:root {
--primary-color: #6b7280;
    --primary-gradient: linear-gradient(135deg, #4b5563 0%, #374151 100%);
    --secondary-color: #64748b;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --border-color: #e2e8f0;
    --shadow: 0 10px 30px rgba(0,0,0,0.1);
    --shadow-hover: 0 20px 40px rgba(0,0,0,0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --border-color: #334155;
    --shadow: 0 10px 30px rgba(0,0,0,0.3);
    --shadow-hover: 0 20px 40px rgba(0,0,0,0.4);
}

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--bg-secondary);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: var(--primary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav-link:hover::after {
    width: 100%;
}

.theme-toggle {
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: var(--transition);
}

.theme-toggle:hover {
    background: var(--border-color);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--primary-gradient);
    color: white;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.1);
    z-index: 1;
}

.hero-decor {
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    overflow: hidden;
}

.hero-particle {
    position: absolute;
    border-radius: 50%;
    background: rgba(243, 244, 246, 0.3);
    pointer-events: none;
    will-change: transform;
}

.hero-particle.circle-1 {
    top: 20%;
    right: 15%;
    width: 80px;
    height: 80px;
    animation: float 6s ease-in-out infinite;
}

.hero-particle.circle-2 {
    bottom: 30%;
    left: 10%;
    width: 60px;
    height: 60px;
    animation: float 8s ease-in-out infinite reverse;
}

.hero-particle.circle-3 {
    top: 60%;
    left: 25%;
    width: 40px;
    height: 40px;
    animation: float 10s ease-in-out infinite 2s;
}

.hero-particle.circle-4 {
    top: 10%;
    left: 60%;
    width: 50px;
    height: 50px;
    animation: float 7s ease-in-out infinite reverse 4s;
}

.hero-line {
    position: absolute;
    background: rgba(243, 244, 246, 0.4);
    pointer-events: none;
    will-change: transform;
}

.hero-line.line-1 {
    top: 40%;
    left: 70%;
    width: 3px;
    height: 120px;
    transform-origin: bottom;
    animation: rotate 12s linear infinite;
}

.hero-line.line-2 {
    bottom: 20%;
    right: 20%;
    width: 2px;
    height: 100px;
    transform-origin: top;
    animation: rotate 16s linear infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

@keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@media (max-width: 768px) {
    .hero-decor::before,
    .hero-decor::after {
        width: 50px;
        height: 50px;
    }
}

.hero-container {
    position: relative;
    z-index: 2;
    max-width: 800px;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: clamp(1.2rem, 3vw, 1.8rem);
    font-weight: 400;
    margin-bottom: 1rem;
    min-height: 2rem;
}

.typing-text {
    color: white;
}

.cursor {
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.hero-tagline {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: rgba(255,255,255,0.2);
    color: white;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.3);
}

.btn-primary:hover {
    background: white;
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 1px solid rgba(255,255,255,0.5);
}

.btn-secondary:hover {
    background: white;
    color: var(--primary-color);
}

/* Sections */
.section {
    padding: 100px 0;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    text-align: center;
    margin-bottom: 4rem;
    font-weight: 700;
}

/* About */
.about-content {
    max-width: 800px;
    margin: 0 auto;
    font-size: 1.1rem;
    text-align: center;
    line-height: 1.8;
}

/* Skills */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.skill-category {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: 20px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.skill-category:hover {
    transform: translateY(-5px);
}

.skill-category h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.skill-category ul {
    list-style: none;
}

.skill-category li {
    padding: 0.5rem 0;
    opacity: 0.8;
    transition: var(--transition);
}

.skill-category li:hover {
    opacity: 1;
    padding-left: 1rem;
}

/* Projects */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--bg-secondary);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.project-image {
    height: 200px;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: white;
}

.project-content {
    padding: 2rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.project-content h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.project-content p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.project-tech span {
    background: var(--border-color);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.project-links {
    margin-top: auto;
}

.project-links a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.project-links a:hover {
    color: #4b5563;
}

/* Education */
.education-item {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.education-item h3 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.education-institution {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.education-status {
    color: var(--text-secondary);
}

/* Certifications */
.certs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.cert-card {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: 20px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

.cert-card:hover {
    transform: translateY(-5px);
}

.cert-card h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.cert-card a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    padding: 10px 20px;
    border: 2px solid var(--primary-color);
    border-radius: 50px;
    display: inline-block;
    transition: var(--transition);
}

.cert-card a:hover {
    background: var(--primary-color);
    color: white;
}

/* Contact */
.contact-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-info {
    margin-bottom: 3rem;
}

.contact-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.contact-item i {
    font-size: 1.3rem;
    width: 30px;
    color: var(--primary-color);
}

.contact-item a {
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

.contact-item a:hover {
    color: var(--primary-color);
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.footer p {
    color: var(--text-secondary);
}

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

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: var(--transition);
}

.fade-in.visible {
    animation: fadeInUp 0.6s ease forwards;
}

/* Responsive */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--bg-secondary);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow);
        padding: 2rem 0;
    }

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

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .contact-item {
        flex-direction: column;
        gap: 0.5rem;
    }
}

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

    .hero-container {
        padding: 0 20px;
    }
}