/* light premium product UI (easy on eyes) */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

:root{
  --bg:#f5f7fb;
  --bg-elev:#ffffff;
  --bg-soft:#eef2f8;
  --panel:#ffffff;
  --panel2:#f8fafc;
  --line:#e4e9f2;
  --line-strong:#d0d7e6;
  --text:#1a2336;
  --text-2:#2d3a52;
  --muted:#5b6b86;
  --muted-2:#8b97ad;
  --brand:#3b6ff5;
  --brand-2:#2f5de0;
  --brand-hot:#6366f1;
  --brand-soft:#eef3ff;
  --brand-ring:rgba(59,111,245,.16);
  --brand-light:#5b8cff;
  --brand-lighter:#7aa2ff;
  --brand-shadow:rgba(59,111,245,.28);
  --brand-soft-2:#f5f3ff;
  --brand-line:#d6e4ff;
  --brand-line-2:#c7d9ff;
  --brand-line-3:#93b4ff;
  --brand-line-v:#ddd6fe;
  --brand-hover-bg:#f8faff;
  --brand-row:#f7f9ff;
  --brand-glow-1:#e0eaff;
  --brand-glow-2:#f0e9ff;
  --brand-glow-3:#e8efff;
  --good:#0d9f6e;
  --good-soft:#ecfdf5;
  --warn:#c9850a;
  --warn-soft:#fffbeb;
  --bad:#dc3d3d;
  --bad-soft:#fef2f2;
  --ink:#0f172a;
  --radius:18px;
  --radius-sm:14px;
  --radius-xs:11px;
  --shadow:0 1px 2px rgba(15,23,42,.04),0 8px 28px rgba(15,23,42,.06);
  --shadow-lg:0 4px 12px rgba(15,23,42,.04),0 20px 48px rgba(15,23,42,.08);
  --font:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  --mono:"JetBrains Mono",ui-monospace,Consolas,monospace;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  min-height:100vh;
  background:
    radial-gradient(1000px 480px at 90% -8%, var(--brand-glow-1) 0, transparent 55%),
    radial-gradient(800px 400px at 0% 0%, var(--brand-glow-2) 0, transparent 50%),
    var(--bg);
  background-attachment:fixed;
  color:var(--text);
  font:15px/1.65 var(--font);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a{color:var(--brand-2);text-decoration:none;transition:color .15s ease}
a:hover{color:#1d4ed8}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}

/* ---------- topbar ---------- */
.topbar{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.88);
  backdrop-filter:blur(16px) saturate(1.2);
  -webkit-backdrop-filter:blur(16px) saturate(1.2);
  border-bottom:1px solid rgba(228,233,242,.95);
}
.topbar .wrap{display:flex;align-items:center;gap:20px;height:66px}
.brand{
  display:inline-flex;align-items:center;gap:11px;
  font-weight:800;font-size:17px;color:var(--ink);letter-spacing:-.03em;
}
.brand:hover{color:var(--ink)}
.brand-mark{
  width:32px;height:32px;border-radius:10px;
  background:linear-gradient(135deg,var(--brand-light) 0%,var(--brand) 50%,var(--brand-hot) 100%);
  box-shadow:0 6px 16px var(--brand-shadow), inset 0 1px 0 rgba(255,255,255,.3);
  display:inline-flex;align-items:center;justify-content:center;
  color:#fff;font-size:12px;font-weight:900;letter-spacing:-.04em;
}
.mainnav{display:flex;gap:2px;align-items:center}
.mainnav a{
  color:var(--muted);font-weight:600;font-size:13.5px;
  padding:8px 13px;border-radius:999px;transition:all .15s;
}
.mainnav a.on,.mainnav a:hover{color:var(--ink);background:var(--bg-soft)}
.spacer{flex:1}
.actions{display:flex;align-items:center;gap:8px}
.who{color:var(--muted);font-size:13px;margin-right:4px}
.who b{color:var(--brand);font-weight:700}
.langmenu{position:relative}
.langmenu>summary{
  list-style:none;cursor:pointer;padding:7px 12px;
  border:1px solid var(--line);border-radius:999px;background:#fff;
  font-size:13px;font-weight:600;color:var(--text-2);
}
.langmenu>summary::-webkit-details-marker{display:none}
.langmenu>summary::marker{content:""}
.langpop{
  position:absolute;right:0;top:calc(100% + 8px);background:#fff;
  border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow-lg);
  min-width:150px;padding:6px;z-index:60;
}
.langpop a{display:block;padding:9px 12px;border-radius:9px;color:var(--text);font-size:13px;font-weight:600}
.langpop a:hover{background:var(--panel2)}
.langpop a.on{color:var(--brand);background:var(--brand-soft)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:10px 18px;border-radius:999px;
  background:linear-gradient(180deg,var(--brand-light),var(--brand));
  color:#fff;font-weight:700;font-size:13.5px;border:0;cursor:pointer;
  box-shadow:0 1px 0 rgba(255,255,255,.25) inset,0 8px 20px var(--brand-shadow);
  transition:transform .15s,box-shadow .15s,filter .15s;
}
.btn:hover{filter:brightness(1.05);color:#fff;transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn.ghost{
  background:#fff;border:1px solid var(--line-strong);color:var(--text-2);
  box-shadow:0 1px 2px rgba(15,23,42,.04);
}
.btn.ghost:hover{border-color:var(--brand-line-3);color:var(--brand);background:var(--brand-hover-bg)}
.btn.sm{padding:6px 12px;font-size:12.5px;box-shadow:none}
.btn.bad{background:linear-gradient(180deg,#f87171,#dc3d3d);box-shadow:0 8px 18px rgba(220,61,61,.22)}
.btn.good{background:linear-gradient(180deg,#34d399,#0d9f6e);color:#fff;box-shadow:0 8px 18px rgba(13,159,110,.22)}
.btn.block{display:flex;width:100%;border-radius:12px}
.btn.big{padding:14px 26px;font-size:15px}

