:root {
    --color-background: #0D1117;
    --color-text: #C9D1D9;
    --color-primary: #58A6FF;
    --color-secondary: #79C0FF;
    --color-surface: #161B22;
    --color-border: #30363D;
    --font-main: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--color-background);
    color: var(--color-text);
    line-height: 1.6;
}

.main-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: rgba(13, 17, 23, 0.95); 
    backdrop-filter: blur(5px); 
    padding: 15px 0;
    border-bottom: 1px solid var(--color-border);
}

nav {
    display: flex;
    justify-content: center;
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-link {
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
    padding: 5px 10px;
    transition: color 0.3s;
}

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

.main-header nav a.nav-link:first-child {
    /* Делаем ссылку "Назад" похожей на кнопку */
    display: inline-flex;
    align-items: center;
    gap: 5px;
    
    padding: 8px 15px;
    border-radius: 6px;
    
    /* Стили, имитирующие легкую кнопку */
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-primary);
    font-weight: 600;
    
    transition: background-color 0.3s, border-color 0.3s, transform 0.3s;
}

.main-header nav a.nav-link:first-child:hover {
    border-color: var(--color-secondary);
    color: var(--color-secondary);
    background-color: rgba(255, 171, 145, 0.1); /* Легкий фон при наведении */
    transform: translateY(-1px);
}

/* Убедимся, что другие навигационные ссылки выглядят как обычный текст, а не как кнопки */
.main-header nav a.nav-link:not(:first-child) {
    padding: 8px 10px;
    background-color: transparent;
    border: none;
    font-weight: 400;
    color: var(--color-text);
}

.main-header nav a.nav-link:not(:first-child):hover {
    color: var(--color-primary);
}

.language-switcher {
    display: flex;
    align-items: center;
    font-size: 0.9em;
    margin-left: 30px;
}

.lang-btn {
    cursor: pointer;
    transition: color 0.2s;
    font-weight: 600;
    color: #7D8590;
}

.lang-btn.active {
    color: var(--color-primary);
}

.lang-btn:not(.active):hover {
    color: var(--color-text);
}

.separator {
    margin: 0 5px;
    color: #30363D;
}

.contact-links {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 10px 15px;
    border-radius: 6px;
    background-color: var(--color-surface);
    color: var(--color-text);
    text-decoration: none;
    border: 1px solid var(--color-border);
    transition: background-color 0.3s, border-color 0.3s;
    font-weight: 500;
}

.contact-link:hover {
    background-color: #1E2127;
    border-color: var(--color-primary);
}

.contact-link .icon {
    font-size: 1.1em;
}

.container {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
}

.section {
    padding: 30px 0;
    border-bottom: 1px solid var(--color-border);
}

.section:last-child {
    border-bottom: none;
}

h1, h2, h3, h4 {
    font-weight: 700;
}

h2 {
    font-size: 2.2em;
    margin-bottom: 40px;
    color: var(--color-secondary);
}

.about-me {
    text-align: center;
    padding-top: 25px;
    padding-bottom: 100px;
}

.profile-photo {
    width: 275px;
    height: 275px;
    /* border-radius: 50%; */
    object-fit: cover;
    border: 1px solid var(--color-primary);
    margin-bottom: 25px;
}

.about-me h1 {
    font-size: 3.5em;
    margin-bottom: 10px;
}

.about-me h2 {
    font-size: 1.5em;
    color: #909090;
    margin-bottom: 20px;
    border-bottom: none;
}

.tagline {
    max-width: 650px;
    margin: 0 auto 30px auto;
    font-size: 1.15em;
    color: #A0A0A0;
}

.btn {
    display: inline-block;
    padding: 12px 25px;
    margin: 5px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
    border: 2px solid transparent;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-background); 
}
.btn-primary:hover {
    background-color: #388BFD;
}

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

.experience-link-card {
    display: block;
    background-color: var(--color-surface);
    padding: 25px;
    border-radius: 10px;
    margin-bottom: 30px;
    border: 1px solid var(--color-border);
    border-left: 5px solid var(--color-secondary);
    text-decoration: none;
    color: var(--color-text);
    transition: border-color 0.3s, transform 0.3s;
}

.experience-link-card:hover {
    transform: translateY(-3px);
    border-color: var(--color-primary);
}

