:root {
    --color-bg: #ffffff;
    --color-text: #1d1d1f;
    --color-text-secondary: #6e6e73;
    --color-border: #d2d2d7;
    --color-surface: #f5f5f7;
    --color-link: #6e6e73;
    --color-link-hover: #1d1d1f;
    --color-card-bg: #f5f5f7;
    --color-card-border: rgba(0, 0, 0, 0.06);
    --color-nav-bg: rgba(255, 255, 255, 0.8);
    --color-nav-border: rgba(0, 0, 0, 0.08);
    --gradient-primary: linear-gradient(135deg, #0066ff, #5a4cf5, #8338ec);
    --glow-color-1: rgba(0, 102, 255, 0.3);
    --glow-color-2: rgba(131, 56, 236, 0.3);
    --color-button-bg: #0066ff;
    --color-button-text: #ffffff;
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #1c1c1e;
        --color-text: #f5f5f7;
        --color-text-secondary: #a1a1a6;
        --color-border: #38383a;
        --color-surface: #2c2c2e;
        --color-link: #a1a1a6;
        --color-link-hover: #f5f5f7;
        --color-card-bg: #2c2c2e;
        --color-card-border: rgba(255, 255, 255, 0.08);
        --color-nav-bg: rgba(28, 28, 30, 0.8);
        --color-nav-border: rgba(255, 255, 255, 0.08);
        --glow-color-1: rgba(0, 102, 255, 0.25);
        --glow-color-2: rgba(131, 56, 236, 0.25);
    }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Sticky Navigation */

.sticky-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-nav-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-nav-border);
}

.nav-inner {
    max-width: 1000px;
    margin: 0 auto;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--color-text);
}

.nav-brand img {
    width: 32px;
    height: 32px;
}

.nav-brand span {
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.nav-download {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: var(--color-button-bg);
    color: var(--color-button-text);
    border-radius: 980px;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 600;
    transition: opacity 0.2s;
}

.nav-download:hover {
    opacity: 0.85;
}

/* Hero */

.hero {
    max-width: 700px;
    margin: 0 auto;
    padding: 80px 20px 40px;
    text-align: center;
}

.hero-headline {
    font-size: 5rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.1;
    padding-bottom: 0.1em;
    margin-bottom: 20px;
    background: linear-gradient(180deg, var(--color-text) 30%, var(--color-text-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    max-width: 540px;
    margin: 0 auto;
}

.app-store-badge {
    display: inline-block;
    margin-top: 24px;
    transition: transform 0.2s ease;
}

.app-store-badge:hover {
    transform: scale(1.05);
}

.app-store-badge:active {
    transform: scale(0.97);
}

.app-store-badge img {
    height: 54px;
    width: auto;
}

/* Device Showcase */

.device-showcase {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px 20px 80px;
}

.device-glow {
    position: absolute;
    width: 500px;
    height: 600px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 102, 255, 0.35) 0%, rgba(0, 102, 255, 0.15) 40%, transparent 70%);
    filter: blur(80px);
    pointer-events: none;
}

.device-frame {
    position: relative;
    width: 260px;
    height: auto;
    border-radius: 40px;
    border: 4px solid var(--color-border);
    background: var(--color-card-bg);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 10px;
}

.device-screen {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 28px;
}

/* Features */

.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px 80px;
}

.feature-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    border-radius: 16px;
    padding: 32px 24px;
    text-align: center;
}

.feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    margin: 0 auto 16px;
    border-radius: 14px;
    background: var(--color-bg);
    border: 1px solid var(--color-card-border);
    color: var(--color-text);
}

.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

/* Testimonials */

.testimonials {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px 80px;
}

.section-heading {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 40px;
    letter-spacing: -0.02em;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.testimonial-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    border-radius: 16px;
    padding: 28px 24px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.testimonial-stars {
    color: var(--color-text);
    font-size: 1rem;
    letter-spacing: 2px;
    margin-bottom: 12px;
}

.testimonial-quote {
    font-size: 1rem;
    font-style: italic;
    line-height: 1.6;
    margin-bottom: 20px;
    color: var(--color-text);
}

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

.testimonial-name {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text);
}

.testimonial-source {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
}

/* Under the Hood */

.under-the-hood {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px 80px;
}

.hood-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 32px;
}

.hood-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    border-radius: 16px;
    padding: 32px 24px;
    text-align: center;
}

