:root{color-scheme:dark;--bg: #0c1418;--panel: rgba(20, 31, 37, .92);--panel-soft: rgba(34, 48, 56, .82);--ink: #e9f3f1;--muted: #9fb8b2}*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:radial-gradient(circle at top left,rgba(81,162,153,.14),transparent 28%),radial-gradient(circle at top right,rgba(255,110,80,.18),transparent 24%),linear-gradient(180deg,#0f1d23,#091015);color:var(--ink);font-family:Segoe UI,PingFang SC,Microsoft YaHei,sans-serif}button{border:0;border-radius:12px;background:#24353d;color:var(--ink);cursor:pointer}button:disabled{opacity:.45;cursor:not-allowed}.shell{display:grid;grid-template-rows:auto 1fr auto;min-height:100vh;gap:12px;padding:14px;position:relative}.panel{background:var(--panel);border:1px solid rgba(150,207,195,.1);box-shadow:0 20px 40px #0000002e;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.topbar,.main{display:grid;gap:12px}.topbar{grid-template-columns:1fr auto}.stats{display:grid;grid-template-columns:repeat(5,minmax(90px,1fr));gap:8px;padding:12px}.stats div{display:grid;gap:6px;padding:10px 12px;border-radius:12px;background:linear-gradient(180deg,#39505b8a,#1d2c3399)}.stats strong{color:var(--muted);font-size:12px}.stats span{font-size:22px;font-weight:700}.controls{display:flex;align-items:center;gap:10px;padding:12px}.music-toggle{min-height:38px;padding:0 14px;background:linear-gradient(135deg,#6ee8c8,#9fdcff);color:#102026;font-weight:800;box-shadow:0 8px 18px #6fdbd22e}.music-toggle.muted-music{background:linear-gradient(135deg,#536873,#2f4149);color:#e9f3f1cc;box-shadow:none}.primary{background:linear-gradient(135deg,#f09c43,#ffcf6a);color:#182127;font-weight:700}.main{grid-template-columns:280px 1fr 300px;align-items:start}.left-panel,.right-panel .panel{padding:14px;border-radius:16px}.left-panel h2,.right-panel h2{margin:0 0 10px;font-size:16px}.board-wrap{display:flex;justify-content:center}.board{position:relative;border-radius:18px;overflow:hidden;background:linear-gradient(180deg,#ffffff05,#fff0),linear-gradient(135deg,#39625d33,#141e231a)}.cell{position:absolute;width:44px;height:44px;border-radius:0;border:1px solid rgba(72,104,113,.35);background:transparent;overflow:hidden;padding:0;font-size:11px}.cell.buildable{background:linear-gradient(135deg,#fff3b070,#d6b34f47);box-shadow:inset 0 0 0 1px #fff9cdad,inset 0 0 18px #ffe2783d}.cell.road{background:linear-gradient(180deg,#6f8e9817,#31444b1f)}.cell.wall{background:linear-gradient(135deg,#364d55,#26383f)}.cell.fragile-wall{background:linear-gradient(135deg,#5d5045,#3b312b)}.cell.danger{background:linear-gradient(135deg,#ff825242,#b33a302e),repeating-linear-gradient(135deg,rgba(255,199,111,.14) 0 6px,transparent 6px 12px)}.cell.spawn{background:linear-gradient(135deg,#4f6f7d,#2c4c57);color:#dff8f5;font-weight:700}.cell.core{background:linear-gradient(135deg,#f15a63,#f7aa65);color:#1d1b1c;font-weight:800}.cell.path{box-shadow:inset 0 0 0 999px #ff1a6652,inset 0 0 0 2px #ff4e8a,inset 0 0 22px #ff2e738a,0 0 18px #ff266e75}.cell.breach{box-shadow:inset 0 0 0 999px #ff00556b,inset 0 0 0 2px #ff81b0,inset 0 0 26px #ff397eb3,0 0 22px #ff226a94}.cell.key-blocker{box-shadow:inset 0 0 0 2px #ff6767f2,0 0 16px #ff606038}.cell.selected-tower{box-shadow:inset 0 0 0 2px #ffe58df2,0 0 18px #ffce663d}.cell.range-covered{box-shadow:inset 0 0 0 1px #ffe18452,inset 0 0 24px #ffd26c29}.cell.range-covered.support-covered{box-shadow:inset 0 0 0 1px #c7a6ff66,inset 0 0 24px #c7a6ff29}.cell.hover{outline:2px solid rgba(255,220,138,.75);outline-offset:-2px}.occupied{display:flex;align-items:center;justify-content:center}.occupant{display:grid;gap:4px;justify-items:center;width:100%;height:100%;padding-top:4px}.tag{display:inline-flex;align-items:center;justify-content:center;min-width:28px;padding:4px 6px;border-radius:999px;background:var(--accent, #f4b85a);color:#122026;font-size:12px;font-weight:700}.item-tag{font-size:11px}.fragile-tag{background:linear-gradient(135deg,#d7c0a6,#9f7c63)}.hp{width:80%;height:6px;border-radius:999px;background:#ffffff1f;overflow:hidden}.hp i{display:block;height:100%;background:linear-gradient(90deg,#72edb0,#b5ff99)}.enemy{position:absolute;width:24px;height:24px;margin-left:-12px;margin-top:-12px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:800;color:#121519;box-shadow:0 6px 14px #00000040;pointer-events:none;z-index:3}.enemy-label{position:relative;z-index:1}.enemy-hp{position:absolute;left:50%;bottom:-7px;width:28px;height:4px;transform:translate(-50%);border-radius:999px;background:#0a0e10b8;overflow:hidden}.enemy-hp i{display:block;height:100%;background:linear-gradient(90deg,#ff6e61,#f5dc6a,#72edb0)}.boss-enemy .enemy-hp{width:36px}.range-ring{position:absolute;border-radius:50%;pointer-events:none;border:3px solid rgba(255,209,106,.95);background:radial-gradient(circle,rgba(255,209,106,.16) 0%,rgba(255,209,106,.06) 48%,transparent 72%);box-shadow:inset 0 0 28px #ffd16a38,0 0 18px #ffd16a3d;z-index:4}.range-ring.support-ring{border-style:dashed}.range-center{position:absolute;width:12px;height:12px;margin-left:-6px;margin-top:-6px;border-radius:50%;pointer-events:none;z-index:5}.range-label{position:absolute;transform:translate(-50%,-100%);padding:4px 8px;border:1px solid rgba(255,255,255,.16);border-radius:999px;color:#eff7f6;font-size:11px;font-weight:700;white-space:nowrap;pointer-events:none;z-index:5}.message{padding:10px 12px;border-radius:12px;background:#ffffff0a}.wave-preview{display:grid;gap:8px;margin-top:12px;padding:10px 12px;border-left:3px solid #8adcc8;background:#ffffff0a}.wave-preview ul{display:grid;gap:4px;margin:0;padding-left:18px;color:var(--muted)}.muted{color:var(--muted);line-height:1.6}.selected-card{display:grid;gap:8px;margin-top:12px;padding:14px;border-radius:16px;background:linear-gradient(180deg,#30424ddb,#1d2930e6),var(--panel-soft);border:1px solid rgba(255,255,255,.08)}.selected-card h3{margin:0}.selected-actions{display:grid;grid-template-columns:1fr;gap:8px;margin-top:6px}.selected-actions button{min-height:46px;padding:10px 12px;border:1px solid rgba(255,255,255,.12);font-size:14px;font-weight:800;letter-spacing:.02em;transition:transform .12s ease,box-shadow .12s ease,filter .12s ease}.selected-actions button:hover:not(:disabled){transform:translateY(-1px);filter:brightness(1.06)}.selected-actions button:active:not(:disabled){transform:translateY(0)}.selected-actions .action-upgrade{background:linear-gradient(135deg,#f3b34e,#ffd975);color:#182127;box-shadow:0 8px 18px #f3b34e38}.selected-actions .action-downgrade{background:linear-gradient(135deg,#76d7ff,#9fffd6);color:#11222a;box-shadow:0 8px 18px #76d7ff2e}.selected-actions .action-sell{background:linear-gradient(135deg,#ff7b71,#ffb174);color:#24181a;box-shadow:0 8px 18px #ff7b7133}.selected-actions button:disabled{background:linear-gradient(180deg,#455760c2,#2e3c44d1);color:#e9f3f1ad;box-shadow:none;border-color:#ffffff0f}.tower-bar{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:10px}.bottom-bar{padding:14px;border-radius:18px}.bar-title{margin-bottom:10px;color:var(--muted);font-size:13px}.tower-card,.inventory-card,.shop-card,.ghost{display:grid;gap:6px;align-content:start;min-height:98px;padding:12px;border:1px 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36%)}.shop-panel-header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}.shop-panel-header h2{margin:0;font-size:20px}.shop-close{min-height:40px;padding:0 14px;border:1px solid rgba(255,255,255,.12);background:linear-gradient(135deg,#526872e6,#2d3c44f5);color:var(--ink);font-weight:700}#shop{grid-template-columns:repeat(2,minmax(0,1fr))}#shop .ghost{grid-column:1 / -1;min-height:56px;align-content:center}.intro-screen{position:fixed;inset:0;z-index:20;display:grid;place-items:center;padding:24px;background:linear-gradient(180deg,#080f12d1,#080f12eb),radial-gradient(circle at 20% 20%,rgba(105,202,184,.16),transparent 28%),radial-gradient(circle at 80% 15%,rgba(255,124,86,.16),transparent 22%);transition:opacity .22s ease,visibility .22s ease}.intro-screen.is-hidden{opacity:0;visibility:hidden;pointer-events:none}.intro-card{width:min(860px,100%);padding:28px;border-radius:24px;display:grid;gap:18px;background:linear-gradient(180deg,#203039f5,#11191ff5),linear-gradient(135deg,rgba(244,182,86,.08),transparent 35%)}.intro-kicker{margin:0;color:#8adcc8;font-size:13px;letter-spacing:.16em;text-transform:uppercase}.intro-card h1{margin:0;font-size:clamp(34px,5vw,56px);line-height:1.05}.intro-copy{margin:0;color:var(--muted);line-height:1.7;font-size:16px;max-width:720px}.intro-rules{display:grid;gap:10px;padding:18px 20px;border-radius:18px;background:#ffffff0a;border:1px solid rgba(255,255,255,.08)}.intro-rules h2{margin:0;font-size:18px}.intro-rules ul{margin:0;padding-left:20px;color:var(--muted);line-height:1.75}.intro-actions{display:flex;justify-content:flex-start}.intro-start{min-width:180px;min-height:52px;font-size:18px}@media(max-width:1320px){.main{grid-template-columns:1fr}.board-wrap{order:-1;overflow:auto}.tower-bar{grid-template-columns:repeat(3,minmax(0,1fr))}.stats{grid-template-columns:repeat(2,minmax(0,1fr))}.shop-panel{padding:16px}.shop-panel-card{width:min(680px,100%)}}@media(max-width:760px){#shop{grid-template-columns:1fr}.shop-panel-card{max-height:calc(100vh - 32px);padding:16px}.shop-panel-header{align-items:flex-start}.shop-close{min-height:38px;padding:0 12px}}