/**
 * Unified tab system for Portfolio theme
 * Based on blog-tabs style with btn-action design
 * Supports main tabs and sub-tabs
 */

/* ========================================
   MAIN TAB CONTAINER
   ======================================== */
.tabs {
    display: flex;
    justify-content: center;
    gap: 0.3rem;
    margin-bottom: 2rem;
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    border-radius: 25px;
    padding: 0.3rem;
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
    border: 1px solid var(--glass-border);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

/* Minimal modification of main tabs when subtabs are visible */
.tabs.has-subtabs {
    margin-bottom: 0; /* Remove only margin to stick to subtabs */
    position: relative;
    z-index: 2; /* Above subtabs for overlay effect */
}

/* ========================================



/* ========================================
   TAB BUTTONS - BTN-ACTION INHERITANCE
   ======================================== */
.tab-btn {
    /* Base inherited from btn-action */
    display: inline-flex;
    align-items: center;
    gap: var(--gap-sm);
    padding: 0.8rem 2rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 20px;
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-base);
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
    text-align: center;
    min-height: auto;
    justify-content: center;
    white-space: nowrap;
    
    /* Default tab style */
    background: transparent;
    border: none;
    cursor: pointer;
    font-family: inherit;
}

/* Hover state - Inspired by project tabs with btn-action style */
.tab-btn:hover:not(.active) {
    color: var(--primary-blue-text, #4fd1c7);
    background: rgba(79, 209, 199, 0.1);
    transform: translateY(-1px);
    text-decoration: none;
}

/* Active state - Adapted btn-action primary style */
.tab-btn.active {
    background: var(--primary-blue-bg);
    border-color: var(--primary-blue-border);
    color: var(--text-primary);
    box-shadow: 0 2px 10px rgba(52, 152, 219, 0.3);
    font-weight: var(--font-weight-bold);
}

.tab-btn.active:hover {
    background: var(--primary-blue-bg-hover);
    border-color: var(--primary-blue-border-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.4);
}

/* Icons in tabs */
.tab-btn svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

/* Emoji support */
.tab-btn .tab-emoji {
    font-size: 1.1em;
    margin-right: 0.5rem;
}

/* ========================================
   SUB-TAB SYSTEM (PROJECTS) - INTEGRATED STYLE
   ======================================== */
.sub-tabs {
    display: flex;
    justify-content: center;
    gap: 0.4rem;
    margin-top: -10px; /* Overlap slightly to create fusion effect */
    margin-bottom: 2rem;
    padding: 0.8rem 1.2rem 0.8rem 1.2rem; /* Reduced padding for more compact height */
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
    
    /* Fusion style - shape that connects to main tabs */
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    border-radius: 0 0 25px 25px; /* Rounded only at bottom for fusion effect */
    border: 1px solid var(--glass-border);
    border-top: none; /* No top border to create fusion effect */
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    
    /* Position to create fusion effect */
    position: relative;
    z-index: 1; /* Below main tabs for continuity effect */
    
    /* Smooth appearance animation */
    opacity: 0;
    transform: translateY(-8px);
    animation: subtabs-fade-in 0.35s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes subtabs-fade-in {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.sub-tab-btn {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1.2rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 18px;
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-base);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: center;
    justify-content: center;
    white-space: nowrap;
    position: relative;
    
    background: transparent;
    border: none;
    cursor: pointer;
    font-family: inherit;
    letter-spacing: 0.02em;
    gap: 0.5rem;
}

.sub-tab-btn .subtab-icon {
    font-size: 0.9em;
    opacity: 0.7;
    transition: all 0.3s ease;
}

.sub-tab-btn.active .subtab-icon,
.sub-tab-btn:hover .subtab-icon {
    opacity: 1;
    transform: scale(1.1);
}

/* Count badges in sub-tabs */
.sub-tab-btn .count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    padding: 0 6px;
    margin-left: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

/* Hover and active states similar to main tabs but more subtle */
.sub-tab-btn:hover:not(.active) {
    color: var(--primary-blue-text, #4fd1c7);
    background: rgba(79, 209, 199, 0.08);
    transform: translateY(-1px);
}

.sub-tab-btn:hover:not(.active) .count {
    background: rgba(79, 209, 199, 0.15);
    color: var(--primary-blue-text, #4fd1c7);
}

.sub-tab-btn.active {
    background: rgba(79, 209, 199, 0.12);
    color: var(--text-primary);
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(79, 209, 199, 0.2);
}

.sub-tab-btn.active .count {
    background: rgba(79, 209, 199, 0.25);
    color: var(--text-primary);
}

.sub-tab-btn.active:hover {
    background: rgba(79, 209, 199, 0.18);
    transform: translateY(-1px);
    box-shadow: 0 3px 12px rgba(79, 209, 199, 0.25);
}

.sub-tab-btn.active:hover .count {
    background: rgba(79, 209, 199, 0.35);
}

/* ========================================
   RESPONSIVE LAYOUTS
   ======================================== */
@media (max-width: 768px) {
    .tabs {
        gap: 0.25rem;
        padding: 0.25rem;
        margin-bottom: 1.5rem;
        margin-left: 0;
        margin-right: 0;
        width: 100%;
        overflow-x: auto; /* Allow horizontal scroll if needed */
        flex-wrap: nowrap; /* Keep in one line */
    }
    
