/**
 * Aexa Post-Quantum Vault — V0.1.
 *
 * System fonts only. No external stylesheet, no font service, no icon set: the page must load
 * every byte it needs from its own origin, and the Content-Security-Policy forbids anything
 * else. Colours are defined once as tokens and both themes are described, so the page is
 * legible whichever the operating system asks for.
 */

:root {
  color-scheme: light dark;

  --paper: #f2f4f6;
  --surface: #ffffff;
  --surface-2: #e9ecf0;
  --ink: #12171e;
  --ink-2: #3a434f;
  --muted: #5d6875;
  --line: #d3d9e0;
  --line-strong: #a9b3c0;
  --accent: #17457a;
  --accent-ink: #ffffff;
  --accent-soft: #e3ecf6;
  --ok: #1f6152;
  --ok-soft: #e1efea;
  --warn: #8a5a0c;
  --warn-soft: #f8eedc;
  --crit: #9e2b20;
  --crit-soft: #f7e5e2;

  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0d1117;
    --surface: #151b23;
    --surface-2: #1d242e;
    --ink: #e7ecf2;
    --ink-2: #bfc8d4;
    --muted: #8e9aa9;
    --line: #2a323d;
    --line-strong: #414b58;
    --accent: #7fb2e5;
    --accent-ink: #0d1117;
    --accent-soft: #16283c;
    --ok: #68bfa6;
    --ok-soft: #12281f;
    --warn: #dcaf5f;
    --warn-soft: #2e2413;
    --crit: #e8877b;
    --crit-soft: #331915;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

/* --- beta banner ------------------------------------------------------------------------ */

.beta-banner {
  background: var(--warn-soft);
  border-bottom: 2px solid var(--warn);
  color: var(--ink-2);
  padding: 12px 24px;
  font-size: 14px;
  line-height: 1.45;
}
.beta-banner strong { color: var(--warn); }

/* --- masthead -------------------------------------------------------------------------- */

.masthead {
  max-width: 760px;
  margin: 0 auto;
  padding: 44px 24px 12px;
}
.wordmark {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.42em;
  color: var(--muted);
  margin-bottom: 10px;
}
h1 {
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 10px;
  font-weight: 650;
}
.tagline { font-size: 20px; margin: 0 0 2px; color: var(--ink); font-weight: 550; }
.subtagline { font-size: 16px; margin: 0; color: var(--muted); }

/* --- layout ---------------------------------------------------------------------------- */

main { max-width: 760px; margin: 0 auto; padding: 20px 24px 8px; }
h2 { font-size: 24px; margin: 4px 0 6px; letter-spacing: -0.01em; font-weight: 620; }
h3 { font-size: 17px; margin: 0 0 10px; font-weight: 600; }
h4 { font-size: 15px; margin: 18px 0 4px; font-weight: 620; }
p { margin: 0 0 12px; }

.view { padding: 8px 0 24px; }

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 24px 0 20px; }
.keyline { color: var(--muted); font-size: 15px; }

.local-note {
  color: var(--ok);
  font-size: 15px;
  font-weight: 550;
}
.local-note.strong { font-size: 16px; }

/* --- controls -------------------------------------------------------------------------- */

button {
  font: inherit;
  cursor: pointer;
  border-radius: 3px;
  border: 1px solid transparent;
  padding: 11px 20px;
  transition: background-color 0.12s ease, border-color 0.12s ease;
}
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
.primary:hover:not(:disabled) { filter: brightness(1.08); }
.primary:disabled { background: var(--surface-2); color: var(--muted); border-color: var(--line); cursor: not-allowed; }

.secondary { background: var(--surface); color: var(--ink); border-color: var(--line-strong); font-weight: 550; }
.secondary:hover { background: var(--surface-2); }
.secondary.small { padding: 8px 14px; font-size: 14px; }

.link {
  background: none; border: none; padding: 0;
  color: var(--accent); text-decoration: underline; font-weight: 550;
}
.back {
  background: none; border: none; padding: 4px 0 12px;
  color: var(--muted); font-size: 14px;
}
.back:hover { color: var(--accent); }

input[type="password"] {
  font: inherit;
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  background: var(--surface);
  color: var(--ink);
}
input[type="password"]:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

.field-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 6px;
  display: block;
}

.checkbox {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin: 12px 0;
  font-size: 15px;
  color: var(--ink-2);
  cursor: pointer;
}
.checkbox input { margin-top: 4px; flex: none; }

.hint { color: var(--muted); font-size: 14px; line-height: 1.45; }
.step-help { color: var(--ink-2); }

/* --- panels and steps ------------------------------------------------------------------ */

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 20px;
  margin: 16px 0;
}
.panel.result { border-top: 3px solid var(--ok); }

