/**
 * SADC Modern Calendar — 2025 Design System
 * Premium, clean, sophisticated styling
 */

/* ============================================================
   CSS VARIABLES (Design Tokens)
   ============================================================ */

:root {
  /* Navy & Red Theme */
  --sadc-navy: #1a253e;
  --sadc-red: #dc2626;
  --sadc-red-light: #ef4444;
  
  /* Free Course Colors */
  --sadc-free-bg: #f1f5f9;
  --sadc-free-text: #475569;
  --sadc-free-border: #e2e8f0;
  
  /* Color System: Sophisticated Neutrals */
  --sadc-slate-50: #f8fafc;
  --sadc-slate-100: #f1f5f9;
  --sadc-slate-200: #e2e8f0;
  --sadc-slate-300: #cbd5e1;
  --sadc-slate-400: #94a3b8;
  --sadc-slate-500: #64748b;
  --sadc-slate-600: #475569;
  --sadc-slate-700: #334155;
  --sadc-slate-800: #1e293b;
  --sadc-slate-900: #0f172a;
  
  --sadc-blue-50: #eff6ff;
  --sadc-blue-500: #3b82f6;
  --sadc-blue-600: #2563eb;
  
  /* Spacing Scale */
  --sadc-space-1: 0.25rem;
  --sadc-space-2: 0.5rem;
  --sadc-space-3: 0.75rem;
  --sadc-space-4: 1rem;
  --sadc-space-5: 1.25rem;
  --sadc-space-6: 1.5rem;
  
  /* Typography */
  --sadc-font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --sadc-font-medium: 500;
  --sadc-font-semibold: 600;
  --sadc-font-bold: 700;
  
  /* Radii */
  --sadc-radius-sm: 6px;
  --sadc-radius-md: 8px;
  --sadc-radius-lg: 12px;
  --sadc-radius-xl: 16px;
  --sadc-radius-full: 9999px;
  
  /* Shadows */
  --sadc-shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --sadc-shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --sadc-shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --sadc-shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Transitions */
  --sadc-transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --sadc-transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --sadc-transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================
   CALENDAR CONTAINER
   ============================================================ */

.sadc-cal-container {
  font-family: var(--sadc-font-sans);
  background: white;
  border-radius: var(--sadc-radius-xl);
  box-shadow: var(--sadc-shadow-lg);
  border: 1px solid var(--sadc-slate-200);
  overflow: hidden;
  max-width: 1200px;
  margin: 0 auto;
}

/* ============================================================
   HEADER
   ============================================================ */

.sadc-cal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sadc-space-5) var(--sadc-space-6);
  border-bottom: 1px solid var(--sadc-slate-100);
  background: var(--sadc-slate-50);
}

.sadc-cal-title-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sadc-space-2);
}

.sadc-cal-month {
  font-size: 1.25rem;
  font-weight: var(--sadc-font-semibold);
  color: var(--sadc-slate-900);
  margin: 0;
  letter-spacing: -0.025em;
}

.sadc-cal-today-btn {
  padding: var(--sadc-space-1) var(--sadc-space-3);
  font-size: 0.75rem;
  font-weight: var(--sadc-font-medium);
  color: var(--sadc-slate-600);
  background: white;
  border: 1px solid var(--sadc-slate-200);
  border-radius: var(--sadc-radius-full);
  cursor: pointer;
  transition: all var(--sadc-transition-fast);
}

.sadc-cal-today-btn:hover {
  background: var(--sadc-slate-100);
  color: var(--sadc-slate-900);
  border-color: var(--sadc-slate-300);
}

.sadc-cal-nav {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--sadc-slate-200);
  border-radius: var(--sadc-radius-md);
  background: white;
  color: var(--sadc-slate-600);
  cursor: pointer;
  transition: all var(--sadc-transition-fast);
}

.sadc-cal-nav:hover {
  background: var(--sadc-slate-100);
  color: var(--sadc-slate-900);
  border-color: var(--sadc-slate-300);
  transform: translateY(-1px);
}

