:root {
  --page: #f7fbf7;
  --paper: rgba(255, 255, 255, 0.74);
  --paper-solid: #ffffff;
  --ink: #17211f;
  --muted: #66706d;
  --faint: #8a938f;
  --line: rgba(23, 33, 31, 0.12);
  --line-strong: rgba(23, 33, 31, 0.2);
  --teal: #11b9ad;
  --mint: #9bea78;
  --coral: #ff684d;
  --cobalt: #3167ff;
  --sun: #ffd369;
  --shadow: 0 22px 80px rgba(22, 39, 35, 0.1);
  --max: 1180px;
  --radius: 10px;
  --font:
    "SF Pro Display", "SF Pro Text", "Helvetica Neue", "PingFang SC",
    "Noto Sans CJK SC", "Source Han Sans SC", "Microsoft YaHei UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 150px;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font);
  font-weight: 350;
  letter-spacing: 0;
  background:
    radial-gradient(circle at 8% 12%, rgba(49, 103, 255, 0.12), transparent 28%),
    radial-gradient(circle at 86% 8%, rgba(255, 104, 77, 0.12), transparent 26%),
    linear-gradient(135deg, rgba(17, 185, 173, 0.08), transparent 36%),
    var(--page);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(23, 33, 31, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 33, 31, 0.035) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.92), transparent 88%);
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
}

.site-header {
  position: fixed;
  top: 18px;
  left: 50%;
  z-index: 30;
  display: grid;
  grid-template-columns: minmax(220px, auto) 1fr auto;
  align-items: center;
  gap: 24px;
  width: min(calc(100% - 36px), var(--max));
  min-height: 60px;
  padding: 9px 11px;
  border: 1px solid rgba(255, 255, 255, 0.78);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 12px 46px rgba(22, 39, 35, 0.1);
  transform: translateX(-50%);
  backdrop-filter: blur(18px);
}

.brand,
.site-nav,
.hero-actions,
.register-actions {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  min-width: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(17, 185, 173, 0.16), rgba(49, 103, 255, 0.12)),
    rgba(255, 255, 255, 0.84);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.82);
}

.brand-mark img {
  width: 28px;
  height: 28px;
  object-fit: contain;
}

.brand-name {
  overflow: hidden;
  color: #22241f;
  font-size: 0.86rem;
  font-weight: 400;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.site-nav {
  justify-content: center;
  gap: 20px;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 350;
}

.site-nav a {
  padding: 9px 0;
  transition: color 0.2s ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--ink);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 15px;
  border-radius: 999px;
  color: #ffffff;
  font-size: 0.88rem;
  font-weight: 420;
  background: linear-gradient(135deg, var(--teal), var(--cobalt));
  box-shadow: 0 14px 34px rgba(49, 103, 255, 0.18);
}

.hero {
  position: relative;
  overflow: hidden;
  display: grid;
  align-content: end;
  min-height: 86svh;
  padding: 132px max(18px, calc((100vw - var(--max)) / 2)) 32px;
  background:
    linear-gradient(120deg, rgba(247, 251, 247, 0.9), rgba(247, 251, 247, 0.58)),
    linear-gradient(180deg, rgba(255, 255, 255, 0.62), rgba(247, 251, 247, 0.96));
}

#quantum-field {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
}

.hero-noise {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(
      0deg,
      rgba(255, 255, 255, 0.2) 0,
      rgba(255, 255, 255, 0.2) 1px,
      transparent 1px,
      transparent 4px
    );
  opacity: 0.44;
}

.hero-content,
.hero-logo,
.hero-dock {
  position: relative;
  z-index: 2;
}

.hero-content {
  position: relative;
  z-index: 3;
  max-width: 980px;
}

.hero-content::before {
  content: "";
  position: absolute;
  inset: -24px -34px -20px -34px;
  z-index: -1;
  pointer-events: none;
  border-radius: 28px;
  background:
    radial-gradient(circle at 16% 28%, rgba(255, 255, 255, 0.86), rgba(255, 255, 255, 0.38) 56%, transparent 76%),
    linear-gradient(90deg, rgba(247, 251, 247, 0.76), rgba(247, 251, 247, 0.22), transparent);
}

