:root {
  color-scheme: light;
  --ink: #17201b;
  --muted: #68746e;
  --paper: #f6f3ea;
  --surface: #fffdf6;
  --line: #ded7c6;
  --green: #16745f;
  --green-2: #0c4f42;
  --coral: #d75f42;
  --gold: #c8932e;
  --blue: #2d6f9f;
  --shadow: 0 22px 55px rgba(43, 50, 43, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  background:
    linear-gradient(90deg, rgba(22, 116, 95, 0.07) 1px, transparent 1px),
    linear-gradient(rgba(22, 116, 95, 0.05) 1px, transparent 1px),
    linear-gradient(180deg, #fbf8ee 0%, var(--paper) 52%, #eef3ee 100%);
  background-size: 34px 34px, 34px 34px, auto;
}

body.nav-open {
  overflow: hidden;
}

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

button,
input {
  font: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 20px;
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 16px 0;
  background: rgba(246, 243, 234, 0.82);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 8px;
  color: #fffdf6;
  background: linear-gradient(135deg, var(--green), var(--blue));
  font-weight: 800;
  box-shadow: 0 10px 24px rgba(22, 116, 95, 0.22);
}

.brand strong,
.brand small {
  display: block;
  line-height: 1.1;
}

.brand strong {
  font-size: 1rem;
}

.brand small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 0.76rem;
}

.site-nav {
  justify-self: end;
  display: flex;
  gap: 6px;
  padding: 6px;
  border: 1px solid rgba(222, 215, 198, 0.8);
  border-radius: 8px;
  background: rgba(255, 253, 246, 0.72);
}

.site-nav a {
  padding: 10px 13px;
  border-radius: 6px;
  color: #344139;
  font-size: 0.92rem;
}

.site-nav a:hover {
  color: var(--green-2);
  background: rgba(22, 116, 95, 0.09);
}

.menu-button {
  display: none;
  justify-self: end;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.menu-button span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: var(--ink);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(420px, 1.12fr);
  align-items: center;
  gap: 42px;
  width: min(1180px, calc(100% - 32px));
  min-height: calc(100vh - 74px);
  margin: 0 auto;
  padding: 36px 0 70px;
}

.hero-copy {
  min-width: 0;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--green);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 18px;
  font-size: clamp(3.4rem, 8vw, 7.8rem);
  line-height: 0.92;
  letter-spacing: 0;
}

.lead {
  max-width: 620px;
  color: #465149;
  font-size: clamp(1.08rem, 2vw, 1.35rem);
  line-height: 1.8;
}

.hero-actions,
.card-actions,
.timer-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.button,
.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border: 1px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.button {
  padding: 0 18px;
  font-weight: 800;
}

.button:hover,
.icon-button:hover {
  transform: translateY(-1px);
}

.button.primary {
  color: #fffdf6;
  background: var(--green-2);
  box-shadow: 0 14px 28px rgba(12, 79, 66, 0.2);
}

.button.secondary,
.icon-button {
  color: var(--green-2);
  border-color: var(--line);
  background: var(--surface);
}

.icon-button {
  width: 44px;
  padding: 0;
  font-size: 1.35rem;
  font-weight: 800;
}

.brain-stage {
  position: relative;
  min-height: 520px;
  overflow: hidden;
  border: 1px solid rgba(222, 215, 198, 0.9);
  border-radius: 8px;
  background:
    radial-gradient(circle at 50% 42%, rgba(22, 116, 95, 0.16), transparent 32%),
    linear-gradient(145deg, rgba(255, 253, 246, 0.94), rgba(231, 239, 229, 0.86));
  box-shadow: var(--shadow);
}

.brain-stage::before {
  content: "";
  position: absolute;
  inset: 22px;
  border: 1px solid rgba(22, 116, 95, 0.12);
  border-radius: 8px;
  pointer-events: none;
}

#brainCanvas {
  display: block;
  width: 100%;
  height: 520px;
}

.signal-panel {
  position: absolute;
  right: 18px;
  bottom: 18px;
  left: 18px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.signal-panel div {
  padding: 14px;
  border: 1px solid rgba(222, 215, 198, 0.86);
  border-radius: 8px;
  background: rgba(255, 253, 246, 0.82);
  backdrop-filter: blur(12px);
}

