:root {
      --bg: #05070a;
      --bg-soft: #0b0f18;
      --bg-alt: #101827;
      --primary: #e53935;
      --primary-soft: rgba(229,57,53,0.14);
      --accent: #ffc107;
      --text: #f4f6fb;
      --muted: #9ca3af;
      --border: #1f2933;
      --radius-lg: 18px;
      --radius-xl: 24px;
      --shadow-soft: 0 18px 40px rgba(0,0,0,0.45);
      --max-width: 1120px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html, body {
      background: radial-gradient(circle at top, #111827 0, #05070a 42%, #020308 100%);
      color: var(--text);
      font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      line-height: 1.6;
      scroll-behavior: smooth;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    img {
      max-width: 100%;
      display: block;
    }

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 1.25rem;
    }

    /* HEADER */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      backdrop-filter: blur(18px);
      background: linear-gradient(to bottom, rgba(5,7,10,0.92), rgba(5,7,10,0.78), transparent);
      border-bottom: 1px solid rgba(148,163,184,0.14);
    }

    .header-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: .75rem 0;
      gap: 1rem;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: .65rem;
      font-weight: 600;
      font-size: .98rem;
      letter-spacing: .06em;
      text-transform: uppercase;
    }

    .brand img {
      width: 40px;
      height: 40px;
      border-radius: 999px;
      object-fit: cover;
      border: 2px solid rgba(252, 211, 77, 0.7);
      box-shadow: 0 0 18px rgba(234,179,8,0.5);
    }

    .brand span small {
      display: block;
      font-size: .7rem;
      text-transform: none;
      color: var(--muted);
      letter-spacing: 0;
    }

    .nav-toggle {
      display: none;
      background: none;
      border: 1px solid rgba(148,163,184,0.6);
      border-radius: 999px;
      width: 42px;
      height: 42px;
      padding: 0;
      align-items: center;
      justify-content: center;
      gap: 4px;
      flex-direction: column;
      cursor: pointer;
    }

    .nav-toggle span {
      width: 18px;
      height: 2px;
      border-radius: 999px;
      background: #e5e7eb;
      transition: .2s;
    }

    .nav-toggle[aria-expanded="true"] span:nth-child(1) {
      transform: translateY(4px) rotate(45deg);
    }
    .nav-toggle[aria-expanded="true"] span:nth-child(2) {
      opacity: 0;
    }
    .nav-toggle[aria-expanded="true"] span:nth-child(3) {
      transform: translateY(-4px) rotate(-45deg);
    }

    .main-nav ul {
      list-style: none;
      display: flex;
      align-items: center;
      gap: .75rem;
      font-size: .86rem;
    }

    .main-nav a {
      color: var(--muted);
      padding: .4rem .7rem;
      border-radius: 999px;
      transition: background .16s ease, color .16s ease, transform .12s ease;
      white-space: nowrap;
    }

    .main-nav a:hover {
      background: rgba(31,41,55,0.8);
      color: #e5e7eb;
      transform: translateY(-1px);
    }

    .nav-cta {
      color: #111827 !important;
      background: linear-gradient(135deg, #f97316, #facc15);
      font-weight: 600;
      box-shadow: 0 10px 26px rgba(248,250,252,0.25);
    }

    .nav-cta:hover {
      background: linear-gradient(135deg, #f59e0b, #fde047);
    }

    /* HERO */
    .hero {
      padding: 1.5rem 0 2.5rem;
    }

    .hero-grid {
      display: grid;
      gap: 1.75rem;
      align-items: stretch;
    }

    @media (min-width: 880px) {
      .hero-grid {
        grid-template-columns: minmax(0, 1.6fr) minmax(0, 1.1fr);
      }
    }

    .badge-row {
      display: inline-flex;
      align-items: center;
      gap: .5rem;
      padding: .2rem .4rem;
      border-radius: 999px;
      background: rgba(15,23,42,0.9);
      border: 1px solid rgba(248, 113, 113, 0.45);
      margin-bottom: .9rem;
      box-shadow: 0 10px 30px rgba(0,0,0,.7);
    }

    .badge-dot {
      width: 9px;
      height: 9px;
      border-radius: 999px;
      background: #22c55e;
      box-shadow: 0 0 0 6px rgba(34,197,94,0.25);
    }

    .badge-row span {
      font-size: .78rem;
      color: var(--muted);
    }

    .hero-title {
      font-size: clamp(1.85rem, 3.2vw, 2.45rem);
      line-height: 1.25;
      font-weight: 700;
      letter-spacing: .01em;
      margin-bottom: .6rem;
    }

    .hero-title strong {
      color: var(--accent);
    }

    .hero-sub {
      color: var(--muted);
      font-size: .95rem;
      max-width: 32rem;
      margin-bottom: 1.1rem;
    }

