/* ============================================================
   VARIABILI CSS — Colori, font, spaziature
   Usiamo "custom properties" (variabili CSS) così possiamo
   cambiare tema (chiaro/scuro) facilmente.
   ============================================================ */

:root {
    /* --- Colori principali (tema chiaro) --- */
    --color-bg: #f8f9fa;               /* Sfondo generale */
    --color-bg-alt: #ffffff;            /* Sfondo alternativo (sezioni alterne) */
    --color-surface: #ffffff;           /* Sfondo card/pannelli */
    --color-text: #1a1a2e;             /* Testo principale */
    --color-text-secondary: #6b7280;   /* Testo secondario */
    --color-primary: #10b981;          /* Colore accento principale (verde smeraldo) */
    --color-primary-light: #34d399;    /* Versione chiara del primario */
    --color-primary-dark: #059669;     /* Versione scura del primario */
    --color-accent: #06b6d4;           /* Colore accento secondario (ciano/teal) */
    --color-border: #e5e7eb;           /* Bordi */
    --color-shadow: rgba(0, 0, 0, 0.08); /* Ombre */
    --color-nav-bg: rgba(248, 249, 250, 0.85); /* Sfondo navbar trasparente */

    /* --- Gradiente principale --- */
    --gradient: linear-gradient(135deg, var(--color-primary), var(--color-accent));

    /* --- Font --- */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Playfair Display', Georgia, serif;

    /* --- Spaziature --- */
    --section-padding: 100px 0;
    --container-width: 1100px;

    /* --- Bordi arrotondati --- */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;

    /* --- Transizioni --- */
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================
   TEMA SCURO — Si attiva aggiungendo la classe "dark" al body
   ============================================================ */
body.dark {
    --color-bg: #0f172a;
    --color-bg-alt: #1e293b;
    --color-surface: #1e293b;
    --color-text: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-border: #334155;
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-nav-bg: rgba(15, 23, 42, 0.85);
}

/* ============================================================
   RESET & BASE — Regole di base per tutti gli elementi
   ============================================================ */

/* Reset: azzera margini, padding, e rende i box-sizing uniformi */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Scroll fluido quando si clicca su un link interno (#sezione) */
html {
    scroll-behavior: smooth;
}

/* Stili base del body */
body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    /* Transizione fluida per il cambio tema */
    transition: background-color var(--transition), color var(--transition);
    overflow-x: hidden; /* Evita scroll orizzontale */
}

/* Link: togliamo la sottolineatura di default */
a {
    text-decoration: none;
    color: var(--color-primary);
    transition: color var(--transition);
}
a:hover {
    color: var(--color-primary-light);
}

/* Liste senza pallini */
ul {
    list-style: none;
}

/* Immagini responsive */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ============================================================
   CONTENITORE — Centra il contenuto e limita la larghezza
   ============================================================ */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================================
   NAVBAR — Barra di navigazione
   ============================================================ */
#navbar {
    position: fixed;                    /* Fissa in cima alla pagina */
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;                     /* Sopra tutto il resto */
    background: var(--color-nav-bg);
    backdrop-filter: blur(12px);       /* Effetto "vetro smerigliato" */
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition);
}

/* Quando si scrolla, la navbar diventa più compatta */
#navbar.scrolled {
    box-shadow: 0 4px 20px var(--color-shadow);
}

/* Contenitore interno della navbar */
.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 70px;
    display: flex;                     /* Flexbox per allineare gli elementi */
    align-items: center;
    justify-content: space-between;
}



/* Logo nel navbar */
.nav-logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient);
    /* Questo trucco colora il testo con il gradiente */
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Link di navigazione (desktop) */
.nav-links {
    display: flex;
    gap: 32px;
}
.nav-links a {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    position: relative;
    padding: 4px 0;
}
/* Linea animata sotto il link al passaggio del mouse */
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient);
    transition: width var(--transition);
}
.nav-links a:hover {
    color: var(--color-text);
}
.nav-links a:hover::after {
    width: 100%;
}

/* Bottone tema chiaro/scuro */
#theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text);
    padding: 8px;
    border-radius: 50%;
    transition: background var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}
#theme-toggle:hover {
    background: var(--color-border);
}
/* Mostra/nascondi icona sole/luna in base al tema */
.icon-sun { display: none; }
body.dark .icon-moon { display: none; }
body.dark .icon-sun { display: block; }

