/* ========================================
   CSS RESET & ROOT VARIABLES
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 60-30-10 Color Rule */
    --color-base: #FFFFFF;              /* 60% - Background */
    --color-base-light: #F8F8F8;        /* 60% - Alt Background */
    --color-contrast: #333333;          /* 30% - Primary Text */
    --color-contrast-light: #666666;    /* 30% - Secondary Text */
    --color-contrast-lighter: #999999;  /* 30% - Tertiary Text */
    --color-accent-blue: #0077B6;       /* 10% - Primary CTA */
    --color-accent-blue-hover: #005a8c;
    --color-accent-green: #588157;      /* 10% - Secondary Accent */
    --color-accent-orange: #F77F00;     /* 10% - Highlight */
    --color-accent-primary: #4A90E2;    /* Alternative Primary */
    --color-accent-secondary: #FF6B4A;  /* Alternative Secondary */

    /* Typography - Magazine Quality */
    --font-heading: Georgia, serif;
    --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;

    /* 8px Grid System */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 40px;
    --spacing-xl: 60px;
    
    /* Typography Scale */
    --font-size-h1: 48px;
    --font-size-h2: 36px;
    --font-size-h3: 24px;
    --font-size-h4: 20px;
    --font-size-body: 16px;
    --font-size-small: 14px;
    
    /* Line Heights - Magazine Standard */
    --line-height-heading: 1.2;
    --line-height-body: 1.8;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

/* ========================================
   BASE STYLES
   ======================================== */
body {
    font-family: var(--font-body);
    font-size: var(--font-size-body);
    line-height: var(--line-height-body);
    color: var(--color-contrast);
    background: var(--color-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: var(--line-height-heading);
    color: var(--color-contrast);
    letter-spacing: -0.02em;
}

h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }
h4 { font-size: var(--font-size-h4); }

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

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ========================================
   HEADER & NAVIGATION
   ======================================== */
.site-header {
    background: var(--color-base);
    border-bottom: 1px solid #E9ECEF;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.03);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    min-height: 100px;
}

.site-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    transition: opacity var(--transition-normal);
}

.site-logo:hover {
    opacity: 0.8;
}

.site-logo img {
    height: 80px;
    width: auto;
}

.main-nav {
    display: flex;
    justify-content: flex-end;
}

.main-nav ul {
    list-style: none;
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.main-nav a {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 15px;
    color: var(--color-contrast);
    padding: 8px 16px;
    border-radius: 6px;
    text-decoration: none;
    transition: all var(--transition-normal);
    white-space: nowrap;
}

.main-nav a:hover,
.main-nav a.active {
    background: var(--color-base-light);
    color: var(--color-accent-blue);
}

.dropdown {
    position: relative;
}

.dropdown-toggle {
    cursor: pointer;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
    min-width: 280px;
    padding: 12px 0;
    margin-top: 8px;
    z-index: 1001;
}

@media (min-width: 769px) {
    .dropdown:hover .dropdown-menu,
    .main-nav .dropdown.active .dropdown-menu {
        display: block;
    }
}

.dropdown.active .dropdown-menu {
    display: block;
}

.dropdown-menu a {
    display: block;
    padding: 12px 20px;
    color: var(--color-contrast);
    text-decoration: none;
    transition: all var(--transition-normal);
    border-radius: 0;
}

.dropdown-menu a:hover {
    background: var(--color-base-light);
    color: var(--color-accent-blue);
}

.dropdown-divider {
    height: 1px;
    background: #E9ECEF;
    margin: 8px 0;
}

.arrow {
    font-size: 10px;
    margin-left: 4px;
}

/* ========================================
   FOOTER
   ======================================== */
.site-footer {
    background: var(--color-contrast);
    color: rgba(255,255,255,0.8);
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto var(--spacing-lg);
    padding: 0 var(--spacing-lg);
}

.footer-section h3 {
    color: white;
    font-size: 18px;
    margin-bottom: var(--spacing-sm);
}

