:root {
  --primary: #0F62FE;
  --ink: #161616;
  --workbench: #F4F4F4;
  --surface: #FFFFFF;
  --text-secondary: #525252;
  --line: #C6C6C6;
  --line-strong: #8D8D8D;
  --blue-soft: #EDF5FF;
  --blue-line: #A6C8FF;
  --success: #24A148;
  --success-soft: #DEFBE6;
  --warning: #8A5A00;
  --warning-bg: #FFF8E1;
  --warning-line: #F1C21B;
  --danger: #DA1E28;
  --danger-soft: #FFF1F1;
  --danger-line: #FA4D56;
  --neutral-soft: #E0E0E0;
  --radius-control: 2px;
  --radius-card: 4px;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--workbench);
}

* { box-sizing: border-box; }
html { min-width: 320px; background: var(--workbench); }
body { min-height: 100vh; margin: 0; color: var(--ink); background: var(--workbench); font-size: 16px; line-height: 1.5; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, a:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 99; padding: 8px 12px; color: #fff; background: var(--ink); border-radius: var(--radius-control); text-decoration: none; }
.skip-link:focus { top: 16px; }

/* 结构层：深色导航 + 浅色工作区 */
.topbar { position: sticky; top: 0; z-index: 20; display: flex; min-height: 64px; align-items: center; justify-content: space-between; gap: 24px; padding: 8px 24px; color: #fff; background: var(--ink); border-bottom: 1px solid #393939; }
.brand { display: flex; min-width: 0; align-items: center; gap: 12px; }
.brand-mark { display: grid; width: 32px; height: 32px; place-items: center; color: #fff; background: var(--primary); border-radius: var(--radius-control); font-size: 18px; }
.brand strong, .brand small { display: block; }
.brand strong { font-size: 16px; font-weight: 600; }
.brand small { margin-top: 2px; color: #C6C6C6; font-size: 12px; }
.topbar-actions { display: flex; min-width: 0; align-items: center; gap: 16px; }
.topbar-context { overflow: hidden; color: #F4F4F4; font-size: 14px; text-overflow: ellipsis; white-space: nowrap; }
.offline-badge { color: #A6C8FF; font-size: 13px; white-space: nowrap; }

.app-shell { display: grid; grid-template-columns: 304px minmax(0, 1fr); min-height: calc(100vh - 64px); }
.sidebar { min-width: 0; padding: 24px 16px; color: #F4F4F4; background: var(--ink); border-right: 1px solid #393939; }
.course-meta { padding: 0 8px 24px; border-bottom: 1px solid #393939; }
.eyebrow { margin: 0 0 8px; color: #A6C8FF; font-size: 12px; font-weight: 600; letter-spacing: .08em; }
.course-meta h1 { margin: 0; color: #fff; font-size: 20px; font-weight: 600; line-height: 1.4; }
.course-meta p:not(.eyebrow) { margin: 12px 0 0; color: #C6C6C6; font-size: 14px; line-height: 1.6; }
.nav-group { padding: 20px 0 0; }
.nav-group + .nav-group { margin-top: 8px; border-top: 1px solid #393939; }
.mobile-nav-summary { display: none; }
.nav-section-heading, .panel-heading { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 0 8px; }
.nav-section-heading h2, .panel-heading h2 { margin: 0; color: #fff; font-size: 14px; font-weight: 600; }
.nav-section-heading span, .panel-heading span { color: #A6C8FF; font-size: 12px; font-weight: 600; }
.course-nav, .result-nav { display: grid; gap: 4px; padding: 12px 0 0; }
.nav-button { display: flex; width: 100%; min-height: 52px; align-items: center; gap: 10px; padding: 8px; color: #F4F4F4; background: transparent; border: 1px solid transparent; border-radius: var(--radius-control); text-align: left; }
.nav-button:hover { color: #fff; background: #262626; }
.nav-button.is-active { color: #fff; background: #393939; border-color: #525252; border-left: 4px solid var(--primary); padding-left: 5px; }
.nav-number { flex: 0 0 34px; color: #A6A6A6; font-family: var(--font-mono); font-size: 14px; font-weight: 600; }
.nav-button.is-active .nav-number { color: #fff; }
.nav-copy { display: grid; min-width: 0; flex: 1; gap: 2px; }
.nav-copy strong { overflow: hidden; color: inherit; font-size: 14px; font-weight: 600; line-height: 1.35; text-overflow: ellipsis; white-space: nowrap; }
.nav-copy small { color: #A6A6A6; font-size: 12px; line-height: 1.3; }
.nav-button.is-active .nav-copy small { color: #D0E2FF; }
.nav-button.good .nav-copy small { color: #6FDc8C; }
.nav-checkpoint { display: inline-grid; min-width: 28px; height: 22px; place-items: center; padding: 0 5px; color: #D0E2FF; background: #263D63; border: 1px solid #4589FF; border-radius: var(--radius-control); font-size: 11px; font-weight: 600; }
.nav-group-results { padding-top: 16px; }
.result-button { min-height: 46px; }

.gate-panel { padding: 20px 0 0; }
.section-helper { margin: 8px 8px 0; color: #A6A6A6; font-size: 12px; line-height: 1.5; }
.gate-list { display: grid; gap: 8px; margin-top: 12px; }
.gate-card { padding: 10px; background: #262626; border: 1px solid #525252; border-left: 3px solid #6F6F6F; border-radius: var(--radius-control); }
.gate-card.good { border-left-color: var(--success); }
.gate-card.active { border-left-color: var(--primary); }
.gate-card.danger { border-left-color: var(--danger); }
.gate-card-top { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.gate-id { display: inline-grid; min-width: 30px; height: 24px; place-items: center; padding: 0 5px; color: #D0E2FF; background: #263D63; border: 1px solid #4589FF; border-radius: var(--radius-control); font-size: 12px; font-weight: 600; }
.gate-card h3 { margin: 8px 0 4px; color: #fff; font-size: 13px; font-weight: 600; line-height: 1.45; }
.gate-card p { margin: 0; color: #C6C6C6; font-size: 12px; line-height: 1.45; }
.progress-panel { margin-top: 24px; padding: 16px 8px 0; border-top: 1px solid #393939; }
.progress-panel-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; color: #C6C6C6; font-size: 13px; }
.progress-panel-heading strong { color: #fff; font-size: 12px; font-weight: 600; }
.progress-track { width: 100%; height: 8px; margin-top: 10px; overflow: hidden; background: #393939; border-radius: 0; }
.progress-fill { display: block; height: 100%; background: var(--primary); transition: width .2s ease; }
.progress-panel p { margin: 8px 0 0; color: #8D8D8D; font-size: 12px; line-height: 1.45; }

.main-content { width: 100%; max-width: 1520px; margin: 0 auto; padding: 24px 32px 48px; }
.safety-strip { display: flex; min-height: 48px; align-items: flex-start; gap: 10px; padding: 12px 16px; color: var(--warning); background: var(--warning-bg); border: 1px solid var(--warning-line); border-left: 4px solid var(--warning-line); border-radius: var(--radius-control); font-size: 14px; line-height: 1.5; }
.safety-strip strong { color: var(--ink); }
.learning-page { padding-top: 24px; }
.page-heading { display: grid; grid-template-columns: minmax(0, 1fr) minmax(320px, .78fr); gap: 32px; align-items: start; margin: 0 0 24px; }
.page-heading-main { min-width: 0; }
.breadcrumb { margin: 0 0 12px; color: var(--text-secondary); font-size: 13px; font-weight: 600; }
.breadcrumb span { padding: 0 6px; color: var(--line-strong); }
.chapter-tag { display: inline-flex; align-items: center; padding: 4px 8px; color: var(--primary); background: var(--blue-soft); border: 1px solid var(--blue-line); border-radius: var(--radius-control); font-size: 13px; font-weight: 600; line-height: 1.4; }
.page-heading h2 { max-width: 820px; margin: 10px 0 0; color: var(--ink); font-size: clamp(24px, 2.5vw, 32px); font-weight: 600; letter-spacing: -.01em; line-height: 1.25; }
.page-description { max-width: 820px; margin: 12px 0 0; color: var(--text-secondary); line-height: 1.6; }
.page-context { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); margin: 0; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-card); }
.page-context > div { min-width: 0; padding: 12px 14px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.page-context > div:nth-child(2n) { border-right: 0; }
.page-context > div:nth-last-child(-n + 2) { border-bottom: 0; }
.page-context dt { color: var(--text-secondary); font-size: 12px; font-weight: 600; }
.page-context dd { margin: 4px 0 0; color: var(--ink); font-size: 14px; line-height: 1.45; }

.task-guide { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; margin-bottom: 24px; }
.guide-card { min-width: 0; min-height: 132px; padding: 16px; background: var(--surface); border: 1px solid var(--line); border-top: 3px solid var(--primary); border-radius: var(--radius-card); }
.guide-card h3 { margin: 0 0 8px; color: var(--ink); font-size: 16px; font-weight: 600; }
.guide-card ul { display: grid; gap: 6px; margin: 0; padding-left: 18px; color: var(--text-secondary); font-size: 13px; line-height: 1.5; }
.guide-card li::marker { color: var(--primary); }

