/* ==========================================================================
   SiteGrade AI — Homepage Styles
   Design system: "diagnostic scorecard" — ink-navy + paper surfaces,
   amber/teal/coral used as literal audit status colors.
   ========================================================================== */

:root {
  /* Color tokens */
  --ink: #101b2d;
  --ink-soft: #17263d;
  --ink-line: #2a3b56;
  --paper: #eceff4;
  --paper-dim: #cdd4e0;
  --paper-line: #b7c0d1;
  --text-on-ink: #eef1f6;
  --text-on-ink-muted: #9fb0c9;
  --text-on-paper: #101b2d;
  --text-muted: #55647d;

  --signal-amber: #f2a93b;
  --signal-amber-ink: #7a530f;
  --pass-teal: #2fb6a3;
  --pass-teal-ink: #0f4d44;
  --fail-coral: #e8604a;
  --fail-coral-ink: #6e2013;

  /* Type */
  --font-display: "Space Grotesk", "Arial Narrow", sans-serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  /* Layout */
  --max-width: 1180px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --gap: clamp(1rem, 2vw, 1.75rem);
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}
body {
  margin: 0;
  background: var(--ink);
  color: var(--text-on-ink);
  font-family: var(--font-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.1;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}
p { margin: 0 0 1em; }
ul { margin: 0; padding: 0; list-style: none; }
button { font-family: inherit; cursor: pointer; }
code, .mono { font-family: var(--font-mono); }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 2.5rem);
}

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

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--signal-amber);
  margin-bottom: 0.9em;
}
.eyebrow::before {
  content: "";
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--signal-amber);
  box-shadow: 0 0 0 3px rgba(242, 169, 59, 0.2);
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.98rem;
  padding: 0.85em 1.5em;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  white-space: nowrap;
}
.btn:focus-visible {
  outline: 3px solid var(--signal-amber);
  outline-offset: 2px;
}
.btn-primary {
  background: var(--signal-amber);
  color: #1a1204;
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(242,169,59,0.28); }
.btn-ghost {
  background: transparent;
  border-color: var(--ink-line);
  color: var(--text-on-ink);
}
.btn-ghost:hover { border-color: var(--signal-amber); color: var(--signal-amber); }
.btn-block { width: 100%; }

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(16, 27, 45, 0.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--ink-line);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.6em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  text-decoration: none;
  color: var(--text-on-ink);
}
.logo-mark {
  width: 30px; height: 30px;
  border-radius: 7px;
  background: linear-gradient(160deg, var(--signal-amber), var(--pass-teal));
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.8rem;
  color: #10240f;
}
.main-nav ul {
  display: flex;
  gap: 2rem;
  align-items: center;
}
.main-nav a {
  text-decoration: none;
  font-size: 0.95rem;
  color: var(--text-on-ink-muted);
  transition: color 0.15s ease;
}
.main-nav a:hover { color: var(--text-on-ink); }
.header-cta { display: flex; align-items: center; gap: 1rem; }
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--ink-line);
  border-radius: var(--radius-sm);
  padding: 0.5em 0.7em;
  color: var(--text-on-ink);
}
.nav-toggle svg { width: 20px; height: 20px; }

.mobile-nav {
  display: none;
  border-bottom: 1px solid var(--ink-line);
  background: var(--ink);
}
.mobile-nav[hidden] { display: none; }
.mobile-nav ul { display: flex; flex-direction: column; padding: 1rem 0; gap: 0.25rem; }
.mobile-nav a {
  display: block;
  padding: 0.65rem 0;
  text-decoration: none;
  color: var(--text-on-ink-muted);
  font-size: 1rem;
}
.mobile-nav a:hover { color: var(--text-on-ink); }
@media (max-width: 840px) {
  .mobile-nav:not([hidden]) { display: block; }
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  padding: clamp(3rem, 8vw, 6rem) 0 clamp(2.5rem, 6vw, 4rem);
  background:
    radial-gradient(60% 55% at 85% 10%, rgba(47,182,163,0.14), transparent 60%),
    radial-gradient(50% 50% at 10% 90%, rgba(242,169,59,0.12), transparent 60%);
}
.hero .container {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.hero h1 {
  font-size: clamp(2.1rem, 4.4vw, 3.4rem);
  color: #ffffff;
}
.hero h1 .accent { color: var(--signal-amber); }
.hero-lead {
  font-size: 1.1rem;
  color: var(--text-on-ink-muted);
  max-width: 46ch;
}
.scan-form {
  display: flex;
  gap: 0.6rem;
  background: var(--ink-soft);
  border: 1px solid var(--ink-line);
  padding: 0.5rem;
  border-radius: var(--radius-md);
  margin: 1.75rem 0 0.85rem;
}
.scan-form input[type="url"] {
  flex: 1;
  min-width: 0;
  background: transparent;
  border: none;
  color: var(--text-on-ink);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  padding: 0.7em 0.8em;
}
.scan-form input[type="url"]:focus { outline: none; }
.scan-form input[type="url"]::placeholder { color: var(--text-on-ink-muted); }
.form-note {
  font-size: 0.82rem;
  color: var(--text-on-ink-muted);
  font-family: var(--font-mono);
}
.form-note strong { color: var(--pass-teal); }

