:root {
  --blue: #1a5fa4;
  --blue-dark: #0f3f75;
  --green: #2f7d32;
  --green-bg: #e9f6ea;
  --red: #a31515;
  --red-bg: #fbeaea;
  --amber: #8a6300;
  --amber-bg: #fff6e0;
  --border: #d8dee4;
  --text: #1f2933;
  --muted: #5a6672;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", Helvetica, Arial, sans-serif;
  color: var(--text);
  background: #f5f7f9;
  line-height: 1.5;
}

.wrap {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  background: linear-gradient(180deg, var(--blue), var(--blue-dark));
  color: #fff;
  padding: 24px 0;
}

.site-header h1 {
  margin: 0 0 4px;
  font-size: 1.6rem;
}

.tagline {
  margin: 0;
  font-size: 0.9rem;
  color: #d7e6f5;
}

.tabs {
  display: flex;
  gap: 4px;
  margin: 24px 0 0;
  border-bottom: 2px solid var(--border);
}

.tab {
  padding: 10px 18px;
  text-decoration: none;
  color: var(--muted);
  font-weight: 600;
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: 6px 6px 0 0;
  background: #eceff2;
}

.tab.active {
  color: var(--blue-dark);
  background: #fff;
  border-color: var(--border);
}

.panel {
  display: none;
  background: #fff;
  border: 1px solid var(--border);
  border-top: none;
  padding: 24px;
  border-radius: 0 0 8px 8px;
}

.panel.visible {
  display: block;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
}

.input-row {
  display: flex;
  gap: 8px;
}

input[type="text"], input[type="file"], textarea {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.95rem;
  font-family: inherit;
}

textarea {
  width: 100%;
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 0.85rem;
  resize: vertical;
}

button {
  padding: 10px 20px;
  background: var(--blue);
  color: #fff;
  border: none;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
}

button:hover {
  background: var(--blue-dark);
}

.hint {
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 10px;
}

.notice {
  margin: 20px 0 0;
  padding: 12px 16px;
  border-radius: 6px;
  font-size: 0.9rem;
}

.notice-error {
  background: var(--red-bg);
  color: var(--red);
  border: 1px solid #f0c6c6;
}

.notice-info {
  background: #eaf2fb;
  color: var(--blue-dark);
  border: 1px solid #c7dcf0;
  margin: 0 0 20px;
}

main.wrap {
  padding-top: 24px;
  padding-bottom: 60px;
}

.back-link {
  display: inline-block;
  margin-bottom: 16px;
  color: var(--blue);
  text-decoration: none;
  font-size: 0.9rem;
}

.back-link:hover {
  text-decoration: underline;
}

.banner {
  padding: 16px 20px;
  border-radius: 8px;
  font-size: 1.05rem;
  margin-bottom: 12px;
}

.banner-pass {
  background: var(--green-bg);
  color: var(--green);
  border: 1px solid #c3e6c4;
}

.banner-fail {
  background: var(--red-bg);
  color: var(--red);
  border: 1px solid #f0c6c6;
}

.checked-doc {
  color: var(--muted);
  font-size: 0.85rem;
  margin: 0 0 20px;
}

.messages {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.message {
  background: #fff;
  border: 1px solid var(--border);
  border-left: 4px solid var(--border);
  border-radius: 6px;
  padding: 14px 16px;
}

.message-error {
  border-left-color: var(--red);
}

.message-warning {
  border-left-color: var(--amber);
}

.message-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
  font-size: 0.85rem;
}

.badge {
  text-transform: uppercase;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 999px;
}

.badge-error {
  background: var(--red-bg);
  color: var(--red);
}

.badge-warning {
  background: var(--amber-bg);
  color: var(--amber);
}

.location {
  color: var(--muted);
}

.tag {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  background: #eceff2;
  color: var(--muted);
}

.tag-html {
  background: #eaf2fb;
  color: var(--blue-dark);
}

.tag-css {
  background: #f2eafb;
  color: #6a3fa0;
}

.tag-js {
  background: #fff6e0;
  color: var(--amber);
}

.rule {
  color: var(--muted);
  font-family: Consolas, monospace;
  font-size: 0.78rem;
}

.message-text {
  margin: 0 0 8px;
}

.context {
  background: #f5f7f9;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px 10px;
  overflow-x: auto;
  font-size: 0.85rem;
  margin: 0;
}

.caret {
  color: var(--red);
  font-weight: 700;
  display: block;
}

.site-footer {
  color: var(--muted);
  font-size: 0.8rem;
  text-align: center;
  padding: 20px 0 40px;
}

.site-footer a {
  color: var(--blue);
}

.section-heading {
  font-size: 1.1rem;
  margin: 32px 0 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.external-resource {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  margin-bottom: 14px;
}

.external-resource h3 {
  margin: 0 0 10px;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
}

.external-resource code {
  font-size: 0.85rem;
  word-break: break-all;
}

.ext-status {
  margin-left: auto;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 999px;
  text-transform: uppercase;
}

.ext-status-ok {
  background: var(--green-bg);
  color: var(--green);
}

.ext-status-skipped {
  background: #eceff2;
  color: var(--muted);
}

.ext-status-error {
  background: var(--red-bg);
  color: var(--red);
}