/* Official UC Berkeley Brand Stylesheet (Open Berkeley Theme) */

:root {
    /* Brand Colors */
    --berkeley-blue: #003262;
    --california-gold: #FDB515;
    --founders-rock: #3B7EA1;
    --medalist: #C4820E;
    
    /* Neutral Colors */
    --bg-light: #ffffff;
    --bg-grey: #f9f9f9;
    --text-dark: #222222;
    --text-muted: #555555;
    --border-color: #d9d9d9;
    
    /* Fonts */
    --font-heading: 'Merriweather', Georgia, "Times New Roman", Times, serif;
    --font-body: 'Open Sans', "Helvetica Neue", Helvetica, Arial, sans-serif;
    
    --container-width: 1140px;
    --navbar-height: 46px;
    --transition-speed: 0.2s;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--navbar-height) + 20px);
    overflow-x: hidden;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--berkeley-blue);
    line-height: 1.25;
}

a {
    color: var(--berkeley-blue);
    text-decoration: none;
    transition: color var(--transition-speed);
}

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

/* --- UC Berkeley Brand Top Bar --- */
.berkeley-brand-bar {
    background-color: var(--berkeley-blue);
    color: #ffffff;
    height: 32px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    border-bottom: 4px solid var(--california-gold);
}

.brand-container {
    max-width: var(--container-width);
    width: 100%;
    margin: 0 auto;
    padding: 0 20px;
}

.brand-link {
    color: #ffffff;
    transition: opacity var(--transition-speed);
}

.brand-link:hover {
    opacity: 0.85;
    text-decoration: none;
}

/* --- Department Header --- */
.berkeley-header {
    background-color: #ffffff;
    padding: 24px 0;
}

.header-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.site-branding {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.site-title {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--berkeley-blue);
    font-family: var(--font-heading);
}

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

.site-subtitle {
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
}

/* --- Main Navigation --- */
.berkeley-nav {
    background-color: var(--berkeley-blue);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0,0,0,0.08);
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--navbar-height);
}

.nav-links {
    display: flex;
    height: 100%;
}

.nav-link {
    color: #ffffff;
    font-weight: 600;
    font-size: 0.9rem;
    padding: 0 20px;
    display: flex;
    align-items: center;
    height: 100%;
    transition: background-color var(--transition-speed);
}

.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    text-decoration: none;
    color: #ffffff;
}

.nav-link.active {
    background-color: #001c3d;
    box-shadow: inset 0 -3px 0 var(--california-gold);
}

.mobile-nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 20px;
    height: 14px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-nav-toggle .bar {
    width: 100%;
    height: 2px;
    background-color: #ffffff;
    transition: all 0.3s ease;
}

/* --- Layout Grid --- */
.main-layout {
    width: 100%;
    max-width: var(--container-width);
    margin: 40px auto 60px;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 50px;
    align-items: start;
}

/* --- Sidebar Profile (Left Column) --- */
.profile-sidebar {
    position: sticky;
    top: calc(var(--navbar-height) + 20px);
    min-width: 0;
}

.profile-card {
    background-color: #ffffff;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.profile-avatar-container {
    width: 100%;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.profile-avatar {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.profile-contact-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-header {
    font-size: 0.85rem;
    font-family: var(--font-body);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-dark);
    padding-bottom: 8px;
    border-bottom: 2px solid var(--berkeley-blue);
    margin-bottom: 8px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.contact-icon {
    font-size: 0.95rem;
    color: var(--founders-rock);
    margin-top: 3px;
    width: 16px;
    text-align: center;
}

.contact-detail {
    display: flex;
    flex-direction: column;
}

.contact-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.contact-value {
    font-size: 0.9rem;
    color: var(--text-dark);
    line-height: 1.4;
    word-break: break-all;
}

/* --- Content Area (Right Column) --- */
.content-area {
    display: flex;
    flex-direction: column;
    gap: 40px;
    min-width: 0;
}

/* Faculty Header Block */
.faculty-title-block {
    border-bottom: 4px solid var(--berkeley-blue);
    padding-bottom: 16px;
    margin-bottom: 10px;
}

.faculty-name {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--berkeley-blue);
    margin-bottom: 6px;
}

.faculty-title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-muted);
    font-family: var(--font-body);
}

/* Section Blocks */
.section-block {
    scroll-margin-top: calc(var(--navbar-height) + 20px);
}

.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--berkeley-blue);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
    margin-bottom: 20px;
}

.lead-text {
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--text-dark);
}

/* --- Experience Section (Employment & Education) --- */
.experience-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
}

.exp-tab-btn {
    background-color: var(--bg-grey);
    border: 1px solid var(--border-color);
    color: var(--berkeley-blue);
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 700;
    padding: 8px 16px;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.exp-tab-btn:hover {
    background-color: #eee;
}

.exp-tab-btn.active {
    background-color: var(--berkeley-blue);
    color: #ffffff;
    border-color: var(--berkeley-blue);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.experience-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.experience-list li {
    border-bottom: 1px dashed var(--border-color);
    padding-bottom: 16px;
}

