:root {
    --bg: #f1f5f9;
    --card: #ffffff;
    --text: #0f172a;
    --muted: #475569;
    --border: #cbd5e1;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-soft: #dbeafe;
    --focus: #93c5fd;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0b1220;
        --card: #111a2e;
        --text: #e2e8f0;
        --muted: #94a3b8;
        --border: #334155;
        --accent: #3b82f6;
        --accent-hover: #60a5fa;
        --accent-soft: #1e3a8a;
        --focus: #1d4ed8;
    }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
    margin: 0;
    min-height: 100vh;
    padding: 32px 16px;
    background: var(--bg);
    color: var(--text);
    font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", sans-serif;
}

.card {
    max-width: 768px;
    margin: 0 auto;
    padding: 24px;
    background: var(--card);
    border-radius: 12px;
    box-shadow: 0 1px 3px rgb(0 0 0 / 0.08), 0 4px 16px rgb(0 0 0 / 0.04);
}

.header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.header img { width: 40px; height: 40px; flex: none; }

h1 { margin: 0; font-size: 1.6rem; line-height: 1.2; flex: 1; }

.github {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    font-size: 0.875rem;
    text-decoration: none;
    white-space: nowrap;
}

.github:hover { border-color: var(--muted); }
.github svg { width: 16px; height: 16px; fill: currentColor; }

.lead { margin: 0 0 20px; color: var(--muted); }

label { display: block; margin-bottom: 6px; font-weight: 600; }

textarea {
    display: block;
    width: 100%;
    min-height: 72px;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--card);
    color: var(--text);
    font: inherit;
    resize: vertical;
}

textarea:focus, button:focus-visible, a:focus-visible {
    outline: 3px solid var(--focus);
    outline-offset: 1px;
}

.btn {
    display: block;
    width: 100%;
    margin-top: 12px;
    padding: 10px;
    border: 0;
    border-radius: 8px;
    background: var(--accent);
    color: #fff;
    font: inherit;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s;
}

.btn:hover { background: var(--accent-hover); }

.btn-link {
    padding: 2px 8px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: transparent;
    color: var(--accent);
    font: inherit;
    font-size: 0.875rem;
    white-space: nowrap;
    cursor: pointer;
}

.btn-link:hover { border-color: var(--accent); }

.results { margin-top: 24px; }

.results-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
}

.status { margin: 0; color: var(--muted); font-size: 0.9rem; }

.groups {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 8px 24px;
}

.group-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    align-items: flex-start;
    gap: 8px;
    margin-top: 16px;
}

h2 { margin: 0; font-size: 1.15rem; }
h3 { margin: 0; font-size: 1.05rem; }

.group ul { margin: 8px 0 0; padding: 0; list-style: none; }
.group li { margin-bottom: 6px; }

.group a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--accent);
    text-decoration: none;
}

.group a:hover { text-decoration: underline; }

.g-icon { width: 16px; height: 16px; flex: none; }

.about {
    margin-top: 32px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    color: var(--muted);
    font-size: 0.95rem;
}

.about h2 { color: var(--text); margin-bottom: 8px; }
.about p { margin: 0 0 12px; }
.about ul { margin: 0 0 12px; padding-left: 20px; }

@media (max-width: 480px) {
    body { padding: 16px 12px; }
    .card { padding: 16px; }
    h1 { font-size: 1.35rem; }
}

[hidden] { display: none !important; }