/* ============================================================================
   MAIN STYLES - SymmetriCat
   Global styles, layout, typography, and utilities
   ============================================================================ */

/* CSS Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette - Clean & Modern */
    --color-primary: #4A90E2;        /* Blue for CTAs */
    --color-primary-dark: #357ABD;
    --color-secondary: #7B68EE;      /* Purple accent */
    --color-success: #27AE60;        /* Green for easy */
    --color-warning: #F39C12;        /* Orange for medium */
    --color-danger: #E74C3C;         /* Red for hard */
    --color-info: #3498DB;
    
    /* Neutrals */
    --color-bg: #FFFFFF;
    --color-bg-alt: #F8F9FA;
    --color-bg-dark: #2C3E50;
    --color-text: #2C3E50;
    --color-text-light: #7F8C8D;
    --color-text-white: #FFFFFF;
    --color-border: #E1E8ED;
    --color-shadow: rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-heading: 'Georgia', 'Times New Roman', serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition: all 0.2s ease;
}

/* Typography */
body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

/* Layout */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header & Navigation */
.site-header {
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-sm) var(--spacing-lg);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 4px var(--color-shadow);
}

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

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

.logo a {
    color: inherit;
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--color-text);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    background-color: var(--color-bg-alt);
    color: var(--color-primary);
    text-decoration: none;
}

/* Auth Section */
.auth-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.user-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.user-menu.hidden {
    display: none;
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    object-fit: cover;
}

.user-name {
    font-weight: 500;
    color: var(--color-text);
}

/* Hero Section */
.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    padding: var(--spacing-2xl) 0;
}

.hero-content {
    text-align: left;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

.hero-note {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-top: var(--spacing-sm);
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.image-placeholder {
    width: 100%;
    max-width: 400px;
    aspect-ratio: 1;
    background-color: var(--color-bg-alt);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--color-text-light);
    text-align: center;
    padding: var(--spacing-lg);
}

/* Features Grid */
.features {
    padding: var(--spacing-2xl) 0;
    background-color: var(--color-bg-alt);
    margin: var(--spacing-xl) calc(-1 * var(--spacing-lg));
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    font-size: 2.5rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.feature-card {
    background-color: var(--color-bg);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: 0 2px 8px var(--color-shadow);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 16px var(--color-shadow);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

/* Difficulty Section */
.difficulty-section {
    padding: var(--spacing-2xl) 0;
}

.difficulty-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    max-width: 1000px;
    margin: 0 auto;
}

.difficulty-card {
    background-color: var(--color-bg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    transition: var(--transition);
}

.difficulty-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
}

.difficulty-card.easy { border-color: var(--color-success); }
.difficulty-card.medium { border-color: var(--color-warning); }
.difficulty-card.hard { border-color: var(--color-danger); }
.difficulty-card.extra-hard { border-color: var(--color-secondary); }

.difficulty-size {
    font-weight: bold;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
}

/* How to Play */
.how-to-play {
    padding: var(--spacing-2xl) 0;
    text-align: center;
}

.rules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: var(--spacing-xl) auto;
}

.rule-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.rule-number {
    width: 48px;
    height: 48px;
    background-color: var(--color-primary);
    color: var(--color-text-white);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
}

/* Ad Zones */
.ad-zone {
    margin: var(--spacing-lg) auto;
    text-align: center;
}

.ad-placeholder {
    background-color: var(--color-bg-alt);
    border: 1px dashed var(--color-border);
    padding: var(--spacing-lg);
    color: var(--color-text-light);
    font-size: 0.875rem;
    border-radius: var(--radius-md);
}

.ad-horizontal .ad-placeholder {
    max-width: 728px;
    height: 90px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.ad-sidebar {
    position: sticky;
    top: 100px;
    width: 300px;
    margin-left: var(--spacing-lg);
}

.ad-sidebar .ad-placeholder {
    width: 300px;
    height: 250px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* Footer */
.site-footer {
    background-color: var(--color-bg-dark);
    color: var(--color-text-white);
    padding: var(--spacing-xl) var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
    color: var(--color-text-white);
    margin-bottom: var(--spacing-sm);
}

.footer-section ul {
    list-style: none;
}

.footer-section a {
    color: var(--color-text-white);
    opacity: 0.8;
    transition: var(--transition);
}

.footer-section a:hover {
    opacity: 1;
    text-decoration: underline;
}

.footer-copyright {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.7;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content {
        text-align: center;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .nav-menu {
        gap: var(--spacing-sm);
    }
    
    .ad-sidebar {
        display: none;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.text-muted {
    color: var(--color-text-light);
}