/* XML 格式化工具 - 开发者风 UI
   - 目标：极简、偏编辑器/控制台感觉，弱化“模板站”和 AI 痕迹
   - 设计语言：中性色 + 细边框 + 小半径 + 清晰层级
*/

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

:root {
  --bg: #f3f4f6;
  --bg-elevated: #ffffff;
  --bg-soft: #f9fafb;
  --panel: #ffffff;
  --border-subtle: rgba(209, 213, 219, 0.9);
  --border-strong: rgba(148, 163, 184, 1);
  --text: #111827;
  --text-muted: #6b7280;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.08);
  --danger: #dc2626;
  --shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.08);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --transition-fast: 0.16s ease-out;
}

html,
body {
  height: 100%;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1180px;
  width: 100%;
  margin: 32px auto 40px;
  padding: 0 16px 32px;
  background: var(--panel);
  border-radius: 22px;
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-soft);
}

/* Header */

.header {
  padding: 20px 20px 12px;
  border-bottom: 1px solid rgba(209, 213, 219, 0.9);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo-icon {
  width: 40px;
  height: 40px;
  padding: 6px;
  border-radius: 12px;
  background: radial-gradient(circle at 20% 0%, rgba(59, 130, 246, 0.15), transparent 55%),
    radial-gradient(circle at 80% 120%, rgba(56, 189, 248, 0.18), transparent 55%);
  border: 1px solid rgba(191, 219, 254, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #e5f0ff;
}

.logo-icon img,
.logo-icon svg {
  width: 100%;
  height: 100%;
  display: block;
}

.logo-text h1 {
  font-size: 20px;
  letter-spacing: 0.04em;
}

.logo-tagline {
  font-size: 12px;
  color: var(--text-muted);
}

.subtitle {
  font-size: 12px;
  color: var(--text-muted);
}

.header-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
  flex-wrap: wrap;
}

.badge {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid rgba(209, 213, 219, 0.9);
  background: #f9fafb;
  color: #6b7280;
  font-family: "SF Mono", ui-monospace, Menlo, Monaco, Consolas, "Courier New", monospace;
}

.badge-solid {
  border-color: rgba(37, 99, 235, 0.9);
  background: #eff6ff;
  color: #1d4ed8;
}

/* Toolbar */

.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 20px 14px;
  gap: 12px;
  border-bottom: 1px solid rgba(229, 231, 235, 0.9);
  background: #f9fafb;
}

.toolbar-left {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.toolbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-muted);
}

.indent-control select {
  appearance: none;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background: #ffffff;
  color: var(--text);
  padding: 4px 8px;
  font-size: 12px;
}

button {
  font-family: inherit;
}

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  font-size: 13px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background: #ffffff;
  color: var(--text);
  cursor: pointer;
  transition: border-color var(--transition-fast), background var(--transition-fast),
    box-shadow 0.12s ease-out;
}

.btn-primary {
  border-color: rgba(37, 99, 235, 0.9);
  background: #2563eb;
  color: #f9fafb;
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.25);
}

.btn-secondary {
  border-color: rgba(56, 189, 248, 0.6);
  background: #e0f2fe;
  color: var(--accent);
}

.btn-outline {
  background: #ffffff;
}

.btn:hover {
  border-color: var(--border-strong);
  box-shadow: 0 2px 6px rgba(148, 163, 184, 0.4);
}

.btn-primary:hover {
  border-color: rgba(191, 219, 254, 0.9);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.35);
}

.btn:active {
  box-shadow: none;
}

.btn-icon {
  width: 15px;
  height: 15px;
}

.btn-small {
  padding: 3px 9px;
  font-size: 11px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.45);
  background: #f9fafb;
  color: var(--text-muted);
  cursor: pointer;
  transition: border-color var(--transition-fast), background var(--transition-fast),
    color var(--transition-fast);
}

.btn-small:hover {
  border-color: rgba(148, 163, 184, 0.8);
  color: var(--text);
}

/* Main editors */

.content {
  display: grid;
  grid-template-columns: 1fr 12px 1fr;
  align-items: stretch;
  padding: 18px 20px 20px;
  gap: 12px;
}

.divider {
  width: 1px;
  background: linear-gradient(
    to bottom,
    transparent 0,
    rgba(148, 163, 184, 0.35) 18%,
    rgba(148, 163, 184, 0.4) 50%,
    rgba(148, 163, 184, 0.35) 82%,
    transparent 100%
  );
  border-radius: 999px;
}

.editor-panel {
  display: flex;
  flex-direction: column;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  background: #ffffff;
  overflow: hidden;
  min-width: 0;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px 9px;
  border-bottom: 1px solid rgba(229, 231, 235, 0.9);
  background: #f9fafb;
}

.panel-header h3 {
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(226, 232, 240, 0.96);
}

.header-buttons {
  display: flex;
  align-items: center;
  gap: 6px;
}

.editor-wrapper {
  display: grid;
  grid-template-columns: 52px 1fr;
  min-height: 360px;
  max-height: 520px;
  background: var(--bg-soft);
}

