/* 二次元风格导航页样式 */

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

body {
    font-family: 'Noto Sans SC', sans-serif;
    background: 
        linear-gradient(135deg, rgba(102, 126, 234, 0.2) 0%, rgba(118, 75, 162, 0.2) 100%),
        url('背景图.jpg') center/cover no-repeat fixed;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* 简化的装饰元素，不遮挡背景图 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="1" fill="%23ffffff" opacity="0.3"><animate attributeName="opacity" values="0.3;0.8;0.3" dur="3s" repeatCount="indefinite"/></circle><circle cx="80" cy="30" r="1" fill="%23ffffff" opacity="0.2"><animate attributeName="opacity" values="0.2;0.6;0.2" dur="4s" repeatCount="indefinite"/></circle><circle cx="60" cy="70" r="1" fill="%23ffffff" opacity="0.4"><animate attributeName="opacity" values="0.4;0.7;0.4" dur="2s" repeatCount="indefinite"/></circle></svg>') repeat;
    z-index: 1;
    opacity: 0.3;
    pointer-events: none;
}

/* 添加浮动动画 */
@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    25% { transform: translateY(-10px) rotate(1deg); }
    50% { transform: translateY(-5px) rotate(-1deg); }
    75% { transform: translateY(-15px) rotate(0.5deg); }
}

/* 背景粒子效果容器 */
#particles-js {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: -1;
}

/* 主容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    position: relative;
    z-index: 2;
}

/* 头部样式 */
.header {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 20px 30px;
    margin-bottom: 30px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 32px rgba(31, 38, 135, 0.37);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
    color: white;
}

.logo i {
    font-size: 2rem;
    color: #ff6b9d;
    animation: heartbeat 2s ease-in-out infinite;
}

.logo h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(45deg, #ff6b9d, #ffc3d2, #c44569);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-info {
    display: flex;
    align-items: center;
    gap: 20px;
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.9rem;
}

.weather {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* 简介区域 */
.intro-section {
    margin-bottom: 40px;
}

.intro-container {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 40px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 32px rgba(31, 38, 135, 0.37);
}

.intro-title {
    color: white;
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 15px;
    text-align: center;
    justify-content: center;
}

.intro-title i {
    color: #ff6b9d;
    font-size: 1.5rem;
    animation: heartbeat 2s ease-in-out infinite;
}

.intro-text {
    text-align: center;
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.8;
}

.intro-text p {
    margin: 15px 0;
    font-size: 1.1rem;
}

.intro-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 30px;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.feature-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.feature-item:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(31, 38, 135, 0.3);
}

.feature-item i {
    font-size: 2rem;
    color: #ff6b9d;
    margin-bottom: 5px;
}

.feature-item span {
    color: white;
    font-weight: 500;
    font-size: 1rem;
}

/* 导航区域 */
.main-content {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.nav-section {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 30px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 32px rgba(31, 38, 135, 0.37);
}

.section-title {
    color: white;
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.section-title i {
    color: #ff6b9d;
    font-size: 1.3rem;
}

/* 资源网格布局 */
.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    padding: 10px 0;
}

/* 资源项目卡片 */
.resource-item {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 25px;
    transition: all 0.4s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(31, 38, 135, 0.37);
    display: flex;
    align-items: center;
    gap: 20px;
}

.resource-item:hover {
    transform: translateY(-8px);
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 20px 40px rgba(31, 38, 135, 0.5);
}

/* 资源图标 */
.resource-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    background: linear-gradient(45deg, #ff6b9d, #ffc3d2);
    flex-shrink: 0;
    transition: all 0.3s ease;
}

.resource-item:hover .resource-icon {
    transform: scale(1.1) rotate(10deg);
    box-shadow: 0 10px 30px rgba(255, 107, 157, 0.4);
}

/* 资源内容 */
.resource-content {
    flex: 1;
}

.resource-content h3 {
    color: white;
    font-size: 1.3rem;
    font-weight: 600;
    margin: 0 0 8px 0;
}

