* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ── Variables ── */
:root {
  --bg: #f8f9fc;
  --bg-primary: #ffffff;
  --bg-secondary: #f3f4f8;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --accent: #3b82f6;
  --accent-2: #06b6d4;
  --accent-hover: #2563eb;
  --card-bg: #ffffff;
  --border: #e5e7eb;
  --sidebar-bg: #f9fafb;
  --sidebar-text: #1f2937;
  --sidebar-active: #3b82f6;
  --success: #10b981;
  --error: #ef4444;
  --warning: #f59e0b;
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
  --radius: 0.625rem;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg: #0f172a;
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --accent: #3b82f6;
  --accent-2: #06b6d4;
  --accent-hover: #2563eb;
  --card-bg: #1e293b;
  --border: #334155;
  --sidebar-bg: #0f172a;
  --sidebar-text: #f1f5f9;
  --sidebar-active: #3b82f6;
  --success: #10b981;
  --error: #ef4444;
  --warning: #f59e0b;
  --shadow: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.3), 0 2px 4px rgba(0,0,0,0.2);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.3), 0 4px 6px rgba(0,0,0,0.2);
}

/* ── Base ── */
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color 0.4s ease, color 0.4s ease;
  line-height: 1.6;
}

button, input, select, textarea { font: inherit; }

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  letter-spacing: -0.5px;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: var(--transition);
}
a:hover { color: var(--accent-hover); }

.oculto { display: none !important; }

/* ── Animations ── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes slideIn {
  from { opacity: 0; transform: translateX(-8px); }
  to   { opacity: 1; transform: translateX(0); }
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes slideDown {
  from { opacity: 0; max-height: 0; }
  to   { opacity: 1; max-height: 500px; }
}
@keyframes slideInRight {
  from { opacity: 0; transform: translateX(100px); }
  to   { opacity: 1; transform: translateX(0); }
}
@keyframes rotateRing {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.5; }
}

.dashboard-container { animation: fadeIn 0.5s ease forwards; }
.seccion-fade        { animation: fadeIn 0.3s ease forwards; }

/* ── Buttons ── */
.solid, .ghost, .btn-edit, .btn-delete, .btn-session, .btn-menu {
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  padding: 0.625rem 1rem;
  transition: var(--transition);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.3px;
}
.solid {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  color: #fff;
  box-shadow: var(--shadow-md);
}
.solid:hover  { transform: translateY(-2px); box-shadow: 0 12px 24px rgba(59,130,246,0.3); }
.solid:active { transform: translateY(0); }

.ghost { background: transparent; color: var(--text-primary); border: 1px solid var(--border); }
.ghost:hover { background: var(--bg-secondary); border-color: var(--accent); box-shadow: var(--shadow); }

.btn-delete { color: var(--error); background: transparent; border: 1px solid transparent; }
.btn-delete:hover { background: rgba(239,68,68,0.1); border-color: var(--error); }

.btn-edit { color: var(--accent); background: transparent; border: 1px solid transparent; }
.btn-edit:hover { background: rgba(59,130,246,0.1); border-color: var(--accent); }

/* ── Session avatar + spinning halo ── */
.session-avatar-wrapper {
  position: relative;
  width: 56px;
  height: 56px;
  margin-bottom: 0.75rem;
  overflow: visible;
  z-index: 999;           
  isolation: isolate;     
}

.session-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 1.4rem;
  box-shadow: 0 4px 12px rgba(59,130,246,0.3);
  position: relative;
  z-index: 1;
}

.session-avatar-img {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center;
  display: block;
  position: relative;
  z-index: 1;
}

.session-info {
  overflow: visible;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.session-info h4 {
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
  color: var(--text-primary);
  font-weight: 700;
}
.session-info p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin: 2px 0;
}

/* ── Toast ── */
.toast-root {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  display: grid;
  gap: 0.75rem;
  z-index: 50;
  pointer-events: none;
}
.toast-item {
  background: var(--card-bg);
  color: var(--text-primary);
  border: 1px solid var(--border);
  box-shadow: 0 15px 35px rgba(0,0,0,0.2);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  min-width: 280px;
  animation: slideInRight 0.3s ease;
  pointer-events: auto;
  font-weight: 500;
}
.toast-item.toast-error {
  border-left: 4px solid var(--error);
  background: linear-gradient(90deg, rgba(239,68,68,0.1) 0%, var(--card-bg) 100%);
}
.toast-item.toast-ok {
  border-left: 4px solid var(--success);
  background: linear-gradient(90deg, rgba(16,185,129,0.1) 0%, var(--card-bg) 100%);
}

/* ── Modal ── */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: grid;
  place-items: center;
  z-index: 40;
  animation: fadeIn 0.2s ease;
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
}
.modal {
  width: min(620px, 95%);
  max-height: 90vh;
  overflow: auto;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: 0 25px 50px rgba(0,0,0,0.3);
  animation: slideUp 0.3s ease;
}
.modal h3 {
  margin-bottom: 1.5rem;
  font-size: 1.3rem;
  background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.modal form { display: grid; gap: 1.3rem; }
.modal label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  display: block;
  margin-bottom: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}
.modal input,
.modal select,
.modal textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  transition: var(--transition);
}
.modal input:focus,
.modal select:focus,
.modal textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(59,130,246,0.1);
  background: var(--bg-primary);
}
.modal textarea {
  min-height: 120px;
  resize: vertical;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, monospace;
}
.modal-actions {
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
  flex-wrap: wrap;
}

