/* ============================================================
   Eunomia 技术导览 · 深色主题 · 零依赖
   ============================================================ */
:root {
  --bg: #0b0f14;
  --bg-soft: #10161d;
  --card: rgba(255, 255, 255, 0.04);
  --card-hover: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text: #e6edf3;
  --text-dim: #9aa7b4;
  --text-faint: #6b7784;
  --accent: #4ade80;      /* 球场绿 */
  --accent-2: #38bdf8;    /* 线路蓝 */
  --accent-warm: #fbbf24; /* 提示黄 */
  --danger: #f87171;
  --grad: linear-gradient(100deg, #4ade80, #38bdf8);
  --radius: 14px;
  --radius-sm: 9px;
  --mono: ui-monospace, "Cascadia Code", Consolas, "Courier New", monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
::selection { background: rgba(74, 222, 128, 0.3); }

/* ---------- 滚动出现动画 ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ============================================================
   顶部导航
   ============================================================ */
.topbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(11, 15, 20, 0.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: 1080px; margin: 0 auto; padding: 0 20px;
  display: flex; align-items: center; gap: 18px; height: 56px;
}
.brand {
  color: var(--text); text-decoration: none; font-weight: 700; white-space: nowrap;
  display: flex; align-items: center; gap: 8px;
}
.brand span { color: var(--accent); }
.topnav {
  display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; margin-left: auto;
}
.topnav::-webkit-scrollbar { display: none; }
.topnav a {
  color: var(--text-dim); text-decoration: none; font-size: 13.5px;
  padding: 6px 11px; border-radius: 999px; white-space: nowrap; transition: all .2s;
}
.topnav a:hover { color: var(--text); background: var(--card-hover); }
.topnav a.active { color: #0b0f14; background: var(--accent); font-weight: 600; }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  padding: 84px 20px 40px;
  background:
    radial-gradient(700px 380px at 15% -5%, rgba(74, 222, 128, 0.13), transparent 60%),
    radial-gradient(700px 380px at 85% 5%, rgba(56, 189, 248, 0.12), transparent 60%);
}
.hero-inner { max-width: 880px; margin: 0 auto; }
.hero-kicker {
  display: inline-block; font-size: 13px; color: var(--accent);
  border: 1px solid rgba(74, 222, 128, 0.35); border-radius: 999px;
  padding: 4px 14px; margin-bottom: 22px; background: rgba(74, 222, 128, 0.07);
}
.hero h1 { font-size: clamp(30px, 5.2vw, 50px); line-height: 1.28; font-weight: 800; letter-spacing: -0.5px; }
.hero-sub { margin-top: 20px; color: var(--text-dim); font-size: 16.5px; max-width: 720px; }
.hero-sub b { color: var(--text); }
.hero-stats { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 34px; }
.stat {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 14px 22px; min-width: 120px;
}
.stat b { display: block; font-size: 26px; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat span { font-size: 12.5px; color: var(--text-dim); }
.hero-cta { margin-top: 30px; display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-block; padding: 10px 22px; border-radius: 10px;
  text-decoration: none; font-size: 14.5px; font-weight: 600; cursor: pointer;
  border: 1px solid transparent; transition: all .2s; background: none; color: var(--text);
  font-family: inherit;
}
.btn-primary { background: var(--grad); color: #08130c; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(74, 222, 128, 0.25); }
.btn-ghost { border-color: var(--border-strong); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* 60秒版本 */
.tldr {
  margin-top: 44px; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px 26px;
}
.tldr h3 { font-size: 16px; margin-bottom: 14px; }
.tldr ol { padding-left: 20px; color: var(--text-dim); font-size: 14.5px; }
.tldr li { margin-bottom: 9px; }
.tldr li b { color: var(--text); }
.tldr li::marker { color: var(--accent); font-weight: 700; }

