/* ==========================================================================
   Helix Lab — style.css
   Tokens / components follow DESIGN.md as the single source of truth.
   ========================================================================== */

:root {
  /* Base — 深宇宙 */
  --c-bg:            #05070D;
  --c-bg-elev:       #0B1020;
  --c-bg-elev-2:     #121A30;
  --c-nebula:        #0A2A5C;

  /* Strands — 二本鎖のアクセント */
  --c-strand-a:      #2EE6D6;
  --c-strand-b:      #8A5CFF;
  --c-strand-a-dim:  rgba(46, 230, 214, 0.18);
  --c-strand-b-dim:  rgba(138, 92, 255, 0.18);
  --g-helix: linear-gradient(90deg, var(--c-strand-a) 0%, var(--c-strand-b) 100%);

  /* Text */
  --c-text:          #EEF2FA;
  --c-text-sub:      #9AA4BF;
  --c-text-mute:     #5B6480;

  /* Lines */
  --c-line:          rgba(238, 242, 250, 0.16);
  --c-line-strong:   rgba(238, 242, 250, 0.40);

  /* Status */
  --c-success:       #3DDC97;
  --c-warning:       #FFB547;
  --c-error:         #FF5C7A;

  /* Type */
  --ff-display: "Space Grotesk", "Noto Sans JP", sans-serif;
  --ff-body:    "Inter", "Noto Sans JP", sans-serif;
  --ff-mono:    "JetBrains Mono", "Noto Sans JP", monospace;

  --fs-hero:  clamp(30px, 7.2vw, 88px);
  --fs-h1:    clamp(32px, 4.2vw, 64px);
  --fs-h2:    clamp(24px, 2.8vw, 40px);
  --fs-h3:    clamp(18px, 1.6vw, 24px);
  --fs-body:  16px;
  --fs-small: 14px;
  --fs-label: 13px;

  /* Space (8px base) */
  --sp-1: 4px;  --sp-2: 8px;   --sp-3: 16px;  --sp-4: 24px;
  --sp-5: 32px; --sp-6: 48px;  --sp-7: 64px;  --sp-8: 96px;
  --sp-9: 128px; --sp-10: 192px;
  --section-gap: clamp(96px, 14vw, 192px);
  --gutter: clamp(16px, 5vw, 120px);
  --maxw: 1280px;

  /* Motion */
  --ease-out:   cubic-bezier(0.22, 1, 0.36, 1);
  --ease-inout: cubic-bezier(0.65, 0, 0.35, 1);
  --dur-fast: 200ms;  --dur-base: 480ms;  --dur-slow: 900ms;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--ff-body);
  font-size: var(--fs-body);
  line-height: 1.9;
  letter-spacing: 0.02em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

body.is-loading { overflow: hidden; }
body.menu-open  { overflow: hidden; }

img, svg, canvas { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ul { margin: 0; padding: 0; list-style: none; }

::selection { background: var(--c-strand-a); color: var(--c-bg); }

:focus-visible {
  outline: 2px solid var(--c-strand-a);
  outline-offset: 2px;
}

/* --- Grain + nebula (page-wide atmosphere) ------------------------------- */

.atmos {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}
.atmos__nebula {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.55;
}
.atmos__nebula--1 {
  width: 54vw; height: 54vw; left: -14vw; top: 4vh;
  background: radial-gradient(circle, var(--c-nebula) 0%, transparent 70%);
}
.atmos__nebula--2 {
  width: 42vw; height: 42vw; right: -10vw; top: 46vh;
  background: radial-gradient(circle, rgba(138, 92, 255, 0.28) 0%, transparent 70%);
}
.atmos__nebula--3 {
  width: 36vw; height: 36vw; left: 22vw; bottom: -12vh;
  background: radial-gradient(circle, rgba(46, 230, 214, 0.14) 0%, transparent 70%);
}
.atmos__grain {
  position: absolute;
  inset: -50%;
  opacity: 0.06;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* --- Skip link ----------------------------------------------------------- */

.skip {
  position: fixed;
  top: -200px; left: var(--sp-3);
  z-index: 200;
  padding: 12px 20px;
  background: var(--c-strand-a);
  color: var(--c-bg);
  font-family: var(--ff-mono);
  font-size: var(--fs-label);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  transition: top var(--dur-fast) var(--ease-out);
}
.skip:focus { top: var(--sp-3); }

