@import url('https://fonts.googleapis.com/css2?family=Inter:wght@600&family=Roboto:wght@400&display=swap');

:root {
  /* Colors — from brand manifest */
  --color-primary: #2E8DD6;
  --color-secondary: #5B7EA1;
  --color-accent: #5EEAD4;
  --color-background: #1D1F26;
  --color-text: #F0F2F5;

  /* Typography — from brand manifest */
  --font-heading: 'Inter', sans-serif;
  --font-body: 'Roboto', sans-serif;
  --font-heading-weight: 600;
  --font-body-weight: 400;

  /* Spacing */
  --spacing-unit: 0.5rem;
  --spacing-xs: calc(var(--spacing-unit) * 0.5);   /* 0.25rem */
  --spacing-sm: var(--spacing-unit);             /* 0.5rem */
  --spacing-md: calc(var(--spacing-unit) * 1.5); /* 0.75rem */
  --spacing-lg: calc(var(--spacing-unit) * 2);   /* 1rem */
  --spacing-xl: calc(var(--spacing-unit) * 3);   /* 1.5rem */
  --spacing-2xl: calc(var(--spacing-unit) * 4);  /* 2rem */
  --spacing-3xl: calc(var(--spacing-unit) * 6);  /* 3rem */
  --spacing-4xl: calc(var(--spacing-unit) * 8);  /* 4rem */
  --spacing-5xl: calc(var(--spacing-unit) * 10); /* 5rem */
  --spacing-6xl: calc(var(--spacing-unit) * 12); /* 6rem */
  --spacing-8xl: calc(var(--spacing-unit) * 16); /* 8rem */
  --spacing-10xl: calc(var(--spacing-unit) * 20);/* 10rem */

  --section-padding: clamp(4rem, 10vw, 8rem) 0;
  --container-max-width: 1440px;
  --content-max-width: 960px;

  /* Typography Scale */
  --font-size-h1: clamp(2.75rem, 6vw + 1rem, 4.5rem);
  --font-size-h2: clamp(2.25rem, 4.5vw + 1rem, 3.5rem);
  --font-size-h3: clamp(1.875rem, 3.5vw + 1rem, 2.75rem);
  --font-size-h4: clamp(1.5rem, 2.5vw + 1rem, 2.25rem);
  --font-size-h5: clamp(1.25rem, 2vw + 0.5rem, 1.75rem);
  --font-size-h6: clamp(1rem, 1.5vw + 0.5rem, 1.25rem);
  --font-size-body-large: clamp(1.125rem, 1.5vw + 0.5rem, 1.25rem);
  --font-size-body-base: clamp(1rem, 1.25vw + 0.5rem, 1.125rem);
  --font-size-body-small: clamp(0.875rem, 1vw + 0.25rem, 1rem);

  /* Line Heights */
  --line-height-heading: 1.15;
  --line-height-body: 1.75;
  --line-height-tight: 1.25;

  /* Letter Spacing */
  --letter-spacing-heading: -0.02em;
  --letter-spacing-body: 0em;
  --letter-spacing-caption: 0.01em;

  /* Border Radius */
  --border-radius-base: 0.75rem;

  /* Shadow Style */
  --shadow-base: 0 8px 30px hsla(209, 66%, 59%, 0.15), 0 4px 12px hsla(209, 66%, 59%, 0.08);

  /* Gradients */
  --gradient-primary-cta: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  --gradient-subtle-background-glow: radial-gradient(circle at center, hsla(209, 66%, 59%, 0.15) 0%, transparent 70%);
  --gradient-card-header: linear-gradient(to right, hsla(209, 66%, 59%, 0.1) 0%, transparent 100%);

  /* Motion */
  --motion-micro-duration: 180ms;
  --motion-section-duration: 500ms;
  --motion-timing-function: cubic-bezier(0.23, 1, 0.32, 1);
  --motion-stagger-delay: 80ms;
}

/* CSS Reset/Normalize */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px; /* Base for rem units */
}

body {
  font-family: var(--font-body);
  font-weight: var(--font-body-weight);
  color: var(--color-text);
  background-color: var(--color-background);
  line-height: var(--line-height-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  position: relative;
  overflow-x: hidden; /* Prevent horizontal scroll from gradients */

