:root {
  color-scheme: light;
  --ink: #102326;
  --muted: #5d6f72;
  --line: #d6e4df;
  --paper: #fbfffd;
  --paper-strong: #ffffff;
  --teal: #0b948b;
  --teal-dark: #143331;
  --mint: #dff4ee;
  --amber: #f2bb46;
  --coral: #e85e4f;
  --blue: #3e78b2;
  --violet: #7357b8;
  --shadow: 0 24px 70px rgba(16, 35, 38, 0.16);
  --soft-shadow: 0 14px 38px rgba(16, 35, 38, 0.1);
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
}

body {
  background:
    radial-gradient(circle at 12% 18%, rgba(242, 187, 70, 0.28), transparent 28%),
    radial-gradient(circle at 88% 72%, rgba(62, 120, 178, 0.18), transparent 31%),
    linear-gradient(135deg, #edf7f2 0%, #f7fbf4 52%, #eef3f7 100%);
  color: var(--ink);
  margin: 0;
  min-height: 100svh;
}

body::before {
  background-image:
    linear-gradient(rgba(16, 35, 38, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 35, 38, 0.05) 1px, transparent 1px);
  background-size: 36px 36px;
  content: "";
  inset: 0;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.5), transparent 70%);
  pointer-events: none;
  position: fixed;
}

a,
button {
  font: inherit;
}

button {
  cursor: pointer;
}

[hidden] {
  display: none !important;
}

.sr-only {
  clip: rect(0 0 0 0);
  border: 0;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  white-space: nowrap;
  width: 1px;
}

.app-shell {
  isolation: isolate;
  min-height: 100svh;
  position: relative;
}

.home-chrome {
  align-items: center;
  display: flex;
  gap: 12px;
  justify-content: space-between;
  left: 50%;
  max-width: 1200px;
  padding: 18px clamp(16px, 4vw, 44px);
  position: fixed;
  top: 0;
  transform: translateX(-50%);
  transition: filter 160ms ease, opacity 160ms ease;
  width: 100%;
  z-index: 8;
}

.brand-pill,
.language-switch {
  align-items: center;
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(214, 228, 223, 0.92);
  border-radius: 8px;
  box-shadow: 0 10px 26px rgba(16, 35, 38, 0.08);
  display: inline-flex;
}

.brand-pill {
  color: var(--ink);
  gap: 10px;
  padding: 8px 12px;
  text-decoration: none;
}

.brand-mark {
  align-items: center;
  background: var(--amber);
  border-radius: 6px;
  color: #1d2728;
  display: inline-flex;
  font-size: 0.8rem;
  font-weight: 900;
  height: 34px;
  justify-content: center;
  width: 34px;
}

.brand-pill span:last-child {
  font-weight: 900;
  letter-spacing: 0;
}

.language-switch {
  overflow: hidden;
}

.language-option {
  background: transparent;
  border: 0;
  color: var(--muted);
  font-weight: 900;
  min-height: 44px;
  min-width: 52px;
  padding: 0 14px;
}

.language-option[aria-pressed="true"] {
  background: var(--teal);
  color: #ffffff;
}

.category-stage,
.lab-stage {
  transition: filter 160ms ease, opacity 160ms ease, transform 220ms ease;
}

.category-stage {
  align-items: center;
  display: grid;
  min-height: 100svh;
  padding: 100px clamp(18px, 5vw, 64px) 52px;
}

.track-nav {
  display: grid;
  gap: clamp(14px, 2.2vw, 28px);
  grid-template-columns: repeat(5, minmax(0, 1fr));
  margin: 0 auto;
  max-width: 1220px;
  width: 100%;
}

.track-tile {
  align-items: center;
  animation: tile-in 620ms cubic-bezier(0.2, 0.9, 0.2, 1.08) both;
  animation-delay: var(--tile-delay);
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(214, 228, 223, 0.94);
  border-radius: 8px;
  box-shadow: var(--soft-shadow);
  color: var(--ink);
  display: flex;
  font-size: 1.5rem;
  font-weight: 950;
  justify-content: center;
  letter-spacing: 0;
  line-height: 1.08;
  max-width: 100%;
  min-height: clamp(104px, 16vw, 164px);
  min-width: 0;
  overflow-wrap: anywhere;
  overflow: hidden;
  padding: 20px;
  position: relative;
  text-align: center;
  text-transform: lowercase;
  text-wrap: balance;
  transform-origin: 50% 60%;
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease, background 160ms ease;
  word-break: normal;
}

