:root {
    --color-bg: #0f172a;
    --color-text: #f8fafc;
    --color-text-muted: #94a3b8;
    --color-brand: #10b981;
    --color-brand-hover: #34d399;
    --color-surface: #1e293b;
    --color-border: #334155;
    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
}

a {
    color: var(--color-brand);
    text-decoration: none;
}

a:hover {
    color: var(--color-brand-hover);
}

a:focus {
    outline: 2px solid var(--color-brand);
    outline-offset: 2px;
}

a:focus:not(:focus-visible) {
    outline: none;
}

a:focus-visible {
    outline: 2px solid var(--color-brand);
    outline-offset: 2px;
}

.nav {
    max-width: 80rem;
    margin: 0 auto;
    padding: 1.5rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

@media (min-width: 640px) {
    .nav {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }
}

@media (min-width: 1024px) {
    .nav {
        padding-left: 2rem;
        padding-right: 2rem;
    }
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo {
    width: 2.5rem;
    height: 2.5rem;
    background: var(--color-brand);
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
    box-shadow: 0 10px 15px -3px rgba(16, 185, 129, 0.2);
}

.brand-text {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.025em;
}

.nav-link {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-muted);
    transition: color 0.15s ease;
}

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

.hero {
    max-width: 80rem;
    margin: 0 auto;
    padding: 4rem 1rem 6rem;
    text-align: center;
}

@media (min-width: 640px) {
    .hero {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }
}

@media (min-width: 1024px) {
    .hero {
        padding-top: 8rem;
        padding-bottom: 10rem;
        padding-left: 2rem;
        padding-right: 2rem;
    }
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    margin-bottom: 2rem;
    line-height: 1.1;
}

@media (min-width: 768px) {
    .hero-title {
        font-size: 4.5rem;
    }
}

.hero-break {
    display: none;
}

@media (min-width: 640px) {
    .hero-break {
        display: inline;
    }
}

.hero-accent {
    color: var(--color-brand);
}

.hero-description {
    max-width: 42rem;
    margin: 0 auto 2.5rem;
    font-size: 1.125rem;
    color: var(--color-text-muted);
    line-height: 1.75;
}

@media (min-width: 768px) {
    .hero-description {
        font-size: 1.25rem;
    }
}

.app-store-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.app-store-badge {
    display: block;
    width: 100%;
    max-width: 180px;
    height: auto;
}

.hero-visual {
    max-width: 26rem;
    margin: 5rem auto 0;
}

.carousel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

.carousel-stage {
    position: relative;
    width: min(78vw, 360px);
    min-height: 640px;
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: 2.5rem;
    background: linear-gradient(180deg, #1e293b 0%, #0f172a 100%);
    box-shadow: 0 30px 60px rgba(15, 23, 42, 0.5);
    overflow: hidden;
}

.carousel-slide {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.carousel-slide.is-active {
    display: flex;
}

.carousel-image {
    display: block;
    width: 100%;
    max-height: 560px;
    object-fit: contain;
    border-radius: 1.75rem;
    background: #0b1120;
}

.carousel-caption {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    text-align: center;
}

.carousel-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.carousel-button {
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text);
    border-radius: 999px;
    padding: 0.65rem 1rem;
    font: inherit;
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease;
}

.carousel-button:hover {
    background: #273449;
}

.carousel-dots {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.carousel-dot {
    width: 0.7rem;
    height: 0.7rem;
    border: 0;
    border-radius: 999px;
    background: #475569;
    cursor: pointer;
    transition: transform 0.15s ease, background 0.15s ease;
}

.carousel-dot.is-active {
    background: var(--color-brand);
    transform: scale(1.1);
}

.carousel-button:focus-visible,
.carousel-dot:focus-visible {
    outline: 2px solid var(--color-brand);
    outline-offset: 2px;
}

@media (max-width: 640px) {
    .hero-visual {
        max-width: 22rem;
    }

    .carousel-stage {
        width: min(84vw, 320px);
        min-height: 580px;
        border-radius: 2rem;
    }

