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.display-code-panel{margin-top:24px}.display-code-panel .inline-form{align-items:end}.display-code-panel .inline-form label{max-width:420px;flex:1}.folder-path{padding:12px 14px;background:#f1f7f3;border-radius:10px;color:#436153;font-family:ui-monospace,monospace;margin-bottom:14px}.folder-path a,.file-name a{color:#0d7556;font-weight:700;text-decoration:none}.file-list{display:grid}.file-row{display:flex;align-items:center;gap:12px;padding:13px 10px;border-bottom:1px solid #edf1ee}.file-row:last-child{border-bottom:0}.file-icon{font-size:1.15rem}.file-name{flex:1;overflow-wrap:anywhere}.file-row>.muted{font-size:.8rem;white-space:nowrap}

/* Hufhgus visual refresh: calm classroom neutrals with an editorial serif voice. */
:root{--ink:#252525;--muted:#6b6b6b;--line:#dedede;--paper:#fff;--white:#f4f4f4;--green:#343434;--green2:#171717;--mint:#e9e9e9;--coral:#aaa;--shadow:0 5px 18px #00000008}
body{background:#fff;color:var(--ink);font-family:Arial,Helvetica,sans-serif}
h1,h2,h3,strong,.brand,.button,.eyebrow{font-family:Georgia,'Times New Roman',serif;letter-spacing:normal}
h1{font-weight:400;letter-spacing:-.045em}h2{font-weight:400;letter-spacing:-.02em}
.topbar{min-height:60px;background:#fff;border-bottom:1px solid #eee;padding:9px max(calc((100vw - 1180px)/2),24px)}
.brand{font-size:1rem;font-style:italic;font-weight:400;gap:8px}.brand small{font:600 .55rem Arial,sans-serif;letter-spacing:.14em;color:#777}.mark{width:30px;height:30px;border-radius:50%;background:#ededed;color:#333;font:italic 1rem Georgia,serif}
.button{border-radius:12px;background:#ededed;border:1px solid #d2d2d2;color:#222;font-size:.95rem;font-weight:400}.button.primary{background:#dedede;color:#222;border-color:#aaa}.button.primary:hover{background:#d1d1d1;border-color:#888}.button.ghost{background:#fff}
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input,select,textarea{border-color:#c9c9c9;border-radius:11px}input:focus,select:focus,textarea:focus{border-color:#888;box-shadow:0 0 0 3px #0000000d}
.option{border-color:#d6d6d6;border-radius:13px;background:#fafafa}.option:hover:not(:disabled){border-color:#888;background:#eee}.option span{background:#e7e7e7;color:#333}.progress{background:#ddd}.progress i{background:#777}.book-icon{background:#e4e4e4;color:#555}
.flash{background:#f0f0f0;color:#333}.flash.error,.inline-error{background:#fff1f1;color:#8a2929;border-color:#e5caca}.status.online{color:#333}.status.online i,.live i{background:#777;box-shadow:0 0 0 3px #7772}.live{color:#444}.code,code{background:#e7e7e7;color:#333}
.home-page .page-wrap{max-width:980px;margin:0 auto;padding:20px 24px 55px}.home-page .topbar{max-width:980px;margin:auto;border:0}.home-page .brand .mark,.home-page .brand small{display:none}.home-page .home-nav .button{font:.8rem Arial,sans-serif;padding:6px 12px;border-radius:7px}
.home-hero{text-align:center;min-height:470px;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:24px 0 16px}.home-wordmark{font:italic clamp(3.5rem,9vw,6.2rem)/1 Georgia,'Times New Roman',serif;color:#111;text-decoration:none;letter-spacing:-.07em}.home-tagline{font:1.25rem/1.35 Georgia,'Times New Roman',serif;color:#696969;margin:22px 0 30px}.home-actions{display:grid;gap:13px;min-width:min(330px,90vw);padding:16px 18px;border:1px solid #bdbdbd;border-radius:21px}.home-actions .button{min-height:48px;font:1rem Arial,sans-serif}.home-actions .button.primary{border:1px solid #888}.home-teacher{margin-top:10px;color:#555;font:.82rem Georgia,serif}.home-about{text-align:center;max-width:680px;margin:0 auto 10px}.home-about h2{font-size:1.05rem;margin-bottom:9px}.home-about p{font:.9rem/1.55 Georgia,'Times New Roman',serif;color:#666}
