:root{--accent: #8b5cf6;--accent-strong: #7c3aed;--success: #22c55e;--danger: #ef4444;--warning: #f97316;--bg: #f6f4fb;--surface: #ffffff;--surface-2: #efecf7;--text: #241f35;--text-muted: #6c6684;--border: #ddd7ec;--ring-track: #e4dff2;--shadow: 0 1px 3px rgb(36 31 53 / .1);--radius: 14px;--radius-small: 9px;--space: 1rem;--font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;--font-mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;--nav-height: 62px}@media(prefers-color-scheme:dark){:root:not([data-theme=light]){--bg: #0f0a1e;--surface: #1a1430;--surface-2: #241c40;--text: #ece7f6;--text-muted: #9a8fb5;--border: #322a52;--ring-track: #2c2449;--shadow: 0 1px 3px rgb(0 0 0 / .4)}}:root[data-theme=dark]{--bg: #0f0a1e;--surface: #1a1430;--surface-2: #241c40;--text: #ece7f6;--text-muted: #9a8fb5;--border: #322a52;--ring-track: #2c2449;--shadow: 0 1px 3px rgb(0 0 0 / .4)}*,*:before,*:after{box-sizing:border-box}body{margin:0;font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.55;-webkit-font-smoothing:antialiased}button{font:inherit;color:inherit;cursor:pointer;border:none;background:none}button:disabled{cursor:default}#app{max-width:640px;margin:0 auto;min-height:100dvh;padding-bottom:calc(var(--nav-height) + env(safe-area-inset-bottom,0px))}.view{padding:var(--space);display:flex;flex-direction:column;gap:var(--space)}.view-title{margin:0;font-size:1.4rem}.bottom-nav{position:fixed;inset-inline:0;bottom:0;height:calc(var(--nav-height) + env(safe-area-inset-bottom,0px));padding-bottom:env(safe-area-inset-bottom,0px);display:flex;justify-content:center;gap:.5rem;background:var(--surface);border-top:1px solid var(--border);z-index:10}.bottom-nav[hidden]{display:none}.nav-item{flex:0 1 120px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;color:var(--text-muted);font-size:.7rem}.nav-item .nav-icon{font-size:1.25rem}.nav-item.is-active{color:var(--accent)}.stats-header{position:sticky;top:0;z-index:5;display:flex;align-items:center;justify-content:space-between;gap:var(--space);padding:.6rem var(--space);background:var(--surface);border-bottom:1px solid var(--border)}.stats-items{display:flex;gap:.9rem;flex-wrap:wrap}.stat{font-weight:700;font-size:.95rem}.goal-ring{width:56px;height:56px;flex:none}.goal-ring svg{width:100%;height:100%}.goal-ring-value{font-size:15px;font-weight:800;fill:var(--text)}.goal-ring-label{font-size:10px;fill:var(--text-muted)}.continue-hero{display:flex;align-items:center;justify-content:space-between;gap:.75rem;padding:var(--space);border-radius:var(--radius);background:linear-gradient(135deg,var(--accent),var(--accent-strong));color:#fff;box-shadow:var(--shadow)}.continue-hero-label{margin:0;font-size:.75rem;text-transform:uppercase;letter-spacing:.06em;opacity:.85}.continue-hero-title{margin:.1rem 0 0;font-weight:800}.continue-hero .btn{background:#fff;color:var(--accent-strong);flex:none}.course{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:var(--space);box-shadow:var(--shadow)}.course-skeleton{opacity:.75}.course-header{display:flex;align-items:baseline;justify-content:space-between;gap:.5rem}.course-title{margin:0;font-size:1.1rem}.course-progress{color:var(--text-muted);font-size:.85rem;font-weight:700;white-space:nowrap}.course-description{margin:.25rem 0 .75rem;color:var(--text-muted);font-size:.9rem}.unit-title{margin:.75rem 0 .25rem;font-size:.8rem;text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted)}.path{display:flex;flex-direction:column;gap:.5rem}.path-node{display:flex;align-items:center;gap:.75rem;width:100%;text-align:left;padding:.6rem .75rem;border-radius:var(--radius-small);border:1px