:root {
  /* Brand Color Palette */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F8F9FA;
  --brand-red-bright: #D5101A;
  --brand-red-deep: #B00D15;
  --brand-red-dark: #82080E;
  --brand-red-tint: #FDF2F2;
  --text-primary: #111827;
  --text-secondary: #4B5563;
  --border-subtle: #E5E7EB;

  /* Terminal & High-Contrast Surfaces */
  --surface-dark: #0D1117;
  --surface-dark-card: #161B22;
  --surface-dark-code: #21262D;
  --border-dark: #30363D;
  --text-dark-primary: #F0F6FC;
  --text-dark-secondary: #8B949E;
  --terminal-green: #3FB950;
  --terminal-amber: #D29922;

  /* Typography Stacks (Native System Fonts Only) */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Elevation & Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-crimson: 0 10px 25px -5px rgba(176, 13, 21, 0.25);

  /* Layout Spacing */
  --container-max: 1200px;
  --nav-height: 72px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-color: var(--bg-primary);
}

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

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

button {
  font-family: inherit;
  font-size: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

/* Skip to Content */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background-color: var(--brand-red-deep);
  color: #FFFFFF;
  padding: 0.75rem 1.5rem;
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: var(--radius-sm);
  z-index: 10000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 1rem;
  outline: 3px solid var(--text-primary);
}

/* Focus Visibility */
:focus-visible {
  outline: 2px solid var(--brand-red-bright);
  outline-offset: 3px;
}

/* Container Utility */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: clamp(1rem, 3vw, 2rem);
  padding-right: clamp(1rem, 3vw, 2rem);
}

/* Section Header Typography */
.section-label {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--brand-red-deep);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.section-label::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  background-color: var(--brand-red-bright);
  border-radius: 50%;
}

.section-title {
  font-size: clamp(1.75rem, 1.25rem + 1.8vw, 2.5rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  text-wrap: balance;
}

.section-intro {
  font-size: clamp(1.05rem, 1rem + 0.25vw, 1.2rem);
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 72ch;
  text-wrap: pretty;
}

/* Decorative Bahrain Flag Serration Dividers */
.bahrain-serration-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 3.5rem 0;
  gap: 1rem;
}

.bahrain-serration-divider .line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-subtle), transparent);
}

.bahrain-serration-svg {
  width: 72px;
  height: 16px;
  color: var(--brand-red-bright);
}

/* Sticky Navigation Header */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  height: var(--nav-height);
  background-color: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 1000;
  transition: background-color var(--transition-normal), box-shadow var(--transition-normal);
}

.header-scrolled {
  box-shadow: var(--shadow-sm);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Brand Lockup */
.brand-link {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  font-weight: 800;
  color: var(--brand-red-deep);
  transition: opacity var(--transition-fast);
}

.brand-link:hover {
  opacity: 0.9;
}

.brand-logo-img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  border-radius: var(--radius-sm);
  background-color: #FFFFFF;
}

.brand-name {
  font-size: 1.0625rem;
  letter-spacing: 0.04em;
  font-weight: 800;
  color: var(--brand-red-deep);
  text-transform: uppercase;
}

/* Desktop Navigation Menu */
.primary-nav {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 1.5vw, 1.75rem);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(0.625rem, 1.1vw, 1.25rem);
  list-style: none;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 0.5rem 0.25rem;
  position: relative;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--brand-red-deep);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background-color: var(--brand-red-bright);
  transition: width var(--transition-normal);
}

.nav-link:hover::after,
.nav-link.active::after,
.nav-link[aria-current="true"]::after {
  width: 100%;
}

.nav-link.active,
.nav-link[aria-current="true"] {
  color: var(--brand-red-deep);
}

/* Header Action CTA */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn-nav-join {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5625rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 700;
  color: #FFFFFF;
  background-color: var(--brand-red-deep);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-nav-join:hover {
  background-color: var(--brand-red-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(176, 13, 21, 0.2);
}

/* Mobile Hamburger Button */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: var(--radius-sm);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  z-index: 1001;
}

.hamburger-line {
  width: 20px;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.hamburger-line:not(:last-child) {
  margin-bottom: 5px;
}

/* Hamburger Active Animation */
.mobile-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}

.mobile-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}