/* ============================================================
   FOUNDATION — GLOBAL BUTTON SYSTEM
   FILE: assets/css/buttons.css
   Phase 1.3 of the Final Master Roadmap, Stage 1.
   Depends on: tokens.css.
   Owns: every button-like interactive element in the project.
   No later phase may define a new .btn-* class anywhere else —
   Hero and every future section consume this file only.
   ============================================================ */

/* ----------------------------------------------------------
   BASE — shared by every variant
---------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  min-height: var(--touch-target-min);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-btn);
  font-family: var(--font-heading);
  font-size: var(--text-body);
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    background-color var(--duration-fast) var(--ease-premium),
    border-color var(--duration-fast) var(--ease-premium),
    color var(--duration-fast) var(--ease-premium),
    transform var(--duration-fast) var(--ease-premium),
    box-shadow var(--duration-fast) var(--ease-premium);
}

.btn:focus-visible {
  outline: 2px solid var(--color-gold);
  outline-offset: 2px;
}

.btn[disabled],
.btn[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.5;
  transform: none !important;
  box-shadow: none !important;
}

/* ----------------------------------------------------------
   PRIMARY
---------------------------------------------------------- */
.btn--primary {
  background-color: var(--color-gold);
  color: var(--color-navy);
  box-shadow: var(--shadow-sm);
}

.btn--primary:hover:not([disabled]):not([aria-disabled="true"]) {
  background-color: #dfb62f;
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn--primary:active:not([disabled]):not([aria-disabled="true"]) {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

/* ----------------------------------------------------------
   SECONDARY — outline on light, glass-capable on dark
---------------------------------------------------------- */
.btn--secondary {
  background-color: transparent;
  border-color: rgba(var(--color-navy-rgb), 0.3);
  color: var(--color-navy);
}

.btn--secondary:hover:not([disabled]):not([aria-disabled="true"]) {
  border-color: var(--color-navy);
  background-color: rgba(var(--color-navy-rgb), 0.04);
}

.btn--secondary:active:not([disabled]):not([aria-disabled="true"]) {
  background-color: rgba(var(--color-navy-rgb), 0.08);
}

/* Secondary variant intended for use over a dark/photographic
   surface (e.g. Hero) — opt-in via a modifier, not a separate class family */
.btn--secondary.btn--on-dark {
  border-color: rgba(255, 255, 255, 0.4);
  color: var(--color-white);
}

.btn--secondary.btn--on-dark:hover:not([disabled]):not([aria-disabled="true"]) {
  border-color: var(--color-white);
  background-color: rgba(255, 255, 255, 0.08);
}

/* ----------------------------------------------------------
   TERTIARY / TEXT
---------------------------------------------------------- */
.btn--tertiary {
  background-color: transparent;
  border-color: transparent;
  color: var(--color-navy);
  padding-inline: var(--space-1);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.btn--tertiary:hover:not([disabled]):not([aria-disabled="true"]) {
  color: var(--color-gold);
}

/* ----------------------------------------------------------
   ICON BUTTON
---------------------------------------------------------- */
.btn--icon {
  padding: var(--space-1);
  width: var(--touch-target-min);
  height: var(--touch-target-min);
  border-radius: var(--radius-pill);
  background-color: transparent;
  color: var(--color-navy);
}

.btn--icon:hover:not([disabled]):not([aria-disabled="true"]) {
  background-color: rgba(var(--color-navy-rgb), 0.06);
}

.btn--icon svg {
  width: 20px;
  height: 20px;
}

/* ----------------------------------------------------------
   SIZE MODIFIERS (optional, shared across variants)
---------------------------------------------------------- */
.btn--sm {
  min-height: 36px;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-small);
}

.btn--lg {
  min-height: 56px;
  padding: var(--space-3) var(--space-6);
}