:root{--ink:#48233d;--muted:#896e7d;--pink:#b53e7c;--pink-dark:#8e2f65;--line:#ead6e1;--paper:rgba(255,255,255,.96);--shadow:0 10px 28px rgba(91,32,67,.085)}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:Inter,"Segoe UI",Arial,sans-serif;color:var(--ink)}[hidden]{display:none!important}button,input,textarea,select{font:inherit}button{cursor:pointer}h1,h2,p{margin-top:0}h1,h2{letter-spacing:-.035em}h2{font-size:19px}p{line-height:1.6}body{background-color:#fff0f6;background-image:linear-gradient(113deg,rgba(255,248,252,.88),rgba(255,242,249,.81)), url('./assets/folkdance-stage.webp');background-size:cover;background-attachment:fixed;background-position:center}
.shell{min-height:100vh;display:flex}.sidebar{width:243px;flex:0 0 243px;position:sticky;top:0;align-self:flex-start;height:100vh;padding:28px 16px;background:linear-gradient(155deg,#743151 0%,#592441 58%,#41243f 100%);color:white;display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:11px;margin:0 0 60px;padding:0 3px}.brand-mark{width:44px;height:44px;background:#df75a6;border-radius:12px;display:grid;place-items:center;font-size:28px}.brand strong{display:block;font-size:21px;letter-spacing:-.045em}.brand small{font-size:8px;letter-spacing:.06em;color:#efd0dd;display:block;margin-top:4px}.sidebar nav{display:grid;gap:7px}.nav{display:flex;align-items:center;gap:12px;border:0;color:#f4dce7;background:transparent;text-align:left;padding:14px 13px;border-radius:10px;font-weight:670;font-size:14px;white-space:nowrap}.nav span{font-size:16px;width:20px}.nav:hover{background:#ffffff15}.nav.active{color:white;background:#af4f7e;box-shadow:inset 3px 0 #ffc5da}.sidebar-end{margin-top:auto;font-size:12px;color:#e7c7d7;line-height:1.7;padding:0 7px}.sidebar-end .line{display:block;height:1px;background:#ffffff2b;margin-bottom:18px}
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.page{display:none;min-height:70vh;padding:0 0 12px}.page.active{display:block}.heading{padding:32px 0 24px}.heading h1{font-weight:830;font-size:clamp(28px,3.15vw,42px);margin:0 0 10px}.heading p{font-size:14px;color:var(--muted);margin:0}.card{background:var(--paper);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}.field{display:flex;flex-direction:column;gap:8px;min-width:0}.field label{font-size:12px;color:#765769;font-weight:760}.field input:not([type=file]),.field select,.field textarea{width:100%;min-height:43px;padding:11px;border:1px solid #e2d2db;border-radius:10px;background:#fff;color:var(--ink);outline:none}.field textarea{resize:vertical}.field input:focus,.field select:focus,.field textarea:focus{border-color:#c66494;box-shadow:0 0 0 3px #f6daea}.field input[type=file]{width:100%;border:1px dashed #dcb5ca;background:#fff7fb;border-radius:10px;padding:13px;font-size:13px}.field.short{width:145px}.grow{flex:1;min-width:0}.btn{display:inline-flex;align-items:center;justify-content:center;text-align:center;min-height:44px;padding:10px 16px;border-radius:10px;font-size:13px;font-weight:750;border:1px solid transparent;transition:transform .15s,background .15s}.btn:not(:disabled):hover{transform:translateY(-1px)}.btn:disabled{opacity:.46;cursor:not-allowed}.btn.primary{background:var(--pink);color:white}.btn.primary:hover{background:var(--pink-dark)}.btn.secondary{background:#fff;color:#9b3e73;border-color:#e8bed3}.btn.danger{background:#bb5059;color:white}.btn.wide{min-width:240px}.button-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.toolbar{display:flex;align-items:flex-end;gap:14px;padding:18px 21px;margin-bottom:17px}.toolbar .field{margin-bottom:0}
