/* The landing page. Same tokens as the app (src/styles/global.css): ink on
   paper by default, the original ink, ivory and ember when the system asks
   for dark. Mobile first; wider layouts from 760px. */
@font-face { font-family: "New Computer Modern"; src: url(/site/fonts/NewCM10-Regular.woff2) format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "New Computer Modern"; src: url(/site/fonts/NewCM10-Italic.woff2) format("woff2"); font-style: italic; font-display: swap; }
@font-face { font-family: "JetBrains Mono"; src: url(/site/fonts/JetBrainsMono-400.woff2) format("woff2"); font-weight: 400; font-display: swap; }

:root {
  color-scheme: light;
  --bg: #fcfbf8; --bg-raised: #ffffff; --bg-sunk: #f5f3ee;
  --rule: #e7e3da; --rule-strong: #cdc6b8;
  --fg: #1b1915; --fg-soft: #3b372f; --muted: #736c5e; --faint: #a8a193;
  --gold: #96701f; --ember: #b5361f; --vermilion: #c4501c;
  --ascii-ink: #1b1915; --ascii-gold: #96701f; --ascii-ember: #b5361f; --ascii-alpha: 0.5;
  --serif: "New Computer Modern", "Latin Modern Roman", "Times New Roman", serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #0b0a09; --bg-raised: #12100e; --bg-sunk: #080706;
    --rule: #2b2620; --rule-strong: #463e33;
    --fg: #e8e0cf; --fg-soft: #c9c0ad; --muted: #8c8372; --faint: #5b5448;
    --gold: #d2a95b; --ember: #c4432f; --vermilion: #e0663a;
    --ascii-ink: #e8e0cf; --ascii-gold: #d2a95b; --ascii-ember: #c4432f; --ascii-alpha: 0.55;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0; background: var(--bg); color: var(--fg-soft);
  font: 18px/1.6 var(--serif); -webkit-font-smoothing: antialiased;
}
a { color: var(--gold); }
:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; }
h1, h2, h3 { color: var(--fg); font-weight: 400; }
h2 { font-size: 28px; line-height: 1.2; margin: 0 0 18px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }

.top { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 14px 16px; max-width: 1080px; margin: 0 auto; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--fg); text-decoration: none; font-size: 21px; }
.brand svg { flex: none; }
.top nav { display: flex; gap: 16px; font: 12px var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.top nav a { color: var(--muted); text-decoration: none; }
.top nav a:hover { color: var(--fg); }
@media (max-width: 560px) { .top nav a:not(.login) { display: none; } }

main > section { max-width: 1080px; margin: 0 auto; padding: 56px 16px; border-top: 1px solid var(--rule); }
main > section.hero { border-top: 0; }

.hero { position: relative; min-height: min(86vh, 760px); display: flex; align-items: center; overflow: hidden; }
.field { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.hero-inner { position: relative; max-width: 640px; }
.hero h1 { font-size: 38px; line-height: 1.12; margin: 0 0 16px; }
.kicker { font: 12px var(--mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--ember); margin: 0 0 12px; }
.lead { font-size: 20px; color: var(--fg-soft); margin: 0 0 28px; }
/* text stays legible over the sphere */
.hero-inner > * { text-shadow: 0 0 12px var(--bg), 0 0 4px var(--bg); }
@media (min-width: 760px) {
  .hero h1 { font-size: 54px; }
  .lead { font-size: 22px; }
}

.cta { display: grid; gap: 10px; justify-items: start; text-shadow: none; }
.cta-go {
  display: inline-block; padding: 14px 26px; font: 14px var(--mono); letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--bg); background: var(--fg); border: 1px solid var(--fg); text-decoration: none;
}
.cta-go:hover { background: var(--gold); border-color: var(--gold); }
.cta .note { font-size: 14px; color: var(--muted); margin: 0; }

.steps { list-style: none; padding: 0; margin: 0; display: grid; gap: 28px; counter-reset: step; }
.steps li { counter-increment: step; }
.steps li::before { content: counter(step, upper-roman) "."; display: block; font: 13px var(--mono); color: var(--gold); letter-spacing: 0.1em; margin-bottom: 6px; }
.steps h3 { font-size: 22px; margin: 0 0 6px; font-style: italic; }
.steps p { margin: 0; }
@media (min-width: 760px) { .steps { grid-template-columns: repeat(3, 1fr); gap: 36px; } }

.points { list-style: none; padding: 0; margin: 0; display: grid; gap: 24px; }
.points li { padding-left: 16px; border-left: 2px solid var(--gold); }
.points h3 { font-size: 20px; margin: 0 0 4px; font-style: italic; }
.points p { margin: 0; }
@media (min-width: 760px) { .points { grid-template-columns: repeat(3, 1fr); gap: 32px; } }

