/* ============================================================
   Pressfield — electrophoretic e-ink aesthetic
   Paper #F4F1EA · Ink #1A1A1A · grayscale only
   Libre Baskerville (display) · IBM Plex Sans (body) · IBM Plex Mono (meta)
   Type is self-hosted via fonts/fonts.css
   ============================================================ */

/* ---- Tokens ---- */
:root {
  --paper: #F4F1EA;
  --paper-deep: #E8E4DA;
  --ink: #1A1A1A;
  --ink-soft: #4A4A4A;
  --ghost: #9A958C;
  --flash: #2C2C2C;
  --hairline: #C8C3B8;

  --serif: "Libre Baskerville", Georgia, "Times New Roman", serif;
  --sans: "IBM Plex Sans", system-ui, -apple-system, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --measure: 62ch;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --margin-col: clamp(8rem, 16vw, 14rem);

  --flash-ms: 150ms;
  --rise-ms: 300ms;
  --settle-ms: 400ms;
}

/* ---- Reset-ish ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3 { font-family: var(--serif); font-weight: 700; line-height: 1.15; }
.mono { font-family: var(--mono); letter-spacing: 0.02em; }

::selection { background: var(--ink); color: var(--paper); }

/* ---- Focus ---- */
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}
.btn:focus-visible, .faq-trigger:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

/* ---- Grain overlay (static, 4%) ---- */
.grain {
  position: fixed;
  inset: 0;
  z-index: 60;
  pointer-events: none;
  opacity: 0.045;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---- E-ink flash layer ---- */
.flash {
  position: fixed;
  inset: 0;
  z-index: 70;
  pointer-events: none;
  background: var(--flash);
  opacity: 0;
}
.flash.is-flashing { animation: eink-flash var(--flash-ms) steps(2, jump-none) 1; }
@keyframes eink-flash {
  0%   { opacity: 0; }
  50%  { opacity: 0.92; }
  100% { opacity: 0; }
}

/* ---- Skip link ---- */
.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 0.6rem 1rem;
  z-index: 100;
  font-family: var(--mono);
  font-size: 0.85rem;
}
.skip:focus-visible { left: 0; }

/* ---- Buttons ---- */
.btn {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-decoration: none;
  padding: 0.65rem 1.2rem;
  border: 1px solid var(--ink);
  transition: background 160ms ease, color 160ms ease;
}
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--ink-soft); }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { background: var(--paper-deep); }
.btn-lg { padding: 0.8rem 1.6rem; font-size: 0.95rem; }

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--paper);
  border-bottom: 1px solid var(--ink);
}
.nav-inner {
  max-width: 82rem;
  margin: 0 auto;
  padding: 0.9rem var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.wordmark {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.25rem;
  text-decoration: none;
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  white-space: nowrap;
}
.wordmark-mark {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.95rem;
  border: 1px solid var(--ink);
  padding: 0.1rem 0.4rem;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 1.6rem;
}
.nav-links a:not(.btn) {
  font-family: var(--mono);
  font-size: 0.85rem;
  letter-spacing: 0.03em;
  text-decoration: none;
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}
.nav-links a:not(.btn):hover { color: var(--ink); border-bottom-color: var(--ink); }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  max-width: 82rem;
  margin: 0 auto;
  padding: clamp(4rem, 12vh, 8rem) var(--gutter) clamp(3rem, 8vh, 6rem);
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
}
.hero-eyebrow {
  font-size: 0.8rem;
  color: var(--ghost);
  margin-bottom: 1.6rem;
}
.hero-title {
  font-size: clamp(3.2rem, 10vw, 7.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.02;
  display: grid;
}
.hero-line {
  display: block;
  opacity: 0;
  transform: translateY(6px);
  animation: ink-settle var(--settle-ms) ease-out forwards;
}
.hero-line:nth-child(2) { animation-delay: 120ms; }
@keyframes ink-settle { to { opacity: 1; transform: none; } }

.hero-rule {
  width: 6rem;
  border-bottom: 3px solid var(--ink);
  margin: 1.8rem 0 1.4rem;
}
.hero-sub {
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 34rem;
}
.hero-cta-row {
  margin-top: 2rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Device frame */
.device { text-align: left; }
.device-frame {
  border: 2px solid var(--ink);
  background: var(--paper-deep);
  padding: 0.9rem;
  box-shadow: 6px 6px 0 0 var(--hairline);
}
.device-screen {
  background: var(--paper);
  border: 1px solid var(--hairline);
  padding: 1.2rem 1.3rem 1rem;
  display: grid;
  gap: 1.4rem;
  min-height: 16rem;
  align-content: space-between;
}
.device-status, .device-foot {
  font-size: 0.7rem;
  color: var(--ghost);
  text-transform: uppercase;
}
.device-line {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 2.6rem;
  line-height: 1.1;
}
.device-caption {
  margin-top: 0.9rem;
  font-size: 0.78rem;
  color: var(--ghost);
  max-width: 24rem;
}

