@import url('./fonts/fonts.css');
:root{--bg:#f7f6f2;--paper:#fff;--ink:#1b2d2b;--muted:#73817d;--line:#e7eae4;--teal:#176a5b;--soft:#eaf4ee;--gold:#e3b65e;--coral:#e68b75;--shadow:0 16px 40px rgba(20,52,44,.055)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:Manrope,'Noto Sans CJK SC','Microsoft YaHei',sans-serif;font-size:14px}button,input,textarea,select{font:inherit}button{cursor:pointer}a{text-decoration:none;color:inherit}.shell{min-height:100vh;display:grid;grid-template-columns:248px minmax(0,1fr)}.sidebar{background:#173c36;color:#fff;min-height:100vh;padding:33px 22px;display:flex;flex-direction:column;position:sticky;top:0;height:100vh}.brand{display:flex;align-items:center;gap:11px;font-size:21px;font-weight:800;letter-spacing:-.8px;padding:0 10px 47px}.brand-mark{width:35px;height:35px;background:#d6f0df;color:#174537;border-radius:11px;display:grid;place-items:center;font-size:22px;font-weight:800}.brand small{display:block;color:#93b8a7;font-size:8px;font-weight:800;letter-spacing:2.1px;margin-top:-2px}.side-label{color:#85aa9b;font-size:10px;font-weight:800;letter-spacing:2px;padding:0 15px;margin-bottom:15px}.nav-item{display:flex;align-items:center;gap:12px;width:100%;padding:12px 15px;border:0;border-radius:11px;background:none;color:#bfd3c9;text-align:left;margin:3px 0;font-weight:700}.nav-item.active,.nav-item:hover{background:#2a5148;color:#fff}.nav-icon{font-size:18px;width:22px;text-align:center;font-weight:400}.side-bottom{margin-top:auto;padding:20px 12px;border-top:1px solid #386057}.side-quote{font-size:18px;font-weight:700;line-height:1.5;margin-bottom:17px}.side-bottom span{color:#9fbdae;font-size:11px}.main-wrap{min-width:0}.topbar{height:80px;display:flex;align-items:center;justify-content:space-between;padding:0 clamp(24px,5vw,76px);border-bottom:1px solid var(--line);background:rgba(255,255,255,.56)}.crumb{font-size:11px;font-weight:800;letter-spacing:1.6px;color:#8b9893}.crumb span{margin:0 12px;color:#c4cdc8}.crumb strong{color:#285a4d;letter-spacing:0;font-size:12px}.top-actions{display:flex;align-items:center;gap:16px;color:#64746d;font-size:12px}.icon-btn{border:1px solid var(--line);background:white;border-radius:10px;padding:8px 10px;color:#486457}.mobile-nav{display:none}main{max-width:1260px;margin:auto;padding:38px clamp(24px,5vw,76px) 90px}.eyebrow{font-size:11px;letter-spacing:2px;text-transform:uppercase;color:var(--teal);font-weight:800}.page-title{font-size:clamp(30px,3.5vw,48px);letter-spacing:-2px;line-height:1.16;margin:12px 0 12px;font-weight:800}.sub{color:var(--muted);line-height:1.8;margin:0 0 28px;max-width:690px}.hero{background:#dcece3;border-radius:20px;padding:38px 43px;min-height:275px;position:relative;overflow:hidden;display:flex;justify-content:space-between;gap:20px}.hero:after{content:"m.";position:absolute;right:25px;bottom:-91px;font-size:310px;font-weight:800;line-height:1;color:#bfdccd;opacity:.75;pointer-events:none}.hero h1{position:relative;z-index:1;font-size:clamp(28px,3.2vw,44px);line-height:1.25;letter-spacing:-1.8px;margin:16px 0 14px;max-width:560px}.hero p{position:relative;z-index:1;max-width:480px;color:#527168;line-height:1.8}.hero .btn{position:relative;z-index:1;margin-top:10px}.hero-meta{position:relative;z-index:1;align-self:flex-start;background:#fff9;border:1px solid #fff9;border-radius:12px;padding:13px 16px;font-size:12px;white-space:nowrap;color:#31574d}.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;border:0;background:var(--teal);color:#fff;border-radius:10px;padding:12px 19px;font-weight:800;font-size:13px}.btn:hover{background:#105748}.btn.light{background:#eef5f0;color:#205d4d}.btn.outline{border:1px solid #bdd5c9;color:#236653;background:white}.btn.ghost{background:transparent;color:var(--teal)}.btn:disabled{opacity:.5;cursor:not-allowed}.section-head{display:flex;justify-content:space-between;align-items:end;gap:18px;margin:32px 0 16px}.section-head h2{font-size:20px;letter-spacing:-.5px;margin:0}.section-head p{color:var(--muted);margin:5px 0 0;font-size:12px}.text-link{color:var(--teal);font-weight:800;font-size:12px}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:20px 0 