/* ============================================
   CalcHeaven Design System
   Shared tokens + reusable components.
   Extends css/styles.css — preserve brand identity.
   Docs: /docs/design-system.md
   ============================================ */

:root {
  /* ——— Color (semantic extensions of brand palette) ——— */
  --ch-color-primary: var(--color-primary);
  --ch-color-primary-hover: var(--color-primary-hover);
  --ch-color-primary-soft: var(--color-primary-soft);
  --ch-color-accent: var(--color-accent);
  --ch-color-accent-soft: var(--color-accent-soft);
  --ch-color-bg: var(--color-bg);
  --ch-color-surface: var(--color-surface);
  --ch-color-text: var(--color-text);
  --ch-color-text-secondary: var(--color-text-secondary);
  --ch-color-text-muted: var(--color-text-muted);
  --ch-color-border: var(--color-border);
  --ch-color-border-strong: var(--color-border-strong);
  --ch-color-danger: var(--color-danger);
  --ch-color-danger-soft: #fef2f2;
  --ch-color-warning: var(--color-warning);
  --ch-color-warning-soft: #fff7ed;
  --ch-color-warning-text: #9a3412;
  --ch-color-success: #16a34a;
  --ch-color-success-soft: var(--color-accent-soft);
  --ch-color-info-soft: var(--color-primary-soft);
  --ch-color-focus-ring: rgba(37, 99, 235, 0.28);
  --ch-color-star: #ca8a04;

  /* ——— Typography scale ——— */
  --ch-font-sans: var(--font-sans);
  --ch-font-display: var(--font-display);
  --ch-text-xs: 0.75rem;
  --ch-text-sm: 0.875rem;
  --ch-text-md: 1rem;
  --ch-text-lg: 1.0625rem;
  --ch-text-xl: 1.25rem;
  --ch-text-2xl: 1.5rem;
  --ch-text-3xl: clamp(1.55rem, 2.6vw, 2rem);
  --ch-text-4xl: clamp(1.85rem, 3.2vw, 2.5rem);
  --ch-leading-tight: 1.2;
  --ch-leading-snug: 1.35;
  --ch-leading-normal: 1.6;
  --ch-tracking-tight: -0.025em;
  --ch-tracking-label: 0.05em;

  /* ——— Spacing scale (4px base) ——— */
  --ch-space-0: 0;
  --ch-space-1: 0.25rem;   /* 4 */
  --ch-space-2: 0.5rem;    /* 8 */
  --ch-space-3: 0.75rem;   /* 12 */
  --ch-space-4: 1rem;      /* 16 */
  --ch-space-5: 1.25rem;   /* 20 */
  --ch-space-6: 1.5rem;    /* 24 */
  --ch-space-7: 1.75rem;   /* 28 */
  --ch-space-8: 2rem;      /* 32 */
  --ch-space-10: 2.5rem;   /* 40 */
  --ch-space-12: 3rem;     /* 48 */
  --ch-space-16: 4rem;     /* 64 */

  /* ——— Radius / elevation ——— */
  --ch-radius-sm: var(--radius-sm);
  --ch-radius-md: 14px;
  --ch-radius-lg: 18px;
  --ch-radius-xl: 28px;
  --ch-radius-pill: 999px;
  --ch-shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05);
  --ch-shadow-md: 0 6px 22px rgba(15, 23, 42, 0.07);
  --ch-shadow-lg: 0 14px 44px rgba(15, 23, 42, 0.09);
  --ch-shadow-focus: var(--shadow-focus);
  --ch-shadow-hover: 0 10px 28px rgba(15, 23, 42, 0.09);

  /* ——— Motion ——— */
  --ch-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ch-duration-fast: 160ms;
  --ch-duration: var(--transition);
  --ch-duration-slow: var(--transition-slow);

  /* ——— Layout / breakpoints ——— */
  --ch-container: var(--container);
  --ch-z-tooltip: 40;
  --ch-z-sticky: 50;
  --ch-touch-min: 44px;
  --ch-bp-sm: 640px;
  --ch-bp-md: 800px;
  --ch-bp-lg: 900px;
  --ch-bp-xl: 1160px;

