@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700;800&family=Hind:wght@400;500;600;700&display=swap');
:root{font-family:'DM Sans','Hind',system-ui,-apple-system,sans-serif;color:#183c3a;background:#f8fbf8;--bg:#f8fbf8;--surface:#fff;--surface2:#eaf8f4;--surface3:#f1f8f6;--ink:#183c3a;--muted:#65817e;--brand:#117c76;--brand-dark:#085b58;--outline:#dceae4;--gold:#f7c97e;--danger:#bb444d;--safe:#13744e;--shadow:0 12px 32px rgba(17,76,70,.07);--radius:20px;--nav-width:256px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-width:320px}body,button,input,textarea,select{font-family:inherit}button,input,textarea,select{font-size:inherit}button,a{touch-action:manipulation}a{text-decoration:none;color:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.48}img{max-width:100%}h1,h2,h3,h4,p{margin-top:0}h1{font-size:clamp(2.45rem,5vw,4.3rem);line-height:1.09;letter-spacing:-.065em}h2{font-size:clamp(1.6rem,2.7vw,2.4rem);line-height:1.18;letter-spacing:-.045em}h3{font-size:1.12rem}p{line-height:1.65}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #ffbe5c;outline-offset:3px}.muted,.hint{color:var(--muted)}.hint{font-size:.86rem}.tiny{font-size:.78rem}.strong{font-weight:800}.eyebrow{font-size:.81rem;text-transform:uppercase;letter-spacing:.15em;font-weight:800;color:var(--brand)}.container{max-width:1210px;margin:0 auto;padding:0 24px}.narrow{max-width:800px}.section{padding:74px 0}.section.compact{padding:40px 0}.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:20px;margin-bottom:26px}.section-head h2{margin:0}.section-head p{margin:10px 0 0}.panel{background:var(--surface);border:1px solid var(--outline);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}.panel.soft{background:var(--surface2);box-shadow:none}.panel.flat{box-shadow:none}.grid{display:grid;gap:20px}.cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.cols-4{grid-template-columns:repeat(4,minmax(0,1fr))}.row{display:flex;align-items:center;gap:12px}.between{justify-content:space-between}.wrap{flex-wrap:wrap}.stack{display:flex;flex-direction:column;gap:14px}.spaced{margin-top:24px}.spaced-lg{margin-top:40px}.pill,.tag{display:inline-flex;align-items:center;gap:6px;padding:6px 11px;border-radius:40px;background:var(--surface2);color:var(--brand-dark);font-weight:700;font-size:.79rem}.tag.neutral{background:var(--surface3);color:var(--muted)}.tag.gold{background:#fff0d8;color:#77521e}.tag.red{background:#ffeded;color:#ab3c4c}.btn{border:none;border-radius:12px;display:inline-flex;align-items:center;justify-content:center;text-align:center;gap:8px;font-size:.92rem;font-weight:750;min-height:44px;padding:10px 19px;transition:transform .15s ease,background .15s ease}.btn:hover:not(:disabled){transform:translateY(-1px)}.btn.primary{background:var(--brand);color:white}.btn.primary:hover{background:var(--brand-dark)}.btn.secondary{background:var(--surface2);color:var(--brand-dark)}.btn.outline{border:1px solid var(--outline);color:var(--ink);background:var(--surface)}.btn.danger{background:#fae4e3;color:#a02e36}.btn.dark{background:#163b39;color:white}.btn.sm{min-height:35px;padding:7px 12px;font-size:.82rem}.btn.wide{width:100%}.link{color:var(--brand);font-weight:800}.link:hover{text-decoration:underline}.field{display:flex;flex-direction:column;gap:7px;font-size:.87rem;font-weight:750}.field input,.field select,.field textarea,.input{width:100%;background:var(--surface);border:1px solid #cbded6;border-radius:12px;padding:12px 14px;color:var(--ink);min-height:46px;outline:none}.field textarea{min-height:110px;resize:vertical}.field input:focus,.field textarea:focus,.field select:focus{border-color:var(--brand);box-shadow:0 0 0 3px #21968d23}.form-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.empty{padding:38px 24px;border:1px dashed #b7d5cc;background:var(--surface3);border-radius:18px;text-align:center}.empty .icon{font-size:2rem}.empty h3{margin:14px 0 6px}.errorbox{background:#fff2f0;border:1px solid #f2c6c1;color:#8a3136;border-radius:14px;padding:15px}.notice{background:var(--surface2);color:var(--ink);border:1px solid var(--outline);padding:14px 18px;border-radius:14px}.warning{background:#fff7e7;border:1px solid #f4dfb1;color:#785c26;padding:14px 18px;border-radius:14px}.skeleton{height:100px;background:linear-gradient(110deg,var(--surface2),var(--surface),var(--surface2));background-size:220% 100%;animation:shine 1.6s linear infinite;border-radius:14px}@keyframes shine{to{background-position-x:-220%}}#toast-area{position:fixed;z-index:250;right:18px;bottom:24px;display:grid;gap:9px;max-width:min(420px,90vw)}.toast{background:#173c39;color:white;padding:13px 18px;border-radius:12px;box-shadow:var(--shadow)}.toast.error{background:#a93e47}.initial-loader{height:100vh;display:flex;align-items:center;justify-content:center;gap:12px;font-size:1.3rem;font-weight:800}
/* Public nav */.topbar{height:78px;background:rgba(250,253,250,.96);border-bottom:1px solid var(--outline);position:sticky;top:0;z-index:80;backdrop-filter:blur(18px)}.topbar-inner{height:100%;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:inline-flex;align-items:center;gap:10px;font-weight:900;letter-spacing:-.04em;font-size:1.25rem;white-space:nowrap}.brand img{width:43px;height:43px;object-fit:contain}.navlinks{display:flex;align-items:center;gap:25px}.navlinks a{font-weight:700;font-size:.92rem}.navlinks a.active{color:var(--brand)}.nav-actions{display:flex;gap:9px}.mobile-nav-toggle{display:none}.mobile-menu{display:none;background:var(--surface);border-top:1px solid var(--outline);padding:16px 24px}.mobile-menu.open{display:grid;gap:12px}.mobile-menu a{padding:10px 4px;font-weight:700}
/* Public home */.hero{position:relative;padding:83px 0 76px;overflow:hidden;background:radial-gradient(ellipse at 70% 35%,#c9f2e1 0%,transparent 40%),linear-gradient(130deg,#f4fbf8,#edf9f5 72%,#fff9ea)}.hero-grid{display:grid;grid-template-columns:minmax(0,1.06fr) minmax(360px,.94fr);align-items:center;gap:48px}.hero h1{margin:17px 0 20px}.hero p{max-width:560px;font-size:1.03rem;color:#587974}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:26px 0}.hero-tags{display:flex;flex-wrap:wrap;gap:9px}.hero-art{position:relative;min-height:420px;border-radius:32px;background:linear-gradient(145deg,#0e746e,#12544f);padding:30px;color:white;overflow:hidden;box-shadow:0 30px 55px rgba(8,95,88,.2)}.hero-art:before{content:'';position:absolute;width:280px;height:280px;border:40px solid #ffffff10;border-radius:100%;right:-100px;top:-100px}.poster-inner{position:relative;z-index:1}.poster-logo{width:84px;height:84px;object-fit:contain;border-radius:22px;background:#fff;padding:7px}.hero-art h2{color:#fff;font-size:2.25rem;max-width:320px;margin:26px 0 12px}.hero-art p{color:#d3efea;font-size:.95rem}.typing-visual{border:1px solid #ffffff3a;border-radius:16px;padding:17px;margin-top:22px;background:#ffffff12;font-family:monospace;font-size:.87rem;line-height:1.8;color:#f9fcf8}.typing-visual b{color:#ffcf88}.visual-key{border:1px solid #ffffff55;border-radius:6px;padding:3px 9px;background:#ffffff24;margin-right:4px;display:inline-block}.smart-search{position:relative;max-width:780px;margin:0 auto}.smart-search .search-input{width:100%;min-height:66px;background:var(--surface);border:1px solid var(--outline);border-radius:17px;box-shadow:var(--shadow);padding:18px 56px 18px 22px;font-size:1rem}.search-suggest{position:absolute;z-index:50;top:calc(100% + 6px);left:0;right:0;background:var(--surface);border:1px solid var(--outline);border-radius:14px;box-shadow:var(--shadow);max-height:320px;overflow:auto}.search-suggest a{display:block;padding:12px 18px;border-bottom:1px solid var(--outline)}.search-suggest a:hover{background:var(--surface2)}.chips{display:flex;flex-wrap:wrap;gap:8px}.chip{border:1px solid var(--outline);background:var(--surface);padding:9px 