* {
  box-sizing: border-box;
}

:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  --text-primary: #212529;
  --text-secondary: #6c757d;
  --text-muted: #adb5bd;
  --border-color: #dee2e6;
  --accent: #4a6fa5;
  --accent-light: #6b8cba;
  --accent-background: #e7f0fa;
  --unknown: #dc3545;
  --unknown-bg: #fff5f5;
  --root: #28a745;
  --root-bg: #f0fff4;
  --affix: #6f42c1;
  --affix-bg: #f8f4ff;
  --sidebar-width: 360px;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-primary);
  background: var(--bg-secondary);
}

/* Layout */
.app-container {
  display: flex;
  height: 100vh;
}

.main-panel {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
}

.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-primary);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Upload Screen */
.upload-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
}

.upload-screen h1 {
  margin: 0 0 8px 0;
  font-size: 28px;
  font-weight: 600;
}

.upload-screen p {
  margin: 0 0 32px 0;
  color: var(--text-secondary);
}

.upload-zones {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

.upload-zone {
  width: 200px;
  padding: 24px;
  border: 2px dashed var(--border-color);
  border-radius: 8px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.upload-zone:hover {
  border-color: var(--accent);
  background: var(--bg-secondary);
}

.upload-zone.loaded {
  border-color: var(--root);
  border-style: solid;
  background: var(--root-bg);
}

.upload-zone.dragging {
  border-color: var(--accent);
  border-style: solid;
  background: var(--bg-secondary);
}

.upload-zone input {
  display: none;
}

.upload-zone-label {
  font-weight: 500;
  margin-bottom: 4px;
}

.upload-zone-status {
  font-size: 12px;
  color: var(--text-secondary);
}

.upload-zone.loaded .upload-zone-status {
  color: var(--root);
}

/* Header */
.header {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 24px;
  margin: -24px -24px 24px -24px;
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.header h1 {
  margin: 0;
  font-size: 20px;
  font-weight: 600;
}

.header-meta {
  font-size: 12px;
  color: var(--text-secondary);
}

.search-input {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}

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

.reset-btn {
  padding: 6px 12px;
  background: var(--bg-tertiary);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
  color: var(--text-secondary);
}

.reset-btn:hover {
  background: var(--border-color);
}

/* Alignment Lines */
.alignment-line {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 16px;
  max-width: 800px;
  margin: 0 auto 12px;
}

.alignment-line:last-child {
  margin-bottom: 0;
}

.source-line {
  color: var(--text-primary);
  font-size: 15px;
  margin-bottom: 8px;
  line-height: 1.6;
}

.target-line {
  color: var(--text-secondary);
  line-height: 1.6;
  font-size: 13px;
  margin-bottom: 16px;
}

.target-words {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.target-word {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  padding: 6px 10px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.15s;
}

.target-word:hover {
  filter: brightness(0.95);
}

.target-word.selected {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.target-word.unknown {
  background: var(--unknown-bg);
}

.target-word.known {
  background: var(--root-bg);
}

.target-word.mixed {
  background: var(--affix-bg);
}

.target-word.patched {
  background: var(--accent-background);
}

.target-word-form {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
}

.target-word.unknown .target-word-form {
  color: var(--unknown);
}

.target-word-gloss {
  font-size: 11px;
  color: var(--text-secondary);
  max-width: 120px;
  text-align: center;
  line-height: 1.3;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.line-number {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

/* Sidebar */
.sidebar-header {
  padding: 16px;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-header h2 {
  margin: 0 0 12px 0;
  font-size: 16px;
  font-weight: 600;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 12px;
  background: var(--bg-tertiary);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text-secondary);
}

.back-btn:hover {
  background: var(--border-color);
  color: var(--text-primary);
}

.back-btn::before {
  content: "\2190";
}

.sidebar-search {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 13px;
  outline: none;
}

.sidebar-search:focus {
  border-color: var(--accent);
}

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
}

.sidebar-section {
  margin-bottom: 24px;
}

.sidebar-section:last-child {
  margin-bottom: 0;
}

.sidebar-section-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

/* Selected Word Display */
.selected-word-display {
  background: var(--bg-secondary);
  border-radius: 6px;
  padding: 12px;
  margin-bottom: 16px;
}

.selected-word-form {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.morpheme-breakdown {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.morpheme-tag {
  font-size: 12px;
  padding: 2px 6px;
  border-radius: 3px;
}

.morpheme-tag.prefix,
.morpheme-tag.suffix {
  background: var(--affix-bg);
  color: var(--affix);
}

.morpheme-tag.root {
  background: var(--root-bg);
  color: var(--root);
}

.morpheme-tag.unknown {
  background: var(--unknown-bg);
  color: var(--unknown);
}

