:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --text-primary: #f0f6fc;
    --text-secondary: #b0bac5;
    --text-muted: #768390;
    --border: #30363d;
    --unit: #58a6ff;
    --pass: #3fb950;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
}

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

body {
    margin: 0;
    font-family: var(--font-sans);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

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

a:hover {
    text-decoration: underline;
}

.wrap {
    width: 100%;
    max-width: 960px;
    margin-inline: auto;
    padding-inline: 1.5rem;
}

h1,
h2 {
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.eyebrow {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--unit);
    margin: 0 0 0.75rem;
}

.lead {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 62ch;
    margin: 0;
}

.hero {
    padding-block: 6rem 4rem;
    background:
        radial-gradient(120% 90% at 15% 0%, rgba(88, 166, 255, 0.14), transparent 55%),
        radial-gradient(120% 90% at 90% 110%, rgba(63, 185, 80, 0.14), transparent 55%),
        var(--bg-primary);
}

.brandmark {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
}

.brandmark .cursor {
    animation: blink 1.1s steps(1) 5 forwards;
    color: var(--unit);
}

@keyframes blink {
    50% {
        opacity: 0;
    }
}

.hero h1 {
    font-size: clamp(2.2rem, 5.2vw, 3.4rem);
    margin: 0 0 1.25rem;
}

.hero h1 .accent {
    background: linear-gradient(100deg, var(--unit), var(--pass));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

main {
    padding-block: 4rem 5rem;
}

.courses {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 1.25rem;
}

.courses a {
    display: block;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem 1.75rem;
    color: inherit;
    text-decoration: none;
    transition: border-color 0.15s ease;
}

.courses a:hover {
    border-color: var(--unit);
    text-decoration: none;
}

.courses h2 {
    font-size: 1.3rem;
    margin: 0 0 0.5rem;
}

.courses h2 i {
    font-size: 0.9rem;
    color: var(--unit);
    margin-left: 0.25rem;
}

.courses p {
    margin: 0;
    color: var(--text-secondary);
}

footer {
    border-top: 1px solid var(--border);
    padding-block: 2.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-inner {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem 1.5rem;
    align-items: center;
    justify-content: space-between;
}

.footer-inner .logo {
    font-family: var(--font-mono);
    color: var(--text-secondary);
}

.footer-inner .logo .cursor {
    color: var(--unit);
    animation: blink 1.1s steps(1) 5 forwards;
}

.footer-links a {
    color: var(--text-muted);
    margin-left: 1.25rem;
}

.footer-links a:first-child {
    margin-left: 0;
}

.footer-org {
    margin-top: 1rem;
}