@charset "utf-8";

/* ---------- Tokens ---------- */
:root {
    --bg: #ffffff;
    --surface: #f6f8fa;
    --text: #1f2328;
    --muted: #59636e;
    --border: #d8dee4;
    --accent: #0b5cad;
    --accent-bg: #eef4fb;
    --radius: 6px;
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 4rem;
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    font-size: 16px;
    line-height: 1.7;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

img,
video {
    max-width: 100%;
}

.container {
    max-width: 880px;
    margin: 0 auto;
    padding: 0 20px;
}

h1,
h2,
h3 {
    line-height: 1.3;
}

h2 {
    font-size: 1.5rem;
    margin: 0 0 1.25rem;
}

h3 {
    font-size: 1.1rem;
    margin: 2rem 0 0.75rem;
}

/* ---------- Navigation ---------- */
.site-nav {
    position: sticky;
    top: 0;
    z-index: 10;
    background: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid var(--border);
}

.site-nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    min-height: 3.25rem;
}

.brand {
    color: var(--text);
    font-weight: 700;
    white-space: nowrap;
}

.site-nav ul {
    display: flex;
    gap: 1.25rem;
    margin: 0;
    padding: 0;
    list-style: none;
    overflow-x: auto;
}

.site-nav ul a {
    color: var(--muted);
    font-size: 0.95rem;
    white-space: nowrap;
}

.site-nav ul a:hover {
    color: var(--text);
    text-decoration: none;
}

/* ---------- Sections ---------- */
section {
    padding: 2.5rem 0;
    border-top: 1px solid var(--border);
}

section.about {
    border-top: none;
}

/* ---------- About ---------- */
.about .container {
    display: flex;
    align-items: center;
    gap: 2.5rem;
    padding-top: 1rem;
}

.about-text {
    flex: 1;
}

.about h1 {
    font-size: 2rem;
    margin: 0;
}

.name-ja {
    margin: 0.25rem 0 1rem;
    color: var(--muted);
    font-size: 1.1rem;
}

.affiliation {
    margin: 0 0 1rem;
    font-weight: 600;
}

.about p {
    margin-top: 0;
}

.profile-links {
    margin: 1.25rem 0 0;
}

.portrait {
    flex-shrink: 0;
    width: 180px;
    height: 180px;
    border-radius: 50%;
    object-fit: cover;
}

/* ---------- Link chips ---------- */
.links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin: 0.35rem 0 0;
}

.links a {
    display: inline-block;
    padding: 0.05rem 0.55rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.8rem;
    line-height: 1.6;
}

.links a:hover {
    border-color: var(--accent);
    background: var(--accent-bg);
    text-decoration: none;
}

/* ---------- News ---------- */
.news {
    margin: 0;
    padding: 0;
    list-style: none;
}

.news li {
    display: grid;
    grid-template-columns: 5.5rem 1fr;
    gap: 1rem;
    padding: 0.3rem 0;
}

.news time {
    color: var(--muted);
    font-variant-numeric: tabular-nums;
}

/* ---------- Research ---------- */
.project {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 1.5rem;
    padding: 1.25rem 0;
    border-bottom: 1px solid var(--border);
}

.project:first-of-type {
    padding-top: 0;
}

.project:last-of-type {
    border-bottom: none;
}

.project video {
    display: block;
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    border-radius: var(--radius);
    background: var(--surface);
}

.project h3 {
    margin: 0 0 0.35rem;
    font-size: 1.05rem;
}

.cite {
    margin: 0;
    color: var(--muted);
    font-size: 0.92rem;
}

/* ---------- Publications ---------- */
.section-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem;
}

.section-head h2 {
    margin-bottom: 0.25rem;
}

.section-note {
    margin: 0 0 1rem;
    color: var(--muted);
    font-size: 0.9rem;
}

.toggle-all {
    padding: 0.15rem 0.7rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    color: var(--accent);
    font: inherit;
    font-size: 0.85rem;
    cursor: pointer;
}

.toggle-all:hover {
    border-color: var(--accent);
    background: var(--accent-bg);
}

.pub-group {
    border-top: 1px solid var(--border);
}

.pub-group:last-of-type {
    border-bottom: 1px solid var(--border);
}

.pub-group > summary {
    padding: 0.7rem 0;
    font-size: 1.05rem;
    font-weight: 700;
    cursor: pointer;
}

.pub-group > summary:hover {
    color: var(--accent);
}

.count {
    color: var(--muted);
    font-size: 0.9rem;
    font-weight: 400;
}

.pubs {
    margin: 0 0 1rem;
    padding-left: 2.25rem;
}

.pubs li {
    margin-bottom: 0.7rem;
    padding-left: 0.25rem;
    line-height: 1.55;
}

.pubs li::marker {
    color: var(--muted);
    font-size: 0.85rem;
    font-variant-numeric: tabular-nums;
}

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

.pub-meta {
    color: var(--muted);
    font-size: 0.9rem;
}

.pub-meta strong {
    color: var(--text);
}

.pubs .links {
    display: inline-flex;
    margin: 0 0 0 0.35rem;
    vertical-align: baseline;
}

/* ---------- CV ---------- */
.timeline {
    width: 100%;
    border-collapse: collapse;
}

.timeline th,
.timeline td {
    padding: 0.3rem 0;
    vertical-align: top;
    text-align: left;
}

.timeline th {
    width: 1%;
    padding-right: 1.5rem;
    color: var(--muted);
    font-weight: 400;
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
}

.plain {
    margin: 0;
    padding-left: 1.25rem;
}

.plain li {
    margin-bottom: 0.4rem;
}

/* ---------- Footer ---------- */
footer {
    padding: 1.5rem 0;
    border-top: 1px solid var(--border);
    color: var(--muted);
    font-size: 0.85rem;
    text-align: center;
}

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
    .site-nav .brand {
        display: none;
    }

    .about .container {
        flex-direction: column-reverse;
        align-items: flex-start;
        gap: 1.25rem;
    }

    .portrait {
        width: 128px;
        height: 128px;
    }

    .project {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .news li {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .timeline th,
    .timeline td {
        display: block;
        width: auto;
    }

    .timeline th {
        padding-bottom: 0;
    }

    .timeline td {
        padding-top: 0;
        padding-bottom: 0.6rem;
    }
}

/* ---------- Print ---------- */
@media print {
    .site-nav,
    .project video {
        display: none;
    }

    .project {
        grid-template-columns: 1fr;
    }

    section {
        padding: 1rem 0;
    }

    details > *:not(summary) {
        display: block;
    }
}