  /* ——— Component spacing ——— */
  --ch-card-pad: var(--ch-space-5);
  --ch-card-pad-lg: var(--ch-space-6);
  --ch-card-gap: var(--ch-space-4);
  --ch-form-gap: var(--ch-space-4);
  --ch-grid-gap: var(--ch-space-4);
  --ch-icon-sm: 1.75rem;
  --ch-icon-md: 2.5rem;
  --ch-icon-lg: 3rem;
  --ch-btn-h-sm: 2.25rem;
  --ch-btn-h-md: var(--ch-touch-min);
  --ch-btn-h-lg: 3rem;
}

/* ========== Focus / a11y baseline ========== */
:focus {
  outline: none;
}
:focus-visible {
  outline: 2px solid var(--ch-color-primary);
  outline-offset: 2px;
  box-shadow: 0 0 0 3px var(--ch-color-focus-ring);
}
.btn:focus-visible,
.ch-input:focus-visible,
.ai-assume-location-input:focus-visible,
.ai-assume-input:focus-visible {
  outline: 2px solid var(--ch-color-primary);
  outline-offset: 2px;
  box-shadow: var(--ch-shadow-focus);
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ========== Typography ========== */
.ch-display {
  font-family: var(--ch-font-display);
  font-size: var(--ch-text-4xl);
  font-weight: 800;
  letter-spacing: var(--ch-tracking-tight);
  line-height: var(--ch-leading-tight);
  color: var(--ch-color-text);
}
.ch-title {
  font-family: var(--ch-font-display);
  font-size: var(--ch-text-3xl);
  font-weight: 800;
  letter-spacing: var(--ch-tracking-tight);
  line-height: var(--ch-leading-tight);
  color: var(--ch-color-text);
}
.ch-subtitle {
  font-size: var(--ch-text-lg);
  line-height: var(--ch-leading-normal);
  color: var(--ch-color-text-secondary);
}
.ch-body {
  font-size: var(--ch-text-md);
  line-height: var(--ch-leading-normal);
  color: var(--ch-color-text-secondary);
}
.ch-caption {
  font-size: var(--ch-text-sm);
  color: var(--ch-color-text-muted);
  line-height: var(--ch-leading-snug);
}
.ch-label {
  display: inline-block;
  font-size: var(--ch-text-xs);
  font-weight: 700;
  letter-spacing: var(--ch-tracking-label);
  text-transform: uppercase;
  color: var(--ch-color-primary);
}
.ch-metric-value {
  font-size: clamp(1.45rem, 2.5vw, 2rem);
  font-weight: 800;
  letter-spacing: var(--ch-tracking-tight);
  line-height: 1.1;
  color: var(--ch-color-text);
}

/* ========== Layout helpers ========== */
.ch-stack {
  display: grid;
  gap: var(--ch-space-4);
}
.ch-stack--sm { gap: var(--ch-space-2); }
.ch-stack--lg { gap: var(--ch-space-6); }
.ch-cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--ch-space-3);
  align-items: center;
}
.ch-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--ch-space-4);
}
.ch-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--ch-space-3);
}
@media (max-width: 800px) {
  .ch-grid-2,
  .ch-grid-3 {
    grid-template-columns: 1fr;
  }
}

/* ========== Icons ========== */
.ch-icon {
  display: inline-grid;
  place-content: center;
  flex: 0 0 auto;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--ch-radius-md);
  background: var(--ch-color-primary-soft);
  color: var(--ch-color-primary);
  font-size: 1.1rem;
  line-height: 1;
}
.ch-icon--sm {
  width: 1.75rem;
  height: 1.75rem;
  font-size: 0.9rem;
  border-radius: var(--ch-radius-sm);
}
.ch-icon--lg {
  width: 3rem;
  height: 3rem;
  font-size: 1.25rem;
}
.ch-icon--ghost {
  background: transparent;
  color: var(--ch-color-primary);
}
.ch-icon svg {
  width: 1em;
  height: 1em;
}

