/* ════════════════════════════════════════════════════════════
   FLIGHTLINES site styles
   Built strictly on the Flightlines Design Style Guide v0.2:
   dark native theme · Geist / Geist Mono / Space Grotesk (wordmark)
   one signal accent · hairlines · square-shouldered 3px radii
   spacing snapped to 2/4/8/12/16/24/40 · no gradients, no glows
   ════════════════════════════════════════════════════════════ */
:root {
  /* Marketing-scoped layout vars only, NOT brand tokens. Every brand value
     (color, type, radii, ease, fonts) comes from @flightlines/tokens; this page
     is dark-only, which is the --fl-* default theme. */
  --mkt-max-w: 1140px;
  --mkt-bp-opacity: 0.55;
}
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}
body {
  font-family: var(--fl-font-sans);
  background: var(--fl-bg-0);
  color: var(--fl-tx-1);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a {
  color: inherit;
  text-decoration: none;
}
img {
  display: block;
}

/* ── type roles ── */
.eyebrow {
  font-family: var(--fl-font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fl-tx-2);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow .sq {
  width: 6px;
  height: 6px;
  background: var(--fl-signal);
  flex: none;
}
.display {
  font-family: var(--fl-font-sans);
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.06;
  color: var(--fl-tx-0);
}
.lede {
  font-size: 17px;
  line-height: 1.6;
  color: var(--fl-tx-1);
}
.mono {
  font-family: var(--fl-font-mono);
}
.muted {
  color: var(--fl-tx-2);
}

/* ── buttons ── */
.btn {
  font-family: var(--fl-font-sans);
  font-size: 14px;
  font-weight: 500;
  height: 38px;
  padding: 0 18px;
  border-radius: var(--fl-r-sm);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.16s var(--fl-ease);
}
.btn-primary {
  background: var(--fl-signal);
  color: var(--fl-signal-ink);
  border-color: var(--fl-signal);
  font-weight: 600;
}
.btn-primary:hover {
  background: color-mix(in oklch, var(--fl-signal) 78%, #fff);
  border-color: color-mix(in oklch, var(--fl-signal) 78%, #fff);
}
.btn-ghost {
  background: transparent;
  color: var(--fl-tx-1);
  border-color: var(--fl-line-2);
}
.btn-ghost:hover {
  border-color: var(--fl-line-3);
  color: var(--fl-tx-0);
}
.btn-quiet {
  background: none;
  border: none;
  color: var(--fl-tx-2);
  height: auto;
  padding: 0;
  font-size: 14px;
}
.btn-quiet:hover {
  color: var(--fl-tx-0);
}
.btn .ar {
  font-size: 13px;
}

/* ── tags ── */
.tag {
  font-family: var(--fl-font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 3px 7px;
  border-radius: var(--fl-r-sm);
  border: 1px solid;
  line-height: 1.4;
  display: inline-block;
}
.tag-mint {
  color: var(--fl-mint);
  background: var(--fl-mint-bg);
  border-color: var(--fl-mint-line);
}
.tag-amber {
  color: var(--fl-amber);
  background: var(--fl-amber-bg);
  border-color: var(--fl-amber-line);
}
.tag-info {
  color: var(--fl-signal);
  background: var(--fl-signal-bg);
  border-color: var(--fl-signal-line);
}

/* ── nav ── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  background: rgba(0, 0, 0, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.24s var(--fl-ease);
}
.nav.scrolled {
  border-bottom-color: var(--fl-line);
}
.nav-links {
  display: flex;
  gap: 30px;
  list-style: none;
}
.nav-links a {
  font-size: 14px;
  color: var(--fl-tx-2);
  transition: color 0.16s var(--fl-ease);
}
.nav-links a:hover,
.nav-links a.on {
  color: var(--fl-tx-0);
}
.nav-right {
  display: flex;
  align-items: center;
  gap: 18px;
}
.nav-dash {
  font-size: 14px;
  color: var(--fl-tx-1);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.nav-dash .ar {
  color: var(--fl-tx-2);
  font-size: 12px;
}
.nav-dash:hover {
  color: var(--fl-tx-0);
}
.burger {
  display: none;
  background: none;
  border: 1px solid var(--fl-line-2);
  border-radius: var(--fl-r-sm);
  width: 36px;
  height: 36px;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}
.burger span {
  display: block;
  width: 16px;
  height: 1.5px;
  background: var(--fl-tx-0);
}
.mobmenu {
  position: fixed;
  inset: 0;
  z-index: 99;
  background: rgba(0, 0, 0, 0.96);
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
}
.mobmenu.open {
  display: flex;
}
.mobmenu a {
  font-size: 20px;
  color: var(--fl-tx-1);
}
.mobmenu a:hover {
  color: var(--fl-tx-0);
}

