/* Hành Trình Bé Lớn — Concept Theme V2
   Visual language inspired by the approved preschool 3D mockup.
   Keeps existing one-page structure and app logic intact. */

:root{
  --c-sky:#66ccff;--c-sky2:#dff7ff;--c-cream:#fff9ee;--c-navy:#123f72;
  --c-green:#28b463;--c-orange:#ff7b2f;--c-pink:#ff5e9c;--c-blue:#2798ef;--c-purple:#8359e8;
  --c-yellow:#ffcf4f;--c-mint:#68d8b1;--c-white:#fff;
  --c-shadow:0 22px 55px rgba(38,92,128,.16);
  --c-shadow-soft:0 12px 30px rgba(38,92,128,.12);
}

html{background:#e9f8ff}
body{
  background:
    radial-gradient(circle at 10% 8%,rgba(255,255,255,.95) 0 80px,transparent 81px),
    radial-gradient(circle at 92% 10%,rgba(255,255,255,.85) 0 100px,transparent 101px),
    linear-gradient(180deg,#effbff 0%,#fff 35%,#fff8ef 67%,#eefaff 100%);
}

/* FLOATING NAV LIKE THE CONCEPT */
.nav{padding:12px 0 0;background:transparent;backdrop-filter:none}
.nav-in{
  height:64px;border-radius:24px;padding:0 18px;
  background:rgba(255,255,255,.96);
  border:2px solid rgba(255,255,255,.96);
  box-shadow:0 14px 36px rgba(31,95,136,.16);
}
.brand img{width:48px;height:48px;border-radius:14px;filter:drop-shadow(0 4px 6px rgba(43,93,119,.12))}
.brand b{font-size:20px;color:#17496e}
.brand small{color:#69859a;font-weight:800}
.links a{font-size:11px;font-weight:900;color:#284f72}
.links a:first-child{background:#fff4e8;color:#f36d23;box-shadow:inset 0 -3px 0 #ff944e}
.nav-open{border-radius:15px!important;box-shadow:0 8px 18px rgba(40,170,95,.22)!important}

/* HERO — more saturated, cinematic, candy-like */
.hero{
  min-height:850px;
  background-color:#6bcdf9;
  background-image:
    linear-gradient(180deg,rgba(255,255,255,0) 0 60%,rgba(255,255,255,.04) 74%,rgba(245,253,255,.98) 100%),
    url('./hero-city-3d.svg');
  background-position:center 70px,center 70px;
  background-size:cover,cover;
}
.hero:before{
  content:'';position:absolute;inset:70px 0 0;pointer-events:none;z-index:1;
  background:
    radial-gradient(ellipse at 50% 22%,rgba(255,255,255,.82) 0 13%,rgba(255,255,255,.42) 27%,transparent 48%),
    radial-gradient(circle at 12% 18%,rgba(255,247,183,.32) 0 45px,transparent 46px),
    radial-gradient(circle at 89% 16%,rgba(255,255,255,.26) 0 62px,transparent 63px);
}
.hero:after{height:155px;background:linear-gradient(0deg,#f5fbff 0%,rgba(245,251,255,.98) 30%,rgba(245,251,255,0) 100%)}
.hero-inner{padding-top:42px}
.hero-badge{
  font-size:10px;letter-spacing:.05em;padding:9px 18px;border-radius:999px;
  color:#227a4e;background:rgba(255,255,255,.96);box-shadow:0 10px 26px rgba(45,99,132,.15)
}
.hero-title{margin:12px 0 9px;filter:drop-shadow(0 10px 12px rgba(36,89,124,.18))}
.hero-title .journey{
  font-size:clamp(66px,7.8vw,106px);letter-spacing:-.035em;
  color:#12a34a;-webkit-text-stroke:4px #fff;
  text-shadow:0 4px 0 #087e35,0 8px 0 #fff,0 14px 24px rgba(31,87,118,.18)
}
.hero-title .big{font-size:clamp(82px,10.8vw,145px);-webkit-text-stroke:4px #fff;text-shadow:0 5px 0 rgba(255,255,255,.95),0 11px 16px rgba(42,90,121,.18)}
.hero-tag{
  position:relative;padding:10px 28px;border-radius:20px;font-size:14px;
  background:linear-gradient(180deg,#fff7d9,#ffe8b0);border:2px solid #fff3c6;
  color:#8d4f21;box-shadow:0 10px 23px rgba(128,91,39,.14)
}
.hero-tag:before,.hero-tag:after{content:'✦';position:absolute;top:50%;transform:translateY(-50%);color:#ffb936;font-size:17px}.hero-tag:before{left:-28px}.hero-tag:after{right:-28px}
.hero-desc{max-width:690px;font-size:13px;border-radius:20px;background:rgba(235,248,255,.78);border:1px solid rgba(255,255,255,.9);box-shadow:0 9px 22px rgba(35,84,116,.10)}
.hero-actions .btn{min-width:205px;min-height:52px;border-radius:999px;font-size:13px;border:2px solid rgba(255,255,255,.75)}
.hero-actions .btn-orange{background:linear-gradient(180deg,#ff9a34,#ff6e2c);box-shadow:0 13px 25px rgba(243,108,43,.32)}
.hero-actions .btn-white{background:#fff;color:#235687;box-shadow:0 13px 25px rgba(33,85,122,.18)}
.hero-kpis{
  width:min(1020px,91%);bottom:20px;border-radius:30px;padding:7px 6px;
  background:rgba(255,255,255,.97);border:2px solid rgba(255,255,255,.98);
  box-shadow:0 20px 45px rgba(34,85,118,.19)
}
.hero-kpi{padding:13px 16px 12px 64px}
.hero-kpi:before{left:18px;width:38px;height:38px;font-size:19px;box-shadow:inset 0 2px 0 #fff9,0 5px 12px rgba(40,84,111,.12)}
.hero-kpi b{font-size:23px;color:#174f80}.hero-kpi span{font-size:8px;color:#6b86a0}

