/* ========================================
   CSS Variables & Reset
   ======================================== */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a25;
  --accent-gold: #d4a853;
  --accent-red: #e63946;
  --accent-orange: #f77f00;
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --border-subtle: #2a2a3a;
  --shadow-glow: 0 0 30px rgba(212, 168, 83, 0.3);
  --transition-fast: 0.3s ease;
  --transition-slow: 0.6s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans SC', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

img {
  max-width: 100%;
}

/* ========================================
   Typography
   ======================================== */
h1, h2, h3 {
  font-weight: 700;
  line-height: 1.2;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  background: linear-gradient(135deg, var(--accent-gold) 0%, var(--accent-orange) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  color: var(--text-primary);
}

h3 {
  font-size: 1.25rem;
  color: var(--accent-gold);
}

/* ========================================
   Navbar
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background var(--transition-fast), backdrop-filter var(--transition-fast);
}

.navbar.scrolled {
  background: rgba(10, 10, 15, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-subtle);
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.5rem;
  font-weight: 700;
}

.navbar-logo svg {
  width: 40px;
  height: 40px;
}

.navbar-logo span {
  background: linear-gradient(135deg, var(--accent-gold) 0%, var(--accent-orange) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.navbar-links {
  display: flex;
  gap: 2rem;
}

.navbar-links a {
  position: relative;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  font-weight: 500;
}

.navbar-links a:hover,
.navbar-links a.active {
  color: var(--accent-gold);
}

.navbar-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-gold), var(--accent-orange));
  transition: width var(--transition-fast);
}

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

.navbar-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
}

.navbar-menu-btn span {
  width: 25px;
  height: 2px;
  background: var(--accent-gold);
  transition: var(--transition-fast);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 6rem 2rem 4rem;
  position: relative;
  overflow: hidden;
}

/* Background Effects */
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(212, 168, 83, 0.15) 0%, transparent 60%);
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 80%, rgba(230, 57, 70, 0.1) 0%, transparent 40%),
              radial-gradient(circle at 80% 80%, rgba(247, 127, 0, 0.1) 0%, transparent 40%);
}

/* Particles */
.particles {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: var(--accent-gold);
  border-radius: 50%;
  opacity: 0.6;
  animation: float 15s infinite ease-in-out;
}

.particle:nth-child(2) { left: 20%; animation-delay: -2s; animation-duration: 18s; }
.particle:nth-child(3) { left: 40%; animation-delay: -4s; animation-duration: 12s; }
.particle:nth-child(4) { left: 60%; animation-delay: -6s; animation-duration: 20s; }
.particle:nth-child(5) { left: 80%; animation-delay: -8s; animation-duration: 14s; }
.particle:nth-child(6) { left: 10%; animation-delay: -3s; animation-duration: 16s; }
.particle:nth-child(7) { left: 70%; animation-delay: -5s; animation-duration: 22s; }
.particle:nth-child(8) { left: 30%; animation-delay: -7s; animation-duration: 17s; }

@keyframes float {
  0%, 100% {
    transform: translateY(100vh) scale(0);
    opacity: 0;
  }
  10% {
    opacity: 0.6;
    transform: translateY(80vh) scale(1);
  }
  90% {
    opacity: 0.6;
    transform: translateY(-10vh) scale(1);
  }
  100% {
    transform: translateY(-20vh) scale(0);
    opacity: 0;
  }
}

.hero-content {
  max-width: 800px;
  z-index: 1;
}

.hero-tagline {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.hero-title {
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
}

/* Download Buttons */
.hero-downloads {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-gold) 0%, var(--accent-orange) 100%);
  color: var(--bg-primary);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
  border-color: var(--accent-gold);
  box-shadow: var(--shadow-glow);
}

.btn svg {
  width: 20px;
  height: 20px;
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 2rem;
  max-width: 400px;
  width: 90%;
  text-align: center;
  transform: scale(0.9);
  transition: transform var(--transition-fast);
}

.modal-overlay.active .modal {
  transform: scale(1);
}

.modal h3 {
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
}

.modal-code {
  background: var(--bg-primary);
  padding: 1rem 1.5rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  font-family: 'Orbitron', monospace;
  font-size: 1.5rem;
  color: var(--accent-gold);
  letter-spacing: 4px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-code span {
  user-select: all;
}

.copy-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.5rem;
  transition: color var(--transition-fast);
}

.copy-btn:hover {
  color: var(--accent-gold);
}

.copy-btn svg {
  width: 24px;
  height: 24px;
}

.modal-link {
  display: inline-block;
  margin-top: 1rem;
  color: var(--accent-gold);
  text-decoration: underline;
}

.system-req {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.system-req svg {
  width: 16px;
  height: 16px;
  vertical-align: middle;
  margin-right: 0.25rem;
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

.scroll-indicator svg {
  width: 30px;
  height: 30px;
  color: var(--accent-gold);
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-10px); }
  60% { transform: translateX(-50%) translateY(-5px); }
}

/* ========================================
   Features Section
   ======================================== */
.features {
  padding: 6rem 2rem;
  background: var(--bg-secondary);
}

.features-container {
  max-width: 1200px;
  margin: 0 auto;
}

.features h2 {
  text-align: center;
  margin-bottom: 3rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 2.5rem;
  text-align: center;
  transition: all var(--transition-fast);
  opacity: 0;
  transform: translateY(30px);
}

.feature-card.animate-in {
  opacity: 1;
  transform: translateY(0);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-gold);
  box-shadow: var(--shadow-glow);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1.5rem;
  color: var(--accent-gold);
  transition: transform var(--transition-fast);
}

.feature-card:hover .feature-icon {
  transform: scale(1.1);
}

.feature-icon svg {
  width: 100%;
  height: 100%;
}

.feature-card h3 {
  margin-bottom: 1rem;
}

.feature-card p {
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border-subtle);
  padding: 3rem 2rem;
  text-align: center;
}

.footer-content {
  max-width: 800px;
  margin: 0 auto;
}

.footer-company {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.footer-address {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.footer-phone {
  font-size: 0.875rem;
  color: var(--accent-gold);
}

.footer-copyright {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.footer-copyright span {
  color: var(--accent-gold);
}

/* ========================================
   Animations
   ======================================== */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-up.animate-in {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   Mobile Menu
   ======================================== */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  right: -100%;
  width: 70%;
  max-width: 300px;
  height: 100vh;
  background: var(--bg-secondary);
  padding: 5rem 2rem 2rem;
  transition: right var(--transition-fast);
  z-index: 999;
  border-left: 1px solid var(--border-subtle);
}

.mobile-menu.active {
  right: 0;
}

.mobile-menu a {
  display: block;
  padding: 1rem 0;
  color: var(--text-secondary);
  font-size: 1.125rem;
  border-bottom: 1px solid var(--border-subtle);
  transition: color var(--transition-fast);
}

.mobile-menu a:hover {
  color: var(--accent-gold);
}

.mobile-menu-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 998;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.mobile-menu-overlay.active {
  opacity: 1;
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 992px) {
  .navbar-links {
    display: none;
  }

  .navbar-menu-btn {
    display: flex;
  }

  .mobile-menu {
    display: block;
  }
}

@media (max-width: 768px) {
  .hero {
    padding: 5rem 1.5rem 3rem;
  }

  .hero-downloads {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }

  .features {
    padding: 4rem 1.5rem;
  }

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

@media (max-width: 480px) {
  .navbar {
    padding: 1rem 1.5rem;
  }

  .navbar-logo span {
    font-size: 1.25rem;
  }

  h1 {
    font-size: 2rem;
  }

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

  .feature-card {
    padding: 1.5rem;
  }
}