/* ==========================================================================
   VIETANA GROUP — CORPORATE DESIGN SYSTEM
   Visual Direction: Premium Corporate, Minimal, Deep Navy, Subtle Blue
   ========================================================================== */

:root {
  /* Core Color Palette */
  --color-bg: #FFFFFF;
  --color-bg-subtle: #F8FAFC;
  --color-bg-alt: #F1F5F9;
  
  /* Deep Navy Typography Hierarchy */
  --color-navy-primary: #0A1128;
  --color-navy-deep: #0F172A;
  --color-navy-medium: #1E293B;
  --color-slate-body: #475569;
  --color-slate-muted: #64748B;
  --color-slate-light: #94A3B8;

  /* Logo Blue Accents */
  --color-blue-primary: #1D4ED8;
  --color-blue-accent: #2563EB;
  --color-blue-subtle: #3B82F6;
  --color-blue-light: #EFF6FF;
  --color-blue-tint: rgba(37, 99, 235, 0.08);
  --color-blue-glow: rgba(37, 99, 235, 0.15);

  /* Subtle Warm / Neutral Accents */
  --color-border: #E2E8F0;
  --color-border-subtle: #EDF2F7;
  --color-border-hover: #CBD5E1;

  /* Typography */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-heading: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-editorial: 'Cormorant Garamond', Georgia, serif;

  /* Shadows & Elevations */
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.04), 0 1px 2px rgba(15, 23, 42, 0.02);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.05), 0 1px 3px rgba(15, 23, 42, 0.03);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.07), 0 2px 6px rgba(15, 23, 42, 0.04);
  --shadow-xl: 0 20px 48px rgba(15, 23, 42, 0.09), 0 4px 12px rgba(15, 23, 42, 0.05);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-base: 250ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 400ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Layout Spacing */
  --container-max: 1200px;
  --container-narrow: 840px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
}

/* Base Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-slate-body);
  font-size: 1rem;
  line-height: 1.7;
  overflow-x: hidden;
}

/* Focus styles for Accessibility */
:focus-visible {
  outline: 2px solid var(--color-blue-accent);
  outline-offset: 3px;
}

/* Typography Defaults */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-navy-primary);
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

p {
  color: var(--color-slate-body);
  font-weight: 400;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

ul {
  list-style: none;
}

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

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.container-narrow {
  width: 100%;
  max-width: var(--container-narrow);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section {
  padding-top: 6rem;
  padding-bottom: 6rem;
  position: relative;
}

@media (min-width: 768px) {
  .section {
    padding-top: 8rem;
    padding-bottom: 8rem;
  }
}

.section-subtle {
  background-color: var(--color-bg-subtle);
  border-top: 1px solid var(--color-border-subtle);
  border-bottom: 1px solid var(--color-border-subtle);
}

/* Section Header Typography */
.section-tagline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-blue-primary);
  margin-bottom: 1rem;
}

.section-tagline::before {
  content: '';
  display: inline-block;
  width: 18px;
  height: 2px;
  background-color: var(--color-blue-primary);
  border-radius: 2px;
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--color-navy-primary);
  margin-bottom: 1.25rem;
}

.section-description {
  font-size: clamp(1.05rem, 1.5vw, 1.2rem);
  line-height: 1.65;
  color: var(--color-slate-body);
  max-width: 680px;
}

/* Subtle Architectural Vietnam Line Accent & Coming Soon Watermark */
.vietnam-pattern-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(circle at 1px 1px, var(--color-border) 1px, transparent 0);
  background-size: 40px 40px;
  opacity: 0.45;
  mask-image: radial-gradient(ellipse 60% 60% at 50% 50%, #000 70%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 60% 60% at 50% 50%, #000 70%, transparent 100%);
}

.bg-coming-soon-watermark {
  position: absolute;
  top: 48%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(-8deg);
  font-family: var(--font-heading);
  font-size: clamp(5rem, 14vw, 15rem);
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(10, 17, 40, 0.028);
  white-space: nowrap;
  pointer-events: none;
  user-select: none;
  z-index: 1;
  line-height: 1;
}

.coming-soon-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.45rem 1.15rem;
  background: rgba(37, 99, 235, 0.06);
  border: 1px solid rgba(37, 99, 235, 0.22);
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-blue-primary);
  margin-bottom: 2rem;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 2px 10px rgba(37, 99, 235, 0.05);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: #10B981;
  border-radius: 50%;
  position: relative;
  display: inline-block;
  flex-shrink: 0;
}

.pulse-dot::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background-color: #10B981;
  opacity: 0.5;
  animation: pulse-ring 2.2s cubic-bezier(0.24, 0, 0.38, 1) infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.9); opacity: 0.7; }
  70% { transform: scale(2.4); opacity: 0; }
  100% { transform: scale(2.6); opacity: 0; }
}