/* ===== Google Fonts ===== */
/* 
   英文字體: Quintessential
   中文字體: LXGW WenKai Mono TC 
*/

:root {
    --font-english: 'Quintessential', cursive;
    --font-chinese: 'LXGW WenKai Mono TC', sans-serif;
}

/* 全站使用中文字體 */
body {
    font-family: var(--font-chinese);
}

/* 標題和導航用英文字體 */
h1, h2, h3, h4, h5, h6, .logo, .nav-link {
    font-family: var(--font-english);
}


/* Portfolio Header */
.portfolio-header {
  padding: 140px 24px 60px;
  text-align: center;
  background: linear-gradient(to bottom, var(--bg-secondary), transparent);
}

.portfolio-header h1 {
  margin-bottom: 16px;
  animation: fadeInUp 0.8s ease-out;
}

.portfolio-header p {
  max-width: 600px;
  margin: 0 auto;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Filter Tabs */
.filter-tabs {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 50px;
  flex-wrap: wrap;
  padding: 0 24px;
}

.filter-tab {
  padding: 14px 32px;
  border: 2px solid rgba(139, 92, 246, 0.3);
  border-radius: 50px;
  background: transparent;
  color: var(--text-secondary);
  font-family: 'Noto Serif SC', serif;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: 0.4s;
  position: relative;
  overflow: hidden;
}

.filter-tab::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-main);
  opacity: 0;
  transition: 0.4s;
  z-index: -1;
}

.filter-tab:hover {
  border-color: var(--accent-purple);
  color: var(--text-primary);
}

.filter-tab.active {
  border-color: transparent;
  color: var(--text-primary);
}

.filter-tab.active::before {
  opacity: 1;
}

/* Portfolio Grid */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  padding: 0 24px;
  max-width: var(--container-width);
  margin: 0 auto;
}

.portfolio-item {
  position: relative;
  border-radius: 20px;
  overflow: hidden;
  aspect-ratio: 3/4;
  cursor: pointer;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s, transform 0.6s, box-shadow 0.4s;
}

.portfolio-item.show {
  opacity: 1;
  transform: translateY(0);
}

.portfolio-item.hide {
  opacity: 0;
  transform: scale(0.9);
  position: absolute;
  pointer-events: none;
}

.portfolio-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: 0.6s;
}

.portfolio-item:hover img {
  transform: scale(1.1);
}

.portfolio-item::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(10, 10, 15, 0.95) 0%, transparent 60%);
  z-index: 1;
  opacity: 0;
  transition: 0.4s;
}

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

.portfolio-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 24px;
  z-index: 2;
  transform: translateY(100%);
  transition: 0.4s;
}

.portfolio-item:hover .portfolio-overlay {
  transform: translateY(0);
}

.portfolio-overlay h3 {
  font-size: 1.3rem;
  margin-bottom: 8px;
}

.portfolio-overlay p {
  font-size: 0.9rem;
  margin: 0;
  color: var(--accent-purple);
}

.portfolio-tags {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.tag {
  padding: 4px 12px;
  background: rgba(139, 92, 246, 0.2);
  border-radius: 20px;
  font-size: 0.75rem;
  color: var(--accent-purple);
}

/* Lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(10, 10, 15, 0.95);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: 0.4s;
}

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

.lightbox-content {
  max-width: 90vw;
  max-height: 90vh;
  transform: scale(0.9);
  transition: 0.4s;
}

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

.lightbox-close {
  position: absolute;
  top: 24px;
  right: 24px;
  width: 50px;
  height: 50px;
  border: none;
  background: var(--bg-card);
  border-radius: 50%;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  transition: 0.4s;
}

.lightbox-close:hover {
  background: var(--accent-purple);
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 50px;
  height: 50px;
  border: none;
  background: var(--bg-card);
  border-radius: 50%;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  transition: 0.4s;
}

.lightbox-nav:hover {
  background: var(--accent-purple);
}

.lightbox-prev {
  left: 24px;
}

.lightbox-next {
  right: 24px;
}

/* Responsive */
@media (max-width: 968px) {
  .portfolio-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .portfolio-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .filter-tabs {
    gap: 10px;
  }

  .filter-tab {
    padding: 12px 24px;
    font-size: 0.9rem;
  }
}