/* ============================================================
   OCTG Hub — landing site
   System: precision-engineering / industrial-enterprise
   Type: Space Grotesk (display) · IBM Plex Sans (body) · IBM Plex Mono (labels)
   ============================================================ */

:root {
  /* light base (paper) */
  --paper:    #f3f5f7;
  --paper-2:  #ffffff;
  --paper-3:  #e9edf1;
  --line:     #dde3ea;
  --line-2:   #cbd3dc;

  --ink:      #0f141b;   /* headings */
  --ink-2:    #3b4754;   /* body */
  --ink-3:    #6c7884;   /* muted / labels */

  /* accents (shared chroma/lightness, varied hue) */
  --steel:      #2f6fb0;
  --steel-deep: #214f80;
  --steel-soft: #e4eef7;
  --amber:      #b5832b;
  --amber-soft: #f3e8cf;
  --ok:         #2c8d59;
  --danger:     #c04e3d;

  /* dark band */
  --d-bg:      #0b0f15;
  --d-bg-2:    #10151d;
  --d-surface: #161d27;
  --d-surface-2:#1d2531;
  --d-line:    rgba(255,255,255,.10);
  --d-line-2:  rgba(255,255,255,.18);
  --d-fg:      #eef2f6;
  --d-fg-2:    #a9b4c0;
  --d-fg-3:    #717d8a;
  --d-steel:   #5fa0d8;
  --d-amber:   #e0ab4d;

  --radius:   4px;
  --radius-lg:8px;
  --maxw:     1240px;
  --gutter:   clamp(20px, 5vw, 64px);

  --ff-display: "Space Grotesk", "Segoe UI", system-ui, sans-serif;
  --ff-body:    "IBM Plex Sans", system-ui, -apple-system, sans-serif;
  --ff-mono:    "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --ease: cubic-bezier(.22,.61,.36,1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink-2);
  font-family: var(--ff-body);
  font-size: 17px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1,h2,h3,h4 { font-family: var(--ff-display); color: var(--ink); font-weight: 600;
  line-height: 1.05; letter-spacing: -0.02em; margin: 0; text-wrap: balance; }

p { margin: 0; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* ---------- layout primitives ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding-inline: var(--gutter); }
.section { padding-block: clamp(72px, 10vw, 132px); position: relative; }
.section--tight { padding-block: clamp(48px, 6vw, 80px); }

.eyebrow {
  font-family: var(--ff-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--steel);
  font-weight: 500;
  display: inline-flex; align-items: center; gap: .6em;
}
.eyebrow::before {
  content: ""; width: 22px; height: 1px; background: currentColor; opacity: .6;
}
.eyebrow--center { justify-content: center; }

.h-display { font-size: clamp(2.6rem, 6.2vw, 5.1rem); }
.h2        { font-size: clamp(2rem, 4.2vw, 3.3rem); }
.lead      { font-size: clamp(1.12rem, 1.7vw, 1.4rem); line-height: 1.5; color: var(--ink-2); }

.section-head { max-width: 760px; }
.section-head .h2 { margin-top: 18px; }
.section-head .lead { margin-top: 22px; }
.section-head--center { margin-inline: auto; text-align: center; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .6em;
  font-family: var(--ff-body); font-weight: 500; font-size: .98rem;
  padding: 13px 22px; border-radius: var(--radius);
  border: 1px solid transparent; cursor: pointer;
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--steel); color: #fff; }
.btn--primary:hover { background: var(--steel-deep); }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--line-2); }
.btn--ghost:hover { border-color: var(--ink-3); background: var(--paper-2); }
.btn .arrow { transition: transform .2s var(--ease); }
.btn:hover .arrow { transform: translateX(3px); }

.btn--on-dark.btn--ghost { color: var(--d-fg); border-color: var(--d-line-2); }
.btn--on-dark.btn--ghost:hover { background: rgba(255,255,255,.06); border-color: rgba(255,255,255,.35); }

.link-arrow {
  display: inline-flex; align-items: center; gap: .5em;
  font-weight: 500; color: var(--steel);
  font-size: .95rem;
}
.link-arrow .arrow { transition: transform .2s var(--ease); }
.link-arrow:hover .arrow { transform: translateX(4px); }

