/* =====================================
   SKILLS PAGE - WEB3 CYBER STYLING
===================================== */

/* Hero Section - Similar to Experience/Projects pages */
.hero {
    min-height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.cyber-grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(0, 212, 255, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 255, 0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

.floating-particles {
    position: absolute;
    width: 100%;
    height: 100%;
}

.floating-particles::before,
.floating-particles::after {
    content: '';
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--accent-cyan);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

.floating-particles::before {
    top: 20%;
    left: 20%;
    animation-delay: 0s;
}

.floating-particles::after {
    top: 80%;
    right: 30%;
    animation-delay: 3s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) scale(1); opacity: 0.7; }
    50% { transform: translateY(-20px) scale(1.1); opacity: 1; }
}

.hero-content {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid var(--accent-cyan);
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-cyan);
    margin-bottom: 1.5rem;
    backdrop-filter: blur(10px);
}

.hero-title {
    font-size: 3.5rem;
    font-family: var(--font-orbitron);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-glow {
    color: var(--text-primary);
    text-shadow: 0 0 20px rgba(0, 212, 255, 0.5);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: #e2e8f0;
    line-height: 1.6;
    margin-bottom: 2.5rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-family: var(--font-orbitron);
    font-weight: 700;
    color: var(--accent-cyan);
    display: block;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.9rem;
    color: #e2e8f0;
    font-weight: 500;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

/* Skills Cube */
.skills-cube {
    width: 200px;
    height: 200px;
    position: relative;
    margin: 0 auto;
    transform-style: preserve-3d;
    animation: rotateCube 20s infinite linear;
}

@keyframes rotateCube {
    0% { transform: rotateX(0deg) rotateY(0deg); }
    100% { transform: rotateX(360deg) rotateY(360deg); }
}

.cube-face {
    position: absolute;
    width: 200px;
    height: 200px;
    background: rgba(0, 212, 255, 0.1);
    border: 2px solid var(--accent-cyan);
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-family: var(--font-orbitron);
    font-weight: 600;
    color: var(--accent-cyan);
    transition: all 0.3s ease;
}

.cube-face i {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.cube-face.front { transform: rotateY(0deg) translateZ(100px); }
.cube-face.back { transform: rotateY(180deg) translateZ(100px); }
.cube-face.right { transform: rotateY(90deg) translateZ(100px); }
.cube-face.left { transform: rotateY(-90deg) translateZ(100px); }
.cube-face.top { transform: rotateX(90deg) translateZ(100px); }
.cube-face.bottom { transform: rotateX(-90deg) translateZ(100px); }

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.scroll-arrow {
    width: 2px;
    height: 50px;
    background: linear-gradient(to bottom, transparent, var(--accent-cyan));
    position: relative;
    animation: scrollBounce 2s infinite;
}

.scroll-arrow::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 8px solid var(--accent-cyan);
}

@keyframes scrollBounce {
    0%, 100% { transform: translateY(0); opacity: 1; }
    50% { transform: translateY(10px); opacity: 0.7; }
}

/* Skills Section */
.skills-section {
    padding: 6rem 0;
    background: var(--primary-dark);
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 3rem;
    font-family: var(--font-orbitron);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.2rem;
    color: #e2e8f0;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

/* Cyber Tabs */
.cyber-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 4rem;
    flex-wrap: wrap;
}

.cyber-tab {
    position: relative;
    background: rgba(15, 23, 42, 0.7);
    border: 2px solid rgba(0, 212, 255, 0.3);
    color: #cbd5e1;
    padding: 1rem 2rem;
    border-radius: 0;
    clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
    cursor: pointer;
    /* Explicit properties only — avoids Windows GPU stutter from 'all' transitions */
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
    font-family: var(--font-orbitron);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    /* Reduced blur — full blur(10px) forces GPU layer per-element and stalls on Windows */
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.cyber-tab:hover,
.cyber-tab.active {
    background: rgba(0, 212, 255, 0.1);
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    transform: translateY(-2px);
}

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

.tab-glow {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent, var(--accent-cyan), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
    clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}

.cyber-tab:hover .tab-glow,
.cyber-tab.active .tab-glow {
    opacity: 0.1;
}

/* Tab Content — opacity/visibility avoids reflow on Windows */
.skill-tab-content {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    position: absolute;
    transition: opacity 0.25s ease, transform 0.25s ease;
    transform: translateY(8px);
    will-change: opacity, transform;
}

