:root {
  --tool-bg-base: #f4f4f5;
  --tool-bg-surface: rgba(255, 255, 255, 0.92);
  --tool-bg-surface-strong: #ffffff;
  --tool-bg-muted: #f4f4f5;
  --tool-border: #e4e4e7;
  --tool-border-strong: #d4d4d8;
  --tool-text: #18181b;
  --tool-subtle: #71717a;
  --tool-accent: #0ea5e9;
  --tool-accent-strong: #0284c7;
  --tool-accent-soft: #e0f2fe;
  --tool-danger: #ef4444;
  --tool-success: #10b981;
  --tool-radius-sm: 12px;
  --tool-radius: 20px;
  --tool-radius-full: 9999px;
  --tool-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --tool-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --tool-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --tool-bg-base: #09090b;
    --tool-bg-surface: rgba(24, 24, 27, 0.92);
    --tool-bg-surface-strong: #18181b;
    --tool-bg-muted: #27272a;
    --tool-border: #27272a;
    --tool-border-strong: #3f3f46;
    --tool-text: #fafafa;
    --tool-subtle: #a1a1aa;
    --tool-accent: #38bdf8;
    --tool-accent-strong: #7dd3fc;
    --tool-accent-soft: rgba(56, 189, 248, 0.15);
    --tool-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5);
    --tool-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --tool-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body.tool-body {
  margin: 0;
  min-height: 100vh;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--tool-bg-base);
  color: var(--tool-text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior-y: contain;
  -webkit-tap-highlight-color: transparent;
}

.tool-shell {
  width: min(1180px, calc(100% - 24px));
  margin: 0 auto;
  padding: 14px 0 28px;
}

.tool-topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
  padding: 14px 16px;
  border: 1px solid var(--tool-border);
  border-radius: var(--tool-radius);
  background: var(--tool-bg-surface);
  backdrop-filter: blur(16px);
  box-shadow: var(--tool-shadow-sm);
}

.tool-topbar a {
  color: var(--tool-subtle);
  text-decoration: none;
  font-weight: 700;
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
}

.tool-titlebar {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.tool-titlebar h1 {
  margin: 0;
  font-size: clamp(1.05rem, 2.2vw, 1.45rem);
  letter-spacing: -0.02em;
}

.tool-titlebar p {
  margin: 0;
  color: var(--tool-subtle);
  font-size: 0.84rem;
}

.tool-grid {
  display: grid;
  grid-template-columns: minmax(280px, 360px) minmax(0, 1fr);
  gap: 18px;
}

.tool-panel {
  background: var(--tool-bg-surface);
  backdrop-filter: blur(16px);
  border: 1px solid var(--tool-border);
  border-radius: var(--tool-radius);
  box-shadow: var(--tool-shadow-sm);
}

.tool-sidebar,
.tool-main {
  padding: 18px;
}

.tool-section + .tool-section {
  margin-top: 16px;
}

.tool-section h2,
.tool-section h3 {
  margin: 0 0 10px;
  font-size: 0.92rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--tool-subtle);
}

.tool-note,
.tool-muted {
  margin: 0;
  color: var(--tool-subtle);
  font-size: 0.88rem;
}

.tool-stack {
  display: grid;
  gap: 10px;
}

.tool-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.tool-row > * {
  flex: 1 1 0;
}

.tool-label {
  display: grid;
  gap: 6px;
  font-size: 0.84rem;
  color: var(--tool-subtle);
  font-weight: 600;
}

.tool-input,
.tool-select,
.tool-textarea,
.tool-color {
  width: 100%;
  min-height: 42px;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid var(--tool-border);
  background: var(--tool-bg-surface-strong);
  color: var(--tool-text);
  font: inherit;
}

.tool-input:focus,
.tool-select:focus,
.tool-textarea:focus,
.tool-color:focus {
  outline: none;
  border-color: var(--tool-accent);
  box-shadow: 0 0 0 3px var(--tool-accent-soft);
}

.tool-textarea {
  min-height: 180px;
  resize: vertical;
}

.tool-color {
  padding: 4px;
  min-height: 42px;
}

.tool-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 14px;
  border: none;
  border-radius: 14px;
  background: var(--tool-bg-muted);
  color: var(--tool-text);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

.tool-button:hover {
  transform: translateY(-1px);
}

.tool-button-primary {
  background: var(--tool-accent);
  color: #fff;
}

.tool-button-primary:hover {
  background: var(--tool-accent-strong);
}

.tool-button-danger {
  background: rgba(239, 68, 68, 0.12);
  color: var(--tool-danger);
}

.tool-chip {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  background: var(--tool-accent-soft);
  color: var(--tool-accent);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  -webkit-user-select: none;
  user-select: none;
}

.tool-card-list {
  display: grid;
  gap: 12px;
}

.tool-card {
  padding: 14px;
  border-radius: 18px;
  border: 1px solid var(--tool-border);
  background: var(--tool-bg-muted);
  box-shadow: var(--tool-shadow-sm);
}

.tool-card h3 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.tool-card p {
  margin: 0;
  color: var(--tool-subtle);
}

.tool-canvas-wrap {
  overflow: auto;
  border: 1px solid var(--tool-border);
  border-radius: 18px;
  background: var(--tool-bg-surface-strong);
  overscroll-behavior: none;
}

.tool-canvas {
  display: block;
  max-width: 100%;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
}

.tool-status {
  min-height: 22px;
  color: var(--tool-subtle);
  font-size: 0.86rem;
}

.tool-divider {
  height: 1px;
  background: var(--tool-border);
  margin: 10px 0;
}

.tool-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.tool-table th,
.tool-table td {
  border-bottom: 1px solid var(--tool-border);
  padding: 8px 6px;
  text-align: left;
  vertical-align: top;
}

.tool-table th {
  color: var(--tool-subtle);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

@media (pointer: coarse) {
  .tool-topbar a,
  .tool-button,
  .tool-chip,
  .tool-card {
    -webkit-user-select: none;
    user-select: none;
  }
}

@media (max-width: 860px) {
  body.tool-fixed-mobile {
    overflow: hidden;
  }

  .tool-fixed-mobile .tool-shell {
    min-height: 100vh;
  }

  .tool-fixed-mobile .tool-sidebar,
  .tool-fixed-mobile .tool-main {
    overflow: auto;
    -webkit-overflow-scrolling: touch;
  }

  .tool-shell {
    width: calc(100% - 16px);
    padding-bottom: 20px;
  }

  .tool-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .tool-sidebar,
  .tool-main {
    padding: 14px;
  }

  .tool-row {
    flex-direction: column;
  }

  .tool-topbar {
    position: static;
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
    padding: 12px 14px;
  }

  .tool-sidebar,
  .tool-main {
    padding: 14px;
  }

  .tool-button {
    width: 100%;
  }

  .tool-titlebar h1 {
    font-size: 1.02rem;
  }

  .tool-titlebar p,
  .tool-note,
  .tool-muted,
  .tool-status {
    font-size: 0.82rem;
  }

  .tool-input,
  .tool-select,
  .tool-textarea,
  .tool-color {
    min-height: 46px;
  }
}

@media (max-width: 520px) {
  .tool-shell {
    width: calc(100% - 12px);
    padding-top: 6px;
  }

  .tool-topbar,
  .tool-panel {
    border-radius: 18px;
  }
}