.join-class{min-height:66vh;display:flex;flex-direction:column;align-items:center;justify-content:flex-start;padding:55px 16px 30px;text-align:center}.join-class h1{font-size:clamp(2.5rem,6vw,3.5rem);margin:12px 0 4px}.join-class>p:not(.eyebrow){font:1.3rem Georgia,serif;color:#696969;margin:10px 0 22px}.join-form{display:grid;justify-items:center;gap:13px;width:min(280px,100%)}.join-form input{width:180px;text-align:center;background:#e3e3e3;border:1px solid #aaa;border-radius:18px;font-size:1.2rem;letter-spacing:.18em;text-transform:uppercase}.join-form .button{font-size:.9rem;padding:9px 18px}
.joined-classes{margin-top:35px;width:min(650px,100%);text-align:left}.joined-classes h2{font-size:1.3rem}.joined-class-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:12px}.joined-class-list article{padding:15px;display:grid;gap:6px}.joined-class-list article span{font-size:.82rem;color:#666}.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:700px){.home-hero{min-height:400px}.home-tagline{font-size:1.1rem}.top-user{flex-wrap:wrap;justify-content:flex-end}.top-user>a{font-size:.85rem}}

/* Brighter classroom palette with familiar course cards and clear wayfinding. */
:root{--ink:#1d2945;--muted:#69758e;--line:#e2e8f4;--paper:#f5f7fc;--white:#fff;--green:#4f62d8;--green2:#394bb7;--mint:#e8edff;--coral:#ffad66;--red:#b54747;--shadow:0 10px 26px #24366b12}
body{background:var(--paper);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,'Segoe UI',sans-serif}
h1,h2,h3,strong,.button,.eyebrow{font-family:Inter,ui-sans-serif,system-ui,-apple-system,'Segoe UI',sans-serif;letter-spacing:normal}
h1{font-weight:750;letter-spacing:-.045em}h2{font-weight:700;letter-spacing:-.025em}h3{font-weight:700}
.topbar{background:#fff;border-bottom:1px solid var(--line);box-shadow:0 2px 12px #17255408}
.brand{font-family:Georgia,'Times New Roman',serif;font-weight:700;color:#26345e}.brand small{font-family:Inter,ui-sans-serif,system-ui,sans-serif;color:#6574d8}.mark{border-radius:12px;background:linear-gradient(145deg,#6677ed,#8c63dc);color:#fff;box-shadow:0 4px 10px #6677ed40}
.top-user>a{color:#4b5fd0}.top-user>a:hover{color:#293b9d}.top-user i{color:#6b7891}
.button{font-family:Inter,ui-sans-serif,system-ui,sans-serif;border:1px solid #dce3f2;background:#fff;color:#283654;border-radius:11px;font-weight:650;box-shadow:0 2px 5px #24366b0a}.button:hover{border-color:#aebbf2;box-shadow:0 5px 12px #465ac31c}.button.primary{background:linear-gradient(135deg,#586ce0,#715bce);border-color:#5969d0;color:#fff;box-shadow:0 5px 13px #596ce033}.button.primary:hover{background:linear-gradient(135deg,#485ccf,#634dbd);border-color:#485ccf}.button.ghost{background:#fff}
.panel,.metrics article{background:#fff;border-color:var(--line);border-radius:17px;box-shadow:var(--shadow)}.form-panel{box-shadow:0 6px 18px #24366b0c}.inner-panel{background:#fff;border-color:var(--line)}
.eyebrow{color:#596bd0;font-weight:750;letter-spacing:.1em}.page-heading h1{color:#1d2945}.page-heading p:last-child,.muted{color:var(--muted)}
