:root {
    --bg: #f5f1e8;
    --bg-muted: #ebe4d7;
    --surface: rgba(255, 252, 246, 0.84);
    --surface-strong: #fbf7ef;
    --ink: #14213a;
    --muted: #5a6480;
    --line: rgba(20, 33, 58, 0.14);
    --accent: #b65a2a;
    --accent-strong: #8f3f17;
    --accent-soft: rgba(182, 90, 42, 0.12);
    --teal: #2a7471;
    --shadow: 0 22px 70px rgba(20, 33, 58, 0.12);
    --radius-lg: 28px;
    --radius-md: 18px;
    --radius-sm: 12px;
    --container: 1240px;
    --header-height: 88px;
    --transition: 220ms ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background:
        radial-gradient(circle at top left, rgba(182, 90, 42, 0.18), transparent 30%),
        radial-gradient(circle at right 20%, rgba(42, 116, 113, 0.16), transparent 24%),
        linear-gradient(180deg, #f7f2ea 0%, #f2ebdf 100%);
    color: var(--ink);
    font-family: "IBM Plex Sans", sans-serif;
    line-height: 1.65;
    min-height: 100vh;
}

body.menu-open {
    overflow: hidden;
}

a {
    color: inherit;
}

button,
input,
textarea,
select {
    font: inherit;
}

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

.page-noise {
    background-image:
        linear-gradient(rgba(20, 33, 58, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(20, 33, 58, 0.03) 1px, transparent 1px);
    background-position: center center;
    background-size: 72px 72px;
    inset: 0;
    opacity: 0.25;
    pointer-events: none;
    position: fixed;
    z-index: -1;
}

.container {
    margin: 0 auto;
    max-width: var(--container);
    padding: 0 24px;
    width: 100%;
}

.site-header {
    backdrop-filter: blur(18px);
    background: rgba(245, 241, 232, 0.82);
    border-bottom: 1px solid rgba(20, 33, 58, 0.08);
    left: 0;
    position: sticky;
    top: 0;
    z-index: 50;
}

.site-nav {
    align-items: center;
    display: flex;
    gap: 24px;
    justify-content: space-between;
    min-height: var(--header-height);
    padding-bottom: 18px;
    padding-top: 18px;
}

.brand {
    align-items: center;
    display: inline-flex;
    gap: 14px;
    text-decoration: none;
}

.brand-mark {
    align-items: center;
    background: linear-gradient(145deg, var(--ink), #31456f);
    border-radius: 50%;
    color: #fdf8f2;
    display: inline-flex;
    font-family: "Fraunces", serif;
    font-size: 1rem;
    font-weight: 600;
    height: 46px;
    justify-content: center;
    letter-spacing: 0.08em;
    width: 46px;
}

.brand-text {
    display: grid;
    gap: 2px;
}

.brand-text strong {
    font-size: 1rem;
    letter-spacing: 0.02em;
}

.brand-subtitle {
    color: var(--muted);
    font-size: 0.76rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.nav-toggle {
    background: transparent;
    border: 0;
    cursor: pointer;
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 6px;
}

.nav-toggle span {
    background: var(--ink);
    border-radius: 999px;
    display: block;
    height: 2px;
    transition: transform var(--transition), opacity var(--transition);
    width: 24px;
}

.nav-panel {
    align-items: center;
    display: flex;
    gap: 24px;
}

.nav-links {
    align-items: center;
    display: flex;
    gap: 22px;
    list-style: none;
}

.nav-links a {
    color: var(--muted);
    font-size: 0.94rem;
    position: relative;
    text-decoration: none;
    transition: color var(--transition);
}

.nav-links a::after {
    background: var(--accent);
    bottom: -8px;
    content: "";
    height: 2px;
    left: 0;
    position: absolute;
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform var(--transition);
    width: 100%;
}

.nav-links a:hover,
.nav-links a:focus-visible {
    color: var(--ink);
}

.nav-links a:hover::after,
.nav-links a:focus-visible::after {
    transform: scaleX(1);
}

