@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Noto+Sans+SC:wght@400;500;600&display=swap');
:root{--bg:#f7f7f5;--ink:#242424;--muted:#92928e;--line:#e6e6e2}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:14px 'DM Sans','Noto Sans SC',sans-serif}button,input,select,textarea{font:inherit}button,a{color:inherit;cursor:pointer}a{text-decoration:none}button:focus-visible,a:focus-visible{outline:2px solid #777;outline-offset:4px}#sidebar{width:235px;height:100vh;position:fixed;padding:34px 22px 20px;background:#fbfbfa;border-right:1px solid var(--line);display:flex;flex-direction:column;z-index:30}.brand{display:flex;align-items:center;gap:7px;font-size:22px;font-weight:700;letter-spacing:-1px;padding:0 8px}.brand-icon{display:grid;place-items:center;background:#222;color:white;width:32px;height:34px;border-radius:8px;font:italic 29px Georgia;margin-right:3px}.brand-light{font-weight:400;color:#777}.workspace{display:flex;align-items:center;gap:10px;border:1px solid var(--line);border-radius:8px;margin:35px 0 32px;padding:11px 9px;font-size:11px}.workspace>span:last-child{margin-left:auto}.workspace small,.profile small{display:block;font-size:9px;color:var(--muted);margin-top:4px}.nav-label{font-size:10px;letter-spacing:2px;color:#999;margin:0 12px 13px}nav{display:flex;flex-direction:column;gap:5px}nav a{padding:12px 13px;display:flex;align-items:center;gap:13px;color:#777;border-radius:7px;font-size:12px}nav a:hover{background:#f0f0ed}nav a.active{background:#eaeae7;color:#222;font-weight:600}svg{width:18px;height:18px;stroke:currentColor;fill:none;stroke-width:1.5}.nav-extra{font-size:8px;border:1px solid #d2d2cd;padding:2px 5px;border-radius:4px;margin-left:auto;color:#777}.side-bottom{margin-top:auto}.side-quote{padding:25px 13px;color:#777;font:italic 20px/1.5 Georgia}.side-quote span{display:block;font:10px 'Noto Sans SC';margin-top:12px;color:#aaa;letter-spacing:1px}.profile{display:flex;align-items:center;gap:10px;border:0;border-top:1px solid var(--line);background:transparent;width:100%;text-align:left;padding:20px 4px 0;font-size:12px}.profile>span:last-child{margin-left:auto}.avatar{border:1px solid #d7d7d2;background:#eeeee9;border-radius:50%;width:34px;height:34px;display:grid;place-items:center;font-size:12px}.avatar.small{width:29px;height:29px;font-size:10px}.shell{margin-left:235px}header{height:76px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 42px;background:#fbfbfa}.breadcrumb{font-size:11px;color:#999}.breadcrumb span{padding:0 15px;color:#ccc}.breadcrumb b{color:#666;font-weight:400}.header-right{display:flex;gap:20px;align-items:center}.local-tag{font-size:10px;color:#999}.icon-button{background:none;border:0;font-size:19px;color:#777}.mobile-menu{display:none}main{max-width:1440px;margin:auto;padding:36px 42px 40px}.page-title-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:27px}.eyebrow{font-size:10px;letter-spacing:2px;color:#999;text-transform:uppercase}.page-title-row h1{font-size:26px;letter-spacing:-.8px;font-weight:600;margin:8px 0}.subtitle{font-size:11px;color:#999;margin:9px 0 0}.date-pill{border:1px solid var(--line);padding:9px 12px;border-radius:6px;font-size:10px;color:#888;background:#fbfbfa}.hero{background:#eaeae6;border:1px solid #e2e2dc;border-radius:11px;min-height:228px;position:relative;overflow:hidden;padding:29px 32px;display:flex;justify-content:space-between}.hero-copy{position:relative;z-index:2;max-width:70%}.hero .eyebrow{color:#888;font-size:9px}.hero h2{font-size:29px;font-weight:500;line-height:1.55;margin:14px 0 10px;letter-spacing:-1px}.hero