/* -------------------------------------------------------------
   KIM HYEONJEONG Portfolio — Modern Slider Style
   Pure CSS3, Responsive, Dark Gallery Aesthetic
------------------------------------------------------------- */

:root {
  --bg-color: #0d0f12;
  --bg-secondary: #161920;
  --bg-card: rgba(26, 30, 39, 0.7);
  --border-color: rgba(255, 255, 255, 0.1);
  --border-hover: rgba(255, 255, 255, 0.25);
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;
  --accent-color: #3b82f6;
  --accent-glow: rgba(59, 130, 246, 0.35);
  --transition-smooth: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --font-stack: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

html, body {
  width: 100%;
  min-height: 100vh;
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: var(--font-stack);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Background ambient light */
body::before {
  content: "";
  position: fixed;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.08) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  background: rgba(13, 15, 18, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  z-index: 50;
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand .logo-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.brand .logo-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.slide-indicator {
  font-size: 0.88rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  padding: 0.35rem 0.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  padding: 0.4rem 0.85rem;
  border-radius: 20px;
  font-size: 0.82rem;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.icon-btn:hover {
  background: var(--bg-secondary);
  border-color: var(--border-hover);
  color: #ffffff;
}

.icon-btn.playing {
  border-color: var(--accent-color);
  box-shadow: 0 0 12px var(--accent-glow);
}

.contact-link {
  color: var(--text-main);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.4rem 0.95rem;
  background: #ffffff;
  color: #000000;
  border-radius: 20px;
  transition: var(--transition-smooth);
}

.contact-link:hover {
  background: #e5e7eb;
  transform: translateY(-1px);
}

/* Slider Section */
.slider-container {
  position: relative;
  max-width: 1200px;
  margin: 1.5rem auto 1rem;
  padding: 0 1.5rem;
  min-height: 600px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  z-index: 10;
}

.slider-viewport {
  position: relative;
  width: 100%;
  min-height: 540px;
  border-radius: 16px;
  background: rgba(18, 21, 28, 0.5);
  border: 1px solid var(--border-color);
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

/* Individual Slide */
.slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  visibility: hidden;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  transition: opacity 0.5s cubic-bezier(0.16, 1, 0.3, 1), transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  transform: scale(0.98);
  pointer-events: none;
}

.slide.active {
  opacity: 1;
  visibility: visible;
  position: relative;
  transform: scale(1);
  pointer-events: auto;
}

/* Image Presentation */
.image-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 500px;
  padding: 2rem;
  background: radial-gradient(circle at center, rgba(30, 36, 48, 0.5) 0%, transparent 80%);
  cursor: zoom-in;
}

.image-wrapper img {
  max-width: 100%;
  max-height: 480px;
  object-fit: contain;
  border-radius: 10px;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
  transition: transform 0.4s ease;
  user-select: none;
  -webkit-user-drag: none;
}

.image-wrapper:hover img {
  transform: scale(1.02);
}

.zoom-badge {
  position: absolute;
  bottom: 2rem;
  right: 2.5rem;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: rgba(0, 0, 0, 0.75);
  color: #f3f4f6;
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 0.4rem 0.8rem;
  border-radius: 20px;
  font-size: 0.75rem;
  backdrop-filter: blur(8px);
  opacity: 0;
  transform: translateY(8px);
  transition: var(--transition-smooth);
  pointer-events: none;
}

.image-wrapper:hover .zoom-badge {
  opacity: 1;
  transform: translateY(0);
}

/* Caption Area */
.slide-caption {
  padding: 3rem 2.5rem 3rem 1rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.caption-tag {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-color);
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.3);
  padding: 0.3rem 0.75rem;
  border-radius: 14px;
  margin-bottom: 1.25rem;
}

.caption-title {
  font-size: 1.85rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 1rem;
  color: #ffffff;
}

.caption-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* Nav Arrows */
.nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(22, 25, 32, 0.8);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 20;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: var(--transition-smooth);
}

.nav-btn:hover {
  background: rgba(35, 40, 52, 0.95);
  border-color: #ffffff;
  color: #ffffff;
  transform: translateY(-50%) scale(1.08);
}

