/* =============================================
   PORTFOLIO — style.css
   Typeface: EB Garamond (serif) + DM Mono
   Palette: Off-white base, charcoal ink, warm accent
   ============================================= */

:root {
  --bg:         #f5f3ef;
  --ink:        #1a1a18;
  --ink-light:  #6b6b67;
  --accent:     #b5966b;
  --border:     #d8d4cc;
  --white:      #ffffff;
  --serif:      'EB Garamond', Georgia, serif;
  --mono:       'DM Mono', 'Courier New', monospace;
  --nav-h:      56px;
  --max-w:      960px;
  --transition: 0.25s ease;
}

/* ---- RESET ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: inherit; text-decoration: none; }
img { display: block; width: 100%; height: 100%; object-fit: cover; }
ul { list-style: none; }

/* ---- NAV ---- */
#nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.nav-name {
  font-family: var(--serif);
  font-size: 1rem;
  letter-spacing: 0.01em;
}
.nav-links {
  display: flex;
  gap: 2rem;
}
.nav-links a {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-light);
  transition: color var(--transition);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--ink);
}
.nav-links a.active {
  border-bottom: 1px solid var(--ink);
}

/* Language toggle */
.lang-toggle {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  background: none;
  border: 1px solid var(--border);
  padding: 0.25rem 0.65rem;
  cursor: pointer;
  color: var(--ink-light);
  transition: all var(--transition);
  margin-left: 1.5rem;
}
.lang-toggle:hover,
.lang-toggle.ja-active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--bg);
}

/* Japanese font override */
:lang(ja), .lang-ja {
  font-family: 'Noto Serif JP', 'EB Garamond', serif;
}
body.ja .bio p,
body.ja .page-desc,
body.ja .project-desc p,
body.ja .research-abstract,
body.ja .subtitle {
  font-family: 'Noto Serif JP', serif;
  font-size: 0.95rem;
  line-height: 2;
}
body.ja .nav-links a,
body.ja .strip-item span,
body.ja .project-info,
body.ja .strip-label,
body.ja .research-year,
body.ja .photo-caption,
body.ja .series-btn,
body.ja .lang-toggle,
body.ja .project-tags li {
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

/* ---- FOOTER ---- */
footer {
  margin-top: auto;
  padding: 2rem;
  border-top: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--ink-light);
}

/* ============================
   ABOUT / INDEX PAGE
   ============================ */
.about-layout {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 5rem 2rem 3rem;
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 4rem;
  align-items: start;
  flex: 1;
}
.page-title {
  font-family: var(--serif);
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin-bottom: 0.4rem;
}
.subtitle {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-light);
  margin-bottom: 2.5rem;
}
.bio p {
  font-size: 1.05rem;
  margin-bottom: 1.2em;
  color: var(--ink);
  max-width: 54ch;
}
.contact-line {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 2.5rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
}
.contact-line a {
  border-bottom: 1px solid var(--border);
  padding-bottom: 1px;
  transition: border-color var(--transition);
}
.contact-line a:hover { border-color: var(--ink); }
.sep { color: var(--ink-light); }

/* Profile photo */
.about-image { position: relative; }
.photo-placeholder {
  width: 100%;
  aspect-ratio: 3/4;
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--ink-light);
  letter-spacing: 0.1em;
}

/* Selected strip */
.selected-strip {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 3rem 2rem 5rem;
  width: 100%;
}
.strip-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-light);
  margin-bottom: 1.5rem;
}
.strip-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.strip-item {
  display: block;
}
.strip-item span {
  display: block;
  margin-top: 0.6rem;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--ink-light);
  transition: color var(--transition);
}
.strip-item:hover span { color: var(--ink); }
.strip-thumb {
  width: 100%;
  aspect-ratio: 4/3;
  background: var(--border);
  transition: opacity var(--transition);
}
.strip-item:hover .strip-thumb { opacity: 0.8; }

/* ============================
   SHARED PAGE LAYOUT
   ============================ */
.page-main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 4rem 2rem 6rem;
  width: 100%;
  flex: 1;
}
.page-header {
  margin-bottom: 4rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 2rem;
}
.page-header h1 {
  font-family: var(--serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400;
  letter-spacing: -0.01em;
  margin-bottom: 0.8rem;
}
.page-desc {
  font-size: 0.95rem;
  color: var(--ink-light);
  max-width: 56ch;
  line-height: 1.6;
}

