:root {
    --ease-smooth: cubic-bezier(0.22, 1, 0.36, 1);
    --ease-butter: cubic-bezier(0.2, 0.8, 0.2, 1);
    --dur-fast: 180ms;
    --dur-medium: 320ms;
    --dur-slow: 520ms;
    --shadow-soft: 0 8px 20px rgba(17, 24, 39, 0.08);
    --focus-ring: 0 0 0 3px rgba(31, 41, 55, 0.18);
    --lift-sm: translateY(-2px);
    --lift-md: translateY(-4px);
}

html {
    height: 100%;
    scroll-behavior: smooth;
    scroll-padding-top: 1rem;
}

body {
    background-color: #f7f8fa;
    background-image: none;
    font-family: "DM Sans", sans-serif;
    font-size: clamp(16px, 1.05vw, 18px);
    font-weight: 400;
    margin: 0;
    padding: clamp(1rem, 3vw, 2rem) clamp(2.75rem, 16vw, 22rem) 1.6rem;
    min-height: 100dvh;
    height: auto;
    overflow-x: hidden;
    overflow-y: auto;
    line-height: 1.62;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body::before {
    content: "";
    position: fixed;
    left: 0;
    top: 0;
    z-index: 30;
    width: calc(var(--scroll-progress, 0) * 100%);
    height: 2px;
    background: #111111;
    opacity: 0.35;
    pointer-events: none;
    transition: width 120ms linear;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

img {
    display: block;
    max-width: 100%;
}

:focus-visible {
    outline: 2px solid #111111;
    outline-offset: 2px;
}

.global-css {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 clamp(1.25rem, 4vw, 4.5rem);
    min-height: 100%;
    height: auto;
    display: grid;
    grid-template-rows: auto 1fr auto;
}

.global-css > header,
.page-content > p,
.page-content > .project-grid,
.page-content > .experience-section,
.page-content > .about-me-section {
    animation: fade-up 560ms var(--ease-butter) both;
}

.page-content > p:nth-of-type(1) {
    animation-delay: 80ms;
}

.page-content > p:nth-of-type(2) {
    animation-delay: 140ms;
}

.page-content > .project-grid {
    animation-delay: 180ms;
}

.page-content > .experience-section {
    animation-delay: 220ms;
}

.page-content > .about-me-section {
    animation-delay: 260ms;
}

.global-css header {
    margin-bottom: 0;
}

.page-content {
    min-height: auto;
    overflow: visible;
    padding: 3rem 0 0.5rem;
}

.top-bar {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    min-height: 96px;
    border-bottom-left-radius: 16px;
    border-bottom-right-radius: 16px;
    overflow: hidden;
}

.top-bar::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 6px;
    border-bottom: 1px solid #d6d1ca;
}

.brand-name {
    color: #161616;
    text-decoration: none;
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    line-height: 1.1;
    transition: transform var(--dur-fast) var(--ease-smooth), opacity var(--dur-fast) var(--ease-smooth);
}

.brand-name:hover,
.brand-name:focus-visible {
    transform: translate3d(0, -2px, 0);
    opacity: 0.9;
}

.top-nav {
    display: flex;
    align-items: center;
    gap: 0.65rem;
}

.top-link {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 54px;
    padding: 0.75rem 1.35rem;
    border: 1px solid #d7d3cd;
    border-radius: 999px;
    color: #515151;
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    line-height: 1;
    box-shadow: 0 0 0 rgba(22, 22, 22, 0);
    transition: transform var(--dur-fast) var(--ease-butter), background-color var(--dur-fast) var(--ease-butter), color var(--dur-fast) var(--ease-butter), border-color var(--dur-fast) var(--ease-butter), box-shadow var(--dur-fast) var(--ease-butter);
    will-change: transform;
    touch-action: manipulation;
}

.top-link:hover {
    background-color: #e2ddd6;
    color: #2f2f2f;
    transform: translate3d(0, -2px, 0);
    box-shadow: var(--shadow-soft);
}

.top-link:active {
    transform: translate3d(0, 0, 0);
}

.top-link-resume {
    background-color: #141414;
    border-color: #141414;
    color: #f4f4f4;
    min-height: 44px;
    padding-top: 0.6rem;
    padding-bottom: 0.6rem;
}

