:root {
  --warm-white: #FAF8F5;
  --cream: #F3EDE4;
  --sand: #E8DFD1;
  --clay: #C9B99A;
  --stone: #8A7E6B;
  --charcoal: #2C2824;
  --ink: #1A1714;
  --accent-copper: #B87333;
  --accent-copper-light: #D4956A;
  --accent-blue: #4A6FA5;
  --accent-blue-light: #7B9CC7;
  --accent-teal: #3D8B8B;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Outfit', 'Noto Sans JP', sans-serif;
  background: var(--warm-white);
  color: var(--charcoal);
  overflow-x: hidden;
  line-height: 1.7;
}

/* ===== GRID OVERLAY ===== */
.grid-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.03;
  background-image:
    linear-gradient(var(--stone) 1px, transparent 1px),
    linear-gradient(90deg, var(--stone) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* ===== NAV ===== */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 1.5rem 3rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(250, 248, 245, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(200, 185, 154, 0.2);
  transition: all 0.4s ease;
}

.nav-logo {
  font-family: 'DM Serif Display', serif;
  font-size: 1.6rem;
  color: var(--ink);
  letter-spacing: -0.02em;
  text-decoration: none;
}

.nav-logo span {
  color: var(--accent-copper);
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--stone);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: color 0.3s;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0;
  height: 1.5px;
  background: var(--accent-copper);
  transition: width 0.3s ease;
}

.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after { width: 100%; }

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 8rem 3rem 4rem;
  overflow: hidden;
}

.hero-bg-shapes {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  pointer-events: none;
  z-index: 0;
}

.hero-bg-shapes .shape {
  position: absolute;
  border: 1px solid rgba(184, 115, 51, 0.12);
}

.shape-1 {
  width: 500px; height: 500px;
  top: 10%; right: -5%;
  border-radius: 50%;
  animation: float-slow 20s ease-in-out infinite;
}

.shape-2 {
  width: 300px; height: 300px;
  bottom: 15%; right: 15%;
  transform: rotate(45deg);
  animation: float-slow 15s ease-in-out infinite reverse;
}

.shape-3 {
  width: 200px; height: 200px;
  top: 25%; left: 5%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(184, 115, 51, 0.04), transparent 70%);
  border: none;
  animation: float-slow 18s ease-in-out infinite 3s;
}

.shape-4 {
  width: 1px; height: 60vh;
  top: 10%; right: 35%;
  border: none;
  background: linear-gradient(to bottom, transparent, rgba(184, 115, 51, 0.1), transparent);
}

.shape-5 {
  width: 60vw; height: 1px;
  bottom: 25%; left: -5%;
  border: none;
  background: linear-gradient(to right, transparent, rgba(74, 111, 165, 0.08), transparent);
}

@keyframes float-slow {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  33% { transform: translate(15px, -20px) rotate(2deg); }
  66% { transform: translate(-10px, 10px) rotate(-1deg); }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-copper);
  margin-bottom: 2rem;
  opacity: 0;
  animation: fadeUp 0.8s ease forwards 0.3s;
}

.hero-tag::before {
  content: '';
  display: block;
  width: 40px;
  height: 1.5px;
  background: var(--accent-copper);
}

.hero-title {
  font-family: 'DM Serif Display', serif;
  font-size: clamp(3rem, 7vw, 5.5rem);
  line-height: 1.05;
  color: var(--ink);
  margin-bottom: 2rem;
  letter-spacing: -0.03em;
  opacity: 0;
  animation: fadeUp 0.8s ease forwards 0.5s;
}

.hero-title .highlight {
  color: var(--accent-copper);
  position: relative;
}

.hero-title .line-2 {
  display: block;
  font-style: italic;
  color: var(--accent-blue);
  font-size: 0.65em;
  margin-top: 0.2em;
}

.hero-desc {
  font-size: 1.15rem;
  font-weight: 300;
  color: var(--stone);
  max-width: 600px;
  line-height: 1.9;
  margin-bottom: 3rem;
  opacity: 0;
  animation: fadeUp 0.8s ease forwards 0.7s;
}

.hero-cta {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.8s ease forwards 0.9s;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 2.25rem;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: inherit;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.35s ease;
}

.btn-primary {
  background: var(--ink);
  color: var(--warm-white);
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 100%;
  background: var(--accent-copper);
  transition: left 0.4s ease;
  z-index: 0;
}

.btn-primary:hover::before { left: 0; }
.btn-primary span { position: relative; z-index: 1; }

.btn-outline {
  background: transparent;
  color: var(--charcoal);
  border: 1.5px solid var(--sand);
}

.btn-outline:hover {
  border-color: var(--accent-copper);
  color: var(--accent-copper);
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== CONCEPT SECTION ===== */
.concept {
  position: relative;
  padding: 8rem 3rem;
  background: var(--cream);
}

