:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --line: #d8dfeb;
  --text: #1f2a3d;
  --muted: #6d7a91;
  --primary: #2359d1;
  --ok: #e9f7ef;
  --ok-text: #146c2e;
  --tight: #fff4d8;
  --tight-text: #8a5d00;
  --over: #fde6e7;
  --over-text: #a11f2b;
  --cut-none: #ebf8ef;
  --cut-light: #fff3cd;
  --cut-heavy: #f8d7da;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: Arial, Helvetica, sans-serif; background: var(--bg); color: var(--text); }
a { color: var(--primary); text-decoration: none; }
.app-shell { display: grid; grid-template-columns: 240px 1fr; min-height: 100vh; }
.sidebar { background: #182338; color: #fff; padding: 18px; }
.brand { font-size: 22px; font-weight: 700; margin-bottom: 20px; }
.sidebar nav { display: grid; gap: 8px; }
.sidebar nav a { color: #d9e3f8; padding: 10px 12px; border-radius: 10px; }
.sidebar nav a.active, .sidebar nav a:hover { background: rgba(255,255,255,.12); }
.main-content { padding: 20px; }
.topbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; gap: 16px; }
.topbar-title { font-size: 26px; font-weight: 700; }
.userbox { display: flex; gap: 12px; align-items: center; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: 16px; box-shadow: 0 2px 8px rgba(31,42,61,0.04); }
.grid { display: grid; gap: 16px; }
.grid.cols-2 { grid-template-columns: 1fr 1fr; }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
.kpi { padding: 16px; background: var(--panel); border: 1px solid var(--line); border-radius: 16px; }
.kpi .label { color: var(--muted); font-size: 13px; }
.kpi .value { font-size: 28px; font-weight: 700; margin-top: 6px; }
.table-wrap { overflow: auto; }
table { width: 100%; border-collapse: collapse; background: var(--panel); }
th, td { border-bottom: 1px solid var(--line); padding: 10px; text-align: left; vertical-align: top; }
th { background: #f0f4fb; position: sticky; top: 0; }
form.inline, .inline-form { display: flex; gap: 8px; align-items: end; flex-wrap: wrap; }
input, select, textarea { width: 100%; padding: 9px 10px; border-radius: 10px; border: 1px solid #bfc9da; background: white; }
textarea { min-height: 90px; }
label { display: grid; gap: 6px; font-size: 14px; color: var(--muted); }
.button { display: inline-block; background: var(--primary); color: white; border: none; border-radius: 10px; padding: 10px 14px; cursor: pointer; }
.button.secondary { background: #e7edf9; color: #17325f; }
.button.small { padding: 6px 10px; font-size: 12px; }
.alert { padding: 12px 14px; border-radius: 12px; margin-bottom: 14px; }
.alert.success { background: var(--ok); color: var(--ok-text); }
.alert.error { background: var(--over); color: var(--over-text); }
.stack { display: grid; gap: 12px; }
.login-body { display: grid; place-items: center; min-height: 100vh; }
.login-box { width: min(420px, calc(100vw - 24px)); background: white; border: 1px solid var(--line); border-radius: 18px; padding: 28px; box-shadow: 0 12px 28px rgba(0,0,0,.08); }
.muted { color: var(--muted); }
.status-ok { background: var(--ok); color: var(--ok-text); }
.status-tight { background: var(--tight); color: var(--tight-text); }
.status-over { background: var(--over); color: var(--over-text); }
.badge { display: inline-block; padding: 5px 9px; border-radius: 999px; font-size: 12px; font-weight: 700; }
.cut-none { background: var(--cut-none); }
.cut-light { background: var(--cut-light); }
.cut-heavy { background: var(--cut-heavy); }
.planning-layout { display: grid; grid-template-columns: minmax(0, 1fr) 360px; gap: 16px; align-items: start; }
.grade-block { background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: 12px; margin-bottom: 16px; }
.grade-header { display: flex; justify-content: space-between; gap: 12px; align-items: center; flex-wrap: wrap; margin-bottom: 12px; }
.grade-controls { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.class-block { border: 1px solid var(--line); border-radius: 14px; margin: 12px 0; overflow: hidden; }
.class-title { padding: 10px 12px; background: #eef3fb; font-weight: 700; }
.subject-row { display: grid; grid-template-columns: 120px 80px 130px 1fr 1fr auto; gap: 8px; padding: 8px 12px; border-top: 1px solid var(--line); align-items: center; }
.subject-row .teacher-wrap { display: flex; gap: 8px; align-items: center; }
.hour-control { display: flex; gap: 6px; align-items: center; }
.hour-value { min-width: 36px; text-align: center; font-weight: 700; }
.panel-title { margin: 0 0 10px; font-size: 18px; }
.small-text { font-size: 12px; color: var(--muted); }
.center { text-align: center; }
.teacher-code.invalid { border-color: #cb2834; background: #fff2f3; }
@media (max-width: 1200px) { .planning-layout { grid-template-columns: 1fr; } }
@media (max-width: 900px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { position: sticky; top: 0; z-index: 20; }
  .grid.cols-2, .grid.cols-3, .grid.cols-4 { grid-template-columns: 1fr; }
  .subject-row { grid-template-columns: 1fr; }
}
@media print {
  .sidebar, .topbar, .no-print, .button, form { display: none !important; }
  .app-shell { display: block; }
  body { background: white; }
  .main-content, .card, .grade-block { padding: 0; border: none; box-shadow: none; }
}