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

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #f59e0b;
    --accent-color: #10b981;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --text-muted: #9ca3af;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-light: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-light);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-logo i {
    font-size: 1.5rem;
}

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

.nav-menu a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -0.25rem;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width 0.3s ease;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 0.25rem;
}

.nav-toggle span {
    width: 1.5rem;
    height: 2px;
    background: var(--text-dark);
    transition: all 0.3s ease;
}

/* 英雄区域 */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 6rem 0 4rem;
    overflow: hidden;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-content {
    z-index: 2;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 2.5rem;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    border-radius: 0.75rem;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

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

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

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

.hero-stats {
    display: flex;
    gap: 2rem;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-light);
}

.hero-visual {
    z-index: 2;
}

.hero-card {
    background: white;
    border-radius: 1rem;
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    transform: perspective(1000px) rotateY(-5deg) rotateX(5deg);
    transition: transform 0.3s ease;
}

.hero-card:hover {
    transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
}

.card-header {
    background: var(--gradient-primary);
    color: white;
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.card-dots {
    display: flex;
    gap: 0.25rem;
}

.card-dots span {
    width: 0.75rem;
    height: 0.75rem;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
}

.card-title {
    font-weight: 600;
}

.card-content {
    padding: 2rem;
}

.demo-interface {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.demo-step {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-light);
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

.demo-step:hover {
    background: var(--primary-color);
    color: white;
}

.demo-step i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.demo-step:hover i {
    color: white;
}

.demo-arrow {
    text-align: center;
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: bold;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
}

.bg-gradient {
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 200%;
    background: var(--gradient-accent);
    opacity: 0.1;
    transform: rotate(45deg);
}

.bg-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: radial-gradient(circle at 2px 2px, rgba(99, 102, 241, 0.1) 1px, transparent 0);
    background-size: 50px 50px;
}

/* 功能特色 */
.features {
    padding: 6rem 0;
    background: var(--bg-light);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    text-align: center;
}

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

.feature-icon {
    width: 4rem;
    height: 4rem;
    background: var(--gradient-primary);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 1.5rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

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

/* 下载区域 */
.download {
    padding: 6rem 0;
    background: white;
}

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

.download-info h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.download-info p {
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: 2rem;
}

.version-info {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.version-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-light);
}

.version-item i {
    color: var(--primary-color);
    width: 1.25rem;
}

.download-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    border-radius: 1rem;
    text-decoration: none;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

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

.download-btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.download-btn.secondary {
    background: white;
    color: var(--text-dark);
    border-color: var(--border-light);
    box-shadow: var(--shadow-md);
}

.download-btn.secondary:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.download-btn i {
    font-size: 2rem;
    opacity: 0.8;
}

.btn-content {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.btn-title {
    font-weight: 600;
    font-size: 1.125rem;
}

.btn-subtitle {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* 用户好评 */
.testimonials {
    padding: 6rem 0;
    background: white;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.testimonial-card {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.testimonial-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

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

.testimonial-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.user-avatar {
    width: 3rem;
    height: 3rem;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.user-info {
    flex: 1;
}

.user-info h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.25rem;
}

.user-info span {
    color: var(--text-light);
    font-size: 0.875rem;
}

.rating {
    display: flex;
    gap: 0.25rem;
}

.rating i {
    color: #fbbf24;
    font-size: 1rem;
}

.testimonial-content {
    position: relative;
}

.quote-icon {
    position: absolute;
    top: -0.5rem;
    left: -0.5rem;
    font-size: 2rem;
    color: var(--primary-color);
    opacity: 0.3;
}

.testimonial-content p {
    color: var(--text-light);
    line-height: 1.6;
    font-style: italic;
    padding-left: 1.5rem;
}

/* 支持区域 */
.support {
    padding: 6rem 0;
    background: var(--bg-light);
}

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

.support-card {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all 0.3s ease;
}

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

.support-icon {
    width: 4rem;
    height: 4rem;
    background: var(--gradient-secondary);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 1.5rem;
}

.support-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.support-card p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

.support-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.group-number {
    font-family: monospace;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--primary-color);
    background: var(--bg-light);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
}

.btn-join {
    background: #4AB7F7;
    color: white;
    text-decoration: none;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-join:hover {
    background: #3A9DE8;
    transform: translateY(-1px);
}

.btn-join i {
    font-size: 1.125rem;
}

.btn-copy {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.875rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-copy:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.support-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    padding: 0.5rem 1.5rem;
    border: 2px solid var(--primary-color);
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

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

/* 联系我们 */
.contact {
    padding: 6rem 0;
    background: white;
}

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

.contact-info h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.contact-info p {
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: 2rem;
}

.contact-items {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--text-light);
}

.contact-item i {
    color: var(--primary-color);
    width: 1.25rem;
}

.contact-form {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 1rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.875rem;
    border: 2px solid var(--border-light);
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: border-color 0.3s ease;
    background: white;
}

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

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* 页脚 */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-logo i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.footer-info p {
    color: #9ca3af;
    line-height: 1.6;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-column h4 {
    font-weight: 600;
    margin-bottom: 1rem;
    color: white;
}

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

.footer-column li {
    margin-bottom: 0.5rem;
}

.footer-column a {
    color: #9ca3af;
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    border-top: 1px solid #374151;
    padding-top: 1rem;
    text-align: center;
    color: #9ca3af;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-bottom a {
    color: var(--primary-color);
    text-decoration: none;
}

/* 页脚联系信息 */
.footer-contact {
    margin-top: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-contact .contact-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: #9ca3af;
    font-size: 0.875rem;
}

.footer-contact .contact-item i {
    color: var(--primary-color);
    width: 1rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: white;
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding-top: 2rem;
        transition: left 0.3s ease;
        box-shadow: var(--shadow-lg);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-container {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }

    .hero-stats {
        justify-content: center;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .download-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-links {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 0.5rem;
    }

    .testimonials-grid {
        grid-template-columns: 1fr;
    }

    .testimonial-header {
        flex-direction: column;
        text-align: center;
        gap: 0.75rem;
    }

    .support-info {
        gap: 0.75rem;
    }

    .btn-join {
        padding: 0.625rem 1.25rem;
        font-size: 0.875rem;
    }

    .footer-contact {
        gap: 0.5rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .download-info h2 {
        font-size: 2rem;
    }

    .contact-info h2 {
        font-size: 2rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1rem;
    }

    .support-grid {
        grid-template-columns: 1fr;
    }

    .testimonial-card {
        padding: 1.5rem;
    }

    .user-avatar {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1rem;
    }

    .testimonial-content p {
        padding-left: 1rem;
        font-size: 0.875rem;
    }

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

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

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

.animate-on-scroll {
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
}

.animate-on-scroll.from-left {
    animation: fadeInLeft 0.6s ease forwards;
}

.animate-on-scroll.from-right {
    animation: fadeInRight 0.6s ease forwards;
}

/* 加载动画 */
.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% {
        left: -100%;
    }
    100% {
        left: 100%;
    }
}