/* ========================================================
   Wallpaper Engine - Professional Admin UI CSS
   Theme: Modern Dark & Light Dashboard (Tabler / Inter Style)
   ======================================================== */

:root {
    --bg-main: #0f172a;
    --bg-surface: #1e293b;
    --bg-surface-hover: #334155;
    --bg-card: #1e293b;
    --border-color: #334155;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: rgba(99, 102, 241, 0.15);
    --success: #10b981;
    --success-light: rgba(16, 185, 129, 0.15);
    --warning: #f59e0b;
    --warning-light: rgba(245, 158, 11, 0.15);
    --danger: #ef4444;
    --danger-light: rgba(239, 68, 68, 0.15);
    --info: #0ea5e9;
    --radius: 10px;
    --sidebar-width: 260px;
    --topbar-height: 64px;
    --transition: all 0.2s ease-in-out;
}

[data-theme="light"] {
    --bg-main: #f1f5f9;
    --bg-surface: #ffffff;
    --bg-surface-hover: #f8fafc;
    --bg-card: #ffffff;
    --border-color: #e2e8f0;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --primary: #4f46e5;
    --primary-hover: #4338ca;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.5;
    font-size: 14px;
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-surface);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 100;
    overflow-y: auto;
}

.sidebar-brand {
    padding: 20px 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 18px;
    font-weight: 700;
    color: var(--text-main);
    border-bottom: 1px solid var(--border-color);
    text-decoration: none;
}

.brand-badge {
    background: linear-gradient(135deg, #6366f1, #a855f7);
    color: #fff;
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.5px;
}

.sidebar-menu {
    padding: 16px 12px;
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.menu-header {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    padding: 12px 12px 6px;
    font-weight: 700;
}

.menu-item a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: var(--radius);
    font-weight: 500;
    transition: var(--transition);
}

.menu-item a:hover {
    background-color: var(--bg-surface-hover);
    color: var(--text-main);
}

.menu-item.active a {
    background-color: var(--primary);
    color: #ffffff;
}

.menu-item svg {
    width: 18px;
    height: 18px;
    stroke-width: 2;
}

/* Main Layout */
.main-wrapper {
    margin-left: var(--sidebar-width);
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

/* Topbar */
.topbar {
    height: var(--topbar-height);
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 90;
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.page-title {
    font-size: 20px;
    font-weight: 700;
}

/* Content Container */
.content-body {
    padding: 24px;
    flex: 1;
}

/* Cards & Grid */
.grid-4 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 24px;
    margin-bottom: 24px;
}

.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: 16px;
    font-weight: 600;
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-main);
}

.stat-sub {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    font-size: 12px;
    font-weight: 600;
    border-radius: 9999px;
}

.badge-success { background: var(--success-light); color: var(--success); }
.badge-warning { background: var(--warning-light); color: var(--warning); }
.badge-danger { background: var(--danger-light); color: var(--danger); }
.badge-primary { background: var(--primary-light); color: var(--primary); }
.badge-muted { background: var(--bg-surface-hover); color: var(--text-muted); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius);
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition);
}

.btn-primary {
    background-color: var(--primary);
    color: #fff;
}
.btn-primary:hover { background-color: var(--primary-hover); }

.btn-secondary {
    background-color: var(--bg-surface-hover);
    color: var(--text-main);
    border-color: var(--border-color);
}
.btn-secondary:hover { background-color: var(--border-color); }

.btn-danger {
    background-color: var(--danger);
    color: #fff;
}
.btn-danger:hover { opacity: 0.9; }

.btn-sm {
    padding: 4px 10px;
    font-size: 12px;
}

/* Forms & Inputs */
.form-group {
    margin-bottom: 18px;
}

.form-label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    color: var(--text-main);
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-main);
    font-size: 14px;
    outline: none;
    transition: var(--transition);
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

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

.table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.table th, .table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    background-color: rgba(0,0,0,0.1);
}

.table tbody tr:hover {
    background-color: var(--bg-surface-hover);
}

/* Wallpaper Grid */
.wallpaper-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
}

.wallpaper-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform 0.2s, box-shadow 0.2s;
}

.wallpaper-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.3);
}

.wallpaper-thumb {
    position: relative;
    padding-top: 133%; /* 3:4 aspect ratio */
    background-color: #000;
    overflow: hidden;
}

.wallpaper-thumb img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.wallpaper-info {
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.wallpaper-title {
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Dropzone Upload */
.upload-dropzone {
    border: 2px dashed var(--primary);
    border-radius: var(--radius);
    padding: 40px;
    text-align: center;
    background-color: rgba(99, 102, 241, 0.05);
    cursor: pointer;
    transition: var(--transition);
}

.upload-dropzone.dragover {
    background-color: rgba(99, 102, 241, 0.15);
    border-color: var(--primary-hover);
}

/* Palette Swatches */
.palette-swatches {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 8px;
}

.swatch-item {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    border: 1px solid rgba(255,255,255,0.2);
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    cursor: pointer;
    position: relative;
}

/* Flash alerts */
.alert {
    padding: 14px 18px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.alert-success { background: var(--success-light); color: var(--success); border: 1px solid var(--success); }
.alert-danger { background: var(--danger-light); color: var(--danger); border: 1px solid var(--danger); }
.alert-warning { background: var(--warning-light); color: var(--warning); border: 1px solid var(--warning); }