/* ============================================================
   LG—H · lab-notebook theme. Dark by default, light on demand.
   Serif display (Newsreader) + mono labels (JetBrains Mono).
   No frameworks, no trackers.
   ============================================================ */

:root,
[data-theme="dark"] {
    --bg: #0b0d0c;
    --bg2: #0f1211;
    --surface: #131716;
    --surface2: #191f1d;
    --line: #26302b;
    --line-soft: #1c2320;
    --ink: #e9eee6;
    --muted: #a9b4a9;
    --faint: #6e7a71;
    --lime: #c8f04b;
    --lime-ink: #1a2005;
    --amber: #ffa14a;
    --red: #ff6f6f;
    --serif: "Newsreader", Georgia, "Times New Roman", serif;
    --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    --sans: system-ui, -apple-system, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
    --nav-h: 62px;
    --content-w: 1120px;
}

[data-theme="light"] {
    --bg: #edf0e9;
    --bg2: #e4e8dd;
    --surface: #f7f9f3;
    --surface2: #ffffff;
    --line: #c9d1c2;
    --line-soft: #dde2d5;
    --ink: #161a17;
    --muted: #4c574e;
    --faint: #7d887e;
    --lime: #4a7a00;
    --lime-ink: #f4f8e8;
    --amber: #b35400;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 14px); }

body {
    font-family: var(--sans);
    background: var(--bg);
    color: var(--ink);
    line-height: 1.65;
    font-size: 17px;
    -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; text-decoration-color: var(--lime); text-underline-offset: 3px; }
a:hover { color: var(--lime); }

::selection { background: var(--lime); color: var(--lime-ink); }

a:focus-visible, button:focus-visible, [role="button"]:focus-visible {
    outline: 2px solid var(--lime); outline-offset: 3px; border-radius: 4px;
}

.skip-link {
    position: absolute; left: -9999px; top: 0; z-index: 2000;
    background: var(--lime); color: var(--lime-ink);
    padding: 10px 16px; border-radius: 0 0 8px 0;
    font-family: var(--mono); font-size: 0.85rem; text-decoration: none;
}
.skip-link:focus { left: 0; }

.progress {
    position: fixed; top: 0; left: 0; height: 3px; width: 0%;
    background: var(--lime); z-index: 1200;
}

section.section { padding: 88px 0; }
.max-width { max-width: var(--content-w); padding: 0 32px; margin: auto; }

/* ---------- Navbar ---------- */
.navbar {
    position: fixed; top: 0; left: 0; width: 100%; height: var(--nav-h); z-index: 999;
    background: color-mix(in srgb, var(--bg) 88%, transparent);
    backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    transition: border-color 0.25s ease;
}
.navbar.sticky { border-bottom-color: var(--line); }
.nav-inner { height: var(--nav-h); display: flex; align-items: center; justify-content: space-between; gap: 16px; }

.brand { text-decoration: none; font-family: var(--mono); display: flex; align-items: baseline; gap: 8px; }
.brand-mark { font-weight: 700; font-size: 1.05rem; color: var(--ink); background: var(--lime); color: var(--lime-ink); padding: 2px 8px; border-radius: 5px; }
.brand-sub { font-size: 0.8rem; color: var(--faint); }
.brand:hover .brand-mark { color: var(--lime-ink); }

.navbar .menu { list-style: none; display: flex; align-items: center; gap: 2px; }
.menu-link { display: inline-flex; align-items: baseline; gap: 7px; text-decoration: none; font-family: var(--mono); font-size: 0.83rem; color: var(--muted); padding: 8px 12px; border-radius: 7px; }
.menu-link .link-num { font-size: 0.68rem; color: var(--faint); }
.menu-link:hover { color: var(--ink); background: var(--surface2); }
.menu-link.active { color: var(--lime); }
.menu-link.active .link-num { color: var(--lime); }

.nav-right { display: flex; align-items: center; gap: 10px; }
.nav-clock { font-family: var(--mono); font-size: 0.8rem; color: var(--faint); border: 1px solid var(--line); border-radius: 999px; padding: 4px 12px; white-space: nowrap; }
.theme-btn, .menu-btn {
    background: var(--surface); border: 1px solid var(--line); color: var(--ink);
    border-radius: 8px; padding: 8px 11px; cursor: pointer; font-size: 0.95rem; line-height: 1;
}
.theme-btn:hover, .menu-btn:hover { border-color: var(--lime); color: var(--lime); }
.menu-btn { display: none; }

