:root {
    --font-family: 'Nanum Gothic', sans-serif;
}

[data-theme='light'] {
    --background-color: oklch(98.5% 0.01 240);
    --container-bg-color: oklch(100% 0 0);
    --text-color: oklch(25% 0.03 260);
    --shadow-color-light: oklch(60% 0.05 260 / 0.1);
    --shadow-color-dark: oklch(30% 0.08 260 / 0.15);
    --accent-color: oklch(65% 0.25 260);
    --button-text-color: white;
}

[data-theme='dark'] {
    --background-color: oklch(20% 0.03 260);
    --container-bg-color: oklch(25% 0.03 260);
    --text-color: oklch(95% 0.01 240);
    --shadow-color-light: oklch(0% 0 0 / 0.2);
    --shadow-color-dark: oklch(0% 0 0 / 0.4);
    --accent-color: oklch(75% 0.25 260);
    --button-text-color: oklch(20% 0.03 260);
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
    display: grid;
    place-content: center;
    min-height: 100vh;
    margin: 0;
    background-image: url('data:image/svg+xml,%3Csvg width="6" height="6" viewBox="0 0 6 6" xmlns="http://www.w3.org/2000/svg"%3E%3Cg fill="%23000000" fill-opacity="0.02" fill-rule="evenodd"%3E%3Cpath d="M5 0h1L0 6V5zM6 5v1H5z"/%3E%3C/g%3E%3C/svg%3E');
    transition: background-color 0.3s, color 0.3s;
}

.container {
    background-color: var(--container-bg-color);
    padding: 2.5rem 3rem;
    border-radius: 20px;
    box-shadow: 
        0 4px 6px -1px var(--shadow-color-light),
        0 2px 4px -2px var(--shadow-color-light),
        0 10px 25px -3px var(--shadow-color-dark);
    text-align: center;
    max-width: 500px;
    width: 90%;
    transition: background-color 0.3s;
}

h1 {
    font-size: 2.5rem;
    margin-top: 0;
    font-weight: 700;
    color: var(--accent-color);
}

p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

.lotto-numbers-container {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
}

.lotto-number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: grid;
    place-content: center;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--button-text-color);
    box-shadow: 0 5px 10px rgba(0,0,0,0.1);
    animation: pop-in 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

@keyframes pop-in {
    from { transform: scale(0); opacity: 0; }
    to   { transform: scale(1); opacity: 1; }
}

.generate-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--accent-color);
    color: var(--button-text-color);
    border: none;
    padding: 1rem 2rem;
    font-size: 1.2rem;
    font-weight: 700;
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 4px 15px -5px oklch(65% 0.25 260 / 0.6);
    transition: transform 0.2s, box-shadow 0.2s, background-color 0.3s;
}

.generate-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 7px 20px -5px oklch(65% 0.25 260 / 0.8);
}

.generate-btn:active {
    transform: translateY(-1px);
    box-shadow: 0 4px 10px -5px oklch(65% 0.25 260 / 0.7);
}

.generate-btn svg {
    transition: transform 0.4s;
    fill: var(--button-text-color);
}

.generate-btn:hover svg {
    transform: rotate(360deg);
}

/* Theme Switch */
.theme-switch-container {
    position: absolute;
    top: 1rem;
    right: 1rem;
}

.theme-switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

.theme-switch input { 
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    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: var(--accent-color);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}


.number-color-1 { background: oklch(80% 0.2 85); } /* 1-10 */
.number-color-2 { background: oklch(75% 0.2 230); } /* 11-20 */
.number-color-3 { background: oklch(70% 0.25 15); } /* 21-30 */
.number-color-4 { background: oklch(65% 0.05 260); } /* 31-40 */
.number-color-5 { background: oklch(75% 0.22 145); } /* 41-45 */