/* ─────────────────────────────────────────
   KAIZEN BULL — Main Stylesheet
   Brand tokens, reset, layout, responsive
───────────────────────────────────────── */

:root {
  --sumi:       #1E1A14;
  --chestnut:   #7A5C3A;
  --kincha:     #C9A96E;
  --washi:      #F5F0E6;
  --seki:       #6B6B6B;
  --kiri:       #E8E4DE;
  --white:      #ffffff;

  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body:    'DM Sans', system-ui, sans-serif;

  --max-width: 1100px;
  --section-pad: 96px 24px;
  --radius: 6px;
  --transition: 0.2s ease;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-body); background: var(--washi); color: var(--sumi); font-size: 16px; line-height: 1.7; }
img  { display: block; max-width: 100%; }
a    { color: inherit; text-decoration: none; }
ul   { list-style: none; }

/* ── Typography ── */
h1, h2, h3 { font-family: var(--font-display); line-height: 1.15; }
h1 { font-size: clamp(40px, 6vw, 72px); }
h2 { font-size: clamp(28px, 4vw, 44px); }
h3 { font-size: 20px; }

.section-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--chestnut);
  margin-bottom: 12px;
}

.divider {
  width: 40px;
  height: 2px;
  background: var(--kincha);
  margin: 16px 0 36px;
}

/* ── Container ── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Buttons ── */
.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 14px 32px;
  border-radius: 2px;
  border: none;
  cursor: pointer;
  transition: opacity var(--transition), transform var(--transition);
}
.btn:hover { opacity: 0.88; transform: translateY(-1px); }
.btn-primary { background: var(--kincha); color: var(--sumi); }
.btn-outline  { background: transparent; color: var(--washi); border: 1.5px solid var(--kincha); }
.btn-outline:hover { background: var(--kincha); color: var(--sumi); }


/* ══════════════════════════════
   NAV
══════════════════════════════ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--washi);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.nav.scrolled {
  border-color: var(--kiri);
  box-shadow: 0 2px 12px rgba(30,26,20,0.07);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  max-width: var(--max-width);
  margin: 0 auto;
}
.nav-logo img { height: 135px; width: auto; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}
.nav-links a {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--seki);
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--sumi); }
.nav-links .btn { margin-left: 8px; }

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}
.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--sumi);
  transition: all 0.25s ease;
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-mobile {
  display: none;
  flex-direction: column;
  gap: 0;
  background: var(--washi);
  border-top: 1px solid var(--kiri);
  padding: 8px 0 16px;
}
.nav-mobile.open { display: flex; }
.nav-mobile a {
  font-size: 15px;
  font-weight: 500;
  color: var(--seki);
  padding: 12px 24px;
  border-bottom: 1px solid var(--kiri);
  transition: color var(--transition), background var(--transition);
}
.nav-mobile a:last-child { border-bottom: none; }
.nav-mobile a:hover { color: var(--sumi); background: var(--kiri); }


/* ══════════════════════════════
   HERO
══════════════════════════════ */
.hero {
  position: relative;
  padding: 100px 24px 80px;
  overflow: hidden;
  background: var(--washi);
}
.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.hero-content { z-index: 1; }
.hero-content h1 {
  color: var(--sumi);
  margin-bottom: 20px;
}
.hero-content h1 span { color: var(--kincha); }
.hero-sub {
  font-size: 18px;
  color: var(--seki);
  margin-bottom: 36px;
  max-width: 460px;
  line-height: 1.6;
}
.hero-image {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.hero-image img {
  width: 320px;
  height: auto;
  opacity: 0.15;
}


/* ══════════════════════════════
   SERVICES
══════════════════════════════ */
.services {
  background: var(--kiri);
  padding: var(--section-pad);
}
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 8px;
}
.service-card {
  background: var(--washi);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: transform var(--transition), box-shadow var(--transition);
}
.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(30,26,20,0.08);
}
.service-icon {
  width: 44px;
  height: 44px;
  margin-bottom: 20px;
}
.service-card h3 {
  margin-bottom: 12px;
  color: var(--sumi);
}
.service-card p {
  font-size: 15px;
  color: var(--seki);
  line-height: 1.7;
}


/* ══════════════════════════════
   ABOUT
══════════════════════════════ */
.about {
  padding: var(--section-pad);
  background: var(--washi);
}
.about-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 64px;
  align-items: start;
}
.about-photo {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--kiri);
  aspect-ratio: 4/5;
  display: flex;
  align-items: center;
  justify-content: center;
}
.about-photo img, .about-photo svg { width: 100%; height: 100%; object-fit: cover; }