.top-nav .top-link:not(.top-link-mail) {
    min-height: 44px;
    padding-top: 0.6rem;
    padding-bottom: 0.6rem;
}

.top-link-resume:hover {
    background-color: #2a2a2a;
    border-color: #2a2a2a;
    color: #ffffff;
}

.top-link-mail {
    --mail-collapsed-width: 8.5rem;
    --mail-expanded-width: 23rem;
    max-width: var(--mail-collapsed-width);
    overflow: hidden;
    gap: 0.45rem;
    white-space: nowrap;
    transition: max-width 680ms cubic-bezier(0.2, 0.9, 0.28, 1), background-color 300ms var(--ease-smooth), color 300ms var(--ease-smooth), border-color 300ms var(--ease-smooth);
}

.mail-label {
    max-width: 6rem;
    overflow: hidden;
    transition: transform 460ms cubic-bezier(0.2, 0.9, 0.28, 1), opacity 380ms var(--ease-smooth), max-width 420ms cubic-bezier(0.2, 0.9, 0.28, 1);
}

.mail-address {
    max-width: 0;
    opacity: 0;
    transform: translateX(-0.3rem);
    overflow: hidden;
    transition: max-width 680ms cubic-bezier(0.2, 0.9, 0.28, 1), opacity 420ms var(--ease-smooth) 100ms, transform 500ms cubic-bezier(0.2, 0.9, 0.28, 1) 100ms;
}

.mail-copy {
    max-width: 0;
    opacity: 0;
    transform: translateX(-0.3rem);
    overflow: hidden;
    color: #d9d9da;
    font-size: 1.02rem;
    line-height: 1;
    transition: max-width 680ms cubic-bezier(0.2, 0.9, 0.28, 1), opacity 420ms var(--ease-smooth) 120ms, transform 500ms cubic-bezier(0.2, 0.9, 0.28, 1) 120ms, color var(--dur-fast) var(--ease-smooth);
    cursor: pointer;
    touch-action: manipulation;
}

.mail-copy:hover,
.mail-copy:focus-visible {
    color: #ffffff;
}

.mail-copy.is-copied {
    font-size: 0.72rem;
    letter-spacing: 0.02em;
    color: #ffffff;
}

.top-link-mail:hover,
.top-link-mail:focus-visible,
.top-link-mail.is-expanded {
    max-width: var(--mail-expanded-width);
}

.top-link-mail:hover .mail-label,
.top-link-mail:focus-visible .mail-label,
.top-link-mail.is-expanded .mail-label {
    max-width: 0;
    opacity: 0;
    transform: translateX(-0.12rem);
}

.top-link-mail:hover .mail-address,
.top-link-mail:focus-visible .mail-address,
.top-link-mail.is-expanded .mail-address {
    max-width: 18rem;
    opacity: 1;
    transform: translateX(0);
}

.top-link-mail:hover .mail-copy,
.top-link-mail:focus-visible .mail-copy,
.top-link-mail.is-expanded .mail-copy {
    max-width: 1.2rem;
    opacity: 1;
    transform: translateX(0);
}

.top-link-mail:hover .mail-copy.is-copied,
.top-link-mail:focus-visible .mail-copy.is-copied,
.top-link-mail.is-expanded .mail-copy.is-copied {
    max-width: 3.2rem;
}

.global-css p {
    margin: 0;
    max-width: 70ch;
    line-height: 1.68;
    text-align: justify;
}

.global-css p + p {
    margin-top: 1.05rem;
}

.profile-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.3rem;
}

.profile-tag {
    display: inline-flex;
    align-items: center;
    min-height: 2.6rem;
    padding: 0.45rem 0.85rem;
    border: 1px solid #d6d6da;
    border-radius: 14px;
    font-family: "Google Sans Code", monospace;
    font-size: clamp(0.9rem, 1.45vw, 1.35rem);
    letter-spacing: 0.03em;
    color: #3a4fff;
    background: rgba(255, 255, 255, 0.45);
}

h3 {
    margin: 0 0 0.75rem;
    font-size: clamp(1.35rem, 2.4vw, 1.8rem);
    letter-spacing: -0.02em;
    line-height: 1.2;
}

h4 {
    margin: 2rem 0 0.9rem;
    font-size: clamp(1rem, 1.35vw, 1.1rem);
    letter-spacing: 0.03em;
    color: #555555;
}