.video-grid,.review-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.video-card{padding:17px}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:0 0 15px}.section-heading h2{margin:0}.tag{display:inline-flex;align-items:center;justify-content:center;padding:6px 10px;border-radius:8px;background:#fce6f0;color:#9b3971;font-size:10px;font-weight:800;white-space:nowrap}.video-box{position:relative;aspect-ratio:16/9;background:#32243a;border-radius:13px;overflow:hidden;display:flex;align-items:center;justify-content:center}.video-box video{width:100%;height:100%;object-fit:contain}.video-box canvas{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}.mirror video,.mirror canvas{transform:scaleX(-1)}.empty-video{position:absolute;inset:0;display:grid;place-content:center;text-align:center;font-size:13px;color:#e9d2df;pointer-events:none;padding:20px}.live-score{position:absolute;left:12px;top:12px;padding:9px 12px;border-radius:9px;background:#743151e8;color:white;font-weight:750}.hint{font-size:12px;color:var(--muted);line-height:1.6;margin:10px 0 0}.actions{margin-top:17px;padding:18px 22px;display:flex;align-items:center;justify-content:space-between;gap:20px}.actions strong{font-size:16px}.actions p{font-size:12px;color:var(--muted);margin:4px 0}.progress{height:6px;background:#f4e2ec;border-radius:30px;overflow:hidden;margin-top:11px}.progress span{display:block;width:0;height:100%;background:var(--pink);transition:.2s}
.form{padding:23px;margin-bottom:18px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:19px}.check{display:flex;align-items:flex-start;gap:10px;font-size:12px;color:#775a6a;line-height:1.5;margin:14px 0}.check input{accent-color:var(--pink);margin-top:3px}.contextual{display:flex;justify-content:center;background:#fff6fa;padding:12px 18px;border-radius:11px;color:#a24073;font-size:13px}.contextual small{color:var(--muted);font-size:11px}
.library-head{margin:0 0 16px}.count{background:#fbe4f0;padding:3px 8px;color:#a63c75;border-radius:30px;font-size:11px;margin-left:4px}.library-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-bottom:24px}.library-entry{display:flex;gap:13px;align-items:center;padding:17px;min-width:0}.library-entry .icon{display:grid;place-items:center;background:#fbe5ef;border-radius:12px;width:46px;height:46px;font-size:22px;color:#a84679;flex-shrink:0}.library-entry .details{flex:1;min-width:0}.library-entry .details strong{font-size:15px;overflow-wrap:anywhere}.library-entry p{font-size:11px;color:var(--muted);margin:5px 0 0}.entry-buttons{display:flex;gap:7px;flex-wrap:wrap}.mini{border:1px solid #e5c3d3;background:#fff;color:#a33c76;border-radius:8px;padding:8px 10px;font-size:11px;cursor:pointer}.mini.remove{color:#b44e5b}
.tabs{display:flex;border-bottom:1px solid #eacddb;gap:8px;margin:-3px 0 18px}.tab{padding:13px 18px;border:0;background:transparent;color:#80536e;font-weight:700;font-size:14px;border-bottom:3px solid transparent}.tab.active{color:#a33873;border-color:#b3407d}.metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin-bottom:16px}.metric{padding:19px 20px}.metric small{color:#8b95a1;font-weight:800;font-size:10px;letter-spacing:.06em}.metric strong{color:#aa3e74;font-size:35px;display:block;margin:10px 0 5px}.metric span{font-size:11px;color:var(--muted)}.report-card{padding:20px 22px;margin-bottom:16px}.score-grid,.tracking-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:11px}.score-grid>div,.tracking-grid>div{border:1px solid #f3dfe8;background:#fff8fb;padding:13px;border-radius:11px}.score-grid small,.tracking-grid small{font-size:11px;color:#947787;display:block}.score-grid strong,.tracking-grid strong{display:block;font-size:25px;color:#a53a76;margin-top:7px}.score-grid strong.smaller{font-size:14px;line-height:1.4}.review-actions{margin-top:15px}.legend{display:flex;gap:14px;flex-wrap:wrap;margin:20px 0 10px;font-size:11px;color:#806979}.legend span{display:inline-flex;align-items:center;gap:6px}.legend i{width:11px;height:11px;border-radius:3px}.event-list,.advice-list,.history-list{display:grid;gap:9px}.event-item{display:flex;align-items:center;justify-content:space-between;gap:15px;background:#fff8fb;border:1px solid #f0dbe6;border-radius:11px;padding:12px 14px;text-align:left;font-size:13px;color:#72445c}.event-item small{color:#af5781;font-weight:700}.event-item:hover{background:#fbe6f0}.advice-item{display:flex;gap:12px;align-items:flex-start;border:1px solid #f1dce7;border-radius:12px;padding:15px;background:#fffafe}.advice-item .emoji{font-size:20px}.advice-item strong{font-size:13px;color:#87375f}.advice-item p{font-size:13px;color:#6f5c69;margin:5px 0 0}.history-row{display:flex;align-items:center;gap:14px;border:1px solid #f0d7e3;background:#fffbfd;border-radius:12px;padding:14px}.history-row .details{flex:1;min-width:0}.history-row strong{font-size:14px}.history-row p{font-size:11px;color:var(--muted);margin:4px 0}.history-row .score{font-weight:850;color:#a33e72;font-size:19px}.blank{padding:60px 20px;text-align:center}.blank p{font-size:13px;color:var(--muted)}.exports{margin:16px 0 25px}
