/* ============================================================
   CORE STILL — Design System
   Precision Creates Power.
   ============================================================ */

:root {
  --black:      #0A0A0A;
  --graphite:   #1A1A1C;
  --white:      #FFFFFF;
  --off-white:  #F7F7F8;
  --mid-gray:   #6B6B70;
  --light-gray: #E8E8EA;
  --silver:     #B8BCC2;

  --maxw: 1240px;
  --gutter: clamp(24px, 5vw, 80px);

  --serif: "Times New Roman", "Hiragino Mincho ProN", serif;
  --sans:  "Helvetica Neue", "Inter", "Hiragino Kaku Gothic ProN",
           "Noto Sans JP", "Yu Gothic", sans-serif;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--sans);
  color: var(--black);
  background: var(--white);
  line-height: 1.8;
  letter-spacing: 0.04em;
  font-weight: 300;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
ul { list-style: none; }

/* ---------- typography ---------- */
.eyebrow {
  font-size: 0.72rem;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--silver);
  font-weight: 400;
}
.display {
  font-family: var(--sans);
  font-weight: 200;
  letter-spacing: 0.02em;
  line-height: 1.1;
  font-size: clamp(2.4rem, 6vw, 5.2rem);
}
h2.section-title {
  font-weight: 200;
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1.25;
  letter-spacing: 0.02em;
}
h3 { font-weight: 300; letter-spacing: 0.06em; }
p.lead { font-size: clamp(1rem, 1.4vw, 1.18rem); color: inherit; }
.muted { color: var(--mid-gray); }

/* ---------- layout ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }
section { padding: clamp(90px, 14vh, 200px) 0; position: relative; }
.section-dark  { background: var(--black);    color: var(--white); }
.section-graph { background: var(--graphite);  color: var(--white); }
.section-light { background: var(--white);     color: var(--black); }
.section-off   { background: var(--off-white); color: var(--black); }

/* ---------- header ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 22px var(--gutter);
  transition: background 0.5s var(--ease), padding 0.5s var(--ease);
  mix-blend-mode: difference;
}
.site-header.scrolled { padding: 14px var(--gutter); }
.site-header:has(.nav.open) { mix-blend-mode: normal; }
.brand {
  font-size: 0.92rem; letter-spacing: 0.34em; font-weight: 400;
  color: #fff;
}
.nav { display: flex; gap: clamp(20px, 3vw, 46px); }
.nav a {
  font-size: 0.74rem; letter-spacing: 0.22em; text-transform: uppercase;
  color: #fff; position: relative; padding: 4px 0;
}
.nav a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 1px; width: 0;
  background: #fff; transition: width 0.4s var(--ease);
}
.nav a:hover::after, .nav a.active::after { width: 100%; }
.nav-toggle { display: none; }

/* ---------- logo lockup ---------- */
.logo-lockup { display: flex; flex-direction: column; align-items: center; gap: 22px; }
.logo-lockup .blade {
  width: min(560px, 68vw); height: 14px; display: block;
  transform: scaleX(0); transform-origin: center;
  transition: transform 1.6s var(--ease);
  filter: drop-shadow(0 0 7px rgba(255,255,255,0.45));
}
.logo-lockup.in .blade { transform: scaleX(1); }
.logo-lockup .word {
  font-size: clamp(1.8rem, 5vw, 3.6rem); font-weight: 400;
  letter-spacing: clamp(0.18em, 0.6vw, 0.34em); color: #fff; line-height: 1;
  padding-left: clamp(0.18em, 0.6vw, 0.34em);
}
.logo-lockup.small .blade { width: 200px; height: 9px; filter: drop-shadow(0 0 4px rgba(255,255,255,0.4)); }
.logo-lockup.small .word { font-size: 1.2rem; letter-spacing: 0.3em; padding-left: 0.3em; }
.logo-lockup.left { align-items: flex-start; gap: 14px; }
.logo-lockup.static .blade { transform: scaleX(1); }

