.header-btn {
      display: inline-block;
      padding: 8px 18px;
      border-radius: 5px;
      text-decoration: none;
      font-family: 'Akrobat', sans-serif;
      font-weight: bold;
      font-size: 16px;
      text-align: center;
      margin-left: 10px;
      transition: all 0.3s ease;
    }
    .header-btn-login {
      background-color: #fff;
      border: 2px solid #fff;
      color: #1a1a1a;
    }
    .header-btn-login:hover {
      background-color: #f0f0f0;
      border-color: #f0f0f0;
      color: #1a1a1a;
    }
    .header-btn-register {
      background-color: #ffc107;
      color: #1a1a1a;
      border: 2px solid #ffc107;
    }
    .header-btn-register:hover {
      background-color: #ffca2c;
      border-color: #ffca2c;
      color: #1a1a1a;
    }
    .buttons-wrap-header {
      display: flex;
      flex-direction: row;
      flex-wrap: nowrap;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
      margin-left: auto;
    }
    .buttons-wrap-header .header-btn {
      margin-left: 0;
    }
    /* Không dùng !important ở đây — cần để JS set display:none sau khi đăng nhập */
    #headerGuestBtns {
      display: inline-flex;
      flex-direction: row;
      flex-wrap: nowrap;
      align-items: center;
      gap: 10px;
    }
    #header .topline-wrap {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: nowrap;
      width: 100%;
    }
    #header .menu-login {
      display: flex;
      flex-direction: row;
      flex-wrap: nowrap;
      align-items: center;
      gap: 14px;
      margin-left: auto;
      flex-shrink: 0;
    }
    #header .menu-login .main-menu {
      flex-shrink: 1;
      min-width: 0;
    }
    /* Control Panel — nổi bật hơn mục menu thường */
    #header .main-menu li a.nav-control-panel {
      font-size: 16px;
      font-weight: 800;
      letter-spacing: 0.12em;
      color: #9a3412;
      padding: 8px 14px;
      margin: 0 -2px;
      border-radius: 10px;
      background: linear-gradient(180deg, rgba(254, 243, 199, 0.85) 0%, rgba(253, 224, 71, 0.35) 100%);
      border: 1px solid rgba(234, 88, 12, 0.45);
      box-shadow: 0 1px 0 rgba(255, 255, 255, 0.65) inset, 0 2px 8px rgba(234, 88, 12, 0.12);
      position: relative;
    }
    #header .main-menu li a.nav-control-panel:hover {
      color: #7c2d12;
      background: linear-gradient(180deg, rgba(254, 240, 138, 0.95) 0%, rgba(252, 211, 77, 0.45) 100%);
      border-color: rgba(234, 88, 12, 0.65);
    }
    .mobile-nav-dropdown a.nav-control-panel {
      font-size: 15px !important;
      font-weight: 800 !important;
      letter-spacing: 0.1em !important;
      text-transform: uppercase !important;
      color: #fef3c7 !important;
      margin: 6px 12px !important;
      padding: 12px 16px !important;
      border-radius: 12px !important;
      background: linear-gradient(135deg, rgba(234, 88, 12, 0.35) 0%, rgba(245, 158, 11, 0.2) 100%) !important;
      border: 1px solid rgba(251, 191, 36, 0.45) !important;
      box-shadow: 0 2px 12px rgba(0, 0, 0, 0.2);
    }
    .mobile-nav-dropdown a.nav-control-panel:hover {
      color: #fffbeb !important;
      background: linear-gradient(135deg, rgba(234, 88, 12, 0.5) 0%, rgba(245, 158, 11, 0.35) 100%) !important;
      border-color: rgba(252, 211, 77, 0.65) !important;
    }
    #header .main-menu li a i.discord {
      position: relative;
      display: inline-block;
      width: 18px;
      height: 18px;
      top: -1px;
      margin-left: 6px;
      vertical-align: middle;
      background: url(../assets/discord.png) no-repeat center / contain;
    }
    .mobile-nav-dropdown a i.youtube {
      position: relative;
      display: inline-block;
      width: 18px;
      height: 18px;
      top: -1px;
      margin-left: 6px;
      vertical-align: middle;
      background: url(../images/youtube.svg) no-repeat center / 18px 18px;
    }
    .mobile-nav-dropdown a .mobile-nav-inline-icon {
      display: inline-block;
      width: 18px;
      height: 18px;
      vertical-align: middle;
      margin-left: 6px;
      position: relative;
      top: -1px;
    }
    /* Đăng nhập: avatar + tên mở dropdown (PC & mobile) — đăng xuất trong menu */
    .header-user-info {
      display: none;
      align-items: center;
      margin-left: 10px;
      position: relative;
      z-index: 210;
      flex-shrink: 0;
      -webkit-tap-highlight-color: transparent;
    }
    /* Mobile — chưa đăng nhập: 2 nút giống header (trên / dưới), mở modal */
    .header-guest-mobile {
      display: none;
      flex-direction: column;
      align-items: stretch;
      justify-content: center;
      gap: 8px;
      margin-left: 10px;
      width: auto;
      min-width: 132px;
      max-width: 200px;
      box-sizing: border-box;
      flex-shrink: 0;
      -webkit-tap-highlight-color: transparent;
    }
    .header-guest-mobile .header-btn {
      margin-left: 0 !important;
      display: block;
      width: 100%;
      box-sizing: border-box;
      cursor: pointer;
      font-family: 'Akrobat', sans-serif;
      border: none;
      -webkit-tap-highlight-color: transparent;
      outline: none;
    }
    .header-guest-mobile .header-btn-login {
      border: 2px solid #fff;
    }
    .header-guest-mobile .header-btn-register {
      border: 2px solid #ffc107;
    }
    .header-guest-mobile .header-btn:focus,
    .header-guest-mobile .header-btn:focus-visible,
    .header-guest-mobile .header-btn:active {
      outline: none;
      box-shadow: none;
    }
    @media (min-width: 769px) {
      .header-guest-mobile {
        display: none !important;
      }
    }
    .header-user-trigger {
      position: relative;
      z-index: 2; /* trên .header-user-dropdown — nếu không, lớp menu chồng lên dòng avatar và bấm “đóng” trúng menu (contains → không toggle) */
      display: inline-flex;
      align-items: center;
      justify-content: flex-start;
      gap: 8px;
      padding: 4px 10px 4px 4px;
      margin: 0;
      width: 180px;
      max-width: 180px;
      box-sizing: border-box;
      border-radius: 0;
      border: none;
      background: transparent;
      cursor: pointer;
      font: inherit;
      line-height: 1;
      transition: opacity 0.2s;
      -webkit-tap-highlight-color: transparent;
      touch-action: manipulation;
      outline: none;
    }
    .header-user-trigger:focus,
    .header-user-trigger:focus-visible,
    .header-user-trigger:active {
      outline: none;
      box-shadow: none;
    }
    .header-user-trigger:hover {
      opacity: 0.92;
    }
    .header-user-info.is-user-menu-open .header-user-trigger {
      opacity: 1;
    }
    .header-user-info.is-user-menu-open .header-user-trigger__caret {
      transform: rotate(180deg);
    }
    .header-user-trigger__caret {
      font-size: 11px;
      color: #64748b;
      transition: transform 0.2s ease;
      flex-shrink: 0;
    }
    .header-user-trigger__name {
      flex: 1;
      min-width: 0;
      color: #2d2828;
      font-family: 'Akrobat', sans-serif;
      font-weight: 800;
      font-size: 14px;
      letter-spacing: 0.02em;
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
      text-align: left;
    }
    .header-user-trigger__coin {
      flex-shrink: 0;
      display: inline-flex;
      align-items: center;
      padding: 2px 8px;
      border-radius: 999px;
      background: linear-gradient(135deg, #fde68a 0%, #fbbf24 100%);
      color: #78350f;
      font-family: 'Akrobat', sans-serif;
      font-weight: 800;
      font-size: 12px;
      letter-spacing: 0.02em;
      line-height: 1;
      white-space: nowrap;
    }
    .header-user-trigger__coin[hidden] { display: none; }

