/* Flappy Audit · IVC
   Bố cục: một cột cỡ điện thoại trên nền giấy kẻ tím nhạt; bảng xếp hạng và trang quản trị mở rộng cho màn hình lớn tại quầy. */
:root{
  --violet:#6E57E0; --violet-2:#8B78EA; --violet-deep:#3D2C8D; --ink:#1F1838; --muted:#5F5980;
  --paper:#F3F1FA; --line:#E2DCF3; --card:#FFFFFF; --wash:#EEE9FB;
  --yellow:#FFC700; --orange:#F28D2B; --seal:#C9353B;
  --good:#167A51; --good-bg:#E1F4EA; --warn:#8A5300; --warn-bg:#FFF1D6; --danger:#B93434; --danger-bg:#FBE8E8;
  --f-display:"Bungee","Be Vietnam Pro",system-ui,sans-serif;
  --f-body:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --r:14px;
  color-scheme:light;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{height:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:400 15px/1.5 var(--f-body);-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent}
img{max-width:100%}
a{color:var(--violet);font-weight:600;text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:3px solid var(--yellow);outline-offset:2px}
h1,h2,h3{text-wrap:balance}

.app{max-width:460px;margin:0 auto;min-height:100%;display:flex;flex-direction:column;gap:14px;
  padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));
  padding-top:calc(12px + env(safe-area-inset-top,0px));padding-bottom:calc(20px + env(safe-area-inset-bottom,0px))}
.app.wide{max-width:1040px}

.top{display:flex;align-items:center;gap:10px}
.brand{display:flex;align-items:center;gap:10px;min-width:0;flex:1;color:inherit;font-weight:400}
.brand:hover{text-decoration:none}
.brand img{width:38px;height:38px;border-radius:10px;flex:none}
.brand-text{min-width:0}
.brand-text b{display:block;font-size:13px;letter-spacing:.08em;color:var(--violet-deep)}
.brand-text span{display:block;font-size:12px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.nav{display:flex;gap:6px;flex:none}
.nav a{font-size:12.5px;padding:6px 11px;border-radius:999px;background:var(--card);border:1px solid var(--line);color:var(--violet-deep);white-space:nowrap}
.nav a:hover{text-decoration:none;border-color:var(--violet-2)}
.nav a[aria-current="page"]{background:var(--violet);border-color:var(--violet);color:#fff}

.view{display:flex;flex-direction:column;gap:16px}
.eyebrow{font-size:11.5px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--violet);margin:0}

/* Màn hình bắt đầu */
.hero{display:grid;grid-template-columns:1fr auto;gap:2px 8px;align-items:center;padding-top:6px}
.hero .eyebrow{grid-column:1/-1}
.title{font-family:var(--f-display);font-weight:400;font-size:clamp(44px,14vw,62px);line-height:.9;margin:6px 0 0;color:var(--violet-deep)}
.title span{color:var(--violet)}
#heroBird{width:104px;height:124px;display:block}
.lede{grid-column:1/-1;margin:10px 0 14px;max-width:42ch}
.hero .btn{grid-column:1/-1}
.hero-staff{grid-column:1/-1;margin-top:10px;font-size:13.5px;display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.hero-staff .btn{grid-column:auto}
#staffBox{display:inline-flex;gap:12px;align-items:center;flex-wrap:wrap}
#staffBox[hidden]{display:none}
.test-bar{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin:0 0 12px;padding:8px 12px;border-radius:12px;
  background:var(--yellow);color:var(--ink);font-size:13.5px}
.test-bar[hidden]{display:none}

.btn{appearance:none;border:0;font:inherit;font-weight:700;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:46px;padding:0 18px;border-radius:12px;transition:transform .08s ease,filter .15s ease;text-align:center}
.btn:hover{filter:brightness(1.04);text-decoration:none}
.btn:active{transform:translateY(1px)}
.btn.primary{background:var(--violet);color:#fff}
.btn.cta{background:var(--yellow);color:var(--ink);box-shadow:0 3px 0 var(--orange)}
.btn.ghost{background:var(--card);color:var(--violet-deep);border:1.5px solid var(--line)}
.btn.danger{background:var(--danger-bg);color:var(--danger)}
.btn.big{min-height:54px;font-size:16px;width:100%}
.btn.sm{min-height:34px;padding:0 12px;font-size:13px;border-radius:9px}
.btn:disabled{opacity:.55;cursor:default;filter:none}
.btn-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.btn-row .btn{flex:1 1 140px}

