/* Color Scheme - Forest/Park Ranger Vibes */
:root {
    --bg-main: #FAF9F6;
    --bg-secondary: #E8E8E6;
    --bg-warm: #F5F4EF;
    --text-main: #3a3a35;
    --text-secondary: #4a4a2d;
    --accent: #C25A2E;
    --accent-hover: #A64D27;
    --olive: #4a4a2d;
    --olive-light: #5c5c38;
    --olive-dark: #3a3a24;
    --topo-line: rgba(74, 74, 45, 0.15);
}

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

body {
    font-family: 'Nunito Sans', 'Avenir', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-warm);
    color: var(--text-main);
    line-height: 1.7;
    font-size: 1rem;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Fjalla One', sans-serif;
    color: var(--text-main);
    letter-spacing: 0.5px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Topographic Background Pattern - More organic curves */
.topo-bg {
    position: relative;
}

.topo-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 800 600'%3E%3Cpath fill='none' stroke='%234a4a2d' stroke-width='1' opacity='0.12' d='M-50,300 Q100,250 200,280 T400,260 T600,300 T850,270'/%3E%3Cpath fill='none' stroke='%234a4a2d' stroke-width='1' opacity='0.1' d='M-50,200 Q50,150 150,180 T350,150 T550,190 T750,160 T850,180'/%3E%3Cpath fill='none' stroke='%234a4a2d' stroke-width='1' opacity='0.1' d='M-50,400 Q80,450 180,420 T380,460 T580,410 T780,450 T850,420'/%3E%3Cpath fill='none' stroke='%234a4a2d' stroke-width='1' opacity='0.08' d='M-50,120 Q120,80 220,110 T420,70 T620,120 T850,90'/%3E%3Cpath fill='none' stroke='%234a4a2d' stroke-width='1' opacity='0.08' d='M-50,500 Q60,540 180,510 T400,550 T620,500 T850,530'/%3E%3Cpath fill='none' stroke='%234a4a2d' stroke-width='1' opacity='0.06' d='M-50,50 Q150,20 250,60 T450,30 T650,70 T850,40'/%3E%3Cpath fill='none' stroke='%234a4a2d' stroke-width='1' opacity='0.06' d='M-50,580 Q100,550 200,570 T400,540 T600,580 T850,550'/%3E%3C/svg%3E");
    background-size: 800px 600px;
    pointer-events: none;
    z-index: 0;
}

/* Navigation */
.navbar {
    background-color: var(--bg-secondary);
    padding: 1.25rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 3px solid var(--accent);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    text-decoration: none;
    font-family: 'Fjalla One', sans-serif;
    font-size: 1.5rem;
    color: var(--text-main);
    letter-spacing: 0.5px;
}

.nav-brand:visited,
.nav-brand:hover {
    color: var(--text-main);
}

/* Mobile Toggle Button */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
}

.nav-toggle span {
    display: block;
    width: 100%;
    height: 3px;
    background-color: var(--text-main);
    border-radius: 2px;
    transition: all 0.3s;
}

.nav-toggle.nav-open span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 6px);
}

.nav-toggle.nav-open span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.nav-open span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -6px);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0;
    align-items: center;
}

/* Dropdown Styles */
.nav-dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--bg-main);
    border: 1px solid var(--olive);
    border-top: none;
    list-style: none;
    min-width: 160px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s;
    z-index: 200;
}

.nav-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li a {
    display: block;
    padding: 0.75rem 1.25rem;
    border: none;
    border-bottom: 1px solid var(--bg-secondary);
    text-align: left;
    color: var(--text-main);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.dropdown-menu li a:visited {
    color: var(--text-main);
}

.dropdown-menu li a:hover,
.dropdown-menu li a:focus {
    background-color: var(--bg-secondary);
    color: var(--accent);
}

.dropdown-menu li:last-child a {
    border-bottom: none;
}

.nav-menu > li > a {
    display: block;
    color: var(--text-main);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.85rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    padding: 0.7rem 1.25rem;
    border: 1px solid var(--olive);
    border-right: none;
    background-color: var(--bg-main);
    transition: all 0.2s;
}

.nav-menu > li:last-child > a {
    border-right: 1px solid var(--olive);
}

.nav-menu > li > a:hover,
.nav-menu > li > a:focus {
    background-color: var(--accent);
    color: var(--bg-main);
    border-color: var(--accent);
    outline: none;
}

