:root {
  --page: #eef2f7;
  --surface: #f7f9fc;
  --surface-2: #fbfcfe;
  --panel: #f4f7fb;
  --line: #cfd9e7;
  --line-strong: #9eb2ca;
  --text: #1f2a38;
  --muted: #65778e;
  --primary: #2877c7;
  --primary-soft: #dbe9f8;
  --shadow-sm: 0 1px 2px rgba(32, 55, 87, 0.03), 0 2px 6px rgba(32, 55, 87, 0.02);
  --radius-xl: 18px;
  --radius-lg: 14px;
  --radius-md: 10px;
  --ui-font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --ui-control-font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
}

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--page);
  color: var(--text);
  font-family: var(--ui-font);
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.22s ease, border-color 0.22s ease, color 0.22s ease;
}

html {
  --theme-burst-x: calc(100% - 30px);
  --theme-burst-y: 28px;
}

* {
  box-sizing: border-box;
}

button,
input,
select {
  font: inherit;
  font-family: var(--ui-font);
}

body {
  overflow: hidden;
  position: relative;
  transition: background-color 0.24s ease, color 0.24s ease;
}

body::after {
  content: "";
  position: fixed;
  inset: -18vmax;
  pointer-events: none;
  opacity: 0;
  background: radial-gradient(circle at var(--theme-burst-x) var(--theme-burst-y), color-mix(in srgb, var(--primary) 16%, transparent) 0, color-mix(in srgb, var(--primary) 10%, transparent) 9%, transparent 34%);
  transform: scale(0.82);
  z-index: 999;
}

html.theme-switching body::after {
  animation: theme-burst 0.48s cubic-bezier(0.22, 0.8, 0.24, 1);
}

@keyframes theme-burst {
  0% { opacity: 0; transform: scale(0.82); }
  35% { opacity: 0.6; }
  100% { opacity: 0; transform: scale(1.08); }
}

.app {
  display: grid;
  grid-template-columns: 332px minmax(0, 1fr);
  height: 100dvh;
}

.sidebar {
  padding: 10px 10px 8px;
  background: linear-gradient(180deg, #eff3f8 0%, #ebf0f6 100%);
  border-right: 1px solid var(--line);
  overflow-y: hidden;
  display: flex;
  flex-direction: column;
  gap: 7px;
  transition: background 0.24s ease, border-color 0.24s ease;
}

.sidebar::-webkit-scrollbar {
  width: 6px;
}

.sidebar::-webkit-scrollbar-thumb {
  background: rgba(108, 130, 158, 0.28);
  border-radius: 999px;
}

.sidebar-head {
  min-height: 34px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
}

.brand-mark {
  display: flex;
  align-items: center;
}

.dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
}

.dot + .dot {
  margin-left: -2px;
}

.dot-a { background: #3d8bff; }
.dot-b { background: #47b96d; }
.dot-c { background: #eb5b56; }

.brand {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.icon-btn {
  width: 30px;
  height: 30px;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, transform 0.28s cubic-bezier(0.22, 0.8, 0.24, 1);
}

.icon-btn:hover {
  background: rgba(40, 119, 199, 0.08);
  color: var(--text);
}

.icon-btn svg {
  width: 16px;
  height: 16px;
  transform-origin: center;
  transition: transform 0.28s cubic-bezier(0.22, 0.8, 0.24, 1), opacity 0.2s ease;
}

html.theme-switching .icon-btn {
  transform: rotate(18deg) scale(0.96);
}

html.theme-switching .icon-btn svg {
  transform: rotate(90deg) scale(0.82);
}

[data-ui-theme="light"] .icon-moon { display: none; }
[data-ui-theme="dark"] .icon-sun { display: none; }

.upload-card,
.panel-card,
.text-preview-card,
.preview-stage {
  border: 1px solid var(--line);
  background: rgba(251, 252, 254, 0.82);
  box-shadow: var(--shadow-sm);
  transition: background-color 0.24s ease, border-color 0.24s ease, box-shadow 0.24s ease, color 0.24s ease;
}

.upload-card {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 11px;
  border-radius: 14px;
  cursor: pointer;
  text-decoration: none;
}

