:root {
  color-scheme: light;
  --bg: #f6f7fb;
  --panel: #ffffff;
  --panel-soft: #f0f3f8;
  --text: #18202f;
  --muted: #667085;
  --line: #d8dee8;
  --brand: #1769e0;
  --brand-dark: #0e55bd;
  --green: #0f8f5b;
  --green-bg: #e8f7ef;
  --red: #c8362e;
  --red-bg: #fdecea;
  --yellow: #926800;
  --yellow-bg: #fff6d7;
  --shadow: 0 20px 60px rgba(22, 30, 46, .10);
  --radius: 8px;
}

body.dark {
  color-scheme: dark;
  --bg: #111827;
  --panel: #182234;
  --panel-soft: #222d42;
  --text: #eef2f7;
  --muted: #aab4c4;
  --line: #344055;
  --brand: #62a0ff;
  --brand-dark: #8cbbff;
  --green: #73d9a4;
  --green-bg: #133525;
  --red: #ff918a;
  --red-bg: #421c1c;
  --yellow: #f7cb62;
  --yellow-bg: #3d3116;
  --shadow: 0 20px 60px rgba(0, 0, 0, .30);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
}

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 20px;
  align-items: center;
  min-height: 68px;
  padding: 12px clamp(16px, 4vw, 48px);
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
  overflow-x: clip;
}

.topbar > * {
  min-width: 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 7px;
  background: var(--brand);
  color: #fff;
  font-size: 13px;
}

.main-nav,
.top-actions,
.toolbar,
.trust-row,
.stats,
.folder-tool {
  display: flex;
  align-items: center;
}

.main-nav {
  justify-content: center;
  gap: 4px;
  width: 100%;
  max-width: 100%;
  min-width: 0;
}

.nav-link {
  padding: 9px 13px;
  border-radius: 7px;
  color: var(--muted);
  text-decoration: none;
  font-weight: 650;
}

.nav-link.active,
.nav-link:hover {
  background: var(--panel-soft);
  color: var(--text);
}

.top-actions {
  justify-content: end;
  gap: 10px;
}

.language-picker {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  max-width: 190px;
}

.language-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 0 10px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  font-weight: 750;
}

.language-flag-img {
  width: 22px;
  height: 16px;
  border-radius: 2px;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, .14);
  object-fit: cover;
  flex: 0 0 auto;
}

.language-toggle span:not(.language-caret) {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.language-caret {
  color: var(--muted);
  margin-left: auto;
}

.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 40;
  display: none;
  width: 220px;
  max-height: 310px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.language-picker.open .language-menu {
  display: grid;
  gap: 2px;
}

.language-option {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  min-height: 36px;
  border: 0;
  border-radius: 6px;
  padding: 7px 8px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  text-align: left;
}

.language-option:hover,
.language-option.active {
  background: var(--panel-soft);
}

.primary-button,
.ghost-button,
.icon-button,
.segment,
.file-button {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 7px;
  min-height: 38px;
  padding: 9px 14px;
  cursor: pointer;
  font-weight: 700;
  text-decoration: none;
}

.tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  left: 50%;
  top: calc(100% + 10px);
  z-index: 60;
  width: max-content;
  max-width: 260px;
  transform: translateX(-50%) translateY(-4px);
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 8px 10px;
  background: var(--text);
  color: var(--panel);
  box-shadow: 0 12px 32px rgba(0, 0, 0, .18);
  font-size: 12px;
  font-weight: 650;
  line-height: 1.35;
  opacity: 0;
  pointer-events: none;
  transition: opacity .14s ease, transform .14s ease;
  white-space: normal;
}

.tooltip::before {
  content: "";
  position: absolute;
  left: 50%;
  top: calc(100% + 4px);
  z-index: 61;
  width: 10px;
  height: 10px;
  transform: translateX(-50%) rotate(45deg);
  background: var(--text);
  opacity: 0;
  pointer-events: none;
  transition: opacity .14s ease;
}

.tooltip:hover::after,
.tooltip:hover::before,
.tooltip:focus-visible::after,
.tooltip:focus-visible::before {
  opacity: 1;
}

.tooltip:hover::after,
.tooltip:focus-visible::after {
  transform: translateX(-50%) translateY(0);
}

.top-actions .tooltip::after {
  left: auto;
  right: 0;
  transform: translateY(-4px);
}

.top-actions .tooltip:hover::after,
.top-actions .tooltip:focus-visible::after {
  transform: translateY(0);
}

.top-actions .tooltip::before {
  left: auto;
  right: 14px;
  transform: rotate(45deg);
}

.primary-button {
  border-color: var(--brand);
  background: var(--brand);
  color: #fff;
}

.primary-button:hover {
  background: var(--brand-dark);
}

.primary-button.small {
  min-height: 34px;
  padding: 7px 12px;
}

.ghost-button,
.icon-button,
.segment,
.file-button {
  background: var(--panel);
  color: var(--text);
}

.icon-button {
  display: grid;
  place-items: center;
  width: 38px;
  padding: 0;
}

main {
  width: min(1480px, 100%);
  margin: 0 auto;
  padding: 24px clamp(14px, 3vw, 34px) 44px;
}

.tool-shell {
  margin-bottom: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.tool-shell {
  padding: clamp(16px, 2vw, 24px);
}

.tool-shell.compact {
  box-shadow: none;
}

.hero-strip {
  display: block;
  padding-bottom: 18px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--brand);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  line-height: 1.08;
  letter-spacing: 0;
}

h1 {
  max-width: 820px;
  font-size: clamp(34px, 5vw, 64px);
}

h2 {
  font-size: 24px;
}

.trust-row {
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.trust-row span {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 10px;
  color: var(--muted);
  font-size: 13px;
}