.track-tile::before {
  background-image: var(--tile-art);
  background-position: 82% 54%;
  background-repeat: no-repeat;
  background-size: min(78%, 170px) auto;
  content: "";
  inset: 0;
  opacity: 0.075;
  position: absolute;
  transform: rotate(-4deg) scale(1.08);
  transition: opacity 160ms ease, transform 180ms ease;
}

.track-label {
  position: relative;
  z-index: 1;
}

.track-tile:hover::before,
.track-tile:focus-visible::before {
  opacity: 0.12;
  transform: rotate(-2deg) scale(1.14);
}

.track-tile[data-track="All"] {
  --tile-art: url("assets/home-categories/all.svg");
}

.track-tile[data-track="Robotics"] {
  --tile-art: url("assets/home-categories/robotics.svg");
}

.track-tile[data-track="Drones"] {
  --tile-art: url("assets/home-categories/drones.svg");
}

.track-tile[data-track="Particle Detectors"] {
  --tile-art: url("assets/home-categories/particle-detectors.svg");
}

.track-tile[data-track="Physics"] {
  --tile-art: url("assets/home-categories/physics.svg");
}

.track-tile[data-track="Chemistry"] {
  --tile-art: url("assets/home-categories/chemistry.svg");
}

.track-tile[data-track="Biology"] {
  --tile-art: url("assets/home-categories/biology.svg");
}

.track-tile[data-track="Geology"] {
  --tile-art: url("assets/home-categories/geology.svg");
}

.track-tile[data-track="Architecture"] {
  --tile-art: url("assets/home-categories/architecture.svg");
}

.track-tile[data-track="Mechanics"] {
  --tile-art: url("assets/home-categories/mechanics.svg");
}

.track-tile:nth-child(3n + 1) {
  border-top: 5px solid var(--teal);
}

.track-tile:nth-child(3n + 2) {
  border-top: 5px solid var(--amber);
}

.track-tile:nth-child(3n) {
  border-top: 5px solid var(--blue);
}

.track-tile:hover,
.track-tile:focus-visible {
  background: #ffffff;
  border-color: rgba(11, 148, 139, 0.58);
  box-shadow: 0 26px 56px rgba(16, 35, 38, 0.16);
  outline: 0;
  transform: translateY(-7px) scale(1.025);
}

.lab-stage {
  margin: 0 auto;
  max-width: 1180px;
  padding: 110px clamp(16px, 4vw, 40px) 60px;
}

.stage-toolbar {
  align-items: center;
  display: flex;
  gap: 14px;
  margin-bottom: 22px;
}

.stage-toolbar h2 {
  font-size: clamp(2.2rem, 7vw, 5.4rem);
  letter-spacing: 0;
  line-height: 0.9;
  margin: 0;
  overflow-wrap: anywhere;
  text-transform: lowercase;
  text-wrap: balance;
}

.back-button {
  align-items: center;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--soft-shadow);
  color: var(--ink);
  display: inline-flex;
  font-size: 1.6rem;
  font-weight: 900;
  height: 52px;
  justify-content: center;
  width: 58px;
}

.back-button:hover,
.back-button:focus-visible {
  border-color: var(--teal);
  outline: 0;
}

.lab-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.lab-card {
  animation: card-in 420ms ease both;
  animation-delay: var(--card-delay);
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid rgba(214, 228, 223, 0.96);
  border-radius: 8px;
  box-shadow: 0 18px 42px rgba(16, 35, 38, 0.08);
  color: var(--ink);
  display: grid;
  gap: 14px;
  min-height: 210px;
  padding: 22px;
  text-align: left;
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease, background 160ms ease;
}

.lab-card span,
.detail-hero span,
.detail-section span,
.detail-meta span {
  color: #00766f;
  font-size: 0.76rem;
  font-weight: 950;
  letter-spacing: 0;
  text-transform: uppercase;
}

.lab-card strong {
  display: block;
  font-size: clamp(1.15rem, 2vw, 1.55rem);
  line-height: 1.05;
}

.lab-card p {
  color: var(--muted);
  font-weight: 650;
  line-height: 1.45;
  margin: 0;
}

