/* Digital Diachrony, KEDIVIM NKUA programme 1829: shared site styles */

:root {
    --deep-navy: #0a1128;
    --rich-blue: #1c2541;
    --gold-accent: #d4af37;
    --gold-text: #8a6d10;
    --soft-white: #f8fafc;
    --pure-white: #ffffff;
    --ink: #1e293b;
    --ink-soft: #475569;
    --ink-muted: #64748b;
    --rule: #e2e8f0;
    --rule-dark: rgba(255, 255, 255, 0.12);
    --font-body: 'Manrope', 'Segoe UI', Arial, sans-serif;
    --font-display: 'GFS Didot', 'Gentium Plus', Georgia, serif;
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    margin: 0;
    color: var(--ink);
    line-height: 1.8;
    background-color: var(--pure-white);
}

body.lang-gr .show-en { display: none !important; }
body.lang-en .show-gr { display: none !important; }

h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 400;
    color: var(--deep-navy);
    margin-top: 0;
}

a { color: inherit; }

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.narrow { max-width: 820px; }

.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
}
.skip-link:focus {
    left: 1rem;
    top: 1rem;
    background: var(--deep-navy);
    color: var(--pure-white);
    padding: 0.6rem 1rem;
    z-index: 2000;
}

:focus-visible { outline: 2px solid var(--gold-accent); outline-offset: 3px; }

/* --- HEADER --- */
header.site-header {
    background: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--rule);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
}

.logo-group { display: flex; align-items: center; gap: 1.5rem; }
.logo-group img { height: 60px; width: auto; display: block; }

.nav-right { display: flex; align-items: center; gap: 2.5rem; }

nav.main-nav ul { display: flex; flex-wrap: wrap; list-style: none; gap: 1.8rem; margin: 0; padding: 0; }
nav.main-nav a {
    text-decoration: none;
    color: var(--deep-navy);
    font-weight: 700;
    font-size: 0.8rem;
    letter-spacing: 1.5px;
    position: relative;
}
nav.main-nav a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background: var(--gold-accent);
    transition: width 0.3s;
}
nav.main-nav a:hover::after,
nav.main-nav a[aria-current="page"]::after { width: 100%; }

.lang-switch {
    display: flex;
    border-bottom: 1px solid #cbd5e1;
    padding: 2px;
}
.lang-btn {
    background: transparent;
    border: none;
    padding: 6px 12px;
    cursor: pointer;
    font-family: var(--font-body);
    font-weight: 700;
    font-size: 0.8rem;
    color: var(--ink-muted);
}
.lang-btn[aria-pressed="true"] { color: var(--deep-navy); border-bottom: 2px solid var(--gold-accent); }

/* --- HERO --- */
.hero {
    position: relative;
    background-image: url('../images/10.jpg');
    background-color: var(--deep-navy);
    background-size: cover;
    background-position: center;
    padding: 12rem 0 11rem;
    text-align: center;
}
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(10, 17, 40, 0.78);
    z-index: 1;
}
.hero-content { position: relative; z-index: 2; max-width: 980px; margin: 0 auto; }

.hero-kicker {
    color: var(--gold-accent);
    font-family: var(--font-body);
    font-size: 0.95rem;
    letter-spacing: 4px;
    margin: 0 0 1.8rem 0;
    font-weight: 700;
}
.hero-brand {
    font-family: var(--font-display);
    font-size: 4.2rem;
    line-height: 1.15;
    color: var(--pure-white);
    margin: 0 0 1.6rem 0;
}
.hero-title {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: 1.9rem;
    color: #f1f5f9;
    margin: 0 auto 1.2rem;
    max-width: 820px;
    line-height: 1.35;
}
.hero-subtitle {
    font-size: 1.15rem;
    color: #e2e8f0;
    margin: 0 auto 3.5rem;
    font-weight: 400;
    max-width: 760px;
}
.hero-actions { display: flex; justify-content: center; gap: 1.5rem; flex-wrap: wrap; }

