@layer base,layout,components,responsive;@layer base{:root{font-family:Inter,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;color:#24332e;background:#f6f7f8;font-synthesis:none;font-size:16px;line-height:1.65;--bg:#f6f7f8;--panel:#fff;--text:#24332e;--muted:#7b8580;--border:#e5e9e6;--green:#176b59;--green-soft:#eaf3ef;--hover:#f4f7f5;--red:#a8433b;--hero:#eef4f0;--shadow:0 5px 25px #1d3a2c05}:root[data-theme=dark]{color-scheme:dark;--bg:#17201d;--panel:#202c27;--text:#e0e9e2;--muted:#a4b3a9;--border:#36453c;--green:#88cdb5;--green-soft:#2e453a;--hover:#29392f;--red:#f0a59c;--hero:#283e32;color:var(--text);background:var(--bg)}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,select{cursor:pointer}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{color:inherit}a{color:inherit;text-decoration:none}button{background:none;border:0}input,textarea,select{color:var(--text);background:var(--panel);border:1px solid var(--border);border-radius:7px;padding:9px 12px}input[type=checkbox],input[type=radio]{accent-color:var(--green);width:16px;height:16px;flex-shrink:0;margin:0}textarea{resize:vertical}button:disabled{opacity:.42;cursor:not-allowed}a,button,input,select,textarea{outline-offset:4px}:focus-visible{outline:2px solid var(--green)}h1,h2,h3,p{margin-top:0}h1{font-size:32px;line-height:1.4;font-weight:650;letter-spacing:-.8px;margin-bottom:12px}h2{font-size:19px;line-height:1.5;font-weight:650;margin-bottom:12px}h3{font-size:18px;font-weight:650;margin-bottom:10px}p{margin-bottom:14px}small{font-size:14px}ul,ol{padding-left:23px}li+li{margin-top:9px}svg{flex-shrink:0;vertical-align:middle}fieldset{border:0;margin:0;padding:0}::selection{background:#c6e8db;color:#15392a}html{scroll-behavior:smooth;scroll-padding-top:85px}.sr-only{position:absolute;clip:rect(0,0,0,0);width:1px;height:1px;overflow:hidden;white-space:nowrap}.skip-link{position:fixed;z-index:100;top:-80px;left:12px;background:var(--green);color:#fff;padding:10px}.skip-link:focus{top:10px}.muted{color:var(--muted)}}@layer layout{.app-shell{min-height:100vh}.sidebar{width:238px;position:fixed;inset:0 auto 0 0;background:var(--panel);border-right:1px solid var(--border);display:flex;flex-direction:column;z-index:30;padding:30px 18px 18px}.brand{display:flex;align-items:center;gap:11px;padding:0 13px 36px;font-size:21px;font-weight:700;letter-spacing:-.5px}.brand small{display:block;font-weight:400;font-size:13px;letter-spacing:3px;color:var(--muted);margin-top:1px}.brand-mark{font-family:Georgia,serif;font-size:32px;line-height:43px;text-align:center;display:block;width:43px;height:43px;border-radius:12px;color:#fff;background:#176b59;position:relative;font-weight:400}.brand-mark>span{color:#aec4b7;font-size:24px}.nav-heading{font-size:13px;color:var(--muted);letter-spacing:1px;margin:0 15px 12px;display:flex;justify-content:space-between}.nav-heading>span{font-size:12px;letter-spacing:1.2px}.nav-item{display:flex;align-items:center;gap:12px;padding:11px 15px;border-radius:7px;margin:4px 0;color:#68756d;font-size:15px;font-weight:500}.nav-item.active{color:var(--green);background:var(--green-soft);font-weight:650}.nav-item:hover{background:var(--hover)}.nav-count{margin-left:auto;font-size:12px;padding:0 5px;background:var(--green);color:var(--panel);border-radius:4px}.sidebar-bottom{margin-top:auto}.study-note{margin:34px 13px 25px;padding:22px 15px 18px;background:var(--hover);border:1px solid var(--border);border-radius:8px}.study-note .tiny-label{font-size:12px;letter-spacing:.8px;color:var(--muted)}.study-note p{margin:14px 0;font-family:Georgia,Microsoft YaHei,serif;font-size:16px;line-height:1.9}.mini-rule{width:25px;height:2px;background:#bdcfc4}.sidebar-about{display:flex;justify-content:space-between;font-size:14px;color:var(--muted);padding:7px 16px}.local-indicator{display:flex;gap:6px;align-items:center;font-size:12px;color:var(--muted);padding:22px 13px 