:root{--bg-color: #0f172a;--panel-bg: #1e293b;--box-bg: #0f172a;--border-color: #334155;--primary-color: #38bdf8;--accent-color: #f43f5e;--text-main: #f8fafc;--text-muted: #94a3b8;--font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-main);font-family:var(--font-family);min-height:100vh;display:flex;justify-content:center;align-items:center;-webkit-user-select:none;user-select:none}#app{width:100%;max-width:900px;padding:16px}.game-container{display:flex;flex-direction:column;gap:16px;background:var(--panel-bg);padding:24px;border-radius:16px;box-shadow:0 10px 30px #00000080;border:1px solid var(--border-color)}.header{display:flex;justify-content:space-between;align-items:center;border-bottom:2px solid var(--border-color);padding-bottom:12px}.title{font-size:24px;font-weight:800;letter-spacing:2px;color:var(--primary-color)}.badge{font-size:12px;background:var(--accent-color);color:#fff;padding:2px 8px;border-radius:4px;vertical-align:middle}.main-layout{display:flex;gap:20px;justify-content:center;align-items:flex-start}.panel{display:flex;flex-direction:column;gap:16px;width:160px}.box{background:var(--box-bg);border:1px solid var(--border-color);border-radius:10px;padding:12px;display:flex;flex-direction:column;align-items:center}.box h2{font-size:14px;color:var(--text-muted);margin-bottom:8px;letter-spacing:1px}.desc{font-size:12px;color:var(--text-muted);text-align:center;margin-top:4px;margin-bottom:8px}.board-container{position:relative;background:var(--box-bg);border:2px solid var(--border-color);border-radius:8px;overflow:hidden;box-shadow:0 0 20px #0006}#game-canvas{display:block}.overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:#0f172ad9;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;justify-content:center;align-items:center;z-index:10;transition:opacity .2s ease}.overlay.hidden{display:none}.overlay-card{background:var(--panel-bg);border:1px solid var(--border-color);border-radius:12px;padding:24px;width:80%;max-width:260px;text-align:center;box-shadow:0 8px 24px #0009}.stats-box{align-items:stretch;gap:10px}.stat-item{display:flex;flex-direction:column;align-items:center}.stat-item .label{font-size:11px;color:var(--text-muted)}.stat-item .value{font-size:18px;font-weight:700;color:var(--primary-color)}.hud-stats{width:100%;display:flex;flex-direction:column;gap:8px;margin-top:8px}.hud-item{display:flex;justify-content:space-between;font-size:13px;border-top:1px dashed var(--border-color);padding-top:4px}.controls-guide{display:flex;flex-wrap:wrap;justify-content:center;gap:16px;font-size:12px;color:var(--text-muted);border-top:1px solid var(--border-color);padding-top:12px}.btn{background:var(--primary-color);color:#0f172a;font-weight:700;border:none;padding:8px 16px;border-radius:6px;cursor:pointer;transition:all .15s ease}.btn:hover{filter:brightness(1.1);transform:translateY(-1px)}.btn.secondary{background:#334155;color:var(--text-main)}.btn.danger{background:var(--accent-color);color:#fff}.mode-select-list{display:flex;flex-direction:column;gap:10px;margin:16px 0}.mode-btn{background:#334155;color:var(--text-main);border:1px solid var(--border-color);border-radius:8px;padding:10px;cursor:pointer;text-align:left;transition:all .2s ease}.mode-btn:hover{background:#475569;border-color:var(--primary-color)}.mode-btn.active{border-color:var(--primary-color);background:#0f172a}.mode-btn .mode-name{font-weight:700;font-size:14px;color:var(--primary-color)}.mode-btn .mode-desc{font-size:11px;color:var(--text-muted)}