/* =========================================
   RESET & BASE
   ========================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --navy: #1e3a5f;
  --navy-dark: #152d4a;
  --navy-light: #2a4f7c;
  --accent: #2563eb;
  --accent-light: #3b82f6;
  --surface: #f8fafc;
  --white: #ffffff;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-900: #111827;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(30, 58, 95, 0.10);
  --shadow-lg: 0 12px 48px rgba(30, 58, 95, 0.16);
  --transition: 0.2s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  color: var(--gray-900);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { text-decoration: none; color: inherit; }

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

.accent { color: var(--accent); }

/* =========================================
   BUTTONS
   ========================================= */
.btn-primary {
  display: inline-block;
  background: var(--accent);
  color: var(--white);
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  transition: background var(--transition), transform var(--transition);
  cursor: pointer;
  border: none;
}
.btn-primary:hover { background: var(--accent-light); transform: translateY(-1px); }
.btn-primary--lg { padding: 16px 40px; font-size: 1.05rem; }

.btn-outline {
  display: inline-block;
  color: var(--navy);
  border: 2px solid var(--navy);
  padding: 11px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition);
}
.btn-outline:hover { background: var(--navy); color: var(--white); }

.btn-nav {
  background: var(--accent);
  color: var(--white) !important;
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  transition: background var(--transition);
}
.btn-nav:hover { background: var(--accent-light); }

/* =========================================
   NAVIGATION
   ========================================= */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(30, 58, 95, 0.97);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  transition: box-shadow var(--transition);
}

.nav.scrolled { box-shadow: 0 4px 20px rgba(0,0,0,0.3); }

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.nav__logo img {
  height: 56px;
  width: auto;
  filter: brightness(0) invert(1);
}

.nav__links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav__links a {
  color: rgba(255,255,255,0.85);
  font-size: 0.9rem;
  padding: 6px 12px;
  border-radius: 6px;
  transition: color var(--transition), background var(--transition);
}
.nav__links a:hover { color: var(--white); background: rgba(255,255,255,0.08); }

.nav__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav__burger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: all var(--transition);
}

/* =========================================
   SECTIONS
   ========================================= */
.section {
  padding: 96px 0;
}

.section--gray { background: var(--surface); }
.section--navy { background: var(--navy); color: var(--white); }

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 64px;
}

.section-header--light { color: var(--white); }

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(37, 99, 235, 0.1);
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 16px;
}

.section-label--light {
  color: #93c5fd;
  background: rgba(147, 197, 253, 0.15);
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  line-height: 1.25;
  color: var(--gray-900);
  margin-bottom: 16px;
}

.section--navy .section-title,
.section-header--light .section-title { color: var(--white); }

.section-sub {
  font-size: 1.05rem;
  color: var(--gray-500);
  line-height: 1.7;
}

.section--navy .section-sub { color: rgba(255,255,255,0.7); }

/* =========================================
   HERO
   ========================================= */
.hero {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 50%, var(--navy-light) 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 100px 0 64px;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero__badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #93c5fd;
  background: rgba(147, 197, 253, 0.15);
  border: 1px solid rgba(147, 197, 253, 0.3);
  padding: 5px 14px;
  border-radius: 20px;
  margin-bottom: 20px;
}

.hero__title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 24px;
}

.hero__sub {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.75);
  line-height: 1.75;
  margin-bottom: 36px;
  max-width: 520px;
}

.hero__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero__image {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255,255,255,0.12);
}

.hero__image img { width: 100%; height: auto; }

/* =========================================
   PROBLEM / SOLUTION SPLIT
   ========================================= */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
}

.problem-list, .solution-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 24px;
}

.problem-list li, .solution-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--gray-600);
  line-height: 1.6;
}

.icon-x {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #fee2e2;
  color: #dc2626;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  margin-top: 2px;
}

.icon-check {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #dcfce7;
  color: #16a34a;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  margin-top: 2px;
}

/* =========================================
   FEATURES GRID
   ========================================= */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card--wide {
  grid-column: span 2;
}

.feature-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.feature-card__image {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
  background: var(--gray-100);
}

.feature-card--wide .feature-card__image {
  aspect-ratio: 21/9;
}

.feature-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
  transition: transform 0.4s ease;
}

.feature-card:hover .feature-card__image img {
  transform: scale(1.03);
}

.feature-card__overlay {
  position: absolute;
  inset: 0;
  background: rgba(30, 58, 95, 0.65);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}

.feature-card__overlay span {
  color: var(--white);
  font-weight: 600;
  font-size: 0.9rem;
  border: 2px solid var(--white);
  padding: 8px 20px;
  border-radius: var(--radius-sm);
}

.feature-card:hover .feature-card__overlay { opacity: 1; }

.feature-card__body {
  padding: 20px;
}

.feature-card__body h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 8px;
}

.feature-card__body p {
  font-size: 0.875rem;
  color: var(--gray-500);
  line-height: 1.65;
}

/* =========================================
   SECURITY GRID
   ========================================= */
.security-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 16px;
}

.security-item {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius);
  padding: 28px;
}

.security-item__num {
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: #60a5fa;
  margin-bottom: 12px;
}

.security-item h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 10px;
}

.security-item p {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.65);
  line-height: 1.6;
}

/* =========================================
   USE CASES
   ========================================= */
.usecases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.usecase-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 32px;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.usecase-card:hover {
  box-shadow: var(--shadow);
  border-color: var(--accent);
}

.usecase-card__icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.usecase-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 12px;
}

.usecase-card p {
  font-size: 0.9rem;
  color: var(--gray-500);
  line-height: 1.7;
}

/* =========================================
   ARCHITECTURE
   ========================================= */
.arch-diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  margin: 0 auto 56px;
  max-width: 640px;
}

