/* ============================================================
   HDR Vietnam — Main CSS v3.0
   ============================================================ */

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
img,video{max-width:100%;height:auto;display:block}
a{text-decoration:none;transition:color .2s}
::selection{background:var(--hdr-primary,#f97316);color:#fff}
body{font-family:var(--font-b,'Inter',sans-serif);color:#1c1917;background:#fff;line-height:1.65}
h1,h2,h3,h4{font-family:var(--font-h,'Plus Jakarta Sans',sans-serif);line-height:1.2}

/* ── Container ───────────────────────────────── */
.container{max-width:1280px;margin:0 auto;padding:0 1.25rem}
.flex{display:flex}.items-center{align-items:center}.justify-between{justify-content:space-between}.flex-wrap{flex-wrap:wrap}

/* ── Topbar ──────────────────────────────────── */
.hdr-topbar{background:var(--hdr-navy,#0a1628);color:rgba(255,255,255,.65);font-size:.78rem;padding:.45rem 0}
.hdr-topbar a{color:rgba(255,255,255,.65)}.hdr-topbar a:hover{color:var(--hdr-primary,#f97316)}

/* ── Header ──────────────────────────────────── */
.hdr-header{background:var(--hdr-navy-mid,#0f2044);padding:.875rem 0}
.hdr-header.sticky{position:sticky;top:0;z-index:100;box-shadow:0 2px 16px rgba(0,0,0,.25)}
.hdr-logo-main{font-family:var(--font-h);font-weight:800;font-size:1.6rem;color:#fff;letter-spacing:.5px}
.hdr-logo-main span{color:var(--hdr-primary,#f97316);font-size:.9rem;font-weight:600;margin-left:.2rem}
.hdr-logo-tag{font-size:.68rem;color:rgba(255,255,255,.4);letter-spacing:1px}
.hdr-nav a{color:rgba(255,255,255,.75);font-size:.875rem;font-weight:500;padding:.25rem 0;border-bottom:1px solid transparent;transition:color .2s,border-color .2s}
.hdr-nav a:hover,.hdr-nav a.active{color:#fff;border-bottom-color:var(--hdr-primary,#f97316)}

/* ── Buttons ─────────────────────────────────── */
.btn-accent{display:inline-flex;align-items:center;gap:.5rem;background:var(--hdr-primary,#f97316);color:#fff;font-family:var(--font-h);font-weight:600;padding:.65rem 1.5rem;border-radius:8px;border:none;cursor:pointer;font-size:.9rem;transition:background .2s}
.btn-accent:hover{background:var(--hdr-pd,#ea580c);color:#fff}
.btn-ghost{display:inline-flex;align-items:center;gap:.5rem;background:rgba(255,255,255,.1);color:#fff;border:1px solid rgba(255,255,255,.25);font-family:var(--font-h);font-weight:600;padding:.65rem 1.5rem;border-radius:8px;cursor:pointer;font-size:.9rem;transition:all .2s}
.btn-ghost:hover{background:rgba(255,255,255,.18);color:#fff}

/* ── Hero ────────────────────────────────────── */
.hdr-hero{background:var(--hdr-navy-mid,#0f2044);padding:5rem 0 4rem;min-height:520px;display:flex;align-items:center}
.hdr-hero-badge{display:inline-flex;align-items:center;gap:.5rem;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.15);color:rgba(255,255,255,.85);font-size:.78rem;font-weight:500;padding:.4rem 1rem;border-radius:100px;margin-bottom:1.5rem}
.hdr-hero h1{font-size:clamp(2.2rem,4vw,3.2rem);font-weight:800;color:#fff;line-height:1.15;margin-bottom:1.25rem}
.hdr-hero h1 span{color:var(--hdr-primary,#f97316)}
.hdr-hero-sub{color:rgba(255,255,255,.65);font-size:1rem;line-height:1.7;max-width:560px;margin-bottom:2rem}
.hdr-service-mini-grid{display:grid;grid-template-columns:1fr 1fr;gap:.75rem}
.hdr-service-mini{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);border-radius:12px;padding:1.1rem;cursor:pointer;transition:border-color .2s}
.hdr-service-mini:hover{border-color:var(--hdr-primary,#f97316)}
.hdr-service-mini-icon{width:40px;height:40px;background:rgba(249,115,22,.15);border-radius:8px;display:flex;align-items:center;justify-content:center;margin-bottom:.65rem;transition:background .2s}
.hdr-service-mini:hover .hdr-service-mini-icon{background:var(--hdr-primary,#f97316)}
.hdr-service-mini-icon i{color:var(--hdr-primary,#f97316);font-size:1.1rem;transition:color .2s}
.hdr-service-mini:hover .hdr-service-mini-icon i{color:#fff}
.hdr-service-mini h4{color:#fff;font-size:.85rem;font-weight:600;margin-bottom:.15rem}
.hdr-service-mini p{color:rgba(255,255,255,.45);font-size:.72rem}

