:root{
  --ink:#292642;--muted:#746f8d;--line:#e9e6f4;--paper:#fff;--bg:#f6f5fb;
  --purple:#6f5ce7;--purple-dark:#5541c7;--purple-soft:#efedff;--orange:#ff9f43;
  --green:#36b37e;--red:#e35d6a;--shadow:0 18px 50px rgba(72,61,130,.10);
  font-family:"PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;color:var(--ink)
}
*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at 10% 0,#fff8df 0,transparent 25%),radial-gradient(circle at 90% 15%,#eeeaff 0,transparent 28%),var(--bg);min-height:100vh}button,input,select,textarea{font:inherit}button{cursor:pointer}.app-shell{min-height:100vh}.app-shell.is-loading{visibility:hidden}
.topbar{height:76px;display:flex;align-items:center;gap:28px;padding:0 36px;background:rgba(255,255,255,.88);backdrop-filter:blur(16px);border-bottom:1px solid rgba(230,226,242,.9);position:sticky;top:0;z-index:30}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);min-width:280px}.brand-mark{width:44px;height:44px;border-radius:15px;display:grid;place-items:center;background:linear-gradient(145deg,#ffe385,#ffb768);box-shadow:0 8px 18px rgba(255,159,67,.24);font-size:22px}.brand b{display:block;font-size:18px}.brand small{display:block;color:var(--muted);font-size:11px;margin-top:2px}.main-nav{display:flex;gap:6px;background:#f3f1f9;padding:5px;border-radius:14px}.nav-btn{border:0;background:transparent;color:var(--muted);padding:9px 18px;border-radius:10px;font-weight:700}.nav-btn.active{background:#fff;color:var(--purple);box-shadow:0 4px 12px rgba(70,58,120,.08)}.top-actions{margin-left:auto;display:flex;align-items:center;gap:12px;position:relative}.course-picker{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:12px}.course-picker select{border:1px solid var(--line);background:#fff;border-radius:12px;padding:9px 30px 9px 12px;color:var(--ink);max-width:220px}.user-pill{border:1px solid var(--line);background:#fff;border-radius:999px;padding:7px 12px 7px 8px;display:flex;align-items:center;gap:7px;font-weight:700;color:var(--ink)}.user-pill span:first-child{width:30px;height:30px;border-radius:50%;background:#fff2cd;display:grid;place-items:center}.user-menu{position:absolute;right:0;top:52px;width:190px;padding:8px;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow)}.user-menu button,.user-menu a{display:block;width:100%;padding:11px 12px;border:0;background:none;text-align:left;color:var(--ink);text-decoration:none;border-radius:9px}.user-menu button:hover,.user-menu a:hover{background:var(--purple-soft)}
main{max-width:1480px;margin:0 auto;padding:28px 34px 60px}.view{display:none}.view.active{display:block}.welcome-strip{display:flex;align-items:center;justify-content:space-between;gap:24px;background:linear-gradient(115deg,#6552dc,#8a75f0);color:#fff;border-radius:24px;padding:24px 28px;margin-bottom:22px;box-shadow:0 18px 40px rgba(82,65,190,.22)}.eyebrow{display:block;font-size:12px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--purple)}.welcome-strip .eyebrow{color:#dcd7ff}.welcome-strip h1{margin:5px 0 6px;font-size:24px}.welcome-strip p{margin:0;color:#e7e3ff}.summary-stats{display:flex;gap:10px}.summary-stats div{min-width:92px;padding:13px 15px;border-radius:16px;background:rgba(255,255,255,.13);text-align:center}.summary-stats b{display:block;font-size:24px}.summary-stats span{font-size:11px;color:#e7e3ff}
