/* Site-wide styles. Tool pages also load css/sqs-to-poscar.css for their widgets,
   so rules here are scoped to body.site / body.tool-page or use class names
   that style.css does not. */

:root {
    --bg: #fdfdfb;
    --text: #222;
    --muted: #666;
    --faint: #8a8a8a;
    --rule: #e2e0da;
    --link: #1a5e8a;
    --link-hover: #0d3d5c;
    --band: #f3f1ea;
    --frame: #ffffff;
    --grain-dark: 0;
    --measure: 760px;
    --wide: 1040px;
    --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
    --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg: #16181a;
        --text: #e4e2dd;
        --muted: #a3a09a;
        --faint: #85827c;
        --rule: #2f3133;
        --link: #8cc1e6;
        --link-hover: #b9dbf2;
        --band: #1c1f22;
        --frame: #e9ecee;
        --grain-dark: 1;
    }
}

:root[data-theme="dark"] {
    --bg: #16181a;
    --text: #e4e2dd;
    --muted: #a3a09a;
    --faint: #85827c;
    --rule: #2f3133;
    --link: #8cc1e6;
    --link-hover: #b9dbf2;
    --band: #1c1f22;
    --frame: #e9ecee;
    --grain-dark: 1;
}

/* ---------- Base ---------- */

body.site {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--serif);
    font-size: 18px;
    line-height: 1.6;
}

body.site a {
    color: var(--link);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
    text-decoration-color: color-mix(in srgb, var(--link) 35%, transparent);
}

body.site a:hover {
    color: var(--link-hover);
    text-decoration-color: currentColor;
}

body.site h1,
body.site h2,
body.site h3 {
    font-weight: 600;
    line-height: 1.25;
    margin: 0;
}

body.site h2 {
    font-size: 1.35rem;
    margin: 48px 0 16px;
}

body.site p {
    margin: 0 0 16px;
}

body.site code {
    font-size: 0.85em;
}

.wrap {
    max-width: var(--measure);
    margin: 0 auto;
    padding: 0 24px;
}

@media (max-width: 600px) {
    body.site {
        font-size: 17px;
    }

    .wrap {
        padding: 0 16px;
    }
}

/* ---------- Header ---------- */

.site-header {
    border-bottom: 1px solid var(--rule);
    background: var(--bg);
    font-family: var(--sans);
}

.site-header .wrap {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 4px 24px;
    padding-top: 20px;
    padding-bottom: 16px;
}

.site-brand {
    font-family: var(--serif);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text) !important;
    text-decoration: none !important;
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 20px;
    font-size: 0.93rem;
}

.site-nav a {
    color: var(--muted) !important;
    text-decoration: none !important;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
    color: var(--text) !important;
}

.site-nav a[aria-current="page"] {
    font-weight: 600;
}

/* ---------- Home ---------- */

.intro {
    padding-top: 40px;
}

.intro::after {
    content: "";
    display: table;
    clear: both;
}

.intro h1 {
    font-size: 2rem;
    margin-bottom: 2px;
}

.intro .position {
    color: var(--muted);
    margin-bottom: 24px;
}

.portrait {
    float: right;
    width: 190px;
    height: auto;
    margin: 6px 0 16px 32px;
    border-radius: 3px;
}

@media (max-width: 600px) {
    .portrait {
        float: none;
        display: block;
        width: 140px;
        margin: 0 0 20px;
    }
}

.contact {
    font-family: var(--sans);
    font-size: 0.9rem;
    color: var(--faint);
}

.interests {
    margin: 0;
    padding-left: 20px;
}

.interests li {
    margin-bottom: 6px;
}

.see-all {
    font-family: var(--sans);
    font-size: 0.9rem;
}

/* ---------- Publication lists ---------- */

.pubs {
    list-style: none;
    margin: 0;
    padding: 0;
}

.pubs li {
    margin-bottom: 18px;
}

.pubs .title {
    display: block;
    font-weight: 600;
}

.pubs .authors,
.pubs .venue {
    display: block;
    font-size: 0.95rem;
}

.pubs .authors {
    color: var(--muted);
}

.pubs .me {
    color: var(--text);
    font-weight: 600;
}

.pubs .links {
    font-family: var(--sans);
    font-size: 0.8rem;
    margin-left: 6px;
}

.pubs .links a {
    margin-right: 8px;
}

.year-head {
    font-family: var(--sans);
    font-size: 0.9rem !important;
    color: var(--faint);
    margin: 36px 0 12px !important;
}

