:root {
    --primary: #3498db;
    --primary-dark: #2980b9;
    --secondary: #2ecc71;
    --dark: #2c3e50;
    --light: #ecf0f1;
    --gray: #95a5a6;
    --danger: #e74c3c;
    --warning: #f39c12;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
    --bg: #f9f9f9;
    --text: #2c3e50;
    --card-bg: white;
    --footer-bg: #2c3e50;
}

html.dark-mode,
body.dark-mode,
.dark-mode {
    --bg: #1a1a1a;
    --text: #f0f0f0;
    --dark: #f0f0f0;
    --light: #2d2d2d;
    --card-bg: #2d2d2d;
    --gray: #888;
    --footer-bg: #1a1a1a;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* Разрешаем выделение для форм и текстовых элементов */
input, textarea, [contenteditable="true"] {
    -webkit-user-select: text;
    -moz-user-select: text;
    -ms-user-select: text;
    user-select: text;
}

/* Защита изображений */
img {
    -webkit-user-drag: none;
    -khtml-user-drag: none;
    -moz-user-drag: none;
    -o-user-drag: none;
    pointer-events: none;
}

/* Разрешаем клики по изображениям в портфолио и других интерактивных элементах */
.portfolio-item img,
.about-img img,
.certificate-img img,
.modal-img,
img[loading="lazy"] {
    pointer-events: auto;
}

body {
    font-family: 'Montserrat', sans-serif;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--bg);
    overflow-x: hidden;
    transition: background-color 0.5s ease, color 0.5s ease;
}

/* Preloader */
.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.2s ease;
}

.preloader.fade-out {
    opacity: 0;
    pointer-events: none;
}

.loader {
    width: 50px;
    height: 50px;
    border: 5px solid var(--primary);
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 1s linear infinite;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
}

.loader-circle {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary);
    animation: bounce 1.5s infinite ease-in-out;
}

.loader-circle:nth-child(1) {
    animation-delay: 0s;
}

.loader-circle:nth-child(2) {
    animation-delay: 0.2s;
}

.loader-circle:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-30px);
    }
}

h1, h2, h3, h4 {
    font-family: 'Playfair Display', serif;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text);
}

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

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

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

.btn {
    display: inline-block;
    padding: 12px 24px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 14px;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

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

.btn-secondary {
    background: var(--secondary);
}

.btn-secondary:hover {
    background: #27ae60;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 200%;
    height: 100%;
    background: linear-gradient(
        45deg,
        var(--primary),
        var(--secondary),
        var(--primary),
        var(--secondary)
    );
    background-size: 200% 100%;
    z-index: -1;
    transition: background-position 0.5s ease;
}

.btn:hover::before {
    background-position: 100% 0;
    animation: gradient-shift 3s linear infinite;
}

@keyframes gradient-shift {
    0% { background-position: 0% 50%; }
    100% { background-position: 200% 50%; }
}

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

.section {
    padding: 80px 0;
    position: relative;
    overflow: hidden;
    scroll-margin-top: 100px;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    position: relative;
    display: inline-block;
    background: linear-gradient(90deg, var(--primary), var(--secondary), var(--primary));
    background-size: 200% auto;
    color: transparent;
    -webkit-background-clip: text;
    background-clip: text;
    animation: gradient-shift 3s linear infinite;
}

.section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 50%, rgba(52, 152, 219, 0.1) 0%, transparent 30%);
    z-index: -1;
    animation: float 15s infinite alternate ease-in-out;
}

@keyframes float {
    0% { transform: translate(0, 0); }
    50% { transform: translate(10%, 5%); }
    100% { transform: translate(-10%, -5%); }
}

.section-title:after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 4px;
    background: var(--primary);
    border-radius: 2px;
    box-shadow: 0 0 10px var(--primary), 0 0 20px var(--primary);
    animation: neon-pulse 2s infinite alternate;
}

/* Scroll Progress Bar */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    z-index: 10000;
    transition: width 0.1s ease;
    box-shadow: 0 2px 5px rgba(52, 152, 219, 0.5);
}

/* Header */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: var(--card-bg);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

header.scrolled {
    padding: 10px 0;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text);
}

.logo span {
    color: var(--primary);
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 30px;
}

.nav-links a {
    color: var(--text);
    font-weight: 500;
    position: relative;
}

