/* ============================================================
   CiCC Theme 4.0 — Header (Unified across ecosystem)
   Class naming matches lean.vn / leansigmavn.com
   ============================================================ */

@layer components {
  /* ===========================
     TOP BAR
     =========================== */
  .top-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--topbar-height);
    background: #ffffff;
    border-bottom: 1px solid var(--gray-100);
    z-index: var(--z-sticky);
    display: flex;
  }

  .top-bar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0 var(--container-padding);
    max-width: var(--container-max);
    margin: 0 auto;
    width: 100%;
  }

  .top-bar-left {
    display: flex;
    align-items: center;
    gap: 4px;
    flex-shrink: 0;
  }

  .top-lang {
    color: var(--gray-400);
    text-decoration: none;
    font-weight: 500;
    font-size: 11px;
    transition: color var(--transition-fast);
    padding: 2px 6px;
    border-radius: 4px;
  }
  .top-lang:hover { color: var(--cicc-blue); background: var(--gray-100); }
  .top-lang.active { color: var(--cicc-blue); font-weight: 600; background: var(--cicc-blue-100); }

  .top-lang-sep { color: var(--gray-200); font-size: 9px; }
  .top-sep { color: var(--gray-200); font-size: 10px; margin: 0 4px; }

  .top-bar-center {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    max-width: 400px;
    margin: 0 16px;
  }

  .top-search-form-inline {
    display: flex;
    align-items: center;
    gap: 6px;
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: 20px;
    padding: 0 12px;
    width: 100%;
    height: 26px;
    transition: border 0.2s, background 0.2s;
  }
  .top-search-form-inline:focus-within {
    border-color: var(--cicc-blue);
    background: #ffffff;
    box-shadow: 0 0 0 2px rgba(0,87,163,0.08);
  }

  .top-search-icon { flex-shrink: 0; color: var(--gray-300); }

  .top-search-form-inline input {
    flex: 1;
    background: none;
    border: none;
    outline: none;
    color: var(--gray-700);
    font-size: 12px;
    min-width: 0;
  }

  .top-search-form-inline input::placeholder {
    color: var(--gray-400);
    font-size: 11px;
  }

  .top-bar-right {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
  }

  .top-phone, .top-email, .top-login-text {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--gray-500);
    text-decoration: none;
    font-size: 11.5px;
    font-weight: 500;
    transition: color var(--transition-fast);
    white-space: nowrap;
  }

  .top-phone svg, .top-email svg, .top-login-text svg {
    flex-shrink: 0;
    color: var(--gray-400);
  }

  .top-phone:hover, .top-email:hover, .top-login-text:hover { color: var(--cicc-blue); }
  .top-phone:hover svg, .top-email:hover svg, .top-login-text:hover svg { color: var(--cicc-blue); }

  .top-cta {
    font-size: 11px;
    font-weight: 700;
    padding: 4px 14px;
    border-radius: 5px;
    text-decoration: none;
    transition: all 0.25s ease;
    margin-left: 6px;
    color: #fff !important;
    letter-spacing: 0.02em;
    position: relative;
  }
  .top-cta--trial {
    background: linear-gradient(135deg, #16a34a, #22c55e);
    box-shadow: 0 2px 8px rgba(22,163,74,0.3);
  }
  .top-cta--trial:hover {
    background: linear-gradient(135deg, #15803d, #16a34a);
    box-shadow: 0 4px 14px rgba(22,163,74,0.45);
    transform: translateY(-1px);
    color: #fff !important;
  }
  .top-cta--trial:active {
    transform: translateY(0);
  }
  .top-cta--contact {
    background: linear-gradient(135deg, #0057a3, #3b82f6);
    box-shadow: 0 2px 8px rgba(0,87,163,0.3);
  }
  .top-cta--contact:hover {
    background: linear-gradient(135deg, #004080, #0057a3);
    box-shadow: 0 4px 14px rgba(0,87,163,0.45);
    transform: translateY(-1px);
    color: #fff !important;
  }
  .top-cta--contact:active {
    transform: translateY(0);
  }

  .top-login-text {
    background: var(--cicc-blue-100);
    color: var(--cicc-blue);
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
  }

  .top-btn-register {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 12px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    background: var(--cicc-orange);
    color: #ffffff;
    text-decoration: none;
    transition: all var(--transition-fast);
  }
  .top-btn-register:hover {
    background: #ea580c;
    color: #ffffff;
  }