    /* Coin gif — chỉ dùng trong dropdown menu (header-user-dropdown__coin-amount) để
       trang trí số dư. Các vị trí khác giữ icon "fa-coins" + chữ "Coin" như cũ. */
    .coin-icon {
      display: inline-block;
      width: 1.15em;
      height: 1.15em;
      vertical-align: -0.22em;
      object-fit: contain;
      flex-shrink: 0;
      pointer-events: none;
      user-select: none;
    }
    .header-user-info .header-user-avatar {
      width: 40px;
      height: 40px;
      border-radius: 0;
      object-fit: cover;
      object-position: center top;
      border: none;
      background: transparent;
      display: block;
      flex-shrink: 0;
    }
    .header-user-dropdown {
      display: none;
      position: absolute;
      z-index: 1;
      top: 100%;
      right: 0;
      width: 180px;
      box-sizing: border-box;
      padding: 4px 0 6px;
      background: rgba(255, 255, 255, 0.92);
      border: none;
      border-radius: 0;
      box-shadow: 0 8px 28px rgba(15, 23, 42, 0.12);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
    }
    .header-user-dropdown.is-open {
      display: block;
    }
    .header-user-dropdown__item {
      display: flex;
      align-items: center;
      gap: 10px;
      box-sizing: border-box;
      margin: 0 4px;
      width: calc(100% - 8px);
      padding: 10px 12px;
      border: none;
      border-radius: 0;
      background: transparent;
      color: #2d2828;
      font-family: 'Akrobat', sans-serif;
      font-size: 14px;
      font-weight: 700;
      letter-spacing: 0.06em;
      text-transform: uppercase;
      text-align: left;
      text-decoration: none;
      cursor: pointer;
      transition: background 0.15s, color 0.15s;
      -webkit-tap-highlight-color: transparent;
      outline: none;
    }
    .header-user-dropdown__item:focus,
    .header-user-dropdown__item:focus-visible,
    .header-user-dropdown__item:active {
      outline: none;
      box-shadow: none;
    }
    .header-user-dropdown__item:hover {
      background: rgba(255, 193, 7, 0.18);
      color: #9a3412;
    }
    .header-user-dropdown__logout {
      color: #b91c1c;
      border-top: 1px solid rgba(45, 40, 40, 0.1);
      margin: 4px 4px 0;
      width: calc(100% - 8px);
      padding-top: 12px;
      border-radius: 0;
    }
    .header-user-dropdown__logout:hover {
      color: #991b1b;
      background: rgba(220, 38, 38, 0.1);
    }
    .header-user-dropdown__logout img {
      width: 20px;
      height: 20px;
      object-fit: contain;
      flex-shrink: 0;
    }
    .header-user-dropdown__coin-row {
      cursor: default;
      pointer-events: auto;
      text-transform: none;
      letter-spacing: 0.03em;
      display: flex;
      align-items: center;
      justify-content: flex-start;
      gap: 8px;
    }
    .header-user-dropdown__item.header-user-dropdown__coin-row:hover {
      background: transparent !important;
      color: #2d2828;
    }
    .header-user-dropdown__item.header-user-dropdown__coin-row:hover .header-user-dropdown__coin-amount {
      color: #2d2828;
    }
    .header-user-dropdown__coin-amount {
      margin-left: auto;
      flex-shrink: 0;
      font-weight: 800;
      color: #2d2828;
      letter-spacing: 0.03em;
      text-align: right;
      white-space: nowrap;
    }
    .header-vip-tag-wrap {
      position: relative;
      flex: 1 1 auto;
      min-width: 0;
      max-width: 62%;
      display: none;
      align-items: center;
      align-self: stretch;
    }
    .header-vip-tag-wrap.is-visible {
      display: flex;
    }
    .header-vip-tag-wrap:focus {
      outline: none;
    }
    .header-vip-tag-wrap:focus-visible .header-vip-tag {
      box-shadow: 0 0 0 2px rgba(251, 191, 36, 0.65);
    }
    .header-vip-tooltip {
      position: absolute;
      left: 0;
      bottom: calc(100% + 10px);
      min-width: 210px;
      max-width: min(288px, 92vw);
      padding: 10px 14px;
      background: #0f172a;
      color: #f8fafc;
      font-family: 'Akrobat', sans-serif;
      font-size: 12.5px;
      font-weight: 700;
      font-style: normal;
      line-height: 1.45;
      letter-spacing: 0.02em;
      text-transform: none;
      border-radius: 6px;
      border: 1px solid rgba(148, 163, 184, 0.35);
      box-shadow: 0 14px 40px rgba(15, 23, 42, 0.45);
      z-index: 9999;
      opacity: 0;
      visibility: hidden;
      transform: translateY(6px);
      transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s;
