@import url("learn.css");
:root{font-family:Inter,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:#26383e;background:#f7f7f2;--ink:#243e47;--accent:#ad8354;--line:#e5e7df;--muted:#748086;--paper:#fff;--sidebar:#1c3038}body{background:#f7f7f2;font-size:14px;line-height:1.55}a{color:inherit}button,.button{display:inline-flex;gap:9px;align-items:center;justify-content:center;min-height:43px;border-radius:8px;padding:10px 16px;font-size:14px;font-weight:550;border-color:#dce2dc;transition:background .15s,border-color .15s}button:hover,.button:hover{background:#edf0e9;border-color:#a8b8b4}.primary{background:var(--ink);border-color:var(--ink);color:white}.primary:hover{background:#152e37;color:white}button:disabled{opacity:.45;cursor:not-allowed}input,select,textarea{min-height:44px;border:1px solid #d7ded8;border-radius:8px;color:#26383e;padding:10px 12px;font-size:14px}input::placeholder{color:#929c9c}input[type=checkbox]{min-height:18px;width:18px;height:18px;accent-color:var(--ink)}h1,h2,h3,p{overflow-wrap:anywhere}h1{font-size:clamp(27px,2.5vw,36px);font-weight:650;letter-spacing:-.05em;line-height:1.32}h2{font-size:21px;font-weight:650;letter-spacing:-.025em}h3{font-size:17px;font-weight:600;line-height:1.5}p{line-height:1.8}progress{appearance:none;height:6px;border:0;background:#e9ece5;border-radius:20px;width:100%;overflow:hidden}progress::-webkit-progress-bar{background:#e9ece5;border-radius:20px}progress::-webkit-progress-value{background:#ad8354;border-radius:20px}progress::-moz-progress-bar{background:#ad8354;border-radius:20px}.icon{width:20px;height:20px;flex-shrink:0;vertical-align:middle}.button 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254px;gap:20px}.study-hero{border-radius:12px;min-height:366px;padding:34px 32px 25px;color:#fff7ec;position:relative;overflow:hidden;background:linear-gradient(90deg,rgba(14,23,25,.38),rgba(14,23,25,.15) 65%,transparent),url("assets/learning/piano-study-hero-v1.webp") center/cover}.hero-kicker{font-size:9px;letter-spacing:.2em;color:#e2c9a3}.study-hero h1{font-size:clamp(27px,2.2vw,38px);letter-spacing:-.035em;line-height:1.55;margin:20px 0 14px;font-weight:500;max-width:600px;text-shadow:0 1px 14px #17212755}.study-hero h1 span{color:#dbb983}.study-hero p{font-size:11px;color:#bfc5bf;line-height:1.8;margin-bottom:25px}.study-hero .actions{gap:20px}.hero-primary{background:#f4ecd9;color:#374344;border-color:#f4ecd9;font-size:12px;padding:10px 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small{font-family:inherit;font-size:15px;margin-left:5px}.continue-detail{font-size:9px;color:#83907c;margin:10px 0 18px}.continue-card .full{font-size:11px;min-height:39px;margin-top:auto}.continue-history{display:flex;justify-content:center;align-items:center;font-size:10px;color:#71816e;margin-top:16px;text-decoration:none}.continue-history .icon{width:12px;height:12px}.next-illustration{color:#9ba793;border-bottom:1px solid #d9dfd0;padding-bottom:10px}.next-illustration .icon{width:36px;height:36px}.overview-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border:1px solid var(--line);border-radius:11px;background:#fdfdf9;margin:22px 0 34px;padding:20px 0}.overview-stat{display:flex;align-items:center;gap:14px;padding:0 23px;border-right:1px solid var(--line)}.overview-stat:last-child{border-right:0}.stat-icon{color:#a38e72;background:#f5f0e6;border:1px solid #eee7da;display:grid;place-items:center;width:36px;height:36px;border-radius:9px;flex-shrink:0}.stat-icon 