.btn-cta {
    background: transparent;
    color: var(--pure-white);
    padding: 1.2rem 3rem;
    text-decoration: none;
    font-weight: 700;
    display: inline-block;
    letter-spacing: 2.5px;
    font-size: 0.9rem;
    border: 1px solid var(--gold-accent);
    transition: background 0.3s, color 0.3s;
}
.btn-cta:hover, .btn-cta:focus-visible { background: var(--gold-accent); color: var(--deep-navy); }
.btn-cta.solid { background: var(--gold-accent); color: var(--deep-navy); }
.btn-cta.solid:hover { background: var(--pure-white); }

.hero-dates {
    margin-top: 2.2rem;
    font-size: 0.95rem;
    letter-spacing: 1px;
    color: #e2e8f0;
}
.hero-dates .d + .d { margin-left: 2rem; }
.hero-dates strong { color: var(--pure-white); }

/* --- STATS --- */
.stats { background: var(--pure-white); padding: 4.5rem 0; border-bottom: 1px solid var(--rule); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2rem; }
.stat-item { text-align: center; }
.stat-item .num {
    font-family: var(--font-display);
    font-size: 3.4rem;
    line-height: 1.1;
    margin: 0;
    color: var(--deep-navy);
}
.stat-item .label {
    font-size: 0.8rem;
    letter-spacing: 2px;
    color: var(--ink-muted);
    font-weight: 700;
    margin-top: 0.8rem;
}

/* --- SECTIONS --- */
.section { padding: 7rem 0; }
.section.alt { background: var(--soft-white); }
.section-header { margin-bottom: 3.5rem; }
.section-header h2 { font-size: 2.7rem; margin-bottom: 1rem; }
.section-header .line { width: 90px; height: 2px; background: var(--gold-accent); }
.section-lead { font-size: 1.15rem; color: var(--ink-soft); max-width: 820px; }

.prose p { font-size: 1.12rem; margin: 0 0 1.6rem 0; color: var(--ink-soft); }
.prose p:last-child { margin-bottom: 0; }

.about-content {
    display: grid;
    grid-template-columns: 1.25fr 0.75fr;
    gap: 5rem;
    align-items: start;
}

.audience {
    margin-top: 3rem;
    padding-top: 1.4rem;
    border-top: 1px solid var(--gold-accent);
}
.audience h3 {
    font-family: var(--font-body);
    font-size: 0.85rem;
    letter-spacing: 2.5px;
    font-weight: 700;
    color: var(--gold-text);
    margin-bottom: 0.8rem;
}
.audience p { margin: 0; }

.grid-images { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.grid-images img {
    width: 100%;
    height: 240px;
    object-fit: cover;
    filter: grayscale(100%) contrast(1.05);
    transition: filter 0.5s;
}
.grid-images img:hover { filter: grayscale(0%); }

/* --- MODULES (dark band) --- */
.bg-dark { background: var(--deep-navy); color: var(--pure-white); }
.bg-dark h2, .bg-dark h3 { color: var(--pure-white); }
.bg-dark .section-lead { color: #cbd5e1; }

.module-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--rule-dark); }
.module {
    display: grid;
    grid-template-columns: 7rem 1fr;
    gap: 2.5rem;
    padding: 2.8rem 0;
    border-bottom: 1px solid var(--rule-dark);
}
.module-num {
    font-family: var(--font-display);
    font-size: 3.2rem;
    line-height: 1;
    color: var(--gold-accent);
}
.module-meta {
    font-size: 0.78rem;
    letter-spacing: 2px;
    color: #94a3b8;
    font-weight: 700;
    margin-bottom: 0.6rem;
}
.module-meta .m + .m { margin-left: 1.5rem; }
.module h3 { color: var(--gold-accent); font-size: 1.75rem; margin-bottom: 0.9rem; }
.module p { color: #e2e8f0; font-size: 1.08rem; margin: 0 0 1.2rem 0; }
.subunits-label { font-size: 0.78rem; letter-spacing: 2px; color: #94a3b8; font-weight: 700; margin-bottom: 0.4rem; }
.subunits { list-style: none; margin: 0; padding: 0; columns: 2; column-gap: 2.5rem; }
.subunits li { color: #cbd5e1; font-size: 0.98rem; padding: 0.25rem 0; break-inside: avoid; }

