/* ================================================================
   FLUX — AI & automation studio
   LAYOUT: IDE shell. Fixed icon rail + command palette + status bar.
   No top navigation anywhere.
   ================================================================ */
:root{
  --bg:#080a10;
  --bg2:#0d1018;
  --bg3:#141824;
  --bg4:#1b2030;
  --edge:#232a3d;
  --edge2:#171c29;
  --txt:#e6e9f2;
  --txt2:#9aa3bd;
  --dim:#646d87;
  --indigo:#6366f1;
  --indigo-lt:#818cf8;
  --cyan:#22d3ee;
  --lime:#a3e635;
  --amber:#fbbf24;
  --rose:#fb7185;
  --ok:#34d399;
  --rail:64px;
  --status:30px;
  --ease:cubic-bezier(.22,1,.36,1);
  --mono:"JetBrains Mono",ui-monospace,"SF Mono",Menlo,monospace;
  --sans:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--sans);background:var(--bg);color:var(--txt);
  line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden;
  font-size:15px}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{margin:0;padding:0;list-style:none}
button{font-family:inherit;cursor:pointer}
h1,h2,h3{margin:0 0 .5em;font-weight:650;line-height:1.12;letter-spacing:-.03em}
h1{font-size:clamp(2rem,4.4vw,3.3rem)}
h2{font-size:clamp(1.5rem,2.8vw,2.1rem)}
h3{font-size:clamp(.98rem,1.5vw,1.12rem);letter-spacing:-.02em}
p{margin:0 0 .95rem}
code,.mono{font-family:var(--mono)}
::selection{background:var(--indigo);color:#fff}

/* grid backdrop */
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.5;
  background-image:linear-gradient(rgba(99,102,241,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(99,102,241,.045) 1px,transparent 1px);
  background-size:44px 44px;
  mask-image:radial-gradient(ellipse 100% 70% at 50% 0%,#000,transparent 75%);
  -webkit-mask-image:radial-gradient(ellipse 100% 70% at 50% 0%,#000,transparent 75%)}

/* ---------- demo bar ---------- */
.demo-bar{position:fixed;top:0;left:0;right:0;height:28px;z-index:500;
  background:var(--indigo);color:#fff;font-family:var(--mono);font-size:.7rem;
  display:flex;gap:.85rem;align-items:center;justify-content:center;flex-wrap:wrap;
  letter-spacing:.02em}
.demo-bar a{text-decoration:underline}

/* ================= IDE SHELL ================= */
.rail{position:fixed;top:28px;bottom:var(--status);left:0;width:var(--rail);z-index:400;
  background:var(--bg2);border-right:1px solid var(--edge2);
  display:flex;flex-direction:column;align-items:center;padding:.7rem 0;gap:.25rem}
.rail .mark{width:34px;height:34px;border-radius:9px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--indigo),var(--cyan));color:#fff;font-weight:800;
  font-size:.9rem;margin-bottom:.8rem;flex:0 0 auto}
.rail a{position:relative;width:42px;height:42px;border-radius:10px;display:grid;place-items:center;
  color:var(--dim);font-size:1.05rem;transition:.18s;flex:0 0 auto}
.rail a:hover{color:var(--txt);background:var(--bg3)}
.rail a.on{color:var(--txt);background:var(--bg4)}
.rail a.on::before{content:"";position:absolute;left:-1px;top:9px;bottom:9px;width:2px;
  border-radius:2px;background:var(--indigo)}
.rail a .tip{position:absolute;left:52px;white-space:nowrap;background:var(--bg4);
  border:1px solid var(--edge);padding:.28rem .6rem;border-radius:6px;font-size:.74rem;
  font-family:var(--mono);color:var(--txt);opacity:0;visibility:hidden;transition:.16s;
  pointer-events:none;z-index:10}
.rail a:hover .tip{opacity:1;visibility:visible;left:56px}
.rail .sp{flex:1}
.rail .kbtn{width:42px;height:42px;border-radius:10px;background:var(--bg3);border:1px solid var(--edge);
  color:var(--txt2);font-family:var(--mono);font-size:.66rem;display:grid;place-items:center;
  transition:.18s}
.rail .kbtn:hover{color:var(--txt);border-color:var(--indigo)}