    .tab-btn {
        padding: 0.65rem 1rem;
        font-size: 0.8rem;
        gap: 0.3rem;
        white-space: nowrap;
        flex-shrink: 0; /* Prevent shrinking */
    }
    
    .tab-btn .tab-icon,
    .tab-btn .tab-emoji {
        font-size: 0.95em;
    }
    
    .tab-btn .count {
        min-width: 18px;
        height: 18px;
        padding: 0 5px;
        font-size: 0.65rem;
    }
    
    .sub-tabs {
        display: none !important; /* Hide sub-tabs on mobile */
    }
    
    .sub-tab-btn {
        padding: 0.55rem 0.9rem;
        font-size: 0.75rem;
        gap: 0.3rem;
        white-space: nowrap;
        flex-shrink: 0;
    }
    
    .sub-tab-btn .subtab-icon {
        font-size: 0.85em;
    }
    
    .sub-tab-btn .count {
        min-width: 16px;
        height: 16px;
        padding: 0 4px;
        font-size: 0.6rem;
    }
}

@media (max-width: 480px) {
    .tabs {
        gap: 0.15rem;
        padding: 0.15rem;
        overflow-x: auto;
        overflow-y: hidden;
        flex-wrap: nowrap;
        -webkit-overflow-scrolling: touch; /* Smooth scrolling on iOS */
        justify-content: flex-start;
        width: 100%; /* Full width instead of fit-content */
        max-width: 100%;
        margin-left: 0;
        margin-right: 0;
        box-sizing: border-box;
    }
    
    .tab-btn {
        padding: 0.4rem 0.6rem;
        font-size: 0.65rem;
        min-width: auto;
        flex-shrink: 0;
        gap: 0.25rem;
    }
    
    .tab-btn .tab-icon,
    .tab-btn .tab-emoji {
        font-size: 0.85em;
    }
    
    .tab-btn .tab-label {
        font-size: 0.65rem;
    }
    
    .tab-btn .count {
        min-width: 14px;
        height: 14px;
        padding: 0 3px;
        font-size: 0.55rem;
        margin-left: 3px;
    }
    
    .sub-tabs {
        gap: 0.1rem;
        padding: 0.4rem;
        overflow-x: auto;
        overflow-y: hidden;
        flex-wrap: nowrap;
        -webkit-overflow-scrolling: touch;
        justify-content: flex-start;
        width: 100%; /* Full width instead of fit-content */
        max-width: 100%;
        margin-left: 0;
        margin-right: 0;
        box-sizing: border-box;
    }
    
    .sub-tab-btn {
        padding: 0.35rem 0.55rem;
        font-size: 0.6rem;
        flex-shrink: 0;
        gap: 0.25rem;
    }
    
    .sub-tab-btn .subtab-icon {
        font-size: 0.75em;
    }
    
    .sub-tab-btn .count {
        min-width: 12px;
        height: 12px;
        padding: 0 3px;
        font-size: 0.5rem;
        margin-left: 3px;
    }
}

/* ========================================
   ACCENT VARIANTS (FOR SPECIAL SECTIONS)
   ======================================== */
.tabs.accent .tab-btn.active {
    background: var(--accent-bg, rgba(255, 107, 53, 0.15));
    border-color: var(--accent-border, rgba(255, 107, 53, 0.4));
    color: var(--accent-color, rgba(255, 107, 53, 1));
    box-shadow: 0 2px 10px rgba(255, 107, 53, 0.3);
}

.tabs.accent .tab-btn:hover {
    background: rgba(255, 107, 53, 0.1);
    border-color: rgba(255, 107, 53, 0.3);
}

/* ========================================
   TAB CONTENTS
   ======================================== */
.tab-content {
    margin-top: 1rem;
}

.tab-panel {
    display: none;
    padding: 0;
}

.tab-panel.active {
    display: block;
}

/* Fade-in animation for panels */
.tab-panel.active {
    animation: fadeInUp 0.3s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   ADVANCED HOVER EFFECTS (inspired by project tabs)
   ======================================== */

/* Subtle shimmer effect on hover */
.tab-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(79, 209, 199, 0.1), transparent);
    transition: left 0.5s ease;
}

.tab-btn:hover:not(.active)::before {
    left: 100%;
}

/* Hover with subtle gradient like project tabs */
.tab-btn:hover:not(.active) {
    background: rgba(79, 209, 199, 0.1);
    box-shadow: 0 2px 10px rgba(79, 209, 199, 0.15);
}

/* ========================================
   GRADIENT HOVER EFFECTS (Project tabs style)
   ======================================== */

/* Active state with gradient like project tabs */
.tab-btn.active {
    background: linear-gradient(135deg, rgba(79, 209, 199, 0.8), rgba(79, 209, 199, 0.6));
    color: var(--text-primary);
    box-shadow: 0 4px 15px rgba(79, 209, 199, 0.3);
    font-weight: var(--font-weight-bold);
}

.tab-btn.active:hover {
    background: linear-gradient(135deg, rgba(79, 209, 199, 0.9), rgba(79, 209, 199, 0.7));
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(79, 209, 199, 0.4);
}