/* =====================================================
   DESIGN SYSTEM – EPN Horarios App
   ===================================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
  /* Colors */
  --bg-base: #0d0f14;
  --bg-surface: #13161e;
  --bg-card: #1a1e2a;
  --bg-card-hover: #1f2436;
  --bg-glass: rgba(255, 255, 255, 0.04);
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.16);

  --text-primary: #f0f2f8;
  --text-secondary: #8890a8;
  --text-muted: #555d73;

  --accent: #6c63ff;
  --accent-light: #8b83ff;
  --accent-glow: rgba(108, 99, 255, 0.25);

  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;

  /* Subject colors (6to Semestre) */
  --color-procesos: #06b6d4;
  --color-web: #3b82f6;
  --color-agiles: #f59e0b;
  --color-construccion: #10b981;
  --color-seguridad: #ec4899;
  --color-calidad: #8b5cf6;
  --color-financiera: #f97316;

  /* Layout */
  --sidebar-w: 300px;
  --header-h: 64px;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 18px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 48px rgba(0, 0, 0, 0.6);
  --transition: all 0.2s ease;
}

/* =====================================================
   RESET & BASE
   ===================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

/* =====================================================
   HEADER
   ===================================================== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(13, 15, 20, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.header-content {
  max-width: 1600px;
  margin: 0 auto;
  height: 100%;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent), #a855f7);
  border-radius: var(--radius-sm);
  display: grid;
  place-items: center;
  font-size: 20px;
  box-shadow: 0 0 20px var(--accent-glow);
}

.header-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(90deg, #fff, #a5b4fc);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header-subtitle {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 1px;
}

/* Tabs */
.tab-buttons {
  display: flex;
  gap: 6px;
}

.tab-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-glass);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.tab-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 0 16px var(--accent-glow);
}

.fav-count {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  padding: 1px 7px;
  font-size: 0.72rem;
  font-weight: 700;
}

/* =====================================================
   LAYOUT
   ===================================================== */
.main-layout {
  display: flex;
  max-width: 1600px;
  margin: 0 auto;
  min-height: calc(100vh - var(--header-h));
}

/* =====================================================
   SIDEBAR
   ===================================================== */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  padding: 24px 20px;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 28px;
  position: sticky;
  top: var(--header-h);
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
}

.sidebar::-webkit-scrollbar {
  width: 4px;
}

.sidebar::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

.sidebar-title {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.sidebar-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 16px;
}

/* Subject filter cards */
.subject-filters {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.filter-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  transition: var(--transition);
}

.filter-card:hover {
  border-color: var(--border-hover);
}

.filter-card.is-disabled {
  opacity: 0.45;
  filter: grayscale(0.4);
}

.filter-card.is-disabled .filter-btns {
  pointer-events: none;
}

.filter-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}

.filter-header-left {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow: hidden;
}

/* Switch Toggle Component */
.switch {
  position: relative;
  display: inline-block;
  width: 36px;
  height: 20px;
  flex-shrink: 0;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.switch-slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: #242938;
  transition: 0.25s ease;
  border-radius: 20px;
  border: 1px solid var(--border);
}

.switch-slider:before {
  position: absolute;
  content: "";
  height: 14px;
  width: 14px;
  left: 2px;
  bottom: 2px;
  background-color: #8890a8;
  transition: 0.25s ease;
  border-radius: 50%;
}

.switch input:checked + .switch-slider {
  background-color: var(--accent);
  border-color: var(--accent-light);
}

.switch input:checked + .switch-slider:before {
  transform: translateX(16px);
  background-color: #ffffff;
}

/* Header actions & No-Conflict Toggle */
.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.no-conflict-toggle-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  user-select: none;
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
}

.no-conflict-toggle-wrap:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.no-conflict-toggle-wrap.active {
  border-color: rgba(34, 197, 94, 0.4);
  background: rgba(34, 197, 94, 0.1);
  color: #4ade80;
}

.filter-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.filter-name {
  font-size: 0.78rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.filter-btns {
  display: flex;
  gap: 4px;
}

.filter-btn {
  flex: 1;
  padding: 5px 6px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.72rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
  white-space: nowrap;
}

.filter-btn:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.filter-btn.selected {
  color: #fff;
  border-color: transparent;
}

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, #fff, #a5b4fc);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: 0.68rem;
  color: var(--text-muted);
  text-align: center;
}

/* Legend */
.legend {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.77rem;
  color: var(--text-secondary);
}

.legend-dot {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  flex-shrink: 0;
}

/* =====================================================
   CONTENT
   ===================================================== */
.content {
  flex: 1;
  padding: 24px;
  overflow-x: auto;
}

.content-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  gap: 16px;
  flex-wrap: wrap;
}

.view-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.sort-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.sort-controls select {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: 6px 10px;
  font-size: 0.8rem;
  cursor: pointer;
  outline: none;
  transition: var(--transition);
}

.sort-controls select:hover,
.sort-controls select:focus {
  border-color: var(--accent);
}

/* Combos grid */
.combos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 20px;
}

/* =====================================================
   COMBO CARD
   ===================================================== */
.combo-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  position: relative;
  overflow: hidden;
}

.combo-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(108, 99, 255, 0.04), transparent);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.combo-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: var(--border-hover);
}

.combo-card:hover::before {
  opacity: 1;
}

.combo-card.is-favorite {
  border-color: rgba(245, 158, 11, 0.4);
  background: linear-gradient(135deg, var(--bg-card), rgba(245, 158, 11, 0.04));
}

