* {
    box-sizing: border-box;
    text-decoration: none;
    color: white;
    padding: 0;
    margin: 0;
    list-style-type: none;
}

:root {
    --border-32: 32px;
    --border-16: 16px;
    --border-24: 24px;
    --border-8: 8px;

    --FontTitle: 2.5rem;
    --FontHeading: 2rem;
    --FontText: 1.5rem;

    --FontNunitoSans: "Nunito Sans", sans-serif;
    --FontRubik: "Rubik", sans-serif;
    --FontNotoSans: "Noto Sans", sans-serif;
    --FontMulish: "Mulish", sans-serif;

    --bg-color: rgb(11, 11, 11, 0.80);
}

h2 {
    margin-bottom: 0.5rem;
    font-size: var(--FontHeading);
    font-family: var(--FontNunitoSans);
    border-bottom: 2px solid white;
    display: inline-block;
    width: fit-content;
}

p, li, a {
    font-size: var(--FontText);
    font-family: var(--FontMulish);
}

.main {
    display: flex;
    flex-direction: column;
    gap: 20px;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.back-video {
    position: relative;
}

.main-window {
    padding: 2rem 3rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    border-radius: var(--border-32);
    border: 3px solid white;
    background-color: var(--bg-color);
}

.bio-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    border-color: white;
}

.title {
    font-size: var(--FontTitle);
    font-weight: 700;
    font-family: var(--FontNunitoSans);

    letter-spacing: 1px;
    text-align: center;
    margin-bottom: 2rem;
}

.bio-projects {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 3rem;
}

.self-photo {
    border-radius: var(--border-16);
    height: 30vh;
    border: 3px solid white;
}

.bio-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.about,
.bio-stack,
.projects-container {
    display: flex;
    flex-direction: column;
}

.bio-line {
    letter-spacing: 0.3px;
    border-left: 2px solid grey;
    padding-left: 12px;
    font-style: italic;
}

.bio-activity {
    display: flex;
    gap: 2rem;
}

.stack-list,
.projects-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.project-link {
    position: relative;
    display: inline-block;
    width: fit-content;
}

.project-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: white;
    transition: width 0.3s ease;
}

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

.add-window {
    display: flex;
    gap: 16px;
    padding: 0.75rem 1.75rem;
    border-radius: var(--border-16);
    border: 3px solid white;
    background-color: var(--bg-color);
}

.social-link {
    height: 3vw;
    background-color: white;
    border: 1px solid white;
    border-radius: 100%;
    transition: all 0.3s ease-in-out;
    filter: brightness(1); 
}

.social-link:hover {
    transform: scale(1.15);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.4);
    border-color: rgba(255, 255, 255, 0.8);
}

.social-link:active {
    transform: scale(0.95);
}

.video-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: -1;
}

.video-bg video {
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    object-fit: cover;
}











/* ===== АДАПТИВНОСТЬ ===== */

/* Большие десктопы (1920px и выше) */
@media screen and (min-width: 1920px) {
    :root {
        --FontTitle: 3rem;
        --FontHeading: 2.2rem;
        --FontText: 1.6rem;
    }
    
    .main-window {
        max-width: 1000px;
        padding: 2.5rem 4rem;
    }
    
    .self-photo {
        height: 28vh;
    }
}

/* Средние десктопы и ноутбуки (1280px - 1536px) */
@media screen and (max-width: 1536px) and (min-width: 1281px) {
    .main-window {
        max-width: 750px;
        padding: 2rem 2.5rem;
    }
    
    .bio-projects {
        gap: 2rem;
    }

    .self-photo {
        height: 27vh;
    }

    .social-link {
        height: 4vw;
    }
}

/* Маленькие ноутбуки и планшеты в landscape (1024px - 1280px) */
@media screen and (max-width: 1280px) and (min-width: 1025px) {
    :root {
        --FontTitle: 2.2rem;
        --FontHeading: 1.8rem;
        --FontText: 1.3rem;
    }
    
    .main-window {
        max-width: 700px;
        height: auto;
    }
    
    .bio-projects {
        gap: 1.5rem;
    }
    
    .self-photo {
        height: 24vh;
    }

    .social-link {
        height: 4.75vw;
    }
}

/* Планшеты (768px - 1024px) */
@media screen and (max-width: 1024px) and (min-width: 768px) {
    :root {
        --FontTitle: 2rem;
        --FontHeading: 1.6rem;
        --FontText: 1.2rem;
    }
    
    .main {
        gap: 15px;
        padding: 20px;
        height: auto;
        min-height: 100vh;
        justify-content: center;
    }
    
