/* === Custom Properties === */
:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #0f1520;
  --bg-card: #141c2b;
  --bg-card-hover: #1a2438;
  --text-primary: #eaf0f6;
  --text-secondary: #7a8ba0;
  --accent: #6366f1;
  --accent-light: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.15);
  --border: #1e293b;
  --border-hover: #6366f1;
  --nav-scrolled-bg: rgba(10, 14, 23, 0.85);
  --nav-mobile-bg: rgba(10, 14, 23, 0.97);
  --shadow-dropdown: rgba(0, 0, 0, 0.4);
  --btn-secondary-hover-bg: rgba(255, 255, 255, 0.03);
  --radius: 12px;
  --radius-lg: 16px;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --container: 1120px;
}

/* === Light Mode === */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --accent-light: #4f46e5;
  --accent-glow: rgba(99, 102, 241, 0.1);
  --border: #e2e8f0;
  --nav-scrolled-bg: rgba(248, 250, 252, 0.85);
  --nav-mobile-bg: rgba(248, 250, 252, 0.97);
  --shadow-dropdown: rgba(0, 0, 0, 0.1);
  --btn-secondary-hover-bg: rgba(0, 0, 0, 0.03);
}

/* === Reset === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-light); }
img { max-width: 100%; display: block; }

/* === Container === */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* === Navigation === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  transition: background 0.3s, backdrop-filter 0.3s, padding 0.3s;
}
.nav.scrolled {
  background: var(--nav-scrolled-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
}
.logo-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  height: 34px;
  padding: 0 6px;
  background: var(--accent);
  color: var(--bg-primary);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 16px;
  border-radius: 8px;
  letter-spacing: -1px;
}
.logo-text {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
}
.nav-breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
}
.nav-banglabs {
  font-size: 16px;
  font-weight: 700;
  font-family: var(--font-heading);
  background: linear-gradient(135deg, #c7d2fe, #6366f1, #06b6d4);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-decoration: none;
  transition: opacity 0.2s;
}
.nav-banglabs:hover {
  opacity: 0.8;
}
.breadcrumb-sep {
  color: var(--text-secondary);
  font-size: 18px;
  font-weight: 300;
  opacity: 0.5;
  user-select: none;
}
.nav-links {
  display: flex;
  gap: 28px;
}
.nav-links a {
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text-primary); }
.nav-actions { display: flex; align-items: center; gap: 12px; }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 1px;
  transition: transform 0.3s, opacity 0.3s;
}
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* === Hero === */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
}
.hero-glow {
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(ellipse, rgba(99, 102, 241, 0.08) 0%, transparent 70%);
  pointer-events: none;
}
.hero-inner {
  display: flex;
  justify-content: center;
  align-items: center;
}
.hero-content { position: relative; z-index: 1; text-align: center; max-width: 700px; }
.hero-tagline {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
  line-height: 1.15;
  color: var(--text-primary);
}
.hero-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 40px;
  flex-wrap: wrap;
}
.flow-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 16px 20px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  transition: border-color 0.2s, background 0.2s;
  min-width: 120px;
}
.flow-icon {
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
}
.flow-label {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}
.flow-desc {
  font-size: 12px;
  color: var(--text-secondary);
  white-space: nowrap;
}
.flow-arrow {
  color: var(--accent);
  display: flex;
  align-items: center;
  opacity: 0.5;
}
.hero-get-started {
  margin-top: 32px;
  text-align: center;
}
.get-started-heading {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-bottom: 12px;
}
.hero-platforms {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}
.platform-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}
.platform-tag svg { color: var(--accent); }
a.platform-tag { text-decoration: none; transition: border-color 0.2s, background 0.2s; }
.platform-active { border-color: var(--accent); color: var(--text-primary); }
a.platform-active:hover { background: var(--accent-glow); }
.platform-clarifier {
  font-size: 10px;
  font-family: var(--font-body);
  color: var(--text-secondary);
  opacity: 0.7;
  margin-left: 2px;
}
.hero-ctas {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 32px;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  font-family: var(--font-body);
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
  cursor: pointer;
  border: none;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--accent);
  color: var(--bg-primary);
}
.btn-primary:hover {
  background: var(--accent-light);
  color: var(--bg-primary);
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.25);
}
.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  border-color: var(--text-secondary);
  color: var(--text-primary);
  background: var(--btn-secondary-hover-bg);
}

