/* ============================================
   Marengo Studio - Premium Design System
   Ultra Professional • Fluid • Modern
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* ============================================
   CSS Variables
   ============================================ */

:root {
    /* Brand Colors */
    --brand-dark: #2C3442;
    --brand-text-light: #E6E9EE;
    --brand-secondary: #7A869A;
    --brand-secondary-dark: #3A4556;
    
    /* UI Colors */
    --color-bg-light: #F6F7F8;
    --color-bg-white: #FFFFFF;
    --color-text-dark: #1F2632;
    --color-text-body: #475569;
    --color-text-muted: #64748b;
    
    /* Borders */
    --color-border: #E2E8F0;
    --color-border-light: #F1F5F9;
    
    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(44, 52, 66, 0.04);
    --shadow-sm: 0 2px 4px rgba(44, 52, 66, 0.06), 0 1px 2px rgba(44, 52, 66, 0.04);
    --shadow-md: 0 4px 8px rgba(44, 52, 66, 0.08), 0 2px 4px rgba(44, 52, 66, 0.06);
    --shadow-lg: 0 8px 16px rgba(44, 52, 66, 0.1), 0 4px 8px rgba(44, 52, 66, 0.08);
    --shadow-xl: 0 16px 32px rgba(44, 52, 66, 0.12), 0 8px 16px rgba(44, 52, 66, 0.1);
    --shadow-2xl: 0 24px 48px rgba(44, 52, 66, 0.15), 0 12px 24px rgba(44, 52, 66, 0.12);
    
    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.5rem;
    --space-6: 2rem;
    --space-8: 3rem;
    --space-10: 4rem;
    --space-12: 6rem;
    --space-16: 8rem;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-2xl: 2rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 450ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* ============================================
   Base Reset
   ============================================ */

html, body, div, span, h1, h2, h3, h4, h5, h6, p, a, img, ul, li, header, footer, nav, section, article {
    margin: 0;
    padding: 0;
    border: 0;
    box-sizing: border-box;
}

html {
    overflow-x: hidden;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text-body);
    background-color: var(--color-bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

::selection {
    background-color: rgba(122, 134, 154, 0.2);
    color: var(--brand-dark);
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-sans);
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: -0.02em;
    color: var(--color-text-dark);
    margin-bottom: 1rem;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.03em;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 600;
}

p {
    margin-bottom: 1.25rem;
    line-height: 1.8;
}

.lead {
    font-size: 1.25rem;
    line-height: 1.7;
    color: var(--brand-secondary);
}

a {
    color: var(--brand-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

strong {
    font-weight: 600;
    color: var(--color-text-dark);
}

/* ============================================
   Layout
   ============================================ */

.container {
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-6);
    padding-right: var(--space-6);
}

/* ============================================
   Header - ULTRA PREMIUM
   ============================================ */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    /* Distanza dal bordo superiore */
    padding-top: 1.25rem;
    transition: padding-top var(--transition-base);
}

.site-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: calc(100% + 1.25rem);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border-bottom: 1px solid var(--color-border-light);
    transition: all var(--transition-base);
}

.site-header.scrolled {
    padding-top: 0;
}

.site-header.scrolled::before {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 4px 24px rgba(44, 52, 66, 0.06);
}

.header-content {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    transition: height var(--transition-base);
}

.site-header.scrolled .header-content {
    height: 64px;
}

/* Logo - Two Lines Premium */
.site-logo {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    line-height: 1;
    text-decoration: none;
    transition: all var(--transition-smooth);
    position: relative;
    padding: 0.25rem 0;
}

.site-logo::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--brand-dark) 0%, var(--brand-secondary) 100%);
    transition: width var(--transition-smooth);
}

.site-logo:hover::after {
    width: 100%;
}

.site-logo:hover {
    transform: translateY(-2px);
}

.logo-main {
    font-size: 1.625rem;
    font-weight: 700;
    color: var(--brand-dark);
    letter-spacing: -0.01em;
    transition: color var(--transition-fast);
}

.logo-studio {
    font-size: 1.125rem;
    font-weight: 400;
    color: var(--brand-secondary);
    letter-spacing: 0.02em;
    margin-top: -0.125rem;
    transition: color var(--transition-fast);
}

.site-logo:hover .logo-main {
    color: var(--brand-secondary-dark);
}

.site-logo:hover .logo-studio {
    color: var(--brand-dark);
}

/* Navigation - Premium */
.site-nav {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.nav-link {
    position: relative;
    padding: 0.75rem 1.25rem;
    color: var(--color-text-body);
    font-weight: 500;
    font-size: 0.9375rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-bg-light) 0%, rgba(242, 244, 246, 0.5) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
    border-radius: var(--radius-md);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0.75rem;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--brand-secondary);
    transform: translateX(-50%);
    transition: width var(--transition-base);
}

.nav-link > span {
    position: relative;
    z-index: 1;
}

.nav-link:hover {
    color: var(--brand-dark);
    transform: translateY(-1px);
}

