:root {
  --bg: #f8f9fa;
  --card-bg: #fff;
  --text: #212529;
  --text-secondary: #6c757d;
  --border: #dee2e6;
  --primary: #4361ee;
  --primary-hover: #3a56d4;
  --code-bg: #f1f3f5;
  --btn-secondary-bg: #e9ecef;
  --btn-secondary-text: #495057;
  --btn-secondary-hover: #dee2e6;
  --header-color: #1a1a2e;
  --footer-color: #adb5bd;
  --shadow: rgba(0,0,0,0.08);
  --shadow-hover: rgba(0,0,0,0.1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1a2e;
    --card-bg: #16213e;
    --text: #e0e0e0;
    --text-secondary: #a0a0b0;
    --border: #2a2a4a;
    --primary: #6c8aff;
    --primary-hover: #5a78ee;
    --code-bg: #0f3460;
    --btn-secondary-bg: #2a2a4a;
    --btn-secondary-text: #c0c0d0;
    --btn-secondary-hover: #3a3a5a;
    --header-color: #e0e0e0;
    --footer-color: #606080;
    --shadow: rgba(0,0,0,0.3);
    --shadow-hover: rgba(0,0,0,0.5);
  }
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.header {
  text-align: center;
  padding: 48px 16px 32px;
}

.header h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--header-color);
}

.subtitle {
  margin-top: 8px;
  color: var(--text-secondary);
  font-size: 1rem;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 16px;
  flex: 1;
  width: 100%;
}

.search-wrap {
  display: flex;
  justify-content: center;
  margin-bottom: 32px;
}

.search-wrap-inner {
  position: relative;
  width: 100%;
  max-width: 400px;
}

.search-input {
  width: 100%;
  padding: 12px 16px 12px 40px;
  border: 1px solid var(--border);
  border-radius: 24px;
  font-size: 0.95rem;
  background: var(--card-bg);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.search-input::placeholder {
  color: var(--text-secondary);
}

.search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.15);
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  font-size: 0.9rem;
  pointer-events: none;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.tool-card {
  display: block;
  background: var(--card-bg);
  border-radius: 12px;
  padding: 28px 20px;
  text-decoration: none;
  color: inherit;
  box-shadow: 0 1px 3px var(--shadow);
  transition: transform 0.15s, box-shadow 0.15s;
}

.tool-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px var(--shadow-hover);
}

.tool-card.hidden {
  display: none;
}

.tool-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.tool-name {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--header-color);
}

.tool-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.no-results {
  grid-column: 1 / -1;
  text-align: center;
  padding: 40px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.footer {
  text-align: center;
  padding: 32px 16px;
  color: var(--footer-color);
  font-size: 0.85rem;
}

/* 工具页 */
.tool-page {
  max-width: 900px;
  margin: 0 auto;
  padding: 32px 16px;
  flex: 1;
}

.tool-page h1 {
  font-size: 1.5rem;
  margin-bottom: 24px;
  color: var(--header-color);
}

.tool-workspace {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.tool-panel {
  display: flex;
  flex-direction: column;
}

.tool-panel label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.tool-panel textarea {
  flex: 1;
  min-height: 360px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  font-size: 0.85rem;
  resize: vertical;
  outline: none;
  background: var(--card-bg);
  color: var(--text);
  transition: border-color 0.15s;
}

.tool-panel textarea:focus {
  border-color: var(--primary);
}

.tool-panel pre {
  flex: 1;
  min-height: 360px;
  padding: 12px;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  font-size: 0.85rem;
  white-space: pre-wrap;
  word-break: break-all;
  overflow-y: auto;
  margin: 0;
  color: var(--text);
}

.error-msg {
  color: #e03131;
  font-size: 0.85rem;
  margin-top: 8px;
  display: none;
}

.tool-actions {
  grid-column: 1 / -1;
  display: flex;
  gap: 12px;
  align-items: center;
}

.btn {
  padding: 10px 24px;
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

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

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

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

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

.back-link {
  display: inline-block;
  margin-top: 24px;
  color: var(--primary);
  text-decoration: none;
  font-size: 0.9rem;
}

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

.doc-formatter-form {
  max-width: 640px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group > label:first-child {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}

.form-group input[type="text"] {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  background: var(--card-bg);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
}

.form-group input[type="text"]:focus {
  border-color: var(--primary);
}

.file-input-wrap input[type="file"] {
  width: 100%;
}

.preset-btns {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn-sm {
  padding: 6px 16px;
  font-size: 0.85rem;
  border-radius: 6px;
}

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

.form-group-half {
  flex: 1;
  min-width: 0;
}

.form-group select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.9rem;
  background: var(--card-bg);
  color: var(--text);
  outline: none;
  cursor: pointer;
  transition: border-color 0.15s;
  appearance: auto;
}

.form-group select:focus {
  border-color: var(--primary);
}

input[type="text"], input[type="file"] {
  color: var(--text);
}

input[type="file"]::file-selector-button {
  background: var(--btn-secondary-bg);
  color: var(--btn-secondary-text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 14px;
  cursor: pointer;
  font-family: inherit;
}

.template-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.tab-btn {
  padding: 6px 18px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--card-bg);
  color: var(--text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.15s;
}

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

.template-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.tpl-card {
  cursor: pointer;
  border-radius: 10px;
  overflow: hidden;
  border: 2px solid var(--border);
  transition: border-color 0.15s;
  display: block;
}

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

.tpl-card input[type="radio"] {
  display: none;
}

.tpl-card input[type="radio"]:checked + .tpl-preview {
  box-shadow: inset 0 0 0 3px var(--primary);
}

.tpl-preview {
  padding: 14px 16px;
  position: relative;
}

.tpl-bar {
  height: 3px;
  width: 30px;
  border-radius: 2px;
  margin-bottom: 10px;
}

.tpl-title-sample {
  font-size: 1rem;
  margin-bottom: 4px;
}

.tpl-body-sample {
  font-size: 0.75rem;
  opacity: 0.7;
}

.tpl-info {
  padding: 10px 14px;
  background: var(--card-bg);
  border-top: 1px solid var(--border);
}

.tpl-name {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}

.tpl-desc {
  display: block;
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.9rem;
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  background: var(--card-bg);
  color: var(--text);
  outline: none;
  resize: vertical;
  transition: border-color 0.15s;
  line-height: 1.7;
}

.form-group textarea:focus {
  border-color: var(--primary);
}

@media (max-width: 768px) {
  .tool-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .tool-workspace {
    grid-template-columns: 1fr;
  }
  .tool-panel textarea, .tool-panel pre {
    min-height: 200px;
  }
  .search-input {
    max-width: 100%;
  }
}

@media (max-width: 480px) {
  .tool-grid {
    grid-template-columns: 1fr;
  }
  .header h1 {
    font-size: 1.5rem;
  }
}