.hood-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    border-radius: 16px;
    background: var(--color-bg);
    border: 1px solid var(--color-card-border);
    color: var(--color-text);
}

.hood-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.hood-card p {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

.compliance-footnote {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.compliance-footnote a {
    color: var(--color-link);
    text-decoration: none;
}

.compliance-footnote a:hover {
    color: var(--color-link-hover);
    text-decoration: underline;
}

/* Bottom CTA */

.bottom-cta {
    text-align: center;
    padding: 60px 20px 80px;
    max-width: 600px;
    margin: 0 auto;
}

.bottom-cta h2 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

.bottom-cta p {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    margin-bottom: 32px;
    line-height: 1.6;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    background: var(--color-button-bg);
    color: var(--color-button-text);
    border-radius: 980px;
    text-decoration: none;
    font-size: 1rem;
    font-weight: 600;
    transition: opacity 0.2s;
}

.cta-button:hover {
    opacity: 0.85;
}

/* Footer */

main {
    flex: 1;
}

footer {
    max-width: 600px;
    margin: 0 auto;
    padding: 30px 20px 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    border-top: 1px solid var(--color-card-border);
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--color-link);
    text-decoration: none;
}

.footer-links a:hover {
    color: var(--color-link-hover);
    text-decoration: underline;
}

.attribution a {
    color: var(--color-link);
    text-decoration: none;
}

.attribution a:hover {
    color: var(--color-link-hover);
    text-decoration: underline;
}

/* Legal pages (privacy, terms) */

.legal-page {
    max-width: 700px;
    margin: 0 auto;
    padding: 40px 20px 60px;
}

.legal-page h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.legal-page .last-updated {
    color: var(--color-text-secondary);
    font-style: italic;
    margin-bottom: 32px;
}

.legal-page h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 32px 0 12px;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--color-border);
}

.legal-page p {
    margin-bottom: 14px;
    color: var(--color-text);
    line-height: 1.7;
}

.legal-page ul {
    margin: 12px 0 16px;
    padding-left: 24px;
}

.legal-page li {
    margin-bottom: 8px;
    line-height: 1.7;
}

.legal-page a {
    color: var(--color-link);
    text-decoration: underline;
}

.legal-page a:hover {
    color: var(--color-link-hover);
}

.back-link {
    display: inline-block;
    margin-top: 32px;
    color: var(--color-link);
    text-decoration: none;
    font-weight: 500;
}

.back-link:hover {
    color: var(--color-link-hover);
    text-decoration: underline;
}

/* Responsive */

@media (max-width: 768px) {
    .hero {
        padding: 60px 16px 32px;
    }

    .hero-headline {
        font-size: 3.5rem;
    }

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

    .features {
        grid-template-columns: 1fr;
        max-width: 480px;
    }

    .testimonials-grid {
        grid-template-columns: 1fr;
        max-width: 480px;
        margin: 0 auto;
    }

    .hood-grid {
        grid-template-columns: 1fr;
        max-width: 480px;
        margin: 0 auto 32px;
    }

    .device-frame {
        width: 220px;
        height: 440px;
    }

    .device-glow {
        width: 280px;
        height: 280px;
    }

    .section-heading {
        font-size: 1.75rem;
    }

    .bottom-cta h2 {
        font-size: 1.75rem;
    }

    .legal-page {
        padding: 32px 16px 48px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 48px 16px 24px;
    }

    .hero-headline {
        font-size: 2.75rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .nav-brand span {
        font-size: 1rem;
    }

    .nav-download {
        padding: 6px 12px;
        font-size: 0.8rem;
    }

    .device-showcase {
        padding: 16px 16px 56px;
    }

    .device-frame {
        width: 200px;
        height: 400px;
        border-radius: 32px;
    }

    .device-glow {
        width: 240px;
        height: 240px;
    }

    .features {
        padding: 0 16px 56px;
    }

    .testimonials {
        padding: 0 16px 56px;
    }

    .under-the-hood {
        padding: 0 16px 56px;
    }

    .bottom-cta {
        padding: 40px 16px 56px;
    }

    .bottom-cta h2 {
        font-size: 1.5rem;
    }

    .section-heading {
        font-size: 1.5rem;
        margin-bottom: 28px;
    }

    footer {
        padding: 24px 16px 32px;
    }

    .legal-page h1 {
        font-size: 1.5rem;
    }
}