/* Variables de Color */
:root {
    --primary-color: #4CAF50; /* Verde */
    --secondary-color: #2196F3; /* Azul */
    --accent-color: #FFC107; /* Amarillo */
    --background-light: #f4f7f6;
    --text-light: #333;
    --card-bg-light: #ffffff;
    --border-light: #e0e0e0;

    --background-dark: #2c3e50; /* Azul oscuro */
    --text-dark: #ecf0f1; /* Blanco */
    --card-bg-dark: #34495e; /* Gris oscuro */
    --border-dark: #4f6272;

    --sidebar-width: 250px;
    --navbar-height: 60px;
    --transition-speed: 0.3s;
}

/* Modo Claro (Default) */
body {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    background-color: var(--background-light);
    color: var(--text-light);
    display: flex;
    min-height: 100vh;
    overflow-x: hidden; /* Previene scroll horizontal */
}

.app-container {
    display: flex;
    width: 100%;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--card-bg-light);
    color: var(--text-light);
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    transition: width var(--transition-speed) ease;
    box-shadow: 2px 0 10px rgba(0,0,0,0.05);
}

.sidebar-header {
    padding: 20px;
    text-align: center;
    border-bottom: 1px solid var(--border-light);
    margin-bottom: 20px;
}
.sidebar-header i {
    font-size: 2.5em;
    color: var(--primary-color);
    margin-bottom: 10px;
}
.sidebar-header h2 {
    margin: 0;
    font-weight: 600;
    font-size: 1.6em;
}

.sidebar nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar nav li {
    padding: 15px 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 15px;
    font-size: 1.1em;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    border-left: 3px solid transparent;
}

.sidebar nav li:hover {
    background-color: #f0f2f5; /* Gris muy claro */
}

.sidebar nav li.active {
    background-color: var(--primary-color);
    color: white;
    border-left-color: var(--primary-color);
}

.sidebar nav li i {
    font-size: 1.2em;
    width: 25px; /* Para alinear íconos */
    text-align: center;
}

/* Navbar */
.navbar {
    height: var(--navbar-height);
    background-color: var(--card-bg-light);
    border-bottom: 1px solid var(--border-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.navbar-left button.btn-toggle-sidebar {
    background: none;
    border: none;
    font-size: 1.8em;
    color: var(--text-light);
    cursor: pointer;
    margin-right: 15px;
    padding: 5px;
}

.navbar-left span#current-title {
    font-size: 1.4em;
    font-weight: 600;
    color: var(--primary-color);
}

.navbar-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

.navbar-right .btn-theme-toggle {
    background: none;
    border: none;
    font-size: 1.5em;
    color: var(--text-light);
    cursor: pointer;
    padding: 8px;
}

.profile-menu {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    cursor: pointer;
}

.profile-menu i {
    font-size: 0.8em;
}

/* Main Content */
.main-content {
    flex-grow: 1;
    padding: 20px;
    overflow-y: auto; /* Permite scroll si el contenido es largo */
    transition: margin-left var(--transition-speed) ease; /* Para la animación de sidebar */
}

.section {
    display: none; /* Ocultar todas las secciones por defecto */
    animation: fadeIn var(--transition-speed) ease; /* Animación de aparición */
}

.section.active {
    display: block; /* Mostrar la sección activa */
}

/* Formularios */
#setup-form .form-group {
    margin-bottom: 15px;
}

#setup-form label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
}

#setup-form input[type="text"],
#setup-form input[type="password"],
#setup-form input[type="email"] {
    width: calc(100% - 20px); /* Ajuste para padding */
    padding: 10px;
    border: 1px solid var(--border-light);
    border-radius: 5px;
    font-size: 1em;
    font-family: 'Poppins', sans-serif;
}

#setup-form input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(76, 175, 80, 0.2);
}

