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

:root {
    --text: #000;
    --text-secondary: #000;
    --text-light: #000;
    --bg: #fff;
    --bg-subtle: #f8f8f8;
    --border: #e5e5e5;
    --accent: #2a2a2a;
    --link: #1a1a1a;
    --link-hover: #000;
    --max-width: 960px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

html { font-size: 24px; scroll-behavior: smooth; scroll-padding-top: 5rem; }

body {
    font-family: var(--font);
    color: var(--text);
    background: var(--bg);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--link); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--link-hover); }

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

/* Nav */
nav {
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    background: var(--bg);
    z-index: 10;
}
nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.nav-brand {
    display: flex;
    flex-direction: column;
    align-items: center;
}
nav .site-name {
    text-decoration: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    line-height: 1;
}
.nav-social {
    display: flex;
    gap: 0.5rem;
    margin-top: 4px;
}
.nav-social-icon {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    transition: opacity 0.15s;
}
.nav-social-icon:hover { opacity: 0.7; }
.nav-social-icon svg { width: 12px; height: 12px; }
.nav-social-icon.x { color: #000; }
.nav-social-icon.youtube { color: #FF0000; }
.nav-social-icon.email { color: #3D7EC7; }
.nav-logo-mark {
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    font-size: 1rem;
    color: var(--text);
    letter-spacing: 0.04em;
}
.nav-logo-tagline {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.38rem;
    font-weight: 500;
    color: rgba(0,0,0,0.4);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-top: 2px;
}

/* Logo bracket treatment */
.logo-bracket {
    font-family: 'Orbitron', sans-serif;
    font-weight: 400;
    color: #3D7EC7;
    font-size: 1.4em;
    line-height: 0.68;
    margin: 0 1px;
    position: relative;
    top: 0.1em;
}
.hero-banner .logo-bracket {
    color: #4A90D9;
}
nav .nav-links { display: flex; gap: 1.5rem; }
nav .nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 450;
    transition: color 0.15s;
}
nav .nav-links a:hover,
nav .nav-links a.active { color: var(--text); }

/* Nav dropdown */
.nav-dropdown { position: relative; display: flex; align-items: center; }
.nav-dropdown-toggle {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 450;
    transition: color 0.15s;
    cursor: pointer;
    padding-bottom: 1rem;
    margin-bottom: -1rem;
}
.nav-dropdown-toggle:hover,
.nav-dropdown-toggle.active { color: var(--text); }
.nav-dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.4rem 0;
    min-width: auto;
    white-space: nowrap;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    z-index: 20;
}
.nav-dropdown:hover .nav-dropdown-menu { display: block; }
.nav-dropdown-menu a {
    display: block;
    padding: 0.45rem 1rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: background 0.1s, color 0.1s;
}
.nav-dropdown-menu a:hover {
    background: var(--bg-subtle);
    color: var(--text);
}


/* Hero banner */
.hero-banner {
    background: #1a2332;
    color: #fff;
    padding: 3rem 0;
}
.hero-layout {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 3rem;
}
.hero-left {
    flex: 1;
}
.logo-lockup {
    text-align: center;
    margin-bottom: 1rem;
    display: inline-block;
}
.hero-banner h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: 2.2rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    line-height: 1;
    margin-bottom: 0.3rem;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
}
.hero-tagline {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.72rem;
    font-weight: 500;
    color: rgba(255,255,255,0.5);
    line-height: 1;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}
.hero-social {
    display: flex;
    gap: 0.75rem;
}
.hero-social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: rgba(255,255,255,0.08);
    color: rgba(255,255,255,0.6);
    text-decoration: none;
    transition: background 0.15s, color 0.15s;
}
.hero-social-link:hover {
    background: rgba(255,255,255,0.18);
    color: #fff;
}
.hero-social-link svg { width: 15px; height: 15px; }

/* Hero event callout */
.hero-event {
    display: block;
    text-decoration: none;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 6px;
    padding: 1.25rem 1.5rem;
    min-width: 220px;
    transition: background 0.15s, border-color 0.15s;
}
.hero-event:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.2);
}
.hero-event-label {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: #4A90D9;
    margin-bottom: 0.5rem;
}
.hero-event-title {
    font-size: 0.88rem;
    font-weight: 600;
    color: #fff;
    line-height: 1.3;
    margin-bottom: 0.4rem;
}
.hero-event-detail {
    font-size: 0.78rem;
    color: rgba(255,255,255,0.5);
    line-height: 1.4;
}

