/* ============================================================
   QS Tech — Components (header, footer, nav, hero, floating widgets, etc.)
   ============================================================ */

/* ============ TOP UTILITY BAR ============ */
.topbar {
  background: var(--c-brand-deep);
  color: oklch(94% 0 0);
  padding: 0.5rem 0;
  font-size: 0.82rem;
}
.topbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.topbar a:hover { color: var(--c-accent-soft); }
.topbar-left {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  flex-wrap: wrap;
}
.topbar-left span::before {
  content: "";
  display: inline-block;
  margin-right: 0.4rem;
  vertical-align: middle;
}
.tb-phone::before { content: "📞"; }
.tb-mail::before { content: "✉"; }
.tb-loc::before { content: "📍"; }
.topbar-right { display: flex; gap: 1rem; }
@media (max-width: 700px) {
  .topbar .tb-mail, .topbar .tb-loc { display: none; }
}

/* ============ NAV ============ */
.nav {
  background: var(--c-bg);
  border-bottom: 1px solid var(--c-line);
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  transition: box-shadow var(--d-normal) var(--ease);
}
.nav.is-scrolled { box-shadow: var(--shadow-sm); }
.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.9rem;
  padding-bottom: 0.9rem;
  gap: 2rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--c-brand-deep);
  letter-spacing: -0.01em;
}
.brand-mark {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--c-brand), var(--c-brand-deep));
  color: var(--c-bg);
  display: grid;
  place-items: center;
  font-family: var(--f-display);
  font-size: 1.1rem;
  font-weight: 700;
  border-radius: 8px;
  letter-spacing: -0.02em;
}
.brand-name { line-height: 1.1; }
.brand-name small {
  display: block;
  font-size: 0.65rem;
  font-weight: 400;
  color: var(--c-mute);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-top: 2px;
}
.nav-menu {
  display: flex;
  gap: 1.8rem;
  font-size: 0.92rem;
  font-weight: 500;
}
.nav-menu a, .nav-menu .nav-link {
  color: var(--c-ink-soft);
  position: relative;
  padding: 0.4rem 0;
  transition: color var(--d-fast);
}
.nav-menu a::after, .nav-menu .nav-link::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 100%;
  height: 2px;
  background: var(--c-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--d-normal) var(--ease);
}
.nav-menu a:hover, .nav-menu a.current { color: var(--c-ink); }
.nav-menu a:hover::after, .nav-menu a.current::after { transform: scaleX(1); }

/* Dropdown group (Cẩm nang) */
.nav-group { position: relative; display: flex; align-items: center; }
.nav-caret { font-size: 0.7em; opacity: 0.65; margin-left: 0.15rem; }
.nav-dropdown {
  position: absolute; top: 100%; left: 0;
  min-width: 210px; display: flex; flex-direction: column; padding: 0.4rem;
  background: var(--c-bg); border: 1px solid var(--c-line); border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  opacity: 0; visibility: hidden; transform: translateY(6px);
  transition: opacity var(--d-fast) var(--ease), transform var(--d-fast) var(--ease), visibility var(--d-fast);
  z-index: 60;
}
.nav-group:hover .nav-dropdown, .nav-group:focus-within .nav-dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.nav-dropdown .nav-sublink { padding: 0.55rem 0.7rem; border-radius: 6px; white-space: nowrap; color: var(--c-ink-soft); }
.nav-dropdown .nav-sublink::after { display: none; }
.nav-dropdown .nav-sublink:hover { background: var(--c-paper); color: var(--c-ink); }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  position: relative;
}
.nav-toggle span {
  position: absolute;
  left: 10px; right: 10px;
  height: 2px;
  background: var(--c-ink);
  transition: transform var(--d-normal) var(--ease), opacity var(--d-fast);
}
.nav-toggle span:nth-child(1) { top: 16px; }
.nav-toggle span:nth-child(2) { top: 22px; }
.nav-toggle span:nth-child(3) { top: 28px; }
.nav-toggle.is-open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 980px) {
  .nav-menu {
    position: fixed;
    inset: 64px 0 auto 0;
    flex-direction: column;
    gap: 0;
    background: var(--c-bg);
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--c-line);
    transform: translateY(-110%);
    transition: transform var(--d-normal) var(--ease);
    box-shadow: var(--shadow-md);
  }
  .nav-menu.is-open { transform: translateY(0); }
  .nav-menu a, .nav-menu .nav-link {
    padding: 0.9rem 0;
    border-bottom: 1px solid var(--c-line-soft);
  }
  .nav-menu a:last-child { border-bottom: none; }
  .nav-toggle { display: block; }
  /* CTA "Đăng ký đại lý" đã có ở top-bar tiện ích → ẩn cả cụm nút để không tràn ngang ở ≤360px */
  .nav-actions { display: none; }
  .nav-group { flex-direction: column; align-items: stretch; }
  .nav-dropdown { position: static; opacity: 1; visibility: visible; transform: none; min-width: 0; padding: 0 0 0 1rem; border: none; border-radius: 0; box-shadow: none; background: transparent; }
  .nav-dropdown .nav-sublink { padding: 0.75rem 0; }
  .nav-caret { display: none; }
}

