:root {
    --bg-color: #f0f0f0;
    --container-bg: #ffffff;
    --text-color: #333333;
    --btn-bg: #4CAF50;
    --btn-hover: #45a049;
    --number-bg: #eeeeee;
    --shadow: rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --container-bg: #2d2d2d;
    --text-color: #f0f0f0;
    --btn-bg: #388e3c;
    --btn-hover: #2e7d32;
    --number-bg: #404040;
    --shadow: rgba(0, 0, 0, 0.5);
}

body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

.main-nav {
    position: fixed;
    top: 1rem;
    right: 1rem;
    display: flex;
    gap: 1rem;
    z-index: 1000;
}

.nav-link {
    text-decoration: none;
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 5px;
    background-color: var(--container-bg);
    box-shadow: 0 2px 4px var(--shadow);
    transition: all 0.3s;
    font-weight: bold;
}

.nav-link:hover {
    background-color: var(--btn-bg);
    color: white;
}

.nav-link.active {
    background-color: var(--btn-bg);
    color: white;
}

.container {
    text-align: center;
    background-color: var(--container-bg);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 8px var(--shadow);
    transition: background-color 0.3s, box-shadow 0.3s;
    margin-top: 4rem;
    max-width: 600px;
    width: 90%;
}

/* Animal Test Styles */
.upload-container {
    margin: 2rem 0;
    padding: 2rem;
    border: 2px dashed var(--number-bg);
    border-radius: 10px;
    cursor: pointer;
    transition: border-color 0.3s;
}

.upload-container:hover {
    border-color: var(--btn-bg);
}

#image-preview {
    max-width: 100%;
    max-height: 300px;
    margin-top: 1rem;
    display: none;
    border-radius: 8px;
}

#label-container {
    margin-top: 2rem;
    font-size: 1.2rem;
    font-weight: bold;
}

.result-bar {
    background-color: var(--number-bg);
    height: 20px;
    border-radius: 10px;
    margin-top: 0.5rem;
    overflow: hidden;
}

.result-fill {
    height: 100%;
    background-color: var(--btn-bg);
    width: 0%;
    transition: width 0.5s ease-out;
}

.theme-switch-wrapper {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 1rem;
}

#theme-toggle {
    background: none;
    border: 1px solid var(--text-color);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s;
}

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

h1 {
    color: var(--text-color);
    margin-bottom: 1.5rem;
}

#generate-btn {
    background-color: var(--btn-bg);
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 5px;
    font-size: 1.2rem;
    cursor: pointer;
    transition: background-color 0.3s;
}

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

#lotto-numbers {
    display: flex;
    justify-content: center;
    margin-top: 2rem;
}

.number {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--number-bg);
    margin: 0 0.5rem;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}