:root {
    color-scheme: dark;
    --background: #071018;
    --surface: #0d1b26;
    --surface-strong: #122736;
    --text: #f4f8fb;
    --muted: #a9bbc8;
    --cyan: #45d9ff;
    --amber: #ffb447;
    --border: #244456;
    --max-width: 940px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.7;
    color: var(--text);
    background:
        radial-gradient(circle at 85% 8%, rgba(69, 217, 255, 0.13), transparent 25rem),
        radial-gradient(circle at 12% 88%, rgba(255, 180, 71, 0.09), transparent 28rem),
        var(--background);
}

a {
    color: var(--cyan);
}

a:hover,
a:focus-visible {
    color: #a6eeff;
}

.site-header,
.site-footer,
main {
    width: min(calc(100% - 2rem), var(--max-width));
    margin-inline: auto;
}

.site-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding-block: 1.5rem;
}

.brand {
    color: var(--text);
    font-weight: 800;
    letter-spacing: 0.04em;
    text-decoration: none;
}

.brand span {
    color: var(--cyan);
}

nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.9rem;
}

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

.hero,
.panel {
    border: 1px solid var(--border);
    border-radius: 1rem;
    background: linear-gradient(145deg, rgba(18, 39, 54, 0.95), rgba(10, 24, 34, 0.95));
    box-shadow: 0 1.5rem 4rem rgba(0, 0, 0, 0.24);
}

.hero {
    padding: clamp(2rem, 7vw, 5rem);
    margin-block: 2rem;
}

.hero h1,
.content h1 {
    margin: 0 0 0.7rem;
    font-size: clamp(2.3rem, 7vw, 4.8rem);
    line-height: 1.05;
}

.eyebrow {
    color: var(--amber);
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.lead {
    max-width: 67ch;
    color: var(--muted);
    font-size: 1.12rem;
}

.link-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.85rem;
    margin-top: 1.5rem;
}

.link-card {
    display: block;
    border: 1px solid var(--border);
    border-radius: 0.7rem;
    padding: 0.9rem 1rem;
    color: var(--text);
    background: rgba(69, 217, 255, 0.08);
    font-weight: 700;
    text-decoration: none;
}

.content {
    padding: clamp(1.5rem, 5vw, 3.5rem);
    margin-block: 2rem;
}

.content h1 {
    font-size: clamp(2rem, 6vw, 3.4rem);
}

.content h2 {
    margin-top: 2.4rem;
    padding-bottom: 0.45rem;
    border-bottom: 1px solid var(--border);
    color: var(--cyan);
}

.content h3 {
    margin-top: 1.6rem;
    color: var(--amber);
}

.content p,
.content li {
    color: #d7e2e9;
}

.notice {
    margin-block: 1.5rem;
    padding: 1rem 1.2rem;
    border-left: 0.25rem solid var(--cyan);
    border-radius: 0 0.6rem 0.6rem 0;
    background: rgba(69, 217, 255, 0.08);
}

.meta {
    color: var(--muted);
}

.site-footer {
    padding-block: 2rem 3rem;
    color: var(--muted);
    text-align: center;
}

@media (max-width: 620px) {
    .site-header {
        align-items: flex-start;
        flex-direction: column;
    }

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