.hero-logo {
  position: absolute;
  right: max(18px, calc((100vw - var(--max)) / 2) - 8px);
  top: 118px;
  z-index: 1;
  width: min(34vw, 440px);
  aspect-ratio: 1;
  opacity: 0.78;
  transform: rotate(-8deg);
  pointer-events: none;
  mix-blend-mode: multiply;
}

.hero-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: saturate(1.04);
  animation: logoFloat 7s ease-in-out infinite;
}

.section-kicker {
  margin: 0 0 18px;
  color: #2b7f79;
  font-size: 0.78rem;
  font-weight: 380;
  text-transform: uppercase;
}

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

h1 {
  max-width: 780px;
  margin-bottom: 24px;
  font-size: 2.72rem;
  font-weight: 250;
  line-height: 1.18;
  letter-spacing: -0.035em;
  text-shadow: 0 12px 30px rgba(247, 251, 247, 0.9);
}

.hero-lede {
  max-width: 700px;
  color: #34423f;
  font-size: 1.02rem;
  font-weight: 320;
  line-height: 1.85;
  text-shadow: 0 10px 24px rgba(247, 251, 247, 0.9);
}

.hero-actions {
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 400;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    border-color 0.2s ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
}

.button-primary {
  color: #ffffff;
  background: linear-gradient(135deg, var(--coral), #f22f6d 48%, var(--cobalt));
  box-shadow: 0 18px 42px rgba(242, 47, 109, 0.22);
}

.button-soft {
  border-color: rgba(23, 33, 31, 0.16);
  background: rgba(255, 255, 255, 0.64);
}

.hero-dock {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  width: min(100%, 1040px);
  margin-top: 58px;
  overflow: hidden;
  border: 1px solid rgba(23, 33, 31, 0.1);
  border-radius: var(--radius);
  background: rgba(23, 33, 31, 0.1);
  box-shadow: var(--shadow);
}

.hero-dock div {
  min-height: 104px;
  padding: 20px;
  background: rgba(255, 255, 255, 0.76);
  backdrop-filter: blur(18px);
}

.hero-dock span,
.organizer-list span,
.timeline span,
.deliverable-grid span,
.score-row span {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 380;
}

.hero-dock strong {
  color: var(--ink);
  font-size: 1.02rem;
  font-weight: 420;
}

@keyframes logoFloat {
  0%,
  100% {
    transform: translate3d(0, 0, 0) rotate(0deg);
  }

  50% {
    transform: translate3d(0, -14px, 0) rotate(2deg);
  }
}

.container {
  width: min(calc(100% - 36px), var(--max));
  margin: 0 auto;
}

section:not(.hero) {
  padding: 96px 0;
}

.intro-section,
.timeline-section,
.register-section,
.news-section {
  background: rgba(255, 255, 255, 0.52);
}

.intro-grid,
.split-layout,
.submit-layout,
.judge-layout,
.register-layout,
.news-layout,
.contact-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 64px;
  align-items: start;
}

.section-copy h2 {
  margin-bottom: 18px;
  font-size: 1.68rem;
  font-weight: 250;
  line-height: 1.32;
  letter-spacing: -0.03em;
}

.section-copy p:not(.section-kicker),
.intro-copy p,
.track-card p,
.group-content p,
.timeline p,
.deliverable-grid p,
.news-section p,
.register-panel p {
  color: var(--muted);
  font-weight: 350;
  line-height: 1.76;
}

.center {
  max-width: 760px;
  margin: 0 auto 44px;
  text-align: center;
}

.organizer-list {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.organizer-list div {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.68);
}

.organizer-list strong {
  display: block;
  color: var(--ink);
  font-weight: 420;
  line-height: 1.55;
}

.track-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.track-card,
.group-panel,
.timeline article,
.award-card,
.deliverable-grid article,
.score-board,
.register-panel {
  border: 1px solid rgba(23, 33, 31, 0.1);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.track-card {
  position: relative;
  overflow: hidden;
  min-height: 310px;
  padding: 26px;
}

.track-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 5px;
  background: linear-gradient(90deg, var(--teal), var(--mint), var(--coral));
}

.track-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-bottom: 40px;
  border-radius: 50%;
  color: #ffffff;
  font-size: 0.88rem;
  font-weight: 420;
  background: linear-gradient(135deg, var(--coral), var(--cobalt));
}