  /* Background texture and glow */
  background-image: url("data:image/svg+xml,%3Csvg width='6' height='6' viewBox='0 0 6 6' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%239C92AC' fill-opacity='0.1' fill-rule='evenodd'%3E%3Cpath d='M9 10LY1v2h2v-2z'/%3E%3C/g%3E%3C/svg%3E"),
                    radial-gradient(ellipse at bottom right, hsla(209, 66%, 59%, 0.08) 0%, transparent 60%);
  background-repeat: repeat, no-repeat;
  background-size: 6px 6px, 100% 100%; /* Apply noise texture and radial gradient */
  background-attachment: fixed;
}

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

input, button, textarea, select {
  font: inherit;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--motion-micro-duration) var(--motion-timing-function),
              text-decoration-color var(--motion-micro-duration) var(--motion-timing-function);
}

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

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  line-height: var(--line-height-heading);
  letter-spacing: var(--letter-spacing-heading);
  color: var(--color-text);
  margin-bottom: var(--spacing-lg);
}

h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }
h4 { font-size: var(--font-size-h4); }
h5 { font-size: var(--font-size-h5); }
h6 { font-size: var(--font-size-h6); }

/* Paragraphs */
p {
  font-size: var(--font-size-body-base);
  margin-bottom: var(--spacing-lg);
}

/* Buttons */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--border-radius-base);
  font-size: var(--font-size-body-base);
  font-weight: var(--font-heading-weight);
  cursor: pointer;
  border: none;
  transition: all var(--motion-micro-duration) var(--motion-timing-function);
  text-align: center;
  white-space: nowrap;
}

.button-primary {
  background: var(--gradient-primary-cta);
  color: var(--color-background); /* Ensures contrast on gradient */
  box-shadow: var(--shadow-base);
}

.button-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px hsla(209, 66%, 59%, 0.25), 0 6px 18px hsla(209, 66%, 59%, 0.15);
}

.button-secondary {
  background-color: var(--color-secondary);
  color: var(--color-text);
  border: 1px solid var(--color-secondary);
}

.button-secondary:hover {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.button-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.button-outline:hover {
  background-color: var(--color-primary);
  color: var(--color-background);
  transform: translateY(-2px);
}

/* Layout Utilities */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.section {
  padding: var(--section-padding);
  position: relative;
  z-index: 1; /* Ensure content is above background effects */
}

.hero {
  min-height: 80vh; /* Or adjust as needed for content */
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--section-padding);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80vw;
  height: 80vw;
  background: var(--gradient-subtle-background-glow);
  border-radius: 50%;
  filter: blur(80px); /* Soften the glow */
  opacity: 0.5;
  z-index: 0;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: var(--content-max-width);
}

.grid {
  display: grid;
  grid-template-columns: repeat(1, minmax(0, 1fr)); /* Mobile-first: single column */
  gap: var(--spacing-3xl);
}

.flex {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
  flex-wrap: wrap; /* Allow wrapping on smaller screens */
}

.flex-column {
  flex-direction: column;
}

.flex-justify-center {
  justify-content: center;
}

.flex-align-center {
  align-items: center;
}

/* Specific component styling */
.card {
  background: rgba(46, 141, 214, 0.05); /* Subtle glassmorphism */
  backdrop-filter: blur(4px);
  border-radius: var(--border-radius-base);
  border: 1px solid hsla(209, 66%, 59%, 0.1);
  padding: var(--spacing-2xl);
  box-shadow: 0 4px 15px hsla(209, 66%, 59%, 0.05);
  transition: transform var(--motion-micro-duration) var(--motion-timing-function),
              box-shadow var(--motion-micro-duration) var(--motion-timing-function);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-base);
}

/* Navigation */
.main-nav {
  position: sticky; /* sticky instead of fixed for better mobile scroll behavior with full-height sections */
  top: 0;
  width: 100%;
  background-color: rgba(29, 31, 38, 0.8); /* Semi-transparent background */
  backdrop-filter: blur(8px); /* Glassmorphism effect */
  z-index: 1000;
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid hsla(209, 66%, 59%, 0.1);
}

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

.main-nav .logo {
  font-family: var(--font-heading);
  font-size: var(--font-size-h4);
  font-weight: var(--font-heading-weight);
  color: var(--color-accent);
  text-decoration: none;
  padding: var(--spacing-xs);
}

.main-nav-links {
  display: flex;
  gap: var(--spacing-2xl);
  list-style: none;
}

.main-nav-links a {
  color: var(--color-text);
  font-weight: var(--font-body-weight);
  font-size: var(--font-size-body-base);
  padding: var(--spacing-sm) 0;
  position: relative;
}

.main-nav-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0%;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--motion-micro-duration) var(--motion-timing-function);
}

.main-nav-links a:hover::after,
.main-nav-links a.active::after {
  width: 100%;
}

