:root {
  color-scheme: dark;
  --ink-950: #05111b;
  --ink-900: #071722;
  --ink-800: #0a2230;
  --ink-700: #123445;
  --parchment: #f2dfb6;
  --parchment-muted: #b7c7c9;
  --gold: #c99c52;
  --gold-bright: #efd08c;
  --coral: #ed765f;
  --teal: #82c9c2;
  --line: rgba(201, 156, 82, 0.52);
  --panel: rgba(5, 17, 27, 0.86);
  --shadow: 0 22px 70px rgba(0, 0, 0, 0.45);
  --display: Georgia, "Times New Roman", serif;
  --ui: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  min-height: 100%;
  background: var(--ink-950);
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--parchment);
  font-family: var(--ui);
  background-color: var(--ink-950);
  background-image:
    linear-gradient(rgba(5, 17, 27, 0.22), rgba(5, 17, 27, 0.46)),
    url("assets/observatory-bg.png");
  background-position: center;
  background-size: cover;
  background-attachment: fixed;
}

.asset-loader {
  position: fixed;
  z-index: 100;
  inset: 0;
  display: grid;
  place-items: center;
  background: var(--ink-950);
  color: var(--parchment);
  transition: opacity 280ms ease, visibility 280ms ease;
}

.asset-loader[hidden] {
  display: none;
}

.asset-loader__content {
  display: grid;
  max-width: 320px;
  padding: 32px;
  place-items: center;
  text-align: center;
}

.asset-loader__sigil {
  position: relative;
  display: block;
  width: 64px;
  height: 64px;
  margin-bottom: 20px;
  border: 1px solid rgba(239, 208, 140, 0.66);
  border-radius: 50%;
  animation: loader-orbit 1.8s linear infinite;
}

.asset-loader__sigil::before,
.asset-loader__sigil::after {
  position: absolute;
  top: 50%;
  left: 50%;
  content: "";
  background: var(--gold-bright);
  clip-path: polygon(50% 0, 59% 41%, 100% 50%, 59% 59%, 50% 100%, 41% 59%, 0 50%, 41% 41%);
  transform: translate(-50%, -50%);
}

.asset-loader__sigil::before {
  width: 30px;
  height: 30px;
}

.asset-loader__sigil::after {
  width: 10px;
  height: 10px;
  background: var(--ink-950);
}

.asset-loader strong {
  font-family: var(--display);
  font-size: 1.55rem;
}

.asset-loader__content > span:last-of-type {
  margin-top: 9px;
  color: var(--parchment-muted);
  font-size: 0.8rem;
}

#asset-retry {
  min-height: 42px;
  margin-top: 20px;
  padding: 0 24px;
  cursor: pointer;
  border: 1px solid var(--gold);
  border-radius: 999px;
  background: transparent;
  color: var(--parchment);
  font-size: 0.82rem;
  font-weight: 700;
}

.app-shell {
  opacity: 1;
  transition: opacity 300ms ease;
}

.is-loading .app-shell {
  visibility: hidden;
  opacity: 0;
}

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

button {
  color: inherit;
  font: inherit;
}

button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--gold-bright);
  outline-offset: 4px;
}

.app-shell {
  display: flex;
  min-height: 100vh;
  flex-direction: column;
  background: radial-gradient(circle at 50% 32%, rgba(20, 58, 71, 0.34), transparent 44%);
}

.topbar {
  display: flex;
  width: 100%;
  height: 72px;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(20px, 4vw, 64px);
  border-bottom: 1px solid rgba(201, 156, 82, 0.56);
  background: rgba(4, 14, 23, 0.8);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--gold-bright);
  font-family: var(--display);
  font-size: clamp(1.3rem, 2vw, 1.75rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand-mark {
  width: 30px;
  height: 30px;
  overflow: visible;
  fill: none;
  stroke: currentColor;
  stroke-linejoin: round;
  stroke-width: 1.5;
}

.icon-button,
.result-card__close {
  display: inline-grid;
  width: 42px;
  height: 42px;
  cursor: pointer;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: rgba(7, 23, 34, 0.76);
  transition: color 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.icon-button:hover,
.result-card__close:hover {
  color: var(--gold-bright);
  border-color: var(--gold-bright);
  transform: translateY(-1px);
}

