:root {
  --ink: #443f38;
  --muted: #6d6f70;
  --paper: #fffdf9;
  --wash: #edf2f3;
  --gold: #9f7430;
  --gold-soft: #c3a778;
  --line: #b88b4c;
  --content: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  background: var(--paper);
}

a {
  color: var(--gold);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 253, 249, 0.94);
  backdrop-filter: blur(12px);
}

.nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  max-width: 1180px;
  min-height: 58px;
  margin: 0 auto;
  padding: 0 32px;
}

.brand,
.footer-brand {
  color: var(--gold);
  font-family: "Cormorant Garamond", Georgia, serif;
  font-size: 27px;
  font-weight: 700;
  letter-spacing: 0;
}

.brand-mark {
  margin-right: 6px;
  color: var(--gold);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 28px;
  grid-column: 2;
  font-size: 14px;
  font-weight: 600;
}

.nav-links a {
  color: #5d574f;
}

.hero {
  position: relative;
  min-height: 620px;
  padding: 42px 32px 54px;
  overflow: hidden;
  text-align: center;
  background:
    linear-gradient(rgba(10, 18, 24, 0.24), rgba(10, 18, 24, 0.58)),
    url("assets/images/shenyang-night.jpg") center / cover no-repeat;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.ornament {
  margin: 0 0 18px;
  color: var(--gold);
  font-size: 34px;
  line-height: 1;
  text-align: center;
}

.section .ornament,
.event-section .ornament,
.submission-panel .ornament,
.committee-section .ornament {
  color: var(--gold);
}

.icdm-logo {
  display: block;
  width: min(260px, 58vw);
  height: auto;
  margin: 0 auto 30px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 22px;
  color: #777d82;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.32em;
  text-align: center;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: rgba(255, 255, 255, 0.92);
  letter-spacing: 0.12em;
  text-transform: none;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.25);
}

h1,
h2,
h3 {
  margin: 0;
  font-family: "Cormorant Garamond", Georgia, serif;
  font-weight: 600;
  line-height: 0.95;
  letter-spacing: 0;
}

h1 {
  max-width: 980px;
  margin: 0 auto;
  color: #fff;
  font-size: 84px;
  font-family: "Cormorant Garamond", Georgia, serif;
  font-weight: 600;
  line-height: 0.95;
  text-transform: none;
  text-shadow: 0 3px 24px rgba(0, 0, 0, 0.34);
}

.subtitle {
  max-width: 610px;
  margin: 30px auto 0;
  color: #fff;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.22em;
  line-height: 1.45;
  text-transform: uppercase;
  text-shadow: 0 2px 14px rgba(0, 0, 0, 0.35);
}

.outline-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 240px;
  min-height: 48px;
  margin-top: 44px;
  padding: 10px 28px;
  border: 1px solid rgba(255, 255, 255, 0.86);
  border-radius: 999px;
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.28);
}

.outline-button:hover {
  background: rgba(255, 255, 255, 0.12);
  text-decoration: none;
}

.arch-line {
  fill: none;
  stroke-width: 12;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.line-a {
  stroke: #486f7d;
}

.line-b {
  stroke: #a35e45;
  opacity: 0.8;
}

.line-c {
  stroke: #758256;
  opacity: 0.78;
}

.line-d {
  stroke: #8d8375;
  opacity: 0.55;
}

.signal-orbit {
  fill: none;
  stroke: rgba(159, 116, 48, 0.26);
  stroke-width: 2;
}

.section {
  max-width: var(--content);
  margin: 0 auto;
  padding: 104px 32px;
  scroll-margin-top: 88px;
}

.split-section {
  padding-top: 118px;
  padding-bottom: 148px;
}

.about-layout {
  display: grid;
  grid-template-columns: 0.38fr 1.62fr;
  gap: 56px;
  align-items: center;
}

.about-title {
  align-self: stretch;
  padding-right: 44px;
  border-right: 1px solid rgba(159, 116, 48, 0.72);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.about-title h2 {
  margin: 0;
  font-size: 40px;
  text-align: center;
}

