/* ===== 全局样式与变量 ===== */
:root {
    /* 主色调 */
    --primary-dark: #0a1628;
    --primary-gold: #d4a853;
    --primary-gold-light: #e8c078;
    
    /* 辅助色 */
    --white: #ffffff;
    --text-light: #ffffff;
    --text-muted: #b8c5d6;
    --bg-light: #f5f7fa;
    --bg-card: #1a2a4a;
    --bg-card-light: rgba(26, 42, 74, 0.8);
    
    /* 渐变 */
    --gradient-hero: linear-gradient(135deg, #0a1628 0%, #1a2a4a 50%, #0a1628 100%);
    --gradient-gold: linear-gradient(135deg, #d4a853, #e8c078);
    
    /* 字体 */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.2);
    --shadow-gold: 0 4px 20px rgba(212, 168, 83, 0.3);
    
    /* 动画 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* 重置与基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-light);
    background: var(--primary-dark);
    overflow-x: hidden;
}

/* 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* 通用标题样式 */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-light);
    text-align: center;
    margin-bottom: var(--spacing-xs);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--gradient-gold);
    margin: var(--spacing-sm) auto 0;
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 22, 40, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(212, 168, 83, 0.1);
    transition: var(--transition-normal);
}

.navbar.scrolled {
    background: rgba(10, 22, 40, 0.95);
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-light);
    text-decoration: none;
    font-weight: 700;
    font-size: 1.3rem;
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-text {
    color: var(--primary-gold);
}

.nav-menu {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.95rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    transition: var(--transition-normal);
    position: relative;
}

.nav-link:hover {
    color: var(--primary-gold);
    background: rgba(212, 168, 83, 0.1);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 30px;
    height: 2px;
    background: var(--primary-gold);
    transition: transform var(--transition-normal);
}

.nav-link:hover::after {
    transform: translateX(-50%) scaleX(1);
}

/* 汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 10px;
    background: none;
    border: none;
    cursor: pointer;
}

.hamburger-line {
    width: 25px;
    height: 2px;
    background: var(--text-light);
    transition: var(--transition-normal);
}

.hamburger.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.hamburger.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== Hero区域 ===== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    padding: var(--spacing-xl) var(--spacing-md);
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-hero);
    z-index: -2;
}

.hero-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    opacity: 0.15;
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 40px,
            rgba(212, 168, 83, 0.03) 40px,
            rgba(212, 168, 83, 0.03) 41px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 40px,
            rgba(212, 168, 83, 0.03) 40px,
            rgba(212, 168, 83, 0.03) 41px
        );
}

.hero-pattern::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"><path d="M10 90 L20 70 L30 80 L40 50 L50 60 L60 30 L70 45 L80 20 L90 40" stroke="%23d4a853" stroke-width="1" fill="none" opacity="0.1"/></svg>');
    background-size: 200px 200px;
    background-repeat: repeat;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    z-index: 1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--text-light);
    margin-bottom: var(--spacing-sm);
    line-height: 1.2;
    animation: fadeInUp 0.8s ease-out;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--primary-gold);
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-tags {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
    letter-spacing: 2px;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease-out 0.6s both;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition-normal);
    border: none;
    will-change: transform, box-shadow;
}

.btn-primary {
    background: var(--gradient-gold);
    color: var(--primary-dark);
    box-shadow: var(--shadow-gold);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(212, 168, 83, 0.4);
    filter: brightness(1.1);
}

.btn-secondary {
    background: transparent;
    color: var(--text-light);
    border: 2px solid var(--primary-gold);
}

.btn-secondary:hover {
    background: var(--primary-gold);
    color: var(--primary-dark);
    box-shadow: var(--shadow-gold);
}

.btn-outline {
    background: transparent;
    color: var(--primary-gold);
    border: 2px solid var(--primary-gold);
}

.btn-outline:hover {
    background: var(--primary-gold);
    color: var(--primary-dark);
}

.btn-buy {
    background: rgba(212, 168, 83, 0.1);
    color: var(--primary-gold);
    border: 1px solid var(--primary-gold);
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
}

.btn-buy:hover {
    background: var(--primary-gold);
    color: var(--primary-dark);
}

.btn-tutorial {
    background: rgba(212, 168, 83, 0.1);
    color: var(--primary-gold);
    border: 1px solid var(--primary-gold);
    width: 100%;
    margin-top: var(--spacing-sm);
}

.btn-tutorial:hover {
    background: var(--primary-gold);
    color: var(--primary-dark);
}

.btn-submit {
    background: var(--gradient-gold);
    color: var(--primary-dark);
    width: 100%;
    padding: 1.2rem 2rem;
    font-size: 1.1rem;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-gold);
}

/* 滚动指示器 */
.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-arrow {
    display: block;
    width: 30px;
    height: 30px;
    border-right: 2px solid var(--primary-gold);
    border-bottom: 2px solid var(--primary-gold);
    transform: rotate(45deg);
}