.footer-section p {
    color: rgba(255,255,255,0.7);
    font-size: 15px;
    line-height: 1.6;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: rgba(255,255,255,0.8);
    transition: color var(--transition-fast);
    font-size: 15px;
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.6);
    font-size: 14px;
    max-width: 1400px;
    margin: 0 auto;
    padding-left: var(--spacing-lg);
    padding-right: var(--spacing-lg);
}

/* ========================================
   CONTAINER & SECTIONS
   ======================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-xl) 0;
}

.section-header {
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-size: var(--font-size-h2);
    margin-bottom: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: 12px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--color-contrast-light);
    font-weight: 400;
}

.section-header-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: var(--spacing-lg);
}

.view-all-link {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 15px;
    color: var(--color-accent-blue);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: gap var(--transition-fast);
}

.view-all-link:hover {
    gap: 10px;
    color: var(--color-accent-blue-hover);
}

/* Category Section Styling */
.category-section {
    padding: var(--spacing-xl) 0;
}

.category-section:nth-child(even) {
    background: var(--color-base-light);
}

.category-section .container {
    max-width: 1200px;
}

/* Article Cards Grid */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.article-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 12px;
    overflow: hidden;
    transition: all var(--transition-normal);
    border: 1px solid rgba(233, 236, 239, 0.8);
}

.article-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px rgba(0,0,0,0.1);
    border-color: transparent;
}

/* ========================================
   MOBILE MENU SYSTEM
   ======================================== */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 30px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.mobile-menu-toggle span {
    width: 100%;
    height: 3px;
    background: #111111;
    border-radius: 2px;
    transition: all 0.3s ease;
    transform-origin: center;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

.mobile-nav-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
}

.mobile-nav-overlay.active {
    display: block;
}

.mobile-nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 300px;
    height: 100vh;
    background: var(--color-base);
    box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: right 0.3s ease;
    overflow-y: auto;
    padding: 80px 0 40px 0;
}

.mobile-nav-menu.active {
    right: 0;
}

.mobile-nav-menu > ul > li {
    border-bottom: 1px solid #f0f0f0;
}

.mobile-nav-menu > ul > li > a {
    display: block;
    padding: 18px 30px;
    color: var(--color-contrast);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.mobile-nav-menu > ul > li > a:hover,
.mobile-nav-menu > ul > li > a.active {
    background: var(--color-base-light);
    color: var(--color-accent-primary);
}

.mobile-nav-menu .dropdown > a {
    color: var(--color-contrast);
}

.mobile-nav-menu .dropdown.active > a {
    color: var(--color-accent-primary);
}

.mobile-nav-menu .dropdown-menu {
    background: var(--color-base-light);
    padding: 0;
    margin: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.mobile-nav-menu .dropdown.active .dropdown-menu {
    max-height: 400px;
}

.mobile-nav-menu .dropdown-menu a {
    display: block;
    padding: 12px 50px;
    color: var(--color-contrast-light);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.mobile-nav-menu .dropdown-menu a:hover,
.mobile-nav-menu .dropdown-menu a:active {
    background: #e9ecef;
    color: var(--color-accent-primary);
}

.mobile-nav-menu .dropdown-toggle::after {
    content: "▼";
    float: right;
    font-size: 12px;
    transition: transform 0.3s ease;
}

.mobile-nav-menu .dropdown.active .dropdown-toggle::after {
    transform: rotate(180deg);
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 1024px) {
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-h1: 36px;
        --font-size-h2: 28px;
        --spacing-lg: 40px;
        --spacing-xl: 60px;
    }

    body {
        overflow-x: hidden;
    }

    .container {
        padding: 0 20px;
        max-width: 100%;
    }

    .header-container {
        padding: 15px 20px;
        flex-wrap: nowrap;
    }

    .site-logo img {
        height: 60px;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .main-nav {
        display: none;
    }

    .articles-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .section-header-row {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .section-title {
        font-size: 28px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .footer-section h3 {
        font-size: 18px;
    }

    .footer-section ul li a {
        font-size: 14px;
    }
}