:root {
  --paper: #efe9e0;
  --card: rgba(247, 243, 236, 0.96);
  --ink: #1d1b18;
  --soft: #5b564f;
  --faint: rgba(29, 27, 24, 0.22);
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-padding-top: env(safe-area-inset-top, 0px); }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.6 var(--sans);
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
  -webkit-font-smoothing: antialiased;
}
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
a { color: inherit; text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }

#flow { position: fixed; inset: 0; width: 100%; height: 100%; z-index: 0; pointer-events: none; }

.page {
  position: relative; z-index: 1;
  width: min(820px, 100% - 2rem);
  margin: 0 auto 0 max(1rem, 7vw);
  padding: clamp(2rem, 7vh, 4rem) 0 4rem;
}

/* ---------- shared motion ---------- */
@keyframes rise { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }
@keyframes pop { 0% { transform: scale(0.8); } 55% { transform: scale(1.1); } 100% { transform: scale(1); } }
@keyframes shimmer { from { background-position: 200% 0; } to { background-position: -200% 0; } }
@keyframes ripple { from { transform: scale(0.8); opacity: 0.7; } to { transform: scale(2.2); opacity: 0; } }
@keyframes pulse { 50% { transform: scale(0.8); } }
@keyframes flipin { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: none; } }
@keyframes draw { from { transform: scaleX(0); } to { transform: scaleX(1); } }
@keyframes leave { to { opacity: 0; transform: translateY(-12px); } }
@keyframes starin { from { opacity: 0; transform: scale(0.2) rotate(-40deg); } to { opacity: 1; transform: none; } }

/* intro: one staggered entrance */
.brand, h1, .lede, .panel { animation: rise 0.9s var(--ease) backwards; }
.brand { animation-delay: 0.05s; }
h1 { animation-delay: 0.2s; }
.lede { animation-delay: 0.35s; }
.panel { animation-delay: 0.5s; }

/* ---------- hero ---------- */
.brand { font: 600 1.05rem/1 var(--serif); margin: 0 0 1.4rem; display: inline-block; padding: 0.5rem 1rem; border: 1px solid var(--ink); border-radius: 999px; background: var(--paper); }
h1 { font: 500 clamp(2.2rem, 6vw, 3.8rem)/1.05 var(--serif); letter-spacing: -0.015em; margin: 0 0 1rem; max-width: 14em; text-wrap: balance; }
.lede { font-size: 1.1rem; color: var(--soft); max-width: 32em; margin: 0 0 2.2rem; }
h1, .lede { background: radial-gradient(closest-side, var(--paper) 60%, transparent); }

/* ---------- cards ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--ink);
  border-radius: 28px;
  padding: clamp(1.2rem, 3vw, 1.8rem);
  backdrop-filter: blur(3px);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}
.card:hover { transform: translateY(-3px); box-shadow: 0 10px 0 -6px var(--ink); }
.panel:hover { transform: none; box-shadow: none; }

.field-label { font: 600 1.05rem/1.3 var(--serif); display: block; margin: 0 0 0.6rem; padding: 0; }
fieldset { border: 0; margin: 1.5rem 0 0; padding: 0; min-width: 0; }

.subject-row { display: flex; gap: 0.6rem; flex-wrap: wrap; }
input[type="text"] {
  flex: 1 1 240px; min-width: 0; font: inherit; color: inherit;
  padding: 0.8rem 1.2rem; background: var(--paper);
  border: 1px solid var(--ink); border-radius: 999px;
  transition: box-shadow 0.25s;
}
input[type="text"]:focus { outline: none; box-shadow: 0 0 0 3px var(--paper), 0 0 0 4px var(--ink), 0 0 0 7px var(--paper), 0 0 0 8px var(--ink); }
input[type="text"]::placeholder { color: #8a837a; }

.go {
  font: 600 1rem var(--sans); cursor: pointer; display: inline-flex; align-items: center; gap: 0.6rem;
  padding: 0.8rem 1.6rem; border-radius: 999px; border: 1px solid var(--ink);
  color: var(--paper); background-color: var(--ink);
  background-image: linear-gradient(var(--paper), var(--paper)); background-repeat: no-repeat; background-size: 0% 100%;
  transition: background-size 0.4s var(--ease), color 0.4s var(--ease), transform 0.15s;
}
.go:hover:not(:disabled) { background-size: 100% 100%; color: var(--ink); }
.go:active:not(:disabled) { transform: scale(0.96); }
.go:disabled { cursor: progress; }

