/* ============================================
   FOSSPA · Portale FOSS per la PA
   Identità visiva professionale ispirata a AGID/Developers Italia
   Aggiornato con Logo TUX e miglioramenti UI
   ============================================ */

/* ----- RESET & VARIABILI (Tema Professionale) ----- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colori primari (Blu Istituzionale Professionale) */
    --color-primary: #003366;          /* Blu scuro professionale (AGID) */
    --color-primary-light: #004080;    /* Blu medio */
    --color-primary-dark: #002244;     /* Blu molto scuro */
    
    /* Colori secondari (Blu chiaro per accenti) */
    --color-secondary: #005588;        /* Blu secondario */
    --color-secondary-light: #4a90e2;  /* Blu chiaro per hover */
    
    /* Colori neutri */
    --color-bg: #f8f9fa;               /* Grigio molto chiaro (sfondo) */
    --color-card: #ffffff;             /* Bianco (card) */
    --color-text: #212529;             /* Nero professionale */
    --color-text-muted: #6c757d;       /* Grigio per testo secondario */
    --color-border: #dee2e6;           /* Grigio chiaro per bordi */
    
    /* Ombre e bordi */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.15);
    --radius: 8px;                     /* Bordo arrotondato standard */
    --radius-sm: 6px;                  /* Bordo arrotondato piccolo */
    --radius-full: 50px;               /* Bordo completamente arrotondato */
    
    /* Transizioni e font */
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --font-heading: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --max-width: 1200px;
}

/* ----- BASE ----- */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: var(--color-primary);
    transition: var(--transition);
}

a:hover {
    color: var(--color-primary-dark);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ----- HEADER (Stile Professionale con Logo TUX) ----- */
.site-header {
    background: var(--color-primary);
    color: #fff;
    padding: 12px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
    border-bottom: 3px solid var(--color-secondary);
    transition: padding 0.3s ease, box-shadow 0.3s ease;
}

/* Effetto scroll: header più compatto */
.site-header.scrolled {
    padding: 8px 0;
    box-shadow: var(--shadow-md);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}

/* ----- LOGO con TUX (mantiene equilibrio durante lo scroll) ----- */
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.8rem;
    letter-spacing: -0.5px;
    color: #fff;
    height: 100%;
    min-height: 48px; /* Altezza minima per mantenere stabilità */
}

/* Immagine del logo TUX - legata al font-size per scalare con lo scroll */
.logo-img {
    height: 1.4em;           /* Legata alla dimensione del font di FOSSPA */
    width: auto;             /* Mantiene le proporzioni */
    max-height: 52px;        /* Limite massimo per sicurezza */
    display: block;
    flex-shrink: 0;          /* Non si restringe mai */
    object-fit: contain;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
    transition: height 0.3s ease;
}

/* Versione icona di fallback se l'immagine non carica */
.logo .logo-fallback {
    display: none;
    color: var(--color-secondary-light);
    font-size: 2rem;
}

.logo-img:not([src]) + .logo-fallback {
    display: inline-block;
}

.logo small {
    font-size: 0.65rem;
    font-weight: 400;
    opacity: 0.85;
    display: block;
    letter-spacing: 0.5px;
    margin-top: -2px;
    font-family: var(--font-body);
}

/* Badge "Open Source" accanto al logo */
.logo-badge {
    background: rgba(255, 255, 255, 0.15);
    padding: 2px 12px;
    border-radius: var(--radius-full);
    font-size: 0.6rem;
    font-weight: 600;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    color: rgba(255,255,255,0.9);
    border: 1px solid rgba(255,255,255,0.1);
    backdrop-filter: blur(4px);
    margin-left: 4px;
    white-space: nowrap;
    font-family: var(--font-body);
}

/* ----- NAVIGAZIONE ----- */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.6rem;
    color: #fff;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.nav-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 4px;
    flex-wrap: wrap;
}

.nav-menu a {
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.92rem;
    transition: var(--transition);
    color: rgba(255, 255, 255, 0.85);
    letter-spacing: 0.3px;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--color-secondary-light);
    transition: var(--transition);
    border-radius: 2px;
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 60%;
}

.nav-menu a:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
}

.nav-menu a.active {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
}

/* ----- HERO (Stile Professionale con badge Open Source) ----- */
.hero {
    padding: 60px 0 40px;
    text-align: center;
    background: linear-gradient(145deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: #fff;
    border-radius: 0 0 var(--radius) var(--radius);
    margin-bottom: 24px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -40%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(74, 144, 226, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    right: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(74, 144, 226, 0.06) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero .container {
    position: relative;
    z-index: 2;
}

.hero h1 {
    font-family: var(--font-heading);
    font-size: 2.8rem;
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 12px;
}

.hero h1 i {
    color: var(--color-secondary-light);
}

.hero p {
    font-size: 1.15rem;
    opacity: 0.95;
    max-width: 700px;
    margin: 0 auto 20px;
    font-weight: 400;
}