/* Sections */
.section {
    padding: 2.5rem 0;
    border-top: 1px solid var(--border);
}
.section-title {
    font-size: 1.15rem;
    font-weight: 650;
    letter-spacing: -0.01em;
    margin-bottom: 1.25rem;
}

/* Featured event */
.featured-event {
    display: block;
    text-decoration: none;
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    transition: border-color 0.15s, background 0.15s;
}
.featured-event:hover {
    border-color: #ccc;
    background: var(--bg-subtle);
}
.featured-event-date {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: #3D7EC7;
    margin-bottom: 0.4rem;
}
.featured-event h3 {
    font-size: 1.05rem;
    font-weight: 650;
    line-height: 1.3;
    margin-bottom: 0.3rem;
}
.featured-event p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}
.featured-event-meta {
    font-size: 0.78rem;
    color: var(--text-light);
    margin-top: 0.3rem;
}
.featured-event-link {
    display: inline-block;
    font-size: 0.78rem;
    font-weight: 600;
    color: #3D7EC7;
    margin-top: 0.75rem;
}

/* Conference details (homepage) */
.conference-details {
    margin-top: 0.5rem;
}
.conference-info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.25rem;
}
.conference-info-label {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-light);
    margin-bottom: 0.2rem;
}
.conference-info-value {
    font-size: 0.85rem;
    line-height: 1.5;
}
.conference-collaborators {
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}
.conference-collab-list {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Speaker grid */
.speaker-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
}
.speaker {
    display: flex;
    flex-direction: column;
    padding: 0.6rem 0;
}
.speaker-name {
    font-size: 0.88rem;
    font-weight: 600;
}
.speaker-affil {
    font-size: 0.78rem;
    color: var(--text-secondary);
}

/* Sponsor grid */
.sponsor-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}
.sponsor-group h3 {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-light);
    margin-bottom: 0.6rem;
}
.sponsor-group ul {
    list-style: none;
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* Page header (for inner pages) */
.page-header {
    padding: 2.5rem 0 1.5rem;
}
.page-header.centered {
    text-align: center;
}
.page-header.centered p {
    margin-left: auto;
    margin-right: auto;
}
.page-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.75rem;
}
.page-header p {
    font-size: 0.95rem;
    line-height: 1.7;
    max-width: 40rem;
}

/* Sponsor logo (page-level, e.g. seminar sponsor) */
.sponsor-logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.3rem;
    margin-top: 1rem;
}
.sponsor-logo-label {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-light);
    white-space: nowrap;
}
.sponsor-logo img {
    height: 3.5rem;
    width: auto;
}

/* People lists (for people page) */
.people-section {
    padding: 2rem 0;
    border-top: 1px solid var(--border);
}
.people-section:first-of-type { border-top: none; padding-top: 0; }
.people-section h2 {
    font-size: 1.1rem;
    font-weight: 650;
    letter-spacing: -0.01em;
    margin-bottom: 1rem;
}
.people-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem 2rem;
}
.person {
    display: flex;
    flex-direction: column;
    padding: 0.4rem 0;
    text-align: center;
}
.person-name {
    font-size: 0.9rem;
    font-weight: 500;
}
.person-affil {
    font-size: 0.8rem;
    color: var(--text-secondary);
}
.organizer-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 1rem;
}
.organizer-card {
    text-align: center;
}
.organizer-card img {
    width: 90px;
    height: 90px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 0.75rem;
}
.organizer-card .person-name {
    font-size: 0.95rem;
}
@media (max-width: 640px) {
    .organizer-grid { grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
}

/* Conference page */
.conference-info {
    padding: 2rem 0;
}
.conference-detail {
    font-size: 0.9rem;
    line-height: 1.8;
    margin-bottom: 1rem;
}
.conference-detail strong {
    font-weight: 600;
}

