@import "https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@400;500;600;700;800&family=Noto+Serif+SC:wght@600;700;900&display=swap";:root{color:#2c241d;font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;--ink:#2c241d;--muted:#756b60;--paper:#fffcf6;--red:#b94135;--red-dark:#913128;--green:#37725c;--line:#e7ddcf;--yellow:#f4c85c;background:#f8f3e9;font-family:Be Vietnam Pro,system-ui,sans-serif}*{box-sizing:border-box}html{background:#f8f3e9;min-width:320px}body{background:radial-gradient(circle at 5% 10%,#f4c85c2e,#0000 28rem),radial-gradient(circle at 95% 35%,#b9413517,#0000 30rem),#f8f3e9;min-width:320px;min-height:100vh;margin:0}button,a{font:inherit}button{-webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible{outline-offset:3px;outline:3px solid #37725c59}#root{min-height:100vh}.app-shell{width:min(1120px,100% - 40px);margin:0 auto}.site-header{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;min-height:92px;display:flex}.brand{color:var(--ink);align-items:center;gap:12px;text-decoration:none;display:inline-flex}.brand-mark{color:#fffaf0;background:var(--red);border-radius:15px 15px 15px 5px;place-items:center;width:48px;height:48px;font:700 28px/1 Noto Serif SC,serif;display:grid;box-shadow:0 8px 20px #91312833}.brand strong,.brand small{display:block}.brand strong{letter-spacing:-.02em;font-size:17px}.brand small{color:var(--muted);margin-top:2px;font-size:11px}.free-badge{color:var(--green);background:#edf6f1;border:1px solid #cbded5;border-radius:999px;padding:7px 12px;font-size:12px;font-weight:700}.hero-copy{grid-template-columns:minmax(0,1fr) auto;align-items:end;gap:40px;padding:42px 0 26px;display:grid}.eyebrow{color:var(--red);letter-spacing:.12em;text-transform:uppercase;margin:0 0 8px;font-size:12px;font-weight:800}h1{letter-spacing:-.045em;max-width:680px;margin:0;font-size:clamp(32px,5vw,54px);line-height:1.08}.intro{max-width:580px;color:var(--muted);margin:14px 0 0;font-size:15px;line-height:1.7}.progress-wrap{min-width:210px;padding-bottom:5px}.language-switch{border:1px solid var(--line);background:#fffcf6cc;border-radius:12px;gap:4px;margin-bottom:15px;padding:4px;display:flex}.language-switch button{min-height:30px;color:var(--muted);cursor:pointer;background:0 0;border:0;border-radius:8px;flex:1;padding:5px 8px;font-size:10px;font-weight:800}.language-switch button.active{color:#fff;background:var(--green)}.progress-label{color:var(--muted);justify-content:space-between;margin-bottom:9px;font-size:11px;font-weight:700;display:flex}.progress-track{background:#e8dfd2;border-radius:999px;height:8px;overflow:hidden}.progress-bar{border-radius:inherit;background:var(--green);height:100%;transition:width .35s}.lesson-nav{scrollbar-width:none;gap:8px;padding:0 0 18px;display:flex;overflow-x:auto}.lesson-nav::-webkit-scrollbar{display:none}.lesson-pill{border:1px solid var(--line);min-height:40px;color:var(--muted);cursor:pointer;background:#fffcf6b3;border-radius:999px;flex:none;align-items:center;gap:8px;padding:7px 13px 7px 8px;transition:all .18s;display:inline-flex}.lesson-pill:hover{border-color:#c9bbab;transform:translateY(-1px)}.lesson-pill.active{border-color:var(--ink);color:var(--ink);background:#fffaf0;box-shadow:0 7px 20px #47362514}.pill-char{color:#fffaf0;background:#817568;border-radius:50%;place-items:center;width:27px;height:27px;font:700 16px Noto Serif SC,serif;display:grid}.lesson-pill.active .pill-char{background:var(--red)}.lesson-pill strong{font-size:12px}.game-grid{grid-template-columns:minmax(300px,.82fr) minmax(420px,1.18fr);gap:18px;display:grid}.panel{border:1px solid var(--line);background:#fffcf6e8;border-radius:24px;box-shadow:0 18px 50px #4b3a2812}.character-card{text-align:center;flex-direction:column;justify-content:center;align-items:center;min-height:480px;padding:38px 34px;display:flex;position:relative;overflow:hidden}.character-card:before,.character-card:after{content:"";background:#eee5da;width:230px;height:1px;position:absolute;transform:rotate(45deg)}.character-card:after{transform:rotate(-45deg)}.card-label{color:var(--muted);letter-spacing:.08em;text-transform:uppercase;margin:0;font-size:11px;font-weight:700;position:absolute;top:24px;left:24px}.han-character{z-index:1;color:var(--ink);text-shadow:3px 4px #b941351c;margin:6px 0 8px;font:900 clamp(104px,14vw,154px)/1 Noto Serif SC,serif;position:relative}.pinyin{z-index:1;color:var(--red);margin:0;font-size:23px;font-weight:800;position:relative}.meaning{z-index:1;margin:8px 0 