/* Batch 6: Homework Help only, reusing the approved interior theme. */
.library-app .homework-shell .homework{--hw-green:var(--brand);--hw-line:var(--line);}
.library-app .homework-shell .homework-heading{align-items:center;gap:16px;padding:16px 22px;border:1px solid #d5dce7;border-radius:22px;background:linear-gradient(115deg,#edf1f7,#f6f3eb);margin-bottom:14px;}
.library-app .homework-shell .homework h1{font-size:clamp(1.75rem,2.5vw,2.25rem);line-height:1.15;margin-bottom:6px;}
.library-app .homework-shell .homework-heading p{font-size:.9375rem;line-height:1.5;}
.library-app .homework-shell .homework h2{font-size:1.125rem;line-height:1.3;margin-bottom:10px;}
.library-app .homework-shell .homework .button{border-color:var(--line-strong);border-radius:12px;color:var(--brand-deep);min-height:40px;}
.library-app .homework-shell .homework .button[data-primary=true]{background:var(--brand);border-color:var(--brand);color:white;}
.library-app .homework-shell .homework .button[data-primary=true]:hover:not(:disabled){background:var(--brand-deep);border-color:var(--brand-deep);color:white;}
.library-app .homework-shell .homework-toolbar{padding:0 4px;gap:16px;margin-bottom:14px;flex:none;}
.library-app .homework-shell .homework-toolbar label{display:flex;flex-direction:row;align-items:center;gap:12px;font-size:.8125rem;}
.library-app .homework-shell .homework-toolbar select{width:260px;min-height:40px;padding:8px 12px;}
.library-app .homework-shell .homework-save-state{font-size:.8125rem;color:var(--brand-deep);}
.library-app .homework-shell .homework-layout{grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:16px;background:transparent;border:0;border-radius:0;overflow:visible;}
.library-app .homework-shell :is(.homework-question-pane,.homework-help-pane){padding:18px 20px;background:white;border:1px solid var(--line);border-radius:20px;box-shadow:0 3px 12px #0b234606;}
.library-app .homework-shell .homework .homework-question-input{font-family:"IBM Plex Sans",system-ui,sans-serif;font-size:.9375rem!important;}
.library-app .homework-shell .homework-question-scroll>.homework-empty{font-size:.875rem;line-height:1.5;}
.library-app .homework-shell .homework-help-actions{padding:10px;border:1px solid var(--line);border-radius:14px;background:var(--brand-soft);gap:8px;}
.library-app .homework-shell .homework-help-actions .button{border-color:var(--line);background:#fcfaf3;font-size:.8125rem;}
.library-app .homework-shell .homework-context{font-size:.8125rem;line-height:1.45;}
.library-app .homework-shell .homework-answer{background:var(--brand-soft);border:1px solid var(--line);border-radius:14px;font-family:"IBM Plex Sans",system-ui,sans-serif;font-size:.9375rem;}
.library-app .homework-shell .homework-messages{font-size:.9375rem;}
.library-app .homework-shell .homework-turn>p{font-size:.8125rem;}
.library-app .homework-shell .homework-sources{font-size:.75rem;}
.library-app .homework-shell .homework-file{border-radius:12px;background:var(--surface-muted);}
.library-app .homework-shell .homework-file.selected{border-color:#a6b9d4;}
.library-app .homework-shell .homework-preview{border-radius:14px;}
.library-app .homework-shell .homework-preview-head{background:var(--surface-muted);}
.library-app .homework-shell .homework-preview pre{font-family:"IBM Plex Sans",system-ui,sans-serif;font-size:.9375rem;}
.library-app .homework-shell .homework .meta{font-family:inherit;font-size:.75rem;line-height:1.4;}
.library-app .homework-shell #homework-compose button{padding:8px 22px;}
.library-app .homework-shell .homework-tabs{border:1px solid var(--line);border-radius:14px;padding:4px;gap:4px;background:white;}
