:root{--bg:#f5f7fa;--surface:#fff;--surface-2:#f8fafc;--text:#172033;--muted:#667085;--line:#dfe5ec;--accent:#3157d5;--accent-2:#2547b8;--danger:#b42318;--success:#067647;--warning:#b54708;--sidebar:240px;--radius:12px;--shadow:0 8px 28px rgba(16,24,40,.06)}
*{box-sizing:border-box}html{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text);line-height:1.5}body{margin:0;background:var(--bg);color:var(--text);max-width:100%;overflow-x:hidden}a{color:var(--accent);text-decoration:none}button,input,select,textarea{font:inherit;color:inherit}button,a,input,select,textarea{outline-offset:2px}:focus-visible{outline:3px solid rgba(49,87,213,.28)}.app-shell{min-height:100vh;padding-left:var(--sidebar)}.sidebar{position:fixed;inset:0 auto 0 0;width:var(--sidebar);background:#101828;color:#d0d5dd;padding:22px 14px;display:flex;flex-direction:column;z-index:30}.brand{display:flex;gap:11px;align-items:center;color:#fff;padding:5px 8px 22px}.brand-mark{width:38px;height:38px;border-radius:10px;background:#fff;color:#101828;display:grid;place-items:center;font-weight:800}.brand span:last-child{display:flex;flex-direction:column}.brand small{color:#98a2b3}.sidebar nav{display:grid;gap:4px}.nav-link{display:block;padding:10px 12px;border-radius:9px;color:#cbd5e1;font-weight:600}.nav-link:hover,.nav-link.active{background:#1d2939;color:#fff}.logout-form{margin-top:auto}.button-link{width:100%;border:0;background:transparent;text-align:left;cursor:pointer}.topbar{height:72px;background:rgba(255,255,255,.94);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 28px;position:sticky;top:0;z-index:20;backdrop-filter:blur(8px)}.topbar>div:first-of-type{display:flex;gap:10px;align-items:baseline}.eyebrow{text-transform:uppercase;letter-spacing:.08em;font-size:11px;color:var(--muted);font-weight:800}.user-chip{display:flex;flex-direction:column;align-items:flex-end}.user-chip small{color:var(--muted)}.main-content{padding:28px;max-width:1340px;margin:0 auto 80px}.page-head{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;margin-bottom:22px}.page-head h1{margin:0 0 5px;font-size:28px;line-height:1.15}.page-head p{margin:0;color:var(--muted)}.grid{display:grid;gap:16px}.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}.grid.four{grid-template-columns:repeat(4,minmax(0,1fr))}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}.card h2,.card h3{margin-top:0}.metric{display:flex;flex-direction:column;gap:4px}.metric strong{font-size:26px}.metric small,.muted{color:var(--muted)}.progress-track{height:8px;background:#e9edf3;border-radius:99px;overflow:hidden}.progress-bar{height:100%;background:var(--accent);border-radius:inherit}.status{display:inline-flex;align-items:center;gap:5px;font-size:12px;font-weight:750;border-radius:999px;padding:4px 8px;background:#eef2f6;color:#475467}.status.passed,.status.completed{background:#ecfdf3;color:#067647}.status.needs_work,.status.remediation,.status.overdue{background:#fff4ed;color:#b54708}.status.locked{background:#f2f4f7;color:#667085}.status.in_progress,.status.available,.status.not_started,.status.due{background:#eef4ff;color:#3538cd}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:42px;border-radius:9px;border:1px solid var(--line);padding:9px 14px;background:#fff;font-weight:700;cursor:pointer;gap:8px}.btn:hover{background:#f8fafc}.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn.primary:hover{background:var(--accent-2)}.btn.danger{border-color:#fecdca;color:var(--danger);background:#fff}.btn.small{min-height:34px;padding:6px 10px;font-size:13px}.btn:disabled{opacity:.5;cursor:not-allowed}.icon-btn{border:1px solid var(--line);background:#fff;border-radius:8px;width:38px;height:38px;cursor:pointer}.notice{padding:12px 14px;border:1px solid #b2ccff;background:#eff4ff;border-radius:9px;margin:12px 0;color:#344054}.notice.success{border-color:#abefc6;background:#ecfdf3;color:#05603a}.notice.danger{border-color:#fecdca;background:#fef3f2;color:#912018}.notice.warning{border-color:#fedf89;background:#fffaeb;color:#93370d}.session-list{display:grid;gap:12px}.session-card{display:grid;grid-template-columns:64px 1fr auto;gap:15px;align-items:center;padding:16px;border:1px solid var(--line);border-radius:10px;background:var(--surface)}.session-index{font-size:12px;color:var(--muted);font-weight:800;text-transform:uppercase}.session-card h3{margin:0 0 4px;font-size:17px}.session-card p{margin:3px 0;color:var(--muted);font-size:14px}.pill-row{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}.lesson-shell{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:20px;align-items:start}.lesson-main{display:grid;gap:14px}.lesson-section{background:#fff;border:1px solid var(--line);border-radius:11px;padding:20px}.lesson-section h2{font-size:18px;margin:0 0 12px}.lesson-section p{white-space:pre-line}.lesson-aside{position:sticky;top:92px;display:grid;gap:12px}.step-list{display:grid;gap:10px}.step{display:grid;grid-template-columns:52px 1fr;gap:12px;padding:12px;background:var(--surface-2);border-radius:9px}.step-time{font-weight:800;color:var(--accent)}.example.good{border-left:4px solid #12b76a}.example.bad{border-left:4px solid #f04438}.example{padding:12px 14px;background:var(--surface-2);margin:8px 0;border-radius:8px}.answer-area{width:100%;min-height:260px;resize:vertical;border:1px solid var(--line);border-radius:10px;padding:14px;background:#fff}.answer-toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:10px 0}.action-row{display:flex;flex-wrap:wrap;gap:8px}.ai-box textarea{width:100%;min-height:220px}.attempt{padding:12px;border:1px solid var(--line);border-radius:9px;margin-top:9px}.attempt pre{white-space:pre-wrap;word-break:break-word}.roadmap-stage{margin-bottom:14px}.roadmap-stage>summary{list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;font-weight:800;padding:15px 0}.roadmap-stage>summary::-webkit-details-marker{display:none}.roadmap-module{border-top:1px solid var(--line);padding:12px 0}.roadmap-module h3{font-size:15px}.lesson-row{display:grid;grid-template-columns:1fr auto auto;gap:10px;align-items:center;padding:8px 0;border-top:1px dashed #e7ebf0}.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:10px;background:#fff}table{width:100%;border-collapse:collapse;min-width:720px}th,td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--line);vertical-align:top}th{font-size:12px;text-transform:uppercase;color:var(--muted);background:#f8fafc}tr:last-child td{border-bottom:0}.filters,.form-grid,.form-stack{display:grid;gap:14px}.form-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.form-stack{grid-template-columns:1fr}label{display:grid;gap:6px;font-weight:650;font-size:14px}input,select,textarea{border:1px solid #cfd6df;border-radius:9px;padding:10px 11px;background:#fff;min-width:0}textarea{resize:vertical}.field-help{font-size:12px;color:var(--muted)}.skill-line{display:grid;grid-template-columns:110px 1fr auto;gap:12px;align-items:center;margin:10px 0}.empty{padding:24px;text-align:center;color:var(--muted);border:1px dashed #cfd6df;border-radius:10px}.auth-body{min-height:100vh;display:grid;place-items:center;padding:24px;background:#eef2f6}.auth-card{width:min(460px,100%);background:#fff;border:1px solid var(--line);border-radius:16px;padding:30px;box-shadow:0 20px 60px rgba(16,24,40,.12)}.auth-card h1{margin:.2rem 0}.install-card{width:min(760px,100%)}.check-list{border:1px solid var(--line);border-radius:10px;margin:16px 0}.check-list>div{display:flex;justify-content:space-between;padding:9px 12px;border-bottom:1px solid var(--line)}.check-list>div:last-child{border-bottom:0}.ok{color:var(--success)}.bad{color:var(--danger)}code,pre{font-family:"SFMono-Regular",Consolas,monospace}.code-box{white-space:pre-wrap;word-break:break-word;background:#101828;color:#e4e7ec;padding:15px;border-radius:9px;max-height:450px;overflow:auto}.chart{display:grid;gap:8px}.bar-row{display:grid;grid-template-columns:95px 1fr 42px;gap:8px;align-items:center}.bar-bg{height:10px;background:#eef2f6;border-radius:99px}.bar-fill{height:100%;background:var(--accent);border-radius:inherit}.mobile-nav{display:none}.mobile-only{display:none}.toast{position:fixed;right:22px;bottom:22px;background:#101828;color:#fff;padding:12px 16px;border-radius:10px;z-index:100;box-shadow:var(--shadow);max-width:360px}
