:root {
  --wood-0: #120905;
  --wood-1: #1d1109;
  --wood-2: #2b1a0f;
  --wood-3: #3a2415;
  --vermilion: #b8281c;
  --vermilion-hi: #d94632;
  --vermilion-lo: #6e130d;
  --gold: #c9a24b;
  --gold-hi: #ecd08a;
  --gold-lo: #8a6a23;
  --paper: #f0e2bd;
  --paper-2: #e6d4a6;
  --ink: #2a1a10;
  --text: #ead9b0;
  --muted: #b39f78;
  --kai: "Kaiti SC", "STKaiti", "KaiTi", "BiauKai", "DFKai-SB", "Noto Serif CJK SC", "Noto Serif SC", "Songti SC", "SimSun", serif;
  --serif: "Songti SC", "Noto Serif CJK SC", "Noto Serif SC", "SimSun", "PMingLiU", serif;
}
* { box-sizing: border-box; }
html { color-scheme: dark; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.8;
  color: var(--text);
  background-color: var(--wood-1);
  background-image:
    radial-gradient(ellipse at 50% 0%, rgba(184, 40, 28, .22), transparent 55%),
    radial-gradient(ellipse at 50% 100%, rgba(0, 0, 0, .55), transparent 60%),
    repeating-linear-gradient(90deg, rgba(0, 0, 0, .28) 0 2px, transparent 2px 46px, rgba(255, 220, 160, .035) 46px 47px, transparent 47px 92px),
    repeating-linear-gradient(90deg, var(--wood-2) 0 23px, var(--wood-1) 23px 52px, var(--wood-3) 52px 71px, var(--wood-1) 71px 112px);
  background-attachment: fixed;
}
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
a { color: var(--gold-hi); }
code { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: .82em; color: var(--gold-hi); word-break: break-all; }
:focus-visible { outline: 3px solid var(--gold-hi); outline-offset: 3px; }

.demo-ribbon {
  position: sticky; top: 0; z-index: 10; text-align: center; font-size: 14px; padding: 6px 16px;
  background: var(--vermilion-lo); color: #ffe7bd; border-bottom: 1px solid var(--gold-lo); letter-spacing: .04em;
}
.masthead { text-align: center; padding: 36px 16px 8px; position: relative; }
.masthead h1 {
  margin: 8px 0 0; font-family: var(--kai); font-weight: 400; font-size: clamp(40px, 9vw, 68px); letter-spacing: .3em; padding-left: .3em;
  background: linear-gradient(180deg, var(--gold-hi), var(--gold) 55%, var(--gold-lo)); -webkit-background-clip: text; background-clip: text; color: transparent;
  text-shadow: 0 0 24px rgba(201, 162, 75, .25);
}
.tagline { margin: 4px 0 14px; color: var(--muted); letter-spacing: .5em; padding-left: .5em; font-family: var(--kai); }
.seal {
  display: inline-grid; place-items: center; width: 46px; height: 46px; font-family: var(--kai); font-size: 28px; line-height: 1;
  color: #ffe9c4; background: var(--vermilion); border: 2px solid #ffcf9a33; border-radius: 4px; transform: rotate(-4deg);
  box-shadow: inset 0 0 0 2px var(--vermilion-lo), 0 2px 10px rgba(0, 0, 0, .5);
}
.script-toggle { display: inline-flex; border: 1px solid var(--gold-lo); border-radius: 999px; overflow: hidden; }
.script-toggle button { font: inherit; font-size: 14px; background: transparent; color: var(--muted); border: 0; padding: 4px 16px; cursor: pointer; }
.script-toggle button[aria-pressed="true"] { background: var(--gold-lo); color: #fff4d8; }

main { max-width: 760px; margin: 0 auto; padding: 0 16px 40px; }
section { margin: 28px 0; }
h2 { font-family: var(--kai); font-weight: 400; font-size: 26px; letter-spacing: .2em; color: var(--gold-hi); margin: 0 0 8px; }
h2::before { content: "◆ "; color: var(--vermilion-hi); font-size: .6em; vertical-align: .25em; letter-spacing: 0; }

/* altar: incense + cylinder */
.altar { display: grid; grid-template-columns: 1fr minmax(180px, 250px) 1fr; align-items: end; gap: 4px; margin-top: 12px; }
.incense { justify-self: end; width: min(110px, 100%); opacity: .95; }
.incense.right { justify-self: start; }
.incense-svg { width: 100%; height: auto; overflow: visible; }
.incense-svg.flip { transform: scaleX(-1); }
.inc-stick { fill: #7a4b22; }
.ember { fill: #ff7a3a; animation: glow 2.4s ease-in-out infinite; filter: drop-shadow(0 0 4px #ff7a3a); }
.smoke { fill: none; stroke: rgba(236, 220, 190, .55); stroke-width: 3; stroke-linecap: round; stroke-dasharray: 60 240; filter: blur(2px); animation: rise 7s linear infinite; }
.s2 { animation-duration: 9s; animation-delay: -3s; stroke-width: 2.5; }
.s3 { animation-duration: 8s; animation-delay: -5s; }
@keyframes rise { 0% { stroke-dashoffset: 60; opacity: 0; } 15% { opacity: .85; } 100% { stroke-dashoffset: -260; opacity: 0; } }
@keyframes glow { 0%, 100% { opacity: .75; } 50% { opacity: 1; } }