.steps { list-style: none; padding: 0; margin: 20px 0 0; counter-reset: step; }
.step {
  border-top: 1px solid var(--line);
  padding: 20px 0;
}
.step:first-child { border-top: none; padding-top: 4px; }
.step-number {
  display: inline-flex;
  align-items: center; justify-content: center;
  width: 22px; height: 22px;
  margin-right: 9px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
}

/* --- dropzones ------------------------------------------------------------------------- */

.dropzone {
  border: 1.5px dashed var(--line-strong);
  border-radius: 4px;
  background: var(--surface);
  padding: 26px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.12s ease, background-color 0.12s ease;
}
.dropzone:hover, .dropzone:focus-visible { border-color: var(--accent); background: var(--accent-soft); }
.dropzone:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.dropzone.dragging { border-color: var(--accent); background: var(--accent-soft); border-style: solid; }
.dropzone.loaded { border-style: solid; border-color: var(--ok); background: var(--ok-soft); }
.dz-title { margin: 0 0 2px; font-weight: 600; }
.dz-sub { margin: 0; color: var(--muted); font-size: 14px; }
.dropzone code { font-family: var(--mono); font-size: 0.92em; }

.selected {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-2);
  background: var(--surface-2);
  border-radius: 3px;
  padding: 8px 12px;
  margin: 10px 0 0;
  overflow-wrap: anywhere;
}

/* --- fingerprint ----------------------------------------------------------------------- */

.fingerprint {
  font-family: var(--mono);
  font-size: clamp(17px, 3.4vw, 23px);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink);
  background: var(--surface-2);
  border-left: 3px solid var(--accent);
  padding: 12px 14px;
  margin: 0 0 10px;
  overflow-wrap: anywhere;
}

.recipient-shown { margin-top: 16px; }

/* --- progress -------------------------------------------------------------------------- */

.progress { margin: 20px 0; }
.progress-note { color: var(--ok); font-weight: 550; font-size: 15px; }
.stage-list { list-style: none; padding: 0; margin: 0; }
.stage-list li {
  font-family: var(--mono);
  font-size: 13.5px;
  color: var(--muted);
  padding: 7px 0 7px 26px;
  position: relative;
}
.stage-list li::before {
  content: "";
  position: absolute; left: 6px; top: 13px;
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--line-strong);
}
.stage-list li.active { color: var(--ink); }
.stage-list li.active::before { background: var(--accent); }
.stage-list li.done { color: var(--ok); }
.stage-list li.done::before { background: var(--ok); }

/* --- results and messages -------------------------------------------------------------- */

.meta-line { font-family: var(--mono); font-size: 13px; color: var(--muted); }
.download-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 14px 0; }

.sender-warning {
  background: var(--warn-soft);
  border-left: 3px solid var(--warn);
  padding: 12px 14px;
  font-size: 14.5px;
  color: var(--ink-2);
  margin: 16px 0 0;
}
.sender-warning strong { color: var(--warn); }

.error {
  background: var(--crit-soft);
  border-left: 3px solid var(--crit);
  color: var(--ink);
  padding: 12px 14px;
  margin: 16px 0 0;
  font-size: 15px;
}

.checksum { margin-top: 14px; }
.checksum summary { cursor: pointer; color: var(--accent); font-size: 14px; }
.mono-block {
  font-family: var(--mono);
  font-size: 12.5px;
  background: var(--surface-2);
  padding: 10px 12px;
  border-radius: 3px;
  overflow-wrap: anywhere;
  margin: 8px 0 0;
}

/* --- explainer and colophon ------------------------------------------------------------ */

.explainer {
  max-width: 760px;
  margin: 8px auto 0;
  padding: 0 24px;
}
.explainer summary {
  cursor: pointer;
  font-weight: 600;
  padding: 14px 0;
  border-top: 1px solid var(--line);
  color: var(--accent);
}
.explainer-body { padding-bottom: 12px; color: var(--ink-2); font-size: 15px; }
.explainer-body h4 { color: var(--ink); }

.colophon {
  max-width: 760px;
  margin: 24px auto 0;
  padding: 16px 24px 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11.5px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

/* --- profile choice (Generate) ------------------------------------------------------------ */
.choice-group { border: 0; padding: 0; margin: 0 0 1.25rem; }
.choice-group legend { padding: 0; }
.choice { display: flex; gap: .6rem; align-items: flex-start; padding: .55rem .7rem; margin: .35rem 0;
  border: 1px solid var(--line, #d7d9de); border-radius: .5rem; cursor: pointer; }
.choice input { margin-top: .25rem; flex: 0 0 auto; }
.choice span { font-size: .93rem; line-height: 1.4; }
.choice:has(input:checked) { border-color: var(--accent, #1f4b99); box-shadow: 0 0 0 1px var(--accent, #1f4b99) inset; }

/* --- three equal actions on the home view ------------------------------------------------- */
.actions-three { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .75rem; }
.actions-three .primary { width: 100%; }
@media (max-width: 640px) { .actions-three { grid-template-columns: 1fr; } }