:root{--teal:#0d9488;--teal-dark:#0b7c74;--teal-light:#e6f7f5;--ink:#0f172a;--muted:#64748b;--line:#e2e8f0;--bg:#f6f8f8;--card:#fff;--navy:#1e3a5f;--green:#16a34a;--orange:#ea580c;--sky:#0284c7;--red:#dc2626;--amber:#d97706}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:Poppins,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;background:var(--bg);color:var(--ink);font-size:15px;line-height:1.5}
a{color:var(--teal);text-decoration:none}
button{font-family:inherit;cursor:pointer}
input,select,textarea{font-family:inherit;font-size:14px;padding:10px 12px;border:1px solid var(--line);border-radius:10px;width:100%;background:#fff}
input:focus,select:focus,textarea:focus{outline:2px solid #99f6e4;border-color:var(--teal)}
label{font-size:13px;font-weight:600;color:#334155;display:block;margin:0 0 5px}
.btn{background:var(--teal);color:#fff;border:0;border-radius:10px;padding:11px 18px;font-weight:600;font-size:14px}
.btn:hover{background:var(--teal-dark)}
.btn.ghost{background:#fff;color:var(--teal);border:1px solid var(--teal)}
.btn.light{background:var(--teal-light);color:var(--teal-dark)}
.btn.danger{background:var(--red)}
.btn.sm{padding:7px 12px;font-size:13px}
.btn:disabled{opacity:.55;cursor:not-allowed}
.hidden{display:none!important}
.muted{color:var(--muted)} .small{font-size:13px} .bold{font-weight:700}
.center{text-align:center} .mt{margin-top:16px} .mb{margin-bottom:16px}
/* Auth */
.auth-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}
.auth-card{background:#fff;border:1px solid var(--line);border-radius:20px;max-width:440px;width:100%;padding:32px 28px;box-shadow:0 10px 30px rgba(15,23,42,.08)}
.auth-card .logo{width:96px;height:96px;object-fit:contain;display:block;margin:0 auto 8px}
.auth-card h1{text-align:center;margin:6px 0 2px;font-size:26px}
.auth-card p.sub{text-align:center;color:var(--muted);margin:0 0 20px}
.tabs{display:flex;background:#f1f5f9;border-radius:10px;padding:4px;margin-bottom:18px}
.tabs button{flex:1;border:0;background:transparent;padding:10px;border-radius:8px;font-weight:600;color:var(--muted)}
.tabs button.active{background:#fff;color:var(--teal);box-shadow:0 1px 4px rgba(0,0,0,.1)}
.field{margin-bottom:14px}
.auth-foot{text-align:center;margin-top:20px;font-size:13px;color:var(--muted)}
.msg{border-radius:10px;padding:10px 12px;font-size:14px;margin-bottom:14px}
.msg.err{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}
.msg.ok{background:#f0fdf4;color:#166534;border:1px solid #bbf7d0}
.msg.info{background:#eff6ff;color:#1e40af;border:1px solid #bfdbfe}
/* Onboarding */
.ob-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}
.ob-card{background:#fff;border-radius:20px;max-width:620px;width:100%;padding:30px;box-shadow:0 10px 30px rgba(15,23,42,.08)}
.ob-steps{display:flex;gap:6px;margin-bottom:20px}
.ob-steps span{flex:1;height:6px;border-radius:3px;background:#e2e8f0}
.ob-steps span.on{background:var(--teal)}
.preset-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:14px}
.preset{border:2px solid var(--line);border-radius:12px;padding:12px;text-align:left;background:#fff}
.preset.sel{border-color:var(--teal);background:var(--teal-light)}
.preset b{display:block}.preset small{color:var(--muted)}
/* App shell */
.shell{display:flex;min-height:100vh}
.sidebar{width:248px;background:#0f2e2b;color:#e2e8f0;position:fixed;top:0;bottom:0;left:0;display:flex;flex-direction:column;z-index:20}
.side-head{display:flex;align-items:center;gap:10px;padding:18px 16px;border-bottom:1px solid rgba(255,255,255,.12)}
.side-head img{width:42px;height:42px;object-fit:contain;background:#fff;border-radius:10px;padding:2px}
.side-head b{font-size:18px;color:#fff;display:block;line-height:1.1}
.side-head small{color:#99f6e4;font-size:11px}
.side-nav{flex:1;overflow-y:auto;padding:10px 8px}
.side-nav button{display:flex;align-items:center;gap:10px;width:100%;border:0;background:transparent;color:#cbd5e1;padding:9px 10px;border-radius:9px;font-size:14px;text-align:left;margin-bottom:2px}
.side-nav button:hover{background:rgba(255,255,255,.08);color:#fff}
.side-nav button.active{background:var(--teal);color:#fff}
.side-nav .ico{width:22px;text-align:center;flex-shrink:0}
.side-foot{padding:12px;border-top:1px solid rgba(255,255,255,.12);font-size:12px;color:#94a3b8}
