:root{--bg: #0f172a;--panel: #111827;--border: #1f2937;--text: #e5e7eb;--muted: #9ca3af;--brand: #60a5fa;--accent: #34d399}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text)}.app-shell{display:flex;height:100%}.app-main{flex:1;display:flex;flex-direction:column}.app-main.full{margin-left:0}.app-header{display:flex;align-items:center;gap:12px;padding:12px 16px;border-bottom:1px solid var(--border);background:var(--panel);position:sticky;top:0;z-index:2}.app-header h1{font-size:16px;font-weight:600;margin:0}.app-content{padding:16px;height:calc(100% - 52px);overflow:auto}button{background:var(--brand);color:#fff;border:0;padding:8px 12px;border-radius:8px;cursor:pointer;font-weight:600}button:disabled{opacity:.6;cursor:not-allowed}button.ghost{background:transparent;color:var(--text);border:1px solid var(--border)}button.secondary{background:#334155}.sidebar{width:240px;background:#0b1220;border-right:1px solid var(--border);display:flex;flex-direction:column;overflow:hidden;transition:width .25s ease,transform .25s ease}.sidebar.closed{width:0;min-width:0;transform:translate(-100%);border-right:0}.sidebar .sidebar-top{display:flex;align-items:center;gap:8px;padding:12px;border-bottom:1px solid var(--border)}.sidebar .brand{font-weight:700;color:var(--brand)}.sidebar nav{display:flex;flex-direction:column;padding:8px;gap:6px}.nav-item{text-align:left;background:transparent;border:1px solid var(--border);color:var(--text);padding:10px 12px;border-radius:8px}.nav-item.active{border-color:var(--brand);background:#0f1a2d}.sidebar .sidebar-bottom{margin-top:auto;padding:12px;border-top:1px solid var(--border)}.signin-page{height:100%;display:grid;place-items:center;padding:16px}.signin-card{background:var(--panel);border:1px solid var(--border);padding:24px;border-radius:12px;width:100%;max-width:360px;display:grid;gap:12px}.signin-card h2{margin:0 0 8px}.signin-card label{display:grid;gap:6px;font-size:14px;color:var(--muted)}.signin-card input{padding:10px 12px;border-radius:8px;border:1px solid var(--border);background:#0b1220;color:var(--text)}.signin-card .error{color:#fca5a5;font-size:14px}.signin-card .hint{color:var(--muted);font-size:12px}.password-input{position:relative}.password-input input{padding-right:38px}.toggle-password{position:absolute;right:8px;top:50%;transform:translateY(-50%);background:transparent;border:0;padding:4px;color:var(--muted);cursor:pointer;border-radius:6px}.toggle-password:hover{color:var(--text);background:#ffffff0a}.toggle-password:focus{outline:2px solid var(--brand);outline-offset:2px}.toggle-password svg{display:block;width:18px;height:18px}.search-bar{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;background:var(--panel);border:1px solid var(--border);padding:12px;border-radius:12px;margin-bottom:16px}.field{display:grid;gap:6px}.field label{font-size:13px;color:var(--muted)}.field input,.field select{padding:10px 12px;border-radius:8px;border:1px solid var(--border);background:#0b1220;color:var(--text)}.results{display:grid;grid-template-columns:1fr;gap:12px}.muted{color:var(--muted)}.teacher-card{display:grid;grid-template-columns:clamp(170px,25vw,230px) 1fr;gap:12px;background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:12px}.teacher-card{align-items:start}.teacher-card .avatar{width:100%;height:auto;max-width:230px;min-width:170px;border-radius:12px;border:1px solid var(--border);background:#0b1220;object-fit:contain}.teacher-card .info{display:grid;gap:6px;align-content:start}.teacher-card .name{font-weight:800;font-size:16px}.teacher-card .meta{display:flex;gap:8px;align-items:center;color:var(--muted);font-size:12px}.teacher-card .pill{padding:2px 8px;border-radius:999px;background:#0b1220;border:1px solid var(--border)}.teacher-card .pill.subtle{opacity:.9}.teacher-card .dot{opacity:.5}.teacher-card .desc{margin:0;color:#d1d5db;font-size:14px;line-height:1.35;white-space:pre-line}.multi-select{position:relative}.multi-select-trigger{display:flex;align-items:center;justify-content:space-between;width:100%;background:#0b1220;color:var(--text);border:1px solid var(--border);padding:10px 12px;border-radius:8px;cursor:pointer}.multi-select-trigger .placeholder{color:var(--muted)}.multi-select-trigger .placeholder.has-selection{color:var(--text)}.multi-select-trigger .chevron{margin-left:8px;opacity:.7}.multi-select-menu{position:absolute;top:calc(100% + 6px);left:0;right:0;background:var(--panel);border:1px solid var(--border);border-radius:8px;padding:8px;display:grid;gap:6px;z-index:10;max-height:240px;overflow:auto}.multi-select-menu .option{display:flex;align-items:center;gap:8px;font-size:14px}.multi-select-menu .divider{height:1px;background:var(--border);margin:4px 0}