/* ============================================
   长青图床 - 企业级样式表
   ============================================ */

/* --- CSS Variables --- */
:root {
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-primary-light: #dbeafe;
    --color-danger: #dc2626;
    --color-danger-hover: #b91c1c;
    --color-danger-light: #fee2e2;
    --color-success: #16a34a;
    --color-success-light: #dcfce7;
    --color-warning: #f59e0b;
    --color-warning-light: #fef3c7;
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-border: #e2e8f0;
    --color-text: #1e293b;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;
    --radius: 8px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
    --transition: 0.2s ease;
}

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

html { font-size: 16px; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

code, pre {
    font-family: "SF Mono", "Fira Code", "Cascadia Code", Consolas, monospace;
    background: #f1f5f9;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.875rem;
}

pre {
    padding: 12px 16px;
    overflow-x: auto;
    line-height: 1.5;
    white-space: pre-wrap;
}

pre code { padding: 0; background: none; }

ul { padding-left: 1.25rem; }
li { margin-bottom: 4px; }

/* --- Header --- */
.header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo:hover { text-decoration: none; color: var(--color-primary); }

.nav {
    display: flex;
    gap: 4px;
}

.nav-link {
    padding: 8px 16px;
    border-radius: var(--radius);
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition);
}

.nav-link:hover { background: var(--color-primary-light); color: var(--color-primary); text-decoration: none; }
.nav-link.active { background: var(--color-primary); color: #fff; }
.nav-link.active:hover { background: var(--color-primary-hover); color: #fff; }

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-badge {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    background: var(--color-bg);
    padding: 4px 10px;
    border-radius: 20px;
}

/* --- Main --- */
.main {
    flex: 1;
    max-width: 1280px;
    width: 100%;
    margin: 0 auto;
    padding: 24px;
}

/* --- Footer --- */
.footer {
    text-align: center;
    padding: 20px;
    color: var(--color-text-muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--color-border);
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    line-height: 1.4;
}

.btn:hover { text-decoration: none; }

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

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

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

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

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

.btn-outline:hover { background: var(--color-bg); border-color: var(--color-text-muted); color: var(--color-text); }

.btn-sm { padding: 6px 12px; font-size: 0.8rem; }
.btn-lg { padding: 12px 28px; font-size: 1rem; }
.btn-block { width: 100%; }

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

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--color-text);
}

.form-input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.95rem;
    color: var(--color-text);
    background: var(--color-surface);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-hint {
    display: block;
    margin-top: 4px;
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* --- Alerts --- */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    font-size: 0.9rem;
}

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

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

/* --- Page Header --- */
.page-header {
    margin-bottom: 24px;
}

.page-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.page-header p {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

/* --- Hero (Home) --- */
.hero {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 200px);
    text-align: center;
}

.hero-content {
    max-width: 500px;
}

.hero-icon {
    color: var(--color-primary);
    margin-bottom: 24px;
    display: inline-block;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.hero-desc {
    color: var(--color-text-secondary);
    font-size: 1.1rem;
    margin-bottom: 32px;
}

.hero-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}

/* --- Login --- */
.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 160px);
}

.login-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 40px;
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow-lg);
}

.login-header {
    text-align: center;
    margin-bottom: 28px;
}

.login-icon {
    color: var(--color-primary);
    margin-bottom: 16px;
}

.login-header h2 {
    font-size: 1.5rem;
    margin-bottom: 4px;
}

.login-header p {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.login-footer {
    margin-top: 20px;
    text-align: center;
}

.back-link {
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

.back-link:hover { color: var(--color-primary); }

/* --- Gallery Grid --- */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.gallery-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: box-shadow var(--transition), transform var(--transition);
}

.gallery-item:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.gallery-item-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
    background: #f1f5f9;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

/* 骨架屏占位动画 */
.gallery-item-image::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, #f1f5f9 25%, #e2e8f0 50%, #f1f5f9 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    z-index: 1;
}

@keyframes shimmer {
    0%   { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.gallery-item-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: opacity 0.4s ease, transform 0.3s ease;
    opacity: 0;
    position: relative;
    z-index: 2;
}