.library-app .homework-shell .homework-tabs button{border:0;border-radius:10px;min-height:44px;}
.library-app .homework-shell .homework-tabs button[aria-pressed=true]{background:var(--brand-soft);color:var(--brand-deep);}
@media(min-width:1101px) and (min-height:650px){
 .library-app .homework-shell #workspace{padding:16px 28px;}
 .library-app .homework-shell .homework-heading{flex-direction:row;}
 .library-app .homework-shell .homework-question-scroll{padding:2px;}
 .library-app .homework-shell .homework-attempt{margin-top:14px;}
}
@media(max-width:1100px){
 .library-app .homework-shell .homework-heading{align-items:flex-start;padding:20px;}
}
@media(max-width:850px){
 .library-app .homework-shell .homework-toolbar label{flex-direction:column;align-items:flex-start;gap:6px;}
 .library-app .homework-shell .homework-toolbar select{width:210px;}
 .library-app .homework-shell :is(.homework-question-pane,.homework-help-pane){padding:18px;}
}
.homework{--hw-green:#234f39;--hw-line:#d9dfd6;color:var(--ink);max-width:1600px;margin:auto}
.homework-heading{display:flex;justify-content:space-between;gap:20px;align-items:flex-start;margin-bottom:24px}
.homework h1,.homework h2{font-family:'Source Serif 4',Georgia,serif;letter-spacing:-.025em}.homework h1{font-size:clamp(2rem,3vw,3rem);margin:0 0 8px}.homework h2{font-size:1.5rem;margin:0 0 16px}
.homework-heading p{margin:0;color:var(--ink-soft)}.homework-actions{display:flex;gap:10px;flex-wrap:wrap}
.homework .button{border:1px solid #aebdaf;background:#fff;color:var(--hw-green);border-radius:7px;cursor:pointer}.homework .button[data-primary=true]{background:var(--hw-green);border-color:var(--hw-green);color:#fff}.homework .button:disabled{opacity:.5;cursor:wait}
.library-app .homework .button[data-primary=true]:hover:not(:disabled){background:#193e2b;color:#fff;border-color:#193e2b}
.homework .field{background:#fff;border-color:#cbd3c9;min-width:0}.homework textarea{width:100%;resize:vertical;line-height:1.6;min-height:90px;max-height:320px}.homework .field-label{font-size:.85rem}
.homework-toolbar{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:14px}.homework-toolbar label{display:flex;align-items:center;gap:10px;min-width:0}.homework-toolbar select{width:250px;max-width:100%}.homework-save-state,.homework .meta{font-size:.75rem;color:var(--ink-soft)}
.homework-status{font-size:.85rem;color:var(--hw-green);line-height:1.5;margin-bottom:12px}.homework-status:empty{display:none}.homework-status button{margin-left:8px}
.homework-layout{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);background:#fdfdfa;border:1px solid var(--hw-line);border-radius:10px;overflow:hidden}
.homework-question-pane{padding:26px;min-width:0}.homework-help-pane{border-left:1px solid var(--hw-line);padding:26px;display:flex;flex-direction:column;min-width:0}
.homework-question-input{min-height:135px!important;font-family:'Source Serif 4',Georgia,serif;font-size:1.05rem!important}.homework-empty{padding:18px 0;color:var(--ink-soft);line-height:1.6}
.homework-files{display:flex;flex-direction:column;gap:8px;margin:12px 0}.homework-file{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:8px 10px;border:1px solid var(--hw-line);background:#f1f4ee;border-radius:6px;font-size:.78rem}.homework-file.selected{border-color:var(--hw-green)}.homework-file>button:first-child{flex:1;text-align:left;border:0;background:transparent;color:var(--hw-green);overflow-wrap:anywhere;min-width:0;cursor:pointer}.homework-file a{color:var(--hw-green)}.homework-file small{flex-basis:100%;color:#765e2b}.homework-file .button{padding:6px}