/* Event archive list */
.archive-list {
    list-style: none;
}
.archive-item {
    padding: 1rem 0;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 1rem;
}
.archive-item:last-child { border-bottom: none; }
.archive-title {
    font-size: 0.9rem;
    font-weight: 500;
}
.archive-date {
    font-size: 0.8rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

/* Webinar/symposium event list */
.event-list-item {
    padding: 1rem 0;
    border-bottom: 1px solid var(--border);
}
.event-list-item:last-child { border-bottom: none; }
.event-list-date {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-light);
    margin-bottom: 0.2rem;
}
.event-list-title {
    font-size: 0.92rem;
    font-weight: 600;
    margin-bottom: 0.15rem;
}
.event-list-speaker {
    font-size: 0.85rem;
    color: var(--text-secondary);
}
.event-list-links {
    margin-top: 0.35rem;
    display: flex;
    gap: 0.75rem;
}
.event-list-links a {
    font-size: 0.75rem;
    font-weight: 500;
    color: #fff;
    text-decoration: none;
    background: #000;
    padding: 0.2rem 0.6rem;
    border-radius: 3px;
    transition: opacity 0.15s;
}
.event-list-links a:hover {
    opacity: 0.75;
}

/* Video container (16:9 responsive) */
.video-container {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: 6px;
    margin-top: 0.75rem;
}
.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* Seminar filters */
.seminar-filters {
    display: flex;
    gap: 0.5rem;
    padding: 1rem 0;
    position: sticky;
    top: 3.65rem;
    background: var(--bg);
    z-index: 5;
    border-bottom: 1px solid var(--border);
}
.filter-btn {
    background: none;
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.3rem 0.8rem;
    font-family: var(--font);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s;
}
.filter-btn:hover { border-color: #999; color: var(--text); }
.filter-btn.active {
    background: var(--text);
    border-color: var(--text);
    color: var(--bg);
}

/* Year group headers */
.year-header {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    padding: 1.5rem 0 0.75rem;
    border-bottom: 1px solid var(--border);
    color: var(--text);
}

/* Seminar cards */
.seminar-card {
    padding: 1.25rem 0;
    border-bottom: 1px solid var(--border);
}
.seminar-card:last-child { border-bottom: none; }
.seminar-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.25rem;
}
.seminar-date {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: #3D7EC7;
}
.seminar-badge {
    font-size: 0.6rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 0.12rem 0.45rem;
    border-radius: 3px;
    line-height: 1;
}
.seminar-badge.webinar {
    background: rgba(74, 144, 217, 0.1);
    color: #3D7EC7;
}
.seminar-badge.symposium {
    background: rgba(120, 80, 200, 0.1);
    color: #6B46C1;
}
.seminar-title {
    font-size: 0.92rem;
    font-weight: 600;
    margin-bottom: 0.2rem;
    line-height: 1.35;
}
.seminar-speakers {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Video thumbnail (click to play) */
.video-thumb {
    position: relative;
    margin-top: 0.75rem;
    border-radius: 6px;
    overflow: hidden;
    cursor: pointer;
    aspect-ratio: 16/9;
    max-width: 480px;
    background: #000;
}
.video-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: opacity 0.15s;
}
.video-thumb:hover img { opacity: 0.85; }
.play-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 52px;
    height: 52px;
    background: rgba(0, 0, 0, 0.7);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s;
}
.video-thumb:hover .play-overlay { background: rgba(255, 0, 0, 0.85); }
.play-overlay::after {
    content: '';
    display: block;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 9px 0 9px 16px;
    border-color: transparent transparent transparent #fff;
    margin-left: 3px;
}

/* Conference year cards */
.conf-year-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 1rem;
}
.conf-year-card {
    display: block;
    text-decoration: none;
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 1.25rem;
    transition: border-color 0.15s, background 0.15s;
}
.conf-year-card:hover {
    border-color: #ccc;
    background: var(--bg-subtle);
}
.conf-year-card.current {
    border-color: #4A90D9;
    background: rgba(74, 144, 217, 0.04);
}
.conf-year-card.current:hover {
    background: rgba(74, 144, 217, 0.08);
}
.conf-year-label {
    font-size: 0.68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: #3D7EC7;
    margin-bottom: 0.35rem;
}
.conf-year-title {
    font-size: 0.95rem;
    font-weight: 650;
    margin-bottom: 0.25rem;
}
.conf-year-detail {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Conference year tabs */
.conf-year-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}
.conf-year-tab {
    background: none;
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.35rem 1rem;
    font-family: var(--font);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s;
}
.conf-year-tab:hover { border-color: #999; color: var(--text); }
.conf-year-tab.active {
    background: var(--text);
    border-color: var(--text);
    color: var(--bg);
}

