/* ==========================================================================
   OmniTools Design System - Multi-Page Architecture (MPA)
   ========================================================================== */

:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --bg-card-hover: #334155;
  --bg-input: #0f172a;
  --border-color: #334155;
  --border-focus: #6366f1;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-inverse: #0f172a;

  --accent-primary: #6366f1;
  --accent-hover: #4f46e5;
  --accent-light: rgba(99, 102, 241, 0.15);
  
  --finance-color: #6366f1;
  --converter-color: #06b6d4;
  --health-color: #10b981;
  --math-color: #f59e0b;
  --interest-color: #ec4899;

  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;

  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
  --glass-bg: rgba(30, 41, 59, 0.85);
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-input: #f8fafc;
  --border-color: #e2e8f0;
  --border-focus: #4f46e5;
  
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-inverse: #ffffff;

  --glass-bg: rgba(255, 255, 255, 0.9);
  --shadow-sm: 0 2px 4px 0 rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 20px -3px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.25s ease, color 0.25s ease;
}

a {
  color: var(--accent-primary);
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

.hidden { display: none !important; }

/* Header & Navigation */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 12px 24px;
}

.header-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.logo-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent-primary), #818cf8);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-name {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-main);
}

.brand-name .highlight { color: var(--accent-primary); }

.badge-pro {
  font-size: 0.65rem;
  font-weight: 700;
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
  padding: 2px 8px;
  border-radius: 20px;
}

.search-box {
  position: relative;
  flex: 1;
  max-width: 480px;
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.search-box input {
  width: 100%;
  padding: 10px 16px 10px 42px;
  border-radius: 30px;
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  color: var(--text-main);
  font-size: 0.9rem;
  outline: none;
}

.search-box input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.search-results-dropdown {
  position: absolute;
  top: 110%;
  left: 0;
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  max-height: 350px;
  overflow-y: auto;
  z-index: 200;
}

.search-result-item {
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
}

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

.theme-toggle-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-main);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
}

[data-theme="dark"] .sun-icon { display: block; }
[data-theme="dark"] .moon-icon { display: none; }
[data-theme="light"] .sun-icon { display: none; }
[data-theme="light"] .moon-icon { display: block; }

/* Breadcrumbs Navigation */
.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.breadcrumb-nav a { color: var(--text-muted); }
.breadcrumb-nav a:hover { color: var(--accent-primary); }

/* Main Wrapper */
.main-wrapper {
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: 24px 24px 40px 24px;
  flex: 1;
}

.content-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 24px;
}

.sidebar-area {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.promo-card, .widget-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.promo-badge {
  font-size: 0.65rem;
  font-weight: 800;
  color: #f59e0b;
  margin-bottom: 8px;
}

.promo-card h3 { font-size: 1rem; margin-bottom: 8px; }
.promo-card p { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 14px; }

.quick-links-list { list-style: none; margin-top: 12px; }
.quick-links-list li { margin-bottom: 10px; }
.quick-links-list a { font-size: 0.88rem; color: var(--text-muted); }
.quick-links-list a:hover { color: var(--accent-primary); }

/* Hero & Category Cards Grid */
.hero-card {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(6, 182, 212, 0.1) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 30px;
}

.hero-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-primary);
  background: var(--accent-light);
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 12px;
}

.hero-card h1 { font-size: 1.8rem; font-weight: 800; margin-bottom: 10px; }
.hero-card p { color: var(--text-muted); font-size: 1rem; max-width: 700px; margin-bottom: 16px; }

.trust-indicators {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.82rem;
  font-weight: 600;
}

.grid-section { margin-bottom: 32px; }
.section-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.section-header h2 { font-size: 1.25rem; font-weight: 700; }

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.tool-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  text-decoration: none;
  color: var(--text-main);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}

.finance-bg { background: rgba(99, 102, 241, 0.12); }
.converter-bg { background: rgba(6, 182, 212, 0.12); }
.health-bg { background: rgba(16, 185, 129, 0.12); }

.card-info h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 4px; }
.card-info p { font-size: 0.8rem; color: var(--text-muted); line-height: 1.4; }

/* Tool Page Specific Layouts */
.tool-page-header { margin-bottom: 24px; }
.tool-page-header h1 { font-size: 1.8rem; font-weight: 800; margin-bottom: 6px; }
.tool-page-header p { color: var(--text-muted); font-size: 0.95rem; }

