/* =============================================================
   Penumbra — Base reset, typography utilities & component classes
   Framework-agnostic. Tokens come from the tokens/ files.
   Consumers can use these classes directly, or the React components.
   ============================================================= */

/* ---------- Base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  background-color: var(--color-background);
  color-scheme: dark;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-ui);
  font-size: var(--text-body-md);
  line-height: var(--leading-body);
  color: var(--color-on-surface);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "cv11", "ss01";
}

::selection {
  background: var(--color-primary);
  color: var(--color-on-primary);
}

a {
  color: var(--color-on-surface);
  text-decoration: none;
  border-bottom: 1px solid var(--color-border);
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

hr {
  border: 0;
  border-top: var(--border-hairline);
  margin: var(--space-2xl) 0;
}

/* ---------- Typography utilities ---------- */
.display-xl,
.display-lg,
.headline-lg,
.headline-md {
  font-family: var(--font-display);
  font-weight: var(--weight-regular);
  color: var(--color-on-surface);
  margin: 0;
  letter-spacing: var(--tracking-display);
}

.display-xl { font-size: var(--text-display-xl); line-height: 1.02; }
.display-lg { font-size: var(--text-display-lg); line-height: 1.05; }
.headline-lg { font-size: var(--text-headline-lg); line-height: 1.1; letter-spacing: var(--tracking-headline); }
.headline-md { font-size: var(--text-headline-md); line-height: 1.15; letter-spacing: var(--tracking-headline); }

.title-md {
  font-family: var(--font-ui);
  font-size: var(--text-title-md);
  font-weight: var(--weight-semibold);
  line-height: 1.35;
  letter-spacing: -0.005em;
  color: var(--color-on-surface);
  margin: 0;
}

.body-md { font-family: var(--font-ui); font-size: var(--text-body-md); line-height: 1.55; color: var(--color-on-surface); }
.body-sm { font-family: var(--font-ui); font-size: var(--text-body-sm); line-height: 1.5; color: var(--color-on-surface-muted); }

.label-sm {
  font-family: var(--font-ui);
  font-size: var(--text-label-sm);
  font-weight: var(--weight-medium);
  line-height: 1.3;
  letter-spacing: 0.02em;
  color: var(--color-on-surface);
}

.eyebrow {
  font-family: var(--font-ui);
  font-size: var(--text-eyebrow);
  font-weight: var(--weight-medium);
  line-height: 1.2;
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--color-on-surface-muted);
  margin: 0;
}

.mono-sm {
  font-family: var(--font-mono);
  font-size: var(--text-mono-sm);
  font-weight: var(--weight-regular);
  line-height: 1.45;
  color: var(--color-on-surface-muted);
}

.text-muted { color: var(--color-on-surface-muted); }
.text-faint { color: var(--color-on-surface-faint); }
.text-primary { color: var(--color-primary); }

em.serif-italic { font-style: italic; font-family: var(--font-display); }

/* ---------- Layout primitives ---------- */
.container { width: 100%; max-width: var(--container-max); margin-inline: auto; padding-inline: var(--space-gutter); }
.container-narrow { width: 100%; max-width: var(--container-narrow); margin-inline: auto; padding-inline: var(--space-gutter); }
.section { padding-block: var(--space-section); }
.stack { display: flex; flex-direction: column; gap: var(--space-lg); }
.stack-sm { display: flex; flex-direction: column; gap: var(--space-sm); }
.stack-lg { display: flex; flex-direction: column; gap: var(--space-2xl); }
.row { display: flex; align-items: center; gap: var(--space-md); flex-wrap: wrap; }
.row-between { display: flex; align-items: center; justify-content: space-between; gap: var(--space-md); }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-xl); }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-xl); }

@media (max-width: 768px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .section { padding-block: var(--space-3xl); }
}