.lab-card:hover,
.lab-card:focus-visible {
  background: #ffffff;
  border-color: rgba(11, 148, 139, 0.62);
  box-shadow: 0 30px 68px rgba(16, 35, 38, 0.16);
  outline: 0;
  transform: translateY(-5px);
}

.empty-state {
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--muted);
  font-weight: 800;
  margin: 0;
  padding: 18px;
}

.lab-focus {
  display: grid;
  inset: 0;
  padding: clamp(16px, 4vw, 42px);
  place-items: center;
  position: fixed;
  z-index: 20;
}

.lab-focus-backdrop {
  background: rgba(12, 30, 32, 0.26);
  border: 0;
  backdrop-filter: blur(7px) saturate(0.78);
  inset: 0;
  position: absolute;
  -webkit-backdrop-filter: blur(7px) saturate(0.78);
}

.lab-detail {
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid rgba(214, 228, 223, 0.98);
  border-radius: 8px;
  box-shadow: var(--shadow);
  display: grid;
  gap: 16px;
  max-height: min(850px, 88svh);
  max-width: 880px;
  opacity: 0;
  overflow: auto;
  padding: clamp(22px, 4vw, 34px);
  position: relative;
  transform: translateY(18px) scale(0.97);
  transition: opacity 160ms ease, transform 180ms ease;
  width: min(100%, 980px);
  z-index: 1;
}

.lab-focus.is-visible .lab-detail {
  opacity: 1;
  transform: translateY(0) scale(1);
}

body.detail-open .home-chrome,
body.detail-open .category-stage,
body.detail-open .lab-stage {
  filter: blur(7px) saturate(0.78);
  pointer-events: none;
}

.detail-close {
  align-items: center;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  display: inline-flex;
  font-size: 1.4rem;
  font-weight: 900;
  height: 42px;
  justify-content: center;
  position: absolute;
  right: 16px;
  top: 16px;
  width: 42px;
}

.detail-close:hover,
.detail-close:focus-visible {
  border-color: var(--coral);
  outline: 0;
}

.detail-hero {
  border-bottom: 1px solid var(--line);
  display: grid;
  gap: 10px;
  padding-right: 54px;
  padding-bottom: 16px;
}

.detail-hero h2 {
  font-size: clamp(2rem, 4.4vw, 3.7rem);
  letter-spacing: 0;
  line-height: 1;
  margin: 0;
}

.detail-hero p,
.detail-section p,
.safety-note {
  color: var(--muted);
  font-size: 1.03rem;
  font-weight: 680;
  line-height: 1.55;
  margin: 0;
  max-width: 70ch;
}

.detail-mission {
  background: #fff8e8;
  border: 1px solid rgba(242, 187, 70, 0.55);
  border-radius: 8px;
  color: #4e5960;
  padding: 10px 12px;
}

.detail-actions {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 6px;
}

.primary-button,
.mode-links a {
  align-items: center;
  border-radius: 8px;
  display: inline-flex;
  font-weight: 950;
  min-height: 44px;
  padding: 0 16px;
  text-decoration: none;
}

.primary-button {
  background: var(--teal);
  color: #ffffff;
}

.primary-button:hover,
.primary-button:focus-visible {
  background: #087d76;
  outline: 0;
}

.mode-links {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 8px;
}

.mode-links a {
  background: #ffffff;
  border: 1px solid var(--line);
  color: var(--ink);
}

.mode-links a:hover,
.mode-links a:focus-visible {
  border-color: var(--teal);
  color: #006f69;
  outline: 0;
}

.mode-picker {
  position: relative;
}

.mode-picker summary {
  align-items: center;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  display: inline-flex;
  font-weight: 950;
  list-style: none;
  min-height: 44px;
  padding: 0 16px;
}

.mode-picker summary::-webkit-details-marker {
  display: none;
}

.mode-picker summary::after {
  content: "+";
  margin-left: 10px;
}

.mode-picker[open] summary {
  border-color: rgba(11, 148, 139, 0.62);
}

.mode-picker[open] summary::after {
  content: "-";
}

.mode-picker .mode-links {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--soft-shadow);
  display: grid;
  gap: 8px;
  left: 0;
  min-width: 180px;
  padding: 8px;
  position: absolute;
  top: calc(100% + 8px);
  z-index: 4;
}

