/* 
========================================
   Faculty Portfolio Styles 
========================================
*/

/* 
  🎨 Color Palettes Options
  Below are 3 proposed color palettes using CSS variables. 
  By default, "Option 1: Classic Slate & Indigo" is active.
*/

:root {
    /* 
      Option 1: Classic Slate & Indigo (Active)
      Vibe: Traditional academic, high contrast, clean. 
    */
    --bg-color: #ffffff;
    --text-main: #2d3748;
    --text-muted: #718096;
    --primary: #4c51bf; /* Indigo */
    --surface: #f7fafc;
    --border: #e2e8f0;

    /* 
      Option 2: Modern Serif & Forest 
      Vibe: Prestigious, calm, slight editorial feel.
      (Uncomment to use)
      
      --bg-color: #fdfdfc;
      --text-main: #1c1917;
      --text-muted: #57534e;
      --primary: #166534; 
      --surface: #f5f5f4;
      --border: #e7e5e4;
    */

    /* 
      Option 3: Crisp Monotone & Tech Blue
      Vibe: Contemporary, sharp, forward-thinking.
      (Uncomment to use)
      
      --bg-color: #ffffff;
      --text-main: #111827;
      --text-muted: #6b7280;
      --primary: #2563eb; 
      --surface: #f3f4f6;
      --border: #e5e7eb;
    */

    /* Typography */
    /* Import Google Fonts via index.html, fallbacks here */
    --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-serif: "Merriweather", "Georgia", serif;
    --base-size: 16px;
    --line-height: 1.65;

    /* Spacing */
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
    --space-xl: 4rem;

    /* Styling */
    --radius: 8px;
    --max-width: 900px;
}

/* Smooth scrolling for in-page nav links */
html { scroll-behavior: smooth; }

/* Base Styles */
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    position: relative;
    font-family: var(--font-sans);
    color: var(--text-main);
    background-color: var(--bg-color);
    line-height: var(--line-height);
    font-size: var(--base-size);
}

body::before {
    /* Removed background image for a cleaner academic look */
    content: none;
}

a {
    color: var(--primary);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
    transition: color 0.2s ease, text-decoration-color 0.2s ease;
}

a:hover, a:focus {
    color: var(--text-main);
    text-decoration-color: var(--text-main);
}

/* Focus States for Accessibility */
:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 4px;
}

/* Layout */
.container {
    max-width: var(--max-width);
    margin-inline: auto;
    padding: 0 var(--space-md);
}

/* Header & Nav */
.site-header {
    border-bottom: 1px solid rgba(226, 232, 240, 0.6);
    padding: var(--space-lg) 0;
    margin-bottom: 0;
    /* Sticky header with Glassmorphism */
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 100;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: nowrap;
    gap: var(--space-md);
}

.site-title a {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-main);
    text-decoration: none;
    white-space: nowrap;
}

.main-nav ul {
    list-style: none;
    display: flex;
    gap: 1.15rem;
    flex-wrap: nowrap;
}

.main-nav a {
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-muted);
    white-space: nowrap;
}
.main-nav a:hover, .main-nav a[aria-current="page"] {
    color: var(--primary);
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    color: var(--text-main);
}
.menu-toggle svg {
    width: 24px;
    height: 24px;
}

/* Profile Section */
.profile-grid {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 4.5rem;
    align-items: center;
}

.profile-image {
    width: 100%;
    height: auto;
    border-radius: var(--radius);
    object-fit: cover;
    background-color: var(--surface);
    display: block;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.name {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    margin-bottom: var(--space-sm);
    color: var(--text-main);
}

.title {
    font-size: 1.15rem;
    font-weight: 500;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.tagline {
    font-size: 1.15rem;
    font-style: italic;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: var(--space-lg);
    line-height: 1.5;
}

/* Buttons */
.contact-links { display: flex; gap: var(--space-md); flex-wrap: wrap; }
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1.2rem;
    background-color: var(--primary);
    color: var(--bg-color);
    text-decoration: none;
    border-radius: var(--radius);
    font-weight: 500;
    border: 1px solid var(--primary);
    transition: all 0.2s ease;
}