.language-switch {
    align-items: center;
    background: rgba(20, 33, 58, 0.05);
    border: 1px solid rgba(20, 33, 58, 0.08);
    border-radius: 999px;
    display: inline-flex;
    gap: 6px;
    padding: 5px;
}

.btn-language {
    background: transparent;
    border: 0;
    border-radius: 999px;
    color: var(--muted);
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    min-width: 52px;
    padding: 10px 14px;
    text-transform: uppercase;
    transition: background var(--transition), color var(--transition), transform var(--transition);
}

.btn-language:disabled {
    cursor: wait;
    opacity: 0.5;
}

.btn-language.active {
    background: var(--ink);
    color: #fdf8f2;
}

.btn-language:hover:not(:disabled),
.btn-language:focus-visible {
    transform: translateY(-1px);
}

.hero {
    overflow: clip;
    padding: 72px 0 48px;
    position: relative;
}

.hero::before {
    background:
        radial-gradient(circle at center, rgba(182, 90, 42, 0.16), transparent 42%),
        linear-gradient(135deg, rgba(20, 33, 58, 0.06), rgba(20, 33, 58, 0));
    border-radius: 38px;
    content: "";
    inset: 26px;
    position: absolute;
    z-index: -1;
}

.hero-grid {
    align-items: start;
    display: grid;
    gap: 36px;
    grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
}

.hero-copy {
    padding-top: 18px;
}

.eyebrow {
    color: var(--accent-strong);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.24em;
    margin-bottom: 16px;
    text-transform: uppercase;
}

.hero-title,
.section-title,
.panel-title,
.about-card-title {
    font-family: "Fraunces", serif;
    font-weight: 600;
    line-height: 0.98;
}

.hero-title {
    font-size: clamp(3.6rem, 7vw, 7rem);
    margin-bottom: 20px;
    max-width: 10ch;
}

html[lang="ja"] .hero-title {
    font-size: clamp(2rem, 6.8vw, 5.6rem);
    line-height: 1.05;
    max-width: none;
    white-space: nowrap;
    word-break: keep-all;
}

.hero-subtitle {
    color: var(--ink);
    font-size: clamp(1.1rem, 2vw, 1.55rem);
    font-weight: 600;
    margin-bottom: 18px;
    max-width: 32rem;
}

.hero-description,
.section-intro,
.about-text,
.panel-text {
    color: var(--muted);
    font-size: 1.04rem;
}

.hero-description {
    max-width: 40rem;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 34px;
}

.btn {
    align-items: center;
    border-radius: 999px;
    display: inline-flex;
    font-weight: 700;
    gap: 10px;
    padding: 14px 22px;
    text-decoration: none;
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.btn:hover,
.btn:focus-visible {
    transform: translateY(-2px);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), #c77644);
    box-shadow: 0 18px 34px rgba(182, 90, 42, 0.24);
    color: #fff8f2;
}

.btn-secondary {
    background: rgba(20, 33, 58, 0.08);
    border: 1px solid rgba(20, 33, 58, 0.1);
    color: var(--ink);
}

.hero-stats {
    display: grid;
    gap: 14px;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: 42px;
}

.stat-card,
.hero-panel,
.about-card,
.timeline-card,
.project-card,
.contact-card {
    background: var(--surface);
    border: 1px solid rgba(20, 33, 58, 0.08);
    box-shadow: var(--shadow);
}

.stat-card {
    border-radius: 22px;
    padding: 20px 18px;
}

.stat-value {
    font-family: "Fraunces", serif;
    font-size: 1.18rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.stat-label {
    color: var(--muted);
    font-size: 0.88rem;
}

.hero-panel {
    border-radius: 30px;
    padding: 24px;
    position: relative;
}

.hero-panel::before {
    background: linear-gradient(135deg, rgba(182, 90, 42, 0.2), rgba(42, 116, 113, 0.1));
    border-radius: inherit;
    content: "";
    inset: 0;
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask-composite: exclude;
    padding: 1px;
    pointer-events: none;
    position: absolute;
}

