@tailwind base;@tailwind components;@tailwind utilities;@layer base{:root{--background:0 0% 100%;--foreground:0 0% 3.9%;--card:0 0% 100%;--card-foreground:0 0% 3.9%;--popover:0 0% 100%;--popover-foreground:0 0% 3.9%;--primary:0 0% 9%;--primary-foreground:0 0% 98%;--secondary:0 0% 96.1%;--secondary-foreground:0 0% 9%;--muted:0 0% 96.1%;--muted-foreground:0 0% 45.1%;--accent:0 0% 96.1%;--accent-foreground:0 0% 9%;--destructive:0 84.2% 60.2%;--destructive-foreground:0 0% 98%;--border:0 0% 89.8%;--input:0 0% 89.8%;--ring:0 0% 3.9%;--radius:.5rem}.dark{--background:0 0% 3.9%;--foreground:0 0% 98%;--card:0 0% 3.9%;--card-foreground:0 0% 98%;--popover:0 0% 3.9%;--popover-foreground:0 0% 98%;--primary:0 0% 98%;--primary-foreground:0 0% 9%;--secondary:0 0% 14.9%;--secondary-foreground:0 0% 98%;--muted:0 0% 14.9%;--muted-foreground:0 0% 63.9%;--accent:0 0% 14.9%;--accent-foreground:0 0% 98%;--destructive:0 62.8% 30.6%;--destructive-foreground:0 0% 98%;--border:0 0% 14.9%;--input:0 0% 14.9%;--ring:0 0% 83.1%}@apply border-border;@apply bg-background text-foreground;}:root{--blue-900:#0c447c;--blue-700:#185fa5;--blue-500:#378add;--blue-300:#85b7eb;--blue-100:#e6f1fb;--blue-50:#f0f6fc;--gray-900:#1a1f26;--gray-700:#3d4654;--gray-500:#6b7585;--gray-300:#a8b1be;--gray-100:#e8ecf1;--gray-50:#f8fafc;--green-bg:#f0faf5;--green-border:#9fe1cb;--green-text:#085041;--green-icon:#1d9e75;--red-bg:#fef2f2;--red-border:#fecaca;--red-text:#7f1d1d;--sidebar-width:240px;--tutor-width:280px}*{box-sizing:border-box;margin:0;padding:0}body{color:var(--gray-900);-webkit-font-smoothing:antialiased;background:#fff;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.app{height:100vh;display:flex;overflow:hidden}.sidebar{width:var(--sidebar-width);background:var(--gray-50);border-right:1px solid var(--gray-100);flex-direction:column;flex-shrink:0;transition:width .25s;display:flex;position:relative;overflow:hidden}.sidebar.collapsed{width:40px}.sidebar-toggle{width:24px;height:24px;color:var(--gray-500);cursor:pointer;z-index:2;background:0 0;border:none;border-radius:4px;justify-content:center;align-items:center;font-size:14px;display:flex;position:absolute;top:12px;right:8px}.sidebar-toggle:hover{background:var(--gray-100)}.sidebar-header{padding:20px 16px 4px}.brand-title{color:var(--blue-700);font-size:18px;font-weight:600;line-height:1.2}.brand-subtitle{color:var(--blue-500);font-size:12px;font-weight:500}.course-tabs{gap:4px;padding:8px 16px 0;display:flex}.course-tab{border:1px solid var(--gray-100);color:var(--gray-500);cursor:pointer;text-align:center;background:#fff;border-radius:6px;flex:1;padding:6px 8px;font-size:11px;font-weight:600;transition:all .15s}.course-tab:hover{background:var(--blue-50);color:var(--blue-700)}.course-tab.active{background:var(--blue-700);color:#fff;border-color:var(--blue-700)}.course-label{color:var(--gray-500);text-transform:uppercase;letter-spacing:.5px;padding:8px 16px 6px;font-size:10px;font-weight:600}.sidebar-nav{flex:1;padding:0 8px 12px;overflow-y:auto}.module-group{margin-bottom:2px}.module-item{color:var(--gray-700);cursor:pointer;border-radius:6px;padding:7px 10px;font-size:12px;font-weight:500;transition:background .15s}.module-item:hover{background:var(--gray-100)}.module-item.active{background:var(--blue-100);color:var(--blue-900)}.module-number{color:var(--gray-500);margin-right:2px}.lesson-item{color:var(--gray-500);cursor:pointer;border-radius:4px;align-items:center;gap:4px;padding:5px 10px 5px 24px;font-size:11px;transition:all .15s;display:flex}.lesson-item:hover{background:var(--gray-100);color:var(--gray-700)}.lesson-item.active{background:var(--blue-50);color:var(--blue-700);font-weight:500}.lesson-item.completed{color:var(--green-icon)}.lesson-item .check{color:var(--green-icon);flex-shrink:0;font-size:10px}.sidebar-progress{border-top:1px solid var(--gray-100);padding:12px 16px}.progress-header{color:var(--gray-500);justify-content:space-between;margin-bottom:6px;font-size:11px;display:flex}.progress-bar{background:var(--gray-100);border-radius:2px;height:4px;overflow:hidden}.progress-fill{background:var(--blue-500);border-radius:2px;height:100%;transition:width .5s}.main-content{flex:1;max-width:820px;padding:32px 48px;position:relative;overflow-y:auto}.lesson-topbar{justify-content:space-between;align-items:center;margin-bottom:6px;display:flex}.lesson-breadcrumb{color:var(--blue-700);text-transform:uppercase;letter-spacing:.5px;font-size:11px;font-weight:600}.lesson-actions{gap:6px;display:flex}.icon-btn{border:1px solid var(--gray-100);width:28px;height:28px;color:var(--gray-500);cursor:pointer;background:#fff;border-radius:6px;justify-content:center;align-items:center;font-size:13px;transition:all .15s;display:flex}.icon-btn:hover,.icon-btn.active{background:var(--blue-100);color:var(--blue-700);border-color:var(--blue-300)}.icon-btn.bookmarked{color:var(--blue-500)}.lesson-title{color:var(--gray-900);margin-bottom:4px;font-size:24px;font-weight:600;line-height:1.3}.lesson-subtitle{color:var(--gray-500);margin-bottom:20px;font-size:14px}.pass-tabs{gap:6px;margin-bottom:24px;display:flex}.pass-tab{background:var(--gray-50);text-align:center;cursor:pointer;border:1px solid #0000;border-radius:10px;flex-direction:column;flex:1;align-items:center;gap:2px;padding:10px 12px;transition:all .2s;display:flex}.pass-tab:hover{background:var(--blue-50)}.pass-tab.active{background:var(--blue-100);border-color:var(--blue-300)}.pass-tab.completed{opacity:.7}.pass-tab.completed.active{opacity:1}.pass-icon{font-size:16px}.pass-label{color:var(--gray-700);font-size:11px;font-weight:500}.pass-tab.active .pass-label{color:var(--blue-900)}.pass-title{color:var(--gray-900);margin-bottom:16px;font-size:18px;font-weight:600}.pass-paragraph{color:var(--gray-700);margin-bottom:14px;font-size:14px;line-height:1.75}.pass-paragraph strong{color:var(--blue-700)}.diagram-container{background:var(--gray-50);border:1px solid var(--gray-100);border-radius:12px;margin:20px 0;padding:18px}.diagram-label{color:var(--blue-700);text-transform:uppercase;letter-spacing:.5px;margin-bottom:14px;font-size:10px;font-weight:600}.diagram-nodes{flex-wrap:wrap;justify-content:center;align-items:center;gap:4px;display:flex}.diagram-step{align-items:center;gap:4px;display:flex}.diagram-node{background:var(--blue-100);border:2px solid var(--blue-300);width:72px;height:72px;color:var(--blue-900);opacity:0;border-radius:50%;justify-content:center;align-items:center;font-size:11px;font-weight:600;transition:all .4s cubic-bezier(.34,1.56,.64,1);display:flex;transform:scale(.7)}.diagram-node.visible{opacity:1;transform:scale(1)}.diagram-node.tech{background:var(--blue-50);border-color:var(--blue-500)}.diagram-node.applied{background:var(--blue-700);border-color:var(--blue-700);color:#fff}.diagram-arrow{color:var(--blue-300);opacity:0;font-size:18px;transition:opacity .3s .2s}.diagram-arrow.visible{opacity:1}.examples-section{margin-top:24px}.section-heading{color:var(--gray-900);margin-bottom:10px;font-size:13px;font-weight:600}.example-card{background:var(--gray-50);border-radius:8px;align-items:flex-start;gap:10px;margin-bottom:8px;padding:14px 16px;display:flex}.example-number{background:var(--blue-100);width:22px;height:22px;color:var(--blue-700);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;margin-top:1px;font-size:11px;font-weight:600;display:flex}.example-card p{color:var(--gray-700);margin:0;font-size:13px;line-height:1.6}.glossary-panel{border-top:1px