/* ==========================================================
   Michele Chiumenti - Personal Academic Website
   Version 1.0
========================================================== */

:root{

    --primary:#0F3D5E;
    --secondary:#2C7FB8;
    --accent:#4EA5D9;

    --light:#F6F8FA;
    --white:#FFFFFF;

    --text:#202124;
    --text-light:#666666;

    --shadow:0 12px 35px rgba(0,0,0,.10);

    --radius:18px;

}

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

html{

    scroll-behavior:smooth;

}

body{

    font-family:'Inter',sans-serif;
    background:#ffffff;
    color:var(--text);
    line-height:1.7;

}

img{

    max-width:100%;
    display:block;

}

.container{

    width:min(1200px,92%);
    margin:auto;

}

/************************************************
HEADER
************************************************/

header{

    position:fixed;
    top:0;
    left:0;
    width:100%;

    background:rgba(255,255,255,.90);
    backdrop-filter:blur(10px);

    z-index:999;

    border-bottom:1px solid rgba(0,0,0,.05);

    transition: box-shadow 0.3s ease, background 0.3s ease;

}

header.scrolled {
    box-shadow: 0 4px 20px rgba(0,0,0,.12);
    background: rgba(255,255,255,.98);
}

header .container{

    display:flex;
    justify-content:space-between;
    align-items:center;

    height:78px;

}

.logo{

    font-size:1.35rem;
    font-weight:800;
    color:var(--primary);

}

nav{

    display:flex;
    gap:35px;

}

nav a{

    color:#333;
    text-decoration:none;
    font-weight:500;

    transition:.25s;

}

nav a:hover{

    color:var(--secondary);

}

nav a.active {

    color: var(--secondary);
    font-weight: 700;

}

/************************************************
HERO
************************************************/

.hero{

    position:relative;

    min-height:100vh;

    display:flex;

    align-items:center;

    overflow:hidden;

    color:white;

}

.hero-background{

    position:absolute;

    inset:0;

    background-image:
        linear-gradient(rgba(5,20,35,.72),rgba(5,20,35,.82)),
        url("../images/hero-bg.jpg");

    background-size:cover;
    background-position:center;

    transform:scale(1.05);

}

.hero-grid{

    position:relative;
    z-index:2;

    display:grid;

    grid-template-columns:1.4fr .7fr;

    gap:80px;

    align-items:center;

}

.small-title{

    text-transform:uppercase;

    letter-spacing:3px;

    opacity:.8;

    font-size:.85rem;

}

.hero h1{

    font-size:5rem;
    font-weight:800;
    line-height:1;
    margin:20px 0;

}

.hero h2{

    font-size:2rem;
    font-weight:300;
    margin-bottom:30px;

}

.hero p{

    max-width:650px;

    font-size:1.2rem;

    opacity:.95;

}

.hero-photo{

    display:flex;
    justify-content:center;

}

.hero-photo img{

    width:360px;
    height:360px;

    border-radius:50%;

    object-fit:cover;

    border:8px solid rgba(255,255,255,.25);

    box-shadow:0 30px 70px rgba(0,0,0,.45);

}

/************************************************
BUTTONS
************************************************/

.buttons{

    display:flex;
    gap:18px;

    margin-top:45px;

    flex-wrap:wrap;

}

.button{

    display:inline-block;

    padding:14px 30px;

    border-radius:999px;

    text-decoration:none;

    transition:.30s;

    border:2px solid white;

    color:white;

}

.button:hover{

    transform:translateY(-3px);

}

.button.small {

    padding: 8px 20px;
    font-size: .85rem;

}

.primary{

    background:white;

    color:var(--primary);

    font-weight:700;

}

/************************************************
STATISTICS
************************************************/

.statistics{

    background:#fff;

    margin-top:-70px;

}

.stats-grid{

    display:grid;

    grid-template-columns:repeat(4,1fr);

    gap:25px;

}

.stats-grid div{

    background:white;

    padding:40px;

    border-radius:var(--radius);

    box-shadow:var(--shadow);

    text-align:center;

}

.stats-grid h3{

    color:var(--primary);

    font-size:2.5rem;

    margin-bottom:10px;

