/* =====================================================================
   VFC LEGACY — Trang Giới Thiệu (landing)
   Bám cấu trúc thuyết phục của trang Mentor, khoác bản sắc Legacy:
   dark-luxury · xanh rêu thẫm · vàng kim · Lora display.
   Kế thừa token + font từ styles.css (--lead/--gold/--cream/--ink/--t1..t5).
   ===================================================================== */

/* ---- nền giấy tối có hạt sáng, tạo chiều sâu ---- */
.lz {
  position: relative;
  overflow-x: clip;
}
.lz::before {
  content: "";
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(circle at 78% -8%, rgba(224,147,76,.16), transparent 46%),
    radial-gradient(circle at 8% 14%, rgba(126,90,162,.10), transparent 40%),
    radial-gradient(circle at 50% 118%, rgba(224,147,76,.08), transparent 50%);
}

/* ============================ NAV ============================ */
.lz-nav {
  position: sticky; top: 0; z-index: 60;
  display: flex; align-items: center; justify-content: space-between;
  height: 66px; padding: 0 clamp(16px, 4vw, 38px);
  background: rgba(20,29,24,.72);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.lz-nav .brand { display: flex; align-items: center; gap: 12px; }
.lz-nav .brand img { height: 34px; width: auto; }
.lz-nav .brand b { font-family: var(--font-serif); font-size: 1.32rem; letter-spacing: 2px; color: var(--lead); line-height: 1; }
.lz-nav .brand small { display: block; font-size: .6rem; letter-spacing: 3px; text-transform: uppercase; color: var(--gold); margin-top: 4px; }
.lz-nav .acts { display: flex; align-items: center; gap: 10px; }

.lbtn {
  font: inherit; font-weight: 600; cursor: pointer; text-decoration: none;
  display: inline-flex; align-items: center; gap: 7px;
  padding: 11px 22px; border-radius: 999px; border: 1px solid transparent;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
  white-space: nowrap; font-size: .95rem;
}
.lbtn.gold { background: linear-gradient(135deg, var(--lead), var(--gold)); color: #1a130a; box-shadow: 0 12px 30px -10px rgba(224,147,76,.55); }
.lbtn.gold:hover { transform: translateY(-2px); box-shadow: 0 18px 38px -10px rgba(224,147,76,.7); }
.lbtn.ghost { background: transparent; border-color: var(--line); color: var(--ink); }
.lbtn.ghost:hover { border-color: var(--gold); color: var(--gold); transform: translateY(-2px); }
.lbtn .big { font-size: 1.04rem; }

/* ============================ HERO ============================ */
.lz-hero { padding: clamp(46px, 7vw, 96px) clamp(16px, 4vw, 38px) clamp(30px, 5vw, 60px); }
.lz-hero-in {
  max-width: 1140px; margin: 0 auto;
  display: grid; grid-template-columns: 1.15fr .85fr; gap: clamp(28px, 5vw, 64px);
  align-items: center;
}
.lz-eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: .76rem; letter-spacing: 3.5px; text-transform: uppercase;
  color: var(--gold); font-weight: 600; margin-bottom: 22px;
}
.lz-eyebrow::before { content: ""; width: 26px; height: 1px; background: var(--gold); opacity: .7; }
.lz-hero h1 {
  font-size: clamp(3.4rem, 1.4rem + 9vw, 8rem); line-height: .9; letter-spacing: 3px;
  color: var(--lead); text-shadow: 0 4px 50px rgba(224,147,76,.28); margin: 0;
}
.lz-hero h1 i { font-style: italic; color: var(--gold); display: block; font-size: .42em; letter-spacing: 1px; margin-top: 10px; text-shadow: none; }
.lz-hero .lede {
  font-size: clamp(1.02rem, .95rem + .4vw, 1.2rem); color: var(--ink);
  max-width: 46ch; margin: 24px 0 4px; line-height: 1.75;
}
.lz-hero .lede b { color: var(--gold-soft); font-weight: 600; }
.lz-hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }

/* khung ảnh founder — viền vàng + vầng sáng */
.lz-portrait { position: relative; justify-self: center; }
.lz-portrait img {
  width: min(360px, 80vw); aspect-ratio: 3/4; object-fit: cover; object-position: 50% 6%;
  border-radius: 200px 200px 26px 26px;
  border: 1px solid var(--line);
  box-shadow: 0 40px 90px -30px rgba(0,0,0,.7), inset 0 0 0 1px rgba(224,147,76,.12);
}
.lz-portrait::after {
  content: ""; position: absolute; inset: -14px;
  border-radius: 218px 218px 38px 38px;
  border: 1px solid rgba(224,147,76,.25); pointer-events: none;
}
.lz-portrait .seal {
  position: absolute; bottom: 18px; left: -18px;
  background: linear-gradient(135deg, var(--lead), var(--gold)); color: #1a130a;
  font-family: var(--font-serif); font-weight: 700; font-size: .82rem; line-height: 1.2;
  padding: 11px 16px; border-radius: 14px; box-shadow: 0 16px 30px -12px rgba(0,0,0,.6);
  max-width: 180px;
}
.lz-portrait .seal small { display: block; font-family: var(--font-body); font-weight: 600; font-size: .64rem; letter-spacing: 1px; text-transform: uppercase; opacity: .8; margin-top: 2px; }

/* ============================ SECTIONS chung ============================ */
.lz-sec { max-width: 1080px; margin: 0 auto; padding: clamp(48px, 7vw, 92px) clamp(16px, 4vw, 38px); }
.lz-sec.tight { padding-top: clamp(20px, 3vw, 36px); }
.lz-head { text-align: center; max-width: 680px; margin: 0 auto clamp(34px, 4vw, 54px); }
.lz-head .kick { font-size: .76rem; letter-spacing: 3.5px; text-transform: uppercase; color: var(--gold); font-weight: 600; }
.lz-head h2 { font-size: clamp(1.9rem, 1.3rem + 2.2vw, 3rem); color: var(--lead); margin: 12px 0 0; line-height: 1.1; }
.lz-head p { color: var(--muted); margin: 14px auto 0; font-size: 1.04rem; }

/* băng trích dẫn */
.lz-quote { text-align: center; padding: clamp(40px, 6vw, 70px) clamp(16px, 4vw, 38px) 0; }
.lz-quote p {
  font-family: var(--font-serif); font-style: italic; color: var(--dark);
  font-size: clamp(1.25rem, 1rem + 1.3vw, 2rem); line-height: 1.5;
  max-width: 24ch; margin: 0 auto;
}
.lz-quote .by { margin-top: 18px; font-size: .78rem; letter-spacing: 3px; text-transform: uppercase; color: var(--gold); font-weight: 600; }
.lz-quote .rule { width: 70px; height: 2px; margin: 26px auto 0; background: linear-gradient(90deg, var(--lead), var(--gold)); border-radius: 2px; }

/* ---- NỖI ĐAU ---- */
.lz-pain {
  background: linear-gradient(135deg, #1E3038, #15252F);
  border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: clamp(28px, 4vw, 52px); position: relative; overflow: hidden;
}
.lz-pain::before { content: "?"; position: absolute; top: -34px; right: 18px; font-family: var(--font-serif); font-size: 13rem; color: rgba(224,147,76,.07); line-height: 1; }
.lz-pain h2 { font-size: clamp(1.5rem, 1.1rem + 1.6vw, 2.3rem); color: var(--gold); max-width: 22ch; line-height: 1.22; }
.lz-pain p { color: var(--ink); max-width: 64ch; margin: 16px 0 0; }
.lz-pain p + p { margin-top: 12px; }
.lz-pain b { color: var(--gold-soft); }

