/* ==========================================================================
   Juan Pascual - Academic Website
   Elegant design inspired by modern academic portfolios
   ========================================================================== */

/* CSS Variables */
:root {
    /* Colors */
    --color-bg: #f7f5f2;
    --color-bg-alt: #efecea;
    --color-text: #2d2d2d;
    --color-text-light: #5a5a5a;
    --color-text-muted: #888888;
    --color-accent: #c4927e;
    --color-accent-dark: #a87862;
    --color-link: #6b8e7a;
    --color-link-hover: #4a6b55;
    --color-border: #d4d0cb;
    --color-white: #ffffff;

    /* Typography */
    --font-serif: 'Cormorant Garamond', Georgia, serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Layout */
    --max-width: 1200px;
    --nav-height: 80px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ==========================================================================
   Navigation
   ========================================================================== */

.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background-color: var(--color-bg);
    z-index: 1000;
    border-bottom: 1px solid transparent;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.main-nav.scrolled {
    border-bottom-color: var(--color-border);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-serif);
    font-size: 1.4rem;
    font-weight: 500;
    color: var(--color-text);
    letter-spacing: 0.02em;
}

.nav-logo:hover {
    color: var(--color-text);
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
}

.nav-links a {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: var(--spacing-xs) 0;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-accent);
    transition: width 0.3s ease;
}

.nav-links a:hover {
    color: var(--color-text);
}

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

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
    min-height: 100vh;
    padding-top: calc(var(--nav-height) + var(--spacing-xl));
    padding-bottom: var(--spacing-xl);
    display: flex;
    align-items: center;
}

.hero-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: var(--spacing-lg);
    align-items: center;
}

.badge {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    background-color: var(--color-accent);
    color: var(--color-white);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    border-radius: 2px;
    margin-bottom: var(--spacing-md);
}

.hero-name {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 400;
    line-height: 1.1;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.01em;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-style: italic;
    font-weight: 400;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.affiliations {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.affiliations .separator {
    margin: 0 0.3rem;
}

.hero-bio {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

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

.cv-button {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    border: 2px solid var(--color-text);
    color: var(--color-text);
    font-size: 0.85rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    transition: all 0.3s ease;
}

.cv-button:hover {
    background-color: var(--color-text);
    color: var(--color-bg);
}

.cv-button svg {
    transition: transform 0.3s ease;
}

.cv-button:hover svg {
    transform: translateX(4px);
}

/* Hero Image */
.hero-image {
    display: flex;
    justify-content: flex-end;
}

.image-frame {
    position: relative;
    width: 350px;
    max-width: 100%;
}

.image-frame::before {
    content: '';
    position: absolute;
    top: 15px;
    right: -15px;
    width: 100%;
    height: 100%;
    border: 2px solid var(--color-border);
    z-index: -1;
}

.image-frame img {
    width: 100%;
    aspect-ratio: 3/4;
    object-fit: cover;
    filter: grayscale(10%);
    transition: filter 0.3s ease;
}

.image-frame:hover img {
    filter: grayscale(0%);
}

/* ==========================================================================
   Sections
   ========================================================================== */

.section {
    padding: var(--spacing-xl) 0;
}

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

.section-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

.section-number {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-xs);
}

.section-header h2 {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 400;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.section-subtitle {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 1.1rem;
    color: var(--color-text-muted);
}

/* ==========================================================================
   Papers / Research
   ========================================================================== */

.papers-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.paper {
    padding: var(--spacing-md);
    background-color: var(--color-white);
    border-left: 3px solid var(--color-accent);
    border-radius: 0 4px 4px 0;
    transition: box-shadow 0.3s ease;
}

.paper:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.paper-title {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

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

.paper-authors a {
    color: var(--color-link);
    font-weight: 500;
}

.abstract-toggle {
    margin-top: var(--spacing-sm);
}

.abstract-btn {
    background: none;
    border: none;
    color: var(--color-accent);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    padding: 0;
    transition: color 0.2s ease;
}

.abstract-btn:hover {
    color: var(--color-accent-dark);
}

.abstract-content {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    background-color: var(--color-bg);
    border-radius: 4px;
}

.abstract-content p {
    font-size: 0.95rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ==========================================================================
   Teaching
   ========================================================================== */

.teaching-list {
    max-width: 700px;
}

.teaching-institution {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--color-border);
}

.teaching-item {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

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

.teaching-item h4 {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: 0.25rem;
}

.teaching-item p {
    font-size: 0.95rem;
    color: var(--color-text-light);
}

/* ==========================================================================
   Contact
   ========================================================================== */

.contact-content {
    max-width: 600px;
}

.contact-content p {
    font-size: 1.1rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
}

.email-link {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    color: var(--color-text);
    border-bottom: 2px solid var(--color-accent);
    padding-bottom: 0.25rem;
    transition: border-color 0.2s ease;
}

.email-link:hover {
    color: var(--color-text);
    border-color: var(--color-text);
}

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

.footer {
    padding: var(--spacing-md) 0;
    border-top: 1px solid var(--color-border);
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    text-align: center;
}

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

/* ==========================================================================
   Responsive Design
   ========================================================================== */

@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-image {
        order: -1;
        justify-content: center;
    }

    .image-frame {
        width: 280px;
    }

    .affiliations {
        justify-content: center;
    }

    .cv-button {
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }

    .nav-links {
        display: none;
    }

    .hero {
        padding-top: calc(var(--nav-height) + var(--spacing-lg));
    }

    .hero-name {
        font-size: 2.5rem;
    }

    .hero-title {
        font-size: 1.25rem;
    }

    .section-header h2 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .image-frame {
        width: 240px;
    }

    .image-frame::before {
        top: 10px;
        right: -10px;
    }

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

/* ========================================================================== 
   Conference Presentations (estilo referencia)
   ========================================================================== */
.section-header-line {
    position: relative;
    padding-left: 60px;
}

.section-header-line::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 40px;
    height: 2px;
    background-color: var(--color-accent);
}

.section-header-line h2 {
    font-family: var(--font-serif);
    font-size: clamp(1.8rem, 3vw, 2.5rem);
    font-weight: 400;
    font-style: italic;
}

.conferences-list {
    max-width: 900px;
    margin-top: var(--spacing-lg);
}

.conference-year {
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-border);
}

.conference-year:last-child {
    border-bottom: none;
}

.year-title {
    font-family: var(--font-serif);
    font-size: 1.4rem;
    font-weight: 500;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.conference-items {
    font-family: var(--font-sans);
    font-size: 1rem;
    color: var(--color-text-light);
    line-height: 1.8;
    padding-left: var(--spacing-md);
}

.conference-items em {
    font-style: italic;
    color: var(--color-text-muted);
}

/* Paper Figures */
.paper-figures {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    margin: var(--spacing-md) 0;
}

.paper-figures img {
    width: 100%;
    border-radius: 4px;
    background-color: var(--color-white);
    padding: var(--spacing-xs);
}

@media (max-width: 600px) {
    .paper-figures {
        grid-template-columns: 1fr;
    }
}

/* ==========================================================================
   Dark Mode (Optional - uncomment if wanted)
   ========================================================================== */


@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #1a1a1a;
        --color-bg-alt: #242424;
        --color-text: #f0f0f0;
        --color-text-light: #b0b0b0;
        --color-text-muted: #808080;
        --color-border: #3a3a3a;
        --color-white: #2a2a2a;
    }
}