.signal-panel span,
.card-head span,
.plan-list,
.capacity-form span,
.site-footer {
  color: var(--muted);
}

.signal-panel strong {
  display: block;
  margin-top: 4px;
  color: var(--ink);
  font-size: 1.55rem;
}

.section {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 86px 0;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 30px;
}

.section-heading h2,
.contact-inner h2 {
  margin-bottom: 12px;
  font-size: clamp(2rem, 4vw, 4rem);
  line-height: 1;
  letter-spacing: 0;
}

.section-heading p:not(.eyebrow) {
  color: var(--muted);
  line-height: 1.8;
}

.capacity-layout,
.training-grid,
.game-grid {
  display: grid;
  gap: 16px;
}

.capacity-layout {
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.82fr);
}

.capacity-form,
.score-board,
.training-card,
.game-card,
.contact-inner {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 253, 246, 0.84);
  box-shadow: 0 16px 38px rgba(43, 50, 43, 0.1);
}

.capacity-form {
  display: grid;
  gap: 18px;
  padding: 24px;
}

.capacity-form label {
  display: grid;
  grid-template-columns: 96px 1fr 44px;
  align-items: center;
  gap: 16px;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--green);
}

.capacity-form output {
  color: var(--green-2);
  font-weight: 800;
  text-align: right;
}

.score-board {
  display: grid;
  grid-template-columns: 190px 1fr;
  align-items: center;
  gap: 20px;
  padding: 24px;
}

.score-ring {
  display: grid;
  place-items: center;
  width: 168px;
  height: 168px;
  border-radius: 50%;
  background:
    radial-gradient(circle at center, var(--surface) 58%, transparent 59%),
    conic-gradient(var(--green) calc(var(--score) * 1%), #e3dece 0);
}

.score-ring span {
  color: var(--green-2);
  font-size: 3rem;
  font-weight: 900;
}

.score-board h3 {
  margin-bottom: 10px;
  font-size: 1.45rem;
}

.score-board p {
  color: var(--muted);
  line-height: 1.75;
}

.training-grid {
  grid-template-columns: 1.15fr 0.85fr 1fr;
}

.training-card,
.game-card {
  display: flex;
  flex-direction: column;
  min-height: 360px;
  padding: 20px;
}

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.chip {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border: 1px solid rgba(22, 116, 95, 0.16);
  border-radius: 999px;
  background: rgba(22, 116, 95, 0.08);
  font-size: 0.82rem;
  font-weight: 800;
}

.memory-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(52px, 1fr));
  gap: 8px;
  margin: auto 0 18px;
}

.memory-cell {
  aspect-ratio: 1;
  border: 1px solid #d7d0bf;
  border-radius: 8px;
  background: #f1ecdc;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease, border-color 120ms ease;
}

.memory-cell.is-lit {
  border-color: rgba(215, 95, 66, 0.55);
  background: linear-gradient(135deg, var(--coral), var(--gold));
}

.memory-cell.is-picked {
  border-color: var(--green);
  background: rgba(22, 116, 95, 0.18);
}

.memory-cell.is-wrong {
  border-color: var(--coral);
  background: rgba(215, 95, 66, 0.2);
}

.card-actions {
  justify-content: space-between;
}

.timer-card {
  align-items: stretch;
}

.timer-display {
  display: grid;
  place-items: center;
  flex: 1;
  min-height: 190px;
  border: 1px solid rgba(22, 116, 95, 0.12);
  border-radius: 8px;
  color: var(--green-2);
  background:
    linear-gradient(90deg, rgba(22, 116, 95, 0.08) 1px, transparent 1px),
    linear-gradient(rgba(22, 116, 95, 0.07) 1px, transparent 1px),
    #f7f3e8;
  background-size: 22px 22px;
  font-size: clamp(3rem, 7vw, 4.8rem);
  font-weight: 900;
}

.timer-controls {
  justify-content: center;
  margin-top: 18px;
}

.plan-list {
  display: grid;
  gap: 14px;
  margin: auto 0 0;
  padding: 0;
  list-style: none;
}

.plan-list li {
  padding: 14px 0;
  border-bottom: 1px solid rgba(222, 215, 198, 0.86);
}