/* ============================================================
   章节通用
   ============================================================ */
.section { padding: 76px 20px; }
.section-alt { background: var(--bg-soft); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-inner { max-width: 1080px; margin: 0 auto; }
.sec-kicker {
  font-size: 13px; letter-spacing: 2px; color: var(--accent-2);
  font-weight: 600; text-transform: uppercase; margin-bottom: 10px;
}
.section h2 { font-size: clamp(23px, 3.4vw, 32px); line-height: 1.35; font-weight: 800; letter-spacing: -0.3px; }
.grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.sec-sub { color: var(--text-dim); margin-top: 12px; max-width: 760px; font-size: 15px; }
.sec-sub b { color: var(--text); }
.inline-link { color: var(--accent-2); text-decoration: none; border-bottom: 1px dashed rgba(56, 189, 248, 0.5); }
.inline-link:hover { color: var(--text); }

/* ============================================================
   架构图
   ============================================================ */
.arch { margin-top: 44px; display: flex; flex-direction: column; gap: 0; }
.arch-layer {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 18px;
}
.arch-layer-app { border-color: rgba(74, 222, 128, 0.3); background: rgba(74, 222, 128, 0.045); }
.arch-layer-infra { border-style: dashed; }
.layer-label { font-size: 12px; color: var(--text-faint); letter-spacing: 1.5px; margin-bottom: 10px; }
.layer-nodes { display: flex; gap: 10px; flex-wrap: wrap; align-items: stretch; }
.layer-nodes.three > .node { flex: 1 1 180px; }
.layer-nodes.four > .node { flex: 1 1 150px; }
.layer-note { margin-top: 12px; font-size: 13px; color: var(--accent-warm); }
.arch-arrow {
  align-self: center; color: var(--text-faint); font-size: 12.5px;
  padding: 7px 0; text-align: center; position: relative;
}
.arch-arrow span { background: var(--bg); padding: 0 12px; position: relative; z-index: 1; }
.arch-arrow::before {
  content: ""; position: absolute; top: 50%; left: 10%; right: 10%; height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-strong), transparent);
}
.inner-arrow { align-self: center; color: var(--text-faint); font-size: 18px; }

.node {
  background: rgba(255, 255, 255, 0.05); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 13px 16px; color: var(--text);
  font-size: 14.5px; font-weight: 600; cursor: pointer; text-align: center;
  font-family: inherit; transition: all .18s; line-height: 1.4;
}
.node small { display: block; font-weight: 400; }
.node-tag { display: block; font-size: 11.5px; font-weight: 400; color: var(--text-dim); margin-top: 3px; }
.node:hover { border-color: var(--accent); background: rgba(74, 222, 128, 0.08); transform: translateY(-2px); }
.node.active {
  border-color: var(--accent); background: rgba(74, 222, 128, 0.13);
  box-shadow: 0 0 0 1px var(--accent), 0 6px 20px rgba(74, 222, 128, 0.18);
}
.node-people:hover, .node-people.active { border-color: var(--accent-warm); background: rgba(251, 191, 36, 0.09); box-shadow: 0 0 0 1px var(--accent-warm); }
.node-client:hover, .node-client.active { border-color: var(--accent-2); background: rgba(56, 189, 248, 0.09); box-shadow: 0 0 0 1px var(--accent-2); }
.node-db:hover, .node-db.active { border-color: #c084fc; background: rgba(192, 132, 252, 0.09); box-shadow: 0 0 0 1px #c084fc; }
.node-infra:hover, .node-infra.active { border-color: #94a3b8; background: rgba(148, 163, 184, 0.09); box-shadow: 0 0 0 1px #94a3b8; }

