:root{font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color-scheme:light;--bg:#f6f5f0;--surface:#fff;--ink:#202a25;--muted:#68736b;--line:#e6e9e1;--green:#245d45;--green2:#d9e9dc;--mint:#edf4e9;--orange:#e9a66e;--lavender:#e9e6f4;--focus:#8b5cf6;--shadow:0 12px 36px rgba(30,59,44,.07)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-size:16px;line-height:1.5}button,input,textarea{font:inherit}button{cursor:pointer;touch-action:manipulation}button:disabled{cursor:not-allowed;opacity:.55}button:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid var(--focus);outline-offset:2px}.icon-sprite{position:absolute;width:0;height:0;overflow:hidden}.icon{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex:none}.app-shell{max-width:600px;min-height:100dvh;margin:auto;background:var(--bg);position:relative;padding-bottom:calc(86px + env(safe-area-inset-bottom))}.topbar{height:calc(70px + env(safe-area-inset-top));padding:env(safe-area-inset-top) 22px 0;display:flex;align-items:center;gap:10px}.brand-mark{width:26px;height:26px;display:flex;gap:3px;align-items:flex-end}.brand-mark span{background:var(--green);border-radius:3px;width:6px;transform:rotate(-20deg)}.brand-mark span:nth-child(1){height:10px}.brand-mark span:nth-child(2){height:18px}.brand-mark span:nth-child(3){height:25px}.brand-name{font-size:16px;font-weight:800;letter-spacing:-.04em}.mode-pill{margin-left:auto;border:1px solid var(--line);border-radius:999px;padding:5px 10px;font-size:10px;font-weight:800;letter-spacing:.12em;color:var(--muted)}main{padding:12px 20px 24px}.eyebrow{color:var(--green);font-size:12px;font-weight:800;letter-spacing:.15em;text-transform:uppercase}.page-title{font-size:clamp(30px,8vw,42px);line-height:1.08;letter-spacing:-.055em;margin:10px 0 12px;font-weight:800}.lead{color:var(--muted);margin:0 0 26px;max-width:47ch}.section-head{display:flex;align-items:baseline;justify-content:space-between;gap:10px;margin:26px 0 13px}.section-title{font-size:21px;letter-spacing:-.035em;margin:0}.text-button{border:0;background:none;color:var(--green);font-weight:700;padding:8px 0;min-height:44px}.hero{background:var(--green);color:#fff;border-radius:28px;padding:24px;position:relative;overflow:hidden;box-shadow:var(--shadow)}.hero:after{content:"";position:absolute;right:-38px;top:-62px;border:38px solid rgba(255,255,255,.08);border-radius:50%;height:172px;width:172px}.hero-kicker{font-size:12px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:#cce2d2}.hero h2{font-size:27px;line-height:1.15;letter-spacing:-.04em;margin:13px 0 8px;max-width:245px}.hero p{color:#e1eee3;font-size:14px;max-width:260px;margin:0 0 20px}.button{display:inline-flex;align-items:center;justify-content:center;gap:9px;border:0;border-radius:16px;min-height:48px;padding:12px 18px;font-weight:750;transition:background .18s,transform .18s,opacity .18s;text-align:center}.button:active,.tile:active,.topic-card:active,.nav-item:active{transform:scale(.98)}.button-light{background:#fff;color:var(--green)}.button-primary{background:var(--green);color:#fff}.button-primary:hover{background:#1c4937}.button-soft{background:var(--mint);color:var(--green)}.button-outline{background:transparent;border:1px solid var(--line);color:var(--ink)}.button-full{width:100%}.button .icon{width:18px;height:18px}.goal-row{display:flex;align-items:center;gap:20px;margin-top:22px}.ring{width:74px;height:74px;border-radius:50%;display:grid;place-items:center;flex:none;background:conic-gradient(var(--green) var(--progress),#dfe9db 0);position:relative}.ring:after{content:"";position:absolute;inset:9px;border-radius:50%;background:var(--bg)}.ring strong{z-index:1;font-size:18px}.goal-copy strong{display:block;font-size:18px;letter-spacing:-.025em}.goal-copy span{color:var(--muted);font-size:14px}.stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.stat-card,.panel{background:var(--surface);border:1px