:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --surface: #fff;
  --surface-soft: #f8faff;
  --surface-blue: #edf4ff;
  --border: #d9e1ee;
  --border-strong: #c5d0e1;
  --text: #122033;
  --muted: #60708a;
  --blue: #2463eb;
  --blue-strong: #174dc1;
  --green: #16865b;
  --green-soft: #eaf8f1;
  --amber: #a45b08;
  --amber-soft: #fff7e7;
  --red: #b42318;
  --shadow: 0 16px 40px rgba(42, 60, 92, .09);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

html[data-theme="dark"],
html[data-theme="dark"] body,
html[data-site-theme="dark"],
html[data-site-theme="dark"] body,
html[data-theme="dark"] .app,
html[data-site-theme="dark"] .app,
html[data-theme="dark"] .panel,
html[data-site-theme="dark"] .panel,
html[data-theme="dark"] .workspace,
html[data-site-theme="dark"] .workspace {
  background-color: #0c111b !important;
  color: #e8edf6 !important;
}

html[data-site-theme="dark"], html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0d1422;
  --surface: #131d2e;
  --surface-soft: #172338;
  --surface-blue: #17294a;
  --border: #2d3d57;
  --border-strong: #405473;
  --text: #eef4ff;
  --muted: #a8b6cc;
  --blue: #76a0ff;
  --blue-strong: #a8c2ff;
  --green: #60d3a2;
  --green-soft: #15352c;
  --amber: #ffc168;
  --amber-soft: #392b18;
  --red: #ff938b;
  --shadow: 0 18px 44px rgba(0, 0, 0, .24);
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); }
button, input, select, textarea { font: inherit; }
button, select, input, textarea { color: inherit; }
button { cursor: pointer; }
[hidden] { display: none !important; }

.timestamp-app { width: min(1080px, calc(100% - 32px)); margin: 0 auto; padding: 22px 0 14px; }
.tool-heading { display: flex; align-items: center; justify-content: space-between; gap: 18px; margin-bottom: 15px; }
.tool-heading-icon { width: 50px; height: 50px; flex: none; border-radius: 13px; }
.tool-heading > div:not(.local-badge) { flex: 1; }
.tool-heading h1 { margin: 2px 0 4px; font-size: clamp(1.48rem, 2.5vw, 1.9rem); letter-spacing: -.035em; line-height: 1.08; }
.tool-heading > div > p:last-child { max-width: 690px; margin: 0; color: var(--muted); font-size: .8rem; line-height: 1.45; }
.eyebrow { margin: 0; color: var(--blue); font-size: .73rem; font-weight: 800; letter-spacing: .13em; text-transform: uppercase; }
.local-badge { display: inline-flex; align-items: center; gap: 7px; flex: none; padding: 7px 10px; border: 1px solid var(--border); border-radius: 999px; background: var(--surface); color: var(--muted); font-size: .72rem; font-weight: 750; }
.local-badge span { width: 8px; height: 8px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 4px color-mix(in srgb, var(--green) 15%, transparent); }

.mode-tabs { display: grid; width: min(100%, 570px); margin-bottom: 14px; padding: 4px; border: 1px solid var(--border); border-radius: 12px; background: color-mix(in srgb, var(--surface) 86%, var(--surface-soft)); grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 3px; }
.mode-tabs button { min-width: 0; min-height: 36px; padding: 7px 11px; white-space: nowrap; border: 0; border-radius: 8px; background: transparent; color: var(--muted); font-size: .78rem; font-weight: 750; }
.mode-tabs button:hover { color: var(--text); background: var(--surface-soft); }
.mode-tabs button.active { background: var(--blue); color: white; box-shadow: 0 5px 14px rgba(36, 99, 235, .22); }

.workspace { min-height: 0; }
.primary-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; align-items: start; }
.panel { border: 1px solid var(--border); border-radius: 15px; background: var(--surface); box-shadow: var(--shadow); }
.conversion-panel, .compact-panel, .result-panel, .reverse-result, .batch-result-panel, .compare-result-panel { padding: 19px; }
.panel-heading { display: flex; align-items: center; gap: 11px; margin-bottom: 17px; }
.panel-heading h2 { margin: 0 0 3px; font-size: 1.05rem; letter-spacing: -.015em; }
.panel-heading p { margin: 0; color: var(--muted); font-size: .8rem; }
.step-number { display: grid; width: 34px; height: 34px; flex: none; place-items: center; border: 1px solid color-mix(in srgb, var(--blue) 25%, var(--border)); border-radius: 9px; background: var(--surface-blue); color: var(--blue); font-size: .73rem; font-weight: 850; }