/* ── hero ── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 160px 40px 0;
  overflow: hidden;
}

/* ════════════════════════════════════════════════════════════
   BACKGROUND SCHEMATIC SYSTEM · "the light table"
   Composed drafting wall: plates are pinned sheets at varied scale,
   rotation and depth. Motion = ink-in on arrival (a cyan plotter pen
   sweeps each sheet in), scroll-parallax by depth, and a discrete
   light-table shuffle that re-inks one hero sheet on long holds.
   Hooks: --mkt-bp-opacity scales the whole wall · --draw = ink-in speed.
   ════════════════════════════════════════════════════════════ */
.bp-zone {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}
.bp-zone--hero {
  -webkit-mask-image: radial-gradient(116% 78% at 50% 40%, transparent 0, transparent 6%, #000 34%);
  mask-image: radial-gradient(116% 78% at 50% 40%, transparent 0, transparent 6%, #000 34%);
}
.bp-sheet {
  position: absolute;
  will-change: transform;
  opacity: calc(var(--mkt-bp-opacity) * var(--dim, 1));
  transform: translate(-50%, -50%) translateY(var(--py, 0px));
}
.bp-rot {
  position: relative;
  width: 100%;
  overflow: hidden;
  transform: rotate(var(--rot, 0deg)) scale(var(--scl, 1));
  transform-origin: 50% 50%;
  transition: transform 0.9s var(--fl-ease);
}
.bp-curtain {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(90deg, transparent 0, var(--fl-bg-0) 26px, var(--fl-bg-0) 100%);
  transform: translateX(101%);
} /* default = REVEALED: plates are visible with zero JS */
.bp-curtain::before {
  content: '';
  position: absolute;
  left: 14px;
  top: 0;
  bottom: 0;
  width: 1.5px;
  background: var(--fl-signal);
  opacity: 0.5;
}
/* the ink-in is a pure-CSS enhancement, added only when the document is visible;
   its resting state is revealed, so a throttled/hidden frame can never hide a plate */
@keyframes bpInk {
  from {
    transform: translateX(-14%);
  }
  to {
    transform: translateX(101%);
  }
}
.bp-sheet.ink .bp-curtain {
  animation: bpInk var(--draw, 1.3s) cubic-bezier(0.5, 0, 0.12, 1) forwards;
}
@media (prefers-reduced-motion: reduce) {
  .bp-curtain {
    display: none;
  }
  .bp-rot {
    transition: none;
  }
}

