/* David Sanchez · portfolio
   Paper and ink, one accent. The accent means "a person decides here" and is used
   for nothing else, so the eye learns the system's one rule in a single glance. */

@font-face { font-family: "Geist"; src: url("../fonts/Geist-Variable.woff2") format("woff2"); font-weight: 100 900; font-display: swap; }
@font-face { font-family: "Geist Mono"; src: url("../fonts/GeistMono-Variable.woff2") format("woff2"); font-weight: 100 900; font-display: swap; }
@font-face { font-family: "Instrument Serif"; src: url("../fonts/instrument-serif-latin-400-normal.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "Instrument Serif"; src: url("../fonts/instrument-serif-latin-400-italic.woff2") format("woff2"); font-weight: 400; font-style: italic; font-display: swap; }

:root {
  --paper: #F5F3EE;
  --paper-2: #EDEAE2;
  --card: #FFFFFF;
  --ink: #131518;
  --ink-2: #3E434A;
  --ink-3: #6A707A;
  --line: #DDD9CF;
  --line-2: #CBC6BA;
  --accent: #C2410C;
  --accent-2: #E8590C;
  --accent-soft: #FBEADF;
  --ok: #17803D;
  --ok-soft: #E2F1E6;
  --flag: #B45309;
  --flag-soft: #FBF0DA;
  --console: #0F1114;
  --console-2: #171A1F;
  --console-line: #252A31;
  --console-ink: #D8DCE2;
  --console-dim: #7D8691;
  --serif: "Instrument Serif", "Iowan Old Style", Georgia, serif;
  --sans: "Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "Geist Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --wrap: 1180px;
  --r: 16px;
  --r-sm: 11px;
  --ease: cubic-bezier(.2, .7, .2, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: var(--sans); font-size: 17px; line-height: 1.6;
  font-feature-settings: "ss01", "cv11"; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
p { margin: 0 0 1em; }
h1, h2, h3 { margin: 0; font-weight: 400; }
ul, ol { margin: 0; padding: 0; }
button { font: inherit; color: inherit; }
::selection { background: var(--accent); color: #fff; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 28px; }
.narrow { max-width: 900px; }
.mono { font-family: var(--mono); }
[hidden] { display: none !important; }
.sr-only { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: 12px; top: -48px; background: var(--ink); color: var(--paper); padding: 8px 14px; border-radius: 8px; z-index: 100; text-decoration: none; }
.skip:focus { top: 12px; }
.ic { flex: none; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .5em; border: 1px solid transparent; border-radius: 999px;
  padding: .82em 1.35em; font-size: 15px; font-weight: 550; letter-spacing: -.005em; line-height: 1;
  text-decoration: none; cursor: pointer; white-space: nowrap;
  transition: transform .18s var(--ease), background .18s, color .18s, border-color .18s, box-shadow .18s;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-sm { padding: .62em 1.05em; font-size: 13.5px; }
.btn-ink { background: var(--ink); color: var(--paper); }
.btn-ink:hover { background: #000; box-shadow: 0 10px 24px -12px rgba(0,0,0,.55); }
.btn-ghost { border-color: var(--line-2); background: transparent; }
.btn-ghost:hover { border-color: var(--ink); background: var(--card); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: var(--accent-2); box-shadow: 0 12px 26px -12px rgba(194,65,12,.7); }
.btn-quiet { background: transparent; border-color: #343A42; color: var(--console-ink); }
.btn-quiet:hover { border-color: var(--console-ink); }
.btn[disabled] { opacity: .55; cursor: default; transform: none; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(245,243,238,.82); backdrop-filter: saturate(1.4) blur(14px); -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid transparent; transition: border-color .25s, background .25s;
}
.site-header.is-scrolled { border-bottom-color: var(--line); }
.header-inner { display: flex; align-items: center; gap: 28px; height: 68px; }
.wordmark { font-family: var(--serif); font-size: 25px; letter-spacing: -.01em; text-decoration: none; line-height: 1; white-space: nowrap; }
.nav { display: flex; gap: 26px; margin-left: 8px; }
.nav a { text-decoration: none; font-size: 14.5px; color: var(--ink-2); transition: color .15s; }
.nav a:hover { color: var(--ink); }
.header-actions { margin-left: auto; display: flex; align-items: center; gap: 14px; }
.lang { display: inline-flex; border: 1px solid var(--line-2); border-radius: 999px; padding: 3px; }
.lang a { font-family: var(--mono); font-size: 11.5px; letter-spacing: .06em; text-decoration: none; padding: 5px 9px; border-radius: 999px; color: var(--ink-3); }
.lang a[aria-current="true"] { background: var(--ink); color: var(--paper); }

/* ---------- reveal ---------- */
[data-reveal] { opacity: 0; transform: translateY(14px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
[data-reveal].is-in { opacity: 1; transform: none; }
.no-js [data-reveal] { opacity: 1; transform: none; }

/* ---------- type ---------- */
.eyebrow, .pane-label, .label-h, .card-kicker, .card-num, .st-num, .st-kind, .selector-title, .bignum-note, .tag-sample, .case-kicker .mono {
  font-family: var(--mono); font-size: 12px; letter-spacing: .09em; text-transform: uppercase;
}
.h2 { font-family: var(--serif); font-size: clamp(2.3rem, 4.6vw, 3.7rem); line-height: 1.02; letter-spacing: -.015em; }
.h3 { font-family: var(--serif); font-size: clamp(1.8rem, 3vw, 2.4rem); line-height: 1.05; }
.section-head { display: grid; grid-template-columns: 1fr 1.1fr; gap: 40px; align-items: end; margin-bottom: 44px; }
.section-head-sm { margin-bottom: 28px; }
.section-intro { color: var(--ink-2); font-size: 17.5px; margin: 0; max-width: 58ch; }

/* ---------- hero ---------- */
.hero { padding: 72px 0 40px; }
.eyebrow { color: var(--accent); margin: 0 0 26px; }
.hero-title { font-family: var(--serif); font-size: clamp(2.9rem, 6.3vw, 5.9rem); line-height: .98; letter-spacing: -.028em; }
.hero-title span { display: block; }
.hero-title em { display: block; font-style: italic; color: var(--accent); }
.hero-grid { display: grid; grid-template-columns: 1.35fr 1fr; gap: 48px; align-items: end; margin-top: 38px; }
.lede { font-size: clamp(1.08rem, 1.5vw, 1.24rem); line-height: 1.55; color: var(--ink-2); max-width: 60ch; margin: 0; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; justify-content: flex-end; }
.creds { margin: 30px 0 0; font-size: 14px; color: var(--ink-3); }

/* signal line: automated nodes, one human gate */
.signal { margin-top: 58px; }
.signal-track { position: relative; height: 22px; display: flex; justify-content: space-between; align-items: center; }
.signal-track::before { content: ""; position: absolute; left: 0; right: 0; top: 50%; height: 1px; background: var(--line-2); }
.sig-node { position: relative; width: 11px; height: 11px; border-radius: 50%; background: var(--paper); border: 1.5px solid var(--ink); z-index: 1; }
.sig-gate { width: 22px; height: 22px; border-color: var(--accent); background: var(--accent-soft); animation: gate 7s var(--ease) infinite; }
.sig-packet { position: absolute; top: 50%; left: 0; width: 9px; height: 9px; margin: -4.5px 0 0 -4.5px; border-radius: 50%; background: var(--ink); z-index: 2; box-shadow: 0 0 0 5px rgba(19,21,24,.08); animation: packet 7s var(--ease) infinite; }
.signal-labels { position: relative; height: 22px; margin-top: 12px; font-family: var(--mono); font-size: 11px; letter-spacing: .09em; text-transform: uppercase; color: var(--ink-3); }
.signal-labels span { position: absolute; transform: translateX(-50%); white-space: nowrap; }
.sl-a { left: 31%; } .sl-h { left: 62.5%; color: var(--accent); } .sl-b { left: 81.25%; }
@keyframes packet {
  0% { left: 0; opacity: 0; } 4% { opacity: 1; }
  48% { left: 62.5%; } 66% { left: 62.5%; }
  96% { left: 100%; opacity: 1; } 100% { left: 100%; opacity: 0; }
}
@keyframes gate {
  0%, 44% { background: var(--accent-soft); border-color: var(--accent); box-shadow: 0 0 0 0 rgba(194,65,12,0); }
  52% { box-shadow: 0 0 0 9px rgba(194,65,12,.14); }
  60% { background: var(--ok-soft); border-color: var(--ok); box-shadow: 0 0 0 0 rgba(23,128,61,0); }
  90% { background: var(--ok-soft); border-color: var(--ok); }
  100% { background: var(--accent-soft); border-color: var(--accent); }
}

/* ---------- proof ---------- */
.proof { padding: 30px 0 90px; }
.proof-grid { display: grid; grid-template-columns: repeat(3, 1fr); background: linear-gradient(var(--ink), var(--ink)) no-repeat 28px 0 / calc(100% - 56px) 1px; }
.proof-item { padding: 26px 28px 0 0; }
.proof-item + .proof-item { padding-left: 28px; border-left: 1px solid var(--line); }
.proof-n { font-family: var(--serif); font-size: clamp(3.4rem, 6vw, 5.2rem); line-height: 1; letter-spacing: -.02em; }
.proof-label { margin: 12px 0 0; color: var(--ink-2); font-size: 15px; max-width: 30ch; }

/* ---------- selector + cards ---------- */
.work { padding: 40px 0 100px; }
.selector { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 22px 24px 18px; margin-bottom: 26px; }
.selector-title { color: var(--ink-3); margin: 0 0 14px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { border: 1px solid var(--line-2); background: var(--paper); border-radius: 999px; padding: 9px 16px; font-size: 14.5px; cursor: pointer; transition: all .18s var(--ease); }
.chip:hover { border-color: var(--ink); }
.chip[aria-pressed="true"] { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.chip-reset { background: transparent; color: var(--ink-3); border-style: dashed; }
.pain { margin: 14px 0 0; font-family: var(--serif); font-size: 1.45rem; line-height: 1.25; min-height: 1.3em; }

.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); transition: transform .35s var(--ease), box-shadow .35s var(--ease), opacity .35s, border-color .35s; }
.card:hover { transform: translateY(-3px); box-shadow: 0 26px 50px -30px rgba(19,21,24,.35); border-color: var(--line-2); }
.card.is-dim { opacity: .32; }
.card.is-lit { border-color: var(--ink); box-shadow: 0 0 0 1px var(--ink); }
.card-link { display: flex; flex-direction: column; height: 100%; padding: 24px 26px 22px; text-decoration: none; }
.card-top { display: flex; align-items: center; gap: 10px; color: var(--ink-3); }
.card-num { color: var(--ink); }
.card-top .badge { margin-left: auto; }
.card-body { margin: 26px 0 22px; }
.card-number { font-family: var(--serif); font-size: clamp(3.2rem, 5vw, 4.6rem); line-height: .95; letter-spacing: -.02em; }
.card-number-label { font-size: 14px; color: var(--ink-3); margin-top: 6px; }
.card-title { font-family: var(--sans); font-size: 21px; font-weight: 600; letter-spacing: -.012em; line-height: 1.25; margin: 22px 0 8px; }
.card-line { color: var(--ink-2); font-size: 15.5px; margin: 0; }
.card-foot { margin-top: auto; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 18px; border-top: 1px solid var(--line); }
.card-cta { font-size: 14px; font-weight: 550; white-space: nowrap; }
.card-cta span { display: inline-block; transition: transform .2s var(--ease); }
.card:hover .card-cta span { transform: translateX(4px); }
.card-feature { grid-column: 1 / -1; }
.card-feature .card-body { display: grid; grid-template-columns: minmax(260px, .9fr) 1.4fr; gap: 40px; align-items: end; }
.card-feature .card-number { font-size: clamp(4.4rem, 9vw, 8rem); }
.card-feature .card-title { margin-top: 0; font-size: 26px; }
.card-feature .card-line { font-size: 17px; }
.card-blueprint { background: repeating-linear-gradient(0deg, transparent 0 23px, rgba(19,21,24,.035) 23px 24px), repeating-linear-gradient(90deg, transparent 0 23px, rgba(19,21,24,.035) 23px 24px), var(--card); border-style: dashed; border-color: var(--line-2); }

.minitrack { display: flex; align-items: center; gap: 5px; }
.minitrack i { width: 8px; height: 8px; border-radius: 50%; border: 1.5px solid var(--ink-2); }
.minitrack i.k-agent { background: var(--ink-2); }
.minitrack i.k-gate { width: 14px; height: 14px; border-color: var(--accent); background: var(--accent-soft); }
.minitrack i.k-guard { border-style: dashed; }

.badge { display: inline-flex; align-items: center; gap: 6px; font-family: var(--mono); font-size: 10.5px; letter-spacing: .08em; text-transform: uppercase; padding: 5px 9px; border-radius: 999px; border: 1px solid var(--line); background: var(--paper); color: var(--ink-2); white-space: nowrap; }
.badge-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--ink-3); }
.badge-production .badge-dot { background: var(--ok); box-shadow: 0 0 0 3px rgba(23,128,61,.15); }
.badge-blueprint { border-style: dashed; border-color: var(--line-2); }

/* ---------- more ---------- */
.more { padding: 20px 0 100px; }
.more-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.more-item { border-top: 1px solid var(--ink); padding: 18px 4px 0 0; transition: opacity .35s; }
.more-item h3 { font-family: var(--sans); font-weight: 600; font-size: 16.5px; margin-bottom: 6px; }
.more-item p { font-size: 15px; color: var(--ink-2); margin: 0; }
.more-item.is-dim { opacity: .3; }

/* ---------- how ---------- */
.how { padding: 100px 0; background: var(--card); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.how .h2 { margin-bottom: 44px; }
.how-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; }
.how-item { border-top: 1px solid var(--line-2); padding-top: 18px; }
.how-n { font-family: var(--mono); font-size: 12px; color: var(--accent); }
.how-item h3 { font-family: var(--sans); font-size: 18px; font-weight: 600; margin: 10px 0 8px; line-height: 1.3; }
.how-item p { font-size: 15.5px; color: var(--ink-2); margin: 0; }
.how-shapes { margin: 48px 0 0; font-family: var(--serif); font-size: clamp(1.4rem, 2.3vw, 1.9rem); line-height: 1.25; max-width: 40ch; }

