/* Header dùng chung cho trang chủ (home-layout + home-d.css): đúng header của các trang con (partials/header.hbs),
   tách từ screen.css và khoá trong .site-header để không đụng style trang chủ. Sửa header thì sửa cả screen.css. */
.site-header {
  --bg: #0f2b22; --surface-2: #1a3f32; --line: #27503f; --line-strong: #376452;
  --text: #f1ebdc; --text-2: #bdc9bf; --text-3: #9fb1a5; --brand: #e3b76b; --brand-ink: #0f2b22;
  --gold: oklch(83% 0.105 82); --gold-deep: oklch(68% 0.11 75); --gold-ink: oklch(22% 0.05 75);
  --font: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --r-control: 8px; --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --gutter: 20px; --w-page: 1180px; --header-h: 64px;
  position: sticky; top: 0; z-index: 20;
  font-family: var(--font); font-size: 16px; line-height: 1.65; color: var(--text);
  background: oklch(24.1% 0.035 170 / 0.72);
  -webkit-backdrop-filter: blur(14px) saturate(140%); backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid transparent;
  transition: border-color 200ms ease;
}
@media (max-width: 480px) { .site-header { --gutter: 16px; } }
.site-header.is-scrolled { border-bottom-color: var(--line); }
.site-header a { color: inherit; text-decoration: none; }
.site-header svg { display: block; max-width: 100%; height: auto; }
.site-header ul[role="list"] { list-style: none; margin: 0; padding: 0; }
.site-header :focus-visible { outline: 2px solid var(--brand); outline-offset: 3px; border-radius: 4px; }

.site-header .btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 44px; padding: 0 18px;
  border: 1px solid transparent; border-radius: var(--r-control);
  font: 600 0.9375rem/1 var(--font); white-space: nowrap; cursor: pointer;
  transition: transform 160ms var(--ease-out), background-color 160ms ease, border-color 160ms ease;
}
.site-header .btn:hover { transform: none; }
.site-header .btn:active { transform: scale(0.97); }
.site-header .btn-primary { background: var(--brand); color: var(--brand-ink); }
@media (hover: hover) and (pointer: fine) { .site-header .btn-primary:hover { background: color-mix(in srgb, var(--brand) 88%, var(--text)); } }
.site-header .icon-btn {
  display: inline-grid; place-items: center; width: 40px; height: 40px;
  border: 0; border-radius: var(--r-control); background: transparent; color: var(--text-2); cursor: pointer;
  transition: transform 160ms var(--ease-out), background-color 160ms ease;
}
.site-header .icon-btn:active { transform: scale(0.95); }
@media (hover: hover) and (pointer: fine) { .site-header .icon-btn:hover { background: var(--surface-2); color: var(--text); } }

