/* =========================================================
   SENTRO — calm, clear, banking-grade
   Brand:
     deep purple   #2B1E5B
     accent purple #6C5CE7
     mint accent   #2EE5B5  (from logo)
     dark gray     #1F2937
     light gray    #F5F7FA
     white         #FFFFFF
   Type: Inter, no decorative weights
   ========================================================= */

:root {
  --c-purple-900: #2B1E5B;
  --c-purple-700: #3a2a7a;
  --c-purple-500: #6C5CE7;
  --c-mint:       #2EE5B5;
  --c-ink:        #1F2937;
  --c-ink-soft:   #4B5563;
  --c-mute:       #6B7280;
  --c-line:       #E5E7EB;
  --c-bg:         #FFFFFF;
  --c-bg-soft:    #F5F7FA;
  --c-bg-soft-2:  #FAFAFD;
  --radius:       14px;
  --radius-lg:    20px;
  --shadow-sm:    0 1px 2px rgba(31,41,55,.06), 0 1px 3px rgba(31,41,55,.04);
  --shadow-md:    0 8px 24px rgba(43,30,91,.08);
  --shadow-lg:    0 24px 60px rgba(43,30,91,.18);
  --maxw:         1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro', 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--c-ink);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ========= Typography ========= */
h1, h2, h3, h4 {
  color: var(--c-purple-900);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
  line-height: 1.18;
}
h1 { font-size: clamp(36px, 5vw, 56px); letter-spacing: -0.02em; }
h2 { font-size: clamp(28px, 3.4vw, 40px); }
h3 { font-size: 18px; }
h4 { font-size: 14px; text-transform: uppercase; letter-spacing: .12em; color: var(--c-purple-900); }

p { margin: 0 0 14px; color: var(--c-ink-soft); }
.lead { font-size: 18px; color: var(--c-ink-soft); max-width: 540px; }

.eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-purple-500);
  background: rgba(108,92,231,.08);
  padding: 6px 10px;
  border-radius: 999px;
  margin-bottom: 14px;
}
.eyebrow-light {
  color: var(--c-mint);
  background: rgba(46,229,181,.12);
}

/* ========= Buttons ========= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  font-weight: 600;
  font-size: 15px;
  padding: 12px 22px;
  border-radius: 12px;
  cursor: pointer;
  transition: transform .15s ease, background .2s ease, color .2s ease, border-color .2s ease, box-shadow .2s ease;
  white-space: nowrap;
}
.btn-sm { padding: 9px 16px; font-size: 14px; }
.btn-block { width: 100%; }
.btn-primary {
  background: var(--c-purple-900);
  color: #fff;
  box-shadow: 0 6px 16px rgba(43,30,91,.18);
}
.btn-primary:hover { background: var(--c-purple-700); transform: translateY(-1px); }
.btn-ghost {
  background: transparent;
  color: var(--c-purple-900);
  border-color: var(--c-line);
}
.btn-ghost:hover { border-color: var(--c-purple-500); color: var(--c-purple-500); }

/* ========= Header ========= */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.85);
  backdrop-filter: saturate(160%) blur(10px);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--c-line);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.brand img { height: 30px; width: auto; }
.primary-nav {
  display: flex; gap: 28px;
  font-size: 14px; font-weight: 500; color: var(--c-ink-soft);
}
.primary-nav a:hover { color: var(--c-purple-500); }

/* ========= Hero ========= */
.hero {
  position: relative;
  background:
    linear-gradient(100deg, rgba(15,11,34,.92) 0%, rgba(43,30,91,.78) 45%, rgba(43,30,91,.30) 75%, rgba(15,11,34,.55) 100%),
    url('assets/hero-bg.jpg') center/cover no-repeat;
  padding: 96px 0 104px;
  overflow: hidden;
  color: #fff;
}
.hero h1, .hero .eyebrow { color: #fff; }
.hero .eyebrow {
  background: rgba(255,255,255,.10);
  border: 1px solid rgba(255,255,255,.16);
  color: #fff;
  backdrop-filter: blur(6px);
}
.hero .lead { color: rgba(255,255,255,.85); }
.hero .hero-trust { color: rgba(255,255,255,.78); }
.hero .btn-ghost {
  color: #fff;
  border-color: rgba(255,255,255,.28);
  background: rgba(255,255,255,.04);
}
.hero .btn-ghost:hover { border-color: var(--c-mint); color: var(--c-mint); }
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 56px;
  align-items: center;
}
.hero-actions { display: flex; gap: 12px; margin: 22px 0 24px; flex-wrap: wrap; }
.hero-trust {
  list-style: none; padding: 0; margin: 0;
  display: flex; gap: 22px; flex-wrap: wrap;
  font-size: 13px; color: var(--c-mute);
}
.hero-trust .dot {
  display: inline-block; width: 7px; height: 7px; border-radius: 50%;
  background: var(--c-mint); margin-right: 8px; transform: translateY(-2px);
}