/* ============================================================
   详情面板（架构节点 / 链路步骤共用）
   ============================================================ */
.detail-panel {
  margin-top: 22px; background: linear-gradient(160deg, rgba(74, 222, 128, 0.06), rgba(56, 189, 248, 0.05));
  border: 1px solid var(--border-strong); border-radius: var(--radius);
  padding: 24px 26px; position: relative;
  animation: panelIn .3s ease;
}
@keyframes panelIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
.detail-close {
  position: absolute; top: 12px; right: 12px; background: none; border: 1px solid var(--border);
  color: var(--text-dim); width: 30px; height: 30px; border-radius: 50%; cursor: pointer; font-size: 13px;
  transition: all .2s;
}
.detail-close:hover { color: var(--text); border-color: var(--border-strong); }
.detail-badge {
  display: inline-block; font-size: 12px; color: var(--accent);
  border: 1px solid rgba(74, 222, 128, 0.35); border-radius: 999px; padding: 2px 12px;
  background: rgba(74, 222, 128, 0.07); margin-bottom: 10px;
}
.detail-panel h3 { font-size: 19px; margin-bottom: 14px; }
.detail-block { margin-top: 14px; }
.detail-block h4 { font-size: 13px; color: var(--accent-2); margin-bottom: 5px; letter-spacing: 0.5px; }
.detail-block p { font-size: 14.5px; color: var(--text-dim); }
.detail-block p b { color: var(--text); }
.file-chips { display: flex; gap: 8px; flex-wrap: wrap; }
.file-chip {
  font-family: var(--mono); font-size: 12px; color: var(--text-dim);
  background: rgba(255, 255, 255, 0.05); border: 1px solid var(--border);
  border-radius: 6px; padding: 4px 10px;
}

/* ============================================================
   技术栈卡片
   ============================================================ */
.tech-grid { margin-top: 40px; display: grid; grid-template-columns: repeat(auto-fill, minmax(310px, 1fr)); gap: 16px; }
.tech-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px 22px; transition: all .2s;
}
.tech-card:hover { border-color: var(--border-strong); background: var(--card-hover); }
.tech-card-head { display: flex; align-items: baseline; gap: 10px; margin-bottom: 4px; }
.tech-card-head h3 { font-size: 17px; }
.tech-card-ver { font-size: 12px; color: var(--text-faint); font-family: var(--mono); }
.tech-tabs { display: flex; gap: 6px; margin: 12px 0; }
.tech-tab {
  flex: 1; background: none; border: 1px solid var(--border); color: var(--text-dim);
  font-size: 12px; padding: 6px 4px; border-radius: 7px; cursor: pointer; font-family: inherit;
  transition: all .15s;
}
.tech-tab:hover { color: var(--text); }
.tech-tab.active { background: rgba(74, 222, 128, 0.13); border-color: var(--accent); color: var(--accent); font-weight: 600; }
.tech-body { font-size: 13.8px; color: var(--text-dim); min-height: 96px; }
.tech-body b { color: var(--text); }
.tech-body ul { padding-left: 18px; }
.tech-body li { margin-bottom: 5px; }

/* ============================================================
   链路步骤条
   ============================================================ */
.pipe-controls { display: flex; align-items: center; gap: 14px; margin-top: 26px; flex-wrap: wrap; }
.pipe-hint { font-size: 13px; color: var(--text-faint); }
.pipe-steps { display: flex; gap: 0; margin-top: 14px; flex-wrap: wrap; }
.pipe-steps.vertical { flex-direction: column; gap: 8px; margin-top: 14px; }
.pipe-step {
  display: flex; align-items: center; gap: 10px;
  background: var(--card); border: 1px solid var(--border); color: var(--text);
  padding: 11px 15px; cursor: pointer; font-size: 13.8px; font-weight: 600;
  font-family: inherit; transition: all .18s; position: relative; text-align: left;
  border-radius: var(--radius-sm); margin-right: 26px; margin-bottom: 12px;
}
.pipe-step::after {
  content: "→"; position: absolute; right: -20px; color: var(--text-faint); font-size: 15px;
}
.pipe-step:last-child::after { content: none; }
.pipe-step:hover { border-color: var(--accent-2); background: rgba(56, 189, 248, 0.07); }
.pipe-step.active {
  border-color: var(--accent-2); background: rgba(56, 189, 248, 0.12);
  box-shadow: 0 0 0 1px var(--accent-2);
}
.pipe-step.done { border-color: rgba(74, 222, 128, 0.4); }
.pipe-step .step-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 22px; height: 22px; border-radius: 50%; font-size: 11.5px; flex-shrink: 0;
  background: rgba(255, 255, 255, 0.08); color: var(--text-dim);
}
.pipe-step.active .step-num { background: var(--accent-2); color: #08131c; font-weight: 700; }
.pipe-steps.vertical .pipe-step { margin-right: 0; }
.pipe-steps.vertical .pipe-step::after { content: none; }

