:root {
  --paper: #f8fafc;
  --paper-2: #ffffff;
  --ink: #0f172a;
  --muted: #475569;
  --line: #e2e8f0;
  --seal: #2563eb;
  --seal-ink: #ffffff;
  --pine: #10b981;
  --pine-ink: #ffffff;
  --brass: #2563eb;
  --brass-ink: #ffffff;
  --focus: #2563eb;
  --shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
  color-scheme: light;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(141, 47, 44, 0.08), transparent 28rem),
    var(--paper);
  color: var(--ink);
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  font-size: 1.05rem;
  line-height: 1.5;
}

h1, h2, h3 {
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

a { color: var(--seal); }
a:hover { text-decoration-thickness: 2px; }

.skip {
  position: absolute;
  left: 0.75rem;
  top: -3rem;
  background: var(--ink);
  color: var(--paper);
  padding: 0.5rem 0.8rem;
  z-index: 5;
}

.skip:focus { top: 0.75rem; }

.site-header, .wrap, .site-footer { width: min(1080px, calc(100% - 2rem)); margin: 0 auto; }

.site-header { padding: 0.85rem 0 0.25rem; }

.brand-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem 1rem;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--ink);
  font-weight: 750;
  text-decoration: none;
  min-height: 44px;
}
.logo-mark {
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 0.55rem;
  background: var(--seal);
  color: var(--seal-ink);
  font-size: 0.85rem;
  font-weight: 800;
}
.lang-switch { display: flex; align-items: center; gap: 0.35rem; min-height: 44px; }
.lang-switch button { min-height: 44px; background: transparent; color: var(--ink); border: 1px solid transparent; padding: 0.2rem 0.45rem; }
.lang-switch button[aria-pressed="true"] { border-color: var(--ink); font-weight: 800; }
.early {
  display: inline-block;
  margin: 0 0 0.7rem;
  padding: 0.12rem 0.45rem;
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
}
.unlock-all { width: 100%; font-weight: 750; }
.banner {
  margin: 0.9rem 0;
  padding: 0.85rem 1rem;
  border: 1px solid var(--pine);
  background: color-mix(in srgb, var(--pine) 12%, var(--paper));
}
.modal {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: rgba(20, 16, 12, 0.46);
  z-index: 20;
}
.modal[hidden] { display: none; }
.modal-card {
  width: min(36rem, 100%);
  padding: 1.1rem;
  background: var(--paper-2);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.kicker {
  margin: 0 0 0.2rem;
  color: var(--seal);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.brand h1, .brand p.product { margin: 0; font-size: 1.8rem; }

.tagline { margin: 0.25rem 0 0; color: var(--muted); max-width: 38rem; }

.nav { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0; padding: 0; list-style: none; }

.nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--line);
  background: var(--paper-2);
  color: var(--ink);
  text-decoration: none;
}

.nav a[aria-current="page"] { border-color: var(--ink); box-shadow: inset 0 -3px 0 var(--seal); }

.pill {
  margin-left: 0.45rem;
  padding: 0.05rem 0.35rem;
  border: 1px solid var(--seal);
  color: var(--seal);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

main { padding-bottom: 3rem; }

.hero { text-align: center; padding: 2.2rem 0 0.4rem; }
.hero h1 { margin: 0; font-size: clamp(2.4rem, 5vw, 3.5rem); }
.safety { margin: 0.7rem auto 0; max-width: 38rem; color: #065f46; background: #d1fae5; display: inline-block; padding: 0.35rem 0.7rem; border-radius: 999px; }