29px}.stat,.card{background:var(--paper);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:15px}.stat{padding:20px}.stat .n{font-size:27px;font-weight:800;margin:7px 0 3px}.stat .k{color:var(--muted);font-size:11px}.stat .symbol{color:var(--teal);font-size:17px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.lesson-card{padding:20px;display:flex;flex-direction:column;min-height:192px;transition:transform .2s,border-color .2s}.lesson-card:hover{transform:translateY(-3px);border-color:#b8d2c4}.lesson-no{font-size:11px;font-weight:800;color:var(--teal);letter-spacing:1px}.lesson-card h3{font-size:17px;margin:22px 0 6px}.lesson-card p{color:var(--muted);font-size:12px;margin:0;line-height:1.6}.lesson-foot{display:flex;justify-content:space-between;align-items:center;margin-top:auto;padding-top:17px;color:#789087;font-size:11px}.progress-track{background:#e9eee9;height:6px;border-radius:20px;overflow:hidden}.progress-track>span{height:100%;display:block;background:var(--teal);border-radius:20px}.lesson-card .progress-track{width:70px}.callout{background:#f2f6f1;border:1px solid #e0eae0;border-radius:14px;padding:18px 21px;color:#46635a;line-height:1.7}.lesson-top{display:flex;justify-content:space-between;gap:18px;align-items:start}.back{border:0;background:none;color:var(--teal);font-weight:800;padding:0 0 14px}.stepper{display:flex;gap:7px;overflow-x:auto;margin:25px 0 24px;padding:4px 0}.step{white-space:nowrap;border:1px solid var(--line);background:#fff;color:#687d73;border-radius:10px;padding:11px 15px;font-size:12px;font-weight:800}.step.active{background:var(--teal);color:#fff;border-color:var(--teal)}.step.done{border-color:#b5d9c1;color:var(--teal)}.panel{padding:clamp(21px,3vw,34px)}.panel h2{margin:0 0 9px;font-size:22px;letter-spacing:-.5px}.panel .hint{color:var(--muted);line-height:1.75;margin:0 0 24px}.row{display:flex;align-items:center;justify-content:space-between;gap:12px}.row.wrap{flex-wrap:wrap}.chip{display:inline-flex;align-items:center;border-radius:30px;background:var(--soft);color:var(--teal);padding:7px 11px;font-size:11px;font-weight:800}.word-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.word{border:1px solid var(--line);border-radius:13px;padding:17px;background:#fff}.word h3{font-size:22px;margin:3px 0 2px}.word .ipa{color:#657f72;font-size:13px}.word p{margin:9px 0;color:#52675d;line-height:1.55;font-size:12px}.word .cn{font-weight:800;color:var(--ink);font-size:13px}.word .gram{color:#75857f}.word .ex{border-top:1px solid var(--line);padding-top:10px}.word .ex small{display:block;color:#8a9891;margin-top:3px}.word-actions{display:flex;gap:7px;margin-top:13px}.mini-btn{border:1px solid #d8e6dc;background:#f8fbf8;color:#286a56;padding:7px 10px;border-radius:8px;font-size:11px;font-weight:800}.mini-btn.selected{background:var(--teal);color:white}.audio-box{display:flex;align-items:center;gap:15px;background:#eaf3ed;border-radius:13px;padding:16px;margin:17px 0}.audio-box .play{width:42px;height:42px;border:0;border-radius:50%;background:var(--teal);color:#fff;font-size:18px;flex:0 0 auto}.audio-box strong{display:block;font-size:13px}.audio-box small{color:#698276;font-size:11px;display:block;margin-top:3px}.audio-box audio{width:100%;max-width:420px;height:32px}.field{display:block;margin:14px 0}.field>span{display:block;color:#52675d;font-weight:700;font-size:12px;margin-bottom:7px}.field input,.field textarea,select{border:1px solid #dce5dd;background:#fff;border-radius:9px;padding:11px 12px;width:100%;outline:none;color:var(--ink)}.field input:focus,.field textarea:focus{border-color:var(--teal);box-shadow:0 0 0 3px #dcefe4}.field textarea{min-height:140px;resize:vertical;line-height:1.7}.answer-list{display:grid;gap:8px}.answer-item{background:#f9faf7;border:1px solid var(--line);padding:12px 15px;border-radius:10px}.answer-item strong{font-size:12px}.answer-item p{margin:6px 0 0;color:#64776b;line-height:1.6;font-size:12px}.answer-item.good{border-color:#a7d6b5;background:#f1faf3}.answer-item.bad{border-color:#ebc4b5;background:#fff7f2}.passage{background:#fcfcf9;border-left:3px solid #9cc5ac;border-radius:0 10px 10px 0;padding:21px 24px;line-height:2;font-size:15px;max-width:760px}.question{border-top:1px