/* Reset e variabili CSS */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #000000;
    --bg-secondary: #1a0000;
    --bg-container: #2a0000;
    --border-glow: #ff6b35;
    --border-pink: #ff6b35;
    --text-primary: #ffffff;
    --text-secondary: #f0f0f0;
    --accent-yellow: #ffd700;
    --accent-red: #ff4444;
    --accent-orange: #ff6b35;
    --accent-dark-red: #8b0000;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--accent-dark-red) 100%);
    min-height: 100vh;
    color: var(--text-primary);
    position: relative;
    overflow-x: hidden;
}

/* Particelle di sfondo animate */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(2px 2px at 20px 30px, var(--accent-yellow), transparent),
        radial-gradient(2px 2px at 40px 70px, var(--accent-red), transparent),
        radial-gradient(1px 1px at 90px 40px, var(--accent-orange), transparent),
        radial-gradient(1px 1px at 130px 80px, var(--accent-yellow), transparent);
    background-repeat: repeat;
    background-size: 200px 100px;
    animation: sparkle 20s linear infinite;
    opacity: 0.4;
    z-index: -1;
}

@keyframes sparkle {
    0% { transform: translateY(0px); }
    100% { transform: translateY(-100px); }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    margin-bottom: 40px;
    padding: 30px 0;
}

.header-content {
    display: flex;
    align-items: flex-start;
    gap: 30px;
    max-width: 100%;
}

.logo-container {
    flex-shrink: 0;
}

.logo {
    width: 350px;
    height: auto;
    transition: transform 0.3s ease;
    padding-top: 5px;
}

.logo:hover {
    transform: scale(1.05);
}

.title-container {
    flex: 1;
    text-align: left;
}

.title {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-yellow), var(--accent-red));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 15px;
    text-shadow: 0 0 30px rgba(255, 215, 0, 0.5);
    letter-spacing: 2px;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    opacity: 0.9;
    margin-bottom: 25px;
}

/* Spiegazione collassabile */
.explanation-toggle {
    margin-top: 20px;
}

.explanation-btn {
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.1), rgba(255, 107, 53, 0.1));
    border: 2px solid rgba(255, 215, 0, 0.3);
    border-radius: 15px;
    padding: 12px 20px;
    color: var(--accent-yellow);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    justify-content: center;
    backdrop-filter: blur(10px);
}

.explanation-btn:hover {
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.2), rgba(255, 107, 53, 0.2));
    border-color: var(--accent-yellow);
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(255, 215, 0, 0.2);
}

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

.explanation-arrow {
    font-size: 0.9rem;
    transition: transform 0.3s ease;
}

.explanation-btn.active .explanation-arrow {
    transform: rotate(180deg);
}

.explanation-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    margin-top: 15px;
}

.explanation-content.open {
    max-height: 800px;
}

.explanation-inner {
    background: rgba(42, 0, 0, 0.8);
    border: 2px solid rgba(255, 215, 0, 0.2);
    border-radius: 15px;
    padding: 25px;
    backdrop-filter: blur(10px);
}

.explanation-inner h3 {
    color: var(--accent-yellow);
    font-size: 1.1rem;
    margin-bottom: 15px;
    margin-top: 20px;
}

.explanation-inner h3:first-child {
    margin-top: 0;
}

.explanation-inner p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 15px;
}

.explanation-inner ul {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 20px;
    padding-left: 20px;
}

.explanation-inner li {
    margin-bottom: 8px;
}

.explanation-inner strong {
    color: var(--accent-orange);
}

/* Contenuto principale */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

/* Container input testo */
.text-input-container {
    position: relative;
    width: 100%;
}

.text-input {
    width: 100%;
    min-height: 200px;
    padding: 20px;
    background: var(--bg-container);
    border: 2px solid var(--border-pink);
    border-radius: 15px;
    color: var(--text-primary);
    font-size: 16px;
    line-height: 1.6;
    resize: vertical;
    box-shadow: 0 0 20px rgba(255, 107, 53, 0.3);
    transition: all 0.3s ease;
    position: relative;
    z-index: 2;
}

.text-input:focus {
    outline: none;
    border-color: var(--accent-red);
    box-shadow: 0 0 30px rgba(255, 68, 68, 0.4);
}

/* Overlay per caricamento file */
.file-upload-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(42, 0, 0, 0.95);
    border: 3px dashed var(--accent-orange);
    border-radius: 15px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 1;
    padding-bottom: 60px;
}

.file-upload-overlay:hover {
    background: rgba(42, 0, 0, 0.98);
    border-color: var(--accent-yellow);
    border-width: 4px;
    transform: scale(1.02);
    box-shadow: 0 0 30px rgba(255, 215, 0, 0.3);
}

.file-upload-overlay:hover .upload-button {
    transform: translateY(40px);
    margin-bottom: 60px;
    z-index: 10;
}

.upload-icon {
    font-size: 4rem;
    margin-bottom: 20px;
    opacity: 1;
    color: var(--accent-yellow);
    text-shadow: 0 0 20px rgba(255, 215, 0, 0.5);
}

.upload-text {
    font-size: 1.3rem;
    color: var(--accent-yellow);
    text-align: center;
    margin-bottom: 12px;
    font-weight: 600;
    text-shadow: 0 0 10px rgba(255, 215, 0, 0.3);
}

