:root{
  --bg:#f5f6f8; --surface:#fff; --ink:#1f2530; --muted:#6b7280; --line:#e5e7eb;
  --brand:#3b5bdb; --brand-d:#2f49b2; --ok:#137a3f; --okbg:#e6f4ec;
  --err:#b42318; --errbg:#fdecea; --radius:12px;
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.5}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
h1{font-size:1.7rem;margin:.6em 0 .4em}
h2{font-size:1.2rem;margin:1.2em 0 .5em}
.muted{color:var(--muted)}
.small{font-size:.85rem}
code{background:#eef0f4;padding:1px 6px;border-radius:5px;font-size:.88em}

/* topbar */
.topbar{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.topbar-inner{display:flex;align-items:center;gap:18px;height:62px}
.brand{font-weight:700;font-size:1.2rem;color:var(--ink)}
.brand:hover{text-decoration:none}
.search{display:flex;flex:1;max-width:460px}
.search input{flex:1;padding:9px 12px;border:1px solid var(--line);border-radius:8px 0 0 8px;outline:none}
.search button{padding:9px 16px;border:1px solid var(--brand);background:var(--brand);color:#fff;border-radius:0 8px 8px 0;cursor:pointer}
.search.wide{max-width:none;margin:12px 0}
.search.wide input{border-radius:8px 0 0 8px}
.nav{display:flex;align-items:center;gap:16px;font-size:.95rem}
.nav a{color:var(--ink)}
.nav .staff{color:var(--brand);font-weight:600}
.pill{background:var(--brand);color:#fff;border-radius:20px;padding:0 7px;font-size:.75rem}
.linklike{background:none;border:none;color:var(--ink);cursor:pointer;font:inherit;padding:0}
.linklike.danger{color:var(--err)}

.demo-ribbon{background:#fff7e6;color:#8a5a00;text-align:center;font-size:.82rem;padding:6px;border-bottom:1px solid #ffe5a8;letter-spacing:.02em}
.announce{padding:8px 20px;color:var(--muted);font-size:.9rem}

/* buttons */
.btn,.btn-sm,.btn-ghost{display:inline-block;border-radius:8px;cursor:pointer;border:1px solid var(--brand);
  background:var(--brand);color:#fff;text-align:center;font:inherit}
.btn{padding:11px 20px}
.btn-sm{padding:7px 14px;font-size:.9rem}
.btn:hover,.btn-sm:hover{background:var(--brand-d);text-decoration:none}
.btn-ghost{background:#fff;color:var(--brand)}
.btn.danger{background:var(--err);border-color:var(--err)}
.btn[disabled]{opacity:.5;cursor:not-allowed}

/* flash */
.flash{padding:11px 14px;border-radius:8px;margin:12px 0}
.flash-ok{background:var(--okbg);color:var(--ok)}
.flash-error{background:var(--errbg);color:var(--err)}

/* hero */
.hero{background:linear-gradient(120deg,#3b5bdb,#5b76e6);color:#fff;border-radius:var(--radius);padding:44px 36px;margin:20px 0}
.hero h1{margin:0 0 10px;color:#fff}
.hero p{max-width:560px;opacity:.95}
.hero .btn{background:#fff;color:var(--brand);border-color:#fff;margin-top:10px}

/* chips */
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}
.chip{background:var(--surface);border:1px solid var(--line);padding:6px 14px;border-radius:20px;color:var(--ink);font-size:.9rem}
.chip.active{background:var(--brand);color:#fff;border-color:var(--brand)}

/* grid of products */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px;margin:12px 0 26px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column}
.card-img{display:block;height:140px;background:linear-gradient(135deg,#eef1f8,#e3e8f6);display:flex;align-items:center;justify-content:center}
.ph{font-size:2.6rem;color:#aab4d4;font-weight:700}
.ph.big{font-size:5rem}
.card-body{padding:12px;display:flex;flex-direction:column;gap:5px}
.card-title{font-weight:600;color:var(--ink)}
.price{font-weight:700;font-size:1.05rem}
.price.big{font-size:1.5rem;margin:10px 0}

