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

:root {
    /* Warm neutral palette */
    --bg-primary: #FAF8F5;
    --bg-sidebar: #F5F0E8;
    --bg-card: #FFFFFF;
    --text-primary: #2C2C2C;
    --text-secondary: #5A5A5A;
    --text-muted: #8A8A8A;
    --accent: #8B7355;
    --accent-hover: #6B5A45;
    --border: #E8E2D9;
    --shadow: rgba(0, 0, 0, 0.06);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Palatino Linotype', 'Book Antiqua', Palatino, serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 17px;
}

/* Layout */
.container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 300px;
    min-width: 300px;
    background-color: var(--bg-sidebar);
    padding: 3rem 2rem;
    position: fixed;
    height: 100vh;
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border);
}

.profile {
    text-align: center;
    margin-bottom: 2.5rem;
}

.profile-photo {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    background-color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px var(--shadow);
    overflow: hidden;
}

.profile-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center 20%;
}

.photo-placeholder {
    color: white;
    font-size: 2.5rem;
    font-weight: 600;
    letter-spacing: 2px;
}

.name {
    font-family: 'Palatino Linotype', 'Book Antiqua', Palatino, serif;
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.title {
    font-size: 1rem;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.affiliation {
    font-size: 0.9rem;
}

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

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

/* Contact Links */
.contact {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: auto;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s ease;
    font-size: 0.9rem;
}

.contact-item:hover {
    background-color: var(--bg-primary);
    color: var(--accent);
}

.contact-item .icon {
    width: 20px;
    text-align: center;
    font-weight: 600;
    font-size: 0.85rem;
}

/* Main Content */
.content {
    flex: 1;
    margin-left: 300px;
    padding: 3rem 4rem;
    max-width: 900px;
}

section {
    margin-bottom: 3rem;
}

h2 {
    font-family: 'Palatino Linotype', 'Book Antiqua', Palatino, serif;
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border);
}

h3.subsection {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: 1.5rem 0 1rem;
}

h3.subsection:first-of-type {
    margin-top: 0;
}

/* Experience & Education Entries */
.entry {
    margin-bottom: 1.25rem;
}

.entry-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.entry h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.entry .date {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.entry .role {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-top: 0.25rem;
}

/* Publications */
.publication {
    margin-bottom: 1.25rem;
}

.pub-title {
    font-size: 1rem;
    font-weight: 500;
    color: var(--accent);
    text-decoration: none;
    line-height: 1.4;
    display: inline-block;
    transition: color 0.2s ease;
}

.pub-title:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

.authors {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.venue {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-style: italic;
    margin-top: 0.15rem;
}

/* Sticky Header (About + Tabs) */
.sticky-header {
    position: sticky;
    top: 0;
    background-color: var(--bg-primary);
    z-index: 10;
    padding-top: 3rem;
    margin-top: -3rem;
}

/* About Section */
#about {
    margin-bottom: 1.5rem;
}

#about p {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

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

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

/* Tabs */
.tabs {
    display: flex;
    gap: 0;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--border);
    background-color: var(--bg-primary);
}

.tab {
    padding: 0.75rem 1.5rem;
    font-family: 'Palatino Linotype', 'Book Antiqua', Palatino, serif;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-muted);
    background: none;
    border: none;
    cursor: pointer;
    position: relative;
    transition: color 0.2s ease;
}

.tab:hover {
    color: var(--text-secondary);
}

.tab.active {
    color: var(--accent);
}

.tab.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--accent);
}

/* Panels */
.panel {
    display: none;
}

.panel.active {
    display: block;
}

/* Responsive Design */
@media (max-width: 900px) {
    .container {
        flex-direction: column;
    }

    .sidebar {
        position: relative;
        width: 100%;
        min-width: 100%;
        height: auto;
        padding: 2rem;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .content {
        margin-left: 0;
        padding: 2rem;
        max-width: 100%;
    }

    .sticky-header {
        padding-top: 2rem;
        margin-top: -2rem;
    }

    .contact {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        margin-top: 1.5rem;
    }

    .contact-item {
        padding: 0.5rem 1rem;
    }
}

@media (max-width: 500px) {
    .profile-photo {
        width: 100px;
        height: 100px;
    }

    .photo-placeholder {
        font-size: 1.8rem;
    }

    .name {
        font-size: 1.5rem;
    }

    .content {
        padding: 1.5rem;
    }

    .sticky-header {
        padding-top: 1.5rem;
        margin-top: -1.5rem;
    }

    .entry-header {
        flex-direction: column;
        gap: 0.25rem;
    }

    .entry .date {
        font-size: 0.8rem;
    }
}