/* main region */
.app{margin-left:var(--rail);margin-top:28px;margin-bottom:var(--status);min-height:calc(100vh - 28px - var(--status))}
@media(max-width:820px){
  :root{--rail:0px}
  .rail{top:auto;bottom:var(--status);left:0;right:0;width:100%;height:52px;flex-direction:row;
    justify-content:space-around;padding:0 .4rem;border-right:0;border-top:1px solid var(--edge2)}
  .rail .mark,.rail .sp{display:none}
  .rail a .tip{display:none}
  .rail a.on::before{left:9px;right:9px;top:-1px;bottom:auto;width:auto;height:2px}
  .app{margin-bottom:calc(var(--status) + 52px)}
}

/* status bar */
.status{position:fixed;bottom:0;left:0;right:0;height:var(--status);z-index:400;
  background:var(--bg2);border-top:1px solid var(--edge2);display:flex;align-items:center;
  gap:1.1rem;padding:0 1rem;font-family:var(--mono);font-size:.7rem;color:var(--dim)}
.status .s{display:flex;align-items:center;gap:.4rem}
.status .dot{width:6px;height:6px;border-radius:50%;background:var(--ok);
  animation:blink 2.4s ease-in-out infinite}
@keyframes blink{50%{opacity:.3}}
.status .sp{flex:1}
@media(max-width:700px){.status .hide-s{display:none}}

/* ---------- content shell ---------- */
.wrap{width:min(1180px,92vw);margin-inline:auto}
.narrow{width:min(760px,92vw);margin-inline:auto}
section{padding:clamp(40px,5.5vw,84px) 0;position:relative}
.center{text-align:center}
.lead{font-size:clamp(.98rem,1.3vw,1.08rem);color:var(--txt2);max-width:58ch}
.center .lead{margin-inline:auto}
.dim{color:var(--dim)}

/* file-tab header (replaces page title) */
.tabbar{display:flex;align-items:stretch;border-bottom:1px solid var(--edge2);background:var(--bg2);
  overflow-x:auto;scrollbar-width:none}
.tabbar::-webkit-scrollbar{display:none}
.tabbar .tab{display:flex;align-items:center;gap:.5rem;padding:.62rem 1rem;font-family:var(--mono);
  font-size:.76rem;color:var(--dim);border-right:1px solid var(--edge2);white-space:nowrap;
  transition:.18s;position:relative}
.tabbar .tab:hover{color:var(--txt2);background:var(--bg3)}
.tabbar .tab.on{color:var(--txt);background:var(--bg);border-bottom:1px solid var(--bg)}
.tabbar .tab.on::before{content:"";position:absolute;top:0;left:0;right:0;height:2px;background:var(--indigo)}
.tabbar .tab i{font-style:normal;font-size:.8rem}
.crumb{font-family:var(--mono);font-size:.72rem;color:var(--dim);padding:.6rem 0 0}
.crumb a:hover{color:var(--cyan)}

/* labels */
.kbd{display:inline-grid;place-items:center;min-width:20px;height:20px;padding:0 5px;
  border-radius:5px;background:var(--bg4);border:1px solid var(--edge);font-family:var(--mono);
  font-size:.68rem;color:var(--txt2)}
.tag{display:inline-flex;align-items:center;gap:.4rem;font-family:var(--mono);font-size:.68rem;
  padding:.24rem .6rem;border-radius:5px;background:var(--bg3);border:1px solid var(--edge);
  color:var(--txt2);letter-spacing:.02em}
.tag.i{color:var(--indigo-lt);border-color:rgba(99,102,241,.35);background:rgba(99,102,241,.1)}
.tag.c{color:var(--cyan);border-color:rgba(34,211,238,.3);background:rgba(34,211,238,.08)}
.tag.l{color:var(--lime);border-color:rgba(163,230,53,.3);background:rgba(163,230,53,.08)}
.tag.a{color:var(--amber);border-color:rgba(251,191,36,.3);background:rgba(251,191,36,.08)}
.tag.ok{color:var(--ok);border-color:rgba(52,211,153,.3);background:rgba(52,211,153,.08)}

