:root {
  --bg-main: #0c0e14;
  --bg-sidebar: #131620;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(99, 102, 241, 0.5);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --primary: #6366f1;
  --font-sans: 'Plus Jakarta Sans', 'Noto Sans SC', -apple-system, sans-serif;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  height: 100vh;
  overflow: hidden;
}

.app-layout {
  display: flex;
  height: 100vh;
}

/* 预览舞台 */
.preview-stage {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  background: radial-gradient(circle at 50% 40%, #1a1d29 0%, #0c0e14 100%);
  padding: 30px;
}

.stage-nav {
  position: absolute;
  top: 24px;
  left: 28px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand-pill {
  display: flex;
  flex-direction: column;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  padding: 6px 14px;
  border-radius: 12px;
  backdrop-filter: blur(12px);
}

.project-title {
  font-size: 15px;
  font-weight: 800;
  background: linear-gradient(135deg, #a5b4fc, #f472b6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 0.04em;
}

.studio-sub {
  font-size: 10px;
  color: #94a3b8;
  font-weight: 600;
}

.preset-indicator {
  font-size: 12px;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.03);
  padding: 8px 14px;
  border-radius: 20px;
  border: 1px solid var(--border-subtle);
}

/* 画布视口：保证所见即所得 */
.canvas-viewport {
  max-height: 82vh;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 35px 80px rgba(0, 0, 0, 0.65), 0 0 0 1px rgba(255, 255, 255, 0.08);
  border-radius: 36px;
  overflow: hidden;
  background-color: #111;
  transition: all 0.3s ease;
}

#mainCanvas {
  max-height: 82vh;
  width: auto;
  height: auto;
  display: block;
  cursor: pointer;
  transition: transform 0.2s ease;
}

#mainCanvas:hover {
  filter: brightness(1.02);
}

.stage-actions {
  position: absolute;
  bottom: 24px;
}

.export-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 28px;
  border-radius: 9999px;
  font-size: 14.5px;
  font-weight: 700;
  color: #ffffff;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  border: none;
  cursor: pointer;
  box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4);
  transition: all 0.25s ease;
}

.export-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 40px rgba(99, 102, 241, 0.55);
}

/* 控制侧边栏 */
.control-sidebar {
  width: 370px;
  background-color: var(--bg-sidebar);
  border-left: 1px solid var(--border-subtle);
  padding: 24px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
}

.header-titles h2 {
  font-size: 17px;
  font-weight: 700;
}

.studio-credit {
  font-size: 11px;
  color: #818cf8;
  font-weight: 600;
}

.version-tag {
  font-size: 11px;
  background: rgba(99, 102, 241, 0.12);
  color: #a5b4fc;
  padding: 3px 8px;
  border-radius: 6px;
  font-weight: 600;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.group-title {
  font-size: 11.5px;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.title-with-extra {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.subtext {
  font-size: 11px;
  color: var(--text-muted);
}

/* 预设卡片 */
.preset-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.preset-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 10px 12px;
  text-align: left;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 3px;
  transition: all 0.2s ease;
}

.preset-card:hover {
  background: rgba(255, 255, 255, 0.06);
}

.preset-card.active {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.12);
}

.preset-card .p-name {
  font-size: 12.5px;
  font-weight: 600;
  color: #ffffff;
}

.preset-card .p-res {
  font-size: 10px;
  color: var(--text-muted);
}

/* 上传框 */
.upload-dropzone {
  border: 1.5px dashed rgba(255, 255, 255, 0.15);
  border-radius: 14px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  background: rgba(255, 255, 255, 0.02);
}

.upload-dropzone:hover {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.05);
}

.drop-text span {
  font-size: 13px;
  font-weight: 600;
  display: block;
}

.drop-text small {
  font-size: 11px;
  color: var(--text-muted);
}

.image-adjust-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

.image-adjust-row input[type="range"] {
  width: 60%;
}

/* 分段按钮 */
.segmented-control {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  background: rgba(255, 255, 255, 0.04);
  padding: 4px;
  border-radius: 10px;
  border: 1px solid var(--border-subtle);
}

.seg-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 600;
  padding: 8px 0;
  border-radius: 7px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.seg-btn.active {
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
}

/* 输入框 */
.input-field {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.input-label {
  font-size: 11px;
  color: var(--text-muted);
}

.input-field input {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 9px 12px;
  color: #ffffff;
  font-size: 13px;
  outline: none;
}

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

/* 调色盘 */
.palette-swatches {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}

.swatch-item {
  aspect-ratio: 1;
  border-radius: 8px;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.swatch-item:hover, .swatch-item.active {
  transform: scale(1.12);
  border-color: #ffffff;
}

.color-picker-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

.color-picker-item input[type="color"] {
  -webkit-appearance: none;
  border: none;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  cursor: pointer;
  background: none;
}