/* SentientMail marketing site: brand system.
   Dark, premium, techy, matched to the logo (silver envelope, blue neural
   network, navy field). */

:root {
  --bg: #080a12;
  --bg-2: #0d1020;
  --panel: #12162a;
  --panel-2: #171b33;
  --border: #232842;
  --ink: #eef1f8;
  --ink-dim: #a6adc8;
  --ink-faint: #6b7291;
  --blue: #3d7bff;      /* royal: primary action */
  --cyan: #3ee6d8;      /* electric: accents/glow */
  --violet: #7c5cff;
  --grad: linear-gradient(120deg, #3d7bff 0%, #6f6bff 55%, #3ee6d8 100%);
  --radius: 14px;
  --maxw: 1120px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.center { text-align: center; }

/* subtle ambient glow behind hero */
body::before {
  content: "";
  position: fixed;
  top: -20%; left: 50%; transform: translateX(-50%);
  width: 900px; height: 700px;
  background: radial-gradient(closest-side, rgba(61,123,255,0.18), rgba(62,230,216,0.06) 55%, transparent 75%);
  pointer-events: none; z-index: 0;
}

/* ---------------- nav ---------------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(8,10,18,0.72);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 78px; }
.nav-logo { display: flex; align-items: center; gap: 11px; }
.nav-logo img { height: 46px; width: auto; }
.brand-word { font-size: 30px; font-weight: 700; letter-spacing: -0.01em; color: var(--ink); line-height: 1; }
.brand-word .m { font-weight: 500; color: #9fb4d8; }
.nav-links { display: flex; align-items: center; gap: 26px; }
.nav-links a { color: var(--ink-dim); font-size: 15px; font-weight: 500; }
.nav-links a:hover { color: var(--ink); }
.nav-cta { display: flex; align-items: center; gap: 14px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 20px; border-radius: 10px; font-weight: 600; font-size: 15px;
  border: 1px solid transparent; cursor: pointer; transition: transform .12s ease, box-shadow .2s ease, background .2s ease;
  white-space: nowrap;
}
.btn-primary { background: var(--grad); color: #06101f; box-shadow: 0 6px 26px rgba(61,123,255,0.35); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 10px 32px rgba(61,123,255,0.5); }
.btn-ghost { background: transparent; border-color: var(--border); color: var(--ink); }
.btn-ghost:hover { border-color: var(--blue); background: rgba(61,123,255,0.08); }
.btn-lg { padding: 15px 28px; font-size: 16px; }

/* ---------------- hero ---------------- */
.hero { position: relative; z-index: 1; padding: 76px 0 40px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 40px; align-items: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; letter-spacing: .04em; text-transform: uppercase;
  color: var(--cyan); background: rgba(62,230,216,0.08);
  border: 1px solid rgba(62,230,216,0.25); padding: 6px 12px; border-radius: 100px;
}
.hero h1 {
  font-size: clamp(34px, 5vw, 56px); line-height: 1.08; margin: 20px 0 18px; font-weight: 700;
  letter-spacing: -0.02em;
}
.hero h1 .grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero p.lede { font-size: 19px; color: var(--ink-dim); max-width: 34em; margin: 0 0 30px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-note { margin-top: 16px; color: var(--ink-faint); font-size: 14px; }
.hero-art { display: flex; justify-content: center; }
.hero-art img { filter: drop-shadow(0 24px 60px rgba(61,123,255,0.25)); max-height: 460px; }

/* ---------------- logos strip ---------------- */
.strip { padding: 34px 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); margin-top: 40px; }
.strip p { text-align: center; color: var(--ink-faint); font-size: 13px; letter-spacing: .06em; text-transform: uppercase; margin: 0 0 16px; }
.strip-names { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px 30px; }
.strip-names span { color: var(--ink-dim); font-weight: 600; font-size: 17px; opacity: .8; }

/* ---------------- sections ---------------- */
section { position: relative; z-index: 1; padding: 84px 0; }
.section-head { max-width: 640px; margin: 0 auto 48px; text-align: center; }
.section-head h2 { font-size: clamp(28px, 3.6vw, 40px); margin: 0 0 14px; letter-spacing: -0.02em; }
.section-head p { color: var(--ink-dim); font-size: 18px; margin: 0; }

.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.card {
  background: linear-gradient(180deg, var(--panel), var(--bg-2));
  border: 1px solid var(--border); border-radius: var(--radius); padding: 28px;
  transition: border-color .2s ease, transform .2s ease;
}
.card:hover { border-color: rgba(61,123,255,0.5); transform: translateY(-3px); }
.card .ico { width: 44px; height: 44px; border-radius: 11px; display: grid; place-items: center;
  background: rgba(61,123,255,0.12); border: 1px solid rgba(61,123,255,0.28); margin-bottom: 18px; font-size: 22px; }
.card h3 { margin: 0 0 10px; font-size: 19px; }
.card p { margin: 0; color: var(--ink-dim); font-size: 15px; }