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10px}.topic-card>p{font-size:10px;line-height:1.9;min-height:133px}.topic-footer>span{font-size:8px}.topic-footer>a{font-size:11px}.topic-method{font-size:8px;gap:3px}.terms-banner{grid-template-columns:1fr;padding:27px;gap:21px}.terms-banner>div:first-child{border-right:0;border-bottom:1px solid #d9cfc9;padding-bottom:22px;min-height:0}.term-calligraphy{font-size:42px}.terms-banner strong{font-size:17px}.terms-banner p{font-size:11px}.terms-controls{gap:15px;flex-wrap:wrap}.segmented button{font-size:10px;padding:7px 11px}.subtle-link{font-size:9px}.term-grid{gap:13px}.term-card{padding:19px 15px}.term-card h2{font-size:24px;line-height:1.5;margin:16px 0 12px}.term-card p{font-size:12px}.term-card>span{font-size:9px}.term-category{font-size:8px}.flashcard{min-height:280px;padding:32px 22px}.flashcard strong{font-size:31px}.flashcard>span:not(.flashcard-kicker){font-size:12px}.flashcard-actions{gap:7px}.flashcard-actions button{font-size:10px;padding:9px}.guide-note{padding:23px}.guide-title{gap:16px}.guide-title>span{font-size:37px}.guide-title h2{font-size:21px}.guide-note li p{font-size:11px}.pitfall{padding:16px}.guide-outline>button{font-size:11px;padding:10px}.guide-note{scroll-margin-top:85px}.review-summary{padding:22px;gap:24px}.review-summary>div{min-width:0;column-gap:10px}.review-summary>div .icon{width:24px}.review-summary strong{font-size:28px}.review-summary span{font-size:9px}.review-row{padding:20px;gap:15px}.review-meta{gap:8px;flex-wrap:wrap;font-size:8px}.review-row h2{font-size:13px}.review-row>div{flex:1}.review-row .button{margin-left:0;width:100%;font-size:11px}.review-icon{width:33px;height:33px}.attempt-title strong{font-size:11px}.attempt-score{font-size:21px}.attempt-score small{font-size:10px}.attempt-row{gap:10px}.attempt-title small{font-size:8px}.attempt-list{padding:18px}.draft-row{padding:21px;gap:12px;flex-wrap:wrap}.draft-row h3{font-size:14px}.draft-row .button{font-size:11px}.auth-layout{margin:5px 0 28px;border-radius:12px}.auth-story{min-height:220px;padding:27px}.auth-story h1{font-size:28px;line-height:1.55;margin:15px 0 11px}.auth-story p{font-size:10px}.auth-story>.auth-note{font-size:9px;padding-top:20px}.auth-layout .form{padding:27px}.auth-layout .form h2{font-size:23px;margin-bottom:23px}.auth-layout .form label{font-size:11px}.auth-layout .form input{font-size:12px}.account-hero{padding:24px;gap:20px;flex-wrap:wrap}.account-profile{gap:16px}.account-avatar{width:53px;height:53px;font-size:23px;border-radius:15px}.account-profile h1{font-size:25px;margin:5px 0}.account-profile p{font-size:10px}.account-hero>button{margin-left:69px;padding:6px 12px;min-height:34px}.account-quicklinks .panel{padding:20px}.hero{padding:25px}.hero h1{font-size:28px}.card{padding:22px}.card h2{font-size:20px}.grid{grid-template-columns:1fr}.foot{flex-direction:column;gap:18px;margin-top:32px;padding-top:23px}.foot>p{text-align:left;max-width:none;font-size:8px}.foot>div small{font-size:8px}.foot .brand-mark{width:25px;height:25px}.foot strong{font-size:10px}}
