/* =============================================
   光翊設計 | GUANGYI DESIGN — style.css
   Aesthetic: Refined minimal, editorial white
   ============================================= */

:root {
  --white: #ffffff;
  --off-white: #f8f7f5;
  --light: #f0eeea;
  --mid: #d0ccc4;
  --dark-mid: #888076;
  --dark: #2a2622;
  --black: #0f0d0b;
  --accent: #b8a898;
  --accent-dark: #8a7060;

  --font-display: 'Cormorant Garamond', 'Noto Serif TC', serif;
  --font-body: 'Noto Sans TC', 'Noto Serif TC', sans-serif;

  --nav-h: 64px;
  --trans: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --trans-fast: 0.2s ease;
}

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

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

body {
  background: var(--white);
  color: var(--dark);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.7;
  overflow-x: hidden;
}

/* Language toggle logic */
body.lang-en .t-zh { display: none !important; }
body.lang-zh .t-en { display: none !important; }
body:not(.lang-en):not(.lang-zh) .t-en { display: none; }

/* =============================================
   NAVBAR
   ============================================= */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  z-index: 100;
  transition: background var(--trans), box-shadow var(--trans);
}

.navbar.scrolled {
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  box-shadow: 0 1px 0 var(--light);
}

.nav-logo {
  text-decoration: none;
  color: var(--dark);
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0.1em;
  display: flex;
  align-items: center;
  gap: 2px;
}
.logo-zh { font-weight: 600; }
.logo-sep { color: var(--accent); margin: 0 4px; }
.logo-en { font-weight: 300; font-style: italic; font-size: 0.95rem; letter-spacing: 0.15em; }

.nav-right {
  display: flex;
  align-items: center;
  gap: 24px;
}

.lang-toggle {
  background: none;
  border: 1px solid var(--mid);
  border-radius: 20px;
  padding: 4px 14px;
  font-family: var(--font-body);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--dark-mid);
  cursor: pointer;
  transition: all var(--trans-fast);
  display: flex;
  gap: 4px;
}
.lang-toggle:hover {
  border-color: var(--dark);
  color: var(--dark);
}
.lang-toggle .lang-sep { color: var(--mid); }

.hamburger {
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--dark);
  transition: all var(--trans);
}
.hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* =============================================
   MENU OVERLAY
   ============================================= */
.menu-overlay {
  position: fixed;
  inset: 0;
  background: var(--white);
  z-index: 99;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 80px 60px;
  transform: translateX(100%);
  transition: transform 0.5s cubic-bezier(0.77, 0, 0.175, 1);
}
.menu-overlay.open { transform: translateX(0); }

.menu-close {
  position: absolute;
  top: 20px; right: 36px;
  background: none;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  color: var(--dark-mid);
  transition: color var(--trans-fast);
}
.menu-close:hover { color: var(--dark); }

.menu-nav { display: flex; flex-direction: column; gap: 8px; }

.menu-link {
  text-decoration: none;
  color: var(--dark);
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 300;
  display: flex;
  align-items: baseline;
  gap: 20px;
  line-height: 1.15;
  transition: color var(--trans);
  position: relative;
  overflow: hidden;
}
.menu-link::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 1px;
  background: var(--accent-dark);
  transition: width var(--trans);
}
.menu-link:hover { color: var(--accent-dark); }
.menu-link:hover::after { width: 100%; }

.menu-num {
  font-size: 0.85rem;
  font-family: var(--font-body);
  color: var(--accent);
  letter-spacing: 0.1em;
  font-weight: 300;
  margin-top: 8px;
}

/* =============================================
   HERO
   ============================================= */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--nav-h) + 60px) 40px 80px;
  position: relative;
  background: var(--white);
}

.hero-content {
  text-align: center;
  max-width: 800px;
  animation: fadeUp 1s ease both;
}

.hero-tagline {
  font-size: 0.8rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--accent-dark);
  margin-bottom: 24px;
  font-family: var(--font-body);
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 300;
  line-height: 1.05;
  margin-bottom: 20px;
}
.hero-zh {
  display: block;
  font-size: clamp(3.5rem, 10vw, 8rem);
  letter-spacing: 0.05em;
  color: var(--dark);
}
.hero-en {
  display: block;
  font-style: italic;
  font-size: clamp(1rem, 3vw, 2rem);
  letter-spacing: 0.3em;
  color: var(--accent-dark);
  margin-top: 8px;
}

.hero-sub {
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  color: var(--dark-mid);
  margin-bottom: 48px;
  font-family: var(--font-body);
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  padding: 13px 32px;
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-family: var(--font-body);
  transition: all var(--trans);
  border: 1px solid var(--dark);
  color: var(--white);
  background: var(--dark);
}
.cta-btn:hover {
  background: var(--black);
  border-color: var(--black);
}
.cta-btn--ghost {
  background: transparent;
  color: var(--dark);
}
.cta-btn--ghost:hover {
  background: var(--dark);
  color: var(--white);
}

