/* Critical CSS for above-the-fold content */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Optimize paint and layout */
body {
    will-change: background-image;
    contain: layout style paint;
}

.container {
    contain: layout style;
}

.avatar-wrap {
    contain: layout style paint;
    will-change: transform;
}

:root {
    --text: #ffffff;
    --surface: rgba(255, 255, 255, 0.1);
    --surface-hover: rgba(255, 255, 255, 0.2);
    --border: rgba(255, 255, 255, 0.22);
    --border-hover: rgba(255, 255, 255, 0.35);
    --radius: 16px;
    --blur: 12px;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
    --bgx: 0px;
    --bgy: 0px;
}

body {
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5));
    background-size: cover;
    background-position: calc(50% + var(--bgx)) calc(50% + var(--bgy));
    background-attachment: fixed;
    min-height: 100vh;
    display: block;
    color: white;
    position: relative;
    transition: background-image 0.8s ease-in-out;
}

/* Progressive image loading placeholder */
.img-placeholder {
    background: linear-gradient(45deg, rgba(255,255,255,0.05), rgba(255,255,255,0.15), rgba(255,255,255,0.05));
    background-size: 300% 300%;
    animation: shimmer 2s ease-in-out infinite;
    filter: blur(2px);
    transition: opacity 0.4s ease, filter 0.4s ease;
}

.img-loading {
    opacity: 0.7;
    filter: blur(4px);
    transition: opacity 0.6s ease, filter 0.6s ease;
}

.img-loaded {
    opacity: 1;
    filter: blur(0);
}

.container {
    max-width: 960px;
    width: 100%;
    padding: 2rem;
    position: relative;
    z-index: 2;
    margin: 6vh auto 10vh;
    display: grid;
    row-gap: 3rem;
}

.profile {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 1.5rem;
    align-items: center;
    justify-items: start;
    text-align: left;
    margin-bottom: 3rem;
    background: transparent;
    border: none;
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
    backdrop-filter: none;
    box-shadow: none;
    animation: fadeInUp 0.6s ease both;
}

.avatar-wrap {
    position: relative;
    width: 132px;
    height: 132px;
    display: grid;
    place-items: center;
    will-change: transform;
    transition: transform 0.15s ease;
    transform-style: preserve-3d;
    overflow: hidden;
    border-radius: 50%;
}

.avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: none;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
    display: block;
    object-fit: cover;
    margin: 0;
    animation: floatY 6s ease-in-out infinite;
    transition: filter 0.16s ease, opacity 0.3s ease;
    opacity: 0;
}

.avatar.loaded {
    opacity: 1;
}

.avatar-placeholder {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: linear-gradient(45deg, rgba(255,255,255,0.1), rgba(255,255,255,0.3), rgba(255,255,255,0.1));
    background-size: 300% 300%;
    animation: shimmer 1.5s ease-in-out infinite, floatY 6s ease-in-out infinite;
    position: absolute;
    top: 0;
    left: 0;
}

@keyframes shimmer {
    0% { background-position: -300% 0; }
    100% { background-position: 300% 0; }
}

.avatar.avatar-press { filter: brightness(1.18) saturate(1.06); }

.avatar.avatar-pop {
    animation: floatY 6s ease-in-out infinite, avatarPop 220ms cubic-bezier(0.2, 0.8, 0.2, 1) both;
    box-shadow: 0 10px 26px rgba(0, 0, 0, 0.45);
}

.avatar-wrap:hover { transform: translateY(-2px) scale(1.02); }

.avatar-wrap::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background: radial-gradient(circle 60px at var(--ax, 50%) var(--ay, 50%), rgba(255,255,255,0.08), transparent 60%);
    opacity: 0;
    transition: opacity 0.25s ease;
    pointer-events: none;
    filter: blur(6px);
}
.avatar-wrap:hover::after { opacity: 1; }

.intro {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 0.25rem;
}

.section-title {
    font-family: 'Space Grotesk', 'Inter', system-ui, -apple-system, sans-serif;
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    letter-spacing: 0.2px;
}

.about-text {
    opacity: 0.9;
    line-height: 1.8;
    margin-bottom: 1rem;
}
.about-text .line { margin: 0 0 0.6rem; }

