:root{
  --bg:#F4F6F8; --card:#fff; --line:#E2E6EB; --line2:#C9D1DC; --ink:#151A21; --muted:#566070;
  --accent:#1659D6; --accent-soft:rgba(22,89,214,.10); --ok:#0A6B42; --ok-bg:#E6F4EC; --err:#B3261E; --err-bg:#FBEAE9; --warn-bg:#FFF4D6; --warn:#7A5600;
  --track:#E6EAF0; --chip:#EEF1F5;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;font-size:16px;line-height:1.45}
a{color:var(--accent)}
h1,h2,h3{margin:0;letter-spacing:-.01em}
h1{font-size:28px;font-weight:700;letter-spacing:-.02em}
h2{font-size:18px;font-weight:700}
p{margin:0}
.muted{color:var(--muted)}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}
[hidden]{display:none!important}

/* thanh trên */
.top{background:#fff;border-bottom:1px solid var(--line);padding-top:env(safe-area-inset-top)}
.top-in{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;padding-top:14px;padding-bottom:10px}
.brand{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none;font-size:20px;font-weight:700;letter-spacing:-.01em}
.logo{width:40px;height:40px;border-radius:12px;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center}
.top-right{display:flex;align-items:center;gap:10px}
.chip{display:inline-flex;align-items:center;gap:8px;padding:7px 14px;border-radius:999px;background:var(--chip);color:var(--muted);font-size:14px}
.tabs{display:flex;gap:6px;overflow-x:auto;padding-bottom:10px;-webkit-overflow-scrolling:touch}
.tabs a{flex:0 0 auto;display:flex;align-items:center;min-height:44px;padding:0 16px;border-radius:12px;color:var(--muted);text-decoration:none;font-weight:600;font-size:15px}
.tabs a.on{background:var(--accent-soft);color:var(--accent)}

/* nút */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 22px;border:1px solid var(--line2);border-radius:12px;background:#fff;color:var(--ink);font:inherit;font-size:15px;font-weight:600;cursor:pointer;text-decoration:none}
.btn.sm{min-height:44px;padding:0 16px}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn.dark{background:var(--ink);border-color:var(--ink);color:#fff}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn.big{min-height:60px;font-size:17px;border-radius:14px;width:100%}
.icon-btn{width:44px;height:44px;flex:0 0 auto;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line2);border-radius:12px;background:#fff;color:var(--muted);cursor:pointer}
.link{background:none;border:0;color:var(--accent);font:inherit;font-weight:600;font-size:15px;min-height:44px;padding:0 8px;cursor:pointer}

/* khối */
.main{padding-top:24px;padding-bottom:56px;display:flex;flex-direction:column;gap:20px}
.card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:22px}
.card-head{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:6px 12px;padding-bottom:10px}
.cols{display:flex;flex-wrap:wrap;gap:20px;align-items:stretch}
.col-main{flex:999 1 540px;min-width:0;display:flex;flex-direction:column;gap:20px}
.col-side{flex:1 1 300px;min-width:0;display:flex;flex-direction:column;gap:14px}
.notice{padding:14px 16px;border-radius:14px;background:var(--chip);font-size:15px}
.notice.warn{background:var(--warn-bg);color:var(--warn)}
.notice.ok{background:var(--ok-bg);color:var(--ok)}
.notice.err{background:var(--err-bg);color:var(--err)}
.notice a{font-weight:600}

/* vùng thả file */
.drop{background:#fff;border:2px dashed #B3BFD0;border-radius:20px;padding:40px 20px;display:flex;flex-direction:column;align-items:center;gap:14px;text-align:center}
.drop.over{border-color:var(--accent);background:var(--accent-soft)}
.drop .big-ico{width:72px;height:72px;border-radius:50%;background:var(--accent-soft);color:var(--accent);display:flex;align-items:center;justify-content:center}
.drop .big-ico svg{width:32px;height:32px}
.drop p{max-width:420px;color:var(--muted)}
.drop .actions{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;margin-top:6px}