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px var(--gutter);
  transition: background .3s var(--ease), border-color .3s var(--ease), padding .3s var(--ease);
  border-bottom: 1px solid transparent;
}
.nav--scrolled {
  background: rgba(243,245,247,.82);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  backdrop-filter: blur(18px) saturate(150%);
  border-bottom-color: var(--line);
  padding-block: 12px;
}
/* over dark hero */
.nav--on-dark { color: var(--d-fg); }
.nav--on-dark .brand-name { color: #fff; }
.nav--on-dark .nav-link { color: var(--d-fg-2); }
.nav--on-dark .nav-link:hover { color: #fff; }
.nav--on-dark .brand-mark { border-color: rgba(255,255,255,.3); }
.nav--on-dark.nav--scrolled { background: rgba(11,15,21,.7); border-bottom-color: var(--d-line); }

.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 34px; height: 34px; border: 1.5px solid var(--ink); border-radius: 3px;
  display: grid; place-items: center; position: relative; flex: none;
}
.brand-mark::before, .brand-mark::after {
  content: ""; position: absolute; border-radius: 50%;
}
.brand-mark::before { width: 18px; height: 18px; border: 1.5px solid currentColor; opacity: .9; }
.brand-mark::after  { width: 7px; height: 7px; background: var(--steel); }
.brand-name { font-family: var(--ff-display); font-weight: 600; font-size: 1.18rem;
  color: var(--ink); letter-spacing: -.01em; }
.brand-name b { color: var(--steel); font-weight: 600; }

.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-menu { display: flex; align-items: center; gap: 28px; }
.nav-link { font-size: .95rem; color: var(--ink-2); font-weight: 450;
  transition: color .18s var(--ease); }
.nav-link:hover { color: var(--ink); }

.nav-toggle { display: none; }

@media (max-width: 900px) {
  .nav-menu { display: none; }
  .nav-links { gap: 14px; }
}

/* ============================================================
   HERO  (dark band)
   ============================================================ */
.hero {
  background: var(--d-bg);
  color: var(--d-fg);
  position: relative;
  overflow: hidden;
  padding-top: clamp(120px, 16vh, 180px);
  padding-bottom: clamp(60px, 8vw, 110px);
}
.hero::before {  /* engineering grid */
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--d-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--d-line) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(120% 90% at 75% 8%, #000 30%, transparent 78%);
  opacity: .5;
}
.hero::after {  /* steel glow */
  content: ""; position: absolute; width: 720px; height: 720px;
  right: -180px; top: -260px; border-radius: 50%;
  background: radial-gradient(circle, rgba(47,111,176,.32), transparent 62%);
  pointer-events: none;
}
.hero .wrap { position: relative; z-index: 1; }
.hero-grid {
  display: grid; grid-template-columns: 1.04fr 1fr; gap: clamp(36px, 5vw, 72px);
  align-items: center;
}
.hero-eyebrow { color: var(--d-steel); }
.hero h1 { color: #fff; margin-top: 22px; }
.hero h1 .accent { color: var(--d-steel); }
.hero-sub { color: var(--d-fg-2); margin-top: 26px; max-width: 32em; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 36px; }
.hero-trust {
  margin-top: 44px; padding-top: 26px; border-top: 1px solid var(--d-line);
  display: flex; flex-wrap: wrap; gap: 14px 30px; align-items: center;
}
.hero-trust .lbl { font-family: var(--ff-mono); font-size: .68rem; letter-spacing: .16em;
  text-transform: uppercase; color: var(--d-fg-3); }
.stdpill {
  font-family: var(--ff-mono); font-size: .74rem; color: var(--d-fg);
  display: inline-flex; align-items: center; gap: .5em;
}
.stdpill .dot { width: 5px; height: 5px; border-radius: 50%; background: var(--d-steel); }

@media (max-width: 940px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-viz-wrap { order: 2; }
}

