/* ============================================================
   后台管理样式 - 极简风格
   ============================================================ */

:root {
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    --admin-bg: #f5f5f5;
    --admin-surface: #fff;
    --admin-border: #e5e5e5;
    --admin-text: #1a1a2e;
    --admin-text-secondary: #666;
    --admin-text-muted: #999;
    --admin-primary: #1a1a2e;
    --admin-primary-text: #fff;
    --admin-danger: #e53e3e;
    --admin-danger-text: #fff;
    --admin-radius: 6px;
    --admin-transition: 0.15s ease;
}

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

body {
    font-family: var(--font-family);
    font-size: 14px;
    color: var(--admin-text);
    background: var(--admin-bg);
    line-height: 1.5;
}

.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: #f0f0f0;
}

.login-container {
    background: #fff;
    padding: 2.5rem 2rem;
    border-radius: 8px;
    width: 100%;
    max-width: 360px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

.login-title {
    font-size: 1.25rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 1.5rem;
    letter-spacing: 0.04em;
}

.login-form .form-group {
    margin-bottom: 1rem;
}

.login-form label {
    display: block;
    font-size: 0.85rem;
    color: var(--admin-text-secondary);
    margin-bottom: 0.3rem;
}

.login-back {
    text-align: center;
    margin-top: 1rem;
}

.login-back a {
    font-size: 0.8rem;
    color: var(--admin-text-muted);
    text-decoration: none;
    transition: color var(--admin-transition);
}

.login-back a:hover {
    color: var(--admin-text-secondary);
}

.admin-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 0 1.5rem;
    height: 50px;
    background: var(--admin-surface);
    border-bottom: 1px solid var(--admin-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.admin-logo {
    font-weight: 600;
    font-size: 1rem;
    letter-spacing: 0.04em;
    flex-shrink: 0;
}

.admin-nav {
    display: flex;
    gap: 0.25rem;
}

.nav-tab {
    border: none;
    background: none;
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
    color: var(--admin-text-secondary);
    cursor: pointer;
    border-radius: var(--admin-radius);
    font-family: var(--font-family);
    transition: background var(--admin-transition);
}

.nav-tab:hover {
    background: #f0f0f0;
}

.nav-tab.active {
    background: var(--admin-primary);
    color: var(--admin-primary-text);
}

.admin-actions {
    margin-left: auto;
}

.admin-main {
    max-width: 960px;
    margin: 0 auto;
    padding: 1.5rem;
}

.panel {
    display: none;
}

.panel.active {
    display: block;
}

.panel-toolbar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.btn {
    border: 1px solid var(--admin-border);
    background: var(--admin-surface);
    color: var(--admin-text);
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
    border-radius: var(--admin-radius);
    cursor: pointer;
    font-family: var(--font-family);
    transition: background var(--admin-transition), border-color var(--admin-transition);
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.btn:hover {
    background: #f5f5f5;
}

.btn-primary {
    background: var(--admin-primary);
    color: var(--admin-primary-text);
    border-color: var(--admin-primary);
}

.btn-primary:hover {
    background: #333;
}

.btn-danger {
    background: var(--admin-danger);
    color: var(--admin-danger-text);
    border-color: var(--admin-danger);
}

.btn-danger:hover {
    background: #c53030;
}

.btn-danger:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-outline {
    background: transparent;
    border-color: var(--admin-border);
}

.btn-outline:hover {
    background: #f5f5f5;
}

.btn-full {
    width: 100%;
    justify-content: center;
    padding: 0.6rem;
}

.btn-sm {
    padding: 0.2rem 0.5rem;
    font-size: 0.75rem;
}

.btn-upload {
    position: relative;
    overflow: hidden;
}

.btn-upload input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.form-input {
    width: 100%;
    border: 1px solid var(--admin-border);
    border-radius: var(--admin-radius);
    padding: 0.4rem 0.6rem;
    font-size: 0.85rem;
    font-family: var(--font-family);
    color: var(--admin-text);
    background: var(--admin-surface);
    outline: none;
    transition: border-color var(--admin-transition);
}

.form-input:focus {
    border-color: var(--admin-text-secondary);
}

.form-range {
    width: 120px;
    accent-color: var(--admin-primary);
}

/* 图标上传区域 */
.icon-upload-area {
    position: relative;
    width: 100px;
    height: 100px;
    border: 2px dashed var(--admin-border);
    border-radius: 8px;
    cursor: pointer;
    transition: border-color var(--admin-transition), background var(--admin-transition);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-upload-area:hover {
    border-color: var(--admin-text-secondary);
    background: #fafafa;
}

.icon-upload-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    color: var(--admin-text-muted);
    font-size: 0.75rem;
    text-align: center;
    padding: 8px;
}

.icon-upload-placeholder svg {
    opacity: 0.5;
}

.icon-upload-hint {
    font-size: 0.65rem;
    color: var(--admin-text-muted);
    opacity: 0.6;
}

.icon-upload-preview {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 4px;
}

.icon-upload-remove {
    position: absolute;
    top: 2px;
    right: 2px;
    width: 20px;
    height: 20px;
    border: none;
    background: rgba(0,0,0,0.5);
    color: #fff;
    border-radius: 50%;
    font-size: 14px;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.icon-upload-remove:hover {
    background: var(--admin-danger);
}

.form-group {
    margin-bottom: 0.75rem;
}

.form-group label {
    display: block;
    font-size: 0.8rem;
    color: var(--admin-text-secondary);
    margin-bottom: 0.25rem;
}

