/* ShopVietNSO — light + blue.
   Layout: sticky header with wallet chip, category tiles, dense nick grid with a sticky filter rail. */
:root{
  --bg:#f3f6fb;
  --surface:#ffffff;
  --surface-2:#eef3fb;
  --line:#dde5f1;
  --ink:#0f1b2d;
  --muted:#5b6b82;
  --blue:#1d5bd8;
  --blue-600:#1649b3;
  --blue-50:#e8f0ff;
  --price:#e0452b;
  --ok:#15803d;  --ok-bg:#e7f6ec;
  --warn:#b45309;--warn-bg:#fdf1e1;
  --bad:#b91c1c; --bad-bg:#fdeaea;
  --radius:12px;
  --shadow:0 1px 2px rgba(15,27,45,.06),0 6px 18px rgba(15,27,45,.06);
  --font:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --wrap:1200px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.6 var(--font);-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue);text-decoration:none}
a:hover{color:var(--blue-600)}
h1,h2,h3{line-height:1.25;text-wrap:balance;margin:0}
.ns-wrap{max-width:var(--wrap);margin:0 auto;padding-inline:16px}
.ns-ico{flex:none}
:focus-visible{outline:2px solid var(--blue);outline-offset:2px;border-radius:4px}

.screen-reader-text{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(1px,1px,1px,1px);white-space:nowrap}
/* ---------- Top notice ---------- */
.ns-topbar{background:var(--blue);color:#fff;font-size:13px}
.ns-topbar .ns-wrap{display:flex;gap:16px;align-items:center;justify-content:space-between;padding-block:7px}
.ns-topbar a{color:#fff}
.ns-marquee{overflow:hidden;white-space:nowrap;flex:1;min-width:0}
.ns-marquee span{display:inline-block;padding-left:100%;animation:ns-marq 24s linear infinite;animation-delay:-9s}
@keyframes ns-marq{to{transform:translateX(-100%)}}
.ns-topbar__contact{display:flex;gap:14px;flex:none}
.ns-topbar__contact a{display:inline-flex;gap:5px;align-items:center}
.ns-topbar__contact .ns-ico{width:15px;height:15px}

/* ---------- Header ---------- */
.ns-header{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.admin-bar .ns-header{top:32px}
.ns-header .ns-wrap{display:flex;align-items:center;gap:24px;min-height:68px}
.ns-logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;color:var(--ink);letter-spacing:-.01em}
.ns-logo img{max-height:44px;width:auto}
.ns-logo__mark{width:36px;height:36px;border-radius:10px;background:var(--blue);color:#fff;display:grid;place-items:center;font-size:15px;font-weight:800}
.ns-logo b{color:var(--blue)}
.ns-nav{flex:1}
.ns-menu,.ns-nav ul{list-style:none;margin:0;padding:0;display:flex;gap:4px}
.ns-nav a{white-space:nowrap;display:block;padding:8px 12px;border-radius:8px;color:var(--ink);font-weight:500}
.ns-nav a:hover,.ns-nav .current-menu-item>a{background:var(--blue-50);color:var(--blue)}
.ns-user{display:flex;gap:8px;align-items:center}
.ns-wallet{display:flex;align-items:center;gap:8px;padding:6px 12px 6px 8px;border-radius:999px;background:var(--blue-50);color:var(--blue);font-weight:700;font-variant-numeric:tabular-nums}
.ns-wallet small{display:block;font-size:11px;font-weight:500;color:var(--muted);line-height:1}
.ns-burger{display:none;background:none;border:0;padding:8px;color:var(--ink);cursor:pointer}

/* ---------- Buttons ---------- */
.ns-btn{white-space:nowrap;display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:9px 16px;border-radius:10px;border:1px solid transparent;font:600 14px/1.2 var(--font);cursor:pointer;transition:background .15s,border-color .15s,color .15s}
.ns-btn--primary{background:var(--blue);color:#fff}
.ns-btn--primary:hover{background:var(--blue-600);color:#fff}
.ns-btn--ghost{background:var(--surface);border-color:var(--line);color:var(--ink)}
.ns-btn--ghost:hover{border-color:var(--blue);color:var(--blue)}
.ns-btn--lg{padding:13px 22px;font-size:16px;border-radius:12px}
.ns-btn--block{width:100%}
.ns-btn[disabled]{background:var(--line);color:var(--muted);cursor:not-allowed}

