/* === BeadCraft - Linear/Notion inspired minimal UI === */

:root {
  --bg: #FFFFFF;
  --bg-secondary: #F7F7F7;
  --border: #E8E8E8;
  --text-primary: #1A1A1A;
  --text-secondary: #6B6B6B;
  --accent: #2563EB;
  --accent-hover: #1D4ED8;
  --accent-light: #EFF6FF;
  --danger: #EF4444;
  --btn-radius: 8px;
  --card-radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
  --transition: 0.15s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* === Header === */
.header {
  height: 64px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 100;
}

.header-logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.lang-switcher {
  display: flex;
  border: 1px solid var(--border);
  border-radius: var(--btn-radius);
  overflow: hidden;
}

.lang-btn {
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 600;
  border: none;
  background: var(--bg);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}
.lang-btn:not(:last-child) {
  border-right: 1px solid var(--border);
}
.lang-btn:hover {
  background: var(--bg-secondary);
}
.lang-btn.active {
  background: var(--accent);
  color: #fff;
}

.header-link {
  font-size: 13px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition);
}
.header-link:hover {
  color: var(--text-primary);
}

/* === Main Layout === */
.main-container {
  display: flex;
  min-height: calc(100vh - 64px);
}

/* Left Panel */
.left-panel {
  width: 340px;
  min-width: 340px;
  border-right: 1px solid var(--border);
  padding: 24px;
  overflow-y: auto;
  max-height: calc(100vh - 64px);
}

/* Right Panel */
.right-panel {
  flex: 1;
  padding: 24px;
  overflow-y: auto;
  max-height: calc(100vh - 64px);
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* === Upload Area === */
.upload-area {
  border: 2px dashed var(--border);
  border-radius: var(--card-radius);
  padding: 32px 20px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--bg);
}
.upload-area:hover {
  background: #F0F7FF;
  border-color: var(--accent);
}
.upload-area.dragging {
  background: #F0F7FF;
  border-color: var(--accent);
  border-style: solid;
}
.upload-area-icon {
  font-size: 32px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.upload-area-text {
  font-size: 14px;
  color: var(--text-secondary);
}
.upload-area-hint {
  font-size: 12px;
  color: #999;
  margin-top: 4px;
}

/* === Preview Image === */
.preview-section {
  margin-top: 16px;
}
.preview-image {
  max-width: 100%;
  max-height: 200px;
  border-radius: 8px;
  border: 1px solid var(--border);
  object-fit: contain;
  display: block;
  margin: 0 auto;
}

/* === Section === */
.section {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.section-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

/* === Tab Switch === */
.tab-group {
  display: flex;
  background: var(--bg-secondary);
  border-radius: 6px;
  padding: 2px;
  margin-bottom: 12px;
}
.tab-btn {
  flex: 1;
  padding: 6px 12px;
  font-size: 13px;
  border: none;
  background: transparent;
  border-radius: 4px;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all var(--transition);
  font-weight: 500;
}
.tab-btn.active {
  background: var(--bg);
  color: var(--text-primary);
  box-shadow: var(--shadow);
}

/* === Form Controls === */
.form-group {
  margin-bottom: 14px;
}
.form-label {
  display: block;
  font-size: 13px;
  color: var(--text-primary);
  margin-bottom: 6px;
  font-weight: 500;
}
.form-hint {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
}

select, input[type="range"] {
  width: 100%;
}

select {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--btn-radius);
  font-size: 14px;
  background: var(--bg);
  color: var(--text-primary);
  cursor: pointer;
  outline: none;
  transition: border-color var(--transition);
}
select:focus {
  border-color: var(--accent);
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  outline: none;
  margin: 8px 0;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid white;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

/* === Radio Group === */
.radio-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.radio-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  cursor: pointer;
}
.radio-item input[type="radio"] {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
}

