/* ========================================
   REAL-TIME AQI DASHBOARD - STRUCTURAL CSS
   Based on Figma Design Analysis
   ======================================== */

/* ========================================
   CSS CUSTOM PROPERTIES (DESIGN TOKENS)
   ======================================== */
:root {
  /* Layout Dimensions */
  --container-width: 1440px;
  --header-height: 80px;
  --section-padding: 24px;
  --card-padding: 20px;
  --border-radius: 12px;
  --border-radius-large: 20px;
  
  /* Spacing System */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;
  
  /* Typography Scale */
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 32px;
  --font-size-4xl: 48px;
  --font-size-5xl: 64px;
  
  /* Font Weights */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Line Heights */
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.6;
  
  /* Colors */
  --color-primary: #2563eb;
  --color-secondary: #64748b;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --color-info: #06b6d4;
  
  /* AQI Colors */
  --aqi-good: #00e400;
  --aqi-moderate: #ffff00;
  --aqi-unhealthy-sensitive: #ff7e00;
  --aqi-unhealthy: #ff0000;
  --aqi-very-unhealthy: #8f3f97;
  --aqi-hazardous: #7e0023;
  
  /* Neutral Colors */
  --color-white: #ffffff;
  --color-gray-50: #f8fafc;
  --color-gray-100: #f1f5f9;
  --color-gray-200: #e2e8f0;
  --color-gray-300: #cbd5e1;
  --color-gray-400: #94a3b8;
  --color-gray-500: #64748b;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1e293b;
  --color-gray-900: #0f172a;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
}

/* ========================================
   RESET & BASE STYLES
   ======================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-gray-800);
  background-color: var(--color-gray-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   LAYOUT CONTAINERS
   ======================================== */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container-fluid {
  width: 100%;
  padding: 0 var(--spacing-lg);
}

/* ========================================
   HEADER STRUCTURE
   ======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  z-index: 1000;
  display: flex;
  align-items: center;
  padding: 0 var(--spacing-lg);
}

.header__content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
}

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

.header__search {
  flex: 1;
  max-width: 400px;
  margin: 0 var(--spacing-xl);
}

.header__search-input {
  width: 100%;
  height: 40px;
  padding: 0 var(--spacing-md);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  background: var(--color-gray-50);
  transition: var(--transition-fast);
}

.header__search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  background: var(--color-white);
  box-shadow: 0 0 0 3px rgb(37 99 235 / 0.1);
}

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

/* ========================================
   MAIN CONTENT STRUCTURE
   ======================================== */
.main-content {
  margin-top: var(--header-height);
  min-height: calc(100vh - var(--header-height));
}

/* ========================================
   SECTION STRUCTURE
   ======================================== */
.section {
  padding: var(--spacing-2xl) 0;
}

.section--compact {
  padding: var(--spacing-lg) 0;
}

.section--large {
  padding: var(--spacing-3xl) 0;
}

.section__header {
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.section__title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-sm);
}

.section__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-gray-600);
  font-weight: var(--font-weight-normal);
}

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

.grid--2-cols {
  grid-template-columns: repeat(2, 1fr);
}

.grid--3-cols {
  grid-template-columns: repeat(3, 1fr);
}

.grid--4-cols {
  grid-template-columns: repeat(4, 1fr);
}

.grid--auto-fit {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid--auto-fill {
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
}

/* ========================================
   FLEXBOX UTILITIES
   ======================================== */
.flex {
  display: flex;
}

.flex--column {
  flex-direction: column;
}

.flex--row {
  flex-direction: row;
}

.flex--wrap {
  flex-wrap: wrap;
}

.flex--nowrap {
  flex-wrap: nowrap;
}

.flex--center {
  align-items: center;
  justify-content: center;
}

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

.flex--around {
  justify-content: space-around;
}

.flex--evenly {
  justify-content: space-evenly;
}

.flex--start {
  align-items: flex-start;
}

.flex--end {
  align-items: flex-end;
}

.flex--stretch {
  align-items: stretch;
}

/* ========================================
   CARD STRUCTURE
   ======================================== */
.card {
  background: var(--color-white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card--elevated {
  box-shadow: var(--shadow-lg);
}

.card--flat {
  box-shadow: none;
  border: 1px solid var(--color-gray-200);
}

.card__header {
  padding: var(--card-padding);
  border-bottom: 1px solid var(--color-gray-200);
}

.card__body {
  padding: var(--card-padding);
}

.card__footer {
  padding: var(--card-padding);
  border-top: 1px solid var(--color-gray-200);
  background: var(--color-gray-50);
}

/* ========================================
   AQI SPECIFIC COMPONENTS
   ======================================== */
.aqi-dial {
  position: relative;
  width: 200px;
  height: 200px;
  margin: 0 auto;
}

