:root{
  --bg:#ffffff; --fg:#1a1d21; --muted:#5b6570; --line:#e3e7ec;
  --accent:#0b6b53; --accent-fg:#ffffff; --soft:#f5f7f9; --warn:#8a6100; --warnbg:#fff8e6;
  --max:44rem;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#14171a;--fg:#e8eaed;--muted:#a0a8b0;--line:#2a2f35;--accent:#3fbf9a;--accent-fg:#0d1114;--soft:#1c2024;--warn:#e0b45a;--warnbg:#2a2317;}
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);
  font:400 17px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
a{color:var(--accent);text-underline-offset:2px}
img{max-width:100%;height:auto}
.wrap{max-width:var(--max);margin:0 auto;padding:0 1.15rem}
/* header */
.site-head{border-bottom:1px solid var(--line)}
.site-head .wrap{display:flex;flex-wrap:wrap;gap:.6rem 1.2rem;align-items:baseline;padding-top:1.1rem;padding-bottom:1.1rem}
.brand{font-weight:700;font-size:1.15rem;color:var(--fg);text-decoration:none;letter-spacing:-.01em}
.site-head nav{margin-left:auto;display:flex;gap:1rem;flex-wrap:wrap}
.site-head nav a{color:var(--muted);text-decoration:none;font-size:.92rem}
.site-head nav a:hover{color:var(--accent)}
/* main */
main{padding:2rem 0 3rem}
h1{font-size:2rem;line-height:1.2;letter-spacing:-.02em;margin:.2rem 0 .8rem}
h2{font-size:1.3rem;line-height:1.3;margin:2.4rem 0 .7rem;letter-spacing:-.01em}
h3{font-size:1.05rem;margin:1.5rem 0 .4rem}
p{margin:0 0 1rem}
.lede{font-size:1.1rem;color:var(--fg)}
.meta{color:var(--muted);font-size:.88rem;margin:0 0 1.4rem}
/* disclosure */
.disclosure{background:var(--warnbg);color:var(--warn);border:1px solid currentColor;
  border-radius:.5rem;padding:.65rem .85rem;font-size:.87rem;line-height:1.5;margin:0 0 1.6rem}
.disclosure a{color:inherit}
/* tables */
.tablewrap{overflow-x:auto;margin:0 0 1.2rem;border:1px solid var(--line);border-radius:.6rem}
table{border-collapse:collapse;width:100%;font-size:.94rem}
th,td{text-align:left;padding:.6rem .8rem;border-bottom:1px solid var(--line);vertical-align:top}
th{background:var(--soft);font-weight:600;white-space:nowrap}
tr:last-child td{border-bottom:0}
/* cot gia: du rong de "$12.95 /month, billed annually" khong vo vun */
td:nth-child(2){min-width:8rem}
td .meta{display:block;font-size:.82rem;margin-top:.1rem}
.checked{font-size:.85rem;color:var(--muted);margin:-.7rem 0 1.4rem}
/* lists */
ul,ol{margin:0 0 1.1rem;padding-left:1.25rem}
li{margin:.3rem 0}
.cols{display:grid;grid-template-columns:1fr 1fr;gap:0 1.6rem}
@media (max-width:34rem){.cols{grid-template-columns:1fr;gap:0}}
.pros li::marker{color:var(--accent)}
.cons li::marker{color:#c2554a}
/* hero: anh san pham | khoi chot */
.hero{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);gap:1.5rem;
  align-items:start;margin:0 0 1.8rem}
@media (max-width:40rem){.hero{grid-template-columns:1fr;gap:1.1rem}}
.hero-img{margin:0}
.hero-img>img{width:100%;aspect-ratio:1;object-fit:cover;border-radius:.7rem;
  border:1px solid var(--line);background:var(--soft);display:block}
.thumbs{display:grid;grid-template-columns:repeat(3,1fr);gap:.5rem;margin-top:.5rem}
.thumbs .thumb{width:100%;aspect-ratio:1;object-fit:cover;border-radius:.4rem;
  border:1px solid var(--line);background:var(--soft);display:block}
.hero-info .verdict-box{margin:0}
/* khoi chot o dau trang */
.verdict-box{border:1px solid var(--accent);border-radius:.7rem;padding:1rem 1.15rem;margin:0 0 1.6rem;
  background:var(--soft)}
.verdict-box p{margin:0 0 .55rem}
.vb-line{font-size:1.05rem;font-weight:600;line-height:1.5}
.vb-best{font-size:.94rem;color:var(--muted)}
.vb-cta{display:flex;flex-wrap:wrap;align-items:center;gap:.7rem;margin:0!important}
.vb-price{font-weight:600;font-size:.95rem}
.btn-sm{padding:.5rem .95rem;font-size:.92rem;border-radius:.45rem}
/* khu nhuoc diem: noi ro no anh huong toi AI */
.defuse{color:var(--muted);font-size:.9em}
