/* ── SENTINEL DESIGN SYSTEM — VERICHAIN WEBSITE ─────────────────────────── */

:root {
  --surface:               #02132b;
  --surface-lowest:        #000e24;
  --surface-low:           #0a1c35;
  --surface-high:          #1a2a43;
  --surface-highest:       #243650;
  --surface-bright:        #293a53;
  --secondary:             #f9bc3d;
  --secondary-container:   #c28c00;
  --tertiary:              #63de8f;
  --error:                 #cf3030;
  --on-background:         #e8edf5;
  --on-surface-variant:    #8a9bb5;
  --outline-variant:       rgba(68, 71, 77, 0.2);
  --gold-gradient:         linear-gradient(135deg, #f9bc3d, #c28c00);
  --ambient-shadow:        0 0 40px rgba(55, 71, 97, 0.08);
  --radius-sm:             0.375rem;
  --radius-md:             0.5rem;
  --radius-lg:             0.75rem;
  --radius-full:           9999px;
  --spacing-xs:            0.5rem;
  --spacing-sm:            1rem;
  --spacing-md:            1.5rem;
  --spacing-lg:            2rem;
  --spacing-xl:            3rem;
  --spacing-2xl:           4rem;
}

/* ── RESET ───────────────────────────────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--surface);
  color: var(--on-background);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── TYPOGRAPHY ──────────────────────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: 'Manrope', sans-serif;
  font-weight: 700;
  line-height: 1.15;
  color: var(--on-background);
}

.hero-title {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  text-align: center;
  width: 100%;
}

.section-title {
  font-size: clamp(1.2rem, 2vw, 1.75rem);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.highlight {
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── LAYOUT ──────────────────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.section {
  padding: var(--spacing-xl) 0;
  background-color: var(--surface);
}

.section-deep { background-color: var(--surface-lowest); }

/* ── NAVBAR ──────────────────────────────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(41, 58, 83, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--outline-variant);
  transition: background 0.3s;
}

.nav-container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-text {
  font-family: 'Manrope', sans-serif;
  font-size: 1.125rem;
  font-weight: 800;
  color: var(--on-background);
  letter-spacing: 0.12em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.nav-links a {
  font-family: 'Inter', sans-serif;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--on-surface-variant);
  text-decoration: none;
  transition: color 0.2s;
  position: relative;
}

.nav-links a:hover { color: var(--on-background); }

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--secondary);
  opacity: 0;
  transition: opacity 0.2s;
}

.nav-links a:hover::after { opacity: 1; }

.btn-nav {
  background: var(--gold-gradient) !important;
  color: var(--surface) !important;
  padding: 0.5rem 1.125rem !important;
  border-radius: var(--radius-sm) !important;
  font-weight: 600 !important;
  transition: opacity 0.2s !important;
}

.btn-nav:hover { opacity: 0.9 !important; }
.btn-nav::after { display: none !important; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--on-background);
  border-radius: 2px;
  transition: 0.3s;
}

.mobile-menu {
  display: none;
  flex-direction: column;
  padding: var(--spacing-sm) var(--spacing-xl);
  border-top: 1px solid var(--outline-variant);
  background: rgba(41, 58, 83, 0.95);
}

.mobile-menu a {
  padding: 0.75rem 0;
  color: var(--on-surface-variant);
  text-decoration: none;
  font-size: 0.9375rem;
  border-bottom: 1px solid var(--outline-variant);
  transition: color 0.2s;
}

.mobile-menu a:hover { color: var(--on-background); }
.mobile-menu.open { display: flex; }

/* ── BUTTONS ─────────────────────────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--gold-gradient);
  color: var(--surface);
  padding: 0.875rem 1.75rem;
  border-radius: var(--radius-sm);
  font-family: 'Inter', sans-serif;
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  min-height: 52px;
  transition: opacity 0.2s, transform 0.1s;
  letter-spacing: -0.01em;
}

.btn-primary:hover { opacity: 0.92; transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--on-background);
  padding: 0.875rem 1.75rem;
  border-radius: var(--radius-sm);
  font-family: 'Inter', sans-serif;
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid var(--outline-variant);
  cursor: pointer;
  min-height: 52px;
  transition: border-color 0.2s;
}

.btn-ghost:hover { border-color: rgba(68, 71, 77, 0.5); }

/* ── HERO ────────────────────────────────────────────────────────────────── */
.hero {
  background-color: var(--surface-lowest);
  padding: calc(64px + var(--spacing-xl)) 0 var(--spacing-xl);
}

.hero-container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.hero-badge {
  display: inline-block;
  background: var(--surface-high);
  color: var(--secondary);
  font-family: 'Inter', sans-serif;
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.375rem 0.875rem;
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-md);
  letter-spacing: 0.02em;
}

.hero-subtitle {
  font-size: 1rem;
  color: var(--on-surface-variant);
  max-width: 560px;
  margin: var(--spacing-sm) 0 var(--spacing-md);
  line-height: 1.7;
  letter-spacing: -0.01em;
  text-align: center;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  justify-content: center;
}

/* ── SECTION HEADER ──────────────────────────────────────────────────────── */
.section-header { margin-bottom: var(--spacing-lg); }

.section-header-center {
  text-align: center;
  width: 100%;
}

.section-tag {
  display: inline-block;
  font-family: 'Inter', sans-serif;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--secondary);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: var(--spacing-xs);
}

.section-subtitle {
  font-size: 0.9375rem;
  color: var(--on-surface-variant);
  margin-top: var(--spacing-xs);
  line-height: 1.6;
  letter-spacing: -0.01em;
}

/* ── SPLIT LAYOUT ────────────────────────────────────────────────────────── */
.split-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: start;
}

.split-left {
  position: sticky;
  top: calc(64px + var(--spacing-md));
}

.split-right {
  padding-left: var(--spacing-xl);
  border-left: 1px solid var(--outline-variant);
}

/* ── PROBLEM SECTION ─────────────────────────────────────────────────────── */
.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--outline-variant);
  margin-bottom: var(--spacing-md);
}

.problem-card {
  background: var(--surface-high);
  padding: var(--spacing-md);
  transition: background 0.2s;
}

.problem-card:hover { background: var(--surface-highest); }

.problem-stat {
  font-family: 'Manrope', sans-serif;
  font-size: 2rem;
  font-weight: 800;
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.03em;
  margin-bottom: 0.2rem;
}

.problem-label {
  font-family: 'Manrope', sans-serif;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--on-background);
  margin-bottom: var(--spacing-xs);
}

.problem-card p {
  font-size: 0.8125rem;
  color: var(--on-surface-variant);
  line-height: 1.6;
}

.problem-statement {
  background: var(--surface-high);
  padding: var(--spacing-md);
  border-left: 3px solid var(--secondary);
}

.problem-statement p {
  font-family: 'Manrope', sans-serif;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--on-background);
  line-height: 1.6;
  letter-spacing: -0.01em;
}

/* ── PLATFORM FEATURES ───────────────────────────────────────────────────── */
.platform-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--outline-variant);
}

.feature-card {
  background: var(--surface-high);
  padding: var(--spacing-md);
  transition: background 0.2s;
}

.feature-card:hover { background: var(--surface-highest); }

.feature-icon {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-xs);
}

.feature-card h3 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--on-background);
}

.feature-card p {
  font-size: 0.8125rem;
  color: var(--on-surface-variant);
  line-height: 1.6;
}

/* ── WHO WE SERVE ────────────────────────────────────────────────────────── */
.who-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--outline-variant);
}

.who-card {
  background: var(--surface-high);
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  transition: background 0.2s;
}

.who-card:hover { background: var(--surface-highest); }

.who-card-highlight {
  background: var(--surface-highest);
  border-top: 3px solid var(--secondary);
}

.who-icon { font-size: 1.75rem; margin-bottom: var(--spacing-xs); }

.who-card h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--on-background);
}

.who-card p {
  font-size: 0.8125rem;
  color: var(--on-surface-variant);
  line-height: 1.6;
  flex: 1;
}

.who-link {
  font-size: 0.8125rem;
  color: var(--secondary);
  text-decoration: none;
  font-weight: 500;
  transition: opacity 0.2s;
  margin-top: var(--spacing-xs);
}

.who-link:hover { opacity: 0.8; }

/* ── BUY SAFE APP ────────────────────────────────────────────────────────── */
.app-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

.app-stat {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: var(--spacing-md);
}

.app-stat-value {
  font-family: 'Manrope', sans-serif;
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

.app-stat-label {
  font-size: 0.9rem;
  color: var(--on-surface-variant);
}

.app-features {
  list-style: none;
  margin: var(--spacing-md) 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.app-features li {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.9rem;
  color: var(--on-surface-variant);
}

.check {
  color: var(--tertiary);
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}

/* ── PHONE MOCKUP ────────────────────────────────────────────────────────── */
.app-visual { display: flex; justify-content: center; }

.phone-mockup {
  width: 260px;
  background: var(--surface-high);
  border-radius: 36px;
  padding: 14px;
  box-shadow: 0 0 60px rgba(249, 188, 61, 0.08);
  border: 1px solid var(--outline-variant);
}

.phone-notch {
  width: 70px;
  height: 20px;
  background: var(--surface-lowest);
  border-radius: 10px;
  margin: 0 auto 10px;
}

.phone-screen {
  background: var(--surface-lowest);
  border-radius: 22px;
  overflow: hidden;
  min-height: 380px;
}

.phone-header {
  background: var(--surface-high);
  padding: 14px;
  text-align: center;
  font-family: 'Manrope', sans-serif;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--on-background);
  border-bottom: 1px solid var(--outline-variant);
}

