/* ============================================
   ToolBox — Main Stylesheet
   Design: Warm, balanced, unique personality
   Fonts: Outfit (display) + IBM Plex Mono (labels)
   Background: #FAFAF8 (warm off-white)
   ============================================ */

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

:root {
  --bg: #FAFAF8;
  --bg-card: #FFFFFF;
  --text-primary: #1a1a1a;
  --text-secondary: #555;
  --text-muted: #888;
  --text-faint: #aaa;
  --border: #e8e6e1;
  --border-light: #f0eee9;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.08);
  --radius: 14px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --font-display: 'Outfit', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
  --max-width: 1200px;
  --accent: #1a1a1a;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-display);
  font-weight: 400;
  color: var(--text-primary);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; font-family: inherit; }
input, textarea, select { font-family: inherit; font-size: inherit; }

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 250, 248, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.logo-icon { font-size: 1.4rem; }

.header-search { flex: 1; max-width: 400px; }

.search-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.875rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.search-trigger:hover {
  border-color: #ccc;
  box-shadow: var(--shadow-sm);
}

.search-trigger kbd {
  margin-left: auto;
  padding: 2px 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}

.header-nav {
  display: flex;
  gap: 20px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.header-nav a:hover { color: var(--text-primary); }

/* --- Breadcrumb --- */
.breadcrumb {
  border-bottom: 1px solid var(--border-light);
  background: var(--bg);
}

.breadcrumb-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 10px 24px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.breadcrumb a:hover { color: var(--text-primary); }
.breadcrumb-sep { opacity: 0.4; }
.breadcrumb-current { color: var(--text-secondary); font-weight: 500; }

/* --- Main Content --- */
.main-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 80px;
}

/* --- Hero (Homepage) --- */
.hero {
  text-align: center;
  padding: 80px 0 60px;
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.hero-accent {
  background: linear-gradient(135deg, #E8590C, #D6336C, #6741D9);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  margin-top: 16px;
  font-size: 1.15rem;
  color: var(--text-secondary);
  font-weight: 400;
}

.hero-search {
  margin-top: 32px;
  display: flex;
  justify-content: center;
}

.hero-search-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: 50px;
  font-size: 1rem;
  color: var(--text-muted);
  min-width: 360px;
  transition: all 0.25s;
  box-shadow: var(--shadow-sm);
}

.hero-search-btn:hover {
  border-color: #bbb;
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

/* --- Section Titles --- */
.section-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 24px;
  letter-spacing: -0.01em;
}

/* --- Categories Grid --- */
.categories-section { padding-top: 10px; }

.categories-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.category-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 22px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: all 0.25s;
}

.category-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.category-card-icon { font-size: 2rem; flex-shrink: 0; line-height: 1; }

.category-card-body h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.category-card-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.45;
  margin-bottom: 8px;
}

.category-card-count {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  font-weight: 500;
  padding: 2px 8px;
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  border-radius: 20px;
}

/* --- Popular Tools Chips --- */
.popular-section { padding-top: 48px; }

.popular-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tool-chip {
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.2s;
}

.tool-chip:hover {
  border-color: #999;
  background: var(--text-primary);
  color: #fff;
}

/* --- Page Header (Category/Subcategory) --- */
.page-header {
  padding: 48px 0 32px;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 32px;
}

.page-header-icon { font-size: 2.5rem; margin-bottom: 12px; }

.page-header h1 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

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

.page-header-count {
  display: inline-block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  padding: 3px 10px;
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  border-radius: 20px;
  font-weight: 500;
}

/* --- Subcategories Grid --- */
.subcategories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.subcategory-card {
  padding: 22px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: all 0.25s;
}

.subcategory-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.subcategory-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.subcat-count {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}

.subcat-desc {
  margin-top: 8px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.subcat-preview {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.subcat-tool-tag {
  padding: 3px 10px;
  font-size: 0.72rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-secondary);
}

.subcat-tool-more {
  padding: 3px 10px;
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* --- Tools Grid --- */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
}

.tool-card {
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: all 0.25s;
}

.tool-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.tool-card-name {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.tool-card-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.tool-card-template {
  display: inline-block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-faint);
  padding: 2px 7px;
  border: 1px solid var(--border);
  border-radius: 4px;
}

/* --- Tool Page --- */
.tool-page { padding-top: 32px; }

.tool-header {
  margin-bottom: 28px;
}

.tool-header h1 {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.tool-header-desc {
  margin-top: 6px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Tool Interface Container */
.tool-interface {
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  margin-bottom: 40px;
}

/* --- Unit Converter --- */
.converter-row {
  display: flex;
  align-items: flex-end;
  gap: 16px;
}

