:root {
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: #edf2f7;
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
}

#board {
  position: fixed;
  inset: 0;
  display: block;
  cursor: crosshair;
  touch-action: none;
}

.hud {
  position: fixed;
  top: 14px;
  left: 16px;
  display: flex;
  gap: 18px;
  padding: 10px 16px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(113, 138, 156, 0.25);
  border-radius: 12px;
  font-size: 14px;
  color: #35495a;
  backdrop-filter: blur(6px);
  user-select: none;
}

.hud strong {
  margin-left: 4px;
  font-size: 18px;
  color: #1d2d3a;
}

.hint {
  position: fixed;
  right: 0;
  bottom: 12px;
  left: 0;
  margin: 0;
  text-align: center;
  font-size: 12.5px;
  color: rgba(53, 73, 90, 0.62);
  user-select: none;
  pointer-events: none;
}

.pause-overlay,
.end-overlay {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(23, 35, 45, 0.42);
  backdrop-filter: blur(4px);
}

.start-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #edf2f7;
}

.settings-overlay,
.help-overlay {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: #edf2f7;
}

.pause-card,
.end-card,
.settings-card,
.help-card {
  min-width: 280px;
  max-width: 460px;
  padding: 32px 40px;
  background: #ffffff;
  border-radius: 18px;
  box-shadow: 0 22px 60px rgba(20, 32, 44, 0.28);
  text-align: center;
}

.pause-card h1,
.end-card h1,
.settings-card h1,
.help-card h1 {
  margin: 0 0 8px;
  font-size: 24px;
  color: #1d2d3a;
}

.help-card {
  width: min(740px, calc(100vw - 48px));
  max-width: none;
  max-height: calc(100vh - 48px);
  display: flex;
  flex-direction: column;
}

.help-card .help-content {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  padding-right: 6px;
}

.about-card {
  max-width: 460px;
}

.mode-card {
  max-width: 460px;
}

.mode-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 18px 0 6px;
}

.mode-list .mode-option {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 5px;
  width: 100%;
  margin: 0;
  padding: 14px 18px;
  border: 2px solid rgba(120, 136, 154, 0.4);
  border-radius: 12px;
  background: #ffffff;
  color: #1d2d3a;
  text-align: left;
}

.mode-list .mode-option:hover {
  background: #f2f7fa;
  border-color: rgba(90, 110, 130, 0.75);
  filter: none;
}

.mode-option strong {
  font-size: 16px;
}

.mode-option small {
  font-size: 12.5px;
  line-height: 1.5;
  color: #5a6d7c;
}

.mode-hud {
  top: 62px;
}

.game-logo {
  display: block;
  width: 136px;
  height: 136px;
  margin: 0 auto;
  cursor: pointer;
}

.game-logo.is-bouncing {
  animation: logo-bounce 0.72s cubic-bezier(0.28, 0.84, 0.42, 1);
}

@keyframes logo-bounce {
  0% { transform: translateY(0) scale(1, 1); }
  16% { transform: translateY(-26px) scale(0.96, 1.06); }
  34% { transform: translateY(0) scale(1.07, 0.93); }
  50% { transform: translateY(-14px) scale(0.98, 1.02); }
  64% { transform: translateY(0) scale(1.04, 0.96); }
  76% { transform: translateY(-6px) scale(1, 1); }
  88% { transform: translateY(0) scale(1.02, 0.98); }
  100% { transform: translateY(0) scale(1, 1); }
}

.home-title {
  margin: 22px 0 10px;
}

.home-title-logo {
  display: block;
  height: 48px;
  width: auto;
  margin: 0 auto;
}

.home-tagline {
  margin: 0;
  font-size: 15px;
  color: #67788a;
}

.home-actions {
  width: 300px;
  margin-top: 38px;
}

.home-actions button {
  display: block;
  width: 100%;
  margin-top: 12px;
  padding: 13px 18px;
  border: none;
  border-radius: 10px;
  background: #2d5f80;
  color: #ffffff;
  font-family: inherit;
  font-size: 16px;
  cursor: pointer;
}

.home-actions button.secondary {
  background: #e8eef3;
  color: #35506b;
}

.home-actions button:hover {
  filter: brightness(1.06);
}

.pause-card p,
.end-card p {
  margin: 0 0 20px;
  font-size: 13px;
  color: #67788a;
}

