/* ===== CSS Variables & Theme ===== */
:root {
  --bg: #f5f7fa;
  --bg-card: #ffffff;
  --bg-input: #ffffff;
  --bg-code: #f0f2f5;
  --text: #1a1a2e;
  --text-secondary: #6b7280;
  --text-label: #374151;
  --border: #e2e5e9;
  --border-focus: #4f6df5;
  --primary: #4f6df5;
  --primary-hover: #3b5de7;
  --primary-bg: #eef0fd;
  --warn: #ef4444;
  --warn-bg: #fef2f2;
  --success: #10b981;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --radius: 8px;
  --radius-lg: 12px;
  --transition: 0.2s ease;
  --google-blue: #1a0dab;
  --google-green: #006621;
  --google-gray: #545454;
  --twitter-blue: #1d9bf0;
  --twitter-bg: #16181c;
  --twitter-border: #2f3336;
  --twitter-text: #e7e9ea;
  --twitter-gray: #71767b;
  --fb-blue: #1877f2;
}

[data-theme="dark"] {
  --bg: #0f1117;
  --bg-card: #1a1d27;
  --bg-input: #252830;
  --bg-code: #252830;
  --text: #e7e9ea;
  --text-secondary: #9ca3af;
  --text-label: #d1d5db;
  --border: #374151;
  --border-focus: #6366f1;
  --primary: #6366f1;
  --primary-hover: #818cf8;
  --primary-bg: #1e1b4b;
  --warn: #f87171;
  --warn-bg: #450a0a;
  --success: #34d399;
  --shadow: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.4);
  --google-blue: #8ab4f8;
  --google-green: #81c995;
  --google-gray: #9aa0a6;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
}

/* ===== Header ===== */
.header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  white-space: nowrap;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  color: var(--text);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.btn-primary:hover {
  background: var(--primary-hover);
  color: #fff;
}

.btn-secondary {
  background: var(--bg-input);
}

.btn-icon {
  width: 38px;
  height: 38px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  border-radius: 50%;
}

.btn-small {
  padding: 4px 10px;
  font-size: 0.75rem;
}

.preset-select {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-input);
  color: var(--text);
  font-size: 0.875rem;
  cursor: pointer;
}

/* ===== Main ===== */
.main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px;
}

/* ===== Tabs ===== */
.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 20px;
  overflow-x: auto;
  padding-bottom: 4px;
  -webkit-overflow-scrolling: touch;
}

.tab {
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius) var(--radius) 0 0;
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 0.875rem;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition);
  border-bottom: 2px solid transparent;
}

.tab:hover {
  color: var(--primary);
}

.tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  font-weight: 600;
}

/* ===== Tab Content ===== */
.tab-content {
  display: none;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0 var(--radius) var(--radius) var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.tab-content.active {
  display: block;
}

/* ===== Form ===== */
.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-label);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-input);
  color: var(--text);
  font-size: 0.9rem;
  font-family: inherit;
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--primary-bg);
}

.form-row {
  display: flex;
  gap: 16px;
}

.form-group.half {
  flex: 1;
}

.char-count {
  font-weight: 400;
  color: var(--text-secondary);
  font-size: 0.8rem;
}

.warn {
  color: var(--warn);
  font-size: 0.8rem;
  font-weight: 400;
  margin-left: 8px;
}

.warn.show {
  display: inline;
}

/* ===== Image Preview ===== */
.image-preview {
  margin-top: 8px;
  max-width: 100%;
  border-radius: var(--radius);
  overflow: hidden;
  display: none;
}

.image-preview img {
  max-width: 100%;
  max-height: 200px;
  object-fit: cover;
  display: block;
  border-radius: var(--radius);
}

.image-preview.visible {
  display: block;
}

/* ===== Code Output ===== */
.code-output,
.code-preview {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  font-size: 0.8rem;
  line-height: 1.7;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
  color: var(--text);
  max-height: 500px;
  overflow-y: auto;
}

.code-output-small {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  font-size: 0.78rem;
  line-height: 1.6;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
  color: var(--text);
  max-height: 250px;
  overflow-y: auto;
}

