/* Synchresis Toolbox — Domain/DNS module
   Responsive (320px → 4K), automatic dark/light, screen-reader first. */

:root {
  color-scheme: light dark;
  --bg: #f6f7f9;
  --bg-elev: #ffffff;
  --bg-sunken: #eef0f3;
  --fg: #1c2024;
  --fg-muted: #5b636c;
  --border: #d6dae0;
  --border-strong: #b9bfc7;
  --accent: #0a5ad6;
  --accent-fg: #ffffff;
  --focus: #0a5ad6;
  --code-bg: #f0f2f5;

  --pass-fg: #0f6b2e;  --pass-bg: #e4f5e9;  --pass-bd: #9bd6ad;
  --warn-fg: #8a5a00;  --warn-bg: #fdf3df;  --warn-bd: #e7c98a;
  --fail-fg: #b3261e;  --fail-bg: #fdeceb;  --fail-bd: #efb0ab;
  --info-fg: #0a4d8c;  --info-bg: #e7f1fb;  --info-bd: #a8cdee;
  --erro-fg: #6a4a00;  --erro-bg: #f3eede;  --erro-bd: #d9c79a;

  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(16,24,40,.06), 0 1px 3px rgba(16,24,40,.10);
  --maxw: 1280px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1116;
    --bg-elev: #171b21;
    --bg-sunken: #1f242c;
    --fg: #e7eaee;
    --fg-muted: #9aa4b0;
    --border: #2b313a;
    --border-strong: #3a4250;
    --accent: #4d92f8;
    --accent-fg: #08111f;
    --focus: #6aa8ff;
    --code-bg: #11151b;

    --pass-fg: #5bd07f;  --pass-bg: #11271a;  --pass-bd: #1f5733;
    --warn-fg: #e6b450;  --warn-bg: #2a2110;  --warn-bd: #5a4413;
    --fail-fg: #ff8077;  --fail-bg: #2c1513;  --fail-bd: #5e2a26;
    --info-fg: #6ab0ff;  --info-bg: #11202f;  --info-bd: #244a6e;
    --erro-fg: #e3c989;  --erro-bg: #262010;  --erro-bd: #574613;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: clamp(15px, 0.9rem + 0.2vw, 18px);
  line-height: 1.5;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

/* Skip link */
.skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--accent); color: var(--accent-fg);
  padding: .6rem 1rem; border-radius: 0 0 var(--radius-sm) 0; font-weight: 600;
}
.skip:focus { left: 0; }

.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding: clamp(1rem, 3vw, 2.5rem); }

a { color: var(--accent); }
a:focus-visible, button:focus-visible, summary:focus-visible, input:focus-visible {
  outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 4px;
}

/* ---- Header / hero ---- */
.masthead { display: flex; flex-wrap: wrap; align-items: baseline; gap: .5rem 1rem; margin-bottom: 1.25rem; }
.brand { font-size: clamp(1.3rem, 1rem + 1.5vw, 2rem); font-weight: 800; letter-spacing: -.02em; margin: 0; }
.brand .dot { color: var(--accent); }
.tagline { color: var(--fg-muted); margin: 0; }

/* ---- Search form ---- */
.search { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius);
  padding: clamp(1rem, 2.5vw, 1.75rem); box-shadow: var(--shadow); }
.search h2 { margin: 0 0 .25rem; font-size: 1.15rem; }
.search p.hint { margin: 0 0 1rem; color: var(--fg-muted); font-size: .95rem; }
.field { display: flex; flex-wrap: wrap; gap: .6rem; }
.field input[type="text"] {
  flex: 1 1 16rem; min-width: 0; font-size: 1.1rem; padding: .8rem 1rem;
  border: 1.5px solid var(--border-strong); border-radius: var(--radius-sm);
  background: var(--bg); color: var(--fg);
}
.field input::placeholder { color: var(--fg-muted); }
.btn {
  flex: 0 0 auto; font-size: 1.05rem; font-weight: 650; cursor: pointer;
  padding: .8rem 1.5rem; border: 0; border-radius: var(--radius-sm);
  background: var(--accent); color: var(--accent-fg);
}
.btn:hover { filter: brightness(1.07); }
.btn:active { filter: brightness(.95); }
.err-msg { margin-top: .75rem; color: var(--fail-fg); font-weight: 600; }

/* ---- Overall summary ---- */
.summary { margin: 1.5rem 0 1rem; background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1rem 1.25rem; box-shadow: var(--shadow); }
.summary .target { font-size: 1.2rem; font-weight: 750; word-break: break-all; }
.summary .verdict { margin: .35rem 0 .75rem; color: var(--fg-muted); }
.tallies { display: flex; flex-wrap: wrap; gap: .5rem; }
.tally { display: inline-flex; align-items: center; gap: .4rem; font-weight: 650; font-size: .92rem;
  padding: .3rem .7rem; border-radius: 999px; border: 1px solid var(--border); background: var(--bg-sunken); }
.tally .n { font-variant-numeric: tabular-nums; }
.progress { margin-top: .85rem; height: 8px; background: var(--bg-sunken); border-radius: 999px; overflow: hidden; }
.progress > i { display: block; height: 100%; width: 0; background: var(--accent); transition: width .3s ease; }

