:root {
  --wall: #EFE4CC;
  --wall-deep: #E4D4B4;
  --manila: #E2C07A;
  --manila-deep: #C9A45A;
  --manila-in: #F4E3B0;
  --paper: #F7F0DE;
  --ink: #241C14;
  --ink-soft: #5A4A38;
  --steel: #6E7682;
  --steel-light: #C8CED4;
  --stamp: #2B4A78;
  --stamp-ink: #1E3558;
  --tab: #B85A3A;
  --nav: #1C2A38;
  --shadow: rgba(70, 48, 18, 0.16);
  --serif: "Source Serif 4", "Iowan Old Style", Georgia, serif;
  --sans: "IBM Plex Sans", "Helvetica Neue", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--wall);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.5;
}
img { max-width: 100%; }
button, input, textarea { font: inherit; }
a { color: var(--stamp); }

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--nav);
  color: var(--paper);
  padding: 0.5rem 0.8rem;
  border-radius: 999px;
  z-index: 40;
}
.skip-link:focus { top: 1rem; }

.eyebrow {
  margin: 0 0 0.4rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--stamp);
}
.lede { color: var(--ink-soft); max-width: 38rem; }
h1, h2, h3 { font-family: var(--serif); font-weight: 560; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.8rem, 3vw, 2.6rem); line-height: 1.15; margin: 0 0 0.8rem; }

.btn-primary, .nav-pill, .btn-stamp {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 999px;
  padding: 0.7rem 1.1rem;
  background: var(--stamp);
  color: var(--paper);
  text-decoration: none;
  cursor: pointer;
  box-shadow: 0 1px 0 rgba(255,255,255,0.2) inset, 0 8px 18px var(--shadow);
}
.btn-ghost, .nav-ghost {
  border: 1px solid rgba(36, 28, 20, 0.18);
  background: transparent;
  color: var(--ink);
  border-radius: 999px;
  padding: 0.62rem 1rem;
  cursor: pointer;
}
.btn-stamp { background: var(--tab); }

/* Opening */
.opening {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at 20% 10%, rgba(43, 74, 120, 0.08), transparent 40%),
    repeating-linear-gradient(0deg, transparent, transparent 23px, rgba(36,28,20,0.03) 24px),
    var(--wall);
  position: relative;
  overflow: hidden;
}
.opening-wall { text-align: center; width: min(520px, 92vw); }
.opening-kicker, .opening-brand, .opening-line { opacity: 0; transform: translateY(10px); }
.opening-folder {
  position: relative;
  height: 280px;
  margin: 1.2rem auto 1.6rem;
  width: min(360px, 86vw);
}
.opening-back, .opening-pocket, .opening-flap {
  position: absolute;
  inset: 48px 18px 18px;
  background: var(--manila);
  border: 1.5px solid var(--ink);
  border-radius: 0 12px 12px 12px;
  box-shadow: 0 18px 40px var(--shadow);
}
.opening-pocket {
  inset: 86px 38px 38px;
  background: var(--manila-in);
  border-radius: 4px;
}
.opening-flap {
  inset: 28px 18px auto 18px;
  height: 72px;
  background: var(--manila-deep);
  border-radius: 10px 10px 0 0;
  transform-origin: top center;
  transform: rotateX(0deg);
  opacity: 0;
}
.opening-tab {
  position: absolute;
  right: 18px;
  top: -12px;
  background: var(--tab);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 0.65rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}
.opening-card {
  position: absolute;
  left: 78px;
  top: 118px;
  width: 168px;
  height: 104px;
  background: var(--paper);
  border: 1.2px solid var(--ink);
  border-radius: 4px;
  padding: 0.7rem;
  text-align: left;
  opacity: 0;
  transform: translateY(16px);
  box-shadow: 0 8px 16px var(--shadow);
}
.opening-card-kind {
  display: block;
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--stamp);
}
.opening-card-title {
  display: block;
  font-family: var(--serif);
  font-size: 1.15rem;
  margin-top: 0.35rem;
}
.opening-clip {
  position: absolute;
  left: 50%;
  top: 78px;
  width: 34px;
  height: 46px;
  margin-left: -17px;
  background:
    radial-gradient(circle at 50% 18%, var(--stamp) 3px, transparent 3.2px),
    linear-gradient(var(--steel-light), var(--steel));
  border: 1.2px solid var(--ink);
  border-radius: 6px 6px 10px 10px;
  opacity: 0;
  transform: translateY(-10px);
}
.opening-brand {
  font-size: clamp(2.4rem, 7vw, 4rem);
  margin: 0;
}
.opening-line { margin: 0.4rem 0 0; color: var(--ink-soft); }
.opening-kicker {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--stamp);
}
.opening-skip {
  position: absolute;
  right: 1.2rem;
  top: 1.2rem;
  border: 0;
  background: var(--nav);
  color: var(--paper);
  border-radius: 999px;
  padding: 0.55rem 0.9rem;
  cursor: pointer;
}
.opening.is-kicker .opening-kicker,
.opening.is-brand .opening-brand,
.opening.is-line .opening-line { opacity: 1; transform: none; transition: 0.6s ease; }
.opening.is-flap .opening-flap { opacity: 1; transition: 0.7s ease; }
.opening.is-clip .opening-clip { opacity: 1; transform: none; transition: 0.45s ease; }
.opening.is-card .opening-card { opacity: 1; transform: none; transition: 0.55s ease; }

