/* DeruiKnow landing — shared styles */
*{margin:0;padding:0;box-sizing:border-box}
:root{
  --brand:#0ea5e9;--brand2:#22d3ee;--brand-d:#0284c7;
  --bg:#0b1020;--card:rgba(255,255,255,.05);--border:rgba(255,255,255,.1);
  --fg:#e8eefc;--muted:#94a3b8;--ok:#22c55e;--warn:#fbbf24;
}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;color:#fff;background:linear-gradient(135deg,#0b1020,#0d1a36 50%,#0b1020);min-height:100vh;-webkit-font-smoothing:antialiased;line-height:1.6}
a{text-decoration:none;color:inherit}
img{max-width:100%}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}

/* Header */
header{position:sticky;top:0;z-index:100;padding:15px 40px;display:flex;justify-content:space-between;align-items:center;background:rgba(11,16,32,.86);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.logo{font-size:23px;font-weight:800;color:#fff;letter-spacing:.5px;display:flex;align-items:center;gap:9px}
.logo .dot{width:12px;height:12px;border-radius:4px;background:linear-gradient(135deg,var(--brand),var(--brand2));display:inline-block;flex-shrink:0}
.logo span{color:var(--brand2)}
.nav{display:flex;align-items:center;gap:22px}
.nav a{color:var(--muted);font-size:14px;transition:color .2s}
.nav a:hover,.nav a.active{color:#fff}
.nav .btn-cta{padding:8px 18px;background:var(--brand);border-radius:7px;color:#fff;font-weight:600;font-size:14px}
.nav .btn-cta:hover{background:var(--brand-d);color:#fff}
.lang{background:transparent;border:1px solid var(--border);color:#cbd5e1;border-radius:7px;padding:6px 12px;cursor:pointer;font-size:13px;font-weight:600}
.lang:hover{border-color:var(--brand);color:#fff}

/* Buttons */
.btn{display:inline-block;padding:13px 32px;border-radius:9px;font-size:15.5px;font-weight:600;transition:all .3s;cursor:pointer;border:none}
.btn.primary{background:var(--brand);color:#fff}
.btn.primary:hover{background:var(--brand-d);transform:translateY(-2px)}
.btn.outline{border:2px solid rgba(14,165,233,.6);color:#7dd3fc;background:transparent}
.btn.outline:hover{background:rgba(14,165,233,.12);color:#fff}

/* Hero */
.hero{text-align:center;padding:80px 20px 50px}
.hero .tagline{display:inline-block;padding:6px 16px;background:rgba(14,165,233,.14);border:1px solid rgba(14,165,233,.35);border-radius:20px;color:#7dd3fc;font-size:13px;margin-bottom:24px}
.hero h1{font-size:48px;line-height:1.28;font-weight:800;margin-bottom:20px}
.hero h1 .grad{background:linear-gradient(135deg,var(--brand),var(--brand2));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero p.lead{font-size:18px;color:var(--muted);max-width:720px;margin:0 auto 34px;line-height:1.85}
.hero .cta{display:inline-block;padding:15px 40px;background:var(--brand);color:#fff;border-radius:9px;font-size:16.5px;font-weight:600;transition:all .3s}
.hero .cta:hover{background:var(--brand-d);transform:translateY(-2px)}
.hero .cta-outline{display:inline-block;padding:15px 36px;border:2px solid rgba(14,165,233,.6);color:#7dd3fc;border-radius:9px;font-size:16.5px;font-weight:600;margin-left:14px;transition:all .3s}
.hero .cta-outline:hover{background:rgba(14,165,233,.12);color:#fff}
.hero .verified{margin-top:24px;color:#64748b;font-size:13px}
.hero .verified a{color:#7dd3fc}

/* Page head (inner pages) */
.page-head{text-align:center;padding:58px 20px 10px}
.page-head h1{font-size:36px;font-weight:800;margin-bottom:12px}
.page-head p{color:var(--muted);font-size:16px;max-width:680px;margin:0 auto;line-height:1.8}

/* Stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;max-width:1000px;margin:24px auto 0;padding:0 20px}
.stat{background:var(--card);border:1px solid var(--border);border-radius:13px;padding:22px 16px;text-align:center}
.stat .num{font-size:25px;font-weight:800;color:#fff}
.stat .num b{color:var(--brand2)}
.stat .lab{color:var(--muted);font-size:12.5px;margin-top:6px;line-height:1.6}

/* Sections */
.section{max-width:1080px;margin:0 auto;padding:68px 20px}
.section.tight{padding-top:0}
.section h2{text-align:center;font-size:32px;font-weight:800;margin-bottom:12px}
.section .sub{text-align:center;color:var(--muted);font-size:15.5px;margin-bottom:46px;line-height:1.8}