main.wrap{padding-top:32px;padding-bottom:72px}
h1,h2,h3{color:var(--ink);line-height:1.22;letter-spacing:-.03em;font-weight:800}
h1{font-size:clamp(28px,3.5vw,36px);margin:.15em 0 .5em}
h2{font-size:clamp(22px,2.5vw,28px);margin:2.2em 0 .85em}
h2.section-title{display:flex;align-items:center;gap:14px;margin-top:2.8em}
h2.section-title .sec-label{
  font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;
  color:var(--brand);background:var(--brand-soft);border:1px solid var(--brand-line);
  padding:5px 10px;border-radius:999px;
}
h2.section-title::after{content:"";flex:1;height:1px;background:linear-gradient(90deg,var(--line-strong),transparent)}
.muted{color:var(--muted)}
.lead{font-size:16px;color:var(--muted);max-width:58ch;line-height:1.75}

/* ---------- hero split ---------- */
.hero-wrap{
  display:grid;grid-template-columns:1.12fr .98fr;gap:24px;align-items:stretch;
}
.hero{
  position:relative;padding:40px 36px 36px;border-radius:24px;overflow:hidden;
  background:
    radial-gradient(480px 260px at 100% 0%, var(--brand-glow-3) 0, transparent 55%),
    linear-gradient(165deg,#ffffff 0%,#f7f9fd 100%);
  border:1px solid var(--line);
  box-shadow:var(--shadow-lg);
}
.hero > *{position:relative}
.hero-kicker{
  display:inline-flex;align-items:center;gap:8px;
  padding:5px 12px 5px 6px;border-radius:999px;
  background:var(--good-soft);border:1px solid #a7f3d0;
  color:var(--good);font-size:12px;font-weight:700;
  margin-bottom:18px;
}
.hero-kicker i{
  width:20px;height:20px;border-radius:999px;background:var(--good);color:#fff;
  display:inline-flex;align-items:center;justify-content:center;font-size:11px;font-style:normal;font-weight:900;
}
.hero h1{
  font-size:clamp(30px,4.2vw,44px);max-width:14em;margin:0 0 14px;
  letter-spacing:-.035em;line-height:1.1;color:var(--ink);
}
.hero p{font-size:16.5px;color:var(--muted);max-width:42ch;margin:0;line-height:1.75}
.hero .cta{margin-top:26px;display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.pricehook{
  margin-top:20px;display:inline-flex;align-items:center;gap:10px;
  padding:14px 24px;border-radius:16px;max-width:none;
  background:linear-gradient(90deg,#ff7a18 0,#ff3d68 100%);border:none;
  color:#fff;font-weight:900;font-size:19px;line-height:1.35;letter-spacing:.3px;
  box-shadow:0 12px 30px rgba(255,80,80,.35);
  animation:hookpop 2.4s ease-in-out infinite;
}
@keyframes hookpop{0%,100%{transform:scale(1)}50%{transform:scale(1.035)}}
@media(max-width:820px){.pricehook{font-size:16px;padding:12px 18px}}

