/* ==========================================================================
   Trang giới thiệu (F04) — CSS riêng.
   Tách từ `reference-design/landing.html`. Token vẫn lấy từ tokens.css.
   ========================================================================== */
/* ---- Hero ------------------------------------------------------------ */
  .hero { position: relative; background: var(--ink); color: var(--on-ink); overflow: hidden; }
  .hero__media { position: absolute; inset: 0; }
  .hero__media img { width: 100%; height: 100%; object-fit: cover; opacity: .42; }
  .hero__media::after {
    content: ""; position: absolute; inset: 0;
    background: linear-gradient(to top, var(--ink) 6%, color-mix(in oklab, var(--ink) 62%, transparent) 55%, color-mix(in oklab, var(--ink) 42%, transparent));
  }
  .hero__in { position: relative; padding-block: clamp(var(--s7), 9vw, 128px); }
  .hero__grid { display: grid; gap: var(--s6); grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr); align-items: end; }
  @media (max-width: 900px) { .hero__grid { grid-template-columns: 1fr; align-items: start; } }
  .hero .eyebrow { color: var(--on-ink-muted); }
  .hero__title { color: var(--on-ink); }
  .hero__sub {
    font-family: var(--font-display); font-style: italic; font-weight: 500;
    font-size: clamp(1.375rem, 1rem + 1.5vw, 2.125rem); line-height: 1.15;
    letter-spacing: -0.01em; color: var(--on-ink-muted); margin-top: 10px;
  }
  .hero__sub::before {
    content: ""; display: block; width: 44px; height: 2px;
    background: color-mix(in oklab, var(--on-ink) 42%, transparent); margin-bottom: 14px;
  }
  .hero__facts { display: grid; gap: var(--s3); margin-top: var(--s5); }
  .hero__fact { display: flex; gap: var(--s3); align-items: baseline; font-size: var(--t-small); }
  .hero__fact dt { flex: none; width: 92px; color: var(--on-ink-muted); font-size: var(--t-caption); letter-spacing: 0.08em; text-transform: uppercase; }
  .hero .pending-copy { color: var(--on-ink-muted); border-bottom-color: color-mix(in oklab, var(--on-ink) 30%, transparent); }
  .hero__cta { display: flex; flex-wrap: wrap; gap: var(--s3); margin-top: var(--s6); }
  .hero .btn--ghost { color: var(--on-ink); border-color: var(--ink-border); }
  .hero .btn--ghost:hover { background: color-mix(in oklab, var(--on-ink) 10%, transparent); }

  .ticker {
    border: 1px solid var(--ink-border); border-radius: var(--r-lg);
    background: color-mix(in oklab, var(--ink) 72%, transparent);
    backdrop-filter: blur(6px); padding: var(--s5);
  }
  .ticker__row { display: flex; justify-content: space-between; align-items: baseline; gap: var(--s4); padding-block: 10px; }
  .ticker__row + .ticker__row { border-top: 1px solid var(--ink-border); }
  .ticker__k { font-size: var(--t-caption); letter-spacing: 0.08em; text-transform: uppercase; color: var(--on-ink-muted); }
  .ticker__v { font-family: var(--font-display); font-size: 1.5rem; letter-spacing: -0.01em; }
  .bar { height: 6px; border-radius: 3px; background: color-mix(in oklab, var(--on-ink) 16%, transparent); overflow: hidden; margin-top: var(--s3); }
  .bar > i { display: block; height: 100%; background: color-mix(in oklab, var(--tier-1) 58%, var(--on-ink)); }

