/* ============================================================
   Practice Lab — design system
   ink + sheet + marker teal. Examiner red is reserved for
   corrections only; band gold is reserved for scores and XP.
   ============================================================ */

:root{
  /* colour */
  --ink:#0E1726;
  --ink-2:#17233A;
  --ink-3:#243352;
  --slate:#4A5B78;
  --slate-2:#7387A3;
  --line:#DEE4EC;
  --line-2:#EDF1F5;
  --bg:#F2F4F7;
  --card:#FFFFFF;
  --sheet:#FCFBF7;          /* reading + writing surfaces only */
  --teal:#0E9F8F;
  --teal-dk:#0A7C70;
  --teal-tint:#E6F5F3;
  --gold:#E8A33D;
  --gold-tint:#FDF3E2;
  --red:#D6453D;            /* examiner's pen — corrections only */
  --red-tint:#FCEDEC;
  --green:#2F8F5B;
  --focus:#1B6BFF;

  /* type */
  --display:"Bricolage Grotesque",ui-sans-serif,system-ui,sans-serif;
  --body:"Public Sans",ui-sans-serif,system-ui,-apple-system,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,monospace;

  /* space + shape */
  --r-sm:8px; --r:14px; --r-lg:20px; --r-xl:28px;
  --sp:16px;
  --shadow:0 1px 2px rgba(14,23,38,.05), 0 8px 24px -12px rgba(14,23,38,.18);
  --shadow-lg:0 2px 4px rgba(14,23,38,.06), 0 24px 48px -20px rgba(14,23,38,.28);
  --rail-w:236px;
}

*,*::before,*::after{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--body);font-size:16px;line-height:1.55;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-family:var(--display);font-weight:700;letter-spacing:-.02em;line-height:1.12;margin:0}
h1{font-size:clamp(28px,4.6vw,44px)}
h2{font-size:clamp(22px,3vw,30px)}
h3{font-size:19px}
h4{font-size:16px;letter-spacing:-.01em}
p{margin:0 0 1em}
a{color:var(--teal-dk)}
button{font:inherit}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px;border-radius:6px}
.skip-link{position:absolute;left:-9999px;top:8px;background:var(--ink);color:#fff;padding:10px 16px;border-radius:8px;z-index:99}
.skip-link:focus{left:8px}
[hidden]{display:none !important}
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums}
.eyebrow{font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--slate-2)}
.muted{color:var(--slate)}
.small{font-size:13.5px}
.center{text-align:center}

/* ---------- boot ---------- */
.boot{min-height:100dvh;display:grid;place-content:center;justify-items:center;gap:14px;color:var(--slate)}
.boot-mark,.brand-mark{
  width:42px;height:42px;border-radius:12px;display:grid;place-items:center;
  background:var(--ink);color:#fff;font-family:var(--display);font-weight:800;font-size:15px;letter-spacing:-.03em;
}

/* ---------- shell ---------- */
.shell{min-height:100dvh}
.rail{display:none}
.main{padding:22px 18px 96px;max-width:1180px;margin:0 auto}
.main:focus{outline:none}

@media (min-width:900px){
  .shell{display:grid;grid-template-columns:var(--rail-w) 1fr}
  .rail{
    display:flex;flex-direction:column;gap:8px;position:sticky;top:0;height:100dvh;
    background:var(--ink);color:#fff;padding:22px 16px;
  }
  .main{padding:34px 40px 60px;width:100%}
  .tabbar{display:none !important}
}
.rail-brand{display:flex;align-items:center;gap:10px;margin-bottom:18px}
.brand-name{font-family:var(--display);font-weight:700;font-size:17px;letter-spacing:-.02em}
.rail-links{display:flex;flex-direction:column;gap:2px}
.rail-foot{margin-top:auto;border-top:1px solid rgba(255,255,255,.12);padding-top:14px;font-size:13px;color:#9DB0C9}
.rail a,.rail button.navlink{
  display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:10px;
  color:#C6D3E5;text-decoration:none;background:none;border:0;width:100%;text-align:left;cursor:pointer;font-size:14.5px;
}
.rail a:hover,.rail button.navlink:hover{background:rgba(255,255,255,.07);color:#fff}
.rail .is-active{background:var(--teal);color:#fff;font-weight:600}
.navicon{width:18px;text-align:center;opacity:.9}

/* mobile tabs */
.tabbar{
  position:fixed;bottom:0;left:0;right:0;z-index:40;display:grid;grid-auto-flow:column;
  background:#fff;border-top:1px solid var(--line);padding:6px 4px calc(6px + env(safe-area-inset-bottom));
}
.tabbar button{
  background:none;border:0;display:grid;justify-items:center;gap:3px;padding:8px 2px;color:var(--slate-2);
  font-size:11px;border-radius:10px;cursor:pointer;min-height:52px;
}
.tabbar button .navicon{font-size:17px}
.tabbar .is-active{color:var(--teal-dk);font-weight:600}