    .hero-badges {
      display: flex;
      flex-wrap: wrap;
      gap: .45rem;
      margin-bottom: 1.2rem;
    }

    .hero-badges span {
      font-size: .75rem;
      padding: .35rem .65rem;
      border-radius: 999px;
      border: 1px solid rgba(148,163,184,0.5);
      background: rgba(15,23,42,0.85);
      color: #e5e7eb;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: .6rem;
      margin-bottom: 1.3rem;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: .4rem;
      padding: .68rem 1.1rem;
      border-radius: 999px;
      border: 1px solid transparent;
      font-size: .9rem;
      font-weight: 600;
      cursor: pointer;
      transition: background .18s ease, color .18s ease, transform .1s ease, box-shadow .18s ease, border-color .18s ease;
    }

    .btn-lg {
      padding: .78rem 1.4rem;
      font-size: .95rem;
    }

    .btn-primary {
      background: linear-gradient(135deg, #ef4444, #f97316);
      color: #111827;
      box-shadow: 0 18px 40px rgba(248,113,113,0.35);
    }

    .btn-primary:hover {
      transform: translateY(-1px);
      box-shadow: 0 22px 48px rgba(248,113,113,0.45);
      background: linear-gradient(135deg, #f97316, #facc15);
    }

    .btn-outline {
      background: rgba(15,23,42,0.9);
      border-color: rgba(148,163,184,0.7);
      color: #e5e7eb;
    }

    .btn-outline:hover {
      border-color: #e5e7eb;
      background: rgba(30,64,175,0.32);
      transform: translateY(-1px);
    }

    .hero-note {
      font-size: .8rem;
      color: var(--muted);
    }

    .hero-note strong {
      color: #e5e7eb;
    }

    .hero-card {
      position: relative;
      background: radial-gradient(circle at top left, rgba(248,113,113,0.18), transparent 52%), linear-gradient(145deg, #020617, #020617 40%, #111827 100%);
      border-radius: var(--radius-xl);
      border: 1px solid rgba(148,163,184,0.32);
      padding: 1.2rem 1.1rem 1.1rem;
      box-shadow: var(--shadow-soft);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      gap: 1rem;
    }

    .hero-card::before {
      content: "";
      position: absolute;
      inset: -20%;
      background: radial-gradient(circle at 0 0, rgba(248, 250, 252, 0.18), transparent 55%);
      opacity: .9;
      pointer-events: none;
    }

    .hero-card-inner {
      position: relative;
      z-index: 1;
    }

    .tag-pill {
      display: inline-flex;
      align-items: center;
      gap: .4rem;
      padding: .25rem .55rem;
      border-radius: 999px;
      background: rgba(15,23,42,0.7);
      border: 1px solid rgba(148,163,184,0.6);
      font-size: .72rem;
      color: var(--muted);
      margin-bottom: .4rem;
    }

    .tag-pill span {
      font-weight: 600;
      color: #f9fafb;
    }

    .hotline-big {
      font-size: 1.5rem;
      font-weight: 700;
      letter-spacing: .08em;
      margin-bottom: .3rem;
    }

    .hotline-big span {
      color: var(--accent);
    }

    .status-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: .4rem;
      margin-bottom: .7rem;
      font-size: .78rem;
      color: var(--muted);
    }

    .status-pill {
      display: inline-flex;
      align-items: center;
      gap: .35rem;
      padding: .25rem .6rem;
      border-radius: 999px;
      background: rgba(22,163,74,0.12);
      border: 1px solid rgba(22,163,74,0.6);
      color: #bbf7d0;
      font-size: .75rem;
    }

    .status-dot {
      width: 8px;
      height: 8px;
      border-radius: 999px;
      background: #22c55e;
      box-shadow: 0 0 0 4px rgba(34,197,94,.3);
    }

    .hero-card-list {
      list-style: none;
      font-size: .8rem;
      display: grid;
      gap: .35rem;
      margin-bottom: 1rem;
      color: var(--muted);
    }

    .hero-card-list li::before {
      content: "✔";
      color: #22c55e;
      margin-right: .45rem;
      font-size: .75rem;
    }

    .grid-2 {
      display: grid;
      gap: .55rem;
      margin-bottom: 1rem;
      font-size: .78rem;
    }

    @media (min-width: 520px) {
      .grid-2 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }
    }

    .pill-label {
      padding: .45rem .6rem;
      border-radius: .9rem;
      background: rgba(15,23,42,.85);
      border: 1px solid rgba(148,163,184,0.6);
    }

    .pill-label span {
      display: block;
      font-size: .9em;
      color: var(--muted);
    }

    .pill-label strong {
      font-size: .96em;
    }

    .hero-card-actions {
      display: flex;
      flex-wrap: wrap;
      gap: .6rem;
    }