/* CLOUD/WAVE TRANSITIONS */
.apphub,.workspace-section,.feature-section,.zones,.journey,.problem-section,.final{position:relative}
.apphub:before,.workspace-section:before,.feature-section:before,.zones:before,.journey:before,.problem-section:before{
  content:'';position:absolute;left:0;right:0;top:-20px;height:26px;pointer-events:none;
  background:radial-gradient(44px 24px at 44px 24px,#fff 98%,transparent 100%) repeat-x;background-size:88px 26px
}
.section{padding:70px 0}
.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 13px;border-radius:999px;background:#fff;border:1px solid #e5eef2;box-shadow:0 7px 17px rgba(45,86,111,.08);letter-spacing:.08em}
.eyebrow:before,.eyebrow:after{content:'★';color:#ffd24f;font-size:13px}
.section-title{font-size:clamp(35px,4.2vw,52px);color:#174b7b;text-shadow:0 2px 0 #fff;font-weight:800}
.lead{font-weight:700}

/* APP HUB — the biggest visual change */
.apphub{
  background:
    radial-gradient(circle at 8% 20%,rgba(255,225,239,.75),transparent 24%),
    radial-gradient(circle at 92% 20%,rgba(225,215,255,.7),transparent 24%),
    linear-gradient(180deg,#f8fcff,#fff 72%);
  overflow:hidden
}
.apphub .center:before{content:'⭐';font-size:28px;margin-right:10px;vertical-align:middle}.apphub .center:after{content:'⭐';font-size:28px;margin-left:10px;vertical-align:middle}
.apphub .section-title{
  display:inline-block;margin-top:12px;
  background:linear-gradient(90deg,#278ff3 0 18%,#42ba60 18% 38%,#ff9a36 38% 58%,#ff5f9e 58% 78%,#865ce8 78%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
  filter:drop-shadow(0 4px 0 #fff) drop-shadow(0 8px 10px rgba(42,87,119,.12));
}
.hub-grid{gap:18px;margin-top:34px}
.hub-card{
  position:relative;overflow:hidden;border-radius:34px;padding:16px 16px 18px;
  border:3px solid rgba(255,255,255,.96);box-shadow:0 20px 42px rgba(42,91,123,.15);
  transform:translateZ(0)
}
.hub-card:before{content:'';position:absolute;width:120px;height:120px;border-radius:50%;top:-52px;right:-38px;background:rgba(255,255,255,.45)}
.hub-card:nth-child(1){background:linear-gradient(180deg,#ffe1ec,#fff 72%)}
.hub-card:nth-child(2){background:linear-gradient(180deg,#dff2ff,#fff 72%)}
.hub-card:nth-child(3){background:linear-gradient(180deg,#e0f8e7,#fff 72%)}
.hub-card:nth-child(4){background:linear-gradient(180deg,#eee5ff,#fff 72%)}
.hub-visual{
  height:185px;border-radius:26px;margin-bottom:15px;font-size:90px;
  background:radial-gradient(circle at 50% 35%,#fff 0 24%,rgba(255,255,255,.55) 25% 52%,transparent 53%)!important;
  text-shadow:0 13px 20px rgba(50,82,103,.13)
}
.hub-visual:before,.hub-visual:after{position:absolute;color:#ffc735;font-size:25px}.hub-visual:before{content:'✦';left:22px;top:24px}.hub-visual:after{content:'★';right:24px;bottom:24px}
.hub-card h3{font-size:31px;line-height:1;margin-top:-2px;text-shadow:0 2px 0 #fff}
.hub-card p{font-size:11.5px;line-height:1.55;font-weight:700;color:#617c92}
.hub-card .btn{border-radius:999px;min-height:44px;font-size:11px;border:2px solid rgba(255,255,255,.85)}

