:root {
    --bg-color: #0d1117;
    --card-bg: rgba(22, 27, 34, 0.7);
    --primary-color: #7c3aed;
    /* Violet */
    --primary-hover: #6d28d9;
    --text-color: #e6edf3;
    --text-muted: #8b949e;
    --border-color: rgba(48, 54, 61, 0.5);
    --glass-border: 1px solid rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --font-main: 'Inter', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    background: radial-gradient(circle at top right, #1e1e3f, #0d1117);
}

/* Glassmorphism Utilities */
.glass-panel {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: var(--glass-border);
    border-radius: 16px;
    box-shadow: var(--glass-shadow);
}

/* Login Page Styles */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    padding: 20px;
    position: relative;
    overflow: hidden;
}

.login-container::before {
    content: '';
    position: absolute;
    top: -100px;
    left: -100px;
    width: 300px;
    height: 300px;
    background: var(--primary-color);
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
    z-index: -1;
}

.login-card {
    width: 100%;
    max-width: 400px;
    padding: 40px;
    text-align: center;
}

.brand-logo {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 30px;
    background: linear-gradient(to right, #a78bfa, #c084fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -1px;
}

.input-group {
    margin-bottom: 20px;
    text-align: left;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.input-group input {
    width: 100%;
    padding: 12px 16px;
    background: rgba(13, 17, 23, 0.5);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-color);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.2);
}

.btn-primary {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(124, 58, 237, 0.4);
}

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

.sidebar {
    width: 280px;
    background: rgba(13, 17, 23, 0.95);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
}

.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-menu {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.menu-item {
    display: block;
    padding: 12px 16px;
    margin-bottom: 8px;
    border-radius: 8px;
    color: var(--text-muted);
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
}

.menu-item:hover,
.menu-item.active {
    background: rgba(124, 58, 237, 0.1);
    color: var(--primary-color);
}

.main-content {
    flex: 1;
    margin-left: 280px;
    padding: 40px;
}

.video-player-container {
    width: 100%;
    aspect-ratio: 16/9;
    background: #000;
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 24px;
    position: relative;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.video-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(45deg, #1f2937, #111827);
    color: var(--text-muted);
    font-size: 1.2rem;
}

.content-header h1 {
    font-size: 2rem;
    margin-bottom: 10px;
}

.resources-section {
    margin-top: 40px;
}

.resource-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px;
    margin-top: 16px;
}

.file-info {
    display: flex;
    align-items: center;
    gap: 16px;
}

.file-icon {
    width: 40px;
    height: 40px;
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.download-btn {
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.download-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--text-muted);
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* Mobile Responsiveness */
.mobile-header {
    display: none;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    background: rgba(13, 17, 23, 0.95);
    border-bottom: 1px solid var(--border-color);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 110;
    backdrop-filter: blur(10px);
}

.mobile-menu-btn {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    padding: 4px;
}

.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 90;
    backdrop-filter: blur(2px);
    opacity: 0;
    transition: opacity 0.3s ease;
}

@media (max-width: 768px) {
    .mobile-header {
        display: flex;
    }

    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        width: 260px;
        z-index: 120;
    }

    .sidebar.active {
        transform: translateX(0);
        box-shadow: 0 0 50px rgba(0, 0, 0, 0.5);
    }

    .sidebar-overlay.active {
        display: block;
        opacity: 1;
    }

    .main-content {
        margin-left: 0;
        padding: 20px;
        padding-top: 80px;
        /* Account for mobile header */
    }

    .sidebar-header {
        display: none;
        /* Already in mobile header */
    }

    .video-player-container {
        border-radius: 8px;
    }
}

/* Access Control Styles */
.locked-item {
    opacity: 0.5;
    filter: grayscale(100%);
    cursor: not-allowed !important;
    position: relative;
    pointer-events: auto;
}

.locked-item:hover {
    background: none !important;
    color: var(--text-muted) !important;
}

.lock-icon {
    margin-left: auto;
    font-size: 0.9rem;
}