.section-lead { margin: -6px 0 24px; max-width: 640px; }
.figure-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 28px; }
.figure-grid figure { margin: 0; border: 1px solid var(--rule); background: var(--bg-raised); }
.figure-grid .frame { overflow-x: auto; -webkit-overflow-scrolling: touch; }
/* figures are drawn for the book's ~760px column: on a phone, scroll sideways rather than squash */
.figure-grid iframe { display: block; width: 100%; min-width: 680px; height: 420px; border: 0; background: transparent; }
.figure-grid figcaption { padding: 10px 14px; border-top: 1px solid var(--rule); font-size: 15px; }
.figure-grid figcaption b { display: block; font: 11px var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--gold); font-weight: 400; }

.topic-list { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 10px; }
.topic-list li { padding: 6px 12px; border: 1px solid var(--rule-strong); font-style: italic; }

.plans { display: grid; gap: 16px; }
@media (min-width: 760px) { .plans { grid-template-columns: 1fr 1.15fr 1fr; align-items: stretch; } }
.plan { padding: 22px; border: 1px solid var(--rule); background: var(--bg-raised); }
.plan.headline { border-color: var(--gold); }
.plan h3 { margin: 0; font: 12px var(--mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); }
.plan.headline h3 { color: var(--gold); }
.plan .price { font-size: 40px; color: var(--fg); margin: 6px 0 4px; line-height: 1.1; }
.plan .price small { font-size: 16px; color: var(--muted); }
.plan p { margin: 0; }
.fine { font-size: 14px; color: var(--muted); margin: 16px 0 0; }

.faq details { border-bottom: 1px solid var(--rule); padding: 14px 0; max-width: 760px; }
.faq summary { cursor: pointer; color: var(--fg); font-size: 20px; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: "+"; display: inline-block; width: 1.2em; font-family: var(--mono); color: var(--gold); }
.faq details[open] summary::before { content: "−"; }
.faq details p { margin: 8px 0 0 1.2em; }

.closing h2 { font-size: 34px; }
.hero-links { display: flex; flex-wrap: wrap; gap: 8px 22px; margin: 18px 0 0; font: 13px var(--mono); letter-spacing: 0.04em; }
.hero-links a { text-decoration: none; }
.hero-links a:hover { text-decoration: underline; }
.more { margin: 28px 0 0; font: 14px var(--mono); }
.more a { text-decoration: none; }

.foot { max-width: 1080px; margin: 0 auto; padding: 24px 16px 40px; border-top: 1px solid var(--rule); display: flex; flex-wrap: wrap; gap: 6px 18px; font-size: 14px; }
.foot, .foot a { color: var(--muted); text-decoration: none; }
.foot a:hover { color: var(--fg); }

/* ===== Teach mode (invite only): a class on a stage, in four steps ======== */
.teach .kicker { margin-bottom: 8px; }
.td { display: grid; gap: 22px; margin-top: 8px; }
@media (min-width: 860px) { .td { grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 36px; align-items: center; } }

.td-stage {
  position: relative; aspect-ratio: 16 / 10; overflow: hidden;
  border: 1px solid var(--rule-strong); background: var(--bg-raised);
  font: 12px var(--mono); color: var(--muted);
}
.td-bar { position: absolute; inset: 0 0 auto; display: flex; gap: 12px; align-items: center; padding: 10px 14px; border-bottom: 1px solid var(--rule); background: var(--bg-raised); z-index: 3; }
.td-title { flex: 1; color: var(--fg); font-family: var(--serif); font-size: 15px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.td-live { color: var(--ember); letter-spacing: 0.1em; text-transform: uppercase; animation: td-pulse 1.6s ease-in-out infinite; }
.td-count { white-space: nowrap; }
@keyframes td-pulse { 50% { opacity: 0.35; } }

/* every layer sits on the stage; the step shows its own */
.td-plan, .td-board, .td-voice, .td-ask, .td-offer, .td-book { position: absolute; transition: opacity 0.6s, transform 0.7s cubic-bezier(0.16, 1, 0.3, 1); }
.td-plan { inset: 64px 22px auto; margin: 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.td-plan li { display: flex; align-items: center; gap: 12px; padding: 10px 12px; border: 1px solid var(--rule); background: var(--bg); font: 15px var(--serif); color: var(--fg); opacity: 0; transform: translateX(-16px); transition: opacity 0.5s, transform 0.6s cubic-bezier(0.16, 1, 0.3, 1); }
.td-plan b { font: 12px var(--mono); color: var(--gold); font-weight: 400; }
.td-chip { margin-left: auto; padding: 2px 8px; border: 1px solid var(--gold); color: var(--gold); font: 10.5px var(--mono); letter-spacing: 0.06em; text-transform: uppercase; }
.td[data-step="0"] .td-plan li { opacity: 1; transform: none; }
.td[data-step="0"] .td-plan li:nth-child(2) { transition-delay: 0.35s; }
.td[data-step="0"] .td-plan li:nth-child(3) { transition-delay: 0.7s; }