.examples { display: flex; flex-wrap: wrap; gap: 0.45rem; margin-top: 0.8rem; }
.ex { font: 0.9rem var(--sans); color: var(--soft); background: transparent; border: 1px dashed var(--faint); border-radius: 999px; padding: 0.3rem 0.8rem; cursor: pointer; transition: transform 0.25s var(--ease), border-color 0.2s, color 0.2s; }
.ex:hover { color: var(--ink); border-color: var(--ink); transform: translateY(-3px) rotate(-1.5deg); }

.chip-row { display: flex; flex-wrap: wrap; gap: 0.55rem; }
.chip { position: relative; cursor: pointer; }
.chip input { position: absolute; opacity: 0; inset: 0; cursor: pointer; }
.chip span { display: inline-block; padding: 0.5rem 1.1rem; border: 1px solid var(--ink); border-radius: 999px; background: var(--paper); transition: background 0.25s, color 0.25s, transform 0.25s var(--ease); }
.chip:hover span { transform: translateY(-2px); }
.chip input:checked + span { background: var(--ink); color: var(--paper); animation: pop 0.4s var(--ease); }
.chip input:focus-visible + span { outline: 2px solid var(--ink); outline-offset: 3px; }
.hint { color: var(--soft); font-size: 0.92rem; margin: 0.7rem 0 0; }

/* ---------- length slider ---------- */
.length { margin-top: 1.5rem; }
.length-head { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; flex-wrap: wrap; }
.length-head .field-label { margin: 0; }
#length-out { font-size: 0.95rem; color: var(--soft); display: inline-block; }
#length-out.bump { animation: flipin 0.3s var(--ease); }
.slider-wrap { display: flex; align-items: center; gap: 0.9rem; margin-top: 0.6rem; }
.end { font-size: 0.9rem; color: var(--soft); white-space: nowrap; }
input[type="range"] { -webkit-appearance: none; appearance: none; flex: 1; height: 34px; background: transparent; cursor: pointer; --pct: 40%; }
input[type="range"]::-webkit-slider-runnable-track {
  height: 14px; border-radius: 999px;
  background:
    repeating-linear-gradient(180deg, var(--ink) 0 1.5px, transparent 1.5px 4.7px) left / var(--pct) 100% no-repeat,
    repeating-linear-gradient(180deg, var(--faint) 0 1px, transparent 1px 4.7px);
}
input[type="range"]::-moz-range-track {
  height: 14px; border-radius: 999px;
  background:
    repeating-linear-gradient(180deg, var(--ink) 0 1.5px, transparent 1.5px 4.7px) left / var(--pct) 100% no-repeat,
    repeating-linear-gradient(180deg, var(--faint) 0 1px, transparent 1px 4.7px);
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 30px; height: 30px; margin-top: -8px; border-radius: 50%;
  background: var(--paper); border: 1px solid var(--ink); transition: transform 0.2s var(--ease);
  box-shadow: inset 0 0 0 5px var(--paper), inset 0 0 0 6px var(--ink), inset 0 0 0 10px var(--paper), inset 0 0 0 11px var(--ink);
}
input[type="range"]::-moz-range-thumb {
  width: 28px; height: 28px; border-radius: 50%; background: var(--paper); border: 1px solid var(--ink);
  box-shadow: inset 0 0 0 5px var(--paper), inset 0 0 0 6px var(--ink), inset 0 0 0 10px var(--paper), inset 0 0 0 11px var(--ink);
}
input[type="range"]:hover::-webkit-slider-thumb, input[type="range"]:active::-webkit-slider-thumb { transform: scale(1.2); }