.lang-toggle {
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 6;
    padding: 6px 12px;
    border-radius: 9999px;
    border: 1px solid var(--border);
    background: rgba(0, 0, 0, 0.4);
    color: var(--text);
    font-size: 0.85rem;
    cursor: pointer;
    backdrop-filter: blur(6px);
    transition: transform 0.15s ease, border-color 0.2s ease;
}
.lang-toggle:hover { transform: translateY(-1px); border-color: var(--border-hover); }

.timeline {
    position: relative;
    margin-top: 0.75rem;
}
.timeline::before {
    content: '';
    position: absolute;
    left: 120px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: rgba(255,255,255,0.18);
}
.tl-item {
    position: relative;
    padding-left: 160px;
    margin: 0 0 16px;
}
.tl-dot {
    position: absolute;
    left: 114px;
    top: 0.6rem;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255,255,255,0.9);
    box-shadow: 0 0 0 3px rgba(255,255,255,0.14);
}
.tl-content { padding-bottom: 0.4rem; }
.tl-time {
    position: absolute;
    left: 0;
    top: 0.2rem;
    width: 100px;
    text-align: right;
    font-weight: 700;
    opacity: 0.95;
}
.tl-desc { opacity: 0.88; }

.title {
    font-family: 'Space Grotesk', 'Inter', system-ui, -apple-system, sans-serif;
    font-size: 2.4rem;
    font-weight: 600;
    margin: 0;
    letter-spacing: 0.3px;
    color: #e6eefb;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.35);
    position: relative;
    display: inline-block;
}

.nav-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.nav-link {
    background: transparent;
    backdrop-filter: none;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    min-height: 140px;
    text-decoration: none;
    color: var(--text);
    transition: transform 0.12s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    position: relative;
    overflow: hidden;
    display: block;
    animation: fadeInUp 0.6s ease both;
    transform-style: preserve-3d;
    will-change: transform;
}

.nav-link::after {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: radial-gradient(400px circle at var(--x, 50%) var(--y, 50%), rgba(255,255,255,0.06), transparent 35%);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 0;
}

.nav-link:hover {
    transform: translateY(-6px) scale(1.01);
    background: transparent;
    box-shadow: var(--shadow);
    border-color: var(--border-hover);
}

.nav-link:hover::after { opacity: 1; }

.nav-link h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    font-family: 'Space Grotesk', 'Inter', system-ui, -apple-system, sans-serif;
    font-weight: 600;
    letter-spacing: 0.2px;
}

.nav-links:hover .nav-link { opacity: 0.9; }
.nav-links .nav-link:hover { opacity: 1; }

.nav-link p {
    opacity: 0.8;
    font-size: 0.9rem;
    line-height: 1.6;
}

.nav-link h3::after {
    content: '';
    display: block;
    width: 36px;
    height: 2px;
    background: var(--border);
    margin-top: 0.6rem;
    border-radius: 1px;
}

.nav-link:hover h3::after {
    background: var(--border-hover);
}

.nav-link:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.25), var(--shadow);
    border-color: rgba(255, 255, 255, 0.45);
}

.nav-links > .nav-link:nth-child(1) { animation-delay: 0.05s; }
.nav-links > .nav-link:nth-child(2) { animation-delay: 0.12s; }
.nav-links > .nav-link:nth-child(3) { animation-delay: 0.2s; }
.nav-links > .nav-link:nth-child(4) { animation-delay: 0.28s; }

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes floatY {
    0% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
    100% { transform: translateY(0); }
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes spin {
    to { --deg: 360deg; }
}

@keyframes grain {
    0% { transform: translate(0, 0); }
    10% { transform: translate(-1%, -1%); }
    20% { transform: translate(-2%, 0); }
    30% { transform: translate(1%, 2%); }
    40% { transform: translate(0, -1%); }
    50% { transform: translate(1%, 1%); }
    60% { transform: translate(-1%, 0); }
    70% { transform: translate(0, 1%); }
    80% { transform: translate(2%, 0); }
    90% { transform: translate(0, -2%); }
    100% { transform: translate(0, 0); }
}

