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22px;position:sticky;top:0;height:100dvh;display:flex;flex-direction:column;gap:28px}.brand{display:flex;align-items:center;gap:10px;text-align:left;font-weight:900;font-size:17px;line-height:1.35}.brand img{width:42px;height:42px;border-radius:12px}.brand small{display:block;font-size:10px;letter-spacing:1.5px;color:var(--muted);margin-top:4px}.nav{display:flex;flex-direction:column;gap:10px}.nav button{display:flex;align-items:center;gap:13px;text-align:left;padding:15px 17px;border-radius:16px;font-size:16px;font-weight:800;color:#7b807a}.nav button.active{background:#eeffdf;color:#238600;box-shadow:inset 0 0 0 2px #bfeaa2}.nav svg{width:23px;height:23px}.sidebar-foot{margin-top:auto;border-top:1px solid var(--line);padding-top:20px;color:var(--muted);font-size:12px;line-height:1.8}.content{min-width:0;padding:32px 44px 50px}.topline{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:35px}.eyebrow{font-size:12px;font-weight:900;letter-spacing:1.3px;color:#85a17d}.icon-button{width:42px;height:42px;display:inline-grid;place-items:center;border-radius:13px;color:#7b807a}.icon-button:hover{background:#f2f4ef}.icon-button svg{width:24px;height:24px}.heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}.subtitle{font-size:14px;color:var(--muted);margin-top:8px}.today-note{font-size:13px;color:#7d9475;margin-top:8px}.lesson-card{display:flex;align-items:center;justify-content:space-between;text-align:left;width:100%;padding:22px 24px;border-radius:24px;background:#d4ffad;border:2px solid #88df48;margin:24px 0;gap:15px;color:#205b00}.lesson-card small{font-weight:900;font-size:14px}.lesson-card strong{font-size:23px;display:block;margin-top:5px;line-height:1.5;letter-spacing:-.7px}.lesson-card .lesson-icon{width:56px;height:62px;flex-shrink:0;border-radius:18px;background:#edffdf;display:grid;place-items:center;color:#21ad00}.lesson-icon svg{width:30px;height:30px}.stage-list{display:flex;flex-direction:column;gap:16px}.stage-card{width:100%;display:flex;align-items:center;gap:16px;border:2px solid var(--line);border-radius:22px;padding:18px;text-align:left;box-shadow:0 5px 0 var(--line);transition:transform .15s,border-color .15s}.stage-card:hover{transform:translateY(-2px);border-color:#c4d5b6}.stage-card .number{width:51px;height:57px;display:grid;place-items:center;flex:none;border-radius:16px;font-size:28px;font-weight:900}.stage-text{flex:1}.stage-text small{display:block;color:var(--muted);font-size:12px;font-weight:800;margin-bottom:3px}.stage-text strong{display:block;font-size:19px}.stage-text p{font-size:12px;color:var(--muted);margin-top:4px}.chevron{width:20px;color:#92968f}.green{--accent:#00b900;--ink:#205b00;--pale:#d4ffad;--under:#008c00}.blue{--accent:#28b4da;--ink:#005769;--pale:#d5f6ff;--under:#1192b6}.amber{--accent:#ffb80e;--ink:#754000;--pale:#fff4c5;--under:#dd8900}.purple{--accent:#a17aff;--ink:#6030ad;--pale:#f0e9ff;--under:#8a51f4}.teal{--accent:#00b6a2;--ink:#006d61;--pale:#d2fff3;--under:#008f7f}.number{background:var(--pale);color:var(--ink)}.small-tag{font-size:11px;color:#9b8bb1;background:#f4effb;padding:4px 7px;border-radius:7px}.button{border-radius:17px;padding:16px 22px;min-height:54px;display:inline-flex;align-items:center;justify-content:center;gap:9px;font-size:16px;font-weight:900;text-decoration:none;border:2px solid transparent;background:var(--accent,var(--green));color:var(--ink,#124c00);box-shadow:0 5px 0 var(--under,#009100);transition:transform .12s}.button:active{transform:translateY(3px);box-shadow:0 2px 0 var(--under,#009100)}.button svg{width:22px;height:22px}.button.secondary{background:#fff;border-color:var(--line);box-shadow:0 4px 0 var(--line);color:#71766e}.button.subtle{background:var(--pale,#f1f6ec);color:var(--ink,#297a05);box-shadow:none;padding:12px 