:root {
  color-scheme: dark;
  --bg: #07090d;
  --bg-2: #0c1017;
  --panel: #10151d;
  --panel-2: #151b25;
  --border: #1f2733;
  --border-2: #2a3444;
  --text: #e7ebf2;
  --muted: #8a94a6;
  --faint: #5b6577;
  --violet: #8b5cf6;
  --cyan: #22d3ee;
  --grad: linear-gradient(135deg, var(--violet), var(--cyan));
  --ok: #34d399;
  --warn: #fbbf24;
  --err: #f87171;
  --radius: 14px;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font: 15px/1.55 var(--sans);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(139, 92, 246, 0.14), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, rgba(34, 211, 238, 0.10), transparent 60%),
    var(--bg);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }
.mono { font-family: var(--mono); }
.small { font-size: 12.5px; }
.muted { color: var(--muted); }

/* header */
.top {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  background: rgba(7, 9, 13, 0.7);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 5;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none !important; }
.logo { width: 30px; height: 30px; }
.name { font: 600 19px/1 var(--mono); letter-spacing: -0.02em; }
.dash { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.tagline { margin: 0; color: var(--muted); font-size: 14px; flex: 1; }
.tagline em { color: var(--text); font-style: normal; font-weight: 600; }
.gh {
  margin-left: auto;
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 12px; border: 1px solid var(--border-2); border-radius: 999px;
  color: var(--text); font-size: 13px; text-decoration: none !important;
}
.gh:hover { border-color: var(--violet); }
.gh svg { width: 16px; height: 16px; }

/* layout */
.layout {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 20px;
  padding: 20px 24px;
  max-width: 1320px;
  width: 100%;
  margin: 0 auto;
  align-items: start;
}

/* chat */
.chat {
  display: flex;
  flex-direction: column;
  min-height: 0;
  height: calc(100vh - 140px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(16, 21, 29, 0.72);
  overflow: hidden;
}
.messages { flex: 1; overflow-y: auto; padding: 26px 28px; scroll-behavior: smooth; }
.welcome { max-width: 640px; margin: 8vh auto 0; text-align: center; }
.welcome h1 {
  font-size: 30px; line-height: 1.2; letter-spacing: -0.02em; margin: 0 0 14px;
  background: linear-gradient(180deg, #fff, #b7c0d1); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.welcome p { color: var(--muted); margin: 0 auto 22px; max-width: 560px; }
.welcome b { color: var(--text); font-weight: 600; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.chips button {
  background: var(--panel-2); border: 1px solid var(--border-2); color: var(--text);
  padding: 8px 14px; border-radius: 999px; font: inherit; font-size: 13.5px; cursor: pointer;
}
.chips button:hover:not(:disabled) { border-color: var(--violet); }

.msg { display: flex; gap: 12px; margin: 0 auto 22px; max-width: 760px; }
.msg .who {
  flex: none; width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center;
  font: 600 12px var(--mono); color: #fff;
}
.msg.user .who { background: #273142; }
.msg.bot .who { background: var(--grad); }
.msg .body { min-width: 0; flex: 1; padding-top: 4px; white-space: pre-wrap; word-wrap: break-word; }
.msg.user .body { color: #cfd6e3; }
.msg .meta { margin-top: 8px; font: 12px var(--mono); color: var(--faint); }
.msg .body code { font-family: var(--mono); font-size: 0.9em; background: var(--panel-2); padding: 1px 5px; border-radius: 5px; }
.msg .body pre { background: #0a0e14; border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; overflow-x: auto; }
.msg .body pre code { background: none; padding: 0; }
.cursor::after {
  content: ''; display: inline-block; width: 8px; height: 1.05em; margin-left: 2px; vertical-align: -0.15em;
  background: var(--cyan); animation: blink 1s steps(2) infinite;
}
@keyframes blink { 50% { opacity: 0; } }
.msg.error .body { color: var(--err); }

.composer { display: flex; gap: 10px; padding: 14px; border-top: 1px solid var(--border); background: var(--bg-2); }
.composer textarea {
  flex: 1; resize: none; max-height: 180px; min-height: 44px;
  background: var(--panel); color: var(--text); border: 1px solid var(--border-2); border-radius: 12px;
  padding: 11px 14px; font: inherit;
}
.composer textarea:focus { outline: none; border-color: var(--violet); box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.18); }