.mode-picker .mode-links a {
  justify-content: center;
  width: 100%;
}

.detail-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.detail-facts span {
  align-items: center;
  background: #eef6f4;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink);
  display: inline-flex;
  font-weight: 850;
  gap: 7px;
  min-height: 36px;
  padding: 7px 11px;
}

.detail-facts strong {
  color: #00766f;
  font-size: 0.72rem;
  font-weight: 950;
  text-transform: uppercase;
}

.detail-accordions {
  display: grid;
  gap: 8px;
}

.detail-accordion {
  background: rgba(251, 255, 253, 0.9);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.detail-accordion summary {
  align-items: center;
  color: var(--ink);
  display: flex;
  font-weight: 950;
  justify-content: space-between;
  list-style: none;
  min-height: 50px;
  padding: 0 14px;
}

.detail-accordion summary::-webkit-details-marker {
  display: none;
}

.detail-accordion summary::after {
  color: #00766f;
  content: "+";
  font-size: 1.25rem;
  line-height: 1;
}

.detail-accordion[open] summary {
  border-bottom: 1px solid var(--line);
}

.detail-accordion[open] summary::after {
  content: "-";
}

.detail-accordion-body {
  padding: 14px 16px 16px;
}

.detail-accordion-body p,
.detail-accordion-body ul,
.detail-accordion-body ol {
  color: var(--muted);
  font-weight: 680;
  line-height: 1.45;
  margin: 0;
}

.detail-accordion-body ul,
.detail-accordion-body ol {
  display: grid;
  gap: 8px;
  padding-left: 20px;
}

.detail-meta {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.detail-meta div {
  background: #eef6f4;
  border: 1px solid var(--line);
  border-radius: 8px;
  display: grid;
  gap: 6px;
  min-height: 78px;
  padding: 12px;
}

.detail-meta strong {
  font-size: 1rem;
  line-height: 1.2;
}

.detail-question {
  background: #fff8e8;
  border-color: rgba(242, 187, 70, 0.55);
}

.detail-columns {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.detail-section,
.safety-note {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  display: grid;
  gap: 10px;
  padding: 16px;
}

.detail-section ul,
.detail-section ol {
  color: var(--muted);
  display: grid;
  gap: 8px;
  font-weight: 680;
  line-height: 1.45;
  margin: 0;
  padding-left: 20px;
}

.safety-note {
  background: #fef3ef;
  border-color: rgba(232, 94, 79, 0.28);
}

@keyframes tile-in {
  from {
    opacity: 0;
    transform: translateY(34px) rotateX(8deg) scale(0.94);
  }
  to {
    opacity: 1;
    transform: translateY(0) rotateX(0) scale(1);
  }
}

@keyframes card-in {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 980px) {
  .track-nav {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

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

@media (max-width: 680px) {
  .home-chrome {
    padding: 12px;
  }

  .brand-pill {
    padding: 6px 8px;
  }

  .brand-mark {
    height: 30px;
    width: 30px;
  }

  .language-option {
    min-height: 40px;
    min-width: 46px;
    padding: 0 10px;
  }

  .category-stage {
    align-content: center;
    padding: 82px 12px 24px;
  }

  .track-nav {
    gap: 10px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .track-tile {
    font-size: 1.05rem;
    min-height: 92px;
    padding: 12px;
  }

  .lab-stage {
    padding: 84px 12px 28px;
  }

  .stage-toolbar {
    margin-bottom: 14px;
  }

  .stage-toolbar h2 {
    font-size: clamp(2rem, 14vw, 3.4rem);
  }

  .back-button {
    height: 46px;
    width: 50px;
  }

  .lab-grid {
    gap: 12px;
    grid-template-columns: 1fr;
  }

  .lab-card {
    min-height: 170px;
    padding: 18px;
  }

  .lab-focus {
    align-items: end;
    padding: 10px;
  }

  .lab-detail {
    border-radius: 8px 8px 0 0;
    max-height: 92svh;
    padding: 20px 16px 24px;
  }

  .detail-hero {
    padding-right: 44px;
  }

  .detail-hero h2 {
    font-size: clamp(1.9rem, 12vw, 3rem);
  }

  .detail-meta {
    grid-template-columns: 1fr;
  }

  .detail-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .primary-button,
  .mode-picker summary {
    justify-content: center;
    width: 100%;
  }

  .mode-picker .mode-links {
    position: static;
    margin-top: 8px;
  }
}