/* ---------- Scroll-up ---------- */
.scroll-up-btn {
    position: fixed; right: 26px; bottom: 12px; z-index: 900;
    width: 42px; height: 44px; line-height: 44px; text-align: center;
    background: var(--lime); color: var(--lime-ink); border-radius: 9px;
    cursor: pointer; opacity: 0; pointer-events: none;
    transition: opacity 0.25s ease, bottom 0.25s ease;
}
.scroll-up-btn.show { bottom: 26px; opacity: 1; pointer-events: auto; }

/* ---------- Hero ---------- */
.hero { position: relative; padding: 36px 0 40px; overflow: hidden; background: var(--bg); }
#graph-canvas { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0.5; }
.hero-grid { position: relative; display: grid; grid-template-columns: 1.5fr 1fr; gap: 56px; align-items: start; }

.status-line {
    display: inline-flex; align-items: center; gap: 10px;
    font-family: var(--mono); font-size: 0.8rem; color: var(--muted);
    border: 1px solid var(--line); border-radius: 999px; padding: 7px 16px; margin-bottom: 26px;
    background: color-mix(in srgb, var(--surface) 80%, transparent);
}
.pulse { width: 8px; height: 8px; border-radius: 50%; background: var(--lime); animation: pulse 2s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: 0.3; } }

.hero-name {
    font-family: var(--serif); font-weight: 600; letter-spacing: -0.02em;
    font-size: clamp(2.6rem, 6vw, 4.4rem); line-height: 0.98; margin-bottom: 18px;
}
.hero-name em { font-style: italic; font-weight: 500; color: var(--lime); }

.hero-role { font-family: var(--serif); font-size: clamp(1.3rem, 2.6vw, 1.75rem); color: var(--muted); margin-bottom: 16px; min-height: 2.2em; }
.hero-role .typing { color: var(--ink); font-style: italic; border-bottom: 2px solid var(--lime); }
.caret { display: inline-block; width: 2px; height: 1em; background: var(--lime); margin-left: 3px; vertical-align: -0.12em; animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

.hero-abstract { max-width: 56ch; color: var(--muted); margin-bottom: 28px; }
.hero-abstract a, .about-text p a, .contact-rows a { color: var(--ink); }

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 24px; }
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    font-family: var(--mono); font-size: 0.88rem; font-weight: 500;
    padding: 13px 24px; border-radius: 9px; text-decoration: none; cursor: pointer;
    border: 1px solid var(--lime); transition: transform 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.btn-solid { background: var(--lime); color: var(--lime-ink); border-color: var(--lime);}
.btn-solid:hover { color: var(--lime-ink); transform: translate(-2px, -2px); box-shadow: 4px 4px 0 var(--amber); }
.btn-line { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-line:hover { color: var(--lime); border-color: var(--lime); }
.btn-sm { padding: 10px 18px; font-size: 0.82rem; }

.hero-stats { display: flex; gap: 0; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; max-width: 560px; background: var(--surface); }
.hero-stats div { flex: 1; padding: 16px 20px; }
.hero-stats div + div { border-left: 1px solid var(--line); }
.hero-stats dt { font-family: var(--serif); font-size: 1.9rem; font-weight: 700; color: var(--lime); line-height: 1.1; }
.hero-stats dd { font-family: var(--mono); font-size: 0.72rem; color: var(--faint); text-transform: uppercase; letter-spacing: 0.08em; }

.hero-right { display: flex; flex-direction: column; gap: 20px; }
.photo-card {
    background: var(--surface); border: 1px solid var(--line); border-radius: 4px 14px 4px 14px;
    padding: 12px 12px 10px; transform: rotate(1.5deg);
}
.photo-card img { border-radius: 2px 8px 2px 8px; aspect-ratio: 1 / 1; object-fit: cover; width: 100%; filter: saturate(0.85) contrast(1.05); }
.photo-card figcaption { display: flex; justify-content: space-between; font-family: var(--mono); font-size: 0.7rem; color: var(--faint); padding: 10px 4px 2px; }

