/* ===================================
   MeshCore - CSS Design System
   =================================== */

/* --- CSS Custom Properties --- */
:root {
  /* Colors - Professional Dark Theme */
  --color-bg-primary: #0d1117;
  --color-bg-secondary: #161b22;
  --color-bg-tertiary: #1c2128;
  --color-bg-card: rgba(22, 27, 34, 0.8);
  --color-bg-glass: rgba(255, 255, 255, 0.03);

  /* Gradients - More Subtle */
  --gradient-primary: linear-gradient(135deg, #2ea043 0%, #1f6feb 100%);
  --gradient-accent: linear-gradient(135deg, #58a6ff 0%, #1f6feb 100%);
  --gradient-overlay: linear-gradient(180deg, rgba(13, 17, 23, 0) 0%, rgba(13, 17, 23, 0.95) 100%);

  /* Text Colors */
  --color-text-primary: #e6edf3;
  --color-text-secondary: #8b949e;
  --color-text-muted: #6e7681;
  --color-accent: #58a6ff;
  --color-accent-secondary: #2ea043;
  --color-accent-hover: #79c0ff;

  /* Border Colors */
  --color-border: #30363d;
  --color-border-muted: #21262d;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-base: 16px;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;
  --font-size-4xl: 3.5rem;

  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.3);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Layout */
  --max-width: 1200px;
  --nav-height: 80px;
}

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

html {
  scroll-behavior: smooth;
  font-size: var(--font-size-base);
}

body {
  font-family: var(--font-family);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* --- Typography --- */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--font-size-4xl);
  color: var(--color-text-primary);
  font-weight: 800;
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--font-size-3xl);
  color: var(--color-text-primary);
}

h3 {
  font-size: var(--font-size-2xl);
  color: var(--color-text-primary);
  font-weight: 600;
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
  font-size: var(--font-size-lg);
}

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

a:hover {
  color: var(--color-accent-hover);
}

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(13, 17, 23, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: all var(--transition-base);
}

.navbar.scrolled {
  box-shadow: var(--shadow-lg);
}

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

.nav-logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

.nav-link {
  color: var(--color-text-secondary);
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-accent);
  background: var(--color-bg-glass);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 80%;
  height: 2px;
  background: var(--gradient-primary);
  transition: transform var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: translateX(-50%) scaleX(1);
}

/* Hamburger Menu */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  z-index: 1001;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background: var(--color-accent);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* --- Sections --- */
section {
  min-height: 100vh;
  padding: calc(var(--nav-height) + var(--spacing-3xl)) var(--spacing-lg) var(--spacing-3xl);
  display: flex;
  align-items: center;
  justify-content: center;
}

.container {
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
}

/* --- Glass Card Component --- */
.glass-card {
  background: var(--color-bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-xl);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
  transition: all var(--transition-base);
}

.glass-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.4);
  border-color: var(--color-accent);
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-lg);
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  border: none;
  text-align: center;
}

.btn-primary {
  background: var(--gradient-accent);
  color: white;
  box-shadow: 0 2px 8px rgba(31, 111, 235, 0.3);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(31, 111, 235, 0.4);
  color: white;
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--color-accent);
  color: var(--color-accent);
}

.btn-outline:hover {
  background: var(--color-accent);
  color: var(--color-bg-primary);
}

/* --- Hero Section --- */
#home {
  background: linear-gradient(rgba(13, 17, 23, 0.8), rgba(13, 17, 23, 0.9)),
    url('hero-bg.png');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  position: relative;
}

.hero-content {
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.hero-title {
  margin-bottom: var(--spacing-lg);
  animation: fadeInUp 0.8s ease;
}

.hero-text {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-xl);
  animation: fadeInUp 0.8s ease 0.2s both;
}

.key-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.fact-card {
  animation: fadeInUp 0.8s ease 0.4s both;
}

.fact-icon {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-sm);
}

/* --- Map Section --- */
.map-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.map-container {
  width: 100%;
  height: 600px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.map-container iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* --- Hardware Grid --- */
.hardware-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

/* --- FAQ Section --- */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.faq-item {
  padding: var(--spacing-lg);
}

.faq-item h4 {
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
}

/* --- Animations --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
}

/* --- Section Backgrounds --- */
/* Map: Global Network Grid */
#map {
  position: relative;
  background-color: var(--color-bg-primary);
  background-image:
    linear-gradient(rgba(13, 17, 23, 0.4), rgba(13, 17, 23, 0.6)),
    radial-gradient(circle, rgba(88, 166, 255, 0.3) 1px, transparent 1px);
  background-size: 100% 100%, 40px 40px;
}

/* Firmware: Digital Data Stream */
#firmware {
  position: relative;
  background-color: var(--color-bg-secondary);
  background-image:
    linear-gradient(rgba(22, 27, 34, 0.5), rgba(22, 27, 34, 0.6)),
    repeating-linear-gradient(0deg, transparent, transparent 19px, rgba(46, 160, 67, 0.25) 20px);
}

/* FAQ: Abstract Knowledge */
#faq {
  position: relative;
  background-color: var(--color-bg-primary);
  background-image:
    linear-gradient(180deg, rgba(13, 17, 23, 0.5) 0%, rgba(13, 17, 23, 0.7) 100%),
    radial-gradient(circle at 100% 0%, rgba(88, 166, 255, 0.25) 0%, transparent 40%),
    radial-gradient(circle at 0% 100%, rgba(46, 160, 67, 0.25) 0%, transparent 40%);
}

/* Hardware: Technical Structure */
#hardware {
  position: relative;
  background-color: var(--color-bg-secondary);
  background-image:
    linear-gradient(rgba(22, 27, 34, 0.5), rgba(22, 27, 34, 0.6)),
    repeating-linear-gradient(45deg, rgba(255, 255, 255, 0.1) 0px, rgba(255, 255, 255, 0.1) 1px, transparent 1px, transparent 12px);
}

/* Community / Contact: Mesh Connections */
#contact {
  position: relative;
  background-color: var(--color-bg-primary);
  background-image:
    linear-gradient(rgba(13, 17, 23, 0.5), rgba(13, 17, 23, 0.7)),
    radial-gradient(circle at center, rgba(88, 166, 255, 0.25) 2px, transparent 2px);
  background-size: 100% 100%, 60px 60px;
}

/* --- Responsive Design --- */
@media (max-width: 768px) {
  :root {
    --font-size-4xl: 2.5rem;
    --font-size-3xl: 2rem;
    --font-size-2xl: 1.5rem;
    --spacing-3xl: 3rem;
  }

  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(10, 14, 26, 0.98);
    backdrop-filter: blur(10px);
    padding: var(--spacing-lg);
    gap: var(--spacing-sm);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }

  .nav-menu.active {
    transform: translateX(0);
  }

  .hamburger {
    display: flex;
  }

  section {
    padding: calc(var(--nav-height) + var(--spacing-xl)) var(--spacing-md) var(--spacing-xl);
  }

  .key-facts {
    grid-template-columns: 1fr;
  }

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

  .map-container {
    height: 400px;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .key-facts {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* --- Utility Classes --- */
.text-center {
  text-align: center;
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}