:root {
  --paper: #f6f4ee;
  --ink: #1c1b17;
  --ink-2: #57544a;
  --ink-3: #8a8578;
  --line: rgba(28, 27, 23, 0.16);
  --line-soft: rgba(28, 27, 23, 0.07);
  --blue: #1d44a8;
  --green: #1a7f37;
  --red: #b3261e;
  --amber: #9a6700;
  --mono: ui-monospace, "Cascadia Mono", "SF Mono", Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { -webkit-text-size-adjust: 100%; }

body {
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 28px 28px;
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.65;
  padding: 48px 20px 64px;
}

.sheet { max-width: 900px; margin: 0 auto; }

/* ---------- masthead ---------- */
.masthead {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 28px;
  align-items: end;
  padding-bottom: 22px;
  border-bottom: 2px solid var(--ink);
}
.doc-no {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--blue);
  border: 1px solid var(--blue);
  padding: 2px 8px;
  margin-bottom: 14px;
}
.masthead h1 {
  font-size: clamp(26px, 4.5vw, 38px);
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.2;
}
.abstract {
  margin-top: 12px;
  max-width: 62ch;
  color: var(--ink-2);
  font-size: 14px;
}
.titleblock {
  display: grid;
  grid-template-columns: auto auto;
  border: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 12px;
}
.titleblock div { display: contents; }
.titleblock dt {
  color: var(--ink-3);
  padding: 6px 12px;
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
  white-space: nowrap;
}
.titleblock dd {
  color: var(--ink);
  padding: 6px 12px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
.titleblock div:last-child dt, .titleblock div:last-child dd { border-bottom: none; }

/* ---------- sections ---------- */
.sec { margin-top: 36px; }
.sec h2 {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
}
.sec-no {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--paper);
  background: var(--ink);
  padding: 2px 7px;
}
.sec-rule { flex: 1; height: 1px; background: var(--line); }
.sec-hint {
  margin-top: 14px;
  max-width: 72ch;
  font-size: 12.5px;
  color: var(--ink-2);
}

/* ---------- specs ---------- */
.specs {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--line);
}
.spec { padding: 16px 18px 18px; border-right: 1px solid var(--line); }
.spec:last-child { border-right: none; }
.spec-head {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 10px;
}
.tag {
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.08em;
  padding: 1px 6px;
  border: 1px solid currentColor;
}
.tag-front { color: var(--blue); }
.tag-backend { color: var(--amber); }
.tag-link { color: var(--green); }
.spec code {
  display: block;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink);
  background: rgba(28, 27, 23, 0.045);
  border-left: 2px solid var(--ink);
  padding: 7px 10px;
  word-break: break-all;
  cursor: copy;
  transition: background-color 0.15s ease-out;
}
.spec code:hover { background: rgba(29, 68, 168, 0.09); }
.spec p { margin-top: 10px; font-size: 12.5px; color: var(--ink-2); }

/* ---------- entries (backend links) ---------- */
.entries {
  margin-top: 14px;
  list-style: none;
  border: 1px solid var(--line);
}
.entry {
  display: grid;
  grid-template-columns: 52px minmax(0, auto) minmax(0, 1fr) auto;
  gap: 14px;
  align-items: baseline;
  padding: 13px 16px;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: var(--ink);
  transition: background-color 0.15s ease-out;
}
.entries li:last-child .entry { border-bottom: none; }
.entry:hover { background: rgba(29, 68, 168, 0.06); }
.entry-method {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--blue);
  border: 1px solid var(--blue);
  padding: 1px 6px;
  text-align: center;
}
.entry-path { font-family: var(--mono); font-size: 13px; font-weight: 500; }
.entry-desc { font-size: 12.5px; color: var(--ink-2); }
.entry-go { font-family: var(--mono); font-size: 14px; color: var(--blue); }

