:root{--bg:#f1f5f7;--panel:#fff;--ink:#142b3b;--muted:#526a79;--line:#dce5eb;--navy:#0c2233;--accent:#e9952e;--soft:#eaf2f6;--green:#176d57;--shadow:0 8px 30px #122c3b08;color-scheme:light;font-family:Tahoma,'Arial',sans-serif;font-size:16px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);line-height:1.85}body.dark{--bg:#0c1923;--panel:#132734;--ink:#e9f1f5;--muted:#adbec9;--line:#304653;--soft:#1c3544;--green:#87dcc3;--shadow:none;color-scheme:dark}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button,a,input,select{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #d78424;outline-offset:4px}h1,h2,h3,p{margin:0}h1{font-size:2.45rem;line-height:1.5;letter-spacing:-.05em}h2{font-size:1.5rem;line-height:1.6}h3{font-size:1.13rem;line-height:1.7}p{margin-top:.65rem}.topbar{background:var(--panel);border-bottom:1px solid var(--line);padding:17px max(5vw,20px);display:flex;gap:35px;align-items:center;position:sticky;top:0;z-index:20}.brand{display:flex;align-items:center;gap:12px;font-weight:bold;font-size:1.35rem;line-height:1.4}.brand small{display:block;color:var(--muted);font-size:.8rem;font-weight:normal;margin-top:3px}.brand-mark{background:var(--navy);color:#ffb656;width:46px;height:46px;display:grid;place-items:center;border-radius:12px;font-size:1.7rem}.topbar nav{display:flex;gap:25px;flex:1;font-size:.92rem;font-weight:bold}.topbar nav a{padding:5px 0;border-bottom:2px solid transparent}.topbar nav a.active{border-color:var(--accent);color:var(--ink)}.icon-btn{border:1px solid var(--line);padding:7px 12px;background:var(--panel);color:var(--ink);border-radius:8px;font-size:.85rem}main{max-width:1240px;margin:auto;padding:36px 30px 60px;min-height:70vh}.eyebrow{font-size:.85rem;font-weight:bold;color:var(--muted);margin-bottom:7px}.page-head{display:flex;justify-content:space-between;gap:28px;align-items:center;margin-bottom:27px}.page-head p{color:var(--muted);max-width:660px}.label{background:var(--soft);color:var(--ink);border-radius:5px;font-size:.8rem;padding:3px 9px;display:inline-block}.search{display:flex;background:var(--panel);border:1px solid var(--line);border-radius:10px;overflow:hidden;max-width:480px;width:100%;align-items:center}.search input{border:0;outline:none;background:transparent;color:var(--ink);padding:11px 15px;width:100%;min-width:0;font-size:.9rem}.search button{border:0;padding:10px 18px;background:var(--navy);color:#fff;align-self:stretch;font-size:.9rem}.search input:focus{box-shadow:inset 0 0 0 2px var(--accent)}.home-intro{display:grid;grid-template-columns:1.35fr 1fr;gap:28px;margin-bottom:30px}.intro-copy{padding:27px 29px;background:var(--navy);border-radius:16px;color:white;background-image:linear-gradient(120deg,#173e53,#0c2233);position:relative;overflow:hidden}.intro-copy .eyebrow{color:#c2d6e2}.intro-copy h1{font-size:2.15rem;letter-spacing:-.04em;max-width:550px}.intro-copy p{color:#d1dee5;margin-bottom:18px;font-size:.95rem}.intro-copy .search{border:0}.intro-copy .search input{background:white;color:#142b3b}.intro-copy .search button{background:#e9952e;color:#132b3b;font-weight:bold}.quick-card{background:var(--panel);border:1px solid var(--line);border-radius:16px;display:grid;grid-template-columns:1fr 150px;overflow:hidden}.quick-card .copy{padding:23px}.quick-card h2{margin:9px 0 6px;font-size:1.2rem}.quick-card img{width:100%;height:100%;object-fit:cover}.quick-card p{color:var(--muted);font-size:.88rem}.button{background:var(--navy);color:#fff;border:1px solid var(--navy);border-radius:8px;padding:9px 17px;display:inline-flex;align-items:center;justify-content:center;gap:8px;font-size:.9rem;font-weight:bold;line-height:1.7}.button.secondary{background:var(--panel);border-color:var(--line);color:var(--ink)}.button.accent{background:#e9952e;color:#132b3b;border-color:#e9952e}.button.done{background:var(--green);border-color:var(--green);color:var(--panel)}.quick-card .button{margin-top:14px}.section-head{display:flex;justify-content:space-between;align-items:center;gap:16px;margin:27px 