/* NitoCAD Studio: chat workspace. Tokens match the landing page; dark mode comes from theme.css. */
:root{
  --ink:#1C1C1E;--ink-soft:#5E5E63;--orange:#1C1C1E;--dot:#E8601C;--orange-deep:#0E0E10;--gold:#C9A24B;
  --paper:#FAFAF8;--fog:#F0F0EE;--line:#E3E3E0;--surface:#FFFFFF;--deep:#050505;
  --botchain-bright:#13A57D;--botchain-bright-deep:#0E7D5F;
  --side-w:272px;--canvas-w:min(46vw,560px);
  --safe-b:env(safe-area-inset-bottom,0px);--safe-t:env(safe-area-inset-top,0px);
}
*{box-sizing:border-box;}
html,body{height:100%;}
body{margin:0;background:var(--paper);color:var(--ink);font-family:'IBM Plex Sans',sans-serif;-webkit-font-smoothing:antialiased;overflow:hidden;}
h1,h2,h3{font-family:'Fraunces',serif;font-weight:500;margin:0;color:var(--ink);}
a{color:inherit;}
button{font:inherit;color:inherit;}
.mono{font-family:'IBM Plex Mono',monospace;}
[hidden]{display:none !important;}
.theme-toggle.floating{display:none !important;}
:focus-visible{outline:2px solid var(--orange-deep);outline-offset:2px;}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 20px;border-radius:999px;border:1px solid transparent;font-weight:600;font-size:.92rem;cursor:pointer;text-decoration:none;transition:transform .15s ease,background .15s ease,border-color .15s ease;}
.btn-primary{background:var(--orange);color:#fff;}
.btn-primary:hover{background:var(--orange-deep);transform:translateY(-1px);}
.btn-primary:disabled{opacity:.5;cursor:not-allowed;transform:none;}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--ink);}
.btn-ghost:hover{background:var(--ink);color:var(--paper);}
.btn-ghost:disabled{opacity:.5;cursor:not-allowed;}
.btn-sm{padding:8px 14px;font-size:.82rem;}
.icon{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex:none;}
.icon-btn{width:38px;height:38px;border-radius:50%;border:1px solid var(--line);background:transparent;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;padding:0;color:var(--ink);flex:none;}
.icon-btn:hover{border-color:var(--orange);color:var(--orange-deep);}
.logo-icon{height:28px;width:auto;display:block;}
html[data-theme="dark"] .logo-icon{filter:invert(1) hue-rotate(180deg) brightness(1.15);}
.brand{display:flex;align-items:center;gap:8px;text-decoration:none;font-family:'Fraunces',serif;font-style:italic;font-weight:600;font-size:1.25rem;}
.brand span{color:var(--dot);}
.chain-dot{display:inline-flex;align-items:center;gap:6px;border:1px solid rgba(19,165,125,.35);background:rgba(19,165,125,.08);color:var(--botchain-bright-deep);border-radius:999px;padding:3px 10px;font-size:.66rem;letter-spacing:.06em;text-transform:uppercase;font-family:'IBM Plex Mono',monospace;}
html[data-theme="dark"] .chain-dot{color:#3FD6A8;}

/* ---------- gate ---------- */
.gate{min-height:100dvh;display:flex;flex-direction:column;overflow:auto;background:
  radial-gradient(900px 500px at 85% -10%,rgba(120,120,125,.10),transparent 60%),
  radial-gradient(800px 500px at -10% 110%,rgba(19,165,125,.10),transparent 60%),var(--paper);}
.gate-top{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;padding-top:calc(16px + var(--safe-t));}
.gate-body{flex:1;display:flex;align-items:center;justify-content:center;padding:24px 20px 48px;}
.gate-card{width:min(440px,100%);background:var(--surface);border:1px solid var(--line);border-radius:22px;padding:30px 26px;box-shadow:0 30px 70px -40px rgba(40,40,40,.45);}
.gate-card .eyebrow{font-family:'IBM Plex Mono',monospace;font-size:.7rem;letter-spacing:.16em;text-transform:uppercase;color:var(--orange-deep);font-weight:600;}
.gate-card h1{font-size:1.9rem;margin:10px 0 10px;line-height:1.15;}
.gate-card p{color:var(--ink-soft);line-height:1.55;margin:0 0 20px;font-size:.95rem;}
.gate-actions{display:grid;gap:10px;}
.gate-actions .btn{width:100%;padding:13px 20px;}
.btn-google{background:#fff;color:#2B2B2B;border-color:#DDDDDD;}
.btn-google:hover{background:#f7f7f7;}
.gate-note{margin-top:16px;font-size:.78rem;color:var(--ink-soft);text-align:center;}
.gate-err{margin-top:12px;color:var(--orange-deep);font-size:.85rem;min-height:1.2em;text-align:center;}
.gate-list{list-style:none;padding:0;margin:0 0 22px;display:grid;gap:10px;}
.gate-list li{display:flex;gap:10px;font-size:.88rem;color:var(--ink-soft);line-height:1.45;}
.gate-list svg{margin-top:2px;color:var(--botchain-bright);}

/* ---------- app shell ---------- */
.app{height:100dvh;display:grid;grid-template-columns:var(--side-w) minmax(0,1fr);position:relative;}
.app.canvas-open{grid-template-columns:var(--side-w) minmax(0,1fr) var(--canvas-w);}
.scrim{position:fixed;inset:0;background:rgba(22,22,22,.5);z-index:40;opacity:0;pointer-events:none;transition:opacity .2s ease;}
.scrim.on{opacity:1;pointer-events:auto;}