.guide-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.guide-item{padding:23px}.guide-n{font-weight:850;color:#c36094;font-size:12px;margin-bottom:13px}.guide-item h2{font-size:17px;margin:0 0 8px}.guide-item p{font-size:13px;color:#7c6474;margin-bottom:0}.guide-item.privacy{margin:16px 0}.guide-item.privacy p+p{margin-top:12px}
footer{padding:30px 0;color:#967b8a;font-size:11px}.toast{position:fixed;right:20px;bottom:20px;z-index:99;background:#532746;color:white;border-radius:10px;padding:13px 17px;font-size:13px;max-width:390px;opacity:0;transform:translateY(10px);pointer-events:none;transition:.2s;box-shadow:0 8px 35px #56244335}.toast.visible{opacity:1;transform:translateY(0)}.toast.error{background:#ad4751}
@media(max-width:1180px){main{padding:0 20px}.score-grid,.tracking-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.library-list{grid-template-columns:1fr}}@media(max-width:890px){.sidebar{width:210px;flex-basis:210px}.brand small{font-size:7px}.nav{padding:12px 9px;font-size:12px}main{width:calc(100% - 210px)}.video-grid,.review-grid,.metrics{grid-template-columns:1fr}.toolbar{flex-wrap:wrap}.toolbar .grow{flex-basis:65%}}
@media(max-width:680px){body{background-attachment:scroll}.shell{display:block}.sidebar{width:100%;height:auto;position:relative;padding:13px}.brand{margin-bottom:9px}.sidebar nav{display:flex;overflow-x:auto;gap:5px}.sidebar-end{display:none}.nav{font-size:12px;padding:10px;flex-shrink:0}.nav span{width:auto}.topbar{font-size:8px;min-height:60px;height:auto;padding:12px 0}.topbar>span{max-width:60%}main{width:100%;padding:0 14px}.heading{padding:27px 0 21px}.heading h1{font-size:28px}.form-grid,.guide-grid{grid-template-columns:1fr}.toolbar,.actions{flex-direction:column;align-items:stretch}.field.short{width:100%}.history-row{flex-wrap:wrap}.metric{padding:16px}.metric strong{font-size:31px}.score-grid,.tracking-grid{gap:7px}.score-grid>div,.tracking-grid>div{padding:10px}.section-heading{flex-wrap:wrap}}
@media print{body{background:#fff!important}.sidebar,.topbar,footer,.btn,.tabs,.toast,.exports,#page-practice,#page-group,#page-library,#page-guide,#report-history,.review-actions{display:none!important}main{width:100%;padding:0}.page{display:none!important}#page-report,#report-current{display:block!important}.card{box-shadow:none;break-inside:avoid}.report-card{padding:14px}.video-box{display:none}}

/* FolkDance 3.1: two ways to add teaching materials to the same R2 library. */
.library-inputs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));align-items:start;gap:16px}
.library-inputs .form{height:100%;min-width:0}
.library-inputs .field{margin-bottom:15px}
.library-inputs .library-form-intro{margin:0 0 20px;min-height:39px}
.library-inputs .button-row{align-items:center;flex-wrap:wrap}
.link-action{display:inline-flex;align-items:center;text-decoration:none;font-weight:650}
@media(max-width:1000px){.library-inputs{grid-template-columns:1fr}.library-inputs .library-form-intro{min-height:0}}

.reference-embed{position:absolute;inset:0;width:100%;height:100%}
.reference-embed iframe{display:block;border:0;width:100%;height:100%}
.reference-embed[hidden]{display:none}



/* Trang giới thiệu dạng bài báo — MV R2 và hướng dẫn ở cuối trang. */
.folkdance-about{padding-bottom:25px}
.folkdance-about-heading{max-width:920px;margin:0 auto;padding-bottom:23px}
.folkdance-about-kicker{font-size:10px!important;letter-spacing:.17em!important;font-weight:800;color:#af4b80!important;margin-bottom:13px!important}
.folkdance-about-heading h1{font-size:clamp(30px,4vw,48px);line-height:1.12;margin:0 0 13px}