.track-card h3,
.group-content h3,
.timeline h3,
.deliverable-grid h3,
.register-panel h3 {
  margin-bottom: 14px;
  color: var(--ink);
  font-size: 1.18rem;
  font-weight: 350;
  line-height: 1.42;
}

.group-panel {
  overflow: hidden;
  padding: 8px;
  background: rgba(255, 255, 255, 0.7);
}

.segmented {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 8px;
}

.segmented button {
  cursor: pointer;
  min-height: 48px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  color: var(--muted);
  font-weight: 400;
  background: transparent;
}

.segmented button.active {
  color: #ffffff;
  background: linear-gradient(135deg, var(--teal), var(--cobalt));
}

.group-content {
  display: none;
  padding: 28px;
  border-radius: var(--radius);
  background: #ffffff;
}

.group-content.active {
  display: block;
}

.group-content ul {
  display: grid;
  gap: 12px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.group-content li {
  position: relative;
  padding-left: 20px;
  color: #3c4a47;
  font-weight: 350;
  line-height: 1.65;
}

.group-content li::before {
  content: "";
  position: absolute;
  top: 0.75em;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--coral);
}

.timeline {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid rgba(23, 33, 31, 0.1);
  border-radius: var(--radius);
  background: rgba(23, 33, 31, 0.08);
}

.timeline article {
  min-height: 244px;
  padding: 24px;
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

.awards-section {
  background:
    linear-gradient(135deg, rgba(255, 104, 77, 0.08), transparent 32%),
    linear-gradient(225deg, rgba(49, 103, 255, 0.08), transparent 36%),
    rgba(255, 255, 255, 0.46);
}

.awards-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 16px;
}

.award-card {
  position: relative;
  overflow: hidden;
  min-height: 250px;
  padding: 26px;
  background: rgba(255, 255, 255, 0.72);
}

.award-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 5px;
  background: linear-gradient(90deg, var(--coral), var(--cobalt));
}

.award-card.grand::before {
  background: linear-gradient(90deg, var(--teal), var(--mint), var(--coral));
}

.award-card span {
  display: inline-flex;
  margin-bottom: 28px;
  color: #2b7f79;
  font-size: 0.88rem;
  font-weight: 380;
}

.award-card h3 {
  margin-bottom: 10px;
  font-size: 1.16rem;
  font-weight: 350;
}

.award-card strong {
  display: block;
  margin-bottom: 18px;
  color: var(--ink);
  font-size: 2rem;
  font-weight: 250;
  line-height: 1;
  letter-spacing: -0.03em;
}

.award-card p {
  margin: 0;
  color: var(--muted);
  font-weight: 350;
  line-height: 1.72;
}

.news-section {
  background:
    linear-gradient(120deg, rgba(17, 185, 173, 0.08), transparent 36%),
    rgba(255, 255, 255, 0.52);
}

.news-list {
  display: grid;
  gap: 12px;
}

.news-item a {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr) auto;
  gap: 24px;
  align-items: center;
  padding: 20px;
  border: 1px solid rgba(23, 33, 31, 0.1);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.news-item span {
  color: var(--faint);
  font-size: 0.86rem;
  font-weight: 350;
}

.news-item strong {
  min-width: 0;
  font-size: 1rem;
  font-weight: 350;
  line-height: 1.5;
}

.news-item em {
  color: #2b7f79;
  font-size: 0.86rem;
  font-style: normal;
  font-weight: 350;
}

.news-item.is-empty {
  opacity: 0.72;
}

.submit-section {
  background:
    linear-gradient(90deg, rgba(17, 185, 173, 0.08), transparent 42%),
    linear-gradient(270deg, rgba(255, 104, 77, 0.08), transparent 36%);
}

.deliverable-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.deliverable-grid article {
  padding: 26px;
}

.deliverable-grid span {
  color: var(--coral);
}

.score-board {
  display: grid;
  overflow: hidden;
}

.score-row {
  padding: 24px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
}

.score-row:last-child {
  border-bottom: 0;
}

.score-row strong {
  display: block;
  font-size: 1rem;
  font-weight: 350;
  line-height: 1.65;
}

.register-panel {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 24px;
  padding: 24px;
  align-items: center;
}