.site-header .header-inner {
  display: flex; align-items: center; gap: 24px;
  height: var(--header-h);
  max-width: calc(var(--w-page) + var(--gutter) * 2); margin-inline: auto; padding-inline: var(--gutter);
}
.site-header .logo { display: inline-flex; align-items: center; gap: 9px; flex: none; color: var(--text); }
.site-header .logo-avatar { width: 44px; height: 44px; flex: none; display: block; transition: transform .2s; }
.site-header .logo:hover .logo-avatar { transform: rotate(-4deg) scale(1.04); }
.site-header .header-nav { flex: 1; }
.site-header .nav-list { display: flex; align-items: center; gap: 4px; }
.site-header .nav-link {
  display: inline-block; padding: 8px 11px; border-radius: var(--r-control);
  color: var(--text-2); font-size: 0.9375rem; font-weight: 500; white-space: nowrap;
  transition: color 160ms ease, background-color 160ms ease;
}
.site-header .nav-link.is-current { color: var(--text); }
@media (hover: hover) and (pointer: fine) { .site-header .nav-link:hover { color: var(--text); background: var(--surface-2); } }
.site-header .nav-vip .nav-link { display: inline-flex; align-items: center; gap: 7px; padding: 6px 8px 6px 12px; border-radius: 999px; color: var(--gold); border: 1px solid oklch(83% 0.105 82 / 0.5); background: linear-gradient(135deg, oklch(83% 0.105 82 / 0.18), oklch(83% 0.105 82 / 0.04)); font-weight: 700; transition: background 180ms ease, border-color 180ms ease; }
.site-header .nav-badge { font-family: var(--mono); font-size: 0.6875rem; font-weight: 700; line-height: 1; padding: 4px 6px; border-radius: 999px; background: linear-gradient(180deg, oklch(88% 0.1 85), var(--gold-deep)); color: var(--gold-ink); }
@media (hover: hover) and (pointer: fine) { .site-header .nav-vip .nav-link:hover { color: var(--gold); border-color: var(--gold); background: color-mix(in srgb, var(--gold) 22%, transparent); } }
.site-header .nav-ea .nav-link { display: inline-flex; align-items: center; gap: 7px; }
.site-header .nav-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--brand); box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 25%, transparent); animation: navpulse 2.4s ease-in-out infinite; }
@keyframes navpulse { 50% { box-shadow: 0 0 0 6px color-mix(in srgb, var(--brand) 0%, transparent); } }
@media (prefers-reduced-motion: reduce) { .site-header .nav-dot { animation: none; } }
.site-header .nav-cta-mobile { display: none; }
.site-header .header-actions { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.site-header .header-cta { height: 40px; padding: 0 16px; }
.site-header .menu-btn { display: none; }

@media (max-width: 1119px) {
  .site-header .menu-btn { display: inline-grid; }
  .site-header .header-cta { display: none; }
  .site-header .header-nav {
    position: fixed; inset: var(--header-h) 0 0 0; z-index: 19;
    height: calc(100dvh - var(--header-h)); overflow-y: auto;
    padding: 16px var(--gutter) calc(24px + env(safe-area-inset-bottom));
    display: flex; flex-direction: column;
    background: var(--bg); border-bottom: 1px solid var(--line);
    opacity: 0; transform: translateY(-6px); visibility: hidden;
    transition: opacity 180ms var(--ease-out), transform 180ms var(--ease-out), visibility 0s linear 180ms;
  }
  .site-header .header-nav.is-open { opacity: 1; transform: none; visibility: visible; transition-delay: 0s; }
  .site-header .nav-list { flex: 1; flex-direction: column; align-items: stretch; gap: 0; }
  .site-header .nav-link { display: block; padding: 14px 0; border-radius: 0; border-bottom: 1px solid var(--line); color: var(--text);
    font-size: 1.375rem; font-weight: 600; letter-spacing: -0.015em; }
  .site-header .nav-list li { opacity: 0; transform: translateY(10px); transition: opacity 260ms ease, transform 320ms var(--ease-out); }
  .site-header .header-nav.is-open .nav-list li { opacity: 1; transform: none; }
  .site-header .header-nav.is-open .nav-list li:nth-child(2) { transition-delay: 30ms; }
  .site-header .header-nav.is-open .nav-list li:nth-child(3) { transition-delay: 60ms; }
  .site-header .header-nav.is-open .nav-list li:nth-child(4) { transition-delay: 90ms; }
  .site-header .header-nav.is-open .nav-list li:nth-child(5) { transition-delay: 120ms; }
  .site-header .header-nav.is-open .nav-list li:nth-child(6) { transition-delay: 150ms; }
  .site-header .nav-cta-mobile { display: flex; width: 100%; margin-top: 20px; height: 60px; font-size: 1.0625rem; }
  .site-header .menu-btn[aria-expanded="true"] .menu-line-a { transform: translateY(4px) rotate(45deg); }
  .site-header .menu-btn[aria-expanded="true"] .menu-line-b { transform: translateY(-4px) rotate(-45deg); }
  .site-header .menu-line-a, .site-header .menu-line-b { transform-origin: 12px 12px; transition: transform 180ms var(--ease-out); }
}
@media (max-width: 899px) { .site-header .nav-vip .nav-link { padding: 10px 16px; margin: 6px 0; } }
body.menu-open { overflow: hidden; }