/* engineering plates (white line art) */
.fl-plate {
  width: 100%;
  height: auto;
  display: block;
}
.fl-plate .o {
  stroke: #fff;
  stroke-opacity: 0.92;
  fill: none;
  stroke-width: 0.7;
  stroke-linejoin: round;
  stroke-linecap: round;
}
.fl-plate .d {
  stroke: #fff;
  stroke-opacity: 0.42;
  fill: none;
  stroke-width: 0.5;
}
.fl-plate .c {
  stroke: #fff;
  stroke-opacity: 0.46;
  fill: none;
  stroke-width: 0.5;
  stroke-dasharray: 16 5 2 5;
}
.fl-plate .t {
  fill: #fff;
  fill-opacity: 0.6;
  font-family: var(--fl-font-mono);
  font-size: 10px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
}
.fl-plate .tm {
  text-anchor: middle;
}
.fl-plate .fill {
  fill: rgba(255, 255, 255, 0.14);
  stroke: #fff;
  stroke-opacity: 0.5;
  stroke-width: 0.5;
}
.fl-plate .sig {
  stroke: var(--fl-signal);
  stroke-opacity: 0.8;
  fill: color-mix(in oklch, var(--fl-signal) 6%, transparent);
  stroke-width: 0.7;
}
.fl-plate .sigd {
  stroke: var(--fl-signal);
  stroke-opacity: 0.55;
  fill: none;
  stroke-width: 0.6;
  stroke-dasharray: 4 4;
}
.fl-plate .tsig {
  fill: var(--fl-signal);
  fill-opacity: 0.75;
  font-family: var(--fl-font-mono);
  font-size: 9px;
  letter-spacing: 1.2px;
}
.hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.hero-inner .eyebrow {
  margin-bottom: 30px;
}
.hero h1 {
  font-size: clamp(48px, 7.4vw, 86px);
  letter-spacing: -0.03em;
}
.hero .lede {
  margin-top: 28px;
  max-width: 560px;
  font-size: 18px;
}
.hero-cta {
  display: flex;
  gap: 12px;
  margin-top: 38px;
  flex-wrap: wrap;
  justify-content: center;
}
.hero-foot {
  margin-top: 40px;
  font-family: var(--fl-font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--fl-tx-3);
  text-transform: uppercase;
}

/* instrument strip */
.strip {
  position: relative;
  z-index: 1;
  margin-top: auto;
  width: 100%;
  max-width: 1240px;
  padding: 96px 0 54px;
}
.strip-line {
  position: relative;
  height: 1px;
  background: var(--fl-line-2);
  overflow: visible;
}
.strip-scan {
  position: absolute;
  top: 0;
  left: -160px;
  height: 1px;
  width: 160px;
  background: var(--fl-signal);
  opacity: 0.8;
}
@media (prefers-reduced-motion: no-preference) {
  .strip-scan {
    animation: scan 7s linear infinite;
  }
}
body.no-scan .strip-scan {
  display: none;
}
@keyframes scan {
  from {
    left: -160px;
  }
  to {
    left: 100%;
  }
}
.strip-nodes {
  display: flex;
  justify-content: space-between;
  margin-top: -4px;
}
.strip-nodes a {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  flex: 1;
}
.strip-nodes .dot {
  width: 7px;
  height: 7px;
  background: var(--fl-bg-0);
  border: 1px solid var(--fl-line-3);
  transition: all 0.16s var(--fl-ease);
}
.strip-nodes .nl {
  font-family: var(--fl-font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--fl-tx-2);
  text-transform: uppercase;
  transition: color 0.16s var(--fl-ease);
}
.strip-nodes a:hover .dot {
  background: var(--fl-signal);
  border-color: var(--fl-signal);
}
.strip-nodes a:hover .nl {
  color: var(--fl-tx-0);
}

/* ── section shells ── */
.sec {
  position: relative;
  padding: 120px 40px;
}
.wrap {
  max-width: var(--mkt-max-w);
  margin: 0 auto;
}
.sec-head {
  max-width: 680px;
  margin-bottom: 64px;
}
.sec-head.cn {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}
.sec-head.cn .eyebrow {
  justify-content: center;
}
.sec-head .eyebrow {
  margin-bottom: 20px;
}
.sec-head h2 {
  font-size: clamp(30px, 3.6vw, 44px);
}
.sec-head .lede {
  margin-top: 16px;
  color: var(--fl-tx-2);
}
.hairtop {
  border-top: 1px solid var(--fl-line);
}
.raised {
  background: var(--fl-bg-1);
}

/* ── problem ── */
.prob-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.prob {
  border-top: 1px solid var(--fl-line-2);
  padding-top: 16px;
}
.prob .eyebrow {
  margin-bottom: 12px;
  color: var(--fl-tx-3);
}
.prob h3 {
  font-size: 16px;
  font-weight: 500;
  color: var(--fl-tx-0);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}
.prob p {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--fl-tx-2);
}

