/* ============================================================
   TOEIC Lab — design tokens
   App chrome: graphite + beam cyan (radiation therapy console)
   Exam: paper test booklet (realistic)
   ============================================================ */
:root{
  --bg:#0a0d12; --bg2:#0e131a; --card:#121922; --card2:#18212c;
  --line:rgba(255,255,255,.07); --line2:rgba(255,255,255,.13);
  --text:#e9eef5; --muted:#8d9aab; --faint:#5d697a;
  --beam:#62d5e8; --beam-2:#3aa9c4; --beam-dim:rgba(98,213,232,.13);
  --gold:#d8bb7f; --ok:#5fd49f; --warn:#f0b65a; --bad:#ef8080;
  --iso100:#ef4444; --iso95:#f97316; --iso80:#facc15; --iso50:#4ade80; --iso30:#22d3ee; --iso10:#3b82f6;
  --r:16px; --r-sm:10px;
  --sans:"Inter","IBM Plex Sans Thai",system-ui,-apple-system,"Segoe UI",sans-serif;
  --serif:"Source Serif 4","Georgia","IBM Plex Sans Thai",serif;
  --safe-b:env(safe-area-inset-bottom,0px);
  /* paper */
  --paper:#f7f6f1; --ink:#15171a; --ink2:#55585e; --rule:#d9d6cc;
  color-scheme:dark;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;background:var(--bg);color:var(--text);font:15px/1.55 var(--sans);-webkit-font-smoothing:antialiased}
body{min-height:100dvh}
button{font:inherit;color:inherit;cursor:pointer}
a{color:var(--beam);text-decoration:none}
h1,h2,h3,h4{margin:0;font-weight:500;letter-spacing:-.015em}
.num{font-variant-numeric:tabular-nums;letter-spacing:-.02em}
.muted{color:var(--muted)} .faint{color:var(--faint)}
.hidden{display:none!important}

/* ---------- layout ---------- */
#app{max-width:920px;margin:0 auto;padding:0 16px calc(96px + var(--safe-b))}
.top{display:flex;align-items:center;justify-content:space-between;padding:18px 0 8px}
.brand{display:flex;align-items:center;gap:10px;font-weight:600;letter-spacing:.02em;font-size:14px}
.brand small{display:block;white-space:nowrap;font-weight:400;color:var(--faint);font-size:11px;letter-spacing:.08em;text-transform:uppercase}
.brand-mark{width:28px;height:28px}
.chip{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border:1px solid var(--line2);border-radius:99px;font-size:12px;color:var(--muted)}
.chip .dot{width:6px;height:6px;border-radius:50%;background:var(--ok);box-shadow:0 0 8px var(--ok)}
.chip.off .dot{background:var(--warn);box-shadow:0 0 8px var(--warn)}
.section{margin-top:26px}
.section-h{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:12px}
.section-h h2{font-size:13px;font-weight:500;color:var(--muted);text-transform:uppercase;letter-spacing:.12em}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media (max-width:640px){.grid2{grid-template-columns:1fr}}

/* ---------- cards ---------- */
.card{background:linear-gradient(180deg,var(--card),var(--bg2));border:1px solid var(--line);border-radius:var(--r);padding:20px;position:relative;overflow:hidden}
.card.tap{color:inherit;display:block;cursor:pointer;transition:border-color .2s,transform .2s}
.card.tap:hover{border-color:var(--line2)}
.card.tap:active{transform:scale(.99)}
.card h3{font-size:17px}
.card p{margin:6px 0 0;color:var(--muted)}
.kicker{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--faint)}
.row{display:flex;align-items:center;gap:12px}
.spacer{flex:1}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:46px;padding:0 20px;border-radius:12px;border:1px solid var(--line2);background:var(--card2);font-weight:500;transition:all .15s}
.btn:hover{border-color:rgba(255,255,255,.22)}
.btn.primary{background:var(--beam);color:#04151a;border-color:transparent;box-shadow:0 0 0 1px rgba(98,213,232,.4),0 8px 28px -10px rgba(98,213,232,.55)}
.btn.primary:hover{filter:brightness(1.07)}
.btn.ghost{background:transparent}
.btn.sm{height:36px;padding:0 14px;font-size:13px;border-radius:10px}
.btn.block{width:100%}
.btn:disabled{opacity:.45;cursor:default}