.learning-layout{display:grid;grid-template-columns:300px minmax(0,1fr);gap:22px}.lesson-sidebar,.task-card,.step-card{background:var(--paper);border:1px solid var(--line);border-radius:22px;box-shadow:0 10px 28px rgba(74,65,120,.06)}.lesson-sidebar{padding:20px;align-self:start;position:sticky;top:98px;max-height:calc(100vh - 120px);overflow:auto}.sidebar-title{display:flex;align-items:flex-start;justify-content:space-between;gap:10px}.sidebar-title h2{font-size:18px;margin:4px 0 16px}.badge,.soft-badge{display:inline-flex;align-items:center;padding:5px 9px;border-radius:999px;background:#f2f0f8;color:var(--muted);font-size:11px;font-weight:700}.lesson-list{display:flex;flex-direction:column;gap:9px}.lesson-item{width:100%;border:1px solid var(--line);background:#fff;border-radius:15px;padding:13px;text-align:left;display:grid;grid-template-columns:35px 1fr auto;align-items:center;gap:10px;color:var(--ink)}.lesson-item:hover{border-color:#cfc8fb}.lesson-item.active{background:var(--purple-soft);border-color:#c8bffc}.lesson-index{width:34px;height:34px;border-radius:11px;background:#f3f1f9;display:grid;place-items:center;font-weight:800;color:var(--purple)}.lesson-item.active .lesson-index{background:var(--purple);color:#fff}.lesson-name b{display:block;font-size:14px}.lesson-name small{display:block;color:var(--muted);font-size:11px;margin-top:3px}.lesson-score{font-size:12px;font-weight:800;color:var(--green)}
.lesson-workspace{min-width:0}.task-card{padding:25px 28px;margin-bottom:16px}.task-topline{display:flex;gap:8px;align-items:center}.method-badge{padding:6px 10px;border-radius:999px;background:#fff1d9;color:#b86b16;font-size:12px;font-weight:800}.task-card h2{font-size:27px;margin:14px 0 8px}.task-card>p{font-size:16px;line-height:1.8;margin:0;color:#4f4a67}.requirement{margin:15px 0 18px;padding:12px 14px;background:#f8f7fc;border-left:4px solid var(--purple);border-radius:10px;color:var(--muted);font-size:14px;line-height:1.65}.primary-btn,.ghost-btn,.hint-btn{border:0;border-radius:12px;padding:11px 18px;font-weight:800;transition:.18s}.primary-btn{background:var(--purple);color:#fff;box-shadow:0 8px 18px rgba(111,92,231,.22)}.primary-btn:hover{background:var(--purple-dark);transform:translateY(-1px)}.primary-btn.large{padding:13px 20px}.ghost-btn{background:#f2f0f8;color:var(--ink)}.ghost-btn:hover{background:#e9e6f4}.hint-btn{background:#fff3d7;color:#9b651b}.full{width:100%}
.stepper-wrap{overflow-x:auto;padding:2px 0 14px}.stepper{display:grid;grid-template-columns:repeat(6,minmax(116px,1fr));gap:7px;min-width:780px}.step-node{border:1px solid var(--line);background:#fff;border-radius:13px;padding:10px 9px;text-align:left;color:var(--muted);position:relative}.step-node b{display:block;font-size:11px;margin-bottom:4px}.step-node span{font-size:12px;font-weight:700}.step-node.active{background:var(--purple);border-color:var(--purple);color:#fff}.step-node.done{background:#ebfaf3;border-color:#c4ebd8;color:#17704d}.step-node.done:after{content:"✓";position:absolute;right:8px;top:8px;font-weight:900}.step-card{padding:26px 28px}.step-header{display:flex;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line);padding-bottom:18px}.step-number{font-size:12px;color:var(--purple);font-weight:900}.step-header h2{font-size:23px;margin:5px 0 6px}.step-header p{color:var(--muted);line-height:1.7;margin:0}.save-state{font-size:11px;color:var(--green);white-space:nowrap}.step-content{min-height:310px;padding:24px 0}.step-actions{border-top:1px solid var(--line);padding-top:18px;display:flex;align-items:center;justify-content:space-between;gap:12px}.step-action-right{display:flex;gap:10px}
