:root {
    --bg-gradient: linear-gradient(to right, #6a11cb, #2575fc);
    --container-bg: #ffffff;
    --text-color: #333333;
    --title-color: #2575fc;
    --card-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    --btn-bg: #2575fc;
    --btn-hover: #6a11cb;
    --btn-shadow: rgba(37, 117, 252, 0.5);
    --btn-hover-shadow: rgba(106, 17, 203, 0.5);
    --separator-color: #aaaaaa;
    --bonus-label-color: #888888;
}

body.dark-mode {
    --bg-gradient: linear-gradient(to right, #1a1a2e, #16213e);
    --container-bg: #1e1e2e;
    --text-color: #e0e0e0;
    --title-color: #7aa2f7;
    --card-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
    --btn-bg: #7aa2f7;
    --btn-hover: #bb9af7;
    --btn-shadow: rgba(122, 162, 247, 0.4);
    --btn-hover-shadow: rgba(187, 154, 247, 0.4);
    --separator-color: #555555;
    --bonus-label-color: #aaaaaa;
}

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

.theme-toggle {
    position: fixed;
    top: 1rem;
    right: 1rem;
    background: none;
    border: 2px solid rgba(255, 255, 255, 0.5);
    color: white;
    font-size: 1.3rem;
    width: 2.8rem;
    height: 2.8rem;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: border-color 0.3s, background 0.3s;
    z-index: 100;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: white;
}

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

h1 {
    color: var(--title-color);
}

p {
    color: var(--text-color);
}

#generate-btn {
    background-color: var(--btn-bg);
    color: white;
    border: none;
    padding: 1rem 2rem;
    font-size: 1rem;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s, box-shadow 0.3s;
    box-shadow: 0 4px 15px var(--btn-shadow);
}

#generate-btn:hover {
    background-color: var(--btn-hover);
    box-shadow: 0 6px 20px var(--btn-hover-shadow);
}

.lotto-numbers {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.lotto-ball {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.2rem;
    font-weight: bold;
    color: white;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    transition: transform 0.2s;
}

.lotto-ball:hover {
    transform: scale(1.1);
}

.separator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    color: var(--separator-color);
    font-size: 1.5rem;
    font-weight: bold;
    line-height: 1;
}

.bonus-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.bonus-label {
    font-size: 0.65rem;
    font-weight: bold;
    color: var(--bonus-label-color);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.lotto-ball.bonus {
    border: 3px solid #ffd700;
    box-shadow: 0 0 12px rgba(255, 215, 0, 0.6), 0 4px 8px rgba(0, 0, 0, 0.2);
}