.about-icon {
  margin: 0 0 22px;
  color: var(--gold);
  display: block;
  width: 42px;
  height: 32px;
  fill: currentColor;
}

.about-copy {
  max-width: none;
  margin: 0;
  padding: 8px 0;
}

.about-copy p {
  margin: 0 0 22px;
  color: #555b61;
  font-size: 16px;
  line-height: 1.78;
  text-align: justify;
}

.cfp-intro {
  max-width: 820px;
  line-height: 1.55;
}

.split-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 72px;
  align-items: start;
}

.split-grid article + article {
  border-left: 1px solid rgba(159, 116, 48, 0.55);
  padding-left: 72px;
}

.section h2,
.event-section h2 {
  max-width: 900px;
  margin: 0 auto 34px;
  color: #4a453d;
  font-size: 54px;
  text-align: center;
}

.split-grid h2 {
  margin: 0 0 42px;
  font-size: 48px;
  text-align: left;
}

.section p,
.plain-list,
.topic-columns {
  color: #555b61;
}

.center-copy {
  max-width: 680px;
  margin: 0 auto 54px;
  text-align: center;
}

.call-section {
  max-width: none;
  padding-top: 112px;
  padding-bottom: 122px;
  background: #edf3f4;
  text-align: center;
}

.call-section .ornament,
.call-section .section-kicker,
.call-section h2,
.call-section .center-copy,
.call-section .topic-columns {
  color: var(--ink);
}

.call-section .topic-columns {
  max-width: 980px;
}

.call-section li {
  color: #555b61;
}

.call-section .ornament {
  color: var(--gold);
}

.call-section .section-kicker {
  color: #777d82;
}

.topic-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 54px;
  max-width: 1040px;
  margin: 0 auto;
  text-align: left;
}

.topic-columns ul,
.plain-list {
  margin: 0;
  padding-left: 22px;
}

.topic-columns li,
.plain-list li {
  margin: 10px 0;
}

.event-section {
  padding: 118px 32px 128px;
  background: var(--paper);
  text-align: center;
}

.event-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 26px;
  max-width: var(--content);
  margin: 62px auto 0;
}

.event-card {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  min-height: 350px;
  padding: 54px 28px 28px;
  border-radius: 220px 220px 0 0;
  background:
    linear-gradient(rgba(255, 253, 249, 0.76), rgba(255, 253, 249, 0.62)),
    radial-gradient(circle at 50% 18%, rgba(159, 116, 48, 0.13), transparent 34%),
    linear-gradient(160deg, rgba(32, 63, 130, 0.1), rgba(159, 116, 48, 0.12)),
    #fffdf9;
}

.event-card h3 {
  color: #4a453d;
  font-size: 30px;
}

.event-card p {
  margin: auto 0 78px;
  color: var(--gold);
  font-size: 24px;
  font-weight: 700;
}

.submission-panel {
  max-width: none;
  padding-top: 78px;
  padding-bottom: 84px;
  padding-left: max(32px, calc((100vw - var(--content)) / 2));
  padding-right: max(32px, calc((100vw - var(--content)) / 2));
  background: var(--wash);
  text-align: center;
}

.speakers-section {
  background: var(--paper);
}

.speakers-section .speaker-grid {
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.committee-section {
  max-width: none;
  background: var(--wash);
}

#organizers {
  max-width: none;
  background: var(--wash);
}

.call-section > *,
#organizers > *,
.committee-section > * {
  max-width: var(--content);
  margin-left: auto;
  margin-right: auto;
}

.submission-panel h2 {
  margin-bottom: 48px;
  font-size: 52px;
}

.submission-card {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(260px, 3fr);
  max-width: 1040px;
  margin: 0 auto;
  gap: 0;
  align-items: stretch;
}

.submission-media {
  width: 100%;
  height: 100%;
  min-height: 320px;
  object-fit: cover;
  object-position: center;
  background: #fffdf9;
}

.submission-copy {
  min-height: 320px;
  padding: 34px 44px;
  background: #fff;
  text-align: left;
}

.submission-site {
  margin: 0 0 18px;
  color: #4a453d;
}

.people-section {
  text-align: center;
}

.speaker-grid,
.organizer-grid {
  display: grid;
  justify-content: center;
  align-items: start;
  gap: 56px 70px;
  margin-top: 54px;
}

