/* ===================================
   CSS VARIABLES & ROOT STYLES
   =================================== */
:root {
    --color-bg: #fdfcfb;
    --color-text: #1a1a1a;
    --color-text-light: #4a4a4a;
    --color-text-lighter: #757575;
    --color-accent: #8b4513;
    --color-accent-hover: #6b3410;
    --color-border: #e8e4df;
    --color-card-bg: #ffffff;
    
    --font-serif: 'Crimson Pro', Georgia, serif;
    --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    --spacing-xl: 4rem;
    
    --transition-fast: 0.15s ease;
    --transition-medium: 0.3s ease;
}

/* ===================================
   RESET & BASE STYLES
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-serif);
    font-size: 18px;
    line-height: 1.75;
    color: var(--color-text);
    background-color: var(--color-bg);
    padding: var(--spacing-lg);
    position: relative;
    overflow-x: hidden;
}

/* Subtle grain texture overlay */
.grain-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: 0.03;
    z-index: 9999;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='3.5' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
    position: relative;
}

/* ===================================
   ANIMATIONS
   =================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.8s ease forwards;
}

.fade-in-delay-1 {
    animation: fadeIn 0.8s ease 0.2s forwards;
    opacity: 0;
}

.fade-in-delay-2 {
    animation: fadeIn 0.8s ease 0.4s forwards;
    opacity: 0;
}

.fade-in-delay-3 {
    animation: fadeIn 0.8s ease 0.6s forwards;
    opacity: 0;
}

.fade-in-delay-4 {
    animation: fadeIn 0.8s ease 0.8s forwards;
    opacity: 0;
}

/* ===================================
   ANNOUNCEMENT BOX
   =================================== */
   .announcement-box {
    background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
    color: #ffffff;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: 6px;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: 0 4px 20px rgba(220, 38, 38, 0.3);
    border: 3px solid #991b1b;
    position: relative;
    overflow: hidden;
}

.announcement-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.08) 50%, transparent 70%);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

.announcement-icon {
    font-size: 1.5em;
    flex-shrink: 0;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

.announcement-content {
    font-size: 1em;
    line-height: 1.5;
    position: relative;
    z-index: 1;
    font-weight: 700;
}

.announcement-content strong {
    color: #ffffff;
    font-weight: 800;
    font-size: 1.05em;
    display: inline;
    margin-right: 0.5rem;
    letter-spacing: 0.01em;
}

/* ===================================
   HEADER STYLES
   =================================== */
header {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.header-content {
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: 3.5em;
    font-weight: 300;
    letter-spacing: -0.02em;
    line-height: 1.1;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.first-name {
    font-weight: 600;
    display: block;
}

.last-name {
    font-weight: 300;
    color: var(--color-text-light);
}

.header-meta {
    margin-top: var(--spacing-sm);
}

.subtitle {
    font-size: 1.1em;
    color: var(--color-text-light);
    margin-bottom: 0.25rem;
    font-weight: 400;
    letter-spacing: 0.01em;
}

.email {
    font-family: var(--font-mono);
    font-size: 0.9em;
    color: var(--color-text-lighter);
    letter-spacing: 0.02em;
}

/* Navigation */
nav {
    margin-top: var(--spacing-md);
    font-size: 1em;
    font-weight: 400;
}

.nav-link {
    color: var(--color-text);
    text-decoration: none;
    position: relative;
    transition: color var(--transition-medium);
    padding: 0.25rem 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-accent);
    transition: width var(--transition-medium);
}

.nav-link:hover {
    color: var(--color-accent);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-sep {
    margin: 0 0.75rem;
    color: var(--color-border);
}

/* ===================================
   TYPOGRAPHY
   =================================== */
h2 {
    font-size: 2.5em;
    font-weight: 300;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.5em;
    font-weight: 400;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

h4 {
    font-size: 1.15em;
    font-weight: 600;
    line-height: 1.5;
    color: var(--color-text);
}

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
    border-bottom: 1px solid transparent;
}

a:hover {
    color: var(--color-accent-hover);
    border-bottom-color: var(--color-accent-hover);
}

strong {
    font-weight: 600;
    color: var(--color-text);
}

/* ===================================
   SECTIONS
   =================================== */
section {
    margin-bottom: var(--spacing-xl);
}

.section-header {
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.section-decoration {
    width: 60px;
    height: 2px;
    background: linear-gradient(to right, var(--color-accent), transparent);
    margin-top: var(--spacing-sm);
}

.section-note {
    font-style: italic;
    color: var(--color-text-lighter);
    margin-bottom: var(--spacing-lg);
    font-size: 0.95em;
}

/* ===================================
   PROFILE SECTION
   =================================== */
.profile-section {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.profile-image {
    position: relative;
}

.placeholder-image {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    transition: transform var(--transition-medium);
}

.placeholder-image:hover {
    transform: scale(1.02);
}

.placeholder-image svg {
    width: 100%;
    height: 100%;
}

.placeholder-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center center;
}

.bio {
    padding-top: 0.5rem;
}

.bio p {
    margin-bottom: var(--spacing-sm);
}

.bio-intro {
    font-size: 1.1em;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.bio-outro {
    color: var(--color-text-light);
    margin-top: var(--spacing-md);
}