/* ============ PROMO STRIP ============ */
.promo {
  background: linear-gradient(90deg, var(--c-accent) 0%, oklch(65% 0.16 60) 100%);
  color: oklch(15% 0 0);
  padding: 0.7rem 0;
  font-size: 0.88rem;
  font-weight: 600;
  overflow: hidden;
}
.promo-track {
  display: flex;
  gap: 4rem;
  animation: promoSlide 30s linear infinite;
  width: max-content;
  will-change: transform;
}
.promo-track span {
  display: flex;
  align-items: center;
  gap: 4rem;
  white-space: nowrap;
}
.promo-track span::after { content: "✦"; }
.promo:hover .promo-track { animation-play-state: paused; }
@keyframes promoSlide {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* ============ TRUST STRIP ============ */
.trust-strip {
  background: var(--c-bg);
  border-bottom: 1px solid var(--c-line);
  padding: 2rem 0;
}
.trust-strip .container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  text-align: center;
}
@media (min-width: 780px) {
  .trust-strip .container { grid-template-columns: repeat(4, 1fr); }
}
.trust-strip .item .icon {
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
}
.trust-strip .item .title {
  font-weight: 600;
  font-size: 0.92rem;
  margin-bottom: 0.2rem;
}
.trust-strip .item .desc {
  font-size: 0.78rem;
  color: var(--c-mute);
}

/* ============ FOOTER ============ */
.site-footer {
  background: oklch(12% 0.02 264);
  color: oklch(85% 0 0);
  padding-top: 4rem;
  border-top: 5px solid transparent;
  border-image: linear-gradient(90deg, var(--c-yellow), var(--c-accent)) 1;
}
.foot-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid oklch(98% 0 0 / 0.08);
}
@media (min-width: 700px) { .foot-grid { grid-template-columns: 2fr 1fr 1fr 1fr; } }
.foot-brand .logo {
  font-family: var(--f-display);
  font-size: 1.5rem;
  color: var(--c-bg);
  margin-bottom: 1rem;
  font-weight: 700;
}
.foot-brand p {
  font-size: 0.88rem;
  color: oklch(85% 0 0 / 0.7);
  margin: 0 0 1.5rem;
  max-width: 36ch;
  line-height: 1.6;
}
.foot-brand .social {
  display: flex;
  gap: 0.5rem;
}
.foot-brand .social a {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: oklch(98% 0 0 / 0.06);
  display: grid;
  place-items: center;
  font-size: 0.9rem;
  transition: background var(--d-fast);
  font-weight: 700;
}
.foot-brand .social a:hover { background: var(--c-accent); color: oklch(15% 0 0); }
.site-footer h5 {
  color: var(--c-bg);
  font-size: 0.92rem;
  font-weight: 700;
  margin: 0 0 1rem;
}
.site-footer ul li {
  margin-bottom: 0.6rem;
  font-size: 0.88rem;
}
.site-footer a {
  color: oklch(85% 0 0 / 0.7);
  transition: color var(--d-fast);
}
.site-footer a:hover { color: var(--c-accent); }
.foot-bot {
  padding: 1.5rem 0;
  font-size: 0.78rem;
  color: oklch(85% 0 0 / 0.5);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.foot-cert {
  display: flex;
  gap: 0.6rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}
.foot-cert .badge {
  background: oklch(98% 0 0 / 0.05);
  border: 1px solid oklch(98% 0 0 / 0.1);
  padding: 0.4rem 0.7rem;
  border-radius: 4px;
  font-size: 0.7rem;
  color: oklch(85% 0 0 / 0.8);
  font-weight: 600;
  letter-spacing: 0.05em;
}

/* ============ FLOATING WIDGETS (Zalo + Phone) ============ */
.float {
  position: fixed;
  right: 1.2rem;
  bottom: 1.2rem;
  z-index: var(--z-float);
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}
.float-btn {
  position: relative;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  transition: transform var(--d-normal) var(--ease);
}
.float-btn.zalo {
  background: var(--c-zalo);
  color: oklch(98% 0 0);
  box-shadow: 0 8px 24px oklch(60% 0.18 240 / 0.5);
}
.float-btn.phone {
  background: var(--c-success);
  color: oklch(98% 0 0);
  box-shadow: 0 8px 24px oklch(55% 0.14 145 / 0.5);
  font-size: 1.2rem;
}
.float-btn:hover { transform: scale(1.1); }
.float-btn::after {
  content: "";
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 2px solid currentColor;
  opacity: 0;
  animation: pulseRing 2.5s ease-out infinite;
}
.float-btn.phone::after { animation-delay: 1s; }
@keyframes pulseRing {
  0% { transform: scale(0.95); opacity: 0.7; }
  100% { transform: scale(1.6); opacity: 0; }
}

