:root {
    --bg: #f5f7fb;
    --surface: #ffffff;
    --text: #182033;
    --muted: #687184;
    --line: #e5e9f2;
    --primary: #123c7c;
    --primary-dark: #0b2a58;
    --danger: #b42318;
    --success: #067647;
    --warning: #b54708;
    --info: #175cd3;
    --shadow: 0 10px 30px rgba(18, 60, 124, 0.08);
}
* { box-sizing: border-box; }
body { margin: 0; font-family: Arial, Helvetica, sans-serif; background: var(--bg); color: var(--text); }
a { color: inherit; text-decoration: none; }
.topbar { position: sticky; top: 0; z-index: 10; background: var(--surface); border-bottom: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; padding: 12px 24px; box-shadow: var(--shadow); }
.brand { display: flex; gap: 12px; align-items: center; min-width: 250px; }
.brand-mark, .login-logo { width: 42px; height: 42px; border-radius: 12px; background: var(--primary); color: #fff; display: grid; place-items: center; font-weight: 800; font-size: 22px; }
.brand small { display: block; color: var(--muted); margin-top: 2px; }
nav { display: flex; flex-wrap: wrap; gap: 7px; align-items: center; justify-content: flex-end; }
nav a { padding: 9px 10px; border-radius: 10px; color: var(--muted); font-weight: 700; font-size: 13px; }
nav a:hover { background: #eef4ff; color: var(--primary); }
.danger-link { color: var(--danger) !important; }
.container { width: min(1280px, calc(100% - 28px)); margin: 20px auto 44px; }
.user-strip { background: #eef4ff; color: var(--primary-dark); padding: 10px 14px; border-radius: 12px; margin-bottom: 18px; display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.user-strip span { background: #fff; padding: 4px 8px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); }
.page-head { display: flex; justify-content: space-between; gap: 16px; align-items: center; margin: 8px 0 20px; }
h1 { margin: 0; font-size: 28px; }
h2 { margin: 24px 0 12px; font-size: 20px; }
h3 { margin: 10px 0 0; }
p { color: var(--muted); line-height: 1.5; }
.cards { display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px; margin-bottom: 12px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 18px; box-shadow: var(--shadow); }
.card small { color: var(--muted); display: block; margin-bottom: 9px; }
.card strong { font-size: 23px; }
.card .sub { display:block; color:var(--muted); font-size:12px; margin-top:6px; }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 20px; box-shadow: var(--shadow); margin-bottom: 18px; }
.small-panel { max-width: 600px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; align-items: start; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; align-items: start; }
.table-wrap { width: 100%; overflow: auto; }
.table-wrap.wide { max-height: 650px; }
table { width: 100%; border-collapse: collapse; min-width: 760px; }
th, td { text-align: left; padding: 12px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-size: 13px; background: #f8fafc; position: sticky; top: 0; }
tr:hover td { background: #fbfdff; }
label { display: block; color: var(--muted); font-weight: 700; margin-bottom: 7px; font-size: 13px; }
input, select, textarea { width: 100%; border: 1px solid var(--line); border-radius: 12px; padding: 11px 12px; font: inherit; background: #fff; color: var(--text); }
textarea { resize: vertical; }
input:focus, select:focus, textarea:focus { outline: 2px solid #d8e8ff; border-color: var(--primary); }
.form-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.stack-form { display: grid; gap: 12px; }
.span-all { grid-column: 1 / -1; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; align-items:center; }
.btn { display: inline-flex; align-items: center; justify-content: center; border: 0; border-radius: 12px; background: var(--primary); color: #fff; padding: 11px 16px; font-weight: 800; cursor: pointer; font-size: 14px; }
.btn:hover { background: var(--primary-dark); }
.btn.ghost { background: #eef4ff; color: var(--primary); }
.btn.light { background: #fff; color: var(--primary); border: 1px solid var(--line); }
.btn.danger { background: var(--danger); }
.btn.full { width: 100%; margin-top: 12px; }
.alert { border-radius: 14px; padding: 12px 14px; margin-bottom: 14px; font-weight: 700; }
.alert.success { background: #ecfdf3; color: var(--success); border: 1px solid #abefc6; }
.alert.error { background: #fef3f2; color: var(--danger); border: 1px solid #fecdca; }
.alert.warning { background: #fffaeb; color: var(--warning); border: 1px solid #fedf89; }
.pill { border-radius: 999px; padding: 5px 10px; background: #eef4ff; color: var(--primary); font-size: 12px; font-weight: 800; display:inline-flex; }
.pill.success { background:#ecfdf3; color:var(--success); }
.pill.danger { background:#fef3f2; color:var(--danger); }
.pill.warning { background:#fffaeb; color:var(--warning); }
.pill.info { background:#eef4ff; color:var(--info); }
.temp-hot { background:#fef3f2; color:#b42318; }
.temp-warm { background:#fffaeb; color:#b54708; }
.temp-cold { background:#f0f9ff; color:#026aa2; }
.muted { color: var(--muted); }
.check-line { display: flex; align-items: center; gap: 8px; color: var(--text); }
.check-line input { width: auto; }
.login-options { display: grid; gap: 10px; background: #f8fafc; border: 1px dashed var(--line); padding: 14px; border-radius: 14px; }
.filter-row { display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px; align-items: end; }
.filter-actions { display: flex; gap: 8px; align-items: center; }
.course-list { display: grid; gap: 10px; }
.course-item { border: 1px solid var(--line); border-radius: 14px; padding: 13px; background: #fbfdff; }
.course-item summary { cursor: pointer; font-weight: 800; display: flex; justify-content: space-between; gap: 10px; }
.course-item span { color: var(--muted); font-weight: 600; }
pre { white-space: pre-wrap; font-family: inherit; color: var(--muted); background: #fff; padding: 12px; border-radius: 12px; border: 1px solid var(--line); }
.timeline { display:grid; gap:12px; }
.timeline-item { border-left:4px solid #d8e8ff; padding:12px 14px; background:#fbfdff; border-radius:12px; }
.timeline-item strong { display:block; margin-bottom:4px; }
.timeline-item small { color:var(--muted); }
.message-box { min-height: 260px; font-family: Arial, Helvetica, sans-serif; }
.footer { text-align: center; color: var(--muted); padding: 24px; }
.login-body { min-height: 100vh; display: grid; place-items: center; background: linear-gradient(135deg, #f5f7fb, #e9f2ff); }
.login-card { width: min(420px, calc(100% - 28px)); background: var(--surface); border-radius: 24px; box-shadow: var(--shadow); border: 1px solid var(--line); padding: 30px; }
.login-card h1 { margin-top: 14px; font-size: 26px; }
.login-card p { margin-top: 8px; }
.login-card label { margin-top: 14px; }
@media (max-width: 1100px) {
    .cards { grid-template-columns: repeat(3, 1fr); }
    .grid-2, .grid-3 { grid-template-columns: 1fr; }
    .form-grid { grid-template-columns: repeat(2, 1fr); }
    .filter-row { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
    .topbar { align-items: flex-start; flex-direction: column; }
    nav { width: 100%; justify-content:flex-start; }
    nav a { background: #f8fafc; }
    .page-head { align-items: flex-start; flex-direction: column; }
    .cards { grid-template-columns: 1fr; }
    .form-grid, .filter-row { grid-template-columns: 1fr; }
}