:root {
    --primary-color: #FF6B6B;
    --secondary-color: #FFE66D;
    --background-color: #F7F7F7;
    --text-color: #333;
    --container-bg: white;
    --bg-pattern-color: #ccc;
    --navbar-bg: white;
}

body.dark {
    --background-color: #1a1a2e;
    --text-color: #e0e0e0;
    --container-bg: #16213e;
    --bg-pattern-color: #0f3460;
    --navbar-bg: #16213e;
}

body {
    background-color: var(--background-color);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding-top: 70px;
    box-sizing: border-box;
    background-image: linear-gradient(45deg, var(--bg-pattern-color) 25%, transparent 25%),
                      linear-gradient(-45deg, var(--bg-pattern-color) 25%, transparent 25%),
                      linear-gradient(45deg, transparent 75%, var(--bg-pattern-color) 75%),
                      linear-gradient(-45deg, transparent 75%, var(--bg-pattern-color) 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    transition: background-color 0.3s, color 0.3s;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background-color: var(--navbar-bg);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    z-index: 200;
    transition: background-color 0.3s;
}

.nav-logo {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: 24px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-color);
    font-size: 15px;
    padding-bottom: 2px;
    transition: color 0.2s;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
}

#theme-toggle {
    background-color: transparent;
    color: var(--text-color);
    border: 2px solid var(--primary-color);
    padding: 6px 14px;
    font-size: 13px;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s;
}

#theme-toggle:hover {
    background-color: var(--primary-color);
    color: white;
}

/* Lotto */
.container {
    text-align: center;
    background-color: var(--container-bg);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1), 0 6px 6px rgba(0, 0, 0, 0.15);
    transition: background-color 0.3s;
}

h1 {
    color: var(--text-color);
    margin-bottom: 20px;
}

#generate-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 18px;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.3s, box-shadow 0.3s;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

#generate-btn:hover {
    background-color: #FF4747;
    box-shadow: 0 7px 14px rgba(0, 0, 0, 0.1), 0 3px 6px rgba(0, 0, 0, 0.08);
}

#numbers-container {
    display: flex;
    justify-content: center;
    margin-top: 30px;
}