/* /san-pham-mau: the L1 sample work as a page of its own, for links pasted into groups and chats.
   Same tokens, type and gold as the main site; no 3D, no scroll engine, so it opens fast inside Facebook/Zalo browsers. */
:root{color-scheme:dark;
  --gold:#D2A852; --gold-hi:#EDCF86; --gold-mid:#B08635; --gold-deep:#7A5B22; --on-gold:#120D08;
  --bg:#0B0A09; --fg:#F4F0E8; --muted:#A39888; --soft:#CFC5B7; --line:rgba(244,240,232,.11); --card:#151210;
  --sans:"Be Vietnam Pro","Segoe UI",Roboto,Helvetica,Arial,sans-serif; --mono:"JetBrains Mono",ui-monospace,Menlo,monospace;
  --out:cubic-bezier(.22,1,.36,1); --gut:clamp(16px,4.4vw,64px); --max:1360px;
  --side:max(var(--gut),calc((100vw - var(--max)) / 2 + var(--gut)))}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:84px}
body{background:var(--bg);color:var(--fg);font-family:var(--sans);font-size:16px;line-height:1.55;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
img{display:block;max-width:100%}
html[lang="vi"] [data-l="en"],html[lang="en"] [data-l="vi"]{display:none!important}
em{font-style:italic;color:var(--gold);padding-right:.06em}
.sp-wrap{width:100%;max-width:var(--max);margin:0 auto;padding:0 var(--gut)}
:focus-visible{outline:2px solid var(--gold-hi);outline-offset:3px;border-radius:6px}

/* top bar */
.sp-top{position:sticky;top:0;z-index:20;background:rgba(11,10,9,.82);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.sp-top .sp-wrap{display:flex;align-items:center;gap:12px;height:66px}
.sp-brand{display:flex;align-items:center;margin-right:auto}
.sp-brand svg{height:30px;width:auto}
.lang{position:relative;display:flex;padding:3px;border-radius:999px;background:rgba(244,240,232,.08)}
.lang button{position:relative;z-index:1;width:38px;height:30px;border-radius:999px;font-family:var(--mono);font-size:12px;color:var(--muted);transition:color .3s,background-color .3s}
.lang button[aria-pressed="true"]{color:var(--on-gold);background:var(--gold)}
.sp-btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;height:46px;padding:0 22px;border-radius:999px;font-weight:600;font-size:15px;white-space:nowrap;
  background:linear-gradient(180deg,var(--gold-hi),var(--gold) 55%,var(--gold-mid));color:var(--on-gold);box-shadow:inset 0 1px 0 rgba(255,255,255,.45),inset 0 -1px 0 rgba(0,0,0,.18);transition:transform .35s var(--out),filter .3s}
.sp-btn:hover{transform:translateY(-2px);filter:brightness(1.06)}
.sp-btn svg{width:17px;height:17px}
.sp-btn.ghost{background:rgba(244,240,232,.05);color:var(--fg);border:1px solid rgba(244,240,232,.25);box-shadow:none}
.sp-btn.ghost:hover{background:var(--fg);color:var(--bg);filter:none}
.sp-top .sp-btn{height:40px;padding:0 16px;font-size:14px}

/* hero: text beside a fan of the four covers (landscape), text over the fan (portrait) */
.sp-hero{position:relative;overflow:hidden;isolation:isolate;padding:clamp(56px,9vw,120px) 0 clamp(56px,8vw,110px)}
.sp-hero::before{content:"";position:absolute;inset:0;z-index:-2;background-image:radial-gradient(rgba(237,207,134,.16) 1.1px,transparent 1.6px);background-size:22px 22px;
  -webkit-mask:radial-gradient(ellipse 70% 80% at 70% 45%,#000 15%,transparent 75%);mask:radial-gradient(ellipse 70% 80% at 70% 45%,#000 15%,transparent 75%)}
.sp-hero::after{content:"";position:absolute;z-index:-1;width:80vw;height:80vw;right:-25vw;top:-30vw;border-radius:50%;background:radial-gradient(circle,rgba(210,168,82,.2),transparent 62%)}
.sp-hero .sp-wrap{display:grid;grid-template-columns:minmax(0,.95fr) minmax(0,1.05fr);gap:clamp(24px,4vw,64px);align-items:center}
