/* ── Reset & Variables ─────────────────────────────────── */

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

:root {
    --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
    --font-serif: 'Source Serif 4', 'Georgia', serif;

    --color-bg: #f5f0e8;
    --color-card: #faf6ee;
    --color-text: #3b2f2f;
    --color-heading: #2a1f1f;
    --color-accent: #8b6914;
    --color-accent-hover: #6e5210;
    --color-border: #d4c9b5;
    --color-muted: #6b5c4c;

    --container-max: 820px;
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2.5rem;
    --space-2xl: 4rem;

    --radius: 6px;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 72px;
}

body {
    font-family: var(--font-serif);
    font-size: 16px;
    line-height: 1.65;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.15s;
}

a:hover {
    color: var(--color-accent-hover);
}

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

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}


/* ── Navigation ───────────────────────────────────────── */

.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(245, 240, 232, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
}

.nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}

.nav-name {
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 1rem;
    color: var(--color-heading);
    letter-spacing: -0.02em;
}

.nav-name:hover {
    color: var(--color-accent);
}

.nav-links {
    display: flex;
    gap: var(--space-lg);
}

.nav-links a {
    font-family: var(--font-mono);
    color: var(--color-muted);
    font-size: 0.82rem;
    font-weight: 500;
    transition: color 0.15s;
}

.nav-links a:hover {
    color: var(--color-heading);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--color-heading);
    border-radius: 2px;
    transition: transform 0.2s, opacity 0.2s;
}


/* ── Hero / About ─────────────────────────────────────── */

.hero {
    padding: var(--space-2xl) 0;
    border-bottom: 1px solid var(--color-border);
}

.hero-grid {
    display: grid;
    grid-template-columns: 160px 1fr;
    gap: var(--space-xl);
    align-items: start;
}

.hero-photo {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    overflow: hidden;
    background: var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-muted);
    font-family: var(--font-mono);
    font-size: 0.8rem;
}

.hero-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero h1 {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-heading);
    line-height: 1.2;
    margin-bottom: var(--space-xs);
    letter-spacing: -0.03em;
}

.hero .subtitle {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    color: var(--color-muted);
    margin-bottom: var(--space-xs);
}

.hero .affiliation {
    font-size: 0.9rem;
    color: var(--color-muted);
    margin-bottom: var(--space-md);
}

.hero .bio {
    font-size: 1.02rem;
    line-height: 1.7;
    max-width: 520px;
    margin-bottom: var(--space-lg);
}

.hero .bio a {
    text-decoration: underline;
    text-underline-offset: 2px;
}

.hero-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.link-pill {
    display: inline-block;
    padding: 5px 14px;
    border: 1px solid var(--color-border);
    border-radius: 100px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-text);
    transition: border-color 0.15s, background 0.15s;
}

.link-pill:hover {
    border-color: var(--color-accent);
    background: var(--color-card);
    color: var(--color-accent);
}


/* ── Sections ─────────────────────────────────────────── */

section {
    padding: var(--space-2xl) 0;
    border-bottom: 1px solid var(--color-border);
}

section:last-of-type {
    border-bottom: none;
}

h2 {
    font-family: var(--font-mono);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-heading);
    margin-bottom: var(--space-xl);
    letter-spacing: -0.02em;
}


/* ── News ─────────────────────────────────────────────── */

.news-list {
    list-style: none;
}

.news-list li {
    display: flex;
    gap: var(--space-lg);
    padding: 10px 0;
    font-size: 0.95rem;
    line-height: 1.5;
}

.news-list li + li {
    border-top: 1px solid rgba(212, 201, 181, 0.5);
}

.news-list time {
    flex-shrink: 0;
    width: 85px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-accent);
    padding-top: 2px;
}


/* ── Publications ─────────────────────────────────────── */

.pub-filters {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
}

.filter-btn {
    padding: 5px 14px;
    border: 1px solid var(--color-border);
    border-radius: 100px;
    background: transparent;
    color: var(--color-muted);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
}

