/* ==========================================
   H- creative solution — v3
   Decorative Minimal / White × Black
   ========================================== */

/* ---------- Variables ---------- */
:root {
  --white:  #ffffff;
  --black:  #0a0a0a;
  --gray:   #888888;
  --gray2:  #555555;
  --light:  #f7f7f7;
  --border: #e2e2e2;
  --border-dark: #222;

  --font-en:    'Inter', sans-serif;
  --font-ja:    'Noto Sans JP', sans-serif;
  --font-serif: 'Noto Serif JP', serif;

  --nav-h: 64px;
  --max-w: 980px;
  --sp:    clamp(80px, 11vw, 148px);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font-ja);
  color: var(--black);
  background: var(--white);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 clamp(24px, 5vw, 52px);
}

/* ---------- Scroll fade-in ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .65s ease, transform .65s ease;
}
.fade-in.in { opacity: 1; transform: translateY(0); }

/* ==========================================
   NAV
   ========================================== */
.nav {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  height: var(--nav-h);
  z-index: 100;
  background: rgba(255,255,255,0);
  transition: background .35s, border-color .35s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(255,255,255,.96);
  border-color: var(--border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.nav__inner {
  max-width: var(--max-w);
  height: 100%;
  margin: 0 auto;
  padding: 0 clamp(24px, 5vw, 52px);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-en);
  font-size: .80rem;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--black);
}
.nav__links {
  display: flex;
  gap: 36px;
}
.nav__links a {
  font-family: var(--font-en);
  font-size: .75rem;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--gray);
  transition: color .2s;
}
.nav__links a:hover { color: var(--black); }

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 7px;
  width: 24px;
  padding: 2px 0;
}
.nav__hamburger span {
  display: block;
  width: 100%; height: 1.5px;
  background: var(--black);
  transition: all .3s;
  transform-origin: center;
}
.nav__hamburger.open span:first-child { transform: translateY(8.5px) rotate(45deg); }
.nav__hamburger.open span:last-child  { transform: translateY(-8.5px) rotate(-45deg); }

@media (max-width: 680px) {
  .nav__hamburger { display: flex; }
  .nav__links {
    position: fixed;
    top: var(--nav-h); right: 0;
    width: 240px;
    height: calc(100dvh - var(--nav-h));
    background: var(--white);
    border-left: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    padding: 48px 32px;
    gap: 28px;
    transform: translateX(100%);
    transition: transform .35s ease;
  }
  .nav__links.open { transform: translateX(0); }
  .nav__links a { font-size: .9rem; color: var(--black); }
}

/* ==========================================
   HERO
   ========================================== */
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}

/* Decorative giant "H" */
.hero__bg-text {
  position: absolute;
  top: 50%;
  right: -2vw;
  transform: translateY(-50%);
  font-family: var(--font-en);
  font-size: clamp(260px, 38vw, 540px);
  font-weight: 900;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px #e8e8e8;
  user-select: none;
  pointer-events: none;
  letter-spacing: -.05em;
}

.hero__inner {
  position: relative;
  z-index: 1;
  width: 100%;
  padding-top: calc(var(--nav-h) + 80px);
  padding-bottom: clamp(80px, 12vw, 140px);
}

.hero__meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
  animation: fadeUp .8s .1s both;
}
.hero__tag {
  font-family: var(--font-en);
  font-size: .70rem;
  font-weight: 600;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--gray);
}
.hero__divider {
  display: inline-block;
  width: 32px;
  height: 1px;
  background: var(--border);
}

.hero__title {
  font-size: clamp(2.8rem, 8vw, 6rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -.03em;
  margin-bottom: 40px;
  animation: fadeUp .8s .25s both;
}
.hero__title-serif {
  font-family: var(--font-serif);
  font-weight: 400;
  letter-spacing: -.01em;
  display: inline-block;
  border-bottom: 2px solid var(--black);
  padding-bottom: 2px;
}

.hero__desc {
  font-size: clamp(.85rem, 1.6vw, 1rem);
  color: var(--gray2);
  line-height: 2.1;
  margin-bottom: 52px;
  animation: fadeUp .8s .4s both;
}

