:root{--bg: #ffffff;--surface: #ffffff;--surface-2: #f1f5f9;--border: #e2e8f0;--border-strong: #cbd5e1;--text: #1e293b;--muted: #64748b;--primary: #1d4ed8;--primary-d: #1e40af;--primary-soft: #dbeafe;--accent: #1d4ed8;--accent-soft: #dbeafe;--danger: #dc2626;--success: #16a34a;--radius: 14px;--radius-sm: 9px;--shadow: 0 1px 2px rgba(15, 23, 42, .05), 0 6px 20px rgba(15, 23, 42, .06);--shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);--sans: "Inter", -apple-system, system-ui, Segoe UI, Roboto, sans-serif;--serif: "Inter", -apple-system, system-ui, sans-serif}*{box-sizing:border-box}html,body{margin:0}body{font-family:var(--sans);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;line-height:1.5}.app{min-height:100vh}.container{max-width:860px;margin:0 auto;padding:28px 18px 80px}.center{text-align:center;padding:56px 0}.muted{color:var(--muted)}.error{color:var(--danger)}.success{color:var(--success)}a{color:var(--primary);text-underline-offset:2px}h1,h2,h3,h4{font-family:var(--sans);font-weight:700;color:var(--text);letter-spacing:-.02em}h1{font-size:28px;margin:6px 0}h2{font-size:22px;margin:0 0 12px}h3{font-size:18px;margin:0 0 10px}h4{font-size:15px;margin:0 0 8px}.page-sub{color:var(--muted);margin:0 0 24px;font-size:15px}.nav{display:flex;align-items:center;gap:22px;padding:0 22px;height:60px;background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:20}.nav .brand{display:flex;align-items:center;gap:9px;font-family:var(--serif);font-weight:700;font-size:18px;color:var(--text);text-decoration:none}.nav .logo{width:28px;height:28px;border-radius:9px;background:linear-gradient(135deg,#1d4ed8,#3b82f6);display:grid;place-items:center;color:#fff;font-size:15px}.nav-links{display:flex;gap:6px}.nav-links a{color:var(--muted);text-decoration:none;font-size:14px;font-weight:500;padding:7px 11px;border-radius:8px}.nav-links a:hover{color:var(--text);background:var(--surface-2)}.nav-links a.active{color:var(--primary);background:var(--primary-soft)}.nav .spacer{flex:1}.user-chip{display:flex;align-items:center;gap:9px;font-size:14px}.avatar{width:30px;height:30px;border-radius:50%;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center;font-weight:700;font-size:13px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px;margin-bottom:18px;box-shadow:var(--shadow-sm)}.card.flush{padding:0;overflow:hidden}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px}label{display:block;margin-bottom:14px;font-size:13px;font-weight:600;color:var(--text)}input,textarea,select{width:100%;margin-top:5px;padding:10px 12px;border:1px solid var(--border-strong);border-radius:var(--radius-sm);font:inherit;font-weight:400;color:var(--text);background:#fff;transition:border-color .15s,box-shadow .15s}input:focus,textarea:focus,select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-soft)}textarea{min-height:84px;resize:vertical}.checkbox,.checkbox input{width:auto;display:inline-flex;align-items:center;gap:9px;margin-top:0}fieldset{border:none;border-top:1px solid var(--border);border-radius:0;margin:0;padding:20px 0 8px;background:none}fieldset:first-of-type{border-top:none;padding-top:4px}legend{display:block;float:none;width:100%;padding:0;margin-bottom:10px;font-size:15px;font-weight:700;color:var(--text);letter-spacing:-.01em}button{cursor:pointer;padding:10px 16px;border-radius:var(--radius-sm);border:1px solid var(--border-strong);background:#fff;font:inherit;font-weight:600;font-size:14px;color:var(--text);transition:background .15s,border-color .15s,transform .05s}button:hover{background:var(--surface-2)}button:active{transform:translateY(1px)}button.primary{background:var(--primary);color:#fff;border-color:var(--primary)}button.primary:hover{background:var(--primary-d);border-color:var(--primary-d)}button.link{border:none;background:none;color:var(--primary);padding:6px 8px}button.link:hover{background:var(--primary-soft)}button.link.danger{color:var(--danger)}button.link.danger:hover{background:#f7e2dd}button:disabled{opacity:.55;cursor:default}button.ghost{background:transparent;border-color:var(--border-strong)}.