/* =========================================
   PRIYANSHU KUMAR — PORTFOLIO
   3D Layer — v2 (fixed spacing + new animations)
   ========================================= */

/* ─────────────────────────────────────────
   1. THREE.JS HERO CANVAS
───────────────────────────────────────── */
#three-hero {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.9;
}

#hero {
  position: relative;
  overflow: hidden;
}

#hero .container {
  position: relative;
  z-index: 2;
}

/* ─────────────────────────────────────────
   2. PROJECTS GRID — 2 columns
───────────────────────────────────────── */
.projects-grid {
  grid-template-columns: repeat(2, 1fr) !important;
  gap: 24px !important;
}

@media (max-width: 768px) {
  .projects-grid {
    grid-template-columns: 1fr !important;
  }
}

/* ─────────────────────────────────────────
   3. 3D FLIP CARD — PROJECT CARDS
   CRITICAL: Fixed height on outer wrapper so
   position:absolute faces don't collapse parent
───────────────────────────────────────── */
.proj-card-3d {
  perspective: 1000px;
  cursor: pointer;
  height: 480px;          /* explicit height — prevents section gaps */
}

.proj-card-3d.proj-featured {
  height: 520px;
}

.proj-card-inner {
  position: relative;
  width: 100%;
  height: 100%;            /* fill the explicit parent height */
  transform-style: preserve-3d;
  transition: transform 0.75s cubic-bezier(0.4, 0.2, 0.2, 1);
  border-radius: 16px;
}

.proj-card-3d:hover .proj-card-inner,
.proj-card-3d.flipped .proj-card-inner {
  transform: rotateY(180deg);
}

.proj-card-front,
.proj-card-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 16px;
  overflow: hidden;
}

/* Front face */
.proj-card-front {
  background: rgba(10, 14, 26, 0.85);
  border: 1px solid rgba(0, 245, 255, 0.12);
  transform: rotateY(0deg);
  display: flex;
  flex-direction: column;
}

/* Restore proj-arrow visibility inside flip card */
.proj-card-front .proj-arrow {
  opacity: 0;
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.proj-card-3d:hover .proj-card-front .proj-arrow {
  opacity: 1;
  transform: translate(4px, -4px);
}

/* Back face */
.proj-card-back {
  background: linear-gradient(135deg, #020c1a 0%, #0d0a1e 50%, #050810 100%);
  border: 1px solid rgba(168, 85, 247, 0.35);
  transform: rotateY(180deg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px 28px;
  gap: 16px;
  text-align: center;
}

.proj-card-back::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, rgba(168, 85, 247, 0.15) 0%, transparent 70%),
    radial-gradient(ellipse 60% 50% at 50% 100%, rgba(0, 245, 255, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.back-icon {
  font-size: 3rem;
  filter: drop-shadow(0 0 16px rgba(168, 85, 247, 0.6));
  animation: floatIcon 3s ease-in-out infinite;
}

@keyframes floatIcon {
  0%, 100% { transform: translateY(0) rotate(-3deg); }
  50%       { transform: translateY(-10px) rotate(3deg); }
}

.back-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1rem;
  font-weight: 700;
  color: #e2e8f0;
  letter-spacing: 1px;
}

.back-desc {
  font-size: 0.8rem;
  color: rgba(226, 232, 240, 0.65);
  line-height: 1.7;
  max-width: 280px;
}

.back-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
}

.back-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.62rem;
  padding: 3px 9px;
  border-radius: 4px;
  background: rgba(168, 85, 247, 0.15);
  border: 1px solid rgba(168, 85, 247, 0.3);
  color: rgba(168, 85, 247, 0.9);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: 8px;
  background: linear-gradient(135deg, rgba(0, 245, 255, 0.15), rgba(168, 85, 247, 0.15));
  border: 1px solid rgba(0, 245, 255, 0.4);
  color: #00f5ff;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-decoration: none;
  transition: all 0.3s ease;
  position: relative;
  z-index: 1;
}

