:root {
  --font-main: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro", -system,
    sans-serif;
  --ui-bg: rgba(6, 10, 24, 0.9);
  --ui-border: rgba(121, 166, 255, 0.38);
  --accent: #ff8ad4;
  --accent-soft: rgba(255, 138, 212, 0.16);
  --danger: #ff4d6a;
  --shadow-soft: 0 14px 40px rgba(0, 0, 0, 0.55);
  --radius-pill: 999px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --transition-fast: 0.16s ease-out;

  --hud-font-size: 12px;
  --hud-font-size-sm: 10px;
  --tower-panel-width: 210px;
}

/* RESET */

*,
*::before,
*::after {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  overflow: hidden;
  background: radial-gradient(
    circle at top,
    #162447 0,
    #0b0d16 55%,
    #000 100%
  );
  font-family: var(--font-main);
  color: #eef3ff;
}

/* ROOT */

#ui-root {
  position: fixed;
  inset: 0;
  pointer-events: none;
  font-family: var(--font-main);
  color: #eef3ff;
  z-index: 10;
}

/* HUD TOP BAR */

.hud-bar {
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  padding: 8px 16px;
  background: linear-gradient(
    to bottom,
    rgba(6, 10, 24, 0.98),
    rgba(6, 10, 24, 0.92)
  );
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(117, 160, 255, 0.25);
  backdrop-filter: blur(12px);
  pointer-events: auto;
  min-width: 320px;
}

.hud-pill {
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  background: radial-gradient(
    circle at top,
    rgba(123, 169, 255, 0.18),
    transparent
  );
  border: 1px solid rgba(111, 155, 255, 0.24);
  font-size: var(--hud-font-size);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

/* CONTROL BAR: Start / Pause 单独一行 */

.control-bar {
  position: absolute;
  top: 50px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-wrap: nowrap;
  gap: 10px;
  padding: 6px 12px;
  background: rgba(5, 8, 20, 0.98);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(117, 160, 255, 0.22);
  backdrop-filter: blur(10px);
  pointer-events: auto;
  align-items: center;
}

.hud-button {
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(165, 196, 255, 0.5);
  background: radial-gradient(
    circle at top,
    rgba(120, 162, 255, 0.18),
    rgba(8, 14, 30, 0.98)
  );
  color: #f4f7ff;
  font-size: var(--hud-font-size);
  cursor: pointer;
  pointer-events: auto;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.4);
  transition: all var(--transition-fast);
}

.hud-button.accent {
  border-color: var(--accent);
  background: radial-gradient(
    circle at top,
    var(--accent-soft),
    rgba(8, 14, 30, 0.98)
  );
  color: #ffeefe;
}

.hud-button.small {
  padding: 5px 10px;
  font-size: var(--hud-font-size-sm);
}

.hud-button.danger {
  border-color: var(--danger);
  color: #ffeef2;
}

.hud-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.6);
  background-position-y: -4px;
}

.hud-button:active {
  transform: translateY(1px) scale(0.97);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.7);
}

.hud-button.disabled {
  opacity: 0.4;
  cursor: default;
  box-shadow: none;
}

/* TOWER PANEL */

.tower-panel {
  position: absolute;
  left: 12px;
  top: 100px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px;
  width: var(--tower-panel-width);
  background: var(--ui-bg);
  border-radius: 20px;
  border: 1px solid var(--ui-border);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(16px);
  pointer-events: auto;
}

.tower-btn {
  width: 100%;
  padding: 8px 9px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(126, 192, 255, 0.26);
  background: radial-gradient(
    circle at top left,
    rgba(126, 192, 255, 0.12),
    transparent
  );
  color: #edf3ff;
  text-align: left;
  font-size: 11px;
  cursor: pointer;
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  column-gap: 4px;
  row-gap: 2px;
  transition: all var(--transition-fast);
}

.tower-btn .tower-name {
  grid-column: 1 / 2;
  font-weight: 600;
}

.tower-btn .tower-cost {
  grid-column: 2 / 3;
  justify-self: flex-end;
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 999px;
  background: rgba(10, 16, 32, 0.92);
  border: 1px solid rgba(255, 186, 255, 0.6);
  color: var(--accent);
}

.tower-btn .tower-desc {
  grid-column: 1 / 3;
  font-size: 10px;
  color: rgba(208, 220, 255, 0.82);
}

.tower-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.6);
  background-color: rgba(60, 80, 130, 0.4);
}

.tower-btn.selected {
  border-color: var(--accent);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.7);
  background: radial-gradient(
    circle at top,
    var(--accent-soft),
    rgba(9, 16, 33, 0.98)
  );
}

.tower-btn.disabled {
  opacity: 0.42;
  cursor: default;
  box-shadow: none;
  filter: grayscale(0.3);
}

/* SELECTION PANEL */

.selection-panel {
  position: absolute;
  left: 12px;
  bottom: 18px;
  padding: 10px 12px;
  width: var(--tower-panel-width);
  background: var(--ui-bg);
  border-radius: 18px;
  border: 1px solid rgba(129, 177, 255, 0.3);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(16px);
  pointer-events: auto;
}

