:root{
    --vt-soft: #f6f8fb;
    --vt-text: #0f172a;
    --vt-muted: #64748b;
    --vt-primary: #2563eb;
    --vt-primary-2: #7c3aed;
    --vt-card: #ffffff;
    --vt-border: rgba(15, 23, 42, .08);
    --vt-shadow: 0 18px 50px rgba(2, 6, 23, .10);
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
    font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    color: var(--vt-text);
    background:#fff;
}

/* Topbar */
.vt-topbar{
    background: linear-gradient(90deg, var(--vt-primary), var(--vt-primary-2));
    color:#fff;
}

/* ===== NAV FIXED (never hidden) ===== */
.vt-navbar{
    position: fixed !important;
    top: var(--vt-topbar-h) !important;
    z-index: 999999 !important;
    left: 0; right: 0;
    background: rgba(255,255,255,.96) !important;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom:1px solid var(--vt-border);
    box-shadow: 0 10px 30px rgba(2,6,23,.08);
}
/* ===== Brand nổi bật ===== */
.vt-navbar .navbar-brand {
    text-decoration: none;
    line-height: 1.2;
}

/* Icon mark nổi */
.vt-navbar .vt-mark {
    width: 46px;
    height: 46px;
    min-width: 46px;
    border-radius: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;

    /* Gradient nổi bật */
    background: linear-gradient(
            135deg,
            #0ea5e9,   /* sky-500 */
            #2563eb   /* blue-600 */
    );

    color: #ffffff;
    box-shadow:
            0 10px 30px rgba(14, 165, 233, 0.45),
            inset 0 0 0 1px rgba(255,255,255,0.15);

    transition: all 0.25s ease;
}

.vt-navbar .vt-mark i {
    font-size: 1.3rem;
}

/* Text */
.vt-navbar .navbar-brand .fw-bold {
    font-size: 1.18rem;
    font-weight: 800;
    letter-spacing: 0.3px;
    text-shadow: 0 2px 12px rgba(37, 99, 235, 0.35);
    /* Gradient text */
    background: linear-gradient(
            135deg,
            #2563eb,   /* blue-600 */
            #0ea5e9    /* sky-500 */
    );
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;

    /* Fallback */
    color: #2563eb;

    line-height: 1.25;
}

.vt-navbar .navbar-brand .small {
    font-size: 0.76rem;
    color: #475569; /* slate-600 */
    letter-spacing: 0.25px;
}

/* Hover effect */
.vt-navbar .navbar-brand:hover .vt-mark {
    transform: translateY(-2px) scale(1.03);
    box-shadow:
            0 14px 38px rgba(37, 99, 235, 0.55),
            inset 0 0 0 1px rgba(255,255,255,0.2);
}
section{ scroll-margin-top: 92px; }

.navbar .nav-link{
    color: #0f172a;
    font-weight: 600;
    opacity: .92;
}
.navbar .nav-link:hover{ color: var(--vt-primary); }

.vt-mark{
    width:42px;height:42px;
    border-radius: 14px;
    background: rgba(37,99,235,.10);
    display:grid;place-items:center;
    color: var(--vt-primary);
    border:1px solid rgba(37,99,235,.15);
}
.vt-mark--dark{
    background: rgba(255,255,255,.10);
    color:#fff;
    border:1px solid rgba(255,255,255,.14);
}

.vt-soft{ background: var(--vt-soft); }

/* Floating CTA right */
.vt-fab{
    position: fixed;
    right: 14px;
    top: 42%;
    transform: translateY(-50%);
    z-index: 9999;
    display: grid;
    gap: 10px;
}
.vt-fab-btn{
    width: 52px;
    height: 52px;
    border-radius: 14px;
    background: #fff;
    border: 1px solid rgba(2,6,23,.10);
    box-shadow: 0 14px 40px rgba(2,6,23,.18);
    display: grid;
    place-items: center;
    color: #0f172a;
    text-decoration: none;
    transition: transform .15s ease, box-shadow .15s ease;
}
.vt-fab-btn:hover{
    transform: translateY(-2px);
    box-shadow: 0 18px 50px rgba(2,6,23,.22);
}
.vt-fab-chat{ color:#2563eb; }
.vt-fab-phone{ color:#16a34a; }
.vt-fab-mail{ color:#f59e0b; }
.vt-fab-top{ color:#334155; }

/* HERO full width owl */
.vt-hero-wrap{ position: relative; }
.heroCarousel .owl-stage-outer{ overflow: hidden; }

