/* SONOTEC Việt Nam — theme theo nhận diện chính thức sonotec.eu
   Đỏ SONOTEC #E73439 · chữ #496471 · heading Bai Jamjuree · thân Inter */
:root {
  --red: #e73439;
  --red-dark: #c92328;
  --ink: #496471;
  --ink-strong: #2e4350;
  --muted: #7a8c98;
  --line: #dde4ea;
  --line-strong: #c3cfd9;
  --hero-bg: #e0e7f0;
  --soft: #f6f6f6;
  --soft-blue: #eef3f8;
  --white: #ffffff;
  --shadow: 0 12px 32px rgba(46, 67, 80, 0.10);
  --shadow-tight: 0 6px 18px rgba(46, 67, 80, 0.08);
  --radius: 4px;
  --container: 1180px;
  --font-head: "Bai Jamjuree", "Inter", sans-serif;
  --font-body: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  background: var(--white);
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button, input, textarea, select { font: inherit; }

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 600;
  line-height: 1.22;
  letter-spacing: -0.012em;
  color: var(--ink-strong);
  margin: 0 0 16px;
}
h1 { font-size: clamp(1.9rem, 3.6vw, 2.7rem); }
h2 { font-size: clamp(1.5rem, 2.6vw, 2rem); }
h3 { font-size: 1.12rem; color: var(--ink-strong); }
h3 a:hover { color: var(--red); }
p { margin: 0 0 14px; }

.container, .header-inner, .footer-inner {
  width: min(var(--container), calc(100% - 40px));
  margin: 0 auto;
}

/* ---------- topbar ---------- */
.topbar { background: var(--ink-strong); color: #b9c7d1; font-size: 0.8rem; }
.topbar-inner {
  width: min(var(--container), calc(100% - 40px));
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  padding: 7px 0;
  letter-spacing: 0.02em;
}
.topbar-links { display: flex; gap: 22px; }
.topbar a { color: #ffffff; font-weight: 500; }
.topbar a:hover { text-decoration: underline; }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--white);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px 0;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  background: var(--red);
  color: #fff;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.5rem;
  border-radius: var(--radius);
}
.brand-name {
  display: block;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.22rem;
  letter-spacing: 0.06em;
  color: var(--red);
  text-transform: uppercase;
}
.brand-sub {
  display: block;
  font-size: 0.76rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}
.nav { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
.nav > a, .nav-dropdown summary {
  padding: 9px 13px;
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}
.nav > a:hover, .nav-dropdown summary:hover { color: var(--red); background: var(--soft-blue); }
.nav > a.active { color: var(--red); font-weight: 600; }
.nav-dropdown { position: relative; }
.nav-dropdown summary::-webkit-details-marker { display: none; }
.nav-dropdown summary::after { content: " ▾"; font-size: 0.7em; color: var(--muted); }
.nav-dropdown-panel {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 330px;
  background: var(--white);
  border: 1px solid var(--line);
  border-top: 3px solid var(--red);
  border-radius: 0 0 var(--radius) var(--radius);
  box-shadow: var(--shadow);
  padding: 8px;
  display: grid;
  gap: 2px;
  z-index: 60;
}
.menu-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 10px;
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 0.93rem;
}
.menu-link:hover { background: var(--soft-blue); color: var(--red); }
.menu-thumb {
  flex: 0 0 46px;
  width: 46px;
  height: 46px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  display: grid;
  place-items: center;
  overflow: hidden;
}
.menu-thumb img { max-height: 40px; width: auto; }
.nav-cta {
  margin-left: 8px;
  background: var(--red);
  color: #fff !important;
  font-weight: 600;
  padding: 10px 18px !important;
  border-radius: var(--radius);
}
.nav-cta:hover { background: var(--red-dark) !important; color: #fff !important; }

/* ---------- buttons ---------- */
.button {
  display: inline-block;
  padding: 12px 22px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.97rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.button-primary { background: var(--red); color: #fff; }
.button-primary:hover { background: var(--red-dark); }
.button-secondary {
  background: var(--white);
  color: var(--ink-strong);
  border-color: var(--line-strong);
}
.button-secondary:hover { border-color: var(--red); color: var(--red); }

