/* 重置和基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 浅色主题 */
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --accent-color: #e74c3c;
    --warning-color: #f39c12;
    
    --bg-color: #ffffff;
    --surface-color: #f8f9fa;
    --border-color: #e9ecef;
    --text-color: #2c3e50;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    
    --shadow-light: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-medium: 0 4px 8px rgba(0,0,0,0.12);
    --shadow-heavy: 0 8px 16px rgba(0,0,0,0.15);
    
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    /* 深色主题 */
    --primary-color: #5dade2;
    --secondary-color: #58d68d;
    --accent-color: #ec7063;
    --warning-color: #f4d03f;
    
    --bg-color: #1a1a1a;
    --surface-color: #2d2d2d;
    --border-color: #404040;
    --text-color: #e8e8e8;
    --text-secondary: #b0b0b0;
    --text-muted: #808080;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 头部样式 */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 2rem 1rem;
    text-align: center;
    position: relative;
}

.header-content h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.header-content p {
    font-size: 1.1rem;
    opacity: 0.9;
}

.theme-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(255,255,255,0.2);
    
    /* 语言切换按钮 */
    .lang-toggle {
        background: var(--surface-color);
        border: 1px solid var(--border-color);
        color: var(--text-color);
        padding: 0.45rem 0.75rem;
        margin-left: 0.75rem;
        border-radius: 8px;
        cursor: pointer;
        font-size: 0.75rem;
        font-weight: 600;
        letter-spacing: 0.5px;
        transition: background .25s, color .25s, border .25s, transform .2s;
    }

    .lang-toggle:hover { background: var(--primary-color); color: #fff; }
    .lang-toggle:active { transform: scale(.92); }
    [data-theme="dark"] .lang-toggle { background:#1f2733; }
    [data-theme="dark"] .lang-toggle:hover { background: var(--primary-color); }
    border: none;
    color: white;
    padding: 0.75rem;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.theme-toggle:hover {
    background: rgba(255,255,255,0.3);
    transform: scale(1.1);
}

/* 导航样式 */
.nav {
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    box-shadow: var(--shadow-light);
}

.nav-btn {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.75rem 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.nav-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transition: left 0.5s;
}

.nav-btn:hover::before {
    left: 100%;
}

.nav-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.nav-btn.active {
    background: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-medium);
    transform: translateY(-1px);
}

.nav-btn i {
    font-size: 1rem;
    transition: transform 0.3s ease;
}

.nav-btn:hover i {
    transform: scale(1.1);
}

/* 主内容区域 */
.main {
    flex: 1;
    padding: 2rem 1rem;
}

.tool {
    display: none;
    max-width: 800px;
    margin: 0 auto;
}

.tool.active {
    display: block;
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.tool-header {
    text-align: center;
    margin-bottom: 2rem;
}

.tool-header h2 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.tool-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.tool-content {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-medium);
}

/* 表单样式 */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-color);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--bg-color);
    color: var(--text-color);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-group input[type="range"] {
    padding: 0;
    background: transparent;
}

/* 复选框组样式 */
.checkbox-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 400;
    cursor: pointer;
}

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

/* 按钮样式 */
.btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.btn.secondary {
    background: var(--text-secondary);
}

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

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* 结果框样式 */
.result-group {
    margin-top: 1.5rem;
}

.result-box {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.result-box input {
    flex: 1;
}

.copy-btn {
    background: var(--secondary-color);
    color: white;
    border: none;
    padding: 0.75rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.copy-btn:hover {
    background: #27ae60;
    transform: scale(1.05);
}

/* 密码强度指示器 */
.password-strength {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: 1rem;
}

.strength-meter {
    flex: 1;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.strength-bar {
    height: 100%;
    transition: var(--transition);
    border-radius: 4px;
}

.strength-bar.weak {
    width: 25%;
    background: var(--accent-color);
}

.strength-bar.medium {
    width: 50%;
    background: var(--warning-color);
}

.strength-bar.strong {
    width: 75%;
    background: var(--secondary-color);
}

.strength-bar.very-strong {
    width: 100%;
    background: var(--secondary-color);
}

/* 颜色选择器样式 */
.color-picker-section {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.color-display {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

.color-preview {
    width: 120px;
    height: 120px;
    border-radius: var(--border-radius-lg);
    border: 3px solid var(--border-color);
    box-shadow: var(--shadow-medium);
}

.color-inputs {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.input-group {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.input-group label {
    min-width: 60px;
    font-weight: 500;
}

.input-group input {
    flex: 1;
}

.color-palette {
    margin-top: 2rem;
}

.palette-colors {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 1rem;
    margin: 1rem 0;
}