/* ---------- interactive design-limit plot ---------- */
.viz-card {
  background: linear-gradient(180deg, var(--d-surface), var(--d-bg-2));
  border: 1px solid var(--d-line-2);
  border-radius: var(--radius-lg);
  padding: 18px 18px 14px;
  box-shadow: 0 30px 80px -30px rgba(0,0,0,.7);
}
.viz-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px;
  margin-bottom: 8px; }
.viz-title { font-family: var(--ff-mono); font-size: .72rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--d-fg-3); }
.viz-title b { color: var(--d-fg); font-weight: 500; display: block; font-size: .82rem;
  letter-spacing: .04em; margin-top: 3px; }
.viz-sf {
  text-align: right; font-family: var(--ff-mono);
}
.viz-sf .sf-num { font-size: 1.6rem; font-weight: 500; line-height: 1; color: var(--ok);
  transition: color .2s; font-variant-numeric: tabular-nums; }
.viz-sf .sf-num.fail { color: var(--danger); }
.viz-sf .sf-lbl { font-size: .62rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--d-fg-3); margin-top: 4px; }
#limitPlot { width: 100%; height: auto; display: block; touch-action: none; cursor: grab; }
#limitPlot.grabbing { cursor: grabbing; }
.viz-foot { display: flex; align-items: center; justify-content: space-between; gap: 10px;
  margin-top: 6px; padding-top: 10px; border-top: 1px solid var(--d-line);
  font-family: var(--ff-mono); font-size: .68rem; color: var(--d-fg-3); }
.viz-foot .reads { display: flex; gap: 16px; flex-wrap: wrap; }
.viz-foot .reads span b { color: var(--d-fg); font-weight: 500; }
.viz-hint { color: var(--d-amber); display: inline-flex; align-items: center; gap: .5em; }
.viz-hint::before { content: "⊕"; }

/* ============================================================
   marquee / trust strip
   ============================================================ */
.strip {
  background: var(--ink); color: var(--d-fg-2);
  padding-block: 20px; overflow: hidden;
}
.strip-inner { display: flex; gap: 56px; align-items: center; width: max-content;
  animation: marquee 38s linear infinite; }
.strip:hover .strip-inner { animation-play-state: paused; }
.strip-item { font-family: var(--ff-mono); font-size: .8rem; letter-spacing: .08em;
  color: var(--d-fg-2); display: inline-flex; align-items: center; gap: 12px;
  white-space: nowrap; }
.strip-item .sep { color: var(--steel); }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ============================================================
   PROBLEM
   ============================================================ */
.prob-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px;
  background: var(--line); border: 1px solid var(--line); border-radius: var(--radius-lg);
  overflow: hidden; margin-top: 56px; }
.prob-cell { background: var(--paper-2); padding: 34px 32px 38px; transition: background .2s; }
.prob-cell:hover { background: var(--paper-3); }
.prob-cell .num { font-family: var(--ff-mono); font-size: .74rem; color: var(--ink-3);
  letter-spacing: .1em; }
.prob-cell h3 { font-size: 1.32rem; margin: 16px 0 10px; }
.prob-cell p { color: var(--ink-2); font-size: .98rem; }
@media (max-width: 720px){ .prob-grid { grid-template-columns: 1fr; } }

