:root{--bg:#080d22;--panel:#111936cc;--line:#ffffff18;--text:#f7f8ff;--muted:#a9b1cf;--purple:#8257ff;--cyan:#20d9ff;--yellow:#ffd84d;--green:#35e79a;--red:#ff6680}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:radial-gradient(circle at 80% 10%,#23235d 0,transparent 32%),radial-gradient(circle at 5% 55%,#0b4c6133,transparent 25%),var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif;min-height:100vh}.bg-grid{position:fixed;inset:0;pointer-events:none;opacity:.22;background-image:linear-gradient(#ffffff08 1px,transparent 1px),linear-gradient(90deg,#ffffff08 1px,transparent 1px);background-size:42px 42px;mask-image:linear-gradient(to bottom,#000,transparent)}a{color:inherit;text-decoration:none}.topbar{height:74px;display:flex;align-items:center;justify-content:space-between;padding:0 clamp(20px,5vw,72px);border-bottom:1px solid var(--line);background:#080d22c9;backdrop-filter:blur(16px);position:sticky;top:0;z-index:20}.brand{font-size:20px;letter-spacing:.6px}.brand span{font-size:25px}.brand em{color:var(--cyan);font-style:normal}.topbar nav{display:flex;gap:28px;color:var(--muted);font-size:14px}.topbar nav a:hover{color:white}main{width:min(1180px,calc(100% - 36px));margin:auto;position:relative;z-index:1}.hero{min-height:calc(100vh - 74px);display:grid;grid-template-columns:1.15fr .85fr;gap:70px;align-items:center;padding:55px 0}.eyebrow{display:inline-block;color:var(--cyan);font-size:12px;font-weight:800;letter-spacing:2px;margin-bottom:12px}.hero h1{font-size:clamp(46px,6vw,78px);line-height:1.02;margin:0 0 22px;letter-spacing:-3px}.hero h1 span{background:linear-gradient(90deg,var(--cyan),#a785ff);-webkit-background-clip:text;color:transparent}.hero>div>p{font-size:18px;line-height:1.7;color:var(--muted);max-width:650px}.hero-badges{display:flex;gap:10px;flex-wrap:wrap;margin-top:25px}.hero-badges span{font-size:12px;border:1px solid var(--line);background:#ffffff08;padding:9px 12px;border-radius:99px}.glass{background:linear-gradient(135deg,#19244ed9,#10162fd9);border:1px solid var(--line);box-shadow:0 25px 80px #0008;backdrop-filter:blur(18px)}.register-card{padding:30px;border-radius:26px}.step{color:var(--green);font-size:11px;font-weight:800;letter-spacing:1.5px}.register-card h2{margin:8px 0 24px;font-size:28px}.register-card p,label{color:var(--muted);font-size:13px}.avatars{display:grid;grid-template-columns:repeat(6,1fr);gap:8px;margin:9px 0 22px}.avatars button{aspect-ratio:1;border-radius:13px;border:1px solid var(--line);background:#ffffff08;font-size:25px;cursor:pointer}.avatars button.selected{border:2px solid var(--cyan);background:#20d9ff20;transform:translateY(-3px)}label{display:block;margin:14px 0 5px}input,select{display:block;width:100%;margin-top:7px;border:1px solid var(--line);background:#080e28;color:white;padding:13px 14px;border-radius:11px;outline:none}input:focus,select:focus{border-color:var(--cyan)}.primary,.button{border:0;color:white;background:linear-gradient(90deg,var(--purple),#5b8cff);font-weight:800;padding:14px 18px;border-radius:12px;cursor:pointer}.full{width:100%;margin-top:18px}.resume{text-align:center;margin-top:15px;color:var(--muted);font-size:12px}.resume button{color:var(--cyan);border:0;background:none;cursor:pointer}.hidden{display:none!important}.dashboard-head{display:flex;justify-content:space-between;align-items:center;margin:46px 0 24px}.dashboard-head h1,.dashboard-head h2{font-size:36px;margin:0}.stats{display:flex;gap:10px}.stats>div,.admin-stats>div{background:#111a38;border:1px solid var(--line);border-radius:14px;padding:12px 22px;min-width:105px}.stats