@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,500;0,600;0,700;1,500&family=IBM+Plex+Mono:wght@400;500&family=IBM+Plex+Sans:wght@400;500;600&family=Noto+Sans+SC:wght@400;500;700&family=Noto+Serif+SC:wght@500;700&display=swap');

:root {
  --paper: #f3eee4;
  --paper-2: #e8e1d2;
  --panel: #fbf8f1;
  --ink: #2f362f;
  --ink-soft: #5d665c;
  --moss: #4d6b55;
  --moss-2: #6e8b74;
  --celadon: #d5e2d6;
  --seal: #b5523a;
  --line: rgba(47, 54, 47, 0.12);
  --line-strong: rgba(47, 54, 47, 0.22);
  --serif: "Cormorant Garamond", "Noto Serif SC", serif;
  --sans: "IBM Plex Sans", "Noto Sans SC", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background:
    radial-gradient(1100px 520px at 8% -8%, #e4eee6 0%, transparent 58%),
    radial-gradient(900px 480px at 100% 0%, #f2e6d6 0%, transparent 52%),
    var(--paper);
}
a { color: inherit; }

.grain {
  pointer-events: none;
  position: fixed;
  inset: 0;
  opacity: 0.07;
  z-index: 8;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='.55'/%3E%3C/svg%3E");
}

.gate-body, .fill-body { min-height: 100vh; }
.gate-top, .gate-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px 36px;
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  font-family: var(--serif);
  font-size: 22px;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--ink);
}
.brand img { width: 34px; height: 34px; object-fit: contain; }

.gate-split {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  padding: 12px 64px 64px;
  align-items: center;
}
.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--moss);
  margin: 0 0 16px;
}
.gate-left h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(64px, 9vw, 128px);
  line-height: 0.85;
  margin: 0 0 24px;
  display: flex;
  align-items: baseline;
  gap: 18px;
  color: var(--ink);
}
.gate-left h1 .num { color: var(--moss); }
.gate-left h1 .arrow { color: var(--seal); font-size: 0.55em; }
.lede {
  max-width: 38em;
  font-size: 18px;
  line-height: 1.7;
  color: var(--ink-soft);
}
.ledger {
  list-style: none;
  padding: 0;
  margin: 32px 0;
  border-top: 1px solid var(--line);
}
.ledger li {
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
}
.ledger b { font-family: var(--serif); font-size: 20px; margin-right: 10px; color: var(--moss); }
.fine { font-size: 13px; color: var(--ink-soft); }

.card {
  background: var(--panel);
  color: var(--ink);
  border-radius: 4px;
  padding: 28px;
  border: 1px solid var(--line);
  box-shadow: 0 18px 40px rgba(77, 107, 85, 0.08);
  position: relative;
}
.card:before {
  content: "";
  position: absolute;
  top: -10px;
  right: 28px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #d9785c, var(--seal) 62%, #7a2e1c);
  box-shadow: 0 8px 16px rgba(181, 82, 58, 0.22);
}
.tabs { display: flex; gap: 8px; margin-bottom: 18px; }
.tab {
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 8px 12px;
  cursor: pointer;
}
.tab.on { background: var(--moss); color: var(--panel); border-color: var(--moss); }
.auth-form label, .fill-wrap label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  margin-bottom: 14px;
  color: var(--ink-soft);
}
.auth-form input, .fill-wrap input, .fill-wrap select, .fill-wrap textarea, .composer textarea {
  font: 16px var(--sans);
  border: none;
  border-bottom: 1px solid var(--line-strong);
  background: transparent;
  padding: 8px 0;
  outline: none;
  color: var(--ink);
}
.hint { font-size: 12px; color: var(--ink-soft); }
.wax {
  margin-top: 8px;
  width: 100%;
  border: 0;
  background: var(--moss);
  color: #f7f4ea;
  font-family: var(--serif);
  font-size: 22px;
  padding: 12px 16px;
  cursor: pointer;
}
.wax:hover { background: #3f5c46; }
.wax:disabled {
  opacity: 0.55;
  cursor: wait;
}
.hidden { display: none; }
.auth-msg { min-height: 1.4em; color: var(--seal); font-size: 14px; }

