:root {
    --paper: #F6F6F3; --panel: #FFFFFF; --paper-2: #EEEFEA; --paper-3: #E2E4DE;
    --ink: #1C2321; --ink-2: #4A5652; --ink-3: #7B8783; --rule: #D5D9D2;
    --accent: #137A6E; --accent-soft: #DCEEEA; --source: #B8322B; --source-soft: #F7E3E1;
    --note: #B7791F; --note-soft: #F6ECD6;
    --display: "Fraunces", Georgia, serif; --sans: "IBM Plex Sans", "Helvetica Neue", Arial, sans-serif; --mono: "IBM Plex Mono", Menlo, monospace;
  }
  @media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) {
    --paper: #131715; --panel: #1A1F1D; --paper-2: #222826; --paper-3: #2C3330;
    --ink: #E7EBE8; --ink-2: #B4BDB8; --ink-3: #7F8985; --rule: #313834;
    --accent: #4FB8A9; --accent-soft: #17302C; --source: #E06A63; --source-soft: #3A2220; --note: #D9A24A; --note-soft: #33291A; } }
  :root[data-theme="dark"] {
    --paper: #131715; --panel: #1A1F1D; --paper-2: #222826; --paper-3: #2C3330;
    --ink: #E7EBE8; --ink-2: #B4BDB8; --ink-3: #7F8985; --rule: #313834;
    --accent: #4FB8A9; --accent-soft: #17302C; --source: #E06A63; --source-soft: #3A2220; --note: #D9A24A; --note-soft: #33291A; }

  * { box-sizing: border-box; }
  body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); font-size: 14px; line-height: 1.5; padding-inline: 16px; padding-block: 0 24px; -webkit-font-smoothing: antialiased; }
  a { color: inherit; }
  h1, h2, h3 { margin: 0; font-family: var(--display); font-weight: 500; line-height: 1.15; text-wrap: balance; }
  button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; padding: 0; }
  button:focus-visible, input:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

  .topbar { display: flex; align-items: center; gap: 14px; padding-block: 12px; border-bottom: 1px solid var(--rule); font-size: 13px; color: var(--ink-2); flex-wrap: wrap; }
  .topbar .brand { font-weight: 600; letter-spacing: .04em; color: var(--ink); }
  .topbar .crumb b { color: var(--ink); font-weight: 500; }
  .topbar .spacer { flex: 1; }
  .badge { font-size: 11px; letter-spacing: .04em; padding: 3px 8px; border-radius: 3px; background: var(--accent-soft); color: var(--accent); font-weight: 600; }
  .badge.mock { background: var(--note-soft); color: var(--note); }

  .app { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 16px; padding-top: 16px; min-height: calc(100vh - 80px); transition: padding-right .25s ease; }
  body.chat-open .app { padding-right: 336px; }
  .nav, .chat { background: var(--panel); border: 1px solid var(--rule); border-radius: 8px; display: flex; flex-direction: column; min-height: 0; }
  .nav { position: sticky; top: 16px; max-height: calc(100vh - 32px); }
  .chat { position: fixed; top: 16px; right: 16px; bottom: 16px; width: 320px; z-index: 20; transform: translateX(calc(100% + 32px)); transition: transform .25s ease; box-shadow: 0 8px 30px -12px rgba(0,0,0,.25); }
  body.chat-open .chat { transform: none; }
  .chat-tab { position: fixed; right: 0; top: 50%; transform: translateY(-50%) rotate(180deg); writing-mode: vertical-rl; z-index: 19; background: var(--accent); color: #fff; padding: 12px 8px; border-radius: 0 6px 6px 0; font-weight: 600; letter-spacing: .06em; font-size: 12px; box-shadow: 0 4px 14px -4px rgba(0,0,0,.3); }
  body.chat-open .chat-tab { display: none; }
  .chat .hd { display: flex; align-items: flex-start; gap: 8px; }
  .chat .hd > div { flex: 1; }
  .chat .close { color: var(--ink-3); font-size: 18px; line-height: 1; padding: 2px 4px; border-radius: 4px; }
  .chat .close:hover { background: var(--paper-2); color: var(--ink); }
  .topbar .askbtn { border: 1px solid var(--rule); border-radius: 6px; padding: 4px 10px; font-weight: 500; color: var(--accent); }
  .topbar .askbtn:hover { border-color: var(--accent); }