.gallery-item-image img.loaded {
    opacity: 1;
}

/* 图片加载完成后隐藏骨架屏 */
.gallery-item-image img.loaded ~ .gallery-item-image::before,
.gallery-item-image:has(img.loaded)::before {
    display: none;
}

/* 兼容方案：图片加载后通过 JS 移除伪元素 */
.gallery-item-image.no-skeleton::before {
    display: none;
}

.gallery-item:hover .gallery-item-image img.loaded {
    transform: scale(1.05);
}

.gallery-item-info {
    padding: 14px;
}

.gallery-item-name {
    font-size: 0.85rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 6px;
}

.gallery-item-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-bottom: 12px;
}

.gallery-item-actions {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.gallery-item-actions .btn {
    flex: 1;
    min-width: fit-content;
    font-size: 0.78rem;
    padding: 5px 10px;
}

/* --- Empty State --- */
.empty-state {
    text-align: center;
    padding: 60px 20px;
}

.empty-icon {
    color: var(--color-text-muted);
    margin-bottom: 16px;
}

.empty-state h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.empty-state p {
    color: var(--color-text-secondary);
    margin-bottom: 20px;
}

/* --- Pagination --- */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

.page-info {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

/* --- Upload --- */
.upload-container {
    max-width: 600px;
    margin: 0 auto;
}

.upload-dropzone {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: 48px 24px;
    text-align: center;
    background: var(--color-surface);
    transition: all var(--transition);
    cursor: pointer;
}

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

.upload-icon {
    color: var(--color-text-muted);
    margin-bottom: 16px;
}

.upload-dropzone h3 {
    font-size: 1.1rem;
    margin-bottom: 4px;
}

.upload-hint {
    color: var(--color-text-muted);
    font-size: 0.85rem;
    margin-bottom: 20px;
}

.paste-hint {
    color: var(--color-text-muted);
    font-size: 0.8rem;
    margin-top: 12px;
}

/* --- Progress Bar --- */
.upload-progress {
    margin-top: 24px;
    text-align: center;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--color-border);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 8px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), #3b82f6);
    border-radius: 4px;
    width: 0%;
    transition: width 0.3s ease;
    animation: progress-pulse 1.5s ease-in-out infinite;
}

@keyframes progress-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.progress-text {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

/* --- Upload Result --- */
.upload-result {
    margin-top: 24px;
}

.result-card {
    background: var(--color-success-light);
    border: 1px solid #bbf7d0;
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
}

.result-card.success h4 { color: var(--color-success); }
.result-card.error { background: var(--color-danger-light); border-color: #fecaca; }
.result-card.error h4 { color: var(--color-danger); }

.result-card img {
    max-width: 200px;
    max-height: 150px;
    border-radius: 4px;
    margin: 12px 0;
    border: 1px solid var(--color-border);
}

.result-card .result-meta {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-bottom: 12px;
}

.result-card .result-url {
    display: flex;
    gap: 8px;
    justify-content: center;
    align-items: center;
    margin-top: 8px;
}

.result-card .result-url input {
    flex: 1;
    max-width: 350px;
    padding: 8px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.85rem;
    background: #fff;
}

/* --- Settings --- */
.settings-container {
    max-width: 700px;
    margin: 0 auto;
}

.settings-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 28px;
    margin-bottom: 20px;
}

.settings-card h2 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.settings-desc {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
    margin-bottom: 20px;
}

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

.info-table td {
    padding: 8px 0;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.9rem;
}

.info-table td:first-child {
    color: var(--color-text-secondary);
    width: 180px;
}

.text-success { color: var(--color-success); }
.text-danger { color: var(--color-danger); }

/* --- API Keys --- */
.api-container {
    max-width: 900px;
    margin: 0 auto;
}

.api-generate-card,
.api-keys-card,
.api-usage-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 28px;
    margin-bottom: 20px;
}

.api-generate-card h2,
.api-keys-card h2,
.api-usage-card h2 {
    font-size: 1.1rem;
    margin-bottom: 16px;
}

