:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #566176;
  --paper: #ffffff;
  --canvas: #f3f6fb;
  --border: #c8d0df;
  --brand: #174ea6;
  --brand-dark: #103d82;
  --error: #9b1c1c;
  --error-bg: #fff0f0;
  --warning: #7a4b00;
  --warning-bg: #fff7df;
  --info: #155b75;
  --info-bg: #ebf8fc;
  --success: #17663a;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
body { margin: 0; color: var(--ink); background: var(--canvas); line-height: 1.55; }
a { color: var(--brand); }
.skip-link { position: absolute; left: 1rem; top: -4rem; padding: .65rem 1rem; background: var(--ink); color: white; z-index: 10; }
.skip-link:focus { top: 1rem; }
.site-header, main, footer { width: min(1120px, calc(100% - 2rem)); margin-inline: auto; }
.site-header { display: flex; justify-content: space-between; gap: 2rem; align-items: end; padding: 3.5rem 0 2rem; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: .5rem; font-size: clamp(2.25rem, 6vw, 4.5rem); line-height: .98; letter-spacing: -.055em; }
h2 { margin-bottom: .55rem; font-size: clamp(1.35rem, 3vw, 2rem); line-height: 1.15; }
h3 { font-size: 1rem; }
.eyebrow, .step { margin-bottom: .4rem; color: var(--brand); font-size: .76rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.lede { max-width: 680px; margin-bottom: 0; color: var(--muted); font-size: 1.1rem; }
.test-link { white-space: nowrap; font-weight: 700; }
main { display: grid; grid-template-columns: minmax(0, 1.7fr) minmax(280px, .8fr); gap: 1.25rem; align-items: start; }
.tool-card, .results, .service-card, .test-shell { border: 1px solid var(--border); border-radius: 16px; background: var(--paper); box-shadow: 0 12px 35px rgba(23, 32, 51, .07); }
.tool-card, .results { grid-column: 1; padding: clamp(1.2rem, 3vw, 2rem); }
.service-card { grid-column: 2; grid-row: 1 / span 2; position: sticky; top: 1rem; padding: 1.5rem; border-top: 5px solid var(--brand); }
.section-heading { display: flex; justify-content: space-between; gap: 1rem; align-items: start; }
.limit-note, .read-only-pill { display: inline-block; padding: .3rem .6rem; border-radius: 999px; background: #e8eef9; color: #283c62; font-size: .78rem; font-weight: 750; white-space: nowrap; }
.privacy-note, .scope-note { padding: .85rem 1rem; border-left: 4px solid var(--brand); background: #eef4ff; color: #293750; }
.file-row { display: flex; gap: 1.25rem; align-items: end; margin: 1.25rem 0; }
.file-row p { margin-bottom: .5rem; color: var(--muted); }
.or-divider { padding-bottom: .45rem; color: var(--muted); font-weight: 700; }
label { display: block; margin-bottom: .4rem; font-weight: 750; }
input[type="file"] { display: block; max-width: 100%; }
textarea { width: 100%; min-height: 290px; resize: vertical; border: 1px solid #8995a8; border-radius: 10px; padding: 1rem; color: #111827; background: #fbfcff; font: .9rem/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; tab-size: 2; }
.actions { display: flex; gap: .75rem; margin-top: 1rem; }
button, .contact-button { min-height: 44px; border: 2px solid transparent; border-radius: 9px; padding: .65rem 1.15rem; font: inherit; font-weight: 800; cursor: pointer; }
.primary, .contact-button { background: var(--brand); color: white; }
.primary:hover, .contact-button:hover { background: var(--brand-dark); }
.secondary { border-color: #526079; background: white; color: var(--ink); }
.contact-button { display: inline-flex; align-items: center; text-decoration: none; }
:focus-visible { outline: 3px solid #f0a500; outline-offset: 3px; }
.status { min-height: 1.6em; margin: 1rem 0 0; font-weight: 700; }
.status.error { color: var(--error); }
.status.warning { color: var(--warning); }
.status.success { color: var(--success); }
.status.neutral { color: var(--muted); }
.summary-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: .75rem; margin: 1.25rem 0; }
.summary-grid article { padding: 1rem; border: 1px solid var(--border); border-radius: 10px; background: #f8faff; }
.summary-grid span { display: block; font-size: 2rem; font-weight: 850; line-height: 1; }
.summary-grid strong { display: block; margin-top: .35rem; color: var(--muted); }
.summary-grid .error-card { border-color: #e3a9a9; background: var(--error-bg); }
.summary-grid .warning-card { border-color: #dfc078; background: var(--warning-bg); }
.summary-grid .info-card { border-color: #8dc4d7; background: var(--info-bg); }
.calendar-meta, .event-card dl { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: .35rem 1rem; }
dt { font-weight: 800; }
dd { margin: 0; overflow-wrap: anywhere; }
.diagnostics { display: grid; gap: .75rem; padding: 0; list-style: none; }
.diagnostic { border: 1px solid var(--border); border-left-width: 5px; border-radius: 9px; padding: .9rem 1rem; }
.diagnostic-error { border-left-color: var(--error); background: var(--error-bg); }
.diagnostic-warning { border-left-color: #a26400; background: var(--warning-bg); }
.diagnostic-info { border-left-color: var(--info); background: var(--info-bg); }
.diagnostic-heading { display: flex; flex-wrap: wrap; gap: .55rem; align-items: center; }
.diagnostic p { margin: .55rem 0 0; }
.severity { border-radius: 5px; padding: .12rem .45rem; color: white; font-size: .72rem; font-weight: 850; text-transform: uppercase; }
.severity-error { background: var(--error); }
.severity-warning { background: #7a4b00; }
.severity-info { background: var(--info); }
code { border-radius: 4px; padding: .12rem .35rem; background: rgba(255,255,255,.7); color: #263044; }
details { margin-top: 1.25rem; }
summary { cursor: pointer; font-weight: 800; }
.event-details { display: grid; gap: .75rem; margin-top: .8rem; }
.event-card { padding: 1rem; border: 1px solid var(--border); border-radius: 9px; background: #fafbfe; }
.event-card h3 { margin-bottom: .6rem; }
footer { padding: 2rem 0 3rem; color: var(--muted); font-size: .9rem; }
.test-page main { display: block; }
.test-shell { padding: clamp(1.2rem, 3vw, 2rem); }
.test-summary { padding: 1rem; border-radius: 8px; font-weight: 850; }
.test-summary.pass { background: #e8f7ee; color: var(--success); }
.test-summary.fail { background: var(--error-bg); color: var(--error); }
.test-results { display: grid; gap: .55rem; padding-left: 1.5rem; }
.result-pass strong { color: var(--success); }
.result-fail strong { color: var(--error); }
.result-fail pre { white-space: pre-wrap; overflow-wrap: anywhere; }

@media (max-width: 800px) {
  .site-header { display: block; padding-top: 2rem; }
  .test-link { display: inline-block; margin-top: 1rem; }
  main { grid-template-columns: 1fr; }
  .tool-card, .results, .service-card { grid-column: 1; }
  .service-card { grid-row: auto; position: static; }
  .section-heading, .file-row { display: block; }
  .limit-note, .read-only-pill { margin-bottom: 1rem; }
  .or-divider { display: block; padding: .75rem 0; }
  .summary-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 430px) {
  .summary-grid { grid-template-columns: 1fr; }
  .actions { flex-direction: column; }
  button { width: 100%; }
  .calendar-meta, .event-card dl { grid-template-columns: 1fr; }
  dd { margin-bottom: .4rem; }
}