.card-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.calculator-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 6px; }

.form-group input[type="number"], .form-group input[type="date"], select {
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  color: var(--text-main);
  font-size: 1rem;
  font-weight: 600;
  outline: none;
}

.range-slider { width: 100%; margin-top: 8px; accent-color: var(--accent-primary); }

.result-highlight-box {
  background: linear-gradient(135deg, var(--accent-primary), #4338ca);
  border-radius: var(--radius-md);
  padding: 20px;
  color: #ffffff;
  text-align: center;
  margin-bottom: 20px;
}

.result-label { font-size: 0.8rem; font-weight: 600; text-transform: uppercase; opacity: 0.9; display: block; }
.result-value { font-size: 2rem; font-weight: 800; font-family: 'JetBrains Mono', monospace; display: block; }

.breakdown-stats { display: flex; flex-direction: column; gap: 10px; }
.stat-item { display: flex; align-items: center; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid var(--border-color); font-size: 0.9rem; }
.stat-name { color: var(--text-muted); }
.stat-val { font-weight: 700; font-family: 'JetBrains Mono', monospace; }

/* SVG Donut Chart */
.chart-container { display: flex; align-items: center; justify-content: center; gap: 20px; margin-top: 16px; }
.donut-chart { width: 110px; height: 110px; transform: rotate(-90deg); }
.chart-legend { font-size: 0.82rem; }
.legend-item { display: flex; align-items: center; gap: 6px; margin-bottom: 6px; }
.legend-item .box { width: 12px; height: 12px; border-radius: 3px; }
.principal-color { background: var(--accent-primary); }
.interest-color { background: var(--interest-color); }

/* Drag and Drop Converter UI */
.drop-zone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  background: rgba(99, 102, 241, 0.02);
}

.drop-zone:hover { border-color: var(--accent-primary); background: var(--accent-light); }
.drop-zone svg { color: var(--accent-primary); margin-bottom: 12px; }
.hidden-file-input { display: none; }

.comparison-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 16px; }
.image-preview-card { border: 1px solid var(--border-color); border-radius: var(--radius-sm); padding: 12px; text-align: center; }
.image-preview-card img { max-width: 100%; max-height: 200px; object-fit: contain; margin: 10px 0; }

.primary-btn-link, .action-btn {
  display: inline-block;
  width: 100%;
  padding: 12px;
  border-radius: var(--radius-sm);
  background: var(--accent-primary);
  color: #ffffff;
  font-weight: 700;
  text-align: center;
  margin-top: 10px;
}

/* Readable SEO Article Content Section */
.seo-article-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-top: 30px;
  line-height: 1.7;
}

.seo-article-content h2 { font-size: 1.3rem; margin-top: 20px; margin-bottom: 10px; }
.seo-article-content p { color: var(--text-muted); font-size: 0.95rem; margin-bottom: 14px; }
.seo-article-content ul { margin-left: 20px; color: var(--text-muted); margin-bottom: 14px; }
.seo-article-content li { margin-bottom: 6px; }

/* Health Meter */
.health-meter { margin: 16px 0; }
.meter-bar { height: 12px; border-radius: 6px; background: linear-gradient(to right, #3b82f6, #10b981, #f59e0b, #ef4444); position: relative; }
.meter-pointer { width: 14px; height: 14px; background: #fff; border: 2px solid #000; border-radius: 50%; position: absolute; top: -1px; transform: translateX(-50%); transition: left 0.3s ease; }
.meter-labels { display: flex; justify-content: space-between; font-size: 0.72rem; color: var(--text-muted); margin-top: 6px; }

/* Footer */
.app-footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding: 40px 24px 20px 24px;
  margin-top: 40px;
}

.footer-container {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 30px;
}

.footer-col h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 12px; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 8px; }
.footer-col a { color: var(--text-muted); font-size: 0.85rem; }
.footer-col a:hover { color: var(--accent-primary); }

.footer-bottom {
  max-width: 1280px;
  margin: 0 auto;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

@media (max-width: 900px) {
  .content-layout, .calculator-layout { grid-template-columns: 1fr; }
  .footer-container { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 600px) {
  .header-container { flex-wrap: wrap; }
  .search-box { order: 3; max-width: 100%; }
  .comparison-grid { grid-template-columns: 1fr; }
  .footer-container { grid-template-columns: 1fr; }
}