/* Header */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 70px;

    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 24px;
    box-sizing: border-box;

    background: rgba(0, 0, 0, 0);
    backdrop-filter: blur(0px);

    z-index: 100;

    transition:
        background 0.3s ease,
        backdrop-filter 0.3s ease;
    pointer-events: none;
}

.site-header.scrolled {
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(12px);
    pointer-events: auto;
}

.header-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    overflow: hidden;
    flex-shrink: 0;

    opacity: 0;
    transform: scale(0.5);
    transition:
        opacity 0.3s ease,
        transform 0.3s ease;
}

.header-avatar.visible {
    opacity: 1;
    transform: scale(1);
}

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

.header-title {
    color: #fff;
    font-weight: 600;
    font-size: 16px;
    opacity: 0;
    transform: translateX(-10px);
    transition:
        opacity 0.3s ease,
        transform 0.3s ease;
}

.header-title.visible {
    opacity: 1;
    transform: translateX(0);
}

/* Hero */
.hero-wrapper {
    position: fixed;
    top: 25%;
    left: 50%;
    z-index: 10; /* було 50 — занизь, щоб не перекривало */

    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;

    transform: translate(-50%, 0)
        translateY(calc(var(--scroll-progress) * -25vh))
        scale(calc(1 - var(--scroll-progress) * 0.85));
    transform-origin: top center;

    opacity: calc(1 - var(--scroll-progress) * 1.1);

    pointer-events: none;
    will-change: transform, opacity;
}

.usr-icon {
    width: 500px;
    height: 500px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: box-shadow 0.3s ease;
    animation: icon-appear 0.8s ease-out;
}

.usr-icon img {
    width: 450px;
    height: 450px;
    object-fit: cover;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.1);
}

@keyframes icon-appear {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Arrow */
.arrow-down {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;

    opacity: calc(0.6 * (1 - var(--scroll-progress) * 3));

    animation:
        icon-appear 0.8s ease-out,
        arrow-bounce 1.8s ease-in-out 0.8s infinite;
}

.arrow-down img {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 0 6px rgba(255, 255, 255, 0.15));
}

@keyframes arrow-bounce {
    0%,
    100% {
        transform: translateY(0);
        opacity: 0.4;
    }
    50% {
        transform: translateY(12px);
        opacity: 1;
    }
}

/* Content */

.content {
    position: relative;
    z-index: 20; /* завжди вище hero */
    width: 100%;
    min-height: 100vh;
    margin-top: 100vh;
    padding: 60px 20px;
    box-sizing: border-box;
    background: #0a0a0a; /* підстраховка, щоб фото не просвічувало під контентом */
}

.content section {
    max-width: 900px;
    margin: 0 auto 100px;
    padding: 0 24px;
    opacity: 0;
    transform: translateY(30px);
    transition:
        opacity 0.6s ease,
        transform 0.6s ease;
}

.content section.in-view {
    opacity: 1;
    transform: translateY(0);
}

.content h2 {
    color: #fff;
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 24px;
    position: relative;
    padding-left: 16px;
}

.content h2::before {
    content: "";
    position: absolute;
    left: 0;
    top: 4px;
    bottom: 4px;
    width: 4px;
    background: linear-gradient(180deg, #ff6b6b, #a855f7);
    border-radius: 2px;
}

/* --- About --- */
.about p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 18px;
    line-height: 1.6;
}

/* --- Stack --- */
.stack-icons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.stack-icons img {
    width: 56px;
    height: 56px;
    padding: 12px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 14px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    transition:
        transform 0.25s ease,
        background 0.25s ease,
        border-color 0.25s ease;
}

.stack-icons img:hover {
    transform: translateY(-6px) scale(1.05);
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

/* --- Projects --- */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.project-card {
    display: block;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    padding: 24px;
    text-decoration: none;
    transition:
        transform 0.25s ease,
        background 0.25s ease,
        border-color 0.25s ease,
        box-shadow 0.25s ease;
}

.project-card:hover {
    transform: translateY(-6px);
    background: rgba(255, 255, 255, 0.07);
    border-color: rgba(168, 85, 247, 0.4);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
}

.project-card h3 {
    color: #fff;
    font-size: 18px;
    margin: 0 0 8px;
}

.project-card p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
    line-height: 1.5;
    margin: 0 0 16px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.project-meta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.project-meta span {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.5);
    background: rgba(255, 255, 255, 0.06);
    padding: 4px 10px;
    border-radius: 20px;
}