solid var(--line);border-radius:22px}.stat-card{padding:19px}.stat-icon{width:38px;height:38px;border-radius:12px;background:var(--mint);color:var(--green);display:grid;place-items:center}.stat-card:nth-child(2) .stat-icon{background:#f9ebde;color:#99582b}.stat-card strong{display:block;font-size:28px;letter-spacing:-.045em;margin-top:16px;line-height:1}.stat-card span{display:block;color:var(--muted);font-size:13px;margin-top:5px}.panel{padding:19px}.week{display:flex;align-items:end;justify-content:space-between;gap:8px;height:108px}.bar-group{text-align:center;flex:1;color:var(--muted);font-size:12px}.bar-track{height:75px;border-radius:7px;background:var(--mint);display:flex;align-items:end;overflow:hidden;margin-bottom:8px}.bar{width:100%;background:var(--green2);border-radius:7px;min-height:4px}.bar.today{background:var(--green)}.topic-list{display:grid;gap:12px}.topic-card{border:1px solid var(--line);background:var(--surface);border-radius:22px;padding:17px 17px 17px 18px;display:flex;align-items:center;gap:16px;text-align:left;width:100%;transition:transform .18s,border-color .18s}.topic-card:hover{border-color:#afcbb8}.topic-glyph{width:48px;height:48px;border-radius:15px;display:grid;place-items:center;flex:none;font-size:23px;font-weight:800;color:var(--green);background:var(--mint)}.topic-card:nth-child(even) .topic-glyph{background:var(--lavender);color:#655b8e}.topic-info{flex:1;min-width:0}.topic-info strong{display:block;font-size:16px;line-height:1.25;overflow-wrap:anywhere}.topic-info small{display:block;color:var(--muted);font-size:13px;margin-top:5px}.topic-card .icon{color:var(--muted)}.add-card{border:1px dashed #a7b9ab;border-radius:22px;background:transparent;color:var(--green);width:100%;min-height:70px;display:flex;align-items:center;justify-content:center;gap:10px;font-weight:750}.add-card:hover{background:var(--mint)}.back-row{display:flex;align-items:center;gap:10px;margin-bottom:18px}.back-button{border:0;background:var(--surface);border-radius:13px;width:44px;height:44px;display:grid;place-items:center;color:var(--ink)}.breadcrumb{font-size:13px;color:var(--muted);font-weight:600}.detail-header{display:flex;align-items:center;gap:16px}.detail-header .topic-glyph{width:60px;height:60px;border-radius:19px;font-size:27px}.detail-header h1{margin:0;font-size:30px;letter-spacing:-.045em;line-height:1.13}.detail-header p{margin:5px 0 0;color:var(--muted);font-size:13px}.intro{margin:22px 0 10px;color:var(--muted)}.tile-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:15px}.tile{border:1px solid var(--line);border-radius:22px;background:var(--surface);min-height:152px;text-align:left;padding:17px;display:flex;flex-direction:column;align-items:flex-start;justify-content:space-between;transition:transform .18s,border-color .18s}.tile:hover{border-color:#a5bea9}.tile:nth-child(2){background:#f1efe9}.tile:nth-child(3){background:#e7f0e8}.tile:nth-child(4){background:#eeeaf4}.tile .icon{width:26px;height:26px;color:var(--green)}.tile strong{font-size:17px;letter-spacing:-.025em;line-height:1.18}.tile small{color:var(--muted);font-size:12px;margin-top:3px}.tile .badge{font-size:11px;background:#d6694d;color:white;padding:3px 7px;border-radius:999px;margin-left:5px}.map-center{background:var(--green);color:#fff;padding:19px;border-radius:18px;font-weight:800;text-align:center;margin:12px 0 16px;overflow-wrap:anywhere}.map-list{display:grid;gap:10px;padding-left:20px;border-left:2px solid var(--green2);margin-left:18px}.map-node{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:13px 15px;font-weight:650}.map-node:before{content:"";position:absolute;left:-22px;top:24px;width:20px;border-top:2px solid var(--green2)}.flash-card{width:100%;min-height:225px;background:var(--green);color:#fff;border:0;border-radius:25px;padding:28px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;box-shadow:var(--shadow)}.flash-card