/* ---------- Button ----------
   Variants set background-color / color / border / box-shadow directly
   (no internal custom properties, so nothing is mistaken for a token). */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  height: var(--control-height);
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  background-color: transparent;
  color: var(--color-on-surface);
  box-shadow: none;
  font-family: var(--font-ui);
  font-size: var(--text-label-sm);
  font-weight: var(--weight-medium);
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
  transition: background-color var(--transition-base), color var(--transition-base),
    border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-fast);
}
.btn:focus-visible { outline: none; box-shadow: var(--elevation-glow); border-color: var(--color-focus); }
.btn:disabled, .btn[aria-disabled="true"] { opacity: 0.5; pointer-events: none; }
.btn-primary { background-color: var(--color-primary); color: var(--color-on-primary); border: 1px solid rgba(255,255,255,0.12); box-shadow: var(--elevation-inset-highlight); }
.btn-primary:hover { background-color: var(--color-primary-hover); box-shadow: var(--elevation-inset-highlight), var(--elevation-glow); }
.btn-secondary { background-color: transparent; color: var(--color-on-surface); border: var(--border-hairline); }
.btn-secondary:hover { background-color: var(--color-surface); border: var(--border-strong); }
.btn-ghost { background-color: transparent; color: var(--color-on-surface-muted); height: var(--control-height-sm); padding: 0 14px; }
.btn-ghost:hover { color: var(--color-on-surface); background-color: var(--color-surface); }
.btn-sm { height: var(--control-height-sm); padding: 0 14px; font-size: var(--text-label-sm); }
.btn-icon { width: var(--control-height); height: var(--control-height); padding: 0; }
.btn .icon { width: 16px; height: 16px; stroke-width: 1.5; }

/* ---------- Input & form fields ---------- */
.field { display: flex; flex-direction: column; gap: var(--space-sm); }
.field-label { font-family: var(--font-ui); font-size: var(--text-label-sm); font-weight: var(--weight-medium); color: var(--color-on-surface); letter-spacing: 0.02em; }
.field-help { font-family: var(--font-ui); font-size: var(--text-body-sm); color: var(--color-on-surface-muted); }

.input, .textarea, .select {
  width: 100%;
  height: var(--control-height);
  padding: 0 14px;
  background-color: var(--color-surface-inset);
  color: var(--color-on-surface);
  border: var(--border-hairline);
  border-radius: var(--radius-sm);
  font-family: var(--font-ui);
  font-size: var(--text-body-md);
  line-height: 1.4;
  transition: border-color var(--transition-base), box-shadow var(--transition-base), background-color var(--transition-base);
}
.textarea { height: auto; min-height: 96px; padding: 12px 14px; resize: vertical; line-height: 1.5; }
.input::placeholder, .textarea::placeholder { color: var(--color-on-surface-muted); }
.input:hover, .textarea:hover, .select:hover { border-color: var(--color-border-strong); }
.input:focus, .textarea:focus, .select:focus { outline: none; border-color: var(--color-focus); box-shadow: var(--elevation-glow); }
.input:disabled, .textarea:disabled { color: var(--color-on-surface-faint); cursor: not-allowed; }
.input-group { position: relative; display: flex; align-items: center; }
.input-group .input { padding-left: 40px; }
.input-group .input-icon { position: absolute; left: 14px; width: 16px; height: 16px; color: var(--color-on-surface-muted); pointer-events: none; }

/* ---------- Card ---------- */
.card {
  background-color: var(--color-surface);
  color: var(--color-on-surface);
  border: var(--border-hairline);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  transition: border-color var(--transition-base);
}
.card:hover { border-color: var(--color-border-strong); }
.card .eyebrow { margin-bottom: var(--space-md); }
.card .title-md { margin-bottom: var(--space-sm); }
.card-panel { border-radius: var(--radius-lg); padding: var(--space-2xl); box-shadow: var(--elevation-inset-highlight); }

/* ---------- Atmosphere Card — signature surface ---------- */
.atmosphere-card {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-surface);
  border: var(--border-hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-3xl);
  overflow: hidden;
  isolation: isolate;
  box-shadow: var(--elevation-inset-highlight);
}
.atmosphere-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 20%, rgba(255,255,255,0.05) 0%, transparent 45%),
    radial-gradient(circle at 75% 80%, rgba(255,255,255,0.04) 0%, transparent 50%);
  z-index: 0;
  pointer-events: none;
}
.atmosphere-card > * { position: relative; z-index: 1; }
.atmosphere-medallion {
  position: relative;
  width: 240px;
  height: 240px;
  border-radius: var(--radius-full);
  background-image: radial-gradient(circle, rgba(244,244,245,0.85) 1px, transparent 1.4px);
  background-size: 10px 10px;
  background-position: center;
  -webkit-mask-image: radial-gradient(circle, rgba(0,0,0,1) 0%, rgba(0,0,0,0.85) 35%, rgba(0,0,0,0.25) 70%, transparent 100%);
  mask-image: radial-gradient(circle, rgba(0,0,0,1) 0%, rgba(0,0,0,0.85) 35%, rgba(0,0,0,0.25) 70%, transparent 100%);
}
.atmosphere-medallion::after {
  content: "";
  position: absolute;
  inset: 30%;
  border-radius: var(--radius-full);
  border: var(--border-hairline);
  background: radial-gradient(circle, rgba(232,229,220,0.06) 0%, transparent 70%);
}

