:root{--bg:#fff;--bg-soft:#f7f7f8;--bg-hero:#fbfbfd;--ink:#0b0b0f;--ink-soft:#3f3f46;--muted:#71717a;--line:#ececf0;--accent:#25d366;--accent-ink:#fff;--accent-hover:#1ebe5b;--accent-soft:#e7faf0;--ok:#16a34a;--radius:14px;--radius-lg:22px;--shadow-sm:0 1px 2px rgba(9,9,20,.06),0 1px 3px rgba(9,9,20,.04);--shadow-md:0 10px 30px rgba(9,9,20,.08);--shadow-lg:0 24px 60px rgba(9,9,20,.12);--font:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:var(--font);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}a{color:inherit;text-decoration:none}.container{width:100%;max-width:1120px;margin:0 auto;padding:0 24px}.nav{position:-webkit-sticky;position:sticky;top:0;z-index:50;-webkit-backdrop-filter:saturate(180%) blur(12px);backdrop-filter:saturate(180%) blur(12px);background:hsla(0,0%,100%,.8);border-bottom:1px solid var(--line)}.nav-inner{justify-content:space-between;height:66px}.brand,.nav-inner{display:flex;align-items:center}.brand{gap:10px;font-weight:700;font-size:18px;letter-spacing:-.02em}.brand-dot{width:26px;height:26px;border-radius:8px;background:var(--accent);display:grid;place-items:center;color:#fff;font-size:15px}.nav-links{display:flex;gap:28px;color:var(--ink-soft);font-size:15px;font-weight:500}.nav-links a:hover{color:var(--ink)}@media (max-width:760px){.nav-links{display:none}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:inherit;font-size:15px;font-weight:600;line-height:1;padding:12px 20px;border-radius:999px;border:1px solid transparent;cursor:pointer;transition:background .15s ease,transform .05s ease,box-shadow .15s ease}.btn:active{transform:translateY(1px)}.btn-primary{background:var(--accent);color:var(--accent-ink);box-shadow:var(--shadow-sm)}.btn-primary:hover{background:var(--accent-hover)}.btn-primary:disabled{opacity:.55;cursor:not-allowed}.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line)}.btn-ghost:hover{background:var(--bg-soft)}.btn-lg{padding:15px 26px;font-size:16px}.hero{background:linear-gradient(180deg,var(--bg-hero),var(--bg));padding:72px 0 64px}.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;grid-gap:56px;gap:56px;align-items:center}@media (max-width:900px){.hero-grid{grid-template-columns:1fr;gap:40px}}.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--accent);background:var(--accent-soft);padding:6px 12px;border-radius:999px;margin-bottom:22px}h1.hero-title{font-size:54px;line-height:1.05;letter-spacing:-.035em;font-weight:800;margin:0 0 20px}@media (max-width:900px){h1.hero-title{font-size:40px}}.hero-sub{font-size:19px;line-height:1.6;color:var(--ink-soft);margin:0 0 28px;max-width:30em}.hero-cta-row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}.hero-note{margin-top:18px;font-size:14px;color:var(--muted)}.hero-note b{color:var(--ink);font-weight:600}.card{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:28px}.card h3{margin:0 0 4px;font-size:20px;letter-spacing:-.02em}.card .card-sub{margin:0 0 22px;color:var(--muted);font-size:14px}.field{margin-bottom:16px}.label{display:block;font-size:13px;font-weight:600;color:var(--ink-soft);margin-bottom:7px}.input{width:100%;font-family:inherit;font-size:15px;color:var(--ink);padding:12px 14px;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg);transition:border-color .15s ease,box-shadow .15s ease}.input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}.hint{font-size:12.5px;color:var(--muted);margin-top:7px}.error{color:#dc2626;font-size:13px;margin-top:10px}.select{position:relative}.select-btn{width:100%;display:flex;align-items:center;gap:10px;text-align:left;padding:12px 14px;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg);font-family:inherit;font-size:15px;cursor:pointer;color:var(--ink)}.select-btn:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}.select-btn .chev{margin-left:auto;color:var(--muted)}.select-flag{font-size:20px;line-height:1}.select-placeholder{color:var(--muted)}.select-panel{position:absolute;top:calc(100% + 