:root {
  --font: "DM Sans", "Segoe UI", system-ui, sans-serif;
  --bg-deep: #060d18;
  --bg: #0a1424;
  --surface: #121f38;
  --surface-soft: #1a2d4f;
  --line: rgba(150, 180, 230, 0.22);
  --line-light: rgba(110, 150, 210, 0.22);
  --text: #e8f2ff;
  --text-muted: #9eb4d4;
  --text-dark: #152238;
  --text-body: #2d4568;
  --accent: #3eb8ff;
  --accent-soft: #8ed4ff;
  --accent-2: #6b7dff;
  --accent-glow: rgba(62, 184, 255, 0.32);
  --success: #5eecc4;
  --warn: #ffd080;
  --radius-sm: 10px;
  --radius: 14px;
  --radius-lg: 18px;
  --shadow-sm: 0 4px 16px rgba(12, 28, 56, 0.07);
  --shadow-md: 0 14px 36px rgba(12, 28, 56, 0.11);
  --shadow-lg: 0 22px 52px rgba(0, 0, 0, 0.28);
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg-deep);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: #7ed9ff;
  transition: color 0.15s var(--ease);
}

a:hover {
  color: #b7f2ff;
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

/* —— Header —— */
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  backdrop-filter: blur(14px) saturate(1.2);
  background: rgba(6, 13, 24, 0.82);
  border-bottom: 1px solid var(--line);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 64px;
}

.brand {
  text-decoration: none;
  font-weight: 800;
  font-size: 17px;
  letter-spacing: 0.04em;
  color: #eef6ff;
  transition: opacity 0.15s var(--ease);
}

.brand:hover {
  opacity: 0.88;
  color: #eef6ff;
}

.nav-list {
  list-style: none;
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}

.nav-list a {
  text-decoration: none;
  color: #b8d0f0;
  font-size: 14px;
  font-weight: 500;
  padding: 7px 12px;
  border-radius: var(--radius-sm);
  border-bottom: none;
  transition:
    background 0.15s var(--ease),
    color 0.15s var(--ease);
}

.nav-list a:hover {
  background: rgba(62, 184, 255, 0.14);
  color: #fff;
}

.nav-list a[aria-current="page"] {
  background: rgba(62, 184, 255, 0.2);
  color: #fff;
  font-weight: 600;
}

/* —— Hero —— */
.hero {
  position: relative;
  padding: 64px 0 80px;
  overflow: hidden;
  background-color: #070f1e;
  background-image:
    linear-gradient(165deg, rgba(6, 12, 24, 0.35), rgba(10, 22, 44, 0.2)),
    url("/assets/images/eccv-malmo-hero.jpg");
  background-position: center 40%;
  background-size: cover;
  background-repeat: no-repeat;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(
      108deg,
      rgba(4, 9, 20, 0.92) 0%,
      rgba(8, 18, 38, 0.68) 48%,
      rgba(16, 36, 68, 0.42) 100%
    ),
    radial-gradient(ellipse 70% 55% at 88% 12%, rgba(107, 125, 255, 0.18), transparent 55%),
    radial-gradient(ellipse 50% 40% at 8% 90%, rgba(62, 184, 255, 0.1), transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 32px;
  align-items: center;
}

.hero-left {
  align-self: center;
}

.hero-heading {
  margin: 0;
  max-width: 900px;
}

.hero-heading-line {
  display: block;
  font-size: clamp(32px, 4.8vw, 54px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: #fcfdff;
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.35);
}

.hero-heading-event {
  display: block;
  margin-top: 14px;
  font-size: clamp(16px, 2.2vw, 22px);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-soft);
}

.subtitle {
  margin: 20px 0 24px;
  max-width: 680px;
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.65;
  color: rgba(232, 242, 255, 0.88);
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  border-radius: var(--radius-sm);
  padding: 11px 20px;
  font-weight: 700;
  font-size: 14px;
  border: 1px solid transparent;
  transition:
    transform 0.18s var(--ease),
    box-shadow 0.18s var(--ease),
    background 0.18s var(--ease),
    border-color 0.18s var(--ease);
}