/* ---------- hero ---------- */
.hero {
  background:
    linear-gradient(90deg, var(--hero-bg) 0%, var(--hero-bg) 46%, rgba(224, 231, 240, 0.55) 72%, rgba(224, 231, 240, 0.18) 100%),
    var(--hero-image, none) right center / cover no-repeat,
    var(--hero-bg);
  border-bottom: 1px solid var(--line);
}
.hero-inner { padding: 88px 0; }
.hero-copy { max-width: 640px; }
.eyebrow {
  font-family: var(--font-head);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--ink-strong);
  margin-bottom: 12px;
}
.hero h1 { color: var(--ink-strong); }
.lead { font-size: 1.07rem; line-height: 1.7; color: var(--ink); }
.hero .lead { color: var(--ink-strong); }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 18px; }

/* search panel */
.search-panel {
  position: relative;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 18px 0 6px;
  max-width: 620px;
}
.search-panel input[type="search"] {
  flex: 1 1 300px;
  padding: 12px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: #fff;
  color: var(--ink-strong);
}
.search-panel input[type="search"]:focus {
  outline: 2px solid rgba(231, 52, 57, 0.35);
  border-color: var(--red);
}
.search-note { font-size: 0.85rem; color: var(--muted); flex-basis: 100%; }
.search-note a { color: var(--red); }
.hero-ac {
  position: absolute;
  left: 0; right: 0; top: 100%;
  z-index: 40;
  background: #fff;
  border: 1px solid var(--line-strong);
  border-top: none;
  border-radius: 0 0 var(--radius) var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  display: none;
}
.hero-ac.on { display: block; }
.hero-ac a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--soft-blue);
  font-size: 0.93rem;
}
.hero-ac a:last-child { border-bottom: none; }
.hero-ac a:hover, .hero-ac a.hl { background: var(--soft-blue); }
.hero-ac .code { font-weight: 700; color: var(--red); font-family: var(--font-head); }
.hero-ac .mt { color: var(--muted); font-size: 0.8rem; margin-left: auto; white-space: nowrap; }

/* ---------- metric strip ---------- */
.metric-strip { background: var(--ink-strong); color: #fff; }
.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  padding: 30px 0;
}
.metric strong {
  display: block;
  font-family: var(--font-head);
  font-size: 1.02rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 3px;
}
.metric span { font-size: 0.84rem; color: #c6d2db; line-height: 1.45; }

/* ---------- sections ---------- */
.section { padding: 80px 0; }
.section-soft { background: var(--soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-heading { max-width: 760px; margin-bottom: 42px; }
.section-heading.center { margin-left: auto; margin-right: auto; text-align: center; }
.kicker {
  font-family: var(--font-head);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--red);
  margin-bottom: 10px;
}
.section-heading:not(.center) .kicker::before {
  content: "";
  display: inline-block;
  width: 26px;
  height: 2px;
  background: var(--red);
  margin-right: 10px;
  vertical-align: middle;
}
.section-heading.center .kicker::after {
  content: "";
  display: block;
  width: 44px;
  height: 3px;
  background: var(--red);
  margin: 10px auto 0;
}

/* ---------- grids & cards ---------- */
.grid { display: grid; gap: 22px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: var(--white);
  border: 1px solid #e8edf2;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(46, 67, 80, 0.05);
  transition: box-shadow 0.22s ease, border-color 0.22s ease, transform 0.22s ease;
}
.card:hover { box-shadow: var(--shadow); border-color: var(--line-strong); transform: translateY(-3px); }

.category-card h3, .category-card p { padding: 0 18px; }
.category-card h3 { margin-top: 16px; }
.category-card p:last-child, .category-card .meta-line { padding-bottom: 16px; margin-bottom: 0; }
.category-media {
  display: grid;
  place-items: center;
  background: #fff;
  border-bottom: 3px solid var(--red);
  height: 190px;
  padding: 14px;
}
.category-media img { max-height: 160px; width: auto; }