      pointer-events: none;
      white-space: pre-line;
      text-align: left;
    }
    .header-vip-tooltip::after {
      content: '';
      position: absolute;
      top: 100%;
      left: 18px;
      margin-top: -1px;
      border: 8px solid transparent;
      border-top-color: #0f172a;
      filter: drop-shadow(0 2px 2px rgba(15, 23, 42, 0.2));
    }
    .header-vip-tag-wrap:hover .header-vip-tooltip,
    .header-vip-tag-wrap:focus-within .header-vip-tooltip {
      opacity: 1;
      visibility: visible;
      transform: translateY(0);
    }
    .header-vip-tag {
      flex: 1 1 auto;
      min-width: 0;
      max-width: 100%;
      display: inline-block;
      padding: 5px 10px;
      font-size: 12px;
      font-weight: 800;
      letter-spacing: 0.03em;
      line-height: 1.25;
      border-radius: 3px;
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
      vertical-align: middle;
      position: relative;
      box-sizing: border-box;
      cursor: help;
    }
    .header-vip-tag--hidden {
      display: none !important;
    }
    .header-vip-tag--none {
      background: #fff !important;
      color: #1e293b !important;
      font-weight: 700 !important;
      font-style: italic;
      letter-spacing: 0.02em !important;
      border: 1px solid rgba(51, 65, 85, 0.55);
      box-shadow: 0 1px 3px rgba(15, 23, 42, 0.12) !important;
      text-shadow: none !important;
      animation: none !important;
    }
    .header-user-dropdown__item.header-user-dropdown__coin-row:hover .header-vip-tag--none {
      color: #0f172a !important;
      border-color: rgba(51, 65, 85, 0.7);
    }
    .header-vip-tag--none::before {
      display: none !important;
    }
    .header-vip-tag--default {
      background: linear-gradient(135deg, rgba(255, 215, 0, 0.75), rgba(255, 179, 71, 0.75));
      color: #3a2a00;
    }
    .header-vip-tag--bac {
      background: linear-gradient(135deg, rgba(192, 192, 192, 0.75), rgba(232, 232, 232, 0.75));
      color: #3a3a3a;
    }
    .header-vip-tag--gold {
      background: linear-gradient(135deg, rgba(255, 215, 0, 0.75), rgba(255, 179, 71, 0.75));
      color: #5c4508;
    }
    .header-vip-tag--platinum,
    .header-vip-tag--moderator {
      background: linear-gradient(135deg, rgba(176, 224, 230, 0.75), rgba(135, 206, 235, 0.75));
      color: #1e4a5c;
    }
    .header-vip-tag--sapphire {
      background: linear-gradient(135deg, rgba(255, 140, 0, 0.75), rgba(255, 165, 0, 0.75));
      color: #4a2800;
    }
    .header-vip-tag--ruby {
      background: linear-gradient(135deg, rgba(220, 20, 60, 0.8), rgba(255, 23, 68, 0.8));
      color: #fff;
    }
    .header-vip-tag--r47 {
      background: linear-gradient(135deg, rgba(255, 200, 0, 0.8), rgba(255, 140, 0, 0.8));
      color: #2a1400;
    }
    .header-vip-tag--r48 {
      background: linear-gradient(135deg, rgba(212, 175, 55, 0.85), rgba(255, 215, 0, 0.85));
      color: #241800;
    }
    .header-vip-tag--r49 {
      background: linear-gradient(135deg, rgba(255, 230, 100, 0.88), rgba(200, 160, 0, 0.88));
      color: #1a1000;
      box-shadow: 0 0 6px rgba(255, 215, 0, 0.45);
    }
    .header-vip-tag--r50 {
      background: linear-gradient(135deg, #7b4f00, #d4a017, #ffe066, #ffd700, #d4a017, #7b4f00);
      background-size: 300% 300%;
      animation: headerVipGoldShift 3s ease infinite, headerVipGoldGlow 2s ease-in-out infinite;
      color: #1a0a00;
      font-weight: 900;
      letter-spacing: 0.06em;
      text-shadow: 0 0 4px rgba(255, 230, 100, 0.85);
      box-shadow: 0 0 10px rgba(255, 215, 0, 0.65);
    }
    .header-vip-tag:not(.header-vip-tag--hidden)::before {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      width: 100%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.35), transparent);
      animation: headerVipShimmer 2.2s infinite;
      pointer-events: none;
    }
    @keyframes headerVipShimmer {
      0% { left: -100%; }
      100% { left: 100%; }
    }
    @keyframes headerVipGoldShift {
      0% { background-position: 0% 50%; }
      50% { background-position: 100% 50%; }
      100% { background-position: 0% 50%; }
    }
    @keyframes headerVipGoldGlow {
      0%, 100% { box-shadow: 0 0 8px rgba(255, 215, 0, 0.65); }
      50% { box-shadow: 0 0 16px rgba(255, 215, 0, 0.95), 0 0 28px rgba(255, 180, 0, 0.45); }
    }
    .header-user-dropdown__item--center {
      justify-content: center;
      text-align: center;
    }

