/* =============================================
   SƠN CÔNG NGHIỆP - Main Stylesheet
   Primary Color: #0A3D62 (Deep Blue)
   Accent: #F0A500 (Industrial Gold)
   ============================================= */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;500;600;700;800&family=Roboto:wght@300;400;500;700&display=swap');

/* --- CSS Variables --- */
:root {
  --primary:       #0A3D62;
  --primary-light: #1a5276;
  --primary-dark:  #062135;
  --accent:        #F0A500;
  --accent-hover:  #d4920a;
  --text-dark:     #1a1a2e;
  --text-mid:      #4a5568;
  --text-light:    #718096;
  --bg-light:      #f7f9fc;
  --bg-white:      #ffffff;
  --border:        #e2e8f0;
  --success:       #27ae60;
  --danger:        #e74c3c;
  --shadow-sm:     0 2px 8px rgba(10,61,98,.08);
  --shadow-md:     0 4px 20px rgba(10,61,98,.14);
  --shadow-lg:     0 8px 40px rgba(10,61,98,.18);
  --radius:        8px;
  --radius-lg:     16px;
  --transition:    .25s ease;
  --font-head:     'Montserrat', sans-serif;
  --font-body:     'Roboto', sans-serif;
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  color: var(--text-dark);
  background: var(--bg-white);
  line-height: 1.65;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* --- Utility --- */
.container { max-width: 1240px; margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-sm { padding: 48px 0; }
.section-title {
  font-family: var(--font-head);
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 12px;
  line-height: 1.2;
}
.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-mid);
  margin-bottom: 48px;
  max-width: 580px;
}
.section-header { text-align: center; }
.section-header .section-subtitle { margin-left: auto; margin-right: auto; }
.text-accent { color: var(--accent); }
.text-white { color: #fff; }
.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 50px;
  font-size: .75rem;
  font-weight: 700;
  font-family: var(--font-head);
  letter-spacing: .5px;
  text-transform: uppercase;
}
.badge-accent { background: var(--accent); color: #fff; }
.badge-primary { background: var(--primary); color: #fff; }
.badge-outline { border: 2px solid var(--primary); color: var(--primary); background: transparent; }
.divider-accent {
  width: 56px; height: 4px;
  background: var(--accent);
  border-radius: 2px;
  margin: 16px 0 28px;
}
.divider-accent.center { margin: 16px auto 28px; }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: var(--radius);
  font-family: var(--font-head);
  font-size: .92rem;
  font-weight: 700;
  letter-spacing: .3px;
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.btn-primary:hover {
  background: var(--primary-light);
  border-color: var(--primary-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-accent {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-accent:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(240,165,0,.35);
}
.btn-outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}
.btn-outline:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-1px);
}
.btn-outline-white {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,.7);
}
.btn-outline-white:hover {
  background: rgba(255,255,255,.12);
  border-color: #fff;
}
.btn-lg { padding: 16px 36px; font-size: 1rem; }
.btn-sm { padding: 9px 20px; font-size: .82rem; }

