:root {
    --bg-color: #f0f2f5;
    --container-bg: #ffffff;
    --text-color: #333333;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --accent-color: #673ab7;
}

body.dark-mode {
    --bg-color: #18191a;
    --container-bg: #242526;
    --text-color: #e4e6eb;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --accent-color: #9575cd;
body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    display: flex;
    justify-content: center;
    align-items: flex-start; /* top align for scrolling */
    min-height: 100vh;
    background-color: var(--bg-color);
    margin: 0;
    padding: 40px 0; /* add padding top/bottom */
    transition: background-color 0.3s ease;
}

.container {
    position: relative;
    text-align: center;
    background-color: var(--container-bg);
    padding: 50px 40px;
    border-radius: 20px;
    box-shadow: 0 10px 25px var(--shadow-color);
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
    max-width: 400px;
    width: 90%;
}

.theme-btn {
...
.submit-btn:hover {
    background-color: var(--accent-color);
    color: white;
}

.comments-section {
    margin-top: 50px;
    padding-top: 30px;
    border-top: 1px solid var(--shadow-color);
    text-align: left;
}

    padding: 5px 12px;
    font-size: 12px;
    cursor: pointer;
    background: transparent;
    border: 1px solid var(--text-color);
    color: var(--text-color);
    border-radius: 20px;
    opacity: 0.7;
    transition: opacity 0.3s;
}

.theme-btn:hover {
    opacity: 1;
}

h1 {
    margin-bottom: 30px;
    color: var(--text-color);
    font-size: 2rem;
}

#fortune-container {
    min-height: 120px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 30px;
    padding: 20px;
    border: 2px dashed var(--accent-color);
    border-radius: 15px;
    background-color: rgba(103, 58, 183, 0.05);
}

#fortune-text {
    font-size: 1.2rem;
    line-height: 1.6;
    color: var(--text-color);
    word-break: keep-all;
}

#generate-btn {
    padding: 15px 30px;
    font-size: 1.1rem;
    font-weight: bold;
    color: white;
    background-color: var(--accent-color);
    border: none;
    border-radius: 30px;
    cursor: pointer;
    transition: transform 0.2s, background-color 0.3s;
    box-shadow: 0 4px 15px rgba(103, 58, 183, 0.3);
}

#generate-btn:hover {
    background-color: #5e35b1;
    transform: translateY(-2px);
}

#generate-btn:active {
    transform: translateY(0);
}

.contact-section {
    margin-top: 50px;
    padding-top: 30px;
    border-top: 1px solid var(--shadow-color);
}

.contact-section h2 {
    font-size: 1.2rem;
    color: var(--text-color);
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 15px;
}

#contact-form input,
#contact-form textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--shadow-color);
    border-radius: 8px;
    background-color: var(--container-bg);
    color: var(--text-color);
    font-family: inherit;
    box-sizing: border-box;
}

#contact-form textarea {
    height: 80px;
    resize: none;
}

.submit-btn {
    width: 100%;
    padding: 10px;
    background-color: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s;
}

.submit-btn:hover {
    background-color: var(--accent-color);
    color: white;
}