.back-link:hover {
  background: linear-gradient(135deg, rgba(0, 245, 255, 0.25), rgba(168, 85, 247, 0.25));
  box-shadow: 0 0 24px rgba(0, 245, 255, 0.3);
  transform: translateY(-2px);
}

.back-link-disabled {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: 8px;
  background: rgba(30, 30, 50, 0.6);
  border: 1px solid rgba(255,255,255,0.1);
  color: rgba(226,232,240,0.35);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 1px;
  cursor: not-allowed;
}

.back-flip-hint,
.front-flip-hint {
  position: absolute;
  bottom: 12px;
  right: 16px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.58rem;
  color: rgba(0, 245, 255, 0.45);
  letter-spacing: 1px;
  display: flex;
  align-items: center;
  gap: 4px;
  animation: hintPulse 2.5s ease-in-out infinite;
  pointer-events: none;
}

@keyframes hintPulse {
  0%, 100% { opacity: 0.4; }
  50%       { opacity: 1; }
}

/* ─────────────────────────────────────────
   4. 3D TILT CARD (shine overlay)
───────────────────────────────────────── */
.tilt-shine {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(
    ellipse 120px 120px at var(--tx, 50%) var(--ty, 50%),
    rgba(255, 255, 255, 0.07) 0%,
    transparent 70%
  );
  pointer-events: none;
  z-index: 2;
  opacity: 0;
  transition: opacity 0.3s;
}

/* ─────────────────────────────────────────
   5. 3D TEXT — section titles
───────────────────────────────────────── */
.text-3d {
  display: inline-block;
  text-shadow:
    1px 1px 0  rgba(0, 245, 255, 0.5),
    2px 2px 0  rgba(0, 245, 255, 0.4),
    3px 3px 0  rgba(0, 245, 255, 0.3),
    4px 4px 0  rgba(0, 245, 255, 0.2),
    5px 5px 8px rgba(0, 0, 0, 0.5);
  transition: text-shadow 0.3s ease, transform 0.3s ease;
}

.text-3d:hover {
  text-shadow:
    2px 2px 0  rgba(0, 245, 255, 0.6),
    4px 4px 0  rgba(0, 245, 255, 0.45),
    6px 6px 0  rgba(0, 245, 255, 0.3),
    8px 8px 16px rgba(0, 0, 0, 0.6);
  transform: translateY(-2px);
}

/* ─────────────────────────────────────────
   6. 3D SKILLS SPHERE
───────────────────────────────────────── */
.skills-sphere-wrap {
  width: 100%;
  min-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 16px;
}

#skills-sphere {
  position: relative;
  width: 300px;
  height: 300px;
  transform-style: preserve-3d;
  cursor: grab;
}

#skills-sphere:active { cursor: grabbing; }

.sphere-tag {
  position: absolute;
  top: 50%;
  left: 50%;
  padding: 5px 12px;
  border-radius: 20px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  font-weight: 600;
  white-space: nowrap;
  letter-spacing: 0.5px;
  transform-style: preserve-3d;
  cursor: default;
  transition: background 0.3s, color 0.3s;
}

.sphere-tag.side-front {
  background: rgba(0, 245, 255, 0.15);
  border: 1px solid rgba(0, 245, 255, 0.45);
  color: rgba(0, 245, 255, 0.95);
  text-shadow: 0 0 10px rgba(0, 245, 255, 0.5);
}
.sphere-tag.side-mid {
  background: rgba(168, 85, 247, 0.12);
  border: 1px solid rgba(168, 85, 247, 0.35);
  color: rgba(168, 85, 247, 0.9);
}
.sphere-tag.side-back {
  background: rgba(30, 30, 60, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.06);
  color: rgba(226, 232, 240, 0.2);
}

