:root {
  /* HUFF DATA brand: blue gradient #1C68B8 -> #2C98F4, charcoal #231F20 */
  --brand-blue: #1C68B8;
  --brand-blue-light: #2C98F4;
  --brand-charcoal: #231F20;
  --brand-gradient: linear-gradient(90deg, var(--brand-blue), var(--brand-blue-light));

  --bg: #f4f6f9;
  --surface: #ffffff;
  --surface-2: #eef2f7;
  --border: #dde3ea;
  --text: #231F20;
  --muted: #5b6168;
  --primary: #1C68B8;
  --primary-hover: #17589c;
  --primary-soft: #e6f0fb;
  --on-primary: #ffffff;
  --ok: #0f7b4b;
  --ok-soft: #e3f6ec;
  --warn: #9a5b00;
  --warn-soft: #fff4dc;
  --danger: #c0262d;
  --danger-soft: #fde8e8;
  --info: #1C68B8;
  --info-soft: #e6f0fb;
  --focus: 0 0 0 3px rgba(44, 152, 244, .45);
  --radius: 12px;
  --shadow: 0 1px 2px rgba(35, 31, 32, .05), 0 4px 16px rgba(35, 31, 32, .07);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  /* Footer is brand charcoal in both themes. */
  --footer-bg: #231F20;
  --footer-text: #ffffff;
  --footer-muted: #b5b9be;
  --footer-link: #4fa9f5;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141516;
    --surface: #1d1e20;
    --surface-2: #26282b;
    --border: #34373b;
    --text: #eceef0;
    --muted: #a3a8ae;
    --primary: #2C98F4;
    --primary-hover: #4fa9f5;
    --primary-soft: #13304d;
    --on-primary: #0b1622;
    --ok: #4fd18f;
    --ok-soft: #133224;
    --warn: #f3b74f;
    --warn-soft: #362a12;
    --danger: #ff6b6f;
    --danger-soft: #3a1719;
    --info: #4fa9f5;
    --info-soft: #13304d;
    --focus: 0 0 0 3px rgba(79, 169, 245, .5);
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 6px 20px rgba(0, 0, 0, .25);
    --footer-bg: #0f1011;
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
main { flex: 1; padding: 32px 0 48px; }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .5em; }
h1 { font-size: 1.75rem; letter-spacing: -.01em; }
h2 { font-size: 1.2rem; }
h3 { font-size: 1rem; }
p { margin: 0 0 1em; }
a { color: var(--primary); }
code { font-family: var(--mono); font-size: .88em; background: var(--surface-2); padding: .1em .35em; border-radius: 5px; word-break: break-all; }
.mono { font-family: var(--mono); }
.muted { color: var(--muted); }
.small { font-size: .875rem; }
.center { text-align: center; }
.nowrap { white-space: nowrap; }
.break { word-break: break-all; }
.sr-only { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); border: 0; }
[hidden] { display: none !important; }

.container { width: 100%; max-width: 1040px; margin: 0 auto; padding: 0 16px; }
.container.narrow { max-width: 760px; }

/* header / footer */
.site-header { background: var(--surface); border-bottom: 1px solid var(--border); position: relative; }
.site-header::before { content: ""; position: absolute; inset: 0 0 auto; height: 4px; background: var(--brand-gradient); }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 80px; padding-top: 4px; }
.brand { display: flex; align-items: center; flex: none; border-radius: 6px; }
.brand:focus-visible { outline: none; box-shadow: var(--focus); }
.brand img { display: block; width: 304px; height: 56px; }
.site-nav { display: flex; gap: 4px; }
.site-nav a { color: var(--muted); text-decoration: none; padding: 8px 12px; border-radius: 8px; font-weight: 500; font-size: .95rem; }
.site-nav a:hover { color: var(--text); background: var(--surface-2); }
.site-nav a[aria-current="page"] { color: var(--primary); background: var(--primary-soft); }
.site-footer { padding: 28px 0 24px; font-size: .85rem; text-align: center; background: var(--footer-bg); color: var(--footer-muted); position: relative; }
.site-footer::before { content: ""; position: absolute; inset: 0 0 auto; height: 3px; background: var(--brand-gradient); }
.footer-inner { display: flex; flex-direction: column; align-items: center; gap: 10px; }
.footer-inner p { margin: 0; }
.sponsor-logo { display: inline-block; border-radius: 6px; }
.sponsor-logo img { display: block; width: 280px; height: auto; max-width: 100%; }
.sponsor-logo:focus-visible { outline: none; box-shadow: var(--focus); }
.sponsor-text { color: var(--footer-text); font-size: .9rem; }
.sponsor-text a { color: var(--footer-link); font-weight: 600; text-decoration: none; }
.sponsor-text a:hover { text-decoration: underline; }
.footer-note { font-size: .8rem; max-width: 560px; }