.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  animation: fadeIn 2s ease 1s both;
}
.scroll-line {
  width: 1px;
  height: 40px;
  background: var(--mid);
  animation: scrollAnim 2s ease-in-out infinite;
}
.scroll-label {
  font-size: 0.6rem;
  letter-spacing: 0.25em;
  color: var(--mid);
}

/* =============================================
   SECTION COMMON
   ============================================= */
.section-label {
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--accent-dark);
  margin-bottom: 40px;
  text-align: center;
  font-family: var(--font-body);
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
  padding: 0 40px;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2rem, 5vw, 3.5rem);
  color: var(--dark);
  letter-spacing: 0.05em;
  position: relative;
  display: inline-block;
}
.section-title::after {
  content: '';
  display: block;
  width: 40px;
  height: 1px;
  background: var(--accent);
  margin: 12px auto 0;
}

/* =============================================
   SLIDESHOW
   ============================================= */
.slideshow-section {
  padding: 80px 0 60px;
  background: var(--off-white);
  overflow: hidden;
}

.slideshow-wrap {
  position: relative;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 60px;
}

.slideshow-track {
  position: relative;
  width: 100%;
  aspect-ratio: 16/7;
  overflow: hidden;
  background: var(--light);
}

.slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.8s ease;
  cursor: pointer;
}
.slide.active { opacity: 1; }

.slide img, .slide video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.slide-caption {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 40px 32px 24px;
  background: linear-gradient(to top, rgba(15,13,11,0.7) 0%, transparent 100%);
  color: white;
}
.slide-cap-cat {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  opacity: 0.8;
  font-family: var(--font-body);
}
.slide-cap-title {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 300;
  margin-top: 4px;
}

.slide-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  flex-direction: column;
  gap: 8px;
  color: var(--dark-mid);
  font-size: 0.9rem;
  letter-spacing: 0.1em;
}

.slide-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255,255,255,0.9);
  border: none;
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  color: var(--dark);
  transition: all var(--trans-fast);
  z-index: 2;
}
.slide-arrow:hover { background: var(--white); }
.slide-prev { left: 10px; }
.slide-next { right: 10px; }

.slide-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 20px;
}
.slide-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--mid);
  cursor: pointer;
  transition: all var(--trans-fast);
  border: none;
}
.slide-dot.active { background: var(--dark); width: 20px; border-radius: 3px; }

/* =============================================
   WORKS / FILTER
   ============================================= */
.works-section {
  padding: 80px 40px;
  max-width: 1300px;
  margin: 0 auto;
}

.filter-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 48px;
}

.filter-btn {
  background: none;
  border: 1px solid var(--mid);
  padding: 8px 22px;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--dark-mid);
  cursor: pointer;
  transition: all var(--trans-fast);
  font-family: var(--font-body);
}
.filter-btn:hover, .filter-btn.active {
  background: var(--dark);
  border-color: var(--dark);
  color: var(--white);
}

/* GRID */
.works-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2px;
}

.work-card {
  position: relative;
  aspect-ratio: 4/3;
  overflow: hidden;
  cursor: pointer;
  background: var(--light);
  /* animation class applied by JS */
}
.work-card.hidden { display: none; }
.work-card.visible { display: block; }

.work-card img,
.work-card .work-thumb-video {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.work-card:hover img,
.work-card:hover .work-thumb-video { transform: scale(1.04); }

.work-card-overlay {
  position: absolute;
  inset: 0;
  background: rgba(15,13,11,0);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 20px;
  transition: background var(--trans);
}
.work-card:hover .work-card-overlay { background: rgba(15,13,11,0.55); }

.work-card-info {
  transform: translateY(8px);
  opacity: 0;
  transition: all var(--trans);
  color: white;
}
.work-card:hover .work-card-info { transform: translateY(0); opacity: 1; }

.work-card-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 400;
}
.work-card-cat {
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  opacity: 0.75;
  margin-top: 4px;
}

.work-video-badge {
  position: absolute;
  top: 12px; right: 12px;
  background: rgba(255,255,255,0.9);
  padding: 3px 8px;
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--dark);
}

.works-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 80px 20px;
  color: var(--dark-mid);
  display: flex;
  flex-direction: column;
  gap: 6px;
  letter-spacing: 0.1em;
}

/* Card appear animation */
@keyframes cardIn {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
.work-card { animation: cardIn 0.5s ease both; }

/* =============================================
   ABOUT
   ============================================= */
.about-section {
  padding: 80px 40px;
  background: var(--off-white);
}

