/* 一根红线：从黑白影棚（现代）一路牵到四合院（中式）。背景色随滚动连续过渡。 */
:root {
  --charcoal: #262523;
  --bone: #ece7df;
  --linen: #efebe4;
  --paper: #e8dfcf;
  --ink: #1f1c19;
  --mute: #8a837a;
  --red: #b0261c;
  --vermilion: #9c1f15;
  --gold: #c2a063;
  --brick: #9a958d;

  /* 字体组合 A：摩登雅宋 */
  --en-d: "Bodoni Moda";
  --cn-d: "ZCOOL XiaoWei";
  --cn-d-w: 400;
  --cn-b: "Noto Serif SC";
  --label: "Jost";
  --en-scale: 1;

  --ease: cubic-bezier(.2, .7, .2, 1);
  --vh: 100vh;
}
@supports (height: 100svh) { :root { --vh: 100svh; } }

/* 组合 B：古籍刻本 */
:root[data-font="b"] { --en-d: "Gilda Display"; --cn-d: "Noto Serif SC"; --cn-d-w: 900; --en-scale: .96; }
/* 组合 C：手札行书 */
:root[data-font="c"] { --en-d: "Instrument Serif"; --cn-d: "Zhi Mang Xing"; --cn-d-w: 400; --en-scale: 1.08; }

* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html { background: var(--charcoal); }
body {
  background: var(--charcoal); color: var(--bone);
  font-family: var(--cn-b), "Songti SC", "STSong", "SimSun", serif; font-weight: 300;
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
body.locked { overflow: hidden; height: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
figure { margin: 0; }
.vt { writing-mode: vertical-rl; text-orientation: upright; }

.en-d { font-family: var(--en-d), "Didot", "Times New Roman", serif; font-weight: 400; }
.cn-d { font-family: var(--cn-d), "Songti SC", "STSong", serif; font-weight: var(--cn-d-w); }
.label { font-family: var(--label), "Helvetica Neue", Arial, sans-serif; font-weight: 300; font-size: 10.5px; letter-spacing: .32em; text-transform: uppercase; }

.grain {
  position: fixed; inset: -50%; z-index: 60; pointer-events: none; opacity: .07;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain 1s steps(4) infinite;
}
@keyframes grain { 25% { transform: translate(-5%, 4%); } 50% { transform: translate(4%, -6%); } 75% { transform: translate(-2%, 7%); } }

/* ---------- 红线 ---------- */
.thread { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 1; pointer-events: none; overflow: visible; }
.thread path, .g-thread, .mg-in, .mg-ring { fill: none; stroke: var(--red); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }

/* ---------- 开场 ---------- */
#intro {
  position: fixed; inset: 0; z-index: 40; background: var(--charcoal); color: var(--bone);
  display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center;
  padding: 0 24px;
}
.in-top { color: var(--mute); }
.in-names { margin-top: 5vh; display: flex; flex-direction: column; align-items: center; line-height: .95; }
.in-n { font-size: calc(clamp(54px, 17vw, 96px) * var(--en-scale)); letter-spacing: -.01em; }
.in-amp { font-style: italic; font-size: 30px; color: var(--mute); margin: 14px 0 8px; line-height: 1; }
.in-cn { margin-top: 4vh; font-size: 15px; letter-spacing: .5em; text-indent: .5em; display: flex; align-items: center; gap: 14px; }
.in-cn i { width: 20px; height: 1px; background: var(--mute); }
.in-to { margin-top: 2.4vh; font-size: 12px; letter-spacing: .2em; color: var(--mute); }
.in-to b { font-weight: 500; color: var(--bone); }
#dot { position: relative; margin-top: 8vh; width: 48px; height: 48px; }
#dot .core { position: absolute; left: 50%; top: 50%; width: 10px; height: 10px; margin: -5px; border-radius: 50%; background: var(--red); box-shadow: 0 0 14px rgba(176,38,28,.7); }
#dot .halo { position: absolute; left: 50%; top: 50%; width: 10px; height: 10px; margin: -5px; border-radius: 50%; border: 1px solid var(--red); animation: halo 2.4s ease-out infinite; }
.in-hint { margin-top: 10px; color: var(--mute); font-size: 9.5px; }
.in-line { position: absolute; left: 50%; width: 1.6px; margin-left: -.8px; height: 0; background: var(--red); }
@keyframes halo { 0% { transform: scale(1); opacity: .9; } 100% { transform: scale(4.4); opacity: 0; } }

