/* =============================================================
   Nine consulting — style.css
   Design tokens in :root, then base + sections.
   Tone: premium dark / quiet luxury / aurora.
   ============================================================= */

/* ---------- Tokens ---------- */
:root {
  /* color — base */
  --bg:        #06080f;
  --bg-2:      #080b15;
  --bg-3:      #0b0f1c;
  --surface:   rgba(255, 255, 255, 0.025);
  --surface-2: rgba(255, 255, 255, 0.045);
  --line:      rgba(255, 255, 255, 0.10);
  --line-soft: rgba(255, 255, 255, 0.06);

  /* color — text */
  --text:       #e9ecf4;
  --text-dim:   rgba(233, 236, 244, 0.62);
  --text-faint: rgba(233, 236, 244, 0.40);
  --text-ghost: rgba(233, 236, 244, 0.24);

  /* color — aurora accents */
  --teal:    #34d6c6;
  --violet:  #7c6bff;
  --magenta: #e66bc8;
  --accent-grad: linear-gradient(100deg, var(--teal), var(--violet) 55%, var(--magenta));

  /* type */
  --font-jp:  "Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  --font-en:  "Manrope", "Zen Kaku Gothic New", sans-serif;

  /* fluid type scale */
  --fs-hero:    clamp(2.6rem, 6.2vw, 6rem);
  --fs-h2:      clamp(1.7rem, 3.4vw, 3rem);
  --fs-h3:      clamp(1.15rem, 1.7vw, 1.45rem);
  --fs-lead:    clamp(1.05rem, 1.7vw, 1.4rem);
  --fs-body:    clamp(0.95rem, 1.1vw, 1.02rem);
  --fs-small:   0.82rem;
  --fs-micro:   0.7rem;

  /* spacing */
  --gutter:   clamp(20px, 5vw, 64px);
  --maxw:     1180px;
  --sec-pad:  clamp(96px, 14vh, 200px);

  /* motion */
  --ease:     cubic-bezier(0.22, 0.61, 0.36, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur:      0.7s;
  --dur-fast: 0.35s;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-jp);
  font-size: var(--fs-body);
  line-height: 1.85;
  font-feature-settings: "palt" 1;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
body.nav-locked { overflow: hidden; }

a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
h1, h2, h3, p { margin: 0; }
::selection { background: rgba(124, 107, 255, 0.35); color: #fff; }

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

.en { font-family: var(--font-en); font-weight: 300; letter-spacing: 0.16em; }
.eyebrow {
  font-family: var(--font-en);
  font-size: var(--fs-micro);
  font-weight: 500;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.eyebrow .dot {
  display: inline-block; width: 5px; height: 5px; border-radius: 50%;
  background: var(--teal); margin-right: 0.9em; vertical-align: middle;
  box-shadow: 0 0 10px var(--teal);
}

/* gradient text accent */
.grad {
  background: var(--accent-grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}

/* ---------- Reveal animation ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity var(--dur) var(--ease-out), transform var(--dur) var(--ease-out);
  transition-delay: var(--d, 0s);
}
[data-reveal].is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
}

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: clamp(16px, 2.4vw, 26px) var(--gutter);
  transition: background var(--dur-fast) var(--ease), backdrop-filter var(--dur-fast) var(--ease),
              border-color var(--dur-fast) var(--ease), padding var(--dur-fast) var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: rgba(6, 8, 15, 0.72);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom-color: var(--line-soft);
  padding-top: 14px; padding-bottom: 14px;
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand .mark { width: 26px; height: 26px; flex: none; }
.brand .name {
  font-family: var(--font-en); font-weight: 500; font-size: 0.96rem;
  letter-spacing: 0.16em; color: var(--text);
}
.brand .name b { font-weight: 600; }
.brand .name .light { color: var(--text-dim); font-weight: 300; }

