:root {
    /* Color Palette - Premium Dark Theme */
    --bg-main: #0a0a0f;
    --bg-card: rgba(22, 22, 30, 0.6);
    --border-color: rgba(255, 255, 255, 0.08);
    
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    
    --accent-color: #6366f1;
    --accent-hover: #4f46e5;
    --accent-glow: rgba(99, 102, 241, 0.4);
    
    --danger-color: #ef4444;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    
    --font-main: 'Outfit', sans-serif;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-main);
    color: var(--text-primary);
    min-height: 100vh;
    overflow: hidden;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(99, 102, 241, 0.15), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(139, 92, 246, 0.15), transparent 25%);
}

/* Utilities */
.hidden { display: none !important; }
.flex-center { display: flex; justify-content: center; align-items: center; }
.text-danger { color: var(--danger-color) !important; }
.accent-text { color: var(--accent-color); }
.accent-bg { background-color: var(--accent-color) !important; }
.w-50 { width: 48%; }
.row { display: flex; justify-content: space-between; gap: 1rem; }

/* Glassmorphism Panel */
.glass-panel {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-family: var(--font-main);
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    outline: none;
}

.primary-btn {
    background-color: var(--accent-color);
    color: white;
    box-shadow: 0 4px 15px var(--accent-glow);
}

.primary-btn:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--accent-glow);
}

.secondary-btn {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.secondary-btn:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.2rem;
    transition: var(--transition);
}
.icon-btn:hover { color: var(--text-primary); }
.action-btn { padding: 0.4rem 0.8rem; border-radius: 6px; font-size: 0.85rem; }
.delete-btn { background: rgba(239, 68, 68, 0.1); color: var(--danger-color); }
.delete-btn:hover { background: var(--danger-color); color: white; }

/* Input Groups */
.input-group {
    margin-bottom: 1.5rem;
    position: relative;
    display: flex;
    flex-direction: column;
}

.input-group label {
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.input-group i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.input-group input, .input-group select {
    width: 100%;
    padding: 0.85rem 1rem;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 1rem;
    transition: var(--transition);
}

.input-group input[type="text"]:not([id^="new-"]), 
.input-group input[type="password"]:not([id^="new-"]) {
    padding-left: 2.5rem;
}

.input-group input:focus, .input-group select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.input-group select option { background: var(--bg-main); }

/* Progress Bar */
.progress-bar-bg {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-color), #8b5cf6);
    width: 0%;
    transition: width 0.5s ease-out;
}

/* Screens */
.screen {
    width: 100%;
    height: 100vh;
}

/* Login Screen */
.login-panel {
    width: 100%;
    max-width: 400px;
    padding: 3rem 2.5rem;
    text-align: center;
}

.logo-area {
    margin-bottom: 2.5rem;
}

.logo-area i {
    font-size: 3.5rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
    filter: drop-shadow(0 0 15px var(--accent-glow));
}

.logo-area h2 { font-size: 2rem; font-weight: 700; }
.logo-area p { color: var(--text-secondary); margin-top: 0.2rem; }

#login-form .btn { width: 100%; margin-top: 1rem; }

/* Dashboard layout */
#dashboard-screen {
    display: flex;
}

/* Sidebar */
.sidebar {
    width: 280px;
    height: 100vh;
    border-radius: 0;
    border-top: none;
    border-bottom: none;
    border-left: none;
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 2.5rem;
}

.sidebar-header i { font-size: 1.8rem; }
.sidebar-header h2 { font-size: 1.4rem; font-weight: 600; }

.user-profile {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 12px;
}

.avatar {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-color), #8b5cf6);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.2rem;
    color: white;
}

.user-info h3 { font-size: 1rem; margin-bottom: 0.2rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 120px;}
.badge { font-size: 0.7rem; padding: 0.2rem 0.5rem; background: rgba(255,255,255,0.1); border-radius: 12px; text-transform: uppercase; letter-spacing: 0.5px;}

.quota-container {
    margin-bottom: 2rem;
}
.quota-header { display: flex; justify-content: space-between; font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 0.5rem; }

.sidebar-nav { flex-grow: 1; display: flex; flex-direction: column; gap: 0.5rem; }

.nav-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.8rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 8px;
    transition: var(--transition);
}

.nav-item i { width: 20px; text-align: center; }

.nav-item:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--accent-glow);
    color: var(--text-primary);
    border-right: 3px solid var(--accent-color);
}

/* Main Content */
.main-content {
    flex-grow: 1;
    height: 100vh;
    padding: 2.5rem;
    overflow-y: auto;
}

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

.section-header h1 { font-size: 2rem; font-weight: 600; }

/* Files Grid */
.files-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1.5rem;
}

.file-card {
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    transition: var(--transition);
    cursor: pointer;
}

.file-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
}

.file-icon {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.file-info { flex-grow: 1; overflow: hidden; }
.file-name { font-weight: 500; font-size: 0.95rem; margin-bottom: 0.3rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.file-meta { font-size: 0.8rem; color: var(--text-secondary); }

.file-actions { display: flex; justify-content: space-between; margin-top: 0.5rem; }

.empty-state {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 5rem 0;
    color: var(--text-secondary);
}

.empty-state i { font-size: 4rem; margin-bottom: 1rem; opacity: 0.5; }
.empty-state p { font-size: 1.2rem; margin-bottom: 0.5rem; color: var(--text-primary); }

/* Upload Progress */
.upload-progress-container {
    background: var(--bg-card);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}
.upload-header { display: flex; justify-content: space-between; margin-bottom: 0.5rem; font-size: 0.9rem; }

/* Admin Table */
.table-container { overflow-x: auto; }
.data-table {
    width: 100%;
    border-collapse: collapse;
}
.data-table th, .data-table td {
    padding: 1rem 1.5rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}
.data-table th { font-weight: 500; color: var(--text-secondary); font-size: 0.9rem; }
.data-table tr:hover { background: rgba(255, 255, 255, 0.02); }

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 1;
    transition: opacity 0.3s;
}

.modal-content {
    width: 100%;
    max-width: 500px;
    padding: 2rem;
    transform: translateY(0);
    transition: transform 0.3s;
}

.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.5rem; }
.modal-footer { display: flex; justify-content: flex-end; gap: 1rem; margin-top: 2rem; }

/* Loading overlay */
.loading-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(10, 10, 15, 0.8);
    z-index: 2000;
    display: flex;
    justify-content: center;
    align-items: center;
}

.spinner {
    width: 50px; height: 50px;
    border: 3px solid rgba(255,255,255,0.1);
    border-radius: 50%;
    border-top-color: var(--accent-color);
    animation: spin 1s ease-in-out infinite;
}

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

/* Toast */
.toast {
    position: fixed;
    bottom: 20px; right: 20px;
    padding: 1rem 1.5rem;
    background: var(--bg-card);
    border-left: 4px solid var(--accent-color);
    border-radius: 4px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.5);
    z-index: 3000;
    transform: translateX(120%);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.toast.show { transform: translateX(0); }
.toast.success { border-color: var(--success-color); }
.toast.error { border-color: var(--danger-color); }

/* Responsive */
@media (max-width: 768px) {
    #dashboard-screen { flex-direction: column; }
    .sidebar { width: 100%; height: auto; padding: 1rem; }
    .sidebar-nav { flex-direction: row; flex-wrap: wrap; }
    .sidebar-footer { display: none; }
    .main-content { padding: 1rem; }
}