/* ── Stats bar ───────────────────────────────── */
.hdr-stats{background:var(--hdr-navy,#0a1628);padding:2rem 0}
.hdr-stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0}
.hdr-stat{text-align:center;padding:1.25rem 1rem;border-right:1px solid rgba(255,255,255,.07)}
.hdr-stat:last-child{border-right:none}
.hdr-stat-num{font-family:var(--font-h);font-size:2.2rem;font-weight:800;color:var(--hdr-primary,#f97316);line-height:1}
.hdr-stat-label{color:rgba(255,255,255,.5);font-size:.8rem;margin-top:.35rem}

/* ── Section ─────────────────────────────────── */
.hdr-section{padding:4.5rem 0}
.hdr-section-bg{background:#f8f8f6}
.hdr-section-dark{background:var(--hdr-navy,#0a1628)}
.section-label{display:inline-block;font-size:.7rem;font-weight:700;color:var(--hdr-primary,#f97316);letter-spacing:1.2px;text-transform:uppercase;margin-bottom:.4rem}
.section-title{font-size:clamp(1.7rem,3vw,2.25rem);font-weight:700;color:#1c1917;margin-bottom:.5rem}
.section-title.light{color:#fff}
.section-sub{color:#57534e;font-size:.95rem;max-width:580px}

/* ── Service cards ───────────────────────────── */
.hdr-services-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1.25rem}
.hdr-service-card{background:#fff;border:1px solid #e5e3e1;border-radius:14px;padding:2rem 1.75rem;transition:all .25s;position:relative;overflow:hidden}
.hdr-service-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:var(--hdr-primary,#f97316);transform:scaleX(0);transform-origin:left;transition:transform .3s}
.hdr-service-card:hover::before{transform:scaleX(1)}
.hdr-service-card:hover{box-shadow:0 12px 36px rgba(0,0,0,.09);transform:translateY(-3px)}
.hdr-service-icon{width:52px;height:52px;background:linear-gradient(135deg,var(--hdr-navy-mid,#0f2044),var(--hdr-navy,#0a1628));border-radius:12px;display:flex;align-items:center;justify-content:center;margin-bottom:1.25rem}
.hdr-service-icon i{color:var(--hdr-primary,#f97316);font-size:1.3rem}
.hdr-service-card h3{font-size:1.15rem;font-weight:700;margin-bottom:.65rem;color:#1c1917}
.hdr-service-card p{color:#57534e;font-size:.875rem;line-height:1.7;margin-bottom:1rem}
.hdr-service-list{list-style:none;padding:0;margin:0 0 1.25rem}
.hdr-service-list li{font-size:.85rem;color:#44403c;padding:.2rem 0;display:flex;align-items:flex-start;gap:.5rem}
.hdr-service-list li::before{content:'✓';color:var(--hdr-primary,#f97316);font-weight:700;flex-shrink:0}
.hdr-service-link{font-size:.875rem;font-weight:600;color:var(--hdr-primary,#f97316);display:inline-flex;align-items:center;gap:.35rem;transition:gap .2s}
.hdr-service-link:hover{gap:.6rem;color:var(--hdr-pd,#ea580c)}

/* ── Project grid ────────────────────────────── */
.hdr-projects-grid{display:grid;grid-template-columns:3fr 2fr 2fr;gap:1rem}
.hdr-project-card{border-radius:12px;overflow:hidden;position:relative;cursor:pointer}
.hdr-project-card:first-child{grid-row:span 2}
.hdr-project-img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.hdr-project-card:hover .hdr-project-img{transform:scale(1.04)}
.hdr-project-overlay{position:absolute;inset:0;background:linear-gradient(to top,rgba(10,22,40,.85) 0%,transparent 50%);opacity:0;transition:opacity .3s;display:flex;align-items:flex-end;padding:1.25rem}
.hdr-project-card:hover .hdr-project-overlay{opacity:1}
.hdr-project-tag{display:inline-block;background:var(--hdr-primary,#f97316);color:#fff;font-size:.7rem;font-weight:700;padding:.2rem .6rem;border-radius:4px;margin-bottom:.4rem}
.hdr-project-title{color:#fff;font-weight:700;font-size:.95rem}
.hdr-project-meta{color:rgba(255,255,255,.65);font-size:.78rem}

/* ── Process timeline ────────────────────────── */
.hdr-process{display:grid;grid-template-columns:repeat(5,1fr);gap:0;position:relative}
.hdr-process-step{text-align:center;padding:1.5rem 1rem;position:relative}
.hdr-process-step::after{content:'';position:absolute;top:28px;right:0;width:50%;height:1px;background:#e5e3e1}
.hdr-process-step:last-child::after{display:none}
.hdr-process-num{width:48px;height:48px;border-radius:50%;border:2px solid #e5e3e1;display:flex;align-items:center;justify-content:center;margin:0 auto 1rem;font-family:var(--font-h);font-weight:700;font-size:1rem;color:#57534e;background:#fff;position:relative;z-index:1;transition:all .2s}
.hdr-process-step:hover .hdr-process-num{border-color:var(--hdr-primary,#f97316);color:var(--hdr-primary,#f97316)}
.hdr-process-step h4{font-size:.9rem;font-weight:600;margin-bottom:.35rem;color:#1c1917}
.hdr-process-step p{color:#57534e;font-size:.8rem;line-height:1.5}

