/* ================================================
   Yury Maximov — Academic Research Page
   Modern academic style with card-based layout
   ================================================ */

:root {
    --color-primary: #1a3a5c;
    --color-accent: #2c6fbb;
    --color-accent-light: #e8f0fe;
    --color-text: #1d1d1f;
    --color-text-secondary: #525258;
    --color-bg: #ffffff;
    --color-bg-alt: #f7f8fa;
    --color-border: #e2e4e8;
    --color-card-shadow: rgba(0, 0, 0, 0.06);
    --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --max-width: 1100px;
    --radius: 10px;
}

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

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

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ── Navigation ── */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.nav.scrolled {
    border-bottom-color: var(--color-border);
    box-shadow: 0 1px 8px rgba(0, 0, 0, 0.04);
}

.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-brand {
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--color-primary);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 28px;
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-decoration: none;
    letter-spacing: 0.01em;
    transition: color 0.2s;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform 0.2s;
}

/* ── Hero ── */
.hero {
    padding: 120px 0 80px;
    border-bottom: 1px solid var(--color-border);
}

.hero-grid {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 48px;
    align-items: start;
}

.hero-photo img {
    width: 200px;
    height: auto;
    border-radius: var(--radius);
    object-fit: cover;
    object-position: center top;
}

.photo-placeholder {
    background: var(--color-bg-alt);
    border: 2px dashed var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.hero-kicker {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent);
    margin-bottom: 8px;
}

.hero h1 {
    font-family: var(--font-serif);
    font-size: 2.8rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.15;
    margin-bottom: 8px;
}

.hero-tagline {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-style: italic;
    color: var(--color-text-secondary);
    margin-bottom: 20px;
}

.hero-bio {
    font-size: 1rem;
    line-height: 1.75;
    color: var(--color-text-secondary);
    max-width: 640px;
    margin-bottom: 20px;
}

.hero-affiliations {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 24px;
}

.affiliation {
    font-size: 0.8rem;
    font-weight: 500;
    padding: 5px 14px;
    background: var(--color-accent-light);
    color: var(--color-accent);
    border-radius: 20px;
}

.hero-links {
    display: flex;
    gap: 12px;
}

/* ── Buttons ── */
.btn {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    padding: 10px 24px;
    border-radius: 6px;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
}

.btn-primary {
    background: var(--color-accent);
    color: #fff;
}

.btn-primary:hover {
    background: #1f5a9e;
}

.btn-outline {
    border: 1.5px solid var(--color-border);
    color: var(--color-text);
}

.btn-outline:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* ── Sections ── */
.section {
    padding: 80px 0;
}

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

.section-title {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 12px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 48px;
    height: 3px;
    background: var(--color-accent);
    border-radius: 2px;
    margin-top: 12px;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    max-width: 680px;
    margin-bottom: 40px;
    line-height: 1.7;
}

/* ── Research Cards ── */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px 28px;
    transition: box-shadow 0.25s, transform 0.25s;
}

.card:hover {
    box-shadow: 0 8px 30px var(--color-card-shadow);
    transform: translateY(-3px);
}

.card-icon {
    font-size: 1.6rem;
    margin-bottom: 16px;
}

.card h3 {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.card p {
    font-size: 0.925rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

/* ── Timeline ── */
.timeline {
    position: relative;
    padding-left: 180px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 160px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: var(--color-border);
}

.timeline-item {
    position: relative;
    padding-bottom: 36px;
}

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

.timeline-item::before {
    content: '';
    position: absolute;
    left: -24px;
    top: 8px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-accent);
    border: 2px solid var(--color-bg-alt);
}

.timeline-date {
    position: absolute;
    left: -180px;
    top: 2px;
    width: 140px;
    text-align: right;
    font-size: 0.825rem;
    font-weight: 600;
    color: var(--color-accent);
    white-space: nowrap;
}

.timeline-content h3 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 2px;
}

.timeline-org {
    font-size: 0.9rem;
    font-style: italic;
    color: var(--color-accent);
    margin-bottom: 6px;
    letter-spacing: 0.01em;
}

.timeline-content p:last-child {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

/* ── Advisory (subsection of Experience) ── */
.advisory-heading {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-top: 48px;
    margin-bottom: 20px;
    padding-top: 28px;
    border-top: 1px solid var(--color-border);
}

.advisory-list {
    list-style: none;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px 40px;
}

.advisory-entry {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.advisory-entry a {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s;
}

.advisory-entry a:hover {
    color: var(--color-accent);
}

.advisory-meta {
    font-size: 0.82rem;
    color: var(--color-text-secondary);
}

.advisory-note {
    font-size: 0.84rem;
    color: #8e8e93;
    line-height: 1.5;
}

/* ── Education ── */
.edu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}

.edu-item {
    padding: 24px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-bg);
}

.edu-item h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 6px;
}

.edu-degree {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: 4px;
}

.edu-year {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-accent);
}

/* ── Publications ── */
.pub-summary {
    display: flex;
    gap: 48px;
    margin-bottom: 28px;
}

.pub-stat {
    display: flex;
    flex-direction: column;
}

.pub-stat-number {
    font-family: var(--font-serif);
    font-size: 2.4rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.1;
}

.pub-stat-label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.pub-venues {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    max-width: 680px;
    margin-bottom: 24px;
}

