:root{
  --bg:#f6f8fc;
  --surface:#ffffff;
  --surface-soft:#f4f7fc;
  --surface-soft-2:#f8fbff;
  --text:#1f2937;
  --muted:#667085;
  --line:#dae3f1;
  --line-strong:#c7d5eb;
  --blue:#4f46e5;
  --blue-soft:#eef0ff;
  --blue-2:#7c3aed;
  --green:#0f9f75;
  --green-soft:#e8fbf4;
  --amber:#b7791f;
  --amber-soft:#fff6e5;
  --red:#d14343;
  --red-soft:#fff1f1;
  --shadow:0 24px 60px rgba(74, 93, 138, .10);
  --radius:24px;
  color-scheme:light;
  font-family:Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:linear-gradient(180deg,#f9fbff 0%, #f2f6fc 100%);color:var(--text)}
a{color:inherit}
button,select{font:inherit}
.container{width:min(1160px, calc(100% - 32px));margin:0 auto}
.topbar{position:sticky;top:0;z-index:10;background:rgba(246,248,252,.88);backdrop-filter:blur(12px);border-bottom:1px solid rgba(189,205,229,.7)}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:72px}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;text-decoration:none}
.brand-badge{display:grid;place-items:center;width:44px;height:32px;border-radius:12px;background:linear-gradient(135deg,var(--blue),var(--blue-2));color:#fff;font-size:12px;letter-spacing:.08em}
.nav{display:flex;gap:18px}
.nav a{text-decoration:none;color:var(--muted)}
.nav a:hover{color:var(--text)}
.hero{padding:64px 0 24px}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(300px,.88fr);gap:28px;align-items:stretch}
.card,.hero-copy,.hero-side{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.hero-copy{padding:36px}
.hero-side{padding:28px}
.eyebrow{margin:0 0 10px;color:var(--blue);font-size:12px;font-weight:800;letter-spacing:.16em;text-transform:uppercase}
h1,h2{margin:0;letter-spacing:-.04em}
h1{font-size:clamp(34px,5vw,58px);line-height:1.03}
h2{font-size:clamp(28px,4vw,38px)}
.hero-lead{margin:18px 0 0;color:#435067;font-size:18px;line-height:1.7}
.hero-bullets{display:flex;flex-wrap:wrap;gap:10px;margin:24px 0 0}
.hero-bullets span,.status-pill,.confidence-pill,.tech-chip{display:inline-flex;align-items:center;gap:8px;padding:10px 14px;border-radius:999px;border:1px solid var(--line-strong);background:var(--surface-soft);font-size:13px;font-weight:700}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}
.button{appearance:none;border:1px solid var(--line-strong);border-radius:14px;padding:13px 18px;cursor:pointer;font-weight:800;text-decoration:none;background:var(--surface);transition:transform .15s ease, box-shadow .15s ease}
.button-primary{background:linear-gradient(135deg,var(--blue),#6366f1);color:#fff;border-color:transparent}
.button-secondary{background:#fff;color:var(--text)}
.button:hover{transform:translateY(-1px);box-shadow:0 10px 24px rgba(79,70,229,.12)}
.status-card p{margin:14px 0 0;color:var(--muted);line-height:1.6}
.status-head{display:flex;flex-direction:column;gap:10px}
.mini-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:20px}
.mini-grid div,.info-box,.metrics-grid article,.subscores-grid article,.history-item,.quick-list div,.guide-grid > div,.levels-grid article,.result-explain article,.plain-facts article{padding:18px;border-radius:18px;border:1px solid var(--line);background:var(--surface-soft)}
.mini-grid span,.info-box span,.metrics-grid span,.history-item .label,.quick-list .label{display:block;color:var(--muted);font-size:12px;margin-bottom:8px}
.section{padding-bottom:72px}
.section-stack{display:grid;gap:18px}
.card{padding:22px}
.panel-heading{display:flex;justify-content:space-between;gap:20px;align-items:flex-start}
.panel-heading-compact{align-items:center}
.info-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:18px}
.info-box strong,.metrics-grid strong,.subscores-grid strong,.levels-grid strong{font-size:28px;line-height:1.05;letter-spacing:-.04em}
.note-box{margin-top:16px;padding:16px 18px;border-radius:16px;background:var(--amber-soft);border:1px solid #f1d39c;color:#74501e;line-height:1.6}
.plain-facts{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:16px}
.plain-facts strong,.guide-grid strong,.result-explain strong,.faq-columns summary{font-size:16px}
.plain-facts p,.result-explain p,.guide-grid p,.levels-grid p,.faq-columns p,.demo-text,.score-scale-note,.quick-warning,.check-list li{margin:8px 0 0;color:#4d5b71;line-height:1.7}
.hub-links{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.hub-links a{display:flex;align-items:center;justify-content:center;min-height:74px;padding:16px;border:1px solid var(--line);border-radius:18px;background:var(--surface-soft);text-decoration:none;font-weight:800;color:#334155}
.hub-links a:hover{border-color:#b7c8e7;background:#f8fbff}
.bench-grid{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:18px}
