@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --primary-color: #3f72af;
  --secondary-color: #112d4e;
  --bg-color: #f9fbfd;
  --surface-color: #ffffff;
  --text-main: #2c3e50;
  --text-light: #7f8c8d;
  --border-color: #dbe2ef;
  --danger-color: #e74c3c;
  --success-color: #2ecc71;
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

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

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

/* Header */
header {
  background-color: var(--surface-color);
  box-shadow: var(--shadow-sm);
  padding: 1rem 0;
  margin-bottom: 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
  letter-spacing: 1px;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-main);
  margin-left: 1.5rem;
  font-weight: 500;
  transition: color 0.3s ease;
}

.nav-links a:hover, .nav-links a.active {
  color: var(--primary-color);
}

.btn {
  display: inline-block;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  border: none;
  font-family: inherit;
  font-size: 0.9rem;
}

.btn-primary {
  background-color: var(--primary-color);
  color: white;
}

.btn-primary:hover {
  background-color: var(--secondary-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: transparent;
  border: 1px solid var(--primary-color);
  color: var(--primary-color);
}

.btn-secondary:hover {
  background-color: var(--primary-color);
  color: white;
}

.btn-danger {
  background-color: #fee2e2;
  color: var(--danger-color);
}

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

/* Forms */
.card {
  background: var(--surface-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 2rem;
  margin-bottom: 2rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--secondary-color);
  font-size: 0.9rem;
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 1rem;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(63, 114, 175, 0.2);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

/* Data Tables / Grid */
.stone-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
}

.stone-card {
  background: var(--surface-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
}

.stone-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.stone-card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background-color: #f1f5f9;
}

.stone-card-content {
  padding: 1.5rem;
  flex-grow: 1;
}

.stone-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--secondary-color);
  margin-bottom: 0.5rem;
}

.stone-details {
  list-style: none;
  font-size: 0.9rem;
  color: var(--text-light);
  margin-bottom: 1rem;
}

.stone-details li {
  margin-bottom: 0.25rem;
  display: flex;
  justify-content: space-between;
}
.stone-details li span.val {
  font-weight: 600;
  color: var(--text-main);
}

.stone-card-actions {
  display: flex;
  gap: 0.5rem;
  padding: 1rem 1.5rem;
  background-color: #f8fafc;
  border-top: 1px solid var(--border-color);
}

.stone-card-actions button {
  flex: 1;
}

/* View Page Details Table (like screenshot) */
.view-container {
  display: flex;
  gap: 2rem;
  max-width: 1000px;
  margin: 2rem auto;
  align-items: flex-start;
  padding: 0 1rem;
  width: 100%;
}

.media-viewer {
  flex: 1;
  background: #e2e8f0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.media-viewer img, .media-viewer iframe, .media-viewer video {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.details-table-wrapper {
  flex: 1;
  background: var(--surface-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.details-header {
  background-color: var(--primary-color);
  color: white;
  text-align: center;
  padding: 1rem;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 1px;
}

.details-table {
  width: 100%;
  border-collapse: collapse;
}

.details-table tr:nth-child(even) {
  background-color: #f1f5f9;
}

.details-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
}

.details-table td:first-child {
  font-weight: 600;
  color: var(--primary-color);
  width: 40%;
  text-transform: uppercase;
  font-size: 0.85rem;
}

.details-table td:last-child {
  font-weight: 700;
  color: var(--secondary-color);
  word-break: break-word;
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--success-color);
  color: white;
  padding: 1rem 1.5rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  z-index: 1000;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-light);
}
.empty-state h3 {
  color: var(--secondary-color);
  margin-bottom: 1rem;
}

/* --- RESPONSIVE DESIGN --- */

@media (max-width: 992px) {
  /* Tablets */
  .container {
    padding: 1.5rem;
  }
  
  .stone-grid {
    gap: 1.5rem;
  }
}

@media (max-width: 768px) {
  /* Mobile Landscape & Small Tablets */
  .header-content {
    flex-direction: column;
    gap: 1rem;
    padding: 0 1rem;
  }
  
  .nav-links {
    display: flex;
    justify-content: center;
    width: 100%;
  }

  .nav-links a {
    margin: 0 0.5rem;
    font-size: 0.95rem;
  }
  
  .view-container {
    flex-direction: column;
    margin: 1rem auto;
    gap: 1.5rem;
    padding: 0 1rem;
    width: 100%;
    align-items: stretch;
  }

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

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

  .card {
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  /* Mobile Portrait */
  .container {
    padding: 1rem;
  }

  .stone-grid {
    grid-template-columns: 1fr;
  }
  
  .stone-card-actions {
    flex-wrap: wrap;
  }
  
  .stone-card-actions > * {
    flex: 1 1 45% !important; /* Force wrapping on very small screens */
    margin-bottom: 0.5rem;
  }

  .nav-links {
    flex-direction: column;
    gap: 0.5rem;
  }

  .nav-links a {
    margin: 0;
    width: 100%;
    text-align: center;
    padding: 0.6rem 0;
  }

  .details-table td {
    padding: 0.5rem;
    font-size: 0.9rem;
  }
}