.auth-v4{--auth-accent:#c8ea74;--auth-ink:#202820;--auth-muted:#63705f;--auth-soft:#eff4e5;--auth-line:#dfe3d8;min-height:calc(100vh - 34px);color:var(--auth-ink);background:#fff;grid-template-columns:minmax(0,1.13fr) minmax(420px,1fr);display:grid}.a4-showcase{background:radial-gradient(at 8% 14%,#c8ea7438,#0000 55%),linear-gradient(145deg,#f7f7f2,#f0f2eb 85%);flex-direction:column;min-width:0;padding:38px clamp(24px,3vw,62px) 34px;display:flex;position:relative;overflow:hidden}.a4-brand{z-index:1;align-items:center;gap:10px;margin-bottom:40px;display:flex}.a4-brand>img{border-radius:8px;width:32px;height:32px}.a4-brand>strong{letter-spacing:-.7px;color:var(--auth-ink);font-size:24px;font-weight:650}.a4-showcase-heading{z-index:1;max-width:560px;min-height:165px;animation:.45s both a4-heading-in;position:relative}.a4-showcase-heading h1{letter-spacing:-1.35px;max-width:510px;color:var(--auth-ink);margin:0 0 16px;font-size:clamp(31px,3vw,45px);font-weight:620;line-height:1.14}.a4-showcase-heading>p{color:var(--auth-muted);max-width:460px;margin:0;font-size:15px;line-height:1.65}.a4-scene{min-width:0;height:445px;margin:24px 0;animation:.55s cubic-bezier(.22,.61,.36,1) both a4-scene-in;position:relative}.a4-scene:before{content:"";filter:blur(25px);background:radial-gradient(#c8ea744d,#0000 70%);animation:11s ease-in-out infinite a4-light;position:absolute;inset:15% 2%}.a4-feature-tabs{z-index:2;gap:9px;margin-top:auto;display:flex;position:relative}.a4-feature-tabs>button{min-width:0;color:var(--auth-muted);cursor:pointer;background:0 0;border:1px solid #0000;border-radius:10px;flex:1;justify-content:center;align-items:center;gap:7px;padding:16px 8px 19px;font-size:14px;transition:background .2s,color .2s;display:flex;position:relative}.a4-feature-tabs>button.active{border-color:var(--auth-line);color:var(--auth-ink);background:#fffffff2;box-shadow:0 3px 10px #20282005}.a4-feature-tabs>button>svg{flex:none}.a4-scene-progress{background:#dce3d2;border-radius:3px;height:4px;position:absolute;bottom:5px;left:9px;right:9px;overflow:hidden}.a4-scene-progress>b{transform-origin:0;background:linear-gradient(90deg,#a6cc53,#c8ea74);width:100%;height:100%;transition:transform 80ms linear;display:block}.a4-feature-tabs>button:not(.active) .a4-scene-progress{background:#dfe3d870}.a4-live-scene,.a4-practice-scene,.a4-chat-scene{width:100%;height:100%;position:relative}.a4-live-scene{grid-template-columns:minmax(0,1fr) minmax(0,1.08fr);align-items:center;gap:16px;display:grid}.a4-video{z-index:2;background:#fff;border:5px solid #fff;border-radius:17px;min-width:0;animation:8s ease-in-out infinite a4-float-video;overflow:hidden;box-shadow:0 15px 40px #20282015}.a4-video-portrait{aspect-ratio:846/674;background:#f7f7f2;border-radius:11px 11px 0 0;width:100%;position:relative;overflow:hidden}.a4-video-portrait>img{object-fit:contain;object-position:center;width:100%;max-width:100%;height:100%;display:block}.a4-photo-fallback{width:100%;height:100%;color:var(--auth-muted);background:var(--auth-soft);place-items:center;display:grid}.a4-video-footer{background:#fff;padding:11px 9px 9px}.a4-video-label{color:var(--auth-ink);align-items:center;gap:7px;font-size:14px;line-height:1.4;display:flex}.a4-video-label>span{background:#6c8f38;border-radius:50%;flex:none;width:6px;height:6px}.a4-video-label>strong{overflow-wrap:anywhere;font-weight:550}.a4-video-tools{justify-content:center;gap:9px;margin-top:11px;display:flex}.a4-video-tools>span{border:1px solid var(--auth-line);background:var(--auth-soft);width:32px;height:32px;color:var(--auth-ink);border-radius:9px;place-items:center;display:grid}.a4-board{border:1px solid var(--auth-line);background:#fff;border-radius:14px;min-width:0;padding:16px;animation:9s ease-in-out infinite a4-float-board;position:relative;box-shadow:0 15px 40px #20282012}.a4-board>header{border-bottom:1px solid var(--auth-line);color:var(--auth-muted);align-items:center;gap:7px;padding-bottom:13px;font-size:14px;display:flex}.a4-board>header>svg{flex:none}.a4-board>h3{letter-spacing:-.4px;color:var(--auth-ink);margin:19px 0;font-size:22px;font-weight:550;line-height:1.35}.a4-grammar-note{background:linear-gradient(125deg,#eff4e5,#f8faef);border:1px solid #dce7c7;border-radius:9px;padding:12px}.a4-grammar-note>span{letter-spacing:.02em;color:#536336;font-size:14px;font-weight:600;display:block}.a4-grammar-note>p{color:var(--auth-ink);margin:9px 0 0;font-size:15px;line-height:1.55}.a4-grammar-note b{font-weight:550;box-shadow:inset 0 -5px #c8ea7466}.a4-board-word{color:var(--auth-muted);gap:5px;margin:16px 0 11px;font-size:14px;line-height:1.4;display:grid}.a4-board-word strong{color:var(--auth-ink);font-weight:550}.a4-board-cursor{color:#587534;align-items:center;gap:4px;animation:7s