.now-card { background: var(--surface2); border: 1px solid var(--line); border-top: 3px solid var(--lime); border-radius: 12px; padding: 20px 22px; }
.now-card h2 { font-family: var(--mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.14em; color: var(--faint); margin-bottom: 12px; }
.now-card ul { list-style: none; }
.now-card li { display: flex; gap: 14px; padding: 7px 0; font-size: 0.92rem; border-bottom: 1px dashed var(--line); }
.now-card li:last-child { border-bottom: none; }
.now-card .k { font-family: var(--mono); font-size: 0.72rem; color: var(--lime); text-transform: uppercase; letter-spacing: 0.08em; flex: 0 0 78px; padding-top: 4px; }
.now-link { display: inline-block; margin-top: 12px; font-family: var(--mono); font-size: 0.85rem; text-decoration: none; }

/* ---------- Ticker ---------- */
.ticker { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--lime); overflow: hidden; white-space: nowrap; }
.ticker-track { display: inline-block; padding: 10px 0; animation: tick 28s linear infinite; }
.ticker-track span { font-family: var(--mono); font-size: 0.82rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; color: var(--lime-ink); margin: 0 14px; }
.ticker-track .dot { color: var(--lime-ink); }
@keyframes tick { to { transform: translateX(-50%); } }

/* ---------- Notice strip ---------- */
.notice-strip { margin-top: var(--nav-h); border-bottom: 1px solid var(--line); background: var(--surface); }
.notice-inner { display: flex; gap: 12px; align-items: center; padding-top: 10px; padding-bottom: 10px; }
.notice-tag { font-family: var(--mono); font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; background: var(--lime); color: var(--lime-ink); border-radius: 999px; padding: 2px 10px; flex-shrink: 0; }
.notice-strip p { font-family: var(--mono); font-size: 0.82rem; color: var(--muted); }
.notice-strip a, .now-card li a { color: var(--ink); }
.notice-strip a:hover, .now-card li a:hover { color: var(--lime); }

/* ---------- Section heads ---------- */
.section-head { margin-bottom: 38px; display: grid; gap: 6px; }
.section-num { font-family: var(--mono); font-size: 0.8rem; color: var(--lime); }
section .title { font-family: var(--serif); font-weight: 600; font-size: clamp(2rem, 4vw, 2.9rem); letter-spacing: -0.015em; line-height: 1.05; }
.section-sub { color: var(--muted); max-width: 62ch; }

.about { background: var(--bg2); border-top: 1px solid var(--line-soft); }
.about-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 48px; align-items: start; }
.about-text .lede { font-family: var(--serif); font-size: 1.35rem; line-height: 1.5; margin-bottom: 16px; }
.about-text p { margin-bottom: 14px; color: var(--muted); }
.about-text .lede, .about-text p a { color: var(--ink); }
.about-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 22px; }
.fact-sheet { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.fact-sheet div { display: grid; grid-template-columns: 110px 1fr; gap: 12px; padding: 13px 18px; font-size: 0.93rem; }
.fact-sheet div + div { border-top: 1px solid var(--line-soft); }
.fact-sheet dt { font-family: var(--mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--faint); padding-top: 4px; }

/* ---------- Research ---------- */
.filter-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.chip {
    font-family: var(--mono); font-size: 0.8rem; padding: 7px 16px; border-radius: 999px;
    background: transparent; color: var(--muted); border: 1px solid var(--line); cursor: pointer;
}
.chip:hover { border-color: var(--lime); color: var(--ink); }
.chip.active { background: var(--lime); border-color: var(--lime); color: var(--lime-ink); font-weight: 700; }

.pub-list { border-top: 1px solid var(--line); }
.pub { display: grid; grid-template-columns: 76px 1fr 48px; gap: 20px; align-items: start; padding: 24px 8px; border-bottom: 1px solid var(--line); }
.pub:hover { background: var(--surface); }
.pub[hidden] { display: none; }
.pub-year { font-family: var(--mono); font-size: 0.78rem; font-weight: 700; color: var(--lime-ink); background: var(--lime); border-radius: 6px; text-align: center; padding: 5px 0; margin-top: 3px; }
.pub-body h3 { font-family: var(--serif); font-size: 1.18rem; font-weight: 600; line-height: 1.4; margin-bottom: 6px; }
.pub-body h3 a { text-decoration: none; color: var(--ink); }
.pub-body h3 a:hover { color: var(--lime); }
.pub-authors { font-size: 0.92rem; color: var(--muted); margin-bottom: 4px; }
.pub-authors a { color: var(--muted); }
.pub-venue { font-family: var(--mono); font-size: 0.76rem; color: var(--faint); }
.tag { display: inline-block; border: 1px solid var(--line); border-radius: 999px; padding: 1px 10px; margin-left: 6px; color: var(--muted); font-size: 0.7rem; }
.pub-arrow { font-size: 1.4rem; color: var(--faint); text-decoration: none; text-align: center; }
.pub-arrow:hover { color: var(--lime); }
.pub-empty { padding: 28px 8px; color: var(--muted); font-family: var(--mono); font-size: 0.9rem; }