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

.selection-title {
  font-size: 12px;
  margin-bottom: 6px;
  font-weight: 600;
  color: #ffefff;
}

.selection-btn-area {
  display: flex;
  gap: 6px;
}

/* CENTER MESSAGE */

.center-message {
  position: absolute;
  left: 50%;
  top: 38%;
  transform: translate(-50%, -50%);
  padding: 14px 26px;
  background: radial-gradient(
    circle at top,
    rgba(255, 170, 238, 0.18),
    rgba(5, 6, 18, 0.96)
  );
  border-radius: 24px;
  border: 1px solid rgba(255, 193, 255, 0.7);
  color: #ffeefe;
  white-space: pre-line;
  text-align: center;
  pointer-events: none;
  box-shadow: 0 18px 42px rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(18px);
  font-size: 15px;
}

.center-message.hidden {
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.95);
  pointer-events: none;
  transition: all 0.2s ease-out;
}

/* BOTTOM HINT */

.bottom-hint {
  position: absolute;
  left: 50%;
  bottom: 16px;
  transform: translateX(-50%);
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  background: rgba(3, 6, 16, 0.92);
  border: 1px solid rgba(127, 177, 255, 0.28);
  color: rgba(212, 224, 255, 0.9);
  font-size: 10px;
  letter-spacing: 0.03em;
  pointer-events: none;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(14px);
}

/* TOOLTIP */

.tooltip {
  position: absolute;
  padding: 4px 8px;
  border-radius: 8px;
  background: rgba(9, 12, 25, 0.96);
  border: 1px solid rgba(164, 198, 255, 0.7);
  font-size: 10px;
  color: #f2f5ff;
  pointer-events: none;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(12px);
  max-width: 180px;
}

.tooltip.hidden {
  opacity: 0;
  transform: translateY(4px);
  transition: all 0.16s ease-out;
}

/* RESULT OVERLAY */

.result-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(
    circle at top,
    rgba(8, 12, 28, 0.82),
    rgba(0, 0, 0, 0.92)
  );
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: auto;
}

.result-overlay.hidden {
  display: none;
}

.result-card {
  padding: 22px 26px 18px;
  border-radius: 22px;
  background: radial-gradient(
    circle at top,
    rgba(255, 183, 243, 0.14),
    rgba(7, 9, 20, 0.98)
  );
  border: 1px solid rgba(173, 205, 255, 0.46);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.85);
  text-align: center;
  min-width: 260px;
  max-width: 320px;
  color: #fdf5ff;
}

.result-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.result-stars {
  font-size: 22px;
  letter-spacing: 4px;
  color: #ffd27f;
  text-shadow: 0 0 12px rgba(255, 210, 127, 0.9);
  margin-bottom: 8px;
}

.result-detail {
  font-size: 12px;
  color: rgba(223, 233, 255, 0.9);
  margin-bottom: 14px;
  white-space: pre-line;
}

.result-actions {
  display: flex;
  justify-content: center;
  gap: 10px;
}

/* MOBILE ADAPTATION */

@media (max-width: 768px) {
  :root {
    --hud-font-size: 10px;
    --hud-font-size-sm: 9px;
    --tower-panel-width: min(50vw, 192px);
  }

  .hud-bar {
    top: 6px;
    padding: 6px 10px;
    gap: 8px;
    min-width: auto;
  }

  .control-bar {
    top: 42px;
    padding: 4px 8px;
    gap: 6px;
  }

  .hud-pill {
    padding: 4px 8px;
    font-size: var(--hud-font-size);
  }

  .hud-button {
    padding: 4px 8px;
    font-size: var(--hud-font-size);
  }

  .tower-panel {
    top: auto;
    bottom: 78px;
    left: 6px;
    right: 6px;
    width: auto;
    flex-direction: row;
    overflow-x: auto;
    padding: 6px;
    gap: 6px;
    scrollbar-width: none;
  }

  .tower-panel::-webkit-scrollbar {
    display: none;
  }

  .tower-btn {
    min-width: 150px;
    padding: 6px 8px;
    font-size: 9px;
  }

  .tower-btn .tower-desc {
    font-size: 9px;
  }

  .selection-panel {
    left: 6px;
    right: 6px;
    bottom: 10px;
    width: auto;
    display: flex;
    flex-direction: column;
    gap: 6px;
  }

  .center-message {
    top: 42%;
    padding: 10px 16px;
    font-size: 12px;
    max-width: 80vw;
  }

  .bottom-hint {
    bottom: 6px;
    padding: 4px 10px;
    font-size: 8px;
  }

  .result-card {
    width: 86vw;
    max-width: none;
  }
}

/* VERY SMALL DEVICES */

@media (max-width: 480px) {
  :root {
    --hud-font-size: 9px;
    --hud-font-size-sm: 8px;
  }

  .hud-bar {
    max-width: 98vw;
  }

  .tower-btn {
    min-width: 130px;
  }

  .center-message {
    font-size: 11px;
  }
}