/* ==========================================================================
   Academic site — "Ink & Paper" theme
   A print-journal-inspired palette: warm paper, ink text, deep bottle-green
   accent, and a brass rule reserved for citations and emphasis. Hairline
   rules and hard-edged offsets stand in for shadows and rounded cards.
   ========================================================================== */

/* Reset and Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Color — university blue and white */
    --color-text: #182635;
    --color-text-light: #4c5a6b;
    --color-text-muted: #5f6b7a;
    --color-link: #1d4e89;
    --color-link-hover: #123a6a;
    --color-background: #ffffff;
    --color-background-alt: #eef2f8;
    --color-white: #ffffff;
    --color-border: #d7e0eb;
    --color-accent: #1d4e89;
    --color-accent-soft: #3f7cc4;

    /* Type */
    --font-serif: 'Source Serif 4', Georgia, serif;
    --font-sans: 'Source Sans 3', sans-serif;
    --font-body: 'Inter', 'Helvetica Neue', Arial, sans-serif;

    --max-width: 1080px;
    --spacing-unit: 1rem;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    *, *::before, *::after {
        animation-duration: 0.001ms !important;
        transition-duration: 0.001ms !important;
    }
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.65;
    color: var(--color-text);
    background-color: var(--color-background);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--color-link);
}

:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
}

/* Container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 calc(var(--spacing-unit) * 2);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header & Navigation */
header {
    padding: calc(var(--spacing-unit) * 1.75) 0;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: calc(var(--spacing-unit) * 2.5);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-unit);
}

.nav-name {
    font-family: var(--font-serif);
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
    letter-spacing: 0;
    position: relative;
    padding-left: calc(var(--spacing-unit) * 0);
}

/* A small bordered mark, like a colophon, in place of a logo */
/* .nav-name::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 8rem;
    height: 4rem;
    background-image: url("logo_full.png");
    background-size: cover;
    background-position: center;
} */

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

.nav-links {
    list-style: none;
    display: flex;
    gap: calc(var(--spacing-unit) * 2);
}

.nav-links a {
    font-size: 0.92rem;
    color: var(--color-text-light);
    text-decoration: none;
    padding-bottom: 3px;
    border-bottom: 1px solid transparent;
    transition: color 0.15s ease, border-color 0.15s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-text);
    border-bottom-color: var(--color-accent);
}

/* Main Content */
main {
    flex: 1;
}

/* Hero Banner — a quiet paper band framed by hairline rules, no gradient */
.hero-banner {
    background: var(--color-background-alt);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    margin-left: calc(-50vw + 50%);
    margin-right: calc(-50vw + 50%);
    padding: calc(var(--spacing-unit) * 2.5) calc(var(--spacing-unit) * 2);
    margin-bottom: calc(var(--spacing-unit) * 3);
}

/* Home Page - Profile Section (30/70 split, framed photo) */
.profile-section {
    display: grid;
    grid-template-columns: 30% 70%;
    gap: calc(var(--spacing-unit) * 3.5);
    align-items: start;
    max-width: var(--max-width);
    margin: 0 auto;
}

.profile-photo {
    border: 0.5px solid var(--color-text);
    border-radius: 14px;
    overflow: hidden;
}

.profile-photo img {
    width: 100%;
    height: auto;
    display: block;
    filter: grayscale(15%);
}

.profile-text h1 {
    font-family: var(--font-serif);
    font-size: 2.35rem;
    font-weight: 600;
    margin-bottom: calc(var(--spacing-unit) * 1.25);
    color: var(--color-text);
    letter-spacing: -0.01em;
    line-height: 1.15;
}

.profile-text p {
    margin-bottom: calc(var(--spacing-unit) * 0.85);
    font-size: 1.05rem;
    max-width: 62ch;
    color: var(--color-text);
    text-align: justify;
    text-justify: inter-word;
    -webkit-hyphens: auto;
    hyphens: auto;
    font-family: var(--font-body);
}

.profile-text a {
    color: var(--color-link);
    text-decoration: none;
    border-bottom: 1px solid var(--color-border);
    transition: border-color 0.15s ease;
}

