/* Định hình lại khung chứa ảnh (nếu chưa có) */
.rel-card .rel-icon {
    width: 100px;          /* Chiều rộng của ô chứa ảnh */
    height: 100px;         /* Chiều cao của ô chứa ảnh */
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;     /* Ẩn phần ảnh bị thừa ra ngoài */
    border-radius: 4px;   /* Bo góc nhẹ cho khung nếu muốn */
}

/* Cấu hình cho chính file ảnh .jpg */
.rel-card .prod-thumb {
    width: 100%;
    height: 100%;
    object-fit: cover;    /* Giúp ảnh tự lấp đầy khung mà không bị móp méo, kéo giãn */
}

h1 {
  font-size: 40px;
  color: var(--heading-color);
  font-family: var(--heading-font);
}

:root{
  --navy:#0D2214;--steel:#1A3D22;--sky:#2E7D32;
  --green:#7CB342;--lime:#A5D65A;
  --cream:#F2F7F2;--white:#fff;--gray:#4A6048;
  --border:rgba(13,34,20,.1);--border-l:rgba(255,255,255,.1);
  --tr:.32s cubic-bezier(.4,0,.2,1);
  --radius:6px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'DM Sans',sans-serif;background:var(--cream);color:var(--navy);overflow-x:hidden}
/* LANG */
[data-lang]{display:none}
body.lang-en [data-lang="en"],body.lang-vi [data-lang="vi"]{display:inline}
body.lang-en [data-lang-block="en"],body.lang-vi [data-lang-block="vi"]{display:block}
[data-lang-block]{display:none}
/* NAV */
nav{position:fixed;top:0;left:0;right:0;z-index:200;display:flex;align-items:center;
  justify-content:space-between;padding:0 48px;height:72px;
  background:rgba(13,34,20,.97);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border-l);transition:var(--tr)}
nav.scrolled{background:rgba(13,34,20,.99);box-shadow:0 2px 20px rgba(0,0,0,.3)}
.nav-logo{font-family:'Roboto',serif;font-size:1.5rem;color:#fff;text-decoration:none;flex-shrink:0}
.nav-logo span{color:var(--green)}
.nav-links{display:flex;gap:4px;list-style:none;align-items:center}
.nav-links > li{position:relative}
.nav-links a{display:block;padding:6px 12px;font-size:.78rem;font-weight:500;letter-spacing:.06em;
  text-transform:uppercase;color:rgba(255,255,255,.7);text-decoration:none;
  transition:color var(--tr);border-radius:3px;white-space:nowrap}
.nav-links a:hover,.nav-links a.active{color:#fff;background:rgba(255,255,255,.07)}
.caret{font-size:.6rem;opacity:.6;margin-left:2px}
/* DROPDOWN */
.dropdown{display:none;position:absolute;top:calc(100% + 8px);left:0;
  background:rgba(13,34,20,.98);border:1px solid var(--border-l);border-radius:var(--radius);
  min-width:220px;padding:8px 0;box-shadow:0 12px 40px rgba(0,0,0,.4);z-index:300}
.has-drop:hover .dropdown{display:block}
.dropdown li{list-style:none}
.dropdown a{font-size:.78rem;padding:9px 18px;color:rgba(255,255,255,.65);
  text-transform:none;letter-spacing:.02em;border-radius:0}
.dropdown a:hover{color:#fff;background:rgba(124,179,66,.15)}
/* NAV RIGHT */
.nav-right{display:flex;align-items:center;gap:12px;flex-shrink:0}
.lang-btn{display:flex;background:rgba(255,255,255,.07);border-radius:20px;overflow:hidden;border:1px solid var(--border-l)}
.lang-btn button{padding:4px 12px;font-size:.7rem;font-weight:700;border:none;cursor:pointer;
  background:transparent;color:rgba(255,255,255,.4);transition:all var(--tr);font-family:'Space Mono',monospace}
.lang-btn button.active{background:var(--green);color:#fff}
.btn-cta{padding:8px 20px;background:var(--green);color:#fff;font-size:.76rem;font-weight:700;
  letter-spacing:.06em;text-transform:uppercase;border:none;cursor:pointer;border-radius:3px;
  text-decoration:none;transition:all var(--tr);white-space:nowrap}
.btn-cta:hover{background:#8bc34a;transform:translateY(-1px)}
.hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:4px}
.hamburger span{width:22px;height:2px;background:#fff;transition:var(--tr);display:block}
/* PAGE HERO */
.page-hero{padding:136px 48px 72px;background:var(--navy);position:relative;overflow:hidden}
.page-hero::before { content: ''; position: absolute; inset: 0; background: transparent; /* Đã loại bỏ đốm màu xanh, nền sẽ hiển thị theo màu của .page-hero */ }
.page-hero-lines{position:absolute;inset:0;pointer-events:none;opacity:.6}
.container{max-width:1180px;margin:0 auto;position:relative;z-index:2}
.breadcrumb{font-family:'Space Mono',monospace;font-size:.6rem;letter-spacing:.12em;
  color:rgba(255,255,255,.3);margin-bottom:16px;text-transform:uppercase}
.breadcrumb a{color:var(--green);text-decoration:none}
.breadcrumb a:hover{text-decoration:underline}
