/* ===== RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-dark: #0a192f;
    --secondary-dark: #112240;
    --accent-blue: #64ffda;
    --accent-green: #00ff88;
    --text-light: #ccd6f6;
    --text-gray: #8892b0;
    --white: #ffffff;
    --gradient-bg: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary-dark) 100%);
    --shadow: 0 10px 30px -15px rgba(2, 12, 27, 0.7);
    --transition: all 0.25s cubic-bezier(0.645, 0.045, 0.355, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Calibri', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--gradient-bg);
    color: var(--text-light);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5 {
    color: var(--white);
    margin-bottom: 1rem;
    line-height: 1.2;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    position: relative;
    display: inline-block;
    margin-bottom: 2rem;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 4px;
    background: var(--accent-blue);
    border-radius: 2px;
}

h3 {
    font-size: 1.5rem;
    color: var(--accent-green);
}

p {
    color: var(--text-gray);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

/* ===== LAYOUT ===== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== HEADER & NAVIGATION ===== */
.site-header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(10, 25, 47, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1.5rem 0;
    border-bottom: 1px solid rgba(100, 255, 218, 0.1);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--accent-blue);
}

.logo-text h1 {
    font-size: 1.5rem;
    margin: 0;
}

.logo-text p {
    font-size: 0.9rem;
    margin: 0;
    color: var(--text-gray);
}

/* Desktop Navigation */
.nav-desktop {
    display: none;
}

@media (min-width: 768px) {
    .nav-desktop {
        display: flex;
        gap: 2rem;
    }
}

.nav-link {
    color: var(--text-light);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

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

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

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

/* Mobile Menu */
.menu-toggle {
    display: block;
    background: none;
    border: none;
    color: var(--accent-blue);
    font-size: 1.8rem;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1002;
}

@media (min-width: 768px) {
    .menu-toggle {
        display: none;
    }
}

.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 300px;
    height: 100vh;
    background: var(--primary-dark);
    padding: 6rem 2rem 2rem;
    transition: var(--transition);
    z-index: 1001;
    border-left: 1px solid rgba(100, 255, 218, 0.1);
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu .nav-link {
    display: block;
    padding: 1rem 0;
    font-size: 1.2rem;
    border-bottom: 1px solid rgba(100, 255, 218, 0.1);
}

.menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 1000;
}

.menu-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ===== MAIN CONTENT ===== */
.main-content {
    margin-top: 100px;
    padding: 2rem 0;
    min-height: calc(100vh - 200px);
}

/* ===== VIDEO HERO ===== */
.video-hero {
    position: relative;
    width: 100%;
    height: 70vh;
    overflow: hidden;
    border-radius: 15px;
    margin-bottom: 3rem;
}

.video-container {
    width: 100%;
    height: 100%;
}

.video-container video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 25, 47, 0.7);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 2rem;
}

.video-overlay h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: 1rem;
}

.video-overlay p {
    font-size: 1.2rem;
    max-width: 600px;
    color: var(--text-light);
}

/* ===== CARDS & SECTIONS ===== */
.section {
    padding: 4rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.card {
    background: var(--secondary-dark);
    border-radius: 15px;
    padding: 2rem;
    transition: var(--transition);
    border: 1px solid rgba(100, 255, 218, 0.1);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, transparent, rgba(100, 255, 218, 0.1), transparent);
    transform: translateX(-100%);
    transition: transform 0.6s;
}

.card:hover::before {
    transform: translateX(100%);
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow);
    border-color: var(--accent-blue);
}

.card-icon {
    font-size: 2.5rem;
    color: var(--accent-blue);
    margin-bottom: 1rem;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.8rem;
    background: transparent;
    color: var(--accent-blue);
    border: 2px solid var(--accent-blue);
    border-radius: 4px;
    text-decoration: none;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    background: var(--accent-blue);
    transition: width 0.3s;
    z-index: -1;
}

.btn:hover::before {
    width: 100%;
}

.btn:hover {
    color: var(--primary-dark);
}

.btn-primary {
    background: var(--accent-blue);
    color: var(--primary-dark);
}

.btn-primary:hover {
    background: transparent;
    color: var(--accent-blue);
}

.btn-download {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--accent-green);
    color: var(--primary-dark);
    border: none;
    border-radius: 50%;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: 0 5px 15px rgba(0, 255, 136, 0.3);
    z-index: 999;
    transition: var(--transition);
}

