/* ============ Design tokens ============ */
:root,
[data-theme='light'] {
  --color-bg: #f7f5f1;
  --color-surface: #ffffff;
  --color-surface-2: #fbfaf8;
  --color-surface-offset: #f0ede7;
  --color-border: #e1ddd4;
  --color-divider: #ebe7e0;

  --color-text: #1c2430;
  --color-text-muted: #5f6b7a;
  --color-text-faint: #9aa3ad;
  --color-text-inverse: #ffffff;

  --color-primary: #1b3a5c;
  --color-primary-hover: #142c46;
  --color-primary-active: #0e2033;
  --color-primary-highlight: #dde6ee;

  --color-accent: #d9631a;
  --color-accent-hover: #b74f11;
  --color-accent-active: #94400d;
  --color-accent-highlight: #f6ddc9;

  --color-success: #2f7a4d;
  --color-success-highlight: #dcece1;

  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px rgba(28, 36, 48, 0.06);
  --shadow-md: 0 6px 16px rgba(28, 36, 48, 0.08);
  --shadow-lg: 0 16px 36px rgba(28, 36, 48, 0.14);

  --transition-interactive: 160ms cubic-bezier(0.16, 1, 0.3, 1);

  --font-display: 'Cabinet Grotesk', 'Satoshi', 'Segoe UI', sans-serif;
  --font-body: 'Satoshi', 'Segoe UI', sans-serif;

  --text-xs: clamp(0.75rem, 0.72rem + 0.15vw, 0.8125rem);
  --text-sm: clamp(0.875rem, 0.84rem + 0.2vw, 0.9375rem);
  --text-base: clamp(0.9375rem, 0.9rem + 0.2vw, 1rem);
  --text-lg: clamp(1.0625rem, 1rem + 0.4vw, 1.25rem);
  --text-xl: clamp(1.375rem, 1.2rem + 0.9vw, 1.75rem);

  --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;
}

[data-theme='dark'] {
  --color-bg: #14181d;
  --color-surface: #1b2027;
  --color-surface-2: #20262e;
  --color-surface-offset: #262d36;
  --color-border: #333c46;
  --color-divider: #2a313a;

  --color-text: #e8e9ea;
  --color-text-muted: #a2acb6;
  --color-text-faint: #6c7680;
  --color-text-inverse: #14181d;

  --color-primary: #6ea0cb;
  --color-primary-hover: #8bb4d8;
  --color-primary-active: #a6c6e2;
  --color-primary-highlight: #263646;

  --color-accent: #f4923d;
  --color-accent-hover: #f7a862;
  --color-accent-active: #f9bd85;
  --color-accent-highlight: #3d2f1f;

  --color-success: #6fbb8b;
  --color-success-highlight: #1f3128;

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

/* ============ Base reset ============ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { -webkit-text-size-adjust: none; text-size-adjust: none; -webkit-font-smoothing: antialiased; }

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.55;
  padding: var(--space-4);
}

img, svg { display: block; max-width: 100%; }
input, button { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ============ Shell ============ */
.calc-shell {
  max-width: 640px;
  margin: 0 auto;
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  padding: var(--space-6);
}

.calc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--color-divider);
  margin-bottom: var(--space-5);
}

.brand { display: flex; align-items: center; gap: var(--space-3); }

.brand-logo-chip {
  display: block;
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-1) var(--space-2);
  line-height: 0;
  flex-shrink: 0;
}
.brand-logo { height: 40px; width: auto; display: block; }

.brand-text { display: flex; flex-direction: column; }
.brand-tag { font-family: var(--font-display); font-size: var(--text-sm); color: var(--color-text-muted); font-weight: 600; }

.theme-toggle {
  width: 36px; height: 36px;
  display: grid; place-items: center;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  transition: background var(--transition-interactive), color var(--transition-interactive), border-color var(--transition-interactive);
  flex-shrink: 0;
}
.theme-toggle:hover { background: var(--color-surface-offset); color: var(--color-text); }

.calc-intro { color: var(--color-text-muted); font-size: var(--text-sm); margin-bottom: var(--space-6); max-width: 56ch; }

/* ============ Fields ============ */
.calc-form { display: flex; flex-direction: column; gap: var(--space-6); }

.calc-field { border: none; }

.calc-field legend {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-base);
  margin-bottom: var(--space-3);
  padding: 0;
}

