/* =========================================================
   LEADCAST — Swiss / Tech Precision
   White-based · high-contrast · hairline grid · one accent
   ========================================================= */

:root {
  /* type */
  --font-display: 'Archivo', sans-serif;
  --font-body: 'IBM Plex Sans JP', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  /* color — paper white base, near-black ink, one electric accent */
  --paper:    #F7F8F8;
  --paper-2:  #EDEFEF;
  --ink:      #0B0D10;
  --ink-2:    #565A60;
  --ink-3:    #8A8E94;
  --line:     #DCDFE1;
  --line-2:   #C9CDD0;
  --accent:   #1B3CFF;
  --accent-d: #1430D8;
  --on-accent:#FFFFFF;

  /* layout */
  --container: 1320px;
  --gutter: clamp(20px, 5vw, 64px);
  --header-h: 76px;

  /* motion */
  --ease: cubic-bezier(.2, .7, .2, 1);
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.65;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

::selection { background: var(--accent); color: var(--on-accent); }

/* ---------- language visibility (set in JS, defaults to JA) ---------- */
/* default content is Japanese in markup; EN swapped by JS dictionary */

/* ---------- container & grid helpers ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* =========================================================
   Decorative overlays
   ========================================================= */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 2px; width: 0%;
  background: var(--accent);
  z-index: 200;
  transition: width .1s linear;
}

.grain {
  position: fixed; inset: 0;
  z-index: 150;
  pointer-events: none;
  opacity: .035;
  mix-blend-mode: multiply;
  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='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.sysreadout {
  position: fixed;
  bottom: 18px; right: 18px;
  z-index: 160;
  display: flex; align-items: center; gap: 8px;
  font-family: var(--font-mono);
  font-size: 10px; letter-spacing: .14em;
  color: var(--ink-3);
  background: color-mix(in srgb, var(--paper) 70%, transparent);
  backdrop-filter: blur(6px);
  padding: 6px 10px;
  border: 1px solid var(--line);
}
.sysreadout__dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 60%, transparent);
  animation: pulse 2.4s var(--ease) infinite;
}
.sysreadout__sep { opacity: .5; }
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 55%, transparent); }
  70%  { box-shadow: 0 0 0 7px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}

/* =========================================================
   Header
   ========================================================= */
.site-header {
  position: sticky; top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  transition: border-color .3s var(--ease);
}
.header__inner {
  display: flex; align-items: center; gap: 24px;
  height: var(--header-h);
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand__mark {
  width: 14px; height: 14px;
  background: var(--accent);
  /* precise notched square */
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}
.brand__word {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: .14em;
  font-size: 18px;
}
.brand__word--lg { font-size: clamp(34px, 7vw, 64px); letter-spacing: .04em; }

.nav { display: flex; gap: 26px; margin-left: auto; }
.nav__link {
  position: relative;
  display: inline-flex; align-items: baseline; gap: 6px;
  font-size: 14px; font-weight: 500;
  padding: 6px 0;
  color: var(--ink-2);
  transition: color .25s var(--ease);
}
.nav__num {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--accent);
  letter-spacing: .05em;
}
.nav__link::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 100%; height: 1px; background: var(--ink);
  transform: scaleX(0); transform-origin: left;
  transition: transform .35s var(--ease);
}
.nav__link:hover { color: var(--ink); }
.nav__link:hover::after { transform: scaleX(1); }

.header__actions { display: flex; align-items: center; gap: 16px; }

.lang-toggle {
  display: inline-flex; align-items: center; gap: 4px;
  font-family: var(--font-mono);
  font-size: 12px; letter-spacing: .08em;
  color: var(--ink-3);
  border: 1px solid var(--line);
  padding: 6px 10px;
  transition: border-color .25s var(--ease);
}
.lang-toggle:hover { border-color: var(--line-2); }
.lang-toggle__opt { transition: color .25s var(--ease); }
.lang-toggle__opt.is-active { color: var(--ink); font-weight: 600; }
.lang-toggle__slash { opacity: .5; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--font-body);
  font-weight: 500; font-size: 14px;
  letter-spacing: .02em;
  padding: 11px 22px;
  border: 1px solid transparent;
  transition: background .25s var(--ease), color .25s var(--ease),
              border-color .25s var(--ease), transform .25s var(--ease);
  white-space: nowrap;
}
.btn--lg { padding: 15px 30px; font-size: 15px; }
.btn--accent { background: var(--accent); color: var(--on-accent); }
.btn--accent:hover { background: var(--accent-d); transform: translateY(-2px); }
.btn--ghost { border-color: var(--line-2); color: var(--ink); }
.btn--ghost:hover { border-color: var(--ink); transform: translateY(-2px); }
.btn--invert { background: var(--paper); color: var(--ink); }
.btn--invert:hover { background: var(--accent); color: var(--on-accent); transform: translateY(-2px); }

