:root{--paper: #f1ece0;--paper-dim: #e7dfcd;--ink: #23291f;--ink-soft: #565c4e;--rust: #c9622a;--rust-dark: #a54e1f;--moss: #4c6b4f;--moss-dark: #384f3b;--stone: #b9af9a;--stone-line: #d9d1bd;--white: #fffdf8;--error: #b3423a;--font-display: "Fraunces", serif;--font-body: "Work Sans", sans-serif;--font-mono: "JetBrains Mono", monospace}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font-body);-webkit-font-smoothing:antialiased}body:before{content:"";position:fixed;top:0;right:0;bottom:0;left:0;pointer-events:none;background-image:radial-gradient(var(--stone-line) 1px,transparent 1px);background-size:22px 22px;opacity:.35;z-index:0}#root{position:relative;z-index:1;min-height:100vh}button{font-family:var(--font-body);cursor:pointer}button:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--rust);outline-offset:2px}.app-shell{max-width:640px;margin:0 auto;padding:24px 20px 80px}.header{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:28px}.wordmark{font-family:var(--font-display);font-weight:600;font-size:1.5rem;letter-spacing:-.01em}.wordmark span{color:var(--rust)}.stat-strip{display:flex;gap:14px;font-family:var(--font-mono);font-size:.8rem;color:var(--ink-soft)}.stat-strip strong{color:var(--ink);font-weight:500}.trail-wrap{position:relative}.trail-svg-path{stroke:var(--stone);stroke-width:3;stroke-dasharray:2 10;stroke-linecap:round;fill:none}.unit-node-group{cursor:pointer}.unit-node-group[data-locked=true]{cursor:not-allowed}.unit-node{fill:var(--white);stroke:var(--stone);stroke-width:3;transition:transform .15s ease}.unit-node-group[data-active=true] .unit-node{fill:var(--rust);stroke:var(--rust-dark)}.unit-node-group[data-complete=true] .unit-node{fill:var(--moss);stroke:var(--moss-dark)}.unit-node-group:not([data-locked=true]):hover .unit-node{transform:scale(1.06)}.unit-label{font-family:var(--font-mono);font-size:11px;fill:var(--ink-soft)}.unit-icon{font-family:var(--font-display);font-weight:600;fill:var(--ink)}.unit-node-group[data-active=true] .unit-icon,.unit-node-group[data-complete=true] .unit-icon{fill:var(--white)}.unit-card{background:var(--white);border:1.5px solid var(--stone-line);border-radius:4px;padding:20px;margin-top:24px}.unit-card h2{font-family:var(--font-display);font-size:1.3rem;margin:0 0 2px}.unit-card .de-title{font-family:var(--font-mono);font-size:.8rem;color:var(--rust);margin-bottom:10px}.unit-card p{color:var(--ink-soft);font-size:.92rem;line-height:1.5;margin:0 0 16px}.btn-primary{background:var(--rust);color:var(--white);border:none;padding:12px 22px;border-radius:3px;font-weight:500;font-size:.95rem;letter-spacing:.01em}.btn-primary:hover{background:var(--rust-dark)}.btn-primary:disabled{background:var(--stone);cursor:not-allowed}.btn-secondary{background:transparent;color:var(--ink-soft);border:1.5px solid var(--stone-line);padding:11px 20px;border-radius:3px;font-size:.9rem}.lesson-shell{padding-top:6px}.lesson-progress{height:6px;background:var(--stone-line);border-radius:3px;overflow:hidden;margin-bottom:4px}.lesson-progress-fill{height:100%;background:var(--rust);transition:width .3s ease}.hearts-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px;font-family:var(--font-mono);font-size:.85rem;color:var(--ink-soft)}.exercise-card{background:var(--white);border:1.5px solid var(--stone-line);border-radius:4px;padding:28px 22px;min-height:220px}.exercise-eyebrow{font-family:var(--font-mono);font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:var(--rust);margin-bottom:10px}.exercise-prompt{font-family:var(--font-display);font-size:1.35rem;line-height:1.4;margin-bottom:20px}.option-list{display:flex;flex-direction:column;gap:10px}.option-btn{text-align:left;background:var(--paper);border:1.5px solid var(--stone-line);border-radius:3px;padding:13px 16px;font-size:.98rem;color:var(--ink)}.option-btn:hover{border-color:var(--rust)}.option-btn[data-selected=true]{border-color:var(--rust);background:#f7e6db}.option-btn[data-correct=true]{border-color:var(--moss);background:#e3ebe0}.option-btn[data-incorrect=true]{border-color:var(--error);background:#f3dcd9}.text-input{width:100%;border:1.5px solid var(--stone-line);border-radius:3px;padding:13px 14px;font-size:1rem;font-family:var(--font-body);background:var(--paper)}.text-input:focus{outline:none;border-color:var(--rust)}.word-bank{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}.word-chip{background:var(--paper);border:1.5px solid var(--stone-line);border-radius:3px;padding:8px 14px;font-size:.95rem}.word-chip[data-used=true]{opacity:.35;cursor:default}.built-sentence{min-height:44px;border-bottom:1.5px solid var(--stone);margin-bottom:18px;display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding-bottom:8px}.feedback-banner{margin-top:18px;padding:12px 16px;border-radius:3px;font-size:.92rem;font-family:var(--font-mono)}.feedback-banner[data-correct=true]{background:#e3ebe0;color:var(--moss-dark)}.feedback-banner[data-correct=false]{background:#f3dcd9;color:var(--error)}.check-row{display:flex;justify-content:flex-end;margin-top:20px;gap:10px}.loading-text{font-family:var(--font-mono);font-size:.85rem;color:var(--ink-soft)}.session-complete{text-align:center;padding:40px 20px}.session-complete h2{font-family:var(--font-display);font-size:1.8rem}.xp-badge{display:inline-block;font-family:var(--font-mono);background:var(--moss);color:var(--white);padding:6px 16px;border-radius:20px;margin-top:10px}