/* =========================================
   Victor Rangel — Academic Personal Website
   ========================================= */

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

:root {
    --color-primary: #7d0706;
    --color-primary-light: #a01010;
    --color-text: #2d2d2d;
    --color-text-light: #555;
    --color-text-muted: #888;
    --color-bg: #fafafa;
    --color-white: #fff;
    --color-border: #e0e0e0;
    --color-nav-bg: #1a1a1a;
    --color-nav-text: #f0f0f0;
    --font-sans: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
    --max-width: 820px;
    --nav-height: 56px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.65;
    color: var(--color-text);
    background: var(--color-bg);
    letter-spacing: 0.01em;
    -webkit-font-smoothing: antialiased;
}

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

a:hover {
    color: var(--color-primary-light);
    text-decoration: underline;
}

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

/* --- Navigation --- */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-nav-bg);
    height: var(--nav-height);
    box-shadow: 0 1px 4px rgba(0,0,0,0.15);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-brand {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--color-nav-text);
    text-decoration: none;
    letter-spacing: 0.02em;
}

.nav-brand:hover {
    color: #fff;
    text-decoration: none;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 1.35rem;
}

.nav-links a {
    color: #bbb;
    text-decoration: none;
    font-size: 0.92rem;
    font-weight: 400;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    padding: 0.25rem 0;
    border-bottom: 2px solid transparent;
    transition: color 0.2s, border-color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    color: #fff;
    border-bottom-color: var(--color-primary);
    text-decoration: none;
}

/* Hamburger */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    flex-direction: column;
    gap: 5px;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: #ccc;
    border-radius: 2px;
    transition: transform 0.3s, opacity 0.3s;
}

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

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

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

/* --- Layout --- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.page-content {
    padding-top: 2.5rem;
    padding-bottom: 3rem;
    min-height: calc(100vh - var(--nav-height) - 80px);
}

/* --- Hero / About --- */
.hero {
    display: flex;
    gap: 2.5rem;
    align-items: flex-start;
    padding: 3rem 0 2rem;
}

.hero-image {
    flex-shrink: 0;
    width: 220px;
}

.hero-image img {
    width: 220px;
    height: 220px;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.hero-content {
    flex: 1;
}

.hero-content h1 {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    color: var(--color-text);
}

.hero-content .subtitle {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    margin-bottom: 1rem;
    font-weight: 300;
}

.hero-content p {
    margin-bottom: 0.8rem;
    color: var(--color-text-light);
}

/* Social Links */
.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1.2rem;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--color-nav-bg);
    color: var(--color-nav-text);
    font-size: 1rem;
    transition: background 0.2s, transform 0.2s;
}

.social-links a:hover {
    background: var(--color-primary);
    transform: translateY(-2px);
    text-decoration: none;
}

/* --- Sections --- */
.section {
    margin-bottom: 2.5rem;
}

.section[id] {
    scroll-margin-top: calc(var(--nav-height) + 1rem);
}

.section h2 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.2rem;
    padding-bottom: 0.4rem;
    border-bottom: 2px solid var(--color-primary);
    display: inline-block;
}

.year-heading {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: 0.04em;
    margin: 1.4rem 0 0.2rem;
}

.section h2 + .year-heading {
    margin-top: 0;
}

.research-summary {
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    cursor: pointer;
    padding-bottom: 0.4rem;
    margin-bottom: 1.2rem;
    border-bottom: 2px solid var(--color-primary);
}

.research-summary::-webkit-details-marker {
    display: none;
}

.research-summary h2 {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.research-heading-wrap {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.research-count {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-muted);
}

.research-summary:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 4px;
}

.research-group:not([open]) .research-summary {
    margin-bottom: 0;
}

.research-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 1.6rem;
    height: 1.6rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-primary);
    font-size: 1.1rem;
    font-weight: 700;
    line-height: 1;
}

.research-toggle::before {
    content: "-";
}

.research-group:not([open]) .research-toggle::before {
    content: "+";
}

.research-summary + .year-heading {
    margin-top: 0;
}

.page-title {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--color-text);
}

