/* RespondThat — shared design system (premium SaaS) */
:root{
  --bg:#ffffff; --soft:#f6f7fb; --softer:#fbfbfe;
  --ink:#0b0c10; --ink2:#1c1f2a; --muted:#5b6172; --muter:#8a90a2;
  --line:#e8eaf2; --line2:#f0f1f7;
  --brand:#5b5bf0; --brand2:#8b5cf6; --brand3:#22d3ee;
  --grad:linear-gradient(105deg,#6366f1 0%,#8b5cf6 48%,#22d3ee 110%);
  --green:#16a34a; --greenbg:#e8f7ee;
  --radius:18px; --radius-sm:12px;
  --shadow:0 1px 2px rgba(16,18,40,.04),0 12px 40px rgba(16,18,40,.06);
  --shadow-lg:0 20px 60px rgba(70,60,160,.14);
  --maxw:1120px;
  --font:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.muted{color:var(--muted)}
.center{text-align:center}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 22px;border-radius:999px;font-weight:600;font-size:15px;border:1px solid transparent;cursor:pointer;transition:.18s;font-family:inherit}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 8px 24px rgba(110,90,240,.28)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 12px 30px rgba(110,90,240,.36)}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:#c9ccdb;background:var(--softer)}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:#000}
.btn-lg{padding:15px 30px;font-size:16px}
.btn-block{width:100%}

/* Nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.8);backdrop-filter:saturate(180%) blur(18px);border-bottom:1px solid var(--line2)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:66px}
.logo{font-size:20px;font-weight:700;letter-spacing:-.4px;display:flex;align-items:center;gap:9px}
.logo .dot{width:26px;height:26px;border-radius:8px;background:var(--grad);display:inline-flex;align-items:center;justify-content:center;color:#fff;font-size:14px;box-shadow:0 6px 16px rgba(110,90,240,.4)}
.nav-links{display:flex;align-items:center;gap:28px;font-size:14.5px;color:var(--muted);font-weight:500}
.nav-links a:hover{color:var(--ink)}
.nav-cta{display:flex;align-items:center;gap:14px}
.nav-cta .signin{font-size:14.5px;color:var(--ink);font-weight:600}
.burger{display:none;background:none;border:none;cursor:pointer;flex-direction:column;gap:5px}
.burger span{width:22px;height:2px;background:var(--ink);border-radius:2px}

/* Hero */
.hero{position:relative;padding:84px 0 60px;text-align:center;overflow:hidden}
.hero::before{content:"";position:absolute;top:-180px;left:50%;transform:translateX(-50%);width:900px;height:520px;background:radial-gradient(closest-side,rgba(139,92,246,.18),rgba(34,211,238,.10),transparent 70%);filter:blur(10px);z-index:0;pointer-events:none}
.hero .container{position:relative;z-index:1}
.pill{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--brand);background:#eef0ff;padding:7px 15px;border-radius:999px;margin-bottom:22px}
.pill .pdot{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 0 4px var(--greenbg)}
.hero h1{font-size:clamp(38px,6vw,62px);line-height:1.04;letter-spacing:-1.6px;font-weight:800;margin-bottom:20px}
.hero .sub{font-size:clamp(17px,2.2vw,20px);color:var(--muted);max-width:660px;margin:0 auto 32px}
.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:14px}
.hero-note{font-size:13.5px;color:var(--muter)}

/* Product mockup */
.mockup{margin:54px auto 0;max-width:760px;background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow-lg);overflow:hidden;text-align:left}
.mockup-bar{display:flex;align-items:center;gap:7px;padding:13px 16px;border-bottom:1px solid var(--line2);background:var(--softer)}
.mockup-bar i{width:11px;height:11px;border-radius:50%;background:#e2e4ee;display:inline-block}
.mockup-body{padding:22px}
.msg{display:flex;gap:12px;margin-bottom:18px}
.msg .av{width:34px;height:34px;border-radius:50%;flex:none;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;color:#fff}
.msg.cust .av{background:#94a3b8}
.msg.ai .av{background:var(--grad)}
.bubble{background:var(--soft);border-radius:14px;padding:13px 16px;font-size:14.5px;max-width:560px}
.msg.ai .bubble{background:#f4f1ff;border:1px solid #e8e2ff}
.bubble .who{font-size:11.5px;font-weight:700;color:var(--muter);text-transform:uppercase;letter-spacing:.5px;margin-bottom:5px}
.mock-actions{display:flex;gap:10px;margin-top:6px;padding-left:46px}
.mock-actions .mini{padding:8px 16px;font-size:13px}

