/* ============================================
   向日葵远程控制 - 全局样式表
   ============================================ */

/* CSS变量定义 */
:root {
    --primary: #FF8C00;
    --primary-dark: #E07800;
    --primary-light: #FFA940;
    --secondary: #4A90D9;
    --accent: #FFD93D;
    --success: #52C41A;
    --dark: #1A1A2E;
    --darker: #0F0F1A;
    --light: #F8F9FA;
    --white: #FFFFFF;
    --text: #333333;
    --text-light: #666666;
    --text-muted: #999999;
    --border: #E8E8E8;
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-lg: rgba(0, 0, 0, 0.15);
    --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    --gradient-dark: linear-gradient(180deg, var(--dark) 0%, var(--darker) 100%);
    --radius: 8px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
}

/* 重置样式 */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.7;
    color: var(--text);
    background-color: var(--white);
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

a:hover {
    color: var(--primary);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul, ol {
    list-style: none;
}

button {
    cursor: pointer;
    border: none;
    font-family: inherit;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

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

.container-fluid {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ============================================
   头部导航
   ============================================ */
.header {
    background: var(--white);
    box-shadow: 0 2px 20px var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    min-height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.logo-icon {
    width: 42px;
    height: 42px;
    background: var(--gradient-primary);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.logo-text span {
    color: var(--text);
    font-weight: 400;
}

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

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 10px 18px;
    font-size: 0.95rem;
    color: var(--text);
    border-radius: var(--radius);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary);
    background: rgba(255, 140, 0, 0.08);
}

.nav-link.active {
    color: var(--primary);
    font-weight: 500;
}

.nav-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: 0 10px 40px var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    padding: 10px 0;
    z-index: 100;
}

.nav-item:hover .nav-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: block;
    padding: 10px 20px;
    font-size: 0.9rem;
    color: var(--text);
    transition: var(--transition);
}

.dropdown-item:hover {
    background: rgba(255, 140, 0, 0.08);
    color: var(--primary);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 10px;
    background: none;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: var(--transition);
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius);
    transition: var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(255, 140, 0, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 140, 0, 0.4);
    color: var(--white);
}

.btn-secondary {
    background: var(--white);
    color: var(--primary);
    border: 2px solid var(--primary);
}

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

.btn-dark {
    background: var(--dark);
    color: var(--white);
}

.btn-dark:hover {
    background: var(--darker);
    color: var(--white);
}

.btn-sm {
    padding: 8px 18px;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 16px 36px;
    font-size: 1.1rem;
}

/* ============================================
   Hero区域
   ============================================ */
.hero {
    background: var(--gradient-dark);
    color: var(--white);
    padding: 100px 0 120px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 140, 0, 0.15) 0%, transparent 60%);
    pointer-events: none;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-text h1 {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero-text h1 span {
    color: var(--primary);
}

.hero-text .subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 30px;
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 40px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
}

.stat-label {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
    margin-top: 5px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-top: 30px;
}

.hero-image {
    position: relative;
}

.hero-image img {
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

/* ============================================
   功能区块
   ============================================ */
.section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(255, 140, 0, 0.1);
    color: var(--primary);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 20px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 16px;
}

.section-desc {
    font-size: 1.1rem;
    color: var(--text-light);
}

.section-light {
    background: var(--light);
}

/* 功能卡片 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--white);
    padding: 40px 30px;
    border-radius: var(--radius-lg);
    box-shadow: 0 5px 30px var(--shadow);
    transition: var(--transition);
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 50px var(--shadow-lg);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 2.5rem;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}

.feature-desc {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.7;
}

/* ============================================
   产品特点
   ============================================ */
.product-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.product-image {
    position: relative;
}

.product-image img {
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 60px var(--shadow-lg);
}

.product-content h3 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 20px;
}

.product-content p {
    color: var(--text-light);
    margin-bottom: 30px;
    line-height: 1.8;
}

.product-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.product-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    color: var(--text);
}