/* ---------- isodose hero ---------- */
.hero{padding:26px 22px 22px}
.iso{position:absolute;inset:-40px -60px auto auto;width:360px;height:300px;opacity:.55;pointer-events:none}
.score-big{font-size:64px;font-weight:300;line-height:1;letter-spacing:-.04em}
.score-big small{font-size:18px;color:var(--muted);font-weight:400;letter-spacing:0;margin-left:6px}
.dosebar{position:relative;height:8px;border-radius:8px;background:rgba(255,255,255,.06);margin:34px 0 8px;overflow:visible}
.dosebar .fill{position:absolute;inset:0 auto 0 0;border-radius:8px;background:linear-gradient(90deg,var(--iso10),var(--iso30) 40%,var(--beam));box-shadow:0 0 18px -2px rgba(98,213,232,.6)}
.dosebar .range{position:absolute;top:-3px;height:14px;border-radius:7px;background:rgba(98,213,232,.12);border:1px solid rgba(98,213,232,.25)}
.dosebar .target{position:absolute;top:-8px;width:2px;height:24px;background:var(--gold)}
.dosebar .target span{position:absolute;top:-20px;left:50%;transform:translateX(-50%);font-size:11px;color:var(--gold);white-space:nowrap}
.scale{display:flex;justify-content:space-between;font-size:11px;color:var(--faint)}
.lr{display:flex;gap:26px;margin-top:16px}
.lr div{font-size:12px;color:var(--muted)}
.lr b{display:block;font-size:22px;font-weight:400;color:var(--text)}

/* ---------- dwell track (lessons) ---------- */
.dwell{position:relative;padding:12px 6px 4px}
.dwell .cath{position:absolute;left:18px;right:18px;top:27px;height:2px;background:linear-gradient(90deg,rgba(255,255,255,.08),rgba(255,255,255,.16),rgba(255,255,255,.08))}
.dwell .cath i{position:absolute;inset:0 auto 0 0;background:var(--beam);box-shadow:0 0 12px var(--beam)}
.dwell ol{position:relative;list-style:none;margin:0;padding:0;display:flex;justify-content:space-between}
.dwell li{display:flex;flex-direction:column;align-items:center;gap:8px;cursor:pointer;width:40px}
.dwell .pos{width:20px;height:20px;border-radius:50%;border:2px solid rgba(255,255,255,.22);background:var(--bg);transition:all .2s}
.dwell li.done .pos{background:var(--beam);border-color:var(--beam);box-shadow:0 0 0 4px var(--beam-dim),0 0 16px var(--beam)}
.dwell li.next .pos{border-color:var(--gold);box-shadow:0 0 0 4px rgba(216,187,127,.14);animation:pulse 2.2s infinite}
.dwell li span{font-size:11px;color:var(--faint)}
.dwell li.done span{color:var(--text)}
@keyframes pulse{50%{box-shadow:0 0 0 8px rgba(216,187,127,.05)}}

/* ---------- lists ---------- */
.list{display:flex;flex-direction:column;gap:10px}
.li{display:flex;align-items:center;gap:14px;padding:14px 16px;border:1px solid var(--line);border-radius:14px;background:var(--card);cursor:pointer}
.li:hover{border-color:var(--line2)}
.li .ix{width:36px;height:36px;border-radius:10px;display:grid;place-items:center;background:var(--card2);border:1px solid var(--line);font-size:13px;color:var(--muted);flex:none}
.li.done .ix{background:var(--beam-dim);color:var(--beam);border-color:rgba(98,213,232,.3)}
.li .t{font-weight:500}
.li .s{font-size:13px;color:var(--muted)}
.li .arrow{margin-left:auto;color:var(--faint)}
.meter{height:4px;border-radius:4px;background:rgba(255,255,255,.07);overflow:hidden;margin-top:8px}
.meter i{display:block;height:100%;border-radius:4px;background:var(--beam)}
.meter.bad i{background:var(--bad)} .meter.mid i{background:var(--warn)} .meter.good i{background:var(--ok)}