.nav-link:hover::before {
    opacity: 1;
}

.nav-link:hover::after {
    width: calc(100% - 2rem);
}

.nav-link.active {
    color: var(--brand-dark);
    font-weight: 600;
}

.nav-link.active::before {
    opacity: 1;
}

.nav-link.active::after {
    width: calc(100% - 2rem);
}

/* Login Button - Ultra Premium */
.nav-link-login {
    position: relative;
    padding: 0.75rem 2rem;
    margin-left: 0.75rem;
    background: var(--brand-dark);
    color: white;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 0.9375rem;
    border: 2px solid var(--brand-dark);
    transition: all var(--transition-smooth);
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(44, 52, 66, 0.15);
}

.nav-link-login::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--brand-secondary-dark) 0%, var(--brand-secondary) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.nav-link-login > span {
    position: relative;
    z-index: 1;
}

.nav-link-login:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(44, 52, 66, 0.25);
}

.nav-link-login:hover::before {
    opacity: 1;
}

.nav-link-login:active {
    transform: translateY(-1px);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    background: var(--color-bg-white);
    border: 2px solid var(--color-border);
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.mobile-menu-toggle::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--brand-dark);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.mobile-menu-toggle:hover {
    border-color: var(--brand-secondary);
    box-shadow: var(--shadow-md);
}

.mobile-menu-toggle:hover::before {
    opacity: 1;
}

.mobile-menu-icon {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: 5px;
    transition: all var(--transition-base);
}

.mobile-menu-icon span {
    display: block;
    width: 24px;
    height: 2.5px;
    background: var(--brand-dark);
    transition: all var(--transition-base);
    border-radius: 2px;
}

.mobile-menu-toggle:hover .mobile-menu-icon span {
    background: white;
}

.mobile-menu-toggle.open .mobile-menu-icon span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.mobile-menu-toggle.open .mobile-menu-icon span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.open .mobile-menu-icon span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    padding-top: 8rem;
    padding-bottom: 6rem;
    background: linear-gradient(180deg, #FFFFFF 0%, var(--color-bg-light) 100%);
}

.hero-content {
    max-width: 800px;
    animation: heroFadeIn 0.8s ease-out;
}

@keyframes heroFadeIn {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    margin-bottom: var(--space-6);
    color: var(--brand-dark);
}

.hero-description {
    font-size: 1.25rem;
    line-height: 1.7;
    color: var(--brand-secondary);
    margin-bottom: var(--space-8);
    max-width: 680px;
}

.hero-cta {
    display: inline-flex;
    gap: var(--space-4);
    flex-wrap: wrap;
}

/* ============================================
   Sections
   ============================================ */

.section {
    padding-top: var(--space-16);
    padding-bottom: var(--space-16);
}

.section-header {
    max-width: 800px;
    margin-bottom: var(--space-12);
}

.section-title {
    margin-bottom: var(--space-4);
    color: var(--brand-dark);
}

.section-description {
    font-size: 1.125rem;
    line-height: 1.7;
    color: var(--brand-secondary);
}

/* ============================================
   Cards - ULTRA PREMIUM
   ============================================ */

.grid {
    display: grid;
    gap: var(--space-8);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.card {
    position: relative;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    transition: all var(--transition-smooth);
    box-shadow: var(--shadow-xs);
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(44, 52, 66, 0.01) 0%, rgba(122, 134, 154, 0.02) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.card::after {
    content: '';
    position: absolute;
    inset: -1px;
    background: linear-gradient(135deg, var(--brand-secondary) 0%, var(--brand-dark) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
    border-radius: var(--radius-xl);
    z-index: -1;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-2xl);
}

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

.card:hover::after {
    opacity: 0.1;
}

.card > * {
    position: relative;
    z-index: 1;
}

.card-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--brand-dark) 0%, var(--brand-secondary-dark) 100%);
    color: white;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    margin-bottom: var(--space-5);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-bounce);
    position: relative;
    overflow: hidden;
}

.card-icon::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--brand-secondary) 0%, var(--brand-dark) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.card:hover .card-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: var(--shadow-lg);
}

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

.card-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-3);
    color: var(--brand-dark);
    transition: color var(--transition-fast);
}

.card:hover .card-title {
    color: var(--brand-secondary-dark);
}

.card-description {
    line-height: 1.7;
    color: var(--color-text-body);
    margin-bottom: var(--space-5);
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--brand-secondary);
    font-weight: 600;
    font-size: 0.9375rem;
    transition: gap var(--transition-base);
    position: relative;
}

.card-link::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--brand-dark);
    transition: width var(--transition-base);
}

.card-link:hover {
    color: var(--brand-dark);
    gap: var(--space-3);
}

.card-link:hover::before {
    width: calc(100% - 2rem);
}

.card-link::after {
    content: '→';
    transition: transform var(--transition-bounce);
}

.card-link:hover::after {
    transform: translateX(4px);
}

/* ============================================
   Project Cards
   ============================================ */

.project-card {
    position: relative;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-smooth);
    display: block;
    text-decoration: none;
    color: inherit;
    box-shadow: var(--shadow-sm);
}