.form-check {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.form-check input[type="checkbox"] {
    width: auto;
    margin: 0;
}

.form-check label {
    display: inline;
    margin-bottom: 0;
    font-size: 0.85rem;
    color: var(--admin-text);
    cursor: pointer;
}

.form-error {
    color: var(--admin-danger);
    font-size: 0.8rem;
    margin-bottom: 0.5rem;
    padding: 0.4rem;
    background: #fff5f5;
    border-radius: var(--admin-radius);
}

.status-text {
    font-size: 0.8rem;
    color: var(--admin-text-muted);
}

.settings-form {
    background: var(--admin-surface);
    border: 1px solid var(--admin-border);
    border-radius: 8px;
    padding: 1.5rem;
}

.settings-form h2 {
    font-size: 1rem;
    font-weight: 600;
    margin: 1.25rem 0 0.75rem;
    padding-bottom: 0.4rem;
    border-bottom: 1px solid var(--admin-border);
    letter-spacing: 0.03em;
}

.settings-form h2:first-child {
    margin-top: 0;
}

.form-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.65rem;
    flex-wrap: wrap;
}

.form-row > label:first-child {
    width: 160px;
    flex-shrink: 0;
    font-size: 0.85rem;
    color: var(--admin-text-secondary);
}

.form-row .form-input {
    width: auto;
    flex: 1;
    min-width: 160px;
    max-width: 320px;
}

.form-row .form-range {
    width: 120px;
    flex: none;
}

.range-val {
    font-size: 0.8rem;
    color: var(--admin-text-muted);
    width: 36px;
}

.links-container {
    background: var(--admin-surface);
    border: 1px solid var(--admin-border);
    border-radius: 8px;
    padding: 1rem;
    min-height: 100px;
}

.loading {
    text-align: center;
    color: var(--admin-text-muted);
    padding: 2rem;
}

.cat-block {
    margin-bottom: 1rem;
    border: 1px solid var(--admin-border);
    border-radius: var(--admin-radius);
}

.cat-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: #fafafa;
    border-bottom: 1px solid var(--admin-border);
    border-radius: var(--admin-radius) var(--admin-radius) 0 0;
    cursor: grab;
}

.cat-header:active {
    cursor: grabbing;
}

.cat-name {
    font-weight: 600;
    font-size: 0.9rem;
    flex: 1;
}

.cat-actions {
    display: flex;
    gap: 0.25rem;
}

.cat-links {
    min-height: 36px;
    padding: 0.25rem;
}

.cat-links.drag-over {
    background: #f0f4ff;
}

.link-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.5rem;
    border-radius: 4px;
    cursor: grab;
    transition: background var(--admin-transition);
}

.link-item:hover {
    background: #f5f5f5;
}

.link-item:active {
    cursor: grabbing;
}

.link-item.selected {
    background: #eef2ff;
}

.link-item .link-check {
    flex-shrink: 0;
}

.link-item .link-info {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    overflow: hidden;
}

.link-item .link-info .l-icon {
    flex-shrink: 0;
    font-size: 1rem;
}

.link-item .link-info .l-name {
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.link-item .link-info .l-url {
    font-size: 0.75rem;
    color: var(--admin-text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 200px;
}

.link-item .link-actions {
    display: flex;
    gap: 0.25rem;
    flex-shrink: 0;
}

.backgrounds-container {
    background: var(--admin-surface);
    border: 1px solid var(--admin-border);
    border-radius: 8px;
    padding: 1rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 0.75rem;
    min-height: 100px;
}

.bg-card {
    border: 1px solid var(--admin-border);
    border-radius: var(--admin-radius);
    overflow: hidden;
    cursor: grab;
    transition: border-color var(--admin-transition);
}

.bg-card:active {
    cursor: grabbing;
}

.bg-card:hover {
    border-color: var(--admin-text-secondary);
}

.bg-card-preview {
    width: 100%;
    height: 100px;
    object-fit: cover;
    display: block;
}

.bg-card-info {
    padding: 0.4rem 0.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--admin-text-muted);
}

.bg-card-info .bg-order {
    font-weight: 500;
}

.modal {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.3);
}

.modal-content {
    position: relative;
    background: var(--admin-surface);
    padding: 1.5rem;
    border-radius: 8px;
    width: 100%;
    max-width: 420px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    z-index: 1;
}

.modal-content h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    letter-spacing: 0.03em;
}

.modal-content .form-group {
    margin-bottom: 0.75rem;
}

.modal-content .form-group label {
    display: block;
    font-size: 0.8rem;
    color: var(--admin-text-secondary);
    margin-bottom: 0.25rem;
}

.modal-content .form-input {
    margin-bottom: 0.5rem;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    margin-top: 1rem;
}

@media (max-width: 768px) {
    .admin-header {
        padding: 0 0.75rem;
        gap: 0.75rem;
    }
    .admin-main {
        padding: 1rem 0.75rem;
    }
    .form-row > label:first-child {
        width: 100%;
        margin-bottom: -0.4rem;
    }
    .form-row .form-input {
        max-width: 100%;
    }
    .backgrounds-container {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    }
    .link-item .link-info .l-url {
        display: none;
    }
}

@media (max-width: 480px) {
    .admin-nav {
        flex-wrap: wrap;
    }
    .nav-tab {
        font-size: 0.78rem;
        padding: 0.3rem 0.5rem;
    }
    .backgrounds-container {
        grid-template-columns: repeat(2, 1fr);
    }
}