/* ============================================
   CSS Variables & Reset
   ============================================ */
:root {
  --color-bg: #09090b;
  --color-surface: #18181b;
  --color-surface-raised: #27272a;
  --color-surface-hover: #303036;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-strong: rgba(255, 255, 255, 0.14);
  --color-text: #fafafa;
  --color-text-secondary: #a1a1aa;
  --color-text-muted: #71717a;
  --color-accent: #8b5cf6;
  --color-accent-hover: #a78bfa;
  --color-accent-glow: rgba(139, 92, 246, 0.25);
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius-xs: 6px;
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1320px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 48px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 60px var(--color-accent-glow);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ============================================
   Hero
   ============================================ */
.hero {
  position: relative;
  height: 60vh;
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: var(--color-bg);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: blur(0);
  transition: filter 0.5s ease;
}

.hero-bg.has-image {
  filter: blur(2px) brightness(0.4);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, var(--color-accent-glow), transparent),
    linear-gradient(180deg, transparent 0%, var(--color-bg) 100%);
}

.hero-particles {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.hero-particles::before,
.hero-particles::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  animation: float 20s infinite ease-in-out;
}

.hero-particles::before {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.08) 0%, transparent 70%);
  top: 10%;
  left: 15%;
}

.hero-particles::after {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.06) 0%, transparent 70%);
  bottom: 10%;
  right: 10%;
  animation-delay: -10s;
  animation-direction: reverse;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(30px, -20px) scale(1.05); }
  50% { transform: translate(-20px, 15px) scale(0.95); }
  75% { transform: translate(15px, 25px) scale(1.02); }
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 2rem;
  max-width: 720px;
  animation: heroIn 0.8s ease-out;
}

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

.hero h1 {
  font-size: clamp(2.25rem, 6vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 0.75rem;
  background: linear-gradient(135deg, #fff 0%, #d4d4d8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.event-date {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 1rem;
  padding: 0.35rem 1rem;
  background: rgba(139, 92, 246, 0.12);
  border: 1px solid rgba(139, 92, 246, 0.2);
  border-radius: 999px;
  letter-spacing: 0.02em;
}

.event-description {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.7;
}

.hero-stats {
  display: flex;
  gap: 2rem;
  justify-content: center;
  margin-top: 2rem;
}

.hero-stat {
  text-align: center;
}

.hero-stat-number {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1;
}

.hero-stat-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 0.25rem;
}

/* ============================================
   Navigation
   ============================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(9, 9, 11, 0.8);
  backdrop-filter: blur(20px) saturate(1.5);
  -webkit-backdrop-filter: blur(20px) saturate(1.5);
  border-bottom: 1px solid var(--color-border);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.6rem 1.5rem;
}

.nav-link {
  position: relative;
  text-decoration: none;
  color: var(--color-text-muted);
  padding: 0.55rem 1.25rem;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 500;
  transition: var(--transition-fast);
  border: 1px solid transparent;
  letter-spacing: 0.01em;
  user-select: none;
}

.nav-link .nav-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.25rem;
  height: 1.25rem;
  padding: 0 0.35rem;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 600;
  margin-left: 0.4rem;
  background: var(--color-surface-raised);
  color: var(--color-text-muted);
  transition: var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-text);
  background: var(--color-surface);
}

.nav-link.active {
  color: var(--color-text);
  background: var(--color-surface);
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-sm);
}

.nav-link.active .nav-badge {
  background: var(--color-accent);
  color: #fff;
}

/* ============================================
   Sections
   ============================================ */
.section {
  padding: 3rem 0 4rem;
  min-height: 50vh;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section-header {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 2rem;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section-count {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-weight: 400;
}

.empty-message {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 1.05rem;
  padding: 5rem 0;
}

.empty-message .empty-icon {
  font-size: 3rem;
  display: block;
  margin-bottom: 1rem;
  opacity: 0.5;
}

/* ============================================
   Photos Grid — Masonry-like
   ============================================ */
.photos-grid {
  columns: 4;
  column-gap: 0.75rem;
}

.photo-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  background: var(--color-surface);
  break-inside: avoid;
  margin-bottom: 0.75rem;
  transition: transform var(--transition), box-shadow var(--transition);
  opacity: 0;
  animation: cardIn 0.5s ease forwards;
}

@keyframes cardIn {
  from { opacity: 0; transform: scale(0.95) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.photo-card:hover {
  transform: translateY(-3px) scale(1.01);
  box-shadow: var(--shadow-lg);
  z-index: 2;
}

.photo-card img {
  display: block;
  width: 100%;
  height: auto;
  transition: transform var(--transition-slow), filter var(--transition);
}

.photo-card .photo-thumb {
  filter: blur(20px);
  transform: scale(1.1);
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
  transition: opacity var(--transition);
}

