@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Newsreader:opsz,wght@6..72,500;6..72,600&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --text: #1c1b1a;
  --muted: #6b6862;
  --line: #e9e6df;
  --accent: #4f46e5;
  --accent-soft: #eef0ff;
  --ai: #7c3aed;
  --ai-soft: #f4efff;
  --me: #0f8a5f;
  --me-soft: #e8f6ef;
  --bad: #c2410c;
  --bad-soft: #fff1e8;
  --code-bg: #f3f1ec;
  --pre-bg: #1d1c22;
  --pre-text: #e8e6f0;
  --shadow: 0 1px 2px rgba(20, 18, 12, .04), 0 4px 16px rgba(20, 18, 12, .05);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141317;
    --surface: #1c1b20;
    --text: #ecebf0;
    --muted: #a09ea8;
    --line: #2e2c34;
    --accent: #8b85ff;
    --accent-soft: #23213a;
    --ai: #b294ff;
    --ai-soft: #251d38;
    --me: #4cc79a;
    --me-soft: #15291f;
    --bad: #ff9b6a;
    --bad-soft: #2d1c14;
    --code-bg: #26242c;
    --pre-bg: #0e0d11;
    --pre-text: #e8e6f0;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 4px 16px rgba(0, 0, 0, .25);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.75 Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Noto Sans SC", sans-serif;
  -webkit-font-smoothing: antialiased;
}
main { max-width: 720px; margin: 0 auto; padding: 40px 20px 96px; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
p { margin: 0 0 1.1em; }
.muted { color: var(--muted); }
.small { font-size: .88rem; }

/* nav + header */
nav { display: flex; gap: 18px; margin-bottom: 56px; font-size: .92rem; }
nav a { color: var(--text); font-weight: 600; text-decoration: none; display: inline-flex; align-items: center; gap: 10px; }
nav a::before {
  content: "YT"; display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 50%;
  background: var(--text); color: var(--bg); font-size: .7rem; letter-spacing: .02em;
}
nav a:hover { color: var(--accent); }

h1, h2, h3 { font-family: Newsreader, Georgia, serif; font-weight: 600; letter-spacing: -.01em; }
h1 { font-size: clamp(2rem, 5.4vw, 2.75rem); line-height: 1.12; margin: 0 0 14px; }
h2 { font-size: 1.6rem; line-height: 1.25; margin: 2.6em 0 .7em; }
h3 { font-size: 1.22rem; margin: 1.8em 0 .4em; }
.kicker { font-size: .78rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); margin-bottom: 10px; }
.meta { color: var(--muted); font-size: .9rem; margin-bottom: 36px; }
.lead { font-size: 1.2rem; line-height: 1.6; }
.sec { display: block; font-family: Inter, sans-serif; font-size: .78rem; font-weight: 600; letter-spacing: .08em; color: var(--accent); margin-bottom: 4px; }

/* cards */
.answer {
  margin: 32px 0 8px; padding: 20px 24px; border-radius: 14px;
  background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
}
.answer .label { font-size: .75rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--accent); margin-bottom: 6px; }
.answer p { margin: .45em 0; }

.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 22px 0; }
@media (max-width: 640px) { .compare { grid-template-columns: 1fr; } }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 18px 20px; box-shadow: var(--shadow); }
.card p { margin: .4em 0; }
.card .label { display: inline-block; font-size: .72rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; padding: 2px 10px; border-radius: 999px; margin-bottom: 8px; }
.card.before .label { background: var(--bad-soft); color: var(--bad); }
.card.after .label { background: var(--me-soft); color: var(--me); }
.card.before p { font-family: "JetBrains Mono", ui-monospace, monospace; font-size: .86rem; line-height: 1.6; color: var(--muted); }

.insight {
  font-family: Newsreader, Georgia, serif; font-size: 1.45rem; line-height: 1.4; font-weight: 500;
  margin: 34px 0; padding: 4px 0 4px 22px; border-left: 3px solid var(--accent);
}

/* rule cards */
.rules { list-style: none; padding: 0; margin: 20px 0; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; counter-reset: r; }
@media (max-width: 640px) { .rules { grid-template-columns: 1fr; } }
.rules li { counter-increment: r; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px 14px 52px; position: relative; font-size: .95rem; line-height: 1.55; margin: 0; }
.rules li::before {
  content: counter(r); position: absolute; left: 16px; top: 14px; width: 24px; height: 24px; border-radius: 50%;
  display: grid; place-items: center; font-size: .78rem; font-weight: 700; background: var(--accent-soft); color: var(--accent);
}
.rules li b { display: block; margin-bottom: 2px; }
.rules li.wide { grid-column: 1 / -1; }

/* loop timeline */
.loop { list-style: none; padding: 0; margin: 26px 0; position: relative; }
.loop::before { content: ""; position: absolute; left: 17px; top: 8px; bottom: 8px; width: 2px; background: var(--line); }
.loop li { position: relative; padding: 0 0 22px 54px; margin: 0; }
.loop li:last-child { padding-bottom: 0; }
.loop .dot {
  position: absolute; left: 0; top: 0; width: 36px; height: 36px; border-radius: 50%;
  display: grid; place-items: center; font-weight: 700; font-size: .9rem; border: 2px solid var(--bg);
}
.loop .ai .dot { background: var(--ai-soft); color: var(--ai); box-shadow: 0 0 0 1px var(--ai); }
.loop .me .dot { background: var(--me-soft); color: var(--me); box-shadow: 0 0 0 1px var(--me); }
.loop .title { font-weight: 600; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; line-height: 36px; }
.loop .who { font-size: .7rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; padding: 1px 9px; border-radius: 999px; line-height: 1.7; }
.loop .ai .who { background: var(--ai-soft); color: var(--ai); }
.loop .me .who { background: var(--me-soft); color: var(--me); }
.loop .desc { color: var(--muted); font-size: .95rem; margin-top: 2px; line-height: 1.6; }
.loop .desc b { color: var(--text); font-weight: 600; }

