/* ── Tokens ─────────────────────────────────────────────── */
:root {
  --bg:       #0c0a08;
  --fg:       #ede9e1;
  --fg-muted: #6b6560;
  --accent:   #a8936a;
  --nav-h:    72px;
  --ease:     cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --font-display: 'Shippori Mincho B1', 'Hiragino Mincho ProN', 'Yu Mincho', serif;
  --font-body:    'Inter', -apple-system, sans-serif;
}

/* ── Reset ──────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-weight: 300;
  cursor: none;
  -webkit-font-smoothing: antialiased;
}

/* 和紙テクスチャ */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9998;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 180px;
  background-repeat: repeat;
}

a { color: inherit; text-decoration: none; }
img { display: block; width: 100%; height: 100%; object-fit: cover; }

/* ── Custom cursor ──────────────────────────────────────── */
.cursor {
  position: fixed;
  top: 0; left: 0;
  width: 7px; height: 7px;
  background: var(--fg);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  transition: transform 0.15s var(--ease), opacity 0.3s;
  mix-blend-mode: difference;
  will-change: transform;
}

.cursor.expanded {
  transform: translate(-50%, -50%) scale(6);
  opacity: 0.2;
}

/* ── Nav ────────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(32px, 6vw, 80px);
  z-index: 100;
  transition: transform 0.5s var(--ease);
  backdrop-filter: blur(24px) saturate(140%);
  -webkit-backdrop-filter: blur(24px) saturate(140%);
  background: rgba(12, 10, 8, 0.65);
  border-bottom: 1px solid rgba(168, 147, 106, 0.12);
}

.nav.hidden { transform: translateY(-100%); }

.nav-logo {
  display: flex;
  align-items: center;
  height: 100%;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 0.3em;
  color: var(--accent);
}

/* height:100% + inner flex centering makes the whole nav bar the tap
   target (var(--nav-h)), not just the text glyph box */
.nav-links { display: flex; gap: 48px; height: 100%; }

.nav-links a {
  display: flex;
  align-items: center;
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg-muted);
  font-family: var(--font-body);
  transition: color 0.3s;
}

.nav-links a:hover { color: var(--fg); }

/* ── Hero ───────────────────────────────────────────────── */
.hero {
  height: 100svh;
  display: flex;
  align-items: flex-end;
  padding: 0 clamp(32px, 6vw, 80px) clamp(64px, 11vh, 130px);
  position: relative;
  overflow: hidden;
}

/* 縦書きタグライン */
.hero-tagline {
  position: absolute;
  top: calc(var(--nav-h) + 56px);
  right: clamp(32px, 6vw, 80px);
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-display);
  font-size: clamp(14px, 1.6vw, 20px);
  font-weight: 400;
  color: var(--fg-muted);
  letter-spacing: 0.46em;
  opacity: 0;
  transform: translateY(-20px);
  animation: fade-down 1.4s var(--ease-out) 0.7s forwards;
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 1;
}

/* 金の横線 */
.hero-rule {
  display: block;
  width: 56px;
  height: 1px;
  background: var(--accent);
  margin-bottom: 36px;
  opacity: 0;
  transform: scaleX(0);
  transform-origin: left;
  animation: rule-in 1s var(--ease-out) 0.4s forwards;
}

.hero-name {
  font-family: var(--font-display);
  font-size: clamp(56px, 11vw, 140px);
  font-weight: 800;
  line-height: 0.88;
  letter-spacing: -0.02em;
  opacity: 0;
  transform: translateY(52px);
  animation: fade-up 1.3s var(--ease-out) 0.2s forwards;
}

/* ── About ──────────────────────────────────────────────── */
.about {
  padding: clamp(120px, 18vh, 220px) clamp(32px, 6vw, 80px);
  border-top: 1px solid rgba(168, 147, 106, 0.1);
}

.about-content {
  max-width: 700px;
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 1s var(--ease-out), transform 1s var(--ease-out);
}

.about-content.visible {
  opacity: 1;
  transform: translateY(0);
}

.about p {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.5vw, 50px);
  font-weight: 400;
  line-height: 1.65;
  letter-spacing: 0.05em;
}

.about-sub {
  font-family: var(--font-display) !important;
  font-size: 12px !important;
  letter-spacing: 0.5em;
  color: var(--accent);
  margin-top: 52px;
}

/* ── Footer ─────────────────────────────────────────────── */
.footer {
  padding: 64px clamp(32px, 6vw, 80px) 56px;
  border-top: 1px solid rgba(237, 233, 225, 0.05);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-links { display: flex; gap: 40px; }

.footer-links a {
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg-muted);
  font-family: var(--font-body);
  transition: color 0.3s;
}

.footer-links a:hover { color: var(--accent); }

.footer-copy {
  font-family: var(--font-body);
  font-size: 10px;
  color: rgba(107, 101, 96, 0.4);
  letter-spacing: 0.1em;
}

/* ── YOHAKU Series Teaser ───────────────────────────────── */
.series-teaser {
  border-top: 1px solid rgba(168, 147, 106, 0.12);
  border-bottom: 1px solid rgba(168, 147, 106, 0.12);
}

.series-link {
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 28px clamp(32px, 6vw, 80px);
  transition: background 0.3s var(--ease);
}

.series-link:hover { background: rgba(168, 147, 106, 0.04); }

.series-label {
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.45em;
  text-transform: uppercase;
  color: var(--accent);
  white-space: nowrap;
}

.series-desc {
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--fg-muted);
  flex: 1;
}

.series-arrow {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--fg-muted);
  transition: transform 0.3s var(--ease-out), color 0.3s;
}

.series-link:hover .series-arrow {
  transform: translateX(6px);
  color: var(--accent);
}

/* ── Contact CTA ────────────────────────────────────────── */









/* ── Keyframes ──────────────────────────────────────────── */
@keyframes fade-up {
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fade-down {
  to { opacity: 1; transform: translateY(0); }
}

@keyframes rule-in {
  to { opacity: 1; transform: scaleX(1); }
}

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 600px) {
  .nav-links { gap: 24px; }
  .nav-links a { font-size: 13px; letter-spacing: 0.14em; }
  .hero-tagline { font-size: 12px; right: 20px; }

  .about { padding: clamp(88px, 14vh, 160px) clamp(24px, 6vw, 80px); }

  .series-link { padding: 24px clamp(24px, 6vw, 80px); gap: 20px; }
  .series-desc { font-size: 12px; }

  .footer { padding: 48px clamp(24px, 6vw, 80px) 40px; }
  /* flex-wrap prevents the 4-link row (X / note / Dopamine Lab TV / Essays)
     from overflowing the viewport at narrow widths (320px) */
  .footer-links { flex-wrap: wrap; gap: 14px 24px; }
  .footer-links a {
    font-size: 12px;
    letter-spacing: 0.14em;
    padding: 15px 2px;
    margin: -15px -2px;
  }
  .footer-copy { font-size: 11px; }

  body { cursor: auto; }
  .cursor { display: none; }
}

@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; }
}