.photo-card .photo-full {
  position: relative;
  z-index: 2;
}

.photo-card .photo-full.loaded + .photo-thumb {
  opacity: 0;
}

.photo-card:hover img.photo-full {
  transform: scale(1.04);
}

.photo-card .photo-overlay {
  position: absolute;
  inset: 0;
  z-index: 3;
  background: linear-gradient(
    180deg,
    transparent 50%,
    rgba(0, 0, 0, 0.7) 100%
  );
  opacity: 0;
  transition: opacity var(--transition);
  display: flex;
  align-items: flex-end;
  padding: 1rem;
}

.photo-card:hover .photo-overlay {
  opacity: 1;
}

.photo-overlay .photo-caption {
  font-size: 0.85rem;
  color: #fff;
  font-weight: 500;
  text-shadow: 0 1px 3px rgba(0,0,0,0.5);
}

/* ============================================
   Slides Grid
   ============================================ */
.slides-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
}

.slide-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
  opacity: 0;
  animation: cardIn 0.5s ease forwards;
}

.slide-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-border-strong);
}

.slide-card .slide-preview {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--color-bg);
  overflow: hidden;
}

.slide-card .slide-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.slide-card:hover .slide-preview img {
  transform: scale(1.04);
}

.slide-preview .slide-format-badge {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  padding: 0.2rem 0.6rem;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-xs);
  font-size: 0.7rem;
  font-weight: 600;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.slide-icon {
  font-size: 2.5rem;
  width: 100%;
  aspect-ratio: 16 / 9;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, #18181b 0%, #1e1b4b 100%);
}

.slide-icon-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  font-weight: 600;
}

.slide-card .slide-info {
  padding: 1.25rem;
}

.slide-card .slide-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.2rem;
  line-height: 1.4;
}

.slide-card .slide-meta {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.slide-card .slide-actions {
  display: flex;
  gap: 0.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 1.1rem;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition-fast);
  letter-spacing: 0.01em;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 2px 8px rgba(139, 92, 246, 0.3);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  box-shadow: 0 4px 16px rgba(139, 92, 246, 0.4);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--color-surface-raised);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
  border-color: var(--color-border-strong);
}

/* ============================================
   Lightbox
   ============================================ */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.96);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: lbIn 0.25s ease;
  touch-action: none;
}

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

.lightbox-content {
  max-width: 92vw;
  max-height: 92vh;
  text-align: center;
  user-select: none;
}

.lightbox-content img {
  max-width: 92vw;
  max-height: 82vh;
  object-fit: contain;
  border-radius: var(--radius-sm);
  transition: transform var(--transition);
}

.lightbox-toolbar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  background: linear-gradient(180deg, rgba(0,0,0,0.6) 0%, transparent 100%);
  z-index: 1001;
}

.lightbox-toolbar-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.lightbox-counter {
  font-size: 0.8rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.7);
  background: rgba(255, 255, 255, 0.1);
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  backdrop-filter: blur(8px);
}

.lightbox-close,
.lightbox-prev,
.lightbox-next {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  color: #fff;
  cursor: pointer;
  transition: var(--transition-fast);
  z-index: 1001;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-close {
  position: static;
  width: 40px;
  height: 40px;
  font-size: 1.3rem;
}

.lightbox-prev,
.lightbox-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  font-size: 1.3rem;
}

.lightbox-prev { left: 1.25rem; }
.lightbox-next { right: 1.25rem; }

.lightbox-close:hover,
.lightbox-prev:hover,
.lightbox-next:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.2);
}

.lightbox-bottom {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 3rem 1.5rem 1.5rem;
  background: linear-gradient(0deg, rgba(0,0,0,0.7) 0%, transparent 100%);
  text-align: center;
  z-index: 1001;
}

.lightbox-caption {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.95rem;
  font-weight: 500;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  text-align: center;
  padding: 2.5rem 1.5rem;
  color: var(--color-text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--color-border);
  margin-top: 2rem;
  letter-spacing: 0.01em;
}

.footer a {
  color: var(--color-text-secondary);
  text-decoration: none;
}

.footer a:hover {
  color: var(--color-accent);
}

/* ============================================
   Scroll Animation
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .photos-grid {
    columns: 3;
  }
}

@media (max-width: 768px) {
  .hero {
    height: 50vh;
    min-height: 320px;
  }

  .photos-grid {
    columns: 2;
    column-gap: 0.5rem;
  }

  .photo-card {
    margin-bottom: 0.5rem;
  }

  .slides-grid {
    grid-template-columns: 1fr;
  }

  .lightbox-prev,
  .lightbox-next {
    width: 40px;
    height: 40px;
    font-size: 1.1rem;
  }

  .lightbox-prev { left: 0.75rem; }
  .lightbox-next { right: 0.75rem; }

  .hero-stats {
    gap: 1.5rem;
  }
}

@media (max-width: 480px) {
  .photos-grid {
    columns: 2;
    column-gap: 0.35rem;
  }

  .photo-card {
    margin-bottom: 0.35rem;
    border-radius: var(--radius-sm);
  }

  .nav-container {
    justify-content: center;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .hero-stats {
    gap: 1rem;
  }

  .hero-stat-number {
    font-size: 1.35rem;
  }
}