/* ============================================================
   StackVolt marketing site — Modern SaaS
   Palette: navy ink #0A2540 · electric blue #1E6FF0 · teal #31D0AA
   Type: Space Grotesk (display) · Inter (body)
   ============================================================ */

:root {
  --ink: #0A2540;
  --ink-2: #12345B;
  --blue: #1E6FF0;
  --blue-dark: #1558C4;
  --teal: #31D0AA;
  --bg: #F6F9FC;
  --white: #FFFFFF;
  --muted: #55708F;
  --line: #E1E9F2;
  --radius: 14px;
  --shadow: 0 12px 40px rgba(10, 37, 64, 0.10);
  --shadow-sm: 0 4px 16px rgba(10, 37, 64, 0.07);
  --font-display: "Space Grotesk", "Inter", sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
}

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

.wrap { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.center { text-align: center; }

h1, h2, h3 { font-family: var(--font-display); line-height: 1.15; letter-spacing: -0.015em; }
h1 { font-size: clamp(2.4rem, 5vw, 3.6rem); font-weight: 700; }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.4rem); font-weight: 700; }
h3 { font-size: 1.08rem; font-weight: 600; }

.eyebrow {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 14px;
}
.section-lede { max-width: 640px; margin: 16px auto 0; color: var(--muted); font-size: 1.06rem; }

/* ------------------------------ Buttons ------------------------------ */
.btn {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 10px 20px;
  border-radius: 9px;
  border: 1.5px solid transparent;
  transition: background-color .18s ease, color .18s ease, border-color .18s ease, transform .18s ease;
  cursor: pointer;
}
.btn-lg { padding: 14px 28px; font-size: 1.02rem; }
.btn-primary { background: var(--blue); color: var(--white); }
.btn-primary:hover { background: var(--blue-dark); transform: translateY(-1px); }
.btn-outline { border-color: var(--ink); color: var(--ink); background: transparent; }
.btn-outline:hover { background: var(--ink); color: var(--white); }
.btn-ghost { color: var(--ink); }
.btn-ghost:hover { color: var(--blue); }

/* -------------------------------- Nav -------------------------------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; gap: 32px; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark { width: 34px; height: 34px; }
.brand-mark.sm { width: 30px; height: 30px; }
.brand-name { font-family: var(--font-display); font-size: 1.25rem; font-weight: 700; }
.brand-name em { font-style: normal; color: var(--blue); }
.nav-links { display: flex; gap: 26px; margin-left: auto; }
.nav-links a { font-size: 0.93rem; font-weight: 500; color: var(--ink-2); }
.nav-links a:hover { color: var(--blue); }
.nav-cta { display: flex; align-items: center; gap: 10px; }

/* -------------------------------- Hero -------------------------------- */
.hero {
  background:
    radial-gradient(1000px 500px at 85% -10%, rgba(30, 111, 240, 0.10), transparent 60%),
    radial-gradient(700px 400px at -10% 40%, rgba(49, 208, 170, 0.08), transparent 60%),
    var(--bg);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
  padding: 88px 24px 96px;
}
.lede { margin-top: 20px; color: var(--muted); font-size: 1.12rem; max-width: 34em; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 32px; }
.hero-note { margin-top: 22px; font-size: 0.86rem; color: var(--muted); max-width: 32em; }

/* Product mock */
.hero-visual { position: relative; }
.mock {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.mock-top {
  display: flex; align-items: center; gap: 6px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  background: #FBFDFF;
}
.mock-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--line); }
.mock-title { margin-left: 10px; font-size: 0.75rem; font-weight: 600; color: var(--muted); }
.mock-body { display: flex; }
.mock-side {
  width: 52px; padding: 16px 0;
  display: flex; flex-direction: column; align-items: center; gap: 12px;
  background: var(--ink);
}
.mock-nav { width: 22px; height: 22px; border-radius: 6px; background: rgba(255,255,255,0.16); }
.mock-nav.on { background: var(--blue); }
.mock-main { flex: 1; padding: 16px; }
.mock-cards { display: grid; gap: 8px; }
.mock-card {
  display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 10px;
  border: 1px solid var(--line); border-radius: 9px; padding: 9px 12px;
}
.mock-card b { font-size: 0.78rem; font-family: var(--font-display); }
.mock-card span { font-size: 0.72rem; color: var(--muted); }
.tag {
  font-style: normal; font-size: 0.66rem; font-weight: 700;
  padding: 3px 8px; border-radius: 99px; letter-spacing: 0.02em;
}
.tag-green { background: #E5F8EE; color: #157A4E; }
.tag-blue { background: #E8F0FE; color: var(--blue-dark); }
.tag-teal { background: #E2FAF4; color: #0E8A6D; }
.mock-chart {
  display: flex; align-items: flex-end; gap: 7px;
  height: 88px; margin-top: 14px;
  padding: 10px; border: 1px solid var(--line); border-radius: 9px;
}
.mock-chart i {
  flex: 1; height: var(--h);
  background: linear-gradient(180deg, var(--blue) 0%, #7FADF7 100%);
  border-radius: 4px 4px 0 0;
}
.mock-rows { display: grid; gap: 7px; margin-top: 14px; }
.mock-rows span { height: 9px; border-radius: 5px; background: var(--bg); }
.mock-rows span:nth-child(2) { width: 82%; }
.mock-rows span:nth-child(3) { width: 64%; }

