@font-face { font-family: "Instrument Serif"; src: url("../fonts/instrument-serif-latin.woff2") format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Instrument Serif"; src: url("../fonts/instrument-serif-italic-latin.woff2") format("woff2"); font-weight: 400; font-style: italic; font-display: swap; }
@font-face { font-family: "IBM Plex Mono"; src: url("../fonts/ibm-plex-mono-400-latin.woff2") format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "IBM Plex Mono"; src: url("../fonts/ibm-plex-mono-500-latin.woff2") format("woff2"); font-weight: 500; font-display: swap; }

:root {
  --paper: #f4efe6; --paper-2: #ebe4d8; --card: #fbf8f2; --ink: #161311; --ink-2: #3d3630; --muted: #77705f; --line: #d8cfc0; --line-2: #c4b9a6;
  --accent: #8a3b2a; --accent-ink: #fff5f0; --ok: #2e5a4b; --warn: #a2701f; --bad: #9b2d20;
  --serif: "Instrument Serif", "Songti TC", "Noto Serif CJK TC", "PMingLiU", Georgia, serif;
  --sans: -apple-system, "PingFang HK", "PingFang TC", "Microsoft JhengHei", "Noto Sans CJK TC", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --r: 10px; --shadow: 0 1px 0 rgba(22,19,17,.04), 0 10px 30px -18px rgba(22,19,17,.25);
}
* { box-sizing: border-box; }
html { background: var(--paper); color: var(--ink); font-family: var(--sans); font-size: 15px; line-height: 1.65; -webkit-font-smoothing: antialiased; }
body { margin: 0; min-height: 100vh; background: radial-gradient(1200px 600px at 10% -10%, #fff 0%, transparent 60%), var(--paper); }
a { color: inherit; }
button, input, select, textarea { font: inherit; color: inherit; }
::selection { background: #e4c9bf; }

.serif { font-family: var(--serif); font-weight: 400; letter-spacing: .005em; }
.mono { font-family: var(--mono); font-size: 12.5px; letter-spacing: .01em; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.hidden { display: none !important; }

/* top bar */
.topbar { display: flex; align-items: center; justify-content: space-between; padding: 14px 28px; border-bottom: 1px solid var(--line); background: rgba(244,239,230,.85); backdrop-filter: blur(8px); position: sticky; top: 0; z-index: 20; }
.brand { display: flex; align-items: baseline; gap: 12px; text-decoration: none; }
.brand .name { font-family: var(--serif); font-size: 26px; line-height: 1; }
.brand .sub { font-family: var(--mono); font-size: 11.5px; color: var(--muted); text-transform: uppercase; letter-spacing: .12em; }
.nav { display: flex; gap: 6px; align-items: center; }
.nav a, .nav button { padding: 7px 12px; border-radius: 999px; border: 1px solid transparent; background: transparent; cursor: pointer; text-decoration: none; font-size: 13.5px; }
.nav a:hover, .nav button:hover { border-color: var(--line-2); background: var(--card); }
.nav a.active { background: var(--ink); color: var(--paper); }

/* buttons */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 16px; border-radius: 999px; border: 1px solid var(--ink); background: var(--ink); color: var(--paper); cursor: pointer; font-size: 14px; transition: transform .08s ease, opacity .15s; }
.btn:hover { transform: translateY(-1px); }
.btn:disabled { opacity: .45; cursor: not-allowed; transform: none; }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line-2); }
.btn.ghost:hover { background: var(--card); }
.btn.accent { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.sm { padding: 6px 11px; font-size: 12.5px; }
.linkish { background: none; border: 0; padding: 0; color: var(--accent); cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }

/* forms */
label.f { display: block; margin: 12px 0 4px; font-size: 12.5px; color: var(--muted); letter-spacing: .02em; }
.in { width: 100%; padding: 10px 12px; border: 1px solid var(--line-2); border-radius: 8px; background: #fff; outline: none; }
.in:focus { border-color: var(--ink); box-shadow: 0 0 0 3px rgba(22,19,17,.06); }
textarea.in { min-height: 120px; resize: vertical; line-height: 1.6; }
.seg { display: inline-flex; border: 1px solid var(--line-2); border-radius: 999px; overflow: hidden; background: #fff; }
.seg button { padding: 7px 14px; border: 0; background: transparent; cursor: pointer; font-size: 13px; }
.seg button.on { background: var(--ink); color: var(--paper); }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.spread { justify-content: space-between; }

