:root{
  --bg:#0b0b0d; --panel:#141418; --panel-2:#1b1b21; --line:#2a2a33;
  --text:#f2f3f5; --muted:#9a9aa6; --accent:#c6ff3d; --accent-ink:#0b0b0d; --danger:#ff5c5c;
  --ok:#3ddc84; --warn:#ffb020; --radius:18px;
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
html{scroll-behavior:smooth}
html,body{max-width:100%;overflow-x:hidden}
body{background:var(--bg);color:var(--text);font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;line-height:1.55;min-height:100vh;min-height:100dvh;display:flex;flex-direction:column}
body.no-scroll{overflow:hidden}
img,canvas,svg{max-width:100%}
button{font:inherit;color:inherit}
[hidden]{display:none!important}
.muted{color:var(--muted)}
.bg-glow{position:fixed;inset:0;z-index:-1;background:radial-gradient(600px 400px at 85% -5%,rgba(198,255,61,.16),transparent 60%),radial-gradient(500px 400px at -5% 100%,rgba(198,255,61,.07),transparent 60%)}

/* top bar */
.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px clamp(16px,5vw,48px);border-bottom:1px solid var(--line);backdrop-filter:blur(8px);position:sticky;top:0;background:rgba(11,11,13,.82);z-index:20}
.brand-logo{height:52px;width:auto;display:block}
.top-right{display:flex;align-items:center;gap:10px;min-width:0}
.badge{font-size:.75rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);border:1px solid rgba(198,255,61,.35);padding:5px 12px;border-radius:999px;white-space:nowrap}
.userchip{display:flex;align-items:center;gap:8px;min-width:0}
.userchip img,.avatar{width:32px;height:32px;border-radius:50%;object-fit:cover;flex-shrink:0}
.avatar{display:grid;place-items:center;background:rgba(198,255,61,.12);color:var(--accent);font-weight:700;font-size:.8rem}
.userchip span{max-width:110px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:.85rem;color:var(--muted)}

.container{width:100%;max-width:860px;margin:0 auto;padding:36px 16px 32px;flex:1;min-width:0}
.container.wide{max-width:1040px}
.hero{text-align:center;margin-bottom:28px}
.hero h1{font-size:clamp(1.9rem,5.5vw,3.1rem);line-height:1.1;letter-spacing:-.02em;margin-bottom:12px}
.accent{color:var(--accent)}
.hero p{color:var(--muted);max-width:620px;margin:0 auto}
.hero strong{color:var(--text)}

/* cards */
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:clamp(16px,3vw,28px);box-shadow:0 20px 60px rgba(0,0,0,.45);min-width:0;animation:rise .35s ease both}
.card + .card{margin-top:16px}
.card h2{font-size:1.15rem;margin-bottom:4px}
.card .sub{color:var(--muted);font-size:.9rem;margin-bottom:16px}
@keyframes rise{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* buttons */
.btn-primary,.btn-solid{display:inline-flex;justify-content:center;align-items:center;gap:8px;background:var(--accent);color:var(--accent-ink);font-weight:700;font-size:1rem;border:none;border-radius:14px;padding:14px 22px;cursor:pointer;text-decoration:none;transition:.15s;font-family:inherit}
.btn-primary{width:100%;margin-top:20px}
.btn-solid{padding:10px 18px;font-size:.92rem;border-radius:12px}
.btn-primary:hover:not(:disabled),.btn-solid:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 8px 28px rgba(198,255,61,.3)}
.btn-primary:disabled,.btn-solid:disabled{opacity:.35;cursor:not-allowed}
.btn-ghost{background:none;border:1px solid var(--line);color:var(--muted);padding:8px 14px;border-radius:10px;cursor:pointer;font-size:.85rem;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:6px;transition:.15s}
.btn-ghost:hover{color:var(--accent);border-color:var(--accent)}
.btn-ghost.danger:hover{color:var(--danger);border-color:var(--danger)}
.btn-danger{background:var(--danger);color:#fff;font-weight:700;border:none;border-radius:12px;padding:10px 18px;cursor:pointer}
.btn-danger:disabled{opacity:.35;cursor:not-allowed}
.btn-google{display:flex;align-items:center;justify-content:center;gap:12px;width:100%;background:#fff;color:#1f1f1f;font-weight:600;border:none;border-radius:14px;padding:14px 20px;cursor:pointer;font-size:1rem;transition:.15s}
.btn-google:hover{transform:translateY(-1px);box-shadow:0 8px 28px rgba(255,255,255,.14)}
.btn-google svg{width:22px;height:22px}
.link{color:var(--accent);text-decoration:underline;cursor:pointer;background:none;border:none}

