/**
 * Reusable UI Components
 * Buttons, cards, forms, and common patterns
 */

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-xl);
  font-family: var(--font-secondary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  border: var(--border-width-medium) solid transparent;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  user-select: none;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

/* Button Variants */
.btn-primary {
  background-color: var(--color-primary-500);
  color: var(--color-text-inverse);
  border-color: var(--color-primary-500);
}

.btn-primary:hover {
  background-color: var(--color-primary-600);
  border-color: var(--color-primary-600);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-accent {
  background-color: var(--color-accent-500);
  color: var(--color-primary-500);
  border-color: var(--color-accent-500);
}

.btn-accent:hover {
  background-color: var(--color-accent-600);
  border-color: var(--color-accent-600);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-primary-500);
  border-color: var(--color-primary-500);
}

.btn-secondary:hover {
  background-color: var(--color-primary-500);
  color: var(--color-text-inverse);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-primary-500);
  border-color: transparent;
}

.btn-ghost:hover {
  background-color: var(--color-gray-100);
  color: var(--color-primary-600);
}

/* Button Sizes */
.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-2xl);
  font-size: var(--font-size-lg);
}

/* ============================
   CARDS
   ============================ */

.card {
  background-color: var(--color-bg-primary);
  border: var(--border-width-thin) solid var(--color-border-light);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.card-header {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: var(--border-width-thin) solid var(--color-border-light);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary-500);
  margin-bottom: var(--spacing-xs);
}

.card-body {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

.card-footer {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-md);
  border-top: var(--border-width-thin) solid var(--color-border-light);
}

/* ============================
   GRID UTILITIES
   ============================ */

.grid {
  display: grid;
  gap: var(--spacing-xl);
}

.grid-cols-1 {
  grid-template-columns: repeat(1, 1fr);
}

.grid-cols-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-cols-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-cols-4 {
  grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 768px) {
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============================
   FORMS
   ============================ */

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  border: var(--border-width-thin) solid var(--color-border-medium);
  border-radius: var(--border-radius-md);
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 3px rgba(0, 51, 102, 0.1);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-muted);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-error {
  border-color: var(--color-error);
}

.form-error:focus {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.1);
}

.form-help {
  display: block;
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.form-error-message {
  display: block;
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--color-error);
}

.form-checkbox,
.form-radio {
  width: 1.125rem;
  height: 1.125rem;
  margin-right: var(--spacing-xs);
  cursor: pointer;
}

/* ============================
   BADGES & TAGS
   ============================ */

.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
  border-radius: var(--border-radius-full);
}

.badge-primary {
  background-color: var(--color-primary-100);
  color: var(--color-primary-700);
}

.badge-accent {
  background-color: var(--color-accent-100);
  color: var(--color-accent-800);
}

.badge-success {
  background-color: #d4edda;
  color: #155724;
}

.badge-info {
  background-color: #d1ecf1;
  color: #0c5460;
}

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

.icon {
  display: inline-block;
  width: 1.5rem;
  height: 1.5rem;
  fill: currentColor;
  flex-shrink: 0;
}

.icon-sm {
  width: 1rem;
  height: 1rem;
}

.icon-lg {
  width: 2rem;
  height: 2rem;
}

.icon-xl {
  width: 3rem;
  height: 3rem;
}

/* ============================
   UTILITY CLASSES
   ============================ */

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--section-padding-x);
  padding-right: var(--section-padding-x);
}

.container-narrow {
  max-width: var(--container-narrow);
}

.container-wide {
  max-width: var(--container-wide);
}

/* Flexbox */
.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.items-start {
  align-items: flex-start;
}

.items-end {
  align-items: flex-end;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.justify-around {
  justify-content: space-around;
}

.gap-xs { gap: var(--spacing-xs); }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

/* Spacing */
.mt-xs { margin-top: var(--spacing-xs); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

/* Display */
.block { display: block; }
.inline-block { display: inline-block; }
.hidden { display: none; }

/* Visibility */
.visible { visibility: visible; }
.invisible { visibility: hidden; }

/* Opacity */
.opacity-0 { opacity: 0; }
.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }
.opacity-100 { opacity: 1; }