:root {
    --bg-color: #121212;
    --text-color: #ffffff;
    --number-bg: #1e1e1e;
    --number-text: #ffffff;
    --btn-bg: #4CAF50;
    --btn-hover: #45a049;
    --toggle-btn-bg: #333;
    --toggle-btn-text: #fff;
    --container-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    --header-bg: rgba(18, 18, 18, 0.9);
    --footer-bg: #0a0a0a;
}

[data-theme="light"] {
    --bg-color: #f8f9fa;
    --text-color: #212529;
    --number-bg: #ffffff;
    --number-text: #212529;
    --btn-bg: #28a745;
    --btn-hover: #218838;
    --toggle-btn-bg: #e9ecef;
    --toggle-btn-text: #212529;
    --container-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
    --header-bg: rgba(248, 249, 250, 0.9);
    --footer-bg: #e9ecef;
}

* {
    transition: background-color 0.3s, color 0.3s, transform 0.2s;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding-top: 80px;
    line-height: 1.6;
}

header {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: var(--header-bg);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--btn-bg);
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

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

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

.container {
    max-width: 900px;
    margin: 40px auto;
    padding: 4rem;
    background-color: var(--number-bg);
    border-radius: 24px;
    box-shadow: var(--container-shadow);
    text-align: center;
}

h1 {
    font-size: 3rem;
    margin-bottom: 2.5rem;
    font-weight: 900;
    letter-spacing: -0.05em;
}

section {
    padding: 4rem 0;
}

.lotto-numbers {
    display: flex;
    justify-content: center;
    margin-bottom: 3.5rem;
    gap: 1.2rem;
    flex-wrap: wrap;
}

.number {
    background-color: var(--bg-color);
    color: var(--text-color);
    border-radius: 50%;
    width: 70px;
    height: 70px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2rem;
    font-weight: 800;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.1), 0 4px 10px rgba(0,0,0,0.1);
}

#generate-btn {
    background-color: var(--btn-bg);
    color: white;
    padding: 1.2rem 3rem;
    font-size: 1.4rem;
    border: none;
    border-radius: 100px;
    cursor: pointer;
    font-weight: 700;
    box-shadow: 0 10px 25px rgba(76, 175, 80, 0.3);
}

#generate-btn:hover {
    background-color: var(--btn-hover);
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(76, 175, 80, 0.4);
}

#theme-toggle {
    background-color: var(--toggle-btn-bg);
    color: var(--toggle-btn-text);
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: 50px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.85rem;
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    text-align: left;
    margin-top: 2rem;
}

.blog-card {
    background-color: var(--bg-color);
    padding: 2rem;
    border-radius: 16px;
    border: 1px solid var(--toggle-btn-bg);
}

.blog-card h4 {
    margin-top: 0;
    font-size: 1.25rem;
    color: var(--btn-bg);
}

.legal-section {
    text-align: left;
    font-size: 0.9rem;
    line-height: 1.8;
}

footer {
    background-color: var(--footer-bg);
    padding: 4rem 0;
    text-align: center;
    margin-top: 8rem;
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.8;
}

.footer-links {
    margin-bottom: 2rem;
    display: flex;
    justify-content: center;
    gap: 2rem;
}

.footer-links a {
    color: var(--text-color);
    text-decoration: none;
}

.upload-container {
    margin: 2rem 0;
}

#image-preview-container {
    width: 300px;
    height: 300px;
    border: 3px dashed var(--toggle-btn-bg);
    border-radius: 20px;
    margin: 1.5rem auto;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

#image-preview {
    max-width: 100%;
    max-height: 100%;
}

.submit-btn {
    background-color: var(--btn-bg);
    color: #fff;
    border: none;
    padding: 1rem 2rem;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 600;
}

@media (max-width: 768px) {
    .container {
        padding: 2rem;
        margin: 20px;
    }
    h1 { font-size: 2.2rem; }
    .nav-links { display: none; }
}