:root {
  color-scheme: dark;
  --bg:#0b1118;
  --surface:#111a24;
  --card:#17222e;
  --card-2:#1b2937;
  --border:#2a3a49;
  --text:#edf3f7;
  --muted:#94a7b7;
  --accent:#f0c040;
  --blue:#5bc0eb;
  --green:#73d39b;
  --orange:#f2a65a;
  --red:#ef767a;
  --purple:#ad8df0;
  --shadow:0 20px 60px rgba(0,0,0,.28);
}

* { box-sizing:border-box; }
[hidden] { display:none !important; }
html { min-height:100%; background:var(--bg); }
body { margin:0; min-height:100vh; color:var(--text); background:radial-gradient(circle at 75% -20%, #20384a 0, transparent 36%), var(--bg); font:14px/1.5 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
button, input, select, textarea { font:inherit; }
button, select { cursor:pointer; }
button { border:0; border-radius:8px; padding:10px 15px; background:var(--accent); color:#15120a; font-weight:750; }
button:hover { filter:brightness(1.07); }
button:disabled { cursor:not-allowed; opacity:.45; filter:none; }
button.secondary { background:transparent; color:var(--text); border:1px solid var(--border); }
button.warning { background:var(--orange); color:#251508; }
button.danger { background:var(--red); color:#25090a; }
button.text-button { padding:0; background:none; color:var(--muted); text-align:left; }
a { color:var(--blue); }
h1, h2, h3, p { margin-top:0; }
h1 { margin-bottom:6px; font-size:clamp(26px,3vw,38px); letter-spacing:-.035em; }
h2 { margin-bottom:0; font-size:25px; letter-spacing:-.025em; }
h3 { margin-bottom:8px; font-size:15px; letter-spacing:.01em; }
p { color:var(--muted); }
label { display:block; margin-bottom:6px; color:var(--muted); font-size:12px; font-weight:750; letter-spacing:.035em; }
input, select, textarea { width:100%; border:1px solid var(--border); border-radius:8px; outline:0; padding:11px 12px; background:#0c141d; color:var(--text); }
input:focus, select:focus, textarea:focus { border-color:var(--blue); box-shadow:0 0 0 3px rgba(91,192,235,.12); }
textarea { resize:vertical; }
.eyebrow { margin-bottom:8px; color:var(--accent); font-size:10px; font-weight:850; letter-spacing:.18em; text-transform:uppercase; }
.login-shell { display:grid; min-height:100vh; place-items:center; padding:24px; }
.login-card { width:min(440px,100%); padding:42px; border:1px solid var(--border); border-radius:16px; background:rgba(17,26,36,.96); box-shadow:var(--shadow); }
.login-card form { display:grid; gap:10px; margin:28px 0 16px; }
.login-card form button { margin-top:6px; }
.student-link { display:inline-block; margin-top:24px; color:var(--muted); text-decoration:none; }
.form-message { min-height:22px; color:var(--red); font-size:13px; }
.app-shell { min-height:100vh; }
.sidebar { position:fixed; inset:0 auto 0 0; z-index:2; display:flex; width:244px; flex-direction:column; border-right:1px solid var(--border); background:rgba(12,19,27,.97); }
.brand { display:flex; align-items:center; gap:11px; padding:24px 20px; color:var(--text); font-weight:800; text-decoration:none; }
.brand small { display:block; color:var(--muted); font-size:10px; font-weight:650; letter-spacing:.08em; text-transform:uppercase; }
.brand-mark { display:grid; width:38px; height:38px; flex:0 0 auto; place-items:center; border-radius:10px; background:var(--accent); color:#191409; font-size:20px; }
.sidebar nav { display:grid; gap:4px; padding:16px 12px; }
.nav-button { padding:11px 12px; background:transparent; color:var(--muted); text-align:left; }
.nav-button:hover, .nav-button.active { background:var(--card); color:var(--text); filter:none; }
.nav-button.active { box-shadow:inset 3px 0 var(--accent); }
.sidebar-footer { display:grid; gap:10px; margin-top:auto; padding:20px; border-top:1px solid var(--border); color:var(--muted); font-size:12px; }
.sidebar-footer a { color:var(--muted); text-decoration:none; }