.concept-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: center;
}

.concept-visual {
  position: relative;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.concept-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid var(--clay);
  animation: ring-rotate 30s linear infinite;
}

.concept-ring:nth-child(1) { width: 100%; height: 100%; }
.concept-ring:nth-child(2) { width: 75%; height: 75%; animation-direction: reverse; animation-duration: 25s; border-style: dashed; }
.concept-ring:nth-child(3) { width: 50%; height: 50%; animation-duration: 20s; }

@keyframes ring-rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.concept-center {
  position: relative;
  z-index: 2;
  text-align: center;
}

.concept-center .logo-big {
  font-family: 'DM Serif Display', serif;
  font-size: 3rem;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.concept-center .logo-big .io {
  color: var(--accent-copper);
}

.concept-center .tagline {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--stone);
  margin-top: 0.75rem;
}

.concept-text h2 {
  font-family: 'DM Serif Display', serif;
  font-size: 2.5rem;
  color: var(--ink);
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.concept-text p {
  color: var(--stone);
  font-weight: 300;
  font-size: 1.05rem;
  line-height: 2;
  margin-bottom: 1.25rem;
}

.name-breakdown {
  margin-top: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.name-part {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1.25rem 1.5rem;
  background: var(--warm-white);
  border-left: 3px solid var(--accent-copper);
  transition: transform 0.3s ease;
}

.name-part:nth-child(2) {
  border-left-color: var(--accent-blue);
}

.name-part:hover {
  transform: translateX(8px);
}

.name-part .label {
  font-family: 'DM Serif Display', serif;
  font-size: 1.3rem;
  color: var(--ink);
  min-width: 100px;
}

.name-part .desc {
  font-size: 0.9rem;
  color: var(--stone);
  font-weight: 300;
}

/* ===== SERVICES ===== */
.services {
  padding: 8rem 3rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 5rem;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-copper);
  margin-bottom: 1rem;
}

.section-title {
  font-family: 'DM Serif Display', serif;
  font-size: 2.5rem;
  color: var(--ink);
  line-height: 1.2;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.service-card {
  padding: 2.5rem;
  background: var(--warm-white);
  border: 1px solid var(--sand);
  position: relative;
  overflow: hidden;
  transition: all 0.4s ease;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 3px;
  background: linear-gradient(90deg, var(--accent-copper), var(--accent-blue));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.service-card:hover::before { transform: scaleX(1); }
.service-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 50px rgba(44, 40, 36, 0.06);
}

.service-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
  color: var(--warm-white);
  position: relative;
}

.service-icon svg {
  width: 32px;
  height: 32px;
  stroke: var(--accent-copper);
  fill: none;
  stroke-width: 1.5;
}

.service-icon::after {
  content: '';
  position: absolute;
  width: 100%; height: 100%;
  background: var(--cream);
  border-radius: 12px;
  z-index: -1;
}

.service-card h3 {
  font-family: 'DM Serif Display', serif;
  font-size: 1.3rem;
  color: var(--ink);
  margin-bottom: 1rem;
}

.service-card p {
  font-size: 0.9rem;
  color: var(--stone);
  font-weight: 300;
  line-height: 1.8;
}

.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.service-tags span {
  font-size: 0.7rem;
  padding: 0.3rem 0.75rem;
  background: var(--cream);
  color: var(--stone);
  font-weight: 500;
  letter-spacing: 0.04em;
}

/* ===== VISION ===== */
.vision {
  padding: 8rem 3rem;
  background: linear-gradient(135deg, var(--cream) 0%, rgba(74, 111, 165, 0.06) 100%);
  position: relative;
}

.vision-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.vision-text h2 {
  font-family: 'DM Serif Display', serif;
  font-size: 2.5rem;
  color: var(--ink);
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.vision-text p {
  color: var(--stone);
  font-weight: 300;
  font-size: 1.05rem;
  line-height: 2;
  margin-bottom: 1.25rem;
}

.vision-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.vision-keywords {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.keyword-item {
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
  padding: 2.5rem 2rem;
  background: var(--warm-white);
  border: 1px solid var(--sand);
  transition: all 0.3s ease;
}

.keyword-item:hover {
  border-color: var(--accent-copper);
  transform: translateX(8px);
}

.keyword-num {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-copper);
  letter-spacing: 0.05em;
}

.keyword-word {
  font-family: 'DM Serif Display', serif;
  font-size: 2rem;
  color: var(--ink);
  line-height: 1;
}

.keyword-en {
  font-size: 0.8rem;
  color: var(--clay);
  font-weight: 300;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ===== PROFILE ===== */
.profile {
  padding: 8rem 3rem;
  max-width: 900px;
  margin: 0 auto;
}

.profile-card {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 3rem;
  align-items: start;
  padding: 3rem;
  background: var(--cream);
  border: 1px solid var(--sand);
}