.converter-field { flex: 1; }
.converter-field label {
  display: block;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.converter-input {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1.4rem;
  font-weight: 600;
  font-family: var(--font-mono);
  background: var(--bg);
  outline: none;
  transition: border-color 0.2s;
}

.converter-input:focus { border-color: var(--accent); }
.converter-output { color: var(--accent); background: color-mix(in srgb, var(--accent) 4%, var(--bg)); }

.converter-swap {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1.5px solid var(--border);
  border-radius: 50%;
  background: var(--bg-card);
  font-size: 1.2rem;
  color: var(--text-secondary);
  transition: all 0.2s;
  margin-bottom: 2px;
}

.converter-swap:hover {
  background: var(--text-primary);
  color: #fff;
  border-color: var(--text-primary);
}

.converter-formula {
  margin-top: 16px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.converter-formula code {
  font-family: var(--font-mono);
  background: var(--bg);
  padding: 2px 8px;
  border-radius: 4px;
  margin-left: 4px;
}

/* --- Calculator --- */
.calc-inputs {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.calc-field label {
  display: block;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.calc-field input, .calc-field select {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  background: var(--bg);
  outline: none;
  transition: border-color 0.2s;
}

.calc-field input:focus, .calc-field select:focus { border-color: var(--accent); }

.calc-result {
  margin-top: 20px;
  padding: 16px 20px;
  background: color-mix(in srgb, var(--accent) 5%, var(--bg));
  border: 1px solid color-mix(in srgb, var(--accent) 20%, transparent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 10px;
}

.calc-result-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.calc-result-value {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
}

.calc-copy {
  margin-left: auto;
  background: none;
  border: none;
  font-size: 1.1rem;
  opacity: 0.5;
  transition: opacity 0.2s;
}

.calc-copy:hover { opacity: 1; }

/* --- Text Tool --- */
.text-tool-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.text-tool-field label {
  display: block;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.text-tool-textarea {
  width: 100%;
  padding: 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  line-height: 1.6;
  resize: vertical;
  background: var(--bg);
  outline: none;
  transition: border-color 0.2s;
}

.text-tool-textarea:focus { border-color: var(--accent); }
.text-tool-output { font-family: var(--font-mono); font-size: 0.85rem; }

.text-tool-meta {
  margin-top: 6px;
  display: flex;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}

.text-tool-actions {
  margin-top: 8px;
  display: flex;
  gap: 8px;
}

/* --- File Converter --- */
.file-drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 48px 24px;
  text-align: center;
  transition: all 0.3s;
  cursor: pointer;
}

.file-drop-zone:hover, .file-drop-zone.drag-over {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 3%, transparent);
}

.drop-zone-icon { color: var(--text-muted); margin-bottom: 12px; }
.drop-zone-text { font-size: 1rem; font-weight: 500; color: var(--text-secondary); }
.drop-zone-hint { margin-top: 6px; font-size: 0.85rem; color: var(--text-muted); }
.drop-zone-browse {
  background: none;
  border: none;
  color: var(--accent);
  font-weight: 600;
  text-decoration: underline;
}
.drop-zone-formats { margin-top: 10px; font-size: 0.75rem; color: var(--text-faint); }
.file-input-hidden { display: none; }

.file-selected {
  margin-top: 16px;
  padding: 16px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 12px;
}

.file-name { font-weight: 600; font-size: 0.9rem; }
.file-size { font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-muted); }

.progress-bar {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
  margin-top: 16px;
}

.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  width: 0%;
  transition: width 0.3s;
}

.file-result { margin-top: 16px; text-align: center; }
.result-success { color: #2B8A3E; font-weight: 600; margin-bottom: 12px; }

/* --- Code Tool --- */
.code-tool-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.code-tool-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.code-tool-header label { font-size: 0.82rem; font-weight: 500; color: var(--text-secondary); }

.code-textarea {
  width: 100%;
  padding: 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
  resize: vertical;
  background: #1a1a1a;
  color: #e0e0e0;
  outline: none;
  tab-size: 2;
}

.code-textarea:focus { border-color: var(--accent); }
.code-output { background: #111; }

.code-select {
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  font-size: 0.78rem;
  background: var(--bg);
}

.code-tool-actions {
  margin-top: 12px;
  display: flex;
  gap: 8px;
}

/* --- Reference --- */
.reference-search-input {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  background: var(--bg);
  outline: none;
  margin-bottom: 16px;
}

.reference-search-input:focus { border-color: var(--accent); }

.reference-table-wrap { overflow-x: auto; }

.reference-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.reference-table th {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 2px solid var(--border);
  font-weight: 600;
  font-size: 0.78rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.reference-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-light);
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.reference-table tr:hover { background: color-mix(in srgb, var(--accent) 3%, transparent); }

/* --- How To Section --- */
.tool-howto {
  margin-bottom: 40px;
}

.tool-howto h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.howto-steps {
  display: flex;
  gap: 20px;
}

