:root {
  --bg-color: #0f172a;
  --text-color: #f8fafc;
  --accent-color: #38bdf8;
  --accent-gradient: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

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

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

h1 {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  background: var(--accent-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

h2 {
  font-size: 2.5rem;
  margin-bottom: 2rem;
  text-align: center;
}

p {
  color: #94a3b8;
  font-size: 1.125rem;
  margin-bottom: 1.5rem;
}

a {
  text-decoration: none;
  color: inherit;
  transition: opacity 0.2s;
}

a:hover {
  opacity: 0.8;
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

section {
  padding: 5rem 0;
}

/* Header */
header {
  padding: 2rem 0;
  position: absolute;
  width: 100%;
  top: 0;
  z-index: 10;
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-color);
}

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.custom-select {
  position: relative;
  width: 120px;
  font-family: var(--font-main);
  user-select: none;
}

.selected-option {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  backdrop-filter: blur(10px);
  transition: background 0.2s;
}

.selected-option:hover {
  background: rgba(255, 255, 255, 0.1);
}

.options-container {
  position: absolute;
  top: 100%;
  right: 0;
  width: 160px;
  background: #1e293b;
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  margin-top: 0.5rem;
  overflow: hidden;
  display: none;
  z-index: 100;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.options-container.active {
  display: block;
  animation: fadeIn 0.2s ease;
}

.option {
  padding: 0.75rem 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transition: background 0.2s;
}

.option:hover {
  background: rgba(255, 255, 255, 0.05);
}

.flag {
  font-size: 1.2rem;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }

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

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  background: radial-gradient(circle at top right, rgba(56, 189, 248, 0.1), transparent 40%),
    radial-gradient(circle at bottom left, rgba(129, 140, 248, 0.1), transparent 40%);
}

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

.hero-logo {
  width: 120px;
  height: 120px;
  margin-bottom: 2rem;
  border-radius: 24px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 50px;
  font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary {
  background: var(--accent-gradient);
  color: white;
  box-shadow: 0 4px 15px rgba(56, 189, 248, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.4);
}

.btn-secondary {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.feature-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  padding: 2rem;
  border-radius: 20px;
  backdrop-filter: blur(10px);
  transition: transform 0.3s;
}

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

.feature-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
  display: inline-block;
  padding: 1rem;
  background: rgba(56, 189, 248, 0.1);
  border-radius: 15px;
  color: var(--accent-color);
}

/* Support Section */
.support {
  text-align: center;
  background: linear-gradient(to bottom, transparent, rgba(56, 189, 248, 0.05));
}

.coffee-btn {
  background: #FFDD00;
  color: #000;
  font-weight: 700;
  padding: 1rem 2rem;
  border-radius: 50px;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.2rem;
  box-shadow: 0 4px 15px rgba(255, 221, 0, 0.3);
  transition: transform 0.2s;
}

.coffee-btn:hover {
  transform: scale(1.05);
}

/* Footer */
footer {
  padding: 4rem 0;
  border-top: 1px solid var(--glass-border);
  text-align: center;
  color: #64748b;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1rem;
}

/* Responsive */
@media (max-width: 768px) {
  h1 {
    font-size: 2.5rem;
  }

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

  .nav-links {
    display: none;
  }
}