/* Global Styles */
:root {
    --primary-color: #4f46e5; /* Indigo 600 */
    --secondary-color: #3b82f6; /* Blue 500 */
    --card-shadow: 0 10px 25px -12px rgba(79, 70, 229, 0.25);
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    transition: background 0.2s ease, color 0.2s ease;
}

/* Header Styles */
header {
    height: 64px;
    transition: background 0.3s ease;
}

header h1 {
    font-weight: 900;
    letter-spacing: -0.02em;
    text-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

/* Card Styles */
.card {
    border-radius: 1.5rem;
    box-shadow: var(--card-shadow);
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 14px 34px rgba(79, 70, 229, 0.2);
}

/* Button Styles */
.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border-radius: 9999px;
    font-weight: 600;
    padding: 0.75em 1.5em;
    transition: all 0.25s ease;
}

.btn-primary:hover {
    background-color: #3730a3; /* Indigo 700 */
    transform: translate(0, -2px);
    box-shadow: 0 8px 16px rgba(79,70,229,0.2);
}

/* Form Styles */
form input,
form textarea {
    border-radius: 0.75rem;
    border: 2px solid #e5e7eb;
    padding: 0.75rem 1rem;
    transition: all 0.25s ease;
}

form input:focus,
form textarea:focus {
    border-color: var(--primary-color);
    outline-offset: 2px;
    outline: 2px solid var(--primary-color);
}

/* Animation */
@keyframes fade-in {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

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

/* Link Hover */
.link:hover {
    color: #c3b8ff; /* Indigo 300 */
}

/* Footer */
footer {
    border-top: 1px solid rgba(255,255,255,0.1);
    transition: background 0.3s ease;
}

/* Media Queries */
@media (max-width: 640px) {
    .card {
        margin: 1rem;
    }
}