.hero .badge-group {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
}

.hero .badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(8px);
    color: #fff;
    padding: 8px 24px;
    border-radius: var(--radius-full);
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    transition: var(--transition);
}

.hero .badge i {
    font-size: 0.9rem;
}

.hero .badge:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.hero .badge-primary {
    background: var(--color-secondary);
    border-color: var(--color-secondary);
}

/* ----- TOOLBAR (Filtri + Ricerca) ----- */
.toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin: 24px 0 32px;
    padding: 16px 24px;
    background: var(--color-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.toolbar:hover {
    box-shadow: var(--shadow-md);
}

.filter-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.filter-btn {
    padding: 8px 20px;
    border: 1.5px solid var(--color-border);
    background: transparent;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    color: var(--color-text-muted);
    font-family: var(--font-body);
    letter-spacing: 0.3px;
    text-transform: uppercase;
}

.filter-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: rgba(0, 51, 102, 0.04);
}

.filter-btn.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

.filter-btn.active:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
}

.search-box {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--color-bg);
    padding: 4px 16px 4px 20px;
    border-radius: var(--radius-full);
    border: 1.5px solid var(--color-border);
    transition: var(--transition);
    flex-shrink: 0;
}

.search-box:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(0, 51, 102, 0.08);
    background: var(--color-card);
}

.search-box input {
    border: none;
    background: transparent;
    padding: 9px 0;
    font-size: 0.92rem;
    outline: none;
    width: 180px;
    font-family: var(--font-body);
    color: var(--color-text);
}

.search-box input::placeholder {
    color: var(--color-text-muted);
}

.search-box button {
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    font-size: 1rem;
    padding: 6px 4px;
    transition: var(--transition);
}

.search-box button:hover {
    color: var(--color-primary);
}

/* ----- GRIGLIA NOTIZIE (migliorata) ----- */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.news-card {
    background: var(--color-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    border: 1px solid var(--color-border);
    position: relative;
}

.news-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary-light);
}

/* Effetto glow all'hover */
.news-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary-light));
    opacity: 0;
    transition: var(--transition);
}

.news-card:hover::before {
    opacity: 1;
}

.news-card-image {
    height: 180px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 3.5rem;
    background: linear-gradient(145deg, var(--color-primary-dark), var(--color-primary));
    background-size: cover;
    background-position: center;
    overflow: hidden;
}

/* Overlay sottile sull'immagine */
.news-card-image::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(0deg, rgba(0,0,0,0.1) 0%, transparent 60%);
    pointer-events: none;
}

.news-card-image .cat-tag {
    position: absolute;
    top: 12px;
    left: 12px;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(8px);
    padding: 4px 14px;
    border-radius: var(--radius-full);
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.08);
    z-index: 2;
}

.news-card-image .card-icon {
    opacity: 0.25;
    font-size: 4.5rem;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    z-index: 1;
}

.news-card-body {
    padding: 20px 24px 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.news-card-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.news-card-meta i {
    margin-right: 4px;
    color: var(--color-primary);
    font-size: 0.7rem;
}

.news-card-title {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 10px;
}

.news-card-title a {
    color: var(--color-text);
    transition: var(--transition);
}

.news-card-title a:hover {
    color: var(--color-primary);
}

.news-card-excerpt {
    color: var(--color-text-muted);
    font-size: 0.92rem;
    flex: 1;
    margin-bottom: 16px;
    line-height: 1.6;
}

.news-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-top: 1px solid var(--color-border);
    padding-top: 16px;
    margin-top: auto;
}

.news-card-footer .read-more {
    font-weight: 600;
    font-size: 0.85rem;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--color-primary);
    transition: var(--transition);
}

.news-card-footer .read-more i {
    transition: var(--transition);
    font-size: 0.8rem;
}

.news-card-footer .read-more:hover {
    color: var(--color-primary-dark);
}

.news-card-footer .read-more:hover i {
    transform: translateX(4px);
}

.news-card-footer .source {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    opacity: 0.6;
}

/* Stato vuoto */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--color-text-muted);
    grid-column: 1 / -1;
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: 0.3;
}

/* ----- SEZIONI PREVIEW (Temi, Risorse, Chi siamo) con sfondi differenziati ----- */
.section-preview {
    border-radius: var(--radius);
    padding: 28px 24px;
    margin: 32px 0 24px;
    box-shadow: var(--shadow-sm);
    border-left: 5px solid var(--color-primary);
    transition: var(--transition);
    background: var(--color-card);
    position: relative;
    overflow: hidden;
}

/* Sfondo leggermente diverso per ogni sezione */
.section-preview:nth-of-type(1) {
    border-left-color: #4a90e2;
    background: linear-gradient(135deg, #ffffff 0%, #f0f7ff 100%);
}

.section-preview:nth-of-type(2) {
    border-left-color: #34a853;
    background: linear-gradient(135deg, #ffffff 0%, #f0fff4 100%);
}

.section-preview:nth-of-type(3) {
    border-left-color: #ea4335;
    background: linear-gradient(135deg, #ffffff 0%, #fff5f3 100%);
}

