/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --ink:        #333333;
  --ink-mid:    #555555;
  --ink-sub:    #999999;
  --paper:      #ffffff;
  --paper-warm: #f5f5f3;
  --border:     #e5e5e0;
  --accent:     #b89a5e;
  --accent-lt:  #d4bc8e;
  --white:      #ffffff;

  --font-en:     'Montserrat', 'Helvetica Neue', sans-serif;
  --font-ja:     'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', sans-serif;
  --font-mincho: 'Noto Serif JP', 'Hiragino Mincho ProN', 'Yu Mincho', serif;
  --font-sans:   'Noto Sans JP', -apple-system, 'Hiragino Kaku Gothic ProN', sans-serif;

  --max-w: 1160px;
  --gutter: 40px;
  --t: 0.35s;
  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-ja);
  font-weight: 300;
  line-height: 1.75;
  letter-spacing: 0.05em;
  overflow-x: hidden;
  font-feature-settings: "palt";
  -webkit-font-feature-settings: "palt";
  -webkit-font-smoothing: antialiased;
}
@media screen and (min-width: 1024px) {
  body { line-height: 2; }
}

img { display: block; max-width: 100%; height: auto; }
a   { color: inherit; text-decoration: none; }
em  { font-style: normal; }

/* ============================================================
   UTILITIES
   ============================================================ */
.section-label {
  display: block;
  font-family: var(--font-en);
  font-size: 0.72rem;
  font-weight: 300;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-ja);
  font-size: clamp(1.5rem, 2.8vw, 2.2rem);
  font-weight: 400;
  letter-spacing: 0.05em;
  line-height: 1.5;
}

/* ============================================================
   SCROLL REVEAL
   ============================================================ */
.js-reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.js-reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ============================================================
   HEADER
   ============================================================ */
.header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 200;
  background: rgba(248, 247, 244, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t), background var(--t);
}
.header.is-scrolled {
  border-color: var(--border);
}

.header__inner {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  font-family: var(--font-en);
  font-size: 1.4rem;
  font-weight: 300;
  letter-spacing: 0.12em;
  color: var(--ink);
  transition: opacity var(--t);
}
.header__logo:hover { opacity: 0.5; }

.header__nav {
  display: flex;
  align-items: center;
  gap: 40px;
}
.header__nav a {
  font-family: var(--font-en);
  font-size: 0.82rem;
  font-weight: 300;
  letter-spacing: 0;
  color: var(--ink-mid);
  position: relative;
  transition: color var(--t);
}
.header__nav a::after {
  content: '';
  position: absolute;
  inset: auto 0 -2px;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--t) var(--ease);
}
.header__nav a:hover { color: var(--ink); }
.header__nav a:hover::after { transform: scaleX(1); transform-origin: left; }

.header__burger {
  display: none;
  flex-direction: column;
  gap: 7px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  width: 28px;
}
.header__burger span {
  display: block;
  height: 1px;
  background: var(--ink);
  transition: transform var(--t), opacity var(--t), width var(--t);
}
.header__burger span:last-child { width: 60%; margin-left: auto; }
.header__burger.is-open span:first-child { transform: rotate(45deg) translate(4px, 4px); }
.header__burger.is-open span:last-child  { transform: rotate(-45deg) translate(4px, -4px); width: 100%; }

/* ============================================================
   NAV DRAWER (mobile)
   ============================================================ */
.nav-drawer {
  position: fixed;
  inset: 68px 0 0;
  background: var(--paper);
  z-index: 190;
  display: flex;
  flex-direction: column;
  padding: 48px var(--gutter);
  transform: translateX(100%);
  transition: transform 0.4s var(--ease);
}
.nav-drawer.is-open { transform: none; }

.nav-drawer__nav {
  display: flex;
  flex-direction: column;
  gap: 32px;
}
.nav-drawer__link {
  font-family: var(--font-en);
  font-size: 1.8rem;
  font-weight: 300;
  letter-spacing: 0;
  color: var(--ink);
  border-bottom: 1px solid var(--border);
  padding-bottom: 24px;
}

.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(17,17,16,0.3);
  z-index: 180;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t);
}
.nav-overlay.is-visible { opacity: 1; pointer-events: all; }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  padding-top: 68px;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
}

.hero__inner {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
  padding-block: 80px 60px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  width: 100%;
}

.hero__en {
  font-family: var(--font-en);
  font-size: 0.72rem;
  font-weight: 300;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}

.hero__title {
  font-family: var(--font-mincho);
  font-size: clamp(2rem, 3.6vw, 3.6rem);
  font-weight: 300;
  line-height: 1.6;
  letter-spacing: 0.05em;
  margin-bottom: 32px;
  color: var(--ink);
}