.profile-frame {
    aspect-ratio: 1;
    background: linear-gradient(145deg, rgba(20, 33, 58, 0.08), rgba(182, 90, 42, 0.1));
    border-radius: 26px;
    overflow: hidden;
}

.profile-frame img,
.profile-placeholder {
    height: 100%;
    object-fit: cover;
    width: 100%;
}

.profile-placeholder {
    align-items: center;
    color: var(--ink);
    display: flex;
    font-family: "Fraunces", serif;
    font-size: 4rem;
    justify-content: center;
}

.hero-panel-copy {
    margin-top: 24px;
}

.panel-label,
.legend-title {
    color: var(--accent-strong);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    margin-bottom: 10px;
    text-transform: uppercase;
}

.panel-title {
    font-size: 2rem;
    margin-bottom: 14px;
}

.hero-details {
    display: grid;
    gap: 14px;
    margin-top: 28px;
}

.hero-details div {
    border-top: 1px solid var(--line);
    padding-top: 14px;
}

.hero-details dt {
    color: var(--muted);
    font-size: 0.84rem;
    margin-bottom: 5px;
}

.hero-details dd {
    font-weight: 600;
}

.hero-orbit {
    border: 1px solid rgba(20, 33, 58, 0.08);
    border-radius: 50%;
    pointer-events: none;
    position: absolute;
}

.hero-orbit-left {
    height: 360px;
    left: -120px;
    top: 160px;
    width: 360px;
}

.hero-orbit-right {
    height: 520px;
    right: -180px;
    top: 50px;
    width: 520px;
}

.section {
    padding: 92px 0;
    position: relative;
    scroll-margin-top: 96px;
}

.section-muted {
    background: linear-gradient(180deg, rgba(255, 252, 246, 0.5), rgba(235, 228, 215, 0.68));
}

.section-header {
    margin-bottom: 32px;
}

.split-header {
    align-items: end;
    display: flex;
    gap: 24px;
    justify-content: space-between;
}

.section-title {
    font-size: clamp(2.4rem, 5vw, 4rem);
    max-width: 12ch;
}

.section-intro {
    max-width: 34rem;
}

.about-grid {
    display: grid;
    gap: 26px;
    grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
}

.about-copy {
    padding-right: 24px;
}

.about-text {
    font-size: 1.12rem;
    max-width: 48rem;
}

.about-card {
    align-self: start;
    border-radius: 28px;
    padding: 26px;
}

.about-card-title {
    font-size: 1.8rem;
    margin-bottom: 18px;
}

.about-points {
    display: grid;
    gap: 12px;
    list-style: none;
}

.about-points li {
    border-top: 1px solid var(--line);
    color: var(--muted);
    padding-top: 12px;
}

.timeline {
    display: grid;
    gap: 22px;
    margin-top: 24px;
    position: relative;
}

.timeline::before {
    background: linear-gradient(180deg, rgba(20, 33, 58, 0.16), rgba(182, 90, 42, 0.2));
    border-radius: 999px;
    content: "";
    left: 18px;
    position: absolute;
    top: 12px;
    bottom: 12px;
    width: 2px;
}

.timeline-item {
    opacity: 0;
    padding-left: 54px;
    position: relative;
    transform: translateY(24px);
    transition: opacity 500ms ease, transform 500ms ease;
}

.timeline-item.in-view {
    opacity: 1;
    transform: translateY(0);
}

.timeline-dot {
    background: linear-gradient(135deg, var(--ink), var(--accent));
    border: 5px solid #f7f2ea;
    border-radius: 50%;
    box-shadow: 0 0 0 5px rgba(182, 90, 42, 0.12);
    height: 18px;
    left: 10px;
    position: absolute;
    top: 28px;
    width: 18px;
}

.timeline-card {
    border-radius: 26px;
    padding: 24px;
}

.timeline-date {
    color: var(--accent-strong);
    font-size: 0.84rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    margin-bottom: 10px;
    text-transform: uppercase;
}

.timeline-role {
    font-family: "Fraunces", serif;
    font-size: 1.8rem;
    line-height: 1.08;
    margin-bottom: 8px;
}

.timeline-org {
    color: var(--muted);
    font-size: 1rem;
    margin-bottom: 16px;
}

