:root{color:#253a50;font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;--navy:#18344c;--muted:#7b8b99;--line:#e6edf1;--green:#eaf5ef;background:#fff;font-family:Inter,PingFang SC,Microsoft YaHei,system-ui,sans-serif;font-size:14px;font-weight:400}*{box-sizing:border-box}body{margin:0}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,summary:focus-visible{outline-offset:4px;outline:3px solid #75ad97}button{color:inherit}svg{flex-shrink:0}[hidden]{display:none!important}.app-layout{min-height:100vh}.sidebar{border-right:1px solid var(--line);background:#f5f8fa;flex-direction:column;width:302px;padding:32px 18px 20px;display:flex;position:fixed;inset:0 auto 0 0}.brand{align-items:center;gap:12px;padding:0 12px 34px;display:flex}.brand-icon{background:var(--navy);color:#e6f2ef;border-radius:12px;place-items:center;width:42px;height:44px;display:grid}.brand-icon svg{width:24px;height:24px}.brand strong{letter-spacing:.5px;color:var(--navy);font-size:18px;display:block}.brand small{letter-spacing:1.15px;color:var(--muted);margin-top:6px;font-size:9px;display:block}.directory-label{color:var(--muted);letter-spacing:.6px;justify-content:space-between;padding:0 14px 18px;font-size:11px;display:flex}.directory-nav{scrollbar-width:thin;scrollbar-color:#dbe4e9 transparent;flex:1;overflow:auto}.category-group{margin-bottom:19px}.category-toggle{text-align:left;color:#294157;background:0 0;border:0;align-items:center;gap:9px;width:100%;padding:8px 9px;font-size:13px;font-weight:650;display:flex}.chevron{width:13px;height:13px;transition:transform .15s}.chevron.expanded{transform:rotate(90deg)}.chapter-list{padding-top:5px}.chapter-link{color:#6d7d8a;border-radius:7px;align-items:flex-start;gap:11px;margin:2px 0;padding:11px 12px 11px 28px;font-size:12px;line-height:1.7;transition:background .15s,color .15s;display:flex}.chapter-link:hover{color:var(--navy);background:#eaf0f4}.chapter-link.active{color:#183e59;background:#e3edf4;font-weight:600}.chapter-dot{background:#bbc9d2;border-radius:50%;flex-shrink:0;width:5px;height:5px;margin-top:8px}.active .chapter-dot{background:#396982;box-shadow:0 0 0 3px #d2e1ea}.sidebar-note{color:#63917e;border-top:1px solid #e1e9ed;gap:10px;margin-top:15px;padding:18px 10px 0;display:flex}.sidebar-note strong{color:#526f65;font-size:11px;font-weight:500;display:block}.sidebar-note span{color:#92a29d;margin-top:6px;font-size:10px;display:block}.main-panel{margin-left:302px}.topbar{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:16px;height:76px;padding:0 44px;display:flex}.breadcrumbs{color:var(--muted);align-items:center;gap:12px;font-size:12px;display:flex}.breadcrumbs>svg:first-child{color:#8295a4;width:17px;height:17px}.breadcrumbs>svg:nth-of-type(2){color:#bdc8cf;width:11px;height:11px}.breadcrumbs>span:last-child{color:#506778}.language-badge{color:#548171;white-space:nowrap;background:#edf6f1;border-radius:6px;align-items:center;gap:8px;padding:7px 10px;font-size:10px;font-weight:600;display:flex}.language-badge span{border-left:1px solid #d4e6dc;padding-left:8px;font-weight:400}.chapter-content{max-width:930px;margin:0 auto;padding:56px 56px 26px}.chapter-kicker{letter-spacing:.6px;color:#698799;justify-content:space-between;align-items:center;gap:12px;font-size:11px;display:flex}.chapter-position{color:#9aa7b1;letter-spacing:1px;white-space:nowrap;font-size:10px}h1{letter-spacing:-.6px;color:var(--navy);overflow-wrap:anywhere;margin:15px 0 14px;font-size:30px;font-weight:650;line-height:1.5}.chapter-metadata{color:#85939f;align-items:center;gap:8px;font-size:11px;display:flex}.green-dot{background:#7da992;border-radius:50%;width:6px;height:6px}.meta-divider{background:#d8e2e8;width:1px;height:10px;margin:0 5px}.chapter-body{margin-top:35px}.text-block{overflow-wrap:anywhere;font-size:14px;line-height:1.95}.text-block p{white-space:pre-wrap;margin:0}.text-rule{color:#365a4d;background:#edf6f1;border:1px solid #dcece2;border-left:3px solid #87b59e;border-radius:0 8px 8px 0;margin:0 0 24px;padding:18px 22px}.text-note{color:#5a7083;background:#f4f7fa;border-radius:7px;margin-top:20px;padding:16px 