/* Hallmark · genre: editorial · macrostructure: Workbench · theme: Garden recalibrated · enrichment: real read-only iframe + generated training scenes · nav: N9 · footer: Ft2 · contrast: pass (40–41) · slop: pass (42–45; 58-gate sweep) · honest: pass (46) · chrome: pass (47) · tokens: pass (48) · responsive: pass (49) · icons: pass (30) · mobile: pass (34, 49, 50–57) */
/* Hallmark · pre-emit critique: P5 H5 E5 S5 R5 V5 */
*, *::before, *::after { box-sizing: border-box; }

html,
body {
  overflow-x: clip;
}

html {
  color-scheme: light;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.68;
  text-rendering: optimizeLegibility;
}

a,
button {
  color: inherit;
  font: inherit;
}

a { text-decoration-thickness: var(--rule-thin); text-underline-offset: 0.28em; }

button { border-radius: 0; }

img,
iframe { display: block; max-width: 100%; }

h1,
h2,
h3,
p { margin: 0; }

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-style: normal;
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.16;
  overflow-wrap: anywhere;
  min-width: 0;
}

.skip-link {
  position: fixed;
  inset-block-start: var(--space-xs);
  inset-inline-start: var(--space-xs);
  z-index: var(--z-sticky);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-ink);
  color: var(--color-paper);
  transform: translateY(-160%);
}

.skip-link:focus { transform: none; }

.shell {
  width: min(100% - 2rem, 88rem);
  margin-inline: auto;
}

.nav-edge {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  min-height: 5rem;
  border-block-end: var(--rule-thin) solid var(--color-rule);
}

.wordmark {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.nav-action,
.button,
.route-tab {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding-inline: var(--space-md);
  border: var(--rule-thin) solid var(--color-rule-strong);
  background: var(--color-paper);
  color: var(--color-accent-deep);
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color var(--dur-short) var(--ease-out), color var(--dur-short) var(--ease-out), transform var(--dur-micro) var(--ease-out);
}

.button--primary {
  background: var(--color-accent-deep);
  color: var(--color-accent-ink);
  border-color: var(--color-accent-deep);
}

.hero-split {
  display: grid;
  gap: var(--space-2xl);
  padding-block: var(--space-2xl) var(--space-3xl);
  border-block-end: var(--rule-thin) solid var(--color-rule);
}

.hero-copy {
  display: grid;
  align-content: start;
  gap: var(--space-lg);
}

.kicker {
  color: var(--color-accent-deep);
  font-size: var(--text-sm);
  font-weight: 800;
  letter-spacing: 0.08em;
}

.hero-copy h1 {
  max-width: none;
  font-size: clamp(2.5rem, 3.5vw, 3.75rem);
  line-height: 1.08;
}

.lede {
  max-width: 34rem;
  color: var(--color-muted);
  font-size: var(--text-md);
}

.boundary-note {
  max-width: 64ch;
  padding-inline-start: var(--space-md);
  border-inline-start: var(--rule-strong) solid var(--color-accent);
  color: var(--color-ink-2);
  font-size: var(--text-sm);
}

.hero-visual,
.usage-visual {
  display: grid;
  gap: var(--space-xs);
  margin: 0;
  min-width: 0;
}

.visual-frame {
  overflow: clip;
  min-width: 0;
  border: var(--rule-thin) solid var(--color-rule);
  background: var(--color-paper-2);
  border-radius: var(--radius-sm);
}

.visual-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-visual .visual-frame {
  height: clamp(11rem, 16vw, 13.5rem);
}

.hero-visual figcaption,
.usage-visual figcaption {
  max-width: 72ch;
  color: var(--color-muted);
  font-size: var(--text-sm);
}

.decision-panel {
  align-self: start;
  display: grid;
  margin-block-start: var(--space-2xl);
  background: var(--color-panel-surface);
  color: var(--color-ink);
  border: var(--rule-thin) solid var(--color-rule);
  border-block-start: var(--rule-strong) solid var(--color-accent);
  border-radius: var(--radius-sm);
}

.decision-panel header {
  display: grid;
  gap: var(--space-xs);
  padding: var(--space-lg);
  border-block-end: var(--rule-thin) solid var(--color-rule);
}

.decision-panel h2 { font-size: var(--text-xl); }

.decision-panel p { color: var(--color-muted); }

.decision-options { display: grid; }

.decision-option {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-lg);
  align-items: start;
  padding: var(--space-lg);
  color: var(--color-ink);
  text-decoration: none;
  border-block-end: var(--rule-thin) solid var(--color-rule);
}

.decision-option:last-child { border-block-end: 0; }

.decision-index {
  color: var(--color-accent-deep);
  font-variant-numeric: tabular-nums;
  font-weight: 800;
}

.decision-option strong { display: block; font-size: var(--text-md); }
.decision-option span:last-child { display: block; color: var(--color-muted); }

