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

:root {
    --primary-color: #667eea;
    --primary-dark: #5a6fd8;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-light: #999999;
    --background-light: #ffffff;
    --background-gray: #f8f9fa;
    --background-dark: #333333;
    --border-color: #e1e5e9;
    --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 8px 30px rgba(0, 0, 0, 0.2);
    --border-radius: 12px;
    --border-radius-large: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-light);
    overflow-x: hidden;
}

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

/* 导航栏 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    z-index: 1000;
    transition: var(--transition);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    min-height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.logo img {
    width: 40px;
    height: 40px;
    margin-right: 12px;
    border-radius: 8px;
    object-fit: cover;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.language-switch {
    background: none;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    padding: 0.5rem 1.2rem;
    border-radius: 25px;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--transition);
}

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: var(--transition);
    border-radius: 2px;
}

/* 英雄区域 */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(120, 119, 198, 0.2) 0%, transparent 50%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-content {
    animation: fadeInUp 1s ease-out;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #ffffff 0%, rgba(255, 255, 255, 0.8) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    opacity: 0.9;
    font-weight: 300;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
    opacity: 0.8;
    line-height: 1.8;
    max-width: 500px;
}

.hero-actions {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 2rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.btn-primary:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

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

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

.btn img {
    height: 50px;
    width: auto;
}

/* 手机模型 */
.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeInRight 1s ease-out 0.3s both;
}

.phone-mockup {
    width: 280px;
    height: 560px;
    background: #1a1a1a;
    border-radius: 40px;
    padding: 20px;
    box-shadow: 
        0 0 0 8px rgba(255, 255, 255, 0.1),
        0 20px 60px rgba(0, 0, 0, 0.3);
    position: relative;
    transform: perspective(1000px) rotateY(-15deg) rotateX(5deg);
    transition: var(--transition);
}

.phone-mockup:hover {
    transform: perspective(1000px) rotateY(-10deg) rotateX(2deg);
}

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

.app-preview {
    padding: 20px;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: white;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 30px;
}

.preview-content h3 {
    color: white;
    font-size: 1.2rem;
    margin-bottom: 20px;
    font-weight: 600;
}

.habit-item {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.1);
    padding: 12px 16px;
    border-radius: 12px;
    margin-bottom: 12px;
    backdrop-filter: blur(10px);
}

.habit-item.completed {
    background: rgba(76, 175, 80, 0.2);
}

.habit-icon {
    font-size: 1.2rem;
    margin-right: 12px;
}

.habit-name {
    flex: 1;
    color: white;
    font-weight: 500;
}

.habit-status {
    color: white;
    font-size: 1.1rem;
    font-weight: 600;
}

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

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

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

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

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

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2.5rem;
}

.feature-card {
    background: var(--background-light);
    padding: 2.5rem;
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-light);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transform: scaleX(0);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-heavy);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    display: block;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 1rem;
}

/* 订阅方案区域 */
.pricing {
    padding: 100px 0;
    background: var(--background-gray);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 3rem;
    max-width: 900px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--background-light);
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-medium);
    overflow: hidden;
    position: relative;
    transition: var(--transition);
    border: 2px solid transparent;
}

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

.pricing-card.featured {
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-5px);
}

.popular-badge {
    position: absolute;
    top: -1px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-color);
    color: white;
    padding: 0.5rem 2rem;
    border-radius: 0 0 20px 20px;
    font-weight: 600;
    font-size: 0.9rem;
    z-index: 10;
}

.pricing-header {
    padding: 2.5rem 2rem 1.5rem;
    text-align: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
}

.pricing-card.featured .pricing-header {
    padding-top: 3.5rem;
}

.pricing-header h3 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    margin-bottom: 0.5rem;
}

.currency {
    font-size: 1.5rem;
    font-weight: 600;
}

.amount {
    font-size: 3.5rem;
    font-weight: 800;
    margin: 0 0.2rem;
}

.period {
    font-size: 1.1rem;
    opacity: 0.8;
}

.price-note {
    font-size: 0.9rem;
    opacity: 0.8;
    margin-top: 0.5rem;
}

.features-list {
    list-style: none;
    padding: 2rem;
}

.features-list li {
    padding: 0.75rem 0;
    display: flex;
    align-items: center;
    font-size: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.features-list li:last-child {
    border-bottom: none;
}

.features-list li::before {
    content: '✓';
    color: #4caf50;
    font-weight: bold;
    font-size: 1.2rem;
    margin-right: 0.75rem;
    width: 20px;
    text-align: center;
}

.features-list li.excluded {
    opacity: 0.5;
}

.features-list li.excluded::before {
    content: '✗';
    color: #f44336;
}

.pricing-card .btn {
    margin: 0 2rem 2rem;
    width: calc(100% - 4rem);
    justify-content: center;
}

.pricing-card .btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border: none;
    font-weight: 600;
}

.pricing-card .btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary-color) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.pricing-card .btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    font-weight: 600;
}

.pricing-card .btn-outline:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.cancel-note {
    text-align: center;
    font-size: 1rem;
    color: #333333;
    margin: 1rem 2rem 2rem;
    font-weight: 500;
    opacity: 0.8;
    display: block;
    line-height: 1.4;
}

/* 页脚 */
.footer {
    background: var(--background-dark);
    color: white;
    padding: 4rem 0 2rem;
}

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

.footer-logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.footer-logo img {
    width: 40px;
    height: 40px;
    margin-right: 12px;
    border-radius: 8px;
}

.footer-description {
    color: #ccc;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.footer-section h4 {
    color: var(--primary-color);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer-links {
    list-style: none;
}

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

.footer-links a {
    color: #ccc;
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.95rem;
}

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

.footer-bottom {
    border-top: 1px solid #555;
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #999;
}

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

.footer-social a {
    color: #999;
    text-decoration: none;
    font-size: 1.2rem;
    transition: var(--transition);
}

.footer-social a:hover {
    color: var(--primary-color);
    transform: translateY(-2px);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

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

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

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

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

    .phone-mockup {
        width: 240px;
        height: 480px;
        transform: none;
    }

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

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

    .pricing-card.featured {
        transform: none;
    }

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

    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

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

    .container {
        padding: 0 15px;
    }
}