.sadc-cal-nav:active {
  transform: translateY(0);
}

.sadc-cal-nav svg {
  width: 18px;
  height: 18px;
}

/* ============================================================
   GRID HEADER (Day names)
   ============================================================ */

.sadc-cal-grid-header {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  background: var(--sadc-slate-50);
  border-bottom: 1px solid var(--sadc-slate-200);
  padding: var(--sadc-space-3) 0;
}

.sadc-cal-dow {
  text-align: center;
  font-size: 0.6875rem;
  font-weight: var(--sadc-font-semibold);
  color: var(--sadc-slate-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ============================================================
   GRID & DAY CELLS
   ============================================================ */

.sadc-cal-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  background: white;
}

.sadc-cal-day {
  min-height: 120px;
  padding: var(--sadc-space-3);
  border-right: 1px solid var(--sadc-slate-100);
  border-bottom: 1px solid var(--sadc-slate-100);
  cursor: pointer;
  transition: all var(--sadc-transition-fast);
  display: flex;
  flex-direction: column;
  gap: var(--sadc-space-2);
  position: relative;
}

.sadc-cal-day:nth-child(7n) {
  border-right: none;
}

.sadc-cal-day:hover {
  background: var(--sadc-slate-50);
}

.sadc-cal-day:focus-visible {
  outline: 2px solid var(--sadc-blue-500);
  outline-offset: -2px;
  z-index: 10;
}

/* Other month days */
.sadc-cal-day--other {
  background: var(--sadc-slate-50);
  cursor: default;
}

.sadc-cal-day--other:hover {
  background: var(--sadc-slate-50);
}

.sadc-cal-day--other .sadc-cal-daynr {
  color: var(--sadc-slate-400);
}

/* Today styling - subtle and elegant */
.sadc-cal-day--today {
  background: var(--sadc-blue-50);
}

.sadc-cal-day--today::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--sadc-blue-500);
}

.sadc-cal-day-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sadc-space-1);
}

.sadc-cal-daynr {
  font-size: 0.875rem;
  font-weight: var(--sadc-font-semibold);
  color: var(--sadc-slate-700);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--sadc-radius-md);
}

.sadc-cal-day--today .sadc-cal-daynr {
  background: var(--sadc-blue-500);
  color: white;
}

.sadc-cal-today-badge {
  font-size: 0.625rem;
  font-weight: var(--sadc-font-bold);
  color: var(--sadc-blue-600);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Days with events */
.sadc-cal-day--events {
  background: linear-gradient(135deg, white 0%, var(--sadc-slate-50) 100%);
}

/* ============================================================
   EVENT PILLS (The modern replacement for chips)
   ============================================================ */

.sadc-pills-container {
  display: flex;
  flex-direction: column;
  gap: var(--sadc-space-1);
  flex: 1;
}

.sadc-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--sadc-space-1);
  padding: var(--sadc-space-1) var(--sadc-space-2);
  border-radius: var(--sadc-radius-full);
  font-size: 0.75rem;
  font-weight: var(--sadc-font-medium);
  line-height: 1.25;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: transform var(--sadc-transition-fast), box-shadow var(--sadc-transition-fast);
}

.sadc-pill:hover {
  transform: translateX(2px);
  box-shadow: var(--sadc-shadow-sm);
}

.sadc-pill-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
  background: var(--sadc-red);
  box-shadow: 0 0 0 1px rgba(220, 38, 38, 0.2);
}

/* Pill variants */
.sadc-pill--free {
  background: var(--sadc-free-bg);
  color: var(--sadc-free-text);
  border: 1px solid var(--sadc-free-border);
}

.sadc-pill--free:hover {
  background: var(--sadc-slate-100);
  border-color: var(--sadc-slate-300);
}

.sadc-pill--paid {
  background: var(--sadc-navy);
  color: white;
  border: 1px solid var(--sadc-navy);
}

.sadc-pill--paid:hover {
  background: #152238;
  border-color: #152238;
}

.sadc-pill--featured {
  background: var(--sadc-navy);
  color: white;
  border: 1px solid var(--sadc-navy);
}