/* ---------- Hero ---------- */
.ns-hero{padding-block:28px 8px}
.ns-hero__grid{display:grid;grid-template-columns:1.4fr 1fr;gap:20px}
.ns-hero__main{background:linear-gradient(135deg,#1d5bd8 0%,#2f7bf0 100%);color:#fff;border-radius:18px;padding:32px;position:relative;overflow:hidden}
.ns-hero__main::after{content:"";position:absolute;right:-60px;bottom:-60px;width:240px;height:240px;border-radius:50%;border:36px solid rgba(255,255,255,.08)}
.ns-hero__main h1{font-size:clamp(24px,3.4vw,34px);font-weight:800;max-width:18ch}
.ns-hero__main p{opacity:.9;max-width:46ch;margin:10px 0 20px}
.ns-hero__main .ns-btn--ghost{background:rgba(255,255,255,.14);border-color:rgba(255,255,255,.3);color:#fff}
.ns-hero__cta{display:flex;gap:10px;flex-wrap:wrap}
.ns-hero__cta .ns-btn--primary{background:#fff;color:var(--blue)}
.ns-hero__stats{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.ns-stat{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:16px;display:flex;flex-direction:column;justify-content:center;gap:2px}
.ns-stat .ns-ico{color:var(--blue);width:22px;height:22px;margin-bottom:6px}
.ns-stat strong{font-size:22px;font-variant-numeric:tabular-nums}
.ns-stat span{color:var(--muted);font-size:13px}

/* ---------- Sections ---------- */
.ns-section{padding-block:28px}
.ns-section__head{display:flex;justify-content:space-between;align-items:end;gap:12px;margin-bottom:16px}
.ns-section__head h2{font-size:22px;font-weight:800}
.ns-section__head p{margin:2px 0 0;color:var(--muted);font-size:14px}

/* Category tiles */
.ns-cats{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.ns-cat{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;color:var(--ink);transition:transform .15s,box-shadow .15s}
.ns-cat:hover{transform:translateY(-2px);box-shadow:var(--shadow);color:var(--ink)}
.ns-cat__img{aspect-ratio:16/9;background:var(--surface-2);overflow:hidden}
.ns-cat__img img{width:100%;height:100%;object-fit:cover}
.ns-cat__body{padding:14px 16px;display:flex;justify-content:space-between;align-items:center;gap:10px}
.ns-cat__body h3{font-size:16px;font-weight:700;text-transform:uppercase;letter-spacing:.02em}
.ns-cat__meta{display:flex;gap:14px;color:var(--muted);font-size:13px;margin-top:2px}
.ns-cat__meta b{color:var(--ink);font-variant-numeric:tabular-nums}
.ns-cat__go{flex:none;width:36px;height:36px;border-radius:50%;background:var(--blue-50);color:var(--blue);display:grid;place-items:center;font-weight:700}

/* Nick cards */
.ns-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px}
.ns-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:box-shadow .15s,border-color .15s}
.ns-card:hover{box-shadow:var(--shadow);border-color:#c9d6ea}
.ns-card__img{position:relative;aspect-ratio:3/2;background:var(--surface-2)}
.ns-card__img img{width:100%;height:100%;object-fit:cover}
.ns-card__code{position:absolute;left:10px;top:10px;background:rgba(15,27,45,.78);color:#fff;font-size:12px;font-weight:700;padding:3px 8px;border-radius:6px;font-variant-numeric:tabular-nums}
.ns-card__img .ns-pill{position:absolute;right:10px;top:10px}
.ns-card__body{padding:12px 14px 14px;display:flex;flex-direction:column;gap:10px;flex:1}
.ns-attrs{display:grid;grid-template-columns:1fr 1fr;gap:6px 10px;font-size:13px;margin:0}
.ns-attrs div{display:flex;justify-content:space-between;gap:6px;border-bottom:1px dashed var(--line);padding-bottom:4px;min-width:0}
.ns-attrs dt{color:var(--muted)}
.ns-attrs dd{margin:0;font-weight:600;text-align:right;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ns-card__foot{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:auto}
.ns-price{font-size:19px;font-weight:800;color:var(--price);font-variant-numeric:tabular-nums;line-height:1.1}
.ns-price del{display:block;font-size:12px;font-weight:500;color:var(--muted)}
.ns-card.is-sold{opacity:.72}
.ns-card.is-sold .ns-card__img img{filter:grayscale(.8)}

