:root {
    --bg: #0e1117;
    --card: #161b22;
    --card-2: #11161d;
    --text: #e6edf3;
    --muted: #8b949e;
    --line: #30363d;
    --accent: #58a6ff;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background:
        radial-gradient(circle at top left, rgba(88, 166, 255, 0.16), transparent 32rem),
        var(--bg);
    color: var(--text);
    font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

a:hover {
    text-decoration: underline;
}

code, pre {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

pre {
    overflow-x: auto;
    padding: 1rem;
    background: #0b0f14;
    border: 1px solid var(--line);
    border-radius: 0.75rem;
    white-space: pre-wrap;
}

.topbar {
    height: 4rem;
    padding: 0 2rem;
    border-bottom: 1px solid var(--line);
    background: rgba(14, 17, 23, 0.88);
    display: flex;
    align-items: center;
    justify-content: space-between;
    backdrop-filter: blur(10px);
}

.brand {
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.03em;
}

nav {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.container {
    max-width: 920px;
    margin: 0 auto;
    padding: 2rem;
}

.hero {
    padding: 4rem 0 2rem;
}

.hero h1 {
    max-width: 780px;
    margin: 0 0 1rem;
    font-size: clamp(2.2rem, 6vw, 4.5rem);
    line-height: 0.95;
    letter-spacing: -0.08em;
}

.hero p {
    max-width: 680px;
    color: var(--muted);
    font-size: 1.15rem;
}

.card {
    background: linear-gradient(180deg, var(--card), var(--card-2));
    border: 1px solid var(--line);
    border-radius: 1rem;
    padding: 1.25rem;
    margin: 1rem 0;
    box-shadow: 0 14px 40px rgba(0, 0, 0, 0.18);
}

.card h1, .card h2, .card h3 {
    margin-top: 0;
}

.subtle {
    background: rgba(22, 27, 34, 0.62);
}

.narrow {
    max-width: 520px;
}

.flashes {
    margin-bottom: 1rem;
}

.flash {
    border: 1px solid var(--line);
    background: rgba(88, 166, 255, 0.12);
    padding: 0.85rem 1rem;
    border-radius: 0.75rem;
    margin-bottom: 0.5rem;
}

form {
    display: grid;
    gap: 0.8rem;
}

label {
    color: var(--muted);
    font-weight: 600;
}

input {
    width: 100%;
    border: 1px solid var(--line);
    background: #0b0f14;
    color: var(--text);
    border-radius: 0.65rem;
    padding: 0.75rem;
}

button {
    background: var(--accent);
    color: #07111f;
    border: none;
    border-radius: 0.65rem;
    padding: 0.65rem 0.9rem;
    font-weight: 700;
    cursor: pointer;
    width: fit-content;
}

button:hover {
    filter: brightness(1.06);
}