.bench-card{padding:24px}
.bench-head{display:flex;justify-content:space-between;gap:18px;align-items:flex-start}
.profile-picker{display:grid;gap:6px;color:var(--muted);font-size:13px}
select{padding:12px 14px;border-radius:14px;border:1px solid var(--line-strong);background:#fff;color:var(--text)}
.canvas-shell{position:relative;overflow:hidden;margin-top:18px;border-radius:24px;border:1px solid var(--line);background:#eef2ff;aspect-ratio:16/9}
canvas{display:block;width:100%;height:100%;background:#eff3ff}
.overlay-badge,.overlay-fps{position:absolute;top:16px;padding:10px 14px;border-radius:12px;background:#fff;border:1px solid rgba(215,224,241,.95);box-shadow:0 10px 20px rgba(120,136,173,.12);font-weight:800;font-size:14px}
.overlay-badge{left:16px;color:var(--blue)}
.overlay-fps{right:16px;color:var(--green)}
.progress-box{margin-top:16px}
.progress-track{height:10px;background:#edf2fa;border-radius:999px;overflow:hidden}
.progress-track span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--blue),#7c3aed);transition:width .18s ease}
.progress-line{display:flex;justify-content:space-between;gap:18px;margin-top:8px;font-size:13px}
.progress-line span{color:var(--muted)}
.button-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px}
.check-list{margin:16px 0 0;padding-left:18px;color:#4d5b71}
.check-list li+li{margin-top:8px}
.quick-card{height:max-content}
.quick-list{display:grid;gap:10px;margin-top:10px}
.quick-list strong{font-size:15px}
.quick-warning{margin-top:14px;padding:14px;border-radius:14px;background:var(--amber-soft);border:1px solid #f1d39c;color:#74501e;font-size:13px}
.result-card{padding:28px}
.result-head{display:flex;justify-content:space-between;gap:24px;align-items:flex-start}
.result-subtitle{margin:10px 0 0;color:var(--muted);line-height:1.5}
.score-block{text-align:center;min-width:270px}
.score-block strong,.demo-score{display:block;font-size:74px;line-height:.9;letter-spacing:-.06em;color:#4c56e8}
.score-block span{display:block;margin-top:8px;color:var(--muted)}
.rating-pill{margin-top:18px;display:inline-flex;padding:11px 18px;border-radius:999px;background:#e6f4ff;color:#2563eb;border:1px solid #bfdcff;font-weight:800}
.rating-invalid{background:var(--red-soft)!important;border-color:#f0b4b4!important;color:var(--red)!important}
.score-scale-note{margin:14px 0 0;padding:14px 16px;border-radius:16px;background:#f8faff;border:1px solid var(--line);color:#526077;font-size:13px;line-height:1.65}
.score-scale-note strong{color:var(--text)}
.subscores-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:20px}
.metrics-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:12px}
.quality-summary{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}
.result-explain{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:16px}
.stress-card{margin-top:16px;padding:16px;border-radius:18px;background:var(--surface-soft);border:1px solid var(--line)}
.stress-head{display:flex;justify-content:space-between;gap:16px;align-items:center;margin-bottom:12px}
.stress-graph{width:100%;height:180px;background:#fff;border-radius:16px;border:1px solid var(--line)}
.stress-graph path{fill:none;stroke:#4f46e5;stroke-width:3}
.history-empty{color:var(--muted);padding-top:8px}
.history-list{display:grid;gap:10px;margin-top:10px}
.history-item{display:grid;grid-template-columns:1.4fr repeat(4,.8fr);gap:12px;align-items:center}
.history-item strong{display:block;font-size:18px}
.link-button{background:none;border:0;color:#6366f1;cursor:pointer;text-decoration:underline}
.demo-result{display:grid;grid-template-columns:180px 1fr;gap:18px;align-items:center}
.guides-section{display:grid;gap:18px}
.guide-card{padding:24px}
.guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:14px}
.levels-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin-top:14px}
.faq-card{padding:24px}
.faq-columns{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:14px}
.faq-columns details{padding:18px;border-radius:18px;border:1px solid var(--line);background:var(--surface-soft-2)}
.faq-columns summary{cursor:pointer;list-style:none}
.faq-columns summary::-webkit-details-marker{display:none}
.faq-columns details[open]{border-color:#c9d7ef;background:#fbfdff}
.footer{padding:28px 0 40px}
.footer-inner{display:flex;justify-content:space-between;gap:20px;align-items:center;color:var(--muted)}
.footer-inner div{display:grid;gap:4px}
.footer strong{color:var(--text)}
.confidence-loading{color:var(--muted)}
.confidence-high,.quality-high{background:var(--green-soft)!important;border-color:#a9e5cd!important;color:var(--green)!important}
