:root {
  --ink:     #1a1209;
  --ink-mid: #4a3f35;
  --ink-light: #8a7e74;
  --paper:   #f7f3ec;
  --paper-dark: #ede8de;
  --red:     #922530;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Serif JP', serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.9;
}

/* ─── NAV ─── */
header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 3rem;
  background: rgba(247,243,236,0.93);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--paper-dark);
}

header img { height: 88px; }

nav { display: flex; align-items: center; gap: 2.5rem; }

nav a {
  text-decoration: none;
  color: var(--ink-mid);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  position: relative;
  transition: color .25s;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  height: 1px; width: 0;
  background: var(--red);
  transition: width .25s;
}

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

.lang-switch {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding-left: 1.8rem;
  border-left: 1px solid var(--paper-dark);
  margin-left: 0.5rem;
}
.lang-sep { color: var(--paper-dark); font-size: 0.72rem; }
.lang-btn {
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  color: var(--ink-light);
  text-decoration: none;
  transition: color .2s;
}
.lang-btn.active { color: var(--red); font-weight: 600; }
a.lang-btn:hover { color: var(--red); }

/* ─── HERO ─── */
#hero {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding: 8rem 3rem 5rem;
  position: relative;
  overflow: hidden;
  background-color: var(--paper);
  background-image: url('../images/tech-fusion-bg.svg');
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
}

#hero::before {
  content: '';
  position: absolute;
  left: 1.5rem; top: 15%; bottom: 15%;
  width: 1px;
  background: linear-gradient(to bottom, transparent, var(--ink-light), transparent);
}

.hero-inner {
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 4rem;
}

h1 {
  font-family: 'Shippori Mincho B1', serif;
  font-size: clamp(2rem, 4.5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.55;
  letter-spacing: 0.06em;
  margin-top: 2rem;
  margin-bottom: 1.5rem;
}

h1 em {
  font-style: normal;
  color: var(--red);
}

.hero-body {
  font-size: 0.95rem;
  color: var(--ink-mid);
  line-height: 2.1;
  margin-bottom: 2.5rem;
}

.btn {
  display: inline-block;
  padding: 0.85rem 2.4rem;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  border-radius: 9999px;
  transition: background .25s;
}

.btn:hover { background: var(--red); }

.hero-logo {
  width: 440px;
  height: auto;
}

/* ─── SECTION BASE ─── */
section { padding: 6rem 3rem; }

.wrap { max-width: 960px; margin: 0 auto; }

.sec-en {
  font-size: 0.68rem;
  letter-spacing: 0.4em;
  color: var(--red);
  display: block;
  margin-bottom: 0.6rem;
}

h2 {
  font-family: 'Shippori Mincho B1', serif;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 600;
  letter-spacing: 0.06em;
  margin-bottom: 0.8rem;
}

.rule {
  width: 2.5rem;
  height: 1px;
  background: var(--red);
  margin-bottom: 3rem;
}

/* ─── ABOUT ─── */
#about { background: #faf8f3; }

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about-text p {
  color: var(--ink-mid);
  font-size: 0.95rem;
  line-height: 2.1;
  margin-bottom: 1.2rem;
}

.values { display: flex; flex-direction: column; gap: 2rem; margin-top: 0.5rem; }

.val {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}

.val-num {
  font-family: 'Shippori Mincho B1', serif;
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--paper-dark);
  line-height: 1;
  flex-shrink: 0;
  width: 2rem;
}

.val-body h3 {
  font-family: 'Shippori Mincho B1', serif;
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  letter-spacing: 0.05em;
}

.val-body p {
  font-size: 0.88rem;
  color: var(--ink-mid);
  line-height: 1.9;
}

/* ─── SERVICES ─── */
#services { background: var(--paper); }

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.card {
  background: #faf8f3;
  padding: 2rem;
  border-top: 2px solid var(--paper-dark);
  transition: border-color .25s, transform .25s;
}

.card:hover {
  border-color: var(--red);
  transform: translateY(-3px);
}

.card-icon {
  margin-bottom: 1.2rem;
  color: var(--ink-light);
}

.card h3 {
  font-family: 'Shippori Mincho B1', serif;
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.8rem;
  letter-spacing: 0.04em;
}

