:root {
  --ink: #071a33;
  --ink-soft: #173855;
  --paper: #f5f9fc;
  --white: #ffffff;
  --cyan: #2ed6e6;
  --cyan-pale: #ddf8fb;
  --indigo: #5667e8;
  --indigo-pale: #e9ebff;
  --signal: #ffb545;
  --slate: #617b91;
  --line: #cbd9e4;
  --soft-line: #e3ebf1;
  --shadow: 0 18px 55px rgba(7, 26, 51, 0.12);
  --max: 1240px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 20px;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "IBM Plex Sans", sans-serif;
  font-size: 16px;
  line-height: 1.45;
}

button,
input {
  font: inherit;
}

a {
  color: inherit;
}

[hidden] {
  display: none !important;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 9px 13px;
  background: var(--white);
  color: var(--ink);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.masthead,
.hero-grid,
.section-heading,
.program-grid,
.filter-deck,
.results-toolbar,
.paper-results,
footer {
  width: min(calc(100% - 48px), var(--max));
  margin-inline: auto;
}

.hero {
  background:
    radial-gradient(circle at 82% 0%, rgba(46, 214, 230, 0.12), transparent 33%),
    linear-gradient(135deg, #071a33, #0b2c4d);
  color: var(--white);
}

.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
}

.wordmark {
  display: inline-flex;
  gap: 8px;
  align-items: baseline;
  color: var(--white);
  font-family: "Archivo Black", sans-serif;
  font-size: 1rem;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.wordmark-year,
.footer-mark span {
  color: var(--cyan);
}

.conference-dates,
.eyebrow,
.section-index,
.filter-label,
.paper-number,
.event-time,
.format-tag,
kbd {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.055em;
  text-transform: uppercase;
}

.conference-dates {
  color: #b8ccdd;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(280px, 0.68fr) minmax(500px, 1.32fr);
  gap: clamp(32px, 6vw, 78px);
  align-items: start;
  padding: 34px 0 40px;
}

.hero-copy {
  padding-top: 8px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--cyan);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 14px;
  font-family: "Archivo Black", sans-serif;
  font-size: clamp(2.9rem, 5.3vw, 4.8rem);
  font-weight: 400;
  letter-spacing: -0.055em;
  line-height: 0.88;
  text-transform: uppercase;
}

h1 span {
  color: transparent;
  -webkit-text-stroke: 1.5px var(--cyan);
}

.hero-intro {
  max-width: 440px;
  margin-bottom: 20px;
  color: #c8d8e6;
  font-size: 0.98rem;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  color: #afc5d6;
  font-size: 0.78rem;
}

.hero-stats span {
  white-space: nowrap;
}

.hero-stats strong {
  color: var(--cyan);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.9rem;
}

.search-console {
  position: relative;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: var(--white);
  box-shadow: 0 18px 55px rgba(0, 0, 0, 0.2);
  color: var(--ink);
}

.search-console > label {
  display: block;
  margin: 0 0 8px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.045em;
  text-transform: uppercase;
}

.search-input-wrap {
  display: grid;
  grid-template-columns: 25px 1fr auto;
  gap: 11px;
  align-items: center;
  min-height: 58px;
  padding: 6px 14px;
  border: 2px solid var(--ink);
  background: var(--white);
  color: var(--ink);
  transition: border-color 140ms ease, box-shadow 140ms ease;
}

.search-input-wrap:focus-within {
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(46, 214, 230, 0.19);
}

.search-input-wrap svg {
  width: 24px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-width: 1.8;
}

.search-input-wrap input {
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
  font-size: 1.05rem;
}

.search-input-wrap input::placeholder {
  color: #6f8597;
  opacity: 1;
}

kbd {
  padding: 2px 6px;
  border: 1px solid var(--line);
  background: #edf4f8;
  color: var(--slate);
}

#search-hint {
  margin: 7px 0 0;
  color: var(--slate);
  font-size: 0.76rem;
}

#search-hint kbd {
  padding: 1px 4px;
  font-size: 0.62rem;
}

.search-preview {
  margin: 13px -16px -16px;
  border-top: 1px solid var(--line);
  background: #fbfdff;
}

.quick-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 39px;
  padding: 8px 16px;
  border-bottom: 1px solid var(--soft-line);
  font-size: 0.82rem;
}