.skill-tab-content.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    position: static;
    transform: translateY(0);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* Cyber Skills Grid */
.cyber-skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.cyber-skill-card {
    position: relative;
    background: rgba(10, 10, 15, 0.8);
    border: 1px solid var(--border-cyber);
    backdrop-filter: blur(10px);
    padding: 2rem;
    transition: all 0.3s ease;
    clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
}

.cyber-skill-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent-cyan);
    box-shadow: 0 20px 40px rgba(0, 212, 255, 0.2);
}

.card-glow {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, var(--accent-cyan), var(--accent-green), var(--accent-purple));
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 1;
}

.cyber-skill-card:hover .card-glow {
    opacity: 0.05;
}

.skill-category-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-cyber);
    position: relative;
    z-index: 2;
}

.category-icon {
    width: 50px;
    height: 50px;
    background: rgba(0, 212, 255, 0.1);
    border: 2px solid var(--accent-cyan);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--accent-cyan);
}

.category-title {
    font-family: var(--font-orbitron);
    font-weight: 600;
    font-size: 1.5rem;
    color: #f8fafc;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.7);
}

/* Skills List */
.skills-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: relative;
    z-index: 2;
}

.cyber-skill-item {
    padding: 1rem;
    background: rgba(0, 0, 0, 0.3);
    border-left: 3px solid transparent;
    transition: all 0.3s ease;
}

.cyber-skill-item:hover {
    border-left-color: var(--accent-cyan);
    background: rgba(0, 212, 255, 0.05);
}

.skill-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.8rem;
}

.skill-name {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: #f8fafc;
    font-size: 1.1rem;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.7);
}

.skill-name i {
    font-size: 1.3rem;
}

.skill-level {
    padding: 0.3rem 0.8rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
}

.skill-level.expert {
    background: rgba(34, 197, 94, 0.2);
    color: var(--accent-green);
    border: 1px solid var(--accent-green);
}

.skill-level.advanced {
    background: rgba(0, 212, 255, 0.2);
    color: var(--accent-cyan);
    border: 1px solid var(--accent-cyan);
}

.skill-level.intermediate {
    background: rgba(251, 191, 36, 0.2);
    color: #fbbf24;
    border: 1px solid #fbbf24;
}

/* Cyber Progress Bar */
.cyber-progress-bar {
    position: relative;
    height: 8px;
    background: rgba(0, 212, 255, 0.1);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-green));
    border-radius: 10px;
    transition: width 1s ease;
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

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

.progress-glow {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--accent-cyan);
    filter: blur(10px);
    opacity: 0.3;
}

.skill-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: #cbd5e1;
}

.skill-experience {
    color: #cbd5e1;
}

.skill-percentage {
    font-family: var(--font-orbitron);
    font-weight: 600;
    color: var(--accent-cyan);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .skills-cube {
        width: 150px;
        height: 150px;
    }
    
    .cube-face {
        width: 150px;
        height: 150px;
    }
    
    .cube-face.front { transform: rotateY(0deg) translateZ(75px); }
    .cube-face.back { transform: rotateY(180deg) translateZ(75px); }
    .cube-face.right { transform: rotateY(90deg) translateZ(75px); }
    .cube-face.left { transform: rotateY(-90deg) translateZ(75px); }
    .cube-face.top { transform: rotateX(90deg) translateZ(75px); }
    .cube-face.bottom { transform: rotateX(-90deg) translateZ(75px); }
    
    .cyber-skills-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .cyber-tab {
        padding: 0.8rem 1.5rem;
    }
    
    .tab-text {
        display: none;
    }
}

@media (max-width: 480px) {
    .hero-stats {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .cyber-skill-card {
        padding: 1.5rem;
    }
    
    .skill-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}

/* Animation for stats counting */
.stat-number[data-target] {
    animation: countUp 2s ease-out forwards;
}

@keyframes countUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* =====================================================
   CSS-DRIVEN CARD ANIMATION (replaces inline style
   mutations that caused Windows GPU compositor stutter)
   ===================================================== */
.cyber-skill-card {
    /* Start invisible; JS adds .card-visible with stagger delay */
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.5s ease-out var(--card-delay, 0ms),
                transform 0.5s ease-out var(--card-delay, 0ms),
                /* Keep hover transitions fast and separate */
                border-color 0.25s ease,
                box-shadow 0.25s ease;
    will-change: opacity, transform;
}

.cyber-skill-card.card-visible {
    opacity: 1;
    transform: translateY(0);
    will-change: auto;
}

/* Reduce motion support */
@media (prefers-reduced-motion: reduce) {
    .cyber-skill-card,
    .skill-tab-content,
    .tab-content {
        transition: none !important;
        animation: none !important;
        opacity: 1 !important;
        transform: none !important;
    }
}