.hero-visual { position: relative; min-height: 360px; }
.sample-card {
  position: relative; z-index: 2;
  background: rgba(255,255,255,.96);
  border: 1px solid rgba(255,255,255,.6);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: 0 30px 80px rgba(15,11,34,.45), 0 0 0 1px rgba(255,255,255,.05);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  max-width: 420px;
  margin-left: auto;
}
.card-row {
  display: flex; align-items: baseline; justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px dashed var(--c-line);
}
.card-row:last-of-type { border-bottom: none; }
.card-label { color: var(--c-mute); font-size: 14px; }
.card-value { color: var(--c-purple-900); font-weight: 700; font-size: 20px; }
.sample-card .btn { margin-top: 16px; }
.card-foot { font-size: 13px; color: var(--c-mute); margin: 14px 0 0; }
.halo {
  position: absolute; right: -40px; top: -40px;
  width: 320px; height: 320px; border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, rgba(46,229,181,.28), transparent 70%);
  filter: blur(20px);
  z-index: 1;
}

/* ========= Section primitives ========= */
.section { padding: 96px 0; }
.section-soft { background: var(--c-bg-soft); }
.section-dark {
  position: relative;
  background:
    linear-gradient(135deg, rgba(43,30,91,.94), rgba(26,18,64,.92)),
    url('assets/banner-network-cubes.jpg') center/cover no-repeat;
  color: #fff;
  overflow: hidden;
}
.section-dark::after {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(700px 320px at 88% 110%, rgba(46,229,181,.18), transparent 60%),
    radial-gradient(600px 300px at 8% -10%, rgba(108,92,231,.35), transparent 60%);
  pointer-events: none;
}
.section-dark > .container { position: relative; z-index: 1; }
.section-dark h2, .section-dark h3 { color: #fff; }
.section-dark p { color: rgba(255,255,255,.78); }

.section-head { text-align: center; max-width: 720px; margin: 0 auto 48px; }
.section-head p { color: var(--c-mute); }
.section-head-light p { color: rgba(255,255,255,.78); }

.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

/* ========= Feature cards ========= */
.feature {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}
.feature:hover {
  border-color: rgba(108,92,231,.35);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.feature .ico {
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 12px;
  background: rgba(108,92,231,.1);
  color: var(--c-purple-500);
  font-weight: 700;
  margin-bottom: 18px;
  font-size: 18px;
}
.feature p { font-size: 15px; }

/* ========= Audience cards ========= */
.aud-card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}
.aud-card:hover {
  border-color: rgba(108,92,231,.35);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.aud-card h3 { font-size: 17px; margin-bottom: 6px; }
.aud-card p { font-size: 14px; margin: 0; }

/* ========= Stats ========= */
.stats { gap: 16px; }
.stat {
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius);
  padding: 28px;
  text-align: left;
}
.stat-value {
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.01em;
  margin-bottom: 6px;
}
.stat-label { color: rgba(255,255,255,.78); font-size: 14px; }

/* ========= Steps ========= */
.steps {
  list-style: none; padding: 0; margin: 0;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  counter-reset: step;
}
.steps li {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 24px;
  position: relative;
}
.step-num {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--c-purple-500);
}
.steps h3 { font-size: 16px; margin: 8px 0 8px; }
.steps p { font-size: 14px; }

/* ========= Plan example ========= */
.plan-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.plan-card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-md);
}
.plan-row {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 12px 0;
  font-size: 15px;
  color: var(--c-ink);
}
.plan-row strong {
  color: var(--c-purple-900);
  font-size: 22px;
  font-weight: 700;
}
.plan-row-muted { color: var(--c-mute); font-size: 14px; }
.plan-row-muted span:last-child { color: var(--c-ink); font-weight: 600; }
.plan-divider { height: 1px; background: var(--c-line); margin: 8px 0; }
.plan-note { color: var(--c-mute); font-size: 13px; margin-top: 14px; }

/* ========= Quotes ========= */
.quote {
  margin: 0;
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 28px;
  position: relative;
}
.quote::before {
  content: "“";
  position: absolute;
  top: 8px; left: 18px;
  font-size: 56px; line-height: 1;
  color: var(--c-purple-500);
  opacity: .25;
  font-family: Georgia, serif;
}
.quote p { font-size: 16px; color: var(--c-ink); margin-bottom: 12px; }
.quote footer { color: var(--c-mute); font-size: 13px; }

/* ========= Posts ========= */
.post {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 24px;
  display: flex; flex-direction: column; gap: 8px;
}
.post-tag {
  align-self: flex-start;
  font-size: 11px; font-weight: 600;
  letter-spacing: .14em; text-transform: uppercase;
  color: var(--c-purple-500);
  background: rgba(108,92,231,.08);
  padding: 4px 10px; border-radius: 999px;
  margin-bottom: 6px;
}
.post h3 { font-size: 17px; margin: 0; }
.post p { font-size: 14px; }
.link {
  color: var(--c-purple-500);
  font-weight: 600; font-size: 14px;
  margin-top: auto;
}
.link:hover { color: var(--c-purple-900); }