.about-text h2 { margin-bottom: 6px; }
.about-text .divider { margin: 14px 0 24px; }
.about-text p { font-size: 16px; color: var(--seki); margin-bottom: 16px; }
.about-text p:last-of-type { margin-bottom: 0; }

.about-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 0;
  margin-top: 36px;
  padding-top: 28px;
  border-top: 1px solid var(--kiri);
  font-size: 13px;
  font-weight: 500;
  color: var(--chestnut);
  letter-spacing: 0.03em;
}
.about-stats span { padding-right: 20px; }
.about-stats span::after {
  content: '·';
  margin-left: 20px;
  color: var(--kiri);
}
.about-stats span:last-child::after { display: none; }


/* ══════════════════════════════
   WHY KAIZEN BULL
══════════════════════════════ */
.why {
  background: var(--sumi);
  padding: var(--section-pad);
}
.why .section-label { color: var(--chestnut); }
.why h2 { color: var(--washi); }
.why .divider { background: var(--kincha); }

.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 8px;
}
.why-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: 36px 28px;
}
.why-number {
  font-family: var(--font-display);
  font-size: 42px;
  color: var(--kincha);
  margin-bottom: 16px;
  line-height: 1;
}
.why-card h3 { color: var(--washi); margin-bottom: 12px; }
.why-card p { font-size: 15px; color: var(--kiri); line-height: 1.7; }


/* ══════════════════════════════
   CONTACT FORM
══════════════════════════════ */
.contact {
  background: var(--washi);
  padding: var(--section-pad);
}
.contact-inner {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
}
.contact-inner h2 { margin-bottom: 8px; }
.contact-inner .section-label { display: block; }
.contact-inner .divider { margin: 14px auto 12px; }
.contact-sub {
  font-size: 16px;
  color: var(--seki);
  margin-bottom: 44px;
}

.contact-form {
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.form-group label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--sumi);
}
.form-group input:not([type="checkbox"]),
.form-group select,
.form-group textarea {
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--sumi);
  background: var(--white);
  border: 1.5px solid var(--kiri);
  border-radius: var(--radius);
  padding: 12px 16px;
  transition: border-color var(--transition);
  width: 100%;
  appearance: none;
}
.form-group input:not([type="checkbox"]):focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--chestnut);
}
.form-group textarea { resize: vertical; min-height: 130px; }
.form-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%236B6B6B' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 40px;
}

.form-consent { margin-top: 4px; }
.consent-label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  cursor: pointer;
  font-size: 13px;
  color: var(--seki);
  line-height: 1.5;
}
.consent-label input[type="checkbox"] {
  margin-top: 3px;
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  accent-color: var(--chestnut);
  cursor: pointer;
}

.form-submit { text-align: center; margin-top: 8px; }
.form-submit .btn { min-width: 200px; font-size: 14px; }

.form-status {
  text-align: center;
  font-size: 15px;
  padding: 14px;
  border-radius: var(--radius);
  display: none;
}
.form-status.success { background: #e8f5e9; color: #2e7d32; display: block; }
.form-status.error   { background: #fdecea; color: #c62828; display: block; }


/* ══════════════════════════════
   FOOTER
══════════════════════════════ */
.footer {
  background: var(--sumi);
  padding: 56px 24px 32px;
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 48px;
  align-items: start;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand img { height: 60px; width: auto; margin-bottom: 16px; }
.footer-tagline {
  font-size: 13px;
  color: var(--seki);
  margin-bottom: 8px;
}
.footer-email a {
  font-size: 14px;
  color: var(--kincha);
  font-weight: 500;
  transition: opacity var(--transition);
}
.footer-email a:hover { opacity: 0.75; }

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-end;
}
.footer-links a {
  font-size: 13px;
  color: var(--kiri);
  font-weight: 500;
  letter-spacing: 0.04em;
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--washi); }

.footer-socials { display: flex; flex-direction: column; gap: 12px; }
.footer-socials-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--kincha);
}
.social-link {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--kiri);
  font-size: 13px;
  transition: color var(--transition);
}
.social-link:hover { color: var(--washi); }

.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-top: 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.footer-copy {
  font-size: 12px;
  color: var(--seki);
}
.footer-location {
  font-size: 12px;
  color: var(--seki);
}


