@font-face {
    font-family: "Doran";
    src: url("../fonts/Doran-Regular.woff2") format("woff2");
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

:root {
    color-scheme: dark;
    --bg: #05070d;
    --bg-soft: #11111a;
    --surface: rgba(12, 18, 29, 0.72);
    --surface-strong: rgba(18, 25, 38, 0.88);
    --line: rgba(255, 255, 255, 0.14);
    --line-strong: rgba(255, 255, 255, 0.24);
    --text: #f7fbff;
    --muted: #b6c2d3;
    --aqua: #4df4dc;
    --cyan: #41c7ff;
    --coral: #ff6f75;
    --gold: #ffd166;
    --green: #7de38d;
    --violet: #b49aff;
    --shadow: rgba(0, 0, 0, 0.45);
    --max: 1180px;
    --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    background: var(--bg);
}

body {
    min-height: 100vh;
    margin: 0;
    font-family: "Doran", Tahoma, Arial, sans-serif;
    color: var(--text);
    background:
        linear-gradient(135deg, rgba(5, 7, 13, 0.94), rgba(19, 10, 25, 0.88) 44%, rgba(8, 22, 20, 0.9)),
        var(--bg);
    overflow-x: hidden;
}

html[lang="en"] body {
    font-family: "Segoe UI", Arial, sans-serif;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
    background-size: 72px 72px;
    mask-image: linear-gradient(to bottom, transparent, black 16%, black 84%, transparent);
    animation: gridDrift 18s linear infinite;
}

body::after {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background: repeating-linear-gradient(
        90deg,
        rgba(77, 244, 220, 0.055) 0,
        rgba(77, 244, 220, 0.055) 1px,
        transparent 1px,
        transparent 18px
    );
    opacity: 0.28;
    animation: geneScan 12s linear infinite;
}

@keyframes gridDrift {
    from {
        background-position: 0 0, 0 0;
    }
    to {
        background-position: 72px 72px, 72px 72px;
    }
}

@keyframes geneScan {
    from {
        transform: translateX(0);
    }
    to {
        transform: translateX(72px);
    }
}

a {
    color: inherit;
    text-decoration: none;
}

button,
a {
    -webkit-tap-highlight-color: transparent;
}

p,
h1,
h2,
h3 {
    margin: 0;
}

p {
    line-height: 2;
}

ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

::selection {
    color: #071016;
    background: var(--aqua);
}

.skip-link {
    position: fixed;
    inset-inline-start: 1rem;
    top: 1rem;
    z-index: 100;
    padding: 0.7rem 1rem;
    border-radius: 999px;
    color: #071016;
    background: var(--gold);
    transform: translateY(-150%);
    transition: transform 0.2s ease;
}

.skip-link:focus {
    transform: translateY(0);
}

#molecular-bg,
.css-particles {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

#molecular-bg {
    z-index: 1;
}

.css-particles {
    z-index: 2;
}

.css-particle {
    position: absolute;
    width: var(--size);
    height: var(--size);
    border-radius: 50%;
    background: var(--color);
    box-shadow: 0 0 12px var(--color);
    opacity: 0;
    animation: particleFloat var(--duration) var(--delay) infinite var(--ease);
}

@keyframes particleFloat {
    0% {
        opacity: 0;
        transform: translate3d(0, 105vh, 0) scale(0.35);
    }
    15%,
    78% {
        opacity: var(--opacity);
    }
    100% {
        opacity: 0;
        transform: translate3d(var(--drift), -12vh, 0) scale(0.8);
    }
}

.site-header {
    position: fixed;
    inset-inline: 0;
    top: 0;
    z-index: 50;
    padding: 1rem;
}

.top-nav {
    width: min(var(--max), calc(100% - 1rem));
    min-height: 68px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 1rem;
    padding: 0.7rem;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: rgba(7, 10, 18, 0.7);
    box-shadow: 0 20px 60px var(--shadow);
    backdrop-filter: blur(22px);
}

.brand,
.nav-links,
.language-switch {
    position: relative;
    z-index: 2;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.7rem;
    min-width: 0;
    padding-inline: 0.8rem;
    font-weight: 800;
    white-space: nowrap;
}