/* ===== 服务卡片区 ===== */
.services {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(180deg, var(--primary-dark) 0%, var(--bg-card) 100%);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.service-card {
    background: var(--bg-card-light);
    border: 1px solid rgba(212, 168, 83, 0.2);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    text-align: center;
    transition: var(--transition-normal);
    will-change: transform, box-shadow;
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-gold);
}

.service-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.service-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary-gold);
    margin-bottom: var(--spacing-xs);
}

.service-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-sm);
}

.service-list {
    list-style: none;
    margin-bottom: var(--spacing-md);
}

.service-list li {
    color: var(--text-muted);
    padding: 0.5rem 0;
    font-size: 0.9rem;
    position: relative;
}

.service-list li::before {
    content: '•';
    color: var(--primary-gold);
    margin-right: 0.5rem;
}

.service-link {
    color: var(--primary-gold);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-normal);
}

.service-link:hover {
    color: var(--primary-gold-light);
}

/* ===== MT4编程详情区 ===== */
.programming {
    padding: var(--spacing-xl) 0;
    background: var(--bg-card);
}

.pricing-table-wrapper {
    overflow-x: auto;
    margin-bottom: var(--spacing-lg);
}

.pricing-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-card-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.pricing-table th,
.pricing-table td {
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid rgba(212, 168, 83, 0.1);
}

.pricing-table th {
    background: rgba(212, 168, 83, 0.2);
    color: var(--primary-gold);
    font-weight: 600;
    font-size: 0.95rem;
}

.pricing-table td {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.pricing-table tr:last-child td {
    border-bottom: none;
}

.pricing-table tr:hover td {
    background: rgba(212, 168, 83, 0.05);
}

.pricing-table .price {
    color: var(--primary-gold);
    font-weight: 700;
    font-size: 1rem;
}

/* 服务保障 */
.guarantee-box {
    background: rgba(212, 168, 83, 0.1);
    border: 1px solid rgba(212, 168, 83, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.guarantee-title {
    font-size: 1.3rem;
    color: var(--primary-gold);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.guarantee-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

.guarantee-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-muted);
    font-size: 0.95rem;
}

.guarantee-icon {
    color: var(--primary-gold);
}

/* ===== 指标商店 ===== */
.indicators {
    padding: var(--spacing-xl) 0;
    background: var(--primary-dark);
}

.indicators-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.indicator-card {
    background: var(--bg-card-light);
    border: 1px solid rgba(212, 168, 83, 0.15);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    text-align: center;
    position: relative;
    transition: var(--transition-normal);
    will-change: transform;
}

.indicator-card:hover {
    transform: scale(1.05);
    border-color: var(--primary-gold);
    box-shadow: var(--shadow-gold);
}

.indicator-badge {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: var(--primary-gold);
    color: var(--primary-dark);
    padding: 0.3rem 0.8rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
}

.indicator-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.indicator-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-light);
    margin-bottom: var(--spacing-xs);
}

.indicator-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
}

.indicator-price {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

.price-current {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-gold);
}

.price-original {
    font-size: 0.9rem;
    color: var(--text-muted);
    text-decoration: line-through;
}

.view-more-wrapper {
    text-align: center;
    margin-top: var(--spacing-lg);
}

/* ===== 金融教程 ===== */
.tutorials {
    padding: var(--spacing-xl) 0;
    background: var(--bg-card);
}

.tutorials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.tutorial-card {
    background: var(--bg-card-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid rgba(212, 168, 83, 0.1);
    transition: var(--transition-normal);
}

.tutorial-card:hover {
    border-color: var(--primary-gold);
    transform: translateY(-5px);
}

.tutorial-header {
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: center;
}

.tutorial-header.free {
    background: linear-gradient(135deg, #1a3a2a 0%, #2a4a3a 100%);
}

.tutorial-header.paid {
    background: linear-gradient(135deg, #2a2a4a 0%, #3a3a5a 100%);
}

.tutorial-header.vip {
    background: linear-gradient(135deg, rgba(212, 168, 83, 0.3) 0%, rgba(212, 168, 83, 0.2) 100%);
}

.tutorial-type {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-light);
}

.tutorial-content {
    padding: var(--spacing-md);
}

.tutorial-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-gold);
    margin-bottom: var(--spacing-sm);
}

.tutorial-list {
    list-style: none;
    margin-bottom: var(--spacing-md);
}

.tutorial-list li {
    color: var(--text-muted);
    padding: 0.5rem 0;
    font-size: 0.9rem;
    position: relative;
}

.tutorial-list li::before {
    content: '✓';
    color: var(--primary-gold);
    margin-right: 0.5rem;
}

.tutorial-price {
    margin-bottom: var(--spacing-sm);
}

.price-tag {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary-gold);
}

.price-tag.free {
    color: #4ade80;
}

/* ===== 关于我 ===== */
.about {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(180deg, var(--bg-card) 0%, var(--primary-dark) 100%);
}

.about-content {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.about-avatar {
    display: flex;
    justify-content: center;
}

