* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
  background: #0a0a12;
  color: #e8e8f0;
  overflow: hidden;
  height: 100vh;
  height: 100dvh;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
}

#app {
  width: 100%;
  height: 100vh;
  position: relative;
}

.screen {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.screen.hidden {
  display: none !important;
  pointer-events: none !important;
  visibility: hidden !important;
}

.hidden {
  display: none !important;
  pointer-events: none !important;
}

#menu {
  z-index: 200;
  pointer-events: auto;
}

#menu .menu-card,
#menu .diff-btn {
  pointer-events: auto;
  position: relative;
  z-index: 1;
}

#victory {
  z-index: 200;
}

#game-screen {
  z-index: 100;
}

#game-screen.hidden {
  display: none !important;
  pointer-events: none !important;
  visibility: hidden !important;
  z-index: -1 !important;
}

.init-error {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: #cc3333;
  color: #fff;
  padding: 12px 24px;
  border-radius: 8px;
  z-index: 9999;
  font-size: 0.9rem;
}

/* ===== 菜单 ===== */
.menu-card {
  background: linear-gradient(145deg, #1a1a2e 0%, #16213e 100%);
  border: 1px solid rgba(100, 150, 255, 0.2);
  border-radius: 20px;
  padding: 48px 56px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5),
              0 0 80px rgba(80, 120, 255, 0.08);
  max-width: 520px;
  width: 90%;
}

.menu-card h1 {
  font-size: 2.4rem;
  margin-bottom: 8px;
  background: linear-gradient(90deg, #7eb8ff, #c4a0ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  color: #8899bb;
  margin-bottom: 36px;
  font-size: 0.95rem;
}

.difficulty-section h2 {
  font-size: 1rem;
  color: #8899bb;
  margin-bottom: 16px;
  font-weight: 500;
}

.difficulty-buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
}

.diff-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(100, 150, 255, 0.25);
  border-radius: 12px;
  padding: 16px 24px;
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
  color: #e8e8f0;
  width: 100%;
  font: inherit;
  -webkit-appearance: none;
  appearance: none;
}

.diff-btn:hover {
  background: rgba(100, 150, 255, 0.15);
  border-color: rgba(100, 150, 255, 0.5);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(80, 120, 255, 0.2);
}

.diff-btn:active {
  transform: translateY(0);
}

.diff-name {
  display: block;
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.diff-desc {
  display: block;
  font-size: 0.82rem;
  color: #7788aa;
}

.controls-hint {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 24px;
}

.controls-hint h3 {
  font-size: 0.85rem;
  color: #6677aa;
  margin-bottom: 12px;
  font-weight: 500;
}

.key-grid {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  justify-content: center;
}

.key {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 0.85rem;
  min-width: 36px;
  text-align: center;
}

.key-label {
  font-size: 0.82rem;
  color: #7788aa;
}

/* ===== 游戏画面 ===== */
#game-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* ===== HUD ===== */
#hud {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hud-top {
  position: absolute;
  top: 16px;
  left: 16px;
  right: 16px;
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.85);
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.8);
}

.hud-skills {
  position: absolute;
  bottom: 60px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
}

.skill-slot {
  background: rgba(0, 0, 0, 0.6);
  border: 2px solid rgba(255, 255, 255, 0.15);
  border-radius: 10px;
  padding: 8px 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  min-width: 64px;
  transition: all 0.3s;
}

.skill-slot.active {
  border-color: #7eb8ff;
  background: rgba(80, 120, 255, 0.2);
  box-shadow: 0 0 16px rgba(80, 120, 255, 0.4);
}

.skill-slot.empty {
  opacity: 0.4;
}

.skill-icon {
  font-size: 1.4rem;
}

.skill-name {
  font-size: 0.7rem;
  color: #aabbdd;
}

.skill-count {
  font-size: 0.85rem;
  font-weight: 700;
  color: #7eb8ff;
}

.hud-bottom {
  position: absolute;
  bottom: 16px;
  left: 16px;
  right: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}

#hud-hint {
  flex: 1;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.7);
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.8);
}

.hud-btn {
  pointer-events: all;
  background: rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  padding: 6px 14px;
  color: #ccddee;
  font-size: 0.82rem;
  cursor: pointer;
  transition: background 0.2s;
}

.hud-btn:hover {
  background: rgba(80, 120, 255, 0.3);
}

/* ===== 小地图 ===== */
#minimap {
  position: absolute;
  top: 16px;
  right: 16px;
  border: 2px solid rgba(100, 150, 255, 0.4);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.7);
  pointer-events: none;
}

/* ===== 技能弹窗 ===== */
.skill-popup {
  position: absolute;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0, 0, 0, 0.75);
  border: 2px solid #7eb8ff;
  border-radius: 16px;
  padding: 20px 32px;
  display: flex;
  align-items: center;
  gap: 16px;
  animation: popupIn 0.4s ease;
  pointer-events: none;
}

