/* ============================================================
   STEADY LAB — AI consulting / engineering
   GRIFFINSTEPH LLC · steadylab.co
   Direction: tech-clean / scientific paper / dark mode
   ============================================================ */

:root {
  --bg: #0A0B0D;
  --bg-soft: #14161A;
  --bg-elev: #1B1E24;
  --surface: #1F232A;
  --paper: #FFFFFF;
  --ink: #F2F4F7;
  --ink-soft: #C9CED8;
  --ink-dim: #8B92A3;
  --ink-mute: #5A6271;
  --line: #2A2F38;
  --line-soft: #1F232A;
  --line-strong: #3A4150;
  --lab: #B5E853;
  --lab-deep: #8FBE2F;
  --lab-soft: rgba(181,232,83,0.12);
  --maxw: 1320px;
  --r-md: 6px;
  --r-sm: 4px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg); color: var(--ink-soft);
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 14.5px; line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body.no-scroll { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; font-size: inherit; }
img, svg { display: block; max-width: 100%; }
ul, ol { list-style: none; }
input, textarea, select { font-family: inherit; }

.mono { font-family: 'JetBrains Mono', ui-monospace, monospace; }
.serif { font-family: 'Fraunces', Georgia, serif; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }
.vh { position: absolute !important; width: 1px !important; height: 1px !important; padding: 0 !important; margin: -1px !important; overflow: hidden !important; clip: rect(0,0,0,0) !important; white-space: nowrap !important; border: 0 !important; }

/* ========== TOP BAR ========== */
.topbar {
  background: var(--bg-soft);
  border-bottom: 1px solid var(--line);
  padding: 8px 24px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--ink-mute);
  display: flex;
  justify-content: space-between;
  align-items: center;
  letter-spacing: .03em;
}
.topbar .left, .topbar .right { display: flex; gap: 16px; align-items: center; }
.topbar .pulse {
  width: 7px; height: 7px;
  background: var(--lab);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
.topbar .pulse-text { color: var(--lab); }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.3; } }
.topbar .sep { opacity: .35; }

/* ========== NAV ========== */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(10, 11, 13, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-row {
  max-width: var(--maxw); margin: 0 auto;
  padding: 16px 28px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px;
}
.nav-left { display: flex; align-items: center; gap: 36px; }
.logo {
  font-family: 'JetBrains Mono', monospace;
  font-size: 16px; font-weight: 500;
  color: var(--ink);
  letter-spacing: -.005em;
  white-space: nowrap;
  display: inline-flex; align-items: center; gap: 8px;
}
.logo .square {
  width: 14px; height: 14px;
  background: var(--lab);
  display: inline-block;
}
.nav-links { display: flex; gap: 28px; }
.nav-links a {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--ink-dim);
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: color .2s, border-color .2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--lab); border-bottom-color: var(--lab); }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.nav-cta {
  padding: 9px 16px;
  background: var(--lab); color: var(--bg);
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px; font-weight: 500;
  border-radius: var(--r-sm);
  transition: background .2s;
}
.nav-cta:hover { background: var(--lab-deep); }
.icon-btn {
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--r-sm);
  transition: background .2s;
}
.icon-btn:hover { background: var(--bg-elev); }
.icon-btn svg { width: 20px; height: 20px; stroke: var(--ink); stroke-width: 1.7; fill: none; }
.icon-btn.burger { display: none; }

@media (max-width: 1024px) {
  .nav-links { display: none; }
  .nav-cta { display: none; }
  .icon-btn.burger { display: flex !important; }
}