.dropzone {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  min-height: calc(100vh - 16rem);
  margin: 1.4rem 0 0;
  padding: 2.4rem 1.2rem;
  border: 2px dashed var(--line);
  border-radius: 1.25rem;
  background: var(--paper-2);
}
.dropzone.is-over { border-color: var(--seal); background: color-mix(in srgb, var(--seal) 8%, var(--paper-2)); }
.dropzone.is-compact {
  min-height: 0;
  align-items: stretch;
  padding: 0.85rem 1rem;
}
.file-bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.6rem; width: 100%; }
.file-bar[hidden], #drop-hero[hidden] { display: none; }
.file-name { margin: 0; font-weight: 700; overflow-wrap: anywhere; }
.file-actions { display: flex; flex-wrap: wrap; gap: 0.45rem; }
.notice { margin: 0.9rem 0 0; padding: 0.85rem 1rem; border: 1px solid var(--brass); background: var(--paper-2); }
.knowledge { margin-top: 3rem; }
.knowledge h2 { font-size: 1.6rem; }
.faq article { margin: 1rem 0 1.4rem; }
.faq h3 { font-size: 1.2rem; margin: 0 0 0.35rem; }
.cap-table { width: 100%; border-collapse: collapse; margin: 0.6rem 0 1.6rem; }
.cap-table th, .cap-table td { text-align: left; vertical-align: top; padding: 0.55rem 0.6rem; border-bottom: 1px solid var(--line); }
.tool-links { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-bottom: 0.6rem; }
.zip-primary { width: 100%; min-height: 56px; font-size: 1.05rem; font-weight: 750; }
.select-file {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: auto;
  min-height: 56px;
  margin: 0;
  padding: 0.8rem 1.5rem;
  border-radius: 999px;
  background: var(--seal);
  color: var(--seal-ink);
  font-size: 1.05rem;
  cursor: pointer;
}
input.file-input[type="file"] {
  position: absolute;
  width: 1px;
  height: 1px;
  min-height: 0;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  border: 0;
}
.dropzone:focus-within { outline: 3px solid var(--focus); outline-offset: 4px; }
.drop-hint, .drop-limit { margin: 0; text-align: center; color: var(--muted); }
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}
.reveal { display: grid; grid-template-rows: 0fr; transition: grid-template-rows 0.28s ease; }
.reveal[hidden] { display: none; }
.reveal.is-open { display: block; }
.reveal-inner { min-height: 0; overflow: hidden; }
.reveal.is-open .reveal-inner { overflow: visible; }
.below { margin: 2.5rem 0 1rem; }
.tool-card {
  max-width: 46rem;
  margin: 1rem auto;
  padding: 1.1rem 1.15rem;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 1rem;
}

.lede, .panel, .pass, .prose, .closed-card {
  background: var(--paper-2);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.lede, .panel, .pass, .closed-card { padding: 1.1rem 1.15rem; margin: 1rem 0; }

.lede h2, .panel h2, .closed-card h2 { margin: 0 0 0.4rem; font-size: 2rem; }

.stamp {
  display: inline-block;
  margin: 0 0 0.8rem;
  padding: 0.25rem 0.55rem;
  border: 3px solid var(--seal);
  color: var(--seal);
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transform: rotate(-2deg);
}

.drop {
  margin-top: 1rem;
  padding: 1rem;
  border: 1.5px dashed var(--muted);
  background: rgba(255, 255, 255, 0.28);
}

.drop.is-over { border-color: var(--seal); background: rgba(141, 47, 44, 0.06); }

label { display: block; font-weight: 650; margin-bottom: 0.3rem; }

input[type="file"], input[type="text"], button, .button {
  font: inherit;
}

input[type="text"], input[type="file"] {
  width: 100%;
  min-height: 44px;
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
}

fieldset { margin: 1rem 0 0; padding: 0.8rem; border: 1px solid var(--line); }
legend { padding: 0 0.3rem; font-weight: 700; }
.modes { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 0.45rem 0.8rem; }
.modes label { font-weight: 550; }

.help, .detail, .preview, .muted { color: var(--muted); }
.help, .detail, .preview { margin: 0.35rem 0 0; }

#status, #error, #clear-status { min-height: 1.4em; }
#error:not(:empty), #status:not(:empty) { margin: 0.8rem 0 0; }
#error:not(:empty) { color: var(--seal); font-weight: 700; }

