/* ── Variables ── */
:root {
  --header-bg: #000000;
  --dark-grey: #2b2b2b;
  --dark-grey-deep: #1f1f1f;
  --light-grey: #d4d4d4;
  --light-grey-soft: #e8e8e8;
  --accent: #1565c0;
  --accent-dim: #0d47a1;
  --accent-glow: rgba(21, 101, 192, 0.45);
  --text-on-dark: #c8c8c8;
  --text-on-light: #333;
  --text-muted: #666;
  --card-border: #bbb;
  --tag-circuits: #e8a838;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--light-grey);
  color: var(--text-on-light);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

/* ── Header / Nav ── */
.site-header {
  background: var(--header-bg);
  border-bottom: 2px solid var(--accent-dim);
  position: sticky;
  top: 0;
  z-index: 100;
  overflow: hidden;
  padding: 2rem 2.5rem;
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  width: 100%;
}

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 2.5rem;
  flex-shrink: 0;
}

.nav-link {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.95rem;
  text-transform: lowercase;
  letter-spacing: 0.08em;
  color: var(--text-on-dark);
  padding: 0.3rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.nav-link:hover,
.nav-link.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.binary-bg {
  position: absolute;
  inset: 0;
  opacity: 0.06;
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 18px,
      rgba(21, 101, 192, 0.4) 18px,
      rgba(21, 101, 192, 0.4) 19px
    );
  font-family: 'Share Tech Mono', monospace;
  pointer-events: none;
}

.binary-bg::after {
  content: '01010101 11001100 10101010 00110011 11110000 01010101 11001100 10101010';
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  transform: translateY(-50%);
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.15em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: clip;
}

.title-block {
  flex: 1;
  min-width: 0;
}

.site-title {
  font-family: 'Share Tech Mono', monospace;
  font-size: clamp(2.4rem, 6.5vw, 4.5rem);
  font-weight: 400;
  color: var(--accent);
  line-height: 1.1;
  text-align: left;
  text-shadow: 0 0 24px var(--accent-glow);
}

.site-tagline {
  font-family: 'Share Tech Mono', monospace;
  font-size: clamp(0.75rem, 1.8vw, 0.95rem);
  color: var(--text-on-dark);
  opacity: 0.75;
  margin-top: 0.5rem;
  letter-spacing: 0.03em;
  font-style: italic;
}

/* ── Content Area ── */
.content {
  flex: 1;
  background: var(--light-grey);
  padding: 3rem 1.5rem 4rem;
}

.cards-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  max-width: 900px;
  margin: 0 auto;
}

/* ── Flashcard ── */
.flashcard {
  display: block;
  background: var(--light-grey-soft);
  border: 1px solid var(--card-border);
  border-radius: 4px;
  overflow: hidden;
  flex: 1 1 min(100%, 420px);
  max-width: 420px;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  cursor: pointer;
}

.flashcard:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow:
    0 0 0 2px var(--accent),
    0 0 18px var(--accent-glow),
    0 12px 32px rgba(13, 71, 161, 0.3);
}

.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.6rem 0.85rem;
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.68rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--card-border);
}

.card-author {
  color: var(--accent-dim);
}

.category-tag {
  display: inline-block;
  margin: 0.6rem 0.85rem 0;
  padding: 0.15rem 0.55rem;
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-radius: 3px;
  border: 1px solid;
}

.category-tag.circuits {
  color: var(--tag-circuits);
  border-color: var(--tag-circuits);
  background: rgba(232, 168, 56, 0.1);
}

.hit-stat {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 0.55rem;
  border-radius: 999px;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.hit-stat.heat-low {
  color: var(--text-muted);
  background: rgba(0, 0, 0, 0.04);
}

.hit-stat.heat-medium {
  color: #e09b00;
  background: rgba(224, 155, 0, 0.12);
}

.hit-stat.heat-high {
  color: #d32f2f;
  background: rgba(211, 47, 47, 0.15);
}

.hit-stat svg {
  width: 16px;
  height: 16px;
}

/* ── Card Image + Stencil Title ── */
.card-image {
  margin: 0.75rem 0.85rem 0;
  border-radius: 3px;
  overflow: hidden;
  border: 1px solid #999;
}

