/* Complex QA - Bug Tracker landing
   Brand locks: teal #009688 is the only accent, border-radius 0 everywhere. */

:root{
  --teal-500:#009688;
  --teal-600:#00796b;
  --teal-700:#00695c;
  --teal-50:#e0f2f1;
  --ink:#0f1513;
  --ink-2:#2c3936;
  --muted:#5b6b67;
  --line:#e2e7e5;
  --line-strong:#c7d0cd;
  --surface:#ffffff;
  --bg:#f5f7f6;
  --bg-2:#eef2f1;
  --sans:"Roboto",system-ui,-apple-system,"Segoe UI",Arial,sans-serif;
  --mono:ui-monospace,"SFMono-Regular","Roboto Mono",Menlo,Consolas,monospace;
  --wrap:1120px;
}

*{box-sizing:border-box;border-radius:0}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

body{
  margin:0;
  font-family:var(--sans);
  color:var(--ink);
  background:var(--bg);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

img{max-width:100%;display:block}
a{color:inherit}
h1,h2,h3,h4{margin:0;line-height:1.1;letter-spacing:-0.02em;font-weight:700}
p{margin:0}
.mono{font-family:var(--mono)}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}

.skip{
  position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;
  padding:.6rem 1rem;z-index:100;
}
.skip:focus{left:8px;top:8px}

:focus-visible{outline:2px solid var(--teal-500);outline-offset:2px}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.85rem 1.5rem;font:inherit;font-weight:500;font-size:.98rem;
  text-decoration:none;border:1px solid transparent;cursor:pointer;
  transition:background .15s ease,border-color .15s ease,color .15s ease;
}
.btn--sm{padding:.6rem 1.1rem;font-size:.9rem}
.btn--primary{background:var(--teal-500);color:#fff}
.btn--primary:hover{background:var(--teal-600)}
.btn--ghost{background:transparent;color:var(--ink);border-color:var(--line-strong)}
.btn--ghost:hover{border-color:var(--teal-500);color:var(--teal-700)}
.btn--invert{background:#fff;color:var(--teal-700)}
.btn--invert:hover{background:var(--teal-50)}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.9);
  -webkit-backdrop-filter:saturate(140%) blur(8px);
  backdrop-filter:saturate(140%) blur(8px);
  border-bottom:1px solid var(--line);
}
.header-row{display:flex;align-items:center;gap:24px;height:64px}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;font-weight:700}
.brand__mark{width:18px;height:18px;background:var(--teal-500);display:block}
.brand__name{font-size:1.05rem;letter-spacing:-0.01em;color:var(--ink)}
.brand__q{color:var(--teal-600)}

.nav{display:flex;gap:26px;margin-left:12px}
.nav a{text-decoration:none;color:var(--ink-2);font-size:.95rem;font-weight:500;padding:4px 0;border-bottom:2px solid transparent}
.nav a:hover{color:var(--ink);border-bottom-color:var(--teal-500)}

.header-actions{display:flex;align-items:center;gap:16px;margin-left:auto}
.link-login{text-decoration:none;color:var(--ink-2);font-weight:500;font-size:.95rem}
.link-login:hover{color:var(--teal-700)}

.burger{display:none;flex-direction:column;gap:4px;width:40px;height:40px;
  align-items:center;justify-content:center;background:none;border:1px solid var(--line-strong);margin-left:auto;cursor:pointer}
.burger span{width:18px;height:2px;background:var(--ink);display:block;transition:transform .2s,opacity .2s}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.mobile-nav{display:flex;flex-direction:column;gap:2px;padding:12px 24px 20px;border-bottom:1px solid var(--line);background:#fff}
.mobile-nav[hidden]{display:none}
.mobile-nav a{text-decoration:none;color:var(--ink-2);padding:10px 0;font-weight:500;border-bottom:1px solid var(--line)}
.mobile-nav a:last-child{border-bottom:none;margin-top:10px;justify-content:center}

/* ---------- Hero ---------- */
.hero{padding:72px 0 64px;background:
  linear-gradient(180deg,#fff 0%,var(--bg) 100%);
  border-bottom:1px solid var(--line)}
.hero-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:56px;align-items:center}
.eyebrow{
  font-family:var(--mono);text-transform:uppercase;letter-spacing:.16em;
  font-size:.78rem;color:var(--teal-700);margin-bottom:18px;font-weight:500;
}
.hero h1{font-size:clamp(2.3rem,5.2vw,3.6rem);font-weight:900;color:var(--ink)}
.lede{margin-top:20px;font-size:1.12rem;color:var(--muted);max-width:38ch}
.cta-row{display:flex;gap:14px;margin-top:30px;flex-wrap:wrap}
.hero-facts{list-style:none;padding:0;margin:34px 0 0;display:flex;gap:22px;flex-wrap:wrap}
.hero-facts li{position:relative;padding-left:18px;color:var(--ink-2);font-size:.92rem;font-weight:500}
.hero-facts li::before{content:"";position:absolute;left:0;top:.55em;width:8px;height:8px;background:var(--teal-500)}

/* ---------- Window / table mock ---------- */
.window{background:var(--surface);border:1px solid var(--line-strong);box-shadow:0 24px 60px -32px rgba(15,21,19,.35)}
.window__bar{display:flex;align-items:center;gap:12px;padding:12px 16px;border-bottom:1px solid var(--line);background:var(--bg-2)}
.window__dots{display:inline-flex;gap:6px}
.window__dots i{width:9px;height:9px;background:var(--line-strong);display:block}
.window__title{font-family:var(--mono);font-size:.8rem;color:var(--muted)}

