* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-bg: #0a0a0a;
    --secondary-bg: #1a1a1a;
    --accent-bg: #2a2a2a;
    --hover-bg: #3a3a3a;
    --primary-text: #ffffff;
    --secondary-text: #b0b0b0;
    --accent-color: #00d4ff;
    --gradient-primary: linear-gradient(135deg, #00d4ff, #0099cc);
    --gradient-secondary: linear-gradient(135deg, #667eea, #764ba2);
    --shadow-dark: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.3);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --accent-primary: #7c3aed;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--primary-bg);
    color: var(--primary-text);
    line-height: 1.6;
    overflow-x: hidden;
}


body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(118, 75, 162, 0.1) 0%, transparent 50%);
    z-index: -1;
    animation: backgroundShift 20s ease-in-out infinite;
}

@keyframes backgroundShift {
    0%, 100% { transform: translateX(0) translateY(0); }
    25% { transform: translateX(-20px) translateY(-20px); }
    50% { transform: translateX(20px) translateY(-30px); }
    75% { transform: translateX(-10px) translateY(20px); }
}


.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
}

.nav-logo a {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary-text);
    text-decoration: none;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: #ffffff;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    position: relative;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition);
    transform: translateX(-50%);
}

.nav-link:hover {
    color: var(--primary-text);
    background: rgba(255, 255, 255, 0.1);
}

.nav-link:hover::before {
    width: 80%;
}

.nav-link.active {
    color: var(--accent-color);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    justify-content: space-between;
    align-items: center;
    height: 18px;
    width: 24px;
    gap: 4px;

}

.bar {
    width: 25px;
    height: 4px;
    background: var(--primary-text);
    border-radius: 6px;
    transition: var(--transition);
}


.page-header {
    background: var(--secondary-bg);
    padding: 150px 0 100px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-primary);
    opacity: 0.1;
    z-index: 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    z-index: 1;
}

.page-header h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 1s ease-out;
}

.page-header p {
    font-size: 1.3rem;
    color: var(--secondary-text);
    animation: fadeInUp 1s ease-out 0.2s both;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}


.skills-content {
    padding: 100px 0;
    max-width: 1200px;
    margin: 0 auto;
    padding-left: 2rem;
    padding-right: 2rem;
}

.skill-categories {
    display: flex;
    flex-direction: column;
    gap: 4rem;
}

.skill-category {
    background: var(--secondary-bg);
    border-radius: var(--border-radius);
    padding: 3rem;
    box-shadow: var(--shadow-dark);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
    animation: fadeInUp 0.8s ease-out;
}

.skill-category:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow);
    border-color: rgba(0, 212, 255, 0.3);
}

.skill-category h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--primary-text);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.skill-category h2 i {
    color: var(--accent-color);
    font-size: 1.8rem;
}


.tech-icons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.tech-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 2rem;
    background: var(--accent-bg);
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    animation: techItemFadeIn 0.6s ease-out forwards;
    opacity: 0;
}

.tech-item:nth-child(1) { animation-delay: 0.1s; }
.tech-item:nth-child(2) { animation-delay: 0.2s; }
.tech-item:nth-child(3) { animation-delay: 0.3s; }
.tech-item:nth-child(4) { animation-delay: 0.4s; }
.tech-item:nth-child(5) { animation-delay: 0.5s; }
.tech-item:nth-child(6) { animation-delay: 0.6s; }

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

.tech-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-secondary);
    opacity: 0;
    transition: var(--transition);
}

.tech-item:hover::before {
    opacity: 0.1;
}

.tech-item:hover {
    transform: translateY(-10px) rotate(2deg);
    border-color: var(--accent-color);
    box-shadow: var(--shadow-glow);
}

.tech-item i {
    font-size: 3rem;
    transition: var(--transition);
    position: relative;
    z-index: 1;
}

.tech-item:hover i {
    transform: scale(1.2) rotate(-5deg);
}

.tech-item span {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-text);
    position: relative;
    z-index: 1;
    transition: var(--transition);
}

.tech-item:hover span {
    color: var(--accent-color);
}


@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background: rgba(26, 26, 26, 0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: flex-start;
        padding-top: 50px;
        transition: var(--transition);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active .bar:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }

    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active .bar:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }

    .page-header h1 {
        font-size: 2.5rem;
    }

    .page-header p {
        font-size: 1.1rem;
    }

    .skill-category {
        padding: 2rem;
    }

    .tech-icons {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 1.5rem;
    }

    .tech-item {
        padding: 1.5rem;
    }

    .tech-item i {
        font-size: 2.5rem;
    }
}

@media (max-width: 480px) {
    .page-header {
        padding: 120px 0 80px;
    }

    .page-header h1 {
        font-size: 2rem;
    }

    .skills-content {
        padding: 60px 0;
    }

    .skill-category {
        padding: 1.5rem;
    }

    .tech-icons {
        grid-template-columns: 1fr;
    }

    .tech-item {
        padding: 1.5rem;
    }

    .tech-item i {
        font-size: 2rem;
    }
}


::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--accent-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-primary);
}