/* =========================================================
   Learning Rewired Lab
   Branching Diagnostic Coach
   Design Lab Detail Page
   File: /assets/css/branching-diagnostic-coach.css
   ========================================================= */

:root {
  --bdc-ink: #f8fbff;
  --bdc-muted: rgba(226, 232, 240, 0.76);
  --bdc-soft: rgba(255, 255, 255, 0.08);
  --bdc-line: rgba(148, 163, 184, 0.22);
  --bdc-deep: #050816;
  --bdc-navy: #07111f;
  --bdc-panel: rgba(10, 24, 42, 0.82);
  --bdc-panel-strong: rgba(12, 28, 50, 0.96);
  --bdc-cyan: #66e3ff;
  --bdc-lime: #b9ff7a;
  --bdc-gold: #ffd36e;
  --bdc-pink: #ff87c8;
  --bdc-shadow: 0 26px 80px rgba(0, 0, 0, 0.34);
  --bdc-radius-xl: 34px;
  --bdc-radius-lg: 26px;
  --bdc-radius-md: 18px;
  --bdc-max: 1180px;
  --bdc-font: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--bdc-ink);
  font-family: var(--bdc-font);
  background:
    radial-gradient(circle at top left, rgba(102, 227, 255, 0.16), transparent 32rem),
    radial-gradient(circle at 76% 10%, rgba(185, 255, 122, 0.12), transparent 28rem),
    radial-gradient(circle at 30% 90%, rgba(255, 135, 200, 0.1), transparent 28rem),
    linear-gradient(135deg, #040813 0%, #071321 45%, #0b1f2d 100%);
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.92), transparent 84%);
}

a {
  color: inherit;
}

button,
input,
select,
textarea {
  font: inherit;
}

.site-shell {
  position: relative;
  z-index: 1;
}

.ac-resource-page {
  position: relative;
  z-index: 1;
  padding: 1.25rem 0 5rem;
}

.ac-resource-inner {
  width: min(var(--bdc-max), calc(100% - 32px));
  margin: 0 auto;
}

/* =========================================================
   Breadcrumbs
   ========================================================= */

.ac-resource-breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem;
  margin: 1.25rem 0 1.5rem;
  color: var(--bdc-muted);
  font-size: 0.9rem;
}

.ac-resource-breadcrumbs a {
  text-decoration: none;
  color: rgba(248, 251, 255, 0.76);
}

.ac-resource-breadcrumbs a:hover {
  color: var(--bdc-cyan);
}

.ac-resource-breadcrumbs strong {
  color: var(--bdc-ink);
}

/* =========================================================
   Hero
   ========================================================= */

.ac-resource-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(2rem, 5vw, 4rem);
  border: 1px solid var(--bdc-line);
  border-radius: var(--bdc-radius-xl);
  background:
    radial-gradient(circle at top left, rgba(102, 227, 255, 0.18), transparent 36%),
    radial-gradient(circle at bottom right, rgba(185, 255, 122, 0.12), transparent 32%),
    linear-gradient(145deg, rgba(12, 28, 50, 0.94), rgba(6, 17, 31, 0.88));
  box-shadow: var(--bdc-shadow);
}

.ac-resource-hero::after {
  content: "";
  position: absolute;
  width: 340px;
  height: 340px;
  right: -140px;
  top: -140px;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(102, 227, 255, 0.22), transparent 68%);
  pointer-events: none;
}

.ac-eyebrow,
.ac-card-label,
.bdc-kicker {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  gap: 0.5rem;
  margin: 0 0 1rem;
  padding: 0.48rem 0.72rem;
  border: 1px solid rgba(102, 227, 255, 0.28);
  border-radius: 999px;
  background: rgba(102, 227, 255, 0.11);
  color: #dffaff;
  font-size: 0.74rem;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.ac-resource-hero h1 {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0;
  font-size: clamp(3rem, 8vw, 6.4rem);
  line-height: 0.9;
  letter-spacing: -0.075em;
}

.ac-resource-hero h1 span {
  color: var(--bdc-cyan);
}

.ac-hero-intro {
  position: relative;
  z-index: 1;
  max-width: 850px;
  margin: 1.25rem 0 0;
  color: var(--bdc-muted);
  font-size: clamp(1.02rem, 1.8vw, 1.22rem);
  line-height: 1.7;
}

.ac-hero-actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.75rem;
}

/* =========================================================
   Buttons
   ========================================================= */

.ac-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0.8rem 1.05rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 900;
  line-height: 1;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    border-color 0.2s ease,
    background 0.2s ease;
}

.ac-btn:hover {
  transform: translateY(-2px);
}

.ac-btn.primary {
  color: #071321;
  background: linear-gradient(135deg, var(--bdc-cyan), var(--bdc-lime));
  box-shadow: 0 16px 34px rgba(102, 227, 255, 0.18);
}

.ac-btn.secondary {
  color: var(--bdc-ink);
  border: 1px solid var(--bdc-line);
  background: rgba(255, 255, 255, 0.075);
}

/* =========================================================
   Shared Sections
   ========================================================= */

.ac-section {
  margin-top: clamp(1.5rem, 4vw, 2.4rem);
}

.ac-section-heading {
  margin-bottom: 1rem;
}

.ac-section-heading.compact {
  margin-bottom: 0;
}

.ac-section-heading h2,
.ac-feature-band h2,
.ac-info-card h2,
.ac-resource-cta h2 {
  margin: 0;
  color: var(--bdc-ink);
  font-size: clamp(1.65rem, 3vw, 2.55rem);
  line-height: 1.05;
  letter-spacing: -0.05em;
}

.ac-section-heading p:not(.ac-eyebrow),
.ac-feature-band p,
.ac-info-card p,
.ac-resource-cta p {
  max-width: 760px;
  margin: 0.85rem 0 0;
  color: var(--bdc-muted);
  line-height: 1.65;
}

/* =========================================================
   Overview Cards
   ========================================================= */

.ac-overview-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.75fr) minmax(0, 0.9fr);
  gap: 1rem;
}

.ac-info-card,
.ac-feature-band,
.ac-code-card,
.ac-resource-cta {
  border: 1px solid var(--bdc-line);
  border-radius: var(--bdc-radius-lg);
  background: var(--bdc-panel);
  box-shadow: 0 20px 56px rgba(0, 0, 0, 0.24);
  backdrop-filter: blur(16px);
}

.ac-info-card {
  padding: clamp(1.2rem, 3vw, 1.65rem);
}

.ac-info-card ul,
.ac-process-grid ul {
  margin: 0.85rem 0 0;
  padding-left: 1.1rem;
  color: var(--bdc-muted);
  line-height: 1.7;
}

.ac-info-card li + li {
  margin-top: 0.35rem;
}

/* =========================================================
   Live Preview
   ========================================================= */

.bdc-demo {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: 1rem;
  align-items: start;
}

.bdc-workspace,
.bdc-coach-panel {
  border: 1px solid var(--bdc-line);
  border-radius: var(--bdc-radius-lg);
  background: rgba(10, 24, 42, 0.78);
  box-shadow: 0 20px 56px rgba(0, 0, 0, 0.24);
  backdrop-filter: blur(16px);
}

.bdc-workspace {
  display: grid;
  gap: 1rem;
  padding: clamp(1rem, 3vw, 1.3rem);
}

.bdc-case-card,
.bdc-step-card {
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.06);
  padding: 1.15rem;
}

.bdc-case-card h3 {
  margin: 0;
  font-size: clamp(1.25rem, 2.4vw, 1.75rem);
  line-height: 1.12;
  letter-spacing: -0.045em;
}

.bdc-case-card p:not(.bdc-kicker) {
  margin: 0.8rem 0 0;
  color: var(--bdc-muted);
  line-height: 1.6;
}

.bdc-step-card {
  transition:
    opacity 0.2s ease,
    transform 0.2s ease,
    border-color 0.2s ease;
}

.bdc-step-card.is-disabled {
  opacity: 0.5;
}

.bdc-step-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.8rem;
}

.bdc-step-heading span {
  color: var(--bdc-cyan);
  font-size: 0.74rem;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.bdc-step-heading h4 {
  margin: 0;
  font-size: 1.1rem;
  letter-spacing: -0.025em;
}

.bdc-option-grid {
  display: grid;
  gap: 0.75rem;
}

.bdc-option-grid button {
  width: 100%;
  cursor: pointer;
  text-align: left;
  color: var(--bdc-ink);
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.07);
  padding: 1rem;
  transition:
    transform 0.2s ease,
    border-color 0.2s ease,
    background 0.2s ease,
    box-shadow 0.2s ease;
}

.bdc-option-grid button:hover {
  transform: translateY(-2px);
  border-color: rgba(102, 227, 255, 0.42);
  background: rgba(102, 227, 255, 0.1);
}

.bdc-option-grid button.is-selected,
.bdc-option-grid button[aria-pressed="true"] {
  border-color: rgba(185, 255, 122, 0.54);
  background: rgba(185, 255, 122, 0.11);
  box-shadow: inset 0 0 0 1px rgba(185, 255, 122, 0.12);
}

.bdc-option-grid strong {
  display: block;
  font-size: 1rem;
}

.bdc-option-grid span {
  display: block;
  margin-top: 0.35rem;
  color: var(--bdc-muted);
  font-size: 0.92rem;
  line-height: 1.45;
}