  /* nav */
  .ch { padding: 16px 16px 12px; border-bottom: 1px solid var(--rule); }
  .ch .name { font-family: var(--display); font-size: 20px; font-weight: 500; }
  .ch .meta { font-size: 12px; color: var(--ink-3); margin-top: 3px; }
  .ch .cover { margin-top: 10px; height: 4px; border-radius: 2px; background: var(--paper-3); overflow: hidden; }
  .ch .cover i { display: block; height: 100%; width: 34%; background: var(--accent); }
  .ch .coverlbl { font-size: 11px; color: var(--ink-3); margin-top: 5px; }
  .search { margin: 12px 12px 6px; display: flex; align-items: center; gap: 8px; border: 1px solid var(--rule); border-radius: 6px; padding: 7px 10px; background: var(--paper); }
  .search input { flex: 1; border: 0; background: none; font: inherit; color: var(--ink); outline: none; min-width: 0; }
  .search input::placeholder { color: var(--ink-3); }
  .navlist { overflow-y: auto; padding: 4px 8px 12px; }
  .navlist .home { display: block; width: 100%; text-align: left; padding: 7px 8px; border-radius: 5px; font-weight: 500; }
  .navlist .home.on, .navlist .r.on { background: var(--accent-soft); color: var(--accent); }
  .navlist .cat { display: flex; justify-content: space-between; align-items: baseline; padding: 12px 8px 4px; font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); }
  .navlist .r { display: block; width: 100%; text-align: left; padding: 5px 8px; border-radius: 5px; color: var(--ink-2); line-height: 1.3; font-size: 13px; }
  .navlist .r:hover { background: var(--paper-2); color: var(--ink); }
  .navlist .r .src { font-family: var(--mono); font-size: 10px; color: var(--ink-3); margin-left: 4px; }

  /* content */
  .content { min-width: 0; }
  .card { background: var(--panel); border: 1px solid var(--rule); border-radius: 8px; padding: 28px 32px 32px; }
  .front .intro { font-family: var(--display); font-size: 17px; line-height: 1.5; color: var(--ink-2); max-width: 62ch; margin-top: 10px; font-weight: 400; }
  .front h1 { font-size: 34px; }
  .front .eyebrow { font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 8px; }
  .front h2 { font-size: 19px; margin-top: 28px; padding-bottom: 6px; border-bottom: 1px solid var(--rule); }
  .starts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 12px; }
  .start { text-align: left; border: 1px solid var(--rule); border-radius: 6px; padding: 12px 14px; background: var(--paper); display: flex; flex-direction: column; gap: 4px; }
  .start:hover { border-color: var(--accent); }
  .start b { font-family: var(--display); font-weight: 500; font-size: 15px; }
  .start span { font-size: 12px; color: var(--ink-2); }
  .habits { margin: 12px 0 0; padding: 0; list-style: none; display: grid; gap: 8px; }
  .habits li { display: flex; gap: 10px; align-items: baseline; }
  .habits .n { font-family: var(--mono); font-size: 11px; color: var(--accent); min-width: 22px; }
  .habits .cites { margin-left: auto; white-space: nowrap; }
  .yt { font-family: var(--mono); font-size: 11px; color: var(--source); text-decoration: none; padding: 1px 5px; border-radius: 3px; background: var(--source-soft); white-space: nowrap; }
  .yt:hover { text-decoration: underline; }
  .catgrid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 12px; }
  .catbox { border: 1px solid var(--rule); border-radius: 6px; padding: 12px 14px; }
  .catbox h3 { font-size: 16px; display: flex; justify-content: space-between; }
  .catbox h3 span { font-family: var(--mono); font-size: 11px; color: var(--ink-3); font-weight: 400; }
  .catbox ul { margin: 8px 0 0; padding: 0; list-style: none; font-size: 13px; color: var(--ink-2); }
  .catbox li button { text-align: left; padding: 2px 0; }
  .catbox li button:hover { color: var(--accent); }
  .catbox .more { font-size: 12px; color: var(--ink-3); margin-top: 4px; }

