/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4A90E2;
    --white: #FFFFFF;
    --text-dark: #1A1A1A;
    --text-gray: #666666;
    --text-light: #999999;
    --bg-light: #F8F9FA;
    --border-color: #E0E0E0;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 20px rgba(74, 144, 226, 0.2);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Roboto", "Helvetica Neue", Arial, sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    background-color: var(--white);
}

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

/* Header */
.header {
    background-color: var(--white);
    border-bottom: 1px solid var(--border-color);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
}

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

.logo {
    font-size: 24px;
    font-weight: 600;
    color: var(--primary-color);
    letter-spacing: 1px;
}

.nav {
    display: flex;
    gap: 30px;
}

.nav-link {
    color: var(--text-dark);
    text-decoration: none;
    font-size: 16px;
    transition: color 0.3s ease;
    position: relative;
}

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

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

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

/* Hero Section */
.hero {
    padding: 100px 0 80px;
    text-align: center;
    background: linear-gradient(180deg, var(--white) 0%, var(--bg-light) 100%);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 20px;
    line-height: 1.2;
    letter-spacing: -0.5px;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-gray);
    margin-bottom: 40px;
    font-weight: 400;
}

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

.btn {
    display: inline-block;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 500;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    font-family: inherit;
}

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

.btn-primary:hover {
    background-color: #357ABD;
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

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

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

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

.phone-mockup {
    width: 300px;
    height: 600px;
    margin: 0 auto;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 30px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow: hidden;
}

.phone-mockup::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 6px;
    background-color: rgba(255, 255, 255, 0.3);
    border-radius: 3px;
}

/* Features Section */
.features {
    padding: 100px 0;
    background-color: var(--white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.feature-card {
    text-align: center;
    padding: 40px 30px;
    border-radius: 16px;
    background-color: var(--white);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

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

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.feature-description {
    font-size: 16px;
    color: var(--text-gray);
    line-height: 1.6;
}

/* Features Detail Section */
.features-detail {
    padding: 100px 0;
    background-color: var(--bg-light);
}

.feature-detail-item {
    display: flex;
    align-items: center;
    gap: 60px;
    margin-bottom: 100px;
}

.feature-detail-item:last-child {
    margin-bottom: 0;
}

.feature-detail-item.reverse {
    flex-direction: row-reverse;
}

.feature-detail-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.feature-detail-placeholder {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 120px;
    box-shadow: var(--shadow);
}

.feature-detail-content {
    flex: 1;
}

.feature-detail-title {
    font-size: 36px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 20px;
}

.feature-detail-text {
    font-size: 18px;
    color: var(--text-gray);
    line-height: 1.8;
}

/* Contact Section */
.contact-section {
    padding: 80px 0;
    background-color: var(--white);
    border-top: 1px solid var(--border-color);
}

.contact-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.contact-title {
    font-size: 32px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 40px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-item {
    font-size: 16px;
    color: var(--text-gray);
    line-height: 1.8;
}

.contact-item strong {
    color: var(--text-dark);
    margin-right: 10px;
}

.contact-value {
    color: var(--text-gray);
}

.contact-link {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.contact-link:hover {
    color: #357ABD;
    text-decoration: underline;
}

/* Privacy Section */
.privacy-section {
    padding: 80px 0 100px;
    background-color: var(--bg-light);
    min-height: calc(100vh - 200px);
}

.privacy-content {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--white);
    padding: 60px 50px;
    border-radius: 16px;
    box-shadow: var(--shadow);
}

.privacy-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 20px;
    text-align: center;
}

.privacy-date {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 40px;
    text-align: center;
}

.privacy-text {
    color: var(--text-dark);
    line-height: 1.8;
}

.privacy-text h2 {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-dark);
    margin-top: 40px;
    margin-bottom: 16px;
}

.privacy-text p {
    font-size: 16px;
    color: var(--text-gray);
    margin-bottom: 20px;
}

.privacy-back {
    text-align: center;
    margin-top: 50px;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
}

/* Footer */
.footer {
    background-color: var(--text-dark);
    color: var(--white);
    padding: 40px 0;
    text-align: center;
}

.copyright {
    font-size: 14px;
    margin-bottom: 12px;
    color: #999;
}

.beian-row {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.beian-row a {
    font-size: 12px;
    color: #999;
    text-decoration: none;
    transition: color 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.beian-row a:hover {
    color: #fff;
}

.gongan-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.gongan-icon {
    width: 20px;
    height: 20px;
    vertical-align: middle;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

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

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

    .phone-mockup {
        width: 240px;
        height: 480px;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .features {
        padding: 60px 0;
    }

    .features-detail {
        padding: 60px 0;
    }

    .feature-detail-item {
        flex-direction: column !important;
        gap: 40px;
        margin-bottom: 60px;
    }

    .feature-detail-placeholder {
        width: 200px;
        height: 200px;
        font-size: 80px;
    }

    .feature-detail-title {
        font-size: 28px;
        text-align: center;
    }

    .feature-detail-text {
        font-size: 16px;
        text-align: center;
    }

    .contact-section {
        padding: 60px 0;
    }

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

    .contact-info {
        text-align: left;
        padding: 0 20px;
    }

    .privacy-content {
        padding: 40px 30px;
        margin: 0 20px;
    }

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

    .nav {
        gap: 20px;
    }

    .logo {
        font-size: 20px;
    }

}

@media (max-width: 480px) {
    .hero {
        padding: 60px 0 50px;
    }

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

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

    .phone-mockup {
        width: 200px;
        height: 400px;
    }

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

    .privacy-content {
        padding: 30px 20px;
    }
}

@media (max-width: 600px) {
    .beian-row {
        flex-direction: column;
        gap: 8px;
    }
}