:root {
  --color-bg: #0f1117;
  --color-surface: #1a1d27;
  --color-surface-2: #232733;
  --color-border: #323848;
  --color-text: #e7e9ee;
  --color-muted: #9aa3b2;
  --color-accent: #5b8cff;
  --color-accent-2: #7c5bff;
  --color-accent-contrast: #ffffff;

  --color-ok: #3fb96b;
  --color-ok-bg: #14321f;
  --color-error: #f06363;
  --color-error-bg: #3a1717;
  --color-warn: #e0a93f;
  --color-warn-bg: #352a12;
  --color-info: #5b8cff;
  --color-info-bg: #16213d;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4.5rem;

  --radius: 0.75rem;
  --radius-sm: 0.375rem;
  --shadow: 0 0.5rem 1.5rem rgba(0, 0, 0, 0.35);
  --maxw: 64rem;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background:
    radial-gradient(60rem 40rem at 80% -10%, rgba(124, 91, 255, 0.12), transparent 60%),
    radial-gradient(50rem 30rem at -10% 0%, rgba(91, 140, 255, 0.12), transparent 55%),
    var(--color-bg);
  background-attachment: fixed;
}

a { color: var(--color-accent); }

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--space-2);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: var(--space-1);
  background: var(--color-accent);
  color: var(--color-accent-contrast);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  z-index: 20;
}
.skip-link:focus { left: var(--space-1); }

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

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* ---- Header / nav ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(15, 17, 23, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  min-height: 4rem;
  flex-wrap: wrap;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  text-decoration: none;
  color: var(--color-text);
  font-weight: 700;
}
.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 2.25rem; height: 2.25rem;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-2));
  color: #fff;
  font-family: var(--mono);
  font-size: 1.0625rem;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text small { color: var(--color-muted); font-weight: 400; font-size: 1rem; }
.nav nav { display: flex; align-items: center; gap: var(--space-3); flex-wrap: wrap; }
.nav nav a { color: var(--color-muted); text-decoration: none; }
.nav nav a:hover { color: var(--color-text); }
.nav-cta {
  padding: 0.5rem var(--space-2);
  background: var(--color-accent);
  color: var(--color-accent-contrast) !important;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

/* ---- Sections ---- */
section { padding: var(--space-5) 0; }
section h2 { font-size: 1.75rem; margin: 0 0 var(--space-3); }
section h3 { font-size: 1.1875rem; margin: 0 0 var(--space-1); }

/* ---- Hero ---- */
.hero { padding-top: var(--space-6); }
.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.1;
  margin: 0 0 var(--space-2);
  background: linear-gradient(120deg, #fff, var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lead { font-size: 1.1875rem; color: var(--color-text); max-width: 46rem; margin: 0 0 var(--space-3); }
.hero-points { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-1); max-width: 46rem; }
.hero-points li { position: relative; padding-left: 1.75rem; color: var(--color-muted); }
.hero-points li::before {
  content: "✓"; position: absolute; left: 0; color: var(--color-ok); font-weight: 700;
}
code { font-family: var(--mono); font-size: 0.9375rem; background: var(--color-surface-2); padding: 0.1rem 0.35rem; border-radius: 4px; }

/* ---- Run / form ---- */
.run { padding-top: var(--space-3); }
.validate-form {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-3);
  box-shadow: var(--shadow);
}
.field { margin-bottom: var(--space-2); }
.field:last-child { margin-bottom: 0; }
.field label { display: block; margin-bottom: var(--space-1); font-weight: 600; }

input[type="url"] {
  width: 100%;
  padding: 0.8rem var(--space-2);
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}
.help { margin: var(--space-1) 0 0; color: var(--color-muted); font-size: 1rem; }
.field-error { margin: var(--space-1) 0 0; color: var(--color-error); font-size: 1rem; }

.field--inline { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); flex-wrap: wrap; }
.checkbox { display: flex; align-items: center; gap: var(--space-1); font-weight: 400; margin: 0; cursor: pointer; }
.checkbox input { width: 1.125rem; height: 1.125rem; }

button[type="submit"], .btn {
  display: inline-block;
  min-height: 2.75rem;
  padding: 0.7rem var(--space-3);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-accent-contrast);
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-2));
  border: none;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
}
button[type="submit"]:hover, .btn:hover { filter: brightness(1.08); }
button[disabled] { opacity: 0.6; cursor: progress; }

/* ---- Status / results (used by app.js) ---- */
.status {
  margin-top: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}
.status--error { border-color: var(--color-error); background: var(--color-error-bg); }
.results { margin-top: var(--space-3); }

