/* WinkSocks site — indigo/violet, Apple fonts */
:root{
  --pri:#5b3df5; --pri2:#8b5cf6; --pri-d:#4c34d6; --pri-t:#efeafe;
  --ink:#12122b; --body:#3d4363; --mut:#6b7192; --line:#e9e9f3; --soft:#f6f6fc;
  --bg:#ffffff; --navy:#0b0b23; --navy2:#171739; --ok:#12b981; --warn:#f59e0b;
  --grad:linear-gradient(120deg,#6d4bff 0%,#9a5cf6 100%);
  --shadow:0 18px 50px -20px rgba(60,40,160,.35); --r:18px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--body);
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","SF Pro Display","Segoe UI",Inter,system-ui,sans-serif;
  -webkit-font-smoothing:antialiased;line-height:1.65;letter-spacing:-.011em}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
h1,h2,h3{color:var(--ink);letter-spacing:-.025em;line-height:1.14;margin:0;text-wrap:balance}
h1{font-size:clamp(2rem,4.6vw,3.5rem);font-weight:800}
h2{font-size:clamp(1.55rem,2.9vw,2.2rem);font-weight:800}
h3{font-size:1.18rem;font-weight:700;letter-spacing:-.015em}
p{margin:0}
.wrap{max-width:1160px;margin:0 auto;padding:0 22px}
.grad-txt{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:.82rem;font-weight:700;color:var(--pri);
  background:var(--pri-t);padding:6px 13px;border-radius:100px;letter-spacing:.02em}
.sec{padding:clamp(50px,7vw,86px) 0}
.sec-head{max-width:680px;margin:0 auto clamp(32px,4.5vw,48px);text-align:center}
.sec-head .eyebrow{margin-bottom:15px}
.sec-head p{margin-top:15px;color:var(--mut);font-size:1.02rem;max-width:52ch;margin-left:auto;margin-right:auto}
/* buttons */
.btn{display:inline-flex;align-items:center;gap:9px;font-weight:700;font-size:.98rem;
  padding:13px 24px;border-radius:12px;border:1px solid transparent;cursor:pointer;transition:.18s;white-space:nowrap}
.btn.pri{background:var(--grad);color:#fff;box-shadow:0 10px 26px -10px rgba(109,75,255,.7)}
.btn.pri:hover{transform:translateY(-2px);box-shadow:0 16px 34px -10px rgba(109,75,255,.75)}
.btn.ghost{background:#fff;border-color:var(--line);color:var(--ink)}
.btn.ghost:hover{border-color:var(--pri);color:var(--pri)}
.btn.light{background:rgba(255,255,255,.12);color:#fff;border-color:rgba(255,255,255,.22)}
.btn.light:hover{background:rgba(255,255,255,.2)}
.btn.lg{padding:16px 30px;font-size:1.05rem}
/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.82);backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;gap:22px;height:66px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--ink);font-size:1.22rem;letter-spacing:-.03em}
.brand .mk{width:34px;height:34px;border-radius:9px;background:var(--grad);display:grid;place-items:center;color:#fff;box-shadow:0 6px 16px -6px rgba(109,75,255,.8)}
.nav .links{display:flex;gap:26px;margin-left:14px}
.nav .links a{font-size:.95rem;font-weight:600;color:var(--body)}
.nav .links a:hover{color:var(--pri)}
.nav .sp{flex:1}
.nav .burger{display:none;background:none;border:0;cursor:pointer;color:var(--ink)}
/* hero */
.hero{background:radial-gradient(1200px 600px at 80% -10%,#2a1e6e 0,transparent 60%),linear-gradient(160deg,#0b0b23 0%,#191046 100%);color:#fff;overflow:hidden;position:relative}
.hero:after{content:"";position:absolute;inset:0;background:radial-gradient(700px 380px at 15% 110%,rgba(139,92,246,.28),transparent 60%)}
.hero .wrap{position:relative;z-index:2;display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center;padding-top:clamp(46px,7vw,84px);padding-bottom:clamp(46px,7vw,84px)}
.hero h1{color:#fff}
.hero .sub{margin-top:20px;font-size:1.16rem;color:#c9caf0;max-width:560px}
.hero .eyebrow{background:rgba(139,92,246,.16);color:#c4b3ff}
.hero .cta{display:flex;gap:14px;margin-top:32px;flex-wrap:wrap}
.hero .stats{display:flex;gap:0;margin-top:40px;flex-wrap:wrap}
.hero .stats>div{padding-right:34px;margin-right:34px;position:relative}
.hero .stats>div:not(:last-child):after{content:"";position:absolute;right:0;top:8px;bottom:6px;width:1px;background:rgba(255,255,255,.15)}
.hero .stats .n{font-size:1.9rem;font-weight:800;color:#fff;letter-spacing:-.02em}
.hero .stats .l{font-size:.86rem;color:#9fa2d4;margin-top:2px}
/* trust strip */
.trust{padding:20px 0;border-bottom:1px solid var(--line);background:var(--soft)}
.trust-in{display:flex;align-items:center;justify-content:center;gap:14px 18px;flex-wrap:wrap}