.palette-color {
    height: 80px;
    border-radius: var(--border-radius);
    border: 2px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.palette-color:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-medium);
}

.palette-color::after {
    content: attr(data-color);
    position: absolute;
    bottom: -1.5rem;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* 正则表达式测试器样式 */
.regex-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.regex-flags {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.regex-flags label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 400;
    cursor: pointer;
}

.regex-results {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1rem;
}

.matches-list {
    max-height: 300px;
    overflow-y: auto;
}

.match-item {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 0.75rem;
    margin-bottom: 0.5rem;
}

.match-text {
    font-family: 'Courier New', monospace;
    background: var(--primary-color);
    color: white;
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
}

/* JSON格式化器样式 */
.json-section {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 1.5rem;
    align-items: start;
}

.json-controls {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding-top: 2rem;
}

.json-info {
    margin-top: 0.5rem;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
}

.json-info.success {
    background: rgba(46, 204, 113, 0.1);
    color: var(--secondary-color);
    border: 1px solid rgba(46, 204, 113, 0.3);
}

.json-info.error {
    background: rgba(231, 76, 60, 0.1);
    color: var(--accent-color);
    border: 1px solid rgba(231, 76, 60, 0.3);
}

/* URL和Base64编码器样式 */
.url-section,
.base64-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.url-controls,
.base64-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* 哈希计算器样式 */
.hash-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.hash-results {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.hash-result {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.hash-result label {
    font-weight: 600;
    color: var(--primary-color);
}

/* 页脚样式 */
.footer {
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: 2rem 1rem;
    text-align: center;
    margin-top: auto;
}

.footer p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

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

/* 可访问性增强 */
.skip-link {position:absolute;left:-999px;top:auto;width:1px;height:1px;overflow:hidden;z-index:1000;background:#000;color:#fff;padding:.75rem 1rem;border-radius:6px;font-weight:600;}
.skip-link:focus{left:50%;top:12px;transform:translateX(-50%);width:auto;height:auto;outline:3px solid var(--primary-color);}

:focus-visible {outline:2px solid var(--primary-color);outline-offset:2px;}

@media (prefers-reduced-motion: reduce){
  * {animation-duration:0.001ms !important;animation-iteration-count:1 !important;transition-duration:0.001ms !important;scroll-behavior:auto !important;}
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-content h1 {
        font-size: 2rem;
    }
    
    .nav {
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: 1.5rem;
    }
    
    .nav-btn span {
        display: none;
    }
    
    .tool-content {
        padding: 1rem;
    }
    
    .color-picker-section {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .json-section {
        grid-template-columns: 1fr;
    }
    
    .json-controls {
        flex-direction: row;
        justify-content: center;
        padding-top: 0;
    }
    
    .url-controls,
    .base64-controls {
        flex-direction: column;
    }
    
    .checkbox-group {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        margin: 0;
    }
    
    .header {
        padding: 1.5rem 1rem;
    }
    
    .header-content h1 {
        font-size: 1.8rem;
    }
    
    .main {
        padding: 1rem;
    }
    
    .tool-content {
        padding: 1rem;
        margin: 0 -0.5rem;
    }
    
    .theme-toggle {
        top: 0.5rem;
        right: 0.5rem;
    }
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--surface-color);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* 选择文本样式 */
::selection {
    background: var(--primary-color);
    color: white;
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 时间戳转换器样式 */
.timestamp-section {
    display: grid;
    gap: 2rem;
}

.timestamp-input, .datetime-input {
    background: var(--surface-color);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.timestamp-formats {
    background: var(--surface-color);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.format-grid {
    display: grid;
    gap: 1rem;
    margin-top: 1rem;
}

.format-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.format-item label {
    min-width: 100px;
    font-weight: 500;
    color: var(--text-secondary);
}

.format-item input {
    flex: 1;
}

/* 二维码生成器样式 */
.qr-section {
    display: grid;
    gap: 2rem;
}

.qr-input {
    background: var(--surface-color);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.qr-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin: 1rem 0;
}

.qr-output {
    background: var(--surface-color);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    text-align: center;
}

.qr-display {
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    background: white;
    border-radius: var(--border-radius);
    border: 2px dashed var(--border-color);
}

.qr-display img {
    max-width: 100%;
    height: auto;
}

.qr-actions {
    margin-top: 1rem;
}

/* 文本差异对比器样式 */
.diff-section {
    display: grid;
    gap: 1.5rem;
}

.diff-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.diff-input {
    background: var(--surface-color);
    padding: 1rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.diff-input label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.diff-controls {
    text-align: center;
}

.diff-output {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.diff-stats {
    padding: 1rem;
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    font-weight: 500;
}