    /* Modal đăng nhập / đăng ký — theme sáng, thông báo phản hồi rõ ràng */
    #siteAuthModal .modal-dialog {
      max-width: 460px;
    }
    #siteAuthModal .modal-content {
      border: none;
      background: transparent;
    }
    #siteAuthModal .site-auth-modal__shell {
      position: relative;
      border: 1px solid rgba(148, 163, 184, 0.45);
      border-radius: 2px;
      overflow: hidden;
      color: #1a1a1a;
      box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.45);
      /* Cover: phủ kín toàn bộ modal (có thể crop nhẹ mép ảnh); không lớp phủ ::before */
      /* Ảnh ở gốc site /images/ — từ css/ phải lên một cấp */
      background-color: #1e293b;
      background-image: url('../images/bg-login.webp');
      background-repeat: no-repeat;
      background-position: center center;
      background-size: cover;
    }
    #siteAuthModal .site-auth-modal__header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 20px 24px 14px;
      border-bottom: 1px solid rgba(148, 163, 184, 0.25);
      background: transparent;
    }
    #siteAuthModal .site-auth-modal__logo {
      height: 36px;
      width: auto;
      max-width: 168px;
      flex-shrink: 0;
      background: none;
      border: none;
      border-radius: 0;
      overflow: visible;
      display: flex;
      align-items: center;
    }
    #siteAuthModal .site-auth-modal__logo img {
      width: auto;
      max-width: 100%;
      height: 100%;
      max-height: 36px;
      object-fit: contain;
      object-position: left center;
      display: block;
      background: transparent;
    }
    #siteAuthModal .site-auth-modal__close {
      background: transparent;
      border: none;
      color: #cbd5e1;
      font-size: 1.75rem;
      line-height: 1;
      width: auto;
      height: auto;
      min-width: 36px;
      min-height: 36px;
      border-radius: 0;
      cursor: pointer;
      padding: 4px;
      transition: color 0.2s;
    }
    #siteAuthModal .site-auth-modal__close:hover {
      background: transparent;
      color: #fff;
    }
    #siteAuthModal .auth-tabs {
      display: flex;
      gap: 0;
      margin: 0;
      padding: 0 24px;
      background: transparent;
      border-bottom: 1px solid rgba(148, 163, 184, 0.25);
    }
    #siteAuthModal .auth-tab {
      flex: 1;
      min-width: 0;
      padding: 14px 12px;
      background: transparent;
      border: none;
      border-bottom: 3px solid transparent;
      color: #cbd5e1;
      font-family: 'Akrobat', sans-serif;
      font-size: 15px;
      font-weight: 800;
      letter-spacing: 0.04em;
      text-transform: uppercase;
      cursor: pointer;
      transition: color 0.2s, border-color 0.2s, background 0.2s;
      white-space: nowrap;
    }
    #siteAuthModal .auth-tab:hover {
      color: #fdba74;
      background: transparent;
    }
    #siteAuthModal .auth-tab.active {
      color: #fb923c;
      border-bottom-color: #ea580c;
      background: transparent;
    }
    #siteAuthModal .site-auth-modal__body {
      padding: 20px 24px 26px;
      background: transparent;
    }
    #siteAuthModal .site-auth-form {
      display: none;
    }
    #siteAuthModal .site-auth-form.active {
      display: block;
    }
    #siteAuthModal .site-auth-alert {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      padding: 14px 16px;
      border-radius: 2px;
      border: 1px solid transparent;
      margin-bottom: 18px;
      font-size: 15px;
      line-height: 1.45;
      font-weight: 600;
    }
    #siteAuthModal .site-auth-alert--hidden {
      display: none !important;
    }
    #siteAuthModal .site-auth-alert__icon {
      flex-shrink: 0;
      margin-top: 2px;
      font-size: 1.2rem;
    }
    #siteAuthModal .site-auth-alert__text {
      flex: 1;
      min-width: 0;
    }
    #siteAuthModal .site-auth-alert--error {
      background: #fef2f2;
      border-color: #fecaca;
      color: #7f1d1d;
    }
    #siteAuthModal .site-auth-alert--error .site-auth-alert__icon {
      color: #dc2626;
    }
    #siteAuthModal .site-auth-alert--success {
      background: #ecfdf5;
      border-color: #a7f3d0;
      color: #064e3b;
    }
    #siteAuthModal .site-auth-alert--success .site-auth-alert__icon {
      color: #059669;
    }
    #siteAuthModal .site-auth-field {
      margin-bottom: 16px;
    }
    #siteAuthModal .site-auth-field label {
      display: block;
      margin-bottom: 6px;
      font-weight: 800;
      font-size: 12px;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      color: #475569;
      font-family: 'Akrobat', sans-serif;
    }
    #siteAuthModal .site-auth-field .form-control {
      width: 100%;
      padding: 12px 14px;
      background: rgba(255, 255, 255, 0.9);
      border: 1px solid rgba(100, 116, 139, 0.45);
      border-radius: 2px;
      color: #0f172a;
      font-size: 15px;
      transition: border-color 0.2s, box-shadow 0.2s;
    }
    #siteAuthModal .site-auth-field .form-control::placeholder {
      color: #94a3b8;
    }
    #siteAuthModal .site-auth-field .form-control:focus {
      outline: none;
      border-color: #f97316;
      box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.2);
    }
    #siteAuthModal .site-auth-field .site-auth-hint {
      display: block;
      margin-top: 6px;
      font-size: 0.82rem;
      color: #c2410c;
      line-height: 1.35;
      font-weight: 600;
    }
    #siteAuthModal .site-auth-field .site-auth-hint--muted {
      color: #64748b;
      text-transform: none;
      letter-spacing: 0;
      font-weight: 500;
    }
    #siteAuthModal .site-auth-field .site-auth-hint--warn {
      color: #dc2626;
    }
    /* Nút submit modal — chữ + mũi tên căn giữa */
    #siteAuthModal .site-auth-head-but {
      width: 100%;
      margin-top: 12px;
      min-height: 52px;
      padding: 12px 16px;
      border: 0;
      border-radius: 2px;
      cursor: pointer;
      display: flex;
      flex-direction: row;
      align-items: center;
      justify-content: center;
      gap: 0;
      position: relative;
      outline: 0 !important;
      font-family: 'Akrobat', sans-serif;
      background: linear-gradient(135deg, #ea580c 0%, #f97316 45%, #fb923c 100%);
      color: #fafafa;
      box-shadow: 0 8px 28px rgba(234, 88, 12, 0.42);
      transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
    }
    #siteAuthModal .site-auth-head-but--register {
      background: linear-gradient(135deg, #c2410c 0%, #ea580c 50%, #f97316 100%);
      box-shadow: 0 8px 28px rgba(194, 65, 12, 0.4);
    }
    #siteAuthModal .site-auth-head-but:hover:not(:disabled) {
      transform: translateY(-3px);
      box-shadow: 0 12px 36px rgba(234, 88, 12, 0.5), 0 4px 0 0 #7c2d12;
      filter: brightness(1.03);
    }
    #siteAuthModal .site-auth-head-but--register:hover:not(:disabled) {
      box-shadow: 0 12px 36px rgba(194, 65, 12, 0.48), 0 4px 0 0 #7c2d12;
    }
    #siteAuthModal .site-auth-head-but:active:not(:disabled) {
      transform: translateY(0);
      filter: brightness(0.98);
    }
    #siteAuthModal .site-auth-head-but:disabled {
      opacity: 0.55;
      cursor: not-allowed;
      box-shadow: none;