/* --- Loader -------------------------------------------------------------- */

.loader {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: grid;
  place-items: center;
  background: var(--c-bg);
  transition: opacity var(--dur-slow) var(--ease-out), visibility var(--dur-slow);
}
.loader.is-done { opacity: 0; visibility: hidden; }
.loader__inner { display: grid; justify-items: center; gap: var(--sp-5); }
.loader__ring { width: 96px; height: 96px; }
.loader__ring circle { fill: none; stroke-width: 1.2; stroke-dasharray: 3 7; }
.loader__ring .s-a { stroke: var(--c-strand-a); animation: spin-cw 2s linear infinite; transform-origin: 50% 50%; }
.loader__ring .s-b { stroke: var(--c-strand-b); animation: spin-ccw 2s linear infinite; transform-origin: 50% 50%; }
.loader__label {
  margin: 0;
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--c-text-mute);
}
@keyframes spin-cw  { to { transform: rotate(360deg); } }
@keyframes spin-ccw { to { transform: rotate(-360deg); } }

/* --- HUD frame ----------------------------------------------------------- */

.hud { position: fixed; inset: 0; z-index: 60; pointer-events: none; }

.hud__corner {
  position: absolute;
  width: 12px; height: 12px;
  border: 0 solid var(--c-line-strong);
}
.hud__corner::after {
  content: "";
  position: absolute;
  width: 2px; height: 2px;
  background: var(--c-strand-a);
}
.hud__corner--tl { top: 20px; left: 20px;  border-top-width: 1px; border-left-width: 1px; }
.hud__corner--tr { top: 20px; right: 20px; border-top-width: 1px; border-right-width: 1px; }
.hud__corner--bl { bottom: 20px; left: 20px;  border-bottom-width: 1px; border-left-width: 1px; }
.hud__corner--br { bottom: 20px; right: 20px; border-bottom-width: 1px; border-right-width: 1px; }
.hud__corner--tl::after { top: 4px; left: 4px; }
.hud__corner--tr::after { top: 4px; right: 4px; }
.hud__corner--bl::after { bottom: 4px; left: 4px; }
.hud__corner--br::after { bottom: 4px; right: 4px; }

.hud__coord {
  position: absolute;
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-text-mute);
}
.hud__coord--tl { top: 18px; left: 40px; }
.hud__coord--br { bottom: 18px; right: 40px; }

.hud__vertical {
  position: absolute;
  left: 22px; top: 50%;
  transform: translateY(-50%);
  writing-mode: vertical-rl;
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--c-text-mute);
}

/* Spiral rung scroll indicator */
.rungs {
  position: absolute;
  right: 24px; top: 50%;
  transform: translateY(-50%);
  display: grid;
  gap: 7px;
}
.rungs__r {
  width: 18px; height: 1px;
  background: var(--c-line);
  transition: background var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out),
              width var(--dur-fast) var(--ease-out);
}
.rungs__r.is-on {
  width: 26px;
  background: var(--c-strand-a);
  box-shadow: 0 0 12px var(--c-strand-a-dim);
}
.rungs__r.is-near { background: var(--c-line-strong); }

/* --- Header capsule ------------------------------------------------------ */

.header {
  position: fixed;
  top: 20px; left: 0; right: 0;
  z-index: 100;
  display: flex;
  justify-content: center;
  pointer-events: none;
  transform-origin: top center;
  transition: transform var(--dur-base) var(--ease-out);
}
.header.is-shrunk { transform: scale(0.92); }

.capsule {
  position: relative;
  pointer-events: auto;
  display: flex;
  align-items: center;
  height: 48px;
  padding: 0 var(--sp-4);
  gap: var(--sp-4);
  border-radius: 999px;
  background: rgba(11, 16, 32, 0.6);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}
/* 1px gradient border */
.capsule::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 999px;
  padding: 1px;
  background: var(--g-helix);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
          mask-composite: exclude;
  pointer-events: none;
  opacity: 0.6;
}

.capsule__div {
  width: 1px; height: 18px;
  background: var(--c-line-strong);
}

.mono-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-family: var(--ff-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-text);
  white-space: nowrap;
}
.mono-btn .brk { color: var(--c-text-mute); transition: color var(--dur-fast) var(--ease-out); }
.mono-btn:hover .brk { color: var(--c-strand-a); }

