:root {
  --bg-color: hsl(0, 0%, 98%);
  --element-color: hsl(0, 0%, 100%);
  --text-color: hsl(200, 15%, 8%);
  --input-color: hsl(0, 0%, 52%);
  --shadow: 0 0 10px rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] {
  --bg-color: hsl(207, 26%, 17%);
  --element-color: hsl(209, 23%, 22%);
  --text-color: hsl(0, 0%, 100%);
  --shadow: 0 0 10px rgba(0, 0, 0, 0.2);
}

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

body {
  font-family: 'Nunito Sans', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: all 0.3s ease;
}

.container {
  max-width: 1300px;
  margin: 0 auto;
  padding: 0 40px;
}

/* Header */
.header {
  background-color: var(--element-color);
  box-shadow: var(--shadow);
  padding: 25px 0;
  margin-bottom: 40px;
}

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

.theme-toggle {
  background: none;
  border: none;
  color: var(--text-color);
  font-weight: 600;
  cursor: pointer;
}

/* Controls (Search & Filter) */
.controls {
  display: flex;
  justify-content: space-between;
  margin-bottom: 40px;
  flex-wrap: wrap;
  gap: 20px;
}

.search-box input {
  background-color: var(--element-color);
  color: var(--text-color);
  border: none;
  box-shadow: var(--shadow);
  padding: 15px 30px;
  width: 100%;
  max-width: 450px;
  border-radius: 5px;
}

.filter-box select {
  background-color: var(--element-color);
  color: var(--text-color);
  border: none;
  padding: 15px;
  border-radius: 5px;
  box-shadow: var(--shadow);
}

/* Countries Grid */
.countries-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 60px;
}

.country-card {
  background-color: var(--element-color);
  border-radius: 5px;
  overflow: hidden;
  box-shadow: var(--shadow);
  cursor: pointer;
}

.country-card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.card-info { padding: 25px; }
.card-info h3 { margin-bottom: 15px; }
.card-info p { margin-bottom: 5px; font-size: 14px; }

/* Detail View */
.back-btn {
  background-color: var(--element-color);
  color: var(--text-color);
  border: none;
  padding: 10px 30px;
  box-shadow: var(--shadow);
  margin-bottom: 60px;
  cursor: pointer;
  border-radius: 5px;
}

.detail-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.detail.layout {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  gap: 80px;
  width: 100%;
}

.detail-flag img {
  width: 100%;
  height: auto;
  max-height: 400px;
  max-width: 560px;
  box-shadow: var(--shadow);
}

.detail-flag {
  flex: 1;  /* Takes up half the space */
  width: 100%;
}

.detail-info {
  flex: 1;  /* Takes up the other half */
  width: 100%;
}

.detail-info h2 {
  font-size: 32px;
  margin-bottom: 30px;
  font-weight: 800;
}

.info-columns {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 40px;
}

.info-columns .col p {
  margin-bottom: 12px;
  font-size: 16px;
}

/* Border Countries */
.borders {
  display: flex;
  align-items: flex-start;
  gap: 15px;
  flex-wrap: wrap;  /* to allow buttons to wrap to new line */
}

.border-list {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.detail-content img { width: 100%; box-shadow: var(--shadow); }

/* adaptive block */
@media (max-width: 768px) {
  .detail-content { grid-template-columns: 1fr; }
  .container { padding: 0 20px; }
    .detail-layout {
    flex-direction: column; /* Flag at the top, text at the bottom */
    align-items: flex-start;
    gap: 40px;
}

  .info-columns {
    flex-direction: column; /* Features in one column */
    gap: 30px;
  }

  .detail-flag img {
    max-height: 300px;
  }
}