@import "https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap";:root{--navy:#2e3b6c;--navy-light:#3d4e8a;--navy-dark:#1e2a52;--teal:#207670;--teal-light:#2a9a92;--gold:#e9cfb3;--gold-dark:#c4a67d;--bg:#f5f6fa;--surface:#fff;--text:#1a1a2e;--text-light:#6b7280;--text-muted:#9ca3af;--border:#e5e7eb;--border-light:#f3f4f6;--success:#10b981;--success-light:#d1fae5;--error:#ef4444;--error-light:#fee2e2;--info:#3b82f6;--info-light:#dbeafe;--radius-sm:6px;--radius-md:10px;--radius-lg:14px;--radius-xl:20px;--radius-full:9999px;--shadow-sm:0 1px 3px #0000000f, 0 1px 2px #0000000a;--shadow-md:0 4px 12px #00000014;--shadow-lg:0 10px 30px #0000001f;--sidebar-width:260px;--mobile-header-height:56px;--mobile-nav-height:60px}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;line-height:1.5}a{color:inherit;text-decoration:none}button{cursor:pointer;border:none;font-family:inherit}input,select{font-family:inherit}.app-shell{min-height:100vh;display:flex}.sidebar{width:var(--sidebar-width);background:var(--navy);color:#fff;z-index:200;flex-direction:column;display:flex;position:fixed;top:0;bottom:0;left:0}.sidebar-top-row{justify-content:space-between;align-items:flex-start;display:flex}.sidebar-close-btn{color:#fff9;border-radius:var(--radius-sm);background:0 0;margin:16px 12px 0 0;padding:8px;display:none}.sidebar-close-btn:hover{color:#fff}.sidebar-brand{border-bottom:1px solid #ffffff1a;flex:1;padding:28px 24px 20px}.sidebar-brand h1{letter-spacing:-.5px;font-size:20px;font-weight:800}.sidebar-brand span{color:var(--gold);letter-spacing:1px;text-transform:uppercase;font-size:12px;font-weight:600}.sidebar-nav{flex-direction:column;flex:1;gap:4px;padding:16px 12px;display:flex}.sidebar-link{border-radius:var(--radius-md);color:#ffffffb3;text-align:left;background:0 0;align-items:center;gap:12px;width:100%;padding:12px 16px;font-size:14px;font-weight:500;transition:all .15s;display:flex}.sidebar-link:hover{color:#fff;background:#ffffff14}.sidebar-link.active{color:#fff;background:#ffffff26;font-weight:600}.sidebar-footer{border-top:1px solid #ffffff1a;padding:16px}.sidebar-user{align-items:center;gap:12px;padding:8px;display:flex}.sidebar-avatar{background:var(--teal);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:36px;height:36px;font-size:13px;font-weight:700;display:flex}.sidebar-user-info{flex:1;min-width:0}.sidebar-user-name{white-space:nowrap;text-overflow:ellipsis;font-size:13px;font-weight:600;overflow:hidden}.sidebar-user-email{color:#ffffff80;white-space:nowrap;text-overflow:ellipsis;font-size:11px;overflow:hidden}.sidebar-overlay,.mobile-header{display:none}.mobile-menu-btn{color:var(--text);border-radius:var(--radius-sm);background:0 0;padding:8px}.mobile-header-brand{text-align:center;flex:1}.mobile-header-title{color:var(--navy);letter-spacing:-.3px;font-size:17px;font-weight:800}.mobile-header-avatar{background:var(--teal);color:#fff;cursor:pointer;border-radius:50%;justify-content:center;align-items:center;width:32px;height:32px;font-size:12px;font-weight:700;display:flex}.main-content{margin-left:var(--sidebar-width);flex:1;padding:40px 48px}.mobile-nav{display:none}.mobile-nav-item{color:var(--text-muted);background:0 0;flex-direction:column;flex:1;align-items:center;gap:2px;padding:6px 0;font-size:10px;font-weight:600;text-decoration:none;transition:color .15s;display:flex}.mobile-nav-item.active{color:var(--navy)}.page-header{margin-bottom:28px;animation:.3s pageSlideIn}@keyframes pageSlideIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.welcome-banner{background:linear-gradient(135deg, var(--navy) 0%, var(--navy-dark) 50%, #1a2340 100%);border-radius:var(--radius-lg);color:#fff;margin-bottom:28px;padding:28px 32px;position:relative;overflow:hidden}.welcome-banner:before{content:"";background:radial-gradient(circle,#2076704d 0%,#0000 70%);border-radius:50%;width:300px;height:300px;position:absolute;top:-40%;right:-20%}.welcome-banner h1{z-index:1;font-size:26px;font-weight:800;position:relative}.welcome-banner