@media(max-width:370px){.workspace main{padding:20px 14px}.topbar{padding:0 14px}.study-hero{padding:27px 21px}.study-hero h1{font-size:25px}.hero-bottom{font-size:7px;gap:8px}.welcome-line span:last-child{font-size:8px}.overview-stat{padding:0 12px;gap:8px}.overview-stat span:not(.stat-icon){font-size:9px}.overview-stat small{font-size:7px}.library-grid{gap:12px}.topic-grid,.term-grid{grid-template-columns:1fr}.topic-card h2,.topic-card>p,.topic-card>.eyebrow{min-height:0}.topic-card>p{margin-bottom:23px}.library-body{padding:14px 11px 0}.library-body h2{font-size:12px}.paper-facts{font-size:7px;gap:8px}.favorite-button{right:7px}.cover-number{font-size:40px}.cover-label{max-width:75px}.auth-layout .form{padding:23px}.flashcard-actions{flex-wrap:wrap}.flashcard-actions button{flex:1}.flashcard-actions #know-term{order:3;flex-basis:100%}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* Account recovery uses the existing form/card system. */
.password-form{max-width:640px}.reset-code{width:100%;font-family:monospace;font-size:14px}.sidebar nav a span{min-width:0;line-height:1.45}.password-form[hidden]{display:none}
.sidebar .nav-level{display:block;font-size:.8em;white-space:nowrap;opacity:.85}

/* Teacher Onboarding Demo Modal Styles */
.teacher-demo-dialog{max-width:820px;width:calc(100% - 32px);padding:0;border:1px solid #d4deda;border-radius:18px;background:#ffffff;box-shadow:0 30px 90px rgba(20,45,55,0.35);color:#243e47;overflow:hidden}
.teacher-demo-dialog::backdrop{background:rgba(18,44,52,0.65);backdrop-filter:blur(4px)}
.teacher-demo-shell{display:flex;flex-direction:column;max-height:88dvh}
.demo-header{padding:24px 28px 16px;background:linear-gradient(135deg,#1f3842,#2d4c57);color:#fff;display:flex;justify-content:space-between;align-items:flex-start;gap:16px}
.demo-badge{display:inline-block;font-size:11px;font-weight:700;letter-spacing:.12em;background:rgba(173,131,84,0.3);color:#e2ba8c;padding:3px 9px;border-radius:4px;margin-bottom:8px}
.demo-header h2{font-size:22px;margin:0 0 4px;color:#fff;font-weight:650;letter-spacing:-.02em}
.demo-subtitle{font-size:13px;color:#b2c7cc;margin:0;line-height:1.5}
.demo-close{background:none;border:0;color:#c0d2d6;font-size:20px;cursor:pointer;padding:4px 8px;min-height:32px;line-height:1;border-radius:6px}
.demo-close:hover{background:rgba(255,255,255,0.15);color:#fff}
.demo-body{padding:24px 28px;overflow-y:auto;flex:1}
.demo-card{background:#f9fbf9;border:1px solid #e1e9e4;border-radius:12px;padding:20px}
.demo-compare{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.compare-col{padding:16px;border-radius:10px}
.compare-col.old{background:#fdf4f4;border:1px solid #f2d4d4}
.compare-col.old h3{color:#b33a3a;margin:0 0 12px;font-size:15px}
.compare-col.old li{margin-bottom:10px;font-size:12px;color:#613434;line-height:1.6}
.compare-col.new{background:#f0f7f3;border:1px solid #c7e5d2}
.compare-col.new h3{color:#1e7545;margin:0 0 12px;font-size:15px}
.compare-col.new li{margin-bottom:10px;font-size:12px;color:#24533a;line-height:1.6}
.demo-case-header{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px;margin-bottom:16px;padding-bottom:12px;border-bottom:1px solid #e1e9e4}
.demo-score-tag{padding:6px 14px;border-radius:20px;font-weight:650;font-size:13px}
.demo-score-tag.warning{background:#fff1df;color:#9b5a0e;border:1px solid #fedbb0}
.demo-radar-table{display:flex;flex-direction:column;gap:9px}
.radar-row{display:grid;grid-template-columns:90px 140px 1fr 160px;align-items:center;gap:12px;padding:8px 12px;background:#fff;border:1px solid #eaefe9;border-radius:8px;font-size:12px}
.radar-row .sec-id{font-weight:700;color:#6c7a7e}
.radar-row .sec-name{font-weight:550;color:#253c43}
.sec-bar-wrap{background:#ecefe9;height:10px;border-radius:6px;overflow:hidden}
.sec-bar{background:#2a9d62;height:100%;border-radius:6px}
.sec-bar.danger{background:#d94545}
.sec-bar.warning{background:#d99126}
.sec-score{font-weight:600;text-align:right}
.text-danger{color:#c92a2a;font-weight:700}