.quick-summary strong {
  color: var(--indigo);
}

.quick-summary button {
  padding: 2px 0;
  border: 0;
  border-bottom: 1px solid currentColor;
  background: transparent;
  color: var(--slate);
  cursor: pointer;
  font-size: 0.76rem;
}

.quick-results {
  display: grid;
}

.quick-result {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(205px, 0.55fr);
  gap: 18px;
  align-items: center;
  min-height: 58px;
  padding: 9px 16px;
  border-bottom: 1px solid var(--soft-line);
  text-decoration: none;
}

.quick-result:hover,
.quick-result:focus-visible {
  background: var(--cyan-pale);
}

.quick-title {
  font-size: 0.87rem;
  font-weight: 600;
  line-height: 1.25;
}

.quick-time {
  color: var(--slate);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.65rem;
  line-height: 1.35;
}

.quick-all {
  display: block;
  padding: 10px 16px;
  color: var(--indigo);
  font-size: 0.8rem;
  font-weight: 600;
  text-align: right;
  text-decoration: none;
}

.quick-all:hover {
  text-decoration: underline;
}

.quick-empty {
  margin: 0;
  padding: 17px 16px 20px;
  color: var(--slate);
  font-size: 0.86rem;
}

.program-section,
.explorer-section {
  padding: 54px 0;
}

.program-section {
  background: var(--white);
}

.section-heading {
  display: flex;
  gap: 40px;
  align-items: end;
  justify-content: space-between;
  margin-bottom: 26px;
}

.section-heading > p {
  max-width: 390px;
  margin-bottom: 2px;
  color: var(--slate);
  font-size: 0.92rem;
}

.section-index {
  margin-bottom: 6px;
  color: var(--indigo);
}

h2 {
  margin-bottom: 0;
  font-family: "Archivo Black", sans-serif;
  font-size: clamp(1.75rem, 3vw, 2.55rem);
  font-weight: 400;
  letter-spacing: -0.04em;
  line-height: 1;
}

.program-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(245px, 1fr));
  gap: 13px;
  overflow-x: auto;
  padding-bottom: 7px;
}

.day-column {
  min-width: 245px;
  border-top: 3px solid var(--ink);
}

.day-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 12px 2px;
  border-bottom: 1px solid var(--line);
}

.day-heading h3 {
  margin: 0;
  font-size: 1rem;
}

.day-heading span {
  color: var(--slate);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.68rem;
}

.day-events {
  position: relative;
  padding-left: 16px;
}

.day-events::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 3px;
  width: 1px;
  background: var(--line);
  content: "";
}

.event-card {
  position: relative;
  width: 100%;
  padding: 10px 9px 10px 12px;
  border: 0;
  border-bottom: 1px solid var(--soft-line);
  background: transparent;
  color: var(--ink);
  text-align: left;
}

button.event-card {
  cursor: pointer;
}

.event-card::before {
  position: absolute;
  top: 16px;
  left: -16px;
  width: 8px;
  height: 8px;
  border: 2px solid var(--white);
  border-radius: 50%;
  background: var(--slate);
  box-shadow: 0 0 0 1px var(--line);
  content: "";
}

.event-card[data-kind="oral"]::before,
.event-card[data-kind="keynote"]::before {
  background: var(--indigo);
}

.event-card[data-kind="poster"]::before {
  background: var(--signal);
}

.event-card[data-kind="tutorial"] {
  background: rgba(255, 235, 138, 0.16);
}

.event-card[data-kind="tutorial"]::before {
  background: #d79a1f;
}

button.event-card:hover,
button.event-card:focus-visible {
  background: var(--cyan-pale);
  outline: none;
}

.detail-event {
  padding-right: 12px;
}

.detail-event summary {
  position: relative;
  padding-right: 18px;
  cursor: pointer;
  list-style: none;
}

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

.detail-event summary::after {
  position: absolute;
  top: 1px;
  right: 0;
  color: var(--indigo);
  content: "+";
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8rem;
  font-weight: 600;
}

.detail-event[open] {
  background: var(--cyan-pale);
}

.detail-event[open] summary::after {
  content: "−";
}

.event-disclosure {
  display: inline-block;
  margin-top: 6px;
  color: var(--indigo);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.57rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.event-expanded-copy {
  margin-top: 9px;
  padding-top: 9px;
  border-top: 1px solid var(--line);
}

