/* ---- Tokens ------------------------------------------------------- */
:root {
  --paper: #f6f8fb;
  --surface: #ffffff;
  --code-bg: #eef1f6;
  --line: #dde3ec;

  --ink: #10131a;
  --ink-soft: #4b5468;

  --signal: #3654ff;
  --signal-strong: #2540d9;
  --signal-tint: #eaeeff;

  --critical: #c0273c;
  --critical-tint: #fdebee;
  --serious: #b4530a;
  --serious-tint: #fdf1e6;
  --moderate: #7a5d00;
  --moderate-tint: #fbf6dc;
  --minor: #3b4252;
  --minor-tint: #eef0f4;
  --pass: #0f7a5c;
  --pass-tint: #e6f5f0;

  --font-display: "Space Grotesk", "Segoe UI", sans-serif;
  --font-body: "IBM Plex Sans", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

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

/* ---- Focus (this is also the brand signature — see .ring-mark) ---- */

:focus {
  outline: none;
}

:focus-visible {
  outline: 3px solid var(--signal);
  outline-offset: 3px;
  box-shadow: 0 0 0 6px var(--signal-tint);
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--signal);
  color: #fff;
  padding: 0.75rem 1.25rem;
  z-index: 100;
  border-radius: 0 0 8px 0;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.skip-link:focus-visible {
  left: 0;
}

/* ---- Header --------------------------------------------------------- */

.site-header {
  padding: 1.5rem 0;
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--ink);
}

.ring-mark {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow:
    0 0 0 3px var(--paper),
    0 0 0 5px var(--signal);
  flex-shrink: 0;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.header-meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
}

/* ---- Hero ------------------------------------------------------------ */

.hero {
  padding: 3.5rem 1.5rem 3rem;
}

.reveal {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--signal);
  margin: 0 0 0.9rem;
}

h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.1rem, 5vw, 3.1rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
  max-width: 14ch;
}

.lede {
  font-size: 1.05rem;
  color: var(--ink-soft);
  max-width: 46ch;
  margin: 0 0 2.25rem;
}

/* ---- Command bar ------------------------------------------------------ */

.command-bar {
  display: flex;
  align-items: stretch;
  background: var(--surface);
  border: 1.5px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.command-bar:focus-within {
  border-color: var(--signal);
  box-shadow: 0 0 0 5px var(--signal-tint);
}

.command-prefix {
  display: flex;
  align-items: center;
  padding-left: 1.1rem;
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--signal);
}

#url-input {
  flex: 1 1 auto;
  min-width: 0;
  border: none;
  background: transparent;
  padding: 1.05rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--ink);
}

#url-input::placeholder {
  color: #9aa3b5;
}

#submit-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0 1.6rem;
  border: none;
  background: var(--signal);
  color: #fff;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.92rem;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

#submit-btn:hover:not(:disabled) {
  background: var(--signal-strong);
}

#submit-btn:disabled {
  background: var(--ink-soft);
  cursor: not-allowed;
}

.btn-ring {
  display: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: #fff;
}

#submit-btn[aria-busy="true"] .btn-ring {
  display: inline-block;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.help-text {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin: 0.65rem 0 0;
}

.status-line {
  min-height: 1.4rem;
  margin: 1rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.status-line[data-state="error"] {
  color: var(--critical);
}

/* ---- Results ----------------------------------------------------------- */

.results {
  padding: 0 1.5rem 4rem;
}

.results-head {
  border-top: 1px solid var(--line);
  padding-top: 2rem;
  margin-bottom: 2rem;
}

.score-row {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 0.75rem;
}

.score-ring {
  --pct: 0;
  --ring-color: var(--pass);
  position: relative;
  width: 92px;
  height: 92px;
  border-radius: 50%;
  background: conic-gradient(var(--ring-color) calc(var(--pct) * 1%), var(--line) 0);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.score-ring::before {
  content: "";
  position: absolute;
  inset: 9px;
  border-radius: 50%;
  background: var(--paper);
}

.score-number {
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 1.4rem;
  color: var(--ink);
}

.score-summary {
  margin: 0 0 0.5rem;
  font-size: 0.98rem;
}

.disclaimer {
  margin: 0;
  font-size: 0.82rem;
  color: var(--ink-soft);
  max-width: 52ch;
}

.violations-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.violation-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.1rem 1.25rem 1.1rem 1.5rem;
  --impact-color: var(--minor);
}

.violation-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  border-radius: 12px 0 0 12px;
  background: var(--impact-color);
}

.impact-critical {
  --impact-color: var(--critical);
}
.impact-serious {
  --impact-color: var(--serious);
}
.impact-moderate {
  --impact-color: var(--moderate);
}
.impact-minor {
  --impact-color: var(--minor);
}

.impact-chip {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  border: 1px solid var(--impact-color);
  color: var(--impact-color);
  background: var(--impact-tint, transparent);
  margin-bottom: 0.55rem;
}

.impact-critical .impact-chip {
  --impact-tint: var(--critical-tint);
}
.impact-serious .impact-chip {
  --impact-tint: var(--serious-tint);
}
.impact-moderate .impact-chip {
  --impact-tint: var(--moderate-tint);
}
.impact-minor .impact-chip {
  --impact-tint: var(--minor-tint);
}

.violation-card h3 {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.3rem;
}

.violation-card p {
  margin: 0 0 0.3rem;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.wcag-tags {
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.node-list {
  list-style: none;
  margin: 0.75rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.node-list li {
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.55rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  overflow-x: auto;
}

.node-list .selector {
  display: block;
  color: var(--signal-strong);
  margin-bottom: 0.2rem;
}

.node-list .html {
  display: block;
  color: var(--ink-soft);
  white-space: pre-wrap;
  word-break: break-word;
}

/* ---- Footer ------------------------------------------------------------ */

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.75rem 0 2.5rem;
}

.footer-row p {
  margin: 0.2rem 0;
  font-size: 0.82rem;
  color: var(--ink-soft);
}

.footer-row .quiet {
  font-family: var(--font-mono);
  font-size: 0.76rem;
}

/* ---- Motion & small screens -------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  .reveal,
  .reveal.is-visible {
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
  .btn-ring {
    animation: none !important;
  }
}

@media (max-width: 480px) {
  .command-bar {
    flex-wrap: wrap;
    border-radius: 12px;
  }
  #url-input {
    width: 100%;
    order: 1;
  }
  .command-prefix {
    order: 0;
  }
  #submit-btn {
    order: 2;
    width: 100%;
    padding: 0.9rem;
    justify-content: center;
  }
}