/**
 * Buttons — First Aid Fast
 * UX Spec §Component Library › 1. Button
 */

/* Base button reset */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--font-bold);
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  padding: 14px 28px;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
  position: relative;
  overflow: hidden;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.btn:focus-visible {
  outline: 3px solid var(--color-primary-500);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   PRIMARY (Red CTA — "Book Training")
   UX Spec: background #A32D2D, text white
   -------------------------------------------------------------------------- */
.btn--primary {
  background-color: var(--color-accent-500);
  color: var(--color-white);
  border-color: var(--color-accent-500);
}

.btn--primary:hover {
  background-color: var(--color-accent-600);
  border-color: var(--color-accent-600);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  color: var(--color-white);
}

.btn--primary:active {
  background-color: var(--color-accent-700);
  border-color: var(--color-accent-700);
  transform: translateY(0);
  box-shadow: none;
}

/* --------------------------------------------------------------------------
   SECONDARY (Red outline)
   -------------------------------------------------------------------------- */
.btn--secondary {
  background-color: transparent;
  color: var(--color-accent-500);
  border-color: var(--color-accent-500);
}

.btn--secondary:hover {
  background-color: var(--color-accent-100);
  color: var(--color-accent-600);
  border-color: var(--color-accent-600);
}

.btn--secondary:active {
  background-color: var(--color-accent-500);
  color: var(--color-white);
}

/* --------------------------------------------------------------------------
   GREEN (Secondary CTA — "View Courses")
   -------------------------------------------------------------------------- */
.btn--green {
  background-color: var(--color-primary-500);
  color: var(--color-white);
  border-color: var(--color-primary-500);
}

.btn--green:hover {
  background-color: var(--color-primary-600);
  border-color: var(--color-primary-600);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  color: var(--color-white);
}

.btn--green:active {
  background-color: var(--color-primary-700);
  border-color: var(--color-primary-700);
  transform: translateY(0);
}

/* --------------------------------------------------------------------------
   ACCENT / OUTLINE-WHITE — Hero CTA buttons
   Used in hero section on green background
   -------------------------------------------------------------------------- */
.btn--accent {
  background-color: var(--color-surface);
  color: var(--color-accent-500);
  border-color: var(--color-accent-500);
}

.btn--accent:hover {
  background-color: var(--color-accent-500);
  color: var(--color-white);
  border-color: var(--color-accent-500);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--outline-white {
  background-color: var(--color-surface);
  color: var(--color-accent-500);
  border-color: var(--color-accent-500);
}

.btn--outline-white:hover {
  background-color: var(--color-accent-500);
  color: var(--color-white);
  border-color: var(--color-accent-500);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* Hero variant (on dark bg) */
.btn--green-outline {
  background-color: transparent;
  color: var(--color-white);
  border-color: rgba(255,255,255,0.6);
}

.btn--green-outline:hover {
  background-color: rgba(255,255,255,0.15);
  border-color: var(--color-white);
  color: var(--color-white);
}

/* --------------------------------------------------------------------------
   SIZE VARIANTS
   -------------------------------------------------------------------------- */
.btn--sm {
  font-size: var(--text-sm);
  padding: 10px 20px;
}

.btn--lg {
  font-size: var(--text-lg);
  padding: 18px 36px;
}

.btn--full {
  width: 100%;
}

/* --------------------------------------------------------------------------
   DISABLED STATE
   -------------------------------------------------------------------------- */
.btn:disabled,
.btn--disabled {
  background-color: var(--color-neutral-300);
  color: var(--color-neutral-500);
  border-color: var(--color-neutral-300);
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
  pointer-events: none;
}

/* --------------------------------------------------------------------------
   LOADING STATE
   UX Spec: 20px white spinner; button retains width
   -------------------------------------------------------------------------- */
.btn--loading {
  cursor: wait;
  pointer-events: none;
  color: transparent !important; /* hide text; spinner shows */
}

.btn--loading::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #FFFFFF;
  border-radius: 50%;
  animation: btn-spin 0.7s linear infinite;
}

.btn--loading.btn--secondary::after,
.btn--loading.btn--green-outline::after {
  border-color: rgba(163,45,45,0.3);
  border-top-color: var(--color-accent-500);
}

@keyframes btn-spin {
  to { transform: rotate(360deg); }
}

/* --------------------------------------------------------------------------
   ICON BUTTON (hamburger, close, scroll-to-top)
   Min touch target: 44×44px
   -------------------------------------------------------------------------- */
.btn--icon {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: var(--radius-md);
  background: transparent;
  border-color: transparent;
  color: var(--color-text-primary);
}

.btn--icon:hover {
  background: var(--color-neutral-100);
  transform: none;
  box-shadow: none;
}

[data-theme="dark"] .btn--icon:hover {
  background: var(--color-neutral-100);
}