/* =========================================================================
   IPC Ledger — case study stylesheet
   Matches the portfolio's "commercial report dossier" grammar; palette is
   the product's own: ledger green on cool paper, drafting-ink panels.
   Fonts: Fraunces (display) · Archivo (UI) · IBM Plex Mono (figures)
   ========================================================================= */

:root{
  --ink:#15211B; --ink-2:#1B2B23;
  --paper:#EFF2ED; --paper-2:#F5F7F2; --surface:#FBFCF9;
  --green:#1C5E49; --green-2:#14483A;
  --steel:#5A6B66; --red:#A93A30; --amber-flag:#B07F2A;
  --line:#D8DED4; --line-strong:#C3CCC0;
  --line-ink:rgba(232,238,230,0.14);
  --muted:#66716A; --text:#1B201D; --text-inv:#E7EDE6; --text-inv-dim:#A9B5AC;

  --serif:'Fraunces',Georgia,'Times New Roman',serif;
  --sans:'Archivo',system-ui,-apple-system,sans-serif;
  --mono:'IBM Plex Mono','SFMono-Regular',monospace;

  --radius:10px; --radius-sm:7px;
  --shadow:0 1px 2px rgba(21,33,27,.05), 0 14px 34px -22px rgba(21,33,27,.30);
  --shadow-lg:0 28px 60px -30px rgba(21,33,27,.45);
  --maxw:1180px;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  color:var(--text);
  background:var(--paper);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  background-image:
    linear-gradient(rgba(21,33,27,.022) 1px,transparent 1px),
    linear-gradient(90deg,rgba(21,33,27,.022) 1px,transparent 1px);
  background-size:30px 30px;
}
a{color:inherit;text-decoration:none}
em{font-style:italic}
strong,b{font-weight:700}
code{font-family:var(--mono);font-size:.88em;background:rgba(21,33,27,.06);padding:.08em .35em;border-radius:4px}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 clamp(18px,4vw,40px)}
.muted{color:var(--muted)}
.num{font-family:var(--mono);font-variant-numeric:tabular-nums}

/* ----------------------------- TOP BAR ---------------------------------- */
.topbar{
  position:sticky;top:0;z-index:50;
  display:flex;align-items:center;gap:20px;
  padding:14px clamp(18px,4vw,40px);
  background:rgba(239,242,237,.86);
  backdrop-filter:saturate(140%) blur(10px);
  -webkit-backdrop-filter:saturate(140%) blur(10px);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:800}
.brand__mark{width:26px;height:26px;color:var(--green);flex-shrink:0}
.brand__text{font-family:var(--mono);font-weight:600;letter-spacing:.02em;font-size:.95rem}
.brand__dot{color:var(--green);margin:0 1px}
.topnav{margin-left:auto;display:flex;gap:26px;font-size:.86rem;font-weight:600}
.topnav a{color:var(--muted);position:relative;padding:4px 0;transition:color .2s}
.topnav a:hover{color:var(--ink)}
.topnav a::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:1.5px;background:var(--green);transition:width .25s}
.topnav a:hover::after{width:100%}

/* ----------------------------- BUTTONS ---------------------------------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--sans);font-weight:700;font-size:.86rem;letter-spacing:.01em;
  padding:11px 18px;border-radius:8px;border:1.5px solid transparent;
  cursor:pointer;transition:transform .18s,box-shadow .2s,background .2s,color .2s,border-color .2s;
  white-space:nowrap;
}
.btn__ico{width:14px;height:14px;transition:transform .2s}
.btn:hover .btn__ico{transform:translate(2px,-2px)}
.btn--solid{background:var(--green);color:#fff;box-shadow:0 8px 20px -10px rgba(28,94,73,.7)}
.btn--solid:hover{background:var(--green-2);transform:translateY(-1px);box-shadow:0 12px 26px -10px rgba(20,72,58,.8)}
.btn--ghost{border-color:var(--line-strong);color:var(--ink);background:transparent}
.btn--ghost:hover{border-color:var(--green);color:var(--green)}
.btn--line{border-color:rgba(232,238,230,.35);color:var(--text-inv)}
.btn--line:hover{border-color:var(--green);color:#fff}
.btn--lg{padding:15px 26px;font-size:.95rem}

