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

:root {
    --color-bg: #fafaf8;
    --color-text: #2c2c2c;
    --color-text-light: #5a5a5a;
    --color-accent: #3d5a80;
    --color-accent-hover: #2b4460;
    --color-border: #ddd;
    --color-header-bg: #ffffff;
    --color-footer-bg: #f0efed;
    --font-heading: 'Lora', Georgia, serif;
    --font-body: 'Source Sans 3', 'Segoe UI', sans-serif;
}

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

body {
    font-family: var(--font-body);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

/* ===== Header & Navigation ===== */
header {
    background: var(--color-header-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    max-width: 960px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
}

.site-title:hover {
    color: var(--color-accent);
    text-decoration: none;
}

nav {
    display: flex;
    gap: 0.25rem;
}

nav a {
    padding: 0.45rem 1rem;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 400;
    color: var(--color-text-light);
    text-decoration: none;
    transition: background 0.2s ease, color 0.2s ease;
}

nav a:hover {
    background: #eee;
    color: var(--color-text);
    text-decoration: none;
}

nav a.active {
    background: var(--color-accent);
    color: #fff;
    font-weight: 600;
}

/* ===== Main Content ===== */
main {
    flex: 1;
    max-width: 960px;
    margin: 0 auto;
    padding: 2.5rem 2rem;
    width: 100%;
}

/* ===== About Page Layout ===== */
.about-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 3rem;
    align-items: start;
}

.profile-sidebar {
    text-align: center;
}

.profile-photo img {
    width: 240px;
    height: 240px;
    object-fit: cover;
    border-radius: 50%;
    border: 4px solid var(--color-border);
    display: block;
    margin: 0 auto;
}

.profile-sidebar h1 {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 600;
    margin-top: 1.25rem;
    color: var(--color-text);
}

/* ===== Pill-style Profile Links ===== */
.profile-pills {
    margin-top: 1rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
}

.profile-pills a {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.85rem;
    border: 1.5px solid var(--color-border);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--color-text);
    text-decoration: none;
    transition: background 0.2s ease, border-color 0.2s ease;
}

.profile-pills a:hover {
    background: #eee;
    border-color: #bbb;
    text-decoration: none;
}

.profile-pills a i {
    font-size: 0.95rem;
    color: var(--color-text-light);
}

/* ===== Content Styles ===== */
.profile-content h2,
.page-content h2 {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    color: var(--color-text);
    border-bottom: 2px solid var(--color-border);
    padding-bottom: 0.35rem;
}

.profile-content h2:first-child,
.page-content h2:first-child {
    margin-top: 0;
}

.profile-content p,
.page-content p {
    margin-bottom: 1rem;
    color: var(--color-text);
}

.profile-content ul,
.page-content ul {
    margin-left: 1.25rem;
    margin-bottom: 1rem;
}

.profile-content li,
.page-content li {
    margin-bottom: 0.4rem;
}

/* ===== Research Page ===== */
.publication {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid #eee;
}

.publication:last-child {
    border-bottom: none;
}

.publication h3 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 0.3rem;
}

.publication .authors {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-bottom: 0.2rem;
}

.publication .venue {
    font-size: 0.9rem;
    font-style: italic;
    color: var(--color-text-light);
}

.publication .links {
    margin-top: 0.4rem;
    font-size: 0.85rem;
}

.publication .links a {
    margin-right: 1rem;
}

/* ===== Teaching Page ===== */
.teaching-item {
    margin-bottom: 1.75rem;
}

.teaching-item h3 {
    font-family: var(--font-heading);
    font-size: 1.05rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.teaching-item .role {
    font-size: 0.9rem;
    color: var(--color-accent);
    font-weight: 600;
}

.teaching-item .semester {
    font-size: 0.9rem;
    color: var(--color-text-light);
}

.teaching-item p {
    margin-top: 0.3rem;
    font-size: 0.95rem;
}

/* ===== Footer ===== */
footer {
    background: var(--color-footer-bg);
    border-top: 1px solid var(--color-border);
    text-align: center;
    padding: 1.25rem 2rem;
    font-size: 0.85rem;
    color: var(--color-text-light);
}

/* ===== Responsive ===== */
@media (max-width: 700px) {
    .header-inner {
        flex-direction: column;
        gap: 0.75rem;
    }

    nav {
        flex-wrap: wrap;
        justify-content: center;
    }

    .about-layout {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .profile-sidebar {
        text-align: center;
    }

    .profile-photo img {
        width: 200px;
        height: 200px;
    }

    main {
        padding: 1.5rem 1.25rem;
    }
}