/* ---------- about ---------- */
.about { padding: 110px 0; }
.about-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 70px; align-items: start; }
.about .h2 { margin-bottom: 28px; }
.about-p { font-size: 18px; color: var(--ink-2); max-width: 60ch; }
.about-p:first-of-type { font-size: 20px; color: var(--ink); }
.creds-list { margin: 8px 0 0; border-top: 1px solid var(--ink); }
.creds-list div { display: grid; grid-template-columns: 110px 1fr; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.creds-list dt { font-family: var(--mono); font-size: 11.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); padding-top: 3px; }
.creds-list dd { margin: 0; font-size: 15.5px; }

/* ---------- faq ---------- */
.faq { padding: 30px 0 110px; }
.faq-grid { display: grid; grid-template-columns: 1fr 1.6fr; gap: 60px; }
.faq-list { border-top: 1px solid var(--ink); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; gap: 20px; padding: 20px 0; font-size: 17.5px; font-weight: 550; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-plus { position: relative; flex: none; width: 14px; height: 14px; margin-top: 6px; }
.faq-plus::before, .faq-plus::after { content: ""; position: absolute; background: var(--ink); left: 0; right: 0; top: 6px; height: 1.5px; transition: transform .25s var(--ease); }
.faq-plus::after { transform: rotate(90deg); }
.faq-item[open] .faq-plus::after { transform: rotate(0); }
.faq-item p { color: var(--ink-2); margin: -4px 0 22px; max-width: 64ch; }

/* ---------- CTA band ---------- */
.cta-band { background: var(--ink); color: var(--paper); padding: 100px 0; }
.cta-inner { display: grid; grid-template-columns: 1.2fr 1fr; gap: 60px; align-items: end; }
.cta-title { font-family: var(--serif); font-size: clamp(2.6rem, 5.6vw, 4.8rem); line-height: 1; letter-spacing: -.02em; }
.cta-side p { color: #C9CDD3; font-size: 17.5px; margin-bottom: 26px; }

/* ---------- footer ---------- */
.site-footer { background: var(--ink); color: #9AA1AB; border-top: 1px solid #262A30; padding: 34px 0 44px; font-size: 14px; }
.footer-inner { display: flex; justify-content: space-between; gap: 40px; align-items: flex-end; flex-wrap: wrap; }
.wordmark-footer { color: var(--paper); font-size: 24px; }
.footer-line { margin: 8px 0 0; }
.footer-right { text-align: right; }
.footer-note { margin: 0 0 6px; }
.footer-meta { margin: 0; }
.footer-meta a { color: #C9CDD3; }

/* ================= case pages ================= */
.case-hero { padding: 36px 0 50px; }
.back { display: inline-flex; gap: 8px; font-size: 14px; color: var(--ink-3); text-decoration: none; margin-bottom: 40px; }
.back:hover { color: var(--ink); }
.case-hero-grid { display: grid; grid-template-columns: 1.55fr 1fr; gap: 56px; align-items: end; }
.case-kicker { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; margin: 0 0 22px; color: var(--ink-3); font-size: 14px; }
.case-kicker .sep { color: var(--line-2); }
.case-kicker .badge { margin-left: 6px; }
.case-title { font-family: var(--serif); font-size: clamp(2.7rem, 6vw, 5.2rem); line-height: .98; letter-spacing: -.024em; }
.case-sub { font-size: clamp(1.08rem, 1.5vw, 1.22rem); color: var(--ink-2); margin: 24px 0 30px; max-width: 58ch; }
.case-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.bignum { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 30px 30px 26px; position: relative; overflow: hidden; }
.bignum::after { content: ""; position: absolute; right: -40px; top: -40px; width: 140px; height: 140px; border-radius: 50%; background: radial-gradient(circle, var(--accent-soft), transparent 70%); }
.bignum-n { font-family: var(--serif); font-size: clamp(4.4rem, 9vw, 7.6rem); line-height: .9; letter-spacing: -.03em; position: relative; }
.case-blueprint .bignum-n { font-size: clamp(3.4rem, 6.4vw, 5.6rem); }
.bignum-label { font-size: 17px; font-weight: 550; margin-top: 14px; }
.bignum-note { color: var(--ink-3); margin-top: 8px; font-size: 11.5px; }
.meta-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 0; margin: 44px 0 0; border-top: 1px solid var(--ink); }
.meta-row div { padding: 16px 20px 0 0; }
.meta-row div + div { padding-left: 20px; border-left: 1px solid var(--line); }
.meta-row dt { font-family: var(--mono); font-size: 11px; letter-spacing: .09em; text-transform: uppercase; color: var(--ink-3); }
.meta-row dd { margin: 6px 0 0; font-size: 15.5px; }
.confidential { margin: 22px 0 0; font-size: 13.5px; color: var(--ink-3); }

.case-summary { padding: 50px 0 40px; }
.summary { font-family: var(--serif); font-size: clamp(1.55rem, 2.7vw, 2.15rem); line-height: 1.28; letter-spacing: -.005em; margin: 0; }

.case-section { padding: 46px 0; }
.split { display: grid; grid-template-columns: 1fr 2.2fr; gap: 40px; }
.label-h { color: var(--ink-3); display: flex; align-items: center; gap: 8px; margin: 0 0 16px; }
.body-l { font-size: 19px; line-height: 1.6; color: var(--ink-2); margin: 0; max-width: 62ch; }

/* system module */
.system { padding: 70px 0 60px; }
.system-head { display: grid; grid-template-columns: 1fr 1.25fr; gap: 40px; align-items: end; margin-bottom: 32px; }
.stations { list-style: none; display: grid; grid-template-columns: repeat(auto-fill, minmax(146px, 1fr)); gap: 10px; }
.station {
  position: relative; background: var(--card); border: 1px solid var(--line); border-radius: 13px;
  padding: 18px 14px 14px; cursor: pointer; min-height: 116px; display: flex; flex-direction: column;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s, background .3s;
}
.station:hover { border-color: var(--ink-3); }
.st-bar { position: absolute; left: 14px; right: 14px; top: -1px; height: 3px; border-radius: 0 0 3px 3px; background: var(--line); transition: background .3s; overflow: hidden; }
.st-num { color: var(--ink-3); font-size: 11px; }
.st-label { font-weight: 600; font-size: 15px; line-height: 1.25; margin-top: 6px; letter-spacing: -.01em; }
.st-kind { display: inline-flex; align-items: center; gap: 6px; margin-top: auto; padding-top: 12px; color: var(--ink-3); font-size: 10.5px; }
.station.kind-gate { border-color: var(--accent); background: linear-gradient(180deg, var(--accent-soft), var(--card) 75%); }
.station.kind-gate .st-kind, .station.kind-gate .st-num { color: var(--accent); }
.station.kind-gate .st-bar { background: var(--accent); }
.station.kind-guard { border-style: dashed; border-color: var(--line-2); }
.station.is-selected { border-color: var(--ink); }
.station.is-done .st-bar { background: var(--ink); }
.station.kind-gate.is-done .st-bar { background: var(--ok); }
.station.is-active { border-color: var(--ink); transform: translateY(-3px); box-shadow: 0 18px 34px -20px rgba(19,21,24,.5); }
.station.is-active .st-bar { background: var(--accent); }
.station.is-active .st-bar::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, transparent, rgba(255,255,255,.75), transparent); animation: sheen 1.1s linear infinite; }
.station.kind-gate.is-waiting { animation: waitpulse 1.6s var(--ease) infinite; }
@keyframes sheen { from { transform: translateX(-100%); } to { transform: translateX(100%); } }
@keyframes waitpulse { 0%,100% { box-shadow: 0 0 0 0 rgba(194,65,12,.0); } 50% { box-shadow: 0 0 0 8px rgba(194,65,12,.16); } }
.st-group { grid-column: span 2; background: var(--paper-2); border: 1px solid var(--line); border-radius: 13px; padding: 10px; }
.st-group-label { font-family: var(--mono); font-size: 10.5px; letter-spacing: .09em; text-transform: uppercase; color: var(--ink-3); padding: 2px 4px 8px; }
.st-group-list { list-style: none; display: grid; gap: 6px; }
.st-lane { min-height: 0; padding: 12px 12px 10px; flex-direction: row; align-items: baseline; gap: 10px; }
.st-lane .st-label { margin-top: 0; font-size: 14px; }

.st-detail { display: grid; grid-template-columns: auto 1fr; column-gap: 14px; align-items: baseline; margin: 14px 0 22px; padding: 16px 20px; background: var(--card); border: 1px solid var(--line); border-radius: 13px; min-height: 64px; }
.st-detail-kind { grid-row: 1 / span 2; font-family: var(--mono); font-size: 10.5px; letter-spacing: .09em; text-transform: uppercase; color: var(--ink-3); display: inline-flex; gap: 6px; align-items: center; }
.st-detail-kind:empty { display: none; }
.st-detail-label { font-size: 15.5px; }
.st-detail-label:empty { display: none; }
.st-detail-text { margin: 2px 0 0; color: var(--ink-2); font-size: 15px; grid-column: 2; }
.st-detail.is-gate { border-color: var(--accent); }
.st-detail.is-gate .st-detail-kind { color: var(--accent); }

/* walkthrough */
.walk { background: var(--console); color: var(--console-ink); border-radius: 20px; overflow: hidden; box-shadow: 0 40px 80px -40px rgba(19,21,24,.55); }
.walk-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 14px 18px 14px 22px; border-bottom: 1px solid var(--console-line); flex-wrap: wrap; }
.walk-title { display: inline-flex; align-items: center; gap: 10px; font-family: var(--mono); font-size: 11.5px; letter-spacing: .09em; text-transform: uppercase; color: var(--console-dim); }
.walk-dot { width: 8px; height: 8px; border-radius: 50%; background: #3B424B; }
.walk.is-running .walk-dot { background: #37D07A; box-shadow: 0 0 0 4px rgba(55,208,122,.16); }
.walk.is-waiting .walk-dot { background: var(--accent-2); box-shadow: 0 0 0 4px rgba(232,89,12,.2); }
.walk-controls { display: flex; align-items: center; gap: 10px; }
.walk-progress { font-family: var(--mono); font-size: 11.5px; color: var(--console-dim); letter-spacing: .04em; }
.walk-body { display: grid; grid-template-columns: .9fr 1.15fr; min-height: 470px; }
.walk-console { padding: 18px 20px 22px; border-right: 1px solid var(--console-line); font-family: var(--mono); font-size: 12.8px; line-height: 1.75; max-height: 520px; overflow-y: auto; scrollbar-width: thin; scrollbar-color: #2B3139 transparent; }
.pane-label { color: var(--console-dim); font-size: 10.5px; margin-bottom: 12px; }
.walk-console .pane-label { position: sticky; top: -18px; margin: -18px -20px 10px; padding: 18px 20px 8px; background: linear-gradient(var(--console) 75%, rgba(15,17,20,0)); z-index: 1; }
.walk-output .pane-label { color: var(--ink-3); }
.console-lines .ln { display: flex; gap: 10px; animation: lnin .28s var(--ease) both; }
.console-lines .ln i { font-style: normal; width: 12px; flex: none; color: #4C5561; }
.console-lines .ln.ok i { color: #37D07A; }
.console-lines .ln.ok { color: #E6EAEE; }
.console-lines .ln.flag i, .console-lines .ln.flag { color: #F2A65A; }
.console-lines .ln.hd { margin-top: 12px; color: #fff; font-weight: 600; letter-spacing: .02em; }
.console-lines .ln.hd:first-child { margin-top: 0; }
.console-lines .ln.hd i { color: var(--accent-2); }
.console-lines .ln.hd.hd-gate, .console-lines .ln.hd.hd-gate i { color: #FF8A4C; }
.console-lines .ln.end { margin-top: 14px; color: #37D07A; }
@keyframes lnin { from { opacity: 0; transform: translateX(-6px); } to { opacity: 1; transform: none; } }
.walk-output { background: var(--paper); color: var(--ink); padding: 18px 22px 24px; position: relative; }
.output-stage { position: relative; }
.idle { color: var(--ink-3); font-family: var(--serif); font-size: 1.5rem; line-height: 1.3; max-width: 26ch; margin-top: 30px; }
.walk-note { margin: 0; padding: 12px 22px 14px; font-size: 12.5px; color: var(--console-dim); border-top: 1px solid var(--console-line); }

/* output artifacts */
.art { background: var(--card); border: 1px solid var(--line); border-radius: 13px; padding: 18px 20px; animation: artin .45s var(--ease) both; }
@keyframes artin { from { opacity: 0; transform: translateY(8px) scale(.99); } to { opacity: 1; transform: none; } }
.art-title { font-family: var(--mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 12px; display: flex; justify-content: space-between; gap: 10px; }
.art .row-in { animation: rowin .35s var(--ease) both; }
@keyframes rowin { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
.kv { display: grid; grid-template-columns: max-content 1fr; gap: 8px 18px; margin: 0; font-size: 14.5px; }
.kv dt { color: var(--ink-3); }
.kv dd { margin: 0; }
.art ol, .art ul.plain { margin: 0; padding-left: 0; list-style: none; display: grid; gap: 8px; counter-reset: item; }
.art ol li, .art ul.plain li { display: flex; gap: 12px; font-size: 14.5px; padding: 9px 12px; border: 1px solid var(--line); border-radius: 9px; background: var(--paper); }
.art ol li::before { counter-increment: item; content: counter(item, decimal-leading-zero); font-family: var(--mono); font-size: 11.5px; color: var(--ink-3); padding-top: 2px; }
.art ul.plain li::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--ink-2); margin-top: 8px; flex: none; }
.tbl-wrap { overflow-x: auto; margin: 0 -4px; }
.art table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.art th { text-align: left; font-family: var(--mono); font-size: 10.5px; letter-spacing: .07em; text-transform: uppercase; color: var(--ink-3); font-weight: 500; padding: 0 8px 8px 4px; border-bottom: 1px solid var(--line); }
.art td { padding: 9px 8px 9px 4px; border-bottom: 1px solid var(--line); vertical-align: top; }
.art tr.hl td { background: var(--accent-soft); }
.art tr.hl td:first-child { box-shadow: inset 3px 0 0 var(--accent); }
.checks { list-style: none; margin: 0; padding: 0; display: grid; gap: 7px; }
.checks li { display: flex; gap: 10px; align-items: flex-start; font-size: 14.5px; }
.checks .ck { flex: none; width: 20px; height: 20px; border-radius: 50%; display: grid; place-items: center; font-size: 11px; font-weight: 700; margin-top: 1px; }
.checks .s-ok .ck { background: var(--ok-soft); color: var(--ok); }
.checks .s-flag .ck { background: var(--flag-soft); color: var(--flag); }
.checks .s-flag { color: var(--flag); }
.checks .s-fixed .ck { background: var(--ok-soft); color: var(--ok); }
.text-meta { margin-bottom: 12px; padding-bottom: 10px; border-bottom: 1px solid var(--line); }
.text-body { white-space: pre-wrap; font-size: 14.5px; line-height: 1.6; margin: 0; }
.caret::after { content: ""; display: inline-block; width: 7px; height: 1.05em; margin-left: 2px; vertical-align: -2px; background: var(--accent); animation: blink .9s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.doc-title { font-family: var(--serif); font-size: 1.6rem; line-height: 1.15; margin: 0 0 14px; }
.doc-sec { margin-top: 12px; }
.doc-sec h4 { margin: 0 0 4px; font-family: var(--mono); font-size: 10.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); font-weight: 500; }
.doc-sec p { margin: 0 0 4px; font-size: 14.5px; }
.email-head { display: grid; grid-template-columns: max-content 1fr; gap: 6px 14px; font-size: 14px; padding-bottom: 12px; border-bottom: 1px solid var(--line); margin-bottom: 12px; }
.email-head dt { color: var(--ink-3); }
.email-head dd { margin: 0; font-weight: 550; }
.gate { border: 1.5px solid var(--accent); box-shadow: 0 0 0 6px rgba(194,65,12,.08); }
.gate-wait { display: inline-flex; align-items: center; gap: 8px; color: var(--accent); }
.gate-wait::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); animation: blink 1s steps(1) infinite; }
.gate h4 { font-family: var(--serif); font-size: 1.7rem; font-weight: 400; margin: 2px 0 12px; line-height: 1.1; }
.gate .kv { margin-bottom: 14px; }
.gate-body { font-size: 14.5px; color: var(--ink-2); margin-bottom: 16px; }
.gate-done { display: flex; align-items: center; gap: 10px; color: var(--ok); font-weight: 600; font-size: 15px; }
.gate-done i { width: 22px; height: 22px; border-radius: 50%; background: var(--ok-soft); display: grid; place-items: center; font-style: normal; font-size: 12px; }
.gate.is-approved { border-color: var(--ok); box-shadow: 0 0 0 6px rgba(23,128,61,.08); }
.passes { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 14px; }
.passes span { font-family: var(--mono); font-size: 10.5px; letter-spacing: .05em; padding: 5px 8px; border-radius: 999px; border: 1px solid var(--line); color: var(--ink-3); transition: all .3s; }
.passes span.on { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.redact-text { font-size: 15.5px; line-height: 1.75; margin: 0; }
.rd { position: relative; border-radius: 4px; transition: background .3s; }
.rd .rd-new { display: none; }
.rd.is-hit { background: #FFE3A3; }
.rd.is-done .rd-old { display: none; }
.rd.is-done .rd-new { display: inline; background: var(--ink); color: var(--paper); padding: 1px 6px; border-radius: 4px; font-size: .92em; }