/* cta */
.cta{margin:2rem 0}
.btn{display:inline-block;background:var(--accent);color:var(--accent-fg);text-decoration:none;
  font-weight:600;padding:.8rem 1.4rem;border-radius:.55rem;line-height:1.3}
.btn:hover{filter:brightness(1.08)}
.cta small{display:block;color:var(--muted);font-size:.85rem;margin-top:.5rem}
/* cards */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(15rem,1fr));gap:1.1rem;margin:1.5rem 0 0;padding:0;list-style:none}
.card{border:1px solid var(--line);border-radius:.7rem;margin:0;overflow:hidden;
  display:flex;flex-direction:column;transition:border-color .15s,transform .15s}
.card:hover{border-color:var(--accent);transform:translateY(-2px)}
.card-body{padding:.95rem 1.05rem 1.1rem}
.card:not(.has-img) .card-body{padding-top:1.05rem}
.card-img{display:block;line-height:0;background:var(--soft);border-bottom:1px solid var(--line)}
.card-img img{width:100%;aspect-ratio:4/3;object-fit:cover;display:block}
.card a{text-decoration:none;font-weight:600;display:block;margin-bottom:.35rem;line-height:1.35}
.card-price{color:var(--accent)!important;font-weight:600;font-size:.88rem!important;margin:0 0 .4rem!important}
.card p{color:var(--muted);font-size:.9rem;margin:0}
.empty{border:1px dashed var(--line);border-radius:.7rem;padding:1.3rem;color:var(--muted)}
/* roundup: moi san pham mot ngoi vi */
.guides{list-style:none;margin:1.2rem 0 0;padding:0}
.guides li{border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:.5rem;
  padding:.8rem 1rem;margin:0 0 .6rem}
.guides a{font-weight:600;text-decoration:none;display:block}
.guides span{color:var(--muted);font-size:.86rem}
table.summary td:first-child{font-weight:600;white-space:normal}
.pick{border-top:1px solid var(--line);padding-top:1.6rem;margin-top:2.2rem;scroll-margin-top:1rem}
.pick.no-link{opacity:.97}
.award{display:inline-block;background:var(--accent);color:var(--accent-fg);font-size:.76rem;
  font-weight:700;letter-spacing:.03em;text-transform:uppercase;padding:.25rem .6rem;
  border-radius:.3rem;margin:0 0 .5rem}
.pick.no-link .award{background:var(--soft);color:var(--muted);border:1px solid var(--line)}
.pick h3{margin:.1rem 0 .8rem;font-size:1.25rem}
.pick-price{color:var(--accent);font-weight:600;font-size:.95rem;white-space:nowrap}
.pick-body{display:grid;grid-template-columns:13rem minmax(0,1fr);gap:1.2rem;align-items:start}
@media (max-width:38rem){.pick-body{grid-template-columns:1fr}}
.pick-img{margin:0}
.pick-img img{width:100%;aspect-ratio:1;object-fit:cover;border-radius:.6rem;
  border:1px solid var(--line);background:var(--soft);display:block}
.why{margin:0 0 .8rem}
.specs{display:grid;grid-template-columns:auto 1fr;gap:.25rem .8rem;margin:0 0 .9rem;
  font-size:.9rem;border-top:1px solid var(--line);padding-top:.7rem}
.specs dt{color:var(--muted)}
.specs dd{margin:0;font-weight:600}
.pick h4{font-size:.92rem;margin:.6rem 0 .3rem}
.pick .cols ul{font-size:.92rem}
.pick-cta{display:flex;flex-wrap:wrap;align-items:center;gap:.9rem;margin:1rem 0 0}
.pick-more{font-size:.9rem}
.pick-nolink{color:var(--muted);font-size:.88rem;font-style:italic;margin:1rem 0 0;
  border-left:2px solid var(--line);padding-left:.7rem}
/* faq */
details{border-bottom:1px solid var(--line);padding:.75rem 0}
summary{cursor:pointer;font-weight:600}
details p{margin:.6rem 0 0;color:var(--muted)}
/* author */
.author{border-top:1px solid var(--line);margin-top:2.5rem;padding-top:1rem;color:var(--muted);font-size:.9rem}
/* footer */
.site-foot{border-top:1px solid var(--line);padding:1.6rem 0 2.5rem;color:var(--muted);font-size:.87rem}
.site-foot nav{display:flex;flex-wrap:wrap;gap:.5rem 1.1rem;margin-bottom:.8rem}
.site-foot a{color:var(--muted)}
.site-foot p{margin:0 0 .5rem}
/* redirect page */
.redirect{text-align:center;padding:4rem 1rem;color:var(--muted)}