.hero {
  background-color: var(--background-color);
  background-image: linear-gradient(var(--border-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-color) 1px, transparent 1px);
  background-size: 40px 40px;
  background-position: center top;
}

.btn-custom {
  border-radius: 0;
  padding: 12px 30px;
  letter-spacing: 1px;
  text-transform: uppercase;
  font-size: 0.9rem;
  transition: all 0.3s ease;
}

.timeline-item {
  border-left: 1px solid var(--accent-color);
  padding-left: 30px;
  position: relative;
  padding-bottom: 40px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 0;
  width: 11px;
  height: 11px;
  background-color: var(--background-color);
  border: 2px solid var(--accent-color);
  border-radius: 50%;
}

.card-minimal {
  border: 1px solid var(--border-color);
  background: var(--surface-color);
  border-radius: 4px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card-minimal:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
  border-color: var(--accent-color);
}

.nav-tabs .nav-link {
  color: #6c757d;
  border: none;
  border-bottom: 2px solid transparent;
  font-weight: 400;
  transition: all 0.3s ease;
}

.nav-tabs .nav-link:hover {
  color: var(--accent-color);
}

.nav-tabs .nav-link.active {
  color: #000000 !important;
  border-bottom: 2px solid var(--accent-color) !important;
  background-color: transparent;
  font-weight: 700 !important;
}

#tutors img {
  width: 100%;
  border-radius: 50%;
  border: 1px solid white;
  transition: all 0.3s;
}

#tutors img:hover {
  border: 1px solid var(--accent-color);
  transform: scale(1.05);
}

@media (max-width: 768px) {
  .timeline-item {
    margin-left: 15px;
  }
}

.finals-border-fix {
  border-right: 1px solid #dee2e6;
}

.text-black {
  color: black;
}

.bg-custom-1 {
  background-color: var(--accent-color);
}

.bg-custom-2 {
  background-color: #ccc;
}

.bg-custom-3 {
  background-color: #999;
}

ul.text-secondary li span {
  color: var(--accent-color);
  font-size: 0.75em;
  padding-left: 5px;
}

#schedule .btn {
  padding: 2px 12px;
}

ol.text-secondary {
  margin-left: 8px;
}

ul.text-secondary {
  margin-left: 6px;
}

.co-organizer span {
  white-space: nowrap;
}

.max-width-600 {
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
  max-width: 600px;
}

#logos span img {
  width: 150px;
  padding: 0 12px;
  mix-blend-mode: multiply;
  will-change: opacity;
  opacity: 0;
}

#logos.visible span img {
  opacity: 1;
  transition: opacity 0.3s ease;
}

.footer-logo {
  margin: -10px -10px 10px;
  width: 180px;
}

@keyframes fadeInMultiply {
  to {
    opacity: 1;
  }
}

@media (max-width: 768px) {
  .finals-border-fix {
    border-right: none;
    border-bottom: 1px solid #dee2e6;
    margin-bottom: 15px;
    padding-bottom: 15px;
  }

  .footer-logo {
    margin: 0 auto 10px;
    text-align: center;
  }
}

@media (max-width: 767.98px) {
  #tutors .container .row img {
    width: 55% !important;
    height: auto;
    margin: 0 auto;
    /* 居中 */
  }

  #footer span {
    display: block;
    margin: 0 auto;
  }

  #footer .social-links {
    justify-content: center;
    margin-bottom: 20px;
  }

  #footer .social-links a {
    margin-left: 10px;
    margin-right: 10px;
  }

  ul.text-secondary li span {
    display: block;
    padding-left: 0;
  }

  #logos.visible span img {
    width: 120px;
  }
}

@media (max-width: 600px) {
  .sitename {
    font-size: 1.6em !important;
  }
}

/* Event day timeline — competition.php #event-flow */
.event-day-timeline {
  overflow: hidden;
}

.event-day-timeline__chip {
  display: inline-block;
  padding: 6px 14px;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  border: 1px solid var(--accent-color);
  color: var(--accent-color);
  font-weight: 600;
}

.event-day-timeline__chip--muted {
  border-color: var(--border-color);
  color: var(--default-color);
  font-weight: 400;
}

