/* tax2290.ai — modern, white, professional */
:root{
  --bg:#ffffff;
  --bg-soft:#f7f9fc;
  --bg-softer:#eef3fa;
  --ink:#0f1f33;
  --ink-soft:#46586f;
  --ink-faint:#7286a0;
  --line:#e3eaf3;
  --line-soft:#eef2f8;
  --brand:#1c63e0;
  --brand-dark:#1547a8;
  --brand-soft:#e9f1ff;
  --accent:#0bb07b;
  --accent-soft:#e4f7ef;
  --warn:#b87503;
  --shadow:0 1px 2px rgba(16,31,51,.04), 0 8px 24px rgba(16,31,51,.06);
  --shadow-lg:0 12px 40px rgba(16,31,51,.12);
  --radius:16px;
  --radius-sm:10px;
  --maxw:1140px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;
}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
h1,h2,h3,h4{font-family:"Montserrat",sans-serif;color:var(--ink);line-height:1.2;margin:0}
.muted{color:var(--ink-soft)}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:10px;font-family:"Montserrat",sans-serif;font-weight:800;font-size:20px;color:var(--ink);text-decoration:none}
.brand .dot{color:var(--brand)}
.brand-mark{width:36px;height:36px;flex:0 0 auto;display:block;filter:drop-shadow(0 3px 8px rgba(28,99,224,.28))}
.nav-links{display:flex;align-items:center;gap:28px;list-style:none;margin:0;padding:0}
.nav-links a{color:var(--ink-soft);font-weight:500;font-size:15px;text-decoration:none}
.nav-links a:hover{color:var(--brand)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:600;font-size:15px;padding:11px 20px;border-radius:var(--radius-sm);border:1px solid transparent;cursor:pointer;transition:.15s;text-decoration:none;font-family:"Inter",sans-serif}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-dark);text-decoration:none}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand);text-decoration:none}
.btn-sm{padding:8px 15px;font-size:14px}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;flex-direction:column;gap:5px;padding:6px}
.nav-toggle span{width:22px;height:2px;background:var(--ink);border-radius:2px}

/* ---------- Hero / GPT interface ---------- */
.hero{padding:54px 0 30px;background:
  radial-gradient(1100px 460px at 50% -120px, var(--brand-soft) 0%, rgba(233,241,255,0) 70%),
  var(--bg)}
.hero-head{text-align:center;max-width:760px;margin:0 auto 30px}
.eyebrow{display:inline-flex;align-items:center;gap:7px;font-size:13px;font-weight:600;color:var(--brand);background:var(--brand-soft);padding:6px 14px;border-radius:100px;margin-bottom:18px}
.hero h1{font-size:clamp(30px,4.4vw,50px);font-weight:800;letter-spacing:-.02em}
.hero h1 .grad{background:linear-gradient(120deg,var(--brand),#0bb07b);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{font-size:clamp(16px,2vw,19px);color:var(--ink-soft);margin-top:16px}

.assistant{max-width:780px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-lg);overflow:hidden}
.assistant-bar{display:flex;align-items:center;gap:10px;padding:13px 18px;border-bottom:1px solid var(--line-soft);background:var(--bg-soft)}
.assistant-bar .ai-badge{width:26px;height:26px;border-radius:8px;background:linear-gradient(135deg,var(--brand),#3b82f6);color:#fff;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:800}
.assistant-bar b{font-size:14px;font-weight:600}
.assistant-bar .tag{margin-left:auto;font-size:12px;color:var(--ink-faint);background:#fff;border:1px solid var(--line);padding:3px 10px;border-radius:100px}

