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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: #111827;
    line-height: 1.6;
    background-color: #ffffff;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.header {
    padding: 24px 0;
    border-bottom: 1px solid #e5e7eb;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: #13B601;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    width: fit-content;
    text-align: center;
    margin: 0 auto;
}

.hero-logo {
    width: 60px;
    height: auto;
    display: block;
    margin: 0 auto 12px;
    padding: 0;
}

.header-logo {
    width: 32px;
    height: auto;
    display: block;
    margin: 0;
    padding: 0;
    border-radius: 8px;
}

.hero {
    background-color: #E5F4D9;
    padding: 80px 0;
    text-align: center;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    color: #111827;
    margin-bottom: 16px;
}

.hero-subtitle {
    font-size: 20px;
    color: #111827;
    font-weight: 400;
    max-width: 600px;
    margin: 0 auto;
}

.store-button-container {
    display: flex;
    max-width: 120px;
    margin: 24px auto 0;
}

.store-button {
    transition: all .3s ease-in-out;
    width: 100%;
}

.store-button img {
    width: 100%;
    height: auto;
    display: block;
}

.store-button:hover, .store-button:focus {
    filter: brightness(1.1);
    transform: scale(1.05);
}

.about {
    padding: 80px 0;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    color: #111827;
    margin-bottom: 24px;
    text-align: center;
}

.about-text {
    font-size: 18px;
    line-height: 1.8;
    color: #111827;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.features {
    background-color: #f9fafb;
    padding: 80px 0;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 48px;
}

.feature-card {
    background-color: #ffffff;
    padding: 32px;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px rgba(19, 182, 1, 0.15);
}

.feature-title {
    font-size: 20px;
    font-weight: 600;
    color: #13B601;
    margin-bottom: 12px;
    line-height: 1.25;
}

.feature-text {
    font-size: 16px;
    line-height: 1.6;
    color: #111827;
}

.data-collection {
    padding: 80px 0;
    background-color: #f9fafb;
}

.devices-guide {
    padding: 80px 0;
}

.guide-link {
    color: #13B601;
    font-size: 18px;
    font-weight: 600;
    text-decoration: none;
    transition: color 0.2s;
}

.guide-link:hover {
    text-decoration: underline;
}

.data-text {
    font-size: 16px;
    line-height: 1.8;
    color: #111827;
    max-width: 800px;
    margin: 0 auto 24px;
}

.data-list {
    max-width: 800px;
    margin: 24px auto;
    padding-left: 24px;
}

.data-list li {
    font-size: 16px;
    line-height: 1.8;
    color: #111827;
    margin-bottom: 16px;
}

.data-list strong {
    color: #13B601;
    font-weight: 600;
}

.contact {
    background-color: #E5F4D9;
    padding: 80px 0;
}

.contact-text {
    font-size: 16px;
    line-height: 1.8;
    color: #111827;
    max-width: 800px;
    margin: 0 auto 12px;
    text-align: center;
}

.contact-text a {
    color: #13B601;
    text-decoration: none;
    font-weight: 500;
}

.contact-text a:hover {
    text-decoration: underline;
}

.footer {
    background-color: #111827;
    color: #ffffff;
    padding: 48px 0 32px;
}

.footer-nav {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.footer-link {
    color: #ffffff;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

.footer-link:hover {
    color: #13B601;
}

.footer-copyright {
    text-align: center;
    font-size: 14px;
    color: #9ca3af;
}

.legal-page {
    padding: 80px 0;
    max-width: 900px;
    margin: 0 auto;
}

.legal-title {
    font-size: 40px;
    font-weight: 700;
    color: #111827;
    margin-bottom: 16px;
}

.legal-updated {
    font-size: 14px;
    color: #6b7280;
    margin-bottom: 48px;
}

.legal-content h2 {
    font-size: 24px;
    font-weight: 600;
    color: #13B601;
    margin-top: 48px;
    margin-bottom: 16px;
}

.legal-content p {
    font-size: 16px;
    line-height: 1.8;
    color: #111827;
    margin-bottom: 16px;
}

.legal-content ul,
.legal-content ol {
    margin: 16px 0 24px 24px;
}

.legal-content li {
    font-size: 16px;
    line-height: 1.8;
    color: #111827;
    margin-bottom: 12px;
}

.legal-content strong {
    font-weight: 600;
    color: #111827;
}

.legal-content a {
    color: #13B601;
    text-decoration: none;
    font-weight: 500;
}

.legal-content a:hover {
    text-decoration: underline;
}

.device-intro {
    padding: 80px 0;
    text-align: center;
}

.device-list {
    list-style: none;
    margin: 24px 0 0;
    padding: 0;
}

.device-list li {
    margin-bottom: 8px;
}

.device-list li a {
    color: #13B601;
    font-size: 18px;
    font-weight: 500;
    text-decoration: none;
}

.device-list li a:hover {
    text-decoration: underline;
}

.device-section {
    padding: 80px 0;
}

.device-section--grey {
    background-color: #f9fafb;
}

.device-section--white {
    background-color: #ffffff;
}

.device-title {
    font-size: 28px;
    font-weight: 600;
    color: #13B601;
    margin-bottom: 32px;
    text-align: center;
}

.device-title small {
    display: block;
    font-size: 16px;
    font-weight: 400;
    color: #6b7280;
    margin-top: 4px;
}

.device-steps {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 32px;
}

.device-step {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 280px;
}

.device-step-img {
    width: 100%;
    max-width: 280px;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    margin-bottom: 16px;
}

.device-step-desc {
    font-size: 15px;
    line-height: 1.6;
    color: #111827;
    max-width: 280px;
}

.device-step--video {
    width: 100%;
    max-width: 640px;
}

.device-video-wrap {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    margin-bottom: 16px;
}

.device-video-wrap iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.device-step--video .device-step-desc {
    max-width: 640px;
    text-align: center;
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 36px;
    }

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

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

    .about,
    .features,
    .data-collection,
    .contact {
        padding: 48px 0;
    }

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

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

    .device-section {
        padding: 48px 0;
    }

    .device-intro {
        padding: 48px 0;
    }

    .device-title {
        font-size: 24px;
    }

    .legal-page {
        padding: 48px 0;
    }

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

    .legal-content h2 {
        font-size: 20px;
    }

    .footer-nav {
        flex-direction: column;
        align-items: center;
        gap: 16px;
    }
}