.job-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 10px;
    padding-bottom: 10px;
    border-bottom: 1px dotted var(--color-border);
}

.experience-link-card h3 {
    font-size: 1.5em;
    color: white;
}

.company-name {
    font-size: 1.1em;
    font-weight: 600;
    color: var(--color-text);
}

.duration {
    color: #7D8590;
    font-style: italic;
}

@media (max-width: 700px) {
    .job-header {
        flex-direction: column;
        align-items: flex-start;
    }
    .company-name {
        margin: 5px 0;
    }
}

.section-description {
    margin-bottom: 40px;
    color: #A0A0A0;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.project-card {
    background-color: var(--color-surface);
    padding: 25px;
    border-radius: 10px;
    text-decoration: none;
    color: var(--color-text);
    display: block;
    transition: transform 0.3s, background-color 0.3s, border-color 0.3s;
    border: 1px solid var(--color-border);
}

.project-card:hover {
    transform: translateY(-5px);
    background-color: #1E2127;
    border-color: var(--color-primary);
}

.project-card h4 {
    color: var(--color-secondary);
    font-size: 1.4em;
    margin-bottom: 5px;
}

.tech-stack {
    display: block;
    font-size: 0.85em;
    color: #7D8590;
    margin-bottom: 15px;
}

footer {
    text-align: center;
    padding: 30px 0;
    border-top: 1px solid var(--color-border);
    font-size: 0.9em;
    color: #7D8590;
}

@media (max-width: 700px) {
    .main-header {
        padding: 10px 0;
    }
    nav {
        gap: 15px;
    }
    .section {
        padding: 50px 0;
    }
    .about-me h1 {
        font-size: 2.5em;
    }
    .about-me h2 {
        font-size: 1.3em;
    }
    .job-header {
        flex-direction: column;
        align-items: flex-start;
    }
    .btn {
        display: block;
        width: 100%;
    }
}

.project-image {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 15px;
    display: block;
    border: 1px solid var(--color-border);
    transition: border-color 0.5s ease-in-out;
}

body:not(.theme-light) .project-image {
    opacity: 0.9;
}

body.theme-light .project-image {
    opacity: 1;
}

.project-card:hover .project-image {
    border-color: var(--color-primary);
}

.project-meta {
    margin-bottom: 10px;
}

/* --- 9.1 Секция Навыков (Улучшенный Спойлер с разделителями) --- */
.skills-section {
    margin-top: 40px;
    background-color: var(--color-surface);
    border-radius: 10px;
    padding: 20px;
    border: 1px solid var(--color-border);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease-in-out;
}

.skills-toggle {
    width: 100%;
    padding: 15px;
    background-color: transparent;
    border: none;
    font-size: 1.1em;
    font-weight: 600;
    color: var(--color-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: color 0.3s, transform 0.3s;
    position: relative;
}

.skills-toggle::before {
    content: '';
    position: absolute;
    top: -1px;
    left: -1px;
    right: -1px;
    height: 2px;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease-in-out;
}

.skills-toggle:hover {
    color: var(--color-secondary);
    transform: translateY(-2px);
}

.skills-toggle:hover::before {
    transform: scaleX(1);
}

.skills-toggle .toggle-icon {
    font-size: 1.5em;
    transition: transform 0.3s ease-in-out;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--color-primary);
    color: var(--color-background);
}

.skills-toggle.expanded .toggle-icon {
    transform: rotate(45deg);
    background-color: var(--color-secondary);
}

.skills-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease-in-out;
    border-top: 1px solid var(--color-border);
    padding-top: 20px;
    margin-top: 15px;
}

.skills-content.expanded {
    max-height: 800px;
}

.skill-category {
    margin-bottom: 25px;
}

.skill-category h3 {
    font-size: 1.2em;
    margin-bottom: 15px;
    color: var(--color-text);
    padding-left: 10px;
    border-left: 3px solid var(--color-primary);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.skill-tag {
    padding: 8px 15px;
    background-color: var(--color-primary);
    color: var(--color-background);
    border-radius: 20px;
    font-size: 0.85em;
    font-weight: 500;
    border: 1px solid var(--color-primary);
    transition: background-color 0.3s, color 0.3s, border-color 0.3s, transform 0.3s;
}