@media (prefers-reduced-motion: reduce) {
  .opening-kicker, .opening-brand, .opening-line, .opening-flap, .opening-clip, .opening-card {
    opacity: 1;
    transform: none;
  }
}

/* App */
.app { min-height: 100vh; }
.nav-wrap {
  position: sticky;
  top: 0.8rem;
  z-index: 8;
  padding: 0 1rem;
}
.nav {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: var(--nav);
  color: var(--paper);
  padding: 0.55rem 0.7rem 0.55rem 0.85rem;
  border-radius: 999px;
  box-shadow: 0 12px 30px var(--shadow);
}
.nav-mark {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  color: inherit;
  text-decoration: none;
  font-family: var(--serif);
  font-size: 1.1rem;
}
.nav-mark img { border-radius: 8px; }
.nav-links { display: flex; gap: 1rem; }
.nav-links a { color: #E8E2D4; text-decoration: none; font-size: 0.92rem; }
.nav-end { display: flex; gap: 0.5rem; align-items: center; }
.nav-ghost { color: #E8E2D4; border-color: rgba(247,240,222,0.22); }
.nav-pill { background: var(--manila); color: var(--ink); }

.hero { padding: 2.2rem 1.2rem 1rem; }
.hero-stage {
  max-width: 1120px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  gap: 2rem;
  align-items: start;
}
.folder {
  position: relative;
  min-height: 520px;
  background:
    radial-gradient(circle at 80% 0%, rgba(43,74,120,0.08), transparent 36%),
    linear-gradient(180deg, #F3E7C8, var(--wall));
  border-radius: 28px;
  padding: 3.2rem 2rem 2rem;
  box-shadow: 0 18px 40px var(--shadow);
}
.folder-back {
  position: absolute;
  inset: 72px 36px 48px;
  background: var(--manila);
  border: 1.6px solid var(--ink);
  border-radius: 0 18px 18px 18px;
}
.folder-pocket {
  position: absolute;
  inset: 132px 68px 88px;
  background:
    repeating-linear-gradient(180deg, transparent, transparent 18px, rgba(36,28,20,0.04) 19px),
    var(--manila-in);
  border: 1.2px solid rgba(36,28,20,0.35);
  border-radius: 6px;
  padding: 1.4rem 1.2rem 1rem;
}
.folder-flap {
  position: absolute;
  left: 36px;
  right: 36px;
  top: 54px;
  height: 86px;
  background: var(--manila-deep);
  border: 1.6px solid var(--ink);
  border-bottom: 0;
  border-radius: 16px 16px 0 0;
  transform-origin: top center;
}
.folder[data-state="closed"] .folder-flap {
  height: 210px;
  border-bottom: 1.6px solid var(--ink);
  border-radius: 16px;
  z-index: 3;
}
.folder[data-state="closed"] .folder-pocket,
.folder[data-state="closed"] .specimen-card { filter: saturate(0.6); }
.folder-tab, .folder-date {
  position: absolute;
  top: -12px;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
}
.folder-tab {
  right: 22px;
  background: var(--tab);
  color: var(--paper);
  padding: 0.28rem 0.55rem;
  border-radius: 5px;
}
.folder-date { left: 22px; color: var(--stamp-ink); }
.folder-clip {
  position: absolute;
  left: 50%;
  top: 108px;
  width: 42px;
  height: 58px;
  margin-left: -21px;
  z-index: 4;
}
.clip-head {
  display: block;
  width: 42px;
  height: 22px;
  background: linear-gradient(#D5DBE0, var(--steel));
  border: 1.3px solid var(--ink);
  border-radius: 8px 8px 4px 4px;
  position: relative;
}
.clip-head::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 6px;
  width: 8px;
  height: 8px;
  margin-left: -4px;
  background: var(--stamp);
  border-radius: 50%;
}
.clip-arms {
  display: block;
  width: 28px;
  height: 34px;
  margin: -2px auto 0;
  background: linear-gradient(var(--steel-light), #8A929C);
  border: 1.2px solid var(--ink);
  border-radius: 0 0 10px 10px;
}
.folder-empty { margin: 2.2rem 0 0; color: var(--ink-soft); font-size: 0.95rem; }
.specimen-card {
  background: var(--paper);
  border: 1.2px solid var(--ink);
  border-radius: 6px;
  padding: 1rem 1rem 0.85rem;
  box-shadow: 0 10px 22px var(--shadow);
  min-height: 168px;
}
.card-kind {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--stamp);
}
.card-title { margin: 0.35rem 0 0.5rem; font-size: 1.5rem; }
.card-wall { margin: 0; color: var(--ink-soft); }
.card-stamp {
  margin: 0.8rem 0 0;
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--tab);
}
.folder-remain {
  position: absolute;
  left: 48px;
  right: 48px;
  bottom: 18px;
  margin: 0;
  text-align: center;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-soft);
}