/* 自动演示时的呼吸高亮 */
@keyframes pulseStep { 0%,100% { box-shadow: 0 0 0 1px var(--accent-2); } 50% { box-shadow: 0 0 0 4px rgba(56,189,248,0.25); } }
.pipe-step.playing { animation: pulseStep 1s ease infinite; }

/* ============================================================
   代码块
   ============================================================ */
.code-mini, .code-block {
  font-family: var(--mono); font-size: 12.8px; line-height: 1.65;
  background: #0d1218; border: 1px solid var(--border); border-radius: 10px;
  padding: 14px 16px; overflow-x: auto; color: #c9d6e3;
}
.code-block { font-size: 13.2px; padding: 18px 20px; margin: 16px 0; }
.code-mini { margin: 0; color: #b7e5c8; }
.code-moment {
  margin-top: 44px; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 26px 28px;
  border-left: 3px solid var(--accent);
}
.code-moment-tag {
  font-size: 12px; letter-spacing: 1.5px; color: var(--accent); font-weight: 700; margin-bottom: 8px;
}
.code-moment h3 { font-size: 18px; margin-bottom: 10px; }
.code-moment p { font-size: 14.3px; color: var(--text-dim); }
.code-moment p b { color: var(--text); }
.code-moment p code, .eng-card code, .tldr code, .acc-body code, .footer code, .insight-box code {
  font-family: var(--mono); font-size: 0.88em; background: rgba(255, 255, 255, 0.07);
  border-radius: 5px; padding: 1.5px 6px; color: #a5d6ff;
}
.code-moment-note {
  margin-top: 12px; padding: 12px 16px; border-radius: 10px;
  background: rgba(251, 191, 36, 0.07); border: 1px solid rgba(251, 191, 36, 0.25);
  font-size: 13.8px; color: var(--text-dim) !important;
}
.code-moment-note b { color: var(--accent-warm) !important; }

/* ============================================================
   洞察框 / 鉴权 / 工程化
   ============================================================ */
.insight-box {
  margin-top: 34px; background: rgba(56, 189, 248, 0.05); border: 1px solid rgba(56, 189, 248, 0.28);
  border-radius: var(--radius); padding: 20px 24px;
}
.insight-box h4 { font-size: 15px; color: var(--accent-2); margin-bottom: 8px; }
.insight-box p { font-size: 14.3px; color: var(--text-dim); }
.insight-box p b { color: var(--text); }

.auth-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin-top: 36px; }
.auth-col {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px 24px;
}
.auth-col h3 { font-size: 16px; margin-bottom: 6px; }

.eng-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); gap: 16px; margin-top: 36px; }
.eng-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px 24px;
}
.eng-card h3 { font-size: 16.5px; margin-bottom: 10px; }
.eng-card p { font-size: 13.8px; color: var(--text-dim); }
.eng-card p b { color: var(--text); }
.eng-card ul { padding-left: 18px; font-size: 13.8px; color: var(--text-dim); margin-top: 8px; }
.eng-card li { margin-bottom: 6px; }
.eng-card li b { color: var(--text); }
.eng-note { margin-top: 12px; font-size: 12.8px !important; color: var(--text-faint) !important; font-style: italic; }

/* ============================================================
   手风琴（取舍演进）
   ============================================================ */
.acc { margin-top: 36px; display: flex; flex-direction: column; gap: 10px; }
.acc-item {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; transition: border-color .2s;
}
.acc-item.open { border-color: rgba(74, 222, 128, 0.4); }
.acc-head {
  width: 100%; display: flex; justify-content: space-between; align-items: center; gap: 14px;
  background: none; border: none; color: var(--text); font-size: 15.5px; font-weight: 600;
  padding: 17px 22px; cursor: pointer; text-align: left; font-family: inherit;
}
.acc-head:hover { color: var(--accent); }
.acc-arrow { transition: transform .25s; color: var(--text-faint); font-size: 13px; flex-shrink: 0; }
.acc-item.open .acc-arrow { transform: rotate(180deg); color: var(--accent); }
.acc-body {
  max-height: 0; overflow: hidden; transition: max-height .3s ease;
  padding: 0 22px;
}
.acc-item.open .acc-body { max-height: 640px; padding-bottom: 20px; }
.acc-body p { font-size: 14.2px; color: var(--text-dim); margin-bottom: 10px; }
.acc-body p b { color: var(--text); }
.acc-body ul { padding-left: 18px; font-size: 14.2px; color: var(--text-dim); }
.acc-body li { margin-bottom: 7px; }
.acc-body li b { color: var(--text); }

