.coa-layout {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: start;
}

.coa-card {
  background: var(--white);
  border: 1px solid var(--rule);
  border-radius: var(--r);
  padding: clamp(1.25rem, 3vw, 2rem);
}

.coa-tabs {
  display: flex;
  gap: 1.5rem;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 1.5rem;
}

.coa-tab {
  padding: 0 0 0.75rem;
  margin-bottom: -1px;
  border: 0;
  border-bottom: 1.5px solid transparent;
  background: none;
  font: 500 0.95rem var(--font-sans);
  color: var(--muted);
  cursor: pointer;
}
.coa-tab:hover { color: var(--ink); }
.coa-tab.active { color: var(--ink); border-bottom-color: var(--ink); }

.coa-panel { display: none; }
.coa-panel.active { display: block; }

.coa-label { display: block; margin-bottom: 0.5rem; color: var(--muted); }

.coa-input-row {
  display: flex;
  border: 1px solid var(--ink);
  border-radius: var(--r);
  background: var(--paper);
  overflow: hidden;
}
.coa-input-row:focus-within { background: #fff; box-shadow: 0 0 0 3px rgba(18, 18, 18, 0.1); }

.coa-input,
.coa-company-input {
  flex: 1 1 auto;
  min-width: 0;
  height: 52px;
  padding: 0 1rem;
  border: 0;
  background: transparent;
  font: 500 1rem var(--font-sans);
  color: var(--ink);
}
.coa-input { font-family: var(--font-mono); font-size: 0.95rem; }
.coa-input:focus,
.coa-company-input:focus { outline: none; }

.coa-search-btn {
  padding: 0 1.4rem;
  border: 0;
  border-left: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  font: 500 0.9rem var(--font-sans);
  cursor: pointer;
  white-space: nowrap;
}
.coa-search-btn:hover { background: #2a2a28; }
.coa-search-btn:disabled { opacity: 0.7; cursor: wait; }

.coa-hint { margin: 0.65rem 0 0; font-size: 0.875rem; color: var(--muted); }
.coa-example-link { color: var(--ink); font-family: var(--font-mono); font-size: 0.85em; }

.coa-result-wrap { margin-top: 1.5rem; }
.coa-result-wrap.hidden { display: none; }
.coa-verify { margin-top: 1.25rem; min-height: 65px; }
.coa-verify.hidden { display: none; }
.coa-verify-note { margin: 0 0 0.6rem; font-size: 0.875rem; color: var(--muted); }

.coa-result {
  border: 1px solid var(--rule);
  border-radius: var(--r);
  overflow: hidden;
}

.coa-result-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  padding: 0.85rem 1.1rem;
  border-bottom: 1.5px solid var(--ink);
}
.coa-result-title {
  font: 400 0.7rem var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}
.coa-result-code { font: 600 0.9rem var(--font-mono); color: var(--ink); }

.coa-result-body { padding: 0.25rem 1.1rem 1.1rem; }

.coa-result-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--rule);
  font-size: 0.9rem;
}
.coa-result-label { color: var(--muted); }
.coa-result-val { color: var(--ink); font-family: var(--font-mono); font-size: 0.85rem; text-align: right; }
.coa-result-val.pass { color: var(--pass); font-weight: 600; }
.coa-actions { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 1.1rem; }
.coa-actions .btn { flex: 1 1 160px; }

.coa-error {
  padding: 1rem 1.1rem;
  border-left: 2px solid var(--signal);
  background: var(--paper);
  font-size: 0.925rem;
  color: var(--ink-2);
}
.coa-error strong { display: block; margin-bottom: 0.2rem; color: var(--ink); }

.coa-file-list { border: 1px solid var(--rule); border-radius: var(--r); overflow: hidden; }
.coa-file-list-header {
  display: flex;
  justify-content: space-between;
  padding: 0.75rem 1.1rem;
  border-bottom: 1.5px solid var(--ink);
  font: 400 0.7rem var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}
.coa-file-scroll { max-height: 380px; overflow-y: auto; }
.coa-file-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  padding: 0.7rem 1.1rem;
  border-bottom: 1px solid var(--rule);
}
.coa-file-item:last-child { border-bottom: 0; }
.coa-file-item:hover { background: var(--paper); }
.coa-file-code { font: 500 0.875rem var(--font-mono); color: var(--ink); }
.coa-file-open { font-size: 0.85rem; color: var(--ink); }