/* ========== Button system ========== */
.btn {
  position: relative;
  min-height: var(--ch-btn-h-md);
}
.btn-sm,
.btn-md.btn-sm {
  min-height: var(--ch-btn-h-sm);
  padding: 0.625rem 1rem;
  font-size: var(--ch-text-sm);
}
.btn-md {
  min-height: var(--ch-btn-h-md);
}
.btn-lg {
  min-height: var(--ch-btn-h-lg);
  padding: 0.95rem 1.65rem;
  font-size: 1rem;
}
.btn-outline {
  background: transparent;
  color: var(--ch-color-primary);
  border: 1px solid rgba(37, 99, 235, 0.35);
  box-shadow: none;
}
.btn-outline:hover {
  background: var(--ch-color-primary-soft);
  border-color: var(--ch-color-primary);
}
.btn-danger {
  background: var(--ch-color-danger);
  color: #fff;
  box-shadow: 0 1px 2px rgba(239, 68, 68, 0.25);
}
.btn-danger:hover {
  background: #dc2626;
}
.btn-success {
  background: var(--ch-color-success);
  color: #fff;
}
.btn-success:hover {
  background: #15803d;
}
.btn-ai {
  background: linear-gradient(135deg, var(--ch-color-primary), #3b82f6);
  color: #fff;
  box-shadow: 0 1px 2px rgba(37, 99, 235, 0.28);
}
.btn-ai:hover {
  background: linear-gradient(135deg, var(--ch-color-primary-hover), var(--ch-color-primary));
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.28);
}
.btn:disabled,
.btn[disabled],
.btn.is-disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
  pointer-events: none;
}
.btn.is-loading,
.btn-loading {
  color: transparent !important;
  pointer-events: none;
}
.btn.is-loading::after,
.btn-loading::after {
  content: "";
  position: absolute;
  width: 1.1rem;
  height: 1.1rem;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: #fff;
  animation: chSpin 0.7s linear infinite;
}
.btn-secondary.is-loading::after,
.btn-outline.is-loading::after,
.btn-ghost.is-loading::after {
  border-color: rgba(37, 99, 235, 0.2);
  border-top-color: var(--ch-color-primary);
}
.ch-btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--ch-space-3);
}
.ch-btn-row .btn {
  flex: 1 1 10rem;
}

/* ========== Card library ========== */
.ch-card {
  background: var(--ch-color-surface);
  border: 1px solid var(--ch-color-border);
  border-radius: var(--ch-radius-xl);
  box-shadow: var(--ch-shadow-sm);
  padding: var(--ch-card-pad);
}
.ch-card--pad-lg {
  padding: var(--ch-card-pad-lg);
}
.ch-card--elevated {
  box-shadow: var(--ch-shadow-md);
}
.ch-card--accent,
.ch-card--ai-summary,
.ch-card--report {
  border-color: rgba(37, 99, 235, 0.16);
  position: relative;
  overflow: hidden;
}
.ch-card--accent::before,
.ch-card--ai-summary::before,
.ch-card--report::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--ch-color-primary), #60a5fa);
}
.ch-card--interactive,
.ch-card--ai-assumption,
.ch-card--guide,
.ch-card--faq,
.ch-card--comparison {
  transition: border-color var(--ch-duration) var(--ch-ease),
    box-shadow var(--ch-duration) var(--ch-ease),
    transform var(--ch-duration) var(--ch-ease);
}
.ch-card--interactive:hover,
.ch-card--ai-assumption:hover,
.ch-card--guide:hover,
.ch-card--faq:hover,
.ch-card--comparison:hover {
  border-color: rgba(37, 99, 235, 0.28);
  box-shadow: var(--ch-shadow-hover);
  transform: translateY(-2px);
}
.ch-card--metric {
  background: var(--ch-color-bg);
  border-radius: var(--ch-radius-md);
  padding: var(--ch-space-4) var(--ch-space-5);
}
.ch-card--ai-insight,
.ch-card--ai-recommend {
  display: flex;
  gap: var(--ch-space-3);
  align-items: flex-start;
}
.ch-card--ai-warning {
  border-color: rgba(37, 99, 235, 0.16);
  background: var(--ch-color-info-soft);
}
.ch-card--checklist {
  background: var(--ch-color-bg);
}
.ch-card--success {
  border-color: rgba(34, 197, 94, 0.28);
  background: var(--ch-color-success-soft);
}
.ch-card--empty {
  border-style: dashed;
  text-align: center;
  padding: var(--ch-space-10) var(--ch-space-6);
}

