:root {
    --bg-color: #f0f0f0;
    --container-bg: white;
    --text-color: #333;
    --number-bg: #eee;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --btn-color: #4CAF50;
    --btn-hover: #45a049;
}

[data-theme="dark"] {
    --bg-color: #1a1a2e;
    --container-bg: #16213e;
    --text-color: #eaeaea;
    --number-bg: #0f3460;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --btn-color: #4CAF50;
    --btn-hover: #45a049;
}

body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--bg-color);
    transition: background-color 0.3s ease;
    margin: 0;
}

.container {
    text-align: center;
    padding: 2rem;
    background-color: var(--container-bg);
    border-radius: 10px;
    box-shadow: 0 0 20px var(--shadow-color);
    position: relative;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.theme-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 50%;
    background-color: var(--number-bg);
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.theme-toggle:hover {
    transform: scale(1.1);
}

.icon-sun,
.icon-moon {
    position: absolute;
    transition: opacity 0.3s ease;
}

.icon-sun {
    opacity: 1;
    color: #f39c12;
}

.icon-moon {
    opacity: 0;
    color: #f1c40f;
}

[data-theme="dark"] .icon-sun {
    opacity: 0;
}

[data-theme="dark"] .icon-moon {
    opacity: 1;
}

h1 {
    color: var(--text-color);
    margin-bottom: 2rem;
    transition: color 0.3s ease;
}

.lotto-display {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
}

.lotto-number {
    display: inline-block;
    width: 40px;
    height: 40px;
    line-height: 40px;
    border-radius: 50%;
    background-color: var(--number-bg);
    margin: 0 0.5rem;
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

#generator-btn {
    padding: 0.8rem 2rem;
    font-size: 1rem;
    color: white;
    background-color: var(--btn-color);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

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

/* Money Rain Animation */
.money-rain {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1000;
    overflow: hidden;
}

.money {
    position: absolute;
    top: -100px;
    font-size: 2rem;
    animation: fall linear forwards;
    opacity: 0;
}

.money.active {
    opacity: 1;
}

.money img {
    width: 50px;
    height: auto;
    filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.3));
}

@keyframes fall {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh) rotate(360deg);
        opacity: 0.7;
    }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.container.celebrate {
    animation: shake 0.5s ease-in-out;
}

/* Contact Form */
.contact-form {
    margin-top: 2rem;
    max-width: 400px;
}

.contact-form h2 {
    color: var(--text-color);
    margin-bottom: 0.5rem;
    transition: color 0.3s ease;
}

.form-subtitle {
    color: var(--text-color);
    opacity: 0.7;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 2px solid var(--number-bg);
    border-radius: 8px;
    background-color: var(--container-bg);
    color: var(--text-color);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s ease, background-color 0.3s ease;
    box-sizing: border-box;
}

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

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

.submit-btn {
    width: 100%;
    padding: 0.8rem 2rem;
    font-size: 1rem;
    color: white;
    background-color: var(--btn-color);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
}

.submit-btn:hover {
    background-color: var(--btn-hover);
    transform: translateY(-2px);
}