:root {
  --c-text: #2a2a2a;
  --c-text-mid: #5a5a5a;
  --c-text-light: #6a6a6a;
  --c-text-muted: #9a9a9a;
  --c-bg: #FFFFE4;
  --t-fast: 0.3s ease;
  --t-med: 0.35s ease;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  background: var(--c-bg);
  color: var(--c-text);
  font-size: 1rem;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ===========================
   Shared Patterns
   =========================== */

a { text-decoration: none; color: inherit; }

.name, .nav-links a, .work-toggle, .contact-list a, .archive-sidebar a {
  transition: opacity var(--t-fast), transform var(--t-fast);
}

.name:hover, .nav-links a:hover, .work-toggle:hover, .sub-links a:hover { opacity: 0.5; }

.nav-links a:active, .work-toggle:active { transform: scale(0.97); }

/* ===========================
   Navigation
   =========================== */

nav {
  position: fixed;
  left: 0;
  top: 0;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  padding: 2.5rem 2.5rem 2.5rem;
  padding-top: 3rem;
  z-index: 100;
}

.name {
  margin-bottom: 3rem;
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.nav-item-with-sub {
  display: flex;
  flex-direction: column;
}

.work-toggle {
  all: unset;
  cursor: pointer;
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  display: inline-block;
  width: fit-content;
}

.nav-id {
  display: inline-block;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  font-family: 'SF Mono', 'Fira Code', monospace;
  min-width: 2.5em;
  vertical-align: baseline;
}

.nav-links a {
  display: inline-block;
  width: fit-content;
  font-size: 0.9rem;
  letter-spacing: 0.02em;
}

/* ===========================
   Work Submenu
   =========================== */

.sub-links {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  padding-left: 1.5rem;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.4s ease, opacity var(--t-fast), padding-top 0.4s ease;
}

.sub-links.expanded {
  max-height: 200px;
  opacity: 1;
  padding-top: 1.2rem;
}

.sub-links a {
  font-size: 0.8rem;
  color: var(--c-text-light);
  transform: translateY(-5px);
  transition: transform var(--t-fast), opacity var(--t-fast);
}

.sub-links.expanded a { transform: translateY(0); }

/* ===========================
   Main Content
   =========================== */

main {
  position: absolute;
  inset: 0;
  padding: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  opacity: 0;
  animation: fadeIn 0.6s ease forwards;
}

/* ===========================
   Hero (Homepage)
   =========================== */

.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.8rem;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 300;
  letter-spacing: -0.03em;
}

.subtitle {
  font-size: 1rem;
  color: var(--c-text-light);
  font-weight: 400;
  letter-spacing: 0.04em;
}

.subtitle-detail {
  font-size: 0.85rem;
  color: var(--c-text-muted);
  font-weight: 400;
  letter-spacing: 0.02em;
}

/* ===========================
   Photo Page
   =========================== */

.photo-page {
  position: relative;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding-top: 6rem;
  padding-bottom: 4rem;
  min-height: auto;
}

.photo-tags {
  font-size: 0.75rem;
  color: var(--c-text-muted);
  letter-spacing: 0.08em;
  margin-bottom: 2rem;
}

/* ===========================
   Film Page
   =========================== */

.film-page {
  position: relative;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding-top: 6rem;
  padding-bottom: 4rem;
  min-height: auto;
}

.film-gallery {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  width: 100%;
  max-width: 60rem;
  margin: 0 auto;
  padding: 0 2rem;
}

.film-item {
  display: flex;
  align-items: center;
  gap: 2rem;
  text-decoration: none;
  position: relative;
}

.film-item img {
  width: 28rem;
  flex-shrink: 0;
  display: block;
  object-fit: cover;
  cursor: pointer;
  transition: filter var(--t-fast), box-shadow var(--t-fast);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.film-item:hover img {
  filter: brightness(0.9);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

