/* ===================================
   CYBEROTECNICA.COM — Tech Community CSS
   Modern 2000s tech revival: deep navy,
   electric cyan/green accents, bold type.
   Completely separate from FOR:LEDGER / corporate sites.
   =================================== */

:root {
    --cb-navy: #0a0e1a;
    --cb-navy-mid: #111827;
    --cb-navy-light: #1a2236;
    --cb-cyan: #00e5ff;
    --cb-green: #39ff14;
    --cb-cyan-dim: rgba(0, 229, 255, 0.15);
    --cb-green-dim: rgba(57, 255, 20, 0.08);
    --cb-white: #f0f4f8;
    --cb-grey: #8892a4;
    --cb-grey-light: #b0bac8;
    --cb-border: rgba(0, 229, 255, 0.12);
    --cb-glow: 0 0 20px rgba(0, 229, 255, 0.25);
}

/* --- Site wrapper --- */
.cb-site {
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    color: var(--cb-white);
    background: var(--cb-navy);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
}

.cb-site *, .cb-site *::before, .cb-site *::after {
    box-sizing: border-box;
}

.cb-site h1, .cb-site h2, .cb-site h3, .cb-site h4 {
    font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
    color: var(--cb-white);
    line-height: 1.1;
    margin: 0;
    font-weight: 800;
    letter-spacing: -0.03em;
}

.cb-site p {
    color: var(--cb-grey-light);
    line-height: 1.7;
    margin: 0;
}

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

/* --- Container --- */
.cb-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

@media (min-width: 1024px) {
    .cb-container { padding: 0 2.5rem; }
}

/* --- Header --- */
.cb-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 50;
    background: rgba(10, 14, 26, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--cb-border);
    padding: 0.875rem 0;
}

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

.cb-logo {
    display: flex;
    align-items: center;
}

.cb-logo-img {
    height: 28px;
    width: auto;
}

.cb-nav {
    display: flex;
    gap: 2rem;
    align-items: center;
}

@media (max-width: 768px) {
    .cb-nav { display: none; }
}

.cb-nav a {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--cb-grey);
    transition: color 0.2s;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.cb-nav a:hover {
    color: var(--cb-cyan);
}

/* --- Mobile menu toggle --- */
.cb-mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--cb-cyan);
    font-size: 1.5rem;
    cursor: pointer;
}

@media (max-width: 768px) {
    .cb-mobile-toggle { display: block; }
}

.cb-mobile-nav {
    display: none;
    flex-direction: column;
    gap: 1rem;
    padding: 1rem 1.5rem;
    background: var(--cb-navy-mid);
    border-bottom: 1px solid var(--cb-border);
}

.cb-mobile-nav.cb-open {
    display: flex;
}

.cb-mobile-nav a {
    font-size: 1rem;
    font-weight: 600;
    color: var(--cb-grey-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.cb-mobile-nav a:hover {
    color: var(--cb-cyan);
}

/* --- Sections --- */
.cb-section {
    padding: 4rem 0;
}

.cb-section-alt {
    background: var(--cb-navy-mid);
}

.cb-section-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.cb-section-title::before {
    content: '';
    width: 4px;
    height: 1.5em;
    background: linear-gradient(180deg, var(--cb-cyan), var(--cb-green));
    border-radius: 2px;
    flex-shrink: 0;
}

/* --- Article cards --- */
.cb-card-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

@media (max-width: 768px) {
    .cb-card-grid {
        grid-template-columns: 1fr;
    }
}

.cb-card {
    background: var(--cb-navy-light);
    border: 1px solid var(--cb-border);
    border-radius: 0.75rem;
    overflow: hidden;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.cb-card:hover {
    border-color: var(--cb-cyan);
    box-shadow: var(--cb-glow);
    transform: translateY(-3px);
}

.cb-card-img {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    background: var(--cb-navy-mid);
}

.cb-card-body {
    padding: 1.25rem 1.5rem 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.cb-card-section-tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--cb-cyan);
    background: var(--cb-cyan-dim);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    margin-bottom: 0.75rem;
    width: fit-content;
}

.cb-card-title {
    font-size: 1.1rem;
    font-weight: 800;
    line-height: 1.3;
    color: var(--cb-white);
    margin-bottom: 0.5rem;
}

