:root{
  --blue:#0b5cab; --blue-d:#083f77; --blue-l:#1b74c9;
  --ink:#1f2937; --muted:#6b7280; --line:#d7dde5; --bg:#eef1f5;
  --green:#2e7d32; --green-l:#43a047; --red:#c62828; --violet:#6a1b9a;
  --amber:#ef6c00; --shadow:0 2px 10px rgba(0,0,0,.10);
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{font-family:"Segoe UI",Tahoma,Arial,sans-serif;background:var(--bg);color:var(--ink);font-size:14px}
.hidden{display:none!important}
b{font-weight:700}

/* buttons (TCS iON look: gradient, uppercase-ish) */
.btn{border:1px solid rgba(0,0,0,.15);border-radius:4px;padding:8px 14px;cursor:pointer;font-size:13px;
  font-weight:600;color:#fff;background:#607d8b;box-shadow:0 1px 0 rgba(0,0,0,.08);transition:.12s}
.btn:hover{filter:brightness(1.06)}
.btn:active{transform:translateY(1px)}
.btn.green{background:linear-gradient(#57b65a,#3f9e43)}
.btn.red{background:linear-gradient(#e0524b,#c62828)}
.btn.violet{background:linear-gradient(#8e44ad,#6a1b9a)}
.btn.light{background:linear-gradient(#fdfdfd,#e7ecf1);color:#33475b;border-color:#c4ccd6}
.btn.big{padding:12px 26px;font-size:15px}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* ============ PAPER SELECT ============ */
.paper-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:14px;margin-top:18px}
.paper-card{display:flex;align-items:center;gap:14px;text-align:left;background:#fff;border:1px solid var(--line);
  border-radius:8px;padding:16px;cursor:pointer;color:var(--ink);box-shadow:var(--shadow);transition:.12s}
.paper-card:hover{border-color:var(--blue-l);box-shadow:0 4px 16px rgba(11,92,171,.18);transform:translateY(-2px)}
.pc-badge{background:linear-gradient(var(--blue-l),var(--blue-d));color:#fff;font-weight:800;border-radius:8px;
  padding:12px;min-width:56px;text-align:center;font-size:15px}
.pc-body{flex:1;display:flex;flex-direction:column;gap:2px}
.pc-body b{color:var(--blue-d);font-size:15px}
.pc-body span{color:var(--muted);font-size:13px}
.pc-meta{color:#8a94a3;font-size:12px;margin-top:4px}
.pc-go{color:var(--green);font-weight:700;font-size:13px;white-space:nowrap}

/* ============ START ============ */
.screen{max-width:1000px;margin:0 auto;padding:24px}
.card{background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow);padding:28px}
.start-card{margin-top:28px}
.brand-row{display:flex;align-items:center;gap:16px;margin-bottom:18px}
.brand-badge,.eh-badge{background:linear-gradient(var(--blue-l),var(--blue-d));color:#fff;font-weight:800;
  letter-spacing:1px;border-radius:6px;padding:10px 14px;font-size:18px}
.brand-row h1{margin:0;font-size:22px;color:var(--blue-d)}
.sub{margin:2px 0 0;color:var(--muted)}
.meta-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px;margin:16px 0}
.meta-grid .m{background:#f2f6fb;border:1px solid #e0e8f1;border-radius:6px;padding:10px 12px}
.meta-grid .m b{display:block;font-size:17px;color:var(--blue-d)}
.meta-grid .m span{color:var(--muted);font-size:11px;text-transform:uppercase;letter-spacing:.04em}
.instr-box{border:1px solid var(--line);border-radius:6px;padding:14px 18px;background:#fbfcfe}
.instr-box h3{margin:0 0 8px;color:var(--blue-d)}
.instructions{margin:0;padding-left:20px;line-height:1.8;color:#374151}
.start-actions{display:flex;justify-content:space-between;align-items:center;gap:14px;margin-top:20px;flex-wrap:wrap}
.timer-opt{color:var(--muted);display:flex;align-items:center;gap:8px}

/* ============ TEST SCREEN ============ */
.screen-full{display:flex;flex-direction:column;height:100vh}
.exam-header{background:linear-gradient(var(--blue-l),var(--blue));color:#fff;display:flex;
  justify-content:space-between;align-items:center;padding:8px 16px;box-shadow:var(--shadow);flex-shrink:0}
.eh-left{display:flex;align-items:center;gap:12px}
.eh-badge{font-size:15px;padding:6px 10px}
.eh-title{font-weight:600}
.time-box{display:flex;align-items:center;gap:10px;background:rgba(255,255,255,.15);padding:6px 14px;border-radius:6px}
.time-box span{font-size:12px;opacity:.9}
.time-box b{font-variant-numeric:tabular-nums;font-size:18px;letter-spacing:1px}
.time-box b.warn{color:#ffd54f}

