:root {
    --primary-color: #FF2E63;
    --secondary-color: #08D9D6;
    --background-color: #111827;
    --text-color: #E5EEF6;
    --card-background: rgba(17, 24, 39, 0.84);
    --muted-text-color: rgba(229, 238, 246, 0.72);
    --button-text-color: #F9FBFF;
    --button-hover-color: #E82256;
    --number-text-color: #111827;
    --surface-border-color: rgba(255, 255, 255, 0.08);
    --shadow-color: rgba(0, 0, 0, 0.28);
    --background-glow: rgba(8, 217, 214, 0.18);
    --pattern-color: rgba(255, 255, 255, 0.04);
    --theme-toggle-background: rgba(255, 255, 255, 0.08);
    --theme-toggle-border: rgba(255, 255, 255, 0.12);
}

:root[data-theme="light"] {
    --primary-color: #E3466B;
    --secondary-color: #0FA6A6;
    --background-color: #F5EFE4;
    --text-color: #1D2433;
    --card-background: rgba(255, 251, 245, 0.9);
    --muted-text-color: rgba(29, 36, 51, 0.68);
    --button-text-color: #FFF9F1;
    --button-hover-color: #CC2F58;
    --number-text-color: #FFFDF8;
    --surface-border-color: rgba(29, 36, 51, 0.08);
    --shadow-color: rgba(77, 52, 32, 0.14);
    --background-glow: rgba(227, 70, 107, 0.14);
    --pattern-color: rgba(29, 36, 51, 0.04);
    --theme-toggle-background: rgba(255, 255, 255, 0.7);
    --theme-toggle-border: rgba(29, 36, 51, 0.08);
}

body {
    font-family: "Trebuchet MS", "Segoe UI", sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 24px;
    background-image:
        radial-gradient(circle at top left, var(--background-glow), transparent 34%),
        linear-gradient(45deg, var(--pattern-color) 25%, transparent 25%, transparent 50%, var(--pattern-color) 50%, var(--pattern-color) 75%, transparent 75%, transparent);
    background-size: auto, 54px 54px;
    transition: background-color 0.35s ease, color 0.35s ease;
}

.container {
    background-color: var(--card-background);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 18px 48px var(--shadow-color);
    text-align: center;
    max-width: 500px;
    width: 90%;
    border: 1px solid var(--surface-border-color);
    backdrop-filter: blur(14px);
    transition: background-color 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}

.toolbar {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    margin-bottom: 18px;
}

.eyebrow {
    margin: 0;
    color: var(--muted-text-color);
    font-size: 0.9rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
    margin: 0 0 20px;
    text-shadow: 0 0 10px var(--primary-color);
}

.lotto-numbers {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
    margin: 30px 0;
}
.lotto-number {
    background-color: var(--secondary-color);
    color: var(--number-text-color);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.8rem;
    font-weight: bold;
    box-shadow: 0 5px 15px rgba(8, 217, 214, 0.4);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    animation: appear 0.5s ease-out forwards;
}

.lotto-number:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 25px rgba(8, 217, 214, 0.6);
}

.theme-toggle {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 1000;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background-color: var(--theme-toggle-background);
    color: var(--text-color);
    border: 1px solid var(--theme-toggle-border);
    border-radius: 999px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 700;
    transition: transform 0.2s ease, background-color 0.3s ease, border-color 0.3s ease;
    backdrop-filter: blur(8px);
}

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

.theme-toggle__icon {
    font-size: 1rem;
}

.generate-btn {
    background-color: var(--primary-color);
    color: var(--button-text-color);
    border: none;
    padding: 15px 30px;
    font-size: 1.2rem;
    font-weight: bold;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    box-shadow: 0 5px 15px rgba(255, 46, 99, 0.4);
}

.generate-btn:hover {
    background-color: var(--button-hover-color);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 46, 99, 0.6);
}

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

@keyframes appear {
    from {
        opacity: 0;
        transform: scale(0.5);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@media (max-width: 600px) {
    .container {
        padding: 20px;
    }
    .toolbar {
        align-items: flex-start;
        flex-direction: column;
    }
    h1 {
        font-size: 2rem;
    }
    .lotto-number {
        width: 50px;
        height: 50px;
        font-size: 1.5rem;
    }
    .generate-btn {
        padding: 12px 25px;
        font-size: 1rem;
    }
}