/* ô nhập */
label.f{display:block;font-weight:600;font-size:15px;margin-bottom:8px}
.input,textarea.input{width:100%;min-height:48px;padding:12px 14px;border:1px solid var(--line2);border-radius:12px;font:inherit;font-size:16px;color:var(--ink);background:#fff}
textarea.input{resize:vertical;min-height:72px}
.inline{display:flex;flex-wrap:wrap;gap:12px;align-items:stretch}
.inline .input{flex:1 1 240px;min-width:0}
.hint{font-size:13px;line-height:1.4;color:var(--muted)}
.check{display:flex;align-items:flex-start;gap:12px;min-height:44px;padding:8px 0;cursor:pointer}
.check input{width:22px;height:22px;margin:0;flex:0 0 auto;accent-color:var(--accent)}
.check .t{display:flex;flex-direction:column;gap:2px}
.check .t b{font-weight:600}

/* danh sách file */
.list{display:flex;flex-direction:column}
.row{display:flex;flex-wrap:wrap;align-items:center;gap:12px 14px;padding:14px 0;border-top:1px solid var(--line)}
.row:first-child{border-top:0}
.ico{width:44px;height:44px;flex:0 0 auto;border-radius:12px;background:var(--chip);color:var(--muted);display:flex;align-items:center;justify-content:center}
.ico.acc{background:var(--accent-soft);color:var(--accent)}
.ico.ok{background:var(--ok-bg);color:var(--ok)}
.grow{flex:1 1 220px;min-width:0;display:flex;flex-direction:column;gap:4px}
.name{font-weight:600;overflow-wrap:anywhere}
.sub{font-size:13px;color:var(--muted)}
.sub.err{color:var(--err)}
.sub.ok{color:var(--ok)}
.acts{display:flex;gap:8px;flex:0 0 auto}
.bar{height:8px;border-radius:999px;background:var(--track);overflow:hidden}
.bar i{display:block;height:100%;width:0;border-radius:999px;background:var(--accent);transition:width .2s}
.empty{padding:20px 0 6px;text-align:center;color:var(--muted)}
.textpre{white-space:pre-wrap;overflow-wrap:anywhere;max-height:6.2em;overflow:hidden;font-weight:500}

/* duyệt thư mục */
.bread{display:flex;flex-wrap:wrap;align-items:center;gap:2px 4px;font-size:14px;color:var(--muted)}
.bread button{background:none;border:0;font:inherit;color:var(--muted);cursor:pointer;padding:10px 4px;min-height:44px}
.bread button.cur{color:var(--ink);font-weight:700}
.bread .sep{color:var(--line2)}
.browse-bar{display:flex;align-items:center;justify-content:space-between;gap:8px}
.entry{display:flex;align-items:center;gap:12px;min-height:60px;padding:6px 14px;border:0;border-top:1px solid var(--line);background:#fff;width:100%;text-align:left;font:inherit;color:var(--ink);cursor:pointer}
.entry:first-child{border-top:0}
.entry.sel{background:var(--accent-soft)}
.entry input{width:24px;height:24px;margin:0;flex:0 0 auto;accent-color:var(--accent)}
.entry .grow{flex:1 1 auto}
.entry .chev{color:var(--muted)}
.entry svg.fold{color:var(--accent);flex:0 0 auto}
.browse-card{padding:0;overflow:hidden}
.browse-card.loading{opacity:.55}
.selbar{position:sticky;bottom:0;z-index:5;background:#fff;border-top:1px solid var(--line);padding:12px 24px calc(14px + env(safe-area-inset-bottom));display:flex;align-items:center;gap:14px;margin:0 -24px}
.selbar .btn{flex:1 1 auto;max-width:320px;margin-left:auto}
.selbar .info{display:flex;flex-direction:column}
.selbar .info b{font-size:16px}

