/* ===================================
   拼缘分 - 主样式文件
   =================================== */

/* CSS 变量定义 */
:root {
    /* 主色调 - 暖色系 */
    --primary-color: #e91e63;
    --primary-light: #f8bbd9;
    --primary-dark: #c2185b;
    --secondary-color: #ff7043;
    --secondary-light: #ffccbc;
    --secondary-dark: #f4511e;
    
    /* 辅助色 */
    --accent-pink: #f06292;
    --accent-purple: #ba68c8;
    --accent-orange: #ff8a65;
    --accent-coral: #ff6b6b;
    
    /* 中性色 */
    --text-primary: #2c3e50;
    --text-secondary: #546e7a;
    --text-light: #90a4ae;
    --bg-light: #fff5f6;
    --bg-white: #ffffff;
    --bg-gray: #f5f5f5;
    
    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #e91e63 0%, #ff7043 100%);
    --gradient-pink: linear-gradient(135deg, #f06292 0%, #ec407a 100%);
    --gradient-blue: linear-gradient(135deg, #42a5f5 0%, #478ed1 100%);
    --gradient-purple: linear-gradient(135deg, #ab47bc 0%, #8e24aa 100%);
    --gradient-orange: linear-gradient(135deg, #ffa726 0%, #fb8c00 100%);
    
    /* 阴影 */
    --shadow-sm: 0 2px 4px rgba(233, 30, 99, 0.1);
    --shadow-md: 0 4px 12px rgba(233, 30, 99, 0.15);
    --shadow-lg: 0 8px 24px rgba(233, 30, 99, 0.2);
    --shadow-xl: 0 16px 48px rgba(233, 30, 99, 0.25);
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 50%;
    
    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "Microsoft YaHei", sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

/* 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-base);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-brand {
    font-size: 1.8rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

/* Hero 区域 */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="2" fill="rgba(255,255,255,0.1)"/></svg>');
    background-size: 50px 50px;
    animation: float 20s ease-in-out infinite;
}

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

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.2);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
    padding: 2rem;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.2;
    text-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2.5rem;
    opacity: 0.95;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
    text-align: center;
}

.btn-primary {
    background: white;
    color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: white;
    color: var(--primary-color);
}

.btn-large {
    padding: 1.2rem 3rem;
    font-size: 1.2rem;
}

.btn-block {
    width: 100%;
}

/* 滚动指示器 */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    animation: bounce 2s ease-in-out infinite;
}

.mouse {
    width: 26px;
    height: 40px;
    border: 2px solid white;
    border-radius: 13px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 8px;
    background: white;
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 1.5s ease-in-out infinite;
}

@keyframes scroll {
    0%, 100% { opacity: 1; transform: translateX(-50%) translateY(0); }
    50% { opacity: 0.5; transform: translateX(-50%) translateY(10px); }
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(10px); }
}

/* 淡入动画 */
.fade-in {
    animation: fadeIn 1s ease-out;
}

.fade-in-delay {
    animation: fadeIn 1s ease-out 0.3s both;
}

.fade-in-delay-2 {
    animation: fadeIn 1s ease-out 0.6s both;
}

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

/* 通用区块样式 */
section {
    padding: 5rem 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
    position: relative;
}

.section-title.text-center {
    text-align: center;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

.section-subtitle.text-center {
    text-align: center;
}

/* 介绍区块 */
.intro {
    background: var(--bg-light);
}

.intro-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.intro-text p {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.image-placeholder {
    width: 100%;
    height: 400px;
    border-radius: var(--radius-lg);
    background: var(--gradient-primary);
    box-shadow: var(--shadow-xl);
    position: relative;
    overflow: hidden;
}

.image-placeholder::before {
    content: '❤';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 8rem;
    color: rgba(255, 255, 255, 0.3);
}

.heart-animation {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100px;
    height: 100px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.8; }
    50% { transform: translate(-50%, -50%) scale(1.5); opacity: 0; }
}

/* 核心价值 */
.core-values {
    background: var(--bg-white);
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.value-card {
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    background: white;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    text-align: center;
}

.value-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.value-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.value-icon svg {
    width: 40px;
    height: 40px;
}

.value-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.value-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* CTA 区块 */
.cta {
    background: var(--gradient-primary);
    color: white;
    text-align: center;
    padding: 6rem 0;
}

.cta h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.cta p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

/* 页脚 */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h4 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    color: var(--primary-light);
}

.footer-section p {
    opacity: 0.9;
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.8rem;
}

.footer-section a {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: opacity var(--transition-fast);
}

.footer-section a:hover {
    opacity: 1;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    text-align: center;
    opacity: 0.8;
}

.footer-bottom p {
    margin-bottom: 0.5rem;
}

/* 页面头部 */
.page-header {
    background: var(--gradient-primary);
    color: white;
    padding: 8rem 0 4rem;
    text-align: center;
    margin-top: 60px;
}

.page-header h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.page-header p {
    font-size: 1.3rem;
    opacity: 0.95;
}

/* 特色区块 */
.features-section {
    background: var(--bg-light);
}

.feature-block {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    margin-bottom: 5rem;
}