strong{font-size:24px;line-height:1.25;letter-spacing:-.03em}.flash-card span{font-size:13px;opacity:.8;margin-top:18px}.flash-card.revealed{background:#e3ebde;color:var(--ink)}.flash-card.revealed span{opacity:1;color:var(--muted)}.progress-label{color:var(--muted);font-size:13px;margin:0 0 12px}.action-row{display:flex;gap:10px;margin-top:15px}.action-row .button{flex:1}.question{font-size:22px;line-height:1.25;font-weight:750;letter-spacing:-.03em;margin:14px 0 18px}.option-list{display:grid;gap:10px}.option{background:var(--surface);border:1px solid var(--line);border-radius:15px;padding:14px 16px;text-align:left;min-height:50px}.option:hover:not(:disabled){border-color:var(--green)}.option.selected{border-color:var(--green);background:var(--mint)}.option.correct{border-color:#3f9363;background:#e0f4e5}.option.wrong{border-color:#cc6a5c;background:#fbe9e5}.feedback{border-radius:16px;padding:14px 16px;margin:14px 0;font-size:14px;font-weight:650;background:var(--mint);color:var(--green)}.feedback.error{background:#fbe9e5;color:#963c32}.field{display:block;font-weight:700;font-size:14px;margin:18px 0 8px}.input{display:block;width:100%;border:1px solid #c9d3cb;border-radius:15px;padding:14px 15px;min-height:50px;background:var(--surface);color:var(--ink);font-size:16px}.input::placeholder{color:#89938b}.field-help{font-size:13px;color:var(--muted);margin:7px 0 0}.form-error{font-size:13px;color:#a3312c;margin:6px 0 0;min-height:18px}.setting-row{display:flex;justify-content:space-between;align-items:center;gap:15px}.setting-row strong{display:block;font-size:16px}.setting-row span{display:block;font-size:13px;color:var(--muted);margin-top:3px}.stepper{display:flex;align-items:center;gap:10px}.stepper button{border:1px solid var(--line);background:var(--surface);border-radius:13px;width:44px;height:44px;font-size:24px;color:var(--green)}.stepper output{font-weight:800;min-width:23px;text-align:center}.separator{height:1px;background:var(--line);margin:18px 0}.notice{background:#edf3e8;border-radius:17px;padding:15px;color:#42614a;font-size:13px;margin-top:18px}.empty{border:1px dashed #b8c6ba;border-radius:20px;padding:25px;text-align:center;color:var(--muted)}.empty strong{display:block;color:var(--ink);margin-bottom:5px}.bottom-nav{position:fixed;bottom:0;left:50%;transform:translateX(-50%);width:min(100%,600px);height:calc(72px + env(safe-area-inset-bottom));padding:8px 12px env(safe-area-inset-bottom);display:flex;justify-content:space-around;gap:8px;background:rgba(255,255,255,.97);border-top:1px solid var(--line);z-index:10}.nav-item{min-width:90px;flex:1;border:0;background:transparent;color:#718078;border-radius:15px;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:2px;font-size:11px;font-weight:700;transition:background .18s,transform .18s}.nav-item.active{color:var(--green);background:var(--mint)}.toast{position:fixed;z-index:20;bottom:calc(86px + env(safe-area-inset-bottom));left:50%;transform:translate(-50%,20px);background:var(--ink);color:#fff;border-radius:14px;padding:12px 16px;box-shadow:var(--shadow);width:max-content;max-width:calc(100vw - 40px);opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;font-size:13px}.toast.show{opacity:1;transform:translate(-50%,0)}
.tile strong,.tile small{display:block}.tile strong{margin-bottom:3px}.tile .badge{display:inline-block;vertical-align:middle}
@media(min-width:768px){body{padding:20px}.app-shell{border-radius:28px;box-shadow:0 14px 60px #2137261a;min-height:calc(100dvh - 40px);overflow:hidden}.bottom-nav{width:min(100%,600px)}}
@media(max-width:370px){main{padding-inline:15px}.topbar{padding-inline:17px}.tile{padding:14px;min-height:142px}.tile strong{font-size:15px}.nav-item{min-width:0}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}

/* Topic and skill journeys */
