:root {
    --primary-color: #43b8fe;
    --primary-dark: #2a8fd6;
    --primary-light: #67c6fe;
    --secondary-color: #f5f7fa;
    --text-primary: #1a1a2e;
    --text-secondary: #666666;
    --text-light: #999999;
    --border-color: #e8e8e8;
    --white: #ffffff;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 8px 25px rgba(0, 0, 0, 0.12);
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 70px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

::selection {
    background-color: var(--primary-color);
    color: var(--white);
}

img {
    max-width: 100%;
    height: auto;
}

button, a {
    cursor: pointer;
    outline: none;
    border: none;
    background: none;
    text-decoration: none;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    font-size: 14px;
    font-weight: 500;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    outline: none;
    text-decoration: none;
}

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

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

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

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

.btn-lg {
    padding: 14px 32px;
    font-size: 16px;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid transparent;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-icon {
    width: 24px;
    height: 24px;
    color: var(--primary-color);
    font-weight: bold;
    flex-shrink: 0;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 14px;
    cursor: pointer;
    transition: color 0.3s ease;
    padding: 8px 16px;
    border-radius: 8px;
}

.nav-btn:hover {
    color: var(--primary-color);
    background-color: rgba(67, 184, 254, 0.1);
}

.nav-buttons {
    display: flex;
    gap: 12px;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-btn span {
    width: 25px;
    height: 2px;
    background-color: var(--text-primary);
    transition: all 0.3s ease;
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #f0f8ff 0%, #e8f4fd 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(67, 184, 254, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(67, 184, 254, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content h1 {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.hero-content p:first-of-type {
    font-size: 20px;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 16px;
}

.hero-desc {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
}

.hero-stats {
    display: flex;
    gap: 48px;
}

.stat {
    text-align: left;
}

.stat-number {
    display: block;
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 14px;
    color: var(--text-light);
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-img-container {
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-hover);
}

.hero-img {
    width: 100%;
    max-width: 500px;
    height: auto;
    display: block;
    border-radius: 16px;
}

.hero-img-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(67, 184, 254, 0.1) 0%, rgba(42, 143, 214, 0.1) 100%);
    pointer-events: none;
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-header h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.section-header p {
    font-size: 16px;
    color: var(--text-secondary);
}

.features {
    padding: 80px 0;
    background-color: var(--white);
    position: relative;
}

.features::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: radial-gradient(circle at 1px 1px, rgba(67, 184, 254, 0.03) 1px, transparent 0);
    background-size: 40px 40px;
    pointer-events: none;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background-color: var(--white);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

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

.feature-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 16px;
    color: var(--primary-color);
}

.feature-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.download {
    padding: 80px 0;
    background-color: var(--secondary-color);
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.download-card {
    background-color: var(--white);
    border-radius: 16px;
    padding: 24px;
    text-align: center;
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

.download-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-color);
}

.download-img-container {
    width: 100%;
    height: 140px;
    overflow: hidden;
    border-radius: 12px;
    margin-bottom: 16px;
    background-color: var(--secondary-color);
}

.download-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

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

.download-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.download-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 20px;
}

.download-btn {
    text-decoration: none;
}

.testimonials {
    padding: 80px 0;
    background-color: var(--secondary-color);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.testimonial-card {
    background-color: var(--secondary-color);
    border-radius: 16px;
    padding: 32px;
    transition: all 0.3s ease;
}

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

.stars {
    font-size: 20px;
    color: #ffc107;
    margin-bottom: 16px;
}

.testimonial-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
}

.author {
    display: flex;
    align-items: center;
    gap: 12px;
}

.avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--white);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.author-name {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.author-title {
    font-size: 12px;
    color: var(--text-light);
}

.contact {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.contact-info {
    text-align: left;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 16px;
    color: var(--white);
}

.contact-icon {
    width: 48px;
    height: 48px;
    padding: 12px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: var(--white);
    flex-shrink: 0;
}

.contact-icon-sm {
    width: 16px;
    height: 16px;
    color: currentColor;
    vertical-align: middle;
    margin-right: 8px;
}

.contact-item div {
    display: flex;
    flex-direction: column;
}

.contact-label {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 4px;
}

.contact-value {
    font-size: 18px;
    font-weight: 600;
    color: var(--white);
}

.contact-qrcode {
    display: flex;
    justify-content: center;
}

.qrcode-container {
    background-color: var(--white);
    border-radius: 16px;
    padding: 24px;
    text-align: center;
}

.qrcode-container img {
    width: 180px;
    height: 180px;
    border-radius: 8px;
    margin-bottom: 12px;
}

.qrcode-container p {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.mobile-bottom-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--white);
    border-top: 1px solid var(--border-color);
    padding: 8px 0;
    z-index: 1000;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
}

.mobile-bottom-nav .nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px 0;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.mobile-bottom-nav .nav-item:hover,
.mobile-bottom-nav .nav-item:active {
    color: var(--primary-color);
}

.mobile-bottom-nav .nav-icon {
    width: 24px;
    height: 24px;
    margin-bottom: 4px;
    color: currentColor;
}

.mobile-bottom-nav .nav-text {
    font-size: 12px;
}

.footer {
    padding: 48px 0;
    background-color: var(--text-primary);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 48px;
    margin-bottom: 32px;
}

.footer-info {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer .logo-text {
    color: var(--white);
    font-size: 20px;
    font-weight: 700;
}

.footer-desc {
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
    line-height: 1.6;
}

.footer-contact {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-contact .contact-item {
    color: rgba(255, 255, 255, 0.8);
    font-size: 14px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.link-group h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 16px;
}

.link-group ul {
    list-style: none;
}

.link-group li {
    margin-bottom: 10px;
}

.link-group a {
    text-decoration: none;
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 24px;
}

.footer-bottom p {
    text-align: center;
    color: rgba(255, 255, 255, 0.4);
    font-size: 14px;
}

@media (max-width: 992px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }

    .hero-content h1 {
        font-size: 36px;
    }

    .hero-stats {
        justify-content: center;
    }

    .features-grid,
    .pricing-grid,
    .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .contact-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links,
    .nav-buttons {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background-color: var(--white);
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-links {
        flex-direction: column;
        gap: 16px;
    }

    .nav-links.active,
    .nav-buttons.active {
        display: flex;
    }

    .nav-buttons {
        top: auto;
        flex-direction: column;
        gap: 12px;
        padding-top: 0;
        border-top: 1px solid var(--border-color);
    }

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

    .mobile-bottom-nav {
        display: flex;
    }

    .footer {
        padding-bottom: 80px;
    }

    .hero-content h1 {
        font-size: 28px;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }

    .mockup {
        max-width: 100%;
    }

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

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

    .contact-info {
        text-align: center;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-links {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero {
        padding: 100px 0 60px;
    }

    .hero-content h1 {
        font-size: 24px;
    }

    .hero-content p:first-of-type {
        font-size: 16px;
    }

    .section-header h2 {
        font-size: 24px;
    }

    .feature-card,
    .pricing-card,
    .testimonial-card {
        padding: 24px 16px;
    }

    .amount {
        font-size: 36px;
    }
}