/* =============================================================
   BraceCoder — 3D & scroll effects (paired with assets/js/fx3d.js)
   Everything here is progressive: without JS, or with
   prefers-reduced-motion, the site looks exactly as before.
   ============================================================= */

/* -------------------------------------------------------------
   1. Buttons with depth
   ------------------------------------------------------------- */
.btn-primary { box-shadow: 0 3px 0 #4338ca; }
.btn-primary:hover { box-shadow: 0 4px 0 #3730a3, 0 10px 20px rgba(99,102,241,.3); }
.btn-primary:active { transform: translateY(3px); box-shadow: 0 0 0 #3730a3; }
.btn-ghost { box-shadow: 0 2px 0 var(--border); }
.btn-ghost:hover { transform: translateY(-1px); box-shadow: 0 3px 0 var(--primary); }
.btn-ghost:active { transform: translateY(2px); box-shadow: none; }

/* -------------------------------------------------------------
   2. Logo: the braces spin in 3D on hover
   ------------------------------------------------------------- */
.logo { perspective: 400px; }
.logo .logo-brace { display: inline-block; transition: transform .7s cubic-bezier(.3,1.4,.5,1); }
.logo:hover .logo-brace { transform: rotateY(360deg); }
.logo:hover .logo-brace:last-child { transform: rotateY(-360deg); }

/* -------------------------------------------------------------
   3. Cursor-following card tilt (.fx-tilt is added by fx3d.js)
   ------------------------------------------------------------- */
.fx-tilt,
.fx-tilt:hover {
  position: relative;
  transform: perspective(900px) rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg)) translateY(var(--lift, 0px));
  transition: transform .5s cubic-bezier(.2,.8,.2,1), box-shadow .3s, border-color .3s;
}
.fx-tilt:hover { --lift: -4px; box-shadow: 0 22px 40px -18px rgba(99,102,241,.45); }
.fx-tilt.fx-tilt-active { transition-duration: .1s, .3s, .3s; }
.fx-tilt::after {
  content: "";
  position: absolute; inset: 0;
  border-radius: inherit;
  pointer-events: none;
  opacity: 0;
  transition: opacity .3s;
  background: radial-gradient(circle at var(--gx, 50%) var(--gy, 50%), rgba(255,255,255,.45), transparent 55%);
  mix-blend-mode: soft-light;
}
.fx-tilt.fx-tilt-active::after { opacity: 1; }

/* -------------------------------------------------------------
   4. Home hero: two columns, perspective floor, code cube
   ------------------------------------------------------------- */
.hero.fx-hero { padding-bottom: 4rem; }
.fx-hero .hero-inner { display: grid; gap: 1rem; align-items: center; }
.fx-hero .hero-content {
  transform: perspective(900px) translateY(calc(var(--hp, 0) * -70px)) rotateX(calc(var(--hp, 0) * 28deg));
  transform-origin: 50% 0;
  opacity: calc(1 - var(--hp, 0) * 1.3);
}
@media (min-width: 1025px) {
  .fx-hero .hero-inner { grid-template-columns: 1.1fr .9fr; gap: 2.5rem; }
  .fx-hero .hero-content { text-align: left; }
  .fx-hero .hero-subtitle { margin-left: 0; }
  .fx-hero .hero-actions, .fx-hero .hero-stats { justify-content: flex-start; }
}

.fx-floor {
  position: absolute;
  left: -50%; right: -50%; bottom: 0;
  height: 65%;
  transform: perspective(420px) rotateX(62deg);
  transform-origin: 50% 100%;
  background-image:
    linear-gradient(to right, rgba(99,102,241,.18) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(99,102,241,.18) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: linear-gradient(to top, #000 20%, transparent 90%);
  mask-image: linear-gradient(to top, #000 20%, transparent 90%);
  animation: fx-floor-move 3s linear infinite;
  pointer-events: none;
}
@keyframes fx-floor-move { to { background-position: 0 48px; } }