.scan-result {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
  min-height: 320px;
  gap: 0.6rem;
  background: rgba(99, 222, 143, 0.05);
}

.result-icon-phone {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(99, 222, 143, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  color: var(--tertiary);
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.result-status-phone {
  font-family: 'Manrope', sans-serif;
  font-size: 2rem;
  font-weight: 800;
  color: var(--tertiary);
  letter-spacing: -0.02em;
}

.result-product-phone {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--on-background);
  text-align: center;
  margin-top: 0.25rem;
}

.result-detail-phone {
  font-size: 0.7rem;
  color: var(--on-surface-variant);
  text-align: center;
}

.result-verified-phone {
  font-size: 0.7rem;
  color: var(--tertiary);
  text-align: center;
  margin-top: 0.25rem;
}

/* ── CONTACT ─────────────────────────────────────────────────────────────── */
.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--spacing-lg);
  align-items: start;
}

.contact-form-container {
  background: var(--surface-high);
  padding: var(--spacing-md);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.contact-form label {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--on-surface-variant);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: var(--spacing-sm);
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  background: var(--surface-lowest);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.875rem;
  color: var(--on-background);
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  width: 100%;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  border-color: rgba(249, 188, 61, 0.5);
  box-shadow: 0 0 0 3px rgba(249, 188, 61, 0.08);
}

.contact-form select option { background: var(--surface-high); }

.contact-form .btn-primary {
  margin-top: var(--spacing-sm);
  width: 100%;
}

.form-success {
  display: none;
  color: var(--tertiary);
  font-size: 0.875rem;
  margin-top: var(--spacing-xs);
  text-align: center;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--outline-variant);
}

.contact-card {
  background: var(--surface-high);
  padding: var(--spacing-md);
  transition: background 0.2s;
}

.contact-card:hover { background: var(--surface-highest); }

.contact-card h3 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--on-background);
}

.contact-card p {
  font-size: 0.8125rem;
  color: var(--on-surface-variant);
  line-height: 1.6;
}

/* ── FOOTER ──────────────────────────────────────────────────────────────── */
.footer {
  background: var(--surface-lowest);
  padding: var(--spacing-xl) 0 var(--spacing-md);
  border-top: 1px solid var(--outline-variant);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.footer-logo { display: block; margin-bottom: var(--spacing-xs); }

.footer-tagline {
  font-size: 0.8125rem;
  color: var(--secondary);
  font-style: italic;
  margin-bottom: var(--spacing-xs);
}

.footer-desc {
  font-size: 0.8125rem;
  color: var(--on-surface-variant);
  line-height: 1.6;
}

.footer-links h4 {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--on-background);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-sm);
}

.footer-links a {
  display: block;
  font-size: 0.8125rem;
  color: var(--on-surface-variant);
  text-decoration: none;
  margin-bottom: 0.4rem;
  transition: color 0.2s;
}

.footer-links a:hover { color: var(--secondary); }

.footer-bottom {
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--outline-variant);
  text-align: center;
}

.footer-bottom p {
  font-size: 0.75rem;
  color: var(--on-surface-variant);
}

/* ── SCROLL REVEAL ───────────────────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.visible { opacity: 1; transform: translateY(0); }

/* ── RESPONSIVE ──────────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .split-layout { grid-template-columns: 1fr; gap: var(--spacing-xl); }
  .split-left { position: static; }
  .split-right { padding-left: 0; border-left: none; border-top: 1px solid var(--outline-variant); padding-top: var(--spacing-xl); }
  .who-grid { grid-template-columns: repeat(2, 1fr); }
  .platform-features { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .problem-grid { grid-template-columns: 1fr; }
  .who-grid { grid-template-columns: repeat(2, 1fr); }
  .app-section { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--spacing-md); }
}

@media (max-width: 480px) {
  .container { padding: 0 var(--spacing-sm); }
  .hero-container { padding: 0 var(--spacing-sm); }
  .hero-buttons { flex-direction: column; align-items: center; }
  .footer-grid { grid-template-columns: 1fr; }
  .platform-features { grid-template-columns: 1fr; }
  .who-grid { grid-template-columns: 1fr; }
}

/* ── CONTACT SIMPLE ──────────────────────────────────────────────────────── */
.contact-simple {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--spacing-xl) 0;
  max-width: 480px;
  margin: 0 auto;
  gap: var(--spacing-sm);
}

.contact-email {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: var(--spacing-sm);
  font-family: 'Manrope', sans-serif;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--secondary);
  text-decoration: none;
  padding: 1rem 2rem;
  border: 1px solid rgba(249, 188, 61, 0.3);
  border-radius: var(--radius-sm);
  transition: background 0.2s, border-color 0.2s;
}

.contact-email:hover {
  background: rgba(249, 188, 61, 0.06);
  border-color: rgba(249, 188, 61, 0.6);
}

.contact-email-icon {
  font-size: 1.125rem;
}