.prev-btn {
  left: 0.5rem;
}

.next-btn {
  right: 0.5rem;
}

/* Dots */
.dots-container {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.55rem;
  margin-top: 1.25rem;
}

.dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  border: none;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.dot:hover {
  background: rgba(255, 255, 255, 0.5);
}

.dot.active {
  width: 26px;
  border-radius: 8px;
  background: var(--accent-color);
  box-shadow: 0 0 10px var(--accent-glow);
}

/* Thumbnail Strip */
.thumbnail-section {
  max-width: 1200px;
  margin: 1.5rem auto;
  padding: 0 1.5rem;
}

.thumbnail-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 0.75rem;
  background: rgba(22, 25, 32, 0.5);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.thumb-item {
  position: relative;
  width: 90px;
  height: 64px;
  flex-shrink: 0;
  border-radius: 8px;
  overflow: hidden;
  border: 2px solid transparent;
  background: #111;
  cursor: pointer;
  opacity: 0.55;
  transition: var(--transition-smooth);
  padding: 0;
}

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

.thumb-num {
  position: absolute;
  bottom: 3px;
  right: 4px;
  font-size: 0.65rem;
  font-weight: 700;
  background: rgba(0, 0, 0, 0.75);
  color: #fff;
  padding: 1px 4px;
  border-radius: 3px;
}

.thumb-item:hover {
  opacity: 0.85;
  transform: translateY(-2px);
}

.thumb-item.active {
  opacity: 1;
  border-color: var(--accent-color);
  box-shadow: 0 0 12px var(--accent-glow);
}

/* Footer & Hints */
.site-footer {
  max-width: 1200px;
  margin: 1rem auto 2.5rem;
  padding: 0 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.8rem;
  color: var(--text-dim);
  font-size: 0.82rem;
}

.shortcuts-hint {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
}

.shortcuts-hint kbd {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.15rem 0.45rem;
  font-size: 0.75rem;
  font-family: inherit;
  color: var(--text-muted);
}

/* Lightbox Modal */
.lightbox {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

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

.lightbox-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(5, 7, 10, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.lightbox-content {
  position: relative;
  z-index: 101;
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-img-box {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.lightbox-img-box img {
  max-width: 85vw;
  max-height: 80vh;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.8);
  animation: zoomIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.lightbox-caption {
  margin-top: 1rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  letter-spacing: 0.05em;
  text-align: center;
}

.lightbox-close {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--border-color);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: rotate(90deg);
}

.lightbox-nav {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--border-color);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.lightbox-nav:hover {
  background: rgba(255, 255, 255, 0.25);
}

.lightbox-prev {
  left: 1.5rem;
}

.lightbox-next {
  right: 1.5rem;
}

@keyframes zoomIn {
  from {
    transform: scale(0.92);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

/* Responsive Media Queries */
@media (max-width: 900px) {
  .slide {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto;
    overflow-y: auto;
  }

  .slider-viewport {
    min-height: 640px;
  }

  .image-wrapper {
    min-height: 340px;
    padding: 1.5rem 1rem 0.5rem;
  }

  .image-wrapper img {
    max-height: 320px;
  }

  .slide-caption {
    padding: 1.25rem 1.5rem 2rem;
    text-align: center;
    align-items: center;
  }

  .caption-tag {
    align-self: center;
  }

  .caption-title {
    font-size: 1.45rem;
  }

  .prev-btn {
    left: 0.25rem;
  }

  .next-btn {
    right: 0.25rem;
  }

  .shortcuts-hint {
    display: none;
  }
}

@media (max-width: 600px) {
  .header-inner {
    padding: 0.85rem 1rem;
  }

  .brand .logo-title {
    font-size: 0.95rem;
  }

  .slider-container {
    padding: 0 0.5rem;
    margin-top: 0.75rem;
  }

  .slider-viewport {
    min-height: 580px;
    border-radius: 12px;
  }

  .image-wrapper img {
    max-height: 280px;
  }

  .nav-btn {
    width: 40px;
    height: 40px;
  }

  .thumb-item {
    width: 68px;
    height: 48px;
  }
}