16px;min-height:42px}.full{width:100%}.row{display:flex;align-items:center;gap:12px}.space{justify-content:space-between}.muted{color:var(--muted)}.tiny{font-size:12px}.section{margin:28px 0 15px}.cards{display:grid;gap:14px}.panel{padding:22px;border:2px solid var(--line);border-radius:22px}.lesson-row{padding:18px 20px;border:2px solid var(--line);border-radius:20px;text-align:left;display:flex;align-items:center;gap:15px;width:100%}.lesson-row.selected{border-color:#8ada52;background:#f6ffef}.lesson-index{font-weight:900;font-size:24px;width:42px;color:#829579}.lesson-row strong{display:block;font-size:16px;line-height:1.5}.lesson-row small{font-size:12px;color:var(--muted)}.search{width:100%;padding:14px 18px;margin:5px 0 22px;border:2px solid var(--line);border-radius:15px;background:#fbfcf9}.empty{text-align:center;padding:60px 20px}.empty svg{width:54px;height:54px;color:#c5cebf;margin-bottom:20px}.empty h2{margin-bottom:10px}.empty p{color:var(--muted);font-size:14px}.favorite-row{display:flex;align-items:center;gap:14px;padding:20px;border:2px solid var(--line);border-radius:20px}.favorite-copy{flex:1;min-width:0}.favorite-copy strong{display:block;font-size:18px}.favorite-copy small{display:block;color:var(--muted);font-size:12px;margin-top:5px}.check{width:24px;height:24px;accent-color:var(--green);flex:none}.heart{color:#9a9e96}.heart.saved{color:#f32348}.heart.saved svg{fill:currentColor}.favorite-start{position:sticky;bottom:18px;margin-top:22px;background:#fff;padding-top:12px}.stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:25px 0}.stat strong{font-size:38px;color:#43a624;display:block}.stat 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strong{font-size:clamp(22px,4.4vw,30px);line-height:1.5;letter-spacing:-.6px}.english-line{font-size:clamp(22px,4.5vw,31px);font-weight:900;line-height:1.5;word-break:normal;overflow-wrap:normal;hyphens:none}.chunk-pair{display:grid;grid-template-columns:1fr 1fr;gap:13px}.chunk-card{border:2px solid var(--line);border-radius:20px;padding:18px;min-width:0;word-break:normal}.chunk-card small{color:var(--muted);font-size:11px;display:block;margin-bottom:15px}.chunk-card strong{font-size:clamp(17px,3.7vw,26px);line-height:1.5;word-break:normal;overflow-wrap:normal}.choices{display:grid;gap:12px}.choice{width:100%;border:2px solid var(--line);border-radius:19px;box-shadow:0 5px 0 var(--line);padding:17px 19px;text-align:left;font-weight:900;font-size:clamp(19px,4vw,25px);line-height:1.45;word-break:normal;overflow-wrap:normal}.choice.selected{background:var(--pale);border-color:var(--accent);box-shadow:0 5px 0 var(--accent)}.choice:hover{background:#f7fbf3}.answer-card{border:2px solid var(--line);border-radius:21px;padding:22px;background:#d4ffad;display:grid;gap:12px}.answer-card.wrong{background:#ffe0e3}.answer-card strong{font-size:24px;color:#196500}.answer-card p{font-size:14px}.answer-card .english-line{font-size:24px}.train-footer{margin-top:auto;padding-top:15px;display:grid;gap:12px}.segment{background:#f0f0ee;border-radius:30px;display:flex;padding:3px;gap:3px}.segment button{flex:1;border-radius:25px;padding:9px 5px;font-size:13px;white-space:nowrap}.segment button.active{background:white;box-shadow:0 1px 4px 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23px;position:relative;margin-bottom:14px;background:#fff;min-height:136px}.bubble.thought{border-style:dashed;background:#fcfaff}.bubble.discovery{background:#f7f3ff}.bubble::after{content:'';position:absolute;bottom:-14px;left:33px;width:22px;height:22px;transform:rotate(45deg);background:inherit;border-right:2px solid #d8c5ff;border-bottom:2px solid #d8c5ff;border-bottom-right-radius:10px}.bubble.partner::after{left:auto;right:32px}.bubble.thought::after{border:2px solid #d8c5ff;border-radius:50%;height:14px;width:14px;bottom:-23px;transform:none}.bubble.thought::before{content:'';width:8px;height:8px;border:2px solid #d8c5ff;border-radius:50%;position:absolute;bottom:-37px;left:24px;background:#fcfaff}.bubble small{display:block;color:var(--ink);font-size:12px;font-weight:900;margin-bottom:12px}.bubble strong{display:block;font-size:clamp(21px,4.2vw,29px);font-weight:800;line-height:1.5;letter-spacing:-.5px}.bubble .translation{color:var(--muted);font-size:15px;margin-top:9px}.bubble .icon-button{position:absolute;right:10px;top:9px;color:var(--ink)}.scene-photo{position:relative;flex:none;width:100%;aspect-ratio:3/2;border-radius:22px;overflow:hidden;background:#f4efff;margin-top:12px}.scene-photo img{width:100%;height:100%;object-fit:cover}.scene-play{position:absolute;inset:0;display:grid;place-items:center;width:100%;background:none}.scene-play span{width:75px;height:75px;border-radius:50%;display:grid;place-items:center;background:#fffffff0;color:#6528b1}.scene-play svg{width:33px;height:33px;fill:currentColor}.cuts{display:flex;gap:5px;margin:8px 0}.cuts i{height:5px;flex:1;border-radius:7px;background:#eeeaf4}.cuts i.on{background:#ab85ff}.scene-controls{display:flex;justify-content:space-between;align-items:center;color:var(--ink);margin-top:5px}.scene-controls button{font-size:14px;font-weight:900;display:flex;gap:7px;align-items:center;padding:8px}.scene-controls svg{width:20px;height:20px}.answer-input{display:flex;align-items:flex-start;gap:14px;margin-top:25px;padding:10px 0 5px}.subject{font-family:Georgia,'Times New Roman',serif;font-weight:800;font-size:28px;line-height:1.5}.answer-input textarea{width:100%;min-width:0;resize:none;border:0;border-bottom:2px solid #ba98ff;outline:0;background:transparent;color:#3c3b41;font-size:22px;font-weight:800;line-height:1.6;min-height:45px;border-radius:0;caret-color:#9c6aff;padding:0 3px 3px}.answer-input textarea::placeholder{color:#c6bfd1;font-weight:600;font-size:17px}.listen-card{border:2px solid #c6eee4;background:#d9fbf3;border-radius:25px;padding:25px;display:grid;gap:17px}.listen-context{font-size:15px;color:#6a8b83;line-height:1.8}.listen-meaning{font-size:29px;font-weight:900;letter-spacing:-.8px}.listen-english{font-size:26px;font-weight:900}.listen-sentence{font-size:15px;color:#74827a}.listen-visual{height:86px;display:flex;align-items:center;justify-content:center;gap:5px;color:#00ad99}.listen-visual i{width:6px;border-radius:9px;background:currentColor;height:18px;animation:wave 1s ease-in-out infinite;animation-delay:var(--delay)}.listen-visual.paused i{animation-play-state:paused;opacity:.5}@keyframes wave{50%{height:52px}}.play-controls{display:flex;align-items:center;justify-content:center;gap:35px;margin:8px 0}.play-controls .big{width:76px;height:76px;border-radius:50%;background:#00b09b;color:white;box-shadow:0 6px 0 #008e7e}.big svg{width:30px;height:30px}.settings-row{padding:18px 0;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:15px}.settings-row strong{font-size:15px}.settings-row p{font-size:12px;color:var(--muted);margin-top:5px}.settings-row select{padding:8px 12px;border:2px solid var(--line);border-radius:12px;background:#fff;font-size:13px;max-width:150px}.setting-buttons{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:14px 0}.setting-buttons button{padding:12px 4px;border:2px solid var(--line);border-radius:14px;font-weight:800;font-size:13px}.setting-buttons button.active{background:#e4fbf5;border-color:#00ad99;color:#007366}.custom-duration{display:flex;gap:10px;align-items:center;margin:12px 0}.custom-duration input{width:86px;border:2px solid var(--line);border-radius:12px;padding:10px;outline:none}.custom-duration input:focus{border-color:#00b09b}.switch{accent-color:#00ae99;width:20px;height:20px}.model-card{background:#f5f1ff;border:1px