  .recipe .eyebrow { display: flex; gap: 10px; align-items: center; font-size: 12px; color: var(--ink-3); flex-wrap: wrap; }
  .recipe h1 { font-size: 32px; margin-top: 6px; }
  .recipe .summary { font-family: var(--display); font-style: italic; font-size: 16px; color: var(--ink-2); margin-top: 8px; max-width: 60ch; }
  .timings { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
  .timing { border: 1px solid var(--rule); border-radius: 5px; padding: 6px 10px; font-size: 12.5px; background: var(--paper); }
  .timing b { font-weight: 600; text-transform: capitalize; }
  .cols { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 32px; margin-top: 24px; }
  .recipe h2 { font-size: 17px; padding-bottom: 6px; border-bottom: 1px solid var(--rule); margin-bottom: 10px; }
  .ing { margin: 0; padding: 0; list-style: none; display: grid; gap: 6px; font-size: 13.5px; }
  .ing li { display: grid; grid-template-columns: auto 1fr; gap: 8px; }
  .ing .amt { font-family: var(--mono); font-size: 12px; color: var(--ink-2); white-space: nowrap; }
  .steps { margin: 0; padding: 0; list-style: none; counter-reset: s; display: grid; gap: 12px; font-size: 14px; }
  .steps li { display: grid; grid-template-columns: 26px 1fr auto; gap: 10px; align-items: baseline; counter-increment: s; }
  .steps li > span { line-height: 1.5; }
  .steps li::before { content: counter(s); font-family: var(--mono); font-size: 11px; color: var(--ink-3); }
  .steps li.chap::before { content: "▸"; }
  .notes { margin-top: 22px; border-left: 3px solid var(--note); background: var(--note-soft); border-radius: 0 6px 6px 0; padding: 12px 16px; }
  .notes h2 { border: 0; margin-bottom: 6px; padding: 0; }
  .notes ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 6px; font-size: 13.5px; }
  .notes li { display: flex; gap: 8px; align-items: baseline; justify-content: space-between; }
  .cross { margin-top: 14px; border-left: 3px solid var(--source); background: var(--source-soft); border-radius: 0 6px 6px 0; padding: 12px 16px; font-size: 13.5px; }
  .cross b { display: block; margin-bottom: 3px; }
  .chapnote { font-size: 12.5px; color: var(--ink-3); margin-top: 8px; }

  /* chat */
  .chat .hd { padding: 14px 16px; border-bottom: 1px solid var(--rule); }
  .chat .hd b { font-weight: 600; }
  .chat .hd span { display: block; font-size: 12px; color: var(--ink-3); margin-top: 2px; }
  .thread { flex: 1; overflow-y: auto; padding: 14px 16px; display: flex; flex-direction: column; gap: 12px; }
  .msg { max-width: 92%; font-size: 13.5px; line-height: 1.45; }
  .msg.q { align-self: flex-end; background: var(--accent-soft); color: var(--ink); padding: 8px 12px; border-radius: 10px 10px 2px 10px; }
  .msg.a { align-self: flex-start; background: var(--paper-2); padding: 10px 12px; border-radius: 10px 10px 10px 2px; }
  .msg.a .cites { margin-top: 6px; display: flex; gap: 6px; flex-wrap: wrap; }
  .msg.a .open { display: inline-block; margin-top: 6px; color: var(--accent); font-weight: 500; }
  .chat form { display: flex; gap: 8px; padding: 12px; border-top: 1px solid var(--rule); }
  .chat input { flex: 1; border: 1px solid var(--rule); border-radius: 6px; padding: 8px 10px; background: var(--paper); font: inherit; color: var(--ink); min-width: 0; }
  .chat .send { background: var(--accent); color: #fff; border-radius: 6px; padding: 0 12px; font-weight: 500; }
  .sugg { display: flex; gap: 6px; flex-wrap: wrap; padding: 0 12px 10px; }
  .sugg button { font-size: 12px; border: 1px solid var(--rule); border-radius: 12px; padding: 3px 9px; color: var(--ink-2); background: var(--paper); }
  .sugg button:hover { border-color: var(--accent); color: var(--accent); }

