:root {
    --bg: #f4f7fb;
    --card: #ffffff;
    --text: #162033;
    --muted: #64748b;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --border: #e2e8f0;
    --danger: #dc2626;
    --warning: #92400e;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: var(--bg);
    color: var(--text);
}
.page { max-width: 1120px; margin: 0 auto; padding: 24px; }
.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}
.topbar h1 { margin: 0; font-size: 28px; }
.topbar p { margin: 6px 0 0; color: var(--muted); }
.topbar nav { display: flex; gap: 12px; flex-wrap: wrap; }
a { color: var(--primary); text-decoration: none; font-weight: 700; }
.grid { display: grid; grid-template-columns: 1.3fr 0.7fr; gap: 20px; }
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: 0 12px 35px rgba(15, 23, 42, 0.08);
    padding: 24px;
}
.card h2 { margin-top: 0; }
.narrow { max-width: 460px; margin: 40px auto; }
.muted { color: var(--muted); }
.form { display: flex; flex-direction: column; gap: 12px; }
.form label { font-weight: 700; }
input[type="file"], input[type="text"], input[type="email"], input[type="password"] {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 13px 14px;
    font-size: 15px;
    outline: none;
}
input:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(37,99,235,.12); }
.checkbox { display: flex; align-items: flex-start; gap: 10px; padding: 12px; background: #f8fafc; border-radius: 12px; }
.checkbox input { margin-top: 4px; }
small { color: var(--muted); line-height: 1.5; }
.warning { color: var(--warning); }
button {
    border: 0;
    background: var(--primary);
    color: #fff;
    padding: 14px 18px;
    border-radius: 14px;
    font-weight: 800;
    cursor: pointer;
    font-size: 16px;
}
button:hover { background: var(--primary-dark); }
.info ul { margin: 0; padding-left: 20px; line-height: 1.9; }
.messages { margin-bottom: 18px; }
.alert { padding: 12px 14px; border-radius: 12px; background: #e0f2fe; color: #075985; }
.alert.error { background: #fee2e2; color: var(--danger); }
.stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin-top: 18px; }
.stats div { background: #f8fafc; border: 1px solid var(--border); border-radius: 14px; padding: 16px; }
.stats strong { display: block; font-size: 24px; }
.stats span { display: block; color: var(--muted); margin-top: 4px; }
.downloads { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.downloads a { border: 1px solid var(--border); border-radius: 12px; padding: 12px; background: #f8fafc; overflow-wrap: anywhere; }
@media (max-width: 800px) {
    .page { padding: 16px; }
    .topbar { flex-direction: column; align-items: flex-start; }
    .grid { grid-template-columns: 1fr; }
    .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .downloads { grid-template-columns: 1fr; }
}