/**
 * Taekwondo Management System - Reusable UI Components
 *
 * Mobile-first component styles.
 * Relies on CSS custom properties defined in theme.css.
 *
 * Sections:
 *   1.  Alerts / Notifications
 *   2.  Badges
 *   3.  Cards
 *   4.  Modals
 *   5.  Pagination
 *   6.  Loading Spinner
 *   7.  Dropdown Menu
 *   8.  Tabs
 *   9.  Progress Bar
 *   10. Avatar / Profile Image
 *   11. Status Indicators
 *   12. Form Validation Messages
 */

/* ============================================================
   1. ALERTS / NOTIFICATIONS
   ============================================================ */
.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border: var(--border-width) solid transparent;
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-base);
  margin-bottom: var(--spacing-md);
}

.alert-success {
  background-color: #d4edda;
  border-color: #c3e6cb;
  color: #155724;
}

.alert-warning {
  background-color: #fff3cd;
  border-color: #ffeeba;
  color: #856404;
}

.alert-error {
  background-color: #f8d7da;
  border-color: #f5c6cb;
  color: #721c24;
}

.alert-info {
  background-color: #d1ecf1;
  border-color: #bee5eb;
  color: #0c5460;
}

.alert__icon {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
}

.alert__close {
  margin-left: auto;
  background: none;
  border: none;
  cursor: pointer;
  font-size: var(--font-size-lg);
  line-height: 1;
  opacity: 0.6;
  padding: 0;
  color: inherit;
  flex-shrink: 0;
}

.alert__close:hover {
  opacity: 1;
}

/* ============================================================
   2. BADGES
   ============================================================ */
.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px var(--spacing-sm);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  line-height: 1.4;
  border-radius: 12px;
  white-space: nowrap;
  vertical-align: middle;
}

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

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

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

.badge-warning {
  background-color: var(--warning-color);
  color: var(--secondary-color);
}

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

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

.badge-light {
  background-color: var(--light-color);
  color: var(--text-color);
  border: var(--border-width) solid var(--border-color);
}

/* ============================================================
   3. CARDS
   ============================================================ */
/* Base .card is defined in responsive.css; extend here */
.card-header {
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: var(--border-width) solid var(--border-color);
  background-color: var(--light-color);
  border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
  font-weight: var(--font-weight-semibold);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
}

.card-body {
  padding: var(--spacing-md);
}

.card-footer {
  padding: var(--spacing-sm) var(--spacing-md);
  border-top: var(--border-width) solid var(--border-color);
  background-color: var(--light-color);
  border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* Card with no padding (e.g. image cards) */
.card--flush .card-body {
  padding: 0;
}

/* Clickable / hoverable card */
.card--interactive {
  cursor: pointer;
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.card--interactive:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* ============================================================
   4. MODALS
   ============================================================ */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  overflow-y: auto;
  padding: var(--spacing-md);
}

.modal.is-open {
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.55);
  z-index: 199;
}

.modal-dialog {
  position: relative;
  z-index: 201;
  width: 100%;
  max-width: 520px;
  background-color: var(--background-color);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.modal-dialog--sm { max-width: 360px; }
.modal-dialog--lg { max-width: 720px; }

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: var(--border-width) solid var(--border-color);
}

.modal-header__title {
  margin: 0;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--secondary-color);
}

.modal-header__close {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--text-light-color);
  padding: 0;
  min-height: var(--tap-target-min);
  min-width: var(--tap-target-min);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.modal-header__close:hover {
  color: var(--text-color);
  background-color: var(--light-color);
}

.modal-body {
  padding: var(--spacing-lg);
}

.modal-footer {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: var(--border-width) solid var(--border-color);
}

.modal-footer .btn {
  width: 100%;
  justify-content: center;
}

/* ============================================================
   5. PAGINATION
   ============================================================ */
.pagination {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-xs);
  list-style: none;
  margin: var(--spacing-lg) 0 0;
  padding: 0;
}

.pagination__item {
  display: flex;
}

.pagination__link {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: var(--tap-target-min);
  min-height: var(--tap-target-min);
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--primary-color);
  background-color: var(--background-color);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--border-radius);
  text-decoration: none;
  transition: background-color var(--transition-fast),
              border-color var(--transition-fast),
              color var(--transition-fast);
}

.pagination__link:hover:not([aria-disabled="true"]) {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  color: var(--accent-color);
  text-decoration: none;
}

