/* ══════════════════════════════════════════════════════════════
   motion.css  —  Atharva Bhosale Portfolio Motion Design System
   
   ONE language. ONE family. Every animation belongs here.
   
   Tokens → Keyframes → Utility classes → Component states
   ══════════════════════════════════════════════════════════════ */

/* ── Motion Tokens ──────────────────────────────────────────── */
:root {
  /* Duration Scale — Named by feel, not milliseconds */
  --dur-instant:  0.06s;   /* Micro: button press, click flash */
  --dur-fast:     0.18s;   /* Quick: hover state changes */
  --dur-normal:   0.42s;   /* Default: UI transitions */
  --dur-slow:     0.85s;   /* Reveals: sections, panels */
  --dur-epic:     1.6s;    /* Cinematic: page load, hero */

  /* Easing Scale — One family, four roles */
  --ease-out:     cubic-bezier(0.16, 1, 0.3, 1);      /* Primary: all enters */
  --ease-in:      cubic-bezier(0.7, 0, 0.84, 0);       /* Exits only */
  --ease-spring:  cubic-bezier(0.34, 1.56, 0.64, 1);   /* Elastic: lifts, bounces */
  --ease-smooth:  cubic-bezier(0.25, 0.46, 0.45, 0.94);/* Scroll parallax, glides */
  --ease-linear:  linear;                               /* Scrubs, continuous loops */

  /* Stagger — one value, used consistently */
  --stagger:      0.08s;
  --stagger-sm:   0.04s;
  --stagger-lg:   0.14s;

  /* Overwrite base.css transition shorthands with motion tokens */
  --transition-fast:   var(--dur-fast) var(--ease-out);
  --transition-normal: var(--dur-normal) var(--ease-out);
  --transition-slow:   var(--dur-slow) var(--ease-out);
}


/* ── Keyframe Library ────────────────────────────────────────── */

/* Reveal upward from clipped container */
@keyframes reveal-up {
  from { transform: translateY(102%); }
  to   { transform: translateY(0); }
}

/* Fade in with upward drift */
@keyframes fade-up {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Fade in only */
@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* Blur to sharp reveal */
@keyframes blur-reveal {
  from { opacity: 0; filter: blur(12px); transform: translateY(16px); }
  to   { opacity: 1; filter: blur(0);    transform: translateY(0); }
}

/* Scale reveal (for images, cards) */
@keyframes scale-reveal {
  from { opacity: 0; transform: scale(1.06); }
  to   { opacity: 1; transform: scale(1); }
}

/* Continuous ambient pulse */
@keyframes ambient-pulse {
  0%, 100% { opacity: 0.5; transform: translateX(-50%) scale(1); }
  50%       { opacity: 0.8; transform: translateX(-50%) scale(1.08); }
}

/* Loader bar sweep */
@keyframes loader-sweep {
  from { transform: scaleX(0); transform-origin: left; }
  to   { transform: scaleX(1); transform-origin: left; }
}

/* Subtle float (scroll indicator) */
@keyframes float-bob {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(6px); }
}

/* Shimmer for skeleton loaders */
@keyframes shimmer {
  from { background-position: -400px 0; }
  to   { background-position: 400px 0; }
}

/* Dot pulse (journey timeline nodes) */
@keyframes dot-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255,255,255,0.4); }
  50%       { box-shadow: 0 0 0 8px rgba(255,255,255,0); }
}

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

/* Link underline sweep */
@keyframes underline-sweep {
  from { transform: scaleX(0); transform-origin: left; }
  to   { transform: scaleX(1); transform-origin: left; }
}

/* Nav link stagger in */
@keyframes nav-link-in {
  from { opacity: 0; transform: translateX(-32px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* Success checkmark draw */
@keyframes check-draw {
  from { stroke-dashoffset: 30; }
  to   { stroke-dashoffset: 0; }
}


/* ── Utility: Reveal Wrappers ─────────────────────────────────
   Apply to the PARENT element to clip children during animation  */

.clip-wrap {
  overflow: hidden;
  display: block; /* Ensure block context for child transform */
}

/* Lines of text get this — clips the upward reveal */
.line-wrap {
  overflow: hidden;
  display: block;
  padding-bottom: 0.08em; /* Prevent descender clips */
}


/* ── Utility: GSAP Initial States ────────────────────────────
   Elements start invisible. GSAP sets them visible via scroll.
   Using CSS initial state prevents FOUC on slow connections.    */