.section-title {
    margin: 2rem 0 0.2rem;
    font-size: clamp(1.6rem, 4vw, 2.7rem);
    line-height: 1.08;
    letter-spacing: -0.03em;
    color: #101010;
}

.section-subtitle {
    margin: 0;
    font-size: clamp(0.95rem, 1.55vw, 1.35rem);
    line-height: 1.34;
    letter-spacing: -0.015em;
    color: #7f7f83;
}

.experience-section,
.about-me-section {
    margin-top: clamp(2.25rem, 6vw, 3rem);
}

.site-footer {
    margin-top: 0;
    margin-bottom:0;
    padding-top: 0.4rem;
    border-top: 1px solid #d6d1ca;
    color: #666666;
    font-size: 0.95rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.footer-copy {
    margin: 0;
}

.footer-socials {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
}

.footer-socials a {
    display: inline-flex;
    align-items: center;
    touch-action: manipulation;
}

.footer-social-icon {
    width: 2rem;
    height:2rem;
    object-fit: contain;
    opacity: 0.9;
    transition: opacity var(--dur-fast) var(--ease-smooth), transform var(--dur-fast) var(--ease-smooth);
}

.footer-socials a:hover .footer-social-icon,
.footer-socials a:focus-visible .footer-social-icon {
    opacity: 1;
    transform: translate3d(0, -1px, 0);
}

.reveal-on-scroll {
    opacity: 0;
    transform: translate3d(0, 16px, 0) scale(0.992);
    transition: transform 700ms var(--ease-butter), opacity 520ms ease-out;
    will-change: opacity, transform;
}

.reveal-on-scroll.is-visible,
.is-visible {
    opacity: 1;
    transform: translate3d(0, 0, 0) scale(1);
}

@keyframes fade-up {
    from {
        opacity: 0;
        transform: translate3d(0, 8px, 0);
    }

    to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
    }
}

@media (max-width: 900px) {
    .global-css {
        padding: 0 1.25rem;
    }

    .page-content {
        padding-top: 0.7rem;
    }

    .top-bar {
        min-height: 84px;
        flex-wrap: wrap;
        align-items: flex-start;
        padding-bottom: 0.75rem;
    }

    .brand-name {
        font-size: 1rem;
    }

    .top-nav {
        gap: 0.5rem;
        width: 100%;
    }

    .top-link {
        flex: 1;
        min-height: 44px;
        padding: 0.55rem 0.95rem;
        font-size: 1rem;
    }

    .top-link-mail {
        --mail-collapsed-width: 7.5rem;
        --mail-expanded-width: 17.5rem;
    }

    .top-link-mail:hover,
    .top-link-mail:focus-visible,
    .top-link-mail.is-expanded {
        max-width: var(--mail-expanded-width);
    }

    .top-link-mail:hover .mail-address,
    .top-link-mail:focus-visible .mail-address,
    .top-link-mail.is-expanded .mail-address {
        max-width: 12rem;
    }

    .profile-tags {
        margin-top: 1.1rem;
        gap: 0.6rem;
    }
}

@media (max-width: 600px) {
    body {
        padding: 0.75rem 0.75rem 1.3rem;
    }

    .top-bar {
        gap: 0.7rem;
    }

    .page-content {
        padding-top: 0.6rem;
    }

    .top-nav {
        flex-direction: column;
    }

    .top-link {
        width: 100%;
    }

    .top-link-mail {
        max-width: none;
        width: 100%;
        justify-content: center;
    }

    .top-link-mail .mail-label {
        max-width: none;
        opacity: 1;
        transform: none;
    }

    .top-link-mail .mail-address {
        display: none;
    }

    .top-link-mail .mail-copy {
        display: none;
    }

    .site-footer {
        flex-wrap: wrap;
        justify-content: center;
        text-align: center;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .reveal-on-scroll {
        opacity: 1;
        transform: none;
    }
}