:root {
    --navy: #0f2a4a;
    --blue: #1c7ed6;
    --blue-dark: #1864ab;
    --bg: #f2f5fa;
    --card: #ffffff;
    --line: #dde3ee;
    --text: #1b2433;
    --muted: #64708a;
    --ok: #2b8a3e;
    --ok-bg: #e6f6ea;
    --warn: #b06a00;
    --warn-bg: #fff3d6;
    --off: #6b7280;
    --off-bg: #eceef2;
    --err: #c92a2a;
    --err-bg: #fdeaea;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}

.wrap { max-width: 980px; margin: 0 auto; padding: 0 20px; }

.top { background: var(--navy); color: #fff; }
.top .wrap { display: flex; align-items: center; justify-content: space-between; min-height: 56px; gap: 16px; flex-wrap: wrap; }
.brand { color: #fff; font-weight: 700; font-size: 1.1rem; text-decoration: none; letter-spacing: .2px; }
.top nav { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.top nav a, .top nav button.link { color: #cfe0f5; text-decoration: none; font-size: .95rem; }
.top nav a:hover, .top nav button.link:hover { color: #fff; }

main { padding-top: 24px; padding-bottom: 40px; }
h1 { margin: 0 0 4px; font-size: 1.6rem; }
h2 { margin: 24px 0 8px; font-size: 1.15rem; }
h2:first-child { margin-top: 0; }
h3 { margin: 18px 0 6px; font-size: 1rem; color: var(--muted); }
a { color: var(--blue); }
.muted { color: var(--muted); font-size: .92rem; }
.foot { padding-bottom: 30px; color: var(--muted); font-size: .85rem; }

.card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 20px;
    margin: 16px 0;
}
.card.narrow { max-width: 420px; margin: 40px auto; }
.card.highlight { border-color: var(--blue); background: #f0f7ff; }

.codebox {
    font: 700 1.5rem/1.2 ui-monospace, "Cascadia Mono", Consolas, monospace;
    letter-spacing: 2px;
    background: #fff;
    border: 1px dashed var(--blue);
    border-radius: 8px;
    padding: 12px 16px;
    display: inline-block;
    user-select: all;
    word-break: break-all;
}

label { display: block; margin: 10px 0; font-size: .92rem; color: var(--muted); }
input[type=text], input[type=email], input[type=password], input[type=number], input[type=file] {
    display: block; width: 100%; margin-top: 4px; padding: 9px 11px;
    font: inherit; color: var(--text); background: #fff;
    border: 1px solid #c5cdda; border-radius: 7px;
}
input:focus { outline: 2px solid #a5d0ff; border-color: var(--blue); }

.row { display: flex; gap: 16px; align-items: flex-end; flex-wrap: wrap; margin: 12px 0; }
.row > label { flex: 1 1 160px; margin: 0; }
.row > .grow { flex: 2 1 240px; }
.row > p.grow { margin: 0; }

.btn {
    display: inline-block; cursor: pointer; text-decoration: none;
    background: var(--blue); color: #fff; border: 0; border-radius: 7px;
    padding: 10px 18px; font: inherit; font-weight: 600;
}
.btn:hover { background: var(--blue-dark); }
.btn.secondary { background: #e6ecf5; color: var(--navy); }
.btn.secondary:hover { background: #d5deec; }
.btn.danger { background: #fff; color: var(--err); border: 1px solid #efb3b3; }
.btn.danger:hover { background: var(--err-bg); }
.btn.small { padding: 5px 11px; font-size: .85rem; }

button.link { background: none; border: 0; padding: 0; cursor: pointer; font: inherit; color: var(--blue); }
form.inline { display: inline; margin: 0; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: .8rem; text-transform: uppercase; letter-spacing: .5px; color: var(--muted); }
table.kv th { width: 180px; text-transform: none; letter-spacing: 0; font-size: .92rem; }

.badge { display: inline-block; padding: 2px 10px; border-radius: 99px; font-size: .82rem; font-weight: 600; }
.badge.ok { color: var(--ok); background: var(--ok-bg); }
.badge.warn { color: var(--warn); background: var(--warn-bg); }
.badge.off { color: var(--off); background: var(--off-bg); }

.flash { padding: 11px 14px; border-radius: 8px; margin: 12px 0; font-size: .95rem; }
.flash.ok { color: var(--ok); background: var(--ok-bg); }
.flash.err { color: var(--err); background: var(--err-bg); }

.checks { display: flex; flex-wrap: wrap; gap: 8px 22px; margin: 10px 0; }
.check { display: flex; align-items: center; gap: 8px; margin: 0; color: var(--text); font-size: 1rem; }
.check input { width: 18px; height: 18px; }

.thumbs { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 14px; margin: 10px 0; }
.thumb { display: flex; flex-direction: column; gap: 6px; margin: 0; padding: 8px; border: 1px solid var(--line); border-radius: 8px; background: #fafbfd; font-size: .8rem; color: var(--muted); position: relative; }
.thumb img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; border-radius: 5px; background: #dfe5ef; }
.thumb input[type=checkbox] { position: absolute; top: 14px; left: 14px; width: 20px; height: 20px; }
.thumb:has(input:checked) { border-color: var(--blue); background: #eef6ff; }

@media (max-width: 600px) {
    .card { padding: 14px; }
    th, td { padding: 8px 4px; }
}