/**
 * ARCHIVO: css/style.css
 * DESCRIPCIÓN: Framework UI del ecosistema universitario 2026 (Versión Responsive Premium).
 * Integra Glassmorphism, Neomorphism adaptativo y Media Queries optimizados para Android y PC.
 * AUTOR: Senior Full Stack Developer
 */

/* ==========================================================================
   1. VARIABLES DE ENTORNO Y CONFIGURACIÓN DE TEMAS (DARK/LIGHT)
   ========================================================================== */
:root {
    --font-primary: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --transition-fluid: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius-lg: 16px;
    --border-radius-md: 12px;
    --border-radius-sm: 8px;
    --shadow-premium: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    
    /* Configuración por defecto: Dark Mode Glassmorphism */
    --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.08);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent-primary: #4f46e5;
    --accent-hover: #6366f1;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --input-bg: rgba(15, 23, 42, 0.6);
}

[data-theme="light"] {
    --bg-gradient: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    --glass-bg: rgba(255, 255, 255, 0.75);
    --glass-border: rgba(0, 0, 0, 0.06);
    --text-main: #0f172a;
    --text-muted: #64748b;
    --accent-primary: #4f46e5;
    --accent-hover: #3730a3;
    --success: #059669;
    --danger: #dc2626;
    --warning: #d97706;
    --input-bg: rgba(255, 255, 255, 0.9);
    --shadow-premium: 0 8px 32px 0 rgba(31, 38, 135, 0.08);
}

/* ==========================================================================
   2. REINICIO DE ESTILOS Y ARQUITECTURA BASE
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-gradient);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    transition: var(--transition-fluid);
}

/* Scrollbar Personalizado */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--accent-primary);
}

/* ==========================================================================
   3. COMPONENTES DE DISEÑO NATIVOS (GLASSMORPHISM)
   ========================================================================== */
.glass-container {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-premium);
    transition: var(--transition-fluid);
}

.interactive-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-md);
    padding: 20px;
    transition: var(--transition-fluid);
}
.interactive-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-primary);
    box-shadow: 0 12px 24px rgba(0,0,0,0.2);
}

/* Form Estructuras */
.form-group {
    position: relative;
    margin-bottom: 20px;
    width: 100%;
}

.form-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 6px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    background: var(--input-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-sm);
    color: var(--text-main);
    font-size: 1rem;
    outline: none;
    transition: var(--transition-fluid);
}
.form-input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.25);
}

/* Botones Premium */
.btn-primary {
    width: 100%;
    padding: 14px;
    background: var(--accent-primary);
    color: #ffffff;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fluid);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
}
.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
}

/* Loader global */
.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: var(--bg-gradient);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.5s ease, visibility 0.5s;
}
.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--glass-border);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s infinite linear;
}

/* Notificaciones Toast */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.toast {
    background: var(--glass-bg);
    border-left: 4px solid var(--accent-primary);
    padding: 16px 24px;
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-premium);
    backdrop-filter: blur(10px);
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 12px;
    transform: translateX(120%);
    animation: slideIn 0.3s forwards cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* Layouts de Bienvenida (Index) */
.welcome-wrapper {
    width: 95%;
    max-width: 500px;
    padding: 40px;
    text-align: center;
}
.welcome-logo { width: 80px; height: 80px; margin-bottom: 20px; }
.welcome-title { font-size: 2rem; font-weight: 700; margin-bottom: 10px; }
.welcome-tagline { color: var(--text-muted); margin-bottom: 30px; font-size: 1rem; }
.welcome-actions { display: flex; flex-direction: column; gap: 15px; }
.btn-secondary { width: 100%; padding: 14px; background: transparent; color: var(--text-main); border: 1px solid var(--glass-border); border-radius: var(--border-radius-sm); font-size: 1rem; font-weight: 600; cursor: pointer; transition: var(--transition-fluid); }
.btn-secondary:hover { background: var(--glass-border); }

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes slideIn { to { transform: translateX(0); } }

/* ==========================================================================
   4. INGENIERÍA RESPONSIVE: CRÍTICA PARA ANDROID / CELULARES
   ========================================================================== */
@media (max-width: 768px) {
    /* Ajustes generales de cuerpo */
    body {
        align-items: flex-start;
    }
    
    /* El Layout pasa de fila (PC) a columna (Celular) */
    .dashboard-layout {
        flex-direction: column;
        overflow-y: auto;
        height: auto;
    }

    /* Convertir el Sidebar en un menú superior colapsado o barra compacta */
    .sidebar {
        width: 100% !important;
        height: auto !important;
        border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg) !important;
        padding: 16px !important;
    }
    
    .sidebar-menu {
        flex-direction: row !important;
        overflow-x: auto; /* Desplazamiento horizontal de botones en Android */
        padding-bottom: 5px;
        margin-top: 15px !important;
        gap: 12px !important;
    }
    
    .sidebar-menu::-webkit-scrollbar {
        height: 2px;
    }

    .menu-item a {
        padding: 8px 12px !important;
        white-space: nowrap; /* Evita que el texto se rompa en dos líneas */
        font-size: 0.85rem;
    }
    
    .sidebar-brand {
        font-size: 1.1rem;
        padding-bottom: 10px !important;
    }
    
    .sidebar-footer {
        display: none; /* Ocultar el botón de cerrar sesión gigante abajo */
    }

    /* Ajustar el espacio de trabajo principal */
    .main-content {
        padding: 20px !important;
        width: 100%;
        overflow-y: visible !important;
    }
    
    .main-header {
        flex-direction: column-reverse;
        align-items: flex-start;
        gap: 15px;
    }
    
    .profile-badge {
        width: 100%;
        justify-content: space-between;
        background: rgba(255,255,255,0.03);
        padding: 10px;
        border-radius: var(--border-radius-sm);
    }

    /* Forzar rejillas a una sola columna en Android */
    .stats-grid, .dashboard-details, .calculator-grid, .semester-grid, .schedule-interface {
        grid-template-columns: 1fr !important;
        gap: 15px !important;
    }

    .welcome-wrapper {
        padding: 24px;
        margin: 10px;
    }
    
    .welcome-title {
        font-size: 1.6rem;
    }
}