:root {
  --bg-0: #f6fdff;
  --bg-1: #e3f6ff;
  --bg-2: #fff6e2;
  --ink-strong: #0f2f55;
  --ink-main: #21466f;
  --ink-soft: #4c6e90;
  --accent-cyan: #38c8ff;
  --accent-aqua: #53f0e5;
  --accent-amber: #ffba64;
  --accent-rose: #ff6e96;
  --accent-violet: #6b87ff;
  --panel-bg: rgba(246, 254, 255, 0.78);
  --panel-edge: rgba(89, 176, 215, 0.58);
  --canvas-radius: 30px;
  --ui-font: "Avenir Next", "Trebuchet MS", "Segoe UI", sans-serif;
  --display-font: "Avenir Next Condensed", "Avenir Next", "Trebuchet MS", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  min-height: 100vh;
  font-family: var(--ui-font);
  color: var(--ink-main);
  background:
    radial-gradient(circle at 10% 12%, rgba(255, 198, 115, 0.26), transparent 33%),
    radial-gradient(circle at 85% 88%, rgba(82, 214, 255, 0.24), transparent 38%),
    linear-gradient(160deg, var(--bg-0), var(--bg-1) 52%, var(--bg-2));
  overflow: hidden;
}

body::before,
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
}

body::before {
  z-index: 0;
  opacity: 0.36;
  background-image:
    linear-gradient(120deg, rgba(79, 169, 208, 0.08) 0, rgba(79, 169, 208, 0) 55%),
    repeating-linear-gradient(
      90deg,
      rgba(93, 158, 196, 0.08) 0,
      rgba(93, 158, 196, 0.08) 1px,
      rgba(0, 0, 0, 0) 1px,
      rgba(0, 0, 0, 0) 56px
    );
}

body::after {
  z-index: 1;
  background: radial-gradient(circle at 50% 100%, rgba(72, 214, 255, 0.15), transparent 40%);
}

.page {
  position: relative;
  z-index: 2;
  min-height: 100vh;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 22px;
}

.game-shell {
  position: relative;
  width: fit-content;
  max-width: 100%;
  margin-inline: auto;
  isolation: isolate;
  filter: drop-shadow(0 26px 56px rgba(28, 56, 90, 0.26));
}

.game-shell::before {
  content: "";
  position: absolute;
  inset: -9px;
  border-radius: 38px;
  z-index: -1;
  background: linear-gradient(140deg, rgba(100, 188, 226, 0.35), rgba(255, 198, 112, 0.16) 58%, rgba(102, 116, 248, 0.2));
}

.frame-accent {
  position: absolute;
  left: 22px;
  right: 22px;
  height: 3px;
  border-radius: 999px;
  pointer-events: none;
  z-index: 3;
}

.frame-accent--top {
  top: 14px;
  background: linear-gradient(90deg, rgba(53, 197, 255, 0), rgba(53, 197, 255, 0.66), rgba(98, 245, 226, 0.72), rgba(53, 197, 255, 0));
}

.frame-accent--bottom {
  bottom: 14px;
  background: linear-gradient(90deg, rgba(255, 170, 91, 0), rgba(255, 170, 91, 0.62), rgba(104, 124, 255, 0.66), rgba(255, 170, 91, 0));
}

#game-canvas {
  display: block;
  width: min(100vw - 44px, 960px);
  height: auto;
  max-height: calc(100vh - 44px);
  border-radius: var(--canvas-radius);
  border: 1px solid rgba(143, 220, 247, 0.68);
  background: linear-gradient(180deg, #e9f8ff, #dff5ff 56%, #f8efd9);
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.62),
    inset 0 18px 42px rgba(255, 255, 255, 0.3);
}

.menu-panel {
  --state-a: var(--accent-cyan);
  --state-b: var(--accent-aqua);
  position: absolute;
  top: 24px;
  left: 24px;
  width: min(420px, 46%);
  padding: 20px 22px;
  border-radius: 24px;
  border: 1px solid var(--panel-edge);
  background:
    linear-gradient(150deg, rgba(255, 255, 255, 0.7), var(--panel-bg) 52%, rgba(239, 252, 255, 0.74)),
    radial-gradient(circle at 15% 12%, rgba(255, 255, 255, 0.82), transparent 44%);
  backdrop-filter: blur(6px) saturate(126%);
  box-shadow:
    0 16px 36px rgba(21, 54, 84, 0.24),
    inset 0 1px 0 rgba(255, 255, 255, 0.84);
  display: flex;
  flex-direction: column;
  gap: 11px;
}