/* ---------- Software lists ---------- */

.projects {
    list-style: none;
    margin: 0;
    padding: 0;
}

.projects li {
    margin-bottom: 20px;
}

.projects .name {
    font-weight: 600;
}

.projects .meta {
    font-family: var(--sans);
    font-size: 0.8rem;
    color: var(--faint);
    margin-left: 6px;
}

.projects p {
    margin: 2px 0 0 !important;
    font-size: 0.97rem;
}

/* ---------- Inner page title ---------- */

.page-title {
    font-size: 1.8rem;
    margin: 40px 0 12px !important;
}

/* ---------- Footer ---------- */

.site-footer {
    margin-top: 72px;
    border-top: 1px solid var(--rule);
    padding: 20px 0 40px;
    font-family: var(--sans);
    font-size: 0.85rem;
    color: var(--faint);
    background: var(--bg);
}

.site-footer .wrap {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px 24px;
}

.site-footer a {
    color: var(--muted) !important;
    text-decoration: none !important;
}

.site-footer a + a {
    margin-left: 14px;
}

.site-footer a:hover {
    color: var(--text) !important;
}

/* ---------- Tool pages ---------- */

body.tool-page {
    background: var(--bg) !important;
    color: var(--text);
}

body.tool-page .wrap {
    max-width: 1140px;
}

.tool-intro {
    padding-top: 28px;
    padding-bottom: 8px;
}

.tool-intro a {
    font-family: var(--sans);
    font-size: 0.88rem;
    color: var(--link);
    text-decoration: none;
}

.tool-intro h1 {
    font-family: var(--serif);
    font-size: 1.8rem;
    font-weight: 600;
    margin: 8px 0;
    color: var(--text);
}

.tool-intro p {
    color: var(--muted);
    max-width: 75ch;
}

.tool-body canvas {
    max-width: 100%;
    height: auto;
}

.tool-body .parameters-container,
.tool-body .controls-container {
    max-width: 100%;
}

body.tool-page .file-name {
    color: var(--text);
    font-size: 1.05rem;
    font-weight: 600;
    text-align: left;
}

body.tool-page .btn-primary {
    background: var(--link);
    border-color: var(--link);
}

body.tool-page .btn-primary:hover {
    background: var(--link-hover);
    border-color: var(--link-hover);
}

body.tool-page button:not(.btn) {
    background-color: #3b4650;
}

@media (max-width: 820px) {
    .tool-body .column {
        float: none;
        width: 100%;
    }

    .tool-body .parameters-container {
        width: auto;
    }
}


/* ==========================================================================
   Homepage
   ========================================================================== */

.wide {
    max-width: var(--wide);
    margin: 0 auto;
    padding: 0 24px;
}

@media (max-width: 600px) {
    .wide {
        padding: 0 16px;
    }
}

/* ---------- Header band with live simulation ---------- */

.masthead {
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid var(--rule);
}

#grain-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
}

.masthead::before {
    /* Fade the simulation out behind the text column. */
    content: "";
    position: absolute;
    inset: 0;
    z-index: 1;
    background: linear-gradient(90deg, var(--bg) 0%, color-mix(in srgb, var(--bg) 92%, transparent) 42%,
            color-mix(in srgb, var(--bg) 30%, transparent) 75%, transparent 100%);
    pointer-events: none;
}

.masthead-inner {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 220px;
    gap: 48px;
    align-items: center;
    padding-top: 64px;
    padding-bottom: 64px;
}

.masthead h1 {
    font-size: clamp(2.2rem, 4.6vw, 3.1rem) !important;
    letter-spacing: -0.015em;
    margin-bottom: 6px !important;
}

.masthead .position {
    font-family: var(--sans);
    font-size: 0.98rem;
    color: var(--muted);
    margin-bottom: 22px !important;
}

.masthead .summary {
    font-size: 1.12rem;
    max-width: 36em;
}

.masthead .portrait {
    float: none;
    width: 220px;
    margin: 0;
    border-radius: 4px;
    border: 5px solid var(--frame);
    box-shadow: 0 6px 24px rgb(0 0 0 / 12%);
}