.pause-card button,
.end-card button,
.settings-card button,
.help-card button {
  display: block;
  width: 100%;
  margin-top: 10px;
  padding: 11px 18px;
  border: none;
  border-radius: 10px;
  background: #2d5f80;
  color: #ffffff;
  font-family: inherit;
  font-size: 15px;
  cursor: pointer;
}

.pause-card button.secondary,
.end-card button.secondary,
.settings-card button.secondary,
.help-card button.secondary {
  background: #e8eef3;
  color: #35506b;
}

.pause-card button:hover,
.end-card button:hover,
.settings-card button:hover,
.help-card button:hover {
  filter: brightness(1.06);
}

.repo-button {
  position: absolute;
  top: 22px;
  right: 26px;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  padding: 0;
  border: 2px solid rgba(120, 136, 154, 0.5);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.85);
  color: #35506b;
  font-family: inherit;
  font-size: 21px;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
}

.repo-button:hover {
  background: #ffffff;
  border-color: rgba(90, 110, 130, 0.7);
}

.repo-button::after {
  content: "仓库页面";
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 12px;
  border-radius: 8px;
  background: rgba(29, 45, 58, 0.92);
  color: #ffffff;
  font-size: 12.5px;
  font-weight: 400;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease;
}

.repo-button:hover::after {
  opacity: 1;
}

.about-button {
  right: auto;
  left: 26px;
}

.about-button::after {
  content: "关于𣿅";
}

.news-button {
  right: 82px;
}

.news-button::after {
  content: "更新公告";
}

.news-card {
  max-width: 460px;
}

.news-date {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: #93a3b0;
}

.tool-dock {
  position: fixed;
  top: 84px;
  right: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 10px 8px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(113, 138, 156, 0.25);
  border-radius: 14px;
  backdrop-filter: blur(6px);
  user-select: none;
}

.tool-slot {
  position: relative;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 2px solid transparent;
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
}

.tool-slot.is-selected {
  border-color: #2d5f80;
  background: rgba(45, 95, 128, 0.1);
}

.tool-slot:hover {
  background: rgba(45, 95, 128, 0.06);
}

.tool-icon {
  display: block;
}

.tool-icon-ball {
  width: 20px;
  height: 20px;
  border: 2px solid #2b3a46;
  border-radius: 50%;
  background: #ffffff;
}

.tool-icon-balloon {
  width: 16px;
  height: 17px;
  border: 2px solid #d8839b;
  border-radius: 50% 50% 46% 46%;
  background: #f2a8bb;
}

.tool-icon-bomb {
  width: 18px;
  height: 18px;
  border: 2px solid #c47a34;
  border-radius: 50%;
  background: #e59a4e;
}

.tool-icon-blackhole {
  width: 16px;
  height: 16px;
  border: 2px solid #2a2438;
  border-radius: 50%;
  background: #0b0d10;
  box-shadow: 0 0 6px rgba(180, 100, 200, 0.55);
}

.tool-cd {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  pointer-events: none;
}

.tool-divider {
  width: 22px;
  height: 2px;
  border-radius: 1px;
  background: rgba(113, 138, 156, 0.4);
}

.tool-name {
  position: fixed;
  right: 80px;
  transform: translateY(-50%);
  padding: 4px 10px;
  border-radius: 8px;
  background: rgba(29, 45, 58, 0.85);
  color: #ffffff;
  font-size: 12px;
  white-space: nowrap;
  pointer-events: none;
  user-select: none;
  transition: top 0.15s ease;
}

.help-content {
  margin: 4px 0 18px;
  text-align: left;
}

.help-content p {
  margin: 10px 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: #5a6d7c;
}

.help-content .help-intro {
  margin-bottom: 14px;
  font-size: 14px;
  color: #35506b;
}

.home-bubbles {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.home-bubbles span {
  position: absolute;
  border-radius: 50%;
  animation: bubble-drift-a 20s ease-in-out infinite alternate;
}

