/* ============================================
   SNKRS 3D — Scroll-driven 3D Storytelling
   v2 — BIG model, smooth, cinematic
   ============================================ */

:root {
  --bg: #08080c;
  --text: #f0f0f5;
  --text-dim: #6a6a8a;
  --accent: #7c5cff;
  --accent2: #ff6b9d;
  --accent3: #00e5ff;
  --accent-glow: rgba(124, 92, 255, 0.25);
  --glass: rgba(255, 255, 255, 0.04);
  --border: rgba(255, 255, 255, 0.07);
  --font: 'Space Grotesk', system-ui, sans-serif;
}

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

html { scrollbar-width: thin; scrollbar-color: var(--accent) var(--bg); }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Film grain */
.grain {
  position: fixed;
  inset: 0;
  z-index: 1000;
  pointer-events: none;
  opacity: 0.03;
  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='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-size: 128px;
}

/* ============ FIXED 3D MODEL — BIG ============ */
.model-container {
  position: fixed;
  inset: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.model-container model-viewer {
  width: 100vw;
  height: 100vh;
  pointer-events: auto;
  --poster-color: transparent;
}

.model-container model-viewer::part(default-progress-bar) {
  background: var(--accent);
  height: 3px;
}

/* ============ SCROLL CONTAINER ============ */
.scroll-container {
  position: relative;
  z-index: 5;
  pointer-events: none;
}

.panel {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding: 4rem 5rem;
  pointer-events: none;
}

.panel-content {
  pointer-events: auto;
  max-width: 480px;
  opacity: 0;
  transform: translateY(50px) scale(0.97);
  transition: opacity 1s cubic-bezier(0.16, 1, 0.3, 1),
              transform 1s cubic-bezier(0.16, 1, 0.3, 1);
}

.panel-content.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.panel-left { margin-right: auto; }
.panel-right { margin-left: auto; }
.panel-center { margin: 0 auto; text-align: center; }

/* Glassmorphism card behind text */
.panel-content::before {
  content: '';
  position: absolute;
  inset: -2rem;
  background: rgba(8, 8, 12, 0.7);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  border-radius: 24px;
  border: 1px solid var(--border);
  z-index: -1;
}

.panel-content { position: relative; padding: 0.5rem; }

/* ============ HERO PANEL ============ */
.hero-panel { padding-top: 15vh; }

.hero-badge {
  display: inline-block;
  padding: 0.5rem 1.4rem;
  background: rgba(124, 92, 255, 0.1);
  border: 1px solid rgba(124, 92, 255, 0.3);
  border-radius: 50px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--accent);
  margin-bottom: 1.5rem;
  text-shadow: 0 0 20px var(--accent-glow);
}

.hero-title {
  font-size: clamp(3.5rem, 8vw, 6.5rem);
  font-weight: 700;
  line-height: 0.95;
  margin-bottom: 1.5rem;
  letter-spacing: -2px;
}

.hero-title span { display: block; }

.accent-gradient {
  background: linear-gradient(135deg, var(--accent), var(--accent2), var(--accent3));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% 200%;
  animation: gradientShift 8s ease infinite;
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-dim);
  line-height: 1.7;
  margin-bottom: 2rem;
  max-width: 380px;
}

.scroll-indicator {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--text-dim);
  font-size: 0.75rem;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.scroll-arrow {
  width: 26px;
  height: 44px;
  border: 2px solid rgba(255,255,255,0.15);
  border-radius: 13px;
  position: relative;
}

.scroll-arrow::after {
  content: '';
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 10px;
  background: var(--accent);
  border-radius: 2px;
  animation: scrollBounce 2.5s ease infinite;
}

@keyframes scrollBounce {
  0%, 100% { top: 8px; opacity: 1; }
  60% { top: 24px; opacity: 0.2; }
}

/* ============ PANEL TYPOGRAPHY ============ */
.panel-tag {
  display: inline-block;
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 1.2rem;
  position: relative;
  padding-left: 2.5rem;
}

.panel-tag::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 2rem;
  height: 1px;
  background: var(--accent);
}

.panel-title {
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.05;
  margin-bottom: 1.2rem;
  letter-spacing: -1px;
}

.panel-title.centered { text-align: center; }
.panel-title.mega { font-size: clamp(3.5rem, 7vw, 6rem); letter-spacing: -3px; }

.panel-desc {
  font-size: 1.05rem;
  color: var(--text-dim);
  line-height: 1.75;
  margin-bottom: 1.5rem;
}

