/* ================================
   App Tools - Global Styles
   ================================ */

/* CSS Variables */
:root {
  --primary-color: #4f46e5;
  --primary-hover: #4338ca;
  --secondary-color: #64748b;
  --accent-color: #f59e0b;
  --bg-color: #f8fafc;
  --card-bg: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --transition: all 0.2s ease;
}

/* Reset */
*, *::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-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  text-decoration: none;
  color: inherit;
}

button {
  cursor: pointer;
  font-family: inherit;
}

/* ================================
   Layout
   ================================ */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ================================
   Header / Navigation
   ================================ */

.header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 3rem;
  font-weight: 700;
  color: #000;
}

.logo span {
  color: var(--text-primary);
}

.nav-links {
  display: flex;
  gap: 24px;
}

.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  transition: var(--transition);
}

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

/* ================================
   Hero Section
   ================================ */

.hero {
  text-align: center;
  padding: 60px 0 40px;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.hero p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

/* Search Box */
.search-box {
  max-width: 500px;
  margin: 0 auto 32px;
  position: relative;
}

.search-box input {
  width: 100%;
  padding: 14px 20px;
  padding-left: 48px;
  font-size: 1rem;
  border: 2px solid var(--border-color);
  border-radius: 50px;
  outline: none;
  transition: var(--transition);
}

.search-box input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.search-box::before {
  content: "🔍";
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.25rem;
}

/* ================================
   AdSense Banner
   ================================ */

.adsense-placeholder {
  background: #f1f5f9;
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.875rem;
  height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ================================
   Category Tabs
   ================================ */

.category-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 32px;
}

.category-tab {
  padding: 8px 20px;
  border: none;
  background: var(--card-bg);
  color: var(--text-secondary);
  font-weight: 500;
  border-radius: 50px;
  transition: var(--transition);
  border: 1px solid var(--border-color);
}

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

.category-tab.active {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

/* ================================
   Tool Grid
   ================================ */

.section-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}

/* Tool Card */
.tool-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition);
  cursor: pointer;
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.tool-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.tool-card h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.tool-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.5;
}

.tool-tag {
  display: inline-block;
  padding: 4px 12px;
  background: #f1f5f9;
  color: var(--text-secondary);
  font-size: 0.75rem;
  border-radius: 50px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ================================
   Featured Tools (Horizontal Scroll)
   ================================ */

.featured-tools {
  margin-bottom: 48px;
}

.featured-scroll {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  padding-bottom: 16px;
  scroll-snap-type: x mandatory;
}

.featured-scroll::-webkit-scrollbar {
  height: 6px;
}

.featured-scroll::-webkit-scrollbar-track {
  background: var(--border-color);
  border-radius: 3px;
}

.featured-scroll::-webkit-scrollbar-thumb {
  background: var(--secondary-color);
  border-radius: 3px;
}

.featured-card {
  flex: 0 0 280px;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
  border-radius: var(--radius-lg);
  padding: 24px;
  color: white;
  scroll-snap-align: start;
}

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

.featured-card h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.featured-card p {
  font-size: 0.875rem;
  opacity: 0.9;
  margin-bottom: 16px;
}

.featured-card .btn {
  background: white;
  color: var(--primary-color);
}

.featured-card .btn:hover {
  background: #f1f5f9;
}

/* ================================
   Buttons
   ================================ */

.btn {
  display: inline-block;
  padding: 10px 20px;
  font-weight: 600;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
  border: none;
  transition: var(--transition);
}

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

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

.btn-secondary {
  background: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

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

/* ================================
   Tool Page Layout
   ================================ */

.tool-page {
  padding: 40px 0;
}

.tool-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
}

.tool-header .tool-icon {
  font-size: 3rem;
  margin-bottom: 0;
}

.tool-header h1 {
  font-size: 2rem;
  color: var(--text-primary);
}

.tool-header p {
  color: var(--text-secondary);
  font-size: 1rem;
}

.tool-content {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  margin-bottom: 32px;
}

/* Tool Specific Styles */
.tool-input-group {
  margin-bottom: 20px;
}

.tool-input-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.tool-input-group textarea,
.tool-input-group input {
  width: 100%;
  padding: 12px;
  font-size: 1rem;
  font-family: 'Monaco', 'Consolas', monospace;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  resize: vertical;
  transition: var(--transition);
}

.tool-input-group textarea:focus,
.tool-input-group input:focus {
  outline: none;
  border-color: var(--primary-color);
}

.tool-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.tool-actions .btn {
  padding: 12px 24px;
  font-size: 1rem;
}

.tool-output {
  background: #1e293b;
  color: #e2e8f0;
  border-radius: var(--radius-sm);
  padding: 16px;
  font-family: 'Monaco', 'Consolas', monospace;
  font-size: 0.875rem;
  white-space: pre-wrap;
  word-break: break-all;
  min-height: 120px;
}

/* Related Tools */
.related-tools {
  margin-top: 32px;
}

.related-tools h3 {
  font-size: 1.125rem;
  margin-bottom: 16px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}

.related-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  transition: var(--transition);
}

.related-card:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-md);
}

.related-card .tool-icon {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.related-card h4 {
  font-size: 0.875rem;
  margin-bottom: 4px;
}

.related-card p {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* ================================
   Footer
   ================================ */

.footer {
  text-align: center;
  padding: 32px 0;
  color: var(--text-secondary);
  font-size: 0.875rem;
  border-top: 1px solid var(--border-color);
  margin-top: 48px;
}

/* ================================
   Responsive Design
   ================================ */

@media (max-width: 768px) {
  .hero h1 {
    font-size: 1.75rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .tool-grid {
    grid-template-columns: 1fr;
  }

  .tool-content {
    padding: 20px;
  }

  .nav-links {
    gap: 16px;
    font-size: 0.875rem;
  }

  .category-tabs {
    gap: 6px;
  }

  .category-tab {
    padding: 6px 14px;
    font-size: 0.875rem;
  }
}

/* ================================
   Utilities
   ================================ */

.hidden {
  display: none !important;
}

.text-center {
  text-align: center;
}

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }

/* ================================
   Game Instructions
   ================================ */

.game-instructions {
  background: #f8fafc;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 16px;
  margin: 16px 0;
}

.game-instructions h3 {
  color: #3b82f6;
  margin-bottom: 8px;
  font-size: 1rem;
}

.game-instructions p {
  color: #64748b;
  font-size: 0.9rem;
  line-height: 1.6;
}

.game-instructions strong {
  color: #1e293b;
}