      transform: none;
      filter: none;
    }
    #siteAuthModal .site-auth-head-but p {
      margin: 0;
      font-size: 18px;
      font-weight: 800;
      line-height: 1.15;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      color: #fafafa;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      text-align: center;
    }
    #siteAuthModal .site-auth-head-but p > .fa-circle-right {
      font-size: 1.15em;
      opacity: 0.95;
    }
    /* Bước chọn xác thực email: bút sửa cạnh email, bỏ qua = chữ nhỏ dưới nút chính */
    #siteAuthModal .site-email-verify-edit {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin: 0;
      padding: 2px 4px;
      border: none;
      border-radius: 4px;
      background: none;
      color: #0a0a0a;
      cursor: pointer;
      line-height: 1;
      vertical-align: middle;
      transition: color 0.2s, transform 0.15s ease;
      flex-shrink: 0;
      -webkit-tap-highlight-color: transparent;
      filter: drop-shadow(0 0 4px rgba(255, 255, 255, 0.95)) drop-shadow(0 0 1px #fff);
    }
    #siteAuthModal .site-email-verify-edit:hover {
      background: none;
      color: #000;
    }
    #siteAuthModal .site-email-verify-edit:focus-visible {
      outline: 2px solid #fb923c;
      outline-offset: 2px;
    }
    #siteAuthModal .site-email-verify-edit i {
      font-size: 0.95rem;
    }
    #siteAuthModal .site-email-verify-skip-wrap {
      margin: 12px 0 0;
      padding: 0;
      text-align: center;
      line-height: 1.45;
    }
    #siteAuthModal .site-email-verify-skip {
      margin: 0;
      padding: 0;
      border: none;
      background: none;
      font-family: 'Akrobat', sans-serif;
      font-size: 13px;
      font-weight: 800;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      color: #0a0a0a;
      text-decoration: underline;
      text-decoration-color: #b45309;
      text-decoration-thickness: 1px;
      text-underline-offset: 4px;
      text-shadow: 0 0 6px rgba(255, 255, 255, 0.95), 0 0 1px #fff, 0 1px 0 #fff;
      cursor: pointer;
      -webkit-tap-highlight-color: transparent;
      opacity: 1;
    }
    #siteAuthModal .site-email-verify-skip:hover {
      color: #000;
      text-decoration-color: #9a3412;
    }
    #siteAuthModal .site-email-verify-skip:focus-visible {
      outline: 2px solid #fb923c;
      outline-offset: 2px;
      border-radius: 2px;
    }
    #siteAuthModal .site-email-verify-resend-wrap {
      margin: 10px 0 0;
      padding: 0;
      text-align: center;
      line-height: 1.45;
    }
    #siteAuthModal .site-email-verify-resend {
      margin: 0;
      padding: 0;
      border: none;
      background: none;
      font-family: 'Akrobat', sans-serif;
      font-size: 13px;
      font-weight: 800;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      color: #0a0a0a;
      text-decoration: underline;
      text-decoration-color: #b45309;
      text-decoration-thickness: 1px;
      text-underline-offset: 4px;
      text-shadow: 0 0 6px rgba(255, 255, 255, 0.95), 0 0 1px #fff, 0 1px 0 #fff;
      cursor: pointer;
      -webkit-tap-highlight-color: transparent;
      opacity: 1;
    }
    #siteAuthModal .site-email-verify-resend:hover:not(:disabled) {
      color: #000;
      text-decoration-color: #9a3412;
    }
    #siteAuthModal .site-email-verify-resend:disabled {
      color: #1e293b;
      opacity: 0.65;
      cursor: not-allowed;
      text-decoration-color: #64748b;
      text-shadow: 0 0 5px rgba(255, 255, 255, 0.9), 0 1px 0 #fff;
    }
    #siteAuthModal .site-email-verify-resend:focus-visible {
      outline: 2px solid #fb923c;
      outline-offset: 2px;
      border-radius: 2px;
    }
    #siteAuthModal #siteEmailVerifyForm > .site-auth-hint {
      color: #0a0a0a;
      text-shadow: 0 0 6px rgba(255, 255, 255, 0.92), 0 1px 0 #fff;
      font-weight: 600;
    }
    #siteAuthModal #siteEmailVerifyForm > .site-auth-hint strong {
      color: #000;
      font-weight: 800;
    }
    #siteAuthModal #siteEmailVerifyChoicePanel > .site-auth-hint {
      color: #0a0a0a;
      text-shadow: 0 0 6px rgba(255, 255, 255, 0.92), 0 1px 0 #fff;
    }
    #siteAuthModal #siteEmailVerifyChoicePanel .site-auth-hint.site-auth-hint--muted {
      color: #111827;
      text-shadow: 0 0 6px rgba(255, 255, 255, 0.9), 0 1px 0 #fff;
    }
    #siteAuthModal #siteEmailVerifyChoicePanel .site-auth-hint.site-auth-hint--muted strong {
      color: #000;
    }
    /* OTP 6 ô — kiểu iOS */
    #siteAuthModal .site-otp-field {
      margin-bottom: 16px;
    }
    #siteAuthModal .site-otp-label {
      display: block;
      margin: 0 auto 12px;
      width: 100%;
      max-width: 340px;
      box-sizing: border-box;
      padding: 9px 14px;
      text-align: center;
      font-weight: 900;
      font-size: 14px;
      letter-spacing: 0.07em;
      text-transform: uppercase;
      color: #0f172a;
      font-family: 'Akrobat', sans-serif;
      text-shadow: none;
      background: rgba(255, 255, 255, 0.96);
      border: 1px solid rgba(100, 116, 139, 0.4);
      border-radius: 10px;
      box-shadow: 0 2px 12px rgba(15, 23, 42, 0.18);
    }
    #siteAuthModal .site-otp-boxes {
      display: flex;
      flex-direction: row;
      justify-content: space-between;
      align-items: center;
      gap: 6px;
      width: 100%;
      max-width: 340px;
      margin: 0 auto;
    }
    #siteAuthModal .site-otp-digit {
      flex: 1 1 0;
      min-width: 0;
      width: 0;
      max-width: 52px;
      height: 48px;
      box-sizing: border-box;
      padding: 0;
      text-align: center;
      font-size: 22px;
      font-weight: 700;
      font-variant-numeric: tabular-nums;
      line-height: 48px;
      border-radius: 12px;
      border: 1.5px solid rgba(148, 163, 184, 0.55);
      background: rgba(255, 255, 255, 0.96);
      color: #0f172a;
      caret-color: #ea580c;
      transition: border-color 0.15s ease, box-shadow 0.15s ease;
      -webkit-appearance: none;
      appearance: none;
    }
    #siteAuthModal .site-otp-digit::placeholder {
      color: transparent;
    }
    #siteAuthModal .site-otp-digit:focus {
      outline: none;
      border-color: #f97316;
      box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.28);
    }
    @media (max-width: 400px) {
      #siteAuthModal .site-otp-label {
        max-width: 100%;
        font-size: 13px;
        padding: 8px 12px;
      }
      #siteAuthModal .site-otp-boxes {
        gap: 4px;
        max-width: 100%;
      }
      #siteAuthModal .site-otp-digit {
        height: 44px;
        line-height: 44px;
        font-size: 20px;
        border-radius: 10px;
      }
    }
    @media (max-width: 991px) {
      #siteAuthModal .site-auth-reg-confirm {
        display: none !important;
      }
    }
    @media (max-width: 576px) {
      #siteAuthModal .site-auth-modal__header {
        padding: 16px 16px 12px;
      }
      #siteAuthModal .auth-tabs {
        padding: 0 16px;
      }
      #siteAuthModal .site-auth-modal__body {
        padding: 16px 16px 22px;
      }
      #siteAuthModal .auth-tab {
        font-size: 13px;
        padding: 12px 8px;
      }
    }