/* ---- 3 GIÁ TRỊ ---- */
.lz-vals { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.lz-val {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--r);
  padding: 28px 24px; transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
  position: relative;
}
.lz-val:hover { transform: translateY(-4px); border-color: var(--gold); }
.lz-val .vi { font-size: 1.5rem; color: var(--gold); }
.lz-val h3 { font-size: 1.22rem; color: var(--dark); margin: 12px 0 8px; }
.lz-val p { color: var(--muted); font-size: .98rem; margin: 0; }

/* ---- 5 TẦNG ---- */
.lz-tangs { display: grid; gap: 14px; }
.lz-tang {
  --c: var(--gold);
  display: grid; grid-template-columns: 64px 1fr auto; align-items: center; gap: 20px;
  background: var(--white); border: 1px solid var(--line);
  border-left: 4px solid var(--c); border-radius: var(--r);
  padding: 22px 26px; transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.lz-tang:hover { transform: translateX(5px); box-shadow: -8px 16px 36px rgba(0,0,0,.3); }
.lz-tang .no {
  width: 64px; height: 64px; border-radius: 16px; flex: none;
  display: grid; place-items: center; font-family: var(--font-serif); font-weight: 700; font-size: 1.9rem;
  color: var(--c); background: color-mix(in srgb, var(--c) 13%, var(--white));
  border: 1px solid color-mix(in srgb, var(--c) 38%, transparent);
}
.lz-tang .kick { font-size: .68rem; letter-spacing: 2px; text-transform: uppercase; color: var(--c); font-weight: 700; }
.lz-tang h3 { font-size: clamp(1.2rem, 1rem + .7vw, 1.6rem); color: var(--dark); line-height: 1.15; margin: 3px 0 5px; }
.lz-tang p { font-size: .96rem; color: var(--muted); font-style: italic; margin: 0; }
.lz-tang .cnt { text-align: center; flex: none; }
.lz-tang .cnt b { display: block; font-family: var(--font-serif); font-size: 1.9rem; color: var(--c); line-height: 1; }
.lz-tang .cnt small { font-size: .68rem; letter-spacing: 1px; text-transform: uppercase; color: var(--muted); }

/* ---- CÔNG THỨC KHÁC BIỆT ---- */
.lz-formula {
  display: flex; flex-wrap: wrap; align-items: stretch; justify-content: center; gap: 12px;
  margin: 0 auto clamp(14px, 2vw, 22px); max-width: 920px;
}
.lz-fm {
  flex: 1 1 180px; background: var(--white); border: 1px solid var(--line); border-radius: 14px;
  padding: 18px 16px; text-align: center; min-width: 150px;
}
.lz-fm b { display: block; color: var(--dark); font-family: var(--font-serif); font-size: 1.05rem; }
.lz-fm small { display: block; color: var(--muted); font-size: .78rem; margin-top: 4px; }
.lz-fm.res { background: linear-gradient(135deg, var(--lead), var(--gold)); border-color: transparent; }
.lz-fm.res b { color: #1a130a; letter-spacing: 1px; }
.lz-fm.res small { color: rgba(26,19,10,.78); }
.lz-op { display: grid; place-items: center; font-family: var(--font-serif); font-size: 1.6rem; color: var(--gold); flex: none; }
.lz-fmtag { text-align: center; color: var(--muted); font-size: .9rem; margin-top: 4px; }

/* ---- LƯỚI KHÁC BIỆT ---- */
.lz-diff { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: clamp(28px, 4vw, 44px); }
.lz-card {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--r);
  padding: 26px 24px; transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.lz-card:hover { transform: translateY(-4px); border-color: var(--gold); }
.lz-card .ic { font-size: 1.6rem; }
.lz-card h3 { font-size: 1.14rem; color: var(--dark); margin: 12px 0 8px; line-height: 1.3; }
.lz-card p { color: var(--muted); font-size: .96rem; margin: 0; }
.lz-card.feature { grid-column: span 3; background: linear-gradient(135deg, #1E303800, #1A2C36); border-left: 4px solid var(--gold); }
.lz-card.feature .steps { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 18px; }
.lz-card.feature .step { flex: 1 1 200px; background: rgba(224,147,76,.06); border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; }
.lz-card.feature .step .lb { font-family: var(--font-serif); font-weight: 700; color: var(--gold); font-size: 1.05rem; }
.lz-card.feature .step p { color: var(--ink); font-size: .92rem; margin-top: 6px; }
.lz-card.feature .arrow { display: grid; place-items: center; color: var(--gold); font-size: 1.3rem; flex: 0 0 18px; }