.product-grid .product-card { display: flex; flex-direction: column; }
.product-media {
  display: grid;
  place-items: center;
  height: 170px;
  padding: 14px;
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.product-media img { max-height: 140px; width: auto; }
.product-body { padding: 14px 16px 16px; display: flex; flex-direction: column; gap: 4px; }
.product-body h3 { font-size: 0.99rem; margin-bottom: 2px; }
.product-body p { font-size: 0.87rem; margin: 0; color: var(--ink); }
.meta-line {
  font-family: var(--font-head);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--red);
  text-transform: uppercase;
}
.meta-line a { color: var(--red); }
.meta-line a:hover { text-decoration: underline; }

.step-card { padding: 20px; }
.step-number {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.6rem;
  color: var(--red);
  margin-bottom: 6px;
}
.step-card h3 { margin-bottom: 8px; }
.step-card p { font-size: 0.92rem; margin-bottom: 8px; }

/* ---------- split & panels ---------- */
.split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 40px;
  align-items: start;
}
.check-list { list-style: none; margin: 0 0 18px; padding: 0; display: grid; gap: 10px; }
.check-list li { padding-left: 28px; position: relative; }
.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--red);
  font-weight: 700;
}
.check-list a { color: var(--red); }
.quote-panel {
  background: var(--soft-blue);
  border: 1px solid var(--line);
  border-left: 4px solid var(--red);
  border-radius: var(--radius);
  padding: 20px 22px;
}
.quote-panel > strong {
  display: block;
  font-family: var(--font-head);
  font-size: 1.05rem;
  color: var(--ink-strong);
  margin-bottom: 10px;
}
.quote-list { list-style: none; margin: 0 0 6px; padding: 0; display: grid; gap: 8px; font-size: 0.93rem; }
.quote-list li { padding-left: 22px; position: relative; }
.quote-list li::before { content: "›"; position: absolute; left: 4px; color: var(--red); font-weight: 700; }
.quote-list a { color: var(--red); font-weight: 600; }
.quote-panel .hero-actions { margin-top: 14px; }

/* ---------- breadcrumb & chips ---------- */
.breadcrumb { font-size: 0.85rem; color: var(--muted); margin-bottom: 18px; }
.breadcrumb a:hover { color: var(--red); }
.breadcrumb span[aria-hidden] { margin: 0 4px; }
.spec-cloud { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.spec-cloud a {
  padding: 7px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 0.87rem;
  font-weight: 500;
  background: #fff;
}
.spec-cloud a:hover { border-color: var(--red); color: var(--red); }

/* ---------- tables ---------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 26px;
  background: #fff;
}
.product-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.product-table th, .product-table td {
  text-align: left;
  padding: 11px 14px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.product-table tbody tr:last-child td { border-bottom: none; }
.product-table tbody tr:nth-child(odd) { background: var(--soft); }
.product-table strong { color: var(--ink-strong); font-weight: 600; }
.product-table td:first-child { width: 34%; min-width: 180px; }

/* ---------- gallery & lightbox ---------- */
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}
.gallery-item {
  display: grid;
  place-items: center;
  background: #fff;
  border: 1px solid #e8edf2;
  border-radius: var(--radius);
  padding: 10px;
  height: 200px;
  overflow: hidden;
  cursor: zoom-in;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}
.gallery-item:hover { box-shadow: var(--shadow-tight); border-color: var(--line-strong); }
.gallery-item img { max-height: 180px; width: auto; max-width: 100%; }
.lightbox-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(28, 40, 48, 0.9);
  display: grid;
  place-items: center;
  padding: 30px;
  cursor: zoom-out;
}
.lightbox-overlay img {
  max-width: min(1100px, 94vw);
  max-height: 88vh;
  background: #fff;
  border-radius: var(--radius);
  padding: 10px;
}
.lightbox-caption {
  position: fixed;
  left: 0; right: 0; bottom: 14px;
  text-align: center;
  color: #d7e0e7;
  font-size: 0.88rem;
  padding: 0 30px;
}

