:root {
    --bg-color: #f0f2f5;
    --bg-gradient: linear-gradient(to top, #a8edea 0%, #fed6e3 100%);
    --container-bg: #ffffff;
    --text-color: #333;
    --primary-color: #4a90e2;
    --primary-hover: #357abd;
    --number-text: #fff;
    --shadow: rgba(0, 0, 0, 0.1);
}

body.dark-mode {
    --bg-color: #1a1a1a;
    --bg-gradient: linear-gradient(135deg, #2c3e50 0%, #000000 100%);
    --container-bg: #2d2d2d;
    --text-color: #f0f0f0;
    --primary-color: #357abd;
    --primary-hover: #4a90e2;
    --number-text: #fff;
    --shadow: rgba(0, 0, 0, 0.5);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: var(--bg-color);
    background-image: var(--bg-gradient);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    position: relative;
    text-align: center;
    background-color: var(--container-bg);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 30px var(--shadow);
    transition: transform 0.3s ease, background-color 0.3s ease, box-shadow 0.3s ease;
}

.container:hover {
    transform: translateY(-5px);
}

h1 {
    margin-bottom: 30px;
    color: var(--text-color);
    font-size: 2rem;
}

.lottery-numbers {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
}

.number {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 60px;
    height: 60px;
    background-color: var(--primary-color);
    color: var(--number-text);
    font-size: 1.8rem;
    font-weight: bold;
    border-radius: 50%;
    box-shadow: 0 4px 10px var(--shadow);
    transition: all 0.3s ease;
}

.number:hover {
    transform: scale(1.1);
    background-color: var(--primary-hover);
}

.generate-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 1.2rem;
    font-weight: bold;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(74, 144, 226, 0.4);
}

.generate-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(74, 144, 226, 0.5);
}

.theme-toggle {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-color);
    opacity: 0.7;
    transition: opacity 0.3s ease;
}

.theme-toggle:hover {
    opacity: 1;
}