/* section tabs */
.section-tabs{display:flex;gap:2px;background:#dbe3ec;padding:6px 8px 0;overflow-x:auto;flex-shrink:0;
  border-bottom:2px solid var(--blue)}
.stab{white-space:nowrap;padding:8px 14px;border:1px solid #c4ccd6;border-bottom:none;
  border-radius:6px 6px 0 0;background:#eef2f6;color:#37475a;cursor:pointer;font-weight:600;font-size:12.5px}
.stab.active{background:var(--blue);color:#fff;border-color:var(--blue)}
.stab .cnt{opacity:.7;font-weight:500}

/* body split */
.exam-body{display:flex;flex:1;min-height:0}
.q-col{flex:1;display:flex;flex-direction:column;background:#fff;min-width:0}
.q-toolbar{display:flex;justify-content:space-between;align-items:center;padding:10px 18px;
  border-bottom:1px solid var(--line);background:#f7f9fc;flex-wrap:wrap;gap:8px}
.q-title{font-weight:700;font-size:15px;color:var(--blue-d)}
.q-marks{display:flex;align-items:center;gap:10px;font-size:12px}
.mk{padding:3px 8px;border-radius:4px;font-weight:700;color:#fff}
.mk.plus{background:var(--green-l)} .mk.minus{background:#90a4ae}
.lang{color:var(--muted)}

.q-scroll{flex:1;overflow:auto;padding:18px 22px}
.qimage-wrap{border:1px solid var(--line);border-radius:6px;padding:12px;background:#fff}
#qimg{max-width:100%;display:block}
.options{margin-top:18px;display:flex;flex-direction:column;gap:10px;max-width:720px}
.opt{display:flex;align-items:center;gap:12px;border:1px solid #cfd8e3;border-radius:6px;
  padding:11px 14px;cursor:pointer;transition:.1s;background:#fff}
.opt:hover{background:#f0f6ff;border-color:var(--blue-l)}
.opt .box{width:24px;height:24px;border-radius:50%;border:2px solid #b0bcca;display:flex;
  align-items:center;justify-content:center;font-weight:700;font-size:12px;flex-shrink:0}
.opt .lbl{font-weight:600}
.opt.selected{background:#e3f0ff;border-color:var(--blue)}
.opt.selected .box{background:var(--blue);border-color:var(--blue);color:#fff}
.opt.correct{background:#e6f4ea;border-color:var(--green)}
.opt.correct .box{background:var(--green);border-color:var(--green);color:#fff}
.opt.wrong{background:#fdeaea;border-color:var(--red)}
.opt.wrong .box{background:var(--red);border-color:var(--red);color:#fff}
.opt .tag{margin-left:auto;font-size:12px;font-weight:700}
.opt.correct .tag{color:var(--green)} .opt.wrong .tag{color:var(--red)}
.feedback{margin-top:14px;max-width:720px;padding:11px 15px;border-radius:6px;font-weight:700;border:1px solid}
.feedback.ok{background:#e6f4ea;color:var(--green);border-color:var(--green)}
.feedback.no{background:#fdeaea;color:var(--red);border-color:var(--red)}
.feedback.skip{background:#eceff1;color:#546e7a;border-color:#b0bcca}

.action-bar{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:12px 18px;
  border-top:1px solid var(--line);background:#f7f9fc;flex-wrap:wrap}
.ab-left,.ab-right{display:flex;gap:8px;flex-wrap:wrap}

/* palette */
.palette-col{width:280px;flex-shrink:0;background:#f4f7fa;border-left:1px solid var(--line);
  display:flex;flex-direction:column}
.candidate{display:flex;align-items:center;gap:10px;padding:12px;background:#fff;border-bottom:1px solid var(--line)}
.cand-photo{width:44px;height:44px;border-radius:6px;background:#dbe3ec;display:flex;align-items:center;
  justify-content:center;font-size:22px}
.cand-info{display:flex;flex-direction:column}
.cand-info b{color:var(--blue-d)} .cand-info span{color:var(--muted);font-size:12px}
.legend{display:grid;grid-template-columns:1fr 1fr;gap:6px 10px;padding:12px;font-size:11.5px;
  background:#eaf0f6;border-bottom:1px solid var(--line)}
.legend span{display:flex;align-items:center;gap:6px}
.legend b{font-weight:700}
.mark{width:22px;height:22px;flex-shrink:0;display:inline-block;background-size:contain;position:relative}
/* status shapes */
.mark.ans{background:var(--green-l);clip-path:polygon(0 0,100% 0,100% 70%,50% 100%,0 70%);border-radius:3px}
.mark.notans{background:#e53935;clip-path:polygon(0 30%,50% 0,100% 30%,100% 100%,0 100%);border-radius:3px}
.mark.nv{background:#eceff1;border:1px solid #b0bcca;border-radius:3px}
.mark.mrk{background:#7e57c2;border-radius:50%}
.mark.ansmrk{background:#7e57c2;border-radius:50%}
.mark.ansmrk::after{content:"✓";position:absolute;right:-3px;bottom:-3px;width:12px;height:12px;
  background:var(--green);color:#fff;border-radius:50%;font-size:9px;line-height:12px;text-align:center}

