/* Nexus Digital — company profile deck (about/th.html, en.html, zh.html)
   1920×1080 stage scaled to the window; light white→blue slides with a dark cinematic
   cover/closing; every element animates in when its slide becomes active. */
:root {
    --navy: #0A1B33; --navy2: #102A4E; --navy3: #16386B;
    --blue: #2563EB; --sky: #4CC3FF; --gold: #D9B24A; --gold2: #F3DFA0;
    --ink: #1E293B; --muted: #5B6B80; --line: rgba(37,99,235,.16);
    --grad: linear-gradient(110deg, #2563EB 0%, #4CC3FF 100%);
    --ease: cubic-bezier(.16, 1, .3, 1);
    --spring: cubic-bezier(.34, 1.56, .64, 1);
    --font: 'Prompt', 'Leelawadee UI', 'Segoe UI', sans-serif;
}
html[lang="zh-CN"] { --font: 'Noto Sans SC', 'Prompt', 'Microsoft YaHei', sans-serif; }
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; background: #E6EFFB; font-family: var(--font); color: var(--ink);
    -webkit-font-smoothing: antialiased; user-select: none; -webkit-user-select: none; }

/* ---------- stage ---------- */
.deck { position: fixed; inset: 0; overflow: hidden; outline: none; }
.stage { position: absolute; left: 50%; top: 50%; width: 1920px; height: 1080px; transform-origin: 50% 50%;
    transform: translate(-50%, -50%) translate(var(--zx, 0px), var(--zy, 0px)) scale(calc(var(--s, .5) * var(--z, 1)));
    transition: transform .22s cubic-bezier(.2, .7, .2, 1); overflow: hidden; border-radius: 0; }
.deck.zoomed { cursor: grab; }
.deck.panning { cursor: grabbing; }
.deck.panning .stage { transition: none; }
.slide { position: absolute; inset: 0; overflow: hidden; opacity: 0; visibility: hidden;
    transform: scale(1.07); filter: blur(14px);
    transition: opacity .9s var(--ease), transform 1.2s var(--ease), filter .9s var(--ease), visibility 0s linear .9s; }
.slide.active { opacity: 1; visibility: visible; transform: none; filter: none; z-index: 2;
    transition: opacity .9s var(--ease), transform 1.2s var(--ease), filter .9s var(--ease), visibility 0s; }
.slide.out-next { transform: scale(.92) translateX(-120px); }
.slide.out-prev { transform: scale(.92) translateX(120px); }
.slide.in-prev:not(.active) { transform: scale(1.07) translateX(-120px); }
@media (prefers-reduced-motion: reduce) { .slide, .slide.active { transition: opacity .3s; transform: none; filter: none; } }

/* ---------- backgrounds ---------- */
.light { background: linear-gradient(135deg, #FFFFFF 0%, #F2F8FF 52%, #DCEBFF 100%); }
.dark { background: radial-gradient(1400px 800px at 75% 20%, rgba(76,195,255,.18), transparent 60%),
                    radial-gradient(1100px 900px at 5% 100%, rgba(37,99,235,.30), transparent 55%),
                    linear-gradient(160deg, #081426 0%, #0A1B33 45%, #102A4E 100%); color: #fff; }
.aurora { position: absolute; inset: -20%; pointer-events: none; z-index: 0; }
.aurora i { position: absolute; border-radius: 50%; filter: blur(90px); opacity: .55; animation: drift 18s ease-in-out infinite alternate; }
.aurora i:nth-child(1) { width: 820px; height: 820px; left: 62%; top: -6%; background: #BFE6FF; }
.aurora i:nth-child(2) { width: 700px; height: 700px; left: -6%; top: 58%; background: #CFE0FF; animation-duration: 22s; animation-delay: -6s; }
.aurora i:nth-child(3) { width: 520px; height: 520px; left: 38%; top: 40%; background: #E3F2FF; animation-duration: 26s; animation-delay: -12s; }
.dark .aurora i { opacity: .22; }
.dark .aurora i:nth-child(1) { background: #2563EB; } .dark .aurora i:nth-child(2) { background: #4CC3FF; } .dark .aurora i:nth-child(3) { background: #16386B; }
@keyframes drift { 0% { transform: translate(0, 0) scale(1); } 50% { transform: translate(-80px, 60px) scale(1.12); } 100% { transform: translate(60px, -40px) scale(.94); } }
.dots { position: absolute; inset: 0; pointer-events: none; z-index: 0; opacity: .5;
    background-image: radial-gradient(rgba(37,99,235,.16) 1.6px, transparent 1.6px); background-size: 44px 44px;
    -webkit-mask-image: radial-gradient(1200px 700px at 70% 30%, #000, transparent); mask-image: radial-gradient(1200px 700px at 70% 30%, #000, transparent); }
.dark .dots { background-image: radial-gradient(rgba(255,255,255,.10) 1.6px, transparent 1.6px); }
.slide > .wrap { position: absolute; inset: 0; z-index: 1; padding: 92px 120px 90px; }

