:root {
  --primary: #6366f1;
  --primary-light: #818cf8;
  --primary-dark: #4f46e5;
  --secondary: #10b981;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --light: #e5e7eb;
  --dark: #0f172a;
  --bg-dark: #0a0e1a;
  --bg-card: #1e293b;
  --bg-elevated: #252f3f;
  --text-light: #f8fafc;
  --text-muted: #94a3b8;
  --border: #334155;
  --shadow: #00000080;
}

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

html {
  scroll-behavior: smooth;
}

::selection {
  background: #6366f14d;
  color: var(--text-light);
}

body {
  font-family: Roboto, sans-serif;
  background: radial-gradient(
    ellipse at top,
    #1e293b 0%,
    #0f172a 50%,
    #0a0e1a 100%
  );
  color: var(--text-light);
  min-height: 100vh;
  line-height: 1.6;
  letter-spacing: -0.01em;
}

.navbar-custom {
  background: #1e293bcc;
  box-shadow: 0 4px 30px #00000099;
  border-bottom: 1px solid #6366f14d;
  padding: 1.2rem 2rem !important;
}

.navbar-brand {
  color: white !important;
  font-size: 1.6rem !important;
  font-weight: 700 !important;
  letter-spacing: -0.02em;
}

.btn-navbar {
  background: #6366f11a;
  color: var(--text-light);
  border: 1px solid #6366f166;
  font-weight: 600;
  transition: background 0.3s ease;
}

.btn-navbar:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
  box-shadow: 0 8px 20px #6366f166;
}

.btn {
  padding: 0.9rem 1.8rem;
  border: none;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease;
  font-size: 1rem;
  letter-spacing: -0.01em;
}

.btn:hover {
  box-shadow: 0 8px 24px #00000066;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-gradient {
  background: linear-gradient(
    135deg,
    var(--primary) 0%,
    var(--primary-dark) 100%
  );
  color: white;
  border: none;
}

.btn-gradient:hover {
  background: linear-gradient(
    135deg,
    var(--primary-light) 0%,
    var(--primary) 100%
  );
  box-shadow: 0 8px 24px #6366f166 !important;
  color: white;
}

.btn-signup {
  background: linear-gradient(135deg, #0ea5e9, #14b8a6) !important;
}

.btn-signup:hover {
  background: linear-gradient(135deg, #06b6d4, #0d9488) !important;
  color: white;
}

.btn-login {
  background: linear-gradient(135deg, #10b981, #059669) !important;
}

.btn-login:hover {
  background: linear-gradient(135deg, #059669, #047857) !important;
  color: white;
}

@media (max-width: 768px) {
  .navbar-custom {
    padding: 1rem 1.5rem !important;
  }
}