.menu-panel::before {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  top: 10px;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0), var(--state-a), var(--state-b), rgba(255, 255, 255, 0));
}

.menu-panel[data-state="win"] {
  --state-a: #65df87;
  --state-b: #ffd06d;
}

.menu-panel[data-state="lose"] {
  --state-a: #ff8f7d;
  --state-b: #ff70a9;
}

.menu-panel[data-state="upgrade"] {
  --state-a: #6cf0d3;
  --state-b: #7fafff;
}

.menu-kicker {
  margin: 0;
  font: 700 0.72rem/1 var(--ui-font);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #2f5f85;
}

.menu-title {
  margin: 0;
  font-family: var(--display-font);
  font-size: clamp(2.1rem, 4.7vw, 3.3rem);
  line-height: 0.95;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-strong);
  text-shadow: 0 3px 14px rgba(103, 198, 231, 0.22);
}

.menu-subtitle {
  margin: 0;
  color: var(--ink-main);
  line-height: 1.45;
  max-width: 32ch;
  font-size: 0.95rem;
  white-space: pre-line;
}

.menu-panel[data-state="lose"] .menu-subtitle {
  font-size: 0.88rem;
  line-height: 1.38;
}

.brief-grid {
  margin: 2px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.brief-item {
  margin: 0;
  border: 1px solid rgba(124, 188, 219, 0.48);
  border-radius: 12px;
  padding: 7px 9px 8px;
  background: linear-gradient(170deg, rgba(255, 255, 255, 0.78), rgba(230, 246, 255, 0.58));
}

.brief-label {
  margin: 0 0 3px;
  font-size: 0.64rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.brief-value {
  margin: 0;
  font: 700 0.98rem/1.2 var(--display-font);
  letter-spacing: 0.03em;
  color: var(--ink-strong);
}

.controls-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 7px;
  margin-top: 2px;
}

.control-chip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  border-radius: 10px;
  padding: 6px 8px;
  background: linear-gradient(145deg, rgba(248, 254, 255, 0.84), rgba(226, 245, 255, 0.62));
  border: 1px solid rgba(126, 194, 225, 0.4);
  min-height: 34px;
}

.control-chip span {
  font-size: 0.72rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-weight: 700;
}

kbd {
  display: inline-block;
  border: 1px solid rgba(69, 152, 196, 0.42);
  border-radius: 7px;
  padding: 3px 7px;
  font: 700 0.72rem/1 var(--ui-font);
  color: var(--ink-strong);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(226, 246, 255, 0.74));
  box-shadow: inset 0 -1px 0 rgba(98, 174, 213, 0.34);
}

#start-btn {
  margin-top: 3px;
  width: 100%;
  border: none;
  border-radius: 14px;
  padding: 13px 16px;
  font: 800 0.93rem/1 var(--display-font);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #f7fdff;
  cursor: pointer;
  background: linear-gradient(125deg, var(--state-a), var(--state-b), var(--accent-violet));
  box-shadow:
    0 9px 18px rgba(45, 103, 149, 0.32),
    inset 0 1px 0 rgba(255, 255, 255, 0.28);
  transition: transform 140ms ease, filter 140ms ease;
}

#start-btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.06);
}

#start-btn:focus-visible {
  outline: 3px solid rgba(20, 82, 119, 0.84);
  outline-offset: 2px;
}

#start-btn.hidden-control {
  display: none;
}

.upgrade-options {
  display: grid;
  gap: 8px;
  margin-top: 2px;
}

.upgrade-option {
  border: 1px solid rgba(119, 199, 232, 0.56);
  border-radius: 12px;
  background: linear-gradient(160deg, rgba(247, 255, 255, 0.92), rgba(226, 245, 255, 0.76));
  padding: 10px 11px;
  text-align: left;
  color: var(--ink-strong);
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8);
  transition: transform 120ms ease, filter 120ms ease, border-color 120ms ease;
}

.upgrade-option:hover {
  transform: translateY(-1px);
  filter: brightness(1.02);
}

.upgrade-option.is-selected {
  border-color: rgba(79, 194, 255, 0.92);
  box-shadow: 0 0 0 2px rgba(112, 220, 255, 0.28);
}

.upgrade-option.is-locked {
  cursor: not-allowed;
  opacity: 0.56;
  filter: saturate(0.65);
}

.upgrade-option__title {
  margin: 0;
  font: 800 0.85rem/1.15 var(--display-font);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.upgrade-option__meta {
  margin: 3px 0 0;
  font-size: 0.67rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.upgrade-option__desc {
  margin: 6px 0 0;
  font-size: 0.79rem;
  line-height: 1.32;
  color: #274f77;
}

