/* ============================================================
   365Lab 硬件测试 — 共享样式
   现代扁平风（类 Win11 / 微信），浅色主题，响应式
   ============================================================ */

:root {
  --accent: var(--hue-display);
  --accent-2: #3b82f6;
  --accent-dark: #1e40af;
  --accent-soft: rgba(37, 99, 235, .07);
  --bg: #f5f7fa;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --text: #1e293b;
  --text-2: #475569;
  --text-3: #64748b;
  --ok: var(--hue-perf);
  --warn: var(--hue-input);
  --err: #dc2626;
  --ok-bg: #dcfce7; --ok-fg: #15803d;
  --warn-bg: #fef3c7; --warn-fg: #b45309;
  --err-bg: #fee2e2; --err-fg: #b91c1c;
  --notice-bg: #fffbeb; --notice-bd: #fde68a; --notice-fg: #92400e;
  --stage-bg: #0f172a;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(15, 23, 42, .06), 0 4px 14px rgba(15, 23, 42, .05);
  --shadow-lg: 0 6px 24px rgba(15, 23, 42, .12);
  --header-h: 60px;
  --max-w: 1200px;
  --mono: ui-monospace, "Cascadia Mono", Consolas, "Courier New", monospace;
  /* 品牌色板：分类色与装饰渐变的单一来源 */
  --hue-display: #2563eb; --hue-display-ink: #1d4ed8;
  --hue-input: #d97706; --hue-input-ink: #b45309;
  --hue-av: #7c3aed; --hue-av-ink: #6d28d9;
  --hue-perf: #16a34a; --hue-perf-ink: #166534;
  --hue-system: #0891b2; --hue-system-ink: #0e7490;
  --ok-bright: #22c55e; --warn-bright: #eab308; --err-bright: #ef4444;
  --ok-on-dark: #4ade80; --warn-on-dark: #fbbf24; --err-on-dark: #f87171;
  --accent-bd: #bfdbfe; --accent-tint: #dbeafe; --err-bd: #fca5a5;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
.hide { display: none !important; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

body {
  font-family: "Segoe UI", "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 15px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--accent); text-decoration: none; }
a:hover, a:focus-visible { color: var(--accent-dark); }
img, svg, video, canvas { max-width: 100%; }
button { font-family: inherit; }

/* ---------- 顶栏 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  height: var(--header-h);
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: var(--max-w); margin: 0 auto; height: 100%;
  display: flex; align-items: center; gap: 18px;
  padding: 0 20px;
}
.logo {
  display: flex; align-items: center; gap: 9px;
  font-weight: 700; font-size: 17px; color: var(--text);
  white-space: nowrap;
}
.logo:hover { text-decoration: none; }
.logo-mark {
  width: 30px; height: 30px; border-radius: 8px; flex: none;
  background: linear-gradient(135deg, var(--accent-2), var(--accent-dark));
  color: #fff; display: grid; place-items: center;
  font-size: 15px; font-weight: 800;
}
.logo-sub { font-size: 12px; color: var(--text-3); font-weight: 400; margin-left: 2px; }

.main-nav { display: flex; align-items: center; gap: 2px; margin-left: auto; }
.main-nav > a, .nav-group > button {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 8px 12px; border-radius: var(--radius-sm);
  color: var(--text-2); font-size: 14px; border: none; background: none;
  cursor: pointer; white-space: nowrap;
}
@media (max-width: 1400px) {
  .logo-sub { display: none; }
  .main-nav > a, .nav-group > button { padding: 8px 9px; font-size: 13px; gap: 3px; }
}
.main-nav > a:hover, .nav-group > button:hover { background: var(--accent-soft); color: var(--accent); text-decoration: none; }
.main-nav > a.active { color: var(--accent); font-weight: 600; }
.nav-group > button.active { color: var(--accent); font-weight: 600; background: var(--accent-soft); }

.nav-group { position: relative; }
.nav-dropdown {
  position: absolute; top: calc(100% + 6px); left: 50%; transform: translateX(-50%);
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow-lg);
  padding: 8px; min-width: 220px;
  display: none; z-index: 110;
}
.nav-group:hover .nav-dropdown, .nav-group:focus-within .nav-dropdown, .nav-group.open .nav-dropdown { display: block; }
.nav-dropdown a {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 10px; border-radius: var(--radius-sm);
  color: var(--text-2); font-size: 14px;
}
.nav-dropdown a:hover { background: var(--accent-soft); color: var(--accent); text-decoration: none; }
.nav-dropdown .dd-ico { width: 20px; text-align: center; flex: none; opacity: .8; }

.header-actions { display: flex; align-items: center; gap: 8px; margin-left: 8px; }
.lang-btn {
  border: 1px solid var(--border-strong); background: var(--surface);
  color: var(--text-2); border-radius: 999px; padding: 5px 13px;
  font-size: 13px; cursor: pointer; white-space: nowrap;
}
.lang-btn:hover { border-color: var(--accent); color: var(--accent); }

.nav-burger {
  display: none; border: none; background: none; cursor: pointer;
  width: 40px; height: 40px; border-radius: var(--radius-sm);
  place-items: center;
}
.nav-burger:hover { background: var(--accent-soft); }
.nav-burger svg { width: 22px; height: 22px; stroke: var(--text-2); }