.profile-avatar {
  width: 200px;
  height: 200px;
  background: linear-gradient(135deg, var(--sand), var(--clay));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.profile-avatar svg {
  width: 80px;
  height: 80px;
  stroke: var(--warm-white);
  fill: none;
  stroke-width: 1;
  opacity: 0.6;
}

.profile-info h3 {
  font-family: 'DM Serif Display', serif;
  font-size: 1.8rem;
  color: var(--ink);
  margin-bottom: 0.5rem;
}

.profile-info .role {
  font-size: 0.85rem;
  color: var(--accent-copper);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.profile-info p {
  color: var(--stone);
  font-weight: 300;
  font-size: 0.95rem;
  line-height: 1.9;
  margin-bottom: 1.5rem;
}

.credentials {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.credential {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--warm-white);
  border: 1px solid var(--sand);
  font-size: 0.8rem;
  color: var(--charcoal);
  font-weight: 500;
}

.credential .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-copper);
}

.credential .dot.blue {
  background: var(--accent-blue);
}

/* ===== CONTACT ===== */
.contact {
  padding: 8rem 3rem;
  background: var(--ink);
  color: var(--warm-white);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.contact::before {
  content: '';
  position: absolute;
  width: 600px; height: 600px;
  border-radius: 50%;
  border: 1px solid rgba(184, 115, 51, 0.1);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
}

.contact h2 {
  font-family: 'DM Serif Display', serif;
  font-size: 2.5rem;
  margin-bottom: 1rem;
  position: relative;
}

.contact p {
  font-weight: 300;
  color: var(--clay);
  margin-bottom: 3rem;
  position: relative;
}

.contact-email {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: 'DM Serif Display', serif;
  font-size: 1.5rem;
  color: var(--accent-copper-light);
  text-decoration: none;
  transition: color 0.3s;
  position: relative;
}

.contact-email:hover {
  color: var(--warm-white);
}

/* ===== FOOTER ===== */
footer {
  padding: 2rem 3rem;
  background: var(--ink);
  border-top: 1px solid rgba(200, 185, 154, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

footer .footer-logo {
  font-family: 'DM Serif Display', serif;
  font-size: 1.1rem;
  color: var(--clay);
}

footer .footer-logo span { color: var(--accent-copper); }

footer .copyright {
  font-size: 0.75rem;
  color: var(--stone);
  font-weight: 300;
}

/* ===== SCROLL ANIMATIONS ===== */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  nav { padding: 1rem 1.5rem; }
  .nav-links { display: none; }
  .hero { padding: 7rem 1.5rem 3rem; }
  .hero-title { font-size: clamp(2.2rem, 8vw, 3.5rem); }
  .concept-inner { grid-template-columns: 1fr; gap: 3rem; }
  .concept-visual { max-width: 300px; margin: 0 auto; }
  .services-grid { grid-template-columns: 1fr; }
  .vision-inner { grid-template-columns: 1fr; }
  .profile-card { grid-template-columns: 1fr; justify-items: center; text-align: center; }
  .credentials { justify-content: center; }
  .hero-cta { justify-content: center; }
  footer { flex-direction: column; gap: 1rem; text-align: center; }
  .section-title { font-size: 2rem; }
}

/* ===== HAMBURGER MOBILE ===== */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 32px;
  height: 24px;
  position: relative;
}

.mobile-menu-btn span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--ink);
  position: absolute;
  left: 0;
  transition: all 0.3s;
}

.mobile-menu-btn span:nth-child(1) { top: 0; }
.mobile-menu-btn span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.mobile-menu-btn span:nth-child(3) { bottom: 0; }

/* NOTE: Mobile menu backdrop (hidden by default) */
.mobile-menu-backdrop {
  display: none;
}

@media (max-width: 900px) {
  .mobile-menu-btn { display: block; }

  /* NOTE: Make nav background opaque when menu is open */
  nav:has(.nav-links.active) {
    background: var(--warm-white);
  }

  /* NOTE: Dark backdrop overlay on main content (below header) */
  .mobile-menu-backdrop {
    display: block;
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(26, 23, 20, 0.5);
    backdrop-filter: blur(4px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    z-index: 99;
  }

  .mobile-menu-backdrop.active {
    opacity: 1;
    visibility: visible;
  }

  /* NOTE: Mobile menu expanded state */
  .nav-links {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--warm-white);
    padding: 2rem;
    gap: 1.5rem;
    border-top: 1px solid rgba(200, 185, 154, 0.3);
    box-shadow: inset 0 4px 8px -4px rgba(26, 23, 20, 0.1);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
  }

  .nav-links.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  /* NOTE: Hamburger to X animation */
  .mobile-menu-btn.active span:nth-child(1) {
    top: 50%;
    transform: translateY(-50%) rotate(45deg);
  }

  .mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
  }

  .mobile-menu-btn.active span:nth-child(3) {
    bottom: 50%;
    transform: translateY(50%) rotate(-45deg);
  }
}