14px;border-radius:30px;font-weight:700;color:var(--ink)}.chip.active{background:var(--brand);color:white;border-color:var(--brand)}.exam-card{display:flex;flex-direction:column;gap:11px;min-height:252px}.exam-symbol{display:grid;place-items:center;width:54px;height:54px;background:var(--surface2);border-radius:13px;font-size:1.5rem}.exam-card h3{margin:0}.exam-card .actions{margin-top:auto}.free-card{min-height:230px;display:flex;flex-direction:column;justify-content:space-between;gap:16px;background:linear-gradient(130deg,#e8faf3,#fff)}.free-card:nth-child(2){background:linear-gradient(130deg,#fff3df,#fff)}.free-card .glyph{font-size:2.4rem}.step-no{width:39px;height:39px;display:grid;place-items:center;border-radius:12px;background:var(--surface2);font-weight:900;color:var(--brand)}.feature-card{background:var(--surface);border:1px solid var(--outline);padding:22px;border-radius:18px}.feature-card .glyph{font-size:1.75rem;margin-bottom:14px;display:block}.faq-list details{background:var(--surface);border:1px solid var(--outline);border-radius:14px;margin-bottom:10px;padding:0 20px}.faq-list summary{cursor:pointer;font-weight:750;padding:17px 3px}.faq-list details p{color:var(--muted);margin:0 3px 17px}.footer{background:#123e3c;color:#e4f4ee;padding:60px 0 20px}.footer .brand{color:white}.footer p{color:#b4d5ce}.footer a:hover{text-decoration:underline}.footer-cols{display:grid;grid-template-columns:2fr repeat(3,1fr);gap:35px}.footer h4{margin:0 0 20px}.footer-links{display:grid;gap:12px;font-size:.89rem}.footer-bottom{border-top:1px solid #ffffff2b;margin-top:42px;padding-top:20px;color:#b4d5ce;font-size:.83rem}
/* Account layout */.shell{display:grid;grid-template-columns:var(--nav-width) minmax(0,1fr);min-height:100vh}.sidebar{background:var(--surface);border-right:1px solid var(--outline);padding:22px 14px;display:flex;flex-direction:column;position:sticky;height:100vh;top:0}.sidebar .brand{padding:2px 9px 26px}.side-label{font-size:.69rem;letter-spacing:.15em;text-transform:uppercase;color:var(--muted);margin:18px 15px 9px;font-weight:800}.side-link{display:flex;align-items:center;gap:11px;padding:11px 14px;border-radius:12px;font-size:.94rem;font-weight:700;color:var(--muted);margin:2px 0}.side-link .glyph{font-size:1.17rem;width:24px;text-align:center}.side-link.active,.side-link:hover{background:var(--surface2);color:var(--brand-dark)}.sidebar-spacer{flex:1}.shell-main{min-width:0}.shell-top{height:70px;background:var(--surface);border-bottom:1px solid var(--outline);display:flex;align-items:center;justify-content:space-between;padding:0 33px;gap:15px}.shell-top .user{font-weight:800}.app-content{padding:38px 32px 84px;max-width:1240px;margin:auto}.page-heading{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:28px}.page-heading h1{font-size:clamp(1.9rem,3vw,2.6rem);margin:0 0 7px;letter-spacing:-.05em}.bottom-nav{display:none}.metric{min-height:125px}.metric strong{display:block;font-size:1.8rem;letter-spacing:-.04em;margin:12px 0}.metric .label{color:var(--muted);font-size:.86rem}.content-list{display:grid;gap:12px}.content-row{background:var(--surface);border:1px solid var(--outline);border-radius:14px;padding:17px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px}.content-row h3{margin:0 0 5px}.filter-bar{display:flex;align-items:center;flex-wrap:wrap;gap:10px;margin-bottom:20px}.filter-bar>*{max-width:100%}.filters-aside{display:grid;grid-template-columns:260px 1fr;align-items:start;gap:22px}.filter-panel{position:sticky;top:18px}.filter-panel .field{margin:0 0 14px}.state-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.tiny-table{width:100%;border-collapse:collapse}.tiny-table th,.tiny-table td{text-align:left;border-bottom:1px solid var(--outline);padding:13px 8px;font-size:.88rem}.tiny-table th{color:var(--muted)}.overflow{overflow-x:auto}.tabbar{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:18px 0}.tabbar button{padding:9px 16px;background:var(--surface);border:1px solid var(--outline);border-radius:10px;color:var(--ink);font-weight:750}.tabbar button.active{background:var(--brand);color:white;border-color:var(--brand)}.subtle-line{border-top:1px