:root{color-scheme:light;--bg: #f7f7f8;--sidebar-bg: #ececf1;--surface: #ffffff;--surface-muted: #f4f4f5;--surface-strong: #e7e7eb;--ink: #1f1f23;--ink-soft: #667085;--ink-faint: #8a8f98;--accent: #10a37f;--accent-strong: #0f8a6c;--line: rgba(15, 23, 42, .08);--line-strong: rgba(15, 23, 42, .14);--danger: #b42318;--shadow-sm: 0 1px 3px rgba(15, 23, 42, .08);--shadow-lg: 0 20px 40px rgba(15, 23, 42, .08);font-family:IBM Plex Sans,Segoe UI,sans-serif}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;min-height:100vh;background:var(--bg);color:var(--ink)}button,input,select,textarea{font:inherit}button{transition:background-color .18s ease,border-color .18s ease,color .18s ease,box-shadow .18s ease,transform .18s ease}button:hover:not(:disabled){transform:translateY(-1px)}.screen{min-height:100vh}.centered{display:grid;place-items:center;background:var(--bg)}.auth-screen{min-height:100vh;display:grid;grid-template-columns:minmax(0,1.1fr) minmax(360px,.9fr);gap:24px;padding:24px;background:linear-gradient(180deg,#f9f9fb,#f3f4f6)}.hero-panel,.login-card{background:#ffffffeb;border:1px solid var(--line);box-shadow:var(--shadow-lg)}.hero-panel{border-radius:32px;padding:48px;display:flex;flex-direction:column;justify-content:center}.hero-panel h1{margin:8px 0 18px;font-size:clamp(2.4rem,6vw,4.8rem);line-height:.95;letter-spacing:-.04em}.hero-panel p{max-width:56ch;margin:0;color:var(--ink-soft);font-size:1.05rem;line-height:1.7}.hero-credit{margin-top:18px!important;font-size:.92rem!important}.hero-credit a,.login-credit a{color:var(--accent-strong);text-decoration:none}.hero-credit a:hover,.login-credit a:hover{text-decoration:underline}.eyebrow{color:var(--accent-strong);text-transform:uppercase;letter-spacing:.12em;font-size:.73rem;font-weight:700}.login-card{border-radius:28px;padding:32px;display:grid;gap:16px;align-content:center}.login-card h2{margin:0 0 8px;font-size:1.5rem}.login-credit{margin:4px 0 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#fffc}.brand,.chat-header,.toolbar,.composer-actions,.sidebar-footer{display:flex;align-items:center;justify-content:space-between;gap:12px}.brand{align-items:flex-start}.brand h2{margin:4px 0 0;font-size:1.15rem;letter-spacing:-.02em}.sidebar-meta{margin:6px 0 0;color:var(--ink-soft);font-size:.86rem;line-height:1.45}.sidebar-cta{width:100%;justify-content:center;border-radius:18px}.sidebar-section{min-height:0;display:grid;gap:8px}.sidebar-label{padding:0 6px;color:var(--ink-faint);font-size:.73rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase}.conversation-list{min-height:0;display:grid;gap:6px;overflow:auto;align-content:start;padding-right:2px}.conversation-item{width:100%;border:1px solid transparent;background:transparent;color:var(--ink);border-radius:14px;padding:10px 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span{color:var(--ink-soft);font-size:.82rem}.chat-shell{--composer-offset: 196px;min-height:0;height:100%;display:grid;grid-template-rows:auto minmax(0,1fr) auto;gap:8px;padding:10px;border:1px solid rgba(255,255,255,.72);border-radius:28px;background:radial-gradient(circle at top,#ffffffe6,#ffffff9e 38%,#f7f7f8f5);box-shadow:var(--shadow-lg);overflow:hidden}.chat-shell.chat-header-collapsed{gap:0}.chat-header{position:relative;z-index:2;min-height:56px;max-height:120px;padding:8px 12px;border:1px solid var(--line);border-radius:18px;background:#ffffffd1;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 1px 2px #0f172a0d;overflow:hidden;transform-origin:top;transition:min-height .18s ease,padding .18s ease,opacity .18s ease,transform .18s ease,margin .18s ease,border-color .18s ease,box-shadow .18s 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textarea:focus{background:#fff;border-color:#10a37f6b;box-shadow:0 0 0 4px #10a37f1f,0 10px 24px #10a37f14}.composer-actions{padding-top:8px;border-top:1px solid var(--line)}.composer-tools{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.primary-button,.ghost-button,.upload-button,.link-button,.login-card button{border:none;cursor:pointer}.primary-button,.login-card button{padding:11px 16px;border-radius:999px;background:var(--ink);color:#fff;box-shadow:var(--shadow-sm)}.primary-button:hover:not(:disabled),.login-card button:hover{background:#111318}.primary-button:disabled{opacity:.55;cursor:not-allowed;transform:none}.ghost-button,.upload-button{padding:10px 14px;border-radius:999px;background:#ffffffc7;color:var(--ink);border:1px solid var(--line);box-shadow:var(--shadow-sm)}.ghost-button:disabled{opacity:.5;cursor:not-allowed;transform:none}.link-button{padding:0;background:transparent;color:var(--ink-faint);font-size:.86rem}.link-button:hover{color:var(--ink)}.upload-button input{display:none}.error{width:min(100%,880px);margin:8px auto 0;padding:10px 12px;border:1px solid rgba(180,35,24,.18);border-radius:16px;background:#b4231814;color:var(--danger)}@media(max-width:1100px){.workspace{grid-template-columns:250px minmax(0,1fr)}.starter-grid{grid-template-columns:1fr}}@media(max-width:980px){.auth-screen,.workspace{grid-template-columns:1fr}.workspace{grid-template-rows:minmax(0,auto) minmax(0,1fr)}.sidebar,.chat-shell{min-height:0}.sidebar{height:auto;max-height:min(34vh,320px);grid-template-rows:auto auto auto auto}.chat-header{position:relative}.message.user{max-width:100%}}@media(max-width:720px){.auth-screen,.workspace{padding:12px;gap:12px}.hero-panel,.login-card,.sidebar{border-radius:24px}.hero-panel,.login-card{padding:24px}.chat-header,.composer{border-radius:22px}.chat-shell{padding:10px;border-radius:24px}.empty-state{padding:24px 20px}.toolbar select{min-width:0}.composer-actions{align-items:stretch;flex-direction:column}.composer-tools,.composer-actions .primary-button{width:100%}.upload-button,.composer-actions .primary-button,.ghost-button{justify-content:center}.file-pill-name{max-width:160px}}