solid var(--gray-100);margin-top:20px;padding-top:16px}.glossary-item{background:var(--gray-50);border-radius:6px;align-items:baseline;gap:10px;margin-bottom:4px;padding:8px 10px;display:flex}.glossary-term{color:var(--blue-700);white-space:nowrap;flex-shrink:0;font-size:12px;font-weight:600}.glossary-def{color:var(--gray-500);font-size:12px;line-height:1.5}.exercise-heading{color:var(--gray-900);margin:8px 0 4px;font-size:20px;font-weight:600}.exercise-intro{color:var(--gray-500);margin-bottom:24px;font-size:13px}.exercise-card{background:var(--gray-50);border:1px solid var(--gray-100);border-radius:12px;margin-bottom:16px;padding:20px;transition:border-color .2s}.exercise-card.filled{border-color:var(--green-border);background:linear-gradient(to bottom, var(--green-bg), var(--gray-50))}.exercise-label{color:var(--blue-700);text-transform:uppercase;letter-spacing:.5px;margin-bottom:8px;font-size:10px;font-weight:700}.exercise-prompt{color:var(--gray-900);margin-bottom:10px;font-size:14px;font-weight:500;line-height:1.6}.hint-toggle{color:var(--blue-500);cursor:pointer;background:0 0;border:none;margin-bottom:6px;padding:4px 0;font-family:inherit;font-size:12px}.hint-toggle:hover{color:var(--blue-700)}.exercise-hint{color:var(--gray-500);background:var(--blue-50);border-radius:6px;margin-bottom:10px;padding:8px 12px;font-size:12px;font-style:italic;line-height:1.6}.exercise-textarea{border:1px solid var(--gray-100);width:100%;color:var(--gray-700);resize:vertical;background:#fff;border-radius:8px;padding:12px 14px;font-family:inherit;font-size:13px;line-height:1.6;transition:border-color .15s}.exercise-textarea:focus{border-color:var(--blue-300);outline:none;box-shadow:0 0 0 3px #378add1a}.exercise-saved{color:var(--green-icon);margin-top:6px;font-size:11px;font-weight:500}.review-title{color:var(--gray-900);margin:8px 0 4px;font-size:20px;font-weight:600}.review-intro{color:var(--gray-500);margin-bottom:20px;font-size:13px}.review-card{background:var(--gray-50);border-radius:10px;margin-bottom:12px;padding:16px}.review-question{color:var(--gray-900);margin-bottom:10px;font-size:13px;font-weight:500;line-height:1.5}.review-textarea{border:1px solid var(--gray-100);width:100%;color:var(--gray-700);resize:vertical;background:#fff;border-radius:8px;padding:10px 12px;font-family:inherit;font-size:13px;transition:border-color .15s}.review-textarea:focus{border-color:var(--blue-300);outline:none}.complete-view{text-align:center;flex-direction:column;justify-content:center;align-items:center;min-height:60vh;display:flex}.complete-icon{background:var(--blue-100);border:2px solid var(--blue-500);width:64px;height:64px;color:var(--blue-700);border-radius:50%;justify-content:center;align-items:center;margin-bottom:16px;font-size:28px;display:flex}.complete-icon.course{background:var(--blue-700);color:#fff;border-color:var(--blue-700);font-size:32px}.complete-title{color:var(--gray-900);font-size:22px;font-weight:600}.complete-subtitle{color:var(--gray-500);margin-bottom:24px;font-size:14px}.complete-stats{gap:12px;margin-bottom:28px;display:flex}.stat-card{background:var(--gray-50);text-align:center;border-radius:10px;padding:14px 22px}.stat-value{color:var(--blue-700);font-size:22px;font-weight:600}.stat-label{color:var(--gray-500);font-size:11px}.next-course-card{background:var(--blue-50);border:1px solid var(--blue-100);text-align:center;border-radius:12px;max-width:400px;padding:24px}.next-course-card h3{color:var(--blue-900);margin-bottom:8px;font-size:16px}.next-course-card p{color:var(--gray-700);font-size:13px;line-height:1.5}.coming-soon{color:var(--blue-500);font-size:12px;font-weight:600;margin-top:8px!important}.btn-primary{background:var(--blue-700);color:#fff;cursor:pointer;border:none;border-radius:8px;padding:10px 