.output-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.output-header h3 {
  font-size: 1rem;
}

.output-sections {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.output-section {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
}

.output-section h4 {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  font-size: 0.875rem;
  color: var(--text-label);
}

/* ===== Preview Cards ===== */
.section-title {
  font-size: 1rem;
  margin-bottom: 12px;
  margin-top: 24px;
}

.section-title:first-child {
  margin-top: 0;
}

.preview-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 24px;
}

/* Google Preview */
.google-preview {
  padding: 16px 20px;
  background: var(--bg-card);
}

.google-preview .gp-url {
  font-size: 0.8rem;
  color: var(--google-green);
  margin-bottom: 4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.google-preview .gp-title {
  font-size: 1.15rem;
  color: var(--google-blue);
  cursor: pointer;
  margin-bottom: 4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.google-preview .gp-title:hover {
  text-decoration: underline;
}

.google-preview .gp-desc {
  font-size: 0.85rem;
  color: var(--google-gray);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Twitter Preview */
.twitter-preview {
  background: var(--twitter-bg);
  color: var(--twitter-text);
  border-color: var(--twitter-border);
}

.twitter-preview .tp-card {
  border: 1px solid var(--twitter-border);
  border-radius: 12px;
  overflow: hidden;
}

.twitter-preview .tp-image {
  width: 100%;
  aspect-ratio: 16/9;
  background: #2a2d35;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--twitter-gray);
  font-size: 0.85rem;
  overflow: hidden;
}

.twitter-preview .tp-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.twitter-preview .tp-body {
  padding: 12px;
}

.twitter-preview .tp-title {
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.twitter-preview .tp-desc {
  color: var(--twitter-gray);
  font-size: 0.85rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.twitter-preview .tp-domain {
  color: var(--twitter-gray);
  font-size: 0.78rem;
  margin-top: 4px;
}

/* Facebook Preview */
.facebook-preview {
  background: var(--bg-card);
}

.facebook-preview .fp-card {
  border: 1px solid var(--border);
  border-radius: 0;
  overflow: hidden;
}

.facebook-preview .fp-image {
  width: 100%;
  aspect-ratio: 1.91/1;
  background: var(--bg-code);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
  overflow: hidden;
}

.facebook-preview .fp-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.facebook-preview .fp-body {
  padding: 12px 16px;
  background: var(--bg-card);
  border-top: none;
}

.facebook-preview .fp-domain {
  font-size: 0.72rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.facebook-preview .fp-title {
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.facebook-preview .fp-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ===== Modal ===== */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.5);
  padding: 20px;
}

.modal.hidden {
  display: none;
}

.modal-content {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 640px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

.modal-header h3 {
  font-size: 1rem;
}

.modal-body {
  padding: 20px;
}

.modal-hint {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.modal-body textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-input);
  color: var(--text);
  font-family: "SF Mono", monospace;
  font-size: 0.8rem;
  resize: vertical;
}

.modal-body textarea:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--primary-bg);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 16px 20px;
  border-top: 1px solid var(--border);
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--primary);
  color: #fff;
  padding: 10px 24px;
  border-radius: var(--radius);
  font-size: 0.875rem;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transition: all 0.3s ease;
  z-index: 2000;
  pointer-events: none;
}

.toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ===== JSON-LD Dynamic Fields ===== */
.jsonld-field-group {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 16px;
  background: var(--bg-code);
}

.jsonld-field-group h4 {
  font-size: 0.875rem;
  margin-bottom: 10px;
  color: var(--primary);
}

.jsonld-faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  margin-bottom: 10px;
  background: var(--bg-input);
  position: relative;
}

.jsonld-faq-item .btn-remove {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--warn);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 24px;
  height: 24px;
  cursor: pointer;
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ===== Footer ===== */
.footer {
  text-align: center;
  padding: 24px 20px;
  color: var(--text-secondary);
  font-size: 0.8rem;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
  .form-row {
    flex-direction: column;
    gap: 0;
  }
  .tab {
    padding: 8px 12px;
    font-size: 0.8rem;
  }
  .tab-content {
    padding: 16px;
  }
}