:root {
  --bg: #f3f6fb;
  --sidebar: #ffffff;
  --panel: #ffffff;
  --panel-soft: #f8fbff;
  --line: #dbe3ee;
  --line-strong: #c8d4e3;
  --text: #1f2a37;
  --muted: #6b7280;
  --accent: #1e88ff;
  --accent-2: #4ea7ff;
  --accent-ink: #ffffff;
  --shadow: 0 12px 30px rgba(25, 51, 84, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", sans-serif;
  background: linear-gradient(180deg, #f8fbff 0%, var(--bg) 100%);
  color: var(--text);
  font-size: 13px;
}

button,
input,
select {
  font: inherit;
}

.app-shell {
  display: grid;
  grid-template-columns: 255px 1fr;
  min-height: 100vh;
}

.sidebar {
  border-right: 1px solid var(--line);
  background: var(--sidebar);
  padding: 14px 12px;
  overflow-y: auto;
}

.workspace {
  padding: 14px;
  display: grid;
  gap: 14px;
}

.brand {
  display: grid;
  gap: 8px;
  padding: 2px 4px 8px;
}

.brand-logo {
  width: 68px;
  max-width: 100%;
  display: block;
  border-radius: 10px;
  background: #ffffff;
  padding: 2px;
}

.brand h1,
.panel h2,
.workspace-header h2,
.preview-head h2,
.preview-card h3 {
  margin: 0;
}

.brand p {
  margin: 0;
  font-size: 10px;
  line-height: 1.45;
  color: var(--muted);
}

.panel h2 {
  font-size: 14px;
  line-height: 1.2;
  color: var(--text);
}

.workspace-header h2,
.preview-head h2 {
  font-size: 16px;
  color: var(--text);
}

.preview-card h3,
.pane-head h3 {
  font-size: 13px;
  color: var(--text);
}

.workspace-header p,
.preview-head p,
.hint,
.panel label:not(.file-input) > span:first-child {
  color: var(--muted);
}

.mini-note {
  margin: 10px 2px 0;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.45;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 12px;
  margin-top: 10px;
  box-shadow: 0 6px 18px rgba(42, 63, 95, 0.04);
}

.panel label {
  display: grid;
  gap: 6px;
  margin-top: 8px;
}

.quick-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
  margin-top: 8px;
}

.quick-actions button {
  margin-top: 0;
}

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

.panel select,
.panel input[type="text"],
.panel input[type="number"] {
  min-height: 34px;
  border-radius: 9px;
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--text);
  padding: 0 9px;
}

.file-input {
  position: relative;
  overflow: hidden;
  display: grid;
}

.file-input span,
button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 7px 10px;
  border-radius: 9px;
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--text);
  cursor: pointer;
  font-size: 11px;
  font-weight: 600;
}

.file-input input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

button.primary,
.file-input span {
  background: linear-gradient(135deg, #1e7df2, #4a9fff);
  color: var(--accent-ink);
  border-color: transparent;
  box-shadow: 0 8px 18px rgba(30, 136, 255, 0.22);
}

button:hover,
.file-input span:hover {
  border-color: var(--line-strong);
}

button.primary:hover,
.file-input span:hover {
  filter: brightness(0.98);
}

button {
  width: 100%;
  margin-top: 6px;
}

.list {
  margin-top: 6px;
  display: grid;
  gap: 6px;
  max-height: 140px;
  overflow-y: auto;
}

.list-item {
  border: 1px solid var(--line);
  background: var(--panel-soft);
  border-radius: 10px;
  padding: 8px 9px;
  display: grid;
  gap: 3px;
  cursor: pointer;
  text-align: left;
}

.list-item strong {
  font-size: 11px;
  line-height: 1.35;
  color: var(--text);
}

.list-item.active {
  border-color: rgba(30, 136, 255, 0.45);
  box-shadow: 0 0 0 3px rgba(30, 136, 255, 0.12);
  background: #ffffff;
}

.list-item-head {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: start;
}

.list-item-copy {
  display: grid;
  gap: 3px;
  min-width: 0;
}

.icon-btn {
  width: 24px;
  min-width: 24px;
  height: 24px;
  min-height: 24px;
  margin-top: 0;
  padding: 0;
  border-radius: 7px;
  background: #ffffff;
  border: 1px solid var(--line);
  color: #7b8794;
  font-size: 13px;
  line-height: 1;
  box-shadow: none;
}

.icon-btn:hover {
  border-color: rgba(30, 136, 255, 0.45);
  color: var(--accent);
}

.list-item small {
  color: var(--muted);
  font-size: 9px;
  line-height: 1.35;
}

.canvas-panel,
.preview-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 14px;
  box-shadow: var(--shadow);
}

.workspace-header,
.preview-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
  margin-bottom: 10px;
}

.canvas-wrap,
.preview-card {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 10px;
}

.canvas-wrap {
  display: grid;
  align-content: start;
  min-height: 470px;
  gap: 10px;
}

.editor-preview-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
  gap: 12px;
}

.preview-wrap {
  position: sticky;
  top: 24px;
}

.pane-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
}

.pane-head h3 {
  margin: 0;
}

.pane-head p {
  margin: 0;
  color: var(--muted);
  font-size: 11px;
}

.hint-bottom {
  margin-top: 10px;
  font-size: 10px;
  line-height: 1.5;
}

canvas {
  width: min(100%, 760px);
  height: auto;
  display: block;
  border-radius: 14px;
  background: #f6f9fd;
  border: 1px solid var(--line);
}

.preview-grid {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(320px, 1fr);
  gap: 16px;
}

.preview-grid-single {
  grid-template-columns: 1fr;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 10px;
  max-height: 560px;
  overflow-y: auto;
}

.result-card {
  background: var(--panel-soft);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 9px;
  display: grid;
  gap: 8px;
}

.result-card strong {
  color: var(--text);
}

.result-card img {
  width: 100%;
  border-radius: 10px;
  display: block;
  border: 1px solid var(--line);
}

.result-card a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 700;
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 10px;
}

.checkbox input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

@media (max-width: 1120px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    border-right: none;
    border-bottom: 1px solid var(--line);
  }

  .preview-grid {
    grid-template-columns: 1fr;
  }

  .editor-preview-grid {
    grid-template-columns: 1fr;
  }

  .preview-wrap {
    position: static;
  }
}