    .carousel-image {
        max-height: 500px;
        border-radius: 1.4rem;
    }

    .carousel-controls {
        gap: 0.75rem;
    }
}

.features {
    background: #020617;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    padding: 6rem 1rem;
}

@media (min-width: 640px) {
    .features {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }
}

@media (min-width: 1024px) {
    .features {
        padding-left: 2rem;
        padding-right: 2rem;
    }
}

.features-grid {
    max-width: 80rem;
    margin: 0 auto;
    display: grid;
    gap: 3rem;
}

@media (min-width: 768px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.feature {
    text-align: center;
}

.feature-icon {
    width: 3rem;
    height: 3rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin: 0 auto 1.5rem;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.feature-description {
    color: var(--color-text-muted);
    line-height: 1.75;
}

.testimonial {
    max-width: 56rem;
    margin: 0 auto;
    padding: 6rem 1rem;
    text-align: center;
}

@media (min-width: 640px) {
    .testimonial {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }
}

@media (min-width: 1024px) {
    .testimonial {
        padding-left: 2rem;
        padding-right: 2rem;
    }
}

.testimonial-stars {
    color: var(--color-brand);
    font-size: 1.875rem;
    margin-bottom: 1.5rem;
}

.testimonial-quote {
    font-size: 1.5rem;
    font-weight: 500;
    line-height: 1.4;
    margin-bottom: 2rem;
}

@media (min-width: 768px) {
    .testimonial-quote {
        font-size: 1.875rem;
    }
}

.testimonial-cite {
    display: block;
    color: var(--color-text-muted);
    font-style: normal;
    margin-bottom: 3rem;
}

.footer {
    border-top: 1px solid var(--color-border);
    padding: 3rem 1rem;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    text-align: center;
}

.footer-content {
    max-width: 80rem;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

@media (min-width: 768px) {
    .footer-content {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
}

.footer-copyright {
    margin: 0;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-link {
    color: var(--color-text-muted);
    transition: color 0.15s ease;
}

.footer-link:hover {
    color: var(--color-text);
}

.privacy-nav {
    max-width: 48rem;
    margin: 0 auto;
    padding: 2rem 1rem;
}

@media (min-width: 640px) {
    .privacy-nav {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }
}

@media (min-width: 1024px) {
    .privacy-nav {
        padding-left: 2rem;
        padding-right: 2rem;
    }
}

.back-link {
    display: inline-flex;
    align-items: center;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-brand);
}

.back-link:hover {
    color: var(--color-brand-hover);
}

.privacy-content {
    max-width: 48rem;
    margin: 0 auto;
    padding: 0 1rem 6rem;
}

@media (min-width: 640px) {
    .privacy-content {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }
}

@media (min-width: 1024px) {
    .privacy-content {
        padding-left: 2rem;
        padding-right: 2rem;
    }
}

.article-title {
    font-size: 2.25rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    margin-bottom: 1rem;
}

.article-date {
    color: var(--color-text-muted);
    margin-bottom: 3rem;
}

.article-intro {
    font-size: 1.125rem;
    line-height: 1.75;
    margin-bottom: 2rem;
}

.article-highlight {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    line-height: 1.75;
    padding-left: 1rem;
    border-left: 4px solid var(--color-brand);
    margin-bottom: 3rem;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: 3rem;
    margin-bottom: 1.5rem;
}

.section-paragraph {
    color: var(--color-text-muted);
    font-size: 1rem;
    line-height: 1.75;
    margin-bottom: 2rem;
}

.section-list {
    color: var(--color-text-muted);
    margin-bottom: 2rem;
    padding-left: 1.5rem;
}

.section-list li {
    margin-bottom: 1rem;
    line-height: 1.75;
}

.section-list li:last-child {
    margin-bottom: 0;
}

.callout-box {
    background: var(--color-surface);
    padding: 1rem;
    border-radius: 0.5rem;
    margin-bottom: 2rem;
    color: var(--color-text-muted);
    line-height: 1.75;
}

.contact-link {
    display: inline-block;
    margin-top: 0.5rem;
    font-weight: 600;
}