/* ---- 47 CHỦ ĐỀ (preview cột theo tầng) ---- */
.lz-topics { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; }
.lz-tcol { background: var(--white); border: 1px solid var(--line); border-top: 3px solid var(--c, var(--gold)); border-radius: var(--r); padding: 20px 20px 8px; }
.lz-tcol .h { font-family: var(--font-serif); font-weight: 700; color: var(--c, var(--gold)); font-size: 1rem; line-height: 1.25; margin-bottom: 12px; }
.lz-tcol ul { list-style: none; margin: 0; padding: 0; }
.lz-tcol li { font-size: .9rem; color: var(--ink); padding: 7px 0 7px 18px; position: relative; border-bottom: 1px dashed var(--line); }
.lz-tcol li:last-child { border-bottom: none; }
.lz-tcol li::before { content: "◆"; position: absolute; left: 0; color: var(--c, var(--gold)); font-size: .6rem; top: 11px; }
.lz-tcol .more { font-size: .82rem; color: var(--muted); padding: 9px 0; font-style: italic; }

/* ---- ĐẶC QUYỀN ---- */
.lz-perks {
  background: linear-gradient(135deg, #1E3038, #15252F); border: 1px solid var(--line);
  border-radius: var(--r-lg); padding: clamp(28px, 4vw, 50px); position: relative; overflow: hidden;
}
.lz-perks::before { content: "✦"; position: absolute; top: 14px; right: 26px; font-size: 8rem; color: rgba(224,147,76,.06); line-height: 1; }
.lz-perks h2 { color: var(--gold); font-size: clamp(1.5rem, 1.2rem + 1.4vw, 2.2rem); }
.lz-perks .pl { color: var(--ink); max-width: 60ch; margin: 12px 0 26px; }
.lz-perkgrid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; }
.lz-perk { background: rgba(224,147,76,.06); border: 1px solid var(--line); border-radius: 14px; padding: 20px 22px; }
.lz-perk .ic { font-size: 1.4rem; }
.lz-perk b { display: block; color: var(--gold-soft); font-family: var(--font-serif); font-size: 1.1rem; margin: 8px 0 5px; }
.lz-perk span { font-size: .92rem; color: rgba(231,225,211,.82); }

/* ---- FOUNDER ---- */
.lz-founder { display: grid; grid-template-columns: .8fr 1.2fr; gap: clamp(24px, 4vw, 48px); align-items: center;
  background: var(--white); border: 1px solid var(--line); border-radius: var(--r-lg); padding: clamp(26px, 4vw, 46px); }
.lz-founder .photo img { width: 100%; max-width: 320px; aspect-ratio: 3/4; object-fit: cover; object-position: 50% 6%; border-radius: 18px; border: 1px solid var(--line); }
.lz-founder .kick { font-size: .74rem; letter-spacing: 3px; text-transform: uppercase; color: var(--gold); font-weight: 600; }
.lz-founder .nm { font-family: var(--font-serif); font-size: 2rem; color: var(--lead); font-weight: 700; margin: 6px 0 2px; }
.lz-founder .role { color: var(--muted); font-size: .92rem; }
.lz-founder ul { list-style: none; margin: 18px 0 0; padding: 0; }
.lz-founder li { position: relative; padding: 6px 0 6px 24px; color: var(--ink); font-size: .96rem; }
.lz-founder li::before { content: "✦"; position: absolute; left: 0; color: var(--gold); }
.lz-founder li b { color: var(--gold-soft); }
.lz-founder blockquote { font-family: var(--font-serif); font-style: italic; color: var(--dark); font-size: 1.12rem; line-height: 1.55;
  margin: 20px 0 0; padding-left: 18px; border-left: 3px solid var(--gold); }
.lz-founder .sign { display: flex; align-items: center; gap: 12px; margin-top: 18px; }
.lz-founder .sign img { height: 54px; filter: brightness(0) invert(80%) sepia(38%) saturate(620%) hue-rotate(2deg) brightness(95%); }
.lz-founder .sign .n { font-family: var(--font-serif); color: var(--lead); font-weight: 700; }