.menu-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.menu-toggle span { width: 24px; height: 2px; background: var(--ink); transition: transform .3s var(--ease), opacity .3s var(--ease); }

/* =========================================================
   Hero
   ========================================================= */
.hero {
  position: relative;
  padding-top: clamp(56px, 11vw, 130px);
  padding-bottom: clamp(48px, 9vw, 110px);
  border-bottom: 1px solid var(--line);
  /* faint vertical hairline guides */
  background-image: linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 25% 100%;
  background-position: 0 0;
}
.hero::before {
  /* subtle corner gridlines accent at top-left */
  content: ""; position: absolute; inset: 0;
  background:
    linear-gradient(180deg, transparent calc(var(--header-h) * 0), transparent);
  pointer-events: none;
}
.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(180px, 230px);
  gap: clamp(24px, 5vw, 70px);
  align-items: end;
}
.kicker {
  display: inline-flex; align-items: center; gap: 12px;
  font-family: var(--font-mono);
  font-size: 12px; letter-spacing: .22em;
  color: var(--ink-2);
  margin-bottom: clamp(20px, 3vw, 34px);
}
.kicker__bar { width: 36px; height: 1px; background: var(--accent); }

.hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.7rem, 9.2vw, 7.2rem);
  line-height: .98;
  letter-spacing: -.02em;
  margin-bottom: clamp(26px, 4vw, 44px);
}
.hero__title .line { display: block; }
.accent-dot { color: var(--accent); }

.hero__lead {
  max-width: 46ch;
  font-size: clamp(1rem, 1.4vw, 1.18rem);
  color: var(--ink-2);
  line-height: 1.8;
  margin-bottom: clamp(28px, 4vw, 44px);
}
.hero__cta { display: flex; flex-wrap: wrap; gap: 14px; }

.hero__meta {
  border-left: 1px solid var(--line);
  padding-left: clamp(16px, 2vw, 26px);
  align-self: stretch;
  display: flex; flex-direction: column; justify-content: flex-end; gap: 30px;
}
.metalist { display: flex; flex-direction: column; gap: 14px; }
.metalist__row { display: flex; justify-content: space-between; gap: 12px; align-items: baseline; }
.metalist dt {
  font-family: var(--font-mono);
  font-size: 10px; letter-spacing: .14em; color: var(--ink-3);
}
.metalist dd {
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: .04em; color: var(--ink);
  text-align: right;
}
.hero__index {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 10px;
  letter-spacing: .22em; color: var(--ink-3);
  writing-mode: initial;
}
.hero__index-line {
  width: 1px; height: 34px; background: var(--ink-3);
  animation: scrollcue 2.2s var(--ease) infinite;
  transform-origin: top;
}
@keyframes scrollcue {
  0%, 100% { transform: scaleY(.3); opacity: .4; }
  50%      { transform: scaleY(1); opacity: 1; }
}

/* =========================================================
   Stats
   ========================================================= */
.stats { border-bottom: 1px solid var(--line); }
.stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.stat {
  padding: clamp(30px, 4vw, 52px) 0;
  border-left: 1px solid var(--line);
  padding-left: clamp(16px, 2vw, 28px);
}
.stat:first-child { border-left: none; padding-left: 0; }
.stat__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1;
  letter-spacing: -.02em;
  font-variant-numeric: tabular-nums;
}
.stat__label {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: .12em;
  color: var(--ink-2);
  text-transform: uppercase;
}

/* =========================================================
   Generic section
   ========================================================= */
.section { padding-block: clamp(72px, 11vw, 150px); }
.section--alt { background: var(--paper-2); }
.section__head {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas: "num title" ". intro";
  column-gap: clamp(16px, 3vw, 40px);
  row-gap: 18px;
  align-items: start;
  margin-bottom: clamp(44px, 6vw, 80px);
  max-width: 1100px;
}
.section__num {
  grid-area: num;
  font-family: var(--font-mono);
  font-size: 13px; font-weight: 500;
  color: var(--accent);
  letter-spacing: .1em;
  padding-top: .6em;
}
.section__num--light { color: var(--accent); }
.section__title {
  grid-area: title;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 5.2vw, 3.6rem);
  line-height: 1.02;
  letter-spacing: -.02em;
}
.section__intro {
  grid-area: intro;
  max-width: 60ch;
  font-size: clamp(1rem, 1.3vw, 1.12rem);
  color: var(--ink-2);
  line-height: 1.8;
}