.cylinder-stage { position: relative; }
#cylinder { display: block; width: 100%; height: auto; overflow: visible; filter: drop-shadow(0 18px 18px rgba(0, 0, 0, .6)); }
.tube-glyph { font-family: var(--kai); font-size: 42px; fill: var(--gold-hi); }
.tube, .slat { transform-box: fill-box; }
.tube { transform-origin: 50% 100%; }
.slat { transform-origin: 50% 100%; }
#cylinder.shaking .tube { animation: shake .42s ease-in-out infinite; }
#cylinder.shaking .slat { animation: rattle .21s ease-in-out infinite alternate; }
#cylinder.shaking .sl2, #cylinder.shaking .sl5 { animation-delay: -.1s; animation-duration: .17s; }
#cylinder.shaking .sl3 { animation-duration: .25s; }
@keyframes shake {
  0% { transform: rotate(0) translateX(0); } 15% { transform: rotate(-9deg) translateX(-5px); } 35% { transform: rotate(8deg) translateX(5px); }
  55% { transform: rotate(-7deg) translateX(-4px); } 75% { transform: rotate(6deg) translateX(3px); } 100% { transform: rotate(0) translateX(0); }
}
@keyframes rattle { from { transform: translateY(0) rotate(-2deg); } to { transform: translateY(-14px) rotate(2deg); } }
.chosen { opacity: 0; transform-box: fill-box; transform-origin: 50% 100%; }
.chosen-text { font-family: var(--kai); font-size: 14px; fill: #4a0f08; text-anchor: middle; }
#cylinder.dropping .chosen { opacity: 1; animation: drop 1.9s cubic-bezier(.3, .1, .3, 1) forwards; }
@keyframes drop {
  0% { transform: translate(0, 40px) rotate(0); } 28% { transform: translate(0, -62px) rotate(0); }
  55% { transform: translate(34px, -44px) rotate(18deg); } 80% { transform: translate(86px, 70px) rotate(62deg); }
  100% { transform: translate(110px, 150px) rotate(84deg); opacity: .92; }
}
.tray { height: 8px; margin: -4px 12% 0; border-radius: 50%; background: radial-gradient(ellipse, rgba(0, 0, 0, .55), transparent 70%); }

/* ask */
.ask { background: linear-gradient(180deg, rgba(58, 36, 21, .85), rgba(29, 17, 9, .9)); border: 1px solid var(--gold-lo); border-radius: 6px; padding: 20px 20px 24px; box-shadow: inset 0 0 0 4px rgba(0, 0, 0, .25), 0 10px 30px rgba(0, 0, 0, .45); }
.hint { color: var(--muted); margin: 0 0 14px; font-size: 15px; }
.hint.small { font-size: 13px; margin: 6px 0 0; }
.field { display: grid; gap: 4px; margin-bottom: 14px; }
label { color: var(--gold-hi); font-size: 15px; }
select, input {
  font: inherit; color: var(--text); background: var(--wood-0); border: 1px solid var(--gold-lo); border-radius: 4px; padding: 8px 10px; width: 100%;
}
.commit-box { border: 1px dashed var(--gold-lo); border-radius: 4px; padding: 10px 12px; margin-bottom: 18px; background: rgba(0, 0, 0, .25); }
.commit-title { color: var(--gold-hi); font-family: var(--kai); letter-spacing: .15em; }
.tag { font-family: var(--serif); font-size: 12px; letter-spacing: 0; color: var(--muted); border: 1px solid var(--gold-lo); border-radius: 3px; padding: 0 5px; margin-left: 6px; }
button { font: inherit; cursor: pointer; }
button.primary {
  display: block; width: 100%; font-family: var(--kai); font-size: 26px; letter-spacing: .6em; padding: 12px 0 12px .6em; color: #ffeccb;
  background: linear-gradient(180deg, var(--vermilion-hi), var(--vermilion) 50%, var(--vermilion-lo)); border: 2px solid var(--gold); border-radius: 6px;
  box-shadow: inset 0 1px 0 #ffffff33, 0 6px 16px rgba(0, 0, 0, .5);
}
button.primary.small { display: inline-block; width: auto; font-size: 16px; letter-spacing: .2em; padding: 6px 22px; }
button.primary:disabled { filter: grayscale(.7) brightness(.7); cursor: not-allowed; }
button.primary:not(:disabled):active { transform: translateY(1px); }
button.ghost { background: transparent; color: var(--gold-hi); border: 1px solid var(--gold-lo); border-radius: 4px; padding: 6px 16px; }
button.ghost:hover { background: rgba(201, 162, 75, .12); }
.status { min-height: 1.8em; margin: 10px 0 0; text-align: center; color: var(--muted); font-family: var(--kai); }