.card { min-width: 0; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-card); }
.card-pad { padding: 24px; }
.section-gap { margin-top: 24px; }
.field-gap { margin-top: 16px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.feature-card { min-height: 132px; padding: 16px; border-left: 3px solid var(--primary); }
.feature-card h3 { margin: 0 0 8px; font-size: 16px; font-weight: 600; }
.feature-card p { margin: 0; color: var(--text-secondary); font-size: 14px; line-height: 1.55; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 16px; }
.section-heading h3 { margin: 0; font-size: 20px; font-weight: 600; }
.section-heading > p { max-width: 520px; margin: 0; color: var(--text-secondary); font-size: 14px; line-height: 1.5; }
.section-kicker { margin: 0 0 4px; color: var(--text-secondary); font-size: 12px; font-weight: 600; letter-spacing: .04em; }

/* 首页路径：01–08 与结果层级分离 */
.path-panel { padding: 24px; }
.path-flow { min-width: 0; }
.learning-path, .result-path { display: grid; grid-template-columns: repeat(8, minmax(0, 1fr)); gap: 8px; margin: 0; padding: 0; list-style: none; }
.path-step { position: relative; min-width: 0; }
.path-step:not(:last-child)::after { content: "→"; position: absolute; z-index: 1; top: 20px; right: -7px; color: var(--line-strong); font-size: 14px; font-weight: 600; }
.path-step-button { display: flex; width: 100%; min-height: 76px; align-items: flex-start; gap: 8px; padding: 10px; color: var(--ink); background: var(--workbench); border: 1px solid var(--line); border-radius: var(--radius-card); text-align: left; }
.path-step-button:hover { border-color: var(--primary); background: var(--blue-soft); }
.path-step.is-current .path-step-button { border: 2px solid var(--primary); padding: 9px; background: var(--blue-soft); }
.path-step.good .path-step-button, .result-path-item.good .path-step-button { border-left: 3px solid var(--success); }
.path-step.neutral .path-step-button, .result-path-item.neutral .path-step-button { color: var(--text-secondary); background: #E8E8E8; }
.path-number { display: inline-grid; flex: 0 0 30px; width: 30px; height: 30px; place-items: center; color: #fff; background: var(--ink); border-radius: var(--radius-control); font-family: var(--font-mono); font-size: 12px; font-weight: 600; }
.path-step.is-current .path-number { background: var(--primary); }
.path-step.good .path-number, .result-path-item.good .path-number { background: var(--success); }
.path-copy { display: grid; min-width: 0; gap: 4px; }
.path-copy strong { font-size: 14px; font-weight: 600; line-height: 1.35; }
.path-copy small { color: var(--text-secondary); font-size: 12px; line-height: 1.3; }
.path-step.is-current .path-copy small { color: var(--primary); }
.path-checkpoint { min-height: 116px; margin-top: 8px; padding: 10px; background: var(--blue-soft); border: 1px solid var(--blue-line); border-left: 3px solid var(--primary); border-radius: var(--radius-control); }
.path-checkpoint.good { border-left-color: var(--success); }
.path-checkpoint.danger { border-left-color: var(--danger); }
.path-checkpoint-head { display: flex; align-items: center; justify-content: space-between; gap: 6px; }
.path-checkpoint h4 { margin: 8px 0 4px; color: var(--ink); font-size: 13px; font-weight: 600; line-height: 1.4; }
.path-checkpoint p { margin: 3px 0 0; color: var(--text-secondary); font-size: 12px; line-height: 1.45; }
.result-path-label { display: flex; align-items: baseline; gap: 10px; margin: 24px 0 8px; padding-top: 16px; border-top: 1px solid var(--line); }
.result-path-label span { color: var(--ink); font-size: 16px; font-weight: 600; }
.result-path-label small { color: var(--text-secondary); font-size: 12px; }
.result-path { grid-template-columns: repeat(2, minmax(0, 1fr)); max-width: 420px; }
.result-path-item { min-width: 0; }
.home-command { display: flex; align-items: center; justify-content: space-between; gap: 24px; margin-top: 24px; border-left: 4px solid var(--primary); }
.home-command h3 { margin: 0 0 6px; font-size: 18px; font-weight: 600; }
.home-command p { max-width: 760px; margin: 0; color: var(--text-secondary); line-height: 1.6; }
.home-command .button-row { flex: 0 0 auto; margin-top: 0; }
.home-reference { align-self: start; }
.home-reference img { aspect-ratio: 16 / 9; object-fit: cover; }