.ns-pill{display:inline-block;font-size:11.5px;font-weight:700;padding:3px 8px;border-radius:999px;letter-spacing:.02em}
.ns-pill--available{background:var(--ok-bg);color:var(--ok)}
.ns-pill--deposit{background:var(--warn-bg);color:var(--warn)}
.ns-pill--sold{background:var(--bad-bg);color:var(--bad)}

/* ---------- Listing + filters ---------- */
.ns-page-head{padding-block:24px 4px}
.ns-page-head h1{font-size:26px;font-weight:800}
.ns-crumbs{font-size:13px;color:var(--muted);margin-bottom:6px}
.ns-crumbs a{color:var(--muted)}
.ns-listing{display:grid;grid-template-columns:260px 1fr;gap:20px;align-items:start;padding-block:16px 40px}
.ns-filter{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px;position:sticky;top:84px;display:flex;flex-direction:column;gap:12px}
.ns-filter h3{font-size:15px;display:flex;gap:8px;align-items:center}
.ns-field{display:flex;flex-direction:column;gap:5px}
.ns-field label{font-size:13px;font-weight:600;color:var(--muted)}
.ns-input,.ns-field select,.ns-field input{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:var(--surface);font:inherit;color:var(--ink)}
.ns-input:focus,.ns-field select:focus,.ns-field input:focus{border-color:var(--blue);outline:none;box-shadow:0 0 0 3px var(--blue-50)}
.ns-filter__actions{display:flex;gap:8px}
.ns-filter__actions .ns-btn{flex:1}
.ns-toolbar{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:14px;flex-wrap:wrap}
.ns-toolbar p{margin:0;color:var(--muted)}
.ns-toolbar select{padding:8px 10px;border:1px solid var(--line);border-radius:8px;font:inherit;background:var(--surface)}
.ns-filter-toggle{display:none}
.ns-empty{background:var(--surface);border:1px dashed var(--line);border-radius:var(--radius);padding:40px;text-align:center;color:var(--muted)}
.ns-pager{display:flex;gap:6px;justify-content:center;margin-top:24px;flex-wrap:wrap}
.ns-pager .page-numbers{min-width:38px;padding:8px 12px;border-radius:8px;background:var(--surface);border:1px solid var(--line);color:var(--ink);text-align:center}
.ns-pager .current{background:var(--blue);border-color:var(--blue);color:#fff}

/* ---------- Single nick ---------- */
.ns-single{display:grid;grid-template-columns:1.25fr 1fr;gap:24px;padding-block:16px 40px;align-items:start}
.ns-gallery{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:12px}
.ns-gallery__main{aspect-ratio:3/2;border-radius:10px;overflow:hidden;background:var(--surface-2)}
.ns-gallery__main img{width:100%;height:100%;object-fit:contain;background:#0f1b2d}
.ns-gallery__thumbs{display:flex;gap:8px;margin-top:10px;overflow-x:auto}
.ns-gallery__thumbs button{flex:none;width:76px;height:56px;padding:0;border:2px solid transparent;border-radius:8px;overflow:hidden;cursor:pointer;background:none}
.ns-gallery__thumbs button.is-active{border-color:var(--blue)}
.ns-gallery__thumbs img{width:100%;height:100%;object-fit:cover}
.ns-buybox{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px;display:flex;flex-direction:column;gap:16px;position:sticky;top:84px}
.ns-buybox__top{display:flex;justify-content:space-between;align-items:start;gap:10px}
.ns-buybox h1{font-size:22px;font-weight:800}
.ns-buybox .ns-price{font-size:30px}
.ns-specs{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:0}
.ns-specs div{background:var(--surface-2);border-radius:10px;padding:10px 12px}
.ns-specs dt{font-size:12px;color:var(--muted)}
.ns-specs dd{margin:0;font-weight:700}
.ns-buybox__note{font-size:13px;color:var(--muted);display:flex;gap:8px;align-items:start}
.ns-buybox__note .ns-ico{color:var(--ok);width:18px;height:18px;margin-top:2px}
.ns-balance-line{display:flex;justify-content:space-between;font-size:14px;padding:10px 12px;border-radius:10px;background:var(--blue-50)}
.ns-desc{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px;margin-top:16px}
.ns-desc h2{font-size:17px;margin-bottom:8px}

