:root{--bg:#f4f6f9;--panel:#fff;--ink:#172033;--muted:#647084;--line:#dfe5ec;--brand:#213454;--soft:#edf2f7;--accent:#b98434;--good:#267454;--warn:#8b5b13;--bad:#8f3d3d;--shadow:0 8px 30px rgba(23,32,51,.08);--radius:16px}
*{box-sizing:border-box} html{scroll-behavior:smooth} body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.45 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
button,input,select{font:inherit} button{cursor:pointer} a{color:inherit}.hidden{display:none!important}
.app{max-width:1180px;margin:0 auto;min-height:100vh;padding:18px}
header{display:flex;gap:16px;justify-content:space-between;align-items:center;margin-bottom:16px}.brand h1{font-size:1.35rem;margin:0}.brand p{margin:2px 0 0;color:var(--muted);font-size:.9rem}
.mode{display:flex;gap:8px;align-items:center}.pill{border:1px solid var(--line);background:var(--panel);border-radius:999px;padding:8px 11px;color:var(--muted)}
.layout{display:grid;grid-template-columns:220px 1fr;gap:16px}.nav{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:10px;height:max-content;position:sticky;top:14px;box-shadow:var(--shadow)}
.nav button{width:100%;text-align:left;border:0;background:transparent;padding:10px 12px;border-radius:10px;color:var(--ink);margin:1px 0}.nav button.active{background:var(--brand);color:#fff}.nav small{display:block;color:var(--muted);padding:10px 12px 4px;text-transform:uppercase;letter-spacing:.06em;font-weight:700;font-size:.68rem}
main{min-width:0}.screen{display:none}.screen.active{display:block}.hero,.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.hero{padding:22px}.card{padding:18px}.hero h2,.card h3{margin-top:0}.sub{color:var(--muted)}
.grid{display:grid;gap:14px}.g2{grid-template-columns:repeat(2,minmax(0,1fr))}.g3{grid-template-columns:repeat(3,minmax(0,1fr))}.g4{grid-template-columns:repeat(4,minmax(0,1fr))}.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-top:16px}.stat{background:var(--soft);border-radius:13px;padding:14px}.stat b{display:block;font-size:1.35rem;margin-top:4px}.stat span{font-size:.8rem;color:var(--muted)}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.between{justify-content:space-between}.stack{display:flex;flex-direction:column;gap:12px}.section-title{display:flex;justify-content:space-between;align-items:end;gap:10px;margin:18px 0 10px}.section-title h2{margin:0;font-size:1.05rem}.section-title p{margin:0;color:var(--muted);font-size:.88rem}
.btn{border:0;background:var(--brand);color:#fff;border-radius:10px;padding:10px 14px;font-weight:650}.btn.secondary{background:var(--soft);color:var(--ink);border:1px solid var(--line)}.btn.ghost{background:transparent;color:var(--brand);border:1px solid var(--line)}.btn.warn{background:#7b5319}.btn:disabled{opacity:.45;cursor:not-allowed}
label{font-weight:650;font-size:.88rem}.field{display:flex;flex-direction:column;gap:6px}.field input,.field select{width:100%;border:1px solid #cbd4df;border-radius:10px;padding:10px;background:#fff;color:var(--ink)}.field small{color:var(--muted)}
.event{border:1px solid var(--line);border-radius:14px;padding:15px;background:#fff}.event.done{opacity:.64}.tag{display:inline-block;border-radius:999px;background:var(--soft);padding:4px 8px;font-size:.75rem;font-weight:700;color:var(--muted)}.tag.need{background:#e7f1ed;color:#236247}.tag.want{background:#fff1da;color:#765219}.tag.recurring{background:#eeeaf8;color:#59498d}.tag.save{background:#e8eef9;color:#375786}.tag.info{background:#eef0f3;color:#425065}
.hint{border-left:4px solid #99a8bc;background:#f5f8fb;padding:10px 12px;border-radius:8px;color:#405069;font-size:.9rem}.callout{border:1px dashed #c5ced9;background:#f8fafc;border-radius:12px;padding:12px}.warning{border-left:4px solid #c38a31;background:#fff8e8;padding:10px 12px;border-radius:8px;color:#6b4b18}
.progressbar{height:10px;background:#e8edf3;border-radius:999px;overflow:hidden}.progressbar>div{height:100%;background:var(--brand);border-radius:999px;transition:width .25s ease}.money{font-variant-numeric:tabular-nums}.positive{color:var(--good)}.negative{color:var(--bad)}
table{width:100%;border-collapse:collapse;font-size:.9rem}th,td{text-align:left;border-bottom:1px solid var(--line);padding:10px 8px;vertical-align:top}th{color:var(--muted);font-size:.78rem;text-transform:uppercase;letter-spacing:.04em}
.choice{display:grid;grid-template-columns:1fr auto;gap:12px;align-items:center}.choice + .choice{border-top:1px solid var(--line);padding-top:12px;margin-top:12px}.result{margin-top:10px;padding:10px;border-radius:9px;background:var(--soft)}
.module{padding:12px;border:1px solid var(--line);border-radius:12px}.module b{display:block}.module small{color:var(--muted)}
.footer-note{margin:18px 0;color:var(--muted);font-size:.8rem;text-align:center}
dialog{border:0;border-radius:16px;box-shadow:0 24px 80px rgba(0,0,0,.25);max-width:560px;width:calc(100% - 30px);padding:0}dialog::backdrop{background:rgba(18,25,38,.45)}.modal{padding:20px}
:focus-visible{outline:3px solid #77a3d9;outline-offset:2px}

/* v2.6 course shell */
