/* =============================================
   AI Reality Check — Shared Career Content Styles
   Google-inspired Design System
   ============================================= */

/* ==================
   CSS Variables
   ================== */
:root {
  /* Google Color Palette */
  --primary-blue: #4285F4;
  --primary-red: #EA4335;
  --primary-yellow: #FBBC05;
  --primary-green: #34A853;
  --dark-blue: #1A73E8;
  --light-blue: #8AB4F8;

  /* Aliases used across pages */
  --blue: #4285F4;
  --red: #EA4335;
  --yellow: #FBBC05;
  --green: #34A853;

  /* Neutrals */
  --neutral-dark: #202124;
  --neutral-medium: #5F6368;
  --neutral-light: #E8EAED;
  --dark-gray: #202124;
  --medium-gray: #5F6368;
  --light-gray: #E8EAED;
  --white: #FFFFFF;

  /* Background tints */
  --blue-bg: #E8F0FE;
  --red-bg: #FCE8E6;
  --yellow-bg: #FEF9E7;
  --green-bg: #E6F4EA;

  /* Theme aliases */
  --primary-bg: var(--white);
  --secondary-bg: var(--light-gray);
  --tertiary-bg: #F8F9FA;
  --primary-text: var(--dark-gray);
  --secondary-text: var(--medium-gray);
  --accent-color: var(--primary-blue);
  --secondary-accent: var(--primary-green);
  --highlight-color: var(--primary-yellow);
  --cta-color: var(--primary-red);

  /* Utility */
  --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  --box-shadow-hover: 0 5px 15px rgba(0, 0, 0, 0.15);
  --transition-speed: 0.25s;
  --border-radius: 8px;
  --header-height: 64px;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
  :root {
    --primary-bg: var(--dark-gray);
    --secondary-bg: #303134;
    --tertiary-bg: #404144;
    --primary-text: var(--white);
    --secondary-text: #BDC1C6;
    --accent-color: var(--light-blue);
    --neutral-light: #3C4043;
  }
}

/* Theme classes (for JS-controlled themes) */
.theme-light {
  --primary-bg: #FFFFFF;
  --primary-text: #202124;
  --secondary-bg: #E8EAED;
  --secondary-text: #5F6368;
  --neutral-light: #E8EAED;
}

.theme-dark {
  --primary-bg: #202124;
  --primary-text: #FFFFFF;
  --secondary-bg: #303134;
  --secondary-text: #BDC1C6;
  --neutral-light: #3C4043;
}

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

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

body {
  font-family: 'Roboto', Arial, sans-serif;
  background-color: var(--primary-bg);
  color: var(--primary-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Product Sans', 'Google Sans', Arial, sans-serif;
  margin-bottom: 1rem;
  line-height: 1.2;
}

h1 { font-size: 2.5rem; font-weight: 700; }
h2 { font-size: 2rem; font-weight: 700; color: var(--accent-color); }
h3 { font-size: 1.5rem; font-weight: 500; }
h4 { font-size: 1.25rem; font-weight: 500; }
h5 { font-size: 1.125rem; font-weight: 500; }
h6 { font-size: 1rem; font-weight: 500; }

p { margin-bottom: 1rem; }

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

a:hover { text-decoration: underline; }

ul, ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

li { margin-bottom: 0.25rem; }

img {
  max-width: 100%;
  height: auto;
  display: block;
}

strong { font-weight: 700; }
em { font-style: italic; }

/* ==================
   Accessibility
   ================== */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ==================
   Layout
   ================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container-narrow {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ==================
   Header / Navigation
   ================== */
.header,
header[role="banner"] {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--primary-bg);
  border-bottom: 1px solid var(--neutral-light);
  height: var(--header-height);
  display: flex;
  align-items: center;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.header-container,
header[role="banner"] .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

/* Logo */
.logo {
  position: relative;
  display: inline-flex;
  align-items: center;
  font-family: 'Product Sans', 'Google Sans', sans-serif;
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--neutral-dark);
  text-decoration: none;
  padding-right: 1rem;
  letter-spacing: -0.01em;
}

.logo:hover {
  text-decoration: none;
  color: var(--primary-blue);
}

.logo-dot {
  position: absolute;
  width: 7px;
  height: 7px;
  border-radius: 50%;
}

.logo-dot-1 { background: var(--primary-blue); top: -3px; right: 2px; }
.logo-dot-2 { background: var(--primary-red); top: -3px; right: 12px; }
.logo-dot-3 { background: var(--primary-yellow); bottom: -3px; right: 2px; }
.logo-dot-4 { background: var(--primary-green); bottom: -3px; right: 12px; }

/* Navigation */
.nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

header[role="banner"] nav ul {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-link,
header[role="banner"] nav a {
  padding: 0.5rem 0.75rem;
  color: var(--neutral-medium);
  font-size: 0.9375rem;
  border-radius: 4px;
  transition: color var(--transition-speed), background var(--transition-speed);
  text-decoration: none;
  white-space: nowrap;
}

.nav-link:hover,
header[role="banner"] nav a:hover {
  color: var(--primary-blue);
  background: var(--blue-bg);
  text-decoration: none;
}

.nav-button {
  padding: 0.5rem 1.25rem;
  background: var(--primary-blue);
  color: var(--white) !important;
  border-radius: 24px;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: background var(--transition-speed), box-shadow var(--transition-speed);
  text-decoration: none;
  white-space: nowrap;
}

.nav-button:hover {
  background: var(--dark-blue);
  box-shadow: 0 2px 8px rgba(66, 133, 244, 0.4);
  text-decoration: none;
}

/* Mobile nav toggle */
.mobile-nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.mobile-nav-toggle .bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--neutral-medium);
  border-radius: 2px;
  transition: all var(--transition-speed);
}

