/* PetWords landing: cùng ngôn ngữ visual với app — nền đêm, khung vàng,
   font Coiny (tiêu đề) + Mali (nội dung), nút chunky kiểu game. */
:root{
  --night:#141033; --night2:#1D1640; --panel:#2B2358; --panel-line:#3D3270;
  --deep:#0F0B26; --ink:#F4EEFF; --muted:#C9BFE8;
  --gold:#E8B84A; --gold-light:#FFD36B; --gold-dark:#C98A12; --on-gold:#3A2400;
  --green:#22C55E; --green-dark:#15803D; --pink:#FF4D6D; --xp:#4D96FF; --teal:#00C9A7;
  --font-display:'Coiny','Baloo 2',system-ui,sans-serif;
  --font-body:'Mali',system-ui,-apple-system,'Segoe UI',sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
section[id]{scroll-margin-top:70px}
body{margin:0;font-family:var(--font-body);background:var(--night);color:var(--ink);line-height:1.6}
body::before{content:'';position:fixed;inset:0;z-index:-1;pointer-events:none;
  background-image:
    radial-gradient(circle at 50% -10%,rgba(178,107,255,.30),transparent 55%),
    radial-gradient(circle at 88% 18%,rgba(255,201,60,.14),transparent 42%),
    radial-gradient(1.5px 1.5px at 12% 9%,#fff 50%,transparent 51%),
    radial-gradient(1.5px 1.5px at 82% 6%,#FFE9A8 50%,transparent 51%),
    radial-gradient(1px 1px at 30% 22%,#fff 50%,transparent 51%),
    radial-gradient(1.5px 1.5px at 65% 30%,#fff 50%,transparent 51%),
    radial-gradient(rgba(255,255,255,.10) 1px,transparent 1.6px);
  background-size:auto,auto,auto,auto,auto,auto,34px 34px}
::selection{background:var(--gold);color:var(--on-gold)}
a{color:inherit}
a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--gold-light);outline-offset:2px}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
header{position:sticky;top:0;z-index:10;background:rgba(20,16,51,.90);backdrop-filter:blur(8px);border-bottom:2px solid rgba(232,184,74,.35)}
.nav{display:flex;align-items:center;gap:16px;padding:12px 0}
.logo{text-decoration:none}
.logo img{height:44px;width:auto;display:block}
.nav-links{margin-left:auto;display:flex;gap:14px;flex-wrap:wrap}
.nav-links a{text-decoration:none;font-weight:600;color:var(--muted);border-bottom:2px solid transparent}
.nav-links a:hover{color:var(--ink);border-color:var(--gold)}
.btn{display:inline-block;text-decoration:none;font-family:var(--font-display);font-size:16px;letter-spacing:.3px;border-radius:16px;padding:12px 22px;border:2px solid var(--deep);box-shadow:0 5px 0 var(--deep);transition:transform .08s,box-shadow .08s;cursor:pointer}
.btn:active{transform:translateY(4px);box-shadow:0 1px 0 var(--deep)}
.btn-yellow,.btn-gold{background:linear-gradient(#FFD36B,#E8B84A);color:var(--on-gold)}
.btn-green{background:linear-gradient(#2BD97C,#16A34A);color:#fff}
.btn-white{background:#fff;color:#241B4D}
.btn[aria-disabled='true']{opacity:.55;pointer-events:none;box-shadow:0 2px 0 var(--deep)}
.banner{display:none;margin:18px 0 0;border:2px solid var(--gold);border-radius:18px;padding:14px 18px;font-weight:600;background:rgba(255,201,60,.14);color:#FFE9A8}
.banner.show{display:block}
.banner.warn{border-color:var(--gold)}
.banner.info{border-color:var(--xp);background:rgba(77,150,255,.14);color:#D6E6FF}
.banner a{font-weight:800;color:var(--gold-light)}
.hero{display:grid;grid-template-columns:1.05fr .95fr;gap:32px;align-items:center;padding:48px 0 24px}
