/* ============================================================
   AIPCB.cc — AI 驱动的 PCB/PCBA 设计辅助平台
   Design System v1.0
   深色科技风 · 电路板绿 · 数据密集型工具站
   ============================================================ */

:root {
  /* 色彩 */
  --bg-0: #070d0f;
  --bg-1: #0b1417;
  --bg-2: #101d21;
  --bg-3: #16272c;
  --bg-glass: rgba(16, 29, 33, 0.72);
  --line-1: #1e3338;
  --line-2: #2a454b;
  --txt-0: #e8f4f2;
  --txt-1: #b7c9c7;
  --txt-2: #7d9693;
  --accent: #2ee6a8;        /* 电路板绿 */
  --accent-2: #00b374;
  --accent-dim: rgba(46, 230, 168, 0.12);
  --accent-glow: rgba(46, 230, 168, 0.45);
  --gold: #f5b841;
  --blue: #4da8ff;
  --red: #ff6b6b;
  --purple: #b07cff;

  /* 字体 */
  --font-sans: "Inter", "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Cascadia Code", "Consolas", "SF Mono", monospace;

  /* 圆角与阴影 */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;
  --r-xl: 22px;
  --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-2: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-3: 0 16px 48px rgba(0, 0, 0, 0.5);

  /* 布局 */
  --nav-h: 64px;
  --container: 1200px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg-0);
  color: var(--txt-0);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; transition: color 0.15s; }
a:hover { color: #7bf3c8; }
button { font-family: inherit; cursor: pointer; }
input, select, textarea { font-family: inherit; color: var(--txt-0); }
::selection { background: rgba(46, 230, 168, 0.3); }

/* 电路板纹理背景 */
body::before {
  content: "";
  position: fixed; inset: 0;
  background:
    radial-gradient(1000px 500px at 85% -10%, rgba(46, 230, 168, 0.08), transparent 60%),
    radial-gradient(800px 400px at -10% 30%, rgba(77, 168, 255, 0.06), transparent 55%),
    linear-gradient(var(--bg-0), var(--bg-0));
  pointer-events: none;
  z-index: -1;
}
.trace-bg {
  background-image:
    linear-gradient(rgba(46, 230, 168, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46, 230, 168, 0.05) 1px, transparent 1px);
  background-size: 34px 34px;
}

/* ---------- 布局容器 ---------- */
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section { padding: 88px 0; }
.section-tight { padding: 56px 0; }
.section-alt { background: var(--bg-1); border-top: 1px solid var(--line-1); border-bottom: 1px solid var(--line-1); }

