/* Reset & Global Settings */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-color: #0f1115;
  --card-bg: #181b21;
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --accent: #3b82f6;
  --accent-hover: #60a5fa;
  --border-color: rgba(255, 255, 255, 0.08);
  --shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.7);
  --radius: 14px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Pretendard', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 2rem 1rem;
}

.portfolio-container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
}

/* Header */
.header {
  text-align: center;
  margin-bottom: 2rem;
}

.logo {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: 0.2em;
  background: linear-gradient(135deg, #fff 0%, #9ca3af 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-transform: uppercase;
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  margin-top: 0.3rem;
}

/* Slider Section */
.slider-wrapper {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* Top Controls */
.top-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 0.5rem;
}

.slide-counter {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.action-buttons {
  display: flex;
  gap: 0.5rem;
}

.icon-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  width: 36px;
  height: 36px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.icon-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--accent);
}

/* Slider Viewport & Track */
.slider-viewport {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background-color: #000;
  border-radius: 10px;
  overflow: hidden;
  user-select: none;
  cursor: grab;
}

.slider-viewport.grabbing {
  cursor: grabbing;
}

.slides-track {
  display: flex;
  width: 100%;
  height: 100%;
  transition: transform 0.45s cubic-bezier(0.25, 1, 0.5, 1);
}

.slide {
  min-width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background-color: #07080a;
}

.slide img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  pointer-events: none;
}

/* Navigation Arrows */
.nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  background: rgba(15, 17, 21, 0.65);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #fff;
  border-radius: 50%;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  z-index: 10;
}

.nav-btn:hover {
  background: rgba(59, 130, 246, 0.85);
  transform: translateY(-50%) scale(1.08);
}

.nav-btn.prev {
  left: 1rem;
}

.nav-btn.next {
  right: 1rem;
}

/* Slide Info (Title & Description) */
.slide-info {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.project-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.35rem;
  transition: opacity 0.3s ease;
}

.project-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
  transition: opacity 0.3s ease;
}

/* Dots Pagination */
.dots-container {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.6rem;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  cursor: pointer;
  transition: all 0.3s ease;
}

.dot.active {
  width: 28px;
  border-radius: 10px;
  background: var(--accent);
}

/* Thumbnail Strip */
.thumbnails-container {
  display: flex;
  gap: 0.75rem;
  overflow-x: auto;
  padding: 0.5rem 0.25rem;
  scrollbar-width: thin;
  scrollbar-color: var(--border-color) transparent;
}

.thumbnails-container::-webkit-scrollbar {
  height: 6px;
}

.thumbnails-container::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

.thumb-item {
  flex: 0 0 100px;
  height: 65px;
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  border: 2px solid transparent;
  opacity: 0.5;
  transition: all 0.25s ease;
  background-color: #000;
}

.thumb-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.thumb-item:hover {
  opacity: 0.85;
}

.thumb-item.active {
  opacity: 1;
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

/* Lightbox Modal */
.lightbox {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.92);
  backdrop-filter: blur(10px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 2rem;
  flex-direction: column;
}

.lightbox.active {
  display: flex;
  animation: fadeIn 0.25s ease;
}

.lightbox-image {
  max-width: 90vw;
  max-height: 82vh;
  object-fit: contain;
  border-radius: 6px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.8);
}

.lightbox-caption {
  color: var(--text-muted);
  margin-top: 1rem;
  font-size: 0.95rem;
  text-align: center;
}

.lightbox-close {
  position: absolute;
  top: 1.5rem;
  right: 2rem;
  font-size: 2.5rem;
  color: #fff;
  cursor: pointer;
  line-height: 1;
  transition: transform 0.2s ease, color 0.2s ease;
}

.lightbox-close:hover {
  color: var(--accent);
  transform: scale(1.15);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Responsive */
@media (max-width: 768px) {
  .portfolio-container {
    padding: 0;
  }
  
  .slider-wrapper {
    padding: 1rem;
    gap: 1rem;
  }

  .slider-viewport {
    aspect-ratio: 4 / 3;
  }

  .nav-btn {
    width: 36px;
    height: 36px;
    font-size: 1rem;
  }

  .thumb-item {
    flex: 0 0 75px;
    height: 50px;
  }
}