p{font-size:11px;color:#888;line-height:1.9}.hero-actions{display:flex;align-items:center;gap:16px;margin-top:20px}.btn{border:1px solid #deded9;border-radius:6px;background:white;padding:10px 15px;font-size:11px;display:inline-flex;align-items:center;gap:13px;justify-content:center}.btn.dark{background:#282828;color:white;border-color:#282828}.btn:hover{filter:brightness(.94)}.text-link{border:0;background:none;font-size:11px;color:#888;padding:7px 0}.hero-art{position:absolute;right:10px;top:-18px;width:290px;height:280px;opacity:.7}.orb{position:absolute;left:60px;top:42px;width:170px;height:170px;border:1px solid #aaa;border-radius:50%;background:repeating-radial-gradient(ellipse at 30% 30%,transparent 0 9px,#babbb3 10px 10.6px,transparent 11px 16px);transform:rotate(-25deg)}.orbit{position:absolute;left:4px;top:65px;width:275px;height:130px;border:1px solid #aaa;border-radius:50%;transform:rotate(-38deg)}.orbit.two{transform:rotate(40deg);left:40px;width:205px}.star{position:absolute;right:32px;top:40px;color:#777;font-size:33px}.art-caption{position:absolute;right:37px;bottom:25px;font-size:8px;letter-spacing:3px;color:#888}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:21px 0 29px}.stat{padding:19px 20px;background:white;border:1px solid var(--line);border-radius:8px}.stat-top{display:flex;justify-content:space-between;color:#999;font-size:10px}.stat-top svg{width:15px;height:15px}.stat-value{font-size:28px;font-weight:500;margin:10px 0 7px}.stat-value small{font-size:11px;font-weight:400;color:#aaa;margin-left:5px}.stat-bottom{font-size:9px;color:#aaa}.dashboard-grid{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:23px}.section-heading{display:flex;align-items:center;justify-content:space-between;margin:0 0 15px}.section-heading h2{font-size:15px;font-weight:600;margin:0}.section-heading span,.section-heading a{font-size:10px;color:#999}.section-heading h2 small{font-weight:400;color:#aaa;font-size:10px;margin-left:10px}.task-list{border:1px solid var(--line);border-radius:9px;background:white;padding:0 19px}.task{display:flex;gap:13px;align-items:center;padding:18px 0;border-bottom:1px solid #f0f0ed}.task:last-child{border:0}.task-icon{width:37px;height:37px;border:1px solid #ecece7;border-radius:8px;background:#f7f7f4;display:grid;place-items:center;font:20px Georgia}.task-body{flex:1}.task-title{font-size:12px;margin-bottom:6px}.task-meta{font-size:9px;color:#aaa}.pill{font-size:8px;border:1px solid #e1e1db;background:#f7f7f4;padding:3px 6px;border-radius:4px;margin-left:8px;color:#999}.task .btn{font-size:10px;padding:7px 12px}.mentor-card{padding:22px;border:1px solid var(--line);border-radius:9px;background:#f0f0ed}.mentor-top{display:flex;justify-content:space-between;align-items:center}.sparkle{font-size:27px}.label{border:1px solid #d5d5ce;border-radius:4px;font-size:8px;letter-spacing:1px;padding:3px 5px;color:#888}.mentor-card h3{font-size:17px;font-weight:500;line-height:1.6;margin:19px 0 12px}.mentor-card p{font-size:10px;line-height:1.9;color:#999}.mentor-card .btn{width:100%;margin-top:16px;background:#fbfbf8}.week-card{background:white;border:1px solid var(--line);border-radius:9px;margin-top:17px;padding:19px}.week-title{font-size:11px;display:flex;justify-content:space-between}.week-title span{font-size:9px;color:#aaa}.week{display:flex;justify-content:space-between;margin-top:20px}.day{font-size:8px;text-align:center;color:#aaa}.day i{display:grid;place-items:center;border:1px solid #e1e1db;border-radius:50%;width:23px;height:23px;font-size:9px;font-style:normal;margin-top:8px}.day