.qr-placeholder {
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  border: 1px dashed rgba(23, 33, 31, 0.28);
  border-radius: var(--radius);
  background:
    linear-gradient(45deg, rgba(49, 103, 255, 0.12) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(17, 185, 173, 0.16) 25%, transparent 25%),
    #ffffff;
  background-size: 18px 18px;
}

.qr-placeholder span {
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  border-radius: var(--radius);
  color: #ffffff;
  font-weight: 420;
  background: linear-gradient(135deg, var(--teal), var(--coral));
}

.register-actions {
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.contact-section {
  padding-bottom: 120px;
  background: #eef8f1;
}

.contact-grid h2 {
  margin: 0;
  font-size: 1.65rem;
  font-weight: 250;
  line-height: 1.25;
  letter-spacing: -0.03em;
}

.contact-list {
  display: grid;
  gap: 12px;
}

.contact-list a,
.contact-list span {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  color: #2c3835;
  font-weight: 350;
}

.js [data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition:
    opacity 0.75s ease,
    transform 0.75s ease;
}

.js [data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

.js .hero-logo.is-visible {
  opacity: 0.78;
}

.js .site-header[data-reveal] {
  transform: translateX(-50%) translateY(-14px);
}

.js .site-header[data-reveal].is-visible {
  transform: translateX(-50%) translateY(0);
}

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

@media (max-width: 1040px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .site-nav {
    grid-column: 1 / -1;
    grid-row: 2;
    justify-content: flex-start;
    overflow-x: auto;
    padding: 2px 0;
  }

  h1 {
    font-size: 2.24rem;
  }

  .section-copy h2 {
    font-size: 1.5rem;
  }

  .intro-grid,
  .split-layout,
  .submit-layout,
  .judge-layout,
  .register-layout,
  .news-layout,
  .contact-grid,
  .track-grid,
  .awards-grid,
  .timeline {
    grid-template-columns: 1fr;
  }

  .timeline article {
    min-height: auto;
  }
}

@media (max-width: 760px) {
  html {
    scroll-padding-top: 156px;
  }

  .site-header {
    top: 10px;
    width: min(calc(100% - 20px), var(--max));
    gap: 10px;
  }

  .brand-name {
    max-width: 15em;
  }

  .nav-cta {
    min-height: 38px;
    padding: 0 13px;
    font-size: 0.86rem;
  }

  .site-nav {
    gap: 16px;
    font-size: 0.86rem;
  }

  .hero {
    min-height: 88svh;
    padding: 150px 18px 22px;
  }

  #quantum-field {
    opacity: 0.84;
  }

  .hero-content::before {
    inset: -18px -16px -16px -16px;
    background:
      radial-gradient(circle at 18% 34%, rgba(255, 255, 255, 0.82), rgba(255, 255, 255, 0.42) 58%, transparent 78%),
      linear-gradient(90deg, rgba(247, 251, 247, 0.62), rgba(247, 251, 247, 0.18), transparent);
  }

  .hero-logo {
    top: 138px;
    right: -44px;
    z-index: 1;
    width: 198px;
    opacity: 0.18;
    mix-blend-mode: normal;
    transform: rotate(-8deg);
  }

  .js .hero-logo.is-visible {
    opacity: 0.18;
  }

  .hero-logo img {
    animation-duration: 8s;
  }

  h1 {
    font-size: 1.5rem;
    line-height: 1.18;
  }

  .hero-lede {
    font-size: 0.94rem;
    line-height: 1.76;
  }

  .hero-actions,
  .register-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .hero-dock {
    grid-template-columns: 1fr 1fr;
    margin-top: 34px;
  }

  .hero-dock div {
    min-height: 92px;
    padding: 16px;
  }

  .hero-dock strong {
    font-size: 1rem;
  }

  section:not(.hero) {
    padding: 72px 0;
  }

  .container {
    width: min(calc(100% - 28px), var(--max));
  }

  .section-copy h2 {
    font-size: 1.22rem;
  }

  .center {
    text-align: left;
  }

  .track-card,
  .award-card {
    min-height: auto;
  }

  .award-card strong {
    font-size: 1.65rem;
  }

  .track-index {
    margin-bottom: 28px;
  }

  .news-item a {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 18px;
  }

  .deliverable-grid,
  .register-panel {
    grid-template-columns: 1fr;
  }

  .qr-placeholder {
    max-width: 180px;
  }
}