.menu-upgrade-hint {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: #2b628c;
}

.menu-panel.hidden {
  display: none;
}

.hidden {
  display: none !important;
}

.touch-controls {
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 12px;
  display: none;
  justify-content: space-between;
  align-items: flex-end;
  gap: 12px;
  pointer-events: none;
  z-index: 4;
}

.touch-controls.visible {
  display: flex;
}

.touch-dpad {
  position: relative;
  width: 152px;
  height: 152px;
}

.touch-actions {
  display: grid;
  gap: 8px;
}

.touch-btn {
  pointer-events: auto;
  user-select: none;
  touch-action: none;
  border: 1px solid rgba(143, 221, 255, 0.6);
  border-radius: 14px;
  background: linear-gradient(160deg, rgba(21, 52, 82, 0.72), rgba(28, 66, 104, 0.6));
  color: #e8faff;
  font: 700 0.95rem/1 var(--display-font);
  box-shadow: 0 10px 18px rgba(8, 23, 44, 0.24), inset 0 1px 0 rgba(224, 247, 255, 0.2);
}

.touch-btn:active,
.touch-btn.active {
  transform: translateY(1px);
  filter: brightness(1.18);
}

.touch-btn--up,
.touch-btn--left,
.touch-btn--right,
.touch-btn--down {
  position: absolute;
  width: 50px;
  height: 50px;
  border-radius: 12px;
  font-size: 1rem;
}

.touch-btn--up {
  left: 51px;
  top: 0;
}

.touch-btn--left {
  left: 0;
  top: 51px;
}

.touch-btn--right {
  right: 0;
  top: 51px;
}

.touch-btn--down {
  left: 51px;
  bottom: 0;
}

.touch-btn--action {
  min-width: 104px;
  height: 44px;
  font-size: 0.76rem;
  letter-spacing: 0.08em;
}

@media (max-width: 980px) {
  .page {
    padding: 14px;
  }

  #game-canvas {
    width: min(100vw - 28px, 960px);
    max-height: calc(100vh - 28px);
  }

  .menu-panel {
    width: min(420px, 54%);
  }

  .menu-subtitle {
    max-width: none;
  }

  .menu-panel[data-state="lose"] .menu-subtitle {
    font-size: 0.84rem;
    line-height: 1.34;
  }
}

@media (max-width: 820px) {
  body {
    overflow: auto;
  }

  .page {
    align-items: flex-start;
    padding: 10px;
  }

  .game-shell {
    width: 100%;
    max-width: 960px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
  }

  .game-shell::before {
    inset: -6px;
    border-radius: 26px;
  }

  #game-canvas {
    width: min(100vw - 12px, 960px);
    max-height: none;
  }

  .frame-accent {
    left: 14px;
    right: 14px;
  }

  .menu-panel {
    position: relative;
    top: auto;
    left: auto;
    right: auto;
    bottom: auto;
    width: min(100%, 960px);
    margin: 2px 0 0;
    padding: 16px;
    border-radius: 18px;
    gap: 9px;
    background:
      linear-gradient(158deg, rgba(252, 255, 255, 0.82), rgba(239, 251, 255, 0.78) 56%, rgba(248, 242, 220, 0.72)),
      radial-gradient(circle at 14% 12%, rgba(255, 255, 255, 0.88), transparent 40%);
  }

  .menu-title {
    font-size: clamp(1.8rem, 10vw, 2.7rem);
    letter-spacing: 0.08em;
  }

  .brief-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
  }

  .controls-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
  }

  .control-chip span {
    font-size: 0.69rem;
    letter-spacing: 0.05em;
  }

  .touch-controls {
    position: relative;
    left: auto;
    right: auto;
    bottom: auto;
    width: min(100%, 960px);
    margin-top: 6px;
    padding: 0 4px 4px;
    justify-content: space-between;
    align-items: flex-end;
    gap: 14px;
  }

  .touch-dpad {
    width: 152px;
    height: 152px;
  }

  .touch-btn--up,
  .touch-btn--left,
  .touch-btn--right,
  .touch-btn--down {
    width: 50px;
    height: 50px;
    border-radius: 12px;
  }

  .touch-btn--up {
    left: 51px;
  }

  .touch-btn--left {
    top: 51px;
  }

  .touch-btn--right {
    top: 51px;
  }

  .touch-btn--down {
    left: 51px;
  }

  .touch-btn--action {
    min-width: 108px;
    height: 44px;
    font-size: 0.74rem;
  }
}