.game-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.game-card {
  min-height: 330px;
}

.reaction-pad,
.stroop-word,
.digit-display,
.search-target {
  display: grid;
  place-items: center;
  border: 1px solid rgba(22, 116, 95, 0.12);
  border-radius: 8px;
  background: #f7f3e8;
}

.reaction-pad {
  flex: 1;
  min-height: 170px;
  color: var(--green-2);
  cursor: pointer;
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  font-weight: 900;
  transition: background 160ms ease, color 160ms ease, transform 160ms ease;
}

.reaction-pad.is-waiting {
  color: #fffdf6;
  background: var(--coral);
}

.reaction-pad.is-ready {
  color: #fffdf6;
  background: var(--green);
}

.reaction-pad:disabled {
  cursor: default;
}

.stroop-word {
  min-height: 118px;
  margin-bottom: 14px;
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 900;
}

.choice-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.choice-row button {
  min-height: 42px;
}

.digit-display {
  min-height: 128px;
  margin-bottom: 14px;
  color: var(--green-2);
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 900;
}

.inline-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
}

.inline-form input {
  min-width: 0;
  min-height: 44px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: var(--surface);
}

.search-target {
  min-height: 58px;
  margin-bottom: 12px;
  grid-template-columns: auto auto;
  gap: 8px;
  color: var(--muted);
}

.search-target strong {
  color: var(--green-2);
  font-size: 1.8rem;
}

.symbol-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 6px;
  margin-bottom: 12px;
}

.symbol-cell {
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  border: 1px solid #d7d0bf;
  border-radius: 8px;
  color: var(--ink);
  background: #f1ecdc;
  cursor: pointer;
  font-size: 1.25rem;
  font-weight: 900;
}

.symbol-cell.is-found {
  color: #fffdf6;
  border-color: var(--green);
  background: var(--green);
}

.symbol-cell.is-miss {
  border-color: var(--coral);
  background: rgba(215, 95, 66, 0.2);
}

.game-status {
  min-height: 48px;
  margin: auto 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.contact-section {
  padding-top: 40px;
}

.contact-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 28px;
  padding: clamp(24px, 5vw, 44px);
  background:
    linear-gradient(135deg, rgba(12, 79, 66, 0.94), rgba(45, 111, 159, 0.88)),
    var(--green-2);
  color: #fffdf6;
}

.contact-inner .eyebrow,
.contact-inner h2 {
  color: #fffdf6;
}

.contact-inner .button.primary {
  color: var(--green-2);
  background: #fffdf6;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 34px 0 42px;
  border-top: 1px solid var(--line);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 520ms ease, transform 520ms ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 980px) {
  .hero,
  .capacity-layout,
  .training-grid,
  .game-grid,
  .contact-inner {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 24px;
  }

  .brain-stage {
    min-height: 430px;
  }

  #brainCanvas {
    height: 430px;
  }

  .training-card {
    min-height: 300px;
  }
}

@media (max-width: 720px) {
  .site-header {
    grid-template-columns: auto auto;
  }

  .menu-button {
    display: inline-block;
  }

  .site-nav {
    position: fixed;
    top: 72px;
    right: 16px;
    left: 16px;
    display: none;
    grid-column: 1 / -1;
    justify-self: stretch;
    padding: 8px;
    box-shadow: var(--shadow);
  }

  body.nav-open .site-nav {
    display: grid;
  }

  .site-nav a {
    padding: 14px;
  }

  h1 {
    font-size: clamp(3.1rem, 18vw, 5.6rem);
  }

  .hero {
    width: min(100% - 24px, 1180px);
    gap: 24px;
  }

  .section {
    width: min(100% - 24px, 1180px);
    padding: 62px 0;
  }

  .signal-panel {
    grid-template-columns: 1fr;
  }

  .brain-stage {
    min-height: 500px;
  }

  #brainCanvas {
    height: 500px;
  }

  .capacity-form label {
    grid-template-columns: 1fr 42px;
    gap: 10px;
  }

  .capacity-form input {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .score-board {
    grid-template-columns: 1fr;
  }

  .score-ring {
    width: 150px;
    height: 150px;
  }

  .site-footer {
    flex-direction: column;
    width: min(100% - 24px, 1180px);
  }
}

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