.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px}
.panel > p{margin:0}
.resume{border:2px solid var(--violet);display:grid;gap:2px}
.h2{font-size:16px;margin:0;font-weight:800;color:var(--violet-deep)}
.sub{margin:2px 0 0;color:var(--muted);font-size:13.5px}
.row-between{display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap}
.mt{margin-top:10px!important}
.mt-xs{margin-top:6px!important}
.grow{flex:1}

.ladder{list-style:none;margin:14px 0 0;padding:0;display:grid;gap:10px;position:relative}
.ladder::before{content:"";position:absolute;left:31px;top:10px;bottom:10px;width:2px;background:var(--line)}
.rung{display:grid;grid-template-columns:64px minmax(0,1fr);gap:12px;align-items:center}
.pts{font-family:var(--f-display);font-size:15px;line-height:1.1;background:var(--wash);color:var(--violet-deep);border-radius:10px;text-align:center;padding:8px 4px;position:relative;z-index:1;font-variant-numeric:tabular-nums}
.pts small{display:block;font-family:var(--f-body);font-size:10px;font-weight:700;letter-spacing:.08em;color:var(--muted);margin-top:2px}
.rung:first-child .pts{background:var(--yellow);color:var(--ink)}
.rung:first-child .pts small{color:var(--ink)}
.rung b{display:block;font-size:15px}
.rung span{display:block;font-size:13px;color:var(--muted)}

.board{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.brow{display:grid;grid-template-columns:38px minmax(0,1fr) auto;gap:12px;align-items:center;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:10px 14px}
.rank{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;font-family:var(--f-display);font-size:14px;background:var(--wash);color:var(--violet-deep)}
.brow.r1 .rank{background:var(--yellow);color:var(--ink)}
.brow.r2 .rank{background:#D8D1EF}
.brow.r3 .rank{background:#F9C99D;color:var(--ink)}
.bname{min-width:0}
.bname b{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.bname span{display:block;font-size:12.5px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.bscore{font-family:var(--f-display);font-size:22px;color:var(--violet-deep);font-variant-numeric:tabular-nums}
.mini{margin-top:8px;gap:0}
.mini .brow{background:transparent;border:0;border-bottom:1px solid var(--line);border-radius:0;padding:8px 0}
.mini .brow:last-child{border-bottom:0}
.mini .rank{width:30px;height:30px;font-size:12px}
.mini .bscore{font-size:18px}
.empty{color:var(--muted);font-size:13.5px;margin:10px 0 0;list-style:none}

/* Form */
.h-view{font-size:22px;margin:0;font-weight:800;color:var(--violet-deep)}
.form{display:grid;gap:14px}
.field{display:grid;gap:6px;min-width:0}
.field > label,.legend{font-size:13px;font-weight:700;color:var(--violet-deep)}
.req{color:var(--danger)}
.input{font:inherit;font-size:16px;min-height:48px;padding:10px 12px;border-radius:10px;border:1.5px solid var(--line);background:var(--card);color:var(--ink);width:100%}
.input::placeholder{color:#A49EBE}
.input:focus{outline:none;border-color:var(--violet);box-shadow:0 0 0 3px rgba(110,87,224,.18)}
.input[aria-invalid="true"]{border-color:var(--danger)}
.input.compact{min-height:36px;font-size:14px}
.two{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media (max-width:390px){.two{grid-template-columns:1fr}}
fieldset{border:0;margin:0;padding:0;min-width:0}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:6px}
.chip-check{position:relative;display:inline-flex}
.chip-check input{position:absolute;opacity:0;inset:0;margin:0;cursor:pointer}
.chip-check span{display:inline-flex;min-height:40px;align-items:center;padding:0 14px;border-radius:999px;border:1.5px solid var(--line);background:var(--card);font-weight:600;font-size:14px}
.chip-check input:checked + span{background:var(--violet);border-color:var(--violet);color:#fff}
.chip-check input:focus-visible + span{outline:3px solid var(--yellow);outline-offset:2px}
.consent{display:grid;grid-template-columns:22px 1fr;gap:10px;font-size:13.5px;align-items:start;background:var(--wash);border-radius:10px;padding:12px}
.consent input{width:20px;height:20px;margin:1px 0 0;accent-color:var(--violet)}
.form-error{background:var(--danger-bg);color:var(--danger);padding:10px 12px;border-radius:10px;font-size:13.5px;margin:0}
.back{align-self:flex-start;background:none;border:0;font:inherit;color:var(--violet);font-weight:700;padding:4px 0;cursor:pointer}