small,.stats strong{display:block}.stats small{font-size:10px;color:var(--muted);letter-spacing:1px}.stats strong{font-size:22px;margin-top:3px;color:var(--yellow)}.progress-panel{padding:20px 24px;border-radius:16px;margin-bottom:26px}.progress-panel>div:first-child{display:flex;justify-content:space-between;margin-bottom:10px}.progress{height:8px;border-radius:99px;background:#ffffff12;overflow:hidden}.progress i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--purple),var(--cyan));border-radius:99px;transition:.5s}.level-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.level-card{position:relative;text-align:left;color:white;background:#111936;border:1px solid var(--line);padding:22px;border-radius:19px;min-height:215px;cursor:pointer;transition:.2s}.level-card:hover:not(.locked){transform:translateY(-5px);border-color:#8257ff99;box-shadow:0 20px 45px #0006}.level-card.locked{filter:grayscale(.8);opacity:.48;cursor:not-allowed}.level-card.locked:after{content:'🔒';position:absolute;right:18px;top:18px}.level-icon{font-size:32px}.level-no{display:block;color:var(--cyan);font-size:10px;font-weight:800;letter-spacing:1px;margin-top:14px}.level-card h3{margin:5px 0 8px;font-size:20px}.level-card p{color:var(--muted);font-size:12px;line-height:1.5;min-height:36px}.level-card small{color:var(--muted)}.stars{color:var(--yellow);font-size:19px;margin:10px 0}.export-box{margin:28px 0 70px;border-radius:20px;padding:22px 28px;display:flex;align-items:center;justify-content:space-between}.export-box h3,.export-box p{margin:3px}.export-box p{color:var(--muted);font-size:13px}.export-box button,.table-tools button{border:1px solid var(--line);background:#ffffff0c;color:white;padding:10px 13px;border-radius:9px;cursor:pointer}dialog{width:min(700px,calc(100% - 28px));border:1px solid var(--line);background:#101730;color:white;border-radius:24px;padding:28px;box-shadow:0 30px 100px #000c}dialog::backdrop{background:#030614d9;backdrop-filter:blur(7px)}.dialog-close{position:absolute;right:18px;top:15px;border:0;background:none;color:var(--muted);font-size:27px;cursor:pointer}.challenge-top{display:flex;justify-content:space-between;color:var(--cyan);font-size:12px;font-weight:800;margin:2px 30px 12px 0}.q-count{color:var(--muted);font-size:12px;margin-top:26px}.q-prompt{font-size:25px;line-height:1.35}.options{display:grid;gap:10px}.option{padding:14px;border:1px solid var(--line);background:#ffffff08;color:white;border-radius:12px;text-align:left;cursor:pointer}.option:hover{border-color:var(--cyan);background:#20d9ff12}.formula-input{font-family:ui-monospace,monospace;font-size:17px}.feedback{padding:17px;border-radius:14px;margin-top:16px}.feedback.correct{background:#35e79a18;border:1px solid #35e79a55}.feedback.wrong{background:#ff668018;border:1px solid #ff668055}.feedback b{display:block;margin-bottom:6px}.result-card{background:radial-gradient(circle at top,#412a82,#111a3b 60%);padding:30px;text-align:center;border-radius:20px;border:1px solid #ffffff22}.result-logo{color:var(--cyan);font-weight:900;letter-spacing:1px}.result-avatar{font-size:72px;margin:20px}.result-card h2{margin:0;font-size:30px}.result-card p{color:var(--muted)}.result-rank{display:inline-block;background:var(--yellow);color:#392e00;font-weight:900;padding:7px 15px;border-radius:99px}.result-stats{display:flex;justify-content:center;gap:35px;margin:25px}.result-stats b,.result-stats small{display:block}.result-stats b{font-size:26px;color:var(--cyan)}.admin-main{padding:45px 0}.login-card{max-width:430px;margin:7vh