/* Logos strip */
.logos{padding:30px 0 10px;text-align:center}
.logos p{font-size:13px;color:var(--muter);font-weight:600;letter-spacing:.4px;text-transform:uppercase;margin-bottom:18px}
.logos-row{display:flex;gap:38px;justify-content:center;align-items:center;flex-wrap:wrap;opacity:.7}
.logos-row span{font-weight:700;font-size:17px;color:var(--muted);letter-spacing:-.3px}

/* Sections */
.section{padding:74px 0}
.section.soft{background:var(--soft)}
.section-head{max-width:680px;margin:0 auto 46px;text-align:center}
.section-head .ey{font-size:13px;font-weight:700;color:var(--brand);letter-spacing:.6px;text-transform:uppercase;margin-bottom:12px}
.section-head h2{font-size:clamp(28px,4vw,40px);line-height:1.1;letter-spacing:-1px;font-weight:800;margin-bottom:14px}
.section-head p{font-size:17px;color:var(--muted)}

/* Feature grid */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feature{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:.2s}
.feature:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#d9dcea}
.feature .ico{width:46px;height:46px;border-radius:13px;background:#eef0ff;color:var(--brand);display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.feature h3{font-size:18px;font-weight:700;margin-bottom:8px;letter-spacing:-.3px}
.feature p{font-size:14.5px;color:var(--muted)}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;counter-reset:step}
.step{position:relative;padding:28px 24px;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
.step .num{counter-increment:step;width:38px;height:38px;border-radius:11px;background:var(--grad);color:#fff;font-weight:700;display:flex;align-items:center;justify-content:center;margin-bottom:16px;font-size:17px}
.step .num::before{content:counter(step)}
.step h3{font-size:17px;font-weight:700;margin-bottom:7px}
.step p{font-size:14px;color:var(--muted)}

/* Pricing */
.price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;align-items:stretch}
.pcard{border:1px solid var(--line);border-radius:var(--radius);padding:30px;background:#fff;display:flex;flex-direction:column}
.pcard.best{border-color:transparent;box-shadow:var(--shadow-lg);background:#fff;position:relative}
.pcard.best::before{content:"";position:absolute;inset:0;border-radius:var(--radius);padding:1.5px;background:var(--grad);-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;pointer-events:none}
.pcard .tag{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--grad);color:#fff;font-size:12px;font-weight:700;padding:5px 14px;border-radius:999px}
.pcard .pname{font-size:15px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.5px}
.pcard .price{font-size:40px;font-weight:800;letter-spacing:-1.4px;margin:14px 0 4px}
.pcard .price small{font-size:15px;font-weight:500;color:var(--muter)}
.pcard .pdesc{font-size:14px;color:var(--muted);margin-bottom:20px;min-height:40px}
.pcard ul{list-style:none;margin:0 0 24px;flex:1}
.pcard li{padding:9px 0 9px 28px;position:relative;font-size:14.5px;color:var(--ink2);border-top:1px solid var(--line2)}
.pcard li::before{content:"";position:absolute;left:0;top:15px;width:16px;height:16px;border-radius:50%;background:var(--greenbg);background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 24 24' fill='none' stroke='%2316a34a' stroke-width='4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:center}

/* FAQ */
.faq{max-width:760px;margin:0 auto}
.faq-item{border:1px solid var(--line);border-radius:14px;margin-bottom:12px;background:#fff;overflow:hidden}
.faq-q{width:100%;text-align:left;background:none;border:none;padding:18px 22px;font-size:16px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-family:inherit;color:var(--ink)}
.faq-q .chev{transition:.2s;color:var(--muter)}
.faq-item.open .chev{transform:rotate(180deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease;padding:0 22px}
.faq-item.open .faq-a{max-height:300px;padding-bottom:18px}
.faq-a p{font-size:14.5px;color:var(--muted)}

/* CTA band */
.cta-band{background:var(--grad);border-radius:28px;padding:56px 32px;text-align:center;color:#fff;margin:0 0 8px}
.cta-band h2{font-size:clamp(26px,4vw,38px);font-weight:800;letter-spacing:-1px;margin-bottom:12px}
.cta-band p{font-size:17px;opacity:.92;margin-bottom:26px;max-width:540px;margin-left:auto;margin-right:auto}