/* Entry Cards */
.entry-card {
  background: var(--bg-secondary);
  border-radius: 6px;
  padding: 10px 12px;
  margin-bottom: 8px;
  cursor: pointer;
  transition: background 0.15s;
}

.entry-card:hover {
  background: var(--bg-tertiary);
}

.entry-card.patched {
  border-left: 3px solid var(--accent);
}

.entry-card:last-child {
  margin-bottom: 0;
}

.entry-card.entry-unknown {
  background: var(--unknown-bg);
  border-left: 3px solid var(--unknown);
}

.entry-card.entry-unknown-patched {
  background: var(--bg-secondary);
  border-left: 3px solid var(--accent);
}

.entry-form {
  font-weight: 600;
  margin-bottom: 2px;
}

.entry-gloss {
  color: var(--text-secondary);
  font-size: 13px;
}

.entry-meta {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
}

.entry-type {
  display: inline-block;
  padding: 1px 5px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  font-size: 10px;
  text-transform: uppercase;
  margin-right: 6px;
}

/* Empty states */
.empty-state {
  text-align: center;
  padding: 32px 16px;
  color: var(--text-secondary);
}

.empty-state-icon {
  font-size: 32px;
  margin-bottom: 8px;
  opacity: 0.5;
}

/* Stats */
.stats {
  display: flex;
  gap: 16px;
  margin: 8px 0;
}

.stat {
  font-size: 12px;
  color: var(--text-secondary);
}

.stat-value {
  font-weight: 600;
  color: var(--text-primary);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal {
  background: var(--bg-primary);
  border-radius: 8px;
  width: 400px;
  max-width: 90vw;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px;
  border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: var(--text-secondary);
  padding: 0;
  line-height: 1;
}

.modal-close:hover {
  color: var(--text-primary);
}

.modal-body {
  padding: 16px;
}

.modal-field {
  display: block;
  margin-bottom: 12px;
}

.modal-field:last-child {
  margin-bottom: 0;
}

.modal-field span {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.modal-field input,
.modal-field textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 14px;
  font-family: inherit;
  outline: none;
}

.modal-field input:focus,
.modal-field textarea:focus {
  border-color: var(--accent);
}

.modal-field textarea {
  min-height: 80px;
  resize: vertical;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 16px;
  border-top: 1px solid var(--border-color);
}

.btn-secondary,
.btn-primary {
  padding: 8px 16px;
  border-radius: 4px;
  font-size: 14px;
  cursor: pointer;
  border: none;
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

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

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

.btn-primary:hover {
  background: var(--accent-light);
}

/* Search container with clear button */
.search-container {
  position: relative;
  display: flex;
  align-items: center;
}

.search-container input {
  flex: 1;
  padding-right: 32px;
}

.clear-btn {
  position: absolute;
  right: 8px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  border-radius: 50%;
  z-index: 10;
}

.icon-clear {
  width: 16px;
  height: 16px;
  background-color: currentColor;
  -webkit-mask-image: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNCIgaGVpZ2h0PSIyNCIgdmlld0JveD0iMCAwIDI0IDI0IiBmaWxsPSJub25lIiBzdHJva2U9ImJsYWNrIiBzdHJva2Utd2lkdGg9IjIiIHN0cm9rZS1saW5lY2FwPSJyb3VuZCIgc3Ryb2tlLWxpbmVqb2luPSJyb3VuZCI+PGxpbmUgeDE9IjE4IiB5MT0iNiIgeDI9IjYiIHkyPSIxOCI+PC9saW5lPjxsaW5lIHgxPSI2IiB5MT0iNiIgeDI9IjE4IiB5Mj0iMTgiPjwvbGluZT48L3N2Zz4=');
  mask-image: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNCIgaGVpZ2h0PSIyNCIgdmlld0JveD0iMCAwIDI0IDI0IiBmaWxsPSJub25lIiBzdHJva2U9ImJsYWNrIiBzdHJva2Utd2lkdGg9IjIiIHN0cm9rZS1saW5lY2FwPSJyb3VuZCIgc3Ryb2tlLWxpbmVqb2luPSJyb3VuZCI+PGxpbmUgeDE9IjE4IiB5MT0iNiIgeDI9IjYiIHkyPSIxOCI+PC9saW5lPjxsaW5lIHgxPSI2IiB5MT0iNiIgeDI9IjE4IiB5Mj0iMTgiPjwvbGluZT48L3N2Zz4=');
  -webkit-mask-size: contain;
  mask-size: contain;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  display: inline-block;
}

.clear-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}