.timeline-list,
.timeline-responsibilities ul {
    color: var(--muted);
    display: grid;
    gap: 10px;
    list-style-position: inside;
}

.timeline-responsibilities {
    border-top: 1px solid var(--line);
    margin-top: 18px;
    padding-top: 18px;
}

.timeline-responsibilities strong {
    display: block;
    margin-bottom: 10px;
}

.projects-grid {
    display: grid;
    gap: 34px;
    margin-top: 24px;
}

.projects-group {
    display: grid;
    gap: 18px;
}

.projects-group-head {
    display: grid;
    gap: 8px;
}

.projects-group-title {
    font-family: "Fraunces", serif;
    font-size: 2rem;
    line-height: 1.08;
}

.projects-group-description {
    color: var(--muted);
    max-width: 44rem;
}

.projects-group-grid {
    display: grid;
    gap: 22px;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.project-card {
    border-radius: 26px;
    display: flex;
    flex-direction: column;
    min-height: 100%;
    overflow: hidden;
    position: relative;
}

.project-card::before {
    background: linear-gradient(135deg, rgba(182, 90, 42, 0.9), rgba(42, 116, 113, 0.8));
    content: "";
    height: 6px;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
}

.project-card-head,
.project-card-body,
.project-card-foot {
    padding-left: 24px;
    padding-right: 24px;
}

.project-card-head {
    padding-top: 24px;
}

.project-card-body {
    flex: 1;
    padding-bottom: 18px;
    padding-top: 14px;
}

.project-card-foot {
    align-items: start;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: space-between;
    padding-bottom: 24px;
}

.project-index {
    color: var(--muted);
    font-size: 0.84rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.project-year {
    color: var(--accent-strong);
    font-size: 0.84rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.project-title {
    font-family: "Fraunces", serif;
    font-size: 1.6rem;
    line-height: 1.15;
}

.project-summary {
    color: var(--muted);
    font-size: 0.98rem;
}

.doi-link {
    color: var(--ink);
    font-weight: 700;
    text-decoration: none;
}

.project-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 14px;
    justify-content: flex-end;
}

.doi-link:hover,
.doi-link:focus-visible {
    color: var(--accent-strong);
}

.contact-card {
    align-items: center;
    border-radius: 28px;
    display: grid;
    gap: 32px;
    grid-template-columns: minmax(0, 1fr) minmax(320px, 0.95fr);
    padding: 28px;
}

.contact-title {
    font-size: clamp(2.15rem, 4.2vw, 3.5rem);
    max-width: 15ch;
}

.contact-intro {
    margin-top: 18px;
}

.contact-links {
    align-content: start;
    align-self: center;
    display: grid;
    gap: 12px;
}

.contact-feature,
.contact-tile {
    text-decoration: none;
}

.contact-feature {
    background:
        linear-gradient(135deg, rgba(182, 90, 42, 0.14), rgba(182, 90, 42, 0.04)),
        rgba(255, 252, 246, 0.7);
    border: 1px solid rgba(182, 90, 42, 0.18);
    border-radius: 20px;
    box-shadow: 0 14px 34px rgba(20, 33, 58, 0.07);
    display: grid;
    gap: 8px;
    padding: 18px 20px 16px;
    position: relative;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.contact-feature::after {
    background: linear-gradient(90deg, transparent, rgba(20, 33, 58, 0.12), transparent);
    content: "";
    height: 1px;
    left: 20px;
    position: absolute;
    right: 20px;
    top: 48px;
}

.contact-feature:hover,
.contact-feature:focus-visible,
.contact-tile:hover,
.contact-tile:focus-visible {
    border-color: rgba(182, 90, 42, 0.34);
    box-shadow: 0 18px 42px rgba(20, 33, 58, 0.1);
    transform: translateY(-2px);
}

.contact-feature-kicker,
.contact-tile-label {
    color: var(--accent-strong);
    font-size: 0.74rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.contact-feature-value {
    font-family: "Fraunces", serif;
    font-size: clamp(1.25rem, 2vw, 1.65rem);
    line-height: 1.02;
    margin-top: 8px;
    overflow-wrap: anywhere;
}