@media(max-width:1024px){:root{--sidebar:210px}.main-content{padding:22px}.grid.four{grid-template-columns:repeat(2,1fr)}.lesson-shell{grid-template-columns:1fr}.lesson-aside{position:static}.grid.three{grid-template-columns:repeat(2,1fr)}}
@media(max-width:720px){:root{--sidebar:0px}.app-shell{padding-left:0}.sidebar{transform:translateX(-105%);width:260px;transition:transform .18s ease}.sidebar.open{transform:translateX(0)}.topbar{height:64px;padding:0 14px}.topbar>div:first-of-type .eyebrow{display:none}.user-chip{display:none}.mobile-only{display:inline-grid;place-items:center}.main-content{padding:16px 14px 86px}.page-head{display:block}.page-head .action-row{margin-top:12px}.grid.two,.grid.three,.grid.four,.form-grid{grid-template-columns:1fr}.session-card{grid-template-columns:1fr}.session-index{margin-bottom:-6px}.session-card>.btn{width:100%}.lesson-row{grid-template-columns:1fr auto}.lesson-row>a{grid-column:1/-1}.mobile-nav{position:fixed;display:grid;grid-template-columns:repeat(5,1fr);bottom:0;left:0;right:0;background:#fff;border-top:1px solid var(--line);z-index:25}.mobile-nav a{text-align:center;padding:13px 4px 11px;font-size:12px;color:#475467;font-weight:700}.auth-card{padding:22px}.answer-toolbar{align-items:flex-start;flex-direction:column}.action-row>.btn{flex:1}.topbar strong{font-size:14px}.skill-line{grid-template-columns:90px 1fr auto}}
@media(max-width:390px){.main-content{padding-left:12px;padding-right:12px}.card,.lesson-section{padding:16px}.page-head h1{font-size:24px}.btn{min-height:44px}.lesson-row{font-size:13px}.grid{gap:12px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}

/* Calm academic blue system. Components deliberately animate only feedback properties. */
:root{--bg:#F5F9FF;--surface:#FFF;--surface-2:#EEF6FF;--text:#183153;--muted:#6B7A90;--line:#D9E7F7;--accent:#2F80ED;--accent-2:#1F6ED4;--success:#1D9A6C;--warning:#D9822B;--danger:#D65353;--radius:20px;--shadow:0 10px 28px rgba(47,128,237,.08)}
.sidebar{background:#fff;color:var(--text);border-right:1px solid var(--line)}.brand{color:var(--text)}.brand small{color:var(--muted)}.brand-mark{background:var(--accent);color:#fff;border-radius:14px}.nav-link{color:var(--muted);display:flex;align-items:center;gap:10px;min-height:44px}.nav-link img,.mobile-nav img{width:20px;height:20px}.nav-link:hover,.nav-link.active{background:#DDEEFF;color:var(--text)}.sidebar-subnav{display:grid;gap:5px;margin:16px 8px}.sidebar-subnav a{font-size:13px;color:var(--muted);padding:8px 12px}.card,.lesson-section,.session-card{border-radius:22px}.btn{border-radius:13px;min-height:44px;transition:transform 160ms ease-out,background 180ms ease-out,color 180ms ease-out}.btn:active{transform:scale(.97)}.btn.small{min-height:36px}.today-primary{display:flex;align-items:center;justify-content:space-between;gap:24px;background:linear-gradient(135deg,#fff,#EEF6FF);border:1px solid var(--line);border-radius:24px;padding:28px;box-shadow:var(--shadow)}.today-primary h2{margin:5px 0;font-size:26px}.today-primary p{margin:6px 0}.today-secondary{margin-top:18px}.compact-row{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 0;border-top:1px solid var(--line)}.compact-row:first-of-type{border-top:0}.section-gap{margin-bottom:14px}.review-cards{display:grid;gap:12px}.review-card{display:flex;justify-content:space-between;gap:20px;border:1px solid var(--line);border-radius:16px;padding:16px;background:var(--surface-2)}.review-card h3{margin:8px 0 4px}.review-card p{margin:0 0 8px}.review-action{display:grid;align-content:center;gap:8px;min-width:190px}.text-link{font-size:13px;text-align:center}.icon-btn img{width:20px;height:20px}.mobile-nav a{min-height:58px;display:grid;justify-items:center;align-content:center;gap:2px;padding:5px 2px}.mobile-nav img{width:18px;height:18px}
@media(max-width:720px){.today-primary,.review-card{display:grid}.today-primary .btn{width:100%}.review-action{min-width:0}.sidebar{transition:transform 180ms ease-out}.mobile-nav a{font-size:10px}.mobile-nav{padding-bottom:env(safe-area-inset-bottom)}}
@media(prefers-reduced-motion:reduce){.btn,.sidebar{transition:background 160ms ease,color 160ms ease!important}}