/**
 * style.css — 坦克大战游戏样式
 *
 * 包含：基础布局、卡片式选择界面、HUD、动画效果、Game Over 战绩展示。
 * 使用 Orbitron 字体增加科技感。
 */

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

body {
  overflow: hidden;
  background: #0a0e27;
  color: #f0f4ff;
  font-family: 'Orbitron', system-ui, -apple-system, sans-serif;
  user-select: none;
  -webkit-user-select: none;
}

/* ===== 游戏容器 ===== */
#game-container {
  position: relative;
  width: 100vw;
  height: 100vh;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
}

#ui-layer {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 10;
}

/* ===== 屏幕覆盖层（菜单/死亡/GameOver） ===== */
.screen {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(8, 12, 32, 0.92);
  padding: 2.5rem 3rem;
  border-radius: 1.2rem;
  text-align: center;
  pointer-events: auto;
  border: 1px solid rgba(56, 189, 248, 0.2);
  box-shadow:
    0 0 40px rgba(56, 189, 248, 0.08),
    0 20px 40px rgba(0, 0, 0, 0.5);
  max-width: 680px;
  width: 92%;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  animation: fadeIn 0.3s ease-out;
  display: none; /* 默认隐藏，由JS控制显示 */
}

@keyframes fadeIn {
  from { opacity: 0; transform: translate(-50%, -50%) scale(0.95); }
  to { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}

@keyframes fadeOut {
  from { opacity: 1; }
  to { opacity: 0; }
}

/* ===== 标题 ===== */
.title-glow {
  color: #38bdf8;
  font-size: 2rem;
  margin-bottom: 0.5rem;
  text-shadow: 0 0 20px rgba(56, 189, 248, 0.5);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { text-shadow: 0 0 20px rgba(56, 189, 248, 0.5); }
  50% { text-shadow: 0 0 35px rgba(56, 189, 248, 0.8), 0 0 60px rgba(56, 189, 248, 0.3); }
}

.subtitle {
  color: #94a3b8;
  font-size: 0.95rem;
  margin-bottom: 1.8rem;
  font-family: system-ui, sans-serif;
}

/* ===== 卡片式选择布局 ===== */
.card-grid {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.card {
  background: rgba(30, 41, 59, 0.6);
  border: 1px solid rgba(56, 189, 248, 0.15);
  border-radius: 1rem;
  padding: 1.2rem 1rem;
  width: 170px;
  cursor: pointer;
  transition: all 0.25s ease;
  text-align: center;
  color: #e2e8f0;
  font-family: inherit;
  font-size: inherit;
}

.card:hover {
  border-color: rgba(56, 189, 248, 0.5);
  background: rgba(30, 41, 59, 0.9);
  transform: translateY(-4px);
  box-shadow: 0 8px 25px rgba(56, 189, 248, 0.15);
}

.card:active {
  transform: translateY(-1px);
}

.card-icon {
  font-size: 2.5rem;
  margin-bottom: 0.6rem;
}

.card-title {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 0.5rem;
  color: #38bdf8;
}

.card-desc {
  font-family: system-ui, sans-serif;
  font-size: 0.75rem;
  color: #94a3b8;
  line-height: 1.5;
}

/* ===== 按钮 ===== */
.btn-primary {
  background: linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);
  color: white;
  border: none;
  padding: 0.85rem 2rem;
  font-size: 1.1rem;
  font-weight: 700;
  border-radius: 0.6rem;
  cursor: pointer;
  margin-top: 1.5rem;
  transition: all 0.2s ease;
  font-family: inherit;
  letter-spacing: 0.5px;
}

.btn-primary:hover {
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(14, 165, 233, 0.3);
}

.btn-secondary {
  background: linear-gradient(135deg, #475569 0%, #334155 100%);
  color: #e2e8f0;
  border: none;
  padding: 0.85rem 1.4rem;
  font-size: 1rem;
  font-weight: 700;
  border-radius: 0.6rem;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: inherit;
}

.btn-secondary:hover {
  background: linear-gradient(135deg, #334155 0%, #1e293b 100%);
  transform: translateY(-2px);
}

.save-confirm-box {
  margin-top: 1rem;
  padding: 1rem;
  background: rgba(15, 23, 42, 0.65);
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 0.8rem;
}

.save-confirm-title {
  color: #e2e8f0;
  font-size: 1rem;
  margin-bottom: 0.8rem;
}

.save-choice-row {
  display: flex;
  justify-content: center;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.save-submit-area {
  margin-top: 1rem;
  text-align: left;
}

.save-input-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.6rem;
}

.score-input {
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.35);
  border-radius: 0.55rem;
  padding: 0.7rem 0.8rem;
  color: #e2e8f0;
  font-size: 0.95rem;
  font-family: system-ui, sans-serif;
}

.score-input:focus {
  outline: none;
  border-color: rgba(56, 189, 248, 0.8);
  box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
}

.save-status {
  min-height: 1.3rem;
  margin-top: 0.6rem;
  color: #93c5fd;
  font-size: 0.85rem;
  font-family: system-ui, sans-serif;
}

.leaderboard-wrap {
  margin-top: 0.6rem;
  background: rgba(2, 6, 23, 0.55);
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 0.65rem;
  padding: 0.7rem;
}