/* feature-split rows */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; align-items: center; }
.split.reverse .split-text { order: 2; }
.split-text h2 { font-size: clamp(26px, 3.2vw, 36px); margin: 0 0 16px; letter-spacing: -0.02em; }
.split-text p { color: var(--ink-dim); font-size: 17px; margin: 0 0 18px; }
.split-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.split-list li { display: flex; gap: 12px; align-items: flex-start; color: var(--ink); font-size: 15px; }
.split-list li::before { content: "→"; color: var(--cyan); font-weight: 700; }
.split-visual {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; font-family: "SF Mono", "JetBrains Mono", ui-monospace, Menlo, monospace; font-size: 13px; line-height: 1.7;
  color: var(--ink-dim); overflow-x: auto;
}
.split-visual .k { color: var(--cyan); }
.split-visual .s { color: #a5d6ff; }
.split-visual .c { color: var(--ink-faint); }
.arrow-badge { display: inline-block; margin: 10px 0; color: var(--violet); font-weight: 700; }

/* ---------------- pricing ---------------- */
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; align-items: stretch; }
.pricing-grid.pricing-4 { grid-template-columns: repeat(4, 1fr); gap: 18px; }
.pricing-4 .plan { padding: 26px 22px; }
.pricing-4 .plan .price { font-size: 36px; }
@media (max-width: 1000px) { .pricing-grid.pricing-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .pricing-grid.pricing-4 { grid-template-columns: 1fr; } }
.plan {
  background: linear-gradient(180deg, var(--panel), var(--bg-2));
  border: 1px solid var(--border); border-radius: var(--radius); padding: 30px; display: flex; flex-direction: column;
}
.plan.featured { border-color: var(--blue); box-shadow: 0 0 0 1px var(--blue), 0 20px 50px rgba(61,123,255,0.18); position: relative; }
.plan.featured::before {
  content: "Most popular"; position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  background: var(--grad); color: #06101f; font-size: 12px; font-weight: 700; padding: 5px 14px; border-radius: 100px;
}
.plan h3 { margin: 0 0 6px; font-size: 20px; }
.plan .desc { color: var(--ink-faint); font-size: 14px; min-height: 40px; margin: 0 0 18px; }
.plan .price { font-size: 42px; font-weight: 700; letter-spacing: -0.02em; }
.plan .price span { font-size: 16px; color: var(--ink-faint); font-weight: 500; }
.plan .price.custom { font-size: 30px; }
.plan ul { list-style: none; padding: 22px 0; margin: 0; display: grid; gap: 11px; flex: 1; border-top: 1px solid var(--border); margin-top: 20px; }
.plan ul li { display: flex; gap: 10px; color: var(--ink-dim); font-size: 15px; }
.plan ul li::before { content: "✓"; color: var(--cyan); font-weight: 700; }
.plan .btn { width: 100%; }

/* ---------------- CTA band ---------------- */
.cta-band { text-align: center; }
.cta-inner {
  background: linear-gradient(120deg, rgba(61,123,255,0.14), rgba(62,230,216,0.10));
  border: 1px solid rgba(61,123,255,0.3); border-radius: 20px; padding: 56px 30px;
}
.cta-inner h2 { font-size: clamp(28px, 3.6vw, 40px); margin: 0 0 14px; }
.cta-inner p { color: var(--ink-dim); font-size: 18px; margin: 0 0 26px; }

/* ---------------- footer ---------------- */
footer { border-top: 1px solid var(--border); padding: 44px 0; margin-top: 40px; position: relative; z-index: 1; }
.foot-grid { display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; }
.foot-lock { display: flex; align-items: center; gap: 9px; }
.foot-lock img { height: 38px; width: auto; opacity: .95; }
.foot-lock .brand-word { font-size: 24px; }
.foot-links { display: flex; gap: 22px; color: var(--ink-faint); font-size: 14px; flex-wrap: wrap; }
.foot-links a:hover { color: var(--ink); }
.foot-copy { color: var(--ink-faint); font-size: 13px; }

/* ---------------- responsive ---------------- */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-art { order: -1; }
  .hero-art img { max-height: 300px; }
  .features, .pricing-grid { grid-template-columns: 1fr; }
  .split, .split.reverse .split-text { grid-template-columns: 1fr; order: 0; }
  .nav-links { display: none; }
}

/* --- Marketing opt-in capture --- */
.optin { margin-top: 34px; }
.optin-lead { color: var(--ink-2, #9fb0c8); font-size: 15px; margin: 0 0 12px; }
.optin-form { display: inline-flex; gap: 10px; flex-wrap: wrap; justify-content: center; }
.optin-form input[type="email"] {
  min-width: 280px; padding: 12px 14px; border-radius: 10px;
  border: 1px solid var(--border, #26334a); background: var(--bg-2, #0d1728);
  color: var(--ink, #e8eef7); font: inherit; font-size: 15px;
}
.optin-form input[type="email"]:focus { outline: 2px solid #3d7bff55; }
.optin-form .hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.optin-done { color: #6fd394; font-size: 15px; margin: 10px 0 0; }
.optin-err { color: #e58a7f; font-size: 15px; margin: 10px 0 0; }