ease-in-out infinite a4-cursor;display:flex;position:absolute;bottom:18px;right:8px}.a4-board-cursor>span{color:var(--auth-ink);background:#c8ea74;border-radius:4px;padding:4px 6px;font-size:14px}.a4-practice-scene{justify-content:center;align-items:center;display:flex}.a4-match-card{border:1px solid var(--auth-line);background:#fff;border-radius:18px;width:100%;max-width:550px;padding:20px;animation:9s ease-in-out infinite a4-match-float;position:relative;box-shadow:7px 6px 0 -2px #e9eddf,11px 10px 0 -3px #dfe4d7,0 18px 40px #20282012}.a4-match-card>header{border-bottom:1px solid var(--auth-line);color:var(--auth-muted);justify-content:space-between;align-items:center;gap:12px;padding-bottom:16px;font-size:14px;display:flex}.a4-match-card>header>span{color:var(--auth-ink);align-items:center;gap:8px;display:flex}.a4-match-card>header>strong{background:var(--auth-soft);color:var(--auth-ink);border-radius:6px;padding:5px 8px;font-size:14px;font-weight:550}.a4-match-card>h3{letter-spacing:-.4px;color:var(--auth-ink);margin:18px 0;font-size:21px;font-weight:550}.a4-match-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:13px;display:grid;position:relative}.a4-match-column{gap:10px;display:grid}.a4-match-word{border:1px solid var(--auth-line);height:66px;color:var(--auth-ink);background:#fff;border-radius:10px;justify-content:space-between;align-items:center;gap:5px;padding:9px 12px;font-size:14px;line-height:1.35;transition:background .3s,border-color .3s,box-shadow .3s;display:flex}.a4-match-word>svg{color:#567735;flex:none}.a4-match-word.selected{background:#f6f9ef;border-color:#7d9c50;box-shadow:0 0 0 3px #c8ea7433}.a4-match-word.matched{background:linear-gradient(120deg,#eff4e5,#e2efc9);border-color:#a8c77a}.a4-practice-cursor{z-index:3;color:#26331e;filter:drop-shadow(0 2px 2px #fff);pointer-events:none;transition:left .5s ease-in-out,top .5s ease-in-out;position:absolute}.a4-practice-cursor>svg{z-index:2;stroke:#fff;stroke-width:1.5px;position:relative}.a4-practice-cursor>i{opacity:0;border:2px solid #88ae42;border-radius:50%;width:30px;height:30px;position:absolute;top:-10px;left:-12px}.a4-practice-cursor.clicking>i{animation:.35s ease-out a4-click}.a4-match-card>footer{color:var(--auth-muted);margin-top:17px;font-size:14px}.a4-match-card>footer>span{align-items:center;gap:7px;line-height:1.4;display:flex}.a4-match-card>footer>div{background:#e9ede2;border-radius:3px;height:5px;margin-top:12px;overflow:hidden}.a4-match-card>footer>div>i{background:#a8ce58;border-radius:3px;height:100%;transition:width .4s;display:block}.a4-chat-scene{justify-content:center;align-items:center;display:flex}.a4-chat-window{border:1px solid var(--auth-line);background:#fff;border-radius:17px;flex-direction:column;width:100%;max-width:560px;height:440px;animation:10s ease-in-out infinite a4-chat-float;display:flex;position:relative;overflow:hidden;box-shadow:0 17px 42px #20282012}.a4-chat-window>header{border-bottom:1px solid var(--auth-line);flex:none;align-items:center;gap:11px;min-height:67px;padding:12px 18px;display:flex}.a4-student-chat-avatar{width:39px;height:39px;color:var(--auth-ink);background:linear-gradient(135deg,#e6f0d4,#c8ea74);border:1px solid #dbe6c7;border-radius:12px;flex:none;place-items:center;font-size:17px;font-weight:550;display:grid}.a4-chat-window>header>span{flex:1}.a4-chat-window header strong{color:var(--auth-ink);font-size:16px;font-weight:550;display:block}.a4-chat-window header small{color:var(--auth-muted);margin-top:3px;font-size:14px;display:block}.a4-chat-window header>svg{color:var(--auth-muted)}.a4-chat-body{scrollbar-width:none;background:radial-gradient(at 80% 20%,#f4f8ec,#f9faf7);flex-direction:column;flex:1;gap:9px;min-height:0;padding:15px 16px;display:flex;overflow:auto}.a4-chat-row{flex:none;align-items:flex-end;gap:7px;animation:.35s both a4-message-in;display:flex}.a4-chat-row.outgoing{justify-content:flex-end}.a4-scene-message{border:1px solid var(--auth-line);max-width:88%;color:var(--auth-ink);background:#fff;border-radius:11px 11px 11px 3px;padding:9px 11px}.a4-scene-message.outgoing{background:linear-gradient(120deg,#eff4e5,#e5efcf);border-color:#d7e4c0;border-radius:11px 11px 3px;max-width:calc(100% - 46px)}.a4-scene-message p{color:var(--auth-ink);margin:0;font-size:14px;line-height:1.4}.a4-scene-message small{color:#69775d;justify-content:flex-end;align-items:center;gap:4px;margin-top:4px;font-size:14px;line-height:1.35;display:flex}.a4-chat-own-avatar{object-fit:contain;border:1px solid var(--auth-line);background:#fff;border-radius:7px;flex:none;width:38px;max-width:38px;height:31px}.a4-scene-typing{border:1px solid 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