.sadc-pill--featured:hover {
  background: #152238;
  border-color: #152238;
}

/* Overflow indicator button */
.sadc-pill-more {
  display: inline-flex;
  align-items: center;
  gap: var(--sadc-space-1);
  padding: var(--sadc-space-1) var(--sadc-space-2);
  background: var(--sadc-slate-100);
  border: 1px solid var(--sadc-slate-200);
  border-radius: var(--sadc-radius-full);
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: var(--sadc-font-medium);
  color: var(--sadc-slate-600);
  transition: all var(--sadc-transition-fast);
  align-self: flex-start;
  margin-top: var(--sadc-space-1);
}

.sadc-pill-more:hover {
  background: var(--sadc-slate-200);
  color: var(--sadc-slate-900);
  border-color: var(--sadc-slate-300);
}

.sadc-pill-more-dots {
  display: flex;
  gap: 2px;
}

.sadc-pill-more-dots span {
  width: 3px;
  height: 3px;
  background: currentColor;
  border-radius: 50%;
}

.sadc-pill-more-count {
  font-weight: var(--sadc-font-semibold);
}

/* ============================================================
   LOADING STATE
   ============================================================ */

.sadc-cal-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sadc-space-4);
  padding: var(--sadc-space-16) var(--sadc-space-6);
  color: var(--sadc-slate-500);
}

.sadc-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--sadc-slate-200);
  border-top-color: var(--sadc-blue-500);
  border-radius: 50%;
  animation: sadc-spin 0.8s linear infinite;
}

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

/* ============================================================
   MODAL (Slide-over style)
   ============================================================ */

.sadc-modal {
  position: fixed;
  inset: 0;
  z-index: 9990;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  background: rgba(15, 23, 42, 0);
  backdrop-filter: blur(0);
  transition: all var(--sadc-transition-base);
  padding: 0;
}

.sadc-modal.sadc-hidden {
  display: none;
}

.sadc-modal.sadc-modal--open {
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
}

.sadc-modal-content {
  background: white;
  width: 100%;
  max-width: 480px;
  height: 100%;
  max-height: 100vh;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform var(--sadc-transition-slow);
  box-shadow: var(--sadc-shadow-xl);
  display: flex;
  flex-direction: column;
}

.sadc-modal--open .sadc-modal-content {
  transform: translateX(0);
}

/* Modal Header */
.sadc-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sadc-space-5) var(--sadc-space-6);
  border-bottom: 1px solid var(--sadc-slate-200);
  background: var(--sadc-slate-50);
  position: sticky;
  top: 0;
  z-index: 10;
}

.sadc-modal-date {
  display: flex;
  align-items: center;
  gap: var(--sadc-space-3);
  color: var(--sadc-slate-700);
}

.sadc-modal-date h2 {
  font-size: 1.125rem;
  font-weight: var(--sadc-font-semibold);
  color: var(--sadc-slate-900);
  margin: 0;
}

.sadc-modal-close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--sadc-slate-200);
  border-radius: var(--sadc-radius-full);
  background: white;
  color: var(--sadc-slate-500);
  cursor: pointer;
  transition: all var(--sadc-transition-fast);
}

.sadc-modal-close:hover {
  background: var(--sadc-slate-100);
  color: var(--sadc-slate-900);
  border-color: var(--sadc-slate-300);
}

/* Modal Body */
.sadc-modal-body {
  flex: 1;
  padding: var(--sadc-space-4);
  overflow-y: auto;
}

/* Empty State */
.sadc-modal-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sadc-space-4);
  padding: var(--sadc-space-16) var(--sadc-space-6);
  color: var(--sadc-slate-500);
  text-align: center;
}

.sadc-modal-empty svg {
  color: var(--sadc-slate-300);
}

/* ============================================================
   COURSE CARDS (In modal)
   ============================================================ */

.sadc-course-list {
  display: flex;
  flex-direction: column;
  gap: var(--sadc-space-4);
}

