/* =============================================================
   LUMEN — 光と影の理髪 / 表参道のハイエンド美容室
   Shared stylesheet (loaded on every page)
   ============================================================= */

:root {
  --ink:        #0B0A08;
  --ink-2:      #16130E;
  --ink-3:      #2A2520;
  --paper:      #F5F0E3;
  --paper-2:    #E5DEC9;
  --paper-3:    #C6BAA0;
  --gold:       #C9A55B;
  --gold-deep:  #9B7C3E;
  --gold-soft:  rgba(201, 165, 91, 0.18);
  --rule:       rgba(245, 240, 227, 0.14);
  --rule-2:     rgba(245, 240, 227, 0.28);

  --ff-display: "EB Garamond", "Noto Serif JP", Georgia, serif;
  --ff-sans:    "Inter", "Noto Sans JP", system-ui, sans-serif;
  --ff-serif-jp:"Noto Serif JP", serif;
  --ff-mono:    "JetBrains Mono", ui-monospace, monospace;

  --ease:       cubic-bezier(0.22, 1, 0.36, 1);
  --ease-expo:  cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out:   cubic-bezier(0.33, 1, 0.68, 1);

  --pad-x:      clamp(1.25rem, 4vw, 3rem);
  --container:  1320px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
*::selection { background: var(--gold); color: var(--ink); }

html {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--ff-sans);
  font-feature-settings: "palt" 1, "kern" 1;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  overflow-x: clip;
}
body {
  background: var(--ink);
  color: var(--paper);
  min-height: 100svh;
  font-size: 15.5px;
  line-height: 1.85;
  letter-spacing: 0.015em;
  overflow-x: clip;
}
body.is-loading { overflow: hidden; height: 100svh; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; background: transparent; border: 0; color: inherit; cursor: pointer; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 var(--pad-x); }

/* =========================================
   SHARED HEADER
   ========================================= */
.site-hdr {
  position: fixed; inset: 0 0 auto 0;
  z-index: 100;
  padding: env(safe-area-inset-top, 0) 0 0;
  background: rgba(11, 10, 8, 0.72);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--rule);
  transition: background 0.4s var(--ease), transform 0.4s var(--ease-expo);
}
.site-hdr.is-hidden-top { transform: translateY(-100%); }
.site-hdr__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 1rem var(--pad-x);
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  align-items: center;
  gap: 1.5rem;
}
.site-hdr__brand {
  font-family: var(--ff-display);
  font-style: italic;
  font-weight: 500;
  font-size: 22px;
  letter-spacing: 0.04em;
  color: var(--paper);
  line-height: 1;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--paper);
  transition: opacity 0.25s;
}
.site-hdr__brand sup {
  font-family: var(--ff-mono);
  font-style: normal;
  font-weight: 500;
  font-size: 9px;
  letter-spacing: 0.2em;
  color: var(--gold);
  margin-left: 0.4em;
  vertical-align: 0.4em;
}
.site-hdr__brand:hover { opacity: 0.72; }
.site-hdr__nav {
  display: flex;
  justify-self: center;
  gap: 1.75rem;
}
.site-hdr__nav a {
  position: relative;
  font-family: var(--ff-sans);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--paper-3);
  padding: 0.45rem 0;
  transition: color 0.25s;
}
.site-hdr__nav a i {
  font-family: var(--ff-mono);
  font-style: normal;
  font-size: 9px;
  color: var(--gold);
  margin-right: 0.4em;
  letter-spacing: 0.1em;
}
.site-hdr__nav a::after {
  content: "";
  position: absolute; left: 0; right: 0; bottom: 0;
  height: 1px;
  background: var(--paper);
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform 0.35s var(--ease);
}
.site-hdr__nav a:hover { color: var(--paper); }
.site-hdr__nav a:hover::after {
  transform: scaleX(1);
  transform-origin: left center;
}
body[data-page] .site-hdr__nav a[data-match] {
  /* active state logic: JS adds is-active when data-match === data-page */
}
.site-hdr__nav a.is-active {
  color: var(--paper);
}
.site-hdr__nav a.is-active::after {
  transform: scaleX(1);
  background: var(--gold);
}

.site-hdr__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.75rem 1.3rem;
  border: 1px solid var(--paper);
  border-radius: 999px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--ff-sans);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transition: background 0.3s, color 0.3s, transform 0.3s var(--ease);
  will-change: transform;
}
.site-hdr__cta:hover {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--ink);
  transform: translateY(-2px);
}
.site-hdr__cta-dot {
  width: 6px; height: 6px;
  background: var(--ink);
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(11, 10, 8, 0.18);
}
.site-hdr__cta:hover .site-hdr__cta-dot {
  background: var(--ink);
  box-shadow: 0 0 0 3px rgba(11, 10, 8, 0.28);
}
.site-hdr__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 10px;
  align-items: center;
}
.site-hdr__burger span {
  width: 22px; height: 1.5px;
  background: var(--paper);
  border-radius: 999px;
  transition: transform 0.3s, opacity 0.3s;
}