/* ---------- primitives ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);padding:20px;box-shadow:var(--shadow)}
.card.tight{padding:16px}
.grid{display:grid;gap:16px}
.g2{grid-template-columns:1fr}
.g3{grid-template-columns:1fr}
.g4{grid-template-columns:repeat(2,1fr)}
@media(min-width:700px){.g2{grid-template-columns:1fr 1fr}.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}}
.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.row.between{justify-content:space-between}
.stack{display:grid;gap:12px}
.stack-lg{display:grid;gap:26px}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:46px;padding:0 20px;border-radius:12px;border:1px solid transparent;
  background:var(--teal);color:#fff;font-weight:600;font-size:15px;cursor:pointer;
  transition:transform .12s ease, background .15s ease;
}
.btn:hover{background:var(--teal-dk)}
.btn:active{transform:translateY(1px)}
.btn[disabled]{opacity:.5;cursor:not-allowed}
.btn.ghost{background:#fff;border-color:var(--line);color:var(--ink)}
.btn.ghost:hover{background:var(--line-2)}
.btn.dark{background:var(--ink)}
.btn.dark:hover{background:var(--ink-2)}
.btn.sm{min-height:38px;padding:0 14px;font-size:14px;border-radius:10px}
.btn.block{width:100%}
.btn.danger{background:var(--red)}

.tag{display:inline-flex;align-items:center;gap:6px;font-family:var(--mono);font-size:11px;letter-spacing:.08em;
  text-transform:uppercase;padding:4px 9px;border-radius:999px;background:var(--line-2);color:var(--slate)}
.tag.teal{background:var(--teal-tint);color:var(--teal-dk)}
.tag.gold{background:var(--gold-tint);color:#946117}
.tag.red{background:var(--red-tint);color:var(--red)}

input[type=text],input[type=email],input[type=password],input[type=number],select,textarea{
  width:100%;font:inherit;color:var(--ink);background:#fff;border:1px solid var(--line);
  border-radius:10px;padding:11px 12px;min-height:46px;
}
textarea{min-height:180px;resize:vertical;line-height:1.65}
label{display:block;font-size:13.5px;font-weight:600;margin-bottom:5px;color:var(--slate)}
.field{margin-bottom:14px}

.notice{border:1px solid var(--line);border-left:3px solid var(--gold);background:var(--gold-tint);
  padding:12px 14px;border-radius:10px;font-size:14px;color:#7A5210}
.notice.info{border-left-color:var(--teal);background:var(--teal-tint);color:var(--teal-dk)}
.notice.bad{border-left-color:var(--red);background:var(--red-tint);color:#93231D}

.empty{border:1px dashed var(--line);border-radius:var(--r-lg);padding:34px 20px;text-align:center;color:var(--slate);background:#fff}

/* ---------- band ruler (signature) ---------- */
.ruler{--pct:0%;padding:6px 2px 2px}
.ruler-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:12px}
.ruler-score{font-family:var(--mono);font-weight:600;font-size:46px;letter-spacing:-.04em;line-height:1}
.ruler-target{font-family:var(--mono);font-size:13px;color:var(--slate)}
.ruler-track{position:relative;height:46px}
.ruler-line{position:absolute;left:0;right:0;top:14px;height:6px;border-radius:3px;background:var(--line-2);overflow:hidden}
.ruler-fill{height:100%;width:var(--pct);background:linear-gradient(90deg,var(--teal),var(--gold));
  border-radius:3px;transition:width .7s cubic-bezier(.22,1,.36,1)}
.ruler-ticks{position:absolute;left:0;right:0;top:0;height:14px;display:flex;justify-content:space-between}
.ruler-ticks i{width:1px;height:8px;background:var(--line);display:block}
.ruler-ticks i.major{height:13px;background:var(--slate-2)}
.ruler-marker{
  position:absolute;top:6px;left:var(--pct);transform:translateX(-50%);
  width:3px;height:22px;background:var(--ink);border-radius:2px;transition:left .7s cubic-bezier(.22,1,.36,1);
}
.ruler-marker::after{content:"";position:absolute;left:50%;top:-6px;transform:translateX(-50%);
  border:6px solid transparent;border-top-color:var(--ink)}
.ruler-scale{display:flex;justify-content:space-between;font-family:var(--mono);font-size:11px;color:var(--slate-2);margin-top:2px}
.ruler-goal{position:absolute;top:2px;left:0;width:2px;height:30px;background:var(--gold);opacity:.9}

