:root{--otto:#28b8bb;--otto-dark:#0b7d84;--otto-deep:#075b63;--ink:#102033;--muted:#687887;--line:#dce9ea;--pale:#effafa}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;color:var(--ink)}
img{max-width:100%;display:block}.topbar{background:var(--otto-deep);color:#fff;text-align:center;padding:8px;font-size:12px;font-weight:750;letter-spacing:.08em}
.header{position:sticky;top:0;z-index:20;background:#fff;border-bottom:1px solid var(--line)}.nav{width:min(1180px,calc(100% - 36px));height:78px;margin:auto;display:flex;align-items:center;justify-content:space-between}.nav img{width:220px;height:54px;object-fit:contain}.nav nav{display:flex;gap:26px}.nav a{text-decoration:none;color:var(--ink);font-weight:650}
.hero{background:linear-gradient(120deg,#07565e 0%,#0b7d84 55%,#28b8bb 100%);color:#fff;padding:76px 0}.hero-inner{width:min(1180px,calc(100% - 36px));margin:auto;display:grid;grid-template-columns:1.05fr .95fr;gap:45px;align-items:center}.hero-copy>span,.eyebrow{font-size:13px;font-weight:800;letter-spacing:.16em;color:#b9ffff}.hero h1{font-size:60px;line-height:1.03;margin:17px 0}.hero p{font-size:18px;line-height:1.65}.hero a,.support>a{display:inline-block;margin-top:14px;background:#fff;color:var(--otto-dark);padding:14px 22px;border-radius:999px;text-decoration:none;font-weight:800}.hero-visual{background:rgba(255,255,255,.14);border-radius:28px;padding:0;overflow:hidden;display:flex;align-items:center;justify-content:center}.hero-visual img{display:block;width:100%;height:auto;max-height:none;object-fit:cover;border-radius:28px;background:transparent}
.highlights{width:min(1180px,calc(100% - 36px));margin:auto;display:grid;grid-template-columns:repeat(4,1fr);gap:18px;padding:34px 0}.highlights article{border:1px solid var(--line);border-radius:16px;padding:18px;background:#fff}.icon{width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:#ddf7f6;color:var(--otto-dark);font-weight:900;margin-bottom:12px}.highlights b{display:block;margin-bottom:7px}.highlights span{font-size:14px;color:var(--muted);line-height:1.5}
.section{width:min(1180px,calc(100% - 36px));margin:auto;padding:78px 0}.section-head{display:flex;justify-content:space-between;align-items:end;margin-bottom:30px}.section .eyebrow{color:var(--otto-dark)}h2{font-size:42px;margin:8px 0}.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.product-card{border:1px solid var(--line);border-radius:20px;overflow:hidden;background:#fff}.image-box{height:310px;background:#f3fafa;padding:22px}.image-box img{width:100%;height:100%;object-fit:contain}.product-info{padding:22px}.badge{display:inline-block;background:#dff7f6;color:var(--otto-dark);border-radius:999px;padding:7px 10px;font-size:12px;font-weight:800}.product-info h3{font-size:24px;margin:12px 0}.product-info p{color:var(--muted);line-height:1.6}.product-info a{color:var(--otto-dark);font-weight:800;text-decoration:none}
.compare{border:1px solid var(--line);border-radius:18px;overflow:hidden;background:#fff}.compare>div{display:grid;grid-template-columns:1.2fr 1fr 2fr;padding:17px 20px;border-bottom:1px solid var(--line)}.compare>div:first-child{font-weight:800;background:#e3f7f6}
.support{background:var(--otto-dark);color:#fff;padding:55px max(18px,calc((100% - 1180px)/2));display:flex;justify-content:space-between;align-items:center}.support .eyebrow{color:#b9ffff}.zalo-number{font-size:18px}footer{background:#061d22;color:#fff;padding:28px max(18px,calc((100% - 1180px)/2));display:flex;justify-content:space-between;align-items:center}footer img{display:none}
.product-detail{width:min(1100px,calc(100% - 36px));margin:auto;padding:60px 0}.detail-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}.detail-grid img{width:100%;height:520px;object-fit:contain;background:#f3fafa;border-radius:20px}.detail-grid li{margin:11px 0}
@media(max-width:850px){.nav nav{display:none}.hero-inner,.detail-grid{grid-template-columns:1fr}.hero h1{font-size:43px}.hero-visual img{height:auto;max-height:none}.highlights{grid-template-columns:1fr 1fr}.section-head{display:block}.product-grid{grid-template-columns:1fr}.support,footer{display:block}.support>a{margin-top:14px}.compare>div{grid-template-columns:1fr}.compare>div:first-child{display:none}footer img{display:none}}.product-detail{width:min(1120px,calc(100% - 36px));margin:auto;padding:60px 0}.detail-grid{display:grid;grid-template-columns:1fr 1fr;gap:42px;align-items:start}.detail-main-image{width:100%;height:520px;object-fit:contain;background:#f3fafa;border-radius:20px}.gallery{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:12px}.gallery img{height:100px;object-fit:cover;border-radius:10px;border:1px solid var(--line)}.spec-table{width:100%;border-collapse:collapse;margin-top:18px}.spec-table td{padding:12px;border-bottom:1px solid var(--line)}.spec-table td:first-child{font-weight:700;width:35%}.video-wrap{position:relative;padding-top:56.25%;margin-top:24px}.video-wrap iframe{position:absolute;inset:0;width:100%;height:100%;border:0;border-radius:16px}.faq details{border-bottom:1px solid var(--line);padding:14px 0}.faq summary{font-weight:700;cursor:pointer}.download-list a{display:block;padding:12px 0;border-bottom:1px solid var(--line);color:var(--otto-dark);font-weight:700;text-decoration:none}@media(max-width:850px){.detail-grid{grid-template-columns:1fr}.gallery{grid-template-columns:repeat(3,1fr)}}