.card p {
  font-size: 0.88rem;
  color: var(--ink-mid);
  line-height: 2;
}

/* ─── MEMBERS ─── */
#members { background: #faf8f3; }

.members-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.member {
  background: var(--paper);
  padding: 2.5rem 2rem;
  text-align: center;
  border-top: 2px solid var(--paper-dark);
  transition: border-color .25s, transform .25s;
}

.member:hover {
  border-color: var(--red);
  transform: translateY(-3px);
}

.member-avatar {
  width: 68px;
  height: 68px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Shippori Mincho B1', serif;
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 auto 1.2rem;
}

.member:nth-child(2) .member-avatar { background: var(--red); }

.member h3 {
  font-family: 'Shippori Mincho B1', serif;
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
  letter-spacing: 0.04em;
}

.member-role {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--red);
  margin-bottom: 1rem;
}

.member p {
  font-size: 0.85rem;
  color: var(--ink-mid);
  line-height: 1.9;
  text-align: left;
}

/* ─── CONTACT ─── */
#contact { background: #faf8f3; }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 4rem;
}

.contact-lead {
  font-size: 0.95rem;
  color: var(--ink-mid);
  line-height: 2.1;
  margin-bottom: 2rem;
}

form {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.field { display: flex; flex-direction: column; gap: 0.4rem; }

label {
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--ink-mid);
}

input, textarea {
  font-family: 'Noto Serif JP', serif;
  font-size: 0.9rem;
  background: var(--paper);
  border: 1px solid var(--paper-dark);
  padding: 0.7rem 0.9rem;
  color: var(--ink);
  outline: none;
  transition: border-color .2s;
}

input:focus, textarea:focus { border-color: var(--ink-mid); }
textarea { height: 140px; resize: vertical; }

.submit {
  align-self: flex-start;
  border: none;
  cursor: pointer;
}

.form-msg {
  font-size: 0.85rem;
  padding: 0.75rem 1rem;
  border-left: 3px solid transparent;
  line-height: 1.6;
}
.form-msg--success {
  color: #2d6a4f;
  border-left-color: #2d6a4f;
  background: rgba(45, 106, 79, 0.07);
}
.form-msg--error {
  color: var(--red);
  border-left-color: var(--red);
  background: rgba(146, 37, 48, 0.07);
}

/* ─── FOOTER ─── */
footer {
  background: var(--ink);
  color: rgba(247,243,236,0.45);
  padding: 2.5rem 3rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.2rem;
}

footer img {
  height: 72px;
  filter: brightness(0) invert(1);
  opacity: 0.7;
}

.foot-nav {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.foot-nav a {
  text-decoration: none;
  color: rgba(247,243,236,0.45);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  transition: color .2s;
}

.foot-nav a:hover { color: rgba(247,243,236,0.9); }

.copy { font-size: 0.75rem; letter-spacing: 0.1em; }

/* ─── DIVIDER ─── */
.hr {
  border: none;
  border-top: 1px solid var(--paper-dark);
  margin: 0;
}

/* ─── FADE IN ─── */
.fade {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .7s ease, transform .7s ease;
}

.fade.on {
  opacity: 1;
  transform: none;
}

/* ─── WASHI OVERLAY ─── */
.washi-overlay {
  position: fixed;
  inset: 0;
  z-index: 9000;
  pointer-events: none;
  background-repeat: repeat;
  background-size: 500px 500px;
  opacity: 0.45;
  mix-blend-mode: multiply;
}

/* ─── RESPONSIVE ─── */
@media (max-width: 768px) {
  header { padding: 1rem 0.9rem; }
  header > a img { display: none; }
  #hero::before { display: none; }
  nav { gap: 0.45rem; }
  nav a { font-size: 0.62rem; white-space: nowrap; }
  .lang-btn { font-size: 0.6rem; white-space: nowrap; }
  .lang-switch { padding-left: 0.5rem; gap: 0.25rem; }

  section { padding: 4rem 1.2rem; }

  #hero { padding: 7rem 1.2rem 4rem; }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .hero-logo { width: 320px; order: -1; justify-self: center; }
  #hero .btn { display: block; margin: 0 auto; width: fit-content; }
  .submit { align-self: center; }

  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .services-grid,
  .members-grid {
    grid-template-columns: 1fr;
  }

  footer { padding: 2.5rem 1.2rem; }
  .foot-nav { gap: 0.7rem; }
  .foot-nav a { font-size: 0.66rem; letter-spacing: 0.04em; white-space: nowrap; }
}