/* === Sections === */
.section {
  padding: 100px 0;
}
.section-alt {
  background: var(--bg-secondary);
}
.section-header {
  text-align: center;
  margin-bottom: 56px;
}
.section-header h2 {
  font-family: var(--font-heading);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  margin-bottom: 12px;
}
.section-header p {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto;
}

/* === Cards === */
.grid {
  display: grid;
  gap: 20px;
}
.grid-2x2 { grid-template-columns: repeat(2, 1fr); }
.grid-3x2 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
  position: relative;
}
.card:hover {
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow: 0 0 30px var(--accent-glow);
  transform: translateY(-2px);
}
.card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--accent-glow);
  border-radius: 10px;
  color: var(--accent);
  margin-bottom: 20px;
}
.card h3 {
  font-family: var(--font-body);
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}
.card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Card Links */
a.card-link { color: inherit; text-decoration: none; display: block; }
a.card-link h3 { color: var(--text-primary); }
a.card-link p { color: var(--text-secondary); }

/* Badge */
.badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent);
  background: var(--accent-glow);
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 16px;
}

/* === Architecture === */
.arch-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
}
.arch-col { display: flex; flex-direction: column; align-items: center; }
.arch-col-clients { gap: 10px; }
.arch-col-arrow { flex-shrink: 0; }
.arch-col-center { flex-shrink: 0; }
.arch-col-arrow-split {
  flex-shrink: 0;
  gap: 40px;
}
.arch-col-outputs { gap: 16px; }
.arch-node {
  max-width: 240px;
  text-align: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 22px;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.arch-node:hover {
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow: 0 0 30px var(--accent-glow);
}
.arch-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  background: var(--accent-glow);
  border-radius: 12px;
  color: var(--accent);
  margin: 0 auto 14px;
}
.arch-node h3 {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-primary);
}
.arch-node p {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.5;
}
.arch-client {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 160px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.arch-client:hover {
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow: 0 0 20px var(--accent-glow);
}
.arch-client-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  background: var(--accent-glow);
  border-radius: 8px;
  color: var(--accent);
  flex-shrink: 0;
}
.arch-client span {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

/* === Footer === */
.footer {
  border-top: 1px solid var(--border);
  padding: 48px 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}
.footer-tagline {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 8px;
}
.footer-links {
  display: flex;
  gap: 24px;
}
.footer-links a {
  color: var(--text-secondary);
  font-size: 14px;
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--text-primary); }
.footer-copy p {
  font-size: 13px;
  color: var(--text-secondary);
}

/* === Scroll Reveal === */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* === Responsive === */
@media (max-width: 1024px) {
  .hero { min-height: auto; padding: 140px 0 60px; }
  .grid-3x2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .arch-diagram { flex-direction: column; gap: 16px; }
  .arch-col-clients { flex-direction: row; flex-wrap: wrap; justify-content: center; }
  .arch-col-arrow svg, .arch-col-arrow-split svg { transform: rotate(90deg); }
  .arch-col-arrow-split { flex-direction: row; gap: 40px; }
  .arch-col-outputs { flex-direction: row; gap: 16px; flex-wrap: wrap; justify-content: center; }
  .arch-node { max-width: 280px; }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--nav-mobile-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 32px;
    z-index: 90;
  }
  .nav-links.open { display: flex; }
  .nav-links a { font-size: 22px; color: var(--text-primary); }
  .hamburger { display: flex; }
  .hero-tagline { font-size: clamp(28px, 7vw, 40px); }
  .hero-tagline br { display: none; }
  .hero-flow { flex-direction: column; gap: 10px; }
  .flow-step { min-width: unset; width: 200px; padding: 12px 14px; }
  .flow-arrow svg { transform: rotate(90deg); }
  .grid-2x2,
  .grid-3x2,
  .grid-3,
  .grid-2 { grid-template-columns: 1fr; }
  .section { padding: 64px 0; }
  .section-header { margin-bottom: 36px; }
  .footer-inner { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .card { padding: 24px; }
  .hero-ctas { flex-direction: column; align-items: stretch; }
  .btn { justify-content: center; }
}

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  color: var(--text-secondary);
  transition: border-color 0.2s, color 0.2s;
}
.theme-toggle:hover { border-color: var(--text-secondary); color: var(--text-primary); }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle .icon-sun { display: block; }

/* Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }