/* ============================================================
   PIPO GROUP — Trang giới thiệu trung tâm tiếng Anh
   Bảng màu & font lấy theo bộ nhận diện của ứng dụng pipogroup.vn
   ============================================================ */
:root{
  --font-title:"Fredoka","Quicksand",system-ui,-apple-system,sans-serif;
  --font-body:"Quicksand",system-ui,-apple-system,sans-serif;

  --abyss:#010a1e;
  --deep-blue:#041d49;
  --ocean:#0a4076;
  --sea-blue:#1481b8;
  --cyan:#0bc9da;
  --seaweed:#169c59;
  --seaweed-light:#17cf63;
  --starfish:#f9591f;
  --starfish-light:#ff824c;
  --coral-pink:#f6558b;
  --shell-pink:#f589bf;
  --gold:#ffc61a;
  --gold-light:#ffdb4c;
  --pearl:#ececf9;

  --ink:#ececf9;
  --ink-soft:#a8b6d9;
  --ink-faint:#6d7fa8;

  --glass-bg:rgba(6,26,75,.45);
  --glass-bg-light:rgba(255,255,255,.06);
  --glass-border:rgba(255,255,255,.10);
  --glass-border-glow:rgba(0,242,254,.25);
  --blur:blur(12px);

  --shadow-card:0 8px 32px rgba(0,3,30,.37);
  --shadow-lift:0 18px 50px rgba(0,3,30,.55);
  --glow-cyan:0 0 24px rgba(11,201,218,.40);
  --glow-gold:0 0 24px rgba(255,198,26,.45);

  --r-sm:12px; --r-md:18px; --r-lg:26px; --r-xl:34px;
  --maxw:1180px;
  --header-h:74px;
  --pad:clamp(20px,5vw,48px);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:var(--font-body);
  font-weight:500;
  color:var(--ink);
  background:var(--abyss);
  line-height:1.65;
  overflow-x:hidden;
}
h1,h2,h3,h4{font-family:var(--font-title);font-weight:600;line-height:1.15;margin:0 0 .5em}
p{margin:0 0 1em}
a{color:inherit;text-decoration:none}
img,svg{max-width:100%;display:block}
ul{margin:0;padding:0;list-style:none}
:focus-visible{outline:3px solid var(--cyan);outline-offset:3px;border-radius:6px}

/* ---------- Nền đại dương ---------- */
.sea-bg{position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:
    radial-gradient(1200px 700px at 78% -8%, rgba(11,201,218,.20), transparent 60%),
    radial-gradient(900px 600px at 12% 12%, rgba(246,85,139,.14), transparent 62%),
    radial-gradient(1000px 800px at 50% 108%, rgba(20,129,184,.22), transparent 66%),
    linear-gradient(180deg,#041d49 0%,#02123a 45%,#010a1e 100%);
}
/* tia sáng xuyên nước */
.sea-rays{position:fixed;inset:0;z-index:-2;pointer-events:none;opacity:.28;
  background:repeating-linear-gradient(102deg,
    transparent 0 60px, rgba(180,238,255,.055) 60px 100px, transparent 100px 190px);
  mask-image:linear-gradient(180deg,#000 0%,rgba(0,0,0,.5) 45%,transparent 78%);
  -webkit-mask-image:linear-gradient(180deg,#000 0%,rgba(0,0,0,.5) 45%,transparent 78%);
  animation:rays 24s ease-in-out infinite alternate;
}
@keyframes rays{from{transform:translateX(-3%) skewX(0deg)}to{transform:translateX(3%) skewX(-2deg)}}

.bubbles{position:fixed;inset:0;z-index:-1;pointer-events:none;overflow:hidden}
.bubble{position:absolute;bottom:-12vh;border-radius:50%;
  background:radial-gradient(circle at 32% 28%, rgba(255,255,255,.75), rgba(160,225,255,.18) 46%, rgba(11,201,218,.05) 70%);
  border:1px solid rgba(255,255,255,.18);
  animation:rise linear infinite;
}
@keyframes rise{
  0%{transform:translate3d(0,0,0) scale(.7);opacity:0}
  10%{opacity:.55}
  50%{transform:translate3d(26px,-52vh,0) scale(1)}
  90%{opacity:.35}
  100%{transform:translate3d(-18px,-108vh,0) scale(1.08);opacity:0}
}