/* Coach panel */

.bdc-coach-panel {
  position: sticky;
  top: 96px;
  padding: clamp(1rem, 3vw, 1.25rem);
}

.bdc-panel-header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 1rem;
}

.bdc-panel-header span {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  max-width: 180px;
  padding: 0.45rem 0.65rem;
  border: 1px solid rgba(185, 255, 122, 0.28);
  border-radius: 999px;
  background: rgba(185, 255, 122, 0.12);
  color: #ecffc8;
  font-size: 0.72rem;
  font-weight: 900;
  line-height: 1.25;
  text-transform: uppercase;
}

.bdc-signal-meter {
  display: grid;
  gap: 0.7rem;
  margin: 1rem 0;
}

.bdc-signal-meter div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.85rem;
  padding: 0.8rem;
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.055);
}

.bdc-signal-meter span {
  color: var(--bdc-muted);
  font-size: 0.86rem;
  font-weight: 800;
}

.bdc-signal-meter b {
  color: var(--bdc-cyan);
  font-size: 1rem;
}

.bdc-feedback,
.bdc-next-step {
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 20px;
  background: rgba(0, 0, 0, 0.2);
  padding: 1rem;
}

.bdc-feedback h3 {
  margin: 0;
  font-size: 1.25rem;
  letter-spacing: -0.04em;
}

.bdc-feedback p,
.bdc-next-step p {
  margin: 0.6rem 0 0;
  color: var(--bdc-muted);
  line-height: 1.55;
}

.bdc-next-step {
  margin-top: 0.85rem;
}

.bdc-next-step span {
  color: var(--bdc-gold);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* =========================================================
   Feature Band
   ========================================================= */

.ac-feature-band {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(1rem, 4vw, 2rem);
  align-items: center;
  padding: clamp(1.2rem, 3vw, 1.75rem);
  background:
    radial-gradient(circle at top left, rgba(102, 227, 255, 0.16), transparent 36%),
    linear-gradient(145deg, rgba(10, 24, 42, 0.88), rgba(6, 17, 31, 0.82));
}

/* =========================================================
   Two Column / Code
   ========================================================= */

.ac-two-column {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 1rem;
  align-items: start;
}

.ac-two-column.reverse {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.ac-code-card {
  overflow: hidden;
  background: rgba(3, 8, 18, 0.88);
}

.ac-code-card pre {
  margin: 0;
  max-height: 680px;
  overflow: auto;
  padding: clamp(1rem, 3vw, 1.35rem);
}

.ac-code-card code {
  color: rgba(226, 232, 240, 0.92);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.86rem;
  line-height: 1.65;
  white-space: pre;
}

.ac-code-card.small-code pre {
  max-height: none;
}

/* =========================================================
   Process
   ========================================================= */

.ac-process-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.ac-process-grid article {
  padding: 1.15rem;
  border: 1px solid var(--bdc-line);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.06);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.18);
}

.ac-process-grid span {
  display: inline-flex;
  margin-bottom: 0.75rem;
  color: var(--bdc-cyan);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.ac-process-grid h3 {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.ac-process-grid p {
  margin: 0.65rem 0 0;
  color: var(--bdc-muted);
  font-size: 0.92rem;
  line-height: 1.55;
}

/* =========================================================
   CTA
   ========================================================= */

.ac-resource-cta {
  margin-top: clamp(2rem, 5vw, 3.5rem);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  text-align: center;
  background:
    radial-gradient(circle at top left, rgba(102, 227, 255, 0.18), transparent 34%),
    radial-gradient(circle at bottom right, rgba(185, 255, 122, 0.12), transparent 34%),
    linear-gradient(145deg, rgba(12, 28, 50, 0.92), rgba(6, 17, 31, 0.9));
}

.ac-resource-cta .ac-eyebrow {
  margin-inline: auto;
}

.ac-resource-cta p {
  margin-left: auto;
  margin-right: auto;
}

.ac-resource-cta .ac-btn {
  margin-top: 1.25rem;
}

/* =========================================================
   Responsive
   ========================================================= */

@media (max-width: 980px) {
  .ac-overview-grid,
  .bdc-demo,
  .ac-feature-band,
  .ac-two-column,
  .ac-two-column.reverse {
    grid-template-columns: 1fr;
  }

  .bdc-coach-panel {
    position: static;
  }

  .ac-process-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .ac-resource-inner {
    width: min(100% - 22px, var(--bdc-max));
  }