/* forms */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.field{display:flex;flex-direction:column;gap:6px;min-width:0}
.field.full{grid-column:1/-1}
.field label{font-size:.82rem;color:var(--muted)}
input[type=text],input[type=email],input[type=tel],input[type=password],input[type=number],select,textarea{width:100%;background:var(--panel-2);color:var(--text);border:1px solid var(--line);border-radius:12px;padding:12px 14px;font:inherit;font-size:1rem;transition:.15s;min-width:0}
textarea{resize:vertical;min-height:88px}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(198,255,61,.12)}
input:invalid:not(:placeholder-shown):not(:focus){border-color:var(--danger)}
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chips input{display:none}
.chips label{padding:9px 16px;border:1px solid var(--line);border-radius:999px;cursor:pointer;color:var(--text);font-size:.92rem;background:var(--panel-2);transition:.15s;user-select:none}
.chips input:checked + label{background:var(--accent);color:var(--accent-ink);border-color:var(--accent);font-weight:700}

/* switch */
.switch{display:flex;align-items:center;gap:12px;cursor:pointer;user-select:none}
.switch input{display:none}
.slider{width:46px;height:26px;border-radius:999px;background:#33333d;position:relative;transition:.2s;flex-shrink:0}
.slider::after{content:"";position:absolute;top:3px;left:3px;width:20px;height:20px;border-radius:50%;background:#fff;transition:.2s}
.switch input:checked + .slider{background:var(--accent)}
.switch input:checked + .slider::after{transform:translateX(20px);background:var(--accent-ink)}
.switch input:disabled + .slider{opacity:.5}
.toggle-row{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:14px 0;border-bottom:1px solid var(--line)}
.toggle-row:last-child{border:none;padding-bottom:0}
.toggle-row:first-of-type{padding-top:0}
.toggle-row h4{font-size:1rem}
.toggle-row p{color:var(--muted);font-size:.84rem}

/* banners / pills */
.banner{display:block;border-radius:12px;padding:11px 14px;font-size:.9rem;margin-bottom:16px;border:1px solid var(--line);background:var(--panel-2)}
.banner .dot{margin-right:8px}
.banner.ok{border-color:rgba(61,220,132,.4);background:rgba(61,220,132,.07);color:#b6f5d1}
.banner.warn{border-color:rgba(255,176,32,.45);background:rgba(255,176,32,.08);color:#ffd98f}
.banner.err{border-color:rgba(255,92,92,.45);background:rgba(255,92,92,.08);color:#ffb3b3}
.pill{display:inline-flex;align-items:center;gap:6px;font-size:.76rem;font-weight:700;padding:4px 11px;border-radius:999px;white-space:nowrap}
.pill.ok{background:rgba(61,220,132,.14);color:var(--ok)}
.pill.warn{background:rgba(255,176,32,.14);color:var(--warn)}
.pill.off{background:#26262e;color:var(--muted)}
.dot{width:8px;height:8px;border-radius:50%;background:var(--ok);display:inline-block;vertical-align:middle;animation:pulse 1.6s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(61,220,132,.6)}100%{box-shadow:0 0 0 9px rgba(61,220,132,0)}}

/* tabs */
.tabs{display:flex;gap:6px;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:5px;margin-bottom:20px;overflow-x:auto;scrollbar-width:none}
.tabs::-webkit-scrollbar{display:none}
.tabs button,.tabs a{flex:1;white-space:nowrap;text-align:center;text-decoration:none;background:none;border:none;color:var(--muted);padding:10px 16px;border-radius:10px;cursor:pointer;font-weight:600;font-size:.92rem;display:inline-flex;align-items:center;justify-content:center;gap:8px;transition:.15s}
.tabs .active{background:var(--accent);color:var(--accent-ink)}
.tabs .active .dot{background:var(--accent-ink);animation:none}

