/* ============================================
   Immerse Networks Limited - Styles
   ============================================ */

/* CSS Custom Properties (Light Mode - Default) */
:root {
  /* Colors - Light Mode */
  --color-primary: #F5A623;
  --color-primary-hover: #E09000;
  --color-bg: #FFFFFF;
  --color-surface: #F7F8FA;
  --color-text: #1A1A2E;
  --color-text-secondary: #5A6A7E;
  --color-footer-bg: #1A1A2E;
  --color-footer-text: #F1F5F9;
  --color-nav-bg: #FFFFFF;
  --color-nav-shadow: rgba(0, 0, 0, 0.08);
  --color-card-bg: #F7F8FA;
  --color-card-border: #E2E8F0;
  --color-hero-overlay: rgba(26, 26, 46, 0.65);

  /* Typography */
  --font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.6;

  /* Spacing */
  --section-padding: 80px 0;
  --container-max-width: 1200px;
  --nav-height: 72px;

  /* Transitions */
  --transition-speed: 0.3s;
  --transition-ease: ease;
}

/* Dark Mode */
[data-theme="dark"] {
  --color-bg: #0F172A;
  --color-surface: #162032;
  --color-text: #F1F5F9;
  --color-text-secondary: #94A3B8;
  --color-footer-bg: #0B1120;
  --color-footer-text: #F1F5F9;
  --color-nav-bg: #1E293B;
  --color-nav-shadow: rgba(0, 0, 0, 0.3);
  --color-card-bg: #1E293B;
  --color-card-border: #334155;
  --color-hero-overlay: rgba(15, 23, 42, 0.75);
}

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

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

body {
  font-family: var(--font-family);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-speed) var(--transition-ease),
              color var(--transition-speed) var(--transition-ease);
  overflow-x: hidden;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-speed) var(--transition-ease);
}

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

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

ul {
  list-style: none;
}

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

/* ============================================
   Navbar
   ============================================ */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--color-nav-bg);
  box-shadow: 0 1px 3px var(--color-nav-shadow);
  transition: background-color var(--transition-speed) var(--transition-ease),
              box-shadow var(--transition-speed) var(--transition-ease);
}

nav {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo img {
  height: auto;
  width: 175px;
  transition: filter var(--transition-speed) var(--transition-ease);
}

/* Brighten logo in dark mode for visibility on dark navbar */
[data-theme="dark"] .nav-logo img {
  filter: brightness(1.3) contrast(1.1);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 8px 4px;
  position: relative;
  transition: color var(--transition-speed) var(--transition-ease);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-speed) var(--transition-ease);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* Theme Toggle */
.theme-toggle {
  background: none;
  border: 2px solid var(--color-card-border);
  border-radius: 8px;
  cursor: pointer;
  padding: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
  transition: all var(--transition-speed) var(--transition-ease);
}

.theme-toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* Sun/Moon icon visibility */
.icon-sun {
  display: none;
}

.icon-moon {
  display: block;
}

[data-theme="dark"] .icon-sun {
  display: block;
}

[data-theme="dark"] .icon-moon {
  display: none;
}

/* Hamburger Menu */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}

.hamburger-line {
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  transition: all var(--transition-speed) var(--transition-ease);
}

.hamburger.active .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

.hamburger.active .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background-image: url('../img/bkgrnd/datacenter_1920w.jpeg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  margin-top: var(--nav-height);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-hero-overlay);
  z-index: 1;
  transition: background var(--transition-speed) var(--transition-ease);
}

#particle-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 3;
  max-width: 800px;
  padding: 40px 24px;
  color: #FFFFFF;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.25rem;
  line-height: 1.7;
  margin-bottom: 32px;
  color: rgba(255, 255, 255, 0.9);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition-speed) var(--transition-ease);
  border: none;
  text-align: center;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #1A1A2E;
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  color: #1A1A2E;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(245, 166, 35, 0.4);
}

.btn-cta {
  background-color: #FFFFFF;
  color: #1A1A2E;
  font-weight: 700;
}

.btn-cta:hover {
  background-color: #F1F5F9;
  color: #1A1A2E;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* ============================================
   Services Sections
   ============================================ */
.services-section {
  padding: var(--section-padding);
  background-color: var(--color-bg);
  transition: background-color var(--transition-speed) var(--transition-ease);
}

.services-alt {
  background-color: var(--color-surface);
}

.services-section h2 {
  text-align: center;
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 48px;
  color: var(--color-text);
}

