:root {
  --bg-dark: #111827;
  --bg-card: #1f2937;
  --bg-input: #374151;
  --text-main: #f9fafb;
  --text-muted: #9ca3af;
  --primary: #10b981;
  --primary-hover: #059669;
  --border-color: #374151;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.5;
}

.hidden { display: none !important; }
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.text-center { text-align: center; }
.full-width { grid-column: 1 / -1; }
.w-full { width: 100%; }

/* Layouts */
.fullscreen-center {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 1rem;
}

/* Headers */
header {
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Buttons */
.btn {
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  border: none;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s;
}

.btn-primary {
  background-color: var(--primary);
  color: white;
}
.btn-primary:hover:not(:disabled) { background-color: var(--primary-hover); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-secondary {
  background-color: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}
.btn-secondary:hover { background-color: var(--bg-input); }

.btn-nav {
  background-color: transparent;
  color: var(--text-muted);
}
.btn-nav:hover { color: var(--text-main); }

/* Inputs */
.input-field {
  width: 100%;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  outline: none;
}
.input-field:focus { border-color: var(--primary); }

.textarea {
  min-height: 120px;
  resize: vertical;
}

.search-container { margin-bottom: 1rem; }
.results-text { color: var(--text-muted); font-size: 0.875rem; margin-bottom: 1.5rem; }

/* Boxes and Cards */
.modal-box {
  background-color: var(--bg-card);
  padding: 2rem;
  border-radius: 0.75rem;
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  width: 100%;
  max-width: 400px;
}

.validate-box { max-width: 800px; }

.upload-box {
  background-color: var(--bg-card);
  border: 2px dashed var(--border-color);
  padding: 3rem 1rem;
  border-radius: 0.75rem;
}
.status-text { color: var(--primary); font-weight: 600; }

.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 1.5rem;
}
@media (min-width: 600px) {
  .form-grid { grid-template-columns: 1fr 1fr; }
}

.actions-right {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
}

/* Supplier Cards */
.cards-grid {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  overflow: hidden;
}

.card-header {
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}
.card-header:hover { background-color: var(--bg-input); }
.card-header h3 { font-size: 1.125rem; }
.card-header .subtitle { color: var(--text-muted); font-size: 0.875rem; display: flex; align-items: center; gap: 0.25rem; }
.card-header .fragment { color: var(--text-main); font-size: 0.875rem; margin-top: 0.25rem; opacity: 0.8; }

.card-header .chevron { transition: transform 0.2s; }
.card-header.active .chevron { transform: rotate(180deg); }

.card-body {
  padding: 1rem;
  background-color: rgba(0, 0, 0, 0.2);
  border-top: 1px solid var(--border-color);
  font-size: 0.875rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
@media (min-width: 600px) {
  .grid-2 { grid-template-columns: 1fr 1fr; }
}