/* =========================================================================
   West Bridge Farm — Design System
   墨色モノトーン × 明朝 / Cormorant Garamond
   Built on the visual DNA of the company meishi.
   ========================================================================= */

:root {
  /* —— Ink palette (from the meishi) —— */
  --ink:        #161616;  /* primary headlines */
  --ink-soft:   #26241f;  /* body dark */
  --stone:      #5f5c56;  /* secondary text */
  --mist:       #8d8a82;  /* captions, labels */
  --mist-soft:  #b4afa5;  /* faint meta */

  --paper:      #ffffff;
  --paper-warm: #f7f4ee;  /* alternating section ground */
  --paper-deep: #131210;  /* dark feature section (warm sumi) */
  --deep-fg:    #efe9dd;  /* text on deep */
  --deep-mist:  #9c958a;

  --line:       #e4e0d6;  /* hairline */
  --line-soft:  #efece4;
  --line-deep:  rgba(239,233,221,0.18);

  /* faintest whisper of warmth — used only on the thinnest rules / marks */
  --accent:     #6f6a5e;

  /* —— Type —— */
  --font-jp:    'Noto Serif JP', serif;
  --font-en:    'Cormorant Garamond', 'Noto Serif JP', serif;
  --font-meta:  'Cormorant Garamond', serif;

  --fs-hero:    clamp(3.4rem, 9vw, 8rem);
  --fs-display: clamp(2.2rem, 5vw, 4.2rem);
  --fs-h2:      clamp(1.7rem, 3.2vw, 2.7rem);
  --fs-h3:      clamp(1.25rem, 2vw, 1.6rem);
  --fs-lead:    clamp(1.05rem, 1.5vw, 1.3rem);
  --fs-body:    clamp(0.98rem, 1.1vw, 1.05rem);
  --fs-small:   0.86rem;
  --fs-eyebrow: 0.72rem;

  /* —— Layout —— */
  --content:    1180px;
  --measure:    640px;
  --gutter:     clamp(22px, 5vw, 72px);
  --section-py: clamp(84px, 13vh, 168px);

  /* —— Motion —— */
  --ease:       cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur:        0.7s;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-jp);
  font-weight: 400;
  color: var(--ink-soft);
  background: var(--paper);
  line-height: 1.85;
  font-feature-settings: "palt" 1;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
html { overflow-x: hidden; }

img, svg, image-slot { display: block; max-width: 100%; }

/* —— Language toggling —— */
html[lang="ja"] .en { display: none; }
html[lang="en"] .ja { display: none; }
html[lang="en"] body { letter-spacing: 0.01em; }

/* =========================================================================
   Type primitives
   ========================================================================= */
.eyebrow {
  font-family: var(--font-meta);
  font-size: var(--fs-eyebrow);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.42em;
  color: var(--mist);
  display: inline-flex;
  align-items: center;
  gap: 0.9em;
}
.eyebrow::before {
  content: "";
  width: 30px;
  height: 1px;
  background: var(--mist-soft);
}
.eyebrow.center { justify-content: center; }
.eyebrow.center::after {
  content: "";
  width: 30px;
  height: 1px;
  background: var(--mist-soft);
}

.display-en {
  font-family: var(--font-en);
  font-weight: 500;
  font-style: italic;
  line-height: 1.04;
  letter-spacing: 0.005em;
  color: var(--ink);
}

h1, h2, h3 { font-weight: 500; color: var(--ink); line-height: 1.4; }

.section-title {
  font-size: var(--fs-h2);
  font-weight: 500;
  letter-spacing: 0.08em;
  line-height: 1.5;
}

/* —— Emphasised pull-phrase inside body copy —— */
.emph {
  display: block;
  margin: 0.9em 0;
  padding-left: 0.9em;
  border-left: 2px solid var(--ink);
  font-family: var(--font-jp);
  font-weight: 600;
  font-style: normal;
  font-size: 1.18em;
  letter-spacing: 0.04em;
  line-height: 1.6;
  color: var(--ink);
}
.lead .en .emph,
.lead .ja .emph { font-size: 1.12em; }
.en .emph { font-family: var(--font-en); font-style: italic; }
.section-title .en {
  font-family: var(--font-en);
  font-style: italic;
  letter-spacing: 0.01em;
}

.lead {
  font-size: var(--fs-lead);
  color: var(--stone);
  line-height: 2.1;
  font-weight: 400;
}

p.body { font-size: var(--fs-body); color: var(--stone); line-height: 2.05; }

.measure { max-width: var(--measure); }

/* =========================================================================
   Layout helpers
   ========================================================================= */
.wrap { width: 100%; max-width: var(--content); margin-inline: auto; padding-inline: var(--gutter); }

section.block { padding-block: var(--section-py); position: relative; }
.block.warm { background: var(--paper-warm); }
.block.deep { background: var(--paper-deep); color: var(--deep-fg); }
.block.deep .section-title,
.block.deep .display-en { color: var(--deep-fg); }
.block.deep .lead,
.block.deep p.body { color: var(--deep-mist); }
.block.deep .eyebrow { color: var(--deep-mist); }
.block.deep .eyebrow::before,
.block.deep .eyebrow.center::after { background: rgba(156,149,138,0.5); }

/* a thin index marker for sections */
.sec-index {
  font-family: var(--font-meta);
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  color: var(--mist-soft);
}

/* =========================================================================
   Scroll reveal
   ========================================================================= */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 1s var(--ease), transform 1s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: 0.08s; }
.reveal.d2 { transition-delay: 0.16s; }
.reveal.d3 { transition-delay: 0.24s; }
.reveal.d4 { transition-delay: 0.32s; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

@media print {
  .reveal { opacity: 1 !important; transform: none !important; }
}

/* =========================================================================
   Image slots
   ========================================================================= */
image-slot {
  --slot-bg: #ece8df;
  background: var(--slot-bg);
  width: 100%;
  height: auto;
}
.block.deep image-slot { --slot-bg: #1d1b17; }

/* =========================================================================
   Buttons / links
   ========================================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.8em;
  font-family: var(--font-jp);
  font-size: 0.92rem;
  letter-spacing: 0.14em;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--ink);
  padding: 1em 2.2em;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.btn:hover { background: var(--ink); color: var(--paper); }
.btn.invert { color: var(--deep-fg); border-color: rgba(239,233,221,0.5); }
.btn.invert:hover { background: var(--deep-fg); color: var(--paper-deep); border-color: var(--deep-fg); }

.link-arrow {
  font-family: var(--font-meta);
  font-size: 0.95rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: gap var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.link-arrow:hover { gap: 1.1em; border-color: var(--ink); }
.block.deep .link-arrow { color: var(--deep-fg); }
.block.deep .link-arrow:hover { border-color: var(--deep-fg); }