:root, [data-theme="light"] {
  color-scheme: light;
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-strong: #f1f5f9;
  --ink: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --line-strong: #cbd5e1;
  --accent: #0f766e;
  --accent-strong: #0d9488;
  --accent-light: rgba(13, 148, 136, 0.08);
  --ember: #f97316;
  --gold: #eab308;
  --blue: #3b82f6;
  --red: #ef4444;
  --checkerboard: #e2e8f0;
  --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.04), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-soft: 0 4px 6px -1px rgba(0, 0, 0, 0.02), 0 2px 4px -2px rgba(0, 0, 0, 0.02);
  --shadow-hover: 0 20px 25px -5px rgba(13, 148, 136, 0.1), 0 8px 10px -6px rgba(13, 148, 136, 0.05);
  --border-radius-card: 16px;
  --border-radius-btn: 12px;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei UI", "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Noto Sans SC", Arial, sans-serif;
  --font-display: var(--font-sans);
  --font-mono: "Cascadia Code", "Cascadia Mono", "SFMono-Regular", Menlo, Monaco, Consolas, "Liberation Mono", "Noto Sans Mono CJK SC", monospace;
  font-family: var(--font-sans);
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #090d16;
  --surface: #111827;
  --surface-strong: #1f2937;
  --ink: #f3f4f6;
  --muted: #9ca3af;
  --line: #374151;
  --line-strong: #4b5563;
  --accent: #0d9488;
  --accent-strong: #14b8a6;
  --accent-light: rgba(20, 184, 166, 0.15);
  --ember: #f97316;
  --gold: #facc15;
  --blue: #60a5fa;
  --red: #f87171;
  --checkerboard: #1f2937;
  --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
  --shadow-soft: 0 4px 6px -1px rgba(0, 0, 0, 0.2), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
  --shadow-hover: 0 20px 25px -5px rgba(20, 184, 166, 0.15), 0 8px 10px -6px rgba(20, 184, 166, 0.15);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 50% 0%, rgba(13, 148, 136, 0.07), transparent 45%),
    radial-gradient(circle at 0% 100%, rgba(59, 130, 246, 0.02), transparent 35%),
    var(--bg);
  color: var(--ink);
  line-height: 1.5;
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

[data-theme="dark"] body {
  background:
    radial-gradient(circle at 50% 0%, rgba(20, 184, 166, 0.12), transparent 45%),
    radial-gradient(circle at 100% 100%, rgba(59, 130, 246, 0.04), transparent 40%),
    var(--bg);
}

[hidden] {
  display: none !important;
}

a {
  color: var(--accent-strong);
  transition: color 0.2s ease;
}

a:hover {
  color: var(--accent);
}

button,
.button-link {
  min-height: 40px;
  border: 1px solid var(--line-strong);
  border-radius: var(--border-radius-btn);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  font: inherit;
  font-weight: 600;
  padding: 0.55rem 1rem;
  text-decoration: none;
  transition:
    border-color 160ms ease,
    color 160ms ease,
    background-color 160ms ease,
    transform 160ms ease,
    box-shadow 160ms ease;
}

button:hover,
.button-link:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
  transform: translateY(-1px);
}

button.is-active {
  border-color: var(--accent);
  background: var(--accent-light);
  color: var(--accent-strong);
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 3px solid rgba(13, 148, 136, 0.25);
  outline-offset: 2px;
}

textarea,
input,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--border-radius-btn);
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  padding: 0.72rem 0.78rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

textarea:focus,
input:focus,
select:focus {
  border-color: var(--accent);
  outline: none;
  box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
}

textarea {
  min-height: 9rem;
  resize: vertical;
  font-family: var(--font-mono);
  line-height: 1.45;
  font-size: 0.95rem;
}

input[readonly],
textarea[readonly] {
  background: var(--surface-strong);
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 0.65rem;
  text-align: left;
  vertical-align: top;
  word-break: break-word;
}

th {
  color: var(--muted);
  font-size: 0.85rem;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 10;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--border-radius-btn);
  padding: 0.5rem 0.75rem;
}