/* ---------------------------------------------------------------
   Support + Help pages
   --------------------------------------------------------------- */

.ilink { color: var(--cyan); text-decoration: none; border-bottom: 1px solid rgba(62,230,216,0.3); }
.ilink:hover { border-bottom-color: var(--cyan); }

/* Support: contact cards */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 18px;
}
.contact-card h3 { margin: 0 0 10px; font-size: 19px; }
.contact-for { color: var(--ink-dim); margin: 0 0 16px; font-size: 15px; }
.contact-addr {
  display: inline-block;
  font-weight: 600;
  font-size: 15px;
  color: var(--cyan);
  word-break: break-all;
  margin: 4px 0 14px;
}
.contact-addr:hover { text-decoration: underline; }
.contact-sla {
  margin: 0 0 10px;
  font-size: 13px;
  color: var(--ink);
  padding: 7px 11px;
  background: rgba(61,123,255,0.10);
  border-left: 2px solid var(--blue);
  border-radius: 0 6px 6px 0;
}
.contact-tip { margin: 0; font-size: 13.5px; color: var(--ink-faint); line-height: 1.65; }

.notice-card { border-left: 3px solid var(--cyan); }
.notice-card h3 { font-size: 19px; }

/* Support: shortcut tiles into the guides */
.help-shortcuts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}
.help-shortcut { display: block; transition: border-color .15s ease, transform .15s ease; }
.help-shortcut:hover { border-color: var(--blue); transform: translateY(-2px); }
.hs-title { display: block; font-weight: 600; margin-bottom: 6px; }
.hs-desc { display: block; font-size: 13.5px; color: var(--ink-faint); line-height: 1.6; }

/* Help: two-column docs layout */
.docs-layout {
  display: grid;
  grid-template-columns: 232px minmax(0, 1fr);
  gap: 48px;
  align-items: start;
}
.docs-toc { position: sticky; top: 92px; }
.docs-toc nav { display: flex; flex-direction: column; gap: 2px; }
.toc-label {
  font-size: 11px;
  letter-spacing: .10em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 10px;
}
.docs-toc a {
  color: var(--ink-dim);
  font-size: 14px;
  padding: 7px 12px;
  border-radius: 8px;
  border-left: 2px solid transparent;
  transition: color .15s ease, background .15s ease, border-color .15s ease;
}
.docs-toc a:hover {
  color: var(--ink);
  background: var(--panel);
  border-left-color: var(--blue);
}

.docs-body { min-width: 0; }
.doc-section { scroll-margin-top: 90px; padding-bottom: 44px; }
.doc-section + .doc-section { border-top: 1px solid var(--border); padding-top: 40px; }
.doc-section h3 { font-size: 24px; margin: 0 0 16px; }
.doc-section p { color: var(--ink-dim); }
.doc-section strong { color: var(--ink); }

.doc-list { color: var(--ink-dim); padding-left: 22px; margin: 16px 0; }
.doc-list li { margin-bottom: 11px; line-height: 1.7; }
.doc-list-num { counter-reset: none; }

.doc-note {
  margin: 22px 0 0;
  padding: 15px 18px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-left: 3px solid var(--blue);
  border-radius: 0 10px 10px 0;
  font-size: 14.5px;
  color: var(--ink-dim);
  line-height: 1.7;
}
.doc-note-warn { border-left-color: #f0a63c; }

/* Help: the two deliverability thresholds */
.doc-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin: 22px 0;
}
.doc-metric {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}
.dm-num {
  display: block;
  font-size: 34px;
  font-weight: 700;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.1;
  margin-bottom: 6px;
}
.dm-label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 8px; }
.dm-desc { display: block; font-size: 13px; color: var(--ink-faint); line-height: 1.6; }

@media (max-width: 860px) {
  .docs-layout { grid-template-columns: 1fr; gap: 26px; }
  .docs-toc { position: static; }
  .docs-toc nav { flex-direction: row; flex-wrap: wrap; gap: 6px; }
  .docs-toc a { border-left: none; border: 1px solid var(--border); font-size: 13px; }
}

/* Narrow phones: the logo plus both CTA buttons overflow the viewport
   (.nav-links is already hidden under 900px, but .nav-cta was never
   handled). Drop the secondary "Sign in" button and tighten the lockup so
   the primary CTA always fits. */
@media (max-width: 560px) {
  .nav-inner { gap: 10px; }
  .nav-cta { gap: 8px; }
  .nav-cta .btn-ghost { display: none; }
  .nav-logo img { width: 30px; }
  .nav-logo .brand-word { font-size: 19px; }
  .wrap { padding: 0 16px; }
}