.icon-button svg,
.result-card__close svg {
  width: 21px;
  height: 21px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.sound-off {
  display: none;
}

.icon-button[aria-pressed="false"] .sound-on {
  display: none;
}

.icon-button[aria-pressed="false"] .sound-off {
  display: block;
}

.game-layout {
  display: grid;
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 42px 0 28px;
  grid-template-columns: minmax(0, 1fr) minmax(340px, 0.58fr);
  grid-template-areas:
    "intro hud"
    "play play";
  column-gap: 48px;
  row-gap: 30px;
}

.intro {
  grid-area: intro;
}

.title-lockup {
  display: flex;
  align-items: center;
  gap: 18px;
}

h1,
h2 {
  margin: 0;
  font-family: var(--display);
  font-weight: 700;
  letter-spacing: -0.03em;
}

h1 {
  font-size: clamp(2.65rem, 5vw, 4.55rem);
  line-height: 0.98;
  text-shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
}

.title-flourish {
  position: relative;
  width: 54px;
  height: 1px;
  flex: 0 0 54px;
  background: var(--gold);
}

.title-flourish::after {
  position: absolute;
  top: 50%;
  right: -4px;
  width: 8px;
  height: 8px;
  border: 1px solid var(--gold);
  content: "";
  transform: translateY(-50%) rotate(45deg);
}

.title-flourish--right {
  transform: scaleX(-1);
}

.intro > p {
  max-width: 660px;
  margin: 15px 0 22px 72px;
  color: var(--parchment-muted);
  font-size: clamp(0.95rem, 1.5vw, 1.08rem);
  line-height: 1.6;
}

.difficulty {
  display: grid;
  width: min(510px, calc(100% - 72px));
  margin-left: 72px;
  overflow: hidden;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--gold);
  border-radius: 999px;
  background: rgba(5, 17, 27, 0.82);
}

.difficulty button {
  min-height: 46px;
  cursor: pointer;
  border: 0;
  border-right: 1px solid rgba(201, 156, 82, 0.34);
  background: transparent;
  color: #d3d8d1;
  font-size: 0.94rem;
  font-weight: 650;
  letter-spacing: 0.02em;
  transition: background-color 180ms ease, color 180ms ease;
}

.difficulty button:last-child {
  border-right: 0;
}

.difficulty button:hover {
  color: var(--parchment);
  background: rgba(201, 156, 82, 0.1);
}

.difficulty button.is-selected {
  color: #fff2d3;
  background: #a8473b;
  box-shadow: inset 0 0 0 1px rgba(255, 208, 139, 0.25);
}

.hud {
  display: grid;
  align-self: start;
  grid-area: hud;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--gold);
  background: rgba(5, 17, 27, 0.9);
  box-shadow: var(--shadow);
  clip-path: polygon(10px 0, calc(100% - 10px) 0, 100% 10px, 100% calc(100% - 10px), calc(100% - 10px) 100%, 10px 100%, 0 calc(100% - 10px), 0 10px);
}

.hud-stat {
  display: grid;
  min-width: 0;
  padding: 16px 14px 18px;
  grid-template-columns: 20px 1fr;
  gap: 4px 7px;
  border-right: 1px solid rgba(201, 156, 82, 0.35);
}

.hud-stat:last-child {
  border-right: 0;
}

.hud-stat svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: var(--gold);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.5;
}

.hud-label {
  color: #c5c5b8;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hud-stat strong {
  grid-column: 1 / -1;
  color: var(--parchment);
  font-family: var(--display);
  font-size: clamp(1.45rem, 2.6vw, 2rem);
  font-variant-numeric: tabular-nums;
  line-height: 1;
  text-align: center;
}

.hud-stat--combo strong {
  color: var(--coral);
}

.play-area {
  position: relative;
  display: flex;
  align-items: center;
  flex-direction: column;
  grid-area: play;
}

.board-frame {
  position: relative;
  width: min(680px, 100%);
  padding: clamp(13px, 2vw, 20px);
  border: 1px solid var(--gold);
  background: rgba(4, 14, 23, 0.84);
  box-shadow: var(--shadow), inset 0 0 50px rgba(31, 91, 103, 0.12);
  clip-path: polygon(13px 0, calc(100% - 13px) 0, 100% 13px, 100% calc(100% - 13px), calc(100% - 13px) 100%, 13px 100%, 0 calc(100% - 13px), 0 13px);
}