.brand span:last-child {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
}

.brand-mark {
    width: 34px;
    height: 34px;
    flex: 0 0 auto;
    border-radius: 50%;
    border: 1px solid rgba(77, 244, 220, 0.75);
    background:
        linear-gradient(90deg, transparent 40%, rgba(255, 209, 102, 0.75) 41%, transparent 43%),
        conic-gradient(from 90deg, var(--aqua), var(--coral), var(--gold), var(--green), var(--aqua));
    box-shadow: 0 0 26px rgba(77, 244, 220, 0.35);
    animation: brandSpin 9s linear infinite;
}

@keyframes brandSpin {
    to {
        transform: rotate(360deg);
    }
}

.nav-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    min-width: 0;
}

.nav-links a,
.language-switch a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0.45rem 0.8rem;
    border-radius: 999px;
    color: var(--muted);
    font-size: 0.95rem;
    transition: color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.nav-links a:hover,
.language-switch a:hover,
.language-switch a.is-active {
    color: var(--text);
    background: rgba(255, 255, 255, 0.09);
}

.nav-links a.is-current {
    color: #051016;
    background: var(--aqua);
}

.language-switch {
    display: inline-flex;
    align-items: center;
    gap: 0.2rem;
    padding: 0.2rem;
    border: 1px solid var(--line);
    border-radius: 999px;
}

.nav-toggle {
    display: none;
    width: 46px;
    height: 46px;
    border: 1px solid var(--line);
    border-radius: 50%;
    color: var(--text);
    background: rgba(255, 255, 255, 0.06);
}

.nav-toggle-line {
    display: block;
    width: 18px;
    height: 2px;
    margin: 4px auto;
    border-radius: 2px;
    background: currentColor;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

main,
.site-footer {
    position: relative;
    z-index: 5;
}

.section-screen {
    min-height: 92svh;
    padding-top: 8.5rem;
    padding-bottom: 4rem;
    display: grid;
    align-items: center;
}

.section-band {
    padding: 6.5rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    background:
        linear-gradient(180deg, rgba(5, 7, 13, 0.36), rgba(16, 20, 28, 0.58)),
        transparent;
}

.section-inner {
    width: min(var(--max), calc(100% - 2rem));
    margin: 0 auto;
}

.hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.12fr) minmax(300px, 0.72fr);
    align-items: center;
    gap: 2rem;
}

.hero-copy {
    max-width: 780px;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    margin-bottom: 1rem;
    color: var(--aqua);
    font-size: 0.92rem;
    font-weight: 800;
}

.eyebrow::before {
    content: "";
    width: 42px;
    height: 2px;
    border-radius: 2px;
    background: linear-gradient(90deg, var(--aqua), var(--gold), var(--coral));
    animation: linePulse 2.6s ease-in-out infinite;
}

@keyframes linePulse {
    50% {
        width: 74px;
        filter: drop-shadow(0 0 10px rgba(77, 244, 220, 0.8));
    }
}

h1 {
    max-width: 900px;
    font-size: 5.4rem;
    line-height: 1.06;
    font-weight: 950;
    text-wrap: balance;
    text-shadow: 0 0 44px rgba(65, 199, 255, 0.32);
    animation: titleGlow 4.8s ease-in-out infinite;
}

@keyframes titleGlow {
    50% {
        text-shadow: 0 0 66px rgba(255, 111, 117, 0.34), 0 0 36px rgba(77, 244, 220, 0.28);
    }
}

.hero-role {
    margin-top: 1.2rem;
    color: var(--gold);
    font-size: 1.35rem;
    font-weight: 800;
}

.hero-intro {
    max-width: 760px;
    margin-top: 1rem;
    color: var(--muted);
    font-size: 1.05rem;
}

.hero-actions,
.metric-row,
.focus-strip,
.signal-list,
.tag-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
}

.hero-actions {
    margin-top: 2rem;
}

.button {
    position: relative;
    isolation: isolate;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 52px;
    min-width: 160px;
    padding: 0.85rem 1.25rem;
    border: 1px solid var(--line);
    border-radius: 999px;
    overflow: hidden;
    font-weight: 800;
    transition: transform 0.25s ease, border-color 0.25s ease;
}

