/* 
   Telfor - Enciklopedija Telekomunikacija
   Spartan & Minimalist Technical Design System
*/

@import url('https://fonts.googleapis.com/css2?family=Archivo:ital,wght@0,100..900;1,100..900&family=Bebas+Neue&family=JetBrains+Mono:wght@400;700&display=swap');

:root {
    /* Color Palette - Spartan Premium Light Theme */
    --bg-dark: #f8fafc;
    --bg-surface: #ffffff;
    --bg-card: #ffffff;
    --border-color: #e2e8f0;
    --border-glow: rgba(37, 99, 235, 0.08);
    
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-muted: #64748b;
    
    /* Technical Accents (using primary colors from logo but adapted for light background) */
    --accent-yellow: #ca8a04;
    --accent-blue: #2563eb;
    --accent-red: #dc2626;
    --accent-green: #16a34a;
    
    /* Global Typography */
    --font-heading: 'Bebas Neue', sans-serif;
    --font-body: 'Archivo', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --transition-smooth: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --container-width: 1100px;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a {
    color: var(--accent-blue);
    text-decoration: none;
    transition: var(--transition-smooth);
}

a:hover {
    color: var(--accent-yellow);
    text-decoration: underline;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: normal;
    letter-spacing: 0.05em;
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.1;
}

p {
    margin-bottom: 1.25rem;
    color: var(--text-secondary);
}

ul, ol {
    margin-bottom: 1.25rem;
    margin-left: 1.5rem;
    color: var(--text-secondary);
}

li {
    margin-bottom: 0.5rem;
}

/* Header & Alert Banner */
.alert-banner {
    background: linear-gradient(90deg, #f1f5f9 0%, #e2e8f0 100%);
    border-bottom: 1px solid var(--border-color);
    padding: 10px 20px;
    text-align: center;
    font-size: 0.85rem;
    font-family: var(--font-mono);
    letter-spacing: 0.02em;
    z-index: 1000;
    color: var(--text-primary);
}

.alert-banner a {
    color: var(--accent-blue);
    font-weight: bold;
    text-decoration: underline;
    margin-left: 5px;
}

.alert-banner a:hover {
    color: #000000;
}

/* Decorative Telfor Color Stripe */
.color-stripe {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    height: 4px;
    width: 100%;
}
.stripe-yellow { background-color: var(--accent-yellow); }
.stripe-green { background-color: var(--accent-green); }
.stripe-red { background-color: var(--accent-red); }
.stripe-blue { background-color: var(--accent-blue); }

.site-header {
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 999;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
}

.site-logo-img {
    height: 38px;
    width: 38px;
}

.site-title {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    margin-bottom: 0;
    letter-spacing: 0.02em;
    color: var(--text-primary);
    display: flex;
    align-items: center;
}

.site-title span {
    color: var(--text-muted);
    font-weight: 300;
    margin-left: 6px;
    font-size: 1.3rem;
    border-left: 1px solid var(--border-color);
    padding-left: 10px;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 24px;
}

.nav-link {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
    transition: var(--transition-smooth);
}

.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
    text-decoration: none;
    border-bottom: 2px solid var(--accent-yellow);
}

/* Hero Section */
.hero-section {
    padding: 80px 0 50px 0;
    border-bottom: 1px solid var(--border-color);
    background: radial-gradient(circle at 50% 0%, rgba(37, 99, 235, 0.02) 0%, transparent 80%);
}

.hero-title {
    font-size: 4rem;
    text-align: center;
    margin-bottom: 15px;
    text-transform: uppercase;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    text-align: center;
    max-width: 800px;
    margin: 0 auto 40px auto;
    font-weight: 300;
}

/* Search Box */
.search-box-wrapper {
    max-width: 600px;
    margin: 0 auto 30px auto;
    position: relative;
}

.search-icon {
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 1.1rem;
}

.search-box {
    width: 100%;
    padding: 16px 20px 16px 48px;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: var(--transition-smooth);
}

.search-box:focus {
    outline: none;
    border-color: var(--text-secondary);
    box-shadow: 0 0 0 3px var(--border-glow);
}

/* Category Filter Bar */
.categories-wrapper {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    max-width: 900px;
    margin: 0 auto;
}

.cat-btn {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 16px;
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 4px;
    transition: var(--transition-smooth);
}

.cat-btn:hover {
    color: var(--text-primary);
    border-color: var(--text-muted);
}

.cat-btn.active {
    background-color: var(--text-primary);
    color: var(--bg-surface);
    border-color: var(--text-primary);
    font-weight: 600;
}

/* Articles Section & Grid */
.section {
    padding: 60px 0;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
    margin-top: 20px;
}

.card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: var(--transition-smooth);
    text-decoration: none;
    color: var(--text-primary);
}

a.card {
    text-decoration: none;
}

a.card:hover {
    text-decoration: none;
}

.card:hover {
    border-color: var(--text-secondary);
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05);
}

.card-badge {
    align-self: flex-start;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: 3px 8px;
    border-radius: 2px;
    margin-bottom: 12px;
    font-weight: bold;
    text-transform: uppercase;
}

