:root {
  --ink: #171a1d;
  --ink-soft: #24282c;
  --muted: #626a70;
  --paper: #f4f6f4;
  --white: #ffffff;
  --line: #d9dfdc;
  --teal: #07858d;
  --teal-dark: #05656c;
  --teal-pale: #dceff0;
  --coral: #dd5547;
  --gold: #e5b84c;
  --header-height: 68px;
  color-scheme: light;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 24px);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  letter-spacing: 0;
}

body.menu-open {
  overflow: hidden;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 1000;
  padding: 8px 12px;
  color: var(--white);
  background: var(--ink);
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.section-shell,
.nav-shell,
.hero-shell {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  border-bottom: 1px solid rgba(23, 26, 29, 0.12);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(14px);
}

.nav-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 17px;
  font-weight: 800;
  text-decoration: none;
}

.brand img {
  width: 24px;
  height: 34px;
  object-fit: contain;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav a {
  position: relative;
  color: #3f464b;
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
}

.site-nav a:not(.nav-register)::after {
  position: absolute;
  right: 0;
  bottom: -9px;
  left: 0;
  height: 2px;
  content: "";
  background: var(--teal);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 160ms ease;
}

.site-nav a:hover::after,
.site-nav a.active::after {
  transform: scaleX(1);
}

.site-nav .nav-register {
  padding: 9px 16px;
  color: var(--white);
  background: var(--ink);
  border-radius: 4px;
}

.site-nav .nav-register:hover {
  background: var(--teal-dark);
}

.menu-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 0;
  color: var(--ink);
  background: transparent;
  border: 0;
  font: inherit;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
}

.menu-icon {
  display: grid;
  width: 20px;
  gap: 4px;
}

.menu-icon span {
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
}

.hero {
  overflow: hidden;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.hero-shell {
  padding: 76px 0 54px;
}

.eyebrow,
.section-index {
  margin: 0 0 12px;
  color: var(--teal-dark);
  font-size: 12px;
  font-weight: 800;
  line-height: 1.35;
  text-transform: uppercase;
}

.hero-logo {
  width: 215px;
  height: auto;
  margin: 0 0 24px;
}

.hero h1 {
  max-width: 850px;
  margin: 0;
  font-size: clamp(42px, 6vw, 72px);
  font-weight: 760;
  line-height: 1.04;
  letter-spacing: 0;
}

.theme-line {
  max-width: 890px;
  margin: 24px 0 0;
  color: var(--teal-dark);
  font-size: clamp(20px, 2.8vw, 30px);
  font-weight: 700;
  line-height: 1.3;
}

.hero-copy {
  max-width: 760px;
  margin: 22px 0 0;
  color: #4f575d;
  font-size: 18px;
}

.status-notice {
  max-width: 800px;
  margin: 24px 0 0;
  padding: 12px 14px;
  color: #4b3a36;
  background: #fff2ee;
  border-left: 3px solid var(--coral);
  font-size: 14px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: 4px;
  font-size: 14px;
  font-weight: 800;
  line-height: 1.2;
  text-decoration: none;
  transition: color 160ms ease, background 160ms ease, border-color 160ms ease;
}

.button-primary {
  color: var(--white);
  background: var(--teal-dark);
}

.button-primary:hover {
  background: var(--ink);
}

.button-secondary {
  color: var(--ink);
  background: transparent;
  border-color: #aeb6b2;
}

.button-secondary:hover {
  border-color: var(--ink);
  background: var(--white);
}

.hero-facts {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  max-width: 920px;
  margin: 54px 0 0;
  border-top: 1px solid #cdd4d0;
  border-bottom: 1px solid #cdd4d0;
}

.hero-facts div {
  min-width: 0;
  padding: 18px 20px 17px 0;
}

.hero-facts div + div {
  padding-left: 20px;
  border-left: 1px solid #cdd4d0;
}

.hero-facts dt {
  color: var(--ink);
  font-size: 24px;
  font-weight: 800;
  line-height: 1.1;
}

.hero-facts dd {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.scene-band,
.content-section,
.data-band,
.organizer-band {
  padding: 92px 0;
}

.scene-band {
  padding-top: 78px;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 42px;
}

.compact-heading {
  margin-bottom: 28px;
}

.section-heading h2,
.overview-grid h2,
.contact-layout h2 {
  margin: 0;
  font-size: clamp(32px, 4.5vw, 50px);
  line-height: 1.12;
  letter-spacing: 0;
}

.section-heading > p:last-child {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 17px;
}

