:root{--bg:#f8f8f2;--ink:#18372f;--muted:#62736b;--green:#24664f;--soft:#e8f0e2;--line:#dfe5d9;--white:#fffefb;--gold:#e9bd65;--radius:20px}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:16px;line-height:1.55}a{color:var(--green);text-decoration:none}a:hover{text-decoration:underline}button,input,textarea,select{font:inherit}button,a,input,textarea,summary{touch-action:manipulation}button{cursor:pointer}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(2rem,4vw,3.4rem);line-height:1.12;letter-spacing:-.04em;margin-bottom:18px}h2{font-size:1.35rem;letter-spacing:-.025em;line-height:1.4}h3{font-size:1.22rem;line-height:1.4;margin-bottom:10px}p{color:var(--muted)}:focus-visible{outline:3px solid #b47d21;outline-offset:4px;border-radius:5px}.skip{position:absolute;left:20px;top:-60px;background:white;padding:12px;z-index:5}.skip:focus{top:10px}.topbar{max-width:1360px;margin:auto;padding:27px 40px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;gap:20px}.brand{display:flex;gap:12px;align-items:center;color:var(--ink);font-size:20px;font-weight:750;letter-spacing:-.5px}.brand:hover{text-decoration:none}.brand-icon{display:grid;place-items:center;background:var(--green);color:white;width:45px;height:45px;border-radius:14px;font:700 20px ui-monospace,monospace}.brand small{display:block;font-size:8px;letter-spacing:1.4px;margin-top:1px;color:var(--muted);font-weight:650}.topbar nav{display:flex;align-items:center;gap:25px;font-size:14px;font-weight:600}.topbar form{margin:0}.header-note{font-size:13px;color:var(--muted)}.container{max-width:1160px;padding:44px 40px 70px;margin:auto;min-height:calc(100vh - 175px)}.footer{max-width:1280px;margin:auto;border-top:1px solid var(--line);padding:23px 40px;display:flex;justify-content:space-between;font-size:12px;color:var(--muted)}.eyebrow{font-size:10px;font-weight:750;letter-spacing:1.8px;color:var(--green);margin-bottom:16px}.lead{font-size:17px;line-height:1.65;max-width:750px;margin-bottom:0}.panel{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:30px;margin-bottom:22px}.button{display:inline-flex;align-items:center;justify-content:center;gap:24px;min-height:46px;border:1px solid var(--green);border-radius:10px;padding:12px 20px;background:var(--green);color:white;font-size:14px;font-weight:650;line-height:1.4;text-decoration:none}.button:hover{background:#174e3c;text-decoration:none}.button.secondary{background:transparent;color:var(--green);border-color:#bccdbc}.button.secondary:hover{background:var(--soft)}.text-button{display:inline-flex;align-items:center;min-height:44px;border:0;background:transparent;color:var(--green);font-size:14px;font-weight:650;padding:8px 0}.wide{width:100%;justify-content:space-between;margin-top:20px}label{display:block;font-size:13px;font-weight:650;color:var(--ink);margin:18px 0 8px}input,textarea,select{display:block;width:100%;background:#fff;border:1px solid #cdd7ca;border-radius:9px;padding:12px 13px;color:var(--ink);font-size:15px;max-width:100%}input,select{min-height:46px}textarea{resize:vertical;line-height:1.7}textarea[aria-invalid=true]{border:2px solid #a0442b}input:focus,textarea:focus{border-color:var(--green)}.hint{font-size:12px;margin:8px 0 15px;color:var(--muted)}.required{font-weight:400;color:var(--muted);font-size:12px}.alert{border-radius:12px;padding:16px 20px;margin-bottom:24px;font-size:14px;grid-column:1/-1}.error{background:#fff0e8;color:#923d24;border:1px solid #ebc6b7}.success{background:#e4f1e2;color:#255739;border:1px solid #c3dec0}.field-error{font-size:13px;color:#923d24;margin-top:8px}.login-layout{display:grid;grid-template-columns:1.2fr 1fr;align-items:center;gap:85px;padding-top:70px;padding-bottom:80px;min-height:calc(100vh - 170px)}.login-story h1{font-size:clamp(2.5rem,5vw,4rem)}.login-story .lead{max-width:390px;font-size:17px;margin-bottom:30px}.login-panel{padding:38px;margin:0;box-shadow:0 12px 45px #18372f07}.login-panel h2{font-size:27px;line-height:1.25;margin-bottom:12px}.login-panel>p:not(.eyebrow){font-size:14px}.login-panel .hint{margin:23px 0 0;text-align:center;font-size:12px}.code-card{background:#1b3a31;border-radius:17px;color:#edf4e5;box-shadow:0 14px 30px #24413112;transform:rotate(-1deg)}.code-label{display:flex;gap:20px;align-items:center;font-size:10px;color:#b6c9b9;padding:17px 20px;border-bottom:1px solid #ffffff16;letter-spacing:.6px}.dots{color:var(--gold);letter-spacing:3px;font-size:8px}.code-card pre{background:transparent;border:0;margin:0;padding:26px 22px;color:#e6efde;font-size:15px}.code-keyword{color:#b9d497}.code-number{color:#f4c96d}.code-string{color:#d7d4a6}.code-foot{padding:12px 20px;border-top:1px solid #ffffff16;font-size:11px;color:#bdd0c0}.story-note{display:flex;align-items:center;gap:15px;margin-top:25px}.story-note p{margin:0;font-size:12px}.round-icon{flex:none;display:grid;place-items:center;width:35px;height:35px;border-radius:50%;background:var(--soft);color:var(--green);font-size:19px;font-weight:600}.page-heading{display:flex;align-items:center;justify-content:space-between;gap:25px;margin:18px 0 36px}.tag{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);background:#f1f4ea;border-radius:50px;padding:7px 12px;font-size:11px;font-weight:600;color:var(--muted);max-width:100%}.tag.saved{color:#256047;background:#e7f0e0}.section-heading{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:20px}.section-heading h2{margin:0}.section-heading>span{font-size:12px;color:var(--muted)}.topic-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,320px),1fr));gap:24px}.topic-card{padding:30px;background:var(--white);border:1px solid var(--line);border-radius:var(--radius);position:relative;display:flex;flex-direction:column}.topic-icon{display:grid;place-items:center;background:var(--soft);color:var(--green);font:650 24px ui-monospace,monospace;width:55px;height:55px;border-radius:16px;margin-bottom:25px}.topic-card h3{font-size:25px;max-width:600px}.topic-card>p:not(.eyebrow){font-size:14px;max-width:760px}.card-bottom{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-top:auto;padding-top:22px}.history{margin-top:48px}.submission-list{border:1px solid var(--line);border-radius:var(--radius);background:var(--white);overflow:hidden}.submission-row{display:flex;justify-content:space-between;gap:25px;padding:22px 26px;color:var(--ink);border-bottom:1px solid var(--line);align-items:center}.submission-row:last-child{border:0}.submission-row:hover{background:#f3f7ed;text-decoration:none}.submission-row small{display:block;color:var(--muted);font-size:12px;margin-top:5px}.row-link{color:var(--green);font-size:13px;font-weight:650}.empty{padding:38px;text-align:center}.empty>span{font-size:28px;color:var(--green)}.empty h3{margin-top:10px}.empty p{font-size:13px;margin-bottom:0}.back-link{font-size:13px;font-weight:600}.practice-note{display:flex;gap:18px;align-items:center;padding:20px 25px;background:#eef2e7;border-radius:14px;margin-bottom:25px}.practice-note p{font-size:13px;margin:0;flex:1}.practice-note strong{color:var(--ink)}.question-form{max-width:850px;margin:auto}.answer-progress{font-size:12px;color:var(--green);text-align:right;margin:25px 0 15px}.question-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:28px;margin-bottom:22px}.question-heading{display:flex;align-items:flex-start;gap:15px;margin-bottom:20px}.question-heading h2{font-size:17px;margin:3px 0 0;letter-spacing:0}.question-number{display:grid;place-items:center;flex:none;width:32px;height:32px;background:var(--soft);color:var(--green);border-radius:10px;font-size:13px;font-weight:750}pre{background:#f2f5ec;color:#21392d;border:1px solid #e3e8db;border-radius:11px;padding:20px;overflow-x:auto;line-height:1.9;font-size:14px;margin:20px 0;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;max-width:100%}code{font-family:inherit}.code-input{font-family:ui-monospace,monospace;font-size:13px}.submit-panel{display:flex;justify-content:space-between;align-items:center;gap:20px;margin:30px 0;padding:26px;background:#e8efe0;border:1px solid #d8e3cd;border-radius:var(--radius)}.submit-panel