weight: 600; }

/* article */
.prose { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 34px 38px; margin: 22px 0; }
.prose h2 { font-size: 21px; margin: 30px 0 12px; padding-left: 12px; border-left: 4px solid var(--brand); }
.prose h3 { font-size: 17.5px; margin: 22px 0 10px; }
.prose p { margin: 12px 0; color: #2a3444; }
.prose ul, .prose ol { margin: 12px 0 12px 26px; }
.prose li { margin: 7px 0; }
.prose code { background: #eef1f6; border-radius: 5px; padding: 2px 7px; font-size: 13.5px; font-family: ui-monospace, Consolas, monospace; }
.prose pre { background: #14181f; color: #dce3ee; border-radius: 10px; padding: 16px 18px; overflow: auto; margin: 14px 0; font-size: 13.5px; line-height: 1.6; }
.prose pre code { background: none; color: inherit; padding: 0; }
.prose blockquote { border-left: 4px solid var(--line); padding: 6px 16px; color: var(--ink-3); margin: 14px 0; background: #fafbfc; }
.meta-line { color: var(--ink-3); font-size: 13.5px; margin-top: 4px; }
.crumb { font-size: 13.5px; color: var(--ink-3); margin-top: 18px; }
.tag { display: inline-block; background: var(--brand-soft); color: var(--brand-dark); border-radius: 6px; padding: 2px 10px; font-size: 12.5px; margin-right: 6px; }

/* list page */
.list-item { display: block; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px; margin-bottom: 14px; box-shadow: var(--shadow); }
.list-item h3 { font-size: 17px; margin-bottom: 6px; }
.list-item p { color: var(--ink-2); font-size: 14.5px; }
.list-item .meta-line { margin-top: 8px; }

/* footer */
.site-foot { border-top: 1px solid var(--line); background: var(--card); margin-top: 56px; padding: 30px 0 34px; color: var(--ink-3); font-size: 13.5px; }
.site-foot .wrap { display: flex; justify-content: space-between; gap: 18px; flex-wrap: wrap; }
.site-foot a { color: var(--ink-2); margin-right: 14px; }

@media (max-width: 860px) {
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .hero h1 { font-size: 26px; }
  .prose { padding: 24px 20px; }
  .menu-btn { display: block; }
  .nav { display: none; position: absolute; top: 60px; left: 0; right: 0; background: var(--card); border-bottom: 1px solid var(--line); flex-direction: column; padding: 10px 16px 16px; align-items: stretch; }
  .nav.open { display: flex; }
}