input,select,textarea{border-color:#d8e0f0;color:var(--ink);border-radius:10px}input:focus,select:focus,textarea:focus{border-color:#6678e8;box-shadow:0 0 0 3px #6678e822}
.metrics article:nth-child(1){background:#eaf0ff}.metrics article:nth-child(2){background:#f1edff}.metrics article:nth-child(3){background:#fff1e8}.metrics article:nth-child(4){background:#e8f7f1}.metrics strong{color:#27345a}
.live{color:#327c62}.live i,.status.online i{background:#32b87c;box-shadow:0 0 0 3px #32b87c25}.status.online{color:#27845d}.status i{background:#a9b4c8}
.code,code{background:#edf0ff;color:#4255bd;border-radius:7px}.progress{background:#e7ebf5}.progress i{background:linear-gradient(90deg,#5e73e7,#48b89a)}.book-icon{background:linear-gradient(145deg,#e7edff,#f3eaff);color:#5b68cb}
.assignment-card{border-left:4px solid #7583e8}.assignment-card:nth-child(3n+2){border-left-color:#49b99a}.assignment-card:nth-child(3n){border-left-color:#f3a65f}
.option{background:#fff;border:1px solid #dfe5f2;color:#263450}.option:hover:not(:disabled){border-color:#7382e4;background:#f6f7ff}.option span{background:#edf0ff;color:#5365cf}.feedback{background:#edf7f1;color:#1d654b}.feedback p{color:#286f52}
.flash{background:#eaf7f0;color:#246c4e;border:1px solid #ccebd9}.flash.error,.inline-error{background:#fff0ef;color:#963f3a;border-color:#f2d0cd}
.home-page .page-wrap{background:radial-gradient(ellipse at 50% 24%,#eef0ff 0,transparent 56%);max-width:none}.home-page .topbar{max-width:none;padding-left:max(calc((100vw - 1180px)/2),24px);padding-right:max(calc((100vw - 1180px)/2),24px)}.home-wordmark{color:#27345e}.home-tagline{font-family:Inter,ui-sans-serif,system-ui,sans-serif;color:#68748e}.home-actions{border:1px solid #dfe4f4;background:#ffffffd9;box-shadow:0 12px 32px #35488f12;border-radius:20px}.home-actions .button{font-family:Inter,ui-sans-serif,system-ui,sans-serif}.home-actions .button.primary{border-color:#586ce0}.home-about h2{color:#394a85}.home-about p{font-family:Inter,ui-sans-serif,system-ui,sans-serif;color:#68748e}
.join-class{background:radial-gradient(ellipse at 50% 12%,#edf0ff 0,transparent 58%);border-radius:24px}.join-class h1{color:#29365e}.join-class>p:not(.eyebrow){font:1.1rem Inter,ui-sans-serif,system-ui,sans-serif;color:#69758e}.join-form input{background:#fff;border:2px solid #cbd4f0;box-shadow:0 5px 16px #24366b0b}.joined-class-list article{border-left:4px solid #7583e8}.joined-class-list article:nth-child(3n+2){border-left-color:#49b99a}.joined-class-list article:nth-child(3n){border-left-color:#f3a65f}
@media(max-width:700px){.topbar{padding:10px 14px}.page-wrap{padding-left:16px;padding-right:16px}.home-page .topbar{padding-left:14px;padding-right:14px}.metrics article{padding:14px}}
.join-form input{width:min(260px,84vw);max-width:100%;letter-spacing:.12em}

/* Brighter classroom palette with familiar course cards and clear wayfinding. */
:root{--ink:#1d2945;--muted:#69758e;--line:#e2e8f4;--paper:#f5f7fc;--white:#fff;--green:#4f62d8;--green2:#394bb7;--mint:#e8edff;--coral:#ffad66;--red:#b54747;--shadow:0 10px 26px #24366b12}
body{background:var(--paper);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,'Segoe UI',sans-serif}
h1,h2,h3,strong,.button,.eyebrow{font-family:Inter,ui-sans-serif,system-ui,-apple-system,'Segoe UI',sans-serif;letter-spacing:normal}
h1{font-weight:750;letter-spacing:-.045em}h2{font-weight:700;letter-spacing:-.025em}h3{font-weight:700}