.section-count{color:var(--muted);font-size:14px;font-weight:800}.home-cta,.activity-footer{margin-top:18px}.plan-list,.exercise-list,.chapter-list{display:grid;gap:10px}.plan-card,.exercise-card{width:100%;border:1px solid var(--line);border-radius:19px;background:var(--surface);min-height:72px;padding:12px 14px;display:flex;align-items:center;gap:14px;text-align:left;color:var(--ink);transition:border-color .18s,transform .18s}.plan-card:hover,.exercise-card:hover{border-color:#9fbaa8}.plan-card:active,.exercise-card:active{transform:scale(.99)}.plan-card>span:nth-child(2),.exercise-copy{flex:1;min-width:0}.plan-card strong,.exercise-copy strong{display:block;overflow-wrap:anywhere;font-size:15px;line-height:1.3}.plan-card small,.exercise-copy small{display:block;color:var(--muted);font-size:12px;margin-top:3px}.plan-card>.icon,.exercise-card>.icon{color:var(--muted)}.plan-marker{width:42px;height:42px;border-radius:13px;background:var(--mint);color:var(--green);display:grid;place-items:center;flex:none}.plan-marker.skill-marker,.skill-glyph{background:#f5e9dc;color:#8d4e27}.topic-next{display:block;color:var(--green);font-size:12px;font-weight:700;margin-top:5px}.topic-next.completed{color:var(--muted)}.due-dot{width:9px;height:9px;border-radius:50%;background:#d85b49;box-shadow:0 0 0 4px #d85b491c;display:inline-block;flex:none}.add-panel{margin-top:16px}.detail-help{margin-top:16px}.phase-head{display:flex;align-items:center;gap:12px;margin:29px 0 15px}.phase-head>div{flex:1}.phase-head h2{margin:0;font-size:20px;line-height:1.15;letter-spacing:-.035em}.phase-head p{margin:4px 0 0;color:var(--muted);font-size:12px}.phase-number{width:43px;height:43px;border-radius:14px;background:var(--green);color:#fff;display:grid;place-items:center;font-size:14px;font-weight:800;flex:none}.phase-check{font-size:11px;color:var(--green);font-weight:800}.tile-grid+.phase-head{margin-top:30px}.exercise-num{font-weight:800;font-size:15px;color:var(--green);background:var(--mint);width:40px;height:40px;border-radius:12px;display:grid;place-items:center;flex:none}.source-list{display:grid;gap:0}.source-list a{display:flex;align-items:center;justify-content:space-between;color:var(--green);font-weight:700;text-decoration:none;min-height:44px;border-bottom:1px solid var(--line)}.source-list a:last-child{border-bottom:0}.source-list .icon{width:18px;height:18px}.exercise-detail p{margin-top:0}.exercise-detail ol{padding-left:22px;margin-bottom:0}.exercise-detail li{padding-left:4px;margin:12px 0}.exercise-detail li::marker{color:var(--green);font-weight:800}
.slide-card{background:var(--green);color:#fff;border-radius:26px;min-height:390px;padding:27px;display:flex;flex-direction:column}.slide-number{color:#c6e1cf;font-size:12px;letter-spacing:.14em;font-weight:800}.slide-card h2{font-size:28px;line-height:1.13;letter-spacing:-.04em;margin:22px 0 14px}.slide-card ul{padding-left:19px;margin:0 0 20px}.slide-card li{margin:9px 0}.slide-example{margin-top:auto;background:#ffffff1b;border-radius:15px;padding:14px 16px;font-size:14px}.slide-example strong,.example strong{font-size:12px;letter-spacing:.09em;text-transform:uppercase}.slide-example p,.example p{margin:6px 0 0}.chapter{border:1px solid var(--line);background:var(--surface);border-radius:17px;overflow:hidden}.chapter summary{cursor:pointer;list-style:none;display:flex;align-items:center;gap:12px;padding:16px;min-height:58px}.chapter summary::-webkit-details-marker{display:none}.chapter summary span{color:var(--green);font-weight:800}.chapter summary strong{font-size:16px;line-height:1.25}.chapter[open] summary{border-bottom:1px solid var(--line)}.chapter-body{padding:16px;color:var(--ink);font-size:14px}.chapter-body>p{margin:0 0 