.line-numbers {
  padding: 10px 8px;
  border-right: 1px solid rgba(30, 64, 175, 0.3);
  background: #f3f4f6;
  color: #6b7280;
  font-size: 13px;
  line-height: 1.55;
  font-family: "JetBrains Mono", "SF Mono", ui-monospace, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  white-space: pre; /* 保留换行，让 1,2,3 垂直对齐 */
  text-align: right;
  user-select: none;
}

.editor {
  width: 100%;
  border: none;
  outline: none;
  resize: none;
  padding: 10px 12px;
  font-family: "JetBrains Mono", "SF Mono", ui-monospace, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  font-size: 13px;
  line-height: 1.55;
  color: var(--text);
  background: #ffffff;
  white-space: pre;
  overflow: auto;
}

.editor::placeholder {
  color: rgba(148, 163, 184, 0.7);
}

.output-editor {
  white-space: pre-wrap;
}

.panel-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px 9px;
  border-top: 1px dashed rgba(148, 163, 184, 0.3);
  font-size: 11px;
  color: var(--text-muted);
}

.stats {
  font-variant-numeric: tabular-nums;
}

.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 8px;
  border-radius: 999px;
  background: #ecfdf3;
  border: 1px solid rgba(22, 163, 74, 0.4);
  font-size: 11px;
  color: #166534;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: #16a34a;
  box-shadow: none;
}

.status-text {
  letter-spacing: 0.02em;
  text-transform: none;
}

/* Intro section */

.intro-section {
  margin: 10px 20px 4px;
  padding: 18px 16px 20px;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(229, 231, 235, 0.9);
  background: #ffffff;
}

.intro-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px dashed rgba(148, 163, 184, 0.35);
}

.intro-icon {
  width: 22px;
  height: 22px;
  color: rgba(148, 163, 184, 0.9);
}

.intro-header h2 {
  font-size: 15px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(226, 232, 240, 0.96);
}

.intro-content {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 14px;
}

.intro-card {
  border-radius: var(--radius-md);
  border: 1px solid rgba(229, 231, 235, 0.9);
  padding: 10px 12px;
  background: #ffffff;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
  transition: border-color 0.15s ease-out, box-shadow 0.15s ease-out, transform 0.1s ease-out;
}

.highlight-card {
  /* 与普通 intro-card 保持一致，不再单独高亮 */
  background: #ffffff;
  border-color: rgba(229, 231, 235, 0.9);
  box-shadow: none;
}

.intro-card:hover {
  border-color: rgba(148, 163, 184, 1);
  box-shadow: 0 4px 14px rgba(148, 163, 184, 0.35);
  transform: translateY(-1px);
}

.intro-card h3 {
  font-size: 13px;
  margin-bottom: 6px;
  color: #111827;
}

.intro-card ul {
  list-style: none;
  display: grid;
  gap: 3px;
  padding-left: 0;
}

.intro-card li {
  font-size: 12px;
  color: var(--text-muted);
}

.comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 2px;
}

.comparison-item strong {
  font-size: 12px;
}

.intro-card p {
  font-size: 12px;
  color: var(--text-muted);
}

/* SEO content (hidden block) */

.seo-content {
  font-size: 13px;
}

/* Toast */

.toast {
  position: fixed;
  top: 20px;
  right: 20px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid rgba(34, 197, 94, 0.5);
  background: rgba(21, 128, 61, 0.9);
  color: #ecfdf5;
  font-size: 12px;
  box-shadow: 0 14px 45px rgba(22, 163, 74, 0.6);
}

.toast-icon {
  width: 16px;
  height: 16px;
}

/* Footer */

.footer {
  margin: 12px 20px 0;
  padding: 10px 14px 12px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(229, 231, 235, 0.9);
  background: #ffffff;
  font-size: 11px;
  color: var(--text-muted);
}

.footer p {
  text-align: center;
  margin-bottom: 8px;
}

.footer-links {
  margin-top: 6px;
  padding-top: 8px;
  border-top: 1px solid rgba(148, 163, 184, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.footer-link {
  color: #4b5563;
  text-decoration: none;
  padding: 2px 6px;
  border-radius: 4px;
  transition: color 0.2s ease, background 0.2s ease, transform 0.1s ease;
}

.footer-link:hover {
  color: #111827;
  background: rgba(37, 99, 235, 0.08);
  transform: translateY(-1px);
}

.footer-separator {
  color: rgba(148, 163, 184, 0.7);
  user-select: none;
}

/* Scrollbars */

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: #e5e7eb;
}

::-webkit-scrollbar-thumb {
  background: rgba(156, 163, 175, 0.9);
  border-radius: 999px;
  border: 2px solid #020617;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(107, 114, 128, 1);
}

/* Responsive */

@media (max-width: 1024px) {
  .content {
    grid-template-columns: 1fr;
  }

  .divider {
    display: none;
  }

  .intro-content {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .container {
    margin-top: 16px;
    padding-inline: 12px;
  }

  .header {
    padding-inline: 14px;
  }

  .toolbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .content {
    padding-inline: 14px;
  }

  .editor-wrapper {
    grid-template-columns: 42px 1fr;
    min-height: 260px;
  }

  .intro-section {
    margin-inline: 14px;
  }

  .intro-content {
    grid-template-columns: 1fr;
  }
}