/* ============================================================
   UNLEVERED — Base: reset, typography, buttons (site-wide; components.css layers on top)
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

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

::selection { background: var(--selection-bg); color: var(--selection-fg); }

img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; padding: 0; }
a { color: var(--text-primary); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

hr { border: 0; border-top: 1px solid var(--border-default); margin: var(--space-8) 0; }

h1, h2, h3, h4, h5, h6 { margin: 0; font-weight: 500; line-height: var(--leading-snug); }

/* ============================================================
   TYPOGRAPHY CLASSES
   ============================================================ */

.t-display-2xl, .t-display-xl, .t-display-lg, .t-display-md, .t-display-sm {
  font-family: var(--font-display);
  font-weight: 500;
  font-optical-sizing: auto;
  line-height: var(--leading-tight);
  letter-spacing: -0.022em;
  color: var(--text-primary);
}
.t-display-2xl { font-size: var(--type-display-2xl); }
.t-display-xl  { font-size: var(--type-display-xl); }
.t-display-lg  { font-size: var(--type-display-lg); }
.t-display-md  { font-size: var(--type-display-md); }
.t-display-sm  { font-size: var(--type-display-sm); }

.t-h-xl, .t-h-lg, .t-h-md, .t-h-sm, .t-h-xs {
  font-family: var(--font-body);
  font-weight: 500;
  line-height: var(--leading-snug);
  letter-spacing: var(--tracking-snug);
  color: var(--text-primary);
}
.t-h-xl { font-size: var(--type-heading-xl); }
.t-h-lg { font-size: var(--type-heading-lg); }
.t-h-md { font-size: var(--type-heading-md); }
.t-h-sm { font-size: var(--type-heading-sm); }
.t-h-xs { font-size: var(--type-heading-xs); }

.t-body-xl { font-size: var(--type-body-xl); line-height: var(--leading-relaxed); }
.t-body-lg { font-size: var(--type-body-lg); line-height: var(--leading-relaxed); }
.t-body-md { font-size: var(--type-body-md); line-height: var(--leading-normal); }
.t-body-sm { font-size: var(--type-body-sm); line-height: var(--leading-normal); color: var(--text-secondary); }
.t-body-xs { font-size: var(--type-body-xs); line-height: var(--leading-normal); color: var(--text-secondary); }

.t-eyebrow {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--tracking-eyebrow);
  color: var(--text-tertiary);
}

.t-mono { font-family: var(--font-mono); font-feature-settings: "tnum"; }
.t-num  { font-variant-numeric: tabular-nums; }

.t-muted { color: var(--text-secondary); }
.t-faint { color: var(--text-tertiary); }
.t-accent { color: var(--text-accent); }
.t-brand  { color: var(--text-brand); }
.t-serif  { font-family: var(--font-display); font-weight: 400; letter-spacing: var(--tracking-tight); }

/* ============================================================
   BUTTONS
   ============================================================ */

.btn {
  --btn-h: var(--field-h-md);
  --btn-px: 18px;
  --btn-fz: var(--type-body-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: var(--btn-h);
  padding: 0 var(--btn-px);
  font-family: var(--font-body);
  font-size: var(--btn-fz);
  font-weight: 500;
  letter-spacing: -0.005em;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  background: transparent;
  color: inherit;
  cursor: pointer;
  transition:
    background var(--duration-fast) var(--ease-out),
    color      var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) var(--ease-out),
    transform  var(--duration-fast) var(--ease-out);
  white-space: nowrap;
  user-select: none;
}
/* Buttons are never underlined, even as anchors (overrides the global a:hover). */
.btn, .btn:hover, .btn:focus, .btn:active { text-decoration: none; }
/* Phone: a long-labelled button (e.g. "Full depreciation workbook — year-by-
   year through 2065 (XLSX)") must wrap inside its card instead of dragging
   the page past the viewport — the one true horizontal-overflow source on
   the admin study page at 375px. */
@media (max-width: 640px) {
  .btn { max-width: 100%; white-space: normal; height: auto; min-height: var(--btn-h); padding-top: 8px; padding-bottom: 8px; }
}
.btn:focus-visible { outline: none; box-shadow: var(--shadow-focus); }
.btn:active { transform: translateY(0.5px); }
.btn[disabled], .btn.is-disabled {
  opacity: 0.5; cursor: not-allowed; pointer-events: none;
}
.btn .icon { width: 16px; height: 16px; flex: none; }

.btn--sm { --btn-h: var(--field-h-sm); --btn-px: 12px; --btn-fz: var(--type-body-sm); }
.btn--lg { --btn-h: var(--field-h-lg); --btn-px: 22px; --btn-fz: var(--type-body-lg); }
.btn--icon { --btn-px: 0; width: var(--btn-h); }
.btn--block { width: 100%; }

.btn--primary {
  background: var(--action-primary-bg);
  color: var(--action-primary-fg);
  border-color: var(--action-primary-border);
}
.btn--primary:hover { background: var(--action-primary-bg-hover); border-color: var(--action-primary-bg-hover); }
.btn--primary:active { background: var(--action-primary-bg-active); }

/* Large-surface CTA: white background, forest-800 outline, forest-800 text.
   Use for hero CTAs, primary buttons >200px wide, and surfaces where copy
   lives inside a green block. See STORYBOARD §GG. */
.btn--primary-outline {
  background: var(--surface-raised);
  color: var(--action-primary-bg);
  border-color: var(--action-primary-bg);
  border-width: 1.5px;
}
.btn--primary-outline:hover { background: var(--ulv-forest-50); }
.btn--primary-outline:active { background: var(--ulv-forest-100); }

.btn--secondary {
  background: var(--action-secondary-bg);
  color: var(--action-secondary-fg);
  border-color: var(--action-secondary-border);
}
.btn--secondary:hover { background: var(--action-secondary-bg-hover); }

.btn--ghost {
  color: var(--action-ghost-fg);
  background: transparent;
}
.btn--ghost:hover { background: var(--action-ghost-bg-hover); }

.btn--danger {
  background: var(--action-danger-bg);
  color: var(--action-danger-fg);
  border-color: var(--action-danger-bg);
}
.btn--danger:hover { background: var(--action-danger-bg-hover); border-color: var(--action-danger-bg-hover); }
.btn--danger:focus-visible { box-shadow: var(--shadow-focus-danger); }

.btn--link {
  height: auto; padding: 0; border-radius: 0;
  background: transparent;
  color: var(--text-brand);
  border-bottom: 1px solid currentColor;
  border-color: transparent;
}
.btn--link:hover { color: var(--ulv-forest-700); }


/* Brand-mark links — never carry hover underline. The logo mark doesn't
   visually need it and the underline bleeds under the wordmark. */
.brand-link { display: inline-flex; align-items: center; color: inherit; }
.brand-link:hover { text-decoration: none; }