:root {
    /* Color Palette */
    --accent-color: #007aff;
    --accent-color-dark: #00aaff;
    
    /* Light Theme */
    --bg-color-light: #f4f7f9;
    --card-bg-color-light: #ffffff;
    --text-color-light: #212529;
    --subtle-text-light: #6c757d;
    --button-text-color-light: #ffffff;
    --number-bg-color-light: #e9f5ff;

    /* Dark Theme */
    --bg-color-dark: #121212;
    --card-bg-color-dark: #1e1e1e;
    --text-color-dark: #e0e0e0;
    --subtle-text-dark: #adb5bd;
    --button-text-color-dark: #ffffff;
    --number-bg-color-dark: #2c2c2e;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: var(--bg-color-light);
    color: var(--text-color-light);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* --- Dark Mode --- */
body[data-theme='dark'] {
    background-color: var(--bg-color-dark);
    color: var(--text-color-dark);
}

body[data-theme='dark'] .card {
    background-color: var(--card-bg-color-dark);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
}

body[data-theme='dark'] h1 {
    color: var(--text-color-dark);
}

body[data-theme='dark'] .number {
    background-color: var(--number-bg-color-dark);
    color: var(--accent-color-dark);
    box-shadow: 0 4px 12px rgba(0, 170, 255, 0.15);
}

body[data-theme='dark'] #language-select {
    background-color: #2c2c2e;
    color: var(--text-color-dark);
    border-color: #495057;
}

/* --- Main Card --- */
.card {
    background-color: var(--card-bg-color-light);
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 12px 40px rgba(0, 122, 255, 0.1);
    text-align: center;
    width: 90%;
    max-width: 420px;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

/* --- Header & Controls --- */
.header-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

#language-select {
    border: 1px solid #ced4da;
    border-radius: 8px;
    padding: 0.4rem 0.6rem;
    font-size: 0.9rem;
    background-color: var(--card-bg-color-light);
    color: var(--text-color-light);
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

/* --- Theme Switcher --- */
.theme-switcher {
    position: relative;
}

#theme-toggle {
    display: none; /* Hide the checkbox */
}

.theme-switcher label {
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    transition: background-color 0.3s ease;
}

.theme-switcher .material-symbols-outlined {
    font-size: 24px;
    position: absolute;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.sun {
    color: #f39c12;
    opacity: 1;
    transform: scale(1) rotate(0deg);
}

.moon {
    color: #f1c40f;
    opacity: 0;
    transform: scale(0) rotate(-90deg);
}

body[data-theme='dark'] .sun {
    opacity: 0;
    transform: scale(0) rotate(90deg);
}

body[data-theme='dark'] .moon {
    opacity: 1;
    transform: scale(1) rotate(0deg);
}


/* --- Typography --- */
h1 {
    color: var(--text-color-light);
    margin-bottom: 1.5rem;
    font-size: 1.75rem;
    font-weight: 600;
}

/* --- Button --- */
button {
    padding: 0.8rem 2rem;
    border: none;
    border-radius: 12px;
    background-color: var(--accent-color);
    color: var(--button-text-color-light);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.2s;
}

button:hover {
    opacity: 0.85;
}

button:active {
    transform: scale(0.97);
}


/* --- Lotto Numbers Display --- */
#lotto-numbers-container {
    margin-top: 2rem;
    padding: 1rem;
    background-color: rgba(0,0,0,0.02);
    border-radius: 12px;
}
body[data-theme='dark'] #lotto-numbers-container {
    background-color: rgba(255,255,255,0.05);
}

#lotto-numbers {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    align-items: center;
    min-height: 50px;
}

.number {
    width: 48px;
    height: 48px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    background-color: var(--number-bg-color-light);
    color: var(--accent-color);
    font-size: 1.3rem;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(0, 122, 255, 0.1);
    transition: background-color 0.3s, color 0.3s, box-shadow 0.3s;
}