.dashboard-main { margin-left:244px; padding:34px clamp(22px,4vw,58px) 70px; }
.topbar { display:flex; align-items:flex-start; justify-content:space-between; gap:24px; margin:0 auto 34px; max-width:1480px; }
.topbar p { margin-bottom:0; }
.top-actions { display:flex; flex-wrap:wrap; justify-content:flex-end; gap:8px; }
.global-message { position:sticky; top:12px; z-index:4; max-width:1480px; margin:0 auto 20px; padding:12px 15px; border:1px solid rgba(115,211,155,.45); border-radius:8px; background:#142a25; color:var(--green); box-shadow:var(--shadow); }
.global-message.error { border-color:rgba(239,118,122,.5); background:#32191d; color:#ffb1b4; }
.panel { display:none; max-width:1480px; margin:auto; }
.panel.active { display:block; }
.section-heading { display:flex; align-items:flex-end; justify-content:space-between; gap:20px; margin-bottom:19px; }
.data-note { max-width:520px; color:var(--muted); font-size:12px; text-align:right; }
.summary-grid { display:grid; grid-template-columns:repeat(6,minmax(130px,1fr)); gap:12px; margin-bottom:16px; }
.summary-card, .card { border:1px solid var(--border); border-radius:12px; background:linear-gradient(145deg,rgba(27,41,55,.96),rgba(19,30,40,.96)); box-shadow:0 8px 30px rgba(0,0,0,.12); }
.summary-card { min-height:126px; padding:18px; }
.summary-value { margin:7px 0 3px; font-size:28px; font-weight:850; letter-spacing:-.045em; }
.summary-label { color:var(--muted); font-size:11px; font-weight:750; letter-spacing:.07em; text-transform:uppercase; }
.summary-sub { color:var(--muted); font-size:11px; }
.card { padding:20px; }
.two-column { display:grid; grid-template-columns:1fr 1fr; gap:16px; margin-bottom:16px; }
.two-column.wide-left { grid-template-columns:minmax(0,1.5fr) minmax(300px,.8fr); }
.three-column { display:grid; grid-template-columns:repeat(3,1fr); gap:16px; }
.current-card { overflow:hidden; position:relative; }
.current-card::after { position:absolute; content:""; right:-40px; bottom:-70px; width:180px; height:180px; border-radius:50%; background:rgba(240,192,64,.08); }
.current-number { color:var(--accent); font-size:12px; font-weight:800; letter-spacing:.1em; text-transform:uppercase; }
.current-title { margin:5px 0 8px; font-size:24px; font-weight:820; }
.mastery-progress, .mini-progress { overflow:hidden; border:0; border-radius:99px; appearance:none; background:#0a1118; }
.mastery-progress { width:100%; height:8px; }
.mini-progress { width:76px; height:6px; }
.mastery-progress::-webkit-progress-bar, .mini-progress::-webkit-progress-bar { border-radius:99px; background:#0a1118; }
.mastery-progress::-webkit-progress-value, .mini-progress::-webkit-progress-value { border-radius:99px; background:linear-gradient(90deg,var(--blue),var(--green)); }
.mastery-progress::-moz-progress-bar, .mini-progress::-moz-progress-bar { border-radius:99px; background:linear-gradient(90deg,var(--blue),var(--green)); }
.metric-row { display:flex; justify-content:space-between; gap:12px; padding:9px 0; border-bottom:1px solid rgba(255,255,255,.06); }
.metric-row:last-child { border-bottom:0; }
.metric-row span { color:var(--muted); }
.metric-row strong { text-align:right; }
.card-heading { display:flex; align-items:start; justify-content:space-between; gap:16px; }
.card-heading p { margin-bottom:0; font-size:12px; }
.legend { display:flex; gap:13px; color:var(--muted); font-size:11px; }
.legend i { display:inline-block; width:8px; height:8px; margin-right:5px; border-radius:50%; }
.attempt-dot { background:var(--blue); }
.session-dot { background:var(--accent); }
.activity-chart { display:grid; height:190px; grid-template-columns:repeat(28,1fr); align-items:end; gap:4px; padding-top:18px; }
