* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4a9b8c;
    --primary-light: #e8f5f2;
    --text-primary: #2d3436;
    --text-secondary: #636e72;
    --bg-primary: #fafbfb;
    --bg-secondary: #f5f7f7;
    --border-color: #e0e0e0;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.6;
    min-height: 100vh;
}

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

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: 1px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 400;
    transition: var(--transition);
    position: relative;
}

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

.nav-links a.download-btn {
    background-color: var(--primary-color);
    color: white;
    padding: 0.5rem 1.2rem;
    border-radius: 8px;
    font-weight: 500;
}

.nav-links a.download-btn:hover {
    background-color: #3d8a7c;
}

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

.menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    margin: 3px 0;
    transition: var(--transition);
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 5%;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #fafbfb 0%, #f0f4f3 50%, #f5f7f7 100%);
}

.hero-content {
    max-width: 800px;
    text-align: center;
    z-index: 1;
}

.version-badge {
    display: inline-block;
    background-color: var(--primary-light);
    color: var(--primary-color);
    padding: 0.3rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 2rem;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.hero-title .highlight {
    color: var(--primary-color);
    position: relative;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 3vw, 1.5rem);
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.hero-description {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto 2.5rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    padding: 0.8rem 2rem;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    display: inline-block;
}

.btn-primary:hover {
    background-color: #3d8a7c;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background-color: white;
    color: var(--text-primary);
    padding: 0.8rem 2rem;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 500;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    display: inline-block;
}

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

.hero-visual {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
    pointer-events: none;
}

.floating-shape {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle, var(--primary-light) 0%, transparent 70%);
    opacity: 0.6;
}

.shape-1 {
    width: 400px;
    height: 400px;
    top: 10%;
    left: -10%;
    animation: float 8s ease-in-out infinite;
}

.shape-2 {
    width: 300px;
    height: 300px;
    top: 50%;
    right: -5%;
    animation: float 10s ease-in-out infinite reverse;
}

.shape-3 {
    width: 200px;
    height: 200px;
    bottom: 10%;
    left: 30%;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(5deg); }
}

.features {
    padding: 8rem 0;
    background-color: #fafbfb;
}

.features .container {
    max-width: 1200px;
}

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

.features-header h2 {
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.features-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.feature-showcase {
    display: flex;
    flex-direction: column;
    gap: 5rem;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 6rem;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
    padding: 2rem;
    border-radius: 16px;
    background-color: white;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.04);
}

.feature-item.visible {
    opacity: 1;
    transform: translateY(0);
}

.feature-item-left {
    flex-direction: row;
}

.feature-item-right {
    flex-direction: row;
    justify-content: flex-end;
}

.feature-item-right .feature-content {
    text-align: right;
}

.feature-item-right .feature-content .feature-icon {
    margin-left: auto;
    margin-right: 0;
}

.feature-item-center {
    justify-content: center;
    text-align: center;
}

.feature-content {
    flex: 1;
    max-width: 500px;
}

.feature-icon {
    width: 70px;
    height: 70px;
    margin-bottom: 1.5rem;
    background-color: var(--primary-light);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 1.8rem;
    transition: var(--transition);
}

.feature-item-center .feature-icon {
    margin-left: auto;
    margin-right: auto;
}

.feature-content:hover .feature-icon {
    transform: scale(1.1);
}

.feature-icon svg {
    width: 32px;
    height: 32px;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1.2rem;
}

.feature-description {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.feature-image-wrapper {
    flex: 0 0 auto;
    width: 220px;
    position: relative;
}

.feature-image {
    width: 100%;
    height: auto;
    max-height: 480px;
    object-fit: cover;
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.08);
    transition: var(--transition);
}

.feature-image-wrapper:hover .feature-image {
    transform: scale(1.02);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
}

.phone-frame {
    position: absolute;
    top: -5px;
    left: -5px;
    right: -5px;
    bottom: -5px;
    border: 2px solid #e0e0e0;
    border-radius: 24px;
    pointer-events: none;
}

.phone-frame::before {
    content: '';
    position: absolute;
    top: 5px;
    left: 50%;
    transform: translateX(-50%);
    width: 45px;
    height: 14px;
    background-color: #1a1a1a;
    border-radius: 0 0 8px 8px;
}

.about {
    padding: 8rem 0;
    background: linear-gradient(135deg, #f5f7f7 0%, #fafbfb 100%);
}

.about .container {
    max-width: 800px;
    text-align: center;
}

.about h2 {
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.about p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 3rem;
}