/* hero / features */
.hero { text-align: center; margin: 8px 0 28px; }
.hero h1 { font-size: clamp(1.6rem, 4vw, 2.3rem); }
.hero p { color: var(--muted); max-width: 600px; margin: 0 auto; }
.hero .accent { color: var(--primary); }
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 32px; }
.features h3 { margin-bottom: .3em; }
.features p { color: var(--muted); font-size: .92rem; margin: 0; }

/* FAQ */
.faq { margin-top: 40px; }
.faq > h2 { font-size: 1.35rem; margin-bottom: 14px; }
.faq details { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; margin-bottom: 8px; }
.faq summary { cursor: pointer; padding: 14px 18px; list-style: none; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 1.3rem; font-weight: 600; color: var(--primary); flex: none; line-height: 1; }
.faq details[open] summary::after { content: "\2212"; }
.faq summary:focus-visible { outline: none; box-shadow: var(--focus); border-radius: 10px; }
.faq summary h3 { margin: 0; font-size: 1rem; }
.faq details p { margin: 0; padding: 0 18px 16px; color: var(--muted); }

/* cards */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; margin-bottom: 20px; }

/* tabs */
.tabs { display: flex; gap: 4px; background: var(--surface-2); padding: 4px; border-radius: 10px; margin-bottom: 20px; overflow-x: auto; }
.tab { flex: 1; white-space: nowrap; border: 0; background: transparent; color: var(--muted); padding: 9px 12px; border-radius: 7px; font: inherit; font-weight: 600; font-size: .92rem; cursor: pointer; }
.tab:hover { color: var(--text); }
.tab[aria-selected="true"] { background: var(--surface); color: var(--text); box-shadow: 0 1px 3px rgba(0, 0, 0, .12); }
.tab:focus-visible { outline: none; box-shadow: var(--focus); }

/* forms */
.label { display: block; font-weight: 600; font-size: .92rem; margin: 0 0 6px; }
.input {
  width: 100%;
  font: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 10px 12px;
  transition: border-color .15s, box-shadow .15s;
}
textarea.input { resize: vertical; min-height: 80px; }
.input:focus { outline: none; border-color: var(--primary); box-shadow: var(--focus); }
select.input { cursor: pointer; }
.hint { color: var(--muted); font-size: .84rem; margin: 6px 0 0; }
.field-row { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-top: 8px; flex-wrap: wrap; }
.field-row .hint { margin: 0; }
.linked-hint { flex: 1; min-width: 0; }
.input-group { display: flex; gap: 6px; }
.input-group .input { flex: 1; min-width: 0; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.options { border: 0; border-top: 1px solid var(--border); margin: 24px 0 0; padding: 20px 0 0; }
.options > * + * { margin-top: 18px; }
input[type="range"] { width: 100%; accent-color: var(--primary); margin: 10px 0 0; }
input[type="checkbox"], input[type="radio"] { accent-color: var(--primary); width: 16px; height: 16px; margin: 0; flex: none; }
.checks { display: flex; flex-wrap: wrap; gap: 10px 18px; }
.checks label { display: flex; align-items: center; gap: 7px; font-size: .92rem; cursor: pointer; }
.checks.stacked { flex-direction: column; gap: 12px; }
.check { align-items: flex-start !important; }
.check input { margin-top: 4px; }
.check .hint { margin: 0; }
.range-label { display: block; font-size: .92rem; margin-bottom: 10px; }

.seg { display: inline-flex; background: var(--surface-2); padding: 3px; border-radius: 9px; gap: 2px; }
.seg label { position: relative; cursor: pointer; }
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg label:has(input) { padding: 6px 14px; border-radius: 7px; font-size: .88rem; font-weight: 600; color: var(--muted); }
.seg label:has(input:checked) { background: var(--surface); color: var(--text); box-shadow: 0 1px 3px rgba(0, 0, 0, .12); }
.seg label:has(input:focus-visible) { box-shadow: var(--focus); }