/* sidebar */
.side{background:var(--fog);border-right:1px solid var(--line);display:flex;flex-direction:column;min-height:0;z-index:50;}
html[data-theme="dark"] .side{background:#050505;}
.side-head{padding:14px 14px 8px;padding-top:calc(14px + var(--safe-t));display:flex;align-items:center;justify-content:space-between;gap:8px;}
.new-chat{margin:6px 14px 10px;display:flex;align-items:center;gap:10px;justify-content:flex-start;width:calc(100% - 28px);padding:11px 14px;border-radius:12px;border:1px solid var(--line);background:var(--surface);cursor:pointer;font-weight:600;font-size:.9rem;}
.new-chat:hover{border-color:var(--orange);}
.new-chat .icon{color:var(--orange-deep);}
.chat-list{flex:1;overflow:auto;padding:4px 8px 12px;min-height:0;}
.chat-group{font-family:'IBM Plex Mono',monospace;font-size:.64rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-soft);padding:12px 10px 6px;}
.chat-item{display:flex;align-items:center;gap:6px;border-radius:10px;padding:0 4px 0 0;}
.chat-item:hover{background:rgba(40,40,40,.06);}
html[data-theme="dark"] .chat-item:hover{background:rgba(255,255,255,.05);}
.chat-item.active{background:var(--surface);box-shadow:inset 0 0 0 1px var(--line);}
.chat-open{flex:1;min-width:0;text-align:left;background:none;border:0;padding:10px 10px;cursor:pointer;font-size:.88rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.chat-del{opacity:0;width:28px;height:28px;border-radius:8px;border:0;background:none;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;color:var(--ink-soft);}
.chat-item:hover .chat-del,.chat-del:focus-visible{opacity:1;}
.chat-del:hover{color:var(--orange-deep);}
@media (hover:none){.chat-del{opacity:.7;}}
.chat-empty{padding:14px 12px;color:var(--ink-soft);font-size:.84rem;line-height:1.5;}
.side-foot{border-top:1px solid var(--line);padding:12px 12px calc(12px + var(--safe-b));display:grid;gap:10px;}
.acct{display:flex;align-items:center;gap:10px;min-width:0;}
.avatar{width:34px;height:34px;border-radius:50%;background:var(--ink);color:var(--paper);display:inline-flex;align-items:center;justify-content:center;font-weight:600;font-size:.85rem;flex:none;text-transform:uppercase;}
html[data-theme="dark"] .avatar{background:#262626;color:#fff;}
.acct-meta{min-width:0;flex:1;}
.acct-name{font-size:.86rem;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.acct-sub{font-size:.72rem;color:var(--ink-soft);font-family:'IBM Plex Mono',monospace;}
.foot-row{display:flex;gap:8px;align-items:center;}
.foot-row .btn{flex:1;}
.link-quiet{font-size:.78rem;color:var(--ink-soft);text-decoration:none;}
.link-quiet:hover{color:var(--orange-deep);text-decoration:underline;}

/* main */
.main{display:flex;flex-direction:column;min-width:0;min-height:0;position:relative;}
.top{display:flex;align-items:center;gap:10px;padding:10px 16px;padding-top:calc(10px + var(--safe-t));border-bottom:1px solid var(--line);background:color-mix(in srgb,var(--paper) 90%,transparent);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);z-index:5;}
.top h2{font-family:'IBM Plex Sans',sans-serif;font-size:.95rem;font-weight:600;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.menu-btn{display:none;}
.credit-chip{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:6px 12px 6px 12px;cursor:pointer;font-size:.8rem;font-weight:600;}
.credit-chip:hover{border-color:var(--orange);}
.credit-chip .dot{width:8px;height:8px;border-radius:50%;background:var(--botchain-bright);}
.credit-chip.low .dot{background:var(--orange);}
.canvas-btn{display:none;}

.thread{flex:1;overflow-y:auto;overscroll-behavior:contain;scroll-behavior:smooth;}
.thread-inner{width:min(780px,100%);margin:0 auto;padding:22px 18px 28px;display:flex;flex-direction:column;gap:22px;}

/* empty state */
.hello{padding:7vh 0 0;text-align:center;}
.hello .mark{width:54px;height:54px;margin:0 auto 14px;border-radius:16px;background:var(--surface);border:1px solid var(--line);display:flex;align-items:center;justify-content:center;}
.hello .mark img{height:30px;}
html[data-theme="dark"] .hello .mark img{filter:invert(1) hue-rotate(180deg) brightness(1.15);}
.hello h1{font-size:clamp(1.7rem,4.4vw,2.4rem);line-height:1.15;}
.hello p{color:var(--ink-soft);max-width:48ch;margin:12px auto 0;line-height:1.55;font-size:.96rem;}
.starters{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:28px;text-align:left;}
.starter{border:1px solid var(--line);background:var(--surface);border-radius:14px;padding:14px 15px;cursor:pointer;text-align:left;transition:border-color .15s ease,transform .15s ease;}
.starter:hover{border-color:var(--orange);transform:translateY(-1px);}
.starter b{display:block;font-size:.9rem;margin-bottom:4px;}
.starter span{display:block;color:var(--ink-soft);font-size:.8rem;line-height:1.45;}

/* messages */
.msg{display:flex;gap:12px;align-items:flex-start;}
.msg.user{justify-content:flex-end;}
.bubble{max-width:min(620px,88%);background:var(--ink);color:#fff;border-radius:18px 18px 4px 18px;padding:11px 15px;line-height:1.5;font-size:.95rem;white-space:pre-wrap;word-wrap:break-word;}
html[data-theme="dark"] .bubble{background:#1A1A1A;}
.ava{width:30px;height:30px;border-radius:9px;background:var(--surface);border:1px solid var(--line);display:flex;align-items:center;justify-content:center;flex:none;margin-top:2px;}
.ava img{height:18px;}
html[data-theme="dark"] .ava img{filter:invert(1) hue-rotate(180deg) brightness(1.15);}
.reply{min-width:0;flex:1;font-size:.96rem;line-height:1.62;}
.reply p{margin:0 0 10px;}
.reply p:last-child{margin-bottom:0;}
.reply code{font-family:'IBM Plex Mono',monospace;font-size:.84em;background:var(--fog);border-radius:5px;padding:1px 5px;}
html[data-theme="dark"] .reply code{background:#141414;}
.reply .err{color:var(--orange-deep);}
.thinking{display:flex;align-items:center;gap:5px;height:24px;padding:2px 0;}
.thinking .dot{width:8px;height:8px;border-radius:50%;background:var(--ink-soft);opacity:.35;animation:thinkDot 1.2s ease-in-out infinite;}
.thinking .dot:nth-child(2){animation-delay:.18s;}
.thinking .dot:nth-child(3){animation-delay:.36s;}
.think-note{color:var(--ink-soft);font-size:.82rem;margin-top:6px;}
@keyframes thinkDot{0%,60%,100%{opacity:.35;transform:translateY(0);}30%{opacity:1;transform:translateY(-4px);}}
@media (prefers-reduced-motion:reduce){.thinking .dot{animation:thinkFade 1.4s ease-in-out infinite;}@keyframes thinkFade{0%,100%{opacity:.3;}50%{opacity:1;}}}
@keyframes spin{to{transform:rotate(360deg);}}

/* part card */
.part{margin-top:12px;border:1px solid var(--line);background:var(--surface);border-radius:16px;overflow:hidden;max-width:560px;}
.part-top{display:flex;gap:14px;padding:14px;align-items:center;cursor:pointer;width:100%;text-align:left;background:none;border:0;}
.part-top:hover .part-open{color:var(--orange-deep);}
.part-thumb{width:84px;height:68px;border-radius:10px;background:#F0F0EE;flex:none;display:flex;align-items:center;justify-content:center;overflow:hidden;}
.part-thumb svg{width:100%;height:100%;}
.part-meta{min-width:0;flex:1;}
.part-title{font-weight:600;font-size:.96rem;display:flex;align-items:center;gap:8px;flex-wrap:wrap;}
.ver{font-family:'IBM Plex Mono',monospace;font-size:.64rem;border:1px solid var(--line);border-radius:999px;padding:1px 8px;color:var(--ink-soft);}
.ver.anchored{border-color:rgba(19,165,125,.5);color:var(--botchain-bright-deep);}
html[data-theme="dark"] .ver.anchored{color:#3FD6A8;}
.part-specs{margin-top:6px;display:flex;flex-wrap:wrap;gap:6px;}
.spec-chip{font-family:'IBM Plex Mono',monospace;font-size:.68rem;background:var(--fog);border-radius:6px;padding:2px 7px;color:var(--ink-soft);}
html[data-theme="dark"] .spec-chip{background:#141414;}
.part-open{display:inline-flex;align-items:center;gap:4px;font-size:.76rem;font-weight:600;color:var(--ink-soft);flex:none;}
.part-actions{display:flex;gap:8px;flex-wrap:wrap;padding:0 14px 14px;}
.chip{border:1px solid var(--line);background:transparent;border-radius:999px;padding:7px 12px;font-size:.8rem;cursor:pointer;}
.chip:hover{border-color:var(--orange);color:var(--orange-deep);}
.followups{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px;}
.need-credits{margin-top:12px;border:1px solid rgba(120,120,125,.4);background:rgba(120,120,125,.07);border-radius:14px;padding:14px;max-width:520px;}
.need-credits b{display:block;margin-bottom:4px;}
.need-credits p{margin:0 0 10px;color:var(--ink-soft);font-size:.88rem;}

/* composer */
.composer-wrap{padding:0 14px calc(12px + var(--safe-b));background:linear-gradient(to top,var(--paper) 70%,transparent);}
.composer{width:min(780px,100%);margin:0 auto;border:1px solid var(--line);background:var(--surface);border-radius:20px;padding:10px 10px 10px 16px;display:flex;align-items:flex-end;gap:10px;box-shadow:0 12px 40px -26px rgba(40,40,40,.5);transition:border-color .15s ease;}
.composer:focus-within{border-color:var(--orange);}
.composer textarea{flex:1;border:0;outline:0;background:transparent;resize:none;font:inherit;font-size:.98rem;line-height:1.5;color:var(--ink);padding:7px 0;max-height:180px;min-height:28px;}
.composer textarea::placeholder{color:#9E9E9E;}
.send{width:40px;height:40px;border-radius:50%;border:0;background:var(--orange);color:#fff;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;flex:none;}
.send:disabled{background:var(--line);color:#9E9E9E;cursor:not-allowed;}
.send .icon{stroke-width:2.2;}
.fineprint{width:min(780px,100%);margin:8px auto 0;text-align:center;color:var(--ink-soft);font-size:.72rem;line-height:1.4;}