.project-card::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: linear-gradient(135deg, var(--brand-secondary) 0%, var(--brand-dark) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
    border-radius: var(--radius-xl);
    z-index: -1;
    filter: blur(8px);
}

.project-card:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow-2xl);
    border-color: transparent;
}

.project-card:hover::before {
    opacity: 0.2;
}

.project-card-image {
    width: 100%;
    height: 280px;
    background: linear-gradient(135deg, var(--brand-dark) 0%, var(--brand-secondary-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    transition: transform var(--transition-smooth);
}

.project-card-image::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(122, 134, 154, 0.2) 0%, rgba(44, 52, 66, 0.2) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.project-card:hover .project-card-image {
    transform: scale(1.05);
}

.project-card:hover .project-card-image::before {
    opacity: 1;
}

.project-card-content {
    padding: var(--space-6);
}

.project-card-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-3);
    color: var(--brand-dark);
    transition: color var(--transition-fast);
}

.project-card:hover .project-card-title {
    color: var(--brand-secondary-dark);
}

.project-card-description {
    color: var(--color-text-body);
    margin-bottom: var(--space-5);
    line-height: 1.7;
}

.project-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.tag {
    padding: 0.375rem 0.875rem;
    background: var(--color-bg-light);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--brand-secondary);
    transition: all var(--transition-bounce);
    position: relative;
    overflow: hidden;
}

.tag::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--brand-dark) 0%, var(--brand-secondary) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.tag > * {
    position: relative;
    z-index: 1;
}

.tag:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: var(--shadow-md);
    border-color: transparent;
    color: white;
}

.tag:hover::before {
    opacity: 1;
}

/* ============================================
   Buttons - ULTRA PREMIUM
   ============================================ */

.btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 1rem 2rem;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-smooth);
    border: none;
    text-decoration: none;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.6s ease;
}

.btn:hover::before {
    left: 100%;
}

.btn > * {
    position: relative;
    z-index: 1;
}

.btn-primary {
    background: linear-gradient(135deg, var(--brand-dark) 0%, var(--brand-secondary-dark) 100%);
    color: white;
    border: 2px solid transparent;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.btn-primary:active {
    transform: translateY(-1px);
}

.btn-secondary {
    background: white;
    color: var(--brand-dark);
    border: 2px solid var(--color-border);
}

.btn-secondary::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-bg-light) 0%, white 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
    z-index: 0;
}

.btn-secondary:hover {
    border-color: var(--brand-secondary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary:hover::after {
    opacity: 1;
}

.btn-large {
    padding: 1.25rem 2.5rem;
    font-size: 1.0625rem;
}

/* ============================================
   Footer
   ============================================ */

.site-footer {
    background-color: var(--brand-dark);
    color: var(--brand-text-light);
    padding-top: var(--space-12);
    padding-bottom: var(--space-8);
    margin-top: var(--space-16);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-8);
    margin-bottom: var(--space-8);
}

.footer-section-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-4);
    color: var(--brand-text-light);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--space-2);
}

.footer-link {
    color: var(--brand-secondary);
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.9375rem;
}

.footer-link::before {
    content: '→';
    opacity: 0;
    transform: translateX(-8px);
    transition: all var(--transition-base);
}

.footer-link:hover {
    color: var(--brand-text-light);
    transform: translateX(4px);
}

.footer-link:hover::before {
    opacity: 1;
    transform: translateX(0);
}

.footer-bottom {
    padding-top: var(--space-6);
    border-top: 1px solid var(--brand-secondary-dark);
    text-align: center;
    color: var(--brand-secondary);
    font-size: 0.875rem;
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 768px) {
    :root {
        --space-16: 4rem;
        --space-12: 3rem;
    }
    
    h1 {
        font-size: 2.25rem;
    }
    
    .site-header {
        padding-top: 0.75rem;
    }
    
    .site-nav {
        display: none;
    }
    
    .site-nav.open {
        display: flex;
        position: fixed;
        top: calc(72px + 0.75rem);
        left: 1rem;
        right: 1rem;
        background: white;
        flex-direction: column;
        padding: var(--space-5);
        gap: 0.5rem;
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-2xl);
        border: 1px solid var(--color-border);
        animation: mobileNavSlide 0.3s ease-out;
    }
    
    @keyframes mobileNavSlide {
        from {
            opacity: 0;
            transform: translateY(-16px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
    
    .nav-link,
    .nav-link-login {
        width: 100%;
        text-align: center;
        margin-left: 0;
        justify-content: center;
    }
    
    .mobile-menu-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .hero {
        min-height: calc(100vh - 88px);
        padding-top: 6rem;
        padding-bottom: 4rem;
    }
    
    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
    }
    
    .container {
        padding-left: var(--space-4);
        padding-right: var(--space-4);
    }
}

/* ============================================
   Utilities
   ============================================ */

.text-center {
    text-align: center;
}

.mt-8 { margin-top: var(--space-8); }
.mb-8 { margin-bottom: var(--space-8); }

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.8s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}