.aqi-dial__circle {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  position: relative;
}

.aqi-dial__value {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
}

.aqi-dial__label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.aqi-dial__status {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-top: var(--spacing-xs);
}

/* AQI Status Colors */
.aqi-status--good {
  color: var(--aqi-good);
}

.aqi-status--moderate {
  color: var(--aqi-moderate);
}

.aqi-status--unhealthy-sensitive {
  color: var(--aqi-unhealthy-sensitive);
}

.aqi-status--unhealthy {
  color: var(--aqi-unhealthy);
}

.aqi-status--very-unhealthy {
  color: var(--aqi-very-unhealthy);
}

.aqi-status--hazardous {
  color: var(--aqi-hazardous);
}

/* ========================================
   LOCATION CARDS
   ======================================== */
.location-cards {
  display: flex;
  gap: var(--spacing-md);
  overflow-x: auto;
  padding: var(--spacing-md) 0;
  scrollbar-width: thin;
}

.location-card {
  min-width: 200px;
  background: var(--color-white);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-gray-200);
  transition: var(--transition-fast);
  cursor: pointer;
}

.location-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.location-card__name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-800);
  margin-bottom: var(--spacing-xs);
}

.location-card__distance {
  font-size: var(--font-size-xs);
  color: var(--color-gray-500);
  margin-bottom: var(--spacing-sm);
}

.location-card__aqi {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.location-card__aqi-value {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
}

.location-card__aqi-status {
  font-size: var(--font-size-xs);
  padding: 2px 6px;
  border-radius: 4px;
  text-transform: uppercase;
  font-weight: var(--font-weight-medium);
}

/* ========================================
   WEATHER COMPONENTS
   ======================================== */
.weather-forecast {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--spacing-md);
}

.weather-day {
  text-align: center;
  padding: var(--spacing-md);
  background: var(--color-white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
}

.weather-day__name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-sm);
}

.weather-day__temp {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-gray-800);
}

.weather-day__temp-range {
  font-size: var(--font-size-xs);
  color: var(--color-gray-500);
  margin-top: var(--spacing-xs);
}

/* ========================================
   DATA TABLES
   ======================================== */
.data-table {
  width: 100%;
  background: var(--color-white);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.data-table__header {
  background: var(--color-gray-50);
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--color-gray-200);
}

.data-table__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-800);
}

.data-table__content {
  overflow-x: auto;
}

.table {
  width: 100%;
  border-collapse: collapse;
}

.table th,
.table td {
  padding: var(--spacing-md);
  text-align: left;
  border-bottom: 1px solid var(--color-gray-200);
}

.table th {
  background: var(--color-gray-50);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-700);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.table td {
  font-size: var(--font-size-sm);
  color: var(--color-gray-800);
}

.table tr:hover {
  background: var(--color-gray-50);
}

/* ========================================
   CHARTS & GRAPHS
   ======================================== */
.chart-container {
  background: var(--color-white);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
}

.chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-lg);
}

.chart-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-800);
}

.chart-controls {
  display: flex;
  gap: var(--spacing-sm);
}

.chart-control {
  padding: var(--spacing-xs) var(--spacing-md);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--border-radius);
  background: var(--color-white);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: var(--transition-fast);
}

.chart-control:hover,
.chart-control--active {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

/* ========================================
   MAP COMPONENTS
   ======================================== */
.map-container {
  position: relative;
  background: var(--color-white);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.map-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.aqi-cluster {
  position: absolute;
  background: var(--color-white);
  border-radius: var(--border-radius);
  padding: var(--spacing-sm);
  box-shadow: var(--shadow-md);
  border: 2px solid var(--color-primary);
  min-width: 120px;
}

.aqi-cluster__title {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-700);
  margin-bottom: var(--spacing-xs);
}

.aqi-cluster__value {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
}

/* ========================================
   HEALTH GUIDANCE
   ======================================== */
.health-guidance {
  background: var(--color-white);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
}

.health-guidance__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-800);
  margin-bottom: var(--spacing-md);
}

.health-guidance__recommendations {
  list-style: none;
  margin-bottom: var(--spacing-lg);
}

.health-guidance__recommendation {
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-gray-200);
  font-size: var(--font-size-sm);
  color: var(--color-gray-700);
}

.health-guidance__recommendation:last-child {
  border-bottom: none;
}

.aqi-scale {
  display: flex;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-md);
}

.aqi-scale__item {
  flex: 1;
  text-align: center;
  padding: var(--spacing-xs);
  border-radius: 4px;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-white);
}

/* ========================================
   POLLUTANT CARDS
   ======================================== */
.pollutant-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-md);
}