.nav-menu > li > a.active {
    background-color: var(--olive);
    color: var(--bg-main);
    border-color: var(--olive);
}

/* Focus styles for accessibility */
a:focus-visible,
button:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 2px;
}

/* Hero Section */
.hero {
    background-color: var(--olive);
    padding: 0.75rem 0;
    text-align: center;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('images/topo-overlay.png');
    background-size: cover;
    background-position: center;
    opacity: 0.15;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-logo {
    max-width: 850px;
    width: 95%;
    height: auto;
}

.hero h1 {
    font-size: 3.2rem;
    margin-bottom: 1rem;
    color: var(--bg-main);
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--bg-main);
    margin-bottom: 2rem;
    max-width: 550px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.95;
    text-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.85rem 2rem;
    background-color: var(--olive);
    color: var(--bg-main);
    text-decoration: none;
    border-radius: 3px;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s;
    border: 2px solid var(--olive);
}

.btn:hover,
.btn:focus {
    background-color: var(--olive-dark);
    border-color: var(--olive-dark);
    transform: translateY(-2px);
}

.btn-accent {
    background-color: var(--accent);
    border-color: var(--accent);
}

.btn-accent:hover,
.btn-accent:focus {
    background-color: var(--accent-hover);
    border-color: var(--accent-hover);
}

.btn-secondary {
    background-color: transparent;
    border: 2px solid var(--olive);
    color: var(--olive);
}

.btn-secondary:hover,
.btn-secondary:focus {
    background-color: var(--olive);
    color: var(--bg-main);
}

/* Sections */
.section {
    padding: 4rem 0;
    position: relative;
}

.section-olive {
    background-color: var(--olive);
    color: var(--bg-main);
}

.section-olive h2,
.section-olive h3 {
    color: var(--bg-main);
}

.section-olive p {
    color: var(--bg-main);
    opacity: 0.95;
}

.section-gray {
    background-color: var(--bg-secondary);
}

.section-warm {
    background-color: var(--bg-warm);
}

.section h2 {
    font-size: 2.2rem;
    margin-bottom: 1rem;
    text-align: center;
}

.section-intro {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Divider with topo accent */
.section-divider {
    height: 4px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    margin: 0;
}

/* Research Grid */
.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.research-card {
    background-color: var(--bg-main);
    padding: 2rem;
    border-radius: 4px;
    border-left: 4px solid var(--accent);
    transition: transform 0.3s, box-shadow 0.3s;
}

.research-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(58, 58, 53, 0.15);
}

.research-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.75rem;
    color: var(--olive-dark);
}

.research-card p {
    color: var(--text-main);
    font-size: 1rem;
}

.research-meta {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-style: italic;
    margin-top: 1rem;
}

/* Alumni Cards */
.alumni-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.alumni-card {
    background-color: var(--bg-main);
    padding: 1.5rem;
    border-radius: 4px;
    border-left: 4px solid var(--olive);
}

.alumni-card h3 {
    font-family: 'Fjalla One', sans-serif;
    font-size: 1.2rem;
    color: var(--text-main);
    margin-bottom: 0.25rem;
}

.alumni-degree {
    color: var(--accent);
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
}

.alumni-current {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.alumni-card .person-links {
    justify-content: flex-start;
}

/* News Preview */
.news-preview {
    max-width: 800px;
    margin: 0 auto 2rem;
}

.news-item {
    background-color: rgba(250, 249, 246, 0.15);
    padding: 1.5rem;
    margin-bottom: 1rem;
    border-radius: 4px;
    border-left: 3px solid var(--accent);
}

.news-date {
    color: var(--bg-main);
    font-size: 0.9rem;
    font-weight: 600;
}

.news-item h3 {
    margin: 0.4rem 0;
    font-size: 1.25rem;
}

.news-item p {
    font-size: 1rem;
}

/* Footer */
.footer {
    background-color: var(--olive-dark);
    color: var(--bg-main);
    text-align: center;
    padding: 2.5rem 0;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('images/topo-overlay.png');
    background-size: cover;
    background-position: center;
    opacity: 0.12;
    pointer-events: none;
    transform: rotate(180deg);
}

