.app-container{padding:70px 0 100px;margin:0 auto;width:80%;max-width:700px;text-align:center}.header{position:fixed;width:100%;height:70px;background:linear-gradient(135deg,#244d76,#3a6ea5,#1b2f4a);color:#fff;box-shadow:0 2px 4px #0003;transition:box-shadow .3s ease;display:flex;justify-content:space-between;align-items:center;z-index:1000}.header.scrolled{box-shadow:0 6px 16px #00000059;background:linear-gradient(135deg,#1e3f63,#2f5f91,#16263c)}.logo{text-decoration:none;color:#fff;background-color:inherit;border:none;font-size:2rem;font-weight:700;padding-left:16px;letter-spacing:.1rem;cursor:pointer;transition:all ease .15s}.logo:hover{transform:translateY(-1px)}.icons-container{display:flex;gap:16px;margin-right:15px}@media(max-width:768px){.header{height:60px}.logo{font-size:1.5rem;padding-left:12px;letter-spacing:.05rem}}@media(max-width:480px){.logo{font-size:1.3rem}}.header-button{background-color:inherit;border:none;cursor:pointer;transform:scale(.9);transition:all ease 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#e0e0e0;width:100%;max-height:60px}.footer-content{display:flex;flex-direction:column;align-items:center}.footer-links{display:flex;gap:20px}.footer-links a{text-decoration:none;color:#666;font-size:14px;transition:color .2s;cursor:pointer}.footer-links a:hover{color:#1976d2}.copyright{margin:5px;font-size:12px;color:#999}.quiz-loading{display:flex;flex-direction:column;justify-content:center;min-height:60vh;text-align:center;gap:20px}.quiz-loading-button-container{display:flex;gap:12px;justify-content:center}.quiz-loading p{color:#e53e3e;font-weight:600;line-height:1.6;max-width:400px;margin-left:auto;margin-right:auto}.error-icon{color:red;transform:scale(2)}.loader-container{position:fixed;top:0;left:0;width:100vw;height:100vh;display:flex;align-items:center;justify-content:center;background-color:#fff9;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:9999}.loader{width:100px;height:100px;border-radius:50%;background:conic-gradient(from 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