:root {
    color-scheme: light;
    --page: #f5f7f9;
    --surface: #ffffff;
    --ink: #182b3c;
    --muted: #536575;
    --line: #dce3e9;
    --accent: #235bc3;
    --positive: #226247;
    --negative: #98462e;
    --pending: #586777;
    font-family: "Segoe UI", -apple-system, BlinkMacSystemFont, Arial, sans-serif;
    font-synthesis: none;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--page); color: var(--ink); font-size: 16px; line-height: 1.55; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
button:focus-visible, a:focus-visible { outline: 3px solid #336bcc; outline-offset: 4px; }
a { color: var(--accent); }
.page-shell { width: min(100% - 96px, 1032px); margin: 0 auto; }
.site-header { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding: 29px 0; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 650; font-size: 19px; letter-spacing: -.025em; text-decoration: none; }
.brand-mark { color: var(--accent); flex-shrink: 0; }
.stage { color: var(--muted); font-size: 13px; }
main { max-width: 720px; margin: 65px auto 72px; }
.intro { margin-bottom: 31px; }
h1 { margin: 0 0 17px; max-width: 16ch; font-size: clamp(32px, 3.1vw, 44px); line-height: 1.12; font-weight: 640; letter-spacing: -.034em; text-wrap: balance; }
.intro p { margin: 0; max-width: 65ch; color: var(--muted); font-size: 17px; line-height: 1.6; }
.diagnostics { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; overflow: hidden; }
.panel-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 24px 30px 9px; }
h2 { margin: 0; font-size: 17px; font-weight: 650; letter-spacing: -.01em; }
.badge { display: inline-flex; align-items: center; gap: 7px; font-size: 12px; font-weight: 600; color: var(--pending); white-space: nowrap; }
.badge[data-state="ok"] { color: var(--positive); }
.badge[data-state="error"] { color: var(--negative); }
.status-dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.status-list { margin: 0; padding: 0 30px; }
.status-row { display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 60px; padding: 13px 0; border-bottom: 1px solid var(--line); }
.status-row:last-child { border: 0; }
dt { color: var(--muted); font-size: 14px; }
dd { margin: 0; text-align: right; font-size: 14px; font-weight: 550; }
dd[data-state="ok"] { color: var(--positive); }
dd[data-state="error"] { color: var(--negative); }
.ip-row dd { display: flex; align-items: center; justify-content: flex-end; gap: 6px; }
.ip-value { font-family: Consolas, "Liberation Mono", monospace; font-size: 15px; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.copy-button { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; padding: 0; flex-shrink: 0; border: 0; border-radius: 7px; background: transparent; color: var(--muted); cursor: pointer; }
.copy-button:hover:not(:disabled) { background: #edf2f7; color: var(--ink); }
.copy-button:disabled { opacity: .4; cursor: default; }
.panel-actions { display: flex; align-items: center; gap: 18px; padding: 21px 30px 0; border-top: 1px solid var(--line); }
.primary-button { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 44px; padding: 10px 16px; border: 0; border-radius: 9px; background: var(--accent); color: #fff; font-size: 14px; font-weight: 550; cursor: pointer; transition: background-color 120ms ease-out; }
.primary-button:hover:not(:disabled) { background: #184aab; }
.primary-button:active:not(:disabled) { background: #143e90; }
.primary-button:disabled { background: #647fba; cursor: wait; }
.checked-at { font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; }
.result-message { margin: 0; min-height: 71px; padding: 16px 30px 24px; color: var(--muted); font-size: 13px; }
.noscript { padding: 0 30px 24px; color: var(--negative); }
.scope-note { display: flex; align-items: flex-start; gap: 14px; margin-top: 27px; padding: 0 1px; }
.scope-icon { flex-shrink: 0; color: var(--muted); margin-top: 2px; }
.scope-note h2 { font-size: 14px; line-height: 1.7; }
.scope-note p { margin: 4px 0 0; color: var(--muted); font-size: 13px; line-height: 1.65; max-width: 74ch; }
.site-footer { display: flex; justify-content: space-between; gap: 20px; padding: 23px 0 29px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }

@media (max-width: 760px) {
    .page-shell { width: calc(100% - 48px); }
    main { margin: 45px auto 52px; }
    .panel-heading { padding-inline: 24px; }
    .status-list { padding-inline: 24px; }
    .panel-actions { padding-inline: 24px; }
    .result-message { padding-inline: 24px; }
}

@media (max-width: 480px) {
    .page-shell { width: calc(100% - 36px); }
    .site-header { padding: 21px 0; gap: 14px; }
    .brand { font-size: 17px; gap: 6px; }
    .brand-mark { width: 24px; height: 24px; }
    .stage { font-size: 11px; max-width: 90px; line-height: 1.4; text-align: right; }
    main { margin-top: 33px; }
    h1 { font-size: 32px; letter-spacing: -.025em; margin-bottom: 15px; }
    .intro p { font-size: 15px; }
    .intro { margin-bottom: 25px; }
    .panel-heading { padding: 20px 19px 7px; }
    .panel-heading h2 { font-size: 16px; }
    .status-list { padding-inline: 19px; }
    .status-row { gap: 10px; min-height: 64px; }
    dt { font-size: 13px; max-width: 51%; }
    dd { font-size: 13px; max-width: 57%; }
    .ip-value { font-size: 13px; }
    .copy-button { width: 27px; }
    .ip-row dd { gap: 1px; }
    .panel-actions { align-items: flex-start; flex-direction: column; gap: 10px; padding: 18px 19px 0; }
    .primary-button { width: 100%; }
    .result-message { padding: 13px 19px 21px; min-height: 86px; }
    .scope-note { gap: 11px; margin-top: 23px; }
    .site-footer { flex-direction: column; gap: 4px; padding-top: 19px; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { transition-duration: 0s !important; }
}