.badge-mreze-i-protokoli { background-color: rgba(37, 99, 235, 0.08); color: #1d4ed8; border: 1px solid rgba(37, 99, 235, 0.2); }
.badge-bezicne-i-radio { background-color: rgba(202, 138, 4, 0.08); color: #854d0e; border: 1px solid rgba(202, 138, 4, 0.2); }
.badge-elektronika-i-signal { background-color: rgba(220, 38, 38, 0.08); color: #991b1b; border: 1px solid rgba(220, 38, 38, 0.2); }
.badge-it-i-podaci { background-color: rgba(22, 163, 74, 0.08); color: #166534; border: 1px solid rgba(22, 163, 74, 0.2); }
.badge-servisi-i-regulativa { background-color: rgba(147, 51, 234, 0.08); color: #6b21a8; border: 1px solid rgba(147, 51, 234, 0.2); }

.card-title {
    font-size: 1.8rem;
    line-height: 1.15;
    margin-bottom: 10px;
    text-transform: uppercase;
}

.card-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    flex-grow: 1;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.read-more {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    color: var(--text-primary);
    letter-spacing: 0.05em;
}

.card:hover .read-more {
    color: var(--accent-yellow);
    text-decoration: underline;
}

.no-results {
    text-align: center;
    padding: 60px 20px;
    border: 1px dashed var(--border-color);
    border-radius: 4px;
}

.no-results h3 {
    font-size: 2rem;
    margin-bottom: 10px;
}

.no-results p {
    color: var(--text-secondary);
}

/* Article Layout (Wiki Detail Style) */
.article-layout {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 40px;
}

.article-main {
    min-width: 0;
}

.article-header {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 25px;
    margin-bottom: 30px;
}

.article-category {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    text-transform: uppercase;
    color: var(--accent-blue);
    margin-bottom: 10px;
    display: inline-block;
}

.article-title-large {
    font-size: 3.5rem;
    line-height: 1.05;
    margin-bottom: 15px;
    text-transform: uppercase;
}

.article-meta-large {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.article-meta-large span strong {
    color: var(--text-secondary);
}

.summary-box {
    background-color: var(--bg-surface);
    border-left: 4px solid var(--text-secondary);
    padding: 20px;
    border-radius: 0 4px 4px 0;
    margin-bottom: 30px;
}

.summary-box h3 {
    font-size: 1.4rem;
    text-transform: uppercase;
    margin-bottom: 10px;
}

.summary-box ul {
    margin-bottom: 0;
}

.article-content h2 {
    font-size: 2.2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 6px;
    margin-top: 40px;
    margin-bottom: 15px;
    text-transform: uppercase;
}

.article-content h3 {
    font-size: 1.6rem;
    margin-top: 30px;
    margin-bottom: 10px;
    text-transform: uppercase;
}

.article-content blockquote {
    border-left: 3px solid var(--border-color);
    padding: 5px 0 5px 20px;
    margin: 25px 0;
    font-style: italic;
    color: var(--text-secondary);
}

/* Spartan Tables & Responsive Wrapper */
.table-wrapper {
    width: 100%;
    overflow-x: auto;
    margin: 25px 0;
    -webkit-overflow-scrolling: touch;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 0;
    font-family: var(--font-body);
    font-size: 0.9rem;
}

th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: var(--bg-surface);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-top: 1px solid var(--border-color);
}

tr:hover td {
    background-color: rgba(0, 0, 0, 0.015);
}

/* Sidebar Styling */
.article-sidebar {
    position: relative;
    height: auto;
    overflow-y: visible;
    padding-right: 0;
}

.sidebar-widget {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 20px;
    margin-bottom: 24px;
}

.widget-title {
    font-size: 1.4rem;
    margin-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
    text-transform: uppercase;
}

.toc-list, .recent-posts-list {
    list-style: none;
    margin-left: 0;
    font-size: 0.9rem;
}

.toc-list li, .recent-posts-list li {
    margin-bottom: 10px;
}

.toc-list a {
    color: var(--text-secondary);
}

.toc-list a:hover {
    color: var(--text-primary);
}

.recent-posts-list a {
    font-weight: 500;
    color: var(--text-primary);
    display: block;
}

.recent-posts-list a:hover {
    color: var(--accent-blue);
}

.recent-posts-list span {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    display: block;
    margin-top: 2px;
}

/* Footnotes & References */
.footnote-ref {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    vertical-align: super;
    line-height: 0;
    margin-left: 2px;
}

.footnotes-section {
    border-top: 1px solid var(--border-color);
    margin-top: 50px;
    padding-top: 20px;
}

.footnotes-section h3 {
    font-size: 1.4rem;
    text-transform: uppercase;
    margin-bottom: 15px;
}

.footnotes-list {
    margin-left: 1.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.footnotes-list li {
    margin-bottom: 8px;
}

.footnotes-list li:target {
    background-color: rgba(234, 179, 8, 0.08);
    border-radius: 2px;
    padding: 2px 5px;
}

