:root {
  color-scheme: light;
  --ink: #171a18;
  --muted: #59615c;
  --paper: #fbfaf6;
  --surface: #ffffff;
  --line: #ded9cd;
  --soft: #eff3ee;
  --accent: #cf4e3f;
  --accent-strong: #a33a30;
  --teal: #21746d;
  --gold: #c7922c;
  --shadow: 0 24px 60px rgba(23, 26, 24, 0.12);
  --radius: 8px;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(33, 116, 109, 0.10), transparent 34rem),
    linear-gradient(180deg, #fbfaf6 0%, #f4f0e8 45%, #f8f8f2 100%);
  font-family: Inter, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
}

body.menu-open {
  overflow: hidden;
}

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

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

button {
  font: inherit;
}

.skip-link {
  position: fixed;
  left: 1rem;
  top: 1rem;
  z-index: 100;
  transform: translateY(-140%);
  border-radius: var(--radius);
  background: var(--ink);
  color: #fff;
  padding: 0.65rem 0.9rem;
  transition: transform 180ms ease;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(222, 217, 205, 0.76);
  background: rgba(251, 250, 246, 0.88);
  backdrop-filter: blur(16px);
}

.site-header.is-scrolled {
  box-shadow: 0 10px 24px rgba(23, 26, 24, 0.08);
}

.nav {
  display: flex;
  min-height: 4.25rem;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: min(100% - 2rem, var(--max-width));
  margin: 0 auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  min-width: 0;
  font-weight: 800;
}

.brand-mark {
  display: grid;
  flex: 0 0 2.25rem;
  width: 2.25rem;
  height: 2.25rem;
  place-items: center;
  border-radius: var(--radius);
  background: var(--ink);
  color: #fff;
}

.brand-text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.nav-menu a {
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 0.96rem;
  font-weight: 700;
  padding: 0.65rem 0.9rem;
  transition: background 180ms ease, color 180ms ease;
}

.nav-menu a:hover,
.nav-menu a:focus-visible,
.nav-menu a.is-active {
  background: var(--ink);
  color: #fff;
  outline: none;
}

.nav-toggle {
  display: none;
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 1.15rem;
  height: 2px;
  margin: 0.27rem auto;
  border-radius: 999px;
  background: currentColor;
  transition: transform 180ms ease, opacity 180ms ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(0.44rem) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-0.44rem) rotate(-45deg);
}

.section {
  width: min(100% - 2rem, var(--max-width));
  margin: 0 auto;
  padding: 5.5rem 0;
}

.hero {
  display: grid;
  min-height: calc(100svh - 14rem);
  align-items: center;
  grid-template-columns: minmax(0, 1fr) minmax(22rem, 0.92fr);
  gap: 3.75rem;
  padding-top: 3.35rem;
  padding-bottom: 3.35rem;
}

.hero-copy {
  max-width: 43rem;
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--teal);
  font-size: 0.8rem;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 1.25rem;
  font-size: 4.35rem;
  line-height: 1.05;
  letter-spacing: 0;
  overflow-wrap: anywhere;
}

h2 {
  margin-bottom: 0.8rem;
  font-size: 2.45rem;
  line-height: 1.14;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 0.7rem;
  font-size: 1.18rem;
  line-height: 1.25;
  letter-spacing: 0;
}

.hero-lede,
.section-heading p,
.about-copy p {
  color: var(--muted);
  font-size: 1.08rem;
}

.hero-lede {
  max-width: 39rem;
  margin-bottom: 1.7rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-weight: 800;
  padding: 0.7rem 1rem;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
  outline: none;
}

.button-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 16px 30px rgba(207, 78, 63, 0.22);
}

.button-primary:hover,
.button-primary:focus-visible {
  background: var(--accent-strong);
}

.button-secondary {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
  max-width: 35rem;
  margin: 0;
}

.hero-metrics div {
  min-height: 5.5rem;
  border-top: 3px solid var(--ink);
  background: rgba(255, 255, 255, 0.64);
  padding: 0.8rem 0.9rem;
}

.hero-metrics dt {
  font-size: 1.55rem;
  font-weight: 900;
  line-height: 1;
}

.hero-metrics dd {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.hero-visual {
  position: relative;
  margin: 0;
}

.hero-visual::before {
  position: absolute;
  inset: 1.1rem -1.1rem -1.1rem 1.1rem;
  z-index: -1;
  border: 2px solid rgba(33, 116, 109, 0.34);
  border-radius: var(--radius);
  content: "";
}

