:root {
  color-scheme: light;
  --bg: #f5f7f4;
  --surface: #ffffff;
  --surface-soft: #edf3ef;
  --ink: #172027;
  --muted: #5d6972;
  --line: #d6ded8;
  --line-strong: #aebbb4;
  --blue: #235f82;
  --green: #1f6b54;
  --rust: #a24d32;
  --gold: #8a681d;
  --danger: #a43f3f;
  --code: #0e1720;
  --code-ink: #edf7f3;
  --shadow: 0 16px 34px rgba(23, 32, 39, 0.09);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
select,
input[type="checkbox"] {
  cursor: pointer;
}

textarea,
input,
select {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: #ffffff;
  color: var(--ink);
}

textarea,
input,
select {
  padding: 10px 12px;
}

textarea {
  min-height: 220px;
  resize: vertical;
  line-height: 1.45;
}

pre,
code,
textarea.mono {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

pre {
  margin: 0;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.app-shell {
  min-height: 100vh;
}

.topbar {
  display: grid;
  grid-template-columns: minmax(180px, 0.24fr) minmax(0, 1fr) auto;
  gap: 22px;
  align-items: center;
  padding: 18px 24px;
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
}

.brand-mark {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
  color: var(--rust);
}

.topbar-title h1,
.topbar-title p,
.tool-head h2,
.tool-summary,
.eyebrow,
.status-line {
  margin: 0;
}

.topbar-title h1 {
  font-size: 24px;
  line-height: 1.1;
  letter-spacing: 0;
}

.topbar-title p,
.tool-summary,
.status-line {
  color: var(--muted);
}

.home-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: #ffffff;
  font-weight: 800;
}

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

.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 40px;
  padding: 0 12px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: #ffffff;
  color: var(--ink);
  font-weight: 800;
}

.lang-toggle:hover { border-color: var(--blue); color: var(--blue); }
.lang-toggle svg { width: 16px; height: 16px; }

.workspace {
  display: grid;
  grid-template-columns: 292px minmax(0, 1fr);
  min-height: calc(100vh - 77px);
}

.sidebar {
  border-right: 1px solid var(--line);
  background: #eef2ee;
  padding: 18px;
}

.search-label,
.field-label {
  display: block;
  margin-bottom: 7px;
  color: #34414a;
  font-size: 13px;
  font-weight: 800;
}

.search-input {
  margin-bottom: 14px;
  background: #ffffff;
}

.tool-nav {
  display: grid;
  gap: 8px;
}

.nav-group {
  margin-top: 8px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.tool-tab {
  width: 100%;
  min-height: 46px;
  padding: 9px 10px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: #2d3941;
  text-align: left;
}

.tool-tab strong,
.tool-tab span {
  display: block;
}

.tool-tab strong {
  font-size: 14px;
}

.tool-tab span {
  color: var(--muted);
  font-size: 12px;
}

.tool-tab:hover,
.tool-tab.active {
  border-color: var(--line-strong);
  background: #ffffff;
  box-shadow: 0 8px 18px rgba(23, 32, 39, 0.06);
}

.tool-tab.active {
  color: var(--green);
}

.tool-area {
  min-width: 0;
  padding: 24px;
}

.tool-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.34fr);
  gap: 20px;
  align-items: end;
  margin-bottom: 18px;
}

.eyebrow {
  color: var(--rust);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.tool-head h2 {
  margin-top: 5px;
  font-size: 34px;
  line-height: 1.08;
  letter-spacing: 0;
}

.example-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.tool-content {
  display: grid;
  gap: 14px;
}

.pane {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.pane-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-height: 52px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
}

.pane-title {
  margin: 0;
  font-size: 15px;
  line-height: 1.2;
}

.pane-body {
  padding: 14px;
}

.grid-2,
.grid-3,
.grid-auto {
  display: grid;
  gap: 14px;
}

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

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

.grid-auto {
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
}

.actions,
.inline-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.inline-controls {
  align-items: end;
}

.field-row {
  display: grid;
  gap: 7px;
}

.check-row {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  color: #34414a;
  font-weight: 700;
}

.check-row input {
  width: auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 12px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: #ffffff;
  color: var(--ink);
  font-weight: 800;
  white-space: nowrap;
}

.btn.primary {
  border-color: var(--green);
  background: var(--green);
  color: #ffffff;
}

.btn.warn {
  border-color: var(--rust);
  color: var(--rust);
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(23, 32, 39, 0.1);
}

.output {
  min-height: 220px;
  padding: 12px;
  border-radius: 8px;
  background: var(--code);
  color: var(--code-ink);
}

.light-output {
  min-height: 160px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfb;
}

.status-line {
  min-height: 22px;
  margin-top: 14px;
  font-size: 14px;
}

.issue-list {
  margin: 0;
  padding-left: 18px;
  color: #39454e;
}

.issue-list li + li {
  margin-top: 6px;
}

.diff-table,
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

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

.diff-table th,
.data-table th {
  background: #eef3ef;
}

.line-add {
  background: #e7f6ee;
}

.line-remove {
  background: #fae9e5;
}

.line-equal {
  background: #f8faf8;
}

.match {
  border-radius: 4px;
  background: #fdeebf;
  color: #172027;
}

.preview-frame-wrap {
  width: 100%;
  overflow: auto;
}

.preview-frame {
  display: block;
  width: 100%;
  height: 360px;
  margin: 0 auto;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: #ffffff;
}

.hidden-frame {
  width: 0;
  height: 0;
  border: 0;
  position: absolute;
  left: -9999px;
}

.checklist {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.checklist li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfb;
}

.checklist input[type="checkbox"] {
  width: 18px;
  height: 18px;
}

.checklist input[type="text"] {
  min-width: 0;
}

.progress {
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: #dfe7e1;
}

.progress span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--green);
}

@media (max-width: 980px) {
  .workspace,
  .tool-head,
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }

  .workspace {
    min-height: auto;
  }

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

  .tool-nav {
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  }

  .example-bar {
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .topbar {
    grid-template-columns: 1fr;
  }

  .tool-area,
  .sidebar {
    padding: 16px;
  }

  .tool-head h2 {
    font-size: 28px;
  }

  .home-link,
  .btn {
    width: 100%;
  }

  .actions,
  .inline-controls,
  .example-bar {
    display: grid;
    grid-template-columns: 1fr;
  }
}