:root {
    --bg: #0b0b0b;
    --surface: #141414;
    --fg: #fafafa;
    --muted: #a3a3a3;
    --border: #262626;
    --accent: #ffffff;
    --accent-fg: #0b0b0b;
    --radius: 10px;
    --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    height: 100%;
}

body {
    background: var(--bg);
    color: var(--fg);
    font-family: var(--font-sans);
    display: grid;
    place-items: center;
    -webkit-font-smoothing: antialiased;
}

.hero {
    text-align: center;
    padding: 2rem;
    max-width: 38rem;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3.25rem);
    letter-spacing: -0.02em;
    margin: 0 0 0.75rem;
}

.hero p {
    color: var(--muted);
    font-size: 1.05rem;
    line-height: 1.6;
    margin: 0 0 1.75rem;
}

body {
    display: block;
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 2rem;
    border-bottom: 1px solid var(--border);
}

.nav-brand {
    color: var(--fg);
    text-decoration: none;
    font-weight: 600;
    letter-spacing: -0.01em;
    font-size: 1.05rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.nav-links a,
.nav-links button {
    color: var(--muted);
    text-decoration: none;
    font-size: 0.95rem;
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--font-sans);
}

.nav-links a:hover,
.nav-links button:hover {
    color: var(--fg);
}

.nav-user {
    color: var(--fg) !important;
}

main.hero,
main.auth-wrap {
    display: grid;
    place-items: center;
    min-height: calc(100vh - 74px);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.7rem 1.4rem;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    border: 1px solid var(--border);
    cursor: pointer;
    font-family: var(--font-sans);
    transition: opacity 0.15s ease;
}

.btn:hover {
    opacity: 0.85;
}

.btn-primary {
    background: var(--accent);
    color: var(--accent-fg);
    border-color: var(--accent);
}

.btn-ghost {
    background: transparent;
    color: var(--fg);
}

.btn-row {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-block {
    display: flex;
    width: 100%;
}

.auth-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2.25rem;
    width: 100%;
    max-width: 24rem;
    text-align: left;
}

.auth-card h1 {
    font-size: 1.6rem;
    margin: 0 0 0.35rem;
    letter-spacing: -0.02em;
}

.auth-sub {
    color: var(--muted);
    margin: 0 0 1.5rem;
    font-size: 0.95rem;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    margin-bottom: 1.1rem;
    font-size: 0.9rem;
    color: var(--muted);
}

.field input {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.65rem 0.8rem;
    color: var(--fg);
    font-family: var(--font-sans);
    font-size: 0.95rem;
}

.field input:focus {
    outline: 2px solid var(--accent);
    outline-offset: 1px;
}

.form-error {
    background: rgba(220, 38, 38, 0.12);
    border: 1px solid rgba(220, 38, 38, 0.4);
    color: #fca5a5;
    border-radius: var(--radius);
    padding: 0.6rem 0.8rem;
    font-size: 0.88rem;
    margin-bottom: 1.1rem;
}

.form-success {
    background: rgba(34, 197, 94, 0.12);
    border: 1px solid rgba(34, 197, 94, 0.4);
    color: #86efac;
    border-radius: var(--radius);
    padding: 0.6rem 0.8rem;
    font-size: 0.88rem;
    margin-bottom: 1.1rem;
}

.db-banner {
    background: rgba(234, 179, 8, 0.12);
    border: 1px solid rgba(234, 179, 8, 0.4);
    color: #fde68a;
    border-radius: var(--radius);
    padding: 0.6rem 0.8rem;
    font-size: 0.85rem;
    margin-bottom: 1.1rem;
}

.auth-alt {
    margin: 1.25rem 0 0;
    text-align: center;
    font-size: 0.9rem;
    color: var(--muted);
}

.auth-alt a {
    color: var(--fg);
}