.button:hover, .button:focus {
    background-color: var(--text-main);
    border-color: var(--text-main);
    color: var(--bg-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.button-outline {
    background-color: transparent;
    color: var(--primary);
}
.button-outline:hover {
    background-color: var(--surface);
    color: var(--text-main);
    border-color: var(--text-main);
}

.button-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.55rem 0.65rem;
    background-color: transparent;
    color: var(--primary);
}
.button-icon:hover, .button-icon:focus {
    background-color: var(--surface);
    color: var(--text-main);
    border-color: var(--text-main);
}
.button-icon svg {
    display: block;
}

/* Section Spacing & Hierarchy */
section { 
    padding: var(--space-xl) 0;
    position: relative;
    z-index: 1; /* Ensure content stays above pseudo-element background */
}
/* Add top padding so sticky header doesn't cover section headings */
section[id] { scroll-margin-top: 5rem; }

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

.bg-alternate {
    background-color: var(--surface);
}

.bg-alternate::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100vw;
    background-color: var(--surface);
    z-index: -1;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.story-content {
    font-size: 1.1rem;
    color: var(--text-muted);
    line-height: 1.7;
    max-width: 800px;
}

/* Typography Helpers */
h3 {
    font-size: 1.5rem;
    margin-top: 2.5rem;
    margin-bottom: var(--space-sm);
    border-bottom: 1px solid var(--border);
    padding-bottom: var(--space-sm);
}
.muted-text { color: var(--text-muted); margin-bottom: var(--space-md); }

/* Subsection headings (h4 inside sections) */
.subsection-heading {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-top: var(--space-lg);
    margin-bottom: var(--space-md);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* 
========================================
   Timeline List — used for Education
   and Experience entries 
========================================
*/
.timeline-list {
    list-style: none;
    padding: 0;
    margin: var(--space-md) 0;
}

.timeline-item {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: var(--space-md);
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--border);
}

.timeline-item:last-child { border-bottom: none; }

.timeline-year {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary);
    padding-top: 2px;
    white-space: nowrap;
}

.timeline-content strong {
    display: block;
    font-size: 1rem;
    margin-bottom: 0.15rem;
}

.timeline-org {
    display: block;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.timeline-detail {
    margin-top: var(--space-sm);
    font-size: 0.92rem;
    color: var(--text-muted);
}

/* Badge (e.g. "Magna Cum Laude") */
.badge {
    display: inline-block;
    font-size: 0.75rem;
    background-color: var(--primary);
    color: var(--bg-color);
    padding: 0.15em 0.5em;
    border-radius: 4px;
    vertical-align: middle;
    font-weight: 600;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

/* 
========================================
   Tag List — used for Certifications,
   Research Interests, and Skills
========================================
*/
.tag-list {
    list-style: none;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.tag {
    background: rgba(76, 81, 191, 0.08); /* Light tint of primary */
    border: 1px solid rgba(76, 81, 191, 0.15); /* Soft border */
    padding: 0.35rem 0.85rem;
    border-radius: 9999px; /* Pill shape */
    font-size: 0.88rem;
    color: var(--primary);
    font-weight: 500;
    transition: background 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}

.tag:hover {
    background: rgba(76, 81, 191, 0.15);
    transform: translateY(-1px);
}

/* Tag Color Variants */
.tag-warm .tag {
    background: rgba(234, 88, 12, 0.08); /* Orange tint */
    border-color: rgba(234, 88, 12, 0.15);
    color: #c2410c;
}
.tag-warm .tag:hover {
    background: rgba(234, 88, 12, 0.15);
}

.tag-cool .tag {
    background: rgba(13, 148, 136, 0.08); /* Teal tint */
    border-color: rgba(13, 148, 136, 0.15);
    color: #0f766e;
}
.tag-cool .tag:hover {
    background: rgba(13, 148, 136, 0.15);
}

/* 
========================================
   Publication List — numbered list
   with year badges
========================================
*/
.publication-list {
    list-style: none;
    counter-reset: pub-counter;
    padding: 0;
    margin: var(--space-md) 0;
}

.pub-item {
    display: grid;
    grid-template-columns: 110px 1fr;
    gap: var(--space-md);
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--border);
    counter-increment: pub-counter;
}

.pub-item:last-child { border-bottom: none; }

.pub-year {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--primary);
    padding-top: 2px;
}

