/* ===================================================================
   The Sandbox Shift — "Containment, a field manual"
   Refined editorial / engineering-datasheet aesthetic.
   Bone paper · ink · vermillion · hairline rules · mono labels.
   =================================================================== */

:root {
  --paper:   #efe7d6;   /* warm bone */
  --paper-2: #e7dec9;   /* inset / alt */
  --ink:     #1b1813;
  --ink-2:   #574f3e;   /* muted — darkened for AA contrast on bone */
  --hot:     #e5421f;   /* vermillion (decorative / large only) */
  --hot-2:   #a62c0b;   /* darker vermillion for small text & labels (AA) */
  --rule:    rgba(27,24,19,.18);
  --rule-2:  rgba(27,24,19,.34);

  --display: "Bricolage Grotesque", system-ui, sans-serif;
  --body:    "Newsreader", Georgia, "Times New Roman", serif;
  --mono:    "IBM Plex Mono", ui-monospace, monospace;

  --cw: 66rem;
  --pad: clamp(1.25rem, calc((100% - var(--cw)) / 2), 50%);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: clamp(1.02rem, 1.4vw, 1.18rem);
  line-height: 1.62;
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  /* faint paper grain */
  background-image:
    radial-gradient(circle at 18% 12%, rgba(229,66,31,.05), transparent 38%),
    radial-gradient(circle at 88% 78%, rgba(27,24,19,.04), transparent 42%);
}

a { color: var(--hot-2); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--ink); }

code { font-family: var(--mono); font-size: .82em; background: rgba(27,24,19,.07);
       padding: .08em .35em; border-radius: 2px; }
em { font-style: italic; }
strong, b { font-weight: 600; }

.skip { position:absolute; left:-999px; }
.skip:focus { left:1rem; top:1rem; background:var(--ink); color:var(--paper);
              padding:.5rem 1rem; z-index:9; }

/* shared mono micro-label */
.mk {
  display: inline-block;
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--hot-2);
  margin-right: .6rem;
}
.mk.hot { color: var(--hot-2); }

/* visible keyboard focus everywhere */
:focus-visible { outline: 2px solid var(--hot); outline-offset: 2px; border-radius: 1px; }
.d-out :focus-visible, .foot :focus-visible { outline-color: #ff7a5c; }

/* ---------- layout primitives ---------- */
.mast, .sec, .foot, .strip { padding-inline: var(--pad); }
.sec  { padding-block: clamp(3rem, 6vw, 5rem); }
.sec.alt { background: var(--paper-2); border-block: 1px solid var(--rule); }
.lead { max-width: 58ch; color: var(--ink-2); font-size: 1.05em; }

/* ============ MASTHEAD ============ */
.mast { padding-top: clamp(1.5rem, 4vw, 3rem); padding-bottom: clamp(2.5rem, 5vw, 4rem); }
.rule-top {
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  font-family: var(--mono); font-size: .66rem; letter-spacing: .22em; text-transform: uppercase;
  color: var(--ink-2); border-bottom: 1px solid var(--rule-2);
  padding-bottom: .7rem; margin-bottom: clamp(2rem, 6vw, 4rem);
}
.rule-top span:first-child { color: var(--hot); }
h1 {
  font-family: var(--display); font-weight: 800;
  font-size: clamp(3.2rem, 15vw, 10rem);
  line-height: .86; letter-spacing: -.035em;
  margin: 0 0 1.4rem;
}
h1 .dot { color: var(--hot); }
.thesis {
  font-size: clamp(1.25rem, 3vw, 1.9rem);
  line-height: 1.32; max-width: 24ch; margin: 0 0 1.2rem; font-weight: 400;
}
@media (min-width: 700px){ .thesis { max-width: 40ch; } }
.thesis em { color: var(--hot-2); font-style: italic; }
.claim {
  font-family: var(--mono); font-size: clamp(.85rem, 1.6vw, 1rem); letter-spacing: .01em;
  border-left: 3px solid var(--hot); padding-left: .9rem; max-width: 46ch; margin: 0 0 2.2rem;
  color: var(--ink-2);
}
.claim strong { color: var(--ink); }
.def { max-width: 56ch; margin: 0 0 2.2rem; font-size: 1.04em; color: var(--ink); }
.def .mk { display: block; margin-bottom: .35rem; }
.jump { display: flex; flex-wrap: wrap; gap: 0; font-family: var(--mono); font-size: .78rem; }
.jump a {
  text-decoration: none; color: var(--ink); padding: .65rem 1.05rem;
  border: 1px solid var(--rule-2); border-right-width: 0;
  transition: background .15s, color .15s;
}
.jump a:first-child { border-radius: 2px 0 0 2px; }
.jump a:last-child { border-right-width: 1px; border-radius: 0 2px 2px 0; }
.jump a:hover { background: var(--ink); color: var(--paper); }

