:root{
  --navy:#0A2647;
  --blue:#1C4E9C;
  --sky:#4FA3E3;
  --ice:#F4F8FC;
  --ink:#132238;
  --muted:#5C6B82;
  --line:#DCE6F2;
  --white:#ffffff;
  --green:#1E9E6B;
  --red:#C8483A;
}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{font-family:'Inter',sans-serif;color:var(--ink);background:var(--white);line-height:1.6;-webkit-font-smoothing:antialiased;}
h1,h2,h3,h4{font-family:'Sora',sans-serif;color:var(--navy);line-height:1.2;}
a{text-decoration:none;color:inherit;}
img{max-width:100%;display:block;}
.wrap{max-width:1180px;margin:0 auto;padding:0 32px;}
section{scroll-margin-top:84px;}
.eyebrow{font-size:14px;color:var(--sky);font-weight:600;margin-bottom:10px;}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;border-radius:6px;font-weight:600;font-size:15px;border:1.5px solid transparent;cursor:pointer;transition:transform .15s ease, box-shadow .15s ease;font-family:'Inter',sans-serif;}
.btn:hover{transform:translateY(-1px);}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 8px 20px -8px rgba(28,78,156,.55);}
.btn-primary:hover{box-shadow:0 12px 24px -8px rgba(28,78,156,.65);}
.btn-outline{border-color:var(--line);color:var(--navy);background:#fff;}
.btn-outline:hover{border-color:var(--blue);color:var(--blue);}
.btn-ghost{color:var(--navy);}
.btn-danger{background:var(--red);color:#fff;}
.btn-sm{padding:8px 16px;font-size:13px;}

/* HEADER */
header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);}
.nav{display:flex;align-items:center;justify-content:space-between;height:76px;}
.brand{display:flex;align-items:center;gap:10px;font-family:'Sora',sans-serif;font-weight:700;font-size:19px;color:var(--navy);}
.brand img{height:32px;width:auto;}
.nav-links{display:flex;align-items:center;gap:32px;}
.nav-links a{font-size:15px;font-weight:500;color:var(--ink);padding:6px 0;border-bottom:2px solid transparent;transition:border-color .15s, color .15s;}
.nav-links a:hover,.nav-links a.active{color:var(--blue);border-color:var(--sky);}
.nav-actions{display:flex;align-items:center;gap:14px;}
.nav-actions .btn{padding:10px 20px;font-size:14px;}
.hi-user{font-size:14px;color:var(--muted);}
.menu-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:4px;}
.menu-toggle span{width:24px;height:2px;background:var(--navy);border-radius:2px;}

/* FLASH */
.flash{padding:14px 0;font-size:14.5px;font-weight:500;}
.flash-success{background:#E7F7EF;color:var(--green);}
.flash-error{background:#FBEAE8;color:var(--red);}

/* HERO */
.hero{background:linear-gradient(180deg,#F4F8FC 0%, #FFFFFF 78%);padding:88px 0 70px;overflow:hidden;position:relative;}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;}
.hero h1{font-size:46px;font-weight:700;letter-spacing:-.015em;margin-bottom:22px;}
.hero h1 .accent{color:var(--blue);}
.hero p.lead{font-size:17px;color:var(--muted);max-width:480px;margin-bottom:32px;}
.hero-cta{display:flex;gap:14px;margin-bottom:42px;flex-wrap:wrap;}
.hero-stats{display:flex;gap:36px;padding-top:28px;border-top:1px solid var(--line);}
.hero-stats div strong{display:block;font-family:'Sora',sans-serif;font-size:26px;color:var(--navy);}
.hero-stats div span{font-size:13px;color:var(--muted);}
.hero-visual svg{width:100%;height:auto;}

/* PAGE HEAD (cho các trang con) */
.page-head{background:var(--ice);padding:64px 0 48px;border-bottom:1px solid var(--line);}
.page-head h1{font-size:34px;margin-bottom:12px;}
.page-head p{color:var(--muted);max-width:560px;}

/* SECTION HEADS */
.section-head{max-width:620px;margin-bottom:52px;}
.section-head h2{font-size:32px;font-weight:700;letter-spacing:-.01em;margin-bottom:14px;}
.section-head p{color:var(--muted);font-size:16px;}

/* PRODUCTS */
#san-pham, .products-page{padding:80px 0 100px;}
.product-row{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center;padding:56px 0;border-top:1px solid var(--line);}
.product-row:first-of-type{border-top:none;}
.product-row.reverse .p-media{order:2;}
.p-tag{display:inline-block;font-size:12px;font-weight:700;color:var(--blue);background:#EAF1FC;padding:5px 12px;border-radius:5px;margin-bottom:16px;letter-spacing:.02em;}
.p-media{aspect-ratio:4/3;border-radius:10px;background:linear-gradient(135deg,var(--navy),var(--blue));position:relative;overflow:hidden;}
.p-media svg{position:absolute;inset:0;width:100%;height:100%;}
.product-row h3{font-size:24px;margin-bottom:14px;}
.product-row p{color:var(--muted);margin-bottom:20px;font-size:15px;}
.p-list{list-style:none;margin-bottom:22px;}
.p-list li{display:flex;gap:10px;font-size:14px;color:var(--ink);margin-bottom:9px;}
.p-list li::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--sky);margin-top:7px;flex-shrink:0;}
.p-link{color:var(--blue);font-weight:600;font-size:14px;}
.p-link::after{content:" →";}
.empty-note{color:var(--muted);padding:40px 0;text-align:center;}

