/* ==========================================================================
   Chapter 05 - GSAP, Lottie and Rive. Scoped to #anim so nothing leaks into
   the other chapters (this file loads on every page).
   ========================================================================== */

/* ScrollTrigger jumps to the top to measure the page; CSS smooth scrolling turns that
   jump into a slow scroll and every trigger ends up measured in the wrong place. */
html:has(body[data-page="anim"]) { scroll-behavior: auto; }

.demo .tags li.anim { border-color: color-mix(in oklab, var(--k-anim) 60%, transparent); color: var(--k-anim); }
.demo .tags li.sound { border-color: color-mix(in oklab, var(--sun) 60%, transparent); color: var(--sun); }

#anim .an-jump a:hover { border-color: var(--k-anim); background: color-mix(in oklab, var(--k-anim) 12%, transparent); }
#anim .dz-group .mono { color: var(--k-anim); }
#anim .an-intro { max-width: 1400px; margin: -6px auto 22px; color: var(--mute); font-size: 16px; }
#anim .an-status { max-width: 1400px; margin: 18px auto 0; color: var(--mute); font-size: 11px; min-height: 16px; }
#anim .an-status.err { color: #ff8a8a; }
#anim .an-stage { padding: clamp(16px, 3vw, 26px); }
#anim .an-stage .btn { color: var(--ink); background: color-mix(in oklab, var(--card-2) 80%, transparent); border-color: var(--line-2); }
#anim .an-stage .btn:hover { border-color: var(--k-anim); background: color-mix(in oklab, var(--k-anim) 22%, var(--card-2)); }
#anim .an-stage .btn.on, #anim .an-stage .btn[aria-pressed="true"] { background: var(--k-anim); border-color: var(--k-anim); color: #0d1330; }
#anim .an-stage .btn:focus-visible, #anim button:focus-visible, #anim [tabindex]:focus-visible { outline: 2px solid var(--k-anim); outline-offset: 3px; }

/* ---------- Timeline ---------- */
#g-timeline .stage { padding: 0; display: grid; grid-template-rows: 1fr auto; }
.tl-scene { position: relative; overflow: hidden; margin: 18px 18px 0; border-radius: 16px; background: #0f1530; color: #fff; min-height: 300px; }
.tl-bg { position: absolute; inset: 0; background: linear-gradient(135deg, #1b2a6b, #6c8cff 60%, #ff7eb6); transform-origin: left; }
.tl-sun { position: absolute; right: 9%; top: 18%; width: 120px; height: 120px; border-radius: 50%; background: radial-gradient(circle at 35% 35%, #fff6c8, #f5c94a 45%, #ff6a1a); box-shadow: 0 0 60px rgba(255, 190, 80, .6); }
.tl-nav { position: absolute; left: 28px; right: 28px; top: 20px; display: flex; gap: 14px; align-items: center; }
.tl-nav i { width: 22px; height: 22px; border-radius: 6px; background: #fff; margin-right: auto; }
.tl-nav span { width: 46px; height: 6px; border-radius: 3px; background: rgba(255, 255, 255, .55); }
.tl-title { position: absolute; left: 28px; top: 70px; margin: 0; font-family: var(--serif); font-weight: 400; font-size: clamp(40px, 6vw, 72px); line-height: 1; }
.tl-title span, .tl-title em { display: inline-block; }
.tl-title em { color: #fff3c4; }
.tl-sub { position: absolute; left: 30px; top: calc(70px + clamp(40px, 6vw, 72px) + 14px); margin: 0; font-size: 16px; color: rgba(255, 255, 255, .85); }
.tl-cards { position: absolute; left: 28px; bottom: 24px; display: flex; gap: 12px; }
.tl-cards div { width: 110px; padding: 12px; border-radius: 12px; background: rgba(255, 255, 255, .16); border: 1px solid rgba(255, 255, 255, .3); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); font-size: 14px; font-weight: 600; display: grid; gap: 4px; }
.tl-cards b { font: 600 11px var(--mono); opacity: .75; }
.tl-cta { position: absolute; right: 28px; bottom: 28px; padding: 12px 22px; border-radius: 99px; background: #fff; color: #1b2a6b; font-weight: 700; font-size: 15px; }
.tl-ui { padding: 14px 18px 16px; display: grid; gap: 10px; }
.tl-buttons { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.tl-sep { width: 1px; height: 20px; background: var(--line-2); margin: 0 4px; }
.tl-scrub { display: flex; align-items: center; gap: 12px; }
.tl-scrub input { flex: 1; accent-color: var(--k-anim); }
.tl-scrub output { min-width: 54px; color: var(--mute); }
@media (max-width: 640px) { .tl-cards div { width: 80px; } .tl-cta { display: none; } .tl-sun { width: 70px; height: 70px; } }

