/* ============================================
   gzyuans.com - Animations Library
   Tesla-style rich animations
   ============================================ */

/* ===== Reveal Animations ===== */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 1s var(--ease), transform 1s var(--ease);
  will-change: opacity, transform;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-up { transform: translateY(60px); }
.reveal-down { transform: translateY(-60px); }
.reveal-left { transform: translateX(-60px); }
.reveal-right { transform: translateX(60px); }

.reveal-up.is-visible,
.reveal-down.is-visible,
.reveal-left.is-visible,
.reveal-right.is-visible {
  transform: translate(0, 0);
}

/* Stagger children */
.stagger > * {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.stagger.is-visible > *:nth-child(1) { transition-delay: 0.05s; }
.stagger.is-visible > *:nth-child(2) { transition-delay: 0.1s; }
.stagger.is-visible > *:nth-child(3) { transition-delay: 0.15s; }
.stagger.is-visible > *:nth-child(4) { transition-delay: 0.2s; }
.stagger.is-visible > *:nth-child(5) { transition-delay: 0.25s; }
.stagger.is-visible > *:nth-child(6) { transition-delay: 0.3s; }
.stagger.is-visible > *:nth-child(7) { transition-delay: 0.35s; }
.stagger.is-visible > *:nth-child(8) { transition-delay: 0.4s; }
.stagger.is-visible > *:nth-child(9) { transition-delay: 0.45s; }
.stagger.is-visible > *:nth-child(10) { transition-delay: 0.5s; }
.stagger.is-visible > *:nth-child(11) { transition-delay: 0.55s; }
.stagger.is-visible > *:nth-child(12) { transition-delay: 0.6s; }

.stagger.is-visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Text Reveal ===== */
.text-reveal {
  display: inline-block;
  overflow: hidden;
  vertical-align: bottom;
}

.text-reveal > span,
.text-reveal > * {
  display: inline-block;
  transform: translateY(110%);
  transition: transform 1s var(--ease);
}

.text-reveal.is-visible > span,
.text-reveal.is-visible > * {
  transform: translateY(0);
}

.text-reveal-line {
  display: block;
  overflow: hidden;
}

.text-reveal-line > span {
  display: inline-block;
  transform: translateY(120%);
  transition: transform 1.1s var(--ease);
}

.text-reveal-line.is-visible > span {
  transform: translateY(0);
}

/* ===== Fade In Scale ===== */
.fade-scale {
  opacity: 0;
  transform: scale(0.92);
  transition: opacity 1s var(--ease), transform 1s var(--ease);
}

.fade-scale.is-visible {
  opacity: 1;
  transform: scale(1);
}

/* ===== Mask Reveal ===== */
.mask-reveal {
  position: relative;
  overflow: hidden;
}

.mask-reveal::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--color-bg);
  transform-origin: right;
  transition: transform 1.2s var(--ease);
  z-index: 5;
}

.mask-reveal.is-visible::after {
  transform: scaleX(0);
}

/* ===== Floating Animation ===== */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

.float { animation: float 6s ease-in-out infinite; }
.float-slow { animation: float 9s ease-in-out infinite; }
.float-fast { animation: float 4s ease-in-out infinite; }

/* ===== Pulse Glow ===== */
@keyframes pulseGlow {
  0%, 100% {
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
    transform: scale(1);
  }
  50% {
    box-shadow: 0 0 60px rgba(0, 212, 255, 0.6);
    transform: scale(1.03);
  }
}

.pulse-glow { animation: pulseGlow 3s ease-in-out infinite; }

/* ===== Spinning ===== */
@keyframes spin {
  to { transform: rotate(360deg); }
}
.spin { animation: spin 12s linear infinite; }
.spin-slow { animation: spin 30s linear infinite; }
.spin-rev { animation: spin 20s linear infinite reverse; }

/* ===== Glitch ===== */
@keyframes glitch {
  0%, 100% { transform: translate(0); }
  20% { transform: translate(-2px, 2px); }
  40% { transform: translate(-2px, -2px); }
  60% { transform: translate(2px, 2px); }
  80% { transform: translate(2px, -2px); }
}