.crawler-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.75rem;
}
.crawler-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 0.4em 0.75em;
  border-radius: 999px;
  border: 1px solid var(--ink-line);
  color: var(--text-on-ink-muted);
}
.crawler-chip .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--pass-teal);
}

/* ---- Hero scorecard mockup ---- */
.scorecard {
  background: var(--paper);
  color: var(--text-on-paper);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 30px 70px -20px rgba(0,0,0,0.55);
  position: relative;
  border: 1px solid rgba(255,255,255,0.08);
}
.scorecard-bar {
  display: flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.7em 1em;
  background: var(--paper-dim);
  border-bottom: 1px solid var(--paper-line);
}
.scorecard-bar span {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--paper-line);
}
.scorecard-bar .url {
  margin-left: 0.6em;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}
.scorecard-body {
  position: relative;
  padding: 1.5rem;
  overflow: hidden;
}
.scan-line {
  position: absolute;
  left: 0; right: 0; top: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--signal-amber), transparent);
  animation: sweep 3.2s ease-in-out infinite;
  opacity: 0.9;
}
@keyframes sweep {
  0% { transform: translateY(0); opacity: 0; }
  8% { opacity: 1; }
  92% { opacity: 1; }
  100% { transform: translateY(320px); opacity: 0; }
}
.grade-row {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 1.1rem;
}
.grade-letter {
  font-family: var(--font-display);
  font-size: 3.4rem;
  font-weight: 700;
  color: var(--pass-teal-ink);
}
.grade-meta { font-size: 0.85rem; color: var(--text-muted); }
.grade-meta strong { display: block; color: var(--text-on-paper); font-size: 1rem; }

.meter { margin-bottom: 0.65rem; }
.meter-label {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-muted);
  margin-bottom: 0.25em;
}
.meter-track {
  height: 7px;
  border-radius: 999px;
  background: var(--paper-line);
  overflow: hidden;
}
.meter-fill {
  height: 100%;
  border-radius: 999px;
  background: var(--pass-teal);
}
.meter-fill.warn { background: var(--signal-amber); }
.meter-fill.fail { background: var(--fail-coral); }

.crawler-check-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem 1rem;
  margin-top: 1.1rem;
  padding-top: 1.1rem;
  border-top: 1px dashed var(--paper-line);
}
.crawler-check {
  display: flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-muted);
}
.crawler-check .status {
  width: 16px; height: 16px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 0.62rem;
  color: #fff;
  flex-shrink: 0;
}
.crawler-check .status.ok { background: var(--pass-teal); }
.crawler-check .status.blocked { background: var(--fail-coral); }

/* ==========================================================================
   Section scaffolding
   ========================================================================== */
section { padding: clamp(3rem, 7vw, 5.5rem) 0; }
.section-head {
  max-width: 62ch;
  margin-bottom: clamp(2rem, 5vw, 3rem);
}
.section-head h2 {
  font-size: clamp(1.7rem, 3.4vw, 2.4rem);
  color: #ffffff;
}
.on-paper .section-head h2,
.on-paper h3 { color: var(--text-on-paper); }
.section-head p { color: var(--text-on-ink-muted); font-size: 1.05rem; }
.on-paper .section-head p { color: var(--text-muted); }

