:root {
    --bg-main: #0f172a;       
    --bg-card: #1e293b;       
    --bg-item: #334155;       
    --text-main: #f8fafc;     
    --text-muted: #94a3b8;    
    --primary: #8b5cf6;       
    --primary-hover: #7c3aed;
    --border-color: #334155;
    
    --fc-border-color: #334155;
    --fc-page-bg-color: #1e293b;
    --fc-neutral-bg-color: #1e293b;
    --fc-button-bg-color: #8b5cf6;
    --fc-button-border-color: #8b5cf6;
    --fc-button-hover-bg-color: #7c3aed;
    --fc-button-hover-border-color: #7c3aed;
    --fc-button-active-bg-color: #6d28d9;
    --fc-today-bg-color: rgba(139, 92, 246, 0.15); 
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Inter', sans-serif; }

body { background-color: var(--bg-main); color: var(--text-main); padding: 0 2rem 2rem 2rem; min-height: 100vh; transition: background-color 0.3s; }

h2, h3 { font-family: 'Poppins', sans-serif; color: var(--text-main); letter-spacing: 0.5px; }
h2 { font-size: 1.4rem; font-weight: 600; margin-bottom: 1.2rem; display: flex; align-items: center; gap: 0.5rem; }

/* --- HEADER FIJO --- */
.sticky-header {
    position: sticky;
    top: 0;
    background-color: var(--bg-main);
    z-index: 2000;
    padding: 1.5rem 0;
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.3s;
}

.user-login {
    display: flex;
    gap: 10px;
}

.user-login input {
    margin-bottom: 0;
    padding: 0.5rem 1rem;
    width: 250px;
}

.user-login input:disabled, .user-login input[readonly] {
    opacity: 0.6;
    cursor: not-allowed;
}

.user-login button {
    padding: 0.5rem 1rem;
}

.theme-toggle {
    padding: 10px 15px;
    cursor: pointer;
    background: #333;
    color: white;
    border-radius: 8px;
    border: none;
    font-weight: 600;
}

/* --- PANELES --- */
.main-container { display: flex; gap: 2rem; max-width: 1400px; margin: 0 auto; }
.left-panel { flex: 7; background: var(--bg-card); padding: 2rem; border-radius: 24px; box-shadow: 0 20px 40px rgba(0,0,0,0.4); border: 1px solid var(--border-color); }
.right-panel { flex: 4; display: flex; flex-direction: column; gap: 2rem; }
.section-card { background: var(--bg-card); padding: 2rem; border-radius: 24px; box-shadow: 0 20px 40px rgba(0,0,0,0.4); border: 1px solid var(--border-color); }

/* --- LISTAS Y TAREAS --- */
.task-list { list-style: none; display: flex; flex-direction: column; gap: 1rem; max-height: 380px; overflow-y: auto; padding-right: 8px; }
.task-list::-webkit-scrollbar { width: 6px; }
.task-list::-webkit-scrollbar-thumb { background: #475569; border-radius: 10px; }
.task-item { display: flex; justify-content: space-between; align-items: center; padding: 1.2rem; background: var(--bg-item); border: 1px solid var(--border-color); border-radius: 16px; transition: all 0.3s; flex-shrink: 0; }
.task-item:hover { transform: translateY(-4px); box-shadow: 0 10px 20px rgba(0,0,0,0.3); border-color: var(--primary); }
.task-item.completing { opacity: 0; transform: translateX(100px) scale(0.9); }
.task-info { flex: 1; }
.task-title { font-family: 'Poppins', sans-serif; font-weight: 600; font-size: 1.05rem; margin-bottom: 0.4rem; }
.task-meta { display: flex; gap: 0.8rem; align-items: center; font-size: 0.85rem; color: var(--text-muted); }

/* Badges de Prioridad */
.badge { padding: 0.25rem 0.7rem; border-radius: 8px; font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; }
.badge-alta { background: rgba(239,68,68,0.2); color: #f87171; border: 1px solid #ef4444; }
.badge-media { background: rgba(245,158,11,0.2); color: #fbbf24; border: 1px solid #f59e0b; }
.badge-baja { background: rgba(16,185,129,0.2); color: #34d399; border: 1px solid #10b981; }

input[type="checkbox"] { width: 24px; height: 24px; accent-color: var(--primary); cursor: pointer; transition: transform 0.2s; }
input[type="checkbox"]:hover { transform: scale(1.15); }

