:root{--text:#241f33;--muted:#6c6480;--bg:#f8f6fb;--surface:#fff;--border:#e7e2ef;--accent:#6d28d9;--accent-strong:#591fb8;--accent-soft:#efe7fc;--error:#b91c1c;--good:#187a4a;--good-soft:#e3f5ec;--warn:#a15c07;--warn-soft:#fbeed9;--ink:#221c33;--ink-line:#4a3d70;--ink-text:#cdc3e6;--ink-text-strong:#fff;--shadow:0 1px 2px #221c330f, 0 1px 1px #221c330a;color:var(--text);background:var(--bg);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;font:16px/1.5 Public Sans,system-ui,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}body{margin:0}#root{flex-direction:column;min-height:100svh;display:flex}h1,h2,h3{text-wrap:balance;font-family:"Source Serif 4",Georgia,Times New Roman,serif}.icon{flex:none;width:18px;height:18px}h1{margin:0 0 16px;font-size:28px}.auth-page{background:var(--surface);border:1px solid var(--border);border-radius:10px;max-width:360px;margin:64px auto;padding:32px}.auth-page form{flex-direction:column;gap:14px;display:flex}.auth-page label{color:var(--muted);flex-direction:column;gap:4px;font-size:14px;display:flex}.auth-page input,.auth-page select{font:inherit;border:1px solid var(--border);border-radius:6px;padding:8px 10px}.auth-page button{font:inherit;background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:7px;padding:10px}.auth-page button:hover:not(:disabled){background:var(--accent-strong)}.auth-page button:disabled{opacity:.6;cursor:default}.auth-page p{color:var(--muted);margin-top:16px;font-size:14px}.error{color:var(--error);margin:0;font-size:14px}.link-button{font:inherit;color:var(--accent);cursor:pointer;background:0 0;border:none;padding:0;font-size:14px;text-decoration:underline}.link-button:disabled{opacity:.6;cursor:default}.status{text-align:center;color:var(--muted);margin-top:64px}.app-header{background:var(--ink);justify-content:space-between;align-items:center;gap:24px;padding:12px 24px;display:flex}.brand{color:var(--ink-text-strong);white-space:nowrap;align-items:center;gap:8px;font-family:"Source Serif 4",Georgia,serif;font-size:18px;font-weight:700;text-decoration:none;display:flex}.brand-mark{background:var(--accent);border-radius:3px;width:8px;height:8px;display:inline-block}.app-header nav{flex:1;gap:18px;display:flex}.app-header nav a{color:var(--ink-text);font-size:14px;font-weight:500;text-decoration:none}.app-header nav a:hover{color:var(--ink-text-strong)}.app-header-user{color:var(--ink-text);flex:none;align-items:center;gap:12px;font-size:14px;display:flex}.app-header-user-name{white-space:nowrap}@media (width<=480px){.app-header{gap:10px;padding:12px 14px}.app-header nav{gap:12px}.app-header-user-name{display:none}}.app-header-user button{font:inherit;border:1px solid var(--ink-line);color:var(--ink-text-strong);cursor:pointer;background:0 0;border-radius:6px;padding:7px 13px}.app-header-user button:hover:not(:disabled){background:#ffffff14}.app-header-user button:disabled,.action-box button:disabled{opacity:.6;cursor:default}.action-box button{font:inherit;border:1px solid var(--border);background:var(--surface);cursor:pointer;border-radius:6px;padding:8px 14px}.action-box button:hover:not(:disabled){border-color:var(--accent);color:var(--accent)}main{width:100%;max-width:720px;margin:0 auto;padding:32px 24px}main.wide{max-width:1080px}.new-course-form{background:var(--surface);border:1px solid var(--border);border-radius:10px;flex-direction:column;gap:14px;max-width:400px;margin:20px 0 32px;padding:20px;display:flex}.new-course-form h2,.new-course-form h3{margin:0;font-size:16px}.new-course-form label{color:var(--muted);flex-direction:column;gap:4px;font-size:14px;display:flex}.new-course-form input,.new-course-form textarea{font:inherit;border:1px solid var(--border);resize:vertical;border-radius:6px;padding:8px 10px}.new-course-form button{font:inherit;background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:7px;align-self:flex-start;padding:10px}.new-course-form button:hover:not(:disabled){background:var(--accent-strong)}.new-course-form button:disabled{opacity:.6;cursor:default}.course-list{flex-direction:column;gap:10px;max-width:720px;padding:0;list-style:none;display:flex}.course-list li{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:12px 16px}.course-list a{color:var(--accent);font-weight:500;text-decoration:none}.course-list a:hover{text-decoration:underline}.course-teacher{color:var(--muted);font-size:14px}.action-box{background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow);border-radius:12px;margin:20px 0;padding:18px 20px}.card-header{justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px;display:flex}.card-header .title{align-items:center;gap:9px;display:flex}.card-header h2{margin:0;font-size:17px}.card-header .icon{color:var(--accent)}.assignment-list{flex-direction:column;gap:8px;padding:0;list-style:none;display:flex}.assignment-list li{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:10px 14px}.submission-list{flex-direction:column;gap:12px;padding:0;list-style:none;display:flex}.submission-list li{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:14px}.submission-list .new-course-form{max-width:320px;margin-top:10px}.badge{border-radius:999px;padding:2px 8px;font-size:12px;font-weight:600;display:inline-block}.settings-danger-zone{border-top:1px solid var(--border);margin-top:18px;padding-top:16px}.badge-pending{color:var(--warn);background:var(--warn-soft)}.badge-active{color:var(--good);background:var(--good-soft)}.badge-rejected,.badge-dropped{color:var(--error);background:color-mix(in srgb, var(--error) 12%, transparent)}.badge-completed{color:var(--muted);background:var(--border)}.enrollment-code{letter-spacing:.04em;background:var(--bg);border:1px solid var(--border);border-radius:6px;padding:3px 8px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:15px;font-weight:600}.quiz-badge{color:var(--accent-strong);background:var(--accent-soft);border-radius:999px;margin-left:6px;padding:2px 8px;font-size:12px;font-weight:600;display:inline-block}.checkbox-label{align-items:center;flex-direction:row!important;gap:8px!important}.quiz-builder{border-top:1px solid var(--border);flex-direction:column;gap:16px;padding-top:8px;display:flex}.quiz-builder-question{background:var(--bg);border:1px solid var(--border);border-radius:6px;flex-direction:column;gap:8px;padding:12px;display:flex}.quiz-builder-option{align-items:center;gap:8px;display:flex}.quiz-builder-option input[type=text],.quiz-builder-option input:not([type=radio]){flex:1}.quiz-history ul,.quiz-result ul{color:var(--muted);margin:8px 0 0;padding:0;font-size:14px;list-style:none}.quiz-result{margin-bottom:12px}.quiz-taker fieldset{border:1px solid var(--border);border-radius:6px;margin:0;padding:12px}.quiz-taker legend{padding:0 6px;font-weight:500}.quiz-option-label{align-items:center;padding:4px 0;flex-direction:row!important;gap:8px!important;display:flex!important}.data-table-wrapper{border:1px solid var(--border);border-radius:8px;margin:20px 0;overflow-x:auto}.data-table{border-collapse:collapse;width:100%;font-size:14px}.data-table th,.data-table td{border-bottom:1px solid var(--border);text-align:left;white-space:nowrap;padding:8px 12px}.data-table th{background:var(--bg);font-weight:600}.data-table td.data-table-center,.data-table th.data-table-center{text-align:center;font-variant-numeric:tabular-nums}.data-table tbody tr:last-child td{border-bottom:none}.inline-reset-form{align-items:center;gap:6px;display:flex}.inline-reset-form input{font:inherit;border:1px solid var(--border);border-radius:6px;width:140px;padding:4px 8px}.inline-reset-form button:not(.link-button){font:inherit;background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:6px;padding:4px 10px}.inline-reset-form button:disabled{opacity:.6;cursor:default}.course-shell{grid-template-columns:230px 1fr;align-items:start;gap:24px;display:grid}.course-content{flex-direction:column;gap:4px;min-width:0;display:flex}.content-intro{flex-direction:column;gap:6px;margin-bottom:8px;display:flex}.course-rail{background:var(--ink);color:var(--ink-text);border-radius:14px;flex-direction:column;gap:16px;padding:20px 14px 24px;display:flex;position:sticky;top:88px}.rail-back{letter-spacing:.02em;text-transform:uppercase;color:var(--ink-text);align-items:center;gap:6px;padding:0 8px;font-size:12.5px;font-weight:600;text-decoration:none;display:flex}.rail-back:hover{color:var(--ink-text-strong)}.rail-course-name{color:var(--ink-text-strong);padding:0 8px;font-family:"Source Serif 4",Georgia,serif;font-size:16px;font-weight:600;line-height:1.3}.rail-nav{border-top:1px solid var(--ink-line);flex-direction:column;gap:2px;padding-top:10px;display:flex}.rail-nav a{color:var(--ink-text);border-radius:7px;align-items:center;gap:10px;padding:8px;font-size:13.5px;font-weight:500;text-decoration:none;display:flex}.rail-nav a:hover{color:var(--ink-text-strong);background:#ffffff14}@media (width<=760px){.course-shell{grid-template-columns:1fr}.course-rail{flex-direction:row;align-items:center;gap:12px;padding:14px;position:static;overflow-x:auto}.rail-back,.rail-course-name{display:none}.rail-nav{border-top:none;flex-direction:row;padding-top:0}.rail-nav a{white-space:nowrap}}