.avatar-placeholder {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: rgba(212, 168, 83, 0.1);
    border: 3px solid var(--primary-gold);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.about-info {
    padding: var(--spacing-md) 0;
}

.about-name {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-gold);
    margin-bottom: var(--spacing-xs);
}

.about-title {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
}

.about-bio {
    font-size: 1rem;
    color: var(--text-muted);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
}

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

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-gold);
    line-height: 1;
}

.stat-label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

/* ===== 联系我 ===== */
.contact {
    padding: var(--spacing-xl) 0;
    background: var(--primary-dark);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: var(--spacing-xl);
}

.contact-form-wrapper {
    background: var(--bg-card-light);
    border: 1px solid rgba(212, 168, 83, 0.15);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-size: 0.9rem;
    color: var(--primary-gold);
    font-weight: 600;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: var(--spacing-sm);
    border: 1px solid rgba(212, 168, 83, 0.3);
    border-radius: var(--radius-md);
    background: rgba(10, 22, 40, 0.5);
    color: var(--text-light);
    font-size: 1rem;
    font-family: var(--font-family);
    transition: var(--transition-normal);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-gold);
    box-shadow: 0 0 0 3px rgba(212, 168, 83, 0.2);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group select {
    cursor: pointer;
}

.form-group select option {
    background: var(--primary-dark);
    color: var(--text-light);
}

.contact-qrcode {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.qrcode-placeholder {
    background: var(--bg-card-light);
    border: 3px solid #4ade80;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.qrcode-box {
    width: 200px;
    height: 200px;
    background: rgba(74, 222, 128, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    overflow: hidden;
}

.qrcode-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: var(--radius-md);
}

.qrcode-icon {
    font-size: 3rem;
}

.qrcode-text {
    font-size: 0.9rem;
    color: var(--text-muted);
    text-align: center;
}

.qrcode-wechat {
    font-size: 1.1rem;
    color: var(--primary-gold);
    font-weight: 600;
    text-align: center;
    margin-top: var(--spacing-xs);
}

.qrcode-hint {
    margin-top: var(--spacing-sm);
    font-size: 1rem;
    color: #4ade80;
    font-weight: 600;
}

.contact-tips {
    background: rgba(212, 168, 83, 0.1);
    border: 1px solid rgba(212, 168, 83, 0.2);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.contact-tips h4 {
    font-size: 1rem;
    color: var(--primary-gold);
    margin-bottom: var(--spacing-sm);
}

.contact-tips ul {
    list-style: none;
}

.contact-tips li {
    color: var(--text-muted);
    font-size: 0.9rem;
    padding: 0.5rem 0;
}

.contact-tips li::before {
    content: '•';
    color: var(--primary-gold);
    margin-right: 0.5rem;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--bg-card);
    border-top: 1px solid rgba(212, 168, 83, 0.1);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid rgba(212, 168, 83, 0.1);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.footer-slogan {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: var(--spacing-xs);
}

.footer-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition-normal);
}

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

.footer-social {
    display: flex;
    gap: var(--spacing-sm);
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(212, 168, 83, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    text-decoration: none;
    transition: var(--transition-normal);
}

.social-link:hover {
    background: var(--primary-gold);
    transform: translateY(-3px);
}

.footer-bottom {
    padding-top: var(--spacing-md);
    text-align: center;
}

.copyright {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: var(--spacing-xs);
}

.icp {
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* ===== 回到顶部按钮 ===== */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--primary-gold);
    color: var(--primary-dark);
    border: none;
    cursor: pointer;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-gold);
    will-change: opacity, transform;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(212, 168, 83, 0.5);
}

/* ===== Toast提示 ===== */
.toast {
    position: fixed;
    top: 100px;
    left: 50%;
    transform: translateX(-50%) translateY(-20px);
    background: var(--bg-card);
    border: 2px solid #4ade80;
    border-radius: var(--radius-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    z-index: 2000;
    will-change: transform, opacity;
}

.toast.visible {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.toast-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.toast-icon {
    font-size: 1.5rem;
}

.toast-message {
    color: var(--text-light);
    font-size: 1rem;
}

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

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-20px);
    }
    60% {
        transform: translateX(-50%) translateY(-10px);
    }
}

.fade-in-up {
    opacity: 0;
    animation: fadeInUp 0.6s ease-out forwards;
}

/* 数字跳动动画 */
@keyframes countUp {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .indicators-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tutorials-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(10, 22, 40, 0.95);
        flex-direction: column;
        padding: var(--spacing-md);
        gap: var(--spacing-xs);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .services-grid,
    .indicators-grid,
    .tutorials-grid {
        grid-template-columns: 1fr;
    }
    
    .guarantee-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .pricing-table th:nth-child(3),
    .pricing-table td:nth-child(3),
    .pricing-table th:nth-child(4),
    .pricing-table td:nth-child(4) {
        display: none;
    }
    
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .stat-number {
        font-size: 2rem;
    }
}

/* ===== 性能优化 ===== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}

/* 滚动时暂停动画 */
.pause-animation * {
    animation-play-state: paused !important;
}