.button::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.22), transparent);
    transform: translateX(-110%);
    animation: buttonSweep 4s ease-in-out infinite;
}

@keyframes buttonSweep {
    45%,
    100% {
        transform: translateX(110%);
    }
}

.button:hover {
    transform: translateY(-3px);
    border-color: var(--line-strong);
}

.button-primary {
    color: #041016;
    background: linear-gradient(135deg, var(--aqua), var(--gold));
    box-shadow: 0 18px 46px rgba(77, 244, 220, 0.18);
}

.button-secondary {
    color: var(--text);
    background: rgba(255, 255, 255, 0.07);
}

.metric-row {
    margin-top: 2rem;
}

.metric {
    min-width: 148px;
    min-height: 94px;
    padding: 1rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.055);
    box-shadow: 0 14px 35px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(14px);
}

.metric strong {
    display: block;
    color: var(--text);
    font-size: 1.55rem;
    line-height: 1.2;
}

.metric span {
    display: block;
    margin-top: 0.35rem;
    color: var(--muted);
    font-size: 0.9rem;
}

.hero-panel,
.contact-panel {
    position: relative;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: linear-gradient(160deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.035));
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.35);
    backdrop-filter: blur(22px);
}

.hero-panel {
    min-height: 430px;
    padding: 1.4rem;
    animation: panelFloat 7s ease-in-out infinite;
}

@keyframes panelFloat {
    50% {
        transform: translateY(-10px);
    }
}

.hero-panel::before,
.publication-card::before,
.skill-card::before,
.research-item::before,
.contact-panel::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: linear-gradient(120deg, transparent 0%, rgba(77, 244, 220, 0.16) 38%, transparent 72%);
    transform: translateX(-100%);
    animation: surfaceSweep 7s ease-in-out infinite;
}

@keyframes surfaceSweep {
    42%,
    100% {
        transform: translateX(100%);
    }
}

.panel-kicker,
.publication-meta,
.timeline-place,
.tag-row {
    color: var(--muted);
    font-size: 0.9rem;
}

.hero-panel h2 {
    margin-top: 0.45rem;
    font-size: 2rem;
    line-height: 1.35;
}

.signal-list {
    margin-top: 1.4rem;
}

.signal-list span,
.focus-strip span,
.tag-row {
    min-height: 36px;
    padding: 0.45rem 0.75rem;
    border: 1px solid rgba(255, 255, 255, 0.13);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.07);
}

.helix-meter {
    position: absolute;
    inset-inline: 1.4rem;
    bottom: 1.4rem;
    height: 190px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 8px;
    overflow: hidden;
    background:
        repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.08) 0 1px, transparent 1px 24px),
        linear-gradient(135deg, rgba(77, 244, 220, 0.13), rgba(255, 111, 117, 0.08));
}

.helix-meter span {
    position: absolute;
    width: 140%;
    height: 3px;
    inset-inline-start: -20%;
    top: 18%;
    background: linear-gradient(90deg, transparent, var(--aqua), var(--gold), var(--coral), transparent);
    transform-origin: center;
    animation: helixRail 2.8s ease-in-out infinite;
}

.helix-meter span:nth-child(1) {
    top: 18%;
}

.helix-meter span:nth-child(2) {
    top: 39%;
    animation-delay: 0.25s;
}

.helix-meter span:nth-child(3) {
    top: 60%;
    animation-delay: 0.5s;
}

.helix-meter span:nth-child(4) {
    top: 81%;
    animation-delay: 0.75s;
}

@keyframes helixRail {
    0%,
    100% {
        transform: translateY(-20px) rotate(-8deg) scaleX(0.72);
        opacity: 0.45;
    }
    50% {
        transform: translateY(20px) rotate(8deg) scaleX(1);
        opacity: 1;
    }
}

.split-layout {
    display: grid;
    grid-template-columns: minmax(260px, 0.82fr) minmax(0, 1.18fr);
    gap: 3rem;
    align-items: start;
}