.section-preview:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.section-preview h2 {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--color-primary);
}

.section-preview h2 i {
    color: var(--color-secondary-light);
}

.section-preview p {
    color: var(--color-text-muted);
    margin-bottom: 12px;
}

.chip-group {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 4px;
}

.chip-group .chip {
    background: var(--color-bg);
    padding: 6px 18px;
    border-radius: var(--radius-full);
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
    transition: var(--transition);
    cursor: default;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.chip-group .chip i {
    color: var(--color-primary);
    transition: var(--transition);
    font-size: 0.75rem;
}

.chip-group .chip:hover {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.chip-group .chip:hover i {
    color: #fff;
}

/* ----- ARTICOLO (Dettaglio) migliorato ----- */
.article-content {
    max-width: 800px;
    margin: 40px auto;
    background: var(--color-card);
    padding: 48px 52px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    line-height: 1.8;
    border: 1px solid var(--color-border);
}

.article-content h1 {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--color-primary);
}

.article-content .meta {
    color: var(--color-text-muted);
    font-size: 0.85rem;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-border);
}

.article-content .meta i {
    margin-right: 6px;
}

.article-content img {
    max-width: 100%;
    border-radius: var(--radius-sm);
    margin: 24px 0;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.article-content ul,
.article-content ol {
    padding-left: 24px;
    margin: 16px 0;
}

.article-content li {
    margin-bottom: 8px;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: 24px 0 16px;
    font-weight: 600;
    color: var(--color-primary);
    transition: var(--transition);
}

.back-link i {
    transition: var(--transition);
}

.back-link:hover {
    color: var(--color-primary-dark);
}

.back-link:hover i {
    transform: translateX(-4px);
}

/* ----- FOOTER (migliorato) ----- */
.site-footer {
    background: var(--color-primary-dark);
    color: rgba(255, 255, 255, 0.85);
    padding: 48px 0 24px;
    margin-top: 40px;
    border-top: 3px solid var(--color-secondary);
}

.footer-inner {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
}

.footer-col h4 {
    font-family: var(--font-heading);
    color: #fff;
    font-weight: 600;
    margin-bottom: 14px;
    font-size: 1rem;
    letter-spacing: 0.5px;
}

.footer-col h4 i {
    margin-right: 8px;
    color: var(--color-secondary-light);
}

.footer-col p,
.footer-col a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    line-height: 1.7;
}

.footer-col a:hover {
    color: var(--color-secondary-light);
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 6px;
}

.footer-col ul li a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.footer-col ul li a:hover {
    transform: translateX(4px);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 20px;
    margin-top: 32px;
    text-align: center;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.4);
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.6);
    transition: var(--transition);
}

.footer-bottom a:hover {
    color: #fff;
}

/* ----- RESPONSIVE (migliorato) ----- */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }
    
    .nav-menu {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        padding: 12px 0 8px;
        gap: 4px;
    }
    
    .nav-menu.open {
        display: flex;
    }
    
    .nav-menu a {
        padding: 12px 16px;
        border-radius: var(--radius-sm);
        text-align: center;
        color: #fff;
        background: rgba(255, 255, 255, 0.04);
    }
    
    .nav-menu a::after {
        display: none;
    }
    
    .nav-menu a:hover {
        background: rgba(255, 255, 255, 0.1);
    }
    
    .nav-menu a.active {
        background: rgba(255, 255, 255, 0.15);
    }
    
    .logo {
        font-size: 1.5rem;
        min-height: 40px;
    }
    
    .logo-img {
        height: 1.3em;
        max-height: 40px;
    }
    
    .logo-badge {
        display: none;
    }
    
    .hero h1 {
        font-size: 2.2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .toolbar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-group {
        justify-content: center;
    }
    
    .search-box input {
        width: 100%;
    }
    
    .search-box {
        width: 100%;
    }
    
    .footer-inner {
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }
    
    .article-content {
        padding: 28px 20px;
        margin: 24px auto;
    }
    
    .section-preview {
        padding: 20px 16px;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 1.2rem;
        min-height: 36px;
    }
    
    .logo-img {
        height: 1.2em;
        max-height: 32px;
    }
    
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .hero .badge {
        font-size: 0.7rem;
        padding: 6px 16px;
    }
    
    .footer-inner {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .news-card-image {
        height: 150px;
    }
    
    .news-card-body {
        padding: 16px;
    }
    
    .article-content {
        padding: 16px;
        margin: 16px auto;
    }
    
    .article-content h1 {
        font-size: 1.6rem;
    }
}

/* ----- UTILITY ----- */
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; }
.mb-8 { margin-bottom: 8px; }
.mt-16 { margin-top: 16px; }
.mb-16 { margin-bottom: 16px; }


/* RSS Link Styling */
.rss-link {
    color: #ff6600;
    font-size: 1.2rem;
    margin-left: 1rem;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.rss-link:hover {
    color: #ff8c42;
    text-decoration: underline;
}