i.done{color:white;background:#777;border-color:#777}.modules{margin-top:27px}.module-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:13px}.module-card{padding:20px 17px;background:white;border:1px solid var(--line);border-radius:8px;display:block;transition:transform .2s}.module-card:hover{transform:translateY(-3px);border-color:#bbb}.module-icon{font:25px Georgia;margin-bottom:20px;color:#777}.module-card h3{font-size:12px;margin:0 0 7px}.module-card p{font-size:9px;color:#aaa;margin:0 0 20px}.progress-track{height:3px;background:#eee;border-radius:4px;overflow:hidden}.progress-track div{height:100%;background:#888}.module-bottom{margin-top:9px;font-size:8px;color:#999;display:flex;justify-content:space-between}footer{max-width:1440px;margin:auto;border-top:1px solid var(--line);padding:21px 42px;display:flex;justify-content:space-between;font-size:9px;color:#999}footer a{margin-left:12px}.tabs{display:flex;gap:8px;margin:22px 0}.tab{border:1px solid var(--line);border-radius:6px;background:white;padding:9px 17px;font-size:12px}.tab.active{background:#282828;color:white;border-color:#282828}.panel{border:1px solid var(--line);background:white;border-radius:10px;padding:26px;margin-bottom:18px}.split{display:grid;grid-template-columns:1.5fr 1fr;gap:20px}.panel h2{font-size:19px;font-weight:500;margin:0 0 17px}.panel h3{font-size:14px;margin:15px 0 10px}.panel p{line-height:1.9;color:#777;font-size:12px}.big-word{font:48px Georgia;margin:27px 0 10px}.phonetic{color:#aaa;font-size:12px}.word-card{min-height:330px;text-align:center;display:flex;flex-direction:column;align-items:center;justify-content:center}.definition{line-height:1.9;margin:20px 0}.word-actions{display:flex;gap:10px;margin-top:20px}.search{width:100%;background:#fbfbf9;padding:12px;border:1px solid var(--line);border-radius:6px;margin-bottom:18px}.vocab-table{width:100%;border-collapse:collapse;text-align:left}.vocab-table td,.vocab-table th{padding:15px 10px;border-bottom:1px solid var(--line);font-size:12px}.vocab-table th{font-weight:500;color:#999;font-size:10px}.vocab-table td:first-child{font:20px Georgia}.root-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.root-card{padding:23px;border:1px solid var(--line);border-radius:9px;background:white}.root-card h3{font:29px Georgia;margin:10px 0}.root-card p{color:#888;font-size:12px;line-height:1.8}.root-card small{color:#999;font-size:10px}.lesson-list{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.lesson{display:flex;flex-direction:column;min-height:210px}.lesson .btn{margin-top:auto;align-self:flex-start}.lesson p{margin-bottom:23px}.english{font-family:Georgia;line-height:2;font-size:18px;color:#444}.question{font-size:15px;line-height:1.8;margin:23px 0}.option{display:block;width:100%;text-align:left;background:white;border:1px solid var(--line);padding:14px 17px;margin-bottom:10px;border-radius:6px}.option:hover{background:#f1f1ed}.option.selected{border-color:#666;background:#e9e9e3}.feedback{padding:17px;background:#f0f0eb;line-height:1.9;font-size:12px;margin:15px 0;border-radius:6px}.level-picker{display:flex;gap:8px;flex-wrap:wrap;margin:20px 0}.level-picker button{width:43px;height:39px;background:white;border:1px solid var(--line);border-radius:6px}.level-picker button.active{background:#272727;color:white}.form-row{display:flex;gap:15px;margin:18px 0}.field{flex:1;display:flex;flex-direction:column;gap:9px;font-size:11px;color:#777}.field input,.field select{border:1px solid var(--line);background:#fafaf7;border-radius:6px;padding:12px;width:100%;color:#333}.writing-area{width:100%;min-height:300px;border:1px