auto;padding:34px;border-radius:22px}.login-card h1{margin:5px 0}.error{color:var(--red)}.ghost{background:#ffffff0c;border:1px solid var(--line)}.admin-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:15px;margin-bottom:22px}.admin-stats small,.admin-stats b{display:block}.admin-stats small{color:var(--muted)}.admin-stats b{font-size:30px;color:var(--cyan)}.table-panel{border-radius:20px;padding:20px}.table-tools{display:flex;gap:12px;margin-bottom:17px}.table-tools input{margin:0}.table-scroll{overflow:auto}table{width:100%;border-collapse:collapse;font-size:13px}th{text-align:left;color:var(--muted);font-size:10px;letter-spacing:1px}th,td{padding:13px;border-bottom:1px solid var(--line);white-space:nowrap}.student-cell{display:flex;align-items:center;gap:9px}.student-cell i{font-size:23px;font-style:normal}.monitor{background:radial-gradient(circle at top,#211451,#070b20 55%)}.live{font-size:12px;color:var(--muted)}.live i{display:inline-block;width:8px;height:8px;background:var(--red);border-radius:50%;box-shadow:0 0 15px var(--red);animation:pulse 1s infinite}@keyframes pulse{50%{opacity:.3}}.monitor-title{text-align:center;margin:40px 0 20px}.monitor-title h1{font-size:42px;margin:0}.monitor-title p{color:var(--muted)}.monitor-title select{width:180px;margin:15px auto}.podium{display:flex;align-items:end;justify-content:center;gap:18px;min-height:230px;margin:20px 0}.podium-card{width:210px;text-align:center;background:#111936;border:1px solid var(--line);border-radius:20px 20px 8px 8px;padding:20px}.podium-card.first{min-height:225px;border-color:#ffd84d88;order:2}.podium-card.second{min-height:185px;order:1}.podium-card.third{min-height:160px;order:3}.podium-card .avatar{font-size:42px}.podium-card h3{margin:7px 0 2px}.podium-card p{margin:0;color:var(--muted);font-size:12px}.podium-card b{display:block;color:var(--yellow);font-size:21px;margin-top:8px}.leaderboard{border-radius:20px;margin-bottom:50px;overflow:hidden}.leader-head,.leader-row{display:grid;grid-template-columns:100px 1fr 120px 120px 120px;align-items:center;padding:13px 20px}.leader-head{color:var(--muted);font-size:10px;letter-spacing:1px;background:#ffffff08}.leader-row{border-top:1px solid var(--line)}.leader-row .rank{font-size:20px;font-weight:900}.leader-player{display:flex;gap:12px;align-items:center}.leader-player i{font-size:27px;font-style:normal}.leader-player small{display:block;color:var(--muted)}
@media(max-width:850px){.hero{grid-template-columns:1fr;padding-top:38px}.hero h1{font-size:50px}.level-grid{grid-template-columns:repeat(2,1fr)}.dashboard-head{align-items:flex-start;gap:22px;flex-direction:column}.admin-stats{grid-template-columns:repeat(2,1fr)}.topbar nav{gap:12px}.leader-head,.leader-row{grid-template-columns:60px 1fr 70px 80px}.leader-head span:nth-child(3),.leader-row>span:nth-child(3){display:none}.podium-card{width:30%;padding:12px}.podium-card h3{font-size:14px}}@media(max-width:520px){main{width:min(100% - 24px,1180px)}.topbar{padding:0 15px}.topbar nav a:first-child{display:none}.hero{gap:25px}.hero h1{font-size:42px}.avatars{grid-template-columns:repeat(6,1fr)}.avatars button{font-size:20px}.stats{width:100%;overflow:auto}.stats>div{min-width:95px;padding:10px}.level-grid{grid-template-columns:1fr 1fr;gap:10px}.level-card{padding:15px;min-height:220px}.export-box{align-items:flex-start;gap:20px;flex-direction:column}.podium{gap:6px}.podium-card{width:33%;padding:8px}.podium-card .avatar{font-size:30px}.leader-head,.leader-row{grid-template-columns:45px 1fr 60px}.leader-head span:nth-child(4),.leader-row>span:nth-child(4){display:none}}