/* --- BOTONES --- */
button { font-family: 'Poppins', sans-serif; background: var(--primary); color: #fff; border: none; padding: 0.9rem 1.5rem; border-radius: 12px; cursor: pointer; font-weight: 600; transition: all 0.2s; }
button:hover { background: var(--primary-hover); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(139, 92, 246, 0.4); }

.btn-secondary { background: transparent; color: var(--text-main); border: 1px solid var(--border-color); }
.btn-secondary:hover { background: var(--bg-item); box-shadow: none; border-color: var(--text-muted); }

.btn-danger { background-color: #ef4444; color: white; }
.btn-danger:hover { background-color: #dc2626; box-shadow: 0 8px 20px rgba(239, 68, 68, 0.4); }

.btn-primary-full { width: 100%; font-size: 1rem; }
.actions { display: flex; gap: 1rem; margin-top: 1rem; }
.bimester-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.btn-bim { width: 100%; padding: 1rem 0.5rem; font-size: 0.95rem; background: var(--bg-item); color: var(--text-main); border: 1px solid var(--border-color); border-radius: 12px; }
.btn-bim:hover { background: var(--primary); border-color: var(--primary); color: #fff; }

/* --- FORMULARIOS --- */
input, select { width: 100%; padding: 1rem; margin-bottom: 1.2rem; background: var(--bg-main); border: 1px solid var(--border-color); color: var(--text-main); border-radius: 12px; font-size: 1rem; color-scheme: dark; }
input:focus, select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.2); }
input::placeholder { color: var(--text-muted); }

/* --- MODALES --- */
.modal { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(15, 23, 42, 0.7); backdrop-filter: blur(12px); justify-content: center; align-items: center; z-index: 3000; }
.modal.active { display: flex; animation: fadeIn 0.25s ease-out; }
@keyframes fadeIn { from { opacity: 0; transform: scale(0.95) translateY(10px); } to { opacity: 1; transform: scale(1) translateY(0); } }
.modal-content { background: var(--bg-card); padding: 2.5rem; border-radius: 24px; width: 100%; max-width: 450px; box-shadow: 0 25px 50px rgba(0,0,0,0.5); border: 1px solid var(--border-color); max-height: 90vh; overflow-y: auto; }
.modal-content h3 { margin-bottom: 1.5rem; text-align: center; }

/* --- FULLCALENDAR --- */
.fc .fc-toolbar-title { font-family: 'Poppins', sans-serif; font-size: 1.5em; color: var(--text-main); }
.fc-daygrid-day { cursor: pointer; transition: background 0.2s; }
.fc-daygrid-day:hover { background: var(--bg-item); }
.fc-event { cursor: pointer; padding: 4px 6px; border-radius: 6px; font-weight: 600; border: none !important; font-size: 0.85em; background-color: var(--primary) !important; }

/* --- COLORES NOTAS --- */
.task-item.nota-roja { background-color: rgba(239, 68, 68, 0.15) !important; border-color: #ef4444 !important; }
.task-item.nota-amarilla { background-color: rgba(245, 158, 11, 0.15) !important; border-color: #f59e0b !important; }
.task-item.nota-verde { background-color: rgba(16, 185, 129, 0.15) !important; border-color: #10b981 !important; }
.task-item.nota-roja .task-title { color: #fca5a5; }
.task-item.nota-amarilla .task-title { color: #fde68a; }
.task-item.nota-verde .task-title { color: #a7f3d0; }

/* Modo Claro */
body.light-mode { --bg-main: #f8fafc; --bg-card: #ffffff; --text-main: #1e293b; }

/* --- ACCIONES DE LOS EVENTOS --- */

.event-item {
    gap: 1rem;
}

.event-actions {
    display: flex;
    gap: 0.6rem;
    flex-shrink: 0;
}

.btn-event-edit,
.btn-event-delete {
    width: auto;
    padding: 0.65rem 0.85rem;
    border-radius: 10px;
    font-size: 0.8rem;
}

.btn-event-edit {
    background: var(--primary);
}

.btn-event-edit:hover {
    background: var(--primary-hover);
}

.btn-event-delete {
    background: #ef4444;
}

.btn-event-delete:hover {
    background: #dc2626;
    box-shadow: 0 8px 20px rgba(239, 68, 68, 0.35);
}

/* En pantallas pequeñas coloca los botones abajo */
@media (max-width: 550px) {
    .event-item {
        flex-direction: column;
        align-items: stretch;
    }

    .event-actions {
        width: 100%;
    }

    .btn-event-edit,
    .btn-event-delete {
        flex: 1;
    }
}