.palette-scroll{flex:1;overflow:auto;padding:10px 12px}
.pal-section-title{font-weight:700;color:var(--blue-d);font-size:12px;margin:2px 0 8px;text-transform:uppercase;
  letter-spacing:.03em}
.grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}
.cell{position:relative;width:100%;aspect-ratio:1;border:none;background:#eceff1;border:1px solid #b0bcca;
  color:#37475a;cursor:pointer;font-weight:700;font-size:13px;display:flex;align-items:center;
  justify-content:center;border-radius:3px}
.cell:hover{outline:2px solid var(--blue-l)}
.cell.answered{background:var(--green-l);color:#fff;border-color:var(--green);
  clip-path:polygon(0 0,100% 0,100% 72%,50% 100%,0 72%)}
.cell.notans{background:#e53935;color:#fff;border-color:#c62828;
  clip-path:polygon(0 22%,50% 0,100% 22%,100% 100%,0 100%)}
.cell.marked{background:#7e57c2;color:#fff;border-color:#5e35b1;border-radius:50%}
.cell.ansmarked{background:#7e57c2;color:#fff;border-color:#5e35b1;border-radius:50%}
.cell.ansmarked::after{content:"✓";position:absolute;right:-2px;bottom:-2px;width:14px;height:14px;
  background:var(--green);color:#fff;border-radius:50%;font-size:10px;line-height:14px;text-align:center;
  border:1px solid #fff}
.cell.current{outline:3px solid var(--blue);outline-offset:1px;z-index:2}
/* review palette */
.cell.rcorrect{background:var(--green-l);color:#fff;border-color:var(--green);clip-path:none;border-radius:3px}
.cell.rwrong{background:#e53935;color:#fff;border-color:#c62828;clip-path:none;border-radius:3px}
.cell.rskip{background:#cfd8dc;color:#37475a;clip-path:none;border-radius:3px}
.submit-big{margin:12px;font-size:15px;padding:12px}

/* ============ RESULT ============ */
.result-card{margin-top:24px}
.result-card h1{color:var(--blue-d);margin-top:0}
.score-row{display:flex;gap:12px;flex-wrap:wrap;margin:8px 0 18px}
.score-box{flex:1;min-width:120px;background:#f2f6fb;border:1px solid #e0e8f1;border-radius:8px;padding:16px;text-align:center}
.score-box b{display:block;font-size:28px}
.score-box.good b{color:var(--green)} .score-box.bad b{color:var(--red)}
.score-box span{color:var(--muted);font-size:12px}
.srow{display:flex;align-items:center;gap:12px;padding:9px 0;border-top:1px solid var(--line)}
.srow .name{flex:1;font-weight:600}
.bar{flex:2;height:10px;background:#e2e8f0;border-radius:6px;overflow:hidden}
.bar>i{display:block;height:100%;background:var(--blue-l)}
.srow .val{width:70px;text-align:right;color:var(--muted);font-variant-numeric:tabular-nums}
.result-actions{display:flex;gap:10px;margin-top:20px;flex-wrap:wrap;justify-content:center}
.review-list{max-width:900px;margin:18px auto 60px;display:flex;flex-direction:column;gap:14px}
.review-item{background:#fff;border:1px solid var(--line);border-radius:8px;padding:16px;box-shadow:var(--shadow)}
.review-item .rhead{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.qnum{background:#e3f0ff;color:var(--blue-d);font-weight:800;padding:4px 10px;border-radius:5px}
.qsection{color:var(--muted);font-size:12px}
.badge{padding:3px 10px;border-radius:999px;font-size:12px;font-weight:700}
.badge.ok{background:#e6f4ea;color:var(--green)} .badge.no{background:#fdeaea;color:var(--red)}
.badge.skip{background:#eceff1;color:#546e7a}
.review-item img{max-width:100%;border:1px solid var(--line);border-radius:6px}
.answers-line{margin-top:10px}
.answers-line b.g{color:var(--green)} .answers-line b.r{color:var(--red)}

@media(max-width:820px){
  .exam-body{flex-direction:column}
  .palette-col{width:100%;border-left:none;border-top:1px solid var(--line)}
  .grid{grid-template-columns:repeat(8,1fr)}
}