:root {
  color-scheme: light dark;
  --bg: #f3f5f8;
  --panel: #ffffff;
  --text: #14202e;
  --muted: #46566a;
  --border: #c5cedb;
  --focus: #b35a00;
  --button-bg: #0b4f8a;
  --button-text: #ffffff;
  --secondary-bg: #e4eaf2;
  --secondary-text: #14202e;
  --header-bg: #0b2a47;
  --header-text: #ffffff;
  --badge-text: #ffd98a;
  --warning-bg: #fff4d6;
  --warning-text: #4d3600;
  --warning-border: #c58a00;
  --error-bg: #fdeaea;
  --error-text: #6b1111;
  --error-border: #b42318;
  --unknown-bg: #eef1f6;
  --unknown-text: #2b3a4d;
  --radius: 10px;
  --gap: 1rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1722;
    --panel: #17212f;
    --text: #e8eef6;
    --muted: #b4c0d0;
    --border: #33445a;
    --focus: #ffb454;
    --button-bg: #7db8f0;
    --button-text: #08202f;
    --secondary-bg: #243247;
    --secondary-text: #e8eef6;
    --header-bg: #0a1522;
    --header-text: #ffffff;
    --badge-text: #ffd98a;
    --warning-bg: #3a2c00;
    --warning-text: #ffe9a8;
    --warning-border: #d9a400;
    --error-bg: #3d1414;
    --error-text: #ffd0d0;
    --error-border: #ff7b72;
    --unknown-bg: #1f2b3d;
    --unknown-text: #dbe5f1;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 1rem/1.55 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

h1, h2, h3 { line-height: 1.25; margin: 0 0 0.5rem; }
h1 { font-size: clamp(1.5rem, 4vw, 2.1rem); }
h2 { font-size: 1.25rem; }
h3 { font-size: 1.05rem; }
p { margin: 0 0 0.75rem; }
code, pre { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.92em; }
code { overflow-wrap: anywhere; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 0.5rem;
  top: -4rem;
  padding: 0.5rem 0.75rem;
  background: var(--button-bg);
  color: var(--button-text);
  border-radius: var(--radius);
  z-index: 10;
}
.skip-link:focus { top: 0.5rem; }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.file-picker:focus-within { outline: 3px solid var(--focus); outline-offset: 2px; }
main:focus, h2[tabindex="-1"]:focus { outline: none; }

.site-header { background: var(--header-bg); color: var(--header-text); }
.header-inner {
  max-width: 68rem;
  margin: 0 auto;
  padding: 1.25rem 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap);
  justify-content: space-between;
  align-items: flex-end;
}
.title-block { flex: 1 1 22rem; }
.subtitle { margin: 0; max-width: 46rem; }
.badge {
  display: inline-block;
  margin: 0 0 0.5rem;
  padding: 0.1rem 0.6rem;
  border: 1px solid var(--badge-text);
  border-radius: 999px;
  color: var(--badge-text);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.lang-switch { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; }
.lang-switch button {
  min-height: 2.75rem;
  padding: 0.4rem 0.9rem;
  border: 2px solid var(--header-text);
  border-radius: var(--radius);
  background: transparent;
  color: var(--header-text);
  font: inherit;
  cursor: pointer;
}
.lang-switch button[aria-pressed="true"] { background: var(--header-text); color: var(--header-bg); font-weight: 700; }

main { max-width: 68rem; margin: 0 auto; padding: var(--gap); display: grid; gap: var(--gap); }

.validation-warning {
  margin: 0;
  padding: 0.7rem 0.9rem;
  background: var(--warning-bg);
  color: var(--warning-text);
  border-left: 5px solid var(--warning-border);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.top-grid { display: grid; gap: var(--gap); grid-template-columns: repeat(auto-fit, minmax(19rem, 1fr)); }

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
}
.panel-error { background: var(--error-bg); color: var(--error-text); border-color: var(--error-border); }
.result { display: grid; gap: var(--gap); }
.result-region:empty { display: none; }

ul { margin: 0; padding-left: 1.2rem; }
ul.plain { list-style: none; padding: 0; }
ul.plain li { padding: 0.35rem 0; border-top: 1px solid var(--border); }
ul.plain li:first-child { border-top: 0; }
li { margin: 0.25rem 0; }
.note { color: var(--muted); }
.summary-line { font-size: 1.1rem; font-weight: 600; }

.actions { display: flex; flex-wrap: wrap; gap: 0.6rem; margin: 0.5rem 0 0.75rem; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.5rem 1.1rem;
  border: 2px solid transparent;
  border-radius: var(--radius);
  background: var(--button-bg);
  color: var(--button-text);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.button.secondary { background: var(--secondary-bg); color: var(--secondary-text); border-color: var(--border); }
.button:disabled { opacity: 0.6; cursor: not-allowed; }

.details { display: grid; grid-template-columns: minmax(10rem, 14rem) 1fr; gap: 0.35rem 1rem; margin: 0; }
.details dt { color: var(--muted); }
.details dd { margin: 0; overflow-wrap: anywhere; }

table { width: 100%; border-collapse: collapse; }
caption { text-align: left; font-weight: 700; padding-bottom: 0.5rem; }
th, td { text-align: left; vertical-align: top; padding: 0.55rem 0.6rem; border-top: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; }
td.observation.is-unknown {
  background: var(--unknown-bg);
  color: var(--unknown-text);
  border-left: 4px dashed var(--muted);
}

.command {
  margin: 0.5rem 0 0;
  padding: 0.7rem 0.9rem;
  background: var(--unknown-bg);
  color: var(--unknown-text);
  border-radius: var(--radius);
  overflow-x: auto;
}

.site-footer { max-width: 68rem; margin: 0 auto; padding: 0 var(--gap) 2rem; color: var(--muted); }
.noscript { max-width: 68rem; margin: 1rem auto; padding: 0.7rem var(--gap); background: var(--warning-bg); color: var(--warning-text); }

@media (max-width: 640px) {
  .details { grid-template-columns: 1fr; }
  .details dt { margin-top: 0.5rem; }
  table, tbody, tr, td { display: block; width: 100%; }
  thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
  tr { border-top: 1px solid var(--border); padding: 0.35rem 0; }
  td { border-top: 0; padding: 0.2rem 0.4rem; }
  td:first-child { font-weight: 600; }
}

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