.nav { display: flex; align-items: center; gap: clamp(20px, 2.6vw, 40px); }
.nav a {
  position: relative; font-size: var(--fs-small); color: var(--text-dim);
  letter-spacing: 0.08em; transition: color var(--dur-fast) var(--ease);
}
.nav a .num { font-family: var(--font-en); font-size: 0.62rem; color: var(--text-ghost); margin-right: 0.55em; }
.nav a::after {
  content: ""; position: absolute; left: 0; bottom: -6px; width: 0; height: 1px;
  background: var(--accent-grad); transition: width var(--dur-fast) var(--ease);
}
.nav a:hover { color: var(--text); }
.nav a:hover::after { width: 100%; }

.nav-toggle { display: none; }

/* ============================================================
   Hero
   ============================================================ */
.hero {
  position: relative; min-height: 100svh;
  display: flex; align-items: center;
  overflow: hidden;
  /* CSS fallback gradient (also shows if WebGL is unavailable) */
  background:
    radial-gradient(120% 90% at 50% 8%, rgba(124, 107, 255, 0.30), transparent 55%),
    radial-gradient(90% 70% at 78% 22%, rgba(230, 107, 200, 0.20), transparent 60%),
    radial-gradient(100% 80% at 18% 30%, rgba(52, 214, 198, 0.22), transparent 60%),
    linear-gradient(180deg, #080b16, var(--bg));
}
#aurora { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.hero::after { /* legibility veil + fade into page */
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(180deg, rgba(6,8,15,0.30) 0%, rgba(6,8,15,0) 30%, rgba(6,8,15,0) 62%, var(--bg) 100%);
}

.hero-inner { position: relative; z-index: 2; width: 100%; will-change: transform, opacity; }
.hero-eyebrow { margin-bottom: clamp(22px, 4vh, 40px); }
.hero h1 {
  font-family: var(--font-jp);
  font-weight: 500;
  font-size: var(--fs-hero);
  line-height: 1.28;
  letter-spacing: 0.02em;
  text-wrap: balance;
}
.hero h1 .line { display: block; }
.hero h1 .accent { color: #fff; }
.hero .sub {
  margin-top: clamp(24px, 4vh, 40px);
  max-width: 30ch;
  color: var(--text-dim);
  font-size: var(--fs-lead);
  line-height: 1.9;
  font-weight: 300;
}
.hero .sub-en {
  margin-top: 18px;
  font-family: var(--font-en); font-weight: 300;
  letter-spacing: 0.14em; font-size: 0.82rem;
  color: var(--text-faint);
}

.scroll-cue {
  position: absolute; left: 50%; bottom: clamp(22px, 4vh, 40px); z-index: 3;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  font-family: var(--font-en); font-size: 0.6rem; letter-spacing: 0.34em;
  text-transform: uppercase; color: var(--text-faint);
}
.scroll-cue .track {
  width: 1px; height: 56px; overflow: hidden;
  background: var(--line);
}
.scroll-cue .track::after {
  content: ""; display: block; width: 100%; height: 40%;
  background: var(--teal);
  animation: cue 2.6s var(--ease) infinite;
}
@keyframes cue {
  0%   { transform: translateY(-100%); }
  60%  { transform: translateY(250%); }
  100% { transform: translateY(250%); }
}
@media (prefers-reduced-motion: reduce) { .scroll-cue .track::after { animation: none; } }

/* ============================================================
   Section scaffolding
   ============================================================ */
.section { position: relative; padding-block: var(--sec-pad); }
.section-head { display: flex; flex-direction: column; gap: 18px; margin-bottom: clamp(48px, 7vh, 92px); }
.section-head h2 {
  font-family: var(--font-jp); font-weight: 500; font-size: var(--fs-h2);
  line-height: 1.35; letter-spacing: 0.03em; text-wrap: balance;
}
.section-head .index {
  font-family: var(--font-en); font-size: 0.7rem; letter-spacing: 0.3em;
  color: var(--text-ghost);
}
.section-head .lead { max-width: 46ch; color: var(--text-dim); font-weight: 300; }