.home-bubbles span:nth-child(odd) {
  background: rgba(255, 255, 255, 0.62);
}

.home-bubbles span:nth-child(even) {
  background: rgba(214, 226, 234, 0.6);
}

.home-bubbles span:nth-child(1) {
  width: 260px;
  height: 260px;
  left: -70px;
  top: 6%;
  animation-duration: 23s;
}

.home-bubbles span:nth-child(2) {
  width: 130px;
  height: 130px;
  right: 9%;
  top: 12%;
  animation-duration: 19s;
  animation-delay: -4s;
  animation-name: bubble-drift-b;
}

.home-bubbles span:nth-child(3) {
  width: 84px;
  height: 84px;
  left: 30%;
  top: 58%;
  animation-duration: 16s;
  animation-delay: -8s;
}

.home-bubbles span:nth-child(4) {
  width: 190px;
  height: 190px;
  right: 5%;
  bottom: 14%;
  animation-duration: 25s;
  animation-delay: -6s;
  animation-name: bubble-drift-b;
}

.home-bubbles span:nth-child(5) {
  width: 110px;
  height: 110px;
  left: 7%;
  bottom: 26%;
  animation-duration: 18s;
  animation-delay: -11s;
}

.home-bubbles span:nth-child(6) {
  width: 64px;
  height: 64px;
  right: 24%;
  top: 44%;
  animation-duration: 14s;
  animation-delay: -3s;
  animation-name: bubble-drift-b;
}

@keyframes bubble-drift-a {
  from { transform: translate(0, 0); }
  to { transform: translate(44px, -30px); }
}

@keyframes bubble-drift-b {
  from { transform: translate(0, 0); }
  to { transform: translate(-36px, 26px); }
}

.home-stage {
  position: absolute;
  right: 0;
  bottom: 52px;
  left: 0;
  height: 172px;
  pointer-events: none;
}

.stage-belt {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 24px;
  border-top: 2px solid rgba(137, 155, 169, 0.4);
  border-bottom: 2px solid rgba(137, 155, 169, 0.3);
  border-radius: 4px;
  background-color: #c6d3dc;
  background-image: repeating-linear-gradient(90deg, rgba(255, 255, 255, 0) 0 12px, rgba(255, 255, 255, 0.45) 12px 20px);
  animation: belt-move 1.4s linear infinite;
}

@keyframes belt-move {
  from { background-position-x: 0; }
  to { background-position-x: 20px; }
}

.stage-body {
  position: absolute;
  bottom: 14px;
  left: 17%;
  height: 132px;
  animation: body-sway 3.6s ease-in-out infinite alternate;
}

.stage-head {
  position: absolute;
  bottom: 112px;
  left: calc(17% + 62px);
  height: 64px;
  will-change: transform;
}

@keyframes body-sway {
  from { transform: translateY(0); }
  to { transform: translateY(-3px); }
}

@media (max-width: 880px) {
  .home-stage {
    display: none;
  }
}

@media (max-height: 640px) {
  .home-stage {
    display: none;
  }
}

.home-footer {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  padding: 16px 0 20px;
  font-size: 12.5px;
  color: rgba(53, 73, 90, 0.55);
  user-select: none;
}

.home-footer .footer-link {
  color: rgba(45, 95, 128, 0.85);
  text-decoration: none;
}

.home-footer .footer-link:hover {
  text-decoration: underline;
}

.settings-card {
  width: min(560px, calc(100vw - 48px));
  max-width: none;
}

.settings-group {
  text-align: left;
}

.settings-group h2 {
  margin: 20px 0 0;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: #93a3b0;
}

.settings-group:first-of-type h2 {
  margin-top: 14px;
}

.settings-list {
  margin: 4px 0 18px;
  text-align: left;
}

.toggle-row {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  margin: 14px 0;
  font-size: 14px;
  color: #35506b;
  cursor: pointer;
  user-select: none;
}

.toggle-row input {
  width: 16px;
  height: 16px;
  margin-top: 2px;
  flex: none;
  accent-color: #2d5f80;
  cursor: pointer;
}

.toggle-row small {
  display: block;
  margin-top: 3px;
  font-size: 11.5px;
  line-height: 1.5;
  color: #93a3b0;
}

.end-card .end-stats {
  margin: 0 0 20px;
  font-size: 14px;
  font-weight: 600;
  color: #35506b;
}

[hidden] {
  display: none !important;
}