.combo-card.has-conflict {
  border-color: rgba(239, 68, 68, 0.3);
}

.combo-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 14px;
}

.combo-num {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--accent-light);
  background: rgba(108, 99, 255, 0.12);
  padding: 3px 10px;
  border-radius: 999px;
}

.combo-badges {
  display: flex;
  gap: 6px;
  align-items: center;
}

.badge {
  font-size: 0.68rem;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 999px;
}

.badge-ok {
  background: rgba(34, 197, 94, 0.15);
  color: var(--success);
}

.badge-conflict {
  background: rgba(239, 68, 68, 0.15);
  color: var(--danger);
}

.fav-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  padding: 2px 4px;
  border-radius: 6px;
  transition: transform 0.15s ease;
  line-height: 1;
}

.fav-btn:hover {
  transform: scale(1.25);
}

/* Mini calendar inside card */
.mini-calendar {
  overflow: hidden;
  border-radius: var(--radius-sm);
}

.mini-cal-header {
  display: grid;
  grid-template-columns: 48px repeat(5, 1fr);
  gap: 2px;
  margin-bottom: 2px;
}

.mini-cal-day {
  text-align: center;
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 2px;
}

.mini-cal-body {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.mini-cal-row {
  display: grid;
  grid-template-columns: 48px repeat(5, 1fr);
  gap: 2px;
  height: 14px;
}

.mini-cal-time {
  font-size: 0.6rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  padding-right: 6px;
  white-space: nowrap;
  justify-content: flex-end;
}

.mini-cal-cell {
  border-radius: 2px;
  height: 100%;
}

.mini-cal-cell.empty {
  background: var(--bg-glass);
}

.mini-cal-cell.filled {
  border-radius: 2px;
  opacity: 0.9;
  position: relative;
}

.mini-cal-cell.conflict-cell {
  background: var(--danger) !important;
  opacity: 1;
  animation: pulse-conflict 1.5s ease infinite;
}

@keyframes pulse-conflict {

  0%,
  100% {
    opacity: 0.9;
  }

  50% {
    opacity: 0.5;
  }
}

/* Parallels summary strip */
.parallels-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 12px;
}

.parallel-chip {
  font-size: 0.65rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 6px;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

/* =====================================================
   EMPTY STATE
   ===================================================== */
.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-muted);
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 16px;
}

.hidden {
  display: none !important;
}

/* =====================================================
   MODAL
   ===================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(6px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  max-width: 960px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.modal::-webkit-scrollbar {
  width: 4px;
}

.modal::-webkit-scrollbar-track {
  background: transparent;
}

.modal::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

.modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 24px 28px 0;
  gap: 16px;
}

.modal-combo-num {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-light);
  background: rgba(108, 99, 255, 0.12);
  padding: 3px 12px;
  border-radius: 999px;
  display: inline-block;
  margin-bottom: 6px;
}

.modal-title {
  font-size: 1.15rem;
  font-weight: 700;
}

.modal-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

.btn-fav-modal {
  font-size: 1.4rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
  transition: var(--transition);
  line-height: 1;
}

.btn-fav-modal:hover {
  border-color: var(--warning);
  background: rgba(245, 158, 11, 0.1);
}

.btn-fav-modal.active {
  border-color: var(--warning);
  background: rgba(245, 158, 11, 0.15);
}

.btn-close {
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-secondary);
  padding: 6px 12px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: var(--transition);
}

.btn-close:hover {
  border-color: var(--danger);
  color: var(--danger);
}

.modal-body {
  padding: 24px 28px 28px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Full-size calendar in modal */
.calendar-grid-modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.cal-header-row {
  display: grid;
  grid-template-columns: 52px repeat(5, 1fr);
  background: var(--bg-glass);
  border-bottom: 1px solid var(--border);
}

.cal-day-header {
  padding: 10px 8px;
  text-align: center;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.cal-grid-body {
  border-top: 1px solid var(--border);
}

.cal-time-label {
  padding: 0 8px;
  font-size: 0.64rem;
  color: var(--text-muted);
  display: flex;
  align-items: flex-start;
  padding-top: 3px;
  white-space: nowrap;
  border-right: 1px solid var(--border);
  background: var(--bg-surface);
  position: relative;
  z-index: 1;
}

.cal-time-label.hour-line {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.cal-cell {
  border-left: 1px solid rgba(255, 255, 255, 0.03);
  background: var(--bg-card);
}

.cal-cell.hour-line {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.cal-block {
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 0.72rem;
  font-weight: 600;
  color: #fff;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  cursor: default;
  /* grid-column/grid-row set by JS */
}

.cal-block.conflict-block {
  background: var(--danger) !important;
  outline: 2px solid rgba(239, 68, 68, 0.5);
}

/* Modal subjects list */
.modal-subjects {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.modal-subject-row {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
}

.modal-subj-dot {
  width: 14px;
  height: 14px;
  border-radius: 4px;
  flex-shrink: 0;
}

.modal-subj-info {
  flex: 1;
}

.modal-subj-name {
  font-size: 0.82rem;
  font-weight: 600;
}

.modal-subj-times {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 3px;
}

.modal-subj-par {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

/* Conflict warning in modal */
.conflict-warning {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 0.78rem;
  color: var(--danger);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* =====================================================
   RESPONSIVE
   ===================================================== */
@media (max-width: 900px) {
  .sidebar {
    width: 260px;
  }

  .combos-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  .main-layout {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: 16px;
  }

  .content {
    padding: 16px;
  }

  .header-title {
    font-size: 0.95rem;
  }
}

/* Scrollbar overall */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 6px;
}