:root {
  --navy: #08245e;
  --navy-deep: #041d4c;
  --blue: #087df4;
  --cyan: #18c8ef;
  --green: #35bd78;
  --orange: #ff8a2b;
  --purple: #7548f5;
  --ink: #0a245c;
  --muted: #64728d;
  --line: #dfe7f1;
  --page: min(1280px, calc(100vw - 72px));
  --hero-page: min(1400px, calc(100vw - 72px));
  --radius: 8px;
  --shadow: 0 20px 60px rgba(6, 35, 85, 0.13);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-x: hidden;
  color: var(--muted);
  background: #fff;
  font-family: "Inter", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.58;
  -webkit-font-smoothing: antialiased;
}
body.modal-open { overflow: hidden; }
button, a { font: inherit; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
figure, h1, h2, h3, p { margin: 0; }
.page-shell { width: var(--page); margin-inline: auto; }

.hero {
  position: relative;
  height: clamp(630px, 89.73svh, 900px);
  min-height: 630px;
  color: #fff;
  background: url("assets/images/ai-energy-hero-v21.webp") center 48% / cover no-repeat;
  isolation: isolate;
}
.hero-shade {
  position: absolute;
  z-index: -1;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(3, 25, 75, 0.78) 0%, rgba(3, 30, 82, 0.5) 42%, rgba(2, 29, 73, 0.12) 74%),
    linear-gradient(0deg, rgba(2, 20, 57, 0.38), transparent 45%);
}
.topbar {
  position: absolute;
  z-index: 20;
  top: 24px;
  left: 50%;
  width: min(1480px, calc(100vw - 64px));
  min-height: 116px;
  padding: 12px 18px;
  display: grid;
  grid-template-columns: 248px minmax(0, 1fr) 248px;
  align-items: center;
  gap: 22px;
  color: var(--navy);
  background: #fbfdff;
  border: 1px solid rgba(216, 226, 240, 0.86);
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(8, 36, 80, 0.1);
  transform: translateX(-50%);
  backdrop-filter: blur(16px);
}
.brand { width: 248px; min-width: 0; display: flex; align-items: center; justify-self: start; }
.brand img { width: 248px; height: auto; max-height: 72px; object-fit: contain; object-position: left center; }
.brand-copy { display: grid; line-height: 1; }
.brand-copy strong {
  color: #092664;
  font-family: "Roboto Condensed", sans-serif;
  font-size: 25px;
  font-weight: 800;
  letter-spacing: -0.035em;
}
.brand-copy em { color: var(--blue); font-style: normal; }
.brand-copy small {
  margin-top: 5px;
  color: #54637b;
  font-size: 7px;
  font-weight: 800;
  letter-spacing: 0.25em;
}
.main-menu {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  min-width: 0;
}
.nav-group { position: relative; display: flex; align-items: center; }
.nav-link {
  position: relative;
  min-height: 58px;
  display: flex;
  align-items: center;
  gap: 6px;
  padding-inline: 2px;
  color: #07194d;
  font-family: "Barlow Condensed", "Roboto Condensed", "Arial Narrow", sans-serif;
  font-size: clamp(15px, 1.05vw, 16px);
  font-weight: 700;
  letter-spacing: 0;
  border-radius: 6px;
  white-space: nowrap;
  transition: color 180ms ease;
}
.nav-parent {
  appearance: none;
  background: transparent;
  border: 0;
  cursor: pointer;
}
.nav-link i { color: #6f7f98; font-size: 9px; transition: transform 180ms ease; }
.nav-link::after {
  position: absolute;
  right: 50%;
  bottom: 1px;
  left: 50%;
  height: 2px;
  content: "";
  background: var(--blue);
  border-radius: 999px;
  transform-origin: center;
  transition: right 180ms ease, left 180ms ease;
}
.nav-link:hover { color: #0865ff; background: transparent; }
.nav-link.active { color: #0865ff; background: transparent; }
.nav-link:hover::after, .nav-link.active::after, .nav-group.open > .nav-parent::after { right: 4px; left: 4px; }
.nav-group.open > .nav-parent { color: #0865ff; }
.nav-link:hover i, .nav-group.open > .nav-parent i { transform: rotate(180deg); }
.submenu {
  position: absolute;
  z-index: 40;
  top: calc(100% - 3px);
  left: 50%;
  width: max-content;
  min-width: 210px;
  padding: 10px;
  display: grid;
  gap: 0;
  background: rgba(255, 255, 255, 0.98);
  border: 0;
  border-radius: 12px;
  box-shadow: 0 18px 45px rgba(12, 31, 52, 0.18);
  opacity: 0;
  visibility: hidden;
  transform: translate(-50%, 8px);
  pointer-events: none;
  transition: opacity 160ms ease, transform 160ms ease, visibility 160ms ease;
}
.submenu-right { right: -4px; left: auto; transform: translateY(8px); }
.submenu a {
  min-height: 39px;
  padding: 10px 13px;
  display: flex;
  align-items: center;
  color: #24344a;
  font-size: 12px;
  font-weight: 700;
  border-radius: 8px;
  white-space: nowrap;
  transition: color 160ms ease, background-color 160ms ease, padding-left 160ms ease;
}
.submenu a::before { display: none; }
.submenu a:hover, .submenu a:focus-visible { padding-left: 17px; color: #0865ff; background: #f1f6fb; }
.nav-group:hover > .submenu,
.nav-group:focus-within > .submenu,
.nav-group.open > .submenu {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
  pointer-events: auto;
}
.nav-group:hover > .submenu-right,
.nav-group:focus-within > .submenu-right,
.nav-group.open > .submenu-right { transform: translateY(0); }
.mobile-menu-actions { display: none; }
.nav-actions { display: flex; align-items: center; justify-self: end; gap: 10px; margin-left: 0; }
.language-switch, .submit-button {
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}
.language-switch {
  min-width: 78px;
  height: 44px;
  color: var(--navy);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid #d5dfeb;
  cursor: pointer;
}
.submit-button {
  gap: 12px;
  padding-inline: 20px;
  color: #fff;
  background: var(--blue);
  box-shadow: 0 8px 18px rgba(8, 101, 255, 0.2);
}
.language-switch:hover { background: #f3f7fc; }
.submit-button:hover, .primary-button:hover { background: #006dde; transform: translateY(-2px); }
.nav-toggle { display: none; }