.services-grid {
  display: grid;
  gap: 32px;
}

.services-grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.services-grid-2 {
  grid-template-columns: repeat(2, 1fr);
  max-width: 900px;
  margin: 0 auto;
}

.service-card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: 12px;
  padding: 32px;
  text-align: center;
  transition: all var(--transition-speed) var(--transition-ease);
}

.service-card:hover,
.service-card:focus {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
  border-color: var(--color-primary);
}

/* Enhanced hover shadow for dark mode visibility */
[data-theme="dark"] .service-card:hover,
[data-theme="dark"] .service-card:focus {
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
}

.service-card:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.service-icon {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 20px;
  color: var(--color-primary);
}

.service-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-text);
}

.service-card p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ============================================
   About Section
   ============================================ */
.about-section {
  padding: var(--section-padding);
  background-color: var(--color-bg);
  transition: background-color var(--transition-speed) var(--transition-ease);
}

.about-section h2 {
  text-align: center;
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 36px;
  color: var(--color-text);
}

.about-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.about-content p {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  line-height: 1.8;
}

.about-content p:last-child {
  margin-bottom: 0;
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
  padding: var(--section-padding);
  background-color: var(--color-primary);
  text-align: center;
  transition: background-color var(--transition-speed) var(--transition-ease);
}

.cta-section h2 {
  font-size: 2.25rem;
  font-weight: 700;
  color: #1A1A2E;
  margin-bottom: 16px;
}

.cta-section p {
  font-size: 1.15rem;
  color: rgba(26, 26, 46, 0.85);
  margin-bottom: 32px;
}

/* ============================================
   Footer
   ============================================ */
footer {
  background-color: var(--color-footer-bg);
  color: var(--color-footer-text);
  padding: 60px 0 24px;
  transition: background-color var(--transition-speed) var(--transition-ease),
              color var(--transition-speed) var(--transition-ease);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: #FFFFFF;
}

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col ul li a {
  color: #94A3B8;
  font-size: 0.9rem;
  transition: color var(--transition-speed) var(--transition-ease);
  overflow-wrap: break-word;
  word-break: break-word;
}

.footer-col ul li a:hover {
  color: var(--color-primary);
}

.social-links {
  display: flex;
  gap: 16px;
}

.social-links a {
  color: #94A3B8;
  transition: color var(--transition-speed) var(--transition-ease);
}

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

.footer-bottom {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
  font-size: 0.875rem;
  color: #94A3B8;
}

/* ============================================
   Focus Styles (Accessibility)
   ============================================ */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ============================================
   Responsive Design
   ============================================ */

/* Tablet */
@media (max-width: 1023px) {
  .services-grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero h1 {
    font-size: 2.75rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  .footer-grid {
    gap: 24px;
  }

  .footer-col ul li a {
    word-break: break-word;
    overflow-wrap: break-word;
  }

  .cta-section h2 {
    font-size: 2rem;
  }
}

/* Mobile */
@media (max-width: 767px) {
  :root {
    --nav-height: 64px;
  }

  .hamburger {
    display: flex;
    min-width: 44px;
    min-height: 44px;
  }

  .theme-toggle {
    min-width: 44px;
    min-height: 44px;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 75%;
    max-width: 320px;
    height: 100vh;
    background-color: var(--color-nav-bg);
    flex-direction: column;
    justify-content: center;
    gap: 24px;
    padding: 24px;
    transition: right var(--transition-speed) var(--transition-ease);
    box-shadow: -4px 0 12px rgba(0, 0, 0, 0.1);
    z-index: 1000;
  }

  .nav-links.open {
    right: 0;
  }

  .nav-link {
    font-size: 1.15rem;
    padding: 12px 0;
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  .services-grid-3,
  .services-grid-2 {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .services-section h2,
  .about-section h2,
  .cta-section h2 {
    font-size: 1.75rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-col ul li a {
    display: inline-block;
    min-height: 44px;
    line-height: 44px;
  }

  .btn {
    padding: 14px 28px;
    font-size: 1rem;
    min-height: 44px;
  }

  .social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
  }
}

/* Small Mobile */
@media (max-width: 374px) {
  .hero h1 {
    font-size: 1.75rem;
  }

  .container {
    padding: 0 16px;
  }
}

/* Mobile Menu Overlay */
.nav-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
}

.nav-overlay.active {
  display: block;
}