@import url('https://fonts.googleapis.com/css2?family=Nanum+Gothic&display=swap');

/* --- Theme Variables --- */
:root[data-theme='light'] {
    --bg-color: #f0f2f5;
    --container-bg-color: white;
    --text-color: #333;
    --header-color: #4a4a4a;
    --game-row-bg-color: #f8f9fa;
    --slider-bg-color: #ccc;
}

:root[data-theme='dark'] {
    --bg-color: #2c2c2c;
    --container-bg-color: #3e3e3e;
    --text-color: #f1f1f1;
    --header-color: #f1f1f1;
    --game-row-bg-color: #2c2c2c;
    --slider-bg-color: #555;
}

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

.container {
    background-color: var(--container-bg-color);
    padding: 2rem 3rem;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    text-align: center;
    width: 90%;
    max-width: 500px;
    transition: background-color 0.3s;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

header h1 {
    color: var(--header-color);
    font-size: 2rem;
    margin: 0;
}

/* --- Theme Switcher --- */
.theme-switcher {
    display: flex;
    align-items: center;
}
.switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}
.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}
.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--slider-bg-color);
    transition: .4s;
}
.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
}
input:checked + .slider {
    background-color: #a777e3;
}
input:checked + .slider:before {
    transform: translateX(26px);
}
.slider.round {
    border-radius: 34px;
}
.slider.round:before {
    border-radius: 50%;
}

/* --- Main Content --- */
#generate-btn {
    background: linear-gradient(135deg, #6e8efb, #a777e3);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 50px;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: bold;
    transition: transform 0.2s, box-shadow 0.2s;
    margin-bottom: 2rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

#generate-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}

#lotto-numbers-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.game-row {
    background-color: var(--game-row-bg-color);
    border-radius: 10px;
    padding: 1rem;
    display: flex;
    justify-content: space-around;
    align-items: center;
    animation: fadeIn 0.5s ease-in-out;
    transition: background-color 0.3s;
}

.lotto-ball {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    font-weight: bold;
    font-size: 1.1rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.15);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}