/* BiBi Thiên Nga STEAM Preschool — Design System theo Brand Guideline
   Màu: #0B5D46 xanh đậm / #7AC943 xanh lá / #FFA726 cam vàng / #FFF8E6 kem / #FFFFFF trắng
   Font: Baloo 2 (tiêu đề) + Nunito (nội dung) — hỗ trợ tiếng Việt đầy đủ */
@import url('https://fonts.googleapis.com/css2?family=Baloo+2:wght@600;700;800&family=Nunito:wght@400;600;700;800&display=swap');

:root{
  --dark:#0B5D46; --dark2:#084734; --green:#7AC943; --orange:#FFA726; --orange2:#FF9800;
  --cream:#FFF8E6; --mint:#EEF7E8; --white:#FFFFFF; --ink:#1E332C; --muted:#5A6D66;
  --border:#D9E8DF; --error:#D64545;
  --shadow-card:0 4px 20px rgba(11,93,70,.08);
  --shadow-hover:0 12px 32px rgba(11,93,70,.14);
  --shadow-btn:0 6px 16px rgba(255,167,38,.35);
  --r-card:24px; --r-img:32px; --r-input:16px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Nunito',system-ui,sans-serif;font-size:17px;line-height:1.65;color:var(--ink);background:var(--white)}
img{max-width:100%;display:block}
a{color:var(--dark);text-decoration:none}
a:hover{color:var(--dark2)}
h1,h2,h3{font-family:'Baloo 2','Nunito',sans-serif;color:var(--dark);line-height:1.25;letter-spacing:-.01em}
h1{font-size:2.6rem;font-weight:800}
h2{font-size:2.1rem;font-weight:700;margin-bottom:1rem}
h3{font-size:1.45rem;font-weight:600;margin-bottom:.6rem}
p{margin-bottom:1rem}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
section{padding:72px 0}
.bg-cream{background:var(--cream)} .bg-mint{background:var(--mint)} .bg-dark{background:var(--dark);color:#fff}
.bg-dark h2,.bg-dark h3{color:#fff}
.lead{font-size:1.15rem}
.muted{color:var(--muted)}
.center{text-align:center}
.answer-first{font-size:1.12rem;background:var(--mint);border-left:6px solid var(--green);border-radius:0 var(--r-card) var(--r-card) 0;padding:20px 24px;margin-bottom:2rem}
.pending{display:inline-block;background:#FFF3CD;color:#7A5B00;border:1.5px dashed var(--orange);border-radius:999px;padding:2px 12px;font-size:.85rem;font-weight:700}
.note-pending{background:#FFF8E6;border:1.5px dashed var(--orange);border-radius:var(--r-card);padding:20px 24px;margin:1.5rem 0}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:800;font-size:1rem;
  padding:16px 32px;min-height:56px;border-radius:999px;border:2px solid transparent;cursor:pointer;transition:all .2s ease}
.btn-primary{background:var(--orange);color:var(--dark);box-shadow:var(--shadow-btn)}
.btn-primary:hover{background:var(--orange2);color:var(--dark);transform:translateY(-2px)}
.btn-secondary{background:var(--dark);color:#fff}
.btn-secondary:hover{background:var(--dark2);color:#fff;transform:translateY(-2px)}
.btn-ghost{background:transparent;border-color:var(--dark);color:var(--dark)}
.btn-ghost:hover{background:var(--mint);color:var(--dark)}

/* Topbar + Header */
.topbar{background:var(--dark);color:#fff;font-size:.9rem;padding:8px 0}
.topbar .container{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.topbar a{color:#fff;font-weight:700}
header.site{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.97);backdrop-filter:blur(6px);box-shadow:0 2px 16px rgba(11,93,70,.10)}
.header-in{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:10px 0}
.logo img{height:58px;width:auto}
nav.main{display:flex;gap:4px;align-items:center}
nav.main a{font-weight:700;padding:10px 12px;border-radius:999px}
nav.main a:hover{background:var(--mint)}
.burger{display:none;background:none;border:none;font-size:1.8rem;color:var(--dark);cursor:pointer;min-width:48px;min-height:48px}
@media(max-width:1023px){
  nav.main{display:none;position:absolute;top:100%;left:0;right:0;background:var(--cream);flex-direction:column;align-items:stretch;padding:16px 24px 24px;box-shadow:var(--shadow-hover)}
  nav.main.open{display:flex}
  nav.main a{padding:14px 12px;font-size:1.05rem}
  .burger{display:block}
  .header-cta{display:none}
}