/* Botones */
.btn-primary {
    background-color: var(--primary-color);
    color: white;
    padding: 12px 25px;
    border: none;
    border-radius: 5px;
    font-size: 1.1em;
    cursor: pointer;
    transition: background-color var(--transition-speed);
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
}
.btn-primary:hover {
    background-color: #3e8e41;
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    font-size: 1em;
    cursor: pointer;
    transition: background-color var(--transition-speed);
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    margin-top: 10px; /* Espacio si se usa para agregar elementos */
}
.btn-secondary:hover {
    background-color: #1e88e5;
}

.btn-danger {
    background-color: #f44336; /* Rojo */
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    font-size: 1em;
    cursor: pointer;
    transition: background-color var(--transition-speed);
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
}
.btn-danger:hover {
    background-color: #da190b;
}

/* Animación de fadeIn */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Responsiveness */
@media (max-width: 768px) {
    .sidebar {
        width: 60px; /* Colapsado en móvil */
        overflow: hidden;
    }
    .sidebar-header h2, .sidebar nav li span {
        display: none; /* Ocultar texto cuando está colapsado */
    }
    .sidebar nav li {
        justify-content: center;
        padding: 15px 10px;
    }
    .sidebar nav li i {
        margin-right: 0;
    }

    .main-content {
        padding: 15px;
    }
    .navbar {
        padding: 0 15px;
    }
    .navbar-left span#current-title {
        font-size: 1.2em;
    }
    .profile-menu span {
        display: none; /* Ocultar nombre en móvil si no hay espacio */
    }
    .btn-toggle-sidebar {
        font-size: 1.5em;
    }

    /* Ajustes para el modo colapsado */
    .sidebar-collapsed .sidebar {
        width: 60px;
    }
    .sidebar-collapsed .main-content {
        margin-left: 60px;
    }
}

/* Tablas de Calificaciones */
.course-table-container {
    overflow-x: auto; /* Permite scroll horizontal si la tabla es ancha */
    margin-top: 20px;
}

.course-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}

.course-table th, .course-table td {
    border: 1px solid var(--border-light);
    padding: 10px 12px;
    text-align: left;
    min-width: 120px; /* Ancho mínimo para celdas */
}

.course-table th {
    background-color: #e8eef2; /* Gris claro para encabezados */
    font-weight: 600;
    color: var(--text-light);
}

.course-table input[type="text"] {
    width: 90%;
    padding: 8px;
    border: 1px solid var(--border-light);
    border-radius: 4px;
    font-family: 'Poppins', sans-serif;
    box-sizing: border-box; /* Incluye padding y border en el width */
}
.course-table input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(76, 175, 80, 0.2);
}

.course-table .btn-table-action {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.1em;
    margin-right: 5px;
    padding: 5px;
}

.btn-table-action.edit { color: var(--secondary-color); }
.btn-table-action.delete { color: #f44336; }
.btn-table-action.save { color: var(--primary-color); }
.btn-table-action.cancel { color: #777; }

/* Estilos para la sección de Instituciones y Cursos */
.institution-card {
    background-color: var(--card-bg-light);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.institution-card h3 {
    color: var(--primary-color);
    margin-top: 0;
    margin-bottom: 15px;
    border-bottom: 1px solid var(--border-light);
    padding-bottom: 10px;
}

.course-item {
    margin-bottom: 15px;
    padding: 15px;
    background-color: #f9f9f9;
    border-radius: 5px;
    border: 1px solid #eee;
}

.course-item h4 {
    margin: 0 0 10px 0;
    color: var(--text-light);
    font-size: 1.1em;
}

.course-actions {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

.course-actions .btn-secondary { margin-top: 0; }

/* Estilos para Gráficos (placeholder) */
#charts-container canvas {
    max-width: 100%;
    height: auto;
}

/* Estilos para Perfil y Configuración */
.settings-options, .profile-details {
    background-color: var(--card-bg-light);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.settings-options h3, .profile-details h3 {
    color: var(--primary-color);
    margin-top: 0;
    margin-bottom: 15px;
    border-bottom: 1px solid var(--border-light);
    padding-bottom: 10px;
}