/* Conference year content */
.conf-year-content { display: none; }
.conf-year-content.active { display: block; }
.conf-year-info {
    margin-bottom: 1.5rem;
}
.conf-year-info h3 {
    font-size: 1.1rem;
    font-weight: 650;
    margin-bottom: 0.3rem;
}
.conf-year-meta {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Conference day labels */
.conf-day-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: #3D7EC7;
    padding: 1.25rem 0 0.5rem;
    border-top: 1px solid var(--border);
    margin-top: 0.5rem;
}
.conf-day-label:first-of-type { border-top: none; margin-top: 0; }

/* Conference sessions */
.conf-session {
    padding: 1rem 0;
    border-bottom: 1px solid var(--border);
}
.conf-session:last-child { border-bottom: none; }
.conf-session-name {
    font-size: 0.92rem;
    font-weight: 650;
    margin-bottom: 0.4rem;
}
.conf-keynote-detail {
    font-size: 0.82rem;
    color: var(--text-secondary);
    font-style: italic;
}
.conf-papers {
    list-style: none;
    margin-bottom: 0.5rem;
    padding-left: 0;
}
.conf-papers li {
    padding: 0.25rem 0;
    display: flex;
    flex-direction: column;
}
.conf-paper-title {
    font-size: 0.85rem;
    font-weight: 500;
    font-style: italic;
    white-space: nowrap;
}
.conf-paper-authors {
    font-size: 0.78rem;
    color: var(--text-secondary);
}
.conf-papers .conf-paper-author-list {
    list-style: disc outside;
    margin: 0.1rem 0 0 1.2rem;
    padding: 0;
    font-size: 0.78rem;
    color: var(--text-secondary);
}
.conf-papers .conf-paper-author-list li {
    padding: 0;
    display: list-item;
    flex-direction: initial;
    line-height: 1.4;
    font-size: 0.78rem;
}
/* Panel author lists (not nested inside .conf-papers) */
.conf-session > .conf-paper-author-list {
    list-style: disc outside;
    font-size: 0.78rem;
    color: var(--text-secondary);
}
.conf-session > .conf-paper-author-list li {
    line-height: 1.4;
    font-size: 0.78rem;
}
.conf-paper-discussant {
    font-size: 0.78rem;
    color: var(--text-secondary);
    margin-top: 0.1rem;
}
.conf-awards .conf-paper-authors {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Conference video grid */
.conf-video-grid {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-top: 0.75rem;
}
.conf-video-item {
    max-width: 260px;
    flex: 1;
    min-width: 200px;
}
.conf-video-item .video-thumb {
    max-width: 100%;
}
.conf-video-label {
    font-size: 0.68rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
    line-height: 1.3;
}
.conf-panel-speakers {
    font-size: 0.82rem;
    color: var(--text-secondary);
}
.conf-external-video {
    display: inline-block;
    font-size: 0.78rem;
    font-weight: 500;
    color: #fff;
    text-decoration: none;
    background: #000;
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    transition: opacity 0.15s;
}
.conf-external-video:hover { opacity: 0.75; }

/* Footer */
footer {
    border-top: 1px solid var(--border);
    padding: 1.5rem 0;
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-light);
}
footer .container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}
.footer-icon {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    transition: opacity 0.15s;
}
.footer-icon:hover { opacity: 0.7; }
.footer-icon.x { color: #000; }
.footer-icon.youtube { color: #FF0000; }
.footer-icon.email { color: var(--text-light); }