/* ============================================
   HEADER / NAVBAR
   ============================================ */
#header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: var(--primary);
  box-shadow: 0 2px 16px rgba(0,0,0,.18);
  transition: var(--transition);
}
#header.scrolled {
  background: var(--primary-dark);
  box-shadow: 0 4px 24px rgba(0,0,0,.28);
}
.header-top {
  background: var(--primary-dark);
  padding: 7px 0;
  font-size: .8rem;
  color: rgba(255,255,255,.75);
}
.header-top .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.header-top a { color: rgba(255,255,255,.8); transition: var(--transition); }
.header-top a:hover { color: var(--accent); }
.header-top-links { display: flex; gap: 20px; align-items: center; }
.header-top-links i { margin-right: 5px; color: var(--accent); }
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0;
  height: 68px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}
.logo-icon {
  width: 44px; height: 44px;
  background: var(--accent);
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
  font-family: var(--font-head);
  font-weight: 800;
  color: var(--primary-dark);
  flex-shrink: 0;
}
.logo-text { line-height: 1.2; }
.logo-text strong {
  display: block;
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: .5px;
}
.logo-text span {
  display: block;
  font-size: .72rem;
  color: rgba(255,255,255,.65);
  letter-spacing: 1px;
  text-transform: uppercase;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-link {
  display: block;
  padding: 8px 14px;
  color: rgba(255,255,255,.88);
  font-family: var(--font-head);
  font-size: .88rem;
  font-weight: 600;
  border-radius: var(--radius);
  transition: var(--transition);
  position: relative;
}
.nav-link:hover, .nav-link.active {
  color: #fff;
  background: rgba(255,255,255,.1);
}
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px; left: 50%;
  transform: translateX(-50%);
  width: 18px; height: 3px;
  background: var(--accent);
  border-radius: 2px;
}
/* Dropdown */
.nav-item { position: relative; }
.nav-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 220px;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: var(--transition);
  overflow: hidden;
  border-top: 3px solid var(--accent);
}
.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.nav-dropdown a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 18px;
  color: var(--text-dark);
  font-size: .88rem;
  font-weight: 500;
  transition: var(--transition);
  border-bottom: 1px solid var(--border);
}
.nav-dropdown a:last-child { border-bottom: none; }
.nav-dropdown a:hover {
  background: var(--bg-light);
  color: var(--primary);
  padding-left: 24px;
}
.nav-dropdown a i {
  width: 18px;
  color: var(--accent);
  font-size: .85rem;
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}
.nav-search-btn {
  width: 38px; height: 38px;
  border-radius: var(--radius);
  background: rgba(255,255,255,.12);
  border: none;
  color: #fff;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: .95rem;
  transition: var(--transition);
}
.nav-search-btn:hover { background: rgba(255,255,255,.22); }
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 6px;
  background: none;
  border: none;
}
.hamburger span {
  display: block;
  width: 24px; height: 2.5px;
  background: #fff;
  border-radius: 2px;
  transition: var(--transition);
}

/* ============================================
   SEARCH OVERLAY
   ============================================ */
.search-overlay {
  position: fixed;
  inset: 0;
  background: rgba(6,33,53,.95);
  z-index: 2000;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 120px;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}
.search-overlay.open { opacity: 1; visibility: visible; }
.search-box {
  width: 100%;
  max-width: 720px;
  padding: 0 24px;
}
.search-box label {
  display: block;
  color: rgba(255,255,255,.6);
  font-family: var(--font-head);
  font-size: .85rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 20px;
}
.search-input-wrap {
  display: flex;
  align-items: center;
  background: rgba(255,255,255,.08);
  border: 2px solid rgba(255,255,255,.2);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}
.search-input-wrap:focus-within {
  border-color: var(--accent);
  background: rgba(255,255,255,.1);
}
.search-input-wrap input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  padding: 18px 24px;
  color: #fff;
  font-size: 1.35rem;
  font-family: var(--font-body);
}
.search-input-wrap input::placeholder { color: rgba(255,255,255,.4); }
.search-input-wrap button {
  padding: 0 24px;
  background: var(--accent);
  border: none;
  color: #fff;
  font-size: 1.1rem;
  cursor: pointer;
  height: 60px;
  transition: var(--transition);
}
.search-input-wrap button:hover { background: var(--accent-hover); }
.search-tags { margin-top: 20px; display: flex; gap: 10px; flex-wrap: wrap; }
.search-tag {
  padding: 6px 16px;
  background: rgba(255,255,255,.1);
  color: rgba(255,255,255,.75);
  border-radius: 50px;
  font-size: .82rem;
  cursor: pointer;
  transition: var(--transition);
}
.search-tag:hover { background: var(--accent); color: #fff; }
.search-close {
  position: absolute;
  top: 24px; right: 24px;
  background: none;
  border: none;
  color: rgba(255,255,255,.6);
  font-size: 1.5rem;
  cursor: pointer;
  transition: var(--transition);
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
}
.search-close:hover { color: #fff; background: rgba(255,255,255,.1); }