.diff-result {
    max-height: 500px;
    overflow-y: auto;
}

.diff-content {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.4;
}

.diff-line {
    display: flex;
    align-items: center;
    padding: 0.25rem 0;
    border-left: 3px solid transparent;
}

.diff-line.unchanged {
    background: var(--bg-color);
}

.diff-line.added {
    background: #d4edda;
    border-left-color: #27ae60;
}

.diff-line.removed {
    background: #f8d7da;
    border-left-color: #e74c3c;
}

[data-theme="dark"] .diff-line.added {
    background: rgba(39, 174, 96, 0.2);
}

[data-theme="dark"] .diff-line.removed {
    background: rgba(231, 76, 60, 0.2);
}

.line-number {
    display: inline-block;
    width: 40px;
    padding: 0 0.5rem;
    text-align: right;
    color: var(--text-muted);
    background: var(--surface-color);
    border-right: 1px solid var(--border-color);
    user-select: none;
}

/* Share Bar */
.share-bar {
    display: flex;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--card-bg, #ffffff);
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.06);
    margin: 1rem 0 1.5rem;
    flex-wrap: wrap;
}

.share-btn {
    background: var(--primary-color,#3498db);
    border: none;
    color: #fff;
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1.1rem;
    transition: transform .2s, box-shadow .2s, background .2s;
}

.share-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 14px rgba(0,0,0,0.15);
}

[data-theme="dark"] .share-bar {
    background: #1f2733;
    box-shadow: 0 4px 14px rgba(0,0,0,0.4);
}

[data-theme="dark"] .share-btn {
    background: #3d6fa3;
}

.share-btn:active { transform: scale(.92); }

/* Floating Star CTA */
.star-cta {
    position: fixed;
    right: 18px;
    bottom: 18px;
    z-index: 1500;
    background: var(--primary-color);
    color: #fff;
    padding: .75rem 1rem;
    border-radius: 16px;
    box-shadow: 0 10px 25px -5px rgba(0,0,0,.3);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: .65rem;
    font-size: .9rem;
    font-weight: 600;
    transform: translateY(30px);
    opacity: 0;
    transition: opacity .4s ease, transform .4s ease, background .3s;
}
.star-cta.show { opacity: 1; transform: translateY(0); }
.star-cta.hide { opacity:0; pointer-events:none; }
.star-cta-inner { display:flex; align-items:center; gap:.4rem; }
.star-cta i { color: #ffd166; }
.star-cta:hover { background: #2574a8; }
.star-cta.expanded { padding-right: .75rem; }

.star-cta-actions { display:flex; gap:.4rem; overflow:hidden; max-width:0; transition:max-width .35s ease; }
.star-cta.expanded .star-cta-actions { max-width:200px; }

.cta-btn { background:rgba(255,255,255,.2); backdrop-filter:blur(4px); border:none; color:#fff; width:38px; height:38px; border-radius:12px; display:flex; align-items:center; justify-content:center; cursor:pointer; transition:background .25s, transform .25s; }
.cta-btn:hover { background:rgba(255,255,255,.32); transform:translateY(-3px); }
.cta-btn:active { transform:scale(.9); }

[data-theme="dark"] .star-cta { background:#255e87; }
[data-theme="dark"] .star-cta:hover { background:#1e4e70; }
[data-theme="dark"] .cta-btn { background:rgba(255,255,255,.15); }
[data-theme="dark"] .cta-btn:hover { background:rgba(255,255,255,.28); }

/* CSS 单位转换器 */
.css-unit-table {
    margin-top: 1.25rem;
    display: grid;
    grid-template-columns: repeat(auto-fill,minmax(140px,1fr));
    gap: .75rem;
}

.css-unit-table .unit-item {
    background: var(--surface-color);
    padding: .75rem .6rem;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.06);
    font-size: .8rem;
    display: flex;
    flex-direction: column;
    gap: .35rem;
    position: relative;
    overflow: hidden;
}

.css-unit-table .unit-item h4 {
    margin: 0;
    font-size: .75rem;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: .5px;
    text-transform: uppercase;
}

.css-unit-table .unit-item code {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: .85rem;
    background: rgba(0,0,0,0.05);
    padding: 2px 4px;
    border-radius: 4px;
    word-break: break-all;
}

[data-theme="dark"] .css-unit-table .unit-item code {
    background: rgba(255,255,255,0.08);
}
.line-content {
    padding: 0 1rem;
    white-space: pre-wrap;
    word-break: break-all;
    flex: 1;
}

/* 响应式设计 - 新工具 */
@media (max-width: 768px) {
    .qr-options {
        grid-template-columns: 1fr;
    }
    