.hero-content { position: relative; width: var(--hero-page); height: 100%; padding-top: 210px; }
.eyebrow {
  color: rgba(255, 255, 255, 0.94);
  font-size: 22px;
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: -0.02em;
}
.hero h1 {
  max-width: 950px;
  margin-top: 10px;
  color: #fff;
  font-size: clamp(44px, 2.59vw, 58px);
  font-weight: 800;
  line-height: 1.07;
  letter-spacing: -0.045em;
  text-wrap: balance;
  text-shadow: 0 3px 20px rgba(4, 22, 64, 0.18);
}
.conference-name {
  margin-top: 10px;
  color: #fff;
  font-family: "Oswald", "Roboto Condensed", sans-serif;
  font-size: clamp(82px, 5.96vw, 122px);
  font-weight: 700;
  line-height: 1.07;
  letter-spacing: -0.055em;
  text-transform: uppercase;
  text-shadow: 0 6px 24px rgba(4, 22, 64, 0.26);
}
.conference-name span { color: #17c6ef; }
.hero-meta { margin-top: 18px; display: flex; gap: 30px; color: rgba(255, 255, 255, 0.96); font-size: 20px; }
.hero-meta span { display: inline-flex; align-items: center; gap: 9px; }
.hero-meta i { font-size: 20px; }
.hero-actions { margin-top: 28px; display: flex; align-items: center; gap: 18px; }
.hero-action {
  height: 54px;
  padding-inline: 27px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: 7px;
  font-size: 15px;
  font-weight: 700;
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}
.hero-action-primary { min-width: 191px; background: #087df4; border-color: #087df4; box-shadow: 0 12px 28px rgba(0, 91, 242, 0.3); }
.hero-action-ghost { min-width: 240px; background: rgba(4, 30, 78, 0.36); backdrop-filter: blur(7px); }
.hero-action:hover { transform: translateY(-2px); }
.hero-action-primary:hover { background: #006fe6; border-color: #006fe6; }
.hero-action-ghost:hover { background: rgba(8, 47, 105, 0.65); border-color: rgba(255, 255, 255, 0.82); }
.countdown {
  width: 540px;
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}
.countdown > div {
  width: auto;
  height: 82px;
  display: grid;
  align-content: center;
  justify-items: center;
  background: rgba(4, 26, 69, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: 7px;
  box-shadow: inset 0 1px rgba(255, 255, 255, 0.1), 0 8px 24px rgba(2, 17, 52, 0.18);
  backdrop-filter: blur(7px);
}
.countdown strong { color: #fff; font-family: "Roboto Condensed", sans-serif; font-size: 37px; font-weight: 800; line-height: 1; }
.countdown span { margin-top: 5px; color: #fff; font-size: 9px; font-weight: 700; letter-spacing: 0.07em; }
.countdown-caption {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 10px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 11px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.countdown-caption::before { width: 32px; height: 1px; content: ""; background: rgba(255, 255, 255, 0.45); }
.hero-note {
  position: absolute;
  right: 8px;
  bottom: 57px;
  display: grid;
  color: #fff;
  text-align: left;
  transform: rotate(-4deg);
  text-shadow: 0 3px 14px rgba(0, 17, 48, 0.5);
}
.hero-note strong { font-family: "Caveat", cursive; font-size: 54px; font-weight: 600; line-height: 0.92; }
.hero-note span { margin-left: 28px; font-family: "Caveat", cursive; font-size: 22px; font-weight: 600; line-height: 1.04; }
.energy-orbits { display: none; }