/* ============================================================
   MODULES
   ============================================================ */
.mod-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 22px; margin-top: 56px; }
.mod {
  background: var(--paper-2); border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 30px 30px 32px; position: relative; overflow: hidden;
  transition: border-color .25s var(--ease), transform .25s var(--ease), box-shadow .25s var(--ease);
}
.mod:hover { border-color: var(--line-2); transform: translateY(-3px);
  box-shadow: 0 24px 50px -34px rgba(15,20,27,.4); }
.mod::after { content: ""; position: absolute; left: 0; top: 0; height: 3px; width: 0;
  background: var(--steel); transition: width .35s var(--ease); }
.mod:hover::after { width: 100%; }
.mod .modnum { font-family: var(--ff-mono); font-size: .72rem; color: var(--steel);
  letter-spacing: .1em; }
.mod h3 { font-size: 1.4rem; margin: 14px 0 12px; }
.mod p { font-size: .97rem; color: var(--ink-2); }
.mod .modtags { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 18px; }
.tag {
  font-family: var(--ff-mono); font-size: .68rem; letter-spacing: .04em;
  color: var(--ink-3); border: 1px solid var(--line-2); border-radius: 100px;
  padding: 4px 11px;
}
.tag--steel { color: var(--steel); border-color: color-mix(in srgb, var(--steel) 40%, transparent);
  background: var(--steel-soft); }
.tag--amber { color: var(--amber); border-color: color-mix(in srgb, var(--amber) 40%, transparent);
  background: var(--amber-soft); }
.mod .modicon { width: 38px; height: 38px; }
.mod-span-6 { grid-column: span 6; }
.mod-span-4 { grid-column: span 4; }
.mod-span-12 { grid-column: span 12; }
@media (max-width: 900px){
  .mod-span-6,.mod-span-4 { grid-column: span 6; }
}
@media (max-width: 620px){
  .mod-grid { grid-template-columns: 1fr; }
  .mod-span-6,.mod-span-4,.mod-span-12 { grid-column: 1 / -1; }
}

/* ---------- lifecycle flow band ---------- */
.lifecycle {
  margin-top: 52px; background: var(--d-bg); color: var(--d-fg);
  border-radius: var(--radius-lg); padding: 34px clamp(20px,3vw,38px) 28px;
  position: relative; overflow: hidden; border: 1px solid var(--d-line-2);
}
.lifecycle::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--d-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--d-line) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(120% 120% at 50% -10%, #000 30%, transparent 75%); opacity: .45;
}
.life-head { position: relative; display: flex; align-items: baseline; justify-content: space-between;
  gap: 12px; margin-bottom: 26px; flex-wrap: wrap; }
.life-head .lh-title { font-family: var(--ff-mono); font-size: .72rem; letter-spacing: .14em;
  text-transform: uppercase; color: var(--d-steel); }
.life-head .lh-sub { font-family: var(--ff-mono); font-size: .72rem; color: var(--d-fg-3); }
.life-track { position: relative; display: flex; align-items: stretch; gap: 6px; }
.life-node { flex: 1; min-width: 0; text-align: center; padding: 6px 4px; }
.life-step { font-family: var(--ff-mono); font-size: .62rem; letter-spacing: .14em;
  text-transform: uppercase; color: var(--d-fg-3); }
.life-mod { font-family: var(--ff-display); font-size: clamp(.95rem, 1.4vw, 1.12rem); color: #fff;
  margin-top: 7px; letter-spacing: -.01em; }
.life-mod .iq { color: var(--d-steel); }
.life-verb { font-family: var(--ff-mono); font-size: .64rem; color: var(--d-fg-2); margin-top: 6px; }
.life-arrow { flex: none; align-self: center; color: var(--d-steel); font-size: 1.05rem; opacity: .65; }
.life-cap { position: relative; text-align: center; margin-top: 24px; padding-top: 18px;
  border-top: 1px solid var(--d-line); font-family: var(--ff-mono); font-size: .74rem;
  letter-spacing: .04em; color: var(--d-fg-2); }
.life-cap b { color: var(--d-steel); font-weight: 500; }
@media (max-width: 760px){
  .life-track { flex-direction: column; gap: 4px; }
  .life-node { padding: 12px 4px; }
  .life-arrow { transform: rotate(90deg); }
}