.badge{display:inline-block;background:var(--gold);color:var(--on-gold);font-family:var(--font-display);font-size:14px;letter-spacing:.4px;padding:6px 14px;border-radius:999px;border:2px solid var(--deep);box-shadow:0 3px 0 var(--deep);transform:rotate(-2deg)}
h1{font-family:var(--font-display);font-weight:400;font-size:54px;line-height:1.15;margin:16px 0 12px;text-shadow:0 3px 0 rgba(0,0,0,.4)}
h1 em{font-style:normal;color:var(--gold-light)}
.lead{font-size:18px;color:var(--muted);margin:0 0 22px}
.store-row{display:flex;gap:12px;flex-wrap:wrap}
.hero-note{font-size:14px;font-weight:600;color:var(--muted);margin:14px 0 0}
.hero-note::before{content:'';display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--gold);margin-right:8px}
.game-demo{background:linear-gradient(var(--night2),var(--night));border:3px solid var(--gold-dark);border-radius:28px;padding:20px;box-shadow:0 8px 0 rgba(0,0,0,.35),0 0 44px rgba(178,107,255,.22);transform:rotate(.7deg)}
.game-hud{display:flex;gap:10px;align-items:center;margin-bottom:14px}
.hud-hearts{display:flex;gap:3px}
.hud-hearts svg{width:22px;height:22px;fill:var(--pink);filter:drop-shadow(0 2px 0 rgba(0,0,0,.4))}
.hud-hearts svg.lost{fill:#4A4468}
.hud-xp{flex:1;display:flex;gap:8px;align-items:center;font-weight:700;font-size:13px;color:var(--gold-light)}
.xp-track{flex:1;height:14px;background:var(--deep);border:2px solid var(--deep);border-radius:999px;overflow:hidden}
.xp-fill{display:block;height:100%;width:0%;background:linear-gradient(90deg,var(--xp),var(--teal));transition:width .5s}
.hud-level{font-family:var(--font-display);font-size:14px;background:var(--gold);color:var(--on-gold);padding:3px 11px;border-radius:999px;border:2px solid var(--deep);box-shadow:0 2px 0 var(--deep)}
.game-pet{text-align:center}
.game-pet img{width:150px;height:150px;object-fit:contain;filter:drop-shadow(0 12px 0 rgba(0,0,0,.30));animation:float 3.5s ease-in-out infinite}
.pet-tag{display:inline-block;font-weight:700;font-size:13px;color:var(--gold-light);background:#17123A;border:2px solid rgba(232,184,74,.4);border-radius:999px;padding:5px 13px;margin-top:10px}
.quiz-q{text-align:center;font-weight:600;color:var(--muted);margin:16px 0 2px}
.quiz-term{text-align:center;font-family:var(--font-display);font-size:42px;margin:0 0 14px;text-shadow:0 3px 0 rgba(0,0,0,.4)}
.quiz-opts{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.quiz-opt{font:inherit;font-weight:700;font-size:16px;color:var(--ink);background:#3A2F73;border:2px solid var(--deep);border-radius:16px;padding:12px 10px;box-shadow:0 4px 0 var(--deep);cursor:pointer;transition:transform .08s,box-shadow .08s}
.quiz-opt:hover:not(:disabled){transform:translateY(-1px)}
.quiz-opt:active:not(:disabled){transform:translateY(3px);box-shadow:0 1px 0 var(--deep)}
.quiz-opt:disabled{cursor:default;opacity:.55}
.quiz-opt.correct:disabled{opacity:1;background:linear-gradient(#2BD97C,#16A34A);color:#fff}
.quiz-opt.wrong:disabled{opacity:1;background:#FF5A5F;color:#fff;animation:shake .35s}
.quiz-msg{text-align:center;color:var(--muted);font-size:14px;min-height:21px;margin:12px 0}
.quiz-next{display:block;margin:0 auto}
.quiz-next[hidden]{display:block;visibility:hidden}
.pet-strip{display:flex;gap:14px;flex-wrap:wrap;justify-content:center;margin:10px 0 6px}
