@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes shine{0%{transform:translateX(-100%)}to{transform:translateX(100%)}}*{margin:0;padding:0;box-sizing:border-box;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}body{position:relative;background-color:#0a0f1c;color:#e2e8f0;line-height:1.6;height:100vh;overflow:hidden}body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;background-image:linear-gradient(rgba(0,255,209,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(0,255,209,.05) 1px,transparent 1px);background-size:30px 30px}.container{display:flex;height:100vh}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:rgba(255,255,255,.05)}::-webkit-scrollbar-thumb{background:linear-gradient(180deg,#00ffd1,#00c6ff);border-radius:3px}.nav-btn{padding:8px 16px;border-radius:6px;font-size:14px;font-weight:500;border:0;cursor:pointer;transition:all .3s ease;position:relative;overflow:hidden}.nav-btn::before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.2),transparent);transition:.5s}.nav-btn:hover::before{left:100%}.nav-btn:hover{transform:translateY(-2px);box-shadow:0 5px 15px rgba(0,0,0,.3)}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.8);backdrop-filter:blur(5px);display:none;justify-content:center;align-items:center;z-index:1000}.modal-content{background:rgba(10,14,22,.96);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-radius:12px;width:90%;max-width:600px;max-height:80vh;overflow-y:auto;padding:30px;position:relative;border:1px solid rgba(0,255,209,.22);box-shadow:0 0 50px rgba(0,255,209,.12),0 20px 48px rgba(0,0,0,.55)}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;padding-bottom:15px;border-bottom:1px solid rgba(0,255,209,.18)}.modal-title{font-size:20px;font-weight:600;background:linear-gradient(90deg,#00ffd1,#00c6ff);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.close-modal{background:0 0;border:0;font-size:24px;cursor:pointer;color:rgba(224,224,224,.7);transition:color .3s}.close-modal:hover{color:#00ffd1}.modal-body{margin-bottom:20px}.modal-footer{text-align:right;padding-top:20px;border-top:1px solid rgba(255,255,255,.1)}.modal-btn{padding:10px 30px;background:linear-gradient(90deg,#00ffd1,#00c6ff);color:#0a0f1c;border:0;border-radius:8px;cursor:pointer;font-weight:600;transition:all .3s}.modal-btn:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,255,209,.25)}.level-complete-buttons{display:flex;justify-content:center;gap:20px;margin-top:30px}.level-complete-btn{padding:12px 35px;border:0;border-radius:8px;font-size:16px;font-weight:600;cursor:pointer;transition:all .3s ease;min-width:180px}.level-complete-btn:hover{transform:translateY(-3px);box-shadow:0 8px 20px rgba(0,0,0,.3)}.btn-back{background:linear-gradient(135deg,#3498db,#2980b9);color:#fff}.btn-next{background:linear-gradient(135deg,#2ecc71,#27ae60);color:#fff}