.skip-link:focus {
  top: 1rem;
}

.site-header,
.workspace,
.site-footer {
  width: min(1200px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  padding: 1rem 0;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--ink);
  font-weight: 800;
  font-family: var(--font-display);
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border: 1px solid rgba(13, 148, 136, 0.3);
  border-radius: var(--border-radius-btn);
  background: var(--accent-light);
  color: var(--accent-strong);
}

.brand-mark svg {
  width: 26px;
  height: 26px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 3;
}

/* Theme Toggle Button Styling */
.theme-toggle {
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--border-radius-btn);
  width: 40px;
  height: 40px;
  min-height: 40px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
  margin-left: auto; /* Push language switcher to the right */
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
  background-color: var(--surface-strong);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  transition: transform 0.2s ease;
}

.theme-toggle .sun-icon {
  display: none;
}
.theme-toggle .moon-icon {
  display: block;
}

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

.language-switch {
  display: inline-flex;
  gap: 0.25rem;
  padding: 0.2rem;
  border: 1px solid var(--line);
  border-radius: var(--border-radius-btn);
  background: var(--surface-strong);
}

.language-switch button {
  min-height: 32px;
  border-color: transparent;
  border-radius: 8px;
  padding: 0.35rem 0.55rem;
  font-size: 0.9rem;
  background: transparent;
}

.language-switch button:hover {
  background: var(--surface);
  transform: none;
}

.language-switch button[aria-pressed="true"] {
  border-color: var(--line);
  background: var(--surface);
  color: var(--accent-strong);
  box-shadow: var(--shadow-soft);
}

/* Hero Section */
.hero-section {
  text-align: center;
  padding: 3rem 1.5rem 2.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 3.75rem);
  font-weight: 800;
  margin: 0 0 0.75rem;
  background: linear-gradient(135deg, var(--accent-strong) 0%, #3b82f6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 0;
  line-height: 1.1;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: var(--muted);
  max-width: 600px;
  margin: 0;
  line-height: 1.6;
}

.eyebrow,
.tool-category {
  margin: 0 0 0.3rem;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-size: 0.85rem;
}

h1,
h2 {
  letter-spacing: 0;
  line-height: 1.2;
}

h2 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
}

.tool-finder {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(180px, 240px);
  gap: 1.25rem;
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--border-radius-card);
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.field {
  display: grid;
  gap: 0.38rem;
}

.field span {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
}

.field.tall textarea {
  min-height: 12rem;
}

.field.short {
  max-width: 10rem;
}

.workspace {
  padding-bottom: 3rem;
}

.home-view {
  display: grid;
  gap: 1.5rem;
}

.category-strip {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 0.75rem;
}

.category-tile {
  display: grid;
  justify-items: start;
  justify-content: start;
  align-content: start;
  min-height: 110px;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--border-radius-card);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
  text-align: left;
  transition: border-color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.category-tile:hover,
.category-tile.is-active {
  border-color: var(--accent);
  background: var(--surface);
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.category-tile strong {
  font-size: 1.05rem;
  font-weight: 700;
  display: block;
  margin-top: 0.25rem;
}

.category-tile small {
  color: var(--muted);
  font-weight: 500;
  font-size: 0.85rem;
}

.category-icon,
.tool-icon {
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--border-radius-btn);
  background: var(--surface-strong);
  color: var(--accent-strong);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.category-icon svg,
.tool-icon svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
}

.category-icon {
  width: 42px;
  height: 36px;
  margin-bottom: 0.55rem;
}

.catalog-section {
  border: 1px solid var(--line);
  border-radius: var(--border-radius-card);
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 1.5rem;
}

.section-heading,
.tool-heading,
.tool-view-bar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.section-heading {
  align-items: flex-end;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.75rem;
}

.catalog-count,
.tool-crumb {
  margin: 0;
  color: var(--muted);
  font-weight: 600;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.tool-card {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 1rem;
  align-items: center;
  min-height: 112px;
  border: 1px solid var(--line);
  border-radius: var(--border-radius-card);
  background: var(--surface);
  color: var(--ink);
  padding: 1rem;
  text-decoration: none;
  transition:
    border-color 0.2s ease,
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.tool-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.tool-card.is-hidden {
  display: none;
}