.page-hero h1{font-family:'Roboto',serif;font-size:clamp(1.8rem,3.5vw,2.8rem);
  color:#fff;line-height:1.1;max-width:700px}
.page-hero h1 em{font-style:italic;color:var(--green)}
.page-hero .hero-desc{font-size:1rem;line-height:1.75;color:rgba(255,255,255,.6);
  max-width:560px;margin-top:18px}
/* SECTION */
.section-label{font-family:'Space Mono',monospace;font-size:.62rem;letter-spacing:.2em;
  text-transform:uppercase;color:var(--green);margin-bottom:12px;
  display:flex;align-items:center;gap:10px}
.section-label::before{content:'';display:block;width:22px;height:1px;background:var(--green)}
.section-title{font-family:'Roboto',serif;font-size:clamp(1.8rem,3vw,2.6rem);
  line-height:1.15;color:var(--navy);margin-bottom:14px}
.section-title.light{color:#fff}
.section-desc{font-size:.93rem;line-height:1.75;color:var(--gray);max-width:600px}
.section-desc.light{color:rgba(255,255,255,.58)}
/* BUTTONS */
.btn-primary{display:inline-flex;align-items:center;gap:8px;padding:12px 26px;
  background:var(--green);color:#fff;font-weight:700;font-size:.8rem;letter-spacing:.06em;
  text-transform:uppercase;border:none;cursor:pointer;border-radius:3px;text-decoration:none;transition:all var(--tr)}
.btn-primary:hover{background:#8bc34a;transform:translateY(-2px);box-shadow:0 8px 24px rgba(124,179,66,.35)}
.btn-outline{display:inline-flex;align-items:center;gap:8px;padding:12px 26px;
  background:transparent;color:var(--navy);font-weight:500;font-size:.8rem;letter-spacing:.06em;
  text-transform:uppercase;border:1px solid rgba(13,34,20,.25);cursor:pointer;border-radius:3px;text-decoration:none;transition:all var(--tr)}
.btn-outline:hover{border-color:var(--sky);color:var(--sky)}
.btn-outline.light{color:#fff;border-color:rgba(255,255,255,.3)}
.btn-outline.light:hover{border-color:#fff;background:rgba(255,255,255,.05)}
/* FOOTER */
footer{background:#060f08;padding:52px 48px;display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px}
.fl-logo{font-family:'Roboto',serif;font-size:1.4rem;color:#fff;margin-bottom:10px}
.fl-logo span{color:var(--green)}
.fl-p{font-size:.8rem;color:rgba(255,255,255,.3);line-height:1.7;max-width:200px;margin-bottom:14px}
.social-links{display:flex;gap:8px}
.social-links a{width:32px;height:32px;border-radius:50%;background:rgba(255,255,255,.07);
  color:rgba(255,255,255,.5);text-decoration:none;display:flex;align-items:center;
  justify-content:center;font-size:.9rem;transition:all var(--tr)}
.social-links a:hover{background:var(--green);color:#fff}
.fc h4{font-size:.62rem;font-weight:700;letter-spacing:.16em;text-transform:uppercase;
  color:rgba(255,255,255,.28);margin-bottom:14px}
.fc a{display:block;font-size:.82rem;color:rgba(255,255,255,.45);text-decoration:none;
  margin-bottom:8px;transition:color var(--tr)}
.fc a:hover{color:#fff}
.footer-btm{background:#030a04;padding:18px 48px;display:flex;justify-content:space-between;align-items:center}
.footer-btm p{font-size:.72rem;color:rgba(255,255,255,.2)}
/* FADE ANIMATION */
.fade-up{opacity:0;transform:translateY(24px);transition:opacity .6s ease,transform .6s ease}
.fade-up.visible{opacity:1;transform:none}
/* RESPONSIVE */
@media(max-width:960px){
  nav{padding:0 20px}
  .nav-links{display:none;flex-direction:column;position:fixed;inset:72px 0 0 0;
    background:var(--navy);padding:24px 20px;gap:2px;z-index:199;overflow-y:auto}
  nav.open .nav-links{display:flex}
  .nav-links a{font-size:.9rem;padding:10px 16px}
  .dropdown{display:none;position:static;background:rgba(255,255,255,.05);
    border:none;border-radius:0;box-shadow:none;padding:0 0 0 16px}
  .has-drop.drop-open .dropdown{display:block}
  .hamburger{display:flex}
  .page-hero{padding:110px 20px 56px}
  footer{grid-template-columns:1fr 1fr;padding:40px 20px;gap:28px}
  .footer-btm{padding:16px 20px;flex-direction:column;gap:8px;text-align:center}
  section{padding:64px 20px !important}
}
@media(max-width:600px){
  footer{grid-template-columns:1fr}
}
.prod-detail{padding:80px 48px;background:#fff}
.detail-grid{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:start}
.gallery{display:flex;flex-direction:column;gap:12px}
.main-img{
  background:linear-gradient(135deg,#0a2010,#1a4020);
  border-radius:var(--radius);
  height:340px;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:6rem;
  position:relative;
  overflow:hidden;
  padding: 0;
}

