/* Visual identity: the tamper-evident security envelope.
   Paper: cool cheque stock. Ink: deep navy. Tint: the blue security pattern printed inside envelopes,
   here made of the real ciphertext. Void red only for burned/destructive states. */

@font-face {
  font-family: "Anybody";
  src: url("/static/fonts/anybody.woff2") format("woff2");
  font-weight: 100 900;
  font-stretch: 50% 150%;
  font-display: swap;
}
@font-face {
  font-family: "Hanken Grotesk";
  src: url("/static/fonts/hanken-grotesk.woff2") format("woff2");
  font-weight: 100 900;
  font-display: swap;
}
@font-face {
  font-family: "Martian Mono";
  src: url("/static/fonts/martian-mono.woff2") format("woff2");
  font-weight: 100 800;
  font-stretch: 75% 112.5%;
  font-display: swap;
}

:root {
  --paper: #e9edf1;
  --sheet: #f6f8fa;
  --envelope: #dde4ec;
  --ink: #142038;
  --ink-2: #4a5874;
  --tint: #5b7397;
  --rule: rgba(20, 32, 56, 0.14);
  --void: #b8361f;
  --focus: #2f5aa8;
  --on-ink: #f6f8fa;
  --shadow: 0 1px 0 rgba(255, 255, 255, 0.7) inset, 0 22px 40px -26px rgba(20, 32, 56, 0.6), 0 2px 6px rgba(20, 32, 56, 0.1);
  --display: "Anybody", "Arial Black", sans-serif;
  --body: "Hanken Grotesk", system-ui, sans-serif;
  --mono: "Martian Mono", ui-monospace, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0d1420; --sheet: #141d2c; --envelope: #1a2638; --ink: #e4e9f1; --ink-2: #93a1b8;
    --tint: #4f6a93; --rule: rgba(228, 233, 241, 0.12); --void: #e8705a; --focus: #8fb1f0; --on-ink: #0d1420;
    --shadow: 0 1px 0 rgba(255, 255, 255, 0.04) inset, 0 22px 40px -24px rgba(0, 0, 0, 0.8), 0 2px 6px rgba(0, 0, 0, 0.3);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0d1420; --sheet: #141d2c; --envelope: #1a2638; --ink: #e4e9f1; --ink-2: #93a1b8;
  --tint: #4f6a93; --rule: rgba(228, 233, 241, 0.12); --void: #e8705a; --focus: #8fb1f0; --on-ink: #0d1420;
  --shadow: 0 1px 0 rgba(255, 255, 255, 0.04) inset, 0 22px 40px -24px rgba(0, 0, 0, 0.8), 0 2px 6px rgba(0, 0, 0, 0.3);
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; background: var(--paper); color: var(--ink); }
body { font: 16px/1.5 var(--body); -webkit-font-smoothing: antialiased; }
button, input, textarea { font: inherit; color: inherit; }

.sheet { max-width: 520px; margin: 0 auto; padding: 28px 18px 48px; display: grid; gap: 28px; }

/* ---------- masthead ---------- */
.masthead { display: grid; gap: 10px; }
.masthead::before {
  content: ""; height: 6px; border-radius: 1px;
  background: repeating-linear-gradient(-45deg, var(--tint) 0 1.5px, transparent 1.5px 5px);
  opacity: 0.55;
}
.kicker { margin: 0; color: var(--ink-2); font-weight: 600; font-size: 13px; }
.title {
  margin: 0; font-family: var(--display); font-weight: 820; font-stretch: 138%;
  font-size: clamp(38px, 11vw, 52px); line-height: 0.9; letter-spacing: -0.015em; text-transform: uppercase;
  text-wrap: balance;
}
.lede { margin: 0; color: var(--ink-2); max-width: 40ch; }