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  height: var(--nav-h);
  background: rgba(7, 13, 15, 0.85);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-1);
}
.nav-inner { max-width: var(--container); margin: 0 auto; padding: 0 24px; height: 100%; display: flex; align-items: center; gap: 28px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 19px; letter-spacing: 0.2px; color: var(--txt-0); }
.logo:hover { color: var(--txt-0); }
.logo-mark {
  width: 34px; height: 34px; border-radius: 9px;
  background: linear-gradient(135deg, var(--accent-2), #0d5c43);
  display: grid; place-items: center;
  box-shadow: 0 0 18px var(--accent-glow);
}
.logo-mark svg { width: 20px; height: 20px; }
.logo b { color: var(--accent); }
.nav-links { display: flex; gap: 4px; margin-left: 8px; flex: 1; }
.nav-links a {
  color: var(--txt-1); padding: 8px 14px; border-radius: 8px; font-size: 14.5px; font-weight: 500;
}
.nav-links a:hover { color: var(--txt-0); background: var(--bg-2); }
.nav-links a.active { color: var(--accent); background: var(--accent-dim); }
.nav-cta { display: flex; gap: 10px; align-items: center; }
.nav-burger { display: none; background: none; border: 1px solid var(--line-2); color: var(--txt-0); border-radius: 8px; padding: 8px 10px; }
.nav-mobile {
  display: none; position: fixed; top: var(--nav-h); left: 0; right: 0; z-index: 99;
  background: var(--bg-1); border-bottom: 1px solid var(--line-1); padding: 12px 20px 20px;
  flex-direction: column; gap: 6px;
}
.nav-mobile.open { display: flex; }
.nav-mobile a { color: var(--txt-1); padding: 10px 12px; border-radius: 8px; font-weight: 500; }
.nav-mobile a:hover { background: var(--bg-2); color: var(--txt-0); }
.nav-mobile a.active { color: var(--accent); background: var(--accent-dim); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 22px; border-radius: 9px;
  font-weight: 600; font-size: 14.5px; line-height: 1.4;
  border: 1px solid transparent; transition: all 0.18s;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: linear-gradient(135deg, var(--accent-2), #17b98a); color: #03211a; box-shadow: 0 4px 16px rgba(46, 230, 168, 0.25); }
.btn-primary:hover { box-shadow: 0 6px 22px var(--accent-glow); color: #03211a; filter: brightness(1.08); }
.btn-ghost { border-color: var(--line-2); color: var(--txt-0); background: rgba(22, 39, 44, 0.4); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-dim); }
.btn-sm { padding: 7px 14px; font-size: 13px; border-radius: 7px; }
.btn-lg { padding: 14px 30px; font-size: 16px; border-radius: 11px; }
.btn-block { width: 100%; justify-content: center; }
.btn[disabled] { opacity: 0.45; cursor: not-allowed; }

/* ---------- 排版 ---------- */
h1, h2, h3, h4 { line-height: 1.25; font-weight: 700; letter-spacing: -0.01em; }
.hero h1 { font-size: clamp(34px, 5vw, 56px); font-weight: 800; }
h2.sec-title { font-size: clamp(26px, 3.4vw, 38px); }
h3.card-title { font-size: 18px; }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 52px; }
.section-head .eyebrow { color: var(--accent); font-weight: 700; letter-spacing: 3px; font-size: 13px; text-transform: uppercase; margin-bottom: 12px; display: block; }
.section-head p.lead { color: var(--txt-1); font-size: 16.5px; margin-top: 14px; }
.eyebrow { color: var(--accent); font-weight: 700; letter-spacing: 3px; font-size: 12.5px; text-transform: uppercase; }
.grad-text { background: linear-gradient(92deg, #2ee6a8 0%, #4da8ff 100%); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ---------- Hero ---------- */
.hero { position: relative; padding: 100px 0 90px; overflow: hidden; }
.hero::after {
  content: ""; position: absolute; left: 50%; top: 40px; transform: translateX(-50%);
  width: 900px; height: 420px; pointer-events: none;
  background: radial-gradient(ellipse at center, rgba(46, 230, 168, 0.14), transparent 65%);
}
.hero-grid { position: relative; display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 56px; align-items: center; }
.hero .lead { color: var(--txt-1); font-size: 18px; margin: 22px 0 34px; max-width: 560px; }
.hero-badges { display: flex; gap: 12px; margin-top: 26px; flex-wrap: wrap; }
.hero-chip { display: inline-flex; align-items: center; gap: 8px; padding: 7px 14px; border-radius: 999px; background: var(--bg-2); border: 1px solid var(--line-1); color: var(--txt-1); font-size: 13px; font-weight: 600; }
.hero-chip svg { width: 15px; height: 15px; color: var(--accent); }

