:root {
    --bg-color: #0b1120;
    --surface-color: #1e293b;
    --surface-hover: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --icy-blue: #00e5ff;
    --icy-blue-dark: #0096c7;
    --icy-glow: rgba(0, 229, 255, 0.25);
    --border-color: #334155;
    
    --transition: all 0.3s ease;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
}html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    background-image: 
        radial-gradient(circle at 15% 0%, rgba(0, 229, 255, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 85% 100%, rgba(0, 150, 199, 0.08) 0%, transparent 50%);
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.6;
    position: relative;
    z-index: 0;
}

body::before {
    content: '';
    position: fixed;
    top: 0; 
    left: 0; 
    width: 100vw; 
    height: 100vh;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
    z-index: -1;
}

body::after {
    content: '';
    position: fixed;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)'/%3E%3C/svg%3E");
    opacity: 0.025;
    pointer-events: none;
    z-index: 9998;
}

/* custom scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-color); }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--icy-blue-dark); }


/* --- header e nav --- */
.site-header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(11, 17, 32, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo h1 {
    color: var(--icy-blue);
    text-shadow: 0 0 10px var(--icy-glow);
    font-size: 1.4rem;
}

.logo-img {
    width: 3rem;
    height: 3rem;
}

.site-nav a {
    color: var(--text-primary);
    text-decoration: none;
    margin-left: 2rem;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
}

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

.site-nav a.nav-active {
    color: var(--icy-blue);
}

/* --- layout --- */
main {
    width: 100%;
    padding: 0;
}

.container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    z-index: 1;
}

section {
    padding: 6rem 0;
}

.section-alt {
    background-color: color-mix(in srgb, var(--surface-color) 40%, transparent);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    position: relative;
    padding: 6rem 0;
}

.section-alt::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 150px; 
    background: linear-gradient(to bottom, var(--bg-color) 0%, transparent 100%);
    pointer-events: none;
    z-index: 0;
}

.section-alt::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 150px; 
    background: linear-gradient(to top, var(--bg-color) 0%, transparent 100%);
    pointer-events: none;
    z-index: 0;
}

/* hero section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 5rem;
    text-align: center;
    position: relative;
}

.hero::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 900px;
    height: 600px;
    background: radial-gradient(ellipse, rgba(0, 229, 255, 0.05) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: linear-gradient(to right, #fff, var(--icy-blue), #fff);
    background-size: 200% auto;
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.4rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    letter-spacing: 0.03em;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.btn-primary {
    background-color: var(--icy-blue);
    color: #000;
    box-shadow: 0 0 15px var(--icy-glow);
}

.btn-primary:hover {
    background-color: #fff;
    box-shadow: 0 0 25px var(--icy-glow);
}

.btn-outline {
    background-color: transparent;
    color: var(--icy-blue);
    border: 2px solid var(--icy-blue);
    padding: 0.75rem 1.2rem;
}

.btn-outline:hover {
    background-color: var(--icy-glow);
}

/*sections*/
.section-eyebrow {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--icy-blue);
    margin-bottom: 0.75rem;
}

.section-title.reveal {
    transition-delay: 0.08s;
}

.section-title {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
    display: inline-block;
}

.section-title::after {
    content: '';
    display: block;
    width: 50%;
    height: 2px;
    background: var(--icy-blue);
    margin-top: 0.5rem;
}

.tab-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border-bottom: 3px solid transparent;
}

.tab-btn:hover {
    color: var(--icy-blue);
}

.tab-btn.active {
    color: var(--icy-blue);
    border-bottom: 3px solid var(--icy-blue);
}

.tab-content {
    display: none;
    animation: fadeIn 0.4s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.wip-text {
    color: var(--text-secondary);
    font-style: italic;
}

/*cards documenti */
.doc-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.doc-card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.75rem 1.25rem;
    text-decoration: none;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: flex-start;
    transition: var(--transition);
}

.doc-card:hover {
    background-color: rgba(255, 255, 255, 0.03);
    border-color: var(--border-color);
}

.doc-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.doc-info h5 {
    font-size: 0.95rem;
    font-weight: 500;
    margin: 0;
    color: var(--text-primary);
    letter-spacing: 0.2px;
}

.doc-info p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin: 0;
    opacity: 0.7;
    transition: var(--transition);
    white-space: nowrap;
}

.doc-card:hover .doc-info p, .doc-card:hover .doc-info h5 {
    opacity: 1;
    color: var(--icy-blue);
}

.doc-icon {
    color: var(--icy-blue);
    font-size: 1.5rem;
}

.doc-accordion {
    width: 100%;
    margin-bottom: 0.5rem;
}

summary.doc-group-title {
    margin-top: 1.5rem;
    padding: 0.75rem 0.5rem; 
    border-bottom: 1px solid var(--border-color);
    color: var(--icy-blue-dark);
    font-size: 1.2rem;
    text-transform: uppercase;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    list-style: none; 
    user-select: none;
    transition: var(--transition);
}

summary.doc-group-title:hover {
    color: var(--icy-blue);
    border-bottom-color: var(--icy-blue);
}

summary.doc-group-title:hover .chevron {
    color: var(--icy-blue);
}

summary.doc-group-title::-webkit-details-marker {
    display: none;
}

.chevron {
    transition: transform 0.3s ease;
    color: var(--icy-blue-dark);
}

details[open] .chevron {
    transform: rotate(180deg);
}

.accordion-content {
    padding-top: 1rem; 
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.repo-featured {
    max-width: 520px;
}