solid #e9defd;border-radius:17px;padding:17px;display:grid;gap:10px;margin-top:15px}.model-card small{font-size:12px;color:#8a769f;line-height:1.7}.model-card .button{font-size:13px;min-height:40px;padding:10px}.install-banner{display:flex;gap:12px;align-items:center;margin-top:25px;background:#f5f9f0;border-radius:17px;padding:16px}.install-banner img{width:36px;height:36px;border-radius:10px}.install-banner p{font-size:12px;color:#7c8975}.install-banner strong{font-size:13px}.install-banner button{margin-left:auto;font-size:12px;color:#538c26;font-weight:900;white-space:nowrap}.boot{min-height:100dvh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:18px}.boot img{width:72px;border-radius:20px}.boot strong{font-size:26px}.boot span{font-size:14px;color:var(--muted)}#toast{position:fixed;left:50%;bottom:max(95px,env(safe-area-inset-bottom));transform:translate(-50%,20px);opacity:0;pointer-events:none;transition:.2s;z-index:1000;background:#343b30;color:#fff;padding:13px 20px;border-radius:15px;font-size:13px;width:max-content;max-width:85%;text-align:center;box-shadow:0 5px 22px #0002}#toast.show{opacity:1;transform:translate(-50%,0)}.overlay{position:fixed;inset:0;background:#2730215c;z-index:100;display:grid;place-items:center;padding:20px}.sheet{width:100%;max-width:480px;background:#fff;border-radius:26px;padding:25px;max-height:90dvh;overflow:auto}.sheet h2{font-size:22px;margin-bottom:16px}.sheet p{font-size:14px;color:#858a7e;margin-bottom:18px}.onboarding-note{font-size:12px;color:#999f93;line-height:1.7;margin-top:22px}.offline-status{font-size:11px;color:#8b987f}.nav-label{display:none}.skeleton{animation:pulse 1s infinite}@keyframes pulse{50%{opacity:.5}}
@media(min-width:1000px){.content{padding:38px 58px 60px}.app-shell{box-shadow:0 0 90px #68825308}.train-shell{padding-top:35px;box-shadow:0 0 90px #68825308}.stage-card{padding:19px 21px}.stage-list{gap:17px}.lesson-card{padding:25px 28px}}
@media(max-width:700px){:root{background:#fff}.app-shell{display:block}.sidebar{display:none}.content{padding:22px 22px 110px}.topline{margin-bottom:26px}.topline .eyebrow{font-size:10px}.mobile-brand{font-weight:900;color:#4a8427;font-size:16px;letter-spacing:-.5px}.mobile-nav{position:fixed;bottom:0;left:0;right:0;z-index:40;background:#fffffff2;backdrop-filter:blur(16px);border-top:1px solid #eef0e9;display:flex;padding:8px 13px max(10px,env(safe-area-inset-bottom));gap:4px}.mobile-nav button{flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;color:#999d94;padding:7px 0;border-radius:17px;font-size:10px;font-weight:800}.mobile-nav button.active{background:#f0f9e6;color:#369600}.mobile-nav svg{width:24px;height:24px}h1{font-size:27px}.lesson-card{padding:19px 20px;margin:22px 0}.lesson-card strong{font-size:21px}.stage-card{padding:16px 15px;gap:13px}.stage-text strong{font-size:17px}.stage-text p{font-size:11px}.number{width:46px!important;height:52px!important}.train-shell{padding:16px 19px max(25px,env(safe-area-inset-bottom));gap:17px}.train-head{font-size:12px}.train-progress .bar{height:10px}.prompt{padding:18px 20px}.prompt strong{font-size:25px}.bubble{padding:18px 22px}.scene-photo{border-radius:20px}.stage-list{gap:16px}.train-footer{position:sticky;bottom:0;background:#fff;padding-bottom:6px}.favorite-start{bottom:80px}.chunk-card{padding:15px}.subtitle{font-size:13px}.listen-card{padding:22px}.listen-meaning{font-size:27px}}
@media(min-width:701px){.mobile-nav,.mobile-brand{display:none}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}
.chunk-card.active{border-color:var(--accent);background:var(--pale);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 12%,transparent);transition:background .18s,border-color .18s}
.chunk-card.active small{color:var(--ink);font-weight:900}.chunk-card.active strong{color:var(--ink)}