.burger { display: inline-flex; gap: 3px; }
.burger i {
  width: 5px; height: 5px;
  border-radius: 50%;
  display: block;
  transition: transform var(--dur-base) var(--ease-out);
}
.burger i:first-child { background: var(--c-strand-a); }
.burger i:last-child  { background: var(--c-strand-b); }
.menu-open .burger i:first-child { transform: translateY(-2px); }
.menu-open .burger i:last-child  { transform: translateY(2px); }

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: var(--sp-3);
}
.logo {
  font-family: var(--ff-mono);
  white-space: nowrap;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.14em;
}
.logo__x {
  background: linear-gradient(118deg, var(--c-strand-a) 0 50%, var(--c-strand-b) 50% 100%);
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
}
.rotword {
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-text-sub);
  white-space: nowrap;
}
.rotword b {
  font-weight: 400;
  color: var(--c-strand-a);
}
.rotword .brk { color: var(--c-text-mute); }

/* --- Menu overlay -------------------------------------------------------- */

.menu {
  position: fixed;
  inset: 0;
  z-index: 90;
  visibility: hidden;
  pointer-events: none;
}
.menu.is-open { visibility: visible; pointer-events: auto; }

.menu__panel {
  position: absolute;
  left: 0; right: 0;
  height: 50%;
  background: rgba(5, 7, 13, 0.97);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: transform var(--dur-base) var(--ease-inout);
}
.menu__panel--t { top: 0;    transform: translateY(-101%); }
.menu__panel--b { bottom: 0; transform: translateY(101%); }
.menu.is-open .menu__panel { transform: translateY(0); }

.menu__inner {
  position: absolute;
  inset: 0;
  display: grid;
  align-content: center;
  padding: 0 var(--gutter);
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease-out) 160ms;
}
.menu.is-open .menu__inner { opacity: 1; }

.menu__list { display: grid; gap: clamp(2px, 1vw, 10px); max-width: var(--maxw); margin: 0 auto; width: 100%; }
.menu__item a {
  display: grid;
  grid-template-columns: 54px 1fr auto;
  align-items: baseline;
  gap: var(--sp-4);
  padding: clamp(6px, 1.2vw, 14px) 0;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-fast) var(--ease-out);
}
.menu__item a:hover { border-bottom-color: var(--c-line); }
.menu__num, .menu__deg {
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-text-mute);
}
.menu__num { color: var(--c-strand-a); }
.menu__name {
  font-family: var(--ff-display);
  font-weight: 500;
  font-size: clamp(28px, 5vw, 56px);
  line-height: 1.1;
  letter-spacing: -0.01em;
}
.menu__item a:hover .menu__name {
  background: var(--g-helix);
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
}
.menu__foot {
  max-width: var(--maxw);
  margin: var(--sp-6) auto 0;
  width: 100%;
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-text-mute);
}

/* --- Shell / section scaffolding ---------------------------------------- */

.shell { position: relative; z-index: 10; }

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

[hidden] { display: none !important; }

.sec { padding: var(--section-gap) 0; position: relative; }

.sec__grid {
  display: grid;
  grid-template-columns: 3fr 9fr;
  gap: var(--sp-6) var(--sp-4);
  align-items: start;
}
.sec__head, .sec__body { min-width: 0; }
.sec--alt .sec__grid { grid-template-columns: 9fr 3fr; }
.sec--alt .sec__en { font-size: clamp(26px, 2.6vw, 40px); }
.sec--alt .sec__head { order: 2; }
.sec--alt .sec__body { order: 1; }

.label {
  margin: 0;
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-family: var(--ff-mono);
  font-size: var(--fs-label);
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-text-sub);
}
.label::before {
  content: "";
  width: 0; height: 1px;
  background: var(--g-helix);
  transition: width var(--dur-slow) var(--ease-out);
}
.is-in .label::before { width: 28px; }
.label b { color: var(--c-strand-a); font-weight: 400; }
.label span { color: var(--c-text-mute); }