/* Hamburger (hidden on desktop) */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    transition: transform 0.2s, opacity 0.2s;
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Responsive */
@media (max-width: 640px) {
    .hamburger { display: flex; }

    nav .container { position: relative; }
    nav .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        padding: 0.5rem 1.5rem 1rem;
    }
    nav .nav-links.open { display: flex; }

    nav .nav-links > a,
    .nav-dropdown-toggle {
        display: block;
        padding: 0.5rem 0;
        font-size: 0.95rem;
    }

    .nav-dropdown {
        flex-direction: column;
        align-items: flex-start;
    }
    .nav-dropdown-toggle { padding-bottom: 0.3rem; margin-bottom: 0; }
    .nav-dropdown-menu {
        display: block;
        position: static;
        border: none;
        box-shadow: none;
        padding: 0 0 0.25rem 1rem;
        white-space: normal;
    }
    .nav-dropdown-menu a {
        padding: 0.35rem 0;
        font-size: 0.85rem;
    }

    .hero-banner { padding: 2rem 0; }
    .hero-banner h1 { font-size: 1.6rem; }
    .hero-layout { flex-direction: column; gap: 1.5rem; align-items: flex-start; }
    .hero-event { min-width: 0; width: 100%; }
    .conference-info-grid { grid-template-columns: 1fr; }
    .speaker-grid { grid-template-columns: repeat(2, 1fr); }
    .sponsor-grid { grid-template-columns: 1fr; gap: 1.5rem; }
    .people-grid { grid-template-columns: 1fr; }
    .social-links { flex-direction: column; gap: 0.75rem; }
    .seminar-filters { top: 3.2rem; }
    .video-thumb { max-width: 100%; }
    .conf-year-grid { grid-template-columns: 1fr; }
    .conf-paper-title { white-space: normal; }
    .conf-awards .conf-paper-authors { white-space: normal; overflow: visible; text-overflow: clip; }
    .nav-subscribe-btn { margin-top: 0.25rem; padding: 0.45rem 1rem !important; font-size: 0.85rem !important; }
}

/* Subscribe button in nav */
.nav-subscribe-btn {
    background: #1a2332;
    color: #fff !important;
    padding: 0.3rem 0.85rem;
    border-radius: 4px;
    font-size: 0.78rem;
    font-weight: 600;
    text-decoration: none;
    transition: background 0.15s;
    white-space: nowrap;
    line-height: 1;
    align-self: flex-start;
}
.nav-subscribe-btn:hover { background: #22304a; }

/* Subscribe modal */
.subscribe-modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 1000;
    align-items: center;
    justify-content: center;
}
.subscribe-modal.active { display: flex; }
.subscribe-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.5);
}
.subscribe-modal-content {
    position: relative;
    background: #fff;
    border-radius: 8px;
    padding: 2.5rem 2rem;
    max-width: 420px;
    width: 90%;
    z-index: 1;
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}
.subscribe-modal-close {
    position: absolute;
    top: 0.75rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: #999;
    cursor: pointer;
    padding: 0;
    line-height: 1;
}
.subscribe-modal-close:hover { color: #333; }
.subscribe-modal-header {
    text-align: center;
    margin-bottom: 0.75rem;
}
.subscribe-modal-desc {
    text-align: center;
    font-size: 0.88rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.5;
}
.subscribe-form input {
    display: block;
    width: 100%;
    padding: 0.6rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.88rem;
    font-family: inherit;
    margin-bottom: 0.6rem;
    box-sizing: border-box;
}
.subscribe-form input:focus {
    outline: none;
    border-color: #3D7EC7;
}
.subscribe-form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.6rem;
}
.subscribe-form-row input { margin-bottom: 0; }
.subscribe-form-btn {
    display: block;
    width: 100%;
    padding: 0.65rem;
    background: #1a2332;
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 0.88rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    margin-top: 0.3rem;
    transition: background 0.15s;
}
.subscribe-form-btn:hover { background: #22304a; }
.subscribe-form-btn:disabled { opacity: 0.6; cursor: default; }
.subscribe-success p {
    text-align: center;
    font-size: 0.92rem;
    color: #2d6a4f;
    padding: 1rem 0;
}
.subscribe-error {
    text-align: center;
    font-size: 0.85rem;
    color: #c0392b;
    margin-top: 0.5rem;
}