:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --border: #94a3b8;
  --text: #0f172a;
  --muted: #475569;
  --dim: #64748b;
  --accent: #1e3a8a;
  --green: #16a34a;
  --on-accent: #ffffff;
  --err: #b91c1c;
}
* { margin:0; padding:0; box-sizing:border-box; }
html, body { max-width:100%; overflow-x:hidden; overflow-x:clip; }
body {
  background: var(--bg); color: var(--text);
  font-family: 'IBM Plex Sans', sans-serif;
  min-height: 100vh; font-size: 14px;
}

/* ── Nav ── */
nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 32px; height: 56px;
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.97); backdrop-filter: blur(8px);
  position: sticky; top: 0; z-index: 100;
}
.nav-logo {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px; font-weight: 600; color: var(--accent);
  letter-spacing: 0.5px; text-decoration: none;
}
.nav-logo span { color: var(--muted); }
.nav-right { display: flex; gap: 8px; align-items: center; }
.nav-link { color: var(--muted); font-size: 13px; text-decoration: none; padding: 6px 12px; transition: color .15s; }
.nav-link:hover { color: var(--text); }
.nav-btn {
  background: var(--accent); color: var(--on-accent); border: none;
  font-family: 'IBM Plex Sans', sans-serif; font-weight: 600;
  font-size: 12px; padding: 7px 16px; cursor: pointer;
  text-decoration: none; transition: opacity .15s;
}
.nav-btn:hover { opacity: .85; }

/* ── Hero ── */
.hero {
  text-align: center; padding: 72px 24px 56px;
  border-bottom: 1px solid var(--border);
}
.hero-tag {
  display: inline-block; font-family: 'IBM Plex Mono', monospace;
  font-size: 11px; color: var(--accent); letter-spacing: 2px;
  background: rgba(2,132,199,0.08); border: 1px solid rgba(2,132,199,0.2);
  padding: 4px 12px; margin-bottom: 24px;
}
.hero h1 {
  font-size: clamp(32px, 5vw, 52px); font-weight: 600;
  letter-spacing: -1px; margin-bottom: 16px;
  background: linear-gradient(135deg, var(--text) 60%, var(--muted));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.hero p { color: var(--muted); font-size: 15px; max-width: 480px; margin: 0 auto; line-height: 1.7; }

.plans-wrap { max-width: 900px; margin: 0 auto; padding: 48px 24px 80px; }
@keyframes slideUp { from { opacity:0; transform:translateY(12px); } to { opacity:1; transform:translateY(0); } }

/* ── Toast ── */
.toast { position: fixed; bottom: 24px; right: 24px; padding: 12px 20px; font-size: 12px; font-family: 'IBM Plex Mono', monospace; letter-spacing: .5px; z-index: 9999; animation: slideUp .2s ease; }
.toast.ok  { background: rgba(34,197,94,0.1); border: 1px solid rgba(34,197,94,.3); color: var(--green); }
.toast.err { background: rgba(239,68,68,0.1); border: 1px solid rgba(239,68,68,.3); color: var(--err); }

footer { border-top: 1px solid var(--border); padding: 24px 32px; display: flex; justify-content: space-between; color: var(--muted); font-size: 11px; font-family: 'IBM Plex Mono', monospace; }
  

/* ── Pay as you go ── */
.nav-link.hidden { display:none; }


.payg { border:1px solid var(--border); border-radius:12px; padding:24px; margin-bottom:36px; background:var(--surface); }
.payg-grid { display:grid; grid-template-columns:repeat(auto-fit, minmax(110px, 1fr)); gap:10px; }
.payg-loading { grid-column:1/-1; text-align:center; color:var(--muted); font-family:'IBM Plex Mono', monospace; font-size:11px; }
.payg-btn { background:var(--bg); border:1px solid var(--dim); border-radius:8px; padding:14px 8px; cursor:pointer; font-family:'IBM Plex Mono', monospace; color:var(--text); transition:border-color .15s; }
.payg-btn:hover, .payg-btn:focus { border-color:var(--accent); }
.payg-amt { display:block; font-size:15px; font-weight:700; }
.payg-lbl { display:block; font-size:9px; color:var(--muted); margin-top:2px; }
.payg-later { display:block; margin-top:14px; text-align:center; border:1px dashed var(--dim); border-radius:8px; padding:12px; font-family:'IBM Plex Mono', monospace; font-size:12px; color:var(--text); text-decoration:none; transition:border-color .15s; }
.payg-later:hover, .payg-later:focus { border-color:var(--accent); }
.payg-foot { text-align:center; color:var(--muted); font-size:11px; margin:8px 0 0; }
.payg-foot strong { color:var(--text); }





/* ── Phones ── */
@media (max-width: 700px) {
  nav { padding:0 12px; gap:8px; }
  .nav-right { gap:4px; }
  .nav-link { padding:6px 6px; font-size:12px; white-space:nowrap; }
  .nav-btn { white-space:nowrap; padding:7px 12px; }
  .hero { padding:48px 16px 40px; }
  .plans-wrap { padding:32px 12px 56px; }
  .payg { padding:16px; }
  footer { padding:20px 16px; flex-direction:column; gap:8px; text-align:center; }
}
@media (max-width: 420px) {
  .nav-link.back { display:none; }
}


/* WCAG 2.4.1: pricing skip navigation */
.skip-link {
  position: fixed;
  left: -9999px;
  top: 0;
  z-index: 10000;
  padding: 12px 18px;
  background: #111827;
  color: #fff;
  border: 2px solid #60a5fa;
  border-radius: 0 0 8px 0;
  font: 600 14px/1.3 sans-serif;
  text-decoration: none;
}
.skip-link:focus,
.skip-link:focus-visible {
  left: 0;
  outline: 3px solid #60a5fa;
  outline-offset: 2px;
}