/*=========================================================
    XAI4Science — NeurIPS 2026 edition
    Standalone theme layer. Loads after style.css/responsive.css
    and overrides them for this page only; the AAAI 2026 and
    ICLR 2025 archive pages are untouched.
==========================================================*/

:root {
    --ink: #10221e;
    --ink-soft: #46564f;
    --surface: #ffffff;
    --surface-sunken: #f4f7f5;
    --surface-raised: #ffffff;
    --border: #dce4e0;
    --border-strong: #c3cec8;
    --accent: #0e6b52;
    --accent-strong: #094a39;
    --accent-tint: #e6f0ec;
    --signal: #b5651d;
    --signal-text: #7a4009;
    --signal-tint: #f7ebe0;
    --focus-ring: rgba(14, 107, 82, 0.35);

    --font-display: 'Space Grotesk', 'Helvetica Neue', Arial, sans-serif;
    --font-body: 'Inter', 'Helvetica Neue', Arial, sans-serif;

    --shadow-sm: 0 1px 2px rgba(16, 34, 30, 0.06);
    --shadow-md: 0 6px 20px rgba(16, 34, 30, 0.08);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;

    --container-max: 1120px;
    --container-wide: clamp(1120px, 82vw, 1720px);
    --measure: 680px;
}

/* -----------------------------------------------------
   Base
------------------------------------------------------ */
body {
    font-family: var(--font-body);
    color: var(--ink-soft);
    background: var(--surface);
    height: auto;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    color: var(--ink);
    text-transform: none;
    letter-spacing: -0.01em;
}

p {
    font-family: var(--font-body);
    color: var(--ink-soft);
    line-height: 1.75;
}

a { color: var(--accent); }
a:hover { color: var(--accent-strong); }

.container {
    max-width: var(--container-wide);
    padding-left: 32px;
    padding-right: 32px;
}

.nav-container {
    max-width: var(--container-wide);
    padding-left: 32px;
    padding-right: 32px;
}

::selection {
    background: var(--accent-tint);
    color: var(--accent-strong);
}

a:focus-visible,
button:focus-visible,
.nav-link:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 2px;
}

/* -----------------------------------------------------
   Eyebrow / kicker labels
------------------------------------------------------ */
.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-body);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 14px;
}

.eyebrow::before {
    content: '';
    width: 18px;
    height: 2px;
    background: var(--accent);
    display: inline-block;
}

/* -----------------------------------------------------
   Navigation
------------------------------------------------------ */
.header {
    box-shadow: none;
    border-bottom: 1px solid var(--border);
}

.navbar {
    background-color: rgba(255, 255, 255, 0.92) !important;
    backdrop-filter: saturate(180%) blur(10px) !important;
    padding: 14px 0 !important;
}

.navbar::before,
.navbar::after {
    content: none;
}

.brand-mark {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.05rem;
    color: var(--ink) !important;
    letter-spacing: -0.01em;
    text-decoration: none !important;
    display: flex;
    align-items: center;
    gap: 8px;
}

.brand-mark .brand-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
    display: inline-block;
}

.navbar-nav .nav-link {
    color: var(--ink-soft) !important;
    font-family: var(--font-body);
    font-weight: 500;
    font-size: 0.94rem !important;
    margin-left: 4px;
    margin-right: 4px;
    padding: 8px 12px !important;
    border-radius: var(--radius-sm);
    transition: color 0.15s ease, background-color 0.15s ease !important;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    color: var(--accent-strong) !important;
    background-color: var(--accent-tint);
}

.navbar-nav .nav-link:hover::after,
.navbar-nav .nav-link.active::after {
    content: none;
}

.navbar-nav .nav-link.dropdown-toggle::after {
    display: none;
}

.navbar-nav .nav-link.nav-cta {
    background: var(--accent);
    color: #fff !important;
    font-weight: 600 !important;
    padding: 9px 18px !important;
    margin-left: 12px;
}

.navbar-nav .nav-link.nav-cta:hover {
    background: var(--accent-strong);
    color: #fff !important;
}

.dropdown-menu {
    position: absolute !important;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    padding: 6px;
}

.dropdown-menu .nav-link {
    border-radius: var(--radius-sm);
}

/* Bootstrap's click-toggle JS already opens/closes this menu correctly
   (toggling the .show class); style.css's hover-to-open rule fights it,
   so its display:none-while-hovered behavior is overridden here. */
.dropdown:hover .dropdown-menu:not(.show) {
    display: none !important;
}

/* -----------------------------------------------------
   Hero
------------------------------------------------------ */
.welcome-hero {
    position: relative;
    background: linear-gradient(180deg, var(--surface-sunken) 0%, var(--surface) 100%);
    margin-top: 0;
    padding-top: 132px;
    padding-bottom: 72px;
    overflow: hidden;
}

