:root {
    --bg-color: #fcfcfa; /* Creamy White */
    --card-bg: #ffffff;
    --text-color: #1a1a1a; /* Charcoal */
    --accent-color: #0047ff; /* Electric Blue */
    --secondary-text: #666666;
    --button-bg: #1a1a1a;
    --button-hover: #333333;
    --number-bg: #f5f5f7;
    --shadow: rgba(0, 0, 0, 0.05);
    --border-radius: 32px;
    --font-heading: 'Playfair Display', serif;
    --font-body: 'Inter', sans-serif;
    --header-height: 80px;
}

body.dark-mode {
    --bg-color: #0a0a0a;
    --card-bg: #141414;
    --text-color: #f5f5f7;
    --accent-color: #3d7eff;
    --secondary-text: #a1a1a6;
    --button-bg: #f5f5f7;
    --button-hover: #ffffff;
    --number-bg: #1c1c1e;
    --shadow: rgba(0, 0, 0, 0.4);
}

* {
    box-sizing: border-box;
}

body {
    font-family: var(--font-body);
    color: var(--text-color);
    background-color: var(--bg-color);
    margin: 0;
    line-height: 1.6;
    transition: background-color 0.5s ease, color 0.5s ease;
    padding-top: var(--header-height);
}

/* Header & Nav */
#main-header {
    position: fixed;
    top: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgba(252, 252, 250, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    display: flex;
    justify-content: center;
    border-bottom: 1px solid var(--shadow);
}

body.dark-mode #main-header {
    background-color: rgba(10, 10, 10, 0.8);
}

.nav-container {
    width: 100%;
    max-width: 1200px;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 30px;
    margin: 0;
    padding: 0;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-size: 0.9rem;
    font-weight: 600;
    transition: color 0.3s ease;
}

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

/* Layouts */
.centered-layout {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - var(--header-height) - 160px);
    padding: 40px 20px;
}

.centered-layout #lotto-machine {
    width: 100%;
    max-width: 800px;
    text-align: center;
}

.single-column-layout {
    max-width: 800px;
    margin: 60px auto;
    padding: 0 40px;
}

.single-column-layout .ui-container {
    width: 100%;
}

.ui-container {
    background-color: var(--card-bg);
    padding: 60px;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 20px var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.ui-container:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 40px var(--shadow);
}

/* Typography */
.display-title {
    font-family: var(--font-heading);
    font-size: 4rem;
    margin: 0 0 20px 0;
    letter-spacing: -2px;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--secondary-text);
    margin-bottom: 40px;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    margin-bottom: 24px;
}

.content-text p {
    margin-bottom: 16px;
    color: var(--secondary-text);
}

/* Lotto Machine Components */
#numbers {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.number {
    width: 64px;
    height: 64px;
    background-color: var(--number-bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.05);
}

#generate-btn {
    background-color: var(--button-bg);
    color: var(--bg-color);
    border: none;
    padding: 20px 48px;
    font-size: 1rem;
    font-weight: 700;
    border-radius: 100px;
    cursor: pointer;
    transition: all 0.3s ease;
}

#generate-btn:hover {
    background-color: var(--button-hover);
    transform: scale(1.02);
}

/* Form Styles */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 16px;
    border-radius: 16px;
    border: 1px solid var(--shadow);
    background-color: var(--number-bg);
    color: var(--text-color);
    font-family: inherit;
    font-size: 0.9rem;
}

#submit-btn {
    width: 100%;
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 16px;
    border-radius: 16px;
    font-weight: 700;
    cursor: pointer;
}

/* Theme Toggle */
#theme-toggle {
    background: none;
    border: 1px solid var(--text-color);
    padding: 8px 20px;
    border-radius: 100px;
    font-family: inherit;
    font-weight: 600;
    font-size: 0.8rem;
    cursor: pointer;
    color: var(--text-color);
}

/* Footer */
#main-footer {
    padding: 80px 40px;
    border-top: 1px solid var(--shadow);
    text-align: center;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-links {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 24px;
    padding: 0;
    margin-top: 20px;
}

.footer-links a {
    text-decoration: none;
    color: var(--secondary-text);
    font-size: 0.85rem;
}

/* Mobile Responsiveness */
@media (max-width: 600px) {
    .nav-links {
        display: none;
    }
    .centered-layout, .single-column-layout {
        padding: 0 20px;
    }
    .display-title {
        font-size: 2.5rem;
    }
    .ui-container {
        padding: 40px 20px;
    }
}