:root {
  --ink: #16202b; --muted: #5c6b7a; --line: #dde4ea; --bg: #f4f6f8; --card: #ffffff;
  --brand: #14507d; --brand-dark: #0f3d60; --ok: #17724a; --ok-bg: #e7f4ed;
  --bad: #a4232b; --bad-bg: #fbeced; --warn: #8a5a00; --warn-bg: #fdf3e0;
}
* { box-sizing: border-box; }
/* Author rules such as .gate{display:grid} would otherwise defeat the attribute. */
[hidden] { display: none !important; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 15px/1.6 "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
}
h1 { font-size: 1.55rem; margin: 0 0 .2rem; letter-spacing: -.01em; }
h2 { font-size: 1.12rem; margin: 0 0 .75rem; }
h3 { font-size: .98rem; margin: 1.4rem 0 .5rem; }
p { margin: .55rem 0; }
.muted { color: var(--muted); }
.small { font-size: .86rem; }

.gate { display: grid; place-items: center; min-height: 100vh; padding: 1.5rem; }
.gate .card {
  background: var(--card); padding: 2rem; border-radius: 10px; width: min(380px, 100%);
  border: 1px solid var(--line); box-shadow: 0 6px 28px rgba(20, 40, 60, .08);
}
.gate label { display: block; margin: 1rem 0 0; font-size: .87rem; color: var(--muted); }
.gate input {
  display: block; width: 100%; margin-top: .3rem; padding: .6rem .7rem; font: inherit;
  border: 1px solid var(--line); border-radius: 6px; background: #fff; color: var(--ink);
}
.gate input:focus-visible { outline: 2px solid var(--brand); outline-offset: 1px; }
.gate button { margin-top: 1.4rem; width: 100%; }

.top {
  display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem;
  padding: 1.6rem clamp(1rem, 4vw, 2.5rem); background: var(--card); border-bottom: 1px solid var(--line);
}
main { max-width: 940px; margin: 0 auto; padding: 1.5rem clamp(1rem, 4vw, 2rem) 1rem; }
footer { max-width: 940px; margin: 0 auto; padding: 0 clamp(1rem, 4vw, 2rem) 3rem; }

.panel {
  background: var(--card); border: 1px solid var(--line); border-radius: 10px;
  padding: 1.35rem clamp(1rem, 3vw, 1.6rem); margin-bottom: 1.1rem;
}
.panel.action { border-color: #c8d8e6; box-shadow: 0 2px 14px rgba(20, 80, 125, .07); }

button { font: inherit; border-radius: 6px; cursor: pointer; padding: .6rem 1.1rem; border: 1px solid transparent; }
button:disabled { opacity: .5; cursor: not-allowed; }
.primary { background: var(--brand); color: #fff; font-weight: 600; }
.primary:hover:not(:disabled) { background: var(--brand-dark); }
.secondary { background: #eaf1f7; color: var(--brand-dark); border-color: #c8d8e6; font-weight: 600; }
.secondary:hover:not(:disabled) { background: #dde9f3; }
.ghost { background: transparent; color: var(--muted); border-color: var(--line); }
.ghost:hover:not(:disabled) { color: var(--ink); border-color: var(--muted); }
.buttons { display: flex; flex-wrap: wrap; gap: .6rem; margin: 1rem 0 .4rem; }
.linkbtn {
  display: inline-block; padding: .55rem 1rem; background: #eaf1f7; color: var(--brand-dark);
  border: 1px solid #c8d8e6; border-radius: 6px; text-decoration: none; font-weight: 600;
}
.linkbtn:hover { background: #dde9f3; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: .7rem; margin-bottom: 1.1rem; }
.cards div { background: #f7fafc; border: 1px solid var(--line); border-radius: 8px; padding: .8rem .9rem; }
.cards strong { display: block; font-size: 1.42rem; font-variant-numeric: tabular-nums; letter-spacing: -.02em; }
.cards span { font-size: .82rem; color: var(--muted); }

.tablewrap { overflow-x: auto; margin: .6rem 0; }
table { border-collapse: collapse; width: 100%; font-size: .89rem; }
th, td { text-align: left; padding: .5rem .65rem; border-bottom: 1px solid var(--line); white-space: nowrap; }
th { color: var(--muted); font-weight: 600; font-size: .8rem; text-transform: uppercase; letter-spacing: .03em; }
td:nth-child(n+3), th:nth-child(n+3) { font-variant-numeric: tabular-nums; }
#testTable td:nth-child(2) { white-space: normal; min-width: 190px; }
code { font-family: ui-monospace, "Cascadia Mono", Consolas, monospace; font-size: .82em; }

.result { margin-top: 1.2rem; padding-top: 1.1rem; border-top: 1px solid var(--line); }
.bar { height: 8px; background: #e6edf3; border-radius: 99px; overflow: hidden; margin: .7rem 0 .5rem; }
.bar > div { height: 100%; width: 0; background: var(--brand); transition: width .2s ease; }
.pill { display: inline-block; padding: .12rem .5rem; border-radius: 99px; font-size: .8rem; font-weight: 600; }
.pill.ok { background: var(--ok-bg); color: var(--ok); }
.pill.bad { background: var(--bad-bg); color: var(--bad); }
.verdict { margin-top: .9rem; padding: .75rem .9rem; border-radius: 7px; font-weight: 600; }
.verdict.ok { background: var(--ok-bg); color: var(--ok); }
.verdict.bad { background: var(--bad-bg); color: var(--bad); }
.error { background: var(--bad-bg); color: var(--bad); padding: .7rem .85rem; border-radius: 7px; margin-top: .9rem; }
.warn { background: var(--warn-bg); color: var(--warn); padding: .7rem .85rem; border-radius: 7px; }

@media (max-width: 560px) {
  .top { flex-direction: column; }
  .buttons button, .buttons { width: 100%; }
}