/* ========== DRAWER ========== */
.drawer-bg {
  position: fixed; inset: 0;
  background: rgba(10,11,13,.7);
  z-index: 90;
  opacity: 0; pointer-events: none;
  transition: opacity .25s;
}
.drawer-bg.open { opacity: 1; pointer-events: auto; }
.drawer {
  position: fixed; top: 0; right: 0; bottom: 0;
  width: min(88vw, 360px);
  background: var(--bg-soft);
  border-left: 1px solid var(--line);
  z-index: 100;
  transform: translateX(100%);
  transition: transform .3s cubic-bezier(.4,0,.2,1);
  display: flex; flex-direction: column;
}
.drawer.open { transform: translateX(0); }
.drawer-head {
  padding: 16px 22px;
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--line);
}
.drawer-close {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--r-sm);
  background: var(--bg-elev);
}
.drawer-close svg { width: 18px; height: 18px; stroke: var(--ink); stroke-width: 2; fill: none; }
.drawer-nav { padding: 20px 0; flex: 1; overflow-y: auto; }
.drawer-nav a {
  display: block; padding: 16px 22px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 16px;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line-soft);
  transition: color .2s, background .2s;
}
.drawer-nav a:hover { color: var(--lab); background: var(--bg-elev); }
.drawer-foot {
  padding: 22px;
  border-top: 1px solid var(--line);
}
.drawer-foot .btn { width: 100%; justify-content: center; }

/* ========== BUTTONS ========== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 24px;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500; font-size: 13.5px;
  border-radius: var(--r-sm); border: 1px solid transparent;
  cursor: pointer; transition: all .2s;
}
.btn-primary { background: var(--lab); color: var(--bg); }
.btn-primary:hover { background: var(--lab-deep); }
.btn-outline { background: transparent; color: var(--ink); border-color: var(--line-strong); }
.btn-outline:hover { border-color: var(--lab); color: var(--lab); }
.btn-ghost { background: var(--bg-elev); color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { background: var(--surface); border-color: var(--line-strong); }
.btn-block { width: 100%; }
.btn .arr { transition: transform .2s; display: inline-block; }
.btn:hover .arr { transform: translateX(3px); }

/* ========== HERO ========== */
.hero {
  padding: 80px 0 96px;
  border-bottom: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.015) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.015) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}
.hero-inner {
  max-width: var(--maxw); margin: 0 auto;
  padding: 0 28px;
  position: relative; z-index: 2;
}
.hero-meta {
  display: grid; grid-template-columns: 1fr auto;
  gap: 24px;
  margin-bottom: 56px;
  padding-bottom: 16px;
  border-bottom: 1px dashed var(--line);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  color: var(--ink-mute);
}
.hero-meta .docref { color: var(--lab); }

.hero h1 {
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: clamp(44px, 6.5vw, 84px);
  line-height: 1.02;
  letter-spacing: -.04em;
  color: var(--ink);
  margin-bottom: 32px;
  max-width: 1100px;
}
.hero h1 .lab-accent { color: var(--lab); }
.hero h1 em {
  font-family: 'Fraunces', serif;
  font-style: italic;
  font-weight: 400;
  color: var(--ink-dim);
}

.hero-bottom {
  display: grid; grid-template-columns: 2fr 1fr;
  gap: 56px; align-items: end;
  padding-top: 28px;
  border-top: 1px dashed var(--line);
}
.hero-bottom .lead {
  font-size: 17px; color: var(--ink-soft); line-height: 1.6;
  max-width: 620px;
}
.hero-bottom .lead em { font-family: 'Fraunces', serif; font-style: italic; color: var(--ink-dim); }
.hero-cta { display: flex; gap: 10px; flex-wrap: wrap; justify-content: flex-end; align-items: center; }

@media (max-width: 900px) {
  .hero { padding: 56px 0 64px; }
  .hero h1 { font-size: clamp(36px, 8vw, 56px); }
  .hero-meta { grid-template-columns: 1fr; }
  .hero-bottom { grid-template-columns: 1fr; gap: 24px; }
  .hero-cta { justify-content: flex-start; }
}

/* ========== METRICS GRID ========== */
.metrics {
  background: var(--bg-soft);
  border-bottom: 1px solid var(--line);
  padding: 48px 0;
}
.metrics-inner {
  max-width: var(--maxw); margin: 0 auto;
  padding: 0 28px;
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 0;
}
.metric {
  padding: 0 32px;
  border-right: 1px dashed var(--line);
  display: flex; flex-direction: column; gap: 6px;
}
.metric:first-child { padding-left: 0; }
.metric:last-child { border-right: none; padding-right: 0; }
.metric .label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px;
  color: var(--ink-mute);
  letter-spacing: .08em;
  text-transform: uppercase;
}
.metric .num {
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: 38px;
  letter-spacing: -.03em;
  color: var(--ink);
  line-height: 1;
}
.metric .num .small { font-size: 22px; color: var(--ink-dim); }
.metric .num .lab-accent { color: var(--lab); }
.metric .delta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--lab);
}
.metric .delta::before { content: '↑ '; }
@media (max-width: 900px) {
  .metrics-inner { grid-template-columns: 1fr 1fr; gap: 32px 0; }
  .metric { border-right: none; padding: 0 16px; }
  .metric:nth-child(2n) { padding-right: 0; }
  .metric:nth-child(2n+1) { padding-left: 0; }
}
@media (max-width: 480px) {
  .metrics-inner { grid-template-columns: 1fr; gap: 24px; }
  .metric { padding: 0; }
}

