/* =====================================================
 * BUTTONS SYSTEM - BLUEPRINT NOIR
 * Unified button components matching the technical aesthetic
 * ===================================================== */

/* ===== BASE BUTTON ===== */
.btn {
  /* Layout */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;

  /* Spacing - More generous padding for better presence */
  padding: 1rem 2.5rem;

  /* Typography */
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
  white-space: nowrap;
  line-height: 1.2;

  /* Visual */
  border-radius: var(--radius-sm); /* Sharp/Tech corners */
  border: 1px solid transparent;
  cursor: pointer;
  position: relative;
  overflow: hidden;

  /* Transitions */
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Focus State */
.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--bg-depth), 0 0 0 4px var(--accent-copper);
}

/* ===== VARIANTS ===== */

/* Primary Button (Copper Gradient) */
.btn-primary {
  background: linear-gradient(
    135deg,
    var(--accent-copper) 0%,
    var(--accent-copper-dim) 100%
  );
  color: #0B0E11; /* Dark text for contrast against copper */
  border-color: var(--accent-copper);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 20px var(--accent-copper-glow);
  filter: brightness(1.1);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: none;
}

/* Secondary Button (Outline/Ghost) */
.btn-secondary {
  background: transparent;
  color: var(--accent-copper);
  border-color: var(--border-tech);
}

.btn-secondary:hover {
  background: var(--accent-copper-glow);
  border-color: var(--accent-copper);
  color: var(--text-primary);
  transform: translateY(-2px);
  box-shadow: 0 0 15px rgba(212, 165, 116, 0.1);
}

.btn-secondary:active {
  transform: translateY(0);
}

/* Completed/Success Button */
.btn-completed {
  background: rgba(16, 185, 129, 0.1);
  color: #10B981;
  border-color: rgba(16, 185, 129, 0.3);
}

.btn-completed:hover {
  background: rgba(16, 185, 129, 0.2);
  border-color: #10B981;
  color: #D1FAE5;
  box-shadow: 0 0 15px rgba(16, 185, 129, 0.2);
  transform: translateY(-1px);
}

/* Danger Button */
.btn-danger {
  background: rgba(239, 68, 68, 0.1);
  color: #EF4444;
  border-color: rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
  background: rgba(239, 68, 68, 0.2);
  border-color: #EF4444;
  color: #FFFFFF;
  box-shadow: 0 0 15px rgba(239, 68, 68, 0.2);
  transform: translateY(-1px);
}

/* Disabled Button */
.btn:disabled,
.btn-disabled {
  background: var(--bg-card);
  color: var(--text-muted);
  border-color: var(--border-tech);
  border-style: dashed;
  cursor: not-allowed;
  opacity: 0.6;
  pointer-events: none;
  box-shadow: none;
  transform: none;
}

/* ===== SIZES ===== */

.btn-sm {
  padding: 0.6rem 1.2rem;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 1rem 2.5rem;
  font-size: 1.1rem;
}

.btn-block {
  width: 100%;
  display: flex;
}

/* ===== ICONS ===== */

.btn-icon-left,
.btn-icon-right {
  width: 1.1rem;
  height: 1.1rem;
  transition: transform 0.2s ease;
}

.btn-icon-left { margin-right: 0.25rem; }
.btn-icon-right { margin-left: 0.25rem; }

/* Icon Animations on Hover */
.btn:hover .btn-icon-left {
  transform: translateX(-3px);
}

.btn:hover .btn-icon-right {
  transform: translateX(3px);
}

/* Loading State (Optional) */
.btn.loading {
  color: transparent !important;
  pointer-events: none;
  position: relative;
}

.btn.loading::after {
  content: '';
  position: absolute;
  width: 1.2rem;
  height: 1.2rem;
  top: 50%; left: 50%;
  margin-top: -0.6rem;
  margin-left: -0.6rem;
  border: 2px solid currentColor;
  border-radius: 50%;
  border-right-color: transparent;
  animation: btn-spin 0.75s linear infinite;
  /* Use original text color for spinner before it was made transparent */
  color: var(--text-secondary); 
}

.btn-primary.loading::after {
  color: #0B0E11;
}

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

/* ===== ANCHOR OVERRIDE ===== */
/* Prevent anchor link styles from affecting buttons */
a.btn,
a.btn-primary,
a.btn-secondary,
a.btn-completed,
a.btn-danger {
  border-bottom: none !important;
  padding-bottom: 1rem !important;
  text-shadow: none !important;
}

a.btn:hover,
a.btn-primary:hover,
a.btn-secondary:hover,
a.btn-completed:hover,
a.btn-danger:hover {
  text-shadow: none !important;
  border-bottom: none !important;
}

/* Ensure button variants maintain their text color when used as anchors */
a.btn-primary {
  color: #0B0E11 !important;
}

a.btn-primary:hover {
  color: #0B0E11 !important;
}

a.btn-secondary {
  color: var(--accent-copper) !important;
}

a.btn-secondary:hover {
  color: var(--text-primary) !important;
}

a.btn-completed {
  color: #10B981 !important;
}

a.btn-completed:hover {
  color: #D1FAE5 !important;
}

a.btn-danger {
  color: #EF4444 !important;
}

a.btn-danger:hover {
  color: #FFFFFF !important;
}

/* ===== OVERRIDE LESSON CONTENT LINK STYLES ===== */
/* Prevent lesson content link styles from affecting buttons */
.lesson-content a.btn,
.lesson-content a.btn-primary,
.lesson-content a.btn-secondary,
.lesson-content a.btn-completed,
.lesson-content a.btn-danger,
.prose a.btn,
.prose a.btn-primary,
.prose a.btn-secondary,
.prose a.btn-completed,
.prose a.btn-danger {
  border-bottom: none !important;
  padding-bottom: 1rem !important;
  background-color: transparent !important;
}

/* Maintain proper button hover states even in lesson content */
.lesson-content a.btn-primary:hover,
.prose a.btn-primary:hover {
  background: linear-gradient(
    135deg,
    var(--accent-copper) 0%,
    var(--accent-copper-dim) 100%
  ) !important;
  color: #0B0E11 !important;
  transform: translateY(-2px);
  box-shadow: 0 0 20px var(--accent-copper-glow) !important;
  filter: brightness(1.1);
  border-bottom: none !important;
}

.lesson-content a.btn-secondary:hover,
.prose a.btn-secondary:hover {
  background: var(--accent-copper-glow) !important;
  border-color: var(--accent-copper) !important;
  color: var(--text-primary) !important;
  transform: translateY(-2px);
  box-shadow: 0 0 15px rgba(212, 165, 116, 0.1) !important;
  border-bottom: none !important;
}

/* ===== MOBILE RESPONSIVE ===== */
@media (max-width: 640px) {
  .btn {
    padding: 0.875rem 2rem;
    font-size: 0.9rem;
    /* Removed width: 100% - buttons should be auto width by default */
  }

  .btn-sm {
    padding: 0.65rem 1.25rem;
    width: auto;
  }

  .btn-block {
    width: 100%; /* Only full width when explicitly requested */
  }
}