6px);left:0;right:0;z-index:40;background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-md);overflow:hidden}.select-search{width:100%;border:none;border-bottom:1px solid var(--line);padding:12px 14px;font-family:inherit;font-size:14px}.select-search:focus{outline:none}.select-list{max-height:260px;overflow-y:auto}.select-opt{display:flex;align-items:center;gap:10px;padding:10px 14px;cursor:pointer;font-size:14.5px}.select-opt.active,.select-opt:hover{background:var(--accent-soft)}.select-opt .dial{margin-left:auto;color:var(--muted);font-size:13px}.select-empty{padding:16px 14px;color:var(--muted);font-size:14px}.qr-wrap{text-align:center;padding:8px 0 4px}.qr-frame{display:inline-block;padding:14px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm)}.qr-frame img{display:block;width:232px;height:232px;image-rendering:pixelated}.qr-status{margin-top:16px;font-size:14px;color:var(--muted);display:inline-flex;align-items:center;gap:8px}.spinner{width:14px;height:14px;border:2px solid var(--line);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}.qr-gen{position:relative;width:232px;height:232px;margin:0 auto;border-radius:var(--radius);border:1px solid var(--line);overflow:hidden;background:linear-gradient(135deg,#eef0f3,#e2e4e9)}.qr-gen:before{content:"";position:absolute;inset:0;background:linear-gradient(100deg,transparent 35%,hsla(0,0%,100%,.65) 50%,transparent 65%);transform:translateX(-100%);animation:qr-shimmer 1.6s ease-in-out infinite}@keyframes qr-shimmer{to{transform:translateX(100%)}}.qr-gen-scan{position:absolute;left:9%;right:9%;height:3px;border-radius:3px;top:9%;background:var(--accent);box-shadow:0 0 12px 1px var(--accent);animation:qr-scan 1.9s ease-in-out infinite}@keyframes qr-scan{0%,to{top:9%}50%{top:88%}}.success{text-align:center;padding:6px 0}.success .check{width:52px;height:52px;border-radius:50%;background:var(--ok);color:#fff;display:grid;place-items:center;font-size:26px;margin:0 auto 14px}.keybox{display:flex;align-items:center;gap:8px;background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:10px 12px;margin-top:6px}.keybox code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;color:var(--ink);overflow-x:auto;white-space:nowrap}.keybox button{margin-left:auto}.sendbox{margin:8px 0 0;background:#0d1117;color:#e6edf3;border-radius:var(--radius);padding:14px 16px;overflow-x:auto}.sendbox code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12.5px;line-height:1.6;white-space:pre;color:#e6edf3}.section{padding:88px 0}.section-head{text-align:center;max-width:40em;margin:0 auto 52px}.section-head h2{font-size:36px;letter-spacing:-.03em;font-weight:800;margin:0 0 14px}.section-head p{font-size:18px;color:var(--ink-soft);margin:0;line-height:1.6}.features{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:22px;gap:22px}@media (max-width:860px){.features{grid-template-columns:1fr}}.feature{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius-lg);padding:26px;box-shadow:var(--shadow-sm)}.feature .ico{width:44px;height:44px;border-radius:12px;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center;font-size:22px;margin-bottom:16px}.feature h4{margin:0 0 8px;font-size:18px;letter-spacing:-.01em}.feature p{margin:0;color:var(--ink-soft);font-size:15px;line-height:1.6}.code-window{background:#0d1117;border:1px solid hsla(0,0%,100%,.08);border-radius:16px;overflow:hidden;box-shadow:var(--shadow-lg);width:100%}.code-bar{display:flex;align-items:center;gap:14px;padding:12px 16px;background:hsla(0,0%,100%,.025);border-bottom:1px solid hsla(0,0%,100%,.06)}.code-dots{display:flex;gap:8px;flex:none}.code-dot{width:12px;height:12px;border-radius:50%}.code-dot.r{background:#ff5f57}.code-dot.y{background:#febc2e}.code-dot.g{background:#28c840}.code-tabs{display:flex;gap:4px;margin-left:auto}.code-tab{font-family:inherit;font-size:13px;font-weight:500;color:#8b949e;background:transparent;border:0;padding:5px 12px;border-radius:8px;cursor:pointer;transition:background .12s ease,color .12s