/* ============================================================
   Kisaki Calligraphy – Main Stylesheet
   ============================================================ */

@font-face {
  font-family: 'Noto Serif JP';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('fonts/NotoSerifJP-subset.woff2') format('woff2');
  unicode-range: U+3000-9FFF, U+F900-FAFF, U+FF00-FFEF;
}

@font-face {
  font-family: 'Noto Serif JP';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('fonts/NotoSerifJP-subset-bold.woff2') format('woff2');
  unicode-range: U+3000-9FFF, U+F900-FAFF, U+FF00-FFEF;
}

@font-face {
  font-family: 'Noto Serif JP';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('fonts/NotoSerifJP-subset-bold.woff2') format('woff2');
  unicode-range: U+3000-9FFF, U+F900-FAFF, U+FF00-FFEF;
}

:root {
  --ink: #1a1a2e;
  --paper: #e6d4da;
  --accent: #8b1a1a;
  --accent-light: #c0392b;
  --muted: #6b6b6b;
  --border: #d4c9b8;
  --card-bg: #ffffff;
  --shadow: rgba(0, 0, 0, 0.08);
  --radius: 4px;
  --transition: 0.25s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Serif JP', 'Noto Serif CJK JP', 'Hiragino Mincho ProN', 'Yu Mincho', 'MS Mincho', 'Georgia', 'Times New Roman', serif;
  background-color: var(--paper);
  color: var(--ink);
  line-height: 1.7;
  min-height: 100vh;
}

/* ---- Nav ---- */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: 64px;
  background: #000;
  color: #fff;
  backdrop-filter: blur(6px);
  border-bottom: 1px solid #333;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #fff;
  text-decoration: none;
}

.nav-logo span {
  color: var(--accent);
}

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

.nav-links a {
  color: #fff;
  text-decoration: none;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  transition: color var(--transition);
}

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

/* ---- Language switcher ---- */
.lang-switcher {
  display: flex;
  gap: 0.25rem;
  align-items: center;
  background: var(--border);
  border-radius: 20px;
  padding: 3px;
}

.lang-btn {
  border: none;
  background: transparent;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--muted);
  padding: 4px 12px;
  border-radius: 16px;
  transition: background var(--transition), color var(--transition);
}

.lang-btn.active {
  background: var(--card-bg);
  color: var(--accent);
  box-shadow: 0 1px 4px var(--shadow);
}

/* ---- Hero ---- */
.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  text-align: center;
  padding: 0 2rem 4rem;
  gap: 1.2rem;
}

.hero::before {
  content: "";
  display: block;
  width: 100vw;
  height: min(100vh, 112.5vw);
  background-image:
    linear-gradient(to bottom, rgba(249, 245, 238, 0) 72%, var(--paper) 100%),
    url('assets/BG.png');
  background-size: 100% 100%, auto 100%;
  background-position: center center, center center;
  background-repeat: no-repeat, no-repeat;
  margin-bottom: 1rem;
}

.hero-kanji {
  font-size: 5rem;
  color: var(--accent);
  opacity: 0.18;
  font-family: serif;
  line-height: 1;
  letter-spacing: -0.02em;
  user-select: none;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  letter-spacing: 0.12em;
  line-height: 1.1;
  color: var(--ink);
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 520px;
  font-style: italic;
}

.hero-cta {
  display: inline-block;
  margin-top: 0.5rem;
  padding: 0.75rem 2.2rem;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  border-radius: var(--radius);
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  transition: background var(--transition), transform var(--transition);
}

.hero-cta:hover {
  background: var(--accent-light);
  transform: translateY(-2px);
}

/* ---- Sections ---- */
section {
  padding: 5rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
}

.section-title {
  font-size: 1.8rem;
  letter-spacing: 0.1em;
  margin-bottom: 0.4rem;
  color: var(--ink);
}

.section-divider {
  width: 48px;
  height: 2px;
  background: var(--accent);
  margin-bottom: 2.5rem;
}

/* ---- Gallery ---- */
#gallery {
  position: relative;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
  position: relative;
}

@media (max-width: 900px) {
  .gallery-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 600px) {
  .gallery-grid {
    grid-template-columns: 1fr;
  }
}

.artwork-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 8px var(--shadow);
  transition: transform 0.44s cubic-bezier(0.22, 1, 0.36, 1), 
              box-shadow 0.44s cubic-bezier(0.22, 1, 0.36, 1),
              opacity 0.42s cubic-bezier(0.22, 1, 0.36, 1),
              filter 0.42s cubic-bezier(0.22, 1, 0.36, 1);
  cursor: pointer;
  width: 100%;
}

.artwork-card.is-hidden {
  display: none;
}

.artwork-card.is-entering,
.artwork-card.is-collapsing {
  opacity: 0;
  filter: blur(1.2px);
}

.artwork-card.is-entering .artwork-image,
.artwork-card.is-collapsing .artwork-image {
  transform: scale(0.992);
}

.artwork-image {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.5s ease;
  cursor: zoom-in;
}

.artwork-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.12);
}

.artwork-card:hover .artwork-image {
  transform: scale(1.03);
}

.artwork-placeholder {
  width: 100%;
  aspect-ratio: 3/4;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: linear-gradient(145deg, #f0ebe0, #e6ddd0);
  font-size: 3.5rem;
  color: var(--accent);
  opacity: 0.7;
  font-family: serif;
}

.artwork-placeholder .artwork-label {
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--muted);
  opacity: 1;
  font-family: 'Georgia', serif;
  text-transform: uppercase;
}

.artwork-info {
  padding: 1rem;
  border-top: 1px solid var(--border);
}

.artwork-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink);
}

.artwork-meta {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.25rem;
  font-style: italic;
}