/* 交互内容、表单与状态 */
.button { min-height: 44px; padding: 10px 16px; color: #fff; background: var(--ink); border: 1px solid transparent; border-radius: var(--radius-control); font-weight: 600; line-height: 1.35; transition: background-color .15s ease, border-color .15s ease; }
.button:hover { background: #393939; }
.button-primary { background: var(--primary); }
.button-primary:hover { background: #0353E9; }
.button-success { background: var(--success); }
.button-success:hover { background: #198038; }
.button-warning { color: var(--ink); background: var(--warning-line); }
.button-danger { background: var(--danger); }
.button-danger:hover { background: #B81922; }
.button-quiet { min-height: 36px; padding: 7px 12px; color: #F4F4F4; background: transparent; border-color: #6F6F6F; font-size: 13px; }
.button-quiet:hover { background: #393939; }
.button-ghost { color: var(--ink); background: #E0E0E0; border-color: #8D8D8D; }
.button-ghost:hover { background: #C6C6C6; }
.button[disabled] { opacity: .45; cursor: not-allowed; }
.button-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }

.callout { display: flex; align-items: flex-start; gap: 12px; padding: 16px; border: 1px solid; border-radius: var(--radius-card); line-height: 1.6; }
.callout strong { display: block; margin-bottom: 2px; }
.callout-safe { color: var(--warning); background: var(--warning-bg); border-color: var(--warning-line); }
.callout-info { color: #0043CE; background: var(--blue-soft); border-color: var(--blue-line); }
.callout-danger { color: #750E13; background: var(--danger-soft); border-color: var(--danger-line); }
.callout-icon { display: grid; flex: 0 0 28px; width: 28px; height: 28px; place-items: center; color: #fff; background: currentColor; border-radius: var(--radius-control); font-weight: 700; }
.callout-safe .callout-icon { color: var(--warning); }
.callout-info .callout-icon { color: var(--primary); }
.callout-danger .callout-icon { color: var(--danger); }
.activity-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; margin-bottom: 16px; }
.activity-head h3 { margin: 0; font-size: 18px; font-weight: 600; line-height: 1.4; }
.activity-head p { margin: 6px 0 0; color: var(--text-secondary); line-height: 1.55; }
.score-pill { display: inline-flex; flex: 0 0 auto; align-items: center; min-height: 28px; padding: 4px 8px; color: var(--primary); background: var(--blue-soft); border: 1px solid var(--blue-line); border-radius: var(--radius-control); font-size: 12px; font-weight: 600; white-space: nowrap; }
.choice-grid { display: grid; gap: 8px; }
.choice { display: flex; min-height: 50px; align-items: flex-start; gap: 10px; padding: 12px; color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-control); line-height: 1.5; }
.choice:hover { background: var(--blue-soft); border-color: var(--primary); }
.choice input { flex: 0 0 auto; margin-top: 4px; accent-color: var(--primary); }
.choice.is-danger { color: #750E13; background: var(--danger-soft); border-color: var(--danger-line); }
.feedback { display: none; margin-top: 16px; padding: 12px 14px; border: 1px solid; border-radius: var(--radius-card); line-height: 1.6; }
.feedback.is-visible { display: block; }
.feedback.good { color: #0E6027; background: var(--success-soft); border-color: var(--success); }
.feedback.warn { color: var(--warning); background: var(--warning-bg); border-color: var(--warning-line); }
.feedback.bad { color: #750E13; background: var(--danger-soft); border-color: var(--danger-line); }
.feedback.info { color: #0043CE; background: var(--blue-soft); border-color: var(--blue-line); }
.feedback strong { display: block; }
.check-list { display: grid; gap: 8px; }
.check-row { display: flex; align-items: flex-start; gap: 10px; padding: 12px; color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-control); line-height: 1.55; }
.check-row input { flex: 0 0 auto; width: 17px; height: 17px; margin-top: 4px; accent-color: var(--primary); }
.mission-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 16px; align-items: start; }
.image-card { overflow: hidden; padding: 0; }
.image-card img { display: block; width: 100%; height: auto; }
.image-card figcaption { padding: 12px 16px; color: var(--text-secondary); font-size: 13px; line-height: 1.5; }
.task-steps { display: grid; gap: 12px; margin: 0; padding: 0; counter-reset: step; }
.task-steps li { position: relative; padding-left: 40px; color: var(--text-secondary); list-style: none; line-height: 1.55; }
.task-steps li::before { content: counter(step); counter-increment: step; position: absolute; top: 0; left: 0; display: grid; width: 26px; height: 26px; place-items: center; color: #fff; background: var(--primary); border-radius: var(--radius-control); font-size: 12px; font-weight: 600; }
.option-cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }
.option-card { min-height: 140px; padding: 16px; color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-control); text-align: left; }
.option-card strong, .option-card span { display: block; }
.option-card strong { margin-bottom: 6px; font-size: 16px; font-weight: 600; }
.option-card span { color: var(--text-secondary); font-size: 14px; line-height: 1.55; }
.option-card:hover, .option-card.is-selected { background: var(--blue-soft); border-color: var(--primary); }
.option-card.is-selected { box-shadow: inset 0 0 0 1px var(--primary); }
.option-card.is-danger { color: #750E13; background: var(--danger-soft); border-color: var(--danger-line); }
.option-card.is-review { border-color: var(--warning-line); }
.list-order { display: grid; gap: 8px; margin: 0; padding: 0; list-style: none; }
.order-row { display: grid; grid-template-columns: 32px minmax(0, 1fr) auto auto; min-height: 50px; align-items: center; gap: 8px; padding: 8px 10px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-control); }
.order-number { display: grid; width: 26px; height: 26px; place-items: center; color: #fff; background: var(--ink); border-radius: var(--radius-control); font-family: var(--font-mono); font-size: 12px; font-weight: 600; }
.order-row span:nth-child(2) { line-height: 1.45; }
.move-button { width: 32px; height: 32px; color: var(--ink); background: var(--workbench); border: 1px solid var(--line); border-radius: var(--radius-control); font-weight: 600; }
.move-button:hover { color: var(--primary); border-color: var(--primary); }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.form-field { display: grid; gap: 6px; min-width: 0; }
.form-field.full { grid-column: 1 / -1; }
.form-field label { color: var(--ink); font-size: 14px; font-weight: 600; }
.form-field input, .form-field select, .form-field textarea { width: 100%; padding: 10px 12px; color: var(--ink); background: var(--surface); border: 1px solid var(--line-strong); border-radius: var(--radius-control); }
.form-field input:focus, .form-field select:focus, .form-field textarea:focus { border-color: var(--primary); }
.form-field textarea { min-height: 102px; resize: vertical; line-height: 1.55; }
.form-help { margin: 0; color: var(--text-secondary); font-size: 13px; line-height: 1.5; }
.motor-table { width: 100%; border-collapse: collapse; border: 1px solid var(--line); }
.motor-table th, .motor-table td { padding: 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; font-size: 14px; }
.motor-table th { color: var(--text-secondary); background: var(--workbench); font-size: 13px; font-weight: 600; }
.motor-table tr:last-child td { border-bottom: 0; }
.motor-table select { width: 100%; min-width: 132px; padding: 7px; color: var(--ink); background: var(--surface); border: 1px solid var(--line-strong); border-radius: var(--radius-control); }

