#nt-popup, #nt-popup *, #nt-popup *::before, #nt-popup *::after { box-sizing: border-box; }

  #nt-popup {
    /* ==== Tokens (khớp màu website nhatthuc.com.vn) ==== */
    --nt-accent: #0067c0;
    --nt-accent-strong: #00539b;
    --nt-cta: #ea580c;
    --nt-cta-strong: #c2410c;
    --nt-ink: #0f172a;
    --nt-ink-soft: #475569;
    --nt-line: #e2e8f0;
    --nt-surface: #ffffff;
    --nt-field-bg: #f8fafc;
    --nt-radius-lg: 20px;
    --nt-radius-md: 12px;
    --nt-shadow: 0 24px 60px rgba(15, 23, 42, .28);
    --nt-navy-1: #054c92;
    --nt-navy-2: #0a72c9;

    position: fixed;
    inset: 0;
    z-index: 999999;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--nt-ink);
    line-height: 1.5;
  }
  #nt-popup.is-open { display: flex; }

  .nt-popup__overlay {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, .62);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
    opacity: 0;
    transition: opacity .28s ease;
  }
  #nt-popup.is-open .nt-popup__overlay { opacity: 1; }

  .nt-popup__dialog {
    position: relative;
    width: 100%;
    max-width: 860px;
    background: var(--nt-surface);
    border-radius: var(--nt-radius-lg);
    box-shadow: var(--nt-shadow);
    overflow: hidden;
    display: grid;
    grid-template-columns: 1.05fr 1fr;
    opacity: 0;
    transform: translateY(16px) scale(.98);
    transition: opacity .3s ease, transform .3s cubic-bezier(.16, 1, .3, 1);
    max-height: calc(100dvh - 40px);
  }
  #nt-popup.is-open .nt-popup__dialog { opacity: 1; transform: none; }

  .nt-popup__close {
    position: absolute;
    top: 12px;
    right: 12px;
    z-index: 3;
    width: 38px;
    height: 38px;
    display: grid;
    place-items: center;
    border: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, .16);
    color: #fff;
    cursor: pointer;
    transition: background .2s ease, transform .1s ease;
  }
  .nt-popup__close:hover { background: rgba(255, 255, 255, .28); }
  .nt-popup__close:active { transform: scale(.94); }

  .nt-popup__aside {
    position: relative;
    padding: 34px 30px;
    color: #fff;
    background:
      radial-gradient(120% 90% at 100% 0%, rgba(147, 197, 253, .5), transparent 55%),
      linear-gradient(160deg, var(--nt-navy-2) 0%, var(--nt-navy-1) 100%);
    display: flex;
    flex-direction: column;
  }
  .nt-popup__aside::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image: radial-gradient(rgba(255, 255, 255, .12) 1px, transparent 1.5px);
    background-size: 22px 22px;
    opacity: .35;
    pointer-events: none;
  }
  .nt-popup__logo,
  .nt-popup__badge,
  .nt-popup__headline,
  .nt-popup__sub,
  .nt-popup__trust,
  .nt-popup__hotline { position: relative; z-index: 1; }

  .nt-popup__logo {
    align-self: flex-start;
    background: #fff;
    padding: 8px 12px;
    border-radius: 12px;
    margin-bottom: 16px;
    line-height: 0;
    box-shadow: 0 6px 16px rgba(2, 32, 71, .22);
  }
  .nt-popup__logo img { display: block; height: 40px; width: auto; }

  .nt-popup__badge {
    align-self: flex-start;
    display: inline-block;
    margin-bottom: 12px;
    padding: 5px 12px;
    font-size: 12px;
    font-weight: 800;
    letter-spacing: .02em;
    text-transform: uppercase;
    color: #fff;
    background: var(--nt-cta);
    border-radius: 999px;
    box-shadow: 0 4px 12px rgba(234, 88, 12, .35);
  }