.product-list li::before {
    content: '✓';
    width: 24px;
    height: 24px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    flex-shrink: 0;
}

/* ============================================
   下载区域
   ============================================ */
.download-section {
    background: var(--gradient-dark);
    color: var(--white);
    padding: 100px 0;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.download-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: 40px;
    text-align: center;
    transition: var(--transition);
}

.download-card:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-5px);
}

.download-icon {
    width: 100px;
    height: 100px;
    background: var(--gradient-primary);
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 3rem;
}

.download-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.download-card p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 24px;
    font-size: 0.95rem;
}

.download-version {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: var(--primary);
    color: var(--white);
    border-radius: var(--radius);
    font-weight: 600;
    transition: var(--transition);
}

.download-btn:hover {
    background: var(--primary-dark);
    color: var(--white);
    transform: translateY(-2px);
}

/* ============================================
   使用场景
   ============================================ */
.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.scenario-card {
    position: relative;
    height: 280px;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.scenario-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.scenario-card:hover img {
    transform: scale(1.1);
}

.scenario-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 30px;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    color: var(--white);
}

.scenario-overlay h4 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.scenario-overlay p {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.8);
}

/* ============================================
   数据统计
   ============================================ */
.stats-section {
    background: var(--gradient-primary);
    color: var(--white);
    padding: 80px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    text-align: center;
}

.stats-item {
    padding: 20px;
}

.stats-number {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1;
    margin-bottom: 10px;
}

.stats-label {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* ============================================
   合作伙伴
   ============================================ */
.partners-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 50px;
}

.partner-item {
    width: 150px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    filter: grayscale(100%);
    opacity: 0.6;
    transition: var(--transition);
}

.partner-item:hover {
    filter: grayscale(0%);
    opacity: 1;
}

.partner-item img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

/* ============================================
   底部
   ============================================ */
.footer {
    background: var(--dark);
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 20px;
}

.footer-desc {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
    line-height: 1.8;
    margin-bottom: 20px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.social-link:hover {
    background: var(--primary);
    color: var(--white);
}

.footer-column h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--white);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
}

.footer-bottom-links {
    display: flex;
    gap: 30px;
}

.footer-bottom-links a:hover {
    color: var(--white);
}

/* ============================================
   表单
   ============================================ */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--white);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 140, 0, 0.1);
}

.form-textarea {
    min-height: 150px;
    resize: vertical;
}

/* ============================================
   面包屑
   ============================================ */
.breadcrumb {
    background: var(--light);
    padding: 16px 0;
    margin-bottom: 0;
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text-light);
}

.breadcrumb-list li:not(:last-child)::after {
    content: '/';
    margin-left: 8px;
    color: var(--text-muted);
}

.breadcrumb-list a:hover {
    color: var(--primary);
}

.breadcrumb-list li:last-child {
    color: var(--text);
    font-weight: 500;
}

/* ============================================
   页面标题
   ============================================ */
.page-header {
    background: var(--gradient-dark);
    color: var(--white);
    padding: 80px 0;
    text-align: center;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.page-desc {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.8);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   常见问题
   ============================================ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--white);
    border-radius: var(--radius);
    margin-bottom: 16px;
    box-shadow: 0 2px 10px var(--shadow);
    overflow: hidden;
}

.faq-question {
    padding: 20px 24px;
    font-weight: 600;
    color: var(--dark);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--primary);
}

.faq-question::after {
    content: '+';
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--text-muted);
}

.faq-item.active .faq-question::after {
    content: '-';
    color: var(--primary);
}

.faq-answer {
    padding: 0 24px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    padding: 0 24px 20px;
    max-height: 500px;
}

.faq-answer p {
    color: var(--text-light);
    line-height: 1.8;
}

/* ============================================
   帮助文章列表
   ============================================ */
.help-grid {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 40px;
}

.help-sidebar {
    position: sticky;
    top: 100px;
}

.help-category {
    background: var(--white);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: 0 2px 10px var(--shadow);
}

