:root {
    /* Refined Color Palette */
    --primary-color: #6366f1; /* Modern Indigo */
    --secondary-color: #ec4899; /* Trendy Pink */
    --accent-color: #f59e0b; /* Amber for highlight */
    
    --bg-color: #f8fafc;
    --text-color: #1e293b;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    
    --ball-1: #fbbf24; /* 1-10: Amber */
    --ball-2: #38bdf8; /* 11-20: Sky */
    --ball-3: #fb7185; /* 21-30: Rose */
    --ball-4: #94a3b8; /* 31-40: Slate */
    --ball-5: #a3e635; /* 41-45: Lime */
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.875rem;
    --spacing-md: 1.25rem;
    --spacing-lg: 2.5rem;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

body.dark {
    --bg-color: #0f172a;
    --text-color: #f1f5f9;
    --card-bg: #1e293b;
    --border-color: #334155;
    --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.3), 0 8px 10px -6px rgb(0 0 0 / 0.3);
}

body {
    font-family: 'Pretendard Variable', 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    line-height: 1.5;
    transition: background-color 0.4s cubic-bezier(0.4, 0, 0.2, 1), color 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
}

header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.logo-area {
    margin-bottom: var(--spacing-xs);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.badge {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    padding: 2px 10px;
    border-radius: 9999px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

h1 {
    font-size: 1.75rem;
    font-weight: 800;
    margin: 0;
    letter-spacing: -0.025em;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    font-size: 0.95rem;
    color: var(--text-color);
    opacity: 0.7;
    margin: 4px 0;
}

.top-right-nav {
    display: flex;
    gap: 16px;
    align-items: center;
    justify-content: center;
    margin-top: var(--spacing-md);
}

.top-right-nav a {
    text-decoration: none;
    color: var(--text-color);
    font-size: 0.85rem;
    font-weight: 500;
    opacity: 0.6;
    transition: opacity 0.2s;
}

.top-right-nav a:hover {
    opacity: 1;
}

.highlight-link {
    color: var(--primary-color) !important;
    opacity: 0.9 !important;
}

.btn-toggle-theme {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    width: 38px;
    height: 38px;
    cursor: pointer;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s;
}

.btn-toggle-theme:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.ad-placeholder {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 0.75rem;
    text-align: center;
    margin: var(--spacing-md) 0;
    border-radius: 12px;
    font-size: 0.8rem;
    color: #64748b;
    opacity: 0.8;
}

.controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: var(--spacing-md);
}

@media (max-width: 480px) {
    .controls {
        grid-template-columns: 1fr;
    }
}

.btn {
    padding: 12px 20px;
    border: none;
    border-radius: 14px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-sm);
}

.btn:hover {
    transform: translateY(-2px);
    filter: brightness(1.05);
    box-shadow: var(--shadow-md);
}

.btn:active {
    transform: translateY(0);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-generate {
    background-color: var(--card-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-premium {
    background: linear-gradient(135deg, var(--primary-color), #4f46e5);
    color: white;
}

.btn-fortune {
    background: linear-gradient(135deg, var(--secondary-color), #db2777);
    color: white;
}

.lotto-display {
    min-height: 180px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: var(--card-bg);
    border-radius: 24px;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    margin-bottom: var(--spacing-lg);
}

.ball-container {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 16px;
}

.ball {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.1rem;
    color: #fff;
    box-shadow: inset -2px -2px 4px rgba(0,0,0,0.1), 0 4px 6px -1px rgba(0,0,0,0.1);
    animation: slideUp 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

@keyframes slideUp {
    0% { transform: translateY(20px); opacity: 0; }
    100% { transform: translateY(0); opacity: 1; }
}

.sub-message {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-color);
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color);
    border-left-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 12px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

section {
    margin-top: var(--spacing-lg);
}

h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: 8px;
}

h3::before {
    content: '';
    display: block;
    width: 4px;
    height: 18px;
    background: var(--primary-color);
    border-radius: 2px;
}

.section-desc {
    font-size: 0.9rem;
    opacity: 0.7;
    margin-bottom: var(--spacing-md);
}

.how-it-works-section p {
    font-size: 0.9rem;
    line-height: 1.7;
    opacity: 0.8;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 12px;
}

.feature-item {
    background-color: var(--card-bg);
    padding: 16px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    text-align: center;
    transition: transform 0.2s;
}

.feature-item:hover {
    transform: translateY(-4px);
}

.feature-item h4 {
    font-size: 0.95rem;
    margin: 0 0 4px 0;
}

.feature-item p {
    font-size: 0.8rem;
    opacity: 0.6;
    margin: 0;
}

.contact-form-section {
    background-color: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: 20px;
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 12px;
}

.form-group label {
    display: block;
    margin-bottom: 4px;
    font-size: 0.85rem;
    font-weight: 600;
    opacity: 0.8;
}

.form-group input, .form-group textarea, .form-group select {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 0.9rem;
    box-sizing: border-box;
    transition: border-color 0.2s;
}

.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.btn-submit {
    background-color: var(--text-color);
    color: var(--bg-color);
    width: 100%;
    margin-top: 8px;
}

.comment-section h2 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
}

footer {
    text-align: center;
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md) 0;
    border-top: 1px solid var(--border-color);
    font-size: 0.8rem;
    color: #64748b;
}

.footer-nav {
    margin: 8px 0;
}

.footer-nav a {
    color: inherit;
    text-decoration: none;
    margin: 0 8px;
    transition: color 0.2s;
}

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

.disclaimer {
    opacity: 0.6;
    font-size: 0.75rem;
}

/* Fortune Page Specifics */
.fortune-container {
    max-width: 600px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

@media (max-width: 480px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

.analysis-result {
    text-align: left;
    background-color: var(--bg-color);
    padding: 16px;
    border-radius: 16px;
    margin-top: 16px;
    border: 1px solid var(--border-color);
}

.analysis-result h4 {
    margin-top: 0;
    font-size: 1rem;
    color: var(--primary-color);
}

#fortune-text {
    font-size: 0.85rem;
    line-height: 1.6;
}

/* Content Pages */
.content-page h2 {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.content-page p {
    font-size: 0.95rem;
    opacity: 0.8;
}

.info-section h3 {
    margin-top: 24px;
}

@media (max-width: 600px) {
    .container {
        padding: var(--spacing-md);
    }
    h1 {
        font-size: 1.5rem;
    }
}