.button.primary {
  background: linear-gradient(135deg, #4ec4ff 0%, #8ee0ff 100%);
  color: #062038;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.button.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 32px var(--accent-glow);
  color: #041828;
}

.button.ghost {
  background: rgba(255, 255, 255, 0.07);
  color: #eef6ff;
  border-color: rgba(255, 255, 255, 0.28);
  backdrop-filter: blur(8px);
}

.button.ghost:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.45);
  transform: translateY(-1px);
  color: #fff;
}

.glass {
  border: 1px solid rgba(200, 220, 255, 0.22);
  background: linear-gradient(
    155deg,
    rgba(28, 48, 82, 0.82) 0%,
    rgba(18, 34, 62, 0.78) 100%
  );
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(12px);
}

.hero-panel {
  display: flex;
  flex-direction: column;
  width: fit-content;
  max-width: 100%;
  justify-self: end;
}

.hero-panel-brand {
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

.hero-panel-logo-wrap {
  display: flex;
  justify-content: center;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.hero-panel-logo {
  display: block;
  width: auto;
  max-width: 200px;
  height: auto;
  max-height: 44px;
}

.hero-panel-eyebrow {
  margin: 14px 0 0;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #8eb0dc;
}

.hero-panel-headline {
  margin: 6px 0 0;
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: #fbfdff;
}

.hero-panel-meta {
  list-style: none;
  margin: 16px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid rgba(180, 210, 255, 0.2);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.hero-panel-meta li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px 12px;
  align-items: baseline;
  margin: 0;
}

.hero-meta-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #8aa8d4;
  white-space: nowrap;
}

.hero-meta-value {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
  color: #eef4ff;
}

/* —— Layout & sections —— */
main {
  padding-bottom: 0;
}

.section {
  padding: 72px 0;
  position: relative;
}

.section h2 {
  margin: 0 0 20px;
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  position: relative;
  padding-bottom: 14px;
}

.section h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 52px;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.section-light {
  color: var(--text-dark);
  background:
    radial-gradient(ellipse 90% 60% at 0% 0%, rgba(94, 180, 255, 0.07), transparent 55%),
    radial-gradient(ellipse 70% 50% at 100% 100%, rgba(107, 125, 255, 0.05), transparent 50%),
    linear-gradient(180deg, #f8fbff 0%, #edf3fc 100%);
}

.section-light h2 {
  color: var(--text-dark);
}

.section-light h2::after {
  background: linear-gradient(90deg, #2a9fd9, #5a72e8);
}

.section-dark {
  background:
    radial-gradient(ellipse 80% 50% at 100% 0%, rgba(107, 125, 255, 0.12), transparent 50%),
    radial-gradient(ellipse 60% 40% at 0% 100%, rgba(62, 184, 255, 0.08), transparent 45%),
    linear-gradient(180deg, #0e1a30 0%, #0a1222 100%);
}

.section-dark h2 {
  color: #f4f8ff;
}

.section-dark h2::after {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.section-note {
  margin: -8px 0 22px;
  color: #5a7399;
  font-size: 15px;
  line-height: 1.5;
}

.section-dark .section-note {
  color: #8fa8cc;
}

/* —— Cards —— */
.grid {
  display: grid;
  gap: 18px;
}

.grid.two {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid.three {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card {
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid var(--line-light);
  transition:
    transform 0.2s var(--ease),
    box-shadow 0.2s var(--ease),
    border-color 0.2s var(--ease);
}

.section-light .card {
  background: #fff;
  color: var(--text-body);
  box-shadow: var(--shadow-sm);
}

.section-light .card:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(100, 150, 220, 0.35);
}

.section-dark .card {
  background: linear-gradient(160deg, rgba(22, 38, 68, 0.95) 0%, rgba(16, 28, 52, 0.98) 100%);
  color: var(--text);
  border-color: rgba(140, 175, 230, 0.2);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.22);
}

.section-dark .card:hover {
  transform: translateY(-3px);
  border-color: rgba(160, 200, 255, 0.35);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.32);
}

