/* ===== Derek Grundy — landing styles ===== */
/* Đổi màu thương hiệu tại :root */
:root{
  --bg:#0b0d12;
  --bg-soft:#13171f;
  --bg-card:#141922;
  --ink:#eef1f5;
  --muted:#9aa4b2;
  --muted-2:#6b7480;
  --accent:#d4a24e;        /* gold accent — đổi theo ý */
  --accent-hi:#e9c178;     /* gold sáng cho gradient */
  --accent-2:#6ea8fe;
  --border:#222934;
  --border-hi:#2e3845;
  --radius:18px;
  --max:1100px;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Inter',-apple-system,Segoe UI,Roboto,Arial,sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
  overflow-anchor:none;
}
/* ánh sáng nền dịu */
body::before{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(60% 50% at 78% -5%, rgba(212,162,78,.14), transparent 60%),
    radial-gradient(50% 40% at 0% 18%, rgba(110,168,254,.07), transparent 55%);
}
a{color:inherit;text-decoration:none}
::selection{background:var(--accent);color:#0a0a0a}
section{padding:96px 24px}
.section{max-width:var(--max);margin:0 auto}
h1,h2,h3{font-family:'Fraunces',Georgia,serif;font-weight:600;line-height:1.08;letter-spacing:-.01em}
h2{font-size:clamp(1.7rem,3.6vw,2.55rem);margin-bottom:14px}
h3{font-size:1.22rem;margin-bottom:8px}
.section-kicker{display:block;color:var(--accent);font-family:'Inter',sans-serif;font-weight:600;letter-spacing:.16em;text-transform:uppercase;font-size:.72rem;margin-bottom:34px}

/* nav */
.nav{
  position:sticky;top:0;z-index:20;
  display:flex;justify-content:space-between;align-items:center;
  padding:18px 24px;max-width:var(--max);margin:0 auto;
}
/* nền nav xuất hiện khi cuộn (thêm/xóa class .scrolled bằng JS) */
.nav::before{
  content:"";position:absolute;inset:0;z-index:-1;
  background:rgba(11,13,18,.72);backdrop-filter:blur(12px) saturate(140%);
  border-bottom:1px solid transparent;
  opacity:0;transition:opacity .3s var(--ease),border-color .3s var(--ease);
}
.nav.scrolled::before{opacity:1;border-bottom-color:var(--border)}
.brand{font-family:'Fraunces',serif;font-weight:600;font-size:1.18rem;letter-spacing:-.01em}
.nav-links a{color:var(--muted);margin-left:26px;font-size:.92rem;font-weight:500;transition:color .2s;position:relative}
.nav-links a:hover{color:var(--ink)}
.nav-links a::after{content:"";position:absolute;left:0;bottom:-5px;width:0;height:1.5px;background:var(--accent);transition:width .25s var(--ease)}
.nav-links a:hover::after{width:100%}

/* hamburger (chỉ hiện trên mobile) */
.nav-toggle{display:none;flex-direction:column;justify-content:center;gap:5px;
  width:44px;height:44px;padding:0 11px;border:1px solid var(--border-hi);border-radius:11px;
  background:rgba(20,25,34,.55);cursor:pointer}
.nav-toggle span{display:block;height:2px;width:100%;background:var(--ink);border-radius:2px;
  transition:transform .25s var(--ease),opacity .2s var(--ease)}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* hero */
.hero{
  max-width:var(--max);margin:0 auto;
  display:grid;grid-template-columns:1.25fr .75fr;gap:56px;align-items:center;
  padding-top:72px;padding-bottom:112px;min-height:88vh;
}
.eyebrow{color:var(--accent);font-weight:600;letter-spacing:.16em;text-transform:uppercase;font-size:.76rem;margin-bottom:20px;display:flex;align-items:center;gap:10px}
.eyebrow::before{content:"";width:28px;height:1.5px;background:var(--accent);display:inline-block}
.hero h1{font-size:clamp(2.6rem,6.4vw,4.4rem);margin-bottom:22px;letter-spacing:-.02em}
.accent{
  background:linear-gradient(120deg,var(--accent-hi),var(--accent));
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.lead{color:var(--muted);font-size:clamp(1.05rem,1.6vw,1.18rem);max-width:50ch;margin-bottom:34px}
.cta-row{display:flex;gap:14px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:13px 28px;border-radius:100px;font-weight:600;font-size:.95rem;
  transition:transform .18s var(--ease),box-shadow .25s var(--ease),background .2s,border-color .2s;
}
.btn:hover{transform:translateY(-2px)}
.btn-primary{
  background:linear-gradient(120deg,var(--accent-hi),var(--accent));color:#160f02;
  box-shadow:0 8px 24px -8px rgba(212,162,78,.6);
}
.btn-primary:hover{box-shadow:0 14px 32px -8px rgba(212,162,78,.7)}
.btn-ghost{border:1px solid var(--border-hi);color:var(--ink)}
.btn-ghost:hover{border-color:var(--accent);background:rgba(212,162,78,.06)}