/* ---------- hero ---------- */
.hero {
  height: 100vh; min-height: 620px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; position: relative; overflow: hidden;
  background: var(--black); color: #fff;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(circle at 50% 40%, rgba(184,188,194,0.10), transparent 60%);
}
.hero-grid {
  position: absolute; inset: -2px; z-index: 0; opacity: 0.35;
  background-image:
    linear-gradient(rgba(184,188,194,0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(184,188,194,0.08) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(circle at 50% 45%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(circle at 50% 45%, #000 30%, transparent 75%);
}
.hero-canvas {
  position: absolute; inset: 0; z-index: 1; width: 100%; height: 100%;
  display: block; pointer-events: none;
  mask-image: radial-gradient(circle at 50% 46%, #000 32%, transparent 80%);
  -webkit-mask-image: radial-gradient(circle at 50% 46%, #000 32%, transparent 80%);
}
.hero-content { position: relative; z-index: 2; padding: 0 var(--gutter); }
.hero .display { margin: 0.4em 0 0.5em; }
.hero-sub {
  font-size: clamp(0.92rem, 1.4vw, 1.12rem); color: var(--silver);
  letter-spacing: 0.18em; font-weight: 300;
}
.hero-sub .en { display: block; font-size: 0.78rem; letter-spacing: 0.3em; margin-top: 10px; color: rgba(255,255,255,0.5); }
.scroll-cue {
  position: absolute; bottom: 38px; left: 50%; transform: translateX(-50%);
  z-index: 2; width: 1px; height: 56px; background: var(--silver);
  animation: cue 2.4s var(--ease) infinite;
}
@keyframes cue {
  0%, 100% { opacity: 0.15; transform: translateX(-50%) scaleY(0.4); transform-origin: top; }
  50% { opacity: 0.9; transform: translateX(-50%) scaleY(1); transform-origin: top; }
}

/* ---------- reusable bits ---------- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(40px, 6vw, 100px); align-items: center; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(28px, 4vw, 64px); }
.grid-4 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--light-gray); }

.measure { max-width: 40ch; }
.center { text-align: center; margin-left: auto; margin-right: auto; }
.spaced > * + * { margin-top: 1.4em; }

/* pillars */
.pillar { text-align: center; }
.pillar .num {
  font-size: clamp(2.4rem, 5vw, 4rem); font-weight: 100;
  color: var(--silver); letter-spacing: 0.06em; line-height: 1;
}
.pillar .en { display:block; font-size: 0.74rem; letter-spacing: 0.32em; text-transform: uppercase; margin: 18px 0 6px; }
.pillar h3 { font-size: 1.15rem; margin-bottom: 10px; }
.pillar p { font-size: 0.92rem; color: var(--mid-gray); }
.section-dark .pillar p, .section-graph .pillar p { color: rgba(255,255,255,0.55); }

/* service cards (TOP) */
.svc-card {
  background: var(--white); padding: clamp(34px, 4vw, 56px);
  display: flex; flex-direction: column; gap: 14px; min-height: 250px;
  transition: background 0.5s var(--ease), color 0.5s var(--ease);
  position: relative;
}
.svc-card:hover { background: var(--black); color: #fff; }
.svc-card .idx { font-size: 0.78rem; letter-spacing: 0.3em; color: var(--silver); }
.svc-card .en { font-size: 1.05rem; letter-spacing: 0.18em; font-weight: 400; }
.svc-card .jp { font-size: 0.92rem; color: var(--mid-gray); margin-top: auto; }
.svc-card:hover .jp { color: rgba(255,255,255,0.6); }
.svc-card::after {
  content: "→"; position: absolute; right: clamp(34px, 4vw, 56px); bottom: clamp(34px, 4vw, 56px);
  font-size: 1rem; color: var(--silver); opacity: 0; transform: translateX(-8px);
  transition: opacity 0.45s var(--ease), transform 0.45s var(--ease);
}
.svc-card:hover::after { opacity: 1; transform: translateX(0); }

/* audience columns */
.aud { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; }
.aud-col { padding: clamp(28px, 3vw, 50px); border-left: 1px solid rgba(184,188,194,0.18); }
.aud-col:first-child { border-left: none; }
.aud-col .en { font-size: 0.72rem; letter-spacing: 0.3em; color: var(--silver); text-transform: uppercase; }
.aud-col h3 { font-size: 1.3rem; margin: 14px 0 18px; font-weight: 200; }
.aud-col p { font-size: 0.92rem; color: rgba(255,255,255,0.6); }
.section-light .aud-col, .section-off .aud-col { border-left-color: var(--light-gray); }
.section-light .aud-col p, .section-off .aud-col p { color: var(--mid-gray); }