.rv-in { opacity: 0; transform: translateY(14px); filter: blur(6px); transition: opacity 1.4s var(--ease) var(--d), transform 1.4s var(--ease) var(--d), filter 1.4s var(--ease) var(--d); }
body.ready .rv-in { opacity: 1; transform: none; filter: none; }

/* ---------- 通用 ---------- */
.sec { position: relative; min-height: var(--vh); padding: 16vh 8vw; overflow: hidden; color: var(--ink); }
.sec.dark { color: var(--bone); }
.sec > *:not(.thread) { position: relative; z-index: 2; }

.photo { position: relative; overflow: hidden; background: #d9d2c6; }
.photo img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; display: block; }
.mono img { filter: grayscale(1) contrast(1.06); }
.photo.empty { display: flex; align-items: center; justify-content: center; }
.photo.empty::after {
  content: attr(data-label); white-space: pre; text-align: center;
  font-family: var(--label), Arial, sans-serif; font-size: 10px; letter-spacing: .3em; line-height: 2;
  color: rgba(31,28,25,.45); border: 1px solid rgba(31,28,25,.2); padding: 8px 12px;
}
.dark .photo.empty { background: #3a3835; }
.dark .photo.empty::after { color: rgba(236,231,223,.5); border-color: rgba(236,231,223,.22); }

.rv { opacity: 0; transform: translateY(28px); transition: opacity 1.2s var(--ease), transform 1.2s var(--ease); }
.rv.in { opacity: 1; transform: none; }
.rv.d1 { transition-delay: .15s; } .rv.d2 { transition-delay: .3s; } .rv.d3 { transition-delay: .45s; } .rv.d4 { transition-delay: .6s; }

/* ---------- 第一幕 ---------- */
.hero { height: var(--vh); padding: 0; }
.hero > .hero-ph { position: absolute; inset: 0; z-index: 0; }
.hero > .thread { z-index: 1; }
.hero-shade { position: absolute !important; inset: 0; z-index: 1 !important; background: linear-gradient(to top, rgba(20,19,18,.97) 0%, rgba(20,19,18,.88) 24%, rgba(20,19,18,.35) 46%, transparent 62%); }
.hero-type { position: absolute !important; left: 8vw; right: 8vw; bottom: calc(9vh + env(safe-area-inset-bottom)); z-index: 3 !important; }
.hero-type .label { color: rgba(236,231,223,.6); }
.hero-type h1 { margin-top: 10px; font-size: calc(clamp(40px, 11.5vw, 72px) * var(--en-scale)); line-height: 1; letter-spacing: -.01em; }
.hero-type h1 span { display: block; }
.hero-type h1 em { font-style: italic; color: var(--mute); font-size: .6em; margin-right: .2em; }
.hero-cn { margin-top: 14px; font-size: 14px; letter-spacing: .4em; color: rgba(236,231,223,.75); }

.words { display: flex; flex-direction: column; justify-content: center; }
.words .label { color: var(--mute); }
.big-quote { margin-top: 4vh; font-size: calc(clamp(30px, 8.4vw, 52px) * var(--en-scale)); line-height: 1.16; font-style: italic; max-width: 14em; }
.quote-cn { margin-top: 5vh; font-size: 15px; letter-spacing: .5em; color: rgba(236,231,223,.7); }

.duo { min-height: calc(var(--vh) * 1.25); }
.duo figure { position: absolute !important; }
.duo .photo { width: 100%; aspect-ratio: 3 / 4; }
.duo figcaption { margin-top: 10px; color: var(--mute); }
.duo-a { left: 8vw; top: 10vh; width: 56vw; max-width: 340px; }
.duo-b { right: 8vw; top: 56vh; width: 48vw; max-width: 300px; text-align: right; }