/* Pain / cards / features */
.pains{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;max-width:960px;margin:0 auto}
.pain{background:var(--card);border:1px solid var(--border);border-left:3px solid #f97316;border-radius:12px;padding:22px 24px}
.pain h4{color:#fff;font-size:16px;margin-bottom:8px}
.pain p{color:var(--muted);font-size:14px;line-height:1.75}
.cards,.features{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:28px;transition:transform .2s,border-color .2s}
.card:hover{transform:translateY(-4px);border-color:rgba(14,165,233,.45)}
.card .ic{width:44px;height:44px;border-radius:11px;background:rgba(14,165,233,.14);display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.card .ic svg{width:23px;height:23px;stroke:var(--brand2);fill:none;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.card h3{color:#fff;font-size:18px;margin-bottom:9px}
.card p{color:var(--muted);font-size:14px;line-height:1.8}
.card .layer-tag{display:inline-block;font-size:12px;color:var(--brand2);border:1px solid rgba(14,165,233,.4);border-radius:6px;padding:2px 9px;margin-bottom:12px;font-weight:600;letter-spacing:.5px}

/* Compare table */
.table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:14px}
table{width:100%;border-collapse:collapse;min-width:640px}
th,td{padding:15px 18px;text-align:left;font-size:14px;border-bottom:1px solid var(--border)}
th{background:rgba(255,255,255,.04);color:#fff;font-size:14.5px}
th.brand{color:var(--brand2)}
td{color:var(--muted);line-height:1.65}
td.dk{color:#e2e8f0;font-weight:500}
tr:last-child td{border-bottom:none}

/* Steps */
.steps{max-width:840px;margin:0 auto}
.step{display:flex;gap:20px;margin-bottom:28px;align-items:flex-start}
.step-num{width:42px;height:42px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand-d));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;flex-shrink:0;font-size:17px}
.step h4{color:#fff;font-size:17px;margin-bottom:6px}
.step p{color:var(--muted);font-size:14px;line-height:1.75}

/* Audience chips */
.chips{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;max-width:840px;margin:0 auto}
.chip{padding:10px 22px;border:1px solid rgba(14,165,233,.35);border-radius:22px;color:#bae6fd;font-size:14px;background:rgba(14,165,233,.07)}

/* Pricing */
.pricing{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;max-width:820px;margin:0 auto;align-items:stretch}
.price-card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:34px 30px;display:flex;flex-direction:column;position:relative;transition:transform .2s}
.price-card:hover{transform:translateY(-4px)}
.price-card.featured{border:2px solid var(--brand);background:rgba(14,165,233,.08)}
.price-card .badge{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--brand);color:#fff;font-size:12px;padding:4px 16px;border-radius:12px;font-weight:600;white-space:nowrap}
.price-card .tier{font-size:19px;font-weight:700;margin-bottom:6px}
.price-card .who{color:var(--muted);font-size:12.5px;margin-bottom:18px;min-height:18px}
.price-card .amount{font-size:40px;font-weight:800}
.price-card .amount small{font-size:15px;color:var(--muted);font-weight:400}
.price-card .annual{color:#7dd3fc;font-size:13px;margin:6px 0 18px}
.price-card ul{list-style:none;flex:1;margin-bottom:22px}
.price-card li{color:#cbd5e1;font-size:13.5px;padding:6px 0 6px 25px;position:relative;line-height:1.6}
.price-card li:before{content:"\2713";position:absolute;left:0;color:var(--ok);font-weight:800}
.price-card li.no{color:#64748b}
.price-card li.no:before{content:"\2715";color:#475569}
.price-card .buy{display:block;text-align:center;padding:13px;border-radius:9px;font-size:15px;font-weight:600;transition:all .3s;cursor:pointer;border:none}
.price-card .buy.primary{background:var(--brand);color:#fff}
.price-card .buy.primary:hover{background:var(--brand-d)}
.price-card .buy.outline{border:1px solid var(--brand);color:#7dd3fc;background:transparent}
.price-card .buy.outline:hover{background:rgba(14,165,233,.14);color:#fff}
.price-card .buy.buy-annual{margin-top:8px;font-size:13.5px;background:transparent;border:1px dashed rgba(14,165,233,.5);color:#7dd3fc;padding:10px}
.price-card .buy.buy-annual:hover{background:rgba(14,165,233,.12)}
.pricing-note{text-align:center;color:#64748b;font-size:13px;margin-top:24px;line-height:1.8}
.pay-secure{display:flex;align-items:center;justify-content:center;gap:10px;margin-top:20px;color:#94a3b8;font-size:13px}
.pay-secure b{color:#cbd5e1}
.notice{background:rgba(251,191,36,.1);border:1px solid rgba(251,191,36,.3);border-radius:10px;padding:14px 16px;color:#fde68a;font-size:13px;line-height:1.8;margin:16px 0}

