:root {
    --bg-color: #f8f9fa;
    --container-bg: #ffffff;
    --text-color: #212529;
    --text-muted: #6c757d;
    --shadow-color: rgba(0, 0, 0, 0.08);
    --button-bg: #28a745;
    --button-hover: #218838;
    --number-bg: #e9ecef;
    --nav-bg: #ffffff;
    --accent-color: #007bff;
}

body.dark-mode {
    --bg-color: #1a1a1a;
    --container-bg: #2d2d2d;
    --text-color: #f8f9fa;
    --text-muted: #adb5bd;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --number-bg: #3d3d3d;
    --nav-bg: #2d2d2d;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    margin: 0;
    transition: background-color 0.3s, color 0.3s;
    line-height: 1.6;
}

/* Header & Nav */
.main-header {
    background-color: var(--nav-bg);
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px var(--shadow-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--button-bg);
}

nav a {
    margin: 0 1rem;
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.2s;
}

nav a:hover {
    color: var(--button-bg);
}

.theme-toggle {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--text-color);
}

/* Layout */
.content-wrapper {
    max-width: 900px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.container {
    background-color: var(--container-bg);
    padding: 3rem;
    border-radius: 20px;
    box-shadow: 0 15px 40px var(--shadow-color);
    text-align: center;
    margin-bottom: 2rem;
}

.subtitle {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

/* Lottery Numbers */
.numbers {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--number-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    box-shadow: inset 0 2px 4px var(--shadow-color);
    transition: transform 0.3s, background-color 0.4s;
}

/* Info Section */
.info-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin: 4rem 0;
}

.info-card {
    background-color: var(--container-bg);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 4px 15px var(--shadow-color);
}

.info-card h2 {
    color: var(--button-bg);
    margin-top: 0;
}

/* Ad Containers */
.ad-container {
    margin: 2rem 0;
    background-color: var(--number-bg);
    border-radius: 12px;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Footer */
.main-footer {
    background-color: var(--nav-bg);
    padding: 3rem 1rem;
    margin-top: 5rem;
    text-align: center;
    border-top: 1px solid var(--shadow-color);
}

.footer-links a {
    margin: 0 1rem;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
}

/* Buttons */
button#generate, .submit-btn {
    background-color: var(--button-bg);
    color: white;
    padding: 1.2rem 3rem;
    border: none;
    border-radius: 12px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, background-color 0.2s;
    width: 100%;
}

button#generate:hover {
    background-color: var(--button-hover);
    transform: translateY(-2px);
}

/* Forms */
.contact-section form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

input, textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--number-bg);
    border-radius: 10px;
    background-color: var(--bg-color);
    color: var(--text-color);
    box-sizing: border-box;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}

.modal-content {
    background-color: var(--container-bg);
    margin: 10% auto;
    padding: 2.5rem;
    border-radius: 20px;
    width: 80%;
    max-width: 700px;
    max-height: 70vh;
    overflow-y: auto;
    position: relative;
}

.close-modal {
    position: absolute;
    right: 1.5rem;
    top: 1rem;
    font-size: 2rem;
    cursor: pointer;
}

@media (max-width: 768px) {
    .info-section { grid-template-columns: 1fr; }
    .numbers { gap: 0.5rem; }
    .number { width: 50px; height: 50px; font-size: 1.2rem; }
}