/* ---------- Teaching timeline ---------- */
.teaching { background: var(--bg2); border-top: 1px solid var(--line-soft); }
.timeline { display: grid; gap: 26px; }
.t-year { display: grid; grid-template-columns: 110px 1fr; gap: 24px; align-items: start; }
.t-badge { font-family: var(--mono); font-weight: 700; font-size: 0.95rem; color: var(--bg); background: var(--amber); border-radius: 8px; text-align: center; padding: 8px 4px; position: sticky; top: calc(var(--nav-h) + 16px); }
.t-cards { display: grid; gap: 12px; }
.t-card {
    display: grid; gap: 2px; background: var(--surface); border: 1px solid var(--line);
    border-left: 4px solid var(--amber); border-radius: 4px 10px 10px 4px;
    padding: 15px 20px; text-decoration: none;
}
.t-card:hover { border-color: var(--amber); }
.t-card:hover strong { color: var(--amber); }
.t-card strong { font-family: var(--serif); font-size: 1.08rem; font-weight: 600; }
.t-card span { font-size: 0.9rem; color: var(--muted); }

/* ---------- Tools ---------- */
.tool-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.tool-card {
    background: var(--surface); border: 1px solid var(--line); border-radius: 14px;
    padding: 26px 24px; text-decoration: none; display: grid; gap: 12px; align-content: start;
    position: relative; overflow: hidden;
}
.tool-card::after { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--lime); transform: scaleX(0); transform-origin: left; transition: transform 0.25s ease; }
.tool-card:hover::after { transform: scaleX(1); }
.tool-card:hover { border-color: var(--lime); }
.tool-card:hover h3 { color: var(--lime); }
.tool-card:nth-child(2)::after { background: var(--amber); }
.tool-card:nth-child(2):hover { border-color: var(--amber); }
.tool-card:nth-child(2):hover h3 { color: var(--amber); }
.tool-index { font-family: var(--mono); font-size: 0.75rem; color: var(--faint); }
.tool-card h3 { font-family: var(--serif); font-size: 1.45rem; font-weight: 600; }
.tool-card p { font-size: 0.94rem; color: var(--muted); }
.tool-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 6px; }
.kbd { font-family: var(--mono); font-size: 0.72rem; border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 6px; padding: 2px 9px; color: var(--muted); background: var(--bg); }
.pill { font-family: var(--mono); font-size: 0.72rem; border: 1px solid var(--line); border-radius: 999px; padding: 2px 11px; color: var(--muted); }
.tool-go { margin-left: auto; font-family: var(--mono); font-size: 0.82rem; color: var(--lime); }
.tool-card:nth-child(2) .tool-go { color: var(--amber); }

/* ---------- Contact ---------- */
.contact { background: var(--bg2); border-top: 1px solid var(--line-soft); }
.contact-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 48px; align-items: start; }
.contact-big { font-family: var(--serif); font-size: clamp(2rem, 4.5vw, 3rem); line-height: 1.08; letter-spacing: -0.015em; margin-bottom: 14px; }
.contact-big em { font-style: italic; color: var(--lime); }
.contact-mail { font-family: var(--mono); font-size: 1rem; color: var(--muted); margin-bottom: 20px; word-break: break-all; }
.copy-hint { font-family: var(--mono); font-size: 0.82rem; color: var(--lime); min-height: 1.5em; margin-top: 10px; }
.contact-rows { list-style: none; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.contact-rows li { display: flex; align-items: center; gap: 16px; padding: 15px 20px; }
.contact-rows li + li { border-top: 1px solid var(--line-soft); }
.contact-rows i { color: var(--lime); width: 20px; text-align: center; }
.contact-rows div { display: grid; gap: 1px; }
.contact-rows .k { font-family: var(--mono); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--faint); }