/* Confirm dialog */
.ns-modal{position:fixed;inset:0;background:rgba(15,27,45,.5);display:grid;place-items:center;padding:16px;z-index:100}
.ns-modal[hidden]{display:none}
.ns-modal__box{background:var(--surface);border-radius:16px;padding:22px;max-width:400px;width:100%;display:flex;flex-direction:column;gap:14px}
.ns-modal__box h3{font-size:18px}
.ns-modal__row{display:flex;justify-content:space-between;font-variant-numeric:tabular-nums}
.ns-modal__actions{display:flex;gap:10px}
.ns-modal__actions .ns-btn{flex:1}

/* ---------- Auth ---------- */
.ns-auth{max-width:440px;margin:40px auto;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:28px;display:flex;flex-direction:column;gap:14px}
.ns-auth h1{font-size:24px;font-weight:800}
.ns-auth p.sub{margin:-8px 0 4px;color:var(--muted)}
.ns-auth .alt{text-align:center;font-size:14px;color:var(--muted)}
.ns-check{display:flex;gap:8px;align-items:center;font-size:14px}
.ns-hp{position:absolute;left:-9999px}

/* ---------- Alerts ---------- */
.ns-alert{padding:12px 14px;border-radius:10px;margin:16px 0;font-weight:500}
.ns-alert--success{background:var(--ok-bg);color:var(--ok)}
.ns-alert--error{background:var(--bad-bg);color:var(--bad)}
.ns-alert a{text-decoration:underline;color:inherit}

/* ---------- Account / top-up ---------- */
.ns-account{display:grid;grid-template-columns:260px 1fr;gap:20px;padding-block:16px 40px;align-items:start}
.ns-side{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px;display:flex;flex-direction:column;gap:14px}
.ns-side__user{display:flex;gap:10px;align-items:center}
.ns-avatar{width:44px;height:44px;border-radius:50%;background:var(--blue);color:#fff;display:grid;place-items:center;font-weight:800;text-transform:uppercase}
.ns-side__bal{background:var(--blue-50);border-radius:10px;padding:12px}
.ns-side__bal span{font-size:12px;color:var(--muted)}
.ns-side__bal strong{display:block;font-size:22px;color:var(--blue);font-variant-numeric:tabular-nums}
.ns-side nav{display:flex;flex-direction:column;gap:2px}
.ns-side nav a{padding:9px 10px;border-radius:8px;color:var(--ink);font-weight:500}
.ns-side nav a.is-active,.ns-side nav a:hover{background:var(--blue-50);color:var(--blue)}
.ns-panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px;min-width:0}
.ns-panel h2{font-size:19px;margin-bottom:14px}
.ns-table-wrap{overflow-x:auto}
.ns-table{width:100%;border-collapse:collapse;font-size:14px;font-variant-numeric:tabular-nums}
.ns-table th,.ns-table td{padding:10px;border-bottom:1px solid var(--line);text-align:left;white-space:nowrap}
.ns-table th{font-size:12px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);font-weight:600}
.ns-plus{color:var(--ok);font-weight:700}
.ns-minus{color:var(--bad);font-weight:700}
.ns-owned{border:1px solid var(--line);border-radius:12px;padding:14px;display:grid;grid-template-columns:120px 1fr;gap:14px;margin-bottom:12px}
.ns-owned:target{border-color:var(--blue);box-shadow:0 0 0 3px var(--blue-50)}
.ns-owned img{border-radius:8px;aspect-ratio:3/2;object-fit:cover;width:100%}
.ns-cred{display:grid;grid-template-columns:auto 1fr auto;gap:6px 10px;align-items:center;margin-top:8px;font-size:14px}
.ns-cred code{background:var(--surface-2);padding:4px 8px;border-radius:6px;font-size:14px;overflow-wrap:anywhere}
.ns-copy{background:none;border:1px solid var(--line);border-radius:6px;padding:4px 6px;cursor:pointer;color:var(--muted);display:inline-flex}
.ns-copy:hover{color:var(--blue);border-color:var(--blue)}
.ns-tabs{display:flex;gap:6px;margin-bottom:16px;flex-wrap:wrap}
.ns-tabs a{padding:9px 14px;border-radius:10px;border:1px solid var(--line);color:var(--ink);font-weight:600;background:var(--surface)}
.ns-tabs a.is-active{background:var(--blue);border-color:var(--blue);color:#fff}
.ns-topup{display:grid;grid-template-columns:260px 1fr;gap:20px;align-items:start}
.ns-qr{background:var(--surface-2);border-radius:12px;padding:12px;text-align:center}
.ns-qr img{margin:0 auto;border-radius:8px;background:#fff}
.ns-kv{display:grid;grid-template-columns:auto 1fr auto;gap:8px 12px;align-items:center;margin:0}
.ns-kv dt{color:var(--muted);font-size:14px}
.ns-kv dd{margin:0;font-weight:700;overflow-wrap:anywhere}
.ns-kv dd.hl{color:var(--price);font-size:18px}
.ns-steps{margin:16px 0 0;padding-left:20px;color:var(--muted);font-size:14px}
.ns-live{display:flex;gap:8px;align-items:center;font-size:13px;color:var(--muted);margin-top:12px}
.ns-live i{width:8px;height:8px;border-radius:50%;background:var(--ok);animation:ns-pulse 1.4s infinite}
@keyframes ns-pulse{50%{opacity:.3}}
.ns-form-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}

