:root {
  --bg: #0f1115;
  --panel: #171a21;
  --border: #2a2f3a;
  --text: #e6e8eb;
  --muted: #9aa3af;
  --accent: #4f8cff;
  --pass: #3ecf8e;
  --fail: #ff5c5c;
  --info: #d8b34a;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 16px;
  max-width: 720px;
  margin-inline: auto;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.page-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

h1 {
  font-size: 1.5rem;
  margin: 0.4em 0 0;
}

.tagline {
  color: var(--muted);
  margin-top: 4px;
}

.lang-toggle,
.choose-btn,
.example-btn,
.again-btn {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 14px;
  cursor: pointer;
  font-size: 0.95rem;
}
.lang-toggle:hover,
.choose-btn:hover,
.example-btn:hover,
.again-btn:hover {
  border-color: var(--accent);
}

.error {
  background: #331414;
  border: 1px solid var(--fail);
  color: var(--text);
  border-radius: 8px;
  padding: 10px 14px;
  margin-bottom: 12px;
}

.dropzone {
  border: 2px dashed var(--border);
  border-radius: 10px;
  padding: 32px 16px;
  text-align: center;
}
.dropzone.dragover {
  border-color: var(--accent);
  background: rgba(79, 140, 255, 0.08);
}

.dropzone-label {
  color: var(--muted);
  margin: 0 0 12px;
}

.examples {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
}
.or-label {
  color: var(--muted);
}
.example {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.example-desc {
  color: var(--muted);
  font-size: 0.82rem;
  margin: 0;
  max-width: 220px;
}

.spinner {
  text-align: center;
  color: var(--muted);
  padding: 24px 0;
}

.result {
  margin-top: 20px;
}

.verdict {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 16px;
  border-radius: 10px;
  text-align: center;
}
.verdict-valid {
  background: rgba(62, 207, 142, 0.12);
  color: var(--pass);
  border: 1px solid var(--pass);
}
.verdict-invalid {
  background: rgba(255, 92, 92, 0.12);
  color: var(--fail);
  border: 1px solid var(--fail);
}

.receipt-summary {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 12px;
  margin: 16px 0;
  padding: 12px 14px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
}
.receipt-summary dt {
  color: var(--muted);
}
.receipt-summary dd {
  margin: 0;
  word-break: break-all;
}

.checks {
  list-style: none;
  padding: 0;
  margin: 16px 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.check {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2px 12px;
  padding: 10px 14px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-left: 4px solid var(--border);
  border-radius: 6px;
}
.check-pass {
  border-left-color: var(--pass);
}
.check-fail {
  border-left-color: var(--fail);
}
.check-info {
  border-left-color: var(--info);
}
.check-name {
  font-weight: 600;
}
.check-status {
  text-align: right;
  font-size: 0.85rem;
  text-transform: uppercase;
}
.status-pass {
  color: var(--pass);
}
.status-fail {
  color: var(--fail);
}
.status-info {
  color: var(--info);
}
.status-not_checked,
.status-skipped {
  color: var(--muted);
}
.check-detail {
  grid-column: 1 / -1;
  color: var(--muted);
  font-size: 0.9rem;
  word-break: break-word;
}
.check-reasons {
  grid-column: 1 / -1;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.82rem;
  color: var(--fail);
  word-break: break-word;
}

.again-btn {
  display: block;
  margin: 8px auto 0;
}

.notes {
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.note {
  color: var(--muted);
  font-size: 0.85rem;
}

.page-footer {
  margin-top: 24px;
  text-align: center;
  color: var(--muted);
  font-size: 0.78rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (max-width: 420px) {
  h1 {
    font-size: 1.2rem;
  }
  .verdict {
    font-size: 1.4rem;
  }
  .dropzone {
    padding: 20px 10px;
  }
  .examples {
    flex-direction: column;
    align-items: stretch;
  }
}