/*

    ================================================
    LIBRERIE.CSS - BOOKSNAP LANDING PAGE PER PARTNER
    ================================================

    INDICE:
    1.  Impostazioni Globali e Variabili
    2.  Reset Moderno e Stili Base
    3.  Sistema di Layout e Container
    4.  Componenti UI (Pulsanti, Link)
    5.  Header e Navigazione Desktop
    6.  MENU MOBILE
    7.  Sezioni della Pagina (Hero, Why, How, FAQ, Founder, CTA, Partner Form)
    8.  Footer
    9.  Animazioni e Utility
    10. Media Queries e Responsive Design

*/


/* 1. IMPOSTAZIONI GLOBALI E VARIABILI
---------------------------------------------------- */
:root {
    --color-primary: #0f766e; /* Teal 700 */
    --color-primary-light: #0d9488; /* Teal 600 */
    --color-primary-dark: #134e4a; /* Teal 900 */
    --color-secondary: #f0fdfa; /* Teal 50 */
    --color-text: #475569; /* Slate 600 */
    --color-heading: #1e293b; /* Slate 800 */
    --color-background: #ffffff;
    --color-border: #e2e8f0; /* Slate 200 */
    
    --font-primary: 'Plus Jakarta Sans', sans-serif;
    --font-secondary: 'Merriweather', serif;
    
    --border-radius-md: 8px;
    --border-radius-lg: 16px;

    --shadow-md: 0 4px 10px -2px rgb(0 0 0 / 0.07);
    --shadow-lg: 0 10px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}


/* 2. RESET MODERNO E STILI BASE
---------------------------------------------------- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-primary);
    color: var(--color-text);
    background-color: var(--color-background);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

body.no-scroll {
    overflow: hidden;
}

::selection {
    background-color: var(--color-primary);
    color: white;
}

h1, h2, h3, h4 {
    font-family: var(--font-secondary);
    color: var(--color-heading);
    line-height: 1.3;
}

h1 { font-size: clamp(2.5rem, 5vw, 3.75rem); }
h2 { font-size: clamp(2rem, 4vw, 2.75rem); }
p { max-width: 65ch; }
img { max-width: 100%; height: auto; display: block; }

:focus-visible {
    outline: 3px solid var(--color-primary-light);
    outline-offset: 2px;
    border-radius: var(--border-radius-md);
}


/* 3. SISTEMA DI LAYOUT E CONTAINER
---------------------------------------------------- */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}


/* 4. COMPONENTI UI (PULSANTI, LINK)
---------------------------------------------------- */
.cta-button {
    display: inline-flex; /* Usiamo flex per centrare il loader */
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: var(--border-radius-md);
    text-decoration: none;
    font-weight: 700;
    transition: var(--transition-smooth);
    border: 2px solid transparent;
    cursor: pointer;
    text-align: center;
}
.cta-button.primary {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}
.cta-button.primary:hover {
    background-color: var(--color-primary-light);
    border-color: var(--color-primary-light);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}
.cta-button.large {
    padding: 16px 36px;
    font-size: 1.1rem;
}
.cta-button.inverted {
    background-color: white;
    color: var(--color-primary-dark);
    border-color: white;
}
.cta-button.inverted:hover {
    background-color: var(--color-background);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.link-arrow {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 700;
    transition: var(--transition-smooth);
}
.link-arrow:hover {
    text-decoration: underline;
    opacity: 0.8;
}


/* 5. HEADER E NAVIGAZIONE DESKTOP
---------------------------------------------------- */
.header {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 900;
    transition: var(--transition-smooth);
}
.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}
.logo {
    font-family: var(--font-secondary);
    font-weight: 800;
    font-size: 18px;
    color: var(--color-primary-dark);
    text-decoration: none;
    transition: var(--transition-smooth);
    display: flex;
    align-items: center;
    gap: 8px;
}
.logo:hover {
    opacity: 0.8;
}