p{color:#fff9;z-index:1;margin-top:4px;position:relative}.page-title{color:var(--text);letter-spacing:-.5px;font-size:28px;font-weight:800}.page-subtitle{color:var(--text-light);margin-top:4px;font-size:15px}.card{background:var(--surface);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);border:1px solid #0000000a;padding:24px;transition:box-shadow .2s,transform .2s}.card-header{align-items:center;gap:10px;margin-bottom:16px;display:flex}.card-title{color:var(--text);font-size:16px;font-weight:700}.stats-grid{grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:28px;display:grid}.stat-card{-webkit-backdrop-filter:blur(12px);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);text-align:center;background:#ffffffb3;border:1px solid #fff9;padding:20px;transition:transform .2s,box-shadow .2s}.stat-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.stat-value{color:var(--text);font-size:28px;font-weight:800}.stat-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;margin-top:4px;font-size:12px;font-weight:600}.action-grid{grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:28px;display:grid}.action-card{background:var(--surface);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);cursor:pointer;text-align:center;padding:24px;transition:all .15s}.action-card:hover{transform:translateY(-3px);box-shadow:0 8px 24px #2e3b6c1f}.action-icon{border-radius:var(--radius-lg);justify-content:center;align-items:center;width:56px;height:56px;margin:0 auto 12px;display:flex}.action-title{color:var(--text);font-size:15px;font-weight:700}.action-subtitle{color:var(--text-muted);margin-top:2px;font-size:12px}.module-card{background:var(--surface);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);align-items:flex-start;gap:16px;padding:24px;transition:transform .15s,box-shadow .15s;display:flex}.module-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.module-icon{border-radius:var(--radius-md);width:48px;height:48px;color:var(--navy);background:#2e3b6c14;flex-shrink:0;justify-content:center;align-items:center;display:flex}.module-icon.locked{background:var(--border-light);color:var(--text-muted)}.module-info{flex:1;min-width:0}.module-title{color:var(--text);flex-wrap:wrap;align-items:center;gap:8px;font-size:16px;font-weight:700;display:flex}.module-description{color:var(--text-light);margin-top:4px;font-size:13px;line-height:1.5}.module-meta{color:var(--text-muted);margin-top:8px;font-size:12px;font-weight:600}.module-actions{flex-wrap:wrap;gap:8px;margin-top:12px;display:flex}.badge-free{border-radius:var(--radius-full);background:var(--success-light);color:var(--success);letter-spacing:.5px;padding:2px 8px;font-size:10px;font-weight:700;display:inline-flex}.btn{border-radius:var(--radius-md);white-space:nowrap;justify-content:center;align-items:center;gap:8px;padding:10px 20px;font-size:14px;font-weight:600;transition:all .15s;display:inline-flex}.btn-primary:hover{background:var(--teal-light)}.btn-secondary{color:var(--navy);background:#2e3b6c14;border:1px solid #2e3b6c26}.btn-secondary:hover{background:#2e3b6c1f}.btn-navy:hover{background:var(--navy-light)}.btn-danger{background:var(--error-light);color:var(--error);border:1px solid #ef444433}.btn-danger:hover{background:#fecaca}.btn-lg{border-radius:var(--radius-lg);padding:14px 28px;font-size:16px;font-weight:700}.quiz-progress-bar{background:var(--border-light);border-radius:2px;height:4px;margin-bottom:20px;overflow:hidden}.quiz-progress-fill{background:var(--teal);border-radius:2px;height:100%;transition:width .3s}.quiz-question{color:var(--text);margin-bottom:24px;font-size:20px;font-weight:600;line-height:1.5}.quiz-option{border-radius:var(--radius-md);border:2px solid var(--border);background:var(--surface);cursor:pointer;text-align:left;width:100%;color:var(--text);align-items:center;gap:14px;padding:16px;font-size:15px;transition:all .15s;display:flex}.quiz-option:hover:not(:disabled){border-color:var(--navy);background:#2e3b6c08}.quiz-option.selected{border-color:var(--navy);background:#2e3b6c0f;font-weight:500}.quiz-option.correct{border-color:var(--success);background:var(--success-light)}.quiz-option.incorrect{border-color:var(--error);background:var(--error-light)}.quiz-option.faded{opacity:.4}.quiz-option-bullet{border:2px solid