/* ============================================================
   自测
   ============================================================ */
.quiz-score {
  margin-top: 26px; display: inline-block; background: var(--card); border: 1px solid var(--border);
  border-radius: 999px; padding: 8px 20px; font-size: 14px; color: var(--text-dim);
}
.quiz-score b { color: var(--accent); font-size: 16px; }
.quiz-list { margin-top: 22px; display: flex; flex-direction: column; gap: 14px; }
.quiz-item {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 24px;
}
.quiz-item.ok { border-color: rgba(74, 222, 128, 0.45); }
.quiz-item.bad { border-color: rgba(248, 113, 113, 0.45); }
.quiz-q { font-size: 15px; font-weight: 600; margin-bottom: 13px; }
.quiz-q .q-num { color: var(--accent-2); margin-right: 6px; }
.quiz-opts { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.quiz-opt {
  background: rgba(255, 255, 255, 0.04); border: 1px solid var(--border); color: var(--text-dim);
  text-align: left; padding: 10px 14px; border-radius: 9px; cursor: pointer;
  font-size: 13.5px; font-family: inherit; transition: all .15s; line-height: 1.5;
}
.quiz-opt:hover { border-color: var(--border-strong); color: var(--text); }
.quiz-opt.correct { border-color: var(--accent); background: rgba(74, 222, 128, 0.1); color: var(--text); }
.quiz-opt.wrong { border-color: var(--danger); background: rgba(248, 113, 113, 0.1); }
.quiz-opt:disabled { cursor: default; opacity: 0.75; }
.quiz-explain {
  margin-top: 12px; font-size: 13.3px; color: var(--text-dim); padding: 12px 15px;
  border-radius: 9px; background: rgba(255, 255, 255, 0.03); border: 1px dashed var(--border-strong);
  display: none;
}
.quiz-item.answered .quiz-explain { display: block; }
.quiz-explain b { color: var(--accent-warm); }
.quiz-back { color: var(--accent-2); text-decoration: none; border-bottom: 1px dashed rgba(56,189,248,.5); }
.quiz-result {
  margin-top: 26px; text-align: center; background: var(--card); border: 1px solid var(--border-strong);
  border-radius: var(--radius); padding: 26px; font-size: 16px;
}
.quiz-result b { font-size: 30px; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.quiz-result .verdict { display: block; margin-top: 8px; color: var(--text-dim); font-size: 14px; }

/* ============================================================
   FOOTER
   ============================================================ */
.footer { border-top: 1px solid var(--border); padding: 34px 20px 44px; background: var(--bg-soft); }
.footer-inner { max-width: 1080px; margin: 0 auto; text-align: center; color: var(--text-faint); font-size: 13px; }
.footer-inner p { margin-bottom: 6px; }

/* ============================================================
   第七章 · 类与数据地图
   ============================================================ */
.map-title { margin-top: 48px; font-size: 19px; margin-bottom: 4px; }
.map-title:first-of-type { margin-top: 36px; }
.lane {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 14px 18px; margin-top: 14px;
}
.lane-label { font-size: 12px; color: var(--text-faint); letter-spacing: 1.2px; margin-bottom: 10px; }
.chain-row { display: flex; flex-wrap: wrap; gap: 9px; align-items: stretch; }
.chain-arrow { align-self: center; color: var(--text-faint); font-size: 17px; }
.node-class, .node-table { text-align: left; flex: 0 1 auto; }
.node-class .node-tag, .node-table .node-tag { margin-top: 5px; }
.node-name { font-family: var(--mono); font-size: 13.5px; font-weight: 700; display: block; }
.node-lines {
  display: inline-block; margin-top: 5px; margin-right: 6px;
  font-size: 11px; font-family: var(--mono); color: var(--accent);
  background: rgba(74, 222, 128, 0.08); border: 1px solid rgba(74, 222, 128, 0.3);
  border-radius: 6px; padding: 0 7px;
}
.node-class.active { border-color: var(--accent-2); background: rgba(56, 189, 248, 0.1); box-shadow: 0 0 0 1px var(--accent-2); }
.node-table.active { border-color: #c084fc; background: rgba(192, 132, 252, 0.1); box-shadow: 0 0 0 1px #c084fc; }

