:root {
  --ink: #111110;
  --ink-muted: #555450;
  --ink-faint: #999790;
  --paper: #f7f6f3;
  --paper-warm: #f0eeea;
  --line: rgba(17,17,16,0.1);
  --sans: 'DM Sans', 'Noto Sans JP', sans-serif;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 140%; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  overflow-x: hidden;
  cursor: none;
}

#cursor {
  position: fixed;
  width: 6px; height: 6px;
  background: #fff;
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  mix-blend-mode: difference;
}
#cursor-ring {
  position: fixed;
  width: 32px; height: 32px;
  border: 0.5px solid #fff;
  border-radius: 50%;
  pointer-events: none;
  z-index: 9998;
  transform: translate(-50%, -50%);
  opacity: 0.5;
  transition: width 0.4s ease, height 0.4s ease;
  mix-blend-mode: difference;
}

nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 1.6rem 2.4rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: linear-gradient(to bottom, rgba(255,255,255,0.65) 0%, transparent 100%);
}
.nav-logo {
  font-family: var(--sans);
  font-weight: 300;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--ink);
  text-decoration: none;
  opacity: 0.75;
  transition: opacity 0.3s;
}
.nav-logo:hover { opacity: 1; }
.nav-links { display: flex; gap: 2rem; list-style: none; }
.nav-link {
  font-family: var(--sans);
  font-weight: 300;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  opacity: 0.45;
  transition: opacity 0.3s;
  position: relative;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0; right: 0;
  height: 0.5px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}
.nav-link:hover { opacity: 1; }
.nav-link:hover::after { transform: scaleX(1); }

#hero {
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}
#p5-canvas-wrapper {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
}
#p5-canvas-wrapper canvas {
  display: block;
  position: absolute;
  top: 0; left: 0;
  width: 100% !important;
  height: 100% !important;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: flex-start;
  padding: 3rem 2.4rem;
  pointer-events: none;
  z-index: 10;
}
.hero-statement {
  opacity: 0;
  transform: translateY(16px);
  animation: fadeUp 1.4s cubic-bezier(0.16,1,0.3,1) 0.5s forwards;
}
.hero-en {
  font-family: var(--sans);
  font-weight: 200;
  font-size: clamp(1.4rem, 3vw, 2.6rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--ink);
  mix-blend-mode: multiply;
}
.hero-ja {
  margin-top: 0.6rem;
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 200;
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  color: var(--ink-muted);
  mix-blend-mode: multiply;
}

.scroll-hint {
  position: absolute;
  bottom: 2rem; right: 2.4rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  opacity: 0;
  animation: fadeIn 1s ease 2s forwards;
  z-index: 10;
}
.scroll-hint span {
  font-size: 0.58rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--ink-faint);
  writing-mode: vertical-rl;
}
.scroll-line {
  width: 0.5px; height: 36px;
  background: var(--ink-faint);
  animation: scrollPulse 2.2s ease-in-out 2s infinite;
}
@keyframes scrollPulse { 0%,100%{opacity:.3} 50%{opacity:.8} }
@keyframes fadeUp { to{opacity:1;transform:translateY(0)} }
@keyframes fadeIn { to{opacity:1} }

#sections { background: var(--paper); position: relative; z-index: 20; }
.sections-header {
  padding: 5rem 2.4rem 2.8rem;
  border-bottom: 0.5px solid var(--line);
}
.sections-label {
  font-weight: 300;
  font-size: 0.62rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.sections-grid { display: grid; grid-template-columns: repeat(4,1fr); }

.section-card {
  display: block;
  padding: 3rem 2.4rem;
  border-right: 0.5px solid var(--line);
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
  transition: background 0.4s ease;
}
.section-card:last-child { border-right: none; }
.section-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 0.5px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s cubic-bezier(0.16,1,0.3,1);
}
.section-card:hover::before { transform: scaleX(1); }
.section-card:hover { background: var(--paper-warm); }

.section-num {
  font-weight: 300; font-size: 0.6rem;
  letter-spacing: 0.22em; color: var(--ink-faint);
  display: block; margin-bottom: 2rem;
}
.section-title {
  font-weight: 300; font-size: 1.35rem; letter-spacing: 0.01em;
  display: block; margin-bottom: 0.5rem;
  transition: letter-spacing 0.4s ease;
}
.section-card:hover .section-title { letter-spacing: 0.04em; }
.section-ja {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 200; font-size: 0.62rem;
  letter-spacing: 0.18em; color: var(--ink-muted);
  display: block; margin-bottom: 1.6rem;
}
.section-desc {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 300; font-size: 0.65rem;
  line-height: 2; color: var(--ink-faint);
}
.section-arrow {
  display: block; margin-top: 2rem;
  font-size: 0.85rem; opacity: 0;
  transform: translateX(-8px);
  transition: opacity 0.4s ease, transform 0.4s ease;
  color: var(--ink-muted);
}
.section-card:hover .section-arrow { opacity: 1; transform: translateX(0); }

.reveal {
  opacity: 0; transform: translateY(22px);
  transition: opacity 0.8s cubic-bezier(0.16,1,0.3,1), transform 0.8s cubic-bezier(0.16,1,0.3,1);
}
.reveal.visible { opacity: 1; transform: translateY(0); }

footer {
  background: var(--ink);
  color: var(--paper);
  padding: 3.5rem 2.4rem;
  position: relative; z-index: 20;
}
.footer-inner {
  display: grid; grid-template-columns: 1fr 1fr 1fr;
  gap: 2rem; align-items: end;
  border-top: 0.5px solid rgba(247,246,243,0.1);
  padding-top: 2.5rem;
}
.footer-brand { font-weight: 200; font-size: 1rem; letter-spacing: 0.06em; opacity: 0.85; }
.footer-tagline {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 200; font-size: 0.6rem;
  letter-spacing: 0.22em; color: rgba(247,246,243,0.35);
  margin-top: 0.5rem;
}
.footer-nav { display: flex; flex-direction: column; gap: 0.9rem; list-style: none; }
.footer-nav a {
  font-weight: 300; font-size: 0.65rem;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: rgba(247,246,243,0.4); text-decoration: none;
  transition: color 0.3s;
}
.footer-nav a:hover { color: rgba(247,246,243,0.85); }
.footer-copy {
  font-size: 0.6rem; letter-spacing: 0.12em;
  color: rgba(247,246,243,0.2);
  text-align: right; align-self: end; line-height: 1.8;
}
.sections-bottom-border { height: 0.5px; background: var(--line); }

@media (max-width: 900px) {
  .sections-grid { grid-template-columns: 1fr 1fr; }
  .section-card { border-bottom: 0.5px solid var(--line); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-copy { text-align: left; }
}
@media (max-width: 560px) {
  .sections-grid { grid-template-columns: 1fr; }
  .section-card { border-right: none; }
  .footer-inner { grid-template-columns: 1fr; }
  .nav-links { gap: 1.2rem; }
}