.hero__actions {
  display: flex;
  align-items: center;
  gap: 40px;
  animation: fadeUp .8s .55s both;
}
.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-en);
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .1em;
  border-bottom: 1.5px solid var(--black);
  padding-bottom: 4px;
  transition: opacity .2s, gap .2s;
}
.hero__cta:hover { opacity: .45; gap: 16px; }
.hero__cta--sub {
  font-family: var(--font-ja);
  font-size: .82rem;
  font-weight: 500;
  letter-spacing: .04em;
  border-color: var(--border);
  color: var(--gray);
}
.hero__cta--sub:hover { opacity: .6; gap: 10px; }

/* Scroll indicator */
.hero__scroll {
  position: absolute;
  bottom: clamp(32px, 6vw, 56px);
  right: clamp(24px, 5vw, 52px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  animation: fadeUp .8s .8s both;
}
.hero__scroll span {
  display: block;
  width: 1px;
  height: 52px;
  background: linear-gradient(to bottom, transparent, var(--gray));
  animation: scrollLine 2s ease-in-out infinite;
}
.hero__scroll small {
  font-family: var(--font-en);
  font-size: .60rem;
  font-weight: 600;
  letter-spacing: .18em;
  color: var(--gray);
  writing-mode: vertical-rl;
}

@keyframes scrollLine {
  0%   { transform: scaleY(0); transform-origin: top; }
  50%  { transform: scaleY(1); transform-origin: top; }
  51%  { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(22px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ==========================================
   INTRO STRIP
   ========================================== */
.intro-strip {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 18px 0;
  overflow: hidden;
  background: var(--light);
}
.intro-strip__inner { }
.intro-strip__text {
  font-family: var(--font-en);
  font-size: .75rem;
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--gray2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ==========================================
   SECTION COMMON
   ========================================== */
.section {
  padding: var(--sp) 0;
  border-top: 1px solid var(--border);
}
.section--dark {
  background: var(--black);
  color: var(--white);
  border-top: none;
}

.sec-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: clamp(48px, 8vw, 96px);
  flex-wrap: wrap;
}
.sec-head__left { }
.sec-head__en {
  display: block;
  font-family: var(--font-en);
  font-size: .68rem;
  font-weight: 600;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--gray);
  margin-bottom: 8px;
}
.sec-head--light .sec-head__en { color: #666; }
.sec-head__ja {
  font-size: clamp(1.6rem, 3.2vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -.03em;
  line-height: 1.15;
}
.sec-head--light .sec-head__ja { color: var(--white); }
.sec-head__desc {
  font-size: clamp(.80rem, 1.4vw, .92rem);
  color: var(--gray);
  line-height: 1.9;
  max-width: 360px;
  text-align: right;
}
.sec-head__desc--light { color: #666; }

/* ==========================================
   SERVICES
   ========================================== */
.service-list { }
.service-list__item {
  display: grid;
  grid-template-columns: 48px 1fr 24px;
  align-items: center;
  gap: 0 28px;
  padding: 26px 0;
  border-bottom: 1px solid var(--border);
  transition: background .2s;
}
.service-list__item:first-child { border-top: 1px solid var(--border); }

.service-list__num {
  font-family: var(--font-en);
  font-size: .68rem;
  font-weight: 600;
  letter-spacing: .12em;
  color: var(--gray);
  align-self: flex-start;
  padding-top: 4px;
}
.service-list__body { }
.service-list__name {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 6px;
  letter-spacing: -.01em;
}
.service-list__desc {
  font-size: .855rem;
  color: var(--gray2);
  line-height: 1.85;
}
.service-list__arrow {
  color: var(--border);
  flex-shrink: 0;
  transition: color .2s, transform .2s;
}
.service-list__item:hover .service-list__arrow {
  color: var(--black);
  transform: translateX(4px);
}

/* ==========================================
   COMMIT BANNER
   ========================================== */
.commit-banner {
  background: var(--black);
  color: var(--white);
  padding: clamp(40px, 6vw, 72px) 0;
  text-align: center;
}
.commit-banner__text {
  font-size: clamp(.92rem, 2vw, 1.15rem);
  line-height: 2;
  letter-spacing: .02em;
}
.commit-banner__text em {
  font-style: normal;
  font-family: var(--font-serif);
  font-weight: 700;
  letter-spacing: .04em;
  border-bottom: 1px solid rgba(255,255,255,.4);
  padding-bottom: 1px;
}