/* --- TABLES (horizontal rules only) --- */
.rule-table { width: 100%; border-collapse: collapse; font-size: 1.02rem; margin: 0 0 1.5rem 0; }
.rule-table caption { text-align: left; font-family: var(--font-display); font-size: 1.35rem; color: var(--deep-navy); padding-bottom: 0.8rem; }
.rule-table thead tr { border-top: 2px solid var(--gold-accent); border-bottom: 1px solid #94a3b8; }
.rule-table tbody tr:last-child { border-bottom: 2px solid var(--gold-accent); }
.rule-table th { text-align: left; font-size: 0.8rem; letter-spacing: 1.5px; color: var(--ink-muted); padding: 0.75rem 1rem 0.75rem 0; font-weight: 700; }
.rule-table td { padding: 0.7rem 1rem 0.7rem 0; color: var(--ink-soft); vertical-align: top; }
.rule-table .num { text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }
.table-wrap { overflow-x: auto; }

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: start; }

/* --- CERTIFICATION --- */
.cert-facts { list-style: none; margin: 0 0 3rem 0; padding: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 2.5rem; max-width: 820px; }
.cert-facts li { border-top: 1px solid var(--gold-accent); padding-top: 1.1rem; }
.cert-facts .big { font-family: var(--font-display); font-size: 1.6rem; color: var(--deep-navy); display: block; line-height: 1.3; }
.cert-facts .small { color: var(--ink-muted); font-size: 0.98rem; display: block; margin-top: 0.4rem; }

.points { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--rule); }
.points li { padding: 1rem 0; border-bottom: 1px solid var(--rule); color: var(--ink-soft); }
.points strong { color: var(--deep-navy); }

/* --- STEPS --- */
.steps { counter-reset: step; list-style: none; margin: 0; padding: 0; }
.steps li { counter-increment: step; position: relative; padding: 0 0 1.6rem 3.4rem; color: var(--ink-soft); font-size: 1.05rem; }
.steps li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: -0.2rem;
    font-family: var(--font-display);
    font-size: 2rem;
    line-height: 1;
    color: var(--gold-text);
}

.note { font-size: 0.95rem; color: var(--ink-muted); }

/* --- FAQ --- */
.faq { border-top: 1px solid var(--rule); }
.faq details { border-bottom: 1px solid var(--rule); padding: 1.2rem 0; }
.faq summary {
    cursor: pointer;
    font-family: var(--font-display);
    font-size: 1.35rem;
    color: var(--deep-navy);
    list-style: none;
    position: relative;
    padding-right: 2.5rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; position: absolute; right: 0.4rem; top: 0; color: var(--gold-text); font-family: var(--font-body); }
.faq details[open] summary::after { content: '\2212'; }
.faq details p { margin: 0.9rem 0 0 0; color: var(--ink-soft); font-size: 1.05rem; max-width: 820px; }

/* --- LISTINGS (blog, guides) --- */
.page-head { padding: 6rem 0 3rem; border-bottom: 1px solid var(--rule); }
.page-head h1 { font-size: 3rem; margin-bottom: 0.8rem; }
.page-head p { color: var(--ink-soft); font-size: 1.12rem; max-width: 760px; margin: 0; }

.entry-list { list-style: none; margin: 0; padding: 0; }
.entry { padding: 2.4rem 0; border-bottom: 1px solid var(--rule); }
.entry .meta { font-size: 0.8rem; letter-spacing: 1.5px; color: var(--ink-muted); font-weight: 700; margin-bottom: 0.4rem; }
.entry h2 { font-size: 1.9rem; margin-bottom: 0.6rem; }
.entry h2 a { text-decoration: none; }
.entry h2 a:hover { color: var(--gold-text); }
.entry p { color: var(--ink-soft); margin: 0 0 0.8rem 0; font-size: 1.05rem; }
.more { font-weight: 700; color: var(--gold-text); text-decoration: none; letter-spacing: 1px; font-size: 0.9rem; }
.more:hover { text-decoration: underline; }