.section-heading {
    max-width: 780px;
    margin-bottom: 2.2rem;
}

h2 {
    font-size: 3.1rem;
    line-height: 1.18;
    text-wrap: balance;
}

h3 {
    font-size: 1.2rem;
    line-height: 1.55;
}

.section-heading p:not(.eyebrow),
.profile-text p,
.research-item p,
.publication-card p,
.timeline-item p,
.contact-panel p {
    color: var(--muted);
}

.profile-band {
    background:
        linear-gradient(90deg, rgba(255, 209, 102, 0.08), transparent 32%),
        linear-gradient(180deg, rgba(5, 7, 13, 0.48), rgba(13, 16, 24, 0.72));
}

.focus-strip {
    margin-top: 1.4rem;
}

.research-grid,
.skills-grid,
.publication-grid {
    display: grid;
    gap: 1rem;
}

.research-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.research-item,
.skill-card,
.publication-card,
.timeline-item {
    position: relative;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.055);
    backdrop-filter: blur(16px);
    transition: transform 0.28s ease, border-color 0.28s ease, background 0.28s ease;
}

.research-item:hover,
.skill-card:hover,
.publication-card:hover,
.timeline-item:hover {
    transform: translateY(-6px);
    border-color: var(--line-strong);
    background: rgba(255, 255, 255, 0.08);
}

.research-item {
    min-height: 290px;
    padding: 1.35rem;
}

.research-node {
    width: 54px;
    height: 54px;
    margin-bottom: 1.1rem;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.18);
    background:
        linear-gradient(90deg, transparent 35%, rgba(255, 255, 255, 0.75) 36%, transparent 40%),
        conic-gradient(from 120deg, var(--aqua), var(--gold), var(--coral), var(--green), var(--aqua));
    box-shadow: 0 0 26px rgba(255, 209, 102, 0.16);
    animation: nodePulse 3.5s ease-in-out infinite;
}

@keyframes nodePulse {
    50% {
        transform: rotate(180deg) scale(1.08);
        box-shadow: 0 0 42px rgba(77, 244, 220, 0.24);
    }
}

.skills-band {
    background:
        linear-gradient(90deg, transparent, rgba(77, 244, 220, 0.07), transparent),
        rgba(7, 10, 18, 0.48);
}

.skills-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.skill-card {
    min-height: 360px;
    padding: 1.25rem;
}

.skill-card h3 {
    color: var(--gold);
    margin-bottom: 1rem;
}

.skill-card li {
    position: relative;
    padding-block: 0.62rem;
    padding-inline-start: 1.4rem;
    color: var(--muted);
    line-height: 1.75;
}

.skill-card li::before {
    content: "";
    position: absolute;
    inset-inline-start: 0;
    top: 1.35rem;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--aqua);
    box-shadow: 0 0 14px var(--aqua);
    animation: listPulse 2.4s ease-in-out infinite;
}

@keyframes listPulse {
    50% {
        transform: scale(1.45);
        background: var(--coral);
        box-shadow: 0 0 18px var(--coral);
    }
}

.certificates-band {
    background:
        linear-gradient(135deg, rgba(255, 209, 102, 0.08), transparent 28%),
        linear-gradient(315deg, rgba(255, 111, 117, 0.08), transparent 34%),
        rgba(6, 12, 18, 0.62);
}

.certificate-heading {
    max-width: 860px;
}

.certificate-showcase {
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    grid-auto-flow: dense;
    gap: 1rem;
}

.certificate-card {
    position: relative;
    grid-column: span 4;
    min-height: 430px;
    display: grid;
    grid-template-rows: auto 1fr;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 8px;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.09), rgba(255, 255, 255, 0.04)),
        rgba(255, 255, 255, 0.055);
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.22);
    backdrop-filter: blur(16px);
    transition: transform 0.28s ease, border-color 0.28s ease, box-shadow 0.28s ease;
}

.certificate-card:nth-child(1),
.certificate-card:nth-child(2) {
    grid-column: span 6;
}