/* ---------- Checkbox ---------- */
.checkbox { display: inline-flex; align-items: center; gap: var(--space-md); cursor: pointer; user-select: none; font-family: var(--font-ui); font-size: var(--text-body-md); color: var(--color-on-surface); }
.checkbox input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  margin: 0;
  background-color: var(--color-surface-inset);
  border: var(--border-hairline);
  border-radius: var(--radius-xs);
  cursor: pointer;
  display: inline-grid;
  place-content: center;
  transition: background-color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}
.checkbox input[type="checkbox"]:hover { border-color: var(--color-border-strong); }
.checkbox input[type="checkbox"]:focus-visible { outline: none; box-shadow: var(--elevation-glow); border-color: var(--color-focus); }
.checkbox input[type="checkbox"]::before {
  content: "";
  width: 10px;
  height: 10px;
  transform: scale(0);
  transition: transform var(--transition-fast);
  background-color: var(--color-on-primary);
  clip-path: polygon(14% 44%, 0 65%, 50% 100%, 100% 16%, 80% 0%, 43% 62%);
}
.checkbox input[type="checkbox"]:checked { background-color: var(--color-primary); border-color: var(--color-primary); }
.checkbox input[type="checkbox"]:checked::before { transform: scale(1); }

/* ---------- Tabs ---------- */
.tabs { display: flex; align-items: stretch; gap: var(--space-xl); border-bottom: var(--border-hairline); }
.tab {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 12px 2px;
  margin-bottom: -1px;
  background: transparent;
  border: 0;
  border-bottom: 1px solid transparent;
  color: var(--color-on-surface-muted);
  font-family: var(--font-ui);
  font-size: var(--text-label-sm);
  font-weight: var(--weight-medium);
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: color var(--transition-base), border-color var(--transition-base);
}
.tab:hover { color: var(--color-on-surface); }
.tab[aria-selected="true"], .tab.is-active { color: var(--color-on-surface); border-bottom-color: var(--color-on-surface); }
.tab:focus-visible { outline: none; color: var(--color-on-surface); border-bottom-color: var(--color-focus); }
.tab .icon { width: 14px; height: 14px; stroke-width: 1.5; }

/* ---------- Badge / Tag ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  height: 24px;
  padding: 0 10px;
  border: var(--border-hairline);
  border-radius: var(--radius-full);
  background-color: var(--color-surface);
  color: var(--color-on-surface-muted);
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: var(--weight-medium);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.badge-solid { background-color: var(--color-primary); color: var(--color-on-primary); border-color: var(--color-primary); }

/* ---------- Divider ---------- */
.divider { height: 1px; background-color: var(--color-border); border: 0; margin: 0; }
.divider-strong { background-color: var(--color-border-strong); }

/* ---------- Code ---------- */
code, kbd, pre { font-family: var(--font-mono); font-size: var(--text-mono-sm); }
code { background-color: var(--color-surface-inset); border: var(--border-hairline); border-radius: var(--radius-xs); padding: 1px 6px; color: var(--color-on-surface); }
pre { background-color: var(--color-surface-inset); border: var(--border-hairline); border-radius: var(--radius-sm); padding: var(--space-lg); overflow-x: auto; color: var(--color-on-surface); line-height: 1.5; }
kbd { background-color: var(--color-surface); border: var(--border-hairline); border-bottom-width: 2px; border-radius: var(--radius-xs); padding: 2px 6px; color: var(--color-on-surface); }

/* ---------- Icon ---------- */
.icon { display: inline-block; width: 16px; height: 16px; vertical-align: middle; color: currentColor; stroke-width: 1.5; }
.icon-lg { width: 20px; height: 20px; }

/* ---------- Accessibility helpers ---------- */
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}