:root {
    --bg-color: #0f1115;
    --text-color: #e2e8f0;
    --card-bg: #1e222a;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body.dark-mode {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-stack);
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

#app-container {
    max-width: 800px;
    width: 90%;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.05em;
    margin-bottom: 0.5rem;
    background: linear-gradient(90deg, #e2e8f0, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

p {
    color: #94a3b8;
    line-height: 1.6;
}

.card {
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

button {
    background-color: var(--accent);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.2s ease;
    margin-top: 1rem;
}

button:hover {
    background-color: var(--accent-hover);
}

/* Micro-animations */
.fade-in {
    animation: fadeIn 1s ease-out forwards;
}

.slide-up {
    animation: slideUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    opacity: 0;
    transform: translateY(20px);
}

.pulse-on-hover:hover {
    animation: pulse 1s infinite;
}

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

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

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

footer {
    text-align: center;
    margin-top: 4rem;
    font-size: 0.875rem;
    color: #64748b;
}