/* ==========================================================
   ✅ WORLD-CLASS BUTTONS — button.css
   - Logic: Interactive Layering & State Feedback
   - Accessibility: 44px+ Hit-zone safe
========================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 12px 24px; /* Standard premium padding */
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent; /* Prevents layout shift on hover */
  white-space: nowrap;
  transition:
    background var(--dur-fast) var(--ease-out),
    border-color var(--dur-fast) var(--ease-out),
    color var(--dur-fast) var(--ease-out),
    transform var(--dur-fast) var(--ease-out),
    box-shadow var(--dur-fast) var(--ease-out);
  user-select: none;
  line-height: 1;
}

/* 1. PRIMARY: The Action Taker */
.btn-primary {
  background: var(--primary);
  color: var(--light);
  box-shadow: 0 4px 14px 0 rgba(var(--primary-rgb), 0.3);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(var(--primary-rgb), 0.4);
}

/* 2. OUTLINE: The Secondary Choice */
.btn-outline {
  background: transparent;
  border-color: var(--primary);
  color: var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: var(--light);
  transform: translateY(-2px);
}

/* 3. HERO/LARGE: For Attention */
.btn-lg {
  padding: 16px 32px;
  font-size: var(--font-size-base);
}

/* 4. GLASS: For Hero Overlays */
.btn-glass {
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: var(--light);
}

.btn-glass:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}

/* 5. ACTIVE & CLICKED STATE 
   - Provides tactile feedback like a real button
---------------------------------------------------------- */
.btn:active {
  transform: translateY(0) scale(0.97); /* "Pressed" feel */
}

/* 6. DISABLED STATE */
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  filter: grayscale(1);
  transform: none !important;
}

/* 7. LOADING SPINNER (For Forms) */
.btn-loading {
  color: transparent !important;
  position: relative;
  pointer-events: none;
}

.btn-loading::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border: 2px solid var(--light);
  border-radius: 50%;
  border-top-color: transparent;
  animation: spin 0.8s linear infinite;
}

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