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

:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --danger: #dc2626;
    --danger-hover: #b91c1c;
    --success: #16a34a;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --radius: 8px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
    margin-bottom: 24px;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    font-size: 20px;
    font-weight: 700;
}

.header nav {
    display: flex;
    gap: 16px;
    align-items: center;
}

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

.header nav a:hover {
    color: var(--text);
    text-decoration: none;
}

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

.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
}

.stat-card .number {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary);
}

.stat-card .label {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    text-align: center;
    transition: background 0.2s;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    text-decoration: none;
}

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

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

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

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

.btn-outline:hover {
    background: var(--bg);
    text-decoration: none;
}

.actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

/* Login */
.login-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: var(--bg);
}

.login-box {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 40px;
    width: 100%;
    max-width: 400px;
}

.login-box h1 {
    text-align: center;
    margin-bottom: 24px;
    font-size: 22px;
}

/* Forms */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 6px;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus {
    border-color: var(--primary);
}

/* Alert */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    font-size: 14px;
}

.alert-error {
    background: #fef2f2;
    color: var(--danger);
    border: 1px solid #fecaca;
}

.alert-success {
    background: #f0fdf4;
    color: var(--success);
    border: 1px solid #bbf7d0;
}

/* Table */
.table-wrapper {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

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

.table th,
.table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
}

.table th {
    background: var(--bg);
    font-weight: 600;
    font-size: 13px;
    color: var(--text-muted);
}

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

.table tr:hover td {
    background: #f8fafc;
}

/* Image grid */
.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
}

.image-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.image-card .thumb {
    width: 100%;
    height: 150px;
    object-fit: cover;
    display: block;
    background: var(--bg);
}

.image-card .info {
    padding: 12px;
}

.image-card .name {
    font-size: 12px;
    color: var(--text-muted);
    word-break: break-all;
    margin-bottom: 4px;
}

.image-card .meta {
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.image-card .card-actions {
    display: flex;
    gap: 6px;
}

/* Upload area */
.upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s;
    margin-bottom: 16px;
}

.upload-area:hover {
    border-color: var(--primary);
}

.upload-area.dragover {
    border-color: var(--primary);
    background: #eff6ff;
}

.upload-area input[type="file"] {
    display: none;
}

.upload-area .icon {
    font-size: 36px;
    margin-bottom: 8px;
}

.upload-area .text {
    font-size: 14px;
    color: var(--text-muted);
}

/* Preview */
.preview {
    max-width: 300px;
    max-height: 200px;
    margin: 16px auto;
    display: none;
}

.preview img {
    max-width: 100%;
    max-height: 200px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

/* URL box */
.url-box {
    display: flex;
    gap: 8px;
    margin-top: 12px;
}

.url-box input {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 13px;
    font-family: monospace;
}

/* Filter */
.filter-bar {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
    align-items: center;
}

.filter-bar select {
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
}

/* Folder list */
.folder-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 12px;
}

.folder-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
}

.folder-item .name {
    font-weight: 500;
}

.folder-item .count {
    font-size: 13px;
    color: var(--text-muted);
}

/* API info */
.api-info {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
}

.api-info h3 {
    margin-bottom: 16px;
}

.api-endpoint {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 16px;
    margin-bottom: 12px;
}

.api-endpoint .method {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
    margin-right: 8px;
}

.api-endpoint .method-get {
    background: #dbeafe;
    color: #1e40af;
}

.api-endpoint .method-post {
    background: #dcfce7;
    color: #166534;
}

.api-endpoint .method-delete {
    background: #fee2e2;
    color: #991b1b;
}

.api-endpoint .path {
    font-family: monospace;
    font-size: 14px;
}

.api-desc {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 6px;
}

/* Modal */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    max-width: 400px;
    width: 90%;
}

.modal h3 {
    margin-bottom: 12px;
}

.modal p {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 20px;
}

.modal-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
}

/* Footer */
.footer {
    border-top: 1px solid var(--border);
    padding: 20px 0;
    margin-top: 40px;
    text-align: center;
    font-size: 13px;
    color: var(--text-muted);
}

.footer a {
    color: var(--text-muted);
}

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

/* Responsive */
@media (max-width: 640px) {
    .container {
        padding: 12px;
    }

    .header .container {
        flex-direction: column;
        gap: 12px;
    }

    .header nav {
        flex-wrap: wrap;
        justify-content: center;
        gap: 8px 16px;
    }

    .stats {
        grid-template-columns: 1fr;
    }

    .image-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }

    .filter-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .upload-area {
        padding: 24px 16px;
    }

    .folder-list {
        grid-template-columns: 1fr;
    }

    .settings-columns {
        flex-direction: column;
    }

    .settings-columns > div {
        min-width: 0 !important;
        max-width: none !important;
    }

    .folder-check-item {
        flex-direction: column;
        align-items: flex-start !important;
        gap: 8px;
    }

    .url-box {
        flex-direction: column;
    }

    .login-box {
        padding: 24px;
        margin: 12px;
    }

    .upload-area .icon {
        font-size: 28px;
    }
}