/* Personal Library — reading/library app (demo by vPage.vn) */
:root{
  --c:#5b4cf0;--c2:#8b7cff;--accent:#f59e0b;--ink:#171633;--bg:#ffffff;--bg2:#f5f4ff;
  --line:#e9e7f6;--muted:#5f6386;--paper:#fbfaf5;
  --r:16px;--rl:24px;--maxw:1180px;
  --sh:0 22px 54px rgba(23,22,51,.10);--sh-xs:0 1px 3px rgba(23,22,51,.05);--glow:0 14px 34px rgba(91,76,240,.3);
  --grad:linear-gradient(135deg,var(--c),var(--c2));
  --fh:"Sora",system-ui,sans-serif;--ff:"Be Vietnam Pro",system-ui,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{font-family:var(--ff);background:var(--bg);color:var(--ink);line-height:1.78;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;display:block}a{text-decoration:none;color:inherit}ul{list-style:none}
h1,h2,h3{font-family:var(--fh);font-weight:700;line-height:1.14;letter-spacing:-.02em;color:var(--ink)}
.container{max-width:var(--maxw);margin:0 auto;padding:0 26px}
.section{padding:104px 0;position:relative}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--c);background:rgba(91,76,240,.08);border:1px solid var(--line);padding:6px 14px;border-radius:999px;margin-bottom:18px}
.head{text-align:center;max-width:680px;margin:0 auto 60px}.head h2{font-size:clamp(30px,4.4vw,46px);margin-bottom:14px}.head p{color:var(--muted);font-size:17px}
.btn{display:inline-flex;align-items:center;gap:9px;font-weight:600;font-size:15px;padding:14px 30px;border-radius:12px;border:none;cursor:pointer;transition:transform .2s,box-shadow .2s,background .2s,color .2s}
.btn-primary{background:var(--grad);color:#fff;box-shadow:var(--glow)}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 42px rgba(91,76,240,.42)}
.btn-ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}.btn-ghost:hover{border-color:var(--c);transform:translateY(-2px)}
.reveal{opacity:0;transform:translateY(28px);transition:opacity .8s cubic-bezier(.2,.7,.2,1),transform .8s cubic-bezier(.2,.7,.2,1)}.reveal.in{opacity:1;transform:none}
.header{position:sticky;top:0;z-index:100;backdrop-filter:saturate(160%) blur(12px);background:rgba(255,255,255,.82);border-bottom:1px solid transparent;transition:.3s}
.header.scrolled{border-bottom-color:var(--line);box-shadow:0 6px 24px rgba(23,22,51,.06)}
.nav{display:flex;align-items:center;justify-content:space-between;height:74px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--fh);font-weight:800;font-size:20px;color:var(--ink)}
.brand .dot{width:36px;height:36px;border-radius:11px;background:var(--grad);display:grid;place-items:center;color:#fff;box-shadow:var(--glow)}
.menu{display:flex;align-items:center;gap:30px}.menu a{color:var(--muted);font-weight:600;font-size:15px;transition:color .2s}.menu a:hover{color:var(--c)}
.nav-r{display:flex;align-items:center;gap:12px}
.burger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px}.burger span{width:24px;height:2px;background:var(--ink);border-radius:2px}
@media(max-width:920px){.menu{display:none;position:absolute;top:74px;left:18px;right:18px;flex-direction:column;background:#fff;padding:14px 22px;gap:0;border-radius:var(--r);box-shadow:var(--sh)}.menu.open{display:flex}.menu a{padding:13px 0;border-bottom:1px solid var(--line);width:100%}.burger{display:flex}.nav-r .btn{display:none}}
/* hero */
.hero{position:relative;overflow:hidden;background:linear-gradient(180deg,var(--bg2),#fff)}
.hero::before{content:"";position:absolute;width:640px;height:640px;right:-200px;top:-260px;border-radius:50%;background:radial-gradient(circle,rgba(91,76,240,.16),transparent 62%)}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;padding:84px 0;position:relative;z-index:2}
.hero h1{font-size:clamp(38px,5.6vw,62px);margin-bottom:20px}
.hero p{font-size:18px;color:var(--muted);max-width:480px;margin-bottom:32px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.hero-media{position:relative}.hero-media img{width:100%;aspect-ratio:4/3.4;object-fit:cover;border-radius:var(--rl);box-shadow:var(--sh)}
.hero-media .pill{position:absolute;bottom:-18px;left:-18px;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:var(--sh);padding:14px 18px;display:flex;align-items:center;gap:12px}
.hero-media .pill .ic{width:40px;height:40px;border-radius:10px;background:rgba(91,76,240,.12);color:var(--c);display:grid;place-items:center}
.hero-media .pill b{display:block;font-size:14px}.hero-media .pill span{font-size:12px;color:var(--muted)}