0}.local-indicator>span{width:5px;height:5px;background:#6c9a7d;border-radius:50%}.workspace{margin-left:238px;min-width:0}.topbar{height:74px;padding:0 37px;display:flex;justify-content:space-between;align-items:center;gap:15px;border-bottom:1px solid var(--border);background:var(--panel)}.topbar-location{display:flex;align-items:center;gap:14px;color:var(--muted);font-size:14px;white-space:nowrap}.topbar-location strong{font-weight:500;color:var(--text)}.topbar-divider{height:17px;width:1px;background:var(--border);margin:0 2px}.breadcrumb-slash{color:#c3c9c6}.topbar-tools{display:flex;align-items:center;gap:17px}.topbar select{font-size:13px;border-radius:5px;padding:6px 23px 6px 10px;background:var(--hover)}.date-label{color:var(--muted);font-size:13px}.avatar{width:29px;height:29px;display:grid;place-items:center;background:#eaece3;border-radius:50%;font-size:14px;color:#60715b;font-weight:650}.main-content{padding:34px 38px 45px;max-width:1600px;margin:auto;min-height:calc(100vh - 150px)}.site-footer{display:flex;justify-content:space-between;border-top:1px solid var(--border);color:var(--muted);padding:20px 38px;font-size:12px;gap:20px}.mobile-menu,.mobile-close,.mobile-only{display:none}.dashboard-intro{display:flex;align-items:center;justify-content:space-between;margin-bottom:28px;gap:20px}.dashboard-intro h1{font-size:28px;margin-bottom:7px}.dashboard-intro p{color:var(--muted);font-size:14px;margin-bottom:0}.eyebrow{font-size:12px;font-weight:600;letter-spacing:1.7px;color:var(--muted);margin-bottom:9px}.dashboard-grid{display:grid;grid-template-columns:minmax(0,1fr) 258px;gap:25px}.dashboard-primary,.dashboard-secondary{min-width:0}.dashboard-secondary{display:flex;flex-direction:column;gap:22px}.page-title{display:flex;justify-content:space-between;align-items:center;gap:24px;margin:4px 0 30px}.page-title p{font-size:15px;color:var(--muted);margin:0;max-width:750px}.results-grid,.settings-grid{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:24px;margin:24px 0}.lesson-layout{display:grid;grid-template-columns:minmax(0,820px) 190px;gap:55px;justify-content:space-between}.lesson-toc{position:sticky;top:30px;align-self:start}.practice-layout{max-width:920px;margin:0 auto}.panel{background:var(--panel);border:1px solid var(--border);border-radius:9px;box-shadow:var(--shadow);overflow:hidden}.panel+.panel{margin-top:22px}.results-grid .panel+.panel,.settings-grid .panel+.panel,.dashboard-secondary .panel+.panel{margin-top:0}}@layer components{.button{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:40px;border-radius:6px;padding:9px 16px;font-size:14px;font-weight:550;line-height:1.5;white-space:nowrap;border:1px solid transparent}.button.primary{background:#176b59;color:#fff}.button.primary:hover{background:#105744}.button.secondary{background:var(--panel);border-color:var(--border);color:var(--text)}.button.secondary:hover{border-color:#a5b6ab;background:var(--hover)}.button.quiet{color:var(--muted)}.button.danger{background:var(--panel);color:var(--red);border-color:var(--red)}.full{width:100%}.icon-button{padding:5px;display:inline-flex;border-radius:4px}.text-link{display:inline-flex;align-items:center;gap:5px;color:var(--green);font-size:14px}.text-link:hover{text-decoration:underline}.text-button{display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--green);padding:0}.quiet-button{font-size:12px;color:var(--muted);padding:12px 0 0;display:block;margin:auto}.pill{display:inline-flex;border:1px solid var(--border);border-radius:4px;padding:1px 6px;color:var(--muted);font-size:12px;line-height:1.7;white-space:nowrap;font-weight:400}.pill.green{background:var(--green-soft);color:var(--green);border-color:transparent}.tiny-label{font-size:12px;letter-spacing:1px;color:var(--muted)}.tags{display:flex;gap:7px;flex-wrap:wrap}.section-head{padding:21px 23px 17px;display:flex;justify-content:space-between;align-items:center;gap:16px;border-bottom:1px