.section-dark .card a {
  color: var(--accent-soft);
}

/* —— About —— */
.about-intro-lede {
  margin: 0 0 20px;
  max-width: 42rem;
  font-size: 16px;
  line-height: 1.65;
  color: #4a6288;
}

.about-intro-lede strong {
  font-weight: 800;
  color: var(--text-dark);
}

.problem-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: prob;
  display: grid;
  gap: 14px;
}

@media (min-width: 800px) {
  .problem-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.problem-list li {
  counter-increment: prob;
  position: relative;
  margin: 0;
  padding: 18px 16px 18px 48px;
  min-height: 100%;
  border-radius: var(--radius);
  border: 1px solid rgba(120, 160, 220, 0.28);
  background: linear-gradient(165deg, #fff 0%, #f2f7ff 100%);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text-dark);
  box-shadow: var(--shadow-sm);
  transition:
    transform 0.2s var(--ease),
    box-shadow 0.2s var(--ease);
}

.problem-list li:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.problem-list li::before {
  content: counter(prob);
  position: absolute;
  left: 14px;
  top: 16px;
  width: 28px;
  height: 28px;
  border-radius: 9px;
  font-size: 13px;
  font-weight: 800;
  line-height: 28px;
  text-align: center;
  color: #062038;
  background: linear-gradient(135deg, #6ecfff, #9ab0ff);
}

/* —— Program —— */
.program-split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.program-column {
  position: relative;
  overflow: hidden;
}

.program-column::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: var(--radius) var(--radius) 0 0;
}

.program-column:first-child::before {
  background: linear-gradient(90deg, #3eb8ff, #6ecfff);
}

.program-column:last-child::before {
  background: linear-gradient(90deg, #6b7dff, #9ab0ff);
}

.program-slot-title {
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(130, 158, 200, 0.28);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-dark);
}

.program-rows {
  list-style: none;
  margin: 0;
  padding: 0;
}

.program-rows li {
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 9px 0;
  border-bottom: 1px solid rgba(130, 158, 200, 0.22);
  font-size: 14px;
  color: var(--text-body);
}

.program-rows li:last-child {
  border-bottom: none;
}

.program-time {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 12px;
  color: #5a7aa8;
  letter-spacing: 0.02em;
}

.program-item {
  font-weight: 550;
  line-height: 1.45;
}

/* —— Speakers & organizers —— */
.speaker .speaker-status {
  margin: 0 0 6px;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.speaker-status.confirmed {
  color: var(--success);
}

.speaker-status.tentative {
  color: var(--warn);
}

.speaker h3,
.organizer-cards .person-meta h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.organizer-cards .person-meta h3 {
  padding-top: 2px;
}

.speaker-affil {
  margin: 4px 0 0;
  font-size: 13px;
  color: #9eb8e0;
}

.person-row {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 12px;
}

.person-photo {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 2px solid rgba(140, 190, 255, 0.4);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.25);
  transition: transform 0.2s var(--ease);
}

.section-light .person-photo {
  border-color: rgba(100, 150, 220, 0.45);
  box-shadow: 0 6px 16px rgba(18, 40, 76, 0.1);
}

.card:hover .person-photo {
  transform: scale(1.03);
}

.person-meta {
  flex: 1;
  min-width: 0;
}

.speaker .person-bio,
.organizer-cards .person-bio {
  margin: 0;
  font-size: 14px;
  line-height: 1.5;
  color: #a8c4e8;
}

.organizer-cards .person-bio {
  color: #4a6288;
}

.student-co-org {
  margin-top: 28px;
  padding: 18px 22px;
  border-radius: var(--radius);
  border: 1px dashed rgba(120, 155, 210, 0.45);
  background: rgba(255, 255, 255, 0.55);
  max-width: 100%;
}

.student-co-org-title {
  margin: 0 0 10px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #6a84a8;
}

.student-co-org-names {
  margin: 0;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--text-body);
}

/* —— CfP teaser —— */
.cfp-teaser {
  max-width: 46rem;
  margin-inline: auto;
  text-align: center;
  padding: 28px 32px !important;
}

