/* ==========================================================================
   Cyber Regulation - Main Stylesheet
   Clean, bright, minimalistic cybersecurity design
   ========================================================================== */

/* -- Reset and base -- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --color-primary: #0f7b8a;
    --color-primary-dark: #0a5e6a;
    --color-primary-light: #e6f4f6;
    --color-accent: #1a9cb0;
    --color-bg: #ffffff;
    --color-bg-light: #f7f9fa;
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-border: #e2e8f0;
    --color-card-bg: #ffffff;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --container-max: 1200px;
    --container-narrow: 800px;
    --radius: 8px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.1);
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

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

/* -- Container -- */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.container-narrow {
    max-width: var(--container-narrow);
}

/* -- Header -- */
.site-header {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.site-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.02em;
}

.site-logo:hover {
    color: var(--color-primary-dark);
}

.site-nav ul {
    list-style: none;
    display: flex;
    gap: 1.5rem;
}

.site-nav a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
    transition: color 0.2s ease;
}

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

.lang-switcher {
    display: flex;
    gap: 0.75rem;
}

.lang-switcher a {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-light);
    padding: 0.25rem 0.5rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    transition: all 0.2s ease;
}

.lang-switcher a:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
    background: var(--color-primary-light);
}

/* -- Hero Section -- */
.hero {
    background: linear-gradient(135deg, var(--color-primary-light) 0%, #f0f9fb 50%, var(--color-bg) 100%);
    padding: 5rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 2.75rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 1rem;
    letter-spacing: -0.03em;
    line-height: 1.2;
}

.hero p {
    font-size: 1.2rem;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* -- Articles Section -- */
.articles-section {
    padding: 4rem 0;
    background: var(--color-bg-light);
}

.articles-section h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--color-text);
}

.no-articles {
    color: var(--color-text-light);
    font-size: 1.1rem;
    text-align: center;
    padding: 3rem 0;
}

/* -- Article Grid -- */
.article-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

@media (max-width: 900px) {
    .article-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .article-grid {
        grid-template-columns: 1fr;
    }
}

/* -- Article Card -- */
.article-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    transition: box-shadow 0.2s ease, transform 0.2s ease;
    overflow: hidden;
}

.article-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.article-card-body {
    padding: 1.5rem;
    flex: 1;
}

.article-category {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary);
    background: var(--color-primary-light);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    margin-bottom: 0.75rem;
}

.article-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 0.5rem;
}

.article-card h3 a {
    color: var(--color-text);
}

.article-card h3 a:hover {
    color: var(--color-primary);
}

.article-excerpt {
    font-size: 0.9rem;
    color: var(--color-text-light);
    line-height: 1.5;
    margin-bottom: 0.75rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.8rem;
    color: var(--color-text-light);
}

.reading-time::before {
    content: "\2022";
    margin-right: 0.5rem;
}

.read-more {
    display: block;
    padding: 0.75rem 1.5rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
    border-top: 1px solid var(--color-border);
    transition: background 0.2s ease;
}

.read-more:hover {
    background: var(--color-primary-light);
}

/* -- Single Article -- */
.article-single {
    padding: 3rem 0;
}

.article-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-border);
}

.article-header h1 {
    font-size: 2.25rem;
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

.article-featured-image {
    margin-bottom: 2rem;
    border-radius: var(--radius);
    overflow: hidden;
}

.article-featured-image img {
    width: 100%;
}

/* -- Prose (rendered markdown) -- */
.prose {
    font-size: 1.05rem;
    line-height: 1.8;
}

.prose h1, .prose h2, .prose h3, .prose h4, .prose h5, .prose h6 {
    color: var(--color-text);
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    line-height: 1.3;
    font-weight: 600;
}

.prose h2 { font-size: 1.5rem; }
.prose h3 { font-size: 1.25rem; }
.prose h4 { font-size: 1.1rem; }

.prose p {
    margin-bottom: 1.25rem;
}

.prose ul, .prose ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
}

.prose li {
    margin-bottom: 0.4rem;
}

.prose blockquote {
    border-left: 4px solid var(--color-primary);
    background: var(--color-primary-light);
    padding: 1rem 1.5rem;
    margin: 1.5rem 0;
    border-radius: 0 var(--radius) var(--radius) 0;
    color: var(--color-text);
    font-style: italic;
}

.prose code {
    background: var(--color-bg-light);
    border: 1px solid var(--color-border);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

.prose pre {
    background: #1e293b;
    color: #e2e8f0;
    padding: 1.25rem;
    border-radius: var(--radius);
    overflow-x: auto;
    margin: 1.5rem 0;
    line-height: 1.5;
}

.prose pre code {
    background: none;
    border: none;
    padding: 0;
    color: inherit;
    font-size: 0.875rem;
}

.prose table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 0.95rem;
}

.prose th, .prose td {
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    text-align: left;
}

.prose th {
    background: var(--color-bg-light);
    font-weight: 600;
}

.prose tr:nth-child(even) {
    background: var(--color-bg-light);
}

.prose a {
    color: var(--color-primary);
    text-decoration: underline;
    text-decoration-color: rgba(15, 123, 138, 0.3);
    text-underline-offset: 2px;
}

.prose a:hover {
    text-decoration-color: var(--color-primary);
}

.prose img {
    border-radius: var(--radius);
    margin: 1.5rem 0;
}

.prose hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 2rem 0;
}

/* -- Article Footer -- */
.article-footer {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
}

.back-link {
    font-weight: 500;
    color: var(--color-primary);
}

/* -- Site Footer -- */
.site-footer {
    background: #1e293b;
    color: #cbd5e1;
    padding: 3rem 0 1.5rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

@media (max-width: 700px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

.footer-section h3 {
    color: #f1f5f9;
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.footer-section p {
    font-size: 0.9rem;
    line-height: 1.6;
}

.footer-section a {
    color: var(--color-accent);
}

.footer-section a:hover {
    color: #ffffff;
}

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

.footer-section ul li {
    margin-bottom: 0.4rem;
}

.footer-section ul a {
    font-size: 0.9rem;
    color: #94a3b8;
    transition: color 0.2s ease;
}

.footer-section ul a:hover {
    color: #ffffff;
}

.footer-bottom {
    border-top: 1px solid #334155;
    padding-top: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: #64748b;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.footer-bottom a {
    color: #94a3b8;
}

.footer-bottom a:hover {
    color: #ffffff;
}

/* -- Responsive adjustments -- */
@media (max-width: 600px) {
    .hero {
        padding: 3rem 0;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .article-header h1 {
        font-size: 1.75rem;
    }

    .site-header .container {
        flex-wrap: wrap;
        height: auto;
        padding-top: 0.75rem;
        padding-bottom: 0.75rem;
        gap: 0.5rem;
    }

    .site-nav ul {
        gap: 1rem;
    }
}

/* Article card images */
.article-card-image {
    display: block;
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: var(--color-bg-alt, #f0f4f8);
}

.article-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.article-card:hover .article-card-image img {
    transform: scale(1.05);
}