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

:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --text-dark: #1a202c;
    --text-light: #718096;
    --bg-light: #f7fafc;
    --bg-dark: #0a0e27;
    --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

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, 0.1);
    z-index: 1000;
    padding: 15px 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
}

.logo-icon {
    font-size: 28px;
    animation: sparkle 2s ease-in-out infinite;
}

@keyframes sparkle {
    0%, 100% { transform: scale(1) rotate(0deg); }
    50% { transform: scale(1.1) rotate(180deg); }
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.language-switcher {
    display: flex;
    gap: 5px;
    background: var(--bg-light);
    padding: 5px;
    border-radius: 20px;
}

.lang-btn {
    padding: 6px 12px;
    border: none;
    background: transparent;
    color: var(--text-light);
    cursor: pointer;
    border-radius: 15px;
    font-size: 14px;
    transition: all 0.3s ease;
}

.lang-btn:hover {
    background: rgba(102, 126, 234, 0.1);
    color: var(--primary-color);
}

.lang-btn.active {
    background: var(--gradient-1);
    color: white;
}

.btn-download {
    padding: 10px 24px;
    background: var(--gradient-1);
    color: white;
    text-decoration: none;
    border-radius: 25px;
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

/* 英雄区域 */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #0a0e27 0%, #1a1f3a 100%);
    color: white;
    overflow: hidden;
    padding-top: 80px;
}

.stars {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(2px 2px at 20px 30px, white, transparent),
        radial-gradient(2px 2px at 60px 70px, white, transparent),
        radial-gradient(1px 1px at 50px 50px, white, transparent),
        radial-gradient(1px 1px at 130px 80px, white, transparent),
        radial-gradient(2px 2px at 90px 10px, white, transparent);
    background-size: 200px 200px;
    animation: twinkle 5s ease-in-out infinite;
    opacity: 0.5;
}

@keyframes twinkle {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 60px 0;
}

.hero-title {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #fff 0%, #a8b8ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 60px;
}

.btn {
    padding: 14px 32px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s ease;
    display: inline-block;
}

.btn-primary {
    background: var(--gradient-1);
    color: white;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
}

.hero-image {
    margin-top: 40px;
}

.phone-mockup {
    width: 300px;
    height: 600px;
    margin: 0 auto;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.2) 0%, rgba(118, 75, 162, 0.2) 100%);
    border-radius: 40px;
    padding: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
}

.energy-ring {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: conic-gradient(
        from 0deg,
        #ff0000,
        #ff7f00,
        #ffff00,
        #00ff00,
        #0000ff,
        #4b0082,
        #9400d3,
        #ff0000
    );
    animation: rotate 4s linear infinite;
    box-shadow: 0 0 40px rgba(102, 126, 234, 0.6);
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* 特色功能 */
.features {
    padding: 100px 0;
    background: var(--bg-light);
}

.section-title {
    font-size: 42px;
    font-weight: 800;
    text-align: center;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.section-subtitle {
    font-size: 18px;
    text-align: center;
    color: var(--text-light);
    margin-bottom: 60px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.feature-card {
    background: white;
    padding: 40px 30px;
    border-radius: 20px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    font-size: 60px;
    margin-bottom: 20px;
}

.feature-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.feature-desc {
    font-size: 16px;
    color: var(--text-light);
    line-height: 1.8;
}

/* 工作原理 */
.how-it-works {
    padding: 100px 0;
    background: white;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.step {
    text-align: center;
    position: relative;
}

.step-number {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    background: var(--gradient-1);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    font-weight: 800;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
}

.step-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.step-desc {
    font-size: 16px;
    color: var(--text-light);
    line-height: 1.8;
}

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

.download .section-title,
.download .section-subtitle {
    color: white;
}

.btn-appstore {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 16px 40px;
    background: white;
    color: var(--primary-color);
    text-decoration: none;
    border-radius: 30px;
    font-weight: 700;
    font-size: 18px;
    margin-top: 30px;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.btn-appstore:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.download-note {
    margin-top: 20px;
    font-size: 14px;
    opacity: 0.9;
}

/* 页脚 */
.footer {
    background: var(--bg-dark);
    color: rgba(255, 255, 255, 0.8);
    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;
    font-weight: 700;
    margin-bottom: 20px;
    color: white;
}

.footer-section p {
    font-size: 14px;
    line-height: 1.8;
    opacity: 0.8;
}

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

.footer-section ul li {
    margin-bottom: 12px;
}

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

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

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 14px;
    opacity: 0.7;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero-title {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
    }

    .phone-mockup {
        width: 250px;
        height: 500px;
    }

    .energy-ring {
        width: 150px;
        height: 150px;
    }

    .section-title {
        font-size: 32px;
    }

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

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

    .nav-content {
        flex-direction: column;
        gap: 15px;
    }

    .nav-right {
        flex-direction: column;
        width: 100%;
    }

    .language-switcher {
        width: 100%;
        justify-content: center;
    }

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

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

@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }

    .section-title {
        font-size: 28px;
    }

    .feature-card {
        padding: 30px 20px;
    }

    .logo-text {
        font-size: 16px;
    }
}