@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
  /* Colors */
  --primary: #4F46E5;
  --primary-hover: #4338CA;
  --secondary: #10B981;
  --accent: #F43F5E;
  
  /* Light Theme Variables */
  --bg-color: #F9FAFB;
  --text-main: #111827;
  --text-muted: #6B7280;
  --card-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.5);
  --glass-shadow: 0 4px 30px rgba(0, 0, 0, 0.05);

  /* Font & Typography */
  --font-sans: 'Inter', sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  /* Dark Theme Variables */
  --bg-color: #0F172A;
  --text-main: #F8FAFC;
  --text-muted: #94A3B8;
  --card-bg: rgba(30, 41, 59, 0.6);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
  --primary: #6366F1;
  --primary-hover: #818CF8;
}

/* Base Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
}

ul {
  list-style: none;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

button {
  font-family: var(--font-sans);
  cursor: pointer;
  border: none;
  outline: none;
}

/* Reusable Container */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Typography styles */
.text-gradient {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  color: transparent;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); font-weight: 800; line-height: 1.2; }
h2 { font-size: clamp(2rem, 4vw, 3rem); font-weight: 700; line-height: 1.2; }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 600; }
p { font-size: 1.125rem; }

/* Utilities */
.text-center { text-align: center; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mt-4 { margin-top: 2rem; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: var(--transition);
  gap: 8px;
}

.btn-primary {
  background-color: var(--primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.4);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.6);
}

.btn-outline {
  background-color: transparent;
  color: var(--text-main);
  border: 1px solid var(--text-muted);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* Glasscard */
.glass-card {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow);
  transition: var(--transition);
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 16px 0;
  z-index: 1000;
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--glass-border);
  transition: var(--transition);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo i {
  color: var(--primary);
  font-size: 1.8rem;
}

.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav-links a {
  font-weight: 500;
  color: var(--text-muted);
}

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

.nav-actions {
  display: flex;
  gap: 16px;
  align-items: center;
}

.theme-toggle {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  transition: var(--transition);
  border: 1px solid var(--glass-border);
}

.theme-toggle:hover {
  background: var(--card-bg);
}

/* Background blob decorations for aesthetic */
.blob {
  position: absolute;
  filter: blur(80px);
  z-index: -1;
  opacity: 0.5;
  border-radius: 50%;
  animation: float 10s infinite ease-in-out alternate;
}

.blob-1 {
  width: 400px;
  height: 400px;
  background: var(--primary);
  top: -100px;
  left: -100px;
}

.blob-2 {
  width: 300px;
  height: 300px;
  background: var(--secondary);
  top: 20%;
  right: -50px;
  animation-delay: -5s;
}

@keyframes float {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(30px, 50px) scale(1.1); }
}

/* Responsive basics */
@media (max-width: 768px) {
  .nav-links {
    display: none; /* simple mobile hide for now */
  }
}