/* canvas */
.canvas{display:none;flex-direction:column;background:var(--surface);border-left:1px solid var(--line);min-height:0;min-width:0;z-index:30;}
.app.canvas-open .canvas{display:flex;}
.cv-head{display:flex;align-items:center;gap:10px;padding:10px 14px;padding-top:calc(10px + var(--safe-t));border-bottom:1px solid var(--line);}
.cv-head h3{font-family:'IBM Plex Sans',sans-serif;font-size:.95rem;font-weight:600;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.cv-head select{border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:6px 10px;font-size:.78rem;font-family:'IBM Plex Mono',monospace;color:var(--ink);}
.cv-stage{position:relative;height:min(46vh,420px);background:#F0F0EE;flex:none;overflow:hidden;}
.cv-stage canvas{display:block;}
.cv-tools{position:absolute;right:10px;top:10px;display:flex;flex-direction:column;gap:8px;}
.cv-tools .icon-btn{background:rgba(255,255,255,.9);border-color:#DEDEDE;color:#1C1C1E;width:36px;height:36px;}
.cv-tools .icon-btn[aria-pressed="true"]{border-color:var(--orange);color:var(--orange-deep);}
.cv-empty{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:#5E5E63;font-size:.85rem;text-align:center;padding:24px;}
.cv-load{position:absolute;inset:0;display:flex;flex-direction:column;gap:10px;align-items:center;justify-content:center;color:#5E5E63;font-family:'IBM Plex Mono',monospace;font-size:.78rem;background:rgba(240,240,240,.85);}
.cv-load i{width:24px;height:24px;border-radius:50%;border:2px solid #D9D9D9;border-top-color:var(--dot);animation:spin .8s linear infinite;}
.cv-dim{position:absolute;left:12px;bottom:10px;font-family:'IBM Plex Mono',monospace;font-size:.68rem;color:#5E5E63;background:rgba(255,255,255,.85);padding:3px 8px;border-radius:6px;}
.tabs{display:flex;gap:4px;padding:10px 12px 0;border-bottom:1px solid var(--line);}
.tab{border:0;background:none;padding:9px 12px;font-size:.86rem;font-weight:600;color:var(--ink-soft);cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-1px;}
.tab[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--orange);}
.panel{flex:1;overflow:auto;padding:14px;min-height:0;}
.kv{display:grid;gap:0;border:1px solid var(--line);border-radius:12px;overflow:hidden;}
.kv .row{display:flex;justify-content:space-between;gap:14px;padding:9px 12px;font-size:.84rem;border-top:1px solid var(--line);}
.kv .row:first-child{border-top:0;}
.kv .row span:first-child{color:var(--ink-soft);font-family:'IBM Plex Mono',monospace;font-size:.76rem;}
.kv .row span:last-child{font-weight:600;text-align:right;word-break:break-word;}
.note{margin-top:12px;border:1px solid rgba(201,162,75,.5);background:rgba(201,162,75,.1);border-radius:12px;padding:10px 12px;font-size:.82rem;line-height:1.5;}
.note ul{margin:6px 0 0;padding-left:18px;}
.files{display:grid;gap:8px;}
.file{display:flex;align-items:center;gap:12px;border:1px solid var(--line);border-radius:12px;padding:10px 12px;}
.file .ext{font-family:'IBM Plex Mono',monospace;font-size:.72rem;font-weight:600;background:var(--ink);color:var(--paper);border-radius:6px;padding:4px 7px;min-width:50px;text-align:center;}
html[data-theme="dark"] .file .ext{background:#262626;color:#fff;}
.file .what{flex:1;min-width:0;}
.file .what b{display:block;font-size:.86rem;}
.file .what span{display:block;font-size:.75rem;color:var(--ink-soft);}
.chain{border:1px solid rgba(19,165,125,.4);background:rgba(19,165,125,.07);border-radius:14px;padding:14px;}
.chain .kick{font-family:'IBM Plex Mono',monospace;font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;opacity:.8;}
.chain b{display:block;margin-top:4px;}
.chain ul{margin:10px 0 12px 18px;padding:0;font-size:.84rem;line-height:1.55;}
.chain .tx{font-family:'IBM Plex Mono',monospace;font-size:.78rem;word-break:break-all;margin:8px 0 12px;}
.chain .fine{font-size:.76rem;opacity:.75;margin-bottom:10px;}

/* modal + toast */
.modal{position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;padding:16px;background:rgba(22,22,22,.6);backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px);}
.modal-card{width:min(480px,100%);background:var(--paper);border:1px solid var(--line);border-radius:20px;padding:22px;max-height:92dvh;overflow:auto;}
html[data-theme="dark"] .modal-card{background:var(--surface);}
.modal-card h3{font-size:1.35rem;margin-bottom:6px;}
.modal-card > p{margin:0 0 16px;color:var(--ink-soft);font-size:.9rem;line-height:1.5;}
.tier{display:flex;align-items:center;justify-content:space-between;gap:12px;border:1px solid var(--line);background:var(--surface);border-radius:14px;padding:14px;margin-bottom:10px;}
.tier b{display:block;}
.tier span{font-size:.8rem;color:var(--ink-soft);}
.modal-foot{display:flex;justify-content:flex-end;margin-top:6px;}
.toast{position:fixed;left:50%;bottom:calc(92px + var(--safe-b));transform:translateX(-50%) translateY(10px);background:#1C1C1C;color:#fff;padding:10px 16px;border-radius:12px;font-size:.84rem;z-index:120;opacity:0;pointer-events:none;transition:opacity .2s ease,transform .2s ease;max-width:min(92vw,460px);text-align:center;}
.toast.on{opacity:1;transform:translateX(-50%);}

