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

:root {
  --bg-app: #f0f2f5;
  --bg-panel: #ffffff;
  --bg-canvas: #e8eaed;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-soft: #eef2ff;
  --accent-border: #c7d2fe;
  --danger: #ef4444;
  --danger-soft: #fef2f2;
  --success: #10b981;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08);
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --transition: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg-app);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  font-size: 13px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 自定义滚动条 */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: #d1d5db;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: #9ca3af;
}

/* ===== Header ===== */
.header {
  background: linear-gradient(135deg, #ffffff 0%, #fafbff 100%);
  border-bottom: 1px solid var(--border);
  height: 56px;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
  position: relative;
  z-index: 10;
}
.header-inner {
  max-width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}
.logo {
  font-size: 17px;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: -0.3px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.logo::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  background: linear-gradient(135deg, var(--accent) 0%, #818cf8 100%);
  border-radius: 2px;
  transform: rotate(45deg);
}
.logo span {
  color: var(--text-secondary);
  font-weight: 400;
  font-size: 14px;
}
.header-links {
  display: flex;
  gap: 20px;
}
.header-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  transition: color var(--transition);
  position: relative;
}
.header-link:hover {
  color: var(--accent);
}
.header-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition);
}
.header-link:hover::after {
  width: 100%;
}

/* ===== Main Container ===== */
.main-container {
  display: flex;
  flex: 1;
  overflow: hidden;
  min-height: 0;
}

/* ===== Panels ===== */
.panel {
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  flex-shrink: 0;
  padding: 16px 14px;
}
.panel-left {
  width: 232px;
}
.panel-right {
  width: 256px;
  border-right: none;
  border-left: 1px solid var(--border);
}

.panel-section {
  margin-bottom: 18px;
  padding: 12px;
  background: #fbfcfd;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition);
}
.panel-section:hover {
  border-color: var(--border-strong);
}
.panel-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  letter-spacing: 0.2px;
  text-transform: uppercase;
}
.panel-title::before {
  content: '';
  display: inline-block;
  width: 3px;
  height: 12px;
  background: var(--accent);
  border-radius: 2px;
  margin-right: 8px;
}

/* ===== Form ===== */
.form-group {
  margin-bottom: 10px;
}
.form-group label {
  display: block;
  font-size: 11px;
  color: var(--text-secondary);
  margin-bottom: 4px;
  font-weight: 500;
}
.form-group input[type="number"],
.form-group select,
.form-group input[type="text"]:not(.hex-input) {
  width: 100%;
  height: 32px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 0 10px;
  font-size: 13px;
  outline: none;
  background: #fff;
  transition: all var(--transition);
  color: var(--text-primary);
}
.form-group input[type="number"]:focus,
.form-group select:focus,
.form-group input[type="text"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.form-group input[type="color"] {
  width: 100%;
  height: 32px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 2px;
  cursor: pointer;
  outline: none;
  background: #fff;
  transition: border-color var(--transition);
}
.form-group input[type="color"]:hover {
  border-color: var(--accent);
}

/* checkbox */
.checkbox-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-primary);
  cursor: pointer;
  user-select: none;
}
.checkbox-label input[type="checkbox"] {
  width: 15px;
  height: 15px;
  cursor: pointer;
  accent-color: var(--accent);
}

/* HEX 颜色输入行 */
.color-input-row {
  display: flex;
  align-items: center;
  gap: 6px;
}
.color-input-row input[type="color"] {
  flex-shrink: 0;
  width: 36px;
  height: 32px;
  padding: 2px;
}
.color-input-row input[type="text"] {
  flex: 1;
  height: 32px;
  padding: 0 10px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  color: var(--text-primary);
  background: #fff;
  outline: none;
  transition: all var(--transition);
}
.color-input-row input[type="text"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.form-group input[type="range"] {
  width: calc(100% - 44px);
  vertical-align: middle;
  margin-right: 6px;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--border-strong);
  border-radius: 2px;
  outline: none;
}
.form-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  transition: transform var(--transition);
}
.form-group input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}
.form-group input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  border: none;
}
.range-with-spinner {
  display: flex;
  align-items: center;
  gap: 8px;
}
.range-with-spinner input[type="range"] {
  flex: 1;
  margin-right: 0;
}
.range-with-spinner input[type="number"] {
  width: 64px;
  height: 28px;
  padding: 0 8px;
  font-size: 12px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: #fff;
  outline: none;
  transition: all var(--transition);
  text-align: center;
}
.range-with-spinner input[type="number"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.range-with-spinner input[type="number"]::-webkit-inner-spin-button,
.range-with-spinner input[type="number"]::-webkit-outer-spin-button {
  opacity: 1;
  height: 24px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 7px 14px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--text-primary);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}
.btn:hover {
  background: #f9fafb;
  border-color: var(--text-tertiary);
}
.btn:active {
  transform: translateY(1px);
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 1px 2px rgba(79, 70, 229, 0.2);
}
.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: 0 2px 6px rgba(79, 70, 229, 0.3);
}
.btn-danger {
  color: var(--danger);
  border-color: var(--danger);
  background: #fff;
}
.btn-danger:hover {
  background: var(--danger-soft);
}
.btn-sm {
  padding: 5px 10px;
  font-size: 11px;
}
.btn-full {
  width: 100%;
  margin-top: 6px;
}
.btn-group {
  display: flex;
  gap: 6px;
  margin-bottom: 6px;
}
.btn-group .btn {
  flex: 1;
}

