:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg-dark: #0f172a;
    --bg-panel: rgba(30, 41, 59, 0.7);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border: rgba(255, 255, 255, 0.1);
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --success: #10b981;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Backgrounds */
.login-bg {
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at top left, #1e1b4b, #0f172a);
}

.dashboard-bg {
    display: flex;
    background: radial-gradient(circle at bottom right, #1e1b4b, #0f172a);
    height: 100vh;
    overflow: hidden;
}

/* Glassmorphism Panels */
.glass-panel {
    background: var(--bg-panel);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

/* Login Container */
.login-container {
    width: 100%;
    max-width: 400px;
    padding: 40px;
    animation: fadeIn 0.5s ease-out;
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h2 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
    background: linear-gradient(to right, #818cf8, #c084fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.login-header p {
    color: var(--text-muted);
    font-size: 14px;
}

/* Forms */
.input-group {
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
}

.input-group label {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 8px;
    font-weight: 500;
}

input[type="text"],
input[type="password"],
select {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    transition: all 0.3s;
    outline: none;
}

input[type="text"]:focus,
input[type="password"]:focus,
select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 20px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.3s;
    text-align: center;
    font-family: inherit;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

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

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

.btn-danger {
    background-color: var(--danger);
    color: white;
    padding: 6px 12px;
}

.btn-danger:hover {
    background-color: var(--danger-hover);
}

.btn-block {
    width: 100%;
}

.btn-icon {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 18px;
    transition: color 0.2s;
    padding: 8px;
}

.btn-icon:hover {
    color: var(--text-main);
}

.error-msg {
    color: #fca5a5;
    font-size: 13px;
    margin-bottom: 15px;
    text-align: center;
    min-height: 20px;
}

/* Sidebar */
.sidebar {
    width: 260px;
    border-radius: 0;
    border-top: none;
    border-bottom: none;
    border-left: none;
    display: flex;
    flex-direction: column;
    z-index: 10;
}

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

.sidebar-header h3 {
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-menu {
    list-style: none;
    padding: 20px 0;
    flex: 1;
}

.nav-menu li a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 24px;
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s;
}

.nav-menu li a:hover, .nav-menu li.active a {
    color: var(--text-main);
    background: rgba(255,255,255,0.03);
    border-right: 3px solid var(--primary);
}

.user-info {
    padding: 20px 24px;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-info .avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
}

.user-info .details {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.user-info .name {
    font-weight: 600;
    font-size: 14px;
}

.user-info .role {
    font-size: 12px;
    color: var(--text-muted);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 30px;
    overflow-y: auto;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.breadcrumb {
    display: flex;
    gap: 8px;
    font-size: 18px;
    font-weight: 600;
    align-items: center;
}

.breadcrumb a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
    cursor: pointer;
}

.breadcrumb a:hover {
    color: var(--text-main);
}

.breadcrumb .separator {
    color: var(--border);
}

/* File Grid */
.file-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 20px;
}

.file-item {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
}

.file-item:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: 0 8px 24px rgba(0,0,0,0.3);
}

.file-item i.icon {
    font-size: 48px;
    margin-bottom: 15px;
    display: block;
}

.file-item.dir i.icon {
    color: #fbbf24; /* Yellow folder */
}

.file-item.file i.icon {
    color: #94a3b8; /* Gray file */
}

.file-item .name {
    font-size: 13px;
    font-weight: 500;
    word-break: break-all;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.file-item .actions-menu {
    position: absolute;
    top: 8px;
    right: 8px;
    opacity: 0;
    transition: opacity 0.2s;
}

.file-item:hover .actions-menu {
    opacity: 1;
}

.file-item .btn-delete {
    background: rgba(239, 68, 68, 0.2);
    color: #fca5a5;
    border: none;
    border-radius: 4px;
    padding: 4px 8px;
    cursor: pointer;
}
.file-item .btn-delete:hover {
    background: var(--danger);
    color: white;
}

.file-item .btn-download {
    background: rgba(16, 185, 129, 0.2);
    color: #34d399;
    border: none;
    border-radius: 4px;
    padding: 4px 8px;
    cursor: pointer;
    margin-right: 5px;
}
.file-item .btn-download:hover {
    background: var(--success);
    color: white;
}

.loading {
    grid-column: 1 / -1;
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}

/* Admin Tables */
.table-container {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th, .data-table td {
    padding: 15px 20px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.data-table th {
    font-weight: 600;
    color: var(--text-muted);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.data-table tr:hover td {
    background: rgba(255,255,255,0.02);
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(4px);
    z-index: 100;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
    animation: fadeIn 0.2s ease-out;
}

.modal-content {
    width: 100%;
    max-width: 450px;
    animation: slideUp 0.3s ease-out;
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-weight: 600;
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    padding: 20px 24px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

/* Drag & Drop Overlay */
.drop-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(99, 102, 241, 0.9);
    backdrop-filter: blur(5px);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s;
    pointer-events: none;
}

.drop-overlay.active {
    opacity: 1;
    visibility: visible;
}

.drop-overlay i {
    font-size: 64px;
    margin-bottom: 20px;
}

.drop-overlay h2 {
    font-size: 32px;
    font-weight: 600;
}