/* ---------- Services (01) ---------- */
.services {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
}
.service {
  padding: clamp(28px, 3vw, 44px) clamp(20px, 2vw, 34px) clamp(34px, 4vw, 52px);
  border-left: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  position: relative;
  transition: background .3s var(--ease);
}
.service:first-child { border-left: none; }
.service:hover { background: color-mix(in srgb, var(--accent) 4%, transparent); }
.service__num {
  font-family: var(--font-mono);
  font-size: 12px; color: var(--accent); letter-spacing: .06em;
}
.service__title { margin: 22px 0 16px; }
.service__en {
  display: block;
  font-family: var(--font-display);
  font-weight: 700; font-size: 1.5rem;
  letter-spacing: -.01em; line-height: 1.15;
}
.service__ja {
  display: block;
  font-size: 13px; color: var(--ink-2);
  margin-top: 6px; letter-spacing: .04em;
}
.service__desc { color: var(--ink-2); font-size: .96rem; line-height: 1.8; }
.service__tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
.service__tags li {
  font-family: var(--font-mono);
  font-size: 10px; letter-spacing: .08em;
  color: var(--ink-2);
  border: 1px solid var(--line);
  padding: 4px 9px;
}

/* ---------- Principles (02) ---------- */
.principles {
  border-top: 1px solid var(--line-2);
}
.principle {
  display: grid;
  grid-template-columns: 90px minmax(0, 320px) 1fr;
  gap: clamp(14px, 3vw, 40px);
  align-items: baseline;
  padding: clamp(26px, 3.4vw, 44px) 0;
  border-bottom: 1px solid var(--line);
  transition: padding-left .35s var(--ease);
}
.principle:hover { padding-left: 14px; }
.principle__num {
  font-family: var(--font-mono);
  font-size: 13px; color: var(--accent); letter-spacing: .06em;
}
.principle__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.3rem, 2.4vw, 2rem);
  letter-spacing: -.01em; line-height: 1.1;
}
.principle__desc { color: var(--ink-2); line-height: 1.8; font-size: .98rem; }

/* ---------- Domains (03) ---------- */
.domains {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.domain {
  display: flex; flex-direction: column; gap: 14px;
  min-height: clamp(150px, 18vw, 220px);
  padding: clamp(22px, 2.4vw, 34px);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  justify-content: space-between;
  position: relative;
  overflow: hidden;
  transition: color .3s var(--ease);
}
.domain::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 100%; height: 2px; background: var(--accent);
  transform: scaleX(0); transform-origin: left;
  transition: transform .45s var(--ease);
}
.domain:hover::after { transform: scaleX(1); }
.domain__idx {
  font-family: var(--font-mono);
  font-size: 11px; color: var(--ink-3); letter-spacing: .1em;
}
.domain__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.25rem, 2.2vw, 1.9rem);
  letter-spacing: -.01em; line-height: 1.1;
}

/* ---------- News (04) ---------- */
.news { border-top: 1px solid var(--line-2); }
.news__item { border-bottom: 1px solid var(--line); }
.news__link {
  display: grid;
  grid-template-columns: 130px 90px 1fr auto;
  gap: clamp(12px, 2vw, 28px);
  align-items: center;
  padding: clamp(20px, 2.4vw, 30px) 0;
  transition: padding-left .35s var(--ease);
}
.news__link:hover { padding-left: 14px; }
.news__date { font-family: var(--font-mono); font-size: 12px; color: var(--ink-2); letter-spacing: .04em; }
.news__cat {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: .12em;
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  padding: 3px 8px; justify-self: start;
}
.news__title { font-size: 1.05rem; font-weight: 500; line-height: 1.5; }
.news__arrow { color: var(--ink-3); transition: transform .3s var(--ease), color .3s var(--ease); }
.news__link:hover .news__arrow { transform: translateX(6px); color: var(--accent); }