[data-reveal] {
  opacity: 0;
  transform: translateY(32px);
  will-change: transform, opacity;
}

[data-reveal="blur"] {
  opacity: 0;
  filter: blur(10px);
  transform: translateY(18px);
  will-change: transform, opacity, filter;
}

[data-reveal="scale"] {
  opacity: 0;
  transform: scale(1.05);
  will-change: transform, opacity;
}

[data-reveal="left"] {
  opacity: 0;
  transform: translateX(-32px);
  will-change: transform, opacity;
}

/* Line reveals: child spans start offset, clip-wrap on parent */
[data-reveal="line"] {
  /* Parent wraps children */
}
[data-reveal="line"] .line-inner {
  display: block;
  transform: translateY(104%);
  will-change: transform;
}


/* ── Utility: Interactive Element Base States ─────────────────── */

/* Underline animation for links */
.animated-link {
  position: relative;
  display: inline-block;
}

.animated-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--dur-normal) var(--ease-out);
}

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


/* ── Button Motion Layer ─────────────────────────────────────── */

/* Magnetic button base — JS adds inline transform offset */
.btn-premium,
.btn-outline {
  position: relative;
  overflow: hidden;
  transition:
    transform var(--dur-normal) var(--ease-spring),
    box-shadow var(--dur-normal) var(--ease-out),
    background var(--dur-fast) var(--ease-out);
  will-change: transform;
}

/* Ripple pseudo-element — JS triggers via .ripple-active class */
.btn-premium::after,
.btn-outline::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: rgba(255, 255, 255, 0.15);
  transform: scale(0);
  opacity: 0;
  transition: transform var(--dur-normal) var(--ease-out), opacity var(--dur-normal) var(--ease-out);
  pointer-events: none;
}

.btn-premium.ripple-active::after,
.btn-outline.ripple-active::after {
  transform: scale(1);
  opacity: 0;
  transition: transform var(--dur-fast) var(--ease-out), opacity var(--dur-slow) var(--ease-out);
}

.btn-premium:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 40px rgba(255, 255, 255, 0.15);
}

.btn-premium:active {
  transform: scale(0.96) !important;
  transition: transform var(--dur-instant) var(--ease-in) !important;
}

.btn-outline:hover {
  border-color: rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.04);
  transform: translateY(-2px);
}

.btn-outline:active {
  transform: scale(0.97) !important;
  transition: transform var(--dur-instant) var(--ease-in) !important;
}


/* ── Card Motion Layer ───────────────────────────────────────── */

/* 3D tilt card — perspective set on parent */
.tilt-card {
  transform-style: preserve-3d;
  transition:
    transform var(--dur-normal) var(--ease-spring),
    box-shadow var(--dur-normal) var(--ease-out);
  will-change: transform;
}

.tilt-card:hover {
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.7);
}

/* Tilt-card image inner — scale on hover */
.tilt-card .tilt-img {
  overflow: hidden;
}

.tilt-card .tilt-img img {
  transition: transform var(--dur-slow) var(--ease-out);
  will-change: transform;
}

.tilt-card:hover .tilt-img img {
  transform: scale(1.06);
}

/* Work card lift */
.work-card {
  transition:
    transform var(--dur-normal) var(--ease-spring),
    box-shadow var(--dur-normal) var(--ease-out);
  will-change: transform;
}

.work-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.6);
}


/* ── Form Motion Layer ───────────────────────────────────────── */

.input-group {
  position: relative;
}

.input-group::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-text-primary);
  transition: width var(--dur-normal) var(--ease-out);
}

.input-group:focus-within::after {
  width: 100%;
}


/* ── Skeleton Loader ─────────────────────────────────────────── */

.skeleton {
  background: linear-gradient(
    90deg,
    rgba(255,255,255,0.04) 0%,
    rgba(255,255,255,0.10) 50%,
    rgba(255,255,255,0.04) 100%
  );
  background-size: 800px 100%;
  animation: shimmer 1.6s var(--ease-linear) infinite;
  border-radius: var(--radius-md);
}


/* ── Reduced Motion Overrides ────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  [data-reveal],
  [data-reveal="blur"],
  [data-reveal="scale"],
  [data-reveal="left"],
  [data-reveal="line"] .line-inner {
    opacity: 1 !important;
    transform: none !important;
    filter: none !important;
    transition: none !important;
    animation: none !important;
  }

  .btn-premium,
  .btn-outline,
  .tilt-card,
  .work-card {
    transition: none !important;
  }

  .animated-link::after {
    transition: none !important;
  }
}