.sp-kick{display:flex;align-items:center;gap:10px;font-family:var(--mono);font-size:13px;color:var(--gold-hi)}
.sp-kick b{font-weight:500;color:var(--on-gold);background:var(--gold);border-radius:7px;padding:2px 7px}
.sp-hero h1{margin-top:18px;font-size:clamp(50px,7.4vw,112px);line-height:1;letter-spacing:-.055em;font-weight:700;padding-bottom:.1em}
.sp-lead{margin-top:18px;max-width:36ch;font-size:clamp(16.5px,1.35vw,19px);color:var(--soft)}
.sp-index{margin-top:32px;display:grid;grid-template-columns:1fr 1fr;gap:8px;max-width:460px;list-style:none}
.sp-index a{display:flex;align-items:baseline;gap:10px;padding:12px 14px;border-radius:14px;border:1px solid var(--line);background:rgba(244,240,232,.03);font-weight:600;font-size:15px;line-height:1.3;transition:border-color .3s,background-color .3s}
.sp-index a i{font-style:normal;font-family:var(--mono);font-weight:500;font-size:11.5px;color:var(--gold-mid)}
.sp-index a:hover{border-color:rgba(237,207,134,.55);background:rgba(210,168,82,.1)}
.sp-fan{position:relative;width:100%;aspect-ratio:1.18;max-width:720px;justify-self:center}
.sp-card{position:absolute;width:62%;left:19%;top:22%;border-radius:10px;overflow:hidden;background:#221d19;box-shadow:0 30px 60px -10px rgba(0,0,0,.65),0 0 0 1px rgba(244,240,232,.08);
  transform:translate(var(--x),var(--y)) rotate(var(--r));transition:transform .6s var(--out)}
.sp-card img{width:100%;height:auto}
.sp-card:nth-child(1){--x:-30%;--y:-24%;--r:-9deg;z-index:1}
.sp-card:nth-child(2){--x:-10%;--y:-4%;--r:-3deg;z-index:2}
.sp-card:nth-child(3){--x:12%;--y:14%;--r:3deg;z-index:3}
.sp-card:nth-child(4){--x:30%;--y:34%;--r:8deg;z-index:4}
@media (hover:hover){.sp-card:hover{transform:translate(var(--x),calc(var(--y) - 5%)) rotate(var(--r)) scale(1.03);z-index:6}}

/* document sections */
.sp-doc{padding:clamp(56px,7vw,96px) 0 0;border-top:1px solid var(--line);overflow:hidden}  /* clips the strip while it slides in, so the page never widens */
.sp-dhead{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:8px 22px;align-items:end}
.sp-num{font-family:var(--mono);font-size:clamp(34px,4vw,56px);line-height:1;color:var(--gold);letter-spacing:-.04em}
.sp-dhead h2{font-size:clamp(30px,3.6vw,52px);line-height:1.08;letter-spacing:-.045em;font-weight:700;padding-bottom:.06em}
.sp-meta{margin-top:6px;color:var(--muted);font-size:15px;line-height:1.5}
.sp-meta b{color:var(--fg);font-weight:600}
.sp-ctl{display:flex;align-items:center;gap:8px}
.sp-arr{width:44px;height:44px;border-radius:999px;border:1px solid rgba(244,240,232,.2);display:grid;place-items:center;transition:background-color .3s,color .3s,border-color .3s,opacity .3s}
.sp-arr svg{width:18px;height:18px}
.sp-arr:hover{background:var(--gold);border-color:var(--gold);color:var(--on-gold)}
.sp-arr:disabled{opacity:.3;pointer-events:none}
.sp-n{min-width:70px;text-align:center;font-family:var(--mono);font-size:13px;color:var(--soft)}
.sp-track{margin-top:26px;display:flex;gap:clamp(12px,1.6vw,22px);overflow-x:auto;overflow-y:hidden;scroll-snap-type:x mandatory;scroll-padding-inline:var(--side);padding:6px var(--side) clamp(44px,5vw,64px);
  scrollbar-width:none;overscroll-behavior-x:contain;outline:none}
.sp-track::-webkit-scrollbar{display:none}
.sp-pg{position:relative;flex:0 0 auto;width:min(72vw,980px);aspect-ratio:var(--ar);scroll-snap-align:start;border-radius:10px;overflow:hidden;background:#1c1815;
  box-shadow:0 26px 60px -18px rgba(0,0,0,.7),0 0 0 1px rgba(244,240,232,.07);transition:transform .45s var(--out)}
