/* ============================================
   SNOOWBRICKS — Instructions / Downloads Page
   ============================================ */

:root {
  --red: #e01020;
  --red-glow: rgba(224, 16, 32, 0.35);
  --red-subtle: rgba(224, 16, 32, 0.08);
  --white: #f0f0f0;
  --gray-100: #c8c8c8;
  --gray-200: #888;
  --gray-300: #444;
  --bg-deep: #0a0a0a;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.12);
  --font-display: 'Syne', sans-serif;
  --font-body: 'DM Sans', sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-font-smoothing: antialiased; }

body {
  font-family: var(--font-body);
  background: var(--bg-deep);
  color: var(--white);
  overflow-x: hidden;
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }

/* ---------- Snow & Grain ---------- */
#snow-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.5;
}

.grain-overlay {
  position: fixed;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  pointer-events: none;
  z-index: 999;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem 2.5rem;
  backdrop-filter: blur(20px);
  background: rgba(10, 10, 10, 0.7);
  border-bottom: 1px solid var(--border);
}

.nav-back {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--gray-200);
  transition: color 0.3s var(--ease);
}

.nav-back:hover { color: var(--white); }

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
}

.nav-icon {
  width: 20px;
  height: 20px;
  filter: invert(1);
  animation: float 4s ease-in-out infinite;
}

/* ---------- Page Header ---------- */
.page-header {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 8rem 2rem 3rem;
}

.section-label {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--red);
  margin-bottom: 1rem;
  opacity: 0;
  animation: fadeUp 0.8s var(--ease) 0.1s forwards;
}

.page-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 1rem;
  opacity: 0;
  animation: fadeUp 0.8s var(--ease) 0.25s forwards;
}

.page-subtitle {
  font-size: 1rem;
  font-weight: 300;
  color: var(--gray-200);
  letter-spacing: 0.02em;
  opacity: 0;
  animation: fadeUp 0.8s var(--ease) 0.4s forwards;
}

/* ---------- Grid ---------- */
.grid-section {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 2rem 4rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
}

/* ---------- Download Cards ---------- */
.dl-card {
  position: relative;
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  background: var(--bg-card);
  transition: all 0.4s var(--ease);
  cursor: pointer;
  opacity: 0;
  transform: translateY(30px);
}

.dl-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.dl-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-5px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}

.dl-image {
  position: relative;
  overflow: hidden;
  height: 180px;
}

.dl-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease), filter 0.4s var(--ease);
}

.dl-card:hover .dl-image img {
  transform: scale(1.08);
  filter: brightness(0.6);
}

.dl-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(10, 10, 10, 0.7) 0%, transparent 50%);
  pointer-events: none;
}

.dl-icon-wrap {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.4s var(--ease);
  z-index: 2;
}

.dl-card:hover .dl-icon-wrap {
  opacity: 1;
}

.dl-icon {
  color: var(--white);
  background: var(--red);
  padding: 14px;
  border-radius: 50%;
  width: 52px;
  height: 52px;
  transition: transform 0.3s var(--ease);
}

.dl-card:hover .dl-icon {
  transform: scale(1.1);
}

.dl-info {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 1.2rem 1.4rem;
}

.dl-id {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--red);
  font-family: var(--font-display);
}

.dl-name {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  flex: 1;
}

.dl-source {
  font-size: 0.7rem;
  color: var(--gray-300);
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

/* ---------- Footer ---------- */
.footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 2rem;
  font-size: 0.8rem;
  color: var(--gray-300);
  border-top: 1px solid var(--border);
}

/* ---------- Animations ---------- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-3px); }
}

/* ---------- Responsive ---------- */
@media (max-width: 600px) {
  .nav { padding: 1rem 1.2rem; }
  .page-header { padding: 7rem 1.5rem 2rem; }
  .grid-section { padding: 1.5rem 1.2rem 3rem; }
  .grid { grid-template-columns: 1fr; gap: 1.2rem; }
  .dl-image { height: 160px; }
}