solid var(--border)}.section-head>div{display:flex;align-items:center;gap:11px;flex-wrap:wrap}.section-head h2{font-size:18px;margin:0}.section-index{font-size:12px;color:#9ba59f;font-variant-numeric:tabular-nums;letter-spacing:1px}.subtle{font-size:13px;color:var(--muted)}.compact{padding:22px}.compact h3{font-size:16px}.compact p{font-size:14px;color:var(--muted)}.mini-heading{display:flex;justify-content:space-between;align-items:start;color:var(--muted)}.mini-heading h3{color:var(--text)}.pad{padding:22px}.info-note{border-left:3px solid #b4cbbd;padding:14px 17px;background:var(--hover);color:var(--muted);font-size:14px;line-height:1.9;margin:22px 0}.info-note a{text-decoration:underline;color:var(--green)}.empty{padding:50px 25px;text-align:center;color:var(--muted);border:1px dashed var(--border);border-radius:8px;display:flex;flex-direction:column;align-items:center;gap:13px}.empty h3{color:var(--text);margin:0}.empty p{max-width:500px;font-size:15px}.fatal{padding:60px;max-width:900px;margin:auto}.progress-track{height:4px;background:var(--border);border-radius:5px;overflow:hidden}.progress-track>div{height:100%;background:#5c9278;border-radius:5px}.dot{width:6px;height:6px;display:inline-block;border-radius:50%;flex-shrink:0}.dot.green{background:var(--green)}.hero-panel{min-height:308px;border:1px solid #dce6dd;background:var(--hero);border-radius:9px;display:grid;grid-template-columns:1.02fr 1fr;padding:29px 27px;gap:15px;overflow:hidden}.hero-kicker{font-size:12px;color:var(--green);letter-spacing:1px;display:flex;gap:7px;align-items:center}.hero-kicker>span{height:5px;width:5px;background:#4d9676;border-radius:50%}.hero-copy h2{font-size:29px;line-height:1.55;font-weight:600;margin:15px 0 10px;letter-spacing:1px}.hero-copy p{color:#7b8a7d;font-size:13px;line-height:1.9;margin-bottom:19px}.hero-copy .button{font-size:13px}.hero-meta{display:flex;gap:14px;margin-top:20px;color:#8a968a;font-size:12px}.hero-meta>span{display:flex;gap:5px;align-items:center}.sentence-art{align-self:center;border:1px solid #ceddce;border-radius:6px;background:color-mix(in srgb,var(--panel) 65%,transparent);padding:19px 19px 0;transform:rotate(-3deg);box-shadow:8px 10px #dce6dc70;position:relative}.sentence-art:before{content:"";position:absolute;inset:0;background:linear-gradient(0deg,transparent 23px,#dae5da 24px,transparent 25px);background-size:100% 25px;opacity:.35;pointer-events:none}.art-label{font-size:12px;letter-spacing:1px;display:flex;justify-content:space-between;color:#94a18f;border-bottom:1px solid #dce4d9;padding-bottom:12px}.art-label>span{font-size:12px;white-space:nowrap;margin-left:8px}.art-sentence{font-family:Georgia,serif;font-size:23px;line-height:1.9;white-space:nowrap;margin:16px 0 20px;position:relative;letter-spacing:-.6px}.art-sentence span{padding-bottom:5px}.subject-mark{border-bottom:2px solid #85ad96}.verb-mark{border-bottom:2px solid #c8b485}.object-mark{border-bottom:2px solid #94a8b6}.art-annotations{display:flex;gap:19px;font-size:12px;margin:0 0 23px;color:#7e8a7b;position:relative}.art-annotations i{display:block;font-size:12px;letter-spacing:1px;font-style:normal}.art-bottom{border-top:1px solid #dce4d9;display:flex;justify-content:space-between;font-size:12px;padding:11px 0;color:#8d9789;position:relative}.art-bottom>span{font-size:18px;line-height:1}.metrics{display:grid;grid-template-columns:repeat(4,1fr);margin:23px 0;background:var(--panel);border:1px solid var(--border);border-radius:8px;padding:19px 0;overflow:hidden}.metrics>div{padding:0 20px;border-right:1px solid var(--border);min-width:0}.metrics>div:last-child{border:0}.metrics>div>span{font-size:12px;color:var(--muted)}.metrics strong{font-size:28px;font-weight:600;letter-spacing:-1px;display:block;line-height:1.7;white-space:nowrap}.metrics strong small{font-size:12px;color:var(--muted);letter-spacing:0;margin-left:7px;font-weight:400}.metrics .progress-track{margin-top:5px}.metric-note{font-size:12px;color:var(--muted)}.diagnostic-card{padding:23px 22px;background:var(--panel);border:1px solid var(--border);border-radius:8px;text-align:center}.diagnostic-card .tiny-label{font-size:12px;letter-spacing:.5px}.diagnostic-symbol{height:60px;width:60px;border:1px solid #d7e5db;border-radius:50%;display:grid;place-items:center;margin:21px auto;color:var(--green);background:radial-gradient(circle,var(--green-soft) 54%,transparent 55%)}.diagnostic-card h2{font-size:19px;margin-bottom:10px}.diagnostic-card p{font-size:13px;color:var(--muted);line-height:1.95;text-align:left;margin-bottom:21px}.diagnostic-card .button{font-size:13px}.goal-card{padding:22px;background:#f3f1e9;border:1px solid #e7e3d7;border-radius:8px;color:#6d7058}.goal-title{display:flex;align-items:center;justify-content:space-between;font-size:13px}.goal-title .pill{color:#8b8d76;border-color:#dcdacb}.goal-card>strong{font-family:Georgia,serif;font-size:51px;font-weight:400;line-height:1.7;display:block;color:#505b44}.goal-card>strong small{font-size:14px;font-family:inherit;padding-left:8px}.goal-card p{font-size:12px;color:#949680;margin:0}.goal-rule{border-top:1px solid #dfddce;margin:17px 0 13px}.goal-card>.muted{font-size:12px;line-height:1.9;color:#989a86}.compact blockquote{margin:13px 0;font-size:16px;font-family:Georgia,Microsoft YaHei,serif;line-height:1.9}.compact blockquote+p{font-size:12px;line-height:1.9;margin-bottom:0}.privacy-note{display:flex;gap:7px;padding:0 8px;color:#94a097;font-size:12px}.privacy-note p{margin:0}.privacy-note a{text-decoration:underline}.learning-panel{margin-bottom:24px}.path-label{display:flex;align-items:center;gap:8px;padding:20px 24px 7px;font-size:13px}.path-label small{font-size:12px;color:var(--muted);margin-left:auto}.lesson-row{display:flex;align-items:center;gap:13px;padding:18px 23px;border-bottom:1px solid var(--border);min-width:0}.lesson-row:hover{background:var(--hover)}.lesson-row:last-child{border-bottom:0}.lesson-number{font-size:13px;align-self:center;color:#8a9990;width:26px;font-variant-numeric:tabular-nums}.lesson-row-main{min-width:0;flex:1}.lesson-row-main strong{font-weight:550;font-size:14px;display:block}.lesson-row-main small{font-size:12px;color:var(--muted);display:block;margin-top:4px}.status{font-size:12px;color:var(--muted);white-space:nowrap;min-width:36px}.status.positive{color:var(--green)}.lesson-row>svg{color:#9aa69e}.learning-tip{display:flex;gap:7px;align-items:center;border-top:1px solid var(--border);padding:12px 23px;font-size:12px;color:var(--muted);background:var(--hover)}.review-callout{margin:17px 22px 0;padding:15px;display:flex;gap:11px;align-items:center;border:1px solid #d7e7dc;background:var(--green-soft);border-radius:6px;color:var(--green)}.review-callout strong{font-size:14px;font-weight:500}.review-callout small{display:block;font-size:12px;color:var(--muted)}.review-callout>svg:last-child{margin-left:auto}.exam-paths>.section-head{padding:1px 0 16px;border:0}.exam-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:13px}.exam-grid>a{background:var(--panel);border:1px solid var(--border);border-radius:7px;padding:20px 18px;position:relative}.exam-grid>a:hover{border-color:#a6c3af}.exam-icon{display:flex;width:32px;height:32px;align-items:center;justify-content:center;border-radius:7px;margin-bottom:13px}.exam-icon.blue{background:#edf2f7;color:#6d8b9f}.exam-icon.green{background:#edf4ef;color:#658673}.exam-icon.sand{background:#f7f2e7;color:#a69169}.exam-grid .tiny-label{font-size:12px;letter-spacing:.6px}.exam-grid h3{font-size:14px;margin-top:6px;margin-bottom:8px;white-space:normal}.exam-grid p{font-size:12px;line-height:1.9;color:var(--muted);margin-bottom:17px}.exam-grid .text-link{font-size:12px}.weak-link{display:block;font-size:14px;margin-top:14px}.weak-link