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

:root {
    --bg-color: #f5f6fa;
    --text-color: #2d3436;
    --card-bg: white;
    --shadow-color: rgba(0,0,0,.1);
    --tag-bg: #f5f6fa;
    --tag-color: #666;
}

/* 暗黑模式变量 */
.dark-mode {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --card-bg: #2d2d2d;
    --shadow-color: rgba(0,0,0,.3);
    --tag-bg: #404040;
    --tag-color: #666;
}

body {
    display: flex;
    min-height: 100vh;
    color: var(--text-color);
    font-family: 'Segoe UI', system-ui, sans-serif;
    background-color: var(--bg-color);
    flex-direction: column;
    transition: background-color .3s ease;
}

a {
	transition: all .25s;
	text-decoration: initial;
}

a:hover {
	text-decoration: none;
}

.hidden {
    display: none!important;
}

.navbar {
    display: flex;
    padding: .5rem 2rem;
    justify-content: space-between;
    align-items: center;
    background-color: var(--card-bg);
    box-shadow: 0 2px 10px var(--shadow-color);
}

.logo {
    color: var(--text-color);
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
}

.login-btn {
    color: var(--text-color);
}

.container {
    max-width: 1440px;
    width: 100%;
    flex: 1;
    padding: 0 1rem;
    margin: 1.5rem auto;
}

.sidebar {
    padding: 1rem;
    margin-bottom: 1.5rem;
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 6px rgba(0,0,0,.05);
}

.category-box {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
}

.category-btn {
    color: var(--text-color);
    padding: .5rem 1rem;
    border: none;
    background-color: var(--tag-bg);
    border-radius: 20px;
    transition: all .2s;
    cursor: pointer;
}

.category-btn.active {
    background-color: #1a1a1a;
    color: #fff;
}

.sidebar .search-box {
    display: none;
}

.search-box {
    position: relative;
    width: 40%;
}

.search-input {
    width: 100%;
    color: var(--text-color);
    font-size: 1rem;
    padding: .725rem 3rem .725rem 1rem;
    background-color: var(--card-bg);
    border: 2px solid var(--tag-bg);
    border-radius: 25px;
}

.search-btn {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    color: var(--tag-color);
    padding: .75rem 1rem;
    cursor: pointer;
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(20rem, 1fr));
    gap: 1.5rem;
}

.tool-card {
    position: relative;
    padding: 1.5rem;
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 6px var(--shadow-color);
    transition: transform .2s, box-shadow .2s;
    cursor: pointer;
}

.tool-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px var(--shadow-color);
}

.tool-header {
    display: flex;
    align-items: center;
    gap: .8rem;
    margin-bottom: .5rem;
}

.tool-icon {
    display: flex;
    width: 2.5rem;
    height: 2.5rem;
    color: var(--text-color);
    font-size: 1.5rem;
    align-items: center;
    justify-content: center;
    background-color: var(--tag-bg);
    border-radius: .5rem;
}

.tool-center {
    width: calc(100% - 2.5rem);
}

.tool-title {
    font-size: 1.1rem;
    white-space: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
}

.tool-category {
    margin-top: .5rem;
    overflow: hidden;
}

.category-tag {
    display: inline-block;
    max-width: 100%;
    color: var(--tag-color);
    font-size: .8rem;
    padding: .3rem .8rem;
    background-color: var(--tag-bg);
    border-radius: 1rem;
    white-space: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
    transition: all .3s ease;
}

.tool-desc {
    display: -webkit-box;
    height: 2.8em;
    line-height: 1.4;
    color: var(--tag-color);
    font-size: .9rem;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.tool-favorite {
    position: absolute;
    top: 1rem;
    right: 1rem;
    color: #ccc;
    transition: color .2s;
    cursor: pointer;
    z-index: 1;
}

.tool-favorite.active {
    color: #ff4757;
}

/* 全屏模式切换按钮 */
.screen-toggle {
    position: fixed;
    display: flex;
    bottom: 10rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 50%;
    background-color: var(--card-bg);
    box-shadow: 0 4px 12px var(--shadow-color);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: all .3s cubic-bezier(.4, 0, .2, 1);
}

.screen-toggle i {
    font-size: 1.2rem;
    color: var(--text-color);
    transition: transform .3s ease;
}

/* 暗黑模式切换按钮 */
.theme-toggle {
    position: fixed;
    display: flex;
    bottom: 6rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 50%;
    background-color: var(--card-bg);
    box-shadow: 0 4px 12px var(--shadow-color);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: all .3s cubic-bezier(.4, 0, .2, 1);
}

.theme-toggle:hover {
    transform: scale(1.1) rotate(180deg);
}

.theme-toggle i {
    font-size: 1.2rem;
    color: var(--text-color);
    transition: transform .3s ease;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    display: flex;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 50%;
    background-color: var(--card-bg);
    box-shadow: 0 4px 12px var(--shadow-color);
    opacity: 0;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: all .3s ease;
}

.back-to-top.show {
    opacity: 1;
}

.back-to-top i {
    color: var(--text-color);
    font-size: 1.2rem;
}

/* 底部版权声明 */
.footer {
    color: var(--text-color);
    text-align: center;
    padding: 1rem;
    margin-top: auto;
    border-top: 1px solid var(--tag-bg);
    background-color: var(--card-bg);
}

@media (max-width: 768px) {
    .navbar {
        padding: 1rem;
    }

    .navbar .search-box {
        display: none;
    }

    .sidebar .search-box {
        display: block;
        width: 100%;
        margin-bottom: 1rem;
    }

    .full-screen-btn {
        display: none;
    }
    
    .tool-grid {
        grid-template-columns: 1fr;
    }
}