/* slip */
.result { animation: fade .8s ease both; }
@keyframes fade { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
.slip {
  position: relative; color: var(--ink); background: radial-gradient(ellipse at 30% 0%, #fbf0d0, var(--paper) 55%, var(--paper-2)); border: 3px double var(--vermilion);
  border-radius: 4px; padding: 26px 22px 20px; box-shadow: 0 0 0 5px rgba(0, 0, 0, .35), 0 18px 40px rgba(0, 0, 0, .6);
}
.slip h3, .slip h4 { font-family: var(--kai); font-weight: 400; margin: 0; }
.slip-head { text-align: center; border-bottom: 1px solid #7a4b2255; padding-bottom: 12px; }
.slip-no { margin: 0; font-family: var(--kai); font-size: clamp(34px, 8vw, 52px); color: var(--vermilion); letter-spacing: .15em; line-height: 1.3; }
.slip-title { font-size: 22px; letter-spacing: .1em; }
.slip-grade { display: inline-block; margin: 8px 0 0; padding: 0 14px; font-family: var(--kai); font-size: 20px; color: #fff0d0; background: var(--vermilion); border-radius: 3px; letter-spacing: .3em; }
.poem { writing-mode: vertical-rl; margin: 18px auto; width: fit-content; max-width: 100%; max-height: 22em; overflow-x: auto; font-family: var(--kai); font-size: clamp(20px, 4.6vw, 26px); line-height: 2.1; letter-spacing: .2em; }
.poem p { margin: 0 0 0 .6em; }
.block { margin-top: 16px; }
.block h4 { font-size: 18px; color: var(--vermilion); border-left: 4px solid var(--vermilion); padding-left: 8px; margin-bottom: 4px; letter-spacing: .15em; }
.block p { margin: 2px 0; }
.block .tag { color: #6b4a2b; border-color: #6b4a2b66; }
.editorial { background: #0000000d; border-radius: 4px; padding: 8px 10px; }
.notice { margin-top: 8px !important; padding: 8px 10px; background: #b8281c1f; border: 1px solid var(--vermilion); border-radius: 4px; font-size: 15px; }
.provenance { margin: 18px 0 0; font-size: 13px; color: #6b4a2b; text-align: right; }
.stamp {
  position: absolute; top: 14px; right: 14px; transform: rotate(10deg); border: 3px solid var(--vermilion); color: var(--vermilion); border-radius: 4px; padding: 2px 8px;
  font-family: var(--kai); font-size: 15px; line-height: 1.25; text-align: center; letter-spacing: .15em; opacity: .85; background: #fff6e033;
}
.verify-card { margin-top: 22px; border: 1px solid var(--gold-lo); border-radius: 6px; padding: 14px 16px; background: rgba(0, 0, 0, .3); }
.verify-card h3 { margin: 0 0 8px; font-family: var(--kai); font-weight: 400; color: var(--gold-hi); letter-spacing: .15em; }
.kv { display: grid; grid-template-columns: max-content 1fr; gap: 4px 14px; margin: 0 0 12px; font-size: 14px; }
.kv dt { color: var(--muted); } .kv dd { margin: 0; min-width: 0; }
.verify-out { margin: 8px 0 0; font-size: 15px; } .verify-out.ok { color: #9fd49a; } .verify-out.bad { color: #ff9a8a; }
#again { margin-top: 16px; }

/* method / about */
.method, .about { border-top: 1px solid var(--gold-lo); padding-top: 18px; }
.steps { padding-left: 1.3em; } .steps li { margin: 8px 0; padding-left: 4px; } .steps li::marker { color: var(--vermilion-hi); font-family: var(--kai); font-size: 1.1em; }
.callout { border-left: 4px solid var(--vermilion); padding: 6px 12px; background: rgba(184, 40, 28, .12); font-size: 15px; }
.verifier { border: 1px solid var(--gold-lo); border-radius: 6px; padding: 8px 14px; }
.verifier summary { cursor: pointer; color: var(--gold-hi); }
.verifier form { display: grid; gap: 10px; margin-top: 10px; }
.row { display: flex; gap: 10px; flex-wrap: wrap; }
.about ul { padding-left: 1.2em; }
.disclaimer { max-width: 760px; margin: 0 auto; padding: 18px 16px 48px; color: var(--muted); font-size: 14px; border-top: 3px double var(--gold-lo); }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .altar { grid-template-columns: 56px 1fr 56px; }
  .incense { width: 56px; }
  .ask { padding: 16px 14px 20px; }
  .kv { grid-template-columns: 1fr; gap: 0; } .kv dd { margin-bottom: 6px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .smoke { opacity: .35; stroke-dashoffset: 0; }
  #cylinder.dropping .chosen { opacity: 1; transform: translate(110px, 150px) rotate(84deg); }
}