:root {
    --bg: #f5f6fa;
    --card: #ffffff;
    --text: #1d2233;
    --muted: #6b7185;
    --line: #e3e6ef;
    /* From the IPK logo: deep blue, with the aqua of the "K" as accent. */
    --brand: #1f5fbf;
    --brand-dark: #173f8a;
    --accent: #1fb7c9;
    --danger: #c0392b;
    --ok: #1e8e5a;
    --radius: 10px;
}

* { box-sizing: border-box; }
body { margin: 0; font-family: "Segoe UI", system-ui, sans-serif; background: var(--bg); color: var(--text); font-size: 15px; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 24px; margin: 0 0 16px; }
h2 { font-size: 17px; margin: 0 0 12px; }
h3 { font-size: 15px; margin: 18px 0 8px; }
code { background: #eef0f7; padding: 1px 5px; border-radius: 4px; }

.topbar { display: flex; align-items: center; gap: 24px; padding: 0 24px; height: 56px; background: #0f1d3a; color: #fff; border-bottom: 3px solid var(--accent); }
.brand { color: #fff; font-size: 17px; white-space: nowrap; }
.brand:hover { text-decoration: none; }
.logo { color: #8b84ff; }
.brand { display: inline-flex; align-items: center; gap: 8px; }
.brand-mark { height: 30px; width: auto; background: #fff; border-radius: 6px; padding: 3px 5px; }
.topbar nav { display: flex; gap: 4px; flex: 1; overflow-x: auto; }
.topbar nav a { color: #c7cbe0; padding: 8px 12px; border-radius: 6px; }
.topbar nav a.active, .topbar nav a:hover { background: #262d48; color: #fff; text-decoration: none; }
.who { display: flex; align-items: center; gap: 10px; margin-left: auto; color: #c7cbe0; font-size: 13px; }
button.link { background: none; border: 0; color: var(--accent); cursor: pointer; font: inherit; }

.page { max-width: 1200px; margin: 0 auto; padding: 24px 16px 60px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; margin-bottom: 18px; }
.card.narrow { max-width: 440px; margin: 40px auto; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.grid2 > .card { margin-bottom: 0; }
.grid2 + .card { margin-top: 18px; }
.head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; margin-bottom: 8px; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.nowrap { white-space: nowrap; }

.form { display: flex; flex-direction: column; gap: 12px; }
.form.row { flex-direction: row; flex-wrap: wrap; align-items: flex-end; }
.row { display: flex; gap: 12px; flex-wrap: wrap; }
.grow { flex: 1; min-width: 180px; }
label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
label.check { flex-direction: row; align-items: center; gap: 8px; color: var(--text); font-size: 14px; }
input, select, textarea { font: inherit; padding: 8px 10px; border: 1px solid var(--line); border-radius: 6px; background: #fff; color: var(--text); }
input:focus, select:focus, textarea:focus { outline: 2px solid #bcd6ff; border-color: var(--brand); }
input[type=checkbox] { width: 16px; height: 16px; }

.btn { display: inline-block; font: inherit; font-size: 14px; padding: 8px 16px; border-radius: 6px; border: 1px solid var(--line); background: #fff; color: var(--text); cursor: pointer; white-space: nowrap; }
.btn:hover { background: #f0f1f7; text-decoration: none; }
.btn.primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn.primary:hover { background: var(--brand-dark); }
.btn.danger { color: var(--danger); border-color: #f0c8c3; }
.btn.danger:hover { background: #fdf0ee; }
.btn.small { padding: 4px 10px; font-size: 13px; }

.flash { padding: 10px 14px; border-radius: 8px; margin-bottom: 16px; }
.flash.ok { background: #e6f6ee; color: #155f3d; }
.flash.err { background: #fdecea; color: #8e2a1e; }
.flash.err ul { margin: 0; padding-left: 18px; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th { text-align: left; font-weight: 600; color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .03em; padding: 8px; border-bottom: 1px solid var(--line); }
td { padding: 10px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
tr.dim td { opacity: .55; }
tr.warn td { background: #fffaf3; }
.tag { display: inline-block; font-size: 12px; padding: 2px 8px; border-radius: 999px; background: #eef0f7; color: var(--muted); }
.tag.red { background: #fdecea; color: var(--danger); }
.tag.green { background: #e6f6ee; color: var(--ok); }
.tag.amber { background: #fff3dc; color: #9a5b00; }
.plan-banner { padding: 10px 14px; border-radius: 8px; margin-bottom: 16px; background: #fff3dc; color: #7a4b00; }
.plan-banner.bad { background: #fdecea; color: #8e2a1e; }

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 14px; margin-bottom: 18px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; color: var(--muted); font-size: 13px; }
.stat span { display: block; font-size: 28px; font-weight: 600; color: var(--text); }
.stat:hover { text-decoration: none; border-color: var(--brand); }
.stat.warn span { color: var(--danger); }
.steps li { margin-bottom: 6px; }

.keybox { border-color: var(--brand); background: #eef5ff; }
.key { font-family: Consolas, monospace; font-size: 26px; letter-spacing: 2px; margin: 8px 0; user-select: all; }
.danger-zone { border-color: #f0c8c3; }
.danger-zone form { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.pager { display: flex; gap: 8px; margin-top: 12px; }

/* Reader */
.library { display: flex; flex-direction: column; gap: 10px; }
.book { display: flex; gap: 14px; align-items: center; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; }
.cover { width: 44px; height: 56px; border-radius: 4px; background: linear-gradient(135deg, #1f5fbf, #1fb7c9); color: #fff; font-size: 11px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.book p { margin: 2px 0 0; }
.viewer-bar { position: sticky; top: 0; z-index: 2; display: flex; gap: 16px; align-items: center; background: var(--bg); padding: 10px 0; }
.viewer { display: flex; flex-direction: column; align-items: center; gap: 16px; user-select: none; -webkit-user-select: none; }
.viewer.blurred { filter: blur(24px); }
.sheet { width: 100%; max-width: 900px; min-height: 1100px; background: #fff; box-shadow: 0 1px 4px rgba(0,0,0,.12); display: flex; align-items: center; justify-content: center; }
.sheet img { width: 100%; height: auto; display: block; pointer-events: none; }
.shield { position: fixed; inset: 0; z-index: 10; display: flex; align-items: center; justify-content: center; background: rgba(21,26,45,.85); color: #fff; font-size: 18px; cursor: pointer; }
.shield[hidden] { display: none; }

@media print {
    body.reader-body * { display: none !important; }
}

@media (max-width: 800px) {
    .grid2 { grid-template-columns: 1fr; }
    .topbar { padding: 0 16px; gap: 12px; }
    .who span { display: none; }
    .sheet { min-height: 400px; }
}