/* ========= CTA ========= */
.section-cta {
  position: relative;
  background:
    radial-gradient(700px 320px at 90% 10%, rgba(46,229,181,.22), transparent 60%),
    linear-gradient(135deg, rgba(43,30,91,.92), rgba(69,48,168,.86)),
    url('assets/banner-purple-wave.jpg') center/cover no-repeat;
  color: #fff;
  padding: 80px 0;
  overflow: hidden;
}
.section-cta > .container { position: relative; z-index: 1; }
.section-cta h2 { color: #fff; max-width: 640px; }
.section-cta p { color: rgba(255,255,255,.82); max-width: 560px; }
.cta {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 40px;
  align-items: center;
}
.cta-actions { display: flex; gap: 12px; flex-wrap: wrap; justify-content: flex-end; }
.store-btn {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  background: #000;
  color: #fff;
  border-radius: 12px;
  padding: 12px 20px;
  border: 1px solid rgba(255,255,255,.18);
  min-width: 160px;
  transition: transform .15s ease, background .2s ease;
}
.store-btn:hover { transform: translateY(-1px); background: #111; }
.store-sub { font-size: 11px; opacity: .8; letter-spacing: .04em; }
.store-name { font-size: 17px; font-weight: 700; }

/* ========= Banner strip (Earth) ========= */
.banner-strip {
  position: relative;
  min-height: 320px;
  display: flex; align-items: center;
  background:
    linear-gradient(90deg, rgba(15,11,34,.86) 0%, rgba(43,30,91,.55) 60%, rgba(15,11,34,.4) 100%),
    url('assets/banner-earth-night.jpg') center/cover no-repeat;
  color: #fff;
  overflow: hidden;
  border-top: 1px solid rgba(255,255,255,.06);
  border-bottom: 1px solid rgba(255,255,255,.06);
}
.banner-strip .container {
  position: relative; z-index: 1;
  padding-top: 56px; padding-bottom: 56px;
  display: grid; grid-template-columns: 1.4fr 1fr; gap: 32px; align-items: center;
}
.banner-strip h2 {
  color: #fff; font-size: clamp(24px, 2.8vw, 32px); margin: 6px 0 8px;
}
.banner-strip p { color: rgba(255,255,255,.78); margin: 0; max-width: 520px; }
.banner-strip .pill-row {
  display: flex; gap: 10px; flex-wrap: wrap; justify-content: flex-end;
}
.banner-strip .pill {
  font-size: 12px; font-weight: 600; letter-spacing: .12em; text-transform: uppercase;
  padding: 8px 14px; border-radius: 999px;
  background: rgba(255,255,255,.08); color: rgba(255,255,255,.9);
  border: 1px solid rgba(255,255,255,.14);
  backdrop-filter: blur(4px);
}

/* ========= Governance subtle banner ========= */
#governance {
  position: relative;
  background:
    linear-gradient(180deg, rgba(255,255,255,.97), rgba(255,255,255,.97)),
    url('assets/banner-blockchain.jpg') right top / 60% auto no-repeat;
}

/* ========= Hero overlay ========= */
.hero > .container { position: relative; z-index: 1; }
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background-image: radial-gradient(rgba(255,255,255,.08) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(180deg, #000 0%, transparent 70%);
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 70%);
  opacity: .6;
  pointer-events: none;
}

/* ========= Footer ========= */
.site-footer {
  background: #0F0B22;
  color: rgba(255,255,255,.7);
  padding: 64px 0 32px;
  font-size: 14px;
}
.site-footer h4 { color: #fff; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: .04em;
  color: #fff;
  margin-bottom: 12px;
  line-height: 1;
}
.footer-tag { color: var(--c-mint); font-weight: 600; margin-bottom: 8px; }
.footer-mute { color: rgba(255,255,255,.55); font-size: 13px; }
.footer-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.footer-list a:hover { color: var(--c-mint); }
.footer-fine {
  border-top: 1px solid rgba(255,255,255,.08);
  padding-top: 24px;
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  color: rgba(255,255,255,.45);
  font-size: 12px;
}

/* ========= Responsive ========= */
@media (max-width: 1024px) {
  .steps { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 760px) {
  .primary-nav { display: none; }
  .hero { padding: 56px 0 64px; }
  .hero-grid, .plan-grid, .cta { grid-template-columns: 1fr; gap: 32px; }
  .cta-actions { justify-content: flex-start; }
  .section { padding: 64px 0; }
  .grid-2, .grid-3, .steps { grid-template-columns: 1fr; }
  .hero-visual { min-height: 0; }
  .sample-card { margin: 0; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-fine { flex-direction: column; }
  .banner-strip .container { grid-template-columns: 1fr; }
  .banner-strip .pill-row { justify-content: flex-start; }
  #governance { background-image: none; }
}