/* 移动端抽屉 */
.mobile-drawer {
  display: none; position: fixed; inset: var(--header-h) 0 0 0; z-index: 99;
  background: var(--surface); overflow-y: auto; padding: 16px 20px 40px;
}
body.drawer-open .mobile-drawer { display: block; }
body.drawer-open { overflow: hidden; }
.mobile-drawer .m-cat { font-size: 13px; font-weight: 700; color: var(--text-3); margin: 18px 0 6px; text-transform: uppercase; letter-spacing: .5px; display: flex; align-items: center; gap: 8px; }
.mobile-drawer .m-cat > span:first-child {
  width: 24px; height: 24px; border-radius: 7px; flex: none;
  display: inline-grid; place-items: center; font-size: 13px; text-transform: none;
  background: color-mix(in srgb, var(--cat, var(--accent)) 13%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--cat, var(--accent)) 28%, transparent);
}
.mobile-drawer a {
  display: flex; align-items: center; gap: 10px; padding: 11px 8px;
  color: var(--text-2); font-size: 15px; border-bottom: 1px solid var(--surface-2);
}
.mobile-drawer a.active { color: var(--accent); font-weight: 600; }

/* ---------- 主体 ---------- */
main { flex: 1; width: 100%; }
.workbench, #guide { scroll-margin-top: calc(var(--header-h) + 14px); }
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 20px; }
.container-narrow { max-width: 860px; margin: 0 auto; padding: 0 20px; }

/* ---------- 首页 Hero：精密仪器面板 ---------- */
.hero {
  padding: 66px 20px 46px; text-align: center; position: relative; overflow: hidden;
  background:
    radial-gradient(72% 96% at 50% -12%, rgba(59, 130, 246, .15), transparent 62%),
    repeating-linear-gradient(0deg, transparent 0 39px, rgba(37, 99, 235, .055) 39px 40px),
    repeating-linear-gradient(90deg, transparent 0 39px, rgba(37, 99, 235, .055) 39px 40px);
}
.hero::before {
  content: ""; position: absolute; inset: -120px -20% auto; height: 340px;
  background: radial-gradient(60% 100% at 50% 0%, rgba(59, 130, 246, .13), transparent 70%);
  pointer-events: none;
}
.hero::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-2) 20%, var(--hue-av) 50%, var(--accent-2) 80%, transparent);
  opacity: .5;
}
.hero h1 { font-size: clamp(30px, 5.2vw, 50px); font-weight: 900; letter-spacing: -1.2px; position: relative; text-wrap: balance; }
@supports (background-clip: text) or (-webkit-background-clip: text) {
  .hero h1 .hl {
    background: linear-gradient(115deg, var(--hue-display-ink) 15%, var(--hue-av) 55%, var(--hue-system) 90%);
    -webkit-background-clip: text; background-clip: text; color: transparent;
  }
  html[data-theme="dark"] .hero h1 .hl {
    background: linear-gradient(115deg, #60a5fa 15%, #a78bfa 55%, #22d3ee 90%);
    -webkit-background-clip: text; background-clip: text;
  }
  @media (prefers-color-scheme: dark) {
    html:not([data-theme="light"]):not([data-theme="dark"]) .hero h1 .hl {
      background: linear-gradient(115deg, #60a5fa 15%, #a78bfa 55%, #22d3ee 90%);
      -webkit-background-clip: text; background-clip: text;
    }
  }
}
.hero p.lead { max-width: 680px; margin: 16px auto 0; color: var(--text-2); font-size: clamp(14px, 2vw, 16.5px); position: relative; }
.hero-stats {
  display: inline-flex; justify-content: center; gap: clamp(18px, 5vw, 54px);
  margin-top: 30px; position: relative; flex-wrap: wrap;
  background: var(--surface); border: 1px solid var(--border); border-radius: 999px;
  padding: 14px clamp(20px, 5vw, 44px); box-shadow: var(--shadow);
}
.hero-stats .st b { display: block; font-size: 26px; color: var(--accent); font-weight: 900; font-variant-numeric: tabular-nums; }
.hero-stats .st span { font-size: 12px; color: var(--text-3); letter-spacing: .5px; }