/* ============================================================
   SECTIONS
   ============================================================ */
.section {
  border-top: 1px solid var(--ink);
  max-width: 82rem;
  margin: 0 auto;
  padding: clamp(3rem, 8vh, 5.5rem) var(--gutter);
}
.section-head {
  display: grid;
  grid-template-columns: var(--margin-col) 1fr;
  gap: 0 1.5rem;
  align-items: baseline;
  max-width: var(--measure);
  margin-left: 0;
  padding-bottom: 2.5rem;
}
.section-index { font-size: 0.8rem; color: var(--ghost); }
.section-head h2 { font-size: clamp(1.8rem, 4vw, 2.6rem); }
.section-lede {
  grid-column: 2;
  color: var(--ink-soft);
  max-width: 48ch;
  margin-top: 0.6rem;
}

/* ---- Why paper: prose + margin notes ---- */
.prose-with-notes {
  position: relative;
  max-width: var(--measure);
}
.prose-col p {
  font-size: 1.05rem;
  color: var(--ink);
  max-width: 58ch;
  margin-bottom: 1.4rem;
}
.prose-col em { font-style: italic; }
.prose-col p:first-child { border-left: 3px solid var(--hairline); padding-left: 1.2rem; }

.margin-note {
  position: absolute;
  left: calc(100% + 2.5rem);
  width: calc(var(--margin-col) - 2rem);
  max-width: 12rem;
  border-top: 1px solid var(--hairline);
  padding-top: 0.6rem;
}
.note-a { top: 0.2rem; }
.note-b { top: 34%; }
.note-c { top: 72%; }
.margin-note p:first-child {
  font-size: 0.75rem;
  color: var(--ghost);
  margin-bottom: 0.3rem;
}
.margin-note p:last-child {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--ink-soft);
}

/* Rise-in for margin notes + specimen */
[data-rise] {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--rise-ms) ease-out, transform var(--rise-ms) ease-out;
}
[data-rise].in-view { opacity: 1; transform: none; }

/* ---- Editions ---- */
.editions-list { border-top: 1px solid var(--ink); }
.edition {
  display: grid;
  grid-template-columns: 4.5rem 8rem minmax(0, 1fr) 14rem 4.5rem auto;
  gap: 1.5rem;
  align-items: center;
  padding: 1.6rem 0.5rem;
  border-bottom: 1px solid var(--hairline);
}
.edition-zebra { background: var(--paper-deep); }
.edition:hover { background: var(--paper-deep); }
.edition-zebra:hover { background: var(--paper); }
.edition-no { font-size: 0.85rem; color: var(--ghost); }
.edition-body h3 { font-size: 1.15rem; margin-bottom: 0.3rem; }
.edition-desc { font-size: 0.92rem; color: var(--ink-soft); max-width: 46ch; }
.edition-spec { font-size: 0.75rem; color: var(--ink-soft); }
.edition-price { font-size: 1rem; font-weight: 500; text-align: right; }
.editions-foot {
  margin-top: 1.4rem;
  font-size: 0.75rem;
  color: var(--ghost);
  letter-spacing: 0.04em;
}
.editions-foot a { color: var(--ink-soft); }

/* CSS ink illustrations for editions */
.edition-ill { display: grid; place-items: center; }
.ill {
  width: 7rem;
  height: 5.2rem;
  border: 1.5px solid var(--ink);
  background: var(--paper);
  position: relative;
}
.ill-ledger::before {
  content: "";
  position: absolute;
  inset: 0.6rem 1rem;
  border-left: 3px solid var(--ink);
}
.ill-ledger::after {
  content: "";
  position: absolute;
  left: 1.6rem; right: 1.2rem; top: 1.1rem;
  height: 0.9rem;
  background: repeating-linear-gradient(
    to bottom, var(--hairline) 0 1px, transparent 1px 0.45rem);
}
.ill-cards {
  transform: rotate(-4deg);
}
.ill-cards::before {
  content: "";
  position: absolute;
  inset: 1rem 1.4rem;
  border: 1.5px solid var(--ink);
}
.ill-cards::after {
  content: "";
  position: absolute;
  left: 50%; top: 55%;
  width: 1.6rem; height: 1.6rem;
  transform: translate(-50%, -50%) rotate(45deg);
  background: var(--ink);
  opacity: 0.85;
}
.ill-marginalia::before {
  content: "";
  position: absolute;
  inset: 0.6rem 0.6rem 0.6rem 3rem;
  background: repeating-linear-gradient(
    to bottom, var(--hairline) 0 1px, transparent 1px 0.45rem);
}
.ill-marginalia::after {
  content: "";
  position: absolute;
  inset: 0.6rem auto 0.6rem 0.8rem;
  width: 0.35rem;
  background: var(--ink);
}