.about-body {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--dark);
}

.placeholder-text {
  color: var(--dark-mid);
  font-style: italic;
  letter-spacing: 0.05em;
}

/* =============================================
   CONTACT
   ============================================= */
.contact-section {
  padding: 80px 40px;
  text-align: center;
}

.contact-links {
  display: flex;
  gap: 32px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 8px;
}

.contact-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--dark);
  transition: color var(--trans-fast);
}
.contact-item:hover { color: var(--accent-dark); }

.contact-icon {
  font-size: 1.5rem;
  width: 52px; height: 52px;
  border: 1px solid var(--mid);
  display: flex; align-items: center; justify-content: center;
  transition: all var(--trans-fast);
}
.contact-item:hover .contact-icon {
  border-color: var(--dark);
  background: var(--dark);
  color: var(--white);
}
.contact-label {
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--dark-mid);
}

/* =============================================
   FOOTER
   ============================================= */
.site-footer {
  padding: 24px 40px;
  text-align: center;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--dark-mid);
  border-top: 1px solid var(--light);
}

/* =============================================
   LIGHTBOX
   ============================================= */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.lightbox.open {
  opacity: 1;
  pointer-events: all;
}

.lb-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15,13,11,0.92);
  cursor: pointer;
}

.lb-panel {
  position: relative;
  z-index: 1;
  background: var(--white);
  width: min(90vw, 1000px);
  max-height: 90vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  transform: translateY(20px);
  transition: transform 0.3s ease;
}
.lightbox.open .lb-panel { transform: translateY(0); }

.lb-close {
  position: absolute;
  top: 12px; right: 16px;
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  color: var(--dark-mid);
  z-index: 2;
  transition: color var(--trans-fast);
}
.lb-close:hover { color: var(--dark); }

.lb-main {
  width: 100%;
  background: var(--dark);
}

.lb-media-wrap {
  width: 100%;
  aspect-ratio: 16/9;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.lb-media-wrap img, .lb-media-wrap video {
  width: 100%; height: 100%;
  object-fit: contain;
}

/* Thumbnail strip */
.lb-thumbs {
  display: flex;
  gap: 4px;
  padding: 8px;
  background: var(--off-white);
  overflow-x: auto;
  scrollbar-width: thin;
}

.lb-thumb {
  flex: 0 0 80px;
  height: 56px;
  overflow: hidden;
  cursor: pointer;
  opacity: 0.55;
  transition: opacity var(--trans-fast);
  border: 2px solid transparent;
  position: relative;
}
.lb-thumb:hover, .lb-thumb.active { opacity: 1; }
.lb-thumb.active { border-color: var(--dark); }
.lb-thumb img, .lb-thumb video {
  width: 100%; height: 100%;
  object-fit: cover;
  pointer-events: none;
}
.lb-thumb-video-icon {
  position: absolute;
  inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
  color: white;
  background: rgba(0,0,0,0.35);
}

/* LB Info */
.lb-info {
  padding: 24px 28px 28px;
}
.lb-info-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}
.lb-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--dark);
}
.lb-cat-tag {
  font-size: 0.68rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  background: var(--light);
  color: var(--dark-mid);
  padding: 4px 12px;
  white-space: nowrap;
}
.lb-desc {
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--dark-mid);
  margin-bottom: 16px;
}
.lb-ext-link {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--accent-dark);
  text-decoration: none;
  border-bottom: 1px solid var(--accent);
  padding-bottom: 2px;
  transition: color var(--trans-fast);
}
.lb-ext-link:hover { color: var(--dark); }
.lb-ext-link.hidden { display: none; }

/* =============================================
   ANIMATIONS
   ============================================= */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes scrollAnim {
  0%   { transform: scaleY(0); transform-origin: top; }
  50%  { transform: scaleY(1); transform-origin: top; }
  51%  { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 768px) {
  .navbar { padding: 0 20px; }
  .hero { padding: calc(var(--nav-h) + 40px) 24px 60px; }
  .hero-cta { flex-direction: column; align-items: center; }
  .cta-btn { width: 220px; justify-content: center; }
  .works-section { padding: 60px 16px; }
  .works-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
  .about-section, .contact-section { padding: 60px 24px; }
  .slideshow-wrap { padding: 0 44px; }
  .slide-arrow { width: 36px; height: 36px; }
  .lb-panel { width: 95vw; }
  .lb-info { padding: 16px 18px 20px; }
  .menu-overlay { padding: 80px 32px; }
}

@media (max-width: 480px) {
  .works-grid { grid-template-columns: 1fr 1fr; gap: 1px; }
  .filter-bar { gap: 6px; }
  .filter-btn { padding: 7px 14px; font-size: 0.72rem; }
}