/* ---------- Ease visualiser ---------- */
.ease-wrap { display: grid; grid-template-columns: minmax(150px, 220px) 1fr; gap: 20px; align-items: center; }
.ease-graph { width: 100%; overflow: visible; }
.ease-box { fill: none; stroke: var(--line-2); stroke-dasharray: 3 4; }
.ease-curve { fill: none; stroke: var(--k-anim); stroke-width: 3; stroke-linecap: round; }
.ease-dot { fill: #fff; stroke: var(--k-anim); stroke-width: 3; }
.ease-side { display: grid; gap: 14px; }
.ease-track { position: relative; height: 44px; border-radius: 12px; background: var(--card); border: 1px solid var(--line); }
.ease-ball, .ease-sq { position: absolute; left: 8px; top: 8px; width: 28px; height: 28px; border-radius: 50%; background: var(--k-anim); }
.ease-sq { border-radius: 6px; background: var(--pink); }
.ease-code { font-size: 12px; color: var(--mute); text-transform: none; }
.ease-list { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }
.ease-list .btn { font-family: var(--mono); font-size: 11px; }

/* ---------- Grid stagger ---------- */
.stg-grid { display: grid; grid-template-columns: repeat(16, 1fr); gap: clamp(4px, 1vw, 10px); padding: 6px; cursor: pointer; }
.stg-grid i { aspect-ratio: 1; border-radius: 50%; background: var(--line-2); display: block; }
.stg-opts { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }

/* ---------- SplitText ---------- */
.split-head { margin: 0 0 18px; font-family: var(--serif); font-weight: 400; font-size: clamp(30px, 3.6vw, 46px); line-height: 1.08; letter-spacing: -0.01em; min-height: 3.3em; perspective: 600px; }
.split-head em { color: var(--k-anim); }
.split-opts { display: flex; flex-wrap: wrap; gap: 6px; }

/* ---------- Scramble ---------- */
.scr-stage { display: grid; gap: 8px; align-content: start; }
.scr-kicker { color: var(--k-anim); font-size: 10.5px; }
.scr-head { margin: 0; font-size: clamp(28px, 3.4vw, 42px); font-weight: 800; letter-spacing: -0.03em; line-height: 1.05; min-height: 2.1em; }
.scr-type { margin: 0; color: var(--mint); font-size: 13px; text-transform: none; min-height: 20px; }
.scr-type i { font-style: normal; animation: dz-blink 1s steps(1) infinite; }
@keyframes dz-blink { 50% { opacity: 0; } }
.scr-board { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 12px; }
.scr-board span { width: 30px; height: 40px; display: grid; place-items: center; border-radius: 5px; background: #0b0b0d; color: #f5c94a; font: 700 20px var(--mono); box-shadow: inset 0 -20px 0 rgba(255, 255, 255, .04); border: 1px solid #2a2a30; }

/* ---------- Flip ---------- */
.flip-opts { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.flip-box { display: grid; gap: 10px; min-height: 250px; position: relative; }
.flip-tile { position: relative; padding: 0; border: 0; border-radius: 12px; overflow: hidden; cursor: pointer; background: var(--card-2); color: #fff; display: block; text-align: left; }
.flip-tile img { width: 100%; height: 100%; object-fit: cover; display: block; }
.flip-tile span { position: absolute; left: 8px; bottom: 8px; font: 600 11px var(--mono); text-transform: uppercase; padding: 2px 8px; border-radius: 99px; background: rgba(0, 0, 0, .5); }
.flip-box[data-layout="grid"] { grid-template-columns: repeat(3, 1fr); grid-auto-rows: 120px; }
.flip-box[data-layout="grid"] .flip-tile.featured { grid-column: span 2; grid-row: span 2; }
.flip-box[data-layout="list"] { grid-template-columns: 1fr; grid-auto-rows: 44px; gap: 6px; }
.flip-box[data-layout="list"] .flip-tile img { width: 64px; position: absolute; right: 0; top: 0; }
.flip-box[data-layout="list"] .flip-tile span { top: 50%; bottom: auto; translate: 0 -50%; background: none; font-size: 13px; }
.flip-box[data-layout="list"] .flip-tile.featured { outline: 2px solid var(--k-anim); }
.flip-box[data-layout="stack"] { grid-template-columns: 1fr; grid-template-rows: 250px; place-items: center; }
.flip-box[data-layout="stack"] .flip-tile { grid-area: 1 / 1; width: 200px; height: 220px; box-shadow: 0 12px 28px rgba(0, 0, 0, .4); }