.nav-toggle {
  display: none; /* Hidden by default, visible on mobile */
  background: none;
  border: none;
  font-size: var(--spacing-2xl);
  color: var(--color-text);
  cursor: pointer;
}

/* Footer */
.footer {
  background-color: var(--color-background); /* Ensure consistent background */
  padding: var(--section-padding);
  color: var(--color-secondary);
  font-size: var(--font-size-body-small);
  border-top: 1px solid hsla(209, 66%, 59%, 0.1);
}

.footer .container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-3xl);
}

.footer-column h4 {
  color: var(--color-text);
  margin-bottom: var(--spacing-lg);
  font-size: var(--font-size-h6);
}

.footer-column ul {
  list-style: none;
  padding: 0;
}

.footer-column ul li {
  margin-bottom: var(--spacing-sm);
}

.footer-column ul li a {
  color: var(--color-secondary);
  font-size: var(--font-size-body-small);
}

.footer-column ul li a:hover {
  color: var(--color-text);
}

.social-links {
  display: flex;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.social-links a {
  color: var(--color-secondary);
  font-size: var(--spacing-2xl); /* Adjust icon size */
}

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

.footer-bottom {
  text-align: center;
  margin-top: var(--spacing-4xl);
  padding-top: var(--spacing-3xl);
  border-top: 1px solid hsla(209, 66%, 59%, 0.05);
}

/* Utility for screen readers */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Animations */
@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Example usage for animations (apply with JS or an animation library) */
.animate-fade-in-up {
  animation: fade-in-up var(--motion-section-duration) var(--motion-timing-function) forwards;
  opacity: 0; /* Ensure it starts hidden */
}

.animate-fade-in {
  animation: fade-in var(--motion-section-duration) var(--motion-timing-function) forwards;
  opacity: 0;
}

/* Responsive Breakpoints */

/* Tablets and Desktops (Max-width 1024px) */
@media (max-width: 1024px) {
  .container {
    padding: 0 var(--spacing-2xl);
  }

  h1 { font-size: clamp(2.5rem, 5.5vw + 1rem, 4rem); }
  h2 { font-size: clamp(2rem, 4vw + 1rem, 3rem); }
  h3 { font-size: clamp(1.75rem, 3vw + 1rem, 2.5rem); }

  .grid {
    grid-template-columns: repeat(2, minmax(0, 1fr)); /* Two columns for tablets */
    gap: var(--spacing-2xl);
  }

  .section {
    padding: clamp(3rem, 8vw, 6rem) 0;
  }

  .main-nav-links {
    gap: var(--spacing-xl);
  }
}

/* Smaller Tablets and Large Phones (Max-width 768px) */
@media (max-width: 768px) {
  .main-nav .logo {
    font-size: var(--font-size-h5);
  }

  .main-nav-links {
    display: none; /* Hide desktop nav links */
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--color-background);
    border-top: 1px solid hsla(209, 66%, 59%, 0.1);
    padding: var(--spacing-xl) 0;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    align-items: center;
  }

  .main-nav-links.active {
    display: flex; /* Show active mobile menu */
  }

  .main-nav-links a {
    padding: var(--spacing-lg) var(--spacing-xl);
    width: 100%;
    text-align: center;
    border-bottom: 1px solid hsla(209, 66%, 59%, 0.05);
  }
  .main-nav-links a:last-child {
      border-bottom: none;
  }
  .main-nav-links a::after {
      bottom: auto;
      top: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0%;
      height: 1px;
      background-color: var(--color-accent);
  }
  .main-nav-links a:hover::after,
  .main-nav-links a.active::after {
      width: 50%;
  }


  .nav-toggle {
    display: block; /* Show hamburger icon */
  }

  .main-nav .button-primary {
    display: none; /* Hide CTA button from nav on smaller screens if it's too cramped */
  }

  .grid {
    grid-template-columns: repeat(1, minmax(0, 1fr)); /* Single column for phones */
  }

  .flex {
    flex-direction: column;
    gap: var(--spacing-xl);
  }

  .footer .container {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  }
}

/* Small Phones (Max-width 375px) */
@media (max-width: 375px) {
  .container {
    padding: 0 var(--spacing-lg);
  }

  h1 { font-size: clamp(2rem, 6vw + 1rem, 3.5rem); }
  h2 { font-size: clamp(1.75rem, 5vw + 1rem, 2.75rem); }

  .button {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-body-base);
  }

  .section {
    padding: clamp(2rem, 6vw, 4rem) 0;
  }
}