.experience-list li:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.exp-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 4px;
    flex-wrap: wrap;
    gap: 10px;
}

.exp-role {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-dark);
}

.exp-date {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--founders-rock);
}

.exp-org {
    font-size: 0.95rem;
    color: var(--text-muted);
    font-weight: 400;
    font-family: var(--font-body);
}

/* --- Research Section Grid --- */
.research-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

.research-card {
    background-color: var(--bg-grey);
    border-left: 4px solid var(--berkeley-blue);
    padding: 20px;
    border-top: 1px solid #eaeaea;
    border-right: 1px solid #eaeaea;
    border-bottom: 1px solid #eaeaea;
}

.research-card .research-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.research-card .research-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* --- Mentorship Section --- */
.mentee-group-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-dark);
    margin: 24px 0 12px;
    padding-bottom: 4px;
    border-bottom: 1px solid var(--border-color);
}

.mentee-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding-left: 4px;
}

.mentee-list li {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.95rem;
}

.mentee-list li::before {
    content: "•";
    color: var(--berkeley-blue);
    font-weight: bold;
}

.mentee-details {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Alumni details style */
.alumni-item {
    display: flex;
    flex-direction: column;
    align-items: flex-start !important;
    gap: 4px !important;
    border-bottom: 1px dashed var(--border-color);
    padding-bottom: 12px;
}

.alumni-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.alumni-item::before {
    display: none !important;
}

.alumni-header {
    display: flex;
    align-items: center;
    gap: 8px;
}

.alumni-dest {
    font-size: 0.85rem;
    color: var(--text-dark);
    margin-left: 14px;
}

.alumni-award {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-dark);
    display: flex;
    align-items: center;
    gap: 6px;
    margin-left: 14px;
    margin-top: 4px;
}

.alumni-award i {
    color: var(--medalist);
}

/* --- Contact Section & Form --- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 30px;
}

.contact-info-block {
    font-size: 0.95rem;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-info-block p {
    line-height: 1.6;
}

.contact-info-block i {
    color: var(--founders-rock);
    margin-right: 6px;
}

.berkeley-form {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.form-group label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-muted);
}

.form-group input, .form-group textarea {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-grey);
    color: var(--text-dark);
    font-family: var(--font-body);
    font-size: 0.9rem;
    outline: none;
    transition: border-color var(--transition-speed);
}

.form-group input:focus, .form-group textarea:focus {
    border-color: var(--berkeley-blue);
    background-color: #ffffff;
}

.btn-berkeley {
    background-color: var(--berkeley-blue);
    color: #ffffff;
    font-family: var(--font-body);
    font-weight: 700;
    font-size: 0.85rem;
    padding: 10px 20px;
    border: 1px solid var(--berkeley-blue);
    cursor: pointer;
    transition: all var(--transition-speed);
    align-self: flex-start;
}

.btn-berkeley:hover {
    background-color: var(--california-gold);
    color: var(--berkeley-blue);
    border-color: var(--california-gold);
}

/* --- UC Berkeley Brand Footer --- */
.site-footer {
    background-color: var(--berkeley-blue);
    color: #ffffff;
    padding: 40px 20px;
    margin-top: 80px;
}

.footer-container {
    max-width: var(--container-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-brand {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.4rem;
}

.footer-berkeley-logo {
    color: #ffffff;
}

.footer-berkeley-logo:hover {
    text-decoration: none;
    opacity: 0.85;
}

.footer-info {
    text-align: right;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.5;
}

.footer-subtext {
    font-weight: 600;
    color: #ffffff;
}

/* --- Responsive Media Queries --- */
@media (max-width: 992px) {
    .main-layout {
        grid-template-columns: 1fr;
        gap: 30px;
        margin-top: 30px;
    }
    
    .profile-sidebar {
        position: static;
        width: 100%;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-info {
        text-align: left;
    }
}

@media (max-width: 768px) {
    .site-title {
        font-size: 1.8rem;
    }
    
    .mobile-nav-toggle {
        display: flex;
    }
    
    .nav-links {
        position: absolute;
        top: var(--navbar-height);
        left: 0;
        width: 100%;
        background-color: var(--berkeley-blue);
        flex-direction: column;
        height: auto;
        display: none;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-link {
        padding: 12px 20px;
        width: 100%;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .nav-link.active {
        background-color: #001c3d;
        box-shadow: inset 3px 0 0 var(--california-gold);
    }

/* Group Photo Styling */
.group-photo-container {
    width: 100%;
    margin-bottom: 24px;
    border: 1px solid var(--border-color);
    padding: 6px;
    background-color: var(--bg-grey);
}

.group-photo {
    width: 100%;
    height: auto;
    display: block;
}

/* --- Publications List --- */
.publications-list {
    list-style: decimal;
    padding-left: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.publications-list li {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-dark);
}

.pub-authors {
    font-weight: 600;
}

.pub-title {
    font-style: italic;
}

.pub-journal {
    color: var(--text-muted);
}

.pub-link {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--founders-rock);
    margin-left: 6px;
    white-space: nowrap;
    text-decoration: underline;
}

.pub-link:hover {
    color: var(--berkeley-blue);
}