12px}.chapter-summary{font-weight:750}.example{background:var(--mint);border-radius:13px;padding:13px;color:var(--green)}.textarea{resize:vertical;min-height:118px;line-height:1.5}.form-submit{margin-top:16px}.prose-answer{white-space:normal;line-height:1.65}.recall-prompt{margin-top:16px;background:var(--green);color:#fff;border-radius:18px;padding:23px;display:grid;gap:7px}.recall-prompt span,.recall-prompt small{color:#d7e8dc;font-size:12px}.recall-prompt strong{font-size:22px;line-height:1.2}.result-reference{margin:7px 0 0;font-size:13px;font-weight:400}.rating-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin-top:12px}.rating-grid button{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:14px;min-height:60px;padding:7px 4px;font-size:12px;font-weight:800;line-height:1.2}.rating-grid button:first-child{background:#fcece8;color:#9e463a}.rating-grid button:last-child{background:var(--mint);color:var(--green)}.rating-grid button small{display:block;font-size:10px;font-weight:500;margin-top:3px}.photo-picker{display:flex;align-items:center;gap:10px;border:1px dashed #9bac9c;border-radius:15px;min-height:50px;padding:11px 14px;margin-top:12px;color:var(--green);font-weight:700;cursor:pointer;overflow-wrap:anywhere}.photo-picker .icon{width:20px;height:20px}.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.field-first{margin-top:0}.toggle{width:52px;height:31px;border:0;border-radius:30px;background:#c8d4c9;padding:3px;flex:none;display:flex;align-items:center;transition:background .2s}.toggle span{display:block;width:25px;height:25px;background:#fff;border-radius:50%;box-shadow:0 2px 5px #0002;transition:transform .2s}.toggle.on{background:var(--green)}.toggle.on span{transform:translateX(21px)}.settings-link{border:0;background:var(--mint);color:var(--green);border-radius:12px;padding:10px 13px;min-height:44px;font-size:13px;font-weight:800}.settings-link.danger{background:#fbeae7;color:#a43c35}.about-panel p{color:var(--muted);font-size:14px;margin-bottom:0}
:root[data-theme=dark]{color-scheme:dark;--bg:#17221b;--surface:#223027;--ink:#f0f5ee;--muted:#b5c5b8;--line:#3a4a3e;--green:#96cda6;--green2:#3c6649;--mint:#2c4533;--lavender:#393549;--shadow:0 12px 36px rgba(0,0,0,.2)}:root[data-theme=dark] .hero,:root[data-theme=dark] .map-center,:root[data-theme=dark] .flash-card,:root[data-theme=dark] .phase-number,:root[data-theme=dark] .slide-card,:root[data-theme=dark] .recall-prompt{background:#2d6543;color:#fff}:root[data-theme=dark] .button-primary{background:#78ba8a;color:#102117}:root[data-theme=dark] .button-light{background:#f0f5ee;color:#17462a}:root[data-theme=dark] .tile:nth-child(2){background:#2c332b}:root[data-theme=dark] .tile:nth-child(3){background:#29402f}:root[data-theme=dark] .tile:nth-child(4){background:#343042}:root[data-theme=dark] .bottom-nav{background:#223027f5}:root[data-theme=dark] .input{background:var(--surface);border-color:var(--line)}:root[data-theme=dark] .option.correct{background:#245135}:root[data-theme=dark] .option.wrong,:root[data-theme=dark] .feedback.error{background:#4b2c2a;color:#ffd3cd}:root[data-theme=dark] .feedback{background:#2d5036;color:#d6f3dc}:root[data-theme=dark] .notice{background:#2c4533;color:#d2ead7}:root[data-theme=dark] .rating-grid button:first-child{background:#49312d;color:#ffd0c6}:root[data-theme=dark] .settings-link.danger{background:#49312d;color:#ffc8be}:root[data-theme=dark] .ring:after{background:var(--bg)}:root[data-theme=dark] .ring{background:conic-gradient(var(--green) var(--progress),#3a4a3e 0)}
@media(max-width:370px){.rating-grid button{font-size:11px}.phase-head h2{font-size:18px}.plan-card,.exercise-card{gap:9px}}
.secondary-cta{margin-top:10px}.draft-note{background:var(--mint);color:var(--green);border-radius:13px;padding:11px 13px;font-size:13px;font-weight:650;margin:0 0 15px}
.upgrade-cta{margin-top:11px}
.skip-link{position:fixed;z-index:30;top:-60px;left:12px;background:var(--surface);color:var(--ink);padding:10px 14px;border-radius:10px}.skip-link:focus{top:12px}