@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@700&family=Poppins:wght@300;400&display=swap');

:root {
    --background-color: #1A1A1A;
    --card-color: #2C2C2C;
    --primary-glow-color: #00FFC2;
    --primary-glow-shadow: rgba(0, 255, 194, 0.4);
    --text-color: #E0E0E0;
    --light-text-color: #B0B0B0;
    --border-color: rgba(255, 255, 255, 0.1);
    --ball-text-color: #1A1A1A;
    --pattern-color: #9C92AC;
    --pattern-opacity: 0.04;
}

body[data-theme="light"] {
    --background-color: #F6F2EA;
    --card-color: #FFFFFF;
    --primary-glow-color: #FF7A00;
    --primary-glow-shadow: rgba(255, 122, 0, 0.35);
    --text-color: #1F1B16;
    --light-text-color: #6B5F54;
    --border-color: rgba(31, 27, 22, 0.12);
    --ball-text-color: #1F1B16;
    --pattern-color: #BFAE9A;
    --pattern-opacity: 0.08;
}

body {
    font-family: 'Poppins', 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: 20px;
    box-sizing: border-box;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%239C92AC' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    transition: background-color 0.3s ease, color 0.3s ease;
}

body[data-theme="light"] {
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23BFAE9A' fill-opacity='0.08'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.container {
    background: var(--card-color);
    border-radius: 20px;
    padding: 40px;
    width: 100%;
    max-width: 600px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

header h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: 2.5rem;
    color: var(--primary-glow-color);
    margin: 0;
    text-shadow: 0 0 10px var(--primary-glow-shadow), 0 0 20px var(--primary-glow-shadow);
}

.theme-toggle {
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    font-size: 0.95rem;
    background: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 999px;
    padding: 10px 18px;
    cursor: pointer;
    transition: transform 0.2s ease, border-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.theme-toggle:hover {
    transform: translateY(-1px);
    border-color: var(--primary-glow-color);
    box-shadow: 0 0 12px var(--primary-glow-shadow);
}

.controls-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.controls-container label {
    font-size: 1rem;
    color: var(--light-text-color);
}

#sets-input {
    background: var(--background-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    border-radius: 8px;
    padding: 10px 15px;
    font-size: 1rem;
    width: 80px;
    text-align: center;
    transition: all 0.3s ease;
}

#sets-input:focus {
    outline: none;
    border-color: var(--primary-glow-color);
    box-shadow: 0 0 10px var(--primary-glow-shadow);
}

#generate-btn {
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    font-size: 1.2rem;
    background-color: var(--primary-glow-color);
    color: #1A1A1A;
    border: none;
    border-radius: 10px;
    padding: 15px 30px;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
    max-width: 300px;
    margin: 0 auto;
    box-shadow: 0 0 15px var(--primary-glow-shadow), 0 0 25px var(--primary-glow-shadow);
}

#generate-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 20px var(--primary-glow-shadow), 0 5px 30px var(--primary-glow-shadow);
}

.numbers-display {
    margin-top: 30px;
    display: grid;
    gap: 20px;
}

.number-set {
    background: var(--background-color);
    padding: 20px;
    border-radius: 15px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
}

.number-ball {
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--ball-text-color);
    font-size: 1.3rem;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.4), 0 2px 4px rgba(0,0,0,0.2);
}

@media (max-width: 480px) {
    .container {
        padding: 20px;
    }
    header h1 {
        font-size: 2rem;
    }
    .number-ball {
        width: 40px;
        height: 40px;
        font-size: 1.1rem;
    }
    .number-set {
        gap: 10px;
    }
}