/* ---------- compose ---------- */
.compose { display: grid; gap: 18px; }
.field { display: grid; gap: 7px; }
.field-label, legend { font-weight: 700; font-size: 14px; padding: 0; }
.field-hint { color: var(--ink-2); font-size: 13px; }
textarea, input[type="password"], input[type="text"], input:not([type]) {
  width: 100%; background: var(--sheet); border: 1px solid var(--rule); border-radius: 8px; padding: 12px 14px;
}
textarea { font-family: var(--mono); font-size: 14px; line-height: 1.6; resize: vertical; min-height: 128px; }
textarea::placeholder, input::placeholder { color: var(--ink-2); opacity: 0.7; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
textarea:focus, input:focus { outline: 2px solid var(--focus); outline-offset: 0; border-color: transparent; }

fieldset { border: 0; margin: 0; padding: 0; display: grid; gap: 8px; min-width: 0; }
.seg { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; border: 1px solid var(--rule); border-radius: 8px; overflow: hidden; background: var(--sheet); }
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg label {
  text-align: center; padding: 10px 4px; font-size: 14px; font-weight: 600; cursor: pointer; color: var(--ink-2);
  border-left: 1px solid var(--rule); transition: background 0.15s, color 0.15s;
}
.seg label:first-of-type { border-left: 0; }
.seg input:checked + label { background: var(--ink); color: var(--on-ink); }
.seg input:focus-visible + label { outline: 2px solid var(--focus); outline-offset: -3px; }

.extras { border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.extras summary { cursor: pointer; padding: 12px 0; font-weight: 700; font-size: 14px; list-style: none; display: flex; justify-content: space-between; }
.extras summary::-webkit-details-marker { display: none; }
.extras summary::after { content: "+"; font-family: var(--mono); color: var(--ink-2); }
.extras[open] summary::after { content: "−"; }
.extras-body { display: grid; gap: 14px; padding-bottom: 16px; }

.toggle { display: flex; gap: 10px; align-items: center; font-size: 15px; cursor: pointer; }
.toggle input { width: 18px; height: 18px; accent-color: var(--ink); margin: 0; }

.primary {
  border: 0; border-radius: 8px; padding: 15px 18px; background: var(--ink); color: var(--on-ink);
  font-weight: 700; font-size: 16px; cursor: pointer; transition: transform 0.12s ease, opacity 0.15s;
}
.primary:active { transform: translateY(1px); }
.primary:disabled { opacity: 0.55; cursor: progress; }
.ghost { border: 1px solid var(--rule); border-radius: 8px; padding: 14px 18px; background: transparent; font-weight: 700; cursor: pointer; }
.link-btn { border: 0; background: none; padding: 4px 0; color: var(--ink-2); font-weight: 600; font-size: 14px; cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
.err { margin: 0; color: var(--void); font-weight: 600; }
.note, .caption { margin: 0; color: var(--ink-2); font-size: 14px; }

/* ---------- the envelope (signature) ---------- */
.envelope {
  position: relative; aspect-ratio: 1.6 / 1; border-radius: 6px; overflow: hidden;
  background: var(--envelope); box-shadow: var(--shadow);
}
.tint {
  position: absolute; inset: -20%; padding: 6px; color: var(--tint); opacity: 0.5;
  font: 500 8px/10px var(--mono); letter-spacing: 0.04em; word-break: break-all; overflow: hidden;
  transform: rotate(-9deg); user-select: none;
}
.flap {
  position: absolute; inset: 0 0 auto 0; height: 58%;
  background: linear-gradient(to bottom, var(--envelope), var(--envelope));
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  filter: drop-shadow(0 2px 0 var(--rule));
  transform-origin: top center;
}
.flap::after {
  content: ""; position: absolute; inset: 0; clip-path: polygon(0 0, 100% 0, 50% 100%);
  background: linear-gradient(to bottom, transparent 60%, rgba(20, 32, 56, 0.06));
}
.window {
  position: absolute; left: 7%; right: 7%; bottom: 11%; display: grid; gap: 4px;
  background: color-mix(in srgb, var(--sheet) 92%, transparent); border: 1px solid var(--rule); border-radius: 4px;
  padding: 11px 13px; box-shadow: 0 1px 2px rgba(20, 32, 56, 0.08) inset;
}
.window-label { font-size: 11px; font-weight: 700; color: var(--ink-2); letter-spacing: 0.02em; }
.link { font: 500 12.5px/1.45 var(--mono); word-break: break-all; color: var(--ink); user-select: all; }
.sealed { display: grid; gap: 14px; }
.sealed .flap { animation: seal 0.55s cubic-bezier(0.2, 0.7, 0.2, 1) both; }
@keyframes seal { from { transform: perspective(600px) rotateX(-178deg); } to { transform: perspective(600px) rotateX(0); } }
.actions { display: grid; grid-template-columns: 1fr auto; gap: 10px; }
.actions .primary:only-child { grid-column: 1 / -1; }