.logo small {
    font-size: 14px;
    font-weight: 500;
    opacity: 0.8;
}

.header-logo-img {
    height: 36px;
    width: auto;
}

.footer-logo {
    color: white;
}

.footer-logo-img {
    height: 28px;
    width: auto;
    filter: brightness(0) invert(1);
}
.main-nav {
    display: none;
}
.main-nav ul {
    display: flex;
    list-style: none;
    gap: 32px;
}
.main-nav a {
    text-decoration: none;
    color: var(--color-text);
    font-weight: 500;
    transition: var(--transition-smooth);
    position: relative;
    padding: 4px 0;
}
.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-smooth);
}
.main-nav a:hover {
    color: var(--color-heading);
}
.main-nav a:hover::after {
    width: 100%;
}
.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}
.language-switcher {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 4px;
    background: rgba(255, 255, 255, 0.7);
    border-radius: 999px;
    border: 1px solid var(--color-border);
}
.lang-toggle {
    border: none;
    background: transparent;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--color-text);
    padding: 6px 12px;
    border-radius: 999px;
    cursor: pointer;
    transition: var(--transition-smooth);
}
.lang-toggle:hover {
    color: var(--color-heading);
    background: rgba(15, 118, 110, 0.08);
}
.lang-toggle.active {
    background: var(--color-primary);
    color: white;
    box-shadow: 0 6px 16px -6px rgba(15, 118, 110, 0.6);
}
.header-actions .cta-button {
    display: none;
}


/* 6. MENU MOBILE
---------------------------------------------------- */
.mobile-nav-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}
.hamburger-icon {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-heading);
    position: relative;
    transition: background-color 0.15s linear;
}
.hamburger-icon::before, .hamburger-icon::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background-color: var(--color-heading);
    left: 0;
    transition: transform 0.3s ease, top 0.3s ease;
}
.hamburger-icon::before { top: -8px; }
.hamburger-icon::after { top: 8px; }

.mobile-nav-toggle.active .hamburger-icon {
    background-color: transparent;
}
.mobile-nav-toggle.active .hamburger-icon::before {
    transform: rotate(45deg);
    top: 0;
}
.mobile-nav-toggle.active .hamburger-icon::after {
    transform: rotate(-45deg);
    top: 0;
}

.mobile-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-background);
    z-index: 1000;
    display: none; 
    opacity: 0;
    align-items: center;
    justify-content: center;
    transition: opacity var(--transition-smooth);
}
.mobile-nav-overlay.active {
    display: flex;
    opacity: 1;
}
.mobile-nav ul {
    list-style: none;
    text-align: center;
}
.mobile-nav ul li {
    transform: translateY(20px);
    opacity: 0;
    animation: menu-item-fade-in 0.4s ease forwards;
    margin-bottom: 32px;
}
.mobile-nav-overlay.active li:nth-child(1) { animation-delay: 0.1s; }
.mobile-nav-overlay.active li:nth-child(2) { animation-delay: 0.15s; }
.mobile-nav-overlay.active li:nth-child(3) { animation-delay: 0.2s; }
.mobile-nav-overlay.active li:nth-child(4) { animation-delay: 0.25s; }
.mobile-nav-overlay.active li:nth-child(5) { animation-delay: 0.35s; }

.mobile-nav ul a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-heading);
    text-decoration: none;
    padding: 8px 16px;
}
.mobile-language-switcher {
    position: absolute;
    bottom: 48px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 12px;
    background: rgba(255, 255, 255, 0.85);
    border-radius: 999px;
    padding: 6px 10px;
    border: 1px solid var(--color-border);
}
.mobile-language-switcher .lang-toggle {
    font-size: 1rem;
}

@keyframes menu-item-fade-in {
    to {
        transform: translateY(0);
        opacity: 1;
    }
}


/* 7. SEZIONI DELLA PAGINA
---------------------------------------------------- */
.hero-section, .why-section, .how-it-works-section, .faq-section, .founder-section, .cta-section, .partner-section {
    padding: 100px 0;
}