/* ---------- log ---------- */
.log {
  margin-top: 16px;
  list-style: none;
  font-family: var(--mono);
  font-size: 12.5px;
}
.log-item {
  display: grid;
  grid-template-columns: 96px 62px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: baseline;
  padding: 8px 2px;
  border-bottom: 1px dashed var(--line);
}
.log-item:first-child { border-top: 1px solid var(--line); }
.log-time { color: var(--ink-3); font-size: 11.5px; }
.log-kind {
  border: 1px solid currentColor;
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-align: center;
  padding: 0 5px;
}
.log-label { color: var(--ink); word-break: break-all; }
.log-detail { color: var(--ink-3); font-size: 11.5px; text-align: right; }
.log-PASS .log-kind { color: var(--green); }
.log-FAIL .log-kind { color: var(--red); }
.log-INFO .log-kind { color: var(--blue); }
.log-OPEN .log-kind { color: var(--amber); }
.log:empty::after {
  content: "暂无记录";
  color: var(--ink-3);
  font-size: 12px;
}

/* ---------- verdict buttons ---------- */
.verdict { display: inline-flex; gap: 6px; }
.v-btn {
  font-family: var(--mono);
  font-size: 11px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink-2);
  padding: 2px 12px;
  cursor: pointer;
  border-radius: 2px;
  transition: border-color 0.15s ease-out, color 0.15s ease-out;
}
.v-btn:hover { border-color: var(--ink); color: var(--ink); }

/* ---------- guestbook ---------- */
code.inline {
  font-family: var(--mono);
  font-size: 12px;
  background: rgba(28, 27, 23, 0.06);
  padding: 1px 5px;
}
.gb-form {
  margin-top: 16px;
  border: 1px solid var(--line);
  padding: 16px 18px;
}
.gb-row {
  display: flex;
  gap: 10px;
  align-items: stretch;
}
.gb-input {
  flex: 1;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 9px 12px;
  outline: none;
  transition: border-color 0.15s ease-out;
}
.gb-input:focus { border-color: var(--blue); }
.gb-textarea {
  margin-top: 10px;
  width: 100%;
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 10px 12px;
  resize: vertical;
  outline: none;
  transition: border-color 0.15s ease-out;
}
.gb-textarea:focus { border-color: var(--blue); }
.gb-status {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 12px;
  min-height: 18px;
}
.gb-ok { color: var(--green); }
.gb-err { color: var(--red); }
.gb-loading { color: var(--ink-3); }
.gb-list {
  margin-top: 14px;
  list-style: none;
  border: 1px solid var(--line);
}
.gb-item {
  padding: 12px 16px;
  border-bottom: 1px dashed var(--line);
}
.gb-list li:last-child { border-bottom: none; }
.gb-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 4px;
}
.gb-name {
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
}
.gb-time {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  white-space: nowrap;
}
.gb-text {
  font-size: 13px;
  color: var(--ink-2);
  white-space: pre-wrap;
  word-break: break-word;
}
.gb-empty {
  padding: 18px 16px;
  font-size: 12.5px;
  color: var(--ink-3);
  text-align: center;
}

/* ---------- notes ---------- */
.notes {
  margin-top: 18px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--line);
}
.note { padding: 16px 18px; }
.note:first-child { border-right: 1px solid var(--line); }
.note h3 { font-size: 13px; font-weight: 700; margin-bottom: 8px; }
.note h3::before {
  content: "\25C6";
  color: var(--blue);
  font-size: 10px;
  margin-right: 8px;
  vertical-align: 1px;
}
.note p { font-size: 12.5px; color: var(--ink-2); }

/* ---------- footer ---------- */
.foot {
  margin-top: 44px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.06em;
}

/* ---------- responsive ---------- */
@media (max-width: 720px) {
  body { padding: 28px 14px 48px; }
  .masthead { grid-template-columns: 1fr; align-items: start; }
  .specs { grid-template-columns: 1fr; }
  .spec { border-right: none; border-bottom: 1px solid var(--line); }
  .spec:last-child { border-bottom: none; }
  .entry { grid-template-columns: 46px minmax(0, 1fr) auto; }
  .entry-desc { grid-column: 2 / -1; grid-row: 2; }
  .notes { grid-template-columns: 1fr; }
  .note:first-child { border-right: none; border-bottom: 1px solid var(--line); }
  .log-item { grid-template-columns: 80px 56px 1fr; }
  .log-detail { grid-column: 3; text-align: left; }
}

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