/* ========== AI components ========== */
.ch-ai-insight,
.ch-ai-recommendation,
.ch-ai-recommend {
  display: flex;
  gap: var(--ch-space-3);
  align-items: flex-start;
  padding: var(--ch-space-4) var(--ch-space-5);
  border-radius: var(--ch-radius-xl);
  background: var(--ch-color-surface);
  border: 1px solid var(--ch-color-border);
  box-shadow: var(--ch-shadow-sm);
}
.ch-ai-recommend,
.ch-ai-recommendation {
  border-radius: var(--ch-radius-md);
  background: var(--ch-color-bg);
  box-shadow: none;
}
.ch-ai-insight p,
.ch-ai-recommend p,
.ch-ai-recommendation p {
  margin: 0;
  color: var(--ch-color-text-secondary);
  line-height: var(--ch-leading-normal);
  font-size: 0.95rem;
}
.ch-ai-recommend h5,
.ch-ai-recommendation h5 {
  margin: 0 0 var(--ch-space-1);
  font-size: 0.98rem;
  color: var(--ch-color-text);
}
.ch-ai-warning {
  margin: 0;
  padding: 0.85rem 1rem;
  border-radius: var(--ch-radius-md);
  font-size: 0.9rem;
  line-height: 1.5;
  border: 1px solid transparent;
}
.ch-ai-warning--info,
.ch-ai-warning.is-info {
  background: var(--ch-color-info-soft);
  border-color: rgba(37, 99, 235, 0.16);
  color: var(--ch-color-text-secondary);
}
.ch-ai-warning--warn,
.ch-ai-warning.is-warn {
  background: var(--ch-color-warning-soft);
  border-color: rgba(234, 88, 12, 0.2);
  color: var(--ch-color-warning-text);
}
.ch-ai-warning--danger {
  background: var(--ch-color-danger-soft);
  border-color: rgba(239, 68, 68, 0.25);
  color: #991b1b;
}
.ch-ai-summary {
  display: grid;
  gap: var(--ch-space-4);
}
.ch-ai-confidence {
  display: grid;
  gap: var(--ch-space-1);
}
.ch-ai-confidence__stars {
  color: var(--ch-color-star);
  letter-spacing: 0.08em;
  font-size: 1rem;
  font-weight: 700;
}
.ch-ai-advisor {
  display: grid;
  gap: var(--ch-space-6);
}
.ch-ai-timeline,
.ch-ai-action-plan {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--ch-space-3);
}
.ch-ai-timeline__item,
.ch-ai-action-plan__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--ch-space-3);
  align-items: start;
  padding: var(--ch-space-3) var(--ch-space-4);
  border: 1px solid var(--ch-color-border);
  border-radius: var(--ch-radius-md);
  background: var(--ch-color-surface);
}
.ch-ai-timeline__dot {
  width: 0.65rem;
  height: 0.65rem;
  margin-top: 0.45rem;
  border-radius: 50%;
  background: var(--ch-color-primary);
  box-shadow: 0 0 0 4px var(--ch-color-primary-soft);
}

/* ========== AI Advisor Cards (BUILD 2.1) ========== */
.ch-advisor-panel {
  display: grid;
  gap: var(--ch-space-4);
  margin-top: var(--ch-space-5);
}
.ch-advisor-panel__head {
  display: grid;
  gap: var(--ch-space-1);
}
.ch-advisor-panel__title {
  margin: 0;
  font-size: var(--ch-text-xl);
  letter-spacing: var(--ch-tracking-tight);
  line-height: var(--ch-leading-tight);
}
.ch-advisor-grid {
  display: grid;
  gap: var(--ch-space-4);
}
.ch-advisor-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--ch-space-4);
  align-items: start;
  padding: var(--ch-space-5) var(--ch-space-5);
  border-radius: var(--ch-radius-xl);
  border: 1px solid var(--ch-color-border);
  background: var(--ch-color-surface);
  box-shadow: var(--ch-shadow-sm);
  position: relative;
  overflow: hidden;
}
.ch-advisor-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75rem;
  bottom: 0.75rem;
  width: 3px;
  border-radius: var(--ch-radius-pill);
  background: var(--ch-color-primary);
}
.ch-advisor-card__icon {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 14px;
  display: grid;
  place-content: center;
  font-weight: 800;
  font-size: 1rem;
  flex: 0 0 auto;
  background: var(--ch-color-primary-soft);
  color: var(--ch-color-primary);
}
.ch-advisor-card__body {
  display: grid;
  gap: var(--ch-space-2);
  min-width: 0;
}
.ch-advisor-card__kicker {
  margin: 0;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: var(--ch-tracking-label);
  text-transform: uppercase;
  color: var(--ch-color-text-muted);
}
.ch-advisor-card__title {
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: -0.015em;
  line-height: var(--ch-leading-snug);
}
.ch-advisor-card__text {
  margin: 0;
  color: var(--ch-color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
}
.ch-advisor-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--ch-space-2);
  align-items: center;
  margin-top: var(--ch-space-1);
}
.ch-advisor-card__savings {
  font-size: var(--ch-text-sm);
  font-weight: 700;
  color: var(--ch-color-text);
  background: var(--ch-color-bg);
  border: 1px solid var(--ch-color-border);
  border-radius: var(--ch-radius-pill);
  padding: 0.28rem 0.65rem;
}
.ch-advisor-card__learn {
  margin-top: var(--ch-space-1);
}
.ch-advisor-card__learn summary {
  cursor: pointer;
  font-size: var(--ch-text-sm);
  font-weight: 650;
  color: var(--ch-color-primary);
}
.ch-advisor-card__learn-body {
  margin-top: var(--ch-space-2);
  font-size: var(--ch-text-sm);
  color: var(--ch-color-text-secondary);
  line-height: 1.55;
}
.ch-advisor-card__learn-body ul {
  margin: 0;
  padding-left: 1.1rem;
}
.ch-advisor-card__learn-body p {
  margin: 0;
}