/* ---------- Bố cục chung ---------- */
.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--pad)}
section{padding-block:clamp(64px,9vw,116px);position:relative}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-title);font-size:.8rem;font-weight:600;
  letter-spacing:.14em;text-transform:uppercase;color:var(--cyan);
  background:rgba(11,201,218,.10);border:1px solid rgba(11,201,218,.28);
  padding:7px 15px;border-radius:999px;margin-bottom:18px;
}
.eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--cyan);box-shadow:var(--glow-cyan)}
.sec-head{max-width:660px;margin-bottom:clamp(36px,5vw,56px)}
.sec-head.center{margin-inline:auto;text-align:center}
.sec-head h2{font-size:clamp(1.85rem,4.2vw,2.85rem);letter-spacing:-.02em}
.sec-head p{color:var(--ink-soft);font-size:clamp(1rem,1.6vw,1.12rem);margin-bottom:0}
.grad{background:linear-gradient(96deg,var(--cyan),var(--gold) 48%,var(--coral-pink));
  -webkit-background-clip:text;background-clip:text;color:transparent}

.card{
  background:var(--glass-bg);border:1px solid var(--glass-border);
  border-radius:var(--r-lg);padding:clamp(22px,3vw,30px);
  backdrop-filter:var(--blur);-webkit-backdrop-filter:var(--blur);
  box-shadow:var(--shadow-card);position:relative;overflow:hidden;
  transition:transform .35s cubic-bezier(.2,.7,.3,1),border-color .35s,box-shadow .35s;
}
.card::after{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
  background:linear-gradient(150deg,rgba(255,255,255,.10),transparent 42%);opacity:.7}
.card:hover{transform:translateY(-6px);border-color:var(--glass-border-glow);box-shadow:var(--shadow-lift)}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  font-family:var(--font-title);font-weight:600;font-size:1rem;
  padding:14px 28px;border-radius:999px;border:1px solid transparent;
  cursor:pointer;transition:transform .25s,box-shadow .25s,background .25s,border-color .25s;
  white-space:nowrap;
}
.btn-primary{background:linear-gradient(96deg,var(--gold),var(--starfish-light));color:#2a1400;box-shadow:var(--glow-gold)}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 0 34px rgba(255,198,26,.6)}
.btn-ghost{background:var(--glass-bg-light);border-color:var(--glass-border);color:var(--ink);backdrop-filter:var(--blur)}
.btn-ghost:hover{transform:translateY(-3px);border-color:var(--glass-border-glow);background:rgba(255,255,255,.11)}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:60;transition:background .3s,border-color .3s;
  border-bottom:1px solid transparent}
.site-header.scrolled{background:rgba(2,15,45,.78);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border-bottom-color:var(--glass-border)}
.site-header .wrap{max-width:1340px}
.nav{display:flex;align-items:center;justify-content:space-between;gap:clamp(14px,2.4vw,32px);min-height:var(--header-h)}
.brand{display:flex;align-items:center;gap:12px;font-family:var(--font-title);font-weight:700;
  font-size:1.5rem;letter-spacing:-.015em;line-height:1.15;min-width:0}
.brand-mark{width:46px;height:46px;flex:none;border-radius:14px;display:grid;place-items:center;font-size:1.45rem;
  background:linear-gradient(140deg,var(--cyan),var(--sea-blue) 55%,var(--coral-pink));
  box-shadow:var(--glow-cyan)}
.brand small{display:block;font-family:var(--font-body);font-size:.63rem;font-weight:600;
  letter-spacing:.2em;text-transform:uppercase;color:var(--cyan);line-height:1;margin-top:3px;
  overflow:hidden;text-overflow:ellipsis}
.nav-drawer{display:contents}
.nav-drawer__foot{display:none}
.nav-links{display:flex;align-items:center;gap:2px}
.nav-links a{font-size:.94rem;font-weight:600;padding:9px 13px;border-radius:999px;color:var(--ink-soft);
  white-space:nowrap;transition:color .2s,background .2s}
.nav-links a.nav-opt{display:none} /* chỉ xuất hiện trong menu di động */
.nav-links a:hover{color:var(--ink);background:var(--glass-bg-light)}
.nav-links a.active{color:var(--ink);background:rgba(11,201,218,.12);
  box-shadow:inset 0 0 0 1px rgba(11,201,218,.3)}
.nav-cta{display:flex;align-items:center;gap:10px;flex:none}
.nav-cta .btn{padding:11px 20px;font-size:.92rem;white-space:nowrap}
.nav-close{display:none;width:44px;height:44px;border-radius:12px;place-items:center;
  background:var(--glass-bg-light);border:1px solid var(--glass-border-glow);
  color:var(--ink);cursor:pointer;flex:none}
.nav-close:hover{background:rgba(255,255,255,.12)}
.nav-toggle{display:none;width:44px;height:44px;border-radius:12px;background:var(--glass-bg-light);
  border:1px solid var(--glass-border);color:var(--ink);cursor:pointer;place-items:center}