/* ---------- module suite cards ---------- */
.suite-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 22px; margin-top: 22px; }
.smod {
  background: var(--paper-2); border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 30px 30px 0; display: flex; flex-direction: column; position: relative; overflow: hidden;
  transition: border-color .25s var(--ease), transform .25s var(--ease), box-shadow .25s var(--ease);
}
.smod:hover { border-color: var(--line-2); transform: translateY(-3px);
  box-shadow: 0 24px 50px -34px rgba(15,20,27,.4); }
.smod::after { content: ""; position: absolute; left: 0; top: 0; height: 3px; width: 0;
  background: var(--steel); transition: width .35s var(--ease); }
.smod:hover::after { width: 100%; }
.smod-head { display: flex; align-items: center; gap: 14px; }
.smod-ic { width: 44px; height: 44px; flex: none; border: 1px solid color-mix(in srgb,var(--steel) 32%,transparent);
  border-radius: 9px; display: grid; place-items: center; color: var(--steel); background: var(--steel-soft); }
.smod-ic svg { width: 24px; height: 24px; }
.smod-cat { font-family: var(--ff-mono); font-size: .66rem; letter-spacing: .13em;
  text-transform: uppercase; color: var(--ink-3); }
.smod-name { font-family: var(--ff-display); font-size: 1.5rem; color: var(--ink); margin-top: 3px;
  letter-spacing: -.015em; }
.smod-name .iq { color: var(--steel); }
.smod-tag { font-size: .98rem; color: var(--ink-2); margin-top: 16px; }
.smod-feats { list-style: none; margin: 18px 0 0; padding: 0; display: grid; gap: 9px; }
.smod-feats li { font-size: .9rem; color: var(--ink-2); padding-left: 22px; position: relative; }
.smod-feats li::before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--steel);
  font-family: var(--ff-mono); font-size: .8rem; }
.smod-buyer { margin-top: auto; border-top: 1px solid var(--line); padding: 16px 0;
  display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.smod-buyer .bk { font-family: var(--ff-mono); font-size: .62rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--ink-3); flex: none; }
.smod-buyer .bv { font-size: .86rem; color: var(--ink); font-weight: 500; text-align: right; }
.s-6 { grid-column: span 6; }
.s-12 { grid-column: span 12; }
/* foundation (CatalogIQ) */
.smod--found { background: linear-gradient(180deg, var(--steel-soft), var(--paper-2)); }
.smod--found .smod-body { display: grid; grid-template-columns: 1.1fr 1.4fr; gap: 30px; }
.smod--found .smod-feats { grid-template-columns: 1fr 1fr; gap: 9px 24px; align-content: start; }
.smod-ribbon { position: absolute; top: 0; right: 0; font-family: var(--ff-mono); font-size: .6rem;
  letter-spacing: .14em; text-transform: uppercase; color: var(--steel); background: var(--steel-soft);
  border-left: 1px solid color-mix(in srgb,var(--steel) 30%,transparent);
  border-bottom: 1px solid color-mix(in srgb,var(--steel) 30%,transparent);
  padding: 7px 14px; border-bottom-left-radius: var(--radius); }
@media (max-width: 900px){ .s-6 { grid-column: 1 / -1; } }
@media (max-width: 700px){
  .suite-grid { grid-template-columns: 1fr; }
  .s-6, .s-12 { grid-column: 1 / -1; }
  .smod--found .smod-body { grid-template-columns: 1fr; gap: 18px; }
}
@media (max-width: 480px){ .smod--found .smod-feats { grid-template-columns: 1fr; } }

/* spotlight (parallel validation inside TubularIQ) */
.spotlight { margin-top: 22px; }
.spotlight .modnum { color: var(--steel); }

/* feature module (parallel validation) wide layout */
.feature-mod { display: grid; grid-template-columns: 1fr 1fr; gap: 0; align-items: stretch; }
.feature-mod .fm-copy { padding: 38px 38px 40px; }
.feature-mod .fm-visual { border-left: 1px solid var(--line); background: var(--paper-3);
  padding: 30px; display: flex; flex-direction: column; justify-content: center; }
@media (max-width: 760px){
  .feature-mod { grid-template-columns: 1fr; }
  .feature-mod .fm-visual { border-left: 0; border-top: 1px solid var(--line); }
}

/* diff (excel vs system) */
.diff { display: grid; gap: 10px; }
.diff-row { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 10px; align-items: center;
  font-family: var(--ff-mono); font-size: .8rem; }
.diff-row.head { color: var(--ink-3); font-size: .68rem; letter-spacing: .1em;
  text-transform: uppercase; }
.diff-cell { background: var(--paper-2); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 9px 12px; }
.diff-cell.label { background: transparent; border: 0; padding-left: 0; color: var(--ink-2); }
.diff-cell .v { color: var(--ink); font-weight: 500; }
.diff-cell.match { border-color: color-mix(in srgb, var(--ok) 40%, transparent); }
.diff-cell.match .v { color: var(--ok); }
.diff-delta { font-size: .68rem; color: var(--ok); display: inline-flex; align-items: center; gap: 4px; }

