:root{
  --bg:#0d0f14;--surface:#161920;--surface2:#1e2230;--border:#2a2f40;
  --accent:#4f8ef7;--accent2:#f7c94f;--accent3:#4ff7a8;--danger:#f7604f;
  --text:#e8eaf0;--text2:#8890a8;--text3:#555e78;--radius:12px;
  --hh:56px;--nh:60px;
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
html{scroll-padding-top:calc(var(--hh)+20px)}
body{font-family:'Be Vietnam Pro',sans-serif;background:var(--bg);color:var(--text);min-height:100vh}

/* LOADER */
#loader{position:fixed;inset:0;background:var(--bg);display:flex;flex-direction:column;align-items:center;justify-content:center;z-index:999;gap:16px}
.spin{width:36px;height:36px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.loader-text{font-size:13px;color:var(--text2)}

/* HEADER */
header{background:var(--surface);border-bottom:1px solid var(--border);height:var(--hh);display:flex;align-items:center;justify-content:space-between;padding:0 16px;position:fixed;top:0;left:0;right:0;z-index:100}
.logo{font-size:14px;font-weight:800;display:flex;align-items:center;gap:8px;white-space:nowrap}
.logo-dot{width:8px;height:8px;background:var(--accent);border-radius:50%;box-shadow:0 0 8px var(--accent);flex-shrink:0}
.user-chip{display:flex;align-items:center;gap:7px;background:var(--surface2);border:1px solid var(--border);padding:5px 10px;border-radius:8px;font-size:11px;max-width:150px;overflow:hidden;cursor:pointer}
.user-avatar{width:22px;height:22px;border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:9px;font-weight:800;background:rgba(79,142,247,.2);color:var(--accent);flex-shrink:0}
.user-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* DESKTOP NAV */
.dnav{display:flex;gap:3px}
.dnav button{background:none;border:1px solid transparent;color:var(--text2);padding:6px 12px;border-radius:8px;font-family:inherit;font-size:12px;font-weight:500;cursor:pointer;transition:all .2s}
.dnav button:hover{color:var(--text);background:var(--surface2)}
.dnav button.active{color:var(--accent);background:rgba(79,142,247,.1);border-color:rgba(79,142,247,.3)}

/* BOTTOM NAV */
.bnav{display:none;position:fixed;bottom:0;left:0;right:0;background:var(--surface);border-top:1px solid var(--border);height:var(--nh);z-index:100;padding-bottom:env(safe-area-inset-bottom,0px)}
.bnav-btn{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;background:none;border:none;color:var(--text3);font-family:inherit;font-size:10px;font-weight:600;cursor:pointer;transition:color .2s;padding:0;height:100%}
.bnav-btn .bicon{font-size:20px;line-height:1}
.bnav-btn.active{color:var(--accent)}

/* MAIN */
main{padding-top:4.5rem;padding-bottom:1rem;padding-left:16px;padding-right:16px;max-width:1400px;margin:0 auto}
.view{display:none}.view.active{display:block}
.ptitle{font-size:20px;font-weight:800;letter-spacing:-.5px;margin-bottom:14px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.ptitle span{font-size:11px;font-weight:500;color:var(--text2);background:var(--surface2);border:1px solid var(--border);padding:3px 10px;border-radius:20px}

/* BUTTONS */
.bico{background:var(--surface2);border:1px solid var(--border);color:var(--text);width:32px;height:32px;border-radius:8px;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0}
.bsm{background:var(--surface2);border:1px solid var(--border);color:var(--text2);padding:7px 14px;border-radius:8px;font-family:inherit;font-size:12px;font-weight:600;cursor:pointer;white-space:nowrap}
.bpri{background:var(--accent);color:#fff;border:none;padding:12px;border-radius:10px;font-family:inherit;font-size:13px;font-weight:700;cursor:pointer;width:100%}
.bpri:disabled{opacity:.5;cursor:not-allowed}
.bdng{background:rgba(247,96,79,.1);color:var(--danger);border:1px solid rgba(247,96,79,.3);padding:8px 14px;border-radius:8px;font-family:inherit;font-size:12px;font-weight:600;cursor:pointer}
.bsml{background:rgba(79,142,247,.15);color:var(--accent);border:1px solid rgba(79,142,247,.3);padding:4px 10px;border-radius:6px;font-family:inherit;font-size:11px;font-weight:700;cursor:pointer}
.mclose{background:var(--surface2);border:1px solid var(--border);color:var(--text2);width:28px;height:28px;border-radius:6px;cursor:pointer;font-size:14px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.btn-success{background:rgba(79,247,168,.15);color:var(--accent3);border:1px solid rgba(79,247,168,.3);padding:7px 14px;border-radius:8px;font-family:inherit;font-size:12px;font-weight:700;cursor:pointer;transition:all .2s}
.btn-success:hover{background:rgba(79,247,168,.25)}
.btn-danger{background:rgba(247,96,79,.1);color:var(--danger);border:1px solid rgba(247,96,79,.3);padding:7px 14px;border-radius:8px;font-family:inherit;font-size:12px;font-weight:700;cursor:pointer;transition:all .2s}
.btn-danger:hover{background:rgba(247,96,79,.2)}
.btn-sm{padding:5px 10px;font-size:11px;border-radius:7px}