.board-frame::before,
.board-frame::after {
  position: absolute;
  width: 27px;
  height: 27px;
  border: solid var(--gold);
  content: "";
  pointer-events: none;
}

.board-frame::before {
  top: 7px;
  left: 7px;
  border-width: 1px 0 0 1px;
}

.board-frame::after {
  right: 7px;
  bottom: 7px;
  border-width: 0 1px 1px 0;
}

.board {
  --columns: 4;
  display: grid;
  gap: clamp(8px, 1.4vw, 14px);
  grid-template-columns: repeat(var(--columns), minmax(0, 1fr));
  perspective: 1000px;
}

.memory-card {
  position: relative;
  min-width: 0;
  cursor: pointer;
  aspect-ratio: 0.79;
  padding: 0;
  border: 0;
  border-radius: 7px;
  background: transparent;
  transform-style: preserve-3d;
  transition: transform 180ms ease;
}

.memory-card__inner {
  position: absolute;
  inset: 0;
  display: block;
  border-radius: inherit;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.28);
  transform-style: preserve-3d;
  transition: transform 520ms cubic-bezier(0.2, 0.72, 0.22, 1), box-shadow 240ms ease;
}

.memory-card:hover .memory-card__inner {
  box-shadow: 0 12px 26px rgba(0, 0, 0, 0.38), 0 0 0 1px rgba(239, 208, 140, 0.5);
}

.memory-card:not(.is-matched):hover {
  transform: translateY(-3px);
}

.memory-card.is-flipped .memory-card__inner {
  transform: rotateY(180deg);
}

.memory-card.is-matched {
  cursor: default;
}

.memory-card.is-matched .memory-card__inner {
  animation: matched-pulse 600ms ease both;
  box-shadow: 0 0 0 2px rgba(146, 218, 169, 0.7), 0 0 25px rgba(155, 219, 154, 0.38);
}

.memory-card__front,
.memory-card__back {
  position: absolute;
  inset: 0;
  display: flex;
  overflow: hidden;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--gold);
  border-radius: inherit;
  backface-visibility: hidden;
}

.memory-card__back {
  background-color: #092333;
  background-image:
    radial-gradient(circle at center, rgba(239, 208, 140, 0.08) 0 1px, transparent 2px),
    linear-gradient(135deg, transparent 48%, rgba(201, 156, 82, 0.1) 49%, rgba(201, 156, 82, 0.1) 51%, transparent 52%);
  background-size: 22px 22px, 36px 36px;
  box-shadow: inset 0 0 0 4px #071a27, inset 0 0 0 5px rgba(201, 156, 82, 0.52);
}

.card-sigil {
  position: relative;
  display: grid;
  width: 48%;
  aspect-ratio: 1;
  place-items: center;
  border: 1px solid rgba(239, 208, 140, 0.7);
  border-radius: 50%;
}

.card-sigil::before,
.card-sigil::after {
  position: absolute;
  content: "";
  background: var(--gold-bright);
  clip-path: polygon(50% 0, 59% 41%, 100% 50%, 59% 59%, 50% 100%, 41% 59%, 0 50%, 41% 41%);
}

.card-sigil::before {
  width: 58%;
  height: 58%;
  opacity: 0.9;
}

.card-sigil::after {
  width: 18%;
  height: 18%;
  background: var(--ink-900);
}

.memory-card__front {
  display: block;
  padding: 0;
  background: #efe2c5;
  color: #14232a;
  transform: rotateY(180deg);
  box-shadow: inset 0 0 0 3px #0b2534;
}

.creature-art {
  position: absolute;
  inset: 0;
  display: block;
  overflow: hidden;
  border-radius: inherit;
  background: #efe2c5;
}

.creature-image {
  position: absolute;
  top: calc(var(--sprite-row) * -100%);
  left: 50%;
  display: block;
  width: auto;
  max-width: none;
  height: 200%;
  user-select: none;
  transform: translateX(var(--sprite-x));
  pointer-events: none;
}