/* ---------- 第二幕 ---------- */
.colour .label { color: var(--mute); }
.colour-h { margin-top: 3vh; font-size: calc(clamp(44px, 13vw, 84px) * var(--en-scale)); line-height: 1; }
.colour-h em { font-style: italic; color: var(--red); }
.colour-cn { margin-top: 2.4vh; font-size: 17px; letter-spacing: .3em; }
.colour-ph { margin-top: 7vh; width: 100%; aspect-ratio: 4 / 5; max-width: 560px; }
.colour-ph img { filter: grayscale(var(--g, 1)); transform: scale(var(--s, 1.12)); }

.hs { height: var(--vh); padding: 0; }
.hs-head { position: absolute !important; left: 8vw; top: calc(10vh + env(safe-area-inset-top)); display: flex; align-items: baseline; gap: 14px; }
.hs-head .en-d { font-size: calc(40px * var(--en-scale)); font-style: italic; }
.hs-head .cn-d { font-size: 16px; letter-spacing: .3em; }
.hs-track { position: absolute !important; left: 0; top: 24vh; height: 60vh; display: flex; gap: 9vw; padding: 0 8vw; width: max-content; will-change: transform; }
.hs-card { position: relative; z-index: 2; display: flex; flex-direction: column; }
.hs-card .photo { flex: 1; }
.hs-card figcaption { margin-top: 12px; display: flex; align-items: baseline; gap: 10px; }
.hs-card figcaption .en-d { font-size: 20px; font-style: italic; }
.hs-card figcaption .cn-d { font-size: 14px; letter-spacing: .2em; }
.hs-card.c1 { width: 62vw; height: 86%; align-self: flex-start; }
.hs-card.c2 { width: 48vw; height: 62%; align-self: flex-end; }
.hs-card.c3 { width: 58vw; height: 94%; align-self: center; }
.hs-card.c4 { width: 52vw; height: 70%; align-self: flex-end; }
@media (min-width: 700px) { .hs-card.c1 { width: 380px; } .hs-card.c2 { width: 300px; } .hs-card.c3 { width: 360px; } .hs-card.c4 { width: 320px; } }

.m6 { display: flex; flex-direction: column; align-items: center; text-align: center; }
.m6-ph { width: 84vw; max-width: 460px; aspect-ratio: 4 / 5; }
.m6-cn { margin-top: 6vh; font-size: 30px; line-height: 1.5; letter-spacing: .2em; }
.m6-en { margin-top: 12px; font-size: 15px; font-style: italic; color: var(--mute); }

/* ---------- 月洞门 ---------- */
.mg { height: var(--vh); padding: 0; }
.mg > * { position: absolute !important; inset: 0; }
.mg-ph.empty { background: #6b5844; }
.mg-ph.empty::after { color: rgba(255,255,255,.6); border-color: rgba(255,255,255,.3); }
.mg-wall {
  --r: 34vw;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(255,255,255,.55), transparent 60%),
    radial-gradient(ellipse at 80% 85%, rgba(150,130,100,.18), transparent 55%),
    #ece5d7;
  -webkit-mask-image: radial-gradient(circle at 50% 50%, transparent var(--r), #000 calc(var(--r) + 1px));
  mask-image: radial-gradient(circle at 50% 50%, transparent var(--r), #000 calc(var(--r) + 1px));
}
.mg-wall::after { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 9vh; background: repeating-linear-gradient(90deg, #4a4642 0 13px, #35322f 13px 16px); border-bottom: 5px solid #2c2a27; }
.mg-svg { width: 100%; height: 100%; overflow: visible; pointer-events: none; }
.mg-ring { stroke-width: 2; }
.mg-stone { fill: none; stroke: #a49d92; stroke-width: 16; }
.mg-title { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 20px; color: #fff; text-shadow: 0 2px 24px rgba(0,0,0,.45); opacity: 0; pointer-events: none; }
.mg-title .cn-d { font-size: 40px; letter-spacing: .4em; }
.mg-title .label { font-size: 10px; }