.filter-btn:hover {
    border-color: var(--color-heading);
    color: var(--color-heading);
}

.filter-btn.active {
    background: var(--color-heading);
    color: var(--color-bg);
    border-color: var(--color-heading);
}

.pub-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.pub-item {
    display: flex;
    gap: var(--space-lg);
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-top: 4px solid var(--color-accent);
    border-radius: var(--radius);
    padding: var(--space-lg);
    transition: box-shadow 0.2s;
}

.pub-item:hover {
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.pub-item.hidden {
    display: none;
}

.pub-thumb {
    flex-shrink: 0;
    width: 120px;
    height: 80px;
    background: var(--color-border);
    border-radius: 4px;
    overflow: hidden;
}

.pub-thumb img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.pub-details {
    flex: 1;
    min-width: 0;
}

.pub-title {
    font-family: var(--font-mono);
    font-size: 0.98rem;
    font-weight: 600;
    color: var(--color-heading);
    line-height: 1.4;
    margin-bottom: var(--space-xs);
}

.pub-authors {
    font-size: 0.88rem;
    color: var(--color-muted);
    margin-bottom: 2px;
}

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

.pub-venue {
    font-size: 0.85rem;
    color: var(--color-muted);
    font-style: italic;
    margin-bottom: var(--space-sm);
}

.pub-links {
    display: flex;
    gap: var(--space-md);
}

.pub-links a {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 600;
}

.pub-abstract-toggle {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--color-accent);
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    transition: color 0.15s;
}

.pub-abstract-toggle:hover {
    color: var(--color-accent-hover);
}

.pub-abstract {
    display: none;
    margin-top: var(--space-sm);
    padding: var(--space-md);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.88rem;
    line-height: 1.6;
    color: var(--color-muted);
}

.pub-abstract.open {
    display: block;
}

.pub-bibtex-toggle {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--color-accent);
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    transition: color 0.15s;
}

.pub-bibtex-toggle:hover {
    color: var(--color-accent-hover);
}

.pub-bibtex {
    display: none;
    margin-top: var(--space-sm);
}

.pub-bibtex.open {
    display: block;
}

.pub-bibtex pre {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    line-height: 1.5;
    color: var(--color-text);
    overflow-x: auto;
    white-space: pre;
}


/* ── Projects ─────────────────────────────────────────── */

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--space-lg);
}

.project-card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-top: 4px solid var(--color-accent);
    border-radius: var(--radius);
    overflow: hidden;
    transition: box-shadow 0.2s, transform 0.2s;
}

.project-card:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    transform: translateY(-2px);
}

.project-img {
    height: 140px;
    background: var(--color-border);
    overflow: hidden;
}

.project-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.project-body {
    padding: var(--space-lg);
}

.project-body h3 {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-heading);
    margin-bottom: var(--space-sm);
}

.project-body p {
    font-size: 0.9rem;
    color: var(--color-muted);
    line-height: 1.55;
    margin-bottom: var(--space-md);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.project-tags span {
    padding: 2px 10px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    color: var(--color-muted);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 500;
    border-radius: 100px;
}

.project-links {
    display: flex;
    gap: var(--space-md);
}

.project-links a,
.project-detail-link {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 600;
}

.project-detail-link {
    color: var(--color-accent);
    cursor: pointer;
}


/* ── Writings ─────────────────────────────────────────── */

.writing-list {
    list-style: none;
}

.writing-item {
    display: flex;
    gap: var(--space-lg);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius);
    color: var(--color-text);
    transition: background 0.15s;
}

.writing-item:hover {
    background: var(--color-card);
    color: var(--color-text);
}

.writing-item time {
    flex-shrink: 0;
    width: 85px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-muted);
    padding-top: 3px;
}

.writing-item h3 {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-heading);
    margin-bottom: var(--space-xs);
}

.writing-item p {
    font-size: 0.9rem;
    color: var(--color-muted);
    line-height: 1.5;
}


/* ── Footer ───────────────────────────────────────────── */

.footer {
    padding: var(--space-xl) 0;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-muted);
    border-top: 1px solid var(--color-border);
}


