:root {
  --bg-color: #f8fafc;
  --text-color: #0f172a;
  --accent-color: #38bdf8;
  --button-text-color: white;
  --logo-bg: #ffffff;
  --shadow-color: rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
  --bg-color: #0f172a;
  --text-color: #f8fafc;
  --accent-color: #38bdf8;
  --button-text-color: white;
  --logo-bg: #1e293b;
  --shadow-color: rgba(0, 0, 0, 0.3);
}

body {
    margin: 0;
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    text-align: center;
    transition: background 0.3s, color 0.3s;
}
h1 {
    margin-top: 50px;
}
button {
    margin-top: 20px;
    padding: 12px 24px;
    font-size: 16px;
    background: var(--accent-color);
    color: var(--button-text-color);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    transition: transform 0.1s;
}
button:active {
    transform: scale(0.95);
}
#theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    margin-top: 0;
    background: transparent;
    color: var(--text-color);
    border: 1px solid var(--text-color);
    padding: 8px 16px;
}
#result {
    margin-top: 40px;
    line-height: 1.2;
}

#partnership {
    margin-top: 80px;
    padding: 40px 20px;
    border-top: 1px solid var(--shadow-color);
}

#partnership h2 {
    margin-bottom: 30px;
}

#partnership form {
    max-width: 400px;
    margin: 0 auto;
    text-align: left;
}

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

input[type="email"],
textarea {
    width: 100%;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--accent-color);
    background: var(--bg-color);
    color: var(--text-color);
    box-sizing: border-box;
    font-size: 14px;
}

textarea {
    height: 120px;
    resize: none;
}

#partnership button {
    width: 100%;
}

#comments {
    max-width: 800px;
    margin: 80px auto 40px;
    padding: 0 20px;
    border-top: 1px solid var(--shadow-color);
}

#disqus_thread {
    margin-top: 40px;
}

img {
    margin-top: 30px;
    width: 140px;
    height: 140px;
    object-fit: contain;
    background: var(--logo-bg);
    border-radius: 24px;
    padding: 20px;
    box-shadow: 0 10px 25px var(--shadow-color);
    display: none;
    transition: background 0.3s, box-shadow 0.3s;
}