@font-face{font-family:PTSans;src:url('/static/fonts/pt-sans.ttf') format('truetype');font-weight:400;font-display:swap}@font-face{font-family:PTSans;src:url('/static/fonts/pt-sans-bold.ttf') format('truetype');font-weight:700;font-display:swap}
:root{font-family:PTSans,Arial,sans-serif;color:#24282e;background:#f6f4ef;font-size:18px;line-height:1.55;--ink:#24282e;--muted:#626973;--line:#d9dce0;--blue:#235aca;--green:#246748;--amber:#895912}*{box-sizing:border-box}body{margin:0}a{color:var(--blue);text-underline-offset:4px}button,input,textarea,select{font:inherit}button,.button{min-height:48px;padding:10px 19px;border:1px solid var(--line);border-radius:8px;background:white;color:var(--ink);cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:700;line-height:1.35}button:hover,.button:hover{border-color:var(--blue);background:#f4f7fc}button.primary,.button.primary{background:var(--blue);color:white;border-color:var(--blue)}button:disabled{opacity:.55;cursor:wait}button.danger{color:#a02a2a}input:not([type=checkbox]),textarea,select{width:100%;padding:12px;border:1px solid #89939f;border-radius:7px;background:white;color:var(--ink);min-height:48px}input[type=checkbox]{width:22px;height:22px;vertical-align:middle;accent-color:var(--blue);margin-right:10px}textarea{min-height:110px;resize:vertical}label{display:block;font-weight:700;margin:12px 0 5px}label.check{padding:9px 0;font-weight:400}small,.small{font-size:14px;color:var(--muted)}p{margin:10px 0 18px}h1,h2,h3{line-height:1.25;margin:0 0 16px}h1{font-size:32px;letter-spacing:-.6px}h2{font-size:25px}h3{font-size:21px}hr{border:0;border-top:1px solid var(--line);margin:24px 0}header{border-bottom:1px solid var(--line);background:#fffefa}header .head{max-width:1240px;margin:auto;padding:18px 26px;display:flex;align-items:center;justify-content:space-between;gap:18px}.brand{color:var(--ink);text-decoration:none;font-size:23px;font-weight:700;letter-spacing:-.5px}.brand small{display:block;font-weight:400;letter-spacing:0;font-size:14px}.identity{display:flex;align-items:center;gap:14px}.identity span{font-size:16px}.layout{max-width:1240px;display:grid;grid-template-columns:205px minmax(0,1fr);gap:38px;margin:34px auto;padding:0 26px}.nav{display:flex;flex-direction:column;gap:8px;align-self:start;position:sticky;top:20px}.nav a{padding:12px 15px;min-height:48px;border-radius:7px;color:var(--muted);text-decoration:none;font-weight:700}.nav a[aria-current=page]{background:#e6edf9;color:#174baf}.content{min-width:0;max-width:950px}.eyebrow{font-size:14px;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--muted);margin-bottom:8px}.card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:25px;margin-bottom:20px}.card h2:last-child,.card p:last-child{margin-bottom:0}.stack{display:flex;flex-direction:column;gap:16px}.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.spread{justify-content:space-between}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.badge{font-size:14px;background:#eef0f3;color:#515965;padding:4px 10px;border-radius:5px;display:inline-block}.badge.success{background:#e6f3e9;color:var(--green)}.badge.warning{background:#fff0d8;color:var(--amber)}.notice{border-left:3px solid var(--blue);padding:13px 17px;background:#edf2fb;border-radius:4px;margin:16px 0}.notice.error{background:#fff0ec;border-color:#a02a2a;color:#842828}.muted{color:var(--muted)}.empty{padding:38px 24px;text-align:center;background:#fffefa;border:1px dashed #b9bec6;border-radius:10px}.login{max-width:470px;margin:70px auto;padding:30px}.login button{width:100%;margin-top:20px}.task{scroll-margin-top:20px}.task-number{font-size:14px;color:var(--muted);margin-bottom:10px}.statement{font-size:21px;line-height:1.7;overflow-x:auto;margin:16px 0 24px}.save-label{font-size:14px;color:var(--green);min-height:24px}.upload-box{padding:16px;border:1px dashed #9faabe;border-radius:8px;background:#f9fafc;margin-top:16px}.file-input{position:absolute;width:1px;height:1px;opacity:0;overflow:hidden}.file-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:14px;margin:15px 0}.file{border:1px solid var(--line);border-radius:8px;padding:12px;min-width:0}.file img{width:100%;height:180px;object-fit:contain;background:#f4f4f2}.file .filename{font-size:14px;overflow-wrap:anywhere}.file button{min-width:44px;min-height:44px;padding:8px;font-size:14px}.file progress{width:100%}.feedback{background:#eef5ee;border-left:3px solid var(--green);padding:18px;border-radius:5px;white-space:pre-wrap}.feedback p{margin:0}.sticky-action{position:sticky;bottom:16px;display:flex;align-items:center;justify-content:space-between;gap:18px;border:1px solid var(--line);border-radius:10px;background:#fffefa;padding:18px;box-shadow:0 3px 12px #24282e0c}.checklist{max-height:240px;overflow:auto;border:1px solid var(--line);border-radius:7px;padding:8px 12px}.work-review{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:20px}.work-review img{max-width:100%;border:1px solid var(--line)}.report{border:1px solid var(--line);padding:18px;border-radius:8px;margin-top:15px}.report li{margin:10px 0}.table-wrap{overflow:auto}table{border-collapse:collapse;width:100%;font-size:16px}th,td{text-align:left;padding:12px;border-bottom:1px solid var(--line);vertical-align:top}th{color:var(--muted);font-weight:700}details{border-top:1px solid var(--line);padding:12px 0}summary{cursor:pointer;min-height:44px;padding:8px 0;font-weight:700}.form-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}.narrow{max-width:670px}.prewrap{white-space:pre-wrap;overflow-wrap:anywhere}.source-link{display:inline-block;padding:5px 0;margin-right:12px}.timeline{border-left:2px solid var(--line);padding-left:18px}.timeline p{font-size:16px}.alert-root{position:fixed;bottom:22px;right:22px;z-index:100;max-width:480px;background:#24282e;color:white;padding:16px 22px;border-radius:8px;box-shadow:0 4px 20px #0002}.hidden,[hidden]{display:none!important}:focus-visible{outline:3px solid #245bd2;outline-offset:4px}.skip{position:absolute;top:-100px;left:20px;background:white;padding:10px;z-index:300}.skip:focus{top:10px}.busy{color:var(--muted);padding:50px 0}dialog{border:1px solid var(--line);border-radius:12px;padding:26px;width:min(660px,calc(100% - 32px));max-height:90vh}dialog::backdrop{background:#14203255}dialog .close{float:right}.katex{font-size:1.15em}.katex-display{overflow:auto;padding:8px 0}.toolbar{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:24px}.danger-zone{margin-top:30px}audio{max-width:100%}
@media(max-width:960px){.layout{grid-template-columns:165px minmax(0,1fr);gap:22px;padding:0 18px}.card{padding:20px}.work-review,.grid{grid-template-columns:1fr}.nav a{padding:11px}}
@media(max-width:640px){:root{font-size:17px}header .head{padding:14px 18px}.brand{font-size:21px}.identity span{display:none}.layout{display:block;margin:25px auto 110px;padding:0 16px}.nav.student{position:fixed;z-index:50;bottom:0;top:auto;left:0;right:0;flex-direction:row;justify-content:space-around;background:#fffefa;border-top:1px solid var(--line);padding:8px 4px calc(8px + env(safe-area-inset-bottom));gap:0}.nav.student a{font-size:14px;padding:12px 9px;border-radius:6px;min-width:24%;text-align:center}.nav.teacher{position:static;flex-direction:row;overflow:auto;margin-bottom:24px;padding-bottom:7px}.nav.teacher a{white-space:nowrap;font-size:16px}h1{font-size:28px}h2{font-size:23px}.card{padding:19px;margin-bottom:16px}.login{margin:30px 16px;padding:24px}.file-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.file img{height:140px}.file{padding:9px}.sticky-action{bottom:90px;flex-direction:column;align-items:stretch;padding:15px}.sticky-action button{width:100%}.alert-root{bottom:100px;left:16px;right:16px;font-size:16px}.statement{font-size:19px}.row .button,.row button{flex-grow:0}.toolbar button{flex:1}.task-number{font-size:14px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation:none!important;transition:none!important}}
input.file-input{position:absolute;width:1px!important;min-height:1px!important;height:1px;padding:0;border:0;clip-path:inset(50%);overflow:hidden}label.button:has(+input:focus-visible){outline:3px solid #245bd2;outline-offset:4px}.assignment-row{background:transparent;border:0;border-bottom:1px solid var(--line);border-radius:0;padding:24px 0;margin-bottom:0}.assignment-row .row{align-items:flex-start}.content>p{max-width:70ch}.work-review{align-items:start}
@media(max-width:640px){.sticky-action{position:static;margin:24px 0;box-shadow:none}}
.statement .katex{display:inline-block;max-width:100%;overflow-x:auto;overflow-y:hidden;vertical-align:middle;white-space:nowrap;padding:3px 0}