solid var(--border);background:var(--surface-2);transition:transform .08s ease}.path-node:not(:disabled):active{transform:scale(.98)}.path-node-icon{flex:none;width:2.1rem;height:2.1rem;display:grid;place-items:center;border-radius:50%;background:var(--border);font-weight:800}.path-node-text{display:flex;flex-direction:column;min-width:0}.path-node-title{font-weight:600}.path-node-meta{font-size:.75rem;color:var(--text-muted)}.path-node.status-completed .path-node-icon{background:var(--success);color:#fff}.path-node.status-current{border-color:var(--accent);box-shadow:0 0 0 2px color-mix(in srgb,var(--accent) 35%,transparent)}.path-node.status-current .path-node-icon{background:var(--accent);color:#fff}.path-node.status-locked,.path-node.status-coming_soon{opacity:.55}.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:var(--space);box-shadow:var(--shadow)}.panel-title{margin:0 0 .5rem;font-size:1rem}.panel-note{margin:.25rem 0 .5rem;color:var(--text-muted);font-size:.85rem}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.5rem}.stat-tile{display:flex;flex-direction:column;align-items:center;gap:.1rem;padding:.5rem .25rem;background:var(--surface-2);border-radius:var(--radius-small);text-align:center}.stat-tile-icon{font-size:1.1rem}.stat-tile-value{font-weight:800}.stat-tile-label{font-size:.7rem;color:var(--text-muted)}.badge-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:.5rem}.badge{display:flex;flex-direction:column;gap:.15rem;padding:.6rem;border-radius:var(--radius-small);background:var(--surface-2);border:1px solid var(--border)}.badge.is-locked{opacity:.45;filter:grayscale(1)}.badge-icon{font-size:1.3rem}.badge-title{font-weight:700;font-size:.85rem}.badge-desc{font-size:.72rem;color:var(--text-muted)}.btn{display:inline-flex;align-items:center;justify-content:center;padding:.7rem 1.2rem;border-radius:var(--radius-small);font-weight:700;transition:filter .1s ease,transform .08s ease}.btn:not(:disabled):active{transform:scale(.97)}.btn-primary{background:var(--accent);color:#fff}.btn-primary:disabled{background:var(--border);color:var(--text-muted)}.btn-primary:not(:disabled):hover{background:var(--accent-strong)}.btn-ghost{background:transparent;border:1px solid var(--border)}.btn-danger{background:var(--danger);color:#fff}.btn-small{padding:.35rem .7rem;font-size:.85rem}.btn-icon{font-size:1.1rem;padding:.4rem;color:var(--text-muted)}.view-lesson{gap:.75rem}.lesson-topbar{display:flex;align-items:center;gap:.6rem;position:sticky;top:0;z-index:5;background:var(--bg);padding:.5rem 0}.progress-bar{flex:1;height:12px;border-radius:999px;background:var(--ring-track);overflow:hidden}.progress-fill{height:100%;width:0;border-radius:inherit;background:var(--accent);transition:width .25s ease}.progress-level{height:10px;margin:.4rem 0}.lesson-card-host{display:flex;flex-direction:column}.concept-card,.exercise,.lesson-complete{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:var(--space);box-shadow:var(--shadow);display:flex;flex-direction:column;gap:.75rem}.concept-body h2{margin:0 0 .5rem;font-size:1.15rem}.concept-body h3{margin:.75rem 0 .25rem;font-size:1rem}.concept-body p{margin:.5rem 0}.concept-body code,.exercise-prompt code{font-family:var(--font-mono);font-size:.88em;background:var(--surface-2);padding:.1em .35em;border-radius:5px}.concept-body pre,.exercise-code{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-small);padding:.75rem;overflow-x:auto;font-family:var(--font-mono);font-size:.82rem;line-height:1.5;margin:.5rem 0}.concept-body pre code,.exercise-code