/* ── product ── */
.prod-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.prod-row + .prod-row {
  margin-top: 96px;
}
.prod-copy h3 {
  font-family: var(--fl-font-sans);
  font-weight: 600;
  font-size: 26px;
  letter-spacing: -0.015em;
  color: var(--fl-tx-0);
  line-height: 1.15;
  margin-bottom: 14px;
}
.prod-copy .eyebrow {
  margin-bottom: 18px;
}
.prod-copy p {
  font-size: 15px;
  line-height: 1.65;
  color: var(--fl-tx-2);
}
.prod-copy p + p {
  margin-top: 12px;
}
.prod-copy strong {
  color: var(--fl-tx-1);
  font-weight: 500;
}
.feat-list {
  list-style: none;
  margin-top: 20px;
}
.feat-list li {
  padding: 10px 0;
  border-top: 1px solid var(--fl-line);
  font-size: 14px;
  color: var(--fl-tx-1);
  display: flex;
  gap: 12px;
  align-items: baseline;
}
.feat-list li::before {
  content: '→';
  font-family: var(--fl-font-mono);
  color: var(--fl-signal);
  font-size: 12px;
  flex: none;
}

/* fuse diagram */
.fuse {
  display: flex;
  flex-direction: column;
  max-width: 460px;
  width: 100%;
  margin: 0 auto;
}
.fcard {
  background: var(--fl-bg-1);
  border: 1px solid var(--fl-line);
  border-radius: var(--fl-r-sm);
  padding: 20px 22px;
  position: relative;
  z-index: 2;
}
.fcard .fh {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  gap: 12px;
}
.fcard .ft {
  font-family: var(--fl-font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fl-tx-0);
}
.fcard .fs {
  font-family: var(--fl-font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--fl-tx-3);
  text-transform: uppercase;
  white-space: nowrap;
}
.fcard .frow {
  font-size: 13px;
  color: var(--fl-tx-2);
  padding: 6px 0;
  border-top: 1px solid var(--fl-line);
}
.fcard .frow:first-of-type {
  border-top: none;
}
.fuse-link {
  position: relative;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.fuse-link .spine {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: var(--fl-signal-line);
}
.fuse-node {
  position: relative;
  z-index: 3;
  background: var(--fl-bg-0);
  padding: 6px 14px;
}
.fuse-node .nn {
  font-family: var(--fl-font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fl-signal);
  border: 1px solid var(--fl-signal-line);
  background: var(--fl-signal-bg);
  padding: 5px 12px;
  border-radius: var(--fl-r-full);
  display: inline-block;
}
.fuse-ar {
  position: absolute;
  font-family: var(--fl-font-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  color: var(--fl-tx-3);
  text-transform: uppercase;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 5px;
  background: var(--fl-bg-0);
  padding: 0 6px;
}
.fuse-ar.up {
  top: 2px;
}
.fuse-ar.dn {
  bottom: 2px;
}
.fuse-ar .arr {
  color: var(--fl-signal);
}

/* health panel */
.panel {
  background: var(--fl-bg-1);
  border: 1px solid var(--fl-line);
  border-radius: var(--fl-r-sm);
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
  overflow: hidden;
}
.panel-h {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--fl-line);
}
.panel-live {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--fl-font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--fl-mint);
  text-transform: uppercase;
}
.panel-live .d {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--fl-mint);
}
@media (prefers-reduced-motion: no-preference) {
  .panel-live .d {
    animation: pulse 2.4s infinite;
  }
}
@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 color-mix(in oklch, var(--fl-mint) 40%, transparent);
  }
  70% {
    box-shadow: 0 0 0 7px transparent;
  }
  100% {
    box-shadow: 0 0 0 0 transparent;
  }
}
.trace {
  padding: 16px 20px 6px;
}
.trace svg {
  display: block;
  width: 100%;
  height: auto;
}
.rows {
  padding: 4px 20px 14px;
}
.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
  border-top: 1px solid var(--fl-line);
}
.row:first-child {
  border-top: none;
}
.row .lab {
  font-size: 13px;
  color: var(--fl-tx-1);
}
.row .lab .sub {
  font-family: var(--fl-font-mono);
  font-size: 9.5px;
  color: var(--fl-tx-3);
  letter-spacing: 0.06em;
  margin-top: 2px;
}
.predict {
  margin: 0 20px 20px;
  border: 1px solid var(--fl-amber-line);
  background: var(--fl-amber-bg);
  border-radius: var(--fl-r-sm);
  padding: 12px 14px;
}
.predict .ph {
  font-family: var(--fl-font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--fl-amber);
  text-transform: uppercase;
  margin-bottom: 5px;
}
.predict .pb {
  font-size: 13px;
  color: var(--fl-tx-0);
  line-height: 1.5;
}
.predict .pn {
  font-family: var(--fl-font-mono);
  font-size: 9.5px;
  color: var(--fl-tx-2);
  margin-top: 6px;
  letter-spacing: 0.04em;
}