.pagination__link[aria-current="page"],
.pagination__link.is-active {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  color: var(--accent-color);
  pointer-events: none;
}

.pagination__link[aria-disabled="true"] {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

/* ============================================================
   6. LOADING SPINNER
   ============================================================ */
.spinner {
  display: inline-block;
  width: 32px;
  height: 32px;
  border: 3px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
  flex-shrink: 0;
}

.spinner-sm {
  width: 18px;
  height: 18px;
  border-width: 2px;
}

.spinner-lg {
  width: 52px;
  height: 52px;
  border-width: 4px;
}

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

/* Full-page / overlay spinner wrapper */
.spinner-overlay {
  display: flex;
  align-items: center;
  justify-content: center;
  position: fixed;
  inset: 0;
  background-color: rgba(255, 255, 255, 0.75);
  z-index: 300;
}

/* Inline centered spinner */
.spinner-center {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
}

/* ============================================================
   7. DROPDOWN MENU
   ============================================================ */
.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-toggle {
  cursor: pointer;
}

.dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + var(--spacing-xs));
  left: 0;
  z-index: 150;
  min-width: 180px;
  background-color: var(--background-color);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-xs) 0;
  list-style: none;
  margin: 0;
}

.dropdown-menu.is-open {
  display: block;
}

/* Right-aligned variant */
.dropdown-menu--right {
  left: auto;
  right: 0;
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  min-height: var(--tap-target-min);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--text-color);
  text-decoration: none;
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.dropdown-item:hover,
.dropdown-item:focus {
  background-color: var(--light-color);
  color: var(--primary-color);
  text-decoration: none;
}

.dropdown-item--danger {
  color: var(--error-color);
}

.dropdown-item--danger:hover,
.dropdown-item--danger:focus {
  background-color: #f8d7da;
  color: var(--error-color);
}

.dropdown-divider {
  height: 0;
  margin: var(--spacing-xs) 0;
  border-top: var(--border-width) solid var(--border-color);
}

/* ============================================================
   8. TABS
   ============================================================ */
.tabs {
  width: 100%;
}

.tab-list {
  display: flex;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  list-style: none;
  margin: 0 0 var(--spacing-md);
  padding: 0;
  border-bottom: var(--border-width-lg) solid var(--border-color);
  gap: 0;
}

.tab-item {
  flex-shrink: 0;
}

.tab-item__btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  min-height: var(--tap-target-min);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--text-light-color);
  background: none;
  border: none;
  border-bottom: var(--border-width-lg) solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  white-space: nowrap;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.tab-item__btn:hover {
  color: var(--primary-color);
}

.tab-item__btn[aria-selected="true"],
.tab-item__btn.is-active {
  color: var(--primary-color);
  border-bottom-color: var(--primary-color);
}

.tab-panel {
  display: none;
}

.tab-panel.is-active {
  display: block;
}

/* ============================================================
   9. PROGRESS BAR
   ============================================================ */
.progress {
  width: 100%;
  height: 10px;
  background-color: var(--light-color);
  border-radius: 999px;
  overflow: hidden;
  border: var(--border-width) solid var(--border-color);
}

.progress-bar {
  height: 100%;
  background-color: var(--primary-color);
  border-radius: 999px;
  transition: width var(--transition-base);
  min-width: 0;
}

.progress-bar--success { background-color: var(--success-color); }
.progress-bar--warning { background-color: var(--warning-color); }
.progress-bar--info    { background-color: var(--info-color); }

/* Sizes */
.progress--sm { height: 6px; }
.progress--lg { height: 16px; }

/* Striped animated */
.progress-bar--striped {
  background-image: repeating-linear-gradient(
    45deg,
    rgba(255, 255, 255, 0.15) 0,
    rgba(255, 255, 255, 0.15) 10px,
    transparent 10px,
    transparent 20px
  );
}

/* ============================================================
   10. AVATAR / PROFILE IMAGE
   ============================================================ */
.avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: var(--accent-color);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  overflow: hidden;
  flex-shrink: 0;
  user-select: none;
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}

.avatar-sm {
  width: 28px;
  height: 28px;
  font-size: var(--font-size-xs);
}

.avatar-lg {
  width: 64px;
  height: 64px;
  font-size: var(--font-size-lg);
}

/* Avatar group (stacked) */
.avatar-group {
  display: flex;
  flex-direction: row-reverse;
  justify-content: flex-end;
}

.avatar-group .avatar {
  border: 2px solid var(--background-color);
  margin-left: -8px;
}