/* ---------- bottom nav ---------- */
.nav{position:fixed;left:0;right:0;bottom:0;z-index:20;background:rgba(10,13,18,.86);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-top:1px solid var(--line);padding:6px 8px calc(6px + var(--safe-b))}
.nav ul{max-width:560px;margin:0 auto;padding:0;list-style:none;display:flex;justify-content:space-around}
.nav a{display:flex;flex-direction:column;align-items:center;gap:3px;padding:6px 10px;font-size:11px;color:var(--faint);border-radius:10px;min-width:58px}
.nav a.on{color:var(--beam)}
.nav svg{width:22px;height:22px}

/* ---------- forms ---------- */
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.field label{font-size:12px;color:var(--muted);letter-spacing:.04em}
.input{height:50px;border-radius:12px;border:1px solid var(--line2);background:var(--bg2);color:var(--text);padding:0 16px;font:inherit;font-size:16px;outline:none}
.input:focus{border-color:var(--beam);box-shadow:0 0 0 3px var(--beam-dim)}
.pin{letter-spacing:.5em;font-variant-numeric:tabular-nums}
.err{color:var(--bad);font-size:13px;min-height:20px}

/* ---------- login ---------- */
.login{min-height:100dvh;display:grid;place-items:center;padding:24px 0}
.login .box{width:100%;max-width:380px}
.login h1{font-size:30px;font-weight:300;margin:28px 0 6px}
.login .iso{position:fixed;inset:auto -120px -160px auto;width:620px;height:520px;opacity:.35}
.banner{border:1px dashed rgba(216,187,127,.4);color:var(--gold);border-radius:12px;padding:10px 14px;font-size:13px;margin-bottom:18px}

/* ---------- tables (admin) ---------- */
.tbl{width:100%;border-collapse:collapse;font-size:14px}
.tbl th{text-align:left;font-weight:500;font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);padding:10px 10px;border-bottom:1px solid var(--line)}
.tbl td{padding:14px 10px;border-bottom:1px solid var(--line);vertical-align:middle}
.tbl tr.tap{cursor:pointer} .tbl tr.tap:hover td{background:rgba(255,255,255,.02)}
.tbl-wrap{overflow-x:auto;margin:0 -4px}
.kpis{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.kpi{padding:16px;border:1px solid var(--line);border-radius:14px;background:var(--card)}
.kpi b{display:block;font-size:26px;font-weight:300}
.kpi span{font-size:12px;color:var(--muted)}
@media (max-width:640px){.kpis{grid-template-columns:1fr 1fr}}
.mini-dwell{display:flex;gap:4px}
.mini-dwell i{width:8px;height:8px;border-radius:50%;background:rgba(255,255,255,.12)}
.mini-dwell i.on{background:var(--beam);box-shadow:0 0 6px var(--beam)}
.delta.up{color:var(--ok)} .delta.down{color:var(--bad)}

/* ---------- lesson ---------- */
.tip{padding:16px 18px;border-left:2px solid var(--beam);background:var(--card);border-radius:0 12px 12px 0;margin-bottom:10px}
.tip h4{font-size:15px;margin-bottom:4px}
.tip p{margin:0;color:#c9d2de}
.tip .ex{margin-top:8px;font-family:var(--serif);color:var(--muted);font-size:14px}
.tip u{text-decoration:none;color:var(--beam);border-bottom:1px solid rgba(98,213,232,.5)}
.vocab{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:8px}
.vw{display:flex;gap:12px;align-items:flex-start;padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:var(--card)}
.vw .say{flex:none;width:32px;height:32px;border-radius:50%;border:1px solid var(--line2);background:transparent;display:grid;place-items:center;color:var(--beam)}
.vw b{font-weight:500}
.vw .th{color:var(--muted);font-size:13px}
.vw .ex{font-family:var(--serif);font-size:13px;color:var(--faint);margin-top:2px}

