/* LMS Premium - Main Stylesheet */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&display=swap');

:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --secondary: #64748b;
    --accent: #f43f5e;
    --success: #10b981;
    --warning: #f59e0b;
    --neutral-50: #f8fafc;
    --neutral-100: #f1f5f9;
    --neutral-200: #e2e8f0;
    --neutral-300: #cbd5e1;
    --neutral-800: #1e293b;
    --neutral-900: #0f172a;
    --surface: #ffffff;
    --text-main: #334155;
    --text-muted: #64748b;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    
    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    background-color: var(--neutral-100);
    color: var(--text-main);
    line-height: 1.5;
}

/* Layout */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background-color: var(--neutral-900);
    color: white;
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
}

.sidebar-logo {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--primary);
}

.nav-menu {
    list-style: none;
    flex-grow: 1;
}

.nav-item {
    margin-bottom: 0.5rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1rem;
    color: var(--neutral-300);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
}

.nav-link.active {
    background-color: var(--primary);
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 280px;
    padding: 2rem;
}

/* Header */
.top-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: white;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    box-shadow: var(--shadow-sm);
}

/* Cards */
.card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    margin-bottom: 2rem;
    border: 1px solid var(--neutral-200);
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

/* Dashboard Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: white;
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    gap: 1.25rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--neutral-200);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-info h3 {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
}

.stat-info p {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--neutral-900);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    gap: 0.5rem;
}

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-2px); }

.btn-outline { background: transparent; border: 1px solid var(--neutral-300); color: var(--text-main); }
.btn-outline:hover { background: var(--neutral-100); }

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--neutral-800);
}

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--neutral-300);
    outline: none;
    transition: var(--transition);
}

.form-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

/* Exam Timer & Progress */
.timer-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 8px;
    background: var(--neutral-200);
    z-index: 1000;
}

.timer-fill {
    height: 100%;
    background: var(--primary);
    width: 100%;
    transition: width 1s linear;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade {
    animation: fadeIn 0.5s ease forwards;
}

/* Responsive */
@media (max-width: 1024px) {
    .sidebar { width: 80px; padding: 2rem 0.75rem; }
    .sidebar-logo span { display: none; }
    .nav-link span { display: none; }
    .main-content { margin-left: 80px; }
}

/* Responsive Tables */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    width: 100%;
}

@media (max-width: 640px) {
    .sidebar {
        width: 100%;
        height: 65px;
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        padding: 0 5px;
        bottom: 0;
        top: auto;
        left: 0;
        box-shadow: 0 -4px 10px rgba(0,0,0,0.3);
    }
    .sidebar-logo { display: none; }
    
    .nav-menu {
        display: flex;
        flex-direction: row;
        justify-content: space-around;
        align-items: center;
        width: 100%;
    }
    .nav-item { margin: 0; }
    .nav-link { padding: 0.75rem; justify-content: center; gap: 0; }
    .nav-link span { display: none; }

    .sidebar-footer { 
        border-top: none !important;
        padding: 0 !important;
        margin: 0 !important;
        display: flex;
        align-items: center;
    }
    .sidebar-footer > a:first-child { display: none !important; } /* Ocultar perfil en móvil */
    .sidebar-footer .nav-link { padding: 0.75rem; margin-bottom: 0;}
    
    .main-content { margin-left: 0; padding: 1rem; padding-bottom: 85px; }
}