.card-image-inner {
  position: relative;
  height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: #1a1a1a;
}

.card-thumbnail {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.card-image-shade {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(0, 0, 0, 0.55) 0%,
    rgba(0, 0, 0, 0.15) 45%,
    rgba(0, 0, 0, 0.1) 100%
  );
  pointer-events: none;
}

.card-overlay-title {
  position: relative;
  z-index: 2;
  font-family: 'Black Ops One', 'Impact', sans-serif;
  font-size: clamp(1.5rem, 5vw, 2rem);
  font-weight: 400;
  text-transform: uppercase;
  text-align: center;
  line-height: 1.1;
  color: #fff;
  letter-spacing: 0.04em;
  /* Stencil outline effect matching reference thumbnails */
  -webkit-text-stroke: 1.5px rgba(180, 40, 40, 0.85);
  paint-order: stroke fill;
  text-shadow:
    2px 2px 0 rgba(0, 0, 0, 0.5),
    0 0 12px rgba(255, 255, 255, 0.15);
  padding: 0 1rem;
}

/* ── Card Body ── */
.card-body {
  padding: 0.85rem;
}

.card-title {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.95rem;
  color: var(--accent-dim);
  margin-bottom: 0.5rem;
}

.card-desc {
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.card-stats {
  display: flex;
  gap: 1rem;
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.stat {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.stat svg {
  opacity: 0.6;
}

/* ── About Section ── */
.about-section {
  background: var(--light-grey);
  padding: 3.5rem 1.5rem 2rem;
}

.about-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 1rem 0;
}

.about-inner h2 {
  font-family: 'Share Tech Mono', monospace;
  font-size: clamp(2rem, 4vw, 2.6rem);
  color: var(--accent);
  letter-spacing: 0.16em;
  margin-bottom: 1rem;
  text-transform: uppercase;
}

.about-inner p {
  font-size: 1rem;
  line-height: 1.85;
  color: #202a36;
  max-width: 74ch;
  margin-bottom: 1.25rem;
}

.about-inner p:last-of-type {
  margin-bottom: 0;
}

/* ── Contact Section ── */
.contact-section {
  background: var(--light-grey);
  padding: 2.5rem 1.5rem 3.5rem;
}

.contact-inner {
  max-width: 900px;
  margin: 0 auto;
}

.contact-inner h2 {
  font-family: 'Share Tech Mono', monospace;
  font-size: clamp(2rem, 4vw, 2.6rem);
  color: var(--accent);
  letter-spacing: 0.16em;
  margin-bottom: 0.9rem;
  text-transform: uppercase;
}

.contact-inner p {
  color: var(--text-muted);
  margin-bottom: 1.75rem;
  max-width: 70ch;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.contact-card {
  display: block;
  background: #d0d0d0;
  border: 1px solid #b8b8b8;
  border-radius: 16px;
  padding: 1.25rem 1.3rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.contact-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 30px rgba(0, 0, 0, 0.08);
}

.contact-card-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.contact-icon {
  width: 1.15rem;
  height: 1.15rem;
  color: #333;
  flex-shrink: 0;
}

.contact-card span {
  display: block;
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #333;
}

.contact-card strong {
  display: block;
  color: #111;
  font-size: 1rem;
  line-height: 1.45;
}

/* ── Footer ── */
.site-footer {
  background: var(--dark-grey);
  color: var(--text-on-dark);
  text-align: center;
  padding: 1.5rem;
  font-size: 0.82rem;
  line-height: 1.7;
  border-top: 2px solid var(--dark-grey-deep);
}

.site-footer a {
  color: var(--accent);
  transition: opacity 0.2s;
}

.site-footer a:hover {
  opacity: 0.8;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .site-header { padding: 1.25rem 1.25rem; }
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  .nav-bar { width: 100%; justify-content: flex-end; gap: 1.5rem; }
  .site-title { font-size: clamp(1.6rem, 7vw, 2.4rem); }
}

@media (max-width: 480px) {
  .card-meta { flex-direction: column; align-items: flex-start; gap: 0.2rem; }
}