:root {
  /* Typography */
  --font-sans: "Inter", "Poppins", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-heading: "Inter", "Poppins", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --fs-100: 0.75rem;
  --fs-200: 0.875rem;
  --fs-300: 1rem;
  --fs-400: 1.125rem;
  --fs-500: 1.25rem;
  --fs-600: 1.5rem;
  --fs-700: 2rem;
  --fs-800: 2.5rem;

  --lh-tight: 1.2;
  --lh-heading: 1.3;
  --lh-base: 1.6;

  /* 8pt Spacing System */
  --space-0: 0;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 2.5rem;
  --space-6: 3rem;
  --space-7: 3.5rem;
  --space-8: 4rem;
  --space-9: 4.5rem;
  --space-10: 5rem;

  /* Radius Scale */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-pill: 999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-sm: 0 8px 20px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 16px 32px rgba(15, 23, 42, 0.12);
  --shadow-lg: 0 24px 56px rgba(15, 23, 42, 0.16);

  /* Motion */
  --transition-fast: 160ms ease;
  --transition-base: 240ms ease;

  /* Adults (default) palette */
  --color-bg: #f5f7fb;
  --color-surface: #ffffff;
  --color-surface-soft: #eef3ff;
  --color-border: #d8e2f0;
  --color-text: #1f2a37;
  --color-text-muted: #66758d;
  --color-brand: #1f4bd9;
  --color-brand-strong: #1639a8;
  --color-accent: #00a7c4;

  /* Semantic colors */
  --color-success: #138a58;
  --color-warning: #b06d12;
  --color-danger: #c63b3b;
  --color-info: #2370e5;

  /* UI semantic tokens */
  --card-bg: var(--color-surface);
  --card-border: var(--color-border);
  --muted-text: var(--color-text-muted);

  --progress-track: #dde6f8;
  --progress-fill: linear-gradient(90deg, #2f6af3, #00a7c4);

  --badge-bg: #e6efff;
  --badge-text: #1a3e9d;
  --badge-success-bg: #e8f8f0;
  --badge-success-text: #0d7c4d;
  --badge-warning-bg: #fff4dc;
  --badge-warning-text: #8f5800;
  --badge-danger-bg: #ffe9e9;
  --badge-danger-text: #a92a2a;

  --btn-primary-bg: var(--color-brand);
  --btn-primary-text: #ffffff;
  --btn-primary-bg-hover: var(--color-brand-strong);

  --btn-secondary-bg: #ffffff;
  --btn-secondary-text: var(--color-brand);
  --btn-secondary-border: var(--color-border);

  --btn-ghost-bg: transparent;
  --btn-ghost-text: var(--color-text);
  --btn-ghost-border: var(--color-border);
}

/* Kids palette */
body.segment-kids {
  --color-bg: #f7fbff;
  --color-surface: #ffffff;
  --color-surface-soft: #e6f7ff;
  --color-border: #cae8f8;
  --color-text: #1c3552;
  --color-text-muted: #4f7397;
  --color-brand: #1c86e3;
  --color-brand-strong: #145ea0;
  --color-accent: #32c184;

  --color-success: #1f9b61;
  --color-warning: #c17a13;
  --color-danger: #d24a4a;
  --color-info: #1f86e3;

  --progress-track: #d6eefb;
  --progress-fill: linear-gradient(90deg, #1c86e3, #32c184);

  --badge-bg: #dff2ff;
  --badge-text: #13548c;
}

/* Teens palette */
body.segment-teens {
  --color-bg: #f4f6ff;
  --color-surface: #ffffff;
  --color-surface-soft: #edf0ff;
  --color-border: #d8ddf8;
  --color-text: #24263d;
  --color-text-muted: #646a8f;
  --color-brand: #5f49ea;
  --color-brand-strong: #4937b8;
  --color-accent: #ff6d9d;

  --color-success: #2f9159;
  --color-warning: #a86f20;
  --color-danger: #bd345d;
  --color-info: #4f6ef5;

  --progress-track: #e2e5ff;
  --progress-fill: linear-gradient(90deg, #5f49ea, #ff6d9d);

  --badge-bg: #ece9ff;
  --badge-text: #4332a4;
}

/* Adults palette (explicit) */
body.segment-adults {
  --color-bg: #f5f7fb;
  --color-surface: #ffffff;
  --color-surface-soft: #eef3ff;
  --color-border: #d8e2f0;
  --color-text: #1f2a37;
  --color-text-muted: #66758d;
  --color-brand: #1f4bd9;
  --color-brand-strong: #1639a8;
  --color-accent: #00a7c4;
}

/* Dark mode placeholders: Teens */
body.segment-teens.theme-dark {
  --color-bg: #161928;
  --color-surface: #1f2335;
  --color-surface-soft: #292f45;
  --color-border: #343b55;
  --color-text: #ebf0ff;
  --color-text-muted: #a6afcf;
  --color-brand: #8f82ff;
  --color-brand-strong: #b4acff;
  --color-accent: #ff8bb2;