/* ---------- footer ---------- */
.site-footer { background: var(--ink-strong); color: #ffffff; margin-top: 40px; }
.footer-inner { padding: 46px 0 26px; }
.footer-kicker {
  font-family: var(--font-head);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  color: #aebfca;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  padding-bottom: 14px;
  margin-bottom: 26px;
}
.footer-main {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.1fr;
  gap: 32px;
  padding-bottom: 26px;
}
.footer-column h3 {
  color: #fff;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}
.footer-column p { color: #c6d2db; font-size: 0.9rem; }
.footer-logo { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.footer-logo-title {
  display: block;
  font-family: var(--font-head);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: #fff;
  text-transform: uppercase;
}
.footer-logo-sub { display: block; font-size: 0.76rem; color: #aebfca; }
.footer-company { display: grid; gap: 3px; font-size: 0.85rem; color: #c6d2db; }
.footer-company strong { color: #fff; }
.footer-fastgroup:hover { color: var(--red); text-decoration: underline; }
.footer-links { display: grid; gap: 8px; font-size: 0.9rem; }
.footer-links a { color: #c6d2db; }
.footer-links a:hover { color: #fff; text-decoration: underline; }
.footer-contact { display: grid; gap: 12px; font-size: 0.9rem; }
.footer-contact span {
  display: block;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #8fa3b0;
  margin-bottom: 2px;
}
.footer-contact p, .footer-contact a { color: #e2e9ee; margin: 0; }
.footer-contact a:hover { color: #fff; text-decoration: underline; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  padding-top: 16px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 0.8rem;
  color: #8fa3b0;
}

/* ---------- forms ---------- */
label { display: grid; gap: 6px; font-weight: 500; font-size: 0.93rem; color: var(--ink-strong); }
input[type="text"], input[type="search"], input[type="email"], textarea {
  font-weight: 400;
  color: var(--ink-strong);
}

/* ---------- responsive ---------- */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .metrics { grid-template-columns: repeat(2, 1fr); }
  .footer-main { grid-template-columns: 1fr 1fr; }
  .split { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .grid-4, .grid-3 { grid-template-columns: 1fr; }
  .metrics { grid-template-columns: 1fr; }
  .footer-main { grid-template-columns: 1fr; }
  .hero-inner { padding: 48px 0; }
  .hero { background: var(--hero-bg); }
  .topbar-inner > span:first-child { display: none; }
}

/* ---------- mobile / tablet nav (hamburger) ---------- */
.nav-open { display: none; }
.nav-toggle { display: none; }
.nav-mobile-only { display: none; }

@media (max-width: 1024px) {
  .nav-mobile-only { display: block; }
  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    flex: 0 0 auto;
    cursor: pointer;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius);
    background: var(--white);
  }
  .nav-toggle:hover { border-color: var(--red); }
  .nav-toggle-bar { position: relative; }
  .nav-toggle-bar,
  .nav-toggle-bar::before,
  .nav-toggle-bar::after {
    content: "";
    display: block;
    width: 20px;
    height: 2px;
    background: var(--ink-strong);
    border-radius: 2px;
    transition: transform 0.2s ease, background 0.2s ease;
  }
  .nav-toggle-bar::before { position: absolute; left: 0; top: -6px; }
  .nav-toggle-bar::after { position: absolute; left: 0; top: 6px; }
  .nav-open:checked ~ .nav-toggle .nav-toggle-bar { background: transparent; }
  .nav-open:checked ~ .nav-toggle .nav-toggle-bar::before { transform: translateY(6px) rotate(45deg); }
  .nav-open:checked ~ .nav-toggle .nav-toggle-bar::after { transform: translateY(-6px) rotate(-45deg); }

