/*
 * Premium Liquid Glass 特效主题
 * ================================
 * 设计语言：流动玻璃 + 全局动效 + 极致交互
 *
 * 特效体系：
 * 1. 全局背景光斑流动
 * 2. 卡片入场动画（错开缩放）
 * 3. 3D 悬浮 tilt 效果
 * 4. 点击涟漪反馈
 * 5. Hover 光泽扫过
 * 6. 边框渐变流光
 * 7. 滚动渐入动画
 */

/* ========================================
   Liquid Glass 主题变量
   ======================================== */

body {
    /* 核心色板 */
    --tool-bg: #09090b;
    --tool-bg-alt: #18181b;
    --tool-bg-elevated: #27272a;
    --tool-surface: rgba(255, 255, 255, 0.03);
    --tool-surface-hover: rgba(255, 255, 255, 0.06);
    --tool-border: rgba(255, 255, 255, 0.08);
    --tool-border-hover: rgba(255, 255, 255, 0.15);
    --tool-fg: #fafafa;
    --tool-fg-dim: #a1a1aa;
    --tool-fg-muted: #71717a;

    /* 强调色 */
    --tool-accent: #a78bfa;
    --tool-accent-glow: rgba(167, 139, 250, 0.4);
    --tool-accent-2: #22d3ee;
    --tool-accent-2-glow: rgba(34, 211, 238, 0.4);
    --tool-accent-3: #f472b6;
    --tool-accent-3-glow: rgba(244, 114, 182, 0.4);

    /* 玻璃效果 */
    --tool-glass-bg: rgba(255, 255, 255, 0.02);
    --tool-glass-border: rgba(255, 255, 255, 0.06);
    --tool-glass-blur: 20px;

    /* 动效参数 */
    --tool-ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --tool-ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --tool-duration-fast: 150ms;
    --tool-duration-normal: 250ms;
    --tool-duration-slow: 400ms;
}

/* ========================================
   基础布局
   ======================================== */

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', sans-serif;
    font-size: 14px;
    line-height: 1.5;
    background: var(--tool-bg);
    color: var(--tool-fg);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    position: relative;
    overflow-x: hidden;
}

/* ========================================
   全局动态背景
   ======================================== */

/* 主背景层 */
body {
    background:
        radial-gradient(ellipse 80% 50% at 20% 40%, rgba(167, 139, 250, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(34, 211, 238, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse 50% 30% at 50% 80%, rgba(244, 114, 182, 0.08) 0%, transparent 50%),
        var(--tool-bg);
}

/* 动态光斑容器 */
.bg-orbs {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

/* 浮动光斑 */
.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
    animation: orb-float 20s ease-in-out infinite;
}

.orb-1 {
    width: 400px;
    height: 400px;
    background: var(--tool-accent-glow);
    top: -100px;
    left: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 300px;
    height: 300px;
    background: var(--tool-accent-2-glow);
    top: 50%;
    right: -50px;
    animation-delay: -5s;
}

.orb-3 {
    width: 350px;
    height: 350px;
    background: var(--tool-accent-3-glow);
    bottom: -100px;
    left: 30%;
    animation-delay: -10s;
}

@keyframes orb-float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    25% {
        transform: translate(30px, -30px) scale(1.05);
    }
    50% {
        transform: translate(-20px, 20px) scale(0.95);
    }
    75% {
        transform: translate(20px, 30px) scale(1.02);
    }
}

/* 网格纹理 */
.grid-pattern {
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    z-index: 0;
}

/* ========================================
   容器
   ======================================== */

body .container {
    width: 95vw;
    max-width: 1200px;
    margin: 0 auto;
    padding: 3vw 2vw;
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

/* ========================================
   头部 - 简洁高端
   ======================================== */

body header {
    background: transparent;
    color: var(--tool-fg);
    padding: 2vw 0 2.5vw;
    border-bottom: 1px solid var(--tool-border);
    margin-bottom: 3vw;
    position: relative;
}

body .header-search {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2vw;
    flex-wrap: wrap;
}

body .header-content {
    position: relative;
}

/* ========================================
   标题 - 渐变文字
   ======================================== */

body .header-content::before {
    content: 'root@coax';
    color: var(--tool-fg-muted);
    font-weight: 500;
    margin-right: 0.5vw;
}

body .editable-title {
    display: inline-flex;
    align-items: center;
    gap: 0.5vw;
}