/* Footer */
.footer{border-top:1px solid var(--line);background:var(--softer);padding:52px 0 30px;margin-top:20px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:30px;margin-bottom:36px}
.footer h4{font-size:13px;text-transform:uppercase;letter-spacing:.5px;color:var(--muter);margin-bottom:14px;font-weight:700}
.footer a{display:block;color:var(--muted);font-size:14.5px;padding:6px 0}
.footer a:hover{color:var(--ink)}
.footer .brand-blurb{color:var(--muted);font-size:14.5px;max-width:300px;margin-top:14px}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;padding-top:24px;border-top:1px solid var(--line);font-size:13.5px;color:var(--muter);flex-wrap:wrap;gap:10px}

/* Forms (auth + app) */
.auth-wrap{max-width:460px;margin:0 auto;padding:64px 24px 80px}
.auth-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:38px 34px;box-shadow:var(--shadow)}
.auth-card h1{font-size:28px;font-weight:800;letter-spacing:-.8px;margin-bottom:8px}
.auth-card .lead{color:var(--muted);font-size:15px;margin-bottom:26px}
.field{margin-bottom:18px}
.field label{display:block;font-size:13.5px;font-weight:600;margin-bottom:8px}
.field input{width:100%;padding:13px 15px;font-size:15px;border:1px solid var(--line);border-radius:12px;outline:none;font-family:inherit;transition:.15s;background:#fff}
.field input:focus{border-color:var(--brand);box-shadow:0 0 0 3px #ecebff}
.seg{display:flex;gap:10px;margin-bottom:8px}
.seg label{flex:1;border:1px solid var(--line);border-radius:12px;padding:14px;text-align:center;cursor:pointer;font-size:14px;font-weight:600;transition:.15s}
.seg input{display:none}
.seg label:has(input:checked){border-color:var(--brand);background:#f5f3ff;color:var(--brand)}
.auth-alt{text-align:center;font-size:14px;color:var(--muted);margin-top:20px}
.auth-alt a{color:var(--brand);font-weight:600}
.msg-line{font-size:13.5px;padding:10px 14px;border-radius:10px;margin-bottom:16px;display:none}
.msg-line.err{display:block;background:#fdecec;color:#b42318;border:1px solid #f6c9c9}
.msg-line.ok{display:block;background:var(--greenbg);color:#15803d;border:1px solid #bfe9cd}

/* App */
.app-top{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.85);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.app-top-in{display:flex;align-items:center;justify-content:space-between;height:62px}
.bal{display:flex;align-items:center;gap:10px;background:var(--soft);border:1px solid var(--line);border-radius:999px;padding:7px 16px;font-size:14px;font-weight:600}
.bal .free{color:var(--green);font-weight:700}
.app-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:22px;margin-top:28px}
.panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.panel h3{font-size:16px;font-weight:700;margin-bottom:16px;letter-spacing:-.3px}
.stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-bottom:8px}
.stat{background:var(--soft);border-radius:14px;padding:16px}
.stat .v{font-size:24px;font-weight:800;letter-spacing:-.5px}
.stat .k{font-size:12.5px;color:var(--muter);font-weight:600}
textarea,select{width:100%;padding:13px 15px;font-size:15px;border:1px solid var(--line);border-radius:12px;outline:none;font-family:inherit;background:#fff;transition:.15s}
textarea:focus,select:focus{border-color:var(--brand);box-shadow:0 0 0 3px #ecebff}
.draft-out{margin-top:16px;background:var(--softer);border:1px solid var(--line2);border-radius:12px;padding:16px;font-size:14.5px;white-space:pre-wrap;min-height:60px}
.usage-list{list-style:none;max-height:280px;overflow:auto}
.usage-list li{display:flex;justify-content:space-between;font-size:13.5px;padding:10px 0;border-top:1px solid var(--line2);color:var(--muted)}
.usage-list li:first-child{border-top:none}
.usage-list .tagk{font-weight:600;color:var(--ink2);text-transform:capitalize}

/* Responsive */
@media(max-width:880px){
  .features,.steps,.price-grid,.app-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .nav-links{display:none}
  .burger{display:flex}
  .nav-links.open{display:flex;position:absolute;top:66px;left:0;right:0;flex-direction:column;background:#fff;padding:18px 24px;border-bottom:1px solid var(--line);gap:16px}
}