.event-expanded-copy h4 {
  margin: 0 0 6px;
  font-size: 0.77rem;
  line-height: 1.3;
}

.event-expanded-copy p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.7rem;
  line-height: 1.48;
}

.event-presenters {
  margin-bottom: 8px;
  color: var(--ink-soft);
  font-size: 0.67rem;
  line-height: 1.4;
}

.event-presenters strong {
  display: block;
  margin-bottom: 3px;
  color: var(--ink);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.56rem;
  letter-spacing: 0.045em;
  text-transform: uppercase;
}

.event-presenters ul {
  display: grid;
  gap: 2px;
  margin: 0;
  padding-left: 15px;
}

.event-time {
  display: block;
  margin-bottom: 2px;
  color: var(--slate);
  font-size: 0.61rem;
}

.event-title {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  line-height: 1.25;
}

.event-detail {
  display: block;
  margin-top: 2px;
  color: var(--slate);
  font-size: 0.72rem;
  line-height: 1.3;
}

.explorer-section {
  background:
    linear-gradient(rgba(86, 103, 232, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(86, 103, 232, 0.03) 1px, transparent 1px),
    var(--paper);
  background-size: 32px 32px;
}

.filter-deck {
  padding: 13px 16px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.9);
}

.filter-row {
  display: grid;
  grid-template-columns: 68px 1fr;
  gap: 11px;
  align-items: start;
}

.filter-row + .filter-row {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--soft-line);
}

.filter-label {
  padding-top: 6px;
  color: var(--slate);
  font-size: 0.65rem;
}

.chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.chip {
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--white);
  color: var(--ink-soft);
  cursor: pointer;
  font-size: 0.76rem;
  font-weight: 500;
}

.chip:hover {
  border-color: var(--indigo);
}

.chip.is-active {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--white);
}

button:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 3px;
}

.results-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 22px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--ink);
}

.results-toolbar p {
  margin: 0;
  font-size: 0.94rem;
  font-weight: 600;
}

.text-button {
  padding: 3px 0;
  border: 0;
  border-bottom: 1px solid currentColor;
  background: transparent;
  color: var(--indigo);
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 600;
}

.paper-results {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.paper-card {
  display: grid;
  grid-template-columns: 105px minmax(0, 1fr) minmax(275px, 0.58fr);
  gap: 20px;
  align-items: start;
  padding: 17px 19px;
  border: 1px solid var(--line);
  border-left: 5px solid var(--indigo);
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 4px 18px rgba(7, 26, 51, 0.035);
  scroll-margin-top: 16px;
}

.paper-card.poster-only {
  border-left-color: var(--signal);
}

.paper-card:target {
  box-shadow: 0 0 0 4px rgba(46, 214, 230, 0.35), var(--shadow);
}

.paper-meta {
  display: grid;
  gap: 8px;
  justify-items: start;
}

.paper-number {
  color: var(--slate);
  font-size: 0.64rem;
}

.format-tag {
  padding: 3px 7px;
  background: var(--indigo-pale);
  color: #3546b5;
  font-size: 0.59rem;
}

.format-tag.poster {
  background: #fff0d5;
  color: #815200;
}

.paper-main {
  min-width: 0;
}

.paper-card h3 {
  margin-bottom: 5px;
  font-size: 1.02rem;
  line-height: 1.25;
}

.paper-card h3 a {
  text-decoration-color: transparent;
  text-underline-offset: 3px;
}

.paper-card h3 a:hover {
  text-decoration-color: var(--indigo);
}

.authors {
  margin-bottom: 5px;
  color: var(--ink-soft);
  font-size: 0.78rem;
}

.authors a {
  text-decoration-color: var(--line);
  text-underline-offset: 2px;
}

.authors-missing {
  color: var(--slate);
  font-style: italic;
}

.theme {
  margin-bottom: 0;
  color: var(--slate);
  font-size: 0.73rem;
  font-weight: 600;
}

.schedule-block {
  display: grid;
  gap: 8px;
  min-height: 100%;
  padding-left: 17px;
  border-left: 1px solid var(--soft-line);
}

.schedule-row {
  display: grid;
  grid-template-columns: 50px 1fr;
  gap: 7px;
  align-items: start;
}

.schedule-row strong {
  padding-top: 1px;
  color: var(--slate);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.6rem;
  letter-spacing: 0.035em;
  text-transform: uppercase;
}

