/* ── KOTOBART main.css ── */

:root {
  --ink:        #1a1814;
  --ink-light:  #3d3a35;
  --ink-faint:  #7a7570;
  --washi:      #f5f2ec;
  --washi-dark: #ede9e0;
  --gold:       #9a7c3f;
  --gold-light: #c4a96a;
  --line:       rgba(26,24,20,0.12);
  --line-strong:rgba(26,24,20,0.25);
  --max-w:      1200px;
  --pad:        clamp(1.5rem, 5vw, 4rem);
}

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

body {
  font-family: 'Noto Sans JP', sans-serif;
  background: var(--washi);
  color: var(--ink);
  font-weight: 300;
  line-height: 1.8;
  overflow-x: hidden;
}

/* ── NAV ── */
.kb-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem var(--pad);
  background: rgba(245,242,236,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.kb-nav-logo {
  font-family: 'Noto Serif JP', serif;
  font-weight: 400;
  font-size: 0.95rem;
  letter-spacing: 0.15em;
  color: var(--ink);
  text-decoration: none;
}
.kb-nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}
.kb-nav-links a {
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--ink-faint);
  text-decoration: none;
  transition: color 0.3s;
}
.kb-nav-links a:hover { color: var(--gold); }

/* ── HERO ── */
.kb-hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 8rem var(--pad) 5rem;
  position: relative;
  overflow: hidden;
}
.kb-hero-bg {
  position: absolute;
  top: 50%; right: -2rem;
  transform: translateY(-50%);
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(8rem, 18vw, 18rem);
  font-weight: 300;
  color: rgba(26,24,20,0.04);
  pointer-events: none;
  line-height: 1;
  white-space: nowrap;
  letter-spacing: -0.02em;
}
.kb-hero-eyebrow {
  font-size: 0.65rem;
  letter-spacing: 0.28em;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 2rem;
}
.kb-hero-title {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(2.2rem, 5vw, 4.5rem);
  font-weight: 300;
  line-height: 1.3;
  letter-spacing: 0.05em;
  max-width: 700px;
  margin-bottom: 1.2rem;
}
.kb-hero-title em { font-style: normal; color: var(--gold); }
.kb-hero-subtitle {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  font-weight: 300;
  font-style: italic;
  color: var(--ink-light);
  letter-spacing: 0.03em;
}
.kb-hero-line {
  width: 60px; height: 1px;
  background: var(--gold);
  margin: 2.5rem 0;
}
.kb-hero-tagline {
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  color: var(--ink-faint);
  max-width: 500px;
  line-height: 2.2;
}
.kb-hero-cta {
  margin-top: 3rem;
  display: flex;
  gap: 1.8rem;
  align-items: center;
  flex-wrap: wrap;
}

/* ── BUTTONS ── */
.kb-btn-primary {
  display: inline-block;
  padding: 0.9rem 2.5rem;
  background: var(--ink);
  color: var(--washi);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-decoration: none;
  transition: background 0.3s;
}
.kb-btn-primary:hover { background: var(--gold); color: var(--washi); }
.kb-btn-secondary {
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  color: var(--ink-faint);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
  transition: color 0.3s;
}
.kb-btn-secondary:hover { color: var(--gold); }

/* ── SECTION COMMONS ── */
.kb-section {
  padding: 7rem var(--pad);
}
.kb-section--dark {
  background: var(--washi-dark);
}
.kb-section--ink {
  background: var(--ink);
  color: var(--washi);
}
.kb-eyebrow {
  font-size: 0.62rem;
  letter-spacing: 0.32em;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 2.8rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.kb-eyebrow::after {
  content: '';
  display: block;
  width: 40px; height: 1px;
  background: var(--gold);
}
.kb-eyebrow--light { color: var(--gold-light); }
.kb-eyebrow--light::after { background: var(--gold-light); }
.kb-section-title {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(1.6rem, 3vw, 2.5rem);
  font-weight: 300;
  letter-spacing: 0.05em;
  line-height: 1.4;
  margin-bottom: 1.8rem;
  max-width: 600px;
}
.kb-section-body {
  font-size: 0.88rem;
  line-height: 2.1;
  color: var(--ink-light);
  max-width: 560px;
}
.kb-section-body--light { color: rgba(245,242,236,0.65); }
.kb-divider {
  height: 1px;
  background: var(--line);
  margin: 0 var(--pad);
}

/* ── ABOUT ── */
.kb-about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}
.kb-about-visual {
  position: relative;
}
.kb-about-rect {
  width: 100%;
  padding-top: 115%;
  background: var(--ink);
  position: relative;
  overflow: hidden;
}
.kb-about-rect-inner {
  position: absolute;
  inset: 2.5rem;
  border: 1px solid rgba(245,242,236,0.15);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 2rem;
}
.kb-about-kanji {
  font-family: 'Noto Serif JP', serif;
  font-size: 5rem;
  font-weight: 300;
  color: rgba(245,242,236,0.06);
  position: absolute;
  top: 1.5rem; right: 2rem;
  line-height: 1;
}
.kb-about-name {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.25rem;
  font-weight: 300;
  color: var(--washi);
  letter-spacing: 0.1em;
  margin-bottom: 0.3rem;
}
.kb-about-tag {
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  color: var(--gold-light);
}