/* 首页不对称构图 + 仪器表盘 */
.hero-home { padding: 60px 20px 54px; }
.hero-home h1 { font-size: clamp(26px, 3.5vw, 42px); letter-spacing: -.8px; }
.hero-split { max-width: var(--max-w); margin: 0 auto; }
.hero-dial { display: none; position: relative; width: min(330px, 78%); aspect-ratio: 1; margin: 0 auto; }
@media (min-width: 900px) {
  .hero-split { display: grid; grid-template-columns: 1.3fr .7fr; align-items: center; gap: 34px; text-align: left; }
  .hero-home .hero-stats { margin-left: 0; }
  .hero-dial { display: block; }
}
.hero-dial::before {
  content: ""; position: absolute; inset: 8%; border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--accent) 14%, transparent), transparent 68%);
}
.dial-ring { position: absolute; inset: 0; border-radius: 50%; border: 1.5px solid color-mix(in srgb, var(--accent) 45%, transparent); }
.dial-ring.r2 { inset: 13%; border-style: solid; border-color: color-mix(in srgb, var(--hue-av) 35%, transparent); }
.dial-ticks {
  position: absolute; inset: 4%; border-radius: 50%;
  background: repeating-conic-gradient(color-mix(in srgb, var(--accent) 55%, transparent) 0deg 1.4deg, transparent 1.4deg 15deg);
  -webkit-mask: radial-gradient(circle, transparent 70%, #000 71%);
  mask: radial-gradient(circle, transparent 70%, #000 71%);
}
.dial-needle {
  position: absolute; left: calc(50% - 2px); bottom: 50%; width: 4px; height: 38%;
  transform-origin: 50% 100%; border-radius: 4px;
  background: linear-gradient(180deg, var(--hue-av), var(--accent));
  box-shadow: 0 0 14px color-mix(in srgb, var(--accent) 55%, transparent);
  animation: dialSweep 7s ease-in-out infinite alternate;
}
.dial-hub {
  position: absolute; left: 50%; top: 50%; width: 18px; height: 18px; transform: translate(-50%, -50%);
  border-radius: 50%; background: linear-gradient(135deg, var(--accent-2), var(--accent-dark));
  box-shadow: 0 0 0 4px var(--surface), 0 0 16px color-mix(in srgb, var(--accent) 60%, transparent);
}
@keyframes dialSweep { from { transform: rotate(-46deg); } to { transform: rotate(52deg); } }
@media (prefers-reduced-motion: reduce) { .dial-needle { animation: none; transform: rotate(18deg); } }

/* ---------- 工具卡片 ---------- */
.tool-search { max-width: 460px; margin: 6px auto 4px; position: relative; }
.tool-search input { width: 100%; border: 1px solid var(--border-strong); border-radius: 999px; background: var(--surface); color: var(--text); padding: 10px 18px; font-size: 14px; font-family: inherit; min-height: 44px; box-shadow: var(--shadow); }
.tool-search input:hover { border-color: var(--accent-2); }
.tool-search #searchCount { position: absolute; right: 16px; top: 50%; transform: translateY(-50%); font-size: 12px; color: var(--text-3); }
.cat-filter { justify-content: center; margin: 10px auto 2px; }
.cat-filter .chip { display: inline-flex; align-items: center; gap: 5px; }
.cat-filter .chip.active { background: var(--cat, var(--accent)); border-color: var(--cat, var(--accent)); }
.cat-block { margin: 34px 0 8px; }
[data-cat] { --cat: var(--accent); --cat-ink: var(--accent); }
[data-cat="display"] { --cat: var(--hue-display); --cat-ink: var(--hue-display-ink); }
[data-cat="input"]   { --cat: var(--hue-input); --cat-ink: var(--hue-input-ink); }
[data-cat="av"]      { --cat: var(--hue-av); --cat-ink: var(--hue-av-ink); }
[data-cat="perf"]    { --cat: var(--hue-perf); --cat-ink: var(--hue-perf-ink); }
[data-cat="system"]  { --cat: var(--hue-system); --cat-ink: var(--hue-system-ink); }
html[data-theme="dark"] [data-cat] { --cat-ink: color-mix(in srgb, var(--cat) 55%, #fff); }
@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]):not([data-theme="dark"]) [data-cat] { --cat-ink: color-mix(in srgb, var(--cat) 55%, #fff); }
}
.cat-title {
  display: flex; align-items: center; gap: 10px;
  font-size: 19px; font-weight: 800; margin-bottom: 4px;
}
.cat-title .cat-ico {
  width: 32px; height: 32px; border-radius: 9px; flex: none;
  display: grid; place-items: center; font-size: 16px;
  background: color-mix(in srgb, var(--cat) 14%, var(--surface)); color: var(--cat-ink);
  border: 1px solid color-mix(in srgb, var(--cat) 30%, transparent);
}
.cat-desc { color: var(--text-2); font-size: 13.5px; margin-bottom: 14px; padding-left: 42px; }

.tool-grid {
  display: grid; gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(252px, 1fr));
  margin-bottom: 8px;
}
.tool-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px;
  display: flex; gap: 12px; align-items: flex-start;
  box-shadow: var(--shadow);
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
  color: var(--text);
  position: relative; overflow: hidden;
}
.tool-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--cat), transparent 72%);
  opacity: .9;
}
.tool-card:hover {
  text-decoration: none;
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--cat) 55%, var(--border));
  box-shadow: var(--shadow-lg);
}
.tool-card .t-ico {
  width: 42px; height: 42px; border-radius: 10px; flex: none;
  display: grid; place-items: center; font-size: 20px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--cat) 10%, var(--surface)), color-mix(in srgb, var(--cat) 20%, var(--surface)));
  color: var(--cat-ink);
  border: 1px solid color-mix(in srgb, var(--cat) 22%, transparent);
}
.tool-card b { display: block; font-size: 15px; margin-bottom: 2px; }
.tool-card > span { min-width: 0; }
.tool-card p {
  font-size: 12.8px; color: var(--text-3); line-height: 1.5;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
  overflow-wrap: break-word;
}
.tool-card .t-tag { display: inline-block; margin-top: 7px; font-size: 11px; color: var(--cat-ink); background: color-mix(in srgb, var(--cat) 10%, var(--surface)); border-radius: 999px; padding: 1px 8px; }
@media (prefers-reduced-motion: no-preference) {
  .tool-grid .tool-card { animation: cardUp .45s ease backwards; }
  .tool-grid .tool-card:nth-child(2) { animation-delay: .04s; }
  .tool-grid .tool-card:nth-child(3) { animation-delay: .08s; }
  .tool-grid .tool-card:nth-child(4) { animation-delay: .12s; }
  .tool-grid .tool-card:nth-child(5) { animation-delay: .16s; }
  .tool-grid .tool-card:nth-child(n+6) { animation-delay: .2s; }
}
@keyframes cardUp { from { opacity: 0; transform: translateY(14px); } }

