/* Khung CSS dùng chung bản 6-8. Mỗi bản đặt biến ở :root trong style.css riêng. Không chuyển màu. */
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:400 16px/1.6 var(--body);overflow-x:hidden;min-height:100vh}
button,input{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--focus,var(--accent));outline-offset:3px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
svg{display:block;width:100%;height:auto}
#app{position:relative;overflow-x:clip}

.top{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:16px clamp(16px,4vw,48px);position:relative;z-index:3}
.logo{font:var(--logo-weight,700) clamp(22px,3vw,30px)/1 var(--display);color:var(--logo,var(--accent));text-decoration:none}
.tag{font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}

.page{max-width:1180px;margin:0 auto;padding:8px clamp(16px,4vw,48px) 48px;position:relative;z-index:2}
.headline{font:var(--h-weight,700) clamp(34px,6vw,68px)/1.08 var(--display);margin:0 0 16px;letter-spacing:var(--h-track,0)}
.hl{color:var(--accent)}
.bubble{background:var(--paper);color:var(--paper-ink,var(--ink));border:var(--bw,3px) solid var(--line);border-radius:var(--r-bubble,22px);padding:14px 18px;margin:0;max-width:440px;box-shadow:var(--shadow);font-weight:600}

/* trang chính */
.hero{display:grid;grid-template-columns:1.1fr .9fr;align-items:center;gap:24px;min-height:min(62vh,560px)}
.hero-art{position:relative;aspect-ratio:1;max-width:460px;width:100%;justify-self:center}
.hero-art .deco{position:absolute;inset:0}
.hero-bird{position:absolute;left:12%;top:18%;width:76%}
.idle svg{animation:bob 3.2s ease-in-out infinite}
@keyframes bob{50%{transform:translateY(-8px)}}
.cols{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:24px}
.donation,.leaderboard,.pay-card,.gift{background:var(--paper);color:var(--paper-ink,var(--ink));border:var(--bw,3px) solid var(--line);border-radius:var(--r,20px);padding:clamp(18px,3vw,30px);box-shadow:var(--shadow)}
.form-title,.board-title{font:700 24px/1.2 var(--display);margin:0 0 14px}
.amounts{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.amount{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;min-height:92px;padding:8px;border:var(--bw,3px) solid var(--line);border-radius:var(--r-small,14px);background:var(--chip,transparent);cursor:pointer;font-weight:700;transition:transform .15s}
.amount:hover{transform:translateY(-2px)}
.amount[aria-pressed=true]{background:var(--gold);color:var(--on-gold,var(--ink));transform:translateY(-3px)}
.amount-custom{min-height:auto;grid-column:1/-1;min-height:48px}
.fruit{width:42px}
.fruit-label{font-size:15px}
.custom-wrap{margin-top:12px;display:grid;gap:6px}
.alias{display:block;margin-top:14px;font-weight:600}
input[type=number],#nickname{width:100%;padding:12px 14px;border:2px solid var(--line);border-radius:var(--r-small,12px);background:var(--field,#fff);color:var(--field-ink,#222);margin-top:6px}
.anon{display:flex;gap:8px;align-items:center;margin-top:10px}
.anon input{width:20px;height:20px;accent-color:var(--accent)}
.primary{display:block;width:100%;margin-top:16px;padding:15px 20px;border:var(--bw,3px) solid var(--line);border-radius:var(--r-btn,999px);background:var(--accent);color:var(--on-accent,#fff);font:700 18px/1.2 var(--display);cursor:pointer;box-shadow:var(--btn-shadow,none);transition:transform .15s}
.primary:hover{transform:translateY(-2px)}
.primary:active{transform:translateY(1px)}
.secondary{padding:10px 16px;border:2px solid var(--line);border-radius:var(--r-btn,999px);background:transparent;cursor:pointer;font-weight:600}
.text-button,.link{background:none;border:0;padding:10px 4px;cursor:pointer;text-decoration:underline;text-underline-offset:3px}
.fine{font-size:14px;color:var(--muted-paper,var(--muted));margin:10px 0 0}
.tabs{display:flex;gap:6px;margin-bottom:12px;flex-wrap:wrap}
.tab{padding:8px 14px;border:2px solid var(--line);border-radius:var(--r-btn,999px);background:transparent;cursor:pointer;font-weight:600;white-space:nowrap}
.tab[aria-selected=true]{background:var(--ink-tab,var(--line));color:var(--on-tab,var(--paper))}
.rank-list{list-style:none;margin:0;padding:0}
.rank{display:grid;grid-template-columns:40px 1fr auto;gap:12px;align-items:center;padding:10px 0;border-bottom:2px dashed var(--rule,rgba(0,0,0,.15))}
.position{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;border:2px solid var(--line);font-weight:800}
.medal .position{background:var(--gold);color:var(--on-gold,var(--ink))}
.who{display:flex;flex-direction:column;min-width:0}
.rank-title{font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--accent);font-weight:700}
.rank-name{font-weight:700;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.total{font-weight:800;font-variant-numeric:tabular-nums}
.more{margin-top:10px}
.more{padding:8px 14px;border:2px solid var(--line);border-radius:var(--r-btn,999px);background:transparent;cursor:pointer;font-weight:600}