20px}.text-summary,.text-review{color:#526d61;background:#f3f7f5;border-radius:7px;margin-top:20px;padding:16px 20px}.text-explanation{margin-bottom:20px}.source-spacer{height:9px}.word-table-wrapper{border:1px solid #e1e9ee;border-radius:9px;margin:24px 0 8px;overflow:hidden}.word-table{border-collapse:collapse;table-layout:fixed;text-align:left;width:100%;font-size:13px}.word-table th{color:#75899a;background:#f3f7fa;border-bottom:1px solid #e2eaf0;padding:15px 22px;font-size:11px;font-weight:500}.word-table th:first-child{width:27%}.word-table th:nth-child(2){width:32%}.word-table td{color:#627486;overflow-wrap:anywhere;border-bottom:1px solid #edf1f4;padding:17px 22px;line-height:1.55}.word-table tr:last-child td{border-bottom:0}.word-table tbody tr:nth-child(2n){background:#fbfcfd}.word-table tbody tr:hover{background:#f4f9f7}.english-word{letter-spacing:.1px;color:#233f56;font-size:16px;font-weight:600}.ipa{color:#56758a;letter-spacing:.2px;font-family:DejaVu Sans,Arial,sans-serif;font-size:14px}.chapter-pagination{border-top:1px solid var(--line);grid-template-columns:1fr 1fr;gap:18px;margin-top:38px;padding-top:25px;display:grid}.chapter-pagination a{border:1px solid var(--line);border-radius:7px;align-items:center;gap:12px;min-width:0;padding:12px 14px;transition:background .15s;display:flex}.chapter-pagination a:hover{background:#f5f9fa;border-color:#cddce4}.chapter-pagination small{color:#94a2ad;margin-bottom:7px;font-size:10px;display:block}.chapter-pagination strong{color:#537185;font-size:11px;font-weight:500;line-height:1.6;display:block}.chapter-pagination svg{color:#7f97a6;width:15px}.previous-chapter>svg{transform:rotate(180deg)}.next-chapter{text-align:right;justify-content:flex-end}.source-introduction{border-top:1px solid var(--line);color:#8999a4;margin-top:32px;padding-top:20px;font-size:11px}.source-introduction summary{cursor:pointer;width:fit-content}.source-introduction[open] summary{margin-bottom:20px}.source-introduction .text-block{color:#7a8c99;font-size:12px}.page-footer{color:#a6b2ba;justify-content:space-between;gap:12px;max-width:930px;margin:0 auto;padding:25px 56px 32px;font-size:10px;display:flex}.mobile-header{display:none}.skip-link{z-index:10;background:#fff;padding:12px;position:fixed;top:8px;left:8px;transform:translateY(-160%)}.skip-link:focus{transform:translateY(0)}@media (width>=1500px){.chapter-content{padding-top:68px}.topbar{padding-left:64px;padding-right:64px}}@media (width<=1100px){.sidebar{width:266px;padding-left:12px;padding-right:12px}.main-panel{margin-left:266px}.chapter-content{padding:40px 32px 20px}.topbar{padding:0 32px}.page-footer{padding:25px 32px}.word-table th,.word-table td{padding-left:16px;padding-right:16px}h1{font-size:27px}}@media (width<=760px){.mobile-header{z-index:5;border-bottom:1px solid var(--line);background:#fff;justify-content:space-between;align-items:center;height:62px;padding:0 20px;display:flex;position:sticky;top:0}.mobile-header>span{color:var(--navy);align-items:center;gap:9px;font-size:14px;font-weight:600;display:flex}.mobile-header button{background:#f0f5f7;border:1px solid #e4ebef;border-radius:6px;align-items:center;gap:6px;padding:7px 9px;font-size:11px;display:flex}.mobile-header button svg{width:15px}.sidebar{border-bottom:1px solid var(--line);border-right:0;width:100%;max-height:65vh;padding:20px 14px;display:none;position:static}.sidebar.mobile-open{display:flex}.brand,.sidebar-note{display:none}.directory-label{padding-bottom:12px}.category-group{margin-bottom:12px}.chapter-link{padding-top:9px;padding-bottom:9px;font-size:13px}.main-panel{margin-left:0}.topbar{height:56px;padding:0 20px}.breadcrumbs{gap:7px;font-size:10px}.language-badge{padding:6px 8px;font-size:9px}.language-badge span{display:none}.chapter-content{padding:30px 20px 20px}.chapter-kicker{letter-spacing:0;font-size:10px}.chapter-position{letter-spacing:0;font-size:9px}h1{margin-top:13px;font-size:25px}.chapter-body{margin-top:26px}.text-block{font-size:13px}.text-rule{padding:16px}.text-note,.text-summary,.text-review{padding:14px 