/* ═══════════════════════════════════════════════
   Estudios – asignaturas, actividades, recordatorios
   ═══════════════════════════════════════════════ */

/* ── Section layout (column) ─────────────────────── */
.est-section {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-content: start;
}

.est-section .card {
  margin-bottom: 0;
  min-height: 0;
}

/* Rejilla interna de actividades */
.est-activities #estudios-activities {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  align-content: start;
}

.est-activities .est-subject-card {
  margin-bottom: 0;
  min-width: 0;
}

@media (max-width: 900px) {
  .est-activities #estudios-activities {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .est-activities #estudios-activities {
    grid-template-columns: 1fr;
  }
}

/* ── Lista de asignaturas ─────────────────────── */
.est-subjects-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.est-subject-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
}

.est-subject-item .est-subject-name {
  font-weight: 600;
  color: var(--text);
}

.est-subject-item .est-subject-actions {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.est-subject-item input.est-subject-name-inp {
  width: 140px;
  padding: 0.35rem 0.5rem;
  font-size: 0.875rem;
  background: var(--bg);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  color: var(--text);
}

/* ── Badges de estado ─────────────────────────── */
.badge-por_hacer {
  background: rgba(139, 146, 168, 0.25);
  color: var(--text-muted);
}

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

.badge-entregado {
  background: rgba(110, 231, 183, 0.2);
  color: var(--success);
}

/* ── Cards por asignatura ──────────────────────── */
.est-subject-card {
  margin-bottom: 1rem;
}

.est-subject-card h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.est-activity-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border);
}

.est-activity-row:last-of-type {
  border-bottom: none;
}

.est-activity-row .est-activity-name {
  flex: 1;
  min-width: 120px;
}

.est-activity-row .est-activity-deadline {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.est-activity-row .est-activity-edit-inp {
  width: 160px;
  padding: 0.35rem 0.5rem;
  font-size: 0.875rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
}

.est-activity-row .est-activity-edit-date {
  padding: 0.35rem 0.5rem;
  font-size: 0.875rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
}

/* ── Formulario nueva actividad ───────────────── */
.est-form-activity {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.est-form-activity .activity-name {
  flex: 1;
  min-width: 160px;
}

.est-form-activity .activity-type {
  min-width: 120px;
}

.est-form-activity .activity-deadline {
  min-width: 140px;
}

/* ── Próximas entregas (card opcional) ─────────── */
.est-upcoming-card .est-upcoming-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.est-upcoming-card .est-upcoming-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

.est-upcoming-card .est-upcoming-item:last-child {
  border-bottom: none;
}

.est-upcoming-card .est-upcoming-deadline {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Prioridad */
.badge-priority-alta { background: rgba(239, 68, 68, 0.25); color: #ef4444; }
.badge-priority-media { background: rgba(139, 146, 168, 0.25); color: var(--text-muted); }
.badge-priority-baja { background: rgba(110, 231, 183, 0.2); color: var(--success); }

/* Filtros y orden */
.est-filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}
.est-filters select {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 0.5rem 0.75rem;
  font-size: 0.95rem;
}
.est-goal-input {
  width: 80px;
  max-width: 100%;
}

/* Modal notas/enlaces */
.est-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.est-modal {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  min-width: 320px;
  max-width: 90vw;
  max-height: 85vh;
  overflow: auto;
}
.est-modal h4 { margin: 0 0 0.75rem 0; }
.est-modal textarea {
  width: 100%;
  min-height: 80px;
  padding: 0.5rem;
  font-size: 0.875rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  resize: vertical;
}
.est-modal .est-links-list { margin-top: 0.75rem; }
.est-modal .est-link-row { display: flex; gap: 0.5rem; margin-bottom: 0.5rem; }
.est-modal .est-link-row input { flex: 1; padding: 0.4rem; font-size: 0.875rem; background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); }
.est-modal-actions { margin-top: 1rem; display: flex; gap: 0.5rem; justify-content: flex-end; }

/* Grade modal inputs */
.est-grade-modal .est-modal input[type="text"] {
  width: 100%;
  padding: 0.45rem 0.6rem;
  font-size: 0.9rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font);
  box-sizing: border-box;
}

.est-grade-modal .est-modal input[type="text"]:focus {
  outline: none;
  border-color: var(--accent);
}

/* Time modal */
.est-time-modal .est-modal input[type="number"] {
  width: 100%;
  padding: 0.45rem 0.6rem;
  font-size: 0.9rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font);
  box-sizing: border-box;
}

.est-time-modal .est-modal input[type="number"]:focus {
  outline: none;
  border-color: var(--accent);
}

/* Resumen estudios (stats) */
.est-stats-card { margin-bottom: 1rem; }
.est-stats-grid { display: flex; flex-wrap: wrap; gap: 1.5rem; align-items: center; }
.est-stats-item .est-stats-label { font-size: 0.8rem; color: var(--text-muted); }
.est-stats-item .est-stats-value { font-size: 1.25rem; font-weight: 700; font-family: var(--font-mono); }

/* Sesiones / tiempo semana */
.est-week-time { font-size: 0.9rem; color: var(--text-muted); }
.est-add-time-btn { font-size: 0.8rem; }

/* Calendario / línea temporal */
.est-timeline { margin-top: 1rem; }
.est-timeline-day { border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 0.75rem; margin-bottom: 0.5rem; }
.est-timeline-day h4 { font-size: 0.9rem; margin: 0 0 0.5rem 0; color: var(--text-muted); }
.est-timeline-item { font-size: 0.875rem; padding: 0.25rem 0; }

/* Objetivo semanal */
.est-goal-bar { height: 8px; background: var(--border); border-radius: 4px; overflow: hidden; margin-top: 0.5rem; }
.est-goal-bar-fill { height: 100%; background: var(--accent); border-radius: 4px; transition: width 0.3s; }

/* ── Responsive adicional ── */
@media (max-width: 768px) {
  .est-tabs { overflow-x: auto; flex-wrap: nowrap; }
  .est-tab-btn { flex-shrink: 0; }
  .est-modal { width: calc(100vw - 2rem); min-width: 0; max-width: 100%; }
  .est-pomodoro-modal { width: calc(100vw - 2rem); min-width: 0; }
  .est-stats-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .est-stats-grid { grid-template-columns: 1fr; }
}