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

:root {
    --primary-color: #4A90E2;
    --primary-dark: #357ABD;
    --secondary-color: #50C878;
    --text-dark: #2C3E50;
    --text-light: #7F8C8D;
    --bg-light: #F8F9FA;
    --bg-white: #FFFFFF;
    --border-color: #E1E8ED;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.15);
}

html {
    scroll-behavior: smooth;
}

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

body.nav-open {
    overflow: hidden;
}

.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, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

.logo-img {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

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

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

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    transition: all 0.3s ease;
}

.hamburger.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

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

.hamburger.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* Hero区域 */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 150px 0 100px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('../images/hero-pattern.png') repeat;
    opacity: 0.1;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    opacity: 0.9;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    line-height: 1.8;
}

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

.btn {
    padding: 14px 32px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(255, 255, 255, 0.3);
}

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

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

.hero-stats {
    display: flex;
    gap: 3rem;
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.8;
}

.hero-image {
    text-align: center;
}

.phone-mockup {
    max-width: 100%;
    height: auto;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.3));
    animation: float 3s ease-in-out infinite;
}

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

.hero-wave {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
}

.hero-wave svg {
    width: 100%;
    height: auto;
    display: block;
}

/* 功能特点 */
.features {
    padding: 100px 0;
    background: var(--bg-white);
}

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

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

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-light);
}

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

.feature-card {
    background: var(--bg-white);
    padding: 2.5rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    text-align: center;
}

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

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.feature-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.feature-description {
    color: var(--text-light);
    line-height: 1.8;
}

/* 应用截图 */
.screenshots {
    padding: 100px 0;
    background: var(--bg-light);
}

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

.screenshot-item {
    background: var(--bg-white);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.screenshot-item:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

.screenshot-item img {
    width: 100%;
    height: auto;
    display: block;
}

.screenshot-caption {
    padding: 1rem;
    text-align: center;
    font-weight: 500;
    color: var(--text-dark);
}

/* 下载区域 */
.download {
    padding: 100px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

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

.download-title {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
}

.download-description {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.download-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 3rem;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 2rem;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    text-decoration: none;
    color: white;
    transition: all 0.3s ease;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.download-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateX(10px);
}

.download-btn img {
    width: 40px;
    height: 40px;
}

.btn-text {
    display: flex;
    flex-direction: column;
}

.btn-label {
    font-weight: 600;
    font-size: 1.1rem;
}

.btn-subtitle {
    font-size: 0.9rem;
    opacity: 0.8;
}

.qr-code-section {
    display: flex;
    gap: 2rem;
}

.qr-code-item {
    text-align: center;
}

.qr-code {
    width: 150px;
    height: 150px;
    background: white;
    padding: 10px;
    border-radius: 10px;
    margin-bottom: 0.5rem;
}

.qr-code-item p {
    font-size: 0.9rem;
    opacity: 0.9;
}

.download-image {
    text-align: center;
}

.download-image img {
    max-width: 100%;
    height: auto;
}

/* 关于我们 */
.about {
    padding: 100px 0;
    background: var(--bg-white);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
}

.about-text h3 {
    font-size: 1.8rem;
    font-weight: bold;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.about-text h3:not(:first-child) {
    margin-top: 2rem;
}

.about-text p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.advantage-list {
    list-style: none;
    padding-left: 0;
}

.advantage-list li {
    padding: 0.8rem 0;
    padding-left: 2rem;
    position: relative;
    color: var(--text-light);
    line-height: 1.8;
}

.advantage-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
    font-size: 1.2rem;
}

.contact-info {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 15px;
}

.contact-info h3 {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.contact-item {
    margin-bottom: 1rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.contact-label {
    font-weight: 600;
    color: var(--text-dark);
}

.contact-item a {
    color: var(--primary-color);
    text-decoration: none;
}

.contact-item a:hover {
    text-decoration: underline;
}

/* 页脚 */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h4 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

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

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

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.social-links {
    display: flex;
    gap: 1rem;
}

.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: all 0.3s ease;
}

.social-link:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
}

.social-link img {
    width: 24px;
    height: 24px;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
    z-index: 999;
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-5px);
}

.back-to-top svg {
    width: 24px;
    height: 24px;
}

.back-to-top.show {
    display: flex;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .container {
        padding: 0 16px;
    }

    .hero,
    .features,
    .screenshots,
    .download,
    .about {
        padding: 120px 0 80px;
    }

    .hero-content,
    .download-content,
    .about-content {
        gap: 2rem;
    }

    .hero-title {
        font-size: 3rem;
    }

    .download-image img {
        max-width: 80%;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 65px;
        flex-direction: column;
        background: white;
        width: 100%;
        height: calc(100vh - 65px);
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow);
        padding: 1.5rem 0 3rem;
        overflow-y: auto;
        z-index: 999;
    }

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

    .nav-menu li {
        width: 100%;
    }

    .nav-link {
        display: block;
        padding: 0.75rem 0;
        font-size: 1.1rem;
    }

    .hamburger {
        display: flex;
    }

    .nav-wrapper {
        padding: 0.75rem 0;
    }

    .hero-content,
    .download-content,
    .about-content {
        grid-template-columns: 1fr;
    }

    .hero {
        padding: 120px 0 60px;
    }

    .hero-text {
        text-align: center;
    }

    .hero-image {
        order: -1;
        margin-bottom: 2rem;
    }

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

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

    .hero-stats {
        justify-content: space-around;
        flex-wrap: wrap;
        gap: 2rem;
    }

    .section-title {
        font-size: 2rem;
    }

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

    .screenshots-slider {
        grid-template-columns: 1fr;
    }

    .qr-code-section {
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 1rem;
    }

    .download-buttons {
        align-items: stretch;
    }

    .download-image {
        max-width: 280px;
        margin: 0 auto;
    }

    .about-content {
        gap: 2rem;
    }

    .footer-content {
        grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 110px 0 50px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }

    .feature-card {
        padding: 1.8rem;
    }

    .download-title {
        font-size: 2rem;
    }

    .qr-code {
        width: 130px;
        height: 130px;
    }

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