* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    color-scheme: light;
    --page-bg: #f0f2f5;
    --card-bg: #ffffff;
    --text: #2c3e50;
    --muted: #7f8c8d;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --ball-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    --button-shadow: 0 5px 15px rgba(52, 152, 219, 0.4);
    --button-shadow-hover: 0 8px 20px rgba(52, 152, 219, 0.5);
    --button-shadow-active: 0 2px 10px rgba(52, 152, 219, 0.4);
    --button-grad: linear-gradient(45deg, #3498db, #8e44ad);
    --button-grad-hover: linear-gradient(45deg, #2980b9, #9b59b6);
    --toggle-bg: #eef2f6;
    --toggle-text: #2c3e50;
    --toggle-border: rgba(44, 62, 80, 0.15);
}

html[data-theme="dark"] {
    color-scheme: dark;
    --page-bg: #0f141a;
    --card-bg: #1b2430;
    --text: #e6edf5;
    --muted: #a2adbb;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
    --ball-shadow: 0 6px 16px rgba(0, 0, 0, 0.4);
    --button-shadow: 0 5px 15px rgba(52, 152, 219, 0.35);
    --button-shadow-hover: 0 8px 20px rgba(52, 152, 219, 0.45);
    --button-shadow-active: 0 2px 10px rgba(52, 152, 219, 0.3);
    --button-grad: linear-gradient(45deg, #3d9be0, #6b44ad);
    --button-grad-hover: linear-gradient(45deg, #2f7fbe, #7c50b5);
    --toggle-bg: #2b3643;
    --toggle-text: #e6edf5;
    --toggle-border: rgba(230, 237, 245, 0.15);
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--page-bg);
    color: var(--text);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.app-container {
    background-color: var(--card-bg);
    border-radius: 20px;
    box-shadow: var(--shadow);
    padding: 40px;
    width: 90%;
    max-width: 600px;
    text-align: center;
}

header {
    margin-bottom: 30px;
}

.header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 10px;
}

.title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 0;
    text-align: left;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--muted);
    text-align: left;
}

.theme-toggle {
    border: 1px solid var(--toggle-border);
    background-color: var(--toggle-bg);
    color: var(--toggle-text);
    border-radius: 999px;
    padding: 8px 16px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.3s ease, background-color 0.3s ease;
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08);
}

.theme-toggle:hover {
    transform: translateY(-1px);
}

.theme-toggle:active {
    transform: translateY(0);
}

main {
    margin-bottom: 30px;
}

.lotto-numbers-container {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 30px;
    min-height: 80px;
}

.lotto-ball {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 600;
    color: #ffffff;
    box-shadow: var(--ball-shadow);
    transition: transform 0.3s ease, background-color 0.3s ease;
}

.lotto-ball:hover {
    transform: translateY(-5px);
}

.generate-button {
    background: var(--button-grad);
    color: white;
    border: none;
    border-radius: 30px;
    padding: 15px 30px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    box-shadow: var(--button-shadow);
}

.generate-button:hover {
    background: var(--button-grad-hover);
    box-shadow: var(--button-shadow-hover);
    transform: translateY(-2px);
}

.generate-button:active {
    transform: translateY(1px);
    box-shadow: var(--button-shadow-active);
}

.button-text {
    line-height: 1;
}

.button-icon {
    display: flex;
    align-items: center;
}

footer {
    font-size: 0.9rem;
    color: var(--muted);
}

@media (max-width: 480px) {
    .app-container {
        padding: 30px;
    }

    .header-row {
        flex-direction: column;
        align-items: flex-start;
    }

    .title {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .lotto-ball {
        width: 50px;
        height: 50px;
        font-size: 1.3rem;
    }

    .generate-button {
        padding: 12px 25px;
        font-size: 1.1rem;
    }
}