:root {
    --primary-color: #4a90e2;
    --secondary-color: #f5a623;
    --background-color: #f0f4f8;
    --surface-color: #ffffff;
    --text-color: #333;
    --heading-color: #4a90e2;
    --button-text-color: #ffffff;
    --page-gradient: linear-gradient(135deg, #87b6ff, #a2c7ff 45%, #c0d7ff);
    --container-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --toggle-bg: #1f2937;
    --toggle-text: #ffffff;
    --input-bg: #ffffff;
    --input-border: #d1d5db;
}

body.dark-mode {
    --primary-color: #6ca8ff;
    --secondary-color: #f5a623;
    --background-color: #0f172a;
    --surface-color: #1e293b;
    --text-color: #e2e8f0;
    --heading-color: #93c5fd;
    --button-text-color: #f8fafc;
    --page-gradient: linear-gradient(135deg, #0b1220, #17233b 45%, #1f3558);
    --container-shadow: 0 14px 40px rgba(0, 0, 0, 0.45);
    --toggle-bg: #f8fafc;
    --toggle-text: #0f172a;
    --input-bg: #0f172a;
    --input-border: #334155;
}

body {
    font-family: 'Helvetica Neue', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    margin: 0;
    padding: 32px 0;
    background: var(--page-gradient);
    transition: background 0.3s ease, color 0.3s ease;
}

.lotto-container {
    position: relative;
    background-color: var(--surface-color);
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--container-shadow);
    text-align: center;
    max-width: 500px;
    width: 90%;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

#theme-toggle-btn {
    position: absolute;
    top: 16px;
    right: 16px;
    border: none;
    border-radius: 999px;
    padding: 8px 14px;
    font-size: 0.9rem;
    font-weight: bold;
    cursor: pointer;
    background: var(--toggle-bg);
    color: var(--toggle-text);
    transition: transform 0.2s ease, opacity 0.2s ease;
}

#theme-toggle-btn:hover {
    transform: translateY(-1px);
    opacity: 0.92;
}

h1 {
    color: var(--heading-color);
    margin-bottom: 30px;
    font-size: 2.5rem;
    letter-spacing: 1px;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
}

.numbers-display {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.number-ball {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--button-text-color);
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    transition: transform 0.3s ease, background-color 0.3s ease;
}

#generate-btn {
    background-color: var(--primary-color);
    color: var(--button-text-color);
    border: none;
    padding: 15px 30px;
    border-radius: 50px;
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 15px rgba(74, 144, 226, 0.4);
}

#generate-btn:hover,
#generate-btn:focus {
    background-color: #357ABD;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(74, 144, 226, 0.5);
    outline: none;
}

#generate-btn:active {
    transform: translateY(1px);
    box-shadow: 0 2px 10px rgba(74, 144, 226, 0.4);
}

.contact-section {
    margin-top: 36px;
    text-align: left;
    border-top: 1px solid rgba(148, 163, 184, 0.4);
    padding-top: 24px;
}

.contact-section h2 {
    margin: 0 0 16px;
    font-size: 1.3rem;
    color: var(--heading-color);
}

.contact-form {
    display: grid;
    gap: 10px;
}

.contact-form label {
    font-size: 0.9rem;
    font-weight: 600;
}

.contact-form input,
.contact-form textarea {
    border: 1px solid var(--input-border);
    border-radius: 10px;
    padding: 10px 12px;
    font-size: 0.95rem;
    background: var(--input-bg);
    color: var(--text-color);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: 2px solid rgba(74, 144, 226, 0.25);
    border-color: var(--primary-color);
}

.submit-btn {
    margin-top: 6px;
    border: none;
    border-radius: 10px;
    padding: 12px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    background: var(--primary-color);
    color: var(--button-text-color);
}

.submit-btn:hover {
    filter: brightness(0.96);
}

/* Ball Colors */
.color-1 { background: linear-gradient(145deg, #f7b733, #fc4a1a); }
.color-2 { background: linear-gradient(145deg, #42e695, #3bb2b8); }
.color-3 { background: linear-gradient(145deg, #a770ef, #cf8bf3); }
.color-4 { background: linear-gradient(145deg, #f093fb, #f5576c); }
.color-5 { background: linear-gradient(145deg, #4facfe, #00f2fe); }

@media (max-width: 640px) {
    .lotto-container {
        padding: 24px 18px;
    }

    h1 {
        font-size: 2rem;
    }
}