/* ── SERVICES ── */
.kb-services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 4rem;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.kb-service-card {
  padding: 2.8rem 2.2rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  transition: background 0.3s;
  position: relative;
}
.kb-service-card:hover { background: var(--washi-dark); }
.kb-service-num {
  font-family: 'Cormorant Garamond', serif;
  font-size: 3.5rem;
  font-weight: 300;
  color: rgba(26,24,20,0.06);
  line-height: 1;
  margin-bottom: 1.2rem;
}
.kb-service-label {
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  color: var(--gold);
  display: block;
  margin-bottom: 0.8rem;
}
.kb-service-title {
  font-family: 'Noto Serif JP', serif;
  font-size: 1.05rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  line-height: 1.5;
  margin-bottom: 1rem;
}
.kb-service-desc {
  font-size: 0.78rem;
  line-height: 1.95;
  color: var(--ink-faint);
}

/* ── PROCESS ── */
.kb-process-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 5rem;
  border-top: 1px solid rgba(245,242,236,0.12);
}
.kb-process-step {
  padding: 3.5rem 2.5rem 3.5rem 0;
  border-right: 1px solid rgba(245,242,236,0.08);
  position: relative;
}
.kb-process-step:last-child { border-right: none; padding-right: 0; }
.kb-process-step:not(:first-child) { padding-left: 2.5rem; }
.kb-process-num {
  font-family: 'Cormorant Garamond', serif;
  font-size: 4rem;
  font-weight: 300;
  color: rgba(245,242,236,0.07);
  line-height: 1;
  margin-bottom: 2rem;
}
.kb-process-label {
  font-size: 0.58rem;
  letter-spacing: 0.3em;
  color: var(--gold-light);
  display: block;
  margin-bottom: 0.7rem;
}
.kb-process-title {
  font-family: 'Noto Serif JP', serif;
  font-size: 1.1rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  color: var(--washi);
  line-height: 1.5;
  margin-bottom: 0.8rem;
}
.kb-process-en {
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.92rem;
  font-style: italic;
  font-weight: 300;
  color: rgba(245,242,236,0.35);
  margin-bottom: 1.2rem;
}
.kb-process-desc {
  font-size: 0.77rem;
  line-height: 2;
  color: rgba(245,242,236,0.5);
}
.kb-process-arrow {
  position: absolute;
  top: 50%; right: -0.9rem;
  transform: translateY(-50%);
  font-size: 0.8rem;
  color: var(--gold);
  z-index: 1;
}

/* ── BLOG POSTS ── */
.kb-blog-section {
  padding: 7rem var(--pad);
  background: var(--washi-dark);
}
.kb-blog-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 4rem;
  flex-wrap: wrap;
  gap: 1rem;
}
.kb-blog-all {
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--ink-faint);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
  transition: color 0.3s;
}
.kb-blog-all:hover { color: var(--gold); }
.kb-posts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
}
.kb-post-card { display: flex; flex-direction: column; gap: 0; }
.kb-post-thumb {
  display: block;
  overflow: hidden;
  aspect-ratio: 4/3;
  margin-bottom: 1.5rem;
}
.kb-post-thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.kb-post-card:hover .kb-post-thumb img { transform: scale(1.03); }
.kb-post-meta {
  display: flex;
  gap: 1rem;
  align-items: center;
  margin-bottom: 0.7rem;
}
.kb-post-cat {
  font-size: 0.58rem;
  letter-spacing: 0.2em;
  color: var(--gold);
  text-transform: uppercase;
}
.kb-post-date {
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  font-family: 'Cormorant Garamond', serif;
}
.kb-post-title {
  font-family: 'Noto Serif JP', serif;
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.03em;
  line-height: 1.6;
  margin-bottom: 0.8rem;
}
.kb-post-title a {
  color: var(--ink);
  text-decoration: none;
  transition: color 0.3s;
}
.kb-post-title a:hover { color: var(--gold); }
.kb-post-excerpt {
  font-size: 0.78rem;
  line-height: 1.9;
  color: var(--ink-faint);
  margin-bottom: 1.2rem;
  flex: 1;
}
.kb-post-link {
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  color: var(--ink-faint);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
  align-self: flex-start;
  transition: color 0.3s;
}
.kb-post-link:hover { color: var(--gold); }

