/* =========================================================
   Tsystem Pay — Design System (v4 — modern dark glass)
   Palette:  base #0A0A0F · glass surface rgba(255,255,255,.04)
             text #F5F5F7 · muted #8B8D98 · accent violet #7C5CFF → cyan #22D3EE
   Type:     Space Grotesk (display) / Inter (body) / IBM Plex Mono (data)
   ========================================================= */

:root {
  --ink: #0A0A0F;
  --surface: rgba(255,255,255,0.045);
  --surface-raised: rgba(255,255,255,0.075);
  --line: rgba(255,255,255,0.10);
  --line-soft: rgba(255,255,255,0.06);
  --platinum: #F5F5F7;
  --platinum-dim: #C9CAD1;
  --steel: #8B8D98;
  --copper: #7C5CFF;
  --copper-dim: #5F42D9;
  --accent-2: #22D3EE;
  --success: #34D399;

  --header-bg: rgba(10,10,15,0.7);
  --header-line: rgba(255,255,255,0.08);
  --on-header: #F5F5F7;
  --on-header-dim: #9A9CA6;
  --footer-bg: #0D0D13;
  --on-footer: #F5F5F7;
  --on-footer-dim: #9A9CA6;

  --font-display: "Space Grotesk", "Helvetica Neue", sans-serif;
  --font-body: "Inter", -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", "SF Mono", monospace;

  --container: 1180px;
  --radius-s: 10px;
  --radius-m: 18px;
  --radius-l: 26px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--ink);
  background-image:
    radial-gradient(ellipse 1000px 600px at 15% -10%, rgba(124,92,255,0.16), transparent 60%),
    radial-gradient(ellipse 900px 600px at 100% 10%, rgba(34,211,238,0.10), transparent 55%),
    radial-gradient(ellipse 700px 500px at 50% 100%, rgba(124,92,255,0.08), transparent 60%);
  background-attachment: fixed;
  color: var(--platinum);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.wrap {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
}

@media (max-width: 720px) {
  .wrap { padding: 0 20px; }
}

/* ---------- Typography ---------- */

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--platinum);
  letter-spacing: -0.01em;
  line-height: 1.1;
}

h1 { font-size: clamp(2.4rem, 5vw, 4.2rem); font-weight: 500; }
h2 { font-size: clamp(1.8rem, 3vw, 2.6rem); }
h3 { font-size: 1.3rem; }

p { color: var(--steel); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--copper);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--copper);
  display: inline-block;
}

.grad-text {
  background: linear-gradient(135deg, var(--copper), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lede {
  font-size: 1.15rem;
  color: var(--steel);
  max-width: 46ch;
}

.mono-stat {
  font-family: var(--font-mono);
  color: var(--platinum);
}

/* ---------- Header / Nav ---------- */

header.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--header-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--header-line);
}

.site-header .brand { color: var(--on-header); }

.site-header nav.primary-nav a {
  color: var(--on-header-dim);
}
.site-header nav.primary-nav a:hover,
.site-header nav.primary-nav a.active { color: var(--on-header); }

.site-header .nav-cta .btn-ghost {
  background: transparent;
  color: var(--on-header);
  border-color: var(--header-line);
}
.site-header .nav-cta .btn-ghost:hover {
  border-color: var(--on-header-dim);
  background: rgba(255,255,255,0.06);
}

.site-header .nav-toggle {
  color: var(--on-header);
  border-color: var(--header-line);
}

@media (max-width: 1040px) {
  .site-header nav.primary-nav { background: var(--header-bg); border-bottom: 1px solid var(--header-line); }
  .site-header nav.primary-nav a { border-bottom: 1px solid var(--header-line); }
}

.nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--platinum);
}

.brand .mark {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
}

.brand .mark svg { width: 100%; height: 100%; }

nav.primary-nav {
  display: flex;
  align-items: center;
  gap: 26px;
}

nav.primary-nav a {
  font-size: 0.87rem;
  color: var(--steel);
  transition: color 0.2s ease;
  position: relative;
  white-space: nowrap;
}

nav.primary-nav a:hover,
nav.primary-nav a.active { color: var(--platinum); }

nav.primary-nav a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -26px;
  height: 2px;
  background: var(--copper);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 18px;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  width: 40px;
  height: 40px;
  color: var(--platinum);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

