:root {
  color-scheme: light;
  --bg: #f5f7f9;
  --surface: #ffffff;
  --surface-2: #eef2f5;
  --text: #17212b;
  --muted: #667382;
  --line: #dbe2e8;
  --accent: #126b63;
  --accent-dark: #0e554f;
  --accent-soft: #e3f3f0;
  --danger: #a43a3a;
  --danger-soft: #fff0f0;
  --warning: #845816;
  --warning-soft: #fff5df;
  --success: #17663d;
  --success-soft: #e9f7ef;
  --code: #16202a;
  --shadow: 0 18px 45px rgba(24, 34, 45, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 85% 5%, rgba(18, 107, 99, 0.08), transparent 24rem),
    var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

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

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(219, 226, 232, 0.9);
  background: rgba(245, 247, 249, 0.9);
  backdrop-filter: blur(16px);
}

.nav,
.page,
.site-footer {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.nav {
  display: flex;
  min-height: 66px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 760;
}

.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 10px;
  background: var(--text);
  color: #fff;
  font-size: 0.82rem;
  letter-spacing: -0.03em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  border-radius: 8px;
  color: var(--muted);
  font-size: 0.91rem;
  font-weight: 620;
  padding: 8px 10px;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  background: var(--surface-2);
  color: var(--text);
  outline: none;
}

.page {
  padding: 38px 0 64px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-bottom: 28px;
  color: var(--muted);
  font-size: 0.86rem;
}

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

.tool-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(250px, 0.48fr);
  gap: 36px;
  align-items: end;
  margin-bottom: 26px;
}

.category-label {
  display: inline-flex;
  margin-bottom: 12px;
  border-radius: 7px;
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-size: 0.75rem;
  font-weight: 780;
  letter-spacing: 0.06em;
  padding: 5px 9px;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 12px;
  font-size: clamp(2.15rem, 5vw, 4.15rem);
  line-height: 1;
  letter-spacing: -0.045em;
}

.tool-description {
  max-width: 700px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 1.06rem;
}

.privacy-note {
  border: 1px solid #cce5df;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.72);
  color: #365b56;
  font-size: 0.88rem;
  padding: 14px 16px;
}

.privacy-note strong {
  display: block;
  margin-bottom: 3px;
  color: var(--accent-dark);
}

.workspace {
  min-height: 340px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.tool-panel {
  padding: 24px;
}

.tool-panel + .tool-panel,
.panel-divider {
  border-top: 1px solid var(--line);
}

.panel-heading {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 16px;
}

.panel-heading h2,
.panel-heading h3 {
  margin-bottom: 4px;
  font-size: 1rem;
}

.panel-heading p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.87rem;
}

.input-grid,
.output-grid,
.control-grid,
.preview-grid,
.stat-grid {
  display: grid;
  gap: 14px;
}

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

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

.stat-grid {
  grid-template-columns: repeat(6, minmax(0, 1fr));
}

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

.field > span,
.field-label {
  color: #465361;
  font-size: 0.8rem;
  font-weight: 720;
}

textarea,
input[type="text"],
input[type="number"],
input[type="datetime-local"],
select,
.code-output {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #fbfcfd;
  color: var(--text);
  outline: none;
  transition: border-color 150ms ease, box-shadow 150ms ease;
}

textarea,
.code-output {
  min-height: 190px;
  padding: 13px 14px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.86rem;
  line-height: 1.58;
  resize: vertical;
  tab-size: 2;
}

input[type="text"],
input[type="number"],
input[type="datetime-local"],
select {
  min-height: 43px;
  padding: 8px 11px;
}

textarea:focus,
input:focus,
select:focus,
.code-output:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(18, 107, 99, 0.12);
}

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

.compact-output {
  min-height: 92px;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  margin-top: 15px;
}

.button {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font-size: 0.88rem;
  font-weight: 720;
  padding: 8px 14px;
}

.button:hover,
.button:focus-visible {
  border-color: #b9c4cd;
  background: var(--surface-2);
  outline: none;
}

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

.button-primary:hover,
.button-primary:focus-visible {
  border-color: var(--accent-dark);
  background: var(--accent-dark);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.check-row {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.86rem;
}

.check-row input {
  width: 17px;
  height: 17px;
  accent-color: var(--accent);
}

.status-message {
  min-height: 22px;
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.status-message[data-type="error"] {
  color: var(--danger);
}

