:root{
  --paper:#f3f4f1; --panel:#fff; --ink:#141b17; --ink-soft:#4b564e; --line:#dde1db;
  --court:#12528a; --court-d:#0e3f6c; --net:#ffffff;
  --accent:#ff5a1f; --accent-d:#e2490f;
  --good:#0c7a4b; --bad:#b14627; --star:#f5a623;
  --max:1120px; --sans:'Be Vietnam Pro',system-ui,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--sans);color:var(--ink);background:var(--paper);font-size:17px;line-height:1.62;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--court);text-decoration:none}
.wrap{max-width:var(--max);margin:0 auto;padding:0 22px}

/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(243,244,241,.86);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;gap:26px;height:66px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;letter-spacing:-.4px;color:var(--ink)}
.brand .mk{width:30px;height:30px;flex:none}
.nav nav{display:flex;gap:24px;margin-left:auto;flex-wrap:wrap}
.nav nav a{color:var(--ink-soft);font-weight:600;font-size:15px}
.nav nav a:hover{color:var(--court)}

/* hero */
.hero{border-bottom:1px solid var(--line);overflow:hidden}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center;padding:56px 22px 60px}
.hero h1{font-size:clamp(34px,5vw,56px);font-weight:900;line-height:1.02;letter-spacing:-1.4px;margin:0 0 18px}
.hero h1 .u{box-shadow:inset 0 -.32em 0 rgba(255,90,31,.22)}
.hero .lead{font-size:19px;color:var(--ink-soft);max-width:30em;margin:0 0 26px}
.hero .actions{display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.btn-primary{background:var(--accent);color:#fff;font-weight:800;font-size:16px;padding:15px 28px;border-radius:12px;box-shadow:0 10px 22px -8px rgba(255,90,31,.6);transition:transform .12s,background .15s}
.btn-primary:hover{background:var(--accent-d);transform:translateY(-2px)}
.btn-ghost{color:var(--ink);font-weight:700;padding:15px 8px}
.hero-art{position:relative}
.courtfx{width:100%;height:auto;display:block;filter:drop-shadow(0 20px 40px rgba(14,63,108,.28))}

/* sections */
section{padding:56px 0}
.head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:28px;flex-wrap:wrap}
.head h2{font-size:30px;font-weight:800;letter-spacing:-.6px;margin:0}
.head p{color:var(--ink-soft);margin:6px 0 0;max-width:40em}

/* featured editorial index */
.index{display:grid;grid-template-columns:1.4fr 1fr;gap:26px}
.feat{position:relative;border-radius:18px;overflow:hidden;background:var(--court);color:#fff;min-height:340px;display:flex;flex-direction:column;justify-content:flex-end;padding:30px;transition:transform .15s}
.feat:hover{transform:translateY(-3px)}
.feat .fx{position:absolute;inset:0;opacity:.5}
.feat .k{position:relative;font-weight:700;font-size:13px;color:#bfe0ff;margin-bottom:10px}
.feat h3{position:relative;font-size:27px;font-weight:800;line-height:1.15;margin:0 0 10px;max-width:14em}
.feat p{position:relative;color:#d7e8f6;margin:0 0 4px;max-width:28em}
.stack{display:flex;flex-direction:column;gap:18px}
.mini{display:flex;gap:16px;align-items:center;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:16px;transition:border-color .15s,transform .12s}
.mini:hover{border-color:#bcd3e6;transform:translateY(-2px)}
.mini .mi{width:74px;height:74px;flex:none;border-radius:11px}
.mini .k{font-weight:700;font-size:12px;color:var(--court)}
.mini h4{margin:4px 0 4px;font-size:16.5px;line-height:1.25;color:var(--ink)}
.mini p{margin:0;color:var(--ink-soft);font-size:13.5px}
.soon{font-size:11px;font-weight:700;color:#8a948c;border:1px solid var(--line);border-radius:999px;padding:2px 9px;display:inline-block}

/* racket string-grid thumbnail */
.grid-thumb{position:relative;background:
   repeating-linear-gradient(90deg,rgba(18,82,138,.16) 0 1px,transparent 1px 9px),
   repeating-linear-gradient(0deg,rgba(18,82,138,.16) 0 1px,transparent 1px 9px),
   radial-gradient(120% 120% at 50% 40%,#eef4f8,#dbe7f0);}
.grid-thumb::after{content:'';position:absolute;inset:16% 24%;border:2px solid rgba(18,82,138,.35);border-radius:50% 50% 48% 48%/60% 60% 40% 40%}
.rankno{position:absolute;top:8px;left:10px;font-weight:900;font-size:26px;color:var(--court);opacity:.9;line-height:1}

