:root {
    --bg-color: oklch(0.96 0.01 250);
    --container-bg: oklch(1 0 0);
    --text-color: oklch(0.2 0.01 250);
    --shadow: 0 8px 32px oklch(0 0 0 / 0.1);
    --button-bg: oklch(0.6 0.2 250);
    --button-hover: oklch(0.5 0.2 250);
    --button-text: oklch(1 0 0);
    --toggle-bg: oklch(0.9 0.01 250);
    --toggle-icon: oklch(0.2 0.01 250);
    --input-bg: oklch(0.98 0.01 250);
    --input-border: oklch(0.9 0.01 250);
    --divider: oklch(0.9 0.01 250);
}

[data-theme="dark"] {
    --bg-color: oklch(0.15 0.01 250);
    --container-bg: oklch(0.2 0.01 250);
    --text-color: oklch(0.9 0.01 250);
    --shadow: 0 8px 32px oklch(0 0 0 / 0.5);
    --button-bg: oklch(0.5 0.2 250);
    --button-hover: oklch(0.6 0.2 250);
    --button-text: oklch(0.95 0.01 250);
    --toggle-bg: oklch(0.3 0.01 250);
    --toggle-icon: oklch(0.9 0.01 250);
    --input-bg: oklch(0.25 0.01 250);
    --input-border: oklch(0.35 0.01 250);
    --divider: oklch(0.3 0.01 250);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 40px 0;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    position: relative;
    text-align: center;
    background: var(--container-bg);
    padding: 40px;
    border-radius: 24px;
    box-shadow: var(--shadow);
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
    width: 90%;
    max-width: 500px;
}

#theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--toggle-bg);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.2rem;
    color: var(--toggle-icon);
    transition: transform 0.2s ease, background-color 0.3s ease;
}

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

h1 {
    color: var(--text-color);
    font-size: 2.2rem;
    margin-bottom: 30px;
    font-weight: 800;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    font-weight: 700;
    color: var(--text-color);
}

#generate-button, .submit-button {
    background-color: var(--button-bg);
    color: var(--button-text);
    border: none;
    padding: 16px 32px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 12px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.1s ease, box-shadow 0.3s ease;
    width: 100%;
    box-shadow: 0 4px 12px var(--button-bg / 0.3);
}

#generate-button:hover, .submit-button:hover {
    background-color: var(--button-hover);
    box-shadow: 0 6px 16px var(--button-bg / 0.4);
}

#generate-button:active, .submit-button:active {
    transform: scale(0.98);
}

.divider {
    height: 1px;
    background-color: var(--divider);
    margin: 40px 0;
    width: 100%;
}

.form-group {
    text-align: left;
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.8;
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border-radius: 10px;
    border: 1px solid var(--input-border);
    background-color: var(--input-bg);
    color: var(--text-color);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    box-sizing: border-box;
}

.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--button-bg);
    box-shadow: 0 0 0 3px var(--button-bg / 0.1);
}

lotto-numbers {
    display: block;
    margin-bottom: 30px;
}

@media (max-width: 600px) {
    .container {
        padding: 30px 20px;
    }

    h1 {
        font-size: 1.8rem;
    }

    #theme-toggle {
        top: 15px;
        right: 15px;
    }
}