label, .timestamp-field > label, .unit-control label { font-size: .8rem; font-weight: 760; }
.input-wrap { display: flex; align-items: stretch; margin-top: 8px; }
.input-wrap input { min-width: 0; flex: 1; border-radius: 10px 0 0 10px; }
.input-wrap button { border-left: 0; border-radius: 0 10px 10px 0; }
input, select, textarea, .input-wrap button { border: 1px solid var(--border-strong); background: var(--surface-soft); }
input, select { min-height: 44px; padding: 10px 12px; border-radius: 9px; }
textarea { width: 100%; padding: 12px; border-radius: 10px; line-height: 1.5; resize: vertical; }
input:focus, select:focus, textarea:focus, button:focus-visible, summary:focus-visible { outline: 3px solid color-mix(in srgb, var(--blue) 25%, transparent); outline-offset: 2px; border-color: var(--blue); }
.timestamp-field > p, .shortcut { margin: 8px 0 0; color: var(--muted); font-size: .75rem; line-height: 1.45; }
code, kbd, output { font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; }
kbd { padding: 1px 5px; border: 1px solid var(--border); border-bottom-width: 2px; border-radius: 4px; background: var(--surface-soft); color: var(--text); font-size: .7rem; }
.field-error { margin: 10px 0 0; color: var(--red); font-size: .8rem; font-weight: 650; }
.unit-control { display: grid; grid-template-columns: 1fr minmax(145px, .75fr); gap: 14px; align-items: end; margin-top: 19px; padding-top: 17px; border-top: 1px solid var(--border); }
.unit-control > div { display: flex; flex-direction: column; gap: 4px; }
.unit-control span { color: var(--muted); font-size: .74rem; }
.primary-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
button { min-height: 38px; padding: 8px 12px; border: 1px solid var(--border-strong); border-radius: 8px; background: var(--surface); font-size: .8rem; font-weight: 750; }
button:hover { border-color: color-mix(in srgb, var(--blue) 45%, var(--border)); color: var(--blue); }
.primary-button { border-color: var(--blue); background: var(--blue); color: white; }
.primary-button:hover { border-color: var(--blue-strong); background: var(--blue-strong); color: white; }
.primary-button span { margin-left: 10px; }

.result-heading { margin-bottom: 12px; padding-bottom: 10px; border-bottom: 1px solid var(--border); }
.valid-badge { margin-left: auto; padding: 5px 9px; border: 1px solid color-mix(in srgb, var(--green) 35%, var(--border)); border-radius: 999px; background: var(--green-soft); color: var(--green); font-size: .72rem; font-weight: 850; }
.result-content-grid { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr); gap: 8px; align-items: stretch; }
.featured-results { display: grid; gap: 7px; }
.featured-results article { position: relative; display: grid; gap: 4px; padding: 9px 42px 9px 11px; border: 1px solid var(--border); border-radius: 9px; background: var(--surface-soft); }
.featured-results article:first-child, .featured-results article:nth-child(3) { border-color: color-mix(in srgb, var(--blue) 28%, var(--border)); background: var(--surface-blue); }
.featured-results span, .copy-actions span, .reverse-result span, .delta-grid span { color: var(--muted); font-size: .69rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; }
.featured-results output { overflow-wrap: anywhere; font-size: .75rem; font-weight: 700; line-height: 1.4; }
.featured-results button { position: absolute; top: 9px; right: 9px; min-height: 28px; padding: 4px 7px; border: 0; background: transparent; color: var(--blue); font-size: .7rem; }
.result-meta { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; margin: 0 0 8px; }
.result-meta span { min-width: 0; padding: 7px 8px; border-radius: 8px; background: var(--surface-soft); }
.result-meta small, .result-meta strong { display: block; }
.result-meta small { color: var(--muted); font-size: .65rem; }
.result-meta strong { margin-top: 3px; overflow-wrap: anywhere; font-size: .72rem; }
.copy-actions { display: grid; gap: 6px; }
.copy-actions > div, .copy-actions details > div, .reverse-result > div { display: grid; grid-template-columns: 120px minmax(0, 1fr) auto; gap: 10px; align-items: center; padding: 8px 9px; border: 1px solid var(--border); border-radius: 8px; }
.result-content-grid .copy-actions > div,
.result-content-grid .copy-actions details > div { grid-template-columns: minmax(0, 1fr) auto; gap: 3px 7px; padding: 6px 8px; }
.result-content-grid .copy-actions span { grid-column: 1; grid-row: 1; }
.result-content-grid .copy-actions code { grid-column: 1 / -1; grid-row: 2; }
.result-content-grid .copy-actions div > button { grid-column: 2; grid-row: 1; }
.copy-actions code, .reverse-result code { overflow: hidden; color: var(--text); font-size: .74rem; text-overflow: ellipsis; white-space: nowrap; }
.copy-actions button, .reverse-result div button { min-height: 28px; padding: 3px 7px; border: 0; background: transparent; color: var(--blue); font-size: .7rem; }
.copy-actions details { border: 1px solid var(--border); border-radius: 8px; }
.copy-actions details > div { border: 0; border-top: 1px solid var(--border); border-radius: 0; }
.copy-actions summary { padding: 8px; color: var(--muted); cursor: pointer; font-size: .72rem; font-weight: 700; }
.copy-actions .copy-all { width: 100%; min-height: 36px; border: 1px solid var(--border); background: var(--surface-soft); color: var(--blue); }
.result-content-grid .copy-actions .copy-all { min-height: 32px; margin-top: auto; }

