:root {
  --primary: #7c3aed; /* Violet */
  --primary-hover: #6d28d9;
  --secondary: #ef4444; /* Red */
  --secondary-hover: #dc2626;
  --bg-dark: #0f172a;
  --bg-card: rgba(30, 41, 59, 0.7);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-bg: rgba(255, 255, 255, 0.05);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-dark);
}
::-webkit-scrollbar-thumb {
  background: var(--primary);
  border-radius: 4px;
}

/* Navbar */
nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--glass-border);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-main);
  text-decoration: none;
}

.logo span {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
}

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

/* Hero Section */
.hero {
  position: relative;
  min-height: 80vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 4rem 2rem;
  overflow: hidden;
}

#particles-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

.hero h1 {
  font-size: 4rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, #fff 0%, #cbd5e1 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  max-width: 900px;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 600px;
  margin-bottom: 2.5rem;
}

.cta-button {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  padding: 1rem 2.5rem;
  border-radius: 99px;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  box-shadow: 0 10px 25px -5px rgba(124, 58, 237, 0.4);
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 30px -5px rgba(124, 58, 237, 0.5);
}

/* Tool Section */
.tool-container {
  max-width: 1000px;
  margin: 2rem auto 4rem;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 2rem;
  padding: 3rem;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.upload-zone {
  border: 2px dashed var(--glass-border);
  border-radius: 1.5rem;
  padding: 4rem 2rem;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
  background: var(--glass-bg);
}

.upload-zone:hover, .upload-zone.dragover {
  border-color: var(--primary);
  background: rgba(124, 58, 237, 0.05);
}

.upload-icon {
  font-size: 3rem;
  color: var(--primary);
  margin-bottom: 1rem;
}

/* Compression Controls */
.controls {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.control-group label {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 600;
}

select {
  background: var(--bg-dark);
  border: 1px solid var(--glass-border);
  color: white;
  padding: 0.75rem;
  border-radius: 0.5rem;
  outline: none;
}

/* Result Dashboard */
.result-dashboard {
  display: none;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--glass-border);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--glass-bg);
  padding: 1.5rem;
  border-radius: 1rem;
  text-align: center;
}

.stat-value {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Features */
.features {
  padding: 8rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  text-align: center;
  margin-bottom: 4rem;
}

.section-title h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: var(--glass-bg);
  padding: 2.5rem;
  border-radius: 1.5rem;
  border: 1px solid var(--glass-border);
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-10px);
  background: rgba(255, 255, 255, 0.08);
}

.feature-icon {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  color: white;
}

/* Content Sections */
.content-section {
  max-width: 800px;
  margin: 4rem auto;
  color: var(--text-muted);
}

.content-section h2, .content-section h3 {
  color: var(--text-main);
  margin: 2rem 0 1rem;
}

/* Footer */
footer {
  background: #070b14;
  padding: 5rem 2rem 2rem;
  border-top: 1px solid var(--glass-border);
}

.footer-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 4rem;
}

.footer-col h4 {
  margin-bottom: 1.5rem;
  color: white;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.75rem;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
}

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

.footer-bottom {
  max-width: 1200px;
  margin: 4rem auto 0;
  padding-top: 2rem;
  border-top: 1px solid var(--glass-border);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

@media (max-width: 768px) {
  .hero h1 { font-size: 2.5rem; }
  .tool-container { padding: 1.5rem; margin-top: -2rem; }
  .stats-grid { grid-template-columns: 1fr; }
  .nav-links { display: none; }
}