/**
 * PCTechComVn — Header & Navigation CSS
 * Child Theme CSS Module
 * Version: 1.0.0 (Sprint 1)
 *
 * Components:
 * 1. Header (.header) — fixed top, glassmorphism, sticky on scroll
 * 2. Nav Links (.nav-links) — desktop horizontal menu + underline hover
 * 3. Header Actions (.header-actions) — diagnose btn + theme toggle
 * 4. Nav CTA (.nav-cta) — "Gọi Ngay" primary button
 * 5. Nav Toggle (.nav-toggle) — hamburger → X animation
 * 6. Nav Overlay (.nav-overlay) — dark backdrop on mobile
 * 7. Nav Drawer (.nav-drawer) — slide-in right drawer
 * 8. Diagnose Button (.btn-diagnose) — header quick action
 *
 * JS: sticky-header.js, nav-drawer.js, theme-toggle.js (Sprint 0)
 * Bricks: Template Part → Header (apply .header class)
 */

/* ═══════════════════════════════════════════════
   1. HEADER — Fixed top bar
   ═══════════════════════════════════════════════ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  background: rgba(6, 42, 85, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  z-index: var(--z-header, 1000);
  transition: box-shadow 0.3s ease, background 0.3s ease;
}

/* Scrolled state — toggled by sticky-header.js */
.header.scrolled {
  background: rgba(4, 26, 53, 0.98);
  box-shadow: 0 4px 32px rgba(0, 0, 0, 0.3);
}

/* Header inner layout */
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}


/* ═══════════════════════════════════════════════
   2. LOGO
   ═══════════════════════════════════════════════ */
.logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.logo img {
  height: 48px;
  width: auto;
  transition: transform var(--transition-fast);
}

.logo:hover img {
  transform: scale(1.04);
}


/* ═══════════════════════════════════════════════
   3. NAV — Desktop horizontal menu
   ═══════════════════════════════════════════════ */
.nav {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links a {
  font-weight: 500;
  font-size: 0.92rem;
  color: rgba(255, 255, 255, 0.85);
  transition: color 0.2s;
  position: relative;
  padding: 4px 0;
  text-decoration: none;
}

/* Orange underline on hover */
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--orange);
  transition: width 0.3s ease;
}

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

.nav-links a:hover::after {
  width: 100%;
}

/* Active state (set by JS or Bricks condition) */
.nav-links a.active {
  color: var(--orange);
}

.nav-links a.active::after {
  width: 100%;
}


/* ═══════════════════════════════════════════════
   4. HEADER ACTIONS — Diagnose + Theme toggle
   ═══════════════════════════════════════════════ */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-diagnose {
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 8px 16px;
  border-radius: 50px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast),
              border-color var(--transition-fast);
}

.btn-diagnose:hover {
  background: rgba(255, 255, 255, 0.18);
  border-color: var(--orange);
}


/* ═══════════════════════════════════════════════
   5. NAV CTA — Primary call button
   ═══════════════════════════════════════════════ */
.nav-cta .btn {
  padding: 10px 22px;
  font-size: 0.88rem;
}


/* ═══════════════════════════════════════════════
   6. NAV TOGGLE — Hamburger button (mobile)
   ═══════════════════════════════════════════════ */
.nav-toggle {
  display: none; /* hidden on desktop */
  width: 44px;
  height: 44px;
  border: none;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 0;
  flex-shrink: 0;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

/* X animation when open */
.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}


/* ═══════════════════════════════════════════════
   7. NAV OVERLAY — Dark backdrop
   ═══════════════════════════════════════════════ */
.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(4, 26, 53, 0.6);
  z-index: 998;
  opacity: 0;
  transition: opacity 0.3s;
}

.nav-overlay.open {
  display: block;
  opacity: 1;
}


/* ═══════════════════════════════════════════════
   8. NAV DRAWER — Mobile slide-in menu
   ═══════════════════════════════════════════════ */
.nav-drawer {
  display: none; /* hidden on desktop */
  position: fixed;
  top: 0;
  right: 0;
  width: min(300px, 85vw);
  height: 100%;
  height: 100dvh;
  background: var(--blue-deeper);
  z-index: 999;
  padding: calc(var(--header-h) + 16px) 24px 32px;
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  overflow-y: auto;
  box-shadow: -8px 0 40px rgba(0, 0, 0, 0.3);
}

.nav-drawer.open {
  transform: translateX(0);
}

.nav-drawer .drawer-link {
  display: block;
  padding: 14px 0;
  font-size: 1rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  text-decoration: none;
  transition: color 0.2s, padding-left 0.2s;
}

.nav-drawer .drawer-link:hover {
  color: var(--orange);
  padding-left: 8px;
}

.nav-drawer .drawer-cta {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.nav-drawer .drawer-cta .btn {
  width: 100%;
  justify-content: center;
}


/* ═══════════════════════════════════════════════
   9. SCROLL PROGRESS — Below header
   (CSS in utilities.css, referenced here for clarity)
   ═══════════════════════════════════════════════ */
/* .scroll-progress already defined in utilities.css */


/* ═══════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════ */

/* Tablet: ≤ 1024px */
@media (max-width: 1024px) {
  .nav-links {
    display: none;
  }

  .header-actions {
    display: none;
  }

  .nav-cta {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-drawer {
    display: block; /* enable but still hidden via translateX */
  }
}

/* Large desktop: hide hamburger, show links */
@media (min-width: 1025px) {
  .nav-drawer {
    display: none !important;
  }

  .nav-overlay {
    display: none !important;
  }
}

/* Small mobile tweaks */
@media (max-width: 480px) {
  .logo img {
    height: 38px;
  }

  .nav-drawer {
    width: 100vw;
    padding-left: 20px;
    padding-right: 20px;
  }

  .nav-drawer .drawer-link {
    font-size: 1.05rem;
    padding: 16px 0;
  }
}