24px;font-size:13px;font-weight:500;transition:background .15s}.btn-primary:hover{background:var(--blue-900)}.btn-primary.lg{padding:12px 32px;font-size:14px}.btn-secondary{color:var(--gray-700);border:1px solid var(--gray-100);cursor:pointer;background:#fff;border-radius:8px;padding:10px 24px;font-size:13px;font-weight:500;transition:all .15s}.btn-secondary:hover{background:var(--gray-50);border-color:var(--gray-300)}.lesson-nav{border-top:1px solid var(--gray-100);align-items:center;gap:12px;margin-top:28px;padding-top:20px;display:flex}.tutor-panel{width:var(--tutor-width);background:var(--gray-50);border-left:1px solid var(--gray-100);z-index:10;flex-direction:column;display:flex;position:fixed;top:0;bottom:0;right:0;box-shadow:-4px 0 20px #0000000f}.tutor-header{border-bottom:1px solid var(--gray-100);justify-content:space-between;align-items:center;padding:14px 16px;display:flex}.tutor-title{color:var(--blue-700);font-size:13px;font-weight:600}.tutor-close{color:var(--gray-500);cursor:pointer;background:0 0;border:none;font-size:14px}.tutor-messages{flex-direction:column;flex:1;gap:8px;padding:12px;display:flex;overflow-y:auto}.tutor-msg{word-wrap:break-word;border-radius:10px;max-width:92%;padding:10px 12px;font-size:12px;line-height:1.6}.tutor-msg.assistant{border:1px solid var(--gray-100);color:var(--gray-700);background:#fff;border-radius:10px 10px 10px 2px;align-self:flex-start}.tutor-msg.user{background:var(--blue-100);color:var(--blue-900);border-radius:10px 10px 2px;align-self:flex-end}.tutor-input-row{border-top:1px solid var(--gray-100);gap:6px;padding:10px 12px;display:flex}.tutor-input{border:1px solid var(--gray-100);color:var(--gray-700);border-radius:8px;flex:1;padding:8px 12px;font-family:inherit;font-size:12px}.tutor-input:focus{border-color:var(--blue-300);outline:none}.tutor-send{background:var(--blue-700);color:#fff;cursor:pointer;border:none;border-radius:8px;padding:8px 14px;font-size:14px}.tutor-send:hover{background:var(--blue-900)}.tutor-send:disabled{opacity:.5;cursor:default}.fade-in{animation:.35s fadeIn}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@media (width<=768px){.sidebar{z-index:20;height:100vh;position:fixed}.sidebar.collapsed{width:40px}.main-content{max-width:100%;padding:20px}.lesson-title{font-size:20px}.pass-tabs{flex-direction:column;gap:4px}.pass-tab{flex-direction:row;justify-content:center}.tutor-panel{width:100%}.diagram-nodes{gap:2px}.diagram-node{width:56px;height:56px;font-size:9px}.complete-stats{flex-direction:column;gap:8px}}.onboarding-screen{background:linear-gradient(165deg,#0f1923 0%,#2d3a47 60%,#0c447c 100%);justify-content:center;align-items:center;min-height:100vh;padding:24px;display:flex}.onboarding-card{background:#fff;border-radius:16px;width:100%;max-width:640px;padding:48px 40px;box-shadow:0 24px 80px #0000004d}.onboarding-brand{letter-spacing:3px;text-transform:uppercase;color:var(--accent);margin-bottom:8px;font-size:13px;font-weight:600}.onboarding-title{font-family:var(--font-heading);color:var(--ink);margin-bottom:8px;font-size:28px}.onboarding-sub{color:var(--steel);margin-bottom:32px;font-size:15px}.onboarding-field{margin-bottom:24px}.onboarding-field label{color:var(--ink);margin-bottom:8px;font-size:14px;font-weight:600;display:block}.onboarding-options{flex-wrap:wrap;gap:8px;display:flex}.onboarding-options.wrap{flex-wrap:wrap}.onboarding-option{border:1px solid var(--border);background:var(--snow);color:var(--steel);cursor:pointer;border-radius:8px;padding:8px 16px;font-size:13px;transition:all .15s}.onboarding-option:hover{border-color:var(--accent);color:var(--accent)}.onboarding-option.selected{background:var(--accent);color:#fff;border-color:var(--accent)}.onboarding-textarea{border:1px