.confidence-medium,.quality-medium{background:var(--amber-soft)!important;border-color:#f1d39c!important;color:var(--amber)!important}
.confidence-low,.quality-low{background:var(--red-soft)!important;border-color:#f0b4b4!important;color:var(--red)!important}
@media (max-width:1100px){
  .bench-grid,.hero-grid{grid-template-columns:1fr}
  .hub-links,.levels-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:860px){
  .info-grid,.subscores-grid,.metrics-grid,.mini-grid,.plain-facts,.result-explain,.guide-grid,.levels-grid,.faq-columns{grid-template-columns:1fr}
  .result-head,.bench-head,.panel-heading,.demo-result{grid-template-columns:1fr;display:grid}
  .score-block{text-align:left}
  .history-item{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  .nav{display:none}
  .hub-links{grid-template-columns:1fr}
  .footer-inner{flex-direction:column;align-items:flex-start}
}


/* Rendering-audit additions */
.canvas-text-equivalent{
  margin:14px 2px 0;
  color:#526077;
  font-size:13px;
  line-height:1.65;
}
.canvas-text-equivalent strong{color:var(--text)}
.demo-result-full{padding-top:4px}
.demo-score-wrap span{display:block;margin-top:7px;color:var(--muted);font-size:13px}
.demo-metrics{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:12px;
  margin-top:16px;
}
.demo-metrics article{
  padding:16px;
  border-radius:16px;
  border:1px solid var(--line);
  background:var(--surface-soft);
}
.demo-metrics strong{display:block;font-size:25px;letter-spacing:-.03em}
.demo-metrics span{display:block;margin-top:4px;color:var(--muted);font-size:12px}
.demo-note{margin:14px 0 0;color:#526077;line-height:1.65;font-size:13px}
.noscript-panel{
  margin:0 0 28px;
}
.noscript-panel .container{
  padding:18px 20px;
  border:1px solid #f1d39c;
  border-radius:18px;
  background:var(--amber-soft);
  color:#68491c;
}
.noscript-panel p{margin:7px 0;line-height:1.6}
.noscript-panel a{font-weight:800}
.no-js #supportPill{background:var(--amber-soft);border-color:#f1d39c;color:var(--amber)}
@media (max-width:860px){
  .demo-metrics{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:520px){
  .demo-metrics{grid-template-columns:1fr}
}


/* Performance orientation — user-facing score context */
.performance-orientation{
  margin-top:14px;
  padding:18px;
  border:1px solid var(--line);
  border-radius:20px;
  background:linear-gradient(180deg,#fbfcff 0%,#f4f7ff 100%);
}
.performance-orientation-head{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:22px;
}
.performance-orientation-head > div:first-child{
  display:grid;
  gap:5px;
}
.performance-kicker{
  color:var(--muted);
  font-size:12px;
  font-weight:700;
  text-transform:uppercase;
  letter-spacing:.08em;
}
.performance-orientation-head strong{
  font-size:22px;
  letter-spacing:-.025em;
}
#performanceLevel,
.performance-orientation-demo .performance-orientation-head > div:first-child > span:last-child{
  color:#4f5e75;
  font-size:14px;
  font-weight:700;
}
.performance-reference{
  min-width:150px;
  text-align:right;
}
.performance-reference strong{
  display:block;
  color:var(--blue);
  font-size:30px;
  line-height:1;
}
.performance-reference span{
  display:block;
  margin-top:5px;
  color:var(--muted);
  font-size:12px;
}
.performance-scale{
  margin-top:16px;
}
.performance-scale-track{
  position:relative;
  height:12px;
  overflow:hidden;
  border:1px solid #d3dded;
  border-radius:999px;
  background:
    linear-gradient(90deg,
      #eef2f8 0%,
      #eef2f8 18%,
      #e9eefb 18%,
      #e9eefb 30%,
      #e4e9ff 30%,
      #e4e9ff 50%,
      #e0e5ff 50%,
      #e0e5ff 70%,
      #dce1ff 70%,
      #dce1ff 90%,
      #d7ddff 90%,
      #d7ddff 100%);
}
.performance-scale-track > span{
  display:block;
  width:0;
  height:100%;
  border-radius:999px;
  background:linear-gradient(90deg,#4f46e5,#7c3aed);
  transition:width .45s ease;
}
.performance-scale-labels{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:8px;
  margin-top:7px;
  color:var(--muted);
  font-size:11px;
}
.performance-scale-labels span:nth-child(2),
.performance-scale-labels span:nth-child(3){text-align:center}
.performance-scale-labels span:last-child{text-align:right}
.performance-next{
  margin:12px 0 0;
  color:#394960;
  font-size:13px;
  line-height:1.55;
  font-weight:700;
}
.performance-orientation-invalid{
  background:var(--red-soft);
  border-color:#f0b4b4;
}
.performance-orientation-demo{
  margin-top:16px;
  box-shadow:none;
}
@media (max-width:640px){
  .performance-orientation-head{
    display:grid;
    grid-template-columns:1fr;
  }
  .performance-reference{
    text-align:left;
  }
  .performance-scale-labels{
    font-size:10px;
  }
}