.event-day-timeline__track {
  position: relative;
  --timeline-time-col: 5.5rem;
  --timeline-marker-col: 1.5rem;
}

.event-day-timeline__track::before {
  content: '';
  position: absolute;
  left: calc(var(--timeline-time-col) + var(--timeline-marker-col) / 2 - 1px);
  top: 1.25rem;
  bottom: 1.25rem;
  width: 2px;
  background: linear-gradient(
    180deg,
    var(--accent-color) 0%,
    color-mix(in srgb, var(--accent-color) 40%, var(--border-color)) 45%,
    var(--border-color) 100%
  );
  z-index: 0;
}

.event-day-timeline__item {
  display: grid;
  grid-template-columns: var(--timeline-time-col) var(--timeline-marker-col) 1fr;
  gap: 0 1.25rem;
  align-items: start;
  padding-bottom: 2rem;
  position: relative;
  z-index: 1;
}

.event-day-timeline__item:last-child {
  padding-bottom: 0;
}

.event-day-timeline__item--span .event-day-timeline__marker--span {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  transform: rotate(45deg);
  margin-top: 0.65rem;
}

.event-day-timeline__time {
  text-align: right;
  padding-top: 0.35rem;
  line-height: 1.2;
}

.event-day-timeline__clock {
  display: block;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--heading-color);
  font-variant-numeric: tabular-nums;
}

.event-day-timeline__clock-sub {
  display: block;
  font-size: 0.8rem;
  color: var(--accent-color);
  font-weight: 600;
  margin-top: 2px;
}

.event-day-timeline__clock-sub::before {
  content: '– ';
  color: var(--default-color);
  font-weight: 400;
}

.event-day-timeline__clock-alt {
  display: block;
  font-size: 0.7rem;
  color: var(--default-color);
  margin-top: 2px;
}

.event-day-timeline__clock-alt::before {
  content: '· ';
}

.event-day-timeline__phase {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--default-color);
}

.event-day-timeline__marker {
  width: 14px;
  height: 14px;
  margin-top: 0.5rem;
  justify-self: center;
  border-radius: 50%;
  background: var(--surface-color);
  border: 3px solid var(--accent-color);
  box-shadow: 0 0 0 1px var(--accent-color);
  z-index: 2;
}

.event-day-timeline__marker--highlight {
  width: 18px;
  height: 18px;
  margin-top: 0.35rem;
  background: var(--accent-color);
  border-color: var(--surface-color);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent-color) 25%, transparent);
}

.event-day-timeline__marker--end {
  background: var(--heading-color);
  border-color: var(--surface-color);
  box-shadow: none;
}

.event-day-timeline__card {
  border: 1px solid var(--border-color);
  background: var(--background-color);
  padding: 1.25rem 1.5rem;
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}

.event-day-timeline__item:hover .event-day-timeline__card {
  border-color: color-mix(in srgb, var(--accent-color) 50%, var(--border-color));
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
  transform: translateX(4px);
}

.event-day-timeline__item--highlight .event-day-timeline__card {
  border-color: var(--accent-color);
  background: linear-gradient(
    135deg,
    color-mix(in srgb, var(--accent-color) 8%, var(--surface-color)) 0%,
    var(--background-color) 100%
  );
}

.event-day-timeline__item--highlight:hover .event-day-timeline__card {
  transform: translateX(6px);
  box-shadow: 0 12px 32px color-mix(in srgb, var(--accent-color) 15%, transparent);
}

.event-day-timeline__card-head {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  margin-bottom: 0.75rem;
}

.event-day-timeline__icon {
  font-size: 1.35rem;
  color: var(--accent-color);
  line-height: 1;
  margin-top: 0.15rem;
}

.event-day-timeline__tag {
  display: inline-block;
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 2px 8px;
  margin-bottom: 0.35rem;
  border: 1px solid var(--accent-color);
  color: var(--accent-color);
}

.event-day-timeline__tag--fill {
  background: var(--accent-color);
  color: var(--contrast-color, #fff);
}

.event-day-timeline__title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--heading-color);
}

