/* GotoAI marketing site — OpenAI-style design system (light, restrained).
 * Tokens per docs/website-product-design.md §6. */
*{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#f7f7f4; --surface:#ffffff; --surface2:#fbfbf9;
  --text:#111111; --muted:#5f625f; --faint:#8a8d88;
  --border:#d9d9d2; --hairline:#e8e8e2;
  --accent:#0b5c4a; --accent-strong:#063d32; --accent-soft:#e7f0ec;
  --primary:#111111; --primary-hover:#000000; --on-primary:#ffffff;
  --success:#188038; --warning:#b26a00; --danger:#b42318;
  --code-bg:#101110; --code-text:#e6e6e3; --code-border:#23241f;
  --max:1200px; --wide:1320px;
  --font-sans:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",Helvetica,Arial,sans-serif;
  --font-mono:"JetBrains Mono",SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}
html{-webkit-text-size-adjust:100%}
body{background:var(--bg);color:var(--text);font-family:var(--font-sans);font-size:17px;line-height:1.6;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
a{color:inherit;text-decoration:none}
a.link{color:var(--accent);font-weight:500}
a.link:hover{color:var(--accent-strong);text-decoration:underline;text-underline-offset:3px}
img{max-width:100%;display:block}
button{font-family:inherit;cursor:pointer}

/* ── layout ── */
.container{width:100%;max-width:var(--max);margin:0 auto;padding:0 40px}
.wide{max-width:var(--wide)}
.section{padding:96px 0}
.section-sm{padding:56px 0}
.section + .section{padding-top:0}
.eyebrow{font-size:14px;font-weight:600;letter-spacing:.02em;color:var(--accent);text-transform:none;margin-bottom:16px}
h1,h2,h3{letter-spacing:-.02em;line-height:1.1;font-weight:600}
.h-hero{font-size:64px;line-height:1.02}
h1,.h1{font-size:48px;line-height:1.08}
h2,.h2{font-size:34px;line-height:1.15}
h3,.h3{font-size:22px;line-height:1.25}
.lead{font-size:19px;color:var(--muted);line-height:1.6}
.muted{color:var(--muted)}
.small{font-size:14px;line-height:1.45}
.center{text-align:center}
.mt8{margin-top:8px}.mt16{margin-top:16px}.mt24{margin-top:24px}.mt40{margin-top:40px}
.maxr{max-width:680px}

/* ── buttons ── */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:11px 20px;
  border-radius:8px;font-size:15px;font-weight:600;border:1px solid transparent;transition:background .15s,border-color .15s,color .15s,transform .15s}
.btn-primary{background:var(--primary);color:var(--on-primary);border-color:var(--primary)}
.btn-primary:hover{background:var(--primary-hover);transform:translateY(-1px)}
.btn-accent{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn-accent:hover{background:var(--accent-strong)}
.btn-outline{background:var(--surface);color:var(--text);border-color:var(--border)}
.btn-outline:hover{border-color:var(--text);background:#fff}
.btn-ghost{background:transparent;color:var(--text);border-color:transparent}
.btn-ghost:hover{background:rgba(17,17,17,.05)}
.btn-sm{min-height:36px;padding:7px 14px;font-size:14px}
.btn-lg{min-height:50px;padding:14px 26px;font-size:16px}
.cta-row{display:flex;gap:12px;flex-wrap:wrap}

/* ── header ── */
.site-header{position:sticky;top:0;z-index:100;background:rgba(247,247,244,.85);backdrop-filter:blur(12px);border-bottom:1px solid var(--hairline)}
.nav{display:flex;align-items:center;gap:8px;height:64px}
.brand{display:flex;align-items:center;gap:9px;font-size:19px;font-weight:700;letter-spacing:-.02em;margin-right:20px}
.brand-dot{width:18px;height:18px;border-radius:5px;background:var(--accent);display:inline-block}
.nav-links{display:flex;align-items:center;gap:2px}
.nav-link{position:relative;padding:9px 12px;border-radius:8px;font-size:15px;font-weight:500;color:var(--muted);display:inline-flex;align-items:center;gap:5px}
.nav-link:hover{color:var(--text);background:rgba(17,17,17,.05)}
.nav-caret{font-size:10px;opacity:.6}
.nav-spacer{flex:1}
.nav-cta{display:flex;align-items:center;gap:8px}
.nav-cta .signin{padding:9px 12px;font-size:15px;font-weight:500;color:var(--text)}
.nav-cta .signin:hover{color:var(--accent)}

/* mega menu */
.has-mega{position:relative}
.mega{position:absolute;top:calc(100% + 8px);left:0;min-width:340px;background:var(--surface);border:1px solid var(--border);border-radius:12px;
  box-shadow:0 12px 32px rgba(0,0,0,.10);padding:10px;opacity:0;visibility:hidden;transform:translateY(6px);transition:opacity .15s,transform .15s;}
.has-mega:hover .mega,.has-mega:focus-within .mega{opacity:1;visibility:visible;transform:translateY(0)}
.mega-item{display:block;padding:10px 12px;border-radius:8px}
.mega-item:hover{background:var(--surface2)}
.mega-item .t{font-size:15px;font-weight:600;color:var(--text)}
.mega-item .d{font-size:13px;color:var(--muted);margin-top:2px}

/* mobile nav */
.menu-btn{display:none;width:40px;height:40px;align-items:center;justify-content:center;border:1px solid var(--border);border-radius:8px;background:var(--surface);font-size:18px}
.mobile-nav{position:fixed;inset:0;z-index:200;background:var(--bg);display:none;flex-direction:column;padding:18px 20px}
.mobile-nav.open{display:flex}
.mobile-nav .m-head{display:flex;align-items:center;justify-content:space-between;height:44px;margin-bottom:16px}
.mobile-nav a{padding:14px 4px;font-size:18px;font-weight:600;border-bottom:1px solid var(--hairline)}
.mobile-nav .m-cta{margin-top:auto;padding-top:20px}

/* ── hero ── */
.hero{padding:72px 0 64px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.proof{display:flex;flex-wrap:wrap;gap:8px 18px;margin-top:28px}
.proof span{display:inline-flex;align-items:center;gap:7px;font-size:14px;color:var(--muted)}
.proof span::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent)}

/* ── code block ── */
.code{position:relative;background:var(--code-bg);border:1px solid var(--code-border);border-radius:10px;overflow:hidden;color:var(--code-text)}
.code-tabs{display:flex;align-items:center;gap:2px;padding:8px 8px 0;border-bottom:1px solid var(--code-border)}
.code-tab{padding:7px 13px;font-size:13px;font-weight:500;color:#9a9c95;background:none;border:none;border-radius:7px 7px 0 0}
.code-tab.active{color:#fff;background:rgba(255,255,255,.06)}
.code-body{position:relative}
.code-body pre{margin:0;padding:18px 18px;overflow-x:auto;font-family:var(--font-mono);font-size:13.5px;line-height:1.65}
.code-copy{position:absolute;top:10px;right:10px;background:rgba(255,255,255,.08);color:#cfd1ca;border:1px solid rgba(255,255,255,.12);
  border-radius:6px;padding:5px 10px;font-size:12px}
.code-copy:hover{background:rgba(255,255,255,.16);color:#fff}
.tok-key{color:#7ee0c0}.tok-str{color:#e8c98b}.tok-com{color:#6b6e66}.tok-fn{color:#9ecbff}

/* ── proof / trust strip ── */
.strip{border-top:1px solid var(--hairline);border-bottom:1px solid var(--hairline);background:var(--surface2)}
.strip-row{display:flex;flex-wrap:wrap;gap:14px 34px;padding:22px 0;align-items:center;justify-content:center}
.strip-row .it{font-size:14px;color:var(--muted);font-weight:500;display:inline-flex;gap:8px;align-items:center}
.strip-row .it b{color:var(--text);font-weight:600}

/* ── feature rows ── */
.feature{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;padding:36px 0}
.feature.flip .f-text{order:2}
.f-text h3{margin-bottom:12px}
.f-bullets{margin-top:18px;display:flex;flex-direction:column;gap:10px}
.f-bullets li{list-style:none;display:flex;gap:10px;font-size:15.5px;color:var(--muted)}
.f-bullets li::before{content:"→";color:var(--accent);font-weight:700}
.f-visual{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:16px;overflow:hidden}