.profile-text a:hover {
    border-bottom-color: var(--color-link);
}

/* Contact Info */
.contact-info {
    display: grid;
    grid-template-columns: auto 1fr;
    column-gap: calc(var(--spacing-unit) * 5);
    row-gap: calc(var(--spacing-unit) * 0.25);
    align-self: center;
    margin-left: calc(var(--spacing-unit) * 2);
    margin-top: calc(var(--spacing-unit) * 0);
    padding-top: calc(var(--spacing-unit) * 0);
}

.contact-info h2 {
    grid-column: 1;
    grid-row: 1 / span 2;
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 0;
    color: var(--color-text);
}

/* .contact-info p {
    grid-column: 2;
    font-size: 1.35rem;
    margin-bottom: calc(var(--spacing-unit) * 0.5);
    color: var(--color-text-light);
    font-family: var(--font-sans);
} */

.contact-info p {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    font-size: 1.3rem;
    margin-bottom: calc(var(--spacing-unit) * 0.5);
    color: var(--color-text-light);
    font-family: var(--font-sans);
}

.contact-info p i {
    width: 1.5rem;
    text-align: center;
    margin-top: 0.2rem;
    margin-right: 0.57rem;
    flex-shrink: 0;
    color: var(--color-accent);
    font-size: 1.3rem;
}

/* Social Links — square marks rather than circular icon buttons */
.social-links {
    margin-top: calc(var(--spacing-unit) * 1.5);
    display: flex;
    gap: calc(var(--spacing-unit) * 0.6);
    flex-wrap: wrap;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    font-size: 1.1rem;
    color: var(--color-text-light);
    text-decoration: none;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
    background: var(--color-white);
}

.social-links a:hover {
    background-color: var(--color-accent);
    color: var(--color-white);
    border-color: var(--color-accent);
}

/* News Section */
.news-section {
    padding-top: calc(var(--spacing-unit) * 0.5);
}

.news-section h2 {
    font-family: var(--font-display);
    font-style: italic;
    font-size: 1.35rem;
    font-weight: 600;
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    color: var(--color-text);
}

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

.news-list li {
    display: grid;
    grid-template-columns: 110px 1fr;
    gap: var(--spacing-unit);
    padding: calc(var(--spacing-unit) * 0.85) 0;
    border-bottom: 1px solid var(--color-border);
}

.news-list li:last-child {
    border-bottom: none;
}

.news-date {
    font-size: 0.88rem;
    color: var(--color-accent-soft);
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

.news-item {
    font-size: 0.95rem;
    color: var(--color-text);
}

/* Research Page */
.page-title {
    font-family: var(--font-serif);
    font-size: 2.1rem;
    font-weight: 600;
    margin-bottom: calc(var(--spacing-unit) * 2);
    color: var(--color-text);
    letter-spacing: -0.01em;
}

.research-section {
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.research-section h2 {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    color: var(--color-text);
    padding-bottom: calc(var(--spacing-unit) * 0.4);
    border-bottom: 2px solid var(--color-accent);
    display: inline-block;
}

/* Papers styled as citation-like entries with a hanging indent */
.paper {
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    padding-bottom: calc(var(--spacing-unit) * 1.5);
}

.paper-title {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: calc(var(--spacing-unit) * 0.3);
    line-height: 1.4;
}

.paper-authors {
    font-size: 0.95rem;
    color: var(--color-text-light);
    margin-bottom: calc(var(--spacing-unit) * 0.5);
}

.paper-prevtitle {
    font-size: 0.82rem;
    color: var(--color-text-light);
    margin-bottom: calc(var(--spacing-unit) * 0.5);
}

.paper-status {
    font-size: 0.82rem;
    color: var(--color-accent-soft);
    font-weight: 600;
    margin-bottom: calc(var(--spacing-unit) * 0.5);
}

.paper-abstract {
    font-size: 0.95rem;
    color: var(--color-text);
    line-height: 1.5;
    text-align: justify;
    text-justify: inter-word;
    -webkit-hyphens: auto;
    hyphens: auto;
}

.paper-abstract summary {
    cursor: pointer;
    color: var(--color-link);
    font-weight: 500;
    margin-bottom: calc(var(--spacing-unit) * 0.5);
}

