/* Two-row header: brand + actions, then right-aligned nav */

:root {
  --header-h: 7rem;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  border-bottom: 1px solid transparent;
  background: linear-gradient(180deg, rgba(10, 6, 8, 0.72), rgba(10, 6, 8, 0.18) 85%, transparent);
  transition:
    background 0.35s var(--ease),
    border-color 0.35s,
    box-shadow 0.35s;
}

.site-header.is-scrolled {
  background: rgba(10, 6, 8, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: rgba(232, 197, 106, 0.18);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.28);
}

.header-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "brand actions"
    "nav nav";
  align-items: center;
  gap: 0.15rem 1.35rem;
  min-height: var(--header-h);
  padding-block: 0.5rem 0.28rem;
}

.brand {
  grid-area: brand;
  display: flex;
  align-items: center;
  gap: 0.7rem;
  min-width: 0;
  z-index: 2;
}

.brand img {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  object-fit: cover;
  background: #fff;
  box-shadow: 0 0 0 1px rgba(232, 197, 106, 0.3);
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
  min-width: 0;
}

.brand-text strong {
  font-family: var(--font-display);
  font-size: 1.22rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gold);
  white-space: nowrap;
}

.brand-text span {
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cream-faint);
  white-space: nowrap;
}

.nav-bar {
  grid-area: nav;
  display: flex;
  justify-content: flex-end;
  min-width: 0;
  overflow: visible;
  border-top: 1px solid rgba(232, 197, 106, 0.12);
  padding-top: 0.12rem;
}

.nav-links {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: flex-end;
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 100%;
}

.nav-links li {
  flex-shrink: 0;
}

.nav-links a {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.58rem;
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.055em;
  text-transform: uppercase;
  color: var(--cream-muted);
  white-space: nowrap;
  transition: color 0.22s ease;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0.55rem;
  right: 0.55rem;
  bottom: 0.22rem;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.28s var(--ease);
}

.nav-links a:hover {
  color: var(--cream);
}

.nav-links a:hover::after {
  transform: scaleX(0.55);
}

.nav-links a.is-active,
.nav-links li.active > a {
  color: var(--gold);
}

.nav-links a.is-active::after,
.nav-links li.active > a::after {
  transform: scaleX(1);
}

.header-actions {
  grid-area: actions;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  justify-content: flex-end;
  z-index: 2;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.28rem;
  padding: 0.18rem;
  border: 1px solid rgba(232, 197, 106, 0.22);
  background: rgba(10, 6, 8, 0.35);
}

.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.32rem;
  padding: 0.28rem 0.42rem;
  line-height: 1;
  color: var(--cream-faint);
  opacity: 0.72;
  transition: opacity 0.2s, background 0.2s, color 0.2s;
}

.lang-btn:hover {
  opacity: 1;
  color: var(--cream);
}

.lang-btn.is-active {
  opacity: 1;
  color: var(--gold);
  background: rgba(232, 197, 106, 0.12);
}

.lang-code {
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.14em;
}

.lang-flag {
  width: 18px;
  height: 12px;
  display: block;
  flex-shrink: 0;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.18);
  background-size: cover;
  background-position: center;
}

.lang-flag--vi {
  background:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 20'%3E%3Crect fill='%23da251d' width='30' height='20'/%3E%3Cpolygon fill='%23ff0' points='15,3.2 16.76,8.62 22.5,8.62 17.87,11.96 19.63,17.38 15,14.04 10.37,17.38 12.13,11.96 7.5,8.62 13.24,8.62'/%3E%3C/svg%3E")
    center / cover no-repeat;
}

.lang-flag--en {
  background:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 60 30'%3E%3CclipPath id='a'%3E%3Cpath d='M0 0h60v30H0z'/%3E%3C/clipPath%3E%3Cg clip-path='url(%23a)'%3E%3Cpath d='M0 0h60v30H0z' fill='%23012169'/%3E%3Cpath d='M0 0l60 30m0-30L0 30' stroke='%23fff' stroke-width='6'/%3E%3Cpath d='M0 0l60 30m0-30L0 30' stroke='%23C8102E' stroke-width='4' clip-path='url(%23a)'/%3E%3Cpath d='M30 0v30M0 15h60' stroke='%23fff' stroke-width='10'/%3E%3Cpath d='M30 0v30M0 15h60' stroke='%23C8102E' stroke-width='6'/%3E%3C/g%3E%3C/svg%3E")
    center / cover no-repeat;
}

.hotline {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.05rem;
  line-height: 1.15;
  padding-right: 0.15rem;
}

.hotline-label {
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cream-faint);
}

.hotline-number {
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--cream);
  font-variant-numeric: tabular-nums;
}

.hotline:hover .hotline-number {
  color: var(--gold);
}

.btn-header {
  padding: 0.68rem 1.15rem;
  font-size: 0.74rem;
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(232, 197, 106, 0.28);
  border-radius: 50%;
  place-items: center;
  background: rgba(255, 255, 255, 0.03);
  transition: border-color 0.2s, background 0.2s;
}

.nav-toggle:hover {
  border-color: var(--gold);
}

.nav-toggle-bars {
  position: relative;
  width: 16px;
  height: 12px;
}

.nav-toggle-bars span {
  position: absolute;
  left: 0;
  width: 16px;
  height: 1.5px;
  background: var(--cream);
  transition: transform 0.28s var(--ease), opacity 0.2s, top 0.28s;
}

.nav-toggle-bars span:nth-child(1) { top: 0; }
.nav-toggle-bars span:nth-child(2) { top: 5px; }
.nav-toggle-bars span:nth-child(3) { top: 10px; }

.site-header.is-nav-open .nav-toggle-bars span:nth-child(1) {
  top: 5px;
  transform: rotate(45deg);
}

.site-header.is-nav-open .nav-toggle-bars span:nth-child(2) {
  opacity: 0;
}

.site-header.is-nav-open .nav-toggle-bars span:nth-child(3) {
  top: 5px;
  transform: rotate(-45deg);
}

.nav-backdrop {
  position: fixed;
  inset: 0;
  z-index: 90;
  background: rgba(4, 2, 3, 0.55);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.site-header.is-nav-open .nav-backdrop {
  opacity: 1;
  pointer-events: auto;
}

@media (max-width: 1100px) {
  .nav-links a {
    padding-inline: 0.45rem;
    font-size: 0.72rem;
    letter-spacing: 0.04em;
  }
}

@media (max-width: 980px) {
  :root {
    --header-h: 4.75rem;
  }

  .hotline {
    display: none;
  }

  .header-inner {
    grid-template-columns: 1fr auto;
    grid-template-areas: "brand actions";
    padding-block: 0.55rem;
  }

  .nav-bar {
    grid-area: brand;
    position: static;
    justify-content: unset;
    width: 0;
    height: 0;
    overflow: visible;
    border-top: 0;
    padding-top: 0;
  }

  .nav-toggle {
    display: grid;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 95;
    width: min(320px, 86vw);
    flex-direction: column;
    flex-wrap: nowrap;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: calc(var(--header-h) + 1rem) 1.25rem 1.5rem;
    background:
      linear-gradient(180deg, rgba(22, 16, 18, 0.98), rgba(10, 6, 8, 0.98));
    border-left: 1px solid rgba(232, 197, 106, 0.18);
    box-shadow: -20px 0 50px rgba(0, 0, 0, 0.45);
    transform: translateX(104%);
    visibility: hidden;
    pointer-events: none;
    transition: transform 0.35s var(--ease), visibility 0s linear 0.35s;
    overflow-y: auto;
  }

  .nav-links.is-open {
    transform: translateX(0);
    visibility: visible;
    pointer-events: auto;
    transition: transform 0.35s var(--ease), visibility 0s;
  }

  .nav-links a {
    padding: 0.95rem 0.35rem;
    font-size: 0.92rem;
    letter-spacing: 0.08em;
    border-bottom: 1px solid rgba(247, 239, 228, 0.06);
  }

  .nav-links a::after {
    left: 0;
    right: auto;
    width: 1.25rem;
    bottom: 0.9rem;
    transform-origin: left;
  }

  .nav-links a:hover::after,
  .nav-links a.is-active::after {
    transform: scaleX(1);
  }

  .btn-header {
    padding: 0.62rem 0.9rem;
    font-size: 0.7rem;
  }

  .lang-switch {
    gap: 0.12rem;
    padding: 0.12rem;
  }

  .lang-btn {
    padding: 0.22rem 0.32rem;
  }
}

@media (max-width: 520px) {
  .lang-code {
    display: none;
  }

  .brand-text span {
    display: none;
  }

  .brand-text strong {
    font-size: 1rem;
    letter-spacing: 0.06em;
  }

  .header-inner {
    gap: 0.65rem;
  }
}