.thread{max-height:0;overflow-y:auto;transition:max-height .35s ease;padding:0 18px}
.thread.open{max-height:440px;padding:18px}
.msg{display:flex;gap:11px;margin-bottom:18px;animation:rise .3s ease}
@keyframes rise{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.msg .av{flex:0 0 30px;width:30px;height:30px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700}
.msg.user{flex-direction:row-reverse}
.msg.user .av{background:var(--ink);color:#fff}
.msg.ai .av{background:var(--brand-soft);color:var(--brand)}
.bubble{padding:13px 16px;border-radius:14px;font-size:15px;max-width:84%}
.msg.user .bubble{background:var(--brand);color:#fff;border-bottom-right-radius:4px}
.msg.ai .bubble{background:var(--bg-soft);color:var(--ink);border:1px solid var(--line-soft);border-bottom-left-radius:4px}
.bubble p{margin:0 0 10px}.bubble p:last-child{margin:0}
.bubble ul,.bubble ol{margin:8px 0;padding-left:20px}.bubble li{margin:4px 0}
.bubble .src{display:block;margin-top:10px;font-size:12px;color:var(--ink-faint)}
.bubble .ans-cta{margin-top:12px;display:flex;gap:8px;flex-wrap:wrap}
.bubble .ans-cta a{font-size:13px;font-weight:600;padding:7px 13px;border-radius:8px;background:#fff;border:1px solid var(--line)}
.bubble .ans-cta a.go{background:var(--brand);color:#fff;border-color:var(--brand)}
.typing span{display:inline-block;width:7px;height:7px;margin:0 1px;border-radius:50%;background:var(--ink-faint);animation:blink 1.2s infinite both}
.typing span:nth-child(2){animation-delay:.2s}.typing span:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,80%,100%{opacity:.25}40%{opacity:1}}

.composer{padding:16px 18px}
.composer.ein-mode .input-row{border-color:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}
.input-row{display:flex;align-items:center;gap:10px;border:1.5px solid var(--line);border-radius:14px;padding:8px 8px 8px 16px;transition:.15s;background:#fff}
.input-row:focus-within{border-color:var(--brand);box-shadow:0 0 0 4px var(--brand-soft)}
.input-row input{flex:1;border:0;outline:0;font-size:16px;font-family:inherit;color:var(--ink);background:transparent;padding:8px 0}
.input-row input::placeholder{color:var(--ink-faint)}
.send-btn{flex:0 0 auto;width:42px;height:42px;border-radius:11px;border:0;background:var(--brand);color:#fff;font-size:18px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:.15s}
.send-btn:hover{background:var(--brand-dark)}
.composer-hint{display:flex;align-items:center;gap:8px;margin-top:11px;font-size:13px;color:var(--ink-faint)}
.composer-hint .ein-flag{color:var(--accent);font-weight:600}
.suggestions{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px;justify-content:center}
.chip{font-size:13.5px;color:var(--ink-soft);background:#fff;border:1px solid var(--line);padding:8px 14px;border-radius:100px;cursor:pointer;transition:.15s}
.chip:hover{border-color:var(--brand);color:var(--brand);background:var(--brand-soft)}

/* EIN start-filing panel */
.ein-panel{margin-top:16px;border:1px solid var(--accent);background:var(--accent-soft);border-radius:14px;padding:18px 20px;animation:rise .3s ease}
.ein-panel h4{font-size:16px;color:var(--ink);margin-bottom:6px;display:flex;align-items:center;gap:8px}
.ein-panel p{margin:0 0 14px;font-size:14.5px;color:var(--ink-soft)}
.ein-panel .ein-display{font-family:"Montserrat",monospace;font-weight:700;color:var(--accent);font-size:18px;letter-spacing:.04em}

/* trust row */
.trust{display:flex;gap:26px;justify-content:center;flex-wrap:wrap;margin:28px 0 6px;color:var(--ink-faint);font-size:13.5px}
.trust span{display:inline-flex;align-items:center;gap:7px}
.trust b{color:var(--ink-soft);font-weight:600}