.td-board { inset: 52px 4% 64px; width: 92%; height: auto; opacity: 0; }
.td-board .td-grid rect, .td-book-fig .td-grid rect { fill: color-mix(in srgb, var(--gold) 10%, transparent); stroke: var(--gold); stroke-width: 1.2; }
.td-board text { font: 15px var(--serif); fill: var(--fg); }
.td-board .td-note { font: italic 15px var(--serif); fill: var(--ember); opacity: 0; transition: opacity 0.6s 2.4s; }
.td-ink, .td-ink-still { fill: none; stroke: var(--ember); stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.td-ink { stroke-dasharray: 1; stroke-dashoffset: 1; }
.td-voice { left: 22px; bottom: 18px; display: flex; gap: 4px; align-items: center; height: 26px; opacity: 0; }
.td-voice i { display: block; width: 4px; height: 100%; background: var(--gold); transform-origin: 50% 50%; animation: td-voice 0.9s ease-in-out infinite; }
.td-voice i:nth-child(2n) { animation-delay: -0.3s; } .td-voice i:nth-child(3n) { animation-delay: -0.6s; } .td-voice i:nth-child(5) { animation-delay: -0.15s; }
@keyframes td-voice { 0%, 100% { transform: scaleY(0.25); } 50% { transform: scaleY(1); } }
.td[data-step="1"] .td-board, .td[data-step="2"] .td-board { opacity: 1; }
.td[data-step="1"] .td-voice, .td[data-step="2"] .td-voice { opacity: 1; }
.td[data-step="1"] .td-ink { animation: td-draw 1.2s 0.4s ease-out forwards; }
.td[data-step="1"] .td-ink-2 { animation-delay: 1.4s; }
.td[data-step="1"] .td-ink-3 { animation-delay: 2s; }
.td[data-step="1"] .td-note, .td[data-step="2"] .td-note { opacity: 1; }
.td[data-step="2"] .td-ink { stroke-dashoffset: 0; }
.td[data-step="2"] .td-board { opacity: 0.45; }
@keyframes td-draw { to { stroke-dashoffset: 0; } }

.td-ask { right: 16px; bottom: 74px; margin: 0; padding: 8px 12px; max-width: 70%; border: 1px solid var(--rule-strong); background: var(--bg); font-size: 12px; opacity: 0; transform: translateY(10px); }
.td-ask em { font: italic 15px var(--serif); color: var(--fg); }
.td-offer {
  left: 50%; top: 50%; width: min(86%, 380px); display: grid; gap: 10px; padding: 14px 16px;
  border: 1px solid var(--gold); background: var(--bg-raised); color: var(--fg); font: 15px/1.4 var(--serif);
  box-shadow: 0 10px 30px color-mix(in srgb, var(--fg) 12%, transparent);
  opacity: 0; transform: translate(-50%, -30%) scale(0.96);
}
.td-offer b { font-weight: 400; font-style: italic; color: var(--gold); }
.td-offer-btns { display: flex; gap: 10px; font: 11px var(--mono); letter-spacing: 0.1em; text-transform: uppercase; }
.td-yes { padding: 6px 12px; background: var(--fg); color: var(--bg); }
.td-no { padding: 6px 12px; border: 1px solid var(--rule-strong); color: var(--muted); }
.td[data-step="2"] .td-ask { opacity: 1; transform: none; transition-delay: 0.2s; }
.td[data-step="2"] .td-offer { opacity: 1; transform: translate(-50%, -50%); transition-delay: 1.1s; }
.td[data-step="2"] .td-yes { animation: td-press 0.4s 3s both; }
@keyframes td-press { 50% { transform: scale(0.94); background: var(--gold); } }