/* ---------- chrome on every light slide ---------- */
.brand { position: absolute; right: 70px; top: 52px; z-index: 3; background: #fff; border-radius: 16px; padding: 11px 16px;
    box-shadow: 0 10px 30px rgba(10,27,51,.10); }
.brand img { display: block; height: 50px; width: auto; }
.foot { position: absolute; left: 120px; bottom: 46px; z-index: 3; font-size: 20px; color: var(--muted); letter-spacing: .02em; }
.dark .foot { color: rgba(255,255,255,.55); }
.kicker { font-size: 22px; font-weight: 600; letter-spacing: .22em; text-transform: uppercase; color: var(--blue); margin-bottom: 14px; }
.dark .kicker { color: #8FD8FF; }
.title { font-size: 66px; font-weight: 700; line-height: 1.18; color: var(--navy); max-width: 1500px; }
.title .hl, .hl { background: linear-gradient(100deg, #0A1B33 0%, #2563EB 45%, #4CC3FF 60%, #2563EB 75%, #0A1B33 100%);
    background-size: 250% 100%; -webkit-background-clip: text; background-clip: text; color: transparent; animation: shine 7s linear infinite; }
.dark .hl { background-image: linear-gradient(100deg, #FFFFFF 0%, #8FD8FF 40%, #F3DFA0 55%, #8FD8FF 70%, #FFFFFF 100%); }
@keyframes shine { to { background-position: -250% 0; } }
.bar { width: 96px; height: 8px; border-radius: 4px; background: var(--grad); margin: 26px 0 0; }
.lead { font-size: 30px; line-height: 1.55; color: var(--muted); font-weight: 400; }
.dark .lead { color: rgba(255,255,255,.78); }

/* ---------- reusable pieces ---------- */
.card { position: relative; background: rgba(255,255,255,.86); border: 1.5px solid var(--line); border-radius: 30px;
    box-shadow: 0 24px 60px rgba(37,99,235,.12); backdrop-filter: blur(6px); overflow: hidden;
    transform: perspective(1200px) rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg)); transition: transform .5s var(--ease), box-shadow .5s; }
.card.tilt:hover { box-shadow: 0 34px 80px rgba(37,99,235,.20); }
.card::after { content: ""; position: absolute; inset: 0; pointer-events: none; border-radius: inherit;
    background: radial-gradient(500px 260px at var(--gx, 50%) var(--gy, -40%), rgba(255,255,255,.75), transparent 60%); opacity: 0; transition: opacity .4s; }
.card.tilt:hover::after { opacity: .9; }
.card.solid { background: var(--grad); border-color: transparent; color: #fff; box-shadow: 0 30px 70px rgba(37,99,235,.38); }
.num { font-weight: 700; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.pill { display: inline-flex; align-items: center; gap: 14px; padding: 12px 26px; border-radius: 999px; font-size: 22px; font-weight: 600;
    background: rgba(37,99,235,.08); color: var(--blue); border: 1.5px solid rgba(37,99,235,.18); }
.dark .pill { background: rgba(255,255,255,.08); color: #CDEBFF; border-color: rgba(143,216,255,.35); }
.pill.gold { background: rgba(217,178,74,.14); color: #F3DFA0; border-color: rgba(217,178,74,.45); }
.check { flex: none; width: 46px; height: 46px; border-radius: 50%; background: var(--grad); display: grid; place-items: center; box-shadow: 0 8px 20px rgba(37,99,235,.35); }
.check svg { width: 26px; height: 26px; }
.check path { fill: none; stroke: #fff; stroke-width: 3.2; stroke-linecap: round; stroke-linejoin: round; stroke-dasharray: 1; stroke-dashoffset: 1;
    transition: stroke-dashoffset .6s var(--ease) calc(var(--d, 0s) + .35s); }
.active .check path { stroke-dashoffset: 0; }