@media(max-width:920px){.hero-grid{grid-template-columns:1fr;padding:56px 0}.hero-media{max-width:460px;margin:0 auto}}
/* stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}@media(max-width:760px){.stats{grid-template-columns:repeat(2,1fr)}}
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:26px;text-align:center;box-shadow:var(--sh-xs)}
.stat b{font-family:var(--fh);font-size:34px;display:block;line-height:1}.stat span{color:var(--muted);font-size:14px;margin-top:6px;display:block}
/* features */
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}@media(max-width:900px){.grid3{grid-template-columns:1fr}}
.feat{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:32px;transition:transform .25s,box-shadow .25s,border-color .25s}
.feat:hover{transform:translateY(-6px);box-shadow:var(--sh);border-color:transparent}
.feat .ic{width:56px;height:56px;border-radius:15px;background:rgba(91,76,240,.1);display:grid;place-items:center;color:var(--c);margin-bottom:18px}
.feat h3{font-size:20px;margin-bottom:10px}.feat p{color:var(--muted);font-size:14.5px}
/* about */
.about{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}@media(max-width:900px){.about{grid-template-columns:1fr;gap:44px}}
.about-media{border-radius:var(--rl);overflow:hidden;box-shadow:var(--sh);aspect-ratio:4/3.2}.about-media img{width:100%;height:100%;object-fit:cover}
.about h2{font-size:clamp(28px,4vw,42px);margin-bottom:18px}.about p{color:var(--muted);margin-bottom:14px}
.chk{display:flex;flex-direction:column;gap:13px;margin-top:18px}.chk li{display:flex;align-items:flex-start;gap:11px}.chk svg{color:var(--c);flex-shrink:0;margin-top:3px}
/* steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;counter-reset:s}@media(max-width:900px){.steps{grid-template-columns:1fr}}
.step{background:var(--paper);border:1px solid var(--line);border-radius:var(--r);padding:30px}
.step::before{counter-increment:s;content:"0" counter(s);font-family:var(--fh);font-weight:800;font-size:28px;color:var(--c);display:block;margin-bottom:10px}
.step h3{font-size:18px;margin-bottom:8px}.step p{color:var(--muted);font-size:14.5px}
/* testimonials */
.testi-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}@media(max-width:900px){.testi-grid{grid-template-columns:1fr}}
.testi{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:30px;box-shadow:var(--sh-xs)}.testi .stars{color:var(--accent);letter-spacing:2px;margin-bottom:12px}.testi p{margin-bottom:18px}
.testi .who{display:flex;align-items:center;gap:12px}.testi .av{width:46px;height:46px;border-radius:50%;background:var(--grad);color:#fff;display:grid;place-items:center;font-weight:700}.testi .who b{display:block}.testi .who small{color:var(--muted)}
/* cta */
.cta-band{position:relative;overflow:hidden;background:var(--grad);border-radius:var(--rl);padding:64px 40px;text-align:center;color:#fff;box-shadow:var(--glow)}
.cta-band::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 25% 20%,rgba(255,255,255,.22),transparent 50%)}
.cta-band h2{position:relative;color:#fff;font-size:clamp(28px,4vw,44px);margin-bottom:14px}.cta-band p{position:relative;opacity:.92;font-size:18px;margin-bottom:28px}.cta-band .btn{background:#fff;color:var(--c)}
/* footer */
.footer{border-top:1px solid var(--line);padding:60px 0 30px;background:var(--bg2)}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.2fr;gap:40px;margin-bottom:40px}@media(max-width:900px){.footer-grid{grid-template-columns:1fr 1fr}}@media(max-width:560px){.footer-grid{grid-template-columns:1fr}}
.footer h4{font-size:13px;letter-spacing:.08em;text-transform:uppercase;margin-bottom:16px}.footer a{color:var(--muted);display:block;margin-bottom:10px}.footer a:hover{color:var(--c)}
.footer-bot{border-top:1px solid var(--line);padding-top:24px;text-align:center;color:var(--muted);font-size:14px}
.vpage-badge{position:fixed;bottom:18px;left:18px;background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 14px;font-size:12px;color:var(--muted);box-shadow:var(--sh-xs);z-index:90}.vpage-badge b{color:var(--c)}
.vpage-cta{position:fixed;bottom:18px;right:18px;z-index:90;background:linear-gradient(135deg,#5b4cf0,#0bb5d6);color:#fff;font-weight:700;font-size:14px;padding:12px 20px;border-radius:999px;box-shadow:0 12px 28px rgba(91,76,240,.4);transition:transform .2s}.vpage-cta:hover{transform:translateY(-2px)}
@media(max-width:560px){.vpage-badge{display:none}.vpage-cta{bottom:14px;right:14px;font-size:13px;padding:10px 16px}}