/* ============ DESIGN TOKENS ============ */
:root,
[data-theme='light'] {
  /* Surfaces — cool jade-slate */
  --color-bg: #f4f7f5;
  --color-surface: #ffffff;
  --color-surface-2: #fafcfb;
  --color-surface-offset: #edf2ef;
  --color-surface-offset-2: #e3ebe6;
  --color-surface-dynamic: #dbe6e0;
  --color-divider: #dde5e1;
  --color-border: #cfdad4;

  /* Text */
  --color-text: #0f1e18;
  --color-text-muted: #57685f;
  --color-text-faint: #9aab9f;
  --color-text-inverse: #f4f7f5;

  /* Primary accent — jade green */
  --color-primary: #0a6e52;
  --color-primary-hover: #085740;
  --color-primary-active: #06432f;
  --color-primary-highlight: #cfe6dc;

  /* Warning (inflation) — amber */
  --color-warning: #a05a06;
  --color-warning-hover: #7d4605;
  --color-warning-active: #5c3403;
  --color-warning-highlight: #ecdcbf;

  /* Error / negative */
  --color-error: #a12c2c;
  --color-error-hover: #7d1e1e;
  --color-error-active: #561414;
  --color-error-highlight: #e5cfcf;

  /* Data-viz accents (chart series only) */
  --color-blue: #1f6fb2;
  --color-blue-highlight: #cfe0ee;
  --color-orange: #c9761f;
  --color-orange-highlight: #ecdac2;
  --color-success: #2e7d46;
  --color-success-highlight: #d3e6d8;

  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 0.875rem;
  --radius-xl: 1.25rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --shadow-sm: 0 1px 2px oklch(0.2 0.02 160 / 0.06);
  --shadow-md: 0 6px 16px oklch(0.2 0.02 160 / 0.08);
  --shadow-lg: 0 16px 36px oklch(0.2 0.02 160 / 0.12);

  --content-narrow: 640px;
  --content-default: 1000px;
  --content-wide: 1340px;

  --font-display: 'Cabinet Grotesk', 'General Sans', sans-serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', 'Geist Mono', monospace;
}

[data-theme='dark'] {
  --color-bg: #0b1512;
  --color-surface: #0f1c17;
  --color-surface-2: #12211b;
  --color-surface-offset: #16261f;
  --color-surface-offset-2: #1b2e26;
  --color-surface-dynamic: #23392f;
  --color-divider: #1e332a;
  --color-border: #2b4438;
  --color-text: #dfece5;
  --color-text-muted: #8fa89b;
  --color-text-faint: #5e7a6b;
  --color-text-inverse: #0b1512;

  --color-primary: #3fc590;
  --color-primary-hover: #63d3a6;
  --color-primary-active: #86e0bc;
  --color-primary-highlight: #1c3a2d;

  --color-warning: #e0a552;
  --color-warning-hover: #ecb96f;
  --color-warning-active: #f5cd91;
  --color-warning-highlight: #3d2f1a;

  --color-error: #e07272;
  --color-error-hover: #ec9494;
  --color-error-active: #f5b6b6;
  --color-error-highlight: #3a2020;

  --color-blue: #5aa3e0;
  --color-blue-highlight: #1c2f42;
  --color-orange: #e0a15a;
  --color-orange-highlight: #3a2c17;
  --color-success: #5fc17c;
  --color-success-highlight: #1c3324;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
  --shadow-md: 0 6px 16px oklch(0 0 0 / 0.35);
  --shadow-lg: 0 16px 36px oklch(0 0 0 / 0.45);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0b1512;
    --color-surface: #0f1c17;
    --color-surface-2: #12211b;
    --color-surface-offset: #16261f;
    --color-surface-offset-2: #1b2e26;
    --color-surface-dynamic: #23392f;
    --color-divider: #1e332a;
    --color-border: #2b4438;
    --color-text: #dfece5;
    --color-text-muted: #8fa89b;
    --color-text-faint: #5e7a6b;
    --color-text-inverse: #0b1512;
    --color-primary: #3fc590;
    --color-primary-hover: #63d3a6;
    --color-primary-active: #86e0bc;
    --color-primary-highlight: #1c3a2d;
    --color-warning: #e0a552;
    --color-warning-highlight: #3d2f1a;
    --color-error: #e07272;
    --color-error-highlight: #3a2020;
    --color-blue: #5aa3e0;
    --color-blue-highlight: #1c2f42;
    --color-orange: #e0a15a;
    --color-orange-highlight: #3a2c17;
    --color-success: #5fc17c;
    --color-success-highlight: #1c3324;
    --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
    --shadow-md: 0 6px 16px oklch(0 0 0 / 0.35);
    --shadow-lg: 0 16px 36px oklch(0 0 0 / 0.45);
  }
}