/* 检查点与结果 */
.checkpoint-bar { display: grid; grid-template-columns: 56px minmax(0, 1fr) minmax(240px, .65fr); gap: 16px; align-items: start; margin-top: 24px; padding: 20px; background: var(--blue-soft); border: 1px solid var(--blue-line); border-left: 5px solid var(--primary); border-radius: var(--radius-card); }
.checkpoint-bar.good { background: var(--success-soft); border-color: var(--success); border-left-color: var(--success); }
.checkpoint-bar.danger { color: #750E13; background: var(--danger-soft); border-color: var(--danger-line); border-left-color: var(--danger); }
.checkpoint-marker { display: grid; width: 48px; height: 48px; place-items: center; color: #fff; background: var(--primary); border-radius: var(--radius-control); font-family: var(--font-mono); font-size: 16px; font-weight: 600; }
.checkpoint-bar.good .checkpoint-marker { background: var(--success); }
.checkpoint-bar.danger .checkpoint-marker { background: var(--danger); }
.checkpoint-copy h3 { margin: 0 0 4px; font-size: 18px; font-weight: 600; }
.checkpoint-copy p, .checkpoint-meta p { margin: 4px 0 0; color: var(--text-secondary); font-size: 14px; line-height: 1.5; }
.checkpoint-meta { min-width: 0; padding-left: 16px; border-left: 1px solid currentColor; }
.checkpoint-meta p { font-size: 13px; }
.checkpoint-meta strong { color: var(--ink); }
.status-token { display: inline-flex; align-items: center; min-height: 24px; padding: 3px 7px; color: var(--text-secondary); background: var(--neutral-soft); border: 1px solid var(--line); border-radius: var(--radius-control); font-size: 12px; font-weight: 600; line-height: 1.3; white-space: nowrap; }
.status-token.good, .status-chip.good { color: #0E6027; background: var(--success-soft); border-color: var(--success); }
.status-token.warn, .status-chip.warn { color: var(--warning); background: var(--warning-bg); border-color: var(--warning-line); }
.status-token.danger, .status-chip.danger { color: #750E13; background: var(--danger-soft); border-color: var(--danger-line); }
.status-token.active { color: #0043CE; background: var(--blue-soft); border-color: var(--blue-line); }
.status-chip { display: inline-flex; align-items: center; min-height: 24px; padding: 3px 7px; color: var(--text-secondary); background: var(--neutral-soft); border: 1px solid var(--line); border-radius: var(--radius-control); font-size: 12px; font-weight: 600; }
.report-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 16px; }
.score-board { padding: 24px; color: #fff; background: var(--ink); border-color: var(--ink); }
.score-board p { color: #C6C6C6; }
.score-total { margin: 6px 0 0; color: #A6C8FF; font-size: 56px; line-height: 1; letter-spacing: -.03em; }
.score-total small { color: #C6C6C6; font-size: 18px; letter-spacing: 0; }
.evidence-list { display: grid; gap: 0; margin: 16px 0 0; padding: 0; list-style: none; }
.evidence-list li { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; padding: 10px 0; color: var(--text-secondary); border-bottom: 1px solid var(--line); font-size: 14px; }
.score-board .evidence-list li { color: #C6C6C6; border-bottom-color: #525252; }
.evidence-list li b { color: var(--ink); font-weight: 600; text-align: right; }
.score-board .evidence-list li b { color: #fff; }