/* ── CONTACT ── */
.kb-contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: start;
}
.kb-contact-detail { margin-bottom: 2.2rem; }
.kb-contact-label {
  font-size: 0.58rem;
  letter-spacing: 0.28em;
  color: var(--gold);
  display: block;
  margin-bottom: 0.4rem;
}
.kb-contact-value {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.05rem;
  font-weight: 300;
  color: var(--ink-light);
  letter-spacing: 0.05em;
}
.kb-form { display: flex; flex-direction: column; gap: 1.5rem; }
.kb-form-group { display: flex; flex-direction: column; gap: 0.4rem; }
.kb-form-group label {
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  color: var(--ink-faint);
}
.kb-form-group input,
.kb-form-group textarea,
.kb-form-group select {
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--line-strong);
  padding: 0.6rem 0;
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 0.85rem;
  font-weight: 300;
  color: var(--ink);
  outline: none;
  width: 100%;
  transition: border-color 0.3s;
  border-radius: 0;
  -webkit-appearance: none;
}
.kb-form-group input:focus,
.kb-form-group textarea:focus,
.kb-form-group select:focus { border-color: var(--gold); }
.kb-form-group textarea { resize: none; height: 100px; line-height: 1.8; }
.kb-form-submit {
  align-self: flex-start;
  margin-top: 0.8rem;
  padding: 0.9rem 3rem;
  background: var(--ink);
  color: var(--washi);
  border: none;
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  cursor: pointer;
  transition: background 0.3s;
  border-radius: 0;
}
.kb-form-submit:hover { background: var(--gold); }

/* ── FOOTER ── */
.kb-footer {
  padding: 2.5rem var(--pad);
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  background: var(--washi);
}
.kb-footer-logo {
  font-family: 'Noto Serif JP', serif;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
}
.kb-footer-tagline {
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.85rem;
  font-style: italic;
  color: var(--ink-faint);
}
.kb-footer-copy {
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
}

/* ── SINGLE POST ── */
.kb-single {
  max-width: 720px;
  margin: 0 auto;
  padding: 8rem var(--pad) 6rem;
}
.kb-single-meta {
  display: flex; gap: 1.5rem; align-items: center;
  margin-bottom: 2rem;
}
.kb-single-title {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(1.6rem, 3.5vw, 2.8rem);
  font-weight: 300;
  line-height: 1.4;
  letter-spacing: 0.04em;
  margin-bottom: 3rem;
}
.kb-single-thumb {
  width: 100%;
  margin-bottom: 3rem;
}
.kb-single-thumb img { width: 100%; height: auto; }
.kb-single-content {
  font-size: 0.92rem;
  line-height: 2.1;
  color: var(--ink-light);
}
.kb-single-content h2 {
  font-family: 'Noto Serif JP', serif;
  font-size: 1.3rem;
  font-weight: 400;
  margin: 2.5rem 0 1rem;
  letter-spacing: 0.04em;
}
.kb-single-content p { margin-bottom: 1.4rem; }
.kb-single-content a { color: var(--gold); }

/* ── ANIMATIONS ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
.kb-fade-up { animation: fadeUp 0.9s ease forwards; opacity: 0; }
.kb-delay-1 { animation-delay: 0.15s; }
.kb-delay-2 { animation-delay: 0.3s; }
.kb-delay-3 { animation-delay: 0.45s; }
.kb-delay-4 { animation-delay: 0.6s; }

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .kb-nav-links { display: none; }
  .kb-about-grid,
  .kb-contact-grid { grid-template-columns: 1fr; gap: 3rem; }
  .kb-services-grid { grid-template-columns: 1fr; }
  .kb-process-steps { grid-template-columns: 1fr; }
  .kb-process-step {
    border-right: none;
    border-bottom: 1px solid rgba(245,242,236,0.08);
    padding: 2.5rem 0;
  }
  .kb-process-step:not(:first-child) { padding-left: 0; }
  .kb-process-arrow { display: none; }
  .kb-posts-grid { grid-template-columns: 1fr; }
  .kb-blog-header { flex-direction: column; align-items: flex-start; }
  .kb-footer { flex-direction: column; text-align: center; }
}
@media (min-width: 600px) and (max-width: 900px) {
  .kb-posts-grid { grid-template-columns: repeat(2, 1fr); }
  .kb-services-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ── LOGO ── */
.kb-nav-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}
.kb-nav-logo-img {
  height: 72px;
  width: auto;
  display: block;
  /* ロゴの白背景を和紙色に馴染ませる */
  mix-blend-mode: multiply;
  opacity: 0.92;
  transition: opacity 0.3s;
}
.kb-nav-logo:hover .kb-nav-logo-img {
  opacity: 1;
}

/* ロゴ画像があるときフォールバックテキストを隠す */
.kb-nav-logo-img[src] { display: block; }
.kb-nav-logo-fallback { display: none; }
.kb-nav-logo-img:not([src]),
.kb-nav-logo-img[src=""] {
  display: none;
}
.kb-nav-logo-img:not([src]) ~ .kb-nav-logo-fallback,
.kb-nav-logo-img[src=""] ~ .kb-nav-logo-fallback {
  display: block;
  font-family: 'Noto Serif JP', serif;
  font-weight: 400;
  font-size: 0.95rem;
  letter-spacing: 0.15em;
  color: var(--ink);
}