.announcement-strip {
  position: relative;
  z-index: 8;
  width: var(--hero-page);
  min-height: 119px;
  margin-top: -42px;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  overflow: hidden;
  background: rgba(255, 255, 255, 0.98);
  border-radius: 12px;
  box-shadow: var(--shadow);
}
.announcement-item, .important-link {
  position: relative;
  min-width: 0;
  min-height: 119px;
  padding: 16px 18px;
  display: flex;
  align-items: center;
  gap: 15px;
  border-right: 1px solid var(--line);
}
.announcement-item > i, .important-link > i:first-child {
  width: 47px;
  height: 47px;
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  color: var(--blue);
  background: #eaf4ff;
  border-radius: 50%;
  font-size: 20px;
}
.announcement-item:nth-child(1) > i { color: #f05b5b; background: #fff0f0; }
.announcement-item:nth-child(3) > i { color: #20b968; background: #e8f8ef; }
.announcement-item:nth-child(4) > i { color: #7e4df4; background: #f0ebff; }
.announcement-item:nth-child(5) > i { color: #087df4; background: #eaf4ff; }
.announcement-item span { min-width: 0; display: grid; line-height: 1.35; }
.announcement-item strong, .important-link strong { color: #134c9b; font-size: 15px; font-weight: 700; }
.announcement-item small { color: #8090a7; font-size: 11px; }
.announcement-item:hover { background: #f8fbff; }
.announcement-item:last-child { border-right: 0; }
.important-link { justify-content: center; border-right: 0; }
.important-link > i:first-child { color: #7e4df4; background: #f0ebff; }
.important-link > i:last-child { margin-left: auto; color: var(--blue); }

.section { padding-top: 54px; }
.section-kicker {
  margin-bottom: 7px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: #75b5f4;
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.12em;
  line-height: 1;
}
.section-kicker::before { width: 28px; height: 2px; content: ""; background: var(--blue); }
.section-kicker i { font-size: 8px; }
.section-title {
  color: var(--ink);
  font-family: "Roboto Condensed", "Inter", sans-serif;
  font-size: clamp(31px, 2.4vw, 42px);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -0.035em;
}
.section-heading-row { margin-bottom: 24px; display: flex; align-items: end; justify-content: space-between; gap: 24px; }
.section-heading-row > a { padding-bottom: 4px; color: var(--blue); font-size: 11px; font-weight: 700; }
.section-heading-row > a i { margin-left: 5px; }

.overview-section {
  padding-top: 48px;
  padding-bottom: 8px;
  display: grid;
  grid-template-columns: 1fr 0.95fr;
  gap: 55px;
  align-items: center;
}
.overview-copy p, .call-copy p, .venue-copy p { margin-top: 20px; color: #65738c; font-size: 15px; line-height: 1.62; }
.primary-button, .secondary-button {
  min-height: 48px;
  padding: 0 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 13px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 700;
  transition: background 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}
.primary-button { color: #fff; background: var(--blue); border: 1px solid var(--blue); box-shadow: 0 9px 22px rgba(8, 125, 244, 0.22); }
.secondary-button { color: var(--blue); background: rgba(255, 255, 255, 0.84); border: 1px solid var(--blue); }
button.primary-button { cursor: pointer; }
.overview-copy .primary-button, .venue-copy .primary-button { margin-top: 22px; }
.city-card, .travel-card { position: relative; overflow: hidden; border-radius: var(--radius); }
.city-card { height: 306px; min-height: 306px; background: #d7e6f3; box-shadow: 0 12px 32px rgba(8, 47, 102, 0.12); }
.city-card img, .travel-card img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.city-card figcaption {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  padding: 42px 24px 18px;
  display: flex;
  align-items: center;
  gap: 13px;
  color: #fff;
  background: linear-gradient(0deg, rgba(2, 22, 57, 0.94), transparent);
}
.city-card figcaption i { font-size: 26px; }
.city-card figcaption span { display: grid; line-height: 1.25; }
.city-card figcaption strong { font-size: 16px; }
.city-card figcaption small { font-size: 11px; }

#topics { padding-top: 48px; }
.topic-grid {
  counter-reset: topic;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.topic-card {
  position: relative;
  min-height: 170px;
  padding: 56px 22px 25px 78px;
  display: block;
  counter-increment: topic;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.topic-card:nth-child(4n) { border-right: 0; }
.topic-card:nth-child(n + 5) { border-bottom: 0; }
.topic-card::before {
  position: absolute;
  top: 6px;
  left: 12px;
  content: counter(topic, decimal-leading-zero);
  color: #c6dcf3;
  font-family: "Roboto Condensed", sans-serif;
  font-size: 40px;
  font-weight: 800;
  letter-spacing: -0.04em;
}
.topic-card > i { position: absolute; top: 58px; left: 16px; color: var(--blue); font-size: 31px; }
.topic-card.accent-orange > i { color: var(--orange); }
.topic-card.accent-purple > i { color: var(--purple); }
.topic-card h3, .publication-grid h3, .person-card h3, .news-grid h3 { color: #0b2d6b; font-weight: 700; line-height: 1.25; }
.topic-card h3 { font-size: 15px; }
.person-card h3, .publication-grid h3, .news-grid h3 { font-size: 14px; }
.topic-card p, .publication-grid p, .person-card p, .news-grid p { margin-top: 7px; color: #718099; line-height: 1.4; }
.topic-card p, .news-grid p { font-size: 11px; }
.publication-grid p, .person-card p { font-size: 10.5px; }