/* story blocks */
.story { border: 1px solid var(--line); border-radius: 14px; padding: 6px 22px 10px; margin: 18px 0; background: var(--surface); box-shadow: var(--shadow); }
.story h3 { margin-top: .9em; }
.story .lesson { font-size: .92rem; color: var(--me); font-weight: 600; }

.terms { display: grid; gap: 10px; margin: 18px 0; }
.terms div { border-left: 3px solid var(--ai); padding: 2px 0 2px 14px; font-size: .95rem; }

/* tables, code */
table { border-collapse: separate; border-spacing: 0; width: 100%; margin: 1.2em 0; font-size: .93rem; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: var(--surface); }
th, td { padding: 10px 14px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
tr:last-child td { border-bottom: 0; }
th { font-size: .74rem; letter-spacing: .07em; text-transform: uppercase; color: var(--muted); background: var(--code-bg); font-weight: 600; }
code { font-family: "JetBrains Mono", ui-monospace, monospace; background: var(--code-bg); padding: 1px 6px; border-radius: 5px; font-size: .86em; }
pre { background: var(--pre-bg); color: var(--pre-text); padding: 16px 18px; border-radius: 12px; overflow-x: auto; font-size: .84rem; line-height: 1.6; }
pre code { background: none; padding: 0; color: inherit; }
blockquote { margin: 1.2em 0; padding: 2px 0 2px 18px; border-left: 3px solid var(--line); color: var(--muted); }
ol, ul { padding-left: 1.3em; }
li { margin: .3em 0; }

/* older draft components */
.sol { margin: 14px 0; padding: 12px 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.sol > .tag { display: inline-block; font-size: .72rem; font-weight: 700; padding: 1px 10px; border-radius: 999px; color: #fff; }
.sol.bad > .tag { background: var(--bad); }
.sol.good > .tag { background: #b7791f; }
.sol.great > .tag { background: var(--me); }
.flow { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin: 16px 0; font-size: .85rem; }
.flow .step { border: 1px solid var(--line); border-radius: 8px; padding: 6px 10px; text-align: center; background: var(--surface); }
.flow .step small { display: block; color: var(--muted); }
.flow .arrow { color: var(--muted); }
.who-code { border-left: 4px solid var(--me) !important; }
.who-model { border-left: 4px solid var(--ai) !important; }
.legend { font-size: .85rem; color: var(--muted); }
.legend span { display: inline-block; width: 12px; height: 12px; vertical-align: -1px; margin: 0 4px 0 10px; border-radius: 3px; }
.tree { border-left: 2px solid var(--line); margin: 12px 0 12px 8px; padding-left: 14px; font-size: .9rem; }
.tree p { margin: .35em 0; }
ul.posts { list-style: none; padding: 0; }
ul.posts li { padding: 14px 0; border-bottom: 1px solid var(--line); }
ul.posts .date { display: block; font-size: .85rem; color: var(--muted); }

footer { margin-top: 80px; padding-top: 20px; border-top: 1px solid var(--line); font-size: .88rem; color: var(--muted); }
footer a { color: var(--muted); }
table.mini { font-size: .88rem; margin: 10px 0; }
table.mini td { padding: 7px 12px; }
table.mini td:first-child { width: 110px; color: var(--muted); font-weight: 600; white-space: nowrap; }
table.mini tr:nth-child(3) td:first-child { color: var(--me); }
table.mini tr:nth-child(4) td:first-child { color: var(--bad); }
table.mini.cases td:first-child { width: auto; white-space: normal; color: var(--text); font-weight: 500; }
table.mini.cases tr td:first-child { color: var(--text) !important; }
ol.q7 { columns: 2; column-gap: 24px; font-size: .9rem; color: var(--text); margin: 10px 0 8px; padding-left: 1.4em; }
ol.q7 li { break-inside: avoid; margin: .2em 0; }
@media (max-width: 640px) { ol.q7 { columns: 1; } }
.rules li pre { margin: 8px 0 0; padding: 8px 10px; font-size: .78rem; }
.fixmap { display: grid; gap: 10px; margin: 20px 0; }
.fm-row { display: grid; grid-template-columns: minmax(0, 1fr) 28px minmax(0, 1.4fr); align-items: stretch; }
.fm-cause, .fm-fix { border-radius: 12px; padding: 12px 14px; font-size: .93rem; line-height: 1.5; }
.fm-cause { background: var(--bad-soft); color: var(--bad); font-weight: 600; display: flex; align-items: center; }
.fm-fix { background: var(--me-soft); border: 1px solid color-mix(in srgb, var(--me) 25%, transparent); }
.fm-fix b { display: block; color: var(--me); }
.fm-fix span { color: var(--text); }
.fm-arrow { display: grid; place-items: center; color: var(--muted); font-size: 1.1rem; }
@media (max-width: 640px) {
  .fm-row { grid-template-columns: 1fr; }
  .fm-arrow { transform: rotate(90deg); height: 22px; }
}
table.ba td:first-child { color: var(--muted); font-weight: 600; white-space: nowrap; }
table.ba td:nth-child(2) { color: var(--bad); }
table.ba td:nth-child(3) { color: var(--me); }
@media (max-width: 640px) { table.ba td:first-child { white-space: normal; } }