/* two-up notes, stats, before/after */
.two-up { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.note-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 26px 28px; }
.note-card p { margin: 0; font-size: 17px; color: var(--ink-2); }
.note-human { border-color: var(--accent); background: linear-gradient(180deg, var(--accent-soft), var(--card) 60%); }
.note-human .label-h { color: var(--accent); }
.results { padding-top: 60px; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--ink); }
.stat { padding: 22px 24px 0 0; }
.stat + .stat { padding-left: 24px; border-left: 1px solid var(--line); }
.stat-n { font-family: var(--serif); font-size: clamp(3rem, 5.4vw, 4.6rem); line-height: 1; letter-spacing: -.02em; }
.stat-label { margin: 10px 0 0; color: var(--ink-2); font-size: 15px; max-width: 28ch; }
.stats-note { margin: 22px 0 0; color: var(--ink-3); font-size: 14px; }
.gets { list-style: none; display: grid; gap: 0; border-top: 1px solid var(--ink); }
.gets li { padding: 16px 0 16px 34px; border-bottom: 1px solid var(--line); position: relative; font-size: 17px; }
.gets li::before { content: ""; position: absolute; left: 4px; top: 22px; width: 14px; height: 8px; border-left: 2px solid var(--ok); border-bottom: 2px solid var(--ok); transform: rotate(-45deg); }
.ba-head { display: flex; align-items: center; gap: 14px; margin-bottom: 16px; }
.ba-head .label-h { margin: 0; }
.tag-sample { font-size: 10.5px; color: var(--flag); border: 1px dashed var(--flag); border-radius: 999px; padding: 3px 9px; }
.ba { display: grid; grid-template-columns: 1fr auto 1fr; gap: 18px; align-items: stretch; }
.ba-card { margin: 0; border-radius: var(--r); padding: 24px 26px; }
.ba-card figcaption { display: flex; flex-direction: column; gap: 6px; font-size: 14px; color: var(--ink-3); margin-bottom: 14px; }
.ba-tag { font-family: var(--mono); font-size: 11px; letter-spacing: .09em; text-transform: uppercase; }
.ba-card p { margin: 0; font-size: 16.5px; line-height: 1.6; }
.ba-before { background: var(--paper-2); border: 1px solid var(--line); }
.ba-before p { color: var(--ink-3); }
.ba-after { background: var(--card); border: 1px solid var(--ink); box-shadow: 0 24px 44px -32px rgba(19,21,24,.45); }
.ba-after .ba-tag { color: var(--ok); }
.ba-arrow { align-self: center; font-size: 22px; color: var(--ink-3); }
.fit { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; }
.fit li { border: 1px solid var(--line-2); border-radius: 999px; padding: 9px 16px; font-size: 15px; background: var(--card); }
.stack { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.stack li { font-family: var(--mono); font-size: 12.5px; padding: 7px 12px; border-radius: 8px; background: var(--paper-2); border: 1px solid var(--line); }
.pdf-link { display: inline-flex; gap: 8px; font-weight: 550; font-size: 15px; text-decoration: none; border-bottom: 1px solid var(--ink); padding-bottom: 2px; }
.pdf-link:hover { color: var(--accent); border-color: var(--accent); }

.next-case { padding: 40px 0 90px; }
.next-link { display: grid; grid-template-columns: 1fr auto; grid-template-rows: auto auto; gap: 8px 30px; align-items: end; padding: 34px 0 0; border-top: 1px solid var(--ink); text-decoration: none; }
.next-label { font-family: var(--mono); font-size: 12px; letter-spacing: .09em; text-transform: uppercase; color: var(--ink-3); grid-column: 1 / -1; }
.next-title { font-family: var(--serif); font-size: clamp(2.2rem, 5vw, 4.2rem); line-height: 1; letter-spacing: -.02em; transition: color .2s; }
.next-num { font-family: var(--serif); font-size: clamp(1.6rem, 3vw, 2.4rem); color: var(--ink-3); }
.next-num small { font-family: var(--sans); font-size: 14px; }
.next-link:hover .next-title { color: var(--accent); }

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .nav { display: none; }
  .hero-grid, .section-head, .system-head, .case-hero-grid, .about-grid, .faq-grid, .cta-inner { grid-template-columns: 1fr; gap: 26px; }
  .hero-actions { justify-content: flex-start; }
  .how-grid { grid-template-columns: 1fr 1fr; }
  .more-grid { grid-template-columns: 1fr 1fr; }
  .card-feature .card-body { grid-template-columns: 1fr; gap: 10px; }
  .split { grid-template-columns: 1fr; gap: 6px; }
  .walk-body { grid-template-columns: 1fr; }
  .walk-console { border-right: 0; border-bottom: 1px solid var(--console-line); max-height: 240px; min-height: 160px; }
  .walk-output { min-height: 340px; }
}
@media (max-width: 680px) {
  body { font-size: 16px; }
  .wrap { padding: 0 20px; }
  .proof-grid { background-position: 20px 0; background-size: calc(100% - 40px) 1px; }
  .header-inner { gap: 12px; height: 60px; }
  .wordmark { font-size: 21px; }
  .header-actions .btn { display: none; }
  .hero { padding-top: 44px; }
  .proof-grid, .stats { grid-template-columns: 1fr; }
  .proof-item + .proof-item, .stat + .stat { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
  .proof-item, .stat { padding-bottom: 20px; }
  .cards, .more-grid, .how-grid, .two-up { grid-template-columns: 1fr; }
  .card-feature { grid-column: auto; }
  .ba { grid-template-columns: 1fr; }
  .ba-arrow { transform: rotate(90deg); justify-self: center; }
  .stations { grid-template-columns: 1fr 1fr; }
  .st-group { grid-column: 1 / -1; }
  .meta-row div + div { padding-left: 0; border-left: 0; }
  .meta-row { grid-template-columns: 1fr 1fr; gap: 0 16px; }
  .signal-labels { font-size: 9.5px; }
  .sl-b { display: none; }
  .footer-right { text-align: left; }
  .next-link { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
  [data-reveal] { opacity: 1; transform: none; }
  .sig-packet { display: none; }
}