.dates-section { padding-top: 36px; padding-bottom: 36px; }
.timeline { position: relative; padding-top: 2px; display: grid; grid-template-columns: repeat(5, 1fr); text-align: center; }
.timeline::before { position: absolute; top: 8px; right: 6%; left: 6%; height: 2px; content: ""; background: #92c4f5; }
.timeline-item { position: relative; z-index: 1; display: grid; justify-items: center; }
.timeline-item > span {
  width: 15px;
  height: 15px;
  margin-bottom: 10px;
  background: var(--blue);
  border: 3px solid #fff;
  border-radius: 50%;
  box-shadow: 0 0 0 2px var(--blue);
}
.timeline-item.green > span { background: var(--green); box-shadow: 0 0 0 2px var(--green); }
.timeline-item.orange > span { background: var(--orange); box-shadow: 0 0 0 2px var(--orange); }
.timeline-item strong { color: #0874ed; font-size: 12px; }
.timeline-item small { margin-top: 2px; color: #52617c; font-size: 11px; }

.call-section {
  min-height: 285px;
  background:
    linear-gradient(90deg, #eaf5ff 0%, rgba(235, 246, 255, 0.97) 42%, rgba(235, 246, 255, 0.24) 67%, rgba(235, 246, 255, 0.04) 100%),
    url("assets/images/ai-energy-hero-v21.webp") center right / cover no-repeat;
}
.call-inner { min-height: 285px; padding-block: 36px; display: flex; align-items: center; }
.call-copy { width: 55%; }
.call-copy p { margin-top: 16px; max-width: 690px; }
.button-row { margin-top: 20px; display: flex; gap: 14px; }

#committee { padding-top: 38px; }
.committee-grid, .publication-grid, .news-grid { display: grid; gap: 14px; }
.committee-grid, .publication-grid { grid-template-columns: repeat(4, 1fr); }
.person-card {
  min-height: 132px;
  padding: 13px;
  display: flex;
  align-items: center;
  gap: 15px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 7px;
  transition: transform 180ms ease, box-shadow 180ms ease;
}
.person-card:hover, .news-grid article:hover { transform: translateY(-3px); box-shadow: 0 12px 30px rgba(9, 47, 102, 0.1); }
.person-card img {
  width: 88px;
  aspect-ratio: 0.84;
  flex: 0 0 auto;
  object-fit: cover;
  object-position: top center;
  background: #edf2f6;
  border-radius: 6px;
}
.person-card small { color: var(--blue); font-size: 10px; font-weight: 700; }
.person-card p { margin-top: 5px; }

.publication-section { padding-top: 30px; }
.publication-section .section-title { margin-bottom: 22px; }
.publication-grid article {
  min-height: 105px;
  padding: 18px;
  display: flex;
  align-items: center;
  gap: 15px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 7px;
}
.publication-grid article > i { width: 52px; height: 52px; display: grid; flex: 0 0 auto; place-items: center; border-radius: 50%; font-size: 22px; }
.pink { color: #ff5071; background: #ffebef; }
.green-bg { color: #18b86c; background: #e7f9ef; }
.purple { color: #7245ef; background: #efeaff; }
.blue-bg { color: #0877f9; background: #e8f3ff; }

.venue-section {
  padding-top: 35px;
  display: grid;
  grid-template-columns: 1.06fr 0.98fr 0.54fr 0.54fr;
  gap: 14px;
  align-items: stretch;
}
.venue-copy { padding-right: 34px; }
.venue-copy p { margin-top: 16px; font-size: 13px; }
.venue-copy .primary-button { margin-top: 17px; }
.travel-card { min-height: 220px; background: #dce7f2; box-shadow: 0 8px 24px rgba(9, 45, 94, 0.08); }
.travel-card figcaption {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  min-height: 62px;
  padding: 11px 12px;
  display: grid;
  align-content: center;
  background: rgba(255, 255, 255, 0.96);
}
.travel-card.wide figcaption { color: #fff; background: linear-gradient(0deg, rgba(0, 20, 58, 0.93), transparent); }
.travel-card strong { color: #0d2d77; font-size: 10px; line-height: 1.2; }
.travel-card.wide strong { color: #fff; }
.travel-card small { color: #67809f; font-size: 8px; line-height: 1.2; }
.travel-card.wide small { color: #fff; }