/* terminal — soft dark panel (only small area, not whole page) */
.hero-panel{
  border-radius:24px;overflow:hidden;
  background:linear-gradient(180deg,#1a2236,#121826);
  border:1px solid #2a3448;
  box-shadow:var(--shadow-lg);
  display:flex;flex-direction:column;min-height:100%;
}
.term-bar{
  display:flex;align-items:center;gap:8px;padding:12px 16px;
  background:rgba(255,255,255,.04);border-bottom:1px solid rgba(255,255,255,.06);
}
.term-dot{width:10px;height:10px;border-radius:50%}
.term-dot.r{background:#ff5f57}.term-dot.y{background:#febc2e}.term-dot.g{background:#28c840}
.term-title{margin-left:8px;font-size:12px;color:#8b9bb8;font-weight:600;font-family:var(--mono)}
.term-body{
  padding:18px 16px 20px;font-family:var(--mono);font-size:12.5px;line-height:1.7;
  color:#a8b8d8;flex:1;
}
.term-body .cmt{color:#5c6b86}
.term-body .cmd{color:#e8eef9}
.term-body .ok{color:#6ee7b7}
.term-body .key{color:#93c5fd}
.term-body .str{color:#c4b5fd}
.term-body .prompt{color:var(--brand-lighter);user-select:none}
.term-footer{
  padding:12px 14px;border-top:1px solid rgba(255,255,255,.06);
  display:flex;gap:8px;flex-wrap:wrap;
}
.term-chip{
  font-size:11px;font-weight:700;color:#9aa8c2;
  padding:5px 10px;border-radius:999px;
  background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.08);
}

/* badges */
.badges{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 16px}
.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:6px 12px;border-radius:999px;font-weight:700;font-size:11.5px;
  background:#fff;border:1px solid var(--line);color:var(--text-2);
  box-shadow:0 1px 2px rgba(15,23,42,.03);
}
.badge.blue{background:var(--brand-soft);border-color:var(--brand-line-2);color:var(--brand-2)}
.badge.green{background:var(--good-soft);border-color:#a7f3d0;color:var(--good)}
.badge.warn{background:var(--warn-soft);border-color:#fde68a;color:var(--warn)}

/* trust metrics */
.trustbar{
  display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:24px;
}
.trustbar .item{
  background:#fff;border:1px solid var(--line);border-radius:16px;
  padding:18px 16px;text-align:left;box-shadow:var(--shadow);
  border-top:2px solid var(--brand-line-2);
}
.trustbar .item .n{font-size:20px;font-weight:800;color:var(--ink);letter-spacing:-.02em}
.trustbar .item .l{font-size:12.5px;color:var(--muted);margin-top:5px;font-weight:600}

/* cards / grids */
.grid{display:grid;gap:16px}
.grid.c3{grid-template-columns:repeat(3,1fr)}
.grid.c4{grid-template-columns:repeat(4,1fr)}
.grid.c2{grid-template-columns:repeat(2,1fr)}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;box-shadow:var(--shadow);
  transition:border-color .15s,transform .15s,box-shadow .15s;
}
.card:hover{border-color:#b8cdff;transform:translateY(-2px);box-shadow:var(--shadow-lg)}
.card h3{margin:0 0 8px;font-size:16px;letter-spacing:-.02em;color:var(--ink)}
.card p{margin:0;color:var(--muted);font-size:14px;line-height:1.7}
.card .ico{
  width:42px;height:42px;border-radius:12px;margin-bottom:14px;
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--brand-soft);color:var(--brand-2);font-size:17px;
  border:1px solid var(--brand-line);
}
.card .ico.g{background:var(--good-soft);border-color:#a7f3d0;color:var(--good)}
.card .ico.w{background:var(--warn-soft);border-color:#fde68a;color:var(--warn)}
.card .ico.v{background:var(--brand-soft-2);border-color:var(--brand-line-v);color:#7c3aed}

/* steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:8px}
.step{
  padding:22px;border-radius:var(--radius);
  background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);
}
.step .num{
  width:30px;height:30px;border-radius:9px;display:inline-flex;align-items:center;justify-content:center;
  background:linear-gradient(180deg,var(--brand-light),var(--brand));color:#fff;font-size:13px;font-weight:800;margin-bottom:12px;
  box-shadow:0 4px 12px var(--brand-shadow);
}
.step h3{margin:0 0 6px;font-size:15px;color:var(--ink)}
.step p{margin:0;color:var(--muted);font-size:13.5px;line-height:1.65}