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

.nav-links a:hover:after,
.nav-links a.active:after {
    width: 100%;
}

.nav-links a.active {
    color: var(--primary);
    font-weight: 600;
}

.theme-toggle, .language-toggle {
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.2rem;
    cursor: pointer;
    margin-left: 15px;
    transition: var(--transition);
}

.theme-toggle:hover, .language-toggle:hover {
    color: var(--primary);
    transform: scale(1.1);
}

/* Обеспечиваем отображение иконок Font Awesome */
i[class*="fa-"],
i[class*="fas"],
i[class*="far"],
i[class*="fab"] {
    display: inline-block;
    font-style: normal;
    font-variant: normal;
    text-rendering: auto;
    line-height: 1;
    pointer-events: auto;
}

@media print {
    @page {
        size: A4;
        margin: 1.5cm;
    }
    
    /* Скрываем ненужные элементы */
    .scroll-progress,
    .header-actions,
    .back-to-top,
    .preloader,
    .hamburger,
    .share-buttons,
    .view-counter,
    .nav-links,
    .footer-wave,
    .footer-social,
    .footer-links,
    .portfolio-filter,
    .skills-filter,
    .hero-btns,
    .social-links,
    .testimonials-slider,
    .testimonial-controls {
        display: none !important;
    }
    
    /* Основные стили для печати */
    body {
        background: white !important;
        color: #333 !important;
        font-size: 11pt;
        line-height: 1.6;
        font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    }
    
    /* Убираем фоны и тени */
    * {
        background: transparent !important;
        box-shadow: none !important;
        text-shadow: none !important;
    }
    
    /* Заголовки */
    h1 {
        color: #2c3e50 !important;
        font-size: 24pt;
        margin: 20px 0 15px 0;
        page-break-after: avoid;
        border-bottom: 2px solid #3498db;
        padding-bottom: 10px;
    }
    
    h2 {
        color: #34495e !important;
        font-size: 18pt;
        margin: 18px 0 12px 0;
        page-break-after: avoid;
        border-bottom: 1px solid #bdc3c7;
        padding-bottom: 8px;
    }
    
    h3 {
        color: #34495e !important;
        font-size: 14pt;
        margin: 15px 0 10px 0;
        page-break-after: avoid;
    }
    
    /* Секции */
    .section {
        page-break-inside: avoid;
        padding: 25px 0 !important;
        margin: 0 !important;
        border-bottom: 1px solid #ecf0f1;
    }
    
    .section:last-child {
        border-bottom: none;
    }
    
    /* Header для печати */
    header {
        position: static !important;
        background: white !important;
        box-shadow: none !important;
        padding: 15px 0 !important;
        border-bottom: 2px solid #3498db;
        margin-bottom: 20px;
    }
    
    .logo {
        color: #2c3e50 !important;
        font-size: 20pt;
    }
    
    .logo span {
        color: #3498db !important;
    }
    
    /* Hero секция */
    #hero {
        height: auto !important;
        background: white !important;
        padding: 30px 0 !important;
        page-break-after: always;
        border-bottom: 3px solid #3498db;
    }
    
    .hero-content {
        text-align: left !important;
    }
    
    .hero-content h1 {
        color: #2c3e50 !important;
        font-size: 28pt;
        margin-bottom: 15px;
    }
    
    .hero-content p {
        color: #555 !important;
        font-size: 12pt;
        line-height: 1.8;
    }
    
    .hero-img {
        max-width: 150px !important;
        border: 3px solid #3498db !important;
        border-radius: 50% !important;
    }
    
    /* Карточки и блоки */
    .about-content,
    .timeline-content,
    .education-card,
    .portfolio-item,
    .testimonial-slide,
    .certificate-item {
        background: white !important;
        border: 1px solid #ddd !important;
        box-shadow: none !important;
        page-break-inside: avoid;
        padding: 15px !important;
        margin-bottom: 15px !important;
    }
    
    .about-content {
        border-left: 4px solid #3498db !important;
    }
    
    .timeline-item {
        border-left: 3px solid #3498db !important;
        padding-left: 20px !important;
        margin-bottom: 20px !important;
    }
    
    .timeline-item::before {
        background: #3498db !important;
        border: 3px solid white !important;
    }
    
    .education-card {
        border-top: 3px solid #3498db !important;
    }
    
    /* Изображения */
    img {
        max-width: 100% !important;
        height: auto !important;
        page-break-inside: avoid;
        border: 1px solid #ddd !important;
    }
    
