/**
 * Suravi Sehgal — Portfolio Animations & Micro-Interactions
 * Cinematic Neural Boot Sequence, Staggered Hero Entrance & Rich Physics
 */

/* =============================================================
   1. KEYFRAME DEFINITIONS
   ============================================================= */

@keyframes pulse-glow {
  0% {
    box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.6);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(52, 211, 153, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(52, 211, 153, 0);
  }
}

@keyframes float-subtle {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* HUD & Neural Ring Rotations */
@keyframes hudRotateCw {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes hudRotateCcw {
  from {
    transform: rotate(360deg);
  }
  to {
    transform: rotate(0deg);
  }
}

@keyframes corePulse {
  0%, 100% {
    transform: scale(1);
    box-shadow: 0 0 35px rgba(56, 189, 248, 0.7), 0 0 70px rgba(129, 140, 248, 0.4);
  }
  50% {
    transform: scale(1.08);
    box-shadow: 0 0 50px rgba(103, 232, 249, 0.9), 0 0 90px rgba(192, 132, 252, 0.6);
  }
}

@keyframes glowBreathe {
  0% {
    opacity: 0.5;
    transform: scale(0.95);
  }
  100% {
    opacity: 1;
    transform: scale(1.15);
  }
}

@keyframes introGlowPulse {
  0% {
    opacity: 0.6;
    transform: scale(0.98);
  }
  100% {
    opacity: 1;
    transform: scale(1.04);
  }
}

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

@keyframes shimmerTitle {
  0% {
    background-position: 0% center;
  }
  100% {
    background-position: 200% center;
  }
}

/* Hero Staggered Entrance Animations */
@keyframes heroNavEntrance {
  0% {
    transform: translateY(-100%);
    opacity: 0;
  }
  100% {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes heroStatusEntrance {
  0% {
    opacity: 0;
    transform: translateY(18px) scale(0.9);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes heroTitle3DEntrance {
  0% {
    opacity: 0;
    transform: perspective(900px) rotateX(24deg) translateY(42px);
    filter: blur(8px);
  }
  100% {
    opacity: 1;
    transform: perspective(900px) rotateX(0deg) translateY(0);
    filter: blur(0);
  }
}

@keyframes heroFadeSlideUp {
  0% {
    opacity: 0;
    transform: translateY(26px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes heroVisualCardEntrance {
  0% {
    opacity: 0;
    transform: perspective(1000px) rotateY(-12deg) translateY(36px) scale(0.95);
  }
  100% {
    opacity: 1;
    transform: perspective(1000px) rotateY(0deg) translateY(0) scale(1);
  }
}

/* =============================================================
   2. OPENING INTRO / PRELOADER CURTAIN
   ============================================================= */

body.intro-active {
  overflow: hidden !important;
  height: 100vh;
}

.intro-curtain {
  position: fixed;
  inset: 0;
  z-index: 999999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #040711;
  overflow: hidden;
  pointer-events: all;
  perspective: 1000px;
}

/* Dual Shutter Split Doors */
.intro-shutter {
  position: absolute;
  left: 0;
  right: 0;
  width: 100%;
  height: 50.4%;
  background: linear-gradient(180deg, #050814 0%, #03060f 100%);
  z-index: 1;
  pointer-events: none;
  transition: transform 0.82s cubic-bezier(0.77, 0, 0.175, 1);
  will-change: transform;
}

.intro-shutter-top {
  top: 0;
  border-bottom: 1px solid rgba(56, 189, 248, 0.28);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.85);
}

.intro-shutter-bottom {
  bottom: 0;
  border-top: 1px solid rgba(56, 189, 248, 0.28);
  box-shadow: 0 -12px 40px rgba(0, 0, 0, 0.85);
}

/* Exit Transition */
.intro-curtain.intro-finished .intro-shutter-top {
  transform: translateY(-101%);
}

.intro-curtain.intro-finished .intro-shutter-bottom {
  transform: translateY(101%);
}

.intro-curtain.intro-finished .intro-content {
  opacity: 0;
  transform: scale(1.08);
  filter: blur(8px);
  pointer-events: none;
}

.intro-curtain.intro-finished {
  pointer-events: none;
}

/* Ambient Cyber Glow & Background Grid */
.intro-bg-glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 50%, rgba(56, 189, 248, 0.18) 0%, rgba(129, 140, 248, 0.1) 40%, transparent 72%);
  pointer-events: none;
  z-index: 0;
  animation: introGlowPulse 4s ease-in-out infinite alternate;
}