.masthead .contact {
    margin-top: 22px;
    margin-bottom: 0 !important;
}

.sim-caption {
    position: absolute;
    right: 16px;
    bottom: 10px;
    z-index: 2;
    font-family: var(--sans);
    font-size: 0.72rem;
    color: var(--muted);
    background: color-mix(in srgb, var(--bg) 75%, transparent);
    padding: 2px 8px;
    border-radius: 3px;
}

@media (max-width: 760px) {
    .masthead-inner {
        grid-template-columns: 1fr;
        gap: 24px;
        padding-top: 36px;
        padding-bottom: 48px;
    }

    .masthead .portrait {
        width: 140px;
        order: -1;
    }

    .masthead::before {
        background: color-mix(in srgb, var(--bg) 86%, transparent);
    }
}

/* ---------- Two-column intro + news ---------- */

.home-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 56px;
    padding-top: 12px;
}

@media (max-width: 820px) {
    .home-grid {
        grid-template-columns: 1fr;
        gap: 0;
    }
}

.news {
    list-style: none;
    margin: 0;
    padding: 0;
    font-size: 0.95rem;
}

.news li {
    display: grid;
    grid-template-columns: 76px 1fr;
    gap: 12px;
    padding: 10px 0;
    border-bottom: 1px solid var(--rule);
}

.news li:first-child {
    padding-top: 0;
}

.news time {
    font-family: var(--sans);
    font-size: 0.8rem;
    color: var(--faint);
    padding-top: 3px;
}

/* ---------- Research highlights ---------- */

.band {
    background: var(--band);
    border-top: 1px solid var(--rule);
    border-bottom: 1px solid var(--rule);
    margin-top: 56px;
    padding: 8px 0 48px;
}

.band h2 {
    margin-top: 40px !important;
}

.section-intro {
    color: var(--muted);
    max-width: 44em;
}

.highlight {
    margin: 28px 0 0;
}

.highlight h3 {
    font-size: 1.15rem;
    margin: 0 0 6px;
}

.highlight p {
    font-size: 0.98rem;
    margin-bottom: 8px !important;
}

.highlight .ref {
    font-family: var(--sans);
    font-size: 0.8rem;
    color: var(--faint);
}

.figure {
    margin: 0 0 14px;
    background: var(--frame);
    border: 1px solid var(--rule);
    border-radius: 4px;
    padding: 10px;
}

.figure img {
    display: block;
    width: 100%;
    height: auto;
}

.figure figcaption {
    font-family: var(--sans);
    font-size: 0.75rem;
    color: #6b6b6b;
    margin-top: 8px;
    line-height: 1.45;
}

.highlight-pair {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

@media (max-width: 760px) {
    .highlight-pair {
        grid-template-columns: 1fr;
        gap: 0;
    }
}

.also {
    margin-top: 32px;
    font-size: 0.98rem;
}

/* ---------- Year-column publication list ---------- */

.pubs.dated li {
    display: grid;
    grid-template-columns: 56px 1fr;
    gap: 12px;
}

.pubs.dated .yr {
    font-family: var(--sans);
    font-size: 0.85rem;
    color: var(--faint);
    padding-top: 3px;
}

@media (max-width: 600px) {
    .pubs.dated li {
        grid-template-columns: 1fr;
        gap: 0;
    }
}

/* ---------- Software feature ---------- */

.feature {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 36px;
    align-items: start;
}

@media (max-width: 820px) {
    .feature {
        grid-template-columns: 1fr;
        gap: 8px;
    }
}

.feature h3 {
    font-size: 1.3rem;
    margin: 0 0 4px;
}

.feature .meta,
.tool-grid .meta {
    font-family: var(--sans);
    font-size: 0.8rem;
    color: var(--faint);
}

.feature ul {
    padding-left: 20px;
    margin: 10px 0 14px;
    font-size: 0.97rem;
}

.text-links {
    font-family: var(--sans);
    font-size: 0.9rem;
}

.text-links a + a {
    margin-left: 14px;
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
    margin-top: 36px;
    padding-top: 28px;
    border-top: 1px solid var(--rule);
}

@media (max-width: 760px) {
    .tool-grid {
        grid-template-columns: 1fr;
        gap: 18px;
    }
}

.tool-grid h3 {
    font-size: 1.02rem;
    margin: 0 0 2px;
}

.tool-grid p {
    font-size: 0.95rem;
    margin: 6px 0 0 !important;
}

/* Inner pages: full-width frame, readable text column. */
.inner > * {
    max-width: var(--measure);
}