/* ── Shared layout helpers ── */
.section-header,
.filtros-bar,
.quick-actions,
.course-main-info,
.course-actions,
.linea-multimedia {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}
.section-header,
.filtros-bar,
.quick-actions {
  justify-content: space-between;
  margin-bottom: 1.5rem;
}
.section-header h3 { font-size: 1.2rem; margin: 0; }

.content-section,
.course-admin-card,
.module-item,
.carga-box {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
}
.content-section { padding: 1.8rem; }

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.9rem;
  border-radius: 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: capitalize;
  letter-spacing: 0.3px;
}
.badge-activo   { background: rgba(16,185,129,0.15);  color: var(--success); border: 1px solid rgba(16,185,129,0.3); }
.badge-inactivo { background: rgba(156,163,175,0.15); color: #6b7280;        border: 1px solid rgba(156,163,175,0.3); }
.badge-pausado  { background: rgba(245,158,11,0.15);  color: var(--warning); border: 1px solid rgba(245,158,11,0.3); }
.badge-archivado{ background: rgba(107,114,128,0.15); color: #4b5563;        border: 1px solid rgba(107,114,128,0.3); }

/* Pills */
.pill {
  display: inline-block;
  border: 1px solid var(--accent);
  border-radius: 1.5rem;
  padding: 0.4rem 0.9rem;
  margin-right: 0.5rem;
  font-size: 0.76rem;
  background: rgba(59,130,246,0.1);
  color: var(--accent);
  font-weight: 500;
}

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}
.stat-card {
  background: linear-gradient(135deg, var(--card-bg) 0%, rgba(59,130,246,0.02) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.8rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.stat-card::before {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 100px; height: 100px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  opacity: 0.1;
  border-radius: 50%;
  transform: translate(30%, -30%);
}
.stat-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.stat-card h3 {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Tables */
.tabla-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
table { width: 100%; border-collapse: collapse; }
th, td {
  border-bottom: 1px solid var(--border);
  padding: 1rem;
  text-align: left;
  vertical-align: middle;
  font-size: 0.9rem;
}
th {
  color: var(--text-secondary);
  font-weight: 700;
  background: linear-gradient(90deg, rgba(59,130,246,0.05) 0%, rgba(6,182,212,0.02) 100%);
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.5px;
}
td { color: var(--text-primary); }
tr:hover { background: var(--bg-secondary); }
tr:last-child td { border-bottom: none; }

/* Course cards */
.course-admin-card {
  padding: 1.5rem;
  margin-top: 1rem;
  border-left: 4px solid var(--accent);
}
.course-code {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
  border-radius: 0.375rem;
  padding: 0.4rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  box-shadow: var(--shadow);
}
.course-details-preview {
  border-top: 1px solid var(--border);
  margin-top: 1.2rem;
  padding-top: 1.2rem;
}

/* Module items */
.module-item {
  padding: 1.2rem;
  margin-top: 0.75rem;
  background: linear-gradient(135deg, rgba(59,130,246,0.05) 0%, rgba(6,182,212,0.02) 100%);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent-2);
}
.module-item:hover { box-shadow: var(--shadow); }
.module-item h6 { color: var(--accent); margin: 0 0 0.6rem 0; font-size: 0.95rem; font-weight: 700; }

/* Lesson list */
.lesson-list { list-style: none; margin-left: 0; }
.lesson-list li {
  margin-top: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding-left: 1.2rem;
  position: relative;
}
.lesson-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent-2);
  font-weight: 700;
}

/* Docente foto in table */
.docente-foto, .avatar-small {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 0.9rem;
  box-shadow: var(--shadow);
}

/* ── Stat card emoji badge ── */
.stats-grid-3 {
  grid-template-columns: repeat(3, 1fr);
}
@media (max-width: 900px) {
  .stats-grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 500px) {
  .stats-grid-3 { grid-template-columns: 1fr; }
}

.stat-emoji-badge {
  position: absolute;
  top: -2px;
  right: -2px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  box-shadow: 0 4px 12px rgba(59,130,246,0.3);
  transform: translate(30%, -30%);
  /* override the generic ::before circle */
  z-index: 1;
}

/* Hide the old ::before gradient circle when emoji badge is present */
.stat-card:has(.stat-emoji-badge)::before {
  display: none;
}

/* ── Course image in cards / table ── */
.course-img-wrap {
  width: 56px;
  height: 56px;
  border-radius: var(--radius);
  overflow: hidden;
  flex-shrink: 0;
}

.course-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.course-img-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  border-radius: var(--radius);
}

/* Larger image inside the expanded course card detail */
.course-admin-card .course-img-wrap {
  width: 100px;
  height: 100px;
  border-radius: var(--radius);
  margin-right: 1.2rem;
}

.course-admin-card .course-img-placeholder {
  font-size: 2.5rem;
}

.curso-stats {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: 0.4rem;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .stats-grid { grid-template-columns: 1fr; gap: 1rem; }

  .modal { width: min(95vw, 100%); padding: 1.5rem; }

  .section-header,
  .filtros-bar,
  .quick-actions { flex-direction: column; align-items: flex-start; gap: 0.75rem; }

  .section-header h3,
  .filtros-bar button,
  .quick-actions button { width: 100%; }

  table { font-size: 0.8rem; }
  th, td { padding: 0.75rem 0.5rem; }

  .toast-root  { right: 1rem; bottom: 1rem; }
  .toast-item  { min-width: 250px; }
  .content-section { padding: 1.2rem; }
}