/* ---------- Footer ---------- */
footer { border-top: 1px solid var(--line); padding: 24px 0; background: var(--bg); }
.foot-inner { display: flex; flex-wrap: wrap; gap: 10px 24px; align-items: center; justify-content: space-between; font-family: var(--mono); font-size: 0.78rem; color: var(--faint); }
.foot-inner a { text-decoration: none; }
.foot-mid { flex: 1; text-align: center; }

/* ---------- Reveal ---------- */
.reveal { opacity: 0; transform: translateY(12px); transition: opacity 0.5s ease, transform 0.5s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ---------- Teaching subpages ---------- */
.markdown-body { font-family: var(--sans); max-width: 860px; margin: 48px auto 72px; padding: 0 32px; line-height: 1.7; color: var(--ink); }
.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4 { font-family: var(--serif); font-weight: 600; letter-spacing: -0.01em; line-height: 1.25; margin: 30px 0 12px; }
.markdown-body h1 { font-size: 2rem; padding-bottom: 12px; border-bottom: 3px solid var(--lime); }
.markdown-body h2 { font-size: 1.5rem; padding-bottom: 8px; border-bottom: 1px solid var(--line); }
.markdown-body h3 { font-size: 1.2rem; color: var(--lime); }
.markdown-body p { margin-bottom: 14px; }
.markdown-body ul, .markdown-body ol { margin: 0 0 16px 4px; padding-left: 24px; }
.markdown-body li { margin-bottom: 6px; }
.markdown-body code { font-size: 0.9em; background: var(--surface2); border: 1px solid var(--line); border-radius: 6px; padding: 1px 6px; }
.markdown-body pre { background: var(--surface2); border: 1px solid var(--line); border-radius: 10px; padding: 18px 20px; overflow-x: auto; margin-bottom: 18px; }
.markdown-body pre code { background: none; border: none; padding: 0; }
.markdown-body img { border-radius: 10px; border: 1px solid var(--line); }
.markdown-body table { display: block; width: 100%; overflow-x: auto; border-collapse: collapse; margin: 0 0 20px; font-size: 0.93rem; border: 1px solid var(--line); border-radius: 10px; }
.markdown-body th, .markdown-body td { border-bottom: 1px solid var(--line-soft); padding: 9px 14px; text-align: left; vertical-align: top; }
.markdown-body thead th { background: var(--surface2); border-bottom: 1px solid var(--line); font-family: var(--mono); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.08em; white-space: nowrap; }
.markdown-body tbody tr:last-child th, .markdown-body tbody tr:last-child td { border-bottom: none; }
.markdown-body tbody tr:nth-child(even) { background: var(--surface); }

/* ---------- Responsive ---------- */
@media (max-width: 947px) {
    section.section { padding: 64px 0; }
    .menu-btn { display: inline-block; }
    .nav-clock { display: none; }
    .navbar nav .menu {
        position: fixed; top: var(--nav-h); left: 0; width: 100%;
        flex-direction: column; align-items: stretch; gap: 0;
        background: var(--surface); border-bottom: 1px solid var(--line);
        padding: 8px 16px 16px; display: none;
    }
    .navbar nav .menu.active { display: flex; }
    .menu-link { padding: 13px 12px; font-size: 0.95rem; }
    .hero-grid, .about-grid, .contact-grid { grid-template-columns: 1fr; }
    .hero-right { max-width: 420px; }
    .tool-grid { grid-template-columns: 1fr; }
    .t-year { grid-template-columns: 86px 1fr; gap: 16px; }
}

@media (max-width: 640px) {
    body { font-size: 16px; }
    .max-width { padding: 0 20px; }
    .hero { padding-top: calc(var(--nav-h) + 36px); }
    .hero-actions .btn { width: 100%; justify-content: center; }
    .hero-stats { flex-direction: column; }
    .hero-stats div + div { border-left: none; border-top: 1px solid var(--line); }
    .pub { grid-template-columns: 1fr 40px; }
    .pub-year { display: none; }
    .pub[data-year]::before { content: attr(data-year); font-family: var(--mono); font-size: 0.72rem; color: var(--lime); grid-column: 1 / -1; }
    .scroll-up-btn { right: 15px; }
    .foot-mid { display: none; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
    .reveal { opacity: 1; transform: none; }
    .caret, .pulse { animation: none; }
    .ticker-track { animation: none; }
    #graph-canvas { display: none; }
}