.vt-hero-slide{
    position: relative;
    min-height: 84vh;
    display: flex;
    align-items: center;
    background-image: var(--bg);
    background-size: cover;
    background-position: center;
}
.vt-hero-overlay{
    position:absolute; inset:0;
    background:
            radial-gradient(1100px 700px at 20% 20%, rgba(37,99,235,.38), transparent 60%),
            radial-gradient(900px 600px at 90% 25%, rgba(124,58,237,.34), transparent 62%),
            linear-gradient(180deg, rgba(2,6,23,.55), rgba(2,6,23,.72));
}
.vt-hero-inner{
    position: relative;
    z-index: 2;
    padding: 56px 0;
}
.vt-hero-lead{ color: rgba(255,255,255,.86); }
.vt-grad2{
    background: linear-gradient(90deg, #93c5fd, #c4b5fd);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.vt-pill{
    display:inline-flex;
    align-items:center;
    gap:.35rem;
    padding:.45rem .75rem;
    border-radius:999px;
    font-size:.92rem;
    border:1px solid rgba(255,255,255,.20);
    background: rgba(255,255,255,.10);
    color:#fff;
    backdrop-filter: blur(6px);
}

.vt-mini{
    padding: .85rem .9rem;
    border:1px solid rgba(255,255,255,.18);
    border-radius: 16px;
    background: rgba(255,255,255,.08);
    backdrop-filter: blur(6px);
}

.vt-hero-card{
    background:#fff;
    border:1px solid rgba(255,255,255,.18);
    border-radius: 22px;
    padding: 18px;
    box-shadow: 0 22px 70px rgba(2, 6, 23, .35);
}

.vt-hero-list{ display:grid; gap: 10px; }
.vt-hero-item{
    display:flex;
    gap: 12px;
    align-items:flex-start;
    padding: 12px 12px;
    border:1px solid rgba(2,6,23,.06);
    border-radius: 18px;
    background: #fff;
}
.vt-hero-item i{
    width:36px;height:36px;
    border-radius: 14px;
    display:grid;place-items:center;
    background: rgba(37,99,235,.10);
    color: var(--vt-primary);
    border:1px solid rgba(37,99,235,.14);
}
.vt-hero-cta{
    border:1px dashed rgba(2,6,23,.15);
    background: rgba(2,6,23,.02);
}

/* Owl controls: prev/next center left-right */
.heroCarousel .owl-nav{
    position: absolute;
    inset: 0;
    z-index: 6;
    pointer-events: none;
    margin: 0;
}
.heroCarousel .owl-nav button.owl-prev,
.heroCarousel .owl-nav button.owl-next{
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: auto;
    width: 44px;
    height: 44px;
    border-radius: 14px;
    border:1px solid rgba(255,255,255,.25) !important;
    background: rgba(255,255,255,.10) !important;
    color:#fff !important;
    backdrop-filter: blur(6px);
}
.heroCarousel .owl-nav button.owl-prev{ left: 18px; }
.heroCarousel .owl-nav button.owl-next{ right: 18px; }

.heroCarousel .owl-dots{
    position:absolute;
    left:0; right:0;
    bottom: 16px;
    z-index: 6;
}
.heroCarousel .owl-dots .owl-dot span{
    width: 10px; height: 10px;
    background: rgba(255,255,255,.45) !important;
}
.heroCarousel .owl-dots .owl-dot.active span{ background: #fff !important; }

@media (max-width: 576px){
    .heroCarousel .owl-nav button.owl-prev{ left: 10px; }
    .heroCarousel .owl-nav button.owl-next{ right: 10px; }
}

/* Compatibility chips */
.vt-compat .vt-chip{
    padding:.5rem .75rem;
    border-radius: 999px;
    border:1px solid rgba(2,6,23,.08);
    background:#fff;
    font-size:.92rem;
    color:#0f172a;
}

/* Section head */
.vt-sectionhead h2{ letter-spacing:-.02em; }

/* Cards */
.vt-card{
    background: var(--vt-card);
    border:1px solid var(--vt-border);
    border-radius: 22px;
    padding: 18px;
    box-shadow: 0 14px 36px rgba(2,6,23,.06);
}

/* icon + title same row */
.vt-card-head{
    display:flex;
    align-items:center;
    gap: 12px;
}
.vt-icon{
    width:42px;height:42px;
    border-radius: 16px;
    display:grid;place-items:center;
    background: rgba(124,58,237,.10);
    border: 1px solid rgba(124,58,237,.14);
    color: var(--vt-primary-2);
    font-size: 16px;
    flex: 0 0 auto;
}

.vt-panel{
    background:#fff;
    border:1px solid var(--vt-border);
    border-radius: 22px;
    box-shadow: 0 14px 36px rgba(2,6,23,.06);
}

.vt-ul{
    list-style:none;
    padding-left:0;
    margin:0;
    display:grid;
    gap: 10px;
}
.vt-ul li{
    display:flex;
    gap: 10px;
    align-items:flex-start;
    color: var(--vt-muted);
}
.vt-ul i{
    margin-top: 2px;
    color: #16a34a;
}