.repo-card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1rem;
    text-decoration: none;
    margin: 1rem 0;
    color: var(--text-primary);
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.repo-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--icy-blue-dark), var(--icy-blue));
    opacity: 0.6;
    transition: var(--transition);
}

.repo-card:hover {
    transform: translateY(-5px);
    border-color: var(--icy-blue);
    box-shadow: 0 10px 30px rgba(0,0,0,0.4), 0 0 20px var(--icy-glow);
}

.repo-card:hover::before {
    opacity: 1;
    box-shadow: 0 0 15px var(--icy-blue);
}

.repo-info h3 {
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.repo-info p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.repo-action {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--icy-blue);
    display: inline-flex;
    align-items: center;
    transition: var(--transition);
}

.repo-action::after {
    content: '→';
    margin-left: 0.5rem;
    transition: transform 0.3s ease;
}

.repo-card:hover .repo-action {
    color: #fff;
}

.repo-card:hover .repo-action::after {
    transform: translateX(6px); 
}

.repo-icon {
    font-size: 2.5rem;
    color: var(--text-secondary);
    transition: var(--transition);
    padding-left: 1rem;
}

/*team section */
.team-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr); 
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

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

@media (max-width: 550px) {
    .team-grid {
        grid-template-columns: 1fr;
    }
}

.member-card {
    background-color: var(--surface-color);
    border-radius: 12px;
    padding: 2rem 1rem;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
    display: block;
    position: relative;
    overflow: hidden;
}

.member-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--icy-blue-dark), var(--icy-blue));
    opacity: 0.5;
    transition: var(--transition);
}

.member-card:hover::before {
    opacity: 1;
    box-shadow: 0 0 10px var(--icy-blue);
}

.member-card:hover {
    border-color: var(--icy-blue);
    background-color: var(--surface-hover);
    transform: translateY(-4px);
}

.member-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    margin: 0 auto 1rem;
    border: 2px solid var(--icy-blue);
    padding: 4px;
    background-color: var(--bg-color);
    transition: var(--transition);
}

.member-card:hover .member-avatar {
    box-shadow: 0 0 15px var(--icy-glow);
    border-width: 3px;
}

.member-name {
    font-weight: 600;
    font-size: 1.1rem;
    transition: color 0.3s ease;
}

.member-card:hover .member-name {
    color: var(--icy-blue);
}

/* --- footer --- */
footer {
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
}

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

.footer-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 800;
    font-size: 1.1rem;
}

.footer-logo span {
    color: var(--icy-blue);
    text-shadow: 0 0 10px var(--icy-glow);
}

.footer-logo-img {
    width: 1.8rem;
    height: 1.8rem;
}

.footer-nav {
    display: flex;
    gap: 2rem;
}

.footer-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.footer-nav a:hover {
    color: var(--icy-blue);
}

.footer-bottom {
    padding: 1.5rem 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

@media (max-width: 600px) {
    .footer-top {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
}

/* member cards on section-alt need contrast against the lighter background */
.section-alt .member-card {
    background-color: var(--bg-color);
}

.section-alt .member-card:hover {
    background-color: rgba(11, 17, 32, 0.7);
}

/* hero entrance */
.hero h1 {
    animation: fadeIn 0.6s ease both, shimmer 5s linear 0.6s infinite;
}

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

.hero p {
    animation: none;
    opacity: 0;
}

.hero-actions {
    animation: fadeIn 0.6s ease 0.3s both;
}

.scroll-indicator {
    margin-top: 2.5rem;
    color: var(--text-secondary);
    font-size: 1.2rem;
    animation: fadeIn 0.6s ease 0.45s both, bounce 2s ease-in-out 1.2s infinite;
    display: block;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

/* scroll reveal */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- stile glossario per il futuro--- */

.page-content {
    padding-top: 10rem;
    min-height: 80vh;
}

.page-description {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.active-nav {
    color: var(--icy-blue) !important;
}

.glossary-container {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
}

.glossary-letter {
    color: var(--text-secondary);
    font-size: 2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
    margin-top: 2rem;
    margin-bottom: 1.5rem;
}

.glossary-container .glossary-letter:first-child {
    margin-top: 0;
}

.glossary-term {
    margin-bottom: 1.5rem;
}

.glossary-term:last-child {
    margin-bottom: 0;
}

.glossary-term h3 {
    color: var(--icy-blue);
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.glossary-term p {
    color: var(--text-primary);
}


.glossary-index {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 3rem;
    padding: 1rem;
    background-color: rgba(30, 41, 59, 0.5);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.glossary-index a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 6px;
    background-color: var(--surface-color);
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.glossary-index a:hover {
    background-color: var(--icy-blue);
    color: #000;
    border-color: var(--icy-blue);
    box-shadow: 0 0 10px var(--icy-glow);
}

.glossary-index a.disabled {
    opacity: 0.3;
    pointer-events: none;
    cursor: default;
}

.glossary-letter {
    color: var(--text-secondary);
    font-size: 2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
    margin-top: 2rem;
    margin-bottom: 1.5rem;
    scroll-margin-top: 120px; 
}