/* trang đăng nhập */
.login{max-width:420px;margin:0 auto;padding:40px 20px;display:flex;flex-direction:column;gap:20px}
.login .ring{align-self:center;width:72px;height:72px;border-radius:50%;background:var(--accent-soft);color:var(--accent);display:flex;align-items:center;justify-content:center}
.login .ring svg{width:34px;height:34px}
.login h1{text-align:center;font-size:24px}
.login .sub{text-align:center;font-size:15px}

/* cài đặt */
.addr{display:flex;flex-wrap:wrap;gap:10px;align-items:stretch}
.addr .v{flex:1 1 220px;min-width:0;padding:12px 14px;border-radius:12px;background:var(--chip);font-weight:600;overflow-wrap:anywhere}
.fold-row{display:flex;flex-wrap:wrap;align-items:center;gap:10px 12px;padding:10px 0;border-top:1px solid var(--line)}
.fold-row:first-child{border-top:0}
.fold-row .p{flex:1 1 200px;min-width:0;font-weight:500;overflow-wrap:anywhere}
.pill{padding:4px 10px;border-radius:999px;background:var(--chip);font-size:12px;font-weight:600;color:var(--muted)}
.log-row{display:flex;flex-wrap:wrap;justify-content:space-between;gap:2px 12px;padding:9px 0;border-top:1px solid var(--line);font-size:15px}
.log-row:first-child{border-top:0}
.savebar{position:sticky;bottom:0;background:linear-gradient(to top,var(--bg) 70%,rgba(244,246,248,0));padding:16px 0 calc(8px + env(safe-area-inset-bottom));display:flex;gap:12px;align-items:center}

.toast{position:fixed;left:50%;bottom:calc(24px + env(safe-area-inset-bottom));transform:translate(-50%,20px);opacity:0;pointer-events:none;background:var(--ink);color:#fff;padding:12px 18px;border-radius:12px;font-size:15px;max-width:calc(100vw - 32px);transition:all .2s;z-index:50}
.toast.show{opacity:1;transform:translate(-50%,0)}

@media (max-width:600px){
  .wrap{padding:0 16px}
  .selbar{margin:0 -16px;padding-left:16px;padding-right:16px}
  h1{font-size:24px}
  .card{padding:18px;border-radius:18px}
  .drop{padding:28px 16px}
  .row .acts{width:100%}
  .row .acts .btn{flex:1}
}

.entry-nav{display:flex;align-items:center;gap:12px;flex:1 1 auto;min-height:56px;border:0;background:none;font:inherit;color:var(--ink);text-align:left;cursor:pointer;padding:0}
.modal-back{position:fixed;inset:0;background:rgba(21,26,33,.45);display:flex;align-items:center;justify-content:center;padding:16px;z-index:40}
.modal{background:#fff;border-radius:20px;width:100%;max-width:560px;max-height:calc(100vh - 32px);display:flex;flex-direction:column;gap:12px;padding:20px}
.modal h2{margin:0}
.modal .pick-list{overflow:auto;border:1px solid var(--line);border-radius:12px;min-height:200px;flex:1 1 auto}
.modal-foot{display:flex;gap:10px;justify-content:flex-end;flex-wrap:wrap}

.view-link{display:inline-flex;align-items:center;gap:6px;min-height:44px;padding:0 12px;border-radius:12px;border:1px solid var(--line);background:#fff;color:var(--accent);font-weight:600;font-size:15px;text-decoration:none;flex:0 0 auto}