@keyframes popupIn {
  from { opacity: 0; transform: translate(-50%, -50%) scale(0.8); }
  to   { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}

.popup-icon {
  font-size: 2.5rem;
}

.popup-text {
  font-size: 1.1rem;
  color: #e8e8f0;
}

/* ===== 胜利界面 ===== */
.victory-card h1 {
  margin-bottom: 20px;
}

.victory-card p {
  color: #8899bb;
  margin-bottom: 8px;
  font-size: 1rem;
}

.primary-btn, .secondary-btn {
  display: block;
  width: 100%;
  margin-top: 12px;
  padding: 14px;
  border-radius: 10px;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
}

.primary-btn {
  background: linear-gradient(90deg, #4a7fff, #7b5fff);
  color: white;
  margin-top: 28px;
}

.primary-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(80, 120, 255, 0.4);
}

.secondary-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #aabbcc;
}

.secondary-btn:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* ===== 手机端 ===== */
.mobile-only { display: none; }
.desktop-only { display: flex; }

.mobile-controls {
  display: none;
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 500;
}

#game-screen:not(.hidden) .mobile-controls {
  display: block;
}

.joystick {
  position: absolute;
  right: 20px;
  bottom: calc(20px + env(safe-area-inset-bottom, 0px));
  pointer-events: auto;
  touch-action: none;
}

.joystick-ring {
  position: relative;
  width: 130px;
  height: 130px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, rgba(60, 80, 120, 0.55), rgba(20, 30, 50, 0.75));
  border: 2px solid rgba(140, 180, 255, 0.35);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.45), inset 0 0 20px rgba(0, 0, 0, 0.3);
}

.joystick-knob {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 52px;
  height: 52px;
  margin: -26px 0 0 -26px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, rgba(180, 210, 255, 0.9), rgba(80, 120, 200, 0.85));
  border: 2px solid rgba(200, 230, 255, 0.5);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.4);
  transition: box-shadow 0.1s;
}

.joystick-ring.active .joystick-knob {
  box-shadow: 0 0 16px rgba(120, 180, 255, 0.6);
}

.joy-hint {
  position: absolute;
  font-size: 0.65rem;
  color: rgba(180, 200, 240, 0.45);
  pointer-events: none;
  line-height: 1;
}

.joy-up    { top: 8px;  left: 50%; transform: translateX(-50%); }
.joy-down  { bottom: 8px; left: 50%; transform: translateX(-50%); }
.joy-left  { left: 8px;  top: 50%; transform: translateY(-50%); }
.joy-right { right: 8px; top: 50%; transform: translateY(-50%); }

.mobile-skill-btn {
  position: absolute;
  left: 20px;
  bottom: calc(44px + env(safe-area-inset-bottom, 0px));
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 2px solid rgba(100, 180, 255, 0.4);
  background: rgba(0, 0, 0, 0.55);
  font-size: 1.5rem;
  pointer-events: auto;
  touch-action: manipulation;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

.mobile-skill-btn:active {
  background: rgba(80, 120, 255, 0.35);
  transform: scale(0.95);
}

@media (max-width: 768px), (hover: none) and (pointer: coarse) {
  .mobile-only { display: flex; }
  .desktop-only { display: none !important; }

  #game-screen:not(.hidden) .mobile-controls {
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
    pointer-events: none;
  }

  .menu-card {
    padding: 28px 24px;
    max-height: 92dvh;
    overflow-y: auto;
  }

  .menu-card h1 { font-size: 1.8rem; }
  .subtitle { margin-bottom: 24px; font-size: 0.88rem; }

  .hud-top {
    top: 10px;
    left: 10px;
    right: 10px;
    font-size: 0.78rem;
  }

  .hud-skills {
    bottom: calc(150px + env(safe-area-inset-bottom, 0px));
    gap: 8px;
  }

  .skill-slot {
    min-width: 52px;
    padding: 6px 10px;
  }

  .skill-icon { font-size: 1.1rem; }
  .skill-name { font-size: 0.62rem; }

  .hud-bottom {
    bottom: calc(10px + env(safe-area-inset-bottom, 0px));
    left: 90px;
    right: 150px;
  }

  #hud-hint {
    font-size: 0.72rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .hud-btn {
    padding: 8px 10px;
    font-size: 0.75rem;
  }

  #minimap {
    top: 40px;
    right: 10px;
    max-width: 120px;
    max-height: 120px;
  }

  .skill-popup {
    padding: 14px 20px;
    max-width: 90%;
  }

  .popup-text { font-size: 0.95rem; }

  .joystick-ring {
    width: 118px;
    height: 118px;
  }

  .joystick-knob {
    width: 46px;
    height: 46px;
    margin: -23px 0 0 -23px;
  }
}