solid var(--line);border-radius:7px;background:#fcfcf9;padding:20px;resize:vertical;font:16px/1.9 Georgia}.prompt-select{width:100%;padding:12px;border:1px solid var(--line);background:white;border-radius:6px;margin-bottom:20px}.note{font-size:10px;color:#999;line-height:1.9}.empty{padding:30px;text-align:center;color:#999;font-size:12px}.overlay{position:fixed;inset:0;background:#17171766;z-index:99;display:flex;justify-content:center;align-items:center;backdrop-filter:blur(3px);padding:20px}.overlay[hidden]{display:none}.dialog{background:#fcfcf9;max-width:650px;width:100%;border-radius:13px;padding:34px;max-height:90vh;overflow:auto;position:relative}.dialog h2{font-size:23px;font-weight:500;margin:0 0 13px}.close{position:absolute;right:15px;top:12px;border:0;background:none;font-size:26px;color:#999}.dialog p{font-size:12px;line-height:1.9;color:#888}.chat-message{background:#ecece6;padding:17px;border-radius:8px;margin:18px 0;font-size:13px;line-height:1.95;white-space:pre-wrap}.chat-input{display:flex;gap:9px;margin-top:15px}.chat-input input{width:100%;padding:12px;border:1px solid var(--line);border-radius:6px}#toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);padding:12px 22px;border-radius:8px;background:#252525;color:white;font-size:12px;z-index:200;opacity:0;pointer-events:none;transition:opacity .2s}#toast.show{opacity:1}.weekly-plan{display:grid;grid-template-columns:repeat(7,1fr);gap:10px;margin-top:20px}.plan-day{background:#f5f5f0;border:1px solid var(--line);padding:14px 10px;border-radius:6px}.plan-day b{font-size:11px}.plan-day p{font-size:10px;line-height:1.8}.check-task{display:flex;gap:12px;align-items:center;padding:14px 0;border-bottom:1px solid var(--line);font-size:12px}.check-task input{accent-color:#555}.inline-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}@media(min-width:1500px){main{padding-top:45px}.hero{min-height:245px}.hero h2{font-size:32px}.task{padding:22px 0}}@media(max-width:1150px){#sidebar{width:205px;padding:30px 15px}.shell{margin-left:205px}main{padding:28px 27px}header{padding:0 27px}.dashboard-grid{grid-template-columns:1fr 235px;gap:16px}.hero-art{right:-45px;opacity:.5}.module-grid{gap:8px}.module-card{padding:17px 12px}.weekly-plan{grid-template-columns:repeat(4,1fr)}}@media(max-width:850px){.dashboard-grid,.split{grid-template-columns:1fr}.dashboard-right{display:grid;grid-template-columns:1fr 1fr;gap:15px}.week-card{margin-top:0}.stats{gap:8px}.stat{padding:15px 12px}.lesson-list,.root-grid{grid-template-columns:repeat(2,1fr)}.local-tag{display:none}.hero h2{font-size:24px}.hero-copy{max-width:85%}.hero-art{opacity:.3}}@media(max-width:640px){#sidebar{transform:translateX(-100%);width:230px;transition:transform .2s}.menu-open #sidebar{transform:translateX(0)}.shell{margin-left:0}header{height:62px;padding:0 18px;gap:12px}.mobile-menu{display:block;background:none;border:0;font-size:19px}.breadcrumb{margin-right:auto}.header-right{gap:8px}main{padding:26px 18px}.page-title-row h1{font-size:23px}.date-pill{display:none}.hero{padding:24px}.hero h2{font-size:24px}.hero-copy{max-width:100%}.hero-art{right:-110px}.stats{grid-template-columns:repeat(2,1fr)}.module-grid{grid-template-columns:repeat(2,1fr)}.dashboard-right{display:block}.week-card{margin-top:15px}.lesson-list,.root-grid{grid-template-columns:1fr}.panel{padding:20px}.form-row{flex-direction:column}.weekly-plan{grid-template-columns:repeat(2,1fr)}footer{padding:18px;flex-direction:column;gap:10px}.tabs{flex-wrap:wrap}.vocab-table td,.vocab-table th{padding:12px 4px}.vocab-table td:first-child{font-size:17px}.dialog{padding:28px 20px}.task-meta{font-size:8px}.task{gap:9px}.task-icon{width:30px}.task .btn{padding:7px}.subtitle{line-height:1.8}}