/* FAQ Section Accordion */
.faq-section-title {
    font-size: 2.2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 6px;
    margin-top: 50px;
    margin-bottom: 20px;
    text-transform: uppercase;
}

.faq-accordion {
    margin-bottom: 40px;
}

.faq-item {
    border: 1px solid var(--border-color);
    border-radius: 4px;
    margin-bottom: 12px;
    background-color: var(--bg-surface);
    overflow: hidden;
}

.faq-question {
    padding: 18px 20px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
    transition: var(--transition-smooth);
}

.faq-question:hover {
    background-color: rgba(0, 0, 0, 0.015);
}

.faq-question-text {
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--text-primary);
}

.faq-icon {
    font-size: 0.8rem;
    transition: var(--transition-smooth);
    color: var(--text-muted);
}

.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s cubic-bezier(0, 1, 0, 1);
    border-top: 0 solid var(--border-color);
}

.faq-item.active .faq-answer {
    padding: 18px 20px;
    max-height: 1000px;
    border-top-width: 1px;
    transition: max-height 0.25s ease-in;
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
}

/* Read Next Section */
.read-next-section {
    border-top: 1px solid var(--border-color);
    margin-top: 50px;
    padding-top: 30px;
}

.read-next-title {
    font-size: 1.8rem;
    margin-bottom: 20px;
    text-transform: uppercase;
}

.read-next-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.read-next-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition-smooth);
}

.read-next-card:hover {
    border-color: var(--text-secondary);
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05);
    text-decoration: none;
}

.read-next-badge {
    align-self: flex-start;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--accent-blue);
    text-transform: uppercase;
    font-weight: bold;
    margin-bottom: 8px;
}

.read-next-card h4.read-next-title {
    font-size: 1.5rem;
    line-height: 1.2;
    margin-bottom: 8px;
    text-transform: uppercase;
    color: var(--text-primary);
}

.read-next-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0;
    line-height: 1.4;
}

/* Glossary Page (Rečnik) */
.recnik-container {
    padding: 60px 0;
}

.alphabet-bar {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 15px;
    border-radius: 4px;
    margin-bottom: 40px;
}

.letter-btn {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    font-weight: bold;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border-radius: 4px;
    transition: var(--transition-smooth);
}

.letter-btn:hover {
    color: var(--text-primary);
    border-color: var(--text-muted);
}

.letter-btn.active {
    background-color: var(--accent-yellow);
    border-color: var(--accent-yellow);
    color: var(--bg-surface);
}

.letter-btn.disabled {
    opacity: 0.15;
    pointer-events: none;
}

.recnik-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.recnik-group {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 30px;
    margin-bottom: 20px;
}

.recnik-letter-title {
    font-size: 3rem;
    color: var(--accent-yellow);
    border-bottom: 2px solid var(--accent-yellow);
    display: inline-block;
    padding-right: 15px;
    margin-bottom: 20px;
}

.term-item {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 20px;
    margin-bottom: 16px;
    scroll-margin-top: 100px;
}

.term-title {
    font-family: var(--font-mono);
    font-size: 1.15rem;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.term-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Footer Section */
.site-footer {
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    padding: 50px 0 30px 0;
    margin-top: 80px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.2fr;
    gap: 30px;
    margin-bottom: 40px;
}

.footer-about h3 {
    font-size: 1.6rem;
    text-transform: uppercase;
}

.footer-about p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    max-width: 450px;
}

.footer-links h4 {
    font-size: 1.2rem;
    text-transform: uppercase;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.footer-links ul {
    list-style: none;
    margin-left: 0;
    font-size: 0.9rem;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: var(--text-secondary);
}

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

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.footer-bottom a {
    color: var(--text-muted);
    text-decoration: underline;
}

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

/* Responsive adjustments */
@media (max-width: 900px) {
    .article-layout {
        grid-template-columns: 1fr;
    }
    
    .article-sidebar {
        position: static;
        height: auto;
        margin-top: 40px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 600px) {
    .site-header {
        padding: 10px 0;
    }

    .hero-title {
        font-size: 2.8rem;
    }
    
    .article-title-large {
        font-size: 2.4rem;
    }
    
    .header-inner {
        flex-direction: column;
        gap: 10px;
        text-align: center;
        align-items: center;
    }

    .site-title {
        font-size: 1.6rem;
    }

    .site-title span {
        font-size: 0.95rem;
        padding-left: 8px;
        margin-left: 4px;
    }
    
    .site-nav {
        width: 100%;
        display: flex;
        justify-content: flex-start;
        overflow-x: auto;
        white-space: nowrap;
        gap: 18px;
        padding: 5px 10px;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none; /* Firefox */
    }

    .site-nav::-webkit-scrollbar {
        display: none; /* Safari/Chrome */
    }

    .nav-link {
        flex-shrink: 0;
        font-size: 1.1rem;
        padding-bottom: 3px;
    }
    
    .read-next-grid {
        grid-template-columns: 1fr;
    }
}