.homework-preview{margin:16px 0;background:#fff;border:1px solid var(--hw-line);border-radius:6px;overflow:hidden}.homework-preview-head{padding:10px 14px;font-size:.75rem;color:var(--ink-soft);background:#f4f5f0;overflow-wrap:anywhere}.homework-preview-body{min-height:180px}.homework-preview-body>p{padding:16px}.homework-preview iframe{width:100%;height:490px;border:0}.homework-preview img{display:block;max-width:100%;max-height:490px;margin:auto;object-fit:contain}.homework-preview pre{white-space:pre-wrap;overflow-wrap:anywhere;word-break:break-word;font-family:'Source Serif 4',Georgia,serif;line-height:1.8;font-size:1rem;padding:22px;margin:0;min-height:240px;max-height:490px;overflow:auto}
.homework-attempt{margin-top:24px}.homework-attempt .homework-actions{margin-top:10px;justify-content:space-between}.homework-context{margin:0 0 20px;color:var(--ink-soft);font-size:.85rem;overflow-wrap:anywhere}.homework-help-actions{padding-bottom:18px;border-bottom:1px solid var(--hw-line);display:flex;gap:10px;flex-wrap:wrap}.homework-help-actions button{flex:1}
.homework-messages{flex:1;min-height:200px;max-height:580px;overflow:auto;overscroll-behavior:contain;padding:18px 0;line-height:1.65;font-size:.92rem}.homework-turn{margin-bottom:24px}.homework-turn>p{white-space:pre-wrap;overflow-wrap:anywhere;font-size:.8rem;color:var(--ink-soft)}.homework-answer{padding:18px;background:#edf3e9;border-radius:7px;white-space:pre-wrap;overflow-wrap:anywhere;font-family:'Source Serif 4',Georgia,serif;font-size:1rem}.homework-sources{font-size:.7rem;color:var(--ink-soft);border-top:1px solid var(--hw-line);margin-top:12px;padding-top:10px}.homework-sources a{color:inherit;display:block;overflow-wrap:anywhere}.homework-sources ul{padding-left:16px}
#homework-compose{border-top:1px solid var(--hw-line);padding-top:16px;display:grid;gap:8px}#homework-compose button{justify-self:end}#homework-compose .meta{margin:0}.homework-tabs{display:none}.homework button:focus-visible,.homework a:focus-visible,.homework select:focus-visible{outline:2px solid var(--hw-green);outline-offset:3px}
.homework-attempt-actions{margin-top:10px;justify-content:space-between}
@media(min-width:1101px) and (min-height:650px){
 .homework-layout{flex:1;min-height:0;}
 .homework-question-pane,.homework-help-pane{min-height:0;padding:16px 20px;display:flex;flex-direction:column;}
 .homework-question-scroll{flex:1;min-height:0;overflow:auto;overscroll-behavior:contain;padding:4px;}
 /* Empty attachment slots and helper copy must not push the attempt below the fold. */
 .homework-question-scroll .homework-files:empty{display:none;}
 .homework-question-scroll>.homework-empty{padding:0;margin:10px 0;}
 .homework-question-scroll textarea{display:block;}
 .homework-question-scroll:focus-visible{outline:2px solid var(--hw-green);outline-offset:2px;}
 .homework-question-pane>.homework-actions,.homework-question-pane>.meta{flex:none;}
 .homework-question-pane>.meta{margin:6px 0 0;}
 .homework h2{margin-bottom:10px;}
 .homework-context{margin-bottom:10px;}
 .homework-help-actions{flex:none;padding-bottom:10px;}
 .homework-attempt{margin-top:16px;}
 .homework textarea{max-height:150px;}
 .homework .homework-question-input{min-height:90px!important;}
 .homework-preview pre{max-height:none;overflow:visible;}
 .homework-messages{min-height:0;max-height:none;padding:12px 0;}
 #homework-compose{flex:none;padding-top:10px;gap:6px;}
 #homework-compose textarea{min-height:64px;max-height:110px;}
 .homework button,.homework textarea,.homework select,.homework a{scroll-margin-block:8px;}
}