    /* Đảm bảo dropdown không bị che bởi bottom-sep (z-index: 120) */
    #header .topline {
      position: relative;
      z-index: 200;
    }
    .menu-login {
      position: relative;
      z-index: 200;
    }

    /* Mobile menu FAB: ẩn desktop, cố định góc dưới trái trên mobile */
    .mobile-nav-fab {
      display: none;
    }
    /* Mobile hamburger button */
    .mobile-menu-toggle {
      display: none;
      width: 48px;
      height: 48px;
      border-radius: 12px;
      border: none;
      background: rgba(255, 140, 0, 0.22);
      color: #ff8c00;
      font-size: 20px;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      padding: 0;
      flex-shrink: 0;
      transition: background 0.2s, box-shadow 0.2s;
      box-shadow: 0 6px 24px rgba(0, 0, 0, 0.28), 0 2px 8px rgba(0, 0, 0, 0.12);
    }
    .mobile-menu-toggle:hover {
      background: rgba(255,140,0,0.32);
    }
    .mobile-menu-toggle__icon {
      display: block;
      width: 22px;
      height: 22px;
      object-fit: contain;
      flex-shrink: 0;
    }

    /* Mobile dropdown — fixed trong viewport, luôn nằm trên màn hình, z-index trên hầu hết lớp trang */
    .mobile-nav-dropdown {
      display: none;
      position: fixed;
      left: max(12px, env(safe-area-inset-left, 0px));
      right: auto;
      top: auto;
      bottom: calc(48px + 16px + max(12px, env(safe-area-inset-bottom, 0px)));
      min-width: min(240px, calc(100vw - 24px));
      max-width: min(280px, calc(100vw - 24px));
      max-height: min(420px, calc(100dvh - env(safe-area-inset-top, 0px) - env(safe-area-inset-bottom, 0px) - 100px));
      overflow-x: hidden;
      overflow-y: auto;
      -webkit-overflow-scrolling: touch;
      overscroll-behavior: contain;
      background: rgba(10,14,30,0.97);
      border: 1px solid rgba(148,163,184,0.25);
      border-radius: 14px;
      padding: 8px 0;
      z-index: 100021;
      box-shadow: 0 8px 32px rgba(0,0,0,0.5);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
    }
    .mobile-nav-dropdown.open {
      display: block;
    }
    .mobile-nav-dropdown a {
      display: block;
      padding: 10px 20px;
      color: #e5e7eb;
      font-family: 'Akrobat', sans-serif;
      font-size: 15px;
      font-weight: 600;
      letter-spacing: 0.5px;
      text-decoration: none;
      text-transform: uppercase;
      transition: background 0.15s, color 0.15s;
    }
    .mobile-nav-dropdown a:hover {
      background: rgba(255,255,255,0.07);
      color: #ffc107;
    }
    .mobile-nav-dropdown .mobile-nav-divider {
      height: 1px;
      background: rgba(148,163,184,0.15);
      margin: 6px 14px;
    }
    .mobile-nav-dropdown .mobile-btn-login {
      color: #fff;
      background: rgba(255,255,255,0.08);
      margin: 4px 12px;
      border-radius: 8px;
      padding: 10px 16px;
    }
    .mobile-nav-dropdown .mobile-btn-register {
      color: #1a1a1a;
      background: #ffc107;
      margin: 4px 12px;
      border-radius: 8px;
      padding: 10px 16px;
      font-weight: 800;
    }
    .mobile-nav-dropdown .mobile-btn-register:hover {
      background: #ffca2c;
    }

