*{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#0a0a0e;--bg2:#0c0c12;
  --panel:#121219;--panel2:#17171f;--panel3:#1e1e28;
  --border:#1f1f2a;--border2:#2b2b3a;
  --fg:#e9eaf2;--mut:#9394a7;--mut2:#5f6076;
  --acc:#6c8cff;--acc-soft:rgba(108,140,255,.13);--acc-border:rgba(108,140,255,.34);
  --grn:#6fd695;--code-bg:#0e0e14;
  --rail-w:64px;--rail-h:58px;
  --tk-k:#ff8a80;--tk-s:#a5d6ff;--tk-n:#82b4ff;--tk-c:#7d7f92;--tk-f:#c9a8ff;--tk-b:#ffb86b;
}
html,body{height:100%}
body{background:var(--bg);color:var(--fg);font-family:"Space Grotesk","Inter",-apple-system,"Segoe UI",system-ui,sans-serif;font-size:14px;overflow:hidden;-webkit-font-smoothing:antialiased}
.app{display:flex;height:100vh;padding-left:var(--rail-w)}

/* ---------- icon rail ---------- */
.rail{position:fixed;left:0;top:0;bottom:0;width:var(--rail-w);z-index:40;
  background:var(--bg2);border-right:1px solid var(--border);
  display:flex;flex-direction:column;align-items:center;padding:12px 0 10px}
.rail-logo{width:40px;height:40px;display:flex;align-items:center;justify-content:center;border-radius:12px;margin-bottom:14px;text-decoration:none}
.rail-logo svg{width:23px;height:25px}
.rail-items{display:flex;flex-direction:column;align-items:center;gap:7px}
.rail-btn{position:relative;width:42px;height:42px;display:flex;align-items:center;justify-content:center;
  border-radius:12px;color:var(--mut);text-decoration:none;transition:color .15s,background .15s,box-shadow .15s}
.rail-btn svg{width:20px;height:20px;display:block}
.rail-btn:hover{color:var(--fg);background:var(--panel2)}
.rail-btn.on{color:var(--acc);background:var(--acc-soft);box-shadow:inset 0 0 0 1px var(--acc-border)}
.rail-btn.on::before{content:"";position:absolute;left:-11px;top:50%;transform:translateY(-50%);
  width:3px;height:20px;border-radius:0 3px 3px 0;background:var(--acc)}
.rail-foot{margin-top:auto;padding-top:10px}
.rail-av{width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  font-size:12px;font-weight:700;color:#0a0a0e;background:linear-gradient(135deg,#8fa8ff,#6c8cff 60%,#4a63c8);
  cursor:default;box-shadow:0 0 0 2px var(--bg2),0 0 0 3px var(--border2)}

/* ---------- sidebar ---------- */
.side{width:264px;min-width:264px;background:var(--bg2);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:14px 12px;gap:6px;transition:margin .2s ease,transform .2s ease}
body.collapsed .side{margin-left:-264px}
body.collapsed .expand-fab{display:flex}
.side-top{display:flex;align-items:center;justify-content:space-between;padding:0 4px 8px}
.brand{display:flex;gap:9px;align-items:center}
.logo{width:26px;height:26px;display:flex;align-items:center;justify-content:center}
.logo svg{width:26px;height:26px}
.wordmark{font-weight:600;font-size:15.5px;letter-spacing:-.01em;color:var(--fg)}
.icon-btn{background:none;border:none;color:var(--mut);cursor:pointer;padding:6px;border-radius:7px;display:flex}
.icon-btn:hover{color:var(--fg);background:var(--panel2)}
.icon-btn svg{width:16px;height:16px}
.expand-fab{display:none;position:fixed;top:14px;left:calc(var(--rail-w) + 12px);z-index:45;width:32px;height:32px;align-items:center;justify-content:center;background:var(--panel);border:1px solid var(--border2);border-radius:8px;color:var(--mut);cursor:pointer}
.expand-fab:hover{color:var(--fg)}
.expand-fab svg{width:15px;height:15px}
.new-btn{display:flex;align-items:center;gap:8px;width:100%;background:var(--acc-soft);border:1px solid var(--acc-border);color:var(--acc);border-radius:10px;padding:9px 11px;font:inherit;font-size:13px;font-weight:600;cursor:pointer;text-align:left;margin:4px 0 8px}
.new-btn svg{width:14px;height:14px;color:var(--acc)}
.new-btn:hover{background:rgba(108,140,255,.2)}
.new-btn,.file,.mode-chip,.mini,.cbtn,.send,.icon-btn,.hint-chip,.rail-btn{transition:all .15s ease}
.side-label{font-size:10.5px;text-transform:uppercase;letter-spacing:.07em;color:var(--mut2);padding:10px 8px 4px;font-weight:600}
.files{flex:0 1 auto;overflow-y:auto;display:flex;flex-direction:column;gap:2px}
.files:has(.dim){display:block}
.file{display:flex;align-items:center;gap:9px;padding:7px 8px;border-radius:8px;cursor:pointer;font-size:13px;color:#d3d4e0}
.file:hover{background:var(--panel2);transform:translateX(2px)}
.file svg{width:14px;height:14px;color:var(--mut);flex:none}
.file .fs{margin-left:auto;color:var(--mut2);font-size:11px}
.file.eng{cursor:default;color:var(--mut);font-size:12.5px}
.file.eng:hover{transform:none}
.pad{padding:8px}
.dim{color:var(--mut2);font-size:12px;line-height:1.5}
.side-foot{margin-top:auto;font-size:11px;color:var(--mut2);padding:10px 8px 2px;border-top:1px solid var(--border);display:flex;flex-direction:column;align-items:flex-start;gap:5px}
.side-credit{font-weight:600;letter-spacing:.02em;background:linear-gradient(100deg,#4a63c8 0%,#aabfff 25%,#6c8cff 50%,#c6d3ff 75%,#4a63c8 100%);background-size:220% 100%;-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent;animation:grad-sheen 4s linear infinite}
.side-foot .dot{width:7px;height:7px;border-radius:50%;background:var(--grn);flex:none;animation:pulse 2.4s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1;box-shadow:0 0 0 0 rgba(111,214,149,.35)}50%{opacity:.55;box-shadow:0 0 0 4px rgba(111,214,149,0)}}