/* ------------------------------- HERO ----------------------------------- */
.hero{position:relative;overflow:hidden;background:var(--ink);color:var(--text-inv);
  padding:clamp(56px,9vw,104px) 0 clamp(48px,7vw,84px)}
.hero__grid-bg{position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(var(--line-ink) 1px,transparent 1px),
    linear-gradient(90deg,var(--line-ink) 1px,transparent 1px);
  background-size:36px 36px;
  -webkit-mask-image:radial-gradient(130% 110% at 72% -10%,#000 38%,transparent 100%);
          mask-image:radial-gradient(130% 110% at 72% -10%,#000 38%,transparent 100%);}
.hero__grid-bg::after{content:"";position:absolute;right:-10%;top:-30%;width:60%;height:120%;
  background:radial-gradient(closest-side,rgba(28,94,73,.26),transparent 70%);}
.hero__inner{position:relative;display:grid;grid-template-columns:1.6fr .95fr;gap:clamp(28px,5vw,64px);align-items:start}
.eyebrow{font-family:var(--mono);font-size:.74rem;letter-spacing:.16em;text-transform:uppercase;
  color:#6FBFA4;margin-bottom:20px}
.hero__title{font-family:var(--serif);font-weight:500;font-size:clamp(2.4rem,5.6vw,4.2rem);
  line-height:1.04;letter-spacing:-.015em;color:#fff}
.hero__title em{color:#6FBFA4;font-weight:500}
.hero__sub{max-width:56ch;margin-top:24px;font-size:1.06rem;color:var(--text-inv-dim);line-height:1.65}
.hero__sub strong{color:var(--text-inv)}
.hero__cta{margin-top:32px;display:flex;gap:14px;flex-wrap:wrap}

.titleblock{border:1px solid var(--line-ink);border-radius:var(--radius);
  background:linear-gradient(180deg,rgba(232,238,230,.05),rgba(232,238,230,.01));
  overflow:hidden;font-family:var(--mono);font-size:.8rem}
.titleblock__row{display:flex;justify-content:space-between;gap:12px;align-items:baseline;
  padding:13px 16px;border-bottom:1px solid var(--line-ink)}
.titleblock__row:last-child{border-bottom:none}
.titleblock__row span{color:var(--text-inv-dim);text-transform:uppercase;letter-spacing:.1em;font-size:.66rem}
.titleblock__row b{color:#fff;font-weight:500;text-align:right}
.titleblock__row--accent{background:rgba(28,94,73,.18)}
.titleblock__row--accent b{color:#6FBFA4}

/* ------------------------------ SECTIONS -------------------------------- */
.section{padding:clamp(56px,8vw,96px) 0}
.section--story{background:var(--paper-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}

.shead{display:flex;gap:22px;align-items:flex-start;margin-bottom:38px}
.shead__num{font-family:var(--mono);font-size:.9rem;font-weight:600;color:var(--green);
  border:1px solid var(--green);border-radius:6px;padding:5px 9px;line-height:1;margin-top:6px}
.shead__title{font-family:var(--serif);font-weight:500;font-size:clamp(1.8rem,3.6vw,2.7rem);
  letter-spacing:-.01em;line-height:1.08;color:var(--ink)}
.shead__desc{margin-top:8px;max-width:64ch;color:var(--muted);font-size:1rem}
.shead__desc b{color:var(--ink)}

/* ----------------------------- EVENT CARDS ------------------------------ */
.events{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.event{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px;box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.event:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.event__ico{width:46px;height:46px;border-radius:10px;display:grid;place-items:center;margin-bottom:18px;
  background:rgba(90,107,102,.12);color:var(--steel)}
.event__ico svg{width:24px;height:24px}
.event__ico[data-tone="red"]{background:rgba(169,58,48,.12);color:var(--red)}
.event__ico[data-tone="amber"]{background:rgba(176,127,42,.16);color:var(--amber-flag)}
.event__ico[data-tone="steel"]{background:rgba(90,107,102,.14);color:var(--steel)}
.event__ico[data-tone="green"]{background:rgba(28,94,73,.13);color:var(--green)}
.event__tag{font-family:var(--mono);font-size:.7rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-bottom:8px}
.event h3{font-family:var(--serif);font-weight:600;font-size:1.3rem;color:var(--ink);margin-bottom:10px}
.event p{color:#454c47;font-size:.94rem;line-height:1.6}
.event p b{color:var(--ink)}

/* differentiator chips */
.chips{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.chip{font-family:var(--mono);font-size:.78rem;color:var(--green-2);
  border:1px solid rgba(28,94,73,.4);border-radius:999px;padding:8px 16px;background:rgba(28,94,73,.06)}

/* --------------------------- APPROACH PANEL ----------------------------- */
.approach{background:var(--ink);color:var(--text-inv);border-radius:var(--radius);
  padding:clamp(28px,4vw,44px);position:relative;overflow:hidden;margin-bottom:38px}
.approach::before{content:"";position:absolute;inset:0;
  background-image:linear-gradient(var(--line-ink) 1px,transparent 1px),linear-gradient(90deg,var(--line-ink) 1px,transparent 1px);
  background-size:34px 34px;-webkit-mask-image:radial-gradient(120% 120% at 100% 0%,#000,transparent 70%);mask-image:radial-gradient(120% 120% at 100% 0%,#000,transparent 70%)}
.approach__title{position:relative;font-family:var(--serif);font-weight:500;font-size:1.6rem;color:#fff;margin-bottom:26px}
.approach__grid{position:relative;display:grid;grid-template-columns:repeat(4,1fr);gap:26px}
.approach__item{display:flex;gap:14px;align-items:flex-start}
.approach__step{flex-shrink:0;width:30px;height:30px;border-radius:8px;display:grid;place-items:center;
  background:var(--green);color:#fff;font-family:var(--mono);font-weight:600;font-size:.9rem}
.approach__item p{color:var(--text-inv-dim);font-size:.92rem;line-height:1.6}
.approach__item p b{color:#fff;font-weight:600}
.approach__item code{background:rgba(232,238,230,.12);color:#6FBFA4}

/* ----------------------------- SCREENSHOTS ------------------------------ */
.shots{display:grid;grid-template-columns:repeat(2,1fr);gap:26px}
.shot{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow)}
.shot--wide{grid-column:1 / -1}
.shot img{display:block;width:100%;height:auto}
.shot--missing img{display:none}
.shot--missing::before{content:"Screenshot pending — capture per img/SHOTLIST.txt";
  display:grid;place-items:center;min-height:230px;padding:24px;text-align:center;
  font-family:var(--mono);font-size:.78rem;color:var(--muted);
  background:repeating-linear-gradient(-45deg,transparent 0 14px,rgba(21,33,27,.03) 14px 28px)}
.shot__cap{display:flex;gap:10px;align-items:baseline;padding:12px 16px;border-top:1px solid var(--line);
  font-size:.85rem;color:var(--muted)}
.shot__cap b{font-family:var(--mono);font-size:.72rem;color:var(--green);letter-spacing:.06em}

/* ------------------------- CORRECTNESS EXHIBIT -------------------------- */
.exhibit{display:grid;grid-template-columns:1fr 1.1fr;gap:26px;margin-top:38px;align-items:stretch}
.check-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px;box-shadow:var(--shadow);font-family:var(--mono)}
.check-card__tag{font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:18px}
.check-line{display:flex;justify-content:space-between;gap:14px;padding:10px 0;
  border-bottom:1px dashed var(--line);font-size:.88rem}
.check-line:last-of-type{border-bottom:none}
.check-line .v{font-variant-numeric:tabular-nums}
.check-line--bad{color:var(--red)}
.check-line--bad .v{text-decoration:line-through}
.check-line--good{color:var(--green-2);font-weight:600}
.check-card__note{margin-top:16px;font-family:var(--sans);font-size:.86rem;color:var(--muted);line-height:1.6}
.check-card__note b{color:var(--ink)}

.ipc-summary{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);overflow:hidden}
.ipc-summary__bar{padding:12px 18px;background:var(--paper-2);border-bottom:1px solid var(--line);
  font-family:var(--mono);font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.ipc-summary table{width:100%;border-collapse:collapse;font-size:.92rem}
.ipc-summary td{padding:12px 18px;border-bottom:1px solid var(--line)}
.ipc-summary td:last-child{text-align:right;font-family:var(--mono);font-variant-numeric:tabular-nums}
.ipc-summary tr:last-child td{border-bottom:none}
.ipc-summary .net td{background:rgba(28,94,73,.1);font-weight:700;border-top:2px solid var(--line-strong)}

