:root{--primary-color:#1e88e5;--primary-dark:#0d47a1;--text-primary:#333;--text-secondary:#666;--background-light:#f5f7fa;--border-color:#e0e0e0;--shadow-color:rgba(0, 0, 0, 0.08);--transition-speed:0.3s}*{margin:0;padding:0;box-sizing:border-box;font-family:'Noto Sans SC','Microsoft YaHei',sans-serif}body{background-color:var(--background-light);color:var(--text-primary);line-height:1.8;min-height:100vh;display:flex;flex-direction:column;font-size:16px;overflow-x:hidden}header{background:linear-gradient(135deg,var(--primary-color),var(--primary-dark));color:#fff;padding:1rem 2rem;text-align:center;box-shadow:0 4px 12px var(--shadow-color)}header h1{margin-bottom:.75rem;font-size:2.2rem;font-weight:700;letter-spacing:2px}.mode-selector{display:flex;align-items:center;position:relative}.mode-selector button{padding:.5rem 1.5rem;border:2px solid rgba(255,255,255,.2);border-radius:8px;background-color:rgba(255,255,255,.1);color:#fff;font-size:1rem;cursor:pointer;transition:all var(--transition-speed);flex:1}.mode-selector button:hover{background-color:rgba(255,255,255,.2);transform:translateY(-3px)}.mode-selector button.active{background-color:#fff;color:var(--primary-color);font-weight:600}main{flex:1;padding:1.5rem 2rem 1rem}.main-content{max-width:1600px;margin:0 auto;display:flex;gap:2rem;height:calc(100vh - 130px);min-height:500px}.country-list-container{flex:0 0 300px;background:#fff;border-radius:12px;padding:1.5rem;box-shadow:0 4px 12px var(--shadow-color);height:100%;transition:all var(--transition-speed) ease;position:relative;overflow:hidden;display:flex;flex-direction:column;min-width:300px;width:300px}.country-list-container h2{margin-bottom:1.5rem;color:var(--primary-color);font-size:1.5rem;text-align:center}.search-box{margin-bottom:1.5rem}.search-box input{width:100%;padding:1rem;border:2px solid var(--border-color);border-radius:8px;font-size:1rem;transition:all var(--transition-speed)}.search-box input:focus{border-color:var(--primary-color);outline:0;box-shadow:0 0 0 3px rgba(30,136,229,.1)}#country-list{list-style:none;flex:1;overflow-y:auto;padding-right:.5rem;margin-right:-.5rem;max-height:calc(100vh - 200px)}#country-list::-webkit-scrollbar{width:6px}#country-list::-webkit-scrollbar-track{background:var(--background-light);border-radius:3px}#country-list::-webkit-scrollbar-thumb{background:var(--primary-color);border-radius:3px}#country-list li.continent-header{background:linear-gradient(135deg,var(--primary-color),var(--primary-dark));color:#fff;font-weight:700;font-size:1.2rem;text-align:center;padding:.8rem 1.2rem;border-radius:8px;margin-top:1rem;margin-bottom:.5rem;position:relative;cursor:pointer;transition:.3s;width:100%;margin-left:0}#country-list li.continent-header:hover{transform:translateX(0);opacity:.9}#country-list li.continent-header::after{content:'▼';position:absolute;right:1.2rem;transition:transform .3s}#country-list 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var(--shadow-color)}.content-area::-webkit-scrollbar{width:8px}.content-area::-webkit-scrollbar-track{background:var(--background-light)}.content-area::-webkit-scrollbar-thumb{background:var(--primary-color);border-radius:4px}.mode-container{width:100%}.mode-container.hidden{display:none!important}#game-mode{display:block;width:100%;height:100%;background-color:#fff}.country-header{position:relative;padding-top:.25rem;text-align:center;margin-bottom:1.5rem}.country-name{margin-bottom:1rem}.country-name h2{font-size:2.5rem;color:var(--primary-color);margin-bottom:.5rem}.country-name 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