:root {
    --primary: #c5a059;
    --primary-dark: #a68545;
    --bg-dark: #0f0f0f;
    --surface: #1a1a1a;
    --surface-light: #2a2a2a;
    --text-main: #f9f4ef;
    --text-muted: #a0a0a0;
    --coffee: #2d1b0d;
    --accent: #d4af37;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(197, 160, 89, 0.5); /* var(--primary) com transparência */
}

/* Glassmorphism Effects */
.glass {
    background: rgba(26, 26, 26, 0.8);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
}

/* Auth Pages */
.auth-container {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at top right, var(--coffee), transparent),
                radial-gradient(circle at bottom left, #1a1a1a, transparent);
}

.auth-card {
    width: 100%;
    max-width: 400px;
    padding: 40px;
    animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.auth-logo {
    text-align: center;
    margin-bottom: 30px;
}

.auth-logo h1 {
    color: var(--primary);
    font-size: 24px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    color: var(--text-muted);
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    background: var(--surface-light);
    border: 1px solid transparent;
    border-radius: 8px;
    color: var(--text-main);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--surface);
    box-shadow: 0 0 0 4px rgba(197, 160, 89, 0.1);
}

.btn-primary {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border: none;
    border-radius: 8px;
    color: #000;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(197, 160, 89, 0.2);
}

/* Dashboard Layout */
.dashboard-layout {
    display: grid;
    grid-template-columns: 260px 1fr;
    min-height: 100vh;
}

.sidebar {
    background: var(--surface);
    border-right: 1px solid rgba(255, 255, 255, 0.05);
    padding: 30px 20px;
}

.main-content {
    padding: 40px;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: 8px;
    margin-bottom: 8px;
    transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
    background: rgba(197, 160, 89, 0.1);
    color: var(--primary);
}

/* Course Cards */
.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.course-card {
    background: var(--surface);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.course-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary);
}

.course-thumb {
    height: 180px;
    background: var(--surface-light);
    position: relative;
}

.course-info {
    padding: 20px;
}

.course-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
}

.course-meta {
    font-size: 14px;
    color: var(--text-muted);
}

/* ─── Mobile Styles (Responsive) ─── */
.mobile-header {
    display: none;
    background: var(--surface);
    padding: 16px 20px;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    position: sticky;
    top: 0;
    z-index: 99;
}

.mobile-header h1 {
    font-size: 18px;
    font-weight: 800;
    color: var(--primary);
}
.mobile-header h1 span { color: #fff; }

.btn-mobile-menu {
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 24px;
    cursor: pointer;
}

/* Grids customizadas */
.profile-grid {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 24px;
    align-items: start;
}

.lesson-grid {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 24px;
    align-items: start;
}

@media (max-width: 1024px) {
    .dashboard-layout {
        display: flex;
        flex-direction: column;
    }

    .mobile-header {
        display: flex;
    }

    .sidebar {
        position: fixed !important;
        top: 0 !important;
        left: -100%;
        width: 280px;
        height: 100vh !important;
        z-index: 1000;
        transition: left 0.3s ease;
        background: var(--bg-dark);
        box-shadow: 4px 0 20px rgba(0,0,0,0.5);
    }

    .sidebar.mobile-open {
        left: 0;
    }

    .sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.6);
        z-index: 999;
        backdrop-filter: blur(4px);
    }
    
    .sidebar-overlay.mobile-open {
        display: block;
    }

    .main-content {
        padding: 20px 16px;
    }

    .main-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }

    .course-grid {
        grid-template-columns: 1fr;
    }

    .admin-table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }

    .profile-grid {
        grid-template-columns: 1fr;
    }

    .lesson-grid {
        grid-template-columns: 1fr;
    }
}