0 18px}.section-head small{font-size:.86rem;color:var(--muted)}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:23px}.unit-card{border:1px solid var(--line);border-radius:13px;overflow:hidden;background:var(--panel);box-shadow:var(--shadow);transition:transform .2s,border-color .2s}.unit-card:hover{transform:translateY(-3px);border-color:#9bb0bc}.unit-image{position:relative;height:175px;background:white;overflow:hidden}.unit-image img{width:100%;height:100%;object-fit:cover}.unit-image .unit-number{position:absolute;right:15px;top:13px;color:white;background:var(--unit);padding:2px 12px;border-radius:6px;font-size:.8rem;font-weight:bold;box-shadow:0 3px 15px #0002}.unit-body{padding:20px 22px}.unit-body .period{font-size:.8rem;color:var(--muted);margin-bottom:5px}.unit-body h3{min-height:61px}.unit-body p{color:var(--muted);font-size:.9rem;margin-top:5px}.card-bottom{border-top:1px solid var(--line);padding-top:12px;margin-top:15px;display:flex;align-items:center;justify-content:space-between;font-size:.83rem}.card-bottom b{color:var(--unit)}.progress{height:5px;border-radius:5px;background:var(--line);margin-top:12px;overflow:hidden}.progress span{height:100%;background:var(--unit,var(--accent));display:block}.tools-row{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:26px}.tool-card{padding:20px;background:var(--panel);border:1px solid var(--line);border-radius:11px;display:flex;gap:16px;align-items:center}.tool-number{font:700 1.6rem Arial;color:#b46b19}.tool-card small{display:block;color:var(--muted);font-size:.85rem}.local-note{color:var(--muted);font-size:.8rem;margin-top:17px}.breadcrumbs{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:.85rem;color:var(--muted);margin-bottom:20px}.breadcrumbs a{border-bottom:1px solid var(--line)}.unit-header{display:grid;grid-template-columns:1.5fr 1fr;background:var(--panel);border:1px solid var(--line);border-radius:16px;overflow:hidden;margin-bottom:25px}.unit-header .copy{padding:30px}.unit-header h1{font-size:2rem;margin-top:10px}.unit-header .unit-cover{height:100%;min-height:240px;width:100%;object-fit:cover}.unit-header p{color:var(--muted)}.goal-list{margin:14px 0 0;padding-right:20px;color:var(--muted);font-size:.95rem}.unit-meta{display:flex;gap:10px;flex-wrap:wrap;margin-top:15px}.lesson-list{display:grid;grid-template-columns:1fr 1fr;gap:17px}.lesson-list-item{padding:22px;background:var(--panel);border:1px solid var(--line);border-radius:11px;display:flex;gap:18px;align-items:flex-start}.lesson-index{font:700 1.4rem Arial;color:var(--muted);border:1px solid var(--line);border-radius:8px;padding:8px 12px;background:var(--soft)}.lesson-list-item h3{margin-bottom:3px}.lesson-list-item p{font-size:.9rem;color:var(--muted)}.lesson-list-item:hover{border-color:var(--accent)}.lesson-list-item .status{font-size:.8rem;color:var(--green)}.unit-reference{font-size:.85rem;color:var(--muted);margin-top:24px;border-top:1px solid var(--line);padding-top:16px}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 285px;gap:28px;align-items:start}.lesson-main{background:var(--panel);border:1px solid var(--line);border-radius:13px;padding:32px;min-width:0}.lesson-main h1{font-size:2rem;margin:8px 0}.lesson-aim{font-size:1rem;color:var(--muted);margin:0 0 20px}.lesson-photo{margin:22px 0;background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden}.photo-button{display:block;border:0;background:white;width:100%;padding:0;cursor:zoom-in}.photo-button img{width:100%;max-height:350px;object-fit:contain;display:block}.lesson-photo figcaption{background:var(--soft);color:var(--muted);padding:9px 15px;font-size:.8rem;line-height:1.8}.content-section{margin:25px 0;scroll-margin-top:110px}.content-section h2{font-size:1.24rem;margin-bottom:9px}.content-section p{color:var(--ink);line-height:2.05}.content-section h2:before{content:'';display:inline-block;width:5px;height:20px;background:var(--accent);margin-left:10px;border-radius:2px;vertical-align:middle}.example,.activity,.formula-box{border:1px