/* ---------- responsive ---------- */
@media (max-width:1180px){
  .app.canvas-open{grid-template-columns:var(--side-w) minmax(0,1fr);}
  .canvas{z-index:45;position:fixed;top:0;right:0;bottom:0;width:min(560px,100%);box-shadow:-30px 0 70px -30px rgba(0,0,0,.45);}
  .canvas-btn{display:inline-flex;}
}
@media (max-width:900px){
  .app,.app.canvas-open{grid-template-columns:minmax(0,1fr);}
  .side{position:fixed;top:0;bottom:0;left:0;width:min(86vw,320px);transform:translateX(-102%);transition:transform .22s ease;}
  .side.open{transform:none;box-shadow:30px 0 70px -30px rgba(0,0,0,.5);}
  .menu-btn{display:inline-flex;}
}
@media (max-width:640px){
  .canvas{width:100%;}
  .cv-stage{height:44vh;}
  .starters{grid-template-columns:1fr;}
  .thread-inner{padding:16px 14px 22px;}
  .top{padding-left:12px;padding-right:12px;}
  .credit-chip .lbl{display:none;}
}
@media (prefers-reduced-motion:reduce){*{animation-duration:.01ms !important;transition-duration:.01ms !important;scroll-behavior:auto !important;}}

/* ---------- attached files ---------- */
.attach{width:40px;height:40px;border-radius:50%;border:0;background:transparent;color:var(--ink-soft);display:inline-flex;align-items:center;justify-content:center;cursor:pointer;flex:none;margin-left:-8px;}
.attach:hover{background:var(--fog);color:var(--ink);}
.composer.drag{border-color:var(--orange);background:var(--fog);}
.filecard{border:1px solid var(--line);border-radius:14px;background:var(--surface);padding:14px 16px;margin-top:8px;max-width:620px;}
.filecard .fc-head{display:flex;gap:10px;align-items:baseline;flex-wrap:wrap;}
.filecard .fc-head b{word-break:break-all;}
.filecard .fc-kind{font:600 .7rem 'IBM Plex Mono',monospace;color:var(--orange-deep);border:1px solid var(--line);border-radius:6px;padding:1px 6px;}
.filecard .fc-sub{color:var(--ink-soft);font-size:.85rem;margin:2px 0 8px;}
.filecard dl{display:grid;grid-template-columns:auto 1fr;gap:4px 14px;margin:8px 0;font-size:.9rem;}
.filecard dt{color:var(--ink-soft);} .filecard dd{margin:0;font-family:'IBM Plex Mono',monospace;font-size:.85rem;}
.filecard .fc-h{font:600 .78rem 'IBM Plex Sans',sans-serif;color:var(--ink-soft);margin:10px 0 4px;}
.filecard ul{margin:0;padding-left:18px;font-size:.88rem;}
.filecard .conf{font:600 .65rem 'IBM Plex Mono',monospace;border-radius:999px;padding:1px 7px;margin-left:6px;}
.filecard .conf.high{background:#e2f5ec;color:#13794f;} .filecard .conf.medium{background:#fff3d6;color:#8a5a00;} .filecard .conf.low{background:#fde7e4;color:#a32a1f;}
.filecard .fc-warn{background:#fff6e5;border:1px solid #f0d9a8;border-radius:8px;padding:7px 10px;font-size:.84rem;margin-top:8px;}
.filecard .fc-desc{border-left:3px solid var(--orange);padding:6px 10px;margin:10px 0;font-size:.92rem;background:var(--fog);border-radius:0 8px 8px 0;}
.filecard .fc-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px;}
.filecard details{margin-top:8px;font-size:.85rem;} .filecard pre{white-space:pre-wrap;max-height:160px;overflow:auto;font-size:.78rem;background:var(--fog);padding:8px;border-radius:8px;}
html[data-theme="dark"] .filecard .fc-warn{background:#3a2f12;border-color:#5b4a1c;}
.filecard .fc-trace{display:block;width:100%;max-height:220px;object-fit:contain;background:#fff;border:1px solid #d7dde8;border-radius:8px;margin:8px 0;}
html[data-theme="dark"] .filecard .fc-trace{background:#1b2230;border-color:#2c3648;}

/* preview-then-pay */
.preview-tag{font-size:.75rem;color:var(--muted,#767676);align-self:center;margin-left:4px;}
.file.locked{opacity:.55;}
.file.locked button{cursor:not-allowed;}
.part-actions{display:flex;flex-wrap:wrap;gap:8px;align-items:center;}