  @media (max-width: 1024px) {
    .top-bar-center { display: none; }
    .top-phone span, .top-email { display: none; }
  }
  @media (max-width: 768px) {
    .top-bar-left .show-mobile-tag { display: block !important; }
  }

  /* ===========================
     SITE HEADER
     =========================== */
  .site-header {
    position: fixed;
    top: var(--topbar-height);
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    z-index: var(--z-sticky);
    transition: background 0.3s, border-bottom 0.3s, box-shadow 0.3s, transform 0.35s ease;
  }

  .site-header.scrolled {
    background: rgba(255,255,255,0.98);
    border-bottom-color: var(--gray-200);
    box-shadow: var(--shadow-sm);
  }

  .site-header.hidden {
    transform: translateY(-100%);
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0 var(--container-padding);
    max-width: var(--container-max);
    margin: 0 auto;
  }

  /* Logo */
  .logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    flex-shrink: 0;
  }

  .logo img {
    height: 40px;
    width: auto;
    max-width: 180px;
  }

  .logo-icon {
    font-size: 24px;
    line-height: 1;
  }

  .logo-text {
    font-family: var(--font-heading);
    font-size: 26px;
    font-weight: 800;
    color: var(--cicc-navy);
    letter-spacing: -1px;
    line-height: 1;
  }

  .logo-text-suffix {
    font-size: 11px;
    font-weight: 500;
    color: var(--gray-400);
    letter-spacing: 0;
    display: block;
    line-height: 1.2;
  }

  /* ===========================
     NAVIGATION
     =========================== */
  .main-nav { display: flex; }

  .nav-list {
    display: flex;
    gap: 2px;
    list-style: none;
    margin: 0;
    padding: 0;
  }

  .nav-list li {
    position: relative;
    display: flex;
    align-items: center;
    height: var(--header-height);
  }

  .nav-list > li > a {
    display: flex;
    align-items: center;
    font-size: 13px;
    padding: 0 10px;
    gap: 4px;
    padding: 6px 12px;
    font-size: 13.5px;
    font-weight: 500;
    color: var(--gray-600);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
  }

  .nav-list > li > a:hover,
  .nav-list > .current-menu-item > a,
  .nav-list > .current_page_item > a {
    color: var(--cicc-blue);
    background: var(--cicc-blue-100);
  }

  .nav-arrow {
    font-size: 9px;
    margin-left: 2px;
    transition: transform 0.2s;
    display: inline-block;
  }

  .nav-list li:hover > a .nav-arrow {
    transform: rotate(180deg);
  }

  /* ===========================
     MEGA MENU
     =========================== */
  .mega-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    min-width: 760px;
    background: #ffffff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-2xl);
    padding: var(--space-6);
    z-index: var(--z-dropdown);
  }

  .nav-list li:hover .mega-menu {
    display: block;
    animation: megaFadeIn 0.2s ease;
  }

  @keyframes megaFadeIn {
    from { opacity: 0; transform: translateX(-50%) translateY(6px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
  }

  .mega-inner {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-6);
  }

  .mega-inner--5col {
    grid-template-columns: repeat(5, 1fr);
  }

  .mega-col {
    display: flex;
    flex-direction: column;
    gap: 6px;
  }

  .mega-label {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--gray-400);
    margin-bottom: var(--space-2);
    padding-bottom: var(--space-2);
    border-bottom: 1px solid var(--gray-100);
  }

  .mega-count {
    font-size: 10px;
    font-weight: 700;
    color: var(--cicc-blue);
    background: var(--cicc-blue-100);
    display: inline-block;
    padding: 1px 10px;
    border-radius: 20px;
    margin-bottom: var(--space-2);
    letter-spacing: 0.02em;
  }

  .mega-col a {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 7px 10px;
    font-size: 13px;
    font-weight: 500;
    color: var(--gray-600);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all var(--transition-fast);
    line-height: 1.3;
  }

  .mega-col a:hover {
    background: var(--cicc-blue-100);
    color: var(--cicc-blue);
    padding-left: 14px;
  }

  .mega-col a.mega-all {
    margin-top: 4px;
    font-weight: 700;
    color: var(--cicc-blue);
    font-size: 12px;
    border-top: 1px solid var(--gray-100);
    padding-top: 10px;
    border-radius: 0;
  }