body .title-text {
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.1vw 0.3vw;
    border: 1px solid transparent;
    background: linear-gradient(var(--tool-bg), var(--tool-bg)) padding-box,
                linear-gradient(135deg, var(--tool-accent), var(--tool-accent-2), var(--tool-accent-3)) border-box;
    color: var(--tool-fg);
    letter-spacing: -0.02em;
    transition: all var(--tool-duration-normal) var(--tool-ease-out);
}

body .title-text:hover {
    background: linear-gradient(var(--tool-surface-hover), var(--tool-surface-hover)) padding-box,
                linear-gradient(135deg, var(--tool-accent), var(--tool-accent-2), var(--tool-accent-3)) border-box;
    box-shadow: 0 0 30px var(--tool-accent-glow);
}

body .title-text::after {
    content: '_';
    color: var(--tool-accent);
    animation: title-blink 1s steps(1) infinite;
}

@keyframes title-blink {
    0%, 60% { opacity: 1; }
    61%, 100% { opacity: 0; }
}

body .title-input {
    font-size: 1.5rem;
    background: var(--tool-surface);
    border: 1px solid var(--tool-accent);
    color: var(--tool-fg);
    padding: 0.1vw 0.3vw;
    font-family: inherit;
    width: 16vw;
    border-radius: 8px;
}

body .title-input:focus {
    outline: none;
    box-shadow: 0 0 20px var(--tool-accent-glow);
}

body .title-edit-btn {
    background: var(--tool-surface);
    border: 1px solid var(--tool-border);
    color: var(--tool-fg-dim);
    cursor: pointer;
    padding: 0.3vw 0.8vw;
    font-family: inherit;
    font-size: 0.8rem;
    transition: all var(--tool-duration-fast) ease;
    border-radius: 6px;
    letter-spacing: 0.05em;
}

body .title-edit-btn:hover {
    border-color: var(--tool-accent);
    color: var(--tool-fg);
    background: var(--tool-surface-hover);
}

/* ========================================
   搜索框 - 玻璃态
   ======================================== */

body .search-box {
    display: flex;
    align-items: center;
    background: var(--tool-glass-bg);
    backdrop-filter: blur(var(--tool-glass-blur));
    -webkit-backdrop-filter: blur(var(--tool-glass-blur));
    border: 1px solid var(--tool-glass-border);
    padding: 0.7vw 1.2vw;
    min-width: 260px;
    border-radius: 12px;
    position: relative;
    transition: all var(--tool-duration-normal) var(--tool-ease-out);
}

/* 搜索框左侧图标 */
body .search-box::before {
    content: '';
    width: 16px;
    height: 16px;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%23a1a1aa'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cpath d='m21 21-4.35-4.35'/%3E%3C/svg%3E") center/contain no-repeat;
    margin-right: 0.8vw;
    flex-shrink: 0;
    transition: all var(--tool-duration-fast) ease;
}

body .search-box:focus-within {
    border-color: var(--tool-accent);
    box-shadow: 0 0 0 3px var(--tool-accent-glow), 0 8px 32px rgba(0, 0, 0, 0.3);
    transform: translateY(-1px);
}

body .search-box:focus-within::before {
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%23a78bfa'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cpath d='m21 21-4.35-4.35'/%3E%3C/svg%3E") center/contain no-repeat;
}

body .search-box input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--tool-fg);
    font-family: inherit;
    font-size: 0.95rem;
    padding: 0;
    width: 100%;
}

body .search-box input:focus {
    outline: none;
    box-shadow: none;
}

body .search-box input::placeholder {
    color: var(--tool-fg-muted);
}

body .search-hint {
    color: var(--tool-fg-muted);
    font-size: 0.75rem;
    margin-left: 0.8vw;
    padding: 0.2vw 0.5vw;
    background: var(--tool-surface);
    border-radius: 4px;
    border: 1px solid var(--tool-border);
}

/* ========================================
   无结果提示
   ======================================== */

body .no-results {
    text-align: center;
    padding: 6vw 2vw;
    color: var(--tool-fg-dim);
}

body .no-results p {
    font-size: 1rem;
    opacity: 0.6;
}

/* ========================================
   主内容
   ======================================== */

body main {
    padding: 0;
}

/* ========================================
   分类区块
   ======================================== */

body .tool-category {
    margin-bottom: 3vw;
    position: relative;
}

/* 分类间分隔 */
body .tool-category + .tool-category {
    padding-top: 1vw;
}

body .category-header {
    color: var(--tool-fg);
    font-size: 0.85rem;
    padding: 0.6vw 0;
    margin-bottom: 1.2vw;
    display: flex;
    align-items: center;
    gap: 0.8vw;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

body .category-icon {
    opacity: 0.8;
    width: 20px;
    height: 20px;
}

body .category-icon svg {
    width: 100%;
    height: 100%;
}

body .category-name {
    color: var(--tool-fg);
}

body .category-count {
    color: var(--tool-fg-muted);
    font-size: 0.75rem;
    margin-left: auto;
    font-weight: 400;
}