}

.stats-grid p{

    color:var(--text-light);

}

/************************************************
SECTIONS
************************************************/

section{

    padding:110px 0;

}

section h2{

    font-size:2.6rem;

    color:var(--primary);

    margin-bottom:60px;

    text-align:center;

}

/************************************************
CARDS
************************************************/

.cards{

    display:grid;

    grid-template-columns:repeat(2,1fr);

    gap:35px;

}

.card{

    background:white;

    padding:45px;

    border-radius:var(--radius);

    box-shadow:var(--shadow);

    transition:.30s;

}

.card:hover{

    transform:translateY(-10px);

}

.card i{

    font-size:2.4rem;

    color:var(--secondary);

    margin-bottom:25px;

}

.card h3{

    margin-bottom:18px;

    color:var(--primary);

}

/************************************************
PUBLICATIONS
************************************************/

.highlight{

    background:var(--light);

}

.publication{

    background:white;

    padding:35px;

    margin-bottom:25px;

    border-radius:var(--radius);

    box-shadow:var(--shadow);

}

.publication h3{

    color:var(--primary);

    margin-bottom:10px;

}

.publication h3 a {

    color: var(--primary);
    text-decoration: none;
    transition: .25s;

}

.publication h3 a:hover {

    color: var(--secondary);

}

.publication ul {

    list-style: none;
    padding: 0;

}
/* ==========================================================
   PUBLICATIONS PAGE
========================================================== */

.pub-filters {

    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 30px;
    flex-wrap: wrap;

}

.filter-btn {

    padding: 10px 25px;
    border-radius: 999px;
    border: 2px solid rgba(255,255,255,.3);
    background: transparent;
    color: white;
    cursor: pointer;
    transition: .3s;
    font-weight: 500;
    font-size: .9rem;

}

.filter-btn:hover,
.filter-btn.active {

    background: white;
    color: var(--primary);
    border-color: white;

}

.pub-header {

    display: flex;
    gap: 15px;
    align-items: center;
    margin-bottom: 15px;
    flex-wrap: wrap;

}

.year-badge {

    background: var(--primary);
    color: white;
    padding: 2px 14px;
    border-radius: 999px;
    font-size: .8rem;
    font-weight: 600;

}

.pub-type {

    background: var(--light);
    color: var(--text-light);
    padding: 2px 14px;
    border-radius: 999px;
    font-size: .75rem;
    font-weight: 500;
    text-transform: uppercase;

}

.citation-count {

    color: var(--secondary);
    font-size: .85rem;
    font-weight: 500;

}

.citation-count i {

    margin-right: 5px;

}

.pub-authors {

    margin: 8px 0;
    color: var(--text-light);
    font-size: .95rem;

}

.pub-journal {

    margin: 8px 0 15px;
    color: var(--text-light);
    font-size: .9rem;

}

.load-more {

    text-align: center;
    margin-top: 40px;

}

#loadMoreBtn {

    background: var(--primary);
    color: white;
    border-color: var(--primary);

}

#loadMoreBtn:hover {

    background: #0a2a40;
    border-color: #0a2a40;

}
/* ==========================================================
   PAGE HEADER (para páginas internas)
========================================================== */

.page-header {

    background: linear-gradient(135deg, #0F3D5E 0%, #1C6EA4 100%);
    color: white;
    padding: 160px 0 80px 0;
    text-align: center;

}

.page-header h1 {

    font-size: 3.5rem;
    font-weight: 800;

}

.page-header p {

    max-width: 700px;
    margin: 20px auto 0;
    font-size: 1.2rem;
    opacity: .9;

}

/* ==========================================================
   CONTACT PAGE
========================================================== */

.contact-grid {

    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;

}

.contact-info {

    background: white;
    padding: 45px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);

}

.contact-info h2,
.contact-links h2 {

    color: var(--primary);
    margin-bottom: 30px;
    font-size: 1.8rem;

}

.contact-info p {

    margin-bottom: 20px;
    display: flex;
    align-items: flex-start;
    gap: 15px;