.pet-tile{margin:0;width:104px;text-align:center;transition:transform .15s}
.pet-tile img{width:96px;height:96px;object-fit:contain;background:var(--panel);border:2px solid rgba(232,184,74,.35);border-radius:22px;padding:8px;box-shadow:0 4px 0 rgba(0,0,0,.35);display:block;margin:0 auto 6px}
.pet-tile:nth-child(odd){transform:rotate(-2deg)}
.pet-tile:nth-child(even){transform:rotate(2deg)}
.pet-tile:hover{transform:rotate(0deg) scale(1.06)}
.pet-tile figcaption{font-weight:700;font-size:14px;color:var(--gold-light)}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:14px 0 4px}
.stat{background:var(--panel);border:2px solid rgba(232,184,74,.4);border-radius:20px;padding:14px;text-align:center;box-shadow:0 4px 0 rgba(0,0,0,.35)}
.stat:nth-child(odd){transform:rotate(-.6deg)}
.stat:nth-child(even){transform:rotate(.6deg)}
.stat b{display:block;font-family:var(--font-display);font-weight:400;font-size:30px;line-height:1.1;color:var(--gold-light)}
.stat span{color:var(--muted);font-size:14px}
section{padding:44px 0}
h2{font-family:var(--font-display);font-weight:400;font-size:34px;margin:0 0 8px;text-shadow:0 3px 0 rgba(0,0,0,.35)}
h2::after{content:'';display:block;width:56px;height:6px;background:var(--gold);border-radius:999px;margin-top:10px;box-shadow:0 2px 0 rgba(0,0,0,.3)}
.sec-sub{color:var(--muted);margin:0 0 22px;font-size:17px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.grid.two{grid-template-columns:repeat(2,1fr)}
.card{background:var(--panel);border:2px solid var(--panel-line);border-radius:24px;padding:20px;box-shadow:0 5px 0 rgba(0,0,0,.35);transition:transform .15s,border-color .15s}
.card h3{margin:0 0 8px;font-size:19px}
.card p{margin:0;color:var(--muted)}
.card .big{font-size:15px;color:var(--ink);font-weight:700}
.feat:hover{transform:translateY(-2px);border-color:rgba(232,184,74,.6)}
.feat-art{width:72px;height:72px;object-fit:contain;background:#17123A;border:2px solid rgba(232,184,74,.35);border-radius:18px;padding:6px;display:block;margin-bottom:12px;box-shadow:0 3px 0 rgba(0,0,0,.35)}
.formula{background:var(--deep);color:var(--gold-light);border:2px solid rgba(232,184,74,.35);border-radius:14px;padding:10px 12px;font-weight:700;margin:8px 0;overflow-x:auto;white-space:nowrap}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.step{background:var(--panel);border:2px solid var(--panel-line);border-radius:24px;padding:20px;box-shadow:0 5px 0 rgba(0,0,0,.35);transition:transform .15s,border-color .15s}
.step:hover{transform:translateY(-2px);border-color:rgba(232,184,74,.6)}
.step b{display:inline-block;background:linear-gradient(#FFD36B,#E8B84A);color:var(--on-gold);font-family:var(--font-display);font-weight:400;font-size:18px;border:2px solid var(--deep);border-radius:999px;width:36px;height:36px;line-height:32px;text-align:center;box-shadow:0 3px 0 var(--deep)}
.step-art{width:64px;height:64px;object-fit:contain;background:#17123A;border:2px solid rgba(232,184,74,.35);border-radius:16px;padding:6px;display:block;margin:12px 0;box-shadow:0 3px 0 rgba(0,0,0,.35)}
.step h3{margin:0 0 6px;font-size:19px}
.step p{margin:0;color:var(--muted)}
.event-tag{display:inline-block;background:var(--pink);color:#fff;font-size:13px;font-weight:800;padding:3px 10px;border-radius:999px;margin-bottom:8px;border:2px solid rgba(0,0,0,.25);box-shadow:0 2px 0 rgba(0,0,0,.3)}