.summary {
  display: flex; flex-wrap: wrap; gap: var(--space-3);
  padding: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: var(--space-3);
}
.metric { display: flex; flex-direction: column; min-width: 6rem; }
.metric .num { font-size: 1.5rem; font-weight: 700; }
.metric .lbl { font-size: 1rem; color: var(--color-muted); }

.blocks { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: var(--space-2); }
.block {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-2) var(--space-3);
}
.block--valid { border-left-color: var(--color-ok); }
.block--invalid { border-left-color: var(--color-error); }
.block-head { display: flex; align-items: center; gap: var(--space-1); flex-wrap: wrap; }
.block-type { font-size: 1.125rem; font-weight: 700; }
.block-format { font-family: var(--mono); font-size: 1rem; color: var(--color-muted); }

.badge {
  display: inline-flex; align-items: center; gap: 0.25rem;
  padding: 0.125rem 0.625rem; border-radius: 999px;
  font-size: 1rem; font-weight: 600; border: 1px solid transparent;
}
.badge--ok { color: var(--color-ok); background: var(--color-ok-bg); border-color: var(--color-ok); }
.badge--error { color: var(--color-error); background: var(--color-error-bg); border-color: var(--color-error); }
.badge--warn { color: var(--color-warn); background: var(--color-warn-bg); border-color: var(--color-warn); }
.badge--info { color: var(--color-info); background: var(--color-info-bg); border-color: var(--color-info); }

.msg-list { margin: var(--space-2) 0 0; padding-left: 1.25rem; }
.msg-list li { margin-bottom: 0.25rem; }
.msg-list--error li { color: var(--color-error); }
.msg-list--warn li { color: var(--color-warn); }

.note {
  margin: var(--space-2) 0 0; padding: var(--space-1) var(--space-2);
  background: var(--color-info-bg); border-radius: var(--radius-sm);
  color: var(--color-text); font-size: 1rem;
}

details.raw { margin-top: var(--space-2); }
details.raw summary { cursor: pointer; color: var(--color-muted); }
details.raw pre {
  overflow-x: auto; background: var(--color-bg);
  border: 1px solid var(--color-border); border-radius: var(--radius-sm);
  padding: var(--space-2); font-family: var(--mono); font-size: 0.9375rem;
}

.spinner {
  display: inline-block; width: 1rem; height: 1rem; margin-right: var(--space-1);
  border: 2px solid var(--color-muted); border-top-color: var(--color-accent);
  border-radius: 50%; vertical-align: middle; animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spinner { animation: none; } }

/* ---- Cards / how / checks ---- */
.card-grid, .check-grid {
  display: grid; gap: var(--space-2);
  grid-template-columns: 1fr;
}
.card, .check-grid li {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-3);
}
.card p { margin: 0; color: var(--color-muted); }

.check-grid { list-style: none; margin: 0; padding: 0; }
.check-grid li { display: flex; gap: var(--space-2); align-items: flex-start; }
.check-grid .ico { font-size: 1.5rem; line-height: 1; }
.check-grid p { margin: 0; color: var(--color-muted); }

.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-2); grid-template-columns: 1fr; }
.steps li { display: flex; gap: var(--space-2); align-items: flex-start; background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: var(--space-3); }
.step-n {
  display: grid; place-items: center; flex: none;
  width: 2.25rem; height: 2.25rem; border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-2));
  color: #fff; font-weight: 700;
}
.steps p, .how p { margin: 0; color: var(--color-muted); }

/* ---- FAQ ---- */
.faq details {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-2) var(--space-3);
  margin-bottom: var(--space-2);
}
.faq summary { cursor: pointer; font-weight: 600; }
.faq details[open] summary { margin-bottom: var(--space-1); }
.faq p { margin: 0; color: var(--color-muted); }

/* ---- CTA ---- */
.cta { text-align: center; }
.cta p { color: var(--color-muted); margin: 0 0 var(--space-3); }

/* ---- Footer ---- */
.site-footer {
  padding: var(--space-4) 0;
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 1rem;
}
.footer-grid { display: flex; flex-direction: column; gap: var(--space-2); }
.footer-links { display: flex; gap: var(--space-3); flex-wrap: wrap; }
.footer-links a, .footer-by a { color: var(--color-accent); text-decoration: none; }
.footer-links a:hover, .footer-by a:hover { text-decoration: underline; }

/* ---- Responsive ---- */
@media (min-width: 48rem) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .check-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { flex-direction: row; align-items: center; justify-content: space-between; }
}
@media (min-width: 64rem) {
  .card-grid { grid-template-columns: repeat(4, 1fr); }
}