    /* Ссылки */
    a {
        color: #3498db !important;
        text-decoration: underline !important;
    }
    
    a[href^="http"]:after {
        content: " (" attr(href) ")";
        font-size: 0.85em;
        color: #7f8c8d;
    }
    
    /* Форма контактов */
    .contact-form {
        background: white !important;
        border: 2px solid #3498db !important;
        padding: 20px !important;
    }
    
    /* Footer */
    footer {
        background: white !important;
        color: #555 !important;
        border-top: 2px solid #3498db !important;
        page-break-inside: avoid;
        padding: 20px 0 !important;
        margin-top: 30px;
    }
    
    /* QR код */
    #qrcode {
        page-break-inside: avoid;
        border: 2px solid #3498db !important;
        padding: 10px !important;
        display: inline-block;
    }
    
    /* Убираем анимации */
    * {
        animation: none !important;
        transition: none !important;
    }
    
    /* Разрывы страниц */
    .section-title {
        page-break-after: avoid;
        color: #2c3e50 !important;
    }
    
    .section-title::after {
        background: #3498db !important;
    }
    
    /* Контейнер */
    .container {
        max-width: 100% !important;
        padding: 0 !important;
    }
    
    /* Улучшаем читаемость при печати */
    .about-text,
    .timeline-content,
    .education-card p,
    .testimonial-text {
        color: #444 !important;
        font-size: 11pt;
        line-height: 1.7;
    }
    
    /* Навыки */
    .skill-item {
        margin-bottom: 12px;
        page-break-inside: avoid;
    }
    
    .skill-bar {
        border: 1px solid #bdc3c7 !important;
        background: #ecf0f1 !important;
        height: 20px !important;
    }
    
    .skill-progress {
        background: #3498db !important;
        height: 100% !important;
    }
    
    .skill-name {
        color: #2c3e50 !important;
        font-weight: 600;
    }
    
    /* Статистика */
    .stats {
        display: grid !important;
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 15px;
    }
    
    .stat-item {
        border: 2px solid #3498db !important;
        background: white !important;
        padding: 15px !important;
        text-align: center;
    }
    
    .stat-number {
        color: #3498db !important;
        font-size: 24pt;
        font-weight: bold;
    }
    
    .stat-label {
        color: #555 !important;
    }
    
    /* Контакты */
    .contact-item {
        page-break-inside: avoid;
        padding: 10px 0;
        border-bottom: 1px dotted #bdc3c7;
    }
    
    .contact-item:last-child {
        border-bottom: none;
    }
    
    .contact-item i {
        color: #3498db !important;
    }
    
    /* Портфолио */
    .portfolio-grid {
        display: grid !important;
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 15px;
    }
    
    .portfolio-item {
        page-break-inside: avoid;
    }
    
    /* Сертификаты */
    .certificates-grid {
        display: grid !important;
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 15px;
    }
    
    /* Модальные окна не печатаем */
    .modal {
        display: none !important;
    }
    
    /* Технологии и теги */
    .tech-tag,
    .tag {
        background: #ecf0f1 !important;
        color: #2c3e50 !important;
        border: 1px solid #bdc3c7 !important;
        padding: 4px 8px;
        margin: 2px;
        display: inline-block;
    }
}

.hamburger {
    display: none;
    cursor: pointer;
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.5rem;
}

/* Hero Section */
#hero {
    height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.9), rgba(46, 204, 113, 0.8)), url('https://images.unsplash.com/photo-1499750310107-5fef28a66643?ixlib=rb-1.2.1&auto=format&fit=crop&w=1350&q=80') no-repeat center center/cover;
    color: white;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    animation: fadeInDown 1s ease;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    animation: fadeInUp 1s ease;
    min-height: 1.5em;
    position: relative;
}

.hero-content p.typing::after {
    content: '|';
    animation: blink 1s infinite;
    margin-left: 2px;
}

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

.hero-btns {
    display: flex;
    justify-content: center;
    gap: 20px;
    animation: fadeIn 1.5s ease;
}

.hero-btns .btn {
    animation: fadeInUp 1s ease;
}

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

.particle {
    position: absolute;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    pointer-events: none;
}

.social-links {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 20px;
}

.social-links a {
    color: white;
    font-size: 1.5rem;
    transition: var(--transition);
}