/* ============================
   ARCHITECTURE PAGE
   ============================ */
.project-list {
  display: flex;
  flex-direction: column;
  gap: 5rem;
}
.project-item {
  animation: fadeUp 0.5s ease both;
}
.project-meta {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}
.project-num {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--ink-light);
  letter-spacing: 0.06em;
  padding-top: 0.3rem;
  min-width: 2rem;
}
.project-title {
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 400;
  margin-bottom: 0.2rem;
}
.project-info {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--ink-light);
  text-transform: uppercase;
}
.project-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}
.project-image-wrap { width: 100%; }
.img-placeholder {
  width: 100%;
  aspect-ratio: 4/3;
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--ink-light);
  letter-spacing: 0.1em;
}
.project-desc p {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--ink);
  margin-bottom: 1.2rem;
}
.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.8rem;
}
.project-tags li {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--border);
  padding: 0.2rem 0.6rem;
  color: var(--ink-light);
}

/* ============================
   RESEARCH PAGE
   ============================ */
.research-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.research-item {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 2rem;
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--border);
  animation: fadeUp 0.5s ease both;
}
.research-year {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-light);
  letter-spacing: 0.06em;
  padding-top: 0.2rem;
}
.research-title {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 400;
  margin-bottom: 0.3rem;
}
.research-venue {
  font-size: 0.85rem;
  color: var(--ink-light);
  margin-bottom: 1rem;
}
.research-abstract {
  font-size: 0.92rem;
  line-height: 1.75;
  max-width: 60ch;
  margin-bottom: 1rem;
}
.research-links {
  display: flex;
  gap: 1rem;
  margin-bottom: 0.8rem;
}
.research-links a {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--accent);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}
.research-links a:hover { border-color: var(--accent); }

/* ============================
   PHOTOGRAPHY PAGE
   ============================ */
.photo-main { max-width: 1100px; }

.series-nav {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}
.series-btn {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: none;
  border: 1px solid var(--border);
  padding: 0.35rem 0.9rem;
  cursor: pointer;
  color: var(--ink-light);
  transition: all var(--transition);
}
.series-btn:hover,
.series-btn.active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--bg);
}

.photo-grid {
  columns: 3;
  column-gap: 1.2rem;
}
.photo-cell {
  break-inside: avoid;
  margin-bottom: 1.2rem;
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.photo-cell.hidden-cell {
  display: none;
}
.photo-placeholder {
  width: 100%;
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--ink-light);
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: opacity var(--transition);
  aspect-ratio: 3/2;
}
.photo-placeholder.tall { aspect-ratio: 2/3; }
.photo-placeholder.wide { aspect-ratio: 16/9; }
.photo-placeholder:hover { opacity: 0.75; }
.photo-caption {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  color: var(--ink-light);
  margin-top: 0.4rem;
}

/* LIGHTBOX */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(26,26,24,0.95);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
}
.lightbox.hidden { display: none; }
.lb-image-wrap {
  max-width: 80vw;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.lb-image-wrap img {
  max-height: 80vh;
  width: auto;
  max-width: 80vw;
  object-fit: contain;
}
.lb-caption {
  color: rgba(255,255,255,0.5);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  margin-top: 1rem;
  text-align: center;
}
.lb-close, .lb-prev, .lb-next {
  background: none;
  border: none;
  color: rgba(255,255,255,0.6);
  font-family: var(--mono);
  font-size: 1.2rem;
  cursor: pointer;
  transition: color var(--transition);
  padding: 0.5rem;
}
.lb-close { position: absolute; top: 1.5rem; right: 2rem; font-size: 1rem; }
.lb-close:hover, .lb-prev:hover, .lb-next:hover { color: #fff; }

/* ============================
   ANIMATIONS
   ============================ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
.project-item:nth-child(1) { animation-delay: 0.05s; }
.project-item:nth-child(2) { animation-delay: 0.12s; }
.project-item:nth-child(3) { animation-delay: 0.19s; }
.research-item:nth-child(1) { animation-delay: 0.05s; }
.research-item:nth-child(2) { animation-delay: 0.12s; }
.research-item:nth-child(3) { animation-delay: 0.19s; }

/* ============================
   RESPONSIVE
   ============================ */
@media (max-width: 768px) {
  .about-layout {
    grid-template-columns: 1fr;
    padding-top: 3rem;
  }
  .about-image { order: -1; max-width: 260px; }
  .strip-grid { grid-template-columns: 1fr; }
  .project-body { grid-template-columns: 1fr; }
  .research-item { grid-template-columns: 1fr; gap: 0.5rem; }
  .research-year { padding-bottom: 0; }
  .photo-grid { columns: 2; }
  .nav-links { gap: 1.2rem; }
}
@media (max-width: 480px) {
  #nav { padding: 0 1rem; }
  .nav-name { display: none; }
  .photo-grid { columns: 1; }
  .page-main, .about-layout, .selected-strip { padding-left: 1rem; padding-right: 1rem; }
}