/* General Colors and Base Layout Configurations */
:root {
  --bg-color: #f4f6f9;
  --panel-bg: #ffffff;
  --text-main: #2c3e50;
  --text-muted: #7f8c8d;
  --accent-color: #3498db;
  --accent-hover: #2980b9;
  --error-color: #e74c3c;
  --border-color: #e2e8f0;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  --border-radius: 12px;
}

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

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
}

/* Header UI Components Architecture */
header {
  background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
  color: white;
  text-align: center;
  padding: 2.5rem 1rem;
  box-shadow: var(--shadow);
}

header h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  letter-spacing: 1px;
}

header p {
  font-size: 1.1rem;
  opacity: 0.9;
}

/* Main Core Layout Architecture */
main {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 1rem;
}

/* Booking Control Functional Layouts */
.booking-controls {
  background-color: var(--panel-bg);
  padding: 1.5rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}

.date-picker {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.input-group {
  flex: 1;
  min-width: 200px;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.input-group label {
  font-weight: 600;
  color: var(--text-main);
  font-size: 0.95rem;
}

.input-group input {
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 1rem;
  color: var(--text-main);
  outline: none;
  transition: border-color 0.2s;
}

.input-group input:focus {
  border-color: var(--accent-color);
}

/* Status Panel Text Summary Alerts */
.summary-section {
  margin-bottom: 1.5rem;
  padding: 0.75rem 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

#total-nights-summary {
  font-weight: 600;
  color: var(--accent-color);
}

.error-text {
  color: var(--error-color);
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

.hidden {
  display: none !important;
}

/* Filter Navigation Action System */
.filter-group {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 0.6rem 1.2rem;
  border: 1px solid var(--border-color);
  background-color: var(--panel-bg);
  color: var(--text-main);
  border-radius: 20px;
  cursor: pointer;
  font-weight: 500;
  transition: all 0.2s ease;
}

.filter-btn:hover {
  background-color: #f8fafc;
  border-color: var(--text-muted);
}

.filter-btn.active {
  background-color: var(--accent-color);
  color: white;
  border-color: var(--accent-color);
}

/* Grid-Layout System Architecture */
.hotel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

/* Individual Hotel UI Display Elements */
.hotel-card {
  background-color: var(--panel-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border-color);
}

.hotel-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
}

.hotel-image {
  background-color: #edf2f7;
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
}

.card-img {
    width: 100%;
    height: 100%;
    object-fit: cover; /* Crops the image perfectly to fill the 160px height without stretching */
    object-position: center;
}

.hotel-info {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex-grow: 1;
}

.hotel-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-main);
}

.hotel-location {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.hotel-price {
  font-weight: 600;
  color: var(--text-main);
}

.total-price {
  margin-top: auto;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--border-color);
  color: #2e7d32;
  font-size: 0.95rem;
}

/* Dynamic Fallback Elements Styling */
.no-results {
  grid-column: 1 / -1;
  text-align: center;
  padding: 3rem;
  color: var(--text-muted);
  background-color: var(--panel-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}

/* Media Query Responsive Adjustments */
@media (max-width: 600px) {
  header h1 {
    font-size: 2rem;
  }
  .date-picker {
    flex-direction: column;
    gap: 1rem;
  }
  .input-group {
    width: 100%;
  }
}