code{background:none;padding:0}.concept-media{max-width:100%;border-radius:var(--radius-small)}.exercise-type-label{align-self:flex-start;font-size:.7rem;font-weight:800;text-transform:uppercase;letter-spacing:.07em;color:var(--accent);background:color-mix(in srgb,var(--accent) 14%,transparent);padding:.2rem .55rem;border-radius:999px}.exercise-prompt{margin:0;font-weight:600;font-size:1.02rem;white-space:pre-line}.options{display:flex;flex-direction:column;gap:.5rem}.options-row{flex-direction:row;flex-wrap:wrap}.options-hint{margin:0;font-size:.8rem;color:var(--text-muted)}.option-btn{text-align:left;padding:.65rem .85rem;border-radius:var(--radius-small);border:1.5px solid var(--border);background:var(--surface-2);transition:border-color .1s ease}.option-btn.is-selected{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 12%,var(--surface-2))}.option-btn.is-solution{border-color:var(--success);background:color-mix(in srgb,var(--success) 14%,var(--surface-2))}.option-btn.is-wrong-pick{border-color:var(--danger);background:color-mix(in srgb,var(--danger) 12%,var(--surface-2))}.options-tf{flex-direction:row}.option-tf{flex:1;text-align:center;font-weight:700}.text-input{width:100%;padding:.65rem .85rem;border-radius:var(--radius-small);border:1.5px solid var(--border);background:var(--surface-2);color:var(--text);font:inherit}.text-input:focus{outline:none;border-color:var(--accent)}.text-input.is-solution{border-color:var(--success)}.text-input.is-wrong-pick{border-color:var(--danger)}.text-solution{margin:.4rem 0 0;font-size:.85rem;color:var(--text-muted)}.reorder,.match,.text-exercise{display:flex;flex-direction:column;gap:.5rem}.reorder-picked{margin:0;padding-left:1.4rem;display:flex;flex-direction:column;gap:.3rem;min-height:1rem}.reorder-picked li{background:color-mix(in srgb,var(--accent) 10%,var(--surface-2));border-radius:var(--radius-small);padding:.4rem .6rem}.reorder-pool{display:flex;flex-direction:column;gap:.5rem}.reorder-solution ol{margin:.25rem 0 0;padding-left:1.4rem}.match-row{display:flex;align-items:center;gap:.6rem}.match-left{flex:1;font-weight:600;min-width:0}.match-select{flex:1.4;padding:.5rem;border-radius:var(--radius-small);border:1.5px solid var(--border);background:var(--surface-2);color:var(--text);font:inherit;min-width:0}.match-select.is-solution{border-color:var(--success)}.match-select.is-wrong-pick{border-color:var(--danger)}.match-solution ul{margin:.25rem 0 0;padding-left:1.2rem}.is-locked{pointer-events:none}.exercise-feedback{border-radius:var(--radius-small);padding:.75rem}.exercise-feedback.is-correct{background:color-mix(in srgb,var(--success) 14%,var(--surface-2));border:1px solid var(--success)}.exercise-feedback.is-wrong{background:color-mix(in srgb,var(--danger) 10%,var(--surface-2));border:1px solid var(--danger)}.feedback-title{margin:0 0 .3rem;font-weight:800}.feedback-explanation{margin:0;font-size:.92rem}.exercise-actions{display:flex;justify-content:flex-end}.exercise-actions .btn{min-width:9rem}.lesson-complete{align-items:center;text-align:center;padding:2rem var(--space)}.complete-emoji{font-size:3rem}.complete-title{margin:0}.complete-stats{display:flex;gap:1rem;flex-wrap:wrap;justify-content:center}.complete-stat{background:var(--surface-2);border-radius:var(--radius-small);padding:.5rem .9rem;font-size:.9rem}.complete-note,.complete-badge{margin:0;font-weight:600}.complete-badge{color:var(--warning)}.complete-actions{display:flex;flex-direction:column;gap:.5rem;width:100%;max-width:320px;margin-top:.5rem}@media(min-width:480px){.stats-grid{grid-template-columns:repeat(6,1fr)}.badge-grid{grid-template-columns:repeat(3,1fr)}}