/* the box */
.devbox {
  width: 240px;
  height: 150px;
  background: var(--fl-bg-2);
  border: 1px solid var(--fl-line-2);
  border-radius: var(--fl-r-sm);
  position: relative;
  margin: 0 auto;
}
.devbox .etch {
  position: absolute;
  top: 16px;
  left: 18px;
  font-family: var(--fl-font-mono);
  font-size: 9px;
  letter-spacing: 0.22em;
  color: var(--fl-tx-3);
  text-transform: uppercase;
}
.devbox .led {
  position: absolute;
  top: 16px;
  right: 18px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--fl-mint);
}
@media (prefers-reduced-motion: no-preference) {
  .devbox .led {
    animation: pulse 2.4s infinite;
  }
}
.devbox .ports {
  position: absolute;
  bottom: 16px;
  left: 18px;
  right: 18px;
  display: flex;
  gap: 8px;
}
.devbox .ports span {
  height: 9px;
  border-radius: 2px;
  background: var(--fl-bg-0);
  border: 1px solid var(--fl-line);
}
.devbox .ports .p1 {
  width: 34px;
}
.devbox .ports .p2 {
  width: 22px;
}
.devbox .ports .p3 {
  width: 46px;
  margin-left: auto;
}
.devwrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}
.devwrap .cap {
  font-family: var(--fl-font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--fl-tx-2);
  text-transform: uppercase;
}
.devwrap .cap .hl {
  color: var(--fl-signal);
}

/* ── how it works ── */
#how .wrap {
  position: relative;
  z-index: 1;
}
.steps {
  position: relative;
  margin-top: 24px;
}
.steps-line {
  position: absolute;
  top: 3px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--fl-line-2);
}
.steps-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 24px;
}
.step {
  padding-top: 0;
}
.step .dot {
  width: 7px;
  height: 7px;
  background: var(--fl-bg-0);
  border: 1px solid var(--fl-line-3);
  margin-bottom: 18px;
  transition: all 0.3s var(--fl-ease);
}
.step.vis .dot {
  background: var(--fl-signal);
  border-color: var(--fl-signal);
}
.step .idx {
  font-family: var(--fl-font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--fl-tx-3);
  margin-bottom: 8px;
}
.step h3 {
  font-size: 16px;
  font-weight: 500;
  color: var(--fl-tx-0);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}
.step p {
  font-size: 13px;
  line-height: 1.6;
  color: var(--fl-tx-2);
}
.install {
  margin-top: 80px;
  border: 1px solid var(--fl-line);
  background: var(--fl-bg-1);
  border-radius: var(--fl-r-sm);
  padding: 24px 24px;
  display: flex;
  align-items: center;
  gap: 40px;
  justify-content: space-between;
  flex-wrap: wrap;
}
.install .l .eyebrow {
  margin-bottom: 10px;
}
.install .l h3 {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--fl-tx-0);
}
.install .r {
  font-size: 14px;
  color: var(--fl-tx-2);
  max-width: 520px;
  line-height: 1.65;
}
.install .r strong {
  color: var(--fl-tx-1);
  font-weight: 500;
}