/* ══════════════════════════════
   CASE STUDIES PAGE
══════════════════════════════ */
.page-hero {
  background: var(--sumi);
  padding: 80px 24px 64px;
  text-align: center;
}
.page-hero h1 { color: var(--washi); }
.page-hero p  { color: var(--kiri); font-size: 17px; margin-top: 16px; max-width: 520px; margin-left: auto; margin-right: auto; }

.case-studies-section {
  padding: var(--section-pad);
  background: var(--washi);
}
.case-studies-note {
  background: var(--kiri);
  border-left: 3px solid var(--kincha);
  border-radius: var(--radius);
  padding: 16px 20px;
  font-size: 14px;
  color: var(--seki);
  margin-bottom: 48px;
}
.case-studies-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.case-card {
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--kiri);
  padding: 32px 28px;
  transition: box-shadow var(--transition), transform var(--transition);
}
.case-card:hover {
  box-shadow: 0 6px 24px rgba(30,26,20,0.07);
  transform: translateY(-2px);
}
.case-tag {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--chestnut);
  margin-bottom: 14px;
}
.case-card h3 { font-size: 18px; margin-bottom: 12px; color: var(--sumi); }
.case-card p  { font-size: 14px; color: var(--seki); line-height: 1.7; }
.case-placeholder {
  display: inline-block;
  margin-top: 16px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--kiri);
  border: 1px dashed var(--kiri);
  padding: 6px 14px;
  border-radius: 2px;
}


/* ══════════════════════════════
   RESPONSIVE
══════════════════════════════ */
@media (max-width: 1024px) {
  .about-inner { grid-template-columns: 280px 1fr; gap: 40px; }
}

@media (max-width: 768px) {
  :root { --section-pad: 64px 20px; }

  /* Nav */
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }

  /* Hero */
  .hero { padding: 64px 20px 52px; }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-image { display: none; }
  .hero-sub { font-size: 16px; }

  /* Services */
  .services-grid { grid-template-columns: 1fr; }

  /* About */
  .about-inner { grid-template-columns: 1fr; }
  .about-photo { max-width: 280px; }

  /* Why */
  .why-grid { grid-template-columns: 1fr; }

  /* Contact form */
  .form-row { grid-template-columns: 1fr; }

  /* Footer */
  .footer-inner { grid-template-columns: 1fr; }
  .footer-links { align-items: flex-start; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }

  /* Case studies */
  .case-studies-grid { grid-template-columns: 1fr; }
}


/* ══════════════════════════════
   COSMETIC POLISH
══════════════════════════════ */

/* ── Hero canvas ── */
#heroCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}
.hero-content,
.hero-image {
  position: relative;
  z-index: 1;
}

/* Hero logo — pulsing background watermark */
@keyframes logoPulse {
  0%, 100% { transform: scale(1); }
  50%       { transform: scale(1.25); }
}

.hero-image img {
  opacity: 0.15;
  animation: logoPulse 4s ease-in-out infinite;
  transform-origin: center;
}

@media (prefers-reduced-motion: reduce) {
  .hero-image img { animation: none; }
}

/* ── Nav logo — reduce from 135px ── */
.nav-logo img { height: 72px; }

/* ── Nav link — sliding kincha underline on hover ── */
.nav-links a:not(.btn) {
  position: relative;
}
.nav-links a:not(.btn)::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--kincha);
  transition: width 0.3s ease;
}
.nav-links a:not(.btn):hover::after { width: 100%; }

/* ── Divider — gradient fade instead of solid block ── */
.divider {
  width: 60px;
  background: linear-gradient(to right, var(--kincha), transparent);
}

/* ── Button — shimmer sweep on hover ── */
.btn-primary {
  position: relative;
  overflow: hidden;
}
.btn-primary::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 55%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.22),
    transparent
  );
  transform: skewX(-18deg);
  transition: left 0.55s ease;
}
.btn-primary:hover::after { left: 150%; }

/* ── Service card — kincha left border + gold-tinted shadow on hover ── */
.service-card {
  border-left: 2px solid transparent;
}
.service-card:hover {
  border-left-color: var(--kincha);
  box-shadow:
    0 8px 40px rgba(201, 169, 110, 0.10),
    0 2px 8px rgba(30, 26, 20, 0.06);
}

/* ── Why numbers — soften the template feel ── */
.why-number { opacity: 0.55; }

/* ── Scroll reveal ── */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.reveal.in-view {
  opacity: 1;
  transform: none;
}
.reveal-delay-1 { transition-delay: 0.12s; }
.reveal-delay-2 { transition-delay: 0.24s; }
.reveal-delay-3 { transition-delay: 0.36s; }

/* ── Respect reduced motion ── */
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}