.film-item::before {
  content: '▶';
  position: absolute;
  top: 50%;
  left: 14rem;
  transform: translate(-50%, -50%);
  font-size: 2.5rem;
  color: rgba(255, 255, 255, 0.9);
  opacity: 0;
  transition: opacity var(--t-fast);
  pointer-events: none;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.film-item:hover::before {
  opacity: 1;
}

.film-info {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.film-title {
  font-size: 0.9rem;
  color: var(--c-text);
  letter-spacing: 0.02em;
}

.film-description {
  font-size: 0.8rem;
  color: var(--c-text-light);
  letter-spacing: 0.02em;
  font-style: italic;
}

.film-footer {
  margin-top: 3rem;
  text-align: center;
}

.film-footer a {
  font-size: 0.9rem;
  color: var(--c-text-light);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: opacity var(--t-fast);
}

.film-footer a:hover {
  opacity: 0.5;
}

/* ===========================
   Tech Page
   =========================== */

.tech-page {
  position: relative;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding-top: 6rem;
  padding-bottom: 4rem;
  min-height: auto;
  gap: 3.5rem;
}

.tech-featured {
  width: 100%;
  max-width: 44rem;
  padding: 0 2rem;
}

.tech-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 2rem 2.2rem;
  border: 1px solid rgba(42, 42, 42, 0.1);
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}

.tech-card:hover {
  border-color: rgba(42, 42, 42, 0.25);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.tech-card--hero {
  padding: 2.5rem 2.5rem;
}

.tech-card-label {
  font-size: 0.65rem;
  color: var(--c-text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.3rem;
}

.tech-card-title {
  font-size: 1.3rem;
  font-weight: 300;
  letter-spacing: -0.02em;
  color: var(--c-text);
}

.tech-card-desc {
  font-size: 0.8rem;
  color: var(--c-text-light);
  line-height: 1.6;
  max-width: 30rem;
}

.tech-card-link {
  font-size: 0.8rem;
  color: var(--c-text-muted);
  letter-spacing: 0.02em;
  margin-top: 0.6rem;
  transition: color var(--t-fast);
}

.tech-card:hover .tech-card-link {
  color: var(--c-text);
}

.tech-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  width: 100%;
  max-width: 44rem;
  padding: 0 2rem;
}

.tech-grid .tech-card-title {
  font-size: 1rem;
}

.tech-library {
  width: 100%;
  max-width: 44rem;
  padding: 0 2rem;
}

.tech-library-heading {
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-text-muted);
  margin-bottom: 1.2rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid rgba(42, 42, 42, 0.08);
}

.tech-library-grid {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.tech-library-item {
  display: grid;
  grid-template-columns: 6rem 1fr 1fr;
  align-items: baseline;
  padding: 0.8rem 0;
  border-bottom: 1px solid rgba(42, 42, 42, 0.05);
  transition: background var(--t-fast);
}

.tech-library-item:hover {
  background: rgba(42, 42, 42, 0.02);
}

.tech-library-tag {
  font-size: 0.65rem;
  color: var(--c-text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.tech-library-name {
  font-size: 0.85rem;
  color: var(--c-text);
  letter-spacing: 0.01em;
}

.tech-library-detail {
  font-size: 0.8rem;
  color: var(--c-text-light);
  text-align: right;
  font-style: italic;
}

/* ===========================
   Archive Sidebar
   =========================== */

.archive-sidebar {
  position: fixed;
  right: 2.5rem;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  text-align: right;
  gap: 0.8rem;
  z-index: 50;
}

.archive-sidebar a {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.6rem;
}

.archive-sidebar a:hover { filter: brightness(0.85); }

.archive-sidebar img {
  height: 3rem;
  width: auto;
  opacity: 0.7;
  transition: opacity var(--t-fast), filter var(--t-fast);
}

.archive-sidebar a:hover img { opacity: 1; }

.archive-label {
  font-size: 0.7rem;
  color: var(--c-text-light);
  letter-spacing: 0.03em;
  line-height: 1.5;
  max-width: 10rem;
}