.mock-float {
  position: absolute;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 11px;
  box-shadow: var(--shadow-sm);
  padding: 10px 14px;
  display: grid; gap: 1px;
}
.mock-float b { font-size: 0.78rem; font-family: var(--font-display); }
.mock-float span { font-size: 0.7rem; color: var(--muted); }
.mock-float-a { top: -18px; right: -8px; border-left: 3px solid var(--teal); }
.mock-float-b { bottom: -16px; left: -12px; border-left: 3px solid var(--blue); }

/* ----------------------------- Trust strip ---------------------------- */
.strip { border-bottom: 1px solid var(--line); background: var(--white); }
.strip-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; padding: 34px 24px; }
.strip-item b { font-family: var(--font-display); font-size: 1.06rem; display: block; }
.strip-item span { font-size: 0.85rem; color: var(--muted); }

/* -------------------------------- Flow -------------------------------- */
.flow { padding: 96px 0; background: var(--white); }
.flowline {
  list-style: none;
  max-width: 720px;
  margin: 56px auto 0;
  position: relative;
}
.flowline::before {
  content: "";
  position: absolute; left: 11px; top: 10px; bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--blue), var(--teal));
  border-radius: 2px;
}
.flowline li { position: relative; padding: 0 0 34px 46px; }
.flowline li:last-child { padding-bottom: 0; }
.flowline li::before {
  content: "";
  position: absolute; left: 3px; top: 5px;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--white);
  border: 3px solid var(--blue);
}
.flowline li:nth-child(n+5)::before { border-color: var(--teal); }
.flowline b { font-family: var(--font-display); font-size: 1.06rem; display: block; }
.flowline span { color: var(--muted); font-size: 0.95rem; }

/* ------------------------------ Platform ------------------------------ */
.platform { padding: 96px 0; background: var(--bg); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.pillar { margin-top: 64px; }
.pillar-head { display: flex; align-items: baseline; gap: 18px; margin-bottom: 22px; }
.pillar-no {
  font-family: var(--font-display);
  font-weight: 700; font-size: 1.35rem;
  color: var(--blue);
}
.pillar-head p { color: var(--muted); font-size: 1rem; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: transform .18s ease, box-shadow .18s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.card h3 { margin-bottom: 8px; }
.card p { font-size: 0.92rem; color: var(--muted); }

/* ---------------------------- Agent portal ---------------------------- */
.agents { padding: 96px 0; background: var(--ink); color: var(--white); }
.agents .eyebrow { color: var(--teal); }
.agents-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px; align-items: center; }
.agents-copy p { color: #B9C9DC; margin-top: 16px; max-width: 34em; }
.ticks { list-style: none; margin-top: 24px; display: grid; gap: 12px; }
.ticks li { position: relative; padding-left: 30px; color: #DCE7F3; font-size: 0.97rem; }
.ticks li::before {
  content: "";
  position: absolute; left: 0; top: 4px;
  width: 18px; height: 18px; border-radius: 50%;
  background: rgba(49, 208, 170, 0.18);
  border: 2px solid var(--teal);
}
.ticks li::after {
  content: "";
  position: absolute; left: 5px; top: 8px;
  width: 8px; height: 5px;
  border-left: 2px solid var(--teal);
  border-bottom: 2px solid var(--teal);
  transform: rotate(-45deg);
}
.portal-card {
  background: var(--white); color: var(--ink);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
}
.portal-head { display: flex; align-items: center; gap: 12px; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.portal-avatar {
  width: 40px; height: 40px; border-radius: 10px;
  display: grid; place-items: center;
  background: var(--blue); color: var(--white);
  font-family: var(--font-display); font-weight: 700;
}
.portal-head b { font-family: var(--font-display); display: block; font-size: 0.98rem; }
.portal-head span { font-size: 0.78rem; color: var(--muted); }
.portal-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 13px 0; border-bottom: 1px solid var(--line);
  font-size: 0.92rem;
}
.portal-foot { padding-top: 14px; font-size: 0.78rem; color: var(--muted); }