.table{display:flex;flex-direction:column;font-size:.86rem}
.table__head,.table__row{display:grid;grid-template-columns:64px 1fr 96px 96px;gap:14px;align-items:center;padding:12px 16px}
.table--wide .table__head,.table--wide .table__row{grid-template-columns:64px 1fr 96px 60px 108px}
.table__head{background:#fff;border-bottom:1px solid var(--line);color:var(--muted);text-transform:uppercase;letter-spacing:.06em;font-size:.72rem;font-weight:500}
.table__row{border-bottom:1px solid var(--line)}
.table__row:last-child{border-bottom:none}
.table__row:hover{background:var(--teal-50)}
.table__empty{padding:24px 16px;color:var(--muted);text-align:center;font-size:.9rem}

.tag{display:inline-block;font-size:.74rem;font-weight:500;padding:.18rem .5rem;border:1px solid var(--line-strong);white-space:nowrap}
.tag--open{background:var(--teal-500);color:#fff;border-color:var(--teal-500)}
.tag--prog{color:var(--teal-700);border-color:var(--teal-500);background:var(--teal-50)}
.tag--done{color:var(--muted)}

/* severity meter - the signature element */
.sev{display:inline-flex;gap:3px}
.sev i{width:8px;height:8px;background:var(--line-strong);display:block}
.sev i.on{background:var(--teal-500)}

/* ---------- Sections ---------- */
.section{padding:80px 0}
.section--alt{background:var(--bg-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{max-width:56ch;margin-bottom:40px}
.section-head h2{font-size:clamp(1.7rem,3.4vw,2.4rem);color:var(--ink)}
.section-head p{margin-top:14px;color:var(--muted);font-size:1.05rem}

/* ---------- Cards ---------- */
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--line-strong);background:var(--line-strong);
  gap:1px}
.card{background:var(--surface);padding:28px 24px 30px;transition:background .15s ease}
.card:hover{background:var(--teal-50)}
.card__idx{display:block;color:var(--teal-600);font-size:.8rem;margin-bottom:16px;font-weight:500}
.card h3{font-size:1.1rem;color:var(--ink);margin-bottom:10px}
.card p{color:var(--muted);font-size:.94rem}

/* ---------- Panel (interactive) ---------- */
.filters{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:20px}
.chip{
  font:inherit;font-size:.9rem;font-weight:500;padding:.5rem 1rem;
  background:#fff;border:1px solid var(--line-strong);color:var(--ink-2);cursor:pointer;
  transition:all .15s ease;
}
.chip:hover{border-color:var(--teal-500);color:var(--teal-700)}
.chip.is-active{background:var(--teal-500);border-color:var(--teal-500);color:#fff}
.panel__count{margin-top:16px;color:var(--muted);font-size:.86rem;font-family:var(--mono)}

/* ---------- Chain ---------- */
.chain{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:0;border:1px solid var(--line-strong)}
.chain__step{
  flex:1 1 0;min-width:150px;background:#fff;padding:26px 22px;font-weight:700;font-size:1.05rem;color:var(--ink);
  position:relative;border-right:1px solid var(--line-strong);display:flex;flex-direction:column;gap:10px;
}
.chain__step:last-child{border-right:none}
.chain__step--end{background:var(--teal-500);color:#fff}
.chain__k{font-size:.78rem;font-weight:500;color:var(--teal-600)}
.chain__step--end .chain__k{color:rgba(255,255,255,.75)}

/* ---------- CTA band ---------- */
.cta-band{background:var(--teal-700);color:#fff;padding:72px 0}
.cta-band__inner{text-align:center;max-width:640px}
.cta-band h2{font-size:clamp(1.8rem,3.6vw,2.5rem)}
.cta-band p{margin:16px 0 30px;color:rgba(255,255,255,.85);font-size:1.08rem}

/* ---------- Footer ---------- */
.site-footer{background:#fff;border-top:1px solid var(--line);padding:56px 0 28px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px}
.footer-note{margin-top:14px;color:var(--muted);font-size:.9rem;max-width:34ch}
.footer-col h4{font-size:.82rem;text-transform:uppercase;letter-spacing:.08em;color:var(--ink);margin-bottom:14px;font-weight:700}
.footer-col a{display:block;text-decoration:none;color:var(--muted);font-size:.92rem;padding:5px 0}
.footer-col a:hover{color:var(--teal-700)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;margin-top:40px;padding-top:20px;border-top:1px solid var(--line);color:var(--muted);font-size:.85rem}
.to-top{text-decoration:none;color:var(--muted)}
.to-top:hover{color:var(--teal-700)}

/* ---------- Reveal animation (progressive enhancement) ---------- */
.reveal{transition:opacity .5s ease,transform .5s ease}
.js .reveal:not(.is-in){opacity:0;transform:translateY(16px)}
@media (prefers-reduced-motion:reduce){
  .js .reveal:not(.is-in){opacity:1;transform:none}
  .reveal{transition:none}
}

/* ---------- Responsive ---------- */
@media (max-width:900px){
  .nav,.header-actions{display:none}
  .burger{display:flex}
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .lede{max-width:none}
  .cards{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:560px){
  .hero{padding:48px 0 44px}
  .section{padding:56px 0}
  .cards{grid-template-columns:1fr}
  .table__head,.table--wide .table__head{display:none}
  .table__row,.table--wide .table__row{grid-template-columns:56px 1fr;gap:8px 12px;row-gap:6px}
  .table__row span[role="cell"]:nth-child(3),
  .table__row span[role="cell"]:nth-child(4),
  .table__row span[role="cell"]:nth-child(5){grid-column:2}
  .footer-grid{grid-template-columns:1fr}
  .chain__step{flex-basis:100%;border-right:none;border-bottom:1px solid var(--line-strong)}
  .chain__step:last-child{border-bottom:none}
}