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

:root {
  --bg: #0a0a0f;
  --text: #e8e8ed;
  --text-muted: #888;
  --gap: 6px;
  --accent: #4d9fff;
}

html { font-size: 16px; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* ── Header ── */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 32px;
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
}

.site-logo {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: var(--text);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav a {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  opacity: 0.6;
  transition: opacity 0.2s;
}

.site-nav a:hover,
.site-nav a.active {
  opacity: 1;
}

/* ── Grid — Wannerstedt-style ── */
.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
  padding: 0 var(--gap) var(--gap);
}

/* ── Tile (card flip container) ── */
.tile {
  position: relative;
  display: block;
  aspect-ratio: 16 / 10;
  cursor: pointer;
  perspective: 1200px;
}

.tile-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}

.tile.flipped .tile-inner {
  transform: rotateY(180deg);
}

.tile-front,
.tile-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  overflow: hidden;
}

/* ── Front face ── */
.tile-front {
  background: #1a1a24;
}

.tile-front img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.tile:not(.flipped):hover .tile-front img {
  transform: scale(1.04);
}

/* Title overlay on front */
.tile-label {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0);
  transition: background 0.35s;
  pointer-events: none;
}

.tile-label span {
  font-size: clamp(1.1rem, 2.2vw, 1.8rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: #fff;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.35s, transform 0.35s;
  text-shadow: 0 2px 12px rgba(0,0,0,0.3);
}

.tile:not(.flipped):hover .tile-label {
  background: rgba(0, 0, 0, 0.25);
}

.tile:not(.flipped):hover .tile-label span {
  opacity: 1;
  transform: translateY(0);
}

/* Fallback when no thumbnail */
.tile-fallback {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tile-fallback[data-color="0"] { background: linear-gradient(135deg, #1a1040, #2d1b69); }
.tile-fallback[data-color="1"] { background: linear-gradient(135deg, #0f2027, #203a43); }
.tile-fallback[data-color="2"] { background: linear-gradient(135deg, #1a0a2e, #3a1c71); }
.tile-fallback[data-color="3"] { background: linear-gradient(135deg, #0d1117, #1b3a4b); }
.tile-fallback[data-color="4"] { background: linear-gradient(135deg, #1a1a2e, #16213e); }
.tile-fallback[data-color="5"] { background: linear-gradient(135deg, #0a1628, #1a3a5c); }
.tile-fallback[data-color="6"] { background: linear-gradient(135deg, #1b0a2e, #4a1c6b); }
.tile-fallback[data-color="7"] { background: linear-gradient(135deg, #0d1f17, #1b4b3a); }
.tile-fallback[data-color="8"] { background: linear-gradient(135deg, #2e1a0a, #5c3a1a); }

/* Show label by default on tiles without thumbnails */
.tile.no-thumb .tile-label {
  background: rgba(0, 0, 0, 0.3);
}

.tile.no-thumb .tile-label span {
  opacity: 1;
  transform: translateY(0);
}

/* ── Back face ── */
.tile-back {
  transform: rotateY(180deg);
  background: #0c0c14;
}

/* Blurred thumbnail backdrop */
.tile-back-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: blur(40px) brightness(0.35) saturate(1.4);
  transform: scale(1.15);
}

/* Dark overlay on top of blurred bg */
.tile-back-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(0, 0, 0, 0.6) 0%,
    rgba(0, 0, 0, 0.3) 50%,
    rgba(0, 0, 0, 0.5) 100%
  );
}

/* Large watermark number */
.tile-back-number {
  position: absolute;
  top: clamp(12px, 2vw, 24px);
  left: clamp(16px, 3vw, 32px);
  font-size: clamp(3rem, 7vw, 6rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--accent, #4d9fff);
  opacity: 0.12;
  line-height: 1;
  z-index: 1;
  opacity: 0;
  transform: translateX(-20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.tile.flipped .tile-back-number {
  opacity: 0.12;
  transform: translateX(0);
  transition-delay: 0.15s;
}

.tile-back-close {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 5;
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.7);
  border: none;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, color 0.2s;
  backdrop-filter: blur(4px);
}

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

/* Content container */
.tile-back-content {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 100%;
  padding: clamp(24px, 4vw, 48px);
  padding-left: clamp(24px, 5vw, 56px);
}

/* Accent line above title */
.tile-back-line {
  width: 32px;
  height: 3px;
  background: var(--accent, #4d9fff);
  border-radius: 2px;
  margin-bottom: 14px;
  opacity: 0;
  transform: scaleX(0);
  transform-origin: left;
  transition: opacity 0.3s ease, transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.tile.flipped .tile-back-line {
  opacity: 1;
  transform: scaleX(1);
  transition-delay: 0.2s;
}

/* Staggered slide-in for back face content */
.tile-back-title,
.tile-back-desc,
.tile-back-tags,
.tile-back-launch {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.tile.flipped .tile-back-title  { opacity: 1; transform: translateY(0); transition-delay: 0.28s; }
.tile.flipped .tile-back-desc   { opacity: 1; transform: translateY(0); transition-delay: 0.36s; }
.tile.flipped .tile-back-tags   { opacity: 1; transform: translateY(0); transition-delay: 0.44s; }
.tile.flipped .tile-back-launch { opacity: 1; transform: translateY(0); transition-delay: 0.52s; }

.tile-back-title {
  font-size: clamp(1.2rem, 2.4vw, 1.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #fff;
  margin-bottom: 10px;
}

.tile-back-desc {
  font-size: clamp(0.78rem, 1.2vw, 0.92rem);
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.65);
  margin-bottom: 16px;
  max-width: 520px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.tile-back-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
}

.tile-back-tag {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 100px;
  background: color-mix(in srgb, var(--accent, #4d9fff) 15%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent, #4d9fff) 30%, transparent);
  color: color-mix(in srgb, var(--accent, #4d9fff) 80%, white);
}

.tile-back-launch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  align-self: flex-start;
  padding: 10px 24px;
  background: var(--accent, #4d9fff);
  color: #fff;
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 8px;
  transition: filter 0.2s, transform 0.15s;
  box-shadow: 0 4px 20px color-mix(in srgb, var(--accent, #4d9fff) 40%, transparent);
}

.tile-back-launch:hover {
  filter: brightness(1.15);
  transform: translateY(-1px);
}

/* ── Footer ── */
.site-footer {
  padding: 32px;
  text-align: center;
}

.site-footer p {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ── Back-to-top ── */
.back-to-top {
  display: none;
  position: fixed;
  bottom: 28px;
  right: 28px;
  background: var(--text);
  color: var(--bg);
  border: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  font-size: 1.1rem;
  cursor: pointer;
  z-index: 200;
  transition: opacity 0.2s;
}

.back-to-top.visible {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ── Scroll Animations ── */
.tile {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

/* ── Responsive ── */
@media (max-width: 640px) {
  .grid {
    grid-template-columns: 1fr;
  }
  .site-header {
    padding: 16px 20px;
  }
  .tile {
    aspect-ratio: 16 / 11;
  }
  .tile-back-content {
    padding: 20px;
  }
  .tile-back-desc {
    -webkit-line-clamp: 2;
  }
  .tile-back-number {
    top: 10px;
    left: 16px;
  }
}