/* ---------- Morph ---------- */
.morph-svg { width: min(240px, 70%); margin: 0 auto; display: block; overflow: visible; }
.morph-fill { fill: url(#morph-g); opacity: .9; }
.morph-line { fill: none; stroke: var(--ink); stroke-width: 2; stroke-linejoin: round; }
.morph-opts { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px; margin-top: 16px; }

/* ---------- Motion path ---------- */
.path-stage { display: grid; gap: 12px; justify-items: center; }
.path-svg { width: 100%; max-width: 520px; overflow: visible; }
.path-guide { fill: none; stroke: var(--line-2); stroke-width: 1.5; stroke-dasharray: 4 6; }
.path-trail { fill: none; stroke: var(--k-anim); stroke-width: 3; stroke-linecap: round; }
.path-pin { fill: var(--bg-2); stroke: var(--k-anim); stroke-width: 2; }
.path-plane path { fill: #fff; stroke: #1b2a6b; stroke-width: 1.2; stroke-linejoin: round; }
.path-plane .fold { fill: none; }
.path-ink { fill: none; stroke: var(--pink); stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.path-tools { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; }
.path-hint { margin: 0; min-height: 15px; font-size: 10.5px; color: var(--k-anim); text-align: center; }
.path-stage.drawing .path-svg { cursor: crosshair; touch-action: none; outline: 2px dashed color-mix(in oklab, var(--k-anim) 60%, transparent); outline-offset: 6px; border-radius: 10px; }
.path-stage.drawing .path-guide, .path-stage.drawing .path-trail, .path-stage.drawing .path-plane { opacity: .25; }

/* ---------- Drag ---------- */
.dp { border: 1px solid var(--line); border-radius: 14px; background: var(--card); padding: 14px 16px 16px; }
.dp + .dp { margin-top: 12px; }
.dp-head { display: grid; grid-template-columns: auto 1fr; gap: 10px; align-items: start; margin-bottom: 12px; }
.dp-num { width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; background: var(--k-anim); color: #0d1330; font-weight: 700; font-size: 11px; }
.dp-head b { font-size: 15px; }
.dp-head p { margin: 2px 0 0; font-size: 13px; color: var(--mute); }
.knob-row { display: grid; grid-template-columns: auto 1fr; gap: 22px; align-items: center; }
.knob { position: relative; width: 200px; height: 200px; display: grid; place-items: center; }
.knob-nums span { position: absolute; left: 50%; top: 50%; width: 20px; height: 20px; margin: -10px 0 0 -10px; display: grid; place-items: center; font: 600 11px var(--mono); color: var(--mute); transform: rotate(calc(var(--n) * 30deg - 165deg)) translateY(-88px) rotate(calc(var(--n) * -30deg + 165deg)); transition: color .2s, transform .2s; }
.knob-nums span.on { color: var(--k-anim); }
.knob-hint { position: absolute; inset: 0; width: 100%; height: 100%; fill: none; stroke: var(--k-anim); stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; opacity: .8; pointer-events: none; transform: rotate(-115deg); }
.dial { width: 132px; height: 132px; border-radius: 50%; position: relative; cursor: grab; touch-action: none;
  background: radial-gradient(circle at 35% 30%, color-mix(in oklab, var(--ink) 14%, var(--card-2)), var(--card-2) 60%); border: 1px solid var(--line-2); box-shadow: 0 10px 24px rgba(0, 0, 0, .35), inset 0 1px 0 rgba(255, 255, 255, .08); }
.dial:active { cursor: grabbing; }
.dial i { position: absolute; left: 50%; top: 10px; width: 6px; height: 30px; margin-left: -3px; border-radius: 3px; background: var(--k-anim); box-shadow: 0 0 12px var(--k-anim); }
.dial::after { content: ''; position: absolute; inset: 34%; border-radius: 50%; background: var(--card); border: 1px solid var(--line-2); }
.knob-read { display: grid; gap: 4px; align-content: center; }
.knob-read > .mono { font-size: 10.5px; color: var(--mute); }
.dial-out { font-family: var(--serif); font-size: 64px; line-height: 1; color: var(--ink); }
.meter { height: 6px; border-radius: 3px; background: var(--card-2); overflow: hidden; margin-top: 8px; }
.meter i { display: block; height: 100%; background: linear-gradient(90deg, var(--k-anim), var(--pink)); transform-origin: left; transform: scaleX(0); }
.meter-label { font-size: 10px; color: var(--mute); }
.rail { position: relative; overflow: hidden; border-radius: 12px; padding: 10px 0; cursor: grab; touch-action: pan-y; background: var(--bg-2); }
.rail:active { cursor: grabbing; }
.rail-track { display: flex; gap: 12px; padding: 0 12px; width: max-content; }
.rail-card { width: 130px; height: 110px; flex: none; border-radius: 12px; background: color-mix(in oklab, var(--c) 30%, var(--card)); border: 1px solid color-mix(in oklab, var(--c) 60%, transparent); padding: 12px; display: flex; flex-direction: column; justify-content: space-between; font-weight: 600; user-select: none; }
.rail-card b { font: 600 11px var(--mono); color: var(--c); }
.rail-hint { position: absolute; right: 12px; top: 50%; translate: 0 -50%; padding: 6px 12px; border-radius: 99px; background: var(--k-anim); color: #0d1330; font-size: 11px; font-weight: 700; pointer-events: none; box-shadow: 0 6px 18px rgba(0, 0, 0, .35); }
.rail-foot { display: grid; grid-template-columns: auto 1fr auto; gap: 14px; align-items: center; margin-top: 10px; }
.rail-foot .meter { margin: 0; }
.rail-dots { display: flex; gap: 5px; }
.rail-dots i { width: 7px; height: 7px; border-radius: 50%; background: var(--line-2); transition: background .2s, width .2s; }
.rail-dots i.on { background: var(--k-anim); width: 18px; border-radius: 4px; }
.drag-keys { margin: 12px 0 0; color: var(--mute); font-size: 10px; }
@media (max-width: 520px) { .knob-row { grid-template-columns: 1fr; justify-items: center; } .knob-read { justify-items: center; text-align: center; width: 100%; } .rail-foot { grid-template-columns: auto 1fr; } .rail-foot .meter-label { grid-column: 1 / -1; } }