/* ---------- entrance animations (replay every time a slide becomes active) ---------- */
[data-a] { opacity: 0; transition: opacity .9s var(--ease) var(--d, 0s), transform 1.1s var(--ease) var(--d, 0s),
    filter 1s var(--ease) var(--d, 0s), clip-path 1.2s var(--ease) var(--d, 0s); }
[data-a="up"] { transform: translateY(70px); }
[data-a="down"] { transform: translateY(-70px); }
[data-a="left"] { transform: translateX(-110px); }
[data-a="right"] { transform: translateX(110px); }
[data-a="zoom"] { transform: scale(.72); }
[data-a="pop"] { transform: scale(.3); transition-timing-function: var(--ease), var(--spring), var(--ease), var(--ease); }
[data-a="blur"] { transform: scale(1.12); filter: blur(24px); }
[data-a="reveal"] { transform: translateY(40px); clip-path: inset(0 0 100% 0); }
[data-a="flip"] { transform: perspective(1400px) rotateX(75deg) translateY(60px); transform-origin: 50% 100%; }
.slide.active [data-a] { opacity: 1; transform: none; filter: none; clip-path: inset(-20% -20% -20% -20%); }
.slide:not(.active) [data-a] { transition-duration: 0s; transition-delay: 0s; }
@media (prefers-reduced-motion: reduce) { [data-a] { transform: none !important; filter: none !important; clip-path: none !important; transition: opacity .3s !important; } }

/* ---------- cover (dark, live motion) ---------- */
.film { position: absolute; inset: 0; width: 1920px; height: 1080px; z-index: 0; }
.cover .wrap { padding: 0; }
.cover .logo-card { position: absolute; left: 120px; top: 92px; background: #fff; border-radius: 24px; padding: 18px 24px;
    box-shadow: 0 20px 60px rgba(0,0,0,.35); }
.cover .logo-card img { display: block; height: 92px; width: auto; }
.cover .copy { position: absolute; left: 120px; top: 330px; width: 900px; }
.cover h1 { font-size: 92px; font-weight: 700; line-height: 1.12; margin: 18px 0 26px; }
.cover .founders { margin-top: 38px; }
.cover .founders b { color: #fff; font-weight: 700; }
.cover .caps { position: absolute; left: 120px; bottom: 150px; width: 980px; height: 200px; z-index: 2; }
.cover .cap { position: absolute; left: 0; bottom: 0; opacity: 0; transform: translateY(30px); transition: opacity .7s var(--ease), transform .9s var(--ease); }
.cover .cap.on { opacity: 1; transform: none; }
.cover .cap.out { opacity: 0; transform: translateY(-24px); }
.cover .cap small { display: block; font-size: 22px; letter-spacing: .3em; color: #8FD8FF; font-weight: 600; margin-bottom: 14px; }
.cover .cap b { display: block; font-size: 64px; line-height: 1.15; font-weight: 700; }
.cover .cap span { display: block; font-size: 30px; color: rgba(255,255,255,.72); margin-top: 12px; }
.cover .segs { position: absolute; left: 120px; bottom: 82px; display: flex; gap: 22px; z-index: 2; }
.cover .segs div { width: 190px; font-size: 16px; letter-spacing: .24em; color: rgba(255,255,255,.55); font-weight: 600; }
.cover .segs div i { display: block; height: 3px; margin-top: 10px; background: rgba(255,255,255,.16); border-radius: 2px; overflow: hidden; }
.cover .segs div i::after { content: ""; display: block; height: 100%; background: var(--grad); transform: scaleX(var(--p, 0)); transform-origin: 0 50%; }
.cover .hold { transition: opacity 1s var(--ease), transform 1.2s var(--ease), filter 1s var(--ease); }
.cover.playing .hold { opacity: 0; transform: translateY(40px); filter: blur(10px); pointer-events: none; }
.cover:not(.playing) .caps, .cover:not(.playing) .segs { opacity: 0; transition: opacity .8s; }
.cover .skip { position: absolute; right: 120px; bottom: 76px; z-index: 3; font-size: 18px; color: rgba(255,255,255,.6); letter-spacing: .08em; }
.cover:not(.playing) .skip { opacity: 0; }

/* ---------- slide-specific layouts ---------- */
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 34px; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.grid4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 26px; }
.q { padding: 44px 48px; min-height: 300px; }
.q .num { font-size: 76px; line-height: 1; }
.q p { font-size: 34px; line-height: 1.45; color: var(--navy); font-weight: 500; margin-top: 22px; }