/* WORKSPACE — child-friendly OS panel */
.workspace-section{
  background:
    radial-gradient(circle at 12% 12%,#ffe5f0 0 85px,transparent 86px),
    radial-gradient(circle at 90% 14%,#e8e0ff 0 95px,transparent 96px),
    linear-gradient(180deg,#fff9e9,#eaf8ff 70%,#fff)
}
.workspace-shell{
  border-radius:38px;border:4px solid #fff;box-shadow:0 25px 65px rgba(38,88,121,.18);overflow:hidden;
  background:linear-gradient(180deg,#fefefe,#f4fbff)
}
.workspace-top{padding:15px 16px;background:linear-gradient(180deg,#fff,#f2f9ff);border-bottom:2px solid #dcecf4}
.tabs{gap:9px}
.tab{min-height:42px;padding:9px 17px;border-radius:999px;border:2px solid #e0eaf0;font-size:11px;box-shadow:0 5px 12px rgba(40,77,104,.06)}
.tab.active{transform:translateY(-1px);box-shadow:0 8px 18px rgba(39,85,115,.12)}
.status{padding:8px 12px;border-radius:999px;background:#e8f9ed;border:1px solid #cbefd5}
.icon-btn{border-radius:14px;border:2px solid #dfeaf0;background:#fff}
.stage{background:linear-gradient(180deg,#e9f7ff,#f8fcff)}
.loader-box{border-radius:28px;padding:24px 32px;border:3px solid #fff;box-shadow:0 18px 40px rgba(44,84,111,.14)}
.may-panel{background:radial-gradient(circle at 15% 15%,#e7f9ff 0 180px,transparent 181px),linear-gradient(135deg,#f8fcff,#fff3fb)}
.may-card{border-radius:30px;border:3px solid #fff;box-shadow:0 15px 34px rgba(44,84,111,.11)}
.may-orb{border-radius:50%;border:5px solid #fff;box-shadow:0 15px 30px rgba(109,91,191,.22)}
.chatbox{border-radius:24px;background:#f4f9fc;border:2px solid #e1ebf1}
.bubble{border-radius:20px;font-weight:700}

/* FEATURE ECOSYSTEM — icon toy tiles */
.feature-section{background:linear-gradient(180deg,#fff,#f7fcff)}
.feature-grid{gap:14px;margin-top:30px}
.feature{
  position:relative;min-height:185px;border-radius:28px;padding:20px 14px 16px;
  background:linear-gradient(180deg,#fff,#f9fcff);border:3px solid #fff;box-shadow:0 14px 30px rgba(43,87,116,.10)
}
.feature:nth-child(1){background:linear-gradient(180deg,#fff0f5,#fff)}.feature:nth-child(2){background:linear-gradient(180deg,#e9f6ff,#fff)}.feature:nth-child(3){background:linear-gradient(180deg,#eaf9ee,#fff)}.feature:nth-child(4){background:linear-gradient(180deg,#fff3df,#fff)}.feature:nth-child(5){background:linear-gradient(180deg,#eeeaff,#fff)}.feature:nth-child(6){background:linear-gradient(180deg,#ffeaf2,#fff)}
.feature-icon{width:68px;height:68px;border-radius:22px;font-size:33px;background:#fff;border:2px solid #fff;box-shadow:0 10px 22px rgba(46,91,120,.12)}
.feature b{font-size:12px;color:#234e73}.feature p{font-size:9px;color:#688298;font-weight:700}

/* SKILL CITY CARDS — make them look like toy buildings */
.zones{
  overflow:hidden;background:
    linear-gradient(180deg,rgba(196,237,255,.3),rgba(255,255,255,.1)),
    linear-gradient(180deg,#e4f7ff,#f8fcff)
}
.zones:after{content:'';position:absolute;left:0;right:0;bottom:0;height:150px;background:linear-gradient(0deg,#def2d0,rgba(222,242,208,0));pointer-events:none}
.zone-grid{gap:13px;margin-top:32px;position:relative;z-index:2}
.zone{padding:11px;border-radius:26px;border:3px solid #fff;box-shadow:0 18px 32px rgba(43,89,119,.13);background:rgba(255,255,255,.92)}
.zone:hover{transform:translateY(-8px) scale(1.025)}
.zone-building{height:145px;border-radius:25px;border:6px solid #fff;box-shadow:inset 0 3px 0 rgba(255,255,255,.55),0 12px 22px rgba(42,86,115,.13);font-size:46px}
.zone-building:before{top:-18px;height:49px;width:76%;filter:drop-shadow(0 5px 5px rgba(40,84,110,.12))}
.zone b{font-size:19px}.zone span{font-size:8.5px;font-weight:800;color:#658096}