/* AI picker and guidance choices */
.ai-bar{width:min(780px,100%);margin:0 auto 8px;display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;font-size:.82rem;color:var(--muted,#767676);}
.eng-pick{position:relative;}
.eng-btn{display:inline-flex;align-items:center;gap:8px;font:inherit;font-weight:600;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:7px 12px 7px 14px;cursor:pointer;transition:border-color .15s,background .15s;}
.eng-btn:hover,.eng-btn[aria-expanded="true"]{border-color:var(--orange);}
.eng-btn .icon{width:14px;height:14px;transition:transform .18s;}
.eng-btn[aria-expanded="true"] .icon{transform:rotate(180deg);}
.eng-menu{position:absolute;left:0;bottom:calc(100% + 8px);z-index:30;min-width:230px;margin:0;padding:6px;list-style:none;background:var(--surface);border:1px solid var(--line);border-radius:16px;box-shadow:0 18px 40px rgba(0,0,0,.35);animation:engIn .14s ease-out;}
.eng-menu[hidden]{display:none;}
@keyframes engIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.eng-menu li{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:10px 12px;border-radius:11px;color:var(--ink);font-weight:600;cursor:pointer;outline:0;}
.eng-menu li small{font-weight:400;font-size:.74rem;color:var(--muted,#8a8a8a);}
.eng-menu li:hover,.eng-menu li:focus{background:rgba(127,127,127,.14);}
.eng-menu li.on{background:rgba(232,96,28,.14);}
.eng-menu li.on span::after{content:"";display:inline-block;width:6px;height:6px;margin-left:8px;border-radius:50%;background:var(--orange);vertical-align:middle;}
.eng-menu li.off{opacity:.45;cursor:not-allowed;}
.side-links{display:flex;flex-wrap:wrap;gap:6px 14px;padding:4px 14px 10px;font-size:.84rem;}
.side-links a{color:var(--ink-soft);text-decoration:none;font-weight:500;}
.side-links a:hover{color:var(--orange);}
.choices{margin-top:12px;display:grid;gap:12px;}
.choice-q p{margin:0 0 6px;font-weight:600;}

/* requirements panel (Specs tab) */
.reqs{margin-top:16px;}
.reqs h4{margin:0 0 8px;font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-soft);font-weight:600;}
.req{display:flex;align-items:flex-start;justify-content:space-between;gap:10px;border:1px solid var(--line);border-left-width:4px;border-radius:10px;padding:8px 10px;margin-bottom:8px;font-size:.84rem;}
.req b{display:block;font-weight:600;}
.req span{display:block;color:var(--ink-soft);font-size:.76rem;margin-top:2px;}
.req.pass{border-left-color:var(--botchain-bright);}
.req.fail{border-left-color:var(--orange);background:rgba(211,84,31,.07);}
.req.unknown{border-left-color:var(--gold);}
.req-x{border:0;background:none;color:var(--ink-soft);font-size:1.1rem;line-height:1;cursor:pointer;padding:2px 6px;}
.req-x:hover{color:var(--orange-deep);}
.req-none{margin:0 0 8px;color:var(--ink-soft);font-size:.82rem;}
.req-add{display:flex;gap:8px;}
.req-add input{flex:1;min-width:0;border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:999px;padding:8px 14px;font:inherit;font-size:.84rem;}
.req-add input:focus{outline:0;border-color:var(--orange);}

/* assembly panel (Specs tab) */
.asm{margin-top:16px;}
.asm h4{margin:14px 0 8px;font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-soft);font-weight:600;}
.asm h4:first-child{margin-top:0;}
.asm-ok{margin:0;padding:8px 10px;border:1px solid rgba(19,165,125,.4);background:rgba(19,165,125,.07);border-radius:10px;font-size:.84rem;}
.asm-find{list-style:none;margin:0;padding:0;display:grid;gap:6px;}
.asm-find li{border:1px solid var(--line);border-left-width:4px;border-radius:10px;padding:7px 10px;font-size:.84rem;}
.asm-find li.bad{border-left-color:var(--orange);background:rgba(211,84,31,.07);}
.asm-find li.warn{border-left-color:var(--gold);}
.asm-fine{margin:8px 0 0;color:var(--ink-soft);font-size:.74rem;}
.asm-scroll{overflow-x:auto;margin-bottom:10px;border:1px solid var(--line);border-radius:12px;}
.asm-table{width:100%;border-collapse:collapse;font-size:.8rem;}
.asm-table th,.asm-table td{padding:7px 9px;text-align:left;border-top:1px solid var(--line);vertical-align:top;}
.asm-table thead th{border-top:0;font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-soft);}
.asm-table td small{display:block;color:var(--ink-soft);font-family:'IBM Plex Mono',monospace;font-size:.68rem;}
/* manufacturability check */
.check-card{margin-top:18px;padding:14px;border:1px solid var(--line);border-radius:14px;background:var(--surface);}
.check-card p{margin:10px 0;line-height:1.5;}
.chip.on{background:var(--ink);color:var(--surface);border-color:var(--ink);}
.report .rhead{font-weight:600;margin:12px 0 6px;}
.chk{display:flex;gap:10px;padding:10px 0;border-top:1px solid var(--line);}
.chk p{margin:2px 0 4px;font-size:.88rem;line-height:1.45;}
.chk small{color:var(--ink-soft);font-size:.78rem;display:block;}
.chk-tag{flex:none;align-self:flex-start;min-width:84px;text-align:center;padding:2px 8px;border-radius:999px;font-size:.72rem;font-weight:600;border:1px solid var(--line);}
.chk-tag.ok{color:#4ADE80;border-color:#4ADE80;}
.chk-tag.warn{color:#FBBF24;border-color:#FBBF24;}
.chk-tag.bad{color:#F87171;border-color:#F87171;}
.chk-tag.nc,.chk-tag.info{color:var(--ink-soft);}
.rnote{font-size:.78rem;color:var(--ink-soft);margin:8px 0 0;}
/* template picker */
.tpl-card{width:min(760px,100%);}
.tpl-card input[type=search]{width:100%;box-sizing:border-box;margin:0 0 10px;padding:9px 12px;border:1px solid var(--line);border-radius:10px;background:var(--surface);color:var(--ink);font:inherit;}
.tpl-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:12px;margin-top:14px;}
.tpl{display:flex;flex-direction:column;gap:8px;padding:12px;border:1px solid var(--line);border-radius:14px;background:var(--surface);}
.tpl .tag{font-size:.7rem;border:1px solid var(--line);border-radius:999px;padding:1px 8px;color:var(--ink-soft);}
/* ---------- navy-black tint and glow ---------- */
html[data-theme="dark"] .gate{
  background:
    radial-gradient(50% 60% at 85% 100%,rgba(84,120,200,.40) 0%,transparent 65%),
    radial-gradient(45% 55% at 100% 70%,rgba(226,105,130,.30) 0%,transparent 66%),
    radial-gradient(50% 60% at 70% 85%,rgba(154,92,170,.38) 0%,transparent 70%),
    #000;
}
html[data-theme="dark"] .gate-card,
html[data-theme="dark"] .composer,
html[data-theme="dark"] .starter,
html[data-theme="dark"] .part,
html[data-theme="dark"] .filecard,
html[data-theme="dark"] .modal-card,
html[data-theme="dark"] .check-card,
html[data-theme="dark"] .tpl,
html[data-theme="dark"] .req,
html[data-theme="dark"] .asm-scroll{
  background-color:#0B0B14;
  border-color:#222234;
}
html[data-theme="dark"] .hello{
  background:radial-gradient(40% 50% at 50% 0%,rgba(126,92,200,.22) 0%,transparent 70%);
}
html[data-theme="dark"] .side{background:#04040C;}
html[data-theme="dark"] .bubble{background:#161624;}