.panel-desc.centered { text-align: center; max-width: 520px; margin: 0 auto 1.5rem; }

/* Highlight words */
.text-highlight {
  color: var(--text);
  font-weight: 600;
}

/* Stats */
.stat-row {
  display: flex;
  gap: 3rem;
  margin-top: 1.5rem;
}

.mini-stat { display: flex; flex-direction: column; gap: 0.3rem; }

.mini-stat-val {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--text), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.mini-stat-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--text-dim);
}

/* Pills */
.feature-pills {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}

.pill {
  padding: 0.5rem 1.2rem;
  background: rgba(124, 92, 255, 0.08);
  border: 1px solid rgba(124, 92, 255, 0.2);
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  transition: all 0.4s;
}

.pill:hover {
  background: rgba(124, 92, 255, 0.2);
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px var(--accent-glow);
}

/* Color picker */
.color-picker {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
}

.color-swatch {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 3px solid transparent;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
}

.color-swatch:hover { transform: scale(1.2); }

.color-swatch.active {
  border-color: white;
  box-shadow: 0 0 24px var(--accent-glow);
  transform: scale(1.2);
}

.color-swatch-label {
  position: absolute;
  bottom: -24px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.55rem;
  font-weight: 600;
  color: var(--text-dim);
  letter-spacing: 1px;
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.3s;
  text-transform: uppercase;
}

.color-swatch:hover .color-swatch-label,
.color-swatch.active .color-swatch-label { opacity: 1; }

/* CTA */
.cta-panel { padding-bottom: 10rem; }

.cta-group {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin: 2.5rem 0;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 2.2rem;
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  border-radius: 14px;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  border: none;
}

.btn-lg { padding: 1.1rem 2.8rem; font-size: 1.05rem; }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #9b7aff);
  color: white;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 40px rgba(124, 92, 255, 0.4);
}

.btn-ghost {
  background: var(--glass);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  background: rgba(255,255,255,0.08);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.cta-footer {
  display: flex;
  gap: 0.6rem;
  justify-content: center;
  margin-top: 2.5rem;
  flex-wrap: wrap;
}

.tech-tag {
  padding: 0.4rem 1rem;
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: 50px;
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 500;
}

.credits {
  margin-top: 2rem;
  font-size: 0.7rem;
  color: rgba(255,255,255,0.2);
  text-align: center;
}

/* ============ PROGRESS BAR ============ */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent2), var(--accent3));
  z-index: 9999;
  width: 0%;
  /* no transition — updated every frame */
}

/* ============ NAV DOTS ============ */
.nav-dots {
  position: fixed;
  right: 2rem;
  top: 50%;
  transform: translateY(-50%);
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.nav-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.12);
  border: none;
  cursor: pointer;
  transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  padding: 0;
}

.nav-dot:hover { background: var(--text-dim); transform: scale(1.5); }

.nav-dot.active {
  background: var(--accent);
  box-shadow: 0 0 14px var(--accent-glow);
  transform: scale(1.5);
  height: 24px;
  border-radius: 4px;
}

/* ============ BACKGROUND GLOWS ============ */
.panel:nth-child(odd)::after {
  content: '';
  position: absolute;
  top: 10%;
  right: -15%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(124, 92, 255, 0.06) 0%, transparent 60%);
  pointer-events: none;
}

.panel:nth-child(even)::after {
  content: '';
  position: absolute;
  bottom: 10%;
  left: -15%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255, 107, 157, 0.05) 0%, transparent 60%);
  pointer-events: none;
}

/* ============ RESPONSIVE ============ */
@media (max-width: 768px) {
  .panel { padding: 3rem 1.5rem; }
  .panel-content { max-width: 100%; }
  .panel-content::before { inset: -1.2rem; border-radius: 16px; }
  .panel-left, .panel-right { margin: auto; text-align: center; }
  .stat-row { justify-content: center; }
  .feature-pills { justify-content: center; }
  .color-picker { justify-content: center; }
  .hero-title { font-size: clamp(2.8rem, 10vw, 4rem); }
  .nav-dots { right: 0.8rem; }
  .hero-panel { padding-top: 8vh; }
}

@media (max-width: 480px) {
  .panel-title { font-size: clamp(1.8rem, 7vw, 2.8rem); }
  .hero-title { font-size: clamp(2.2rem, 9vw, 3.5rem); }
}