/* article */
.post{max-width:800px;margin:0 auto;padding:40px 0}
.crumb{font-size:14px;color:var(--ink-soft);margin-bottom:14px}
.crumb a{color:var(--ink-soft)}
.post h1{font-size:clamp(30px,4.4vw,44px);font-weight:900;letter-spacing:-1px;line-height:1.06;margin:0 0 12px}
.post .meta{color:var(--ink-soft);font-size:14.5px;margin-bottom:24px;padding-bottom:20px;border-bottom:2px solid var(--ink)}
.post .intro{font-size:19.5px;line-height:1.6}
.post h2{font-size:25px;font-weight:800;letter-spacing:-.5px;margin:40px 0 14px}
.post p{margin:0 0 15px}
.disc{background:#fff;border:1px solid var(--line);border-left:4px solid var(--accent);color:var(--ink-soft);font-size:14px;padding:13px 16px;border-radius:8px;margin:20px 0}

/* comparison table */
.cmp{width:100%;border-collapse:collapse;margin:20px 0;font-size:15px}
.cmp th,.cmp td{padding:13px 14px;text-align:left;border-bottom:1px solid var(--line)}
.cmp thead th{background:var(--ink);color:#fff;font-weight:700;border-bottom:none}
.cmp tbody td:first-child{font-weight:700}
.cmp tbody tr:nth-child(odd){background:#fafbf9}

/* ranked product entries */
.hero-pick{background:var(--panel);border:1px solid var(--line);border-radius:18px;overflow:hidden;margin:26px 0;box-shadow:0 14px 40px -24px rgba(20,27,23,.5)}
.hero-pick .banner{background:var(--accent);color:#fff;font-weight:800;font-size:13px;padding:9px 20px;display:flex;align-items:center;gap:8px}
.hero-pick .in{display:grid;grid-template-columns:230px 1fr;gap:26px;padding:24px}
.hero-pick .grid-thumb{height:210px;border-radius:12px}
.hero-pick h3{font-size:26px;font-weight:800;margin:0 0 6px}
.stars{color:var(--star);letter-spacing:2px;font-size:17px}.score{color:var(--ink-soft);font-size:14px;margin-left:6px}
.hero-pick .desc{margin:12px 0;font-size:16px}
.pc{display:flex;gap:30px;flex-wrap:wrap;margin:8px 0 2px}
.pc ul{margin:5px 0;padding-left:18px;font-size:14.5px}
.pc .tt{font-size:12px;font-weight:800;color:var(--ink-soft);letter-spacing:.3px}
.pc .pros li{color:var(--good)}.pc .cons li{color:var(--bad)}
.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:16px}
.btn{font-weight:800;padding:12px 20px;border-radius:10px;font-size:15px;color:#fff;display:inline-flex;align-items:center;gap:8px;transition:transform .12s,filter .15s}
.btn:hover{transform:translateY(-2px);filter:brightness(1.05)}
.btn-shopee{background:#ee4d2d}.btn-lazada{background:#0f146d}
.btn[data-pending]{background:#c9d1cb;color:#fff;cursor:not-allowed;pointer-events:none;transform:none}
.btn[data-pending]::after{content:' · sắp có'}

.row{display:grid;grid-template-columns:54px 150px 1fr auto;gap:20px;align-items:center;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:16px 20px;margin:14px 0}
.row .n{font-weight:900;font-size:30px;color:var(--court);opacity:.85;text-align:center}
.row .grid-thumb{height:92px;border-radius:9px}
.row h3{margin:0 0 4px;font-size:19px;font-weight:800}
.row .rdesc{color:var(--ink-soft);font-size:14px;margin:4px 0 0}
.row .rcta{display:flex;gap:8px;flex-wrap:wrap}
.row .btn{padding:9px 14px;font-size:13.5px}