}

.contact-info i {

    color: var(--secondary);
    font-size: 1.3rem;
    width: 25px;
    margin-top: 4px;

}

.contact-info a {

    color: var(--text);
    text-decoration: none;
    transition: .25s;

}

.contact-info a:hover {

    color: var(--secondary);

}

.contact-links {

    background: white;
    padding: 45px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);

}

.contact-links .button {

    display: block;
    text-align: center;
    margin-bottom: 15px;
    border-color: var(--primary);
    color: var(--primary);
    background: transparent;

}

.contact-links .button:hover {

    background: var(--primary);
    color: white;
    transform: translateY(-3px);

}

.contact-links .button i {

    margin-right: 10px;

}

.contact-links .button.primary {

    background: var(--primary);
    color: white;

}

.contact-links .button.primary:hover {

    background: #0a2a40;
    border-color: #0a2a40;

}

/* Estilos para los contenedores desplegables (Acordeones) */
.pub-group {
    background: #f8f9fa;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    margin-bottom: 15px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.pub-group[open] {
    background: #ffffff;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}


/* ==========================================================
   DESPLEGABLES
========================================================== */

.pub-group-summary {
    padding: 15px 20px;
    font-size: 1.2rem;
    font-weight: 600;
    color: #2c3e50;
    cursor: pointer;
    list-style: none; /* Quita la flecha nativa en algunos navegadores */
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

/* Flecha personalizada */
.pub-group-summary::after {
    content: '\f107'; /* Icono de flecha hacia abajo de FontAwesome */
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    transition: transform 0.3s ease;
}

.pub-group[open] .pub-group-summary::after {
    transform: rotate(180deg);
}

.pub-group-summary:hover {
    background: #edf2f7;
}

/* Contenedor interno de las publicaciones */
.pub-group-content {
    padding: 20px;
    border-top: 1px solid #e2e8f0;
}



/* ==========================================================
   RESEARCH CARDS
========================================================== */

.research-card {

    display: block;
    position: relative;
    border-radius: 22px;
    overflow: hidden;
    aspect-ratio: 4/3;
    text-decoration: none;
    box-shadow: 0 20px 45px rgba(0,0,0,.15);
    transition: .4s;

}

.research-card:hover {

    transform: translateY(-10px);

}

.research-card img {

    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: .6s;

}

.research-card:hover img {

    transform: scale(1.08);

}

.research-overlay {

    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 35px;
    background: linear-gradient(
        rgba(0,0,0,.05),
        rgba(0,0,0,.82)
    );
    color: white;

}

.research-overlay h3 {

    font-size: 1.6rem;
    margin-bottom: 12px;

}

.research-overlay p {

    line-height: 1.5;
    opacity: .9;

}

.fade {

    opacity: 0;
    transform: translateY(40px);
    transition: all .8s ease;

}

.visible {

    opacity: 1;
    transform: translateY(0);

}

/* ==========================================================
   FOOTER
========================================================== */

footer {
    background: var(--primary);
    color: white;
    text-align: center;
    padding: 40px 0;
    margin-top: 60px;
}

footer .container p {
    margin: 5px 0;
    opacity: .8;
    font-size: .9rem;
}

footer .copyright {
    font-weight: 600;
    opacity: 1;
}

/* ==========================================================
   PUBLICATIONS LIST CONTAINER
========================================================== */

#publicationsList {
    margin-top: 30px;
}

.publication .button {
    margin-right: 10px;
    margin-top: 10px;
}

.button.small {
    padding: 6px 16px;
    font-size: .8rem;
}

/* ==========================================================
   RESPONSIVE General (Tablets y vistas intermedias)
========================================================== */

@media(max-width:900px){

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .page-header h1 {
        font-size: 2.4rem;
    }

    .page-header {
        padding: 130px 0 50px 0;
    }

    .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }

    .hero h1 {
        font-size: 3.5rem;
    }

    .hero h2 {
        font-size: 1.5rem;
    }

    .hero p {
        margin: 0 auto;
    }

    .hero-photo img {
        width: 240px;
        height: 240px;
    }

    .buttons {
        justify-content: center;
    }

    .stats-grid {
        grid-template-columns: repeat(2,1fr);
    }

    .cards {
        grid-template-columns: 1fr;
    }

    nav {
        gap: 15px;
        flex-wrap: wrap;
        justify-content: center;
    }

    header .container {
        height: auto;
        padding: 15px 0;
        flex-wrap: wrap;
        gap: 10px;
    }

