:root{
  --bg:#0b0b0d; --bg2:#16161a; --bg3:#1f1f25;
  --fg:#f2f2f5; --dim:#8b8b95; --line:#2a2a32;
  --accent:#0a84ff; --danger:#ff453a;
  --safe-t:env(safe-area-inset-top); --safe-b:env(safe-area-inset-bottom);
  --safe-l:env(safe-area-inset-left); --safe-r:env(safe-area-inset-right);
}
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{height:100%}
body{
  background:var(--bg); color:var(--fg); overflow:hidden;
  font:16px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,sans-serif;
  -webkit-font-smoothing:antialiased;
}
code{background:var(--bg3);padding:1px 5px;border-radius:4px;font-size:.85em}
b{font-weight:600}

/* ── khung màn hình ── */
.view{position:fixed;inset:0;display:none;flex-direction:column;overflow:hidden}
.view.on{display:flex}
.pad{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;
     padding:16px calc(16px + var(--safe-r)) calc(28px + var(--safe-b)) calc(16px + var(--safe-l))}

/* ── thanh tiêu đề ── */
.bar{
  display:flex;align-items:center;gap:8px;flex:0 0 auto;
  padding:calc(10px + var(--safe-t)) calc(10px + var(--safe-r)) 10px calc(10px + var(--safe-l));
  border-bottom:1px solid var(--line);background:var(--bg2);
}
.bar h1{flex:1;font-size:17px;font-weight:600;text-align:center;
        white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.icon{
  width:38px;height:38px;flex:0 0 auto;border:0;border-radius:10px;
  background:transparent;color:var(--fg);font-size:20px;line-height:1;cursor:pointer;
}
.icon:active{background:var(--bg3)}
.bar .icon.back{font-size:28px}

/* ── nút ── */
button{font:inherit}
.primary,.ghost{
  display:block;width:100%;padding:13px;margin-top:14px;border:0;border-radius:12px;
  font-size:16px;font-weight:600;cursor:pointer;
}
.primary{background:var(--accent);color:#fff}
.ghost{background:var(--bg3);color:var(--fg)}
.primary:active,.ghost:active{opacity:.7}

/* ── thẻ nguồn ── */
.cards{display:flex;flex-direction:column;gap:10px}
.card{
  display:flex;align-items:center;gap:12px;padding:14px;
  background:var(--bg2);border:1px solid var(--line);border-radius:14px;cursor:pointer;
}
.card:active{background:var(--bg3)}
.card .txt{flex:1;min-width:0}
.card .nm{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.card .sb{font-size:13px;color:var(--dim);white-space:nowrap;overflow:hidden;
          text-overflow:ellipsis;margin-top:2px}
.card .del{
  flex:0 0 auto;width:34px;height:34px;border:0;border-radius:9px;
  background:transparent;color:var(--dim);font-size:17px;cursor:pointer;
}
.card .del:active{background:var(--bg3);color:var(--danger)}

/* ── danh sách tập ── */
.rows{list-style:none}
.rows li{
  display:flex;align-items:baseline;gap:12px;padding:14px 4px;
  border-bottom:1px solid var(--line);cursor:pointer;
}
.rows li:active{background:var(--bg2)}
.rows .nm{flex:1;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.rows .mt{font-size:13px;color:var(--dim);white-space:nowrap;
          font-variant-numeric:tabular-nums}
.rows .seen{color:var(--accent)}

.hint{color:var(--dim);font-size:14px;padding:10px 2px}
.hint.err{color:var(--danger)}

/* ── trình đọc ── */
.reader{background:#000}
#page{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;
      -webkit-user-select:none;user-select:none;-webkit-touch-callout:none}
.reader.fit-width{overflow-y:auto;-webkit-overflow-scrolling:touch}
.reader.fit-width #page{position:static;height:auto;object-fit:unset;display:block}

#bar-progress{position:fixed;top:0;left:0;height:3px;width:0;
              background:var(--accent);z-index:5;transition:width .2s}
#spin{
  position:absolute;top:50%;left:50%;width:30px;height:30px;margin:-15px 0 0 -15px;
  border:3px solid rgba(255,255,255,.22);border-top-color:#fff;border-radius:50%;
  animation:spin .8s linear infinite;opacity:0;transition:opacity .2s;z-index:4;
  pointer-events:none;
}
#spin.on{opacity:1}
@keyframes spin{to{transform:rotate(360deg)}}

.chrome{
  position:fixed;z-index:6;border:0;cursor:pointer;color:#fff;
  font:13px/1 -apple-system,system-ui,sans-serif;
  background:rgba(28,28,32,.72);
  -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
  border-radius:16px;padding:9px 14px;
  opacity:0;transition:opacity .3s;pointer-events:none;
}
.chrome.on{opacity:1;pointer-events:auto}
#r-back{top:calc(10px + var(--safe-t));left:calc(12px + var(--safe-l))}
#r-dir {top:calc(10px + var(--safe-t));right:calc(12px + var(--safe-r))}
#r-hud{
  left:50%;transform:translateX(-50%);bottom:calc(14px + var(--safe-b));
  display:flex;align-items:center;gap:12px;padding:10px 16px;
  width:min(460px,calc(100vw - 32px));
}
#r-count{font-variant-numeric:tabular-nums;white-space:nowrap;min-width:64px}
#r-slider{flex:1;accent-color:var(--accent);height:22px}

/* ── bảng trượt ── */
.sheet{
  position:fixed;inset:0;z-index:20;display:none;
  align-items:flex-end;justify-content:center;background:rgba(0,0,0,.55);
}
.sheet.on{display:flex}
.sheet-body{
  width:min(520px,100%);max-height:88vh;overflow-y:auto;background:var(--bg2);
  border-radius:20px 20px 0 0;border-top:1px solid var(--line);
  padding:20px calc(20px + var(--safe-r)) calc(20px + var(--safe-b)) calc(20px + var(--safe-l));
}
.sheet h2{font-size:19px;margin-bottom:16px}
.sheet label{display:block;font-size:13px;color:var(--dim);margin:14px 0 6px}
.sheet input,.sheet select{
  width:100%;padding:12px;border:1px solid var(--line);border-radius:10px;
  background:var(--bg);color:var(--fg);font:15px system-ui,sans-serif;
}
.sheet input:focus,.sheet select:focus{outline:2px solid var(--accent);outline-offset:-1px}
.note{font-size:12.5px;color:var(--dim);margin-top:8px;line-height:1.55}
.sheet-actions{display:flex;gap:10px;margin-top:8px}
.sheet-actions button{flex:1}

/* ── thông báo ── */
#toast{
  position:fixed;left:50%;bottom:calc(28px + var(--safe-b));transform:translateX(-50%);
  z-index:40;max-width:calc(100vw - 40px);padding:11px 18px;border-radius:12px;
  background:rgba(40,40,46,.95);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
  color:#fff;font-size:14px;text-align:center;
  opacity:0;pointer-events:none;transition:opacity .25s;
}
#toast.on{opacity:1}
#toast.err{background:rgba(140,40,36,.95)}