/* ---------- ledger of sealed secrets ---------- */
.ledger { display: grid; gap: 10px; }
.ledger-head { display: flex; justify-content: space-between; align-items: baseline; border-bottom: 2px solid var(--ink); padding-bottom: 8px; }
.ledger h2 { margin: 0; font-family: var(--display); font-stretch: 125%; font-weight: 760; font-size: 17px; text-transform: uppercase; letter-spacing: 0.01em; }
.ledger ul { list-style: none; margin: 0; padding: 0; }
.ledger li { display: grid; grid-template-columns: 30px 1fr auto; gap: 12px; align-items: center; padding: 12px 0; border-bottom: 1px solid var(--rule); }
.mini {
  width: 30px; height: 20px; border-radius: 2px; background: var(--envelope); position: relative; overflow: hidden;
  box-shadow: 0 0 0 1px var(--rule) inset;
}
.mini::before {
  content: ""; position: absolute; inset: 0; clip-path: polygon(0 0, 100% 0, 50% 62%);
  background: var(--tint); opacity: 0.45;
}
.row-title { font-weight: 700; overflow-wrap: anywhere; }
.row-meta { font: 500 11.5px/1.5 var(--mono); color: var(--ink-2); }
.revoke { border: 0; background: none; color: var(--void); font-weight: 700; font-size: 14px; cursor: pointer; padding: 8px 0 8px 8px; }
.empty { margin: 4px 0 0; color: var(--ink-2); }

/* ---------- viewer: tear strip ---------- */
.tear {
  position: relative; width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 12px;
  border: 0; border-radius: 0 0 6px 6px; padding: 18px 18px 16px; margin-top: -8px;
  background: var(--ink); color: var(--on-ink); font-weight: 700; font-size: 16px; cursor: pointer;
  transition: transform 0.45s cubic-bezier(0.5, 0, 0.8, 0.4), opacity 0.45s;
}
.tear::before {  /* perforation along the top edge */
  content: ""; position: absolute; left: 0; right: 0; top: 0; height: 6px;
  background: radial-gradient(circle at 5px 0, var(--paper) 2.6px, transparent 3px) 0 0 / 10px 6px repeat-x;
}
.tear-arrow { font-family: var(--mono); font-size: 18px; }
.tear.torn { transform: translateX(108%) rotate(2.5deg); opacity: 0; }
.intro { display: grid; gap: 0; }
.intro .note { margin-top: 14px; }
.closed { border-radius: 6px 6px 0 0; }

.letter {
  position: relative; background: var(--sheet); border-radius: 0 0 6px 6px; padding: 26px 18px 18px;
  box-shadow: var(--shadow); display: grid; gap: 14px; animation: rise 0.4s ease-out both;
}
.letter::before {  /* torn top edge */
  content: ""; position: absolute; left: 0; right: 0; top: -9px; height: 10px;
  background: linear-gradient(135deg, var(--sheet) 50%, transparent 50%) 0 0 / 14px 10px repeat-x,
              linear-gradient(-135deg, var(--sheet) 50%, transparent 50%) 0 0 / 14px 10px repeat-x;
}
.letter pre {
  margin: 0; white-space: pre-wrap; overflow-wrap: anywhere; font: 500 15px/1.65 var(--mono); color: var(--ink);
  padding: 14px; border: 1px dashed var(--rule); border-radius: 6px; user-select: all;
}
@keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
.passbox { display: grid; gap: 12px; }

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