.social-links a:hover {
    transform: translateY(-5px);
    color: var(--secondary);
}

/* Share Buttons */
.share-buttons {
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 998;
}

@media (max-width: 768px) {
    .share-buttons {
        right: 10px;
        bottom: 100px;
        top: auto;
        transform: none;
    }
    
    .share-btn {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
    
    .view-counter {
        bottom: 80px;
        right: 10px;
        font-size: 0.8rem;
        padding: 8px 12px;
    }
    
    .certificates-grid {
        grid-template-columns: 1fr;
    }
    
    .qr-code-container {
        padding: 20px;
    }
    
    #qrCodeCanvas {
        max-width: 150px;
    }
}

.share-btn {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    border: none;
    background: var(--primary);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.share-btn:hover {
    transform: scale(1.1);
    background: var(--primary-dark);
}

.share-btn[data-platform="telegram"] {
    background: #0088cc;
}

.share-btn[data-platform="vk"] {
    background: #4C75A3;
}

.share-btn[data-platform="copy"] {
    background: var(--gray);
}

/* Certificates Section */
#certificates {
    background: var(--light);
}

.certificates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.certificate-item {
    background: var(--card-bg);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    opacity: 0;
    transform: translateY(30px);
}

.certificate-item.visible {
    opacity: 1;
    transform: translateY(0);
}

.certificate-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.certificate-img {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

.certificate-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.certificate-item:hover .certificate-img img {
    transform: scale(1.1);
}

.certificate-info {
    padding: 20px;
}

.certificate-info h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: var(--text);
}

.certificate-info p {
    color: var(--gray);
    font-size: 0.9rem;
}

/* QR Code Section */
#qrcode {
    background: var(--card-bg);
}

.qr-code-container {
    text-align: center;
    padding: 40px;
    background: var(--light);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.qr-code-wrapper {
    display: inline-block;
    padding: 20px;
    background: white;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

#qrCodeCanvas {
    max-width: 200px;
    height: auto;
}

/* View Counter */
.view-counter {
    position: fixed;
    bottom: 100px;
    right: 30px;
    background: var(--primary);
    color: white;
    padding: 10px 15px;
    border-radius: 25px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    box-shadow: var(--shadow);
    z-index: 997;
    transition: var(--transition);
}

.view-counter:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(52, 152, 219, 0.4);
}

.view-counter i {
    font-size: 1rem;
}

/* AOS-like animations */
[data-aos] {
    opacity: 0;
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos].aos-animate {
    opacity: 1;
}

[data-aos="fade-up"] {
    transform: translateY(30px);
}

[data-aos="fade-up"].aos-animate {
    transform: translateY(0);
}

[data-aos="zoom-in"] {
    transform: scale(0.8);
}

[data-aos="zoom-in"].aos-animate {
    transform: scale(1);
}

/* About Section */
#about {
    background: var(--card-bg);
}

.about-content {
    display: flex;
    align-items: center;
    gap: 50px;
    position: relative;
}

.about-img {
    flex: 1;
    position: relative;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.about-img img {
    width: 100%;
    height: auto;
    display: block;
    transition: var(--transition);
}

.about-img:hover img {
    transform: scale(1.05);
}

.about-text {
    flex: 1;
}

.about-text h3 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--primary);
}

.about-img::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        135deg,
        rgba(255, 255, 255, 0.1) 0%,
        rgba(255, 255, 255, 0) 20%,
        rgba(255, 255, 255, 0) 80%,
        rgba(255, 255, 255, 0.1) 100%
    );
    pointer-events: none;
    animation: hologram-scan 6s linear infinite;
}

@keyframes hologram-scan {
    0% { top: 100%; }
    100% { top: -100%; }
}

.skills {
    margin-top: 30px;
}

.skills-filter {
    margin-bottom: 20px;
}

.skill-filter-btn {
    padding: 8px 16px;
    background: var(--light);
    border: 2px solid var(--primary);
    color: var(--primary);
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
    font-size: 0.9rem;
}

.skill-filter-btn:hover,
.skill-filter-btn.active {
    background: var(--primary);
    color: white;
}

.skill-item {
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.skill-item.hidden {
    opacity: 0.3;
    transform: scale(0.95);
    pointer-events: none;
}

.skill-item {
    margin-bottom: 20px;
}

.skill-name {
    display: flex;
    justify-content: space-between;
    margin-bottom: 5px;
}

