/* ==========================================================================
   Portfolio Stylesheet (융합디자인 포트폴리오)
   - 모던하고 미니멀한 갤러리 & 슬라이더 테마
   - 반응형 디자인 지원 (Desktop, Tablet, Mobile)
   ========================================================================== */

:root {
  --bg-primary: #0f1015;
  --bg-secondary: #171821;
  --bg-card: #1f202e;
  --bg-card-hover: #27283a;
  --text-main: #f5f6fa;
  --text-muted: #9ba1b0;
  --accent: #5e60ce;
  --accent-light: #7400b8;
  --accent-glow: rgba(94, 96, 206, 0.35);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-active: rgba(255, 255, 255, 0.25);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --transition-smooth: all 0.35s cubic-bezier(0.25, 1, 0.5, 1);
}

/* Base Reset & Typography */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background-color: rgba(15, 16, 21, 0.82);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition-smooth);
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  color: var(--text-main);
  background: linear-gradient(135deg, #fff 0%, var(--text-muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  gap: 1.75rem;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition-smooth);
}

.nav-links a:hover {
  color: var(--text-main);
}

/* Main Layout */
.main-content {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 5rem;
}

/* Section Title */
.section-title-wrap {
  text-align: center;
  margin-bottom: 2.5rem;
}

.section-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--accent);
  background: rgba(94, 96, 206, 0.12);
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  border: 1px solid rgba(94, 96, 206, 0.3);
  margin-bottom: 0.75rem;
}

.section-heading {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #ffffff;
}

.section-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 0.5rem;
}

/* ==========================================================================
   Featured Slider Section
   ========================================================================== */
.slider-section {
  margin-bottom: 5rem;
}

.slider-container {
  position: relative;
  max-width: 1100px;
  margin: 0 auto;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  user-select: none;
}

.slider-track {
  display: flex;
  width: 100%;
  transition: transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
  will-change: transform;
}

/* Individual Slide */
.slide-item {
  min-width: 100%;
  display: flex;
  flex-direction: column;
  position: relative;
  background: #0b0c10;
}

.slide-media-wrap {
  position: relative;
  width: 100%;
  height: 600px;
  display: flex;
  justify-content: center;
  align-items: center;
  background: radial-gradient(circle at center, #1c1d29 0%, #0a0b0e 100%);
  overflow: hidden;
  cursor: zoom-in;
}

/* Background Blur Canvas for Artwork Aura */
.slide-backdrop {
  position: absolute;
  top: -20%;
  left: -20%;
  width: 140%;
  height: 140%;
  background-size: cover;
  background-position: center;
  filter: blur(40px) brightness(0.35);
  opacity: 0.6;
  pointer-events: none;
}

.slide-img {
  position: relative;
  max-width: 90%;
  max-height: 88%;
  object-fit: contain;
  border-radius: var(--radius-md);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.65);
  transition: transform 0.4s ease;
  z-index: 1;
}

.slide-media-wrap:hover .slide-img {
  transform: scale(1.015);
}

.zoom-hint {
  position: absolute;
  bottom: 1.25rem;
  right: 1.5rem;
  z-index: 2;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  color: #fff;
  font-size: 0.78rem;
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  opacity: 0.8;
  transition: opacity 0.2s;
}

.slide-media-wrap:hover .zoom-hint {
  opacity: 1;
}

/* Slide Info (Bottom metadata) */
.slide-info {
  padding: 1.5rem 2rem;
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
}

.slide-info-left {
  flex: 1;
}

.slide-category {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--accent);
  text-transform: uppercase;
}

.slide-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0.25rem 0 0.35rem;
  color: #ffffff;
}

.slide-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.slide-view-btn {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition-smooth);
}

.slide-view-btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 4px 15px var(--accent-glow);
}

/* Navigation Arrows */
.nav-btn {
  position: absolute;
  top: 45%;
  transform: translateY(-50%);
  z-index: 10;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(15, 16, 21, 0.7);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.nav-btn:hover {
  background: rgba(94, 96, 206, 0.85);
  border-color: rgba(255, 255, 255, 0.4);
  transform: translateY(-50%) scale(1.08);
  box-shadow: 0 0 20px var(--accent-glow);
}