.scene-figure {
  margin: 0;
}

.scene-figure img {
  width: 100%;
  height: auto;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.scene-figure figcaption {
  max-width: 820px;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.overview-band {
  padding: 92px 0;
  color: var(--white);
  background: var(--ink);
}

.overview-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 80px;
}

.light-index {
  color: #7ed2d6;
}

.overview-copy p {
  margin: 0 0 20px;
  color: #cdd3d6;
  font-size: 17px;
}

.overview-copy blockquote {
  margin: 36px 0 0;
  padding: 24px 0 0;
  color: var(--white);
  border-top: 2px solid var(--coral);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.35;
}

.task-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.task-card {
  position: relative;
  min-height: 440px;
  padding: 34px;
  border: 1px solid var(--line);
  border-top: 5px solid var(--teal);
  border-radius: 6px;
  background: var(--white);
}

.task-card-accent {
  border-top-color: var(--coral);
}

.task-number {
  position: absolute;
  top: 26px;
  right: 30px;
  color: #cbd1ce;
  font-size: 32px;
  font-weight: 800;
}

.task-code {
  margin: 0 0 18px;
  color: var(--teal-dark);
  font-size: 13px;
  font-weight: 850;
}

.task-card-accent .task-code {
  color: #b93e32;
}

.task-card h3 {
  max-width: 480px;
  margin: 0;
  font-size: 25px;
  line-height: 1.24;
}

.task-card > p:not(.task-code) {
  margin: 20px 0 0;
  color: var(--muted);
}

.task-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 13px;
}

.task-meta strong {
  margin-right: 5px;
}

.track-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}

.track-list span {
  padding: 6px 9px;
  color: #384045;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 3px;
  font-size: 12px;
  font-weight: 700;
}

.data-band {
  background: var(--paper);
}

.data-layout {
  max-width: 820px;
}

.data-notes h3 {
  margin: 0 0 12px;
  font-size: 20px;
}

.data-notes h3:not(:first-child) {
  margin-top: 32px;
}

.check-list,
.plain-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.check-list li,
.plain-list li {
  position: relative;
  padding: 10px 0 10px 24px;
  color: #4d555a;
  border-bottom: 1px solid var(--line);
}

.check-list li::before {
  position: absolute;
  top: 16px;
  left: 2px;
  width: 9px;
  height: 9px;
  content: "";
  background: var(--teal);
}

.plain-list li::before {
  position: absolute;
  top: 19px;
  left: 2px;
  width: 10px;
  height: 2px;
  content: "";
  background: var(--coral);
}

.evaluation-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 80px;
}

.metric-list {
  border-top: 1px solid var(--line);
}

.metric-row {
  display: grid;
  grid-template-columns: 100px minmax(0, 1fr);
  gap: 28px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.metric-name {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 88px;
  height: 48px;
  color: var(--white);
  background: var(--teal-dark);
  border-radius: 4px;
  font-size: 15px;
  font-weight: 850;
}

.metric-name-coral {
  background: var(--coral);
}

.metric-row h3 {
  margin: 0;
  font-size: 20px;
}

.metric-row p {
  margin: 8px 0 0;
  color: var(--muted);
}

.schedule-band {
  padding: 92px 0 102px;
  color: var(--white);
  background: var(--ink-soft);
}

.schedule-heading > p:last-child {
  color: #bfc6c9;
}

.timeline {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid #4b5358;
}

.timeline li {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: 32px;
  padding: 19px 0;
  border-bottom: 1px solid #4b5358;
}

.timeline time {
  color: #91dade;
  font-size: 14px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.timeline span {
  color: #e7ebed;
}

.timeline-major {
  border-left: 4px solid var(--coral);
}

.timeline-major time,
.timeline-major span {
  padding-left: 16px;
}

.timeline-conference {
  border-left: 4px solid var(--gold);
}

.timeline-conference time,
.timeline-conference span {
  padding-left: 16px;
  color: #f4d889;
  font-weight: 800;
}

.rules-layout {
  display: grid;
  grid-template-columns: minmax(220px, 0.55fr) minmax(0, 1.45fr);
  gap: 80px;
}

.rules-list {
  border-top: 1px solid var(--line);
}

.rules-list article {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 22px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}

.rules-list article > span {
  color: var(--coral);
  font-size: 15px;
  font-weight: 850;
}

.rules-list h3 {
  margin: 0;
  font-size: 19px;
}

.rules-list p {
  margin: 8px 0 0;
  color: var(--muted);
}

.organizer-band {
  background: var(--paper);
}

.organizer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.organizer-grid article {
  min-height: 124px;
  padding: 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 5px;
}

