*{ box-sizing: border-box }

/* 显示控制：初始只显示 Start */
#startScreen{ display:block }
#gameScreen{ display:none }
#gameOverScreen{ display:none }
.show{ display:block !important }
.grid-show{ display:grid !important }

/* 背景：偏灰 & 弱化 */
body{
  margin:0; font-family:sans-serif;
  height:100vh; width:100vw;
  background:#121620 url("assets/DCicon.webp") repeat;
  background-size:120px 120px;
  animation:dcflow 30s linear infinite;
  position:relative;
}
body::after{
  content:"";
  position:fixed; inset:0;
  pointer-events:none;
  background: rgba(18,22,32,.60); /* 适当加深可到 .70 */
  z-index:0;
}
@keyframes dcflow{ 0%{background-position:0 0} 100%{background-position:-1000px -1000px} }

/* ========== START SCREEN ========== */
#startScreen{
  position:relative;
  min-height:100vh;
  padding-top:72px; /* 顶栏高度 */
  z-index:1;
}
/* 顶栏 */
#startScreen .container{
  position:fixed; top:0; left:0; right:0;
  display:flex; align-items:center; justify-content:space-between;
  gap:16px; padding:10px 16px;
  background:rgba(5,10,20,.55);
  backdrop-filter:blur(4px);
  z-index:1000;
}
#gameTitle{
  margin:0;
  font-weight:900;
  font-size:clamp(20px,3.2vw,34px);
  letter-spacing:.4px;
  color:#EAF2FF;
  text-shadow:0 2px 6px rgba(0,0,0,.35),
              0 0 10px rgba(91,213,255,.2),
              0 0 16px rgba(42,211,131,.14);
}
#startScreen .right{ display:flex; align-items:center; gap:10px }
/* 图标按钮 */
.iconBtn{
  display:inline-flex; align-items:center; gap:8px;
  padding:8px 12px; border-radius:10px;
  border:1px solid rgba(120,150,190,.25);
  background:rgba(20,28,40,.55); color:#EAF2FF; font-weight:700; cursor:pointer;
}
.iconBtn:hover{ filter:brightness(1.08) }
.ghostBtn{
  padding:8px 12px; border-radius:10px; cursor:pointer;
  border:1px solid rgba(120,150,190,.25); background:transparent; color:#cfe3ff;
}
.icon{ width:18px; height:18px; display:inline-block; background-size:contain; background-repeat:no-repeat }

/* centre */
.startArea{
  min-height: calc(100vh - 72px - 64px); /* 72 顶栏 + 64 页脚 */
  display:grid; place-items:center; gap:18px;
}
.btnPrimary{ padding:10px 16px; font-size:16px; font-weight:800; border:none; border-radius:8px; cursor:pointer; background:#2a7; color:#021 }
.btnPrimary:hover{ filter:brightness(1.08) }
.btnXL{ padding:16px 28px; font-size:22px; border-radius:12px }

/* diffculty */
.diffLabel{
  display:flex; align-items:center; gap:10px;
  background:rgba(20,28,40,.55);
  border:1px solid rgba(120,150,190,.25);
  padding:8px 12px; border-radius:10px;
}
.diffLabel .labelTitle{ font-weight:800; letter-spacing:.3px; color:#a7d0ff; text-transform:uppercase }
#diffSelect{ padding:6px 8px; border-radius:8px; border:1px solid #335; background:#0f1b2e; color:#eaf2ff }
/*foot*/
#siteFooter{ position:fixed; left:50%; bottom:14px; transform:translateX(-50%); z-index:9 }
.footerCard{
  display:flex; align-items:center; gap:10px;
  background:rgba(255,255,255,.82); color:#0c1424;
  padding:6px 12px; border-radius:12px;
  box-shadow:0 6px 20px rgba(0,0,0,.22);
}
.footerCard img{ height:28px; width:auto; display:block }
.footerCard span{ font-weight:800; white-space:nowrap }