.cv { display: grid; grid-template-columns: 420px 90px 1fr 90px 440px; align-items: stretch; margin-top: 70px; }
.cv .side { padding: 44px 40px; }
.cv .side h3 { font-size: 38px; line-height: 1.25; color: var(--navy); }
.cv .side p { font-size: 25px; line-height: 1.55; color: var(--muted); margin-top: 22px; }
.cv .solid h3, .cv .solid p { color: #fff; }
.cv .arrow { display: grid; place-items: center; }
.cv .arrow svg { width: 70px; height: 40px; }
.cv .arrow path { fill: none; stroke: var(--blue); stroke-width: 4; stroke-linecap: round; stroke-dasharray: 1; stroke-dashoffset: 1; transition: stroke-dashoffset .9s var(--ease) var(--d, 0s); }
.active .cv .arrow path { stroke-dashoffset: 0; }
.cv .chips { display: flex; flex-wrap: wrap; gap: 16px; align-content: center; justify-content: center; padding: 0 10px; }
.cv .chips span { padding: 16px 28px; border-radius: 999px; background: #fff; border: 1.5px solid var(--line); font-size: 25px; font-weight: 600; color: var(--blue);
    box-shadow: 0 10px 28px rgba(37,99,235,.10); }
.cv-goal { margin-top: 60px; font-size: 31px; line-height: 1.55; color: var(--ink); font-weight: 500; max-width: 1560px; }

.road { position: relative; margin-top: 110px; height: 520px; }
.road svg.track { position: absolute; left: 0; top: 52px; width: 1680px; height: 12px; overflow: visible; }
.road svg.track path { fill: none; stroke: url(#roadgrad); stroke-width: 6; stroke-linecap: round; stroke-dasharray: 1; stroke-dashoffset: 1; transition: stroke-dashoffset 2.2s var(--ease) .3s; }
.active .road svg.track path { stroke-dashoffset: 0; }
.road .st { position: absolute; top: 0; width: 280px; text-align: center; }
.road .st .dot { width: 112px; height: 112px; margin: 0 auto; border-radius: 50%; background: var(--grad); color: #fff; font-size: 38px; font-weight: 700;
    display: grid; place-items: center; border: 8px solid #fff; box-shadow: 0 18px 40px rgba(37,99,235,.35); }
.road .st h4 { font-size: 30px; letter-spacing: .12em; color: var(--navy); margin-top: 30px; }
.road .st p { font-size: 23px; line-height: 1.5; color: var(--muted); margin-top: 14px; padding: 0 6px; }
.road-note { position: absolute; left: 120px; right: 120px; bottom: 140px; text-align: center; font-size: 32px; font-weight: 500; color: var(--ink); }

.eq { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 22px; margin-top: 120px; }
.eq .part { padding: 26px 40px; border-radius: 999px; background: #fff; border: 1.5px solid var(--line); font-size: 32px; font-weight: 700; color: var(--navy);
    box-shadow: 0 16px 40px rgba(37,99,235,.12); }
.eq .op { font-size: 50px; font-weight: 700; color: var(--blue); }
.eq-out { display: flex; justify-content: center; align-items: center; gap: 30px; margin-top: 58px; }
.eq-out .cap { padding: 34px 70px; border-radius: 999px; background: var(--grad); color: #fff; font-size: 46px; font-weight: 700;
    box-shadow: 0 30px 80px rgba(37,99,235,.45); animation: glow 3.2s ease-in-out infinite; }
@keyframes glow { 50% { box-shadow: 0 30px 110px rgba(76,195,255,.75); } }
.eq-p { text-align: center; font-size: 32px; line-height: 1.55; color: var(--ink); font-weight: 500; margin: 70px auto 0; max-width: 1400px; }

.svc { padding: 34px 32px; min-height: 330px; }
.svc .n { font-size: 26px; font-weight: 700; color: var(--blue); }
.svc h4 { font-size: 28px; line-height: 1.3; color: var(--navy); margin: 12px 0 14px; }
.svc p { font-size: 22px; line-height: 1.5; color: var(--muted); }

.oc { display: flex; align-items: center; gap: 24px; padding: 22px 30px; border-radius: 24px; }
.oc span { font-size: 28px; font-weight: 500; color: var(--navy); line-height: 1.35; }