.pin-desk { padding-top: 0.4rem; }
.pin-form {
  margin-top: 1.2rem;
  background: var(--paper);
  border-radius: 20px;
  padding: 1.1rem 1.1rem 1.2rem;
  box-shadow: 0 10px 24px var(--shadow);
}
.pin-form fieldset { border: 0; padding: 0; margin: 0 0 0.8rem; }
.pin-form legend, .pin-form label {
  display: block;
  font-size: 0.8rem;
  margin-bottom: 0.35rem;
  color: var(--ink-soft);
}
.kind-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.kind-grid label {
  margin: 0;
  border: 1px solid rgba(36,28,20,0.14);
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
  font-size: 0.78rem;
  color: var(--ink);
  cursor: pointer;
}
.kind-grid input { accent-color: var(--stamp); }
.kind-grid label:has(input:checked) {
  background: var(--stamp);
  color: var(--paper);
  border-color: var(--stamp);
}
.pin-form input, .pin-form textarea {
  width: 100%;
  border: 1px solid rgba(36,28,20,0.16);
  background: #FFF9EC;
  border-radius: 12px;
  padding: 0.65rem 0.75rem;
  margin-bottom: 0.75rem;
  color: var(--ink);
}
.row-actions, .desk-actions { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.desk-actions { margin-top: 1rem; }
.hint { margin: 0.75rem 0 0; font-size: 0.85rem; color: var(--ink-soft); }

.drawers, .editorial, .method, .kit { max-width: 1120px; margin: 0 auto; padding: 2.4rem 1.2rem; }
.drawer-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.8rem;
}
.drawer-list li {
  background: var(--manila-deep);
  border: 1.2px solid var(--ink);
  border-radius: 12px;
  padding: 0.9rem 1rem;
  min-height: 92px;
}
.drawer-list .empty {
  background: transparent;
  border-style: dashed;
  color: var(--ink-soft);
}

.editorial {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
}
.editorial-figure {
  margin: 0;
  background: var(--wall-deep);
  border-radius: 24px;
  padding: 0.8rem;
  box-shadow: 0 12px 28px var(--shadow);
}
.editorial-figure figcaption {
  padding: 0.4rem 0.6rem 0.2rem;
  font-size: 0.82rem;
  color: var(--ink-soft);
}
.steps { list-style: none; padding: 0; margin: 1.2rem 0 0; display: grid; gap: 1rem; }
.steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  background: var(--paper);
  border-radius: 18px;
  padding: 1rem 1.1rem;
}
.step-n { font-family: var(--mono); color: var(--stamp); }
.steps h3 { margin: 0 0 0.3rem; font-size: 1.15rem; }
.steps p { margin: 0; color: var(--ink-soft); }

.kit {
  background: var(--paper);
  border-radius: 28px;
  margin-bottom: 2rem;
  box-shadow: 0 12px 28px var(--shadow);
}
.foot {
  padding: 1.4rem 1.2rem 2.4rem;
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.soon {
  position: fixed;
  inset: 0;
  background: rgba(28, 42, 56, 0.46);
  display: grid;
  place-items: center;
  padding: 1rem;
  z-index: 20;
}
.soon-card {
  width: min(440px, 100%);
  background: var(--paper);
  border-radius: 22px;
  padding: 1.4rem 1.3rem;
  box-shadow: 0 18px 40px var(--shadow);
}
.soon-keep {
  background: var(--manila-in);
  border-radius: 12px;
  padding: 0.7rem 0.8rem;
  font-size: 0.88rem;
}

@media (max-width: 860px) {
  .hero-stage, .editorial { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .folder { min-height: 460px; }
  .folder-pocket { inset: 120px 36px 78px; }
  .folder-back, .folder-flap { left: 18px; right: 18px; }
}