/* V5.2 - Quyền lợi đại lý & popup */
.dealer-benefits-section{padding:0 max(18px,calc((100% - 1180px)/2)) 78px}
.dealer-benefits-inner{background:linear-gradient(135deg,#effafa,#dff7f6);border:1px solid var(--line);border-radius:24px;padding:38px 42px;display:flex;align-items:center;justify-content:space-between;gap:30px}
.dealer-benefits-inner .eyebrow{color:var(--otto-dark)}
.dealer-benefits-inner h2{margin:8px 0 10px;font-size:38px}
.dealer-benefits-inner p{margin:0;color:var(--muted);font-size:17px;line-height:1.6}
.dealer-benefits-button{border:0;background:var(--otto-dark);color:#fff;padding:14px 22px;border-radius:999px;font-weight:800;font-size:15px;cursor:pointer;white-space:nowrap}
.dealer-benefits-button:hover{background:var(--otto-deep)}
.dealer-modal{position:fixed;inset:0;z-index:9999;display:none;align-items:center;justify-content:center;padding:20px}
.dealer-modal.is-open{display:flex}
.dealer-modal-backdrop{position:absolute;inset:0;background:rgba(3,24,29,.72);backdrop-filter:blur(4px)}
.dealer-modal-dialog{position:relative;z-index:1;width:min(720px,100%);max-height:88vh;overflow:auto;background:#fff;border-radius:24px;padding:36px 38px;box-shadow:0 28px 90px rgba(0,0,0,.28)}
.dealer-modal-dialog .eyebrow{color:var(--otto-dark)}
.dealer-modal-dialog h2{font-size:36px;margin:9px 45px 20px 0}
.dealer-modal-content{font-size:17px;line-height:1.9;color:#314552;white-space:normal}
.dealer-modal-close{position:absolute;right:18px;top:16px;width:42px;height:42px;border:0;border-radius:50%;background:#edf6f6;color:var(--otto-deep);font-size:30px;line-height:1;cursor:pointer}
.dealer-modal-contact{display:inline-block;margin-top:24px;background:var(--otto-dark);color:#fff;text-decoration:none;padding:13px 20px;border-radius:999px;font-weight:800}
body.modal-open{overflow:hidden}
@media(max-width:850px){.dealer-benefits-inner{display:block;padding:28px 24px}.dealer-benefits-inner h2{font-size:31px}.dealer-benefits-button{margin-top:20px;width:100%}.dealer-modal-dialog{padding:30px 22px}.dealer-modal-dialog h2{font-size:29px}.dealer-modal-content{font-size:16px}}


/* V5.4 - Footer không hiển thị logo; quyền lợi đại lý chỉ mở bằng popup */
footer p{margin:0;line-height:1.65}
.dealer-benefits-section{display:none!important}