/* ---------- Hero ---------- */
.hero{padding-top:clamp(38px,6vw,70px);padding-bottom:clamp(56px,8vw,96px)}
.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:clamp(32px,5vw,64px);align-items:center}
.hero h1{font-size:clamp(2.2rem,5.6vw,4rem);letter-spacing:-.03em;margin-bottom:.42em}
.hero-lead{font-size:clamp(1.02rem,1.9vw,1.2rem);color:var(--ink-soft);max-width:53ch}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin:30px 0 26px}
.hero-note{display:flex;align-items:center;gap:10px;font-size:.9rem;color:var(--ink-faint)}
.hero-note svg{flex:none;color:var(--seaweed-light)}

.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:clamp(44px,6vw,64px)}
.stat{background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--r-md);
  padding:20px 18px;text-align:center;backdrop-filter:var(--blur)}
.stat b{display:block;font-family:var(--font-title);font-size:clamp(1.5rem,3.4vw,2.05rem);
  line-height:1;color:var(--gold);margin-bottom:6px}
.stat span{font-size:.85rem;color:var(--ink-soft)}

/* ---------- Sứa mascot ---------- */
.hero-art{position:relative;display:grid;place-items:center;min-height:380px}
.orb{position:absolute;width:min(430px,88%);aspect-ratio:1;border-radius:50%;
  background:radial-gradient(circle at 38% 34%, rgba(11,201,218,.36), rgba(246,85,139,.16) 46%, transparent 70%);
  filter:blur(28px);animation:pulse 7s ease-in-out infinite}
@keyframes pulse{0%,100%{transform:scale(1);opacity:.85}50%{transform:scale(1.09);opacity:1}}
.jelly{position:relative;width:min(330px,80%);animation:drift 6.5s ease-in-out infinite}
@keyframes drift{0%,100%{transform:translateY(0) rotate(-1.5deg)}50%{transform:translateY(-22px) rotate(1.5deg)}}
.jelly .tentacle{animation:wave 3.4s ease-in-out infinite;transform-origin:top center}
.jelly .tentacle:nth-child(2){animation-delay:.25s}
.jelly .tentacle:nth-child(3){animation-delay:.5s}
.jelly .tentacle:nth-child(4){animation-delay:.75s}
.jelly .tentacle:nth-child(5){animation-delay:1s}
@keyframes wave{0%,100%{transform:rotate(-4deg)}50%{transform:rotate(4deg)}}

.float-chip{position:absolute;display:flex;align-items:center;gap:9px;
  background:rgba(6,26,75,.72);border:1px solid var(--glass-border-glow);
  padding:10px 16px;border-radius:999px;font-size:.86rem;font-weight:600;
  backdrop-filter:var(--blur);box-shadow:var(--shadow-card);animation:bob 5s ease-in-out infinite}
.float-chip i{font-style:normal;font-size:1.05rem}
.float-chip.c1{top:8%;left:-2%;animation-delay:.4s}
.float-chip.c2{bottom:16%;right:-4%;animation-delay:1.6s}
.float-chip.c3{bottom:2%;left:6%;animation-delay:2.6s}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-13px)}}

/* ---------- Dải tin cậy ---------- */
.trust{border-block:1px solid var(--glass-border);background:rgba(2,15,45,.4);padding-block:26px}
.trust-row{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:14px 34px;
  font-family:var(--font-title);font-weight:500;color:var(--ink-faint);font-size:.95rem}
.trust-row span{display:flex;align-items:center;gap:9px}
.trust-row i{font-style:normal;font-size:1.15rem}