/* 锁定页、安全对话框与反馈 */
.locked-overlay::after { display: none; }
.locked-state { display: grid; grid-template-columns: 48px minmax(0, 1fr); gap: 16px; align-items: start; max-width: 760px; margin: 0 auto; padding: 16px 0; }
.locked-mark { display: grid; width: 40px; height: 40px; place-items: center; color: #fff; background: var(--ink); border-radius: var(--radius-control); font-size: 20px; font-weight: 600; }
.locked-state h3 { margin: 0; font-size: 20px; font-weight: 600; line-height: 1.4; }
.locked-state p { margin: 8px 0 0; color: var(--text-secondary); line-height: 1.6; }
.locked-state ol { display: grid; gap: 6px; margin: 16px 0 0; padding-left: 20px; color: var(--text-secondary); }
.locked-state strong { color: var(--ink); }
.empty-state { padding: 32px; color: var(--text-secondary); text-align: center; }
.toast { position: fixed; right: 24px; bottom: 24px; z-index: 50; max-width: 360px; padding: 12px 16px; color: #fff; background: var(--ink); border: 1px solid #525252; border-radius: var(--radius-control); transform: translateY(140%); transition: transform .2s ease; line-height: 1.5; }
.toast.is-visible { transform: translateY(0); }
.dialog { width: min(520px, calc(100vw - 32px)); padding: 24px; color: var(--ink); background: var(--surface); border: 1px solid var(--danger-line); border-radius: var(--radius-card); box-shadow: 0 16px 48px rgba(0, 0, 0, .28); }
.dialog::backdrop { background: rgba(22, 22, 22, .72); }
.dialog-icon { display: grid; width: 40px; height: 40px; margin-bottom: 12px; place-items: center; color: #fff; background: var(--danger); border-radius: var(--radius-control); font-size: 22px; font-weight: 700; }
.dialog h2 { margin: 0 0 10px; font-size: 22px; font-weight: 600; }
.dialog p { color: var(--text-secondary); line-height: 1.6; }
.dialog .check-row { margin: 16px 0; }