    .diff-inputs {
        grid-template-columns: 1fr;
    }
    
    .format-grid {
        gap: 0.5rem;
    }
    
    .format-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .format-item label {
        min-width: auto;
        margin-bottom: 0.25rem;
    }
    
    .diff-line {
        font-size: 0.75rem;
    }
    
    .line-number {
        width: 30px;
        padding: 0 0.25rem;
    }
    
    .line-content {
        padding: 0 0.5rem;
    }
}

/* PWA 安装横幅样式 */
#install-banner, #update-banner {
    position: fixed;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg);
    box-shadow: var(--shadow-heavy);
    z-index: 1000;
    min-width: 300px;
    max-width: 90vw;
    transition: top 0.3s ease;
}

#install-banner.show, #update-banner.show {
    top: 0;
}

.install-content, .update-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.install-text, .update-text {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
}

.install-actions, .update-actions {
    display: flex;
    gap: 0.5rem;
}

.install-actions .btn, .update-actions .btn {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    border: 1px solid rgba(255,255,255,0.3);
}

.install-actions .btn.primary, .update-actions .btn.primary {
    background: rgba(255,255,255,0.2);
    color: white;
}

.install-actions .btn.secondary, .update-actions .btn.secondary {
    background: transparent;
    color: rgba(255,255,255,0.9);
}

.install-actions .btn:hover, .update-actions .btn:hover {
    background: rgba(255,255,255,0.3);
}

/* JSON Tree View */
.json-tree {font-family: ui-monospace, SFMono-Regular, Menlo, monospace; background: var(--bg-color); border:1px solid var(--border-color); border-radius:6px; padding:.75rem; max-height:420px; overflow:auto; line-height:1.4; font-size:.8rem;}
.json-tree ul{list-style:none;margin:0;padding-left:1rem;}
.json-tree li{margin:.15rem 0;position:relative;}
.json-tree .node-key{color:#c92c2c;font-weight:600;}
.json-tree .node-value-string{color:#2f9e44;}
.json-tree .node-value-number{color:#1c7ed6;}
.json-tree .node-value-boolean{color:#9d4edd;}
.json-tree .node-toggle{cursor:pointer;display:inline-flex;align-items:center;gap:.25rem;color:var(--text-secondary);}
.json-tree .collapsed>ul{display:none;}
.json-view-toggle {display:flex; gap:.5rem; margin-top:.75rem;}

/* Usage Stats Modal */
.modal{position:fixed;inset:0;display:none;align-items:center;justify-content:center;z-index:3000;}
.modal[aria-hidden='false']{display:flex;}
.modal-backdrop{position:absolute;inset:0;background:rgba(0,0,0,.45);backdrop-filter:blur(3px);}
.modal-content{position:relative;background:var(--surface-color);border:1px solid var(--border-color);border-radius:14px;max-width:760px;width:90%;max-height:85vh;display:flex;flex-direction:column;box-shadow:0 8px 32px -4px rgba(0,0,0,.4);}
.modal-header{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.25rem;border-bottom:1px solid var(--border-color);} 
.modal-body{padding:1rem 1.25rem;overflow:auto;}
.modal-footer{padding:.8rem 1.25rem;border-top:1px solid var(--border-color);display:flex;justify-content:flex-end;gap:.5rem;}
.modal-close{background:transparent;border:none;color:var(--text-secondary);cursor:pointer;font-size:1.1rem;}
.modal-close:hover{color:var(--text-color);} 
.usage-table-wrapper{overflow:auto;margin-top:.5rem;}
.usage-table{width:100%;border-collapse:collapse;font-size:.8rem;}
.usage-table th,.usage-table td{padding:.5rem .6rem;border-bottom:1px solid var(--border-color);text-align:left;white-space:nowrap;}
.usage-table th{background:var(--surface-color);position:sticky;top:0;z-index:1;}
.usage-table tbody tr:hover{background:rgba(0,0,0,.04);} 
[data-theme='dark'] .usage-table tbody tr:hover{background:rgba(255,255,255,.06);} 
#resetUsageBtn{background:var(--accent-color);}#resetUsageBtn:hover{filter:brightness(1.1);} 

/* 触发按钮（可放在页脚或导航后续加入） */
.usage-trigger-btn{position:fixed;left:18px;bottom:18px;z-index:1499;background:var(--surface-color);color:var(--text-secondary);border:1px solid var(--border-color);padding:.6rem .9rem;border-radius:10px;font-size:.75rem;font-weight:600;cursor:pointer;display:flex;align-items:center;gap:.4rem;box-shadow:0 4px 16px -4px rgba(0,0,0,.25);transition:.25s;} 
.usage-trigger-btn:hover{color:var(--text-color);transform:translateY(-2px);} 
[data-theme='dark'] .usage-trigger-btn{background:#1f2733;}