/* Hero */
.hero{background:var(--cream);padding:56px 0 72px;position:relative;overflow:hidden}
.hero .container{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center}
.hero-badge{display:inline-block;background:#fff;border:2px solid var(--green);color:var(--dark);font-weight:800;border-radius:999px;padding:6px 16px;margin-bottom:16px;font-size:.92rem}
.hero-art{background:var(--mint);border-radius:var(--r-img);min-height:340px;display:flex;align-items:center;justify-content:center;padding:32px;position:relative}
.hero-art .star{position:absolute;font-size:2rem}
.hero-ctas{display:flex;gap:14px;flex-wrap:wrap;margin-top:24px}
.trust-points{display:flex;gap:18px;flex-wrap:wrap;margin-top:22px;font-weight:700;color:var(--dark);font-size:.95rem}
@media(max-width:860px){.hero .container{grid-template-columns:1fr} h1{font-size:2rem} h2{font-size:1.6rem} section{padding:48px 0}}

/* Cards & grids */
.grid{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,1fr)} .grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)} .grid-5{grid-template-columns:repeat(5,1fr)}
@media(max-width:1023px){.grid-4,.grid-5{grid-template-columns:repeat(2,1fr)} .grid-3{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.grid-2,.grid-3,.grid-4,.grid-5{grid-template-columns:1fr}}
.card{background:#fff;border:1px solid var(--border);border-radius:var(--r-card);padding:28px;box-shadow:var(--shadow-card);transition:all .2s ease}
.card:hover{box-shadow:var(--shadow-hover);transform:translateY(-4px)}
.card .icon-wrap{width:72px;height:72px;border-radius:50%;background:var(--mint);display:flex;align-items:center;justify-content:center;font-size:2rem;margin-bottom:16px}
.card .price{font-family:'Baloo 2';font-size:1.3rem;color:var(--dark)}
.tag{display:inline-block;background:var(--mint);color:var(--dark);font-weight:800;font-size:.8rem;border-radius:999px;padding:3px 12px;margin-bottom:10px}
.tag-orange{background:var(--orange);color:var(--dark)}

/* Timeline */
.timeline{display:grid;gap:0}
.timeline-item{display:grid;grid-template-columns:110px 1fr;gap:20px;padding:16px 0;border-bottom:2px dashed var(--border)}
.timeline-item .time{font-family:'Baloo 2';font-weight:700;color:var(--dark);font-size:1.1rem}
@media(max-width:640px){.timeline-item{grid-template-columns:84px 1fr}}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:20px}
@media(max-width:1023px){.steps{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.steps{grid-template-columns:1fr}}
.step{text-align:center;padding:24px 16px}
.step .num{width:56px;height:56px;border-radius:50%;background:var(--orange);color:var(--dark);font-family:'Baloo 2';font-weight:800;font-size:1.4rem;display:flex;align-items:center;justify-content:center;margin:0 auto 14px}

/* Table */
table.fee{width:100%;border-collapse:separate;border-spacing:0;background:#fff;border-radius:var(--r-card);overflow:hidden;box-shadow:var(--shadow-card);margin:1rem 0 2rem}
table.fee th{background:var(--dark);color:#fff;text-align:left;padding:16px 20px;font-family:'Baloo 2'}
table.fee td{padding:14px 20px;border-bottom:1px solid var(--border)}
@media(max-width:640px){table.fee,table.fee tbody,table.fee tr,table.fee td{display:block;width:100%} table.fee thead{display:none} table.fee td{border-bottom:1px solid var(--border)}}

