/* Color System */
:root {
    --carbon-black: #212529;
    --paper-white: #FFFFFF;
    --rock-gray: #6C757D;
    --cobalt-blue: #0A66C2;
    --light-divider: #dee2e6;
}

/* Base Styles */
body {
    background-color: var(--paper-white);
    color: var(--carbon-black);
    font-family: 'Noto Sans', sans-serif;
    font-size: 1.1rem;
    line-height: 1.8;
}

/* Typography */
h1 {
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    font-size: 2.5rem;
    margin: 3rem 0;
    line-height: 1.2;
}

h2 {
    font-family: 'Roboto', sans-serif;
    font-weight: 500;
    font-size: 1.75rem;
    margin: 3rem 0 1.5rem;
}

h3 {
    font-family: 'Roboto', sans-serif;
    font-weight: 500;
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
}

p {
    margin-bottom: 1.5rem;
}

a {
    color: var(--cobalt-blue);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--carbon-black);
    text-decoration: underline;
}

/* Layout */
.container-xl {
    max-width: 1140px;
}

.content-container {
    max-width: 680px;
    margin: 0 auto;
}

.breathing-space {
    padding: 3rem 0;
}

/* Header */
.site-header {
    background-color: var(--paper-white);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.site-title {
    color: var(--carbon-black);
    letter-spacing: -0.5px;
}

.custom-logo {
    max-height: 60px;
    width: auto;
}

.custom-logo img {
    height: 60px;
    width: auto;
    max-width: 200px;
}

/* Navigation */
.nav {
    list-style: none;
    display: flex;
    margin: 0;
    padding: 0;
}

.nav-item {
    margin: 0;
}

.nav-link {
    font-family: 'Noto Sans', sans-serif;
    font-weight: 500;
    letter-spacing: 0.5px;
    color: var(--carbon-black);
    position: relative;
    padding: 0.5rem 1rem;
    display: block;
    transition: all 0.3s ease;
}

.nav-link:hover {
    color: var(--cobalt-blue);
    text-decoration: none;
}

.primary-navigation .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 1rem;
    right: 1rem;
    height: 2px;
    background-color: var(--cobalt-blue);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.primary-navigation .nav-link:hover::after {
    transform: scaleX(1);
}

/* Mobile Navigation */
.navbar-toggler {
    border: none;
    background: none;
    padding: 0.25rem 0.5rem;
}

.navbar-toggler-icon {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--carbon-black);
    position: relative;
    transition: all 0.3s ease;
}

.navbar-toggler-icon::before,
.navbar-toggler-icon::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background-color: var(--carbon-black);
    left: 0;
    transition: all 0.3s ease;
}

.navbar-toggler-icon::before {
    top: -8px;
}

.navbar-toggler-icon::after {
    bottom: -8px;
}

.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon {
    background-color: transparent;
}

.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon::before {
    transform: rotate(45deg);
    top: 0;
}

.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon::after {
    transform: rotate(-45deg);
    bottom: 0;
}

/* Divider */
.divider-line {
    height: 1px;
    background-color: var(--light-divider);
    margin-top: 1rem;
}

/* Cards */
.card {
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
}

.card-title a {
    color: var(--carbon-black);
}

.card-title a:hover {
    color: var(--cobalt-blue);
    text-decoration: none;
}

/* Images */
.image-container {
    overflow: hidden;
    position: relative;
}

.grayscale {
    filter: grayscale(100%);
    transition: filter 0.3s ease;
}

.grayscale:hover {
    filter: grayscale(0%);
}

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

/* Post Content */
.post-content {
    font-size: 1.1rem;
    line-height: 1.8;
}

.post-content h2 {
    margin-top: 3rem;
    margin-bottom: 1.5rem;
}

.post-content h3 {
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.post-content p {
    margin-bottom: 1.5rem;
}

.post-content img {
    display: block;
    margin: 2rem auto;
}

.post-content a {
    text-decoration: underline;
}

.post-content blockquote {
    border-left: 4px solid var(--cobalt-blue);
    padding-left: 1.5rem;
    margin: 2rem 0;
    font-style: italic;
    color: var(--rock-gray);
}

.post-content ul,
.post-content ol {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

.post-content li {
    margin-bottom: 0.5rem;
}

/* Secondary Text */
.secondary-text {
    font-size: 0.9rem;
    color: var(--rock-gray);
}

.secondary-text a {
    color: var(--rock-gray);
}

.secondary-text a:hover {
    color: var(--carbon-black);
}

/* Article Meta */
.article-meta {
    font-size: 0.875rem;
}

/* Footer */
.site-footer {
    background-color: var(--paper-white);
    padding: 2rem 0;
}

.social-icons .icon-link {
    color: var(--rock-gray);
    transition: color 0.3s ease;
}

.social-icons .icon-link:hover {
    color: var(--carbon-black);
}

/* Pagination */
.pagination {
    margin-top: 3rem;
}

.page-numbers {
    display: inline-block;
    padding: 0.5rem 1rem;
    margin: 0 0.25rem;
    color: var(--carbon-black);
    border: 1px solid var(--light-divider);
    transition: all 0.3s ease;
}

.page-numbers:hover {
    background-color: var(--cobalt-blue);
    color: var(--paper-white);
    border-color: var(--cobalt-blue);
    text-decoration: none;
}

.page-numbers.current {
    background-color: var(--carbon-black);
    color: var(--paper-white);
    border-color: var(--carbon-black);
}

/* Tags */
.post-tags a {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--light-divider);
    color: var(--carbon-black);
    font-size: 0.875rem;
    border-radius: 3px;
    transition: all 0.3s ease;
}

.post-tags a:hover {
    background-color: var(--cobalt-blue);
    color: var(--paper-white);
    text-decoration: none;
}

/* Responsive Design */
@media (max-width: 991px) {
    .breathing-space {
        padding: 2rem 0;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
}

@media (max-width: 767px) {
    body {
        font-size: 1rem;
    }
    
    h1 {
        font-size: 1.75rem;
        margin: 2rem 0;
    }
    
    h2 {
        font-size: 1.25rem;
    }
    
    .content-container {
        padding: 0 1rem;
    }
    
    .post-content {
        font-size: 1rem;
    }
}

@media (max-width: 575px) {
    .grayscale {
        filter: none !important;
    }
    
    .site-title {
        font-size: 1.25rem;
    }
    
    .custom-logo img {
        height: 40px;
    }
    
    .breathing-space {
        padding: 1.5rem 0;
    }
}

/* Accessibility */
.screen-reader-text {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* Print Styles */
@media print {
    .site-header,
    .site-footer,
    .pagination-container,
    .post-tags {
        display: none;
    }
    
    .post-content a[href]:after {
        content: " (" attr(href) ")";
    }
    
    .grayscale {
        filter: none !important;
    }
}