:root {
    --color-navy: #1a1d3a;
    --color-navy-light: #252a4d;
    --color-navy-dark: #0f1123;
    --color-digital-lab: #00b5b5;
    --color-trd-unit: #8b60bd;
    --color-media-house: #E88D00;
    --color-green: #009246;
    --color-white: #f1c40f;
    --color-red: #ce2b37;
    --color-text-primary: #ffffff;
    --color-text-secondary: rgba(255, 255, 255, 0.7);
    --color-text-tertiary: rgba(255, 255, 255, 0.5);
    --gradient-primary: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-light) 100%);
    --gradient-card: linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.02) 100%);
    --gradient-accent: linear-gradient(135deg, var(--color-digital-lab), var(--color-trd-unit));
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 20px rgba(255, 255, 255, 0.1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--color-navy-dark);
    color: var(--color-text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

.background-pattern {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('poly-l.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0.3;
    z-index: 0;
    pointer-events: none;
}

.background-pattern::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, transparent 0%, var(--color-navy-dark) 100%);
}

.container {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    animation: fadeInDown 0.8s ease-out;
}

.logo-container {
    margin-bottom: var(--spacing-md);
    animation: scaleIn 0.6s ease-out 0.2s backwards;
}

.logo {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    border: 4px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-sm);
    background: var(--gradient-card);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.logo:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(255, 255, 255, 0.2);
}

.title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-white) 0%, var(--color-digital-lab) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.05em;
    animation: fadeIn 0.8s ease-out 0.3s backwards;
}

.subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    font-weight: 400;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
    animation: fadeIn 0.8s ease-out 0.4s backwards;
}

.search-container {
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.8s ease-out 0.5s backwards;
}

.search-box {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
}

.search-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    color: var(--color-text-tertiary);
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) 3.5rem;
    background: var(--gradient-card);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
}

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

.search-input:focus {
    outline: none;
    border-color: var(--color-digital-lab);
    box-shadow: 0 0 0 3px rgba(0, 181, 181, 0.1), var(--shadow-md);
}

.filter-container {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    justify-content: center;
    animation: fadeInUp 0.8s ease-out 0.6s backwards;
}

.filter-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--gradient-card);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.filter-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-accent);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: -1;
}

.filter-btn:hover::before {
    left: 0;
    opacity: 0.1;
}

.filter-btn:hover {
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.2);
    color: var(--color-text-primary);
}

.filter-btn.active {
    background: var(--gradient-accent);
    border-color: var(--color-digital-lab);
    color: var(--color-white);
    box-shadow: 0 0 20px rgba(0, 181, 181, 0.3);
}

.filter-icon {
    font-size: 1.2rem;
}

.documents-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.8s ease-out 0.7s backwards;
}

.document-card {
    background: var(--gradient-card);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    position: relative;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    text-decoration: none;
    color: inherit;
    cursor: pointer;
}

.document-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.document-card:hover::before {
    transform: scaleX(1);
}

.document-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.05), transparent);
    transition: left 0.6s ease;
}

.document-card:hover::after {
    left: 100%;
}

.document-card:hover {
    transform: translateY(-8px);
    border-color: rgba(0, 181, 181, 0.3);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(0, 181, 181, 0.2);
}

.document-content {
    flex: 1;
}

.document-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
    line-height: 1.3;
}

.document-description {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
    margin-bottom: var(--spacing-md);
}

.document-meta {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    align-items: center;
}

.document-category {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: rgba(0, 181, 181, 0.2);
    border: 1px solid rgba(0, 181, 181, 0.3);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-digital-lab);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Livelli (basso/medio/alto) */
.document-card[data-level="basso"] { border-left: 4px solid var(--level-low); }
.document-card[data-level="medio"]  { border-left: 4px solid var(--level-mid); }
.document-card[data-level="alto"]   { border-left: 4px solid var(--level-high); }

.document-level-badge {
    display: inline-block;
    padding: 0.18rem 0.5rem;
    border-radius: 6px;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: capitalize;
}

.document-card[data-level="basso"] .document-level-badge { background: var(--level-low); color: #ffffff; }
.document-card[data-level="medio"]  .document-level-badge { background: var(--level-mid); color: #000000; }
.document-card[data-level="alto"]   .document-level-badge { background: var(--level-high); color: #ffffff; }

.legend {
    margin-bottom: 1rem;
    padding: 0.75rem 1rem;
    background: rgba(255,255,255,0.02);
    border: 1px solid rgba(255,255,255,0.03);
    border-radius: 8px;
}
.legend h4 { margin-bottom: 0.5rem; font-size: 0.95rem; }
.legend-list { list-style: none; display:flex; gap:1rem; align-items:center; margin-bottom:0.5rem; }
.legend-list li { display:flex; gap:0.5rem; align-items:center; color:var(--color-text-secondary); font-size:0.9rem; }
.legend-badge { width:14px; height:14px; border-radius:4px; display:inline-block; }
.legend-note { font-size:0.8rem; color:var(--color-text-tertiary); }

.document-date {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.empty-state {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    animation: fadeIn 0.5s ease-out;
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.empty-state p {
    color: var(--color-text-secondary);
    font-size: 1rem;
}

.footer {
    text-align: center;
    padding: var(--spacing-lg) 0;
    color: var(--color-text-tertiary);
    font-size: 0.875rem;
    margin-top: auto;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-links {
    margin-top: var(--spacing-xs);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.footer-links a {
    color: var(--color-digital-lab);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--color-white);
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

@media (max-width: 1024px) {
    .documents-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md) var(--spacing-sm);
    }

    .title {
        font-size: 2.5rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .logo {
        width: 80px;
        height: 80px;
    }

    .documents-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .filter-container {
        gap: var(--spacing-xs);
    }

    .filter-btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    .title {
        font-size: 2rem;
    }

    .document-card {
        padding: var(--spacing-md);
    }
}

html {
    scroll-behavior: smooth;
}

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

::-moz-selection {
    background: var(--color-digital-lab);
    color: var(--color-white);
}

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--color-navy-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-accent);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-digital-lab);
}