.pub-content {
    display: grid;
    grid-template-columns: min-content 1fr;
    grid-template-areas: 
        "badge title"
        "badge journal";
    column-gap: 0.85rem;
    row-gap: 0.15rem;
    align-items: start;
    padding-bottom: var(--space-md);
}

.pub-content strong {
    grid-area: title;
    display: block;
    font-size: 0.98rem;
    line-height: 1.45;
    margin: 0;
}

.pub-journal {
    grid-area: journal;
    display: block;
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* DOI / SSRN link badges */
.pub-doi {
    grid-area: badge;
    display: inline-flex;
    margin: 0;
    margin-top: 0.15rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-decoration: none;
    color: var(--primary);
    border: 1px solid var(--primary);
    padding: 0.15em 0.55em;
    border-radius: 4px;
    letter-spacing: 0.04em;
    transition: background-color 0.2s ease, color 0.2s ease;
    white-space: nowrap;
}

.pub-doi:hover, .pub-doi:focus {
    background-color: var(--primary);
    color: var(--bg-color);
}

.pub-status {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-main);
    background: var(--surface);
    padding: 0.15em 0.5em;
    border-radius: 4px;
    margin-top: 0.4rem;
    margin-bottom: 0.2rem;
    border: 1px solid var(--border);
}

/* Abstracts (Details/Summary) */
.pub-abstract {
    grid-column: 1 / -1;
    margin-top: var(--space-md);
    background: var(--bg-color);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--space-md);
    font-size: 0.95rem;
    color: var(--text-muted);
}
.pub-abstract summary {
    font-weight: 600;
    cursor: pointer;
    color: var(--primary);
    list-style: none;
}
.pub-abstract summary::-webkit-details-marker {
    display: none;
}
.pub-abstract summary::before {
    content: "►";
    font-size: 0.8em;
    margin-right: 0.5rem;
    display: inline-block;
    transition: transform 0.2s;
}
.pub-abstract[open] summary::before {
    transform: rotate(90deg);
}
.pub-abstract p {
    margin-top: var(--space-sm);
    line-height: 1.6;
}

/* Research Interests sub-section */
.research-interests {
    margin-bottom: var(--space-lg);
}

/* 
========================================
   Award & Service Lists
========================================
*/
.award-list,
.service-list {
    list-style: none;
    padding: 0;
    margin: var(--space-md) 0;
}

.award-list li,
.service-list li {
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.95rem;
}

.award-list li:last-child,
.service-list li:last-child { border-bottom: none; }

.award-org {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Language note in skills */
.language-note {
    margin-top: var(--space-md);
    color: var(--text-muted);
    font-style: italic;
}

/* Card Grids for Research/Projects (kept for future use) */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-md);
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: var(--space-lg);
    border-radius: var(--radius);
}

.card h4 {
    margin-bottom: var(--space-sm);
    font-size: 1.1rem;
}

.card p { color: var(--text-muted); margin-bottom: var(--space-md); font-size: 0.95rem; }
.link-arrow::after { content: " →"; }

/* Footer */
.site-footer {
    border-top: 1px solid var(--border);
    padding: var(--space-lg) 0;
    margin-top: var(--space-xl);
    text-align: center;
    color: var(--text-muted);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.social-links { display: flex; gap: var(--space-md); }

/* Responsive adjustments */
@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }
    .main-nav ul {
        display: none;
        flex-direction: column;
        width: 100%;
        position: absolute;
        top: 100%;
        left: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        padding: var(--space-md) var(--space-lg);
        border-bottom: 1px solid var(--border);
        box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
        gap: var(--space-md);
    }
    .main-nav ul.is-open {
        display: flex;
    }
}

@media (max-width: 600px) {
    .profile-grid { grid-template-columns: 1fr; }
    .profile-image-container { max-width: 250px; margin: 0 auto; }
    .header-inner, .footer-inner {
        flex-direction: column;
        align-items: flex-start;
    }
    /* Stack timeline items on small screens */
    .timeline-item,
    .pub-item {
        grid-template-columns: 1fr;
        gap: 0.25rem;
    }
    .main-nav ul {
        gap: var(--space-md);
    }
}