:root {
  --primary-hue: 220;
  --primary: hsl(var(--primary-hue), 80%, 50%);
  --primary-light: hsl(var(--primary-hue), 80%, 65%);
  --primary-dark: hsl(var(--primary-hue), 80%, 35%);
  
  --secondary-hue: 280;
  --secondary: hsl(var(--secondary-hue), 80%, 50%);
  
  --bg-color: #0f172a;
  --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
  --surface: rgba(30, 41, 59, 0.7);
  --surface-border: rgba(255, 255, 255, 0.1);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  
  --font-family: 'Inter', system-ui, sans-serif;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --border-radius: 1rem;
}

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

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

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

h1, h2, h3, h4, h5, h6 {
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
}

/* Glassmorphism */
.glass {
  background: var(--surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--surface-border);
  border-radius: var(--border-radius);
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  border-radius: 9999px;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  font-family: inherit;
  font-size: 1rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.6);
}

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

.btn-outline:hover {
  background: var(--primary-light);
  color: #0f172a;
}

.btn-block {
  width: 100%;
}

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

.grid {
  display: grid;
  gap: 2rem;
}

.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }

@media (max-width: 768px) {
  .grid-cols-2, .grid-cols-3 {
    grid-template-columns: 1fr;
  }
}

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text-muted);
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--surface-border);
  border-radius: 0.75rem;
  color: var(--text-main);
  font-family: inherit;
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

/* Auth Pages */
.auth-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 2rem;
}

.auth-card {
  width: 100%;
  max-width: 450px;
  padding: 2.5rem;
}

.auth-title {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 0.5rem;
  background: linear-gradient(to right, #60a5fa, #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.auth-subtitle {
  text-align: center;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.auth-footer {
  margin-top: 2rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.auth-footer a {
  color: var(--primary-light);
  font-weight: 600;
}

.auth-footer a:hover {
  text-decoration: underline;
}

/* Error Box */
.alert {
  padding: 1rem;
  border-radius: 0.75rem;
  margin-bottom: 1.5rem;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.alert-error {
  background: rgba(220, 38, 38, 0.1);
  border: 1px solid rgba(220, 38, 38, 0.3);
  color: #fca5a5;
}

/* Nav */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  padding: 1rem 0;
  z-index: 100;
  transition: var(--transition);
}
.navbar.scrolled {
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--surface-border);
}

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

.nav-brand {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.nav-brand span {
  background: linear-gradient(to right, #60a5fa, #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}
.nav-link {
  font-weight: 500;
  transition: color 0.2s;
}
.nav-link:hover {
  color: var(--primary-light);
}

/* Hero Section */
.hero {
  padding: 10rem 0 6rem;
  text-align: center;
  position: relative;
}
.hero::before {
  content: '';
  position: absolute;
  top: -20%; left: 50%;
  transform: translateX(-50%);
  width: 80vw; height: 80vw;
  background: radial-gradient(circle, rgba(59,130,246,0.15) 0%, rgba(15,23,42,0) 70%);
  z-index: -1;
  border-radius: 50%;
}
.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  margin-bottom: 1.5rem;
  line-height: 1.1;
}
.hero p {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 2.5rem;
}
.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
}
@media (max-width: 600px) {
  .hero-cta { flex-direction: column; }
}

/* Features */
.section {
  padding: 6rem 0;
}
.section-header {
  text-align: center;
  margin-bottom: 4rem;
}
.section-title {
  font-size: 2.5rem;
}
.section-subtitle {
  color: var(--text-muted);
  font-size: 1.125rem;
}

.feature-card {
  padding: 2rem;
  text-align: center;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.feature-card:hover {
  transform: translateY(-10px);
}
.feature-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 1.5rem;
  background: rgba(59, 130, 246, 0.1);
  border-radius: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--primary-light);
}
.feature-title {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}
.feature-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Pricing */
.pricing-card {
  padding: 3rem 2rem;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}
.pricing-card.popular {
  border-color: var(--primary-light);
  box-shadow: 0 0 30px rgba(59, 130, 246, 0.2);
}
.pricing-badge {
  position: absolute;
  top: 1rem; right: 1rem;
  background: var(--primary);
  font-size: 0.75rem;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-weight: bold;
}
.pricing-title {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}
.pricing-price {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1rem;
}
.pricing-price span {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 500;
}
.pricing-features {
  list-style: none;
  margin: 2rem 0;
  flex-grow: 1;
}
.pricing-features li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  color: var(--text-muted);
}
.pricing-features li i {
  color: var(--primary-light);
}

/* Footer */
.footer {
  background: rgba(0,0,0,0.3);
  padding: 4rem 0 2rem;
  border-top: 1px solid var(--surface-border);
}
.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  margin-top: 2rem;
  border-top: 1px solid var(--surface-border);
  color: var(--text-muted);
  font-size: 0.875rem;
}