/* panels */
.panel{background:var(--bg2);border:1px solid var(--edge2);border-radius:12px;overflow:hidden}
.panel-head{display:flex;align-items:center;gap:.6rem;padding:.6rem .9rem;background:var(--bg3);
  border-bottom:1px solid var(--edge2);font-family:var(--mono);font-size:.74rem;color:var(--txt2)}
.panel-head .dots{display:flex;gap:.3rem}
.panel-head .dots i{width:9px;height:9px;border-radius:50%;background:var(--edge)}
.panel-head .sp{flex:1}
.panel-body{padding:1.1rem}
.card{background:var(--bg2);border:1px solid var(--edge2);border-radius:12px;padding:1.3rem;
  transition:border-color .25s,transform .3s var(--ease)}
.card:hover{border-color:var(--edge)}
.g,.g2,.g3,.g4{display:grid;gap:1rem}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:1050px){.g4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:840px){.g3{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.g2,.g3,.g4{grid-template-columns:1fr}}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.45rem;padding:.62rem 1.15rem;
  border-radius:8px;font-weight:600;font-size:.86rem;border:1px solid var(--edge);
  background:var(--bg3);color:var(--txt);transition:.2s}
.btn:hover{border-color:var(--indigo);background:var(--bg4)}
.btn-p{background:var(--indigo);border-color:var(--indigo);color:#fff}
.btn-p:hover{background:var(--indigo-lt);border-color:var(--indigo-lt)}
.btn-sm{padding:.42rem .8rem;font-size:.78rem}
.btn-full{width:100%}
.btn:disabled{opacity:.45;cursor:not-allowed}

/* ---------- node graph ---------- */
.graph{position:relative;background:var(--bg2);border:1px solid var(--edge2);border-radius:12px;
  overflow:hidden;min-height:340px}
.graph .gridbg{position:absolute;inset:0;pointer-events:none;opacity:.6;
  background-image:radial-gradient(var(--edge) 1px,transparent 1px);background-size:22px 22px}
.graph svg.wires{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.node{position:absolute;background:var(--bg3);border:1px solid var(--edge);border-radius:10px;
  padding:.6rem .75rem;min-width:130px;font-family:var(--mono);font-size:.72rem;
  transition:border-color .25s,transform .3s var(--ease),box-shadow .3s;cursor:default;z-index:2}
.node:hover{border-color:var(--indigo);transform:translateY(-2px);
  box-shadow:0 8px 24px rgba(99,102,241,.25)}
.node .nh{display:flex;align-items:center;gap:.4rem;margin-bottom:.25rem}
.node .nh i{width:7px;height:7px;border-radius:2px;font-style:normal}
.node b{font-weight:600;font-size:.74rem;color:var(--txt)}
.node small{color:var(--dim);font-size:.66rem;display:block}
.node.run{border-color:var(--lime);box-shadow:0 0 0 1px rgba(163,230,53,.25),0 8px 24px rgba(163,230,53,.18)}
.node.done{border-color:var(--ok)}
.wire{stroke:var(--edge);stroke-width:1.5;fill:none}
.wire.hot{stroke:var(--indigo);stroke-width:2}
.wire.flowing{stroke:var(--lime);stroke-width:2;stroke-dasharray:5 4;animation:dash .6s linear infinite}
@keyframes dash{to{stroke-dashoffset:-18}}

/* ---------- command palette ---------- */
.pal-ovl{position:fixed;inset:0;background:rgba(4,6,12,.7);backdrop-filter:blur(3px);z-index:600;
  opacity:0;visibility:hidden;transition:.2s}
.pal-ovl.on{opacity:1;visibility:visible}
.pal{position:fixed;top:14vh;left:50%;transform:translateX(-50%) scale(.97);z-index:610;
  width:min(580px,92vw);background:var(--bg2);border:1px solid var(--edge);border-radius:12px;
  box-shadow:0 30px 80px rgba(0,0,0,.6);opacity:0;visibility:hidden;transition:.22s var(--ease);
  overflow:hidden}
.pal.on{opacity:1;visibility:visible;transform:translateX(-50%) scale(1)}
.pal input{width:100%;padding:.95rem 1.1rem;background:none;border:0;border-bottom:1px solid var(--edge2);
  color:var(--txt);font-family:var(--mono);font-size:.9rem}
.pal input:focus{outline:none}
.pal-list{max-height:320px;overflow-y:auto;padding:.4rem}
.pal-item{display:flex;align-items:center;gap:.7rem;padding:.6rem .8rem;border-radius:8px;
  font-size:.85rem;color:var(--txt2);cursor:pointer;transition:.14s}
.pal-item:hover,.pal-item.sel{background:var(--bg4);color:var(--txt)}
.pal-item .ic{width:22px;text-align:center;color:var(--indigo-lt)}
.pal-item .sub{margin-left:auto;font-family:var(--mono);font-size:.68rem;color:var(--dim)}
.pal-foot{padding:.5rem .9rem;border-top:1px solid var(--edge2);font-family:var(--mono);
  font-size:.66rem;color:var(--dim);display:flex;gap:.9rem;flex-wrap:wrap}