.feature-block:last-child {
    margin-bottom: 0;
}

.feature-block.reverse {
    direction: rtl;
}

.feature-block.reverse .feature-content {
    direction: ltr;
}

.feature-image {
    position: relative;
}

.gradient-1 {
    background: var(--gradient-pink);
}

.gradient-2 {
    background: var(--gradient-blue);
}

.gradient-3 {
    background: var(--gradient-purple);
}

.gradient-4 {
    background: var(--gradient-orange);
}

.feature-content h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.feature-content p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    padding: 0.8rem 0;
    padding-left: 2rem;
    position: relative;
    color: var(--text-secondary);
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* 数据统计 */
.stats-section {
    background: white;
    padding: 4rem 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.stat-item {
    text-align: center;
    padding: 2rem;
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* 成功案例 */
.success-stories {
    background: var(--bg-light);
}

.story-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 3rem;
    margin-bottom: 3rem;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.story-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-5px);
}

.story-header {
    display: flex;
    align-items: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.story-avatar {
    flex-shrink: 0;
}

.avatar-placeholder {
    width: 100px;
    height: 100px;
    border-radius: var(--radius-full);
    background: var(--gradient-pink);
    box-shadow: var(--shadow-md);
}

.gradient-blue {
    background: var(--gradient-blue) !important;
}

.gradient-purple {
    background: var(--gradient-purple) !important;
}

.gradient-orange {
    background: var(--gradient-orange) !important;
}

.story-info h2 {
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.story-meta {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.story-content blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 2rem;
    margin: 2rem 0;
    font-style: italic;
    color: var(--text-secondary);
    font-size: 1.1rem;
    background: var(--bg-light);
    padding: 1.5rem 2rem;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.story-content p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1rem;
}

/* 用户心声 */
.testimonial-section {
    background: white;
}

.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.testimonial-card {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.testimonial-card:hover {
    background: white;
    box-shadow: var(--shadow-md);
    transform: translateY(-5px);
}

.testimonial-content {
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.testimonial-author {
    color: var(--primary-color);
    font-weight: 600;
}

/* 关于我们 */
.about-section {
    background: var(--bg-light);
}

.about-intro {
    margin-bottom: 5rem;
}

.about-content p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.8;
    font-size: 1.1rem;
}

.about-values {
    background: white;
    padding: 3rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.values-list {
    display: grid;
    gap: 2rem;
}

.value-item {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
}

.value-item-icon {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.value-item-icon svg {
    width: 30px;
    height: 30px;
}

.value-item-content h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 0.8rem;
}

.value-item-content p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 团队介绍 */
.team-section {
    background: white;
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
}

.team-member {
    text-align: center;
    padding: 2rem;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.team-member:hover {
    background: var(--bg-light);
    transform: translateY(-5px);
}

.member-avatar {
    margin-bottom: 1.5rem;
}

.member-avatar .avatar-placeholder {
    width: 150px;
    height: 150px;
    margin: 0 auto;
}

.team-member h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.member-role {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 1rem;
}

.member-desc {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 时间线 */
.story-section {
    background: var(--bg-light);
}

.story-block {
    background: white;
    padding: 3rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.timeline {
    position: relative;
    padding-left: 3rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 10px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gradient-primary);
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: -3rem;
    top: 0;
    width: 22px;
    height: 22px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    border: 3px solid white;
    box-shadow: var(--shadow-md);
}

.timeline-content h3 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 0.8rem;
}

.timeline-content p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 联系方式 */
.contact-section {
    background: var(--bg-light);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.contact-info {
    padding: 2rem;
}

.info-item {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    margin-bottom: 2.5rem;
    padding: 1.5rem;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.info-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(5px);
}

.info-icon {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.info-icon svg {
    width: 24px;
    height: 24px;
}

.info-text h3 {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.info-text p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.info-text .small {
    font-size: 0.9rem;
    color: var(--text-light);
}

.contact-form-wrapper {
    background: white;
    padding: 3rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 1rem;
    border: 2px solid var(--bg-gray);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    transition: all var(--transition-fast);
    background: white;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(233, 30, 99, 0.1);
}

.form-group textarea {
    resize: vertical;
}

/* FAQ */
.faq-section {
    background: white;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.faq-item {
    padding: 2rem;
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.faq-item:hover {
    background: white;
    box-shadow: var(--shadow-md);
    transform: translateY(-5px);
}

.faq-item h3 {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.faq-item p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 响应式设计 */
@media (max-width: 968px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        transition: left var(--transition-base);
        box-shadow: var(--shadow-md);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }
    
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .intro-content,
    .feature-block,
    .feature-block.reverse,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .feature-block.reverse {
        direction: ltr;
    }
    
    .story-header {
        flex-direction: column;
        text-align: center;
    }
    
    .page-header h1 {
        font-size: 2.2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 1rem;
    }
    
    .btn {
        width: 100%;
    }
    
    .values-grid,
    .stats-grid,
    .testimonial-grid,
    .team-grid,
    .faq-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .story-card {
        padding: 2rem 1.5rem;
    }
    
    .contact-form-wrapper {
        padding: 2rem 1.5rem;
    }
}

/* 加载动画 */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--bg-light);
    border-top-color: var(--primary-color);
    border-radius: var(--radius-full);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 工具类 */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-3 { margin-bottom: 3rem; }