/* --- Hero --- */
.hero-section {
    background: linear-gradient(170deg, var(--color-secondary) 0%, var(--color-background) 100%);
}
.hero-section .container {
    display: flex;
    align-items: center;
    gap: 64px;
}
.hero-content { flex: 1; }
.hero-subtitle {
    display: block;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 16px;
}
.hero-content p {
    font-size: 1.1rem;
    margin: 24px 0 40px;
}
.hero-actions {
    display: flex;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
}
.hero-image { flex: 1; display: none; }
.hero-image img {
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
}

/* --- Vantaggi (Why) --- */
.why-section {
    background-color: var(--color-secondary);
}
.why-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}
.why-card {
    background: white;
    padding: 32px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-smooth);
    border: 1px solid var(--color-border);
}
.why-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}
.why-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius-md);
    background: var(--color-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}
.why-card h3 {
    margin-bottom: 12px;
    font-size: 1.3rem;
}

/* --- Come Funziona --- */
.step-item {
    display: flex;
    align-items: center;
    gap: 64px;
    margin-bottom: 80px;
}
.step-item:last-child { margin-bottom: 0; }
.step-item:nth-child(even) { flex-direction: row-reverse; }
.step-content { flex: 1; }
.step-image { flex: 1; }
.step-image img {
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
}
.step-number {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-primary);
    background: var(--color-secondary);
    padding: 8px 16px;
    border-radius: var(--border-radius-md);
    display: inline-block;
    margin-bottom: 24px;
}
.step-content h3 {
    font-size: 2rem;
    margin-bottom: 16px;
}

/* --- FAQ --- */
.faq-section {
    background-color: #f8fafc; /* Slate 50 */
}
.faq-accordion {
    max-width: 800px;
    margin: 0 auto;
}
.faq-item {
    border-bottom: 1px solid var(--color-border);
}
.faq-question {
    width: 100%;
    background: none;
    border: none;
    text-align: left;
    padding: 24px 8px;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-heading);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: var(--transition-smooth);
}
.faq-question:hover {
    background-color: white;
}
.faq-icon {
    transition: transform var(--transition-smooth);
    flex-shrink: 0;
    margin-left: 16px;
}
.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
    color: var(--color-primary);
}
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s cubic-bezier(0.2, 1, 0.2, 1);
}
.faq-answer p {
    padding: 0 8px 24px 8px;
}

/* --- Sezione Visione (Founder) --- */
.founder-section {
    background-color: var(--color-secondary);
}
.founder-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}
.founder-image {
    margin-bottom: 32px;
}
.founder-image img {
    width: 180px; /* Più piccolo per un tocco più sobrio */
    border-radius: 50%;
    box-shadow: var(--shadow-lg);
    border: 4px solid white;
}
.founder-text .section-tag {
    margin-bottom: 8px;
}
.founder-text h3 {
    font-size: 2rem;
    margin-bottom: 16px;
}
.founder-quote {
    font-family: var(--font-secondary);
    font-style: italic;
    font-size: 1.25rem;
    line-height: 1.8;
    color: var(--color-heading);
}

/* --- Sezione Form Partner --- */
.partner-section {
    background-color: var(--color-background);
}
.partner-form {
    max-width: 800px;
    margin: 40px auto 0;
    padding: 48px;
    border-radius: var(--border-radius-lg);
    background: white;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
}
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 24px;
}
.form-group {
    display: flex;
    flex-direction: column;
}
.form-group.full-width {
    grid-column: 1 / -1;
}
.form-group label {
    font-weight: 500;
    color: var(--color-heading);
    margin-bottom: 8px;
    font-size: 0.9rem;
}
.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: var(--transition-smooth);
}
.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.1);
}
.form-group textarea {
    resize: vertical;
    min-height: 120px;
}
.form-footer {
    text-align: center;
    margin-top: 32px;
}
.form-feedback {
    margin-top: 16px;
    font-weight: 500;
    min-height: 24px;
    transition: var(--transition-smooth);
}
.form-feedback.success { color: var(--color-primary); }
.form-feedback.error { color: #dc2626; }

