:root{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;--bg-primary: #f1f5fa;--bg-secondary: #ffffff;--text-primary: #212529;--text-secondary: #6c757d;--text-link: #0d6efd;--border-color: #dee2e6;--card-shadow: 0 2px 12px rgba(0, 0, 0, .08);--button-primary-bg: #0d6efd;--button-primary-text: #ffffff;--button-primary-hover-bg: #0b5ed7;--button-secondary-bg: #6c757d;--button-secondary-text: #ffffff;--button-secondary-hover-bg: #5c636a;--input-bg: #ffffff;--input-border: #ced4da;--input-text: #495057;--header-bg: #2563eb;--header-text: #ffffff;--header-shadow: 0 2px 12px #e0e7ef;--header-slogan-text: #c7d6f7;--header-nav-text: #ffffff;--header-nav-admin-text: #c7d6f7;--header-nav-active-bg: #1e40af;--header-nav-admin-active-bg: #334155;--header-nav-hover-bg: #3b82f6;--header-nav-admin-hover-bg: #475569;--header-nav-active-shadow: 0 2px 8px #1e40af33;--header-user-text: #ffffff;--header-user-role-text: #c7d6f7;--theme-toggle-bg: #e2e8f0;--theme-toggle-text: #333;--quiz-item-bg: #f8f9fa;--quiz-item-hover-bg: #e9ecef;--quiz-answer-bg: #fafbff;--quiz-answer-selected-bg: #e6f0ff;--quiz-answer-border: #eee;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@keyframes cardEnterAnimation{0%{opacity:0;transform:translateY(20px) scale(.98)}to{opacity:1;transform:translateY(0) scale(1)}}body{margin:0;background-color:var(--bg-primary);color:var(--text-primary);transition:background-color .3s ease,color .3s ease;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;line-height:1.5}*,*:before,*:after{box-sizing:border-box}body.dark{--bg-primary: #1a202c;--bg-secondary: #2d3748;--text-primary: #e2e8f0;--text-secondary: #a0aec0;--text-link: #63b3ed;--border-color: #4a5568;--card-shadow: 0 2px 12px rgba(0, 0, 0, .4);--button-primary-bg: #3182ce;--button-primary-hover-bg: #2b6cb0;--button-secondary-bg: #718096;--button-secondary-hover-bg: #a0aec0;--input-bg: #4a5568;--input-border: #718096;--input-text: #e2e8f0;--header-bg: #1a202c;--header-text: #e2e8f0;--header-shadow: 0 2px 12px rgba(0, 0, 0, .5);--header-slogan-text: #a0aec0;--header-nav-text: #e2e8f0;--header-nav-admin-text: #a0aec0;--header-nav-active-bg: #4a5568;--header-nav-admin-active-bg: #718096;--header-nav-hover-bg: #4a5568;--header-nav-admin-hover-bg: #718096;--header-nav-active-shadow: 0 2px 8px rgba(0, 0, 0, .4);--header-user-text: #e2e8f0;--header-user-role-text: #a0aec0;--theme-toggle-bg: #4a5568;--theme-toggle-text: #e2e8f0;--quiz-item-bg: #4a5568;--quiz-item-hover-bg: #718096;--quiz-answer-bg: #3a475a;--quiz-answer-selected-bg: #4299e1;--quiz-answer-border: #4a5568}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:var(--button-primary-bg);color:var(--button-primary-text);cursor:pointer;transition:border-color .25s,background-color .25s}button:hover{background-color:var(--button-primary-hover-bg)}@keyframes fadeInTopCenterNotification{0%{opacity:0;transform:translate(-50%,-20px) scale(.95)}to{opacity:1;transform:translate(-50%) scale(1)}}.notification-top-center{position:fixed;top:20px;left:50%;transform:translate(-50%,-20px);background-color:#e53e3ee6;color:#fff;padding:15px 25px;border-radius:8px;box-shadow:0 5px 15px #0003;z-index:1100;text-align:center;opacity:0;animation:fadeInTopCenterNotification .3s ease-out forwards;transition:opacity .3s ease-out,transform .3s ease-out;pointer-events:none}.app-header{background:var(--header-bg);color:var(--header-text);box-shadow:var(--header-shadow);position:sticky;top:0;z-index:10}.header-container{max-width:1200px;margin:0 auto;display:flex;align-items:center;height:72px;gap:32px;padding:0 16px;justify-content:space-between}.header-logo-container{display:flex;align-items:center}.header-logo-link{text-decoration:none;color:inherit;display:flex;align-items:center}.header-logo-image{height:40px}.header-slogan{color:#fff;font-size:22px;margin-left:16px;font-weight:700;letter-spacing:.5px;min-width:120px}.header-hamburger{display:none;background:none;border:none;color:var(--header-text);font-size:32px;cursor:pointer;margin-left:auto}.header-nav{display:flex;gap:4px;align-items:center;margin-left:auto}.header-nav-link{padding:8px;border-radius:6px;color:var(--header-nav-text);background:transparent;font-weight:500;border:none;text-decoration:none;margin-left:0;transition:.2s;font-size:16px;box-shadow:none;outline:none;cursor:pointer;position:relative;top:0}.header-nav-link.admin{color:var(--header-nav-admin-text);font-size:14px}.header-nav-link.active{font-weight:700;background:var(--header-nav-active-bg);box-shadow:var(--header-nav-active-shadow)}.header-nav-link.admin.active{background:var(--header-nav-admin-active-bg)}.header-nav-link:hover{background:var(--header-nav-hover-bg)}.header-nav-link.admin:hover{background:var(--header-nav-admin-hover-bg)}.header-nav-link.active:hover{background:var(--header-nav-active-bg)}.header-nav-link.admin.active:hover{background:var(--header-nav-admin-active-bg)}.theme-toggle-button{padding:5px 10px;border-radius:6px;cursor:pointer;background:var(--theme-toggle-bg);color:var(--theme-toggle-text);border:none;font-size:14px;margin-left:10px}.user-info-span{margin-left:10px;color:var(--header-user-text);font-weight:700;font-size:15px;display:inline-flex;align-items:center}.user-role-span{color:var(--header-user-role-text);font-weight:400}.logout-button{margin-left:12px;background:none;border:none;color:inherit;cursor:pointer;font-weight:700;font-size:15px;padding:0}