.day-column { position:relative; display:flex; height:150px; flex-direction:column; justify-content:flex-end; align-items:stretch; gap:5px; }
.day-bar { position:relative; min-height:2px; flex:0 0 auto; border-radius:4px 4px 1px 1px; background:linear-gradient(180deg,var(--blue),#3d819f); }
.day-bar.height-0 { height:2px; opacity:.24; }
.day-bar.height-1 { height:13px; }
.day-bar.height-2 { height:25px; }
.day-bar.height-3 { height:38px; }
.day-bar.height-4 { height:50px; }
.day-bar.height-5 { height:63px; }
.day-bar.height-6 { height:75px; }
.day-bar.height-7 { height:88px; }
.day-bar.height-8 { height:100px; }
.day-bar.height-9 { height:113px; }
.day-bar.height-10 { height:125px; }
.day-bar.session::after { position:absolute; top:-6px; right:50%; width:6px; height:6px; content:""; transform:translateX(50%); border:2px solid var(--surface); border-radius:50%; background:var(--accent); }
.day-label { overflow:visible; color:var(--muted); font-size:9px; text-align:center; white-space:nowrap; }
.signal-item { display:grid; grid-template-columns:1fr auto; gap:8px; padding:10px 0; border-bottom:1px solid rgba(255,255,255,.06); }
.signal-item:last-child { border:0; }
.signal-item small { display:block; color:var(--muted); }
.signal-score { color:var(--green); font-weight:800; }
.needs .signal-score { color:var(--red); }
.review .signal-score { color:var(--orange); }
.empty-state { padding:20px 0; color:var(--muted); font-size:13px; }
.filters { display:flex; width:min(560px,50%); gap:8px; }
.table-wrap { overflow:auto; border:1px solid var(--border); border-radius:12px; background:var(--surface); }
table { width:100%; border-collapse:collapse; }
th, td { padding:13px 14px; border-bottom:1px solid var(--border); text-align:left; white-space:nowrap; }
th { position:sticky; top:0; z-index:1; background:#101923; color:var(--muted); font-size:10px; letter-spacing:.08em; text-transform:uppercase; }
td { font-size:12px; }
tbody tr:last-child td { border-bottom:0; }
tbody tr:hover { background:rgba(255,255,255,.025); }
.skill-name { min-width:220px; white-space:normal; }
.skill-name strong, .skill-name small { display:block; }
.skill-name small { color:var(--muted); }
.mastery-cell { min-width:145px; }
.mastery-line { display:flex; align-items:center; gap:8px; }
.status-chip, .override-chip { display:inline-block; margin-top:5px; padding:2px 7px; border-radius:99px; background:rgba(148,167,183,.12); color:var(--muted); font-size:9px; font-weight:800; letter-spacing:.06em; text-transform:uppercase; }
.status-chip.needs_support { background:rgba(239,118,122,.12); color:#ff9da0; }
.status-chip.strong { background:rgba(115,211,155,.12); color:var(--green); }
.status-chip.developing { background:rgba(91,192,235,.12); color:var(--blue); }
.status-chip.review_due { background:rgba(242,166,90,.12); color:var(--orange); }
.override-chip { background:rgba(173,141,240,.15); color:#c4aff6; }
.trend-up { color:var(--green); }
.trend-down { color:var(--red); }
.row-action { padding:6px 9px; background:transparent; color:var(--blue); border:1px solid var(--border); font-size:11px; }
.checkpoint-list { display:grid; gap:9px; }
.checkpoint-row { display:grid; grid-template-columns:46px minmax(240px,1.4fr) minmax(180px,.8fr) 110px 130px 170px; align-items:center; gap:14px; padding:13px 15px; border:1px solid var(--border); border-radius:10px; background:var(--surface); }
.checkpoint-row.current { border-color:rgba(240,192,64,.7); box-shadow:inset 3px 0 var(--accent); }
.checkpoint-row.completed { opacity:.82; }
.checkpoint-number { display:grid; width:35px; height:35px; place-items:center; border-radius:8px; background:var(--card-2); font-weight:850; }
.checkpoint-title strong, .checkpoint-title small { display:block; }