  @media (max-width: 1100px) { .app { grid-template-columns: 220px minmax(0, 1fr); } body.chat-open .app { padding-right: 0; } }
  @media (max-width: 760px) { .chat { width: min(92vw, 360px); right: 8px; top: 8px; bottom: 8px; } .app { grid-template-columns: 1fr; } .nav { position: static; max-height: none; } .navlist { max-height: 260px; } .cols, .starts, .catgrid { grid-template-columns: 1fr; } .card { padding: 20px 18px; } }
  @media (prefers-reduced-motion: reduce) { .chat, .app { transition: none; } }
  @media (prefers-reduced-motion: no-preference) { .start, .navlist .r { transition: background .12s, border-color .12s; } }

  /* app additions */
  .paste { max-width: 560px; margin: 48px auto; text-align: center; }
  .paste h1 { font-size: 34px; }
  .paste p { color: var(--ink-2); margin-top: 10px; }
  .paste form { display: flex; gap: 8px; margin-top: 22px; }
  .paste input { flex: 1; border: 1px solid var(--rule); border-radius: 6px; padding: 12px 14px; font: inherit; background: var(--panel); color: var(--ink); }
  .paste button { background: var(--accent); color: #fff; border-radius: 6px; padding: 0 18px; font-weight: 500; }
  .shelfgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; margin-top: 28px; }
  .prog { max-width: 620px; margin: 48px auto; }
  .prog h1 { font-size: 28px; }
  .prog .bar { height: 6px; margin: 16px 0; }
  .prog ul { list-style: none; padding: 0; margin: 12px 0 0; font-family: var(--mono); font-size: 12px; color: var(--ink-2); }
  .prog li { padding: 3px 0; border-bottom: 1px dashed var(--rule); }
  .prog .err { white-space: pre-wrap; font-family: var(--mono); font-size: 12px; color: var(--source); }
  .msg.a .yt { margin-right: 4px; }

  .ing li.grp { margin-top: 8px; font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); }
  .ing small { display: block; color: var(--ink-3); font-size: 11px; }
  .sugg { padding-top: 6px; }

  /* embedded player with a click-to-load facade */
  .player { position: relative; margin: 14px 0 6px; max-width: 720px; aspect-ratio: 16/9; background: #000; border-radius: 8px; overflow: hidden; scroll-margin-top: 16px; }
  .player .facade { position: absolute; inset: 0; width: 100%; padding: 0; cursor: pointer; }
  .player .facade img { width: 100%; height: 100%; object-fit: cover; display: block; opacity: .85; }
  .player .playbtn { position: absolute; left: 50%; top: 50%; transform: translate(-50%,-50%); width: 64px; height: 64px; border-radius: 50%; background: rgba(0,0,0,.7); color: #fff; font-size: 26px; display: grid; place-items: center; padding-left: 4px; }
  .player .facade:hover .playbtn { background: var(--source); }
  .player .dur { position: absolute; left: 12px; bottom: 10px; color: #fff; font-family: var(--mono); font-size: 12px; background: rgba(0,0,0,.6); padding: 3px 8px; border-radius: 4px; }
  .player #player, .player iframe { position: absolute; inset: 0; width: 100%; height: 100%; }
  .recipe .eyebrow .yt { margin-left: 4px; }

  .typing { display:inline-block; animation: blink 1s infinite; } @keyframes blink { 50% { opacity:.3 } }
  @media (prefers-reduced-motion: reduce) { .typing { animation: none } }