.welcome-hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20viewBox%3D%220%200%201600%20500%22%20preserveAspectRatio%3D%22xMidYMid%20slice%22%3E%0A%3Cpath%20d%3D%22M-50%2C120%20C%20250%2C60%20450%2C180%20750%2C110%20S%201250%2C40%201650%2C130%22%20fill%3D%22none%22%20stroke%3D%22%230e6b52%22%20stroke-opacity%3D%220.55%22%20stroke-width%3D%221.5%22/%3E%0A%3Cpath%20d%3D%22M-50%2C180%20C%20250%2C120%20450%2C240%20750%2C170%20S%201250%2C100%201650%2C190%22%20fill%3D%22none%22%20stroke%3D%22%230e6b52%22%20stroke-opacity%3D%220.48%22%20stroke-width%3D%221.5%22/%3E%0A%3Cpath%20d%3D%22M-50%2C240%20C%20250%2C180%20450%2C300%20750%2C230%20S%201250%2C160%201650%2C250%22%20fill%3D%22none%22%20stroke%3D%22%230e6b52%22%20stroke-opacity%3D%220.40%22%20stroke-width%3D%221.5%22/%3E%0A%3Cpath%20d%3D%22M-50%2C300%20C%20250%2C240%20450%2C360%20750%2C290%20S%201250%2C220%201650%2C310%22%20fill%3D%22none%22%20stroke%3D%22%230e6b52%22%20stroke-opacity%3D%220.30%22%20stroke-width%3D%221.5%22/%3E%0A%3Cpath%20d%3D%22M-50%2C360%20C%20250%2C300%20450%2C420%20750%2C350%20S%201250%2C280%201650%2C370%22%20fill%3D%22none%22%20stroke%3D%22%230e6b52%22%20stroke-opacity%3D%220.20%22%20stroke-width%3D%221.5%22/%3E%0A%3Ccircle%20cx%3D%221180%22%20cy%3D%22150%22%20r%3D%223%22%20fill%3D%22%230e6b52%22%20fill-opacity%3D%220.6%22/%3E%0A%3Ccircle%20cx%3D%22420%22%20cy%3D%22210%22%20r%3D%223%22%20fill%3D%22%230e6b52%22%20fill-opacity%3D%220.5%22/%3E%0A%3Ccircle%20cx%3D%22850%22%20cy%3D%2290%22%20r%3D%223%22%20fill%3D%22%230e6b52%22%20fill-opacity%3D%220.45%22/%3E%0A%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: top center;
    background-size: cover;
    mask-image: linear-gradient(180deg, rgba(0,0,0,0.5) 0%, rgba(0,0,0,0.35) 70%, transparent 100%);
    -webkit-mask-image: linear-gradient(180deg, rgba(0,0,0,0.5) 0%, rgba(0,0,0,0.35) 70%, transparent 100%);
    pointer-events: none;
}

.hero-shell {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 28px;
    text-align: center;
    max-width: 860px;
    margin: 0 auto;
}

.header-text {
    gap: 20px;
    padding: 0;
}

.header-text h2 {
    font-size: 46px;
    font-weight: 600;
    line-height: 1.28;
    text-wrap: balance;
    margin-top: 0;
    color: var(--ink);
}

.header-text h2 span { color: var(--accent); }

.hero-meta {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px 12px;
}

.hero-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14.5px;
    font-weight: 500;
    color: var(--ink-soft);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 8px 16px;
}

.hero-pill i { color: var(--accent); }

.hero-tagline {
    font-family: var(--font-display);
    font-size: 19px;
    font-weight: 500;
    color: var(--ink);
    font-style: normal;
    text-align: center;
    margin: 0 auto;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    width: 100%;
}

/* -----------------------------------------------------
   Section rhythm
------------------------------------------------------ */
section[id] {
    scroll-margin-top: 88px;
}

.section-band {
    padding: 76px 0;
}

.section-band + .section-band {
    border-top: 1px solid var(--border);
}

.section-band-sunken {
    background: var(--surface-sunken);
}

/* Two-column layout for text-heavy sections (About, Submissions) so the
   heading anchors a left rail instead of stacking above a narrow, isolated
   prose column on wide screens. */
.section-split {
    display: block;
}

@media (min-width: 1100px) {
    .section-split {
        display: grid;
        grid-template-columns: 320px 1fr;
        gap: 64px;
        align-items: start;
    }

    .section-split-heading {
        position: sticky;
        top: 110px;
        margin-bottom: 0;
        max-width: none;
    }

