@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600&family=Noto+Sans+KR:wght@400;700&display=swap');

:root {
    --background-color: #f8f9fa;
    --card-background: #ffffff;
    --text-color: #212529;
    --primary-color: #28a745;
    --secondary-color: #6c757d;
    --ball-background: #e9ecef;
    --ball-shadow: 0 4px 8px rgba(0,0,0,0.1);
    --nav-bg: #ffffff;
    --border-color: #dee2e6;
}

[data-theme="dark"] {
    --background-color: #121212;
    --card-background: #1e1e1e;
    --text-color: #e0e0e0;
    --primary-color: #2ecc71;
    --ball-background: #333333;
    --ball-shadow: 0 8px 16px rgba(0,0,0,0.4);
    --nav-bg: #1e1e1e;
    --border-color: #333333;
}

* {
    box-sizing: border-box;
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans KR', 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Navbar */
#navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: var(--nav-bg);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 10px 0;
}

.nav-container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.nav-links {
    list-style: none;
    display: flex;
    gap: 20px;
    margin: 0;
    padding: 0;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--primary-color);
}

#theme-toggle {
    background: var(--ball-background);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.85rem;
}

/* Header */
header {
    margin-top: 100px;
    text-align: center;
    padding: 40px 20px;
}

h1 {
    font-size: 2.8rem;
    margin-bottom: 10px;
    color: var(--primary-color);
}

/* Main Layout */
main {
    width: 90%;
    max-width: 900px;
    margin: 0 auto;
}

.card, .content-card {
    background-color: var(--card-background);
    border-radius: 16px;
    padding: 40px;
    margin-bottom: 40px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
    border: 1px solid var(--border-color);
}

/* Generator */
#generator-section {
    display: flex;
    flex-direction: column;
    align-items: center;
}

#lotto-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
    margin-bottom: 30px;
}

.lotto-ball {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background-color: var(--ball-background);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    font-weight: 700;
    box-shadow: var(--ball-shadow);
    transition: transform 0.2s;
}

#generate-btn {
    background-color: var(--primary-color);
    color: #ffffff;
    border: none;
    padding: 16px 40px;
    font-size: 1.2rem;
    font-weight: 700;
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 10px 20px rgba(40, 167, 69, 0.2);
    transition: all 0.3s;
}

#generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 30px rgba(40, 167, 69, 0.3);
}

/* Tips Grid */
.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.tip-item {
    background-color: var(--background-color);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.tip-item h4 {
    color: var(--primary-color);
    margin-top: 0;
}

/* Forms */
#contact-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--background-color);
    color: var(--text-color);
}

#submit-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px;
    border-radius: 8px;
    font-weight: 700;
    cursor: pointer;
}

/* Footer */
footer {
    background-color: var(--card-background);
    border-top: 1px solid var(--border-color);
    padding: 60px 0;
    margin-top: 80px;
}

.footer-container {
    width: 90%;
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.footer-links {
    margin: 15px 0;
}

.footer-links a {
    color: var(--secondary-color);
    text-decoration: none;
    margin: 0 10px;
}

.footer-disclaimer {
    margin-top: 30px;
    color: var(--secondary-color);
    font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    h1 {
        font-size: 2rem;
    }

    .lotto-ball {
        width: 55px;
        height: 55px;
        font-size: 1.3rem;
    }

    .card, .content-card {
        padding: 20px;
    }
}