.glitch:hover { animation: glitch 0.3s steps(2) infinite; }

@keyframes textGlitch {
  0%, 100% { text-shadow: 0 0 0 transparent; }
  25% { text-shadow: -2px 0 0 #00d4ff, 2px 0 0 #ff00aa; }
  50% { text-shadow: 2px 0 0 #00d4ff, -2px 0 0 #7b61ff; }
  75% { text-shadow: -2px 0 0 #7b61ff, 2px 0 0 #00ffa3; }
}

.text-glitch { animation: textGlitch 4s infinite; }

/* ===== Scanline ===== */
@keyframes scanline {
  0% { transform: translateY(-100%); }
  100% { transform: translateY(100vh); }
}

.scanline {
  position: relative;
  overflow: hidden;
}

.scanline::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  box-shadow: 0 0 20px var(--color-accent);
  animation: scanline 4s linear infinite;
  pointer-events: none;
  opacity: 0.6;
}

/* ===== Marquee ===== */
@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

.marquee {
  display: flex;
  overflow: hidden;
  gap: 4rem;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
}

.marquee-track {
  display: flex;
  align-items: center;
  gap: 4rem;
  flex-shrink: 0;
  animation: marquee 40s linear infinite;
}

.marquee:hover .marquee-track { animation-play-state: paused; }

/* ===== Hero Animations ===== */
.hero-title-line {
  display: block;
  overflow: hidden;
}

.hero-title-line > span {
  display: inline-block;
  transform: translateY(110%);
  transition: transform 1.2s var(--ease);
}

.hero-title-line.is-visible > span {
  transform: translateY(0);
}

.hero-title-line:nth-child(1) > span { transition-delay: 0.1s; }
.hero-title-line:nth-child(2) > span { transition-delay: 0.25s; }
.hero-title-line:nth-child(3) > span { transition-delay: 0.4s; }

/* ===== Magnetic Button ===== */
.magnetic {
  transition: transform 0.4s var(--ease);
  will-change: transform;
}

/* ===== Counter Animation ===== */
.counter {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: 'tnum';
}

/* ===== Loading Bar ===== */
@keyframes loadBar {
  0% { width: 0; }
  100% { width: 100%; }
}

.load-bar {
  height: 2px;
  background: var(--grad-primary);
  width: 0;
  animation: loadBar 2s var(--ease) forwards;
}

/* ===== Skew on Hover ===== */
.skew-hover {
  transition: transform 0.6s var(--ease);
  display: inline-block;
}

.skew-hover:hover {
  transform: skewX(-8deg);
}

/* ===== Image Parallax ===== */
.parallax-img {
  transition: transform 1.2s var(--ease);
  will-change: transform;
}

/* ===== Cursor Trail ===== */
.cursor-dot,
.cursor-ring {
  position: fixed;
  top: 0;
  left: 0;
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  mix-blend-mode: difference;
  transform: translate(-50%, -50%);
}

.cursor-dot {
  width: 6px;
  height: 6px;
  background: var(--color-text);
  transition: width 0.3s var(--ease), height 0.3s var(--ease), background 0.3s var(--ease);
}

.cursor-ring {
  width: 36px;
  height: 36px;
  border: 1px solid var(--color-text);
  transition: width 0.4s var(--ease), height 0.4s var(--ease), background 0.4s var(--ease), border-color 0.4s var(--ease);
}

.cursor-ring.hover {
  width: 64px;
  height: 64px;
  background: rgba(0, 212, 255, 0.1);
  border-color: var(--color-accent);
}

@media (max-width: 960px) {
  .cursor-dot, .cursor-ring { display: none; }
}

/* ===== Tilt Card ===== */
.tilt-card {
  transform-style: preserve-3d;
  transition: transform 0.6s var(--ease);
  will-change: transform;
}