    .section-split-body {
        max-width: var(--measure);
    }
}

.content-col {
    max-width: var(--measure);
    margin: 0;
}

.content-col-wide {
    max-width: none;
}

.section-heading {
    align-items: flex-start;
    margin-bottom: 36px;
    max-width: 640px;
}

.section-heading h3 {
    font-size: 30px;
    font-weight: 600;
    margin-bottom: 6px;
}

.section-heading .separator-div {
    display: none;
}

.section-heading p.section-lede {
    color: var(--ink-soft);
    font-size: 16px;
    margin-top: 8px;
}

.prose p {
    text-align: left;
    font-size: 16.5px;
}

.prose p + p {
    margin-top: 18px;
}

/* -----------------------------------------------------
   Topics: focus list
------------------------------------------------------ */
.focus-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin: 28px 0 0;
    padding: 0;
    list-style: none;
}

.focus-list li {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 20px 22px;
    font-size: 15px;
    color: var(--ink-soft);
    margin: 0;
    line-height: 1.6;
}

.focus-list .focus-tag {
    display: block;
    font-family: var(--font-display);
    font-weight: 600;
    color: var(--ink);
    font-size: 15px;
    margin-bottom: 6px;
}

/* -----------------------------------------------------
   Speaker cards
------------------------------------------------------ */
.speaker-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-top: 36px;
}

.speaker-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 14px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    height: 100%;
    transition: border-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}

.speaker-card:hover {
    border-color: var(--border-strong);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.speaker-card-index {
    font-family: var(--font-display);
    font-size: 13px;
    font-weight: 600;
    color: var(--accent);
    letter-spacing: 0.04em;
}

.speaker-card h6 {
    font-size: 19px;
    font-weight: 600;
    margin: 0;
}

.speaker-card .speaker-affiliation {
    font-size: 14px;
    color: var(--ink-soft);
    margin: 2px 0 0;
}

.tentative-tag {
    font-size: 13px;
    font-weight: 400;
    color: var(--ink-soft);
}

.speaker-card a.stretched-link::after {
    content: '';
    position: absolute;
    inset: 0;
}

.speaker-card {
    position: relative;
}

/* -----------------------------------------------------
   Schedule
------------------------------------------------------ */
.schedule-table-wrap {
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--surface);
}

.schedule-table-wrap .table {
    margin-top: 0;
}

.schedule-table-wrap .table th,
.schedule-table-wrap .table td {
    padding: 15px 20px;
    font-size: 15px;
}

.schedule-table-wrap thead th {
    background: var(--ink) !important;
    color: #fff;
    font-family: var(--font-display);
    font-weight: 500;
    font-size: 12.5px;
    text-transform: uppercase;
    letter-spacing: 0.07em;
}

.schedule-table-wrap tbody tr {
    background: var(--surface) !important;
    border-bottom: 1px solid var(--border);
}

.schedule-table-wrap tbody tr:last-child {
    border-bottom: none;
}

.schedule-table-wrap td:first-child {
    font-variant-numeric: tabular-nums;
    color: var(--ink-soft);
    white-space: nowrap;
    font-size: 14.5px;
}

.schedule-break-row td {
    background: var(--surface-sunken) !important;
    font-family: var(--font-display);
    font-weight: 500;
    font-size: 12.5px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--ink-soft);
}

.schedule-tag {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 2px 8px;
    border-radius: 999px;
    background: var(--accent-tint);
    color: var(--accent-strong);
    margin-right: 8px;
    vertical-align: middle;
}

.schedule-tag.is-break {
    background: var(--signal-tint);
    color: var(--signal-text);
}

/* -----------------------------------------------------
   Call for submissions — accordion
------------------------------------------------------ */
.cfs-accordion .accordion-item {
    border: 1px solid var(--border);
    border-radius: var(--radius-md) !important;
    margin-bottom: 12px;
    overflow: hidden;
}

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

.cfs-accordion .accordion-button {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: 16px;
    color: var(--ink);
    background: var(--surface);
    padding: 18px 22px;
}

.cfs-accordion .accordion-button:not(.collapsed) {
    background: var(--accent-tint);
    color: var(--accent-strong);
    box-shadow: none;
}

.cfs-accordion .accordion-button:focus {
    box-shadow: 0 0 0 3px var(--focus-ring);
}

.cfs-accordion .accordion-button::after {
    filter: hue-rotate(100deg) saturate(0.6);
}

.cfs-accordion .accordion-body {
    padding: 6px 22px 20px;
    font-size: 15.5px;
    color: var(--ink-soft);
    text-align: left;
}