/* ============ ARCHIVE FALLBACK ============ */
.archive-fallback {
  padding: calc(var(--pad-section) + 4rem) var(--pad-x) var(--pad-section);
  max-width: var(--container-max);
  margin-inline: auto;
}
.archive-fallback .page-head { margin-bottom: 3rem; }
.archive-fallback .page-head h1 {
  font-family: var(--f-display);
  font-size: var(--t-display);
  margin: 0.8rem 0 0;
  font-weight: 600;
}
.post-list {
  display: grid;
  gap: 2rem;
}
.post-card {
  padding: 2rem 0;
  border-top: 1px solid var(--c-line);
}
.post-card-title {
  font-family: var(--f-display);
  font-size: 1.8rem;
  margin: 0 0 0.8rem;
  font-weight: 600;
}


/* ============================================================
 * Media component — ô ảnh/video + placeholder brand
 * (dùng qua qstech_media_placeholder(); thay ảnh thật qua filter qstech_media_src)
 * ============================================================ */
.media-slot { position: relative; width: 100%; border-radius: var(--radius-lg); overflow: hidden; background: var(--c-paper); }
.media-slot > img,
.media-slot > video,
.media-slot > iframe { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; border: 0; display: block; }

.media-ph {
	position: relative;
	display: flex; flex-direction: column; align-items: center; justify-content: center;
	gap: 0.55rem; text-align: center;
	width: 100%; border-radius: var(--radius-lg); overflow: hidden;
	padding: 1.5rem;
	color: oklch(96% 0.01 80);
	background:
		radial-gradient(circle at 1px 1px, oklch(100% 0 0 / 0.07) 1px, transparent 0) 0 0 / 16px 16px,
		linear-gradient(145deg, var(--c-brand) 0%, var(--c-brand-deep) 60%, oklch(22% 0.09 45) 130%);
	border: 1px solid oklch(100% 0 0 / 0.06);
	isolation: isolate;
}
.media-ph::after { /* glow accent góc */
	content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
	background: radial-gradient(60% 55% at 85% 12%, oklch(58% 0.16 55 / 0.28), transparent 70%);
}
.media-ph--light {
	color: var(--c-ink-soft);
	background:
		radial-gradient(circle at 1px 1px, oklch(0% 0 0 / 0.04) 1px, transparent 0) 0 0 / 16px 16px,
		linear-gradient(145deg, var(--c-paper) 0%, oklch(90% 0.02 70) 120%);
	border-color: var(--c-line);
}
.media-ph--light::after { background: radial-gradient(60% 55% at 85% 12%, oklch(58% 0.16 55 / 0.14), transparent 70%); }

.media-ph-icon { display: grid; place-items: center; width: 54px; height: 54px; border-radius: 50%; background: oklch(100% 0 0 / 0.08); }
.media-ph--light .media-ph-icon { background: oklch(0% 0 0 / 0.04); }
.media-ph-icon svg { width: 26px; height: 26px; color: var(--c-accent-soft); }
.media-ph--light .media-ph-icon svg { color: var(--c-accent-deep); }
.media-ph-label { font-family: var(--f-display); font-size: 1.05rem; font-weight: 600; letter-spacing: 0.01em; }
.media-ph-hint { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.14em; opacity: 0.6; }

/* Tỷ lệ khung — dùng aspect-ratio, fallback padding-top cho browser cũ */
.media-ph--16x9, .media-slot--16x9 { aspect-ratio: 16 / 9; }
.media-ph--4x3,  .media-slot--4x3  { aspect-ratio: 4 / 3; }
.media-ph--3x2,  .media-slot--3x2  { aspect-ratio: 3 / 2; }
.media-ph--1x1,  .media-slot--1x1  { aspect-ratio: 1 / 1; }
.media-ph--21x9, .media-slot--21x9 { aspect-ratio: 21 / 9; }

/* Video placeholder: icon play to hơn + con trỏ gợi mở */
.media-ph[data-media-key][aria-label*="Video"] .media-ph-icon,
.media-ph[aria-label*="video"] .media-ph-icon { width: 66px; height: 66px; }

/* Băng 3 ảnh dùng chung */
.media-band { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
@media (max-width: 720px) { .media-band { grid-template-columns: 1fr; } }

/* ============ LOGO ẢNH (thay brand-mark chữ) ============ */
.brand-logo {
  height: clamp(38px, 3rem + 1vw, 52px);
  width: auto;
  display: block;
  border-radius: 6px;
}
.brand-name--sr {
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0; padding: 0; margin: -1px;
}
.foot-logo {
  height: 54px;
  width: auto;
  display: block;
  border-radius: 8px;
  margin-bottom: 0.2rem;
}