/* ---------- 场景区 / FAQ / 文章 ---------- */
.section { padding: 40px 0; }
.section-head { text-align: center; margin-bottom: 26px; }
.section-head h2 { font-size: clamp(20px, 3vw, 26px); font-weight: 800; display: inline-block; position: relative; }
.section-head h2::after {
  content: ""; display: block; width: 56px; height: 4px; border-radius: 999px;
  margin: 10px auto 0; background: linear-gradient(90deg, var(--accent-2), var(--hue-av));
}
.section-head p { color: var(--text-3); margin-top: 6px; font-size: 14px; }

.scene-grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.scene-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 15px 16px; color: var(--text);
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
  --sc: var(--accent);
}
.scene-grid .scene-card:nth-child(5n+1) { --sc: var(--hue-display); }
.scene-grid .scene-card:nth-child(5n+2) { --sc: var(--hue-input); }
.scene-grid .scene-card:nth-child(5n+3) { --sc: var(--hue-av); }
.scene-grid .scene-card:nth-child(5n+4) { --sc: var(--hue-perf); }
.scene-grid .scene-card:nth-child(5n+5) { --sc: var(--hue-system); }
.scene-card b > span:first-child {
  width: 26px; height: 26px; border-radius: 8px; flex: none;
  display: inline-grid; place-items: center; font-size: 14px;
  background: color-mix(in srgb, var(--sc) 13%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--sc) 28%, transparent);
}
.scene-card:hover { border-color: var(--accent-2); text-decoration: none; transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.scene-card b { font-size: 14.5px; display: flex; gap: 7px; align-items: center; }
.scene-card p { font-size: 12.8px; color: var(--text-3); margin-top: 4px; }

.faq-list { max-width: 820px; margin: 0 auto; }
details.faq {
  background: var(--surface); border: 1px solid var(--border);
  border-left: 3px solid transparent;
  border-radius: var(--radius-sm); margin-bottom: 10px; overflow: hidden;
  transition: border-color .15s ease;
}
details.faq[open] { border-left-color: var(--accent-2); }
details.faq summary {
  cursor: pointer; padding: 14px 18px; font-weight: 600; font-size: 14.5px;
  list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 12px;
  transition: background .12s ease;
}
details.faq summary:hover { background: var(--accent-soft); }
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::after {
  content: "+"; color: var(--text-2); font-size: 14px; line-height: 1; flex: none;
  width: 24px; height: 24px; border-radius: 50%; background: var(--surface-2);
  border: 1px solid var(--border); display: grid; place-items: center;
  transition: transform .2s ease, background .15s ease;
}
details.faq[open] summary::after { content: "−"; background: var(--accent-soft); color: var(--accent); }
details.faq[open] summary::after { content: "−"; }
details.faq summary:hover { color: var(--accent); }
details.faq[open] .faq-body { animation: faqIn .22s ease; }
@keyframes faqIn { from { opacity: 0; transform: translateY(-5px); } }
details.faq .faq-body { padding: 0 18px 15px; color: var(--text-2); font-size: 13.8px; }

.article { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: clamp(18px, 4vw, 32px); position: relative; overflow: hidden; }
.article::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--accent-2), var(--hue-av) 55%, var(--hue-system));
  opacity: .85;
}
.article h2 { font-size: 20px; font-weight: 800; margin-bottom: 12px; }
.article h3 { font-size: 16px; font-weight: 700; margin: 22px 0 8px; }
.article p { color: var(--text-2); font-size: 14.2px; margin-bottom: 10px; }
.article ul, .article ol { color: var(--text-2); font-size: 14.2px; padding-left: 22px; margin-bottom: 12px; }
.article li { margin-bottom: 5px; }
.article table { width: 100%; border-collapse: collapse; font-size: 13.5px; margin: 10px 0 16px; }
.article th, .article td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.article th { background: var(--surface-2); font-weight: 700; }
.article .steps li { margin-bottom: 8px; }