.sadc-modal-card {
  display: flex;
  flex-direction: row;
  gap: var(--sadc-space-4);
  padding: var(--sadc-space-4);
  background: white;
  border: 1px solid var(--sadc-slate-200);
  border-radius: var(--sadc-radius-lg);
  transition: all var(--sadc-transition-fast);
}

.sadc-modal-card:hover {
  border-color: var(--sadc-slate-300);
  box-shadow: var(--sadc-shadow-md);
  transform: translateY(-2px);
}

.sadc-course-thumb {
  width: 80px;
  height: 80px;
  border-radius: var(--sadc-radius-md);
  overflow: hidden;
  background: var(--sadc-slate-100);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sadc-course-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.sadc-course-thumb--empty {
  color: var(--sadc-slate-400);
}

.sadc-course-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--sadc-space-1);
  min-width: 0;
}

.sadc-course-meta {
  display: flex;
  align-items: center;
  gap: var(--sadc-space-2);
  margin-bottom: var(--sadc-space-1);
}

.sadc-course-badge {
  padding: var(--sadc-space-1) var(--sadc-space-2);
  border-radius: var(--sadc-radius-full);
  font-size: 0.6875rem;
  font-weight: var(--sadc-font-bold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sadc-course-badge--free {
  background: var(--sadc-free-bg);
  color: var(--sadc-free-text);
}

.sadc-course-badge--paid {
  background: var(--sadc-navy);
  color: white;
}

.sadc-course-badge--featured {
  background: var(--sadc-navy);
  color: white;
}

.sadc-course-category {
  font-size: 0.75rem;
  color: var(--sadc-slate-500);
  font-weight: var(--sadc-font-medium);
}

.sadc-course-title {
  font-size: 1rem;
  font-weight: var(--sadc-font-semibold);
  color: var(--sadc-slate-900);
  margin: 0;
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.sadc-course-dates {
  font-size: 0.8125rem;
  color: var(--sadc-slate-600);
  margin: 0;
  display: flex;
  align-items: center;
  gap: var(--sadc-space-1);
}

.sadc-course-excerpt {
  font-size: 0.875rem;
  color: var(--sadc-slate-600);
  line-height: 1.5;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.sadc-course-link {
  display: inline-flex;
  align-items: center;
  gap: var(--sadc-space-1);
  margin-top: auto;
  padding-top: var(--sadc-space-2);
  font-size: 0.875rem;
  font-weight: var(--sadc-font-medium);
  color: var(--sadc-blue-600);
  text-decoration: none;
  transition: color var(--sadc-transition-fast);
}

.sadc-course-link:hover {
  color: var(--sadc-blue-700);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 768px) {
  .sadc-cal-container {
    border-radius: 0;
    border-left: none;
    border-right: none;
  }
  
  .sadc-cal-header {
    padding: var(--sadc-space-4);
  }
  
  .sadc-cal-day {
    min-height: 80px;
    padding: var(--sadc-space-2);
  }
  
  .sadc-cal-daynr {
    width: 24px;
    height: 24px;
    font-size: 0.8125rem;
  }
  
  .sadc-pill {
    font-size: 0.6875rem;
    padding: 2px var(--sadc-space-2);
  }
  
  .sadc-modal {
    align-items: flex-end;
    justify-content: center;
    padding: 0;
  }
  
  .sadc-modal-content {
    max-width: 100%;
    max-height: 85vh;
    border-radius: var(--sadc-radius-xl) var(--sadc-radius-xl) 0 0;
    transform: translateY(100%);
  }
  
  .sadc-modal--open .sadc-modal-content {
    transform: translateY(0);
  }
}

@media (max-width: 480px) {
  .sadc-cal-month {
    font-size: 1.125rem;
  }
  
  .sadc-cal-nav {
    width: 32px;
    height: 32px;
  }
  
  .sadc-modal-card {
    flex-direction: column;
  }
  
  .sadc-course-thumb {
    width: 100%;
    height: 160px;
  }
}

/* ============================================================
   ACCESSIBILITY
   ============================================================ */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (prefers-contrast: more) {
  .sadc-cal-day--today::before {
    height: 3px;
  }
  
  .sadc-pill {
    border-width: 2px;
  }
}