.btn-download:hover {
    transform: scale(1.1) rotate(10deg);
    box-shadow: 0 8px 20px rgba(0, 255, 136, 0.5);
}

/* ===== SKILLS ===== */
.skills-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.skill-category {
    background: var(--secondary-dark);
    padding: 1.5rem;
    border-radius: 10px;
    border: 1px solid rgba(100, 255, 218, 0.1);
}

.skill-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.8rem;
    padding-bottom: 0.8rem;
    border-bottom: 1px solid rgba(100, 255, 218, 0.1);
}

.skill-name {
    color: var(--text-light);
}

.skill-bar {
    flex-grow: 1;
    height: 8px;
    background: rgba(100, 255, 218, 0.1);
    border-radius: 4px;
    margin: 0 1rem;
    overflow: hidden;
}

.skill-level {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
    border-radius: 4px;
    width: 0;
    transition: width 1.5s ease-in-out;
}

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

.project-card {
    background: var(--secondary-dark);
    border-radius: 15px;
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid rgba(100, 255, 218, 0.1);
}

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

.project-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.project-content {
    padding: 1.5rem;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 1rem 0;
}

.tech-tag {
    background: rgba(100, 255, 218, 0.1);
    color: var(--accent-blue);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.9rem;
}

/* ===== CERTIFICATIONS ===== */
.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.cert-card {
    background: var(--secondary-dark);
    border-radius: 15px;
    padding: 2rem;
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(100, 255, 218, 0.1);
}

.cert-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-green);
}

.cert-image {
    width: 100%;
    max-width: 300px;
    height: 200px;
    object-fit: contain;
    margin-bottom: 1rem;
    border-radius: 10px;
}

/* ===== EXPERIENCE ===== */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--accent-blue);
    transform: translateX(-50%);
}

.timeline-item {
    margin-bottom: 3rem;
    position: relative;
    width: 50%;
    padding-right: 3rem;
}

.timeline-item:nth-child(even) {
    margin-left: 50%;
    padding-right: 0;
    padding-left: 3rem;
}

.timeline-date {
    background: var(--accent-blue);
    color: var(--primary-dark);
    padding: 0.3rem 1rem;
    border-radius: 20px;
    font-weight: 600;
    display: inline-block;
    margin-bottom: 0.5rem;
}

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

.contact-card {
    background: var(--secondary-dark);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(100, 255, 218, 0.1);
}

.contact-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-blue);
}

.contact-icon {
    font-size: 2.5rem;
    color: var(--accent-blue);
    margin-bottom: 1rem;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}

.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: var(--secondary-dark);
    color: var(--accent-blue);
    border-radius: 50%;
    font-size: 1.5rem;
    transition: var(--transition);
    border: 2px solid rgba(100, 255, 218, 0.1);
}

.social-link:hover {
    background: var(--accent-blue);
    color: var(--primary-dark);
    transform: translateY(-3px);
}

/* ===== FOOTER ===== */
.site-footer {
    background: var(--primary-dark);
    padding: 3rem 0 1.5rem;
    border-top: 1px solid rgba(100, 255, 218, 0.1);
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    justify-content: center;
}

.copyright {
    color: var(--text-gray);
    font-size: 0.9rem;
    margin-top: 2rem;
}

/* ===== 3D EFFECTS ===== */
.card-3d {
    transform-style: preserve-3d;
    perspective: 1000px;
}

.card-3d:hover {
    transform: rotateY(10deg) rotateX(5deg);
}

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

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

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .header-content {
        padding: 0 1rem;
    }
    
    .video-hero {
        height: 50vh;
    }
    
    .cards-grid,
    .project-grid,
    .cert-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline::before {
        left: 30px;
    }
    
    .timeline-item {
        width: 100%;
        padding-left: 70px;
        padding-right: 0;
    }
    
    .timeline-item:nth-child(even) {
        margin-left: 0;
        padding-left: 70px;
    }
    
    .btn-download {
        bottom: 20px;
        right: 20px;
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .video-hero {
        height: 40vh;
    }
    
    .mobile-menu {
        width: 250px;
    }
}

/* ===== PRINT STYLES ===== */
@media print {
    .btn-download,
    .menu-toggle,
    .site-header,
    .site-footer {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
    
    .main-content {
        margin-top: 0;
    }
}