/* === Checkbox === */
.checkbox-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  cursor: pointer;
}
.checkbox-item input[type="checkbox"] {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  border: none;
  border-radius: var(--btn-radius);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}
.btn-primary {
  background: var(--accent);
  color: white;
  width: 100%;
  padding: 12px;
  font-size: 15px;
}
.btn-primary:hover {
  background: var(--accent-hover);
}
.btn-primary:disabled {
  background: #93B4F0;
  cursor: not-allowed;
}
.btn-secondary {
  background: var(--bg);
  color: var(--text-primary);
  border: 1px solid var(--border);
  padding: 8px 16px;
  font-size: 13px;
}
.btn-secondary:hover {
  background: var(--bg-secondary);
}

.btn-group {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

/* === Spinner === */
.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* === Canvas Area === */
.canvas-container {
  position: relative;
  max-width: 600px;
  max-height: 600px;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}
.canvas-container canvas {
  max-width: 100%;
  max-height: 600px;
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: default;
}

.canvas-toolbar {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-bottom: 12px;
  width: 100%;
  max-width: 600px;
}

/* Edit mode toggle */
.toggle-btn {
  padding: 6px 14px;
  font-size: 12px;
  font-weight: 500;
  border: 1px solid var(--border);
  border-radius: var(--btn-radius);
  background: var(--bg);
  cursor: pointer;
  transition: all var(--transition);
  color: var(--text-secondary);
}
.toggle-btn.active {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
}

/* === Color Panel === */
.color-panel {
  margin-top: 20px;
  width: 100%;
  max-width: 600px;
}
.color-panel-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
}
.color-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.color-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  cursor: pointer;
  transition: all var(--transition);
  font-size: 12px;
  user-select: none;
}
.color-tag:hover {
  border-color: #CCC;
}
.color-tag.active {
  background: var(--accent-light);
  border-color: var(--accent);
}
.color-swatch {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  border: 1px solid rgba(0,0,0,0.1);
  flex-shrink: 0;
}
.color-code {
  font-weight: 600;
  color: var(--text-primary);
}
.color-name {
  color: var(--text-secondary);
}
.color-count {
  background: var(--bg-secondary);
  padding: 1px 6px;
  border-radius: 10px;
  font-size: 11px;
  color: var(--text-secondary);
}

.color-total {
  margin-top: 12px;
  font-size: 13px;
  color: var(--text-secondary);
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

/* === Color Picker Popover === */
.color-popover {
  position: fixed;
  z-index: 1000;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--card-radius);
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
  padding: 8px;
  max-height: 240px;
  overflow-y: auto;
  width: 200px;
}
.color-popover-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
  transition: background var(--transition);
}
.color-popover-item:hover {
  background: var(--bg-secondary);
}

/* === Toast === */
.toast-container {
  position: fixed;
  top: 80px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.toast {
  background: var(--text-primary);
  color: white;
  padding: 10px 20px;
  border-radius: var(--btn-radius);
  font-size: 13px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  animation: toastIn 0.3s ease;
  max-width: 300px;
}
.toast.error {
  background: var(--danger);
}
@keyframes toastIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* === Empty State === */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 400px;
  color: var(--text-secondary);
  text-align: center;
}
.empty-state-icon {
  font-size: 48px;
  margin-bottom: 16px;
  opacity: 0.3;
}
.empty-state-text {
  font-size: 15px;
}

/* === Responsive === */
@media (max-width: 768px) {
  .main-container {
    flex-direction: column;
  }
  .left-panel {
    width: 100%;
    min-width: unset;
    border-right: none;
    border-bottom: 1px solid var(--border);
    max-height: unset;
  }
  .right-panel {
    max-height: unset;
  }
}

/* === Scrollbar === */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: #DDD;
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: #BBB;
}

/* === Preset Buttons === */
.preset-group {
  display: flex;
  gap: 6px;
}
.preset-btn {
  flex: 1;
  padding: 7px 0;
  font-size: 13px;
  font-weight: 600;
  border: 1px solid var(--border);
  border-radius: var(--btn-radius);
  background: var(--bg);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
}
.preset-btn:hover {
  border-color: #CCC;
}
.preset-btn.active {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
}

/* === Hidden file input === */
.hidden-input {
  display: none;
}