/* 全局样式 */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #8b5cf6;
    --accent: #06b6d4;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --bg-dark: #0f172a;
    --bg-sidebar: #1e293b;
    --bg-card: #1e293b;
    --bg-hover: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border: #334155;
    --shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    --glow: 0 0 30px rgba(99, 102, 241, 0.3);
    --header-height: 70px;
    --sidebar-width: 260px;
}

.light-theme {
    --bg-dark: #f8fafc;
    --bg-sidebar: #ffffff;
    --bg-card: #ffffff;
    --bg-hover: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
    --glow: 0 0 30px rgba(99, 102, 241, 0.15);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* 背景动画 */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.bg-animation::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 30%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
                radial-gradient(circle at 70% 70%, rgba(139, 92, 246, 0.08) 0%, transparent 50%),
                radial-gradient(circle at 50% 50%, rgba(6, 182, 212, 0.05) 0%, transparent 50%);
    animation: bgRotate 30s linear infinite;
}

@keyframes bgRotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 顶部导航 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    height: var(--header-height);
}

.light-theme .header {
    background: rgba(248, 250, 252, 0.9);
}

.header-content {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 2rem;
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    -webkit-text-fill-color: white;
}

.header-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.theme-toggle, .menu-toggle, .lang-toggle {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    transition: all 0.3s ease;
}

.theme-toggle:hover, .menu-toggle:hover, .lang-toggle:hover {
    transform: scale(1.05);
    box-shadow: var(--glow);
}

.menu-toggle {
    display: none;
    font-size: 1.5rem;
}

.lang-toggle {
    font-size: 1.1rem;
}

/* 主容器 */
.main-container {
    display: flex;
    max-width: 1600px;
    margin: 0 auto;
    padding-top: var(--header-height);
    min-height: 100vh;
}

/* 侧边栏 */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    position: fixed;
    top: var(--header-height);
    left: 0;
    bottom: 0;
    overflow-y: auto;
    z-index: 100;
    padding: 1.5rem 0;
}

.sidebar-nav {
    padding: 0 0.75rem;
}

.nav-section {
    margin-bottom: 1.5rem;
}

.nav-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0 0.75rem;
    margin-bottom: 0.5rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem 0.75rem;
    border-radius: 10px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: all 0.2s ease;
    margin-bottom: 0.25rem;
}

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

.nav-item.active {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
}

.nav-icon {
    font-size: 1.25rem;
    width: 24px;
    text-align: center;
}

/* 内容区域 */
.content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 2rem;
    position: relative;
    z-index: 1;
}

/* 页面标题 */
.page-header {
    margin-bottom: 2rem;
}

.page-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.page-desc {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* 首页英雄区 */
.home-hero {
    text-align: center;
    padding: 3rem 1rem 2rem;
    max-width: 700px;
    margin: 0 auto;
}

.home-hero h1 {
    font-size: 2.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--text-primary), var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.home-hero p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* 搜索框 */
.search-box {
    position: relative;
    max-width: 500px;
    margin: 0 auto;
}

.search-box input {
    width: 100%;
    padding: 1rem 1.25rem 1rem 3rem;
    border-radius: 16px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: var(--glow);
}

.search-box::before {
    content: '🔍';
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.25rem;
}

/* 分类标签 */
.categories {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.category-btn {
    padding: 0.5rem 1.25rem;
    border-radius: 9999px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.category-btn:hover, .category-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    box-shadow: var(--glow);
}

/* 工具卡片网格 */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
    margin-bottom: 3rem;
}

.tool-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    display: block;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.tool-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    border-color: var(--primary);
}

.tool-card:hover::before {
    transform: scaleX(1);
}

.tool-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(139, 92, 246, 0.1));
}

.tool-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.tool-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.tool-tag {
    display: inline-block;
    padding: 0.25rem 0.625rem;
    background: var(--bg-hover);
    border-radius: 9999px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 1rem;
}

/* 特性展示 */
.feature-section {
    padding: 3rem 0;
    border-top: 1px solid var(--border);
}

.feature-section h2 {
    text-align: center;
    font-size: 1.75rem;
    margin-bottom: 2rem;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    text-align: center;
    padding: 1.5rem;
    background: var(--bg-card);
    border-radius: 16px;
    border: 1px solid var(--border);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.feature-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* 工具页面布局 */
.tool-container {
    max-width: 1000px;
    margin: 0 auto;
}

.tool-workspace {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 2rem;
}

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

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

.form-input, .form-textarea, .form-select {
    width: 100%;
    padding: 0.875rem 1rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--bg-dark);
    color: var(--text-primary);
    font-size: 0.9375rem;
    transition: all 0.3s ease;
    font-family: inherit;
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.form-textarea {
    min-height: 180px;
    resize: vertical;
    line-height: 1.6;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.checkbox-group {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    padding: 0.5rem 0;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}

/* 按钮 */
.btn {
    padding: 0.75rem 1.25rem;
    border-radius: 10px;
    border: none;
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
}

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

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

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

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

.btn-group {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* 结果展示 */
.result-section {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.result-title {
    font-weight: 600;
    color: var(--text-primary);
}

.result-box {
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    min-height: 120px;
    white-space: pre-wrap;
    word-break: break-all;
}

.result-box:empty::before {
    content: '结果将显示在这里...';
    color: var(--text-secondary);
}

/* 时间戳显示 */
.timestamp-display {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.timestamp-card {
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.25rem;
    text-align: center;
}

.timestamp-card .label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.timestamp-card .value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary);
    font-family: 'JetBrains Mono', monospace;
}

.timestamp-card .time {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

/* JSON语法高亮 */
.json-tree {
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
}

.json-key {
    color: #9cdcfe;
}

.json-string {
    color: #ce9178;
}

.json-number {
    color: #b5cea8;
}

.json-boolean {
    color: #569cd6;
}

.json-null {
    color: #569cd6;
}

/* 颜色选择器 */
.color-picker-wrapper {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.color-preview {
    width: 80px;
    height: 80px;
    border-radius: 16px;
    border: 2px solid var(--border);
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.1);
}

.color-inputs {
    flex: 1;
    min-width: 200px;
}

/* 二维码 */
.qrcode-container {
    display: flex;
    justify-content: center;
    padding: 2rem;
    background: white;
    border-radius: 12px;
    margin-top: 1rem;
}

.qrcode-container img {
    max-width: 100%;
}

/* 文本对比 */
.diff-container {
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.8;
}

.diff-line {
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
}

.diff-removed {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
}

.diff-added {
    background: rgba(16, 185, 129, 0.15);
    color: #10b981;
}

.diff-unchanged {
    color: var(--text-secondary);
}

/* 页脚 */
.footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    border-top: 1px solid var(--border);
    margin-left: var(--sidebar-width);
    font-size: 0.875rem;
}

/* Toast提示 */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--success);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    z-index: 3000;
    transform: translateX(150%);
    transition: transform 0.3s ease;
}

.toast.show {
    transform: translateX(0);
}

/* 响应式 */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 240px;
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }

    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .content {
        margin-left: 0;
        padding: 1.5rem;
    }

    .footer {
        margin-left: 0;
    }

    .home-hero h1 {
        font-size: 2rem;
    }

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

    .tool-workspace {
        padding: 1.25rem;
    }

    .timestamp-display {
        grid-template-columns: 1fr;
    }
}

/* 滚动条 */
::-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-secondary);
}

/* 选中文字样式 */
::selection {
    background: var(--primary);
    color: white;
}