.stats {
    display: flex;
    justify-content: center;
    gap: 4rem;
    flex-wrap: wrap;
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.developer {
    padding: 8rem 0;
    background-color: white;
}

.developer .container {
    max-width: 800px;
}

.developer-card {
    display: flex;
    align-items: center;
    gap: 2rem;
    background: linear-gradient(135deg, var(--bg-primary) 0%, white 100%);
    padding: 2.5rem;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.developer-card:hover {
    box-shadow: var(--shadow);
}

.developer-avatar {
    width: 80px;
    height: 80px;
    background-color: var(--primary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    flex-shrink: 0;
}

.developer-avatar svg {
    width: 40px;
    height: 40px;
}

.developer-content {
    flex: 1;
}

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

.developer-content p {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 0.8rem;
}

.developer-content p:last-of-type {
    margin-bottom: 1.5rem;
}

.developer-content strong {
    color: var(--primary-color);
}

.developer-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--primary-color);
    color: white;
    padding: 0.7rem 1.5rem;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.developer-link:hover {
    background-color: #3d8a7c;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.developer-link svg {
    width: 18px;
    height: 18px;
}

.footer {
    padding: 1.5rem 0;
    background-color: white;
    border-top: 1px solid var(--border-color);
}

.footer .container {
    text-align: center;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.footer-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.85rem;
    transition: var(--transition);
}

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

.footer-links span {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.footer-divider {
    color: #d0d0d0;
    margin: 0 0.5rem;
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .menu-toggle {
        display: flex;
    }

    .hero {
        min-height: auto;
        padding: 2.5rem 5% 4rem;
    }

    .hero-content {
        padding-top: 4rem;
    }

    .version-badge {
        margin-bottom: 1.25rem;
    }

    .hero-title {
        font-size: 2.2rem;
        margin-bottom: 1rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: 0.8rem;
    }

    .btn-primary, .btn-secondary {
        width: 100%;
        max-width: 250px;
        text-align: center;
        padding: 0.875rem 1.25rem;
    }

    .features {
        padding: 4rem 0;
    }

    .features-header {
        margin-bottom: 2.5rem;
    }

    .features-header h2 {
        font-size: 1.8rem;
    }

    .feature-showcase {
        gap: 2.5rem;
    }

    .feature-item,
    .feature-item-left,
    .feature-item-right {
        flex-direction: column !important;
        text-align: center;
        padding: 1.5rem;
        gap: 0;
    }

    .feature-item-left .feature-image-wrapper,
    .feature-item-right .feature-image-wrapper {
        order: 1;
    }

    .feature-image-wrapper {
        width: 100%;
        max-width: 240px;
        margin-top: 1.25rem;
    }

    .feature-content {
        margin-top: 0;
    }

    .feature-content .feature-icon {
        margin-left: auto;
        margin-right: auto;
        width: 55px;
        height: 55px;
    }

    .feature-item-right .feature-content {
        text-align: center;
    }

    .feature-item-right .feature-content .feature-icon {
        margin-left: auto;
        margin-right: auto;
    }

    .feature-title {
        font-size: 1.25rem;
        margin-bottom: 0.8rem;
    }

    .feature-description {
        font-size: 0.9rem;
        line-height: 1.6;
    }

    .about {
        padding: 4rem 0;
    }

    .about h2 {
        font-size: 1.8rem;
    }

    .about p {
        font-size: 1rem;
        margin-bottom: 2rem;
    }

    .stats {
        gap: 1.5rem;
    }

    .stat-number {
        font-size: 2rem;
    }

    .developer {
        padding: 3rem 0;
    }

    .developer-card {
        padding: 1.5rem;
        gap: 1rem;
    }

    .developer-content h3 {
        font-size: 1.15rem;
    }

    .developer-content p {
        font-size: 0.9rem;
        line-height: 1.6;
    }

    .footer-content {
        flex-direction: column;
    }

    .developer-card {
        flex-direction: column;
        text-align: center;
        padding: 1.5rem;
    }

    .developer-content h3 {
        font-size: 1.25rem;
    }
}

.responsive-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: white;
    padding: 1rem;
    box-shadow: var(--shadow);
}

.responsive-nav.show {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.responsive-nav a {
    text-decoration: none;
    color: var(--text-secondary);
    padding: 0.5rem;
    border-radius: 8px;
    transition: var(--transition);
}

.responsive-nav a:hover {
    background-color: var(--primary-light);
    color: var(--primary-color);
}

.responsive-nav a.download-btn {
    background-color: var(--primary-color);
    color: white;
    text-align: center;
}