/* ---------- chat ---------- */
.chat{display:flex;flex-direction:column;height:400px}
.chat-log{flex:1;overflow-y:auto;padding:1rem}
.bubble{max-width:80%;padding:.6rem .9rem;border-radius:11px;font-size:.87rem;line-height:1.55;
  margin-bottom:.55rem;animation:pop .28s var(--ease)}
@keyframes pop{from{opacity:0;transform:translateY(7px)}}
.bubble.bot{background:var(--bg3);border:1px solid var(--edge2);border-bottom-left-radius:4px}
.bubble.usr{background:var(--indigo);color:#fff;margin-left:auto;border-bottom-right-radius:4px}
.bubble .who{font-family:var(--mono);font-size:.64rem;opacity:.65;display:block;margin-bottom:.2rem}
.typing{display:flex;gap:.22rem;padding:.65rem .9rem;background:var(--bg3);border:1px solid var(--edge2);
  border-radius:11px;border-bottom-left-radius:4px;width:max-content}
.typing i{width:6px;height:6px;border-radius:50%;background:var(--dim);animation:bnc 1.2s infinite}
.typing i:nth-child(2){animation-delay:.15s}.typing i:nth-child(3){animation-delay:.3s}
@keyframes bnc{0%,60%,100%{transform:translateY(0);opacity:.4}30%{transform:translateY(-5px);opacity:1}}
.chat-quick{display:flex;gap:.35rem;flex-wrap:wrap;padding:.5rem .8rem 0}
.chat-quick button{background:rgba(99,102,241,.12);border:1px solid rgba(99,102,241,.35);
  color:var(--indigo-lt);padding:.32rem .7rem;border-radius:6px;font-size:.76rem;
  font-family:var(--mono);transition:.18s}
.chat-quick button:hover{background:var(--indigo);color:#fff}
.chat-in{display:flex;gap:.5rem;padding:.7rem;border-top:1px solid var(--edge2)}
.chat-in input{flex:1;padding:.55rem .8rem;border-radius:8px;background:var(--bg3);
  border:1px solid var(--edge);color:var(--txt);font-family:var(--sans);font-size:.86rem}
.chat-in input:focus{outline:none;border-color:var(--indigo)}
.chat-in button{width:36px;height:36px;border-radius:8px;border:0;background:var(--indigo);color:#fff}

/* trace panel */
.trace{font-family:var(--mono);font-size:.72rem;background:var(--bg);border-top:1px solid var(--edge2);
  padding:.7rem .9rem;max-height:135px;overflow-y:auto;line-height:1.75}
.trace .t-in{color:var(--cyan)}
.trace .t-ok{color:var(--ok)}
.trace .t-w{color:var(--amber)}
.trace .t-d{color:var(--dim)}

/* code block */
.code{font-family:var(--mono);font-size:.76rem;background:var(--bg);border:1px solid var(--edge2);
  border-radius:10px;padding:.9rem 1rem;overflow-x:auto;line-height:1.8;white-space:pre;color:var(--txt2)}
.code .k{color:var(--indigo-lt)}
.code .s{color:var(--lime)}
.code .c{color:var(--dim)}
.code .n{color:var(--amber)}

/* split pane */
.split{display:grid;grid-template-columns:1fr 1fr;gap:1rem;align-items:start}
@media(max-width:900px){.split{grid-template-columns:1fr}}

/* metric */
.metric b{display:block;font-family:var(--mono);font-size:clamp(1.4rem,2.6vw,1.9rem);
  font-weight:600;letter-spacing:-.03em;line-height:1}
.metric small{color:var(--dim);font-size:.73rem;font-family:var(--mono)}

/* prompt lab */
.slider-row{margin-bottom:.9rem}
.slider-row label{display:flex;justify-content:space-between;font-family:var(--mono);font-size:.72rem;
  color:var(--txt2);margin-bottom:.35rem}
.slider-row label b{color:var(--txt)}
input[type=range]{width:100%;accent-color:var(--indigo);height:3px}
select.sel,input.inp,textarea.inp{width:100%;padding:.55rem .75rem;border-radius:8px;
  background:var(--bg3);border:1px solid var(--edge);color:var(--txt);font-family:var(--mono);
  font-size:.8rem}
select.sel:focus,input.inp:focus,textarea.inp:focus{outline:none;border-color:var(--indigo)}
select.sel option{background:var(--bg3)}
textarea.inp{min-height:96px;resize:vertical;line-height:1.65}