/* Game */
.game-view{gap:10px}
.hud{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,.8fr) minmax(0,.8fr);gap:8px}
.hud > div{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:5px 10px;min-width:0}
.hud-label{display:block;font-size:10px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:700}
.hud b{display:block;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-variant-numeric:tabular-nums}
.stage{position:relative;margin:0 auto;border-radius:16px;overflow:hidden;box-shadow:0 0 0 2px var(--violet-deep),0 10px 30px rgba(61,44,141,.18);touch-action:none;user-select:none;-webkit-user-select:none;max-width:100%;background:var(--paper)}
.stage canvas{display:block;width:100%;height:100%}
.overlay{position:absolute;inset:0;display:grid;place-items:center;padding:14px}
.overlay.passive{pointer-events:none;place-items:end center;padding-bottom:26%}
.ov-card{background:rgba(255,255,255,.97);border-radius:16px;padding:18px;width:min(100%,300px);text-align:center;box-shadow:0 8px 30px rgba(31,24,56,.25);display:grid;gap:8px}
.ov-card p{margin:0}
.ov-title{font-weight:800;font-size:17px;color:var(--violet-deep)}
.ov-hint{font-size:12.5px;color:var(--muted)}
.big-score{font-family:var(--f-display);font-size:60px;line-height:1;color:var(--violet-deep);font-variant-numeric:tabular-nums}
.next-tier{font-size:13px;background:var(--wash);border-radius:9px;padding:7px 10px;color:var(--violet-deep);font-weight:600}
.ov-actions{display:grid;gap:8px;margin-top:4px}

/* Phần thưởng */
.prize-head{display:grid;gap:4px}
.prize-head p{margin:0}
.folder{position:relative;width:100%;aspect-ratio:5/4;max-width:100%;perspective:1100px;margin-top:4px}
.f-back{position:absolute;inset:20px 0 0;background:var(--violet-deep);border-radius:12px}
.f-tab{position:absolute;left:18px;top:0;width:48%;height:30px;background:var(--violet-deep);border-radius:10px 10px 0 0;color:#fff;font-size:10.5px;font-weight:700;letter-spacing:.12em;padding:7px 12px;text-transform:uppercase;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.paper{position:absolute;left:14px;right:14px;top:34px;bottom:12px;background:#fff;border-radius:8px;padding:16px;display:flex;flex-direction:column;gap:4px;overflow:hidden;
  background-image:repeating-linear-gradient(to bottom,transparent 0 23px,#F0ECFA 23px 24px)}
.docno{font-size:11px;color:var(--muted);letter-spacing:.04em;font-variant-numeric:tabular-nums}
.doctitle{font-weight:800;font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--violet-deep)}
.prize-name{font-family:var(--f-display);font-size:clamp(22px,7.2vw,30px);line-height:1.12;color:var(--ink);margin-top:10px;max-width:11em}
.prize-meta{font-size:13px;color:var(--muted);max-width:55%;margin-top:4px}
.stamp{position:absolute;right:14px;bottom:14px;width:100px;height:100px;border-radius:50%;border:3px solid var(--seal);color:var(--seal);display:grid;place-items:center;text-align:center;font-weight:800;font-size:11px;letter-spacing:.06em;line-height:1.25;transform:rotate(-14deg);opacity:.9}
.stamp::before{content:"";position:absolute;inset:5px;border:1.5px solid var(--seal);border-radius:50%}
.stamp b{display:block;font-size:15px;letter-spacing:.04em}
.f-front{position:absolute;left:0;right:0;bottom:0;top:44%;background:var(--violet);border-radius:12px;transform-origin:50% 100%;transition:transform .8s cubic-bezier(.3,.7,.2,1);display:flex;align-items:center;justify-content:center;flex-direction:column;color:#fff;gap:2px;padding:12px;text-align:center;backface-visibility:hidden;box-shadow:0 -2px 0 rgba(255,255,255,.18) inset}
.f-front b{font-size:18px}
.f-front span{font-size:13px;opacity:.88}
.folder.open .f-front{transform:rotateX(-94deg)}
.folder:not(.open) .reveal{visibility:hidden}
.folder:not(.open) .stamp{opacity:0}
.folder.open .stamp{animation:stamp .38s cubic-bezier(.2,1.5,.4,1) .7s both}
@keyframes stamp{from{opacity:0;transform:rotate(-14deg) scale(2.3)}to{opacity:.9;transform:rotate(-14deg) scale(1)}}
.codebox{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px;align-items:center;background:var(--card);border:2px dashed var(--violet);border-radius:14px;padding:12px 14px}
.codebox small{display:block;font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:700}
.codebox output{display:block;font-family:var(--f-display);font-size:28px;color:var(--violet-deep);letter-spacing:.04em;user-select:all;-webkit-user-select:all}
.note{font-size:13.5px;color:var(--muted);margin:0}
.notice{background:var(--warn-bg);color:var(--warn);border-radius:10px;padding:10px 12px;font-size:13.5px;margin:0}

