/* ═══════════════════════════════════════════
   SKILLS — 2×2 tilt card grid
═══════════════════════════════════════════ */

#skills {
  padding: 80px 0;
}

.skills-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(1.2rem, 5vw, 3rem);
}

.skills-intro { margin-bottom: 3rem; }

/* ─── Grid ─── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.2rem;
}

/* ─── Card shell (perspective host) ─── */
.sg-card {
  perspective: 900px;
}

/* ─── Card face ─── */
.sg-card-inner {
  position: relative;
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 2.2rem 2.4rem 2rem;
  border: 1px solid rgba(255,255,255,0.07);
  overflow: hidden;
  transform-style: preserve-3d;
  will-change: transform;
  /* transition is managed by JS during enter/leave */
  transition: border-color 0.35s ease, box-shadow 0.35s ease;
}

.sg-card:hover .sg-card-inner {
  border-color: color-mix(in srgb, var(--clr) 40%, transparent);
  box-shadow: 0 16px 60px color-mix(in srgb, var(--clr) 18%, transparent);
}

/* ─── Large ghost number ─── */
.sg-num {
  position: absolute;
  top: -0.6rem;
  right: 0.8rem;
  font-family: var(--font-sans);
  font-size: 7rem;
  font-weight: 900;
  color: var(--clr);
  opacity: 0.055;
  line-height: 1;
  pointer-events: none;
  user-select: none;
  transition: opacity 0.35s ease;
}

.sg-card:hover .sg-num {
  opacity: 0.13;
}

/* ─── Badge + title ─── */
.sg-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr);
  background: color-mix(in srgb, var(--clr) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--clr) 28%, transparent);
  padding: 0.2rem 0.65rem;
  border-radius: 4px;
  margin-bottom: 0.55rem;
}

.sg-header { margin-bottom: 0.85rem; }

.sg-card-inner h3 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  line-height: 1.2;
}

.sg-card-inner p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.72;
  margin-bottom: 1.4rem;
}

/* ─── Tech tags ─── */
.sg-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
}

.sg-tech li {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--clr);
  background: color-mix(in srgb, var(--clr) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--clr) 20%, transparent);
  padding: 0.22rem 0.65rem;
  border-radius: 4px;
  /* stagger-in animation — triggered when .sg-visible added by JS */
  opacity: 0;
  transform: translateY(8px);
  transition:
    opacity    0.35s ease calc(var(--i) * 55ms),
    transform  0.35s ease calc(var(--i) * 55ms),
    background 0.2s  ease,
    border-color 0.2s ease;
}

.sg-card.sg-visible .sg-tech li {
  opacity: 1;
  transform: translateY(0);
}

.sg-tech li:hover {
  background: color-mix(in srgb, var(--clr) 18%, transparent);
  border-color: color-mix(in srgb, var(--clr) 45%, transparent);
}

/* ─── Responsive ─── */
@media (max-width: 720px) {
  .skills-grid { grid-template-columns: 1fr; }
  .sg-card-inner { padding: 1.6rem 1.8rem 1.4rem; }
  .sg-card-inner h3 { font-size: 1.1rem; }
  /* disable tilt on touch */
  .sg-card-inner { transform: none !important; }
}

@media (max-width: 640px) {
  #skills { padding-top: 60px; }
}