/* Expanded banks keep the original quiet monochrome visual language. */
.level-workspace{display:block;padding:13px 12px;margin-top:27px;margin-bottom:28px}.level-workspace label{display:block}.level-label{font-size:8px;letter-spacing:1.3px;color:#92928b;display:block;margin-bottom:9px}.level-workspace select{display:block;width:100%;border:0;background:transparent;font-size:14px;font-weight:600;padding:0;color:#292929;cursor:pointer}.level-workspace small{font-size:9px;line-height:1.5;margin-top:8px}.bank-toolbar{display:flex;align-items:center;gap:10px;margin:22px 0}.bank-toolbar .search{margin:0;flex:1;min-width:130px;background:white}.bank-toolbar select{border:1px solid var(--line);background:white;padding:11px 12px;border-radius:6px;font-size:11px;max-width:200px}.bank-toolbar .btn{white-space:nowrap;padding:12px 15px}.table-scroll{overflow-x:auto}.pagination{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:24px;font-size:10px;color:#999}.pagination>div{display:flex;gap:8px}.pagination .btn{padding:8px 13px}.btn:disabled,.text-link:disabled,.level-picker button:disabled{cursor:default;opacity:.35;filter:none}.word-link{font:20px Georgia;border:0;background:none;padding:0;text-align:left}.word-link:hover{text-decoration:underline}.question-list{display:flex;flex-direction:column}.question-row{width:100%;background:transparent;border:0;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:17px;padding:18px 0;text-align:left}.question-row:hover{background:#f9f9f6}.question-row:last-child{border-bottom:0}.question-row b{font-size:12px;font-weight:500}.question-row small{display:block;color:#999;font-size:10px;line-height:1.8;margin-top:5px}.question-row>span:nth-child(2){min-width:0;flex:1}.question-number{font:9px monospace;color:#999;min-width:92px}.question-state{font-size:10px;white-space:nowrap;color:#888;margin-left:auto}.option:disabled{cursor:default;color:#555}.option.selected{border-color:#555;background:#eaeae5}.keyboard-hint{margin-top:20px;font-size:10px;color:#999;display:flex;gap:8px;align-items:center}.keyboard-hint kbd,.btn kbd{font:9px monospace;border:1px solid #d8d8d2;border-radius:4px;padding:3px 5px;background:#f5f5ef;color:#666}.card-face{min-height:90px;display:grid;place-items:center}.word-example{font:17px/1.8 Georgia!important;color:#555!important}.word-example small{font:11px/1.9 'Noto Sans SC',sans-serif;color:#999}.sound-button{border:0;background:transparent;color:#777;font-size:11px;cursor:pointer;margin-left:8px}.word-card .definition{margin:15px 0 21px}.word-card .definition b{font-size:19px;font-weight:500}.word-card .definition>p:not(.word-example){font-size:11px;max-width:420px;line-height:1.9;color:#999}.lesson .note{display:block;margin-bottom:14px}.lesson h2{overflow-wrap:anywhere}.form-row .field select{min-width:0}.field>select{border:1px solid var(--line);background:#fafaf7;border-radius:6px;padding:11px;width:100%;font-size:11px;color:#444}.reading-passage .english{font-size:18px;line-height:2}.level-picker button:first-child{width:50px}.date-pill{cursor:pointer}.pagination .btn:disabled:hover{filter:none}input:focus-visible,textarea:focus-visible,select:focus-visible{outline:2px solid #777;outline-offset:2px}.big-word{font-size:clamp(27px,4vw,48px);overflow-wrap:anywhere}.word-card{padding:25px 20px}.word-actions .btn{min-width:95px}.level-picker button.active:disabled{background:#ddd;color:#666}.check-task label{display:flex;align-items:center;gap:9px}