/* ============================================================
   AI BOUNDARY  (dark band)
   ============================================================ */
.boundary { background: var(--d-bg); color: var(--d-fg); position: relative; overflow: hidden; }
.boundary::before {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(circle at 50% 0%, rgba(47,111,176,.16), transparent 60%);
}
.boundary .wrap { position: relative; }
.boundary .eyebrow { color: var(--d-steel); }
.boundary h2 { color: #fff; }
.boundary .lead { color: var(--d-fg-2); }
.boundary-diagram {
  margin-top: 64px; display: grid; grid-template-columns: 1fr auto 1fr; gap: 0; align-items: stretch;
  border: 1px solid var(--d-line-2); border-radius: var(--radius-lg); overflow: hidden;
}
.bd-side { padding: 36px 34px; }
.bd-side .bd-kicker { font-family: var(--ff-mono); font-size: .7rem; letter-spacing: .14em;
  text-transform: uppercase; }
.bd-side h3 { color: #fff; font-size: 1.5rem; margin: 14px 0 16px; }
.bd-side ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 11px; }
.bd-side li { display: flex; gap: 11px; font-size: .96rem; color: var(--d-fg-2); }
.bd-side li .mk { font-family: var(--ff-mono); flex: none; }
.bd-ai { background: var(--d-surface); }
.bd-ai .bd-kicker { color: var(--d-amber); }
.bd-ai li .mk { color: var(--d-amber); }
.bd-math { background: linear-gradient(180deg, rgba(47,111,176,.16), var(--d-surface-2)); }
.bd-math .bd-kicker { color: var(--d-steel); }
.bd-math li .mk { color: var(--d-steel); }
.bd-wall {
  width: 92px; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 14px; background: var(--d-bg-2); border-inline: 1px solid var(--d-line-2);
  position: relative;
}
.bd-wall .wall-label { writing-mode: vertical-rl; font-family: var(--ff-mono); font-size: .64rem;
  letter-spacing: .22em; text-transform: uppercase; color: var(--d-fg-3); }
.bd-wall .barrier { position: absolute; inset: 0;
  background: repeating-linear-gradient(180deg, transparent 0 13px, var(--d-line) 13px 14px); opacity:.5;}
.bd-flow { font-family: var(--ff-mono); font-size: 1.1rem; color: var(--d-amber); z-index:1; }
@media (max-width: 820px){
  .boundary-diagram { grid-template-columns: 1fr; }
  .bd-wall { width: auto; height: 64px; flex-direction: row; border-inline: 0;
    border-block: 1px solid var(--d-line-2); }
  .bd-wall .wall-label { writing-mode: horizontal-tb; }
}
.bd-principle { margin-top: 40px; text-align: center; font-family: var(--ff-display);
  font-size: clamp(1.3rem, 2.6vw, 2rem); color: #fff; max-width: 22em; margin-inline: auto;
  line-height: 1.25; }
.bd-principle .accent { color: var(--d-steel); }