/* ---------- 第三幕 ---------- */
.album { padding-top: 14vh; padding-bottom: 14vh; }
.album-h { color: var(--mute); margin-bottom: 8vh; }
.leaf { display: flex; align-items: flex-start; gap: 5vw; margin-bottom: 13vh; }
.leaf.l2, .leaf.l4 { flex-direction: row-reverse; }
.leaf.l3 { margin-left: 6vw; }
.mat { background: #f6efe1; padding: 10px; box-shadow: 0 18px 40px -22px rgba(60,40,20,.45); }
.mat .photo { width: 58vw; max-width: 340px; aspect-ratio: 3 / 4; background: #d8cbb3; }
.leaf figcaption { display: flex; gap: 12px; padding-top: 6px; }
.leaf figcaption b { font-size: 19px; letter-spacing: .3em; font-weight: var(--cn-d-w); }
.leaf figcaption span { font-size: 11px; letter-spacing: .2em; color: var(--mute); }

.hand { height: var(--vh); padding: 0; }
.hand-head { position: absolute !important; left: 8vw; top: calc(9vh + env(safe-area-inset-top)); display: flex; align-items: baseline; gap: 14px; }
.hand-head .cn-d { font-size: 30px; letter-spacing: .3em; }
.hand-head .label { color: var(--mute); }
.hand-track { position: absolute !important; left: 6vw; top: 22vh; height: 62vh; display: flex; align-items: stretch; width: max-content; will-change: transform; }
.roll { width: 16px; margin: -3vh 0; border-radius: 8px; background: linear-gradient(90deg, #3c2416, #7a4d2f 45%, #3c2416); box-shadow: 0 8px 18px rgba(0,0,0,.3); }
.silk { position: relative; padding: 4.5vh 0; background: #c7ad7f; background-image: repeating-linear-gradient(45deg, rgba(255,255,255,.07) 0 6px, transparent 6px 12px); }
.paper { position: relative; z-index: 2; height: 100%; display: flex; align-items: center; gap: 7vw; padding: 0 9vw; background: #f4ecdc; }
.yinshou { font-size: 46px; letter-spacing: .25em; color: var(--ink); }
.hp { width: 48vw; max-width: 280px; height: 66%; }
.hp.tall { height: 86%; }
.hp .photo { width: 100%; height: 100%; background: #dccfb6; }
.ins { font-size: 18px; letter-spacing: .35em; color: #4a4038; }
.ba { display: flex; align-items: center; gap: 14px; font-size: 13px; letter-spacing: .3em; color: #4a4038; }
.mini-seal { writing-mode: horizontal-tb; width: 28px; height: 28px; display: flex; align-items: center; justify-content: center; background: var(--red); color: #f6e9d6; font-style: normal; font-size: 18px; border-radius: 2px; }
.hand-thread { z-index: 3; }