.hero-visual img {
  aspect-ratio: 7 / 5;
  width: 100%;
  border: 1px solid rgba(23, 26, 24, 0.16);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  object-fit: cover;
}

.section-plain,
.section-tinted,
.about {
  border-top: 1px solid var(--line);
}

.section-heading {
  max-width: 44rem;
  margin-bottom: 2rem;
}

.project-grid,
.resource-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.project-card,
.resource-card,
.about-panel {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 12px 32px rgba(23, 26, 24, 0.06);
}

.project-card {
  display: flex;
  min-height: 20rem;
  flex-direction: column;
  padding: 1.25rem;
}

.project-card p,
.resource-card p {
  color: var(--muted);
}

.card-index {
  width: fit-content;
  margin-bottom: 2.2rem;
  border-bottom: 3px solid var(--gold);
  color: var(--ink);
  font-size: 1.35rem;
  font-weight: 900;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: auto 0 0;
  padding: 0;
  list-style: none;
}

.tag-list li {
  border: 1px solid rgba(23, 26, 24, 0.14);
  border-radius: var(--radius);
  background: var(--soft);
  color: #32403a;
  font-size: 0.8rem;
  font-weight: 800;
  padding: 0.34rem 0.55rem;
}

.section-tinted {
  width: 100%;
  max-width: none;
  background:
    linear-gradient(90deg, rgba(33, 116, 109, 0.10), transparent 42%),
    #f2f5ef;
}

.section-tinted > .section-heading,
.section-tinted > .resource-toolbar,
.section-tinted > .resource-grid {
  width: min(100% - 2rem, var(--max-width));
  margin-left: auto;
  margin-right: auto;
}

.resource-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-bottom: 1.25rem;
}

.resource-filter {
  min-height: 2.55rem;
  border: 1px solid rgba(23, 26, 24, 0.16);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--muted);
  cursor: pointer;
  font-weight: 800;
  padding: 0.55rem 0.85rem;
  transition: background 180ms ease, color 180ms ease, transform 180ms ease;
}

.resource-filter:hover,
.resource-filter:focus-visible,
.resource-filter.is-active {
  background: var(--teal);
  color: #fff;
  outline: none;
}

.resource-filter:hover,
.resource-filter:focus-visible {
  transform: translateY(-1px);
}

.resource-card {
  min-height: 13.5rem;
  padding: 1.2rem;
  transition: transform 180ms ease, opacity 180ms ease;
}

.resource-card.is-hidden {
  display: none;
}

.resource-type {
  display: inline-flex;
  margin-bottom: 1.15rem;
  border-radius: var(--radius);
  background: rgba(207, 78, 63, 0.11);
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 900;
  padding: 0.3rem 0.5rem;
}

.resource-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.45rem;
  margin-top: 0.25rem;
  border: 1px solid rgba(23, 26, 24, 0.16);
  border-radius: var(--radius);
  background: var(--ink);
  color: #fff;
  cursor: pointer;
  font-weight: 900;
  padding: 0.55rem 0.8rem;
  transition: background 180ms ease, transform 180ms ease;
}

.resource-action:hover,
.resource-action:focus-visible {
  background: var(--teal);
  outline: none;
  transform: translateY(-1px);
}

.game-panel {
  width: min(100% - 2rem, var(--max-width));
  margin: 1.25rem auto 0;
  border: 1px solid rgba(23, 26, 24, 0.16);
  border-radius: var(--radius);
  background: #111715;
  color: #fff;
  box-shadow: var(--shadow);
  overflow: hidden;
  scroll-margin-top: 5.25rem;
}

.game-panel[hidden] {
  display: none;
}

.game-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 1.25rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  background:
    linear-gradient(90deg, rgba(33, 116, 109, 0.30), transparent 62%),
    #151d1a;
}

.game-panel-header h2 {
  margin-bottom: 0;
  font-size: 1.5rem;
}

.game-status {
  margin: 0;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.08);
  color: #e9f2ed;
  font-size: 0.88rem;
  font-weight: 900;
  padding: 0.45rem 0.65rem;
}

.game-shell {
  padding: 1rem;
}

.game-hud {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.55rem;
  margin-bottom: 0.75rem;
}

.game-stat {
  min-width: 0;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.07);
  padding: 0.65rem 0.75rem;
}

.game-stat span {
  display: block;
  color: rgba(255, 255, 255, 0.66);
  font-size: 0.72rem;
  font-weight: 900;
}