.method-lesson{display:grid;grid-template-columns:1.15fr .85fr;gap:18px}.learning-box,.challenge-box,.reference-card,.practice-box,.material-card,.outline-box,.editor-box,.check-panel{border:1px solid var(--line);border-radius:18px;padding:20px;background:#fff}.learning-box{background:linear-gradient(145deg,#f7f5ff,#fff)}.learning-box h3,.challenge-box h3,.practice-box h3,.outline-box h3,.editor-box h3{margin:0 0 10px}.learning-box p,.challenge-box p{line-height:1.8;color:#504a68}.goal-line{display:flex;gap:10px;align-items:flex-start;background:#fff;padding:12px;border-radius:12px;margin-top:14px}.goal-line b{color:var(--purple);white-space:nowrap}.challenge-box{background:#fff9e8}.challenge-box textarea,.practice-box textarea,.outline-box textarea,.editor-box textarea,.material-card input{width:100%;border:1px solid var(--line);border-radius:12px;padding:12px 14px;outline:none;background:#fff;color:var(--ink)}textarea:focus,input:focus{border-color:#9c8df1;box-shadow:0 0 0 3px rgba(111,92,231,.09)}.challenge-box textarea{min-height:95px;resize:vertical;margin-top:10px}.empty-reference{border:2px dashed #dcd7ee;border-radius:18px;padding:38px;text-align:center;color:var(--muted)}.reference-list{display:grid;gap:16px}.reference-card{padding:0;overflow:hidden}.reference-head{display:flex;justify-content:space-between;gap:15px;padding:17px 19px;background:#faf9fd;border-bottom:1px solid var(--line)}.reference-head h3{margin:0;font-size:17px}.reference-head p{margin:4px 0 0;color:var(--muted);font-size:12px}.verify-tag{font-size:11px;padding:5px 8px;border-radius:999px;background:#fff3d7;color:#8d611f;height:max-content}.verify-tag.verified{background:#e7f8ef;color:#1a7752}.reference-body{display:grid;grid-template-columns:1fr 1fr}.reference-column{padding:18px 20px}.reference-column+ .reference-column{border-left:1px solid var(--line);background:#fcfbff}.reference-column h4{margin:0 0 9px;font-size:13px;color:var(--purple)}.reference-column p{margin:0;line-height:1.9;color:#48435d;white-space:pre-wrap}.reference-analysis{padding:14px 20px;background:#fffaf0;border-top:1px solid #f0e4c8;color:#665a42;line-height:1.7;font-size:13px}.source-link{color:var(--purple);text-decoration:none}.rights-note{display:block;color:#9a7562;font-size:11px;margin-top:8px}
.pattern-row,.word-bank{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}.pattern-chip,.word-chip{border:1px solid #d9d3fa;background:#f7f5ff;color:#5848c5;border-radius:999px;padding:7px 11px;font-size:12px}.pattern-chip:hover,.word-chip:hover{background:var(--purple);color:#fff}.practice-box textarea{min-height:150px;resize:vertical;line-height:1.8}.mini-counter{display:flex;justify-content:space-between;color:var(--muted);font-size:11px;margin-top:8px}.materials-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}.material-card{background:#fbfaff}.material-card label{display:block;font-weight:800;font-size:13px;margin-bottom:8px}.material-card small{color:var(--muted);display:block;margin-top:7px}.outline-preview{display:grid;gap:10px;margin-top:14px}.outline-line{display:grid;grid-template-columns:70px 1fr;gap:10px;padding:12px;border-radius:12px;background:#f8f7fc}.outline-line b{color:var(--purple)}.outline-box textarea{min-height:220px;resize:vertical;line-height:1.8}.writing-grid{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:16px}.editor-box textarea{min-height:420px;resize:vertical;line-height:2;font-size:16px}.editor-toolbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:11px}.editor-toolbar span{font-size:12px;color:var(--muted)}.check-panel h3{margin:0 0 12px}.check-list{display:grid;gap:9px}.check-item{display:flex;gap:8px;align-items:flex-start;padding:9px;background:#faf9fd;border-radius:10px;color:#5c5670;font-size:13px}.check-item input{accent-color:var(--purple);margin-top:2px}.submit-work{margin-top:14px}.section-note{color:var(--muted);line-height:1.7;font-size:13px}
