:root {
    --bg: #f5f6f8;
    --surface: #ffffff;
    --surface2: #f0f2f5;
    --text: #1a1d23;
    --text2: #5f6368;
    --text3: #9aa0a6;
    --border: #e2e5e9;
    --primary: #4f6ef7;
    --primary-hover: #3b56e0;
    --primary-light: #eef1fe;
    --accent: #10b981;
    --accent-light: #ecfdf5;
    --warning: #f59e0b;
    --warning-light: #fffbeb;
    --danger: #ef4444;
    --danger-light: #fef2f2;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.06), 0 4px 16px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.08), 0 4px 12px rgba(0, 0, 0, 0.05);
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', 'Monaco', 'Menlo', monospace;
    --sidebar-width: 230px;
}

[data-theme="dark"] {
    --bg: #0f1117;
    --surface: #1a1d27;
    --surface2: #222530;
    --text: #e8eaed;
    --text2: #9ca0a8;
    --text3: #5f6368;
    --border: #2d313a;
    --primary: #6b8aff;
    --primary-hover: #8aa4ff;
    --primary-light: #1a2040;
    --accent: #34d399;
    --accent-light: #0d2818;
    --warning: #fbbf24;
    --warning-light: #1f1a0d;
    --danger: #f87171;
    --danger-light: #1f1313;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.3), 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.4), 0 4px 12px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    transition: background var(--transition), color var(--transition);
    display: flex;
}

/* 侧边栏 */
.sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: all var(--transition);
    overflow-y: auto;
    padding: 16px 10px;
    flex-shrink: 0;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}
.sidebar::-webkit-scrollbar {
    width: 4px;
}
.sidebar::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px 20px;
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text);
    text-decoration: none;
}
.sidebar-logo .logo-icon {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: #fff;
    flex-shrink: 0;
}
.sidebar-nav {
    list-style: none;
    flex: 1;
}
.sidebar-nav li {
    margin-bottom: 2px;
}
.sidebar-nav button {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 9px 12px;
    border: none;
    background: transparent;
    color: var(--text2);
    cursor: pointer;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    transition: all var(--transition);
    text-align: left;
    font-family: inherit;
    white-space: nowrap;
    letter-spacing: 0.01em;
}
.sidebar-nav button:hover {
    background: var(--surface2);
    color: var(--text);
}
.sidebar-nav button.active {
    background: var(--primary-light);
    color: var(--primary);
    font-weight: 600;
}
.sidebar-nav button .cat-icon {
    font-size: 1.1rem;
    width: 24px;
    text-align: center;
    flex-shrink: 0;
}
.sidebar-nav button .badge {
    margin-left: auto;
    background: var(--surface2);
    color: var(--text2);
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 500;
}
.sidebar-nav button.active .badge {
    background: var(--primary);
    color: #fff;
}

.sidebar-footer {
    padding-top: 12px;
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: auto;
}
.theme-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    border: none;
    background: var(--surface2);
    color: var(--text);
    cursor: pointer;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    transition: all var(--transition);
    font-family: inherit;
    width: 100%;
}
.theme-toggle:hover {
    background: var(--border);
}

/* 主内容区 */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    min-height: 100vh;
    padding: 20px 24px 40px;
    transition: margin var(--transition);
    max-width: 1300px;
    width: 100%;
}

.page-header {
    margin-bottom: 24px;
}
.page-header h1 {
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 2px;
}
.page-header .subtitle {
    color: var(--text2);
    font-size: 0.9rem;
}

/* 搜索栏 */
.search-bar {
    position: relative;
    margin-bottom: 20px;
    max-width: 500px;
}
.search-bar input {
    width: 100%;
    padding: 11px 16px 11px 42px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--text);
    font-size: 0.95rem;
    font-family: inherit;
    transition: all var(--transition);
    outline: none;
}
.search-bar input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-light);
}
.search-bar .search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text3);
    pointer-events: none;
    font-size: 1.1rem;
}

/* 工具卡片网格 */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 14px;
}
.tool-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px;
    cursor: pointer;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}
.tool-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    border-color: var(--primary);
}
.tool-card .tool-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin-bottom: 12px;
    background: var(--primary-light);
}
.tool-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
    letter-spacing: -0.01em;
}
.tool-card .tool-desc {
    font-size: 0.82rem;
    color: var(--text2);
    line-height: 1.4;
}
.tool-card .tool-tag {
    position: absolute;
    top: 16px;
    right: 16px;
    font-size: 0.7rem;
    padding: 3px 8px;
    border-radius: 6px;
    background: var(--surface2);
    color: var(--text3);
    font-weight: 500;
}