/* ── pillars / cards ── */
.cards{display:grid;gap:16px}
.cards-3{grid-template-columns:repeat(3,1fr)}
.cards-2{grid-template-columns:repeat(2,1fr)}
.card{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:24px}
.card h3{font-size:19px;margin-bottom:8px}
.card p{font-size:15px;color:var(--muted)}

/* ── steps ── */
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
.step{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:18px}
.step .n{width:26px;height:26px;border-radius:7px;background:var(--accent-soft);color:var(--accent-strong);font-weight:700;font-size:13px;display:flex;align-items:center;justify-content:center;margin-bottom:12px}
.step .t{font-size:15px;font-weight:600}
.step .d{font-size:13.5px;color:var(--muted);margin-top:5px}

/* ── pricing ── */
.plans{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;align-items:stretch}
.plan{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:24px;display:flex;flex-direction:column}
.plan.featured{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent)}
.plan .pname{font-size:18px;font-weight:700}
.plan .paud{font-size:13.5px;color:var(--muted);margin-top:4px;min-height:38px}
.plan .price{font-size:30px;font-weight:700;letter-spacing:-.02em;margin:14px 0 4px}
.plan .pstatus{font-size:12px}
.plan ul{list-style:none;margin:16px 0;display:flex;flex-direction:column;gap:9px}
.plan ul li{font-size:14px;color:var(--muted);display:flex;gap:9px}
.plan ul li::before{content:"✓";color:var(--accent);font-weight:700}
.plan .btn{margin-top:auto}

/* matrix table */
.matrix{width:100%;border-collapse:collapse;background:var(--surface);border:1px solid var(--border);border-radius:8px;overflow:hidden}
.matrix th,.matrix td{padding:13px 16px;text-align:left;font-size:14px;border-bottom:1px solid var(--hairline)}
.matrix thead th{background:var(--surface2);font-weight:600;font-size:13px}
.matrix td.yes{color:var(--success);font-weight:600}
.matrix tr:last-child td{border-bottom:none}

/* ── FAQ accordion ── */
.faq{max-width:820px;margin:0 auto}
.faq-item{border-bottom:1px solid var(--border)}
.faq-q{width:100%;text-align:left;background:none;border:none;padding:20px 0;font-size:17px;font-weight:600;display:flex;justify-content:space-between;align-items:center;gap:16px;color:var(--text)}
.faq-q .ic{font-size:20px;color:var(--muted);transition:transform .2s;flex-shrink:0}
.faq-item.open .faq-q .ic{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .25s ease;color:var(--muted);font-size:15.5px}
.faq-item.open .faq-a{max-height:400px}
.faq-a p{padding:0 0 20px}

/* ── badges ── */
.badge{display:inline-flex;align-items:center;gap:6px;padding:3px 9px;border-radius:6px;font-size:12px;font-weight:600;border:1px solid transparent}
.badge-ok{background:var(--accent-soft);color:var(--accent-strong)}
.badge-soon{background:#f3efe6;color:var(--warning)}
.badge-plan{background:#eef0f3;color:#475569}

/* ── trust points ── */
.trust{display:grid;grid-template-columns:repeat(2,1fr);gap:14px 40px}
.trust .tp{display:flex;gap:12px;padding:16px 0;border-top:1px solid var(--hairline)}
.trust .tp .ic{color:var(--accent);font-weight:700}
.trust .tp .t{font-weight:600}
.trust .tp .d{font-size:14px;color:var(--muted);margin-top:3px}

