:root {
    --bg-color: #f4f7f6;
    --text-color: #2c3e50;
    --card-bg-color: #ffffff;
    --button-bg: #3498db;
    --button-hover: #2980b9;
    --ball-empty-bg: #eee;
    --ball-empty-text: #888;
    --transition-speed: 0.3s;
}

body.dark-mode {
    --bg-color: #1a1a1a;
    --text-color: #f4f7f6;
    --card-bg-color: #2d2d2d;
    --button-bg: #4a90e2;
    --button-hover: #357abd;
    --ball-empty-bg: #444;
    --ball-empty-text: #ccc;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 2rem 0;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

#app {
    background-color: var(--card-bg-color);
    padding: 3rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    text-align: center;
    width: 90%;
    max-width: 500px;
    position: relative;
    transition: background-color var(--transition-speed);
}

.divider {
    height: 1px;
    background-color: var(--ball-empty-bg);
    margin: 2rem 0;
}

#affiliate-section {
    text-align: left;
}

#affiliate-section h2 {
    text-align: center;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.form-group {
    margin-bottom: 1.2rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--ball-empty-bg);
    border-radius: 8px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: inherit;
    box-sizing: border-box;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--button-bg);
}

.form-group textarea {
    height: 100px;
    resize: vertical;
}

#submit-btn {
    width: 100%;
    background-color: var(--button-bg);
    color: white;
    border: none;
    padding: 0.8rem;
    font-size: 1rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    transition: background-color var(--transition-speed);
}

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

#comments-section h2 {
    text-align: center;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.theme-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
}

#theme-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 5px;
    border-radius: 50%;
    transition: transform 0.2s;
}

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

h1 {
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.subtitle {
    margin-bottom: 2rem;
    opacity: 0.8;
}

/* Upload Area */
#upload-area {
    margin-bottom: 2rem;
}

#drop-zone {
    border: 2px dashed var(--ball-empty-bg);
    border-radius: 15px;
    padding: 3rem;
    cursor: pointer;
    transition: all 0.3s;
}

#drop-zone:hover {
    border-color: var(--button-bg);
    background-color: rgba(52, 152, 219, 0.05);
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

/* Result Container */
#result-container {
    margin-top: 1rem;
}

#face-image {
    width: 100%;
    max-width: 300px;
    border-radius: 15px;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

#label-container {
    margin-bottom: 2rem;
}

.result-bar-wrapper {
    margin-bottom: 1rem;
    text-align: left;
}

.result-label {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    font-weight: bold;
}

.bar-bg {
    background-color: var(--ball-empty-bg);
    height: 15px;
    border-radius: 10px;
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    background-color: var(--button-bg);
    transition: width 1s ease-out;
}

/* Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--ball-empty-bg);
    border-top: 4px solid var(--button-bg);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 2rem auto 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

#retry-btn {
    background-color: var(--button-bg);
    color: white;
    border: none;
    padding: 0.8rem 2rem;
    font-size: 1.1rem;
    border-radius: 30px;
    cursor: pointer;
    transition: background-color var(--transition-speed);
}

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