.skill-bar {
    height: 10px;
    background: var(--light);
    border-radius: 5px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: var(--primary);
    border-radius: 5px;
    transition: width 1.5s ease;
}

/* Experience Section */
#experience {
    background: var(--light);
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 0;
}

.timeline:before {
    content: '';
    position: absolute;
    width: 2px;
    background: var(--primary);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -1px;
}

.timeline-item {
    padding: 20px 40px;
    position: relative;
    width: 50%;
    box-sizing: border-box;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.timeline-item.visible {
    opacity: 1;
    transform: translateY(0);
}

.timeline-item:nth-child(odd) {
    left: 0;
}

.timeline-item:nth-child(even) {
    left: 50%;
}

.timeline-dot {
    position: absolute;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary);
    top: 30px;
    right: -8px;
    transition: var(--transition);
}

.timeline-item:nth-child(even) .timeline-dot {
    left: -8px;
}

.timeline-content {
    padding: 20px;
    background: var(--card-bg);
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.timeline-content:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.timeline-date {
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 10px;
}

.timeline-title {
    font-size: 1.3rem;
    margin-bottom: 10px;
}

/* Portfolio Section */
#portfolio {
    background: var(--card-bg);
}

.portfolio-filter {
    display: flex;
    justify-content: center;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 8px 20px;
    margin: 0 10px;
    background: none;
    border: none;
    color: var(--text);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border-radius: 4px;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.filter-btn.active, .filter-btn:hover {
    background: var(--primary);
    color: white;
    clip-path: circle(100% at 50% 50%);
}

.filter-btn::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary);
    z-index: -1;
    clip-path: circle(0% at 50% 50%);
    transition: clip-path 0.5s ease;
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.portfolio-item {
    transform-style: preserve-3d;
    transition: transform 0.5s ease, box-shadow 0.5s ease, opacity 0.6s ease;
    perspective: 1000px;
    position: relative;
    border-radius: 8px;
    overflow: hidden;
}

.portfolio-item:hover {
    transform: rotateY(10deg) rotateX(5deg) translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.portfolio-item:focus-within {
    outline: 2px solid var(--primary);
    outline-offset: 4px;
}

.portfolio-img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    display: block;
}

.portfolio-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(52, 152, 219, 0.9);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: var(--transition);
}

.portfolio-item:hover .portfolio-overlay {
    opacity: 1;
}

.portfolio-title {
    color: white;
    font-size: 1.5rem;
    margin-bottom: 10px;
    transform: translateY(20px);
    transition: var(--transition);
}

.portfolio-category {
    color: var(--light);
    transform: translateY(20px);
    transition: var(--transition);
}

.portfolio-item:hover .portfolio-title,
.portfolio-item:hover .portfolio-category {
    transform: translateY(0);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 1001;
    overflow-y: auto;
    padding: 20px;
    box-sizing: border-box;
}

.modal-content {
    background: var(--card-bg);
    max-width: 900px;
    margin: 50px auto;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    position: relative;
    animation: modalFadeIn 0.3s ease;
}

.close-modal {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 1.5rem;
    color: var(--text);
    cursor: pointer;
    transition: var(--transition);
}

.close-modal:hover {
    color: var(--primary);
    transform: rotate(90deg);
}

.modal-body {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.modal-img {
    width: 100%;
    max-height: 400px;
    object-fit: contain;
    border-radius: 8px;
}

.modal-text {
    margin-top: 20px;
}

.modal-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 15px;
}

.tech-tag {
    background: var(--primary);
    color: white;
    padding: 5px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
}

/* Testimonials Section */
#testimonials {
    background: var(--light);
}

.testimonials-container {
    max-width: 800px;
    margin: 0 auto;
}

.testimonial-slide {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin: 20px;
    text-align: center;
    transition: var(--transition), opacity 0.6s ease, transform 0.6s ease;
}

.testimonial-slide:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.testimonial-text {
    font-style: italic;
    margin-bottom: 20px;
    position: relative;
}

.testimonial-text:before,
.testimonial-text:after {
    content: '"';
    font-size: 3rem;
    color: var(--primary);
    opacity: 0.3;
    position: absolute;
}

.testimonial-text:before {
    top: -20px;
    left: -10px;
}

.testimonial-text:after {
    bottom: -40px;
    right: -10px;
}

.testimonial-author {
    display: flex;
    align-items: center;
    justify-content: center;
}