/* V5.6 - Ottocast warranty portal */
.nav a.active{color:var(--otto-dark)}.brand-home{display:flex;align-items:center}.warranty-page{background:#f4f9f9;min-height:70vh;padding:54px 18px 78px}.warranty-hero,.warranty-card,.warranty-help{width:min(980px,100%);margin-left:auto;margin-right:auto}.warranty-hero{text-align:center;padding:20px 0 30px}.warranty-hero .eyebrow{color:var(--otto-dark)}.warranty-hero h1{font-size:46px;margin:10px 0 12px}.warranty-hero p{max-width:720px;margin:0 auto;color:var(--muted);font-size:17px;line-height:1.65}.warranty-hero.compact{padding-bottom:22px}.warranty-card{background:#fff;border:1px solid var(--line);border-radius:24px;padding:30px;box-shadow:0 14px 45px rgba(7,91,99,.06)}.warranty-form label,.activation-form label{display:block;font-weight:750;margin-bottom:8px}.warranty-search{display:grid;grid-template-columns:1fr auto;gap:12px}.warranty-search input,.activation-form input,.activation-form textarea{width:100%;border:1px solid #cfe0e1;border-radius:13px;padding:14px 15px;font:inherit;outline:none;background:#fff}.warranty-search input:focus,.activation-form input:focus,.activation-form textarea:focus{border-color:var(--otto);box-shadow:0 0 0 3px rgba(40,184,187,.12)}.warranty-search button,.activation-form button{border:0;border-radius:13px;padding:14px 20px;background:var(--otto-dark);color:#fff;font-weight:800;font:inherit;cursor:pointer}.warranty-form small{display:block;color:var(--muted);margin-top:9px}.warranty-alert{margin-top:22px;border-radius:15px;padding:16px 18px;display:flex;flex-direction:column;gap:4px}.warranty-alert.warning{background:#fff7e7;color:#815000;border:1px solid #f4dfb1}.warranty-alert.success{background:#eaf9f1;color:#096b43;border:1px solid #c7ecd9}.warranty-result{margin-top:28px;border-top:1px solid var(--line);padding-top:26px}.result-head{display:flex;align-items:flex-start;justify-content:space-between;gap:20px}.result-kicker{font-size:12px;font-weight:850;color:var(--otto-dark);letter-spacing:.12em}.result-head h2{font-size:30px;margin:7px 0 0}.status-pill{background:#e1f7f4;color:#08746e;border-radius:999px;padding:8px 11px;font-size:13px;font-weight:800}.result-grid,.activation-product{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:20px}.result-grid>div,.activation-product>div{background:#f4f9f9;border-radius:14px;padding:15px}.result-grid span,.activation-product span{display:block;color:var(--muted);font-size:13px;margin-bottom:5px}.result-grid b,.activation-product b{overflow-wrap:anywhere}.warranty-notice{margin-top:18px;background:#eef9fb;border-left:4px solid var(--otto);padding:15px 17px;border-radius:10px;color:#31515a;line-height:1.6}.activate-button{display:inline-block;margin-top:18px;background:var(--otto-dark);color:#fff;text-decoration:none;padding:13px 19px;border-radius:999px;font-weight:800}.warranty-help{margin-top:18px;background:#0b7d84;color:#fff;border-radius:20px;padding:22px 26px;display:flex;align-items:center;justify-content:space-between;gap:20px}.warranty-help p{margin:5px 0 0;color:#d9ffff}.warranty-help a{background:#fff;color:var(--otto-dark);text-decoration:none;padding:12px 16px;border-radius:999px;font-weight:800;white-space:nowrap}.activation-form{margin-top:24px}.activation-form>div{margin-top:16px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.activation-form textarea{min-height:110px;resize:vertical}.activation-form button{width:100%;margin-top:20px;padding:15px}.form-note{color:var(--muted);font-size:13px;text-align:center;line-height:1.5}.activation-done{margin-top:24px;padding:20px;background:#eef9f5;border-radius:15px}.activation-done p{color:var(--muted)}.activation-done a{color:var(--otto-dark);font-weight:800;text-decoration:none}
@media(max-width:850px){.warranty-page{padding:32px 14px 55px}.warranty-hero h1{font-size:34px}.warranty-card{padding:20px;border-radius:18px}.warranty-search{grid-template-columns:1fr}.warranty-search button{width:100%}.result-head{display:block}.status-pill{display:inline-block;margin-top:12px}.result-grid,.activation-product,.form-grid{grid-template-columns:1fr}.warranty-help{display:block}.warranty-help a{display:inline-block;margin-top:16px}.result-head h2{font-size:25px}}