.news-section { padding-top: 32px; padding-bottom: 24px; }
.news-grid { grid-template-columns: repeat(3, 1fr); }
.news-grid article {
  min-height: 115px;
  padding: 16px 18px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 7px;
  transition: transform 180ms ease, box-shadow 180ms ease;
}
.news-grid article > div { margin-bottom: 7px; display: flex; align-items: center; gap: 15px; }
.news-badge { padding: 3px 7px; border-radius: 3px; font-size: 8px; font-weight: 700; }
.news-badge.red { color: #ef4646; background: #ffe9e9; }
.news-badge.blue { color: #2076e8; background: #e7f1ff; }
.news-badge.green { color: #16a662; background: #e3f7eb; }
.news-grid time { color: #8992a2; font-size: 9px; }

.organizers-section { padding-top: 54px; padding-bottom: 64px; }
.organizers-heading { margin-bottom: 26px; }
.organizer-groups { display: grid; gap: 24px; }
.organizer-group {
  overflow: hidden;
  background: #f5f9ff;
  border: 1px solid #d9e6f3;
  border-radius: 12px;
}
.organizer-group-title {
  min-height: 44px;
  margin: 0;
  padding: 11px 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #0b3975;
  background: #dcedfb;
  border-bottom: 1px solid #cfdfef;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.035em;
}
.organizer-grid {
  padding: 18px 22px 22px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}
.organizer-grid-single { grid-template-columns: minmax(0, 440px); justify-content: center; padding-block: 24px 28px; }
.organizer-card {
  min-width: 0;
  min-height: 178px;
  padding: 20px 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  color: #0a2f68;
  text-align: center;
  background: #fff;
  border: 1px solid #d5e2f0;
  border-radius: 10px;
}
.organizer-host-group .organizer-card { min-height: 176px; padding-block: 16px; background: transparent; border: 0; }
.organizer-card img { width: auto; max-width: 118px; height: 78px; object-fit: contain; }
.organizer-host-group .organizer-card img { max-width: 112px; height: 88px; }
.organizer-card strong { max-width: 590px; font-size: 14px; font-weight: 650; line-height: 1.45; }
.organizer-card-text { min-height: 178px; padding-inline: 44px; }
.organizer-card-text strong { font-size: 15px; }

.site-footer {
  position: relative;
  overflow: hidden;
  color: #fff;
  background: linear-gradient(105deg, #062e65 0%, #06407f 54%, #07509a 100%);
  isolation: isolate;
}
.site-footer::after {
  position: absolute;
  z-index: 0;
  right: clamp(-56px, -2vw, -12px);
  bottom: 24px;
  width: clamp(540px, 44vw, 820px);
  aspect-ratio: 3 / 1;
  content: "";
  pointer-events: none;
  background: url("assets/images/ai-energy-footer-v21.webp") right bottom / contain no-repeat;
  opacity: 0.3;
}
.footer-main {
  position: relative;
  z-index: 1;
  width: min(1340px, calc(100% - 48px));
  min-height: 188px;
  padding: 22px 12px 18px;
  display: grid;
  grid-template-columns: 270px 270px 250px 240px 180px;
  gap: 26px;
  align-items: start;
}
.footer-brand-block { min-width: 0; }
.footer-logo-frame {
  width: 222px;
  min-height: 74px;
  padding: 8px 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: #fff;
  border-radius: 6px;
  box-shadow: 0 8px 22px rgba(0, 20, 60, 0.14);
}
.footer-logo-frame img { width: 100%; height: auto; max-height: 58px; object-fit: contain; }
.footer-brand-block p { max-width: 245px; margin-top: 9px; color: #e2edfa; font-size: 12px; line-height: 1.55; }
.footer-section { min-width: 0; min-height: 150px; padding-left: 26px; border-left: 1px solid rgba(255, 255, 255, 0.16); }
.footer-section h3 { margin: 0 0 14px; color: #fff; font-size: 13px; font-weight: 800; letter-spacing: 0.015em; text-transform: uppercase; }
.footer-link-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 20px; }
.footer-link-grid a { color: #e1ecf9; font-size: 12px; line-height: 1.4; }
.footer-link-grid a:hover { color: #fff; text-decoration: underline; }
.footer-detail-list, .footer-contact-list { margin: 0; padding: 0; display: grid; gap: 10px; list-style: none; }
.footer-detail-list li, .footer-contact-list li { display: flex; align-items: flex-start; gap: 9px; color: #e4eef9; font-size: 12px; line-height: 1.4; }
.footer-detail-list i, .footer-contact-list i { width: 15px; margin-top: 2px; flex: 0 0 15px; color: #bfe6ff; font-size: 13px; text-align: center; }
.footer-detail-list span { min-width: 0; display: grid; }
.footer-detail-list small { color: #e4eef9; font-size: 12px; line-height: 1.35; }
.footer-detail-list strong { margin-top: 2px; color: #fff; font-size: 12px; font-weight: 700; }
.footer-contact-list a, .footer-contact-list span { min-width: 0; color: #e4eef9; overflow-wrap: anywhere; }
.footer-contact-list a:hover { color: #fff; text-decoration: underline; }
.footer-wechat { display: grid; align-content: start; justify-items: start; }
.footer-qr-frame { width: 92px; height: 92px; padding: 4px; display: block; overflow: hidden; background: #fff; border-radius: 5px; }
.footer-qr-frame img { width: 100%; height: 100%; object-fit: contain; }
.footer-wechat > small { margin-top: 7px; color: #dbeafb; font-size: 11px; line-height: 1.45; }
.footer-bottom { position: relative; z-index: 1; border-top: 1px solid rgba(255, 255, 255, 0.16); }
.footer-bottom-inner { width: min(1340px, calc(100% - 48px)); min-height: 40px; margin-inline: auto; padding: 10px 12px; display: flex; align-items: center; color: #e6effa; font-size: 11.5px; }