/* layout */
.wrap { max-width: 1440px; margin: 0 auto; padding: 22px 28px 60px; }
.grid { display: grid; grid-template-columns: 280px minmax(380px, 1fr) minmax(420px, 1.15fr); gap: 20px; align-items: start; }
@media (max-width: 1180px) { .grid { grid-template-columns: 1fr; } }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); box-shadow: var(--shadow); }
.card .hd { display: flex; align-items: center; justify-content: space-between; padding: 14px 18px; border-bottom: 1px solid var(--line); }
.card .hd h2 { margin: 0; font-family: var(--serif); font-size: 22px; font-weight: 400; }
.card .bd { padding: 18px; }
.kicker { font-family: var(--mono); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }
h1.display { font-family: var(--serif); font-weight: 400; font-size: clamp(38px, 6vw, 72px); line-height: 1.02; margin: 0 0 14px; letter-spacing: -.01em; }
h3.sec { font-family: var(--serif); font-weight: 400; font-size: 19px; margin: 22px 0 8px; }
hr.soft { border: 0; border-top: 1px solid var(--line); margin: 18px 0; }

/* channels */
.chan { padding: 12px 14px; border: 1px solid var(--line); border-radius: 8px; background: #fff; cursor: pointer; margin-bottom: 8px; transition: border-color .15s, transform .08s; }
.chan:hover { border-color: var(--line-2); transform: translateY(-1px); }
.chan.on { border-color: var(--ink); box-shadow: inset 0 0 0 1px var(--ink); }
.chan .n { font-family: var(--serif); font-size: 18px; }
.chan .p { color: var(--muted); font-size: 12.5px; margin-top: 2px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.tag { display: inline-block; padding: 2px 8px; border-radius: 999px; border: 1px solid var(--line-2); font-family: var(--mono); font-size: 11px; color: var(--ink-2); background: #fff; }
.tag.accent { border-color: var(--accent); color: var(--accent); }

/* steps */
.steps { display: grid; gap: 6px; margin: 12px 0; }
.step { display: flex; gap: 10px; align-items: center; padding: 8px 10px; border-radius: 8px; border: 1px dashed var(--line); font-size: 13px; color: var(--muted); }
.step .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--line-2); flex: none; }
.step.run { border-style: solid; color: var(--ink); }
.step.run .dot { background: var(--accent); animation: pulse 1s infinite ease-in-out; }
.step.ok { border-style: solid; color: var(--ink); }
.step.ok .dot { background: var(--ok); }
.step.err .dot { background: var(--bad); }
.step .t { font-family: var(--mono); margin-left: auto; font-size: 11px; }
@keyframes pulse { 0%,100% { opacity: .35; transform: scale(.85); } 50% { opacity: 1; transform: scale(1.15); } }

/* brief */
.qs { margin: 0; padding-left: 18px; }
.qs li { margin: 3px 0; }
table.facts { width: 100%; border-collapse: collapse; font-size: 13px; }
table.facts td { padding: 7px 8px; border-top: 1px solid var(--line); vertical-align: top; }
table.facts td.n { white-space: nowrap; font-family: var(--mono); font-size: 12px; color: var(--ink-2); }
table.facts a { color: var(--accent); text-decoration: none; font-family: var(--mono); font-size: 11.5px; }
.quote { border-left: 2px solid var(--line-2); padding: 4px 10px; margin: 6px 0; color: var(--ink-2); font-size: 13.5px; }
.beliefs { display: grid; gap: 10px; margin-top: 10px; }
.belief { border: 1px solid var(--line); border-radius: var(--r); padding: 14px 16px; background: #fff; cursor: pointer; position: relative; transition: border-color .15s, transform .08s; }
.belief:hover { transform: translateY(-1px); border-color: var(--line-2); }
.belief.on { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.belief .idx { position: absolute; top: 12px; right: 14px; font-family: var(--mono); font-size: 11px; color: var(--muted); }
.belief .b { font-family: var(--serif); font-size: 19px; line-height: 1.35; }
.belief .b::before { content: "「"; color: var(--muted); } .belief .b::after { content: "」"; color: var(--muted); }
.belief .r { margin-top: 6px; }
.belief .r b { color: var(--accent); font-weight: 600; }
.belief .m { margin-top: 8px; display: flex; gap: 6px; flex-wrap: wrap; }
.belief .w { margin-top: 8px; color: var(--muted); font-size: 12.5px; }

