:root {
    --background-color: #121212;
    --surface-color: #1e1e1e;
    --primary-color: #33aaff;
    --on-surface-color: #ffffff;
    --on-surface-color-secondary: #b3b3b3;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--on-surface-color);
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    box-sizing: border-box;
}

.container {
    width: 100%;
    max-width: 800px;
    background-color: var(--surface-color);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

h1 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 30px;
}

.converter {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 30px;
}

.form-group {
    flex: 1;
    display: flex;
    flex-direction: column;
}

label {
    margin-bottom: 8px;
    color: var(--on-surface-color-secondary);
    font-size: 0.9em;
}

input[type="number"],
input[type="text"] {
    background-color: var(--background-color);
    color: var(--on-surface-color);
    border: 1px solid var(--primary-color);
    border-radius: 4px;
    padding: 12px;
    font-size: 1em;
    outline: none;
    transition: border-color 0.3s;
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
input[type="number"] {
  -moz-appearance: textfield;
}


input[type="number"]:focus,
input[type="text"]:focus {
    border-color: var(--on-surface-color);
}

.arrow {
    font-size: 2em;
    color: var(--primary-color);
}

.timezone-selector {
    display: flex;
    flex-direction: column;
}

select {
    background-color: var(--background-color);
    color: var(--on-surface-color);
    border: 1px solid var(--primary-color);
    border-radius: 4px;
    padding: 12px;
    font-size: 1em;
    outline: none;
    cursor: pointer;
}

/* Responsive Design */
@media (max-width: 600px) {
    .container {
        padding: 20px;
    }

    .converter {
        flex-direction: column;
    }

    .form-group {
        width: 100%;
    }

    .arrow {
        transform: rotate(90deg);
        margin: 10px 0;
    }
}