/* 太空探索遊戲科幻風格樣式表 (Sci-Fi Space Explorer Stylesheet) */
:root {
  --primary-glow: #38bdf8;
  --accent-cyan: #06b6d4;
  --accent-gold: #fbbf24;
  --accent-green: #22c55e;
  --accent-red: #ef4444;
  --hud-bg: rgba(11, 15, 25, 0.78);
  --hud-border: rgba(56, 189, 248, 0.35);
  --text-main: #f8fafc;
  --text-dim: #94a3b8;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
  -webkit-user-select: none;
}

body, html {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: #060713;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  color: var(--text-main);
}

/* 主畫布 */
#space-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: block;
  z-index: 1;
}

/* 遊戲 UI 容器 */
#ui-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
  pointer-events: none; /* 穿透至 Canvas，個別 UI 元件開啟 pointer-events */
}

/* 頂部導航儀錶列 */
.top-hud-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 20px;
  background: linear-gradient(180deg, rgba(6, 9, 20, 0.88) 0%, rgba(6, 9, 20, 0.4) 70%, transparent 100%);
  pointer-events: auto;
}

.telemetry-box {
  display: flex;
  gap: 16px;
  background: var(--hud-bg);
  border: 1px solid var(--hud-border);
  padding: 8px 16px;
  border-radius: 10px;
  backdrop-filter: blur(8px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.telemetry-item {
  display: flex;
  flex-direction: column;
}

.hp-item {
  min-width: 140px;
}

.hp-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 3px;
}

.hp-text {
  font-size: 12px;
  font-weight: bold;
  font-family: monospace;
}

.hp-bar-track {
  width: 100%;
  height: 8px;
  background: rgba(15, 23, 42, 0.85);
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.hp-bar-fill {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, #22c55e, #4ade80);
  border-radius: 4px;
  transition: width 0.15s ease, background 0.25s ease;
}

.item-label {
  font-size: 11px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.item-value {
  font-size: 16px;
  font-weight: 700;
  color: #38bdf8;
  font-variant-numeric: tabular-nums;
}

.text-gold {
  color: var(--accent-gold);
}

/* 行星快捷導航切換條 */
.planet-nav-scroll {
  display: flex;
  gap: 8px;
  background: var(--hud-bg);
  border: 1px solid var(--hud-border);
  padding: 6px 12px;
  border-radius: 24px;
  backdrop-filter: blur(8px);
  max-width: 50vw;
  overflow-x: auto;
}

.planet-nav-scroll::-webkit-scrollbar {
  display: none;
}

.planet-nav-chip {
  display: flex;
  align-items: center;
  gap: 5px;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-main);
  padding: 4px 10px;
  border-radius: 14px;
  cursor: pointer;
  font-size: 12px;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.planet-nav-chip:hover {
  background: rgba(56, 189, 248, 0.25);
  border-color: var(--primary-glow);
  transform: translateY(-1px);
}

.planet-nav-chip.conquered {
  border-color: rgba(34, 197, 94, 0.6);
  background: rgba(34, 197, 94, 0.15);
}

.chip-order {
  display: inline-block;
  width: 16px;
  height: 16px;
  line-height: 16px;
  text-align: center;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  font-size: 10px;
  font-weight: bold;
}

.chip-flag {
  font-size: 10px;
}

/* 右側雷達小地圖與控制區 */
.top-right-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.radar-wrapper {
  position: relative;
  background: var(--hud-bg);
  border: 1px solid var(--hud-border);
  border-radius: 8px;
  padding: 4px;
  backdrop-filter: blur(8px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

#radar-canvas {
  display: block;
  width: 240px;
  height: 64px;
  background: #030712;
  border-radius: 4px;
}

.radar-label {
  position: absolute;
  bottom: 2px;
  right: 6px;
  font-size: 9px;
  color: var(--text-dim);
  letter-spacing: 1px;
}

.icon-btn {
  background: var(--hud-bg);
  border: 1px solid var(--hud-border);
  color: var(--text-main);
  font-size: 16px;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  backdrop-filter: blur(8px);
}

.icon-btn:hover {
  background: rgba(56, 189, 248, 0.2);
  border-color: var(--primary-glow);
}

.difficulty-select {
  background: var(--hud-bg);
  border: 1px solid var(--hud-border);
  color: #38bdf8;
  font-size: 12px;
  font-weight: bold;
  padding: 6px 10px;
  border-radius: 8px;
  cursor: pointer;
  outline: none;
  backdrop-filter: blur(8px);
}

.difficulty-select option {
  background: #0f172a;
  color: #f1f5f9;
}

/* 畫面中央導航指南針與目標指示 */
.center-compass-hud {
  position: absolute;
  top: 90px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--hud-bg);
  border: 1px solid var(--hud-border);
  padding: 6px 16px;
  border-radius: 30px;
  backdrop-filter: blur(8px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  pointer-events: auto;
}