.status-message[data-type="success"] {
  color: var(--success);
}

.metric {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fbfcfd;
  padding: 14px;
}

.metric strong {
  display: block;
  overflow: hidden;
  color: var(--text);
  font-size: 1.22rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.metric span {
  color: var(--muted);
  font-size: 0.75rem;
}

.result-table-wrap {
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 9px;
}

.result-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.83rem;
}

.result-table th,
.result-table td {
  border-bottom: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

.result-table tr:last-child td {
  border-bottom: 0;
}

.result-table th {
  background: var(--surface-2);
  color: #4d5966;
  font-size: 0.73rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.result-table code {
  font-family: "SFMono-Regular", Consolas, monospace;
  word-break: break-all;
}

.change-added {
  background: var(--success-soft);
}

.change-removed {
  background: var(--danger-soft);
}

.change-changed {
  background: var(--warning-soft);
}

.match-preview {
  min-height: 150px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #fbfcfd;
  padding: 14px;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.86rem;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
}

mark {
  border-radius: 3px;
  background: #ffe69b;
  color: inherit;
  padding: 1px 0;
}

.drop-zone {
  display: grid;
  min-height: 130px;
  place-items: center;
  border: 1px dashed #aebbc5;
  border-radius: 10px;
  background: #fafcfd;
  padding: 22px;
  text-align: center;
}

.drop-zone input {
  max-width: 100%;
}

.drop-zone p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.image-preview {
  display: grid;
  min-height: 260px;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 10px;
  background:
    linear-gradient(45deg, #eef1f3 25%, transparent 25%),
    linear-gradient(-45deg, #eef1f3 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #eef1f3 75%),
    linear-gradient(-45deg, transparent 75%, #eef1f3 75%),
    #fff;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
  background-size: 16px 16px;
}

.image-preview img {
  display: block;
  max-width: 100%;
  max-height: 420px;
  object-fit: contain;
}

.preview-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.78rem;
}

.range-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.range-row input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.range-value {
  min-width: 44px;
  border-radius: 6px;
  background: var(--surface-2);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 7px;
  text-align: center;
}

.color-control {
  display: flex;
  gap: 8px;
}

.color-control input[type="color"] {
  width: 52px;
  min-height: 43px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 4px;
}

.contrast-sample {
  display: grid;
  min-height: 220px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 28px;
  text-align: center;
}

.contrast-sample strong {
  display: block;
  font-size: clamp(1.7rem, 4vw, 3.2rem);
  line-height: 1.05;
}

.contrast-sample span {
  display: block;
  margin-top: 8px;
}

.badge-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.result-badge {
  border-radius: 7px;
  background: var(--danger-soft);
  color: var(--danger);
  font-size: 0.79rem;
  font-weight: 700;
  padding: 7px 9px;
}

.result-badge.pass {
  background: var(--success-soft);
  color: var(--success);
}

.related-section {
  padding-top: 42px;
}

.related-section h2 {
  margin-bottom: 14px;
  font-size: 1rem;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.related-card {
  border: 1px solid var(--line);
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.76);
  padding: 15px;
}

.related-card:hover,
.related-card:focus-visible {
  border-color: #b8c6ce;
  background: #fff;
  outline: none;
}

.related-card strong {
  display: block;
  margin-bottom: 4px;
}

.related-card span {
  color: var(--muted);
  font-size: 0.82rem;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.84rem;
  padding: 24px 0 34px;
}

.site-footer p {
  margin: 0;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

@media (max-width: 880px) {
  .tool-hero,
  .input-grid,
  .output-grid,
  .preview-grid {
    grid-template-columns: 1fr;
  }

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

  .control-grid > [style*="grid-column"] {
    grid-column: 1 / -1 !important;
  }

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

@media (max-width: 640px) {
  .nav,
  .page,
  .site-footer {
    width: min(100% - 26px, 1120px);
  }

  .nav {
    min-height: 60px;
  }

  .brand-name,
  .nav-links a:not(:first-child) {
    display: none;
  }

  .page {
    padding-top: 26px;
  }

  h1 {
    font-size: 2.35rem;
  }

  .tool-panel {
    padding: 17px;
  }

  .control-grid,
  .stat-grid,
  .related-grid {
    grid-template-columns: 1fr;
  }

  .stat-grid > [style*="grid-column"] {
    grid-column: auto !important;
  }

  .panel-heading,
  .site-footer {
    display: block;
  }

  .site-footer p + p {
    margin-top: 5px;
  }
}