.hairline { height: 1px; background: var(--line-soft); border: 0; margin: 0; }

/* ============================================================
   01 — Domains  (abstract connected nodes)
   ============================================================ */
.domains { background:
    radial-gradient(80% 50% at 50% 0%, rgba(124,107,255,0.06), transparent 70%),
    var(--bg); }

.field { position: relative; }
.field-lines { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; z-index: 0; }
.field-lines path {
  fill: none; stroke: url(#nodeGrad); stroke-width: 1;
  stroke-dasharray: 5 7; opacity: 0.5;
  animation: flow 22s linear infinite;
}
@keyframes flow { to { stroke-dashoffset: -240; } }
@media (prefers-reduced-motion: reduce){ .field-lines path { animation: none; } }

.nodes {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: clamp(16px, 2vw, 28px);
}
.node {
  position: relative; padding: clamp(26px, 3vw, 40px) clamp(20px, 2vw, 30px) clamp(30px, 3.4vw, 44px);
  border: 1px solid var(--line-soft); border-radius: 18px;
  background: linear-gradient(180deg, var(--surface-2), var(--surface));
  overflow: hidden;
  transition: transform var(--dur) var(--ease-out), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.node::before { /* aurora wash, hidden until hover */
  content: ""; position: absolute; inset: 0; opacity: 0;
  background: radial-gradient(120% 80% at 50% 0%, rgba(124,107,255,0.18), transparent 60%);
  transition: opacity var(--dur) var(--ease);
}
.node:hover { transform: translateY(-6px); border-color: var(--line); }
.node:hover::before { opacity: 1; }

.node .orb {
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent-grad);
  box-shadow: 0 0 0 5px rgba(124,107,255,0.10), 0 0 22px rgba(124,107,255,0.55);
  margin-bottom: clamp(26px, 3vw, 40px);
  animation: pulse 5s var(--ease) infinite;
}
.node:nth-child(2) .orb { animation-delay: 1.2s; }
.node:nth-child(3) .orb { animation-delay: 2.4s; }
.node:nth-child(4) .orb { animation-delay: 3.6s; }
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 5px rgba(124,107,255,0.10), 0 0 18px rgba(124,107,255,0.4); }
  50%      { box-shadow: 0 0 0 7px rgba(124,107,255,0.05), 0 0 30px rgba(124,107,255,0.7); }
}
@media (prefers-reduced-motion: reduce){ .node .orb { animation: none; } }

.node .verb {
  font-family: var(--font-jp); font-weight: 500; font-size: var(--fs-h3);
  letter-spacing: 0.08em; color: var(--text); margin-bottom: 6px;
}
.node .label-en { font-family: var(--font-en); font-size: 0.62rem; letter-spacing: 0.26em;
  text-transform: uppercase; color: var(--text-ghost); margin-bottom: 18px; }
.node .desc { font-size: var(--fs-small); line-height: 1.85; color: var(--text-dim); font-weight: 300; }
.node .idx {
  position: absolute; top: clamp(20px, 2vw, 28px); right: clamp(20px, 2vw, 28px);
  font-family: var(--font-en); font-size: 0.62rem; letter-spacing: 0.2em; color: var(--text-ghost);
}

/* ============================================================
   02 — About (philosophy)
   ============================================================ */
.about { background: var(--bg-2); }
.about .statement {
  font-family: var(--font-jp); font-weight: 400;
  font-size: clamp(1.5rem, 3.4vw, 2.75rem); line-height: 1.7;
  letter-spacing: 0.04em; text-wrap: balance; max-width: 24ch;
}
.about .statement em { font-style: normal; color: var(--text); }
.about .statement .mute { color: var(--text-faint); }
.about-foot {
  margin-top: clamp(44px, 7vh, 88px); display: grid; grid-template-columns: 1fr 1fr;
  gap: clamp(28px, 4vw, 64px); max-width: 760px;
}
.about-foot p { color: var(--text-dim); font-weight: 300; font-size: var(--fs-small); }
.about-foot p .k {
  display: block; font-family: var(--font-en); font-size: 0.62rem; letter-spacing: 0.24em;
  text-transform: uppercase; color: var(--text-ghost); margin-bottom: 12px;
}