@media(max-width:1100px){.question-number{display:none}.bank-toolbar{flex-wrap:wrap}.bank-toolbar .search{flex-basis:100%}.bank-toolbar select{flex:1;max-width:none}.section-heading span{max-width:62%;text-align:right;line-height:1.8}.word-card .big-word{font-size:35px}}@media(max-width:640px){.bank-toolbar .btn{flex:1}.bank-toolbar select{min-width:130px}.pagination{flex-wrap:wrap}.question-row{gap:9px}.question-row small{font-size:10px}.question-state{font-size:9px}.vocab-table{min-width:590px}.level-workspace{margin-top:24px}.modules>.section-heading{align-items:flex-start}.modules>.section-heading span{max-width:53%}.keyboard-hint{font-size:9px;gap:5px}.word-card .big-word{font-size:36px}.page-title-row{align-items:flex-start}.date-pill{display:none}}
.arena-intro{border:1px solid #e1e1da;background:#eaeae5;border-radius:11px;padding:30px 34px;display:flex;justify-content:space-between;align-items:center}.arena-intro h2{font-size:28px;line-height:1.6;font-weight:500;margin:15px 0}.arena-intro p{font-size:11px;color:#888;max-width:550px;line-height:1.9}.arena-clock-art{width:140px;height:140px;border:1px solid #bcbcb3;border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;font:53px Georgia;color:#7c7c72}.arena-clock-art span{font:9px 'DM Sans';letter-spacing:3px;margin-top:9px}.arena-session-bar{display:flex;align-items:center;justify-content:space-between;border:1px solid var(--line);border-radius:9px;padding:19px 25px;background:white;margin-bottom:17px}.arena-session-bar p{font-size:11px;color:#999;margin-bottom:0}.arena-session-bar strong{font:34px 'DM Sans';font-variant-numeric:tabular-nums}.arena-workspace{display:grid;grid-template-columns:285px 1fr;gap:20px}.outline-input{min-height:100px;resize:vertical;border:1px solid var(--line);border-radius:6px;padding:12px;font:12px/1.9 'Noto Sans SC';color:#555;background:#fcfcf8}.arena-essay{min-height:490px;font-size:18px}.writing-area[readonly],.outline-input[readonly]{background:#f6f6f1;color:#777}.arena-entry{border:1px solid #dcdcd3;background:#edede7;border-radius:8px;padding:20px 23px;margin-bottom:24px;display:flex;align-items:center;justify-content:space-between;gap:15px}.arena-entry span{font-size:12px}.arena-entry b{font-size:11px;color:#888;font-weight:400}#arena-error{font-size:12px;color:#666}#arena-body h3{font-size:14px}#arena-body .panel>p{line-height:1.9}.arena-prompt h2{margin-top:17px}.arena-workspace .panel{height:fit-content}@media(max-width:950px){.arena-workspace{grid-template-columns:1fr}.arena-workspace>aside{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.arena-workspace>aside .eyebrow,.arena-workspace>aside h2,.arena-workspace>aside p,.arena-workspace>aside button{grid-column:1/-1}.arena-entry{flex-wrap:wrap}.arena-entry b{order:3;width:100%}}@media(max-width:640px){.arena-intro{padding:23px}.arena-intro h2{font-size:23px}.arena-clock-art{width:85px;height:85px;font-size:35px;flex-shrink:0;margin-left:10px}.arena-clock-art span{font-size:7px;letter-spacing:1px}.arena-workspace>aside{display:block}.arena-session-bar{padding:17px}.arena-session-bar strong{font-size:26px}.arena-essay{min-height:400px}.arena-entry{padding:18px}.arena-session-bar .label{font-size:8px}}
@media(max-height:760px){#sidebar{overflow-y:auto}.side-quote{display:none}}