.page-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:20px;margin-bottom:22px}.page-heading h1{font-size:30px;margin:4px 0}.page-heading p{margin:0;color:var(--muted)}.search-box{display:flex;background:#fff;border:1px solid var(--line);border-radius:13px;overflow:hidden}.search-box input{border:0;padding:11px 13px;outline:0;width:260px}.search-box button{border:0;background:var(--purple);color:#fff;padding:0 17px}.works-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.work-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px;box-shadow:0 8px 24px rgba(74,65,120,.05)}.work-card-head{display:flex;justify-content:space-between;gap:12px}.work-card h3{font-size:16px;margin:0}.work-card small{display:block;color:var(--muted);margin-top:4px}.work-score{font-size:25px;font-weight:900;color:var(--purple)}.work-card p{color:#504a68;line-height:1.75;display:-webkit-box;-webkit-line-clamp:5;-webkit-box-orient:vertical;overflow:hidden}.work-feedback{font-size:12px;background:#f8f7fc;padding:10px;border-radius:10px;white-space:pre-line;color:var(--muted)}.empty-state{grid-column:1/-1;padding:70px 20px;text-align:center;color:var(--muted);background:#fff;border:2px dashed var(--line);border-radius:20px}
.modal-overlay{position:fixed;inset:0;background:rgba(29,25,52,.44);backdrop-filter:blur(8px);z-index:100;display:none;align-items:center;justify-content:center;padding:20px}.modal-overlay.show{display:flex}.auth-modal,.small-modal,.feedback-modal{position:relative;width:min(520px,100%);max-height:94vh;overflow:auto;background:#fff;border-radius:26px;padding:30px;box-shadow:0 30px 90px rgba(30,23,70,.28)}.auth-modal{text-align:center;width:min(480px,100%)}.auth-illustration{font-size:42px}.auth-modal h1{font-size:24px;margin:7px 0}.auth-modal>p{color:var(--muted);line-height:1.65;font-size:13px}.auth-tabs{display:flex;background:#f2f0f8;padding:4px;border-radius:12px;margin:16px 0}.auth-tabs button{flex:1;border:0;background:transparent;padding:9px;border-radius:9px;color:var(--muted);font-weight:800}.auth-tabs button.active{background:#fff;color:var(--purple);box-shadow:0 4px 10px rgba(60,50,100,.08)}.field-label{text-align:left;display:block;font-size:12px;font-weight:800}.field-label input{display:block;width:100%;margin-top:7px;padding:13px;border:1px solid var(--line);border-radius:12px;text-align:center;font-size:17px}.pin-label{display:flex;justify-content:space-between;margin:15px 0 9px;font-size:12px;font-weight:800}.pin-label small{color:var(--muted);font-weight:400}.pin-dots{display:flex;justify-content:center;gap:14px;margin-bottom:12px}.pin-dots i{width:15px;height:15px;border-radius:50%;background:#e4e0ef}.pin-dots i.filled{background:var(--purple);box-shadow:0 0 0 5px var(--purple-soft)}.pin-pad{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-bottom:14px}.pin-pad button{height:46px;border:1px solid var(--line);background:#fff;border-radius:11px;font-weight:900;font-size:17px;color:var(--ink)}.pin-pad button:hover{background:var(--purple-soft);border-color:#c7befa}.pin-pad .pin-fn{font-size:12px;color:var(--muted)}.form-error{min-height:18px;color:var(--red)!important;margin-bottom:0!important}.local-profiles{display:grid;gap:8px;margin-top:12px}.local-profile-quick{border:1px solid var(--line);background:#faf9fd;border-radius:12px;padding:10px 12px;display:flex;align-items:center;justify-content:space-between;color:var(--ink)}.local-profile-quick b{display:flex;align-items:center;gap:8px}.modal-close{position:absolute;right:16px;top:14px;width:32px;height:32px;border:0;border-radius:50%;background:#f2f0f8;font-size:20px;color:var(--muted)}.small-modal h2,.feedback-modal h2{margin:5px 0 7px}.small-modal>p{color:var(--muted);line-height:1.6}.profile-list{display:grid;gap:10px;margin:18px 0}.profile-entry{border:1px solid var(--line);background:#fff;border-radius:14px;padding:12px;display:flex;align-items:center;justify-content:space-between}.profile-entry-main{display:flex;align-items:center;gap:11px}.profile-entry-main