ease}.code-tab:hover{color:#c9d1d9}.code-tab.active{background:hsla(0,0%,100%,.09);color:#fff}.code-body{padding:20px 22px;overflow-x:auto}.code-body pre{margin:0;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13.5px;line-height:1.75;color:#e6edf3;white-space:pre}.tok-com{color:#7d8590}.tok-str{color:#7ee787}.checks{display:grid;grid-template-columns:repeat(2,1fr);grid-gap:22px 36px;gap:22px 36px}@media (max-width:720px){.checks{grid-template-columns:1fr}}.check{display:flex;gap:13px;align-items:flex-start}.check .ic{flex:none;width:24px;height:24px;border-radius:7px;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center;font-size:13px;font-weight:800;margin-top:2px}.check b{display:block;font-size:16px;letter-spacing:-.01em;margin-bottom:3px}.check p{margin:0;color:var(--ink-soft);font-size:14.5px;line-height:1.55}.contrast{display:grid;grid-template-columns:1fr 1fr;grid-gap:22px;gap:22px;margin-bottom:52px}@media (max-width:820px){.contrast{grid-template-columns:1fr}}.contrast-col{border:1px solid var(--line);border-radius:var(--radius-lg);padding:28px;background:var(--bg)}.contrast-col.us{border-color:var(--accent);background:var(--accent-soft);box-shadow:var(--shadow-sm)}.contrast-tag{display:inline-block;font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;padding:5px 11px;border-radius:999px;margin-bottom:16px}.contrast-col.them .contrast-tag{background:#fdecea;color:#c0392b}.contrast-col.us .contrast-tag{background:var(--accent);color:#fff}.contrast-col h4{margin:0 0 10px;font-size:19px;letter-spacing:-.02em}.contrast-col p{margin:0;color:var(--ink-soft);line-height:1.6;font-size:15px}.compare-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);background:var(--bg)}.compare{width:100%;border-collapse:collapse;min-width:680px;font-size:15px}.compare td,.compare th{padding:15px 18px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}.compare tbody tr:last-child td{border-bottom:0}.compare thead th{font-size:13px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}.compare td.us,.compare thead th.us{background:var(--accent-soft)}.compare thead th.us{color:var(--accent)}.compare tbody td:first-child{color:var(--ink);font-weight:600;width:26%}.compare td{color:var(--ink-soft)}.compare td.us{color:var(--ink);font-weight:500}.compare .neg:before{content:"✕ ";color:#d0402b;font-weight:700}.compare .pos:before{content:"✓ ";color:var(--accent);font-weight:700}.builder{display:grid;grid-template-columns:1fr 1fr;grid-gap:22px;gap:22px;align-items:start}@media (max-width:900px){.builder{grid-template-columns:1fr}}.builder-flags{display:flex;flex-direction:column;gap:10px}.flag{display:flex;gap:12px;align-items:flex-start;padding:14px 16px;border:1px solid var(--line);border-radius:var(--radius);cursor:pointer;transition:border-color .12s ease,background .12s ease}.flag.on,.flag:hover{border-color:var(--accent)}.flag.on{background:var(--accent-soft)}.flag input{position:absolute;opacity:0;pointer-events:none}.flag-box{flex:none;width:20px;height:20px;border-radius:6px;border:2px solid var(--line);margin-top:2px;display:grid;place-items:center;transition:background .12s ease,border-color .12s ease}.flag.on .flag-box{background:var(--accent);border-color:var(--accent)}.flag.on .flag-box:after{content:"✓";color:#fff;font-size:12px;font-weight:800}.flag b{display:block;font-size:15px;margin-bottom:2px}.flag-desc{display:block;color:var(--ink-soft);font-size:13.5px;line-height:1.5}.flag-code{display:inline-block;margin-top:6px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12px;color:var(--accent);background:var(--bg);border:1px solid var(--line);border-radius:6px;padding:1px 7px}.builder-code{background:#0d1117;border:1px solid hsla(0,0%,100%,.08);border-radius:16px;overflow:hidden;box-shadow:var(--shadow-md);position:-webkit-sticky;position:sticky;top:84px}.footer{border-top:1px solid var(--line);padding:40px 0;color:var(--muted);font-size:14px}.footer-inner{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}