/* ---------- Cursor ---------- */
.cur-stage { cursor: none; display: grid; place-items: center; }
.cur-stage .hint { color: var(--mute); background: none; }
.cur-dot, .cur-ring { position: absolute; left: 0; top: 0; border-radius: 50%; pointer-events: none; z-index: 3; opacity: 0; }
.cur-dot { width: 8px; height: 8px; margin: -4px 0 0 -4px; background: var(--ink); }
.cur-ring { width: 44px; height: 44px; margin: -22px 0 0 -22px; border: 1.5px solid var(--k-anim); mix-blend-mode: difference; transition: width .25s, height .25s, margin .25s, background .25s; }
.cur-ring.big { width: 90px; height: 90px; margin: -45px 0 0 -45px; background: rgba(108, 140, 255, .25); }
.cur-stage:hover .cur-dot, .cur-stage:hover .cur-ring { opacity: 1; }
.cur-buttons { display: flex; flex-wrap: wrap; gap: 26px; justify-content: center; align-items: center; }
.mag { cursor: none; border: 1px solid var(--line-2); background: var(--card); color: var(--ink); border-radius: 99px; padding: 14px 24px; font-size: 15px; font-weight: 600; }
.mag.big { padding: 30px 34px; border-radius: 50%; background: var(--k-anim); color: #0d1330; border: 0; }
@media (hover: none) { .cur-stage, .mag { cursor: auto; } }