.class-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(248px, 1fr)); gap: 12px; margin-top: 18px; }
.class-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 14px 16px; cursor: pointer; text-align: left; color: var(--text);
  font-family: inherit; transition: all .18s;
}
.class-card:hover { border-color: var(--border-strong); background: var(--card-hover); transform: translateY(-2px); }
.class-card.active { border-color: var(--accent-2); box-shadow: 0 0 0 1px var(--accent-2); }
.class-card-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-bottom: 7px; flex-wrap: wrap; }
.class-card-name { font-family: var(--mono); font-size: 13.5px; font-weight: 700; }
.class-card-lines { font-size: 11px; color: var(--text-faint); font-family: var(--mono); }
.class-card-desc { font-size: 12.8px; color: var(--text-dim); line-height: 1.65; }
.layer-chip { font-size: 10.5px; padding: 1.5px 8px; border-radius: 999px; border: 1px solid; white-space: nowrap; }
.chip-controller { color: #38bdf8; border-color: rgba(56, 189, 248, 0.4); background: rgba(56, 189, 248, 0.08); }
.chip-service { color: #4ade80; border-color: rgba(74, 222, 128, 0.4); background: rgba(74, 222, 128, 0.08); }
.chip-engine { color: #c084fc; border-color: rgba(192, 132, 252, 0.4); background: rgba(192, 132, 252, 0.08); }
.chip-security { color: #fbbf24; border-color: rgba(251, 191, 36, 0.4); background: rgba(251, 191, 36, 0.08); }
.chip-frontend { color: #22d3ee; border-color: rgba(34, 211, 238, 0.4); background: rgba(34, 211, 238, 0.08); }

.er-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: stretch; margin-top: 14px; }
.er-arrow { align-self: center; color: var(--text-faint); font-size: 11.5px; line-height: 1.5; max-width: 150px; }
.er-arrow b { color: var(--accent-2); font-family: var(--mono); font-size: 12.5px; }
.domain-group { margin-top: 20px; }
.domain-name { font-size: 12px; color: var(--text-faint); letter-spacing: 1.5px; }
.domain-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 9px; }
.table-chip {
  font-family: var(--mono); font-size: 12px; color: var(--text-dim);
  background: var(--card); border: 1px solid var(--border); border-radius: 999px;
  padding: 5px 13px; cursor: pointer; transition: all .15s;
}
.table-chip:hover { color: var(--text); border-color: var(--accent-2); }
.table-chip.active { color: var(--text); border-color: #c084fc; background: rgba(192, 132, 252, 0.1); box-shadow: 0 0 0 1px #c084fc; }
.table-chip.retired { border-style: dashed; opacity: 0.65; }

/* 就地展开：面板插入网格时占满整行；锚点滚动时给吸顶导航留出高度 */
.class-grid > .detail-panel { grid-column: 1 / -1; }
.auth-grid > .detail-panel { grid-column: 1 / -1; }
.class-grid > .detail-panel, .auth-grid > .detail-panel { margin-top: 0; }
.arch-layer, .lane, .pipe-steps, .auth-col, .er-row, .domain-group, .class-grid .class-card {
  scroll-margin-top: 74px;
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 720px) {
  .hero { padding-top: 60px; }
  .auth-grid { grid-template-columns: 1fr; }
  .quiz-opts { grid-template-columns: 1fr; }
  .pipe-step { margin-right: 16px; }
  .pipe-step::after { right: -15px; }
  .code-moment { padding: 20px 18px; }
  .detail-panel { padding: 20px 18px; }
  .layer-nodes.four .inner-arrow { display: none; }
  .layer-nodes.four > .node { flex: 1 1 42%; }
}