.organizer-grid h3 {
  margin: 0;
  font-size: 18px;
  line-height: 1.3;
}

.organizer-grid p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.organizer-email {
  display: block;
  margin-top: 10px;
  color: var(--teal-dark);
  font-size: 13px;
  overflow-wrap: anywhere;
}

.contact-band {
  padding: 76px 0;
  color: var(--white);
  background: var(--teal-dark);
}

.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 60px;
  align-items: center;
}

.contact-layout h2 {
  max-width: 700px;
}

.contact-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
}

.button-light {
  color: var(--ink);
  background: var(--white);
}

.button-light:hover {
  background: #e9eded;
}

.contact-email {
  color: #d9f2f3;
  font-size: 14px;
}

.site-footer {
  padding: 28px 0;
  color: #c8ced1;
  background: #101214;
}

.footer-layout {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 30px;
  align-items: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--white);
  font-weight: 800;
}

.footer-brand img {
  width: 21px;
  height: 30px;
  filter: brightness(0) invert(1);
}

.site-footer p {
  margin: 0;
  font-size: 13px;
}

.footer-links {
  display: flex;
  gap: 18px;
}

.footer-links a {
  font-size: 13px;
}

@media (max-width: 900px) {
  .menu-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: fixed;
    top: var(--header-height);
    right: 0;
    left: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: calc(100svh - var(--header-height));
    padding: 18px 24px 28px;
    overflow-y: auto;
    background: var(--white);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 18px 34px rgba(23, 26, 29, 0.12);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 13px 4px;
    border-bottom: 1px solid var(--line);
  }

  .site-nav a::after {
    display: none;
  }

  .site-nav .nav-register {
    margin-top: 14px;
    padding: 13px 16px;
    text-align: center;
    border-bottom: 0;
  }

  .overview-grid,
  .evaluation-grid,
  .rules-layout,
  .contact-layout {
    grid-template-columns: 1fr;
    gap: 38px;
  }

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

  .footer-layout {
    grid-template-columns: 1fr;
    gap: 14px;
  }
}

@media (max-width: 680px) {
  :root {
    --header-height: 62px;
  }

  .section-shell,
  .nav-shell,
  .hero-shell {
    width: min(100% - 30px, 1180px);
  }

  .hero-shell {
    padding: 52px 0 38px;
  }

  .hero-logo {
    width: 168px;
    margin-bottom: 20px;
  }

  .hero h1 {
    font-size: 40px;
    line-height: 1.08;
  }

  .theme-line {
    margin-top: 20px;
    font-size: 21px;
  }

  .hero-copy {
    font-size: 16px;
  }

  .status-notice {
  max-width: 800px;
  margin: 24px 0 0;
  padding: 12px 14px;
  color: #4b3a36;
  background: #fff2ee;
  border-left: 3px solid var(--coral);
  font-size: 14px;
}

.hero-actions {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .hero-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 40px;
  }

  .hero-facts div,
  .hero-facts div + div {
    padding: 16px 12px;
    border-left: 0;
    border-bottom: 1px solid #cdd4d0;
  }

  .hero-facts div:nth-child(even) {
    border-left: 1px solid #cdd4d0;
  }

  .hero-facts div:last-child {
    grid-column: 1 / -1;
    border-bottom: 0;
  }

  .scene-band,
  .content-section,
  .data-band,
  .organizer-band,
  .overview-band,
  .schedule-band {
    padding: 68px 0;
  }

  .section-heading {
    margin-bottom: 32px;
  }

  .section-heading h2,
  .overview-grid h2,
  .contact-layout h2 {
    font-size: 34px;
  }

  .task-grid {
    grid-template-columns: 1fr;
  }

  .task-card {
    min-height: 0;
    padding: 28px 22px;
  }

  .task-number {
    top: 22px;
    right: 22px;
    font-size: 26px;
  }

  .task-card h3 {
    padding-right: 28px;
    font-size: 22px;
  }

  .metric-row {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .timeline li {
    grid-template-columns: 1fr;
    gap: 5px;
    padding: 16px 0;
  }

  .timeline-major time,
  .timeline-major span,
  .timeline-conference time,
  .timeline-conference span {
    padding-right: 12px;
    padding-left: 12px;
  }

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

  .organizer-grid article {
    min-height: 0;
  }

  .contact-band {
    padding: 64px 0;
  }

  .contact-actions {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}