/* ---------- nghe âm thanh ---------- */
.listen{display:flex;flex-direction:column;align-items:center;text-align:center;gap:14px;padding:28px 20px}
.listen h1{margin:0}
.play-btn{width:96px;height:96px;border-radius:50%;border:0;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 8px 24px rgba(22,89,214,.3)}
.play-btn.on{background:var(--ink)}
.seg{display:flex;gap:8px;width:100%;max-width:420px}
.seg label{flex:1}
.seg input{position:absolute;opacity:0}
.seg span{display:flex;flex-direction:column;align-items:center;gap:2px;padding:10px;border:1px solid var(--line);border-radius:12px;font-weight:600;cursor:pointer}
.seg small{font-weight:400;color:var(--muted);font-size:13px}
.seg input:checked+span{border-color:var(--accent);background:var(--accent-soft);color:var(--accent)}
.seg input:focus-visible+span{outline:2px solid var(--accent);outline-offset:2px}

/* ---------- điều khiển ---------- */
.rc-body{background:#0E1116;color:#fff;overscroll-behavior:none}
.rc{position:fixed;inset:0;display:flex;flex-direction:column}
.rc-top,.rc-bar{display:flex;align-items:center;gap:8px;padding:6px 10px;background:#151A21;flex:0 0 auto}
.rc-top{padding-top:calc(6px + env(safe-area-inset-top))}
.rc-bar{padding-bottom:calc(6px + env(safe-area-inset-bottom))}
.rc-back{color:#fff;text-decoration:none;font-size:30px;line-height:1;min-width:36px;min-height:40px;display:flex;align-items:center;justify-content:center}
.rc-status{flex:1;font-size:13px;color:#AEB6C2;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.rc-top select{background:#232A34;color:#fff;border:1px solid #333C48;border-radius:10px;min-height:40px;padding:0 8px;font:inherit;font-size:14px}
.rc-btn{min-width:44px;min-height:44px;border-radius:12px;border:1px solid #333C48;background:#232A34;color:#fff;font:inherit;font-size:15px;font-weight:600;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;padding:0 10px}
.rc-btn.wide{flex:1}
.rc-btn[aria-pressed="true"]{background:#1659D6;border-color:#1659D6}
.rc-view{position:relative;flex:1 1 auto;overflow:hidden;touch-action:none;background:#0E1116}
.rc-stage{position:absolute;left:0;top:0;transform-origin:0 0;will-change:transform}
.rc-stage img{display:block;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none;pointer-events:none}
.rc-cursor{position:absolute;width:14px;height:14px;margin:-7px 0 0 -7px;border-radius:50%;border:2px solid #fff;background:rgba(22,89,214,.85);box-shadow:0 0 0 1px #000;pointer-events:none}
.rc-msg{position:absolute;left:16px;right:16px;top:40%;text-align:center;background:rgba(21,26,33,.92);border-radius:14px;padding:16px;font-size:15px;line-height:1.5}
.rc-keys{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;padding:8px 10px;background:#151A21;border-top:1px solid #232A34;flex:0 0 auto}
.rc-keys button{min-height:42px;border-radius:10px;border:1px solid #333C48;background:#232A34;color:#fff;font:inherit;font-size:14px;cursor:pointer}
.rc-keys button:active,.rc-btn:active{background:#2E3846}
#rcInput{position:fixed;left:0;bottom:0;width:1px;height:1px;opacity:0;font-size:16px;border:0;padding:0;resize:none}
.lvl{width:100%;max-width:420px;height:8px;border-radius:4px;background:var(--line);overflow:hidden}
.lvl i{display:block;height:100%;width:0;background:var(--ok);transition:width .1s}