/* ---------- ScrollTrigger scene ---------- */
#g-scroll .stage { padding: 0; }
.st-track { background: radial-gradient(circle at 50% 30%, #1b2348, var(--bg-2) 70%); }
.st-sticky { position: sticky; top: 0; height: 100vh; overflow: hidden; display: grid; grid-template-columns: 1fr 1fr; align-items: center; padding: 0 clamp(20px, 6vw, 90px); }
.st-copy { position: relative; height: 200px; }
.st-cap { position: absolute; inset: 0 auto auto 0; margin: 0; font-family: var(--serif); font-size: clamp(36px, 5vw, 72px); line-height: 1; opacity: 0; }
.st-cap em { color: var(--k-anim); }
.st-phone { justify-self: center; width: min(260px, 38vw); aspect-ratio: 9 / 19; border-radius: 40px; padding: 10px; background: #0b0b0e; box-shadow: 0 0 0 2px #333, 0 40px 80px rgba(0, 0, 0, .6); position: relative; z-index: 1; }
.st-screen { position: relative; width: 100%; height: 100%; border-radius: 31px; overflow: hidden; background: #111; }
.st-shot { position: absolute; inset: 0; background: center / cover; }
.st-orbs i { position: absolute; border-radius: 50%; filter: blur(40px); opacity: .55; }
.st-orbs i:nth-child(1) { width: 300px; height: 300px; background: #6c8cff; left: 50%; top: 20%; }
.st-orbs i:nth-child(2) { width: 240px; height: 240px; background: #ff7eb6; left: 70%; top: 55%; }
.st-orbs i:nth-child(3) { width: 200px; height: 200px; background: #2ec4b6; left: 40%; top: 65%; }
.st-bar { position: absolute; left: 24px; right: 24px; bottom: 24px; height: 3px; background: var(--line); border-radius: 2px; }
.st-bar i { display: block; height: 100%; width: 100%; background: var(--k-anim); transform-origin: left; transform: scaleX(0); }
@media (max-width: 720px) { .st-sticky { grid-template-columns: 1fr; grid-template-rows: auto 1fr; padding-top: 100px; } .st-copy { height: 120px; } .st-phone { width: min(200px, 52vw); } }

/* ---------- Lottie ---------- */
.lp-row { display: grid; grid-template-columns: minmax(150px, 220px) 1fr; gap: 22px; align-items: center; }
.lp-anim { aspect-ratio: 1; border-radius: 18px; background: var(--card); border: 1px solid var(--line); }
.lp-ctrl { display: grid; gap: 12px; }
.lp-btns { display: flex; flex-wrap: wrap; gap: 6px; }
.lp-field { display: grid; grid-template-columns: 52px 1fr 42px; align-items: center; gap: 10px; }
.lp-field .mono { font-size: 10px; color: var(--mute); }
.lp-field input { accent-color: var(--k-anim); width: 100%; }
.lp-field output { color: var(--ink); font-size: 11px; text-align: right; }
.lp-json-btn { justify-self: start; }
.lp-json { margin: 16px 0 0; max-height: 220px; overflow: auto; padding: 12px; border-radius: 10px; background: #0b0b0d; color: #b7aea4; font-size: 11px; line-height: 1.5; text-transform: none; white-space: pre; }
@media (max-width: 560px) { .lp-row { grid-template-columns: 1fr; } .lp-anim { width: 200px; justify-self: center; } }
.li-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.li-btn { aspect-ratio: 1; border-radius: 18px; background: var(--card); border: 1px solid var(--line); cursor: pointer; display: grid; grid-template-rows: 1fr auto; justify-items: center; padding: 10px 10px 12px; color: var(--mute); transition: border-color .2s, background .2s; }
.li-btn:hover { border-color: var(--k-anim); }
.li-btn[aria-pressed="true"] { background: color-mix(in oklab, var(--k-anim) 12%, var(--card)); color: var(--ink); }
.li-anim { width: 72%; aspect-ratio: 1; display: block; }
.li-btn .mono { font-size: 10px; }
@media (max-width: 480px) { .li-grid { grid-template-columns: repeat(2, 1fr); } }
#l-scroll .ls-stage { padding: 0; display: grid; place-items: center; background: linear-gradient(#0d1330, #1b2a6b 60%, #2d1f4a); }
.ls-anim { position: absolute; inset: 0; }
.ls-read { position: absolute; right: 16px; bottom: 14px; color: rgba(255, 255, 255, .7); font-size: 10.5px; }

/* ---------- Rive ---------- */
.rv-stage { padding: 0; }
.rv-stage canvas.rv { width: 100%; height: 100%; display: block; touch-action: none; }
.rv-stage .controls { justify-content: center; }
/* Fixed box and minmax(0, 1fr) tracks: the canvases' own pixel size must never feed back into the layout. */
.rv-trio { position: absolute; inset: 18px 10px 60px; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); grid-template-rows: minmax(0, 1fr); gap: 6px; }
.rv-trio canvas.rv { height: 100%; min-width: 0; min-height: 0; }
#r-centaur .cen-stage { background: linear-gradient(#bfe3ff, #f5e6c8); }
.cen-stage canvas.rv:focus-visible { outline-offset: -4px; }
#r-truck .rv-stage { background: #d9485b; }
#r-rating .rv-stage, #r-switch .rv-stage { background: #111; }
.rv-note { position: absolute; inset: 0; display: grid; place-items: center; color: var(--mute); font-size: 12px; padding: 20px; text-align: center; }