  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--white);
    border-top: 1px solid var(--line);
    border-bottom: 3px solid var(--red);
    box-shadow: var(--shadow);
    padding: 6px 20px 18px;
    max-height: calc(100vh - 110px);
    overflow-y: auto;
  }
  .nav-open:checked ~ .nav { display: flex; }
  .nav > a, .nav-dropdown summary {
    padding: 13px 4px;
    border-bottom: 1px solid var(--line);
    border-radius: 0;
    font-size: 1rem;
  }
  .nav > a:hover, .nav-dropdown summary:hover { background: transparent; }
  .nav-dropdown-panel {
    position: static;
    min-width: 0;
    border: 0;
    box-shadow: none;
    padding: 4px 0 10px;
  }
  .nav > a.nav-cta {
    margin: 16px 0 0;
    border-bottom: 0;
    text-align: center;
  }
}

/* ---------- Thư viện tài liệu (/tai-lieu/) ---------- */
.doc-toolbar { margin: 8px 0 26px; display: flex; flex-direction: column; gap: 12px; }
.doc-toolbar input[type="search"] {
  width: 100%; max-width: 560px; padding: 12px 16px; font: inherit; color: var(--ink-strong);
  border: 1px solid var(--line-strong); border-radius: var(--radius); background: var(--white);
}
.doc-toolbar input[type="search"]:focus { outline: 2px solid var(--red); outline-offset: 1px; border-color: var(--red); }
.doc-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.doc-chip {
  font: inherit; font-size: 0.86rem; font-weight: 500; cursor: pointer; color: var(--ink);
  background: var(--white); border: 1px solid var(--line-strong); border-radius: 999px; padding: 6px 14px;
}
.doc-chip:hover { border-color: var(--red); color: var(--red); }
.doc-chip.on { background: var(--ink-strong); border-color: var(--ink-strong); color: #fff; }
.doc-list { display: flex; flex-direction: column; gap: 12px; }
.doc-item {
  display: flex; align-items: center; justify-content: space-between; gap: 18px;
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 20px;
}
.doc-item:hover { box-shadow: var(--shadow-tight); border-color: var(--line-strong); }
.doc-item h3 { font-size: 1.02rem; margin: 0 0 4px; color: var(--ink-strong); }
.doc-item .meta-line { margin: 0 0 4px; }
.doc-products { margin: 0; font-size: 0.86rem; color: var(--muted); }
.doc-products a { color: var(--ink); text-decoration: none; }
.doc-products a:hover { color: var(--red); text-decoration: underline; }
.doc-actions { flex-shrink: 0; }
.doc-actions .button { white-space: nowrap; }
.doc-badge {
  display: inline-block; margin-left: 8px; padding: 2px 8px; font-size: 0.72rem; font-weight: 600;
  color: var(--ink); background: var(--soft-blue); border-radius: 999px; vertical-align: middle;
}
#docEmpty { color: var(--muted); padding: 24px 0; }
@media (max-width: 640px) {
  .doc-item { flex-direction: column; align-items: flex-start; }
  .doc-actions { width: 100%; }
  .doc-actions .button { width: 100%; text-align: center; }
}

/* ---------- Trang ứng dụng (/ung-dung/) ---------- */
.container.narrow { max-width: 820px; }
.container.narrow h2 { margin-top: 0; }
.app-grid { margin-top: 8px; }
.app-card { overflow: hidden; display: flex; flex-direction: column; }
.app-media { display: block; aspect-ratio: 16 / 10; overflow: hidden; background: var(--soft); }
.app-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .3s ease; }
.app-card:hover .app-media img { transform: scale(1.04); }
.app-body { padding: 16px 18px 20px; }
.app-body h3 { font-size: 1.08rem; margin: 6px 0 6px; }
.app-body h3 a { color: var(--ink-strong); text-decoration: none; }
.app-body h3 a:hover { color: var(--red); }
.app-body p { margin: 0; color: var(--muted); font-size: 0.88rem; }
.check-list-lg li { font-size: 1rem; margin-bottom: 12px; }
.faq-list { display: flex; flex-direction: column; gap: 10px; }
.faq-item { border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); padding: 0 18px; }
.faq-item summary {
  cursor: pointer; font-weight: 600; color: var(--ink-strong); padding: 16px 0; list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 1.4rem; color: var(--red); font-weight: 400; line-height: 1; }
.faq-item[open] summary::after { content: "\2013"; }
.faq-answer { padding: 0 0 16px; }
.faq-answer p { margin: 0; color: var(--ink); }
.section-cta { background: var(--ink-strong); }
.section-cta h2, .section-cta p { color: #fff; }
.section-cta p { opacity: .85; }