/* ========== GAME SCREEN ========== */
#gameScreen{
  height:100vh; width:100vw;
  position:relative; z-index:1;
 
}


.gameLayout{
  display:grid;
  grid-template-columns:minmax(260px,320px) 1fr minmax(220px,260px);
  gap:16px; padding:16px; height:100%; box-sizing:border-box;
}
.panelLeft, .panel.right{
  background:rgba(0,0,0,.6);
  border:1px solid #334; border-radius:10px;
  padding:14px; color:#eaf2ff;
}
/* Score */
.score h2{ margin:0 0 6px; font-size:18px }
.scoreValue{ font-family:ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace; font-weight:700; font-size:22px; line-height:1.2; letter-spacing:1px }
/* HP */
.hp{ margin-top:14px }
.hpLabel{ font-weight:700; margin-bottom:6px }
.hpBar{ height:14px; border:1px solid #355; border-radius:8px; background:#0f1b2e; overflow:hidden }
.hpFill{ height:100%; background:linear-gradient(90deg,#2ad383,#5bd5ff) }
.hpText{ margin-top:6px }
/* Matrix */
.matrix{ margin-top:16px }
.matrix h3{ margin:0 0 8px; font-size:16px }
.grid-9x9{ display:grid; grid-template-columns:repeat(9,22px); grid-auto-rows:22px; gap:6px; counter-reset:num }
.grid-9x9 .cell{
  counter-increment:num; display:grid; place-items:center;
  background:#111a2a; border:1px solid #2a375f; border-radius:6px; color:#cfe8ff;
  font-family:ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace; font-weight:600; font-size:11px; line-height:1;
}
.grid-9x9 .cell::after{ content:counter(num) }
/* Inventory */
.inventory{ margin-top:16px }
.inventory h3{ margin:0 0 8px; font-size:16px }
.slots{ display:grid; grid-template-columns:repeat(3,1fr); gap:8px }
.slot, .slotUltimate{ height:48px; background:#111a2a; border:1px solid #2a375f; border-radius:8px }
.slotUltimate{ display:grid; grid-template-columns:auto 1fr; align-items:center; gap:6px; padding:6px }
.ultIcon{ width:36px; height:36px; background:#0f1b2e url("assets/powerup.png") center/contain no-repeat; border-radius:6px; border:1px solid #2a375f }
.ultCount{ font-family:ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace; font-weight:700; font-size:16px; color:#eaf2ff }
/* Game Area */
#gameArea{ position:relative; border:2px solid #334; border-radius:12px; background:#000; overflow:hidden; width: 600px; height: 800px; background: url('assets/bg_far.png') repeat;
  animation:starSky 30s linear infinite; }

  @keyframes starSky{ 0%{background-position:0 0} 100%{background-position:-1000px -1000px} }

.gamePlaceholder{
  position:absolute; inset:0; display:grid; place-items:center;
  color:#3ad; font-family:ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace; font-weight:700; font-size:20px; line-height:1.2; opacity:.35;pointer-events: none;z-index: 1;
  /* 将来作为武器展示区*/
}

#mainShip{
  position:absolute;
  z-index: 2;
  width: 100px;
  height: 100px;
  background-image: url('assets/player_ship.png');
  image-rendering: pixelated;
  background-repeat: no-repeat;
  background-position: center;
  overflow: visible;
  
  left: 50%;
  bottom: 20px;
  
}

.shipSprite{
  width:100%; height:100%;
  background: url('assets/player_ship.png') center/contain no-repeat;
  image-rendering:pixelated;
}


.weapon {
  /* outline: 2px dashed #27c46a; */
  display:none;
  position:absolute;
  z-index: 3;
  width: 60px;                 
  height:50px;
  background:url('assets/yellow_weapon.png') center/100% 100% no-repeat;;
  image-rendering:pixelated;
  pointer-events:none;
  left:50%;                    
  bottom:20px;                 
  transform:translateX(-50%);  
}