/* ---------- thread ---------- */
.main{flex:1;display:flex;flex-direction:column;min-width:0;background:var(--bg)}
.thread{flex:1;overflow-y:auto;padding:30px 0 22px;display:flex;flex-direction:column;align-items:center}
.thread>*{width:min(720px,94%)}
.empty{margin:auto;text-align:center;padding:30px 0}
.hero-mark{width:44px;height:44px;margin:0 auto 20px;color:var(--acc);animation:hero-breathe 4s ease-in-out infinite}
.hero-mark svg{width:44px;height:44px}
@keyframes hero-breathe{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.7;transform:scale(.96)}}
.empty h1{font-size:24px;font-weight:600;letter-spacing:-.02em;margin-bottom:12px;color:var(--fg)}
.empty h1.grad{background:linear-gradient(100deg,#565a70 0%,#f2f3fa 25%,#878ba3 50%,#e9eaf2 75%,#565a70 100%);background-size:220% 100%;-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent;animation:grad-sheen 4s linear infinite}
@keyframes grad-sheen{0%{background-position:200% 0}100%{background-position:-20% 0}}
.empty p{color:var(--mut);max-width:480px;margin:0 auto 26px;line-height:1.6;font-size:14px}
.empty p b{color:#d3d4e0;font-weight:500}
.chips{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}
.hint-chip{display:flex;align-items:center;gap:7px;background:var(--panel);border:1px solid var(--border);border-radius:999px;padding:8px 15px;font-size:12.5px;color:var(--mut);cursor:pointer;font:inherit}
.hint-chip span{font-size:13px}
.hint-chip:hover{color:var(--fg);border-color:var(--border2);background:var(--panel2)}

/* ---------- messages ---------- */
.msg{margin-bottom:24px;display:flex;flex-direction:column;animation:msg-in .28s cubic-bezier(.2,.8,.3,1)}
@keyframes msg-in{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
.bubble{animation:bub-in .32s cubic-bezier(.2,.8,.3,1)}
@keyframes bub-in{from{opacity:0;transform:scale(.985)}to{opacity:1;transform:none}}
.msg .who{font-size:11px;text-transform:uppercase;letter-spacing:.07em;color:var(--mut2);margin-bottom:8px;display:flex;align-items:center;gap:7px;font-weight:600}
.msg .who .av{width:19px;height:19px;border-radius:5px;background:var(--panel3);display:inline-flex;align-items:center;justify-content:center;color:var(--acc)}
.msg .who .av svg{width:12px;height:12px}
.msg .who .t{font-size:10px;color:#4c4d60;text-transform:none;font-weight:400;margin-left:2px}
.msg:has(.bubble.input){align-items:flex-end}
.msg:has(.bubble.input) .who{flex-direction:row-reverse}
.bubble{background:var(--code-bg);border:1px solid var(--border);border-radius:12px;padding:13px 15px;font-family:"SF Mono","Cascadia Code","JetBrains Mono",ui-monospace,monospace;font-size:12.5px;line-height:1.65;white-space:pre-wrap;word-break:break-word;max-height:460px;overflow-y:auto;color:#d0d2de}
.bubble.input{background:#15151e;max-height:180px;color:#c6c8d4}
.bubble .meta{font-family:"Space Grotesk","Inter",-apple-system,sans-serif;color:var(--mut);font-size:11.5px;margin-top:10px;white-space:normal;line-height:1.55}
.row{display:flex;gap:8px;margin-top:8px}
.mini{background:var(--panel);border:1px solid var(--border);color:#d3d4e0;border-radius:8px;padding:5px 12px;font-size:12px;cursor:pointer;font:inherit}
.mini:hover{border-color:var(--acc-border);background:var(--panel2);color:var(--fg)}
.chip{display:inline-block;background:var(--panel2);border:1px solid var(--border);border-radius:999px;padding:3px 11px;font-size:11px;color:var(--mut);margin:2px;font-family:"Space Grotesk","Inter",sans-serif}
.chip b{color:#d3d4e0;font-weight:500}
.chip.hit{border-color:rgba(111,214,149,.4);color:#bfe9cd}
.chip.hit b{color:var(--grn)}
.err{color:#ff9a92}
.ok{color:var(--grn)}