/* ============================================================
   03 — Company profile (the one concrete block)
   ============================================================ */
.profile { background: var(--bg); }
.profile-grid { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: clamp(40px, 6vw, 100px); align-items: start; }
.profile-aside .eyebrow { margin-bottom: 22px; }
.profile-aside h2 { font-family: var(--font-jp); font-weight: 500; font-size: var(--fs-h2); line-height: 1.35; }
.profile-aside .note { margin-top: 24px; color: var(--text-dim); font-weight: 300; font-size: var(--fs-small); max-width: 34ch; }

.spec { width: 100%; }
.spec dl { margin: 0; }
.spec .row {
  display: grid; grid-template-columns: 150px 1fr; gap: 24px;
  padding: clamp(18px, 2.2vw, 26px) 0; border-top: 1px solid var(--line-soft);
}
.spec .row:last-child { border-bottom: 1px solid var(--line-soft); }
.spec dt {
  font-size: var(--fs-small); color: var(--text-faint); letter-spacing: 0.06em;
  display: flex; align-items: baseline; gap: 10px;
}
.spec dt .en { font-size: 0.56rem; color: var(--text-ghost); letter-spacing: 0.2em; }
.spec dd { margin: 0; color: var(--text); font-weight: 300; }
.spec dd.ph { color: var(--text-faint); }   /* placeholder values */

/* ============================================================
   04 — News
   ============================================================ */
.news { background: var(--bg-2); }
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(16px, 2vw, 26px); }
.card {
  position: relative; display: flex; flex-direction: column;
  padding: clamp(24px, 2.6vw, 34px);
  border: 1px solid var(--line-soft); border-radius: 16px;
  background: var(--surface); min-height: 230px;
  transition: transform var(--dur) var(--ease-out), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.card:hover { transform: translateY(-5px); border-color: var(--line); background: var(--surface-2); }
.card .meta { display: flex; align-items: center; gap: 14px; margin-bottom: auto; }
.card .date { font-family: var(--font-en); font-size: 0.72rem; letter-spacing: 0.12em; color: var(--text-faint); }
.card .tag {
  font-size: 0.62rem; letter-spacing: 0.14em; padding: 4px 11px; border-radius: 999px;
  border: 1px solid var(--line); color: var(--text-dim);
}
.card h3 { margin-top: clamp(40px, 6vh, 72px); font-family: var(--font-jp); font-weight: 500;
  font-size: 1.02rem; line-height: 1.65; letter-spacing: 0.03em; color: var(--text); }
.card .arrow { margin-top: 18px; font-family: var(--font-en); font-size: 0.72rem; letter-spacing: 0.1em; color: var(--text-faint);
  transition: color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease); }
.card:hover .arrow { color: var(--teal); transform: translateX(4px); }
.news-more { margin-top: clamp(36px, 5vh, 56px); display: flex; justify-content: center; }

/* ============================================================
   05 — Contact
   ============================================================ */
.contact {
  position: relative; text-align: center; overflow: hidden;
  background:
    radial-gradient(90% 120% at 50% 120%, rgba(124,107,255,0.16), transparent 60%),
    radial-gradient(70% 90% at 50% 130%, rgba(52,214,198,0.12), transparent 60%),
    var(--bg);
}
.contact .eyebrow { justify-content: center; margin-bottom: 30px; }
.contact h2 {
  font-family: var(--font-jp); font-weight: 500;
  font-size: clamp(2rem, 5vw, 4rem); line-height: 1.3; letter-spacing: 0.03em; text-wrap: balance;
}
.contact .lead { margin: 28px auto 48px; max-width: 40ch; color: var(--text-dim); font-weight: 300; }