/* ── platform: seat selector ── */
.seat-tabs {
  display: flex;
  gap: 8px;
  border-bottom: 1px solid var(--fl-line);
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.seat-tab {
  font-family: var(--fl-font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fl-tx-2);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 12px 16px;
  margin-bottom: -1px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: color 0.16s var(--fl-ease);
}
.seat-tab .dot {
  width: 6px;
  height: 6px;
  background: transparent;
  border: 1px solid var(--fl-line-3);
  transition: all 0.16s var(--fl-ease);
}
.seat-tab:hover {
  color: var(--fl-tx-0);
}
.seat-tab.on {
  color: var(--fl-tx-0);
  border-bottom-color: var(--fl-signal);
}
.seat-tab.on .dot {
  background: var(--fl-signal);
  border-color: var(--fl-signal);
}
.seat-pane {
  display: none;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}
.seat-pane.on {
  display: grid;
  animation: paneIn 0.4s var(--fl-ease);
}
/* transform-only: a stalled animation clock can never leave content invisible */
@keyframes paneIn {
  from {
    transform: translateY(10px);
  }
  to {
    transform: none;
  }
}
@media (prefers-reduced-motion: reduce) {
  .seat-pane.on {
    animation: none;
  }
}
.seat-pane .sh {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}
.seat-pane h3 {
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 600;
  letter-spacing: -0.018em;
  color: var(--fl-tx-0);
  line-height: 1.18;
  margin-bottom: 16px;
}
.seat-pane .narr {
  font-size: 15px;
  line-height: 1.7;
  color: var(--fl-tx-2);
}
.seat-pane .narr strong {
  color: var(--fl-tx-1);
  font-weight: 500;
}
.seat-mono {
  margin-top: 28px;
  font-family: var(--fl-font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--fl-tx-3);
  text-transform: uppercase;
}
.seat-mono .hl {
  color: var(--fl-signal);
}
.seat-pane .feat-list {
  margin-top: 0;
}
.seat-pane .feat-list li {
  padding: 12px 0;
  font-size: 14px;
  line-height: 1.55;
}

/* ── why ── */
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px 48px;
}
.why {
  border-top: 1px solid var(--fl-line-2);
  padding-top: 18px;
}
.why .eyebrow {
  margin-bottom: 12px;
}
.why h3 {
  font-size: 18px;
  font-weight: 500;
  color: var(--fl-tx-0);
  letter-spacing: -0.01em;
  margin-bottom: 10px;
}
.why p {
  font-size: 14px;
  line-height: 1.65;
  color: var(--fl-tx-2);
}
.why p strong {
  color: var(--fl-tx-1);
  font-weight: 500;
}
.why-close {
  margin-top: 80px;
  padding-top: 32px;
  border-top: 1px solid var(--fl-line);
  text-align: center;
}
.why-close p {
  font-family: var(--fl-font-sans);
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 500;
  letter-spacing: -0.015em;
  color: var(--fl-tx-0);
  line-height: 1.4;
  max-width: 760px;
  margin: 0 auto;
}
.why-close .hl {
  color: var(--fl-signal);
}

/* ── cta ── */
.cta {
  position: relative;
  padding: 160px 40px;
  overflow: hidden;
  border-top: 1px solid var(--fl-line);
}
.cta-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}
.cta-inner .eyebrow {
  justify-content: center;
  margin-bottom: 24px;
}
.cta-inner h2 {
  font-size: clamp(34px, 4.6vw, 56px);
  letter-spacing: -0.025em;
}
.cta-inner .lede {
  margin-top: 20px;
  color: var(--fl-tx-2);
}
.cta-btns {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 36px;
  flex-wrap: wrap;
}
.cta-dash {
  margin-top: 28px;
  font-size: 14px;
  color: var(--fl-tx-2);
}
.cta-dash a {
  color: var(--fl-tx-1);
  border-bottom: 1px solid var(--fl-line-2);
}
.cta-dash a:hover {
  color: var(--fl-signal);
  border-color: var(--fl-signal-line);
}

/* ── footer ── */
.footer {
  border-top: 1px solid var(--fl-line);
  padding: 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.footer .fl-wordmark {
  font-size: var(--fl-text-body);
}
.foot-links {
  display: flex;
  gap: 24px;
  list-style: none;
  flex-wrap: wrap;
}
.foot-links a {
  font-size: 13px;
  color: var(--fl-tx-2);
}
.foot-links a:hover {
  color: var(--fl-tx-0);
}
.foot-copy {
  font-family: var(--fl-font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--fl-tx-3);
  text-transform: uppercase;
}