.cursor-ring {
    position: fixed;
    width: 30px;
    height: 30px;
    border: 2px solid rgba(255,255,255,0.35);
    border-radius: 50%;
    pointer-events: none;
    mix-blend-mode: difference;
    transform: translate(-50%, -50%);
    transition: transform 0.12s ease, opacity 0.3s ease, border-color 0.3s ease;
    z-index: 50;
    opacity: 0.85;
}
.cursor-ring.active {
    transform: translate(-50%, -50%) scale(1.25);
    border-color: rgba(255,255,255,0.6);
}
.cursor-ring.press {
    transform: translate(-50%, -50%) scale(0.9);
}

#bg-particles {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
}

.ripple {
    position: absolute;
    width: 12px;
    height: 12px;
    margin-left: -6px;
    margin-top: -6px;
    border-radius: 50%;
    background: rgba(255,255,255,0.4);
    filter: blur(1px);
    animation: ripple 0.6s ease-out;
    pointer-events: none;
    z-index: 2;
}
.ripple-avatar {
    background: rgba(255,255,255,0.55);
    filter: blur(0.5px);
    animation: rippleAvatar 0.7s ease-out;
}
.ripple-ring {
    position: absolute;
    width: 16px;
    height: 16px;
    margin-left: -8px;
    margin-top: -8px;
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,0.85);
    animation: rippleRing 0.8s ease-out;
    pointer-events: none;
    z-index: 2;
}

@keyframes ripple {
    from { transform: scale(0); opacity: 0.7; }
    to { transform: scale(12); opacity: 0; }
}
@keyframes rippleAvatar {
    from { transform: scale(0); opacity: 0.85; }
    to { transform: scale(18); opacity: 0; }
}
@keyframes rippleRing {
    from { transform: scale(0.5); opacity: 0.9; }
    to { transform: scale(12); opacity: 0; }
}
@keyframes avatarPop {
    0% { transform: scale(1); }
    45% { transform: scale(0.94); }
    100% { transform: scale(1); }
}

@media (prefers-reduced-motion: reduce) {
    .profile, .nav-link, .avatar, .avatar-wrap { animation: none !important; }
    .nav-link, .nav-link:hover { transform: none; }
}

/* Background system enhancements */
body {
    transition: background-image 0.8s ease-in-out;
}

/* Avatar loading states */
.avatar-loader {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 24px;
    height: 24px;
    color: rgba(255, 255, 255, 0.9);
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 50%;
    backdrop-filter: blur(4px);
    animation: spin 1s linear infinite;
    z-index: 3;
    pointer-events: none;
}

@keyframes spin {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Enhanced avatar interactions */
.avatar {
    transition: transform 0.2s ease, filter 0.3s ease, opacity 0.3s ease;
    cursor: pointer;
}

.avatar:hover {
    transform: scale(1.05);
    filter: brightness(1.1);
}

.avatar:active {
    transform: scale(0.95);
}

/* Background loading states */
.bg-loading {
    position: relative;
}

.bg-loading::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.6), transparent);
    animation: loading-bar 2s ease-in-out infinite;
    z-index: 100;
}

@keyframes loading-bar {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100vw); }
}

/* Success feedback */
.bg-success .avatar {
    animation: success-pulse 0.3s ease;
}

@keyframes success-pulse {
    0% { transform: scale(1); filter: brightness(1); }
    50% { transform: scale(1.08); filter: brightness(1.2) saturate(1.2); }
    100% { transform: scale(1); filter: brightness(1); }
}

/* Error feedback */
.bg-error .avatar {
    animation: error-shake 0.5s ease;
}

@keyframes error-shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-3px); }
    75% { transform: translateX(3px); }
}

/* Performance optimizations */
.avatar-wrap {
    will-change: transform;
    contain: layout style paint;
}

.nav-link {
    will-change: transform;
    contain: layout style paint;
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .avatar-loader {
        animation: none;
    }
    
    body {
        transition: none;
    }
    
    .avatar {
        transition: opacity 0.3s ease;
    }
    
    .bg-loading::before {
        display: none;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .profile {
        grid-template-columns: 1fr;
        justify-items: center;
        text-align: center;
    }
    
    .avatar {
        margin-bottom: 0.75rem;
    }
    
    .nav-links {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .nav-link {
        padding: 1.5rem;
        min-height: 0;
    }
}