/* ========================================
   工具网格
   ======================================== */

body .category-tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.2vw;
}

body .tools-grid {
    display: block;
}

/* ========================================
   工具卡片 - 液态玻璃特效
   ======================================== */

body .tool-card {
    position: relative;
    background: var(--tool-glass-bg);
    backdrop-filter: blur(var(--tool-glass-blur));
    -webkit-backdrop-filter: blur(var(--tool-glass-blur));
    border: 1px solid var(--tool-glass-border);
    padding: 1.5vw;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.6vw;
    border-radius: 16px;
    transition:
        transform var(--tool-duration-normal) var(--tool-ease-out),
        box-shadow var(--tool-duration-normal) var(--tool-ease-out),
        border-color var(--tool-duration-fast) ease,
        background var(--tool-duration-fast) ease;
    transform-style: preserve-3d;
    perspective: 1000px;

    /* 入场动画初始状态 */
    opacity: 0;
    transform: translateY(20px) scale(0.96);
}

/* 卡片入场动画 */
body .tool-card.animate {
    animation: card-enter var(--tool-duration-slow) var(--tool-ease-out) forwards;
}

@keyframes card-enter {
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* 3D 悬浮效果 */
body .tool-card:hover,
body .tool-card:focus {
    background: var(--tool-surface-hover);
    border-color: rgba(167, 139, 250, 0.3);
    transform:
        translateY(-4px)
        scale(1.02);
    box-shadow:
        0 20px 40px rgba(0, 0, 0, 0.4),
        0 0 60px rgba(167, 139, 250, 0.1);
}

/* 悬浮光效层 */
body .tool-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 16px;
    background: linear-gradient(
        135deg,
        rgba(255, 255, 255, 0.1) 0%,
        transparent 50%
    );
    opacity: 0;
    transition: opacity var(--tool-duration-normal) ease;
    pointer-events: none;
}

body .tool-card:hover::before {
    opacity: 1;
}

/* 点击涟漪效果 */
body .tool-card::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 16px;
    background: radial-gradient(
        circle at var(--ripple-x, 50%) var(--ripple-y, 50%),
        rgba(167, 139, 250, 0.4) 0%,
        transparent 70%
    );
    opacity: 0;
    transform: scale(0);
    transition: transform 0.5s var(--tool-ease-out), opacity 0.5s ease;
    pointer-events: none;
}

body .tool-card.ripple::after {
    animation: ripple-effect 0.6s var(--tool-ease-out) forwards;
}

@keyframes ripple-effect {
    to {
        transform: scale(2);
        opacity: 0;
    }
}

/* 卡片标题 */
body .tool-card h3 {
    color: var(--tool-fg);
    font-size: 1rem;
    font-weight: 500;
    margin: 0;
    letter-spacing: -0.01em;
    transition: color var(--tool-duration-fast) ease;
}

body .tool-card:hover h3 {
    color: var(--tool-accent);
}

/* 卡片描述 */
body .tool-card p {
    color: var(--tool-fg-dim);
    margin: 0;
    font-size: 0.85rem;
    line-height: 1.5;
    opacity: 0.8;
    transition: all var(--tool-duration-fast) ease;
}

body .tool-card:hover p {
    opacity: 1;
}

/* 卡片图标 */
body .tool-card .card-icon {
    font-size: 1.8rem;
    margin-bottom: 0.3vw;
    display: block;
    line-height: 1;
    transition: transform var(--tool-duration-normal) var(--tool-ease-spring);
}

body .tool-card:hover .card-icon {
    transform: scale(1.1) translateY(-2px);
}

body .tool-card .card-icon svg {
    width: 28px;
    height: 28px;
}

/* 卡片箭头 */
body .tool-card .card-arrow {
    position: absolute;
    bottom: 1.2vw;
    right: 1.2vw;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--tool-surface);
    border-radius: 50%;
    opacity: 0;
    transform: translateX(-8px);
    transition: all var(--tool-duration-normal) var(--tool-ease-out);
}

body .tool-card .card-arrow::after {
    content: '→';
    color: var(--tool-accent);
    font-size: 0.9rem;
}

body .tool-card:hover .card-arrow {
    opacity: 1;
    transform: translateX(0);
}