var(--border);width:32px;height:32px;color:var(--text-muted);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:13px;font-weight:700;transition:all .15s;display:flex}.quiz-option.selected .quiz-option-bullet{background:var(--navy);border-color:var(--navy);color:#fff}.quiz-explanation{background:var(--info-light);border-radius:var(--radius-md);align-items:flex-start;gap:10px;padding:16px;animation:.3s slideUp;display:flex}.quiz-explanation p{color:#1e3a5f;font-size:14px;line-height:1.6}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.flashcard-container{perspective:1000px;width:100%;max-width:560px;margin:0 auto}.flashcard{aspect-ratio:3/2;cursor:pointer;width:100%;transform-style:preserve-3d;transition:transform .5s;position:relative}.flashcard.flipped{transform:rotateY(180deg)}.flashcard-face{backface-visibility:hidden;border-radius:var(--radius-xl);text-align:center;box-shadow:var(--shadow-md);flex-direction:column;justify-content:center;align-items:center;padding:40px;display:flex;position:absolute;inset:0}.flashcard-front{background:var(--surface);border:2px solid var(--border)}.flashcard-back{background:var(--navy);color:#fff;transform:rotateY(180deg)}.flashcard-label{letter-spacing:1.5px;text-transform:uppercase;opacity:.5;margin-bottom:16px;font-size:11px;font-weight:700}.flashcard-text{font-size:18px;font-weight:500;line-height:1.6}.timer-bar{background:var(--navy);border-radius:var(--radius-md);color:#fff;align-items:center;gap:10px;margin-bottom:20px;padding:10px 20px;display:flex}.timer-bar.low{background:var(--error-light);color:var(--error)}.timer-value{font-variant-numeric:tabular-nums;font-size:18px;font-weight:800}.auth-page{background:linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 40%, #1a3a5c 70%, var(--navy-dark) 100%);background-size:400% 400%;justify-content:center;align-items:center;min-height:100vh;padding:20px;animation:12s infinite authGradient;display:flex;position:relative;overflow:hidden}.auth-page:before,.auth-page:after{content:"";opacity:.15;border-radius:50%;position:absolute}.auth-page:before{background:radial-gradient(circle, var(--teal), transparent 70%);width:500px;height:500px;animation:8s ease-in-out infinite alternate authOrb1;top:-10%;right:-10%}.auth-page:after{background:radial-gradient(circle, var(--gold), transparent 70%);width:400px;height:400px;animation:10s ease-in-out infinite alternate authOrb2;bottom:-15%;left:-5%}@keyframes authGradient{0%,to{background-position:0%}50%{background-position:100%}}@keyframes authOrb1{0%{transform:translate(0)scale(1)}to{transform:translate(-40px,30px)scale(1.1)}}@keyframes authOrb2{0%{transform:translate(0)scale(1)}to{transform:translate(30px,-20px)scale(1.15)}}.auth-card{-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-radius:var(--radius-xl);z-index:1;background:#fffffff7;width:100%;max-width:420px;padding:40px;animation:.5s authCardIn;position:relative;box-shadow:0 20px 60px #0000004d}@keyframes authCardIn{0%{opacity:0;transform:translateY(20px)scale(.98)}to{opacity:1;transform:translateY(0)scale(1)}}.auth-brand{text-align:center;margin-bottom:32px}.auth-brand h1{color:var(--navy);letter-spacing:-.5px;font-size:26px;font-weight:800}.auth-brand p{color:var(--gold-dark);letter-spacing:1.5px;text-transform:uppercase;margin-top:4px;font-size:12px;font-weight:600}.form-input{border:2px solid var(--border);border-radius:var(--radius-md);width:100%;color:var(--text);background:var(--surface);outline:none;padding:12px 14px;font-size:15px;transition:border-color .15s}.form-input:focus{border-color:var(--navy)}.form-error{background:var(--error-light);color:var(--error);border-radius:var(--radius-md);margin-bottom:16px;padding:10px 14px;font-size:13px;font-weight:500}.auth-footer{text-align:center;color:var(--text-light);margin-top:20px;font-size:14px}.auth-footer a{color:var(--teal);font-weight:600}.auth-footer a:hover{text-decoration:underline}.mt-sm{margin-top:8px}@media (width<=1024px){.main-content{padding:24px}.page-title,.stat-value{font-size:24px}.action-grid{grid-template-columns:repeat(2,1fr)}}@media (width<=768px){.mobile-header{background:var(--surface);border-bottom:1px solid