/* Hamburger menu (visibile solo su mobile) */
#menu-toggle {
    display: none;            /* Nascosto su desktop */
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}
#menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition);
    border-radius: 2px;
}
/* Animazione X quando il menu è aperto */
#menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
#menu-toggle.active span:nth-child(2) {
    opacity: 0;
}
#menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Menu mobile (nascosto di default) */
#mobile-menu {
    display: none;
    flex-direction: column;
    padding: 16px 24px 24px;
    gap: 16px;
}
#mobile-menu.active {
    display: flex;
}
#mobile-menu a {
    color: var(--color-text);
    font-weight: 500;
    padding: 8px 0;
    border-bottom: 1px solid var(--color-border);
}

/* ============================================================
   HERO SECTION — Schermata principale
   ============================================================ */
#hero {
    min-height: 100vh;                 /* Occupa tutta l'altezza dello schermo */
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: var(--color-bg);
}

/* Canvas delle particelle sullo sfondo */
#particles-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;                        /* Dietro al contenuto */
}

/* Contenuto della hero sovrapposto al canvas */
.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 0 24px;
}

/* "Ciao, mi chiamo" — piccolo testo sopra il nome */
.hero-greeting {
    font-size: 1.1rem;
    color: var(--color-primary);
    font-weight: 500;
    margin-bottom: 12px;
    /* Animazione di entrata */
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s forwards 0.3s;
}

/* Nome grande */
.hero-name {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4.5rem); /* Responsive: si adatta allo schermo */
    line-height: 1.1;
    margin-bottom: 16px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s forwards 0.5s;
}

/* Testo con gradiente */
.gradient-text {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Sottotitolo con ruolo "digitato" */
.hero-title {
    font-size: clamp(1.2rem, 3vw, 1.8rem);
    color: var(--color-text-secondary);
    margin-bottom: 24px;
    min-height: 2.5rem;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s forwards 0.7s;
}

/* Cursore lampeggiante dell'effetto typing */
.cursor {
    animation: blink 1s step-end infinite;
    color: var(--color-primary);
    font-weight: 300;
}

/* Descrizione breve */
.hero-description {
    max-width: 600px;
    margin: 0 auto 32px;
    color: var(--color-text-secondary);
    font-size: 1.05rem;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s forwards 0.9s;
}

/* Bottoni hero */
.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 40px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s forwards 1.1s;
}

/* Link social nella hero */
.hero-socials {
    display: flex;
    gap: 20px;
    justify-content: center;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s forwards 1.3s;
}
.hero-socials a {
    color: var(--color-text-secondary);
    transition: all var(--transition);
    padding: 8px;
    border-radius: 50%;
}
.hero-socials a:hover {
    color: var(--color-primary);
    background: rgba(99, 102, 241, 0.1);
    transform: translateY(-3px);
}

/* Freccia "scroll down" in basso */
.scroll-indicator {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--color-text-secondary);
    animation: bounce 2s infinite;
    z-index: 1;
}

/* ============================================================
   BOTTONI — Stili dei pulsanti
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all var(--transition);
    border: none;
    font-family: var(--font-sans);
}

/* Bottone principale (pieno, con gradiente) */
.btn-primary {
    background: var(--gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(99, 102, 241, 0.4);
    color: white;
}

/* Bottone secondario (solo bordo) */
.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}
.btn-secondary:hover {
    background: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}


/* ============================================================
   SEZIONI — Stili comuni a tutte le sezioni
   ============================================================ */
.section {
    padding: var(--section-padding);
    background: var(--color-bg);
}

/* Sezioni con sfondo alternativo (per contrasto visivo) */
.section-alt {
    background: var(--color-bg-alt);
}

/* Titolo di sezione */
.section-title {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    margin-bottom: 60px;
    text-align: center;
}

/* Numero della sezione (es. "01.") */
.section-number {
    color: var(--color-primary);
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 600;
    display: block;
    margin-bottom: 8px;
}

/* ============================================================
   ABOUT — Griglia Chi Sono
   ============================================================ */
.about-grid {
    display: grid;
    /* Due colonne: foto (più stretta) e testo (più largo) */
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    align-items: start;
}

/* Image container with decorative border — smaller and square for headshot */
.about-image .image-wrapper {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    aspect-ratio: 1 / 1;              /* Square crop — shows upper portion of photo */
    max-width: 250px;                  /* Smaller max size */
    background: var(--color-surface);
    border: 2px solid var(--color-border);
}