.upload-subtext {
    font-size: 1rem;
    color: var(--text-secondary);
    text-align: center;
    opacity: 0.9;
    background: rgba(255, 215, 0, 0.1);
    padding: 8px 16px;
    border-radius: 20px;
    border: 1px solid rgba(255, 215, 0, 0.3);
    margin-bottom: 20px;
}

.upload-button {
    background: linear-gradient(135deg, var(--accent-yellow), var(--accent-orange));
    border: none;
    border-radius: 25px;
    padding: 15px 30px;
    color: var(--bg-primary);
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 0 20px rgba(255, 215, 0, 0.4);
    text-transform: uppercase;
    letter-spacing: 1px;
    animation: pulse 2s ease-in-out infinite;
    margin-bottom: 30px;
}

.upload-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 30px rgba(255, 215, 0, 0.6);
    background: linear-gradient(135deg, var(--accent-orange), var(--accent-yellow));
}

.upload-button:active {
    transform: translateY(-1px);
}

.upload-btn-icon {
    font-size: 1.2rem;
}

/* Contatore caratteri */
.character-count {
    position: absolute;
    bottom: 15px;
    right: 20px;
    background: var(--accent-red);
    color: white;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: bold;
    z-index: 3;
    box-shadow: 0 0 10px rgba(255, 68, 68, 0.5);
}

/* Pulsanti azioni */
.action-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.action-btn {
    padding: 15px 25px;
    background: linear-gradient(135deg, var(--bg-container), var(--bg-secondary));
    border: 2px solid var(--border-glow);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 0 15px rgba(255, 107, 53, 0.3);
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 25px rgba(255, 107, 53, 0.5);
    border-color: var(--accent-yellow);
}

.btn-icon {
    font-size: 18px;
}

/* Statistiche */
.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.stat-box {
    background: var(--bg-container);
    border: 2px solid var(--border-glow);
    border-radius: 15px;
    padding: 25px;
    text-align: center;
    box-shadow: 0 0 20px rgba(255, 107, 53, 0.2);
    transition: all 0.3s ease;
}

.stat-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 0 30px rgba(255, 107, 53, 0.4);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent-yellow);
    margin-bottom: 10px;
}

.stat-label {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Container output */
.output-container {
    background: var(--bg-container);
    border: 2px solid var(--border-glow);
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 0 20px rgba(255, 107, 53, 0.2);
}

.output-title {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: 20px;
    text-align: center;
    font-weight: 600;
}

.output-text {
    background: var(--bg-secondary);
    border-radius: 10px;
    padding: 20px;
    min-height: 150px;
    line-height: 1.8;
    font-size: 16px;
    color: var(--text-secondary);
    white-space: pre-wrap;
    word-wrap: break-word;
}

/* Evidenziazione caratteri invisibili */
.invisible-char {
    background: var(--accent-red);
    color: white;
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: bold;
    font-size: 14px;
    margin: 0 2px;
}

/* Footer */
.footer {
    text-align: center;
    padding: 30px 0;
    color: var(--text-secondary);
    opacity: 0.9;
    margin-top: auto;
    border-top: 1px solid rgba(255, 215, 0, 0.2);
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: center;
}

.footer-links {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-link {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--accent-yellow);
    text-decoration: none;
    font-weight: 600;
    padding: 10px 20px;
    border: 2px solid rgba(255, 215, 0, 0.3);
    border-radius: 25px;
    transition: all 0.3s ease;
    background: rgba(255, 215, 0, 0.1);
}

.footer-link:hover {
    background: rgba(255, 215, 0, 0.2);
    border-color: var(--accent-yellow);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 215, 0, 0.3);
}

.footer-icon {
    font-size: 1.1rem;
}

.footer-copyright {
    opacity: 0.8;
    font-size: 0.9rem;
}

.version-info {
    margin-top: 8px;
    font-size: 0.8rem;
    color: var(--accent-orange);
    font-weight: 600;
    opacity: 0.9;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .header-content {
        flex-direction: column;
        text-align: center;
        gap: 20px;
    }
    
    .logo {
        width: 280px;
    }
    
    .title-container {
        text-align: center;
    }
    
    .title {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1.1rem;
    }
    
    .action-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .action-btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
    
    .stats-container {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .stat-box {
        padding: 20px;
    }
    
    .stat-number {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .header-content {
        gap: 15px;
    }
    
    .logo {
        width: 220px;
    }
    
    .stats-container {
        grid-template-columns: 1fr;
    }
    
    .title {
        font-size: 1.5rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
}

/* Animazioni per elementi che appaiono */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0% {
        transform: scale(1);
        box-shadow: 0 0 20px rgba(255, 215, 0, 0.4);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 0 30px rgba(255, 215, 0, 0.6);
    }
    100% {
        transform: scale(1);
        box-shadow: 0 0 20px rgba(255, 215, 0, 0.4);
    }
}

.stat-box, .action-btn, .output-container {
    animation: fadeInUp 0.6s ease-out;
}

/* Stili per il drag and drop */
.drag-over {
    border-color: var(--accent-yellow) !important;
    background: rgba(255, 215, 0, 0.1) !important;
    transform: scale(1.02);
}

/* Nascondi overlay quando c'è testo */
.text-input-container.has-text .file-upload-overlay {
    display: none;
}