.main{flex:1;margin-left:248px;padding:24px;max-width:1100px;width:calc(100% - 248px)}
.topbar{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:18px;flex-wrap:wrap}
.topbar h2{margin:0;font-size:24px}
.pill{display:inline-block;padding:3px 10px;border-radius:999px;font-size:12px;font-weight:700;background:var(--teal-light);color:var(--teal-dark)}
.pill.navy{background:#dbeafe;color:var(--navy)} .pill.green{background:#dcfce7;color:#166534}
.pill.orange{background:#ffedd5;color:#9a3412} .pill.sky{background:#e0f2fe;color:#075985}
.pill.red{background:#fee2e2;color:#991b1b} .pill.amber{background:#fef3c7;color:#92400e}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px;margin-bottom:16px}
.grid{display:grid;gap:16px}
.g2{grid-template-columns:1fr 1fr}.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}
.stat b{font-size:28px;display:block}.stat span{color:var(--muted);font-size:13px}
.skill-listening{border-top:4px solid var(--navy)} .skill-reading{border-top:4px solid var(--green)}
.skill-speaking{border-top:4px solid var(--orange)} .skill-writing{border-top:4px solid var(--sky)}
.tile{cursor:pointer}.tile:hover{border-color:var(--teal)}
.qrow{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:13px 14px;border:1px solid var(--line);border-radius:12px;margin-bottom:8px;background:#fff;cursor:pointer}
.qrow:hover{border-color:var(--teal);background:#f0fdfa}
.chip{display:inline-block;padding:2px 9px;border-radius:999px;font-size:12px;font-weight:600;background:#f1f5f9;color:#475569;margin-right:4px}
.filters{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.filters select,.filters input{width:auto;flex:1;min-width:140px}
.rules{background:#fffbeb;border:1px solid #fde68a;border-radius:12px;padding:14px 16px;margin-bottom:16px}
.rules h4{margin:0 0 6px;color:#92400e}
.rules ul{margin:0;padding-left:20px}
.timer{font-size:22px;font-weight:800;font-variant-numeric:tabular-nums}
.timer.low{color:var(--red)}
.score-big{font-size:44px;font-weight:800}
.score-good{color:var(--green)} .score-mid{color:var(--amber)} .score-low{color:var(--red)}
.review-correct{color:#15803d;font-weight:600} .review-wrong{color:#b91c1c;font-weight:600}
.word-ok{color:#15803d} .word-bad{color:#dc2626;text-decoration:underline}
.blank-orange{color:var(--orange);font-weight:800}
.lock{font-size:22px}
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{padding:9px 8px;border-bottom:1px solid var(--line);text-align:left}
th{background:#f8fafc}
.plan-card{border:2px solid var(--line);border-radius:16px;padding:20px;text-align:center;position:relative}
.plan-card.popular{border-color:var(--teal);box-shadow:0 6px 20px rgba(13,148,136,.15)}
.strike{text-decoration:line-through;color:var(--muted)}
.off-badge{background:var(--red);color:#fff;border-radius:999px;padding:3px 10px;font-size:12px;font-weight:700}
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px}
.thumb{border:1px solid var(--line);border-radius:12px;padding:10px;cursor:pointer;background:#fff}
.thumb:hover{border-color:var(--teal)}
.thumb svg{width:100%;height:auto}
.lightbox{position:fixed;inset:0;background:rgba(0,0,0,.85);z-index:100;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:20px;color:#fff}
.lightbox .box{background:#fff;color:var(--ink);border-radius:16px;padding:20px;max-width:900px;width:100%;max-height:85vh;overflow:auto}
.accordion{border:1px solid var(--line);border-radius:12px;margin-bottom:8px;overflow:hidden}
.accordion button{width:100%;text-align:left;background:#fff;border:0;padding:14px;font-weight:600;font-size:15px}
.accordion .body{padding:0 14px 14px;display:none}
.accordion.open .body{display:block}
.level-bar{height:10px;background:#e2e8f0;border-radius:5px;overflow:hidden;margin:8px 0}
.level-fill{height:100%;background:var(--teal);transition:width .2s}
.ring-wrap{display:flex;gap:16px;flex-wrap:wrap;justify-content:center}
.admin-table{overflow-x:auto}
@media(max-width:900px){
  .g4{grid-template-columns:1fr 1fr}.g3{grid-template-columns:1fr 1fr}.g2{grid-template-columns:1fr}
  .sidebar{width:64px}.side-head b,.side-head small,.side-nav button span.lbl,.side-foot{display:none}
  .side-nav button{justify-content:center;padding:11px 0}.main{margin-left:64px;width:calc(100% - 64px);padding:16px}
}
@media(max-width:560px){.g4,.g3{grid-template-columns:1fr}.auth-card,.ob-card{padding:22px 18px}}