/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --sidebar-width: 240px;
    --sidebar-bg: #0f1117;
    --sidebar-border: #1e2130;
    --brand-color: #e63946;
    --accent: #e63946;
    --accent-hover: #c1121f;
    --accent-light: rgba(230, 57, 70, 0.12);
    --bg-main: #141720;
    --bg-card: #1a1d2e;
    --bg-card-hover: #1f2338;
    --border: #252840;
    --text-primary: #e8eaf6;
    --text-secondary: #8892b0;
    --text-muted: #4a5568;
    --success: #43a047;
    --success-bg: rgba(67, 160, 71, 0.12);
    --warning: #fb8c00;
    --warning-bg: rgba(251, 140, 0, 0.12);
    --info: #1e88e5;
    --info-bg: rgba(30, 136, 229, 0.12);
    --radius: 10px;
    --radius-sm: 6px;
    --shadow: 0 4px 24px rgba(0,0,0,0.35);
    --transition: 0.2s ease;
}

html, body {
    height: 100%;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    font-size: 14px;
    background: var(--bg-main);
    color: var(--text-primary);
}

/* ===== Layout ===== */
.layout {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* ===== Sidebar ===== */
.sidebar {
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    border-right: 1px solid var(--sidebar-border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: width var(--transition);
    overflow: hidden;
    z-index: 100;
}

.layout.sidebar-collapsed .sidebar {
    width: 64px;
}
.layout.sidebar-collapsed .sidebar span,
.layout.sidebar-collapsed .sidebar-footer span {
    display: none;
}
.layout.sidebar-collapsed .sidebar-brand {
    justify-content: center;
    padding: 0 0 0 0;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 22px 20px;
    border-bottom: 1px solid var(--sidebar-border);
    white-space: nowrap;
    overflow: hidden;
}

.sidebar-brand span {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.5px;
}

.brand-icon {
    color: var(--brand-color);
    font-size: 22px;
    flex-shrink: 0;
}

.sidebar-nav {
    flex: 1;
    padding: 16px 0;
    overflow-y: auto;
}

.sidebar-nav ul {
    list-style: none;
}

.sidebar-nav li {
    padding: 2px 10px;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 14px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 13.5px;
    font-weight: 500;
    transition: background var(--transition), color var(--transition);
    white-space: nowrap;
    overflow: hidden;
}

.sidebar-nav a i {
    font-size: 15px;
    width: 18px;
    text-align: center;
    flex-shrink: 0;
}

.sidebar-nav a:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.sidebar-nav a.active {
    background: var(--accent-light);
    color: var(--accent);
    font-weight: 600;
}

.sidebar-nav a.active i {
    color: var(--accent);
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--sidebar-border);
    color: var(--text-muted);
    font-size: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
    overflow: hidden;
}

.status-dot {
    color: var(--success);
    font-size: 8px;
}

/* ===== Main ===== */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* ===== Topbar ===== */
.topbar {
    height: 60px;
    background: var(--sidebar-bg);
    border-bottom: 1px solid var(--sidebar-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 28px;
    flex-shrink: 0;
}

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

.sidebar-toggle {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    width: 34px;
    height: 34px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.sidebar-toggle:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.page-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.badge {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 12px;
    display: flex;
    align-items: center;
    gap: 6px;
}

/* ===== Content ===== */
.content {
    flex: 1;
    overflow-y: auto;
    padding: 28px;
}

/* ===== Cards ===== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border);
}

.card-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.card-title i {
    color: var(--accent);
}

/* ===== Upload Zone ===== */
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 48px 24px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
    position: relative;
}

.upload-zone:hover, .upload-zone.drag-over {
    border-color: var(--accent);
    background: var(--accent-light);
}

.upload-zone input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
    width: 100%;
    height: 100%;
}

.upload-icon {
    font-size: 40px;
    color: var(--text-muted);
    margin-bottom: 14px;
}

.upload-zone:hover .upload-icon {
    color: var(--accent);
}

.upload-zone p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 6px;
}

.upload-zone small {
    color: var(--text-muted);
    font-size: 12px;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 18px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    text-decoration: none;
    transition: all var(--transition);
    white-space: nowrap;
}

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

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

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

.btn-danger {
    background: rgba(198, 40, 40, 0.15);
    color: #ef5350;
    border: 1px solid rgba(198, 40, 40, 0.3);
}
.btn-danger:hover {
    background: rgba(198, 40, 40, 0.3);
}