  .mega-col a.mega-all:hover {
    background: none;
    color: var(--cicc-blue-600);
    padding-left: 14px;
  }
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    background: var(--gray-50);
    border-radius: var(--radius-md);
    font-size: 13px;
    font-weight: 600;
    color: var(--gray-700);
    text-decoration: none;
    transition: all var(--transition-fast);
  }
  .mega-feat-item:hover {
    background: var(--cicc-blue-100);
    color: var(--cicc-blue);
  }

  .mega-feat-icon {
    font-size: 18px;
    width: 32px;
    text-align: center;
  }

  .mega-feat-item small {
    font-weight: 400;
    font-size: 11px;
    color: var(--gray-400);
    display: block;
  }

  .mega-all {
    display: block;
    text-align: center;
    margin-top: 8px;
    font-size: 13px;
    font-weight: 700;
    color: var(--cicc-blue);
    border-top: 1px solid var(--gray-100);
    padding-top: 10px;
  }
    padding: 10px;
    margin-top: auto;
    font-size: 13px;
    font-weight: 600;
    color: var(--cicc-blue);
    border: 1px dashed var(--gray-200);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all var(--transition-fast);
  }
  .mega-all:hover {
    background: var(--cicc-blue);
    color: #ffffff;
    border-color: var(--cicc-blue);
  }

  /* Sub-menu (regular dropdown for non-mega) */
  .nav-list ul.sub-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    background: #ffffff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 8px;
    z-index: var(--z-dropdown);
  }

  .nav-list li:hover > ul.sub-menu {
    display: block;
    animation: headerFadeIn 0.2s ease;
  }

  @keyframes headerFadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .nav-list ul.sub-menu li { height: auto; }
  .nav-list ul.sub-menu a {
    padding: 8px 16px;
    font-size: 13px;
    border-radius: var(--radius-md);
  }
  .nav-list ul.sub-menu a:hover {
    background: var(--gray-50);
  }

  /* ===========================
     HEADER ACTIONS
     =========================== */
  .header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
  }

  .btn-header-search {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 3px 10px;
    border-radius: 20px;
    border: 1.5px solid var(--gray-200);
    background: var(--gray-50);
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
  }
  .btn-header-search:hover {
    background: linear-gradient(135deg, var(--cicc-blue-100), #eef2ff);
    border-color: var(--cicc-blue);
    box-shadow: 0 0 16px rgba(0,87,163,0.15);
    transform: scale(1.03);
  }
  .btn-header-search svg {
    stroke: var(--gray-400);
    transition: stroke 0.3s;
  }
  .btn-header-search:hover svg {
    stroke: var(--cicc-blue);
  }
  .btn-header-search span {
    font-size: 10px;
    font-weight: 600;
    color: var(--gray-400);
    transition: color 0.3s;
    letter-spacing: 0.02em;
  }
  .btn-header-search:hover span {
    color: var(--cicc-blue);
  }
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    color: var(--gray-400);
    transition: all var(--transition-fast);
    background: none;
    border: none;
    cursor: pointer;
  }
  .btn-header-search:hover {
    background: var(--gray-50);
    color: var(--cicc-blue);
  }

  .btn-header-trial {
    padding: 7px 18px;
    font-size: 12.5px;
    font-weight: 600;
    border-radius: var(--radius-full);
    text-decoration: none;
    transition: all var(--transition-fast);
    background: transparent;
    color: var(--cicc-blue);
    border: 1.5px solid var(--cicc-blue);
  }
  .btn-header-trial:hover {
    background: var(--cicc-blue);
    color: #ffffff;
    transform: translateY(-1px);
  }

  .btn-header-register {
    padding: 7px 18px;
    font-size: 12.5px;
    font-weight: 600;
    border-radius: var(--radius-full);
    text-decoration: none;
    transition: all var(--transition-fast);
    background: var(--cicc-orange);
    color: #ffffff;
  }
  .btn-header-register:hover {
    background: #ea580c;
    transform: translateY(-1px);
    color: #ffffff;
  }

  /* Mobile Toggle */
  .mobile-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    color: var(--gray-600);
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
  }
  .mobile-toggle:hover {
    background: var(--gray-100);
  }