solid var(--line);border-radius:10px;margin:23px 0;padding:21px 23px}.example{background:var(--soft);border-right:4px solid #31889d}.example .eyebrow{color:var(--muted)}.example h3{margin-top:4px}.activity{border-right:4px solid var(--accent)}.formula-box code{display:block;direction:ltr;text-align:center;font:600 1.2rem 'Courier New',monospace;white-space:normal;overflow-wrap:anywhere;background:var(--navy);color:white;border-radius:7px;padding:16px}.formula-box p{font-size:.88rem;color:var(--muted)}.lesson-sidebar{position:sticky;top:107px}.sidebar-box{background:var(--panel);border:1px solid var(--line);border-radius:11px;padding:20px;margin-bottom:16px}.sidebar-box h3{font-size:1rem;margin-bottom:13px}.sidebar-box a.lesson-link{display:block;font-size:.88rem;border-bottom:1px solid var(--line);padding:11px 0;line-height:1.8}.sidebar-box a.lesson-link:last-child{border-bottom:0}.sidebar-box a.selected{color:#c17b23;font-weight:bold}.sidebar-box .button{width:100%;margin-top:9px}.sidebar-box p{font-size:.82rem;color:var(--muted)}.term-chips{display:flex;flex-wrap:wrap;gap:8px}.term-chip{font-size:.8rem;border:1px solid var(--line);border-radius:5px;padding:3px 9px;background:var(--soft)}.lesson-end{display:flex;gap:12px;flex-wrap:wrap;margin-top:25px}.quiz{margin-top:25px;scroll-margin-top:110px}.quiz-card{border:1px solid var(--line);background:var(--panel);padding:23px;border-radius:11px;margin-bottom:15px}.quiz-card .quiz-label{color:var(--muted);font-size:.8rem;margin-bottom:8px}.quiz-card h3{font-size:1rem;margin-bottom:14px}.quiz-options{display:grid;gap:9px}.quiz-option{border:1px solid var(--line);color:var(--ink);background:var(--bg);padding:10px 13px;text-align:right;border-radius:7px;font-size:.95rem;line-height:1.9}.quiz-option:not(:disabled):hover{border-color:var(--accent);background:var(--soft)}.quiz-option.correct{border-color:#257b5f;background:#e8f6ef;color:#16513e}.quiz-option.wrong{border-color:#b64c43;background:#fff0ee;color:#7e2e26}.quiz-feedback{margin-top:15px;font-size:.92rem;color:var(--ink)}.quiz-feedback strong{display:block}.quiz-feedback[hidden]{display:none}.quiz-summary{padding:17px 21px;background:var(--soft);border-radius:8px;margin:18px 0;font-size:.9rem}.quiz-score{font-weight:bold}.filters{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:24px}.filters input,.filters select{border:1px solid var(--line);border-radius:9px;background:var(--panel);color:var(--ink);padding:11px 14px;font-size:.9rem;max-width:100%}.filters input{flex:1;min-width:200px}.filters select{max-width:300px}.equipment-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}.equipment-card{border:1px solid var(--line);background:var(--panel);border-radius:12px;overflow:hidden}.equipment-card .photo-button img{height:180px;object-fit:contain;padding:10px}.equipment-card .info{padding:20px}.equipment-card .english{font:.8rem Arial;color:var(--muted);margin-top:5px}.equipment-card p,.equipment-card li{font-size:.9rem}.equipment-card .info>p{color:var(--muted)}.equipment-card details{margin-top:12px;border-top:1px solid var(--line);padding-top:10px}.equipment-card summary{cursor:pointer;font-size:.9rem;font-weight:bold}.equipment-card ul{padding-right:20px}.equipment-card .equipment-source{font-size:.76rem;color:var(--muted);padding-top:12px}.equipment-card .equipment-source a{text-decoration:underline}.glossary-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.term-entry{border:1px solid var(--line);background:var(--panel);border-radius:10px;padding:21px}.term-entry .english{font:.9rem Arial;color:var(--muted);margin:5px 0 9px;display:block}.term-entry p{font-size:.95rem}.term-entry .unit-tag{font-size:.8rem;color:var(--muted);margin-top:10px;display:inline-block}.empty{border:1px dashed var(--line);border-radius:12px;padding:45px;text-align:center;grid-column:1/-1;color:var(--muted)}.result-list{display:grid;gap:13px}.result{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:21px}.result