/* Tone accents: Blue insight · Green success · Amber opportunity · Red warning */
.ch-advisor-card--insight::before,
.ch-advisor-card--recommendation::before {
  background: var(--ch-color-primary);
}
.ch-advisor-card--insight,
.ch-advisor-card--recommendation {
  background: linear-gradient(180deg, rgba(239, 246, 255, 0.9), var(--ch-color-surface));
  border-color: rgba(37, 99, 235, 0.18);
}
.ch-advisor-card--insight .ch-advisor-card__icon,
.ch-advisor-card--recommendation .ch-advisor-card__icon {
  background: var(--ch-color-primary-soft);
  color: var(--ch-color-primary);
}
.ch-advisor-card--success::before {
  background: var(--ch-color-success);
}
.ch-advisor-card--success {
  background: linear-gradient(180deg, rgba(240, 253, 244, 0.95), var(--ch-color-surface));
  border-color: rgba(22, 163, 74, 0.22);
}
.ch-advisor-card--success .ch-advisor-card__icon {
  background: var(--ch-color-success-soft);
  color: var(--ch-color-success);
}
.ch-advisor-card--success .ch-advisor-card__kicker {
  color: #15803d;
}
.ch-advisor-card--opportunity::before {
  background: #d97706;
}
.ch-advisor-card--opportunity {
  background: linear-gradient(180deg, rgba(255, 247, 237, 0.95), var(--ch-color-surface));
  border-color: rgba(217, 119, 6, 0.24);
}
.ch-advisor-card--opportunity .ch-advisor-card__icon {
  background: var(--ch-color-warning-soft);
  color: #b45309;
}
.ch-advisor-card--opportunity .ch-advisor-card__kicker {
  color: #b45309;
}
.ch-advisor-card--warning::before {
  background: var(--ch-color-danger);
}
.ch-advisor-card--warning {
  background: linear-gradient(180deg, rgba(254, 242, 242, 0.95), var(--ch-color-surface));
  border-color: rgba(239, 68, 68, 0.22);
}
.ch-advisor-card--warning .ch-advisor-card__icon {
  background: var(--ch-color-danger-soft);
  color: #b91c1c;
}
.ch-advisor-card--warning .ch-advisor-card__kicker {
  color: #b91c1c;
}

.ga-advisor-mount:empty {
  display: none;
}
.ga-advisor-mount .ch-advisor-panel {
  margin-top: var(--ch-space-4);
}

@media (max-width: 640px) {
  .ch-advisor-card {
    grid-template-columns: 1fr;
    gap: var(--ch-space-3);
    padding: var(--ch-space-4);
  }
  .ch-advisor-card__icon {
    width: 2.25rem;
    height: 2.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ch-advisor-card.ch-fade-in {
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}

