:root {
    color-scheme: light;
    --ink: #10213d;
    --muted: #5d6a7f;
    --line: #dbe5f0;
    --surface: #ffffff;
    --soft: #f3f7fc;
    --blue: #075fd8;
    --blue-dark: #06469d;
    --cyan: #00bfc5;
    --yellow: #ffc400;
    --shadow: 0 18px 50px rgba(17, 62, 121, 0.12);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--surface);
    color: var(--ink);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: 17px;
    line-height: 1.6;
}

a {
    color: var(--blue-dark);
}

a:hover {
    text-decoration-thickness: 2px;
}

.container {
    width: min(1080px, calc(100% - 40px));
    margin-inline: auto;
}

.site-header {
    border-bottom: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.96);
}

.nav {
    min-height: 76px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 11px;
    color: var(--ink);
    font-weight: 800;
    text-decoration: none;
    letter-spacing: -0.02em;
}

.brand img {
    width: 42px;
    height: 42px;
    border-radius: 12px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 22px;
    font-size: 0.94rem;
}

.nav-links a {
    color: var(--muted);
    font-weight: 650;
    text-decoration: none;
}

.hero {
    overflow: hidden;
    background:
        radial-gradient(circle at 88% 10%, rgba(0, 191, 197, 0.22), transparent 30%),
        linear-gradient(145deg, #f8fbff 0%, #edf6ff 100%);
    border-bottom: 1px solid var(--line);
}

.hero-grid {
    min-height: 560px;
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(260px, 0.75fr);
    align-items: center;
    gap: 72px;
    padding-block: 72px;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 18px;
    color: var(--blue-dark);
    font-size: 0.86rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.eyebrow::before {
    content: "";
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--cyan);
}

h1,
h2,
h3 {
    line-height: 1.15;
    letter-spacing: -0.035em;
}

h1 {
    max-width: 720px;
    margin: 0;
    font-size: clamp(3rem, 7vw, 5.6rem);
}

h2 {
    margin: 0 0 16px;
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    margin: 0 0 8px;
    font-size: 1.2rem;
}

.lead {
    max-width: 660px;
    margin: 22px 0 0;
    color: var(--muted);
    font-size: clamp(1.08rem, 2.2vw, 1.3rem);
}

.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 30px;
}

.button {
    display: inline-flex;
    min-height: 50px;
    align-items: center;
    justify-content: center;
    padding: 12px 21px;
    border: 1px solid var(--blue);
    border-radius: 12px;
    background: var(--blue);
    color: #fff;
    font-weight: 750;
    text-decoration: none;
    box-shadow: 0 10px 24px rgba(7, 95, 216, 0.2);
}

.button:hover {
    background: var(--blue-dark);
}

.button.secondary {
    background: transparent;
    color: var(--blue-dark);
    box-shadow: none;
}

.meta {
    margin-top: 18px;
    color: var(--muted);
    font-size: 0.9rem;
}

.hero-icon {
    width: min(100%, 340px);
    height: auto;
    aspect-ratio: 1 / 1;
    object-fit: contain;
    justify-self: center;
    border-radius: 25%;
    box-shadow: var(--shadow);
}

.section {
    padding-block: 84px;
}

.section.soft {
    background: var(--soft);
    border-block: 1px solid var(--line);
}

.section-intro {
    max-width: 690px;
    margin: 0 0 34px;
    color: var(--muted);
}

.grid-three {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.card {
    padding: 25px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: var(--surface);
}

.card p {
    margin: 0;
    color: var(--muted);
}

.step-number {
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    margin-bottom: 18px;
    border-radius: 10px;
    background: #e6f0ff;
    color: var(--blue-dark);
    font-weight: 850;
}

.notice {
    padding: 24px;
    border: 1px solid #f0d67a;
    border-radius: 16px;
    background: #fff9dd;
}

.notice strong {
    color: #604a00;
}

.checksum {
    display: block;
    overflow-wrap: anywhere;
    margin-top: 12px;
    padding: 12px 14px;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--soft);
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 0.78rem;
    line-height: 1.45;
}

.prose {
    width: min(780px, calc(100% - 40px));
    margin: 0 auto;
    padding-block: 64px 90px;
}

.prose h1 {
    font-size: clamp(2.5rem, 6vw, 4.2rem);
}

.prose h2 {
    margin-top: 48px;
    font-size: 1.65rem;
}

.prose h3 {
    margin-top: 30px;
}

.prose p,
.prose li {
    color: #33435a;
}

.prose .updated {
    margin: 12px 0 38px;
    color: var(--muted);
}

.site-footer {
    padding-block: 34px;
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-size: 0.9rem;
}

.footer-row {
    display: flex;
    justify-content: space-between;
    gap: 24px;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
}

@media (max-width: 760px) {
    .nav {
        align-items: flex-start;
        flex-direction: column;
        padding-block: 14px;
    }

    .nav-links {
        width: 100%;
        justify-content: space-between;
        gap: 12px;
    }

    .hero-grid {
        min-height: auto;
        grid-template-columns: 1fr;
        gap: 44px;
        padding-block: 56px;
    }

    .hero-icon {
        width: 230px;
        grid-row: 1;
    }

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

    .section {
        padding-block: 60px;
    }

    .footer-row {
        flex-direction: column;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}