/* ---------- Blog (/blog/) ---------- */
.blog-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.blog-chip { font-size: 0.82rem; font-weight: 500; color: var(--ink); background: var(--soft-blue); border-radius: 999px; padding: 5px 13px; }
.blog-grid { margin-top: 8px; }
.blog-card { overflow: hidden; display: flex; flex-direction: column; }
.blog-media { display: block; aspect-ratio: 16 / 9; overflow: hidden; background: var(--soft); }
.blog-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .3s ease; }
.blog-card:hover .blog-media img { transform: scale(1.04); }
.blog-body { padding: 16px 18px 20px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.blog-meta { display: flex; gap: 10px; align-items: center; font-size: 0.78rem; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.blog-cat { color: var(--red); font-weight: 600; }
.blog-body h3 { font-size: 1.1rem; margin: 0; line-height: 1.35; }
.blog-body h3 a { color: var(--ink-strong); text-decoration: none; }
.blog-body h3 a:hover { color: var(--red); }
.blog-body p { margin: 0; color: var(--muted); font-size: 0.9rem; flex: 1; }
.blog-more { font-size: 0.85rem; font-weight: 600; color: var(--red); }
.blog-hero { width: 100%; border-radius: 6px; margin-top: 20px; border: 1px solid var(--line); }
article .container.narrow h2 { margin-top: 0; }
article .container.narrow p { color: var(--ink); }

/* ---------- Công cụ (/cong-cu/) ---------- */
.tool-grid { margin-top: 8px; }
.tool-card { padding: 26px 24px; display: flex; flex-direction: column; align-items: flex-start; gap: 12px; }
.tool-icon { width: 48px; height: 48px; display: flex; align-items: center; justify-content: center; font-size: 1.6rem; color: #fff; background: var(--ink-strong); border-radius: 10px; }
.tool-card h3 { margin: 0; font-size: 1.15rem; }
.tool-card h3 a { color: var(--ink-strong); text-decoration: none; }
.tool-card h3 a:hover { color: var(--red); }
.tool-card p { margin: 0; color: var(--muted); flex: 1; }
/* Calculator */
.calc-wrap { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 24px; align-items: start; }
.calc-form { display: flex; flex-direction: column; gap: 18px; background: var(--white); border: 1px solid var(--line); border-radius: 8px; padding: 22px; }
.calc-field { display: flex; flex-direction: column; gap: 6px; }
.calc-field label { font-weight: 600; color: var(--ink-strong); font-size: 0.92rem; }
.calc-field input, .calc-field select { font: inherit; padding: 10px 12px; border: 1px solid var(--line-strong); border-radius: 5px; color: var(--ink-strong); background: var(--white); width: 100%; }
.calc-field input:focus, .calc-field select:focus { outline: 2px solid var(--red); outline-offset: 1px; border-color: var(--red); }
.calc-field small { color: var(--muted); font-size: 0.78rem; }
.calc-inline { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.calc-inline select { flex: 1; min-width: 180px; }
.calc-inline input { width: 110px; }
.calc-unit { color: var(--muted); font-size: 0.85rem; }
.calc-adv summary { cursor: pointer; font-weight: 600; color: var(--red); font-size: 0.88rem; }
.calc-adv .calc-field { margin-top: 12px; }
.calc-result { background: var(--ink-strong); color: #fff; border-radius: 8px; padding: 24px; position: sticky; top: 90px; }
.calc-big { text-align: center; padding-bottom: 16px; border-bottom: 1px solid rgba(255,255,255,.18); }
.calc-big span { display: block; font-size: 0.82rem; opacity: .8; text-transform: uppercase; letter-spacing: .04em; }
.calc-big strong { display: block; font-size: 2rem; color: #fff; font-family: 'Bai Jamjuree', sans-serif; margin: 4px 0; }
.calc-big em { font-size: 0.8rem; opacity: .7; font-style: normal; }
.calc-lines { list-style: none; margin: 16px 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.calc-lines li { display: flex; justify-content: space-between; font-size: 0.9rem; opacity: .9; border-bottom: 1px dotted rgba(255,255,255,.15); padding-bottom: 6px; }
.calc-lines li span { font-weight: 600; }
.calc-save { background: rgba(231,52,57,.16); border: 1px solid rgba(231,52,57,.5); border-radius: 6px; padding: 12px 14px; margin-bottom: 16px; }
.calc-save span { display: block; font-size: 0.78rem; opacity: .85; }
.calc-save strong { display: block; font-size: 1.3rem; color: #fff; margin-top: 4px; }
.calc-result .button { width: 100%; text-align: center; }
.calc-note { font-size: 0.74rem; opacity: .6; margin: 12px 0 0; }
/* Selector */
.sel-options { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 8px; }
.sel-opt { font: inherit; font-weight: 500; text-align: left; cursor: pointer; color: var(--ink-strong); background: var(--white); border: 1px solid var(--line-strong); border-radius: 8px; padding: 14px 18px; flex: 1 1 260px; }
.sel-opt:hover { border-color: var(--red); color: var(--red); }
.sel-opt.on { background: var(--ink-strong); border-color: var(--ink-strong); color: #fff; }
.sel-cta { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 24px; }
@media (max-width: 820px) { .calc-wrap { grid-template-columns: 1fr; } .calc-result { position: static; } }