/* 装配工坊 */
.assembly-layout, .gs-layout { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr); gap: 16px; align-items: start; }
.assembly-stage { padding: 20px; }
.assembly-stage-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; margin-bottom: 14px; }
.assembly-stage-head h3 { margin: 0; font-size: 18px; font-weight: 600; }
.assembly-stage-head p { margin: 6px 0 0; color: var(--text-secondary); font-size: 13px; line-height: 1.5; }
.assembly-pending { margin: 0 0 12px; padding: 10px 12px; color: #0043CE; background: var(--blue-soft); border: 1px solid var(--blue-line); border-radius: var(--radius-control); font-size: 14px; }
.assembly-svg { display: block; width: 100%; height: auto; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-control); }
.asm-arm { stroke: #C6C6C6; stroke-width: 30; stroke-linecap: round; }
.asm-plate { fill: var(--ink); stroke: var(--primary); stroke-width: 2; }
.asm-plate-label { fill: #C6C6C6; font-size: 12px; font-weight: 600; }
.asm-pos-label { fill: var(--text-secondary); font-size: 15px; font-weight: 600; }
.asm-slot-base { fill: var(--surface); stroke: var(--line-strong); stroke-width: 1.5; }
.asm-motor-bell { fill: var(--workbench); stroke: var(--line-strong); stroke-width: 1.5; }
.asm-slot-label { fill: var(--text-secondary); font-size: 10px; font-weight: 600; }
.asm-part-glyph { pointer-events: none; }
.assembly-slot { cursor: pointer; }
.assembly-slot:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.assembly-slot.is-legal .asm-slot-base, .assembly-slot.is-legal .asm-motor-bell { fill: var(--blue-soft); stroke: var(--primary); stroke-width: 3; }
.assembly-slot.is-installed .asm-slot-base { stroke: var(--success); stroke-width: 2.5; }
.asm-line { fill: none; stroke-width: 2.5; stroke-linecap: round; }
.asm-line.signal, .asm-line.power { stroke: var(--primary); }
.asm-line.signal { stroke-dasharray: 5 4; }
.asm-nose-arrow { stroke: var(--ink); stroke-width: 3; }
.asm-nose-head { fill: var(--ink); }
.asm-nose-label { fill: var(--text-secondary); font-size: 12px; font-weight: 600; }
.assembly-parts { padding: 18px; }
.assembly-parts-head { margin-bottom: 14px; }
.assembly-parts-head h3 { margin: 0; font-size: 18px; font-weight: 600; }
.assembly-parts-head p { margin: 6px 0 0; color: var(--text-secondary); font-size: 13px; line-height: 1.5; }
.assembly-parts-grid, .part-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.part-button { display: flex; min-width: 0; flex-direction: column; align-items: flex-start; gap: 6px; padding: 10px; color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-control); text-align: left; }
.part-button .part-icon { flex: 0 0 40px; width: 40px; height: 40px; }
.part-button .part-text { display: flex; min-width: 0; flex-direction: column; gap: 2px; }
.part-button .part-text > span, .part-button b { font-size: 13px; font-weight: 600; line-height: 1.35; }
.part-button .part-text em { color: var(--success); font-size: 11px; font-style: normal; }
.part-button:hover { background: var(--blue-soft); border-color: var(--primary); }
.part-button.is-selected { background: var(--blue-soft); border-color: var(--primary); box-shadow: inset 0 0 0 1px var(--primary); }
.part-button.is-installed { opacity: .55; }
.part-button.is-prop { color: #750E13; background: var(--danger-soft); border-color: var(--danger-line); }
.part-button.is-prop .part-text em { color: var(--danger); }
.part-button:disabled { cursor: default; }
.part-button:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.assembly-frame { padding: 8px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-control); }
.assembly-frame svg { display: block; max-width: 560px; margin: 0 auto; }

/* 地面站模拟 */
.gs-statusbar { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; padding: 10px 12px; background: var(--workbench); border: 1px solid var(--line); border-radius: var(--radius-control); }
.gs-status { padding: 4px 8px; color: var(--text-secondary); background: var(--neutral-soft); border: 1px solid var(--line); border-radius: var(--radius-control); font-size: 12px; font-weight: 600; }
.gs-status.is-on { color: #0E6027; background: var(--success-soft); border-color: var(--success); }
.gs-actions { display: grid; gap: 8px; }
.gs-step { display: flex; min-height: 48px; align-items: center; gap: 10px; padding: 9px 12px; color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-control); text-align: left; line-height: 1.4; }
.gs-step:hover { border-color: var(--primary); background: var(--blue-soft); }
.gs-step-num { display: grid; flex: 0 0 28px; width: 28px; height: 28px; place-items: center; color: #fff; background: var(--ink); border-radius: var(--radius-control); font-family: var(--font-mono); font-size: 12px; font-weight: 600; }
.gs-step em { margin-left: auto; color: var(--success); font-size: 12px; font-style: normal; font-weight: 600; }
.gs-step.is-next { border-color: var(--primary); background: var(--blue-soft); }
.gs-step.is-done { opacity: .62; }
.gs-step.is-done .gs-step-num { background: var(--success); }
.gs-step:disabled { cursor: not-allowed; }
.gs-log { min-height: 150px; margin-top: 14px; padding: 12px; overflow: auto; color: #A7F0BA; background: #262626; border: 1px solid #525252; border-radius: var(--radius-control); font-family: var(--font-mono); font-size: 12px; line-height: 1.65; }
.gs-log p { margin: 0; }
.gs-log-empty { color: #8D8D8D; }

/* 故障诊断、题库 */
.diagnosis-steps { display: grid; gap: 8px; margin-top: 24px; }
.diagnosis-step { padding: 16px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-card); }
.diagnosis-step h4 { margin: 0 0 10px; font-size: 16px; font-weight: 600; }
.tabs { display: flex; gap: 8px; overflow-x: auto; margin-bottom: 14px; padding-bottom: 4px; }
.tab-button { padding: 8px 12px; color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-control); font-size: 13px; font-weight: 600; white-space: nowrap; }
.tab-button:hover, .tab-button.is-active { color: #fff; background: var(--primary); border-color: var(--primary); }
.quiz-card { padding: 24px; }
.quiz-meta { display: flex; justify-content: space-between; gap: 12px; color: var(--text-secondary); font-size: 13px; }
.quiz-card h3 { margin: 16px 0; font-size: 20px; font-weight: 600; line-height: 1.5; }
.quiz-options { display: grid; gap: 8px; }
.quiz-option { display: flex; gap: 10px; align-items: flex-start; padding: 12px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-control); line-height: 1.55; }
.quiz-option:hover { background: var(--blue-soft); border-color: var(--primary); }
.quiz-option input { margin-top: 4px; accent-color: var(--primary); }
.quiz-pagination { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-top: 18px; }