/* 电路板示意画板 */
.board-visual { position: relative; border-radius: var(--r-xl); overflow: hidden; }
.board-canvas-wrap { background: #04150e; border: 1px solid #123a2c; border-radius: var(--r-lg); padding: 14px; box-shadow: var(--shadow-3), 0 0 60px rgba(46, 230, 168, 0.08); }
.board-canvas-wrap svg { width: 100%; height: auto; border-radius: 10px; display: block; background: #06241a; }
.board-float {
  position: absolute; background: var(--bg-glass); backdrop-filter: blur(10px);
  border: 1px solid var(--line-2); border-radius: 12px; padding: 10px 14px;
  box-shadow: var(--shadow-2); font-size: 12.5px;
}
.board-float b { color: var(--accent); font-family: var(--font-mono); font-size: 13px; }
.board-float .lbl { color: var(--txt-2); font-size: 11px; }
.f1 { top: -14px; right: 18px; }
.f2 { bottom: -14px; left: 22px; }

/* ---------- 卡片 ---------- */
.card {
  background: var(--bg-2); border: 1px solid var(--line-1); border-radius: var(--r-lg);
  padding: 26px; transition: all 0.2s; position: relative;
}
.card:hover { border-color: var(--line-2); transform: translateY(-3px); box-shadow: var(--shadow-2); }
.card.accent-border:hover { border-color: rgba(46, 230, 168, 0.5); }
.card-icon {
  width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center;
  background: var(--accent-dim); color: var(--accent); margin-bottom: 18px;
}
.card-icon svg { width: 24px; height: 24px; }
.card-icon.blue { background: rgba(77, 168, 255, 0.12); color: var(--blue); }
.card-icon.gold { background: rgba(245, 184, 65, 0.12); color: var(--gold); }
.card-icon.purple { background: rgba(176, 124, 255, 0.12); color: var(--purple); }
.card p { color: var(--txt-1); font-size: 14px; margin-top: 10px; }
.card .card-link { display: inline-flex; align-items: center; gap: 6px; margin-top: 16px; font-weight: 600; font-size: 14px; color: var(--accent); }
.card .card-link svg { width: 15px; height: 15px; transition: transform 0.15s; }
.card:hover .card-link svg { transform: translateX(3px); }
.tag { display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; background: var(--bg-3); color: var(--txt-1); border: 1px solid var(--line-2); }
.tag.green { background: var(--accent-dim); color: var(--accent); border-color: rgba(46, 230, 168, 0.35); }
.tag.blue { background: rgba(77, 168, 255, 0.1); color: var(--blue); border-color: rgba(77, 168, 255, 0.3); }
.tag.gold { background: rgba(245, 184, 65, 0.1); color: var(--gold); border-color: rgba(245, 184, 65, 0.3); }
.tag.red { background: rgba(255, 107, 107, 0.1); color: var(--red); border-color: rgba(255, 107, 107, 0.3); }

/* 网格 */
.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- 工具区面板 ---------- */
.tool-hero { padding: 60px 0 40px; }
.tool-hero h1 { font-size: clamp(26px, 3.4vw, 40px); }
.tool-hero .lead { color: var(--txt-1); font-size: 16px; margin-top: 12px; max-width: 720px; }
.panel { background: var(--bg-2); border: 1px solid var(--line-1); border-radius: var(--r-lg); padding: 26px; margin-top: 24px; }
.panel-title { font-size: 16px; font-weight: 700; display: flex; align-items: center; gap: 10px; margin-bottom: 18px; }
.panel-title .idx { width: 26px; height: 26px; border-radius: 8px; background: var(--accent-dim); color: var(--accent); display: grid; place-items: center; font-size: 13px; font-weight: 800; }
.tool-layout { display: grid; grid-template-columns: 380px 1fr; gap: 24px; align-items: start; }
.tool-layout.wide { grid-template-columns: 1fr; }

/* 上传区 */
.dropzone {
  border: 2px dashed var(--line-2); border-radius: var(--r-lg); padding: 46px 24px;
  text-align: center; cursor: pointer; transition: all 0.2s; background: var(--bg-1);
}
.dropzone:hover, .dropzone.drag { border-color: var(--accent); background: var(--accent-dim); }
.dropzone .dz-icon { width: 54px; height: 54px; margin: 0 auto 14px; border-radius: 14px; background: var(--bg-3); display: grid; place-items: center; color: var(--accent); }
.dropzone .dz-icon svg { width: 28px; height: 28px; }
.dropzone b { font-size: 16px; }
.dropzone p { color: var(--txt-2); font-size: 13px; margin-top: 8px; }
.dropzone input[type="file"] { display: none; }