/* ========== SECTION HEAD ========== */
.sec-head {
  max-width: var(--maxw); margin: 0 auto;
  padding: 96px 28px 40px;
  display: grid; grid-template-columns: 200px 1fr;
  gap: 48px; align-items: end;
}
.sec-head .index {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  color: var(--lab);
  letter-spacing: .08em;
  text-transform: uppercase;
}
.sec-head .head {
  display: flex; flex-direction: column; gap: 16px;
}
.sec-head h2 {
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: clamp(36px, 4.8vw, 56px);
  line-height: 1.02;
  letter-spacing: -.035em;
  color: var(--ink);
}
.sec-head h2 em {
  font-family: 'Fraunces', serif;
  font-style: italic;
  font-weight: 400;
  color: var(--ink-dim);
}
.sec-head p {
  font-size: 16px; color: var(--ink-dim); line-height: 1.65;
  max-width: 600px;
}
@media (max-width: 768px) {
  .sec-head { grid-template-columns: 1fr; gap: 16px; padding: 56px 28px 28px; }
}

/* ========== CAPABILITIES (services) ========== */
.capabilities {
  max-width: var(--maxw); margin: 0 auto;
  padding: 0 28px 96px;
}
.cap-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.cap {
  padding: 32px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--bg-soft);
  display: flex; flex-direction: column;
  transition: background .25s;
  position: relative;
}
.cap::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 1px;
  background: transparent;
  transition: background .25s;
}
.cap:hover { background: var(--bg-elev); }
.cap:hover::before { background: var(--lab); }
.cap .ref {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--ink-mute);
  letter-spacing: .04em;
  margin-bottom: 24px;
}
.cap h3 {
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: 22px;
  letter-spacing: -.02em;
  line-height: 1.2;
  color: var(--ink);
  margin-bottom: 14px;
}
.cap p {
  color: var(--ink-dim);
  font-size: 14px;
  line-height: 1.65;
  margin-bottom: 28px;
  flex: 1;
}
.cap .ftr {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 18px;
  border-top: 1px dashed var(--line);
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--ink-mute);
}
.cap .ftr .runtime { color: var(--lab); }

@media (max-width: 1024px) { .cap-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .cap-grid { grid-template-columns: 1fr; } }

/* ========== DIAGRAM SECTION ========== */
.diagram {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--bg-soft);
  padding: 96px 0;
}
.diagram-inner {
  max-width: var(--maxw); margin: 0 auto;
  padding: 0 28px;
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 64px; align-items: center;
}
.diagram .text .index {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  color: var(--lab);
  letter-spacing: .08em;
  margin-bottom: 16px;
  text-transform: uppercase;
}
.diagram h3 {
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1.05;
  letter-spacing: -.03em;
  color: var(--ink);
  margin-bottom: 24px;
}
.diagram h3 em {
  font-family: 'Fraunces', serif; font-style: italic; font-weight: 400;
  color: var(--lab);
}
.diagram p {
  font-size: 16px; color: var(--ink-dim); line-height: 1.7;
  max-width: 480px;
  margin-bottom: 18px;
}
.diagram .specs {
  margin-top: 24px;
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.diagram .spec {
  padding-top: 14px;
  border-top: 1px dashed var(--line);
}
.diagram .spec .k {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px;
  color: var(--ink-mute);
  letter-spacing: .06em;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.diagram .spec .v {
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  color: var(--ink);
}

.diagram .visual {
  aspect-ratio: 1;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}
.diagram .visual::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 32px 32px;
}
.diagram-svg {
  position: absolute;
  inset: 12%;
  width: 76%;
  height: 76%;
}