/* =========================================
   SHARED FOOTER
   ========================================= */
.site-ft {
  position: relative;
  margin-top: 0;
  background: var(--ink);
  color: var(--paper-3);
  padding-bottom: 2rem;
  overflow: hidden;
}
.site-ft__mega {
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 2rem 0;
  overflow: hidden;
  white-space: nowrap;
}
.site-ft__mega-track {
  display: inline-flex;
  gap: 3rem;
  font-family: var(--ff-display);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(3.5rem, 11vw, 10rem);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--paper);
  will-change: transform;
}
.site-ft__mega-dot {
  font-style: normal;
  font-family: var(--ff-sans);
  font-weight: 400;
  color: var(--gold);
  font-size: 0.55em;
  align-self: center;
}
.site-ft__inner {
  display: grid;
  grid-template-columns: 1.1fr 2fr;
  gap: 3.5rem;
  padding: clamp(3rem, 6vw, 5rem) var(--pad-x) 2.5rem;
  max-width: var(--container);
  margin: 0 auto;
  border-bottom: 1px solid var(--rule);
}
@media (max-width: 800px) {
  .site-ft__inner { grid-template-columns: 1fr; gap: 2rem; }
}
.site-ft__brand {
  display: inline-block;
  font-family: var(--ff-display);
  font-style: italic;
  font-weight: 500;
  font-size: 28px;
  color: var(--paper);
  letter-spacing: 0.04em;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--paper);
  line-height: 1;
}
.site-ft__tagline {
  margin-top: 1.3rem;
  font-size: 13px;
  line-height: 1.95;
  color: var(--paper-3);
  font-family: var(--ff-serif-jp);
  max-width: 28ch;
}
.site-ft__cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 2.5rem 2rem;
}
.site-ft__col h5 {
  font-family: var(--ff-sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.3em;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 1.2rem;
}
.site-ft__col a, .site-ft__col p {
  display: block;
  font-family: var(--ff-sans);
  font-size: 13px;
  color: var(--paper-3);
  line-height: 1.85;
  margin-bottom: 0.45rem;
  transition: color 0.2s;
}
.site-ft__col a:hover { color: var(--paper); }
.site-ft__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--container);
  margin: 0 auto;
  padding: 2rem var(--pad-x) 0;
  font-family: var(--ff-mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--paper-3);
}
@media (max-width: 640px) {
  .site-ft__bottom { flex-direction: column; gap: 0.6rem; text-align: center; }
}

/* =========================================
   BUTTONS
   ========================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 1rem 1.8rem;
  border-radius: 999px;
  font-family: var(--ff-sans);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  line-height: 1;
  border: 1.5px solid transparent;
  transition: transform 0.3s var(--ease), background 0.3s, color 0.3s, border-color 0.3s;
  will-change: transform;
  cursor: pointer;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn--primary {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--paper);
}
.btn--primary:hover { background: var(--gold); border-color: var(--gold); color: var(--ink); }
.btn--ghost {
  background: transparent;
  border-color: var(--rule-2);
  color: var(--paper);
}
.btn--ghost:hover { border-color: var(--paper); }
.btn--gold {
  background: var(--gold);
  color: var(--ink);
  border-color: var(--gold);
}
.btn--gold:hover { background: var(--gold-deep); border-color: var(--gold-deep); }

/* =========================================
   CUSTOM CURSOR (desktop only)
   ========================================= */
.cursor {
  position: fixed;
  top: 0; left: 0;
  pointer-events: none;
  z-index: 9998;
  mix-blend-mode: difference;
}
.cursor__dot {
  position: absolute;
  width: 6px; height: 6px;
  background: var(--paper);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.25s, height 0.25s;
}
.cursor__ring {
  position: absolute;
  width: 40px; height: 40px;
  border: 1px solid var(--paper);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.4s var(--ease), height 0.4s var(--ease), background 0.3s, border-color 0.3s;
}
.cursor.is-link .cursor__ring { width: 68px; height: 68px; }
.cursor.is-cta .cursor__ring {
  width: 90px; height: 90px;
  background: var(--gold);
  border-color: var(--gold);
}
.cursor.is-cta::after {
  content: "→";
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  color: var(--ink);
  font: 700 16px/1 var(--ff-sans);
}
.cursor.is-cta .cursor__dot { opacity: 0; }
@media (hover: none) {
  .cursor { display: none; }
}