/* ---------- thinking ---------- */
.thinking { margin-top: 1.4rem; }
.thinking.show { animation: rise 0.5s var(--ease) backwards; }
.thinking .card { padding: 1rem 1.4rem 1.2rem; }
.thinking .card:hover { transform: none; box-shadow: none; }
.thinking summary { cursor: pointer; list-style: none; display: flex; align-items: center; gap: 0.8rem; font: 600 1.05rem var(--serif); }
.thinking summary::-webkit-details-marker { display: none; }
.orb { position: relative; width: 22px; height: 22px; border-radius: 50%; flex: none; box-shadow: inset 0 0 0 3px var(--card), inset 0 0 0 4px var(--ink), inset 0 0 0 7px var(--card), inset 0 0 0 8px var(--ink), inset 0 0 0 11px var(--ink); }
.orb::after { content: ""; position: absolute; inset: 0; border-radius: 50%; border: 1px solid var(--ink); opacity: 0; }
.thinking.busy .orb { animation: pulse 1.4s ease-in-out infinite; }
.thinking.busy .orb::after { animation: ripple 1.4s ease-out infinite; }
.go .orb { width: 18px; height: 18px; box-shadow: inset 0 0 0 3px var(--ink), inset 0 0 0 4px var(--paper), inset 0 0 0 7px var(--ink), inset 0 0 0 8px var(--paper), inset 0 0 0 11px var(--paper); animation: pulse 1.2s ease-in-out infinite; }
.steps { list-style: none; margin: 1rem 0 0; padding: 0 0 0 1.6rem; position: relative; }
.steps::before { content: ""; position: absolute; left: 4px; top: 6px; bottom: 6px; width: 7px; background: repeating-linear-gradient(90deg, var(--ink) 0 1px, transparent 1px 3px); opacity: 0.55; }
.steps li { position: relative; margin: 0 0 0.9rem; animation: rise 0.45s var(--ease) backwards; }
.steps li::before { content: ""; position: absolute; left: -1.62rem; top: 0.55em; width: 11px; height: 11px; border-radius: 50%; background: var(--paper); border: 1px solid var(--ink); }
.steps li:last-child::before { animation: pop 0.5s var(--ease); background: var(--ink); }
.steps .s-main { font-weight: 600; }
.steps .s-detail { color: var(--soft); font-size: 0.94rem; display: block; }

.error { margin-top: 1.2rem; }
.error:not([hidden]) { animation: rise 0.4s var(--ease); }

/* ---------- results ---------- */
.result { margin-top: 1.6rem; display: grid; gap: 1.2rem; }
.result.leaving { animation: leave 0.3s ease-in forwards; }
.result > .card:not(.in) { opacity: 0; transform: translateY(26px); }
.result > .card.in { animation: rise 0.75s var(--ease) backwards; }
.result > .card:not(.in) .rv { opacity: 0; }
.result > .card.in .rv { animation: rise 0.6s var(--ease) backwards; animation-delay: calc(var(--i, 0) * 70ms + 120ms); }

.card h2 { font: 500 clamp(1.8rem, 4.4vw, 2.5rem)/1.1 var(--serif); margin: 0 0 0.3rem; letter-spacing: -0.01em; }
.card h3 { font: 500 1.55rem/1.2 var(--serif); margin: 0 0 1rem; position: relative; padding-bottom: 0.6rem; }
.card h3::after { content: ""; position: absolute; left: 0; bottom: 0; width: 56px; height: 5px; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); transform-origin: left; }
.card.in h3::after { animation: draw 0.8s var(--ease) 0.2s backwards; }
.card h4 { font: 600 1.1rem/1.3 var(--serif); margin: 1.4rem 0 0.5rem; }
.desc { color: var(--soft); margin: 0 0 1rem; }

.prose p { font: 1.08rem/1.75 var(--serif); margin: 0 0 1rem; max-width: 40em; }
.prose p:last-child { margin-bottom: 0; }
.short-text { font: 1.2rem/1.7 var(--serif); max-width: 36em; margin: 0; }

.bullets { margin: 0; padding: 0; list-style: none; display: grid; gap: 0.7rem; max-width: 42em; }
.bullets li { position: relative; padding-left: 1.6rem; }
.bullets li::before { content: ""; position: absolute; left: 0; top: 0.62em; width: 11px; height: 11px; border-radius: 50%; box-shadow: inset 0 0 0 1px var(--ink), inset 0 0 0 3px var(--card), inset 0 0 0 4px var(--ink); }