.main-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  margin: 0;
}

.img-caption{position:absolute;bottom:0;left:0;right:0;background:linear-gradient(to top,rgba(13,34,20,.85),transparent);padding:20px;font-size:.78rem;color:rgba(255,255,255,.7)}
.thumb-row{display:flex;gap:10px}
.thumb{height:72px;border-radius:4px;background:var(--steel);flex:1;display:flex;align-items:center;justify-content:center;font-size:1.5rem;cursor:pointer;border:2px solid transparent;transition:border-color var(--tr)}
.thumb.active,.thumb:hover{border-color:var(--green)}
.prod-brand-badge{font-family:'Space Mono',monospace;font-size:.62rem;letter-spacing:.14em;text-transform:uppercase;color:var(--sky);margin-bottom:10px}
.prod-detail-title{font-family:'Roboto',serif;font-size:clamp(1.6rem,2.5vw,2.2rem);color:var(--navy);line-height:1.2;margin-bottom:16px}
.prod-short{font-size:.95rem;line-height:1.75;color:var(--gray);margin-bottom:24px}
.cert-badges{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:24px}
.cert{padding:6px 14px;border:1px solid rgba(46,125,50,.3);border-radius:20px;font-family:'Space Mono',monospace;font-size:.62rem;letter-spacing:.06em;color:var(--sky);background:rgba(46,125,50,.07)}
/* TABS */
.detail-tabs{margin-top:52px}
.tab-nav{display:flex;gap:0;border-bottom:1px solid var(--border);margin-bottom:32px}
.tab-btn{padding:12px 22px;font-size:.78rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--gray);border:none;background:transparent;cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-1px;transition:all var(--tr)}
.tab-btn.active{color:var(--green);border-bottom-color:var(--green)}
.tab-panel{display:none}.tab-panel.active{display:block}
/* specs table */
.spec-table{width:100%;border-collapse:collapse}
.spec-table tr:nth-child(even) td{background:var(--cream)}
.spec-table td{padding:10px 16px;font-size:.85rem;border-bottom:1px solid var(--border)}
.spec-table td:first-child{font-weight:600;color:var(--navy);width:40%;white-space:nowrap}
.spec-table td:last-child{color:var(--gray)}
/* downloads */
.downloads{display:flex;flex-direction:column;gap:12px}
.dl-item{display:flex;align-items:center;gap:16px;padding:18px;background:var(--cream);border:1px solid var(--border);border-radius:var(--radius);text-decoration:none;transition:all var(--tr)}
.dl-item:hover{border-color:var(--green);background:rgba(124,179,66,.06)}
.dl-icon{width:44px;height:44px;border-radius:6px;background:var(--green);color:#fff;display:flex;align-items:center;justify-content:center;font-size:1.2rem;flex-shrink:0}
.dl-name{font-weight:600;font-size:.9rem;color:var(--navy)}
.dl-size{font-size:.75rem;color:var(--gray);margin-top:2px}
.dl-arrow{margin-left:auto;color:var(--green);font-size:1rem}
/* related products */
.related{padding:72px 48px;background:var(--cream)}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:36px}
.rel-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:22px;text-decoration:none;transition:all var(--tr);display:block}
.rel-card:hover{border-color:var(--sky);transform:translateY(-3px);box-shadow:0 8px 24px rgba(13,34,20,.08)}
.rel-icon{font-size:1.8rem;margin-bottom:10px}
.rel-name{font-family:'Roboto',serif;font-size:1rem;color:var(--navy);margin-bottom:5px;line-height:1.3}
.rel-brand{font-size:.74rem;color:var(--sky)}
/* sticky sidebar CTA */
.cta-sidebar{position:sticky;top:90px;background:var(--navy);border-radius:var(--radius);padding:28px;color:#fff}
.cta-sidebar h3{font-family:'Roboto',serif;font-size:1.2rem;margin-bottom:10px}
.cta-sidebar p{font-size:.82rem;color:rgba(255,255,255,.55);line-height:1.65;margin-bottom:20px}
.cta-sidebar .btn-primary{width:100%;justify-content:center;margin-bottom:10px}
.cta-sidebar .contact-line{font-size:.75rem;color:rgba(255,255,255,.35);text-align:center;margin-top:8px}
.cta-sidebar .contact-line a{color:var(--green);text-decoration:none}
@media(max-width:960px){.detail-grid{grid-template-columns:1fr}.prod-detail,.related{padding:60px 20px}.related-grid{grid-template-columns:1fr 1fr}.cta-sidebar{position:static}}
@media(max-width:540px){.related-grid{grid-template-columns:1fr}}

/* Thêm style bổ trợ cho container video responsive */
  .video-container {
    position: relative;
    padding-bottom: 56.25%; /* Tỷ lệ khung hình 16:9 */
    height: 0;
    overflow: hidden;
    max-width: 100%;
    background: #000;
    border-radius: 4px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  }
  .video-container iframe, .video-container video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
  }
  .video-wrapper-title {
    font-family: 'Space Mono', monospace;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--gray);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
  }