.leaderboard-title {
  color: #e2e8f0;
  font-size: 0.95rem;
  margin-bottom: 0.35rem;
}

.leaderboard-list {
  margin-left: 1.2rem;
  max-height: 160px;
  overflow-y: auto;
  color: #cbd5e1;
  font-size: 0.84rem;
  font-family: system-ui, sans-serif;
  line-height: 1.45;
}

/* ===== Game Over 战绩统计 ===== */
.stats-grid {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin: 1.5rem 0;
  flex-wrap: wrap;
}

.stat-item {
  background: rgba(30, 41, 59, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 0.8rem;
  padding: 1rem 1.5rem;
  min-width: 100px;
}

.stat-value {
  font-size: 1.8rem;
  font-weight: 700;
  color: #fbbf24;
}

.stat-label {
  font-family: system-ui, sans-serif;
  font-size: 0.75rem;
  color: #64748b;
  margin-top: 0.3rem;
}

/* ===== HUD（Canvas绘制，此处仅占位） ===== */
.hud {
  position: absolute;
  top: 0; left: 0;
  pointer-events: none;
}

/* ===== 升级提示 ===== */
@keyframes floatUp {
  0% { opacity: 0; transform: translate(-50%, 0); }
  20% { opacity: 1; transform: translate(-50%, -20px); }
  80% { opacity: 1; transform: translate(-50%, -40px); }
  100% { opacity: 0; transform: translate(-50%, -60px); }
}

.upgrade-message {
  background: rgba(0, 0, 0, 0.7);
  padding: 1rem 2rem;
  border-radius: 8px;
  border: 1px solid #fbbf24;
  box-shadow: 0 0 15px rgba(251, 191, 36, 0.3);
}

#codex-button {
  position: absolute;
  right: 160px;
  top: 12px;
  width: 88px;
  height: 72px;
  border: 1px solid rgba(148, 163, 184, 0.35);
  border-radius: 14px 14px 6px 6px;
  background: linear-gradient(180deg, rgba(30, 41, 59, 0.92) 0%, rgba(15, 23, 42, 0.98) 100%);
  color: #e2e8f0;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  pointer-events: auto;
  cursor: pointer;
  z-index: 21;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45), 0 0 20px rgba(59, 130, 246, 0.2);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

#codex-button .book {
  font-size: 1.45rem;
  line-height: 1;
}

#codex-button .tip {
  font-size: 0.72rem;
  letter-spacing: 1px;
  color: #cbd5e1;
}

#codex-button:hover {
  transform: translateY(-6px);
  border-color: rgba(125, 211, 252, 0.65);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.55), 0 0 28px rgba(56, 189, 248, 0.28);
}

#codex-panel {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: min(980px, 92vw);
  max-height: 84vh;
  overflow: auto;
  background: rgba(8, 12, 32, 0.95);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: 16px;
  padding: 1.25rem;
  display: none;
  pointer-events: auto;
  z-index: 30;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.55), 0 0 50px rgba(56, 189, 248, 0.08);
}

.codex-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  gap: 1rem;
}

.codex-header h3 {
  color: #7dd3fc;
  font-size: 1.3rem;
}

.codex-close-btn {
  border: 1px solid rgba(125, 211, 252, 0.45);
  background: rgba(15, 23, 42, 0.8);
  color: #e2e8f0;
  border-radius: 10px;
  padding: 0.5rem 0.9rem;
  font-family: inherit;
  cursor: pointer;
}

.codex-close-btn:hover {
  background: rgba(30, 41, 59, 0.92);
}

.codex-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.codex-column {
  background: rgba(15, 23, 42, 0.75);
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 12px;
  padding: 0.8rem;
}

.codex-column h4 {
  color: #f8fafc;
  margin-bottom: 0.7rem;
  font-size: 1rem;
}

.codex-list {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.codex-item {
  display: grid;
  grid-template-columns: 52px 1fr;
  align-items: center;
  gap: 0.6rem;
  background: rgba(30, 41, 59, 0.72);
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 10px;
  padding: 0.55rem;
}

.codex-item.enemy-entry {
  grid-template-columns: 98px 1fr;
}

.codex-art {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: radial-gradient(circle at 30% 20%, #334155 0%, #0f172a 100%);
  border: 1px solid rgba(125, 211, 252, 0.25);
  font-size: 1.45rem;
}

.codex-art.enemy-art {
  width: 98px;
  height: 60px;
  padding: 0;
  overflow: hidden;
}

.codex-enemy-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.codex-text {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.codex-text strong {
  color: #f8fafc;
  font-size: 0.92rem;
}

.codex-text span {
  color: #cbd5e1;
  font-family: system-ui, sans-serif;
  font-size: 0.8rem;
  line-height: 1.35;
}

/* ===== 响应式 ===== */
@media (max-width: 600px) {
  .screen { padding: 1.5rem; }
  .title-glow { font-size: 1.5rem; }
  .card { width: 140px; padding: 1rem 0.8rem; }
  .card-icon { font-size: 2rem; }
  .stats-grid { gap: 0.8rem; }
  .stat-item { padding: 0.8rem 1rem; min-width: 80px; }
  .stat-value { font-size: 1.4rem; }
  #codex-button { right: 12px; top: 96px; width: 78px; height: 64px; }
  .codex-columns { grid-template-columns: 1fr; }
}