/* ========== Progress ========== */
.ch-progress {
  display: grid;
  gap: var(--ch-space-2);
}
.ch-progress__meta {
  display: flex;
  justify-content: space-between;
  gap: var(--ch-space-3);
  align-items: baseline;
  font-size: var(--ch-text-sm);
}
.ch-progress__meta span {
  color: var(--ch-color-text-secondary);
}
.ch-progress__meta strong {
  color: var(--ch-color-primary);
}
.ch-progress__track {
  height: 0.55rem;
  border-radius: var(--ch-radius-pill);
  background: var(--ch-color-primary-soft);
  overflow: hidden;
}
.ch-progress__fill {
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--ch-color-primary), #3b82f6);
  transition: width 1s var(--ch-ease);
}
.ch-progress-ring {
  width: 3.25rem;
  height: 3.25rem;
  border-radius: 50%;
  display: grid;
  place-content: center;
  background: var(--ch-color-primary-soft);
  color: var(--ch-color-primary);
  font-weight: 800;
  font-size: 0.85rem;
}
.ch-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--ch-space-2);
}
.ch-steps__item {
  display: flex;
  gap: var(--ch-space-3);
  align-items: center;
  padding: 0.45rem 0.5rem;
  border-radius: var(--ch-radius-md);
  border: 1px solid transparent;
}
.ch-steps__item.is-active {
  background: var(--ch-color-bg);
  border-color: var(--ch-color-border);
  box-shadow: inset 3px 0 0 var(--ch-color-primary);
}
.ch-steps__num {
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 50%;
  display: grid;
  place-content: center;
  background: var(--ch-color-primary-soft);
  color: var(--ch-color-primary);
  font-size: 0.75rem;
  font-weight: 800;
  flex: 0 0 auto;
}
.ch-steps__item.is-complete .ch-steps__num {
  background: var(--ch-color-primary);
  color: #fff;
}
.ch-completion-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--ch-space-2);
  padding: 0.35rem 0.7rem;
  border-radius: var(--ch-radius-pill);
  background: var(--ch-color-success-soft);
  color: var(--ch-color-success);
  font-size: var(--ch-text-sm);
  font-weight: 700;
}
.ch-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-left: 2px solid var(--ch-color-border);
  margin-left: 0.55rem;
}
.ch-timeline__item {
  position: relative;
  padding: 0 0 var(--ch-space-5) var(--ch-space-5);
}
.ch-timeline__item::before {
  content: "";
  position: absolute;
  left: -0.45rem;
  top: 0.35rem;
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background: var(--ch-color-primary);
  box-shadow: 0 0 0 3px var(--ch-color-primary-soft);
}
.ch-milestone {
  padding: var(--ch-space-4);
  border: 1px solid var(--ch-color-border);
  border-radius: var(--ch-radius-md);
  background: var(--ch-color-surface);
}

/* ========== Checklist ========== */
.ch-checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--ch-space-2);
}
.ch-checklist__item {
  display: flex;
  gap: var(--ch-space-3);
  align-items: center;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--ch-color-border);
  border-radius: var(--ch-radius-md);
  background: var(--ch-color-bg);
  font-weight: 600;
}
.ch-checklist__item.is-complete {
  color: var(--ch-color-text);
  background: var(--ch-color-success-soft);
  border-color: rgba(34, 197, 94, 0.28);
}
.ch-checklist__item.is-incomplete {
  color: var(--ch-color-text-secondary);
  font-weight: 500;
}
.ch-checklist__mark {
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  display: grid;
  place-content: center;
  flex: 0 0 auto;
  font-size: 0.8rem;
  font-weight: 800;
}
.ch-checklist__item.is-complete .ch-checklist__mark {
  background: var(--ch-color-accent);
  color: #fff;
}
.ch-checklist__item.is-incomplete .ch-checklist__mark {
  background: var(--ch-color-surface);
  color: var(--ch-color-text-muted);
  border: 1px solid var(--ch-color-border);
}

/* ========== Summary metrics ========== */
.ch-metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--ch-space-3);
}
.ch-metric {
  margin: 0;
  padding: var(--ch-space-4) var(--ch-space-5);
  border: 1px solid var(--ch-color-border);
  border-radius: var(--ch-radius-md);
  background: var(--ch-color-bg);
}
.ch-metric__label {
  margin: 0;
  font-size: var(--ch-text-sm);
  color: var(--ch-color-text-secondary);
  font-weight: 600;
}
.ch-metric__value {
  margin: var(--ch-space-2) 0 0;
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: var(--ch-tracking-tight);
}
.ch-metric__hint {
  margin: var(--ch-space-1) 0 0;
  font-size: 0.8rem;
  color: var(--ch-color-text-secondary);
}
.ch-metric--emphasis {
  background: linear-gradient(180deg, var(--ch-color-primary-soft), #fff);
  border-color: rgba(37, 99, 235, 0.12);
}
.ch-metric--emphasis .ch-metric__label {
  font-size: 0.8rem;
  letter-spacing: var(--ch-tracking-label);
  text-transform: uppercase;
}
@media (max-width: 640px) {
  .ch-metric-grid {
    grid-template-columns: 1fr;
  }
}