.instructor-tools{border-top:1px solid var(--line);margin-top:10px;padding-top:8px}.instructor-tools summary{cursor:pointer;color:var(--muted);font-size:.78rem;font-weight:700;padding:9px 12px;border-radius:9px}.instructor-tools[open] summary{margin-bottom:3px}.instructor-tools button{font-size:.88rem}
.course-trail{display:flex;align-items:center;gap:12px;margin-bottom:12px;padding:10px 12px;background:var(--panel);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow)}.course-trail div{min-width:0;display:flex;flex-direction:column}.course-trail small{color:var(--muted);font-size:.72rem;text-transform:uppercase;letter-spacing:.05em}.course-trail b{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.course-flow{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:8px;margin:18px 0}.course-flow span{display:flex;align-items:center;gap:7px;background:var(--soft);border-radius:11px;padding:10px;font-size:.82rem;font-weight:650}.course-flow b{display:grid;place-items:center;width:24px;height:24px;border-radius:999px;background:var(--brand);color:#fff;font-size:.75rem;flex:0 0 auto}
.course-modules{gap:14px}.course-module{padding:0;overflow:hidden}.course-module-head{display:flex;justify-content:space-between;align-items:flex-start;gap:14px;padding:18px}.course-module-head h3{margin:3px 0 4px;font-size:1.15rem}.course-module-head p{margin:0}.course-module-number{display:block;color:var(--muted);font-size:.75rem;text-transform:uppercase;letter-spacing:.07em;font-weight:800}
.course-lesson-list{border-top:1px solid var(--line)}.course-lesson{width:100%;display:flex;justify-content:space-between;align-items:center;gap:16px;text-align:left;background:transparent;color:var(--ink);border:0;border-bottom:1px solid var(--line);padding:14px 18px}.course-lesson:last-child{border-bottom:0}.course-lesson:hover{background:var(--soft)}.course-lesson>span:first-child{display:flex;flex-direction:column;gap:3px}.course-lesson small{color:var(--muted);font-size:.85rem}.course-lesson-action{font-weight:750;color:var(--brand);white-space:nowrap;font-size:.86rem}
.course-card-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:16px}.course-action-card{display:block;width:100%;text-align:left;color:var(--ink);cursor:pointer}.course-action-card:hover{border-color:#aeb9c8;transform:translateY(-1px)}.course-action-card h3{margin:10px 0 6px}.course-action-card p{margin:0 0 14px;color:var(--muted)}.course-action-card b{color:var(--brand)}
.quick-ref h3{margin-bottom:8px}.quick-ref p:first-of-type{margin-top:0}.quick-ref p:last-child,.quick-ref ol:last-child{margin-bottom:0}.refs-grid{align-items:start}

@media(max-width:900px){.layout{grid-template-columns:1fr}.nav{position:static;display:flex;overflow-x:auto;gap:5px;padding:8px}.nav small{display:none}.nav button{width:auto;white-space:nowrap}.nav .instructor-tools{border-top:0;border-left:1px solid var(--line);margin:0 0 0 4px;padding:0 0 0 8px;flex:0 0 auto}.instructor-tools summary{white-space:nowrap}.instructor-tools[open]{display:flex;align-items:center}.instructor-tools[open] summary{margin:0}.instructor-tools button{width:auto}.stats,.g4{grid-template-columns:repeat(2,minmax(0,1fr))}.course-flow{grid-template-columns:repeat(5,minmax(135px,1fr));overflow-x:auto;padding-bottom:4px}}
@media(max-width:620px){.app{padding:10px}.brand p{display:none}.g2,.g3,.stats,.g4{grid-template-columns:1fr}.hero,.card{padding:15px}.choice{grid-template-columns:1fr}.row.mobile-stack{align-items:stretch;flex-direction:column}.row.mobile-stack .btn{width:100%}.course-card-grid{grid-template-columns:1fr}.course-module-head{padding:15px;flex-direction:column}.course-module-head .tag{align-self:flex-start}.course-lesson{align-items:flex-start;padding:13px 15px}.course-lesson-action{font-size:.8rem}.course-trail{align-items:flex-start;flex-direction:column}.course-trail .btn{width:100%}.course-flow{margin:14px -2px}.course-flow span{min-width:135px}}
body[data-theme="dark"]{--bg:#151922;--panel:#202631;--ink:#f1f4f8;--muted:#b6c0cd;--line:#394353;--brand:#d5deec;--soft:#293140;--shadow:none}body[data-theme="dark"] .nav button.active{background:#e4eaf2;color:#18202c}body[data-theme="dark"] .btn{background:#e4eaf2;color:#18202c}body[data-theme="dark"] .btn.secondary,body[data-theme="dark"] .btn.ghost{background:#293140;color:#f1f4f8;border-color:#4b5668}body[data-theme="dark"] .field input,body[data-theme="dark"] .field select,body[data-theme="dark"] .event{background:#202631;color:#f1f4f8;border-color:#4b5668}body[data-theme="dark"] .hint,body[data-theme="dark"] .callout,body[data-theme="dark"] .result{background:#293140;color:#eef2f7}body[data-theme="dark"] .course-flow b{background:#e4eaf2;color:#18202c}body[data-theme="dark"] .course-lesson-action,body[data-theme="dark"] .course-action-card b{color:#d5deec}body[data-density="low"] main{max-width:860px}body[data-density="low"] .card,body[data-density="low"] .hero{line-height:1.55}body[data-density="low"] .stack{gap:18px}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}.course-action-card:hover{transform:none}}