.tool-icon {
  width: 54px;
  height: 54px;
}

.tool-icon svg {
  width: 24px;
  height: 24px;
}

.tool-card strong {
  display: block;
  font-size: 1.05rem;
  font-weight: 600;
}

.tool-card small {
  display: block;
  margin-top: 0.2rem;
  color: var(--muted);
  font-weight: 400;
  font-size: 0.88rem;
  line-height: 1.3;
}

.empty-state {
  margin: 0.5rem 0 0;
  border: 1px dashed var(--line-strong);
  border-radius: var(--border-radius-card);
  color: var(--muted);
  padding: 2rem;
  text-align: center;
}

.tool-view {
  display: grid;
  gap: 1rem;
}

.tool-view-bar {
  align-items: center;
  min-height: 48px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: var(--border-radius-btn);
  background: var(--surface);
  color: var(--accent-strong);
  font-weight: 600;
  padding: 0.5rem 1rem;
  text-decoration: none;
  transition: border-color 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

.back-link:hover {
  border-color: var(--accent);
  color: var(--accent);
  background-color: var(--surface-strong);
}

.back-link::before {
  content: "";
  width: 0.56rem;
  height: 0.56rem;
  margin-right: 0.45rem;
  border-left: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
}

.tool-stack {
  display: grid;
  gap: 1rem;
}

.tool-panel {
  display: none;
  scroll-margin-top: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--border-radius-card);
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 1.5rem;
}

.tool-panel.is-active {
  display: block;
}

.tool-heading {
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.75rem;
}

.local-badge {
  flex: 0 0 auto;
  border: 1px solid rgba(13, 148, 136, 0.3);
  border-radius: 999px;
  color: var(--accent-strong);
  background: var(--accent-light);
  padding: 0.25rem 0.65rem;
  font-size: 0.8rem;
  font-weight: 600;
}

.split,
.image-tool-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
  align-items: end;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 1.25rem 0;
}

.actions.single {
  margin: 0;
}

.inline-form {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 0.8rem;
  margin-bottom: 0.8rem;
}

.check-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.6rem;
  margin-top: 0.85rem;
}

.check-grid label {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--border-radius-btn);
  background: var(--surface);
  color: var(--ink);
  font-weight: 500;
  padding: 0.55rem 0.65rem;
  cursor: pointer;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.check-grid label:hover {
  border-color: var(--accent);
  background-color: var(--surface-strong);
}

.check-grid input {
  width: auto;
}

.mono-output {
  min-height: 10rem;
}

.mono-output.compact-output {
  min-height: 5.5rem;
}

.websocket-log {
  min-height: 13rem;
  white-space: pre;
}

.status {
  min-height: 1.35rem;
  margin: 0.5rem 0 0;
  color: var(--muted);
}

.status.is-error {
  color: var(--red);
}

.status.is-ok {
  color: var(--accent-strong);
}

.finance-note {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--border-radius-card);
  margin-top: 0.85rem;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.6rem;
  margin-top: 0.8rem;
}

.result-grid.dense {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.result-grid output {
  border: 1px solid var(--line);
  border-radius: var(--border-radius-btn);
  background: var(--surface-strong);
  padding: 0.68rem 0.75rem;
  word-break: break-word;
  color: var(--ink);
}

.contrast-preview {
  min-height: 86px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--border-radius-card);
  padding: 1rem;
  font-weight: 700;
  text-align: center;
}

.gradient-preview {
  min-height: 180px;
  border: 1px solid var(--line);
  border-radius: var(--border-radius-card);
  margin-top: 1rem;
  box-shadow: var(--shadow-soft);
}

.inline-form .field:not(.short) {
  flex: 1 1 16rem;
}

.result-list {
  display: grid;
  gap: 0.45rem;
  max-height: 22rem;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: var(--border-radius-card);
  background: var(--surface-strong);
  padding: 0.75rem;
}

.result-list:empty {
  display: none;
}

.match-item {
  display: grid;
  gap: 0.25rem;
  border: 1px solid var(--line);
  border-radius: var(--border-radius-btn);
  background: var(--surface);
  padding: 0.65rem 0.75rem;
}