.footer .container {
    position: relative;
    z-index: 1;
}

.footer-logo {
    height: 80px;
    width: auto;
    margin-bottom: 1rem;
}

.footer-social {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.footer-social a {
    color: var(--bg-main);
    opacity: 0.8;
    transition: opacity 0.2s, transform 0.2s;
}

.footer-social a:hover {
    opacity: 1;
    transform: translateY(-2px);
}

.footer p {
    color: var(--bg-main);
    font-size: 0.95rem;
    opacity: 0.8;
}

/* Prospective Students Section */
.prospective-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.prospective-card {
    background-color: var(--bg-main);
    padding: 2rem;
    border-radius: 4px;
    border-top: 4px solid var(--accent);
}

.prospective-card h3 {
    font-family: 'Fjalla One', sans-serif;
    font-size: 1.3rem;
    color: var(--olive-dark);
    margin-bottom: 1rem;
}

.prospective-card p {
    color: var(--text-main);
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.prospective-link {
    display: inline-block;
    color: var(--accent);
    font-weight: 600;
    text-decoration: none;
    transition: color 0.2s;
}

.prospective-link:hover,
.prospective-link:focus {
    color: var(--accent-hover);
    text-decoration: underline;
}

.footer-logo {
    height: 80px;
    width: auto;
    margin-bottom: 1rem;
}

.footer p {
    color: var(--bg-main);
    font-size: 0.95rem;
}

/* Page Header */
.page-header {
    background-color: var(--olive);
    padding: 2.5rem 0;
    text-align: center;
    position: relative;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('images/topo-overlay.png');
    background-size: cover;
    background-position: center;
    opacity: 0.15;
    pointer-events: none;
}

.page-header h1 {
    font-size: 2.8rem;
    color: var(--bg-main);
    position: relative;
    z-index: 1;
}

/* Content Blocks */
.about-intro {
    display: flex;
    align-items: center;
    gap: 3rem;
    max-width: 900px;
    margin: 0 auto 3rem;
    background-color: var(--bg-main);
    padding: 2.5rem;
    border-radius: 4px;
    border-left: 4px solid var(--accent);
}

.about-logo {
    width: 400px;
    height: auto;
    flex-shrink: 0;
}

.about-intro-text h2 {
    text-align: left;
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--olive-dark);
}

.about-intro-text p {
    font-size: 1.05rem;
    color: var(--text-main);
    line-height: 1.7;
}

.about-two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto 2.5rem;
}

.about-two-col .content-block {
    margin: 0;
}

.content-block {
    max-width: 800px;
    margin: 0 auto 2.5rem;
    background-color: var(--bg-main);
    padding: 2rem;
    border-radius: 4px;
    border-left: 4px solid var(--accent);
}

.content-block h2 {
    text-align: left;
    font-size: 1.6rem;
    margin-bottom: 1rem;
    color: var(--olive-dark);
}

.content-block p {
    margin-bottom: 1rem;
    font-size: 1.05rem;
    color: var(--text-main);
}

.content-list {
    list-style: none;
    padding-left: 0;
}

.content-list li {
    padding-left: 1.5rem;
    margin-bottom: 0.5rem;
    position: relative;
    font-size: 1.05rem;
    color: var(--text-main);
}

.content-list li::before {
    content: '◆';
    color: var(--accent);
    position: absolute;
    left: 0;
    font-size: 0.6rem;
    top: 0.5rem;
}

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

.content-list a:visited {
    color: var(--accent);
}

.content-list a:hover,
.content-list a:focus {
    color: var(--accent-hover);
    text-decoration: underline;
}

.contact-info {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 4px;
    border-left: 3px solid var(--accent);
}

.contact-info p {
    color: var(--text-main);
}

/* People Page */
.people-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.person-card {
    background-color: var(--bg-main);
    padding: 2rem;
    border-radius: 4px;
    text-align: center;
    border-top: 4px solid var(--accent);
    transition: transform 0.3s, box-shadow 0.3s;
    display: flex;
    flex-direction: column;
}

.person-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(58, 58, 53, 0.15);
}

.person-photo-placeholder {
    width: 140px;
    height: 140px;
    background: linear-gradient(135deg, var(--olive) 0%, var(--olive-dark) 100%);
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-main);
    font-weight: 600;
    font-size: 0.9rem;
    border: 3px solid var(--accent);
}