.sec__head .sec__en,
.sec__band .sec__en {
  margin: var(--sp-4) 0 0;
  font-family: var(--ff-display);
  font-weight: 500;
  font-size: var(--fs-h1);
  line-height: 1.15;
  letter-spacing: -0.01em;
}
.sec__head .sec__en em,
.sec__band .sec__en em {
  display: block;
  font-style: normal;
  background: var(--g-helix);
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
}

.lead {
  margin: 0;
  font-family: var(--ff-body);
  font-weight: 700;
  font-size: var(--fs-h2);
  line-height: 1.35;
}
.para {
  margin: var(--sp-5) 0 0;
  max-width: 62ch;
  color: var(--c-text-sub);
  font-size: var(--fs-body);
  line-height: 1.9;
}
.para strong { color: var(--c-text); font-weight: 500; }
.para--wide { max-width: none; }

/* 指定位置での改行。狭い画面では自然折り返しに任せる */
.br-lg { display: none; }
@media (min-width: 1024px) { .br-lg { display: inline; } }

/* --- Divider: double sine wave ------------------------------------------ */

.divider { width: 100%; height: 80px; overflow: hidden; opacity: 0.7; }
.divider svg { width: 100%; height: 100%; }
.divider path { fill: none; stroke-width: 1; }

/* --- CTA ----------------------------------------------------------------- */

.cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--ff-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-text);
}
.cta .brk { color: var(--c-text-mute); transition: transform var(--dur-base) var(--ease-out), color var(--dur-fast) var(--ease-out); }
.cta .brk--l { transform: translateX(0); }
.cta .brk--r { transform: translateX(0); }
.cta:hover .brk--l { transform: translateX(-4px); color: var(--c-strand-a); }
.cta:hover .brk--r { transform: translateX(4px);  color: var(--c-strand-b); }
.cta .arw { display: inline-block; transition: transform var(--dur-base) var(--ease-out); }
.cta:hover .arw { transform: translateX(5px) rotate(90deg); }
.cta:hover .cta__t {
  background: var(--g-helix);
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
}

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 52px;
  padding: 0 28px;
  border-radius: 0;
  background: var(--c-strand-a);
  color: var(--c-bg);
  font-family: var(--ff-mono);
  font-weight: 700;
  font-size: var(--fs-small);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transition: box-shadow var(--dur-base) var(--ease-out);
}
.btn::before {
  content: "";
  position: absolute; inset: 0;
  background: var(--g-helix);
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease-out);
}
.btn:hover::before { opacity: 1; }
.btn:hover { box-shadow: inset 0 0 24px rgba(5, 7, 13, 0.35), 0 0 36px var(--c-strand-a-dim); }
.btn span { position: relative; }

/* --- Hero ---------------------------------------------------------------- */

.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: end;
  padding: calc(var(--sp-10) + 40px) 0 var(--sp-9);
  overflow: hidden;
}
.hero__canvas {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  z-index: -1;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background: linear-gradient(100deg,
    rgba(5, 7, 13, 0.94) 0%,
    rgba(5, 7, 13, 0.82) 40%,
    rgba(5, 7, 13, 0.34) 70%,
    rgba(5, 7, 13, 0) 86%);
}
.hero__inner { position: relative; z-index: 1; }

.hero__eyebrow {
  margin: 0 0 var(--sp-5);
  display: inline-flex;
  align-items: center;
  gap: var(--sp-3);
  font-family: var(--ff-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-text-sub);
}
.hero__eyebrow i {
  width: 6px; height: 6px;
  background: var(--c-strand-a);
  box-shadow: 0 0 10px var(--c-strand-a);
  animation: pulse 2.4s var(--ease-inout) infinite;
}
@keyframes pulse { 50% { opacity: 0.25; } }

.hero__ja {
  margin: var(--sp-5) 0 0;
  max-width: 24ch;
  font-weight: 700;
  font-size: clamp(27px, 4.2vw, 58px);
  line-height: 1.45;
  letter-spacing: -0.01em;
  text-wrap: balance;
}
.hero__ja span { color: var(--c-strand-a); white-space: nowrap; }

.hero__meta {
  margin-top: var(--sp-7);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-3) var(--sp-6);
  padding-top: var(--sp-4);
  border-top: 1px solid var(--c-line);
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-text-mute);
}
.hero__build { color: var(--c-text-sub); }
.hero__build b { font-weight: 400; color: var(--c-strand-a); }