/* ---------- Lưới thẻ ---------- */
.grid{display:grid;gap:clamp(16px,2.2vw,24px)}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}

.ico{width:52px;height:52px;border-radius:16px;display:grid;place-items:center;font-size:1.5rem;margin-bottom:16px;
  background:var(--glass-bg-light);border:1px solid var(--glass-border)}
.ico.cy{background:rgba(11,201,218,.14);border-color:rgba(11,201,218,.34)}
.ico.go{background:rgba(255,198,26,.14);border-color:rgba(255,198,26,.34)}
.ico.pk{background:rgba(246,85,139,.14);border-color:rgba(246,85,139,.34)}
.ico.gr{background:rgba(23,207,99,.14);border-color:rgba(23,207,99,.34)}
.ico.or{background:rgba(249,89,31,.14);border-color:rgba(249,89,31,.34)}
.ico.bl{background:rgba(20,129,184,.18);border-color:rgba(20,129,184,.38)}
.card h3{font-size:1.16rem;margin-bottom:.45em}
.card p{color:var(--ink-soft);font-size:.95rem;margin-bottom:0}

/* ---------- Chương trình theo độ tuổi ---------- */
.prog{display:flex;flex-direction:column}
.prog-top{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;margin-bottom:16px}
.age-pill{font-family:var(--font-title);font-weight:600;font-size:.8rem;padding:6px 13px;border-radius:999px;
  background:var(--glass-bg-light);border:1px solid var(--glass-border);color:var(--ink-soft);white-space:nowrap}
.prog h3{font-size:1.28rem;margin-bottom:.3em}
.prog .goal{color:var(--cyan);font-size:.88rem;font-weight:600;margin-bottom:14px}
.prog ul{display:grid;gap:9px;margin-top:auto;padding-top:6px}
.prog li{display:flex;gap:10px;font-size:.92rem;color:var(--ink-soft);line-height:1.55}
.prog li::before{content:"";flex:none;width:7px;height:7px;margin-top:8px;border-radius:50%;
  background:var(--cyan);box-shadow:0 0 10px rgba(11,201,218,.8)}
.prog-bar{height:4px;border-radius:99px;margin-bottom:20px;
  background:linear-gradient(90deg,var(--cyan),var(--coral-pink))}
.prog:nth-child(2) .prog-bar{background:linear-gradient(90deg,var(--seaweed-light),var(--cyan))}
.prog:nth-child(3) .prog-bar{background:linear-gradient(90deg,var(--gold),var(--starfish))}
.prog:nth-child(4) .prog-bar{background:linear-gradient(90deg,var(--coral-pink),var(--shell-pink))}

/* ---------- Ứng dụng Pipo ---------- */
.app-sec{position:relative}
.app-grid{display:grid;grid-template-columns:.95fr 1.05fr;gap:clamp(32px,5vw,60px);align-items:center}
.phone{position:relative;width:min(300px,84%);margin-inline:auto;aspect-ratio:9/18.5;
  border-radius:42px;padding:11px;background:linear-gradient(160deg,#123162,#061a3f);
  border:1px solid var(--glass-border-glow);box-shadow:var(--shadow-lift),var(--glow-cyan)}
.phone-screen{width:100%;height:100%;border-radius:32px;overflow:hidden;position:relative;
  background:linear-gradient(180deg,#0a4076,#041d49 55%,#010a1e);
  display:flex;flex-direction:column;gap:10px;padding:22px 16px}
.phone-screen::before{content:"";position:absolute;top:10px;left:50%;transform:translateX(-50%);
  width:82px;height:6px;border-radius:99px;background:rgba(255,255,255,.22)}
.ps-title{font-family:var(--font-title);font-size:.95rem;margin-top:16px}
.ps-sub{font-size:.7rem;color:var(--ink-faint);margin-bottom:6px}
.ps-row{display:flex;align-items:center;gap:9px;padding:10px;border-radius:14px;
  background:rgba(255,255,255,.07);border:1px solid var(--glass-border);font-size:.72rem;font-weight:600}
.ps-row i{font-style:normal;font-size:.95rem}
.ps-row b{margin-left:auto;color:var(--gold);font-family:var(--font-title);font-size:.72rem}
.ps-wave{margin-top:auto;display:flex;align-items:flex-end;gap:3px;height:44px;padding:0 2px}
.ps-wave span{flex:1;border-radius:99px;background:linear-gradient(180deg,var(--cyan),var(--sea-blue));
  animation:eq 1.1s ease-in-out infinite}
@keyframes eq{0%,100%{height:22%}50%{height:100%}}
.app-list{display:grid;gap:14px}
.app-item{display:flex;gap:15px;align-items:flex-start;padding:16px 18px;border-radius:var(--r-md);
  background:var(--glass-bg);border:1px solid var(--glass-border);backdrop-filter:var(--blur);
  transition:border-color .3s,transform .3s}
.app-item:hover{border-color:var(--glass-border-glow);transform:translateX(6px)}
.app-item i{font-style:normal;font-size:1.35rem;flex:none;width:42px;height:42px;border-radius:12px;
  display:grid;place-items:center;background:var(--glass-bg-light);border:1px solid var(--glass-border)}
.app-item h4{font-size:1rem;margin-bottom:.2em}
.app-item p{font-size:.88rem;color:var(--ink-soft);margin:0}