.creature-name {
  position: absolute;
  z-index: 2;
  right: 0;
  bottom: 0;
  left: 0;
  display: block;
  padding: 5px 2px 4px;
  overflow: hidden;
  background: #0a2432;
  color: #f3dfb4;
  font-family: var(--display);
  font-size: clamp(0.48rem, 1.1vw, 0.73rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1;
  text-align: center;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

.combo-burst {
  position: absolute;
  top: 38%;
  left: calc(50% + 380px);
  display: grid;
  min-width: 150px;
  opacity: 0;
  place-items: center;
  color: var(--gold-bright);
  pointer-events: none;
  text-align: center;
  transform: translate(-50%, 16px) scale(0.92);
}

.combo-burst.is-visible {
  animation: combo-pop 1.45s ease both;
}

.combo-burst::before {
  position: absolute;
  width: 210px;
  height: 210px;
  border: 1px solid rgba(239, 208, 140, 0.26);
  border-radius: 50%;
  content: "";
  box-shadow: 0 0 42px rgba(214, 192, 89, 0.14);
}

.combo-burst__eyebrow {
  color: var(--coral);
  font-family: var(--display);
  font-size: 1.4rem;
  font-weight: 700;
}

.combo-burst strong {
  margin-top: 2px;
  font-family: var(--display);
  font-size: 2rem;
  text-transform: uppercase;
}

.combo-burst > span:last-child {
  margin-top: 2px;
  color: var(--coral);
  font-family: var(--display);
  font-size: 1.8rem;
  font-weight: 700;
}

.restart-button {
  display: inline-flex;
  min-width: 170px;
  min-height: 45px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  margin-top: 20px;
  cursor: pointer;
  border: 1px solid var(--gold);
  border-radius: 999px;
  background: rgba(6, 24, 35, 0.86);
  color: var(--parchment);
  font-size: 0.9rem;
  font-weight: 650;
  letter-spacing: 0.03em;
  transition: background-color 180ms ease, color 180ms ease, transform 180ms ease;
}

.restart-button:hover {
  color: var(--gold-bright);
  background: rgba(15, 48, 61, 0.92);
  transform: translateY(-1px);
}

.restart-button svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.game-footer {
  display: flex;
  width: min(1180px, calc(100% - 40px));
  justify-content: space-between;
  gap: 24px;
  margin: auto auto 0;
  padding: 16px 0 22px;
  border-top: 1px solid rgba(201, 156, 82, 0.2);
  color: #9baeb1;
  font-size: 0.76rem;
  letter-spacing: 0.02em;
}

.modal-backdrop {
  position: fixed;
  z-index: 20;
  inset: 0;
  display: grid;
  padding: 24px;
  overflow-y: auto;
  place-items: center;
  background: rgba(2, 9, 15, 0.82);
  backdrop-filter: blur(12px);
}

.modal-backdrop[hidden] {
  display: none;
}

.result-card {
  position: relative;
  width: min(470px, 100%);
  padding: 40px clamp(26px, 5vw, 48px) 34px;
  border: 1px solid var(--gold);
  background: #071a27;
  box-shadow: var(--shadow), inset 0 0 70px rgba(27, 74, 82, 0.18);
  text-align: center;
  clip-path: polygon(14px 0, calc(100% - 14px) 0, 100% 14px, 100% calc(100% - 14px), calc(100% - 14px) 100%, 14px 100%, 0 calc(100% - 14px), 0 14px);
  animation: modal-in 420ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.result-card__close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 36px;
  height: 36px;
}

.result-sigil {
  width: 64px;
  height: 64px;
  margin-bottom: 14px;
  fill: none;
  stroke: var(--gold);
  stroke-linejoin: round;
  stroke-width: 1.2;
}

.result-card h2 {
  font-size: clamp(2.25rem, 6vw, 3.25rem);
  line-height: 1;
}

.result-card > p:not(.personal-best) {
  margin: 12px 0 24px;
  color: var(--parchment-muted);
}

.result-stats {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 15px 0;
  border-top: 1px solid rgba(201, 156, 82, 0.4);
  border-bottom: 1px solid rgba(201, 156, 82, 0.4);
}

