:root {
    --bg: #0d1117;
    --bg-raised: #161b22;
    --bg-hover: #1f2733;
    --border: #26303d;
    --text: #e6edf3;
    --text-muted: #8b98a8;
    --accent: #58d6c9;
    --accent-soft: rgba(88, 214, 201, 0.12);
    --radius: 10px;
    --font: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
    --mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    color-scheme: dark;
}

body {
    margin: 0;
    min-height: 100vh;
    background-color: var(--bg);
    background-image:
        radial-gradient(60rem 30rem at 15% -10%, rgba(88, 214, 201, 0.10), transparent 70%),
        radial-gradient(50rem 30rem at 90% 0%, rgba(120, 130, 255, 0.10), transparent 70%);
    color: var(--text);
    font-family: var(--font);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

.page {
    max-width: 46rem;
    margin: 0 auto;
    padding: 4rem 1.5rem 3rem;
}

/* --- masthead ------------------------------------------------------- */

.masthead {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

.masthead h1 {
    margin: 0;
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    letter-spacing: -0.02em;
    background: linear-gradient(100deg, var(--text) 30%, var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* --- navigation ----------------------------------------------------- */

.site-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

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

.nav-root > li {
    position: relative;
}

.nav-root > li > button,
.nav-root > li > a {
    display: inline-block;
    padding: 0.45rem 0.9rem;
    border: 1px solid transparent;
    border-radius: var(--radius);
    background: none;
    color: var(--text-muted);
    font: inherit;
    font-size: 0.95rem;
    text-decoration: none;
    cursor: pointer;
    transition: color 0.15s ease, background-color 0.15s ease, border-color 0.15s ease;
}

.nav-root > li > button:hover,
.nav-root > li > a:hover,
.nav-root > li > button:focus-visible,
.nav-root > li > a:focus-visible {
    color: var(--text);
    background-color: var(--bg-hover);
    border-color: var(--border);
}

.menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 0;
    z-index: 10;
    min-width: 13rem;
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background-color: var(--bg-raised);
    box-shadow: 0 14px 32px rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-0.35rem);
    transition: opacity 0.15s ease, transform 0.15s ease, visibility 0.15s;
}

.has-menu:hover .menu,
.has-menu:focus-within .menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.menu a {
    display: block;
    padding: 0.35rem 0.6rem;
    border-radius: 6px;
    color: var(--text);
    font-size: 0.95rem;
    text-decoration: none;
}

.menu a:hover,
.menu a:focus-visible {
    background-color: var(--accent-soft);
    color: var(--accent);
}

.submenu {
    margin-top: 0.15rem;
    padding-left: 0.6rem;
    border-left: 1px solid var(--border);
}

.submenu li {
    padding: 0.2rem 0.6rem;
    color: var(--text-muted);
    font-family: var(--mono);
    font-size: 0.8rem;
}

/* --- intro ---------------------------------------------------------- */

.intro {
    padding: 3rem 0;
}

.eyebrow {
    margin: 0 0 0.75rem;
    color: var(--accent);
    font-family: var(--mono);
    font-size: 0.8rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.lede {
    margin: 0;
    max-width: 34rem;
    font-size: clamp(1.05rem, 2.5vw, 1.35rem);
    color: var(--text-muted);
}

/* --- footer --------------------------------------------------------- */

.site-footer {
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.site-footer h2 {
    margin: 0 0 1rem;
    color: var(--text-muted);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.links a {
    display: inline-block;
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    border-radius: 999px;
    background-color: var(--bg-raised);
    color: var(--text);
    font-size: 0.9rem;
    text-decoration: none;
    transition: color 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.links a:hover,
.links a:focus-visible {
    color: var(--accent);
    border-color: var(--accent);
    transform: translateY(-2px);
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

@media (max-width: 30rem) {
    .masthead {
        justify-content: flex-start;
    }

    .menu {
        left: auto;
        right: 0;
    }
}