.intro-grid-pattern {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  z-index: 0;
}

/* Center Content Box */
.intro-content {
  position: relative;
  z-index: 2;
  width: 90%;
  max-width: 480px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  transition: opacity 0.5s cubic-bezier(0.4, 0, 0.2, 1), transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1), filter 0.5s ease;
  will-change: opacity, transform, filter;
}

/* Holographic Neural Core HUD */
.intro-hud-core {
  position: relative;
  width: 170px;
  height: 170px;
  margin-bottom: 1.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hud-ring {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}

.hud-ring-outer {
  width: 170px;
  height: 170px;
  border: 1.5px dashed rgba(56, 189, 248, 0.45);
  box-shadow: 0 0 25px rgba(56, 189, 248, 0.15);
  animation: hudRotateCw 22s linear infinite;
}

.hud-ring-mid {
  width: 130px;
  height: 130px;
  border: 1.5px dotted rgba(129, 140, 248, 0.5);
  animation: hudRotateCcw 14s linear infinite;
}

.hud-ring-inner {
  width: 96px;
  height: 96px;
  border: 2px solid transparent;
  border-top-color: var(--cyan-bright, #67e8f9);
  border-bottom-color: var(--violet, #818cf8);
  animation: hudRotateCw 4s linear infinite;
}

.hud-crosshairs {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hud-crosshairs::before,
.hud-crosshairs::after {
  content: "";
  position: absolute;
  background: rgba(56, 189, 248, 0.25);
}

.hud-crosshairs::before {
  left: 50%;
  top: -8px;
  bottom: -8px;
  width: 1px;
  transform: translateX(-50%);
}

.hud-crosshairs::after {
  top: 50%;
  left: -8px;
  right: -8px;
  height: 1px;
  transform: translateY(-50%);
}

.intro-logo-badge {
  position: relative;
  z-index: 2;
  width: 66px;
  height: 66px;
  border-radius: 20px;
  background: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 35px rgba(56, 189, 248, 0.7), 0 0 70px rgba(129, 140, 248, 0.4);
  animation: corePulse 2.4s ease-in-out infinite;
}

.intro-logo-text {
  font-family: var(--font-display, 'Space Grotesk', sans-serif);
  font-size: 1.55rem;
  font-weight: 800;
  color: #040711;
  letter-spacing: -0.02em;
}

.intro-core-glow {
  position: absolute;
  inset: -12px;
  border-radius: 28px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.5), transparent 70%);
  filter: blur(10px);
  z-index: -1;
  animation: glowBreathe 2s ease-in-out infinite alternate;
}

/* Intro Typography */
.intro-meta {
  margin-bottom: 1.25rem;
}

.intro-author {
  font-family: var(--font-display, 'Space Grotesk', sans-serif);
  font-size: clamp(1.4rem, 4vw, 1.85rem);
  font-weight: 800;
  letter-spacing: 0.16em;
  color: #ffffff;
  margin-bottom: 0.35rem;
  text-shadow: 0 2px 24px rgba(103, 232, 249, 0.35);
}

.intro-role {
  font-family: var(--font-mono, monospace);
  font-size: clamp(0.72rem, 2vw, 0.8rem);
  letter-spacing: 0.18em;
  color: var(--cyan-bright, #67e8f9);
  text-transform: uppercase;
}

/* Telemetry Log Box */
.intro-terminal-box {
  width: 100%;
  background: rgba(8, 13, 30, 0.85);
  border: 1px solid rgba(56, 189, 248, 0.22);
  border-radius: 12px;
  padding: 0.75rem 1.1rem;
  margin-bottom: 1.4rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.55);
  text-align: left;
}

.intro-terminal-header {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 0.5rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.intro-terminal-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.dot-red {
  background: #f43f5e;
  box-shadow: 0 0 6px rgba(244, 63, 94, 0.6);
}

.dot-yellow {
  background: #fbbf24;
  box-shadow: 0 0 6px rgba(251, 191, 36, 0.6);
}

.dot-green {
  background: #34d399;
  box-shadow: 0 0 6px rgba(52, 211, 153, 0.6);
}

.intro-terminal-title {
  font-family: var(--font-mono, monospace);
  font-size: 0.68rem;
  color: var(--text-dim, #60728f);
  letter-spacing: 0.08em;
  margin-left: auto;
}