.game-stat strong {
  display: block;
  overflow: hidden;
  color: #fff;
  font-size: 1.25rem;
  line-height: 1.12;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.game-canvas-wrap {
  position: relative;
  aspect-ratio: 16 / 9;
  width: 100%;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius);
  background: #0b1110;
}

#survival-canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: grab;
  touch-action: none;
}

#survival-canvas.is-dragging {
  cursor: grabbing;
}

.game-overlay {
  position: absolute;
  inset: auto 1rem 1rem 1rem;
  display: grid;
  gap: 0.2rem;
  max-width: 24rem;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius);
  background: rgba(17, 23, 21, 0.84);
  color: #fff;
  padding: 0.8rem 0.9rem;
  pointer-events: none;
}

.game-overlay.is-hidden {
  display: none;
}

.game-overlay strong {
  font-size: 1rem;
}

.game-overlay span {
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.9rem;
}

.game-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 0.8rem;
}

.game-controls .button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
  transform: none;
}

.about {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(19rem, 0.55fr);
  gap: 2rem;
  align-items: start;
}

.about-copy {
  max-width: 46rem;
}

.about-panel {
  padding: 1.25rem;
}

.about-panel ul {
  display: grid;
  gap: 0.75rem;
  margin: 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: min(100% - 2rem, var(--max-width));
  margin: 0 auto;
  border-top: 1px solid var(--line);
  color: var(--muted);
  padding: 1.5rem 0 2.2rem;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  flex: 0 0 auto;
  border-bottom: 2px solid var(--accent);
  color: var(--ink);
  font-weight: 800;
}

@media (max-width: 980px) {
  .hero,
  .about {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    gap: 2.25rem;
    padding-top: 3rem;
    padding-bottom: 3rem;
  }

  h1 {
    font-size: 3.25rem;
  }

  h2 {
    font-size: 2.05rem;
  }

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

  .game-hud {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .game-stat-wide {
    grid-column: span 2;
  }

  .hero-visual {
    max-width: 40rem;
  }
}

@media (max-width: 720px) {
  .nav {
    min-height: 3.85rem;
  }

  .brand-text {
    max-width: 12rem;
  }

  .nav-toggle {
    display: block;
  }

  .nav-menu {
    position: fixed;
    top: 3.85rem;
    left: 1rem;
    right: 1rem;
    display: grid;
    gap: 0.25rem;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.96);
    box-shadow: var(--shadow);
    padding: 0.5rem;
    transform: translateY(-0.75rem);
    opacity: 0;
    pointer-events: none;
    transition: opacity 180ms ease, transform 180ms ease;
  }

  .nav-menu.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-menu a {
    padding: 0.82rem 0.9rem;
  }

  .section {
    padding: 3.35rem 0;
  }

  .hero {
    gap: 1.45rem;
    padding-top: 1.65rem;
    padding-bottom: 2rem;
  }

  h1 {
    margin-bottom: 1rem;
    font-size: 2.75rem;
  }

  h2 {
    font-size: 1.85rem;
  }

  .hero-lede,
  .section-heading p,
  .about-copy p {
    font-size: 1rem;
  }

  .hero-metrics,
  .project-grid,
  .resource-grid {
    grid-template-columns: 1fr;
  }

  .hero-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.55rem;
  }

  .hero-metrics div {
    min-height: 4.1rem;
    padding: 0.65rem;
  }

  .hero-metrics dt {
    font-size: 1.25rem;
  }

  .hero-metrics dd {
    font-size: 0.78rem;
  }

  .hero-visual img {
    max-height: 12rem;
  }

  .game-panel {
    width: min(100% - 1.25rem, var(--max-width));
  }

  .game-panel-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .game-status {
    width: 100%;
  }

  .game-shell {
    padding: 0.65rem;
  }

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

  .game-stat-wide {
    grid-column: span 2;
  }

  .game-controls .button {
    flex: 1 1 9rem;
  }

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

@media (max-width: 420px) {
  .nav,
  .section,
  .section-tinted > .section-heading,
  .section-tinted > .resource-toolbar,
  .section-tinted > .resource-grid,
  .site-footer {
    width: min(100% - 1.25rem, var(--max-width));
  }

  .brand-text {
    max-width: 9.8rem;
  }

  h1 {
    font-size: 2.04rem;
  }

  .button,
  .hero-actions {
    width: 100%;
  }

  .hero-visual::before {
    inset: 0.7rem -0.45rem -0.45rem 0.7rem;
  }

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

  .resource-filter {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}