/* Clean Tab System */
:root {
    --tab-primary: #6366f1;
    --tab-primary-hover: #4f46e5;
    --tab-bg: rgba(30, 27, 75, 0.6);
    --tab-bg-hover: rgba(99, 102, 241, 0.3);
    --tab-text: #e2e8f0;
    --tab-border: rgba(99, 102, 241, 0.3);
    --tab-content-bg: rgba(30, 41, 59, 0.8);
    --tab-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --tab-shadow: 0 4px 20px -5px rgba(99, 102, 241, 0.4);
}

.tab-system {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    position: relative;
}

.tab-header {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin: 0 auto 2rem;
    overflow-x: auto;
    padding: 0.5rem 1rem;
    scrollbar-width: none;
    -ms-overflow-style: none;
    position: relative;
    z-index: 1;
    scroll-padding: 0 1rem;
    scroll-behavior: smooth;
}

.tab-header::-webkit-scrollbar {
    display: none;
}

.tab-button {
    background: rgba(139, 92, 246, 0.05);
    border: 2px solid rgba(139, 92, 246, 0.2);
    color: var(--text-light);
    padding: 1rem 2rem;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1rem;
    font-weight: 500;
    position: relative;
    overflow: hidden;
    border: none;
    outline: none;
    font-family: inherit;
    margin: 0;
    -webkit-tap-highlight-color: transparent;
}

.tab-button i {
    font-size: 1.1em;
    transition: var(--tab-transition);
}

.tab-button:not(.active):hover {
    background: var(--tab-bg-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px -2px rgba(99, 102, 241, 0.2);
}

.tab-button:focus-visible {
    outline: 2px solid var(--tab-primary);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.3);
}

.tab-button.active {
    background: linear-gradient(135deg, var(--tab-primary), #8b5cf6);
    color: white;
    border-color: transparent;
    box-shadow: var(--tab-shadow);
    transform: translateY(-2px);
}

.tab-button[aria-selected="true"] {
    z-index: 2;
}

/* Loading state */
.tab-button.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, 
        transparent, 
        rgba(255, 255, 255, 0.1), 
        transparent
    );
    animation: shimmer 1.5s infinite;
    z-index: 1;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.tab-content {
    display: none;
    background: var(--tab-content-bg);
    border: 1px solid var(--tab-border);
    border-radius: 16px;
    overflow: hidden;
    color: var(--tab-text);
    margin-top: 1.5rem;
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.2);
    opacity: 0;
    transform: translateY(20px) scale(0.98);
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), 
                transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: opacity, transform;
    position: relative;
    z-index: 1;
}

.tab-content[aria-hidden="false"] {
    display: block;
    opacity: 1;
    transform: translateY(0) scale(1);
}

.tab-content:focus-visible {
    outline: 2px solid var(--tab-primary);
    outline-offset: 2px;
}

/* Loading state for content */
.tab-content.loading::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, 
        transparent, 
        var(--tab-primary), 
        transparent
    );
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
    z-index: 2;
}

@keyframes loading {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.pane-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: 500px;
    padding: 3rem 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.pane-visual {
    display: none; /* Hide visual section for cleaner centered layout */
}

.pane-visual::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), transparent);
    z-index: 1;
}

.placeholder-image {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 6rem;
    color: rgba(99, 102, 241, 0.5);
    z-index: 2;
}

.pane-details {
    width: 100%;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.pane-details h2 {
    font-size: 2.5rem;
    margin: 0 0 1rem;
    color: white;
    background: linear-gradient(135deg, #e2e8f0, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-align: center;
}

.pane-details p {
    color: #cbd5e1;
    margin: 0 0 2rem;
    line-height: 1.6;
    text-align: center;
    font-size: 1.1rem;
}

.pane-details .text-sm {
    font-size: 0.9rem;
    color: #94a3b8;
    margin-top: 1rem;
    text-align: center;
}

/* Feature Cards Grid */
.feature-cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin: 3rem 0;
    width: 100%;
    max-width: 900px;
}

.feature-card-item {
    background: rgba(139, 92, 246, 0.08);
    border: 2px solid rgba(139, 92, 246, 0.2);
    border-radius: 16px;
    padding: 2.5rem 1.5rem;
    text-align: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.feature-card-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), transparent);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.feature-card-item:hover {
    transform: translateY(-8px);
    border-color: rgba(139, 92, 246, 0.6);
    box-shadow: 0 12px 40px rgba(139, 92, 246, 0.3);
    background: rgba(139, 92, 246, 0.12);
}

.feature-card-item:hover::before {
    opacity: 1;
}

.feature-card-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #8b5cf6, #6366f1);
    border-radius: 20px;
    font-size: 2rem;
    color: white;
    box-shadow: 0 8px 25px rgba(139, 92, 246, 0.4);
    transition: all 0.4s ease;
}

.feature-card-item:hover .feature-card-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 12px 35px rgba(139, 92, 246, 0.6);
}

.feature-card-item h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #e2e8f0;
    margin: 0;
    line-height: 1.4;
}

/* Responsive for feature cards */
@media (max-width: 768px) {
    .feature-cards-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .feature-card-item {
        padding: 2rem 1rem;
    }
    
    .feature-card-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 2.5rem;
    border-radius: 12px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    white-space: nowrap;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
}

.btn-primary {
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    color: white;
    box-shadow: 0 8px 25px -8px rgba(99, 102, 241, 0.5);
    width: 100%;
    max-width: 400px;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px -10px rgba(99, 102, 241, 0.6);
}

.text-sm {
    font-size: 0.875rem;
}

.mt-3 {
    margin-top: 0.75rem;
}

/* Focus styles for keyboard navigation */
.tab-button:focus:not(:focus-visible) {
    outline: none;
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
    .tab-content,
    .tab-button,
    .tab-button i {
        transition: none !important;
        animation: none !important;
    }
    
    .tab-content[aria-hidden="false"] {
        transform: none;
    }
}

/* Print styles */
@media print {
    .tab-header {
        display: none;
    }
    
    .tab-content {
        display: block !important;
        opacity: 1 !important;
        transform: none !important;
        page-break-inside: avoid;
    }
    
    .tab-content:not(:first-child) {
        page-break-before: always;
    }
}

/* Responsive */
@media (max-width: 1024px) {
    .pane-content {
        grid-template-columns: 1fr;
    }
    
    .pane-visual {
        min-height: 200px;
    }
    
    .pane-details {
        padding: 2rem;
    }
    
    .tab-button {
        padding: 0.75rem 1.25rem;
        font-size: 0.95rem;
    }
}

@media (max-width: 768px) {
    .tab-header {
        justify-content: flex-start;
        gap: 0.5rem;
        padding: 0.5rem 1rem;
        margin: 0 -1rem 1.5rem;
    }
    
    .tab-button {
        padding: 0.65rem 1.25rem;
        font-size: 0.9rem;
        border-radius: 8px;
    }
    
    .pane-details {
        padding: 1.5rem;
    }
    
    .pane-details h2 {
        font-size: 1.75rem;
    }
    
    .placeholder-image {
        font-size: 4rem;
    }
}

@media (max-width: 480px) {
    .tab-button {
        padding: 0.6rem 1rem;
        font-size: 0.85rem;
    }
    
    .pane-details {
        padding: 1.25rem;
    }
    
    .pane-details h2 {
        font-size: 1.5rem;
    }
    
    .feature-list li {
        font-size: 0.95rem;
    }
    
    .btn {
        width: 100%;
        padding: 0.8rem 1.5rem;
    }
}