.compass-dial {
  width: 28px;
  height: 28px;
  border: 2px solid rgba(56, 189, 248, 0.5);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

#compass-arrow {
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-bottom: 12px solid #38bdf8;
  transform-origin: center bottom;
  transition: transform 0.1s linear;
}

.target-details {
  display: flex;
  flex-direction: column;
}

#hud-target {
  font-size: 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 6px;
}

#hud-dist {
  font-size: 11px;
  color: var(--text-dim);
}

.status-badge {
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 6px;
  font-weight: normal;
}

.status-badge.conquered {
  background: rgba(34, 197, 94, 0.25);
  color: #4ade80;
  border: 1px solid #22c55e;
}

.status-badge.pending {
  background: rgba(234, 179, 8, 0.2);
  color: #facc15;
  border: 1px solid #eab308;
}

.status-badge.manual {
  background: rgba(148, 163, 184, 0.15);
  color: #cbd5e1;
  border: 1px solid rgba(148, 163, 184, 0.3);
}

.status-badge.auto-active {
  background: rgba(6, 182, 212, 0.25);
  color: #00e5ff;
  border: 1px solid #00e5ff;
  box-shadow: 0 0 10px rgba(0, 229, 255, 0.4);
  animation: pulseGlow 1.5s infinite;
}

.status-badge.defense-badge {
  background: rgba(239, 68, 68, 0.25);
  color: #f87171;
  border: 1px solid #ef4444;
  animation: pulseGlow 1.2s infinite;
}

/* 自動導航按鈕組件 */
.autopilot-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: 8px;
  padding-left: 12px;
  border-left: 1px solid rgba(56, 189, 248, 0.25);
}

.action-auto-btn {
  background: rgba(15, 23, 42, 0.8);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.5);
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: bold;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  white-space: nowrap;
}

.action-auto-btn:hover {
  background: rgba(56, 189, 248, 0.2);
  border-color: #00e5ff;
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.4);
}

.action-auto-btn.active {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.6) 0%, rgba(2, 132, 199, 0.7) 100%);
  color: #ffffff;
  border-color: #00e5ff;
  box-shadow: 0 0 18px rgba(0, 229, 255, 0.65);
  animation: autoBtnPulse 1.8s infinite;
}

@keyframes autoBtnPulse {
  0%, 100% { box-shadow: 0 0 12px rgba(0, 229, 255, 0.4); }
  50% { box-shadow: 0 0 24px rgba(0, 229, 255, 0.8); }
}

/* 深空迷航警告橫幅 (防呆導航) */
.lost-warning-banner {
  position: absolute;
  top: 150px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(15, 23, 42, 0.92);
  border: 2px solid #ef4444;
  padding: 8px 18px;
  border-radius: 30px;
  backdrop-filter: blur(10px);
  box-shadow: 0 0 25px rgba(239, 68, 68, 0.6);
  animation: lostAlertShake 3s infinite;
  pointer-events: auto;
}

@keyframes lostAlertShake {
  0%, 100% { transform: translateX(-50%); }
  92% { transform: translateX(-50%); }
  94% { transform: translateX(calc(-50% - 4px)); }
  96% { transform: translateX(calc(-50% + 4px)); }
  98% { transform: translateX(-50%); }
}

.lost-text {
  font-size: 13px;
  font-weight: bold;
  color: #fca5a5;
}

.btn-lost-nav {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%) !important;
  color: #ffffff !important;
  border-color: #fca5a5 !important;
  box-shadow: 0 0 12px rgba(239, 68, 68, 0.5) !important;
}

/* 行星接近警報與降落按鈕 */
.proximity-banner {
  position: absolute;
  top: 155px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  animation: pulseGlow 1.8s infinite;
  pointer-events: auto;
}

@keyframes pulseGlow {
  0%, 100% { filter: drop-shadow(0 0 10px rgba(56, 189, 248, 0.4)); }
  50% { filter: drop-shadow(0 0 22px rgba(56, 189, 248, 0.85)); }
}

.alert-text {
  background: rgba(2, 132, 199, 0.85);
  color: #ffffff;
  font-weight: bold;
  padding: 6px 18px;
  border-radius: 20px;
  font-size: 13px;
  letter-spacing: 0.5px;
  border: 1px solid #7dd3fc;
}

.proximity-banner.defense-alert .alert-text {
  background: rgba(220, 38, 38, 0.9);
  border-color: #f87171;
  color: #ffffff;
  box-shadow: 0 0 20px rgba(239, 68, 68, 0.7);
}