/* mở đầu: chim bay tới giữa màn hình */
.intro{min-height:100vh;min-height:100svh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:18px;text-align:center;padding-top:24px;cursor:pointer;overflow:hidden;max-width:none}
.intro>.deco{position:absolute;inset:0;z-index:0;pointer-events:none}
.intro>.deco svg{width:100%;height:100%}
.intro-stage{position:relative;width:min(58vw,340px);aspect-ratio:420/336;z-index:2}
.flier{position:absolute;inset:0}
.flier.flying{animation:fly-in 2.2s cubic-bezier(.2,.7,.25,1) both}
.flier.flying svg{animation:flap-body .32s ease-in-out infinite}
.flier.landed{animation:land .6s ease-out both}
.flier.instant{animation:none}
@keyframes fly-in{0%{transform:translate(-75vw,-38vh) rotate(-14deg) scale(.45)}55%{transform:translate(-12vw,-6vh) rotate(-6deg) scale(.85)}80%{transform:translate(3vw,-2vh) rotate(4deg) scale(1.04)}100%{transform:none}}
@keyframes flap-body{50%{transform:translateY(-6px)}}
@keyframes land{0%{transform:scale(1.05,.92)}50%{transform:scale(.96,1.05)}100%{transform:none}}
.trail{position:absolute;left:-60%;top:40%;width:80%;height:6px;border-radius:6px;background:var(--trail,var(--gold));transform-origin:right center;opacity:0;z-index:-1}
.flier.flying~.trail,.intro-stage:has(.flying) .trail{animation:trail 2.2s ease-out both}
@keyframes trail{0%{opacity:0;transform:scaleX(.2)}40%{opacity:.9}100%{opacity:0;transform:scaleX(1)}}
.intro-say{min-height:3.4em;max-width:min(92vw,520px);z-index:2;font-size:clamp(18px,2.4vw,22px)}
.intro-say:empty{visibility:hidden}
.go{width:auto;min-width:240px;z-index:2}
.go.ready{opacity:1;animation:pop .5s ease-out}
@keyframes pop{50%{transform:scale(1.06)}}
/* cánh vỗ (nhóm .wing trong SVG chim) */
.flying .wing{animation:flap .32s ease-in-out infinite;transform-box:fill-box;transform-origin:30% 70%}
@keyframes flap{50%{transform:rotate(-28deg) scaleY(.7)}}