.tilt-card .tilt-inner {
  transform: translateZ(40px);
}

/* ===== Animated Gradient Background ===== */
@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.animated-gradient {
  background: linear-gradient(135deg, #00d4ff, #7b61ff, #00ffa3, #00d4ff);
  background-size: 300% 300%;
  animation: gradientShift 8s ease infinite;
}

/* ===== Progress Bar Animation ===== */
@keyframes progressFill {
  from { width: 0; }
}

.progress-fill {
  height: 100%;
  background: var(--grad-primary);
  border-radius: 999px;
  animation: progressFill 1.8s var(--ease) forwards;
  position: relative;
  overflow: hidden;
}

.progress-fill::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
  animation: progressShine 2.4s linear infinite;
}

@keyframes progressShine {
  from { transform: translateX(-100%); }
  to { transform: translateX(100%); }
}

/* ===== Accordion / FAQ ===== */
.accordion-item { border-bottom: 1px solid var(--color-border); }
.accordion-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 0;
  text-align: left;
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  transition: color 0.3s var(--ease);
}
.accordion-trigger:hover { color: var(--color-accent); }
.accordion-trigger .icon {
  transition: transform 0.4s var(--ease);
  width: 24px;
  height: 24px;
}
.accordion-item.open .accordion-trigger .icon { transform: rotate(45deg); }
.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s var(--ease);
}
.accordion-content-inner {
  padding-bottom: 1.5rem;
  color: var(--color-text-dim);
  line-height: 1.7;
}

/* ===== Number Ticker ===== */
.ticker-num {
  font-family: var(--font-mono);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 600;
  color: var(--color-text);
  display: inline-block;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ===== Tabs ===== */
.tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 3rem;
}

.tab-button {
  padding: 0.75rem 1.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-dim);
  border-bottom: 2px solid transparent;
  transition: all 0.3s var(--ease);
  cursor: pointer;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.tab-button:hover { color: var(--color-text); }
.tab-button.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.tab-pane { display: none; animation: fadeIn 0.6s var(--ease); }
.tab-pane.active { display: block; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== Scroll Indicator ===== */
@keyframes scrollHint {
  0% { transform: translateY(0); opacity: 1; }
  100% { transform: translateY(20px); opacity: 0; }
}

.scroll-hint {
  width: 24px;
  height: 40px;
  border: 1px solid var(--color-border-strong);
  border-radius: 999px;
  position: relative;
  display: inline-block;
}

.scroll-hint::after {
  content: '';
  width: 3px;
  height: 8px;
  background: var(--color-text);
  border-radius: 999px;
  position: absolute;
  left: 50%;
  top: 8px;
  transform: translateX(-50%);
  animation: scrollHint 1.6s ease-in-out infinite;
}

/* ===== Code Block ===== */
.code-block {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  overflow-x: auto;
  position: relative;
}

.code-block .line {
  display: block;
  white-space: pre;
  opacity: 0;
  transform: translateX(-8px);
  transition: opacity 0.4s var(--ease), transform 0.4s var(--ease);
}

.code-block .line.is-visible {
  opacity: 1;
  transform: translateX(0);
}

.code-keyword { color: #ff79c6; }
.code-string { color: #f1fa8c; }
.code-comment { color: #6272a4; font-style: italic; }
.code-number { color: #bd93f9; }
.code-fn { color: #50fa7b; }

/* ===== Ripple Hover ===== */
.hover-underline {
  position: relative;
  display: inline-block;
}

.hover-underline::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.5s var(--ease);
}

.hover-underline:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* ===== Notification Toast ===== */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  padding: 1rem 1.5rem;
  background: var(--color-bg-elev);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  z-index: 1000;
  transform: translateY(120%);
  transition: transform 0.6s var(--ease);
  max-width: 360px;
  box-shadow: var(--shadow-lg);
}

.toast.show { transform: translateY(0); }

.toast-icon {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: var(--color-accent);
  color: var(--color-bg);
  flex-shrink: 0;
}

/* ===== Section Title Decoration ===== */
.section-title {
  position: relative;
  display: inline-block;
}

