:root {
    --bg-color: #f0f2f5;
    --text-color: #333;
    --container-bg: white;
    --primary-button-bg: #4A90E2;
    --primary-button-text-color: white;
    --box-shadow-color: rgba(0, 0, 0, 0.1);
    --primary-button-shadow-color: rgba(74, 144, 226, 0.4);
    --input-border-color: #ccc;
    --input-bg: white;
    --input-text-color: #333;
    --hover-button-bg: #357ABD;
}

body.dark-theme {
    --bg-color: #282c36;
    --text-color: #e0e0e0;
    --container-bg: #3a404d;
    --primary-button-bg: #61afef;
    --primary-button-text-color: #282c36;
    --box-shadow-color: rgba(0, 0, 0, 0.3);
    --primary-button-shadow-color: rgba(97, 175, 239, 0.4);
    --input-border-color: #555;
    --input-bg: #4a5264;
    --input-text-color: #e0e0e0;
    --hover-button-bg: #4a8cdb;
}

body {
    font-family: 'Noto Sans KR', sans-serif; /* 한국어 폰트 추가 */
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--bg-color);
    background-image: url("data:image/svg+xml,%3Csvg width='6' height='6' viewBox='0 0 6 6' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%239C92AC' fill-opacity='0.1'%3E%3Cpath d='M5 0h1L0 6V5zM6 5v1H5z'/%3E%3C/g%3E%3C/svg%3E");
    margin: 0;
    transition: background-color 0.3s ease, color 0.3s ease;
    color: var(--text-color);
    line-height: 1.6;
}

body.dark-theme {
    background-image: url("data:image/svg+xml,%3Csvg width='6' height='6' viewBox='0 0 6 6' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%235A6270' fill-opacity='0.1'%3E%3Cpath d='M5 0h1L0 6V5zM6 5v1H5z'/%3E%3C/g%3E%3C/svg%3E");
}

.container {
    text-align: center;
    background-color: var(--container-bg);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px var(--box-shadow-color);
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
    width: 90%;
    max-width: 500px;
    position: relative; /* For theme-toggle positioning */
}

h1 {
    color: var(--text-color);
    font-size: 2em; /* Adjusted for mobile */
    margin-bottom: 20px;
    transition: color 0.3s ease;
}

#theme-toggle {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    font-size: 1.5em; /* Adjusted size */
    cursor: pointer;
    transition: transform 0.2s ease, color 0.3s ease;
    padding: 5px;
    border-radius: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-color);
}

#theme-toggle:hover {
    transform: scale(1.1);
}

.saju-input-form {
    margin-top: 20px;
}

.input-group {
    display: flex;
    flex-direction: column;
    align-items: flex-start; /* Labels aligned left */
    margin-bottom: 15px;
    gap: 5px;
}

.input-group label {
    font-size: 1em;
    color: var(--text-color);
    margin-bottom: 5px;
}

.input-group input[type="number"],
.input-group select {
    width: calc(100% - 20px); /* Adjust width for padding */
    padding: 10px;
    margin-top: 5px;
    border: 1px solid var(--input-border-color);
    border-radius: 8px;
    background-color: var(--input-bg);
    color: var(--input-text-color);
    font-size: 1em;
    transition: border-color 0.3s ease, background-color 0.3s ease, color 0.3s ease;
}

.input-group input[type="number"]:focus,
.input-group select:focus {
    border-color: var(--primary-button-bg);
    outline: none;
}

.input-group input[type="number"]::placeholder {
    color: #888;
}

body.dark-theme .input-group input[type="number"]::placeholder {
    color: #bbb;
}

.button-group {
    display: flex;
    gap: 15px;
    margin-top: 30px;
    justify-content: center;
    flex-wrap: wrap; /* For mobile responsiveness */
}

.button-group button {
    background-color: var(--primary-button-bg);
    color: var(--primary-button-text-color);
    border: none;
    padding: 12px 25px;
    font-size: 1.1em;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px var(--primary-button-shadow-color);
    flex-grow: 1; /* Allow buttons to grow */
    max-width: 200px; /* Limit max width */
}

.button-group button:hover {
    background-color: var(--hover-button-bg);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--primary-button-shadow-color);
}

.saju-result {
    margin-top: 30px;
    padding: 20px;
    background-color: var(--input-bg);
    border-radius: 10px;
    box-shadow: 0 2px 10px var(--box-shadow-color);
    color: var(--input-text-color);
    min-height: 100px; /* Placeholder for result */
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1em;
    text-align: left;
    white-space: pre-wrap; /* For displaying formatted text */
    transition: background-color 0.3s ease, box-shadow 0.3s ease, color 0.3s ease;
}

/* Responsive adjustments */
@media (max-width: 600px) {
    .container {
        padding: 20px;
        width: 95%;
    }
    h1 {
        font-size: 1.8em;
    }
    .button-group button {
        width: 100%; /* Full width buttons on small screens */
        max-width: none;
    }
    .input-group input[type="number"],
    .input-group select {
        width: calc(100% - 20px);
    }
    #theme-toggle {
        font-size: 1.3em;
        top: 10px;
        right: 10px;
    }
}