.support summary { cursor: pointer; font-weight: 700; min-height: 44px; display: flex; align-items: center; }
.support ul { margin: 0.4rem 0 0.8rem; padding-left: 1.2rem; }

.pass { border-color: var(--brass); }
.pass h2 { font-size: 1.45rem; }

.chapter-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.75rem; }

.chapter {
  display: grid;
  grid-template-columns: auto 1fr minmax(180px, 280px) auto;
  gap: 0.8rem 1rem;
  align-items: start;
  padding: 0.9rem;
  border: 1px solid var(--line);
  background: var(--paper);
}

.chapter.is-locked { background: transparent; }

.pick { font-size: 0.85rem; }
.chapter-title h3 { margin: 0.25rem 0; font-size: 1.35rem; }
.chapter-name label { font-size: 0.85rem; }

.badge {
  display: inline-block;
  padding: 0.12rem 0.45rem;
  font-size: 0.75rem;
  font-weight: 750;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.badge.free { background: var(--pine); color: var(--pine-ink); }
.badge.locked { background: var(--brass); color: var(--brass-ink); }

.button, button {
  min-height: 44px;
  padding: 0.45rem 0.8rem;
  border: 1px solid var(--seal);
  background: var(--seal);
  color: var(--seal-ink);
  cursor: pointer;
}
.button.secondary, button.secondary { background: transparent; color: var(--ink); }
button:disabled, .button:disabled { cursor: not-allowed; opacity: 0.55; }

.actions { display: flex; flex-wrap: wrap; gap: 0.6rem; margin: 0.8rem 0 1rem; }

.closed-card { max-width: 46rem; }
.choice { display: grid; gap: 0.35rem; margin: 1rem 0; }
.choice label { font-weight: 550; }
.explain { margin-top: 1rem; padding: 0.9rem; border-left: 4px solid var(--seal); background: var(--paper); }

.prose { padding: 1.2rem 1.3rem; }
.prose h2 { font-size: 1.4rem; margin-top: 1.4rem; }
.prose ul { padding-left: 1.2rem; }

.site-footer { padding: 0 0 2.5rem; color: var(--muted); }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 0.8rem; }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

@media (max-width: 800px) {
  .chapter { grid-template-columns: 1fr; }
  .brand h1, .brand p.product, .lede h2, .panel h2, .closed-card h2 { font-size: 1.7rem; }
  .site-header, .wrap, .site-footer { width: min(1080px, calc(100% - 1.2rem)); }
  .nav a { padding: 0.35rem 0.6rem; }
  .dropzone { min-height: calc(100vh - 12rem); padding: 1.6rem 0.9rem; }
  .select-file { max-width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .stamp, .reveal { transition: none; }
}

body { overflow-x: clip; }
.mode-bar, .mode-grid, .actions, .option-row { display: flex; flex-wrap: wrap; gap: 0.6rem; align-items: center; }
.mode-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.mode-card, .advantages article, .spec-list li {
  background: var(--paper-2);
  border: 1px solid var(--line);
  padding: 0.9rem;
  text-align: left;
}
.mode-card svg { width: 1.6rem; height: 1.6rem; color: var(--seal); display: block; }
.mode-card span, .advantages p { display: block; color: var(--muted); font-weight: 450; }
.mode-card em { color: var(--pine); font-style: normal; font-size: 0.85rem; }
.spec-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.45rem; }
.spec-list li { display: flex; justify-content: space-between; gap: 0.8rem; }
.spec-list [data-status="support"] strong { color: var(--pine); }
.spec-list [data-status="caution"] strong { color: #b45309; }
.spec-list [data-status="reject"] strong { color: #b91c1c; }
.zip-primary { background: var(--seal); color: #fff; }
@media (max-width: 800px) {
  .mode-grid { grid-template-columns: 1fr; }
}