:root {
  --primary: #1976d2;
  --accent: #ff5722;
  --bg: #f4f8fb;
  --card-bg: #fff;
  --nav-bg: #222e3a;
  --nav-hover: #1976d2;
  --text: #222;
  --border-radius: 14px;
  --shadow: 0 2px 8px rgba(0,0,0,0.07);
}
body {
  background: var(--bg);
  margin: 0;
  font-family: 'Segoe UI', Arial, sans-serif;
  color: var(--text);
}
nav {
  background: var(--nav-bg);
  box-shadow: var(--shadow);
  padding: 0 24px;
}
nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  height: 64px;
}
nav li {
  position: relative;
}
nav li a, .dropbtn {
  display: block;
  color: #fff;
  text-align: center;
  padding: 0 20px;
  line-height: 64px;
  text-decoration: none;
  font-weight: 500;
  transition: background 0.2s;
  border-radius: var(--border-radius);
}
nav li a:hover, .dropdown:hover .dropbtn {
  background: var(--nav-hover);
}
li.dropdown {
  display: block;
}
.dropdown-content {
  display: none;
  position: absolute;
  background: var(--card-bg);
  min-width: 180px;
  box-shadow: var(--shadow);
  border-radius: var(--border-radius);
  top: 64px;
  left: 0;
  z-index: 10;
  overflow: hidden;
}
.dropdown-content a {
  color: var(--text);
  padding: 14px 20px;
  text-decoration: none;
  display: block;
  background: var(--card-bg);
  transition: background 0.2s;
}
.dropdown-content a:hover {
  background: #f1f1f1;
}
.dropdown:hover .dropdown-content {
  display: block;
}
nav select#lang-switcher {
  margin-left: 18px;
  padding: 6px 12px;
  border-radius: var(--border-radius);
  border: 1px solid #ccc;
  font-size: 1rem;
  background: #fff;
  color: var(--primary);
  outline: none;
  transition: border 0.2s;
}
nav select#lang-switcher:focus {
  border: 2px solid var(--accent);
}
.logo-img {
  float: left;
  width: 64px;
  height: 64px;
  margin: 8px 24px 8px 0;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: var(--shadow);
  background: #fff;
}
.main-header {
  text-align: center;
  margin: 32px 0 12px 0;
  color: #fff;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: var(--border-radius);
  padding: 18px 0;
  font-size: 2.2rem;
  letter-spacing: 2px;
  box-shadow: var(--shadow);
  width: 90%;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}
.subtitle {
  text-align: center;
  color: var(--accent);
  font-size: 2rem;
  margin: 0 0 24px 0;
  font-weight: 600;
}
.hero-subtitle {
  text-align: center;
  margin: 0 0 24px 0;
  font-size: 1.1rem;
  color: #444;
}
.main-img {
  display: block;
  margin: 0 auto 24px auto;
  width: 100%;
  max-width: 700px;
  height: 320px;
  object-fit: cover;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}
.section {
  background: var(--card-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  margin: 32px auto;
  padding: 32px;
  max-width: 700px;
}
.section h3 {
  margin-top: 0;
  color: var(--primary);
}
.large-text {
  font-size: large;
}
.chart-section {
  background: var(--card-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  margin: 32px auto;
  padding: 32px;
  max-width: 700px;
  text-align: center;
}
#myChart {
  margin: 0 auto 16px auto;
  background: #f8fafc;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}
.city-cards {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
  margin: 32px auto;
  max-width: 1100px;
}
.city-card {
  background: var(--card-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  flex: 1 1 300px;
  min-width: 260px;
  max-width: 340px;
  padding: 24px;
  margin: 0;
  transition: transform 0.15s;
}
.city-card:hover {
  transform: translateY(-6px) scale(1.03);
  box-shadow: 0 6px 24px rgba(25, 118, 210, 0.15);
}
.city-card:focus {
  outline: 3px solid var(--primary);
  box-shadow: 0 0 0 4px rgba(25,118,210,0.15), var(--shadow);
}
.city-card h2 {
  margin-top: 0;
  color: var(--accent);
  font-size: 1.4rem;
}
.city-card p {
  margin-bottom: 0;
}
footer {
  background: var(--nav-bg);
  color: #fff;
  text-align: center;
  padding: 24px 0 12px 0;
  margin-top: 48px;
  font-size: 1rem;
}
@media (max-width: 900px) {
  .city-cards {
    flex-direction: column;
    align-items: center;
  }
}