/* ---------- 工具页工作台 ---------- */
.tool-hero { padding: 26px 20px 0; text-align: center; position: relative; }
.tool-hero[data-cat] { padding-top: 34px; }
.tool-hero[data-cat]::before {
  content: ""; position: absolute; inset: 0 8% auto; height: 190px; z-index: -1;
  background: radial-gradient(55% 100% at 50% 0%, color-mix(in srgb, var(--cat) 12%, transparent), transparent 70%);
  pointer-events: none;
}
.tool-hero h1 { font-size: clamp(20px, 3.4vw, 27px); font-weight: 800; }
.tool-hero[data-cat] h1 { display: inline-flex; align-items: center; gap: 13px; font-size: clamp(22px, 3.6vw, 30px); }
.tool-hero[data-cat] h1 > span:first-child {
  width: 52px; height: 52px; border-radius: 15px; font-size: 26px; flex: none;
  display: inline-grid; place-items: center;
  background: linear-gradient(135deg, color-mix(in srgb, var(--cat) 16%, var(--surface)), color-mix(in srgb, var(--cat) 32%, var(--surface)));
  border: 1px solid color-mix(in srgb, var(--cat) 35%, transparent);
  box-shadow: 0 8px 20px color-mix(in srgb, var(--cat) 22%, transparent);
}
.tool-hero[data-cat] .btn-primary { background: color-mix(in srgb, var(--cat) 78%, #000); border-color: color-mix(in srgb, var(--cat) 78%, #000); }
.tool-hero[data-cat] .btn-primary:hover { background: color-mix(in srgb, var(--cat) 62%, #000); border-color: color-mix(in srgb, var(--cat) 62%, #000); }
.tool-hero[data-cat] .crumb a:hover { color: var(--cat-ink); }
.tool-hero p { color: var(--text-2); font-size: 14px; margin-top: 5px; }
.crumb { font-size: 12.5px; color: var(--text-3); margin-bottom: 8px; }
.crumb a { color: var(--text-3); }
.crumb a:hover { color: var(--accent); }

.workbench { margin: 18px auto 30px; }
.panel {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 18px; min-width: 0; overflow: hidden;
}
.panel .panel-title {
  font-size: 13px; font-weight: 700; color: var(--text-3);
  text-transform: uppercase; letter-spacing: .6px; margin-bottom: 12px;
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
}
.panel-cols { display: grid; gap: 16px; grid-template-columns: 1.6fr 1fr; align-items: start; }
@media (max-width: 900px) { .panel-cols { grid-template-columns: 1fr; } }

/* 控件 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  border: 1px solid var(--border-strong); background: var(--surface); color: var(--text);
  border-radius: var(--radius-sm); padding: 9px 18px; font-size: 14px; cursor: pointer;
  transition: background .12s, border-color .12s, color .12s;
  min-height: 40px;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.btn-primary:hover { background: var(--accent-dark); border-color: var(--accent-dark); color: #fff; }
.btn-danger { color: var(--err-fg); border-color: var(--err-bd); }
.btn-danger:hover { border-color: var(--err); }
.btn-sm { padding: 5px 12px; font-size: 13px; min-height: 34px; }
.btn-block { width: 100%; }

.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  border: 1px solid var(--border-strong); background: var(--surface);
  color: var(--text-2); border-radius: 999px; padding: 6px 14px; font-size: 13px;
  cursor: pointer; min-height: 36px;
}
.chip:hover { border-color: var(--accent); color: var(--accent); }
.chip.active { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }

select, input[type="text"], input[type="number"] {
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  background: var(--surface); color: var(--text);
  padding: 8px 12px; font-size: 16px; font-family: inherit; min-height: 40px;
}
@media (min-width: 768px) { select, input[type="text"], input[type="number"] { font-size: 14px; } }
select:focus, input:focus, button:focus-visible, .chip:focus-visible, a:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 1px; }

label.field { display: block; font-size: 13px; color: var(--text-2); margin-bottom: 10px; }
label.field > span { display: block; margin-bottom: 4px; font-weight: 600; }
label.field select, label.field input { width: 100%; }

/* 数据展示 */
.stat-row { display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); }
.stat-box {
  background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 11px 13px; text-align: center;
}
.stat-box b { display: block; font-size: 20px; font-weight: 800; color: var(--accent); font-variant-numeric: tabular-nums; line-height: 1.2; word-break: break-all; }
.stat-box span { font-size: 11.5px; color: var(--text-3); }

.kv-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.kv-table td { padding: 7px 10px; border-bottom: 1px solid var(--surface-2); vertical-align: top; }
.kv-table td:first-child { color: var(--text-3); width: 40%; white-space: nowrap; }
.kv-table td:last-child { font-family: var(--mono); font-size: 12.5px; word-break: break-all; }
.kv-table tr:last-child td { border-bottom: none; }

.progress { height: 10px; border-radius: 999px; background: var(--surface-2); border: 1px solid var(--border); overflow: hidden; }
.progress i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--accent-2), var(--accent)); border-radius: 999px; transition: width .15s linear; }

.badge { display: inline-flex; align-items: center; gap: 5px; font-size: 12px; border-radius: 999px; padding: 2px 10px; font-weight: 600; }
.badge.ok { background: var(--ok-bg); color: var(--ok-fg); }
.badge.warn { background: var(--warn-bg); color: var(--warn-fg); }
.badge.err { background: var(--err-bg); color: var(--err-fg); }
.badge.info { background: var(--accent-soft); color: var(--accent); }

.hint { font-size: 12.5px; color: var(--text-3); margin-top: 8px; line-height: 1.55; }
.notice {
  background: var(--notice-bg); border: 1px solid var(--notice-bd); color: var(--notice-fg);
  border-radius: var(--radius-sm); padding: 10px 14px; font-size: 13px; margin-bottom: 14px;
}
.notice.blue { background: var(--accent-soft); border-color: var(--accent-bd); color: var(--accent-dark); }