/* pictures */
figure.pic { margin: 0 0 1.2rem; border-radius: 20px; overflow: hidden; border: 1px solid var(--ink); min-height: 160px; background: linear-gradient(100deg, transparent 30%, rgba(29,27,24,0.08) 50%, transparent 70%) 200% 0 / 200% 100%; animation: shimmer 1.6s linear infinite; }
figure.pic.loaded { min-height: 0; background: none; animation: none; }
figure.pic img { display: block; width: 100%; max-height: 320px; object-fit: cover; opacity: 0; transform: scale(1.06); transition: opacity 0.8s var(--ease), transform 1.4s var(--ease); }
figure.pic.loaded img { opacity: 1; transform: none; }
figure.pic figcaption { font-size: 0.8rem; color: var(--soft); padding: 0.4rem 0.9rem; border-top: 1px solid var(--faint); background: var(--card); }
figure.pic.lead { margin: calc(-1 * clamp(1.2rem, 3vw, 1.8rem)) calc(-1 * clamp(1.2rem, 3vw, 1.8rem)) 1.2rem; border: 0; border-bottom: 1px solid var(--ink); border-radius: 0; }
figure.pic.lead img { max-height: 380px; }
.sec-pic { margin: 0.8rem 0 0; }

/* what people say */
.opinions { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.9rem; max-width: 42em; }
.opinions li { display: flex; gap: 0.8rem; align-items: baseline; }
.tag { flex: none; font-size: 0.78rem; padding: 0.05rem 0.6rem; border: 1px solid var(--ink); border-radius: 999px; background: var(--paper); min-width: 5.2rem; text-align: center; }
.tag.positive { background: var(--ink); color: var(--paper); }
.note { color: var(--soft); font-size: 0.9rem; margin: 1rem 0 0; }

.rating-line { color: var(--soft); margin: 0 0 0.9rem; }
.reviews { display: grid; gap: 0.8rem; margin-bottom: 0.5rem; }
.review { display: grid; grid-template-columns: 52px 1fr; gap: 0.9rem; padding: 1rem 1.1rem; border: 1px solid var(--ink); border-radius: 22px; background: var(--paper); transition: transform 0.3s var(--ease); }
.review:hover { transform: translateX(4px); }
.avatar { width: 52px; height: 52px; border-radius: 50%; border: 1px solid var(--ink); object-fit: cover; background: var(--card); display: grid; place-items: center; font: 600 1.3rem var(--serif); }
.card.in .avatar { animation: pop 0.6s var(--ease) 0.3s backwards; }
.who { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.2rem 0.7rem; }
.who b { font: 600 1.05rem var(--serif); }
.who small { color: var(--soft); }
.stars { display: inline-flex; gap: 2px; font-size: 1.05rem; }
.star { color: var(--faint); display: inline-block; }
.star.on { color: var(--ink); }
.card.in .star.on { animation: starin 0.45s var(--ease) backwards; animation-delay: calc(var(--s) * 110ms + 400ms); }
.review h5 { font: 600 1rem var(--serif); margin: 0.4rem 0 0.1rem; }
.review p { margin: 0.2rem 0 0; font-size: 0.97rem; }
.review .more { font-size: 0.82rem; color: var(--soft); }

.source { color: var(--soft); font-size: 0.85rem; margin: 1.1rem 0 0; }
.copy { float: right; font: 0.85rem var(--sans); background: transparent; border: 1px solid var(--ink); border-radius: 999px; padding: 0.25rem 0.9rem; cursor: pointer; transition: background 0.25s, color 0.25s, transform 0.2s; }
.copy:hover { background: var(--ink); color: var(--paper); }
.copy:active { transform: scale(0.92); }

.foot { margin-top: 2.4rem; color: var(--soft); font-size: 0.85rem; max-width: 40em; background: radial-gradient(closest-side, var(--paper) 70%, transparent); animation: rise 0.9s var(--ease) 0.8s backwards; }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .end { display: none; }
  .page { margin-left: auto; margin-right: auto; }
  .review { grid-template-columns: 44px 1fr; }
  .avatar { width: 44px; height: 44px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .result > .card:not(.in), .result > .card:not(.in) .rv { opacity: 1; transform: none; }
  figure.pic img { opacity: 1; transform: none; }
}