.paper-abstract summary:hover {
    text-decoration: underline;
}

.paper-abstract p {
    font-family: var(--font-body);
    margin-top: calc(var(--spacing-unit) * 0.75);
}

.paper-links {
    margin-top: calc(var(--spacing-unit) * 0.75);
    display: flex;
    gap: calc(var(--spacing-unit) * 0.75);
    flex-wrap: wrap;
}

.paper-link-btn {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    font-size: 0.85rem;
    color: var(--color-accent);
    text-decoration: none;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    background-color: var(--color-white);
    transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.paper-link-btn:hover {
    background-color: var(--color-accent);
    color: var(--color-white);
    border-color: var(--color-accent);
}

/* Teaching Page */
.teaching-section {
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.teaching-section h2 {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    color: var(--color-text);
    padding-bottom: calc(var(--spacing-unit) * 0.4);
    border-bottom: 2px solid var(--color-accent);
    display: inline-block;
}

.course {
    margin-bottom: calc(var(--spacing-unit) * 2.25);
    padding-bottom: calc(var(--spacing-unit) * 2);
}

.course-title {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: calc(var(--spacing-unit) * 0.3);
    line-height: 1.4;
}


/* CV Page */
.cv-section {
    text-align: center;
    padding: calc(var(--spacing-unit) * 4) 0;
}

.cv-section p {
    margin-bottom: calc(var(--spacing-unit) * 2);
    font-size: 1.05rem;
    color: var(--color-text-light);
}

.cv-download {
    display: inline-block;
    padding: 0.75rem 1.9rem;
    background-color: var(--color-accent);
    color: var(--color-white);
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: background-color 0.15s ease;
}

.cv-download:hover {
    background-color: var(--color-link-hover);
}

.cv-embed {
    margin-top: calc(var(--spacing-unit) * 3);
    border: 1px solid var(--color-border);
    overflow: hidden;
}

.cv-embed iframe {
    width: 100%;
    height: 800px;
    border: none;
}

/* Footer */
footer {
    margin-top: auto;
    padding: calc(var(--spacing-unit) * 2) 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

footer p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* Responsive Design */
@media (max-width: 900px) {
    .hero-banner {
        padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 2);
    }

    .profile-section {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .profile-photo {
        max-width: 320px;
        margin: 0 auto calc(var(--spacing-unit) * 2);
    }

    .profile-text p {
        max-width: none;
    }

    .contact-info {
        text-align: center;
    }

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

    .paper {
        padding-left: var(--spacing-unit);
    }
}

/* Embedded PDFs are unreliable on phones and tablets; the button remains. */
@media (max-width: 700px) {
    .cv-embed {
        display: none;
    }
}

@media (max-width: 600px) {
    .profile-photo {
        max-width: 280px;
    }

    .profile-text h1 {
        font-size: 1.8rem;
    }

    /* Justified text on narrow columns creates uneven gaps */
    .profile-text p,
    .paper-abstract {
        text-align: left;
    }

    nav {
        flex-direction: column;
        text-align: center;
    }

    .nav-links {
        gap: var(--spacing-unit);
    }

    /* Contact block: single column so it isn't cramped on phones */
    .contact-info {
        grid-template-columns: 1fr;
        margin-left: 0;
        text-align: left;
    }

    .contact-info h2 {
        grid-row: auto;
        font-size: 1.6rem;
        margin-bottom: calc(var(--spacing-unit) * 0.5);
    }

    .contact-info p {
        font-size: 1.05rem;
    }

    .contact-info p i {
        font-size: 1.05rem;
        margin-right: 0;
    }
}

@media (max-width: 500px) {
    :root {
        --spacing-unit: 0.875rem;
    }

    html {
        font-size: 15px;
    }

    .container {
        padding: 0 var(--spacing-unit);
    }

    /* Side margins only, so the bottom margin from .hero-banner is kept */
    .hero-banner {
        margin-left: calc(var(--spacing-unit) * -1);
        margin-right: calc(var(--spacing-unit) * -1);
        padding: calc(var(--spacing-unit) * 2) var(--spacing-unit);
    }
}