/* LEARNING JOURNEY — colorful arrow-like row */
.journey{background:linear-gradient(180deg,#fff8e7,#fffdf7)}
.journey-grid{gap:16px;margin-top:32px}
.step{border-radius:28px;border:3px solid #fff;box-shadow:0 14px 30px rgba(109,87,47,.10);padding:20px;min-height:175px}
.step:nth-child(1){background:linear-gradient(180deg,#eaf7ff,#fff)}.step:nth-child(2){background:linear-gradient(180deg,#fff0f5,#fff)}.step:nth-child(3){background:linear-gradient(180deg,#eaf9ee,#fff)}.step:nth-child(4){background:linear-gradient(180deg,#efe9ff,#fff)}
.step-no{width:50px;height:50px;font-size:21px;border:4px solid #fff;box-shadow:0 8px 16px rgba(50,88,112,.10)}
.step b{font-size:13px;color:#214e74}.step p{font-size:9.5px;font-weight:700;color:#6c8496}

/* PROBLEM / SOLUTION — more editorial and visual */
.problem-section{background:linear-gradient(180deg,#fff,#fff9ef)}
.problem-grid{gap:15px;margin-top:30px}
.problem-card{border-radius:28px;border:3px solid #fff;box-shadow:0 14px 30px rgba(75,89,102,.08);padding:20px;background:linear-gradient(180deg,#fff,#fbfdff)}
.problem-card:nth-child(1){background:linear-gradient(180deg,#fff3eb,#fff)}.problem-card:nth-child(2){background:linear-gradient(180deg,#fff8df,#fff)}.problem-card:nth-child(3){background:linear-gradient(180deg,#ffeaf1,#fff)}.problem-card:last-child{background:linear-gradient(135deg,#fff7b9,#e2ffd4)}
.problem-card .ico{font-size:38px}.problem-card b{font-size:13px;color:#274f70}.problem-card p{font-size:9.5px;font-weight:700}

/* FINAL CTA */
.final{background:linear-gradient(180deg,#eef9ff,#dff4ff)}
.final-box{position:relative;overflow:hidden;border:4px solid #fff;border-radius:36px;background:linear-gradient(135deg,#e5f8cf,#dff3ff 50%,#ffe9c9);box-shadow:0 22px 50px rgba(38,89,121,.15)}
.final-box:before{content:'🌱';position:absolute;right:170px;bottom:-22px;font-size:95px;opacity:.2}.final h2{font-size:38px;color:#195648}.final .btn{border-radius:999px;min-width:190px}
.footer{background:linear-gradient(135deg,#143c5b,#1b5375)}

/* MICRO ANIMATION */
@keyframes softFloat{50%{transform:translateY(-6px)}}
.hub-card:nth-child(1) .hub-visual,.hub-card:nth-child(4) .hub-visual{animation:softFloat 4s ease-in-out infinite}.hub-card:nth-child(2) .hub-visual,.hub-card:nth-child(3) .hub-visual{animation:softFloat 4.4s ease-in-out infinite reverse}

@media(max-width:1080px){
  .hero{min-height:790px}.hub-grid{gap:14px}.hub-visual{height:165px}.zone-building{height:132px}
}
@media(max-width:760px){
  .nav-in{height:58px}.hero{min-height:710px;background-position:center 58px,center 58px}.hero-title .journey{font-size:52px}.hero-title .big{font-size:70px}.hero-kpis{bottom:8px;border-radius:20px;padding:4px}.hero-kpi{padding:9px 8px 9px 45px}.hero-kpi:before{left:9px;width:30px;height:30px}.hub-card{border-radius:28px}.hub-visual{height:150px}.workspace-shell{border-radius:28px}.zone{border-radius:22px}.zone-building{height:120px;border-radius:20px}.section{padding:58px 0}
}
@media(max-width:480px){
  .hero{min-height:665px}.hero-title .journey{font-size:44px}.hero-title .big{font-size:60px}.hero-tag{font-size:10px}.hero-kpi b{font-size:16px}.hub-visual{height:135px;font-size:72px}.section-title{font-size:32px}.feature{min-height:160px}.final h2{font-size:30px}
}