/* ---- Cards grid ---- */
.cards { display: grid; gap: 1.1rem; grid-template-columns: 1fr; align-items: start; }
@media (min-width: 760px)  { .cards { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1500px) { .cards { grid-template-columns: repeat(3, 1fr); } }

.card { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); overflow: hidden; }
.card > header { display: flex; align-items: center; gap: .6rem; padding: .9rem 1.1rem;
  border-bottom: 1px solid var(--border); }
.card > header .ttl { display: flex; flex-direction: column; gap: .15rem; min-width: 0; flex: 1; }
.card > header h3 { margin: 0; font-size: 1.05rem; line-height: 1.25; }
.card > header .grp { font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; color: var(--fg-muted); }
.card .meta-time { font-size: .72rem; color: var(--fg-muted); font-variant-numeric: tabular-nums; }

/* check rows */
.checks { list-style: none; margin: 0; padding: 0; }
.checks > li { border-top: 1px solid var(--border); }
.checks > li:first-child { border-top: 0; }
.crow { display: grid; grid-template-columns: auto 1fr; gap: .1rem .7rem; padding: .7rem 1.1rem; }
.crow .badge { grid-row: span 2; align-self: start; margin-top: .15rem; }
.crow .c-title { font-weight: 650; }
.crow .c-sum { color: var(--fg); grid-column: 2; }
.crow .c-sum.muted { color: var(--fg-muted); }
.crow.lp { grid-template-columns: 1fr; gap: .15rem; }
.crow.lp .c-sum { grid-column: 1; }

/* status badge: icon + text, never colour alone */
.badge { display: inline-flex; align-items: center; gap: .35rem; font-weight: 700; font-size: .78rem;
  padding: .2rem .55rem; border-radius: 999px; border: 1px solid transparent; white-space: nowrap; }
.badge .ico { width: 1em; height: 1em; display: inline-grid; place-items: center; font-size: 1em; }
.s-pass { color: var(--pass-fg); background: var(--pass-bg); border-color: var(--pass-bd); }
.s-warn { color: var(--warn-fg); background: var(--warn-bg); border-color: var(--warn-bd); }
.s-fail { color: var(--fail-fg); background: var(--fail-bg); border-color: var(--fail-bd); }
.s-info { color: var(--info-fg); background: var(--info-bg); border-color: var(--info-bd); }
.s-error { color: var(--erro-fg); background: var(--erro-bg); border-color: var(--erro-bd); }
.s-load { color: var(--fg-muted); background: var(--bg-sunken); border-color: var(--border); }
/* left status stripe on the card header by worst status */
.card.k-pass > header { box-shadow: inset 4px 0 0 var(--pass-fg); }
.card.k-warn > header { box-shadow: inset 4px 0 0 var(--warn-fg); }
.card.k-fail > header { box-shadow: inset 4px 0 0 var(--fail-fg); }
.card.k-info > header { box-shadow: inset 4px 0 0 var(--info-fg); }
.card.k-error > header { box-shadow: inset 4px 0 0 var(--erro-fg); }
.card.k-load > header { box-shadow: inset 4px 0 0 var(--border-strong); }

/* details / guidance */
.crow details { grid-column: 2; margin-top: .35rem; }
.crow details > summary { cursor: pointer; color: var(--accent); font-size: .88rem; font-weight: 600;
  width: max-content; }
.crow details[open] > summary { margin-bottom: .4rem; }
.detail-box { background: var(--code-bg); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: .6rem .75rem; font-family: var(--mono); font-size: .82rem; white-space: pre-wrap;
  word-break: break-word; overflow-x: auto; }
.guidance { margin: .5rem 0 0; padding: .6rem .75rem; border-left: 3px solid var(--accent);
  background: var(--bg-sunken); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; font-size: .9rem; }
.rfcs { margin: .5rem 0 0; display: flex; flex-wrap: wrap; gap: .3rem; }
.rfc { font-size: .72rem; font-family: var(--mono); color: var(--fg-muted);
  background: var(--bg-sunken); border: 1px solid var(--border); border-radius: 6px; padding: .1rem .4rem; }

/* skeleton loading */
.card.loading .checks { padding: .4rem 0; }
.sk { height: .85rem; margin: .55rem 1.1rem; border-radius: 6px;
  background: linear-gradient(90deg, var(--bg-sunken) 25%, var(--border) 37%, var(--bg-sunken) 63%);
  background-size: 400% 100%; animation: shimmer 1.4s ease infinite; }
.sk.w70 { width: 70%; } .sk.w40 { width: 40%; } .sk.w90 { width: 90%; }
@keyframes shimmer { 0% { background-position: 100% 0; } 100% { background-position: -100% 0; } }

.spin { display: inline-block; width: 1em; height: 1em; border: 2px solid var(--border-strong);
  border-top-color: var(--accent); border-radius: 50%; animation: spin .8s linear infinite; vertical-align: -.15em; }
@keyframes spin { to { transform: rotate(360deg); } }

footer.site { margin-top: 2.5rem; padding-top: 1.25rem; border-top: 1px solid var(--border);
  color: var(--fg-muted); font-size: .85rem; }

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

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition: none !important; }
  .sk { background: var(--bg-sunken); }
}