/* MBUSLC QuizPlay - base stylesheet (Thai-first, responsive) */
:root{
  --bg:#0f1226; --bg-soft:#171a35; --card:#1e2142; --card-2:#262a52;
  --line:#33386b; --text:#e8e9f5; --muted:#a2a7d0; --brand:#6d5efc; --brand-2:#00c2a8;
  --ok:#22c55e; --warn:#f59e0b; --bad:#ef4444;
  --r1:#e21b3c; --r2:#1368ce; --r3:#d89e00; --r4:#26890c;
  --radius:14px; --shadow:0 10px 30px rgba(0,0,0,.28);
  --font:'Prompt','Sarabun',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6;font-size:16px}
a{color:var(--brand-2);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto}
h1,h2,h3,h4{line-height:1.3;margin:.2em 0 .5em}
.container{max-width:1120px;margin:0 auto;padding:24px 18px}
.container-narrow{max-width:720px;margin:0 auto;padding:24px 18px}

/* nav */
.nav{background:var(--bg-soft);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:40}
.nav-inner{max-width:1120px;margin:0 auto;display:flex;align-items:center;gap:18px;padding:12px 18px;flex-wrap:wrap}
.nav .brand{font-weight:700;font-size:18px;color:var(--text)}
.nav .brand span{color:var(--brand)}
.nav a.link{color:var(--muted);font-size:15px}
.nav a.link.active,.nav a.link:hover{color:var(--text)}
.nav .spacer{flex:1}
.nav .who{font-size:13px;color:var(--muted)}

/* cards / layout */
.grid{display:grid;gap:16px}
.grid.cols-2{grid-template-columns:repeat(2,1fr)}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
.grid.cols-4{grid-template-columns:repeat(4,1fr)}
@media(max-width:820px){.grid.cols-2,.grid.cols-3,.grid.cols-4{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.card h3{margin-top:0}
.stat{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px}
.stat .n{font-size:30px;font-weight:700}
.stat .l{color:var(--muted);font-size:13px}
.muted{color:var(--muted)}
.right{text-align:right}
.center{text-align:center}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.between{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.tag{display:inline-block;padding:2px 9px;border-radius:999px;font-size:12px;background:var(--card-2);border:1px solid var(--line);color:var(--muted)}
.tag.ok{color:#062;background:#bbf7d0;border-color:#bbf7d0}
.tag.live{color:#fff;background:var(--bad);border-color:var(--bad)}

/* forms */
label{display:block;font-size:14px;font-weight:600;margin:12px 0 4px}
input[type=text],input[type=password],input[type=email],input[type=number],input[type=datetime-local],select,textarea{
  width:100%;padding:10px 12px;border-radius:10px;border:1px solid var(--line);background:var(--bg-soft);color:var(--text);font-family:inherit;font-size:15px}
textarea{min-height:90px;resize:vertical}
.check{display:flex;align-items:center;gap:8px;margin:8px 0;font-weight:400}
.check input{width:auto}
.help{font-size:12px;color:var(--muted);margin-top:3px}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border-radius:10px;border:1px solid var(--line);
  background:var(--card-2);color:var(--text);font-family:inherit;font-size:15px;font-weight:600;cursor:pointer;transition:.15s}
.btn:hover{border-color:var(--brand);text-decoration:none}
.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff}
.btn.accent{background:var(--brand-2);border-color:var(--brand-2);color:#04231f}
.btn.ghost{background:transparent}
.btn.danger{background:var(--bad);border-color:var(--bad);color:#fff}
.btn.lg{padding:14px 26px;font-size:18px}
.btn.block{display:flex;width:100%;justify-content:center}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* tables */
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{padding:9px 10px;border-bottom:1px solid var(--line);text-align:left}
th{color:var(--muted);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.03em}
tbody tr:hover{background:var(--bg-soft)}
.table-wrap{overflow-x:auto}

/* flash */
.flash{padding:12px 16px;border-radius:10px;margin-bottom:14px;font-size:14px}
.flash.success{background:#052e1a;border:1px solid #14532d;color:#86efac}
.flash.error{background:#3a0a0a;border:1px solid #7f1d1d;color:#fca5a5}

