:root{
  --ink:#16181d; --muted:#5d6370; --line:rgba(22,24,29,.10); --bg:#f7f7f5; --card:#fff;
  --accent:#3b5bdb; --accent2:#7048e8;
  --grad:linear-gradient(135deg,var(--accent),var(--accent2));
  --uptend:linear-gradient(135deg,#0a4540,#128073 55%,#1c849e);
  --sweepvault:linear-gradient(135deg,#3a0d1e,#5c1a33 55%,#b23a64);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{line-height:1.15;letter-spacing:-.02em}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px}
.nav{display:flex;align-items:center;justify-content:space-between;max-width:1080px;margin:0 auto;padding:18px 24px}
.brand{display:flex;align-items:center;gap:10px;font-weight:750;font-size:20px;color:var(--ink)}
.brand:hover{text-decoration:none}
.logo{width:34px;height:34px;border-radius:10px;background:var(--grad);display:grid;place-items:center;color:#fff;font-weight:800;font-size:15px;letter-spacing:-.04em}
.nav nav{display:flex;gap:24px}
.nav nav a{color:var(--muted);font-weight:500}
.hero{padding:80px 0 56px;text-align:center;background:radial-gradient(900px 420px at 50% -20%,rgba(112,72,232,.14),transparent)}
.hero h1{font-size:clamp(34px,6vw,60px);margin:0 0 18px}
.hero h1 em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{font-size:clamp(17px,2.2vw,21px);color:var(--muted);max-width:700px;margin:0 auto}
.badges{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:26px}
.badges span{font-size:14px;background:var(--card);border:1px solid var(--line);border-radius:999px;padding:6px 14px;color:var(--muted)}
section{padding:56px 0}
h2{font-size:clamp(26px,4vw,36px);margin:0 0 30px;text-align:center}
.apps{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:26px}
.app{background:var(--card);border:1px solid var(--line);border-radius:22px;overflow:hidden;display:flex;flex-direction:column;transition:transform .15s,box-shadow .2s;color:var(--ink)}
.app:hover{transform:translateY(-3px);box-shadow:0 18px 44px rgba(22,24,29,.12);text-decoration:none}
.app .shot{aspect-ratio:16/10;background-size:cover;background-position:center}
.app .body{padding:24px 26px 28px;display:flex;gap:18px;align-items:flex-start}
.app .icon{width:64px;height:64px;border-radius:15px;flex:none;box-shadow:0 6px 16px rgba(0,0,0,.15)}
.app h3{margin:0 0 4px;font-size:22px}
.app p{margin:0 0 12px;color:var(--muted)}
.app .meta{font-size:14px;font-weight:600}
.app.uptend .meta{color:#128073}
.app.sweepvault .meta{color:#b23a64}
.app.soon{border-style:dashed;justify-content:center;align-items:center;text-align:center;padding:40px;color:var(--muted);min-height:220px}
.why{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px}
.why article{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:24px}
.why h3{margin:0 0 6px;font-size:18px}
.why p{margin:0;color:var(--muted)}
.posts{max-width:760px;margin:0 auto;display:grid;gap:14px}
.posts a{display:block;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px 22px;color:var(--ink)}
.posts a span{display:block;color:var(--muted);font-size:14px}
.doc{max-width:760px;margin:0 auto;padding:30px 24px 70px}
.doc h1{font-size:clamp(30px,5vw,44px);margin:10px 0 8px}
.doc h2{text-align:left;font-size:24px;margin:34px 0 10px}
.doc .date{color:var(--muted);font-size:14px}
footer{border-top:1px solid var(--line);padding:34px 24px 44px;text-align:center;color:var(--muted);font-size:14px}
footer nav{display:flex;gap:18px;justify-content:center;flex-wrap:wrap;margin-bottom:12px}
footer a{color:var(--muted)}