/* ---- FAQ ---- */
.lz-faq { max-width: 760px; margin: 0 auto; }
.lz-q { background: var(--white); border: 1px solid var(--line); border-radius: var(--r); margin-bottom: 12px; overflow: hidden; }
.lz-q summary { cursor: pointer; list-style: none; padding: 18px 22px; font-weight: 600; color: var(--dark); font-size: 1.04rem;
  display: flex; align-items: center; justify-content: space-between; gap: 14px; }
.lz-q summary::-webkit-details-marker { display: none; }
.lz-q summary::after { content: "+"; color: var(--gold); font-size: 1.5rem; font-weight: 400; flex: none; transition: transform var(--dur) var(--ease); }
.lz-q[open] summary::after { transform: rotate(45deg); }
.lz-q .a { padding: 0 22px 20px; color: var(--muted); font-size: .98rem; line-height: 1.7; }
.lz-q .a b { color: var(--gold-soft); }

/* ---- CTA cuối ---- */
.lz-cta { text-align: center; max-width: 760px; margin: 0 auto; padding: clamp(48px, 7vw, 90px) clamp(16px, 4vw, 38px);
  position: relative; }
.lz-cta h2 { font-size: clamp(2rem, 1.4rem + 2.4vw, 3.2rem); color: var(--lead); }
.lz-cta p { color: var(--ink); margin: 16px auto 0; max-width: 50ch; }
.lz-cta .lz-hero-cta { justify-content: center; margin-top: 30px; }

/* ---- FOOTER ---- */
.lz-foot { text-align: center; padding: clamp(40px, 6vw, 70px) clamp(16px, 4vw, 38px); border-top: 1px solid var(--line); }
.lz-foot .vision { max-width: 660px; margin: 0 auto 22px; }
.lz-foot .vision h3 { color: var(--lead); font-size: clamp(1.4rem, 1.2rem + 1vw, 2rem); margin-bottom: 12px; }
.lz-foot .vision p { color: var(--ink); }
.lz-foot .org { font-size: .76rem; letter-spacing: 3px; text-transform: uppercase; color: var(--gold); font-weight: 600; margin-top: 18px; }
.lz-foot .org small { display: block; color: var(--muted); letter-spacing: 1px; margin-top: 6px; text-transform: none; font-weight: 400; }

/* ---- reveal on scroll (progressive: chỉ ẩn khi JS sẵn sàng) ---- */
.js .reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.js .reveal.in { opacity: 1; transform: none; }

/* ============================ RESPONSIVE ============================ */
@media (max-width: 880px) {
  .lz-hero-in { grid-template-columns: 1fr; text-align: center; }
  .lz-eyebrow { justify-content: center; }
  .lz-hero .lede { margin-inline: auto; }
  .lz-hero-cta { justify-content: center; }
  .lz-portrait { order: -1; }
  .lz-vals, .lz-diff { grid-template-columns: 1fr; }
  .lz-card.feature, .lz-card.feature .steps { grid-column: auto; }
  .lz-founder { grid-template-columns: 1fr; text-align: center; }
  .lz-founder .photo img { margin: 0 auto; }
  .lz-founder ul { text-align: left; }
  .lz-founder blockquote { text-align: left; }
  .lz-founder .sign { justify-content: center; }
}
@media (max-width: 560px) {
  .lz-tang { grid-template-columns: 52px 1fr; }
  .lz-tang .cnt { display: none; }
  .lz-tang .no { width: 52px; height: 52px; font-size: 1.5rem; }
  .lz-nav .brand small { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}