solid var(--border);resize:vertical;border-radius:8px;width:100%;min-height:60px;padding:12px;font-family:inherit;font-size:14px}.onboarding-textarea:focus{border-color:var(--accent);outline:none}.onboarding-char-count{color:var(--silver);text-align:right;margin-top:4px;font-size:11px}.onboarding-start{width:100%;margin-top:8px}.onboarding-start:disabled{opacity:.4;cursor:not-allowed}.onboarding-hint{color:var(--silver);text-align:center;margin-top:8px;font-size:13px}.tutor-welcome{padding:16px}.tutor-welcome-text{color:var(--steel);margin-bottom:12px;font-size:13px}.tutor-prewritten{flex-direction:column;gap:6px;display:flex}.tutor-prewritten-btn{border:1px solid var(--border);background:var(--snow);color:var(--ink);cursor:pointer;text-align:left;border-radius:8px;padding:10px 14px;font-size:13px;line-height:1.4;transition:all .15s}.tutor-prewritten-btn:hover{border-color:var(--accent);background:var(--accent-light);color:var(--accent)}.tutor-limit-notice{color:var(--silver);text-align:center;border-top:1px solid var(--border);background:var(--snow);padding:8px 16px;font-size:12px}.las-subtle{background:var(--snow);border:1px solid var(--border);border-radius:8px;margin-top:32px;padding:16px 20px}.las-subtle-text{color:var(--silver);font-size:13px;line-height:1.6}.las-subtle a{color:var(--steel);text-underline-offset:2px;text-decoration:underline}.las-subtle a:hover{color:var(--accent)}.onboarding-legal{border-top:1px solid var(--border);color:var(--silver);text-align:center;margin-top:24px;padding-top:16px;font-size:11px;line-height:1.6}.onboarding-legal a{color:var(--steel);text-underline-offset:2px;text-decoration:underline}.onboarding-legal a:hover{color:var(--accent)}.completion-continuing{background:var(--snow);border:1px solid var(--border);text-align:left;border-radius:12px;margin-top:24px;padding:24px}.completion-continuing h4{font-family:var(--font-heading);color:var(--ink);margin-bottom:12px;font-size:18px}.completion-next-item{color:var(--steel);margin-bottom:10px;font-size:14px;line-height:1.6}.completion-next-item:last-child{margin-bottom:0}.auth-field{margin-bottom:16px}.auth-field label{color:var(--ink);margin-bottom:6px;font-size:13px;font-weight:600;display:block}.auth-field input{border:1px solid var(--border);border-radius:8px;width:100%;padding:10px 12px;font-family:inherit;font-size:14px}.auth-field input:focus{border-color:var(--accent);outline:none}.auth-error{color:#c0392b;background:#fdf0ed;border-radius:6px;margin-bottom:12px;padding:8px 12px;font-size:13px}.auth-message{color:#27ae60;background:#edf7ed;border-radius:6px;margin-bottom:12px;padding:8px 12px;font-size:13px}.auth-link{color:var(--accent);cursor:pointer;text-align:center;margin-top:12px;font-size:13px}.auth-link:hover{text-decoration:underline}.sidebar-user{border-top:1px solid var(--border);justify-content:space-between;align-items:center;gap:8px;padding:12px 16px;display:flex}.sidebar-email{color:var(--silver);text-overflow:ellipsis;white-space:nowrap;font-size:11px;overflow:hidden}.sidebar-logout{color:var(--silver);border:1px solid var(--border);cursor:pointer;background:0 0;border-radius:4px;flex-shrink:0;padding:3px 8px;font-size:11px}.sidebar-logout:hover{color:var(--accent);border-color:var(--accent)}.protected-content{-webkit-user-select:none;user-select:none}.protected-content .exercise-textarea,.protected-content .review-textarea,.protected-content .tutor-input,.protected-content .onboarding-textarea{-webkit-user-select:text;user-select:text}@media print{.protected-content{display:none!important}body:after{content:"Printing is not available for this content.";text-align:center;padding:40px;font-size:18px;display:block}}