.diagnostics-panel { margin-top: 14px; padding: 17px 19px; }
.diagnostics-title { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; }
.diagnostics-title h2 { margin: 4px 0 0; font-size: 1.02rem; }
.diagnostics-title > span { max-width: 390px; color: var(--muted); font-size: .72rem; line-height: 1.45; text-align: right; }
.diagnostics-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 13px; }
.diagnostics-grid > div { padding: 13px 15px; border-radius: 10px; background: var(--surface-soft); }
.diagnostics-grid h3 { margin: 0 0 8px; font-size: .78rem; }
.diagnostics-grid ul { display: grid; gap: 6px; margin: 0; padding-left: 18px; color: var(--muted); font-size: .75rem; line-height: 1.5; }
.ai-context-button { display: flex; align-items: center; justify-content: space-between; gap: 16px; width: 100%; margin-top: 16px; padding: 12px 14px; border-color: color-mix(in srgb, var(--blue) 26%, var(--border)); background: var(--surface-blue); text-align: left; }
.ai-context-button span { display: grid; gap: 3px; }
.ai-context-button strong { color: var(--text); font-size: .8rem; }
.ai-context-button small { color: var(--muted); font-weight: 550; }
.ai-context-button b { color: var(--blue); }

.secondary-workspace { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: 14px; align-items: start; }
.secondary-workspace:has(> [hidden]) { grid-template-columns: minmax(0, 720px); }
.compact-panel { min-width: 0; }
.secondary-form { display: grid; gap: 14px; }
.secondary-form label, .stacked-field, .compare-inputs label { display: grid; gap: 6px; }
.secondary-form .primary-button { margin-top: 4px; }
.reverse-result { display: grid; gap: 9px; }
.reverse-result > .eyebrow { margin-bottom: 3px; }
.compact-context { margin-top: 8px; }
.batch-result-panel { min-width: 0; }
.batch-summary, .compare-hero { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 16px; }
.batch-summary h2, .compare-hero h2 { margin: 4px 0 0; font-size: 1.1rem; }
.batch-summary > div:last-child { display: flex; gap: 7px; }
.table-scroll { max-height: 460px; overflow: auto; border: 1px solid var(--border); border-radius: 9px; }
table { width: 100%; border-collapse: collapse; font-size: .72rem; }
th { position: sticky; top: 0; z-index: 1; background: var(--surface-soft); color: var(--muted); text-align: left; }
th, td { min-width: 105px; padding: 9px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
td { font-family: "SFMono-Regular", Consolas, monospace; overflow-wrap: anywhere; }
td.ok { color: var(--green); font-family: inherit; font-weight: 750; }
td.error { color: var(--red); font-family: inherit; }
.compare-inputs { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 17px; }
.compare-inputs > div { position: relative; display: grid; gap: 10px; padding: 15px; border: 1px solid var(--border); border-radius: 10px; background: var(--surface-soft); }
.compare-marker { position: absolute; top: -9px; right: 12px; display: grid; width: 26px; height: 26px; place-items: center; border-radius: 50%; background: var(--text); color: var(--surface); font-size: .72rem; font-weight: 850; }
.compare-marker.accent { background: var(--blue); color: white; }
.compare-result-panel { min-width: 0; }
.compare-hero > strong { color: var(--blue); font-size: clamp(1.2rem, 3vw, 2rem); }
.timeline { display: grid; grid-template-columns: minmax(0, 1fr) 55px minmax(0, 1fr); align-items: center; margin: 20px 0; }
.timeline > div { display: grid; gap: 7px; min-width: 0; padding: 13px; border: 1px solid var(--border); border-radius: 9px; background: var(--surface-soft); }
.timeline span { color: var(--blue); font-size: .7rem; font-weight: 850; }
.timeline code { overflow-wrap: anywhere; font-size: .72rem; }
.timeline i { height: 2px; background: var(--border-strong); }
.delta-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.delta-grid > div { display: grid; gap: 6px; min-width: 0; padding: 10px; border-radius: 9px; background: var(--surface-blue); }
.delta-grid code { overflow-wrap: anywhere; font-size: .72rem; }