.btn-success {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid rgba(67, 160, 71, 0.3);
}
.btn-success:hover {
    background: rgba(67, 160, 71, 0.25);
}

.btn-info {
    background: var(--info-bg);
    color: var(--info);
    border: 1px solid rgba(30, 136, 229, 0.3);
}
.btn-info:hover {
    background: rgba(30, 136, 229, 0.25);
}

/* ===== File List / Table ===== */
.file-table {
    width: 100%;
    border-collapse: collapse;
}

.file-table th {
    text-align: left;
    padding: 10px 14px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}

.file-table td {
    padding: 12px 14px;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 13px;
    vertical-align: middle;
}

.file-table tr:last-child td {
    border-bottom: none;
}

.file-table tr:hover td {
    background: var(--bg-card-hover);
    cursor: pointer;
}

.file-name {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary);
    font-weight: 500;
}

.file-name i {
    color: var(--accent);
    font-size: 16px;
}

.actions-cell {
    display: flex;
    align-items: center;
    gap: 8px;
}

.rename-form {
    align-items: center;
    gap: 8px;
}

.rename-form input {
    min-width: 180px;
    max-width: 260px;
    background: var(--sidebar-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 13px;
    padding: 7px 10px;
    outline: none;
}

.rename-form input:focus {
    border-color: var(--accent);
}

/* ===== Image Grid ===== */
.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 16px;
    margin-top: 20px;
}

.image-item {
    background: var(--sidebar-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    position: relative;
    group: true;
    transition: border-color var(--transition);
}

.image-item:hover {
    border-color: var(--accent);
}

.image-item img {
    width: 100%;
    height: 110px;
    object-fit: cover;
    display: block;
}

.image-item-info {
    padding: 8px 10px;
    border-top: 1px solid var(--border);
}

.image-item-name {
    font-size: 11px;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.image-item-delete {
    position: absolute;
    top: 6px;
    right: 6px;
    background: rgba(0,0,0,0.6);
    border: none;
    color: #ef5350;
    border-radius: 4px;
    width: 26px;
    height: 26px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    opacity: 0;
    transition: opacity var(--transition);
}

.image-item:hover .image-item-delete {
    opacity: 1;
}

/* ===== Alert messages ===== */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
}

.alert-success {
    background: var(--success-bg);
    border: 1px solid rgba(67, 160, 71, 0.3);
    color: #81c784;
}

.alert-error {
    background: rgba(198, 40, 40, 0.12);
    border: 1px solid rgba(198, 40, 40, 0.3);
    color: #ef5350;
}

.alert-info {
    background: var(--info-bg);
    border: 1px solid rgba(30, 136, 229, 0.3);
    color: #64b5f6;
}

/* ===== Empty state ===== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 48px;
    margin-bottom: 16px;
    display: block;
    opacity: 0.4;
}

.empty-state p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ===== Dashboard stats ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: border-color var(--transition);
}

.stat-card:hover {
    border-color: var(--accent);
}

.stat-icon {
    width: 46px;
    height: 46px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

.stat-icon.red { background: var(--accent-light); color: var(--accent); }
.stat-icon.blue { background: var(--info-bg); color: var(--info); }
.stat-icon.green { background: var(--success-bg); color: var(--success); }
.stat-icon.orange { background: var(--warning-bg); color: var(--warning); }

.stat-value {
    font-size: 26px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
    margin-bottom: 4px;
}

.stat-label {
    font-size: 12px;
    color: var(--text-muted);
}

/* ===== Preview modal ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.75);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    width: 100%;
    max-width: 900px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.modal-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 18px;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.modal-close:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.modal-body {
    flex: 1;
    overflow: auto;
    padding: 20px;
    display: flex;
    justify-content: center;
}

/* A4 preview frame */
.a4-frame-wrapper {
    width: 100%;
    overflow: auto;
    display: flex;
    justify-content: center;
}

.a4-frame {
    width: 210mm;
    min-height: 297mm;
    background: #fff;
    box-shadow: 0 4px 32px rgba(0,0,0,0.5);
    border-radius: 2px;
    overflow: hidden;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ===== Tooltip ===== */
[data-tip] {
    position: relative;
}
[data-tip]::after {
    content: attr(data-tip);
    position: absolute;
    bottom: 110%;
    left: 50%;
    transform: translateX(-50%);
    background: #000;
    color: #fff;
    font-size: 11px;
    padding: 4px 8px;
    border-radius: 4px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s;
}
[data-tip]:hover::after { opacity: 1; }

/* ===== Loader ===== */
.spinner {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255,255,255,0.2);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }