:root{--navy:#1c2e4a;--deep:#0f1a2b;--blue:#52677d;--ice:#bdc4d4;--paper:#d1cfc9;--accent:#a9d8ff;--white:#fff;--line:rgba(28,46,74,.16);--display:"Avenir Next","Helvetica Neue",Arial,sans-serif;--mono:ui-monospace,SFMono-Regular,Menlo,monospace}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--deep);background:var(--ice);font:400 16px/1.55 var(--display);-webkit-font-smoothing:antialiased}button,input{font:inherit}button,a{-webkit-tap-highlight-color:transparent;touch-action:manipulation}a{color:inherit}.class-shell{width:min(1120px,calc(100% - 40px));min-height:calc(100vh - 56px);margin:28px auto;background:#f8fafc;box-shadow:0 18px 45px rgba(28,46,74,.1)}.class-header{min-height:72px;padding:12px 24px;display:flex;align-items:center;justify-content:space-between;gap:18px;color:#fff;background:var(--navy)}.class-brand{display:inline-flex;align-items:center;gap:11px;text-decoration:none;font-weight:800}.class-brand img{width:40px;height:40px;object-fit:cover;border-radius:50%;background:#fff}.class-nav{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.class-nav a,.class-nav button{min-height:44px;padding:0 14px;display:inline-flex;align-items:center;color:#fff;background:transparent;border:1px solid rgba(255,255,255,.24);border-radius:5px;text-decoration:none;font-size:13px;font-weight:800;cursor:pointer}.class-main{padding:64px max(24px,calc((100% - 960px)/2)) 80px}.kicker{margin:0 0 12px;color:var(--blue);font:800 10px/1.2 var(--mono);letter-spacing:.12em;text-transform:uppercase}.class-hero{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:end;margin-bottom:28px}.class-hero h1{max-width:650px;margin:0;font-size:clamp(42px,6vw,68px);line-height:1;letter-spacing:-.045em}.class-hero>p{margin:0;color:var(--blue)}.mode-banner{margin:0 0 24px;padding:12px 16px;color:var(--navy);background:#eef6fd;border-left:5px solid var(--accent);font-size:13px}.mode-banner strong{display:block}.join-card,.class-card{padding:28px;background:#fff;border:1px solid var(--line);box-shadow:0 10px 28px rgba(28,46,74,.06)}.join-card{max-width:620px;margin-inline:auto}.field{display:grid;gap:8px;margin-top:18px}.field label{font:800 11px/1.3 var(--mono);letter-spacing:.06em;text-transform:uppercase}.field input{min-height:50px;width:100%;padding:12px 14px;color:var(--deep);background:#fbfcfe;border:1px solid var(--line);border-radius:4px;outline:none}.field input:focus{border-color:var(--navy);box-shadow:0 0 0 3px rgba(169,216,255,.55)}.help{margin:7px 0 0;color:var(--blue);font-size:13px}.status{min-height:24px;margin:13px 0 0;color:var(--blue);font-weight:700}.status.error{color:#982f2f}.class-button{min-height:48px;padding:0 18px;display:inline-flex;align-items:center;justify-content:center;gap:10px;color:var(--deep);background:var(--accent);border:0;border-radius:5px;text-decoration:none;font-weight:800;cursor:pointer}.class-button.secondary{background:#fff;border:1px solid var(--line)}.class-button:disabled{opacity:.5;cursor:not-allowed}.class-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:22px 0}.stat{padding:20px;background:var(--navy);color:#fff}.stat span{display:block;color:rgba(255,255,255,.66);font-size:12px}.stat strong{display:block;margin-top:7px;color:var(--accent);font-size:30px}.class-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.class-card h2,.class-card h3{margin:0;color:var(--deep)}.class-card>p{color:var(--blue)}.step-list,.gallery-grid,.teacher-list{display:grid;gap:10px;margin-top:18px}.step-link,.quiz-tile,.teacher-row{padding:16px;display:grid;gap:5px;background:#f8fafc;border:1px solid var(--line);text-decoration:none}.step-link{grid-template-columns:1fr auto;align-items:center}.step-link span,.quiz-tile span,.teacher-row span{color:var(--blue);font-size:13px}.quiz-tile footer{margin-top:10px;display:flex;align-items:center;justify-content:space-between;gap:10px}.pill{width:max-content;padding:5px 8px;color:var(--navy);background:var(--paper);font:800 9px/1 var(--mono);letter-spacing:.06em;text-transform:uppercase}.pill.published{background:var(--accent)}.empty{padding:20px;color:var(--blue);border:1px dashed var(--line)}.teacher-row{grid-template-columns:1fr auto;align-items:center}.teacher-row-actions{display:flex;gap:8px}.small-button{min-height:44px;padding:0 12px;color:var(--navy);background:#fff;border:1px solid var(--line);font-weight:800;cursor:pointer}.quiz-player{max-width:760px;margin:auto}.player-question{margin:28px 0 18px;font-size:27px;font-weight:800}.player-options{display:grid;gap:11px}.player-option{min-height:54px;padding:14px 16px;text-align:left;color:var(--navy);background:#fff;border:1px solid var(--line);cursor:pointer}.player-option[aria-pressed="true"]{border-color:var(--navy);box-shadow:inset 5px 0 var(--accent)}.progress-track{height:7px;margin-top:20px;background:#e3e7ee}.progress-track i{height:100%;display:block;background:var(--accent)}.result-card{padding:24px;color:#fff;background:var(--navy)}.result-card strong{color:var(--accent);font-size:42px}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