/* ---------- Hero banner cho trang hub/BU ---------- */
.page-hero { background-size: cover; background-position: center; color: #fff; padding: 64px 0; }
.page-hero-inner { max-width: 760px; }
.page-hero-crumb { margin-bottom: 14px; }
.page-hero-crumb .breadcrumb, .page-hero-crumb .breadcrumb a { color: rgba(255,255,255,.8); }
.page-hero-crumb .breadcrumb a:hover { color: #fff; }
.page-hero .kicker-light { color: #fff; opacity: .95; }
.page-hero h1 { color: #fff; margin: 8px 0 12px; }
.page-hero .lead { color: rgba(255,255,255,.92); margin: 0; }
@media (max-width: 640px) { .page-hero { padding: 44px 0; } }

/* ---------- Thẻ tải tài liệu (trang sản phẩm) ---------- */
.dl-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin-top: 6px; }
.dl-card {
  display: flex; align-items: center; gap: 16px; text-decoration: none;
  background: var(--white); border: 1px solid var(--line); border-radius: 8px;
  padding: 16px 18px; box-shadow: var(--shadow-tight); transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.dl-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: var(--line-strong); }
.dl-icon {
  flex-shrink: 0; width: 46px; height: 46px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: var(--red); background: rgba(231,52,57,.09); border: 1px solid rgba(231,52,57,.18);
}
.dl-body { display: flex; flex-direction: column; gap: 3px; min-width: 0; flex: 1; }
.dl-title { font-family: var(--font-head); font-weight: 600; color: var(--ink-strong); font-size: 0.98rem; line-height: 1.3; }
.dl-meta { font-size: 0.78rem; color: var(--muted); text-transform: uppercase; letter-spacing: .03em; }
.dl-arrow {
  flex-shrink: 0; width: 38px; height: 38px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--ink); background: var(--soft); transition: background .18s ease, color .18s ease;
}
.dl-card:hover .dl-arrow { background: var(--red); color: #fff; }
@media (max-width: 640px) { .dl-grid { grid-template-columns: 1fr; } }