var(--border);z-index:100;height:var(--mobile-header-height);justify-content:space-between;align-items:center;padding:8px 16px;display:flex;position:fixed;top:0;left:0;right:0}.sidebar{width:280px;transition:transform .3s cubic-bezier(.4,0,.2,1);transform:translate(-100%)}.sidebar.open{transform:translate(0)}.sidebar-close-btn{display:block}.sidebar-overlay{z-index:150;background:#0006;animation:.2s fadeIn;display:block;position:fixed;inset:0}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.main-content{padding:16px;padding-top:calc(var(--mobile-header-height) + 16px);padding-bottom:calc(var(--mobile-nav-height) + 24px);max-width:100%;margin-left:0}.mobile-nav{background:var(--surface);border-top:1px solid var(--border);padding:4px 0 env(safe-area-inset-bottom,8px);z-index:100;height:var(--mobile-nav-height);justify-content:space-around;display:flex;position:fixed;bottom:0;left:0;right:0}.stats-grid{grid-template-columns:repeat(3,1fr);gap:8px}.stat-card{padding:14px 8px}.stat-value{font-size:22px}.stat-label{font-size:10px}.action-grid{grid-template-columns:repeat(2,1fr);gap:10px}.action-card{padding:16px 12px}.action-icon{width:44px;height:44px;margin-bottom:8px}.action-title{font-size:13px}.module-card{gap:12px;padding:16px}.module-icon{width:40px;height:40px}.module-title{font-size:15px}.quiz-question{font-size:17px}.quiz-option{gap:10px;padding:12px;font-size:14px}.quiz-option-bullet{width:28px;height:28px;font-size:12px}.flashcard-face{padding:24px}.flashcard-text{font-size:16px}.auth-card{padding:28px 20px}.form-row{grid-template-columns:1fr}.page-title{font-size:22px}.page-subtitle{font-size:14px}.card{padding:16px}.timer-bar{border-radius:var(--radius-sm);padding:8px 14px}.timer-value{font-size:16px}}@media (width<=380px){.stats-grid{grid-template-columns:1fr 1fr 1fr;gap:6px}.stat-value{font-size:18px}.stat-label{font-size:9px}.action-grid{grid-template-columns:1fr 1fr;gap:8px}.action-card{padding:12px 8px}.action-icon{width:36px;height:36px}.action-title{font-size:12px}.action-subtitle{font-size:10px}.mobile-nav-item{font-size:9px}.mobile-nav-item svg{width:18px;height:18px}.quiz-question{font-size:15px}}.admin-sidebar .sidebar-brand span{color:#fff6;font-size:11px}.modal-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:1000;background:#00000080;justify-content:center;align-items:center;padding:20px;animation:.15s fadeIn;display:flex;position:fixed;inset:0}.modal-card{background:var(--surface);border-radius:var(--radius-lg);width:100%;max-height:90vh;box-shadow:var(--shadow-lg);padding:24px;animation:.2s slideUp;overflow-y:auto}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.form-group{margin-bottom:14px}.form-label{color:var(--text-light);margin-bottom:5px;font-size:13px;font-weight:600;display:block}.form-input{border:1.5px solid var(--border);border-radius:var(--radius-md);background:var(--surface);width:100%;color:var(--text);padding:10px 14px;font-family:inherit;font-size:14px;transition:border-color .15s,box-shadow .15s}.form-input:focus{border-color:var(--navy);outline:none;box-shadow:0 0 0 3px #2e3b6c1a}.form-input::placeholder{color:var(--text-muted)}textarea.form-input{line-height:1.5}select.form-input{cursor:pointer;appearance:auto}.form-row{grid-template-columns:1fr 1fr;gap:12px;display:grid}.btn{border-radius:var(--radius-md);cursor:pointer;white-space:nowrap;border:none;align-items:center;gap:6px;padding:10px 18px;font-family:inherit;font-size:14px;font-weight:600;transition:all .15s;display:inline-flex}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--teal);color:#fff}.btn-primary:hover:not(:disabled){background:var(--teal-light)}.btn-navy{background:var(--navy);color:#fff}.btn-navy:hover:not(:disabled){background:var(--navy-light)}.btn-secondary{background:var(--border-light);color:var(--text)}.btn-secondary:hover:not(:disabled){background:var(--border)}.btn-danger{background:var(--error);color:#fff}.btn-danger:hover:not(:disabled){background:#dc2626}.btn-sm{padding:6px 12px;font-size:12px}.btn-lg{padding:14px 24px;font-size:15px}.flex-gap{flex-direction:column;gap:10px;display:flex}.text-center{text-align:center}.mt-md{margin-top:32px}.mb-md{margin-bottom:16px}