/* ── Testimonials ────────────────────────────── */
.hdr-testimonials-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.25rem}
.hdr-testimonial{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);border-radius:14px;padding:1.75rem;position:relative}
.hdr-testimonial::before{content:'"';position:absolute;top:1rem;right:1.25rem;font-size:4rem;line-height:1;color:rgba(249,115,22,.15);font-family:Georgia,serif}
.hdr-testimonial-text{font-size:.875rem;line-height:1.75;color:rgba(255,255,255,.7);margin-bottom:1.25rem;font-style:italic}
.hdr-testimonial-name{color:#fff;font-weight:600;font-size:.875rem;margin-bottom:.15rem}
.hdr-testimonial-role{color:rgba(255,255,255,.4);font-size:.78rem}

/* ── CTA ─────────────────────────────────────── */
.hdr-cta{background:var(--hdr-primary,#f97316);padding:4rem 0;text-align:center}
.hdr-cta h2{color:#fff;font-size:2rem;margin-bottom:.5rem}
.hdr-cta p{color:rgba(255,255,255,.85);margin-bottom:2rem}

/* ── Contact page ────────────────────────────── */
.hdr-contact-grid{display:grid;grid-template-columns:1fr 1.5fr;gap:3rem;align-items:start}
.hdr-contact-info h3{font-size:1.25rem;margin-bottom:1.25rem}
.hdr-contact-item{display:flex;gap:.875rem;margin-bottom:1.25rem}
.hdr-contact-item-icon{width:44px;height:44px;background:rgba(249,115,22,.1);border-radius:10px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.hdr-contact-item-icon i{color:var(--hdr-primary,#f97316)}
.hdr-form-group{margin-bottom:1rem}
.hdr-form-label{display:block;font-size:.82rem;font-weight:600;color:#44403c;margin-bottom:.35rem}
.hdr-form-input,.hdr-form-select,.hdr-form-textarea{width:100%;border:1px solid #e5e3e1;border-radius:8px;padding:.65rem .875rem;font-size:.9rem;outline:none;font-family:var(--font-b);transition:border-color .2s,box-shadow .2s;background:#fff}
.hdr-form-input:focus,.hdr-form-select:focus,.hdr-form-textarea:focus{border-color:var(--hdr-primary,#f97316);box-shadow:0 0 0 3px rgba(249,115,22,.1)}
.hdr-form-textarea{resize:vertical;min-height:120px}

/* ── Footer ──────────────────────────────────── */
.hdr-footer{background:var(--hdr-navy,#0a1628);color:rgba(255,255,255,.6);padding:3.5rem 0 1.5rem}
.hdr-footer h4{color:#fff;font-size:.9rem;font-weight:700;margin-bottom:.875rem}
.hdr-footer a{color:rgba(255,255,255,.5);font-size:.875rem;display:block;margin-bottom:.4rem}
.hdr-footer a:hover{color:var(--hdr-primary,#f97316)}
.hdr-footer-bottom{border-top:1px solid rgba(255,255,255,.07);padding-top:1.25rem;margin-top:2.5rem}
.hdr-footer-copy{font-size:.78rem;color:rgba(255,255,255,.3)}

/* ── Float CTA ───────────────────────────────── */
.hdr-float{position:fixed;bottom:1.5rem;right:1.5rem;z-index:999;display:flex;flex-direction:column;gap:.6rem;align-items:flex-end}
.hdr-float-btn{display:flex;align-items:center;gap:.5rem;padding:.6rem 1.1rem;border-radius:100px;font-weight:700;font-size:.82rem;color:#fff;box-shadow:0 4px 16px rgba(0,0,0,.2);transition:transform .2s}
.hdr-float-btn:hover{transform:translateY(-2px);color:#fff}
.hdr-float-zalo{background:#0068ff}
.hdr-float-phone{background:var(--hdr-primary,#f97316)}

/* ── Responsive ──────────────────────────────── */
@media(max-width:1024px){.hdr-services-grid{grid-template-columns:1fr 1fr}.hdr-projects-grid{grid-template-columns:1fr 1fr}.hdr-project-card:first-child{grid-row:auto}}
@media(max-width:768px){.hdr-services-grid{grid-template-columns:1fr}.hdr-projects-grid{grid-template-columns:1fr 1fr}.hdr-process{grid-template-columns:1fr 1fr}.hdr-process-step::after{display:none}.hdr-testimonials-grid{grid-template-columns:1fr}.hdr-stats-grid{grid-template-columns:repeat(2,1fr)}.hdr-hero{padding:3rem 0 2.5rem}.hdr-service-mini-grid{grid-template-columns:1fr 1fr}.hdr-contact-grid{grid-template-columns:1fr}.hdr-float-btn span{display:none}}
@media(max-width:480px){.hdr-projects-grid{grid-template-columns:1fr}.hdr-process{grid-template-columns:1fr}.hdr-stats-grid{grid-template-columns:repeat(2,1fr)}.hdr-section{padding:2.5rem 0}}