/* =============================================
   แบบทดสอบคอมพิวเตอร์ — Premium Dark Theme
   ============================================= */
:root {
  --bg: #080c18;
  --bg2: #0f1623;
  --glass: rgba(255,255,255,0.04);
  --border: rgba(255,255,255,0.08);
  --text: #eef2ff;
  --sub: #94a3b8;
  --muted: #4b5563;
  --purple: #7c3aed;
  --indigo: #6366f1;
  --blue: #3b82f6;
  --green: #10b981;
  --red: #ef4444;
  --green-bg: rgba(16,185,129,0.12);
  --green-bd: rgba(16,185,129,0.35);
  --red-bg: rgba(239,68,68,0.12);
  --red-bd: rgba(239,68,68,0.35);
  --grad: linear-gradient(135deg,#7c3aed,#6366f1,#3b82f6);
  --glow: rgba(124,58,237,0.25);
  --r: 14px; --r-sm: 10px;
  --t: 0.28s cubic-bezier(.4,0,.2,1);
}

*{margin:0;padding:0;box-sizing:border-box}

body {
  font-family:'Noto Sans Thai','Inter',sans-serif;
  background:var(--bg);
  color:var(--text);
  min-height:100vh;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}

/* Background orbs */
.bg-orbs{position:fixed;inset:0;pointer-events:none;z-index:0;overflow:hidden}
.orb{position:absolute;border-radius:50%;filter:blur(90px);opacity:.3;animation:float 22s ease-in-out infinite}
.orb-1{width:520px;height:520px;background:#7c3aed;top:-12%;left:-8%;animation-delay:0s}
.orb-2{width:420px;height:420px;background:#3b82f6;bottom:-12%;right:-6%;animation-delay:-8s}
.orb-3{width:320px;height:320px;background:#6366f1;top:38%;left:48%;animation-delay:-15s}
@keyframes float{
  0%,100%{transform:translate(0,0) scale(1)}
  33%{transform:translate(28px,-36px) scale(1.06)}
  66%{transform:translate(-18px,28px) scale(.94)}
}

/* Layout */
#app{position:relative;z-index:1}
.container{max-width:780px;margin:0 auto;padding:0 18px}
.page{display:none;min-height:100vh;padding:16px 0 40px}
.page.active{display:block;animation:fadeUp .45s ease}
@keyframes fadeUp{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:translateY(0)}}
.hidden{display:none!important}

/* Back button */
.back-btn{
  display:inline-flex;align-items:center;gap:6px;
  padding:8px 16px;
  background:var(--glass);border:1px solid var(--border);
  border-radius:100px;color:var(--sub);font-size:14px;font-weight:500;
  cursor:pointer;transition:all var(--t);font-family:inherit;
  margin-bottom:8px;
}
.back-btn svg{width:18px;height:18px}
.back-btn:hover{background:rgba(255,255,255,.08);color:var(--text)}

/* ===== HOME ===== */
.hero{text-align:center;padding:56px 0 36px}
.badge{
  display:inline-block;padding:6px 16px;
  background:var(--glass);border:1px solid var(--border);
  border-radius:100px;font-size:13px;color:var(--sub);
  margin-bottom:20px;letter-spacing:.5px;font-weight:500;
}
.hero h1{font-size:clamp(2.1rem,6vw,3.4rem);font-weight:900;line-height:1.2;margin-bottom:14px}
.grad{background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.subtitle{font-size:15px;color:var(--sub);max-width:460px;margin:0 auto}

/* Category grid */
.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:14px;padding-bottom:40px}
.cat-card{
  background:var(--glass);border:1px solid var(--border);
  border-radius:var(--r);padding:22px 20px;cursor:pointer;
  transition:all var(--t);backdrop-filter:blur(14px);
  position:relative;overflow:hidden;
}
.cat-card::after{
  content:'';position:absolute;top:0;left:0;right:0;height:2.5px;
  background:var(--grad);opacity:0;transition:opacity var(--t);
}
.cat-card:hover{transform:translateY(-4px);border-color:rgba(124,58,237,.3);box-shadow:0 12px 40px rgba(124,58,237,.14)}
.cat-card:hover::after{opacity:1}
.cat-card:active{transform:translateY(-2px) scale(.98)}
.cat-icon{font-size:34px;margin-bottom:12px;display:block}
.cat-name{font-size:14px;font-weight:700;line-height:1.4;margin-bottom:8px}
.cat-meta{font-size:12px;color:var(--muted);display:flex;gap:12px}