.cfp-teaser-text {
  margin: 0;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text-body);
}

.cfp-teaser-meta {
  margin: 16px 0 0;
  font-size: 15px;
  color: #4a6288;
}

.cfp-teaser-actions {
  margin-top: 22px;
  display: flex;
  justify-content: center;
}

.section-light .cfp-teaser .button.primary {
  color: #062038;
}

/* —— Sponsors —— */
.sponsors-section {
  padding-bottom: 80px;
}

.sponsors-intro {
  max-width: 40rem;
  margin-bottom: 8px;
}

.section-dark .sponsors-intro {
  color: #9eb4d8;
}

.sponsors-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
}

.sponsor-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  min-width: min(320px, 100%);
  padding: 28px 32px 24px;
  border-radius: var(--radius-lg);
  text-decoration: none;
  border: 1px solid rgba(150, 190, 250, 0.25);
  background: linear-gradient(160deg, rgba(24, 42, 76, 0.9), rgba(14, 28, 54, 0.95));
  box-shadow: var(--shadow-lg);
  color: inherit;
  transition:
    transform 0.2s var(--ease),
    border-color 0.2s var(--ease),
    box-shadow 0.2s var(--ease);
}

.sponsor-card:hover {
  transform: translateY(-4px);
  border-color: rgba(180, 220, 255, 0.45);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.35);
  color: inherit;
}

.sponsor-logo-frame {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.98);
}

.sponsor-logo {
  display: block;
  max-height: 42px;
  width: auto;
}

.sponsor-name-zh {
  font-size: 20px;
  font-weight: 700;
  color: #f6faff;
  letter-spacing: 0.05em;
}

.sponsor-name-en {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
}

/* —— CfP page —— */
.page-main {
  padding-top: 48px !important;
  padding-bottom: 72px !important;
  min-height: 50vh;
}

.page-main .container > .grid.two {
  margin-top: 8px;
}

.page-title {
  margin: 0 0 12px;
  font-size: clamp(30px, 3.5vw, 40px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--text-dark);
  padding-bottom: 14px;
  position: relative;
}

.page-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 52px;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, #2a9fd9, #5a72e8);
}

.page-lead {
  margin-bottom: 28px;
  max-width: 44rem;
}

.card-heading {
  margin: 0 0 14px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text-dark);
}

.page-card-wide {
  margin-top: 18px;
}

.page-card-wide p {
  margin: 0;
  line-height: 1.65;
}

.page-back {
  margin: 32px 0 0;
  font-size: 14px;
}

.page-back a {
  color: #3a6eb8;
  font-weight: 600;
  text-decoration: none;
}

.page-back a:hover {
  text-decoration: underline;
  color: #2a5a9a;
}

ul {
  padding-left: 1.2em;
  margin: 0;
}

.card ul li {
  margin-top: 6px;
  line-height: 1.55;
}

.card ul li:first-child {
  margin-top: 0;
}

/* —— Footer —— */
footer {
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, #081018 0%, #050a12 100%);
  padding: 28px 0;
}

.footer-wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-wrap p {
  margin: 0;
  font-size: 14px;
  color: #8fa8cc;
}

.footer-wrap a {
  color: var(--accent-soft);
  font-weight: 600;
}

/* —— Responsive —— */
@media (max-width: 980px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .hero-panel {
    justify-self: start;
    width: fit-content;
  }

  .hero {
    padding: 48px 0 56px;
  }
}

@media (max-width: 760px) {
  .program-split {
    grid-template-columns: 1fr;
  }

  .program-rows li {
    grid-template-columns: 1fr;
    gap: 4px;
    padding: 10px 0;
  }

  .nav-wrap {
    min-height: auto;
    padding: 12px 0;
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-list {
    width: 100%;
  }

  .section {
    padding: 52px 0;
  }

  .cfp-teaser {
    padding: 22px 20px !important;
    text-align: left;
  }

  .cfp-teaser-actions {
    justify-content: flex-start;
  }

  .footer-wrap {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}