.sp-pg img{width:100%;height:100%;object-fit:contain}
.sp-pg::after{content:"↗";position:absolute;right:12px;top:12px;width:34px;height:34px;border-radius:999px;display:grid;place-items:center;font-size:14px;color:var(--fg);background:rgba(11,10,9,.6);
  backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);opacity:0;transition:opacity .3s}
@media (hover:hover){.sp-pg:hover::after{opacity:1}}
.sp-cat .sp-pg{width:min(84vw,1180px)}
.sp-track-end{flex:0 0 1px}

/* closing call */
.sp-cta{padding:clamp(72px,9vw,130px) 0;border-top:1px solid var(--line);text-align:center;position:relative;overflow:hidden;isolation:isolate}
.sp-cta::before{content:"";position:absolute;z-index:-1;left:50%;top:-40%;width:900px;height:900px;margin-left:-450px;border-radius:50%;background:radial-gradient(circle,rgba(210,168,82,.16),transparent 60%)}
.sp-cta h2{font-size:clamp(32px,4.4vw,64px);line-height:1.06;letter-spacing:-.05em;font-weight:700;max-width:18ch;margin:0 auto;padding-bottom:.08em;text-wrap:balance}
.sp-cta p{margin:18px auto 0;max-width:46ch;color:var(--soft);font-size:clamp(16px,1.3vw,18px)}
.sp-cta-row{margin-top:32px;display:flex;flex-wrap:wrap;justify-content:center;gap:12px}
.sp-cta-row .sp-btn{height:54px;padding:0 26px;font-size:16px}
.sp-mail{display:inline-block;margin-top:26px;font-family:var(--mono);font-size:14px;color:var(--gold-hi);border-bottom:1px solid rgba(237,207,134,.35);padding-bottom:2px}
.sp-foot{border-top:1px solid var(--line);padding:26px 0 calc(26px + env(safe-area-inset-bottom,0px));color:var(--muted);font-size:13.5px}
.sp-foot .sp-wrap{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}

@media (max-width:900px){
  .sp-hero .sp-wrap{grid-template-columns:minmax(0,1fr)}
  .sp-fan{order:-1;max-width:560px;width:100%;aspect-ratio:1.45;margin:-4px auto 0}
  .sp-index{max-width:none}
}
@media (max-width:760px){
  .sp-top .sp-wrap{height:60px}
  .sp-brand svg{height:26px}
  .sp-top .sp-btn{display:none}
  .sp-hero{padding-top:28px}
  .sp-hero h1{font-size:clamp(46px,13vw,64px);margin-top:14px}
  .sp-index a{padding:11px 12px;font-size:14.5px}
  .sp-dhead{grid-template-columns:auto minmax(0,1fr);align-items:start}
  .sp-num{font-size:30px;margin-top:4px}
  .sp-ctl{grid-column:1 / -1;margin-top:10px}
  .sp-meta{font-size:14px}
  .sp-track{margin-top:18px}
  .sp-pg,.sp-cat .sp-pg{width:86vw;border-radius:8px}
  .sp-cta-row .sp-btn{width:100%}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.sp-card,.sp-pg,.sp-btn{transition:none}}

/* ---------- motion: transform and opacity only (compositor), continuous loops paused off screen (.off),
   all of it gated on html.mo, which reduced-motion never sets and which is dropped if the page script fails ---------- */
.sp-prog{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:linear-gradient(90deg,var(--gold-mid),var(--gold-hi));transform-origin:0 50%;transform:scaleX(0);pointer-events:none}
.w{display:inline-block}
.w-em{position:relative}
.sp-swash{position:absolute;left:3%;right:6%;bottom:-.1em;width:94%;height:.16em;overflow:visible;pointer-events:none}
.sp-swash path{fill:none;stroke:var(--gold-hi);stroke-width:3px;stroke-linecap:round;vector-effect:non-scaling-stroke;stroke-dasharray:1;stroke-dashoffset:0}
@keyframes sp-rise{from{opacity:0;transform:translateY(.42em) rotate(4deg)}}
@keyframes sp-up{from{opacity:0;transform:translateY(20px)}}
@keyframes sp-draw{from{stroke-dashoffset:1}}
@keyframes sp-deal{from{opacity:0;transform:translate(0,18%) rotate(0deg) scale(.84)}}
@keyframes sp-bob{0%,100%{translate:0 0}50%{translate:0 -10px}}
@keyframes sp-run{to{transform:translateX(-50%)}}
@keyframes sp-spin{to{transform:rotate(360deg)}}
.mo .sp-hero .w{animation:sp-rise .95s var(--out) backwards;animation-delay:calc(.12s + var(--i) * .09s);transform-origin:0 100%}
.mo .sp-hero .w-em em{display:inline-block}
.mo .sp-swash path{animation:sp-draw 1s var(--out) 1s backwards}
.mo .sp-hero .hr{animation:sp-up .9s var(--out) backwards;animation-delay:calc(.1s + var(--d) * .06s)}
.mo .sp-card{animation:sp-deal 1.1s var(--out) backwards,sp-bob 6.5s ease-in-out infinite;animation-delay:calc(.3s + var(--i) * .11s),calc(var(--i) * -1.6s)}
.sp-hero.off .sp-card,.sp-tapes.off .sp-tape-run,.sp-cta.off .sp-seal svg{animation-play-state:paused}
.sp-fan{transition:transform .8s var(--out)}
/* gold tape between hero and documents */
.sp-tapes{overflow:hidden;padding:26px 0 30px;margin-top:-34px;position:relative;z-index:2}
.sp-tape{width:106%;margin-left:-3%;transform:rotate(-2.2deg);background:var(--gold);color:var(--on-gold);box-shadow:0 18px 40px rgba(0,0,0,.5);padding:11px 0}
.sp-tape-run{display:flex;align-items:center;width:max-content}
.mo .sp-tape-run{animation:sp-run 42s linear infinite}
.sp-tape span{font-weight:700;font-size:clamp(18px,2.2vw,30px);letter-spacing:-.025em;text-transform:uppercase;white-space:nowrap;line-height:1.35}
.sp-tape i{font-style:normal;font-size:clamp(13px,1.3vw,18px);margin:0 clamp(16px,2vw,28px)}
/* reveals for the documents and the closing call */
.mo :is(.sp-doc,.sp-cta) .rv{transition:opacity .8s var(--out),transform .9s var(--out);transition-delay:calc(var(--d,0) * 90ms)}
.mo :is(.sp-doc,.sp-cta):not(.in) .rv{opacity:0;transform:translateY(26px)}
/* the whole strip slides in: moving the pages themselves would shift their snap points (Chrome snaps to the transformed box) */
.mo .sp-doc .sp-track{transition:translate 1.1s var(--out) .2s,opacity .8s var(--out) .2s}
.mo .sp-doc:not(.in) .sp-track{translate:90px 0;opacity:0}
.mo .sp-pg img{transition:opacity .55s var(--out)}
.mo .sp-pg:not(.on) img{opacity:.42}
.sp-bar{height:2px;margin-top:calc(-1 * clamp(26px,3vw,40px));border-radius:2px;background:var(--line);overflow:hidden}
.sp-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--gold-mid),var(--gold-hi));transform-origin:0 50%;transition:transform .35s var(--out)}
/* turning seal over the closing heading */
.sp-seal{position:relative;width:118px;height:118px;margin:0 auto 26px;display:grid;place-items:center}
.sp-seal svg{position:absolute;inset:0;width:100%;height:100%;overflow:visible}
.mo .sp-seal svg{animation:sp-spin 16s linear infinite}
.sp-seal text{font-family:var(--mono);font-size:14px;letter-spacing:.04em;fill:var(--soft)}
.sp-seal b{width:56px;height:56px;border-radius:50%;background:linear-gradient(180deg,var(--gold-hi),var(--gold) 55%,var(--gold-mid));color:var(--on-gold);display:grid;place-items:center;font-size:16px;font-weight:700;letter-spacing:-.02em}
.sp-index a{position:relative;overflow:hidden}
.sp-index a::after{content:"↓";margin-left:auto;font-size:13px;color:var(--gold-hi);opacity:0;transform:translateY(-6px);transition:opacity .3s,transform .4s var(--out)}
.sp-index a:hover::after{opacity:1;transform:none}
@media (max-width:760px){.sp-tapes{margin-top:-22px;padding:20px 0 24px}.sp-tape{padding:9px 0}.sp-seal{width:100px;height:100px}.sp-seal b{width:48px;height:48px;font-size:14px}}
@media (prefers-reduced-motion:reduce){.sp-fan,.sp-bar i,.sp-index a::after{transition:none}}