/* ============================================
   Vincenzo Iozzo — Personal Website
   Clean, professional, SEO-optimized design
   ============================================ */

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

:root {
    --color-bg: #fafafa;
    --color-bg-alt: #f0f0f0;
    --color-text: #1a1a1a;
    --color-text-secondary: #555;
    --color-accent: #2563eb;
    --color-accent-hover: #1d4ed8;
    --color-border: #e0e0e0;
    --color-nav-bg: rgba(250, 250, 250, 0.92);
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;
    --max-width: 860px;
    --section-padding: 5rem 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: 17px;
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

/* --- Navigation --- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: transparent;
    transition: background 0.3s, box-shadow 0.3s;
}

.nav.scrolled {
    background: var(--color-nav-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    height: 60px;
}

.nav-logo {
    font-weight: 600;
    font-size: 1.05rem;
    color: var(--color-text);
    text-decoration: none;
    letter-spacing: -0.01em;
    white-space: nowrap;
}

.nav-logo:hover {
    text-decoration: none;
    color: var(--color-text);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 1.8rem;
}

.nav-links a {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    font-weight: 450;
    text-decoration: none;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--color-text);
    text-decoration: none;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    -webkit-tap-highlight-color: transparent;
}

.nav-toggle span {
    width: 22px;
    height: 2px;
    background: var(--color-text);
    transition: transform 0.3s, opacity 0.3s;
}

.nav-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

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

.nav-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* --- Hero --- */
.hero {
    padding: 10rem 0 5rem;
    text-align: left;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 0.6rem;
}

.hero-subtitle {
    font-size: 1.3rem;
    color: var(--color-text-secondary);
    margin-bottom: 0.4rem;
}

.hero-subtitle a {
    color: var(--color-text-secondary);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.hero-subtitle a:hover {
    color: var(--color-accent);
}

.hero-tagline {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
}

/* --- Sections --- */
.section {
    padding: var(--section-padding);
}

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

.section h2 {
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 2rem;
}

.section-intro {
    color: var(--color-text-secondary);
    margin-bottom: 2.5rem;
    max-width: 600px;
}

.section-note {
    font-size: 0.92rem;
    color: var(--color-text-secondary);
    margin-bottom: 2rem;
}

/* --- About --- */
.about-content p {
    margin-bottom: 1rem;
    color: var(--color-text);
}

.about-content p:last-child {
    margin-bottom: 0;
}

/* --- Expertise --- */
.expertise-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.2rem;
}

.expertise-item {
    padding: 1.2rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-bg);
    transition: border-color 0.2s;
}

.expertise-item:hover {
    border-color: var(--color-accent);
}

.expertise-item h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.35rem;
}

.expertise-item p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

/* --- Career Timeline --- */
.timeline {
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.5rem;
    bottom: 0.5rem;
    width: 2px;
    background: var(--color-border);
}

.timeline-item {
    position: relative;
    margin-bottom: 2.5rem;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -2rem;
    top: 0.55rem;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-accent);
    transform: translateX(-3px);
}

.timeline-date {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-accent);
    font-family: var(--font-mono);
    margin-bottom: 0.3rem;
}

.timeline-content h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 0.15rem;
}

.timeline-org {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    margin-bottom: 0.5rem;
}

.timeline-org a {
    color: var(--color-text-secondary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.timeline-org a:hover {
    color: var(--color-accent);
}

.timeline-content p:last-child {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* --- Speaking / Talks --- */
.talks-grid {
    display: grid;
    gap: 3rem;
}

.talk-category h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-border);
}

.talk-list {
    list-style: none;
}

.talk-list li {
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-border);
}

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

.talk-title {
    display: block;
    font-weight: 600;
    font-size: 1rem;
}

a.talk-title {
    color: var(--color-text);
}

a.talk-title:hover {
    color: var(--color-accent);
    text-decoration: underline;
}

.talk-venue {
    display: block;
    font-size: 0.88rem;
    color: var(--color-accent);
    font-family: var(--font-mono);
    margin-top: 0.15rem;
}

.talk-desc {
    display: block;
    font-size: 0.92rem;
    color: var(--color-text-secondary);
    margin-top: 0.35rem;
    line-height: 1.5;
}

/* --- Publications & Writing --- */
.writing-category {
    margin-bottom: 2.5rem;
}

.writing-category:last-child {
    margin-bottom: 0;
}

.writing-category h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-border);
}

.writing-list {
    list-style: none;
}

.writing-list li {
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-border);
}

