:root {
    --bg: #f4f6f8;
    --card: #ffffff;
    --ink: #1c2733;
    --muted: #5c6b7a;
    --line: #dde3e9;
    --accent: #0a6cba;
    --accent-dark: #08568f;
    --ok: #1f8a4c;
    --ok-bg: #e6f4ec;
    --warn: #b8860b;
    --warn-bg: #fcf4e0;
    --err: #c0392b;
    --err-bg: #fbeae8;
    --radius: 12px;
    --shadow: 0 1px 3px rgba(16, 35, 54, .08), 0 4px 16px rgba(16, 35, 54, .06);
}

* { box-sizing: border-box; }

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

body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--ink);
    background: var(--bg);
    line-height: 1.5;
}

.container {
    width: 100%;
    max-width: 640px;
    margin: 0 auto;
    padding: 16px;
}

.container--wide { max-width: 1040px; }

/* Topbar */
.topbar {
    background: var(--accent);
    color: #fff;
    padding: 12px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}
.topbar a { color: #fff; text-decoration: none; }
.topbar__brand { font-weight: 700; font-size: 1.05rem; }
.topbar__nav { display: flex; gap: 14px; align-items: center; font-size: .92rem; }

/* Cards */
.card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    margin-bottom: 16px;
}

h1 { font-size: 1.5rem; margin: .2em 0 .4em; }
h2 { font-size: 1.2rem; margin: 1em 0 .4em; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.center { text-align: center; }

/* Forms */
label { display: block; font-weight: 600; margin: 14px 0 6px; font-size: .95rem; }
.hint { font-weight: 400; color: var(--muted); font-size: .82rem; margin: 2px 0 0; }

input[type=text], input[type=email], input[type=date], input[type=number],
input[type=password], input[type=datetime-local], select, textarea {
    width: 100%;
    padding: 12px 14px;
    font-size: 1rem;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: #fff;
    color: var(--ink);
}
input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(10, 108, 186, .15);
}
textarea { min-height: 110px; resize: vertical; }

.radio-row, .check-row { display: flex; align-items: flex-start; gap: 10px; margin: 10px 0; font-weight: 400; }
.radio-row label, .check-row label { margin: 0; font-weight: 400; }
.radio-group { display: flex; gap: 18px; flex-wrap: wrap; }
.radio-group .radio-row { margin: 6px 0; }
input[type=checkbox], input[type=radio] { width: 20px; height: 20px; margin-top: 2px; flex: none; }

/* Buttons */
.btn {
    display: inline-block;
    border: none;
    border-radius: 10px;
    padding: 13px 20px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    background: var(--accent);
    color: #fff;
}
.btn:hover { background: var(--accent-dark); }
.btn:disabled { background: #9fb4c4; cursor: not-allowed; }
.btn--block { display: block; width: 100%; }
.btn--ghost { background: #fff; color: var(--accent); border: 1px solid var(--line); }
.btn--ghost:hover { background: #f0f5fa; }
.btn--danger { background: var(--err); }
.btn--danger:hover { background: #9c2b20; }
.btn--ok { background: var(--ok); }
.btn--sm { padding: 8px 12px; font-size: .88rem; }

/* Alerts */
.alert { border-radius: 10px; padding: 12px 14px; margin: 12px 0; font-size: .95rem; }
.alert--ok { background: var(--ok-bg); color: var(--ok); }
.alert--warn { background: var(--warn-bg); color: var(--warn); }
.alert--err { background: var(--err-bg); color: var(--err); }
.field-error { color: var(--err); font-size: .82rem; margin-top: 4px; }

/* Tables */
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-size: .8rem; text-transform: uppercase; letter-spacing: .03em; }
.table-wrap { overflow-x: auto; }

/* Badges */
.badge { display: inline-block; padding: 3px 9px; border-radius: 999px; font-size: .78rem; font-weight: 600; }
.badge--ok { background: var(--ok-bg); color: var(--ok); }
.badge--muted { background: #eef1f4; color: var(--muted); }
.badge--warn { background: var(--warn-bg); color: var(--warn); }

/* Big number (start number / confirmation) */
.bignum {
    font-size: 3.2rem;
    font-weight: 800;
    color: var(--accent);
    letter-spacing: .04em;
    line-height: 1.1;
}
.qr { display: block; margin: 16px auto; width: 220px; height: 220px; image-rendering: pixelated; }

.grid-2 { display: grid; grid-template-columns: 1fr; gap: 14px; }
@media (min-width: 560px) {
    .grid-2 { grid-template-columns: 1fr 1fr; }
}

.stack > * + * { margin-top: 10px; }
.row-between { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.dl { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; }
.dl dt { color: var(--muted); }
.dl dd { margin: 0; }