/* ---------- Lộ trình ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(16px,2.2vw,24px);position:relative}
.steps::before{content:"";position:absolute;top:34px;left:8%;right:8%;height:2px;
  background:linear-gradient(90deg,transparent,var(--glass-border-glow),var(--glass-border-glow),transparent)}
.step{position:relative;text-align:center;padding-top:0}
.step-num{width:68px;height:68px;margin:0 auto 18px;border-radius:50%;display:grid;place-items:center;
  font-family:var(--font-title);font-size:1.4rem;font-weight:700;color:var(--abyss);
  background:linear-gradient(140deg,var(--cyan),var(--sea-blue));box-shadow:var(--glow-cyan);
  border:4px solid var(--abyss);position:relative;z-index:1}
.step:nth-child(2) .step-num{background:linear-gradient(140deg,var(--seaweed-light),var(--seaweed))}
.step:nth-child(3) .step-num{background:linear-gradient(140deg,var(--gold),var(--starfish));box-shadow:var(--glow-gold)}
.step:nth-child(4) .step-num{background:linear-gradient(140deg,var(--shell-pink),var(--coral-pink))}
.step h3{font-size:1.08rem;margin-bottom:.4em}
.step p{font-size:.9rem;color:var(--ink-soft);margin:0}

/* ---------- Giáo viên ---------- */
.teacher{text-align:center}
.avatar{width:104px;height:104px;margin:0 auto 16px;border-radius:50%;display:grid;place-items:center;
  font-size:2.7rem;background:linear-gradient(150deg,rgba(11,201,218,.28),rgba(246,85,139,.22));
  border:2px solid var(--glass-border-glow)}
.teacher h3{font-size:1.1rem;margin-bottom:.15em}
.teacher .role{color:var(--gold);font-size:.85rem;font-weight:600;margin-bottom:10px}
.teacher p{font-size:.9rem}
.tags{display:flex;flex-wrap:wrap;gap:7px;justify-content:center;margin-top:14px}
.tag{font-size:.74rem;font-weight:600;padding:5px 11px;border-radius:999px;
  background:var(--glass-bg-light);border:1px solid var(--glass-border);color:var(--ink-soft)}

/* ---------- Cảm nhận ---------- */
.quote{display:flex;flex-direction:column}
.stars{color:var(--gold);letter-spacing:2px;margin-bottom:12px;font-size:.95rem}
.quote p{font-size:.98rem;color:var(--ink);line-height:1.72;flex:1}
.who{display:flex;align-items:center;gap:12px;margin-top:18px;padding-top:18px;border-top:1px solid var(--glass-border)}
.who .av{width:44px;height:44px;border-radius:50%;display:grid;place-items:center;font-size:1.3rem;
  background:var(--glass-bg-light);border:1px solid var(--glass-border);flex:none}
.who b{display:block;font-family:var(--font-title);font-size:.95rem;font-weight:600}
.who span{font-size:.8rem;color:var(--ink-faint)}