/* Crop the image to show only the top half (head/shoulders) */
.about-image .image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;                 /* Fills the container, cropping excess */
    object-position: top center;       /* Anchors to top — shows head first */
}

/* Pseudo-elemento decorativo dietro la foto */
.about-image .image-wrapper::before {
    content: '';
    position: absolute;
    inset: -8px;
    border-radius: var(--radius-lg);
    background: var(--gradient);
    z-index: -1;
    opacity: 0.3;
}

/* Placeholder foto (finché non metti la vera foto) */
.image-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    color: var(--color-text-secondary);
    background: linear-gradient(135deg, var(--color-surface), var(--color-bg));
}

/* Paragrafi nella bio */
.about-text p {
    margin-bottom: 16px;
    color: var(--color-text-secondary);
    font-size: 1.05rem;
}
.about-text strong {
    color: var(--color-text);
}

/* Card informative (città, ruolo, lingue, interessi) */
.info-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 32px;
}

.info-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}
.info-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--color-shadow);
}
.info-card i {
    color: var(--color-primary);
    flex-shrink: 0;
}
.info-label {
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-secondary);
}
.info-value {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--color-text);
}

/* ============================================================
   TIMELINE — Percorso formativo verticale
   ============================================================ */
.timeline {
    position: relative;
    max-width: 700px;
    margin: 0 auto;
    /* Linea verticale al centro */
    padding-left: 40px;
}
.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gradient);
}

/* Singolo elemento della timeline */
.timeline-item {
    position: relative;
    margin-bottom: 48px;
}
.timeline-item:last-child {
    margin-bottom: 0;
}

/* Pallino sulla linea */
.timeline-dot {
    position: absolute;
    left: -40px;
    top: 0;
    width: 32px;
    height: 32px;
    background: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    /* Ombra luminosa attorno al pallino */
    box-shadow: 0 0 0 6px var(--color-bg-alt), 0 0 20px rgba(99, 102, 241, 0.3);
}
.timeline-dot i {
    width: 16px;
    height: 16px;
}

/* Contenuto della timeline (card) */
.timeline-content {
    background: var(--color-surface);
    padding: 28px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}
.timeline-content:hover {
    border-color: var(--color-primary);
    box-shadow: 0 8px 30px var(--color-shadow);
    transform: translateY(-2px);
}

/* Badge con gli anni */
.timeline-badge {
    display: inline-block;
    background: var(--gradient);
    color: white;
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.timeline-content h3 {
    font-size: 1.3rem;
    margin-bottom: 4px;
    color: var(--color-text);
}
.timeline-content h4 {
    font-size: 1rem;
    color: var(--color-primary);
    margin-bottom: 8px;
    font-weight: 500;
}

/* Istituzione con icona */
.timeline-institution {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    margin-bottom: 12px;
}
.timeline-institution i {
    width: 16px;
    height: 16px;
}

.timeline-content p {
    color: var(--color-text-secondary);
    margin-bottom: 8px;
    font-size: 0.95rem;
}

/* Link alla tesi */
.thesis-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    background: rgba(99, 102, 241, 0.1);
    color: var(--color-primary);
    transition: all var(--transition);
}
.thesis-link:hover {
    background: var(--color-primary);
    color: white;
}
.thesis-link i {
    width: 16px;
    height: 16px;
}

/* ============================================================
   SKILLS — Professional tag-based layout (no percentages)
   ============================================================ */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);  /* Three equal columns */
    gap: 32px;
}

/* Each skill category card */
.skill-category {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: 28px;
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}
.skill-category:hover {
    border-color: var(--color-primary);
    box-shadow: 0 8px 30px var(--color-shadow);
}

/* Category header with icon and title */
.skill-category-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-border);
}
.skill-category-header i {
    color: var(--color-primary);
}
.skill-category-header h3 {
    font-size: 1.1rem;
}

/* Skills displayed as clean tags */
.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.skill-tag {
    padding: 8px 16px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--color-text);
    transition: all var(--transition);
}
.skill-tag:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: rgba(99, 102, 241, 0.06);
    transform: translateY(-1px);
}

/* ============================================================
   PUBLICATIONS — Card pubblicazioni
   ============================================================ */
.publications-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

/* Card singola pubblicazione */
.pub-card {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: 28px;
    border: 1px solid var(--color-border);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}
.pub-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px var(--color-shadow);
}