solid var(--line);padding:17px 0}.question:first-child{border-top:0}.question p{font-weight:700;line-height:1.65;margin:0 0 10px}.question small{color:#8a9a91}.flex-col{display:flex;flex-direction:column;gap:12px}.action-row{display:flex;gap:9px;flex-wrap:wrap;margin-top:21px}.step-footer{display:flex;justify-content:space-between;gap:12px;border-top:1px solid var(--line);padding-top:20px;margin-top:28px}.two-col{display:grid;grid-template-columns:1.5fr 1fr;gap:17px}.note{border-radius:13px;background:#f6f5ef;padding:19px;line-height:1.75;color:#57685c}.note h3{margin:0 0 9px;color:var(--ink)}.note p{margin:7px 0}.prompt{font-size:16px;font-weight:700;line-height:1.6;padding:17px;background:#f7faf6;border:1px solid #e5eee7;border-radius:10px}.prompt small{display:block;color:var(--teal);font-size:11px;margin-bottom:7px;letter-spacing:1px}.timer{font-size:20px;font-weight:800;color:var(--teal)}.rec-dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:#e96262;margin-right:7px;animation:pulse 1s infinite}@keyframes pulse{50%{opacity:.25}}.tag{font-size:11px;background:#edf3ee;color:#527261;border-radius:20px;padding:5px 10px}.review-card{padding:23px;max-width:620px}.review-front{font-size:31px;font-weight:800;margin:26px 0 4px}.review-ipa{color:#7a8f81}.review-answer{border-top:1px solid var(--line);padding-top:16px;margin-top:23px;line-height:1.75}.timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.timeline .card{padding:19px}.timeline strong{display:block;margin:8px 0}.timeline p{color:var(--muted);font-size:11px;line-height:1.65}.bar-chart{display:flex;align-items:end;gap:8px;height:120px}.bar-col{flex:1;text-align:center;color:#91a097;font-size:10px}.bar{background:#c4ddcd;border-radius:6px 6px 0 0;min-height:3px;margin-bottom:7px}.bar.active{background:var(--teal)}.empty{padding:40px;text-align:center;color:var(--muted);background:#fff;border:1px dashed #d6e2d9;border-radius:14px}.empty strong{display:block;color:var(--ink);font-size:17px;margin:8px 0}.muted{color:var(--muted)}.divider{height:1px;background:var(--line);margin:22px 0}.small{font-size:12px;line-height:1.7}.toast{position:fixed;bottom:28px;right:28px;background:#193e35;color:#fff;padding:12px 17px;border-radius:10px;box-shadow:var(--shadow);opacity:0;transform:translateY(12px);transition:.2s;pointer-events:none;z-index:50}.toast.show{opacity:1;transform:none}.modal-back{position:fixed;inset:0;background:#132a24a8;display:grid;place-items:center;padding:20px;z-index:40}.modal{background:white;border-radius:16px;padding:26px;max-width:500px;width:100%;max-height:90vh;overflow:auto}.modal h2{margin:0 0 10px}.hidden{display:none!important}@media(max-width:1050px){.sidebar{width:205px;padding:28px 14px}.shell{grid-template-columns:205px 1fr}.grid{grid-template-columns:repeat(2,1fr)}.stats{grid-template-columns:repeat(2,1fr)}.timeline{grid-template-columns:repeat(2,1fr)}}@media(max-width:730px){.shell{display:block}.sidebar{display:none}.topbar{height:57px;padding:0 19px}.top-actions #todayDate{display:none}.crumb{font-size:10px}.crumb strong{font-size:11px}.mobile-nav{display:flex;position:fixed;bottom:0;left:0;right:0;background:#fff;box-shadow:0 -6px 20px #1b33220d;z-index:30;justify-content:space-around;padding:7px 5px calc(7px + env(safe-area-inset-bottom))}.mobile-nav button{border:0;background:none;color:#788b80;font-size:10px;font-weight:800;display:grid;gap:2px;justify-items:center;padding:5px}.mobile-nav button b{font-size:19px;font-weight:400}.mobile-nav button.active{color:var(--teal)}main{padding:24px 17px 105px}.hero{padding:26px;min-height:310px;display:block}.hero:after{font-size:200px;bottom:-55px}.hero-meta{display:inline-block;margin-top:14px}.grid,.word-grid,.two-col,.timeline{grid-template-columns:1fr}.stats{gap:8px}.stat{padding:14px}.stat .n{font-size:22px}.lesson-card{min-height:165px}.stepper{margin:16px -17px;padding:4px 17px}.step{padding:9px 12px}.panel{padding:19px}.audio-box{flex-wrap:wrap}.audio-box audio{width:100%;max-width:none}.step-footer{flex-wrap:wrap}.step-footer .btn{flex:1}.toast{bottom:77px;left:17px;right:17px;text-align:center}.page-title{letter-spacing:-1px}}