:root {
    --bg-color: #2C3E50;
    --text-color: #ECF0F1;
    --container-bg: transparent;
    --button-bg: #3498DB;
    --button-hover: #2980B9;
    --dot-color: rgba(255, 255, 255, 0.05);
    --form-input-bg: rgba(255, 255, 255, 0.1);
}

body.light-mode {
    --bg-color: #F8F9FA;
    --text-color: #2C3E50;
    --dot-color: rgba(0, 0, 0, 0.05);
    --form-input-bg: rgba(0, 0, 0, 0.05);
}

body {
    font-family: 'Noto Sans KR', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-image: radial-gradient(circle, var(--dot-color) 1px, transparent 1px);
    background-size: 20px 20px;
    transition: background-color 0.3s, color 0.3s;
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
}

#theme-button {
    background: none;
    border: 2px solid var(--text-color);
    color: var(--text-color);
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 700;
    transition: all 0.3s;
}

#theme-button:hover {
    background-color: var(--text-color);
    color: var(--bg-color);
}

.container {
    text-align: center;
    max-width: 600px;
    width: 100%;
    padding: 20px;
}

header h1 {
    font-weight: 700;
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

header p {
    margin-bottom: 2rem;
    font-size: 1.1rem;
    opacity: 0.8;
}

.upload-area {
    background-color: var(--form-input-bg);
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 30px;
    border: 2px dashed var(--dot-color);
}

.upload-button {
    padding: 15px 40px;
    font-size: 1.2rem;
    font-weight: 700;
    color: white;
    background-color: var(--button-bg);
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.upload-button:hover {
    background-color: var(--button-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

#webcam-container {
    margin: 20px auto;
}

#webcam-container canvas {
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    max-width: 100%;
}

#label-container {
    margin-top: 30px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.prediction-label {
    background-color: var(--form-input-bg);
    padding: 12px 20px;
    border-radius: 10px;
    font-weight: 700;
    font-size: 1.1rem;
    text-align: center;
}

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

.contact-section h2 {
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-width: 400px;
    margin: 0 auto;
}

.contact-form input, 
.contact-form textarea {
    padding: 12px;
    border: 1px solid var(--dot-color);
    border-radius: 8px;
    background-color: var(--form-input-bg);
    color: var(--text-color);
    font-family: inherit;
}

.contact-form textarea {
    height: 100px;
    resize: none;
}

.contact-form button {
    padding: 12px;
    background-color: var(--button-bg);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 700;
    transition: background-color 0.3s;
}

.contact-form button:hover {
    background-color: var(--button-hover);
}

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

@media (max-width: 600px) {
    header h1 { font-size: 2rem; }
    .upload-area { padding: 20px; }
    .start-button { padding: 12px 30px; font-size: 1.1rem; }
}