solid var(--outline);margin:20px 0}.badge-count{min-width:20px;height:20px;display:inline-grid;place-items:center;border-radius:12px;color:white;background:var(--danger);font-size:.7rem}.auth-card{max-width:500px;margin:48px auto}.auth-card h1{font-size:2.2rem}.auth-card .stack{gap:18px}.center{text-align:center}.modal-overlay{position:fixed;inset:0;background:#092b2bc0;display:flex;align-items:center;justify-content:center;padding:20px;z-index:160;overflow:auto}.modal{background:var(--surface);color:var(--ink);padding:26px;border-radius:20px;width:min(600px,100%);max-height:90vh;overflow:auto;box-shadow:var(--shadow)}.modal.wide{width:min(850px,100%)}.modal h2{font-size:1.55rem}.form-message{font-size:.87rem;min-height:18px}.status-banner{display:flex;align-items:center;gap:12px;background:var(--surface2);border:1px solid var(--outline);border-radius:16px;padding:15px 18px}
/* Test */.test-app{min-height:100vh;display:flex;flex-direction:column;background:var(--bg)}.test-top{position:sticky;top:0;z-index:60;background:var(--surface);border-bottom:1px solid var(--outline);padding:12px 20px;display:flex;align-items:center;justify-content:space-between;gap:15px;min-height:68px}.test-name{font-weight:800}.timer{border-radius:50px;background:var(--surface2);color:var(--brand-dark);padding:9px 16px;font-variant-numeric:tabular-nums;font-weight:900;white-space:nowrap}.timer.warn{background:#fff2d6;color:#98601c}.test-workspace{display:grid;grid-template-columns:minmax(0,1fr) 250px;min-height:calc(100vh - 68px);max-width:1700px;margin:0 auto;width:100%}.test-workspace.stats-off{grid-template-columns:minmax(0,1fr) 36px}.test-body{display:grid;grid-template-columns:1fr 1fr;min-width:0;min-height:0;padding:14px;gap:14px}.test-body.vertical{grid-template-columns:1fr;grid-template-rows:minmax(160px,1fr) minmax(190px,1fr)}.test-pane{min-width:0;display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--outline);border-radius:16px;overflow:hidden;min-height:270px}.test-pane header{padding:13px 18px;border-bottom:1px solid var(--outline);display:flex;align-items:center;justify-content:space-between;font-size:.83rem;font-weight:800}.test-text{padding:21px;white-space:pre-wrap;overflow:auto;flex:1;font-size:1.2rem;line-height:2.05;user-select:none;-webkit-user-select:none}.test-text .current{background:#f7e397;border-radius:3px}.test-text .correct{color:#118057}.test-text .wrong{background:#ffebea;color:#c93e44}.typing-box{border:0;width:100%;height:100%;resize:none;outline:0;padding:20px;background:transparent;color:var(--ink);font-size:1.2rem;line-height:2.05;min-height:200px;flex:1;caret-color:var(--brand)}.test-stats{padding:18px 16px;background:var(--surface);border-left:1px solid var(--outline);display:flex;flex-direction:column;gap:12px}.test-stats .stat{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--outline);padding:10px 2px}.test-stats strong{font-size:1.12rem}.test-stats .bottom{margin-top:auto}.test-stats.collapsed{padding:8px 2px;align-items:center}.test-mobile-stats{display:none}.test-bottom-submit{display:none}.paused-layer{position:fixed;inset:67px 0 0;background:#f8fbf9d9;z-index:70;display:grid;place-items:center;backdrop-filter:blur(2px)}.compare-word{display:inline-block;margin:4px;padding:6px 8px;border-radius:6px;background:var(--surface2);font-size:.9rem}.compare-word.wrong{background:#ffedeb;color:#aa3946}.compare-word.corrected{background:#fff2d4;color:#966d18}.compare-word.correct{background:#e0f6e9;color:#0e704c}
/* discussion */.discussion{display:grid;grid-template-rows:auto minmax(300px,1fr) auto;height:min(75vh,780px);overflow:hidden}.chat-feed{overflow:auto;padding:18px;display:flex;flex-direction:column;gap:12px}.chat-bubble{max-width:80%;align-self:flex-start;background:var(--surface2);padding:13px;border-radius:15px}.chat-bubble.me{align-self:flex-end;background:#d2efe6}.chat-compose{border-top:1px solid var(--outline);padding:14px;display:flex;gap:9px}.chat-compose input{flex:1}.progress-bar{height:9px;border-radius:20px;background:var(--outline);overflow:hidden}.progress-bar>span{height:100%;display:block;background:var(--brand)}
