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

:root {
  --black: #0a0a0a;
  --dark: #141414;
  --dark-gray: #1e1e1e;
  --mid-gray: #2a2a2a;
  --text-gray: #999;
  --text-light: #ccc;
  --white: #f0f0f0;
  --accent: #c8a87e;
  --font-serif: 'Cormorant Garamond', 'Georgia', serif;
  --font-sans: 'Noto Sans JP', 'Helvetica Neue', sans-serif;
}

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

body {
  background-color: var(--black);
  color: var(--text-light);
  font-family: var(--font-sans);
  font-weight: 300;
  line-height: 1.8;
  overflow-x: hidden;
}

a {
  color: var(--white);
  text-decoration: none;
  transition: color 0.3s;
}

a:hover {
  color: var(--accent);
}

img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ========== Header ========== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: linear-gradient(to bottom, rgba(10, 10, 10, 0.9), transparent);
  padding: 1.5rem 2rem;
  transition: background 0.3s;
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 300;
  letter-spacing: 0.15em;
  color: var(--white);
}

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

.nav a {
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-gray);
  position: relative;
}

.nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width 0.3s;
}

.nav a:hover {
  color: var(--white);
}

.nav a:hover::after {
  width: 100%;
}

/* Hamburger */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 1px;
  background: var(--white);
  transition: transform 0.3s, opacity 0.3s;
}

.menu-toggle.active span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.menu-toggle.active span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ========== Hero ========== */
.hero {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 600px;
  overflow: hidden;
}

.hero-slideshow {
  position: absolute;
  inset: 0;
}

.hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 1.5s ease, transform 6s ease;
  transform: scale(1.05);
}

.hero-slide.active {
  opacity: 1;
  transform: scale(1);
}

.hero-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(10, 10, 10, 0.3) 0%,
    rgba(10, 10, 10, 0.1) 40%,
    rgba(10, 10, 10, 0.6) 80%,
    rgba(10, 10, 10, 1) 100%
  );
}

.hero-content {
  position: absolute;
  bottom: 15%;
  left: 8%;
  z-index: 2;
}

.hero-subtitle {
  font-family: var(--font-serif);
  font-size: 0.9rem;
  font-weight: 300;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--text-gray);
  margin-bottom: 1rem;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: 0.05em;
  color: var(--white);
}

.hero-tagline {
  margin-top: 1.5rem;
  font-size: 0.85rem;
  font-weight: 200;
  letter-spacing: 0.4em;
  color: var(--text-gray);
}

.hero-scroll {
  position: absolute;
  bottom: 2rem;
  right: 3rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  z-index: 2;
}

.hero-scroll span {
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-gray);
  writing-mode: vertical-rl;
}

.scroll-line {
  width: 1px;
  height: 60px;
  background: var(--text-gray);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 1; transform: scaleY(1); }
  50% { opacity: 0.3; transform: scaleY(0.5); }
}

/* ========== Sections Common ========== */
.section {
  padding: 8rem 2rem;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 300;
  letter-spacing: 0.15em;
  text-align: center;
  margin-bottom: 1rem;
  color: var(--white);
}

.section-description {
  text-align: center;
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  color: var(--text-gray);
  margin-bottom: 4rem;
}

/* ========== Concept ========== */
.concept {
  background: var(--dark);
}

.concept-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  margin-top: 4rem;
}

.concept-image {
  aspect-ratio: 3 / 4;
  overflow: hidden;
}

.concept-image img {
  object-position: center top;
}

.concept-lead {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 300;
  line-height: 2;
  margin-bottom: 2rem;
  color: var(--white);
}

.concept-text p {
  font-size: 0.9rem;
  line-height: 2.2;
  color: var(--text-gray);
  margin-bottom: 1.5rem;
}

/* ========== Service ========== */
.service {
  background: var(--black);
}

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

.service-card {
  background: var(--dark);
  padding: 3rem 2.5rem;
  transition: background 0.4s;
}

.service-card:hover {
  background: var(--dark-gray);
}

.service-number {
  font-family: var(--font-serif);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  color: var(--accent);
  display: block;
  margin-bottom: 1.5rem;
}

.service-name {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--white);
  margin-bottom: 1rem;
}

.service-detail {
  font-size: 0.8rem;
  line-height: 2;
  color: var(--text-gray);
}

/* ========== Gallery ========== */
.genre-section:nth-child(even) {
  background: var(--dark);
}

/* --- Masonry Columns (PC) - 写真を切り抜かず原寸比で表示 --- */
.gallery-3col {
  columns: 3;
  column-gap: 6px;
}

.gallery-item {
  break-inside: avoid;
  margin-bottom: 6px;
  overflow: hidden;
  background: var(--mid-gray);
}

.gallery-item img {
  width: 100%;
  height: auto;
  object-fit: contain;
  display: block;
  transition: transform 0.5s ease, filter 0.5s ease;
  filter: brightness(0.85);
}

.gallery-item:hover img {
  transform: scale(1.04);
  filter: brightness(1);
}

/* ========== Video ========== */
.video-section {
  background: var(--dark);
}

.video-thumb {
  display: block;
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  overflow: hidden;
  border-radius: 2px;
}

.video-thumb img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.5s ease, filter 0.5s ease;
  filter: brightness(0.7);
}

.video-thumb:hover img {
  transform: scale(1.03);
  filter: brightness(0.85);
}

.video-play {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  transition: transform 0.3s ease, opacity 0.3s ease;
  opacity: 0.9;
}