/* AVATAR — dùng chung (empAvatar() trong app.js) */
.avatar{width:24px;height:24px;border-radius:7px;display:flex;align-items:center;justify-content:center;font-size:10px;font-weight:800;flex-shrink:0}

/* FORM GROUP — dùng chung (login + task form) */
.fg label{display:block;font-size:10px;font-weight:700;color:var(--text2);text-transform:uppercase;letter-spacing:.5px;margin-bottom:5px}
.fg input,.fg select,.fg textarea{width:100%;background:var(--surface2);border:1px solid var(--border);color:var(--text);padding:9px 12px;border-radius:8px;font-family:inherit;font-size:13px;outline:none;-webkit-appearance:none}
.fg input:focus,.fg select:focus,.fg textarea:focus{border-color:var(--accent)}
.fg textarea{resize:vertical;min-height:60px}
.fg select option{background:var(--surface2)}
.frow{display:grid;grid-template-columns:1fr 1fr;gap:8px}

/* BOTTOM SHEET */
.soverlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.6);z-index:300;backdrop-filter:blur(3px)}
.soverlay.open{display:block}
.bsheet{position:fixed;bottom:0;left:0;right:0;background:var(--surface);border-radius:20px 20px 0 0;border-top:1px solid var(--border);z-index:301;max-height:90vh;overflow-y:auto;transform:translateY(100%);transition:transform .3s cubic-bezier(.4,0,.2,1)}
.bsheet.open{transform:translateY(0)}
.shandle{width:40px;height:4px;background:var(--border);border-radius:2px;margin:12px auto 0}
.shead{padding:14px 18px 10px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border)}
.stitle{font-size:15px;font-weight:800}
.sbody{padding:16px 18px;display:flex;flex-direction:column;gap:12px;padding-bottom:calc(env(safe-area-inset-bottom)+24px)}


/* MODAL */
.movl{display:none;position:fixed;inset:0;background:rgba(0,0,0,.65);backdrop-filter:blur(4px);z-index:200;align-items:center;justify-content:center;padding:16px}
.movl.open{display:flex}
.modal{background:var(--surface);border:1px solid var(--border);border-radius:16px;width:100%;max-width:400px;max-height:90vh;overflow-y:auto;animation:slideUp .2s ease}
@keyframes slideUp{from{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}
.mhead{padding:16px 18px 12px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}
.mtitle{font-size:14px;font-weight:800}
.mbody{padding:16px;display:flex;flex-direction:column;gap:12px}

/* TOAST */
.toast{position:fixed;bottom:80px;left:50%;transform:translateX(-50%);background:var(--surface2);border:1px solid var(--border);color:var(--text);padding:10px 20px;border-radius:10px;font-size:13px;font-weight:600;z-index:999;white-space:nowrap;display:none;animation:fadeUp .3s ease}
.toast.s{border-color:var(--accent3)}.toast.e{border-color:var(--danger)}
@keyframes fadeUp{from{transform:translate(-50%,8px);opacity:0}to{transform:translate(-50%,0);opacity:1}}



.empty{text-align:center;padding:32px 20px;color:var(--text3)}
.empty .eico{font-size:32px;margin-bottom:10px}
.empty p{font-size:12px}
.nodeny{text-align:center;padding:80px 20px;color:var(--text2)}
.nodeny h2{font-size:20px;margin-bottom:10px;color:var(--text)}
.nodeny p{font-size:13px;line-height:1.8}


/* RESPONSIVE */
@media(max-width:768px){
  :root{--hh:48px;--nh:56px}
  .bnav{display:flex}
  .dnav{display:none}
  main{padding-top:4rem;padding-bottom:4.5rem;padding-left:12px;padding-right:12px}
  .toast{bottom:4.125rem}
  .avatar{width:18px;height:18px;font-size:7px;border-radius:5px}
}
@media(min-width:769px){
  .bsheet{border-radius:16px;top:50%;left:50%;bottom:auto;right:auto;width:440px;max-width:90vw;transform:translate(-50%,-60%);transition:transform .25s ease,opacity .25s ease;opacity:0;pointer-events:none}
  .bsheet.open{transform:translate(-50%,-50%);opacity:1;pointer-events:all}
  .shandle{display:none}
}