  --card-bg: var(--color-surface);
  --progress-track: #323b57;
  --badge-bg: #2b3150;
  --badge-text: #c8d0ff;
  --btn-secondary-bg: #1d2338;
  --btn-secondary-text: #e2e7ff;
  --btn-secondary-border: #3f4966;
}

/* Dark mode placeholders: Adults */
body.segment-adults.theme-dark {
  --color-bg: #101722;
  --color-surface: #172231;
  --color-surface-soft: #1f2d3f;
  --color-border: #2f3d51;
  --color-text: #e6eef9;
  --color-text-muted: #9db0c8;
  --color-brand: #7ca7ff;
  --color-brand-strong: #9dbdff;
  --color-accent: #3ac6dc;

  --card-bg: var(--color-surface);
  --progress-track: #2c3d52;
  --badge-bg: #22354d;
  --badge-text: #c6dbff;
  --btn-secondary-bg: #172335;
  --btn-secondary-text: #e6eef9;
  --btn-secondary-border: #34465e;
}

/* Kids intentionally stays light by default */
body.segment-kids.theme-dark {
  --color-bg: #f7fbff;
}

.page-container {
  width: min(1200px, calc(100% - (var(--space-4))));
  margin-inline: auto;
}

.section {
  padding-block: var(--space-6);
}

.section--sm {
  padding-block: var(--space-4);
}

.section--lg {
  padding-block: var(--space-8);
}

.section-title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: clamp(var(--fs-500), 2.8vw, var(--fs-700));
  line-height: var(--lh-heading);
}

.section-subtitle {
  margin: 0;
  color: var(--muted-text);
  max-width: 64ch;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
  padding: var(--space-3);
}

.card--elevated {
  box-shadow: var(--shadow-sm);
}

.card--interactive {
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.card--interactive:hover,
.card--interactive:focus-within {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: color-mix(in srgb, var(--color-brand) 32%, var(--color-border));
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  min-height: 42px;
  padding: 0 var(--space-2);
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  cursor: pointer;
  font-size: var(--fs-200);
  font-weight: 600;
  line-height: 1;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.btn:hover,
.btn:focus {
  transform: translateY(-1px);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
}

.btn-primary:hover,
.btn-primary:focus {
  background: var(--btn-primary-bg-hover);
  color: var(--btn-primary-text);
}

.btn-secondary {
  background: var(--btn-secondary-bg);
  color: var(--btn-secondary-text);
  border-color: var(--btn-secondary-border);
}

.btn-ghost {
  background: var(--btn-ghost-bg);
  color: var(--btn-ghost-text);
  border-color: var(--btn-ghost-border);
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 24px;
  padding-inline: 0.625rem;
  border-radius: var(--radius-pill);
  background: var(--badge-bg);
  color: var(--badge-text);
  font-size: var(--fs-100);
  font-weight: 700;
}

.badge--success {
  background: var(--badge-success-bg);
  color: var(--badge-success-text);
}

.badge--warning {
  background: var(--badge-warning-bg);
  color: var(--badge-warning-text);
}

.badge--danger {
  background: var(--badge-danger-bg);
  color: var(--badge-danger-text);
}

.progress {
  width: 100%;
  height: 0.625rem;
  border-radius: var(--radius-pill);
  overflow: hidden;
  background: var(--progress-track);
}

.progress__bar {
  width: var(--progress-value, 0%);
  height: 100%;
  background: var(--progress-fill);
  transition: width var(--transition-base);
}

/* AI-ready placeholders */
.recorder-button {
  --recorder-glow: rgba(239, 68, 68, 0.28);
  position: relative;
}

.recorder-button.is-idle {
  background: var(--btn-secondary-bg);
  color: var(--btn-secondary-text);
  border-color: var(--btn-secondary-border);
}

.recorder-button.is-recording {
  background: #ef4444;
  color: #ffffff;
  border-color: #ef4444;
  box-shadow: 0 0 0 0.45rem var(--recorder-glow);
}

.recorder-button.is-processing {
  background: #f59e0b;
  color: #1f2937;
  border-color: #f59e0b;
}

.ai-feedback-panel {
  border: 1px solid color-mix(in srgb, var(--color-brand) 28%, var(--color-border));
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--color-surface) 90%, var(--color-brand) 10%);
  padding: var(--space-3);
}

.ai-feedback-panel__title {
  margin: 0 0 var(--space-1);
  font-size: var(--fs-400);
  font-weight: 700;
}

.ai-feedback-panel__meta {
  margin: 0 0 var(--space-2);
  font-size: var(--fs-100);
  color: var(--muted-text);
}

.ai-feedback-panel__score-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: var(--space-1);
}

.trophy-room-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-2);
}

.trophy-room-card {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  background: linear-gradient(140deg, color-mix(in srgb, var(--color-brand) 8%, var(--color-surface)), var(--color-surface));
  padding: var(--space-3);
}

.trophy-room-card::after {
  content: "";
  position: absolute;
  top: -30%;
  right: -15%;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--color-accent) 20%, transparent);
  z-index: -1;
}

.text-muted {
  color: var(--muted-text);
}

.surface-soft {
  background: var(--color-surface-soft);
}