/* TOKENS -------------------------------------------*/
:root {
    --bg: hsl(228, 28%, 7%);
    --surface: hsl(228, 22%, 14%);
    --surface-2: hsl(228, 20%, 18%);
    --border: hsl(228, 16%, 26%);
    --border-strong: hsl(228, 16%, 38%);
    --text: hsl(160, 12%, 96%);
    --text-dim: hsl(228, 12%, 72%);
    --accent: #00e0a8;

    --glass-bg: hsla(228, 26%, 17%, 0.5);
    --glass-bg-strong: hsla(228, 28%, 12%, 0.66);
    --glass-border: hsla(0, 0%, 100%, 0.12);
    --glass-blur: blur(16px) saturate(1.4);
    --glass-highlight: inset 0 1px 0 hsla(0, 0%, 100%, 0.08);
    --glass-shadow: 0 24px 70px -16px hsla(228, 55%, 2%, 0.5);

    --f-display: 'Space Grotesk', system-ui, sans-serif;
    --f-body: 'Hanken Grotesk', system-ui, sans-serif;
    --f-mono: 'JetBrains Mono', ui-monospace, monospace;

    --radius: 12px;
    --radius-lg: 18px;
    --max-width: 1180px;
    --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* RESET --------------------------------------------*/
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html {
    scroll-behavior: smooth;
    font-size: 18px;
    overflow-x: hidden;
}
body {
    background-color: var(--bg);
    color: var(--text);
    font-family: var(--f-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}
body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background-image:
        radial-gradient(50% 45% at 12% 8%, hsla(162, 90%, 48%, 0.20), transparent 60%),
        radial-gradient(45% 45% at 92% 12%, hsla(188, 90%, 52%, 0.16), transparent 60%),
        radial-gradient(55% 55% at 80% 92%, hsla(216, 90%, 55%, 0.18), transparent 62%),
        radial-gradient(50% 50% at 16% 90%, hsla(265, 70%, 60%, 0.12), transparent 62%);
}
img {
    display: block;
    max-width: 100%;
}
a {
    color: inherit;
    text-decoration: none;
}
::selection {
    background: var(--accent);
    color: var(--bg);
}

/* BASE TYPOGRAPHY ----------------------------------*/
h1, h2, h3 {
    font-family: var(--f-display);
    font-weight: 700;
    line-height: 1.08;
    letter-spacing: normal;
}
.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--f-mono);
    font-size: 0.78rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-dim);
}
.eyebrow::before {
    content: "";
    width: 9px;
    height: 9px;
    background: var(--accent);
}
.section_index {
    display: inline-block;
    font-family: var(--f-mono);
    font-size: 0.78rem;
    letter-spacing: 0.14em;
    color: var(--accent);
    margin-bottom: 0.5rem;
}
.noscript_note {
    color: var(--text-dim);
}

/* LAYOUT -------------------------------------------*/
.wrap {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 6%;
}
section {
    scroll-margin-top: 86px;
}

/* FOCUS + SKIP LINK --------------------------------*/
:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 4px;
}
.skip_link {
    position: absolute;
    left: 1rem;
    top: -100px;
    z-index: 1100;
    padding: 0.6rem 1rem;
    background: var(--accent);
    color: var(--bg);
    font-weight: 600;
    border-radius: var(--radius);
    transition: top 0.2s var(--ease);
}
.skip_link:focus {
    top: 1rem;
}