.td-book { inset: 44px 0 0; padding: 22px 26px; background: var(--bg); opacity: 0; transform: translateY(24px); display: flex; flex-direction: column; gap: 8px; }
.td-book-kicker { margin: 0; font: 11px var(--mono); letter-spacing: 0.2em; text-transform: uppercase; color: var(--gold); }
.td-book-title { margin: 0 0 4px; font: 26px/1.1 var(--serif); font-variant-caps: small-caps; color: var(--fg); }
.td-line { display: block; height: 6px; background: var(--rule); transform-origin: 0 50%; transform: scaleX(0); transition: transform 0.7s cubic-bezier(0.16, 1, 0.3, 1); }
.td-short { width: 60%; }
.td-book-fig { border: 1px solid var(--rule); background: var(--bg-raised); opacity: 0; transition: opacity 0.6s 1.2s; }
.td-book-fig svg { display: block; width: 100%; height: auto; max-height: 90px; }
.td-book-tags { display: flex; flex-wrap: wrap; gap: 8px; margin: auto 0 0; }
.td-book-tags span { padding: 3px 9px; border: 1px solid var(--gold); color: var(--gold); font-size: 10.5px; letter-spacing: 0.06em; text-transform: uppercase; opacity: 0; transform: translateY(6px); transition: opacity 0.4s, transform 0.5s; }
.td[data-step="3"] .td-book { opacity: 1; transform: none; }
.td[data-step="3"] .td-line { transform: scaleX(1); }
.td[data-step="3"] .td-line:nth-of-type(2) { transition-delay: 0.25s; }
.td[data-step="3"] .td-line:nth-of-type(3) { transition-delay: 0.5s; }
.td[data-step="3"] .td-book-fig { opacity: 1; }
.td[data-step="3"] .td-book-tags span { opacity: 1; transform: none; transition-delay: 1.8s; }
.td[data-step="3"] .td-book-tags span:nth-child(2) { transition-delay: 2s; }
.td[data-step="3"] .td-book-tags span:nth-child(3) { transition-delay: 2.2s; }
@media (max-width: 520px) { .td-book-fig { display: none; } .td-title { font-size: 13px; } }

/* the four steps beside it: the one playing is marked, any can be picked */
.td-steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; }
.td-steps button {
  display: grid; grid-template-columns: 30px 1fr; gap: 10px; width: 100%; padding: 12px 14px 12px 12px; text-align: left; cursor: pointer;
  border: 0; border-left: 2px solid var(--rule); background: none; color: var(--muted); font: 16px/1.45 var(--serif);
  transition: border-color 0.3s, color 0.3s, background 0.3s;
}
.td-steps b { display: block; font-weight: 400; font-style: italic; font-size: 20px; color: var(--fg); margin-bottom: 2px; }
.td-n { font: 12px var(--mono); color: var(--faint); padding-top: 6px; }
.td-steps button.is-on { border-left-color: var(--gold); color: var(--fg-soft); background: color-mix(in srgb, var(--gold) 5%, transparent); }
.td-steps button.is-on .td-n { color: var(--gold); }
.td-steps button:not(.is-on) b { color: var(--muted); }
@media (max-width: 859px) { .td-steps button:not(.is-on) span:last-child { font-size: 0; } .td-steps button:not(.is-on) b { font-size: 17px; margin: 0; } }

@media (prefers-reduced-motion: reduce) {
  .td *, .td *::before { animation: none !important; transition: none !important; }
  .td[data-step="1"] .td-ink { stroke-dashoffset: 0; }
}

/* ----- the request form ----- */
.tf { margin-top: 48px; padding: 28px 22px; border: 1px solid var(--rule-strong); background: var(--bg-raised); display: grid; gap: 22px; }
@media (min-width: 860px) { .tf { grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr); gap: 40px; padding: 34px; } }
.tf-intro h3 { margin: 0 0 8px; font-size: 26px; font-style: italic; }
.tf-intro p { margin: 0; }
.tf-form { display: grid; gap: 14px; }
@media (min-width: 620px) { .tf-form { grid-template-columns: 1fr 1fr; } .tf-wide, .tf-foot { grid-column: 1 / -1; } }
.tf-form label { display: grid; gap: 6px; }
.tf-form label > span { font: 11px var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
.tf-form small { text-transform: none; letter-spacing: 0; }
.tf-form input, .tf-form select, .tf-form textarea {
  width: 100%; padding: 10px 12px; border: 1px solid var(--rule-strong); border-radius: 0; background: var(--bg); color: var(--fg); font: 16px var(--serif);
}
.tf-form textarea { resize: vertical; }
.tf-form input:focus, .tf-form select:focus, .tf-form textarea:focus { outline: none; border-color: var(--gold); }
.tf-trap { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.tf-foot { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 18px; }
.tf-foot .cta-go { cursor: pointer; }
.tf-foot .cta-go:disabled { opacity: 0.5; cursor: default; }
.tf-status { margin: 0; font-size: 16px; }
.tf-status.is-error { color: var(--ember); }
.tf.is-sent .tf-form { display: none; }
.tf-done { margin: 0; font-size: 20px; color: var(--fg); }