    @media (max-width: 768px) {
      /* Header layout — khối user/guest sát mép phải */
      #header .topline > .container {
        padding-right: max(0px, env(safe-area-inset-right, 0px)) !important;
      }
      .topline-wrap {
        flex-direction: row !important;
        align-items: center !important;
        justify-content: space-between !important;
        padding: 0 0 0 4px !important;
      }
      .menu-login {
        position: relative !important;
        flex-direction: row !important;
        align-items: center !important;
        justify-content: flex-end !important;
        margin-top: 0 !important;
        gap: 0 !important;
        margin-right: 0 !important;
      }
      .header-guest-mobile,
      .header-user-info {
        margin-left: 0 !important;
        margin-right: 0 !important;
      }
      /* Ẩn menu ngang và nút desktop */
      .main-menu {
        display: none !important;
      }
      .buttons-wrap-header {
        display: none !important;
      }
      /* Nút menu nổi góc dưới trái */
      .mobile-nav-fab {
        display: block;
        position: fixed;
        bottom: max(16px, env(safe-area-inset-bottom, 0px));
        left: max(16px, env(safe-area-inset-left, 0px));
        z-index: 100020;
        pointer-events: none;
      }
      .mobile-nav-fab .mobile-menu-toggle,
      .mobile-nav-fab .mobile-nav-dropdown {
        pointer-events: auto;
      }
      .mobile-nav-fab .mobile-menu-toggle {
        display: inline-flex !important;
        position: relative;
        z-index: 100022;
      }
      /* User menu: rộng theo tên; dropdown lệch trái một chút để không sát mép màn hình */
      #header .header-user-info {
        width: auto;
        max-width: calc(100vw - 20px);
      }
      .header-user-trigger {
        width: auto;
        min-width: 0;
        max-width: min(300px, calc(100vw - 32px));
      }
      .header-user-trigger__name {
        font-size: 13px;
        flex: 0 1 auto;
        max-width: min(220px, calc(100vw - 180px));
      }
      .header-user-trigger__coin {
        font-size: 11px;
        padding: 2px 6px;
      }
      .header-user-dropdown {
        width: max(100%, min(188px, calc(100vw - 32px)));
        min-width: 148px;
        max-width: min(200px, calc(100vw - 20px));
        right: 10px;
        left: auto;
        box-sizing: border-box;
      }
      .header-user-dropdown__item {
        padding-left: 8px;
        padding-right: 8px;
        margin-left: 2px;
        margin-right: 2px;
        width: calc(100% - 4px);
      }
      .header-user-dropdown__logout {
        padding-left: 8px;
        padding-right: 8px;
        margin: 4px 2px 0;
        width: calc(100% - 4px);
      }

      /* Hero section */
      .large-title {
        font-size: 44px !important;
        line-height: 1.05 !important;
      }
      .large-title p {
        letter-spacing: -1px !important;
      }
      .middle-info {
        margin-top: 20px !important;
        padding: 0 8px !important;
      }
      .head-but p {
        font-size: 18px !important;
      }
      .view-video p {
        font-size: 18px !important;
      }