@media (max-width: 1120px) {
  .app-shell { grid-template-columns: 272px minmax(0, 1fr); }
  .main-content { padding-right: 24px; padding-left: 24px; }
  .page-heading { grid-template-columns: 1fr; gap: 16px; }
  .page-context { max-width: 760px; }
  .learning-path, .result-path { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .path-step:nth-child(4)::after { display: none; }
  .task-guide { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 820px) {
  .topbar { align-items: flex-start; padding: 10px 16px; }
  .topbar-actions { gap: 10px; }
  .topbar-context { max-width: 190px; }
  .app-shell { display: block; }
  .sidebar { padding: 16px; border-right: 0; border-bottom: 1px solid #393939; }
  .course-meta { padding: 0 0 16px; }
  .course-meta p:not(.eyebrow) { display: none; }
  .mobile-nav-shell { margin-top: 12px; }
  .mobile-nav-summary { display: flex; min-height: 44px; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 12px; color: #F4F4F4; background: #262626; border: 1px solid #525252; border-left: 3px solid var(--primary); border-radius: var(--radius-control); cursor: pointer; font-size: 13px; font-weight: 600; }
  .mobile-nav-summary span:last-child { color: #A6C8FF; font-size: 12px; font-weight: 400; }
  .mobile-nav-shell:not([open]) > :not(summary) { display: none; }
  .mobile-nav-shell[open] > :not(summary) { display: block; }
  .nav-group { padding-top: 16px; }
  .nav-group + .nav-group { margin-top: 4px; }
  .course-nav, .result-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 4px; }
  .nav-button { min-height: 50px; }
  .gate-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .progress-panel { margin-top: 16px; }
  .main-content { padding: 16px 16px 32px; }
  .learning-page { padding-top: 16px; }
  .grid-2, .grid-3, .mission-grid, .report-grid, .assembly-layout, .gs-layout { grid-template-columns: 1fr; }
  .option-cards { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .form-field.full { grid-column: auto; }
  .checkpoint-bar { grid-template-columns: 48px minmax(0, 1fr); }
  .checkpoint-meta { grid-column: 1 / -1; padding: 12px 0 0; border-top: 1px solid var(--line); border-left: 0; }
  .home-command { display: block; }
  .home-command .button-row { margin-top: 16px; }
  .motor-table { display: block; overflow-x: auto; white-space: nowrap; }
}

@media (min-width: 821px) {
  .mobile-nav-shell { display: block; }
  .mobile-nav-shell > .mobile-nav-summary { display: none; }
  .mobile-nav-shell:not([open]) > :not(summary) { display: block !important; }
}

@media (max-width: 560px) {
  .topbar { gap: 8px; }
  .brand strong { font-size: 14px; }
  .brand small, .offline-badge { display: none; }
  .topbar-context { max-width: 160px; font-size: 12px; }
  .button-quiet { padding: 7px 9px; font-size: 12px; }
  .safety-strip { font-size: 13px; }
  .card-pad, .quiz-card, .path-panel { padding: 16px; }
  .page-heading h2 { font-size: 24px; }
  .page-context { grid-template-columns: 1fr; }
  .page-context > div, .page-context > div:nth-child(2n), .page-context > div:nth-last-child(-n + 2) { border-right: 0; border-bottom: 1px solid var(--line); }
  .page-context > div:last-child { border-bottom: 0; }
  .task-guide { grid-template-columns: 1fr; gap: 8px; }
  .guide-card { min-height: 0; }
  .learning-path { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .learning-path .path-step::after { display: none; }
  .result-path { grid-template-columns: 1fr; }
  .section-heading { display: block; }
  .section-heading > p { margin-top: 8px; }
  .activity-head { display: block; }
  .score-pill { margin-top: 8px; }
  .gate-list, .course-nav, .result-nav { grid-template-columns: 1fr; }
  .checkpoint-bar { grid-template-columns: 1fr; }
  .checkpoint-meta { grid-column: auto; }
  .checkpoint-marker { width: 40px; height: 40px; }
  .quiz-meta, .quiz-pagination { align-items: flex-start; flex-direction: column; }
  .button-row .button { flex: 1 1 auto; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
}