@media (max-width: 900px) {
  .diagram-inner { grid-template-columns: 1fr; gap: 32px; }
}

/* ========== CASE STUDIES ========== */
.cases {
  max-width: var(--maxw); margin: 0 auto;
  padding: 0 28px 96px;
}
.cases-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 24px;
}
.case-card {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  padding: 32px;
  display: flex; flex-direction: column;
  transition: border-color .25s, background .25s;
}
.case-card:hover { border-color: var(--line-strong); background: var(--bg-elev); }
.case-card .head {
  display: flex; justify-content: space-between; align-items: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  color: var(--ink-mute);
  margin-bottom: 22px;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--line);
}
.case-card .head .id { color: var(--lab); }
.case-card h3 {
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: 26px;
  letter-spacing: -.025em;
  line-height: 1.15;
  color: var(--ink);
  margin-bottom: 14px;
}
.case-card p {
  color: var(--ink-dim);
  font-size: 14.5px;
  line-height: 1.65;
  margin-bottom: 22px;
  flex: 1;
}
.case-card .results {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-bottom: 18px;
}
.case-card .res .v {
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: 26px;
  letter-spacing: -.025em;
  color: var(--lab);
  line-height: 1;
}
.case-card .res .l {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  color: var(--ink-mute);
  letter-spacing: .06em;
  text-transform: uppercase;
  margin-top: 6px;
}
.case-card .more {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--lab);
}

@media (max-width: 900px) { .cases-grid { grid-template-columns: 1fr; } }

/* ========== PROCESS / METHOD ========== */
.process {
  max-width: var(--maxw); margin: 0 auto;
  padding: 0 28px 96px;
}
.process-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 0;
  border-top: 1px solid var(--line);
  margin-top: 28px;
}
.step {
  padding: 32px 24px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  display: flex; flex-direction: column;
  background: var(--bg-soft);
}
.step:last-child { border-right: 1px solid var(--line); }
.step .ref {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--ink-mute);
  letter-spacing: .04em;
  margin-bottom: 18px;
  display: flex; justify-content: space-between;
}
.step .ref .num { color: var(--lab); }
.step h4 {
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: 18px;
  letter-spacing: -.015em;
  color: var(--ink);
  margin-bottom: 10px;
}
.step p {
  color: var(--ink-dim);
  font-size: 13.5px;
  line-height: 1.65;
  flex: 1;
}
.step .duration {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--lab);
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
}
@media (max-width: 1024px) { .process-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .process-grid { grid-template-columns: 1fr; } }

/* ========== TESTIMONIAL ========== */
.testimonial-feature {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 96px 0;
  background: var(--bg-soft);
}
.tf-inner {
  max-width: 880px; margin: 0 auto;
  padding: 0 28px;
}
.tf-inner .open {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--lab);
  letter-spacing: .12em;
  margin-bottom: 24px;
  text-transform: uppercase;
}
.tf-inner blockquote {
  font-family: 'Inter', sans-serif;
  font-weight: 400;
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1.4;
  letter-spacing: -.02em;
  color: var(--ink);
  margin-bottom: 32px;
}
.tf-inner blockquote em {
  font-family: 'Fraunces', serif; font-style: italic;
  color: var(--lab);
}
.tf-inner .author {
  display: flex; align-items: center; gap: 14px;
  padding-top: 24px; border-top: 1px solid var(--line);
}
.tf-inner .avatar {
  width: 44px; height: 44px;
  background: var(--lab);
  color: var(--bg);
  display: flex; align-items: center; justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  font-size: 16px;
}
.tf-inner .meta { display: flex; flex-direction: column; gap: 2px; }
.tf-inner .name {
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: 14.5px;
  color: var(--ink);
}
.tf-inner .role {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--ink-mute);
}