/* product page */
.crumbs{margin:14px 0;color:var(--muted);font-size:.9rem}
.product{display:grid;grid-template-columns:1fr 1fr;gap:28px;margin:14px 0}
.product-img{background:linear-gradient(135deg,#eef1f8,#e3e8f6);border-radius:var(--radius);min-height:280px;display:flex;align-items:center;justify-content:center}
.buy{display:flex;gap:10px;margin-top:14px;align-items:center}
.buy input{width:72px;padding:10px;border:1px solid var(--line);border-radius:8px}

/* tables */
.table{width:100%;border-collapse:collapse;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;margin:10px 0}
.table th,.table td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line)}
.table th{background:#fafbfc;font-size:.82rem;text-transform:uppercase;letter-spacing:.03em;color:var(--muted)}
.table tfoot td{border-bottom:none}
.table.compact th,.table.compact td{padding:7px 10px;font-size:.9rem}
.badge{display:inline-block;padding:2px 9px;border-radius:12px;font-size:.78rem;font-weight:600}
.badge-green{background:var(--okbg);color:var(--ok)}
.badge-red{background:var(--errbg);color:var(--err)}
.badge-blue{background:#e7eefc;color:#2f49b2}
.badge-gray{background:#eef0f4;color:#4b5563}

/* forms */
.form{display:flex;flex-direction:column;gap:12px;max-width:440px}
.form.wide{max-width:680px}
.form label{display:flex;flex-direction:column;gap:5px;font-size:.9rem;color:var(--muted)}
.form input,.form select,.form textarea{padding:10px 12px;border:1px solid var(--line);border-radius:8px;font:inherit;color:var(--ink);background:#fff}
.form .row{display:flex;gap:12px;flex-wrap:wrap}
.form .row>label{flex:1;min-width:120px}
.form .check{flex-direction:row;align-items:center;gap:8px;color:var(--ink)}
.mt{margin-top:14px}

/* auth */
.auth-card{max-width:400px;margin:30px auto;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:28px}
.demo-note{background:#f0f5ff;border:1px solid #d6e0ff;border-radius:8px;padding:12px 14px;margin:14px 0;font-size:.9rem}
.demo-note.small{font-size:.82rem;margin-top:16px}

/* checkout */
.checkout{display:grid;grid-template-columns:1.3fr 1fr;gap:24px;align-items:start}
.summary{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.sum-list{list-style:none;padding:0;margin:0}
.sum-list li{display:flex;justify-content:space-between;padding:6px 0;border-bottom:1px solid var(--line);font-size:.92rem}
.sum-total{display:flex;justify-content:space-between;font-weight:700;margin-top:12px;font-size:1.1rem}

/* columns / sidebar */
.cols{display:grid;grid-template-columns:220px 1fr;gap:24px;margin-top:18px}
.side{position:sticky;top:78px;align-self:start}
.side-title{font-weight:700;margin-bottom:10px}
.sidenav{display:flex;flex-direction:column;gap:2px}
.sidenav a{padding:9px 12px;border-radius:8px;color:var(--ink)}
.sidenav a:hover{background:#eef0f4;text-decoration:none}
.sidenav a.active{background:var(--brand);color:#fff}
.side-foot{margin-top:16px}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px;margin:12px 0}
.head-row{display:flex;justify-content:space-between;align-items:center}

/* stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:14px 0}
.stat{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.stat-n{font-size:1.7rem;font-weight:700}
.stat-l{color:var(--muted);font-size:.85rem}
.twocol{display:grid;grid-template-columns:1fr 1fr;gap:16px}

/* pager */
.pager{display:flex;gap:6px;margin:16px 0}
.pager a{padding:7px 12px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink)}
.pager a.active{background:var(--brand);color:#fff;border-color:var(--brand)}

/* footer */
.footer{background:var(--surface);border-top:1px solid var(--line);margin-top:40px;padding:26px 0}
.footcols{display:grid;grid-template-columns:2fr 1fr 1fr;gap:20px;margin-bottom:14px}
.footcols a{display:block;color:var(--muted);padding:3px 0}

/* error */
.error-page{text-align:center;padding:60px 0}
.error-code{font-size:4rem;font-weight:800;color:var(--brand)}

@media(max-width:820px){
  .product,.checkout,.twocol{grid-template-columns:1fr}
  .cols{grid-template-columns:1fr}
  .side{position:static}
  .stats{grid-template-columns:1fr 1fr}
  .footcols{grid-template-columns:1fr}
  .search{order:3;flex-basis:100%;max-width:none}
}