/* 工具详情面板 */
.tool-panel {
    display: none;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 28px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-lg);
    animation: fadeSlideIn 0.25s ease-out;
}
.tool-panel.active {
    display: block;
}
@keyframes fadeSlideIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}
.tool-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}
.tool-panel-header h2 {
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 10px;
}
.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    cursor: pointer;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    transition: all var(--transition);
    font-family: inherit;
}
.btn-back:hover {
    background: var(--surface2);
}
.tool-panel-body {
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.tool-panel-body textarea,
.tool-panel-body input[type="text"],
.tool-panel-body input[type="number"],
.tool-panel-body input[type="date"],
.tool-panel-body input[type="datetime-local"],
.tool-panel-body input[type="file"],
.tool-panel-body select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface2);
    color: var(--text);
    font-size: 0.95rem;
    font-family: var(--font-mono);
    resize: vertical;
    transition: all var(--transition);
    outline: none;
    line-height: 1.5;
}
.tool-panel-body textarea:focus,
.tool-panel-body input:focus,
.tool-panel-body select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-light);
}
.tool-panel-body textarea {
    min-height: 130px;
    font-size: 0.9rem;
}
.tool-panel-body select {
    font-family: inherit;
}
.btn-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 18px;
    border: none;
    cursor: pointer;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition);
    font-family: inherit;
    letter-spacing: 0.01em;
}
.btn-primary {
    background: var(--primary);
    color: #fff;
}
.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: var(--shadow);
}
.btn-outline {
    background: transparent;
    border: 2px solid var(--border);
    color: var(--text);
}
.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}
.btn-sm {
    padding: 6px 12px;
    font-size: 0.8rem;
    border-radius: 6px;
}
.btn-accent {
    background: var(--accent);
    color: #fff;
}
.btn-accent:hover {
    filter: brightness(1.1);
}
.result-box {
    background: var(--surface2);
    border-radius: var(--radius);
    padding: 14px 16px;
    font-family: var(--font-mono);
    font-size: 0.88rem;
    word-break: break-all;
    line-height: 1.6;
    max-height: 300px;
    overflow-y: auto;
    border: 1px solid var(--border);
    color: var(--text);
    white-space: pre-wrap;
    position: relative;
}
.result-box .copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 4px 10px;
    font-size: 0.7rem;
    border-radius: 4px;
    background: var(--surface);
    border: 1px solid var(--border);
    cursor: pointer;
    color: var(--text2);
    transition: all var(--transition);
    font-family: inherit;
}
.result-box .copy-btn:hover {
    background: var(--primary-light);
    color: var(--primary);
}
.label-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text2);
    font-weight: 500;
}
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #1a1d23;
    color: #fff;
    padding: 10px 20px;
    border-radius: 20px;
    font-size: 0.85rem;
    z-index: 9999;
    transition: transform 0.3s ease;
    pointer-events: none;
    letter-spacing: 0.01em;
}
.toast.show {
    transform: translateX(-50%) translateY(0);
}
[data-theme="dark"] .toast {
    background: #e8eaed;
    color: #1a1d23;
}
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text3);
}
.empty-state .icon {
    font-size: 3rem;
    margin-bottom: 12px;
}
hr {
    border-color: var(--border);
    margin: 8px 0;
}

/* 响应式设计 */
@media (max-width: 900px) {
    .sidebar {
        width: 60px;
        padding: 12px 6px;
    }
    .sidebar-logo span,
    .sidebar-nav button span:not(.cat-icon),
    .sidebar-nav button .badge,
    .sidebar-footer .theme-toggle span,
    .sidebar-logo .logo-text {
        display: none;
    }
    .sidebar-logo {
        justify-content: center;
        padding: 4px 0 16px;
    }
    .sidebar-nav button {
        justify-content: center;
        padding: 10px;
        gap: 0;
    }
    .sidebar-nav button .cat-icon {
        font-size: 1.3rem;
        width: auto;
    }
    .main-content {
        margin-left: 60px;
        padding: 16px 12px 30px;
    }
    .tools-grid {
        grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
        gap: 10px;
    }
    .tool-panel {
        padding: 16px;
    }
}
@media (max-width: 600px) {
    .sidebar {
        width: 100%;
        height: auto;
        position: fixed;
        bottom: 0;
        top: auto;
        flex-direction: row;
        padding: 8px 4px;
        border-right: none;
        border-top: 1px solid var(--border);
        overflow-x: auto;
        z-index: 100;
        justify-content: space-around;
    }
    .sidebar-logo,
    .sidebar-footer {
        display: none;
    }
    .sidebar-nav {
        display: flex;
        flex-direction: row;
        gap: 0;
        flex: 1;
        justify-content: space-around;
    }
    .sidebar-nav li {
        margin: 0;
    }
    .sidebar-nav button {
        flex-direction: column;
        gap: 2px;
        padding: 6px 8px;
        font-size: 0.7rem;
        justify-content: center;
        text-align: center;
        border-radius: 6px;
    }
    .sidebar-nav button .cat-icon {
        font-size: 1.1rem;
    }
    .sidebar-nav button .badge {
        display: none;
    }
    .main-content {
        margin-left: 0;
        margin-bottom: 80px;
        padding: 12px 10px 30px;
        max-width: 100%;
    }
    .tools-grid {
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }
    .tool-card {
        padding: 14px;
    }
    .tool-card h3 {
        font-size: 0.9rem;
    }
    .tool-card .tool-desc {
        font-size: 0.75rem;
    }
    .page-header h1 {
        font-size: 1.3rem;
    }
    .search-bar {
        max-width: 100%;
    }
}