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

:root {
    --primary-color: #4F46E5;
    --primary-dark: #4338CA;
    --secondary-color: #06B6D4;
    --text-dark: #1F2937;
    --text-light: #6B7280;
    --bg-light: #F9FAFB;
    --white: #FFFFFF;
    --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    overflow-x: 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: 0 2px 10px rgba(0, 0, 0, 0.05);
    z-index: 1000;
    padding: 1rem 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.nav-brand i {
    font-size: 2rem;
}

.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;
}

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

/* Hero 区域 */
.hero {
    position: relative;
    background: var(--gradient);
    padding: 150px 0 100px;
    color: var(--white);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><circle cx="50" cy="50" r="2" fill="white" opacity="0.1"/></svg>');
    opacity: 0.3;
}

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

.hero-text h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.highlight {
    color: #FDE68A;
}

.hero-description {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    opacity: 0.95;
}

.hero-subtitle {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.85;
}

.download-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 12px 24px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
}

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

.btn span {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.btn small {
    font-size: 0.7rem;
    font-weight: 400;
}

.btn strong {
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: #000;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

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

.btn-secondary:hover {
    background: var(--bg-light);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.app-info {
    display: flex;
    gap: 2rem;
    margin-top: 2rem;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.info-item i {
    font-size: 1.2rem;
    opacity: 0.8;
}

/* 手机模型 */
.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.phone-mockup {
    width: 300px;
    height: 600px;
    background: #1F2937;
    border-radius: 40px;
    padding: 12px;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
    position: relative;
    animation: float 3s ease-in-out infinite;
}

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

.phone-mockup::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 25px;
    background: #1F2937;
    border-radius: 0 0 20px 20px;
    z-index: 2;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 30px;
    overflow: hidden;
    position: relative;
}

.screen-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.screen-content {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    background: linear-gradient(180deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0) 100%);
}

.screen-icon {
    font-size: 8rem;
    color: rgba(255, 255, 255, 0.3);
}

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

/* 特性区域 */
.features {
    padding: 100px 0;
    background: var(--white);
}

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

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 4rem;
}

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

.feature-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: var(--gradient);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: var(--white);
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

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

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

.screenshots-slider {
    display: flex;
    gap: 2rem;
    overflow-x: auto;
    padding: 2rem 0;
    scroll-snap-type: x mandatory;
}

.screenshots-slider::-webkit-scrollbar {
    height: 8px;
}

.screenshots-slider::-webkit-scrollbar-track {
    background: #E5E7EB;
    border-radius: 4px;
}

.screenshots-slider::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

.screenshot-card {
    flex: 0 0 280px;
    scroll-snap-align: start;
    position: relative;
}

.screenshot-img {
    width: 280px;
    height: 560px;
    border-radius: 30px;
    object-fit: cover;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    display: block;
    transition: transform 0.3s ease;
}

.screenshot-img:hover {
    transform: scale(1.05);
}

.screenshot-label {
    text-align: center;
    margin-top: 1rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
}

.screenshot-placeholder {
    width: 280px;
    height: 560px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--white);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.screenshot-placeholder i {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.screenshot-placeholder p {
    font-size: 1.2rem;
    font-weight: 600;
}

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

.download-content h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.download-content p {
    font-size: 1.3rem;
    margin-bottom: 3rem;
    opacity: 0.9;
}

.download-buttons-large {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.btn-download {
    padding: 16px 32px;
    font-size: 1.1rem;
}

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

.btn-ios:hover {
    background: #000;
    transform: translateY(-2px);
}

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

.btn-android:hover {
    background: var(--bg-light);
    transform: translateY(-2px);
}

.qr-codes {
    display: flex;
    justify-content: center;
    gap: 4rem;
}

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

.qr-placeholder {
    width: 150px;
    height: 150px;
    background: var(--white);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

.qr-placeholder i {
    font-size: 4rem;
    color: var(--primary-color);
}

.qr-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.qr-item p {
    font-weight: 600;
}

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

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

.footer-section h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.footer-section h3 i {
    font-size: 1.8rem;
    color: var(--primary-color);
}

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

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 1.5rem;
}

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

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    text-decoration: none;
    transition: all 0.3s;
}

.social-links a:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

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

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

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.3s;
}

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

.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);
}

/* 响应式设计 */
@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-text h1 {
        font-size: 2.5rem;
    }

    .hero-image {
        display: none;
    }

    .download-buttons,
    .download-buttons-large {
        justify-content: center;
    }

    .app-info {
        justify-content: center;
    }

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

    .social-links {
        justify-content: center;
    }

    .nav-menu {
        display: none;
    }
}

@media (max-width: 640px) {
    .hero-text h1 {
        font-size: 2rem;
    }

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

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

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

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

    .qr-codes {
        flex-direction: column;
        align-items: center;
        gap: 2rem;
    }

    .download-buttons,
    .download-buttons-large {
        flex-direction: column;
        align-items: stretch;
    }
}