/* student: question cards + thumbs */
.profile-sum{display:flex;align-items:center;gap:12px;justify-content:space-between;flex-wrap:wrap}
.profile-sum b{display:block}
.profile-sum small{color:var(--muted)}
.qcard{background:var(--panel-2);border:1px solid var(--line);border-radius:16px;padding:14px;margin-top:14px}
.qhead{display:flex;align-items:center;gap:12px}
.qno{width:34px;height:34px;border-radius:10px;background:rgba(198,255,61,.12);color:var(--accent);display:grid;place-items:center;font-weight:800;flex-shrink:0}
.qhead .t{flex:1;min-width:0}
.qhead h3{font-size:1rem;overflow-wrap:anywhere}
.qhead p{color:var(--muted);font-size:.8rem}
.add-btn{cursor:pointer;border:1px dashed rgba(198,255,61,.5);color:var(--accent);border-radius:10px;padding:8px 12px;font-size:.85rem;font-weight:600;white-space:nowrap;transition:.15s}
.add-btn:hover{background:rgba(198,255,61,.08)}
.thumbs{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:10px;margin-top:12px}
.thumbs:empty{display:none}
.thumb{position:relative;background:var(--bg);border:1px solid var(--line);border-radius:12px;overflow:hidden;animation:rise .25s ease both}
.thumb-img{display:block;width:100%;aspect-ratio:1;background:none;border:none;cursor:zoom-in;overflow:hidden}
.thumb-img img{width:100%;height:100%;object-fit:contain;transition:transform .25s}
.thumb-n{position:absolute;top:6px;left:6px;background:rgba(0,0,0,.7);font-size:.72rem;font-weight:700;border-radius:7px;padding:1px 7px}
.thumb-act{display:flex;border-top:1px solid var(--line)}
.thumb-act button{flex:1;background:none;border:none;color:var(--muted);padding:8px 0;cursor:pointer;font-size:1rem}
.thumb-act button:hover{color:var(--accent);background:rgba(198,255,61,.06)}
.thumb-act button.del:hover{color:var(--danger);background:rgba(255,92,92,.08)}
.sticky-submit{position:sticky;bottom:0;margin:18px -4px 0;padding:12px 4px calc(12px + env(safe-area-inset-bottom));background:linear-gradient(transparent,var(--panel) 28%)}
.sticky-submit .btn-primary{margin:0}
.progress{margin-top:16px}
.bar{height:10px;border-radius:999px;background:#26262e;overflow:hidden}
.fill{height:100%;width:0;background:linear-gradient(90deg,var(--accent),#e9ff9a);transition:width .25s}
.progress p{color:var(--muted);font-size:.88rem;margin-top:8px}
.success{text-align:center;padding:12px 0}
.success .big{width:68px;height:68px;border-radius:50%;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;font-size:2rem;font-weight:800;margin:0 auto 14px}
.success h2{font-size:1.5rem}
.success p{color:var(--muted);margin-top:6px}
.counts{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:16px}
.counts span{background:var(--panel-2);border:1px solid var(--line);border-radius:999px;padding:5px 12px;font-size:.82rem;color:var(--muted)}
.counts b{color:var(--accent)}

/* leaderboard */
.lb-head,.lb-row{display:grid;grid-template-columns:78px 1fr 84px;gap:10px;align-items:center}
.lb-head{padding:0 14px 8px;color:var(--muted);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase}
.lb-head span:last-child,.lb-marks{text-align:right}
.lb{list-style:none;display:flex;flex-direction:column;gap:8px}
.lb-row{background:var(--panel-2);border:1px solid var(--line);border-radius:14px;padding:12px 14px;transition:.2s;animation:rise .3s ease both}
.lb-rank{font-weight:800;font-size:1.1rem;color:var(--accent)}
.lb-row.pending .lb-rank,.lb-row.pending .lb-marks{color:var(--warn);font-size:.8rem;font-weight:700}
.lb-name{font-weight:600;overflow-wrap:anywhere}
.lb-name em{font-style:normal;font-size:.68rem;background:var(--accent);color:var(--accent-ink);border-radius:6px;padding:1px 6px;margin-left:4px;vertical-align:middle}
.lb-college{color:var(--muted);font-size:.82rem;overflow-wrap:anywhere}
.lb-marks{font-weight:800;font-size:1.15rem}
.lb-row.top1{border-color:#ffd34d;background:linear-gradient(90deg,rgba(255,211,77,.12),var(--panel-2))}
.lb-row.top2{border-color:#c9d1d9;background:linear-gradient(90deg,rgba(201,209,217,.1),var(--panel-2))}
.lb-row.top3{border-color:#d58a4b;background:linear-gradient(90deg,rgba(213,138,75,.1),var(--panel-2))}
.lb-row.me{box-shadow:0 0 0 2px rgba(198,255,61,.55)}
.empty{text-align:center;color:var(--muted);padding:30px 10px}
.lb-title{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:14px;flex-wrap:wrap}
.lb-title h2{margin:0;display:flex;align-items:center;gap:10px}