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.row-between{display:flex;justify-content:space-between;align-items:center;gap:12px}.badge{display:inline-block;padding:2px 10px;font-size:12px;font-weight:600;border-radius:20px;background:var(--accent-soft);color:var(--accent)}.badge.teal{background:var(--primary-soft);color:var(--primary-d)}.badge.muted{background:var(--surface-2);color:var(--muted)}.tabs{display:flex;gap:4px;margin-bottom:22px;border-bottom:1px solid var(--border)}.tabs button{border:none;background:none;border-radius:0;color:var(--muted);padding:10px 14px;border-bottom:2px solid transparent;margin-bottom:-1px}.tabs button:hover{background:none;color:var(--text)}.tabs button.active{color:var(--primary);border-bottom-color:var(--primary)}.stepper{display:flex;gap:8px;overflow-x:auto;padding:4px 2px 14px}.step{flex:0 0 auto;min-width:54px;height:38px;padding:0 14px;border-radius:20px;border:1px solid var(--border-strong);background:#fff;color:var(--muted);font-weight:600;font-size:13px;display:grid;place-items:center;cursor:pointer;transition:all .15s}.step:hover{border-color:var(--primary);color:var(--primary)}.step.active{background:var(--primary);border-color:var(--primary);color:#fff}.step.done{background:var(--primary-soft);border-color:var(--primary-soft);color:var(--primary-d)}.step.done.active{background:var(--primary);color:#fff}.step-event{border-style:dashed}dl.outline{display:grid;grid-template-columns:130px 1fr;gap:10px 16px;margin:0}dl.outline dt{font-weight:600;color:var(--muted);font-size:13px}dl.outline dd{margin:0}.hw-list{margin:0 0 8px;padding-left:18px}.hw-list li{margin-bottom:12px}.hw-desc{color:var(--muted);margin-top:2px}.hw-links{margin-top:4px}.hw-links a{margin-right:14px;font-size:14px}.month-info{margin-bottom:16px}.month-info p{margin:3px 0}.avail-grid{width:100%;border-collapse:separate;border-spacing:0;margin-bottom:18px}.avail-grid th,.avail-grid td{border-bottom:1px solid var(--border);padding:9px;text-align:center;text-transform:capitalize;font-size:14px}.avail-grid th{color:var(--muted);font-weight:600}.avail-grid td.day{text-align:left;font-weight:600}.blackouts{list-style:none;padding:0}.blackouts li{padding:5px 0}.homework{margin-top:18px;border-top:1px solid var(--border);padding-top:14px}.homework-item{background:var(--surface-2);border-radius:var(--radius-sm);padding:12px;margin-bottom:10px}.topic-form{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px;margin:10px 0}.topic-card{border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:8px;background:#fff}.topic-card.drag-over{border-color:var(--primary);box-shadow:0 0 0 2px var(--primary-soft)}.topic-card.dragging{opacity:.5}.topic-head{display:flex;align-items:center;gap:8px;padding:10px 12px}.drag-handle{cursor:grab;color:var(--muted);-webkit-user-select:none;user-select:none;font-size:15px}.drag-handle:active{cursor:grabbing}.topic-toggle{flex:1;text-align:left;border:none;background:none;padding:2px 0;font-weight:600;font-size:15px;color:var(--text)}.topic-toggle:hover{background:none}.chev{display:inline-block;width:14px;color:var(--muted)}.topic-meta{display:flex;gap:6px;font-size:13px}.topic-body{padding:0 12px 14px 34px}.topic-links{padding:0 12px 12px 34px;margin-top:-2px}.kebab{position:relative}.kebab-btn{font-size:18px;line-height:1;padding:2px 