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

:root {
  --primary: #4F46E5; /* Indigo 600 */
  --primary-hover: #4338ca;
  --secondary: #ec4899; /* Pink 500 */
  --background: #f8fafc; /* Slate 50 */
  --surface: #ffffff;
  --text-main: #0f172a; /* Slate 900 */
  --text-muted: #64748b; /* Slate 500 */
  --border: #e2e8f0; /* Slate 200 */
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-glass: 0 8px 32px 0 rgba(31, 38, 135, 0.07);

  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: 1px solid rgba(255, 255, 255, 0.18);
  
  --font-family: 'Inter', sans-serif;
  --transition: all 0.3s ease;
}

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

html {
  font-family: var(--font-family);
  scroll-behavior: smooth;
  font-size: 16px;
  color: var(--text-main);
  background-color: var(--background);
}

body {
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--text-main);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
p { margin-bottom: 1rem; color: var(--text-muted); }

/* Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 5rem 0;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: var(--glass-border);
  transition: var(--transition);
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-menu {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-link {
  font-weight: 500;
  color: var(--text-main);
  transition: var(--transition);
  position: relative;
}

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

.hamburger {
  display: none;
  cursor: pointer;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-main);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  gap: 0.5rem;
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  opacity: 0.95;
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

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

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

/* Glassmorphism Cards */
.glass-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.glass-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-5px);
}

/* Hero Section */
.hero {
  padding-top: 150px;
  padding-bottom: 80px;
  text-align: center;
  background: radial-gradient(circle at top right, rgba(236, 72, 153, 0.1), transparent 40%),
              radial-gradient(circle at top left, rgba(79, 70, 229, 0.1), transparent 40%);
}

.hero h1 {
  font-size: 3.5rem;
  max-width: 800px;
  margin: 0 auto 1.5rem;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.25rem;
  max-width: 600px;
  margin: 0 auto 2rem;
}

.hero-btns {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

/* Features Section */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: rgba(79, 70, 229, 0.1);
  color: var(--primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

/* Form Elements */
.form-group {
  margin-bottom: 1.5rem;
  text-align: left;
}

.form-label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 1rem;
  background: #fdfdfd;
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* Tool Layout */
.tool-grid {
  display: grid;
  grid-template-columns: 350px 1fr;
  gap: 2rem;
}
.tool-sidebar {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  border: 1px solid var(--border);
  height: fit-content;
}
.tool-main {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 2rem;
  border: 1px solid var(--border);
  min-height: 500px;
  position: relative;
}

.output-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.output-actions {
  display: flex;
  gap: 0.5rem;
}

.output-content {
  color: var(--text-main);
}

.output-content h2, .output-content h3 {
  margin-top: 2rem;
}

.output-content ul {
  list-style: disc;
  margin-left: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-muted);
}

.output-stats {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}
.stat-badge {
  background: rgba(79, 70, 229, 0.1);
  color: var(--primary);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-weight: 500;
}

/* Footer */
footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 4rem 0 2rem;
  margin-top: 4rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
}
.footer-col h4 {
  margin-bottom: 1.5rem;
}
.footer-links li {
  margin-bottom: 0.75rem;
}
.footer-links a {
  color: var(--text-muted);
  transition: var(--transition);
}
.footer-links a:hover {
  color: var(--primary);
}
.footer-bottom {
  text-align: center;
  border-top: 1px solid var(--border);
  padding-top: 2rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Animations */
.fade-in {
  animation: fadeIn 0.8s ease forwards;
}

.slide-up {
  opacity: 0;
  transform: translateY(20px);
  animation: slideUp 0.8s ease forwards;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

/* Loading Spinner */
.loader {
  border: 4px solid var(--border);
  border-top: 4px solid var(--primary);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 2rem auto;
}
@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 992px) {
  .tool-grid {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  .hero h1 { font-size: 2.5rem; }
  
  .nav-menu {
    display: none;
    position: absolute;
    top: 80px;
    left: 0;
    width: 100%;
    background: var(--surface);
    flex-direction: column;
    padding: 2rem;
    box-shadow: var(--shadow-md);
  }
  .nav-menu.active {
    display: flex;
  }
  .hamburger {
    display: block;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
  }
}