/* Base typography and layout */
:root {
  --primary: #7c4d00;
  --secondary: #c58f39;
  --accent: #f4e2c1;
  --dark: #1f1f1f;
  --light: #fffdf8;
  font-family: 'Segoe UI', Tahoma, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background: var(--light);
  color: var(--dark);
  line-height: 1.6;
}

img {
  max-width: 100%;
  display: block;
  border-radius: 8px;
}

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

header {
  background: rgba(0, 0, 0, 0.65);
  color: #fff;
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: 99;
  backdrop-filter: blur(6px);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

nav a {
  color: #fff;
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  transition: background 0.2s;
}

nav a:hover,
nav a:focus {
  background: rgba(255, 255, 255, 0.18);
}

.hero {
  min-height: 65vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
  background: linear-gradient(rgba(15, 15, 15, 0.6), rgba(15, 15, 15, 0.6)),
    url('https://www.airpano.ru/files/china-great-wall/images/image2.jpg')
      center/cover;
  padding: 4rem 1rem;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin-bottom: 1rem;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 3rem 1rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.5rem;
}

.card {
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 12px 25px rgba(0, 0, 0, 0.08);
  padding: 1.5rem;
  border-top: 4px solid var(--secondary);
}

.highlight {
  background: linear-gradient(135deg, #fff8ed, #f6e7c8);
}

.section-title {
  font-size: 1.8rem;
  margin-bottom: 1.2rem;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

footer {
  background: #111;
  color: #ddd;
  text-align: center;
  padding: 2rem 1rem;
}

.timeline {
  border-left: 4px solid var(--secondary);
  padding-left: 1.5rem;
}

.timeline article {
  margin-bottom: 1.5rem;
}

.fact-box {
  background: var(--accent);
  border-left: 5px solid var(--primary);
  padding: 1rem;
  border-radius: 6px;
  margin-top: 1rem;
}

.section-grid {
  display: grid;
  gap: 2rem;
}

.section-grid article {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  align-items: center;
}

.info-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}

.info-table th,
.info-table td {
  border: 1px solid #ddd;
  padding: 0.75rem;
  text-align: left;
}

.info-table th {
  background: var(--accent);
}

.gallery-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.gallery-grid figure {
  position: relative;
  overflow: hidden;
  border-radius: 8px;
}

.gallery-grid figcaption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0.7rem;
  background: rgba(0, 0, 0, 0.5);
  color: #fff;
  font-size: 0.9rem;
}

form {
  background: #fff;
  padding: 2rem;
  border-radius: 10px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
  max-width: 600px;
}

label {
  display: block;
  margin-top: 1rem;
  font-weight: 600;
}

input,
textarea,
select {
  width: 100%;
  padding: 0.8rem;
  margin-top: 0.4rem;
  border-radius: 6px;
  border: 1px solid #ccc;
}

button,
.btn {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  padding: 0.8rem 1.4rem;
  border: none;
  border-radius: 5px;
  margin-top: 1rem;
  cursor: pointer;
  transition: opacity 0.2s;
}

button:hover,
.btn:hover {
  opacity: 0.85;
}

.summary-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 2rem;
}

.summary-table th,
.summary-table td {
  border: 1px solid #ddd;
  padding: 0.75rem;
}

.summary-table th {
  background: var(--accent);
  text-align: left;
}

@media (max-width: 640px) {
  header {
    position: static;
  }

  nav ul {
    justify-content: center;
  }

  form {
    padding: 1.25rem;
  }
}