/* auth / bare */
.bare{min-height:100vh;display:flex;flex-direction:column}
.bare-main{flex:1;display:flex;align-items:center;justify-content:center;padding:24px}
.auth-card{width:100%;max-width:400px;background:var(--card);border:1px solid var(--line);border-radius:20px;padding:30px;box-shadow:var(--shadow)}
.divider{display:flex;align-items:center;gap:12px;color:var(--muted);font-size:13px;margin:16px 0}
.divider::before,.divider::after{content:"";flex:1;height:1px;background:var(--line)}
.btn-google{display:flex;align-items:center;justify-content:center;gap:10px;background:#fff;color:#1f2937;border:0;width:100%;padding:12px;border-radius:10px;font-weight:600;cursor:pointer}

/* -------- game host / play screens -------- */
.stage{min-height:100vh;display:flex;flex-direction:column;background:radial-gradient(1200px 600px at 50% -10%,#2a2f66,var(--bg))}
.stage-top{display:flex;justify-content:space-between;align-items:center;padding:14px 20px;font-weight:600}
.stage-body{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:20px;text-align:center;gap:22px}
.pin-box{background:#fff;color:#111;border-radius:18px;padding:18px 30px;display:inline-block}
.pin-box .label{font-size:13px;color:#555;letter-spacing:.2em}
.pin-box .pin{font-size:52px;font-weight:800;letter-spacing:.12em}
.qr-box{background:#fff;padding:14px;border-radius:16px;display:inline-block}
.qr-box img{display:block;width:220px;height:220px}
.question-stem{font-size:clamp(22px,4vw,40px);font-weight:700;max-width:1000px}
.timer{font-size:44px;font-weight:800}
.answers{display:grid;grid-template-columns:1fr 1fr;gap:14px;width:100%;max-width:900px}
@media(max-width:640px){.answers{grid-template-columns:1fr}}
.answer{border:0;border-radius:14px;padding:20px;font-size:18px;font-weight:700;color:#fff;cursor:pointer;text-align:left;display:flex;gap:12px;align-items:center;min-height:76px;font-family:inherit}
.answer .sym{width:34px;height:34px;flex:0 0 34px;display:grid;place-items:center;background:rgba(255,255,255,.25);border-radius:8px}
.answer.c0{background:var(--r1)} .answer.c1{background:var(--r2)} .answer.c2{background:var(--r3)} .answer.c3{background:var(--r4)}
.answer.c4{background:#8e44ad} .answer.c5{background:#16a085}
.answer.dim{opacity:.35} .answer.pick{outline:4px solid #fff}
.answer.correct{box-shadow:0 0 0 4px #fff, 0 0 0 10px var(--ok)}
.answer.wrong{box-shadow:0 0 0 4px #fff, 0 0 0 10px var(--bad)}
.bar{height:10px;background:var(--card-2);border-radius:999px;overflow:hidden}
.bar > i{display:block;height:100%;background:var(--brand)}
.lb{width:100%;max-width:560px;display:flex;flex-direction:column;gap:8px}
.lb .item{display:flex;justify-content:space-between;align-items:center;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:12px 16px;font-weight:600}
.lb .item .rank{color:var(--brand-2);margin-right:10px}
.big-feedback{font-size:clamp(28px,6vw,54px);font-weight:800}
.count-chip{background:var(--card);border:1px solid var(--line);border-radius:999px;padding:6px 16px;font-weight:700}

.qeditor .option-row{display:flex;gap:8px;align-items:flex-start;margin:8px 0;flex-wrap:wrap}
.qeditor .option-row .idx{width:30px;height:42px;display:grid;place-items:center;border-radius:8px;color:#fff;font-weight:700;flex:0 0 30px}
.qeditor .opt-thumb:empty{display:none}
.qeditor .opt-img{white-space:nowrap}
@media(max-width:640px){.qeditor .option-row > label.check,.qeditor .option-row > button{margin-top:4px}}
.pill-toggle{display:flex;gap:6px;flex-wrap:wrap}
.pill-toggle button{padding:8px 14px;border-radius:999px;border:1px solid var(--line);background:var(--card-2);color:var(--text);cursor:pointer;font-family:inherit}
.pill-toggle button.on{background:var(--brand);border-color:var(--brand);color:#fff}
.hidden{display:none!important}
footer.foot{padding:20px;text-align:center;color:var(--muted);font-size:13px}