0;font-size:16px;font-weight:700;position:relative}.hanviet{color:var(--muted);letter-spacing:.06em;margin-left:6px;font-size:11px;font-weight:600}.audio-button{z-index:1;color:var(--ink);cursor:pointer;background:#fffaf0;border:1px solid #ddcfc0;border-radius:999px;align-items:center;gap:8px;margin-top:22px;padding:10px 15px;font-size:12px;font-weight:700;transition:all .18s;display:inline-flex;position:relative}.audio-button:hover{border-color:var(--red);color:var(--red)}.audio-button.playing{color:#fff;border-color:var(--green);background:var(--green)}.audio-button svg{width:17px;height:17px}.audio-credit{z-index:1;color:var(--muted);text-underline-offset:2px;margin-top:8px;font-size:9px;line-height:1.4;text-decoration:underline;display:block;position:relative}.story-card{z-index:1;color:#625749;text-align:left;background:#f4ede2;border-radius:14px;width:100%;margin-top:28px;padding:15px 17px;font-size:12px;line-height:1.65;position:relative}.story-card strong{color:var(--ink);margin-bottom:3px;font-size:11px;display:block}.game-panel{min-height:480px;padding:32px}.step-row{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:20px;padding-bottom:22px;display:flex}.step-number{color:#fff;background:var(--red);border-radius:9px;place-items:center;width:30px;height:30px;margin-right:9px;font-size:12px;font-weight:800;display:inline-grid}.step-row h2{letter-spacing:-.02em;margin:0;font-size:18px;display:inline}.score{color:var(--green);white-space:nowrap;font-size:12px;font-weight:800}.equation{justify-content:center;align-items:center;gap:clamp(12px,3vw,24px);min-height:126px;display:flex}.equation-char,.equation-result{border-radius:18px;place-items:center;width:72px;height:72px;font:800 47px/1 Noto Serif SC,serif;display:grid}.equation-char{color:var(--ink);background:#f1e9dd}.equation-result{color:#fffaf0;background:var(--red);animation:.26s ease-out pop}.equation-placeholder{color:#b3a696;background:#fbf7ef;border:2px dashed #d7c9b9;border-radius:18px;place-items:center;width:72px;height:72px;font-size:26px;display:grid}.operator{color:#a49687;font-size:25px;font-weight:500}@keyframes pop{0%{opacity:0;transform:scale(.7)}70%{transform:scale(1.08)}to{opacity:1;transform:scale(1)}}.instruction{color:var(--muted);margin:0 0 13px;font-size:12px;font-weight:600}.component-options{grid-template-columns:repeat(3,1fr);gap:10px;display:grid}.component-button{border:1px solid var(--line);min-height:86px;color:var(--ink);cursor:pointer;background:#fffaf1;border-radius:15px;flex-direction:column;justify-content:center;align-items:center;gap:4px;transition:all .18s;display:flex}.component-button:hover:not(:disabled){border-color:var(--red);transform:translateY(-2px);box-shadow:0 9px 20px #513a2314}.component-button:disabled{cursor:default}.component-button.selected{border-color:var(--green);color:var(--green);background:#edf6f1}.component-button.wrong{color:var(--red);background:#fff1ef;border-color:#d9a39d;animation:.26s shake}.component-symbol{font:700 29px/1 Noto Serif SC,serif}.component-name{color:var(--muted);font-size:10px;font-weight:600}@keyframes shake{0%,to{transform:translate(0)}33%{transform:translate(-4px)}66%{transform:translate(4px)}}.feedback{background:#f4ede2;border-radius:15px;min-height:78px;margin-top:16px;padding:14px 16px}.feedback.success{color:#285c49;background:#e8f2ed}.feedback.error{color:#913128;background:#fff0ed}.feedback strong{margin-bottom:4px;font-size:13px;display:block}.feedback p{margin:0;font-size:11px;line-height:1.55}.feedback .audio-button{margin-top:10px;padding:7px 11px;font-size:10px}.feedback .audio-credit{margin-left:8px;display:inline-block}.game-actions{justify-content:space-between;gap:10px;margin-top:18px;display:flex}.nav-button{border:1px solid var(--line);min-height:42px;color:var(--ink);cursor:pointer;background:0 0;border-radius:12px;padding:9px 16px;font-size:11px;font-weight:800}.nav-button.primary{border-color:var(--ink);color:#fff;background:var(--ink);margin-left:auto}.nav-button:disabled{opacity:.35;cursor:default}footer{color:#938679;text-align:center;padding:28px 0 34px;font-size:11px}@media (width<=800px){.app-shell{width:min(100% - 24px,620px)}.site-header{min-height:76px}.brand-mark{width:41px;height:41px;font-size:24px}.hero-copy{grid-template-columns:1fr;gap:22px;padding-top:30px}.progress-wrap{min-width:0}.game-grid{grid-template-columns:1fr}.character-card,.game-panel{min-height:auto}.character-card{padding:58px 24px 25px}.han-character{font-size:112px}.game-panel{padding:24px 18px}}@media (width<=420px){.brand small{display:none}.component-options{gap:7px}.component-button{min-height:78px}.equation-char,.equation-result,.equation-placeholder{width:64px;height:64px}}