.resource-content p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.95rem;
    margin: 0 0 15px 0;
    line-height: 1.5;
}

/* 资源按钮 */
.resource-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 10px;
    text-decoration: none;
    color: white;
    font-weight: 500;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    font-size: 0.9rem;
    margin-bottom: 10px;
}

.baidu-btn {
    background: linear-gradient(45deg, #4285f4, #34a853);
}

.baidu-btn:hover {
    background: linear-gradient(45deg, #3367d6, #2d8f3f);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(66, 133, 244, 0.4);
}

.xunlei-btn {
    background: linear-gradient(45deg, #ff6b35, #f7931e);
}

.xunlei-btn:hover {
    background: linear-gradient(45deg, #e55a2b, #de7f1a);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 107, 53, 0.4);
}

.quark-btn {
    background: linear-gradient(45deg, #667eea, #764ba2);
}

.quark-btn:hover {
    background: linear-gradient(45deg, #5a6fd8, #6a4190);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

/* 已删除提取码样式 */

/* 联系方式区域 */
.contact-section {
    background: rgba(255, 255, 255, 0.08) !important;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 20px;
    background: rgba(255, 255, 255, 0.1);
    padding: 25px;
    border-radius: 15px;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.contact-item:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(31, 38, 135, 0.3);
}

.contact-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: white;
    background: linear-gradient(45deg, #667eea, #764ba2);
    flex-shrink: 0;
}

.contact-icon.backup {
    background: linear-gradient(45deg, #ff6b9d, #ffc3d2);
}

.contact-info {
    flex: 1;
}

.contact-info h3 {
    color: white;
    font-size: 1.2rem;
    margin: 0 0 8px 0;
    font-weight: 600;
}

.group-number {
    color: #ff6b9d;
    font-size: 1.1rem;
    font-weight: 600;
    margin: 5px 0 15px 0;
    font-family: 'Courier New', monospace;
}

.contact-info p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    margin: 5px 0 15px 0;
}

.join-btn {
    background: linear-gradient(45deg, #43e97b, #38f9d7);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.join-btn:hover {
    background: linear-gradient(45deg, #3dd174, #32e6c5);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(67, 233, 123, 0.4);
}

.backup-btn {
    background: linear-gradient(45deg, #ff6b9d, #ffc3d2);
}

.backup-btn:hover {
    background: linear-gradient(45deg, #e55a87, #ff9a9e);
    box-shadow: 0 5px 15px rgba(255, 107, 157, 0.4);
}

/* 重要说明框 */
.notice-box {
    background: rgba(255, 255, 255, 0.08);
    border: 2px solid rgba(255, 107, 157, 0.3);
    border-radius: 15px;
    padding: 25px;
    margin-top: 20px;
}

.notice-title {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #ff6b9d;
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.notice-title i {
    font-size: 1.2rem;
}

.notice-content p {
    color: rgba(255, 255, 255, 0.8);
    margin: 8px 0;
    line-height: 1.6;
    font-size: 0.9rem;
}

.notice-content p::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 4px;
    background: #ff6b9d;
    border-radius: 50%;
    margin-right: 8px;
    vertical-align: middle;
}

.nav-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

.nav-item {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    padding: 20px;
    text-decoration: none;
    color: white;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 10px;
    position: relative;
    overflow: hidden;
}

.nav-item::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;
}

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

.nav-item:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.2);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.nav-icon {
    width: 60px;
    height: 60px;
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    margin-bottom: 5px;
    position: relative;
    overflow: hidden;
}

.nav-icon::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    transform: scale(0);
    transition: transform 0.5s ease;
}

.nav-item:hover .nav-icon::after {
    transform: scale(1);
}

.nav-item span {
    font-weight: 600;
    font-size: 1rem;
}

.nav-item p {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.7);
    margin: 0;
}

/* 页脚 */
.footer {
    margin-top: 60px;
    text-align: center;
    color: rgba(255, 255, 255, 0.8);
}

.footer-content p {
    margin: 10px 0;
}

.footer i {
    color: #ff6b9d;
    animation: heartbeat 2s ease-in-out infinite;
}