.settings-options button, .profile-details div {
    margin-bottom: 10px;
}

/* Estilos de Placeholder para Celdas de Calificaciones */
.grade-input-placeholder {
    color: #aaa;
    font-style: italic;
}

/* Estilos para el modo oscuro */
body.dark-mode {
    --background-light: var(--background-dark);
    --text-light: var(--text-dark);
    --card-bg-light: var(--card-bg-dark);
    --border-light: var(--border-dark);
}

body.dark-mode .sidebar {
    background-color: var(--card-bg-dark);
    border-right-color: var(--border-dark);
    color: var(--text-dark);
}
body.dark-mode .sidebar-header { border-bottom-color: var(--border-dark); }
body.dark-mode .sidebar nav li { color: var(--text-dark); }
body.dark-mode .sidebar nav li:hover { background-color: #415060; }
body.dark-mode .sidebar nav li.active { border-left-color: var(--primary-color); } /* primary-color se mantiene */
body.dark-mode .sidebar nav li.active i { color: white; }

body.dark-mode .navbar {
    background-color: var(--card-bg-dark);
    border-bottom-color: var(--border-dark);
    color: var(--text-dark);
}
body.dark-mode .navbar-left button.btn-toggle-sidebar { color: var(--text-dark); }
body.dark-mode .navbar-left span#current-title { color: var(--primary-color); } /* primary-color se mantiene */
body.dark-mode .navbar-right .btn-theme-toggle { color: var(--text-dark); }
body.dark-mode .profile-menu { color: var(--text-dark); }

body.dark-mode .section { background-color: transparent; } /* El background ya está en body */

body.dark-mode input[type="text"],
body.dark-mode input[type="password"],
body.dark-mode input[type="email"] {
    background-color: var(--card-bg-dark);
    border-color: var(--border-dark);
    color: var(--text-dark);
}
body.dark-mode input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(76, 175, 80, 0.5); /* Ajuste de opacidad para modo oscuro */
}

body.dark-mode .btn-primary { background-color: var(--primary-color); }
body.dark-mode .btn-primary:hover { background-color: #3e8e41; }
body.dark-mode .btn-secondary { background-color: var(--secondary-color); }
body.dark-mode .btn-secondary:hover { background-color: #1e88e5; }

body.dark-mode .course-table { border-color: var(--border-dark); }
body.dark-mode .course-table th, body.dark-mode .course-table td {
    border-color: var(--border-dark);
    background-color: var(--card-bg-dark);
    color: var(--text-dark);
}
body.dark-mode .course-table th { background-color: #3a4a5c; } /* Gris más oscuro para encabezado */
body.dark-mode .course-table input[type="text"] {
    background-color: var(--card-bg-dark);
    border-color: var(--border-dark);
    color: var(--text-dark);
}

body.dark-mode .institution-card,
body.dark-mode .course-item,
body.dark-mode .settings-options,
body.dark-mode .profile-details {
    background-color: var(--card-bg-dark);
    border-color: var(--border-dark);
    box-shadow: 0 2px 8px rgba(0,0,0,0.2); /* Sombra más visible */
}
body.dark-mode .institution-card h3,
body.dark-mode .settings-options h3,
body.dark-mode .profile-details h3 {
    color: var(--primary-color);
    border-bottom-color: var(--border-dark);
}
body.dark-mode .course-item { background-color: #3a4a5c; border-color: #4f6272; }
body.dark-mode .course-item h4 { color: var(--text-dark); }

body.dark-mode .btn-table-action.edit { color: var(--secondary-color); }
body.dark-mode .btn-table-action.delete { color: #f44336; } /* Rojo se mantiene */
body.dark-mode .btn-table-action.save { color: var(--primary-color); }
body.dark-mode .btn-table-action.cancel { color: #bbb; }