:root {
  --bg: #f4f6fb;
  --card-bg: #ffffff;
  --border: #e3e7ef;
  --text: #1b1e28;
  --muted: #6b7280;
  --accent: #4f6df5;
  --accent-text: #ffffff;
  --field-bg: #f8f9fc;
  --ok-bg: #e3f9ed;
  --ok-text: #1f9d55;
  --bad-bg: #fdecec;
  --bad-text: #d64545;
  --tip-bg: #eef4ff;
  --tip-border: #cfe0ff;
  --tip-text: #2c4a9e;
  --code-bg: #eef0f5;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  justify-content: center;
  padding: 28px 14px 60px;
}

.app {
  width: 100%;
  max-width: 640px;
}

header h1 {
  font-size: 24px;
  margin: 0 0 4px;
}

header p.subtitle {
  color: var(--muted);
  font-size: 14px;
  margin: 0 0 20px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  box-shadow: 0 1px 2px rgba(16, 24, 40, 0.04);
}

label.field-label {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 6px;
  font-weight: 600;
}

textarea {
  width: 100%;
  min-height: 170px;
  resize: vertical;
  background: var(--field-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  padding: 12px;
  font-size: 14px;
  font-family: inherit;
}

textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.counter-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 10px;
  font-size: 12px;
  color: var(--muted);
  flex-wrap: wrap;
  gap: 8px;
}

.counter-row label {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.button-row {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}

button,
input[type="submit"] {
  flex: 1;
  padding: 12px;
  border: none;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
}

button:hover,
input[type="submit"]:hover {
  opacity: 0.92;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-text);
}

.btn-secondary {
  background: #eef0f5;
  color: var(--text);
}

.tip-box {
  display: flex;
  gap: 12px;
  background: var(--tip-bg);
  border: 1px solid var(--tip-border);
  color: var(--tip-text);
  padding: 16px 18px;
  border-radius: 12px;
  font-size: 14px;
  line-height: 1.55;
  margin: 20px 0;
}

.tip-box .tip-icon {
  font-size: 18px;
  flex-shrink: 0;
}

.tip-box p {
  margin: 0;
}

.summary {
  margin: 4px 0 14px;
  font-size: 13px;
  color: var(--muted);
}

.summary.error {
  color: var(--bad-text);
}

.results {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.result-item {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
}

.result-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.result-num {
  color: #b0b4bf;
  font-size: 13px;
  font-weight: 600;
  min-width: 28px;
}

.result-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  word-break: break-all;
}

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

.badge {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 6px;
  white-space: nowrap;
}

.badge.valid {
  background: var(--ok-bg);
  color: var(--ok-text);
}

.badge.invalid {
  background: var(--bad-bg);
  color: var(--bad-text);
}

.result-meta {
  margin-top: 8px;
  font-size: 12px;
  color: var(--muted);
}

.result-meta code {
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 12px;
}

.result-actions {
  margin-top: 10px;
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.icon-btn {
  background: #eef0f5;
  border: none;
  border-radius: 8px;
  width: 38px;
  flex: none;
  font-size: 15px;
  cursor: pointer;
  padding: 8px 0;
}

.btn-open {
  background: #eef0f5;
  color: var(--text);
  text-decoration: none;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  flex: none;
}

#copyAllBtn {
  margin-top: 16px;
  width: 100%;
}

footer {
  margin-top: 26px;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.6;
  text-align: center;
}