:root {
  /* Common variables */
  --font-family: 'Inter', sans-serif;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --border-radius: 16px;
  
  /* Light Theme */
  --bg-color: #f8fafc;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --card-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(0, 0, 0, 0.05);
  --accent-color: #6366f1;
  --accent-hover: #4f46e5;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --nav-bg: rgba(255, 255, 255, 0.8);
  --input-bg: rgba(255, 255, 255, 0.9);
  --input-border: #e2e8f0;
}

[data-theme='dark'] {
  /* Dark Theme */
  --bg-color: #0b0f19;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --card-bg: rgba(30, 41, 59, 0.5);
  --glass-border: rgba(255, 255, 255, 0.1);
  --accent-color: #818cf8;
  --accent-hover: #6366f1;
  --accent-gradient: linear-gradient(135deg, #818cf8 0%, #c084fc 100%);
  --nav-bg: rgba(11, 15, 25, 0.8);
  --input-bg: rgba(15, 23, 42, 0.7);
  --input-border: rgba(255, 255, 255, 0.2);
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color 0.4s ease, color 0.4s ease;
}

body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.1) 0%, transparent 40%),
              radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.08) 0%, transparent 30%);
  z-index: -1;
  animation: bg-spin 25s linear infinite;
}

@keyframes bg-spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

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

/* Glassmorphism */
.glass {
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.05);
}

.bg-gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Base App Layout */
.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-weight: 600;
  border-radius: 9999px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
  font-size: 1rem;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
}

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

.btn-secondary:hover {
  background: var(--input-border);
}

/* Utility / App wide inputs */
.input-wrapper {
  margin-bottom: 20px;
  width: 100%;
}

.input-field {
  width: 100%;
  padding: 16px 24px;
  border-radius: 12px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  transition: var(--transition);
  outline: none;
}

.input-field:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

/* Animations */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  animation: revealUp 0.8s forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }

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

.skeleton-loading {
  background: linear-gradient(90deg, var(--card-bg) 25%, var(--input-border) 50%, var(--card-bg) 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
}

@keyframes loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Section Spacing */
.section {
  padding: 100px 0;
}