.submission-modal {
  position: relative;
  width: min(92vw, 480px);
  padding: 36px;
  color: #1a2755;
  text-align: center;
  border: 0;
  border-radius: 14px;
  box-shadow: 0 24px 80px rgba(0, 23, 76, 0.32);
}
.submission-modal::backdrop { background: rgba(1, 13, 40, 0.66); backdrop-filter: blur(4px); }
.submission-modal .modal-icon { color: var(--blue); font-size: 38px; }
.submission-modal h2 { margin: 14px 0 9px; color: var(--navy); }
.submission-modal p { margin: 0 0 22px; color: var(--muted); line-height: 1.6; }
.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 34px;
  height: 34px;
  color: #6b7891;
  background: #eef3f8;
  border: 0;
  border-radius: 50%;
  cursor: pointer;
}
:focus-visible { outline: 3px solid rgba(12, 122, 248, 0.48); outline-offset: 3px; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}

@media (max-width: 1400px) {
  .topbar { width: calc(100vw - 40px); grid-template-columns: 220px minmax(0, 1fr) 220px; padding-inline: 18px; gap: 14px; }
  .brand { width: 220px; }
  .brand img { width: 220px; max-height: 64px; }
  .main-menu { gap: clamp(14px, 1.3vw, 20px); }
  .nav-link { padding-inline: 3px; font-size: 13px; }
  .language-switch { min-width: 78px; }
  .submit-button { height: 46px; padding-inline: 15px; font-size: 12px; }
  .hero-content { padding-top: 190px; }
  .footer-main { grid-template-columns: 1.15fr 1.15fr 1.05fr 1fr 0.75fr; gap: 14px; }
  .footer-section { padding-left: 16px; }
}

@media (max-height: 820px) and (min-width: 931px) {
  .hero-content { padding-top: 160px; }
  .hero-actions { margin-top: 22px; }
  .countdown { margin-top: 22px; }
  .countdown > div { height: 76px; }
}

@media (max-width: 1180px) {
  :root { --page: min(94vw, 1050px); }
  .topbar { width: calc(100vw - 40px); display: flex; grid-template-columns: none; padding-inline: 18px; gap: 16px; }
  .brand { width: 200px; min-width: 200px; flex-basis: 200px; }
  .brand img { width: 200px; }
  .main-menu { gap: 12px; }
  .nav-link { font-size: 12px; }
  .language-switch { min-width: 78px; }
  .submit-button { padding-inline: 14px; }
  .topic-card { padding-left: 66px; }
  .topic-card > i { left: 14px; }
  .footer-main { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px 20px; }
  .footer-brand-block { grid-column: 1 / -1; }
  .footer-section { min-height: 0; padding-left: 0; border-left: 0; }
}

@media (max-width: 1180px) {
  .topbar { top: 16px; min-height: 72px; border-radius: 14px; }
  .brand { width: 200px; min-width: 200px; flex-basis: 200px; }
  .brand img { width: 200px; height: auto; max-height: 54px; }
  .nav-toggle {
    width: 42px;
    height: 42px;
    margin-left: auto;
    display: grid;
    place-items: center;
    color: var(--navy);
    background: #edf4fc;
    border: 0;
    border-radius: 8px;
    cursor: pointer;
  }
  .main-menu {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    left: 0;
    padding: 14px;
    display: none;
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid rgba(216, 226, 240, 0.92);
    border-radius: 14px;
    box-shadow: 0 20px 44px rgba(4, 31, 78, 0.24);
    backdrop-filter: blur(18px);
    max-height: calc(100vh - 112px);
    overflow-y: auto;
  }
  .main-menu.open { display: block; }
  .main-menu > .nav-link, .nav-group > .nav-link { width: 100%; min-height: 44px; padding-inline: 12px; font-family: "Inter", "Microsoft YaHei", sans-serif; font-size: 12px; }
  .nav-group { display: block; }
  .nav-parent { justify-content: space-between; }
  .nav-link::after { bottom: 3px; }
  .submenu,
  .submenu-right {
    position: static;
    width: auto;
    min-width: 0;
    margin: 0 8px 8px;
    padding: 7px;
    display: none;
    background: #f3f7fc;
    border: 0;
    border-radius: 9px;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
  }
  .nav-group:hover > .submenu,
  .nav-group:focus-within > .submenu { transform: none; }
  .nav-group.open > .submenu { display: grid; transform: none; }
  .submenu a { min-height: 39px; padding: 9px 13px; font-size: 12px; }
  .submenu a:hover, .submenu a:focus-visible { padding-left: 16px; }
}