/* ============ THEN / NOW ============ */
.strip {
  display: grid; gap: 0; max-width: var(--cw); margin-inline: auto;
  border-block: 1px solid var(--rule-2); margin-bottom: 0;
}
@media (min-width: 760px){ .strip { grid-template-columns: 1fr 1fr; } }
.tn { padding: 1.6rem 0; }
@media (min-width: 760px){
  .tn { padding: 1.8rem 2rem 1.8rem 0; }
  .tn.now { padding: 1.8rem 0 1.8rem 2rem; border-left: 1px solid var(--rule-2); }
}
.tn-h { font-family: var(--display); font-weight: 700; font-size: 1.25rem; margin: 0 0 .5rem; line-height: 1.1; }
.tn-h .mk { display: block; margin: 0 0 .5rem; }
.tn.now .tn-h .mk::before { content: ""; display: inline-block; width: .5em; height: .5em;
  background: var(--hot); margin-right: .5em; }
.tn p:last-child { margin: 0; color: var(--ink-2); font-size: .96em; }

/* ============ SECTION HEADER ============ */
.sec-h { display: flex; align-items: baseline; gap: 1rem; margin: 0 0 1.8rem; }
.sec-h .idx {
  font-family: var(--mono); font-weight: 600; font-size: 1.1rem; color: var(--hot);
  letter-spacing: .05em;
}
.sec-h h2 {
  font-family: var(--display); font-weight: 700; letter-spacing: -.02em;
  font-size: clamp(2rem, 5vw, 3rem); margin: 0; line-height: 1;
}
.sec-h .sec-line { flex: 1; height: 1px; background: var(--rule-2); align-self: center; }

/* ============ 01 WHY ============ */
.why { list-style: none; counter-reset: w; margin: 0; padding: 0; max-width: 62ch; }
.why li {
  counter-increment: w; position: relative;
  padding: 1.1rem 0 1.1rem 3.2rem; border-top: 1px solid var(--rule);
}
.why li:last-child { border-bottom: 1px solid var(--rule); }
.why li::before {
  content: "0" counter(w); position: absolute; left: 0; top: 1.1rem;
  font-family: var(--mono); font-size: .85rem; color: var(--hot); font-weight: 600;
}
.why b { font-family: var(--display); font-weight: 600; }

/* ============ 02 WHEN — persona ============ */
.seg {
  display: inline-flex; margin: 1.2rem 0 1.6rem; border: 1px solid var(--rule-2); border-radius: 3px;
  overflow: hidden; flex-wrap: wrap;
}
.seg button {
  font-family: var(--mono); font-size: .78rem; letter-spacing: .08em; text-transform: uppercase;
  background: transparent; color: var(--ink-2); border: 0; border-right: 1px solid var(--rule-2);
  padding: .75rem 1.2rem; min-height: 44px; cursor: pointer; transition: background .15s, color .15s;
}
.seg button:last-child { border-right: 0; }
.seg button[aria-selected="true"] { background: var(--hot-2); color: #fff; }
.seg button:hover:not([aria-selected="true"]) { background: rgba(27,24,19,.06); color: var(--ink); }

.persona article { display: none; }
.persona article.on { display: block; animation: fade .35s ease both; }
.p-lede { font-family: var(--display); font-weight: 600; font-size: clamp(1.2rem,2.6vw,1.6rem);
          line-height: 1.2; margin: 0 0 1.1rem; max-width: 30ch; }
.persona dl { display: grid; grid-template-columns: max-content 1fr; gap: .2rem 1.4rem; margin: 0; max-width: 64ch; }
.persona dt { font-family: var(--mono); font-size: .68rem; letter-spacing: .14em; text-transform: uppercase;
              color: var(--hot-2); padding-top: .55rem; }
.persona dd { margin: 0; padding: .45rem 0; border-top: 1px solid var(--rule); }
.persona dl > dt:first-of-type, .persona dl > dt:first-of-type + dd { border-top: 0; }
.persona dd b { font-weight: 600; }