/* V5.7 - Mobile navigation & responsive compare polish */
@media(max-width:850px){
  .topbar{
    padding:8px 6px;
    font-size:clamp(7px,2.15vw,11px);
    line-height:1.2;
    letter-spacing:.055em;
    white-space:nowrap;
    overflow:hidden;
  }
  .nav{
    width:100%;
    height:auto;
    padding:14px 14px 12px;
    display:flex;
    flex-direction:column;
    align-items:center;
    gap:12px;
  }
  .nav>a,.nav>.brand-home{justify-content:center}
  .nav img{width:150px;height:44px}
  .nav nav{
    display:grid;
    grid-template-columns:repeat(3,minmax(0,1fr));
    gap:7px;
    width:100%;
  }
  .nav nav a{
    min-height:38px;
    padding:8px 5px;
    border:1px solid var(--line);
    border-radius:10px;
    background:#f7fbfb;
    display:flex;
    align-items:center;
    justify-content:center;
    text-align:center;
    font-size:11px;
    line-height:1.15;
    font-weight:750;
  }
  .nav nav a:active{background:#e7f7f6;color:var(--otto-dark)}

  #compare.section{
    width:min(100% - 28px,1180px);
    padding:48px 0 44px;
  }
  #compare>.eyebrow{display:block;margin-bottom:7px}
  #compare>h2{
    margin:0 0 22px;
    font-size:clamp(24px,7.2vw,31px);
    line-height:1.08;
    letter-spacing:-.045em;
    white-space:nowrap;
  }
  .compare{
    border:0;
    border-radius:0;
    overflow:visible;
    background:transparent;
    display:grid;
    gap:12px;
  }
  .compare>div:first-child{display:none}
  .compare>div:not(:first-child){
    display:grid;
    grid-template-columns:1fr auto;
    gap:7px 10px;
    padding:17px 18px;
    border:1px solid var(--line);
    border-radius:16px;
    background:#fff;
    box-shadow:0 8px 24px rgba(7,91,99,.055);
  }
  .compare>div:not(:first-child)>span:first-child{
    grid-column:1;
    font-size:18px;
    line-height:1.2;
    font-weight:800;
    color:var(--ink);
  }
  .compare>div:not(:first-child)>span:nth-child(2){
    grid-column:2;
    align-self:start;
    padding:5px 9px;
    border-radius:999px;
    background:#e6f7f6;
    color:var(--otto-dark);
    font-size:11px;
    line-height:1.15;
    font-weight:800;
    white-space:nowrap;
  }
  .compare>div:not(:first-child)>span:nth-child(3){
    grid-column:1 / -1;
    color:var(--muted);
    font-size:14px;
    line-height:1.5;
  }
  #compare+.dealer-modal+.support,
  #compare+.support{margin-top:0}
  .support{padding-top:42px;padding-bottom:42px}
}

@media(max-width:390px){
  .nav{padding-left:10px;padding-right:10px}
  .nav nav{gap:6px}
  .nav nav a{font-size:10.5px;padding-left:3px;padding-right:3px}
  #compare>h2{font-size:clamp(23px,7vw,28px)}
}

/* V5.8 - Compact mobile header/menu */
.mobile-nav-toggle{display:none}
.brand-home{text-decoration:none;color:var(--ink)}
@media(max-width:850px){
  .header{position:sticky;top:0;z-index:50;overflow:visible}
  .nav{
    position:relative;
    width:100%;
    height:52px;
    padding:5px 14px;
    display:flex;
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
    gap:10px;
  }
  .nav .brand-home{
    display:flex;
    align-items:center;
    justify-content:flex-start;
    min-width:0;
    flex:0 1 auto;
  }
  .nav .brand-home img,.nav>a img{
    width:118px;
    height:36px;
    object-fit:contain;
    object-position:left center;
  }
  .nav .brand-text{font-size:18px}
  .mobile-nav-toggle{
    display:flex;
    width:38px;
    height:38px;
    padding:9px;
    border:1px solid var(--line);
    border-radius:11px;
    background:#f7fbfb;
    flex:0 0 38px;
    flex-direction:column;
    justify-content:center;
    gap:4px;
    cursor:pointer;
  }
  .mobile-nav-toggle span{
    display:block;
    width:100%;
    height:2px;
    border-radius:2px;
    background:var(--otto-deep);
    transition:transform .2s ease,opacity .2s ease;
  }
  .mobile-menu-open .mobile-nav-toggle span:nth-child(1){transform:translateY(6px) rotate(45deg)}
  .mobile-menu-open .mobile-nav-toggle span:nth-child(2){opacity:0}
  .mobile-menu-open .mobile-nav-toggle span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
  .nav nav{
    display:none;
    position:absolute;
    top:calc(100% + 1px);
    left:10px;
    right:10px;
    width:auto;
    padding:8px;
    grid-template-columns:1fr;
    gap:2px;
    background:#fff;
    border:1px solid var(--line);
    border-radius:14px;
    box-shadow:0 14px 34px rgba(7,91,99,.16);
    max-height:calc(100vh - 100px);
    overflow:auto;
  }
  .mobile-menu-open .nav nav{display:grid}
  .nav nav a{
    min-height:0;
    padding:11px 12px;
    border:0;
    border-radius:9px;
    background:transparent;
    display:flex;
    align-items:center;
    justify-content:flex-start;
    text-align:left;
    font-size:13px;
    line-height:1.2;
    font-weight:720;
  }
  .nav nav a:hover,.nav nav a:active,.nav nav a.active{background:#eef9f9;color:var(--otto-dark)}
}