.unit-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.unit-card{margin:0}.unit-card h3{font-family:Georgia,serif;font-size:20px;margin:18px 0 8px}.unit-card .inline-actions{margin-top:20px}.unit-summary{display:flex;align-items:center;justify-content:space-between;gap:20px}.unit-summary h2{margin-top:15px}@media(max-width:1100px){.unit-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:640px){.unit-grid{grid-template-columns:1fr}.unit-summary{display:block}.bank-toolbar{flex-wrap:wrap}}

.account-form-panel .field{margin:20px 0}.account-form-panel input:not([type=checkbox]){width:100%;box-sizing:border-box;padding:13px 14px;border:1px solid #dededb;border-radius:7px;background:#fff;font:inherit;margin-top:8px}.account-submit{width:100%;margin:8px 0 18px;justify-content:center}.account-error{color:#a32424;min-height:22px}.account-aside{padding:40px 20px}.account-aside h2{font-size:38px;line-height:1.5;margin:26px 0}.account-benefit{display:flex;gap:22px;align-items:center;padding:20px 0;border-bottom:1px solid #ddd}.account-benefit b{font:italic 24px Georgia;color:#888}.account-detail{padding:20px 0;border-top:1px solid #ddd;border-bottom:1px solid #ddd;margin-top:24px;display:grid;gap:10px}.account-layout{align-items:start}.header-right .btn{max-width:160px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}@media(max-width:640px){.header-right .local-tag{display:none}.account-aside{padding:20px 0}.account-aside h2{font-size:28px}}
.audio-player[hidden]{display:none}.audio-player{position:fixed;bottom:18px;left:calc(50% + 100px);transform:translateX(-50%);display:flex;align-items:center;gap:18px;max-width:850px;width:calc(100% - 310px);padding:14px 18px;background:#fff;border:1px solid #d6d6d2;box-shadow:0 8px 40px #0002;border-radius:12px;z-index:80}.audio-player>div{flex:1;min-width:100px}.audio-player b{display:block;font:18px Georgia}.audio-player small{display:block;font-size:11px;color:#777;margin-top:5px}.audio-player audio{width:290px;height:42px}.audio-visible main{padding-bottom:150px}.course-summary{display:flex;align-items:center;justify-content:space-between;gap:20px}.course-summary h2{margin-top:15px}.course-filter{display:flex;align-items:center;gap:12px;margin:24px 0}.course-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.course-card{margin:0;display:flex;flex-direction:column}.course-card h3{margin-top:18px}.course-card>p{flex:1}.course-card .module-bottom{margin-top:18px}.course-chapter{margin:30px 0}.course-stepper{display:grid;grid-template-columns:repeat(4,1fr);margin:25px 0;border:1px solid #ddd;border-radius:10px;overflow:hidden}.course-stepper button{border:0;border-right:1px solid #ddd;padding:18px;background:#fff;text-align:left;color:#777;cursor:pointer}.course-stepper button:last-child{border-right:0}.course-stepper button.active{background:#242424;color:#fff}.course-stepper b{font:24px Georgia;margin-right:15px}.course-workspace{display:grid;grid-template-columns:minmax(0,1.8fr) minmax(260px,1fr);gap:24px;align-items:start}.course-reading h2{margin-top:18px}.course-lead{font-size:17px;line-height:1.9}.teaching-paragraph{display:flex;gap:17px;align-items:start;margin:23px 0}.teaching-paragraph p{margin:0;line-height:2;font-size:16px;color:#444}.lesson-number{display:flex;flex-shrink:0;align-items:center;justify-content:center;width:28px;height:28px;background:#ecece8;border-radius:50%;font-size:12px;margin-top:5px}.course-big-idea,.course-caution,.worked-question{padding:24px;background:#f5f5f2;border-radius:8px;margin:24px 0}.course-big-idea span{font-size:12px;color:#777}.course-big-idea p{font-size:18px;line-height:1.8}.course-terms dt{font-family:Georgia;font-size:18px;margin-top:18px}.course-terms dd{margin:5px 