/* --- ARTICLE --- */
.article { padding: 5rem 0 6rem; }
.article .meta { font-size: 0.85rem; letter-spacing: 1.5px; color: var(--ink-muted); font-weight: 700; margin-bottom: 1rem; }
.article h1 { font-size: 2.8rem; line-height: 1.2; margin-bottom: 2rem; }
.article p { font-size: 1.14rem; color: var(--ink-soft); margin: 0 0 1.5rem 0; }
.article .byline { margin-top: 2.5rem; padding-top: 1.2rem; border-top: 1px solid var(--rule); color: var(--ink-muted); font-size: 0.98rem; }
.article-figure { margin: 0 0 2.5rem 0; }
.article-figure img { width: 100%; height: 320px; object-fit: cover; filter: grayscale(100%) contrast(1.05); display: block; }
.back { display: inline-block; margin-bottom: 2rem; text-decoration: none; color: var(--gold-text); font-weight: 700; font-size: 0.9rem; letter-spacing: 1px; }

/* --- FOOTER --- */
footer.site-footer {
    background: #050914;
    color: var(--pure-white);
    padding: 6rem 0 3rem;
    text-align: center;
}
.footer-logos { display: flex; justify-content: center; gap: 4rem; margin-bottom: 3.5rem; align-items: center; }
.footer-logos img { height: 90px; background: var(--pure-white); padding: 12px; display: block; }
.footer-info h2 { color: var(--pure-white); letter-spacing: 3px; margin-bottom: 1.2rem; font-size: 1.25rem; }
.footer-info p { margin: 0.4rem 0; font-size: 1.02rem; color: #cbd5e1; }
.footer-contacts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2.5rem; margin: 3.5rem auto 0; max-width: 1050px; text-align: left; border-top: 1px solid var(--rule-dark); padding-top: 2.5rem; }
.footer-contacts h3 { font-family: var(--font-body); font-size: 0.78rem; letter-spacing: 2px; color: var(--gold-accent); font-weight: 700; margin-bottom: 0.8rem; }
.footer-contacts p { margin: 0.25rem 0; font-size: 0.98rem; color: #cbd5e1; }
.footer-contacts a { color: var(--pure-white); text-decoration: none; border-bottom: 1px solid var(--gold-accent); }
.copyright { margin-top: 3.5rem; border-top: 1px solid var(--rule-dark); padding-top: 2rem; font-size: 0.88rem; color: #94a3b8; }

@media (max-width: 1000px) {
    .nav-wrapper { flex-direction: column; gap: 1rem; }
    .nav-right { flex-direction: column; gap: 1rem; }
    nav.main-nav ul { justify-content: center; gap: 1.1rem 1.5rem; }
}

@media (max-width: 900px) {
    .hero { padding: 7rem 0 6rem; }
    .hero-brand { font-size: 2.6rem; }
    .hero-title { font-size: 1.45rem; }
    .hero-dates .d { display: block; }
    .hero-dates .d + .d { margin-left: 0; margin-top: 0.4rem; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); row-gap: 2.5rem; }
    .about-content, .two-col { grid-template-columns: 1fr; gap: 3rem; }
    .module { grid-template-columns: 1fr; gap: 0.8rem; }
    .subunits { columns: 1; }
    .cert-facts { grid-template-columns: 1fr; gap: 1.8rem; }
    .footer-logos { gap: 2rem; }
    .footer-contacts { grid-template-columns: 1fr; text-align: center; }
    .section { padding: 4.5rem 0; }
    .section-header h2 { font-size: 2.1rem; }
    .page-head h1, .article h1 { font-size: 2.2rem; }
}

@media (max-width: 520px) {
    .container { padding: 0 1rem; }
    .logo-group img { height: 48px; }
    .footer-logos img { height: 70px; }
    .stat-item .num { font-size: 2.6rem; }
    .btn-cta { padding: 1rem 1.6rem; letter-spacing: 1.5px; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    * { transition: none !important; }
}