/* lua tokens */
.tk-k{color:var(--tk-k)}
.tk-s{color:var(--tk-s)}
.tk-n{color:var(--tk-n)}
.tk-c{color:var(--tk-c);font-style:italic}
.tk-f{color:var(--tk-f)}
.tk-b{color:var(--tk-b)}

/* ---------- composer ---------- */
.composer-wrap{padding:0 0 16px;display:flex;flex-direction:column;align-items:center;gap:7px}
.composer-wrap>*{width:min(720px,94%)}
.composer{position:relative;border-radius:20px;padding:1.5px;background:linear-gradient(120deg,#2b2b3a,#4a4f6b,#262633,#565c7d,#2b2b3a);background-size:300% 300%;animation:ring-sheen 7s ease-in-out infinite;transition:box-shadow .3s ease}
.composer:focus-within{background:linear-gradient(120deg,#4a63c8,#aabfff 30%,#6c8cff 55%,#8fa4e8 80%,#4a63c8);background-size:300% 300%;animation:ring-sheen 3.5s linear infinite;box-shadow:0 0 0 4px rgba(108,140,255,.08),0 8px 32px rgba(0,0,0,.5)}
.composer-in{background:var(--panel);border-radius:18.5px;padding:11px 11px 8px;display:flex;flex-direction:column;gap:4px}
@keyframes ring-sheen{0%{background-position:0% 50%}50%{background-position:100% 50%}100%{background-position:0% 50%}}
#composer{background:none;border:none;color:var(--fg);font:inherit;font-size:14.5px;resize:none;max-height:200px;outline:none;line-height:1.5;padding:2px 6px 8px;caret-color:var(--acc)}
#composer::placeholder{color:#565769;transition:color .2s}
.composer:focus-within #composer::placeholder{color:#454659}
.composer-bar{display:flex;align-items:center;justify-content:space-between;gap:8px}
.cb-left{display:flex;align-items:center;gap:6px;min-width:0;flex-wrap:wrap}
.cbtn{width:30px;height:30px;flex:none;background:none;border:none;color:var(--mut);border-radius:999px;cursor:pointer;display:flex;align-items:center;justify-content:center}
.cbtn:hover{color:var(--fg);background:var(--panel2)}
.cbtn svg{width:16px;height:16px}
.mode-group{display:flex;gap:4px}
.mode-chip{background:none;border:1px solid transparent;color:var(--mut);padding:5px 11px;border-radius:999px;cursor:pointer;font:inherit;font-size:12px;white-space:nowrap}
.mode-chip:hover{color:var(--fg);transform:translateY(-1px)}
.mode-chip.on{background:var(--acc-soft);color:var(--acc);border-color:var(--acc-border)}
.send{width:30px;height:30px;flex:none;background:var(--acc);color:#0a0a0e;border:none;border-radius:999px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:transform .12s ease,filter .15s,box-shadow .2s}
.send:hover{filter:brightness(1.1);transform:translateY(-1px);box-shadow:0 2px 12px rgba(108,140,255,.35)}
.send:active{transform:scale(.9)}
.send svg{width:15px;height:15px}
.composer-hint{font-size:10.5px;color:#4c4d60;text-align:center}

/* scrollbars hidden — scrolling still works */
::-webkit-scrollbar{width:0;height:0}
*{scrollbar-width:none;-ms-overflow-style:none}

/* verified-engine checkmark: gradient ring draws, then gradient tick draws */
svg.vmark{width:15px;height:15px;flex:none;overflow:visible}
svg.vmark .ring, svg.vmark .tick{stroke:url(#lld-grad);stroke-linecap:round;stroke-linejoin:round}
svg.vmark .ring{stroke-width:1.9;stroke-dasharray:56.6;stroke-dashoffset:56.6;animation:vmark-ring 1.1s cubic-bezier(.6,.05,.35,1) forwards}
svg.vmark .tick{stroke-width:2.1;stroke-dasharray:13;stroke-dashoffset:13;animation:vmark-tick .55s cubic-bezier(.65,0,.35,1) .85s forwards}
@keyframes vmark-ring{to{stroke-dashoffset:0}}
@keyframes vmark-tick{to{stroke-dashoffset:0}}