#gallery.gallery-collapsed .gallery-grid::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 140px;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0), var(--paper));
  pointer-events: none;
  transition: opacity 0.42s cubic-bezier(0.22, 1, 0.36, 1);
}

.gallery-actions {
  display: flex;
  justify-content: center;
  margin-top: 1.1rem;
}

.gallery-toggle-btn {
  border: 2px solid var(--accent);
  background: linear-gradient(180deg, var(--card-bg) 0%, var(--paper) 100%);
  color: var(--accent);
  font-family: inherit;
  font-size: 0.92rem;
  letter-spacing: 0.04em;
  padding: 0.68rem 1.35rem;
  border-radius: 999px;
  box-shadow: 0 8px 18px var(--shadow);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.gallery-toggle-btn::after {
  content: "↓";
  font-size: 0.95rem;
  line-height: 1;
  transition: transform var(--transition);
}

#gallery:not(.gallery-collapsed) .gallery-toggle-btn::after {
  transform: rotate(180deg);
}

#gallery:not(.gallery-collapsed) .gallery-toggle-btn {
  background: linear-gradient(180deg, var(--paper) 0%, var(--card-bg) 100%);
  border-color: var(--accent-light);
  color: var(--ink);
}

.gallery-toggle-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.12);
  border-color: var(--accent-light);
}

.gallery-next-btn {
  position: fixed;
  right: clamp(1rem, 2.5vw, 2rem);
  bottom: calc(env(safe-area-inset-bottom, 0px) + 1rem);
  width: 52px;
  height: 52px;
  border-radius: 999px;
  border: 2px solid var(--accent);
  background: linear-gradient(180deg, var(--card-bg) 0%, var(--paper) 100%);
  color: var(--accent);
  font-size: 1.45rem;
  line-height: 1;
  cursor: pointer;
  display: grid;
  place-items: center;
  box-shadow: 0 10px 24px var(--shadow);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity var(--transition), transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  z-index: 150;
}

.gallery-next-btn.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}

.gallery-next-btn:hover {
  transform: translateY(-2px);
  border-color: var(--accent-light);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.16);
}

body.lightbox-open .gallery-next-btn {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

/* ---- Lightbox ---- */
body.lightbox-open {
  overflow: hidden;
}

.lightbox-overlay {
  position: fixed;
  inset: 0;
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background: rgba(10, 10, 14, 0.82);
  backdrop-filter: blur(7px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.42s cubic-bezier(0.22, 1, 0.36, 1), visibility 0.42s ease;
}

.lightbox-overlay.open {
  opacity: 1;
  visibility: visible;
}

.lightbox-frame {
  position: relative;
  max-width: min(92vw, 1200px);
  max-height: 90vh;
  transform: scale(0.9) translateY(16px);
  opacity: 0;
  transition: transform 0.5s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.44s ease;
}

.lightbox-overlay.open .lightbox-frame {
  transform: scale(1) translateY(0);
  opacity: 1;
}

.lightbox-image {
  display: block;
  max-width: 100%;
  max-height: 90vh;
  object-fit: contain;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 46px;
  height: 46px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.35);
  color: #fff;
  font-size: 2rem;
  line-height: 1;
  cursor: pointer;
  display: grid;
  place-items: center;
  backdrop-filter: blur(4px);
  transition: transform 0.25s ease, background 0.25s ease, border-color 0.25s ease;
}

.lightbox-prev {
  left: -68px;
}

.lightbox-next {
  right: -68px;
}

.lightbox-nav:hover {
  background: rgba(0, 0, 0, 0.65);
  border-color: rgba(255, 255, 255, 0.8);
  transform: translateY(-50%) scale(1.05);
}

@media (max-width: 600px) {
  .gallery-next-btn {
    width: 46px;
    height: 46px;
    font-size: 1.25rem;
  }

  .lightbox-overlay {
    padding: 1rem;
  }

  .lightbox-nav {
    width: 40px;
    height: 40px;
    font-size: 1.7rem;
  }

  .lightbox-prev {
    left: 8px;
  }

  .lightbox-next {
    right: 8px;
  }
}

/* ---- About ---- */
.about-inner {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 3rem;
  align-items: start;
}

.about-portrait {
  width: 100%;
  aspect-ratio: 1/1;
  border-radius: 50%;
  background: linear-gradient(145deg, #e0d8cc, #cfc4b2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: var(--accent);
  border: 3px solid var(--border);
  opacity: 0.8;
}

.about-text p {
  margin-bottom: 1rem;
  color: var(--ink);
  font-size: 1rem;
}

.about-description {
  white-space: pre-line;
}

.about-signature {
  margin-top: 1.5rem;
  font-size: 1.8rem;
  color: var(--accent);
  font-style: italic;
  font-family: 'Georgia', cursive;
}

/* ---- Contact ---- */
.contact-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1rem;
  color: var(--ink);
}

.contact-item a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

.contact-item a:hover {
  color: var(--accent-light);
  text-decoration: underline;
}

.contact-icon {
  font-size: 1.2rem;
  width: 1.5rem;
  text-align: center;
}

/* ---- Footer ---- */
footer {
  text-align: center;
  padding: 2rem 1rem;
  border-top: 1px solid #333;
  background-color: #000;
  color: #fff;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
}

footer a {
  color: #fff;
  text-decoration: none;
  transition: color var(--transition);
  display: inline-block;
  margin-bottom: 1rem;
}

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

/* ---- Responsive ---- */
@media (max-width: 700px) {
  .nav-links {
    display: none;
  }

  .about-inner {
    grid-template-columns: 1fr;
  }

  .about-portrait {
    width: 120px;
    height: 120px;
    font-size: 2.5rem;
    margin: 0 auto;
  }
}