/* dark */html[data-theme="dark"]{--bg:#182c30;--surface:#223b3f;--surface2:#2c4b4d;--surface3:#21393b;--ink:#edf5ed;--muted:#b0c8c2;--brand:#82d6c3;--brand-dark:#9fe7d2;--outline:#38565a;--shadow:0 12px 32px #091a1d46;color-scheme:dark}html[data-theme="dark"] body{background:var(--bg);color:var(--ink)}html[data-theme="dark"] .topbar{background:#1b3437ee}html[data-theme="dark"] .hero{background:linear-gradient(130deg,#192c30,#234945 80%,#46402f)}html[data-theme="dark"] .hero p{color:#bfd7cf}html[data-theme="dark"] .btn.primary,html[data-theme="dark"] .chip.active,html[data-theme="dark"] .tabbar button.active{background:#1d9488;color:white}html[data-theme="dark"] .btn.secondary{color:#cdfaee}html[data-theme="dark"] .free-card{background:linear-gradient(140deg,#264c49,#25383b)}html[data-theme="dark"] .footer{background:#112729}html[data-theme="dark"] .paused-layer{background:#13272cdd}html[data-theme="dark"] .warning{color:#734d14}html[data-theme="dark"] .chat-bubble.me{background:#235b57}
@media(max-width:1080px){.container{padding:0 20px}.hero-grid{gap:20px}.filters-aside{grid-template-columns:220px 1fr}.shell{--nav-width:220px}.app-content{padding:28px 22px 88px}.cols-4{grid-template-columns:repeat(2,1fr)}.test-workspace{grid-template-columns:minmax(0,1fr) 210px}}
@media(max-width:800px){.navlinks,.nav-actions{display:none}.mobile-nav-toggle{display:inline-flex}.hero{padding:48px 0}.hero-grid{grid-template-columns:1fr}.hero-art{min-height:330px;max-width:620px;width:100%;margin:auto}.cols-3{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-cols{grid-template-columns:repeat(2,1fr)}.shell{display:block}.sidebar{display:none}.shell-top{padding:0 20px}.app-content{padding:26px 18px 92px}.bottom-nav{display:flex;position:fixed;bottom:0;left:0;right:0;background:var(--surface);border-top:1px solid var(--outline);padding:9px 4px max(9px,env(safe-area-inset-bottom));z-index:85;justify-content:space-around}.bottom-nav a{font-size:.7rem;display:flex;flex-direction:column;align-items:center;gap:3px;min-width:54px;font-weight:750;color:var(--muted)}.bottom-nav a .glyph{font-size:1.25rem}.bottom-nav a.active{color:var(--brand)}.filters-aside{grid-template-columns:1fr}.filter-panel{position:static}.test-workspace,.test-workspace.stats-off{display:block}.test-body,.test-body.vertical{display:flex;flex-direction:column;padding:10px;gap:10px}.test-pane{min-height:170px}.test-pane.source{max-height:35vh}.test-pane.input-pane{min-height:34vh}.test-stats{display:none}.test-mobile-stats{display:flex;gap:13px;align-items:center;padding:9px 14px;background:var(--surface);border-bottom:1px solid var(--outline);font-size:.81rem}.test-bottom-submit{display:block;position:fixed;right:12px;bottom:12px;z-index:45;box-shadow:var(--shadow)}.test-name{display:none}.test-top{padding:10px}.test-top .top-tools .optional{display:none}.test-text,.typing-box{font-size:1.07rem}.typing-box{min-height:260px}}
@media(max-width:560px){.container{padding:0 16px}.section{padding:48px 0}.section-head{align-items:flex-start}.hero h1{font-size:2.55rem}.hero-art{padding:22px;min-height:350px}.hero-art h2{font-size:1.9rem}.panel{padding:18px}.cols-2,.cols-3,.cols-4{grid-template-columns:1fr}.form-row{grid-template-columns:1fr}.section-head h2{font-size:1.65rem}.page-heading{align-items:flex-start;flex-direction:column}.page-heading h1{font-size:2rem}.content-row{align-items:flex-start;flex-direction:column}.footer-cols{grid-template-columns:1fr 1fr;gap:26px}.footer-cols>div:first-child{grid-column:span 2}.state-grid{grid-template-columns:1fr 1fr}.section-head .btn{white-space:nowrap}.test-top .btn{padding:8px 10px}.test-top{gap:7px}.modal{padding:20px}.nav-actions{display:none}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.001ms!important;transition-duration:.001ms!important;scroll-behavior:auto!important}}