/* Prove / CTA band */
.prove{background:rgba(14,165,233,.07);border:1px solid rgba(14,165,233,.25);border-radius:14px;padding:34px;text-align:center;max-width:900px;margin:0 auto}
.prove h3{font-size:21px;margin-bottom:12px}
.prove p{color:#cbd5e1;font-size:14.5px;line-height:1.9;max-width:760px;margin:0 auto}
.prove a{color:#7dd3fc;font-weight:600}
.cta-band{text-align:center;padding:70px 20px;background:rgba(14,165,233,.07);border-top:1px solid var(--border);border-bottom:1px solid var(--border);margin-top:20px}
.cta-band h2{font-size:30px;margin-bottom:14px}
.cta-band p{color:var(--muted);font-size:16px;margin-bottom:28px}
.cta-band .cta{display:inline-block;padding:15px 46px;background:var(--brand);color:#fff;border-radius:9px;font-size:16.5px;font-weight:600;transition:all .3s}
.cta-band .cta:hover{background:var(--brand-d)}

/* FAQ */
.faq-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;max-width:940px;margin:0 auto}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:11px;padding:22px}
.faq-item h4{color:#fff;font-size:15.5px;margin-bottom:9px}
.faq-item p{color:var(--muted);font-size:13.5px;line-height:1.85}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:26px;max-width:960px;margin:0 auto;align-items:start}
.contact-card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:28px}
.contact-card h3{font-size:18px;margin-bottom:14px}
.info-item{background:rgba(255,255,255,.03);border:1px solid var(--border);border-radius:11px;padding:16px 18px;margin-bottom:12px}
.info-item h4{font-size:14px;color:var(--brand2);margin-bottom:6px}
.info-item p{font-size:13.5px;color:var(--muted);line-height:1.8}
.info-item p b{color:#e2e8f0}
.field{margin-bottom:14px}
.field label{display:block;font-size:12.5px;color:var(--muted);margin-bottom:5px;font-weight:600}
.field input,.field textarea{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:8px;font-size:14px;outline:none;background:rgba(255,255,255,.05);color:#fff;font-family:inherit}
.field input:focus,.field textarea:focus{border-color:var(--brand)}
.field textarea{min-height:100px;resize:vertical}
.form-err{color:#f87171;font-size:13px;margin-bottom:10px;display:none}

/* Legal / prose */
.doc{padding:44px 20px 64px}
.doc .wrap{max-width:820px;margin:0 auto}
.doc h1{font-size:30px;font-weight:800;margin-bottom:8px}
.doc .meta{color:var(--muted);font-size:13px;margin-bottom:26px}
.doc h2{font-size:20px;margin:30px 0 10px}
.doc h3{font-size:15.5px;margin:20px 0 8px;color:#e2e8f0}
.doc p,.doc li{color:#cbd5e1;font-size:14.5px;line-height:1.95}
.doc ul{padding-left:22px;margin:8px 0}
.doc a{color:var(--brand2)}
.doc .tbd{color:var(--warn);font-weight:600}
.doc code{background:rgba(255,255,255,.08);padding:1px 6px;border-radius:4px;font-size:13px}

/* Footer */
footer{padding:50px 40px 32px;border-top:1px solid var(--border)}
.footer-inner{max-width:1080px;margin:0 auto;display:flex;justify-content:space-between;flex-wrap:wrap;gap:26px}
.footer-col h5{color:#fff;font-size:14px;margin-bottom:14px}
.footer-col a,.footer-col p{color:#64748b;font-size:13px;line-height:2;display:block}
.footer-col a:hover{color:var(--brand2)}
.footer-bottom{max-width:1080px;margin:30px auto 0;padding-top:22px;border-top:1px solid var(--border);text-align:center;color:#475569;font-size:12.5px;line-height:1.9}
.mor{color:#64748b}

@media(max-width:768px){
  header{padding:13px 18px}
  .nav{gap:12px}.nav a:not(.btn-cta){display:none}
  .hero{padding:56px 18px 36px}.hero h1{font-size:30px}.hero p.lead{font-size:15.5px}
  .hero .cta-outline{margin:14px 0 0}
  .stats{grid-template-columns:repeat(2,1fr)}
  .card,.features,.pricing,.pains,.faq-grid,.contact-grid,.cards{grid-template-columns:1fr}
  .section h2{font-size:25px}
  .footer-inner{flex-direction:column}
}