.hero__lead {
  font-size: 0.9rem;
  color: var(--ink-mid);
  line-height: 2;
  letter-spacing: 0.05em;
  margin-bottom: 40px;
}

.hero__scroll-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-en);
  font-size: 0.75rem;
  font-weight: 300;
  letter-spacing: 0;
  color: var(--ink-mid);
  transition: color var(--t), gap var(--t);
}
.hero__scroll-link:hover { color: var(--ink); gap: 16px; }

.hero__visual {
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero__visual-inner {
  width: 100%;
  aspect-ratio: 4/3;
  max-width: 480px;
  background: var(--paper-warm);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.hero__slideshow {
  position: absolute;
  inset: 0;
}
.hero__slide {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 0.9s ease;
}
.hero__slide.is-active {
  opacity: 1;
}
.hero__slide-dots {
  position: absolute;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 6px;
  z-index: 2;
}
.hero__dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  transition: background 0.3s;
}
.hero__dot.is-active {
  background: rgba(255,255,255,0.95);
}
.hero__slide--coming-soon {
  filter: grayscale(100%);
  opacity: 0;
}
.hero__slide--coming-soon.is-active {
  opacity: 0.4;
}
.hero__coming-soon-overlay {
  position: absolute;
  inset: 0;
  background: rgba(245,245,243,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.9s ease;
  z-index: 1;
  pointer-events: none;
}
.hero__coming-soon-overlay.is-active {
  opacity: 1;
}
.hero__coming-soon-overlay span {
  font-family: var(--font-en);
  font-size: 0.72rem;
  font-weight: 300;
  letter-spacing: 0.16em;
  color: var(--ink-mid);
  border: 1px solid rgba(51,51,51,0.25);
  padding: 8px 20px;
}

.hero__line {
  position: absolute;
  inset-block-end: 0;
  inset-inline: var(--gutter);
  height: 1px;
  background: var(--border);
}

/* ============================================================
   CONCEPT
   ============================================================ */
.concept {
  padding-block: 120px;
  background: var(--ink);
  color: var(--paper);
}

.concept__inner {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 60px;
  align-items: start;
}
.concept__inner .section-label { color: var(--accent-lt); margin-top: 8px; }

.concept__text {
  font-size: clamp(0.95rem, 1.6vw, 1.15rem);
  font-weight: 300;
  line-height: 2;
  letter-spacing: 0.05em;
  color: rgba(255,255,255,0.8);
  margin-bottom: 24px;
}
.concept__text:last-child { margin-bottom: 0; }

/* ============================================================
   SERVICE
   ============================================================ */
.service { padding-block: 120px; }

.service__inner {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.service__header { margin-bottom: 64px; }

.service__list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.service-item {
  background: var(--paper);
  padding: 48px 44px;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 0;
  transition: background var(--t);
}
.service-item:hover { background: var(--paper-warm); }

.service-item__num {
  font-family: var(--font-en);
  font-size: 0.72rem;
  font-weight: 300;
  letter-spacing: 0.05em;
  color: var(--ink-sub);
  margin-bottom: 20px;
}

.service-item__name {
  font-family: var(--font-en);
  font-size: 1.6rem;
  font-weight: 300;
  letter-spacing: 0;
  margin-bottom: 4px;
  color: var(--ink);
}

.service-item__ja {
  font-size: 0.78rem;
  color: var(--ink-sub);
  letter-spacing: 0.05em;
  margin-bottom: 20px;
}

.service-item__desc {
  font-size: 0.85rem;
  color: var(--ink-mid);
  line-height: 2;
  letter-spacing: 0.05em;
  margin-bottom: 28px;
  flex-grow: 1;
}

.service-item__price {
  font-family: var(--font-en);
  font-size: 1rem;
  font-weight: 300;
  letter-spacing: 0;
  color: var(--accent);
  border-top: 1px solid var(--border);
  padding-top: 20px;
  margin-top: auto;
}

/* ============================================================
   WORKS
   ============================================================ */
.works {
  padding-block: 120px;
  background: var(--paper-warm);
}

.works__inner {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.works__header { margin-bottom: 48px; }

.works__filter {
  display: flex;
  gap: 0;
  margin-bottom: 48px;
  border: 1px solid var(--border);
  width: fit-content;
  background: var(--paper);
}

.filter-btn {
  background: none;
  border: none;
  padding: 10px 24px;
  font-family: var(--font-en);
  font-size: 0.75rem;
  font-weight: 300;
  letter-spacing: 0;
  color: var(--ink-sub);
  cursor: pointer;
  border-right: 1px solid var(--border);
  transition: background var(--t), color var(--t);
}
.filter-btn:last-child { border-right: none; }
.filter-btn:hover { color: var(--ink); background: var(--paper-warm); }
.filter-btn.is-active { background: var(--ink); color: var(--paper); }

