/* ── Reset & Base ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #ffffff;
  --surface: #f8f8f8;
  --border: #e0e0e0;
  --text-primary: #1a1a1a;
  --text-secondary: #6e6e6e;
  --text-muted: #9e9e9e;
  --accent: #0057FF;
  --accent-hover: #0046cc;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-card: 0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.06);
  --shadow-card-hover: 0 4px 12px rgba(0,0,0,.12), 0 12px 32px rgba(0,0,0,.10);
  --transition: 0.22s cubic-bezier(.4,0,.2,1);
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* ── Header ───────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 32px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.header-logo-text {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.3px;
  color: var(--text-primary);
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.nav-link:hover { color: var(--text-primary); background: var(--surface); }
.nav-link.active { color: var(--text-primary); font-weight: 600; }

/* ── Main ─────────────────────────────────────────────────── */
.main-content {
  max-width: 1440px;
  margin: 0 auto;
  padding: 48px 32px 80px;
}

/* ── Section ──────────────────────────────────────────────── */
.projects-section { margin-bottom: 72px; }

.section-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 28px;
}

.section-title {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.4px;
  color: var(--text-primary);
}

.section-count {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 400;
}

/* ── Grid ─────────────────────────────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

/* ── Card ─────────────────────────────────────────────────── */
.project-card {
  background: var(--bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition), transform var(--transition);
  border: 1px solid var(--border);
  position: relative;
}

.project-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-3px);
}

.card-thumb-wrap {
  position: relative;
  width: 100%;
  padding-top: 66.66%; /* 3:2 ratio */
  overflow: hidden;
  background: var(--surface);
}

.card-thumb {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s cubic-bezier(.4,0,.2,1);
  display: block;
}

.project-card:hover .card-thumb { transform: scale(1.04); }

.card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.45) 0%, transparent 55%);
  opacity: 0;
  transition: opacity var(--transition);
  display: flex;
  align-items: flex-end;
  padding: 16px;
}

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

.card-overlay-label {
  font-size: 12px;
  font-weight: 600;
  color: rgba(255,255,255,0.9);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.card-body {
  padding: 14px 16px 16px;
}

.card-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-meta {
  margin-top: 5px;
  font-size: 12px;
  color: var(--text-muted);
}

/* ── Load More ────────────────────────────────────────────── */
.load-more-wrap {
  margin-top: 36px;
  display: flex;
  justify-content: center;
}

.load-more-btn {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: 100px;
  padding: 10px 28px;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), color var(--transition);
  letter-spacing: 0.1px;
}

.load-more-btn:hover {
  border-color: var(--text-primary);
  background: var(--text-primary);
  color: #fff;
}

.load-more-wrap.hidden { display: none; }

/* ── Lightbox ─────────────────────────────────────────────── */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.lightbox.open {
  pointer-events: all;
  opacity: 1;
}

.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.82);
  cursor: pointer;
}

.lightbox-panel {
  position: relative;
  z-index: 1;
  width: calc(100% - 120px);
  max-width: 1100px;
  max-height: 100vh;
  display: flex;
  flex-direction: column;
  background: #111111;
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: 24px 0;
  transform: translateY(16px) scale(0.98);
  transition: transform 0.28s cubic-bezier(.4,0,.2,1);
  box-shadow: 0 24px 80px rgba(0,0,0,0.6);
}

.lightbox.open .lightbox-panel {
  transform: translateY(0) scale(1);
}

.lightbox-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  flex-shrink: 0;
  background: #111111;
}

.lightbox-title {
  font-size: 15px;
  font-weight: 600;
  color: rgba(255,255,255,0.9);
  letter-spacing: -0.2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: calc(100% - 60px);
}

.lightbox-close {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.8);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background var(--transition), color var(--transition);
}

.lightbox-close:hover {
  background: rgba(255,255,255,0.2);
  color: #fff;
}

.lightbox-scroll {
  overflow-y: auto;
  flex: 1;
  overscroll-behavior: contain;
}

.lightbox-scroll::-webkit-scrollbar { width: 6px; }
.lightbox-scroll::-webkit-scrollbar-track { background: transparent; }
.lightbox-scroll::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 3px; }
.lightbox-scroll::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.25); }

.lightbox-images {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 4px 0 24px;
}

.lightbox-img {
  width: 100%;
  display: block;
  object-fit: contain;
  background: #0a0a0a;
}

.lightbox-img-skeleton {
  width: 100%;
  height: 500px;
  background: #1a1a1a;
  animation: skeleton-pulse 1.4s ease-in-out infinite;
}

@keyframes skeleton-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 900px) {
  .header-inner { padding: 0 20px; }
  .main-content { padding: 32px 20px 60px; }
  .projects-grid { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
  .lightbox-panel { width: calc(100% - 32px); margin: 12px 0; }
}

@media (max-width: 600px) {
  .projects-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .lightbox-panel { width: 100%; border-radius: var(--radius-md) var(--radius-md) 0 0; margin: auto 0 0; }
  .lightbox { align-items: flex-end; }
}