/* ---------- Học phí ---------- */
.fee-grid{display:grid;grid-template-columns:1.12fr .88fr;gap:clamp(18px,2.4vw,26px);align-items:stretch}
.fee-card{display:flex;flex-direction:column}
.fee-card h3{font-size:1.24rem;margin-bottom:.15em}
.fee-card .lead{font-size:.9rem;color:var(--ink-faint);margin-bottom:22px}
.fee-list{display:grid;grid-template-columns:1fr 1fr;gap:13px 22px;margin-bottom:4px}
.fee-list li{display:flex;gap:11px;font-size:.93rem;color:var(--ink-soft);line-height:1.55}
.fee-list li svg{flex:none;margin-top:4px;color:var(--seaweed-light)}
.fee-foot{margin-top:auto;padding-top:22px;border-top:1px solid var(--glass-border);
  font-size:.88rem;color:var(--ink-faint)}
.fee-side{background:linear-gradient(155deg,rgba(11,201,218,.13),rgba(6,26,75,.62) 52%,rgba(246,85,139,.13));
  border-color:var(--glass-border-glow)}
.policy{display:grid;gap:18px;margin-bottom:26px}
.policy li{display:flex;gap:14px;align-items:flex-start}
.policy i{font-style:normal;font-size:1.15rem;flex:none;width:40px;height:40px;border-radius:12px;
  display:grid;place-items:center;background:var(--glass-bg-light);border:1px solid var(--glass-border)}
.policy b{display:block;font-family:var(--font-title);font-size:.98rem;font-weight:600;margin-bottom:2px}
.policy span{font-size:.87rem;color:var(--ink-soft);line-height:1.55}
.fee-side .btn{width:100%;margin-top:auto}
.fee-hint{font-size:.8rem;color:var(--ink-faint);text-align:center;margin:12px 0 0}

/* ---------- FAQ ---------- */
.faq{display:grid;gap:12px;max-width:840px;margin-inline:auto}
details{background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--r-md);
  backdrop-filter:var(--blur);overflow:hidden;transition:border-color .3s}
details[open]{border-color:var(--glass-border-glow)}
summary{cursor:pointer;list-style:none;padding:19px 24px;display:flex;align-items:center;gap:16px;
  font-family:var(--font-title);font-weight:600;font-size:1.02rem}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";margin-left:auto;font-size:1.5rem;line-height:1;color:var(--cyan);
  transition:transform .3s;flex:none}
details[open] summary::after{transform:rotate(45deg)}
details .ans{padding:0 24px 22px;color:var(--ink-soft);font-size:.95rem}
details .ans p:last-child{margin-bottom:0}

/* ---------- CTA / Đăng ký ---------- */
.cta-box{position:relative;border-radius:var(--r-xl);padding:clamp(30px,4.5vw,58px);overflow:hidden;
  background:linear-gradient(140deg,rgba(11,201,218,.16),rgba(6,26,75,.72) 45%,rgba(246,85,139,.16));
  border:1px solid var(--glass-border-glow);box-shadow:var(--shadow-lift);backdrop-filter:var(--blur)}
.cta-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,4vw,52px);align-items:center;position:relative;z-index:1}
.cta-grid h2{font-size:clamp(1.7rem,3.6vw,2.4rem);letter-spacing:-.02em}
.cta-grid > div > p{color:var(--ink-soft)}
.cta-list{display:grid;gap:11px;margin-top:22px}
.cta-list li{display:flex;gap:11px;align-items:flex-start;font-size:.94rem;color:var(--ink-soft)}
.cta-list svg{flex:none;margin-top:3px;color:var(--gold)}

form{display:grid;gap:14px}
.field{display:grid;gap:7px}
.field label{font-size:.85rem;font-weight:600;color:var(--ink-soft)}
.field input,.field select,.field textarea{
  font-family:var(--font-body);font-size:.96rem;font-weight:500;color:var(--ink);
  background:rgba(1,10,30,.55);border:1px solid var(--glass-border);border-radius:14px;
  padding:13px 16px;width:100%;transition:border-color .25s,box-shadow .25s}
.field input::placeholder,.field textarea::placeholder{color:var(--ink-faint)}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none;border-color:var(--cyan);box-shadow:0 0 0 3px rgba(11,201,218,.18)}
.field select option{background:#041d49;color:var(--ink)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
form .btn{width:100%;margin-top:4px}
.form-note{font-size:.8rem;color:var(--ink-faint);text-align:center;margin:0}
.form-ok{display:none;padding:16px 18px;border-radius:14px;font-size:.92rem;font-weight:600;
  background:rgba(23,207,99,.12);border:1px solid rgba(23,207,99,.4);color:var(--seaweed-light)}
.form-ok.show{display:block}