/* Type scale */
:root {
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.8125rem);
  --text-sm: clamp(0.875rem, 0.83rem + 0.2vw, 0.9375rem);
  --text-base: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  --text-lg: clamp(1.125rem, 1.02rem + 0.5vw, 1.375rem);
  --text-xl: clamp(1.375rem, 1.15rem + 1vw, 1.875rem);
  --text-2xl: clamp(1.75rem, 1.3rem + 2vw, 2.5rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
}

/* ============ BASE ============ */
body {
  font-family: var(--font-body);
}
h1, h2, h3, h4 {
  font-family: var(--font-display);
  letter-spacing: -0.01em;
}
.mono, .tabular {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums lining-nums;
}

.wrap {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

/* ============ HEADER ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in oklab, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-divider);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-4);
  gap: var(--space-4);
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.brand-mark {
  width: 38px;
  height: 38px;
  color: var(--color-primary);
  flex-shrink: 0;
}
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.brand-text strong {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
}
.brand-text span {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: grid;
  place-items: center;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  flex-shrink: 0;
}
.theme-toggle:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

/* ============ HERO ============ */
.hero {
  padding-block: var(--space-10) var(--space-6);
}
.hero h1 {
  font-size: var(--text-xl);
  font-weight: 700;
  max-width: 46ch;
}
.hero p {
  margin-top: var(--space-3);
  color: var(--color-text-muted);
  max-width: 62ch;
  font-size: var(--text-base);
}
.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-5);
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-full);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.badge strong {
  color: var(--color-text);
  font-family: var(--font-mono);
}
.badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
}

/* ============ SECTIONS ============ */
section {
  padding-block: var(--space-8);
}
.section-head {
  margin-bottom: var(--space-6);
}
.section-head h2 {
  font-size: var(--text-lg);
  font-weight: 700;
}
.section-head p {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin-top: var(--space-2);
  max-width: 68ch;
}
.eyebrow {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: var(--space-2);
  display: block;
}

/* ============ CARD ============ */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

/* ============ CALCULATOR LAYOUT ============ */
.calc-grid {
  display: grid;
  grid-template-columns: minmax(0, 380px) 1fr;
  gap: var(--space-6);
  align-items: start;
}
@media (max-width: 860px) {
  .calc-grid {
    grid-template-columns: 1fr;
  }
}

.inputs-card {
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  position: sticky;
  top: calc(var(--space-16) + 60px);
}
@media (max-width: 860px) {
  .inputs-card {
    position: static;
  }
}

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.field label {
  font-size: var(--text-sm);
  font-weight: 600;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
}
.field label .hint {
  font-size: var(--text-xs);
  font-weight: 400;
  color: var(--color-text-faint);
}
.field .value-readout {
  font-family: var(--font-mono);
  color: var(--color-primary);
  font-weight: 700;
}

.input-money {
  display: flex;
  align-items: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  padding-inline: var(--space-3);
  gap: var(--space-1);
}
.input-money:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-highlight);
}
.input-money span {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}
.input-money input {
  border: none;
  background: none;
  padding: var(--space-3) var(--space-1);
  width: 100%;
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-weight: 600;
  outline: none;
}

input[type='range'] {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  border-radius: var(--radius-full);
  background: linear-gradient(
    to right,
    var(--color-primary) 0%,
    var(--color-primary) var(--fill, 50%),
    var(--color-surface-offset-2) var(--fill, 50%),
    var(--color-surface-offset-2) 100%
  );
}
input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid var(--color-surface);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
}
input[type='range']::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid var(--color-surface);
  cursor: pointer;
}

.scenario-row {
  display: flex;
  gap: var(--space-2);
}
.scenario-btn {
  flex: 1;
  padding: var(--space-2) var(--space-2);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  text-align: center;
}
.scenario-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.scenario-btn.active {
  background: var(--color-primary-highlight);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.static-field {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-offset);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
}
.static-field .lbl {
  color: var(--color-text-muted);
}
.static-field .val {
  font-family: var(--font-mono);
  font-weight: 700;
}

.assumptions-note {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  line-height: 1.5;
  border-top: 1px solid var(--color-divider);
  padding-top: var(--space-4);
}

/* ============ RESULTS ============ */
.results-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}
@media (max-width: 780px) {
  .kpi-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
.kpi-card {
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.kpi-card .kpi-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 600;
}
.kpi-card .kpi-value {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.kpi-card .kpi-value.positive { color: var(--color-primary); }
.kpi-card .kpi-sub {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.kpi-card.accent {
  background: linear-gradient(155deg, var(--color-primary-highlight), var(--color-surface));
  border-color: var(--color-primary);
}