.anime-quote {
    font-style: italic;
    font-size: 1.1rem;
    background: linear-gradient(45deg, #ff6b9d, #ffc3d2, #c44569);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: glow 3s ease-in-out infinite;
}

/* 角色装饰 */
.character-decoration {
    position: fixed;
    pointer-events: none;
    z-index: 10;
}

.character {
    position: absolute;
    font-size: 2rem;
    color: #ff6b9d;
    opacity: 0.6;
    animation: float 6s ease-in-out infinite;
}

.character-1 {
    top: 20%;
    right: 5%;
    animation-delay: 0s;
}

.character-2 {
    bottom: 30%;
    left: 5%;
    animation-delay: 3s;
}

/* 音效按钮 */
.sound-toggle {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 100;
}

#sound-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(45deg, #ff6b9d, #ffc3d2);
    border: none;
    color: white;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(255, 107, 157, 0.4);
}

#sound-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(255, 107, 157, 0.6);
}

/* 动画效果 */
@keyframes heartbeat {
    0%, 50%, 100% { transform: scale(1); }
    25%, 75% { transform: scale(1.1); }
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

@keyframes glow {
    0%, 100% { text-shadow: 0 0 5px rgba(255, 107, 157, 0.5); }
    50% { text-shadow: 0 0 20px rgba(255, 107, 157, 0.8), 0 0 30px rgba(255, 107, 157, 0.6); }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.nav-section {
    animation: fadeIn 0.6s ease-out;
}

.nav-section:nth-child(1) { animation-delay: 0.1s; }
.nav-section:nth-child(2) { animation-delay: 0.2s; }
.nav-section:nth-child(3) { animation-delay: 0.3s; }
.nav-section:nth-child(4) { animation-delay: 0.4s; }

/* ========================================
   移动端优化和响应式设计
   ======================================== */

/* 移动端基础优化 */
@media (max-width: 1024px) {
    /* 平板适配 */
    .container {
        padding: 20px;
    }
    
    .resource-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 20px;
    }
    
    .contact-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 20px;
    }
}

/* 手机横屏和小平板 */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .logo h1 {
        font-size: 1.5rem;
    }
    
    .intro-container {
        padding: 25px;
    }
    
    .intro-title {
        font-size: 1.5rem;
        flex-direction: column;
        gap: 10px;
    }
    
    .intro-features {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 15px;
    }
    
    .nav-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 15px;
    }
    
    .resource-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .resource-item {
        flex-direction: column;
        text-align: center;
        padding: 20px;
    }
    
    .resource-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .contact-item {
        padding: 20px;
        flex-direction: column;
        text-align: center;
        gap: 15px;
    }
    
    .contact-icon {
        width: 50px;
        height: 50px;
        font-size: 1.5rem;
    }
    
    .nav-item {
        padding: 15px;
    }
    
    .nav-icon {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }
    
    .character {
        display: none;
    }
    
    .sound-toggle {
        bottom: 20px;
        right: 20px;
    }
    
    #sound-btn {
        width: 45px;
        height: 45px;
        font-size: 1rem;
    }
}

/* 手机竖屏 - 主要移动端适配 */
@media (max-width: 480px) {
    body {
        font-size: 14px;
        background-attachment: scroll; /* 移动端滚动优化 */
    }
    
    .container {
        padding: 12px;
    }
    
    /* 头部优化 */
    .header {
        padding: 15px 0;
    }
    
    .logo h1 {
        font-size: 1.2rem;
        line-height: 1.3;
    }
    
    .header-info {
        gap: 10px;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .header-info span {
        font-size: 0.85rem;
    }
    
    /* 简介区域优化 */
    .intro-container {
        padding: 20px 15px;
        border-radius: 15px;
    }
    
    .intro-title {
        font-size: 1.3rem;
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
    
    .intro-title i {
        font-size: 1.5rem;
    }
    
    .intro-text p {
        font-size: 1rem;
        line-height: 1.6;
        margin-bottom: 12px;
    }
    