/* --- Research Interests Grid --- */
.interests-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 0.8rem;
}

.interest-item {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    padding: 0.7rem 1rem;
    background: var(--color-white);
    border-radius: 6px;
    border: 1px solid var(--color-border);
    font-size: 0.95rem;
    color: var(--color-text);
}

.interest-item i {
    color: var(--color-primary);
    font-size: 1.1rem;
    width: 20px;
    text-align: center;
}

/* --- Featured Research / Media --- */
.featured-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 0.9rem;
}

.featured-item {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 1rem;
}

.featured-title {
    font-family: var(--font-serif);
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.35;
    color: var(--color-text);
    margin-bottom: 0.25rem;
}

.featured-meta {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-bottom: 0.35rem;
}

.featured-description {
    font-size: 0.92rem;
    color: var(--color-text-light);
    line-height: 1.5;
    margin-bottom: 0.45rem;
}

.featured-item:has(.paper-links) {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    column-gap: 0.65rem;
    align-items: baseline;
}

.featured-item:has(.paper-links) .paper-links {
    grid-column: 1;
    grid-row: 1;
    margin-top: 0;
}

.featured-item:has(.paper-links) .featured-title {
    grid-column: 2;
    grid-row: 1;
}

.featured-item:has(.paper-links) .featured-meta,
.featured-item:has(.paper-links) .featured-description,
.featured-item:has(.paper-links) .paper-tags {
    grid-column: 1 / -1;
}

.media-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.9rem;
}

.media-card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 1rem;
}

.media-card i {
    color: var(--color-primary);
    font-size: 1.25rem;
    margin-bottom: 0.6rem;
}

.media-card h3 {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    line-height: 1.3;
    margin-bottom: 0.35rem;
}

.media-card p {
    font-size: 0.92rem;
    color: var(--color-text-light);
    line-height: 1.5;
    margin-bottom: 0.45rem;
}

/* --- Updates List --- */
.updates-list {
    list-style: none;
}

.updates-list li {
    display: flex;
    gap: 1rem;
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--color-border);
    align-items: baseline;
}

.updates-list li:last-child {
    border-bottom: none;
}

.update-date {
    flex-shrink: 0;
    font-weight: 600;
    color: var(--color-primary);
    font-size: 0.9rem;
    min-width: 45px;
}

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

/* --- Papers --- */
.paper {
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-border);
}

.paper:last-child {
    border-bottom: none;
}

.paper:has(.paper-links) {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    column-gap: 0.65rem;
    align-items: baseline;
}

.paper:has(.paper-links) .paper-links {
    grid-column: 1;
    grid-row: 1;
    margin-top: 0;
}

.paper-title {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.2rem;
    line-height: 1.4;
}

.paper:has(.paper-links) .paper-title {
    grid-column: 2;
    grid-row: 1;
}

.paper:has(.paper-links) .paper-authors,
.paper:has(.paper-links) .paper-venue,
.paper:has(.paper-links) .paper-description,
.paper:has(.paper-links) .paper-tags,
.paper:has(.paper-links) .paper-note {
    grid-column: 1 / -1;
}

.paper-authors {
    font-size: 0.92rem;
    color: var(--color-text-light);
    margin-bottom: 0.2rem;
}

.paper-venue {
    font-size: 0.92rem;
    color: var(--color-text-light);
    margin-bottom: 0.2rem;
}

.paper-description {
    font-size: 0.92rem;
    color: var(--color-text-light);
    line-height: 1.5;
    margin: 0.35rem 0 0.25rem;
}

.paper-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin: 0.45rem 0 0.2rem;
}

.paper-tags span {
    display: inline-block;
    font-size: 0.74rem;
    font-weight: 600;
    color: var(--color-text-light);
    background: #f4f4f4;
    border: 1px solid var(--color-border);
    border-radius: 3px;
    padding: 0.1rem 0.4rem;
    line-height: 1.35;
}

.venue-status {
    display: inline-block;
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.15rem 0.5rem;
    border-radius: 3px;
    margin-right: 0.3rem;
}