.event-day-timeline__desc {
  font-size: 0.9rem;
  color: var(--default-color);
  line-height: 1.6;
}

.event-day-timeline__sublist {
  list-style: none;
  padding: 0;
  margin: 0.75rem 0 0;
  border-top: 1px dashed var(--border-color);
  padding-top: 0.75rem;
}

.event-day-timeline__sublist li {
  font-size: 0.85rem;
  color: var(--default-color);
  padding: 0.25rem 0;
}

.event-day-timeline__sublist li span {
  display: inline-block;
  min-width: 7rem;
  font-weight: 600;
  color: var(--heading-color);
  font-size: 0.8rem;
}

.event-day-timeline__slots {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.event-day-timeline__slot {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  border: 1px solid var(--border-color);
  background: var(--surface-color);
  color: var(--heading-color);
}

.event-day-timeline__venue {
  letter-spacing: 0.02em;
}

.event-day-timeline__awards {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.event-day-timeline__awards span {
  padding: 0.35rem 0.85rem;
  font-size: 0.8rem;
  border: 1px solid var(--border-color);
  color: var(--default-color);
}

.event-day-timeline__awards-champion {
  border-color: var(--accent-color) !important;
  color: var(--accent-color) !important;
  font-weight: 700;
}

@media (max-width: 575.98px) {
  .event-day-timeline__track {
    --timeline-time-col: 4.25rem;
    --timeline-marker-col: 1.25rem;
  }

  .event-day-timeline__track::before {
    left: calc(var(--timeline-time-col) + var(--timeline-marker-col) / 2 - 1px);
  }

  .event-day-timeline__item {
    gap: 0 0.75rem;
    padding-bottom: 1.5rem;
  }

  .event-day-timeline__clock {
    font-size: 0.95rem;
  }

  .event-day-timeline__card {
    padding: 1rem 1.1rem;
  }

  .event-day-timeline__item:hover .event-day-timeline__card,
  .event-day-timeline__item--highlight:hover .event-day-timeline__card {
    transform: none;
  }

  .event-day-timeline__sublist li span {
    display: block;
    min-width: 0;
    margin-bottom: 0.15rem;
  }
}

.lang-switch__btn {
  display: inline-block;
  padding: 4px 10px;
  border: 1px solid var(--border-color);
  color: var(--default-color);
  font-size: 0.75rem;
  text-decoration: none;
  transition: all 0.2s ease;
}

.lang-switch__btn:hover {
  border-color: var(--accent-color);
  color: var(--accent-color);
}

.lang-switch__btn.is-active {
  border-color: var(--accent-color);
  background: var(--accent-color);
  color: var(--contrast-color);
}

@media (max-width: 1199px) {
  .lang-switch {
    margin-right: 2.5rem;
  }
}

/* Winners page — winners.php */
.winners-coming-soon__icon,
.event-gallery-coming-soon__icon {
  display: block;
  font-size: 2.5rem;
  color: var(--accent-color);
  margin-bottom: 1rem;
}

.winners-award-card__label {
  display: block;
  font-weight: 600;
  color: var(--heading-color);
}

.winners-award-card__status {
  flex-shrink: 0;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  padding: 4px 10px;
  border: 1px solid var(--border-color);
  color: var(--default-color);
}

.winners-award-card--pending .winners-award-card__placeholder {
  font-style: italic;
  opacity: 0.7;
}

/* Event gallery — gallery.php */
.event-gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

.event-gallery-grid__item {
  margin: 0;
}

.event-gallery-grid__placeholder {
  aspect-ratio: 4 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in srgb, var(--default-color) 6%, #fff);
  border: 1px dashed var(--border-color);
  border-radius: 4px;
  color: color-mix(in srgb, var(--default-color) 45%, transparent);
  font-size: 1.75rem;
}

.event-gallery-grid__caption {
  margin-top: 0.5rem;
  font-size: 0.8rem;
  color: var(--default-color);
  text-align: center;
}

@media (max-width: 991px) {
  .event-gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 575px) {
  .event-gallery-grid {
    grid-template-columns: 1fr;
  }
}