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

:root {
  --bg: #f5f1ed;
  --fg: #3d3d3d;
  --accent: #c77d58;
  --border: #9b8b7e;
  --input-bg: #ffffff;
  --hover-bg: #e8e3df;
  --shadow: rgba(61, 61, 61, 0.08);
}

[data-theme="dark"] {
  --bg: #2a2a2a;
  --fg: #e8e3df;
  --accent: #d4a78a;
  --border: #5a5a5a;
  --input-bg: #363636;
  --hover-bg: #3d3d3d;
  --shadow: rgba(232, 227, 223, 0.08);
}

body {
  font-family: "IBM Plex Mono", monospace;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 40px 20px;
}

header {
  border-bottom: 2px solid var(--border);
  padding-bottom: 20px;
  margin-bottom: 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

h1 {
  font-size: 48px;
  font-weight: 700;
  letter-spacing: -2px;
  line-height: 1;
}

.header-controls {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

button {
  font-family: "IBM Plex Mono", monospace;
  font-weight: 600;
  padding: 12px 24px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
  transition: all 0.2s;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

button:hover {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px var(--shadow);
}

button:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--bg);
  color: var(--accent);
  border-color: var(--accent);
}

a.back-home-link {
    text-decoration: none;
    color: inherit;
}

.filters {
  display: flex;
  gap: 15px;
  margin-bottom: 30px;
  flex-wrap: wrap;
  align-items: center;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 4px;
}

input,
select {
  font-family: "IBM Plex Mono", monospace;
  padding: 10px 15px;
  border: 1px solid var(--border);
  background: var(--input-bg);
  color: var(--fg);
  font-size: 14px;
  transition: all 0.2s;
  border-radius: 4px;
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--shadow);
}

.filter-label {
  font-weight: 600;
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: 1px;
}

.items-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 20px;
}

.item-card {
  border: 1px solid var(--border);
  padding: 20px;
  transition: all 0.3s;
  position: relative;
  animation: fadeIn 0.3s ease-out;
  border-radius: 4px;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.item-card:hover {
  box-shadow: 0 4px 16px var(--shadow);
  transform: translateY(-2px);
  border-color: var(--accent);
}

.item-subject {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
  word-break: break-word;
}

.item-category {
  display: inline-block;
  padding: 4px 12px;
  background: var(--accent);
  color: var(--bg);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 15px;
}

.item-details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 15px;
  font-size: 14px;
}

.detail-label {
  font-weight: 600;
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: 1px;
  opacity: 0.7;
}

.detail-value {
  font-weight: 600;
}

.item-actions {
  display: flex;
  gap: 10px;
  margin-top: 15px;
  border-top: 1px solid var(--border);
  padding-top: 15px;
}

.item-actions button {
  flex: 1;
  padding: 8px 16px;
  font-size: 12px;
}

/* Modal Styles */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  animation: modalFadeIn 0.2s;
  backdrop-filter: blur(4px);
}

@keyframes modalFadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 40px;
  max-width: 600px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  animation: modalSlideIn 0.3s;
  border-radius: 8px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

@keyframes modalSlideIn {
  from {
    transform: translateY(50px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.modal-header {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 30px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 15px;
  letter-spacing: -1px;
}

.form-group {
  margin-bottom: 25px;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: 1px;
}

.form-group input,
.form-group select {
  width: 100%;
}

.modal-actions {
  display: flex;
  gap: 15px;
  margin-top: 30px;
  border-top: 1px solid var(--border);
  padding-top: 30px;
}

.modal-actions button {
  flex: 1;
}

.category-manager {
  margin-top: 30px;
  padding-top: 30px;
  border-top: 1px solid var(--border);
}

.category-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 15px;
}

.category-tag {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 15px;
  border: 1px solid var(--border);
  background: var(--input-bg);
  border-radius: 4px;
}

.category-tag button {
  padding: 4px 8px;
  font-size: 10px;
  border: 1px solid var(--border);
}

.add-category {
  display: flex;
  gap: 10px;
  margin-top: 15px;
}

.add-category input {
  flex: 1;
}

.empty-state {
  text-align: center;
  padding: 80px 20px;
  border: 1px dashed var(--border);
  border-radius: 4px;
}

.empty-state-icon {
  font-size: 64px;
  margin-bottom: 20px;
  opacity: 0.3;
}

.empty-state-text {
  font-size: 18px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  opacity: 0.5;
}

.summary-section {
  margin-bottom: 30px;
  padding: 30px;
  border: 1px solid var(--border);
  background: var(--input-bg);
  border-radius: 8px;
}

.summary-header {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

.summary-item {
  padding: 20px;
  border: 1px solid var(--border);
  background: var(--bg);
  border-radius: 4px;
}

.summary-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 10px;
  opacity: 0.7;
}

.summary-value {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -1px;
}

.copy-btn {
  padding: 6px 12px;
  font-size: 11px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.copy-btn:hover {
  background: var(--accent);
  color: var(--bg);
}

.copy-feedback {
  display: inline-block;
  margin-left: 10px;
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  opacity: 0;
  transition: opacity 0.3s;
}

.copy-feedback.show {
  opacity: 1;
}

.item-price-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 5px;
}

@media (max-width: 768px) {
  h1 {
    font-size: 32px;
  }

  .modal-content {
    padding: 20px;
  }

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

  .summary-value {
    font-size: 24px;
  }
}