.works__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.work-card { overflow: hidden; }
.work-card.is-hidden { display: none; }

/* ---- coming soon ---- */
.work-card--coming-soon .work-card__link { pointer-events: none; cursor: default; }
.work-card--coming-soon .work-card__thumb img { filter: grayscale(100%); opacity: 0.4; }
.work-card--coming-soon:hover .work-card__thumb img { transform: none; }
.work-card--coming-soon .work-card__overlay {
  opacity: 1;
  background: rgba(245,245,243,0.6);
}
.work-card--coming-soon .work-card__overlay span {
  font-family: var(--font-en);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--ink-mid);
  border-color: rgba(51,51,51,0.25);
}

.work-card__link { display: block; }

.work-card__thumb {
  position: relative;
  aspect-ratio: 4/3;
  overflow: hidden;
  background: var(--border);
}
.work-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease);
}
.work-card:hover .work-card__thumb img { transform: scale(1.05); }

.work-card__overlay {
  position: absolute;
  inset: 0;
  background: rgba(17,17,16,0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--t);
}
.work-card:hover .work-card__overlay { opacity: 1; }
.work-card__overlay span {
  font-family: var(--font-en);
  font-size: 0.75rem;
  font-weight: 300;
  letter-spacing: 0.05em;
  color: var(--paper);
  border: 1px solid rgba(255,255,255,0.6);
  padding: 8px 20px;
}

.work-card__info { padding: 16px 0 4px; }

.work-card__tag {
  font-family: var(--font-en);
  font-size: 0.68rem;
  font-weight: 300;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 6px;
}

.work-card__title {
  font-size: 0.9rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
  color: var(--ink);
}

.work-card__client {
  font-size: 0.78rem;
  color: var(--ink-sub);
  letter-spacing: 0;
}

/* works more link */
.works__more {
  margin-top: 56px;
  text-align: center;
}
.works__more-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-en);
  font-size: 0.82rem;
  font-weight: 300;
  letter-spacing: 0.14em;
  color: var(--ink);
  border: 1px solid var(--border);
  padding: 14px 36px;
  background: var(--paper);
  transition: border-color var(--t), gap var(--t), background var(--t);
}
.works__more-link:hover {
  border-color: var(--ink);
  gap: 20px;
}

/* ============================================================
   PROCESS
   ============================================================ */
.process { padding-block: 120px; }

.process__inner {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.process__header { margin-bottom: 64px; }

.process__list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.process__step {
  background: var(--paper);
  padding: 40px 36px;
}

.process__step-num {
  display: block;
  font-family: var(--font-en);
  font-size: 2rem;
  font-weight: 300;
  color: var(--accent);
  letter-spacing: 0;
  margin-bottom: 24px;
  line-height: 1;
}

.process__step h3 {
  font-size: 0.9rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
  color: var(--ink);
}

.process__step p {
  font-size: 0.82rem;
  color: var(--ink-mid);
  line-height: 2;
  letter-spacing: 0.05em;
}

/* ============================================================
   STUDIO
   ============================================================ */
.studio {
  padding-block: 120px;
  background: var(--paper-warm);
}

.studio__inner {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.studio__header { margin-bottom: 64px; }

.studio__body {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 80px;
  align-items: start;
}

.studio__photo {
  position: sticky;
  top: 88px;
}
.studio__photo img {
  width: 100%;
  aspect-ratio: 3/4;
  object-fit: cover;
  background: var(--border);
}

.studio__catch {
  font-size: clamp(1.05rem, 2vw, 1.4rem);
  font-family: var(--font-mincho);
  font-weight: 300;
  letter-spacing: 0.05em;
  line-height: 1.75;
  margin-bottom: 32px;
  color: var(--ink);
}

.studio__desc {
  font-size: 0.88rem;
  color: var(--ink-mid);
  line-height: 2;
  letter-spacing: 0.05em;
  margin-bottom: 20px;
}

.studio__meta {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px 24px;
  margin-top: 40px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
}
.studio__meta dt { color: var(--ink-sub); white-space: nowrap; letter-spacing: 0; }
.studio__meta dd { color: var(--ink-mid); letter-spacing: 0.05em; }

.studio__sns {
  display: flex;
  gap: 16px;
  margin-top: 24px;
}
.studio__sns-link {
  display: flex;
  align-items: center;
  color: var(--ink-sub);
  text-decoration: none;
  opacity: 0.7;
  transition: opacity 0.2s;
}
.studio__sns-link:hover { opacity: 1; }

/* ============================================================
   CONTACT
   ============================================================ */
.contact { padding-block: 120px; }