.topbar{background:#fff;border-bottom:1px solid var(--line);box-shadow:0 2px 12px #17255408}
.brand{font-family:Georgia,'Times New Roman',serif;font-weight:700;color:#26345e}.brand small{font-family:Inter,ui-sans-serif,system-ui,sans-serif;color:#6574d8}.mark{border-radius:12px;background:linear-gradient(145deg,#6677ed,#8c63dc);color:#fff;box-shadow:0 4px 10px #6677ed40}
.top-user>a{color:#4b5fd0}.top-user>a:hover{color:#293b9d}.top-user i{color:#6b7891}
.button{font-family:Inter,ui-sans-serif,system-ui,sans-serif;border:1px solid #dce3f2;background:#fff;color:#283654;border-radius:11px;font-weight:650;box-shadow:0 2px 5px #24366b0a}.button:hover{border-color:#aebbf2;box-shadow:0 5px 12px #465ac31c}.button.primary{background:linear-gradient(135deg,#586ce0,#715bce);border-color:#5969d0;color:#fff;box-shadow:0 5px 13px #596ce033}.button.primary:hover{background:linear-gradient(135deg,#485ccf,#634dbd);border-color:#485ccf}.button.ghost{background:#fff}
.panel,.metrics article{background:#fff;border-color:var(--line);border-radius:17px;box-shadow:var(--shadow)}.form-panel{box-shadow:0 6px 18px #24366b0c}.inner-panel{background:#fff;border-color:var(--line)}
.eyebrow{color:#596bd0;font-weight:750;letter-spacing:.1em}.page-heading h1{color:#1d2945}.page-heading p:last-child,.muted{color:var(--muted)}
input,select,textarea{border-color:#d8e0f0;color:var(--ink);border-radius:10px}input:focus,select:focus,textarea:focus{border-color:#6678e8;box-shadow:0 0 0 3px #6678e822}
.metrics article:nth-child(1){background:#eaf0ff}.metrics article:nth-child(2){background:#f1edff}.metrics article:nth-child(3){background:#fff1e8}.metrics article:nth-child(4){background:#e8f7f1}.metrics strong{color:#27345a}
.live{color:#327c62}.live i,.status.online i{background:#32b87c;box-shadow:0 0 0 3px #32b87c25}.status.online{color:#27845d}.status i{background:#a9b4c8}
.code,code{background:#edf0ff;color:#4255bd;border-radius:7px}.progress{background:#e7ebf5}.progress i{background:linear-gradient(90deg,#5e73e7,#48b89a)}.book-icon{background:linear-gradient(145deg,#e7edff,#f3eaff);color:#5b68cb}
.assignment-card{border-left:4px solid #7583e8}.assignment-card:nth-child(3n+2){border-left-color:#49b99a}.assignment-card:nth-child(3n){border-left-color:#f3a65f}
.option{background:#fff;border:1px solid #dfe5f2;color:#263450}.option:hover:not(:disabled){border-color:#7382e4;background:#f6f7ff}.option span{background:#edf0ff;color:#5365cf}.feedback{background:#edf7f1;color:#1d654b}.feedback p{color:#286f52}
.flash{background:#eaf7f0;color:#246c4e;border:1px solid #ccebd9}.flash.error,.inline-error{background:#fff0ef;color:#963f3a;border-color:#f2d0cd}
.home-page .page-wrap{background:radial-gradient(ellipse at 50% 24%,#eef0ff 0,transparent 56%);max-width:none}.home-page .topbar{max-width:none;padding-left:max(calc((100vw - 1180px)/2),24px);padding-right:max(calc((100vw - 1180px)/2),24px)}.home-wordmark{color:#27345e}.home-tagline{font-family:Inter,ui-sans-serif,system-ui,sans-serif;color:#68748e}.home-actions{border:1px solid #dfe4f4;background:#ffffffd9;box-shadow:0 12px 32px #35488f12;border-radius:20px}.home-actions .button{font-family:Inter,ui-sans-serif,system-ui,sans-serif}.home-actions .button.primary{border-color:#586ce0}.home-about h2{color:#394a85}.home-about p{font-family:Inter,ui-sans-serif,system-ui,sans-serif;color:#68748e}