  .icon-menu { width: 24px; height: 24px; }

  @media (max-width: 1024px) {
    .main-nav { display: none; }
    .header-actions .btn-header-trial,
    .header-actions .btn-header-register { display: none; }
    .mobile-toggle { display: flex; }
  }

  /* ===========================
     SEARCH OVERLAY
     =========================== */
  .search-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 9999;
    background: rgba(15,23,42,0.97);
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
    min-height: 300px;
  }
  .search-overlay--open { display: flex; }

  .search-overlay__close {
    position: absolute;
    top: 24px;
    right: 24px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    color: #ffffff;
    font-size: var(--text-xl);
    border: none;
    cursor: pointer;
  }

  .search-overlay__box { width: 100%; max-width: 560px; }

  .search-overlay__box input {
    width: 100%;
    padding: 16px 24px;
    font-size: var(--text-lg);
    border: 2px solid rgba(255,255,255,0.2);
    border-radius: var(--radius-xl);
    background: rgba(255,255,255,0.06);
    color: #ffffff;
    outline: none;
    font-family: inherit;
  }
  .search-overlay__box input:focus {
    border-color: var(--cicc-blue-light);
  }
  .search-overlay__box input::placeholder {
    color: rgba(255,255,255,0.4);
  }

  /* ===========================
     MOBILE NAV (Premium Overlay)
     =========================== */
  .mobile-nav {
    display: none;
    position: fixed;
    top: var(--total-header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15,23,42,0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: var(--z-overlay);
    padding: var(--space-6);
    overflow-y: auto;
  }
  .mobile-nav--open { display: block; }

  .mobile-nav-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid rgba(255,255,255,0.08);
  }

  .mobile-nav-logo {
    font-family: var(--font-heading);
    font-size: 20px;
    font-weight: 800;
    color: #ffffff;
    text-decoration: none;
    letter-spacing: -0.5px;
  }

  .mobile-close-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    border: none;
    color: #ffffff;
    cursor: pointer;
    transition: background var(--transition-fast);
  }
  .mobile-close-btn:hover { background: rgba(255,255,255,0.2); }

  .mobile-search-form {
    margin-bottom: var(--space-6);
  }

  .mobile-search-form input {
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255,255,255,0.15);
    background: rgba(255,255,255,0.06);
    color: #ffffff;
    font-size: 14px;
    outline: none;
    font-family: inherit;
    box-sizing: border-box;
  }
  .mobile-search-form input:focus {
    border-color: var(--cicc-blue-light);
  }
  .mobile-search-form input::placeholder {
    color: rgba(255,255,255,0.35);
  }

  .mobile-nav-group {
    margin-bottom: var(--space-5);
  }

  .mobile-nav-label {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: rgba(255,255,255,0.3);
    margin-bottom: var(--space-2);
    padding-bottom: var(--space-2);
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }

  .mobile-nav-group a {
    display: block;
    padding: 12px 0;
    font-size: 15px;
    font-weight: 500;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    border-bottom: 1px solid rgba(255,255,255,0.04);
    transition: all var(--transition-fast);
  }
  .mobile-nav-group a:hover {
    color: #ffffff;
    padding-left: 8px;
  }

  .mobile-nav-contact {
    margin-top: var(--space-6);
    padding-top: var(--space-4);
    border-top: 1px solid rgba(255,255,255,0.08);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
  }

  .mobile-nav-contact a {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: rgba(255,255,255,0.5);
    font-size: 13px;
    text-decoration: none;
    transition: color var(--transition-fast);
  }
  .mobile-nav-contact a:hover { color: #ffffff; }

  .mobile-eco {
    margin-top: var(--space-6);
    padding: var(--space-4);
    background: rgba(255,255,255,0.05);
    border-radius: var(--radius-lg);
  }

  .mobile-eco > span {
    display: block;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: rgba(255,255,255,0.3);
    margin-bottom: var(--space-3);
  }

  .mobile-eco-links {
    display: flex;
    gap: var(--space-3);
  }

  .mobile-eco-links a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 500;
    color: rgba(255,255,255,0.7);
    background: rgba(255,255,255,0.06);
    text-decoration: none;
    transition: all var(--transition-fast);
  }
  .mobile-eco-links a:hover {
    background: rgba(255,255,255,0.12);
    color: #ffffff;
  }
}