/* 表单 */
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; font-weight: 600; color: var(--txt-1); margin-bottom: 7px; }
.field .hint { font-size: 12px; color: var(--txt-2); font-weight: 400; margin-left: 6px; }
.input, select.input, textarea.input {
  width: 100%; padding: 10px 13px; border-radius: 9px; border: 1px solid var(--line-2);
  background: var(--bg-1); color: var(--txt-0); font-size: 14.5px; outline: none; transition: border 0.15s;
}
.input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-dim); }
.input-mono { font-family: var(--font-mono); font-size: 13.5px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.field-row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 14px; }

/* 结果区 */
.result-box { border-radius: var(--r-lg); border: 1px solid var(--line-1); background: var(--bg-1); padding: 22px; margin-top: 18px; }
.result-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; }
.result-item { background: var(--bg-2); border: 1px solid var(--line-1); border-radius: 12px; padding: 16px; text-align: center; }
.result-item .v { font-family: var(--font-mono); font-size: 26px; font-weight: 800; color: var(--accent); }
.result-item .k { font-size: 12.5px; color: var(--txt-2); margin-top: 5px; }

/* 表格 */
.table-wrap { overflow-x: auto; border: 1px solid var(--line-1); border-radius: var(--r-md); }
table.tbl { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 520px; }
.tbl th { background: var(--bg-3); color: var(--txt-0); text-align: left; padding: 11px 14px; font-weight: 600; white-space: nowrap; border-bottom: 1px solid var(--line-2); }
.tbl td { padding: 10px 14px; border-bottom: 1px solid var(--line-1); color: var(--txt-1); }
.tbl tr:last-child td { border-bottom: none; }
.tbl tbody tr:hover td { background: rgba(46, 230, 168, 0.04); }
.tbl td.mono, .tbl th.mono { font-family: var(--font-mono); font-size: 12.5px; }
.tbl .num { text-align: right; font-family: var(--font-mono); }

/* 提示条 */
.alert { display: flex; gap: 12px; align-items: flex-start; padding: 14px 16px; border-radius: 11px; font-size: 14px; margin-top: 16px; border: 1px solid; }
.alert svg { width: 20px; height: 20px; flex-shrink: 0; margin-top: 1px; }
.alert.info { background: rgba(77, 168, 255, 0.08); border-color: rgba(77, 168, 255, 0.3); color: #bcd9ff; }
.alert.warn { background: rgba(245, 184, 65, 0.08); border-color: rgba(245, 184, 65, 0.3); color: #ffe3a8; }
.alert.ok { background: rgba(46, 230, 168, 0.08); border-color: rgba(46, 230, 168, 0.3); color: #b7f5dc; }
.alert.err { background: rgba(255, 107, 107, 0.08); border-color: rgba(255, 107, 107, 0.3); color: #ffc9c9; }

/* 检查清单 */
.check-item { display: flex; gap: 12px; padding: 12px 0; border-bottom: 1px dashed var(--line-1); align-items: flex-start; }
.check-item:last-child { border-bottom: none; }
.check-dot { width: 22px; height: 22px; border-radius: 7px; border: 2px solid var(--line-2); flex-shrink: 0; display: grid; place-items: center; margin-top: 1px; }
.check-dot.pass { background: var(--accent-dim); border-color: var(--accent); color: var(--accent); }
.check-dot.warn { background: rgba(245, 184, 65, 0.12); border-color: var(--gold); color: var(--gold); }
.check-dot.fail { background: rgba(255, 107, 107, 0.12); border-color: var(--red); color: var(--red); }
.check-dot svg { width: 13px; height: 13px; }
.check-item b { font-size: 14px; }
.check-item .detail { font-size: 13px; color: var(--txt-2); margin-top: 2px; }

