:root {
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --accent-color: #3b82f6;
  --success-color: #10b981;
  --border-color: #334155;
  --radius-lg: 16px;
  --radius-md: 8px;
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

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

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

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

.header h1 {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(to right, #60a5fa, #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.5rem;
}

.header p {
  color: var(--text-secondary);
}

/* Nav */
.nav-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background: rgba(30, 41, 59, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: white;
}

.nav-links a {
  margin-left: 1.5rem;
  color: var(--text-secondary);
  transition: color 0.2s;
}

.nav-links a:hover, .nav-links a.active {
  color: white;
}

/* Components */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  background-color: var(--accent-color);
  color: white;
  border: none;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.2s;
}

.btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.1);
}

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

.card {
  background-color: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
}

.input-group {
  margin-bottom: 1rem;
}

.input-label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.file-input-wrapper {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3rem;
  text-align: center;
  transition: border-color 0.2s;
  cursor: pointer;
}

.file-input-wrapper:hover {
  border-color: var(--accent-color);
  background-color: rgba(59, 130, 246, 0.05);
}

input[type="range"] {
  width: 100%;
  height: 6px;
  background: var(--border-color);
  border-radius: 3px;
  appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-color);
  cursor: pointer;
}