:root {
  --bg-primary: #0a0c14;
  --bg-card: #121624;
  --accent-purple: #8b5cf6;
  --accent-cyan: #06b6d4;
  --accent-green: #10b981;
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --danger: #ef4444;
  --border-color: #1e293b;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--accent-cyan);
  text-decoration: none;
  text-shadow: 0 0 10px rgba(6, 182, 212, 0.4);
}

nav a {
  color: var(--text-main);
  text-decoration: none;
  margin-left: 1rem;
  transition: color 0.2s;
}

nav a:hover {
  color: var(--accent-purple);
}

.btn {
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
  color: #fff;
  padding: 0.5rem 1.2rem;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  font-weight: 600;
  text-decoration: none;
  display: inline-block;
  transition: transform 0.1s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-danger {
  background: var(--danger);
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 2rem auto;
  flex: 1;
}

.grid-anuncios {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
}

.card-anuncio {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  transition: border-color 0.2s;
}

.card-anuncio:hover {
  border-color: var(--accent-purple);
}

.card-anuncio img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.card-body {
  padding: 1rem;
}

.card-body h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.card-price {
  color: var(--accent-green);
  font-size: 1.25rem;
  font-weight: bold;
  margin-top: 0.5rem;
}

/* Chat e Formulários Responsivos */
.chat-box, .form-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 1.5rem;
  border-radius: 8px;
}

.form-group {
  margin-bottom: 1.2rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.4rem;
  color: var(--text-muted);
}

.form-group input, .form-group textarea, .form-group select {
  width: 100%;
  padding: 0.75rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: 6px;
}

@media (max-width: 768px) {
  header {
    flex-direction: column;
    align-items: flex-start;
  }
}