/* ============================================================
   EXAM — paper test booklet
   ============================================================ */
.exam{position:fixed;inset:0;z-index:50;background:#1a1d22;display:flex;flex-direction:column;color:var(--ink)}
.exam-bar{display:flex;align-items:center;gap:12px;padding:10px 16px;background:#0d1015;color:var(--text);border-bottom:1px solid var(--line)}
.exam-bar .title{font-size:13px;letter-spacing:.06em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0}
.exam-bar .btn{flex:none}
@media (max-width:480px){.exam-bar .lbl{display:none}}
.exam-bar .timer{font-variant-numeric:tabular-nums;font-size:15px;padding:4px 10px;border-radius:8px;border:1px solid var(--line2)}
.exam-bar .timer.low{color:var(--bad);border-color:rgba(239,128,128,.5)}
.exam-body{flex:1;overflow:auto;display:flex;justify-content:center;align-items:flex-start;padding:18px 12px 120px;-webkit-overflow-scrolling:touch}
.page{width:100%;max-width:760px;background:var(--paper);border-radius:4px;box-shadow:0 20px 60px -20px rgba(0,0,0,.6);padding:28px 28px 34px;font-family:var(--serif);font-size:17px;line-height:1.6;min-height:60vh}
@media (max-width:640px){.page{padding:20px 18px 28px;font-size:16px}}
.page .ph{display:flex;justify-content:space-between;font-family:var(--sans);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--ink2);border-bottom:1.5px solid var(--ink);padding-bottom:8px;margin-bottom:18px}
.page h2{font-family:var(--sans);font-weight:700;font-size:20px;letter-spacing:.02em;margin-bottom:8px}
.page .dir{font-size:15px;color:var(--ink2);border:1px solid var(--rule);padding:12px 14px;margin:12px 0 18px;background:#fbfaf6}
.page .qn{font-family:var(--sans);font-weight:700;margin-right:8px}
.page .photo{width:100%;border:1px solid var(--rule);background:#fff;display:block;margin:6px 0 14px;filter:grayscale(1) contrast(1.05)}
.page .mark{font-style:italic;color:var(--ink2);text-align:center;margin:30px 0 10px}
.page .q{margin:16px 0 6px}
.page .opts{display:flex;flex-direction:column;gap:4px;margin:6px 0 18px}
.page .opt{display:flex;gap:10px;align-items:flex-start;padding:8px 10px;border-radius:6px;cursor:pointer;border:1px solid transparent;text-align:left;background:none;font:inherit;color:inherit}
.page .opt:hover{background:rgba(0,0,0,.035)}
.page .opt .b{flex:none;width:26px;height:26px;border-radius:50%;border:1.5px solid var(--ink);display:grid;place-items:center;font-family:var(--sans);font-size:12px;font-weight:600}
.page .opt.sel .b{background:var(--ink);color:var(--paper)}
.page .opt.right{border-color:#2f9e6a;background:rgba(47,158,106,.08)}
.page .opt.right .b{background:#2f9e6a;border-color:#2f9e6a;color:#fff}
.page .opt.wrong{border-color:#c0504d;background:rgba(192,80,77,.07)}
.page .opt.wrong .b{background:#c0504d;border-color:#c0504d;color:#fff}
.page .bubbles{display:flex;gap:16px;justify-content:center;margin:16px 0}
.page .bubbles button{width:54px;height:54px;border-radius:50%;border:2px solid var(--ink);background:transparent;font-family:var(--sans);font-weight:700;font-size:17px;color:var(--ink)}
.page .bubbles button.sel{background:var(--ink);color:var(--paper)}
.page .bubbles button.right{background:#2f9e6a;border-color:#2f9e6a;color:#fff}
.page .bubbles button.wrong{background:#c0504d;border-color:#c0504d;color:#fff}
.page .passage{border:1px solid var(--ink);padding:16px 18px;margin:8px 0 20px;background:#fff;font-size:16px}
.page .passage .memo{font-family:var(--sans);font-size:14px;border-bottom:1px solid var(--rule);padding-bottom:8px}
.page .passage .blank{display:inline-block;min-width:74px;border-bottom:1.5px solid var(--ink);text-align:center;font-family:var(--sans);font-size:13px;font-weight:700}
.page .passage .ad{text-align:center}
.page .passage .ad h4{font-family:var(--sans);font-size:20px;font-weight:800;letter-spacing:.04em}
.page .passage .ad-sub{font-style:italic;margin-top:0}
.page .passage .ad-foot{font-family:var(--sans);font-size:12px;color:var(--ink2)}
.page .passage .chat p{margin:0 0 10px;padding:8px 12px;border-left:3px solid var(--rule)}
.page .part-label{font-family:var(--sans);font-size:11px;letter-spacing:.14em;color:var(--ink2);text-transform:uppercase}
.page .explain{font-family:var(--sans);font-size:14px;line-height:1.6;color:#2b2f35;background:#eef6f3;border:1px solid #cfe5db;border-radius:8px;padding:12px 14px;margin:6px 0 16px}
.page .explain .tr{font-family:var(--serif);color:#333;margin-top:6px;font-size:14px}
.page .center{text-align:center}
.page .bigbtn{font-family:var(--sans)}

