/* HouseholdRobot.net - Zero-JS, 100/100 PageSpeed CSS */
/* System Fonts for Speed - No Web Fonts */
:root {
  --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;

  --color-primary: #2563eb;
  --color-primary-dark: #1e40af;
  --color-secondary: #10b981;
  --color-text: #111827;
  --color-text-light: #6b7280;
  --color-bg: #ffffff;
  --color-bg-alt: #f9fafb;
  --color-border: #e5e7eb;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;

  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  --radius: 0.375rem;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

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

html {
  font-size: 16px;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-system);
  color: var(--color-text);
  background: var(--color-bg);
  overflow-x: hidden;
}

/* Typography - Text First */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: var(--spacing-md);
  line-height: 1.75;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

/* Layout - Mobile First */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-wide {
  max-width: 1400px;
}

.container-narrow {
  max-width: 800px;
}

/* Header */
.header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.95);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-md);
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo:hover {
  text-decoration: none;
}

.nav {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav a {
  font-weight: 500;
  color: var(--color-text);
  font-size: 0.9375rem;
  white-space: nowrap;
}

.nav a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

/* Breadcrumb */
.breadcrumb {
  padding: var(--spacing-md) 0;
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.breadcrumb a {
  color: var(--color-text-light);
}

.breadcrumb span {
  margin: 0 var(--spacing-xs);
}

/* Alert Boxes - The "TL;DR" First Approach */
.alert {
  padding: var(--spacing-lg);
  border-radius: var(--radius);
  margin-bottom: var(--spacing-xl);
  border-left: 4px solid;
}

.alert-success {
  background: #f0fdf4;
  border-color: var(--color-success);
  color: #166534;
}

.alert-info {
  background: #eff6ff;
  border-color: var(--color-primary);
  color: #1e40af;
}

.alert-warning {
  background: #fffbeb;
  border-color: var(--color-warning);
  color: #92400e;
}

.alert-error {
  background: #fef2f2;
  border-color: var(--color-error);
  color: #991b1b;
}

.alert h3 {
  margin-top: 0;
  margin-bottom: var(--spacing-sm);
  font-size: 1.125rem;
}

.alert p:last-child {
  margin-bottom: 0;
}

/* Tables - Data First */
.table-wrapper {
  overflow-x: auto;
  margin: var(--spacing-xl) 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

thead {
  background: var(--color-bg-alt);
  position: sticky;
  top: 0;
}

th {
  padding: var(--spacing-md);
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid var(--color-border);
}

td {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

tr:last-child td {
  border-bottom: none;
}

tr:hover {
  background: var(--color-bg-alt);
}

.table-compare th:first-child,
.table-compare td:first-child {
  font-weight: 600;
  background: var(--color-bg-alt);
  position: sticky;
  left: 0;
}

/* Spec Bars - CSS Data Visualization */
.spec-bar {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin: var(--spacing-sm) 0;
}

.spec-bar-label {
  min-width: 120px;
  font-size: 0.875rem;
  font-weight: 500;
}

.spec-bar-track {
  flex: 1;
  height: 20px;
  background: var(--color-bg-alt);
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
}

.spec-bar-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: var(--radius);
  transition: width 0.3s ease;
}

.spec-bar-value {
  min-width: 80px;
  text-align: right;
  font-size: 0.875rem;
  font-weight: 600;
}

/* Card Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-lg);
  transition: box-shadow 0.2s ease;
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card h3 {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-sm);
}

.card p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
}

/* Tags/Badges */
.tag {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--color-bg-alt);
  border-radius: var(--radius);
  font-size: 0.8125rem;
  font-weight: 500;
  margin-right: var(--spacing-xs);
  margin-bottom: var(--spacing-xs);
  color: var(--color-text);
}

.tag-success { background: #d1fae5; color: #065f46; }
.tag-warning { background: #fef3c7; color: #92400e; }
.tag-primary { background: #dbeafe; color: #1e40af; }

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius);
  font-weight: 500;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background 0.2s ease;
  font-size: 0.9375rem;
}