/* ==========================================
   STRENGTHS
   ========================================== */
.strength-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border-dark);
}
.strength-item {
  background: var(--black);
  padding: clamp(32px, 5vw, 56px);
}
.strength-item__num {
  font-family: var(--font-en);
  font-size: .68rem;
  font-weight: 600;
  letter-spacing: .22em;
  color: #444;
  margin-bottom: 24px;
}
.strength-item__title {
  font-size: clamp(1rem, 2vw, 1.2rem);
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 16px;
  color: var(--white);
}
.strength-item__desc {
  font-size: .855rem;
  color: #777;
  line-height: 1.9;
}

@media (max-width: 580px) {
  .strength-grid { grid-template-columns: 1fr; }
}

/* ==========================================
   ABOUT
   ========================================== */
.about-body { }
.about-main {
  max-width: 660px;
  margin-bottom: 56px;
}
.about-lead {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 1.8vw, 1.15rem);
  line-height: 2.0;
  margin-bottom: 24px;
  letter-spacing: .01em;
}
.about-text {
  font-size: clamp(.88rem, 1.5vw, .98rem);
  color: var(--gray2);
  line-height: 2.1;
}
.about-meta { max-width: 560px; }
.about-meta__row {
  display: flex;
  align-items: baseline;
  gap: 32px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}
.about-meta__row:first-child { border-top: 1px solid var(--border); }
.about-meta dt {
  font-family: var(--font-en);
  font-size: .68rem;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gray);
  min-width: 76px;
  flex-shrink: 0;
}
.about-meta dd {
  font-size: .92rem;
  font-weight: 500;
}

/* ==========================================
   CONTACT
   ========================================== */
.section--contact {
  border-top: 1px solid var(--border);
  text-align: center;
  padding: var(--sp) 0;
}
.contact-title {
  font-size: clamp(1.8rem, 4vw, 3.2rem);
  font-weight: 700;
  letter-spacing: -.03em;
  margin-bottom: 8px;
  line-height: 1.15;
}
.contact-desc {
  font-size: clamp(.84rem, 1.5vw, .98rem);
  color: var(--gray);
  line-height: 2.1;
  margin-bottom: 52px;
  margin-top: 20px;
}
.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-en);
  font-size: clamp(.82rem, 1.4vw, .96rem);
  font-weight: 600;
  letter-spacing: .06em;
  border-bottom: 1.5px solid var(--black);
  padding-bottom: 4px;
  transition: opacity .2s, gap .2s;
}
.contact-btn:hover { opacity: .4; gap: 18px; }

/* ==========================================
   FOOTER
   ========================================== */
.footer {
  border-top: 1px solid var(--border);
  padding: 44px 0;
}
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}
.footer__logo {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-en);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .06em;
}
.footer__nav {
  display: flex;
  gap: 28px;
}
.footer__nav a {
  font-family: var(--font-en);
  font-size: .70rem;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--gray);
  transition: color .2s;
}
.footer__nav a:hover { color: var(--black); }
.footer__copy {
  width: 100%;
  font-size: .70rem;
  color: #bbb;
  font-family: var(--font-en);
  letter-spacing: .06em;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  margin-top: 4px;
}

/* ==========================================
   RESPONSIVE
   ========================================== */
@media (max-width: 680px) {
  .hero__bg-text { font-size: 52vw; right: -8vw; }
  .hero__actions { flex-direction: column; align-items: flex-start; gap: 20px; }
  .hero__scroll { display: none; }
  .sec-head { flex-direction: column; align-items: flex-start; gap: 12px; }
  .sec-head__desc { text-align: left; max-width: 100%; }
  .service-list__item { grid-template-columns: 40px 1fr 20px; gap: 0 16px; }
  .section--contact { text-align: left; }
  .footer__inner { flex-direction: column; align-items: flex-start; }
  .footer__copy { text-align: left; }
}