small{color:var(--muted)}.result h3{margin:3px 0}.result p{font-size:.9rem;color:var(--muted)}.result:hover{border-color:var(--accent)}.source-panel{padding:30px;background:var(--panel);border:1px solid var(--line);border-radius:13px;max-width:900px}.source-panel h2{font-size:1.2rem;margin-top:23px}.source-panel p,.source-panel li{font-size:.95rem}.source-panel ul{padding-right:22px}footer{border-top:1px solid var(--line);background:var(--panel);padding:25px max(5vw,20px);display:flex;gap:25px;align-items:center;flex-wrap:wrap;font-size:.8rem;color:var(--muted)}footer b{color:var(--ink);font-size:.9rem}footer span{flex:1;min-width:200px}footer a{text-decoration:underline}dialog{border:1px solid var(--line);background:var(--panel);color:var(--ink);padding:20px;border-radius:12px;max-width:95vw;max-height:92vh;width:950px}dialog::backdrop{background:#081926dd}dialog img{max-width:100%;max-height:72vh;display:block;object-fit:contain;margin:auto;background:white}dialog button{border:1px solid var(--line);background:var(--panel);color:var(--ink);padding:6px 15px;margin-bottom:12px;border-radius:6px}dialog p{font-size:.9rem;color:var(--muted)}#notice{position:fixed;bottom:25px;left:25px;background:var(--navy);color:white;padding:12px 20px;border-radius:8px;z-index:40;max-width:90vw;display:none;font-size:.9rem}#notice.show{display:block}.steps{padding-right:25px}.steps li{margin:5px 0}.body-count{font-size:.85rem;color:var(--muted);margin-bottom:15px}.print-btn{margin-top:15px}@media(min-width:1500px){main{max-width:1320px}}@media(max-width:1020px){.home-intro{grid-template-columns:1fr 1fr}.quick-card{grid-template-columns:1fr}.quick-card img{display:none}.grid,.equipment-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.lesson-layout{grid-template-columns:minmax(0,1fr) 245px}.topbar{gap:20px}.topbar nav{gap:18px}.tools-row{gap:12px}.tool-card{padding:15px;gap:10px}}@media(max-width:760px){main{padding:25px 18px 40px}.topbar{padding:12px 18px;gap:10px;flex-wrap:wrap}.brand{font-size:1.1rem;flex:1}.brand-mark{height:38px;width:38px;font-size:1.35rem}.brand small{font-size:.75rem}.topbar nav{order:3;flex-basis:100%;justify-content:space-between;gap:10px;font-size:.85rem}.icon-btn{font-size:.78rem}.home-intro{grid-template-columns:1fr;gap:15px}.intro-copy{padding:24px}.intro-copy h1{font-size:1.85rem}.quick-card{display:block}.quick-card .copy{padding:20px}.quick-card h2{font-size:1.1rem}.quick-card .button{margin-top:10px}.page-head{display:block}.page-head h1{font-size:1.9rem}.page-head .search{margin-top:17px}.grid,.equipment-grid,.glossary-grid,.lesson-list{grid-template-columns:1fr}.unit-image{height:200px}.unit-body h3{min-height:0}.tools-row{grid-template-columns:1fr}.tool-card{padding:17px}.section-head{align-items:flex-start}.section-head h2{font-size:1.3rem}.unit-header{grid-template-columns:1fr}.unit-header .unit-cover{height:190px;min-height:0;grid-row:1}.unit-header .copy{padding:23px}.unit-header h1{font-size:1.7rem}.lesson-layout{display:flex;flex-direction:column}.lesson-main{padding:23px;width:100%}.lesson-main h1{font-size:1.75rem}.lesson-sidebar{position:static;width:100%;order:2}.sidebar-box{padding:20px}.content-section p{line-height:2.1}.example,.activity,.formula-box{padding:17px}.filters input{min-width:0;flex-basis:100%}.filters select{width:100%;max-width:none}.quiz-card{padding:19px}.equipment-card .photo-button img{height:220px}.source-panel{padding:23px}footer{gap:12px}.lesson-end .button{flex:1;font-size:.85rem}}@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}@media print{.topbar,footer,.lesson-sidebar,.lesson-end,.quiz,.print-btn{display:none!important}body,main,.lesson-main{background:#fff!important;color:#000!important}main{padding:0}.lesson-layout{display:block}.lesson-main{border:0;padding:0}.content-section,.example,.activity,.formula-box{break-inside:avoid}.photo-button img{max-height:230px}.lesson-photo{break-inside:avoid}}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}