  .ac-resource-page {
    padding-top: 0.75rem;
  }

  .ac-resource-hero {
    padding: 1.35rem;
    border-radius: 26px;
  }

  .ac-resource-hero h1 {
    font-size: clamp(2.65rem, 14vw, 4rem);
  }

  .ac-hero-actions,
  .ac-resource-cta .ac-btn {
    width: 100%;
  }

  .ac-btn {
    width: 100%;
  }

  .bdc-step-heading,
  .bdc-panel-header {
    flex-direction: column;
    align-items: start;
  }

  .ac-process-grid {
    grid-template-columns: 1fr;
  }

  .ac-code-card pre {
    max-height: 520px;
  }
}

/* =========================================================
   v2 LIGHT EDITORIAL MIGRATION
   ---------------------------------------------------------
   This page shipped as a self-contained DARK theme (its own
   dark body, --bdc-ink near-white, dark glass panels). Every
   sibling Design Lab page is now light, and the shared shell
   leaked dark --dld-ink onto the un-colored hero h1, so the
   title went dark-on-dark. Convert the whole page to the light
   system: remap tokens, light body + surfaces, darken pill
   labels. The .ac-code-card stays dark (light code text).
   ========================================================= */
:root {
  --bdc-ink: #0f172a;
  --bdc-muted: #475569;
  --bdc-soft: rgba(15, 23, 42, 0.05);
  --bdc-line: rgba(15, 23, 42, 0.10);
  --bdc-panel: #ffffff;
  --bdc-panel-strong: #ffffff;
  --bdc-cyan: #0e7490;
  --bdc-shadow: 0 18px 44px rgba(15, 23, 42, 0.08);
}

body {
  color: var(--bdc-ink);
  background:
    radial-gradient(circle at top left, rgba(102, 227, 255, 0.07), transparent 34rem),
    radial-gradient(circle at 76% 10%, rgba(185, 255, 122, 0.05), transparent 30rem),
    #ffffff;
}

body::before {
  mask-image: none;
  background-image:
    linear-gradient(rgba(15, 23, 42, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 23, 42, 0.028) 1px, transparent 1px);
}

/* hero / feature / cta → light tints */
.ac-resource-hero {
  background:
    radial-gradient(circle at top left, rgba(102, 227, 255, 0.10), transparent 38%),
    radial-gradient(circle at bottom right, rgba(185, 255, 122, 0.07), transparent 34%),
    #ffffff;
  box-shadow: 0 18px 44px rgba(15, 23, 42, 0.08);
}

.ac-resource-hero::after {
  opacity: 0.45;
}

.ac-feature-band {
  background:
    radial-gradient(circle at top left, rgba(102, 227, 255, 0.09), transparent 38%),
    #f8fafc;
}

.ac-resource-cta {
  background:
    radial-gradient(circle at top left, rgba(102, 227, 255, 0.10), transparent 36%),
    radial-gradient(circle at bottom right, rgba(185, 255, 122, 0.07), transparent 36%),
    #ffffff;
  box-shadow: 0 18px 44px rgba(15, 23, 42, 0.08);
}

.ac-resource-hero h1 {
  color: var(--bdc-ink);
}

.ac-resource-hero h1 span {
  color: #0e7490;
}

/* glass panels → solid light */
.ac-info-card,
.ac-process-grid article {
  background: #ffffff;
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.06);
}

.bdc-workspace,
.bdc-coach-panel {
  background: #f8fafc;
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.06);
}

.bdc-case-card,
.bdc-step-card,
.bdc-option-grid button {
  background: #ffffff;
}

.bdc-signal-meter div,
.bdc-feedback,
.bdc-next-step {
  background: #f1f5f9;
}

.ac-btn.secondary {
  background: #ffffff;
}

.ac-btn.primary {
  background: linear-gradient(135deg, #22d3ee, #a3e635);
  color: #071321;
  box-shadow: 0 12px 28px rgba(34, 211, 238, 0.22);
}

.bdc-option-grid button:hover {
  background: #eef6ff;
  border-color: rgba(37, 99, 235, 0.35);
}

.bdc-option-grid button.is-selected,
.bdc-option-grid button[aria-pressed="true"] {
  background: #ecfdf3;
  border-color: rgba(21, 128, 61, 0.42);
  box-shadow: inset 0 0 0 1px rgba(21, 128, 61, 0.14);
}

/* pill labels: near-white text → readable dark */
.ac-eyebrow,
.ac-card-label,
.bdc-kicker {
  color: #0e7490;
  background: rgba(14, 116, 144, 0.08);
  border-color: rgba(14, 116, 144, 0.22);
}

.bdc-panel-header span {
  color: #3f6212;
  background: rgba(132, 204, 22, 0.14);
  border-color: rgba(132, 204, 22, 0.34);
}

.ac-resource-breadcrumbs a {
  color: #475569;
}

.bdc-next-step span {
  color: #b45309;
}