/* ========== PRICING ========== */
.pricing {
  max-width: var(--maxw); margin: 0 auto;
  padding: 0 28px 96px;
}
.pricing-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin-top: 28px;
  border-top: 1px solid var(--line);
}
.tier {
  padding: 36px 28px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--bg-soft);
  display: flex; flex-direction: column;
}
.tier:last-child { border-right: 1px solid var(--line); }
.tier.featured {
  background: var(--bg-elev);
  position: relative;
}
.tier.featured::before {
  content: '◆ Most engaged';
  position: absolute;
  top: -1px; left: -1px;
  background: var(--lab);
  color: var(--bg);
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px;
  font-weight: 500;
  padding: 5px 12px;
  letter-spacing: .04em;
}
.tier .tier-id {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--ink-mute);
  letter-spacing: .04em;
  margin-bottom: 16px;
}
.tier .tier-id .lab-accent { color: var(--lab); }
.tier .price-row {
  display: flex; align-items: baseline; gap: 8px;
  padding-bottom: 16px;
  border-bottom: 1px dashed var(--line);
  margin-bottom: 20px;
}
.tier .price-row .amount {
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: 44px;
  letter-spacing: -.04em;
  color: var(--ink);
  line-height: 1;
}
.tier .price-row .unit {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--ink-mute);
}
.tier h4 {
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: 19px;
  letter-spacing: -.015em;
  color: var(--ink);
  margin-bottom: 10px;
}
.tier p.tagline {
  color: var(--ink-dim);
  font-size: 14px;
  line-height: 1.6;
  margin-bottom: 24px;
}
.tier ul.features {
  display: flex; flex-direction: column; gap: 10px;
  margin-bottom: 28px;
  flex: 1;
}
.tier ul.features li {
  font-size: 13px;
  color: var(--ink-soft);
  padding-left: 18px;
  position: relative;
  line-height: 1.55;
}
.tier ul.features li::before {
  content: '▸';
  position: absolute; left: 0; top: 0;
  color: var(--lab);
  font-family: 'JetBrains Mono', monospace;
}
.tier .tier-cta { width: 100%; }

@media (max-width: 1024px) {
  .pricing-grid { grid-template-columns: 1fr; }
  .tier { border-right: 1px solid var(--line); }
}

/* ========== BOOK STRIP ========== */
.book-strip {
  background: var(--lab);
  color: var(--bg);
  padding: 96px 28px;
  text-align: center;
  border-top: 1px solid var(--line);
}
.book-strip .inner { max-width: 760px; margin: 0 auto; }
.book-strip .ref {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  margin-bottom: 18px;
  opacity: .7;
}
.book-strip h2 {
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: clamp(38px, 5vw, 56px);
  line-height: 1.05;
  letter-spacing: -.03em;
  margin-bottom: 18px;
}
.book-strip h2 em {
  font-family: 'Fraunces', serif; font-style: italic;
  font-weight: 400;
}
.book-strip p {
  font-size: 16px;
  opacity: .85;
  line-height: 1.6;
  max-width: 540px; margin: 0 auto 32px;
}
.book-strip .btn {
  background: var(--bg);
  color: var(--lab);
}
.book-strip .btn:hover { background: var(--ink); color: var(--bg); }

/* ========== FAQ ========== */
.faq {
  max-width: 880px; margin: 0 auto;
  padding: 96px 28px;
}
.faq-list {
  margin-top: 28px;
  border-top: 1px solid var(--line);
}
.faq-item { border-bottom: 1px solid var(--line); }
.faq-q {
  padding: 24px 0; cursor: pointer;
  display: flex; justify-content: space-between; align-items: baseline;
  gap: 24px;
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: 17px;
  letter-spacing: -.015em;
  color: var(--ink);
  list-style: none;
}
.faq-q::-webkit-details-marker { display: none; }
.faq-q .num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--lab);
  margin-right: 16px;
}
.faq-q::after {
  content: '+';
  font-family: 'JetBrains Mono', monospace;
  font-size: 22px;
  color: var(--ink-dim);
  transition: transform .25s, color .2s;
  font-weight: 400;
}
.faq-item[open] .faq-q::after { transform: rotate(45deg); color: var(--lab); }
.faq-a {
  padding: 0 0 24px;
  font-size: 14.5px;
  color: var(--ink-dim);
  line-height: 1.7;
  max-width: 720px;
  padding-left: 38px;
}
.faq-a a { color: var(--lab); text-decoration: underline; text-decoration-color: var(--line-strong); }

