/* ===== 1. COLOURS (change here only) ===== */
:root{
  --bg:#FFFFFF;          /* plain page background */
  --card:#F8FAFC;       /* cards, table, code */
  --ink:#0F172A;        /* main text */
  --muted:#475569;      /* secondary text */
  --line:#E2E8F0;       /* borders */
  --navy:#1E3A5F;       /* headings, buttons */
  --teal:#0F766E;       /* accent */
  --teal-soft:#E6F4F1;
}
/* ===== 2. BASE ===== */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.7 "Inter",system-ui,-apple-system,"Segoe UI",sans-serif}
h1,h2,h3{font-family:"Inter",system-ui,sans-serif;color:var(--navy);line-height:1.2;margin:0 0 .5em}
h1{font-size:clamp(2.2rem,5.5vw,3.6rem);font-weight:700;letter-spacing:-.02em}
h2{font-size:clamp(1.6rem,3.5vw,2.1rem);font-weight:700;letter-spacing:-.01em}
h3{font-size:1.1rem;font-weight:600}
.sub{margin-top:40px}
p{margin:0 0 1em;max-width:68ch}
a{color:var(--teal)}
:focus-visible{outline:3px solid var(--teal);outline-offset:2px}
.wrap{max-width:1040px;margin:0 auto;padding:0 20px}
section{padding:64px 0;border-top:1px solid var(--line)}
.code-tag{font-size:.8rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--teal);margin-bottom:10px}
.glow{color:var(--teal)}
/* ===== 3. NAV ===== */
nav.top{background:var(--bg);padding:16px 0}
nav.top .wrap{display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap}
.brand{font-weight:700;color:var(--navy)}
.brand span{color:var(--teal)}
nav.top ul{list-style:none;margin:0;padding:0;display:flex;gap:18px;flex-wrap:wrap;font-size:.93rem}
nav.top a{color:var(--muted);text-decoration:none;font-weight:500}
nav.top a:hover{color:var(--navy)}
/* ===== 4. HERO (centered) ===== */
.hero{padding:72px 0 80px;text-align:center}
.hero p{margin-left:auto;margin-right:auto}
.lead{font-size:1.18rem;color:var(--muted)}
.btn{display:inline-block;background:var(--navy);color:#fff;font-weight:600;padding:12px 24px;border-radius:8px;text-decoration:none}
.btn:hover{background:#16304E}
.btn.ghost{background:transparent;color:var(--navy);border:1px solid var(--line);margin-left:10px}
.btn.ghost:hover{background:var(--card)}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;margin-top:44px;text-align:left}
.stat{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:16px;color:var(--muted);font-size:.95rem}
.stat b{display:block;font-size:1.1rem;color:var(--navy)}
/* ===== 5. CARDS ===== */
.grid,.two{display:grid;gap:16px;margin-top:22px}
.grid{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.two{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:22px}
.card p{margin:0;font-size:.96rem;color:var(--muted)}
.card ul{margin:0;padding-left:20px;color:var(--muted)}
.card li{margin-bottom:.5em}
.tag{display:inline-block;font-size:.74rem;font-weight:600;color:var(--teal);background:var(--teal-soft);padding:2px 10px;border-radius:999px;margin-bottom:10px}
.callout{background:var(--teal-soft);border-left:4px solid var(--teal);padding:16px 20px;border-radius:0 8px 8px 0;margin:24px 0;max-width:72ch}
.callout p{margin:0}
/* ===== 6. LOOP + STEPS ===== */
ol.pipe{list-style:none;counter-reset:p;display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:14px;padding:0;margin:24px 0}
ol.pipe li{counter-increment:p;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:16px}
ol.pipe li::before{content:"0" counter(p);font-size:.8rem;font-weight:700;color:var(--teal)}
ol.pipe b{display:block;font-size:1rem;color:var(--navy)}
ol.pipe span{font-size:.93rem;color:var(--muted)}
ol.steps{list-style:none;counter-reset:s;padding:0;margin:24px 0 0}
ol.steps li{counter-increment:s;display:grid;grid-template-columns:44px 1fr;gap:16px;padding:18px 0;border-top:1px solid var(--line)}
ol.steps li::before{content:counter(s);width:36px;height:36px;border-radius:50%;background:var(--navy);color:#fff;font-weight:600;display:grid;place-items:center}
ol.steps p{margin:0;color:var(--muted)}
ol.steps h3{margin-bottom:.3em}
/* ===== 7. TABLE, CODE, DL, FAQ ===== */
.scroll{overflow-x:auto;margin-top:22px;border:1px solid var(--line);border-radius:10px}
table{border-collapse:collapse;width:100%;min-width:620px;font-size:.95rem}
th,td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:var(--navy);color:#fff;font-weight:600;font-size:.88rem}
td:first-child{color:var(--navy);font-weight:600}
td{color:var(--muted)}
tr:last-child td{border-bottom:0}
pre.code{background:#0F172A;border-radius:10px;padding:18px;overflow-x:auto;font-family:"JetBrains Mono",ui-monospace,monospace;font-size:.88rem;color:#E2E8F0;margin:18px 0}
dl{display:grid;grid-template-columns:minmax(130px,210px) 1fr;gap:12px 22px;margin:20px 0 0}
dt{font-weight:600;color:var(--navy)}
dd{margin:0;color:var(--muted)}
@media(max-width:560px){dl{grid-template-columns:1fr}dd{margin-bottom:8px}.btn.ghost{margin:10px 0 0}}
details{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:14px 18px;margin-bottom:10px}
details[open]{border-color:var(--teal)}
summary{cursor:pointer;font-weight:600;color:var(--navy)}
details p{margin:10px 0 0;color:var(--muted)}
/* ===== 8. FOOTER ===== */
footer{border-top:1px solid var(--line);padding:28px 0 44px;text-align:center;font-size:.88rem;color:var(--muted)}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}