body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: transparent;
    color: #cdd6f4;
    margin: 0;
    padding: 20px;
    overflow: hidden;
}

#container {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: rgba(17, 18, 27, 0.8);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 2rem;
    max-width: 450px;
    margin: 0 auto;
}

h2 {
    margin-top: 0;
    font-size: 1.5rem;
    background: linear-gradient(135deg, #89b4fa, #cba6f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
}

#puzzle-date-div, #difficulty-div {
    margin: 10px 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

label {
    font-size: 0.9rem;
    color: #bac2de;
}

#puzzle-date, #difficulty-select {
    background: #1e1e2e;
    border: 1px solid #313244;
    color: #cdd6f4;
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 0.9rem;
    outline: none;
}

button {
    background: #313244;
    border: 1px solid #45475a;
    color: #cdd6f4;
    padding: 8px 15px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

button:hover:not(:disabled) {
    background: #45475a;
    border-color: #89b4fa;
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

#solve-button {
    margin: 20px 0;
    width: 100%;
    height: 45px;
    background: linear-gradient(135deg, #89b4fa, #cba6f7);
    color: #11111b;
    border: none;
    font-weight: 700;
    font-size: 1rem;
    border-radius: 12px;
}

#solve-button:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

#puzzle-canvas {
    background: #11111b;
    border-radius: 12px;
    margin-top: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    border: 1px solid #313244;
}

#timer-span {
    font-size: 0.8rem;
    color: #89b4fa;
    margin-top: 10px;
}

#footer {
    display: none; /* Hide as it's redundant inside the site */
}