/* ========== FOOTER ========== */
.foot {
  background: var(--bg);
  border-top: 1px solid var(--line);
  padding: 64px 0 24px;
}
.foot-inner { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }
.foot-top {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
}
.foot-brand .big {
  font-family: 'JetBrains Mono', monospace;
  font-size: 18px;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 14px;
  display: inline-flex; align-items: center; gap: 8px;
}
.foot-brand .big .square {
  width: 14px; height: 14px;
  background: var(--lab);
}
.foot-brand p {
  color: var(--ink-dim);
  max-width: 320px;
  font-size: 14px;
  line-height: 1.65;
  margin-bottom: 22px;
}
.foot-soc { display: flex; gap: 8px; }
.foot-soc a {
  width: 34px; height: 34px;
  border: 1px solid var(--line);
  display: flex; align-items: center; justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--ink-dim);
  transition: all .2s;
}
.foot-soc a:hover { background: var(--lab); color: var(--bg); border-color: var(--lab); }
.foot-col h4 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 500;
  color: var(--ink-mute);
  letter-spacing: .08em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.foot-col ul { display: flex; flex-direction: column; gap: 9px; }
.foot-col a {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--ink-soft);
  transition: color .2s;
}
.foot-col a:hover { color: var(--lab); }

.foot-legal {
  margin-top: 28px; padding-top: 22px;
  border-top: 1px dashed var(--line);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--ink-mute);
  line-height: 1.7;
}
.foot-legal p { margin-bottom: 6px; }
.foot-legal strong { color: var(--ink-soft); }
.foot-legal a { color: var(--ink-dim); text-decoration: underline; text-decoration-color: var(--line); }

.foot-bot {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 22px; margin-top: 22px;
  border-top: 1px solid var(--line);
  color: var(--ink-mute);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  flex-wrap: wrap; gap: 12px;
}
.foot-bot .legal-links { display: flex; gap: 16px; }
.foot-bot .legal-links a:hover { color: var(--lab); }

@media (max-width: 900px) {
  .foot-top { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 520px) {
  .foot-top { grid-template-columns: 1fr; }
}

/* ========== PAGE HEAD ========== */
.page-head {
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
  background: var(--bg-soft);
}
.page-head .inner { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }
.page-head .meta-line {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 24px;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--line);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--ink-mute);
}
.page-head .meta-line .breadcrumb a { color: var(--lab); }
.page-head .meta-line .docref { color: var(--lab); }
.page-head h1 {
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: clamp(40px, 5.5vw, 64px);
  line-height: 1.02;
  letter-spacing: -.035em;
  color: var(--ink);
  margin-bottom: 16px;
}
.page-head h1 em { font-family: 'Fraunces', serif; font-style: italic; font-weight: 400; color: var(--lab); }
.page-head p {
  font-size: 16.5px;
  color: var(--ink-dim);
  max-width: 720px;
  line-height: 1.6;
}

/* ========== PROSE (legal) ========== */
.prose {
  max-width: 760px; margin: 0 auto;
  padding: 56px 28px 96px;
}
.prose h2 {
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: 22px;
  letter-spacing: -.02em;
  color: var(--ink);
  margin: 36px 0 12px;
}
.prose h2:first-child { margin-top: 0; }
.prose h3 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13.5px;
  color: var(--ink-soft);
  margin: 22px 0 8px;
  letter-spacing: -.005em;
}
.prose p, .prose li {
  font-size: 14.5px;
  color: var(--ink-dim);
  line-height: 1.75;
  margin-bottom: 12px;
}
.prose ul, .prose ol { padding-left: 24px; margin-bottom: 14px; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose strong { color: var(--ink); font-weight: 500; }
.prose a { color: var(--lab); text-decoration: underline; text-decoration-color: var(--line-strong); }
.prose .updated {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--ink-mute);
  margin-bottom: 28px;
}