@media (max-width: 930px) {
  :root { --page: min(91vw, 760px); --hero-page: min(91vw, 760px); }
  body { font-size: 14px; }
  .hero { height: 760px; min-height: 760px; background-position: 57% center; }
  .topbar { width: calc(100vw - 32px); }
  .brand { width: 190px; min-width: 190px; flex-basis: 190px; }
  .brand img { width: 190px; height: auto; max-height: 48px; }
  .language-switch, .submit-button { height: 42px; }
  .hero-content { padding-top: 150px; }
  .hero h1 { font-size: clamp(39px, 6.1vw, 52px); }
  .conference-name { font-size: clamp(69px, 11vw, 93px); }
  .hero-note { display: none; }
  .announcement-strip { grid-template-columns: 1fr 1fr; }
  .announcement-item, .important-link { min-height: 86px; padding: 16px 18px; border-bottom: 1px solid var(--line); }
  .announcement-item:nth-child(2) { border-right: 0; }
  .announcement-item:nth-child(4) { border-right: 0; }
  .announcement-item:nth-child(5) { grid-column: 1 / -1; border-right: 0; border-bottom: 0; }
  .overview-section { grid-template-columns: 1fr 1fr; gap: 32px; }
  .overview-copy p, .call-copy p { font-size: 13px; }
  .city-card { height: 290px; min-height: 290px; }
  .topic-grid { grid-template-columns: repeat(2, 1fr); }
  .topic-card:nth-child(4n) { border-right: 1px solid var(--line); }
  .topic-card:nth-child(2n) { border-right: 0; }
  .topic-card:nth-child(n + 5) { border-bottom: 1px solid var(--line); }
  .topic-card:nth-child(n + 7) { border-bottom: 0; }
  .call-copy { width: 64%; }
  .committee-grid, .publication-grid { grid-template-columns: repeat(2, 1fr); }
  .person-card { min-height: 152px; }
  .venue-section { grid-template-columns: 1fr 1fr; }
  .venue-copy, .travel-card.wide { grid-column: 1 / -1; }
  .venue-copy { padding-right: 0; }
  .travel-card { min-height: 250px; }
  .organizer-card { padding-inline: 20px; }
  .footer-main { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px 20px; }
  .footer-brand-block { grid-column: 1 / -1; }
  .footer-section { min-height: 0; padding-left: 0; border-left: 0; }
}