.fx-scene-wrap {
  position: relative; z-index: 1;
  transform: perspective(900px) translateZ(calc(var(--hp, 0) * 260px)) rotateY(calc(var(--hp, 0) * -50deg));
  opacity: calc(1 - var(--hp, 0) * 1.1);
}
.fx-scene {
  display: grid; place-items: center;
  height: 24rem;
  perspective: 1100px;
}
.fx-stage {
  position: relative;
  width: 150px; height: 150px;
  transform-style: preserve-3d;
  transform: rotateX(calc(-8deg + var(--py, 0deg))) rotateY(var(--px, 0deg));
  transition: transform .8s cubic-bezier(.2,.8,.2,1);
}
.fx-float {
  position: absolute; inset: 0;
  transform-style: preserve-3d;
  animation: fx-float 6s ease-in-out infinite;
}
@keyframes fx-float {
  0%, 100% { transform: translateY(-10px); }
  50% { transform: translateY(12px); }
}
.fx-cube {
  position: absolute; inset: 0;
  transform-style: preserve-3d;
  animation: fx-tumble 20s linear infinite;
}
@keyframes fx-tumble {
  from { transform: rotate3d(1, 1, .3, 0deg); }
  to   { transform: rotate3d(1, 1, .3, 360deg); }
}
.fx-face {
  position: absolute; inset: 0;
  display: grid; place-items: center;
  border: 1px solid rgba(255,255,255,.3);
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(99,102,241,.9), rgba(124,58,237,.9));
  box-shadow: inset 0 0 36px rgba(255,255,255,.18), 0 0 30px rgba(99,102,241,.25);
  font-family: var(--font-mono);
  font-size: 2.6rem; font-weight: 700; line-height: 1;
  color: #fff;
  text-shadow: 0 2px 12px rgba(0,0,0,.25);
}
.fx-face:nth-child(1) { transform: translateZ(75px); }
.fx-face:nth-child(2) { transform: rotateY(90deg) translateZ(75px); }
.fx-face:nth-child(3) { transform: rotateY(180deg) translateZ(75px); }
.fx-face:nth-child(4) { transform: rotateY(-90deg) translateZ(75px); }
.fx-face:nth-child(5) { transform: rotateX(90deg) translateZ(75px); background: linear-gradient(135deg, rgba(129,140,248,.92), rgba(79,70,229,.92)); }
.fx-face:nth-child(6) { transform: rotateX(-90deg) translateZ(75px); background: linear-gradient(135deg, rgba(139,92,246,.92), rgba(55,48,163,.92)); }
.fx-orbit {
  position: absolute; inset: 0;
  transform-style: preserve-3d;
  animation: fx-orbit 26s linear infinite;
}
@keyframes fx-orbit {
  from { transform: rotateZ(-10deg) rotateY(0deg); }
  to   { transform: rotateZ(-10deg) rotateY(-360deg); }
}
.fx-tile {
  position: absolute; left: 50%; top: 50%;
  padding: .3rem .65rem;
  border: 1px solid rgba(99,102,241,.3);
  border-radius: 8px;
  background: rgba(255,255,255,.88);
  box-shadow: 0 6px 18px rgba(99,102,241,.2);
  font-family: var(--font-mono);
  font-size: .8rem; font-weight: 600; line-height: 1.4;
  color: var(--primary-dark);
  white-space: nowrap;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transform: translate(-50%, -50%) rotateY(var(--a)) translateZ(215px);
}
.fx-shadow {
  position: absolute; left: 50%; top: 50%;
  width: 240px; height: 240px;
  margin: -120px 0 0 -120px;
  transform: translateY(165px) rotateX(90deg);
  background: radial-gradient(closest-side, rgba(99,102,241,.38), transparent);
  animation: fx-shadow 6s ease-in-out infinite;
}
@keyframes fx-shadow { 0%, 100% { opacity: .55; } 50% { opacity: 1; } }
@media (max-width: 640px) {
  .fx-scene { height: 18rem; scale: .7; }
}

/* -------------------------------------------------------------
   5. Scroll reveal. Only active once fx3d.js sets html.fx.
      Uses the individual translate/rotate properties so it
      composes with the card tilt transform.
   ------------------------------------------------------------- */
html.fx [data-reveal]:not([data-reveal="stagger"]) {
  opacity: 0;
  translate: 0 40px;
  rotate: x 14deg;
  transform-origin: 50% 100%;
  transition: opacity .8s ease, translate .8s cubic-bezier(.2,.8,.2,1), rotate .8s cubic-bezier(.2,.8,.2,1);
}
html.fx [data-reveal="stagger"] { perspective: 1400px; }
html.fx [data-reveal="stagger"] > * {
  opacity: 0;
  translate: 0 70px -140px;
  rotate: x -30deg;
  transform-origin: 50% 0;
  transition:
    opacity .7s ease calc(min(var(--i, 0), 5) * 110ms),
    translate .9s cubic-bezier(.2,.8,.2,1) calc(min(var(--i, 0), 5) * 110ms),
    rotate .9s cubic-bezier(.2,.8,.2,1) calc(min(var(--i, 0), 5) * 110ms),
    transform .5s cubic-bezier(.2,.8,.2,1),
    box-shadow .3s, border-color .3s;
}
html.fx [data-reveal="stagger"] > .fx-tilt-active { transition-duration: .7s, .9s, .9s, .1s, .3s, .3s; }
html.fx [data-reveal][data-shown]:not([data-reveal="stagger"]),
html.fx [data-reveal="stagger"][data-shown] > * {
  opacity: 1;
  translate: 0 0 0;
  rotate: x 0deg;
}