/* Bảng xếp hạng */
.board-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;flex-wrap:wrap}
.title-sm{font-family:var(--f-display);font-weight:400;font-size:clamp(28px,6vw,46px);line-height:1;margin:6px 0 0;color:var(--violet-deep)}
.count-pill{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:8px 14px;font-size:13px;color:var(--muted)}
.count-pill b{font-family:var(--f-display);font-size:22px;color:var(--violet-deep);margin-right:6px;font-weight:400}
.app.wide .board .brow{padding:12px 18px}
.app.wide .board .bscore{font-size:28px}
.app.wide .board .bname b{font-size:17px}
@media (min-width:900px){.app.wide .board.full{grid-template-columns:1fr 1fr;grid-auto-flow:column;grid-template-rows:repeat(10,auto);column-gap:14px}}

/* Quản trị */
.login{display:grid;gap:10px;max-width:420px}
.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}
@media (max-width:560px){.stats{grid-template-columns:repeat(2,minmax(0,1fr))}}
.stat{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:10px 12px}
.stat b{display:block;font-family:var(--f-display);font-weight:400;font-size:24px;color:var(--violet-deep);font-variant-numeric:tabular-nums}
.stat span{font-size:12px;color:var(--muted)}
.tbl-wrap{overflow-x:auto;margin-top:12px;border:1px solid var(--line);border-radius:10px}
table{border-collapse:collapse;width:100%;font-size:13px;font-variant-numeric:tabular-nums}
th,td{padding:7px 8px;border-bottom:1px solid var(--line);text-align:left;white-space:nowrap;vertical-align:middle}
tr:last-child td{border-bottom:0}
th{font-size:10.5px;letter-spacing:.07em;text-transform:uppercase;color:var(--muted);background:var(--wash);font-weight:700}
td .input{min-height:36px;font-size:14px;padding:5px 8px}
.input.num{width:66px;text-align:right}
.input.name{min-width:180px}
.r{text-align:right}
.tiers-edit{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:8px;margin-top:10px}
.tier-box{background:var(--wash);border-radius:10px;padding:8px;display:grid;gap:6px}
.tier-box label{font-size:11px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.tier-box .input{min-height:38px;font-size:14px}
.toolbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:12px}
.chip{display:inline-flex;align-items:center;font-size:11.5px;font-weight:700;padding:2px 8px;border-radius:999px;white-space:nowrap}
.chip.warn{background:var(--warn-bg);color:var(--warn)}
.chip.ok{background:var(--good-bg);color:var(--good)}
.chip.muted{background:var(--wash);color:var(--muted)}
.plist{list-style:none;margin:10px 0 0;padding:0;display:grid}
.prow{display:grid;grid-template-columns:minmax(0,1.4fr) 64px minmax(0,1.4fr) auto;gap:10px;align-items:center;padding:10px 0;border-bottom:1px solid var(--line)}
.prow:last-child{border-bottom:0}
.prow .who{min-width:0}
.prow b{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.prow .small{display:block;font-size:12.5px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.pscore{font-family:var(--f-display);font-size:18px;color:var(--violet-deep);text-align:right;line-height:1.1}
.pscore small{display:block;font-family:var(--f-body);font-size:11px;color:var(--muted)}
.pprize{min-width:0;display:flex;flex-wrap:wrap;gap:4px 8px;align-items:center;font-size:13.5px}
.pprize code{font-family:var(--f-display);font-size:13px;color:var(--violet-deep)}
@media (max-width:640px){.prow{grid-template-columns:minmax(0,1fr) auto}.prow .pprize,.prow .pact{grid-column:1/-1}}