/* criteria bars */
.crit{display:grid;gap:10px}
.crit-row{display:grid;grid-template-columns:1fr 46px;gap:10px;align-items:center}
.crit-name{font-size:14px}
.crit-bar{grid-column:1/-1;height:7px;border-radius:4px;background:var(--line-2);overflow:hidden}
.crit-bar span{display:block;height:100%;background:var(--ink-3);border-radius:4px}
.crit-val{font-family:var(--mono);font-weight:600;text-align:right}

/* stats */
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:14px}
.stat b{display:block;font-family:var(--mono);font-size:26px;font-weight:600;letter-spacing:-.03em}
.stat span{font-size:12.5px;color:var(--slate)}

/* ---------- corrections (examiner's pen) ---------- */
.correction{border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:#fff}
.correction + .correction{margin-top:12px}
.correction .strip{padding:12px 14px;font-family:var(--sheet)}
.correction .orig{background:var(--red-tint);border-bottom:1px solid var(--line-2)}
.correction .orig s{color:var(--red);text-decoration-thickness:2px}
.correction .fix{background:var(--teal-tint);border-bottom:1px solid var(--line-2)}
.correction .fix b{color:var(--teal-dk);font-weight:600}
.correction .why{font-size:14px;color:var(--slate);padding:12px 14px}
.correction .why em{color:var(--ink);font-style:normal;font-weight:600}

/* ---------- practice surface ---------- */
.exam-top{
  position:sticky;top:0;z-index:30;background:var(--ink);color:#fff;
  margin:-22px -18px 18px;padding:12px 18px;display:flex;align-items:center;gap:14px;justify-content:space-between;
}
@media(min-width:900px){.exam-top{margin:-34px -40px 22px;padding:14px 40px;border-radius:0}}
.exam-top .where{display:grid;gap:2px;min-width:0}
.exam-top .where b{font-size:14.5px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.exam-top .where span{font-size:11.5px;color:#9DB0C9;font-family:var(--mono);letter-spacing:.06em;text-transform:uppercase}
.timer{font-family:var(--mono);font-size:20px;font-weight:600;letter-spacing:-.02em;padding:5px 10px;border-radius:9px;background:rgba(255,255,255,.1)}
.timer.warn{background:rgba(214,69,61,.25);color:#FFB4AF}

.sheet{background:var(--sheet);border:1px solid #E9E4D8;border-radius:var(--r-lg);padding:20px}
.sheet .passage{font-size:16.5px;line-height:1.75;max-width:68ch}
.sheet .passage p{margin-bottom:1.1em}
.qtext{font-size:16px;line-height:1.6}
.instructions{font-size:14px;color:var(--slate);border-left:3px solid var(--line);padding-left:12px;margin-bottom:16px}

.items{display:grid;gap:14px}
.item{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:14px}
.item .num{font-family:var(--mono);font-size:12px;color:var(--slate-2);margin-bottom:6px}
.choices{display:grid;gap:8px;margin-top:10px}
.choice{display:flex;gap:10px;align-items:flex-start;padding:11px 12px;border:1px solid var(--line);
  border-radius:10px;cursor:pointer;background:#fff;min-height:46px}
.choice:hover{border-color:var(--slate-2)}
.choice input{margin-top:3px;accent-color:var(--teal);width:18px;height:18px}
.choice.picked{border-color:var(--teal);background:var(--teal-tint)}
.item.right{border-color:var(--green);background:#F1F8F3}
.item.wrong{border-color:var(--red);background:var(--red-tint)}
.verdict{font-size:13.5px;margin-top:8px;color:var(--slate)}
.verdict b{color:var(--ink)}

.wordpick{line-height:2.1;font-size:16.5px}
.wordpick button{background:none;border:0;padding:1px 3px;border-radius:5px;cursor:pointer}
.wordpick button.on{background:var(--red-tint);color:var(--red);text-decoration:line-through;font-weight:600}

.reorder{display:grid;gap:8px}
.reorder .r-item{display:flex;gap:10px;align-items:flex-start;background:#fff;border:1px solid var(--line);
  border-radius:var(--r);padding:12px}
.reorder .r-move{display:grid;gap:4px}
.reorder .r-move button{width:34px;height:30px;border-radius:8px;border:1px solid var(--line);background:#fff;cursor:pointer}

.writer{position:relative}
.writer textarea{min-height:300px;background:var(--sheet);border-color:#E9E4D8;font-size:16.5px}
.wcount{display:flex;gap:12px;justify-content:space-between;font-family:var(--mono);font-size:12.5px;color:var(--slate);margin-top:8px}
.wcount .under{color:var(--red)}