/* ========== Charts ========== */
.ch-chart {
  background: var(--ch-color-surface);
  border: 1px solid var(--ch-color-border);
  border-radius: var(--ch-radius-xl);
  padding: var(--ch-space-5);
  min-height: 12rem;
}
.ch-chart__title {
  margin: 0 0 var(--ch-space-4);
  font-size: var(--ch-text-md);
  font-weight: 700;
}
.ch-chart__canvas {
  width: 100%;
  min-height: 10rem;
}

/* ========== Tables ========== */
.ch-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--ch-color-border);
  border-radius: var(--ch-radius-lg);
  background: var(--ch-color-surface);
}
.ch-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--ch-text-sm);
}
.ch-table th,
.ch-table td {
  padding: 0.85rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--ch-color-border);
}
.ch-table th {
  font-size: var(--ch-text-xs);
  letter-spacing: var(--ch-tracking-label);
  text-transform: uppercase;
  color: var(--ch-color-text-muted);
  background: var(--ch-color-bg);
}
.ch-table tr:last-child td {
  border-bottom: 0;
}
.ch-table tbody tr:hover td {
  background: var(--ch-color-primary-soft);
}

/* ========== Tooltips ========== */
.ch-tooltip {
  position: relative;
  display: inline-flex;
  align-items: center;
}
.ch-tooltip__content {
  position: absolute;
  z-index: var(--ch-z-tooltip);
  bottom: calc(100% + 0.4rem);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  min-width: 10rem;
  max-width: 16rem;
  padding: 0.5rem 0.7rem;
  border-radius: var(--ch-radius-md);
  background: var(--ch-color-text);
  color: #fff;
  font-size: var(--ch-text-xs);
  line-height: 1.4;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--ch-duration-fast) var(--ch-ease),
    transform var(--ch-duration-fast) var(--ch-ease);
}
.ch-tooltip:hover .ch-tooltip__content,
.ch-tooltip:focus-within .ch-tooltip__content {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

/* ========== Form components ========== */
.ch-field,
.form-group {
  display: grid;
  gap: var(--ch-space-2);
  margin: 0;
}
.ch-field__label,
.form-label {
  font-size: var(--ch-text-sm);
  font-weight: 600;
  color: var(--ch-color-text);
}
.ch-field__hint,
.form-hint {
  font-size: var(--ch-text-xs);
  color: var(--ch-color-text-muted);
  margin: 0;
  line-height: 1.45;
}
.ch-field__error,
.form-error {
  font-size: var(--ch-text-xs);
  color: var(--ch-color-danger);
  font-weight: 600;
}
.ch-input,
.ch-select,
.ch-textarea,
.form-input,
.form-select {
  width: 100%;
  min-height: var(--ch-touch-min);
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--ch-color-border);
  border-radius: var(--ch-radius-md);
  background: var(--ch-color-bg);
  color: var(--ch-color-text);
  font: inherit;
  transition: border-color var(--ch-duration) var(--ch-ease),
    box-shadow var(--ch-duration) var(--ch-ease);
}
.ch-input:hover,
.ch-select:hover,
.ch-textarea:hover,
.form-input:hover,
.form-select:hover {
  border-color: var(--ch-color-border-strong);
}
.ch-field.is-error .ch-input,
.ch-field.is-error .ch-select,
.ch-field.is-error .ch-textarea,
.form-group.is-error .form-input,
.form-group.is-error .form-select {
  border-color: var(--ch-color-danger);
}
.ch-textarea {
  min-height: 6rem;
  resize: vertical;
}
.ch-input--currency,
.ch-input--percent {
  font-variant-numeric: tabular-nums;
}
.ch-checkbox,
.ch-radio,
.ga-check {
  display: flex;
  gap: var(--ch-space-2);
  align-items: flex-start;
  font-weight: 600;
  cursor: pointer;
  min-height: var(--ch-touch-min);
  align-items: center;
}
.ch-checkbox input,
.ch-radio input,
.ga-check input {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--ch-color-primary);
}
.ch-slider {
  width: 100%;
  accent-color: var(--ch-color-primary);
  min-height: var(--ch-touch-min);
}
.ch-field-row {
  display: grid;
  gap: var(--ch-form-gap);
}