/* ========== BOOK / CONTACT FORMS ========== */
.book-wrap, .contact-wrap {
  max-width: 1040px; margin: 0 auto;
  padding: 56px 28px 96px;
  display: grid; grid-template-columns: 1fr 1.4fr;
  gap: 32px;
}
.book-info, .contact-info {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  padding: 32px;
  height: fit-content;
}
.book-info h3, .contact-info h3 {
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: 19px;
  letter-spacing: -.015em;
  color: var(--ink);
  margin-bottom: 18px;
}
.book-info ul {
  display: flex; flex-direction: column; gap: 12px;
  margin-bottom: 24px;
}
.book-info ul li {
  font-size: 13.5px;
  color: var(--ink-soft);
  padding-left: 18px;
  position: relative;
  line-height: 1.55;
}
.book-info ul li::before {
  content: '▸';
  position: absolute; left: 0; top: 0;
  color: var(--lab);
  font-family: 'JetBrains Mono', monospace;
}
.book-info .meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--ink-mute);
  margin-top: 24px; padding-top: 20px;
  border-top: 1px dashed var(--line);
  display: flex; flex-direction: column; gap: 6px;
}
.contact-info .item { margin-bottom: 22px; }
.contact-info .item h4 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--ink-mute);
  letter-spacing: .08em;
  text-transform: uppercase;
  margin-bottom: 6px;
}
.contact-info .item p {
  font-size: 14px; color: var(--ink); line-height: 1.55;
  font-family: 'JetBrains Mono', monospace;
}
.contact-info .item a { color: var(--lab); }

.book-form, .contact-form {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  padding: 32px;
  display: flex; flex-direction: column; gap: 16px;
}
.field-row {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.field { display: flex; flex-direction: column; gap: 6px; }
.field.full { grid-column: 1 / -1; }
.field label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--ink-mute);
  letter-spacing: .04em;
}
.field input, .field select, .field textarea {
  padding: 12px 14px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  color: var(--ink);
  outline: none;
  transition: border-color .15s;
}
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--lab);
}
.field input.invalid, .field select.invalid, .field textarea.invalid { border-color: #FF5C5C; }
.field textarea {
  resize: vertical;
  min-height: 100px;
  font-family: 'Inter', sans-serif;
  font-size: 14.5px;
}
.field .err {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: #FF7B7B;
  display: none;
}
.field input.invalid + .err,
.field select.invalid + .err,
.field textarea.invalid + .err { display: block; }
.submit-row {
  display: flex; flex-direction: column; gap: 10px;
  margin-top: 8px;
}
.fine {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--ink-mute);
  line-height: 1.55;
}
.fine a { color: var(--ink-dim); text-decoration: underline; }

@media (max-width: 768px) {
  .book-wrap, .contact-wrap { grid-template-columns: 1fr; gap: 20px; }
  .field-row { grid-template-columns: 1fr; }
}

/* ========== CONFIRMATION ========== */
.confirm {
  max-width: 600px; margin: 0 auto;
  padding: 96px 28px;
  text-align: center;
}
.confirm .square-icon {
  width: 64px; height: 64px;
  background: var(--lab);
  display: inline-flex; align-items: center; justify-content: center;
  margin-bottom: 28px;
}
.confirm .square-icon svg { width: 28px; height: 28px; stroke: var(--bg); stroke-width: 3; fill: none; }
.confirm h1 {
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: clamp(36px, 5vw, 52px);
  line-height: 1.05;
  letter-spacing: -.03em;
  color: var(--ink);
  margin-bottom: 16px;
}
.confirm h1 em { font-family: 'Fraunces', serif; font-style: italic; font-weight: 400; color: var(--lab); }
.confirm p {
  font-size: 16px;
  color: var(--ink-dim);
  line-height: 1.65;
  margin-bottom: 12px;
}
.confirm .ref {
  display: inline-block;
  margin: 16px 0 28px;
  padding: 10px 18px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--lab);
  letter-spacing: .04em;
}
.confirm .actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

/* ========== TOAST ========== */
.toast {
  position: fixed;
  bottom: 24px; right: 24px;
  background: var(--bg-soft);
  border: 1px solid var(--lab);
  color: var(--ink);
  padding: 12px 18px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  z-index: 300;
  display: flex; align-items: center; gap: 10px;
  transform: translateY(120%);
  transition: transform .3s cubic-bezier(.4,0,.2,1);
  max-width: 320px;
}
.toast.show { transform: translateY(0); }
.toast .square {
  width: 8px; height: 8px;
  background: var(--lab);
  flex-shrink: 0;
}