:root { color-scheme: light; --ink:#16221d; --muted:#66736d; --line:#dfe5e1; --paper:#f6f7f3; --green:#1f7651; --soft:#e5efe9; }
* { box-sizing:border-box; }
html { scroll-behavior:smooth; }
body { margin:0; background:var(--paper); color:var(--ink); font:15px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC",sans-serif; }
a { color:inherit; text-decoration:none; }
.site-header { position:sticky; top:0; z-index:3; display:flex; align-items:center; justify-content:space-between; gap:32px; height:68px; padding:0 max(24px,calc((100vw - 1180px)/2)); border-bottom:1px solid rgba(223,229,225,.9); background:rgba(246,247,243,.94); backdrop-filter:blur(12px); }
.brand { display:flex; align-items:center; gap:9px; font-size:19px; font-weight:750; letter-spacing:-.02em; }
.brand span { display:grid; place-items:center; width:28px; height:28px; border-radius:7px; background:var(--green); color:white; font-family:Georgia,serif; }
nav { display:flex; gap:28px; color:var(--muted); font-size:14px; }
nav a:hover { color:var(--ink); }
.quiet-button,.primary-button { display:inline-flex; align-items:center; justify-content:center; min-height:40px; padding:0 17px; border:1px solid #b8c3bd; border-radius:9px; font-weight:650; }
.primary-button { border-color:var(--green); background:var(--green); color:white; }
main,footer { width:min(1180px,calc(100% - 48px)); margin:auto; }
.hero { padding:112px 0 72px; }
.eyebrow,.section-heading>p { margin:0 0 16px; color:var(--green); font-size:12px; font-weight:750; letter-spacing:.14em; text-transform:uppercase; }
h1 { max-width:920px; margin:0; font:500 clamp(46px,6.5vw,82px)/1.08 Georgia,"Songti SC",serif; letter-spacing:-.045em; }
.lead { max-width:720px; margin:28px 0 0; color:var(--muted); font-size:18px; }
.hero-actions { display:flex; align-items:center; gap:20px; margin-top:34px; color:var(--muted); font-size:13px; }
.scope-strip { display:grid; grid-template-columns:repeat(4,1fr); margin-top:84px; border-top:1px solid var(--line); border-bottom:1px solid var(--line); }
.scope-strip span { padding:22px 20px 22px 0; color:var(--muted); }
.scope-strip b { display:block; color:var(--ink); }
.section { padding:92px 0; border-bottom:1px solid var(--line); }
.section-heading { max-width:680px; }
h2 { margin:0; font:500 clamp(32px,4vw,52px)/1.16 Georgia,"Songti SC",serif; letter-spacing:-.035em; }
.workflow { display:grid; grid-template-columns:repeat(4,1fr); gap:1px; margin:52px 0 0; padding:0; list-style:none; background:var(--line); border:1px solid var(--line); }
.workflow li { min-height:250px; padding:28px; background:var(--paper); }
.workflow b { color:var(--green); font-size:12px; }
.workflow h3 { margin:44px 0 12px; font-size:18px; }
.workflow p,.copy { color:var(--muted); }
.split { display:grid; grid-template-columns:1.15fr .85fr; gap:100px; align-items:start; }
.copy { font-size:17px; }
.copy p:first-child { margin-top:0; }
.copy li { margin:8px 0; }
.muted { padding-top:16px; border-top:1px solid var(--line); font-size:14px; }
.docs { display:flex; justify-content:space-between; align-items:end; gap:40px; }
.docs>div { max-width:700px; }
footer { display:flex; justify-content:space-between; padding:36px 0 54px; color:var(--muted); font-size:13px; }
@media (max-width:800px) { nav { display:none; } .hero { padding-top:72px; } .scope-strip,.workflow { grid-template-columns:1fr 1fr; } .split { grid-template-columns:1fr; gap:32px; } }
@media (max-width: 520px) { main,footer { width:min(100% - 32px,1180px); } .site-header { padding:0 16px; } .site-header>.quiet-button { display:none; } .hero-actions,.docs,footer { align-items:flex-start; flex-direction:column; } .scope-strip,.workflow { grid-template-columns:1fr; } h1 { font-size:42px; } }

.secondary-button { display:inline-flex; align-items:center; justify-content:center; min-height:40px; padding:0 17px; border:1px solid #c8d1cc; border-radius:9px; background:#fff; color:var(--ink); font:inherit; font-weight:650; cursor:pointer; }
.quiet-button:hover,.secondary-button:hover { border-color:#8fa097; }
button:disabled,input:disabled { cursor:not-allowed; opacity:.55; }
button:focus-visible,a:focus-visible,input:focus-visible { outline:3px solid rgba(31,118,81,.2); outline-offset:2px; }

.hero { display:grid; grid-template-columns:minmax(0,1.15fr) minmax(340px,.85fr); gap:64px; align-items:center; padding:88px 0 64px; }
.hero h1 { max-width:760px; font-size:clamp(44px,5.4vw,72px); }
.auth-card { padding:28px; border:1px solid var(--line); border-radius:16px; background:#fff; box-shadow:0 20px 55px rgba(22,34,29,.08); }
.auth-card h2 { font:700 25px/1.3 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC",sans-serif; letter-spacing:-.02em; }
.auth-status { margin:10px 0 22px; color:var(--muted); }
.auth-status[data-mode="public"] { color:var(--green); }
.auth-status[data-mode="closed"] { color:#8a5a23; }
.auth-form { display:grid; gap:16px; }
.auth-form label { display:grid; gap:7px; color:#44514b; font-size:13px; font-weight:650; }
.auth-form input { width:100%; min-height:45px; padding:0 13px; border:1px solid #c8d1cc; border-radius:9px; background:#fff; color:var(--ink); font:inherit; }
.auth-form input:focus { border-color:var(--green); }
.auth-code-row { display:grid; grid-template-columns:minmax(0,1fr) auto; gap:10px; align-items:end; }
.auth-code-row .secondary-button { min-height:45px; }
.auth-primary,.auth-google { width:100%; min-height:45px; }
.auth-divider { display:flex; align-items:center; gap:12px; color:#8a958f; font-size:12px; }
.auth-divider::before,.auth-divider::after { content:""; flex:1; height:1px; background:var(--line); }
.auth-help { min-height:24px; margin:0; color:var(--muted); font-size:13px; line-height:1.65; }
.auth-help[data-error="true"] { color:#a63b2b; }
.trust-grid { display:grid; grid-template-columns:repeat(3,1fr); border:1px solid var(--line); }
.trust-card { min-height:150px; padding:25px; border-right:1px solid var(--line); }
.trust-card:last-child { border-right:0; }
.trust-card strong { font-size:16px; }
.trust-card p { margin:12px 0 0; color:var(--muted); }

@media (max-width:900px) {
  .hero { grid-template-columns:1fr; gap:44px; padding-top:72px; }
  .auth-card { max-width:620px; }
  .trust-grid { grid-template-columns:1fr; }
  .trust-card { min-height:auto; border-right:0; border-bottom:1px solid var(--line); }
  .trust-card:last-child { border-bottom:0; }
}

@media (max-width: 520px) {
  .hero { gap:34px; padding-top:56px; }
  .auth-card { padding:22px 18px; border-radius:13px; }
  .auth-code-row { grid-template-columns:1fr; }
  .auth-code-row .secondary-button { width:100%; }
}