.vpc {
  margin: 2.2rem 0 0; padding: 1.1rem 1.3rem; background: var(--paper);
  border: 1px solid var(--rule-2); border-left: 3px solid var(--hot); border-radius: 2px;
  max-width: 70ch; font-size: .98em;
}
.sec.alt .vpc { background: rgba(255,255,255,.35); }
.vpc .mk { display: block; margin-bottom: .4rem; }

/* ============ 03 HOW — ladder ============ */
.ladder { list-style: none; counter-reset: r; margin: 1rem 0 2rem; padding: 0; }
.ladder li {
  counter-increment: r; display: grid; grid-template-columns: 1.8rem 1fr; gap: .2rem 1rem;
  padding: .85rem 1rem .85rem .6rem; border-top: 1px solid var(--rule); align-items: baseline;
  transition: background .15s;
}
.ladder li:last-child { border-bottom: 1px solid var(--rule); }
.ladder li::before { content: counter(r); grid-row: 1 / span 2;
  font-family: var(--mono); font-weight: 600; color: var(--ink-2); font-size: .9rem; }
.ladder .rung { font-family: var(--display); font-weight: 600; font-size: 1.08rem; }
.ladder .d { grid-column: 2; color: var(--ink-2); font-size: .94em; }
.ladder li.sweet { background: rgba(229,66,31,.07); }
.ladder li.sweet::before { color: var(--hot); }
.ladder li.sweet .rung::after { content: "· sweet spot"; color: var(--hot-2); font-family: var(--mono);
  font-size: .68rem; letter-spacing: .06em; margin-left: .5rem; text-transform: uppercase; }
/* live highlight from the decider */
.ladder li.pick { background: var(--ink); color: var(--paper); }
.ladder li.pick::before, .ladder li.pick .d { color: #cdbfa0; }
.ladder li.pick .rung { color: #fff; }
.ladder li.pick .rung::after { content: "← your pick"; color: var(--hot); }

.tradeoff {
  font-family: var(--display); font-weight: 700; letter-spacing: -.01em;
  font-size: clamp(1.1rem, 3vw, 1.7rem); margin: 1.4rem 0 0; line-height: 1.2;
}
.tradeoff span { color: var(--hot); margin: 0 .5rem; font-weight: 600; }
.kicker { max-width: 62ch; margin: 1.6rem 0 0; padding: 1.1rem 1.3rem; background: var(--ink);
  color: #d6cdbb; border-radius: 2px; font-size: 1.02em; }
.kicker .mk { display: block; color: #e8a07f; margin-bottom: .4rem; }
.kicker strong { color: #fff; font-weight: 600; }

/* ============ WORKBENCH — agent loop ============ */
.loop {
  font-family: var(--mono); font-weight: 600; text-transform: uppercase;
  font-size: clamp(.9rem, 2.3vw, 1.3rem); letter-spacing: .03em; line-height: 1.9;
  background: var(--ink); color: var(--paper);
  padding: 1.15rem 1.35rem; border-radius: 2px; margin: 1.4rem 0; max-width: 64ch;
}
.loop i { color: #ff7a5c; font-style: normal; margin: 0 .2em; }
.loop b { color: var(--hot); font-size: 1.25em; margin-left: .35em; }
.loop .loop-note { display: block; font-family: var(--mono); font-weight: 400; text-transform: uppercase;
  font-size: .66rem; letter-spacing: .16em; color: #b3a98f; margin-top: .8rem; }

/* ============ USE CASES ============ */
.uses { list-style: none; counter-reset: u; margin: 1.2rem 0 0; padding: 0; display: grid; gap: .8rem; }
@media (min-width: 720px){ .uses { grid-template-columns: 1fr 1fr; } }
.uses li { border: 1px solid var(--rule-2); border-radius: 2px; padding: 1.05rem 1.2rem;
  background: rgba(255,255,255,.32); color: var(--ink-2); font-size: .96em; }
.uses .mk { display: block; margin-bottom: .4rem; }
.uses b { display: block; font-family: var(--display); font-weight: 600; font-size: 1.18rem;
  color: var(--ink); margin-bottom: .3rem; }