/* listening status */
.listen{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(84px + var(--safe-b));z-index:60;display:flex;align-items:center;gap:12px;padding:10px 16px;border-radius:99px;background:#0d1015;color:var(--text);border:1px solid var(--line2);box-shadow:0 10px 40px -10px rgba(0,0,0,.8);font-size:13px;white-space:nowrap}
.wave{display:flex;gap:3px;align-items:center;height:16px}
.wave i{width:3px;height:6px;border-radius:2px;background:var(--beam);animation:wv 1s infinite ease-in-out}
.wave i:nth-child(2){animation-delay:.15s}.wave i:nth-child(3){animation-delay:.3s}.wave i:nth-child(4){animation-delay:.45s}
.wave.idle i{animation:none;opacity:.35}
@keyframes wv{50%{height:16px}}
.count{font-variant-numeric:tabular-nums;color:var(--gold)}

/* exam footer + answer sheet */
.exam-foot{position:fixed;left:0;right:0;bottom:0;z-index:55;display:flex;gap:10px;align-items:center;justify-content:space-between;padding:10px 16px calc(10px + var(--safe-b));background:#0d1015;border-top:1px solid var(--line);color:var(--text)}
.sheet{position:fixed;inset:auto 0 0 0;z-index:70;max-height:70dvh;overflow:auto;background:#fbfaf6;color:var(--ink);border-radius:18px 18px 0 0;padding:18px 16px calc(18px + var(--safe-b));box-shadow:0 -20px 60px rgba(0,0,0,.5);transform:translateY(105%);transition:transform .25s}
.sheet.open{transform:none}
.sheet h3{font-size:14px;letter-spacing:.12em;text-transform:uppercase;margin-bottom:12px;font-weight:700}
.sheet .grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:6px 14px}
.sheet .r{display:flex;align-items:center;gap:5px;font-size:12px;font-family:var(--sans);cursor:pointer;padding:2px 4px;border-radius:6px}
.sheet .r.cur{background:rgba(0,0,0,.06)}
.sheet .r .n{width:26px;text-align:right;font-weight:700;margin-right:3px}
.sheet .r i{width:18px;height:18px;border-radius:50%;border:1.3px solid #444;display:grid;place-items:center;font-style:normal;font-size:9px;color:#444}
.sheet .r i.on{background:#111;color:#fff;border-color:#111}
.scrim{position:fixed;inset:0;z-index:65;background:rgba(0,0,0,.45)}

/* ---------- result ---------- */
.parts{display:grid;grid-template-columns:repeat(7,1fr);gap:8px}
.parts>div{text-align:center;padding:12px 4px;border:1px solid var(--line);border-radius:12px;background:var(--card)}
.parts>div>b{display:block;font-size:18px;font-weight:400}
.parts>div>span{font-size:11px;color:var(--faint)}
@media (max-width:640px){.parts{grid-template-columns:repeat(4,1fr)}}

.toast{position:fixed;left:50%;top:16px;transform:translateX(-50%);z-index:100;background:var(--card2);border:1px solid var(--line2);padding:10px 16px;border-radius:12px;font-size:14px;box-shadow:0 10px 30px rgba(0,0,0,.5)}
.empty{padding:28px;text-align:center;color:var(--muted);border:1px dashed var(--line2);border-radius:var(--r)}
.fade{animation:fade .35s ease}
@keyframes fade{from{opacity:0;transform:translateY(6px)}}

/* in-app dialog */
.dlg-wrap{position:fixed;inset:0;z-index:200;background:rgba(0,0,0,.55);display:grid;place-items:center;padding:16px}
.dlg{width:100%;max-width:360px;background:var(--card2);border:1px solid var(--line2);border-radius:16px;padding:20px;color:var(--text);box-shadow:0 30px 80px rgba(0,0,0,.6);font-family:var(--sans)}
.dlg p{margin:0 0 18px;line-height:1.6}
.dlg-row{display:flex;gap:10px;justify-content:flex-end}
.btn.danger{background:var(--bad);color:#1b0606;border-color:transparent}
.btn:focus-visible,.opt:focus-visible,.bubbles button:focus-visible{outline:2px solid var(--beam);outline-offset:2px}