/* ── reveal ── */
.rv {
  opacity: 0;
  transform: translateY(14px);
  transition:
    opacity 0.7s var(--fl-ease),
    transform 0.7s var(--fl-ease);
}
.rv.vis {
  opacity: 1;
  transform: translateY(0);
}
.rv-d1 {
  transition-delay: 0.08s;
}
.rv-d2 {
  transition-delay: 0.16s;
}
.rv-d3 {
  transition-delay: 0.24s;
}
@media (prefers-reduced-motion: reduce) {
  .rv {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ── responsive ── */
@media (max-width: 1024px) {
  .prob-grid {
    grid-template-columns: 1fr 1fr;
  }
  .prod-row {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .seat-pane {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .why-grid {
    grid-template-columns: 1fr;
  }
  .steps-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 40px 24px;
  }
  .steps-line {
    display: none;
  }
  .step .dot {
    display: none;
  }
  .step {
    border-top: 1px solid var(--fl-line-2);
    padding-top: 14px;
  }
}
@media (max-width: 760px) {
  .nav {
    padding: 0 20px;
  }
  .nav-links {
    display: none;
  }
  .nav-right .btn {
    display: none;
  }
  .burger {
    display: flex;
  }
  .sec {
    padding: 88px 20px;
  }
  .hero {
    padding: 140px 20px 0;
  }
  .prob-grid {
    grid-template-columns: 1fr;
  }
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .strip-nodes .nl {
    font-size: 8.5px;
    letter-spacing: 0.08em;
  }
  .footer {
    padding: 32px 20px;
  }
}

/* ── mail dialog (Request access / Contact): copy-or-open email ── */
.mail-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.mail-modal.open {
  display: flex;
}
.mail-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.mail-card {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 420px;
  background: var(--fl-bg-1);
  border: 1px solid var(--fl-line-2);
  border-radius: var(--fl-r-sm);
  padding: 30px;
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.6);
  animation: mailIn 0.22s var(--fl-ease);
}
@keyframes mailIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}
.mail-x {
  position: absolute;
  top: 14px;
  right: 14px;
  background: none;
  border: none;
  color: var(--fl-tx-3);
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  width: 30px;
  height: 30px;
  border-radius: var(--fl-r-sm);
  transition: color 0.16s var(--fl-ease);
}
.mail-x:hover {
  color: var(--fl-tx-0);
}
.mail-card .eyebrow {
  margin-bottom: 14px;
}
.mail-title {
  font-family: var(--fl-font-sans);
  font-weight: 600;
  font-size: 22px;
  color: var(--fl-tx-0);
  letter-spacing: -0.015em;
  margin: 0 0 8px;
}
.mail-desc {
  font-size: 14px;
  line-height: 1.6;
  color: var(--fl-tx-2);
  margin: 0 0 20px;
}
.mail-addr {
  display: flex;
  align-items: center;
  gap: 12px;
  justify-content: space-between;
  background: var(--fl-bg-3);
  border: 1px solid var(--fl-line);
  border-radius: var(--fl-r-sm);
  padding: 13px 14px;
  margin-bottom: 16px;
}
.mail-email {
  font-family: var(--fl-font-mono);
  font-size: 14px;
  color: var(--fl-tx-0);
  word-break: break-all;
}
.mail-copy {
  flex: none;
  font-family: var(--fl-font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fl-signal);
  background: var(--fl-signal-bg);
  border: 1px solid var(--fl-signal-line);
  border-radius: var(--fl-r-sm);
  padding: 7px 13px;
  cursor: pointer;
  transition: all 0.16s var(--fl-ease);
}
.mail-copy:hover {
  background: color-mix(in oklch, var(--fl-signal) 18%, transparent);
}
.mail-copy.copied {
  color: var(--fl-mint);
  background: var(--fl-mint-bg);
  border-color: var(--fl-mint-line);
}
.mail-open {
  width: 100%;
  justify-content: center;
}