@media (max-width: 760px) {
    .sim-caption {
        display: none;
    }
}

/* ==========================================================================
   Motion
   All effects are short, small in amplitude, and switched off for
   prefers-reduced-motion. Reveal styles only apply once JS has loaded
   (html.js), so content is never hidden without it.
   ========================================================================== */

:root {
    --ease-out: cubic-bezier(0.2, 0.7, 0.2, 1);
}

/* ---------- Sticky header ---------- */

body.site .site-header {
    position: sticky;
    top: 0;
    z-index: 40;
    background: color-mix(in srgb, var(--bg) 90%, transparent);
    backdrop-filter: saturate(150%) blur(8px);
    -webkit-backdrop-filter: saturate(150%) blur(8px);
    transition: box-shadow 0.3s ease, border-color 0.3s ease;
}

body.site .site-header.scrolled {
    box-shadow: 0 1px 12px rgb(0 0 0 / 7%);
}

/* Nav: underline grows from the left on hover / current page. */
.site-nav a {
    position: relative;
    padding: 2px 0;
    transition: color 0.2s ease;
}

.site-nav a::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -3px;
    height: 1.5px;
    background: currentColor;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s var(--ease-out);
}

.site-nav a:hover::after,
.site-nav a[aria-current="page"]::after {
    transform: scaleX(1);
}

/* Body links: underline colour eases in. */
body.site a {
    transition: color 0.2s ease, text-decoration-color 0.2s ease;
}

/* ---------- Masthead entrance ---------- */

@keyframes rise {
    from {
        opacity: 0;
        transform: translateY(12px);
    }

    to {
        opacity: 1;
        transform: none;
    }
}

@keyframes settle {
    from {
        opacity: 0;
        transform: scale(0.97);
    }

    to {
        opacity: 1;
        transform: none;
    }
}

@keyframes fade {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.masthead h1,
.masthead .position,
.masthead .summary,
.masthead .contact {
    animation: rise 0.8s var(--ease-out) both;
}

.masthead .position { animation-delay: 0.08s; }
.masthead .summary { animation-delay: 0.16s; }
.masthead .contact { animation-delay: 0.24s; }

.masthead .portrait {
    animation: settle 0.9s var(--ease-out) 0.15s both;
    transition: transform 0.4s var(--ease-out), box-shadow 0.4s ease;
}

.masthead .portrait:hover {
    transform: translateY(-3px) rotate(-0.6deg);
    box-shadow: 0 12px 32px rgb(0 0 0 / 16%);
}

#grain-canvas {
    animation: fade 1.2s ease both;
    cursor: crosshair;
}

/* Let clicks on empty masthead space reach the canvas. */
.masthead-inner {
    pointer-events: none;
}

.masthead-inner h1,
.masthead-inner p,
.masthead-inner img {
    pointer-events: auto;
}

.sim-caption {
    animation: fade 1s ease 1s both;
    pointer-events: none;
}

/* ---------- Scroll reveals ---------- */

html.js [data-reveal] {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.7s ease, transform 0.8s var(--ease-out);
    transition-delay: var(--reveal-delay, 0ms);
}

html.js [data-reveal].in {
    opacity: 1;
    transform: none;
}

/* ---------- Figures ---------- */

.figure {
    transition: box-shadow 0.35s ease, transform 0.35s var(--ease-out), border-color 0.35s ease;
}

.figure:has(img[data-zoom]):hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 28px rgb(0 0 0 / 9%);
}

.figure img[data-zoom] {
    cursor: zoom-in;
}

.figure img[data-zoom]:focus-visible {
    outline: 2px solid var(--link);
    outline-offset: 3px;
}

.lightbox {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: grid;
    place-items: center;
    padding: 32px 16px;
    background: rgb(12 14 16 / 82%);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0s linear 0.3s;
    cursor: zoom-out;
}

.lightbox.open {
    opacity: 1;
    visibility: visible;
    transition: opacity 0.3s ease;
}

.lightbox figure {
    margin: 0;
    max-width: min(1200px, 100%);
    background: #fff;
    padding: 14px;
    border-radius: 4px;
    transform: scale(0.96);
    transition: transform 0.35s var(--ease-out);
}

.lightbox.open figure {
    transform: none;
}

.lightbox img {
    display: block;
    max-width: 100%;
    max-height: calc(100vh - 150px);
    margin: 0 auto;
    cursor: default;
}