/* ---------- Footer ---------- */
.site-footer{border-top:1px solid var(--glass-border);background:rgba(1,10,30,.6);padding-block:clamp(44px,6vw,68px) 26px}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.3fr;gap:clamp(26px,4vw,44px)}
.foot-grid h4{font-size:.82rem;letter-spacing:.14em;text-transform:uppercase;color:var(--cyan);margin-bottom:16px}
.foot-grid p{font-size:.9rem;color:var(--ink-soft)}
.foot-grid li{margin-bottom:10px}
.foot-grid li a{font-size:.9rem;color:var(--ink-soft);transition:color .2s}
.foot-grid li a:hover{color:var(--cyan)}
.socials{display:flex;gap:10px;margin-top:16px}
.socials a{width:40px;height:40px;border-radius:12px;display:grid;place-items:center;font-size:1.1rem;
  background:var(--glass-bg-light);border:1px solid var(--glass-border);transition:border-color .25s,transform .25s}
.socials a:hover{border-color:var(--glass-border-glow);transform:translateY(-3px)}
.foot-bottom{display:flex;flex-wrap:wrap;gap:12px 24px;justify-content:space-between;align-items:center;
  margin-top:clamp(32px,4vw,48px);padding-top:24px;border-top:1px solid var(--glass-border);
  font-size:.84rem;color:var(--ink-faint)}

/* ---------- Thanh CTA dính đáy (chỉ hiện trên điện thoại) ---------- */
.sticky-cta{position:fixed;left:0;right:0;bottom:0;z-index:70;display:none;gap:10px;padding:10px 14px;
  background:rgba(2,15,45,.94);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border-top:1px solid var(--glass-border)}
.sticky-cta .btn{flex:1;padding:13px 14px;font-size:.94rem;min-width:0}

/* ---------- Hiệu ứng cuộn ---------- */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s cubic-bezier(.2,.7,.3,1),transform .7s cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:none}

/* ---------- Responsive ---------- */
@media (max-width:1000px){
  .hero-grid,.app-grid,.cta-grid{grid-template-columns:1fr}
  .hero-art{order:-1;min-height:300px}
  .g4{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .steps::before{display:none}
  .fee-grid{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
}
/* Bớt nút phụ trước, sau đó mới chuyển hẳn sang menu di động.
   Menu có 6 mục nên ngưỡng cao hơn so với lúc chỉ có 5. */
@media (max-width:1240px){
  .nav-cta .btn-ghost{display:none}
}
/* ---------- Menu di động: ngăn kéo trượt từ bên trái ----------
   Header vẫn hiển thị; ngăn kéo mở ra ngay bên dưới header, nút
   hamburger đổi thành nút đóng tại chỗ. */
@media (max-width:1150px){
  :root{--drawer-w:min(360px,86vw)}

  .nav-toggle{display:grid}
  .site-header.open .nav-toggle{display:none}
  .site-header.open .nav-close{display:grid}

  .nav-drawer{
    display:flex;flex-direction:column;
    position:fixed;top:var(--header-h);left:0;bottom:0;width:var(--drawer-w);
    background:linear-gradient(170deg,#0a4076 0%,#041d49 52%,#010a1e 100%);
    border-right:1px solid var(--glass-border-glow);
    box-shadow:22px 0 60px rgba(1,10,30,.55);
    overflow-y:auto;overscroll-behavior:contain;
    transform:translate3d(-101%,0,0);visibility:hidden;
    backface-visibility:hidden;will-change:transform;
    transition:transform .28s cubic-bezier(.32,.72,.3,1),visibility 0s linear .28s;
    z-index:80;
  }
  .site-header.open .nav-drawer{
    transform:translate3d(0,0,0);visibility:visible;
    transition:transform .28s cubic-bezier(.32,.72,.3,1),visibility 0s;
  }

  .nav-links{
    display:flex;flex-direction:column;align-items:stretch;gap:2px;
    padding:14px 12px;
  }
  .nav-links a,.nav-links a.nav-opt{
    display:block;padding:15px 16px;font-size:1.04rem;border-radius:12px;
  }
  .nav-links a + a{border-top:1px solid rgba(255,255,255,.06)}
  .nav-links a.active{background:rgba(11,201,218,.14);box-shadow:inset 0 0 0 1px rgba(11,201,218,.32)}