.vt-note{
    padding: 12px 14px;
    border-radius: 18px;
    border:1px solid rgba(2,6,23,.10);
    background: rgba(2,6,23,.03);
    color: #334155;
}

/* Steps */
.vt-steps{ display:grid; gap: 12px; }
.vt-step{
    display:flex;
    gap: 12px;
    align-items:flex-start;
    padding: 14px 14px;
    border:1px solid rgba(2,6,23,.08);
    border-radius: 18px;
    background:#fff;
}
.vt-stepnum{
    width:34px;height:34px;
    border-radius: 14px;
    display:grid;place-items:center;
    background: rgba(37,99,235,.12);
    border:1px solid rgba(37,99,235,.16);
    color: var(--vt-primary);
    font-weight: 800;
}

/* Pricing */
.vt-price{
    background:#fff;
    border:1px solid var(--vt-border);
    border-radius: 24px;
    padding: 18px;
    box-shadow: 0 16px 40px rgba(2,6,23,.06);
}
.vt-price--best{
    border: 2px solid rgba(37,99,235,.28);
    box-shadow: 0 22px 60px rgba(37,99,235,.12);
    transform: translateY(-4px);
}
.vt-priceval{
    font-weight: 800;
    font-size: 30px;
    letter-spacing: -.02em;
}

/* FAQ */
.vt-acc .accordion-item{
    border:1px solid var(--vt-border);
    border-radius: 18px !important;
    overflow:hidden;
    margin-bottom: 10px;
}
.vt-acc .accordion-button{
    font-weight: 700;
    background:#fff;
}
.vt-acc .accordion-button:focus{
    box-shadow: 0 0 0 .2rem rgba(37,99,235,.15);
}

/* Contact */
.vt-contactbox{ display:grid; gap: 12px; }
.vt-contactitem{
    display:flex;
    gap: 12px;
    align-items:flex-start;
    padding: 12px;
    border:1px solid rgba(2,6,23,.08);
    border-radius: 18px;
    background:#fff;
}
.vt-contactitem i{
    width:38px;height:38px;
    border-radius: 16px;
    display:grid;place-items:center;
    background: rgba(2,6,23,.06);
    color:#0f172a;
}

/* Footer */
.vt-footer{
    background: #0b1220;
    color:#fff;
}
.vt-footer .vt-link{
    color: rgba(255,255,255,.82);
    text-decoration:none;
}
.vt-footer .vt-link:hover{ color:#fff; text-decoration:underline; }
.vt-footer .text-muted{ color: rgba(255,255,255,.72) !important; }
.vt-soc{
    width:38px;height:38px;
    border-radius: 14px;
    display:grid;place-items:center;
    border:1px solid rgba(255,255,255,.16);
    color:#fff;
    text-decoration:none;
    background: rgba(255,255,255,.06);
}
.vt-soc:hover{ background: rgba(255,255,255,.10); }

/* Buttons */
.btn-primary{
    background: var(--vt-primary);
    border-color: var(--vt-primary);
}
.btn-primary:hover{
    background:#1d4ed8;
    border-color:#1d4ed8;
}

/* ===== Testimonials Vertical Ticker (3 items visible) ===== */
.vt-vertical-wrap{
    position: relative;
    height: 420px;
    overflow: hidden;
    border-radius: 18px;
}
.vt-ticker{
    display: grid;
    gap: 12px;
    will-change: transform;
}
.vt-testi2{
    background:#fff;
    border:1px solid rgba(15,23,42,.08);
    border-radius: 18px;
    padding: 14px 14px;
    box-shadow: 0 12px 30px rgba(2,6,23,.08);
    min-height: 124px;
    display:flex;
    flex-direction: column;
    gap: 10px;
}
.vt-testi2__stars i{ color:#f59e0b; margin-right:3px; }
.vt-testi2__text{ color:#334155; font-size: .95rem; line-height: 1.35; }
.vt-testi2__meta{ display:flex; align-items:center; gap: 10px; margin-top: auto; }
.vt-avatar{
    width: 38px; height: 38px;
    border-radius: 14px;
    display:grid; place-items:center;
    background: rgba(37,99,235,.10);
    border: 1px solid rgba(37,99,235,.14);
    color:#2563eb;
    font-weight: 800;
}
/* CTA band */
.vt-cta{
    background: linear-gradient(90deg, rgba(37,99,235,1), rgba(124,58,237,1));
    color:#fff;
}
.vt-cta .text-muted{ color: rgba(255,255,255,.82) !important; }
/* Responsive */
@media (max-width: 991.98px){
    .vt-price--best{ transform:none; }
    .vt-hero-slide{ min-height: 78vh; }
    .vt-vertical-wrap{ height: 360px; }
    .vt-testi2{ min-height: 112px; }
}
:root{ --vt-topbar-h: 40px; } /* chỉnh nếu topbar cao hơn */

.vt-topbar{
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000000;
}