.section {
  padding-block: var(--space-3xl);
  border-block-end: var(--rule-thin) solid var(--color-rule);
}

.section-head {
  display: grid;
  gap: var(--space-sm);
  max-width: 47rem;
  margin-block-end: var(--space-2xl);
}

.section-head h2 { font-size: clamp(2rem, 4vw, var(--text-3xl)); }
.section-head p { color: var(--color-muted); font-size: var(--text-md); }

.comparison {
  border-block-start: var(--rule-strong) solid var(--color-ink);
}

.comparison-row {
  display: grid;
  gap: var(--space-md);
  padding-block: var(--space-lg);
  border-block-end: var(--rule-thin) solid var(--color-rule);
}

.comparison-row h3 { font-size: var(--text-lg); }
.comparison-label { color: var(--color-muted); font-size: var(--text-sm); }
.comparison-value { color: var(--color-ink-2); }
.comparison-sequence { color: var(--color-accent-deep); font-weight: 800; font-variant-numeric: tabular-nums; }

.steps {
  display: grid;
  gap: var(--space-xl);
  margin: 0;
  padding: 0;
  list-style: none;
}

.step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-lg);
  align-items: start;
}

.stage {
  display: grid;
  width: 3.25rem;
  aspect-ratio: 1;
  place-items: center;
  border: var(--rule-thin) solid var(--color-rule-strong);
  color: var(--color-accent-deep);
  font-variant-numeric: tabular-nums;
  font-weight: 800;
}

.step-copy { display: grid; gap: var(--space-xs); }
.step h3 { font-size: var(--text-lg); }
.step p { color: var(--color-muted); max-width: 64ch; }

.workbench {
  display: grid;
  gap: var(--space-lg);
}

.workbench-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.route-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.route-tab {
  cursor: pointer;
}

.route-tab[aria-pressed="true"] {
  background: var(--color-accent-deep);
  color: var(--color-accent-ink);
  border-color: var(--color-accent-deep);
}

.route-tab[disabled],
.route-tab.is-disabled {
  opacity: 0.55;
  cursor: not-allowed;
  color: var(--color-disabled);
}

.route-tab.is-loading::after { content: " · 加载中"; }
.route-tab.is-error { border-color: var(--color-error); }
.route-tab.is-error::after { content: " · 重试"; }
.route-tab.is-success::after { content: " · 已载入"; color: var(--color-success); }

.workbench-meta {
  display: grid;
  gap: var(--space-xs);
}

.workbench-meta strong { font-family: var(--font-display); font-size: var(--text-lg); }
.workbench-meta p { color: var(--color-muted); }

.frame-shell {
  position: relative;
  min-width: 0;
  border: var(--rule-thin) solid var(--color-rule-strong);
  background: var(--color-paper-2);
}

.training-frame {
  width: 100%;
  height: min(72dvh, 46rem);
  border: 0;
  background: var(--color-paper-2);
}

.frame-status {
  min-height: 1.5rem;
  color: var(--color-muted);
  font-size: var(--text-sm);
}

.usage-grid {
  display: grid;
  gap: var(--space-xl);
}

.usage-visual {
  margin-block-end: var(--space-2xl);
}

.usage-visual .visual-frame {
  aspect-ratio: 1920 / 819;
}

.usage-item {
  display: grid;
  gap: var(--space-xs);
  padding-block-start: var(--space-md);
  border-block-start: var(--rule-thin) solid var(--color-rule-strong);
}

.usage-item h3 { font-size: var(--text-md); }
.usage-item p { color: var(--color-muted); }

.foot-line {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-md);
  padding-block: var(--space-xl);
  color: var(--color-muted);
  font-size: var(--text-sm);
}

:focus-visible {
  outline: var(--rule-strong) solid var(--color-focus);
  outline-offset: var(--space-2xs);
}

@media (hover: hover) and (pointer: fine) {
  .nav-action:hover,
  .button:hover,
  .route-tab:hover {
    background: var(--color-ink);
    color: var(--color-paper);
    transform: translateY(-1px);
  }

  .decision-option:hover {
    background: var(--color-accent-soft);
  }
}

.nav-action:active,
.button:active,
.route-tab:active { transform: translateY(1px); }

@media (min-width: 40rem) {
  .shell { width: min(100% - 3rem, 88rem); }
  .usage-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 60rem) {
  .hero-split { grid-template-columns: minmax(0, 8fr) minmax(22rem, 4fr); align-items: center; }
  .hero-copy h1 { white-space: nowrap; }
  .comparison-row { grid-template-columns: minmax(12rem, 1.4fr) minmax(8rem, 1fr) minmax(10rem, 1.15fr) minmax(7rem, 0.65fr); align-items: start; }
  .usage-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (pointer: coarse) {
  .nav-action,
  .button,
  .route-tab,
  .decision-option { min-height: 3rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: var(--dur-micro) !important;
    animation-iteration-count: 1 !important;
    transition-duration: var(--dur-micro) !important;
  }
}