  /* Thông tin liên hệ ở cuối ngăn kéo */
  .nav-drawer__foot{
    display:block;margin-top:auto;padding:20px 22px 26px;
    border-top:1px solid var(--glass-border);
  }
  .nav-drawer__foot h4{
    font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;
    color:var(--cyan);margin:0 0 14px;
  }
  .nav-drawer__foot a,.nav-drawer__foot p{
    display:flex;align-items:flex-start;gap:10px;margin:0 0 12px;
    font-size:.9rem;color:var(--ink-soft);line-height:1.5;
  }
  .nav-drawer__foot a{font-weight:600;color:var(--ink)}
  .nav-drawer__foot a:hover{color:var(--cyan)}
  .nav-drawer__foot i{font-style:normal;flex:none;font-size:.95rem;margin-top:1px}
  .nav-drawer__foot > :last-child{margin-bottom:0}

  /* Lớp phủ mờ phía sau, do site.js chèn vào */
  /* Không dùng backdrop-filter ở đây: làm mờ toàn màn hình buộc trình duyệt
     vẽ lại mọi thứ bên dưới ở từng khung hình — nguyên nhân chính gây giật
     trên điện thoại. Nền đục hơn cho hiệu quả thị giác tương đương. */
  .nav-backdrop{
    position:fixed;inset:0;background:rgba(1,10,30,.78);
    opacity:0;visibility:hidden;transition:opacity .26s ease,visibility 0s linear .26s;
    z-index:78;border:0;padding:0;
  }
  body.nav-open .nav-backdrop{opacity:1;visibility:visible;transition:opacity .3s,visibility 0s}

  /* Khi ngăn kéo mở: header nổi lên trên, khoá cuộn nền */
  body.nav-open{overflow:hidden}
  /* QUAN TRỌNG: khi ngăn kéo mở, header KHÔNG được có backdrop-filter.
     Thuộc tính đó tạo containing block mới cho phần tử position:fixed
     bên trong, khiến .nav-drawer bị tính theo hộp header (cao 64px)
     thay vì theo viewport — kết quả là ngăn kéo cao 0px, không thấy gì.
     Dùng nền đặc thay cho hiệu ứng mờ trong lúc mở. */
  body.nav-open .site-header{
    z-index:100;
    background:#03102e;
    backdrop-filter:none;-webkit-backdrop-filter:none;
    border-bottom-color:var(--glass-border);
  }
  body.nav-open .sticky-cta{display:none}

  /* Phía sau lớp phủ tối không ai nhìn thấy các lớp trang trí, nhưng trình
     duyệt vẫn phải vẽ chúng ở mọi khung hình. Tắt hẳn trong lúc mở để dành
     toàn bộ tài nguyên cho animation của ngăn kéo. */
  body.nav-open .sea-rays,
  body.nav-open .bubbles{visibility:hidden}
  body.nav-open .orb,
  body.nav-open .jelly,
  body.nav-open .jelly .tentacle,
  body.nav-open .float-chip,
  body.nav-open .ps-wave span{animation-play-state:paused}

  .g3,.g2{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
}

@media (max-width:1150px) and (prefers-reduced-motion:reduce){
  .nav-drawer,.nav-backdrop{transition:none}
}
/* Điện thoại: header chỉ còn logo + hamburger; nút kêu gọi chuyển xuống
   thanh dính ở đáy màn hình. Tagline co lại để khối logo không đẩy
   hamburger ra ngoài viewport. */
@media (max-width:600px){
  :root{--header-h:64px}
  .brand{font-size:1.2rem;gap:9px}
  .brand-mark{width:38px;height:38px;font-size:1.2rem;border-radius:12px}
  .brand small{font-size:.54rem;letter-spacing:.1em;margin-top:2px;max-width:52vw;white-space:nowrap}
  .nav-cta .btn-primary{display:none}
  .nav-toggle,.nav-close{width:42px;height:42px}
  .sticky-cta{display:flex}
  body{padding-bottom:70px}
}
@media (max-width:560px){
  .fee-list{grid-template-columns:1fr}
  .g4{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr}
  .float-chip.c1,.float-chip.c2{display:none}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition-duration:.01ms!important;scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
}

/* Chỉ dành cho trình đọc màn hình */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0 0 0 0);white-space:nowrap;border:0}