/* ─────────────────────────────────────────
   7. 3D CERT CARD FLIP
   Fixed height to avoid collapse
───────────────────────────────────────── */
.cert-card-3d {
  perspective: 1000px;
  cursor: pointer;
  height: 340px;
}

.cert-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.7s cubic-bezier(0.4, 0.2, 0.2, 1);
  border-radius: 16px;
}

.cert-card-3d:hover .cert-card-inner,
.cert-card-3d.flipped .cert-card-inner {
  transform: rotateY(180deg);
}

.cert-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 16px;
  overflow: hidden;
}

.cert-face-front  { transform: rotateY(0deg); }

.cert-face-back {
  transform: rotateY(180deg);
  background: linear-gradient(135deg, #020c1a, #0d0a1e);
  border: 1px solid rgba(0, 245, 255, 0.2);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 28px 24px;
  gap: 12px;
  text-align: center;
}

.cert-face-back .cb-seal  { font-size: 2.8rem; animation: floatIcon 3s ease-in-out infinite; }
.cert-face-back .cb-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  font-weight: 700;
  color: #e2e8f0;
  line-height: 1.4;
}
.cert-face-back .cb-issuer { font-size: 0.72rem; color: rgba(0, 245, 255, 0.7); font-family: 'JetBrains Mono', monospace; }
.cert-face-back .cb-date   { font-size: 0.68rem; color: rgba(226, 232, 240, 0.4); }
.cert-face-back .cb-actions { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; margin-top: 6px; }

/* ─────────────────────────────────────────
   8. HERO STATS 3D
───────────────────────────────────────── */
.h-stat {
  transform-style: preserve-3d;
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.h-stat:hover {
  transform: perspective(400px) translateZ(20px) scale(1.08);
}

/* ─────────────────────────────────────────
   9. STATS SECTION — 3D metric cards
───────────────────────────────────────── */

/* gh-metric tiles pop forward */
.gh-metric {
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.35s ease;
  border-radius: 10px;
}
.gh-metric:hover {
  transform: perspective(400px) translateZ(16px) scale(1.06);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 16px rgba(0, 245, 255, 0.15);
}

/* LeetCode ring 3D tilt container */
.leet-ring {
  transition: transform 0.4s ease;
}
.gh-card:hover .leet-ring {
  transform: perspective(500px) rotateY(-8deg) rotateX(4deg);
}

/* TUF total number pop */
.tuf-total-num {
  display: inline-block;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.gh-card:hover .tuf-total-num {
  transform: perspective(300px) translateZ(20px) scale(1.1);
}

/* Floating glow orb behind stats section */
#stats {
  position: relative;
}

#stats::before {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 245, 255, 0.05) 0%, transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  animation: statOrb 8s ease-in-out infinite;
  z-index: 0;
}

@keyframes statOrb {
  0%, 100% { transform: translate(-50%, -50%) scale(1);   opacity: 0.6; }
  50%       { transform: translate(-50%, -50%) scale(1.2); opacity: 1;   }
}

.stats-grid { position: relative; z-index: 1; }

/* ─────────────────────────────────────────
   10. CONTACT SECTION — full 3D treatment
───────────────────────────────────────── */

/* Perspective wrapper on the contact section */
#contact {
  position: relative;
}

/* 3D rotating ring behind the contact heading */
#contact .contact-inner {
  position: relative;
}

#contact .contact-inner::before {
  content: '';
  position: absolute;
  width: 320px;
  height: 320px;
  top: -60px;
  left: 50%;
  margin-left: -160px;
  border-radius: 50%;
  border: 1px solid rgba(0, 245, 255, 0.08);
  animation: contactRingA 12s linear infinite;
  pointer-events: none;
  z-index: 0;
}

#contact .contact-inner::after {
  content: '';
  position: absolute;
  width: 220px;
  height: 220px;
  top: -10px;
  left: 50%;
  margin-left: -110px;
  border-radius: 50%;
  border: 1px solid rgba(168, 85, 247, 0.1);
  animation: contactRingA 8s linear infinite reverse;
  pointer-events: none;
  z-index: 0;
}