/* Research Box */
.research-box {
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border);
    padding: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    border-radius: 4px;
}

.research-box h3 {
    margin-top: 0;
    font-size: 1.3em;
    margin-bottom: var(--spacing-md);
}

.research-grid {
    display: grid;
    gap: var(--spacing-md);
}

.research-card {
    padding: var(--spacing-md);
    border-left: 2px solid var(--color-border);
    transition: border-color var(--transition-medium), transform var(--transition-medium);
}

.research-card:hover {
    border-left-color: var(--color-accent);
    transform: translateX(4px);
}

.card-number {
    font-family: var(--font-mono);
    font-size: 0.85em;
    color: var(--color-accent);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.research-card h4 {
    font-size: 1.1em;
    margin-bottom: 0.5rem;
}

.research-card p {
    font-size: 0.95em;
    color: var(--color-text-light);
    line-height: 1.6;
    margin-bottom: 0;
}

/* ===================================
   NEWS SECTION
   =================================== */
.news-list {
    display: grid;
    gap: var(--spacing-md);
}

.news-item {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: var(--spacing-md);
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-border);
    transition: padding-left var(--transition-medium);
}

.news-item:hover {
    padding-left: var(--spacing-sm);
}

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

.date {
    font-family: var(--font-mono);
    font-size: 0.85em;
    color: var(--color-accent);
    font-weight: 500;
    letter-spacing: 0.02em;
}

.news-content {
    color: var(--color-text);
    line-height: 1.6;
}

/* ===================================
   PUBLICATIONS
   =================================== */
.publications-grid {
    display: grid;
    gap: var(--spacing-lg);
}

.publication-card {
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border);
    padding: var(--spacing-lg);
    border-radius: 4px;
    transition: transform var(--transition-medium), box-shadow var(--transition-medium);
    position: relative;
}

.publication-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.06);
}

.pub-year {
    font-family: var(--font-mono);
    font-size: 0.85em;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.pub-title {
    font-size: 1.15em;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    line-height: 1.5;
}

.pub-authors {
    color: var(--color-text-light);
    margin-bottom: 0.5rem;
    font-size: 0.95em;
}

.pub-venue {
    color: var(--color-text-lighter);
    font-style: italic;
    margin-bottom: var(--spacing-sm);
    font-size: 0.95em;
}

.link-button {
    display: inline-block;
    margin-top: var(--spacing-sm);
    padding: 0.5rem 1.25rem;
    background-color: var(--color-text);
    color: var(--color-bg);
    border: none;
    border-radius: 2px;
    font-size: 0.9em;
    font-weight: 500;
    letter-spacing: 0.02em;
    transition: background-color var(--transition-medium), transform var(--transition-fast);
    border-bottom: none;
}

.link-button:hover {
    background-color: var(--color-accent);
    transform: translateX(2px);
}

/* Publications page specific */
.pub-category {
    margin-bottom: var(--spacing-xl);
}

.category-title {
    font-size: 1.8em;
    font-weight: 400;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--color-border);
}

.publication-list {
    display: grid;
    gap: var(--spacing-lg);
}

.publication-item {
    display: grid;
    grid-template-columns: 60px 1fr;
    gap: var(--spacing-md);
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-border);
}

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

.pub-number {
    font-family: var(--font-mono);
    font-size: 0.9em;
    color: var(--color-text-lighter);
    font-weight: 500;
    padding-top: 0.25rem;
}

.pub-content h4 {
    margin-bottom: 0.5rem;
}

.pub-content .pub-authors {
    margin-bottom: 0.25rem;
}

.pub-content .pub-venue {
    margin-bottom: var(--spacing-sm);
}

.pub-links {
    margin-top: var(--spacing-sm);
}

/* ===================================
   FOOTER
   =================================== */
footer {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--color-text-lighter);
    font-size: 0.9em;
}

.footer-note {
    font-family: var(--font-mono);
    font-size: 0.85em;
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */
@media (max-width: 768px) {
    body {
        font-size: 16px;
        padding: var(--spacing-sm);
    }

    .container {
        padding: var(--spacing-lg) var(--spacing-sm);
    }

    h1 {
        font-size: 2.5em;
    }

    h2 {
        font-size: 2em;
    }

    h3 {
        font-size: 1.3em;
    }

    .profile-section {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        text-align: center;
    }

    .placeholder-image {
        margin: 0 auto;
        width: 150px;
        height: 150px;
    }

    .bio {
        padding-top: 0;
    }

    .research-box {
        padding: var(--spacing-md);
    }

    .news-item {
        grid-template-columns: 1fr;
        gap: var(--spacing-xs);
    }

    .date {
        display: block;
    }

    .publication-item {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    .pub-number {
        display: none;
    }

    nav {
        font-size: 0.9em;
        line-height: 2;
    }

    .nav-sep {
        margin: 0 0.5rem;
    }

    .footer-content {
        flex-direction: column;
        gap: var(--spacing-xs);
        text-align: center;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2em;
    }

    .link-button {
        display: block;
        width: 100%;
        text-align: center;
    }
}