.foot{margin-top:auto;padding-top:18px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:12px;color:var(--muted)}
.foot a{font-weight:500;color:var(--muted)}

.toast{position:fixed;left:50%;bottom:calc(18px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);background:var(--ink);color:#fff;padding:10px 14px;border-radius:10px;font-size:13.5px;width:max-content;max-width:calc(100% - 32px);z-index:50;box-shadow:0 8px 24px rgba(31,24,56,.3)}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important}
  .folder.open .stamp{opacity:.9}
}

/* Câu hỏi trước khi chơi */
.qz-dots{list-style:none;margin:0;padding:0;display:flex;gap:6px}
.qz-dots li{flex:1;height:6px;border-radius:999px;background:var(--line)}
.qz-dots li.cur{background:var(--violet-2)}
.qz-dots li.right{background:var(--good)}
.qz-dots li.wrong{background:var(--orange)}
.qz-text{font-size:17px;font-weight:700;line-height:1.45;margin:10px 0 14px;color:var(--ink)}
.qz-opts{display:grid;gap:8px}
.qz-opt{appearance:none;font:inherit;text-align:left;cursor:pointer;display:grid;grid-template-columns:30px 1fr;gap:10px;align-items:center;
  min-height:50px;padding:8px 12px;border-radius:12px;border:1.5px solid var(--line);background:var(--card);color:var(--ink)}
.qz-opt b{display:grid;place-items:center;width:30px;height:30px;border-radius:8px;background:var(--wash);color:var(--violet-deep);font-size:14px}
.qz-opt:hover:not(:disabled){border-color:var(--violet-2)}
.qz-opt:disabled{cursor:default}
.qz-opt.right{border-color:var(--good);background:var(--good-bg)}
.qz-opt.right b{background:var(--good);color:#fff}
.qz-opt.wrong{border-color:var(--danger);background:var(--danger-bg)}
.qz-opt.wrong b{background:var(--danger);color:#fff}
.qz-result{margin-top:12px;border-radius:10px;padding:10px 12px;font-size:14px}
.qz-result.right{background:var(--good-bg);color:var(--good)}
.qz-result.wrong{background:var(--warn-bg);color:var(--warn)}
.qz-result p{margin:4px 0 0;color:var(--ink)}
.qz-done{text-align:center;display:grid;gap:6px;justify-items:center}

/* Hỏi đáp */
.faq-list{display:grid;gap:14px}
.faq-group{display:grid;gap:8px}
.faq-group h3{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--violet);margin:0}
.faq{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:0 14px}
.faq summary{cursor:pointer;font-weight:700;padding:13px 0;list-style-position:outside;margin-left:16px}
.faq[open] summary{color:var(--violet-deep)}
.faq p{margin:0 0 14px;white-space:pre-line;color:var(--ink)}

/* Quản trị: tài khoản và câu hỏi */
.admin-me{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.qlist summary{cursor:pointer;font-weight:700;color:var(--violet-deep)}
.qlist ol{margin:10px 0 0;padding-left:22px;display:grid;gap:10px;font-size:13.5px}
.qlist .opt-ok{color:var(--good);font-weight:700}
.qlist small{color:var(--muted)}
#qErrors ul{margin:6px 0 0;padding-left:18px}