.skill-tag:hover {
    background-color: var(--color-secondary);
    border-color: var(--color-secondary);
    color: var(--color-background);
    transform: translateY(-2px);
}

/* --- 9.2 Разделитель между категориями навыков --- */
.skill-category:not(:last-child) {
    border-bottom: 1px dashed var(--color-border);
    padding-bottom: 25px;
}

/* Адаптация для светлой темы */
body.theme-light .skills-section {
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}
body.theme-light .skill-tag {
    background-color: var(--color-primary);
    color: var(--color-background);
    border-color: var(--color-primary);
}
body.theme-light .skill-tag:hover {
    background-color: var(--color-secondary);
    border-color: var(--color-secondary);
}

/* Анимация при раскрытии контента */
.skills-content.expanded {
    animation: slideDown 0.5s ease-in-out;
}

@keyframes slideDown {
    0% {
        opacity: 0;
        transform: translateY(-10px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Адаптивность */
@media (max-width: 700px) {
    .skill-tags {
        justify-content: center;
    }
}

/* --- 10. Карусель Проектов --- */
.image-carousel {
    position: relative;
    margin-bottom: 30px;
    border-radius: 10px;
    overflow: hidden; /* Скрываем все, что выходит за рамки */
    border: 1px solid var(--color-border);
    transition: border-color 0.5s;
}

.carousel-track {
    display: flex;
    width: 100%;
    transition: transform 0.4s ease-in-out;
}

.carousel-slide {
    min-width: 100%; /* Каждый слайд занимает всю видимую область */
    flex-shrink: 0;
}

.carousel-slide img {
    width: 100%;
    height: auto;
    max-height: 700px; /* Ограничение высоты для всех слайдов */
    display: block;
    object-fit: cover;
}

/* Кнопки навигации (стрелки) */
.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(0, 0, 0, 0.5);
    color: white;
    border: none;
    padding: 15px 10px;
    cursor: pointer;
    z-index: 10;
    font-size: 1.5em;
    opacity: 0.8;
    transition: background-color 0.3s, opacity 0.3s;
}

.carousel-btn:hover {
    opacity: 1;
    background-color: rgba(0, 0, 0, 0.8);
}

.carousel-btn.prev {
    left: 0;
    border-radius: 0 8px 8px 0;
}
.carousel-btn.next {
    right: 0;
    border-radius: 8px 0 0 8px;
}

/* Точки навигации (индикаторы) */
.carousel-dots {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
    z-index: 10;
}

.dot {
    width: 10px;
    height: 10px;
    background-color: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.3s;
}

.dot.active {
    background-color: white;
    transform: scale(1.2);
}

/* Стилизация для светлой темы */
body.theme-light .carousel-btn {
    background-color: rgba(255, 255, 255, 0.7);
    color: var(--color-text);
}
body.theme-light .carousel-btn:hover {
    background-color: rgba(255, 255, 255, 0.9);
}
body.theme-light .dot.active {
    background-color: var(--color-primary);
    transform: scale(1.2);
}


/* --- 11. Стили для Страницы Опыта Работы --- */
.experience-entry {
    padding: 25px;
    margin-bottom: 30px;
    border-radius: 10px;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease-in-out;
}
.experience-entry:hover {
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
    border-color: var(--color-border-hover, #ccc); /* Может потребоваться настройка hover границы */
}
.job-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 10px;
    border-bottom: 2px solid var(--color-primary);
    padding-bottom: 5px;
}
.job-header h2 {
    font-size: 1.6em;
    margin: 0;
    color: var(--color-primary);
}
.job-dates {
    color: var(--color-secondary);
    font-style: italic;
    font-size: 0.95em;
}
.job-title {
    font-size: 1.1em;
    margin-top: 5px;
    margin-bottom: 15px;
    color: var(--color-text);
}
.responsibilities h3 {
    font-size: 1.05em;
    color: var(--color-text);
    margin-top: 0;
    margin-bottom: 15px;
}
.responsibilities ul {
    list-style: none;
    padding-left: 0;
}
.responsibilities li {
    margin-bottom: 12px;
    position: relative;
    padding-left: 25px;
    line-height: 1.5;
}
.responsibilities li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
    font-size: 0.9em;
}