/* DWPlatform — QC & Implementation tutorials. Self-contained, no external deps. */
:root{
  --bg:#f6f7fb; --card:#ffffff; --ink:#1a2233; --muted:#5b6577; --line:#e6e9f0;
  --primary:#2563eb; --primary-050:#eef4ff; --accent:#0ea5a4; --danger:#dc2626;
  --warn:#d97706; --ok:#16a34a; --radius:14px; --shadow:0 1px 3px rgba(16,24,40,.06),0 8px 24px rgba(16,24,40,.06);
  --maxw:1080px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);
  font:15.5px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;-webkit-font-smoothing:antialiased}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.25;color:var(--ink);margin:1.6em 0 .5em}
h1{font-size:2rem;margin-top:.2em}
h2{font-size:1.5rem;border-bottom:2px solid var(--line);padding-bottom:.3em}
h3{font-size:1.2rem}
p{margin:.6em 0}
code{background:#eef1f7;padding:.12em .4em;border-radius:6px;font:.85em ui-monospace,"SF Mono",Menlo,Consolas,monospace}
hr{border:0;border-top:1px solid var(--line);margin:2em 0}

/* Top bar */
.topbar{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.9);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line)}
.topbar .inner{max-width:var(--maxw);margin:0 auto;display:flex;align-items:center;gap:18px;
  padding:12px 22px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:-.01em}
.brand .logo{width:30px;height:30px;border-radius:8px;background:linear-gradient(135deg,var(--primary),var(--accent));
  display:grid;place-items:center;color:#fff;font-weight:900;font-size:14px}
.nav{display:flex;gap:4px;flex-wrap:wrap;margin-left:auto}
.nav a{padding:7px 12px;border-radius:9px;color:var(--muted);font-weight:600;font-size:.92rem}
.nav a:hover{background:var(--primary-050);color:var(--primary);text-decoration:none}
.nav a.active{background:var(--primary);color:#fff}

.wrap{max-width:var(--maxw);margin:0 auto;padding:26px 22px 80px}
.lead{font-size:1.12rem;color:var(--muted);max-width:70ch}

/* Cards / grid */
.grid{display:grid;gap:16px}
.grid.cols-2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.grid.cols-3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px 20px;box-shadow:var(--shadow)}
.card h3{margin-top:0}
.card .k{font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);font-weight:700}

/* Hero */
.hero{background:linear-gradient(135deg,#0b1220,#16233b);color:#eaf0ff;border-radius:20px;
  padding:38px 34px;box-shadow:var(--shadow);position:relative;overflow:hidden}
.hero h1{color:#fff;margin:0 0 .3em}
.hero p{color:#c4d0ea;max-width:66ch}
.hero .tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}
.hero .tag{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);color:#dce6ff;
  padding:5px 11px;border-radius:999px;font-size:.82rem;font-weight:600}

/* Figures / screenshots */
figure{margin:18px 0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  background:#fff;box-shadow:var(--shadow)}
figure img{display:block;width:100%;height:auto;border-bottom:1px solid var(--line)}
figcaption{padding:10px 16px;color:var(--muted);font-size:.9rem}
figcaption b{color:var(--ink)}

/* Steps */
.step{display:grid;grid-template-columns:44px 1fr;gap:16px;margin:22px 0;align-items:start}
.step .num{width:44px;height:44px;border-radius:12px;background:var(--primary);color:#fff;
  display:grid;place-items:center;font-weight:800;font-size:1.1rem;box-shadow:var(--shadow)}
.step .body{min-width:0}
.step h3{margin:.1em 0 .3em}

/* Callouts */
.note{border-left:4px solid var(--primary);background:var(--primary-050);padding:12px 16px;
  border-radius:0 10px 10px 0;margin:16px 0}
.note.warn{border-color:var(--warn);background:#fff7ed}
.note.danger{border-color:var(--danger);background:#fef2f2}
.note.ok{border-color:var(--ok);background:#f0fdf4}
.note b{color:var(--ink)}

/* Tables */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
table{border-collapse:collapse;width:100%;background:#fff;font-size:.93rem}
th,td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:#f2f5fb;font-weight:700;color:#33405a;white-space:nowrap;position:sticky;top:0}
tbody tr:hover{background:#fafbfe}
td code{white-space:nowrap}

/* Pills */
.pill{display:inline-block;padding:2px 9px;border-radius:999px;font-size:.78rem;font-weight:700;
  border:1px solid var(--line);background:#fff;color:var(--muted)}
.pill.blue{background:var(--primary-050);color:var(--primary);border-color:#cfe0ff}
.pill.green{background:#f0fdf4;color:var(--ok);border-color:#bbf7d0}
.pill.amber{background:#fff7ed;color:var(--warn);border-color:#fed7aa}
.pill.red{background:#fef2f2;color:var(--danger);border-color:#fecaca}
.pill.gray{background:#f3f4f6;color:#4b5563}

/* Module chips */
.modchips{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}
.modchip{display:flex;align-items:center;gap:7px;background:#fff;border:1px solid var(--line);
  border-radius:10px;padding:7px 11px;font-weight:600;font-size:.9rem;box-shadow:var(--shadow)}
.modchip .dot{width:9px;height:9px;border-radius:50%;background:var(--accent)}

footer.foot{max-width:var(--maxw);margin:0 auto;padding:24px 22px;color:var(--muted);
  border-top:1px solid var(--line);font-size:.9rem}
.small{font-size:.86rem;color:var(--muted)}
ul.tight li{margin:.2em 0}
.kbd{font:.8rem ui-monospace,monospace;background:#111827;color:#e5e7eb;padding:2px 7px;border-radius:6px}