.os-body {
  display: grid;
  grid-template-columns: 220px 240px 1fr 280px;
  min-height: 100vh;
}
.rail, .sessions, .artifacts {
  border-right: 1px solid var(--line);
  padding: 20px 16px;
  position: relative;
  z-index: 2;
  background: rgba(251, 248, 241, 0.55);
}
.artifacts { border-right: 0; border-left: 1px solid var(--line); }
.rail .brand strong { display: block; font-family: var(--serif); font-size: 20px; }
.rail .brand em { font-style: normal; font-size: 11px; letter-spacing: 0.16em; color: var(--moss); }
.bays { margin-top: 28px; display: flex; flex-direction: column; gap: 8px; }
.bay {
  display: block;
  text-decoration: none;
  padding: 12px 10px;
  border: 1px solid transparent;
  font-size: 14px;
  color: var(--ink);
}
.bay.on, .bay:hover {
  border-color: var(--celadon);
  background: rgba(213, 226, 214, 0.55);
}
.bay small { display: block; color: var(--ink-soft); font-size: 11px; margin-top: 4px; }
.rail-foot { position: absolute; bottom: 18px; left: 16px; right: 16px; font-size: 12px; color: var(--ink-soft); }
.rail-foot button, .sessions button, .upload-btn {
  margin-top: 8px;
  width: 100%;
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line-strong);
  padding: 8px;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.rail-foot button:hover, .sessions button:hover, .upload-btn:hover {
  background: var(--celadon);
  border-color: var(--moss-2);
}
.sessions header, .nb-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.sessions h2, .artifacts h2 { font-family: var(--serif); font-weight: 600; font-size: 22px; margin: 0 0 12px; }
#session-list { list-style: none; padding: 0; margin: 16px 0 0; }
#session-list li {
  padding: 10px 8px;
  border-bottom: 1px solid var(--line);
  cursor: pointer;
  font-size: 13px;
  color: var(--ink-soft);
}
#session-list li.on {
  background: rgba(213, 226, 214, 0.65);
  color: var(--ink);
}

.notebook {
  display: flex;
  flex-direction: column;
  min-width: 0;
  position: relative;
  z-index: 2;
  background: var(--panel);
}
.nb-head { padding: 18px 24px 8px; align-items: flex-start; }
.nb-head-main { min-width: 0; }
.nb-head h1 { font-family: var(--serif); font-size: 32px; margin: 0; }
.upload-btn { width: auto; position: relative; overflow: hidden; }
.upload-btn input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }

.run-meter {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}
.run-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--moss-2);
  box-shadow: 0 0 0 3px rgba(77, 107, 85, 0.12);
}
.run-meter.live .run-dot {
  background: var(--moss);
  animation: pulse 1.2s ease-in-out infinite;
}
.run-meter.done .run-dot { background: var(--moss-2); }
.run-meter.err .run-dot { background: var(--seal); }
@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.35); opacity: 0.55; }
}

.stream {
  flex: 1;
  overflow: auto;
  padding: 8px 24px 24px;
}
.bubble {
  margin: 18px 0;
  max-width: 760px;
}
.bubble.user .body {
  background: var(--celadon);
  color: var(--ink);
  padding: 14px 16px;
  border-radius: 2px 14px 14px 2px;
}
.bubble.assistant .body {
  border-left: 2px solid var(--moss);
  padding: 4px 0 4px 14px;
  line-height: 1.7;
  color: var(--ink);
}
.md > *:first-child { margin-top: 0; }
.md > *:last-child { margin-bottom: 0; }
.md h1, .md h2, .md h3, .md h4 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.25;
  margin: 1.1em 0 0.45em;
  color: var(--ink);
}
.md h1 { font-size: 1.55em; }
.md h2 { font-size: 1.28em; }
.md h3 { font-size: 1.12em; }
.md h4 { font-size: 1.02em; }
.md p { margin: 0.65em 0; }
.md ul, .md ol { margin: 0.45em 0 0.7em; padding-left: 1.4em; }
.md li { margin: 0.2em 0; }
.md li > ul, .md li > ol { margin: 0.15em 0; }
.md hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 1em 0;
}
.md blockquote {
  margin: 0.7em 0;
  padding: 0.2em 0 0.2em 12px;
  border-left: 3px solid var(--celadon);
  color: var(--ink-soft);
}
.md code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: rgba(77, 107, 85, 0.08);
  padding: 0.12em 0.35em;
  border-radius: 3px;
}
.md pre {
  margin: 0.7em 0;
  padding: 12px 14px;
  background: #f3efe4;
  border: 1px solid var(--line);
  overflow: auto;
  border-radius: 3px;
}
.md pre code {
  background: none;
  padding: 0;
  font-size: 12px;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
}
.md a { color: var(--moss); text-decoration: underline; text-underline-offset: 2px; }
.md img { max-width: 100%; border: 1px solid var(--line); }
.md table {
  border-collapse: collapse;
  width: 100%;
  margin: 0.8em 0;
  font-size: 13px;
}
.md {
  overflow-x: auto;
}
.md th, .md td {
  border: 1px solid var(--line-strong);
  padding: 6px 10px;
  text-align: left;
  vertical-align: top;
}
.md th {
  background: var(--celadon);
  font-weight: 600;
}
.md tr:nth-child(even) td { background: rgba(213, 226, 214, 0.28); }
.md del { color: var(--ink-soft); }