/* 打字机光标 */
body .type-cursor {
    background: var(--tool-accent);
    box-shadow: 0 0 10px var(--tool-accent-glow);
}

/* ========================================
   按钮 - 玻璃态 + 动效
   ======================================== */

body .btn,
body button,
body input[type="submit"],
body input[type="button"] {
    position: relative;
    background: var(--tool-glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--tool-glass-border);
    color: var(--tool-fg);
    padding: 0.7vw 1.8vw;
    font-family: inherit;
    font-size: 0.9rem;
    cursor: pointer;
    border-radius: 10px;
    transition: all var(--tool-duration-normal) var(--tool-ease-out);
    overflow: hidden;
}

/* 按钮光效 */
body .btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.1),
        transparent
    );
    transition: left 0.5s ease;
}

body .btn:hover::before {
    left: 100%;
}

body .btn:hover,
body button:hover,
body input[type="submit"]:hover,
body input[type="button"]:hover {
    background: var(--tool-surface-hover);
    border-color: var(--tool-accent);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

body .btn:active,
body button:active {
    transform: translateY(0) scale(0.98);
}

body .btn-primary {
    background: linear-gradient(135deg, var(--tool-accent), #8b5cf6);
    border-color: transparent;
    color: white;
}

body .btn-primary:hover {
    background: linear-gradient(135deg, #8b5cf6, var(--tool-accent));
    box-shadow: 0 8px 30px var(--tool-accent-glow);
}

body .btn-secondary {
    background: transparent;
    border-color: var(--tool-border);
}

body .btn-secondary:hover {
    border-color: var(--tool-fg-dim);
}

/* ========================================
   表单元素 - 玻璃态
   ======================================== */

body input[type="text"],
body input[type="number"],
body input[type="password"],
body input[type="email"],
body input[type="url"],
body input[type="search"],
body input[type="date"],
body input[type="datetime-local"],
body textarea,
body select {
    background: var(--tool-glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--tool-glass-border);
    color: var(--tool-fg);
    font-family: inherit;
    font-size: inherit;
    padding: 0.8vw 1vw;
    width: 100%;
    border-radius: 10px;
    transition: all var(--tool-duration-fast) ease;
}

body input:focus,
body textarea:focus,
body select:focus {
    outline: none;
    border-color: var(--tool-accent);
    box-shadow: 0 0 0 3px var(--tool-accent-glow);
}

body input::placeholder,
body textarea::placeholder {
    color: var(--tool-fg-muted);
}

body select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' viewBox='0 0 24 24' stroke='%23a1a1aa'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1vw center;
    padding-right: 3vw;
}

body select option {
    background: var(--tool-bg-alt);
    color: var(--tool-fg);
}

body label {
    color: var(--tool-fg-dim);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.02em;
}

body .form-group {
    margin-bottom: 1.5vw;
}

/* ========================================
   消息提示
   ======================================== */

body .message {
    background: var(--tool-glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--tool-glass-border);
    color: var(--tool-fg);
    padding: 1vw 1.5vw;
    margin: 1.5vw 0;
    font-family: inherit;
    border-radius: 10px;
}

body .message-success {
    border-color: rgba(34, 197, 94, 0.3);
    background: rgba(34, 197, 94, 0.1);
}

body .message-error {
    border-color: rgba(239, 68, 68, 0.3);
    background: rgba(239, 68, 68, 0.1);
}

body .message-info {
    border-color: rgba(59, 130, 246, 0.3);
    background: rgba(59, 130, 246, 0.1);
}

/* ========================================
   页脚
   ======================================== */

body footer {
    background: transparent;
    color: var(--tool-fg-muted);
    border-top: 1px solid var(--tool-border);
    padding: 2.5vw 0;
    margin-top: 5vw;
    font-size: 0.8rem;
}

body .footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1vw;
}

body .footer-content p {
    margin: 0;
    opacity: 0.6;
}

/* ========================================
   主题切换器
   ======================================== */

body .theme-switcher {
    position: fixed;
    top: 1.5vw;
    right: 1.5vw;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--tool-glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--tool-glass-border);
    border-radius: 10px;
    cursor: pointer;
    transition: all var(--tool-duration-fast) ease;
}

body .theme-switcher:hover {
    background: var(--tool-surface-hover);
    border-color: var(--tool-accent);
    transform: scale(1.05);
}