/* =========================================================
   CTA — single high-contrast ink block
   ========================================================= */
.cta {
  background: var(--ink);
  color: var(--paper);
  padding-block: clamp(80px, 13vw, 170px);
  position: relative;
  overflow: hidden;
}
.cta::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size: 8.333% 100%;
  pointer-events: none;
  opacity: .6;
}
.cta__inner { position: relative; }
.cta .section__num--light { color: var(--accent); display: inline-block; margin-bottom: 26px; }
.cta__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.4rem, 8vw, 6rem);
  line-height: 1; letter-spacing: -.02em;
  margin-bottom: 30px;
}
.cta__title .line { display: block; }
.cta__lead { max-width: 48ch; color: color-mix(in srgb, var(--paper) 72%, transparent); font-size: 1.1rem; line-height: 1.8; margin-bottom: 40px; }
.cta__actions { display: flex; flex-wrap: wrap; align-items: center; gap: 24px; }
.cta__addr {
  font-family: var(--font-mono);
  font-size: 13px; letter-spacing: .04em; line-height: 1.65;
  color: color-mix(in srgb, var(--paper) 60%, transparent);
  max-width: 34ch;
}

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
  background: var(--paper);
  padding-top: clamp(50px, 7vw, 90px);
  padding-bottom: 30px;
  border-top: 1px solid var(--line);
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  padding-bottom: clamp(40px, 6vw, 80px);
  border-bottom: 1px solid var(--line);
}
.footer__brand .brand__word--lg {
  font-family: var(--font-display);
  display: block;
}
.footer__tag { color: var(--ink-2); margin-top: 12px; font-size: .95rem; }
.footer__nav { display: flex; flex-direction: column; gap: 12px; }
.footer__nav a { color: var(--ink-2); font-size: .95rem; transition: color .25s var(--ease); width: max-content; }
.footer__nav a:hover { color: var(--accent); }
.footer__meta { font-family: var(--font-mono); font-size: 13px; color: var(--ink-2); display: flex; flex-direction: column; gap: 10px; }
.footer__bottom {
  display: flex; align-items: center; gap: 18px;
  padding-top: 26px;
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: .06em;
  color: var(--ink-3);
}
.footer__rule { flex: 1; height: 1px; background: var(--line); }

/* =========================================================
   Reveal animation
   ========================================================= */
/* hidden state applies only when JS is active (html.js); no-JS shows everything */
.js .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .8s var(--ease), transform .8s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}
.js .reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .sysreadout__dot, .hero__index-line { animation: none; }
  .scroll-progress { display: none; }
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 1024px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__meta { border-left: none; border-top: 1px solid var(--line); padding-left: 0; padding-top: 24px; flex-direction: row; flex-wrap: wrap; justify-content: space-between; align-items: flex-start; }
  .metalist { flex: 1; min-width: 240px; }
  .principle { grid-template-columns: 60px 1fr; grid-template-areas: "num title" ". desc"; row-gap: 14px; }
  .principle__desc { grid-column: 2; }
}

@media (max-width: 860px) {
  :root { --header-h: 64px; }
  .nav {
    position: fixed; inset: var(--header-h) 0 auto 0;
    flex-direction: column; gap: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 8px var(--gutter) 24px;
    transform: translateY(-120%);
    transition: transform .4s var(--ease);
    margin-left: 0;
  }
  body.is-menu-open .nav { transform: translateY(0); }
  .nav__link { padding: 16px 0; border-bottom: 1px solid var(--line); font-size: 1.1rem; width: 100%; }
  .nav__link::after { display: none; }
  .header__actions .btn--accent { display: none; }
  .menu-toggle { display: flex; margin-left: auto; }
  body.is-menu-open .menu-toggle span:first-child { transform: translateY(3.5px) rotate(45deg); }
  body.is-menu-open .menu-toggle span:last-child { transform: translateY(-3.5px) rotate(-45deg); }

  .services { grid-template-columns: 1fr; }
  .service { border-left: none; }
  .domains { grid-template-columns: repeat(2, 1fr); }
  .stats__grid { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3) { border-left: none; padding-left: 0; }
  .stat { padding-left: clamp(14px, 4vw, 28px); }
  .stat:nth-child(odd) { border-left: none; padding-left: 0; }

  .news__link { grid-template-columns: 1fr auto; grid-template-areas: "date cat" "title arrow"; row-gap: 10px; }
  .news__date { grid-area: date; }
  .news__cat { grid-area: cat; justify-self: end; }
  .news__title { grid-area: title; }
  .news__arrow { grid-area: arrow; }

  .footer__grid { grid-template-columns: 1fr; gap: 32px; }
  .section__head { grid-template-columns: 1fr; grid-template-areas: "num" "title" "intro"; }
  .section__num { padding-top: 0; }
}

@media (max-width: 480px) {
  .domains { grid-template-columns: 1fr; }
  .sysreadout { display: none; }
  .hero__cta .btn, .cta__actions .btn { width: 100%; }
}