.action-land-btn {
  background: linear-gradient(135deg, #0284c7 0%, #2563eb 100%);
  color: #ffffff;
  border: 2px solid #38bdf8;
  padding: 10px 24px;
  border-radius: 30px;
  font-size: 15px;
  font-weight: bold;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 4px 25px rgba(2, 132, 199, 0.6);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.action-land-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 30px rgba(2, 132, 199, 0.9);
}

/* 左下角操作按鍵提示 */
.controls-guide-card {
  position: absolute;
  bottom: 20px;
  left: 20px;
  background: var(--hud-bg);
  border: 1px solid var(--hud-border);
  padding: 12px 16px;
  border-radius: 12px;
  backdrop-filter: blur(8px);
  pointer-events: auto;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.guide-title {
  font-size: 12px;
  font-weight: bold;
  color: var(--primary-glow);
  margin-bottom: 8px;
  letter-spacing: 0.5px;
}

.guide-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-size: 12px;
  color: var(--text-dim);
}

kbd {
  background: #1e293b;
  border: 1px solid #475569;
  border-radius: 4px;
  padding: 1px 6px;
  font-family: monospace;
  font-size: 11px;
  color: #f1f5f9;
  box-shadow: 0 2px 0 #0f172a;
}

/* 行動端觸控按鈕 (預設在小螢幕顯示) */
.mobile-touch-controls {
  position: absolute;
  bottom: 20px;
  left: 0;
  width: 100%;
  display: flex;
  justify-content: space-between;
  padding: 0 24px;
  pointer-events: none;
}

.touch-cluster-left, .touch-cluster-right, .touch-cluster-weapons {
  display: flex;
  gap: 10px;
  pointer-events: auto;
}

.touch-cluster-weapons {
  margin: 0 auto;
}

.touch-btn {
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: rgba(15, 23, 42, 0.75);
  border: 2px solid var(--hud-border);
  color: #ffffff;
  font-size: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(6px);
  cursor: pointer;
  transition: transform 0.1s, background 0.1s;
}

.touch-btn:active {
  transform: scale(0.92);
  background: rgba(56, 189, 248, 0.4);
}

.touch-btn span {
  font-size: 10px;
  font-weight: bold;
  color: var(--text-dim);
  margin-top: 2px;
}

.btn-boost {
  border-color: #38bdf8;
  background: rgba(2, 132, 199, 0.4);
}

.btn-brake {
  border-color: #f87171;
}

/* 戰鬥武器觸控按鈕 */
.btn-laser {
  border-color: #00e5ff;
  background: rgba(6, 182, 212, 0.35);
}

.btn-laser:active {
  background: rgba(0, 229, 255, 0.6);
}

.btn-missile {
  border-color: #f97316;
  background: rgba(249, 115, 22, 0.35);
}

.btn-missile:active {
  background: rgba(249, 115, 22, 0.6);
}

.btn-proton {
  border-color: #a855f7;
  background: rgba(168, 85, 247, 0.35);
}

.btn-proton:active {
  background: rgba(168, 85, 247, 0.6);
}

.defeat-modal {
  border-color: #ef4444;
  box-shadow: 0 0 50px rgba(239, 68, 68, 0.5);
}

/* 隱藏輔助類別 */
.hidden {
  display: none !important;
}

/* 彈窗遮罩與全螢幕模態框 (Modal Overlay) */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(4, 7, 16, 0.85);
  backdrop-filter: blur(12px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.sci-fi-modal {
  background: linear-gradient(180deg, #0b1329 0%, #060b18 100%);
  border: 2px solid #38bdf8;
  border-radius: 16px;
  width: 100%;
  max-width: 580px;
  box-shadow: 0 0 45px rgba(56, 189, 248, 0.35);
  overflow: hidden;
  animation: modalEnter 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalEnter {
  from { opacity: 0; transform: scale(0.92) translateY(15px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  background: rgba(56, 189, 248, 0.08);
  border-bottom: 1px solid rgba(56, 189, 248, 0.25);
}

.modal-header h2 {
  font-size: 18px;
  color: #38bdf8;
  letter-spacing: 0.5px;
}

.close-btn {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 20px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
}

.close-btn:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.1);
}

.modal-body {
  padding: 24px;
}

.quiz-step {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.step-badge {
  display: inline-block;
  font-size: 12px;
  font-weight: bold;
  color: var(--accent-gold);
  background: rgba(251, 191, 36, 0.12);
  border: 1px solid rgba(251, 191, 36, 0.3);
  padding: 3px 10px;
  border-radius: 12px;
  align-self: flex-start;
}

.question-text {
  font-size: 16px;
  line-height: 1.5;
  color: #f1f5f9;
}

/* 順序選擇題選項網格 */
.options-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-top: 8px;
}