.btn:hover {
  background: var(--color-primary-dark);
  text-decoration: none;
  color: white;
}

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

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

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

/* Lists */
ul, ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-xl);
}

li {
  margin-bottom: var(--spacing-sm);
  line-height: 1.75;
}

.list-check {
  list-style: none;
  padding-left: 0;
}

.list-check li::before {
  content: "✓ ";
  color: var(--color-success);
  font-weight: 700;
  margin-right: var(--spacing-sm);
}

.list-x {
  list-style: none;
  padding-left: 0;
}

.list-x li::before {
  content: "✗ ";
  color: var(--color-error);
  font-weight: 700;
  margin-right: var(--spacing-sm);
}

/* Pros/Cons Boxes */
.pros-cons {
  display: grid;
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.pros, .cons {
  padding: var(--spacing-lg);
  border-radius: var(--radius);
  border-left: 4px solid;
}

.pros {
  background: #f0fdf4;
  border-color: var(--color-success);
}

.cons {
  background: #fef2f2;
  border-color: var(--color-error);
}

.pros h3, .cons h3 {
  margin-top: 0;
  font-size: 1.125rem;
}

/* TOC - Table of Contents */
.toc {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.toc h2 {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-md);
}

.toc ul {
  list-style: none;
  padding-left: 0;
}

.toc li {
  margin-bottom: var(--spacing-sm);
}

.toc a {
  color: var(--color-text);
  font-size: 0.9375rem;
}

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

/* Footer */
.footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  margin-top: var(--spacing-2xl);
  padding: var(--spacing-2xl) 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer h4 {
  font-size: 1rem;
  margin-bottom: var(--spacing-md);
}

.footer ul {
  list-style: none;
  padding: 0;
}

.footer li {
  margin-bottom: var(--spacing-sm);
}

.footer a {
  color: var(--color-text-light);
  font-size: 0.9375rem;
}

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

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-light);
  font-size: 0.875rem;
}

/* Main Content */
main {
  min-height: 60vh;
  padding: var(--spacing-xl) 0;
}

article {
  max-width: 800px;
  margin: 0 auto;
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: var(--spacing-2xl) 0;
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.hero h1 {
  color: white;
  margin-bottom: var(--spacing-md);
}

.hero p {
  font-size: 1.125rem;
  opacity: 0.95;
  max-width: 800px;
  margin: 0 auto var(--spacing-lg);
}

/* Section */
section {
  margin: var(--spacing-2xl) 0;
}

section h2 {
  border-bottom: 2px solid var(--color-border);
  padding-bottom: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

/* Responsive - Desktop */
@media (min-width: 768px) {
  h1 { font-size: 3rem; }
  h2 { font-size: 2.25rem; }
  h3 { font-size: 1.875rem; }

  .container {
    padding: 0 var(--spacing-xl);
  }

  .pros-cons {
    grid-template-columns: 1fr 1fr;
  }

  .nav {
    gap: var(--spacing-xl);
  }
}

@media (min-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Print Styles */
@media print {
  .header, .footer, .nav, .toc {
    display: none;
  }

  body {
    font-size: 12pt;
    color: black;
  }

  a {
    color: black;
    text-decoration: underline;
  }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--color-text-light); }
.text-small { font-size: 0.875rem; }
.font-bold { font-weight: 700; }
.mb-0 { margin-bottom: 0; }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.hidden { display: none; }

/* Winner Badge in Comparison Tables */
.winner {
  background: #d1fae5;
  font-weight: 600;
  color: #065f46;
}

/* Spec List */
.spec-list {
  list-style: none;
  padding: 0;
  display: grid;
  gap: var(--spacing-sm);
}

.spec-list li {
  display: flex;
  justify-content: space-between;
  padding: var(--spacing-sm);
  background: var(--color-bg-alt);
  border-radius: var(--radius);
  font-size: 0.9375rem;
}

.spec-list strong {
  color: var(--color-text);
}

.spec-list span {
  color: var(--color-text-light);
}