/* Authentication is a standalone layout, not the hidden navigation column. */
.layout.auth-layout{display:block;max-width:1240px;margin:0 auto;padding:56px 24px 72px}
.auth-layout .content{width:100%;max-width:none}
.auth-layout .login{width:100%;max-width:480px;margin:0 auto;padding:36px 38px}
.login h1{font-size:32px;letter-spacing:-.5px;margin-bottom:14px}
.login .login-intro{margin-bottom:26px;line-height:1.55}
.login input{min-width:0}
.login .login-help{margin:20px 0 0}
.login .login-footer{padding-top:22px;margin-top:26px;border-top:1px solid var(--line)}
.login .login-footer p{margin-top:12px}
.login .login-links{display:flex;flex-wrap:wrap;gap:12px 24px}
#main:focus{outline:none}
.boot-error{max-width:540px;margin:0 auto}
@media(max-width:640px){.layout.auth-layout{padding:28px 16px 40px;margin:0 auto}.auth-layout .login{padding:26px 24px}.login h1{font-size:28px}}
@media(max-width:360px){.auth-layout .login{padding:24px 18px}.login h1{font-size:26px}}

.assignment-conditions{margin:24px 0}.assignment-conditions[open]>summary{margin-bottom:16px}.login #code-help{margin:10px 0 0}.login .login-intro{margin-bottom:20px}.login .login-footer{margin-top:24px;padding-top:20px}button:disabled{cursor:not-allowed}label.button.primary{background:var(--blue);border-color:var(--blue);color:white}

.file img{height:auto!important;aspect-ratio:1;object-fit:contain}.review-preview{display:block;aspect-ratio:1;background:#f9fafc;overflow:hidden}.work-review .review-preview img{width:100%;height:100%;object-fit:contain}
@media(max-width:640px){.nav.teacher{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:4px;overflow:visible;padding:0}.nav.teacher a{min-width:0;text-align:center;padding:12px 6px;font-size:15px}}