.prod { display: grid; grid-template-columns: 640px 1fr; gap: 70px; align-items: center; height: 100%; }
.prod .plogo { height: 150px; width: auto; display: block; }
.prod .pname { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 26px; }
.prod .pname .soon { margin-left: 0; white-space: nowrap; }
.prod .pname img { height: 120px; width: 120px; }
.prod .pname b { font-size: 70px; color: var(--navy); white-space: nowrap; }
.prod .tag { font-size: 40px; line-height: 1.3; font-weight: 700; margin: 34px 0 34px; }
.prod ul { list-style: none; display: grid; gap: 22px; }
.prod li { display: flex; align-items: center; gap: 22px; font-size: 27px; line-height: 1.35; color: var(--ink); font-weight: 500; }
.prod.compact .tag { font-size: 34px; margin: 26px 0 22px; }
.prod.compact ul { gap: 11px; }
.prod.compact li { font-size: 23px; line-height: 1.3; }
.prod.compact .stats { margin: 0 0 22px; }
.prod .url { margin-top: 36px; font-size: 24px; font-weight: 600; color: var(--blue); }
.screen { position: relative; border-radius: 30px; overflow: hidden; background: #fff; aspect-ratio: 16 / 9;
    box-shadow: 0 50px 120px rgba(10,27,51,.28), 0 0 0 1.5px rgba(37,99,235,.14);
    transform: perspective(1600px) rotateY(calc(-8deg + var(--ry, 0deg))) rotateX(calc(3deg + var(--rx, 0deg))); transition: transform .6s var(--ease); }
.screen video, .screen img { width: 100%; height: 100%; object-fit: cover; display: block; }
.screen-glow { position: absolute; inset: 8% -6% -10% 6%; background: var(--grad); filter: blur(90px); opacity: .35; border-radius: 40px; z-index: -1; }
.soon { display: inline-flex; margin-left: 18px; vertical-align: middle; font-size: 20px; padding: 8px 20px; border-radius: 999px; background: rgba(217,178,74,.16);
    color: #9A7212; border: 1.5px solid rgba(217,178,74,.5); font-weight: 600; letter-spacing: .02em; }
.stats { display: flex; gap: 22px; margin: 6px 0 30px; }
.stats div { flex: 1; padding: 20px 22px; border-radius: 22px; background: #fff; border: 1.5px solid var(--line); box-shadow: 0 12px 30px rgba(37,99,235,.10); }
.stats b { display: block; font-size: 52px; line-height: 1; }
.stats span { display: block; font-size: 19px; color: var(--muted); margin-top: 8px; line-height: 1.3; }

.ecm-stage { position: relative; height: 820px; }
.ecm-stage svg { width: 100%; height: 100%; overflow: visible; }
.ring { transform-origin: 600px 410px; animation: ring 3.6s ease-out infinite; }
.ring.r2 { animation-delay: 1.2s; } .ring.r3 { animation-delay: 2.4s; }
@keyframes ring { 0% { transform: scale(.55); opacity: .7; } 100% { transform: scale(1.65); opacity: 0; } }
.orbit { transform-origin: 600px 410px; animation: spin 38s linear infinite; }
.orbit .sat { transform-box: fill-box; transform-origin: center; animation: spin 38s linear infinite reverse; }
@keyframes spin { to { transform: rotate(360deg); } }

.suite { padding: 38px 40px; min-height: 290px; }
.suite h4 { font-size: 34px; color: var(--navy); }
.suite p { font-size: 24px; line-height: 1.5; color: var(--muted); margin-top: 16px; }
.suite.solid h4, .suite.solid p { color: #fff; }

.who { display: grid; grid-template-columns: 1fr 640px; gap: 70px; margin-top: 50px; }
.who .lead { font-size: 29px; color: var(--ink); font-weight: 500; margin-bottom: 30px; }
.who ul { list-style: none; display: grid; gap: 24px; }
.who li { display: flex; align-items: center; gap: 22px; font-size: 28px; color: var(--navy); font-weight: 500; line-height: 1.35; }
.roles { padding: 44px 44px; }
.roles h4 { font-size: 32px; color: var(--navy); margin-bottom: 30px; }
.roles .chips { display: flex; flex-wrap: wrap; gap: 16px; }
.roles .chips span { padding: 14px 26px; border-radius: 999px; background: #EEF5FF; color: var(--blue); font-size: 24px; font-weight: 600; }