.result-stats div {
  display: flex;
  min-height: 42px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.result-stats dt {
  color: #c5c5b8;
  font-size: 0.76rem;
  font-weight: 750;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.result-stats dd {
  margin: 0;
  color: var(--coral);
  font-family: var(--display);
  font-size: 1.55rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.personal-best {
  width: fit-content;
  margin: 16px auto 0;
  padding: 6px 11px;
  border: 1px solid rgba(130, 201, 194, 0.5);
  color: var(--teal);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.result-actions {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

.primary-button,
.secondary-button {
  min-height: 48px;
  cursor: pointer;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  transition: transform 180ms ease, filter 180ms ease;
}

.primary-button {
  border: 1px solid var(--gold-bright);
  background: #a8473b;
  color: #fff2d3;
  box-shadow: 0 9px 24px rgba(168, 71, 59, 0.3);
}

.secondary-button {
  border: 1px solid rgba(201, 156, 82, 0.58);
  background: transparent;
  color: var(--parchment);
}

.primary-button:hover,
.secondary-button:hover {
  filter: brightness(1.12);
  transform: translateY(-1px);
}

@keyframes matched-pulse {
  0% { transform: rotateY(180deg) translateY(-2px) scale(1); }
  45% { transform: rotateY(180deg) translateY(-2px) scale(1.05); }
  100% { transform: rotateY(180deg) translateY(-2px) scale(1); }
}

@keyframes loader-orbit {
  to { transform: rotate(360deg); }
}

@keyframes combo-pop {
  0% { opacity: 0; transform: translate(-50%, 20px) scale(0.78); }
  20%, 72% { opacity: 1; transform: translate(-50%, 0) scale(1); }
  100% { opacity: 0; transform: translate(-50%, -18px) scale(1.03); }
}

@keyframes modal-in {
  from { opacity: 0; transform: translateY(18px) scale(0.96); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

@media (max-width: 1080px) {
  .game-layout {
    grid-template-columns: 1fr;
    grid-template-areas:
      "intro"
      "hud"
      "play";
  }

  .hud {
    width: min(680px, 100%);
    justify-self: center;
  }

  .combo-burst {
    top: 44%;
    left: 50%;
    z-index: 4;
    padding: 18px 22px;
    background: rgba(5, 17, 27, 0.9);
  }
}

@media (max-width: 700px) {
  body {
    background-position: 32% center;
  }

  .topbar {
    height: 62px;
    padding: 0 18px;
  }

  .brand-mark {
    width: 25px;
    height: 25px;
  }

  .icon-button {
    width: 38px;
    height: 38px;
  }

  .game-layout {
    width: min(100% - 24px, 620px);
    padding-top: 30px;
    row-gap: 22px;
  }

  .title-lockup {
    justify-content: center;
    gap: 10px;
    text-align: center;
  }

  h1 {
    font-size: clamp(2.2rem, 11vw, 3.5rem);
  }

  .title-flourish {
    width: 24px;
    flex-basis: 24px;
  }

  .intro > p {
    margin: 12px auto 18px;
    text-align: center;
  }

  .difficulty {
    width: 100%;
    margin-left: 0;
  }

  .difficulty button {
    min-height: 43px;
    font-size: 0.82rem;
  }

  .hud-stat {
    padding: 12px 8px 13px;
    grid-template-columns: 15px 1fr;
    gap: 3px 4px;
  }

  .hud-stat svg {
    width: 15px;
    height: 15px;
  }

  .hud-label {
    font-size: 0.56rem;
    letter-spacing: 0.08em;
  }

  .hud-stat strong {
    font-size: clamp(1.2rem, 6vw, 1.6rem);
  }

  .board-frame {
    padding: 10px;
  }

  .board {
    gap: 7px;
  }

  .creature-name {
    padding: 4px 1px 3px;
    font-size: clamp(0.36rem, 2.1vw, 0.58rem);
  }

  .restart-button {
    min-width: 150px;
    min-height: 42px;
    margin-top: 16px;
  }

  .game-footer {
    width: calc(100% - 24px);
    align-items: center;
    flex-direction: column;
    gap: 6px;
    text-align: center;
  }
}

@media (max-width: 440px) {
  .board[data-columns="4"] {
    gap: 5px;
  }

  .creature-name {
    display: none;
  }

  .combo-burst::before {
    width: 170px;
    height: 170px;
  }
}

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