/* ecosystem loop */
.loop-wrap { display: flex; justify-content: center; margin-top: 72px; }
.loop-svg { width: min(440px, 84vw); height: auto; overflow: visible; }
.loop-svg .ring { fill: none; stroke: rgba(184,188,194,0.45); stroke-width: 1; }
.loop-svg .arrow { fill: var(--silver); }
.loop-svg .node { fill: var(--black); stroke: var(--silver); stroke-width: 1.2; }
.loop-svg .label { fill: rgba(255,255,255,0.85); font-size: 11px; letter-spacing: 0.26em; font-weight: 400; }
.loop-svg .label-jp { fill: rgba(255,255,255,0.45); font-size: 10px; letter-spacing: 0.12em; }
.loop-svg .runner { fill: #fff; }
.loop-svg .core-dot { fill: var(--silver); }
.loop-svg .core-label { fill: rgba(255,255,255,0.7); font-size: 9px; letter-spacing: 0.3em; }

/* service detail blocks */
.svc-detail { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: clamp(36px, 6vw, 90px); align-items: start; }
.svc-detail .idx-big { font-size: clamp(3rem, 8vw, 7rem); font-weight: 100; color: var(--silver); line-height: 0.9; }
.svc-detail .en { font-size: 0.78rem; letter-spacing: 0.3em; text-transform: uppercase; color: var(--silver); margin-top: 18px; }
.svc-steps { display: flex; flex-direction: column; gap: 30px; }
.svc-step .label { font-size: 0.72rem; letter-spacing: 0.28em; text-transform: uppercase; color: var(--silver); margin-bottom: 8px; }
.svc-step p { font-size: 1.05rem; font-weight: 300; }

/* profile */
.profile { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: clamp(40px, 6vw, 90px); align-items: center; }
.profile-photo { background: var(--off-white); aspect-ratio: 4/5; overflow: hidden; }
.profile-photo img { width: 100%; height: 100%; object-fit: cover; filter: grayscale(100%) contrast(1.02); }
.profile .name { font-size: 1.8rem; font-weight: 200; letter-spacing: 0.08em; }
.profile .name-en { font-size: 0.82rem; letter-spacing: 0.34em; text-transform: uppercase; color: var(--mid-gray); margin-top: 10px; }
.profile .title { font-size: 0.8rem; letter-spacing: 0.18em; color: var(--silver); margin: 14px 0 28px; text-transform: uppercase; }

/* CTA */
.cta-band { text-align: center; }
.cta-band .display { margin-bottom: 0.6em; }
.btn {
  display: inline-block; padding: 16px 46px; font-size: 0.76rem;
  letter-spacing: 0.28em; text-transform: uppercase;
  border: 1px solid var(--silver); color: inherit; background: transparent;
  font-family: var(--sans); font-weight: 300; cursor: pointer;
  transition: all 0.45s var(--ease); position: relative; overflow: hidden;
}
.btn:hover { background: var(--silver); color: var(--black); border-color: var(--silver); }
.section-light .btn:hover, .section-off .btn:hover { background: var(--black); color: #fff; border-color: var(--black); }

/* google form embed */
.gform-embed { max-width: 720px; margin: 0 auto; }
.gform-embed iframe {
  width: 100%; height: 920px; border: none; display: block;
  margin: 0; padding: 0; background: var(--white);
}
@media (max-width: 600px) {
  .gform-embed iframe { height: 1180px; }
}