  .nt-popup__headline {
    font-size: clamp(22px, 3.4vw, 27px);
    line-height: 1.2;
    font-weight: 800;
    margin: 0 0 12px;
    letter-spacing: -.01em;
  }
  .nt-popup__sub {
    margin: 0 0 22px;
    font-size: 14.5px;
    color: rgba(226, 232, 240, .88);
    max-width: 36ch;
  }

  .nt-popup__trust {
    list-style: none;
    margin: 0 0 auto;
    padding: 0;
    display: grid;
    gap: 12px;
  }
  .nt-popup__trust li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 14px;
    color: rgba(241, 245, 249, .95);
  }
  .nt-popup__trust svg { flex: none; margin-top: 1px; color: #4ade80; }

  .nt-popup__hotline {
    margin-top: 26px;
    padding-top: 18px;
    border-top: 1px solid rgba(255, 255, 255, .16);
  }
  .nt-popup__hotline-label {
    display: block;
    font-size: 11.5px;
    text-transform: uppercase;
    letter-spacing: .12em;
    color: rgba(191, 219, 254, .9);
    margin-bottom: 4px;
  }
  .nt-popup__hotline-num {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: #fff;
    text-decoration: none;
    font-size: 20px;
    font-weight: 800;
    letter-spacing: .01em;
  }
  .nt-popup__hotline-num svg { color: #bfdbfe; }
  .nt-popup__hotline-num:hover { color: #dbeafe; }
  .nt-popup__addr {
    display: flex;
    align-items: flex-start;
    gap: 6px;
    margin: 10px 0 0;
    font-size: 12.5px;
    color: rgba(219, 234, 254, .78);
  }
  .nt-popup__addr svg { flex: none; margin-top: 1px; color: #93c5fd; }

  .nt-popup__main {
    padding: 34px 30px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow-y: auto;
  }
  .nt-popup__form-title {
    margin: 0 0 18px;
    font-size: 19px;
    font-weight: 800;
    color: var(--nt-ink);
  }

  .nt-field { display: grid; gap: 6px; margin-bottom: 14px; }
  .nt-field label { font-size: 13px; font-weight: 600; color: var(--nt-ink-soft); }
  .nt-field input,
  .nt-select select {
    width: 100%;
    height: 46px;
    padding: 0 14px;
    font-size: 15px;
    font-family: inherit;
    color: var(--nt-ink);
    background: var(--nt-field-bg);
    border: 1px solid var(--nt-line);
    border-radius: var(--nt-radius-md);
    outline: none;
    transition: border-color .18s ease, box-shadow .18s ease, background .18s ease;
    appearance: none;
    -webkit-appearance: none;
  }
  .nt-field input::placeholder { color: #94a3b8; }
  .nt-field input:focus,
  .nt-select select:focus {
    border-color: var(--nt-accent);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(0, 103, 192, .18);
  }
  .nt-field input.is-invalid { border-color: #dc2626; box-shadow: 0 0 0 3px rgba(220, 38, 38, .14); }
  .nt-field__error { font-size: 12.5px; color: #dc2626; display: none; }
  .nt-field__error.is-visible { display: block; }

  .nt-select { position: relative; }
  .nt-select select { padding-right: 40px; cursor: pointer; }
  .nt-select svg {
    position: absolute; right: 14px; top: 50%; transform: translateY(-50%);
    color: var(--nt-ink-soft); pointer-events: none;
  }

  .nt-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 48px;
    padding: 0 18px;
    font-family: inherit;
    font-size: 15px;
    font-weight: 700;
    border-radius: var(--nt-radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    white-space: nowrap;
    transition: background .18s ease, border-color .18s ease, transform .08s ease, color .18s ease;
  }
  .nt-btn:active { transform: translateY(1px); }

  .nt-btn--primary {
    position: relative;
    width: 100%;
    margin-top: 4px;
    background: var(--nt-cta);
    color: #fff;
    font-size: 16px;
    box-shadow: 0 10px 18px -8px rgba(194, 65, 12, .65);
  }
  .nt-btn--primary:hover { background: var(--nt-cta-strong); box-shadow: 0 12px 22px -8px rgba(194, 65, 12, .7); }
  .nt-btn__label { display: inline-flex; align-items: center; gap: 8px; }
  .nt-btn--primary .nt-btn__label svg { transition: transform .18s ease; }
  .nt-btn--primary:hover .nt-btn__label svg { transform: translateX(3px); }
  .nt-btn--primary.is-loading { pointer-events: none; opacity: .85; }
  .nt-btn--primary.is-loading .nt-btn__label { visibility: hidden; }