.boss { position: absolute;
background-position: 12.5px center;
}

.bossHp {
  position: absolute;
  left: 0;
  right: 0;
  margin: 0 auto;
  bottom: 100%;            
  transform:translateY(-6px); 
  width: 88px;             
  height: 9px;
  background: rgba(255,255,255,.18);
  border: 1px solid rgba(255,255,255,.35);
  border-radius: 6px;
  overflow: hidden;
  z-index: 2;              
}


.bossHpFill {
  height: 100%;
  width: 100%;            
  background: linear-gradient(90deg,#ff4d4f,#ff9f43);
  transition: width .12s ease;
}

/* Legend */
.panel.right h3{ margin:0 0 8px; font-size:16px }
.legend-list{ list-style:none; margin:0; padding:0; display:grid; gap:12px }
.legend-list li{ display:flex; align-items:center; gap:12px }
.spritePlayer, .spriteEnemy, .spriteBoss{
  width:32px; height:32px; border-radius:6px; background:#0f1b2e; border:1px solid #2a375f;
  image-rendering:pixelated; background-size:contain; background-repeat:no-repeat; background-position:center;
}
.spritePlayer{ background-image:url("assets/player_ship.png") }
.spriteEnemy { background-image:url("assets/enemy_medium.png") }
.spriteBoss  { background-image:url("assets/boss.png") }
/* Mobile */
@media (max-width:980px){
  .gameLayout{ grid-template-columns:1fr }
  .panel.right{ order:3 }
  .gameArea{ order:2; height:60vh }
  .panelLeft{ order:1 }
}

/* ========== GAME OVER ========== */

:root{
  --card: rgba(25,25,28,.85);
  --stroke: rgba(255,255,255,.12);
  --text: #fff;
  --muted: rgba(255,255,255,.75);
  --accent: #2ecc71; /* green */
}

/* ---- FULLSCREEN OVERLAY ---- */
#gameOverScreen{
  position: fixed;
  inset: 0;
  display: none;                 /* keep default hidden */
  place-items: center;           /* center the card */
  background: rgba(0,0,0,.6);    /* dim background */
  z-index: 10000;                /* above everything */
}

/* use this class to show it as a grid (your naming) */
#gameOverScreen.grid-show{ display: grid !important; }

/* ---- CARD ---- */
.goCard{
  width: min(92vw, 460px);
  padding: 22px;
  text-align: center;
  color: var(--text);
  background: var(--card);
  border: 1px solid var(--stroke);
  border-radius: 14px;
  box-shadow: 0 10px 24px rgba(0,0,0,.4);
  animation: fadePop .18s ease-out both;
}

#goTitle{ margin: 0 0 .3em; font-size: clamp(26px,4vw,36px); letter-spacing:.06em; }
.goSub{ margin: 0 0 1rem; color: var(--muted); }
#goScore{ color: var(--text); font-weight: 800; }

.goActions{ display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: .5rem; }

.btn{
  border: 1px solid var(--stroke);
  background: transparent;
  color: var(--text);
  padding: 10px 14px;
  border-radius: 10px;
  font-weight: 700;
  cursor: pointer;
  transition: transform .1s ease, background .1s ease;
}
.btn:hover{ transform: translateY(-1px); background: rgba(255,255,255,.06); }
.btn:active{ transform: translateY(0); }
.btn:focus-visible{ outline: 2px solid #fff; outline-offset: 2px; }

.btnRestart{
  background: var(--accent);
  color: #062b16;
  border-color: transparent;
  box-shadow: 0 6px 14px rgba(46,204,113,.35);
}
.btnRestart:hover{ background: #27c46a; }

.goTip{ margin: .25rem 0 0; font-size: 12px; color: var(--muted); }

@keyframes fadePop{
  from{ opacity: 0; transform: translateY(6px) scale(.98); }
  to{ opacity: 1; transform: translateY(0) scale(1); }
}