/* ===== UniTest — design tokens ===== */
:root{
  --ink:#1C2B45;
  --ink-soft:#33456A;
  --paper:#FAF7F1;
  --paper-raised:#FFFFFF;
  --paper-line:#E4DCC9;
  --correct:#3F7A5C;
  --correct-bg:#E9F1EA;
  --incorrect:#B54A3E;
  --incorrect-bg:#F6E9E6;
  --accent:#D98F3B;
  --accent-soft:#F3E1C4;
  --muted:#8A8272;
  --radius:14px;
  --shadow:0 1px 2px rgba(28,43,69,.06), 0 8px 24px rgba(28,43,69,.06);
  --font-display:'Fraunces', Georgia, serif;
  --font-body:'IBM Plex Sans', -apple-system, sans-serif;
  --font-mono:'IBM Plex Mono', ui-monospace, monospace;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;}
button{font-family:inherit;cursor:pointer;}

h1,h2,h3{
  font-family:var(--font-display);
  font-weight:600;
  letter-spacing:-0.01em;
  margin:0 0 .4em;
  color:var(--ink);
}
h1{font-size:clamp(2.1rem,4vw,3.4rem);font-weight:500;line-height:1.05;}
h2{font-size:clamp(1.5rem,2.6vw,2.1rem);font-weight:500;}
h3{font-size:1.15rem;font-weight:600;}
p{margin:0 0 1em;color:var(--ink-soft);}
.muted{color:var(--muted);}
.mono{font-family:var(--font-mono);}

.wrap{max-width:1120px;margin:0 auto;padding:0 24px;}
.wrap-narrow{max-width:760px;margin:0 auto;padding:0 24px;}

/* stitched divider — evokes a stapled worksheet edge */
.stitch{
  height:1px;
  background-repeat:repeat-x;
  background-image:linear-gradient(90deg, var(--paper-line) 60%, transparent 0);
  background-size:10px 1px;
  border:none;
  margin:0;
}

/* nav */
.nav{
  position:sticky;top:0;z-index:20;
  background:rgba(250,247,241,.9);
  backdrop-filter:blur(6px);
  border-bottom:1px solid var(--paper-line);
}
.nav-inner{
  max-width:1120px;margin:0 auto;padding:16px 24px;
  display:flex;align-items:center;justify-content:space-between;
}
.logo{
  font-family:var(--font-display);font-size:1.35rem;font-weight:600;
  text-decoration:none;color:var(--ink);display:flex;align-items:center;gap:8px;
}
.logo .mark{
  width:26px;height:26px;border-radius:7px;background:var(--ink);
  display:inline-flex;align-items:center;justify-content:center;
  color:var(--paper);font-family:var(--font-mono);font-size:13px;font-weight:600;
  transform:rotate(-4deg);
}
.nav-links{display:flex;gap:28px;align-items:center;font-size:.94rem;}
.nav-links a{text-decoration:none;color:var(--ink-soft);}
.nav-links a:hover{color:var(--ink);}

/* buttons */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:10px;border:1px solid transparent;
  font-size:.95rem;font-weight:600;text-decoration:none;
  transition:transform .12s ease, box-shadow .12s ease, background .15s ease;
}
.btn:active{transform:translateY(1px);}
.btn-primary{background:var(--ink);color:var(--paper);}
.btn-primary:hover{box-shadow:0 6px 18px rgba(28,43,69,.25);}
.btn-accent{background:var(--accent);color:#fff;}
.btn-accent:hover{box-shadow:0 6px 18px rgba(217,143,59,.35);}
.btn-ghost{background:transparent;border-color:var(--paper-line);color:var(--ink);}
.btn-ghost:hover{border-color:var(--ink);}
.btn-sm{padding:8px 14px;font-size:.85rem;border-radius:8px;}
.btn-block{width:100%;}
.btn[disabled]{opacity:.45;cursor:not-allowed;}

/* card */
.card{
  background:var(--paper-raised);
  border:1px solid var(--paper-line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}
.pad{padding:28px;}
.pad-sm{padding:18px;}

/* pills / tags */
.pill{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 11px;border-radius:100px;
  font-size:.78rem;font-weight:600;font-family:var(--font-mono);
  background:var(--accent-soft);color:#8A5A19;
  letter-spacing:.02em;
}
.pill-muted{background:#EFEBE0;color:var(--muted);}

/* form */
.field{margin-bottom:18px;}
.field label{display:block;font-size:.86rem;font-weight:600;margin-bottom:6px;color:var(--ink-soft);}
.field input, .field select, .field textarea{
  width:100%;padding:12px 14px;border-radius:9px;
  border:1px solid var(--paper-line);background:var(--paper);
  font-family:var(--font-body);font-size:.95rem;color:var(--ink);
  outline:none;transition:border-color .12s ease, background .12s ease;
}
.field input:focus, .field select:focus, .field textarea:focus{
  border-color:var(--ink);background:#fff;
}
.field-hint{font-size:.8rem;color:var(--muted);margin-top:6px;}
.check-row{display:flex;align-items:center;gap:8px;font-size:.88rem;color:var(--ink-soft);}

/* progress */
.progress-track{
  height:8px;border-radius:100px;background:var(--paper-line);overflow:hidden;
}
.progress-fill{
  height:100%;background:var(--accent);border-radius:100px;
  transition:width .3s ease;
}

/* grading marks — the signature element */
.mark{
  position:absolute;width:46px;height:46px;pointer-events:none;
}
.mark svg{width:100%;height:100%;}

/* skeleton */
.skel{background:linear-gradient(90deg,#EFEAE0 25%,#F6F2EA 37%,#EFEAE0 63%);
  background-size:400% 100%;animation:skel 1.4s ease infinite;border-radius:8px;}
@keyframes skel{0%{background-position:100% 0}100%{background-position:0 0}}

/* toast */
.toast{
  position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(20px);
  background:var(--ink);color:var(--paper);padding:12px 20px;border-radius:10px;
  font-size:.9rem;box-shadow:var(--shadow);opacity:0;transition:all .25s ease;
  z-index:100;pointer-events:none;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0);}

/* table */
table{width:100%;border-collapse:collapse;font-size:.9rem;}
th{text-align:left;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.04em;
  text-transform:uppercase;color:var(--muted);padding:10px 14px;border-bottom:1px solid var(--paper-line);}
td{padding:14px;border-bottom:1px solid var(--paper-line);}
tr:last-child td{border-bottom:none;}

footer{border-top:1px solid var(--paper-line);padding:32px 0;margin-top:60px;}
footer .wrap{display:flex;justify-content:space-between;align-items:center;font-size:.85rem;color:var(--muted);}

.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;}

@media (max-width:860px){
  .grid-3{grid-template-columns:1fr 1fr;}
  .grid-4{grid-template-columns:1fr 1fr;}
  .grid-2{grid-template-columns:1fr;}
  .nav-links{display:none;}
}
@media (max-width:560px){
  .grid-3{grid-template-columns:1fr;}
  .grid-4{grid-template-columns:1fr 1fr;}
}

@media (prefers-reduced-motion: reduce){
  *{animation-duration:.001ms !important; transition-duration:.001ms !important;}
}