/* NAVIGATION BAR (glass) ---------------------------*/
.navbar_section {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--glass-bg-strong);
    -webkit-backdrop-filter: var(--glass-blur);
    backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
}
.navbar_inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}
.navbar_title {
    font-family: var(--f-display);
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    transition: color 0.25s var(--ease);
}
.navbar_title span {
    color: var(--accent);
}
.navbar_title:hover {
    color: var(--accent);
}
.navbar_links {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    list-style: none;
}
.navbar_link {
    position: relative;
    padding: 0.45rem 0.95rem;
    font-size: 0.98rem;
    color: var(--text-dim);
    transition: color 0.25s var(--ease);
}
.navbar_link:hover {
    color: var(--text);
}
.navbar_link::after {
    content: "";
    position: absolute;
    left: 0.95rem;
    right: 0.95rem;
    bottom: 0.15rem;
    height: 2px;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.25s var(--ease);
}
.navbar_link:hover::after {
    transform: scaleX(1);
}
.navbar_hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    background: none;
    border: 0;
    cursor: pointer;
}
.navbar_hamburger .bar {
    display: block;
    width: 24px;
    height: 2px;
    margin: 0 auto;
    background: var(--text);
    transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}
.navbar_hamburger.is-active .bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.navbar_hamburger.is-active .bar:nth-child(2) {
    opacity: 0;
}
.navbar_hamburger.is-active .bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* HERO (glass panel) -------------------------------*/
.about_section {
    position: relative;
    overflow: hidden;
    padding: 64px 0 72px;
}
.about_inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 6%;
}
.about_panel {
    display: flex;
    align-items: center;
    gap: 6%;
    padding: 52px 48px;
    background: var(--glass-bg-strong);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-highlight), var(--glass-shadow);
    -webkit-backdrop-filter: var(--glass-blur);
    backdrop-filter: var(--glass-blur);
    animation: rise 0.7s var(--ease) backwards;
}
.about_div_1 {
    flex: 2;
}
.about_div_2 {
    flex: 1;
    display: flex;
    justify-content: center;
}
.about_section h1 {
    font-size: clamp(2.6rem, 6.5vw, 4rem);
    margin: 0.9rem 0 0.4rem;
}
.about_section h1 .surname {
    color: transparent;
    -webkit-text-stroke: 1.5px var(--accent);
}
@supports not ((-webkit-text-stroke: 1px #000)) {
    .about_section h1 .surname {
        color: var(--accent);
    }
}
.about_lead {
    font-size: clamp(1.2rem, 2.6vw, 1.5rem);
    color: var(--text);
    margin: 0.3rem 0 1.2rem;
    max-width: 42ch;
}
.about_bio {
    font-size: 1.05rem;
    color: var(--text-dim);
    max-width: 56ch;
}
.about_bio strong {
    color: var(--text);
    font-weight: 600;
}
.about_photo {
    position: relative;
    width: 100%;
    max-width: 250px;
}
.about_photo::before {
    content: "";
    position: absolute;
    inset: 0;
    transform: translate(14px, 14px);
    background: var(--accent);
    border-radius: var(--radius-lg);
    transition: transform 0.3s var(--ease);
}
.about_photo img {
    position: relative;
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: var(--radius-lg);
}
.about_photo:hover::before {
    transform: translate(7px, 7px);
}

/* SECTION HEAD -------------------------------------*/
.section_head {
    margin-bottom: 2rem;
}
.section_head h2 {
    font-size: clamp(2rem, 4.5vw, 2.7rem);
    margin-bottom: 0.4rem;
}
.section_head p {
    color: var(--text-dim);
    max-width: 60ch;
}

/* FILTER BAR ---------------------------------------*/
.filter_bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-bottom: 1.5rem;
}
.filter_btn {
    padding: 0.45rem 1.1rem;
    font-family: var(--f-mono);
    font-size: 0.82rem;
    letter-spacing: 0.04em;
    color: var(--text-dim);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 999px;
    cursor: pointer;
    transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.filter_btn:hover {
    color: var(--text);
    border-color: var(--border-strong);
}
.filter_btn[aria-pressed="true"] {
    color: var(--bg);
    background: var(--accent);
    border-color: var(--accent);
    font-weight: 600;
}
.filter_count {
    font-family: var(--f-mono);
    font-size: 0.82rem;
    color: var(--text-dim);
    margin-bottom: 1.5rem;
}