    /* SECTIONS */
    section {
      padding: 2.25rem 0;
    }

    .section-head {
      text-align: left;
      margin-bottom: 1.5rem;
    }

    .section-eyebrow {
      text-transform: uppercase;
      letter-spacing: .16em;
      font-size: .7rem;
      color: var(--muted);
      margin-bottom: .2rem;
    }

    .section-title {
      font-size: 1.35rem;
      margin-bottom: .3rem;
    }

    .section-desc {
      font-size: .9rem;
      color: var(--muted);
      max-width: 34rem;
    }

    .section-alt {
      background: radial-gradient(circle at top, #020617 0, #05070a 70%);
      border-top: 1px solid rgba(15,23,42,0.8);
      border-bottom: 1px solid rgba(15,23,42,0.8);
    }

    .grid-3 {
      display: grid;
      gap: 1rem;
    }

    @media (min-width: 768px) {
      .grid-3 {
        grid-template-columns: repeat(3, minmax(0,1fr));
      }
    }

    .card {
      background: rgba(15,23,42,0.95);
      border-radius: var(--radius-lg);
      border: 1px solid rgba(148,163,184,0.25);
      padding: 1rem;
      box-shadow: 0 16px 32px rgba(0,0,0,0.55);
      position: relative;
      overflow: hidden;
    }

    .card h3 {
      font-size: 1rem;
      margin-bottom: .4rem;
    }

    .card p {
      font-size: .86rem;
      color: var(--muted);
    }

    .card-tag {
      font-size: .7rem;
      text-transform: uppercase;
      letter-spacing: .16em;
      color: var(--muted);
      margin-bottom: .2rem;
    }

    /* LÝ DO CHỌN */
    .list-check {
      list-style: none;
      display: grid;
      gap: .4rem;
      font-size: .86rem;
      color: var(--muted);
      margin-top: .6rem;
    }

    .list-check li::before {
      content: "★";
      color: #fbbf24;
      margin-right: .45rem;
      font-size: .78rem;
    }

    /* GIÁ */
    .price-card {
      border-radius: var(--radius-lg);
      border: 1px solid rgba(248,250,252,0.22);
      background: radial-gradient(circle at top, rgba(248,250,252,0.03), transparent 60%), rgba(15,23,42,0.96);
    }

    .price-label {
      font-size: .75rem;
      color: var(--muted);
      text-transform: uppercase;
      letter-spacing: .16em;
      margin-bottom: .1rem;
    }

    .price-value {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: .35rem;
    }

    .price-meta {
      font-size: .76rem;
      color: var(--muted);
      margin-bottom: .6rem;
    }

    .chip {
      display: inline-flex;
      align-items: center;
      gap: .35rem;
      padding: .28rem .65rem;
      border-radius: 999px;
      background: rgba(15,23,42,0.95);
      border: 1px solid rgba(148,163,184,0.6);
      font-size: .76rem;
      color: #e5e7eb;
      margin-right: .3rem;
      margin-bottom: .3rem;
    }

    /* KHU VỰC */
    .chips {
      display: flex;
      flex-wrap: wrap;
      gap: .45rem;
      list-style: none;
      margin-top: .75rem;
    }

    .chips li {
      font-size: .78rem;
      padding: .3rem .65rem;
      border-radius: 999px;
      background: rgba(15,23,42,0.92);
      border: 1px solid rgba(148,163,184,0.45);
    }

    /* QUY TRÌNH */
    .steps {
      list-style: none;
      display: grid;
      gap: .7rem;
      margin-top: .5rem;
      font-size: .86rem;
    }

    .steps li {
      display: grid;
      grid-template-columns: auto 1fr;
      gap: .6rem;
      align-items: flex-start;
    }

    .steps span {
      width: 24px;
      height: 24px;
      border-radius: 999px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: .8rem;
      font-weight: 600;
      background: rgba(248,113,113,0.15);
      border: 1px solid rgba(248,113,113,0.8);
    }

    .steps b {
      display: block;
      font-size: .9rem;
    }

    .steps em {
      font-style: normal;
      color: var(--muted);
      font-size: .82rem;
    }

    /* ĐÁNH GIÁ */
    .reviews {
      display: grid;
      gap: 1rem;
    }

    @media (min-width: 768px) {
      .reviews {
        grid-template-columns: repeat(3,minmax(0,1fr));
      }
    }

