:root{--paper:#fbfbf8;--surface:#ffffff;--surface-soft:#f4f4ef;--ink:#1f2328;--ink-secondary:#57606c;--ink-muted:#8a94a1;--line:#e5e5de;--line-strong:#d4d4cb;--accent:#343599;--accent-ink:#2a2b7a;--accent-soft:#ececf6;--accent-tint:#f4f4fb;--green:#1d7a4f;--green-soft:#e3f3ea;--red:#b3372f;--red-soft:#fbe7e5;--amber:#9a6a1b;--amber-soft:#faf1de;--font-sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;--font-display:"Source Serif 4",Georgia,"Times New Roman",serif;--radius-sm:8px;--radius-md:12px;--radius-lg:18px;--shadow-sm:0 1px 2px rgba(31,35,40,0.05);--shadow-md:0 2px 8px rgba(31,35,40,0.07),0 8px 24px rgba(31,35,40,0.05);--transition:160ms ease}*{box-sizing:border-box;margin:0;padding:0}html{height:100%}body{background:var(--paper);color:var(--ink);font-family:var(--font-sans);font-size:16px;line-height:1.6;min-height:100vh;-webkit-font-smoothing:antialiased}button{font-family:inherit;cursor:pointer;border:none;background:none;font-size:inherit}a,button{color:inherit}a{text-decoration:none}:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}::selection{background:var(--accent-soft)}h1,h2,h3{font-family:var(--font-display);font-weight:600;letter-spacing:-.01em;line-height:1.25}.container{max-width:1040px;margin:0 auto;padding:0 24px}.page{min-height:100vh;display:flex;flex-direction:column}.navbar{border-bottom:1px solid var(--line);background:rgba(251,251,248,.92);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);position:-webkit-sticky;position:sticky;top:0;z-index:40}.navbar-inner{justify-content:space-between;gap:16px;min-height:64px;flex-wrap:wrap;padding-top:8px;padding-bottom:8px}.navbar-brand,.navbar-inner{display:flex;align-items:center}.navbar-brand{gap:10px}.brand-mark{width:34px;height:34px;border-radius:9px;background:var(--accent);color:#fff;font-size:1.15rem;display:flex;align-items:center;justify-content:center}.brand-mark,.brand-name{font-family:var(--font-display);font-weight:700}.brand-name{font-size:1.2rem;letter-spacing:-.01em}.navbar-controls{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.stat-chip{display:inline-flex;align-items:center;gap:6px;font-size:.84rem;font-weight:600;color:var(--ink-secondary);background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:5px 12px;white-space:nowrap}.stat-chip svg{flex-shrink:0}.select-wrap{display:inline-flex;align-items:center;gap:7px;font-size:.84rem;font-weight:600;color:var(--ink-secondary)}.select-wrap select{-moz-appearance:none;appearance:none;-webkit-appearance:none;background:var(--surface) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%2357606c' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E") no-repeat right 12px center;border:1px solid var(--line-strong);border-radius:var(--radius-sm);color:var(--ink);font-family:inherit;font-size:.86rem;font-weight:600;padding:6px 30px 6px 12px;cursor:pointer;transition:border-color var(--transition)}.select-wrap select:hover{border-color:var(--ink-muted)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:10px;font-weight:600;font-size:.95rem;padding:11px 22px;transition:background var(--transition),border-color var(--transition),transform var(--transition),box-shadow var(--transition);border:1px solid transparent;line-height:1.2}.btn:active{transform:translateY(1px)}.btn-primary{background:var(--accent);color:#fff;box-shadow:var(--shadow-sm)}.btn-primary:hover{background:var(--accent-ink)}.btn-primary:disabled{opacity:.45;cursor:not-allowed;transform:none}.btn-secondary{background:var(--surface);border-color:var(--line-strong);color:var(--ink)}.btn-secondary:hover{border-color:var(--ink-muted)}.btn-audio{display:inline-flex;align-items:center;gap:8px;background:var(--accent-tint);border:1px solid var(--accent-soft);color:var(--accent-ink);font-weight:600;font-size:.98rem;padding:11px 24px;border-radius:999px;transition:background var(--transition),border-color var(--transition)}.btn-audio:hover{background:var(--accent-soft);border-color:var(--accent)}.icon-btn{display:inline-flex;align-items:center;justify-content:center;width:42px;height:42px;border-radius:50%;background:var(--accent-tint);color:var(--accent-ink);border:1px solid var(--accent-soft);transition:background var(--transition)}.icon-btn:hover{background:var(--accent-soft)}.hero{padding:56px 0 40px;display:flex;align-items:flex-end;justify-content:space-between;gap:32px;flex-wrap:wrap}.eyebrow{display:inline-flex;align-items:center;gap:7px;font-size:.76rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--accent-ink);background:var(--accent-tint);border:1px solid var(--accent-soft);border-radius:999px;padding:5px 14px;margin-bottom:20px}.hero h1{font-size:clamp(2rem,4.6vw,2.9rem);max-width:560px;margin-bottom:14px}.hero-sub{color:var(--ink-secondary);font-size:1.06rem;max-width:520px}.hero-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);padding:26px 30px;min-width:250px}.hero-card .label{font-size:.74rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-muted)}.hero-card .value{font-family:var(--font-display);font-size:2.3rem;font-weight:700;color:var(--accent-ink);margin:6px 0 2px}.progress-track{height:6px;background:var(--surface-soft);border-radius:999px;overflow:hidden}.progress-fill{height:100%;background:var(--accent);border-radius:999px;transition:width .4s ease}.stats-row{display:grid;grid-template-columns:repeat(4,1fr);grid-gap:14px;gap:14px;margin-bottom:56px}.stat-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-md);padding:16px 18px;box-shadow:var(--shadow-sm)}.stat-card .stat-value{font-family:var(--font-display);font-size:1.55rem;font-weight:700}.stat-card .stat-label{font-size:.8rem;color:var(--ink-muted);font-weight:500}.section-heading{margin-bottom:24px}.section-heading h2{font-size:1.55rem}.section-heading p{color:var(--ink-secondary);max-width:620px;margin-top:4px}.level-group{margin-bottom:40px}.level-label{display:inline-flex;align-items:center;gap:8px;font-size:.78rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-muted);border-bottom:1px solid var(--line-strong);padding-bottom:6px;margin-bottom:16px;width:100%}.units-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));grid-gap:14px;gap:14px}.unit-card{display:flex;flex-direction:column;gap:10px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-md);padding:18px;box-shadow:var(--shadow-sm);transition:border-color var(--transition),box-shadow var(--transition),transform var(--transition)}.unit-card:hover:not(.unit-card-locked){border-color:var(--accent);box-shadow:var(--shadow-md);transform:translateY(-2px)}.unit-card-locked{opacity:.62;cursor:not-allowed}.unit-card-top{justify-content:space-between;gap:8px}.unit-card-top,.unit-emoji{display:flex;align-items:center}.unit-emoji{width:46px;height:46px;border-radius:var(--radius-md);justify-content:center;font-size:1.5rem}.unit-number{font-size:.74rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-muted)}.unit-card h3{font-size:1.08rem}.unit-meta{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:auto;font-size:.82rem;color:var(--ink-secondary)}.unit-progress-bar{height:4px;background:var(--surface-soft);border-radius:999px;overflow:hidden}.unit-progress-bar .fill{height:100%;background:var(--green);transition:width .3s ease}.done-badge{display:inline-flex;align-items:center;gap:5px;color:var(--green);font-weight:600;font-size:.8rem}.page-header{padding:40px 0 28px}.back-link{display:inline-flex;align-items:center;gap:6px;font-size:.88rem;font-weight:600;color:var(--ink-secondary);margin-bottom:18px;transition:color var(--transition)}.back-link:hover{color:var(--accent-ink)}.page-header h1{font-size:clamp(1.7rem,3.4vw,2.3rem);margin-bottom:6px;display:flex;align-items:center;gap:14px}.page-header .kicker{font-family:var(--font-sans);font-size:.78rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-muted)}.goal-note{color:var(--ink-secondary);max-width:640px}.lessons-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(215px,1fr));grid-gap:12px;gap:12px;padding-bottom:64px}.lesson-card{display:flex;flex-direction:column;gap:8px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-md);padding:16px;transition:border-color var(--transition),box-shadow var(--transition)}.lesson-card:hover:not(.lesson-card-locked){border-color:var(--accent);box-shadow:var(--shadow-md)}.lesson-card-locked{opacity:.55;cursor:not-allowed}.lesson-card-top{display:flex;align-items:center;justify-content:space-between;font-size:.78rem;color:var(--ink-muted);font-weight:600}.lesson-card h3{font-family:var(--font-sans);font-size:.98rem;font-weight:600}.lesson-words{font-size:.85rem;color:var(--ink-secondary)}.lesson-card-bottom{display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:4px}.type-tag{font-size:.74rem;font-weight:600;color:var(--accent-ink);background:var(--accent-tint);border-radius:999px;padding:3px 10px}.lesson-play{width:30px;height:30px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;flex-shrink:0}.lesson-play.done{background:var(--green)}.lock-icon{color:var(--ink-muted)}.vocab-strip{display:flex;flex-wrap:wrap;gap:10px;margin:8px 0 36px}.vocab-pill{display:inline-flex;align-items:center;gap:8px;background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:7px 14px 7px 9px;font-size:.9rem;font-weight:500}.vocab-pill .emoji-dot{width:26px;height:26px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.95rem}.lesson-shell{min-height:100vh;display:flex;flex-direction:column}.lesson-topbar{border-bottom:1px solid var(--line);background:var(--surface)}.lesson-topbar-inner{display:flex;align-items:center;gap:20px;min-height:60px}.lesson-exit{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:50%;color:var(--ink-secondary);transition:background var(--transition);flex-shrink:0}.lesson-exit:hover,.lesson-topbar .bar{background:var(--surface-soft)}.lesson-topbar .bar{flex:1 1;height:6px;border-radius:999px;overflow:hidden}.lesson-topbar .bar .fill{height:100%;background:var(--accent);border-radius:999px;transition:width .3s ease}.lesson-topbar .count{font-size:.88rem;font-weight:600;color:var(--ink-secondary);white-space:nowrap}.exercise-stage{flex:1 1;display:flex;align-items:flex-start;justify-content:center;padding:48px 24px 72px}.exercise-box{width:100%;max-width:720px;display:flex;flex-direction:column;align-items:center;gap:28px}.exercise-prompt{text-align:center;color:var(--ink-secondary);font-size:1rem;font-weight:500}.options-grid-3{grid-template-columns:repeat(3,1fr);grid-gap:14px}.options-grid-3,.options-grid-4{display:grid;gap:14px;width:100%}.options-grid-4{grid-template-columns:repeat(2,1fr);grid-gap:14px;max-width:620px}.option-tile{border:1.5px solid var(--line);border-radius:var(--radius-lg);background:var(--surface);overflow:hidden;transition:border-color var(--transition),transform var(--transition),box-shadow var(--transition);box-shadow:var(--shadow-sm);text-align:inherit;padding:0;display:block;width:100%}button.option-tile:not(:disabled):hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:var(--shadow-md)}.option-tile.state-correct{border-color:var(--green);box-shadow:0 0 0 3px var(--green-soft)}.option-tile.state-wrong{border-color:var(--red);box-shadow:0 0 0 3px var(--red-soft)}.option-tile.state-dim{opacity:.55}.tile-art{aspect-ratio:4/3;justify-content:center;font-size:clamp(2.6rem,8vw,4rem)}.tile-art,.tile-label{display:flex;align-items:center}.tile-label{justify-content:space-between;gap:8px;padding:11px 14px;border-top:1px solid var(--line);font-weight:600;font-size:.95rem}.speak-card{display:flex;flex-direction:column;align-items:center;gap:20px;text-align:center}.target-word{font-family:var(--font-display);font-size:clamp(2rem,6vw,2.8rem);font-weight:700}.mic-btn{width:84px;height:84px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-md);transition:transform var(--transition),background var(--transition)}.mic-btn:hover{background:var(--accent-ink)}.mic-btn.listening{background:var(--red);animation:micPulse 1.4s ease-in-out infinite}@keyframes micPulse{0%,to{box-shadow:0 0 0 0 rgba(179,55,47,.35)}50%{box-shadow:0 0 0 14px rgba(179,55,47,0)}}.heard-chip{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-md);padding:12px 20px;box-shadow:var(--shadow-sm)}.heard-chip .heard-label{font-size:.74rem;text-transform:uppercase;letter-spacing:.06em;color:var(--ink-muted);font-weight:600}.heard-chip .heard-text{font-size:1.15rem;font-weight:600;color:var(--accent-ink)}.feedback-line{display:inline-flex;align-items:center;gap:8px;font-weight:600;border-radius:999px;padding:8px 16px;font-size:.92rem}.feedback-line.ok{background:var(--green-soft);color:var(--green)}.feedback-line.err{background:var(--amber-soft);color:var(--amber)}.feedback-line.bad{background:var(--red-soft);color:var(--red)}.write-form{width:100%;max-width:460px;display:flex;flex-direction:column;gap:14px}.write-input{width:100%;padding:14px 18px;background:var(--surface);border:1.5px solid var(--line-strong);border-radius:var(--radius-md);color:var(--ink);font-family:inherit;font-size:1.2rem;text-align:center;outline:none;transition:border-color var(--transition),box-shadow var(--transition)}.write-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.write-input.state-correct{border-color:var(--green);box-shadow:0 0 0 3px var(--green-soft)}.write-input.state-wrong{border-color:var(--red);box-shadow:0 0 0 3px var(--red-soft)}.write-input:disabled{background:var(--surface-soft)}.completion-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);padding:44px 36px;text-align:center;max-width:480px;width:100%;display:flex;flex-direction:column;align-items:center;gap:14px}.completion-badge{width:76px;height:76px;border-radius:50%;background:var(--green-soft);color:var(--green);display:flex;align-items:center;justify-content:center}.completion-card h2{font-size:1.8rem}.completion-card .muted{color:var(--ink-secondary)}.completion-actions{gap:12px;flex-wrap:wrap;margin-top:8px}.completion-actions,.notfound{display:flex;justify-content:center}.notfound{flex:1 1;align-items:center;padding:48px 24px;text-align:center}.notfound-card{max-width:460px;display:flex;flex-direction:column;align-items:center;gap:14px}.notfound-card .code{font-family:var(--font-display);font-size:4.2rem;font-weight:700;color:var(--line-strong);line-height:1}.footer{border-top:1px solid var(--line);padding:20px 0;color:var(--ink-muted);font-size:.82rem;text-align:center}.loading-state{min-height:60vh;display:flex;align-items:center;justify-content:center;color:var(--ink-muted)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media (max-width:720px){.hero{padding:36px 0 28px}.options-grid-3,.stats-row{grid-template-columns:repeat(2,1fr)}.options-grid-3 .option-tile:last-child{grid-column:1/-1}.container{padding:0 18px}}@media (prefers-reduced-motion:reduce){*,:after,:before{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}