.venue-status.forthcoming {
    background: #e8f5e9;
    color: #2e7d32;
}

.venue-status.rr {
    background: #fff3e0;
    color: #e65100;
}

.venue-status.submitted {
    background: #e3f2fd;
    color: #1565c0;
}

.paper-links {
    font-size: 0.88rem;
    margin-top: 0.3rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
}

.paper-links a {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    background: #f5f5f5;
    border-radius: 3px;
    font-size: 0.82rem;
    font-weight: 600;
    text-transform: lowercase;
    letter-spacing: 0.02em;
    transition: background 0.2s;
}

.paper-links a:hover {
    background: var(--color-primary);
    color: #fff;
    text-decoration: none;
}

.paper-note {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    font-style: italic;
    margin-top: 0.3rem;
    padding-left: 0.8rem;
    border-left: 2px solid var(--color-border);
}

.section-divider {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 2rem 0;
}

/* --- CV --- */
.cv-download {
    margin-bottom: 2.5rem;
}

.last-updated {
    font-size: 0.88rem;
    color: var(--color-text-muted);
    margin-top: 0.55rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.7rem 1.5rem;
    background: var(--color-primary);
    color: #fff;
    border-radius: 5px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: background 0.2s, transform 0.1s;
    text-decoration: none;
}

.btn:hover {
    background: var(--color-primary-light);
    transform: translateY(-1px);
    color: #fff;
    text-decoration: none;
}

.cv-entry {
    margin-bottom: 1rem;
    padding-bottom: 0.8rem;
    border-bottom: 1px solid var(--color-border);
}

.cv-entry:last-child {
    border-bottom: none;
}

.cv-entry-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.cv-entry-title {
    font-weight: 600;
    font-size: 1rem;
}

.cv-entry-date {
    font-size: 0.88rem;
    color: var(--color-text-muted);
    white-space: nowrap;
}

.cv-entry-institution {
    font-size: 0.92rem;
    color: var(--color-text-light);
}

.cv-entry-description {
    font-size: 0.92rem;
    color: var(--color-text-light);
    margin-top: 0.3rem;
    line-height: 1.5;
}

/* --- Footer --- */
footer {
    background: var(--color-nav-bg);
    color: #999;
    padding: 1.5rem 0;
    text-align: center;
    font-size: 0.85rem;
    margin-top: 2rem;
}

footer a {
    color: #bbb;
}

footer a:hover {
    color: #fff;
}

.footer-updated {
    margin-top: 0.25rem;
    color: #777;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 1.5rem;
        padding: 2rem 0 1.5rem;
    }

    .hero-image {
        width: 180px;
    }

    .hero-image img {
        width: 180px;
        height: 180px;
    }

    .hero-content h1 {
        font-size: 1.7rem;
    }

    .social-links {
        justify-content: center;
    }

    .interests-grid {
        grid-template-columns: 1fr;
    }

    .media-grid {
        grid-template-columns: 1fr;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--color-nav-bg);
        flex-direction: column;
        padding: 1rem 1.5rem;
        gap: 0;
        box-shadow: 0 4px 8px rgba(0,0,0,0.15);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links li {
        padding: 0.5rem 0;
    }

    .nav-links a {
        font-size: 1rem;
    }

    .cv-entry-header {
        flex-direction: column;
        gap: 0.1rem;
    }

    .updates-list li {
        flex-direction: column;
        gap: 0.2rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .paper:has(.paper-links),
    .featured-item:has(.paper-links) {
        grid-template-columns: 1fr;
    }

    .paper:has(.paper-links) .paper-links,
    .featured-item:has(.paper-links) .paper-links {
        grid-column: 1;
        grid-row: 1;
        margin-bottom: 0.25rem;
    }

    .paper:has(.paper-links) .paper-title,
    .featured-item:has(.paper-links) .featured-title {
        grid-column: 1;
        grid-row: 2;
    }

    .hero-image {
        width: 150px;
    }

    .hero-image img {
        width: 150px;
        height: 150px;
    }

    .page-title {
        font-size: 1.6rem;
    }

    .section h2 {
        font-size: 1.3rem;
    }
}