/* ---- Specimen ---- */
.specimen {
  max-width: var(--measure);
  border-top: 1px solid var(--ink);
  padding-top: 2rem;
}
.specimen-row {
  font-family: var(--serif);
  border-bottom: 1px solid var(--hairline);
  padding: 1.2rem 0;
  overflow-wrap: anywhere;
}
.specimen-caps { font-size: clamp(1.6rem, 4.5vw, 2.8rem); font-weight: 700; letter-spacing: 0.06em; }
.specimen-lower { font-size: clamp(1.6rem, 4.5vw, 2.8rem); font-style: italic; letter-spacing: 0.04em; }
.specimen-figures {
  font-family: var(--mono);
  font-size: clamp(1rem, 2.5vw, 1.4rem);
  color: var(--ink-soft);
}
.specimen-weights {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0 2.5rem;
  padding-top: 1.6rem;
}
.spec-weight { padding: 0.4rem 0; border-bottom: 1px solid var(--hairline); }
.w-regular { font-weight: 400; }
.w-italic { font-style: italic; font-family: var(--serif); font-weight: 400; }
.w-bold { font-weight: 600; }
.w-mono { font-family: var(--mono); font-size: 0.92rem; }

/* ---- FAQ accordion ---- */
.faq { max-width: var(--measure); }
.faq-item { border-bottom: 1px solid var(--hairline); }
.faq-item:first-child { border-top: 1px solid var(--ink); }
.faq-item h3 { font-size: 1rem; font-weight: 400; }
.faq-trigger {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: var(--serif);
  font-size: 1.05rem;
  color: var(--ink);
  padding: 1.1rem 0.25rem;
}
.faq-trigger:hover { background: var(--paper-deep); }
.faq-x { font-size: 1.1rem; color: var(--ink-soft); flex-shrink: 0; transition: transform 200ms ease; }
.faq-trigger[aria-expanded="true"] .faq-x { transform: rotate(45deg); }
.faq-panel {
  overflow: hidden;
  padding: 0 0.25rem;
  color: var(--ink-soft);
}
.faq-panel p { padding-bottom: 1.2rem; max-width: 55ch; font-size: 0.95rem; }
.faq-panel[hidden] { display: none; }
.faq-panel.animating { display: block; }

/* ---- Colophon ---- */
.colophon {
  border-top: 2px solid var(--ink);
  background: var(--paper-deep);
}
.colophon-inner {
  max-width: 82rem;
  margin: 0 auto;
  padding: clamp(3rem, 8vh, 5rem) var(--gutter) 2rem;
}
.colophon-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--hairline);
}
.colophon-title { font-size: 1.6rem; margin-bottom: 0.8rem; }
.colophon-h {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ghost);
  margin-bottom: 1rem;
}
.colophon-text { font-size: 0.92rem; color: var(--ink-soft); margin-bottom: 1.4rem; }
.colophon-block .btn { margin-top: 0.4rem; }
.colophon-list { font-size: 0.8rem; }
.colophon-list dt {
  color: var(--ghost);
  display: inline;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-right: 0.6rem;
}
.colophon-list dd { display: inline; color: var(--ink-soft); }
.colophon-list div { padding: 0.25rem 0; }
.colophon-foot {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding-top: 1.4rem;
  font-size: 0.72rem;
  color: var(--ghost);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.totop { color: var(--ink-soft); text-decoration: none; }
.totop:hover { color: var(--ink); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1100px) {
  .margin-note { position: static; width: auto; max-width: none; margin: 1.2rem 0 1.2rem 1.2rem; border-left: 2px solid var(--hairline); border-top: none; padding: 0.2rem 0 0.2rem 1rem; }
  .prose-with-notes { display: grid; }
}
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; }
  .device { max-width: 26rem; }
  .edition {
    grid-template-columns: 4rem minmax(0, 1fr) auto;
    grid-template-areas:
      "no  body price"
      "ill body spec"
      "ill body cta";
    row-gap: 0.8rem;
  }
  .edition-no { grid-area: no; }
  .edition-ill { grid-area: ill; }
  .edition-body { grid-area: body; }
  .edition-spec { grid-area: spec; align-self: end; }
  .edition-price { grid-area: price; }
  .edition .btn { grid-area: cta; justify-self: start; }
  .colophon-grid { grid-template-columns: 1fr; gap: 2.4rem; }
}
@media (max-width: 720px) {
  .nav-links a:not(.btn) { display: none; }
  .section-head { grid-template-columns: 1fr; gap: 0.4rem; }
  .section-lede { grid-column: 1; }
  .specimen-weights { grid-template-columns: 1fr; }
  .specimen-caps, .specimen-lower { font-size: 1.5rem; }
  .edition {
    grid-template-columns: 1fr;
    grid-template-areas:
      "no"
      "ill"
      "body"
      "spec"
      "price"
      "cta";
  }
  .edition-price { text-align: left; }
  .device-frame { box-shadow: 4px 4px 0 0 var(--hairline); }
}

/* ============================================================
   REDUCED MOTION
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .flash { display: none; }
  .flash.is-flashing { animation: none; }
  .hero-line { opacity: 1; transform: none; animation: none; }
  [data-rise] { opacity: 1; transform: none; transition: none; }
  .faq-x { transition: none; }
  .btn { transition: none; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}