/* what the last edit changed */
.edit-diff{margin-top:10px;border:1px solid var(--line);border-left-width:4px;border-radius:10px;padding:8px 10px;font-size:.82rem;max-width:520px;}
.edit-diff.has-worse{border-left-color:var(--dot);}
.edit-diff-h{font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-soft);font-weight:600;margin-bottom:4px;}
.edit-diff ul{margin:0;padding-left:16px;}
.edit-diff li{margin:2px 0;overflow-wrap:anywhere;}
.edit-diff li.d-worse{color:var(--dot);}
.edit-diff li.d-better{color:var(--botchain-bright-deep);}

/* assembly view (inside the studio) */
.side-asm{display:block;background:none;border:0;padding:0;font:inherit;font-weight:500;color:var(--ink-soft);cursor:pointer;}
.side-asm:hover{color:var(--orange);}
.asm-view{position:absolute;inset:0;z-index:25;display:flex;flex-direction:column;background:var(--paper);}
.asm-view[hidden]{display:none;}
.asm-head{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;padding-top:calc(12px + var(--safe-t));border-bottom:1px solid var(--line);}
.asm-head h3{margin:0;font-size:1.2rem;}
.asm-body{flex:1;overflow-y:auto;padding:16px;width:min(900px,100%);margin:0 auto;}
.asm-lead,.asm-note{color:var(--ink-soft);font-size:.9rem;line-height:1.5;margin:0 0 14px;}
.asm-tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin-bottom:16px;overflow-x:auto;}
.asm-tabs button{background:none;border:0;border-bottom:3px solid transparent;padding:9px 13px;font:600 .88rem inherit;font-family:inherit;color:var(--ink-soft);cursor:pointer;white-space:nowrap;}
.asm-tabs button[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--orange);}
.asm-panel{display:none;}.asm-panel.on{display:block;}
#asmSpec{width:100%;min-height:240px;resize:vertical;box-sizing:border-box;font:400 .78rem/1.5 'IBM Plex Mono',monospace;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:12px;}
.asm-panel input{width:100%;box-sizing:border-box;font:inherit;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:9px 11px;}
.asm-lbl{display:block;font-size:.78rem;font-weight:600;color:var(--ink-soft);margin:10px 0 4px;}
.asm-row{display:flex;gap:10px;flex-wrap:wrap;margin:12px 0;}
.asm-card{border:1px solid var(--line);border-radius:14px;background:var(--surface);padding:14px;margin-top:14px;}
.asm-card h4{margin:0 0 8px;font-size:1rem;}
.asm-card table{width:100%;border-collapse:collapse;font-size:.82rem;}
.asm-card th,.asm-card td{padding:6px 8px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top;}
.asm-card .sc{overflow-x:auto;}
.asm-pill{display:inline-block;padding:1px 9px;border-radius:999px;font-size:.72rem;font-weight:600;border:1px solid var(--line);}
.asm-pill.error{color:#ff8a80;border-color:#ff8a80;}.asm-pill.warning{color:#f0b429;border-color:#f0b429;}.asm-pill.ok{color:#4fd1a5;border-color:#4fd1a5;}
.asm-err{border:1px solid #ff8a80;color:#ff8a80;border-radius:10px;padding:10px 12px;font-size:.88rem;margin-top:12px;}

.side-links{flex-direction:column;align-items:flex-start;gap:2px;}
.side-links .side-h{font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-soft);margin:2px 0 4px;}
.side-links .side-asm{padding:6px 0;}
.tool-frame{flex:1;width:100%;border:0;background:var(--paper);}
.ai-bar{flex-wrap:wrap;}