.upload-card:hover {
  border-color: var(--line-strong);
  background: #f8fbff;
}

.upload-ico {
  width: 36px;
  height: 36px;
  border-radius: 11px;
  background: #dceaf9;
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.upload-ico svg {
  width: 22px;
  height: 22px;
}

.upload-copy {
  min-width: 0;
}

.upload-title {
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 2px;
}

.upload-sub {
  font-size: 11px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.panel-card {
  border-radius: 14px;
  padding: 10px 11px;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}

.panel-head-inline {
  align-items: center;
}

.panel-title {
  font-size: 13px;
  font-weight: 700;
}

.inline-switches {
  display: flex;
  align-items: center;
  gap: 8px;
}

.mini-switch {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
}

.mini-switch input {
  position: absolute;
  opacity: 0;
}

.mini-track {
  position: relative;
  width: 38px;
  height: 21px;
  border-radius: 999px;
  background: #d7e1ee;
  border: 1px solid #b9cadd;
}

.mini-track::after {
  content: "";
  position: absolute;
  top: 1px;
  left: 1px;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
  transition: transform 0.18s ease;
}

.mini-switch input:checked + .mini-track {
  background: var(--primary);
  border-color: var(--primary);
}

.mini-switch input:checked + .mini-track::after {
  transform: translateX(17px);
}

.field-grid.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.compact-gap {
  margin-bottom: 6px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.field-label {
  font-size: 10px;
  font-weight: 700;
  color: var(--muted);
}

.field-label-top {
  margin-top: 2px;
  margin-bottom: 8px;
}

.field input,
.field select {
  width: 100%;
  height: 34px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: #fdfefe;
  padding: 0 10px;
  color: var(--text);
  outline: none;
  font-family: var(--ui-control-font);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1;
  -webkit-font-smoothing: antialiased;
}

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

.field input::placeholder {
  font-weight: 500;
  color: color-mix(in srgb, var(--muted) 78%, transparent);
}

.field select option {
  font-family: var(--ui-control-font);
  font-size: 16px;
  font-weight: 600;
}

.field-select {
  position: relative;
}

.select-wrap {
  position: relative;
  display: block;
}

.field select {
  appearance: none;
  -webkit-appearance: none;
  padding-right: 32px;
  font-family: var(--ui-control-font);
  text-rendering: geometricPrecision;
}

.select-arrow {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  width: 12px;
  height: 8px;
  color: var(--muted);
  pointer-events: none;
}

.slider-row {
  display: block;
  margin-top: 8px;
}

.slider-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 6px;
  font-size: 12px;
  font-weight: 700;
}

.slider-header span:first-child {
  color: var(--text);
}

.slider-header span:last-child {
  color: var(--primary);
  background: #d9e9fa;
  border-radius: 999px;
  padding: 2px 9px;
  min-width: 48px;
  text-align: center;
}

input[type="range"] {
  width: 100%;
  height: 4px;
  border-radius: 999px;
  background: #bfd0e4;
  appearance: none;
  -webkit-appearance: none;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  width: 20px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid #dbe8f6;
  background: var(--primary);
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border: 2px solid #dbe8f6;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
}

.theme-swatches {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
}

.swatch {
  height: 26px;
  border-radius: 10px;
  border: 2px solid transparent;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.7);
  cursor: pointer;
}

.swatch.is-active {
  border-color: rgba(40, 61, 93, 0.28);
}

.auto { background: linear-gradient(135deg, #d7dee8 0%, #e9ddd6 100%); }
.soft-rose { background: #e7d6d9; }
.mist-blue { background: #d5dbe6; }
.soft-apricot { background: #ead5c0; }
.soft-sand { background: #ddd9d2; }

.chip-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 8px;
}

.color-chip-card {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  padding: 8px 10px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: #f8fbff;
}

.color-chip {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: #d0d0d0;
  border: 1px solid rgba(120, 132, 150, 0.25);
  flex-shrink: 0;
}

.chip-copy {
  min-width: 0;
}

.chip-copy span {
  display: block;
  font-size: 10px;
  color: var(--muted);
  margin-bottom: 2px;
}