.hero-photo{
  position:relative;aspect-ratio:4/5;border-radius:calc(var(--radius) + 4px);
  overflow:hidden;background:var(--bg-soft);
  border:1px solid var(--border-hi);
  box-shadow:0 30px 60px -30px rgba(0,0,0,.8);
}
.hero-photo::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 55%,rgba(11,13,18,.5));pointer-events:none}
.hero-photo img{width:100%;height:100%;object-fit:cover}
.photo-fallback{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-family:'Fraunces',serif;font-size:5rem;font-weight:600;color:var(--accent);opacity:.35;letter-spacing:.05em}

/* about */
.about-grid{display:grid;grid-template-columns:1.5fr 1fr;gap:56px;align-items:start}
.about-grid p{color:var(--muted);font-size:1.08rem}
.facts{list-style:none;display:grid;gap:0}
.facts li{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--border);padding:15px 0;font-size:.98rem}
.facts li:first-child{padding-top:0}
.facts strong{color:var(--ink);font-weight:600}
.facts span{color:var(--muted)}

/* cards */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px}
.card{
  position:relative;background:var(--bg-card);
  border:1px solid var(--border);border-radius:var(--radius);padding:28px;
  transition:border-color .25s var(--ease),transform .2s var(--ease),box-shadow .25s var(--ease);
  overflow:hidden;
}
.card::before{
  content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;
  background:linear-gradient(135deg,rgba(212,162,78,.5),transparent 40%);
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;
  opacity:0;transition:opacity .25s var(--ease);
}
.card:hover{transform:translateY(-4px);box-shadow:0 20px 40px -24px rgba(0,0,0,.7)}
.card:hover::before{opacity:1}
.card-logo{
  width:58px;height:58px;border-radius:14px;margin-bottom:18px;
  display:flex;align-items:center;justify-content:center;overflow:hidden;
  background:#fff;border:1px solid var(--border);
  box-shadow:0 6px 16px -10px rgba(0,0,0,.6);flex:0 0 auto;
}
.card-logo img{width:100%;height:100%;object-fit:contain;padding:7px}
.card-logo-dark{background:#11161f;padding:0}
.card-logo-dark img{padding:0}
.card-logo-mono{
  background:linear-gradient(135deg,var(--accent-hi),var(--accent));
  color:#160f02;font-family:'Fraunces',serif;font-weight:600;font-size:1.3rem;letter-spacing:.02em;
}
.card p{color:var(--muted);font-size:.97rem;margin-bottom:16px}
.link{color:var(--accent);font-weight:600;font-size:.92rem;transition:gap .2s;display:inline-flex;gap:4px}
.link:hover{gap:9px}

/* leadership philosophy */
.lead-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start;margin-top:8px}
.framework-art{
  position:sticky;top:96px;
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:14px;box-shadow:0 24px 50px -28px rgba(0,0,0,.8);
}
.framework-art img{width:100%;height:auto;aspect-ratio:1/1;display:block;border-radius:8px}
.principles{list-style:none;counter-reset:none;display:grid;gap:2px}
.principles li{
  display:flex;align-items:flex-start;gap:16px;
  padding:13px 0;border-bottom:1px solid var(--border);
}
.principles li:last-child{border-bottom:0}
.pl{
  flex:0 0 auto;width:34px;height:34px;border-radius:9px;
  display:flex;align-items:center;justify-content:center;
  font-family:'Fraunces',serif;font-weight:600;font-size:1.05rem;
  color:var(--accent);background:rgba(212,162,78,.1);border:1px solid rgba(212,162,78,.28);
}
.principles div{display:flex;flex-direction:column;line-height:1.4;padding-top:3px}
.principles strong{color:var(--ink);font-weight:600;font-size:1rem}
.principles div{color:var(--muted);font-size:.9rem}

.book-callout{
  margin-top:48px;display:flex;align-items:center;justify-content:space-between;gap:28px;
  background:var(--bg-soft);border:1px solid var(--border);border-radius:var(--radius);
  padding:30px 32px;position:relative;overflow:hidden;
}
.book-callout::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:linear-gradient(var(--accent-hi),var(--accent))}
.book-title{font-size:1.5rem;margin-bottom:8px}
.book-callout p{color:var(--muted);font-size:1rem;max-width:54ch}
.book-callout .btn{flex:0 0 auto}
@media(max-width:760px){
  .lead-grid{grid-template-columns:1fr;gap:28px}
  .framework-art{position:static;max-width:460px;margin:0 auto}
  .book-callout{flex-direction:column;align-items:flex-start;gap:18px}
}