.howto-step {
  flex: 1;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.howto-num {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  font-weight: 700;
  font-size: 0.85rem;
}

.howto-step p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* --- FAQ --- */
.tool-faq { margin-bottom: 40px; }
.tool-faq h2 { font-size: 1.2rem; font-weight: 700; margin-bottom: 16px; }

.faq-item {
  border-bottom: 1px solid var(--border-light);
}

.faq-item summary {
  padding: 14px 0;
  font-weight: 500;
  font-size: 0.92rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item summary::after { content: '+'; font-size: 1.2rem; color: var(--text-muted); }
.faq-item[open] summary::after { content: '−'; }

.faq-item p {
  padding: 0 0 14px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- Related Tools --- */
.related-tools { margin-bottom: 40px; }
.related-tools h2 { font-size: 1.2rem; font-weight: 700; margin-bottom: 16px; }

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}

.related-card {
  padding: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all 0.2s;
}

.related-card:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.related-card h4 { font-size: 0.88rem; font-weight: 600; }
.related-cat { font-size: 0.72rem; color: var(--text-muted); margin-top: 4px; display: block; }

/* --- Buttons --- */
.btn-primary {
  padding: 10px 22px;
  background: var(--text-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  transition: all 0.2s;
}

.btn-primary:hover { opacity: 0.85; transform: translateY(-1px); }

.btn-secondary {
  padding: 8px 16px;
  background: var(--bg);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.82rem;
  transition: all 0.2s;
}

.btn-secondary:hover { border-color: #999; color: var(--text-primary); }

.btn-small {
  padding: 4px 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.2s;
}

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

.btn-home {
  display: inline-block;
  margin-top: 20px;
  padding: 10px 22px;
  background: var(--text-primary);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

/* --- Search Overlay --- */
.search-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(4px);
  justify-content: center;
  padding-top: 15vh;
}

.search-overlay.active { display: flex; }

.search-modal {
  width: 560px;
  max-height: 420px;
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.search-modal-input {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-light);
}

.search-modal-input svg { color: var(--text-muted); flex-shrink: 0; }

.search-modal-input input {
  flex: 1;
  border: none;
  background: none;
  font-size: 1rem;
  outline: none;
  color: var(--text-primary);
}

.search-modal-input kbd {
  padding: 2px 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}

.search-results {
  overflow-y: auto;
  padding: 8px;
}

.search-result-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-xs);
  cursor: pointer;
  font-size: 0.9rem;
  transition: background 0.15s;
}

.search-result-item:hover, .search-result-item.active {
  background: var(--bg);
}

.search-result-name { font-weight: 500; }
.search-result-cat { font-size: 0.72rem; color: var(--text-muted); margin-left: auto; }

.search-empty {
  padding: 24px;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* --- Footer --- */
.site-footer {
  background: #1a1a1a;
  color: #ccc;
  padding: 48px 0 24px;
  margin-top: 0;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.footer-brand .logo-text { color: #fff; }
.footer-tagline { margin-top: 6px; font-size: 0.85rem; color: #888; }

.footer-categories {
  margin-top: 32px;
}

.footer-categories h4 {
  font-size: 0.82rem;
  font-weight: 600;
  color: #888;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 14px;
}

.footer-cat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 8px;
}

.footer-cat-grid a {
  font-size: 0.85rem;
  color: #aaa;
  transition: color 0.2s;
}

.footer-cat-grid a:hover { color: #fff; }

.footer-bottom {
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid #333;
  font-size: 0.78rem;
  color: #666;
}

/* --- Error Page --- */
.error-page {
  text-align: center;
  padding: 100px 0;
}

.error-page h1 {
  font-size: 5rem;
  font-weight: 800;
  color: var(--border);
}

.error-page p {
  margin-top: 10px;
  color: var(--text-secondary);
}

/* --- Generator --- */
.generator-options {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}

.generator-result {
  padding: 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  word-break: break-all;
  margin-bottom: 12px;
}

.generator-actions {
  display: flex;
  gap: 8px;
}

/* --- Image Tool --- */
.image-workspace {
  margin-top: 16px;
}

.image-preview {
  max-height: 400px;
  overflow: hidden;
  border-radius: var(--radius-sm);
  background: #f0f0f0;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.image-preview img {
  max-height: 400px;
  object-fit: contain;
}

.image-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
}

.image-actions {
  display: flex;
  gap: 8px;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .hero-title { font-size: 2.2rem; }
  .hero-search-btn { min-width: 0; width: 100%; }
  .categories-grid { grid-template-columns: 1fr; }
  .header-nav { display: none; }
  .converter-row { flex-direction: column; }
  .converter-swap { align-self: center; transform: rotate(90deg); }
  .text-tool-row { grid-template-columns: 1fr; }
  .code-tool-row { grid-template-columns: 1fr; }
  .howto-steps { flex-direction: column; }
  .tool-interface { padding: 20px; }
  .search-modal { width: 95vw; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 1.8rem; }
  .header-inner { padding: 0 16px; }
  .main-content { padding: 0 16px 60px; }
}

