/* =================================================================== 
   Jonathan J Adams - Academic Website v2
   Clean, modern design with fixed sidebar
   Color theme: Orange accent, subtle blue-tinted background
   Typography: Serif (Merriweather)
   =================================================================== */

/* Import fonts */
@import url('https://fonts.googleapis.com/css2?family=Merriweather:ital,wght@0,300;0,400;0,700;1,400&family=Source+Sans+Pro:wght@400;600;700&display=swap');

/* CSS Variables for easy theming */
:root {
    --color-primary: #d35400;
    --color-primary-hover: #b84700;
    --color-primary-light: rgba(211, 84, 0, 0.1);
    --color-text: #2c3e50;
    --color-text-light: #555;
    --color-text-muted: #777;
    --color-background: #e8eff5;
    --color-background-alt: #ffffff;
    --color-sidebar-bg: #ffffff;
    --color-border: #d0dce5;
    --color-link: #d35400;
    --font-serif: 'Merriweather', Georgia, serif;
    --font-sans: 'Source Sans Pro', -apple-system, BlinkMacSystemFont, sans-serif;
    --sidebar-width: 300px;
    --content-max-width: 900px;
    --spacing-unit: 1rem;
}

/* Reset and base */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-serif);
    font-size: 17px;
    line-height: 1.75;
    color: var(--color-text);
    background: var(--color-background);
}

/* Links */
a {
    color: var(--color-link);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-primary-hover);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-sans);
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text);
    margin: 0 0 0.75rem 0;
}

h1 { font-size: 1.75rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }

p {
    margin: 0 0 1rem 0;
}

/* =================================================================== 
   Layout: Fixed Sidebar + Scrolling Content
   =================================================================== */

.page-wrapper {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--color-sidebar-bg);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    padding: 1.5rem 1.5rem;
    overflow-y: auto;
    z-index: 100;
}

.sidebar-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* Profile section */
.profile {
    text-align: center;
    margin-bottom: 1rem;
}

.profile-photo {
    width: 100%;
    max-width: 240px;
    height: auto;
    border-radius: 8px;
    object-fit: contain;
    margin-bottom: 1rem;
    border: 3px solid var(--color-background);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.profile-name {
    font-family: var(--font-sans);
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 0 0.5rem 0;
    color: var(--color-text);
}

.profile-title {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin: 0 0 0.25rem 0;
    line-height: 1.5;
}

.profile-affiliation {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin: 0;
}

/* Social links */
.social-links {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin: 0.75rem 0;
    flex-wrap: wrap;
}

.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--color-background);
    color: var(--color-text-light);
    font-size: 1.1rem;
    transition: all 0.2s ease;
}

.social-link:hover {
    background: var(--color-primary);
    color: white;
}

/* CV Button */
.cv-button {
    display: block;
    text-align: center;
    padding: 0.6rem 1.25rem;
    background: var(--color-primary);
    color: white;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 0.9rem;
    border-radius: 6px;
    margin: 0.75rem 0;
    transition: background 0.2s ease;
}

.cv-button:hover {
    background: var(--color-primary-hover);
    color: white;
}

/* Sidebar navigation */
.sidebar-nav {
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--color-border);
}

.sidebar-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar-nav li {
    margin: 0;
}

.sidebar-nav a {
    display: block;
    padding: 0.4rem 0;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-light);
    transition: color 0.2s ease;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
    color: var(--color-primary);
}

/* =================================================================== 
   Main Content Area
   =================================================================== */

.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    min-height: 100vh;
}

.content-wrapper {
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: 3rem 2.5rem;
}

/* Sections */
.section {
    margin-bottom: 3.5rem;
    scroll-margin-top: 2rem;
}

.section-title {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 1.75rem;
    padding-bottom: 0.75rem;
    border-bottom: 3px solid var(--color-primary);
    display: inline-block;
}

/* About section */
.about-text {
    font-size: 1.05rem;
    line-height: 1.8;
}

.research-interests {
    margin-top: 1rem;
}

.research-interests strong {
    color: var(--color-primary);
}

/* =================================================================== 
   Paper Cards
   =================================================================== */