.folkdance-about-tagline{font-size:clamp(16px,1.75vw,21px)!important;font-weight:670;color:#9f4377!important;line-height:1.55!important}
.folkdance-feature-article{max-width:920px;margin:0 auto 40px;padding:clamp(24px,5vw,56px);background:rgba(255,253,255,.97);border-color:#edd4e0}
.folkdance-feature-article>p{font-size:15.5px;line-height:2.02;color:#644d5b;margin:0 0 21px;text-align:justify;hyphens:auto}
.folkdance-feature-article>p strong{color:#893d69}
.folkdance-feature-article>.folkdance-article-lead{font-size:18px;line-height:1.89;color:#572f47;font-weight:520}
.folkdance-pullquote{position:relative;margin:30px 0;padding:24px 27px 24px 30px;background:#fff0f6;border-left:4px solid #c65c93;border-radius:0 13px 13px 0;color:#8a3667;font-size:18px;font-weight:600;line-height:1.7;font-style:italic}
.folkdance-editorial-media{max-width:625px;margin:30px auto 34px}
.folkdance-editorial-video-shell{aspect-ratio:16 / 9;overflow:hidden;background:#2a1d2d;border-radius:13px;display:flex;justify-content:center;align-items:center;box-shadow:0 10px 28px #421f3b2b}
.folkdance-editorial-video-shell video{display:block;width:100%;height:100%;object-fit:contain}
.folkdance-editorial-video-placeholder{color:#e5cbd9;max-width:300px;text-align:center;font-size:14px;line-height:1.7;padding:24px}
.folkdance-mv-admin{margin:11px auto 0;max-width:625px;border:1px solid #eed5e1;background:#fff8fb;border-radius:11px;padding:10px 16px;font-size:12px;color:#844b68}
.folkdance-mv-admin summary{cursor:pointer;font-weight:700;color:#a4457d;list-style:revert}
.folkdance-mv-form{padding:13px 0 5px}.folkdance-mv-form .field{margin:15px 0 6px}.folkdance-mv-form .hint{margin:6px 0 0}.folkdance-mv-form .button-row .hint{flex:1;min-width:170px}
.folkdance-feature-article>.folkdance-article-signoff{text-align:center;color:#9c4277;font-size:17px;font-weight:690;margin:34px 0 0;line-height:1.75}
.folkdance-guide-bottom{max-width:920px;margin:0 auto 25px;scroll-margin-top:20px}
.folkdance-guide-heading{padding:0 0 18px}.folkdance-guide-heading h2{font-size:clamp(25px,2.5vw,33px);color:#66314d;margin-bottom:8px}.folkdance-guide-heading p{color:#806a77;font-size:13px;margin-bottom:0}
.folkdance-guide-flow{display:grid;grid-template-columns:1fr 1fr;gap:13px}
.folkdance-guide-step{display:flex;align-items:flex-start;gap:15px;padding:20px 19px;min-width:0}
.folkdance-guide-step h3{font-size:15px;line-height:1.45;margin:0 0 9px;color:#713451}
.folkdance-guide-step p{font-size:12.5px;line-height:1.76;color:#776371;margin:0}
.folkdance-guide-icon{flex:0 0 36px;height:36px;border-radius:10px;background:#fae5ef;color:#a33c76;display:grid;place-items:center;font-size:18px}
.folkdance-guide-note{margin-top:17px;border-radius:12px;background:#fcebf3;border:1px solid #f1d2e1;color:#795568;padding:15px 19px;font-size:12px;line-height:1.75}
@media(max-width:900px){.folkdance-guide-flow{grid-template-columns:1fr}.folkdance-feature-article>p{text-align:left}}
@media(max-width:680px){.folkdance-feature-article{padding:21px 19px}.folkdance-feature-article>p{font-size:14px;line-height:1.85}.folkdance-feature-article>.folkdance-article-lead{font-size:16px}.folkdance-pullquote{font-size:16px;padding:18px 18px 18px 22px}.folkdance-editorial-media{margin:22px -5px 27px}.folkdance-mv-admin{padding:10px 14px}.folkdance-guide-step{padding:17px 16px}}

/* Vũ điệu di sản - Ẩn thanh đổi MV giới thiệu khỏi trang công khai.
   Chỉ thay đổi hiển thị; video hiện tại vẫn phát bình thường.
   Việc quản lý file MV có thể thực hiện trong Cloudflare R2. */
#intro-mv-admin { display: none !important; }

/* Tên thương hiệu mới: nhãn dài trên thanh điều hướng vẫn hiển thị gọn ở các màn hình. */
.brand{align-items:center}
.brand>div:last-child{flex:1;min-width:0}
.brand strong{font-size:18px;line-height:1.2;overflow-wrap:break-word;letter-spacing:-.025em}
/* MV ngay dưới lời mở đầu, không có tiêu đề, kích thước vừa phải. */
.folkdance-feature-article>.folkdance-editorial-media{max-width:560px;margin:26px auto 34px}
@media(max-width:680px){.brand strong{font-size:17px}.folkdance-feature-article>.folkdance-editorial-media{margin:19px auto 28px}}