@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=Noto+Serif+JP:wght@300;400;500&display=swap');
@import url('https://cdn.jsdelivr.net/npm/flatpickr/dist/flatpickr.min.css');

:root {
  --bg-color: #050505;
  --text-color: #f0f0f0;
  --text-muted: #888888;
  --border-color: rgba(255, 255, 255, 0.15);
  --accent-color: #ffffff;
  
  --font-sans: 'Inter', sans-serif;
  --font-serif: 'Noto Serif JP', serif;
  
  --header-height: 80px;
}

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

html, body {
  width: 100%;
  min-height: 100vh;
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Architectural Frame */
.arch-frame {
  position: fixed;
  top: 1.5rem;
  left: 1.5rem;
  right: 1.5rem;
  bottom: 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  pointer-events: none;
  z-index: 999;
}

/* Typography */
.jp-serif {
  font-family: var(--font-serif);
  letter-spacing: 0.1em;
}

h1, h2, h3, h4 {
  font-weight: 300;
  letter-spacing: -0.02em;
}

p {
  line-height: 1.8;
  color: var(--text-color);
  font-weight: 300;
}

a {
  color: inherit;
  text-decoration: none;
  transition: opacity 0.3s ease;
}

a:hover {
  opacity: 0.6;
}

/* UI Elements */
.btn-primary {
  display: inline-block;
  background-color: var(--accent-color);
  color: var(--bg-color);
  padding: 1rem 2.5rem;
  font-family: var(--font-sans);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: none;
  cursor: pointer;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.btn-primary:hover {
  background-color: #cccccc;
}

.btn-outline {
  display: inline-block;
  border: 1px solid var(--border-color);
  color: var(--text-color);
  padding: 1rem 2.5rem;
  font-family: var(--font-sans);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: transparent;
  cursor: pointer;
  transition: all 0.3s ease;
}

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

/* Header */
header {
  position: fixed;
  top: 0;
  width: 100%;
  height: var(--header-height);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 3rem;
  z-index: 100;
  mix-blend-mode: difference;
}

.logo {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 3rem;
}

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

.nav-links a {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-weight: 500;
}

.reserve-btn-nav {
  padding: 0.6rem 1.5rem;
  font-size: 0.85rem;
}

/* Fullscreen Sections */
.section-full {
  width: 100vw;
  height: 100vh;
  position: relative;
  overflow: hidden;
}

.hero-section {
  position: relative;
  z-index: 1;
}

.hero-img-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.img-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.0); /* Scaled by JS */
}

.overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.3);
}

/* Hero Content */
.hero-content {
  position: absolute;
  bottom: 12%;
  left: 8%;
  z-index: 2;
}

.hero-title {
  font-size: 4.5rem;
  margin-bottom: 1rem;
  text-shadow: 0 4px 30px rgba(0,0,0,0.6);
  letter-spacing: 0.05em;
}

.hero-subtitle {
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.4em;
  text-transform: uppercase;
}

/* Standard Content Sections */
.section-content {
  padding: 8rem 10%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.section-content.reverse {
  direction: rtl;
}

.section-content.reverse > * {
  direction: ltr;
}

.text-block {
  max-width: 500px;
}

.text-block h2 {
  font-size: 3rem;
  margin-bottom: 2rem;
  line-height: 1.2;
}

.text-block .label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 1rem;
  display: block;
}

.img-block {
  width: 100%;
  height: 70vh;
  overflow: hidden;
}

.img-block img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.1);
}

/* Philosophy Section */
.philosophy {
  text-align: center;
  padding: 12rem 5%;
  position: relative;
  z-index: 10;
  background-color: var(--bg-color); /* Important for sliding over hero */
}

.philosophy h2 {
  font-size: 2.5rem;
  margin-bottom: 4rem;
  line-height: 1.4;
}

.philosophy p {
  font-size: 1.1rem;
  max-width: 700px;
  margin: 0 auto;
  color: var(--text-muted);
  line-height: 2.2;
}

/* Activity Collage */
.activity-collage {
  position: relative;
  width: 100vw;
  padding: 10rem 10%;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-color);
  overflow: hidden;
}

.activity-text {
  max-width: 600px;
  margin-bottom: 6rem;
  z-index: 10;
}

.collage-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3rem;
  width: 100%;
}

.collage-img {
  position: relative;
  width: 100%;
  aspect-ratio: 3/4;
  overflow: hidden;
  background-color: #111;
}

.collage-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.8;
  transition: opacity 0.5s ease;
  transform: scale(1.15); /* internal parallax buffer */
}

/* a5画像の茶碗を中心にするトリミング調整 */
.img-5 img {
  object-position: 20% 100%;
}

.activity-collage:hover .collage-img img {
  opacity: 0.4;
}

.collage-img:hover img {
  opacity: 1 !important;
}

/* Staggered Masonry Effect */
.img-2, .img-5 { margin-top: 5rem; }
.img-3, .img-6 { margin-top: 10rem; }

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background-color: var(--border-color);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.feature-item {
  background-color: var(--bg-color);
  padding: 4rem 2rem;
  text-align: center;
}

.feature-item h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.feature-item p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Reservation Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(10px);
  z-index: 1000;
  display: flex;
  justify-content: flex-end;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.reservation-panel {
  width: 450px;
  height: 100%;
  background: #111111;
  border-left: 1px solid var(--border-color);
  padding: 3rem;
  transform: translateX(100%);
  transition: transform 0.5s cubic-bezier(0.19, 1, 0.22, 1);
  display: flex;
  flex-direction: column;
}

.modal-overlay.active .reservation-panel {
  transform: translateX(0);
}

.close-modal {
  position: absolute;
  top: 2rem;
  right: 2rem;
  background: none;
  border: none;
  color: var(--text-color);
  font-size: 1.5rem;
  cursor: pointer;
}

.res-header {
  margin-bottom: 3rem;
}

.res-header h2 {
  font-size: 2rem;
}

.form-group {
  margin-bottom: 2rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.8rem;
}

.form-group input, .form-group select {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-color);
  font-size: 1.2rem;
  padding: 0.5rem 0;
  font-family: var(--font-sans);
  outline: none;
}

.price-display {
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
  margin-bottom: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.price-val {
  font-size: 2rem;
  font-weight: 300;
}

/* Footer */
footer {
  padding: 6rem 10% 2rem 10%;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-color);
  position: relative;
  z-index: 100;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  margin-bottom: 6rem;
}

.footer-logo {
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: 0.2em;
}

.footer-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem 4rem;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* Responsive */
@media (max-width: 768px) {
  header {
    padding: 0 1.5rem;
  }
  .nav-links {
    display: none;
  }
  .hero-content {
    left: 5%;
    bottom: 10%;
  }
  .hero-title {
    font-size: 2.5rem;
  }
  .section-content {
    grid-template-columns: 1fr;
    padding: 4rem 5%;
    gap: 2rem;
  }
  .section-content.reverse {
    direction: ltr;
  }
  .img-block {
    height: 50vh;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .reservation-panel {
    width: 100%;
  }
  .footer-top {
    flex-direction: column;
    gap: 3rem;
  }
}