/* ========================
   SEO PAGES
   ======================== */
.seo-page { max-width: 800px; margin: 0 auto; }
.seo-hero { text-align: center; padding: 60px 0 40px; }
.seo-hero h1 { font-size: 2.4rem; font-weight: 800; margin-bottom: 12px; }
.seo-hero-sub { font-size: 1.15rem; color: var(--text-muted); max-width: 600px; margin: 0 auto; }
.seo-content { line-height: 1.75; }
.seo-content h2 { font-size: 1.5rem; font-weight: 700; margin: 40px 0 16px; }
.seo-content p { margin-bottom: 16px; color: var(--text-secondary); }
.seo-content strong { color: var(--text-primary); }

/* About stats grid */
.about-stats { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 16px; margin: 24px 0; }
.about-stat-card { display: flex; flex-direction: column; align-items: center; padding: 20px; background: var(--surface-1); border-radius: 12px; text-decoration: none; transition: transform 0.15s; }
.about-stat-card:hover { transform: translateY(-3px); }
.about-stat-icon { font-size: 2rem; margin-bottom: 8px; }
.about-stat-count { font-size: 1.6rem; font-weight: 800; color: var(--brand); }
.about-stat-name { font-size: 0.85rem; color: var(--text-muted); margin-top: 4px; }

/* Blog grid */
.blog-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 24px; margin: 24px 0; }
.blog-card { display: block; padding: 28px; background: var(--surface-1); border-radius: 12px; text-decoration: none; transition: transform 0.15s, box-shadow 0.15s; }
.blog-card:hover { transform: translateY(-3px); box-shadow: 0 8px 30px rgba(0,0,0,0.08); }
.blog-card h2 { font-size: 1.2rem; font-weight: 700; margin: 8px 0; color: var(--text-primary); }
.blog-card p { font-size: 0.92rem; color: var(--text-muted); margin: 0; }
.blog-card time { font-size: 0.8rem; color: var(--text-muted); margin-top: 12px; display: block; }
.blog-card-cat { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; color: var(--brand); }

/* Blog article */
.blog-article { max-width: 720px; margin: 0 auto; }
.blog-article-header { text-align: center; padding: 60px 0 32px; }
.blog-article-header h1 { font-size: 2.2rem; font-weight: 800; margin: 12px 0; }
.blog-excerpt { font-size: 1.1rem; color: var(--text-muted); }
.blog-article-body { line-height: 1.8; }
.blog-article-body h2 { font-size: 1.4rem; font-weight: 700; margin: 36px 0 14px; }
.blog-article-body p { margin-bottom: 16px; color: var(--text-secondary); }
.blog-tools-cta { margin-top: 40px; padding: 28px; background: var(--surface-1); border-radius: 12px; }
.blog-tools-cta h3 { margin-bottom: 12px; }
.blog-tools-list { display: flex; flex-wrap: wrap; gap: 8px; }
.blog-related { max-width: 800px; margin: 60px auto 0; }
.blog-related h3 { font-size: 1.3rem; margin-bottom: 20px; }

/* Comparison page */
.comparison-header { display: flex; align-items: center; justify-content: center; gap: 16px; margin: 32px 0; flex-wrap: wrap; }
.comp-badge { padding: 12px 24px; border-radius: 10px; font-weight: 700; font-size: 1rem; }
.comp-us { background: var(--brand); color: white; }
.comp-them { background: var(--surface-2); color: var(--text-primary); }
.comp-vs { font-size: 1.2rem; font-weight: 800; color: var(--text-muted); }
.comparison-verdict { margin-top: 40px; padding: 24px; background: linear-gradient(135deg, var(--surface-1), var(--surface-2)); border-radius: 12px; border-left: 4px solid var(--brand); }
.comparison-cta, .usecase-cta { text-align: center; margin-top: 48px; padding: 40px; background: var(--surface-1); border-radius: 16px; }
.cta-btn { display: inline-block; margin-top: 16px; padding: 14px 32px; background: var(--brand); color: white; border-radius: 10px; font-weight: 700; text-decoration: none; transition: transform 0.15s; }
.cta-btn:hover { transform: translateY(-2px); }

/* Use-case page */
.usecase-section { margin-bottom: 40px; }
.usecase-tools { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }

@media (max-width: 640px) {
  .seo-hero h1 { font-size: 1.8rem; }
  .blog-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: repeat(2, 1fr); }
}