/* Striscia decorativa in alto sulla card */
.pub-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient);
}

/* Tag "Paper" / "Progetto" */
.pub-card-tag {
    display: inline-block;
    background: rgba(99, 102, 241, 0.1);
    color: var(--color-primary);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
}
.project-tag {
    background: rgba(236, 72, 153, 0.1);
    color: var(--color-accent);
}
/* Tag per le conferenze / talk */
.talk-tag {
    background: rgba(14, 165, 133, 0.1);
    color: #0ea585;
}

.pub-card h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    line-height: 1.4;
}

.pub-authors {
    color: var(--color-primary);
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 4px;
}

.pub-journal {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
    font-style: italic;
    margin-bottom: 12px;
}

.pub-description {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

/* Link della pubblicazione (Paper, Code, ecc.) */
.pub-links {
    display: flex;
    gap: 12px;
}
.pub-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    background: rgba(99, 102, 241, 0.08);
    transition: all var(--transition);
}
.pub-link:hover {
    background: var(--color-primary);
    color: white;
}
.pub-link i {
    width: 14px;
    height: 14px;
}

/* ============================================================
   CONTACT — Sezione contatti
   ============================================================ */
/* Layout centrato per la sezione contatti (senza form, sito statico) */
.contact-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-content h3 {
    font-family: var(--font-display);
    font-size: 2rem;
    margin-bottom: 16px;
}
.contact-content > p {
    color: var(--color-text-secondary);
    margin-bottom: 32px;
    font-size: 1.05rem;
}

/* Dettagli contatto (email, sede, affiliazione) — centrati */
.contact-details {
    display: inline-flex;
    flex-direction: column;
    gap: 20px;
    text-align: left;
}
.contact-item {
    display: flex;
    align-items: center;
    gap: 16px;
}
.contact-item i {
    color: var(--color-primary);
    flex-shrink: 0;
}
.contact-label {
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-secondary);
}
.contact-item a,
.contact-item span {
    font-weight: 500;
    color: var(--color-text);
}


/* ============================================================
   FOOTER — Piede pagina
   ============================================================ */
footer {
    padding: 32px 0;
    border-top: 1px solid var(--color-border);
    background: var(--color-bg);
}
.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}
.footer-links {
    display: flex;
    gap: 16px;
}
.footer-links a {
    color: var(--color-text-secondary);
    transition: color var(--transition);
}
.footer-links a:hover {
    color: var(--color-primary);
}

/* ============================================================
   BACK TO TOP — Bottone "torna su"
   ============================================================ */
#back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;                        /* Nascosto di default */
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
    z-index: 999;
}
/* Visibile quando la classe "visible" è aggiunta da JS */
#back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
#back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 25px rgba(99, 102, 241, 0.4);
}

/* ============================================================
   ANIMAZIONI — Definizioni @keyframes
   ============================================================ */

/* Entrata dal basso con dissolvenza */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Cursore lampeggiante */
@keyframes blink {
    50% { opacity: 0; }
}

/* Freccia che rimbalza */
@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(10px); }
}

/* ============================================================
   ANIMAZIONI SCROLL (AOS - Animate On Scroll)
   Elementi con data-aos entrano con animazione quando visibili
   ============================================================ */
[data-aos] {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}
[data-aos].aos-animate {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================================
   RESPONSIVE — Adattamento per schermi più piccoli
   ============================================================ */

/* Tablet (sotto 900px) */
@media (max-width: 900px) {
    .about-grid {
        grid-template-columns: 1fr;    /* Una colonna sola */
        gap: 40px;
    }
    .about-image {
        max-width: 300px;
        margin: 0 auto;
    }
    .skills-grid {
        grid-template-columns: 1fr;    /* Stack on tablet/mobile */
    }
    .publications-grid {
        grid-template-columns: 1fr;
    }
}

/* Mobile (sotto 640px) */
@media (max-width: 640px) {
    /* Mostra hamburger, nascondi link desktop */
    .nav-links {
        display: none;
    }
    #menu-toggle {
        display: flex;
    }

    /* Riduci padding delle sezioni */
    .section {
        padding: 60px 0;
    }
    .section-title {
        margin-bottom: 40px;
    }

    /* Info cards: una colonna */
    .info-cards {
        grid-template-columns: 1fr;
    }

    /* Footer impilato */
    .footer-content {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }

    /* Hero: testo più piccolo */
    .hero-name {
        font-size: 2.2rem;
    }
}