.quiz-player{color:var(--quiz-ink,var(--deep))}.quiz-player .player-question{color:var(--quiz-ink,var(--deep))}.quiz-player .player-option{color:var(--quiz-ink,var(--navy));font:inherit}.quiz-player .player-option[aria-pressed="true"]{border-color:var(--quiz-header,var(--navy));box-shadow:inset 5px 0 var(--quiz-accent,var(--accent))}.quiz-player .progress-track i{background:var(--quiz-accent,var(--accent))}.quiz-player .result-card{background:var(--quiz-header,var(--navy))}.quiz-player .result-card strong{color:var(--quiz-accent,var(--accent))}
.analytics-card{margin:0 0 18px}.analytics-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:20px}.analytics-chart{padding:20px;background:#f8fafc;border:1px solid var(--line)}.analytics-chart h3{font-size:18px}.analytics-chart>p{margin:5px 0 16px;color:var(--blue);font-size:13px}.pie-layout{display:grid;grid-template-columns:minmax(130px,170px) 1fr;align-items:center;gap:20px}.pie-chart{width:100%;aspect-ratio:1;display:grid;place-items:center;background:var(--pie);border-radius:50%;box-shadow:inset 0 0 0 1px rgba(28,46,74,.08)}.pie-chart::before{content:"";grid-area:1/1;width:56%;aspect-ratio:1;background:#f8fafc;border-radius:50%}.pie-chart span{grid-area:1/1;z-index:1;display:grid;text-align:center;line-height:1}.pie-chart strong{font-size:28px}.pie-chart small{max-width:78px;margin-top:5px;color:var(--blue);font:800 8px/1.2 var(--mono);letter-spacing:.07em;text-transform:uppercase}.pie-legend{display:grid;gap:8px}.pie-key{display:grid;grid-template-columns:10px minmax(0,1fr) auto;align-items:start;gap:8px;padding-bottom:7px;border-bottom:1px solid var(--line);font-size:12px}.pie-key i{width:10px;height:10px;margin-top:4px;background:var(--key-color);border-radius:2px}.pie-key span{min-width:0;color:var(--blue);overflow-wrap:anywhere}.pie-key strong{text-align:right}.analytics-empty{margin:0;padding:16px;color:var(--blue);background:#fff;border:1px dashed var(--line);font-size:13px}.danger-button{color:#8b2531;border-color:rgba(139,37,49,.3)}.danger-button:hover{color:#fff;background:#8b2531;border-color:#8b2531}
.teacher-toolbar{margin:0 0 22px;padding:18px 20px;display:grid;grid-template-columns:minmax(220px,360px) 1fr;align-items:end;gap:24px;background:#fff;border:1px solid var(--line)}.teacher-toolbar label{display:grid;gap:7px}.teacher-toolbar label span{font:800 10px/1.2 var(--mono);letter-spacing:.1em;text-transform:uppercase}.teacher-toolbar select{min-height:48px;width:100%;padding:0 42px 0 14px;color:var(--deep);background:#f8fafc;border:1px solid var(--line);border-radius:4px;font-weight:800}.teacher-toolbar p{margin:0 0 11px;color:var(--blue);font-size:13px}
@media(max-width:820px){.class-shell{width:100%;min-height:100vh;margin:0}.class-main{padding:48px 24px 72px}.class-hero{grid-template-columns:1fr;gap:18px}.class-grid,.analytics-grid{grid-template-columns:1fr}.stat-grid{grid-template-columns:repeat(2,1fr)}.class-header{padding-left:max(18px,env(safe-area-inset-left));padding-right:max(18px,env(safe-area-inset-right))}.teacher-toolbar{grid-template-columns:1fr;gap:8px}.teacher-toolbar p{margin:0}}
@media(max-width:540px){.class-header{align-items:flex-start;flex-direction:column}.class-nav{width:100%}.class-nav a,.class-nav button{flex:1;justify-content:center}.class-main{padding:40px 18px 64px}.class-hero h1{font-size:42px}.join-card,.class-card{padding:22px 18px}.stat-grid{grid-template-columns:1fr 1fr}.class-actions .class-button{width:100%}.teacher-row{grid-template-columns:1fr}.teacher-row-actions{width:100%}.small-button{flex:1}.field input{font-size:16px}.pie-layout{grid-template-columns:1fr}.pie-chart{width:min(210px,72vw);margin-inline:auto}.pie-key{font-size:13px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
.pie-details summary{cursor:pointer;list-style:none}.pie-details summary::-webkit-details-marker{display:none}.pie-hint{display:block;margin-top:10px;color:var(--blue);font-size:12px;text-decoration:underline}.pie-details[open] .pie-hint{display:none}.pie-people{width:100%;margin-top:14px;border-collapse:collapse;font-size:13px}.pie-people th,.pie-people td{padding:6px 4px;border-bottom:1px solid var(--line);text-align:left}