.hero__scroll {
  position: absolute;
  bottom: var(--sp-5); left: 50%;
  transform: translateX(-50%);
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--c-text-mute);
  animation: float 3.2s var(--ease-inout) infinite;
}
@keyframes float {
  0%, 100% { transform: translate(-50%, 0); }
  50%      { transform: translate(-50%, 8px); }
}

/* --- Section band（全幅セクションの見出し帯） ---------------------------- */

.sec__band {
  display: grid;
  grid-template-columns: 3fr 9fr;
  gap: var(--sp-4);
  align-items: end;
}
.sec__band .label { grid-column: 1 / -1; }
.sec__band .sec__en { grid-column: 1; margin-top: var(--sp-5); }
.sec__band .para { grid-column: 2; margin: 0; max-width: 58ch; justify-self: end; }

/* --- Products ------------------------------------------------------------ */

.products { display: grid; gap: var(--sp-7); margin-top: var(--sp-7); }
.products__row { display: grid; grid-template-columns: repeat(12, 1fr); }
.products__row:nth-child(odd)  .card { grid-column: 1 / span 11; }
.products__row:nth-child(even) .card { grid-column: 2 / span 11; }

/* カードは「ビジュアル : 本文」の2カラム。奇数行は左、偶数行は右にビジュアルを置く。 */
.card {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  column-gap: var(--sp-6);
  align-items: center;
  padding: var(--sp-5);
  border: 1px solid var(--c-line);
  border-radius: 4px;
  background: var(--c-bg-elev);
  transition: transform var(--dur-base) var(--ease-out),
              background var(--dur-base) var(--ease-out);
  transform-style: preserve-3d;
}
.card__body { grid-column: 2; grid-row: 1; }
.products__row:nth-child(even) .card { grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr); }
.products__row:nth-child(even) .card__vis { grid-column: 2; }
.products__row:nth-child(even) .card__body { grid-column: 1; }

.card::before {
  content: "";
  position: absolute; inset: -1px;
  border-radius: 4px;
  padding: 1px;
  background: var(--g-helix);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
          mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease-out);
  pointer-events: none;
}
.products .card:hover { background: var(--c-bg-elev-2); transform: perspective(1400px) rotateY(1.4deg); }
.products__row:nth-child(even) .card:hover { transform: perspective(1400px) rotateY(-1.4deg); }
.card:hover::before { opacity: 1; }

.card__vis {
  position: relative;
  grid-column: 1;
  grid-row: 1;
  align-self: center;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--c-line);
  background:
    radial-gradient(120% 90% at 50% 0%, rgba(46, 230, 214, 0.07), transparent 62%),
    radial-gradient(90% 80% at 100% 100%, rgba(138, 92, 255, 0.07), transparent 60%),
    #070A14;
  overflow: hidden;
}
/* 四隅のコーナーマーク（HUD の文法をプロダクト図にも通す） */
.card__vis::before {
  content: "";
  position: absolute;
  inset: 10px;
  z-index: 2;
  pointer-events: none;
  opacity: 0.5;
  background:
    linear-gradient(90deg,  var(--c-strand-a) 0 14px, transparent 14px) left top / 100% 1px no-repeat,
    linear-gradient(180deg, var(--c-strand-a) 0 14px, transparent 14px) left top / 1px 100% no-repeat,
    linear-gradient(270deg, var(--c-strand-b) 0 14px, transparent 14px) right bottom / 100% 1px no-repeat,
    linear-gradient(0deg,   var(--c-strand-b) 0 14px, transparent 14px) right bottom / 1px 100% no-repeat;
  transition: opacity var(--dur-base) var(--ease-out);
}
/* 走査線 */
.card__vis::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: repeating-linear-gradient(0deg, rgba(238, 242, 250, 0.028) 0 1px, transparent 1px 3px);
}
.card:hover .card__vis::before { opacity: 1; }
.card__vis svg {
  width: 100%; height: 100%; display: block;
  transition: transform var(--dur-slow) var(--ease-out);
}
.card:hover .card__vis svg { transform: scale(1.03); }