.api-form {
    display: flex;
    gap: 12px;
    align-items: flex-end;
}

.api-form .form-group {
    flex: 1;
    margin-bottom: 0;
}

.table-wrapper {
    overflow-x: auto;
}

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

.data-table th {
    text-align: left;
    padding: 10px 12px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--color-border);
}

.data-table td {
    padding: 12px;
    font-size: 0.88rem;
    border-bottom: 1px solid var(--color-border);
    vertical-align: middle;
}

.key-code {
    background: #f1f5f9;
    font-size: 0.8rem;
    user-select: all;
}

.action-cell {
    white-space: nowrap;
    display: flex;
    gap: 6px;
}

.status-badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
}

.status-active { background: var(--color-success-light); color: var(--color-success); }
.status-inactive { background: #f1f5f9; color: var(--color-text-muted); }

.api-docs {
    font-size: 0.9rem;
}

.api-docs h3 {
    font-size: 1rem;
    margin: 16px 0 8px;
}

.api-docs .endpoint {
    background: var(--color-primary-light);
    color: var(--color-primary);
    padding: 4px 10px;
    font-weight: 600;
}

/* --- Key Display Modal --- */
.key-display {
    display: flex;
    gap: 8px;
    align-items: center;
    margin: 12px 0;
    background: #f1f5f9;
    padding: 12px;
    border-radius: var(--radius);
    word-break: break-all;
}

.key-display code {
    flex: 1;
    background: none;
    padding: 0;
    font-size: 0.85rem;
    user-select: all;
}

/* --- Modal --- */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}

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

.modal-preview {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.modal-close {
    position: absolute;
    top: 12px;
    right: 12px;
    z-index: 10;
    background: rgba(0, 0, 0, 0.5);
    color: #fff;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition);
}

.modal-close:hover {
    background: rgba(0, 0, 0, 0.75);
}

.preview-content {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.preview-content img {
    max-width: 90vw;
    max-height: 80vh;
    object-fit: contain;
    display: block;
}

.preview-info {
    padding: 16px 24px;
    width: 100%;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.modal-dialog {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 440px;
    box-shadow: var(--shadow-xl);
}

.modal-dialog-header {
    padding: 20px 24px 0;
}

.modal-dialog-header h3 {
    font-size: 1.1rem;
}

.modal-dialog-body {
    padding: 16px 24px;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.modal-dialog-footer {
    padding: 0 24px 20px;
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

/* --- Toast --- */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--color-text);
    color: #fff;
    padding: 12px 24px;
    border-radius: var(--radius);
    font-size: 0.9rem;
    z-index: 2000;
    opacity: 0;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
    white-space: nowrap;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast.success { background: var(--color-success); }
.toast.error { background: var(--color-danger); }

/* --- Error Page --- */
.error-page {
    text-align: center;
    padding: 80px 20px;
}

.error-page h1 {
    font-size: 6rem;
    font-weight: 800;
    color: var(--color-border);
    line-height: 1;
    margin-bottom: 8px;
}

.error-page p {
    color: var(--color-text-secondary);
    margin-bottom: 24px;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .header-inner {
        padding: 0 16px;
        height: 52px;
    }

    .nav {
        gap: 0;
    }

    .nav-link {
        padding: 6px 10px;
        font-size: 0.8rem;
    }

    .main {
        padding: 16px;
    }

    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 12px;
    }

    .gallery-item-image {
        height: 140px;
    }

    .gallery-item-actions {
        flex-direction: column;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .login-card {
        padding: 24px;
        margin: 0 16px;
    }

    .api-form {
        flex-direction: column;
        align-items: stretch;
    }

    .data-table {
        font-size: 0.8rem;
    }

    .data-table th,
    .data-table td {
        padding: 8px 6px;
    }

    .settings-card {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .header-inner {
        flex-wrap: wrap;
        height: auto;
        padding: 10px 12px;
        gap: 8px;
    }

    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 8px;
    }

    .gallery-item-image {
        height: 120px;
    }

    .hero h1 {
        font-size: 1.5rem;
    }
}