/* thanh toán */
.pay{display:grid;grid-template-columns:.8fr 1.2fr;gap:28px;align-items:start}
.pay-side{display:grid;gap:14px;justify-items:center;position:sticky;top:16px}
.pay-bird{width:min(100%,300px)}
.pay-card .headline{font-size:clamp(30px,4vw,44px)}
.demo{display:inline-block;font-size:13px;padding:4px 10px;border:2px dashed var(--line);border-radius:8px;margin:0 0 12px}
.qr{width:min(100%,240px);border:var(--bw,3px) solid var(--line);border-radius:12px;overflow:hidden;background:#fff}
.pay-info{display:flex;flex-wrap:wrap;gap:18px;align-items:center;margin-top:14px}
.pay-amount{font:800 clamp(28px,4vw,40px)/1 var(--display);margin:0;font-variant-numeric:tabular-nums}
.clock{display:grid;gap:4px;min-width:180px;flex:1}
.clock-label{font-size:13px;color:var(--muted-paper,var(--muted))}
.time{font:800 26px/1 var(--display);font-variant-numeric:tabular-nums}
.bar{height:10px;border:2px solid var(--line);border-radius:10px;overflow:hidden}
.bar-fill{display:block;height:100%;background:var(--accent);transform-origin:left;transition:transform 1s linear}
.order-code{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-top:6px}
.order-code code{font:700 20px/1 ui-monospace,Consolas,monospace;letter-spacing:.1em;padding:10px 12px;border:2px solid var(--line);border-radius:10px;background:var(--field,#fff);color:var(--field-ink,#222)}

/* mở túi */
.opening{min-height:100vh;min-height:100svh;display:grid;place-items:center;align-content:center;gap:20px;overflow:hidden;max-width:none}
.opening>.deco{position:absolute;inset:0;z-index:0;pointer-events:none}
.opening>.deco svg{width:100%;height:100%}
.o-scene{position:relative;width:min(88vw,460px);aspect-ratio:1;z-index:2}
.o-bird{position:absolute;width:48%;left:26%;top:-4%;opacity:0}
.o-bag{position:absolute;width:56%;left:22%;bottom:4%;opacity:0;transform-origin:50% 100%}
.o-gold{position:absolute;width:44%;left:28%;top:34%;opacity:0}
.o-burst{position:absolute;left:50%;top:52%;width:0;height:0}
.bit{position:absolute;width:14px;height:14px;margin:-7px;background:var(--gold);border:2px solid var(--line);border-radius:var(--bit-r,3px);opacity:0;transform:rotate(var(--a)) translateY(0)}
.o-card{position:absolute;left:50%;bottom:-2%;transform:translate(-50%,20px);opacity:0;white-space:nowrap;font:700 clamp(18px,3vw,24px)/1.2 var(--display);background:var(--paper);color:var(--paper-ink,var(--ink));border:var(--bw,3px) solid var(--line);border-radius:var(--r-small,14px);padding:10px 18px;box-shadow:var(--shadow)}
.caption{font:700 clamp(20px,3vw,28px)/1.3 var(--display);text-align:center;z-index:2;margin:0;min-height:1.4em}
/* nhịp 1: chim xách túi tới, thả túi */
[data-phase="1"] .o-bird,[data-phase="2"] .o-bird,[data-phase="3"] .o-bird,[data-phase="4"] .o-bird{animation:courier 1.6s ease-out both}
@keyframes courier{0%{opacity:1;transform:translate(-80vw,-10vh) scale(.6)}60%{opacity:1;transform:none}100%{opacity:0;transform:translate(70vw,-30vh) scale(.6)}}
[data-phase] .o-bag{transition:none}
[data-phase="1"] .o-bag{animation:drop .9s .5s cubic-bezier(.3,1.5,.5,1) both}
@keyframes drop{0%{opacity:0;transform:translateY(-60%) scale(.7)}100%{opacity:1;transform:none}}
/* nhịp 2: túi rung */
[data-phase="2"] .o-bag{opacity:1;animation:shake .5s ease-in-out 2}
@keyframes shake{25%{transform:rotate(-6deg) scale(1.03,.97)}75%{transform:rotate(6deg) scale(.97,1.03)}}
/* nhịp 3: dây bung, miệng túi mở; nhịp 4: vàng bay lên, mảnh vàng toả */
[data-phase="3"] .o-bag,[data-phase="4"] .o-bag{opacity:1}
.o-bag .tie,.o-bag .flap-l,.o-bag .flap-r{transform-box:fill-box;transition:transform .6s cubic-bezier(.3,1.4,.5,1),opacity .4s}
.o-bag .flap-l{transform-origin:100% 100%}
.o-bag .flap-r{transform-origin:0% 100%}
[data-phase="3"] .o-bag .tie,[data-phase="4"] .o-bag .tie{transform:translateY(-60px) rotate(40deg);opacity:0}
[data-phase="3"] .o-bag .flap-l,[data-phase="4"] .o-bag .flap-l{transform:rotate(-38deg)}
[data-phase="3"] .o-bag .flap-r,[data-phase="4"] .o-bag .flap-r{transform:rotate(38deg)}
[data-phase="4"] .o-gold{animation:rise 1.2s cubic-bezier(.2,1.3,.4,1) both}
@keyframes rise{0%{opacity:0;transform:translateY(50%) scale(.4)}100%{opacity:1;transform:translateY(-28%) scale(1)}}
[data-phase="4"] .o-gold svg{animation:glint 1.4s 1.2s ease-in-out infinite}
@keyframes glint{50%{transform:rotate(-4deg) scale(1.04)}}
[data-phase="4"] .bit{animation:burst 1.1s ease-out both}
@keyframes burst{0%{opacity:1;transform:rotate(var(--a)) translateY(0) scale(.4)}100%{opacity:0;transform:rotate(var(--a)) translateY(calc(var(--d) * -1.6)) scale(1)}}
[data-phase="4"] .o-card{animation:card .6s 1s ease-out both}
@keyframes card{to{opacity:1;transform:translate(-50%,0)}}