/* form */
.form { max-width: 640px; margin: 0 auto; }
.field { margin-bottom: 34px; }
.field label { display: block; font-size: 0.72rem; letter-spacing: 0.22em; text-transform: uppercase; color: var(--mid-gray); margin-bottom: 12px; }
.field input, .field textarea, .field select {
  width: 100%; background: transparent; border: none; border-bottom: 1px solid var(--light-gray);
  padding: 12px 0; font-family: var(--sans); font-size: 1rem; color: var(--black);
  font-weight: 300; transition: border-color 0.4s var(--ease);
}
.field input:focus, .field textarea:focus, .field select:focus { outline: none; border-color: var(--black); }
.field textarea { resize: vertical; min-height: 120px; }
.seg { display: flex; gap: 12px; flex-wrap: wrap; }
.seg label {
  flex: 1; min-width: 140px; text-align: center; padding: 14px; cursor: pointer;
  border: 1px solid var(--light-gray); letter-spacing: 0.1em; font-size: 0.84rem;
  text-transform: none; color: var(--black); transition: all 0.4s var(--ease); margin: 0;
}
.seg input { display: none; }
.seg input:checked + span { font-weight: 400; }
.seg label:has(input:checked) { border-color: var(--black); background: var(--black); color: #fff; }

/* footer */
.site-footer { background: var(--black); color: #fff; padding: 80px var(--gutter) 48px; }
.footer-top { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 40px; max-width: var(--maxw); margin: 0 auto; }
.footer-brand { font-size: 1.2rem; letter-spacing: 0.3em; }
.footer-tag { color: var(--silver); font-size: 0.82rem; letter-spacing: 0.1em; margin-top: 14px; }
.footer-nav { display: flex; flex-direction: column; gap: 14px; }
.footer-nav a { font-size: 0.74rem; letter-spacing: 0.2em; text-transform: uppercase; color: rgba(255,255,255,0.7); }
.footer-nav a:hover { color: #fff; }
.footer-contact { display: flex; flex-direction: column; gap: 16px; }
.footer-contact .mail { font-size: 0.82rem; letter-spacing: 0.08em; color: #fff; }
.footer-contact .mail:hover { color: var(--silver); }
.footer-social { display: flex; flex-direction: column; gap: 14px; }
.footer-social a { display: inline-flex; align-items: center; gap: 11px; font-size: 0.74rem; letter-spacing: 0.14em; color: rgba(255,255,255,0.6); }
.footer-social a:hover { color: #fff; }
.footer-social .ig-icon { width: 19px; height: 19px; flex: none; color: rgba(255,255,255,0.72); transition: color 0.3s var(--ease); }
.footer-social a:hover .ig-icon { color: #fff; }
.footer-bottom { max-width: var(--maxw); margin: 60px auto 0; padding-top: 28px; border-top: 1px solid rgba(255,255,255,0.12); font-size: 0.72rem; letter-spacing: 0.12em; color: rgba(255,255,255,0.4); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }

/* page hero (sub pages) */
.page-hero { height: 56vh; min-height: 420px; display: flex; align-items: center; background: var(--black); color: #fff; position: relative; overflow: hidden; }
.page-hero .hero-grid { opacity: 0.25; }
.page-hero .wrap { position: relative; z-index: 2; }
.page-hero .display { font-size: clamp(2.2rem, 5vw, 4.2rem); }

/* ---------- scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(36px); transition: opacity 1s var(--ease), transform 1s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: 0.12s; }
.reveal.d2 { transition-delay: 0.24s; }
.reveal.d3 { transition-delay: 0.36s; }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .grid-2, .profile, .svc-detail { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr; gap: 44px; }
  .grid-4 { grid-template-columns: 1fr; }
  .aud { grid-template-columns: 1fr; }
  .aud-col { border-left: none; border-top: 1px solid rgba(184,188,194,0.18); }
  .aud-col:first-child { border-top: none; }
  .nav { display: none; }
  .nav.open {
    display: flex; flex-direction: column; position: fixed; inset: 0;
    background: var(--black); align-items: center; justify-content: center; gap: 32px; z-index: 99;
  }
  .nav.open a { font-size: 1.1rem; }
  .nav-toggle { display: block; z-index: 101; background: none; border: none; cursor: pointer; width: 28px; height: 18px; position: relative; }
  .nav-toggle span { position: absolute; left: 0; width: 100%; height: 1.5px; background: #fff; transition: 0.4s var(--ease); mix-blend-mode: difference; }
  .nav-toggle span:nth-child(1) { top: 0; }
  .nav-toggle span:nth-child(2) { top: 50%; }
  .nav-toggle span:nth-child(3) { bottom: 0; }
  .nav-toggle.open span:nth-child(1) { top: 50%; transform: rotate(45deg); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { bottom: 50%; transform: rotate(-45deg); }
}