.help-category h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.help-category-links {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.help-category-links a {
    padding: 10px 14px;
    border-radius: var(--radius);
    font-size: 0.95rem;
    color: var(--text);
    transition: var(--transition);
}

.help-category-links a:hover,
.help-category-links a.active {
    background: rgba(255, 140, 0, 0.1);
    color: var(--primary);
}

.help-content {
    background: var(--white);
    border-radius: var(--radius);
    padding: 40px;
    box-shadow: 0 2px 10px var(--shadow);
}

.help-content h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 20px;
}

.help-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--dark);
    margin: 30px 0 16px;
}

.help-content p {
    color: var(--text-light);
    margin-bottom: 16px;
    line-height: 1.8;
}

.help-content ul {
    margin: 16px 0;
    padding-left: 24px;
}

.help-content ul li {
    list-style: disc;
    color: var(--text-light);
    margin-bottom: 8px;
    line-height: 1.7;
}

.help-content ol {
    margin: 16px 0;
    padding-left: 24px;
}

.help-content ol li {
    list-style: decimal;
    color: var(--text-light);
    margin-bottom: 8px;
    line-height: 1.7;
}

.help-content pre {
    background: var(--dark);
    color: #f8f8f2;
    padding: 20px;
    border-radius: var(--radius);
    overflow-x: auto;
    margin: 16px 0;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9rem;
}

.help-toc {
    background: var(--light);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 30px;
}

.help-toc h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 12px;
}

.help-toc ol {
    padding-left: 20px;
}

.help-toc ol li {
    list-style: decimal;
    margin-bottom: 8px;
}

.help-toc ol li a {
    color: var(--primary);
    font-size: 0.95rem;
}

/* ============================================
   关于页面
   ============================================ */
.about-intro {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-content h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 24px;
}

.about-content p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-values {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-top: 40px;
}

.value-item {
    text-align: center;
    padding: 30px;
    background: var(--light);
    border-radius: var(--radius-lg);
}

.value-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    font-size: 1.5rem;
}

.value-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 8px;
}

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

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.team-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 5px 20px var(--shadow);
    text-align: center;
}

.team-avatar {
    width: 100%;
    height: 250px;
    background: var(--light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: var(--text-muted);
}

.team-info {
    padding: 24px;
}

.team-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 4px;
}

.team-role {
    font-size: 0.9rem;
    color: var(--primary);
    margin-bottom: 12px;
}

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

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .product-showcase {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-intro {
        grid-template-columns: 1fr;
    }
    
    .help-grid {
        grid-template-columns: 1fr;
    }
    
    .help-sidebar {
        position: static;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 40px var(--shadow-lg);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero {
        padding: 60px 0 80px;
    }
    
    .hero-text h1 {
        font-size: 2rem;
    }
    
    .hero-stats {
        flex-wrap: wrap;
        gap: 20px;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .features-grid,
    .download-grid,
    .scenarios-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
    
    .page-title {
        font-size: 1.75rem;
    }
}

/* ============================================
   动画
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fadeInUp {
    animation: fadeInUp 0.6s ease forwards;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.pulse {
    animation: pulse 2s ease infinite;
}

/* ============================================
   工具类
   ============================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-primary { color: var(--primary); }
.text-muted { color: var(--text-muted); }
.mt-1 { margin-top: 10px; }
.mt-2 { margin-top: 20px; }
.mt-3 { margin-top: 30px; }
.mt-4 { margin-top: 40px; }
.mb-1 { margin-bottom: 10px; }
.mb-2 { margin-bottom: 20px; }
.mb-3 { margin-bottom: 30px; }
.mb-4 { margin-bottom: 40px; }
.py-1 { padding-top: 10px; padding-bottom: 10px; }
.py-2 { padding-top: 20px; padding-bottom: 20px; }
.py-3 { padding-top: 30px; padding-bottom: 30px; }
.py-4 { padding-top: 40px; padding-bottom: 40px; }