/* 全屏测试层 */
.fs-overlay {
  position: fixed; inset: 0; z-index: 1000; background: #000;
  cursor: none; touch-action: none; user-select: none; -webkit-user-select: none;
}
.fs-overlay.cursor-default { cursor: default; }
.fs-hud {
  position: fixed; top: 14px; left: 50%; transform: translateX(-50%);
  background: rgba(255, 255, 255, .12); color: #fff; backdrop-filter: blur(6px);
  border-radius: 999px; padding: 7px 18px; font-size: 13px; z-index: 1001;
  display: flex; gap: 14px; align-items: center; white-space: nowrap; max-width: 94vw; overflow: hidden;
}
.fs-hud.hidden { opacity: .12; }
.fs-hud kbd { font-family: var(--mono); background: rgba(255, 255, 255, .18); border-radius: 4px; padding: 0 6px; font-size: 12px; }
.fs-hud .fs-btn { border: 1px solid rgba(255, 255, 255, .4); background: rgba(255, 255, 255, .14); color: #fff; border-radius: 999px; padding: 2px 12px; font-size: 12px; cursor: pointer; min-height: 0; }
.fs-hud .fs-btn:hover { background: rgba(255, 255, 255, .26); }

/* 键盘测试 */
.kb-wrap { display: flex; flex-direction: column; gap: 14px; }
.kb-row { display: flex; gap: 6px; justify-content: flex-start; flex-wrap: nowrap; overflow-x: auto; padding-bottom: 2px; }
.key {
  flex: 1 1 0; min-width: 34px; min-height: 40px;
  border: 1px solid var(--border-strong); border-bottom-width: 3px; border-radius: 7px;
  background: var(--surface); color: var(--text-2);
  display: grid; place-items: center; font-size: 11.5px; font-family: var(--mono);
  transition: background .08s, transform .08s;
  padding: 2px 3px; text-align: center;
}
.key.wide { flex-grow: 1.8; }
.key.wider { flex-grow: 3; }
.key.space { flex-grow: 7; }
.key.down { background: var(--accent); border-color: var(--accent-dark); color: #fff; transform: translateY(1px); }
.key.pressed-once { background: var(--accent-tint); border-color: var(--accent-2); color: var(--accent-dark); }

/* 通用测试画布区 */
.stage {
  position: relative; border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--surface-2); overflow: hidden;
}
.stage canvas { display: block; width: 100%; }

/* 电平表 */
.level-meter { height: 18px; border-radius: 999px; background: var(--surface-2); border: 1px solid var(--border); position: relative; overflow: hidden; }
.level-meter i {
  position: absolute; inset: 0 auto 0 0; width: 0;
  background: linear-gradient(90deg, var(--ok-bright) 0 60%, var(--warn-bright) 60% 85%, var(--err-bright) 85% 100%);
  transition: width .05s linear;
}

/* 结果与日志 */
.log-box {
  font-family: var(--mono); font-size: 12.3px; background: #0f172a; color: #cbd5e1;
  border-radius: var(--radius-sm); padding: 12px 14px; max-height: 260px; overflow-y: auto;
  line-height: 1.7; white-space: pre-wrap; word-break: break-all;
}
.log-box .good { color: var(--ok-on-dark); } .log-box .bad { color: var(--err-on-dark); } .log-box .dim { color: #64748b; }

/* 相关工具 / 分页 */
.related { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin: 8px 0 20px; }
.related a {
  border: 1px solid var(--border); background: var(--surface); color: var(--text-2);
  border-radius: 999px; padding: 7px 15px; font-size: 13px;
}
.related a:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.tool-pager { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 36px; }
.tool-pager .pager {
  display: flex; flex-direction: column; gap: 3px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 12px 16px; color: var(--text); box-shadow: var(--shadow);
  transition: border-color .15s ease, box-shadow .15s ease;
}
.tool-pager .pager:hover { border-color: var(--accent-2); box-shadow: var(--shadow-lg); text-decoration: none; }
.tool-pager .p-dir { font-size: 12px; color: var(--text-3); }
.tool-pager .p-name { font-size: 14.5px; font-weight: 600; }
.tool-pager .next { text-align: right; align-items: flex-end; }
@media (max-width: 560px) { .tool-pager { grid-template-columns: 1fr; } .tool-pager .next { text-align: left; align-items: flex-start; } }

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--border); background: var(--surface);
  margin-top: 40px; padding: 28px 20px; position: relative;
}
.site-footer::before {
  content: ""; position: absolute; top: -1px; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-2) 30%, var(--hue-av) 70%, transparent);
  opacity: .45;
}
.footer-inner {
  max-width: var(--max-w); margin: 0 auto;
  display: flex; flex-wrap: wrap; gap: 18px 40px; justify-content: space-between; align-items: flex-start;
}
.footer-brand { max-width: 340px; }
.footer-brand p { font-size: 12.8px; color: var(--text-3); margin-top: 8px; }
.footer-links { display: flex; gap: 44px; flex-wrap: wrap; }
.footer-col b { display: block; font-size: 12.5px; color: var(--text-3); text-transform: uppercase; letter-spacing: .5px; margin-bottom: 8px; }
.footer-col a { display: block; font-size: 13px; color: var(--text-2); padding: 3px 0; }
.footer-col a:hover { color: var(--accent); }
.footer-copy { max-width: var(--max-w); margin: 18px auto 0; padding-top: 14px; border-top: 1px solid var(--surface-2); font-size: 12.3px; color: var(--text-3); display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; }