.certificate-card.is-portrait {
    grid-row: span 2;
}

.certificate-card::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background:
        linear-gradient(120deg, transparent, rgba(255, 209, 102, 0.18), transparent),
        repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.055) 0 1px, transparent 1px 18px);
    opacity: 0.45;
    transform: translateX(-100%);
    animation: certificateSweep 8s ease-in-out infinite;
}

@keyframes certificateSweep {
    44%,
    100% {
        transform: translateX(100%);
    }
}

.certificate-card:hover {
    transform: translateY(-7px);
    border-color: var(--line-strong);
    box-shadow: 0 32px 90px rgba(0, 0, 0, 0.32);
}

.certificate-image {
    position: relative;
    display: block;
    aspect-ratio: 1.42;
    margin: 0.7rem;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 6px;
    background:
        linear-gradient(135deg, rgba(77, 244, 220, 0.12), rgba(255, 209, 102, 0.08)),
        #edf3f5;
}

.certificate-card.is-portrait .certificate-image {
    aspect-ratio: 0.72;
}

.certificate-image::after {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: linear-gradient(180deg, transparent 56%, rgba(5, 7, 13, 0.22));
}

.certificate-image img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: contain;
    transition: transform 0.45s var(--ease), filter 0.45s var(--ease);
}

.certificate-card:hover .certificate-image img {
    transform: scale(1.035);
    filter: saturate(1.08) contrast(1.04);
}

.certificate-body {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    padding: 0.2rem 1rem 1.1rem;
}

.certificate-topline {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.8rem;
    margin-bottom: 0.75rem;
}

.certificate-topline span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    flex: 0 0 auto;
    border-radius: 50%;
    color: #041016;
    background: linear-gradient(135deg, var(--gold), var(--aqua));
    font-weight: 950;
}

.certificate-topline small {
    min-height: 34px;
    display: inline-flex;
    align-items: center;
    padding: 0.35rem 0.7rem;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 999px;
    color: var(--muted);
    background: rgba(255, 255, 255, 0.065);
    text-align: center;
}

.certificate-body h3 {
    font-size: 1.08rem;
    overflow-wrap: anywhere;
}

.certificate-body p {
    margin-top: 0.6rem;
    color: var(--muted);
    font-size: 0.94rem;
}

.certificate-link {
    width: fit-content;
    margin-top: auto;
    padding-top: 1rem;
    color: var(--aqua);
    font-weight: 850;
    transition: color 0.2s ease, transform 0.2s ease;
}

.certificate-link:hover {
    color: var(--gold);
    transform: translateX(3px);
}

html[dir="rtl"] .certificate-link:hover {
    transform: translateX(-3px);
}

.publication-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.publication-card {
    min-height: 332px;
    padding: 1.35rem;
}

.publication-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    margin-bottom: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 50%;
    color: #041016;
    background: linear-gradient(135deg, var(--gold), var(--aqua));
    font-weight: 950;
}

.publication-card h3 {
    overflow-wrap: anywhere;
}

.publication-meta {
    margin: 0.8rem 0;
}

.tag-row {
    display: inline-flex;
    width: fit-content;
    max-width: 100%;
    margin-top: 1rem;
}

.timeline {
    position: relative;
    display: grid;
    gap: 1rem;
}

.timeline::before {
    content: "";
    position: absolute;
    inset-block: 0.9rem;
    inset-inline-start: 15px;
    width: 2px;
    background: linear-gradient(var(--aqua), var(--gold), var(--coral));
    opacity: 0.5;
}

html[dir="rtl"] .timeline::before {
    inset-inline-start: auto;
    inset-inline-end: 15px;
}

.timeline-item {
    min-height: 176px;
    padding: 1.15rem 1.15rem 1.15rem 3.25rem;
}

html[dir="rtl"] .timeline-item {
    padding: 1.15rem 3.25rem 1.15rem 1.15rem;
}

.timeline-dot {
    position: absolute;
    inset-inline-start: 0.42rem;
    top: 1.35rem;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--aqua);
    box-shadow: 0 0 22px var(--aqua);
    animation: timelineBeat 2.2s ease-in-out infinite;
}

html[dir="rtl"] .timeline-dot {
    inset-inline-start: auto;
    inset-inline-end: 0.42rem;
}