@media(max-width:1150px){.homework-heading{flex-direction:column}.homework-question-pane,.homework-help-pane{padding:18px}}
@media(max-width:850px){.homework-layout{display:block}.homework-tabs{display:flex;border-bottom:1px solid var(--hw-line);margin-bottom:12px}.homework-tabs button{flex:1;padding:12px;border:0;border-bottom:2px solid transparent;background:transparent;color:var(--ink-soft);cursor:pointer}.homework-tabs button[aria-pressed=true]{border-color:var(--hw-green);color:var(--hw-green);font-weight:600}.homework-layout>[data-homework-panel]{display:none}.homework-layout[data-pane=question]>[data-homework-panel=question],.homework-layout[data-pane=help]>[data-homework-panel=help]{display:block}.homework-help-pane{border-left:0}.homework-toolbar{align-items:flex-start}.homework-toolbar label{flex-direction:column;align-items:flex-start}.homework-toolbar select{width:210px}.homework-messages{max-height:520px}.homework-preview iframe{height:450px}}
@media(max-width:980px){.library-app .sidebar-nav:has([data-view=homework]) .nav-group{grid-template-columns:repeat(5,minmax(0,1fr))}.library-app .shell:has([data-view=homework]){padding-bottom:calc(128px + env(safe-area-inset-bottom))}}
@media(max-width:1100px){.homework button,.homework textarea,.homework select,.homework a{scroll-margin-block:120px calc(140px + env(safe-area-inset-bottom));}}
@media(max-width:600px){
 .library-app .sidebar-nav:has([data-view=homework]) .nav-group{grid-template-columns:repeat(6,minmax(0,1fr));}
 .library-app .sidebar-nav:has([data-view=homework]) .nav-item{grid-column:span 2;}
 .library-app .sidebar-nav:has([data-view=homework]) .nav-item:nth-last-child(-n+2){grid-column:span 3;}
}
/* Homework uses the document scroll, not the viewport-locked workspace model.
   Keep these overrides scoped so Portfolio and other screens are unchanged. */
.library-app .homework-shell .app-main,
.library-app .homework-shell #workspace,
.library-app .homework-shell #content,
.library-app .homework-shell .homework{height:auto;max-height:none;min-height:0;flex:none;display:block;overflow:visible;}
.library-app .homework-shell .homework-layout{flex:none;min-height:0;align-items:start;}
.library-app .homework-shell :is(.homework-question-pane,.homework-help-pane,.homework-question-scroll,.homework-messages){height:auto;max-height:none;min-height:0;flex:none;overflow:visible;overscroll-behavior:auto;}
.library-app .homework-shell .homework-tabs{display:none;}
/* Approved library-family presentation; no changes to the shared shell. */
.library-app .homework-shell .homework-heading{min-height:244px;padding:36px;border-radius:18px;border:1px solid #dce7ef;background:#e7f2fc url('./media/homework-header.jpg') center/cover no-repeat;margin-bottom:20px;display:flex;align-items:center;}
.library-app .homework-shell .homework-heading>div{max-width:55%;}
.library-app .homework-shell .homework h1{font-family:'Source Serif 4',Georgia,serif;font-size:clamp(2rem,3.3vw,3.4rem);line-height:1.12;letter-spacing:-.035em;color:var(--brand-deep);margin-bottom:12px;}
.library-app .homework-shell .homework-heading p{font-family:'Source Serif 4',Georgia,serif;font-size:1.2rem;color:var(--brand-deep);line-height:1.5;}
.library-app .homework-shell .homework-toolbar{padding:0;flex-wrap:wrap;margin-bottom:20px;}
.library-app .homework-shell .homework-toolbar .homework-actions{align-items:center;margin-left:auto;}
.library-app .homework-shell .homework-layout{grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:20px;}
.library-app .homework-shell :is(.homework-question-pane,.homework-help-pane){padding:24px;border-radius:16px;border-color:#dce5ef;box-shadow:0 3px 12px #0b234605;}