.card__id {
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-strand-a);
}
.card__name {
  margin: var(--sp-3) 0 0;
  font-family: var(--ff-display);
  font-weight: 500;
  font-size: var(--fs-h3);
  line-height: 1.5;
  letter-spacing: 0;
}
.card__desc {
  margin: var(--sp-3) 0 var(--sp-4);
  color: var(--c-text-sub);
  font-size: var(--fs-small);
  line-height: 1.85;
}
.tags { display: flex; flex-wrap: wrap; gap: var(--sp-2); margin-bottom: var(--sp-4); }
.tag {
  padding: 4px 10px;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-text-sub);
}

/* --- Approach: ascending spiral ----------------------------------------- */

.approach {
  margin-top: var(--sp-7);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-7);
  align-items: center;
}
.spiral { width: 100%; }
.spiral .sp-path { fill: none; stroke: var(--c-line); stroke-width: 1; }
.spiral .sp-rung { stroke: var(--c-line); stroke-width: 1; }
.spiral .sp-node { fill: var(--c-bg); stroke: var(--c-line-strong); stroke-width: 1.5; }

.steps { display: grid; gap: var(--sp-4); }
.step {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: var(--sp-4);
  padding: var(--sp-4) 0;
  border-top: 1px solid var(--c-line);
  opacity: 0.4;
  transition: opacity var(--dur-base) var(--ease-out);
}
.step.is-on { opacity: 1; }
.step__n {
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-text-mute);
}
.step.is-on .step__n { color: var(--c-strand-a); }
.step__t {
  margin: 0;
  font-family: var(--ff-display);
  font-weight: 500;
  font-size: var(--fs-h3);
  line-height: 1.4;
}
.step__d {
  margin: var(--sp-2) 0 0;
  color: var(--c-text-sub);
  font-size: var(--fs-small);
  line-height: 1.7;
}

/* --- Marquee ------------------------------------------------------------- */

.marquee {
  position: relative;
  overflow: hidden;
  padding: var(--sp-6) 0;
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
}
.marquee__track {
  display: flex;
  width: max-content;
  will-change: transform;
}
.marquee__set {
  display: flex;
  font-family: var(--ff-display);
  font-weight: 700;
  font-size: clamp(64px, 10vw, 160px);
  line-height: 1;
  letter-spacing: -0.01em;
  white-space: pre;
}
.marquee__c {
  display: inline-block;
  -webkit-text-stroke: 1px var(--c-line-strong);
  color: transparent;
  will-change: transform;
}
.marquee__c.fill-a { -webkit-text-stroke: 0; color: var(--c-strand-a); }
.marquee__c.fill-b { -webkit-text-stroke: 0; color: var(--c-strand-b); }

/* --- Technology ---------------------------------------------------------- */

.stack {
  margin-top: var(--sp-6);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--c-line);
  border-left: 1px solid var(--c-line);
}
.stack__i {
  display: grid;
  place-items: center;
  gap: var(--sp-2);
  padding: var(--sp-5) var(--sp-3);
  border-right: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-text-mute);
  transition: color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}
.stack__i svg { width: 22px; height: 22px; stroke: currentColor; fill: none; stroke-width: 1.5; }
.stack__i:hover { color: var(--c-text); background: var(--c-bg-elev); }

.metrics {
  margin-top: var(--sp-7);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--sp-5);
}
.metric { border-top: 1px solid var(--c-line); padding-top: var(--sp-4); }
.metric__v {
  font-family: var(--ff-mono);
  font-weight: 700;
  font-size: clamp(32px, 3.4vw, 48px);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  background: var(--g-helix);
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
}
.metric__k {
  margin-top: var(--sp-2);
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-text-mute);
}

/* --- Cases --------------------------------------------------------------- */

.cases {
  margin-top: var(--sp-6);
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(300px, 360px);
  gap: var(--sp-4);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: var(--sp-4);
  scrollbar-width: thin;
  scrollbar-color: var(--c-line-strong) transparent;
  -webkit-mask-image: linear-gradient(90deg, #000 0 90%, transparent 100%);
          mask-image: linear-gradient(90deg, #000 0 90%, transparent 100%);
}
.cases::-webkit-scrollbar { height: 2px; }
.cases::-webkit-scrollbar-thumb { background: var(--c-line-strong); }
.case {
  scroll-snap-align: start;
  padding: var(--sp-5);
  border: 1px solid var(--c-line);
  border-radius: 4px;
  background: var(--c-bg-elev);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  transition: background var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out);
}
.case:hover { background: var(--c-bg-elev-2); border-color: var(--c-line-strong); }
.case__sector {
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-strand-b);
}
.case__name { margin: 0; font-weight: 500; font-size: var(--fs-h3); line-height: 1.5; }
.case__res {
  margin: 0;
  color: var(--c-text-sub);
  font-size: var(--fs-small);
  line-height: 1.8;
}
.case__kpi {
  margin-top: auto;
  padding-top: var(--sp-3);
  border-top: 1px solid var(--c-line);
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-strand-a);
  font-variant-numeric: tabular-nums;
}