/* ============================================================
   ROADMAP
   ============================================================ */
.roadmap-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0;
  margin-top: 56px; border-top: 1px solid var(--line); }
.phase { padding: 30px 26px 8px; border-right: 1px solid var(--line); position: relative; }
.phase:last-child { border-right: 0; }
.phase::before { content: ""; position: absolute; top: -1px; left: 0; height: 2px; width: 100%;
  background: var(--steel); transform: scaleX(var(--p,.25)); transform-origin: left;
  transition: transform .6s var(--ease); }
.phase .ph-tag { font-family: var(--ff-mono); font-size: .72rem; letter-spacing: .08em;
  color: var(--steel); }
.phase .ph-when { font-family: var(--ff-mono); font-size: .68rem; color: var(--ink-3);
  margin-top: 4px; }
.phase h3 { font-size: 1.16rem; margin: 16px 0 12px; }
.phase ul { list-style: none; margin: 0 0 24px; padding: 0; display: grid; gap: 9px; }
.phase li { font-size: .9rem; color: var(--ink-2); padding-left: 16px; position: relative; }
.phase li::before { content: ""; position: absolute; left: 0; top: .65em; width: 5px; height: 5px;
  background: var(--line-2); border-radius: 50%; }
.phase.now { background: var(--paper-2); }
.phase.now .ph-tag::after { content: " · NOW"; color: var(--amber); }
@media (max-width: 860px){
  .roadmap-grid { grid-template-columns: 1fr 1fr; }
  .phase:nth-child(2){ border-right: 0; }
  .phase { border-bottom: 1px solid var(--line); }
}
@media (max-width: 540px){
  .roadmap-grid { grid-template-columns: 1fr; }
  .phase { border-right: 0; }
}

/* ============================================================
   CUSTOMERS
   ============================================================ */
.cust-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 20px; margin-top: 52px; }
.cust {
  border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 26px 24px 28px;
  background: var(--paper-2); transition: border-color .2s, background .2s;
}
.cust:hover { border-color: var(--steel); background: var(--steel-soft); }
.cust .ci { width: 30px; height: 30px; color: var(--steel); }
.cust h4 { font-size: 1.06rem; margin: 16px 0 8px; }
.cust p { font-size: .9rem; color: var(--ink-2); }
.cust .ctag { font-family: var(--ff-mono); font-size: .64rem; letter-spacing: .1em;
  text-transform: uppercase; color: var(--amber); margin-top: 14px; display: block; }
@media (max-width: 900px){ .cust-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px){ .cust-grid { grid-template-columns: 1fr; } }

/* ============================================================
   CTA  (dark band)
   ============================================================ */
.cta { background: var(--d-bg); color: var(--d-fg); position: relative; overflow: hidden; }
.cta::before { content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--d-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--d-line) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(80% 120% at 50% 120%, #000 20%, transparent 70%); opacity:.5;}
.cta .wrap { position: relative; text-align: center; }
.cta h2 { color: #fff; }
.cta .lead { color: var(--d-fg-2); margin: 22px auto 0; max-width: 34em; }
.cta-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-top: 38px; }
.cta .btn--primary { background: var(--d-steel); color: #06121e; }
.cta .btn--primary:hover { background: #7ab2e2; }
.cta-note { font-family: var(--ff-mono); font-size: .72rem; color: var(--d-fg-3);
  margin-top: 26px; letter-spacing: .04em; }

/* ============================================================
   FOOTER
   ============================================================ */
.footer { background: var(--d-bg-2); color: var(--d-fg-2); padding-block: 64px 30px; }
.footer .wrap { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 40px; }
.footer .brand-name { color: #fff; }
.footer .brand-mark { border-color: rgba(255,255,255,.4); color: #fff; }
.foot-about { color: var(--d-fg-3); font-size: .92rem; margin-top: 18px; max-width: 30em; }
.foot-col h5 { font-family: var(--ff-mono); font-size: .7rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--d-fg-3); margin: 0 0 16px; font-weight: 500; }
.foot-col a { display: block; font-size: .92rem; color: var(--d-fg-2); padding: 5px 0;
  transition: color .18s; }
.foot-col a:hover { color: #fff; }
.foot-bottom { border-top: 1px solid var(--d-line); margin-top: 48px; padding-top: 22px;
  display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap;
  font-family: var(--ff-mono); font-size: .72rem; color: var(--d-fg-3); }
@media (max-width: 760px){ .footer .wrap { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px){ .footer .wrap { grid-template-columns: 1fr; } }

/* ============================================================
   reveal animation
   ============================================================ */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .07s; }
.reveal.d2 { transition-delay: .14s; }
.reveal.d3 { transition-delay: .21s; }
@media (prefers-reduced-motion: reduce){
  .reveal { opacity: 1; transform: none; transition: none; }
  .strip-inner { animation: none; }
  html { scroll-behavior: auto; }
}