.person-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.4rem;
    color: var(--text-main);
}

.person-title {
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 1rem;
    font-size: 1rem;
}

.person-bio {
    color: var(--text-main);
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.person-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: auto;
}

.person-link {
    color: var(--olive);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    padding: 0.4rem 0.8rem;
    border: 1px solid var(--olive);
    border-radius: 3px;
    transition: all 0.2s;
}

.person-link:hover,
.person-link:focus {
    background-color: var(--olive);
    color: var(--bg-main);
}

.person-contact {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

   .person-photo {
       width: 140px;
       height: 140px;
       border-radius: 50%;
       object-fit: cover;
       margin: 0 auto 1.5rem;
       display: block;
       border: 3px solid var(--accent);
   }

/* PI Card - subtle differentiation */
.person-card-pi {
    border-top-color: var(--olive);
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-main) 15%);
}

.person-card-pi .person-photo-placeholder {
    border-color: var(--olive);
}

.person-card-pi .person-title {
    color: var(--olive);
}

/* Publications Page */
.publications-list {
    max-width: 900px;
    margin: 0 auto;
}

.pub-year {
    margin-bottom: 2.5rem;
}

.pub-year h2 {
    text-align: left;
    font-size: 1.8rem;
    color: var(--olive-dark);
    border-bottom: 3px solid var(--accent);
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
}

.publication {
    background-color: var(--bg-main);
    padding: 1.5rem;
    margin-bottom: 1rem;
    border-radius: 4px;
    border-left: 3px solid var(--olive);
}

.pub-authors {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 0.4rem;
}

.pub-title {
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 0.4rem;
    color: var(--text-main);
}

.pub-venue {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
}

.pub-link {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: color 0.3s;
}

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

/* News Page */
.news-list {
    max-width: 800px;
    margin: 0 auto;
}

.news-article {
    background-color: var(--bg-main);
    padding: 2rem;
    margin-bottom: 1.5rem;
    border-radius: 4px;
    border-left: 4px solid var(--accent);
}

.news-article .news-date {
    color: var(--accent);
    font-size: 0.95rem;
    font-weight: 600;
}

.news-article h2 {
    text-align: left;
    font-size: 1.5rem;
    margin: 0.4rem 0 1rem;
    color: var(--text-main);
}

.news-article p {
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--text-main);
}

.news-image {
    width: 100%;
    max-width: 500px;
    height: auto;
    border-radius: 4px;
    margin: 1rem 0;
    border: 1px solid var(--bg-secondary);
}

/* Responsive */
@media (max-width: 900px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--bg-secondary);
        flex-direction: column;
        padding: 1rem;
        gap: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s;
        border-bottom: 3px solid var(--accent);
    }
    
    .nav-menu.nav-open {
        max-height: 500px;
    }
    
    .nav-menu > li {
        width: 100%;
    }
    
    .nav-menu > li > a {
        border: none;
        border-bottom: 1px solid var(--bg-main);
        text-align: center;
        padding: 1rem;
    }
    
    .nav-menu > li:last-child > a {
        border-right: none;
    }
    
    /* Mobile Dropdowns */
    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        max-height: 0;
        overflow: hidden;
        border: none;
        background-color: var(--bg-main);
        transition: max-height 0.3s;
    }
    
    .nav-dropdown.dropdown-open .dropdown-menu {
        max-height: 200px;
    }
    
    .dropdown-menu li a {
        padding: 0.75rem 2rem;
        font-size: 0.8rem;
    }
    
    .hero-logo {
        max-width: 450px;
    }
    
    .hero h1 {
        font-size: 2.2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .about-intro {
        flex-direction: column;
        text-align: center;
        gap: 1.5rem;
    }
    
    .about-logo {
        width: 150px;
    }
    
    .about-intro-text h2 {
        text-align: center;
    }
    
    .about-two-col {
        grid-template-columns: 1fr;
    }

    .research-grid {
        grid-template-columns: 1fr;
    }
    
    .page-header h1 {
        font-size: 2rem;
    }
    
    .people-grid {
        grid-template-columns: 1fr;
    }
    
    .content-block {
        padding: 1.5rem;
    }
    
    .footer-logo {
        height: 60px;
    }
    
    .prospective-grid {
        grid-template-columns: 1fr;
    }
}