/* ========== Empty / loading / success / error ========== */
.ch-state {
  text-align: center;
  padding: var(--ch-space-10) var(--ch-space-6);
  border: 1px dashed var(--ch-color-border);
  border-radius: var(--ch-radius-xl);
  background: var(--ch-color-surface);
}
.ch-state__title {
  margin: 0 0 var(--ch-space-2);
  font-size: var(--ch-text-xl);
  font-weight: 700;
}
.ch-state__body {
  margin: 0 auto;
  max-width: 28rem;
  color: var(--ch-color-text-secondary);
}
.ch-state--empty .ch-state__title {
  color: var(--ch-color-text);
}
.ch-state--success {
  border-style: solid;
  border-color: rgba(34, 197, 94, 0.28);
  background: var(--ch-color-success-soft);
}
.ch-state--error {
  border-style: solid;
  border-color: rgba(239, 68, 68, 0.28);
  background: var(--ch-color-danger-soft);
}
.ch-loading {
  display: inline-flex;
  align-items: center;
  gap: var(--ch-space-2);
  font-size: var(--ch-text-sm);
  font-weight: 600;
  color: var(--ch-color-primary);
}
.ch-loading__dot {
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--ch-color-primary);
  animation: chPulse 0.9s ease infinite;
}
.ch-loading__dot:nth-child(2) { animation-delay: 0.12s; }
.ch-loading__dot:nth-child(3) { animation-delay: 0.24s; }
.ch-skeleton {
  display: block;
  height: 0.85rem;
  border-radius: var(--ch-radius-sm);
  background: linear-gradient(
    90deg,
    var(--ch-color-border) 0%,
    #f1f5f9 50%,
    var(--ch-color-border) 100%
  );
  background-size: 200% 100%;
  animation: chShimmer 1.2s linear infinite;
}

/* ========== Status chips ========== */
.ch-badge {
  display: inline-flex;
  align-items: center;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: var(--ch-tracking-label);
  text-transform: uppercase;
  padding: 0.3rem 0.55rem;
  border-radius: var(--ch-radius-pill);
  background: var(--ch-color-primary-soft);
  color: var(--ch-color-primary);
  white-space: nowrap;
}
.ch-badge--success {
  background: var(--ch-color-success-soft);
  color: var(--ch-color-success);
}
.ch-badge--warn {
  background: var(--ch-color-warning-soft);
  color: var(--ch-color-warning-text);
}
.ch-badge--neutral {
  background: var(--ch-color-bg);
  color: var(--ch-color-text-muted);
  border: 1px solid var(--ch-color-border);
}

/* ========== Micro-animations ========== */
.ch-fade-in {
  opacity: 0;
  transform: translateY(8px);
}
.ch-fade-in.is-ready,
.is-ready .ch-fade-in {
  animation: chFadeIn 0.45s var(--ch-ease) forwards;
}
.ch-stagger {
  animation-delay: calc(var(--ch-stagger, 0) * 0.055s);
}
.ch-tick {
  transition: color 0.4s var(--ch-ease), transform 0.4s var(--ch-ease);
}
.ch-tick.is-ticking {
  color: var(--ch-color-primary);
  transform: translateY(-1px);
}
@keyframes chFadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes chPulse {
  0%,
  100% { opacity: 0.35; transform: scale(0.9); }
  50% { opacity: 1; transform: scale(1); }
}
@keyframes chShimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
@keyframes chSpin {
  to { transform: rotate(360deg); }
}
@keyframes chSlideUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.ch-slide-in {
  animation: chSlideUp 0.45s var(--ch-ease) both;
}
.ch-success-pop {
  animation: chFadeIn 0.4s var(--ch-ease) both;
}

/* ========== Home Buying bridges (shared tokens on existing surfaces) ========== */
.ai-assume-shell.ai-advisor {
  gap: var(--ch-space-7);
}
.ai-assume-header h2 {
  font-size: var(--ch-text-3xl);
  letter-spacing: var(--ch-tracking-tight);
}
.ga-plan-metric,
.ga-plan-checklist li {
  border-radius: var(--ch-radius-md);
}
.toolkit-hero-outcome-card {
  border-radius: var(--ch-radius-xl);
}