/* ─────────────────────────────────────────────────────────────
   animations.css — site-wide motion layer
   Branden K. Soo portfolio
   All animations gated by prefers-reduced-motion via @media query.
   ───────────────────────────────────────────────────────────── */

/* === 1. REVEAL ON SCROLL ============================== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .7s cubic-bezier(.2,.7,.2,1),
              transform .7s cubic-bezier(.2,.7,.2,1);
  will-change: opacity, transform;
}
.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}
/* Optional staggered delays — apply with .reveal.delay-1, .delay-2, .delay-3 */
.reveal.delay-1 { transition-delay: .08s; }
.reveal.delay-2 { transition-delay: .16s; }
.reveal.delay-3 { transition-delay: .24s; }
.reveal.delay-4 { transition-delay: .32s; }

/* === 3. HERO TEXT ENTRANCE ============================ */
/* The hero name + tagline lift up on initial paint */
.hero-anim-name,
.hero-anim-sub {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .9s cubic-bezier(.2,.7,.2,1),
              transform .9s cubic-bezier(.2,.7,.2,1);
}
.hero-anim-name.hero-in { opacity: 1; transform: translateY(0); }
.hero-anim-sub.hero-in {
  opacity: 1;
  transform: translateY(0);
  transition-delay: .15s;
}

/* === 4. PROJECT CARD HOVER LIFT ======================= */
.proj-card {
  transition: transform .35s cubic-bezier(.2,.7,.2,1),
              box-shadow .35s cubic-bezier(.2,.7,.2,1),
              border-color .25s ease;
}
.proj-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 18px 38px -12px rgba(11,31,58,.18),
              0 4px 10px rgba(11,31,58,.06);
}

/* === 5. NAV LINK HOVER UNDERLINE ====================== */
/* Gold underline that grows from left to right under each nav pill on hover */
.nav-links a {
  position: relative;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 12%;
  right: 12%;
  bottom: 4px;
  height: 1.5px;
  background: var(--gold, #c9a84c);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .35s cubic-bezier(.2,.7,.2,1);
  pointer-events: none;
  border-radius: 1px;
}
.nav-links a:hover::after { transform: scaleX(1); }
/* When nav link is the active page-tab (filled gold pill), hide the underline */
.nav-links a.active::after { display: none; }

/* === 6. PULSING SCROLL CUE UNDER HERO ================= */
.hero-scroll-cue {
  position: absolute;
  left: 50%;
  bottom: 36px;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  opacity: 0;
  pointer-events: none;
  z-index: 5;
  animation: scrollCueFadeIn 1s cubic-bezier(.2,.7,.2,1) 1.4s forwards;
}
.hero-scroll-cue .cue-label {
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.45);
}
.hero-scroll-cue .cue-line {
  width: 1px;
  height: 38px;
  background: linear-gradient(to bottom,
    rgba(201,168,76,0.55),
    rgba(201,168,76,0.05));
  /* No pulse animation — solid line, no flicker */
}
@keyframes scrollCueFadeIn {
  to { opacity: 1; }
}
/* Hide cue once user has scrolled */
body.scrolled .hero-scroll-cue {
  opacity: 0;
  transition: opacity .4s ease;
}

/* === 3D-A. PROJECT CARD 3D TILT ======================= */
/* Adds a perspective container; JS handles the rotateX/rotateY */
.tilt-3d {
  transform-style: preserve-3d;
  transition: transform .15s cubic-bezier(.3,.7,.3,1);
  will-change: transform;
}
/* When tilting, also keep the hover-lift box-shadow */
.tilt-3d.is-tilting {
  transition: transform .05s linear;
}

/* === 3D-B. SPLIT-FLAP STAT COUNTERS =================== */
/* Each stat number gets multiple flap layers; JS creates the spans dynamically */
.split-flap {
  display: inline-block;
  perspective: 600px;
}
.split-flap .flap-char {
  display: inline-block;
  position: relative;
  transform-style: preserve-3d;
  transition: transform .42s cubic-bezier(.5,.05,.3,1);
  transform-origin: center center;
}
.split-flap .flap-char.flipping {
  animation: flapFlip .55s cubic-bezier(.6,0,.4,1);
}
@keyframes flapFlip {
  0%   { transform: rotateX(0deg);   filter: brightness(1); }
  40%  { transform: rotateX(-95deg); filter: brightness(.55); }
  41%  { transform: rotateX(85deg);  filter: brightness(.55); }
  100% { transform: rotateX(0deg);   filter: brightness(1); }
}

/* === 3D-D. SPINNING GLOBE / COMPASS =================== */
/* SVG rotates slowly in 2D — pivots around its center. */
.globe-spin {
  display: inline-block;
  animation: globeSpin 6s linear infinite;
  transform-origin: 50% 50%;
  will-change: transform;
  vertical-align: middle;
}
@keyframes globeSpin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* === 3D-E. GOLD ACCENT RULE DRAW ====================== */
/* The 36px gold underline beneath each section heading "draws" itself in */
.sec-rule,
.draw-rule {
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .9s cubic-bezier(.2,.7,.2,1);
  will-change: transform;
}
.sec-rule.in-view,
.draw-rule.in-view,
.sec-rule.wipe-visible {
  transform: scaleX(1);
}

/* === REDUCED-MOTION SAFE FALLBACKS ==================== */
@media (prefers-reduced-motion: reduce) {
  .reveal,
  .hero-anim-name,
  .hero-anim-sub,
  .sec-rule,
  .draw-rule,
  .proj-card,
  .nav-links a::after,
  .tilt-3d,
  .split-flap .flap-char,
  .globe-spin {
    transition: none !important;
    animation: none !important;
    transform: none !important;
    opacity: 1 !important;
  }
  .sec-rule, .draw-rule { transform: scaleX(1) !important; }
  .hero-scroll-cue, .hero-scroll-cue .cue-line { animation: none !important; opacity: .5; }
}