:root{
  --green:#34A853; --blue:#4285F4; --red:#EA4335; --yellow:#FBBC04;
  --bg:#ffffff; --fg:#0f172a; --muted:#475569; --card:#f8fafc; --border:#e2e8f0;
  --grad: linear-gradient(135deg,#34A853 0%,#4285F4 100%);
  --shadow: 0 10px 30px rgba(15,23,42,.08);
  --radius:16px;
  --maxw:1120px;
  font-family: ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--fg);line-height:1.65;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.skip-link{position:absolute;left:-9999px}
.skip-link:focus{left:8px;top:8px;background:#000;color:#fff;padding:8px 12px;z-index:99}
.reading-progress{position:fixed;top:0;left:0;height:3px;width:0;background:var(--grad);z-index:50;transition:width .1s linear}
/* header */
.site-header{position:sticky;top:0;background:rgba(255,255,255,.85);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);z-index:40}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 20px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--fg)}
.brand-mark{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:10px;background:var(--grad);color:#fff;font-size:13px;font-weight:800;letter-spacing:.5px}
.brand-name{font-size:1rem}
.primary-nav{display:flex;align-items:center;gap:20px}
.primary-nav ul{display:flex;gap:18px;list-style:none;margin:0;padding:0}
.primary-nav a{color:var(--fg);font-weight:500;font-size:.95rem}
.nav-tools{display:flex;gap:10px;align-items:center}
.search-wrap{position:relative}
.search-wrap input{padding:8px 12px;border-radius:999px;border:1px solid var(--border);background:var(--card);font:inherit;width:180px}
.search-results{position:absolute;top:110%;right:0;left:0;background:#fff;border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow);max-height:280px;overflow:auto;display:none;list-style:none;margin:0;padding:6px}
.search-results.open{display:block}
.search-results li{padding:8px 10px;border-radius:8px;cursor:pointer}
.search-results li:hover,.search-results li[aria-selected="true"]{background:var(--card)}
.theme-toggle,.nav-toggle{background:transparent;border:1px solid var(--border);border-radius:10px;padding:6px 10px;cursor:pointer;font-size:1rem}
.nav-toggle{display:none;flex-direction:column;gap:4px;padding:10px}
.nav-toggle span{width:22px;height:2px;background:var(--fg);display:block}
/* hero */
.hero{background:linear-gradient(180deg,#f0fdf4 0%,#eff6ff 100%);padding:64px 0 56px;border-bottom:1px solid var(--border)}
.hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:48px;align-items:center}
.eyebrow{display:inline-block;font-size:.78rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--green);background:#dcfce7;padding:6px 12px;border-radius:999px;margin-bottom:14px}
.hero h1{font-size:clamp(1.8rem,4vw,2.7rem);line-height:1.15;margin:0 0 14px;letter-spacing:-.02em}
.lede{font-size:1.1rem;color:var(--muted);margin:0 0 22px}
.cta-row{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 22px;border-radius:12px;font-weight:600;border:1px solid transparent;cursor:pointer;transition:transform .15s ease, box-shadow .2s ease}
.btn.primary{background:var(--grad);color:#fff;box-shadow:var(--shadow)}
.btn.primary:hover{transform:translateY(-1px);text-decoration:none}
.btn.ghost{background:#fff;border-color:var(--border);color:var(--fg)}
.hero-meta{display:flex;gap:18px;list-style:none;padding:0;margin:22px 0 0;font-size:.9rem;color:var(--muted);flex-wrap:wrap}
.phone{margin-left:auto;width:260px;height:520px;border-radius:38px;background:#0f172a;padding:14px;box-shadow:var(--shadow);position:relative}
.phone-screen{width:100%;height:100%;border-radius:26px;background:linear-gradient(135deg,#1e293b,#334155);overflow:hidden;display:flex;flex-direction:column;justify-content:flex-end;padding:14px;gap:6px}
.kbd-preview{background:rgba(255,255,255,.08);backdrop-filter:blur(6px);border-radius:14px;padding:10px;display:grid;gap:6px}
.kbd-row{display:flex;gap:4px;justify-content:center}
.kbd-row span{flex:1;text-align:center;padding:10px 0;background:rgba(255,255,255,.15);color:#fff;border-radius:6px;font-size:.75rem;font-weight:600}
.kbd-row .space{flex:6}
/* content */
.content{padding:48px 0}
.content section,.content article{margin-bottom:36px}
.content h2{font-size:1.6rem;margin:0 0 14px;letter-spacing:-.01em}
.content h3{font-size:1.15rem;margin:18px 0 8px}
.content p,.content li{color:var(--fg)}
.content ul,.content ol{padding-left:1.2em}
.faq details{border:1px solid var(--border);border-radius:12px;padding:14px 16px;margin-bottom:10px;background:var(--card)}
.faq summary{cursor:pointer;font-weight:600}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";float:right;font-weight:700}
.faq details[open] summary::after{content:"–"}
/* cards */
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:18px}
.card{display:block;padding:22px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);color:var(--fg);transition:transform .15s ease, box-shadow .2s ease}
.card:hover{transform:translateY(-2px);box-shadow:var(--shadow);text-decoration:none}
.card h2{font-size:1.15rem;margin:8px 0}
.card .read-more{color:var(--blue);font-weight:600;font-size:.9rem}
.breadcrumbs{font-size:.85rem;color:var(--muted);margin-bottom:18px}
.byline{color:var(--muted);font-size:.9rem;margin-top:6px}
.post header{margin-bottom:24px}
.related{margin-top:36px;padding:20px;border:1px dashed var(--border);border-radius:var(--radius);background:var(--card)}
/* form */
.contact-form{display:grid;gap:14px;max-width:560px}
.contact-form label{display:grid;gap:6px;font-weight:600;font-size:.92rem}
.contact-form input,.contact-form select,.contact-form textarea{padding:11px 13px;border:1px solid var(--border);border-radius:10px;font:inherit;background:#fff}
.contact-form input:invalid:not(:placeholder-shown),.contact-form textarea:invalid:not(:placeholder-shown){border-color:var(--red)}
.form-status{color:var(--green);font-weight:600;min-height:1.4em}
.text-center{text-align:center}
/* footer */
.site-footer{background:#0f172a;color:#cbd5e1;padding:54px 0 24px;margin-top:64px}
.footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:28px}
.site-footer h3,.site-footer h4{color:#fff;margin:0 0 12px}
.site-footer ul{list-style:none;padding:0;margin:0;display:grid;gap:8px}
.site-footer a{color:#cbd5e1}
.footer-bottom{border-top:1px solid #1e293b;margin-top:32px;padding-top:18px;font-size:.85rem;color:#94a3b8}