/* =========================================
   1. VARIABLES DE COLORES (TEMA CLARO)
========================================= */
:root {
    --bg-body: #f4f7f9;
    --primary-slate: #334756;
    --secondary-blue: #2c394b;
    --accent-steel: #082032;
    --soft-blue: #a3bac3;
    --white: #ffffff;
    --text-dark: #1a1a1a;
    --border-color: #e1e8ed;
}

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

body {
    background-color: var(--bg-body);
    color: var(--text-dark);
}

/* =========================================
   2. DISEÑO DE LOGIN Y REGISTRO
   (Se aplica si usas un contenedor o en el body directo)
========================================= */
.card-registro {
    background: var(--white);
    width: 100%;
    max-width: 500px;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.05);
    margin: 40px auto; /* Centrado automático */
}

.header-form { text-align: center; margin-bottom: 30px; }
.header-form h2 { color: var(--accent-steel); font-size: 26px; margin-bottom: 8px; }
.header-form p { color: var(--soft-blue); font-size: 14px; font-weight: 500; }

.row-inputs { display: flex; gap: 15px; margin-bottom: 15px; }
.row-inputs .form-group { flex: 1; }

.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 6px; font-size: 13px; font-weight: 600; color: var(--primary-slate); }

.form-group input, .form-group select {
    width: 100%;
    padding: 12px;
    border: 1.5px solid var(--border-color);
    border-radius: 6px;
    background: #fafbfc;
    font-size: 14px;
    color: var(--text-dark);
    transition: all 0.3s;
}

.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: var(--soft-blue);
    background: #fff;
    box-shadow: 0 0 5px rgba(163, 186, 195, 0.3);
}

.btn-registrar {
    width: 100%; padding: 14px; background-color: var(--primary-slate); color: white;
    border: none; border-radius: 6px; font-size: 16px; font-weight: 600; cursor: pointer; transition: 0.3s; margin-top: 10px;
}
.btn-registrar:hover { background-color: var(--accent-steel); }

.alerta { padding: 12px; border-radius: 6px; margin-bottom: 20px; font-size: 14px; text-align: center; }
.error { background: #fee2e2; color: #b91c1c; border: 1px solid #fecaca; }
.exito { background: #dcfce7; color: #15803d; border: 1px solid #bbf7d0; }

/* =========================================
   3. ESTRUCTURA BASE (PANELES ADMIN/DOCENTE)
========================================= */
.dashboard-container {
    max-width: 1200px; margin: 40px auto; width: 100%; padding: 20px;
}

.header-dashboard {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 30px; border-bottom: 1px solid var(--border-color); padding-bottom: 20px;
}
.header-dashboard h2 { color: var(--primary-slate); }

.grid-panel { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }

.card-modulo {
    background: var(--white); padding: 25px; border-radius: 12px;
    border: 1px solid var(--border-color); box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}
.card-modulo h3 { color: var(--primary-slate); font-size: 16px; margin-bottom: 15px; text-transform: uppercase; }

.btn-salir {
    padding: 10px 20px; background: #ef4444; color: white; text-decoration: none;
    border-radius: 6px; font-weight: bold; transition: 0.3s; display: inline-block;
}
.btn-salir:hover { background: #dc2626; }

/* =========================================
   4. AULA VIRTUAL (CONTENEDORES INTERNOS)
========================================= */
.tabs-tecnicas { display: flex; gap: 10px; margin-bottom: 20px; border-bottom: 2px solid var(--border-color); padding-bottom: 10px; overflow-x: auto; }
.tab-btn { padding: 12px 20px; border: none; background: none; cursor: pointer; color: var(--soft-blue); font-weight: bold; transition: 0.3s; font-size: 15px; white-space: nowrap; }
.tab-btn:hover { color: var(--primary-slate); }
.tab-btn.active { color: var(--primary-slate); border-bottom: 3px solid var(--primary-slate); }

.video-container { width: 100%; aspect-ratio: 16/9; background: #000; border-radius: 12px; overflow: hidden; margin-bottom: 15px; box-shadow: 0 4px 10px rgba(0,0,0,0.1); }
.video-container iframe, .video-container video { width: 100%; height: 100%; border: none; object-fit: cover; }

.grid-learning { display: grid; grid-template-columns: 2fr 1fr; gap: 25px; }
@media (max-width: 900px) { .grid-learning { grid-template-columns: 1fr; } }

.btn-info-detail { background: var(--soft-blue); color: var(--white); padding: 12px 20px; border-radius: 6px; text-decoration: none; font-size: 14px; font-weight: bold; border: none; cursor: pointer; transition: 0.3s; }
.btn-info-detail:hover { background: var(--primary-slate); }

/* =========================================
   5. NAVEGACIÓN SPA Y MENÚ LATERAL
========================================= */
.app-layout { 
    /* Fuerzo a que ocupe el 100% de la pantalla sin importar el body */
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    display: flex; 
    overflow: hidden; 
    background: var(--bg-body); 
}

.sidebar { 
    width: 250px; 
    min-width: 250px;
    background: var(--primary-slate); 
    color: white; 
    display: flex; 
    flex-direction: column; 
    padding-top: 20px; 
    box-shadow: 2px 0 10px rgba(0,0,0,0.1);
    z-index: 10;
}

.sidebar-header { 
    text-align: center; 
    padding: 0 20px 20px 20px; 
    border-bottom: 1px solid rgba(255,255,255,0.1); 
    margin-bottom: 10px; 
}

.sidebar-header h3 { color: var(--soft-blue); font-size: 16px; margin-top: 10px; }

a.menu-btn, button.menu-btn { 
    background: transparent; 
    border: none; 
    color: #a3bac3; 
    padding: 15px 20px; 
    text-align: left; 
    width: 100%; 
    cursor: pointer; 
    font-size: 15px; 
    font-weight: 600; 
    transition: 0.3s; 
    border-left: 4px solid transparent; 
    text-decoration: none; 
    display: block; 
    box-sizing: border-box;
}

.menu-btn i { width: 30px; text-align: center; margin-right: 5px; }
.menu-btn:hover { background: rgba(255,255,255,0.05); color: white; }
.menu-btn.active { background: rgba(255,255,255,0.1); color: white; border-left: 4px solid #10b981; }

.main-content { 
    flex: 1; 
    overflow-y: auto; 
    padding: 40px; 
    background: var(--bg-body);
}

.gui-box { 
    background: white; 
    padding: 25px; 
    border-radius: 8px; 
    box-shadow: 0 4px 6px rgba(0,0,0,0.05); 
    border: 1px solid var(--border-color); 
    margin-bottom: 20px;
}

.gui-textarea { 
    width: 100%; 
    height: 250px; 
    resize: none; 
    font-family: monospace; 
    font-size: 14px;
    padding: 15px; 
    background: #fafbfc; 
    border: 1px solid var(--border-color); 
    border-radius: 6px; 
    margin-top: 15px; 
}

.flex-row { 
    display: flex; 
    gap: 15px; 
    align-items: flex-start; 
}