.library-app .homework-shell .homework h2{font-family:'Source Serif 4',Georgia,serif;font-size:1.7rem;color:var(--brand-deep);line-height:1.25;margin-bottom:16px;}
.library-app .homework-shell .homework .field{border-color:#cdd9e7;border-radius:9px;}
.library-app .homework-shell .homework .homework-question-input{min-height:145px!important;max-height:320px;}
.library-app .homework-shell #homework-attempt{min-height:130px;max-height:320px;}
.library-app .homework-shell .homework-attempt{margin-top:24px;}
.library-app .homework-shell .homework-files:empty{display:none;}
.library-app .homework-shell .homework-question-scroll>.homework-empty{padding:0;margin:10px 0;}
.library-app .homework-shell .homework-attempt h2{font-size:1.4rem;}
.library-app .homework-shell .homework-attempt-actions .button{width:100%;min-height:46px;margin:6px 0 10px;}
.library-app .homework-shell .homework-help-actions{padding:0 0 16px;border:0;border-bottom:1px solid var(--line);border-radius:0;background:transparent;}
.library-app .homework-shell .homework-help-actions .button{background:#edf5fc;min-height:42px;font-size:.875rem;}
.library-app .homework-shell .homework-answer{background:#f0f7fd;border:0;border-radius:12px;padding:20px;font-size:1rem;line-height:1.8;}
.library-app .homework-shell .homework-messages{padding:18px 0;}
.library-app .homework-shell #homework-compose{padding-top:18px;gap:10px;}
.library-app .homework-shell .student-examples{margin-top:24px;}
@media(max-width:850px){
 .library-app .homework-shell .homework-heading{min-height:210px;padding:24px;background-position:60% center;}
 .library-app .homework-shell .homework-heading>div{max-width:60%;}
 .library-app .homework-shell .homework-layout{display:grid;grid-template-columns:minmax(0,1fr);}
 .library-app .homework-shell .homework-layout>[data-homework-panel]{display:block;}
}
@media(max-width:600px){
 .library-app .homework-shell .homework-heading{min-height:240px;padding:22px 20px;background-image:linear-gradient(90deg,#e7f2fcf5 0%,#e7f2fcb8 65%,#e7f2fc40 100%),url('./media/homework-header.jpg');background-position:70% center;}
 .library-app .homework-shell .homework-heading>div{max-width:100%;}
 .library-app .homework-shell .homework h1{font-size:2.1rem;}
 .library-app .homework-shell .homework-heading p{font-size:1.1rem;max-width:260px;}
 .library-app .homework-shell .homework-toolbar{gap:12px;align-items:end;}
 .library-app .homework-shell .homework-toolbar label{flex:1 1 175px;}
 .library-app .homework-shell .homework-toolbar select{width:100%;}
 .library-app .homework-shell :is(.homework-question-pane,.homework-help-pane){padding:20px 16px;}
 .library-app .homework-shell .homework h2{font-size:1.5rem;}
}

/* Homework Help: saved sessions at left, one continuous conversation at right. */
.library-app .homework-shell .homework-session-layout{display:grid;grid-template-columns:minmax(220px,270px) minmax(0,1fr);align-items:start;gap:20px;}
.library-app .homework-shell .homework-sessions,
.library-app .homework-shell .homework-conversation{min-width:0;background:#fff;border:1px solid #dce5ef;border-radius:16px;box-shadow:0 3px 12px #0b234605;}
.library-app .homework-shell .homework-sessions{padding:18px 14px;}
.library-app .homework-shell .homework-sessions-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:0 4px 16px;border-bottom:1px solid var(--line);}
.library-app .homework-shell .homework-sessions-head h2{font-size:1.35rem;margin:4px 0 0;}
.library-app .homework-shell .homework-sessions-head .button{min-height:38px;padding:7px 11px;white-space:nowrap;font-size:.8rem;}