.schedule-row span {
  font-size: 0.76rem;
  line-height: 1.35;
}

.paper-main details {
  margin-top: 8px;
}

.paper-main summary {
  width: fit-content;
  color: var(--indigo);
  cursor: pointer;
  font-size: 0.72rem;
  font-weight: 600;
}

.paper-main details p {
  margin: 8px 0 0;
  color: var(--ink-soft);
  font-size: 0.78rem;
}

mark {
  padding: 0 0.06em;
  background: #fff09b;
  color: inherit;
}

.empty-state,
.load-error {
  padding: 42px 20px;
  border: 1px dashed var(--line);
  background: var(--white);
  text-align: center;
}

.empty-state h3,
.load-error h3 {
  margin-bottom: 6px;
  font-size: 1.25rem;
}

.empty-state p,
.load-error p {
  margin-bottom: 0;
  color: var(--slate);
}

body.has-query .program-section,
body.has-query .explorer-heading,
body.has-query .filter-deck {
  display: none;
}

body.has-query .explorer-section {
  padding-top: 20px;
}

body.has-query .results-toolbar {
  margin-top: 0;
}

footer {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 28px;
  align-items: center;
  padding-top: 28px;
  padding-bottom: 34px;
  border-top: 1px solid var(--line);
  color: var(--slate);
  font-size: 0.78rem;
}

.footer-mark {
  color: var(--ink);
  font-family: "Archivo Black", sans-serif;
  font-size: 0.92rem;
  letter-spacing: 0.05em;
}

footer p {
  margin: 0;
}

footer a {
  color: var(--ink);
  font-weight: 600;
}

@media (max-width: 980px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .hero-copy {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 30px;
  }

  .hero-copy .eyebrow,
  .hero-copy h1 {
    grid-column: 1;
  }

  .hero-intro,
  .hero-stats {
    grid-column: 2;
  }

  .hero-intro {
    grid-row: 1 / span 2;
    align-self: end;
  }

  .hero-stats {
    align-self: start;
  }

  .program-grid {
    grid-template-columns: repeat(4, 275px);
  }

  .paper-card {
    grid-template-columns: 92px minmax(0, 1fr);
  }

  .schedule-block {
    grid-column: 2;
    min-height: auto;
    padding: 10px 0 0;
    border-top: 1px solid var(--soft-line);
    border-left: 0;
  }
}

@media (max-width: 640px) {
  .masthead,
  .hero-grid,
  .section-heading,
  .program-grid,
  .filter-deck,
  .results-toolbar,
  .paper-results,
  footer {
    width: min(calc(100% - 28px), var(--max));
  }

  .masthead {
    min-height: 55px;
  }

  .conference-dates {
    font-size: 0.58rem;
  }

  .hero-grid {
    gap: 20px;
    padding: 24px 0 28px;
  }

  .hero-copy {
    display: block;
  }

  h1 {
    font-size: clamp(2.65rem, 14vw, 4rem);
  }

  .hero-intro {
    margin-bottom: 15px;
  }

  .search-console {
    margin-inline: -2px;
    padding: 12px;
  }

  .search-input-wrap {
    grid-template-columns: 23px 1fr;
    min-height: 54px;
    padding-inline: 11px;
  }

  .search-input-wrap > kbd {
    display: none;
  }

  .search-preview {
    margin: 11px -12px -12px;
  }

  .quick-result {
    grid-template-columns: 1fr;
    gap: 4px;
    min-height: 62px;
    padding: 9px 12px;
  }

  .quick-summary,
  .quick-all {
    padding-inline: 12px;
  }

  .quick-time {
    font-size: 0.62rem;
  }

  .program-section,
  .explorer-section {
    padding: 40px 0;
  }

  .section-heading {
    display: block;
    margin-bottom: 20px;
  }

  .section-heading > p {
    margin: 12px 0 0;
  }

  .filter-deck {
    padding: 12px;
  }

  .filter-row {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .filter-label {
    padding-top: 0;
  }

  .session-filter-row {
    display: none;
  }

  .results-toolbar {
    align-items: start;
    gap: 10px;
  }

  .paper-card {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 15px;
  }

  .paper-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .schedule-block {
    grid-column: 1;
  }

  footer {
    grid-template-columns: 1fr;
    gap: 11px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}