.toolbar {
  position: sticky;
  top: 69px;
  z-index: 10;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 -4px 16px;
  padding: 10px 4px;
  background: color-mix(in srgb, var(--panel) 94%, transparent);
  backdrop-filter: blur(14px);
}

.segmented {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 3px;
  background: var(--panel-soft);
}

.segment {
  min-height: 32px;
  border: 0;
  background: transparent;
  color: var(--muted);
}

.segment.active {
  background: var(--panel);
  color: var(--text);
  box-shadow: 0 2px 10px rgba(0, 0, 0, .08);
}

.select-wrap,
.check {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 38px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 650;
}

select {
  min-height: 34px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--panel);
  color: var(--text);
}

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

.editor-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel);
}

.editor-head,
.result-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 14px;
  border-bottom: 1px solid var(--line);
}

.editor-head h2 {
  font-size: 16px;
}

.file-button {
  position: relative;
  min-height: 32px;
  padding: 6px 10px;
  color: var(--brand);
  font-size: 13px;
}

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

textarea {
  display: block;
  width: 100%;
  min-height: 330px;
  padding: 14px;
  border: 0;
  resize: vertical;
  outline: none;
  background: var(--panel);
  color: var(--text);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 14px;
  line-height: 1.55;
}

.result-wrap {
  margin-top: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.stats {
  flex-wrap: wrap;
  justify-content: end;
  gap: 8px;
}

.stats span {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 10px;
  color: var(--muted);
  font-size: 13px;
}

.diff-output {
  min-height: 160px;
  overflow: auto;
  background: color-mix(in srgb, var(--panel-soft) 52%, var(--panel));
}

.empty-state {
  display: grid;
  place-items: center;
  padding: 28px;
  color: var(--muted);
  text-align: center;
}

.diff-table {
  width: 100%;
  border-collapse: collapse;
  table-layout: fixed;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 13px;
}

.diff-table td {
  vertical-align: top;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 70%, transparent);
  padding: 5px 8px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.line-no {
  width: 58px;
  color: var(--muted);
  text-align: right;
  user-select: none;
}

.line-add {
  background: var(--green-bg);
}

.line-del {
  background: var(--red-bg);
}

.line-change {
  background: var(--yellow-bg);
}

.char-add {
  background: color-mix(in srgb, var(--green) 22%, transparent);
  color: var(--text);
}

.char-del {
  background: color-mix(in srgb, var(--red) 22%, transparent);
  color: var(--text);
  text-decoration: line-through;
}

.section-title {
  margin-bottom: 16px;
}

.image-tool,
.document-tool,
.sheet-grid {
  display: grid;
  grid-template-columns: 220px 220px 1fr;
  gap: 14px;
  align-items: stretch;
}

.drop-zone {
  display: grid;
  place-items: center;
  min-height: 142px;
  border: 1px dashed var(--brand);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--brand) 7%, var(--panel));
  color: var(--brand);
  font-weight: 800;
  text-align: center;
  cursor: pointer;
}

.drop-zone input {
  display: none;
}

.image-preview {
  position: relative;
  min-height: 300px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background:
    linear-gradient(45deg, color-mix(in srgb, var(--line) 60%, transparent) 25%, transparent 25%),
    linear-gradient(-45deg, color-mix(in srgb, var(--line) 60%, transparent) 25%, transparent 25%);
  background-size: 22px 22px;
}

.image-preview img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

#previewB {
  clip-path: inset(0 0 0 50%);
}

#imageSlider {
  position: absolute;
  left: 24px;
  right: 24px;
  bottom: 16px;
  width: calc(100% - 48px);
}

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

.sheet-grid textarea {
  min-height: 190px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.table-output,
.folder-output {
  margin-top: 14px;
  overflow: auto;
}

.folder-tool {
  flex-wrap: wrap;
  gap: 14px;
}

.folder-tool .drop-zone {
  min-width: 220px;
}

.document-tool {
  align-items: stretch;
}

.doc-panel {
  display: grid;
  gap: 9px;
  align-content: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  background: var(--panel-soft);
}

.doc-panel span {
  color: var(--muted);
  font-size: 14px;
}

.folder-output table,
.table-output table {
  width: 100%;
  border-collapse: collapse;
  background: var(--panel);
}

.folder-output td,
.folder-output th,
.table-output td {
  border: 1px solid var(--line);
  padding: 8px;
  text-align: left;
}

.help-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.help-grid article {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  background: var(--panel-soft);
}

.help-grid h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.help-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  width: min(1480px, 100%);
  margin: 0 auto;
  padding: 0 clamp(14px, 3vw, 34px) 34px;
  color: var(--muted);
  font-size: 13px;
}

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

  .main-nav {
    grid-column: 1 / -1;
    justify-content: start;
    overflow-x: auto;
    overscroll-behavior-x: contain;
  }

  .hero-strip,
  .editor-grid,
  .image-tool,
  .document-tool,
  .sheet-grid {
    grid-template-columns: 1fr;
  }

  .trust-row {
    justify-content: flex-start;
  }

  .toolbar {
    position: static;
  }

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

@media (max-width: 620px) {
  .top-actions .ghost-button {
    display: none;
  }

  .language-picker {
    max-width: 132px;
  }

  h1 {
    font-size: 42px;
  }

  .result-head,
  footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .diff-table {
    font-size: 12px;
  }
}