.section-title::before {
  content: '';
  position: absolute;
  top: 50%;
  left: -2rem;
  width: 1rem;
  height: 1px;
  background: var(--color-accent);
  transform: translateY(-50%);
}

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  left: 2rem;
  width: 48px;
  height: 48px;
  border-radius: 999px;
  background: var(--color-bg-elev);
  border: 1px solid var(--color-border);
  display: grid;
  place-items: center;
  z-index: 90;
  opacity: 0;
  pointer-events: none;
  transform: translateY(20px);
  transition: all 0.4s var(--ease);
}

.back-to-top.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-accent);
  color: var(--color-bg);
  border-color: var(--color-accent);
  transform: translateY(-4px);
}

/* ===== Loading State ===== */
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.shimmer {
  background: linear-gradient(90deg,
    var(--color-surface) 0%,
    var(--color-surface-hover) 50%,
    var(--color-surface) 100%);
  background-size: 200% 100%;
  animation: shimmer 2s linear infinite;
}

/* ===== Page Hero ===== */
.page-hero {
  padding: calc(var(--space-16) + 72px) 0 var(--space-12);
  position: relative;
  text-align: center;
  overflow: hidden;
}

.page-hero h1 {
  font-size: clamp(2.5rem, 6vw, 5rem);
  margin-bottom: 1.5rem;
}

.page-hero p {
  max-width: 720px;
  margin: 0 auto;
  font-size: 1.125rem;
}

/* ===== Stat Counter Grid ===== */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

@media (max-width: 768px) { .stat-grid { grid-template-columns: repeat(2, 1fr); } }

.stat-cell {
  background: var(--color-bg);
  padding: 2.5rem 2rem;
  text-align: center;
  transition: background 0.3s var(--ease);
}

.stat-cell:hover { background: var(--color-bg-elev); }

.stat-cell .num {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: block;
  margin-bottom: 0.5rem;
}

.stat-cell .label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-text-dim);
}

/* ===== Feature Lists ===== */
.feature-list {
  display: grid;
  gap: 1.5rem;
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: all 0.4s var(--ease);
}

.feature-item:hover {
  border-color: var(--color-accent);
  background: var(--color-surface-hover);
  transform: translateX(8px);
}

.feature-check {
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  background: var(--color-accent);
  color: var(--color-bg);
  border-radius: 999px;
  flex-shrink: 0;
  margin-top: 0.125rem;
}

.feature-check svg { width: 14px; height: 14px; }

.feature-item h4 {
  font-size: 1.0625rem;
  margin-bottom: 0.375rem;
}

.feature-item p {
  font-size: 0.9375rem;
  color: var(--color-text-dim);
  line-height: 1.6;
}

/* ===== Split Section ===== */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

@media (max-width: 960px) { .split { grid-template-columns: 1fr; gap: 3rem; } }

/* ===== Sticky Side ===== */
.sticky-side {
  position: sticky;
  top: 6rem;
}

/* ===== Timeline ===== */
.timeline {
  position: relative;
  padding-left: 2rem;
  border-left: 1px solid var(--color-border);
}

.timeline-item {
  position: relative;
  padding-bottom: 2.5rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2.375rem;
  top: 0.4rem;
  width: 12px;
  height: 12px;
  background: var(--color-bg);
  border: 2px solid var(--color-accent);
  border-radius: 50%;
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.5);
  transition: transform 0.3s var(--ease);
}

.timeline-item:hover::before { transform: scale(1.4); }

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 0.5rem;
}

.timeline-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.timeline-desc { color: var(--color-text-dim); font-size: 0.9375rem; }

/* ===== Tech Grid Background ===== */
.tech-grid {
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  background-position: -1px -1px;
}

/* ===== Code Rain (decorative) ===== */
.code-rain {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  opacity: 0.08;
}

.code-rain span {
  position: absolute;
  top: -20%;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--color-accent);
  writing-mode: vertical-rl;
  animation: rain linear infinite;
  white-space: nowrap;
}

@keyframes rain {
  from { transform: translateY(0); }
  to { transform: translateY(120vh); }
}