:root {
    --brand: rgb(10, 172, 106);
    --bg: #ffffff;
    --fg: #111111;
    --muted: #666666;
    --card: rgba(0, 0, 0, 0.04);
    --radius: 20px;
}

* {
    box-sizing: border-box;
}

html, body {
    height: 100%;
}

body {
    margin: 0;
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-weight: 300;
    color: var(--fg);
    background: var(--bg);
}

.container {
    width: min(1200px, 100%);
    margin: 0 auto;
    padding: 0 clamp(16px, 3vw, 32px);
}

section {
    padding: clamp(40px, 8vh, 96px) 0;
}

header.site {
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: saturate(160%) blur(6px);
    background: color-mix(in srgb, #fff 70%, transparent);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    font-weight: 800;
    letter-spacing: 0.08em;
    font-size: 18px;
    user-select: none;
    text-rendering: geometricPrecision;
    line-height: 1;
}

.logo .brand {
    color: #000;
    text-transform: uppercase;
}

.logo .tld {
    color: var(--brand);
    text-transform: lowercase;
}

.slogan {
    color: var(--brand);
    font-size: 16px;
    letter-spacing: 0;
}

.nav a.cta {
    padding: 10px 16px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 999px;
    text-decoration: none;
    color: #000;
    font-weight: 600;
    transition: transform .12s ease, box-shadow .12s ease;
}

.nav a.cta:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 18px rgba(0, 0, 0, 0.06);
}

.hero {
    background: radial-gradient(800px 500px at -10% -10%, rgba(10, 172, 106, 0.10), transparent 60%),
    radial-gradient(900px 600px at 110% 110%, rgba(10, 172, 106, 0.08), transparent 60%),
    var(--bg);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: clamp(20px, 4vw, 48px);
    align-items: center;
}

.hero h1 {
    margin: 0 0 12px 0;
    font-size: clamp(32px, 6.4vw, 64px);
    letter-spacing: -0.02em;
    font-weight: 400;
}

.hero p.lead {
    margin: 0 0 24px 0;
    font-size: clamp(16px, 1.4vw, 20px);
    color: var(--muted);
    max-width: 56ch;
}

.actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 18px;
    border-radius: 14px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    text-decoration: none;
    font-weight: 600;
}

.btn.primary {
    background: var(--brand);
    color: #fff;
    border-color: transparent;
}

.btn.secondary {
    background: #000;
    color: var(--brand);
    border-color: transparent;
}

@media (prefers-color-scheme: dark) {
    .btn.secondary {
        background: #fff;
        color: var(--brand);
        border-color: transparent;
    }
}

.section-title {
    margin: 0 0 10px 0;
    font-size: clamp(22px, 3.4vw, 36px);
    letter-spacing: -0.01em;
    font-weight: 400;
    text-align: center;
}

.section-sub {
    margin: 0 auto 36px;
    text-align: center;
    color: var(--muted);
    max-width: 70ch;
}

.features, .insights {
    display: grid;
    gap: clamp(14px, 2.4vw, 24px);
}

.features {
    grid-template-columns: repeat(4, 1fr);
}

.insights {
    grid-template-columns: repeat(3, 1fr);
}

.feature, .insight {
    padding: 18px;
    border-radius: 16px;
    border: 1px solid rgba(0, 0, 0, 0.06);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.85), rgba(255, 255, 255, 0.75));
}

.feature h3, .insight h3 {
    margin: 0 0 6px 0;
    font-size: 18px;
    color: var(--brand);
    font-weight: 600;
}

.feature p, .insight p {
    margin: 0;
    color: var(--fg);
    font-size: 15px;
}

.insight p + p {
    margin-top: 5px;
}

.module-icon {
    font-size: 28px;
    margin-bottom: 10px;
    line-height: 1;
}

.steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
}

.step {
    padding: 18px;
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: 16px;
    background: #fff;
}

.step h4 {
    margin: 0 0 8px;
    font-size: 16px;
    color: var(--brand);
    font-weight: 700;
}

.step p {
    margin: 0;
    font-size: 15px;
    color: var(--fg);
}

.lang-switcher {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    border-radius: 999px;
    background: rgba(0, 0, 0, 0.04);
    border: 1px solid rgba(0, 0, 0, 0.08);
    backdrop-filter: blur(4px);
    font-weight: 500;
}

.lang-switcher a {
    text-decoration: none;
    color: var(--muted);
    font-size: 14px;
    padding: 4px 8px;
    border-radius: 6px;
    transition: color .15s ease, background .15s ease;
}

.lang-switcher a.active {
    background: var(--brand);
    color: #fff;
}

.lang-switcher a:not(.active):hover {
    color: var(--fg);
}

footer.site {
    border-top: 1px solid rgba(0, 0, 0, 0.06);
    padding: 18px 0;
    color: var(--muted);
    font-size: 14px;
}

.breadcrumb {
    font-size: 14px;
    color: var(--muted);
    margin-bottom: 24px;
}

.breadcrumb a {
    color: var(--muted);
    text-decoration: none;
}

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

.breadcrumb span + span::before {
    content: ' › ';
    padding: 0 4px;
}

.prose {
    max-width: 72ch;
    margin: 0 auto;
    line-height: 1.75;
    font-size: 16px;
    color: var(--fg);
}

.prose h2 {
    font-size: clamp(20px, 2.4vw, 28px);
    font-weight: 600;
    margin: 2.5rem 0 0.75rem;
    letter-spacing: -0.01em;
}

.prose h3 {
    font-size: 18px;
    font-weight: 600;
    margin: 1.75rem 0 0.5rem;
    color: var(--brand);
}

.prose p {
    margin: 0 0 1rem;
}

.prose ul {
    padding-left: 1.5rem;
    margin: 0 0 1rem;
}

.prose li {
    margin-bottom: 0.35rem;
}

.prose a {
    color: var(--brand);
}

.prose .updated {
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 2rem;
}

@media (max-width: 960px) {
    .features, .insights {
        grid-template-columns: 1fr 1fr;
    }

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

@media (max-width: 560px) {
    .features, .insights {
        grid-template-columns: 1fr;
    }

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

    .logo {
        font-size: 11px;
    }

    .slogan {
        font-size: 10px;
    }

    .lang-switcher {
        gap: 3px;
        padding: 3px 7px;
    }

    .lang-switcher a {
        font-size: 11px;
        padding: 3px 7px;
    }

    .nav a.cta {
        padding: 7px 11px;
        font-size: 11px;
    }
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0c0c0c;
        --fg: #f2f2f2;
        --muted: #a1a1a1;
    }

    body {
        background: var(--bg);
    }

    .nav a.cta {
        background: #111;
        color: #f2f2f2;
        border-color: rgba(255, 255, 255, 0.12);
    }

    .feature, .insight, .step {
        background: linear-gradient(180deg, rgba(20, 20, 20, 0.7), rgba(20, 20, 20, 0.6));
        border-color: rgba(255, 255, 255, 0.06);
    }

    .logo .brand {
        color: #fff;
    }

    .lang-switcher {
        background: rgba(255, 255, 255, 0.06);
        border-color: rgba(255, 255, 255, 0.12);
    }

    .lang-switcher a {
        color: var(--muted);
    }

    .lang-switcher a.active {
        background: var(--brand);
        color: #000;
    }

    .lang-switcher a:not(.active):hover {
        color: #fff;
    }
}