.library-app .homework-shell .homework-eyebrow{display:block;color:var(--ink-soft);font-size:.68rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;}
.library-app .homework-shell .homework-session-list{display:grid;gap:5px;padding-top:12px;}
.library-app .homework-shell .homework-session-item{display:flex;align-items:center;gap:10px;width:100%;min-width:0;min-height:44px;padding:10px;border:1px solid transparent;border-radius:10px;background:transparent;text-align:left;color:var(--ink);cursor:pointer;}
.library-app .homework-shell .homework-session-item:hover:not(:disabled){background:#f3f7fb;}
.library-app .homework-shell .homework-session-item.is-active{background:#edf5fc;border-color:#d6e4f0;color:var(--brand-deep);font-weight:650;}
.library-app .homework-shell .homework-session-item:disabled{opacity:.55;cursor:wait;}
.library-app .homework-shell .homework-session-mark{flex:none;width:8px;height:8px;border-radius:50%;background:#b4c5d5;}
.library-app .homework-shell .homework-session-item.is-active .homework-session-mark{background:var(--brand);}
.library-app .homework-shell .homework-session-title{display:block;flex:1 1 0;min-width:0;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:.875rem;}
.library-app .homework-shell .homework-sessions-empty{margin:14px 6px;color:var(--ink-soft);font-size:.85rem;line-height:1.5;}
.library-app .homework-shell .homework-conversation{padding:22px 26px;}
.library-app .homework-shell .homework-conversation-head{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-bottom:16px;border-bottom:1px solid var(--line);}
.library-app .homework-shell .homework-conversation-head>div{flex:1 1 0;min-width:0;}
.library-app .homework-shell .homework-conversation-head h2{min-width:0;margin:5px 0 0;font-size:1.55rem;overflow-wrap:anywhere;}
.library-app .homework-shell .homework-save-state{flex:none;white-space:nowrap;}
.library-app .homework-shell .homework-problem-details{margin-top:14px;border:1px solid #e2e9f1;border-radius:11px;background:#fafcff;}
.library-app .homework-shell .homework-problem-details>summary{display:flex;gap:10px;align-items:center;padding:11px 14px;cursor:pointer;color:var(--brand-deep);font-size:.86rem;font-weight:650;}
.library-app .homework-shell .homework-problem-details>summary span{color:var(--ink-soft);font-size:.78rem;font-weight:400;}
.library-app .homework-shell .homework-problem-fields{display:grid;grid-template-columns:1fr 1fr;gap:12px;padding:2px 14px 12px;}
.library-app .homework-shell .homework-problem-fields .field-label{display:grid;gap:6px;}
.library-app .homework-shell .homework-problem-fields textarea{min-height:82px;max-height:220px;font-size:.875rem!important;}
.library-app .homework-shell .homework-problem-details>.meta{margin:0;padding:0 14px 12px;}
.library-app .homework-shell .homework-history-files{padding:0 14px 10px;}
.library-app .homework-shell .homework-history-files>.meta{margin:0 0 8px;}
.library-app .homework-shell .homework-messages{display:flex;flex-direction:column;gap:18px;max-height:none;min-height:260px;overflow:visible;padding:22px 0;}
.library-app .homework-shell .homework-session-context{align-self:flex-start;width:min(100%,720px);padding:15px 17px;border:1px solid #e1e9f0;border-radius:12px;background:#f7f9fc;}
.library-app .homework-shell .homework-session-context>span{display:block;margin-bottom:4px;color:var(--ink-soft);font-size:.68rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;}
.library-app .homework-shell .homework-session-context p{margin:0 0 12px;white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.55;}
.library-app .homework-shell .homework-session-context p:last-child{margin-bottom:0;}