.pub-cta {
    margin-top: 8px;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

/* Future: Selected publications list */
.pub-section-heading {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    margin: 40px 0 16px;
    color: var(--color-primary);
}

.pub-list {
    list-style: none;
    counter-reset: pub;
}

.pub-item {
    counter-increment: pub;
    padding: 16px 0;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.pub-item::before {
    content: counter(pub) ".";
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: 2px;
}

.pub-title {
    font-weight: 600;
    color: var(--color-text);
}

.pub-authors {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.pub-venue {
    font-size: 0.825rem;
    font-weight: 500;
    color: var(--color-accent);
}

/* ── Teaching ── */
.teaching-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.teaching-card {
    padding: 28px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-bg);
}

.teaching-card h3 {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 14px;
}

.teaching-card ul {
    list-style: none;
    margin-bottom: 14px;
}

.teaching-card li {
    font-size: 0.925rem;
    color: var(--color-text-secondary);
    padding: 4px 0;
    padding-left: 16px;
    position: relative;
}

.teaching-card li::before {
    content: '–';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: 600;
}

.teaching-note {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    font-style: italic;
    line-height: 1.6;
}

/* ── Contact ── */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 32px;
}

.contact-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 28px 20px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--color-text);
    transition: all 0.25s;
    background: var(--color-bg);
}

.contact-card:hover {
    border-color: var(--color-accent);
    box-shadow: 0 4px 20px var(--color-card-shadow);
    transform: translateY(-2px);
}

.contact-icon {
    font-size: 1.5rem;
    margin-bottom: 10px;
}

.contact-label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-secondary);
    margin-bottom: 4px;
}

.contact-value {
    font-size: 0.9rem;
    color: var(--color-accent);
    font-weight: 500;
}

/* ── Page Header (subpages) ── */
.page-header {
    padding: 120px 0 48px;
    border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
    font-family: var(--font-serif);
    font-size: 2.4rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.page-subtitle {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    max-width: 600px;
}

/* ── News Page ── */
.news-year-heading {
    font-family: var(--font-serif);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--color-primary);
    padding-bottom: 12px;
    border-bottom: 2px solid var(--color-accent);
    margin-bottom: 32px;
}

.news-item {
    padding: 28px 0;
    border-bottom: 1px solid var(--color-border);
}

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

.news-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 10px;
}

.news-venue {
    font-size: 0.8rem;
    font-weight: 600;
    padding: 3px 12px;
    background: var(--color-accent);
    color: #fff;
    border-radius: 4px;
}

.news-date {
    font-size: 0.8rem;
    font-weight: 500;
    padding: 3px 12px;
    background: transparent;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    border-radius: 4px;
}

.news-type {
    font-size: 0.8rem;
    font-weight: 500;
    padding: 3px 12px;
    background: var(--color-accent-light);
    color: var(--color-accent);
    border-radius: 4px;
}

.news-title {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 10px;
    line-height: 1.4;
}

.news-body p {
    font-size: 0.925rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 8px;
}

.news-body p:last-child {
    margin-bottom: 0;
}

/* ── Talks & Demos ── */
.talks-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.talk-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 24px 0;
    border-bottom: 1px solid var(--color-border);
    text-decoration: none;
    color: var(--color-text);
    transition: background 0.2s;
}

.talk-item:first-child {
    padding-top: 0;
}

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

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

.talk-icon {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-light);
    color: var(--color-accent);
    border-radius: 50%;
    font-size: 1rem;
    margin-top: 2px;
    transition: background 0.2s, color 0.2s;
}

.talk-item:hover .talk-icon {
    background: var(--color-accent);
    color: #fff;
}

.talk-content h3 {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 6px;
    line-height: 1.4;
    transition: color 0.2s;
}

.talk-item:hover .talk-content h3 {
    color: var(--color-accent);
}

.talk-content p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.65;
}

/* ── Footer ── */
.footer {
    padding: 32px 0;
    text-align: center;
    font-size: 0.825rem;
    color: var(--color-text-secondary);
    border-top: 1px solid var(--color-border);
}

/* ── Responsive ── */
@media (max-width: 768px) {
    .hero {
        padding: 100px 0 60px;
    }

    .hero-grid {
        grid-template-columns: 1fr;
        gap: 24px;
        text-align: center;
    }

    .hero-photo {
        display: flex;
        justify-content: center;
    }

    .hero-photo img {
        width: 160px;
        height: auto;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-bio {
        max-width: none;
    }

    .hero-affiliations {
        justify-content: center;
    }

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

    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.97);
        backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 16px 24px;
        gap: 16px;
        border-bottom: 1px solid var(--color-border);
    }

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

    .nav-toggle {
        display: flex;
    }

    .timeline {
        padding-left: 24px;
    }

    .timeline::before {
        left: 4px;
    }

    .timeline-item::before {
        left: -24px;
    }

    .timeline-date {
        position: static;
        width: auto;
        text-align: left;
        margin-bottom: 4px;
    }

    .advisory-list {
        grid-template-columns: 1fr;
    }

    .pub-summary {
        gap: 28px;
    }

    .section {
        padding: 56px 0;
    }

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

@media (max-width: 480px) {
    .card-grid {
        grid-template-columns: 1fr;
    }

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

    .pub-summary {
        flex-wrap: wrap;
        gap: 20px;
    }
}