.text-warning{color:#b86c00;font-weight:600}
.demo-tip{margin-top:16px;background:#eef5f8;border-left:4px solid #337a91;padding:12px 16px;border-radius:6px;font-size:12px;line-height:1.7;color:#1d4c5c}
.demo-drilldown{background:#fff;border:1px solid #e0e7e2;border-radius:10px;padding:16px;margin-bottom:16px}
.drilldown-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
.drilldown-title h4{margin:0;font-size:14px;color:#223c44}
.tag.danger{background:#ffe3e3;color:#c92a2a;padding:3px 10px;border-radius:12px;font-size:11px;font-weight:700}
.mistake-item{display:flex;gap:12px;padding:10px 0;border-top:1px dashed #e2e8e3;font-size:12px}
.q-badge{background:#e7ece6;color:#354a4f;padding:4px 8px;border-radius:6px;font-weight:700;height:fit-content;white-space:nowrap}
.mistake-desc{margin:0 0 6px;line-height:1.6}
.mistake-reason{margin:0 0 6px;line-height:1.6}
.mistake-guidance{margin:0;color:#1e7545;font-weight:550}
.demo-prescribe{background:#edf6f1;border:1px solid #c2e2d0;border-radius:10px;padding:16px}
.prescribe-arrow{font-size:13px;font-weight:700;color:#1d663e;margin-bottom:8px}
.prescribe-box strong{font-size:13px;color:#1a4d33}
.action-pills{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}
.pill{background:#fff;border:1px solid #9dcbb1;color:#1a5937;padding:7px 12px;border-radius:8px;font-size:12px;font-weight:600}
.chart-timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:16px 0}
.timeline-step{background:#fff;border:1px solid #e1e7e2;border-radius:10px;padding:12px;text-align:center;display:flex;flex-direction:column;gap:6px}
.timeline-step.highlight{background:#f1f9f4;border-color:#a5d8b7}
.step-label{font-size:11px;font-weight:600;color:#6d797c}
.step-score{font-size:20px;font-weight:800}
.step-score.danger{color:#cf3b3b}
.step-score.success{color:#1e884d}
.step-score.gold{color:#ad8354}
.step-status{font-size:10px;color:#55666b;line-height:1.4}
.guidance-card{padding:14px 18px;border-radius:10px;font-size:12px}
.guidance-card.green{background:#f4f9f6;border-left:4px solid #238b52;color:#1c4d34}
.guidance-card.green h4{margin:0 0 8px;font-size:13px;color:#1b5735}
.guidance-card.blue{background:#f0f7fb;border-left:4px solid #1976d2;color:#154a75}
.guidance-card.blue h4{margin:0 0 8px;font-size:13px;color:#135080}
.guidance-card ul{margin:0;padding-left:18px}
.guidance-card li{margin-bottom:6px;line-height:1.6}
.benefit-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:16px 0}
.benefit-item{display:flex;gap:12px;background:#fff;border:1px solid #dbe5e0;border-radius:10px;padding:14px;align-items:flex-start}
.benefit-icon{font-size:24px;flex-shrink:0}
.benefit-item strong{display:block;font-size:13px;color:#1f3a42;margin-bottom:4px}
.benefit-item p{margin:0;font-size:11px;color:#607175;line-height:1.5}
.welcome-note{background:#f7f6ed;border:1px solid #e5dcbd;padding:12px 16px;border-radius:8px;font-size:12px;color:#675735}
.demo-footer{padding:16px 28px;background:#fcfdfa;border-top:1px solid #e2e8e2;display:flex;justify-content:space-between;align-items:center;gap:16px}
.demo-dots{display:flex;gap:8px}
.demo-dot{width:10px;height:10px;border-radius:50%;background:#dbe2de;transition:all .2s}
.demo-dot.active{background:#253e47;width:24px;border-radius:10px}
.demo-dot.passed{background:#ad8354}
.demo-actions{display:flex;gap:10px}
@media(max-width:680px){
 .radar-row{grid-template-columns:1fr;gap:6px}
 .demo-compare{grid-template-columns:1fr}
 .chart-timeline{grid-template-columns:1fr 1fr}
 .benefit-grid{grid-template-columns:1fr}
}