/* Theme toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--neutral-light);
  border-radius: 20px;
  padding: 0.25rem 0.75rem;
  cursor: pointer;
  font-size: 0.875rem;
  color: var(--neutral-medium);
  transition: border-color var(--transition-speed), color var(--transition-speed);
}

.theme-toggle:hover {
  border-color: var(--primary-blue);
  color: var(--primary-blue);
}

/* ==================
   Article Pages
   ================== */
.article-page {
  background-color: var(--primary-bg);
}

.article-header {
  background: linear-gradient(135deg, #4285F4 0%, #1A73E8 100%);
  color: var(--white);
  padding: 4rem 0 3rem;
}

.article-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.article-meta {
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.6;
}

.article-date {
  display: inline-block;
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
}

.article-content {
  padding: 3rem 0;
  max-width: 860px;
  margin: 0 auto;
}

.article-section {
  margin-bottom: 2.5rem;
}

.section-title {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--neutral-dark);
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--primary-blue);
}

.icon-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.icon {
  font-size: 1.1em;
  flex-shrink: 0;
}

.icon-list {
  list-style: none;
  padding: 0;
}

.icon-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.625rem 0;
  border-bottom: 1px solid var(--neutral-light);
  margin-bottom: 0;
}

.icon-list li:last-child { border-bottom: none; }

.highlight-box {
  background: var(--blue-bg);
  border-left: 4px solid var(--primary-blue);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  padding: 1.5rem;
  margin: 1.5rem 0;
}

.highlight-box p { margin-bottom: 0.5rem; }
.highlight-box p:last-child { margin-bottom: 0; }

.quote {
  background: var(--tertiary-bg);
  border-left: 4px solid var(--primary-yellow);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  font-style: italic;
  font-size: 1.0625rem;
  color: var(--neutral-medium);
}

.article-tags {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--neutral-light);
  font-size: 0.875rem;
  color: var(--neutral-medium);
}

/* ==================
   Case Study Pages
   ================== */
.case-study-header {
  background: linear-gradient(135deg, #1A73E8 0%, #4285F4 100%);
  color: var(--white);
  padding: 4rem 0 3rem;
}

.breadcrumb {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 1rem;
}

.breadcrumb a {
  color: rgba(255, 255, 255, 0.75);
}

.breadcrumb a:hover {
  color: var(--white);
}

.case-study-content {
  padding: 3rem 0;
}

/* ==================
   Cards & Panels
   ================== */
.card {
  background: var(--primary-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  padding: 1.5rem;
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--box-shadow-hover);
}

.stat-card {
  text-align: center;
  padding: 2rem 1.5rem;
  background: var(--tertiary-bg);
  border-radius: var(--border-radius);
  border: 1px solid var(--neutral-light);
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-blue);
  margin-bottom: 0.5rem;
  font-family: 'Product Sans', sans-serif;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--neutral-medium);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Grid layouts */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

/* ==================
   Tables
   ================== */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
  font-size: 0.9375rem;
}

th {
  background: var(--primary-blue);
  color: var(--white);
  padding: 0.75rem 1rem;
  text-align: left;
  font-weight: 500;
}

td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--neutral-light);
  color: var(--primary-text);
}

tr:nth-child(even) td {
  background: var(--tertiary-bg);
}

tr:hover td {
  background: var(--blue-bg);
}

/* ==================
   Tags / Badges
   ================== */
.tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.8125rem;
  font-weight: 500;
  background: var(--blue-bg);
  color: var(--primary-blue);
  margin: 0.25rem;
}

.tag-red { background: var(--red-bg); color: var(--primary-red); }
.tag-green { background: var(--green-bg); color: var(--primary-green); }
.tag-yellow { background: var(--yellow-bg); color: #B06000; }

/* ==================
   Buttons
   ================== */
.btn {
  display: inline-block;
  padding: 0.625rem 1.5rem;
  border-radius: 4px;
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-speed);
  text-decoration: none;
  border: 2px solid transparent;
}

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

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

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

.btn-outline:hover {
  background: var(--blue-bg);
  text-decoration: none;
}

/* ==================
   Footer
   ================== */
.footer,
footer {
  background: var(--neutral-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 2rem 0;
  text-align: center;
  font-size: 0.875rem;
  margin-top: auto;
}

.footer a,
footer a {
  color: rgba(255, 255, 255, 0.85);
}

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

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 0.75rem;
  flex-wrap: wrap;
}

.social-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  color: var(--white);
  transition: background var(--transition-speed);
}

.social-icon:hover {
  background: rgba(255, 255, 255, 0.2);
  text-decoration: none;
}

.social-link {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color var(--transition-speed);
}

.social-link:hover {
  color: var(--white);
}

/* ==================
   Utilities
   ================== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-blue { color: var(--primary-blue); }
.text-red { color: var(--primary-red); }
.text-green { color: var(--primary-green); }
.text-muted { color: var(--neutral-medium); }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }
.p-4 { padding: 2rem; }

.border-top { border-top: 1px solid var(--neutral-light); }
.border-bottom { border-bottom: 1px solid var(--neutral-light); }

/* ==================
   Responsive
   ================== */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  .article-title { font-size: 1.75rem; }
  .article-header { padding: 2.5rem 0 2rem; }
  .nav { gap: 0.1rem; }
  .nav-link { padding: 0.375rem 0.5rem; font-size: 0.875rem; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-2 { grid-template-columns: 1fr; }
  .mobile-nav-toggle { display: flex; }
  header[role="banner"] nav { display: none; }
  header[role="banner"] nav.is-open { display: flex; }
}

@media (max-width: 480px) {
  h1 { font-size: 1.75rem; }
  .article-title { font-size: 1.5rem; }
  .nav { display: none; }
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
}