/* PRICING */
#bao-gia, .pricing-page{padding:80px 0 100px;background:var(--ice);}
.pricing-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.price-card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:36px 30px;display:flex;flex-direction:column;position:relative;}
.price-card.featured{border:2px solid var(--blue);box-shadow:0 20px 40px -18px rgba(28,78,156,.35);}
.price-badge{position:absolute;top:-13px;left:30px;background:var(--blue);color:#fff;font-size:12px;font-weight:700;padding:4px 12px;border-radius:5px;}
.price-card h3{font-size:19px;margin-bottom:6px;}
.price-card .p-desc{font-size:13.5px;color:var(--muted);margin-bottom:22px;}
.price-amount{display:flex;align-items:baseline;gap:6px;margin-bottom:26px;}
.price-amount strong{font-family:'Sora',sans-serif;font-size:34px;color:var(--navy);}
.price-amount span{font-size:13px;color:var(--muted);}
.price-card ul{list-style:none;margin-bottom:28px;flex:1;}
.price-card ul li{display:flex;gap:10px;font-size:14px;padding:8px 0;border-top:1px solid var(--line);color:var(--ink);}
.price-card ul li:first-child{border-top:none;}
.price-card ul li::before{content:"✓";color:var(--sky);font-weight:700;}
.price-card .btn{width:100%;justify-content:center;}
.price-note{text-align:center;color:var(--muted);font-size:13.5px;margin-top:32px;}

/* AUTH FORMS (đăng ký / đăng nhập / tài khoản) */
.auth-section{padding:90px 0;}
.auth-wrap{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--line);border-radius:14px;overflow:hidden;max-width:980px;margin:0 auto;}
.auth-info{background:var(--navy);color:#fff;padding:56px 48px;position:relative;overflow:hidden;}
.auth-info h2{color:#fff;font-size:26px;margin-bottom:16px;}
.auth-info p{color:#B9C7DD;font-size:15px;margin-bottom:28px;max-width:360px;}
.auth-info ul{list-style:none;}
.auth-info li{display:flex;gap:10px;font-size:14px;color:#DCE6F5;margin-bottom:12px;}
.auth-info li::before{content:"—";color:var(--sky);}
.auth-form{padding:56px 48px;background:#fff;}
.field{margin-bottom:18px;}
.field label{display:block;font-size:13.5px;font-weight:600;color:var(--navy);margin-bottom:7px;}
.field input,.field textarea,.field select{width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:7px;font-family:'Inter',sans-serif;font-size:14.5px;color:var(--ink);transition:border-color .15s;}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--blue);}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.field-error{color:var(--red);font-size:12.5px;margin-top:6px;}
.auth-form .btn{width:100%;justify-content:center;margin-top:6px;}
.form-foot{text-align:center;font-size:13.5px;color:var(--muted);margin-top:18px;}
.form-foot a{color:var(--blue);font-weight:600;}
.remember-row{display:flex;justify-content:space-between;align-items:center;font-size:13.5px;color:var(--muted);margin-bottom:22px;}
.remember-row a{color:var(--blue);font-weight:600;}
#dang-nhap-wrap{grid-template-columns:.9fr 1.1fr;}
#dang-nhap-wrap .auth-info{order:2;}
#dang-nhap-wrap .auth-form{order:1;}

/* TÀI KHOẢN */
.account-card{max-width:640px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:12px;padding:40px;}
.account-row{display:flex;justify-content:space-between;padding:14px 0;border-top:1px solid var(--line);font-size:14.5px;}
.account-row:first-child{border-top:none;}
.account-row span:first-child{color:var(--muted);}
.account-row span:last-child{font-weight:600;color:var(--navy);}
.role-badge{display:inline-block;font-size:12px;font-weight:700;padding:3px 10px;border-radius:5px;background:#EAF1FC;color:var(--blue);}

/* FOOTER */
footer{background:var(--navy);color:#B9C7DD;padding:64px 0 28px;}
.footer-top{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:40px;margin-bottom:48px;}
.footer-brand .brand{color:#fff;margin-bottom:14px;}
.footer-brand p{font-size:14px;color:#8FA2C0;max-width:280px;margin-bottom:18px;}
.footer-col h4{color:#fff;font-size:14px;margin-bottom:16px;}
.footer-col ul{list-style:none;}
.footer-col li{margin-bottom:10px;font-size:14px;}
.footer-col a:hover{color:#fff;}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding-top:24px;display:flex;justify-content:space-between;font-size:13px;color:#8FA2C0;flex-wrap:wrap;gap:10px;}

@media (max-width:900px){
  .nav-links{display:none;}
  .menu-toggle{display:flex;}
  .hero .wrap{grid-template-columns:1fr;}
  .hero-visual{order:-1;max-width:340px;margin:0 auto;}
  .product-row, .product-row.reverse{grid-template-columns:1fr;}
  .product-row.reverse .p-media{order:0;}
  .pricing-grid{grid-template-columns:1fr;}
  .auth-wrap, #dang-nhap-wrap{grid-template-columns:1fr;}
  #dang-nhap-wrap .auth-info, #dang-nhap-wrap .auth-form{order:0;}
  .footer-top{grid-template-columns:1fr 1fr;}
  .field-row{grid-template-columns:1fr;}
  .hero h1{font-size:34px;}
}