8px}.kebab-menu{position:absolute;right:0;top:28px;z-index:30;background:#fff;border:1px solid var(--border);border-radius:9px;box-shadow:var(--shadow);padding:5px;min-width:130px;display:flex;flex-direction:column}.kebab-menu button{border:none;background:none;text-align:left;padding:8px 12px;border-radius:6px;font-weight:500}.kebab-menu button:hover{background:var(--surface-2)}.kebab-menu button.danger{color:var(--danger)}.kebab-menu button:disabled{opacity:.4}.gp-mine{background:var(--primary-soft);border-radius:7px;padding-left:10px!important}.gp-note{background:var(--primary-soft);color:var(--primary-d);border-radius:var(--radius-sm);padding:10px 14px;margin:16px 0;font-size:14px}.bookends{background:var(--surface-2)}.bookends p{margin:4px 0}.comments{margin-top:14px;border-top:1px dashed var(--border);padding-top:12px}.comment{background:var(--surface-2);border-radius:var(--radius-sm);padding:10px 12px;margin-bottom:8px}.comment p{margin:4px 0 0}.comment .muted{font-size:12px}.hw-comments{margin-top:10px;border-top:1px dashed var(--border);padding-top:10px}.hw-comments textarea{min-height:48px}.preview-banner{background:var(--primary-soft);color:var(--primary-d);border:1px solid #bfdbfe;border-radius:var(--radius-sm);padding:11px 14px;margin-bottom:18px;font-size:14px}.links-editor{margin-bottom:4px}.link-row{margin-bottom:6px}.link-row input{margin-top:0}.announcement{background:var(--surface-2);border-radius:var(--radius-sm);padding:12px 14px;margin-bottom:10px}.announcement.callout{background:#fef9e7;border:1px solid #f6e7b0}.sub-row{border-top:1px solid var(--border);padding:12px 0}.sub-row:first-of-type{border-top:none}.seg{display:inline-flex;gap:4px;background:var(--surface-2);padding:4px;border-radius:10px;margin-bottom:20px}.seg button{border:none;background:none;border-radius:7px;padding:7px 16px;color:var(--muted);font-weight:600}.seg button:hover{background:none;color:var(--text)}.seg button.active{background:#fff;color:var(--text);box-shadow:var(--shadow-sm)}.submit-section{border-top:1px solid var(--border);padding:18px 0 8px}.submit-section:first-of-type{border-top:none;padding-top:4px}.submit-section .hw-list{margin-top:4px}.member-list{list-style:none;padding:0;margin:0}.member-list li{padding:11px 0;border-top:1px solid var(--border)}.member-list li:first-child{border-top:none}.slots .slot{padding:11px 0;border-top:1px solid var(--border)}.meetings{padding-left:18px}.meetings li{margin-bottom:5px}.meetings li.conflict{color:var(--danger)}.auth-shell{min-height:100vh;display:grid;place-items:center;background:radial-gradient(900px 480px at 50% -10%,#eff4ff,#f1f5f9 60%);padding:20px}.auth-card{width:100%;max-width:400px}.auth-card .logo-lg{width:52px;height:52px;border-radius:15px;background:linear-gradient(135deg,#1d4ed8,#3b82f6);display:grid;place-items:center;color:#fff;font-size:26px;margin:0 auto 14px}.bare-page{min-height:100vh;padding:36px 18px;background:radial-gradient(900px 480px at 50% -10%,#eff4ff,#f1f5f9 60%)}.poll{max-width:600px;margin:0 auto}@media (max-width: 640px){.container{padding:18px 14px 64px}h1{font-size:24px}h2{font-size:20px}.nav{height:auto;min-height:56px;padding:10px 14px;flex-wrap:wrap;gap:10px 14px}.nav .brand{font-size:16px}.nav-links{order:3;width:100%;overflow-x:auto;gap:4px;-webkit-overflow-scrolling:touch}.nav-links a{white-space:nowrap}.uname{display:none}.tabs{overflow-x:auto;-webkit-overflow-scrolling:touch}.tabs button{white-space:nowrap}.row{gap:8px}.topic-row{flex-direction:column;gap:6px}.topic-actions{align-self:flex-start}dl.outline{grid-template-columns:1fr;gap:2px 0}dl.outline dt{margin-top:8px}.seg{width:100%}.seg button{flex:1}}