@keyframes contactRingA {
  from { transform: rotate(0deg) rotateX(60deg); }
  to   { transform: rotate(360deg) rotateX(60deg); }
}

/* Contact cards 3D */
.contact-card {
  position: relative;
  transition:
    transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1),
    box-shadow 0.4s ease,
    border-color 0.4s ease;
  overflow: hidden;
}

.contact-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0,245,255,0.05), transparent 60%);
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
}

.contact-card:hover {
  transform: perspective(600px) translateZ(20px) translateY(-8px) rotateX(4deg);
  box-shadow:
    0 24px 60px rgba(0, 0, 0, 0.5),
    0 0 40px rgba(0, 245, 255, 0.12),
    inset 0 1px 0 rgba(0, 245, 255, 0.2);
  border-color: rgba(0, 245, 255, 0.35) !important;
}

.contact-card:hover::before { opacity: 1; }

/* Icon lift on contact card hover */
.c-icon {
  display: inline-block;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), filter 0.4s ease;
}

.contact-card:hover .c-icon {
  transform: perspective(300px) translateZ(12px) scale(1.2);
  filter: drop-shadow(0 0 12px rgba(0, 245, 255, 0.5));
}

/* Contact section — 3D depth beam that sweeps */
.contact-cards {
  position: relative;
}

.contact-cards::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 60px;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(0, 245, 255, 0.04), transparent);
  animation: contactBeam 5s ease-in-out infinite;
  pointer-events: none;
}

@keyframes contactBeam {
  0%   { left: -10%; }
  100% { left: 110%; }
}

/* Resume button 3D pop */
.resume-dl {
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.4s ease;
}

.resume-dl:hover {
  transform: perspective(400px) translateZ(16px) translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 245, 255, 0.2);
}

/* ─────────────────────────────────────────
   11. MARQUEE items
───────────────────────────────────────── */
.marquee-item {
  transition: transform 0.3s ease, color 0.3s ease;
}
.marquee-item:hover {
  transform: perspective(200px) translateZ(10px) scale(1.06);
  color: #00f5ff;
  text-shadow: 0 0 16px rgba(0, 245, 255, 0.5);
}

/* ─────────────────────────────────────────
   12. FOOTER 3D
───────────────────────────────────────── */
footer.in-view {
  animation: footerRise 0.8s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes footerRise {
  from { transform: translateY(10px); opacity: 0.5; }
  to   { transform: translateY(0);    opacity: 1; }
}

/* ─────────────────────────────────────────
   13. SECTION SPACING FIX
   Eliminate phantom gaps caused by flip cards
───────────────────────────────────────── */

/* Remove any body-level perspective that breaks layout */
body { perspective: none !important; }

/* Clamp section padding so it doesn't stack with transform gaps */
.sec {
  padding-top: 80px !important;
  padding-bottom: 80px !important;
}

/* Remove the tilted grid-bg that was adding visual height */
.grid-bg {
  transform: none !important;
}

/* ─────────────────────────────────────────
   14. RESPONSIVE — reduce 3D on mobile
───────────────────────────────────────── */
@media (max-width: 768px) {
  .proj-card-3d        { height: auto; min-height: 420px; }
  .proj-card-3d:hover .proj-card-inner { transform: none; }
  .proj-card-3d.flipped .proj-card-inner { transform: rotateY(180deg); }

  .cert-card-3d        { height: auto; min-height: 280px; }
  .cert-card-3d:hover .cert-card-inner { transform: none; }
  .cert-card-3d.flipped .cert-card-inner { transform: rotateY(180deg); }

  #skills-sphere { width: 240px; height: 240px; }

  #contact .contact-inner::before,
  #contact .contact-inner::after { display: none; }
}