.checkpoint-title small, .checkpoint-meta { color:var(--muted); font-size:11px; }
.readiness.ready { color:var(--green); }
.readiness.building { color:var(--orange); }
.checkpoint-actions { display:flex; justify-content:flex-end; gap:6px; }
.checkpoint-actions button { padding:6px 8px; font-size:10px; }
.compact table td, .compact table th { padding:10px; }
.incorrect-item { padding:10px 0; border-bottom:1px solid rgba(255,255,255,.06); }
.incorrect-item:last-child { border:0; }
.incorrect-item strong, .incorrect-item small { display:block; }
.incorrect-item small { color:var(--muted); }
.control-grid { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:16px; }
.control-grid .card > button { margin-top:10px; }
.force-card { border-color:rgba(242,166,90,.42); }
.force-card hr { height:1px; margin:24px 0; border:0; background:var(--border); }
.danger-label { color:var(--orange); font-size:11px; font-weight:800; letter-spacing:.08em; text-transform:uppercase; }
.reward-control { display:grid; grid-template-columns:1fr auto; align-items:center; gap:10px; padding:10px 0; border-bottom:1px solid rgba(255,255,255,.06); }
.reward-control:last-child { border:0; }
.reward-control small { display:block; color:var(--muted); }
.audit-item { padding:10px 0; border-bottom:1px solid rgba(255,255,255,.06); }
.audit-item:last-child { border:0; }
.audit-item time { display:block; color:var(--muted); font-size:10px; }
dialog { width:min(520px,calc(100% - 30px)); border:1px solid var(--border); border-radius:14px; padding:26px; background:var(--surface); color:var(--text); box-shadow:var(--shadow); }
dialog::backdrop { background:rgba(2,7,12,.78); backdrop-filter:blur(4px); }
.dialog-actions { display:flex; justify-content:flex-end; gap:8px; margin-top:22px; }

@media (max-width:1180px) {
  .summary-grid { grid-template-columns:repeat(3,1fr); }
  .checkpoint-row { grid-template-columns:42px minmax(220px,1fr) 100px 120px 160px; }
  .checkpoint-meta.prereq { display:none; }
}

@media (max-width:820px) {
  .sidebar { position:static; width:auto; border-right:0; border-bottom:1px solid var(--border); }
  .brand { padding:16px; }
  .sidebar nav { display:flex; overflow-x:auto; padding:8px 10px; }
  .nav-button { flex:0 0 auto; }
  .sidebar-footer { display:none; }
  .dashboard-main { margin-left:0; padding:24px 15px 50px; }
  .topbar, .section-heading { align-items:flex-start; flex-direction:column; }
  .top-actions { justify-content:flex-start; }
  .data-note { text-align:left; }
  .summary-grid { grid-template-columns:repeat(2,1fr); }
  .two-column, .two-column.wide-left, .three-column, .control-grid { grid-template-columns:1fr; }
  .filters { width:100%; }
  .checkpoint-row { grid-template-columns:38px 1fr auto; }
  .checkpoint-meta, .readiness { display:none; }
  .checkpoint-actions { grid-column:2 / -1; justify-content:flex-start; }
  .activity-chart { gap:2px; }
  .day-label { display:none; }
}

@media (max-width:480px) {
  .login-card { padding:28px 22px; }
  .summary-grid { grid-template-columns:1fr 1fr; }
  .summary-card { min-height:112px; padding:14px; }
  .summary-value { font-size:24px; }
  .filters { flex-direction:column; }
  .top-actions button { flex:1 1 45%; }
}

@media print {
  :root { color-scheme:light; --bg:#fff; --surface:#fff; --card:#fff; --card-2:#f3f5f7; --border:#cdd4da; --text:#17202a; --muted:#52606d; }
  body { background:#fff; }
  .sidebar, .top-actions, .filters, .row-action, .checkpoint-actions, #controlsPanel, .global-message { display:none !important; }
  .dashboard-main { margin:0; padding:0; }
  .panel { display:block !important; break-before:page; }
  #overviewPanel { break-before:auto; }
  .card, .summary-card, .table-wrap, .checkpoint-row { box-shadow:none; break-inside:avoid; }
  .activity-chart { height:150px; }
}