.paper {
    background: var(--color-background-alt);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.25rem;
    border: 1px solid var(--color-border);
    transition: box-shadow 0.2s ease;
}

.paper:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.paper-title {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 600;
    margin: 0 0 0.5rem 0;
    color: var(--color-text);
    line-height: 1.4;
}

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

.paper-authors a {
    color: var(--color-text-light);
    text-decoration: underline;
    text-decoration-color: rgba(0,0,0,0.2);
    text-underline-offset: 2px;
}

.paper-authors a:hover {
    color: var(--color-primary);
}

.paper-venue {
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
}

.paper-venue .journal {
    font-weight: 700;
    color: var(--color-text);
}

.paper-venue .status {
    color: var(--color-text-muted);
    font-style: italic;
}

/* Abstract toggle */
.abstract-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: 0.25rem 0;
    margin-bottom: 0.5rem;
    transition: color 0.2s ease;
    background: none;
    border: none;
}

.abstract-toggle:hover {
    color: var(--color-primary);
}

.abstract-toggle .icon {
    font-size: 0.75rem;
    transition: transform 0.2s ease;
}

.abstract-toggle.active .icon {
    transform: rotate(90deg);
}

.paper-abstract {
    display: none;
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--color-text-light);
    padding: 1rem;
    background: var(--color-background);
    border-radius: 6px;
    margin: 0.75rem 0;
    border-left: 3px solid var(--color-primary);
}

.paper-abstract.show {
    display: block;
}

/* Paper buttons/links */
.paper-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.paper-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.4rem 0.85rem;
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.paper-link.primary {
    background: var(--color-primary);
    color: white;
}

.paper-link.primary:hover {
    background: var(--color-primary-hover);
    color: white;
}

.paper-link.secondary {
    background: var(--color-primary);
    color: white;
}

.paper-link.secondary:hover {
    background: var(--color-primary-hover);
    color: white;
}

/* =================================================================== 
   Footer
   =================================================================== */

.footer {
    margin-top: 3rem;
    padding: 2rem 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

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

.footer-address {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-bottom: 1rem;
    line-height: 1.6;
}

/* =================================================================== 
   Mobile Responsiveness
   =================================================================== */

@media (max-width: 1024px) {
    :root {
        --sidebar-width: 280px;
    }
    
    .content-wrapper {
        padding: 2.5rem 2rem;
    }
}

@media (max-width: 768px) {
    .page-wrapper {
        flex-direction: column;
    }
    
    .sidebar {
        position: relative;
        width: 100%;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--color-border);
        padding: 2rem 1.5rem;
    }
    
    .sidebar-nav {
        display: none;
    }
    
    /* Mobile nav */
    .mobile-nav {
        display: block;
        background: var(--color-sidebar-bg);
        border-bottom: 1px solid var(--color-border);
        padding: 0.75rem 1.5rem;
        position: sticky;
        top: 0;
        z-index: 99;
    }
    
    .mobile-nav ul {
        display: flex;
        justify-content: center;
        flex-wrap: wrap;
        gap: 0.5rem 1.25rem;
        list-style: none;
        padding: 0;
        margin: 0;
    }
    
    .mobile-nav a {
        font-family: var(--font-sans);
        font-size: 0.85rem;
        font-weight: 600;
        color: var(--color-text-light);
    }
    
    .mobile-nav a:hover {
        color: var(--color-primary);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .content-wrapper {
        padding: 2rem 1.25rem;
    }
    
    .profile-photo {
        width: 100%;
        max-width: 260px;
        height: auto;
    }
    
    .paper {
        padding: 1.25rem;
    }
    
    .paper-links {
        flex-direction: row;
        justify-content: flex-start;
        gap: 0.4rem;
    }

    .paper-link {
        justify-content: center;
        padding: 0.35rem 0.7rem;
        font-size: 0.78rem;
    }
}

/* Hide mobile nav on desktop */
.mobile-nav {
    display: none;
}

@media (max-width: 768px) {
    .mobile-nav {
        display: block;
    }
}

/* =================================================================== 
   Utility Classes
   =================================================================== */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Smooth fade-in animation */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.section {
    animation: fadeIn 0.5s ease forwards;
}