.chip-copy strong {
  display: block;
  font-size: 12px;
  line-height: 1.2;
  word-break: break-all;
}

.side-meta {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.text-preview-card {
  border-radius: 14px;
  padding: 7px 9px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.meta-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 0 3px rgba(40, 119, 199, 0.12);
  flex-shrink: 0;
}

.text-preview-copy span {
  display: block;
  font-size: 10px;
  color: var(--muted);
  margin-bottom: 2px;
}

.text-preview-copy strong {
  display: block;
  font-size: 13px;
}

.action-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.btn {
  height: 34px;
  border: 0;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 0.22s ease, color 0.22s ease, transform 0.14s ease;
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn-tonal {
  background: #dce8f6;
  color: #1d4f84;
}

.btn-filled {
  background: #8fb0d5;
  color: #fff;
}

.btn-filled:not(:disabled) {
  background: var(--primary);
}

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

.preview-panel {
  min-width: 0;
  padding: 12px 12px 12px 10px;
  background: linear-gradient(180deg, #eef2f7 0%, #e9eef5 100%);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.preview-head {
  min-height: 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.preview-title-wrap {
  display: flex;
  align-items: center;
  gap: 9px;
}

.preview-title {
  font-size: 13px;
  font-weight: 700;
}

.preview-meta {
  font-size: 11px;
  color: var(--muted);
}

.preview-stage {
  position: relative;
  flex: 1;
  min-height: 0;
  border-radius: 20px;
  background: #f3f6fa;
  padding: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
}

#previewCanvas {
  display: block;
  max-width: 100%;
  max-height: calc(100vh - 80px);
  width: auto;
  height: auto;
  border-radius: 14px;
}

.placeholder {
  position: absolute;
  inset: 10px;
  border-radius: 18px;
  color: #7f8ea2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.placeholder.is-hidden {
  display: none;
}

.placeholder-icon {
  width: 52px;
  height: 52px;
}

.placeholder-icon svg {
  width: 100%;
  height: 100%;
}

.placeholder-text {
  font-size: 12px;
  font-weight: 600;
}

[data-ui-theme="dark"] {
  --page: #151a20;
  --surface: #1e252d;
  --surface-2: #222b35;
  --panel: #202932;
  --line: #334150;
  --line-strong: #50657b;
  --text: #edf2f8;
  --muted: #a9b7c8;
  --primary: #6aa9ea;
  --primary-soft: rgba(106, 169, 234, 0.18);
  --shadow-sm: none;
}

[data-ui-theme="dark"] .sidebar,
[data-ui-theme="dark"] .preview-panel {
  background: #171d24;
}

[data-ui-theme="dark"] .upload-card,
[data-ui-theme="dark"] .panel-card,
[data-ui-theme="dark"] .text-preview-card,
[data-ui-theme="dark"] .preview-stage,
[data-ui-theme="dark"] .color-chip-card {
  background: rgba(31, 39, 48, 0.96);
}

[data-ui-theme="dark"] .field input,
[data-ui-theme="dark"] .field select {
  background: #1a222b;
  color: var(--text);
}

[data-ui-theme="dark"] .select-arrow {
  color: var(--muted);
}

[data-ui-theme="dark"] .btn-tonal {
  background: #273747;
  color: #dce9f8;
}

[data-ui-theme="dark"] .btn-filled {
  background: #507fb2;
}

@media (max-height: 860px) and (min-width: 981px) {
  body {
    overflow: auto;
  }

  .app {
    height: auto;
    min-height: 100dvh;
  }

  .sidebar {
    overflow-y: auto;
  }
}

@media (max-width: 980px) {
  body {
    overflow: auto;
  }

  .app {
    grid-template-columns: 1fr;
    height: auto;
  }

  .sidebar {
    height: auto;
    overflow: visible;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .preview-panel {
    min-height: 60vh;
    padding-top: 14px;
  }

  #previewCanvas {
    max-height: none;
  }
}

@media (max-width: 640px) {
  .field-grid.two-col,
  .chip-grid,
  .action-row,
  .theme-swatches {
    grid-template-columns: 1fr;
  }

  .inline-switches {
    flex-wrap: wrap;
    justify-content: flex-end;
  }
}