      /* Sections font */
      .font92 {
        line-height: 1.2 !important;
        margin-bottom: 8px !important;
      }
      .font66 {
        line-height: 1.2 !important;
        margin-bottom: 6px !important;
      }
      .title-wrap {
        padding: 0 8px !important;
      }
      .title-wrap p {
        margin-bottom: 10px !important;
      }

      /* Steps */
      .steps-grid > div {
        position: relative !important;
      }
      .steps-grid > div span.step-count {
        position: relative !important;
        bottom: auto !important;
        top: auto !important;
        left: auto !important;
        transform: none !important;
        display: block !important;
        margin: 0 auto 12px !important;
      }
      .steps-grid > div p {
        font-size: 18px !important;
        line-height: 1.3 !important;
      }
      .steps-grid > div p small {
        font-size: 13px !important;
        display: block !important;
        margin-top: 4px !important;
      }
      .white-but {
        font-size: 16px !important;
        padding: 14px 10px !important;
      }
      .platform-btn {
        font-size: 14px !important;
        padding: 10px 14px !important;
      }

      /* Social */
      .groups-wrap > div p:first-child {
        font-size: 22px !important;
      }
    }

    @media (max-width: 480px) {
      .large-title {
        font-size: 36px !important;
      }
      .platform-btn {
        font-size: 12px !important;
        padding: 9px 10px !important;
        letter-spacing: 0 !important;
      }
    }

    .platform-selector {
      text-align: center;
      margin-bottom: 40px;
    }
    .platform-btn {
      background: #333;
      color: #fff;
      border: 2px solid #555;
      padding: 15px 30px;
      font-size: 24px;
      font-family: 'Akrobat', sans-serif;
      font-weight: bold;
      cursor: pointer;
      margin: 0; /* Remove margin */
      transition: all 0.3s ease;
      border-radius: 0; /* Remove individual radius */
    }
    #pc-btn {
      border-top-left-radius: 8px;
      border-bottom-left-radius: 8px;
    }
    #mobile-btn {
      border-top-right-radius: 8px;
      border-bottom-right-radius: 8px;
      margin-left: -2px; /* Collapse borders */
    }
    .platform-btn:hover {
      background: #444;
      border-color: #777;
    }
    .platform-btn.active {
      background: #ffc107;
      color: #1a1a1a;
      border-color: #ffc107;
      z-index: 1;
      position: relative;
    }

  /* Trạng thái đăng nhập từ PHP (session) — tránh FOUT: nút ĐN/ĐK rồi mới thành avatar */
  #header.site-chrome-initial--user #headerGuestBtns {
    display: none !important;
  }
  #header.site-chrome-initial--user .header-user-info {
    display: flex !important;
  }
  #header.site-chrome-initial--user #headerGuestMobile {
    display: none !important;
  }
  #header.site-chrome-initial--guest .header-user-info {
    display: none !important;
  }
  #header.site-chrome-initial--guest #headerGuestBtns {
    display: inline-flex !important;
  }
  /* FAB mobile: khi header báo user (phiên PHP) — ẩn nút ĐN/ĐK ở menu nổi */
  body:has(#header.site-chrome-initial--user) .mobile-nav-fab .mobile-btn-login,
  body:has(#header.site-chrome-initial--user) .mobile-nav-fab .mobile-btn-register {
    display: none !important;
  }

  /* Sau đăng ký: chọn xác minh email hoặc lúc khác (không gắn session) */
  .site-reg-success-modal__shell {
    background: #1a1a1a;
    color: #f3f4f6;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
  }
  .site-reg-success-modal__body {
    padding: 28px 24px 24px;
    text-align: center;
  }
  .site-reg-success-modal__icon {
    display: block;
    margin: 0 auto 16px;
    max-width: 100%;
    height: auto;
  }
  .site-reg-success-modal__text {
    font-family: 'Akrobat', sans-serif;
    font-size: 1.2rem;
    line-height: 1.45;
    margin: 0 0 20px;
    color: #e5e7eb;
  }
  .site-reg-success-modal__primary {
    display: block;
    width: 100%;
    max-width: 280px;
    margin: 0 auto 8px;
    padding: 12px 20px;
    font-family: 'Akrobat', sans-serif;
    font-weight: 800;
    font-size: 1.05rem;
    border: none;
    border-radius: 8px;
    color: #fff;
    background: #2563eb;
    box-shadow: 0 2px 10px rgba(37, 99, 235, 0.45);
  }
  .site-reg-success-modal__primary:hover,
  .site-reg-success-modal__primary:focus {
    color: #fff;
    background: #1d4ed8;
  }
  .site-reg-success-modal__primary:disabled {
    opacity: 0.6;
    cursor: wait;
  }
  .site-reg-success-modal__later {
    display: block;
    width: 100%;
    margin: 0 auto;
    padding: 6px 12px;
    font-size: 0.95rem;
    color: #94a3b8;
    background: none;
    border: none;
    text-decoration: underline;
  }
  .site-reg-success-modal__later:hover,
  .site-reg-success-modal__later:focus {
    color: #cbd5e1;
  }

  /* Loading toàn trang (form /auth qua site-auth.js) */
  .site-auth-global-loading {
    position: fixed;
    inset: 0;
    z-index: 200000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: rgba(0, 0, 0, 0.55);
    -webkit-backdrop-filter: blur(2px);
    backdrop-filter: blur(2px);
    pointer-events: all;
  }
  .site-auth-global-loading[hidden] {
    display: none !important;
  }
  .site-auth-global-loading__panel {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 22px 28px;
    background: #1f2937;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.45);
  }
  .site-auth-global-loading__spin {
    font-size: 2rem;
    color: #facc15;
  }
  .site-auth-global-loading__text {
    font-family: 'Akrobat', sans-serif;
    font-weight: 700;
    font-size: 1.05rem;
    color: #e5e7eb;
  }