.video-thumb:hover .video-play {
  transform: translate(-50%, -50%) scale(1.1);
  opacity: 1;
}

.video-label {
  position: absolute;
  bottom: 1.5rem;
  right: 1.5rem;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  color: var(--text-gray);
  transition: color 0.3s;
}

.video-thumb:hover .video-label {
  color: var(--white);
}

/* ========== Contact ========== */
.contact {
  background: var(--dark);
  text-align: center;
}

.contact-lead {
  font-size: 0.9rem;
  color: var(--text-gray);
  margin-bottom: 3rem;
  letter-spacing: 0.05em;
}

.contact-info {
  display: flex;
  justify-content: center;
  gap: 4rem;
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.contact-label {
  font-family: var(--font-serif);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-gray);
}

.contact-item a {
  font-size: 1.1rem;
  letter-spacing: 0.08em;
  color: var(--white);
  border-bottom: 1px solid var(--mid-gray);
  padding-bottom: 0.25rem;
  transition: border-color 0.3s, color 0.3s;
}

.contact-item a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* ========== Footer ========== */
.footer {
  padding: 2rem;
  text-align: center;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--text-gray);
  border-top: 1px solid var(--mid-gray);
}

/* ========== Gallery Page ========== */
.header--solid {
  background: rgba(10, 10, 10, 0.95);
}

.nav-active {
  color: var(--white) !important;
}

.nav-active::after {
  width: 100% !important;
}

.gallery-page {
  padding-top: 80px;
}

.gallery-page-header {
  padding: 4rem 2rem 2rem;
  text-align: center;
}

.masonry {
  columns: 4;
  column-gap: 6px;
  padding: 0 6px 6px;
}

.masonry-item {
  break-inside: avoid;
  margin-bottom: 6px;
  overflow: hidden;
  cursor: pointer;
}

.masonry-item img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.5s ease, filter 0.5s ease;
  filter: brightness(0.85);
}

.masonry-item:hover img {
  transform: scale(1.04);
  filter: brightness(1);
}

/* ========== Lightbox ========== */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0, 0, 0, 0.95);
  align-items: center;
  justify-content: center;
}

.lightbox.open {
  display: flex;
}

.lightbox-content {
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-content img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  width: auto;
  height: auto;
}

.lightbox-close {
  position: absolute;
  top: 1.5rem;
  right: 2rem;
  background: none;
  border: none;
  color: var(--white);
  font-size: 2.5rem;
  cursor: pointer;
  z-index: 2001;
  line-height: 1;
  transition: color 0.3s;
}

.lightbox-close:hover {
  color: var(--accent);
}

.lightbox-prev,
.lightbox-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-gray);
  font-size: 3rem;
  cursor: pointer;
  padding: 1rem;
  z-index: 2001;
  transition: color 0.3s;
}

.lightbox-prev:hover,
.lightbox-next:hover {
  color: var(--white);
}

.lightbox-prev {
  left: 1rem;
}

.lightbox-next {
  right: 1rem;
}

/* ========== Fade-in Animation ========== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.gallery-item.fade-in {
  transition-delay: calc(var(--i, 0) * 0.1s);
}

.gallery-item:nth-child(1) { --i: 0; }
.gallery-item:nth-child(2) { --i: 1; }
.gallery-item:nth-child(3) { --i: 2; }
.gallery-item:nth-child(4) { --i: 3; }
.gallery-item:nth-child(5) { --i: 4; }
.gallery-item:nth-child(6) { --i: 5; }

/* ========== Responsive ========== */
@media (max-width: 768px) {
  /* Header */
  .menu-toggle {
    display: flex;
  }

  .nav {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    height: 100vh;
    background: rgba(10, 10, 10, 0.97);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s, visibility 0.4s;
  }

  .nav.open {
    opacity: 1;
    visibility: visible;
  }

  .nav ul {
    flex-direction: column;
    align-items: center;
    gap: 2.5rem;
  }

  .nav a {
    font-size: 1rem;
  }

  /* Hero */
  .hero-content {
    bottom: 20%;
    left: 6%;
  }

  .hero-tagline {
    letter-spacing: 0.2em;
  }

  .hero-scroll {
    right: 1.5rem;
  }

  /* Sections */
  .section {
    padding: 5rem 1.2rem;
  }

  /* Concept */
  .concept-body {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .concept-image {
    aspect-ratio: 4 / 3;
  }

  .concept-lead {
    font-size: 1.2rem;
  }

  .concept-text p {
    font-size: 0.85rem;
  }

  /* Masonry */
  .masonry {
    columns: 3;
  }

  /* Service */
  .service-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .service-card {
    padding: 2rem 1.5rem;
  }

  /* Gallery */
  .gallery-3col {
    columns: 2;
    column-gap: 4px;
  }

  .gallery-item {
    margin-bottom: 4px;
  }

  /* Contact */
  .contact-info {
    flex-direction: column;
    gap: 2rem;
  }
}

@media (max-width: 480px) {
  .header {
    padding: 1rem 1.2rem;
  }

  .logo {
    font-size: 1.1rem;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .masonry {
    columns: 2;
  }

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

  .gallery-3col {
    columns: 2;
  }

  .lightbox-prev,
  .lightbox-next {
    font-size: 2rem;
    padding: 0.5rem;
  }
}