/* table */
.tw{overflow-x:auto;border:1px solid var(--edge2);border-radius:10px}
table{width:100%;border-collapse:collapse;font-size:.83rem;min-width:600px}
th{text-align:left;padding:.6rem .8rem;font-family:var(--mono);font-size:.68rem;
  text-transform:uppercase;letter-spacing:.06em;color:var(--dim);background:var(--bg3);
  border-bottom:1px solid var(--edge2);white-space:nowrap}
td{padding:.6rem .8rem;border-bottom:1px solid var(--edge2);color:var(--txt2)}
tbody tr:last-child td{border-bottom:0}
tbody tr:hover{background:var(--bg3)}
td b{color:var(--txt);font-weight:600}

/* faq */
details.q{background:var(--bg2);border:1px solid var(--edge2);border-radius:10px;
  padding:.9rem 1.1rem;margin-bottom:.6rem}
details.q summary{font-weight:600;list-style:none;display:flex;justify-content:space-between;
  gap:1rem;align-items:center;cursor:pointer;font-size:.92rem}
details.q summary::-webkit-details-marker{display:none}
details.q summary::after{content:"+";color:var(--indigo-lt);font-family:var(--mono);
  font-size:1.1rem;transition:transform .28s}
details.q[open] summary::after{transform:rotate(45deg)}
details.q p{margin:.7rem 0 0;color:var(--txt2);font-size:.88rem}

/* form */
.field{margin-bottom:.85rem}
.field label{display:block;font-family:var(--mono);font-size:.72rem;color:var(--txt2);margin-bottom:.35rem}
.field input,.field select,.field textarea{width:100%;padding:.65rem .85rem;border-radius:8px;
  background:var(--bg3);border:1px solid var(--edge);color:var(--txt);font-family:var(--sans);
  font-size:.88rem;transition:.2s}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--indigo);
  box-shadow:0 0 0 3px rgba(99,102,241,.15)}
.field select option{background:var(--bg3)}
.field.err input,.field.err textarea{border-color:var(--rose)}
.field .msg{font-family:var(--mono);font-size:.7rem;color:var(--rose);display:none;margin-top:.28rem}
.field.err .msg{display:block}
textarea{min-height:100px;resize:vertical}

/* footer */
.ftr{border-top:1px solid var(--edge2);background:var(--bg2);padding:2.4rem 0 1.4rem}
.ftr h4{font-family:var(--mono);font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--dim);margin-bottom:.75rem;font-weight:500}
.ftr a{color:var(--txt2);font-size:.85rem}
.ftr a:hover{color:var(--cyan)}
.ftr li{margin-bottom:.38rem}
.fg{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:1.8rem}
@media(max-width:860px){.fg{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.fg{grid-template-columns:1fr}}
.fbot{margin-top:1.9rem;padding-top:1rem;border-top:1px solid var(--edge2);display:flex;
  justify-content:space-between;flex-wrap:wrap;gap:.7rem;font-family:var(--mono);
  font-size:.7rem;color:var(--dim)}

/* toast */
.toast{position:fixed;bottom:calc(var(--status) + 14px);left:50%;
  transform:translateX(-50%) translateY(80px);background:var(--bg4);border:1px solid var(--indigo);
  color:var(--txt);padding:.6rem 1.1rem;border-radius:8px;font-family:var(--mono);font-size:.78rem;
  z-index:550;transition:transform .3s var(--ease)}
.toast.on{transform:translateX(-50%) translateY(0)}
@media(max-width:820px){.toast{bottom:calc(var(--status) + 66px)}}

/* reveal */
[data-r]{opacity:0;transform:translateY(18px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
[data-r].in{opacity:1;transform:none}

.note{font-family:var(--mono);font-size:.72rem;color:var(--dim)}
.hr{height:1px;background:var(--edge2);margin:2rem 0}
.tick li{display:flex;gap:.5rem;font-size:.85rem;color:var(--txt2);margin-bottom:.32rem}
.tick li::before{content:"→";color:var(--indigo-lt);flex:0 0 auto;font-family:var(--mono)}
@media (prefers-reduced-motion:reduce){*{animation-duration:.01ms!important;transition-duration:.01ms!important}
 [data-r]{opacity:1;transform:none}}