.stack-row{display:flex;flex-wrap:wrap;gap:10px;margin:8px 0 0}
.stack-pill{
  padding:10px 15px;border-radius:12px;font-size:13px;font-weight:700;
  color:var(--text-2);background:#fff;border:1px solid var(--line);
  box-shadow:0 1px 2px rgba(15,23,42,.03);
}

/* stats / tables */
.stat{padding:18px}
.stat .k{color:var(--muted);font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.05em}
.stat .v{font-size:26px;font-weight:800;color:var(--ink);margin-top:6px;letter-spacing:-.02em}
.stat .v.good{color:var(--good)} .stat .v.warn{color:var(--warn)} .stat .v.bad{color:var(--bad)}
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{text-align:left;padding:13px 15px;border-bottom:1px solid var(--line)}
th{
  color:var(--muted-2);font-size:11px;text-transform:uppercase;letter-spacing:.05em;
  background:var(--panel2);font-weight:700;
}
td{color:var(--text-2)}
td.r,th.r{text-align:right;font-variant-numeric:tabular-nums;font-family:var(--mono);font-size:13px}
tr:last-child td{border-bottom:0}
tr:hover td{background:var(--brand-row)}
.tablewrap{
  overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);
  background:#fff;box-shadow:var(--shadow);
}
.pill{display:inline-block;padding:3px 10px;border-radius:999px;font-size:11.5px;font-weight:700;border:1px solid var(--line)}
.pill.good{color:var(--good);border-color:#a7f3d0;background:var(--good-soft)}
.pill.warn{color:var(--warn);border-color:#fde68a;background:var(--warn-soft)}
.pill.bad{color:var(--bad);border-color:#fecaca;background:var(--bad-soft)}
.pill.mut{color:var(--muted);background:var(--panel2)}

/* forms */
form.stack{display:flex;flex-direction:column;gap:14px;max-width:420px}
label{font-weight:600;font-size:13px;display:block;margin-bottom:6px;color:var(--text-2)}
input,select,textarea{
  width:100%;padding:11px 13px;background:#fff;
  border:1px solid var(--line-strong);border-radius:var(--radius-xs);
  color:var(--text);font-size:15px;transition:border-color .15s,box-shadow .15s;
}
input:focus,select:focus,textarea:focus{
  outline:none;border-color:var(--brand);box-shadow:0 0 0 4px var(--brand-ring);
}
.inline{display:flex;gap:10px;align-items:flex-end;flex-wrap:wrap}
.flash{padding:12px 14px;border-radius:12px;margin:14px 0;border:1px solid var(--line);font-size:14px}
.flash.error,.flash.err{background:var(--bad-soft);border-color:#fecaca;color:#991b1b}
.flash.ok{background:var(--good-soft);border-color:#a7f3d0;color:#065f46}
.flash.info{background:var(--brand-soft);border-color:var(--brand-line-2);color:#1e40af}
.authbox{
  max-width:420px;margin:28px auto;padding:32px 28px 28px;
  background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow-lg);
}
.authbox h1{font-size:26px;margin-bottom:8px;color:var(--ink)}
.code{
  background:#1a2236;border:1px solid #2a3448;border-radius:14px;
  padding:16px 18px;font:13px/1.7 var(--mono);color:var(--brand-line);
  overflow-x:auto;white-space:pre;
}
.kv{display:flex;justify-content:space-between;padding:8px 0;border-bottom:1px solid var(--line)}
.kv .k{color:var(--muted)}
.copy{cursor:pointer;user-select:all}
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin:6px 0 18px}
.tabs a{
  padding:8px 14px;border-radius:999px;color:var(--muted);font-weight:700;
  border:1px solid transparent;font-size:13px;
}
.tabs a.on{background:#fff;border-color:var(--line);color:var(--ink);box-shadow:var(--shadow)}
.tabs a:hover{color:var(--ink)}
.small{font-size:13px}
.right{text-align:right}
.mt{margin-top:18px}.mb{margin-bottom:18px}
.spark{display:flex;align-items:flex-end;gap:3px;height:60px}
.spark i{flex:1;background:linear-gradient(180deg,var(--brand-lighter),var(--brand));border-radius:3px 3px 0 0;min-height:2px}