/* FAQ */
.faq-item{background:#fff;border:1px solid var(--border);border-radius:var(--r-card);margin-bottom:14px;overflow:hidden}
.faq-q{width:100%;background:none;border:none;text-align:left;font-family:'Nunito';font-weight:800;font-size:1.05rem;color:var(--dark);padding:20px 24px;cursor:pointer;display:flex;justify-content:space-between;gap:12px;min-height:56px;align-items:center}
.faq-a{padding:0 24px 20px;display:none}
.faq-item.open .faq-a{display:block}
.faq-q .arr{color:var(--orange);font-size:1.3rem}

/* Forms */
form.lead-form{background:#fff;border-radius:var(--r-img);box-shadow:var(--shadow-hover);padding:32px}
.field{margin-bottom:18px}
.field label{display:block;font-weight:800;color:var(--dark);font-size:.95rem;margin-bottom:8px}
.field input,.field select,.field textarea{width:100%;min-height:56px;border:1.5px solid var(--border);border-radius:var(--r-input);padding:12px 20px;font-family:'Nunito';font-size:16px;background:#fff;color:var(--ink)}
.field textarea{min-height:96px;resize:vertical}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--green);box-shadow:0 0 0 4px rgba(122,201,67,.20)}
.field .err{display:none;color:var(--error);font-size:.85rem;margin-top:6px;font-weight:700}
.field.invalid input,.field.invalid select{border-color:var(--error)}
.field.invalid .err{display:block}
.form-privacy{font-size:.85rem;color:var(--muted);margin-top:12px}
.checkbox{display:flex;gap:10px;align-items:flex-start;font-size:.92rem}
.checkbox input{width:22px;height:22px;min-height:22px;flex:none;margin-top:2px}

/* Banner page con */
.page-banner{background:var(--cream);padding:44px 0}
.breadcrumb{font-size:.9rem;color:var(--muted);margin-bottom:10px}
.breadcrumb a{color:var(--muted)}

/* Menu tabs (thực đơn) */
.day-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:24px}
.day-tab{border:2px solid var(--dark);background:#fff;color:var(--dark);font-weight:800;border-radius:999px;padding:12px 22px;cursor:pointer;min-height:48px;font-family:'Nunito';font-size:1rem}
.day-tab.active{background:var(--dark);color:#fff}
.day-panel{display:none}.day-panel.active{display:block}

/* Gallery */
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
@media(max-width:860px){.gallery{grid-template-columns:repeat(2,1fr)}}
@media(max-width:540px){.gallery{grid-template-columns:1fr}}
.gallery figure{border-radius:var(--r-card);overflow:hidden;box-shadow:var(--shadow-card);cursor:pointer}
.gallery .ph{min-height:190px;display:flex;align-items:center;justify-content:center;font-size:3rem}
.gallery figcaption{padding:14px 18px;font-weight:700;color:var(--dark);background:#fff}
.lightbox{display:none;position:fixed;inset:0;background:rgba(11,40,32,.92);z-index:200;align-items:center;justify-content:center;padding:24px}
.lightbox.open{display:flex}
.lightbox .box{background:#fff;border-radius:var(--r-img);max-width:640px;width:100%;padding:36px;text-align:center}
.lightbox button{margin-top:16px}

/* Footer */
footer.site{background:var(--dark);color:#FFF8E6;padding:64px 0 110px}
footer.site a{color:#FFF8E6} footer.site a:hover{color:var(--orange)}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:32px}
@media(max-width:860px){.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:540px){.footer-grid{grid-template-columns:1fr}}
footer.site h3{color:#fff;font-size:1.15rem;margin-bottom:14px}
footer.site ul{list-style:none} footer.site li{margin-bottom:9px}
.footer-logo{background:#fff;border-radius:20px;padding:12px;display:inline-block;margin-bottom:16px}
.footer-logo img{height:64px;width:auto}
.copyright{border-top:1px solid rgba(255,248,230,.25);margin-top:40px;padding-top:20px;font-size:.9rem}