/* admin */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:16px}
.stat{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:16px;min-width:0}
.stat small{color:var(--muted);font-size:.78rem;text-transform:uppercase;letter-spacing:.08em}
.stat b{display:block;font-size:2rem;line-height:1.15;margin-top:4px}
.stat.warn{border-color:rgba(255,176,32,.5);background:rgba(255,176,32,.06)}
.stat.warn b{color:var(--warn)}
.stat.ok b{color:var(--ok)}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start;margin-bottom:16px}
.grid-2 > .card + .card{margin-top:0}
.qrow{display:grid;grid-template-columns:1fr 84px 38px;gap:8px;margin-bottom:8px;align-items:center}
.qrow input{padding:10px 12px}
.row-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
.action-big{display:flex;flex-wrap:wrap;gap:12px}
.action-big button{flex:1 1 200px}
.toolbar{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:14px}
.toolbar input{flex:1 1 200px}
.seg{display:flex;gap:6px}
.seg button{background:var(--panel-2);border:1px solid var(--line);color:var(--muted);border-radius:10px;padding:9px 14px;cursor:pointer;font-size:.85rem;font-weight:600}
.seg button.active{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
.list{display:flex;flex-direction:column;gap:8px}
.row-item{display:flex;align-items:center;gap:12px;background:var(--panel-2);border:1px solid var(--line);border-left:4px solid var(--warn);border-radius:14px;padding:12px 14px;text-decoration:none;color:inherit;transition:.15s;min-width:0}
.row-item:hover{transform:translateX(2px);border-color:var(--accent)}
.row-item.evaluated{border-left-color:var(--ok);background:linear-gradient(90deg,rgba(61,220,132,.09),var(--panel-2))}
.row-item.pending{background:linear-gradient(90deg,rgba(255,176,32,.07),var(--panel-2))}
.row-item .meta{flex:1;min-width:0}
.row-item .name{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.row-item .sub{color:var(--muted);font-size:.8rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.detail-head{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:16px}
.detail-head h1{font-size:1.4rem;flex:1;min-width:140px;overflow-wrap:anywhere}
.info-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px}
.info-grid small{display:block;color:var(--muted);font-size:.74rem;text-transform:uppercase;letter-spacing:.08em}
.info-grid div{min-width:0;overflow-wrap:anywhere}
.info-grid a{color:var(--accent)}
.qeval{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:16px;margin-top:14px}
.qeval-head{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.qeval-head h3{flex:1;min-width:120px;font-size:1.05rem}
.mark-box{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:.9rem}
.mark-box input{width:86px;text-align:center;font-weight:700;font-size:1.1rem;padding:9px}
.mark-box input.bad{border-color:var(--danger)}
.shots{display:grid;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:10px;margin-top:12px}
.shot{background:var(--bg);border:1px solid var(--line);border-radius:12px;overflow:hidden;cursor:zoom-in;position:relative;aspect-ratio:3/4;padding:0}
.shot img{width:100%;height:100%;object-fit:cover}
.shot span{position:absolute;left:6px;top:6px;background:rgba(0,0,0,.7);font-size:.72rem;font-weight:700;border-radius:7px;padding:1px 7px}
.skel{height:130px;border-radius:12px;background:linear-gradient(90deg,var(--panel-2),#24242c,var(--panel-2));background-size:200% 100%;animation:sh 1.2s infinite}
@keyframes sh{to{background-position:-200% 0}}
.eval-foot{position:sticky;bottom:0;margin-top:16px;padding:12px 0 calc(12px + env(safe-area-inset-bottom));background:linear-gradient(transparent,var(--bg) 25%);display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.eval-foot .total{flex:1 1 100%;display:flex;justify-content:space-between;align-items:baseline;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:10px 16px}
.eval-foot .total b{font-size:1.5rem;color:var(--accent)}
.eval-foot button{flex:1 1 150px}
.footer{text-align:center;color:var(--muted);font-size:.82rem;padding:22px;border-top:1px solid var(--line)}
.loader{display:grid;place-items:center;padding:70px 0}
.spin{width:34px;height:34px;border-radius:50%;border:3px solid var(--line);border-top-color:var(--accent);animation:sp .8s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}