    .main-window {
        max-width: 90%;
        height: auto;
        padding: 1.5rem;
    }
    
    .bio-projects {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .self-photo {
        height: 20vh;
    }
    
    .bio-info {
        width: 100%;
    }
    
    .bio-activity {
        gap: 2rem;
        justify-content: space-between;
    }
    
    .add-window {
        padding: 0.75rem 1.5rem;
    }
    
    .social-link {
        height: 5.5vw;
    }
}

/* Большие телефоны и маленькие планшеты (481px - 767px) */
@media screen and (max-width: 767px) and (min-width: 481px) {
    :root {
        --FontTitle: 1.8rem;
        --FontHeading: 1.5rem;
        --FontText: 1.1rem;
    }
    
    .main {
        gap: 15px;
        padding: 15px;
        height: auto;
        min-height: 100vh;
        justify-content: center;
    }
    
    .main-window {
        max-width: 95%;
        height: auto;
        padding: 1.2rem;
    }
    
    .title {
        margin-bottom: 1.2rem;
    }
    
    .bio-projects {
        flex-direction: column;
        gap: 1.2rem;
    }
    
    .self-photo {
        height: 20vh;
    }
    
    .bio-info {
        width: 100%;
    }
    
    .bio-activity {
        flex-direction: column;
        gap: 1.2rem;
    }
    
    .bio-stack, .projects-container {
        width: 100%;
    }
    
    .stack-list, .projects-list {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 8px;
    }
    
    .project-link {
        padding: 4px 12px;
        background: rgba(255, 255, 255, 0.05);
        border-radius: 20px;
    }
    
    .add-window {
        padding: 0.6rem 1.2rem;
    }
    
    .social-link {
        height: 7vw;
    }
}

/* Маленькие телефоны (320px - 480px) */
@media screen and (max-width: 480px) {
    :root {
        --FontTitle: 1.5rem;
        --FontHeading: 1.3rem;
        --FontText: 1rem;
        --border-32: 24px;
        --border-16: 12px;
    }
    
    .main {
        gap: 10px;
        padding: 10px;
        height: auto;
        min-height: 100vh;
        justify-content: center;
    }
    
    .main-window {
        max-width: 100%;
        height: auto;
        padding: 1rem;
        border-width: 2px;
    }
    
    .title {
        margin-bottom: 1rem;
        letter-spacing: 0.5px;
    }
    
    .bio-projects {
        flex-direction: column;
        gap: 1rem;
    }
    
    .self-photo {
        height: 18vh;
        border-width: 2px;
    }
    
    .bio-info {
        width: 100%;
    }
    
    .bio-line {
        padding-left: 8px;
        font-size: 0.95rem;
    }
    
    .bio-activity {
        flex-direction: column;
        gap: 1rem;
    }
    
    .bio-stack, .projects-container {
        width: 100%;
    }
    
    h2 {
        margin-bottom: 0.3rem;
        border-bottom-width: 1px;
    }
    
    .stack-list, .projects-list {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 6px;
    }
    
    .stack-list li, .project-link {
        font-size: 0.9rem;
        padding: 3px 10px;
        background: rgba(255, 255, 255, 0.05);
        border-radius: 16px;
    }
    
    .project-link {
        width: auto;
    }
    
    .add-window {
        gap: 12px;
        padding: 0.5rem 1rem;
        border-width: 2px;
    }
    
    .social-link {
        height: 10vw;
    }
}

/* Для очень больших экранов (4K и выше) */
@media screen and (min-width: 2560px) {
    :root {
        --FontTitle: 4rem;
        --FontHeading: 2.8rem;
        --FontText: 2rem;
    }
    
    .main-window {
        max-width: 1400px;
        padding: 3rem 5rem;
    }
    
    .self-photo {
        height: 40vh;
    }
    
    .add-window {
        padding: 1rem 2.5rem;
    }
    
    .social-link {
        height: 6vh;
    }
}


/* ===== ПЛАВНЫЕ ПЕРЕХОДЫ ===== */

.main-window,
.self-photo,
.add-window,
.social-link,
h1, h2, p, li, a {
    transition: all 0.25s ease;
}

.bio-projects,
.bio-activity {
    transition: 
        flex-direction 0.3s ease,
        gap 0.3s ease;
}

.video-bg,
.video-bg video {
    transition: none;
}

.project-link::after {
    transition: width 0.3s ease;
}

.social-link:hover {
    transition: all 0.2s ease-in-out;
}