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

.writing-title {
    display: block;
    font-weight: 600;
    font-size: 1rem;
}

a.writing-title:hover {
    text-decoration: underline;
}

.writing-meta {
    display: block;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    font-family: var(--font-mono);
    margin-top: 0.2rem;
}

.writing-desc {
    font-size: 0.92rem;
    color: var(--color-text-secondary);
    margin-top: 0.35rem;
    line-height: 1.5;
}

/* --- Podcasts --- */
.podcast-list {
    list-style: none;
}

.podcast-list li {
    padding: 1.2rem 0;
    border-bottom: 1px solid var(--color-border);
}

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

.podcast-title {
    display: block;
    font-weight: 600;
    font-size: 1.05rem;
}

.podcast-meta {
    display: block;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    font-family: var(--font-mono);
    margin-top: 0.2rem;
}

.podcast-desc {
    font-size: 0.92rem;
    color: var(--color-text-secondary);
    margin-top: 0.35rem;
    line-height: 1.5;
}

/* --- Investments --- */
.investments-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-top: 1.5rem;
}

.investment-item {
    padding: 1.2rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    transition: border-color 0.2s;
}

.investment-item:hover {
    border-color: var(--color-accent);
}

.investment-item h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.investment-item h3 a {
    color: var(--color-text);
}

.investment-item h3 a:hover {
    color: var(--color-accent);
    text-decoration: none;
}

.investment-item p {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    line-height: 1.4;
}

/* --- Contact --- */
.contact-links {
    display: flex;
    flex-wrap: wrap;
    gap: 1.2rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.75rem 1.25rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    color: var(--color-text);
    font-weight: 500;
    font-size: 0.95rem;
    transition: border-color 0.2s, background 0.2s;
}

.contact-item:hover {
    border-color: var(--color-accent);
    background: rgba(37, 99, 235, 0.04);
    text-decoration: none;
    color: var(--color-accent);
}

.contact-item svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

/* --- Footer --- */
.footer {
    padding: 2rem 0;
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    border-top: 1px solid var(--color-border);
}

/* --- Responsive --- */
@media (max-width: 768px) {
    body {
        font-size: 16px;
    }

    .hero {
        padding: 7rem 0 3rem;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .section {
        padding: 3.5rem 0;
    }

    .section h2 {
        font-size: 1.5rem;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--color-bg);
        padding: 1rem 1.5rem;
        gap: 0;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
        z-index: 200;
    }

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

    .nav-links li {
        padding: 0.7rem 0;
        border-bottom: 1px solid var(--color-border);
    }

    .nav-links li:last-child {
        border-bottom: none;
    }

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

    .timeline {
        padding-left: 1.5rem;
    }

    .timeline-item::before {
        left: -1.5rem;
    }

    .contact-links {
        flex-direction: column;
    }

    .contact-item {
        justify-content: center;
    }

    .expertise-grid,
    .investments-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.8rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .container {
        padding: 0 1rem;
    }
}

/* --- Newsroom / News Articles --- */
.news-list {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.news-item {
    padding-bottom: 2.5rem;
    border-bottom: 1px solid var(--color-border);
}

.news-item:last-of-type {
    border-bottom: none;
    padding-bottom: 0;
}

.news-header {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
}

.news-date {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-accent);
    font-family: var(--font-mono);
}

.news-publication {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    font-family: var(--font-mono);
    padding: 0.2rem 0.6rem;
    background: var(--color-bg-alt);
    border-radius: 4px;
}

.news-title {
    font-size: 1.4rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

.news-title a {
    color: var(--color-text);
    text-decoration: none;
}

.news-title a:hover {
    color: var(--color-accent);
    text-decoration: underline;
}

.news-summary {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    margin-bottom: 1rem;
}

.news-summary strong {
    font-weight: 600;
}

.news-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.topic-tag {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    background: var(--color-bg-alt);
    padding: 0.3rem 0.75rem;
    border-radius: 4px;
    font-weight: 500;
    border: 1px solid var(--color-border);
}

.news-cta {
    margin-top: 4rem;
    padding: 2rem;
    background: var(--color-bg-alt);
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.news-cta h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.news-cta p {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* --- Print --- */
@media print {
    .nav, .nav-toggle {
        display: none;
    }

    .hero {
        padding-top: 2rem;
    }

    .section, .section-alt {
        background: white;
        padding: 2rem 0;
    }

    a {
        color: var(--color-text);
    }

    a[href]::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
        color: var(--color-text-secondary);
    }
}