.match-item code {
  white-space: pre-wrap;
  word-break: break-word;
  font-family: var(--font-mono);
}

.match-item small,
.match-meta,
.result-empty {
  color: var(--muted);
  font-size: 0.86rem;
}

.result-empty {
  margin: 0;
}

.file-drop {
  display: grid;
  gap: 0.55rem;
  border: 1px dashed var(--line-strong);
  border-radius: var(--border-radius-card);
  padding: 1.5rem;
  background: var(--surface-strong);
  color: var(--muted);
  font-weight: 500;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.file-drop:hover {
  border-color: var(--accent);
  background-color: var(--surface);
}

.file-drop input {
  padding: 0;
  border: 0;
  background: transparent;
}

.canvas-frame,
.preview-box {
  display: grid;
  place-items: center;
  min-height: 320px;
  margin-top: 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--border-radius-card);
  background:
    linear-gradient(45deg, var(--checkerboard) 25%, transparent 25%),
    linear-gradient(-45deg, var(--checkerboard) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--checkerboard) 75%),
    linear-gradient(-45deg, transparent 75%, var(--checkerboard) 75%);
  background-size: 22px 22px;
  background-position:
    0 0,
    0 11px,
    11px -11px,
    -11px 0;
  overflow: hidden;
}

canvas,
.preview-box img {
  max-width: 100%;
  max-height: 520px;
}

.preview-box img {
  display: none;
  object-fit: contain;
}

.preview-box img.has-image {
  display: block;
}

.color-readout,
.settings-grid {
  display: grid;
  align-content: start;
  gap: 0.85rem;
}

.picker-readout-group {
  display: grid;
  gap: 0.65rem;
}

.picker-readout-group + .picker-readout-group {
  border-top: 1px solid var(--line);
  padding-top: 0.85rem;
}

.picker-readout-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
}

.picker-readout-heading strong {
  font-size: 0.95rem;
  min-width: 0;
}

.picker-readout-heading output {
  color: var(--muted);
  font-size: 0.9rem;
  min-width: 0;
  overflow-wrap: anywhere;
  text-align: right;
}

.swatch {
  width: 100%;
  min-height: 96px;
  border: 1px solid var(--line);
  border-radius: var(--border-radius-btn);
  background: var(--surface-strong);
}

.swatch.compact {
  min-height: 58px;
}

.swatch.small {
  display: inline-block;
  width: 100%;
  min-height: 42px;
}

.color-preview {
  display: grid;
  align-content: end;
}

.button-link.disabled {
  pointer-events: none;
  opacity: 0.55;
}

.site-footer {
  color: var(--muted);
  padding: 0 0 3rem;
}

.footer-inner {
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1.5rem;
}

.footer-note {
  margin: 0;
  font-size: 0.9rem;
}

.footer-records {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.45rem;
}

.footer-records a {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  border: 1px solid var(--line);
  border-radius: var(--border-radius-btn);
  background: var(--surface-strong);
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.35rem 0.6rem;
  text-decoration: none;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.footer-records a:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
  background-color: var(--surface);
}

@media (max-width: 980px) {
  .tool-grid {
    grid-template-columns: 1fr 1fr;
  }

  .category-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .check-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

}

@media (max-width: 720px) {
  .site-header,
  .workspace,
  .site-footer {
    width: min(100% - 20px, 1200px);
  }

  .section-heading,
  .tool-heading,
  .tool-view-bar,
  .footer-inner {
    align-items: stretch;
    flex-direction: column;
  }

  .footer-records {
    justify-content: space-between;
  }

  .tool-finder,
  .tool-grid,
  .split,
  .image-tool-grid,
  .grid-3,
  .result-grid,
  .result-grid.dense {
    grid-template-columns: 1fr;
  }

  .category-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tool-card {
    grid-template-columns: 54px minmax(0, 1fr);
    min-height: 98px;
  }

  .tool-icon {
    width: 54px;
    height: 54px;
  }

  .tool-panel,
  .catalog-section {
    padding: 1rem;
  }

  .canvas-frame,
  .preview-box {
    min-height: 240px;
  }

  .picker-readout-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.25rem;
  }

  .picker-readout-heading output {
    text-align: left;
  }

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