.trust-lead{color:var(--mut);font-weight:600;font-size:.95rem}
.protos{display:flex;gap:9px;flex-wrap:wrap;justify-content:center}
.proto{background:#fff;border:1px solid var(--line);border-radius:100px;padding:6px 15px;font-weight:700;font-size:.84rem;color:var(--pri)}
.hero .art img{border-radius:20px;box-shadow:0 40px 90px -30px rgba(0,0,0,.7)}
/* cards / grids */
.grid{display:grid;gap:20px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:26px;transition:.2s}
.card:hover{border-color:#d6d2f7;box-shadow:var(--shadow);transform:translateY(-3px)}
.ic{width:46px;height:46px;border-radius:12px;background:var(--pri-t);color:var(--pri);display:grid;place-items:center;margin-bottom:16px}
.ic svg{width:24px;height:24px}
.card h3{margin-bottom:8px}
.card p{color:var(--mut);font-size:.96rem}
/* centered content for Tính năng + Vì sao chọn cards */
#features .card,#why .card{text-align:center;display:flex;flex-direction:column;align-items:center}
#features .card .ic{margin-left:auto;margin-right:auto}
#why .card{justify-content:center}
/* split feature */
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(30px,5vw,64px);align-items:center}
.split.rev .txt{order:2}
.split .art{background:var(--soft);border-radius:22px;padding:26px;border:1px solid var(--line)}
.split ul{list-style:none;padding:0;margin:20px 0 0;display:grid;gap:12px}
.split li{display:flex;gap:11px;align-items:flex-start;color:var(--body)}
.split li svg{width:22px;height:22px;color:var(--ok);flex:none;margin-top:2px}
.soft{background:var(--soft)}
/* pricing */
.prices{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;max-width:820px;margin:0 auto}
.price{background:#fff;border:1.5px solid var(--line);border-radius:22px;padding:32px;position:relative}
.price.hot{border-color:var(--pri);box-shadow:var(--shadow)}
.price .tag{position:absolute;top:-13px;left:32px;background:var(--grad);color:#fff;font-size:.76rem;font-weight:700;padding:5px 13px;border-radius:100px}
.price .pname{font-weight:700;color:var(--ink);font-size:1.15rem}
.price .amt{font-size:2.6rem;font-weight:800;color:var(--ink);margin:10px 0 2px;letter-spacing:-.03em}
.price .amt small{font-size:1rem;font-weight:600;color:var(--mut)}
.price .per{color:var(--mut);font-size:.92rem}
.price ul{list-style:none;padding:0;margin:22px 0;display:grid;gap:12px}
.price li{display:flex;gap:10px;align-items:flex-start;font-size:.96rem}
.price li svg{width:20px;height:20px;color:var(--pri);flex:none;margin-top:2px}
.price .btn{width:100%;justify-content:center}
/* steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;counter-reset:s}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:26px;position:relative}
.step .num{width:38px;height:38px;border-radius:10px;background:var(--grad);color:#fff;font-weight:800;display:grid;place-items:center;margin-bottom:14px}
/* devices chips */
.chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.chip{background:#fff;border:1px solid var(--line);border-radius:100px;padding:8px 16px;font-size:.9rem;font-weight:600;color:var(--body)}
.chip b{color:var(--pri)}
/* device cards */
.g4{grid-template-columns:repeat(4,1fr)}
.devc{text-align:left;display:flex;flex-direction:column}
.devc .devimg{background:var(--soft);border-radius:12px;padding:12px;margin-bottom:14px}
.devc .devimg img{width:100%;aspect-ratio:1/1;object-fit:contain;border-radius:8px}
.devc h3{font-size:1.05rem}
.devc .devmeta{color:var(--mut);font-size:.84rem;margin-top:5px}
.devc .devtag{display:inline-block;font-size:.72rem;font-weight:700;color:var(--pri);background:var(--pri-t);padding:3px 9px;border-radius:100px;margin-top:10px;align-self:flex-start}
.devc .devload{margin-top:auto;padding-top:12px;border-top:1px solid var(--line2);font-size:.9rem;color:var(--body);display:grid;gap:4px}
.devc .devload b{color:var(--pri);font-size:1.02rem}
.devc .devload .lbl{color:var(--mut);font-size:.8rem}
.opt{position:relative}
.opt.hot{border-color:var(--pri);box-shadow:var(--shadow)}
.opt .badge{position:absolute;top:-12px;left:24px;background:var(--grad);color:#fff;font-size:.72rem;font-weight:700;padding:4px 12px;border-radius:100px}
@media(max-width:900px){.g4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.g4{grid-template-columns:1fr}}
/* devices hero table */