/* V5.11 - Hero electronic warranty CTA: button + separate caption */
.hero-actions{display:flex;flex-direction:column;align-items:flex-start;margin-top:28px;gap:7px}
.hero-actions .hero-warranty{margin-top:0;display:inline-flex;align-items:center;justify-content:center;text-decoration:none;background:#fff;color:var(--otto-dark);padding:13px 22px;border-radius:999px;font-size:16px;line-height:1.2;font-weight:850;box-shadow:0 8px 22px rgba(4,63,69,.12);transition:transform .12s ease,box-shadow .12s ease,background-color .12s ease;user-select:none;-webkit-tap-highlight-color:transparent}
.hero-actions .hero-warranty:hover{transform:translateY(-1px);box-shadow:0 10px 26px rgba(4,63,69,.16)}
.hero-actions .hero-warranty:active{transform:translateY(1px) scale(.97);box-shadow:0 3px 10px rgba(4,63,69,.16);background:#f3f8f8}
.hero-actions .hero-warranty:focus-visible{outline:3px solid rgba(255,255,255,.55);outline-offset:3px}
.hero-warranty-note{display:block;margin-left:2px;color:rgba(255,255,255,.84);font-size:12px;line-height:1.4;font-weight:600}
.official-product-note{margin:5px 0 0;color:var(--muted);font-size:14px;line-height:1.4}
@media(max-width:850px){
  .hero{padding:46px 0}
  .hero-actions{margin-top:22px;width:100%;gap:7px}
  .hero-actions .hero-warranty{width:auto;min-width:190px;box-sizing:border-box;padding:14px 20px}
  .hero-warranty-note{font-size:12px;white-space:normal}
  .official-product-note{font-size:13px}
}

/* V5.13 - Warranty mobile title + same navigation as homepage */
@media (max-width:850px){
  .warranty-hero h1{
    white-space:nowrap;
    font-size:clamp(16px,5.2vw,23px);
    line-height:1.15;
    letter-spacing:-.035em;
  }
}

/* V5.14 - Warranty intro one-line desktop + serial location guide */
.warranty-hero{width:min(1180px,100%)}
.warranty-hero .warranty-intro{
  max-width:none;
  width:100%;
  white-space:nowrap;
  font-size:clamp(14px,1.25vw,17px);
}
.serial-guide{
  width:min(820px,100%);
  margin:24px auto 4px;
  padding:18px 22px;
  display:grid;
  grid-template-columns:minmax(0,1fr) 300px;
  gap:24px;
  align-items:center;
  text-align:left;
  background:#fff;
  border:1px solid var(--line);
  border-radius:20px;
  box-shadow:0 10px 30px rgba(7,91,99,.05);
}
.serial-guide-kicker{
  display:block;
  margin-bottom:5px;
  color:var(--otto-dark);
  font-size:11px;
  font-weight:850;
  letter-spacing:.14em;
}
.serial-guide h2{
  margin:0 0 7px;
  color:#102033;
  font-size:20px;
  line-height:1.25;
}
.serial-guide p{
  margin:0;
  max-width:none;
  color:var(--muted);
  font-size:14px;
  line-height:1.55;
}
.serial-guide-image{
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:132px;
}
.serial-guide-image img{
  display:block;
  width:100%;
  max-width:300px;
  height:auto;
  object-fit:contain;
}
@media(max-width:850px){
  .warranty-hero .warranty-intro{
    white-space:normal;
    width:min(100%,680px);
    font-size:16px;
  }
  .serial-guide{
    width:100%;
    margin-top:22px;
    padding:18px;
    grid-template-columns:1fr;
    gap:14px;
    text-align:left;
    border-radius:18px;
  }
  .serial-guide h2{font-size:18px}
  .serial-guide p{font-size:13px;line-height:1.5}
  .serial-guide-image{min-height:0}
  .serial-guide-image img{max-width:280px;margin:0 auto}
}
@media(max-width:420px){
  .serial-guide{padding:16px}
  .serial-guide-image img{max-width:240px}
}