/* generator */
.meter { height: 6px; background: var(--border); border-radius: 3px; overflow: hidden; }
.meter span { display: block; height: 100%; width: 0; background: var(--ok); transition: width .2s; }
.meter span[data-level="weak"] { background: var(--danger); }
.meter span[data-level="ok"] { background: var(--warn); }
.gen-opts { margin: 12px 0; }

/* buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  font: inherit; font-weight: 600; font-size: .94rem; line-height: 1.2;
  padding: 10px 16px; border-radius: 9px; border: 1px solid transparent;
  cursor: pointer; text-decoration: none; white-space: nowrap;
  transition: background .15s, border-color .15s, color .15s;
}
.btn:focus-visible { outline: none; box-shadow: var(--focus); }
.btn:disabled { opacity: .6; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: var(--on-primary); }
.btn-primary:hover:not(:disabled) { background: var(--primary-hover); }
.btn-secondary { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn-secondary:hover:not(:disabled) { background: var(--surface-2); }
.btn-ghost { background: transparent; color: var(--primary); }
.btn-ghost:hover:not(:disabled) { background: var(--primary-soft); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover:not(:disabled) { filter: brightness(1.08); }
.btn.danger { color: var(--danger); }
.btn.danger:hover:not(:disabled) { background: var(--danger-soft); }
.btn-sm { padding: 6px 11px; font-size: .86rem; }
.btn-lg { padding: 13px 20px; font-size: 1rem; }
.btn-block { width: 100%; margin-top: 20px; }

/* notices & badges */
.notice { padding: 12px 14px; border-radius: 9px; background: var(--info-soft); color: var(--text); font-size: .92rem; margin: 16px 0 0; border: 1px solid transparent; }
.notice.warn { background: var(--warn-soft); }
.notice.error { background: var(--danger-soft); color: var(--danger); font-weight: 500; }
.badge { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: .76rem; font-weight: 700; background: var(--surface-2); color: var(--muted); letter-spacing: .01em; white-space: nowrap; }
.badge.ok { background: var(--ok-soft); color: var(--ok); }
.badge.warn { background: var(--warn-soft); color: var(--warn); }
.badge.danger { background: var(--danger-soft); color: var(--danger); }
.badge.info { background: var(--info-soft); color: var(--info); }

/* result */
.result-head { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.result-head h2 { margin: 0; }
.link-box { display: flex; gap: 8px; }
.link-box .input { flex: 1; min-width: 0; font-size: .9rem; }
.result-grid { display: grid; grid-template-columns: auto 1fr; gap: 24px; align-items: start; margin-top: 20px; }
.result-actions { display: flex; flex-direction: column; align-items: flex-start; gap: 10px; }
.qr-wrap canvas { display: block; border-radius: 10px; border: 1px solid var(--border); background: #fff; }
.qr-wrap.center canvas { margin: 0 auto; }

/* view page */
.view-card { padding: 32px; }
.loading { display: flex; align-items: center; justify-content: center; gap: 10px; color: var(--muted); padding: 32px 0; }
.spinner { width: 18px; height: 18px; border: 2px solid var(--border); border-top-color: var(--primary); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.state { text-align: center; padding: 8px 0; }
.state h1 { font-size: 1.4rem; }
.state p { max-width: 480px; margin-left: auto; margin-right: auto; }
.state-icon { width: 56px; height: 56px; margin: 0 auto 16px; border-radius: 50%; display: grid; place-items: center; font-size: 1.5rem; font-weight: 800; background: var(--primary-soft); color: var(--primary); }
.state-icon.gone { background: var(--surface-2); color: var(--muted); }
.state-icon.warn { background: var(--warn-soft); color: var(--warn); }
.gate-form { max-width: 380px; margin: 8px auto 0; }
.gate-form .btn-block { margin-top: 14px; }
.content-title { font-size: 1.3rem; }
.secret-box { background: var(--surface-2); border: 1px solid var(--border); border-radius: 10px; padding: 16px; margin: 12px 0; max-height: 60vh; overflow: auto; }
.secret-text { margin: 0; white-space: pre-wrap; word-break: break-word; font-size: 1rem; transition: filter .15s; }
.secret-text.blurred { filter: blur(7px); user-select: none; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.actions.end { justify-content: flex-end; margin-top: 20px; }
.raw { margin-top: 12px; }
.raw summary { cursor: pointer; color: var(--primary); font-weight: 600; font-size: .92rem; }
.raw .secret-text { margin-top: 10px; padding: 12px; background: var(--surface-2); border-radius: 8px; }