.devtbl{width:100%;border-collapse:collapse;margin:20px 0;font-size:.92rem}
.devtbl th,.devtbl td{border-bottom:1px solid var(--line);padding:12px 12px;text-align:left;vertical-align:middle}
.devtbl th{color:var(--mut);font-weight:700;font-size:.82rem;text-transform:uppercase;letter-spacing:.03em}
.devtbl td b{color:var(--ink)}
.devtbl .load{color:var(--pri);font-weight:700;white-space:nowrap}
.devtbl-wrap{overflow-x:auto}
/* faq */
.faq{max-width:820px;margin:0 auto}
.qa{border:1px solid var(--line);border-radius:14px;padding:18px 22px;margin-bottom:12px;background:#fff}
.qa summary{font-weight:700;color:var(--ink);cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:12px}
.qa summary::-webkit-details-marker{display:none}
.qa summary:after{content:"+";color:var(--pri);font-size:1.4rem;line-height:1}
.qa[open] summary:after{content:"–"}
.qa p{margin-top:12px;color:var(--mut)}
/* cta band */
.ctaband{background:var(--grad);border-radius:26px;padding:clamp(34px,5vw,56px);text-align:center;color:#fff;box-shadow:var(--shadow)}
.ctaband h2{color:#fff}
.ctaband p{color:#e7e0ff;margin:12px auto 26px;max-width:560px}
/* footer */
.foot{background:var(--navy);color:#b9bce6;padding:56px 0 30px;margin-top:0}
.foot .cols{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:30px}
.foot h4{color:#fff;font-size:.92rem;text-transform:uppercase;letter-spacing:.06em;margin:0 0 14px}
.foot a{display:block;color:#9a9ec9;font-size:.94rem;padding:5px 0}
.foot a:hover{color:#fff}
.foot .brand{color:#fff}
.foot .brand .mk{box-shadow:none}
.foot .bottom{border-top:1px solid #23234a;margin-top:36px;padding-top:22px;font-size:.86rem;color:#7c80ad;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}
/* docs */
.doc{display:grid;grid-template-columns:250px 1fr;gap:40px;align-items:start;padding:40px 0 80px}
.doc-nav{position:sticky;top:86px}
.doc-nav h4{font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:var(--mut);margin:22px 0 8px}
.doc-nav a{display:block;padding:7px 12px;border-radius:8px;font-size:.94rem;color:var(--body);font-weight:500}
.doc-nav a:hover{background:var(--soft);color:var(--pri)}
.doc-nav a.on{background:var(--pri-t);color:var(--pri);font-weight:700}
.doc-body{max-width:760px;min-width:0}
.doc-body h1{margin-bottom:8px}
.doc-body h2{font-size:1.5rem;margin:38px 0 12px;padding-top:8px}
.doc-body h3{margin:26px 0 8px}
.doc-body p{margin:12px 0;color:var(--body)}
.doc-body ul,.doc-body ol{margin:12px 0;padding-left:22px;color:var(--body)}
.doc-body li{margin:7px 0}
.doc-body img{border:1px solid var(--line);border-radius:12px;margin:18px 0;box-shadow:var(--shadow)}
.doc-body code{background:var(--soft);border:1px solid var(--line);border-radius:6px;padding:2px 7px;font-size:.88em;color:var(--pri-d);font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.doc-body pre{background:var(--navy);color:#e6e6fa;border-radius:12px;padding:18px 20px;overflow:auto;margin:16px 0}
.doc-body pre code{background:none;border:0;color:#e6e6fa;padding:0}
.callout{background:var(--pri-t);border-left:3px solid var(--pri);border-radius:10px;padding:14px 18px;margin:18px 0;color:var(--ink)}
.callout.warn{background:#fff7ed;border-color:var(--warn)}
.cap{font-size:.86rem;color:var(--mut);text-align:center;margin:-8px 0 20px}
/* responsive */
@media(max-width:900px){
  .hero .wrap{grid-template-columns:1fr;gap:30px}
  .hero .art{order:2}
  .hero h1{font-size:clamp(1.9rem,8vw,2.6rem)}
  .g3,.steps{grid-template-columns:1fr 1fr}
  .split,.split.rev .txt{grid-template-columns:1fr;order:0}
  .doc{grid-template-columns:1fr;padding-top:24px}
  .doc-nav{position:static;margin-bottom:8px;padding-bottom:12px;border-bottom:1px solid var(--line)}
  .doc-nav h4{margin-top:12px}
  .foot .cols{grid-template-columns:1fr 1fr}
  /* mobile nav dropdown */
  .nav .burger{display:block}
  .nav .links{position:absolute;top:66px;left:0;right:0;flex-direction:column;gap:0;margin:0;
    background:#fff;border-bottom:1px solid var(--line);box-shadow:var(--shadow);padding:6px 0;display:none}
  .nav.open .links{display:flex}
  .nav .links a{padding:13px 22px;font-size:1rem;border-bottom:1px solid var(--line2)}
}
@media(max-width:600px){
  .g3,.g2,.prices,.steps,.foot .cols{grid-template-columns:1fr}
  .hero .stats{gap:20px}
}