.join-class{background:radial-gradient(ellipse at 50% 12%,#edf0ff 0,transparent 58%);border-radius:24px}.join-class h1{color:#29365e}.join-class>p:not(.eyebrow){font:1.1rem Inter,ui-sans-serif,system-ui,sans-serif;color:#69758e}.join-form input{background:#fff;border:2px solid #cbd4f0;box-shadow:0 5px 16px #24366b0b}.joined-class-list article{border-left:4px solid #7583e8}.joined-class-list article:nth-child(3n+2){border-left-color:#49b99a}.joined-class-list article:nth-child(3n){border-left-color:#f3a65f}
@media(max-width:700px){.topbar{padding:10px 14px}.page-wrap{padding-left:16px;padding-right:16px}.home-page .topbar{padding-left:14px;padding-right:14px}.metrics article{padding:14px}}

.file-preview-panel,.file-source-panel,.file-permissions{margin:18px 0;padding:20px 22px}.html-preview{display:block;width:100%;height:min(68vh,720px);border:1px solid #dce3f2;border-radius:12px;background:white}.source-note{margin:16px 0;background:#fff8e9;border-color:#f4ddad}.source-note p{margin:.4rem 0 0}.file-editor{display:grid;gap:12px}.file-editor textarea{min-height:56vh;font:13px/1.55 ui-monospace,SFMono-Regular,Consolas,monospace;white-space:pre;tab-size:4}.source-view{max-height:70vh;overflow:auto;padding:18px;background:#f4f6fb;border:1px solid #e2e7f1;border-radius:12px;font:13px/1.55 ui-monospace,SFMono-Regular,Consolas,monospace;white-space:pre-wrap;overflow-wrap:anywhere}.permission-form{display:flex;align-items:flex-end;flex-wrap:wrap;gap:10px}.permission-form label{display:grid;gap:5px;font-size:.86rem;font-weight:650}.permission-form select{min-width:230px}.file-access{margin-left:auto}.file-access summary{cursor:pointer;color:#596bd0;font-size:.82rem;font-weight:700}.file-access .permission-form{padding:12px;position:absolute;z-index:3;background:white;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow)}.file-row{flex-wrap:wrap}.file-row .file-name a{color:#4b5fd0}.file-row .file-name a:hover{text-decoration:underline}
.file-access{position:relative}
.upload-panel{margin-bottom:18px}.upload-form{display:flex;align-items:flex-end;gap:14px;flex-wrap:wrap}.upload-form label{display:grid;gap:7px;font-size:.88rem;font-weight:650}.upload-form input[type=file]{max-width:min(100%,420px);padding:9px;background:#f7f8fc;border:1px solid var(--line);border-radius:10px}.file-access{width:min(100%,460px);padding:10px 12px}.file-access[open]{background:#f8f9ff;border:1px solid var(--line);border-radius:12px}.file-access summary{padding:5px}.file-access h3{font-size:.95rem;margin:15px 0 8px}.file-access .permission-form{position:static;display:grid;align-items:start;gap:10px;max-width:100%;padding:12px 0;background:transparent;border:0;border-radius:0;box-shadow:none}.visibility-form select[multiple]{min-width:min(100%,360px);height:auto}.visibility-form fieldset{display:flex;flex-wrap:wrap;gap:10px;border:1px solid var(--line);border-radius:10px;padding:9px 12px}.visibility-form fieldset legend{padding:0 5px;font-size:.82rem;font-weight:700}.visibility-form .check-label{display:flex;align-items:center;gap:6px}.visibility-form small{font-size:.75rem}.remove-form{margin-top:12px;padding-top:12px;border-top:1px solid var(--line)}.button.danger{background:#fff0f0;color:#b4232f;border:1px solid #f1c6ca}.file-permissions h3{margin:18px 0 8px}.file-permissions hr{border:0;border-top:1px solid var(--line);margin:18px 0}
.upload-options{display:grid;gap:14px}.upload-options .upload-form{padding:14px;border:1px solid var(--line);border-radius:12px;background:#fbfdfb}