:root {
    --bg: #0f1320;
    --panel: #1a2033;
    --text: #e6e9f0;
    --muted: #9aa3b8;
    --accent: #5b8cff;
    --border: #2a3147;
    --ok-bg: #13331f; --ok-fg: #7ee29a;
    --err-bg: #3a1620; --err-fg: #ff8fa3;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

.wrap { width: min(960px, 92vw); margin: 0 auto; }

.site-header {
    border-bottom: 1px solid var(--border);
    background: rgba(26, 32, 51, 0.6);
    position: sticky; top: 0; backdrop-filter: blur(8px);
}
.site-header .wrap {
    display: flex; align-items: center; justify-content: space-between;
    padding: 14px 0;
}
.logo { font-weight: 700; font-size: 1.25rem; text-decoration: none; color: var(--text); }
.logo span { color: var(--accent); }
nav a {
    color: var(--muted); text-decoration: none; margin-left: 18px;
    padding: 4px 2px; border-bottom: 2px solid transparent;
}
nav a:hover, nav a.active { color: var(--text); border-color: var(--accent); }

main { padding: 48px 0 64px; }

.hero { text-align: center; padding: 32px 0 48px; }
.hero h1 { font-size: clamp(2rem, 5vw, 3rem); margin: 0 0 12px; }
.lead { color: var(--muted); font-size: 1.15rem; margin: 0 0 24px; }

.btn {
    display: inline-block; background: var(--accent); color: #fff;
    text-decoration: none; border: 0; cursor: pointer;
    padding: 12px 22px; border-radius: 10px; font-size: 1rem; font-weight: 600;
}
.btn:hover { filter: brightness(1.1); }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 18px; }
.card {
    background: var(--panel); border: 1px solid var(--border);
    border-radius: 14px; padding: 22px;
}
.card h2 { margin: 0 0 8px; font-size: 1.15rem; }
.card p { margin: 0; color: var(--muted); }

.page h1 { margin-top: 0; }
.page code { background: var(--panel); padding: 2px 6px; border-radius: 6px; }

.form { display: grid; gap: 16px; max-width: 480px; margin-top: 20px; }
.form label { display: grid; gap: 6px; font-size: .95rem; color: var(--muted); }
.form input, .form textarea {
    background: var(--panel); border: 1px solid var(--border); color: var(--text);
    padding: 10px 12px; border-radius: 10px; font: inherit; width: 100%;
}
.form input:focus, .form textarea:focus { outline: 2px solid var(--accent); border-color: transparent; }

.alert { border-radius: 10px; padding: 12px 16px; margin-bottom: 18px; }
.alert.ok { background: var(--ok-bg); color: var(--ok-fg); }
.alert.err { background: var(--err-bg); color: var(--err-fg); }
.alert ul { margin: 0; padding-left: 18px; }

.site-footer { border-top: 1px solid var(--border); padding: 20px 0; color: var(--muted); }
.site-footer p { margin: 0; font-size: .9rem; }