/* ---------- 断点 ---------- */
@media (max-width: 1180px) {
  .main-nav { display: none; }
  .nav-burger { display: grid; }
}
@media (max-width: 560px) {
  body { font-size: 14.5px; }
  .hero { padding-top: 34px; }
  .tool-grid { grid-template-columns: 1fr; }
  .key { min-width: 26px; min-height: 38px; font-size: 10px; }
  .stat-box b { font-size: 17px; }
  .header-inner { padding: 0 14px; gap: 10px; }
  .logo-sub { display: none; }
  .panel { padding: 14px; }
  .fs-hud { font-size: 12px; padding: 6px 12px; gap: 8px; }
}

/* 回到顶部 */
.to-top {
  position: fixed; right: 18px; bottom: 22px; z-index: 90;
  width: 42px; height: 42px; border-radius: 50%;
  border: 1px solid var(--border-strong); background: var(--surface); color: var(--text-2);
  font-size: 18px; cursor: pointer; box-shadow: var(--shadow-lg);
  opacity: 0; pointer-events: none; transform: translateY(8px);
  transition: opacity .2s, transform .2s, border-color .15s, color .15s;
}
.to-top.show { opacity: .95; pointer-events: auto; transform: none; }
.to-top:hover { border-color: var(--accent); color: var(--accent); }
@media print { .to-top { display: none !important; } }

/* ---------- 深色主题（手动 data-theme=dark，或系统偏好且未手动锁定浅色） ---------- */
html[data-theme="dark"] {
  --bg: #0f1420;
  --surface: #1a2233;
  --surface-2: #141b29;
  --border: #2a3548;
  --border-strong: #3d4c66;
  --text: #e2e8f0;
  --text-2: #a9b6ca;
  --text-3: #8b9bb5;
  --accent: #4f8ff7;
  --accent-2: #60a5fa;
  --accent-dark: #93c5fd;
  --accent-soft: rgba(79, 143, 247, .14);
  --shadow: 0 1px 3px rgba(0, 0, 0, .4), 0 4px 14px rgba(0, 0, 0, .3);
  --shadow-lg: 0 6px 24px rgba(0, 0, 0, .5);
  --ok-bg: rgba(34, 197, 94, .16); --ok-fg: var(--ok-on-dark);
  --warn-bg: rgba(217, 119, 6, .18); --warn-fg: var(--warn-on-dark);
  --err-bg: rgba(220, 38, 38, .18); --err-fg: var(--err-on-dark);
  --notice-bg: rgba(217, 119, 6, .1); --notice-bd: rgba(217, 119, 6, .35); --notice-fg: #fcd34d;
  color-scheme: dark;
}
@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]):not([data-theme="dark"]) {
    --bg: #0f1420;
    --surface: #1a2233;
    --surface-2: #141b29;
    --border: #2a3548;
    --border-strong: #3d4c66;
    --text: #e2e8f0;
    --text-2: #a9b6ca;
    --text-3: #8b9bb5;
    --accent: #4f8ff7;
    --accent-2: #60a5fa;
    --accent-dark: #93c5fd;
    --accent-soft: rgba(79, 143, 247, .14);
    --shadow: 0 1px 3px rgba(0, 0, 0, .4), 0 4px 14px rgba(0, 0, 0, .3);
    --shadow-lg: 0 6px 24px rgba(0, 0, 0, .5);
    --ok-bg: rgba(34, 197, 94, .16); --ok-fg: var(--ok-on-dark);
    --warn-bg: rgba(217, 119, 6, .18); --warn-fg: var(--warn-on-dark);
    --err-bg: rgba(220, 38, 38, .18); --err-fg: var(--err-on-dark);
    --notice-bg: rgba(217, 119, 6, .1); --notice-bd: rgba(217, 119, 6, .35); --notice-fg: #fcd34d;
    color-scheme: dark;
  }
}
html[data-theme="dark"] .site-header,
html:not([data-theme="light"]):not([data-theme="dark"]) .site-header { background: rgba(26, 34, 51, .92); }
@media (prefers-color-scheme: light) {
  html:not([data-theme="light"]):not([data-theme="dark"]) .site-header { background: rgba(255, 255, 255, .92); }
}
html[data-theme="dark"] .btn-primary { color: #fff; }
html[data-theme="dark"] .lang-btn,
html[data-theme="dark"] .chip,
html[data-theme="dark"] .btn { background: var(--surface); }
html[data-theme="dark"] .key.pressed-once { background: rgba(96, 165, 250, .22); color: var(--accent-bd); }
@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]):not([data-theme="dark"]) .site-header { background: rgba(26, 34, 51, .92); }
  html:not([data-theme="light"]):not([data-theme="dark"]) .btn-primary { color: #fff; }
  html:not([data-theme="light"]):not([data-theme="dark"]) .key.pressed-once { background: rgba(96, 165, 250, .22); color: #bfdbfe; }
}