/* PROJECT GRID + CARD (glass) ----------------------*/
.projects_grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.4rem;
}
.project_card {
    display: flex;
    flex-direction: column;
    text-align: left;
    background: hsla(228, 26%, 17%, 0.72);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-highlight);
    overflow: hidden;
    cursor: pointer;
    color: inherit;
    font: inherit;
    transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
    animation: rise 0.55s var(--ease) backwards;
}
.project_card:hover {
    transform: translateY(-6px);
    border-color: var(--accent);
    box-shadow: var(--glass-highlight), 0 22px 60px -18px hsla(228, 55%, 2%, 0.5);
}
.card_cover_wrap {
    position: relative;
}
.card_cover {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
    background: var(--surface-2);
}
.card_index {
    position: absolute;
    top: 0.7rem;
    right: 0.7rem;
    font-family: var(--f-mono);
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    color: var(--accent);
    background: hsla(228, 28%, 7%, 0.7);
    padding: 0.2rem 0.5rem;
    border-radius: 6px;
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
}
.card_body {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 1.05rem 1.15rem 1.25rem;
}
.card_cat {
    font-family: var(--f-mono);
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent);
}
.card_title {
    font-size: 1.2rem;
    color: var(--text);
}
.tag_row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.2rem;
    list-style: none;
}
.tag {
    font-family: var(--f-mono);
    font-size: 0.7rem;
    letter-spacing: 0.02em;
    padding: 0.22rem 0.55rem;
    border-radius: 999px;
    color: hsl(228, 14%, 82%);
    background: hsla(228, 18%, 26%, 0.85);
    border: 1px solid var(--border-strong);
}

/* PUBLICATIONS (glass) -----------------------------*/
.publications_section {
    padding: 90px 0;
}
.pub_list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    list-style: none;
}
.pub_item {
    background: var(--glass-bg-strong);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-highlight);
    -webkit-backdrop-filter: var(--glass-blur);
    backdrop-filter: var(--glass-blur);
    padding: 1.2rem 1.4rem;
}
.pub_title {
    font-family: var(--f-display);
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--text);
    margin-bottom: 0.4rem;
}
.pub_authors {
    color: var(--text-dim);
    font-size: 0.95rem;
}
.pub_authors strong {
    color: var(--text);
    font-weight: 600;
}
.pub_meta {
    font-family: var(--f-mono);
    font-size: 0.8rem;
    color: var(--accent);
    margin-top: 0.5rem;
}
.pub_link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    margin-top: 0.7rem;
    font-family: var(--f-mono);
    font-size: 0.82rem;
    color: var(--text);
    border-bottom: 1px solid var(--border-strong);
    transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.pub_link::after {
    content: "\2197";
}
.pub_link:hover {
    color: var(--accent);
    border-color: var(--accent);
}

/* MODAL (glass) ------------------------------------*/
.modal {
    width: min(760px, 92vw);
    max-height: 90vh;
    margin: auto;
    padding: 0;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    background: var(--glass-bg-strong);
    -webkit-backdrop-filter: blur(28px) saturate(1.4);
    backdrop-filter: blur(28px) saturate(1.4);
    color: var(--text);
    overflow: hidden;
    box-shadow: var(--glass-highlight), 0 30px 90px -20px hsla(228, 55%, 2%, 0.6);
}
.modal::backdrop {
    background: hsla(228, 45%, 3%, 0.5);
    -webkit-backdrop-filter: blur(3px);
    backdrop-filter: blur(3px);
}
.modal_inner {
    max-height: 90vh;
    overflow-y: auto;
    padding: 1.5rem;
}
.modal_head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
}
.modal_head h2 {
    font-size: clamp(1.4rem, 4vw, 1.9rem);
    color: var(--text);
}
.modal_close {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: grid;
    place-items: center;
    font-size: 1.8rem;
    line-height: 1;
    color: var(--text-dim);
    background: transparent;
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    cursor: pointer;
    transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.modal_close:hover {
    color: var(--accent);
    border-color: var(--accent);
}
.modal_media {
    display: flex;
    align-items: center;
    justify-content: center;
    background: hsla(228, 45%, 3%, 0.45);
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 1rem;
}
.modal_media img {
    width: 100%;
    height: auto;
    max-height: 64vh;
    object-fit: contain;
}
.modal_body {
    color: var(--text-dim);
    font-size: 1rem;
    margin-top: 1rem;
}
.modal_links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
    margin-top: 1.3rem;
}

