:root{--c-primary: #2E7D32;--c-primary-dark: #1B5E20;--c-secondary: #4CAF50;--c-accent: #81C784;--c-accent-bg: #E8F5E9;--c-warn: #E53935;--c-ink: #263238;--c-ink-soft: #607D8B;--c-paper: #FDFBF7;--c-card: #FFFFFF;--radius: 16px;--radius-sm: 10px;--shadow: 0 2px 12px rgba(46, 125, 50, .12);--shadow-lg: 0 6px 24px rgba(46, 125, 50, .18)}*{box-sizing:border-box}html,body,#root{margin:0;padding:0;min-height:100%}body{font-family:PingFang SC,Hiragino Sans GB,Microsoft YaHei,system-ui,sans-serif;background:var(--c-paper);color:var(--c-ink);-webkit-font-smoothing:antialiased}h1,h2,h3{margin:0}button{font-family:inherit;border:none;cursor:pointer;border-radius:var(--radius-sm);min-height:44px;min-width:44px;font-size:16px;transition:background .15s,transform .1s}button:active{transform:scale(.96)}.btn-primary{background:var(--c-primary);color:#fff;padding:0 20px;font-weight:600}.btn-primary:hover{background:var(--c-primary-dark)}.btn-secondary{background:var(--c-secondary);color:#fff;padding:0 20px;font-weight:600}.btn-secondary:hover{background:var(--c-primary)}.btn-ghost{background:var(--c-accent-bg);color:var(--c-primary-dark);padding:0 16px}.btn-ghost:hover{background:var(--c-accent);color:#fff}.btn-primary,.btn-secondary,.btn-ghost{display:inline-flex;align-items:center;justify-content:center;gap:6px}.btn-primary svg,.btn-secondary svg,.btn-ghost svg{flex-shrink:0}.btn:disabled{opacity:.4;cursor:default}.topbar{display:flex;align-items:center;gap:12px;padding:12px 20px;background:var(--c-primary);color:#fff;box-shadow:var(--shadow);position:sticky;top:0;z-index:10}.topbar .logo{font-size:26px}.topbar h1{font-size:20px;font-weight:700;letter-spacing:1px}.topbar .spacer{flex:1}.topbar button{background:#ffffff29;color:#fff;padding:0 16px}.topbar button:hover{background:#ffffff4d}.ver-badge{background:#ffffff2e;border-radius:999px;padding:2px 10px;font-size:12px;font-weight:600;font-family:ui-monospace,monospace}@media (max-width: 640px){.topbar{padding:8px 12px}.topbar .logo{font-size:20px}.topbar h1{font-size:13px;white-space:nowrap}.topbar button{padding:0 10px;font-size:13px}}.home-wrap{max-width:1200px;margin:0 auto;padding:24px 20px 60px}.home-hero{text-align:center;margin:12px 0 28px}.home-hero h2{font-size:28px;color:var(--c-primary-dark)}.home-hero p{color:var(--c-ink-soft);font-size:16px;margin:8px 0 0}.grid{display:grid;grid-template-columns:1fr;gap:20px}@media (min-width: 768px){.grid{grid-template-columns:repeat(2,1fr)}}@media (min-width: 1200px){.grid{grid-template-columns:repeat(4,1fr)}}.card{background:var(--c-card);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;cursor:pointer;transition:transform .15s,box-shadow .15s;border:2px solid transparent}.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--c-accent)}.card .thumb{height:170px;background:var(--c-accent-bg);display:flex;align-items:center;justify-content:center}.card .thumb svg{width:130px;height:130px}.card .info{padding:14px 16px 16px}.card .info h3{font-size:18px;color:var(--c-primary-dark)}.card .meta{display:flex;gap:10px;margin-top:8px;color:var(--c-ink-soft);font-size:13px;align-items:center;flex-wrap:wrap}.badge{background:var(--c-accent-bg);color:var(--c-primary);border-radius:999px;padding:2px 10px;font-size:12px}.done-count{color:var(--c-secondary);font-size:13px;margin-top:6px}.learn-wrap{display:flex;flex-direction:column;height:calc(100vh - 61px);height:calc(100dvh - 61px)}.learn-main{flex:1;display:flex;min-height:0}.viewport{flex:1;position:relative;min-width:0;background:radial-gradient(circle at 50% 40%,#F1F8E9 0%,var(--c-paper) 75%)}.viewport>.stage{position:absolute;top:0;right:0;bottom:0;left:0}.cp-panel{width:260px;border-left:1px solid var(--c-accent);background:#fff;display:flex;flex-direction:column;padding:12px;gap:8px}.cp-panel.hidden{display:none}.cp-head{display:flex;align-items:center;justify-content:space-between}.cp-head h4{margin:0;font-size:14px;color:var(--c-primary-dark)}.cp-close{background:transparent;color:var(--c-ink-soft);min-width:32px;min-height:32px;font-size:15px;padding:0}.cp-close:hover{color:var(--c-warn);background:#ffebee}.cp-svg{flex:1;width:100%;min-height:0}@media (max-width: 767px){.cp-panel{position:absolute;right:8px;top:8px;width:158px;height:172px;border:2px solid var(--c-accent);border-radius:var(--radius-sm);box-shadow:var(--shadow-lg);z-index:5;background:#fff;padding:8px}.cp-panel .cp-close{min-width:26px;min-height:26px;font-size:13px}}.learn-controls{background:#fff;border-top:1px solid var(--c-accent);padding:10px 16px calc(10px + env(safe-area-inset-bottom));display:flex;flex-direction:column;gap:8px}.tip-line{text-align:center;font-size:17px;font-weight:600;color:var(--c-primary-dark);min-height:24px}.ctrl-row{display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap}.step-dots{display:flex;gap:6px;justify-content:center;flex-wrap:wrap}.dot{width:12px;height:12px;border-radius:50%;background:var(--c-accent-bg);border:1.5px solid var(--c-accent);cursor:pointer;padding:0;min-width:0;min-height:0}.dot.done{background:var(--c-secondary)}.dot.current{background:var(--c-primary);border-color:var(--c-primary);transform:scale(1.25)}.collision-banner{background:#ffebee;color:var(--c-warn);border:1.5px solid var(--c-warn);border-radius:var(--radius-sm);padding:8px 14px;font-size:15px;text-align:center;font-weight:600}.celebrate-layer{position:absolute;top:0;right:0;bottom:0;left:0;z-index:6;pointer-events:none;overflow:hidden;display:flex;align-items:flex-start;justify-content:center}.celebrate-banner{margin-top:18px;width:max-content;max-width:92%;text-align:center;background:var(--c-primary);color:#fff;border-radius:999px;padding:10px 26px;font-size:18px;font-weight:700;box-shadow:var(--shadow-lg);animation:banner-pop .5s cubic-bezier(.34,1.56,.64,1)}@keyframes banner-pop{0%{transform:scale(.4) translateY(-14px);opacity:0}to{transform:scale(1) translateY(0);opacity:1}}.confetti{position:absolute;top:0;right:0;bottom:0;left:0}.confetti i{position:absolute;top:-16px;display:block;animation:confetti-fall linear forwards}@keyframes confetti-fall{0%{transform:translate(0) rotate(0);opacity:1}85%{opacity:1}to{transform:translate(var(--drift),82vh) rotate(560deg);opacity:0}}.icon-btn{font-size:22px;display:flex;align-items:center;justify-content:center}.adv-wrap{max-width:900px;margin:0 auto;padding:24px 20px 60px;display:flex;flex-direction:column;gap:20px}.panel{background:var(--c-card);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px}.panel h3{color:var(--c-primary-dark);margin-bottom:12px}.panel p{color:var(--c-ink-soft);font-size:14px;line-height:1.6}.panel textarea{width:100%;min-height:180px;border:1.5px solid var(--c-accent);border-radius:var(--radius-sm);padding:10px;font-family:ui-monospace,monospace;font-size:13px;resize:vertical}.err-box{background:#ffebee;color:var(--c-warn);border-radius:var(--radius-sm);padding:10px 14px;font-size:13px;white-space:pre-wrap;font-family:ui-monospace,monospace}.ok-box{background:var(--c-accent-bg);color:var(--c-primary-dark);border-radius:var(--radius-sm);padding:10px 14px;font-size:14px}.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}.export-menu{position:relative}.export-menu-list{position:absolute;bottom:calc(100% + 6px);left:50%;transform:translate(-50%);background:#fff;border:1.5px solid var(--c-accent);border-radius:var(--radius-sm);box-shadow:var(--shadow-lg);display:flex;flex-direction:column;min-width:160px;padding:4px;gap:2px;z-index:30}.export-menu-list button{background:#fff;color:var(--c-primary-dark);text-align:left;padding:0 12px;min-height:40px;font-size:14px;border-radius:var(--radius-sm);white-space:nowrap}.export-menu-list button:hover{background:var(--c-accent-bg)}.color-pick{display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--c-primary-dark);background:var(--c-accent-bg);border-radius:var(--radius-sm);padding:0 10px;min-height:44px;cursor:pointer}.color-pick input[type=color]{width:26px;height:26px;border:1.5px solid var(--c-accent);border-radius:6px;padding:0;background:none;cursor:pointer}.fold-preview{position:relative;height:340px;margin-top:12px;border-radius:var(--radius-sm);border:1.5px solid var(--c-accent);background:radial-gradient(circle at 50% 40%,#F1F8E9 0%,var(--c-paper) 75%);overflow:hidden}.fold-preview>div{position:absolute;top:0;right:0;bottom:0;left:0}