.avatar-group .avatar:last-child {
  margin-left: 0;
}

/* ============================================================
   11. STATUS INDICATORS
   ============================================================ */
.status-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--border-color);
  flex-shrink: 0;
  vertical-align: middle;
}

.status-active   { background-color: var(--success-color); }
.status-inactive { background-color: var(--text-light-color); }
.status-pending  { background-color: var(--warning-color); }
.status-error    { background-color: var(--error-color); }

/* Inline status label */
.status-label {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Pulsing animation for "live" / active states */
.status-dot--pulse {
  animation: pulse-dot 1.5s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.6; transform: scale(1.3); }
}

/* ============================================================
   12. FORM VALIDATION MESSAGES
   ============================================================ */
.form-error-message {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-xs);
  color: var(--error-color);
  line-height: var(--line-height-base);
}

.form-success-message {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-xs);
  color: var(--success-color);
  line-height: var(--line-height-base);
}

.form-error-message::before {
  content: '✕';
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  flex-shrink: 0;
}

.form-success-message::before {
  content: '✓';
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  flex-shrink: 0;
}

/* ============================================================
   TABLET BREAKPOINT  (min-width: 768px)
   ============================================================ */
@media (min-width: 768px) {

  /* Modals — centered vertically on tablet+ */
  .modal.is-open {
    align-items: center;
  }

  .modal-dialog {
    margin-top: 0;
    margin-bottom: 0;
  }

  /* Modal footer — row layout */
  .modal-footer {
    flex-direction: row;
    justify-content: flex-end;
  }

  .modal-footer .btn {
    width: auto;
  }

  /* Tabs — larger hit targets */
  .tab-item__btn {
    padding: var(--spacing-sm) var(--spacing-lg);
  }
}

/* ============================================================
   13. SITE FOOTER
   ============================================================ */
.site-footer {
  background-color: var(--secondary-color);
  color: rgba(255, 255, 255, 0.85);
  padding: var(--spacing-xxl) 0 0;
  margin-top: var(--spacing-xxl);
  font-size: var(--font-size-sm);
}

/* Multi-column grid — single column on mobile, 4 columns on desktop */
.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.site-footer__heading {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--accent-color);
  margin-bottom: var(--spacing-md);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Brand column */
.site-footer__logo {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--accent-color);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-base);
  text-decoration: none;
  margin-bottom: var(--spacing-md);
}

.site-footer__logo:hover,
.site-footer__logo:focus {
  color: var(--primary-color);
  text-decoration: none;
}

.site-footer__tagline {
  color: rgba(255, 255, 255, 0.65);
  line-height: var(--line-height-base);
  margin: 0;
}

/* Link lists */
.site-footer__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.site-footer__list a {
  color: rgba(255, 255, 255, 0.75);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.site-footer__list a:hover,
.site-footer__list a:focus {
  color: var(--primary-color);
  text-decoration: none;
}

/* Contact */
.site-footer__contact {
  font-style: normal;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.site-footer__contact p {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin: 0;
  color: rgba(255, 255, 255, 0.75);
}

.site-footer__contact a {
  color: rgba(255, 255, 255, 0.75);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.site-footer__contact a:hover,
.site-footer__contact a:focus {
  color: var(--primary-color);
}

/* Social icons */
.site-footer__social {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.site-footer__social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--tap-target-min);
  height: var(--tap-target-min);
  border-radius: var(--border-radius);
  color: rgba(255, 255, 255, 0.75);
  background-color: rgba(255, 255, 255, 0.08);
  text-decoration: none;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.site-footer__social-link:hover,
.site-footer__social-link:focus {
  background-color: var(--primary-color);
  color: var(--accent-color);
  text-decoration: none;
}

/* Bottom bar */
.site-footer__bottom {
  padding: var(--spacing-md) 0;
  text-align: center;
}

.site-footer__copyright {
  margin: 0;
  color: rgba(255, 255, 255, 0.5);
  font-size: var(--font-size-xs);
}

/* ── Tablet (768px+): 2-column grid ── */
@media (min-width: 768px) {
  .site-footer__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .site-footer__col--brand {
    grid-column: span 2;
  }

  .site-footer__bottom {
    text-align: left;
  }
}

/* ── Desktop (1024px+): 4-column grid ── */
@media (min-width: 1024px) {
  .site-footer__grid {
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
  }

  .site-footer__col--brand {
    grid-column: span 1;
  }
}