.event-time{color:var(--gold-light);font-size:14px;font-weight:700}
.empty{color:var(--muted);font-size:17px}
.cta{position:relative;background:linear-gradient(#FFD36B,#E8B84A 60%,#D99A1F);border:3px solid var(--deep);border-radius:28px;padding:34px;text-align:center;box-shadow:0 6px 0 rgba(0,0,0,.4);color:var(--on-gold)}
.cta h2{color:var(--on-gold);text-shadow:none}
.cta h2::after{background:rgba(58,36,0,.35);box-shadow:none;margin-left:auto;margin-right:auto}
.cta p{color:#5A3A00}
.cta-pet{position:absolute;right:28px;top:-34px;width:110px;transform:rotate(8deg);filter:drop-shadow(0 10px 0 rgba(0,0,0,.25));animation:float-tilt 4s ease-in-out infinite}
footer{border-top:2px solid #2C2D47;padding:26px 0 40px;color:var(--muted);font-size:14px}
footer a{font-weight:700;color:var(--gold-light)}
.mech-list{display:flex;flex-direction:column;gap:8px}
.mech{background:var(--panel);border:2px solid var(--panel-line);border-radius:22px;box-shadow:0 4px 0 rgba(0,0,0,.35);overflow:hidden}
.mech[open]{border-color:rgba(232,184,74,.55)}
.mech summary{cursor:pointer;list-style:none;display:flex;align-items:center;gap:12px;padding:12px 16px}
.mech summary::-webkit-details-marker{display:none}
.mech-main{display:flex;flex-direction:column}
.mech-main b{font-size:17px}
.mech-main span{color:var(--muted);font-size:13px}
.mech-arrow{margin-left:auto;font-size:20px;color:var(--gold);font-weight:900;transition:transform .15s;line-height:1}
.mech[open] .mech-arrow{transform:rotate(180deg)}
.mech-body{padding:0 16px 14px;font-size:15px}
.mech-body p{margin:0 0 8px;color:var(--muted)}
.mech-body .big{font-size:15px;color:var(--ink);font-weight:700}
.mech-body p:last-child{margin-bottom:0}
.cat-head{margin:22px 0 10px;font-family:var(--font-display);font-weight:400;font-size:22px;color:var(--gold-light);display:flex;align-items:center;gap:10px;scroll-margin-top:70px;text-shadow:0 2px 0 rgba(0,0,0,.35)}
.cat-head i{width:14px;height:14px;border-radius:4px;background:var(--gold);border:2px solid var(--deep);display:inline-block;flex:none}
.mech-body ul{margin:8px 0;padding-left:20px;color:var(--muted)}
.mech-body li{margin-bottom:6px}
.mech-body li b{color:var(--ink)}
.tbl{width:100%;border-collapse:collapse;margin:10px 0;font-size:15px}
.tbl th{color:var(--gold-light);font-size:13px;text-align:left}
.tbl td,.tbl th{border-bottom:1px solid var(--panel-line);padding:6px 8px}
.slot-row{display:flex;gap:14px;flex-wrap:wrap;margin:12px 0}
.slot{text-align:center;width:88px}
.slot img{width:64px;height:64px;object-fit:contain;background:#17123A;border:2px solid rgba(232,184,74,.35);border-radius:16px;padding:6px;display:block;margin:0 auto 6px}
.slot b{display:block;font-size:14px;color:var(--ink)}
.slot span{font-size:13px;color:var(--muted)}
.guide-nav{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:4px}
.guide-nav a{display:inline-block;text-decoration:none;font-weight:700;font-size:14px;background:var(--panel);color:var(--ink);border:2px solid var(--panel-line);border-radius:999px;padding:6px 14px;box-shadow:0 3px 0 rgba(0,0,0,.35)}
.guide-nav a:hover{border-color:rgba(232,184,74,.6)}
.guide-tools{margin-left:auto;display:flex;gap:8px}