.arch-layer {
  width: 100%;
  display: flex;
  justify-content: center;
}

.arch-arrow {
  font-size: 0.8rem;
  color: var(--gray-400);
  padding: 8px 0;
  font-weight: 600;
}

.arch-split {
  display: flex;
  gap: 24px;
  width: 100%;
  justify-content: center;
}

.arch-branch {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
  max-width: 280px;
}

.arch-box {
  background: var(--white);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 20px 28px;
  text-align: center;
  width: 100%;
  box-shadow: var(--shadow);
}

.arch-box--navy {
  background: var(--navy);
  border-color: var(--navy);
  color: var(--white);
}

.arch-box--accent {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--white);
}

.arch-box__icon { font-size: 1.5rem; margin-bottom: 6px; }
.arch-box__label { font-weight: 700; font-size: 0.95rem; }
.arch-box__sub { font-size: 0.8rem; opacity: 0.75; margin-top: 4px; }
.arch-box--navy .arch-box__label,
.arch-box--accent .arch-box__label { color: var(--white); }

.tech-table {
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  overflow: hidden;
}

.tech-row {
  display: grid;
  grid-template-columns: 160px 200px 1fr;
  border-bottom: 1px solid var(--gray-100);
}

.tech-row:last-child { border-bottom: none; }

.tech-col {
  padding: 14px 20px;
  font-size: 0.9rem;
}

.tech-col--label {
  background: var(--gray-50);
  font-weight: 700;
  color: var(--navy);
  border-right: 1px solid var(--gray-200);
}

.tech-col--value {
  font-weight: 600;
  color: var(--accent);
  border-right: 1px solid var(--gray-100);
}

.tech-col--why { color: var(--gray-500); }

/* =========================================
   BRAND GRID
   ========================================= */
.brand-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.brand-item--wide {
  grid-column: span 2;
}

.brand-item {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--gray-100);
}

.brand-item img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.brand-item--wide img { height: 300px; }

.brand-item:hover img { transform: scale(1.02); }

.brand-item p {
  padding: 12px 16px;
  font-size: 0.82rem;
  color: var(--gray-500);
  text-align: center;
}

/* =========================================
   CTA / CONTACT
   ========================================= */
.cta-block {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.cta-logo {
  height: 80px;
  width: auto;
  margin: 0 auto 32px;
  filter: brightness(0) invert(1);
}

.cta-block h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  color: var(--white);
  margin-bottom: 16px;
  line-height: 1.3;
}

.cta-block p {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.7);
  margin-bottom: 36px;
}

.cta-actions { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }

/* =========================================
   FOOTER
   ========================================= */
.footer {
  background: var(--navy-dark);
  padding: 32px 0;
  border-top: 1px solid rgba(255,255,255,0.06);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer__logo img {
  height: 44px;
  width: auto;
  filter: brightness(0) invert(0.5);
}

.footer__copy {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.35);
}

/* =========================================
   LIGHTBOX
   ========================================= */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0,0,0,0.92);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 40px;
}

.lightbox.open { display: flex; }

.lightbox img {
  max-width: 90vw;
  max-height: 85vh;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  object-fit: contain;
}

.lightbox__close,
.lightbox__prev,
.lightbox__next {
  position: absolute;
  background: rgba(255,255,255,0.12);
  color: var(--white);
  border: none;
  cursor: pointer;
  font-size: 1.4rem;
  border-radius: 50%;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}

.lightbox__close:hover,
.lightbox__prev:hover,
.lightbox__next:hover { background: rgba(255,255,255,0.24); }

.lightbox__close { top: 20px; right: 20px; font-size: 1rem; }
.lightbox__prev { left: 20px; top: 50%; transform: translateY(-50%); font-size: 1.8rem; }
.lightbox__next { right: 20px; top: 50%; transform: translateY(-50%); font-size: 1.8rem; }

/* =========================================
   RESPONSIVE
   ========================================= */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-card--wide { grid-column: span 2; }
  .security-grid { grid-template-columns: repeat(2, 1fr); }
  .brand-grid { grid-template-columns: repeat(2, 1fr); }
  .brand-item--wide { grid-column: span 2; }
}

@media (max-width: 768px) {
  .nav__links { display: none; flex-direction: column; gap: 4px; }
  .nav__links.open {
    display: flex;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--navy-dark);
    padding: 16px 24px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
  }
  .nav__links.open a { padding: 10px 12px; border-radius: 6px; }
  .nav__burger { display: flex; }

  .hero__inner { grid-template-columns: 1fr; text-align: center; gap: 40px; }
  .hero__sub { margin-left: auto; margin-right: auto; }
  .hero__actions { justify-content: center; }
  .hero__image { order: -1; }

  .split { grid-template-columns: 1fr; gap: 40px; }

  .features-grid { grid-template-columns: 1fr; }
  .feature-card--wide { grid-column: span 1; }

  .security-grid { grid-template-columns: 1fr; }

  .usecases-grid { grid-template-columns: 1fr; }

  .arch-split { flex-direction: column; align-items: center; }
  .arch-branch { max-width: 100%; }

  .tech-row { grid-template-columns: 1fr; }
  .tech-col--label { border-right: none; border-bottom: 1px solid var(--gray-200); }
  .tech-col--value { border-right: none; }

  .brand-grid { grid-template-columns: 1fr; }
  .brand-item--wide { grid-column: span 1; }

  .footer__inner { flex-direction: column; text-align: center; }

  .section { padding: 64px 0; }
}

@media (max-width: 480px) {
  .hero { padding: 88px 0 48px; }
  .hero__title { font-size: 1.7rem; }
  .btn-primary--lg { padding: 14px 28px; font-size: 1rem; }
}