/* ===== SETS ===== */
.sec-header{text-align:center;padding:36px 0 28px}
.sec-icon{font-size:46px;margin-bottom:10px}
.sec-header h2{font-size:1.6rem;font-weight:800;margin-bottom:6px}
.sec-sub{font-size:14px;color:var(--sub)}
.set-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px;padding-bottom:40px}
.set-card{
  background:var(--glass);border:1px solid var(--border);
  border-radius:var(--r-sm);padding:18px 22px;cursor:pointer;
  display:flex;align-items:center;justify-content:space-between;
  transition:all var(--t);backdrop-filter:blur(12px);
}
.set-card:hover{transform:translateY(-2px);border-color:rgba(99,102,241,.3);box-shadow:0 8px 28px rgba(99,102,241,.12)}
.set-card:active{transform:scale(.98)}
.set-name{font-size:15px;font-weight:600}
.set-count{font-size:12px;color:var(--muted);margin-top:3px}
.set-arr{color:var(--muted);font-size:18px;transition:transform var(--t)}
.set-card:hover .set-arr{transform:translateX(4px);color:var(--purple)}

/* ===== QUIZ ===== */
.quiz-wrap{max-width:680px}
.quiz-topbar{display:flex;align-items:center;gap:12px;margin-bottom:18px;flex-wrap:wrap}
.quiz-meta{flex:1;display:flex;flex-direction:column;gap:2px;min-width:0}
.qz-catname{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.qz-setname{font-size:14px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.scorebox{
  display:flex;align-items:baseline;gap:2px;
  background:var(--glass);border:1px solid var(--border);
  border-radius:100px;padding:6px 16px;font-weight:700;flex-shrink:0;
}
.sc-right{color:var(--green);font-size:18px}
.sc-sep{color:var(--muted);font-size:13px}
.sc-done{color:var(--sub);font-size:13px}

/* Progress */
.prog-wrap{position:relative;height:5px;background:rgba(255,255,255,.05);border-radius:100px;margin-bottom:22px;overflow:hidden}
.prog-bar{height:100%;background:var(--grad);border-radius:100px;width:0;transition:width .5s cubic-bezier(.4,0,.2,1)}
.prog-label{position:absolute;right:0;top:-20px;font-size:12px;color:var(--muted);font-weight:500}

/* Question card */
.q-card{
  background:var(--glass);border:1px solid var(--border);
  border-radius:var(--r);padding:26px 24px;
  backdrop-filter:blur(18px);animation:slideR .38s ease;
}
@keyframes slideR{from{opacity:0;transform:translateX(18px)}to{opacity:1;transform:translateX(0)}}
.q-num{font-size:12px;font-weight:700;color:var(--purple);text-transform:uppercase;letter-spacing:1px;margin-bottom:10px}
.q-text{font-size:16px;font-weight:600;line-height:1.75;margin-bottom:22px}

/* Choices */
.choices{display:flex;flex-direction:column;gap:10px}
.choice{
  display:flex;align-items:flex-start;gap:13px;width:100%;
  padding:13px 16px;
  background:rgba(255,255,255,.03);border:1.5px solid rgba(255,255,255,.07);
  border-radius:var(--r-sm);color:var(--text);font-size:14px;font-weight:500;
  text-align:left;cursor:pointer;transition:all var(--t);
  font-family:inherit;line-height:1.55;
}
.choice:hover:not(.done){
  background:rgba(255,255,255,.06);
  border-color:rgba(124,58,237,.3);
  transform:translateX(4px);
}
.choice:active:not(.done){transform:scale(.99)}
.choice .lbl{
  display:flex;align-items:center;justify-content:center;
  min-width:28px;height:28px;border-radius:7px;
  background:rgba(255,255,255,.06);font-size:13px;font-weight:700;
  color:var(--sub);flex-shrink:0;transition:all var(--t);
}
.choice .ctxt{flex:1;padding-top:2px}

/* correct */
.choice.correct{background:var(--green-bg);border-color:var(--green-bd);animation:pop .5s ease}
.choice.correct .lbl{background:var(--green);color:#fff}
@keyframes pop{0%{transform:scale(1)}35%{transform:scale(1.025)}100%{transform:scale(1)}}

/* wrong */
.choice.wrong{background:var(--red-bg);border-color:var(--red-bd);animation:shake .45s ease}
.choice.wrong .lbl{background:var(--red);color:#fff}
@keyframes shake{
  0%,100%{transform:translateX(0)}
  20%{transform:translateX(-8px)}40%{transform:translateX(7px)}
  60%{transform:translateX(-4px)}80%{transform:translateX(2px)}
}

.choice.done{cursor:default;opacity:.45}
.choice.correct.done,.choice.wrong.done{opacity:1}

/* Explanation */
.expl{
  margin-top:18px;padding:16px;
  background:rgba(99,102,241,.06);border:1px solid rgba(99,102,241,.15);
  border-radius:var(--r-sm);animation:fadeUp .35s ease;
}
.expl-head{
  display:flex;align-items:center;gap:7px;
  font-size:12px;font-weight:700;color:var(--indigo);
  text-transform:uppercase;letter-spacing:.5px;margin-bottom:8px;
}
.expl-text{font-size:13.5px;color:var(--sub);line-height:1.8}