/* ---------- racket detail (light) ---------- */
.detail{padding:30px 0 10px}
.detail .crumb{margin-bottom:16px}
.dtop{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:center}
.pstage{position:relative;height:440px;border-radius:20px;border:1px solid var(--line);
  background:radial-gradient(80% 70% at 50% 30%,rgba(18,82,138,.12),transparent 62%),linear-gradient(170deg,#fff,#eef3f6);
  display:grid;place-items:center;overflow:hidden}
.pstage img{max-height:86%;width:auto;object-fit:contain}
.pstage .silh{height:84%;width:auto;filter:drop-shadow(0 16px 24px rgba(18,82,138,.18))}
.pstage .ph{position:absolute;bottom:12px;left:0;right:0;text-align:center;color:#8a948c;font-size:12px}
.dinfo .hng{font-weight:700;color:var(--court);font-size:14px}
.dinfo h1{font-size:clamp(28px,4vw,40px);font-weight:900;letter-spacing:-1px;line-height:1.05;margin:6px 0 10px}
.dinfo .sum{color:var(--ink-soft);font-size:16.5px;margin:12px 0 16px}
.meter{margin:18px 0}
.meter .lab{display:flex;justify-content:space-between;font-size:13px;color:var(--ink-soft);font-weight:700;margin-bottom:7px}
.meter .bar{position:relative;height:10px;border-radius:999px;background:linear-gradient(90deg,#0c7a4b,#12528a,#ff5a1f)}
.meter .dot{position:absolute;top:50%;width:18px;height:18px;border-radius:50%;background:#fff;border:3px solid var(--court);transform:translate(-50%,-50%);box-shadow:0 2px 6px rgba(0,0,0,.25)}
.specs{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:26px 0}
.spec{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:13px 16px}
.spec .l{color:#8a948c;font-size:12.5px;font-weight:700}
.spec .v{color:var(--ink);font-size:16.5px;font-weight:700;margin-top:3px}
.block{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:24px;margin:22px 0;box-shadow:0 14px 40px -28px rgba(20,27,23,.5)}
.block h2{margin:0 0 12px;font-size:22px;font-weight:800}
.block p{margin:0 0 12px;color:var(--ink-soft)}
.bars .b{margin:12px 0}
.bars .bt{display:flex;justify-content:space-between;font-size:14px;color:var(--ink-soft);margin-bottom:5px;font-weight:600}
.bars .bg{height:8px;border-radius:999px;background:#e7ecea;overflow:hidden}
.bars .bf{height:100%;border-radius:999px;background:linear-gradient(90deg,var(--court),#3aa0d8)}

/* tech cards + faq */
.tgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:14px}
.tcard{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:14px 16px}
.tcard .tn{font-weight:800;color:var(--court);font-size:15px;margin-bottom:4px}
.tcard .td{color:var(--ink-soft);font-size:14px}
.faq{border-bottom:1px solid var(--line);padding:12px 2px}
.faq summary{cursor:pointer;font-weight:700;font-size:16px;list-style:none;display:flex;gap:8px;align-items:flex-start}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:'+';color:var(--accent);font-weight:900;font-size:19px;line-height:1.2}
.faq[open] summary::before{content:'–'}
.faq p{margin:10px 0 0 26px;color:var(--ink-soft)}

/* vợt index grid */
.vgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:20px}
.vcard{display:flex;flex-direction:column;background:var(--panel);border:1px solid var(--line);border-radius:16px;overflow:hidden;transition:transform .15s,box-shadow .2s}
.vcard:hover{transform:translateY(-4px);box-shadow:0 18px 40px -26px rgba(20,27,23,.6)}
.vcard .vtop{height:170px;display:grid;place-items:center;background:linear-gradient(170deg,#fff,#eef3f6);border-bottom:1px solid var(--line)}
.vcard .vtop .silh{height:88%;width:auto}
.vcard .vb{padding:16px 18px}
.vcard .vk{font-weight:700;font-size:12px;color:var(--court)}
.vcard h3{margin:4px 0 6px;font-size:18px;font-weight:800}
.vcard .vspec{color:var(--ink-soft);font-size:13.5px;margin:0 0 10px}
.vcard .vtag{font-weight:700;font-size:13.5px;color:var(--accent)}

/* footer */
footer{background:var(--ink);color:#aeb8b0;padding:40px 0;margin-top:40px;font-size:14.5px}
footer .wrap{display:flex;gap:34px;flex-wrap:wrap;justify-content:space-between}
footer h4{color:#fff;margin:0 0 10px;font-size:15px}
footer a{color:#7fd3a6}
.fdisc{font-size:12.5px;opacity:.65;margin-top:16px;max-width:680px}

@media(max-width:860px){
  .hero .wrap{grid-template-columns:1fr;gap:26px;padding:40px 22px 44px}
  .hero-art{order:-1;max-width:420px}
  .index{grid-template-columns:1fr}
  .hero-pick .in{grid-template-columns:1fr}
  .row{grid-template-columns:40px 1fr;grid-auto-flow:row}
  .row .grid-thumb,.row .rcta{grid-column:2}
}