.btn {
  --bw: 1px;
  position: relative; display: inline-flex; align-items: center; gap: 14px;
  padding: 17px 34px; border-radius: 999px;
  font-family: var(--font-en); font-size: 0.84rem; letter-spacing: 0.1em; color: var(--text);
  background: var(--surface-2);
  border: var(--bw) solid var(--line);
  transition: border-color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease),
              transform var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}
.btn .ico { width: 16px; height: 16px; transition: transform var(--dur-fast) var(--ease); }
.btn:hover { border-color: transparent; background: rgba(124,107,255,0.10);
  box-shadow: inset 0 0 0 1px rgba(124,107,255,0.5), 0 0 38px rgba(124,107,255,0.22); transform: translateY(-2px); }
.btn:hover .ico { transform: translateX(4px); }
.btn.ghost { background: transparent; }

.contact .mail { margin-top: 26px; font-family: var(--font-en); font-size: 0.8rem; letter-spacing: 0.08em; color: var(--text-faint); }
.contact .mail a { color: var(--text-dim); border-bottom: 1px solid var(--line); padding-bottom: 2px; transition: color var(--dur-fast) var(--ease); }
.contact .mail a:hover { color: var(--teal); }

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--line-soft);
  padding: clamp(40px, 6vh, 64px) var(--gutter) clamp(28px, 4vh, 40px);
  background: var(--bg);
}
.footer-top { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.footer-brand { display: flex; align-items: center; gap: 12px; }
.footer-brand .mark { width: 22px; height: 22px; }
.footer-brand .name { font-family: var(--font-en); font-weight: 500; letter-spacing: 0.16em; font-size: 0.9rem; }
.footer-nav { display: flex; gap: clamp(16px, 2vw, 30px); flex-wrap: wrap; }
.footer-nav a { font-size: var(--fs-small); color: var(--text-dim); transition: color var(--dur-fast) var(--ease); }
.footer-nav a:hover { color: var(--text); }
.footer-bottom { margin-top: clamp(32px, 5vh, 52px); display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.footer-bottom small { font-size: var(--fs-micro); color: var(--text-ghost); letter-spacing: 0.06em; }
.footer-bottom .en { font-size: var(--fs-micro); color: var(--text-ghost); }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 980px) {
  .nodes { grid-template-columns: repeat(2, 1fr); }
  .news-grid { grid-template-columns: 1fr 1fr; }
  .profile-grid { grid-template-columns: 1fr; gap: 44px; }
  .about-foot { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .nav {
    position: fixed; inset: 0; z-index: 40;
    flex-direction: column; justify-content: center; gap: 30px;
    background: rgba(6, 8, 15, 0.92);
    backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    transform: translateY(-100%); opacity: 0; pointer-events: none;
    transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
  }
  .nav.is-open { transform: none; opacity: 1; pointer-events: auto; }
  .nav a { font-size: 1.15rem; }

  .nav-toggle {
    display: flex; flex-direction: column; gap: 5px; z-index: 60;
    width: 34px; height: 34px; align-items: center; justify-content: center;
    background: none; border: 0; cursor: pointer; padding: 0;
  }
  .nav-toggle span { display: block; width: 22px; height: 1.4px; background: var(--text); transition: transform 0.4s var(--ease), opacity 0.3s var(--ease); }
  .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.4px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.4px) rotate(-45deg); }

  .news-grid { grid-template-columns: 1fr; }
  .nodes { grid-template-columns: 1fr; }
  .field-lines { display: none; }
  .spec .row { grid-template-columns: 110px 1fr; gap: 16px; }
  .hero .sub { max-width: none; }

  /* About: モバイルでは手動改行を無効化し、全幅で自然に流す（不格好な折返し対策） */
  .about .statement { max-width: 100%; font-size: clamp(1.3rem, 5.4vw, 1.72rem); line-height: 1.85; }
  .about .statement br { display: none; }
}

@media (max-width: 420px) {
  .spec .row { grid-template-columns: 1fr; gap: 6px; }
  .spec dt { color: var(--text-ghost); }
}