.library-app .homework-shell .homework-turn{display:grid;gap:12px;margin:0;}
.library-app .homework-shell .homework-student-message{align-self:flex-end;width:min(90%,680px);padding:12px 15px;border-radius:13px 13px 3px 13px;background:#edf5fc;}
.library-app .homework-shell .homework-student-message>span,.library-app .homework-shell .homework-ai-label{display:block;margin-bottom:5px;color:var(--brand-deep);font-size:.68rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase;}
.library-app .homework-shell .homework-student-message p{margin:0;white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.55;}
.library-app .homework-shell .homework-answer{align-self:flex-start;width:min(100%,760px);padding:16px 18px;border:1px solid #e1e9f0;border-radius:13px 13px 13px 3px;background:#f7f9fc;line-height:1.7;}
.library-app .homework-shell #homework-compose{grid-template-columns:minmax(0,1fr) 46px;align-items:end;gap:8px;border-top:1px solid var(--line);padding-top:14px;}
.library-app .homework-shell #homework-compose textarea{min-height:50px;max-height:180px;resize:vertical;border-radius:12px;padding:12px 14px;}
.library-app .homework-shell #homework-compose button{width:46px;height:46px;padding:0;border-radius:12px;font-size:1.25rem;}
.library-app .homework-shell #homework-compose .meta{grid-column:1/-1;margin:0;}
.library-app .homework-shell .homework-conversation-empty{padding:20px 18px;border:1px dashed #cbd8e4;border-radius:12px;background:#fbfcfe;}
.library-app .homework-shell .homework-conversation-empty h3{margin:8px 0 5px;color:var(--brand-deep);font-family:'Source Serif 4',Georgia,serif;font-size:1.2rem;}
.library-app .homework-shell .homework-conversation-empty p{max-width:620px;margin:0;color:var(--ink-soft);line-height:1.6;}
.library-app .homework-shell .homework-empty-mark{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:9px;background:#edf5fc;color:var(--brand);font-size:1.1rem;}
.library-app .homework-shell .homework-start{max-width:760px;margin:0 auto;padding:8px 0;}
.library-app .homework-shell .homework-start h2{margin:7px 0 8px;font-size:1.75rem;}
.library-app .homework-shell .homework-start>p{max-width:600px;color:var(--ink-soft);line-height:1.6;}
.library-app .homework-shell .homework-start form{display:grid;gap:16px;margin-top:22px;}
.library-app .homework-shell .homework-start .field-label{display:grid;gap:7px;}
.library-app .homework-shell .homework-start .field-label>span{color:var(--ink-soft);font-weight:400;}
.library-app .homework-shell .homework-start textarea{min-height:110px;max-height:280px;}
.library-app .homework-shell .homework-start button{justify-self:start;min-height:46px;padding:10px 18px;}
@media(max-width:850px){
 .library-app .homework-shell .homework-session-layout{grid-template-columns:minmax(0,1fr);gap:14px;}
 .library-app .homework-shell .homework-sessions{padding:14px;}
 .library-app .homework-shell .homework-session-list{grid-template-columns:repeat(auto-fit,minmax(170px,1fr));}
 .library-app .homework-shell .homework-conversation{padding:20px 18px;}
}
@media(max-width:600px){
 .library-app .homework-shell .homework-sessions-head{align-items:flex-end;}
 .library-app .homework-shell .homework-session-list{grid-template-columns:minmax(0,1fr);max-height:none;overflow:visible;}
 .library-app .homework-shell .homework-conversation-head{align-items:flex-start;}
 .library-app .homework-shell .homework-problem-fields{grid-template-columns:minmax(0,1fr);}
 .library-app .homework-shell .homework-conversation{padding:17px 14px;}
 .library-app .homework-shell .homework-student-message{width:96%;}
 .library-app .homework-shell .homework-heading{min-height:180px;}
}