/* 步骤条 */
.steps { display: flex; gap: 8px; margin-bottom: 26px; flex-wrap: wrap; }
.step { flex: 1; min-width: 150px; padding: 12px 16px; border-radius: 11px; background: var(--bg-1); border: 1px solid var(--line-1); color: var(--txt-2); font-size: 13.5px; font-weight: 600; display: flex; gap: 10px; align-items: center; }
.step .n { width: 24px; height: 24px; border-radius: 8px; background: var(--bg-3); display: grid; place-items: center; font-size: 12px; font-weight: 800; flex-shrink: 0; }
.step.active { border-color: rgba(46, 230, 168, 0.5); color: var(--txt-0); background: var(--accent-dim); }
.step.active .n { background: var(--accent); color: #03211a; }
.step.done { border-color: var(--accent); color: var(--accent); }
.step.done .n { background: var(--accent); color: #03211a; }

/* 层控制 */
.layer-list { display: flex; flex-direction: column; gap: 6px; max-height: 300px; overflow-y: auto; padding-right: 4px; }
.layer-row { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: 8px; background: var(--bg-1); border: 1px solid var(--line-1); font-size: 13.5px; cursor: pointer; user-select: none; }
.layer-row:hover { border-color: var(--line-2); }
.layer-row .swatch { width: 14px; height: 14px; border-radius: 4px; flex-shrink: 0; }
.layer-row .lname { flex: 1; font-family: var(--font-mono); font-size: 12.5px; color: var(--txt-1); }
.layer-row input[type="checkbox"] { accent-color: var(--accent); width: 15px; height: 15px; }

/* 滚动条 */
::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-track { background: var(--bg-1); }
::-webkit-scrollbar-thumb { background: var(--line-2); border-radius: 6px; }
::-webkit-scrollbar-thumb:hover { background: #3a5a61; }

/* 页脚 */
.footer { border-top: 1px solid var(--line-1); background: var(--bg-1); padding: 56px 0 30px; margin-top: 90px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 36px; }
.footer h5 { font-size: 14px; margin-bottom: 14px; letter-spacing: 0.5px; }
.footer a.flink { display: block; color: var(--txt-2); font-size: 13.5px; padding: 4px 0; }
.footer a.flink:hover { color: var(--accent); }
.footer .fdesc { color: var(--txt-2); font-size: 13.5px; margin-top: 12px; max-width: 320px; }
.footer-bottom { margin-top: 40px; padding-top: 22px; border-top: 1px solid var(--line-1); display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; color: var(--txt-2); font-size: 12.5px; }
.footer-bottom a { color: var(--txt-2); }
.footer-bottom a:hover { color: var(--accent); }

/* 面包屑 */
.crumbs { display: flex; gap: 8px; align-items: center; font-size: 13px; color: var(--txt-2); margin-bottom: 18px; }
.crumbs a { color: var(--txt-2); }
.crumbs a:hover { color: var(--accent); }
.crumbs svg { width: 13px; height: 13px; }

/* 内容页通用 */
.prose { color: var(--txt-1); font-size: 15px; max-width: 860px; }
.prose h2 { color: var(--txt-0); font-size: 24px; margin: 44px 0 16px; }
.prose h3 { color: var(--txt-0); font-size: 18px; margin: 30px 0 12px; }
.prose p { margin-bottom: 14px; }
.prose ul { padding-left: 22px; margin-bottom: 14px; }
.prose li { margin-bottom: 7px; }
.prose code { font-family: var(--font-mono); font-size: 13px; background: var(--bg-3); padding: 2px 7px; border-radius: 5px; color: var(--accent); }
.prose table { margin: 18px 0; }
.prose strong { color: var(--txt-0); }