/* ============ LANDSCAPE + CTA ============ */
.land-tags { font-family: var(--mono); font-weight: 600; font-size: clamp(.9rem,2vw,1.05rem);
  letter-spacing: .03em; color: var(--hot-2); margin: .4rem 0 1.3rem; }
.bear { margin-top: 1.5rem; max-width: 60ch; font-size: 1.02em; }
.bear .mk { display: block; margin-bottom: .3rem; }
.cta { margin-top: 2.4rem; background: var(--ink); color: var(--paper); border-radius: 2px;
  padding: 1.8rem 2rem; border-left: 6px solid var(--hot); }
.cta p { margin: 0; }
.cta-kick { font-family: var(--mono); text-transform: uppercase; letter-spacing: .18em;
  font-size: .7rem; color: #b3a98f; margin-bottom: .7rem !important; }
.cta-big { font-family: var(--display); font-weight: 700; letter-spacing: -.02em; line-height: 1.12;
  font-size: clamp(1.45rem, 4vw, 2.5rem); }
.cta-big span { color: var(--hot); }

/* ============ DECIDER ============ */
.decider { display: grid; gap: 1.4rem; margin-top: 1.5rem; }
@media (min-width: 880px){ .decider { grid-template-columns: 1.05fr .95fr; align-items: start; } }
.d-form { display: grid; gap: 1rem; }
.q { border: 1px solid var(--rule-2); border-radius: 2px; margin: 0; padding: .8rem 1.1rem 1rem;
     background: rgba(255,255,255,.3); }
.q legend { font-family: var(--display); font-weight: 600; font-size: 1rem; padding: 0 .4rem; }
.q label { display: flex; align-items: center; gap: .6rem; padding: .22rem 0; cursor: pointer; font-size: .98em; }
.q input { accent-color: var(--hot); width: 1rem; height: 1rem; }

.d-out { position: sticky; top: 1rem; background: var(--ink); color: var(--paper);
         border-radius: 2px; padding: 1.5rem 1.6rem; }
.d-verdict { font-family: var(--display); font-weight: 700; font-size: 1.5rem; line-height: 1.08;
  padding-bottom: .8rem; margin-bottom: .8rem; border-bottom: 1px solid rgba(255,255,255,.16); }
.d-verdict.lvl0 { color: #9bd9b0; }
.d-verdict.lvl1 { color: #cdbfa0; }
.d-verdict.lvl2 { color: #f0a24a; }
.d-verdict.lvl3 { color: var(--hot); }
.d-rationale { color: #d6cdbb; margin: 0 0 1.3rem; font-size: .98em; min-height: 3.4em; }
.d-meta { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.d-meta .mk { color: #b3a98f; display: block; margin: 0 0 .25rem; }
.d-meta strong { font-family: var(--display); font-size: 1.02rem; color: #fff; }
.d-fallback { color: var(--hot); }

/* ============ OBJECTIONS ============ */
.obs { max-width: 64ch; }
.obs p { padding: 1rem 0; border-top: 1px solid var(--rule); margin: 0; color: var(--ink-2); }
.obs p:last-child { border-bottom: 1px solid var(--rule); }
.obs b { color: var(--ink); font-family: var(--display); font-weight: 600; }

/* ============ FOOTER ============ */
.foot { background: var(--ink); color: #cdc4b2; padding: 2.6rem 0; margin-top: 0;
        border-top: 3px solid var(--hot); }
.foot > * { max-width: var(--cw); margin-inline: auto; }
.foot p { margin: .3rem 0; font-family: var(--mono); font-size: .8rem; letter-spacing: .02em; }
.foot b { color: #fff; }
.foot a { color: var(--hot); }
.foot .disc { color: #9a917f; max-width: 70ch; line-height: 1.7; font-size: .78rem;
              border-top: 1px solid rgba(255,255,255,.14); margin-top: 1.1rem; padding-top: 1.1rem; }
.foot .disc a { color: #e8dcc4; }

/* ============ MOTION ============ */
@keyframes fade { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
@keyframes loadup { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }
.load { opacity: 0; animation: loadup .7s cubic-bezier(.2,.7,.2,1) forwards; animation-delay: var(--d, 0s); }
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .load, .reveal { opacity: 1 !important; transform: none !important; animation: none !important; transition: none !important; }
  .persona article.on { animation: none; }
}