/* toast + modal */
.toast{position:fixed;left:50%;bottom:26px;transform:translate(-50%,30px);background:#24242c;border:1px solid var(--line);padding:12px 18px;border-radius:12px;opacity:0;pointer-events:none;transition:.25s;max-width:90vw;font-size:.9rem;z-index:100}
.toast.show{opacity:1;transform:translate(-50%,0)}
.toast.error{border-color:var(--danger);color:#ffb3b3}
.toast.ok{border-color:var(--ok);color:#b6f5d1}
.modal{position:fixed;inset:0;background:rgba(0,0,0,.7);backdrop-filter:blur(4px);display:grid;place-items:center;padding:16px;z-index:60;animation:fade .2s}
@keyframes fade{from{opacity:0}}
.modal-box{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:22px;width:100%;max-width:440px;max-height:90vh;overflow:auto;animation:rise .25s}
.modal-box h3{font-size:1.2rem;margin-bottom:10px}
.modal-body{color:var(--muted);font-size:.93rem}
.modal-body ul{margin:10px 0 10px 18px}
.modal-body b{color:var(--text)}
.modal-body input{margin-top:12px}
.modal-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:18px;flex-wrap:wrap}

/* lightbox */
.lb-modal{position:fixed;inset:0;background:rgba(0,0,0,.97);z-index:80;display:flex;flex-direction:column;animation:fade .2s}
.lbx-top{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:10px 12px;position:relative;z-index:2}
.lbx-cap{font-size:.85rem;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.lbx-tools{display:flex;gap:6px}
.lbx-tools button{width:42px;height:42px;border-radius:12px;background:var(--panel);border:1px solid var(--line);font-size:1.2rem;cursor:pointer}
.lbx-tools button:hover{border-color:var(--accent);color:var(--accent)}
.lbx-stage{flex:1;position:relative;overflow:hidden;touch-action:none;cursor:grab}
.lbx-stage img{position:absolute;left:50%;top:50%;max-width:none;user-select:none;-webkit-user-drag:none;transition:transform .2s;will-change:transform}
.lbx-nav{position:absolute;top:50%;transform:translateY(-50%);width:44px;height:64px;background:rgba(20,20,24,.7);border:1px solid var(--line);color:var(--text);font-size:1.8rem;cursor:pointer;z-index:2;border-radius:12px}
.lbx-nav.prev{left:8px}.lbx-nav.next{right:8px}

/* ---------- Mobile ---------- */
@media (max-width:760px){
  .stats{grid-template-columns:1fr 1fr}
  .grid-2{grid-template-columns:1fr}
}
@media (max-width:640px){
  .topbar{padding:10px 14px}
  .brand-logo{height:42px}
  .badge{font-size:.66rem;padding:4px 9px}
  .userchip span{display:none}
  .container{padding-top:24px;padding-bottom:24px}
  .hero{margin-bottom:20px}
  .hero p{font-size:.92rem}
  .card{padding:16px;border-radius:16px}
  .form-grid{grid-template-columns:1fr}
  .thumbs{grid-template-columns:repeat(3,1fr);gap:8px}
  .qhead{flex-wrap:wrap}
  .hide-sm{display:none}
  .lb-head,.lb-row{grid-template-columns:56px 1fr 62px;gap:8px}
  .lb-row{padding:11px 12px}
  .qrow{grid-template-columns:1fr 70px 38px}
  .toast{width:calc(100vw - 32px);text-align:center}
  .shots{grid-template-columns:repeat(3,1fr)}
  .modal-actions button{flex:1}
  .lbx-nav{width:38px;height:54px}
  .row-item{padding:11px 12px}
  .row-item .pill{font-size:.7rem;padding:3px 8px}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}