:root {
  /* Common */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Light Theme */
  --background: #f5f5f7;
  --foreground: #1d1d1f;
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.3);
  --card-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
  --accent: #0071e3;
  --error: #ff3b30;
  --bg-gradient: radial-gradient(circle at 0% 0%, #fff 0%, #f5f5f7 100%);
}

[data-theme='dark'] {
  /* Dark Theme */
  --background: #000000;
  --foreground: #f5f5f7;
  --glass-bg: rgba(28, 28, 30, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);
  --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.4);
  --accent: #0a84ff;
  --error: #ff453a;
  --bg-gradient: radial-gradient(circle at 100% 100%, #1c1c1e 0%, #000 100%);
}

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

body {
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--foreground);
  font-family: var(--font-family);
  min-height: 100vh;
  transition: var(--transition-smooth);
  overflow-x: hidden;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: rgba(125, 125, 125, 0.3);
  border-radius: 10px;
  border: 3px solid transparent;
  background-clip: padding-box;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(125, 125, 125, 0.5);
}

.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--card-shadow);
  border-radius: 20px;
}

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

h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.022em;
  margin-bottom: 2rem;
  text-align: center;
}

button, .button {
  cursor: pointer;
  border: none;
  outline: none;
  font-family: inherit;
  transition: var(--transition-smooth);
}

input {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 0.8rem 1rem;
  color: var(--foreground);
  font-family: inherit;
  width: 100%;
}

input:focus {
  outline: 2px solid var(--accent);
}