.pollutant-card {
  background: var(--color-white);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-gray-200);
}

.pollutant-card__name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-sm);
}

.pollutant-card__value {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-gray-800);
  margin-bottom: var(--spacing-xs);
}

.pollutant-card__unit {
  font-size: var(--font-size-xs);
  color: var(--color-gray-500);
}

/* ========================================
   NEWS & ARTICLES
   ======================================== */
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.news-card {
  background: var(--color-white);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
}

.news-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.news-card__image {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.news-card__content {
  padding: var(--spacing-lg);
}

.news-card__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-800);
  margin-bottom: var(--spacing-sm);
  line-height: var(--line-height-tight);
}

.news-card__description {
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-md);
}

.news-card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--font-size-xs);
  color: var(--color-gray-500);
}

/* ========================================
   CALENDAR COMPONENT
   ======================================== */
.calendar-container {
  background: var(--color-white);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
}

.calendar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-lg);
}

.calendar-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-800);
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: var(--spacing-xs);
}

.calendar-day {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: var(--transition-fast);
}

.calendar-day:hover {
  background: var(--color-gray-100);
}

.calendar-day--current {
  background: var(--color-primary);
  color: var(--color-white);
}

.calendar-day--aqi-high {
  background: var(--aqi-unhealthy);
  color: var(--color-white);
}

.calendar-day--aqi-moderate {
  background: var(--aqi-moderate);
  color: var(--color-gray-800);
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 1200px) {
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .grid--4-cols {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 16px;
    --card-padding: 16px;
  }
  
  .header {
    padding: 0 var(--spacing-md);
  }
  
  .header__search {
    margin: 0 var(--spacing-md);
  }
  
  .grid--2-cols,
  .grid--3-cols,
  .grid--4-cols {
    grid-template-columns: 1fr;
  }
  
  .location-cards {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .location-card {
    min-width: auto;
  }
  
  .weather-forecast {
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  }
  
  .pollutant-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .news-grid {
    grid-template-columns: 1fr;
  }
  
  .calendar-grid {
    grid-template-columns: repeat(7, 1fr);
    gap: 2px;
  }
  
  .calendar-day {
    font-size: var(--font-size-xs);
  }
}

@media (max-width: 480px) {
  .header__nav {
    display: none;
  }
  
  .header__search {
    margin: 0;
  }
  
  .pollutant-grid {
    grid-template-columns: 1fr;
  }
  
  .aqi-dial {
    width: 150px;
    height: 150px;
  }
  
  .aqi-dial__value {
    font-size: var(--font-size-3xl);
  }
}

/* ========================================
   UTILITY CLASSES
   ======================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.font-bold { font-weight: var(--font-weight-bold); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-normal { font-weight: var(--font-weight-normal); }

.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }
.text-2xl { font-size: var(--font-size-2xl); }
.text-3xl { font-size: var(--font-size-3xl); }
.text-4xl { font-size: var(--font-size-4xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }
.mb-6 { margin-bottom: var(--spacing-2xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }
.mt-6 { margin-top: var(--spacing-2xl); }

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }
.p-5 { padding: var(--spacing-xl); }
.p-6 { padding: var(--spacing-2xl); }

.hidden { display: none; }
.block { display: block; }
.inline { display: inline; }
.inline-block { display: inline-block; }

.w-full { width: 100%; }
.h-full { height: 100%; }

.rounded { border-radius: var(--border-radius); }
.rounded-lg { border-radius: var(--border-radius-large); }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

.transition { transition: var(--transition-normal); }
.transition-fast { transition: var(--transition-fast); }
.transition-slow { transition: var(--transition-slow); }

/* ========================================
   ANIMATIONS
   ======================================== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
  from { transform: translateX(-100%); }
  to { transform: translateX(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.animate-fade-in {
  animation: fadeIn 0.5s ease-out;
}

.animate-slide-in {
  animation: slideIn 0.3s ease-out;
}

.animate-pulse {
  animation: pulse 2s infinite;
}

/* ========================================
   LOADING STATES
   ======================================== */
.loading {
  position: relative;
  overflow: hidden;
}

.loading::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  animation: loading 1.5s infinite;
}

@keyframes loading {
  0% { left: -100%; }
  100% { left: 100%; }
}

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

.focus-visible:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ========================================
   PRINT STYLES
   ======================================== */
@media print {
  .header,
  .location-cards,
  .chart-controls,
  .news-card__image {
    display: none;
  }
  
  .main-content {
    margin-top: 0;
  }
  
  .card {
    box-shadow: none;
    border: 1px solid var(--color-gray-300);
  }
  
  .section {
    padding: var(--spacing-md) 0;
  }
}