/* --- News list ----------------------------------------------------------- */

.news { margin-top: var(--sp-5); border-top: 1px solid var(--c-line); }
.news__i { position: relative; border-bottom: 1px solid var(--c-line); }
.news__i::after {
  content: "";
  position: absolute;
  left: 0; bottom: -1px;
  height: 1px; width: 0;
  background: var(--g-helix);
  transition: width var(--dur-base) var(--ease-out);
}
.news__i:has(a):hover::after { width: 100%; }
.news__i .news__row {
  display: grid;
  grid-template-columns: 120px 110px 1fr auto;
  gap: var(--sp-4);
  align-items: baseline;
  padding: var(--sp-5) 0;
}
.news__d {
  font-family: var(--ff-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.06em;
  color: var(--c-text-sub);
  font-variant-numeric: tabular-nums;
}
.news__tag {
  justify-self: start;
  padding: 3px 8px;
  border: 1px solid var(--c-line);
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-text-mute);
}
.news__tag--release { border-color: var(--c-strand-a); color: var(--c-strand-a); }
.news__t {
  margin: 0;
  font-weight: 500;
  font-size: var(--fs-small);
  line-height: 1.7;
  transition: transform var(--dur-base) var(--ease-out);
}
.news__i:has(a):hover .news__t { transform: translateX(8px); }
.news__arw { font-family: var(--ff-mono); color: var(--c-text-mute); }

/* --- Careers ------------------------------------------------------------- */

.frames {
  margin-top: var(--sp-6);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-4);
}
.frame {
  position: relative;
  margin: 0;
  aspect-ratio: 3 / 4;
  border: 1px solid var(--c-line);
  overflow: hidden;
  background: var(--c-bg-elev);
}
.frame svg { width: 100%; height: 100%; }
.frame::after {
  content: "";
  position: absolute; inset: 0;
  background-image: repeating-linear-gradient(
    to bottom,
    rgba(5, 7, 13, 0.32) 0 1px,
    transparent 1px 3px
  );
  pointer-events: none;
}
.frame figcaption {
  position: absolute;
  left: var(--sp-3); bottom: var(--sp-3);
  z-index: 2;
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-text-sub);
}

/* --- Contact ------------------------------------------------------------- */

.contact { text-align: left; }
.contact__big {
  margin: 0;
  font-family: var(--ff-display);
  font-weight: 700;
  font-size: var(--fs-hero);
  line-height: 1.05;
  letter-spacing: -0.02em;
}
.contact__big em {
  font-style: normal;
  background: var(--g-helix);
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
}
.contact__ja {
  margin: var(--sp-5) 0 var(--sp-7);
  font-weight: 700;
  font-size: var(--fs-h2);
  line-height: 1.5;
}
.contact__row { display: flex; flex-wrap: wrap; align-items: center; gap: var(--sp-6); }
.contact__mail {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin: var(--sp-6) 0 0;
  font-family: var(--ff-mono);
  font-size: var(--fs-small);
}
.contact__mail > span {
  font-size: var(--fs-label);
  letter-spacing: 0.14em;
  color: var(--c-text-mute);
}
.contact__mail a {
  color: var(--c-strand-a);
  border-bottom: 1px solid rgba(46, 230, 214, 0.3);
  transition: border-color var(--dur-base) var(--ease-out);
}
.contact__mail a:hover { border-bottom-color: var(--c-strand-a); }