/* ---------- YouTube ---------- */
.yt{display:flex;flex-direction:column;gap:12px}
.yt h2{margin:0}
.yt-now{padding:12px;border-radius:12px;background:var(--accent-soft)}
.yt-title{font-weight:600}
.yt-ad{display:flex;flex-direction:column;gap:10px;padding:14px;border-radius:12px;background:var(--warn-bg);color:var(--warn)}
.yt-ctl{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
.yt-ctl .btn{min-height:46px;font-size:14px;padding:0 6px}
.yt-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.yt-item{display:flex;gap:10px;align-items:flex-start;width:100%;text-align:left;padding:6px;border:1px solid var(--line);border-radius:12px;background:var(--card);font:inherit;color:var(--ink);cursor:pointer}
.yt-item.on{border-color:var(--accent);background:var(--accent-soft)}
.yt-item img{width:128px;height:72px;object-fit:cover;border-radius:8px;flex:0 0 auto;background:var(--line)}
.yt-item .t{display:flex;flex-direction:column;gap:4px;min-width:0}
.yt-item b{font-weight:600;font-size:15px;line-height:1.3;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.yt-item small{color:var(--muted);font-size:13px}
#ytForm{flex-wrap:nowrap}
#ytForm .input{flex:1 1 auto;min-width:0}

/* điều khiển: chế độ, toàn màn hình, nói chuyện */
.rc-bar{flex-direction:column;align-items:stretch;gap:6px}
.rc-row{display:flex;gap:6px;align-items:center}
.rc-zl{min-width:36px;text-align:center;font-size:14px;color:#AEB6C2}
.rc-btn.ic{width:40px;min-width:40px;min-height:40px;padding:0;flex:0 0 auto}
.rc-top select{max-width:76px}
.rc-handle,.rc-exitfull{display:none}
.rc.nobar .rc-bar{display:none}
.rc.full .rc-top{position:absolute;left:0;right:0;top:0;z-index:5;transform:translateY(-110%);transition:transform .15s}
.rc.full .rc-bar{position:absolute;left:0;right:0;bottom:0;z-index:5;transform:translateY(110%);transition:transform .15s}
.rc.full.peek .rc-top,.rc.full.peek .rc-bar{transform:none}
.rc.full .rc-handle{display:block;position:absolute;top:env(safe-area-inset-top);left:50%;transform:translateX(-50%);width:96px;height:30px;border:0;background:transparent;z-index:4;padding:0}
.rc.full .rc-handle::after{content:"";position:absolute;left:50%;top:8px;width:44px;height:5px;margin-left:-22px;border-radius:3px;background:rgba(255,255,255,.75);box-shadow:0 0 0 1px rgba(0,0,0,.5)}
.rc.full .rc-exitfull{display:block;position:absolute;right:8px;top:calc(6px + env(safe-area-inset-top));z-index:4;min-height:34px;padding:0 10px;border-radius:10px;border:1px solid rgba(255,255,255,.35);background:rgba(14,17,22,.55);color:#fff;font:inherit;font-size:13px;font-weight:600}
.rc.full.peek .rc-exitfull{display:none}
.rc-talk{position:absolute;left:50%;top:10px;transform:translateX(-50%);display:flex;align-items:center;gap:8px;padding:6px 12px;border-radius:999px;background:rgba(180,35,24,.9);color:#fff;font-size:13px;font-weight:600;z-index:3;pointer-events:none}
.rc-talk-dot{width:8px;height:8px;border-radius:50%;background:#fff;animation:rcblink 1s infinite}
@keyframes rcblink{50%{opacity:.3}}
#rcTalk[aria-pressed="true"]{background:#B42318;border-color:#B42318}
.rc-cursor{width:18px;height:18px;margin:-9px 0 0 -9px}

.yt-pl{display:flex;flex-direction:column;gap:10px;padding:12px;border-radius:12px;background:var(--accent-soft)}
.yt-pl input[type=range]{width:100%;margin:0}
#ytMode{max-width:none}
#ytMode small{text-align:center}
.yt-resume{display:flex;gap:12px;align-items:center;justify-content:space-between;padding:12px;border-radius:12px;background:var(--accent-soft)}
.yt-resume b{display:block}
.yt-hist summary{cursor:pointer;font-weight:600;padding:8px 0}
.yt-hist .yt-list{margin:6px 0 10px}
.yt-item .pos{color:var(--accent);font-size:13px;font-weight:600}