  .nt-btn__spinner {
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2.5px solid rgba(255, 255, 255, .4);
    border-top-color: #fff;
    border-radius: 50%;
    display: none;
    animation: nt-spin .7s linear infinite;
  }
  .nt-btn--primary.is-loading .nt-btn__spinner { display: block; }
  @keyframes nt-spin { to { transform: rotate(360deg); } }

  .nt-popup__alt { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 12px; }
  .nt-btn--ghost { background: #fff; border-color: var(--nt-line); color: var(--nt-ink); font-size: 14px; }
  .nt-btn--ghost svg { color: var(--nt-accent); }
  .nt-btn--ghost:hover { border-color: var(--nt-accent); background: #f8fafc; }

  .nt-popup__note { margin: 14px 0 0; font-size: 12px; color: #94a3b8; text-align: center; }

  .nt-popup__success { text-align: center; padding: 10px 6px; }
  .nt-popup__success-icon {
    width: 66px; height: 66px; margin: 0 auto 16px;
    display: grid; place-items: center; border-radius: 50%;
    background: #dcfce7; color: #16a34a;
  }
  .nt-popup__success-title { margin: 0 0 8px; font-size: 21px; font-weight: 800; }
  .nt-popup__success p { margin: 0 auto 20px; font-size: 14.5px; color: var(--nt-ink-soft); max-width: 36ch; }
  .nt-popup__success .nt-btn--primary { width: auto; display: inline-flex; }

  /* ==== Mobile ==== */
  @media (max-width: 720px) {
    #nt-popup { padding: 0; align-items: flex-end; }
    .nt-popup__dialog {
      grid-template-columns: 1fr;
      max-width: 100%;
      max-height: 92dvh;
      border-radius: 18px 18px 0 0;
      transform: translateY(30px);
      overflow-y: auto;
      -webkit-overflow-scrolling: touch;
    }
    .nt-popup__close { top: 10px; right: 10px; width: 34px; height: 34px; background: rgba(15, 23, 42, .28); }
    .nt-popup__aside { padding: 18px 18px 16px; }
    .nt-popup__trust,
    .nt-popup__hotline { display: none; }
    .nt-popup__logo { margin-bottom: 10px; padding: 6px 10px; }
    .nt-popup__logo img { height: 30px; }
    .nt-popup__badge { margin-bottom: 9px; font-size: 10.5px; padding: 4px 9px; }
    .nt-popup__headline { font-size: 17px; margin-bottom: 6px; }
    .nt-popup__sub { font-size: 12.5px; line-height: 1.45; margin-bottom: 0; max-width: none; }
    .nt-popup__main { padding: 16px 18px 18px; }
    .nt-popup__form-title { display: none; }
    .nt-field { margin-bottom: 10px; }
    .nt-field label { font-size: 12.5px; }
    .nt-field input, .nt-select select { height: 42px; font-size: 14.5px; }
    .nt-btn { height: 44px; }
    .nt-btn--primary { height: 46px; font-size: 15px; }
    .nt-popup__alt { margin-top: 10px; gap: 8px; }
    .nt-popup__note { margin-top: 10px; font-size: 11.5px; }
  }

  @media (max-width: 330px) {
    .nt-popup__alt { grid-template-columns: 1fr; }
  }

  @media (max-width: 720px) and (max-height: 680px) {
    .nt-popup__aside { padding: 16px 20px 14px; }
    .nt-popup__badge { display: none; }
    .nt-popup__headline { font-size: 17px; }
  }

  @media (prefers-reduced-motion: reduce) {
    .nt-popup__overlay, .nt-popup__dialog { transition: none; }
    .nt-btn__spinner { animation: none; }
  }