/* ── Blog Post Page ───────────────────────────────────── */

.post-header {
    padding: var(--space-2xl) 0 var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.post-back {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    display: inline-block;
    margin-bottom: var(--space-lg);
}

.post-header h1 {
    font-family: var(--font-mono);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-heading);
    line-height: 1.3;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-sm);
}

.post-meta {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--color-muted);
}

.project-header-grid {
    display: flex;
    align-items: start;
    justify-content: space-between;
    gap: var(--space-xl);
}

.project-hero-img {
    flex-shrink: 0;
    max-width: 180px;
}

.project-hero-img img {
    width: 100%;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
}

@media (max-width: 640px) {
    .project-header-grid {
        flex-direction: column;
    }
}

.post-content {
    padding: var(--space-xl) 0 var(--space-2xl);
}

.post-content h2 {
    font-size: 1.2rem;
    margin-top: var(--space-xl);
    margin-bottom: var(--space-md);
}

.post-content p {
    margin-bottom: var(--space-md);
    line-height: 1.75;
}

.post-content code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    background: var(--color-card);
    border: 1px solid var(--color-border);
    padding: 2px 6px;
    border-radius: 3px;
}

.post-content pre {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--space-lg);
    overflow-x: auto;
    margin-bottom: var(--space-md);
}

.post-content pre code {
    background: none;
    border: none;
    padding: 0;
}

.post-content blockquote {
    border-left: 3px solid var(--color-accent);
    padding-left: var(--space-lg);
    color: var(--color-muted);
    margin-bottom: var(--space-md);
}


/* ── Project Parts (detail page) ──────────────────────── */

.project-parts {
    padding: var(--space-xl) 0 var(--space-2xl);
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.part-card {
    display: flex;
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-top: 4px solid var(--color-accent);
    border-radius: var(--radius);
    overflow: hidden;
}

.part-number {
    flex-shrink: 0;
    width: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--color-accent);
    background: rgba(139, 105, 20, 0.06);
    border-right: 1px solid var(--color-border);
}

.part-body {
    flex: 1;
    padding: var(--space-lg);
}

.part-body h2 {
    font-size: 1.05rem;
    margin-bottom: var(--space-sm);
}

.part-body p {
    font-size: 0.92rem;
    color: var(--color-muted);
    line-height: 1.6;
    margin-bottom: var(--space-md);
}

.part-links {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.part-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text);
    transition: border-color 0.15s, background 0.15s;
}

.part-link:hover {
    border-color: var(--color-accent);
    background: rgba(139, 105, 20, 0.06);
    color: var(--color-accent);
}

.part-link-icon {
    font-size: 0.75rem;
    opacity: 0.7;
}

@media (max-width: 640px) {
    .part-card {
        flex-direction: column;
    }

    .part-number {
        width: auto;
        padding: var(--space-sm) var(--space-lg);
        border-right: none;
        border-bottom: 1px solid var(--color-border);
        justify-content: flex-start;
    }
}


/* ── Responsive ───────────────────────────────────────── */

@media (max-width: 640px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(245, 240, 232, 0.97);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        padding: var(--space-md) var(--space-lg) var(--space-lg);
        gap: var(--space-md);
        border-bottom: 1px solid var(--color-border);
    }

    .nav-links.open {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-grid {
        grid-template-columns: 1fr;
        justify-items: center;
        text-align: center;
    }

    .hero .bio {
        text-align: left;
    }

    .hero-links {
        justify-content: center;
    }

    .pub-item {
        flex-direction: column;
    }

    .pub-thumb {
        width: 100%;
        height: 140px;
    }

    .news-list li {
        flex-direction: column;
        gap: var(--space-xs);
    }

    .news-list time {
        width: auto;
    }

    .writing-item {
        flex-direction: column;
        gap: var(--space-xs);
        padding: var(--space-md);
    }

    .writing-item time {
        width: auto;
    }

    .pub-filters {
        flex-wrap: wrap;
    }
}