/* =========================================
   SHARED LOADER (black page with gold split reveal)
   ========================================= */
.pre {
  position: fixed; inset: 0;
  z-index: 9990;
  background: var(--ink);
  display: grid;
  place-items: center;
  transition: opacity 0.6s var(--ease);
}
.pre__wrap {
  display: grid;
  place-items: center;
  gap: 1.1rem;
  text-align: center;
}
.pre__mark {
  width: 52px; height: 52px;
  border: 1px solid var(--gold);
  border-radius: 50%;
  position: relative;
  animation: preSpin 1.4s linear infinite;
}
.pre__mark::before {
  content: "";
  position: absolute;
  top: -4px; left: 50%;
  width: 6px; height: 6px;
  background: var(--gold);
  border-radius: 50%;
  transform: translateX(-50%);
}
@keyframes preSpin { to { transform: rotate(360deg); } }
.pre__text {
  font-family: var(--ff-mono);
  font-size: 10.5px;
  letter-spacing: 0.3em;
  color: var(--paper-3);
  text-transform: uppercase;
}
.pre.is-gone {
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
}

/* =========================================
   UTILITY — section wrapper, eyebrow, rule
   ========================================= */
.sec {
  padding: clamp(4.5rem, 10vh, 9rem) 0;
  position: relative;
}
.sec--tight { padding: clamp(3rem, 6vh, 5rem) 0; }
.sec--dark { background: var(--ink-2); }
.sec--paper { background: var(--paper); color: var(--ink); }
.sec--paper .paper-ink { color: var(--ink); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--ff-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--gold);
}
.eyebrow::before {
  content: "";
  width: 24px; height: 1px;
  background: currentColor;
}
.sec--paper .eyebrow { color: var(--gold-deep); }

.h1 {
  font-family: var(--ff-display);
  font-weight: 500;
  font-size: clamp(2.9rem, 8.4vw, 7.4rem);
  line-height: 0.95;
  letter-spacing: -0.02em;
}
.h1 em {
  font-style: italic;
  font-weight: 400;
  color: var(--gold);
}
.h2 {
  font-family: var(--ff-display);
  font-weight: 500;
  font-size: clamp(2.1rem, 5.25vw, 4.2rem);
  line-height: 1.05;
  letter-spacing: -0.015em;
}
.h2 em {
  font-style: italic;
  color: var(--gold);
  font-weight: 400;
}
.h3 {
  font-family: var(--ff-sans);
  font-weight: 500;
  font-size: clamp(1.1rem, 1.6vw, 1.3rem);
  letter-spacing: 0.04em;
  line-height: 1.4;
}

/* =========================================
   PAGE-OPEN ANIMATION HOOKS
   ========================================= */
[data-anim] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}
[data-anim].is-in {
  opacity: 1;
  transform: translateY(0);
}

[data-split-word] {
  overflow: hidden;
  display: inline-block;
  vertical-align: top;
}
[data-split-word] > span {
  display: inline-block;
  transform: translateY(110%);
  transition: transform 1s var(--ease-expo);
}
[data-split-word].is-in > span {
  transform: translateY(0);
}

/* =========================================
   GRAIN OVERLAY
   ========================================= */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9997;
  opacity: 0.04;
  mix-blend-mode: screen;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.82' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  background-size: 240px 240px;
  animation: grainShift 7s steps(6) infinite;
}
@keyframes grainShift {
  0%,100% { transform: translate(0,0); }
  25% { transform: translate(-2%,-1%); }
  50% { transform: translate(2%,1%); }
  75% { transform: translate(-1%,2%); }
}

/* =========================================
   MOBILE NAV (off-canvas)
   ========================================= */
@media (max-width: 900px) {
  .site-hdr__nav { display: none; }
  .site-hdr__inner { grid-template-columns: 1fr auto auto; }
  .site-hdr__burger { display: inline-flex; }
  .site-hdr__cta { padding: 0.65rem 1.1rem; font-size: 11px; }
}

.mnav {
  position: fixed;
  inset: 0;
  z-index: 99;
  background: var(--ink);
  display: grid;
  place-items: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.45s var(--ease);
}
.mnav.is-open {
  opacity: 1;
  pointer-events: auto;
}
.mnav ol {
  list-style: none;
  display: grid;
  gap: 1.6rem;
  text-align: center;
}
.mnav a {
  font-family: var(--ff-display);
  font-style: italic;
  font-size: 2.2rem;
  color: var(--paper);
  letter-spacing: 0.02em;
}
.mnav a i {
  font-family: var(--ff-mono);
  font-style: normal;
  color: var(--gold);
  font-size: 11px;
  margin-right: 0.6em;
  letter-spacing: 0.1em;
  vertical-align: 0.35em;
}

.sample-tag {
  position: fixed;
  bottom: 1rem; left: 1rem;
  z-index: 200;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--gold);
  color: var(--gold);
  font-family: var(--ff-mono);
  font-size: 9.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  background: rgba(11, 10, 8, 0.6);
  backdrop-filter: blur(6px);
}