.speaker-grid {
  grid-template-columns: repeat(2, minmax(220px, 260px));
}

.organizer-grid {
  grid-template-columns: repeat(6, minmax(0, 1fr));
}

.organizer-grid .person-card {
  grid-column: span 2;
}

.organizer-grid .person-card:nth-child(1) {
  grid-column: 2 / span 2;
}

.organizer-grid .person-card:nth-child(2) {
  grid-column: 4 / span 2;
}

.person-card img {
  width: 164px;
  height: 164px;
  border: 5px solid #d5d8db;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
}

.person-card img.photo-tianyi {
  padding: 12px;
  object-fit: contain;
  object-position: center;
  background: #fff;
}

.person-card h3 {
  margin: 22px 0 7px;
  color: var(--gold);
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.2;
}

.person-card p {
  max-width: 250px;
  margin: 0 auto 4px;
  color: #62676b;
  font-size: 15px;
  font-weight: 600;
}

.person-card a {
  display: inline-block;
  margin-top: 4px;
  font-size: 14px;
}

.committee-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 48px 72px;
}

.committee-layout article {
  border-top: 1px solid rgba(159, 116, 48, 0.48);
  padding-top: 24px;
}

.committee-layout .wide {
  grid-column: 1 / -1;
}

.committee-layout h3 {
  margin: 0 0 18px;
  color: var(--gold);
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.committee-layout p {
  margin: 8px 0;
  color: #555b61;
}

.footer {
  padding: 44px 32px 42px;
  background: var(--paper);
}

.footer-brand {
  max-width: 1120px;
  margin: 0 auto;
}

.footer-rule {
  max-width: 1120px;
  height: 1px;
  margin: 28px auto 32px;
  background: var(--line);
}

.footer-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.1fr 1.4fr;
  gap: 42px;
  max-width: 1120px;
  margin: 0 auto;
}

.footer h3 {
  margin: 0 0 16px;
  color: #777d82;
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.32em;
  text-transform: uppercase;
}

.footer a,
.footer p {
  display: block;
  margin: 5px 0;
  color: #555b61;
}

.footer-contact {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 28px;
}

.footer-contact p {
  margin: 0;
}

@media (max-width: 920px) {
  .nav {
    grid-template-columns: 1fr;
    gap: 16px;
    padding-top: 18px;
    padding-bottom: 18px;
  }

  .nav-links {
    grid-column: 1;
    justify-content: flex-start;
    gap: 14px 20px;
  }

  h1 {
    font-size: 58px;
  }

  .hero {
    min-height: 560px;
  }

  .split-grid,
  .about-layout,
  .topic-columns,
  .submission-card,
  .committee-layout,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .split-grid article + article {
    border-left: 0;
    border-top: 1px solid rgba(159, 116, 48, 0.45);
    padding-left: 0;
    padding-top: 54px;
  }

  .about-title {
    min-height: auto;
    padding-right: 0;
    padding-bottom: 42px;
    border-right: 0;
    border-bottom: 1px solid rgba(159, 116, 48, 0.45);
  }

  .submission-media {
    height: 260px;
    min-height: 260px;
  }

  .event-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .organizer-grid {
    grid-template-columns: repeat(2, minmax(220px, 260px));
  }

  .organizer-grid .person-card,
  .organizer-grid .person-card:nth-child(1),
  .organizer-grid .person-card:nth-child(2) {
    grid-column: auto;
    transform: none;
  }
}

@media (max-width: 620px) {
  .section,
  .event-section,
  .hero,
  .footer {
    padding-left: 22px;
    padding-right: 22px;
  }

  h1 {
    font-size: 44px;
  }

  .hero {
    min-height: 500px;
  }

  .section h2,
  .event-section h2 {
    font-size: 40px;
  }

  .split-grid h2 {
    font-size: 38px;
  }

  .event-grid,
  .speaker-grid,
  .organizer-grid {
    grid-template-columns: 1fr;
  }

  .submission-copy {
    padding: 38px 28px;
  }
}