:root {
  --bg: #efe7d8;
  --bg-deep: #e4d8c4;
  --paper: #fffaf1;
  --ink: #221c16;
  --ink-soft: #5e554a;
  --line: #d4c6ae;
  --seal: #a32020;
  --seal-soft: #f3d6d2;
  --ok: #2b5a3c;
  --ok-soft: #d7eadc;
  --warn: #8a5a12;
  --warn-soft: #f4e3c2;
  --shadow: 0 18px 50px rgba(68, 48, 24, 0.1);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  color: var(--ink);
  font-family: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC",
    "Microsoft YaHei", ui-sans-serif, sans-serif;
  line-height: 1.65;
  background:
    radial-gradient(circle at 12% 0%, rgba(255, 255, 255, 0.55), transparent 36%),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(90, 70, 40, 0.03) 3px
    ),
    var(--bg);
}

a {
  color: var(--seal);
}

.wrap {
  width: min(720px, calc(100% - 32px));
  margin: 0 auto;
  padding: 36px 0 64px;
}

.letter {
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: 36px 32px 32px;
  position: relative;
}

.letter:before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(163, 32, 32, 0.12);
  pointer-events: none;
}

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
}

.kicker {
  margin: 0 0 8px;
  color: var(--ink-soft);
  font-size: 13px;
  letter-spacing: 0.22em;
}

h1 {
  margin: 0;
  font-family: "Songti SC", "STSong", "Noto Serif SC", Georgia, serif;
  font-size: clamp(32px, 6vw, 44px);
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 1.2;
}

.lead {
  margin: 12px 0 0;
  color: var(--ink-soft);
  font-size: 16px;
}

.seal {
  flex: none;
  width: 76px;
  height: 76px;
  display: grid;
  place-items: center;
  border: 3px solid var(--seal);
  box-shadow: inset 0 0 0 2px var(--seal);
  color: var(--seal);
  font-family: "Songti SC", "STSong", serif;
  font-size: 15px;
  letter-spacing: 0.28em;
  text-indent: 0.28em;
  transform: rotate(-9deg);
}

.promises {
  display: grid;
  gap: 10px;
  margin: 0 0 28px;
  padding: 0;
  list-style: none;
}

.promises li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  color: var(--ink-soft);
  font-size: 14px;
}

.promises li:before {
  content: "○";
  color: var(--seal);
  line-height: 1.4;
}

label.block,
.legend {
  display: block;
  margin: 0 0 10px;
  font-size: 15px;
  font-weight: 600;
}

.hint {
  display: block;
  margin-top: 6px;
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 400;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chips input,
.hp {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
  margin: 0;
  pointer-events: none;
}

.chip {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  user-select: none;
}

.chip:has(input:focus-visible) {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

.chip:has(input:checked) {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--paper);
}

.field {
  margin-bottom: 22px;
}

textarea {
  width: 100%;
  min-height: 180px;
  padding: 14px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  font: inherit;
  resize: vertical;
}

textarea:focus,
input[type="url"]:focus,
input[type="text"]:focus {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 8px;
}

button,
.btn {
  appearance: none;
  border: 0;
  background: var(--ink);
  color: var(--paper);
  min-height: 46px;
  padding: 0 22px;
  font: inherit;
  font-weight: 600;
  letter-spacing: 0.08em;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

button:disabled {
  opacity: 0.55;
  cursor: wait;
}

button.secondary,
.btn.secondary {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}

.note,
.status {
  margin: 14px 0 0;
  padding: 12px 14px;
  font-size: 14px;
}

.note {
  background: var(--warn-soft);
  color: var(--warn);
}

.status.ok {
  background: var(--ok-soft);
  color: var(--ok);
}

.status.err {
  background: var(--seal-soft);
  color: var(--seal);
}

.hidden {
  display: none !important;
}

.done {
  text-align: center;
  padding: 28px 8px 8px;
}

.done h2 {
  margin: 0 0 8px;
  font-family: "Songti SC", "STSong", Georgia, serif;
  font-size: 30px;
}

.done p {
  margin: 0;
  color: var(--ink-soft);
}

footer {
  margin-top: 22px;
  color: var(--ink-soft);
  font-size: 12px;
}

.setup ol {
  padding-left: 1.2em;
}

.setup li {
  margin: 0 0 12px;
}

.setup textarea,
.setup input {
  width: 100%;
  margin-top: 8px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  background: #fff;
  font: inherit;
}

.codebox {
  position: relative;
}

pre {
  overflow: auto;
  max-height: 280px;
  padding: 12px;
  background: #221c16;
  color: #f4ead8;
  font-size: 12px;
  line-height: 1.5;
}

@media (max-width: 640px) {
  .wrap {
    width: calc(100% - 20px);
    padding-top: 18px;
  }

  .letter {
    padding: 24px 18px 22px;
  }

  .seal {
    width: 64px;
    height: 64px;
    font-size: 13px;
  }
}