/* in the field — gallery */
.section-lead{color:var(--muted);font-size:1.06rem;max-width:60ch;margin:-4px 0 34px}
.gallery{
  display:grid;grid-template-columns:repeat(3,1fr);gap:18px;
}
.shot{
  position:relative;border-radius:var(--radius);overflow:hidden;
  border:1px solid var(--border);background:var(--bg-soft);
  aspect-ratio:4/3;
}
.shot-wide{grid-column:1 / -1;aspect-ratio:16/7}
.shot img{
  width:100%;height:100%;object-fit:cover;display:block;
  transition:transform .6s var(--ease);
}
.shot:hover img{transform:scale(1.04)}
.shot figcaption{
  position:absolute;left:0;right:0;bottom:0;
  padding:34px 18px 16px;font-size:.92rem;color:#f3f5f8;
  background:linear-gradient(transparent,rgba(7,9,13,.88));
}
@media(max-width:600px){
  .gallery{grid-template-columns:1fr}
  .shot-wide{aspect-ratio:4/3}
}

/* watch — youtube embeds */
.videos{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:8px}
.video-embed{
  position:relative;aspect-ratio:16/9;border-radius:var(--radius);overflow:hidden;
  border:1px solid var(--border);background:#000;
  box-shadow:0 20px 44px -26px rgba(0,0,0,.8);
}
.video-embed iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.lite{position:absolute;inset:0;width:100%;height:100%;padding:0;border:0;background:#000;cursor:pointer;display:block}
.lite img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.92;transition:opacity .2s var(--ease),transform .5s var(--ease)}
.lite:hover img{opacity:1;transform:scale(1.03)}
.video-play{
  position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  width:68px;height:68px;border-radius:50%;
  background:rgba(10,12,16,.55);border:1px solid rgba(255,255,255,.28);
  display:flex;align-items:center;justify-content:center;
  transition:transform .2s var(--ease),background .2s var(--ease);
}
.lite:hover .video-play{transform:translate(-50%,-50%) scale(1.08);background:var(--accent)}
.video-play::before{content:"";border-style:solid;border-width:11px 0 11px 18px;border-color:transparent transparent transparent #fff;margin-left:5px}
.video figcaption{padding:14px 2px 0;display:flex;flex-direction:column;gap:3px}
.video figcaption strong{color:var(--ink);font-weight:600;font-size:1rem;line-height:1.35}
.video figcaption span{color:var(--muted);font-size:.86rem}
@media(max-width:780px){ .videos{grid-template-columns:1fr;gap:20px;max-width:460px;margin-left:auto;margin-right:auto} }

/* contact */
.contact{text-align:center;border-top:1px solid var(--border);margin-top:24px}
.contact .lead{margin:0 auto 28px}
.contact .cta-row{justify-content:center}

/* footer */
.footer{border-top:1px solid var(--border);text-align:center;padding:32px 24px;color:var(--muted-2);font-size:.88rem}

/* scroll reveal */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}

/* responsive */
@media(max-width:820px){
  .hero{grid-template-columns:1fr;gap:36px;min-height:auto;padding-top:48px;padding-bottom:80px}
  .hero-photo{max-width:300px;margin:0 auto}
  .about-grid{grid-template-columns:1fr;gap:32px}
  section{padding:68px 20px}
}

/* mobile nav — hamburger + dropdown */
@media(max-width:760px){
  .nav-toggle{display:flex}
  .nav-links{
    position:absolute;top:calc(100% + 6px);left:16px;right:16px;
    flex-direction:column;align-items:stretch;gap:2px;padding:8px;
    background:rgba(13,16,22,.97);backdrop-filter:blur(14px) saturate(140%);
    border:1px solid var(--border);border-radius:16px;
    box-shadow:0 26px 50px -20px rgba(0,0,0,.85);
    opacity:0;visibility:hidden;transform:translateY(-8px);
    transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s;
  }
  .nav-links.open{opacity:1;visibility:visible;transform:none}
  .nav-links a{
    margin:0;padding:14px 16px;font-size:1.05rem;color:var(--ink);border-radius:11px;
  }
  .nav-links a:active{background:rgba(212,162,78,.12)}
  .nav-links a::after{display:none}
}

@media(max-width:520px){
  .cta-row .btn{flex:1;justify-content:center}
}