:root {
    --bg-color: #f4f7f6;
    --card-bg: #ffffff;
    --text-color: #333333;
    --primary-color: #4a90e2;
    --primary-hover: #357abd;
    --border-color: #e0e0e0;
    --focus-color: rgba(74, 144, 226, 0.2);
    --success-color: #28a745;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

.container {
    width: 100%;
    max-width: 600px;
}

.card {
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

h1 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 24px;
    text-align: center;
    color: var(--primary-color);
}

h2 {
    font-size: 18px;
    font-weight: 500;
    margin-bottom: 12px;
}

.input-group {
    margin-bottom: 16px;
}

.input-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 14px;
    font-weight: 500;
}

.input-group input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-family: 'Poppins', sans-serif;
    font-size: 14px;
    transition: all 0.3s ease;
    outline: none;
}

.input-group input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--focus-color);
}

.result-section {
    margin-top: 32px;
    border-top: 1px solid var(--border-color);
    padding-top: 24px;
}

.textarea-wrapper {
    position: relative;
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

textarea {
    flex-grow: 1;
    min-height: 120px;
    padding: 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-family: 'Poppins', sans-serif;
    font-size: 14px;
    resize: vertical;
    background-color: #fafafa;
    color: #555;
    outline: none;
    line-height: 1.5;
}

#copy-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 12px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.1s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 48px;
    width: 48px;
    flex-shrink: 0;
}

#copy-btn:hover {
    background-color: var(--primary-hover);
}

#copy-btn:active {
    transform: scale(0.95);
}

#copy-msg {
    margin-top: 8px;
    font-size: 12px;
    color: var(--success-color);
    font-weight: 500;
    opacity: 1;
    transition: opacity 0.3s ease;
    text-align: right;
    height: 18px; /* Maintain height when hidden */
}

#copy-msg.hidden {
    opacity: 0;
}

@media (max-width: 480px) {
    .card {
        padding: 24px;
    }
}