:root {
  /* 1. Color Palette */
  /* Primary Colors */
  --google-blue: #1a73e8;
  --google-red: #d93025;
  --google-yellow: #f9ab00;
  --google-green: #1e8e3e;

  /* Surface Colors */
  --surface-light: #FFFFFF;
  --surface-dim: #F8F9FA;
  --surface-border: #DADCE0;

  /* Text Colors */
  --text-primary: #202124;
  --text-secondary: #5F6368;
  --text-tertiary: #80868B;

  /* 2. Typography */
  --font-family-base: 'Product Sans', 'Roboto', 'Inter', sans-serif;

  --font-size-display: 3.5rem;
  /* Avg between 3-5rem */
  --font-weight-display: 400;
  --line-height-display: 1.1;

  --font-size-h1: 2.5rem;
  --font-weight-h1: 400;
  --line-height-h1: 1.2;

  --font-size-h2: 2rem;
  --font-weight-h2: 400;
  --line-height-h2: 1.3;

  --font-size-h3: 1.5rem;
  --font-weight-h3: 400;
  --line-height-h3: 1.4;

  --font-size-body-lg: 1.125rem;
  --font-weight-body: 400;
  --line-height-body: 1.5;

  --font-size-body-md: 1rem;

  --font-size-btn: 0.875rem;
  --font-weight-btn: 500;
  --line-height-btn: 1.25;

  /* 3. Elevation & Shadows */
  --shadow-1: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 1px 3px 1px rgba(60, 64, 67, 0.15);
  --shadow-2: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 2px 6px 2px rgba(60, 64, 67, 0.15);
  --shadow-3: 0 4px 8px 3px rgba(60, 64, 67, 0.15);

  /* 4. Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 64px;

  /* Legacy Material CSS aliases */
  --md-primary: var(--google-blue);
  --md-on-primary: #ffffff;
  --md-primary-container: var(--google-blue-variant, #e8f0fe);
  --md-on-primary-container: #041e49;
  --md-surface: var(--surface-light);
  --md-surface-variant: #f1f3f4;
  --md-on-surface: var(--text-primary);
  --md-on-surface-variant: var(--text-secondary);
  --md-background: var(--surface-dim);
  --md-on-background: var(--text-primary);
  --md-outline: var(--surface-border);
  --md-outline-variant: #e8eaed;
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 16px;
  --border-radius-xl: 28px;
  --sidebar-width: 280px;
  --header-height: 64px;
}

/* Global Reset & Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family-base);
  background-color: var(--surface-light);
  color: var(--text-primary);
  line-height: var(--line-height-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--font-size-h1);
  line-height: var(--line-height-h1);
  font-weight: var(--font-weight-h1);
}

h2 {
  font-size: var(--font-size-h2);
  line-height: var(--line-height-h2);
  font-weight: var(--font-weight-h2);
}

h3 {
  font-size: var(--font-size-h3);
  line-height: var(--line-height-h3);
  font-weight: var(--font-weight-h3);
}

p {
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-body-md);
}

a {
  text-decoration: none;
  color: var(--google-blue);
  transition: all 0.2s ease-in-out;
}

ul {
  list-style: none;
}

/* Utilities */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

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

.d-flex {
  display: flex;
}

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

.justify-between {
  justify-content: space-between;
}

.justify-center {
  justify-content: center;
}

.grid {
  display: grid;
}

/* Google Auth Button */
.btn-google {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  background-color: white;
  color: #3c4043;
  border: 1px solid #dadce0;
  border-radius: 4px;
  padding: 10px 15px;
  font-family: 'Google Sans', 'Roboto', arial, sans-serif;
  font-weight: 500;
  font-size: 0.875rem;
  text-decoration: none;
  transition: background-color 0.2s, border-color 0.2s;
}

.btn-google:hover {
  background-color: #f8f9fa;
  border-color: #d2e3fc;
  cursor: pointer;
}

.btn-google img {
  height: 18px;
  width: 18px;
  margin-right: 12px;
}

/* Layout */
.dashboard-wrapper {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: var(--sidebar-width);
  background: var(--md-surface);
  border-right: 1px solid var(--md-outline-variant);
  display: flex;
  flex-direction: column;
  position: fixed;
  height: 100vh;
  z-index: 100;
  transition: transform 0.3s ease;
}

.main-content {
  flex: 1;
  padding: var(--spacing-lg);
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.header {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-lg);
  background: var(--md-surface);
  border-bottom: 1px solid var(--md-outline-variant);
  position: sticky; /* Keep sticky? For site-header it's custom. We might drop this or keep it. */
  top: 0;
  z-index: 90;
}

/* Sidebar Components */
.sidebar-header {
  padding: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.sidebar-nav {
  padding: var(--spacing-sm);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  flex: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: 12px var(--spacing-md);
  border-radius: var(--border-radius-xl);
  color: var(--md-on-surface-variant);
  font-weight: 500;
  font-size: 0.875rem;
  transition: all 0.2s;
}

.nav-item i {
  font-size: 1.25rem;
  width: 24px;
  text-align: center;
}

.nav-item:hover {
  background-color: var(--md-surface-variant);
  color: var(--md-on-surface);
}

.nav-item.active {
  background-color: var(--md-primary-container);
  color: var(--md-on-primary-container);
}

/* Cards */
.card {
  background: var(--md-surface);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  border: 1px solid var(--md-outline-variant);
  transition: box-shadow 0.2s, transform 0.2s;
}

.card:hover {
  box-shadow: var(--elevation-1);
}

.card-elevated {
  box-shadow: var(--elevation-1);
  border: none;
}

.card-elevated:hover {
  box-shadow: var(--elevation-2);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 10px 24px;
  border-radius: var(--border-radius-xl);
  font-weight: 500;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  font-family: var(--font-family-heading);
}

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

.btn-primary:hover {
  box-shadow: var(--elevation-1);
  background-color: #1765cc;
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--md-outline);
  color: var(--md-primary);
}

.btn-outline:hover {
  background-color: var(--md-surface-variant);
  border-color: var(--md-primary);
}

.btn-tonal {
  background-color: var(--md-primary-container);
  color: var(--md-on-primary-container);
}

.btn-tonal:hover {
  box-shadow: var(--elevation-1);
}

/* Utilities */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.d-flex { display: flex; }
.flex-column { flex-direction: column; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-md { gap: var(--spacing-md); }

.text-secondary { color: var(--md-on-surface-variant); }
.text-primary { color: var(--md-on-surface); }

/* Badges/Status */
.badge {
  padding: 4px 12px;
  border-radius: var(--border-radius-md);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.badge-success { background: var(--google-green-variant); color: var(--google-green); }
.badge-error { background: var(--google-red-variant); color: var(--google-red); }
.badge-warning { background: var(--google-yellow-variant); color: var(--google-yellow); }
.badge-info { background: var(--google-blue-variant); color: var(--google-blue); }

/* Animation */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
  animation: fadeIn 0.4s ease forwards;
}

/* Responsive */
@media (max-width: 992px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .main-content {
    margin-left: 0;
  }
  .sidebar.open {
    transform: translateX(0);
  }
  #sidebarToggle {
    display: block !important;
  }
}

@media (max-width: 768px) {
  .grid-2 { grid-template-columns: 1fr !important; }
}