/* kết quả */
.result{display:grid;grid-template-columns:.85fr 1.15fr;gap:32px;align-items:center}
.res-art{position:relative;aspect-ratio:1;max-width:440px;width:100%;justify-self:center}
.res-art .deco{position:absolute;inset:0}
.res-gold{position:absolute;width:56%;left:22%;top:48%}
.res-bird{position:absolute;width:62%;left:19%;top:4%}
.kicker{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);font-weight:700;margin:0 0 6px}
.gift .headline{font-size:clamp(30px,4.4vw,50px)}
.gift-line{margin:0 0 8px;font-size:18px}
.source{display:inline-block;margin-top:8px;color:inherit}
.share-actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-top:16px}
.share-actions .primary{width:auto;margin:0}

.footer{max-width:1180px;margin:0 auto;padding:24px clamp(16px,4vw,48px) 40px;display:flex;flex-wrap:wrap;gap:6px 14px;align-items:center;color:var(--muted);position:relative;z-index:2}
.footer p{margin:0 auto 0 0}
.disclosure{flex-basis:100%;font-size:14px}
.notice{position:fixed;left:50%;bottom:16px;transform:translateX(-50%);z-index:20;max-width:calc(100vw - 32px)}
.notice:not(:empty){background:var(--line);color:var(--paper);padding:10px 16px;border-radius:12px}
.copy-fallback{display:block;width:min(80vw,360px);margin-top:6px;color:#222}
.devbar{position:fixed;bottom:0;left:0;right:0;display:flex;gap:4px;flex-wrap:wrap;padding:6px;background:#111;z-index:30}
.devbar button{font-size:12px;padding:4px 8px;background:#333;color:#fff;border:0;border-radius:4px;cursor:pointer}
.devbar .active{background:#e2452f}
.has-dev{padding-bottom:70px}

@media (max-width:820px){
  .hero{grid-template-columns:1fr;min-height:0;text-align:left}
  .hero-art{max-width:300px;order:-1}
  .cols,.pay,.result{grid-template-columns:1fr}
  .pay-side{position:static;grid-template-columns:110px 1fr;align-items:center;justify-items:start}
  .pay-bird{width:110px}
  .res-art{max-width:260px}
}
@media (max-width:420px){.amounts{grid-template-columns:repeat(2,1fr)}.amount-custom{grid-column:1/-1}}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}