.contact__inner {
  max-width: 760px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.contact__header { margin-bottom: 16px; }
.contact__lead {
  font-size: 0.88rem;
  color: var(--ink-mid);
  line-height: 2;
  letter-spacing: 0.05em;
  margin-bottom: 56px;
}

.contact-form { display: flex; flex-direction: column; gap: 28px; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-group label {
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--ink-mid);
}
.form-group label em { color: var(--accent); margin-left: 2px; }

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 0;
  padding: 14px 16px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--ink);
  outline: none;
  transition: border-color var(--t), box-shadow var(--t);
  -webkit-appearance: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(184,154,94,0.12);
}
.form-group input.is-error,
.form-group textarea.is-error { border-color: #c0392b; }
.form-group textarea { resize: vertical; }

.form-submit {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  margin-top: 8px;
}

.submit-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--ink);
  color: var(--paper);
  border: none;
  padding: 18px 40px;
  font-family: var(--font-en);
  font-size: 0.82rem;
  font-weight: 300;
  letter-spacing: 0;
  cursor: pointer;
  transition: background var(--t), gap var(--t);
}
.submit-btn:hover { background: var(--ink-mid); gap: 20px; }

.form-note {
  font-size: 0.78rem;
  color: var(--ink-sub);
  letter-spacing: 0.04em;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--ink);
  color: var(--paper);
  padding-block: 60px 40px;
}

.footer__inner {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.footer__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 40px;
  margin-bottom: 40px;
  border-bottom: 1px solid rgba(248,247,244,0.12);
}

.footer__logo {
  font-family: var(--font-en);
  font-size: 1.6rem;
  font-weight: 300;
  letter-spacing: 0.1em;
  color: var(--paper);
  text-decoration: none;
}

.footer__nav {
  display: flex;
  gap: 36px;
}
.footer__nav a {
  font-family: var(--font-en);
  font-size: 0.75rem;
  font-weight: 300;
  letter-spacing: 0;
  color: rgba(255,255,255,0.45);
  transition: color var(--t);
}
.footer__nav a:hover { color: var(--paper); }

.footer__sns {
  display: flex;
  gap: 20px;
  padding: 20px 0;
  border-top: 1px solid rgba(255,255,255,0.08);
  margin-bottom: 20px;
}
.footer__sns-link {
  display: flex;
  align-items: center;
  text-decoration: none;
  opacity: 0.5;
  transition: opacity 0.2s;
}
.footer__sns-link:hover { opacity: 1; }

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.footer__address,
.footer__copy {
  font-family: var(--font-en);
  font-size: 0.7rem;
  font-weight: 300;
  letter-spacing: 0;
  color: rgba(255,255,255,0.3);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 960px) {
  :root { --gutter: 28px; }

  .hero__inner { grid-template-columns: 1fr; gap: 40px; }
  .hero__visual { display: none; }

  .concept__inner { grid-template-columns: 1fr; gap: 24px; }

  .service__list { grid-template-columns: 1fr; }

  .works__grid { grid-template-columns: repeat(2, 1fr); }

  .process__list { grid-template-columns: repeat(2, 1fr); }

  .studio__body { grid-template-columns: 1fr; gap: 40px; }
  .studio__photo { position: static; max-width: 320px; }
  .studio__photo img { aspect-ratio: 4/3; }
}

@media (max-width: 680px) {
  :root { --gutter: 20px; }

  .header__nav { display: none; }
  .header__burger { display: flex; }

  .hero { min-height: auto; padding-top: 68px; }

  .works__grid { grid-template-columns: 1fr; }

  .works__filter { flex-wrap: wrap; }

  .process__list { grid-template-columns: 1fr; }

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

  .footer__top { flex-direction: column; gap: 24px; text-align: center; }
  .footer__bottom { flex-direction: column; gap: 8px; text-align: center; }
}

/* ============================================================
   WORK DETAIL OVERLAY  (SPA)
   ============================================================ */
.work-overlay {
  position: fixed;
  inset: 0;
  z-index: 400;
  background: var(--paper);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  visibility: hidden;
  transform: translateY(40px);
  opacity: 0;
  transition:
    opacity  0.38s cubic-bezier(0.25,0.1,0.25,1),
    transform 0.38s cubic-bezier(0.25,0.1,0.25,1),
    visibility 0s linear 0.38s;
}
.work-overlay.is-open {
  visibility: visible;
  opacity: 1;
  transform: translateY(0);
  transition:
    opacity  0.38s cubic-bezier(0.25,0.1,0.25,1),
    transform 0.38s cubic-bezier(0.25,0.1,0.25,1),
    visibility 0s linear 0s;
}
.work-overlay__inner {
  min-height: 100%;
}