/* ---------- About + footer ---------- */
.ns-about{display:grid;grid-template-columns:1.2fr 1fr;gap:20px}
.ns-about__text{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.ns-about__text h2{font-size:20px;margin-bottom:8px}
.ns-about__text p{color:var(--muted);margin:0}
.ns-features{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.ns-feature{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px}
.ns-feature .ns-ico{color:var(--blue)}
.ns-feature h3{font-size:15px;margin:6px 0 2px}
.ns-feature p{margin:0;font-size:13px;color:var(--muted)}
.ns-footer{background:#0f1b2d;color:#b8c4d6;margin-top:24px;font-size:14px}
.ns-footer .ns-wrap{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:28px;padding-block:36px}
.ns-footer h4{color:#fff;font-size:15px;margin:0 0 10px}
.ns-footer a{color:#b8c4d6}
.ns-footer a:hover{color:#fff}
.ns-footer ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:6px}
.ns-footer__bottom{border-top:1px solid rgba(255,255,255,.08);text-align:center;padding:14px 16px;font-size:13px}
.ns-float{position:fixed;right:16px;bottom:calc(16px + env(safe-area-inset-bottom,0px));display:flex;flex-direction:column;gap:10px;z-index:60}
.ns-float a{width:50px;height:50px;border-radius:50%;display:grid;place-items:center;color:#fff;box-shadow:var(--shadow);font-weight:800;font-size:13px}
.ns-float .zalo{background:#0068ff}
.ns-float .fb{background:#1877f2}

/* ---------- Responsive ---------- */
@media (max-width:960px){
  .ns-hero__grid,.ns-single,.ns-about{grid-template-columns:1fr}
  .ns-listing,.ns-account,.ns-topup{grid-template-columns:1fr}
  .ns-filter{position:static;display:none}
  .ns-filter.is-open{display:flex}
  .ns-filter-toggle{display:inline-flex}
  .ns-buybox{position:static}
  .ns-footer .ns-wrap{grid-template-columns:1fr 1fr}
}
@media (max-width:1024px){.ns-burger{display:block}.ns-nav{position:absolute;left:0;right:0;top:100%;background:var(--surface);border-bottom:1px solid var(--line);display:none;padding:8px 16px}.ns-nav.is-open{display:block}.ns-nav ul,.ns-menu{flex-direction:column}.ns-logo{flex:1}}
@media (max-width:760px){
  .ns-burger{display:block}
  .ns-nav{position:absolute;left:0;right:0;top:100%;background:var(--surface);border-bottom:1px solid var(--line);display:none;padding:8px 16px}
  .ns-nav.is-open{display:block}
  .ns-nav ul,.ns-menu{flex-direction:column}
  .ns-header .ns-wrap{gap:10px}
  .ns-logo{flex:1;font-size:16px}
  .ns-user .ns-btn--ghost{display:none}
  .ns-topbar__contact{display:none}
  .ns-grid{grid-template-columns:1fr 1fr;gap:10px}
  .ns-card__body{padding:10px}
  .ns-attrs{grid-template-columns:1fr}
  .ns-card__foot{flex-direction:column;align-items:stretch}
  .ns-price{font-size:17px}
  .ns-footer .ns-wrap{grid-template-columns:1fr}
  .ns-owned{grid-template-columns:1fr}
  .ns-form-grid,.ns-features{grid-template-columns:1fr}
  .ns-hero__main{padding:22px}
  .ns-float a{width:42px;height:42px;font-size:11px}
  .ns-user .ns-btn--primary{padding:8px 12px}
  .ns-wallet small{display:none}
}
@media (max-width:782px){.admin-bar .ns-header{top:46px}}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}