.prev-btn {
  left: 1.25rem;
}

.next-btn {
  right: 1.25rem;
}

/* Slider Footer / Controls */
.slider-footer {
  padding: 1rem 2rem;
  background: #14151e;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.slide-counter {
  font-family: monospace;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-main);
}

.slide-counter .divider {
  color: var(--text-muted);
  margin: 0 0.35rem;
}

/* Dots Indicator */
.slider-dots {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.2);
  border: none;
  cursor: pointer;
  transition: var(--transition-smooth);
  padding: 0;
}

.dot.active {
  width: 32px;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent-glow);
}

.dot:hover:not(.active) {
  background: rgba(255, 255, 255, 0.45);
}

/* Autoplay Button */
.autoplay-toggle {
  display: flex;
  align-items: center;
}

.play-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  padding: 0.4rem 0.9rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition-smooth);
}

.play-btn .status-indicator {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: #2ed573;
  box-shadow: 0 0 8px #2ed573;
}

.play-btn.paused .status-indicator {
  background-color: #ff4757;
  box-shadow: 0 0 8px #ff4757;
}

.play-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--text-main);
}

/* ==========================================================================
   Gallery Grid Section
   ========================================================================== */
.gallery-section {
  margin-bottom: 5rem;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.gallery-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
}

.gallery-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-active);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4);
}

.card-img-wrap {
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: #0c0d12;
  position: relative;
}

.card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.gallery-card:hover .card-img {
  transform: scale(1.06);
}

.card-badge {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  background: rgba(15, 16, 21, 0.75);
  backdrop-filter: blur(6px);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.card-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 0.4rem;
}

.card-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.4;
  flex-grow: 1;
}

.card-footer {
  margin-top: 1rem;
  font-size: 0.78rem;
  color: var(--accent);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

/* ==========================================================================
   About Section
   ========================================================================== */
.about-section {
  margin-bottom: 4rem;
}

.about-card {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, #1a1b26 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.about-card h3 {
  font-size: 1.4rem;
  margin-bottom: 0.75rem;
  color: #fff;
}

.about-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.guide-note {
  margin-top: 1.25rem;
  padding: 0.85rem 1.25rem;
  background: rgba(94, 96, 206, 0.08);
  border-left: 3px solid var(--accent);
  border-radius: 4px;
  text-align: left;
  display: inline-block;
  font-size: 0.88rem !important;
  color: #c7cbdb !important;
}

.guide-note code {
  background: rgba(255, 255, 255, 0.1);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  color: #e2e8f0;
}

/* ==========================================================================
   Lightbox Modal
   ========================================================================== */
.lightbox-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(5, 6, 9, 0.92);
  backdrop-filter: blur(14px);
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  padding: 1.5rem;
}

.lightbox-modal.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-close {
  position: absolute;
  top: 1.5rem;
  right: 2rem;
  background: transparent;
  border: none;
  color: #fff;
  font-size: 2.5rem;
  line-height: 1;
  cursor: pointer;
  transition: transform 0.2s;
  z-index: 1010;
}

.modal-close:hover {
  transform: scale(1.15) rotate(90deg);
  color: var(--accent);
}

.lightbox-content {
  max-width: 90vw;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.lightbox-content img {
  max-width: 100%;
  max-height: 75vh;
  object-fit: contain;
  border-radius: var(--radius-sm);
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.8);
}

.lightbox-info {
  margin-top: 1.25rem;
  text-align: center;
  max-width: 600px;
}

.lightbox-info h3 {
  font-size: 1.3rem;
  color: #fff;
  margin-bottom: 0.35rem;
}

.lightbox-info p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Footer */
.site-footer {
  text-align: center;
  padding: 2.5rem 1rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ==========================================================================
   Responsive Queries
   ========================================================================== */
@media (max-width: 768px) {
  .slide-media-wrap {
    height: 380px;
  }

  .section-heading {
    font-size: 1.7rem;
  }

  .nav-btn {
    width: 42px;
    height: 42px;
  }

  .slide-info {
    flex-direction: column;
    align-items: flex-start;
    padding: 1.2rem;
  }

  .slide-view-btn {
    width: 100%;
    text-align: center;
  }

  .slider-footer {
    padding: 0.85rem 1.25rem;
  }
}