body .theme-switcher svg {
    width: 18px;
    height: 18px;
    color: var(--tool-fg-dim);
}

body .theme-btn.active {
    background: var(--tool-accent);
    color: white;
}

body .theme-btn svg {
    width: 16px;
    height: 16px;
}

/* ========================================
   滚动条
   ======================================== */

body ::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

body ::-webkit-scrollbar-track {
    background: transparent;
}

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

body ::-webkit-scrollbar-thumb:hover {
    background: var(--tool-fg-muted);
}

/* ========================================
   文本选择
   ======================================== */

body ::selection {
    background: var(--tool-accent);
    color: white;
}

/* ========================================
   工具页面
   ======================================== */

body .tool-container {
    padding: 0;
    width: 95vw;
    max-width: 1200px;
}

body .tool-header {
    margin-bottom: 2.5vw;
    padding-bottom: 1.5vw;
    border-bottom: 1px solid var(--tool-border);
}

body .tool-header h1 {
    font-size: 1.8rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

body .tool-header p {
    color: var(--tool-fg-dim);
    margin-top: 0.5vw;
}

/* ========================================
   面板
   ======================================== */

body .input-output-container {
    display: flex;
    gap: 1.5vw;
    margin: 2vw 0;
}

body .panel {
    flex: 1;
    background: var(--tool-glass-bg);
    backdrop-filter: blur(var(--tool-glass-blur));
    -webkit-backdrop-filter: blur(var(--tool-glass-blur));
    border: 1px solid var(--tool-glass-border);
    padding: 1.5vw;
    border-radius: 16px;
}

body .panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1vw;
    padding-bottom: 1vw;
    border-bottom: 1px solid var(--tool-border);
}

body .panel-title {
    color: var(--tool-fg-dim);
    font-size: 0.85rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

body textarea {
    width: 100%;
    min-height: 25vw;
    resize: vertical;
    background: transparent;
    border: none;
    color: var(--tool-fg);
    font-family: inherit;
}

body textarea:focus {
    outline: none;
}

/* ========================================
   结果显示
   ======================================== */

body .result {
    background: var(--tool-glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--tool-accent);
    padding: 1.5vw;
    margin: 1.5vw 0;
    border-radius: 12px;
    box-shadow: 0 0 30px var(--tool-accent-glow);
}

/* ========================================
   减少动画偏好
   ======================================== */

@media (prefers-reduced-motion: reduce) {
    body *,
    body *::before,
    body *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ========================================
   响应式
   ======================================== */

@media (max-width: 768px) {
    body .container {
        padding: 20px 16px;
        width: 100vw;
    }

    body header {
        padding: 16px 0 20px;
    }

    body .header-search {
        flex-direction: column;
        align-items: stretch;
    }

    body .header-content {
        margin-bottom: 16px;
    }

    body .search-box {
        width: 100%;
        min-width: unset;
    }

    body .category-tools-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    body .tool-card {
        padding: 16px;
    }

    body .tool-card:hover,
    body .tool-card:focus {
        transform: translateY(-2px);
    }

    body .input-output-container {
        flex-direction: column;
        gap: 16px;
    }

    body textarea {
        min-height: 200px;
    }

    body footer {
        margin-top: 40px;
        padding: 20px 0;
    }

    body .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

/* ========================================
   Light Mode 变量覆盖
   ======================================== */

body[data-theme="light"] {
    --tool-bg: #f8f9fc;
    --tool-bg-alt: #eef0f5;
    --tool-bg-elevated: #ffffff;
    --tool-surface: rgba(255, 255, 255, 0.7);
    --tool-surface-hover: rgba(167, 139, 250, 0.08);
    --tool-border: rgba(0, 0, 0, 0.08);
    --tool-border-hover: rgba(167, 139, 250, 0.3);
    --tool-fg: #1a1a2e;
    --tool-fg-dim: #4a4a6a;
    --tool-fg-muted: #8888aa;

    --tool-accent: #7c5bf5;
    --tool-accent-glow: rgba(124, 91, 245, 0.3);
    --tool-accent-2: #06b6d4;
    --tool-accent-2-glow: rgba(6, 182, 212, 0.3);
    --tool-accent-3: #ec4899;
    --tool-accent-3-glow: rgba(236, 72, 153, 0.3);

    --tool-glass-bg: rgba(255, 255, 255, 0.5);
    --tool-glass-border: rgba(167, 139, 250, 0.2);
    --tool-glass-blur: 16px;
}