.quiz-option-btn {
  background: rgba(30, 41, 59, 0.8);
  border: 1px solid #475569;
  color: #f1f5f9;
  padding: 14px 8px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.quiz-option-btn:hover {
  background: rgba(56, 189, 248, 0.2);
  border-color: var(--primary-glow);
  transform: translateY(-2px);
}

.quiz-option-btn.correct {
  background: rgba(34, 197, 94, 0.3) !important;
  border-color: #22c55e !important;
  color: #4ade80 !important;
}

.quiz-option-btn.wrong {
  background: rgba(239, 68, 68, 0.3) !important;
  border-color: #ef4444 !important;
  color: #f87171 !important;
  animation: shake 0.3s;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  75% { transform: translateX(6px); }
}

/* 拼寫輸入組件 */
.spelling-box {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.spelling-input-row {
  display: flex;
  gap: 8px;
}

#spelling-input {
  flex: 1;
  background: #0f172a;
  border: 2px solid #38bdf8;
  color: #38bdf8;
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 20px;
  font-weight: bold;
  letter-spacing: 2px;
  text-transform: uppercase;
  outline: none;
  text-align: center;
}

#spelling-input:focus {
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.5);
}

.speak-btn {
  background: #1e293b;
  border: 1px solid #475569;
  color: #f1f5f9;
  padding: 0 16px;
  border-radius: 10px;
  font-size: 13px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
}

.speak-btn:hover {
  background: rgba(56, 189, 248, 0.2);
  border-color: var(--primary-glow);
}

/* 字母瓷磚組 */
.tiles-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin: 6px 0;
}

.letter-tile {
  width: 44px;
  height: 44px;
  background: #1e293b;
  border: 1px solid #64748b;
  color: #ffffff;
  font-size: 18px;
  font-weight: bold;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s;
  box-shadow: 0 3px 0 #0f172a;
}

.letter-tile:hover {
  background: #0284c7;
  border-color: #38bdf8;
  transform: translateY(-2px);
}

.letter-tile:active {
  transform: translateY(1px);
  box-shadow: none;
}

.spelling-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7 0%, #2563eb 100%);
  color: #ffffff;
  border: 1px solid #38bdf8;
  padding: 10px 24px;
  border-radius: 8px;
  font-weight: bold;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-primary:hover {
  box-shadow: 0 0 16px rgba(56, 189, 248, 0.5);
}

.btn-secondary {
  background: #1e293b;
  border: 1px solid #475569;
  color: var(--text-dim);
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
}

.btn-secondary:hover {
  color: #ffffff;
  background: #334155;
}

.feedback-msg {
  min-height: 24px;
  font-size: 14px;
  text-align: center;
  font-weight: 500;
}

.text-green { color: #4ade80; }
.text-red { color: #f87171; }

/* 成功插旗儀式與科普卡片 */
.flag-badge-box {
  text-align: center;
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.35);
  border-radius: 12px;
  padding: 18px;
}

.flag-icon-anim {
  font-size: 42px;
  margin-bottom: 6px;
  animation: bounce 0.6s infinite alternate;
}

@keyframes bounce {
  from { transform: translateY(0); }
  to { transform: translateY(-8px); }
}

.flag-badge-box h3 {
  font-size: 20px;
  color: #4ade80;
  margin-bottom: 6px;
}

.flag-badge-box .tagline {
  font-size: 13px;
  color: var(--text-dim);
}

.flag-badge-box .tagline strong {
  color: #ffffff;
}

.encyclopedia-card {
  background: rgba(15, 23, 42, 0.85);
  border-left: 4px solid #38bdf8;
  border-radius: 8px;
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 13px;
  line-height: 1.6;
}

.encyclopedia-card h4 {
  color: #38bdf8;
  font-size: 14px;
}

.encyclopedia-card em {
  color: #cbd5e1;
}

/* 全通關儀式 Modal */
.victory-card {
  text-align: center;
  padding: 30px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.trophy-anim {
  font-size: 64px;
  animation: pulse 1.2s infinite alternate;
}

.victory-card h2 {
  font-size: 26px;
  color: var(--accent-gold);
  text-shadow: 0 0 20px rgba(251, 191, 36, 0.6);
}

.victory-card p {
  color: #cbd5e1;
  font-size: 15px;
  line-height: 1.6;
  max-width: 440px;
}

.victory-actions {
  display: flex;
  gap: 14px;
  margin-top: 10px;
}

/* 響應式優化 */
@media (max-width: 768px) {
  .controls-guide-card {
    display: none; /* 手機端隱藏桌面鍵盤提示 */
  }
  .planet-nav-scroll {
    max-width: 90vw;
  }
  .top-hud-bar {
    flex-direction: column;
    gap: 8px;
    align-items: stretch;
  }
  .radar-wrapper {
    display: none;
  }
  .center-compass-hud {
    top: 130px;
  }
  .options-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}