:root {
    --primary-color: #6366f1; /* Indigo 500 */
    --primary-hover: #4f46e5; /* Indigo 600 */
    --secondary-color: #f3f4f6; /* Gray 100 */
    --text-primary: #111827; /* Gray 900 */
    --text-secondary: #4b5563; /* Gray 600 */
    --bg-body: #f9fafb; /* Gray 50 */
    --surface-card: #ffffff;
    --border-radius: 0.75rem;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    background-color: var(--bg-body);
    color: var(--text-secondary);
    font-family: 'Poppins', system-ui, -apple-system, sans-serif;
    -webkit-font-smoothing: antialiased;
}

/* Navbar */
.navbar {
    background-color: rgba(255, 255, 255, 0.8) !important;
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(229, 231, 235, 0.5);
    padding: 1rem 0;
}

.navbar-brand {
    color: var(--text-primary) !important;
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.025em;
}

.nav-link {
    color: var(--text-secondary) !important;
    font-weight: 500;
    transition: color 0.2s;
}

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

/* Buttons */
.btn {
    border-radius: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Cards */
.card {
    background-color: var(--surface-card);
    border: 1px solid rgba(229, 231, 235, 0.5);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(99, 102, 241, 0.2);
}

.card-body {
    padding: 1.5rem;
}

.card-title {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 0.75rem;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    font-weight: 700;
    letter-spacing: -0.025em;
}

.display-4 {
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Utility */
.shadow-soft {
    box-shadow: var(--shadow-lg);
}

.rounded-xl {
    border-radius: 1rem;
}

.bg-surface {
    background-color: var(--surface-card);
}

/* Footer */
footer.footer {
    background-color: var(--surface-card);
    border-top: 1px solid rgba(229, 231, 235, 0.5);
    color: var(--text-secondary);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
    animation: fadeIn 0.6s ease-out forwards;
}