/* Nav */
.q-nav{display:flex;justify-content:space-between;gap:10px;margin-top:20px}
.nbtn{
  display:inline-flex;align-items:center;gap:6px;
  padding:11px 22px;border-radius:100px;font-size:14px;font-weight:600;
  cursor:pointer;transition:all var(--t);font-family:inherit;
  border:1.5px solid var(--border);background:var(--glass);color:var(--sub);
}
.nbtn svg{width:17px;height:17px}
.nbtn:hover:not(:disabled){background:rgba(255,255,255,.08);color:var(--text)}
.nbtn:disabled{opacity:.3;cursor:not-allowed}
.nbtn-next{background:var(--grad);border:none;color:#fff}
.nbtn-next:hover:not(:disabled){box-shadow:0 4px 20px var(--glow);transform:translateY(-1px)}
.nbtn-finish{background:linear-gradient(135deg,#10b981,#059669);border:none;color:#fff;margin-left:auto}
.nbtn-finish:hover{box-shadow:0 4px 20px rgba(16,185,129,.3);transform:translateY(-1px)}

/* ===== RESULT ===== */
.result-card{
  text-align:center;padding:52px 28px 36px;
  background:var(--glass);border:1px solid var(--border);
  border-radius:var(--r);backdrop-filter:blur(18px);margin-top:36px;
}
.result-emoji{font-size:60px;margin-bottom:10px}
.result-title{font-size:1.75rem;font-weight:900;margin-bottom:28px}

/* Ring */
.ring-wrap{position:relative;width:136px;height:136px;margin:0 auto 26px}
.ring-svg{width:100%;height:100%;transform:rotate(-90deg)}
.ring-bg{fill:none;stroke:rgba(255,255,255,.06);stroke-width:8}
.ring-fg{
  fill:none;stroke:url(#rg);stroke-width:8;stroke-linecap:round;
  stroke-dasharray:327;stroke-dashoffset:327;
  transition:stroke-dashoffset 1.4s cubic-bezier(.4,0,.2,1);
}
.ring-text{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);text-align:center}
.ring-num{display:block;font-size:24px;font-weight:900}
.ring-lbl{display:block;font-size:11px;color:var(--muted)}

.result-stats{display:flex;justify-content:center;gap:36px;margin-bottom:28px}
.rstat{text-align:center}
.rstat-val{font-size:26px;font-weight:800}
.rstat-val.green{color:var(--green)}
.rstat-val.red{color:var(--red)}
.rstat-lbl{font-size:12px;color:var(--muted);margin-top:3px}

.result-btns{display:flex;justify-content:center;gap:10px;flex-wrap:wrap}
.btn-main,.btn-sec{
  padding:11px 22px;border-radius:100px;font-size:14px;font-weight:600;
  cursor:pointer;transition:all var(--t);font-family:inherit;border:none;
}
.btn-main{background:var(--grad);color:#fff}
.btn-main:hover{box-shadow:0 4px 20px var(--glow);transform:translateY(-2px)}
.btn-sec{background:var(--glass);border:1.5px solid var(--border);color:var(--sub)}
.btn-sec:hover{background:rgba(255,255,255,.08);color:var(--text)}

/* Review */
.review{margin-top:28px;padding-bottom:60px}
.review-title{font-size:1.2rem;font-weight:700;text-align:center;margin-bottom:16px}
.rv-item{
  background:var(--glass);border:1px solid var(--border);border-radius:var(--r-sm);
  padding:18px;margin-bottom:10px;border-left:3px solid var(--muted);
}
.rv-item.ok{border-left-color:var(--green)}
.rv-item.bad{border-left-color:var(--red)}
.rv-num{font-size:11px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.5px;margin-bottom:5px}
.rv-q{font-size:14px;font-weight:600;line-height:1.6;margin-bottom:10px}
.rv-ans{font-size:13px;padding:7px 11px;border-radius:6px;margin-bottom:4px;line-height:1.5}
.rv-ans.ok{background:var(--green-bg);color:var(--green)}
.rv-ans.bad{background:var(--red-bg);color:var(--red);text-decoration:line-through;opacity:.7}
.rv-expl{font-size:13px;color:var(--muted);margin-top:8px;line-height:1.7;padding-left:10px;border-left:2px solid rgba(99,102,241,.2)}

/* Responsive */
@media(max-width:580px){
  .container{padding:0 12px}
  .hero{padding:38px 0 22px}
  .hero h1{font-size:2rem}
  .cat-grid{grid-template-columns:1fr 1fr;gap:10px}
  .cat-card{padding:16px 14px}
  .cat-icon{font-size:28px;margin-bottom:9px}
  .cat-name{font-size:13px}
  .q-card{padding:18px 14px}
  .q-text{font-size:15px}
  .choice{padding:11px 13px;font-size:13px}
  .q-nav{flex-wrap:wrap}
  .nbtn{flex:1;justify-content:center;min-width:90px}
  .result-stats{gap:20px}
  .set-grid{grid-template-columns:1fr}
}

::-webkit-scrollbar{width:5px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:rgba(255,255,255,.1);border-radius:3px}
::-webkit-scrollbar-thumb:hover{background:rgba(255,255,255,.18)}