/* BUTTONS ------------------------------------------*/
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.7rem 1.3rem;
    font-family: var(--f-body);
    font-size: 1rem;
    font-weight: 600;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    cursor: pointer;
    transition: transform 0.2s var(--ease), background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.btn_primary {
    background: var(--accent);
    color: var(--bg);
    border-color: var(--accent);
}
.btn_ghost {
    background: var(--glass-bg);
    color: var(--text);
}
.btn:hover {
    transform: translateY(-3px);
}
.btn_ghost:hover {
    color: var(--accent);
    border-color: var(--accent);
}

/* CONTACT (glass panel) ----------------------------*/
.contact_section {
    padding: 90px 0 100px;
}
.contact_panel {
    background: var(--glass-bg-strong);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-highlight), var(--glass-shadow);
    -webkit-backdrop-filter: var(--glass-blur);
    backdrop-filter: var(--glass-blur);
    padding: 52px 48px;
    text-align: center;
}
.contact_panel h2 {
    font-size: clamp(2rem, 4.5vw, 2.7rem);
    margin-bottom: 1.2rem;
}
.contact_buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    justify-content: center;
}
.contact_meta {
    font-family: var(--f-mono);
    font-size: 0.92rem;
    color: var(--text-dim);
    margin-top: 1.6rem;
    line-height: 1.9;
}
.contact_meta a:hover {
    color: var(--accent);
}

/* FOOTER -------------------------------------------*/
.site_footer {
    padding: 1.6rem 6%;
    text-align: center;
    font-family: var(--f-mono);
    font-size: 0.8rem;
    color: var(--text-dim);
    border-top: 1px solid var(--glass-border);
}

/* MOTION -------------------------------------------*/
@keyframes rise {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
        scroll-behavior: auto !important;
    }
    .about_photo::before {
        transform: translate(9px, 9px);
    }
}

/* RESPONSIVE: TABLET -------------------------------*/
@media (max-width: 900px) {
    html {
        font-size: 17px;
    }
    .navbar_hamburger {
        display: flex;
    }
    .navbar_links {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 0.5rem 6% 1rem;
        background: var(--glass-bg-strong);
        -webkit-backdrop-filter: var(--glass-blur);
        backdrop-filter: var(--glass-blur);
        border-bottom: 1px solid var(--glass-border);
        transform: translateY(-130%);
        opacity: 0;
        pointer-events: none;
        transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
    }
    .navbar_links.is-open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }
    .navbar_link {
        padding: 0.8rem 0;
        font-size: 1.05rem;
    }
    .navbar_link::after {
        display: none;
    }
    .about_panel {
        flex-direction: column;
        text-align: center;
        gap: 2.2rem;
        padding: 40px 28px;
    }
    .about_lead,
    .about_bio {
        margin-left: auto;
        margin-right: auto;
    }
    .about_photo {
        max-width: 200px;
    }
    .contact_panel {
        padding: 40px 28px;
    }
}

/* RESPONSIVE: PHONE --------------------------------*/
@media (max-width: 560px) {
    html {
        font-size: 16px;
    }
    .projects_grid {
        grid-template-columns: 1fr;
    }
    .projects_section,
    .publications_section {
        padding: 60px 0;
    }
    .modal_inner {
        padding: 1.1rem;
    }
    .btn {
        flex: 1 1 auto;
        justify-content: center;
    }
}