.calc-field.is-hidden { display: none; }

/* Pills */
.pill-group { display: flex; flex-wrap: wrap; gap: var(--space-2); }

.pill {
  flex: 1 1 auto;
  min-width: 120px;
  padding: var(--space-3) var(--space-4);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  font-size: var(--text-sm);
  font-weight: 500;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.pill span { font-size: var(--text-xs); color: var(--color-text-muted); font-weight: 400; }
.pill:hover { border-color: var(--color-primary); }
.pill[aria-pressed="true"] {
  background: var(--color-primary-highlight);
  border-color: var(--color-primary);
  color: var(--color-primary);
}
[data-theme='dark'] .pill[aria-pressed="true"] { color: var(--color-text); }
.pill[aria-pressed="true"] span { color: inherit; opacity: 0.75; }

/* Home size cards */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-2); }
@media (max-width: 480px) { .card-grid { grid-template-columns: repeat(2, 1fr); } }

.size-card {
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  padding: var(--space-3);
  text-align: center;
  font-size: var(--text-sm);
  font-weight: 500;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
}
.size-card svg { width: 22px; height: 22px; color: var(--color-text-muted); }
.size-card:hover { border-color: var(--color-primary); }
.size-card[aria-pressed="true"] {
  background: var(--color-primary-highlight);
  border-color: var(--color-primary);
  color: var(--color-primary);
}
[data-theme='dark'] .size-card[aria-pressed="true"] { color: var(--color-text); }
.size-card[aria-pressed="true"] svg { color: inherit; }

.field-hint { font-size: var(--text-xs); color: var(--color-text-faint); margin-top: var(--space-2); }

/* Distance input */
.input-row { margin-bottom: var(--space-4); }
.input-row label { display: block; font-size: var(--text-sm); font-weight: 500; margin-bottom: var(--space-2); }
.input-row input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  font-size: var(--text-base);
}
.input-row input:focus { border-color: var(--color-primary); }

/* Add-ons */
.addon-list { display: flex; flex-direction: column; gap: var(--space-2); }
.addon-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  cursor: pointer;
}
.addon-item:has(input:checked) { border-color: var(--color-primary); background: var(--color-primary-highlight); }
.addon-item input { width: 18px; height: 18px; margin-top: 2px; accent-color: var(--color-primary); flex-shrink: 0; }
.addon-copy { display: flex; flex-direction: column; gap: 2px; }
.addon-title { font-weight: 600; font-size: var(--text-sm); }
.addon-desc { font-size: var(--text-xs); color: var(--color-text-muted); }

/* Submit */
.calc-submit {
  background: var(--color-accent);
  color: #fff;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-base);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}
.calc-submit:hover { background: var(--color-accent-hover); }
.calc-submit:active { background: var(--color-accent-active); }

/* ============ Result ============ */
.result-card {
  margin-top: var(--space-6);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
  text-align: center;
}
.result-card.is-hidden { display: none; }

.result-label { font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-text-muted); font-weight: 600; }
.result-range { font-family: var(--font-display); font-weight: 700; font-size: var(--text-xl); color: var(--color-primary); margin: var(--space-2) 0 var(--space-4); }

.result-breakdown {
  list-style: none;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
  font-size: var(--text-sm);
}
.result-breakdown li { display: flex; justify-content: space-between; gap: var(--space-3); }
.result-breakdown li span:last-child { font-weight: 600; color: var(--color-text); flex-shrink: 0; }
.result-breakdown li span:first-child { color: var(--color-text-muted); }

.result-disclaimer { font-size: var(--text-xs); color: var(--color-text-faint); margin-bottom: var(--space-5); }

.result-cta { display: flex; flex-wrap: wrap; gap: var(--space-3); justify-content: center; }
.cta-primary, .cta-secondary {
  display: inline-flex; align-items: center; justify-content: center;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
}
.cta-primary { background: var(--color-primary); color: #fff; }
.cta-primary:hover { background: var(--color-primary-hover); }
.cta-secondary { background: transparent; color: var(--color-primary); border: 1.5px solid var(--color-primary); }
.cta-secondary:hover { background: var(--color-primary-highlight); }

/* ============ Footer ============ */
.calc-footer { text-align: center; margin-top: var(--space-6); }
.calc-footer a { font-size: var(--text-xs); color: var(--color-text-faint); text-decoration: none; }
.calc-footer a:hover { color: var(--color-text-muted); }

@media (max-width: 420px) {
  .calc-shell { padding: var(--space-4); }
  .result-cta { flex-direction: column; }
  .cta-primary, .cta-secondary { width: 100%; }
}