16px}.word-table th{padding:12px 10px;font-size:10px}.word-table td{padding:14px 10px;font-size:12px}.word-table th:first-child{width:25%}.word-table th:nth-child(2){width:34%}.english-word{font-size:14px}.ipa{letter-spacing:0;font-size:12px}.chapter-pagination{gap:10px;margin-top:28px}.chapter-pagination a{gap:6px;padding:10px}.chapter-pagination strong{font-size:10px}.page-footer{flex-wrap:wrap;padding:20px;font-size:9px}.source-introduction{margin-top:26px}}@media (prefers-reduced-motion:reduce){*{transition:none!important}}@media (width<=760px){.word-table th:first-child{width:30%}.word-table th:nth-child(2){width:34%}.word-table th,.word-table td{padding-left:8px;padding-right:8px}.english-word{overflow-wrap:normal;font-size:13px}}.search-field{color:#8a9ba8;background:#fff;border:1px solid #dce6ec;border-radius:7px;flex-shrink:0;align-items:center;gap:8px;margin:0 10px 22px;padding:9px 10px;display:flex}.search-field:focus-within{border-color:#8aaebd;box-shadow:0 0 0 3px #e7eff3}.search-field input{width:100%;min-width:0;font:inherit;color:var(--navy);background:0 0;border:0;outline:none;font-size:12px}.search-field input::placeholder{color:#93a3af}.search-field input::-webkit-search-cancel-button{-webkit-appearance:none}.search-field button{color:#718798;background:#eef3f6;border:0;border-radius:4px;padding:2px 5px;font-size:17px;line-height:1}.search-count{padding-bottom:12px}.search-result{background:#fff;border:1px solid #0000;border-radius:8px;margin-bottom:7px;padding:12px;display:block}.search-result:hover{background:#edf4f7;border-color:#dce7ed}.search-result:focus-visible{outline-offset:-3px}.search-result.in-current-chapter{border-color:#dbe7ed}.result-category{color:#8b9da9;margin-bottom:6px;font-size:10px;display:block}.search-result strong{color:#29485f;overflow-wrap:anywhere;font-size:12px;font-weight:600;line-height:1.7;display:block}.result-snippet{color:#738797;overflow-wrap:anywhere;margin-top:7px;font-size:11px;line-height:1.8;display:block}.search-empty{text-align:center;padding:28px 14px}.search-empty strong{color:#526d80;font-size:12px;font-weight:500}.search-empty p{color:#8b9da9;margin-top:10px;font-size:11px;line-height:1.9}mark{color:inherit;-webkit-box-decoration-break:clone;box-decoration-break:clone;background:#d9edc4;border-radius:2px;padding:0 1px}.chapter-content [id^=content-],#chapter-title{scroll-margin-top:85px}.chapter-content [id^=content-]:focus-visible{outline-offset:4px;outline:2px solid #85ad98}.search-field input:focus-visible{outline:none}@media (width<=760px){.search-field{margin-bottom:16px;padding:11px}.search-field input{font-size:16px}.search-result strong{font-size:13px}.result-snippet{font-size:12px}.search-field button{padding:5px 8px}}.word-with-pronunciation{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.pronunciation-control{align-items:center;gap:3px;display:inline-flex}.pronunciation-button{color:#6b9481;background:#f2f8f4;border:1px solid #deebe4;border-radius:6px;justify-content:center;align-items:center;width:28px;height:28px;padding:4px;display:inline-flex}.pronunciation-button:hover,.pronunciation-button.is-playing{color:#315f4b;background:#e0f0e7;border-color:#a9cdb8}.pronunciation-source{color:#8ba297;white-space:nowrap;font-size:9px}.pronunciation-help{border-top:1px solid var(--line);color:#779084;background:#f7faf8;padding:12px 18px;font-size:10px;line-height:1.8}.pronunciation-help p{margin:0}.pronunciation-status:empty{display:none}.pronunciation-status{color:#4d7461;overflow-wrap:anywhere;margin-top:8px}.pronunciation-error{color:#945a39}.pronunciation-status button{color:#537260;background:#fff;border:1px solid #cfded5;border-radius:4px;margin-left:8px;padding:3px 8px;font-size:10px}.recording-attribution{margin-top:4px;display:block}.recording-attribution a{text-underline-offset:2px;text-decoration:underline}@media (width<=760px){.word-with-pronunciation{gap:3px}.pronunciation-button{width:30px;height:30px}.pronunciation-source{font-size:8px}.pronunciation-help{padding:11px 12px;font-size:10px}}