.closing .wrap { display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; }
.closing .logo-card { background: #fff; border-radius: 26px; padding: 22px 28px; box-shadow: 0 20px 60px rgba(0,0,0,.35); }
.closing .logo-card img { height: 112px; display: block; }
.closing h2 { font-size: 68px; line-height: 1.2; margin: 60px 0 24px; max-width: 1720px; }
.closing .lead { max-width: 1300px; }
.contacts { display: flex; gap: 34px; margin-top: 64px; }
.contacts div { padding: 30px 48px; border-radius: 28px; background: rgba(255,255,255,.08); border: 1.5px solid rgba(143,216,255,.3); min-width: 360px; backdrop-filter: blur(8px); }
.contacts small { display: block; font-size: 20px; color: #8FD8FF; letter-spacing: .12em; font-weight: 600; }
.contacts b { display: block; font-size: 32px; color: #fff; margin-top: 10px; }
.closing .quote { margin-top: 56px; font-size: 30px; color: var(--gold2); font-weight: 500; }
.sparks { position: absolute; inset: 0; width: 1920px; height: 1080px; z-index: 0; }

/* ---------- controls ---------- */
.ui { position: fixed; z-index: 20; pointer-events: none; inset: 0; }
.ui > * { pointer-events: auto; }
.progress { position: fixed; left: 0; top: 0; height: 4px; background: var(--grad); transform-origin: 0 50%; transform: scaleX(var(--p, 0)); transition: transform .6s var(--ease); z-index: 21; }
.ctrl { position: fixed; right: 18px; bottom: 16px; display: flex; align-items: center; gap: 8px; transition: opacity .5s; }
.ctrl button { width: 42px; height: 42px; border-radius: 50%; border: 0; cursor: pointer; display: grid; place-items: center; font: inherit; font-size: 18px;
    background: rgba(10,27,51,.72); color: #fff; backdrop-filter: blur(6px); box-shadow: 0 6px 18px rgba(0,0,0,.2); }
.ctrl button:hover { background: var(--blue); }
.ctrl button:focus-visible { outline: 3px solid var(--sky); outline-offset: 2px; }
.ctrl .count { min-width: 64px; text-align: center; font-size: 14px; font-weight: 600; color: #fff; background: rgba(10,27,51,.72); padding: 8px 12px; border-radius: 999px; }
.idle .ctrl, .idle .hint { opacity: 0; }
.hint { position: fixed; left: 50%; bottom: 18px; transform: translateX(-50%); font-size: 13px; color: #fff; background: rgba(10,27,51,.65); padding: 8px 16px;
    border-radius: 999px; transition: opacity .6s; white-space: nowrap; }
.toast { position: fixed; left: 50%; top: 24px; transform: translate(-50%, -20px); opacity: 0; background: rgba(10,27,51,.85); color: #fff; padding: 10px 22px;
    border-radius: 999px; font-size: 15px; font-weight: 600; transition: opacity .3s, transform .3s; z-index: 30; pointer-events: none; }
.toast.on { opacity: 1; transform: translate(-50%, 0); }

/* ---------- presenter modes: flashlight / laser ---------- */
/* the beam is fully clear in the middle and only darkens through a wide, feathered rim */
.torch { position: fixed; inset: 0; z-index: 15; pointer-events: none; opacity: 0; transition: opacity .35s;
    background: radial-gradient(circle var(--tr, 260px) at var(--mx, 50%) var(--my, 50%),
        rgba(2,6,14,0) 0, rgba(2,6,14,0) 55%, rgba(2,6,14,.16) 67%, rgba(2,6,14,.46) 79%, rgba(2,6,14,.78) 90%, rgba(2,6,14,.93) 100%); }
.mode-torch .card::after, .mode-laser .card::after { opacity: 0 !important; }   /* no hover glare washing out the lit text */
.mode-torch .torch { opacity: 1; }
.laser { position: fixed; z-index: 16; width: 16px; height: 16px; margin: -8px 0 0 -8px; border-radius: 50%; pointer-events: none; opacity: 0;
    background: radial-gradient(circle, #fff 0 18%, #ff2b2b 30%, #ff0000 60%, rgba(255,0,0,0) 72%);
    box-shadow: 0 0 14px 6px rgba(255,30,30,.75), 0 0 40px 14px rgba(255,0,0,.35); transform: translate(var(--lx, -100px), var(--ly, -100px)); }
.mode-laser .laser { opacity: 1; }
.trail { position: fixed; inset: 0; z-index: 16; pointer-events: none; }
.mode-torch, .mode-torch *, .mode-laser, .mode-laser * { cursor: none !important; }