:root {
  color-scheme: light dark;
  --bg: #0f1419;
  --surface: #1a2332;
  --text: #e8eef5;
  --muted: #9aa8bc;
  --accent: #5b9bd5;
  --accent-hover: #7eb3e8;
  --border: #2d3a4d;
  --danger: #c45c5c;
  font-family: "DM Sans", system-ui, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(1200px 600px at 20% -10%, #1e3a5f 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #2a1f3d 0%, transparent 50%), var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.site-header,
.site-footer {
  border-color: var(--border);
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
  background: rgba(15, 20, 25, 0.75);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.02em;
}

.nav {
  display: flex;
  gap: 1.25rem;
  align-items: center;
}

.nav a {
  font-weight: 500;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

.hero {
  padding: 2.5rem 0 1rem;
}

.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

.lead {
  color: var(--muted);
  max-width: 42ch;
  margin: 0 0 2rem;
}

.grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.card:hover {
  transform: translateY(-2px);
  border-color: #3d4f66;
}

.card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: #111820;
}

.card-body {
  padding: 1rem 1.1rem 1.25rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card-body h2 {
  margin: 0 0 0.35rem;
  font-size: 1.1rem;
}

.price {
  font-weight: 600;
  color: var(--accent-hover);
  margin-bottom: 0.5rem;
}

.card-body p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  flex: 1;
}

.card-footer {
  padding: 0 1.1rem 1.1rem;
}

.btn {
  display: inline-block;
  padding: 0.55rem 1rem;
  border-radius: 8px;
  font-weight: 600;
  border: 1px solid var(--border);
  background: #243044;
  color: var(--text);
  cursor: pointer;
  font-size: 0.95rem;
}

.btn:hover {
  background: #2c3a52;
}

.btn-primary {
  background: var(--accent);
  border-color: transparent;
  color: #0a0e14;
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: #0a0e14;
}

.page-title {
  margin: 0 0 1rem;
}

.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.detail {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
}

@media (min-width: 720px) {
  .detail {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
  }
}

.detail img {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #111820;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
}

.tag {
  font-size: 0.8rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: #243044;
  border: 1px solid var(--border);
  color: var(--muted);
}

.form {
  max-width: 520px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem 1.35rem;
}

.form label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.35rem;
  font-size: 0.9rem;
}

.form input,
.form textarea {
  width: 100%;
  padding: 0.55rem 0.65rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #111820;
  color: var(--text);
  margin-bottom: 1rem;
  font: inherit;
}

.form textarea {
  min-height: 100px;
  resize: vertical;
}

.hint {
  font-size: 0.85rem;
  color: var(--muted);
  margin: -0.5rem 0 1rem;
}

.warn {
  color: var(--danger);
  font-size: 0.85rem;
  margin: -0.5rem 0 1rem;
}

.site-footer {
  padding: 1.25rem 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}

.error-page {
  text-align: center;
  padding: 3rem 1rem;
}

.error-page h1 {
  font-size: 4rem;
  margin: 0;
  opacity: 0.35;
}