.privacy-strip { display: flex; gap: 12px; align-items: flex-start; margin-top: 16px; padding: 14px 16px; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); }
.privacy-strip > span { width: 9px; height: 9px; flex: none; margin-top: 4px; border-radius: 50%; background: var(--green); }
.privacy-strip strong { font-size: .8rem; }
.privacy-strip p { margin: 4px 0 0; color: var(--muted); font-size: .74rem; line-height: 1.45; }

dialog { width: min(720px, calc(100% - 28px)); max-height: calc(100vh - 28px); padding: 0; border: 1px solid var(--border); border-radius: 15px; background: var(--surface); color: var(--text); box-shadow: 0 24px 80px rgba(0, 0, 0, .3); }
dialog::backdrop { background: rgba(5, 12, 24, .56); backdrop-filter: blur(3px); }
.context-modal { padding: 22px; }
.context-modal header { display: flex; justify-content: space-between; gap: 20px; }
.context-modal h2 { margin: 4px 0 0; font-size: 1.25rem; }
.context-modal > p { color: var(--muted); font-size: .82rem; line-height: 1.5; }
.context-modal > label { display: block; margin-bottom: 7px; }
.context-modal textarea { min-height: 320px; font-family: "SFMono-Regular", Consolas, monospace; font-size: .73rem; }
.context-modal footer { display: flex; justify-content: flex-end; gap: 8px; margin-top: 14px; }
.icon-button { width: 38px; padding: 0; border-radius: 50%; font-size: 1.25rem; }
.toast { position: fixed; right: 18px; bottom: 18px; z-index: 30; max-width: min(360px, calc(100% - 36px)); padding: 11px 14px; border: 1px solid var(--border); border-radius: 10px; background: var(--text); color: var(--surface); box-shadow: var(--shadow); font-size: .78rem; font-weight: 700; }

@media (max-width: 820px) {
  .primary-grid, .secondary-workspace { grid-template-columns: 1fr; }
  .result-panel { order: 2; }
  .diagnostics-panel { order: 3; }
}

@media (max-width: 600px) {
  .timestamp-app { width: min(100% - 20px, 1120px); padding-top: 18px; }
  .tool-heading { display: grid; align-items: start; grid-template-columns: 46px minmax(0, 1fr); gap: 8px 11px; }
  .tool-heading-icon { width: 46px; height: 46px; border-radius: 12px; }
  .local-badge { width: max-content; margin: 0; grid-column: 2; }
  .mode-tabs { width: 100%; }
  .conversion-panel, .compact-panel, .result-panel, .reverse-result, .batch-result-panel, .compare-result-panel, .diagnostics-panel { padding: 16px; }
  .unit-control, .diagnostics-grid, .compare-inputs, .delta-grid, .result-content-grid { grid-template-columns: 1fr; }
  .result-meta { grid-template-columns: 1fr 1fr; }
  .copy-actions > div, .copy-actions details > div, .reverse-result > div { grid-template-columns: 1fr auto; }
  .copy-actions span, .reverse-result span { grid-column: 1 / -1; }
  .diagnostics-title { display: block; }
  .diagnostics-title > span { display: block; margin-top: 9px; text-align: left; }
  .batch-summary, .compare-hero { align-items: flex-start; flex-direction: column; }
  .batch-summary > div:last-child { width: 100%; }
  .batch-summary > div:last-child button { flex: 1; }
  .timeline { grid-template-columns: 1fr; gap: 7px; }
  .timeline i { width: 2px; height: 22px; margin-left: 18px; }
  .context-modal { padding: 16px; }
  .context-modal textarea { min-height: 270px; }
}

@media (max-width: 430px) {
  .mode-tabs { display: flex; overflow-x: auto; }
  .mode-tabs button { flex: 0 0 auto; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}