/* ── docs layout ── */
.docs-grid{display:grid;grid-template-columns:240px 1fr;gap:48px;align-items:start}
.docs-nav{position:sticky;top:84px}
.docs-nav .g{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--faint);margin:18px 0 8px}
.docs-nav a{display:block;padding:6px 10px;border-radius:7px;font-size:14.5px;color:var(--muted)}
.docs-nav a:hover{background:rgba(17,17,17,.04);color:var(--text)}
.docs-nav a.active{background:var(--accent-soft);color:var(--accent-strong);font-weight:600}
.prose{max-width:760px}
.prose h1{font-size:38px;margin-bottom:8px}
.prose h2{font-size:26px;margin:36px 0 12px}
.prose h3{font-size:20px;margin:24px 0 10px}
.prose p{margin:12px 0;color:#2a2c29}
.prose ul,.prose ol{margin:12px 0 12px 22px;color:#2a2c29}
.prose li{margin:6px 0}
.prose code{font-family:var(--font-mono);font-size:14px;background:#efefe9;border:1px solid var(--hairline);border-radius:5px;padding:1px 6px}
.prose .code code{background:none;border:none;padding:0}
.prose .meta{font-size:13px;color:var(--faint);margin-bottom:24px}
.callout{border:1px solid var(--border);border-left:3px solid var(--accent);background:var(--surface);border-radius:8px;padding:14px 18px;margin:18px 0;font-size:15px}

/* ── contact form ── */
.form-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:48px;align-items:start}
.field{margin-bottom:16px}
.field label{display:block;font-size:14px;font-weight:600;margin-bottom:6px}
.field input,.field select,.field textarea{width:100%;padding:11px 13px;background:var(--surface);border:1px solid var(--border);border-radius:8px;font-size:15px;font-family:inherit;color:var(--text);outline:none}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.field textarea{min-height:130px;resize:vertical}

/* ── footer ── */
.site-footer{border-top:1px solid var(--border);background:var(--surface2);padding:56px 0 32px;margin-top:40px}
.foot-grid{display:grid;grid-template-columns:1.4fr repeat(4,1fr);gap:32px}
.foot-brand .brand{margin-bottom:12px}
.foot-brand p{font-size:14px;color:var(--muted);max-width:280px}
.foot-col h4{font-size:13px;font-weight:700;color:var(--text);margin-bottom:12px}
.foot-col a{display:block;font-size:14px;color:var(--muted);padding:5px 0}
.foot-col a:hover{color:var(--accent)}
.foot-bottom{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:center;margin-top:40px;padding-top:24px;border-top:1px solid var(--hairline);font-size:13px;color:var(--faint)}

/* announcement */
.announce{background:var(--accent);color:#fff;text-align:center;font-size:13.5px;padding:8px 16px}
.announce a{text-decoration:underline;font-weight:600}

/* CTA band */
.cta-band{background:var(--text);color:#fff;border-radius:14px;padding:56px 48px;text-align:center}
.cta-band h2{color:#fff}
.cta-band p{color:rgba(255,255,255,.7);max-width:560px;margin:12px auto 0}
.cta-band .cta-row{justify-content:center;margin-top:28px}
.cta-band .btn-outline{background:transparent;color:#fff;border-color:rgba(255,255,255,.3)}
.cta-band .btn-outline:hover{border-color:#fff;background:rgba(255,255,255,.08)}
.cta-band .btn-primary{background:#fff;color:#111;border-color:#fff}

/* ── responsive ── */
@media(max-width:980px){
  .hero-grid,.feature,.feature.flip .f-text,.form-grid,.docs-grid{grid-template-columns:1fr}
  .feature.flip .f-text{order:0}
  .cards-3,.plans{grid-template-columns:1fr 1fr}
  .steps{grid-template-columns:1fr 1fr}
  .h-hero{font-size:44px}
  h1,.h1{font-size:36px}
  .docs-nav{position:static;border-bottom:1px solid var(--border);padding-bottom:16px;margin-bottom:8px}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:680px){
  .container{padding:0 20px}
  .section{padding:56px 0}
  .nav-links{display:none}
  .nav-cta .signin{display:none}
  .menu-btn{display:flex}
  .cards-3,.plans,.cards-2,.trust,.steps{grid-template-columns:1fr}
  .h-hero{font-size:36px}
  .matrix{display:block;overflow-x:auto}
  .cta-band{padding:40px 24px}
}

/* language switcher */
.lang-switch{appearance:none;background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:8px 28px 8px 11px;font-size:14px;font-family:inherit;color:var(--text);cursor:pointer;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%235f625f' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 10px center}
.lang-switch:hover{border-color:var(--text)}
.mobile-nav .lang-switch{width:100%}
@media(max-width:680px){.nav-cta .lang-switch{display:none}}