/* manage / list */
.page-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; margin-bottom: 20px; flex-wrap: wrap; }
.page-head h1 { margin: 6px 0 4px; word-break: break-word; }
.page-head p { margin: 0; }
.page-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.title-row { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.stats { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 18px; margin: 0; }
.stat dt { color: var(--muted); font-size: .8rem; font-weight: 600; text-transform: uppercase; letter-spacing: .04em; }
.stat dd { margin: 4px 0 0; font-weight: 600; }
.table-wrap { overflow-x: auto; margin: 0 -24px -24px; }
table.audit { width: 100%; border-collapse: collapse; font-size: .88rem; }
.audit th, .audit td { text-align: left; padding: 10px 24px 10px 0; border-top: 1px solid var(--border); vertical-align: top; }
.audit th:first-child, .audit td:first-child { padding-left: 24px; }
.audit th { color: var(--muted); font-weight: 600; font-size: .78rem; text-transform: uppercase; letter-spacing: .04em; }
.audit .ua { max-width: 320px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--muted); }
.filters { margin-bottom: 16px; }
.push-list { list-style: none; padding: 0; margin: 0; }
.push-item { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 16px 20px; margin-bottom: 10px; }
.push-main { min-width: 0; }
.push-title { display: block; margin: 6px 0 2px; font-weight: 600; color: var(--text); text-decoration: none; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.push-title:hover { color: var(--primary); }
.push-main p { margin: 0; }
.push-actions { display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-end; flex: none; }

/* toast */
.toast { position: fixed; left: 50%; bottom: 24px; transform: translate(-50%, 20px); opacity: 0; pointer-events: none; background: var(--text); color: var(--bg); padding: 10px 18px; border-radius: 9px; font-weight: 600; font-size: .92rem; box-shadow: var(--shadow); transition: opacity .2s, transform .2s; z-index: 100; max-width: calc(100% - 32px); }
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.error { background: var(--danger); color: #fff; }

@media (max-width: 680px) {
  main { padding-top: 20px; }
  .card, .view-card { padding: 18px; }
  .grid-2, .features { grid-template-columns: 1fr; }
  .features { gap: 14px; }
  .result-grid { grid-template-columns: 1fr; justify-items: center; }
  .result-actions { align-items: stretch; width: 100%; }
  .link-box { flex-direction: column; }
  .push-item { flex-direction: column; align-items: stretch; }
  .push-actions { justify-content: flex-start; }
  .table-wrap { margin: 0 -18px -18px; }
  .audit th:first-child, .audit td:first-child { padding-left: 18px; }
  .tab { font-size: .82rem; padding: 8px 4px; }
  .header-inner { gap: 8px; }
  .site-nav { gap: 0; flex: none; }
  .site-nav a { padding: 7px 8px; font-size: .88rem; }
  .nav-extra { display: none; }
  .header-inner { height: 64px; }
  .brand img { width: 174px; height: 32px; }
  .sponsor-logo img { width: 220px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }

/* generator card */
.gen-card { margin-bottom: 24px; }
.gen-card .hint code { white-space: nowrap; }
.gen-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.gen-head h2 { margin: 0; }
.gen-output { display: flex; align-items: center; gap: 8px; background: var(--surface-2); border: 1px solid var(--border); border-radius: 10px; padding: 8px 8px 8px 16px; margin-bottom: 10px; }
.gen-output output { flex: 1; min-width: 0; font-size: 1.3rem; font-weight: 600; letter-spacing: .02em; word-break: break-all; padding: 4px 0; }
.icon-btn { padding: 8px; }
.meter span[data-level="good"] { background: var(--ok); opacity: .75; }
.gen-controls { margin-top: 14px; }
.gen-controls input[type="range"] { margin: 0 0 12px; }
.gen-controls .range-label { margin-bottom: 0; }
.gen-foot { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--border); }
.gen-foot .hint { margin: 0; flex: 1; min-width: 220px; }
@media (max-width: 680px) {
  .gen-output { padding-left: 12px; gap: 4px; }
  .gen-output output { font-size: 1rem; letter-spacing: 0; }
  .icon-btn { padding: 6px; }
}
@media (max-width: 400px) {
  .gen-output { flex-wrap: wrap; padding: 10px 12px; }
  .gen-output output { flex-basis: 100%; }
  .gen-output .icon-btn { margin-left: auto; }
}
@media (max-width: 374px) {
  .brand img { width: 157px; height: 29px; }
  .site-nav a { padding: 7px 6px; }
}
@media (max-width: 349px) {
  .brand img { width: 141px; height: 26px; }
}