/* ---------- 四合院 ---------- */
.gate { height: var(--vh); padding: 0; }
.g-stage { position: absolute !important; inset: 0; transform-origin: 50% 58%; }
.g-stage > * { position: absolute; }
.g-wall {
  inset: 0;
  background-color: var(--brick);
  background-image:
    repeating-linear-gradient(0deg, rgba(40,36,32,.16) 0 1px, transparent 1px 15px),
    repeating-linear-gradient(90deg, rgba(40,36,32,.1) 0 1px, transparent 1px 32px);
}
.g-roof {
  left: -4%; right: -4%; top: calc(14vh + env(safe-area-inset-top)); height: 9vh;
  background: repeating-linear-gradient(90deg, #3d3a36 0 15px, #2a2826 15px 19px);
  border-bottom: 7px solid #24221f; box-shadow: 0 10px 18px rgba(0,0,0,.25);
  clip-path: polygon(0 100%, 3% 0, 97% 0, 100% 100%);
}
.g-plaque { left: 50%; top: calc(26vh + env(safe-area-inset-top)); transform: translateX(-50%); padding: 6px 22px; background: #1d1a17; border: 2px solid var(--gold); color: var(--gold); z-index: 3; }
.g-plaque .cn-d { font-size: 20px; letter-spacing: .5em; text-indent: .5em; }
.g-frame {
  left: 50%; top: calc(33vh + env(safe-area-inset-top)); width: min(66vw, 320px); height: 46vh; transform: translateX(-50%);
  background: #2b1a12; padding: 8px; perspective: 900px;
  box-shadow: 0 0 0 6px #5c3524, 0 20px 40px rgba(0,0,0,.35);
}
.g-inside { position: absolute; inset: 8px; overflow: hidden; background: radial-gradient(ellipse at 50% 70%, #fff3db 0%, #f0cf98 40%, #b97a3e 100%); display: flex; align-items: center; justify-content: center; }
.g-glow { position: absolute; inset: 0; background: radial-gradient(circle at 50% 60%, rgba(255,255,255,.8), transparent 60%); }
.g-inside p { position: relative; font-size: 22px; letter-spacing: .6em; text-indent: .6em; color: #5a2a14; }
.g-door {
  position: absolute; top: 8px; bottom: 8px; width: calc(50% - 8px); backface-visibility: hidden;
  background-image:
    radial-gradient(circle, #e8c47c 0 2.6px, #8b6326 3.2px, transparent 3.9px),
    linear-gradient(90deg, #8a1a11, #a8251a 45%, #8a1a11);
  background-size: 20% 10.5%, 100% 100%;
  background-position: center 5%, 0 0;
  box-shadow: inset 0 0 0 3px rgba(0,0,0,.18), inset 0 0 30px rgba(0,0,0,.25);
}
.g-door.l { left: 8px; transform-origin: left center; }
.g-door.r { right: 8px; transform-origin: right center; }
.ring { position: absolute; top: 50%; width: 22px; height: 22px; margin-top: -11px; border-radius: 50%; background: radial-gradient(circle at 40% 35%, #f3d590, #b08431 70%); box-shadow: 0 2px 4px rgba(0,0,0,.4); }
.ring::after { content: ""; position: absolute; left: 50%; top: 14px; width: 18px; height: 18px; margin-left: -9px; border-radius: 50%; border: 2.5px solid #c59a45; }
.g-door.l .ring { right: 8px; }
.g-door.r .ring { left: 8px; }
.g-steps { left: 50%; top: calc(79vh + env(safe-area-inset-top)); width: min(84vw, 400px); height: 7vh; transform: translateX(-50%); background: linear-gradient(#c9c3b8 0 33%, #b4ada1 33% 34%, #c2bcb0 34% 66%, #aaa397 66% 67%, #bab3a7 67%); }
.g-drum { top: calc(68vh + env(safe-area-inset-top)); width: 11vw; max-width: 54px; aspect-ratio: 1; border-radius: 50%; background: radial-gradient(circle at 40% 35%, #d6d1c8, #8f8a82); box-shadow: 0 4px 10px rgba(0,0,0,.25); }
.g-drum.l { left: calc(50% - min(33vw, 160px) - 14vw); }
.g-drum.r { left: calc(50% + min(33vw, 160px) + 3vw); }
.g-frame { z-index: 1; }
.g-svg { inset: 0; width: 100%; height: 100%; overflow: visible; z-index: 4; pointer-events: none; filter: drop-shadow(0 0 1.2px #fff1d6) drop-shadow(0 0 2px rgba(255,236,200,.7)); }
.g-cap { position: absolute !important; left: 0; right: 0; bottom: calc(5vh + env(safe-area-inset-bottom)); text-align: center; color: #4d4943; }