/* ------------------------------ GLOSSARY -------------------------------- */
.glossary{display:grid;grid-template-columns:1fr 1fr;gap:0 48px}
.gl{display:grid;grid-template-columns:190px 1fr;gap:18px;align-items:baseline;
  padding:16px 0;border-bottom:1px solid var(--line)}
.gl dt{font-family:var(--mono);font-weight:600;font-size:.92rem;color:var(--ink)}
.gl dd{color:var(--muted);font-size:.94rem;line-height:1.55}
.gl dd b{color:var(--ink)}

/* ------------------------------- SCOPE ----------------------------------- */
.scope{display:grid;grid-template-columns:1fr 1fr;gap:26px;margin-top:8px}
.scope__col{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px;box-shadow:var(--shadow)}
.scope__col h3{font-family:var(--mono);font-size:.74rem;letter-spacing:.1em;text-transform:uppercase;margin-bottom:16px}
.scope__col--yes h3{color:var(--green)}
.scope__col--no h3{color:var(--red)}
.scope__col ul{list-style:none}
.scope__col li{padding:9px 0 9px 26px;position:relative;font-size:.95rem;color:#454c47;border-bottom:1px dashed var(--line)}
.scope__col li:last-child{border-bottom:none}
.scope__col--yes li::before{content:"✓";position:absolute;left:2px;color:var(--green);font-weight:700}
.scope__col--no li::before{content:"—";position:absolute;left:2px;color:var(--red);font-weight:700}
.scope__after{margin-top:26px;max-width:70ch;color:var(--muted);font-size:1rem;line-height:1.65}
.scope__after b{color:var(--ink)}

/* ------------------------------ FOOTER ---------------------------------- */
.footer{position:relative;overflow:hidden;background:var(--ink);color:var(--text-inv);
  padding:clamp(56px,8vw,88px) 0 40px}
.footer__grid-bg{position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(var(--line-ink) 1px,transparent 1px),linear-gradient(90deg,var(--line-ink) 1px,transparent 1px);
  background-size:36px 36px;
  -webkit-mask-image:radial-gradient(120% 110% at 30% -10%,#000 40%,transparent 100%);mask-image:radial-gradient(120% 110% at 30% -10%,#000 40%,transparent 100%)}
.footer__inner{position:relative;display:flex;flex-direction:column;align-items:stretch}
.footer__cta h2{font-family:var(--serif);font-weight:500;font-size:clamp(2rem,4.5vw,3.1rem);color:#fff;letter-spacing:-.01em;line-height:1.05}
.footer__cta p{margin:18px 0 28px;max-width:52ch;color:var(--text-inv-dim);font-size:1.02rem;line-height:1.6}
.footer__meta{margin-top:44px;font-family:var(--mono);font-size:.78rem;color:var(--text-inv-dim)}
.footer__note{border-left:2px solid var(--green);padding-left:16px;line-height:1.65}
.footer__sig{margin-top:24px;padding-top:18px;border-top:1px solid var(--line-ink);letter-spacing:.02em}
.footer__sig a{color:#6FBFA4}
.footer__sig a:hover{color:#fff}

/* ------------------------------ MOTION ---------------------------------- */
[data-reveal]{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.2,1)}
[data-reveal].in{opacity:1;transform:none}
.events [data-reveal]:nth-child(2){transition-delay:.08s}
.events [data-reveal]:nth-child(3){transition-delay:.16s}
.shots [data-reveal]:nth-child(2){transition-delay:.06s}
.shots [data-reveal]:nth-child(3){transition-delay:.12s}
.shots [data-reveal]:nth-child(4){transition-delay:.18s}

@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  [data-reveal]{opacity:1;transform:none}
}

/* --------------------------- RESPONSIVE --------------------------------- */
@media (max-width:980px){
  .hero__inner{grid-template-columns:1fr}
  .titleblock{max-width:520px}
  .approach__grid{grid-template-columns:repeat(2,1fr)}
  .exhibit{grid-template-columns:1fr}
  .glossary{grid-template-columns:1fr;gap:0}
  .scope{grid-template-columns:1fr}
}
@media (max-width:760px){
  .topnav{display:none}
  .events{grid-template-columns:1fr}
  .shots{grid-template-columns:1fr}
  .approach__grid{grid-template-columns:1fr;gap:18px}
  .shead{gap:14px}
}
@media (max-width:520px){
  .topbar{gap:12px}
  .topbar .btn{padding:9px 13px;font-size:.8rem}
  .gl{grid-template-columns:1fr;gap:4px}
}