/* buttons */
button {
  font: 500 14px var(--sans); color: var(--text); background: var(--panel-2);
  border: 1px solid var(--border-2); border-radius: 10px; padding: 10px 16px; cursor: pointer;
}
button:hover:not(:disabled) { border-color: #3b4658; }
button:disabled { opacity: 0.45; cursor: not-allowed; }
button.primary { background: var(--grad); border: 0; color: #fff; font-weight: 600; }
button.primary:hover:not(:disabled) { filter: brightness(1.08); }
button.wide { width: 100%; }

/* side cards */
.side {
  display: flex; flex-direction: column; gap: 14px; min-width: 0;
  max-height: calc(100vh - 140px); overflow-y: auto; scrollbar-width: thin; padding-right: 2px;
}
.card {
  border: 1px solid var(--border); border-radius: var(--radius); background: rgba(16, 21, 29, 0.78);
  padding: 16px;
}
.card-h { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.card h2 { font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin: 0; font-weight: 600; }
.badge { font: 500 11.5px var(--mono); padding: 3px 8px; border-radius: 999px; background: var(--panel-2); color: var(--muted); border: 1px solid var(--border-2); }
.badge.ok { color: var(--ok); border-color: rgba(52, 211, 153, 0.35); }
.badge.err { color: var(--err); border-color: rgba(248, 113, 113, 0.35); }
.field { display: block; margin-bottom: 12px; }
.field > span { display: flex; justify-content: space-between; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.field b { color: var(--text); font: 500 12.5px var(--mono); }
select {
  width: 100%; background: var(--panel-2); color: var(--text); border: 1px solid var(--border-2);
  border-radius: 10px; padding: 9px 10px; font: inherit; font-size: 14px;
}
input[type='range'] { width: 100%; accent-color: var(--violet); }
.row { display: flex; gap: 8px; }
.row .wide { flex: 1; }
.progress { margin-top: 12px; }
.bar { height: 6px; border-radius: 99px; background: var(--panel-2); overflow: hidden; }
#progress-fill { height: 100%; width: 0; background: var(--grad); transition: width 0.15s; }
#progress-text { margin-top: 6px; color: var(--muted); }
#model-note { margin: 10px 0 0; }
#model-note:empty { display: none; }

.bignum { display: flex; align-items: baseline; gap: 8px; }
.bignum span.empty { background: none; color: var(--faint); }
.bignum span { font: 600 40px/1 var(--mono); letter-spacing: -0.03em; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.bignum small { color: var(--muted); }
#spark { width: 100%; height: 56px; margin: 10px 0 6px; display: block; }
#spark[hidden] { display: none; }
.stats { display: grid; grid-template-columns: auto 1fr; gap: 4px 12px; margin: 8px 0 10px; font-size: 12.5px; }
.stats dt { color: var(--faint); }
.stats dd { margin: 0; text-align: right; color: #c9d1de; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ctxbar { height: 4px; border-radius: 99px; background: var(--panel-2); overflow: hidden; margin-bottom: 12px; }
#ctx-fill { height: 100%; width: 0; background: var(--cyan); }
#bench-out { white-space: pre-wrap; margin: 10px 0 0; color: #c9d1de; background: var(--bg-2); border: 1px solid var(--border); border-radius: 10px; padding: 10px; }

.pipeline { list-style: none; margin: 0; padding: 0; font-size: 12px; color: var(--muted); }
.pipeline li { display: grid; grid-template-columns: 88px 1fr; column-gap: 10px; align-items: baseline; padding: 3px 0; }
.pipeline span {
  color: var(--text); padding: 1px 7px; border-radius: 6px; background: var(--panel-2);
  border: 1px solid var(--border-2); text-align: center; white-space: nowrap;
}
.pipeline .loop { display: block; }
.pipeline .loop > span { display: inline-block; background: none; border: 0; color: var(--violet); padding-left: 0; }
.pipeline ol { list-style: none; margin: 4px 0 4px 6px; padding-left: 10px; border-left: 2px solid rgba(139, 92, 246, 0.45); }
.pipeline ol li { grid-template-columns: 78px 1fr; }
.how p { margin: 12px 0 0; }

.foot { text-align: center; padding: 10px 24px 18px; }

@media (max-width: 960px) {
  .layout { display: flex; flex-direction: column; align-items: stretch; padding: 14px 16px; gap: 14px; }
  .chat { height: 72vh; }
  .side { display: contents; }
  #model-card { order: -1; }
  .side > .card:not(#model-card) { order: 1; }
  .tagline { display: none; }
  .top { padding: 12px 16px; }
  .messages { padding: 18px 16px; }
}