/* ========================================
   全局样式
======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --bg-color: #f8fafc;
    --text-color: #1e293b;
    --white: #ffffff;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
}

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

/* ========================================
   TopBar 导航栏
======================================== */
.topbar {
    background-color: var(--white);
    box-shadow: var(--shadow);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: 70px;
}

.topbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
}

.logo-icon {
    width: 40px;
    height: 40px;
    margin-right: 10px;
    background: linear-gradient(135deg, var(--primary-color), #3b82f6);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-menu a {
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
    padding: 8px 0;
    position: relative;
}

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

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width 0.3s;
}

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

.auth-buttons {
    display: flex;
    gap: 15px;
}

.btn {
    padding: 10px 24px;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    border: none;
    font-size: 14px;
    display: inline-block;
    text-align: center;
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

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

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

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

.btn-large {
    padding: 14px 32px;
    font-size: 16px;
}

/* ========================================
   轮播图区域
======================================== */
.hero-slider {
    margin-top: 70px;
    position: relative;
    height: 500px;
    overflow: hidden;
}

.slider-container {
    display: flex;
    transition: transform 0.5s ease;
    height: 100%;
}

.slide {
    min-width: 100%;
    height: 100%;
    position: relative;
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
}

.slide::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to right, rgba(0,0,0,0.6), rgba(0,0,0,0.3));
}

.slide-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: var(--white);
    max-width: 800px;
    padding: 0 20px;
}

.slide-content h1 {
    font-size: 48px;
    margin-bottom: 20px;
    font-weight: 700;
}

.slide-content p {
    font-size: 20px;
    margin-bottom: 30px;
    opacity: 0.9;
}

.slider-dots {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: rgba(255,255,255,0.5);
    cursor: pointer;
    transition: all 0.3s;
}

.dot.active {
    background-color: var(--white);
    width: 30px;
    border-radius: 6px;
}

.slider-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(255,255,255,0.2);
    border: none;
    color: var(--white);
    font-size: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.slider-btn:hover {
    background-color: rgba(255,255,255,0.4);
}

.slider-btn.prev {
    left: 20px;
}

.slider-btn.next {
    right: 20px;
}

/* ========================================
   产品展示区域
======================================== */
.products-section {
    padding: 80px 0;
    background-color: var(--white);
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 36px;
    color: var(--text-color);
    margin-bottom: 15px;
}

.section-title p {
    color: var(--secondary-color);
    font-size: 18px;
}

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

.product-card {
    background-color: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid var(--border-color);
}

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

.product-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 60px;
}

.product-info {
    padding: 25px;
}

.product-info h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--text-color);
}

.product-info p {
    color: var(--secondary-color);
    margin-bottom: 20px;
    line-height: 1.6;
}

.product-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.product-version {
    font-size: 12px;
    color: var(--secondary-color);
    background-color: var(--bg-color);
    padding: 4px 10px;
    border-radius: 20px;
}

/* ========================================
   底部区域
======================================== */
.footer {
    background-color: #1e293b;
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--white);
}

.footer-section p,
.footer-section a {
    color: #94a3b8;
    line-height: 2;
    display: block;
    transition: color 0.3s;
}

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

.qr-code {
    width: 120px;
    height: 120px;
    background-color: var(--white);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #1e293b;
    font-size: 12px;
    text-align: center;
}

.footer-bottom {
    border-top: 1px solid #334155;
    padding-top: 30px;
    text-align: center;
    color: #64748b;
    font-size: 14px;
}

.footer-bottom a {
    color: #94a3b8;
    margin: 0 10px;
}

/* ========================================
   登录/注册页面样式
======================================== */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 20px;
}

.auth-container {
    background-color: var(--white);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 450px;
    padding: 40px;
}

.auth-header {
    text-align: center;
    margin-bottom: 30px;
}

.auth-header .logo {
    justify-content: center;
    margin-bottom: 20px;
}

.auth-header h2 {
    font-size: 28px;
    color: var(--text-color);
    margin-bottom: 10px;
}

.auth-header p {
    color: var(--secondary-color);
}

.form-group {
    margin-bottom: 20px;
}

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

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 15px;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    font-size: 14px;
}

.remember-me {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--secondary-color);
}

.remember-me input {
    width: 16px;
    height: 16px;
}

.forgot-password {
    color: var(--primary-color);
}

.forgot-password:hover {
    text-decoration: underline;
}

.btn-full {
    width: 100%;
    padding: 14px;
    font-size: 16px;
}

.auth-footer {
    text-align: center;
    margin-top: 25px;
    padding-top: 25px;
    border-top: 1px solid var(--border-color);
    color: var(--secondary-color);
}

.auth-footer a {
    color: var(--primary-color);
    font-weight: 500;
}

.auth-footer a:hover {
    text-decoration: underline;
}

/* ========================================
   关于页面样式
======================================== */
.page-header {
    margin-top: 70px;
    background: linear-gradient(135deg, var(--primary-color), #3b82f6);
    color: var(--white);
    padding: 80px 0;
    text-align: center;
}

.page-header h1 {
    font-size: 42px;
    margin-bottom: 15px;
}

.page-header p {
    font-size: 18px;
    opacity: 0.9;
}

.about-content {
    padding: 80px 0;
}

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

.about-text h2 {
    font-size: 32px;
    margin-bottom: 20px;
    color: var(--text-color);
}

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

.about-image {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    border-radius: 16px;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 80px;
}

/* ========================================
   产品页面样式
======================================== */
.products-page {
    padding: 80px 0;
}

.products-filter {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 10px 24px;
    border: 1px solid var(--border-color);
    background-color: var(--white);
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 14px;
}

.filter-btn:hover,
.filter-btn.active {
    background-color: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

/* ========================================
   响应式设计
======================================== */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .slide-content h1 {
        font-size: 32px;
    }
    
    .slide-content p {
        font-size: 16px;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .qr-code {
        margin: 0 auto;
    }
}