@media (max-width: 1040px) {
  nav.primary-nav {
    position: fixed;
    top: 76px; left: 0; right: 0;
    background: var(--ink);
    border-bottom: 1px solid var(--line-soft);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px 20px 20px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: all 0.2s ease;
  }
  nav.primary-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  nav.primary-nav a { padding: 14px 0; width: 100%; border-bottom: 1px solid var(--line-soft); }
  nav.primary-nav a.active::after { display: none; }
  .nav-cta .btn-ghost { display: none; }
  .nav-toggle { display: inline-flex; }
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  white-space: nowrap;
}

.btn:active { transform: scale(0.98); }

.btn-primary {
  background: linear-gradient(135deg, var(--copper), var(--accent-2));
  color: #FFFFFF;
  box-shadow: 0 4px 24px -6px rgba(124,92,255,0.5);
}
.btn-primary:hover {
  box-shadow: 0 6px 32px -4px rgba(124,92,255,0.7);
  transform: translateY(-1px);
}

.btn-ghost {
  background: var(--surface);
  color: var(--platinum);
  border-color: var(--line);
  backdrop-filter: blur(10px);
}
.btn-ghost:hover {
  border-color: rgba(255,255,255,0.22);
  background: var(--surface-raised);
}

.btn-block { width: 100%; }

/* ---------- Sections ---------- */

section { padding: 100px 0; border-bottom: 1px solid var(--line-soft); }
section:last-of-type { border-bottom: none; }
.section-head { max-width: 640px; margin-bottom: 56px; }
.section-head h2 { margin-top: 14px; }
.section-head p { margin-top: 16px; }

@media (max-width: 720px) {
  section { padding: 64px 0; }
}

/* ---------- Cards / Grids ---------- */

.grid {
  display: grid;
  gap: 24px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: 32px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.25), inset 0 1px 0 rgba(255,255,255,0.04);
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.card:hover {
  transform: translateY(-3px);
  border-color: rgba(124,92,255,0.4);
  box-shadow: 0 14px 40px rgba(0,0,0,0.35), 0 0 0 1px rgba(124,92,255,0.15), inset 0 1px 0 rgba(255,255,255,0.06);
}

.card .icon {
  width: 42px; height: 42px;
  margin-bottom: 20px;
  color: var(--copper);
}
.card .icon svg { width: 100%; height: 100%; }

.card h3 { margin-bottom: 10px; }
.card p { font-size: 0.95rem; }

/* ---------- Footer ---------- */

footer.site-footer {
  padding: 64px 0 40px;
  border-top: none;
  background: var(--footer-bg);
  color: var(--on-footer-dim);
}

.site-footer .brand { color: var(--on-footer); }
.site-footer .footer-grid h4 { color: var(--on-footer-dim); }
.site-footer .footer-grid a,
.site-footer .footer-grid p { color: var(--on-footer-dim); }
.site-footer .footer-grid a:hover { color: var(--on-footer); }
.site-footer .footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12);
  color: var(--on-footer-dim);
}
.site-footer .footer-bottom a { color: var(--on-footer-dim); }
.site-footer .footer-bottom a:hover { color: var(--on-footer); }

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 48px;
}

.footer-grid h4 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--steel);
  margin-bottom: 16px;
}

.footer-grid a, .footer-grid p {
  display: block;
  font-size: 0.9rem;
  color: var(--steel);
  margin-bottom: 10px;
}
.footer-grid a:hover { color: var(--platinum); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 28px;
  border-top: 1px solid var(--line-soft);
  font-size: 0.82rem;
  color: var(--steel);
}

@media (max-width: 720px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: column; gap: 14px; text-align: center; }
}

/* ---------- Utility ---------- */

.center { text-align: center; margin-left: auto; margin-right: auto; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-40 { margin-top: 40px; }
.flex { display: flex; align-items: center; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--steel);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 6px 12px;
}
.site-footer .badge {
  color: var(--on-footer-dim);
  border-color: rgba(255,255,255,0.18);
}

.badge .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--success);
}