:root {
    --bg-color: #f0f2f5;
    --container-bg: #ffffff;
    --text-color: #333;
    --subtitle-color: #666;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --btn-bg: #4f46e5;
    --btn-hover: #4338ca;
    --input-bg: #ffffff;
    --input-border: #d1d5db;
    --card-bg: #f9fafb;
}

body.dark-mode {
    --bg-color: #111827;
    --container-bg: #1f2937;
    --text-color: #f3f4f6;
    --subtitle-color: #9ca3af;
    --shadow-color: rgba(0, 0, 0, 0.4);
    --btn-bg: #6366f1;
    --btn-hover: #4f46e5;
    --input-bg: #374151;
    --input-border: #4b5563;
    --card-bg: #374151;
}

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    background-color: var(--container-bg);
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 10px 25px var(--shadow-color);
    text-align: center;
    width: 100%;
    max-width: 500px;
    transition: background-color 0.3s ease;
}

.theme-toggle {
    text-align: right;
    margin-bottom: 10px;
}

#theme-btn {
    background: none;
    border: 1px solid var(--text-color);
    color: var(--text-color);
    padding: 6px 12px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
}

h1 {
    margin: 10px 0;
    font-size: 28px;
}

.subtitle {
    color: var(--subtitle-color);
    margin-bottom: 30px;
    font-size: 15px;
}

.input-section {
    text-align: left;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.input-group label {
    font-size: 14px;
    font-weight: 600;
}

input[type="date"],
input[type="time"],
input[type="password"],
input[type="text"] {
    padding: 10px;
    border-radius: 8px;
    border: 1px solid var(--input-border);
    background-color: var(--input-bg);
    color: var(--text-color);
    font-size: 16px;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 5px;
    margin-top: 5px;
}

.checkbox-group label {
    font-weight: normal;
    font-size: 13px;
}

.radio-group {
    display: flex;
    gap: 15px;
}

.radio-group input {
    margin-right: 5px;
}

#analyze-btn {
    background-color: var(--btn-bg);
    color: white;
    border: none;
    padding: 15px;
    font-size: 17px;
    font-weight: 600;
    border-radius: 10px;
    cursor: pointer;
    margin-top: 10px;
    transition: background-color 0.2s, transform 0.1s;
}

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

#analyze-btn:active {
    transform: scale(0.98);
}

#loading {
    margin-top: 30px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(0, 0, 0, 0.1);
    border-left-color: var(--btn-bg);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 15px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

#result-container {
    margin-top: 30px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.result-card {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    text-align: left;
    border-left: 4px solid var(--btn-bg);
}

.result-card h3 {
    margin-top: 0;
    font-size: 18px;
    color: var(--btn-bg);
}

.result-card .content {
    line-height: 1.6;
    white-space: pre-wrap;
}

.music-info .song-title {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 10px;
}

.hidden {
    display: none !important;
}