/* Sticky mobile CTA */
.sticky-cta{display:none}
@media(max-width:767px){
  .sticky-cta{display:grid;grid-template-columns:1fr 1fr 1.2fr;position:fixed;left:0;right:0;bottom:0;z-index:90;background:#fff;box-shadow:0 -4px 20px rgba(11,93,70,.16);padding:8px 8px calc(8px + env(safe-area-inset-bottom));gap:8px}
  .sticky-cta a{display:flex;align-items:center;justify-content:center;min-height:52px;border-radius:999px;font-weight:800;font-size:.92rem;text-align:center}
  .sticky-cta .call{background:var(--dark);color:#fff}
  .sticky-cta .zalo{background:#fff;border:2px solid var(--dark);color:var(--dark)}
  .sticky-cta .reg{background:var(--orange);color:var(--dark)}
  body{padding-bottom:76px}
}
.zalo-float{position:fixed;right:16px;bottom:92px;z-index:89;width:56px;height:56px;border-radius:50%;background:var(--green);color:#fff;display:none;align-items:center;justify-content:center;font-weight:800;box-shadow:var(--shadow-hover);font-size:.8rem}
@media(min-width:768px){.zalo-float{display:flex;bottom:24px}}

/* Modal form */
.modal{display:none;position:fixed;inset:0;background:rgba(11,40,32,.7);z-index:150;overflow:auto;padding:20px}
.modal.open{display:block}
.modal .sheet{max-width:560px;margin:30px auto}
.modal .close{float:right;background:var(--cream);border:none;width:48px;height:48px;border-radius:50%;font-size:1.3rem;cursor:pointer;color:var(--dark)}

/* Reveal */
.reveal{opacity:0;transform:translateY(16px);transition:all .4s ease-out}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none} html{scroll-behavior:auto}}
:focus-visible{outline:3px solid var(--orange);outline-offset:2px}
.star-deco{color:var(--orange)}
.check-list{list-style:none}
.check-list li{padding-left:34px;position:relative;margin-bottom:12px}
.check-list li::before{content:"✓";position:absolute;left:0;top:0;width:24px;height:24px;border-radius:50%;background:var(--green);color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;font-size:.85rem}
.searchbar{display:flex;gap:10px;max-width:640px}
.searchbar input{flex:1;min-height:56px;border:1.5px solid var(--border);border-radius:999px;padding:0 24px;font-size:16px;font-family:'Nunito'}

/* --- Bản demo có ảnh (v2): hero ảnh thật, card ảnh, gallery, sóng trang trí --- */
.hero{background:linear-gradient(180deg,#FFF8E6 0%,#FFF1CF 100%);padding:56px 0 0}
.hero-art{background:transparent;padding:0;min-height:0;display:block}
.hero-photo{position:relative;margin:0}
.hero-photo img{width:100%;border-radius:32px;border:6px solid #fff;box-shadow:0 18px 44px rgba(11,93,70,.22);aspect-ratio:4/3;object-fit:cover}
.hero-chip{position:absolute;background:#fff;color:var(--dark);font-weight:800;font-size:.92rem;border-radius:999px;padding:8px 16px;box-shadow:0 8px 22px rgba(11,93,70,.18)}
.hero-chip.chip-a{top:16px;left:-8px}
.hero-chip.chip-b{bottom:16px;right:-6px}
.hero .wave{display:block;width:calc(100% + 2px);height:54px;margin-top:34px}
.demo-note{text-align:center;color:var(--muted);font-size:.88rem;margin-top:12px}
.card-img{padding:0;overflow:hidden}
.card-img>img{width:100%;height:190px;object-fit:cover;display:block}
.card-img .card-body{padding:20px 24px 26px}
.gallery img{width:100%;height:215px;object-fit:cover;display:block;transition:transform .45s ease}
.gallery figure:hover img{transform:scale(1.05)}
.about-photo{position:relative;margin:0}
.about-photo img{width:100%;border-radius:32px;box-shadow:0 16px 38px rgba(11,93,70,.16);aspect-ratio:4/3;object-fit:cover}
.page-hero-img{margin:0 0 26px}
.page-hero-img img{width:100%;height:300px;object-fit:cover;border-radius:28px;box-shadow:0 12px 30px rgba(11,93,70,.14)}
@media(max-width:640px){.page-hero-img img{height:200px}.hero-chip{font-size:.8rem;padding:6px 12px}.gallery img{height:190px}}