.tm{font-size:12px;opacity:.8;max-width:700px;margin:10px auto 0}
@media(max-width:600px){.nav nav{gap:14px}.nav nav a.hide-sm{display:none}}
section.wrap{padding-top:56px;padding-bottom:56px}

/* === Gradient theme (13/11, anh yêu cầu nền gradient) === */
body{background:linear-gradient(180deg,#eef0ff 0%,#f6f0ff 35%,#fff4f8 70%,#f0f7ff 100%);background-attachment:fixed}
.nav{position:relative;z-index:2}
body>header.nav{max-width:none;padding:18px max(24px,calc((100% - 1032px)/2));background:linear-gradient(120deg,#1e2a78,#3b5bdb 45%,#7048e8 75%,#c2255c);margin:0}
body>header.nav .brand,body>header.nav nav a{color:#fff}
body>header.nav .logo{background:rgba(255,255,255,.18);box-shadow:inset 0 0 0 1px rgba(255,255,255,.35)}
.hero{color:#fff;padding:90px 0 110px;background:
  radial-gradient(700px 380px at 15% 20%,rgba(255,146,200,.45),transparent 60%),
  radial-gradient(800px 420px at 85% 0%,rgba(99,230,255,.35),transparent 60%),
  linear-gradient(120deg,#1e2a78,#3b5bdb 45%,#7048e8 75%,#c2255c)}
.hero h1 em{background:linear-gradient(90deg,#ffd43b,#ff8787,#f783ac);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lead{color:rgba(255,255,255,.88)}
.badges span{background:rgba(255,255,255,.14);border-color:rgba(255,255,255,.3);color:#fff;backdrop-filter:blur(6px)}
#apps{margin-top:-70px;position:relative}
#apps h2{color:#fff;text-shadow:0 2px 12px rgba(0,0,0,.25)}
.app{box-shadow:0 18px 50px rgba(59,91,219,.18)}
.app.soon{background:linear-gradient(135deg,rgba(255,255,255,.7),rgba(240,235,255,.9));border:1.5px dashed rgba(112,72,232,.35)}
.why article{background:linear-gradient(160deg,#fff,#f4f0ff);border-color:rgba(112,72,232,.15)}
.why article:nth-child(2){background:linear-gradient(160deg,#fff,#eef6ff)}
.why article:nth-child(3){background:linear-gradient(160deg,#fff,#fff0f6)}
.why article:nth-child(4){background:linear-gradient(160deg,#fff,#effbf5)}
.posts a{background:linear-gradient(120deg,#fff,#f6f2ff)}
h2{background:linear-gradient(90deg,#1e2a78,#7048e8,#c2255c);-webkit-background-clip:text;background-clip:text;color:transparent}
#apps h2{background:none;-webkit-background-clip:initial;background-clip:initial}
.doc{background:rgba(255,255,255,.75);border-radius:22px;margin-top:34px;margin-bottom:50px;box-shadow:0 14px 40px rgba(59,91,219,.10)}
.doc h2{background:none;color:var(--ink)}
footer{border:0;color:rgba(255,255,255,.75);background:linear-gradient(120deg,#141a4d,#2b2f8f 50%,#5a2a8a)}
footer a{color:rgba(255,255,255,.85)}
.hero{padding-bottom:190px}#apps{margin-top:-150px;padding-top:0}#apps h2{margin-bottom:34px}
.app.soon{background:linear-gradient(160deg,#ffffff,#f3eeff)}
/* === Nền gradient TOÀN TRANG (anh: nền vẫn trắng) === */
body{background:linear-gradient(160deg,#1e2a78 0%,#3b5bdb 28%,#7048e8 58%,#c2255c 100%) fixed;color:var(--ink)}
.hero{background:radial-gradient(700px 380px at 15% 20%,rgba(255,146,200,.35),transparent 60%),radial-gradient(800px 420px at 85% 0%,rgba(99,230,255,.30),transparent 60%)}
body>header.nav{background:rgba(20,26,77,.35);backdrop-filter:blur(10px)}
h2,#apps h2{background:none;-webkit-background-clip:initial;background-clip:initial;color:#fff;text-shadow:0 2px 14px rgba(0,0,0,.2)}
.app.soon{background:rgba(255,255,255,.14);border:1.5px dashed rgba(255,255,255,.5);color:#fff}
.app.soon h3{color:#fff}.app.soon p{color:rgba(255,255,255,.85)}
.why article,.why article:nth-child(n){background:rgba(255,255,255,.95)}
footer{background:rgba(10,12,40,.35)}
.doc{background:#fff}