/* blog */
.artlist{display:grid;gap:14px}
.artcard{
  display:block;padding:20px 22px;border-radius:16px;background:#fff;
  border:1px solid var(--line);box-shadow:var(--shadow);transition:.15s;
}
.artcard:hover{border-color:var(--brand-line-3);transform:translateY(-2px);box-shadow:var(--shadow-lg)}
.artcard h3{margin:0 0 6px;color:var(--ink)}
.artmeta{color:var(--muted);font-size:12px;margin-bottom:6px}
.article{max-width:760px;margin:0 auto}
.article h2{font-size:22px;margin:1.3em 0 .5em}
.article p{margin:.8em 0;color:var(--text-2)}
.article ul{padding-left:1.3em}.article li{margin:.35em 0}
.ctabox{
  margin:36px 0 8px;padding:36px 28px;border-radius:24px;text-align:center;
  background:linear-gradient(145deg,var(--brand-soft) 0%,var(--brand-soft-2) 50%,#ffffff 100%);
  border:1px solid var(--brand-line);box-shadow:var(--shadow-lg);
}
.ctabox h3{font-size:clamp(22px,3vw,28px);margin:.1em 0 .45em;color:var(--ink)}
.ctabox p{color:var(--muted);margin:0 0 20px;font-size:15px}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0 4px}
.chip{
  display:inline-flex;align-items:center;gap:5px;padding:7px 13px;border-radius:999px;
  background:#fff;border:1px solid var(--line);color:var(--muted);font-weight:700;font-size:13px;
}
.chip:hover{border-color:var(--brand);color:var(--brand-2)}
.chip.on{background:var(--brand-soft);border-color:var(--brand-line-2);color:var(--brand-2)}
.chip.sm{padding:3px 10px;font-size:12px}
.chipn{background:var(--panel2);border-radius:999px;padding:0 7px;font-size:11px;color:var(--muted)}
.qsrow{display:grid;grid-template-columns:1fr 1fr;gap:14px;align-items:stretch}
@media(max-width:820px){.qsrow{grid-template-columns:1fr}}
.qscol{display:flex;flex-direction:column;min-width:0}
.qscol .code{flex:1;margin-top:6px}
.qslabel{font-size:13px;color:var(--muted);font-weight:700}
.related{margin:26px 0;padding:18px 20px;border:1px solid var(--line);border-radius:16px;background:var(--panel2)}
.related h3{margin:0 0 8px;font-size:16px}
.related ul{margin:0;padding-left:1.1em}
.related li{margin:5px 0}

/* footer */
.foot{
  border-top:1px solid var(--line);
  background:#fff;
  padding:44px 0 28px;margin-top:28px;color:var(--muted);font-size:13px;
}
.foot-grid{
  display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:28px;margin-bottom:28px;
}
.foot-brand{font-weight:800;font-size:16px;color:var(--ink);margin-bottom:10px;display:flex;align-items:center;gap:10px}
.foot-brand .brand-mark{width:26px;height:26px;font-size:10px;border-radius:8px}
.foot-desc{color:var(--muted);line-height:1.7;max-width:34ch;margin:0}
.foot h4{margin:0 0 12px;font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted-2);font-weight:700}
.foot-col a{display:block;color:var(--text-2);font-weight:600;padding:5px 0}
.foot-col a:hover{color:var(--brand)}
.foot-bottom{
  display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;
  padding-top:20px;border-top:1px solid var(--line);color:var(--muted-2);font-size:12px;
}
.foot-trust{display:flex;gap:14px;flex-wrap:wrap}
.foot-trust span{display:inline-flex;align-items:center;gap:5px;font-weight:600;color:var(--muted)}

.page-head{margin-bottom:24px;max-width:52ch}
.page-head h1{margin-bottom:10px}
.page-head p{color:var(--muted);font-size:16px;line-height:1.7;margin:0}

@media(max-width:960px){
  .hero-wrap{grid-template-columns:1fr}
  .grid.c3,.grid.c4,.grid.c2,.trustbar,.steps{grid-template-columns:1fr 1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .grid.c3,.grid.c4,.grid.c2,.trustbar,.steps{grid-template-columns:1fr}
  .hero{padding:26px 20px}
  .mainnav{display:none}
  .topbar .wrap{height:60px}
  .foot-grid{grid-template-columns:1fr}
}

.panel{background:var(--panel)}
.stack{display:flex;flex-direction:column;gap:12px}