/* ===========================
   Photo Gallery
   =========================== */

.photo-gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.8rem;
  width: 100%;
  max-width: 64rem;
  margin: 0 auto;
  padding: 0 2rem;
}

.photo-gallery img {
  width: 100%;
  display: block;
  object-fit: cover;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.6s ease, filter var(--t-fast);
}

.photo-gallery img:hover { filter: brightness(0.85); }
.photo-gallery img.visible { opacity: 1; }

/* ===========================
   About Page
   =========================== */

.about-content {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  align-items: center;
  text-align: center;
  width: 100%;
  max-width: 50rem;
  padding: 0 2rem;
}

.about-photo {
  max-width: 50rem;
  width: 100%;
  object-fit: cover;
}

.about-text {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.about-text h2, .contact-list h2 {
  font-size: 1.6rem;
  font-weight: 300;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.about-text p {
  color: var(--c-text-mid);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ===========================
   Contact Page
   =========================== */

.contact-list {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.contact-list a {
  color: var(--c-text-mid);
  display: inline-block;
  width: fit-content;
  font-size: 0.9rem;
  letter-spacing: 0.01em;
}

.contact-list a:hover {
  transform: translateX(0.4rem);
  opacity: 0.5;
}

/* ===========================
   Footer
   =========================== */

footer {
  position: fixed;
  inset: auto 0 0;
  padding: 1.5rem 2.5rem;
  display: flex;
  justify-content: flex-end;
  pointer-events: none;
}

footer span {
  font-size: 0.7rem;
  color: #b0b0a0;
  letter-spacing: 0.03em;
}

/* ===========================
   Animations
   =========================== */

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-out { animation: fadeOut 0.3s ease-out forwards; }
@keyframes fadeOut { to { opacity: 0; } }

/* ===========================
   Lightbox
   =========================== */

.lightbox-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--t-med), visibility var(--t-med);
}

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

.lightbox-img {
  max-width: 85vw;
  max-height: 85vh;
  object-fit: contain;
  cursor: default;
  transform: scale(0.92);
  transition: transform var(--t-med);
  will-change: transform;
}

.lightbox-overlay.active .lightbox-img { transform: scale(1); }

/* ===========================
   Responsive
   =========================== */

@media (max-width: 768px) {
  nav {
    position: relative;
    padding: 2rem 1.5rem;
  }

  .name { margin-bottom: 2rem; }

  main {
    position: relative;
    min-height: auto;
    padding: 2rem 1.5rem 4rem;
  }

  .hero h1 { font-size: 2.2rem; }
  .about-content { padding: 0; }
  .photo-page {
    padding-top: 2rem;
    padding-right: 1.5rem;
  }

  .photo-gallery {
    grid-template-columns: repeat(2, 1fr);
    padding: 0 1rem;
  }

  .film-page {
    padding-top: 2rem;
  }

  .film-gallery {
    padding: 0 1rem;
    gap: 2rem;
  }

  .film-item {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .film-item img {
    width: 100%;
  }

  .film-item::before {
    left: 50%;
  }

  .film-info {
    align-items: center;
  }

  .tech-page {
    padding-top: 2rem;
    gap: 2.5rem;
  }

  .tech-featured,
  .tech-grid,
  .tech-library {
    padding: 0 1rem;
  }

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

  .tech-library-item {
    grid-template-columns: 5rem 1fr;
    gap: 0.3rem;
  }

  .tech-library-detail {
    grid-column: 1 / -1;
    text-align: left;
    padding-left: 5rem;
  }

  .archive-sidebar {
    position: relative;
    right: auto;
    top: auto;
    transform: none;
    align-items: center;
    text-align: center;
    margin-bottom: 2rem;
    padding: 0 1.5rem;
  }

  .archive-sidebar a { align-items: center; }
  .archive-sidebar a:hover { transform: translateY(-2px); }

  footer {
    position: relative;
    padding: 1.5rem;
  }
}