@media (max-width: 620px) {
  :root { --page: calc(100% - 30px); --hero-page: calc(100% - 48px); }
  body { font-size: 13px; }
  .hero { height: 671px; min-height: 671px; background-position: 61% center; }
  .hero-shade { background: linear-gradient(90deg, rgba(3, 25, 75, 0.85), rgba(3, 30, 82, 0.47) 78%, rgba(2, 29, 73, 0.16)); }
  .topbar { top: 12px; width: calc(100% - 24px); min-height: 78px; padding: 8px 12px; border-radius: 12px; }
  .brand { width: 150px; min-width: 150px; flex-basis: 150px; }
  .brand img { width: 150px; height: auto; max-height: 42px; }
  .language-switch { display: none; }
  .submit-button { padding-inline: 11px; font-size: 9px; }
  .submit-button i { display: none; }
  .hero-content { padding-top: 134px; }
  .eyebrow { font-size: 15px; }
  .hero h1 { max-width: 100%; margin-top: 6px; font-size: clamp(27px, 8.15vw, 34px); line-height: 1.12; }
  .conference-name { margin-top: 10px; font-size: clamp(50px, 15.8vw, 66px); line-height: 1.07; }
  .hero-meta { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 7px 18px; font-size: 12px; }
  .hero-meta i { font-size: 13px; }
  .hero-actions { margin-top: 22px; gap: 8px; }
  .hero-action { height: 50px; min-width: 0; padding-inline: 10px; flex: 1 1 0; gap: 7px; font-size: 11px; white-space: nowrap; }
  .hero-action-ghost { flex-grow: 1.2; }
  .countdown { width: 100%; margin-top: 24px; gap: 7px; }
  .countdown > div { width: auto; height: 70px; }
  .countdown strong { font-size: 28px; }
  .countdown span { font-size: 7px; }
  .countdown-caption { gap: 8px; font-size: 10px; }
  .countdown-caption::before { width: 25px; }
  .announcement-strip { width: calc(100% - 32px); margin-top: -40px; grid-template-columns: 1fr; }
  .announcement-item, .announcement-item:nth-child(2), .announcement-item:nth-child(3), .announcement-item:nth-child(4), .announcement-item:nth-child(5), .important-link {
    min-height: 76px;
    padding: 12px 14px;
    grid-column: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .announcement-item:last-child, .important-link { justify-content: flex-start; border-bottom: 0; }
  .announcement-item > i, .important-link > i:first-child { width: 40px; height: 40px; font-size: 17px; }
  .announcement-item strong, .important-link strong { font-size: 11px; }
  .section { padding-top: 44px; }
  .section-title { font-size: 31px; }
  .overview-section { padding-top: 48px; grid-template-columns: 1fr; }
  .overview-copy p, .call-copy p, .venue-copy p { font-size: 13px; }
  .city-card { height: 240px; min-height: 240px; }
  .section-heading-row { margin-bottom: 18px; align-items: flex-end; gap: 12px; }
  .section-heading-row > a { max-width: 110px; text-align: right; }
  .topic-grid, .committee-grid, .publication-grid, .news-grid, .venue-section { grid-template-columns: 1fr; }
  .topic-card, .topic-card:nth-child(4n), .topic-card:nth-child(2n), .topic-card:nth-child(n + 5), .topic-card:nth-child(n + 7) {
    min-height: 140px;
    padding-top: 52px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .topic-card:last-child { border-bottom: 0; }
  .timeline { padding-left: 12px; grid-template-columns: 1fr; gap: 18px; text-align: left; }
  .timeline::before { top: 8px; bottom: 8px; left: 18px; width: 2px; height: auto; }
  .timeline-item { padding-left: 32px; justify-items: start; }
  .timeline-item > span { position: absolute; top: 1px; left: 0; }
  .timeline-item strong, .timeline-item small { font-size: 11px; }
  .call-section {
    min-height: 470px;
    background:
      linear-gradient(0deg, rgba(236, 247, 255, 0.98) 0%, rgba(236, 247, 255, 0.94) 62%, rgba(236, 247, 255, 0.18) 100%),
      url("assets/images/ai-energy-hero-v21.webp") 68% center / cover no-repeat;
  }
  .call-inner { min-height: 470px; padding-top: 190px; padding-bottom: 36px; align-items: flex-end; }
  .call-copy { width: 100%; }
  .button-row { flex-wrap: wrap; }
  .person-card { min-height: 150px; }
  .person-card img { width: 94px; }
  .venue-copy, .travel-card.wide { grid-column: auto; }
  .travel-card { min-height: 230px; }
  .organizers-section { padding-top: 44px; padding-bottom: 48px; }
  .organizers-heading { margin-bottom: 20px; }
  .organizer-groups { gap: 18px; }
  .organizer-group-title { min-height: 42px; font-size: 11px; }
  .organizer-grid, .organizer-grid-single { padding: 14px; grid-template-columns: 1fr; gap: 12px; }
  .organizer-card, .organizer-card-text, .organizer-host-group .organizer-card { min-height: 148px; padding: 18px; }
  .organizer-card img { height: 66px; max-width: 100px; }
  .organizer-host-group .organizer-card img { height: 76px; max-width: 100px; }
  .organizer-card strong, .organizer-card-text strong { font-size: 12px; line-height: 1.5; }
  .footer-main { width: calc(100% - 34px); padding: 20px 10px 16px; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
  .footer-logo-frame { width: 222px; max-width: 100%; }
  .footer-brand-block p { max-width: 290px; }
  .footer-link-grid { gap: 8px 12px; }
  .footer-link-grid a, .footer-detail-list li, .footer-contact-list li, .footer-detail-list small { font-size: 11.5px; }
  .footer-detail-list strong { font-size: 12px; }
  .footer-qr-frame { width: 90px; height: 90px; }
  .footer-wechat > small { font-size: 10.5px; }
  .footer-bottom-inner { width: calc(100% - 34px); padding: 10px; }
  .site-footer::after {
    right: -108px;
    bottom: 22px;
    width: 620px;
    opacity: 0.16;
  }
}

@media (max-width: 480px) {
  .topbar { gap: 10px; }
  .brand { width: 164px; min-width: 0; flex: 0 1 164px; }
  .brand img { width: 164px; }
  .nav-actions { display: none; }
  .nav-toggle { margin-left: auto; flex: 0 0 42px; }
  .mobile-menu-actions {
    margin-top: 8px;
    padding-top: 10px;
    display: grid;
    grid-template-columns: 78px 1fr;
    gap: 8px;
    border-top: 1px solid var(--line);
  }
  .language-switch.mobile-language { width: 78px; min-width: 78px; height: 42px; display: inline-flex; }
  .mobile-menu-cta {
    min-height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    color: #fff;
    background: var(--blue);
    border-radius: 8px;
    font-size: 11px;
    font-weight: 800;
  }
}