:root{
  --bg:#f5f7fb; --card:#fff; --ink:#14213d; --muted:#6b7590; --line:#e3e8f2;
  --brand:#0a7cff; --brand-ink:#fff; --good:#13a05f; --warn:#d98a00; --bad:#c9302c;
  --radius:14px; --shadow:0 1px 2px rgba(20,33,61,.06),0 4px 16px rgba(20,33,61,.06);
}
@media (prefers-color-scheme:dark){
  :root{--bg:#0f1420;--card:#171e2d;--ink:#e8ecf5;--muted:#9aa4bd;--line:#263049;--shadow:none}
}
*{box-sizing:border-box}
body{margin:0;font:16px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--ink)}
.wrap{max-width:1200px;margin:0 auto;padding:0 16px}
a{color:var(--brand)}
.muted{color:var(--muted)}

/* header */
.topbar{position:sticky;top:0;z-index:10;background:var(--card);border-bottom:1px solid var(--line)}
.topbar-inner{display:flex;gap:24px;align-items:center;height:64px}
.logo{display:flex;align-items:center;gap:8px;font-weight:700;font-size:1.15rem;color:var(--ink);text-decoration:none;white-space:nowrap}
.logo-mark{display:grid;place-items:center;width:32px;height:32px;border-radius:9px;background:var(--brand);color:#fff}
.search{flex:1;position:relative;max-width:560px}
.search svg{position:absolute;left:12px;top:50%;width:18px;height:18px;transform:translateY(-50%);fill:none;stroke:var(--muted);stroke-width:2}
.search input{width:100%;height:42px;padding:0 14px 0 38px;border:1px solid var(--line);border-radius:999px;background:var(--bg);color:var(--ink);font:inherit}
.search input:focus{outline:2px solid var(--brand);outline-offset:1px}

.hero{background:linear-gradient(135deg,#0a7cff,#5b3df5);color:#fff;padding:36px 0}
.hero h1{margin:0 0 6px;font-size:clamp(1.5rem,3vw,2.2rem)}
.hero p{margin:0;opacity:.9}

/* layout */
.layout{display:grid;grid-template-columns:240px 1fr;gap:28px;padding-top:28px;padding-bottom:48px}
@media (max-width:820px){.layout{grid-template-columns:1fr}.logo span+*{display:none}}
.filters h2{font-size:.8rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:20px 0 10px}
.filters h2:first-child{margin-top:0}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chip{border:1px solid var(--line);background:var(--card);color:var(--ink);padding:5px 11px;border-radius:999px;font:inherit;font-size:.88rem;cursor:pointer}
.chip[aria-pressed=true]{background:var(--brand);border-color:var(--brand);color:#fff}
.store-list{display:grid;gap:6px}
.check{display:flex;align-items:center;gap:8px;cursor:pointer;font-size:.95rem;margin-top:14px}
.dot{width:10px;height:10px;border-radius:50%;display:inline-block;flex:none}
input[type=range]{width:100%;accent-color:var(--brand)}
.range-label{font-size:.9rem;color:var(--muted)}
.link-btn{margin-top:16px;background:none;border:0;color:var(--brand);font:inherit;cursor:pointer;padding:0}

.toolbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px;gap:12px;flex-wrap:wrap}
.toolbar select{margin-left:6px;padding:7px 10px;border-radius:9px;border:1px solid var(--line);background:var(--card);color:var(--ink);font:inherit}

/* grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;display:flex;flex-direction:column;gap:10px;cursor:pointer;transition:transform .12s,border-color .12s;text-align:left;font:inherit;color:inherit}
.card:hover,.card:focus-visible{transform:translateY(-2px);border-color:var(--brand);outline:none}
.thumb{height:130px;border-radius:10px;display:grid;place-items:center;background:var(--bg)}
.thumb svg{width:64px;height:64px;fill:none;stroke:var(--brand);stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
.cat{font-size:.75rem;color:var(--muted);text-transform:uppercase;letter-spacing:.05em}
.card h3{margin:0;font-size:1rem;line-height:1.3}
.stars{font-size:.85rem;color:var(--warn)}
.stars span{color:var(--muted)}
.price-row{margin-top:auto;display:flex;justify-content:space-between;align-items:end;gap:8px}
.from{font-size:.78rem;color:var(--muted)}
.price{font-size:1.35rem;font-weight:700}
.where{font-size:.82rem;color:var(--muted);text-align:right}
.badge{display:inline-block;font-size:.75rem;font-weight:600;padding:2px 8px;border-radius:999px;background:rgba(19,160,95,.12);color:var(--good)}
.empty{padding:40px;text-align:center;color:var(--muted)}

/* dialog */
dialog{border:0;border-radius:18px;padding:0;width:min(760px,calc(100% - 32px));background:var(--card);color:var(--ink);box-shadow:0 20px 60px rgba(0,0,0,.3)}
dialog::backdrop{background:rgba(10,15,30,.55)}
.close{position:absolute;right:14px;top:10px;font-size:1.8rem;background:none;border:0;color:var(--muted);cursor:pointer}
.d-head{display:grid;grid-template-columns:120px 1fr;gap:20px;padding:24px 24px 8px}
@media (max-width:560px){.d-head{grid-template-columns:1fr}}
.d-head .thumb{height:120px}
.d-head h2{margin:2px 0 6px;font-size:1.35rem;padding-right:28px}
.specs{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0 0;padding:0;list-style:none}
.specs li{font-size:.82rem;background:var(--bg);border:1px solid var(--line);padding:2px 9px;border-radius:999px}
.d-section{padding:12px 24px 24px}
.d-section h3{font-size:.85rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:10px 0}
table{width:100%;border-collapse:collapse}
th,td{padding:11px 8px;border-bottom:1px solid var(--line);text-align:left;font-size:.94rem}
th{font-size:.78rem;color:var(--muted);font-weight:600}
td.num,th.num{text-align:right;white-space:nowrap}
tr.best td{background:rgba(19,160,95,.07)}
tr.best td:first-child{box-shadow:inset 3px 0 var(--good)}
.store-name{display:flex;align-items:center;gap:8px;font-weight:600}
.stock-ok{color:var(--good)}.stock-low{color:var(--warn)}.stock-out{color:var(--bad)}
.go{display:inline-block;background:var(--brand);color:#fff;text-decoration:none;padding:6px 12px;border-radius:8px;font-size:.85rem;font-weight:600;white-space:nowrap}
.go[aria-disabled=true]{background:var(--line);color:var(--muted);pointer-events:none}
.chart{width:100%;height:120px;display:block}
.chart path.line{fill:none;stroke:var(--brand);stroke-width:2}
.chart path.area{fill:var(--brand);opacity:.1}
.chart-legend{display:flex;justify-content:space-between;font-size:.8rem;color:var(--muted)}
.table-scroll{overflow-x:auto}

/* app install bar */
.appbar{background:var(--card);border-bottom:1px solid var(--line)}
.appbar-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 16px;flex-wrap:wrap}
.appbar-text{display:flex;align-items:center;gap:12px}
.appbar-text svg{width:26px;height:26px;flex:none;fill:none;stroke:var(--brand);stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.appbar-text strong{display:block}
.appbar-text .muted{font-size:.85rem}
.appbar .go{padding:9px 16px;font-size:.92rem}

/* app button inside detail dialog */
.app-cta{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin:16px 24px 0;padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:var(--bg)}
.app-cta .muted{font-size:.85rem}

.footer{border-top:1px solid var(--line);padding:20px 0;color:var(--muted);font-size:.85rem}