/* ==========================================================================
   05-gioi-thieu GIỚI THIỆU
   Tách từ index.html: <style> dòng 384–459 (giữ nguyên 100% nội dung).
   Section intro: tiêu đề, dòng mô tả, chữ vàng nhấn mạnh.
   ========================================================================== */
/* ============ INTRO ============ */
.intro {
  position: relative; z-index: 10;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 140px 40px;
  background: var(--bg);
  text-align: center;
}
.intro-inner { max-width: 920px; width: 100%; }

.intro-eyebrow {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  letter-spacing: 3.5px;
  text-transform: uppercase;
  color: var(--gold);
  font-weight: 600;
  margin-bottom: 32px;
  opacity: 0; transform: translateY(12px);
  transition: opacity 0.9s ease, transform 0.9s ease;
}
.intro.visible .intro-eyebrow { opacity: 1; transform: translateY(0); }

.intro-logo {
  display: block;
  max-width: 340px;
  width: 100%;
  margin: 0 auto 8px;
  border-radius: 12px;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.55);
  opacity: 0; transform: translateY(16px);
  transition: opacity 0.9s ease 0.3s, transform 0.9s ease 0.3s;
}
.intro.visible .intro-logo { opacity: 1; transform: translateY(0); }

.intro-divider {
  width: 44px;
  height: 1px;
  background: var(--gold);
  margin: 44px auto;
  opacity: 0;
  transition: opacity 1s ease 0.4s;
}
.intro.visible .intro-divider { opacity: 1; }

.intro-desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-2);
  max-width: 620px;
  margin: 0 auto;
  letter-spacing: -0.005em;
  opacity: 0; transform: translateY(12px);
  transition: opacity 0.9s ease 0.5s, transform 0.9s ease 0.5s;
}
.intro.visible .intro-desc { opacity: 1; transform: translateY(0); }
.intro-desc span { color: var(--gold); font-weight: 600; }