:root{font-family:SF Pro Text,SF Pro Display,Helvetica Neue,sans-serif;color:#111827;background:linear-gradient(180deg,#f2f2f7,#eceef4);line-height:1.5;font-weight:400;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;color-scheme:light;--safe-top: env(safe-area-inset-top, 0px);--safe-right: env(safe-area-inset-right, 0px);--safe-bottom: env(safe-area-inset-bottom, 0px);--safe-left: env(safe-area-inset-left, 0px);--surface: rgba(255, 255, 255, .9);--surface-border: rgba(15, 23, 42, .06);--surface-shadow: 0 20px 44px rgba(15, 23, 42, .08);--line: #e5e7eb;--soft-text: #6b7280;--ios-blue: #0a84ff;--ios-blue-soft: #eaf3ff;--incoming-bubble: #e9eaee}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;min-height:100dvh}button,textarea{font:inherit}button{border:0;cursor:pointer}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}#root{min-height:100vh;min-height:100dvh}.app-shell{display:grid;grid-template-columns:330px minmax(0,1fr);gap:20px;min-height:100vh;min-height:100dvh;padding:max(18px,calc(10px + var(--safe-top))) max(18px,calc(12px + var(--safe-right))) max(18px,calc(12px + var(--safe-bottom))) max(18px,calc(12px + var(--safe-left)))}.sidebar,.conversation-panel{-webkit-backdrop-filter:blur(24px);backdrop-filter:blur(24px);background:var(--surface);border:1px solid var(--surface-border);border-radius:28px;box-shadow:var(--surface-shadow)}.sidebar{display:flex;flex-direction:column;padding:18px 16px}.sidebar-header{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:18px;padding:6px 4px 10px}.sidebar-eyebrow{margin:0 0 4px;color:#8a94a6;font-size:.8rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase}.sidebar-header h1{margin:0;font-size:clamp(2rem,3vw,2.5rem);line-height:1}.compose-icon{display:grid;place-items:center;width:42px;height:42px;border-radius:50%;background:#f3f4f6;color:#111827;font-size:1.6rem;line-height:1}.chat-list{display:flex;flex-direction:column;gap:10px}.chat-card{display:grid;grid-template-columns:52px minmax(0,1fr);gap:12px;align-items:center;width:100%;padding:12px;text-align:left;background:transparent;border:1px solid transparent;border-radius:20px;transition:background-color .18s ease,border-color .18s ease,transform .18s ease}.chat-card:hover,.chat-card.active{background:#f7f8fa;border-color:#0f172a0f;transform:translateY(-1px)}.chat-card.active{background:var(--ios-blue-soft);border-color:#0a84ff1a}.chat-avatar{display:grid;place-items:center;width:52px;height:52px;border-radius:50%;color:#0f172a;font-size:1.1rem;font-weight:700;box-shadow:inset 0 0 0 1px #ffffffb3}.chat-card-content,.chat-card-topline{display:flex;flex-direction:column;min-width:0}.chat-card-topline{flex-direction:row;justify-content:space-between;gap:12px;margin-bottom:2px}.chat-card-topline strong,.chat-preview,.message-bubble p{overflow:hidden;text-overflow:ellipsis}.chat-card-topline strong{font-size:1rem}.chat-card-topline small,.chat-status,.chat-preview{color:var(--soft-text)}.conversation-panel{display:grid;grid-template-rows:auto 1fr auto;min-height:calc(100vh - 36px);padding:18px 18px 14px}.conversation-header{display:flex;justify-content:space-between;gap:16px;align-items:center;margin-bottom:12px;padding:4px 4px 14px;border-bottom:1px solid var(--line)}.conversation-identity{display:flex;align-items:center;gap:12px;min-width:0}.header-avatar{flex-shrink:0}.panel-kicker{display:inline-flex;align-items:center;margin:0 0 2px;color:#8a94a6;font-size:.76rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase}.conversation-header h2{margin:0;font-size:1.35rem;line-height:1.1}.conversation-header span,.conversation-meta small{color:var(--soft-text)}.conversation-meta{display:flex;flex-direction:column;align-items:flex-end;gap:6px}.build-pill{display:inline-flex;align-items:center;padding:6px 10px;border-radius:999px;background:#f4f5f7;color:#667085;font-size:.76rem;font-weight:700}.message-list{display:flex;flex-direction:column;gap:12px;padding:8px 4px 18px;overflow:auto}.message-bubble{max-width:min(74%,560px);padding:12px 14px;border-radius:20px 20px 20px 8px;background:var(--incoming-bubble)}.message-bubble.own{align-self:flex-end;border-radius:20px 20px 8px;background:var(--ios-blue);color:#fff}.message-author{display:block;margin-bottom:4px;color:#5f6b7a;font-size:.76rem;font-weight:700;letter-spacing:.03em}.message-bubble.own .message-author,.message-bubble.own small{color:#ffffffc2}.message-bubble p{margin:0 0 6px}.composer{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px;align-items:end;padding-top:12px;padding-bottom:max(0px,calc(var(--safe-bottom) - 4px));border-top:1px solid var(--line)}.composer-field{display:flex}.composer textarea{width:100%;min-height:48px;max-height:180px;padding:14px 18px;resize:vertical;border:1px solid #dde1e7;border-radius:24px;background:#fff;outline:none}.composer textarea:focus{border-color:#0a84ff59;box-shadow:0 0 0 4px #0a84ff1a}.send-button{display:grid;place-items:center;width:48px;height:48px;border-radius:50%;background:var(--ios-blue);color:#fff;font-size:1.3rem;font-weight:700;box-shadow:0 12px 24px #0a84ff38}.send-button:hover{transform:translateY(-1px)}@media (max-width: 960px){.app-shell{grid-template-columns:1fr}.conversation-panel{min-height:auto}}@media (max-width: 640px){.app-shell{gap:14px;padding:max(12px,calc(8px + var(--safe-top))) max(12px,calc(8px + var(--safe-right))) max(14px,calc(10px + var(--safe-bottom))) max(12px,calc(8px + var(--safe-left)))}.sidebar,.conversation-panel{border-radius:24px;padding:14px}.conversation-header{align-items:flex-start;flex-direction:column}.conversation-meta{align-items:flex-start}.message-bubble{max-width:88%}}