/* -------------------------------------------------------------
   6. Reading progress bar under the navbar
   ------------------------------------------------------------- */
.fx-progress {
  position: absolute; left: 0; right: 0; bottom: -1px;
  height: 3px;
  background: linear-gradient(to right, #6366f1, #8b5cf6, #ec4899);
  transform: scaleX(var(--page-p, 0));
  transform-origin: 0 50%;
  pointer-events: none;
}

/* -------------------------------------------------------------
   7. Home: pinned prism that turns face by face as you scroll
   ------------------------------------------------------------- */
.fx-prism-scroll {
  position: relative;
  height: 300vh;
  background: linear-gradient(to bottom, transparent, rgba(99,102,241,.06) 20%, rgba(99,102,241,.06) 80%, transparent);
}
.fx-prism-sticky {
  position: sticky;
  top: var(--header-height);
  height: calc(100vh - var(--header-height));
  height: calc(100svh - var(--header-height));
  display: flex; flex-direction: column; justify-content: center;
  gap: 2.5rem;
  overflow: hidden;
  text-align: center;
}
.fx-prism-head .section-title { font-size: clamp(1.8rem, 4vw, 2.4rem); }
.fx-prism-head .hero-accent { color: var(--primary); }
.fx-prism-viewport { display: grid; place-items: center; perspective: 1400px; }
.fx-prism {
  --w: min(34rem, calc(100vw - 2.5rem));
  position: relative;
  width: var(--w); height: 19rem;
  transform-style: preserve-3d;
  transform: translateZ(calc(var(--w) * -.2887)) rotateY(var(--turn, 0deg));
}
.fx-prism-face {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; justify-content: center;
  padding: 2rem;
  text-align: left;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: 0 30px 60px -20px rgba(99,102,241,.4);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transform: rotateY(var(--a)) translateZ(calc(var(--w) * .2887));
  opacity: .45;
  pointer-events: none;
  transition: opacity .4s;
}
.fx-prism-face.is-active { opacity: 1; pointer-events: auto; }
.fx-prism-kicker {
  display: flex; align-items: center; gap: .75rem;
  font-family: var(--font-mono); font-size: .8rem; font-weight: 700;
  letter-spacing: .12em; text-transform: uppercase;
  color: var(--face-color, var(--primary));
}
.fx-prism-kicker i {
  display: grid; place-items: center;
  width: 48px; height: 48px;
  border-radius: 12px;
  font-size: 1.3rem;
  background: color-mix(in srgb, var(--face-color, var(--primary)) 14%, transparent);
}
.fx-prism-face h3 { margin-top: 1rem; font-size: 1.5rem; font-weight: 800; line-height: 1.3; color: var(--text); }
.fx-prism-face p { margin-top: .5rem; color: var(--text-light); }
.fx-prism-face .btn { align-self: flex-start; margin-top: 1.5rem; }
.fx-prism-dots { display: flex; justify-content: center; gap: .5rem; }
.fx-prism-dots span {
  width: .5rem; height: .5rem;
  border-radius: 999px;
  background: var(--border);
  transition: width .3s, background .3s;
}
.fx-prism-dots span.is-on { width: 1.75rem; background: var(--primary); }

/* -------------------------------------------------------------
   8. Dark mode
   ------------------------------------------------------------- */
html.dark .fx-floor {
  background-image:
    linear-gradient(to right, rgba(129,140,248,.2) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(129,140,248,.2) 1px, transparent 1px);
}
html.dark .fx-tile {
  border-color: rgba(129,140,248,.35);
  background: rgba(15,23,42,.88);
  color: #c7d2fe;
  box-shadow: 0 6px 22px rgba(99,102,241,.3);
}
html.dark .fx-shadow { background: radial-gradient(closest-side, rgba(129,140,248,.45), transparent); }
html.dark .fx-prism-face { box-shadow: 0 30px 60px -20px rgba(0,0,0,.6); }

/* -------------------------------------------------------------
   9. Reduced motion: keep the look, drop the movement
   ------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .fx-tilt, .fx-tilt:hover { transform: none; }
  .fx-tilt::after { display: none; }
  .fx-floor, .fx-float, .fx-cube, .fx-orbit, .fx-shadow { animation: none; }
  .logo .logo-brace { transition: none; }
  .fx-hero .hero-content, .fx-scene-wrap { transform: none; opacity: 1; }
  .fx-prism-scroll { height: auto; padding: 4rem 0; }
  .fx-prism-sticky { position: static; height: auto; overflow: visible; }
  .fx-prism { display: grid; width: auto; height: auto; gap: 1.5rem; padding: 0 1.25rem; transform: none; }
  .fx-prism-face { position: static; transform: none; opacity: 1; pointer-events: auto; }
  .fx-prism-dots { display: none; }
}
@media (prefers-reduced-motion: reduce) and (min-width: 1025px) {
  .fx-prism { grid-template-columns: repeat(3, minmax(0, 20rem)); justify-content: center; }
}