:root{
  --navy:#002060; --navy-2:#0b2f7a; --navy-ink:#0f1b3d;
  --amber:#D4A017; --amber-2:#f3c552; --amber-soft:#fff6db;
  --paper:#f5f7fb; --card:#ffffff; --line:#dfe4ee;
  --ink:#1b2133; --ink-2:#5a6478; --ok:#1c7c4b; --ok-soft:#e5f6ec; --bad:#b42318; --bad-soft:#fdecea;
  --radius:12px; --shadow:0 1px 2px rgba(15,27,61,.06),0 6px 20px rgba(15,27,61,.06);
  --font:"Sora",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font);font-size:15px;line-height:1.55}
a{color:var(--navy-2)}
.wrap{max-width:1100px;margin:0 auto;padding:0 20px}
.page{padding-top:28px;padding-bottom:60px;min-height:70vh}

/* top bar */
.topbar{background:var(--navy);color:#fff;border-bottom:4px solid var(--amber)}
.topbar .wrap{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:68px;flex-wrap:wrap;padding-top:8px;padding-bottom:8px}
.brand{display:flex;align-items:center;gap:12px;color:#fff;text-decoration:none}
.brand-mark{background:var(--amber);color:var(--navy);font-weight:700;letter-spacing:.06em;padding:8px 10px;border-radius:8px;font-size:13px}
.brand-text{display:flex;flex-direction:column;line-height:1.2}
.brand-text small{opacity:.75;font-size:12px}
.nav{display:flex;gap:4px;flex-wrap:wrap}
.nav a{color:#fff;text-decoration:none;padding:8px 12px;border-radius:8px;font-size:14px}
.nav a:hover{background:rgba(255,255,255,.12)}
.nav a.muted{opacity:.7}

/* layout */
.grid{display:grid;gap:20px}
.grid-2{grid-template-columns:1fr 1fr}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-side{grid-template-columns:2fr 1fr}
@media (max-width:820px){.grid-2,.grid-3,.grid-side{grid-template-columns:1fr}}

.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}
.card h2{margin:0 0 12px;font-size:18px}
.card h3{margin:18px 0 8px;font-size:15px}
.eyebrow{display:inline-block;font-size:12px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--amber);margin-bottom:6px}
h1{font-size:26px;margin:0 0 6px;color:var(--navy)}
.lead{color:var(--ink-2);margin:0 0 22px}
.stack>*+*{margin-top:14px}

/* forms */
label{display:block;font-weight:600;font-size:13px;margin-bottom:6px}
input[type=text],input[type=password],input[type=date],input[type=datetime-local],input[type=number],input[type=tel],select,textarea{
  width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:9px;font:inherit;background:#fff;color:var(--ink)}
input:focus,select:focus,textarea:focus{outline:3px solid rgba(212,160,23,.35);border-color:var(--amber)}
textarea{min-height:140px;resize:vertical}
textarea.code{font-family:var(--mono);font-size:13px;min-height:420px;line-height:1.5;tab-size:2;background:#0f1b3d;color:#e8edf7;border-color:#0f1b3d}
.field+.field{margin-top:14px}
.help{color:var(--ink-2);font-size:13px;margin-top:6px}
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--navy);color:#fff;border:0;border-radius:9px;padding:11px 18px;font:inherit;font-weight:600;cursor:pointer;text-decoration:none}
.btn:hover{background:var(--navy-2)}
.btn-amber{background:var(--amber);color:var(--navy)}
.btn-amber:hover{background:var(--amber-2)}
.btn-ghost{background:transparent;color:var(--navy);border:1px solid var(--line)}
.btn-ghost:hover{background:#eef2fa}
.btn-sm{padding:6px 11px;font-size:13px}
.btn-danger{background:var(--bad)}
.btn[disabled]{opacity:.5;cursor:not-allowed}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px;align-items:center}

/* flashes & badges */
.flash{padding:12px 16px;border-radius:10px;margin-bottom:18px;border:1px solid}
.flash-ok{background:var(--ok-soft);border-color:#b9e3c9;color:var(--ok)}
.flash-error{background:var(--bad-soft);border-color:#f3b8b1;color:var(--bad)}
.flash-info{background:var(--amber-soft);border-color:#f0d78a;color:#6b4d00}
.badge{display:inline-block;padding:3px 9px;border-radius:999px;font-size:12px;font-weight:600}
.badge-navy{background:#e4e9f7;color:var(--navy)}
.badge-amber{background:var(--amber-soft);color:#7a5800}
.badge-ok{background:var(--ok-soft);color:var(--ok)}
.badge-bad{background:var(--bad-soft);color:var(--bad)}

/* attempts meter — signature element */
.attempts{display:flex;gap:8px;align-items:center}
.attempts .pip{width:34px;height:10px;border-radius:999px;background:#e4e9f7}
.attempts .pip.used{background:var(--amber)}
.attempts .lbl{font-size:13px;color:var(--ink-2);margin-left:6px}

/* score */
.score-big{font-size:56px;font-weight:700;color:var(--navy);line-height:1}
.score-big small{font-size:18px;color:var(--ink-2);font-weight:400}
.bar{height:10px;background:#e4e9f7;border-radius:999px;overflow:hidden}
.bar>i{display:block;height:100%;background:var(--amber)}
.rubric{width:100%;border-collapse:collapse;font-size:14px}
.rubric td{padding:8px 0;border-bottom:1px solid var(--line);vertical-align:top}
.rubric td:last-child{text-align:right;white-space:nowrap;font-weight:600}

/* tables */
table.data{width:100%;border-collapse:collapse;font-size:14px;background:#fff}
table.data th,table.data td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:middle}
table.data th{background:#eef2fa;color:var(--navy);font-size:12px;letter-spacing:.05em;text-transform:uppercase}
table.data tr:hover td{background:#fafbfe}
.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:var(--radius)}

/* stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:22px}
@media (max-width:820px){.stats{grid-template-columns:1fr 1fr}}
.stat{background:var(--navy);color:#fff;border-radius:var(--radius);padding:16px 18px}
.stat b{display:block;font-size:28px;line-height:1.1}
.stat span{font-size:12px;opacity:.8}
.stat.amber{background:var(--amber);color:var(--navy)}

/* brief / prose */
.brief{font-size:15px}
.brief h3{color:var(--navy);margin-top:18px}
.brief ul,.brief ol{padding-left:22px}
.brief li{margin:4px 0}
.brief code{font-family:var(--mono);background:#eef2fa;padding:1px 5px;border-radius:4px;font-size:13px}
pre.code{font-family:var(--mono);font-size:12.5px;background:#0f1b3d;color:#e8edf7;padding:16px;border-radius:10px;overflow:auto;line-height:1.5;max-height:600px}

/* login */
.login{max-width:440px;margin:40px auto}
.login .card{padding:30px}
.countdown{font-family:var(--mono);font-weight:500;color:var(--navy)}

/* marking overlay */
.overlay{position:fixed;inset:0;background:rgba(0,32,96,.85);color:#fff;display:none;align-items:center;justify-content:center;flex-direction:column;gap:16px;z-index:50;text-align:center;padding:20px}
.overlay.show{display:flex}
.spinner{width:52px;height:52px;border:5px solid rgba(255,255,255,.25);border-top-color:var(--amber);border-radius:50%;animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion:reduce){.spinner{animation:none}}

.foot{border-top:1px solid var(--line);color:var(--ink-2);font-size:12px;padding:18px 0}
.small{font-size:13px;color:var(--ink-2)}
.right{text-align:right}
.inline{display:inline}