.on-paper {
  background: var(--paper);
  color: var(--text-on-paper);
}

/* ==========================================================================
   Audit grid (What we check)
   ========================================================================== */
.audit-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
}
.audit-card {
  background: var(--ink-soft);
  border: 1px solid var(--ink-line);
  border-radius: var(--radius-md);
  padding: 1.6rem;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.audit-card:hover { border-color: var(--signal-amber); transform: translateY(-3px); }
.audit-card .icon {
  width: 40px; height: 40px;
  border-radius: 9px;
  display: grid;
  place-items: center;
  margin-bottom: 1rem;
  background: rgba(242,169,59,0.14);
  color: var(--signal-amber);
}
.audit-card .icon svg { width: 20px; height: 20px; }
.audit-card h3 { font-size: 1.08rem; color: #fff; margin-bottom: 0.4em; }
.audit-card p { color: var(--text-on-ink-muted); font-size: 0.95rem; margin: 0; }
.audit-card .tag-row { display: flex; flex-wrap: wrap; gap: 0.4em; margin-top: 0.9em; }
.audit-card .tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 0.25em 0.55em;
  border-radius: 999px;
  border: 1px solid var(--ink-line);
  color: var(--text-on-ink-muted);
}

/* ==========================================================================
   How it works
   ========================================================================== */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
  counter-reset: step;
}
.step { position: relative; padding-left: 0.2rem; }
.step-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--signal-amber);
  display: block;
  margin-bottom: 0.6em;
}
.step h3 { color: #fff; font-size: 1.15rem; }
.step p { color: var(--text-on-ink-muted); }

/* ==========================================================================
   Score breakdown (full model list)
   ========================================================================== */
.model-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem 2rem;
}
.model-row {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.model-row .label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.92rem;
}
.model-row .label .full { color: var(--text-muted); font-size: 0.78rem; }
.model-row .label strong { font-family: var(--font-mono); font-size: 0.9rem; }

/* ==========================================================================
   Testimonial / proof strip
   ========================================================================== */
.proof-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap);
  text-align: center;
}
.proof-stat .num {
  font-family: var(--font-display);
  font-size: 2.1rem;
  color: var(--signal-amber);
  display: block;
}
.proof-stat .label {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-on-ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq-list { max-width: 800px; }
.faq-item {
  border-bottom: 1px solid var(--paper-line);
}
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: none;
  border: none;
  text-align: left;
  padding: 1.25rem 0;
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--text-on-paper);
}
.faq-question .chev {
  flex-shrink: 0;
  width: 22px; height: 22px;
  transition: transform 0.2s ease;
}
.faq-item[data-open="true"] .chev { transform: rotate(45deg); }
.faq-question:focus-visible { outline: 3px solid var(--signal-amber); outline-offset: 3px; }
.faq-answer {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.25s ease;
}
.faq-answer p {
  padding-bottom: 1.25rem;
  color: var(--text-muted);
  max-width: 65ch;
}

/* ==========================================================================
   CTA banner
   ========================================================================== */
.cta-banner {
  background: linear-gradient(135deg, var(--ink-soft), var(--ink));
  border: 1px solid var(--ink-line);
  border-radius: var(--radius-lg);
  padding: clamp(2.2rem, 5vw, 3.5rem);
  text-align: center;
}
.cta-banner h2 { color: #fff; font-size: clamp(1.6rem, 3.4vw, 2.2rem); }
.cta-banner p { color: var(--text-on-ink-muted); margin-bottom: 1.6rem; }
.cta-actions { display: flex; justify-content: center; gap: 1rem; flex-wrap: wrap; }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--ink-soft);
  border-top: 1px solid var(--ink-line);
  padding: 3rem 0 1.5rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: var(--gap);
  margin-bottom: 2.5rem;
}
.footer-brand p { color: var(--text-on-ink-muted); max-width: 34ch; font-size: 0.92rem; }
.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-on-ink-muted);
  margin-bottom: 0.9em;
}
.footer-col ul li { margin-bottom: 0.55em; }
.footer-col a {
  text-decoration: none;
  color: var(--text-on-ink-muted);
  font-size: 0.92rem;
}
.footer-col a:hover { color: var(--text-on-ink); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--ink-line);
  font-size: 0.82rem;
  color: var(--text-on-ink-muted);
}
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-on-ink-muted);
}
.breadcrumb a { text-decoration: none; color: var(--text-on-ink-muted); }
.breadcrumb a:hover { color: var(--signal-amber); }
.breadcrumb .sep { margin: 0 0.4em; opacity: 0.5; }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 980px) {
  .audit-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; gap: 2rem; }
  .proof-strip { grid-template-columns: repeat(2, 1fr); gap: 1.75rem; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 840px) {
  .hero .container { grid-template-columns: 1fr; }
  .scorecard { order: -1; }
  .main-nav { display: none; }
  .nav-toggle { display: inline-flex; }
}
@media (max-width: 600px) {
  .audit-grid { grid-template-columns: 1fr; }
  .scan-form { flex-direction: column; }
  .scan-form .btn { width: 100%; }
  .crawler-check-list { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .breadcrumb { display: none; }
}