.recorder{display:grid;gap:12px;justify-items:center;padding:18px;background:var(--ink);border-radius:var(--r-lg);color:#fff}
.rec-btn{width:76px;height:76px;border-radius:50%;border:3px solid rgba(255,255,255,.25);background:var(--red);cursor:pointer}
.rec-btn.on{background:#fff;border-color:var(--red);animation:pulse 1.4s infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(214,69,61,.6)}50%{box-shadow:0 0 0 14px rgba(214,69,61,0)}}
.rec-time{font-family:var(--mono);font-size:22px}
.transcript{background:var(--sheet);border:1px dashed #E9E4D8;border-radius:var(--r);padding:14px;min-height:90px;font-size:15.5px}

/* audio player */
.player{display:flex;gap:12px;align-items:center;background:var(--ink-2);color:#fff;padding:14px;border-radius:var(--r-lg);flex-wrap:wrap}
.player .plays{font-family:var(--mono);font-size:12px;color:#9DB0C9}

/* charts */
.chart-wrap{background:var(--sheet);border:1px solid #E9E4D8;border-radius:var(--r-lg);padding:16px;overflow-x:auto}
.spark{width:100%;height:150px;display:block}

/* landing */
.hero{background:var(--ink);color:#fff;border-radius:var(--r-xl);padding:34px 22px;position:relative;overflow:hidden}
@media(min-width:900px){.hero{padding:64px 56px}}
.hero h1{font-size:clamp(34px,6vw,60px);font-weight:800;max-width:15ch}
.hero p.lede{color:#C6D3E5;font-size:17px;max-width:52ch;margin-top:16px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}
.hero .btn.ghost{background:transparent;border-color:rgba(255,255,255,.3);color:#fff}
.hero .btn.ghost:hover{background:rgba(255,255,255,.1)}
.hero-ruler{margin-top:34px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:var(--r-lg);padding:18px}
.hero-ruler .ruler-line{background:rgba(255,255,255,.16)}
.hero-ruler .ruler-marker{background:#fff}
.hero-ruler .ruler-marker::after{border-top-color:#fff}
.hero-ruler .ruler-scale,.hero-ruler .ruler-target{color:#9DB0C9}
.hero-ruler .ruler-ticks i{background:rgba(255,255,255,.25)}

.section{margin-top:44px}
.section-head{margin-bottom:18px;max-width:60ch}
.faq details{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:14px 16px;margin-bottom:10px}
.faq summary{cursor:pointer;font-weight:600}

/* tables */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:#fff}
table{border-collapse:collapse;width:100%;font-size:14px;min-width:620px}
th,td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line-2);white-space:nowrap}
th{font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--slate-2);background:var(--line-2)}
tbody tr:hover{background:var(--line-2)}
tbody tr{cursor:pointer}

/* toasts + modal */
.toasts{position:fixed;left:12px;right:12px;bottom:calc(70px + env(safe-area-inset-bottom));z-index:80;display:grid;gap:8px;pointer-events:none}
@media(min-width:900px){.toasts{left:auto;right:20px;bottom:20px;width:340px}}
.toast{background:var(--ink);color:#fff;padding:12px 14px;border-radius:12px;box-shadow:var(--shadow-lg);font-size:14px}
.toast.bad{background:var(--red)}
.modal-back{position:fixed;inset:0;background:rgba(14,23,38,.55);z-index:90;display:grid;place-items:end center;padding:0}
@media(min-width:700px){.modal-back{place-items:center;padding:20px}}
.modal{background:#fff;border-radius:var(--r-xl) var(--r-xl) 0 0;padding:22px;width:100%;max-width:560px;max-height:88dvh;overflow:auto}
@media(min-width:700px){.modal{border-radius:var(--r-xl)}}

/* misc */
.streak{display:inline-flex;gap:6px;align-items:center;font-family:var(--mono);font-size:13px;background:var(--gold-tint);
  color:#946117;padding:5px 10px;border-radius:999px}
.badge-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(96px,1fr));gap:10px}
.badge{border:1px solid var(--line);border-radius:var(--r);padding:12px 8px;text-align:center;background:#fff;font-size:12px}
.badge.locked{opacity:.42}
.badge i{display:block;font-size:22px;font-style:normal;margin-bottom:4px}

.pick-grid{display:grid;gap:12px}
@media(min-width:700px){.pick-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}}
.pick{
  text-align:left;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:15px;cursor:pointer;
  display:grid;gap:5px;transition:border-color .15s ease, transform .12s ease;
}
.pick:hover{border-color:var(--teal);transform:translateY(-2px)}
.pick b{font-size:15px}
.pick span{font-size:13px;color:var(--slate)}

.progress-line{height:6px;background:var(--line-2);border-radius:4px;overflow:hidden}
.progress-line span{display:block;height:100%;background:var(--teal)}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms !important;transition-duration:.001ms !important}
}
@media print{
  .rail,.tabbar,.exam-top,.btn{display:none !important}
  body{background:#fff}
}