/* Variabili colori - Design allegro e moderno */
:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --warning-gradient: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-tertiary: #94a3b8;
    
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

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

body {
    font-family: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow: hidden;
}

/* Container principale */
.app-container {
    height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
}

/* Header */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    position: relative;
    z-index: 10;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo svg {
    width: 36px;
    height: 36px;
    color: #667eea;
    background: linear-gradient(135deg, #667eea20 0%, #764ba220 100%);
    padding: 6px;
    border-radius: var(--radius-md);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.settings-btn {
    width: 44px;
    height: 44px;
    border: none;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.settings-btn:hover {
    background: var(--primary-gradient);
    color: white;
    transform: rotate(30deg);
}

.settings-btn svg {
    width: 22px;
    height: 22px;
}

/* Indicatore lingua automatica */
.language-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px 24px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.language-indicator span {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    padding: 8px 20px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
}

.language-indicator span.detected-it {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

.language-indicator span.detected-en {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

/* Area traduzione */
.translation-area {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    padding: 24px;
    overflow: hidden;
}

.input-section,
.output-section {
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.textarea-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: box-shadow var(--transition-normal);
}

.textarea-container:focus-within {
    box-shadow: var(--shadow-xl);
}

textarea {
    flex: 1;
    width: 100%;
    padding: 20px;
    border: none;
    background: transparent;
    font-family: inherit;
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--text-primary);
    resize: none;
    outline: none;
}

textarea::placeholder {
    color: var(--text-tertiary);
}

#outputText {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
}

.textarea-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    border-top: 1px solid var(--border-color);
    background: var(--bg-tertiary);
}

.action-btn {
    width: 36px;
    height: 36px;
    border: none;
    background: transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.action-btn:hover {
    background: var(--bg-secondary);
    color: #667eea;
    transform: scale(1.1);
}

.action-btn svg {
    width: 20px;
    height: 20px;
}

.char-count {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    font-weight: 500;
}

/* Status indicator */
.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--text-tertiary);
    transition: all var(--transition-normal);
}

.status-indicator.translating {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    animation: pulse 1.5s infinite;
}

.status-indicator.success {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
}

.status-indicator.error {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.2);
        opacity: 0.7;
    }
}

/* Pulsante traduci */
.translate-section {
    padding: 0 24px 24px;
    display: flex;
    justify-content: center;
}

.translate-btn {
    padding: 16px 48px;
    border: none;
    background: var(--primary-gradient);
    border-radius: var(--radius-xl);
    color: white;
    font-family: inherit;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.translate-btn:hover:not(:disabled) {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.5);
}

.translate-btn:active:not(:disabled) {
    transform: translateY(-1px);
}

.translate-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.btn-icon {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-normal);
}

.translate-btn:hover:not(:disabled) .btn-icon {
    transform: translateX(4px);
}

.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.modal.show {
    display: flex;
    opacity: 1;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow-xl);
    transform: scale(0.95);
    transition: transform var(--transition-normal);
}

.modal.show .modal-content {
    transform: scale(1);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.close-btn {
    width: 36px;
    height: 36px;
    border: none;
    background: transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.close-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.close-btn svg {
    width: 20px;
    height: 20px;
}

.modal-body {
    padding: 24px;
}

.setting-item {
    margin-bottom: 20px;
}

.setting-item:last-child {
    margin-bottom: 0;
}

.setting-item label {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.setting-item input,
.setting-item select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-primary);
    background: var(--bg-primary);
    transition: all var(--transition-fast);
}

.setting-item input:focus,
.setting-item select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.help-text {
    display: block;
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-top: 6px;
}

.refresh-btn {
    margin-top: 10px;
    padding: 10px 16px;
    border: 2px solid var(--border-color);
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.refresh-btn:hover:not(:disabled) {
    border-color: #667eea;
    color: #667eea;
}

.refresh-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.refresh-btn svg {
    width: 18px;
    height: 18px;
}

.refresh-btn svg.spin {
    animation: spin 1s linear infinite;
}

.modal-footer {
    padding: 20px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
}

.save-btn {
    padding: 12px 32px;
    border: none;
    background: var(--primary-gradient);
    border-radius: var(--radius-lg);
    color: white;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.save-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 16px 32px;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    font-weight: 600;
    z-index: 2000;
    opacity: 0;
    transition: all var(--transition-normal);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.success {
    background: var(--success-gradient);
    color: white;
}

.toast.error {
    background: var(--secondary-gradient);
    color: white;
}

.toast.warning {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    color: white;
}

/* Responsive */
@media (max-width: 768px) {
    .translation-area {
        grid-template-columns: 1fr;
        grid-template-rows: 1fr 1fr;
    }
    
    .language-selector {
        flex-wrap: wrap;
        gap: 12px;
    }
    
    .lang-group {
        flex: 1;
        justify-content: center;
    }
    
    .swap-btn {
        order: 1;
        width: 40px;
        height: 40px;
    }
}

/* Scrollbar personalizzata */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
}