@keyframes timelineBeat {
    50% {
        transform: scale(1.25);
        background: var(--gold);
        box-shadow: 0 0 28px var(--gold);
    }
}

.timeline-place {
    margin: 0.3rem 0 0.35rem;
    color: var(--gold);
}

.contact-band {
    padding-bottom: 5rem;
}

.contact-panel {
    max-width: 920px;
    padding: 2rem;
    text-align: center;
}

.contact-panel .eyebrow {
    justify-content: center;
}

.contact-panel h2 {
    margin-bottom: 1rem;
}

.contact-panel .button {
    margin-top: 1.4rem;
}

.site-footer {
    padding: 1.5rem 0 2rem;
    color: var(--muted);
    background: rgba(5, 7, 13, 0.76);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    font-size: 0.92rem;
}

[data-reveal] {
    opacity: 0;
    transform: translateY(34px);
    transition: opacity 0.75s var(--ease), transform 0.75s var(--ease);
}

[data-reveal].is-visible {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 1120px) {
    .top-nav {
        grid-template-columns: auto auto auto;
    }

    .nav-toggle {
        display: inline-block;
    }

    .nav-links {
        position: absolute;
        inset-inline: 0;
        top: calc(100% + 0.6rem);
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 0.35rem;
        padding: 0.75rem;
        border: 1px solid var(--line);
        border-radius: 8px;
        background: rgba(7, 10, 18, 0.94);
        box-shadow: 0 24px 60px var(--shadow);
        backdrop-filter: blur(22px);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-8px);
        transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
    }

    body.nav-open .nav-links {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .hero-grid,
    .split-layout {
        grid-template-columns: 1fr;
    }

    .hero-panel {
        min-height: 360px;
    }

    .skills-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .certificate-card,
    .certificate-card:nth-child(1),
    .certificate-card:nth-child(2) {
        grid-column: span 6;
    }
}

@media (max-width: 820px) {
    .section-screen {
        min-height: auto;
        padding-top: 7.5rem;
    }

    .section-band {
        padding: 4.5rem 0;
    }

    h1 {
        font-size: 3.8rem;
    }

    h2 {
        font-size: 2.35rem;
    }

    .research-grid,
    .publication-grid,
    .skills-grid,
    .certificate-showcase {
        grid-template-columns: 1fr;
    }

    .skill-card,
    .publication-card,
    .research-item,
    .certificate-card,
    .certificate-card:nth-child(1),
    .certificate-card:nth-child(2) {
        grid-column: auto;
        min-height: auto;
    }

    .certificate-card.is-portrait {
        grid-row: auto;
    }

    .certificate-card.is-portrait .certificate-image {
        aspect-ratio: 1.05;
    }
}

@media (max-width: 600px) {
    .site-header {
        padding: 0.65rem;
    }

    .top-nav {
        width: 100%;
        min-height: 62px;
        grid-template-columns: 1fr auto auto;
        gap: 0.4rem;
        padding: 0.45rem;
        border-radius: 8px;
    }

    .brand {
        padding-inline: 0.35rem;
        font-size: 0.92rem;
    }

    .brand-mark {
        width: 30px;
        height: 30px;
    }

    .language-switch a {
        min-height: 36px;
        padding: 0.35rem 0.55rem;
        font-size: 0.85rem;
    }

    .nav-toggle {
        width: 40px;
        height: 40px;
    }

    .nav-links {
        grid-template-columns: 1fr;
    }

    .section-inner {
        width: min(var(--max), calc(100% - 1rem));
    }

    h1 {
        font-size: 2.9rem;
    }

    h2 {
        font-size: 2rem;
    }

    .hero-role {
        font-size: 1.08rem;
    }

    .hero-actions,
    .button,
    .metric {
        width: 100%;
    }

    .metric-row {
        align-items: stretch;
    }

    .metric {
        min-width: 0;
    }

    .hero-panel {
        min-height: 330px;
    }

    .helix-meter {
        height: 150px;
    }

    .contact-panel {
        padding: 1.35rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
    }
}