.projects-loading {
    color: rgba(255, 255, 255, 0.4);
    font-size: 14px;
}

/* --- GitHub stats --- */
.github-stats-custom {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
    width: 100%;
}

.stat-card {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    transition:
        transform 0.25s ease,
        background 0.25s ease,
        border-color 0.25s ease;
}

.stat-card:hover {
    transform: translateY(-4px);
    background: rgba(255, 255, 255, 0.07);
    border-color: rgba(168, 85, 247, 0.3);
}

.stat-number {
    color: #fff;
    font-size: 32px;
    font-weight: 700;
}

.stat-label {
    color: rgba(255, 255, 255, 0.5);
    font-size: 13px;
}

.lang-card {
    grid-column: span 2;
}

.lang-bars {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 8px;
}

.lang-bar span {
    color: rgba(255, 255, 255, 0.7);
    font-size: 13px;
}

.lang-bar-track {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 3px;
    margin-top: 4px;
}

.lang-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, #ff6b6b, #a855f7);
    border-radius: 3px;
    transition: width 0.6s ease;
}

/* --- Contact --- */
.contact-links {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.contact-links a {
    color: #fff;
    text-decoration: none;
    padding: 12px 24px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 30px;
    font-weight: 500;
    transition:
        background 0.25s ease,
        transform 0.25s ease,
        border-color 0.25s ease;
}

.contact-links a:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(168, 85, 247, 0.5);
    transform: translateY(-3px);
}

/* ============================= */
/* Tablet (≤ 1024px) */
/* ============================= */
@media (max-width: 1024px) {
    .usr-icon {
        width: 380px;
        height: 380px;
    }

    .usr-icon img {
        width: 340px;
        height: 340px;
    }

    .usr-icon:hover {
        width: 400px;
        height: 400px;
    }

    .usr-icon:hover img {
        width: 360px;
        height: 360px;
    }

    .content section {
        max-width: 100%;
    }

    .lang-card {
        grid-column: span 2;
    }

    .github-stats-custom {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ============================= */
/* Mobile (≤ 768px) */
/* ============================= */
@media (max-width: 768px) {
    .site-header {
        height: 60px;
        padding: 0 16px;
        gap: 10px;
    }

    .header-avatar {
        width: 32px;
        height: 32px;
    }

    .header-title {
        font-size: 14px;
    }

    /* Hero */
    .hero-wrapper {
        top: 20%;
        gap: 16px;
    }

    .usr-icon {
        width: 240px;
        height: 240px;
    }

    .usr-icon img {
        width: 210px;
        height: 210px;
    }

    .usr-icon:hover {
        width: 240px;
        height: 240px;
    }

    .usr-icon:hover img {
        width: 210px;
        height: 210px;
    }

    .arrow-down {
        width: 28px;
        height: 28px;
    }

    /* Content */
    .content {
        padding: 40px 16px;
    }

    .content section {
        margin: 0 auto 60px;
        padding: 0 8px;
    }

    .content h2 {
        font-size: 22px;
        margin-bottom: 18px;
    }

    .about p {
        font-size: 16px;
    }

    /* Stack icons */
    .stack-icons img {
        width: 44px;
        height: 44px;
        padding: 8px;
    }

    /* Projects */
    .projects-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .project-card {
        padding: 18px;
    }

    .project-card h3 {
        font-size: 16px;
    }

    .project-card p {
        font-size: 13px;
    }

    /* GitHub stats */
    .github-stats-custom {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }

    .stat-card {
        padding: 16px;
    }

    .stat-number {
        font-size: 26px;
    }

    .lang-card {
        grid-column: span 2;
    }

    /* Contact */
    .contact-links {
        flex-direction: column;
        gap: 12px;
    }

    .contact-links a {
        text-align: center;
    }
}

/* ============================= */
/* Small Mobile (≤ 420px) */
/* ============================= */
@media (max-width: 420px) {
    .usr-icon {
        width: 180px;
        height: 180px;
    }

    .usr-icon img {
        width: 155px;
        height: 155px;
    }

    .usr-icon:hover {
        width: 180px;
        height: 180px;
    }

    .usr-icon:hover img {
        width: 155px;
        height: 155px;
    }

    .header-title {
        font-size: 13px;
    }

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

    .lang-card {
        grid-column: span 1;
    }

    .stat-number {
        font-size: 24px;
    }
}

@media (hover: none) {
    .usr-icon:hover,
    .project-card:hover,
    .stat-card:hover,
    .stack-icons img:hover,
    .contact-links a:hover {
        transform: none;
        box-shadow: none;
        background: inherit;
        border-color: inherit;
    }
}