.cb-card-abstract {
    font-size: 0.9rem;
    color: var(--cb-grey);
    line-height: 1.6;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.cb-card-readmore {
    margin-top: 1rem;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--cb-cyan);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: color 0.2s;
}

.cb-card:hover .cb-card-readmore {
    color: var(--cb-green);
}

/* --- Hero banner on home --- */
.cb-hero {
    padding-top: 6rem;
    padding-bottom: 3rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cb-hero::before {
    content: '';
    position: absolute;
    top: -20%;
    left: 50%;
    transform: translateX(-50%);
    width: 60vw;
    height: 60vw;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 229, 255, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.cb-hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: -0.04em;
    line-height: 1;
    display: flex;
    justify-content: center;
}

.cb-hero-logo {
    max-width: min(80vw, 500px);
    height: auto;
}

.cb-gradient-text {
    background: linear-gradient(135deg, var(--cb-cyan), var(--cb-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cb-hero-subtitle {
    margin-top: 1rem;
    font-size: 1.1rem;
    color: var(--cb-grey);
    max-width: 40rem;
    margin-left: auto;
    margin-right: auto;
    text-align: center !important;
}

/* --- Article page --- */
.cb-article {
    padding-top: 6rem;
    padding-bottom: 4rem;
}

.cb-article-header {
    margin-bottom: 2rem;
}

.cb-article-meta {
    display: flex;
    gap: 1rem;
    align-items: center;
    font-size: 0.85rem;
    color: var(--cb-grey);
    margin-bottom: 1rem;
}

.cb-article-title {
    font-size: clamp(1.75rem, 4vw, 3rem);
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: -0.03em;
}

.cb-article-hero-img {
    width: 100%;
    max-height: 480px;
    object-fit: cover;
    border-radius: 0.75rem;
    border: 1px solid var(--cb-border);
    margin-bottom: 2rem;
}

.cb-article-body {
    font-size: 1.05rem;
    line-height: 1.85;
    color: var(--cb-grey-light);
    max-width: 48rem;
}

.cb-article-body h2 {
    font-size: 1.5rem;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

.cb-article-body h3 {
    font-size: 1.2rem;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.cb-article-body p {
    margin-bottom: 1.25rem;
}

.cb-article-body a {
    color: var(--cb-cyan);
    text-decoration: underline;
    text-decoration-color: rgba(0, 229, 255, 0.3);
    text-underline-offset: 2px;
    transition: text-decoration-color 0.2s;
}

.cb-article-body a:hover {
    text-decoration-color: var(--cb-cyan);
}

.cb-article-body blockquote {
    border-left: 3px solid var(--cb-cyan);
    padding-left: 1.25rem;
    margin: 1.5rem 0;
    color: var(--cb-grey);
    font-style: italic;
}

.cb-article-body img {
    max-width: 100%;
    border-radius: 0.5rem;
    margin: 1.5rem 0;
}

.cb-article-body code {
    background: var(--cb-navy-light);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
}

.cb-article-body pre {
    background: var(--cb-navy-light);
    border: 1px solid var(--cb-border);
    border-radius: 0.5rem;
    padding: 1rem 1.25rem;
    overflow-x: auto;
    margin: 1.5rem 0;
}

.cb-article-body pre code {
    background: none;
    padding: 0;
}

/* --- Footer --- */
.cb-footer {
    background: var(--cb-navy-mid);
    border-top: 1px solid var(--cb-border);
    padding: 2rem 0;
    text-align: center;
}

.cb-footer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.cb-footer-logo {
    height: 22px;
    width: auto;
    opacity: 0.7;
}

.cb-footer p {
    font-size: 0.85rem;
    color: var(--cb-grey);
}

/* --- Skeleton loading --- */
.cb-skeleton {
    background: linear-gradient(90deg, var(--cb-navy-light) 25%, var(--cb-navy-mid) 50%, var(--cb-navy-light) 75%);
    background-size: 200% 100%;
    animation: cb-shimmer 1.5s infinite;
    border-radius: 0.5rem;
}

@keyframes cb-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* --- Back link --- */
.cb-back {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--cb-cyan);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1.5rem;
    transition: color 0.2s;
}

.cb-back:hover {
    color: var(--cb-green);
}

/* --- Empty state --- */
.cb-empty {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--cb-grey);
    font-size: 0.95rem;
}