    .logo {
        font-size: 1.1rem;
    }

    .page-header h1 {
        font-size: 2rem;
    }

    .page-header {
        padding: 120px 0 40px 0;
    }
}

/* ==========================================================
   GLOBAL RESPONSIVE MOBILE MENU (HAMBURGER)
========================================================== */
.menu-toggle {
    display: none; /* Oculto en ordenadores de escritorio */
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: inherit;
    padding: 10px;
    z-index: 100000;
}

@media (max-width: 768px) {
    header .container {
        display: flex;
        justify-content: space-between;
        align-items: center;
        position: relative;
        width: 100%;
        padding: 12px 4%; 
    }

    .menu-toggle {
        display: block; /* Aparece únicamente en pantallas móviles */
        padding: 5px;   
    }

    header nav {
        display: none; /* Ocultamos el menú horizontal clásico */
        flex-direction: column;
        position: absolute;
        top: 100%; 
        left: 0;
        width: 100%;
        background-color: #ffffff; 
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
        padding: 8px 0;
        z-index: 99999;
        
        /* Sistema de seguridad anti-recortes verticales */
        max-height: calc(100vh - 78px);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    /* ¡CORREGIDO! Mantenemos el fondo del menú móvil siempre blanco puro al hacer scroll 
       para evitar que las letras oscuras desaparezcan en un fondo negro */
    header.scrolled nav {
        background-color: #ffffff !important; 
    }

    /* Clase activada por JavaScript para mostrar/ocultar */
    header nav.open {
        display: flex !important;
    }

    header nav a {
        padding: 10px 20px; 
        line-height: 1.3;
        width: 100%;
        display: block;
        box-sizing: border-box;
        border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    }

    header nav a:last-child {
        border-bottom: none;
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .stats-grid div {
        padding: 25px 20px;
    }
}

/* ==========================================================
   Estilos para el Submenú Desplegable (Dropdown)
========================================================== */
.dropdown {
    position: relative;
    display: inline-block;
}

/* Enlace principal del menú */
.dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
}

/* Fuerza el color azul en la pestaña principal "Projects" cuando está activa */
nav .dropdown-toggle.active,
a.dropdown-toggle.active,
.dropdown-toggle.active {
    color: var(--secondary) !important;
    font-weight: 700 !important;
}

/* Contenedor del submenú oculto por defecto */
.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background-color: #ffffff;
    min-width: 180px;
    box-shadow: 0px 8px 16px rgba(0, 0, 0, 0.1);
    border-radius: 6px;
    padding: 8px 0;
    z-index: 1000;
}

/* Enlaces internos del submenú */
.dropdown-menu a {
    color: #333333 !important; 
    padding: 10px 20px;
    text-decoration: none;
    display: block;
    text-align: left;
    font-size: 0.95rem;
    font-weight: 500;
    transition: background 0.2s, color 0.2s;
    border-bottom: none !important; 
}

/* Hover en submenú */
.dropdown-menu a:hover {
    background-color: #f8f9fa;
    color: var(--secondary) !important; 
}

/* Destacado interno si la subpágina está abierta */
.dropdown-menu a.active {
    color: var(--secondary) !important;
    font-weight: 700;
    background-color: #f8f9fa;
}

/* Muestra el submenú en ordenadores */
.dropdown:hover .dropdown-menu {
    display: block;
}

/* Adaptación para el menú móvil */
@media (max-width: 768px) {
    .dropdown {
        display: block;
        width: 100%;
    }
    .dropdown-menu {
        position: static;
        transform: none;
        box-shadow: none;
        background-color: rgba(0, 0, 0, 0.03);
        padding-left: 15px;
        display: block; 
    }
    
    /* Enlaces del submenú aún más juntos en el móvil */
    .dropdown-menu a {
        padding: 7px 20px !important; 
    }
}