:root{--bg:#f3f6fa;--panel:#fff;--text:#102033;--muted:#64748b;--line:#dbe3ec;--accent:#2563eb;--accent2:#0f5bd8;--green:#168454;--amber:#b45309;--red:#b42318;--shadow:0 10px 30px rgba(15,32,51,.06)}
*{box-sizing:border-box}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text);line-height:1.45}.shell{max-width:1440px;margin:0 auto;padding:22px 24px 56px}.topbar{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:18px}.brand{display:flex;align-items:center;gap:12px}.brand h1{font-size:20px;margin:0}.brand p{margin:2px 0 0;color:var(--muted);font-size:13px}.mark{width:40px;height:40px;border-radius:8px;display:grid;place-items:center;background:#0f172a;color:#fff;font-weight:800}.top-actions,.banner-actions,.actions,.modal-actions{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.pill,.badge{display:inline-flex;align-items:center;padding:6px 9px;border:1px solid var(--line);border-radius:999px;background:#f8fafc;color:#475569;font-size:11px;font-weight:800;letter-spacing:.04em;text-transform:uppercase}.pill.success,.badge.accent{background:#eef6ff;border-color:#bfdbfe;color:#1d4ed8}.badge.warning{background:#fff7ed;border-color:#fed7aa;color:var(--amber)}.banner{display:flex;justify-content:space-between;gap:18px;align-items:center;padding:16px 18px;background:#0f172a;color:#fff;border-radius:8px;margin-bottom:0;box-shadow:var(--shadow)}.banner strong{display:block;font-size:15px}.banner span{display:block;color:#cbd5e1;font-size:12px;margin-top:2px}.proof-strip{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-top:0;background:#fff;margin-bottom:18px}.proof-strip div{padding:11px 16px;border-right:1px solid var(--line);display:flex;align-items:baseline;gap:7px}.proof-strip div:last-child{border-right:0}.proof-strip strong{font-size:15px}.proof-strip span{color:var(--muted);font-size:11px}.columns{display:grid;grid-template-columns:1.35fr .95fr;gap:18px;margin-bottom:18px;align-items:start}.columns.lower{grid-template-columns:1.15fr .85fr}.card{background:var(--panel);border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow);overflow:hidden}.card-head{padding:18px 20px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:14px;align-items:flex-start}.card-head h2{margin:2px 0 3px;font-size:18px}.card-head p{margin:0;color:var(--muted);font-size:12px}.card-body{padding:18px 20px}.eyebrow{font-size:10px;letter-spacing:.12em;font-weight:900;color:#64748b}.offer-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;padding:18px 20px}.offer-box{border:1px solid var(--line);border-radius:8px;padding:14px}.offer-box.mine{background:#f7fbff;border-color:#bfdbfe}.offer-box.vendor{background:#fffaf5;border-color:#fed7aa}.offer-title{font-size:11px;font-weight:900;text-transform:uppercase;letter-spacing:.08em;color:#475569;margin-bottom:10px}.offer-rows{display:grid;grid-template-columns:1fr 1fr;gap:7px}.offer-rows div{display:flex;justify-content:space-between;gap:8px;font-size:12px}.offer-rows span{color:var(--muted)}.offer-rows strong{font-weight:750;text-align:right}.diff-box{margin:0 20px 20px;padding:14px;border:1px solid #fde68a;background:#fffbeb;border-radius:8px}.diff-box>div{display:flex;justify-content:space-between;gap:10px;align-items:center}.diff-box p{font-size:13px;margin:8px 0;color:#3f3a2f}.diff-box small{color:#7c6f50}.constraint-list{display:grid;gap:10px}.constraint{display:flex;justify-content:space-between;gap:12px;align-items:center;padding:11px 12px;border:1px solid var(--line);border-radius:8px}.constraint strong{display:block;font-size:13px}.constraint span{display:block;color:var(--muted);font-size:12px;margin-top:1px}.add-row{display:flex;gap:8px;margin-top:14px}.input{width:100%;min-width:0;padding:10px 12px;border:1px solid #cbd5e1;border-radius:6px;background:#fff;color:var(--text);outline:none}.input:focus{border-color:#93c5fd;box-shadow:0 0 0 3px rgba(37,99,235,.1)}.btn{border:1px solid #cbd5e1;background:#fff;color:#1f2937;border-radius:6px;padding:9px 12px;font-weight:750;font-size:12px;cursor:pointer}.btn:hover{background:#f8fafc}.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn.primary:hover{background:var(--accent2)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn.ghost{background:transparent}.icon-btn{background:transparent;border:0;color:#2563eb;font-size:11px;font-weight:800;cursor:pointer}.constraint-footer{display:flex;justify-content:space-between;gap:10px;color:#64748b;font-size:11px;margin-top:12px}.hint{font-style:italic}.proposal-summary{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:9px;margin-bottom:14px}.score{padding:10px;border:1px solid var(--line);border-radius:8px;background:#f8fafc}.score span{display:block;color:#64748b;font-size:10px;text-transform:uppercase;letter-spacing:.06em;overflow-wrap:anywhere}.score strong{font-size:18px;display:block;margin-top:3px}.proposal-package{padding:14px;border:1px solid #bfdbfe;background:#f8fbff;border-radius:8px}.rationale{margin-top:12px;padding:12px;background:#f8fafc;border-radius:8px}.rationale strong{font-size:12px}.rationale p{margin:4px 0 0;color:#475569;font-size:12px}.approval-note{margin-top:10px;padding:9px 11px;border-radius:8px;background:#ecfdf3;color:#166534;font-size:11px;font-weight:750}.empty{padding:24px 8px;color:#64748b;text-align:center}.empty strong{color:#1f2937}.empty p{font-size:12px;margin:5px auto 0;max-width:420px}.scenario-list{display:grid;gap:10px}.scenario{border:1px solid var(--line);border-radius:8px;padding:12px}.scenario.infeasible{border-color:#fecaca;background:#fff7f7}.scenario-head{display:flex;justify-content:space-between;gap:10px;align-items:center}.scenario-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:10px 0}.scenario-grid span{padding:8px;border-radius:6px;background:#f8fafc;font-weight:750;font-size:12px}.scenario p{margin:7px 0 0;color:#64748b;font-size:11px}.timeline{max-height:430px;overflow:auto}.event{display:grid;grid-template-columns:10px 1fr;gap:10px;margin-bottom:14px}.node{width:8px;height:8px;border-radius:50%;margin-top:6px;background:#94a3b8}.node.human{background:#2563eb}.node.agent{background:#7c3aed}.node.vendor{background:#d97706}.node.tool{background:#0f766e}.node.system{background:#64748b}.event-meta{font-size:10px;color:#94a3b8;text-transform:uppercase;letter-spacing:.05em}.event-text{font-size:12px;margin-top:2px}.reasoning{display:grid;gap:10px}.reasoning p{margin:0;padding:11px;border:1px solid var(--line);border-radius:8px;background:#f8fafc;font-size:12px}.overlay{position:fixed;inset:0;background:rgba(15,23,42,.55);display:grid;place-items:center;padding:20px;z-index:20}.overlay.hidden{display:none}.modal{width:min(560px,100%);background:#fff;border-radius:8px;padding:22px;box-shadow:0 28px 80px rgba(0,0,0,.22)}.modal h2{margin:5px 0 7px}.modal>p{color:#64748b;font-size:12px}.modal-summary{border:1px solid var(--line);border-radius:8px;padding:14px;margin:14px 0}.toast{position:fixed;right:22px;bottom:22px;background:#0f172a;color:#fff;padding:11px 14px;border-radius:8px;font-size:12px;z-index:30;box-shadow:0 12px 30px rgba(0,0,0,.2)}
@media (max-width:980px){.columns,.columns.lower{grid-template-columns:1fr}.offer-grid{grid-template-columns:1fr}.proposal-summary{grid-template-columns:repeat(2,minmax(0,1fr))}.topbar,.banner{align-items:flex-start;flex-direction:column}.proof-strip{grid-template-columns:1fr 1fr}.proof-strip div:nth-child(2){border-right:0}.proof-strip div:nth-child(-n+2){border-bottom:1px solid var(--line)}}
button:focus-visible,.icon-btn:focus-visible{outline:3px solid #93c5fd;outline-offset:2px}

.constraints-card .card-head{padding:14px 16px}.constraints-card .card-body{padding:14px 16px}.constraints-card .constraint-list{gap:7px}.constraints-card .constraint{padding:8px 10px}.constraints-card .add-row{margin-top:10px}.add-row .btn{white-space:nowrap}.constraints-card .constraint-footer{margin-top:8px}

.scenario-option{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-top:8px;padding:10px;border:1px solid var(--line);border-radius:10px;background:#fbfdff}.scenario-option span{display:block;color:var(--muted);font-size:11px;margin-top:2px}.scenario-score{font-weight:800;color:var(--text)!important}.sr-only{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}

.toast.confirm{flex-direction:column;align-items:stretch;gap:8px;max-width:440px}.toast-actions{display:flex;gap:8px;justify-content:flex-end}.toast .btn{padding:6px 14px;font-size:13px}.toast-text{font-weight:600}

@media (max-width:640px){.shell{padding:14px 12px 40px}.top-actions{align-items:flex-start}.card-head,.card-body,.offer-grid{padding-left:14px;padding-right:14px}.diff-box{margin-left:14px;margin-right:14px}.proof-strip{grid-template-columns:1fr 1fr}.proof-strip div:nth-child(2){border-right:0}.proof-strip div:nth-child(-n+2){border-bottom:1px solid var(--line)}.banner-actions{width:100%}.banner-actions .btn{flex:1 1 auto}.offer-rows{grid-template-columns:1fr}.add-row{flex-direction:column}.add-row .btn{width:100%}.constraint-footer{flex-direction:column}.proposal-summary{grid-template-columns:1fr 1fr}.proposal-summary .score:last-child{grid-column:1/-1}.scenario-option{align-items:flex-start;flex-direction:column}.toast{left:12px;right:12px;bottom:12px}}