span{width:42px;height:42px;border-radius:14px;background:#fff2cd;display:grid;place-items:center;font-size:22px}.profile-entry small{display:block;color:var(--muted);margin-top:3px}.profile-entry button{border:0;background:var(--purple-soft);color:var(--purple);border-radius:9px;padding:8px 12px;font-weight:800}.hint-loading{padding:30px;text-align:center;color:var(--muted)}.hint-result{display:grid;gap:10px}.hint-card{padding:13px 14px;background:#fff8e8;border-radius:12px;line-height:1.7;color:#685534}.coach-question{padding:14px;background:var(--purple-soft);border-radius:12px;color:#4e40ae;font-weight:700}.score-orbit{width:100px;height:100px;border-radius:50%;margin:0 auto 14px;background:conic-gradient(var(--purple) 0 80%,#ebe8f5 80%);display:grid;place-items:center;position:relative}.score-orbit:after{content:"";position:absolute;inset:8px;background:#fff;border-radius:50%}.score-orbit b,.score-orbit span{z-index:1;position:absolute}.score-orbit b{font-size:35px;transform:translateY(-7px)}.score-orbit span{font-size:11px;color:var(--muted);transform:translateY(22px)}.feedback-modal{text-align:center}.metric-row{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:18px 0}.metric{background:#f8f7fc;padding:10px 5px;border-radius:11px}.metric b{display:block;color:var(--purple)}.metric span{font-size:11px;color:var(--muted)}.feedback-text{text-align:left;white-space:pre-line;line-height:1.8;background:#faf9fd;padding:16px;border-radius:14px;margin-bottom:16px}.toast-stack{position:fixed;right:22px;bottom:22px;display:grid;gap:8px;z-index:200}.toast{background:#292642;color:#fff;padding:11px 14px;border-radius:11px;box-shadow:var(--shadow);font-size:13px}.toast.error{background:#b84150}.toast.success{background:#207557}
@media(max-width:1100px){.brand{min-width:auto}.brand small{display:none}.learning-layout{grid-template-columns:240px minmax(0,1fr)}.works-grid{grid-template-columns:repeat(2,1fr)}.reference-body,.method-lesson,.writing-grid{grid-template-columns:1fr}.reference-column+.reference-column{border-left:0;border-top:1px solid var(--line)}.check-panel{order:-1}.materials-grid{grid-template-columns:1fr}}
@media(max-width:780px){.topbar{height:auto;padding:12px 16px;flex-wrap:wrap;gap:10px}.brand b{font-size:16px}.main-nav{order:3;width:100%}.main-nav button{flex:1}.course-picker span{display:none}.course-picker select{max-width:140px}.top-actions{gap:7px}.user-pill #userName{display:none}main{padding:18px 14px 50px}.welcome-strip{align-items:flex-start;flex-direction:column;padding:20px}.summary-stats{width:100%}.summary-stats div{flex:1;min-width:0}.learning-layout{display:block}.lesson-sidebar{position:static;max-height:none;margin-bottom:14px}.lesson-list{display:grid;grid-auto-flow:column;grid-auto-columns:230px;overflow:auto;padding-bottom:5px}.task-card,.step-card{padding:20px}.task-card h2{font-size:23px}.step-header{flex-direction:column}.step-actions{align-items:stretch}.step-action-right{flex-direction:column;flex:1}.works-grid{grid-template-columns:1fr}.page-heading{align-items:stretch;flex-direction:column}.search-box input{width:100%}.auth-modal,.small-modal,.feedback-modal{padding:24px}.metric-row{grid-template-columns:repeat(2,1fr)}}
@media(max-width:480px){.brand span:nth-child(2){display:none}.course-picker{max-width:140px}.welcome-strip h1{font-size:20px}.summary-stats b{font-size:19px}.lesson-list{grid-auto-columns:210px}.step-card{padding:17px}.step-content{padding:18px 0}.step-actions{flex-direction:column}.step-actions>button{width:100%}.step-action-right{width:100%}.step-action-right button{width:100%}.materials-grid{grid-template-columns:1fr}.reference-column p{font-size:14px}.pin-pad button{height:43px}}