small{display:block;color:var(--muted);margin-top:4px}.map-intro{display:flex;justify-content:space-between;gap:20px;align-items:center;padding:23px;background:var(--green-soft);border:1px solid var(--border);border-radius:8px;margin-bottom:24px}.map-intro strong{font-size:17px}.map-intro p{margin:8px 0 0;font-size:14px;color:var(--muted)}.filter-bar{display:flex;gap:17px;align-items:center;flex-wrap:wrap;padding:17px 0}.filter-bar label{display:flex;gap:9px;align-items:center;font-size:13px;color:var(--muted)}.filter-bar select{max-width:260px;font-size:13px;padding:8px}.search-field{flex:1;min-width:220px;position:relative}.search-field svg{position:absolute;left:12px}.search-field input{width:100%;padding-left:37px;font-size:14px}.check-label{display:inline-flex;gap:8px;align-items:center;white-space:nowrap;font-size:13px}.list-summary{display:flex;justify-content:space-between;font-size:13px;color:var(--muted);margin:9px 0 19px;gap:20px}.module-panel{margin-bottom:20px}.module-heading{width:100%;display:flex;align-items:center;gap:22px;text-align:left;padding:22px 25px}.module-heading:hover{background:var(--hover)}.module-index{font-family:Georgia,serif;font-size:30px;color:#95b09d;border:1px solid var(--border);width:57px;height:62px;display:grid;place-items:center;border-radius:6px}.module-title{flex:1}.module-title .tiny-label{font-size:12px}.module-title h2{font-size:18px;margin:2px 0 3px}.module-title small{font-size:13px;color:var(--muted)}.module-completion{width:100px;font-size:14px;color:var(--muted);text-align:right}.module-completion .progress-track{margin-top:8px}.module-heading>svg{transition:transform .2s}.rotated{transform:rotate(-90deg)}.module-lessons{border-top:1px solid var(--border)}.module-lessons>div+div{border-top:1px solid var(--border)}.module-lessons .lesson-row{border:0;padding-bottom:9px}.prerequisite-line{padding:0 25px 14px 64px;display:flex;gap:12px;align-items:center;flex-wrap:wrap;font-size:12px;color:var(--muted)}.prerequisite-line .text-link{font-size:12px}.module-exams{margin-left:auto;font-size:12px}.back-link{display:inline-flex;align-items:center;gap:7px;font-size:14px;color:var(--muted);margin-bottom:20px}.back-link:hover{color:var(--green)}.lesson-header{padding:12px 0 29px;border-bottom:1px solid var(--border);margin-bottom:32px}.lesson-header h1{font-size:34px}.english-title{font-family:Georgia,serif;font-size:22px;color:var(--muted);margin-bottom:16px}.lesson-meta{display:flex;gap:14px;align-items:center;flex-wrap:wrap;font-size:13px;color:var(--muted)}.lesson-article section{padding-bottom:25px;margin-bottom:24px;border-bottom:1px solid var(--border);scroll-margin-top:25px}.section-label{font-size:12px;letter-spacing:1.5px;color:var(--muted);margin-bottom:9px}.lesson-article h2{font-size:22px;margin-bottom:22px}.lesson-article p{font-size:16px;line-height:1.95}.objectives{list-style:none;padding:0}.objectives li{display:flex;align-items:start;gap:10px}.objectives svg{margin-top:5px;color:var(--green)}.prerequisites{display:flex;align-items:center;gap:14px;flex-wrap:wrap;padding:16px;background:var(--green-soft);border-radius:5px;margin-top:22px;font-size:14px}.rule-block{display:flex;gap:17px;margin:18px 0}.rule-block>span{display:grid;place-items:center;width:24px;height:24px;flex-shrink:0;border-radius:50%;background:var(--green-soft);color:var(--green);font-size:13px;margin-top:4px}.rule-block p{margin:0}.example-block{padding:24px 26px;margin-bottom:18px;background:var(--panel);border:1px solid var(--border);border-radius:8px}.example-number{font-size:12px;letter-spacing:1px;color:#91a298}.example-block .example-en{font-family:Georgia,Times New Roman,serif;font-size:22px;margin:10px 0 8px;line-height:1.65;color:var(--text)}.example-block .example-zh{font-size:15px;color:var(--muted);margin-bottom:16px}.structure{border-top:1px dashed var(--border);padding-top:12px}.structure>span{font-size:12px;color:var(--green)}.structure 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