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  min-height: 100vh;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, #1a6b8a 100%);
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 100px;
}
.hero-bg-pattern {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 50%, rgba(240,165,0,.06) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255,255,255,.04) 0%, transparent 40%),
    url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
  width: 100%;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(240,165,0,.15);
  border: 1px solid rgba(240,165,0,.3);
  color: var(--accent);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: .8rem;
  font-family: var(--font-head);
  font-weight: 700;
  letter-spacing: .5px;
  text-transform: uppercase;
  margin-bottom: 20px;
}
.hero-badge i { font-size: .85rem; }
.hero-title {
  font-family: var(--font-head);
  font-size: 3.2rem;
  font-weight: 800;
  color: #fff;
  line-height: 1.15;
  margin-bottom: 20px;
}
.hero-title .highlight {
  color: var(--accent);
  position: relative;
}
.hero-desc {
  font-size: 1.05rem;
  color: rgba(255,255,255,.8);
  margin-bottom: 36px;
  line-height: 1.75;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 48px;
  padding-top: 36px;
  border-top: 1px solid rgba(255,255,255,.1);
}
.stat-item { text-align: center; }
.stat-number {
  display: block;
  font-family: var(--font-head);
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
}
.stat-label {
  font-size: .8rem;
  color: rgba(255,255,255,.65);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: .5px;
}
.hero-visual {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.hero-img-main {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  position: relative;
}
.hero-img-main img {
  width: 100%;
  height: 340px;
  object-fit: cover;
}
/* SVG placeholder for hero images */
.img-placeholder {
  background: linear-gradient(135deg, var(--primary-light), var(--primary-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,.2);
  font-size: 4rem;
}
.hero-img-main .img-placeholder { height: 340px; border-radius: var(--radius-lg); }
.hero-img-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.hero-img-sm {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.hero-img-sm .img-placeholder { height: 160px; border-radius: var(--radius); }
.hero-cert-badge {
  position: absolute;
  bottom: 16px; left: 16px;
  background: rgba(6,33,53,.88);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(240,165,0,.4);
  color: #fff;
  padding: 10px 16px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .82rem;
}
.hero-cert-badge i { color: var(--accent); font-size: 1.1rem; }
.hero-cert-badge strong { display: block; font-family: var(--font-head); font-size: .9rem; }

/* Search Widget on Hero */
.hero-search {
  background: rgba(255,255,255,.07);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-top: 32px;
}
.hero-search h4 {
  color: rgba(255,255,255,.8);
  font-family: var(--font-head);
  font-size: .82rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 14px;
}
.search-grid { display: grid; grid-template-columns: 1fr 1fr 1fr auto; gap: 10px; }
.search-select {
  padding: 11px 14px;
  border-radius: var(--radius);
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.2);
  color: #fff;
  font-size: .87rem;
  outline: none;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
}
.search-select option { background: var(--primary-dark); color: #fff; }
.search-select:focus { border-color: var(--accent); }

/* ============================================
   MARQUEE / PARTNER LOGOS
   ============================================ */
.marquee-section {
  background: var(--bg-light);
  padding: 20px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}
.marquee-track {
  display: flex;
  gap: 48px;
  animation: marquee 28s linear infinite;
  white-space: nowrap;
}
.marquee-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-head);
  font-size: .82rem;
  font-weight: 700;
  color: var(--text-light);
  letter-spacing: 1px;
  text-transform: uppercase;
  flex-shrink: 0;
}
.marquee-item i { color: var(--accent); font-size: 1rem; }
@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ============================================
   PRODUCT CATEGORIES
   ============================================ */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.cat-card {
  background: var(--bg-white);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.cat-card::before {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 4px;
  background: var(--accent);
  transform: scaleX(0);
  transition: var(--transition);
}
.cat-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}
.cat-card:hover::before { transform: scaleX(1); }
.cat-icon {
  width: 72px; height: 72px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.75rem;
  color: var(--accent);
  margin: 0 auto 20px;
  transition: var(--transition);
}
.cat-card:hover .cat-icon {
  background: var(--accent);
  color: #fff;
  transform: scale(1.08) rotate(-5deg);
}
.cat-card h3 {
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
}
.cat-card p { font-size: .87rem; color: var(--text-mid); line-height: 1.6; }
.cat-card .cat-count {
  display: inline-block;
  margin-top: 14px;
  padding: 4px 12px;
  background: var(--bg-light);
  border-radius: 50px;
  font-size: .78rem;
  font-weight: 600;
  color: var(--text-mid);
}

/* ============================================
   FEATURED PRODUCTS
   ============================================ */
.prod-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.prod-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  height: 100%;          /* Kéo dài bằng nhau trong cùng hàng grid */
}
.prod-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-color: rgba(10,61,98,.2);
}
.prod-img {
  position: relative;
  overflow: hidden;
  height: 200px;
  background: #f7f9fc;
  display: flex; align-items: center; justify-content: center;
  font-size: 2.8rem;
}
.prod-img img {
  width: 100%;
  height: 200px;
  object-fit: contain;
  padding: 12px;
}
.prod-tag {
  position: absolute;
  top: 8px; left: 8px;
}
.prod-tag.badge { font-size: .68rem; padding: 3px 9px; }
.prod-body {
  padding: 14px 16px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.prod-body h4 {
  font-family: var(--font-head);
  font-size: .95rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 5px;
  line-height: 1.35;
  min-height: calc(1.35em * 2);  /* Luôn cao 2 dòng */
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.prod-body p {
  font-size: .84rem;
  color: var(--text-mid);
  line-height: 1.55;
  flex: 1;                        /* Đẩy meta + footer xuống đáy */
  margin-bottom: 8px;
  min-height: calc(1.55em * 2);  /* Luôn cao 2 dòng */
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.prod-meta {
  display: flex;
  gap: 6px;
  flex-wrap: nowrap;             /* Không xuống dòng → chiều cao cố định */
  margin-bottom: 8px;
  min-height: 22px;
  overflow: hidden;
}
.prod-meta span {
  display: flex;
  align-items: center;
  gap: 3px;
  font-size: .7rem;
  color: var(--text-light);
}
.prod-meta span i { color: var(--accent); font-size: .68rem; }
.prod-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 6px;
}
.prod-footer .btn { flex: 1; justify-content: center; padding: 10px 12px; font-size: .84rem; }

/* ============================================
   FILTER BAR
   ============================================ */
.filter-bar {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin-bottom: 36px;
  box-shadow: var(--shadow-sm);
}
.filter-bar-title {
  font-family: var(--font-head);
  font-size: .8rem;
  font-weight: 700;
  color: var(--text-mid);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.filter-bar-title i { color: var(--accent); }
.filter-groups { display: flex; gap: 32px; flex-wrap: wrap; align-items: flex-end; }
.filter-group { flex: 1; min-width: 160px; }
.filter-group label {
  display: block;
  font-size: .8rem;
  font-weight: 600;
  color: var(--text-mid);
  margin-bottom: 6px;
  font-family: var(--font-head);
}
.filter-select {
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--radius);
  border: 1.5px solid var(--border);
  color: var(--text-dark);
  font-size: .88rem;
  background: var(--bg-white);
  outline: none;
  transition: var(--transition);
  cursor: pointer;
}
.filter-select:focus { border-color: var(--primary); }
.filter-chips { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
.filter-chip {
  padding: 5px 14px;
  border-radius: 50px;
  font-size: .8rem;
  font-weight: 600;
  cursor: pointer;
  border: 1.5px solid var(--border);
  color: var(--text-mid);
  transition: var(--transition);
  font-family: var(--font-head);
}
.filter-chip.active, .filter-chip:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* ============================================
   PROJECTS / PORTFOLIO
   ============================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.project-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  background: var(--primary-dark);
}
.project-card .img-placeholder { height: 280px; font-size: 3rem; }
.project-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(6,33,53,.92) 0%, rgba(6,33,53,.2) 60%, transparent 100%);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  transition: var(--transition);
}
.project-card:hover .project-overlay {
  background: linear-gradient(to top, rgba(6,33,53,.97) 0%, rgba(6,33,53,.6) 60%, rgba(6,33,53,.2) 100%);
}
.project-tag {
  position: absolute;
  top: 16px; left: 16px;
}
.project-title {
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
}
.project-sub { font-size: .83rem; color: rgba(255,255,255,.7); }
.project-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  font-size: .82rem;
  font-family: var(--font-head);
  color: var(--accent);
  opacity: 0;
  transform: translateY(8px);
  transition: var(--transition);
}
.project-card:hover .project-card-link { opacity: 1; transform: translateY(0); }

/* ============================================
   CERTS / TRUST BADGES
   ============================================ */
.certs-section { background: var(--primary); }
.cert-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.cert-item {
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  text-align: center;
  transition: var(--transition);
}
.cert-item:hover {
  background: rgba(255,255,255,.12);
  transform: translateY(-3px);
}
.cert-icon {
  font-size: 2.2rem;
  color: var(--accent);
  margin-bottom: 12px;
}
.cert-item h4 {
  font-family: var(--font-head);
  font-size: .95rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 6px;
}
.cert-item p { font-size: .82rem; color: rgba(255,255,255,.65); line-height: 1.5; }

/* ============================================
   WHY US
   ============================================ */
.why-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.why-visual { position: relative; }
.why-visual .img-placeholder {
  height: 480px;
  border-radius: var(--radius-lg);
  font-size: 4rem;
}
.why-badge-float {
  position: absolute;
  bottom: -20px; right: -20px;
  background: var(--accent);
  color: #fff;
  padding: 20px 24px;
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-md);
}
.why-badge-float strong {
  display: block;
  font-family: var(--font-head);
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
}
.why-badge-float span { font-size: .8rem; opacity: .9; }
.why-features { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 28px; }
.why-feature {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.why-feature-icon {
  width: 44px; height: 44px;
  background: rgba(10,61,98,.08);
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
  color: var(--primary);
  flex-shrink: 0;
}
.why-feature h4 {
  font-family: var(--font-head);
  font-size: .93rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 3px;
}
.why-feature p { font-size: .82rem; color: var(--text-mid); line-height: 1.55; }

/* ============================================
   CTA SECTION
   ============================================ */
.cta-section {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.cta-content {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: center;
}
.cta-content h2 {
  font-family: var(--font-head);
  font-size: 2.1rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 10px;
}
.cta-content p { color: rgba(255,255,255,.75); font-size: 1rem; }
.cta-actions { display: flex; gap: 14px; flex-shrink: 0; }

/* ============================================
   FOOTER
   ============================================ */
footer {
  background: var(--primary-dark);
  color: rgba(255,255,255,.8);
}
.footer-main {
  padding: 64px 0 40px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
}
.footer-brand p {
  font-size: .88rem;
  color: rgba(255,255,255,.6);
  line-height: 1.75;
  margin: 16px 0 24px;
}
.footer-socials { display: flex; gap: 10px; }
.footer-social {
  width: 38px; height: 38px;
  border-radius: var(--radius);
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.1);
  display: flex; align-items: center; justify-content: center;
  color: rgba(255,255,255,.7);
  font-size: .95rem;
  transition: var(--transition);
}
.footer-social:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
.footer-col h4 {
  font-family: var(--font-head);
  font-size: .87rem;
  font-weight: 700;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}
.footer-links li { margin-bottom: 10px; }
.footer-links a {
  font-size: .87rem;
  color: rgba(255,255,255,.6);
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 7px;
}
.footer-links a i { font-size: .7rem; color: var(--accent); }
.footer-links a:hover { color: #fff; padding-left: 4px; }
.footer-contact-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin-bottom: 14px;
}
.footer-contact-item i {
  color: var(--accent);
  font-size: .95rem;
  margin-top: 2px;
  width: 16px;
  flex-shrink: 0;
}
.footer-contact-item span { font-size: .87rem; color: rgba(255,255,255,.65); line-height: 1.55; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: .82rem;
  color: rgba(255,255,255,.45);
}
.footer-bottom a { color: rgba(255,255,255,.55); transition: var(--transition); }
.footer-bottom a:hover { color: var(--accent); }

/* ============================================
   PAGE HERO (Inner Pages)
   ============================================ */
.page-hero {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  padding: 120px 0 60px;
  position: relative;
  overflow: hidden;
}
.page-hero::after {
  display: none;
}
.page-hero .container { position: relative; z-index: 1; }
.page-hero h1 {
  font-family: var(--font-head);
  font-size: 2.8rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 10px;
}
.page-hero p { color: rgba(255,255,255,.75); font-size: 1.05rem; }
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-size: .83rem;
  color: rgba(255,255,255,.55);
}
.breadcrumb a { color: rgba(255,255,255,.65); transition: var(--transition); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb i { font-size: .6rem; }

/* ============================================
   PRODUCT DETAIL
   ============================================ */
.product-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}
.product-gallery { position: sticky; top: 90px; }
.product-main-img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 16px;
  background: var(--bg-light);
}
.product-main-img .img-placeholder { height: 400px; font-size: 5rem; }
.product-thumbs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.product-thumb {
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--transition);
  background: var(--bg-light);
}
.product-thumb.active, .product-thumb:hover { border-color: var(--primary); }
.product-thumb .img-placeholder { height: 72px; font-size: 1.5rem; }
.product-info-title {
  font-family: var(--font-head);
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 6px;
}
.product-info-code {
  font-size: .85rem;
  color: var(--text-light);
  margin-bottom: 18px;
}
.product-info-code span { color: var(--primary); font-weight: 600; }
.product-rating { display: flex; align-items: center; gap: 8px; margin-bottom: 24px; }
.stars { color: var(--accent); font-size: .9rem; letter-spacing: 2px; }
.rating-text { font-size: .83rem; color: var(--text-mid); }
.product-desc {
  font-size: .93rem;
  color: var(--text-mid);
  line-height: 1.8;
  margin-bottom: 28px;
}
.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 28px;
  font-size: .88rem;
}
.spec-table tr { border-bottom: 1px solid var(--border); }
.spec-table td:first-child {
  font-weight: 600;
  color: var(--text-dark);
  padding: 10px 0;
  width: 40%;
  font-family: var(--font-head);
  font-size: .83rem;
}
.spec-table td:last-child {
  color: var(--text-mid);
  padding: 10px 0 10px 16px;
}
.color-swatches { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 28px; }
.color-swatch {
  width: 36px; height: 36px;
  border-radius: 50%;
  cursor: pointer;
  border: 3px solid transparent;
  transition: var(--transition);
  box-shadow: 0 2px 6px rgba(0,0,0,.2);
}
.color-swatch:hover, .color-swatch.active { border-color: var(--primary); transform: scale(1.15); }
.quote-form-box {
  background: var(--bg-light);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-top: 32px;
}
.quote-form-box h4 {
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 4px;
}
.quote-form-box p { font-size: .83rem; color: var(--text-mid); margin-bottom: 20px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 14px; }
.form-group { margin-bottom: 14px; }
.form-group label {
  display: block;
  font-size: .82rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 6px;
  font-family: var(--font-head);
}
.form-control {
  width: 100%;
  padding: 11px 14px;
  border-radius: var(--radius);
  border: 1.5px solid var(--border);
  color: var(--text-dark);
  font-size: .88rem;
  font-family: var(--font-body);
  background: var(--bg-white);
  outline: none;
  transition: var(--transition);
}
.form-control:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(10,61,98,.08); }
textarea.form-control { resize: vertical; min-height: 90px; }
.download-docs {
  background: var(--bg-white);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-top: 24px;
}
.download-docs h4 {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 16px;
}
.doc-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border-radius: var(--radius);
  transition: var(--transition);
  cursor: pointer;
}
.doc-item:hover { background: var(--bg-light); }
.doc-icon {
  width: 40px; height: 40px;
  background: rgba(10,61,98,.08);
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
  color: var(--primary);
  flex-shrink: 0;
}
.doc-item h5 {
  font-family: var(--font-head);
  font-size: .87rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 2px;
}
.doc-item p { font-size: .77rem; color: var(--text-light); }
.doc-download-btn {
  margin-left: auto;
  width: 32px; height: 32px;
  border-radius: var(--radius);
  background: var(--primary);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: .8rem;
  transition: var(--transition);
  flex-shrink: 0;
}
.doc-download-btn:hover { background: var(--accent); }

/* Tabs */
.tabs-nav {
  display: flex;
  border-bottom: 2px solid var(--border);
  margin-bottom: 28px;
  gap: 4px;
}
.tab-btn {
  padding: 11px 22px;
  font-family: var(--font-head);
  font-size: .88rem;
  font-weight: 700;
  color: var(--text-mid);
  border: none;
  background: none;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: var(--transition);
}
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); }
.tab-btn:hover:not(.active) { color: var(--primary); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ============================================
   CONTACT PAGE
   ============================================ */
.contact-grid { display: grid; grid-template-columns: 1fr 1.5fr; gap: 48px; }
.contact-info-card {
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 40px;
}
.contact-info-card h3 {
  font-family: var(--font-head);
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 8px;
}
.contact-info-card p {
  font-size: .9rem;
  color: rgba(255,255,255,.7);
  margin-bottom: 32px;
  line-height: 1.7;
}
.contact-detail {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(255,255,255,.12);
}
.contact-detail:last-of-type { border-bottom: none; }
.contact-detail-icon {
  width: 46px; height: 46px;
  background: rgba(255,255,255,.1);
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
  color: var(--accent);
  flex-shrink: 0;
}
.contact-detail h4 {
  font-family: var(--font-head);
  font-size: .88rem;
  font-weight: 700;
  margin-bottom: 3px;
  color: rgba(255,255,255,.9);
}
.contact-detail p { font-size: .85rem; color: rgba(255,255,255,.65); line-height: 1.6; }
.contact-form-box {
  background: var(--bg-white);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-sm);
}
.contact-form-box h3 {
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 6px;
}
.contact-form-box p { font-size: .9rem; color: var(--text-mid); margin-bottom: 28px; }

/* ============================================
   SUPPORT PAGE
   ============================================ */
.support-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px; }
.support-card {
  background: var(--bg-white);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition);
}
.support-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}
.support-card-icon {
  width: 60px; height: 60px;
  background: rgba(10,61,98,.07);
  border-radius: var(--radius-lg);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  color: var(--primary);
  margin-bottom: 20px;
  transition: var(--transition);
}
.support-card:hover .support-card-icon { background: var(--primary); color: var(--accent); }
.support-card h3 {
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 10px;
}
.support-card p { font-size: .87rem; color: var(--text-mid); line-height: 1.65; }
.faq-item {
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 22px;
  cursor: pointer;
  font-family: var(--font-head);
  font-size: .95rem;
  font-weight: 600;
  color: var(--primary);
  transition: var(--transition);
}
.faq-question:hover { background: var(--bg-light); }
.faq-question.open { background: var(--primary); color: #fff; }
.faq-icon { width: 24px; height: 24px; flex-shrink: 0; transition: var(--transition); font-size: .9rem; }
.faq-question.open .faq-icon { transform: rotate(45deg); }
.faq-answer {
  padding: 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease, padding .35s ease;
  font-size: .88rem;
  color: var(--text-mid);
  line-height: 1.7;
}
.faq-answer.open { padding: 18px 22px; max-height: 300px; }

/* ============================================
   TOAST / NOTIFICATION
   ============================================ */
.toast {
  position: fixed;
  bottom: 32px; right: 32px;
  background: var(--primary-dark);
  color: #fff;
  padding: 14px 22px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: .9rem;
  z-index: 9999;
  transform: translateY(80px);
  opacity: 0;
  transition: var(--transition);
  border-left: 4px solid var(--accent);
}
.toast.show { transform: translateY(0); opacity: 1; }
.toast i { color: var(--accent); font-size: 1.1rem; }

/* ============================================
   SCROLL TO TOP
   ============================================ */
.scroll-top {
  position: fixed;
  bottom: 32px; right: 32px;
  width: 46px; height: 46px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: var(--transition);
  z-index: 900;
}
.scroll-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.scroll-top:hover { background: var(--accent); }

/* ============================================
   FLOAT CONTACT BUTTONS (Zalo + Phone)
   ============================================ */
.float-contact {
  position: fixed;
  bottom: 28px;
  right: 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 9999;
}
.float-btn {
  position: relative;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: 0 4px 18px rgba(0,0,0,.28);
  transition: transform .2s;
  text-decoration: none;
  border: none;
}
.float-btn:hover { transform: scale(1.12); }
.float-zalo  { background: #0068ff; color: #fff; }
.float-phone { background: #27ae60; color: #fff; }
.float-label {
  position: absolute;
  right: 62px;
  background: rgba(0,0,0,.78);
  color: #fff;
  padding: 5px 12px;
  border-radius: 6px;
  font-size: .75rem;
  font-weight: 600;
  white-space: nowrap;
  opacity: 0;
  transition: opacity .2s;
  pointer-events: none;
}
.float-btn:hover .float-label { opacity: 1; }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1100px) {
  .prod-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
  .cert-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-title { font-size: 2.4rem; }
  .hero-visual { display: none; }
  .cat-grid { grid-template-columns: repeat(2, 1fr); }
  .prod-grid { grid-template-columns: repeat(2, 1fr); }
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
  .why-grid { grid-template-columns: 1fr; }
  .why-visual { display: none; }
  .contact-grid { grid-template-columns: 1fr; }
  .product-detail-grid { grid-template-columns: 1fr; }
  .cta-content { grid-template-columns: 1fr; }
  .cta-actions { flex-direction: row; }
  .search-grid { grid-template-columns: 1fr 1fr; }
  .support-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .section { padding: 56px 0; }
  .section-title { font-size: 1.65rem; }
  .hero-title { font-size: 2rem; }
  .hero-stats { gap: 20px; }
  .cat-grid { grid-template-columns: 1fr; }
  .prod-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .cert-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .form-row { grid-template-columns: 1fr; }
  .header-top { display: none; }
  .nav-menu { display: none; }
  .nav-menu.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 68px; left: 0; right: 0;
    background: var(--primary-dark);
    padding: 20px;
    box-shadow: var(--shadow-lg);
    gap: 4px;
    z-index: 999;
  }
  .hamburger { display: flex; }
  .search-grid { grid-template-columns: 1fr; }
  .support-grid { grid-template-columns: 1fr; }
  .filter-groups { flex-direction: column; gap: 16px; }
  .why-features { grid-template-columns: 1fr; }
}

/* ============================================
   MÁY TÍNH SƠN (Paint Calculator)
   ============================================ */
.calc-box {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  margin-top: 28px;
  color: #fff;
}
.calc-box h4 {
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 800;
  margin-bottom: 4px;
  display: flex; align-items: center; gap: 10px;
}
.calc-box h4 i { color: var(--accent); }
.calc-box .calc-sub {
  font-size: .82rem;
  color: rgba(255,255,255,.7);
  margin-bottom: 20px;
}
.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr auto;
  gap: 12px;
  align-items: flex-end;
}
.calc-field label {
  display: block;
  font-size: .75rem;
  font-family: var(--font-head);
  font-weight: 700;
  color: rgba(255,255,255,.75);
  letter-spacing: .5px;
  text-transform: uppercase;
  margin-bottom: 6px;
}
.calc-input {
  width: 100%;
  padding: 11px 14px;
  border-radius: var(--radius);
  border: 1.5px solid rgba(255,255,255,.25);
  background: rgba(255,255,255,.1);
  color: #fff;
  font-size: .92rem;
  font-family: var(--font-body);
  outline: none;
  transition: var(--transition);
}
.calc-input:focus { border-color: var(--accent); background: rgba(255,255,255,.15); }
.calc-input::placeholder { color: rgba(255,255,255,.4); }
.calc-result-box {
  background: rgba(255,255,255,.1);
  border: 1.5px solid rgba(255,255,255,.2);
  border-radius: var(--radius);
  padding: 14px 20px;
  margin-top: 18px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.calc-result-item { text-align: center; }
.calc-result-val {
  font-family: var(--font-head);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  display: block;
}
.calc-result-lbl {
  font-size: .72rem;
  color: rgba(255,255,255,.65);
  text-transform: uppercase;
  letter-spacing: .5px;
  margin-top: 3px;
  display: block;
}
.calc-formula {
  font-size: .78rem;
  color: rgba(255,255,255,.7);
  line-height: 1.75;
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid rgba(255,255,255,.15);
}
.calc-formula code {
  background: rgba(255,255,255,.12);
  color: var(--accent);
  font-size: .95em;
  padding: 2px 7px;
  border-radius: 5px;
  white-space: nowrap;
}

/* ============================================
   LIÊN KẾT TRONG THÂN BÀI VIẾT
   (chỉ áp dụng trong .article-content — không ảnh
   hưởng menu, footer, thẻ bài, nút bấm)
   ============================================ */
.article-content p > a:not(.btn),
.article-content li > a:not(.btn),
.article-content td a:not(.btn),
.article-content h2 > a:not(.btn),
.article-content h3 > a:not(.btn) {
  color: #0b6cb8;
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: rgba(11,108,184,.38);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
  border-radius: 3px;
  padding: 0 1px;
  transition: color .18s ease, background-color .18s ease, text-decoration-color .18s ease;
}
.article-content p > a:not(.btn):hover,
.article-content li > a:not(.btn):hover,
.article-content td a:not(.btn):hover,
.article-content h2 > a:not(.btn):hover,
.article-content h3 > a:not(.btn):hover {
  color: var(--primary);
  background: rgba(240,165,0,.18);
  text-decoration-color: var(--accent);
}

/* Liên kết trên nền tối: chú thích ảnh và khối định nghĩa */
.article-content .img-caption a,
.article-content .def-box p > a {
  color: var(--accent);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: rgba(240,165,0,.45);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
  background: none;
  transition: color .18s ease, text-decoration-color .18s ease;
}
.article-content .img-caption a:hover,
.article-content .def-box p > a:hover {
  color: #ffc94d;
  background: none;
  text-decoration-color: #ffc94d;
}