:root {
    --bg: #f5f6f8;
    --card: #ffffff;
    --text: #172033;
    --muted: #667085;
    --border: #dde3ec;
    --primary: #b00020;
    --primary-dark: #8b001a;
    --soft: #fff2f4;
    --warning: #9a5b00;
    --warning-bg: #fff4db;
    --danger: #b42318;
    --danger-bg: #fff1f0;
    --ok: #067647;
    --ok-bg: #ecfdf3;
    --info-bg: #eef4ff;
    --info: #3538cd;
    --shadow: 0 10px 30px rgba(16, 24, 40, .06);
    --radius: 18px;
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.45;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 14px 16px;
    background: rgba(255,255,255,.94);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(10px);
}
.brand { display: flex; align-items: baseline; gap: 10px; }
.brand a { color: var(--text); font-weight: 800; font-size: 1.08rem; text-decoration: none; }
.brand span { color: var(--muted); font-size: .88rem; }
.nav { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 2px; }
.nav a {
    white-space: nowrap;
    color: var(--text);
    background: #f0f2f5;
    border-radius: 999px;
    padding: 8px 11px;
    font-size: .9rem;
}
.nav a:hover { background: #e8ebf0; text-decoration: none; }

.container { width: min(1120px, 100%); margin: 0 auto; padding: 18px 14px 48px; }
.footer { color: var(--muted); font-size: .82rem; padding: 26px 14px; text-align: center; }

h1 { font-size: 1.55rem; line-height: 1.2; margin: 0 0 12px; }
h2 { font-size: 1.15rem; margin: 0 0 12px; }
h3 { font-size: 1rem; margin: 0 0 8px; }
p { margin: 0 0 12px; }
.small { color: var(--muted); font-size: .9rem; }
.muted { color: var(--muted); }
.danger-text { color: var(--danger); }

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow);
    margin-bottom: 14px;
}
.card.compact { padding: 12px; }
.grid { display: grid; gap: 14px; }
.grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }

.kpi {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px;
    box-shadow: var(--shadow);
}
.kpi strong { display: block; font-size: 1.7rem; line-height: 1.1; }
.kpi span { color: var(--muted); font-size: .9rem; }

.list { display: grid; gap: 10px; }
.item {
    display: block;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 12px;
}
.item:hover { text-decoration: none; border-color: #c7cfdb; }
.item-title { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; font-weight: 750; color: var(--text); }
.item-meta { color: var(--muted); font-size: .88rem; margin-top: 4px; }
.item-actions { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 8px; }

.badge {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    padding: 3px 8px;
    font-size: .78rem;
    font-weight: 700;
    border: 1px solid transparent;
}
.status-open { color: var(--info); background: var(--info-bg); }
.status-claimed { color: var(--warning); background: var(--warning-bg); }
.status-done { color: var(--ok); background: var(--ok-bg); }
.status-returned, .status-cancelled { color: var(--danger); background: var(--danger-bg); }
.badge-overdue { color: var(--danger); background: var(--danger-bg); }
.badge-soft { color: var(--primary); background: var(--soft); }

.flash {
    border-radius: 14px;
    padding: 12px 14px;
    margin-bottom: 14px;
    border: 1px solid var(--border);
    background: #fff;
}
.flash-success { background: var(--ok-bg); color: var(--ok); border-color: #abefc6; }
.flash-error { background: var(--danger-bg); color: var(--danger); border-color: #fecdca; }
.flash-info { background: var(--info-bg); color: var(--info); border-color: #c7d7fe; }

form { margin: 0; }
label { display: block; font-weight: 700; margin: 12px 0 6px; }
input[type="text"], input[type="email"], input[type="number"], textarea, select {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 11px 12px;
    font: inherit;
    background: #fff;
    color: var(--text);
}
textarea { min-height: 110px; resize: vertical; }
.checks { display: grid; gap: 8px; margin-top: 8px; }
.checks label { margin: 0; font-weight: 500; display: flex; gap: 8px; align-items: center; }
.form-row { display: grid; grid-template-columns: 1fr; gap: 10px; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }

button, .button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 0;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    padding: 10px 13px;
    font: inherit;
    font-weight: 750;
    cursor: pointer;
    text-decoration: none;
}
button:hover, .button:hover { background: var(--primary-dark); text-decoration: none; }
.button.secondary, button.secondary { background: #eef1f5; color: var(--text); }
.button.secondary:hover, button.secondary:hover { background: #e3e7ee; }
.button.danger, button.danger { background: var(--danger); color: #fff; }
.button.small, button.small { padding: 7px 10px; font-size: .88rem; border-radius: 10px; }
.inline-form { display: inline; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { color: var(--muted); font-size: .84rem; }

.notice {
    border: 1px solid #ffd6a8;
    background: #fff7ed;
    color: #7a3b00;
    border-radius: 14px;
    padding: 12px;
}
.codebox {
    width: 100%;
    min-height: 80px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: .86rem;
}

.timeline { display: grid; gap: 10px; }
.timeline-entry { border-left: 3px solid var(--border); padding-left: 12px; }
.timeline-entry strong { display: block; }

@media (min-width: 760px) {
    .topbar { flex-direction: row; align-items: center; justify-content: space-between; }
    .grid-2 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-4 { grid-template-columns: repeat(4, 1fr); }
    .form-row.two { grid-template-columns: 1fr 1fr; }
    .form-row.three { grid-template-columns: 1fr 1fr 1fr; }
}

.assignment-box {
    margin-top: 14px;
    padding: 14px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: #fbfcfe;
}
.assignment-head {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 8px;
}
.assignment-head h2 { margin-bottom: 4px; }
.assignment-fields { align-items: start; }
.field-hint {
    color: var(--muted);
    font-size: .82rem;
    margin: 6px 0 0;
}
.is-muted { opacity: .55; }
.help-tip {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: 999px;
    background: #eef1f5;
    color: var(--text);
    font-weight: 800;
    font-size: .86rem;
    cursor: help;
    vertical-align: middle;
    flex: 0 0 auto;
}
.help-tip.mini {
    width: 18px;
    height: 18px;
    font-size: .72rem;
    margin-left: 4px;
}
.help-tip:hover, .help-tip:focus {
    background: #e3e7ee;
    outline: 2px solid rgba(176, 0, 32, .16);
}
.help-popover {
    display: none;
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    z-index: 30;
    width: min(320px, calc(100vw - 36px));
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: #fff;
    color: var(--text);
    box-shadow: var(--shadow);
    font-weight: 500;
    font-size: .88rem;
    line-height: 1.35;
}
.help-tip:hover .help-popover, .help-tip:focus .help-popover, .help-tip:focus-within .help-popover {
    display: block;
}
@media (max-width: 759px) {
    .assignment-head { align-items: center; }
    .help-popover { right: -6px; }
}