/* ---------- Columns ---------- */
.section{padding:64px 0}
.section-head{text-align:center;max-width:620px;margin:0 auto 42px}
.section-head h2{font-size:clamp(24px,3vw,34px);font-weight:800;letter-spacing:-.01em}
.section-head p{color:var(--ink-soft);margin-top:12px;font-size:17px}
.cols{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;box-shadow:var(--shadow);transition:.18s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:#cfe0f6}
.card .ico{width:50px;height:50px;border-radius:13px;display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:18px}
.card.c-faq .ico{background:var(--brand-soft);color:var(--brand)}
.card.c-filing .ico{background:var(--accent-soft);color:var(--accent)}
.card.c-pro .ico{background:#f3edff;color:#6d3bd1}
.card.c-start{background:linear-gradient(165deg,#143a85,#1c63e0);border-color:transparent;color:#fff}
.card.c-start .ico{background:rgba(255,255,255,.16);color:#fff}
.card h3{font-size:19px;font-weight:700;margin-bottom:9px}
.card.c-start h3{color:#fff}
.card p{font-size:14.5px;color:var(--ink-soft);margin:0 0 18px;flex:1}
.card.c-start p{color:#dbe7ff}
.card ul{list-style:none;margin:0 0 20px;padding:0}
.card li{font-size:14px;color:var(--ink-soft);padding:7px 0 7px 24px;position:relative;border-top:1px solid var(--line-soft)}
.card li:first-child{border-top:0}
.card li::before{content:"";position:absolute;left:2px;top:14px;width:6px;height:6px;border-radius:50%;background:var(--brand)}
.card.c-filing li::before{background:var(--accent)}
.card.c-pro li::before{background:#6d3bd1}
.card .card-link{font-weight:600;font-size:14.5px;color:var(--brand);display:inline-flex;align-items:center;gap:6px;margin-top:auto}
.card .card-link:hover{gap:9px;text-decoration:none}
.card.c-start .btn{background:#fff;color:var(--brand-dark);margin-top:auto}
.card.c-start .btn:hover{background:#eef3fa}

/* ---------- inline FAQ accordion ---------- */
.faq-band{background:var(--bg-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.faq-list{max-width:780px;margin:0 auto}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:12px;margin-bottom:12px;overflow:hidden}
.faq-item summary{cursor:pointer;list-style:none;padding:18px 22px;font-weight:600;font-size:16px;display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:22px;color:var(--brand);font-weight:400;transition:.2s}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item .body{padding:0 22px 20px;color:var(--ink-soft);font-size:15px}
.faq-item .body p{margin:0 0 10px}.faq-item .body p:last-child{margin:0}
.faq-item .body ul,.faq-item .body ol{margin:8px 0;padding-left:20px}

/* ---------- CTA band ---------- */
.cta-band{padding:64px 0;text-align:center;background:linear-gradient(135deg,#0f2c63,#1c63e0);color:#fff}
.cta-band h2{font-size:clamp(26px,3.4vw,38px);font-weight:800;color:#fff}
.cta-band p{color:#d3e1fb;font-size:18px;margin:14px auto 26px;max-width:560px}
.cta-band .btn-primary{background:#fff;color:var(--brand-dark)}
.cta-band .btn-primary:hover{background:#eef3fa}

/* ---------- Footer ---------- */
.site-footer{background:#0c1828;color:#aebfd6;padding:52px 0 28px;font-size:14px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:34px;padding-bottom:30px;border-bottom:1px solid #1d2c40}
.footer-grid .brand{color:#fff;margin-bottom:12px}
.footer-grid h4{color:#fff;font-size:14px;margin-bottom:14px;font-family:"Inter",sans-serif;font-weight:600}
.footer-grid a{display:block;color:#aebfd6;margin-bottom:9px;font-size:14px}
.footer-grid a:hover{color:#fff;text-decoration:none}
.footer-grid p{color:#7c91ac;line-height:1.6;max-width:300px}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;padding-top:22px;color:#7c91ac;font-size:13px}
.disclaim{max-width:var(--maxw);margin:0 auto;padding:18px 24px 0;color:#64788f;font-size:12.5px}

/* ---------- responsive ---------- */
@media(max-width:980px){
  .cols{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:680px){
  .nav-links{position:fixed;inset:66px 0 auto 0;background:#fff;flex-direction:column;gap:0;padding:8px 0;border-bottom:1px solid var(--line);box-shadow:var(--shadow);display:none}
  .nav-links.show{display:flex}
  .nav-links li{width:100%;text-align:center}.nav-links li a{display:block;padding:13px}
  .nav-toggle{display:flex}
  .cols{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .trust{gap:16px}
  .hero{padding:36px 0 20px}
}