/* Loader per pulsante */
.cta-button .button-loader {
    display: none;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.5);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}
.cta-button.loading .button-text { display: none; }
.cta-button.loading .button-loader { display: block; }

@keyframes spin { to { transform: rotate(360deg); } }


/* 8. FOOTER
---------------------------------------------------- */
.footer {
    background: var(--color-heading);
    color: var(--color-border);
    padding: 80px 0 0;
}
.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 64px;
}
.footer-about p {
    color: #94a3b8;
    margin-top: 16px;
}
.footer-links h4 {
    color: white;
    margin-bottom: 16px;
    font-family: var(--font-primary);
    font-weight: 700;
}
.footer-links ul { list-style: none; }
.footer-links li { margin-bottom: 12px; }
.footer-links a {
    text-decoration: none;
    color: #94a3b8;
    transition: var(--transition-smooth);
}
.footer-links a:hover {
    color: white;
    padding-left: 4px;
}
.footer-social {
    display: flex;
    gap: 16px;
}
.footer-social a {
    color: #94a3b8;
    transition: var(--transition-smooth);
}
.footer-social a:hover {
    color: white;
    transform: scale(1.1);
}
.footer-bottom {
    border-top: 1px solid #334155;
    padding: 24px 0;
    text-align: center;
    color: #94a3b8;
    font-size: 0.9rem;
}


/* 9. ANIMAZIONI E UTILITY
---------------------------------------------------- */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}
.section-header {
    text-align: center;
    margin-bottom: 64px;
}
.section-tag {
    display: inline-block;
    background-color: var(--color-secondary);
    color: var(--color-primary);
    padding: 6px 14px;
    border-radius: 99px;
    font-weight: 700;
    margin-bottom: 16px;
    font-size: 0.9rem;
}
.section-header h2 { margin-bottom: 16px; }
.section-header p { margin: 0 auto; color: var(--color-text); }


/* 10. MEDIA QUERIES E RESPONSIVE DESIGN
---------------------------------------------------- */
@media (min-width: 992px) {
    .main-nav { display: block; }
    .header-actions .cta-button { display: inline-block; }
    .mobile-nav-toggle { display: none; }
    .hero-image { display: block; }
}

@media (max-width: 991px) {
    .hero-section .container {
        flex-direction: column;
        text-align: center;
    }
    .hero-image {
        display: block;
        margin-top: 48px;
    }
    .hero-actions {
        justify-content: center;
    }
    .step-item,
    .step-item:nth-child(even) {
        flex-direction: column;
        text-align: center;
    }
    .step-image {
        order: -1;
        margin-bottom: 24px;
    }
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .footer-about,
    .footer-links {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    .footer-social {
        justify-content: center;
    }
}

@media (max-width: 767px) {
    .why-grid, .form-grid {
        grid-template-columns: 1fr;
    }
    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }
    .partner-form {
        padding: 32px 24px;
    }
}


/* Nuove sezioni aggiunte */
.problem-section {
    padding: 100px 0;
    background-color: #f8fafc;
}

.problem-highlight {
    max-width: 800px;
    margin: 48px auto 0;
    text-align: center;
}

.problem-highlight blockquote {
    font-family: var(--font-secondary);
    font-size: 1.5rem;
    font-style: italic;
    color: var(--color-primary);
    border-left: 4px solid var(--color-primary);
    padding-left: 24px;
    margin: 0;
}

.solution-section {
    padding: 100px 0;
    background-color: var(--color-background);
}

.solution-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    margin-top: 48px;
}

.solution-card {
    background: white;
    padding: 32px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-smooth);
    border: 1px solid var(--color-border);
    text-align: center;
}

.solution-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.solution-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--border-radius-md);
    background: var(--color-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 1.5rem;
}

.solution-card h3 {
    margin-bottom: 16px;
    font-size: 1.5rem;
}

/* Responsive updates */
@media (max-width: 767px) {
    .solution-grid {
        grid-template-columns: 1fr;
    }
    
    .problem-highlight blockquote {
        font-size: 1.2rem;
        padding-left: 16px;
    }
}