.intro-log-text {
  font-family: var(--font-mono, monospace);
  font-size: 0.78rem;
  color: #67e8f9;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 1.4rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.log-prompt {
  color: var(--violet, #818cf8);
  font-weight: 700;
}

.log-cursor {
  display: inline-block;
  width: 7px;
  height: 13px;
  background: var(--cyan-bright, #67e8f9);
  animation: blinkCursor 0.7s infinite;
  margin-left: 2px;
}

/* Progress Track & Numeric Counter */
.intro-progress-wrapper {
  width: 100%;
}

.intro-progress-bar {
  height: 5px;
  width: 100%;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  overflow: hidden;
  position: relative;
  margin-bottom: 0.6rem;
}

.intro-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #38bdf8, #818cf8, #c084fc);
  border-radius: 999px;
  box-shadow: 0 0 14px rgba(56, 189, 248, 0.9);
  transition: width 0.06s linear;
}

.intro-progress-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono, monospace);
  font-size: 0.74rem;
  color: var(--text-dim, #60728f);
  letter-spacing: 0.06em;
}

.intro-counter {
  color: var(--cyan-bright, #67e8f9);
  font-weight: 700;
  font-size: 0.95rem;
}

/* Skip Button */
.intro-skip-btn {
  position: absolute;
  top: 1.75rem;
  right: 2rem;
  z-index: 10;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.45rem 0.95rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--text-muted, #9db0cc);
  font-family: var(--font-mono, monospace);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.2, 0.8, 0.2, 1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.intro-skip-btn:hover {
  background: rgba(56, 189, 248, 0.15);
  border-color: rgba(56, 189, 248, 0.4);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(56, 189, 248, 0.25);
}

.intro-skip-btn kbd {
  display: inline-block;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  font-size: 0.68rem;
  color: #fff;
}

/* =============================================================
   3. HERO ENTRANCE CASCADE ANIMATIONS
   ============================================================= */

/* Shimmer on name accent */
.hero-title span.name-accent {
  background: linear-gradient(110deg, #67e8f9 0%, #818cf8 25%, #c084fc 50%, #67e8f9 75%, #818cf8 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: shimmerTitle 6s linear infinite;
}

.navbar.hero-animate-in {
  animation: heroNavEntrance 0.75s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}

.hero.hero-animate-in .status-pill {
  animation: heroStatusEntrance 0.75s cubic-bezier(0.34, 1.56, 0.64, 1) 0.12s both;
}

.hero.hero-animate-in .hero-title {
  animation: heroTitle3DEntrance 0.85s cubic-bezier(0.2, 0.8, 0.2, 1) 0.22s both;
}

.hero.hero-animate-in .hero-headline {
  animation: heroFadeSlideUp 0.75s cubic-bezier(0.2, 0.8, 0.2, 1) 0.34s both;
}

.hero.hero-animate-in .hero-bio {
  animation: heroFadeSlideUp 0.75s cubic-bezier(0.2, 0.8, 0.2, 1) 0.46s both;
}

.hero.hero-animate-in .hero-actions {
  animation: heroFadeSlideUp 0.75s cubic-bezier(0.2, 0.8, 0.2, 1) 0.58s both;
}

.hero.hero-animate-in .hero-stats-strip {
  animation: heroFadeSlideUp 0.75s cubic-bezier(0.2, 0.8, 0.2, 1) 0.7s both;
}

.hero.hero-animate-in .hero-visual-card {
  animation: heroVisualCardEntrance 0.9s cubic-bezier(0.2, 0.8, 0.2, 1) 0.3s both;
}

/* =============================================================
   4. SCROLL REVEAL & HOVER GLOW UTILITIES
   ============================================================= */

.reveal-init {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.2, 0.8, 0.2, 1),
              transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
  will-change: opacity, transform;
}

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

.hover-glow-card {
  position: relative;
}

.hover-glow-card::after {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.4), rgba(129, 140, 248, 0.2), transparent 70%);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  z-index: -1;
}

.hover-glow-card:hover::after {
  opacity: 1;
}

/* =============================================================
   5. ACCESSIBILITY / REDUCED MOTION CHECK
   ============================================================= */

@media (prefers-reduced-motion: reduce) {
  *, ::before, ::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .intro-curtain {
    display: none !important;
  }
  body.intro-active {
    overflow: auto !important;
    height: auto !important;
  }
}