/* 打印：无论主题一律浅色 */
@media print {
  html, html[data-theme="dark"] {
    --bg: #fff; --surface: #fff; --surface-2: #f8fafc; --border: #e2e8f0; --border-strong: #cbd5e1;
    --text: #1e293b; --text-2: #475569; --text-3: #94a3b8;
    --ok-bg: #dcfce7; --ok-fg: #15803d; --warn-bg: #fef3c7; --warn-fg: #b45309;
    --err-bg: #fee2e2; --err-fg: #b91c1c;
    --notice-bg: #fffbeb; --notice-bd: #fde68a; --notice-fg: #92400e;
    color-scheme: light;
  }
  .site-header { background: #fff !important; }
}

/* 打印：工具页只打报告区 */
@media print {
  .site-header, .site-footer, .hero, .controls, .related, .nav-burger, .article { display: none !important; }
  body { background: #fff; }
  body a { text-decoration: underline; color: #000; }
  .panel { box-shadow: none; border-color: #999; }
}

/* ---------------- 验机清单页 ---------------- */
.ck-bar { height: 8px; border-radius: 99px; background: var(--surface-2); border: 1px solid var(--border); overflow: hidden; margin-top: 10px; }
.ck-bar i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--accent), var(--hue-system)); transition: width .35s ease; }
.ck-group { margin-top: 22px; }
.ck-group h2 { font-size: 19px; margin: 0 0 10px; display: flex; align-items: center; gap: 8px; }
.ck-group h2::before { content: ''; width: 4px; height: 18px; border-radius: 2px; background: linear-gradient(180deg, var(--accent), var(--hue-system)); }
.ck-group.done h2::after { content: '✓'; color: var(--ok-fg); font-weight: 700; }
.ck-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.ck-list label { display: flex; gap: 11px; align-items: flex-start; padding: 11px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); cursor: pointer; transition: border-color .15s, background .15s; }
.ck-list label:hover { border-color: var(--border-strong); }
.ck-list input[type="checkbox"] { margin-top: 3px; width: 16px; height: 16px; accent-color: var(--accent); flex: none; }
.ck-list label:has(input:checked) { background: color-mix(in srgb, var(--ok) 6%, var(--surface)); border-color: color-mix(in srgb, var(--ok) 35%, var(--border)); }
.ck-note { color: var(--text-2); }
@media print {
  .ck-panel, .ck-list input[type="checkbox"] { display: none; }
  .ck-list label { border-color: #999; }
  .ck-list label::before { content: '☐'; font-size: 15px; margin-right: 8px; }
}
.ck-time { font-size: 12px; font-weight: 500; color: var(--text-2); background: var(--surface-2); border: 1px solid var(--border); border-radius: 99px; padding: 2px 10px; margin-left: 4px; }
.ck-star { padding: 1px 7px; font-size: 11px; }

/* 窄屏页头收紧：EN 态“中文”胶囊更宽，375px 下需缩排避免横向溢出 */
@media (max-width: 420px) {
  .header-inner { padding: 0 10px; gap: 6px; }
  .logo { font-size: 15px; gap: 6px; }
  .logo-mark { width: 26px; height: 26px; font-size: 13px; border-radius: 7px; }
  .lang-btn { padding: 5px 9px; font-size: 12px; }
  .header-actions { gap: 5px; margin-left: 4px; }
  .nav-burger { width: 36px; height: 36px; }
  .nav-burger svg { width: 20px; height: 20px; }
}

/* ---------------- 首页搜索指南结果 ---------------- */
#guideWrap .guide-card {
  display: flex; align-items: center; gap: 12px; margin-top: 4px;
  padding: 14px 16px; border-radius: var(--radius);
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 8%, var(--surface)), var(--surface));
  border: 1px solid color-mix(in srgb, var(--accent) 22%, var(--border));
  color: var(--text); text-decoration: none; transition: border-color .15s, box-shadow .15s, transform .15s;
}
#guideWrap .guide-card:hover { border-color: var(--accent); box-shadow: var(--shadow); transform: translateY(-1px); text-decoration: none; }
#guideWrap .g-ico { width: 40px; height: 40px; flex: none; border-radius: 10px; display: grid; place-items: center; font-size: 20px; background: color-mix(in srgb, var(--accent) 14%, var(--surface)); }
#guideWrap .guide-card b { font-size: 15px; }
#guideWrap .guide-card p { margin: 2px 0 0; font-size: 13px; color: var(--text-2); }
#guideWrap .g-tag { margin-left: auto; flex: none; font-size: 12px; font-weight: 600; color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, var(--surface)); border-radius: 999px; padding: 3px 11px; }
@media (max-width: 480px) { #guideWrap .guide-card { flex-wrap: wrap; } #guideWrap .g-tag { margin-left: 52px; } }
.kv-table th { padding: 6px 10px 7px; border-bottom: 1px solid var(--border-strong); color: var(--text-2); font-size: 12px; font-weight: 600; text-align: left; }
.kv-table th:first-child { width: 40%; }

/* 深色态页头分类按钮：底色压暗保证白字 ≥4.5:1（见轮40对比度审计） */
/* 轮40对比度审计：页头分类按钮底色 cat 压暗 78%（白字≥4.9:1），hover 62% */

/* 深色态激活胶囊：亮蓝底配深色字（白字仅 3.18，见轮41对比度扫查） */
html[data-theme="dark"] .cat-filter .chip.active { color: #0b1220; }
@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]):not([data-theme="dark"]) .cat-filter .chip.active { color: #0b1220; }
}