.lightbox figcaption {
    font-family: var(--sans);
    font-size: 0.85rem;
    color: #555;
    margin-top: 10px;
}

.lightbox-close {
    position: absolute;
    top: 14px;
    right: 18px;
    width: 40px;
    height: 40px;
    border: 0;
    border-radius: 50%;
    background: rgb(255 255 255 / 12%);
    color: #fff;
    font-size: 1.6rem;
    line-height: 1;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.lightbox-close:hover {
    background: rgb(255 255 255 / 24%);
}

/* ---------- Screenshot showcase ---------- */

.showcase .frame {
    position: relative;
    aspect-ratio: 1000 / 538;
    overflow: hidden;
    border-radius: 2px;
}

.showcase .slide {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    opacity: 0;
    transform: scale(1.015);
    transition: opacity 0.9s ease, transform 5.5s ease-out;
}

.showcase .slide.active {
    opacity: 1;
    transform: scale(1);
}

/* Without JS, just show the first screenshot. */
html:not(.js) .showcase .slide:first-child {
    opacity: 1;
}

.showcase-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-top: 8px;
}

.showcase-caption {
    font-family: var(--sans);
    font-size: 0.75rem;
    color: #6b6b6b;
    animation: fade 0.5s ease;
}

.showcase-dots {
    display: flex;
    gap: 6px;
}

.showcase-dots button {
    width: 8px;
    height: 8px;
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: #c9ccd0;
    cursor: pointer;
    transition: background-color 0.25s ease, transform 0.25s ease;
}

.showcase-dots button:hover {
    transform: scale(1.3);
}

.showcase-dots button[aria-current="true"] {
    background: var(--link);
}

.showcase-progress {
    height: 2px;
    margin-top: 8px;
    background: #e6e6e6;
    overflow: hidden;
}

.showcase-progress::before {
    content: "";
    display: block;
    height: 100%;
    background: var(--link);
    transform: scaleX(0);
    transform-origin: left;
}

.showcase-progress.run::before {
    animation: progress 5s linear forwards;
}

.showcase.paused .showcase-progress.run::before {
    animation-play-state: paused;
}

@keyframes progress {
    to {
        transform: scaleX(1);
    }
}

/* ---------- News rows ---------- */

.news li {
    transition: background-color 0.25s ease;
}

/* ---------- Reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {

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

    html.js [data-reveal] {
        opacity: 1;
        transform: none;
    }
}

@media (max-width: 560px) {
    .site-nav {
        gap: 6px 16px;
        font-size: 0.9rem;
    }
}

/* ---------- Web tools dropdown ---------- */

.nav-drop {
    position: relative;
}

.nav-drop-toggle {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.nav-drop-toggle svg {
    width: 12px;
    height: 12px;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.5;
    stroke-linecap: round;
    stroke-linejoin: round;
    transition: transform 0.2s ease;
}

.nav-menu {
    position: absolute;
    top: 100%;
    right: -12px;
    z-index: 50;
    display: grid;
    width: 300px;
    margin-top: 10px;
    padding: 6px;
    border: 1px solid var(--rule);
    border-radius: 10px;
    background: var(--bg);
    box-shadow: 0 10px 30px rgb(0 0 0 / 12%);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s;
}

/* Bridge the gap between the toggle and the menu so hover is not lost. */
.nav-menu::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: -12px;
    height: 12px;
}

.nav-drop:hover .nav-menu,
.nav-drop:focus-within .nav-menu {
    opacity: 1;
    visibility: visible;
    transform: none;
}

.nav-drop:hover .nav-drop-toggle svg,
.nav-drop:focus-within .nav-drop-toggle svg {
    transform: rotate(180deg);
}

.site-nav .nav-menu a {
    display: grid;
    gap: 1px;
    padding: 8px 10px;
    border-radius: 7px;
    color: var(--text) !important;
}

.site-nav .nav-menu a::after {
    display: none;
}

.site-nav .nav-menu a:hover,
.site-nav .nav-menu a:focus-visible {
    background: var(--band);
}

.nav-menu b {
    font-weight: 600;
    font-size: 0.92rem;
}

.nav-menu span {
    color: var(--muted);
    font-size: 0.8rem;
}

@media (max-width: 560px) {
    .site-nav {
        position: relative;
    }

    .nav-drop {
        position: static;
    }

    .nav-menu {
        right: 0;
        width: min(290px, calc(100vw - 32px));
    }
}