.guide-tools button{cursor:pointer;font:inherit;font-size:14px;font-weight:700;background:linear-gradient(#FFD36B,#E8B84A);color:var(--on-gold);border:2px solid var(--deep);border-radius:999px;padding:6px 14px;box-shadow:0 3px 0 var(--deep)}
.guide-tools button:active{transform:translateY(2px);box-shadow:0 1px 0 var(--deep)}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
@keyframes float-tilt{0%,100%{transform:rotate(8deg) translateY(0)}50%{transform:rotate(8deg) translateY(-8px)}}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}
@media (max-width:820px){
  .wrap{padding:0 16px}
  .nav{padding:8px 0}
  .logo img{height:36px}
  .nav-links{display:none}
  .btn{padding:11px 18px}
  .hero{grid-template-columns:1fr;padding-top:28px}
  .game-demo{transform:none}
  h1{font-size:38px}
  h2{font-size:26px}
  .lead{font-size:17px}
  section{padding:30px 0}
  .grid,.grid.two,.steps{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .stat b{font-size:22px}
  .pet-tile{width:88px}
  .pet-tile img{width:80px;height:80px}
  .store-row{flex-direction:column}
  .store-row .btn{width:100%;text-align:center}
  .cta{padding:24px 18px}
  .cta-pet{display:none}
  .guide-tools{margin-left:0}
  .cat-head{scroll-margin-top:64px}
  section[id]{scroll-margin-top:64px}
  .mech-main{min-width:0}
  .mech-arrow{flex:none}
  .slot{width:76px}
  .slot img{width:56px;height:56px}
  .tbl{font-size:14px}
  .banner{padding:12px 14px}
  footer{padding:20px 0 32px}
}
@media (max-width:480px){
  h1{font-size:32px}
  .logo img{height:32px}
  .quiz-opts{grid-template-columns:1fr}
  .quiz-term{font-size:32px}
  .pet-tile{width:76px}
  .pet-tile img{width:68px;height:68px}
  .btn{padding:11px 16px;font-size:15px}
  .hero{padding-top:20px}
  section{padding:24px 0}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .game-pet img,.cta-pet{animation:none}
}
.evo{margin-top:24px;background:linear-gradient(var(--night2),var(--night));border:2px solid rgba(232,184,74,.4);border-radius:26px;padding:22px;box-shadow:0 5px 0 rgba(0,0,0,.35)}
.evo h3{font-family:var(--font-display);font-weight:400;font-size:24px;margin:0 0 6px;text-shadow:0 2px 0 rgba(0,0,0,.35)}
.evo-sub{color:var(--muted);margin:0 0 16px}
.evo-strip{display:flex;align-items:flex-end;justify-content:center;gap:10px;flex-wrap:wrap}
.evo-stage{margin:0;text-align:center}
.evo-stage img{display:block;margin:0 auto 8px;object-fit:contain}
.evo-stage.s0 img{height:84px}
.evo-stage.s1 img{height:76px}
.evo-stage.s2 img{height:88px}
.evo-stage.s3 img{height:100px}
.evo-stage.s4 img{height:112px}
.evo-stage.s5 img{height:124px}
.evo-stage figcaption{font-weight:700;font-size:14px;color:var(--ink)}
.evo-stage figcaption span{display:block;font-size:13px;color:var(--gold-light)}
.evo-stage.s5 figcaption{color:var(--gold-light)}
.evo-arrow{align-self:center;font-size:22px;color:var(--gold);font-weight:900}
.evo-note{color:var(--muted);font-size:14px;margin:16px 0 0;text-align:center}
.evo-note a{color:var(--gold-light);font-weight:700}
@media (max-width:820px){
  .evo-arrow{display:none}
  .evo-strip{gap:14px}
  .evo-stage.s0 img{height:68px}
  .evo-stage.s1 img{height:60px}
  .evo-stage.s2 img{height:70px}
  .evo-stage.s3 img{height:80px}
  .evo-stage.s4 img{height:90px}
  .evo-stage.s5 img{height:100px}
}