.coa-spinner {
  display: inline-block;
  width: 12px;
  height: 12px;
  margin-right: 0.4rem;
  border: 1.5px solid rgba(243, 242, 238, 0.35);
  border-top-color: var(--paper);
  border-radius: 50%;
  vertical-align: -1px;
  animation: coa-spin 0.7s linear infinite;
}
@keyframes coa-spin { to { transform: rotate(360deg); } }

/* Guide aside */
.coa-guide { padding-top: 0.25rem; }
.coa-guide ol { list-style: none; margin: 1rem 0 1.75rem; padding: 0; border-top: 1px solid var(--rule-strong); }
.coa-guide li {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--rule);
  font-size: 0.925rem;
  color: var(--ink-2);
}
.coa-guide li .mono { color: var(--signal); padding-top: 0.15rem; }

.coa-sample {
  background: var(--white);
  border: 1px solid var(--rule);
  border-radius: var(--r);
  padding: 1rem 1.1rem;
}
.coa-sample-title { display: block; margin-bottom: 0.75rem; font-size: 0.7rem; }
.coa-sample-parts { display: flex; flex-wrap: wrap; gap: 0.75rem 0.35rem; align-items: start; }
.coa-sample-part { display: grid; gap: 0.4rem; }
.coa-sample-part .mono {
  max-width: 11rem;
  padding-top: 0.4rem;
  border-top: 2px solid currentColor;
  font-size: 0.62rem;
  line-height: 1.4;
}
.coa-sample-part:first-child .mono { color: var(--signal); }
.coa-sample-part:last-child .mono { color: var(--muted); border-top-color: var(--ink); }
.coa-sample-code { font: 500 clamp(1.1rem, 2.2vw, 1.35rem) var(--font-mono); letter-spacing: 0.02em; }
.coa-sample-code.prefix { color: var(--signal); }
.coa-sample-code.accession { color: var(--ink); }

/* Detail view */
.coa-back { display: inline-block; margin-bottom: 1.5rem; color: var(--muted); text-decoration: none; }
.coa-back:hover { color: var(--ink); }

.coa-status-loading { color: var(--muted); }
.coa-status-loading:empty { display: none; }

.coa-detail-grid { display: none; gap: 1.5rem; }
.coa-detail-grid.has-pdf {
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
  align-items: start;
}

.coa-meta-card {
  background: var(--white);
  border: 1px solid var(--rule);
  border-radius: var(--r);
  padding: 1.25rem;
  position: sticky;
  top: calc(var(--header-h) + 1rem);
}
.coa-meta-card h1 {
  font: 600 1.15rem var(--font-mono);
  letter-spacing: 0;
  padding-bottom: 0.75rem;
  border-bottom: 1.5px solid var(--ink);
  word-break: break-all;
}
.coa-meta-card .coa-sub { margin: 0.75rem 0 0.25rem; font-size: 0.85rem; color: var(--muted); }

.coa-pdf-frame {
  width: 100%;
  height: calc(100vh - var(--header-h) - 3rem);
  min-height: 560px;
  border: 1px solid var(--rule);
  border-radius: var(--r);
  background: #fff;
}

@media (max-width: 1024px) {
  .coa-layout { grid-template-columns: 1fr; }
  .coa-detail-grid.has-pdf { grid-template-columns: 1fr; }
  .coa-meta-card { position: static; }
  .coa-pdf-frame { height: 80vh; min-height: 480px; }
}

@media (max-width: 560px) {
  .coa-input-row { flex-direction: column; }
  .coa-search-btn { height: 48px; border-left: 0; border-top: 1px solid var(--ink); }
  .coa-result-row { flex-direction: column; gap: 0.15rem; }
  .coa-result-val { text-align: left; }
}