/* research convo */
.bubble { padding: 10px 12px; border-radius: 10px; margin: 6px 0; font-size: 13.5px; border: 1px solid var(--line); background: #fff; }
.bubble.flash { border-left: 3px solid var(--ink); }
.bubble.ds { border-left: 3px solid var(--accent); background: #fbf4f1; }
.bubble ol, .bubble ul { margin: 6px 0 0; padding-left: 18px; }
.bubble li { margin: 2px 0; }

/* output */
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); padding: 0 18px; }
.tabs button { padding: 10px 12px; border: 0; background: transparent; cursor: pointer; border-bottom: 2px solid transparent; margin-bottom: -1px; color: var(--muted); }
.tabs button.on { color: var(--ink); border-bottom-color: var(--ink); }
.script { white-space: pre-wrap; font-size: 15.5px; line-height: 1.9; padding: 6px 2px; }
.script p { margin: 0 0 14px; }
.script p:first-child { font-family: var(--serif); font-size: 21px; line-height: 1.45; }
.script p:last-child { font-family: var(--serif); font-size: 18px; border-top: 1px solid var(--line); padding-top: 12px; }
.chips { display: flex; gap: 6px; flex-wrap: wrap; margin: 6px 0 12px; }
.chip { font-family: var(--mono); font-size: 11.5px; padding: 4px 9px; border-radius: 6px; border: 1px solid var(--line); background: #fff; }
.chip.ok { border-color: #b9d3c8; background: #eef6f2; color: var(--ok); }
.chip.bad { border-color: #e6c2bb; background: #fbeeea; color: var(--bad); }
details.slots summary { cursor: pointer; color: var(--muted); font-size: 13px; }
table.slots { width: 100%; font-size: 13px; border-collapse: collapse; margin-top: 8px; }
table.slots td { padding: 6px 8px; border-top: 1px solid var(--line); vertical-align: top; }
table.slots td:first-child { width: 96px; color: var(--muted); font-family: var(--mono); font-size: 11.5px; }
.caption { white-space: pre-wrap; background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 12px 14px; font-size: 13.5px; }
.empty { padding: 40px 18px; text-align: center; color: var(--muted); }
.empty .big { font-family: var(--serif); font-size: 28px; color: var(--ink-2); margin-bottom: 6px; }

/* toast */
.toast { position: fixed; left: 50%; bottom: 26px; transform: translateX(-50%); background: var(--ink); color: var(--paper); padding: 10px 16px; border-radius: 999px; font-size: 13.5px; box-shadow: var(--shadow); z-index: 50; opacity: 0; transition: opacity .2s; pointer-events: none; }
.toast.show { opacity: 1; }

/* landing */
.hero { display: grid; grid-template-columns: 1.2fr .8fr; gap: 40px; align-items: center; min-height: calc(100vh - 70px); padding: 40px 0; }
@media (max-width: 900px) { .hero { grid-template-columns: 1fr; } }
.hero .lead { font-size: 17px; color: var(--ink-2); max-width: 560px; }
.flow { display: grid; grid-template-columns: repeat(7, 1fr); gap: 6px; margin-top: 28px; }
.flow div { border-top: 1px solid var(--line-2); padding-top: 8px; font-size: 12.5px; color: var(--muted); }
.flow div b { display: block; font-family: var(--mono); font-size: 11px; color: var(--ink); margin-bottom: 2px; }
.auth { padding: 26px 26px 22px; }
.auth h2 { margin: 0 0 4px; font-family: var(--serif); font-size: 30px; font-weight: 400; }
.err { color: var(--bad); font-size: 13px; margin-top: 8px; min-height: 18px; }

/* history */
.runs { display: grid; gap: 8px; }
.run { display: grid; grid-template-columns: 1fr auto; gap: 10px; padding: 12px 14px; border: 1px solid var(--line); border-radius: 8px; background: #fff; cursor: pointer; }
.run:hover { border-color: var(--line-2); }
.run .t { font-family: var(--serif); font-size: 17px; }
.run .meta { color: var(--muted); font-size: 12px; font-family: var(--mono); }