:root {
    --primary-color: #5372F0;
    --primary-dark: #3e5de1;
    --background-color: #f9fafb;
    --container-bg: #ffffff;
    --text-color: #333;
    --muted-color: #adadad;
}

body {
    margin: 0;
    font-family: 'Poppins', sans-serif;
    background: var(--background-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 20px;
}

header h1 {
    font-size: 2rem;
    color: var(--primary-color);
}

header p {
    font-size: 1rem;
    color: var(--text-color);
}

.container {
    background: var(--container-bg);
    border-radius: 8px;
    max-width: 800px;
    width: 100%;
    padding: 20px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.wrapper {
    border: 1px solid #ddd;
    border-radius: 5px;
    overflow: hidden;
}

.text-input {
    display: flex;
    flex-direction: row;
    border-bottom: 1px solid #ddd;
    gap: 10px;
}

.text-input textarea {
    width: 50%;
    height: 200px;
    padding: 10px 20px; /* Increased for breathing room */
    border: none;
    resize: none;
    font-size: 16px;
}

.text-input .to-text {
    border-left: 1px solid #ddd;
}

.controls {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    padding: 10px;
    align-items: center;
}

.controls .row {
    display: flex;
    align-items: center;
    width: 48%;
    margin: 5px 0;
}

.controls .row select {
    flex: 1;
    max-width: 70%; /* Reduced width to leave space for icons */
    padding: 8px;
    font-size: 16px;
    border: 1px solid #ddd;
    border-radius: 5px;
    background: #f1f1f1;
}

.controls .row .icons {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: 8px;
}

.controls .row .icons i {
    font-size: 18px;
    cursor: pointer;
    color: var(--muted-color);
    transition: color 0.2s, transform 0.1s;
}

.controls .row .icons i:hover {
    color: var(--primary-color);
    transform: scale(1.1);
}

.exchange {
    font-size: 24px;
    color: var(--muted-color);
    cursor: pointer;
    transition: color 0.2s, transform 0.3s;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    margin: 10px 0;
}

.exchange:hover {
    color: var(--primary-color);
    transform: rotate(180deg);
}

.container button {
    width: 100%;
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 5px;
    padding: 14px;
    font-size: 16px;
    cursor: pointer;
    margin-top: 15px;
    transition: background 0.2s, transform 0.1s;
}

.container button:hover {
    background: var(--primary-dark);
}

footer {
    text-align: center;
    margin-top: 20px;
    font-size: 0.9rem;
    color: var(--muted-color);
}

@media (max-width: 768px) {
    .text-input {
        flex-direction: column;
    }

    .text-input textarea {
        width: 100%;
        border: none;
        border-top: 1px solid #ddd;
        padding: 12px 16px; /* balanced for mobile readability */
    }

    .controls {
        flex-direction: column;
    }

    .controls .row {
        width: 100%;
    }

    .controls .row select {
        max-width: 100%; /* full width on mobile */
    }

    .exchange {
        font-size: 28px;
    }
}