/* ============ COMPARATIVE ============ */
.compare-card {
  padding: var(--space-6);
}
.compare-layout {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: var(--space-8);
  align-items: center;
}
@media (max-width: 780px) {
  .compare-layout {
    grid-template-columns: 1fr;
  }
}
.chart-wrap {
  position: relative;
  height: 260px;
}
.compare-legend {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.compare-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-divider);
}
.compare-row .swatch {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  flex-shrink: 0;
}
.compare-row .compare-body {
  flex: 1;
  min-width: 0;
}
.compare-row .compare-name {
  font-size: var(--text-sm);
  font-weight: 600;
}
.compare-row .compare-desc {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.compare-row .compare-val {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--text-lg);
  flex-shrink: 0;
}
.compare-row.highlight {
  background: var(--color-primary-highlight);
  border-color: var(--color-primary);
}

.disclaimer {
  margin-top: var(--space-5);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-warning-highlight);
  border: 1px solid color-mix(in oklab, var(--color-warning) 40%, transparent);
  font-size: var(--text-xs);
  color: var(--color-text);
  line-height: 1.6;
}

/* ============ TABLE ============ */
.table-card {
  padding: var(--space-2);
  overflow-x: auto;
}
table.amort {
  min-width: 860px;
  width: 100%;
}
table.amort th,
table.amort td {
  padding: var(--space-3) var(--space-3);
  text-align: right;
  font-size: var(--text-sm);
  white-space: nowrap;
}
table.amort th:first-child,
table.amort td:first-child {
  text-align: left;
}
table.amort thead th {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  font-weight: 600;
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background: var(--color-surface);
}
table.amort tbody td {
  font-family: var(--font-mono);
  border-bottom: 1px solid var(--color-divider);
  font-variant-numeric: tabular-nums;
}
table.amort tbody td:first-child {
  font-family: var(--font-body);
  font-weight: 600;
}
table.amort tbody tr:last-child {
  background: var(--color-primary-highlight);
}
table.amort tbody tr:last-child td {
  font-weight: 700;
  color: var(--color-primary-active);
}
[data-theme='dark'] table.amort tbody tr:last-child td {
  color: var(--color-primary);
}

/* ============ FOOTER ============ */
.site-footer {
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-8);
  margin-top: var(--space-8);
}
.site-footer p {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  max-width: 80ch;
  line-height: 1.7;
}
.site-footer a {
  color: var(--color-text-muted);
  text-decoration: underline;
}
.footer-sources {
  margin-top: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.footer-copyright {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-divider);
}

/* ---------- Live data status banner ---------- */
.live-status {
  margin-top: var(--space-4);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md, 12px);
  background: var(--color-surface-2, var(--color-surface));
}
.live-status-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.live-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--color-text-faint);
  flex: none;
}
.live-status.is-live .live-dot {
  background: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in oklch, var(--color-primary) 20%, transparent);
}
.live-status.is-offline .live-dot {
  background: var(--color-amber, #b8860b);
}
.live-status-btn {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  background: transparent;
  border-radius: var(--radius-sm, 8px);
  padding: var(--space-2) var(--space-3);
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s ease, color 0.15s ease;
}
.live-status-btn:hover {
  background: var(--color-primary);
  color: var(--color-on-primary, #fff);
}

/* ---------- Token modal ---------- */
.token-modal-backdrop {
  position: fixed;
  inset: 0;
  background: color-mix(in oklch, black 55%, transparent);
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  z-index: 100;
}
.token-modal-backdrop.open {
  display: flex;
}
.token-modal {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg, 16px);
  padding: var(--space-6);
  max-width: 460px;
  width: 100%;
  box-shadow: var(--shadow-lg);
}
.token-modal h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  margin-bottom: var(--space-3);
}
.token-modal p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: var(--space-3);
}
.token-modal ol {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  padding-left: 1.2em;
  margin-bottom: var(--space-4);
}
.token-modal a {
  color: var(--color-primary);
}
#token-input {
  width: 100%;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  padding: var(--space-3);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-sm, 8px);
  background: var(--color-surface-2, var(--color-surface));
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
#token-input:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}
.token-error {
  font-size: var(--text-xs);
  color: var(--color-danger, #c0392b);
  min-height: 1.2em;
  margin-bottom: var(--space-2) !important;
}
.token-modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  margin-top: var(--space-2);
}
.btn-secondary,
.btn-primary {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-sm, 8px);
  padding: var(--space-2) var(--space-4);
  cursor: pointer;
  border: 1px solid transparent;
}
.btn-secondary {
  background: transparent;
  border-color: var(--color-divider);
  color: var(--color-text-muted);
}
.btn-primary {
  background: var(--color-primary);
  color: var(--color-on-primary, #fff);
}
.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}