:root {
  --bg: hsl(0, 0%, 99%);
  --surface: hsl(0, 50%, 100%);
  --text: hsl(200, 15%, 8%);
  --muted: hsl(0, 25%, 97%);
  --shadow: 0 8px 28px rgba(24, 35, 44, 0.08);
  --ring: rgba(65, 138, 255, 0.4);
  --accent: #1f6aa5;
}

html[data-theme="dark"] {
  --bg: hsl(207, 26%, 17%);
  --surface: hsl(209, 23%, 22%);
  --text: hsl(0, 100%, 100%);
  --muted: hsl(0, 0%, 82%);
  --shadow: 0 10px 28px rgba(0, 0, 0, 0.38);
  --ring: rgba(153, 202, 255, 0.4);
  --accent: #8bc8ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Nunito Sans", sans-serif;
  background:
    radial-gradient(circle at 10% -5%, rgba(31, 106, 165, 0.18), transparent 40%),
    radial-gradient(circle at 92% 0%, rgba(245, 188, 52, 0.14), transparent 35%),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.topbar {
  background: var(--surface);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar-inner,
.app-shell {
  width: min(1200px, 92vw);
  margin: 0 auto;
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 78px;
}

.title {
  margin: 0;
  font-size: clamp(1.05rem, 2vw, 1.5rem);
  letter-spacing: -0.02em;
}

.theme-toggle,
.back-button,
.region-wrap select,
.search-wrap {
  border: 0;
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow);
  border-radius: 10px;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.62rem 0.9rem;
  cursor: pointer;
  font: inherit;
  font-weight: 600;
}

.icon {
  font-size: 1.1rem;
}

.app-shell {
  padding: 2.1rem 0 3rem;
}

.controls {
  display: flex;
  gap: 1.1rem;
  flex-wrap: wrap;
  justify-content: space-between;
}

.search-wrap {
  width: min(460px, 100%);
  display: flex;
  align-items: center;
  padding: 0.75rem 1.05rem;
  gap: 0.8rem;
}

.search-icon {
  color: var(--muted);
  font-size: 1rem;
}

.search-wrap input {
  width: 100%;
  border: 0;
  outline: none;
  background: transparent;
  color: var(--text);
  font: inherit;
}

.search-wrap input::placeholder {
  color: var(--muted);
}

.region-wrap select {
  width: min(220px, 100%);
  padding: 0.95rem 1rem;
  cursor: pointer;
  font: inherit;
}

.result-summary {
  margin: 1.3rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.country-grid {
  margin-top: 1.3rem;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(238px, 1fr));
  gap: 2.1rem;
}

.card {
  background: var(--surface);
  border-radius: 11px;
  overflow: hidden;
  box-shadow: var(--shadow);
  text-align: left;
  color: inherit;
  border: 0;
  cursor: pointer;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.card:hover,
.card:focus-visible {
  transform: translateY(-4px);
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.16);
  outline: none;
}

.card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  display: block;
}

.card-body {
  padding: 1.25rem 1.3rem 1.6rem;
  font-size: 0.87rem;
}

.card h2 {
  margin: 0 0 0.8rem;
  font-size: 1.08rem;
}

.card p {
  margin: 0.35rem 0;
}

.card b,
.detail-meta b {
  font-weight: 600;
}

.hidden {
  display: none;
}

.back-button {
  font: inherit;
  color: inherit;
  padding: 0.52rem 1.7rem;
  cursor: pointer;
  margin-bottom: 2rem;
}

.country-detail {
  display: grid;
  grid-template-columns: minmax(280px, 560px) minmax(280px, 1fr);
  gap: clamp(2rem, 4vw, 6rem);
  align-items: center;
}

.country-detail img {
  width: 100%;
  max-height: 390px;
  object-fit: cover;
  box-shadow: var(--shadow);
}

.country-detail h2 {
  margin-top: 0;
  margin-bottom: 1.4rem;
  font-size: clamp(1.55rem, 3vw, 2rem);
}

.detail-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(210px, 1fr));
  gap: 1.2rem;
}

.detail-meta {
  margin: 0;
}

.detail-meta p {
  margin: 0 0 0.55rem;
}

.borders {
  margin-top: 2rem;
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  align-items: center;
}

.border-tag {
  border: 0;
  background: var(--surface);
  color: inherit;
  box-shadow: var(--shadow);
  padding: 0.45rem 0.95rem;
  border-radius: 8px;
  font: inherit;
  cursor: pointer;
}

.border-tag:hover,
.border-tag:focus-visible,
.theme-toggle:focus-visible,
.back-button:focus-visible,
.region-wrap select:focus-visible,
.search-wrap input:focus-visible {
  outline: 3px solid var(--ring);
  outline-offset: 1px;
}

.empty {
  padding: 2rem 1rem;
  color: var(--muted);
  text-align: center;
  background: var(--surface);
  border-radius: 10px;
  box-shadow: var(--shadow);
}

@media (max-width: 860px) {
  .country-detail {
    grid-template-columns: 1fr;
    gap: 2.2rem;
  }

  .detail-columns {
    grid-template-columns: 1fr;
  }
}