/* 特性行 */
.feature-row { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; padding: 40px 0; }
.feature-row.reverse .feature-media { order: -1; }
.feature-media { border-radius: var(--r-xl); overflow: hidden; border: 1px solid var(--line-1); background: var(--bg-2); padding: 20px; }
.feature-media svg { width: 100%; height: auto; border-radius: 10px; }
.feature-copy h3 { font-size: 26px; margin-bottom: 14px; }
.feature-copy p { color: var(--txt-1); margin-bottom: 14px; }
.feature-list { list-style: none; padding: 0; }
.feature-list li { display: flex; gap: 10px; padding: 7px 0; color: var(--txt-1); font-size: 14.5px; }
.feature-list svg { width: 18px; height: 18px; color: var(--accent); flex-shrink: 0; margin-top: 3px; }

/* CTA 横幅 */
.cta-banner { position: relative; border-radius: var(--r-xl); overflow: hidden; padding: 54px 48px; background: linear-gradient(120deg, #0d2b22, #0b1f2e); border: 1px solid rgba(46, 230, 168, 0.25); text-align: center; }
.cta-banner h2 { font-size: clamp(24px, 3vw, 34px); margin-bottom: 12px; }
.cta-banner p { color: var(--txt-1); max-width: 560px; margin: 0 auto 26px; }
.cta-banner .cta-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* 工具表单卡片 */
.form-card { background: var(--bg-1); border: 1px solid var(--line-1); border-radius: var(--r-md); padding: 18px; margin-bottom: 16px; }
.form-card h4 { font-size: 14.5px; margin-bottom: 14px; display: flex; align-items: center; gap: 8px; }
.form-card h4 svg { width: 17px; height: 17px; color: var(--accent); }

/* 分段控制 */
.seg { display: inline-flex; background: var(--bg-1); border: 1px solid var(--line-1); border-radius: 9px; padding: 3px; gap: 3px; }
.seg button { border: none; background: none; color: var(--txt-2); padding: 7px 15px; border-radius: 7px; font-size: 13.5px; font-weight: 600; }
.seg button.active { background: var(--accent); color: #03211a; }

/* 加载动画 */
.spinner { width: 22px; height: 22px; border: 3px solid var(--line-2); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.fade-in { animation: fadeIn 0.4s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* 代码块 */
pre.code-block { background: var(--bg-1); border: 1px solid var(--line-1); border-radius: var(--r-md); padding: 16px 18px; font-family: var(--font-mono); font-size: 13px; color: var(--txt-1); overflow-x: auto; line-height: 1.7; }

/* 状态徽标 */
.badge { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 700; padding: 4px 11px; border-radius: 999px; }
.badge::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
.badge.ready { background: var(--accent-dim); color: var(--accent); }
.badge.beta { background: rgba(176, 124, 255, 0.12); color: var(--purple); }
.badge.busy { background: rgba(245, 184, 65, 0.1); color: var(--gold); }

/* 空状态 */
.empty { text-align: center; padding: 60px 20px; color: var(--txt-2); }
.empty svg { width: 48px; height: 48px; margin: 0 auto 14px; color: var(--line-2); }
.empty b { color: var(--txt-1); display: block; margin-bottom: 6px; font-size: 15px; }

/* 响应式 */
@media (max-width: 1080px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .tool-layout { grid-template-columns: 1fr; }
  .feature-row { grid-template-columns: 1fr; gap: 36px; }
  .feature-row.reverse .feature-media { order: 0; }
}
@media (max-width: 860px) {
  .nav-links, .nav-cta .btn-ghost { display: none; }
  .nav-burger { display: inline-flex; }
  .hero-grid { grid-template-columns: 1fr; gap: 48px; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .section { padding: 60px 0; }
  .field-row, .field-row-3 { grid-template-columns: 1fr; }
  .cta-banner { padding: 40px 24px; }
}
@media (max-width: 520px) {
  .grid-4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero { padding: 64px 0; }
}