  /* ---- Bảng giá -------------------------------------------------------- */
  .prices { display: grid; gap: var(--s4); grid-template-columns: repeat(3, 1fr); }
  @media (max-width: 780px) { .prices { grid-template-columns: 1fr; } }
  .price {
    position: relative; padding: var(--s5); background: var(--surface);
    border: 1px solid var(--border); border-radius: var(--r-lg);
    display: flex; flex-direction: column; gap: var(--s2);
  }
  .price__band { height: 5px; border-radius: 3px; width: 56px; }
  .price__amt { font-family: var(--font-display); font-size: 2.25rem; letter-spacing: -0.02em; line-height: 1; margin-top: var(--s2); }
  .price__amt small { font-family: var(--font-body); font-size: .9rem; letter-spacing: 0; color: var(--muted); }
  .price__where { font-size: var(--t-small); color: var(--muted); line-height: 1.5; }
  .price__meta { margin-top: auto; padding-top: var(--s4); border-top: 1px solid var(--border); display: flex; justify-content: space-between; font-size: var(--t-caption); color: var(--muted); }

  /* ---- Quy trình ------------------------------------------------------- */
  .steps { display: grid; gap: var(--s5); grid-template-columns: repeat(4, 1fr); counter-reset: st; }
  @media (max-width: 900px) { .steps { grid-template-columns: repeat(2, 1fr); } }
  @media (max-width: 540px) { .steps { grid-template-columns: 1fr; } }
  .step { padding-top: var(--s4); border-top: 2px solid var(--fg); }
  .step:nth-child(n+2) { border-top-color: var(--border-strong); }
  .step__n { font-family: var(--font-mono); font-size: var(--t-caption); letter-spacing: 0.1em; color: var(--accent); }
  .step h3 { margin-top: 6px; }
  .step p { font-size: var(--t-small); color: var(--muted); margin-top: 6px; line-height: 1.55; }

  /* ---- Khối giới thiệu + ảnh ------------------------------------------- */
  .about { display: grid; gap: var(--s6); grid-template-columns: minmax(0, 1fr) minmax(0, .82fr); align-items: start; }
  @media (max-width: 900px) { .about { grid-template-columns: 1fr; } }
  .figure { position: relative; border-radius: var(--r-lg); overflow: hidden; border: 1px solid var(--border); }
  .figure img { width: 100%; aspect-ratio: 3 / 2; object-fit: cover; }
  .figure__cap {
    position: absolute; left: var(--s3); bottom: var(--s3); max-width: calc(100% - 2 * var(--s3));
    background: color-mix(in oklab, var(--ink) 88%, transparent); color: var(--on-ink);
    border-radius: var(--r-md); padding: 8px 12px; font-size: var(--t-caption);
    letter-spacing: 0.02em; box-shadow: var(--shadow-2);
  }
  .quote {
    font-family: var(--font-display); font-style: italic; font-size: clamp(1.35rem, 1rem + 1.5vw, 2rem);
    line-height: 1.35; letter-spacing: -0.01em; max-width: 22ch;
  }

  /* ---- Liên hệ ---------------------------------------------------------- */
  .contacts { display: grid; gap: var(--s4); grid-template-columns: repeat(4, 1fr); }
  @media (max-width: 940px) { .contacts { grid-template-columns: repeat(2, 1fr); } }
  @media (max-width: 520px) { .contacts { grid-template-columns: 1fr; } }
  .contact { padding: var(--s5) var(--s4); background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg); }
  .contact__role { font-size: var(--t-caption); font-weight: 550; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
  .contact h3 { margin-top: 8px; font-size: 1.125rem; }
  .contact__link {
    display: inline-block; margin-top: 10px; font-size: var(--t-small); font-weight: 500;
    letter-spacing: 0.01em; text-decoration: none; border-bottom: 1px solid var(--border-strong);
    padding-bottom: 2px; word-break: break-word;
  }
  .contact__link:hover { border-bottom-color: var(--fg); }

  /* ---- Dải kết ---------------------------------------------------------- */
  .closer { background: var(--ink); color: var(--on-ink); }
  .closer__in { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--s5); padding-block: var(--s7); }
  .closer h2 { color: var(--on-ink); max-width: 18ch; }