/* ---------- 邀请 ---------- */
.invite { text-align: center; padding: 16vh 12vw 14vh; display: flex; flex-direction: column; align-items: center; }
.inv-h { font-size: 44px; letter-spacing: .5em; text-indent: .5em; color: var(--red); margin-bottom: 4vh; }
.inv-p { font-size: 14px; line-height: 2.3; letter-spacing: .14em; }
.inv-p.small { font-size: 12.5px; color: var(--mute); }
.inv-p b { font-size: 20px; font-weight: var(--cn-d-w); margin: 0 .15em; }
.inv-date { font-size: 21px; letter-spacing: .08em; line-height: 1.8; white-space: nowrap; }
.inv-time { margin-top: 4vh; width: 100%; max-width: 280px; display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid rgba(31,28,25,.18); border-bottom: 1px solid rgba(31,28,25,.18); }
.inv-time div { padding: 14px 0; display: flex; flex-direction: column; gap: 6px; }
.inv-time div + div { border-left: 1px solid rgba(31,28,25,.18); }
.inv-time .label { color: var(--mute); }
.inv-time b { font-family: var(--en-d), serif; font-weight: 400; font-size: 22px; }
.inv-time b.tbd { font-family: var(--cn-b), serif; font-size: 15px; letter-spacing: .3em; color: var(--mute); }
.inv-venue { margin-top: 5vh; }
.vn { font-size: 34px; letter-spacing: .2em; }
.va { margin-top: 6px; font-size: 12px; letter-spacing: .08em; color: var(--mute); }
.nav-btn { display: inline-block; margin-top: 3vh; padding: 12px 34px; border: 1px solid var(--red); color: var(--red); font-size: 13px; letter-spacing: .4em; text-indent: .4em; text-decoration: none; transition: background .3s, color .3s; }
.nav-btn:active, .nav-btn:hover { background: var(--red); color: #f6ecdc; }
.inv-cd { margin-top: 5vh; font-size: 12.5px; letter-spacing: .2em; color: var(--mute); }
.inv-cd b { font-size: 22px; color: var(--ink); margin: 0 2px; letter-spacing: 0; }

/* ---------- 结尾 ---------- */
.end { display: flex; flex-direction: column; align-items: center; text-align: center; padding-top: 0; }
.end-thread { position: relative !important; inset: auto; width: 200px; height: 214px; z-index: 1; }
.seal {
  writing-mode: vertical-rl; width: 92px; height: 92px; padding: 6px;
  display: flex; align-items: center; justify-content: center; flex-wrap: wrap;
  background: var(--red); color: #f6ebd9; font-size: 34px; line-height: 1.12; letter-spacing: 0;
  border-radius: 3px; box-shadow: inset 0 0 0 3px #f1e9da, inset 0 0 0 5px var(--red);
}
.end-cn { margin-top: 5vh; font-size: 30px; letter-spacing: .5em; text-indent: .5em; }
.end-en { margin-top: 12px; font-style: italic; font-size: 15px; color: var(--mute); }
.replay { margin-top: 7vh; color: var(--mute); padding: 10px 16px; }

/* ---------- 浮层控件 ---------- */
#music { position: fixed; top: calc(14px + env(safe-area-inset-top)); right: 14px; z-index: 50; width: 36px; height: 36px; display: none; align-items: flex-end; justify-content: center; gap: 3px; padding: 11px 9px; border-radius: 50%; background: rgba(38,37,35,.35); backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px); }
body.started #music { display: flex; }
#music i { width: 2px; height: 30%; background: #f2ece2; border-radius: 1px; }
#music.playing i { animation: eq 1s ease-in-out infinite; }
#music.playing i:nth-child(2) { animation-delay: .25s; }
#music.playing i:nth-child(3) { animation-delay: .5s; }
@keyframes eq { 0%, 100% { height: 30%; } 50% { height: 100%; } }

#fontlab { position: fixed; left: 50%; bottom: calc(14px + env(safe-area-inset-bottom)); transform: translateX(-50%); z-index: 70; display: flex; align-items: center; gap: 4px; padding: 5px 6px 5px 12px; border-radius: 99px; background: rgba(20,19,18,.82); color: #eee; backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); white-space: nowrap; }
#fontlab[hidden] { display: none; }
#fontlab .label { font-size: 9px; margin-right: 4px; }
#fontlab button { font-family: var(--label), Arial, sans-serif; font-size: 11px; padding: 6px 9px; border-radius: 99px; color: #bbb; }
#fontlab button.on { background: #f2ece2; color: #1a1a1a; }

@media (prefers-reduced-motion: reduce) {
  .grain, #dot .halo { animation: none; }
  .rv, .rv-in { transition-duration: .01s; }
}