p{font-size:12px;margin:6px 0 0}.saved-answer{white-space:pre-wrap;overflow-wrap:anywhere;background:#f3f6ec;padding:20px;border-radius:10px;font-family:ui-monospace,monospace;font-size:14px}.pagination{display:flex;justify-content:center;gap:20px;align-items:center;margin:25px 0;font-size:13px}.teacher-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.workspace-card{color:var(--ink);display:block}.workspace-card:hover{text-decoration:none;border-color:var(--green)}.workspace-card p{font-size:14px}.form-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.student-row,.version-row{display:flex;align-items:center;justify-content:space-between;gap:25px}.student-row h3,.version-row h3{margin:8px 0}.student-row p,.version-row p{font-size:13px;margin:0}.student-actions,.action-group{display:flex;flex-wrap:wrap;gap:12px;align-items:center}.action-group form{margin:0}.student-actions{flex:1;justify-content:flex-end}.student-actions details{min-width:170px}.student-actions summary{font-size:13px;font-weight:600;color:var(--green);cursor:pointer;padding:12px}.student-actions details form{padding:12px}.editor-actions{margin:20px 0}.publish-panel{margin-top:35px;display:flex;align-items:center;justify-content:space-between;gap:20px}.publish-panel p{font-size:13px;max-width:500px;margin-bottom:0}.filter-form{display:flex;flex-wrap:wrap;align-items:flex-end;gap:20px}.filter-form label{margin-top:0}.filter-form>div{flex:1;min-width:160px}.js-only{display:none}.js .js-only{display:inline-flex}
@media(min-width:1600px){.container{max-width:1280px}.login-layout{gap:140px}}@media(max-width:950px){.login-layout{gap:40px}.topbar{padding:22px 28px}.container{padding:35px 28px 55px}.login-panel{padding:28px}.login-story h1{font-size:3rem}.teacher-grid{grid-template-columns:1fr}.teacher-grid .panel{margin:0}.form-grid{grid-template-columns:1fr 1fr}.form-grid>div:last-child{grid-column:1/-1}.version-row,.student-row{align-items:flex-start}.version-row{flex-direction:column}.page-heading>.tag{display:none}.publish-panel{flex-direction:column;align-items:flex-start}}
@media(max-width:650px){.topbar{padding:18px 20px;align-items:flex-start;flex-wrap:wrap}.brand{font-size:18px}.brand-icon{width:40px;height:40px}.header-note{display:none}.topbar nav{gap:20px;font-size:12px;flex-wrap:wrap;width:100%}.container{padding:28px 18px 45px}.login-layout{display:block;padding-top:30px}.login-story .lead{font-size:15px;max-width:100%}.login-story h1{font-size:2.6rem}.login-story .code-card{margin-bottom:28px}.story-note{display:none}.login-panel{margin-top:30px;padding:26px}.code-card pre{font-size:13px;padding:22px 18px}.code-label{padding:14px 18px;gap:15px}.footer{padding:20px;font-size:11px;gap:20px}.page-heading{margin-bottom:25px}.page-heading h1{font-size:2.2rem}.lead{font-size:15px}.panel,.topic-card,.question-card{padding:22px}.topic-card h3{font-size:23px}.card-bottom{flex-direction:column;align-items:flex-start;gap:20px}.card-bottom .button{width:100%;justify-content:space-between}.section-heading>span{display:none}.submission-row{padding:19px;gap:15px;align-items:flex-start}.submission-row strong{font-size:14px}.submission-row small{font-size:11px}.submission-row .row-link{font-size:11px;white-space:nowrap}.practice-note{padding:18px;align-items:flex-start}.practice-note>.tag{display:none}.practice-note .round-icon{width:28px;height:28px;font-size:15px}.question-heading{gap:12px}.question-heading h2{font-size:15px}.question-number{width:28px;height:28px;font-size:12px}pre{font-size:12px;padding:15px;line-height:1.9}.submit-panel{padding:22px;flex-direction:column;align-items:flex-start}.submit-panel .button{width:100%;justify-content:space-between}.form-grid{grid-template-columns:1fr;gap:0}.form-grid>div:last-child{grid-column:auto}.student-row{flex-direction:column}.student-actions{justify-content:flex-start;width:100%}.publish-panel .button{width:100%}.publish-panel form{width:100%}.filter-form{gap:15px}.history{margin-top:32px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}