.contact-feature-hint {
    color: var(--muted);
    font-size: 0.96rem;
    max-width: 26rem;
}

.contact-secondary-grid {
    align-content: start;
    display: grid;
    gap: 10px;
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.contact-tile {
    background: rgba(255, 252, 246, 0.58);
    border: 1px solid rgba(20, 33, 58, 0.08);
    border-radius: 16px;
    box-shadow: 0 10px 24px rgba(20, 33, 58, 0.05);
    display: grid;
    gap: 8px;
    min-height: 82px;
    padding: 16px;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.contact-tile-value {
    align-self: end;
    color: var(--ink);
    font-family: "Fraunces", serif;
    font-size: 1.12rem;
    line-height: 1.1;
}

.site-footer {
    padding: 0 0 34px;
}

.site-footer .container {
    border-top: 1px solid var(--line);
    color: var(--muted);
    padding-top: 22px;
}

.loading-indicator {
    color: var(--muted);
    padding: 18px 0;
}

@media (max-width: 1080px) {
    .hero-grid,
    .about-grid,
    .contact-card,
    .split-header {
        grid-template-columns: 1fr;
    }

    .split-header {
        align-items: start;
        display: grid;
    }

}

@media (max-width: 820px) {
    .site-nav {
        align-items: center;
        min-height: 72px;
        padding-bottom: 12px;
        padding-top: 12px;
    }

    .brand {
        gap: 10px;
    }

    .brand-mark {
        font-size: 0.92rem;
        height: 40px;
        width: 40px;
    }

    .brand-text strong {
        font-size: 0.95rem;
    }

    .brand-subtitle {
        display: none;
    }

    .nav-toggle {
        display: inline-flex;
        margin-left: auto;
        margin-top: 0;
    }

    .nav-panel {
        background: rgba(255, 251, 244, 0.96);
        border: 1px solid rgba(20, 33, 58, 0.08);
        border-radius: 24px;
        box-shadow: var(--shadow);
        display: none;
        left: 24px;
        padding: 18px;
        position: absolute;
        right: 24px;
        top: calc(100% - 8px);
    }

    .nav-panel.is-open {
        display: grid;
        gap: 18px;
    }

    .nav-links {
        align-items: start;
        flex-direction: column;
        gap: 16px;
    }

    .hero {
        padding-top: 44px;
    }

    .hero-stats {
        grid-template-columns: 1fr;
    }

    .timeline-card {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .container {
        padding: 0 18px;
    }

    .hero::before {
        inset: 12px;
    }

    .section {
        padding: 72px 0;
    }

    .hero-title {
        font-size: clamp(2.8rem, 16vw, 4.2rem);
    }

    .section-title {
        font-size: clamp(2rem, 12vw, 3rem);
    }

    .hero-panel,
    .about-card,
    .timeline-card,
    .project-card,
    .contact-card {
        border-radius: 22px;
    }

    .contact-card {
        gap: 24px;
        padding: 22px 16px;
    }

    .contact-title {
        font-size: clamp(2rem, 9vw, 2.55rem);
        max-width: none;
    }

    .contact-intro {
        margin-top: 14px;
    }

    .timeline {
        gap: 18px;
    }

    .timeline::before {
        left: 12px;
    }

    .timeline-item {
        padding-left: 36px;
    }

    .timeline-dot {
        left: 3px;
    }

    .contact-secondary-grid {
        grid-template-columns: 1fr;
    }

    .contact-feature {
        border-radius: 18px;
        padding: 18px;
    }

    .contact-feature::after {
        left: 18px;
        right: 18px;
        top: 46px;
    }

    .contact-feature-value {
        font-family: "IBM Plex Sans", sans-serif;
        font-size: clamp(1.08rem, 5vw, 1.28rem);
        font-weight: 700;
        line-height: 1.18;
        margin-top: 8px;
    }

    .contact-tile {
        min-height: 76px;
        padding: 16px 18px;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation: none !important;
        transition: none !important;
    }
}