    .review {
      font-size: .86rem;
      color: var(--muted);
    }

    .review p {
      margin-bottom: .6rem;
    }

    .review cite {
      font-size: .8rem;
      color: #e5e7eb;
    }

    /* FAQ */
    .faq {
      margin-top: .7rem;
      display: grid;
      gap: .5rem;
    }

    details {
      background: rgba(15,23,42,0.98);
      border-radius: 14px;
      border: 1px solid rgba(148,163,184,0.25);
      padding: .7rem .85rem;
      font-size: .86rem;
      cursor: pointer;
    }

    summary {
      list-style: none;
      color: #e5e7eb;
      font-weight: 500;
    }

    summary::-webkit-details-marker { display: none; }

    details[open] {
      border-color: rgba(248,113,113,0.7);
      box-shadow: 0 18px 40px rgba(0,0,0,0.6);
    }

    details p {
      margin-top: .4rem;
      color: var(--muted);
    }

    /* CONTACT */
    .contact-grid {
      display: grid;
      gap: 1.25rem;
    }

    @media (min-width: 800px) {
      .contact-grid {
        grid-template-columns: minmax(0,1.5fr) minmax(0,1fr);
        align-items: flex-start;
      }
    }

    .form {
      display: grid;
      gap: .7rem;
      margin-top: .7rem;
    }

    .form label {
      font-size: .82rem;
      color: #e5e7eb;
      display: grid;
      gap: .25rem;
    }

    input, textarea {
      background: rgba(15,23,42,0.96);
      border-radius: 11px;
      border: 1px solid rgba(148,163,184,0.5);
      padding: .55rem .6rem;
      color: #f9fafb;
      font-size: .86rem;
      outline: none;
      width: 100%;
      resize: vertical;
    }

    input:focus, textarea:focus {
      border-color: rgba(248,113,113,0.9);
      box-shadow: 0 0 0 1px rgba(248,113,113,0.6);
    }

    .form-actions {
      display: flex;
      flex-wrap: wrap;
      gap: .6rem;
      margin-top: .2rem;
    }

    .panel {
      background: rgba(15,23,42,0.98);
      border-radius: var(--radius-lg);
      border: 1px solid rgba(148,163,184,0.4);
      padding: .9rem .9rem 1rem;
      font-size: .85rem;
      box-shadow: var(--shadow-soft);
    }

    .panel h3 {
      font-size: .98rem;
      margin-bottom: .45rem;
    }

    .panel p + p {
      margin-top: .3rem;
    }

    /* FOOTER & STICKY */
    .site-footer {
      border-top: 1px solid rgba(15,23,42,0.88);
      padding: 1.3rem 0 3.6rem;
      font-size: .8rem;
      color: var(--muted);
    }

    .footer-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem 2rem;
      justify-content: space-between;
      align-items: flex-start;
    }

    .sticky-bar {
      position: fixed;
      left: 0;
      right: 0;
      bottom: 0;
      z-index: 40;
      padding: .55rem .95rem;
      background: linear-gradient(to top, rgba(15,23,42,.98), rgba(15,23,42,.92), transparent);
      display: flex;
      justify-content: center;
    }

    .sticky-inner {
      width: 100%;
      max-width: var(--max-width);
      display: flex;
      gap: .6rem;
      justify-content: space-between;
      align-items: center;
      font-size: .8rem;
    }

    .sticky-inner span {
      color: var(--muted);
      display: none;
    }

    .sticky-actions {
      display: flex;
      flex: 1;
      gap: .6rem;
    }

    .sticky-btn {
      flex: 1;
      padding: .55rem .6rem;
      border-radius: 999px;
      border: 1px solid rgba(148,163,184,0.6);
      text-align: center;
      font-weight: 600;
      font-size: .82rem;
    }

    .sticky-btn.primary {
      background: linear-gradient(120deg,#f97316,#facc15);
      color: #111827;
      border-color: transparent;
    }

    .sticky-btn.secondary {
      background: rgba(15,23,42,0.95);
      color: #e5e7eb;
    }

    @media (min-width: 768px) {
      .sticky-inner span {
        display: inline;
      }
      .sticky-bar {
        padding-bottom: .7rem;
      }
    }

    /* RESPONSIVE NAV */
    @media (max-width: 860px) {
      .main-nav ul {
        position: fixed;
        inset: 56px 12px auto 12px;
        background: rgba(15,23,42,0.98);
        border-radius: 16px;
        border: 1px solid rgba(148,163,184,0.45);
        padding: .7rem;
        flex-direction: column;
        align-items: stretch;
        font-size: .9rem;
        transform-origin: top right;
        transform: scale(.96);
        opacity: 0;
        pointer-events: none;
        transition: opacity .16s ease, transform .16s ease;
      }
      .main-nav ul.open {
        opacity: 1;
        transform: scale(1);
        pointer-events: auto;
      }
      .main-nav li a {
        width: 100%;
        text-align: left;
      }
      .nav-toggle {
        display: inline-flex;
      }
    }

    @media (max-width: 640px) {
      .hero {
        padding-top: .8rem;
      }
      .hero-card {
        order: -1;
      }
      .section-head {
        text-align: left;
      }
      .hero-actions {
        gap: .45rem;
      }
      .btn-lg {
        flex: 1;
        justify-content: center;
      }
    }