:root{--ink:#172033;--muted:#667085;--paper:#fffaf3;--line:#eadfd4;--accent:#d95336;--accent-dark:#923622;--blue:#315fa8;--soft:#fff0e8;--green:#1f7654;--shadow:0 12px 38px rgba(70,45,20,.08)}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,sans-serif;line-height:1.65}.skip-link{position:absolute;left:-9999px}.skip-link:focus{left:12px;top:12px;background:#fff;padding:10px;z-index:10}.site-header{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:18px max(20px,calc((100% - 1040px)/2));border-bottom:1px solid var(--line);background:rgba(255,250,243,.94);position:sticky;top:0;z-index:5}.brand{font-weight:900;color:var(--ink);text-decoration:none}.site-header nav{display:flex;gap:18px}.site-header nav a{color:var(--blue);font-weight:750}.page-shell{max-width:980px;margin:auto;padding:54px 20px 90px}.site-footer{padding:25px;text-align:center;border-top:1px solid var(--line);color:var(--muted)}h1{font-size:clamp(2.4rem,7vw,4.8rem);line-height:1;margin:.3em 0}h2{margin-top:2.2em;font-size:1.75rem}h3{margin-top:1.7em}a{color:var(--blue)}.eyebrow{color:var(--accent-dark);text-transform:uppercase;letter-spacing:.12em;font-weight:850;font-size:.78rem}.lead{font-size:1.12rem;color:var(--muted);max-width:720px}.hero{padding:40px 0 65px}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}.actions a{padding:12px 16px;border:1px solid var(--line);border-radius:12px;background:#fff;font-weight:800;text-decoration:none}.actions .primary{background:var(--accent);color:#fff;border-color:var(--accent)}.level-card{display:flex;align-items:center;gap:18px;padding:22px;background:#fff;border:1px solid var(--line);border-radius:18px;text-decoration:none;color:var(--ink);box-shadow:var(--shadow)}.level-mark{display:grid;place-items:center;width:68px;height:68px;border-radius:16px;background:var(--soft);color:var(--accent-dark);font-size:1.5rem;font-weight:900}.level-card strong,.level-card small{display:block}.level-card small{color:var(--muted);margin-top:4px}.page-heading,.lesson-header{padding-bottom:26px;border-bottom:1px solid var(--line)}.breadcrumbs{color:var(--muted);font-size:.9rem;margin-bottom:28px}.title-tools{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:15px 16px;background:var(--soft);border-radius:15px;max-width:760px}.pronunciation{color:var(--accent-dark)}.audio-button{display:inline-flex;align-items:center;gap:7px;border:0;border-radius:999px;background:var(--accent);color:#fff;padding:10px 13px;font-weight:800;cursor:pointer;white-space:nowrap}.audio-button:hover{filter:brightness(.94)}.audio-button:focus-visible,summary:focus-visible,a:focus-visible{outline:3px solid var(--ink);outline-offset:3px}.audio-button.loading{opacity:.65}.lesson-content{max-width:760px}.lesson-content table{width:100%;border-collapse:collapse}.lesson-content th,.lesson-content td{padding:11px;border-bottom:1px solid var(--line);text-align:left}.callout{padding:18px 20px;border:1px solid var(--line);border-left:5px solid var(--blue);background:#fff;border-radius:14px;margin:20px 0}.callout.warning{border-left-color:var(--accent)}.callout.practice{border-left-color:var(--green)}.answer{border:1px solid var(--line);border-radius:13px;background:#fff;margin:14px 0;padding:14px 16px}.answer summary{font-weight:850;cursor:pointer}.answer div{padding-top:10px}.status{display:inline-block;padding:6px 10px;border-radius:999px;background:#f0f1f3;color:#475467;font-size:.82rem;font-weight:800}.status.mastered{background:#eaf7f0;color:#176443}.status.in-progress{background:#fff0e8;color:#923622}.status.needs-review{background:#fff7d6;color:#755b00}.lesson-list{padding:0;list-style:none}.lesson-list li{margin:14px 0}.lesson-list a{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:16px;text-decoration:none;color:var(--ink);box-shadow:var(--shadow)}.lesson-list small,.lesson-list strong,.lesson-list span span{display:block}.lesson-list small{color:var(--accent-dark);font-weight:850}.lesson-list strong{font-size:1.15rem;margin:3px 0}.lesson-list span span{color:var(--muted)}.lesson-nav{display:flex;justify-content:space-between;gap:20px;margin-top:50px;padding-top:20px;border-top:1px solid var(--line)}@media(max-width:650px){.site-header{position:static}.page-shell{padding-top:34px}.title-tools,.lesson-list a{align-items:flex-start;flex-direction:column}.audio-button span{display:none}}