.author-img {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    overflow: hidden;
    margin-right: 15px;
}

.author-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.author-info h4 {
    margin-bottom: 5px;
}

.author-info p {
    color: var(--gray);
    font-size: 0.9rem;
}

/* Education Section */
#education {
    background: var(--card-bg);
}

.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.education-card {
    background: var(--light);
    border-radius: 8px;
    padding: 25px;
    box-shadow: var(--shadow);
    transform-style: preserve-3d;
    transform: perspective(1000px);
    transition: transform 0.5s ease, box-shadow 0.5s ease, opacity 0.6s ease;
}

.education-card:hover {
    transform: perspective(1000px) rotateX(5deg) rotateY(5deg) translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.education-date {
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 10px;
}

.education-title {
    font-size: 1.3rem;
    margin-bottom: 10px;
}

/* Contact Section */
#contact {
    background: var(--card-bg);
}

.contact-container {
    display: flex;
    gap: 50px;
}

.contact-info {
    flex: 1;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 30px;
}

.contact-icon {
    transition: all 0.3s ease;
    font-size: 1.5rem;
    color: var(--primary);
    margin-right: 20px;
    margin-top: 5px;
}

.contact-item:hover .contact-icon {
    transform: scale(1.2) rotate(15deg);
    color: var(--secondary);
}

.contact-form {
    flex: 1;
    background: var(--light);
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.form-group {
    margin-bottom: 20px;
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: inherit;
    transition: var(--transition);
    background: var(--card-bg);
    color: var(--text);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

.form-control:invalid:not(:placeholder-shown) {
    border-color: var(--danger);
}

.form-control:valid:not(:placeholder-shown) {
    border-color: var(--secondary);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

textarea.form-control {
    min-height: 150px;
    resize: vertical;
}

/* Footer */
footer {
    background: var(--footer-bg);
    color: white;
    padding: 50px 0 20px;
    text-align: center;
    position: relative;
}

.footer-logo {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.footer-logo span {
    color: var(--primary);
}

.footer-links {
    display: flex;
    justify-content: center;
    list-style: none;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.footer-links li {
    margin: 0 15px;
}

.footer-links a {
    color: white;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-social {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 30px;
}

.footer-social a {
    color: white;
    font-size: 1.5rem;
    transition: var(--transition);
}

.footer-social a:hover {
    color: var(--primary);
    transform: translateY(-5px);
}

.footer-wave {
    position: absolute;
    top: -50px;
    left: 0;
    width: 100%;
    height: 50px;
    transform: rotate(180deg);
}

.footer-wave path {
    fill: var(--footer-bg);
}

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

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

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

.back-to-top.active {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-5px);
}

/* Stats Section */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 40px;
}

.stat-item {
    text-align: center;
    padding: 30px;
    background: var(--light);
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 10px;
}

.stat-text {
    font-size: 1rem;
    color: var(--text);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

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

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

@keyframes modalFadeIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes neon-pulse {
    from {
        box-shadow: 0 0 10px var(--primary), 0 0 20px var(--primary);
    }
    to {
        box-shadow: 0 0 15px var(--primary), 0 0 30px var(--primary), 0 0 45px var(--primary);
    }
}

/* Smooth transitions for theme changes */
* {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* Focus styles for accessibility */
a:focus,
button:focus,
input:focus,
textarea:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Skip to main content link for screen readers */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary);
    color: white;
    padding: 8px;
    text-decoration: none;
    z-index: 10000;
}

.skip-link:focus {
    top: 0;
}

/* Responsive Styles */
@media (max-width: 992px) {
    .about-content {
        flex-direction: column;
    }

    .timeline:before {
        left: 30px;
    }

    .timeline-item {
        width: 100%;
        padding-left: 70px;
        padding-right: 0;
    }

    .timeline-item:nth-child(even) {
        left: 0;
    }

    .timeline-dot {
        left: 22px;
    }

    .contact-container {
        flex-direction: column;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background: var(--card-bg);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        transition: var(--transition);
    }

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

    .nav-links li {
        margin: 15px 0;
    }

    .hamburger {
        display: block;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .section-title {
        position: relative;
        display: inline-block;
    }

    .portfolio-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }

    .education-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-btns {
        flex-direction: column;
        gap: 15px;
    }

    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .stats {
        grid-template-columns: 1fr;
    }
}