.step-mark {
  margin: 16px 0 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--moss);
}
.think-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 12px 0;
  color: var(--ink-soft);
  font-size: 14px;
}
.think-row .run-dot { animation: pulse 1.2s ease-in-out infinite; }

.trace {
  font-family: var(--sans);
  font-size: 13px;
  border: 1px solid var(--line);
  background: #f7f4ea;
  padding: 12px 14px;
  margin: 10px 0;
  border-left: 3px solid var(--moss-2);
}
.trace.running { border-left-color: var(--moss); background: #eef4ee; }
.trace.ok { border-left-color: var(--moss); }
.trace.err { border-left-color: var(--seal); background: #f8eee9; }
.trace-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
}
.trace-head b { font-family: var(--serif); font-size: 16px; font-weight: 600; }
.trace-head code {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-soft);
}
.trace-state {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--moss);
}
.trace.running .trace-state { color: var(--moss); }
.trace.err .trace-state { color: var(--seal); }
.trace-brief {
  margin: 8px 0 0;
  color: var(--ink-soft);
  line-height: 1.5;
}
.trace details {
  margin-top: 8px;
  color: var(--ink-soft);
}
.trace summary {
  cursor: pointer;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.trace pre {
  margin: 8px 0 0;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.45;
  max-height: 240px;
  overflow: auto;
  background: rgba(255,255,255,.55);
  padding: 8px;
}

.composer {
  display: grid;
  grid-template-columns: 1fr 88px 88px;
  gap: 12px;
  padding: 16px 24px 24px;
  border-top: 1px solid var(--line);
  background: var(--panel);
}
.composer textarea {
  color: var(--ink);
  border-bottom-color: var(--line-strong);
  resize: none;
}
.composer .wax { width: auto; margin: 0; }
.stop-btn {
  margin: 0;
  border: 1px solid var(--seal);
  background: transparent;
  color: var(--seal);
  font-family: var(--serif);
  font-size: 20px;
  padding: 12px 10px;
  cursor: pointer;
}
.stop-btn:hover { background: #f8eee9; }
.abort-note {
  margin: 12px 0;
  padding: 10px 12px;
  border-left: 3px solid var(--seal);
  background: #f8eee9;
  color: var(--ink);
  font-size: 14px;
}
.artifact-list img { max-width: 100%; border: 1px solid var(--line); }
.artifact-list a { color: var(--moss); font-size: 13px; display: block; margin: 8px 0; }
.fill-wrap { max-width: 720px; margin: 0 auto; padding: 24px; }
.fill-wrap h1 { font-family: var(--serif); }
.fill-wrap .wax { width: auto; padding: 10px 28px; }

@media (max-width: 1100px) {
  .os-body { grid-template-columns: 1fr; }
  .rail, .sessions, .artifacts { border-right: 0; border-bottom: 1px solid var(--line); }
  .artifacts { border-left: 0; }
  .rail-foot { position: static; }
  .gate-split { grid-template-columns: 1fr; padding: 16px; }
  .gate-left h1 { font-size: 72px; }
}