/* ===== Canvas ===== */
.canvas-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-canvas);
  background-image:
    linear-gradient(45deg, #dfe1e5 25%, transparent 25%),
    linear-gradient(-45deg, #dfe1e5 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #dfe1e5 75%),
    linear-gradient(-45deg, transparent 75%, #dfe1e5 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0;
  overflow: hidden;
  position: relative;
}
.canvas-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: #fff;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  flex-wrap: wrap;
  box-shadow: var(--shadow-sm);
}
.toolbar-label {
  font-size: 12px;
  color: var(--text-secondary);
  white-space: nowrap;
  font-weight: 500;
}
.toolbar-input {
  width: 72px;
  height: 28px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 0 8px;
  font-size: 12px;
  text-align: center;
  outline: none;
  background: #fff;
  transition: all var(--transition);
}
.toolbar-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.toolbar-sep {
  font-size: 12px;
  color: var(--text-tertiary);
}
.toolbar-divider {
  width: 1px;
  height: 20px;
  background: var(--border);
  margin: 0 4px;
}
.zoom-label {
  font-size: 12px;
  color: var(--text-secondary);
  min-width: 44px;
  text-align: center;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}
.canvas-container {
  flex: 1;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
#mainCanvas {
  background: #fff;
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(0, 0, 0, 0.04);
  border-radius: 4px;
  cursor: crosshair;
  max-width: 100%;
  max-height: 100%;
  display: block;
}

/* ===== Shape List ===== */
.shape-list {
  margin-top: 10px;
  max-height: 240px;
  overflow-y: auto;
  padding-right: 2px;
}
.shape-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 5px;
  cursor: pointer;
  font-size: 12px;
  transition: all var(--transition);
  background: #fff;
}
.shape-item:hover {
  background: #f9fafb;
  border-color: var(--border-strong);
}
.shape-item.active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 500;
}
.shape-item-name {
  display: flex;
  align-items: center;
  gap: 8px;
}
.btn-toggle-vis {
  padding: 3px 10px;
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  background: #fff;
  color: var(--text-secondary);
  font-size: 11px;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  flex-shrink: 0;
}
.btn-toggle-vis:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}
.shape-item.hidden-shape {
  opacity: 0.5;
}
.shape-icon {
  width: 14px;
  height: 14px;
  display: inline-block;
}
.shape-icon.circle {
  border-radius: 50%;
  border: 1.5px solid #6b7280;
}
.shape-icon.rect {
  border-radius: 2px;
  border: 1.5px solid #6b7280;
}

/* ===== Image ===== */
.img-crop-row {
  display: flex;
  gap: 6px;
}
.img-crop-row .form-group {
  flex: 1;
}
.shape-icon.text {
  width: 14px;
  height: 14px;
  display: inline-block;
  position: relative;
}
.shape-icon.text::after {
  content: 'T';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 11px;
  font-weight: 700;
  color: #6b7280;
  line-height: 1;
}

/* ===== Segment Selector ===== */
.segment-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}
.segment-tab {
  width: 32px;
  height: 26px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  color: var(--text-secondary);
  transition: all var(--transition);
}
.segment-tab:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.segment-tab.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 1px 3px rgba(79, 70, 229, 0.3);
}

/* ===== Footer ===== */
.footer {
  text-align: center;
  padding: 10px;
  font-size: 12px;
  color: var(--text-tertiary);
  background: #fff;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  font-weight: 500;
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(-10px);
  background: rgba(31, 41, 55, 0.95);
  color: #fff;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 500;
  z-index: 9999;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .panel-left { width: 200px; }
  .panel-right { width: 220px; }
}
@media (max-width: 700px) {
  .main-container { flex-direction: column; }
  .panel-left, .panel-right { width: 100%; max-height: 220px; border: none; border-bottom: 1px solid var(--border); }
  .panel-right { border-bottom: none; border-top: 1px solid var(--border); }
  .canvas-wrapper { height: 50vh; }
}