/* --- Footer -------------------------------------------------------------- */

.footer {
  position: relative;
  z-index: 10;
  padding-top: var(--sp-8);
  border-top: 1px solid var(--c-line);
  overflow: hidden;
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--sp-6);
  padding-bottom: var(--sp-8);
}
.footer__tag {
  margin: var(--sp-4) 0 0;
  max-width: 30ch;
  color: var(--c-text-sub);
  font-size: var(--fs-small);
  line-height: 1.8;
}
.footer h3 {
  margin: 0 0 var(--sp-4);
  font-family: var(--ff-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-text-mute);
}
.footer__links { display: grid; gap: var(--sp-3); }
.footer__links a {
  font-family: var(--ff-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.06em;
  color: var(--c-text-sub);
  transition: color var(--dur-fast) var(--ease-out);
}
.footer__links a:hover { color: var(--c-strand-a); }

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--sp-3);
  padding: var(--sp-4) 0;
  border-top: 1px solid var(--c-line);
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-text-mute);
}
.footer__bottom nav { display: flex; gap: var(--sp-5); }

.footer__word {
  margin-top: var(--sp-6);
  font-family: var(--ff-display);
  font-weight: 700;
  font-size: clamp(64px, 17vw, 280px);
  line-height: 0.78;
  letter-spacing: -0.02em;
  text-align: center;
  white-space: nowrap;
  -webkit-text-stroke: 1px var(--c-line);
  color: transparent;
  margin-bottom: calc(clamp(64px, 17vw, 280px) * -0.34);
  user-select: none;
}

/* --- Reveal animation --------------------------------------------------- */

.rv {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
}
.is-in .rv, .rv.is-in { opacity: 1; transform: none; }
.is-in .rv:nth-child(2) { transition-delay: 80ms; }
.is-in .rv:nth-child(3) { transition-delay: 160ms; }
.is-in .rv:nth-child(4) { transition-delay: 240ms; }

/* --- Breakpoints --------------------------------------------------------- */

@media (max-width: 1023px) {
  .sec__grid, .sec--alt .sec__grid { grid-template-columns: 1fr; }
  .sec--alt .sec__head { order: 0; }
  .sec--alt .sec__body { order: 0; }
  .approach { grid-template-columns: 1fr; }
  .spiral { max-width: 420px; margin: 0 auto; }
  .sec__band { grid-template-columns: minmax(0, 1fr); align-items: start; }
  .sec__band .sec__en, .sec__band .para { grid-column: 1; }
  .sec__band .para { justify-self: start; max-width: none; margin-top: var(--sp-2); }
  .products { gap: var(--sp-6); }
  .products__row:nth-child(odd)  .card,
  .products__row:nth-child(even) .card { grid-column: 1 / -1; }
  .card,
  .products__row:nth-child(even) .card { grid-template-columns: minmax(0, 1fr); }
  .card__vis,
  .products__row:nth-child(even) .card__vis {
    grid-column: 1;
    grid-row: 1;
    margin-bottom: var(--sp-4);
  }
  .card__body,
  .products__row:nth-child(even) .card__body { grid-column: 1; grid-row: 2; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 767px) {
  .hud__vertical, .hud__coord, .rungs { display: none; }
  .rotword, .capsule__div:last-of-type, .capsule .mono-btn--contact { display: none; }
  .news__i .news__row { grid-template-columns: 1fr auto; row-gap: var(--sp-2); }
  .news__d { grid-column: 1; }
  .news__tag { grid-column: 2; grid-row: 1; }
  .news__t { grid-column: 1 / -1; }
  .news__arw { display: none; }
  .frames { grid-template-columns: 1fr; }
  .stack { grid-template-columns: repeat(2, 1fr); }
  .footer__grid { grid-template-columns: 1fr; }
  .footer__bottom { flex-direction: column; }
  .hero { padding-bottom: var(--sp-8); }
  .hero::before {
    background: linear-gradient(180deg,
      rgba(5, 7, 13, 0.55) 0%,
      rgba(5, 7, 13, 0.80) 45%,
      rgba(5, 7, 13, 0.94) 100%);
  }
  .hero__eyebrow { flex-wrap: wrap; font-size: 11px; letter-spacing: 0.1em; }
  .hero__ja { max-width: none; }
  .capsule { padding: 0 var(--sp-3); gap: var(--sp-3); }
  .marquee__set { font-size: clamp(44px, 14vw, 88px); }
}

/* --- Reduced motion ------------------------------------------------------ */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .rv { opacity: 1; transform: none; }
  .step { opacity: 1; }
  .label::before { width: 28px; }
}