/* live 3D in the chat */
.part-3d{position:relative;height:clamp(200px,34vh,280px);background:#EDF2F4;overflow:hidden;touch-action:pan-y;}
.part-3d>svg{position:absolute;inset:0;margin:auto;width:92px;height:76px;opacity:.55;}
.part-3d.ready>svg{display:none;}
.p3d-canvas{display:block;width:100%;height:100%;outline:0;cursor:grab;}
.part-3d img{display:block;width:100%;height:100%;object-fit:cover;}
.p3d-hint{position:absolute;left:10px;bottom:8px;right:10px;font-size:.68rem;color:#5b6772;pointer-events:none;opacity:.9;}
.part-3d:not(.live) .p3d-hint,.part-3d.failed .p3d-hint{display:none;}
.p3d-dim{position:absolute;right:10px;top:8px;font:500 .7rem 'IBM Plex Mono',monospace;color:#1C1C1E;background:rgba(255,255,255,.85);border-radius:6px;padding:2px 7px;pointer-events:none;}
.spec-chip.editable{cursor:pointer;border:1px dashed var(--line);}
.spec-chip.editable:hover{border-color:var(--orange);color:var(--ink);}
.chip-input{width:68px;font:inherit;color:var(--ink);background:var(--surface);border:1px solid var(--orange);border-radius:5px;padding:0 4px;}

.part-3d.active{touch-action:none;box-shadow:inset 0 0 0 2px var(--orange);}
.part-3d.live:not(.active) .p3d-canvas{cursor:pointer;}
.p3d-done{display:none;position:absolute;right:10px;bottom:8px;font:600 .75rem inherit;font-family:inherit;color:#fff;background:var(--orange);border:0;border-radius:999px;padding:5px 14px;cursor:pointer;}
.part-3d.active .p3d-done{display:block;}
.part-3d.live .p3d-hint{right:84px;}

.p3d-info{position:absolute;left:10px;top:8px;max-width:calc(100% - 150px);display:flex;flex-direction:column;gap:2px;font-size:.78rem;color:#1C1C1E;background:rgba(255,255,255,.93);border-radius:10px;padding:8px 10px;box-shadow:0 2px 10px rgba(0,0,0,.18);}
.p3d-info[hidden]{display:none;}
.p3d-info b{font-size:.82rem;}
.p3d-info em{font-style:normal;color:#5b6772;font-size:.7rem;margin-top:2px;}
.p3d-info-actions{display:flex;gap:6px;margin-top:6px;align-items:center;}
.p3d-info-actions button{font:600 .72rem inherit;font-family:inherit;border:1px solid #cfd6dc;background:#fff;color:#1C1C1E;border-radius:999px;padding:3px 10px;cursor:pointer;}
.p3d-info-actions button[data-p3d=resize],.p3d-info-actions button[data-p3d=apply]{background:var(--orange);border-color:var(--orange);color:#fff;}
.p3d-info-actions input{width:64px;font:inherit;border:1px solid var(--orange);border-radius:6px;padding:2px 5px;}

.p3d-info{pointer-events:none;}
.p3d-info button,.p3d-info input{pointer-events:auto;}

/* viewer: section, explode, version steps */
.cv-sheet{position:absolute;left:10px;right:58px;bottom:10px;display:flex;flex-direction:column;gap:6px;padding:8px 10px;background:rgba(255,255,255,.95);border-radius:12px;box-shadow:0 2px 10px rgba(0,0,0,.18);color:#1C1C1E;font-size:.78rem;}
.cv-sheet[hidden],.sh-row[hidden]{display:none;}
.sh-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap;}
.sh-row b{min-width:58px;}
.sh-row input[type=range]{flex:1;min-width:90px;accent-color:var(--orange);}
.sh-axes{display:inline-flex;gap:4px;}
.cv-sheet button{font:600 .72rem inherit;font-family:inherit;border:1px solid #cfd6dc;background:#fff;color:#1C1C1E;border-radius:999px;padding:3px 10px;cursor:pointer;}
.cv-sheet button[aria-pressed="true"]{background:var(--orange);border-color:var(--orange);color:#fff;}
.cv-head .icon-btn[disabled]{opacity:.35;}
.cv-head .icon-btn[hidden]{display:none;}

/* ---- small pieces the merged studio adds ---- */
.ai-note{font-size:.72rem;color:var(--ink-soft);margin-left:auto;white-space:nowrap;}
.muted{color:var(--ink-soft);font-size:.8rem;line-height:1.4;}

.filecard .fc-trace-form{border-top:1px solid var(--line);margin-top:10px;padding-top:6px;}
.filecard .fc-trace-row{display:flex;gap:8px;flex-wrap:wrap;margin:4px 0 6px;}
.filecard .fc-trace-row select,.filecard .fc-trace-row input{background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:8px;padding:6px 8px;font:inherit;font-size:.85rem;min-width:0;}
.filecard .fc-trace-row input{width:110px;}
.filecard .fc-trace-check{display:flex;gap:6px;align-items:center;font-size:.82rem;color:var(--ink-soft);margin-bottom:4px;}

/* conversation: live reply, one-line status, messages waiting their turn */
.stream-text p:last-child{margin-bottom:0;}
.think-note.live::after{content:"";display:inline-block;width:1.2em;text-align:left;animation:thinkEll 1.2s steps(1) infinite;}
@keyframes thinkEll{0%{content:"";}25%{content:".";}50%{content:"..";}75%{content:"...";}}
.msg.user.queued .bubble{opacity:.6;}
@media (prefers-reduced-motion:reduce){.think-note.live::after{animation:none;content:"...";}}