/* ------------------------------ Security ------------------------------ */
.security { padding: 96px 0; background: var(--white); }
.sec-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin-top: 52px; }
.sec-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  border-top: 3px solid var(--blue);
}
.sec-item:nth-child(even) { border-top-color: var(--teal); }
.sec-item h3 { margin-bottom: 8px; }
.sec-item p { color: var(--muted); font-size: 0.95rem; }

/* -------------------------------- FAQ --------------------------------- */
.faq { padding: 96px 0; background: var(--white); border-top: 1px solid var(--line); }
.faq-inner { max-width: 760px; }
.faq-list { margin-top: 44px; display: grid; gap: 12px; }
.faq-list details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: var(--shadow-sm);
}
.faq-list summary {
  cursor: pointer;
  list-style: none;
  padding: 18px 52px 18px 22px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.02rem;
  position: relative;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: "";
  position: absolute; right: 22px; top: 50%;
  width: 9px; height: 9px;
  border-right: 2px solid var(--blue);
  border-bottom: 2px solid var(--blue);
  transform: translateY(-70%) rotate(45deg);
  transition: transform .18s ease;
}
.faq-list details[open] summary::after { transform: translateY(-30%) rotate(-135deg); }
.faq-list details p { padding: 0 22px 20px; color: var(--muted); font-size: 0.95rem; }

/* ------------------------------ Pricing ------------------------------- */
.pricing { padding: 96px 0; background: var(--bg); border-top: 1px solid var(--line); }
.pricing-inner { max-width: 760px; }
.pricing .btn { margin-top: 32px; }

/* ------------------------------ Contact ------------------------------- */
.contact { padding: 96px 0; background: var(--white); border-top: 1px solid var(--line); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.contact-copy p { color: var(--muted); margin-top: 16px; max-width: 30em; }
.contact-cards { display: grid; gap: 16px; }
.contact-card {
  display: grid; gap: 3px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
  box-shadow: var(--shadow-sm);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.contact-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: var(--blue); }
.cc-label {
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--blue);
}
.contact-card b { font-family: var(--font-display); font-size: 1.15rem; }
.cc-hint { font-size: 0.85rem; color: var(--muted); }

/* ------------------------------- Footer ------------------------------- */
.footer { background: var(--ink); color: #B9C9DC; }
.footer-inner {
  display: flex; flex-wrap: wrap; gap: 32px;
  align-items: center; justify-content: space-between;
  padding: 44px 24px 28px;
}
.footer-brand { display: flex; gap: 14px; align-items: center; }
.footer-brand b { font-family: var(--font-display); color: var(--white); display: block; }
.footer-brand span { font-size: 0.85rem; max-width: 30em; display: block; }
.footer-links { display: flex; flex-wrap: wrap; gap: 22px; font-size: 0.9rem; }
.footer-links a:hover { color: var(--white); }
.footer-base {
  padding: 0 24px 28px;
  font-size: 0.78rem; color: #7E94AD;
}

/* ------------------------------- Reveal ------------------------------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn, .card, .contact-card { transition: none; }
}

/* ----------------------------- Responsive ----------------------------- */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; padding: 64px 24px; }
  .hero-visual { max-width: 560px; }
  .cards { grid-template-columns: repeat(2, 1fr); }
  .agents-grid, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .strip-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-links { display: none; }
}
@media (max-width: 620px) {
  .cards { grid-template-columns: 1fr; }
  .sec-grid { grid-template-columns: 1fr; }
  .strip-grid { grid-template-columns: 1fr 1fr; gap: 18px; }
  .mock-float-a { display: none; }
  .btn-lg { width: 100%; text-align: center; }
  .hero-actions { flex-direction: column; }
}