0;color:#777;font-size:13px}.prerequisite-link{display:flex;justify-content:space-between;width:100%;text-align:left;border:0;border-bottom:1px solid #eee;background:transparent;padding:14px 0;cursor:pointer;gap:10px}.prerequisite-link small{color:#777;white-space:nowrap}.method-step{display:flex;gap:20px;margin:26px 0}.method-step>span{font:italic 28px Georgia;color:#888}.method-step h3{margin:0}.method-step p{font-size:16px;line-height:1.9}.course-footer{display:flex;justify-content:space-between;margin-top:35px;padding-top:25px;border-top:1px solid #eee;gap:12px}.solution-step{border-left:2px solid #444;padding:5px 0 5px 18px;margin:24px 0}.solution-step p{font-size:16px;line-height:1.8}.course-visual{background:#f5f5f2;padding:24px;margin:30px 0;border-radius:8px}.course-visual svg{max-width:400px;width:100%;display:block;margin:auto}.course-visual figcaption{font-size:13px;color:#666;line-height:1.8}.course-visual input[type=range]{display:block;width:100%;margin:24px 0;accent-color:#333}.fraction-demo{display:grid;grid-template-columns:repeat(8,1fr);gap:4px}.fraction-demo i{height:50px;border:1px solid #aaa;background:white}.fraction-demo .filled{background:#444}.percent-track{height:28px;background:#ddd;border-radius:4px;overflow:hidden}.percent-track>div{height:100%;background:#444}.demo-equation{font:30px Georgia}.similar-demo{display:grid;gap:3px}.similar-demo i{height:28px;background:#444}.course-practice-banner{display:flex;align-items:center;justify-content:space-between;gap:18px}#course-check-options .option{display:flex;align-items:center;gap:12px;padding:16px;cursor:pointer}#course-check-options input{accent-color:#333}
@media(max-width:1050px){.course-workspace{grid-template-columns:1fr}.course-stepper b{margin-right:8px;font-size:20px}.course-stepper button{padding:16px 10px}.audio-player{left:50%;width:calc(100% - 40px);box-sizing:border-box}.audio-player audio{width:240px}}
@media(max-width:640px){.course-grid{grid-template-columns:1fr}.course-summary{display:block}.course-filter{flex-wrap:wrap}.course-stepper button{padding:13px 8px;text-align:center}.course-stepper b{display:block;margin:0 0 8px}.course-stepper span{font-size:11px}.course-visual{padding:15px}.course-practice-banner{align-items:flex-start;flex-direction:column}.audio-player{flex-wrap:wrap;gap:8px;padding:10px 12px;bottom:8px;width:calc(100% - 16px)}.audio-player>div{width:calc(100% - 50px);flex:auto}.audio-player audio{width:calc(100% - 45px);order:3}.audio-player>.btn{order:4}.course-reading{padding:20px}.course-footer .btn{font-size:12px}}

/* Comfortable mobile navigation and touch controls. */
.mobile-close,.nav-backdrop{display:none}
@media(max-width:640px){
  #sidebar{height:100dvh;overflow-y:auto;z-index:101}
  .menu-open{overflow:hidden}
  .menu-open .nav-backdrop{display:block;position:fixed;inset:0;width:100%;height:100%;border:0;background:#17171766;z-index:100}
  .mobile-close{display:grid;place-items:center;position:absolute;top:22px;right:16px;width:44px;height:44px;border:0;background:transparent;font-size:28px;color:#555}
  .mobile-menu{min-width:44px;min-height:44px;font-size:22px}
  .tab,.btn,.text-link,.sound-button,.icon-button{min-height:44px}
  .tabs{flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none;padding-bottom:5px;margin-right:-18px;padding-right:18px;-webkit-overflow-scrolling:touch}
  .tabs::-webkit-scrollbar{display:none}
  .tab{white-space:nowrap;flex:0 0 auto}
  .inline-actions .text-link{padding:9px 6px}
  .pagination .btn{min-height:44px}
  .word-actions{width:100%}.word-actions .btn{flex:1}
  .word-card .inline-actions{width:100%;justify-content:center}
}