    /* 资源网格优化 */
    .nav-section {
        margin-bottom: 25px;
    }
    
    .nav-section h2 {
        font-size: 1.2rem;
        padding: 12px 15px;
        margin-bottom: 15px;
    }
    
    .resource-grid {
        grid-template-columns: 1fr;
        gap: 15px;
        padding: 0 5px;
    }
    
    .resource-item {
        padding: 15px;
        gap: 12px;
        border-radius: 12px;
        min-height: auto;
    }
    
    .resource-icon {
        width: 50px;
        height: 50px;
        font-size: 1.3rem;
    }
    
    .resource-content h3 {
        font-size: 1rem;
        margin-bottom: 5px;
    }
    
    .resource-content p {
        font-size: 0.85rem;
        line-height: 1.4;
    }
    
    .resource-btn {
        padding: 10px 15px;
        font-size: 0.9rem;
        border-radius: 8px;
        min-width: 100px;
    }
    
    /* 联系方式优化 */
    .contact-section {
        padding: 20px 15px;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .contact-item {
        padding: 15px;
        border-radius: 12px;
    }
    
    .contact-icon {
        width: 50px;
        height: 50px;
        font-size: 1.3rem;
    }
    
    .group-number {
        font-size: 1.1rem;
        letter-spacing: 1px;
    }
    
    .join-btn {
        padding: 10px 20px;
        font-size: 0.9rem;
        border-radius: 8px;
    }
    
    /* 页脚优化 */
    .footer {
        padding: 20px 15px;
        text-align: center;
    }
    
    .footer p {
        font-size: 0.85rem;
        line-height: 1.5;
    }
}

/* 超小屏幕设备 */
@media (max-width: 360px) {
    .container {
        padding: 10px;
    }
    
    .logo h1 {
        font-size: 1.1rem;
    }
    
    .intro-title {
        font-size: 1.2rem;
    }
    
    .intro-text p {
        font-size: 0.95rem;
    }
    
    .resource-item {
        padding: 12px;
    }
    
    .resource-btn {
        padding: 8px 12px;
        font-size: 0.85rem;
    }
    
    .contact-item {
        padding: 12px;
    }
    
    .join-btn {
        padding: 8px 16px;
        font-size: 0.85rem;
    }
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    /* 移除悬停效果，优化触摸体验 */
    .resource-item:hover {
        transform: none;
    }
    
    .resource-btn:hover {
        transform: none;
    }
    
    .contact-item:hover {
        transform: none;
    }
    
    .join-btn:hover {
        transform: none;
    }
    
    /* 增加点击区域 */
    .resource-btn, .join-btn {
        min-height: 44px; /* iOS推荐的最小触摸目标 */
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    /* 触摸反馈 */
    .resource-btn:active, .join-btn:active {
        transform: scale(0.98);
        transition: transform 0.1s ease;
    }
}

/* 横屏手机优化 */
@media (max-width: 812px) and (orientation: landscape) {
    .header {
        padding: 10px 0;
    }
    
    .intro-container {
        padding: 15px;
    }
    
    .intro-title {
        font-size: 1.2rem;
    }
    
    .resource-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
    
    .contact-grid {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    }
}

/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(45deg, #ff6b9d, #ffc3d2);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(45deg, #e55a87, #ff9a9e);
}

/* 加载动画 */
.loading {
    opacity: 0;
    animation: fadeIn 0.5s ease-out forwards;
}

/* 特殊效果 */
.sparkle {
    position: relative;
    overflow: hidden;
}

.sparkle::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.5) 50%, transparent 70%);
    transform: rotate(45deg) translate(-100%, -100%);
    animation: sparkle 2s linear infinite;
}

@keyframes sparkle {
    0% { transform: rotate(45deg) translate(-100%, -100%); }
    100% { transform: rotate(45deg) translate(100%, 100%); }
}

/* 悬浮提示 */
.tooltip {
    position: relative;
}

.tooltip::before {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.8rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 1000;
}

.tooltip:hover::before {
    opacity: 1;
}