.cfs-accordion .accordion-body p { margin-bottom: 10px; }
.cfs-accordion .accordion-body p:last-child { margin-bottom: 0; }

.dates-table-wrap {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.dates-table-wrap .table {
    margin-top: 0;
}

.dates-table-wrap .table td {
    padding: 14px 20px;
    font-size: 15px;
}

.dates-table-wrap .table tbody tr:nth-of-type(odd) {
    background-color: var(--surface-sunken) !important;
}

.dates-note {
    font-size: 13.5px;
    color: var(--ink-soft);
    margin-bottom: 14px;
}

/* -----------------------------------------------------
   Organizers & committee
------------------------------------------------------ */
.people-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    margin-top: 8px;
}

.person-card {
    text-align: center;
}

.person-card img {
    width: 132px;
    height: 132px;
    border-radius: 50%;
    object-fit: cover;
    object-position: center top;
    border: 1px solid var(--border);
    margin-bottom: 14px;
    transition: box-shadow 0.2s ease;
}

.person-card:hover img {
    box-shadow: 0 0 0 4px var(--accent-tint);
}

.person-card h6 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 2px;
}

.person-card p {
    font-size: 13.5px;
    color: var(--ink-soft);
}

.committee-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-top: 8px;
}

.committee-chip {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    font-size: 14.5px;
    color: var(--ink);
    font-weight: 500;
}

.committee-chip .chip-status {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--signal-text);
    white-space: nowrap;
}

/* -----------------------------------------------------
   Modals
------------------------------------------------------ */
.modal-content {
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
}

.modal-header {
    border-bottom: none;
    padding-bottom: 0;
}

.modal-header h6 {
    font-size: 22px;
    font-weight: 600;
}

.modal-body b {
    color: var(--ink);
    font-weight: 600;
}

/* -----------------------------------------------------
   Footer
------------------------------------------------------ */
.footer-copyright {
    background: var(--ink);
    padding: 48px 0 24px;
}

.footer-copyright h5 {
    color: #fff;
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.footer-copyright p,
.footer-copyright .link2 {
    color: rgba(255, 255, 255, 0.7);
}

.footer-copyright .link2:hover {
    color: #fff;
}

.hm-foot-icon ul li a {
    color: rgba(255, 255, 255, 0.7);
}

.hm-foot-icon ul li a:hover {
    color: #fff;
}

.footer-copyright .container > .row:first-child {
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    padding-bottom: 28px;
    margin-bottom: 20px;
}

.hm-footer-copyright p {
    color: rgba(255, 255, 255, 0.45);
    font-size: 13.5px;
}

/* -----------------------------------------------------
   Buttons
------------------------------------------------------ */
.btn-custom {
    background-color: var(--accent) !important;
    border: 1px solid var(--accent) !important;
    border-radius: var(--radius-sm) !important;
    font-weight: 600 !important;
}

.btn-custom:hover {
    background-color: var(--accent-strong) !important;
    border-color: var(--accent-strong) !important;
}

.btn-outline-formal {
    background: transparent !important;
    color: var(--accent) !important;
    border: 1px solid var(--border-strong) !important;
    border-radius: var(--radius-sm) !important;
    font-weight: 600 !important;
    padding: 10px 20px !important;
}

.btn-outline-formal:hover {
    background: var(--accent-tint) !important;
    border-color: var(--accent) !important;
}

.link, .link2 {
    color: var(--accent);
    font-weight: 500;
}

.link:hover, .link2:hover {
    color: var(--accent-strong);
}

.span-highlight {
    color: var(--accent);
}

.separator-div {
    background-color: var(--accent);
}

/* -----------------------------------------------------
   Responsive
------------------------------------------------------ */
@media (max-width: 992px) {
    .header-text h2 { font-size: 38px; }
    .focus-list { grid-template-columns: repeat(2, 1fr); }
    .speaker-grid { grid-template-columns: 1fr; }
    .people-grid { grid-template-columns: repeat(2, 1fr); }
    .committee-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .welcome-hero { padding-top: 112px; }
    .header-text h2 { font-size: 32px; }
    .section-band { padding: 56px 0; }
    .focus-list { grid-template-columns: 1fr; }
    .schedule-table-wrap {
        overflow-x: auto;
        position: relative;
        background-image: linear-gradient(to left, var(--surface) 0%, transparent 24px);
        background-repeat: no-repeat;
        background-position: 100% 0;
        background-size: 32px 100%;
    }
    .schedule-table-wrap .table { min-width: 560px; }
}

@media (max-width: 576px) {
    .people-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
    .committee-grid { grid-template-columns: 1fr; }
    .hero-pill { font-size: 13px; padding: 7px 12px; }
}