/* realtime agent work panel */
.msg.work .bubble{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:0;overflow:hidden}
.whead{display:flex;align-items:center;gap:8px;padding:10px 14px;border-bottom:1px solid var(--border);font-size:12.5px}
.whead b{font-weight:600;letter-spacing:.01em;background:linear-gradient(100deg,#7a7f99,#f2f3fa 35%,#9aa0bd 60%,#e9eaf2 80%,#7a7f99);background-size:220% 100%;-webkit-background-clip:text;background-clip:text;color:transparent;animation:sheen 2.6s linear infinite}
@keyframes sheen{to{background-position:-220% 0}}
.welap{margin-left:auto;font-size:11px;color:var(--mut);font-variant-numeric:tabular-nums}
.spin{width:13px;height:13px;border-radius:50%;border:1.6px solid #2b2b3a;border-top-color:var(--acc);animation:spn .8s linear infinite;flex:none}
@keyframes spn{to{transform:rotate(360deg)}}
.okdot,.errdot{width:13px;height:13px;border-radius:50%;flex:none}
.okdot{background:radial-gradient(circle at 35% 35%,#9fe3b0,#3f9e58)}
.errdot{background:radial-gradient(circle at 35% 35%,#f0a8a0,#c0493f)}
.steps{padding:8px 4px 10px;display:flex;flex-direction:column}
.step{display:flex;align-items:baseline;gap:8px;padding:4px 14px;font-size:12px;opacity:0;animation:stepin .25s ease forwards}
@keyframes stepin{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
.step .ai{color:#7d7f92;flex:none;align-self:center}
.step .ai .adot{width:11px;height:11px;display:block}
.step b{font-weight:600;color:var(--fg);white-space:nowrap}
.step .st{color:var(--mut);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0;flex:1}
.step .stt{color:#454659;font-size:10.5px;font-variant-numeric:tabular-nums;flex:none}
.pm{font-size:11px;font-weight:600;font-variant-numeric:tabular-nums;flex:none}
.pm.p{color:var(--grn)}
.pm.m{color:#e0705f}
.who .av .adot{width:13px;height:13px;display:block}

/* ---------- sbs ---------- */
.sbs-btn{display:flex;align-items:center;gap:8px;width:100%;background:none;border:1px solid var(--border);color:var(--mut);border-radius:10px;padding:8px 11px;font:inherit;font-size:12.5px;font-weight:500;cursor:pointer;text-align:left;margin:-2px 0 8px;text-decoration:none;transition:all .15s ease}
.sbs-btn svg{width:14px;height:14px;color:var(--mut)}
.sbs-btn:hover{border-color:var(--border2);background:var(--panel2);color:var(--fg)}
.grad{background:linear-gradient(100deg,#565a70 0%,#f2f3fa 25%,#878ba3 50%,#e9eaf2 75%,#565a70 100%);background-size:220% 100%;-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent;animation:grad-sheen 4s linear infinite}

/* sbs page sits right of the rail */
body.sbs-page{padding-left:var(--rail-w)}

/* ---------- mobile: rail -> bottom bar ---------- */
@media (max-width:860px){
  .app{padding-left:0;padding-bottom:var(--rail-h)}
  .rail{top:auto;bottom:0;left:0;right:0;width:100%;height:var(--rail-h);
    flex-direction:row;border-right:0;border-top:1px solid var(--border);
    padding:0 14px;justify-content:center}
  .rail-logo{display:none}
  .rail-items{flex-direction:row;gap:4px;justify-content:space-evenly;width:100%;max-width:430px}
  .rail-btn{width:46px;height:46px;flex:none}
  .rail-btn.on::before{left:50%;top:-6px;transform:translateX(-50%);width:22px;height:3px;border-radius:0 0 3px 3px}
  .rail-foot{display:none}
  body.sbs-page{padding-left:0;padding-bottom:var(--rail-h)}
  /* sidebar becomes an overlay drawer */
  .side{position:fixed;left:0;top:0;bottom:var(--rail-h);width:272px;min-width:272px;z-index:35;
    margin-left:0;transform:translateX(0);box-shadow:8px 0 40px rgba(0,0,0,.55)}
  body.collapsed .side{margin-left:0;transform:translateX(-100%)}
  .expand-fab{left:14px}
  .mode-chip{padding:5px 9px;font-size:11.5px}
  .thread>*{width:94%}
  .composer-wrap>*{width:94%}
}