/* =========================================================================
   Nguyendow Images — cinematic, editorial, dark.
   Shared stylesheet for all pages.
   ========================================================================= */

@import url('https://fonts.googleapis.com/css2?family=Archivo:wght@400;500;600;700;800;900&family=DM+Mono:wght@400;500&display=swap');

:root {
  /* ---- Ink & surface ---- */
  --bg:        #0B0B0C;
  --bg-1:      #111113;
  --bg-2:      #18181B;
  --bg-3:      #1F1F23;

  --text:      #F4F2EE;
  --text-1:    #C7C5C0;
  --text-2:    #8E8C88;
  --text-3:    #5C5A57;

  --line:      rgba(244,242,238,0.13);
  --line-2:    rgba(244,242,238,0.06);

  /* ---- single muted brass accent ---- */
  --accent:    #C2A37A;
  --accent-1:  #DAC0A0;

  /* ---- type ---- */
  --display:   'Archivo', system-ui, sans-serif;
  --body:      'Archivo', system-ui, sans-serif;
  --mono:      'DM Mono', ui-monospace, monospace;

  /* ---- scale ---- */
  --fs-xs:   12px;
  --fs-sm:   14px;
  --fs-base: 16px;
  --fs-md:   18px;
  --fs-lg:   22px;
  --fs-xl:   28px;
  --fs-2xl:  38px;
  --fs-3xl:  clamp(2.6rem, 6vw, 5rem);
  --fs-hero: clamp(3rem, 9vw, 8.5rem);

  /* ---- spacing ---- */
  --sp-1: 4px;  --sp-2: 8px;  --sp-3: 12px; --sp-4: 16px;
  --sp-5: 24px; --sp-6: 32px; --sp-7: 48px; --sp-8: 64px;
  --sp-9: 96px; --sp-10: 140px;

  --max:     1320px;
  --max-read: 720px;

  --ease:    cubic-bezier(0.22, 1, 0.36, 1);
  --dur:     .5s;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--body);
  font-size: var(--fs-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

::selection { background: var(--accent); color: #0B0B0C; }

/* ---- type primitives ---- */
.eyebrow {
  font-family: var(--mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: var(--sp-3);
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--accent);
  opacity: .7;
}
.eyebrow.no-rule::before { display: none; }

.display {
  font-family: var(--display);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 0.94;
  margin: 0;
  text-wrap: balance;
}

h1, h2, h3 { font-family: var(--display); margin: 0; letter-spacing: -0.02em; }

.section-title {
  font-weight: 800;
  font-size: var(--fs-3xl);
  line-height: 0.98;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

p { margin: 0 0 var(--sp-4); color: var(--text-1); text-wrap: pretty; }
p.lead { font-size: var(--fs-md); color: var(--text-1); line-height: 1.65; }

.muted { color: var(--text-2); }
.accent { color: var(--accent); }

/* ---- layout ---- */
.wrap { width: 100%; max-width: var(--max); margin-inline: auto; padding-inline: var(--sp-6); }
.section { padding-block: var(--sp-10); }
@media (max-width: 720px){ .section { padding-block: var(--sp-9); } }

.divider { height: 1px; background: var(--line-2); border: 0; margin: 0; }

/* =========================================================================
   NAV
   ========================================================================= */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--sp-5) var(--sp-6);
  transition: background var(--dur) var(--ease), padding var(--dur) var(--ease), border-color var(--dur) var(--ease);
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(11,11,12,0.82);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom-color: var(--line-2);
  padding-block: var(--sp-4);
}
.brand {
  font-family: var(--display);
  font-weight: 800;
  font-size: var(--fs-md);
  letter-spacing: -0.01em;
  display: flex; align-items: baseline; gap: .55em;
  line-height: 1;
}
.brand .mark {
  font-family: var(--mono);
  font-weight: 400;
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--accent);
  text-transform: uppercase;
}
.nav-links { display: flex; align-items: center; gap: var(--sp-7); }
.nav-links a {
  font-family: var(--mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-1);
  position: relative;
  padding-block: 4px;
  transition: color var(--dur) var(--ease);
}
.nav-links a::after {
  content:""; position:absolute; left:0; bottom:-2px; height:1px; width:0;
  background: var(--accent); transition: width .35s var(--ease);
}
.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after, .nav-links a[aria-current="page"]::after { width: 100%; }
.nav-links a[aria-current="page"] { color: var(--text); }

.nav-cta {
  font-family: var(--mono) !important;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 10px 18px !important;
  color: var(--text) !important;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), color var(--dur) var(--ease);
}
.nav-cta::after { display: none !important; }
.nav-cta:hover { background: var(--accent); border-color: var(--accent); color: #0B0B0C !important; }

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { display:block; width: 26px; height: 2px; background: var(--text); margin: 5px 0; transition: transform .3s var(--ease), opacity .3s var(--ease); }

@media (max-width: 880px){
  .nav-toggle { display: block; z-index: 120; }
  .nav-links {
    position: fixed; inset: 0; flex-direction: column;
    justify-content: center; gap: var(--sp-6);
    background: rgba(11,11,12,0.97);
    backdrop-filter: blur(8px);
    transform: translateY(-100%);
    transition: transform var(--dur) var(--ease);
    z-index: 110;
  }
  .nav-links.open { transform: translateY(0); }
  .nav-links a { font-size: var(--fs-md); letter-spacing: 0.12em; }
  body.menu-open .nav-toggle span:nth-child(1){ transform: translateY(7px) rotate(45deg); }
  body.menu-open .nav-toggle span:nth-child(2){ opacity: 0; }
  body.menu-open .nav-toggle span:nth-child(3){ transform: translateY(-7px) rotate(-45deg); }
}

/* =========================================================================
   BUTTONS
   ========================================================================= */
.btn {
  display: inline-flex; align-items: center; gap: var(--sp-3);
  font-family: var(--mono); font-size: var(--fs-xs);
  letter-spacing: 0.18em; text-transform: uppercase;
  padding: 16px 28px; border-radius: 999px;
  border: 1px solid var(--text); background: var(--text); color: #0B0B0C;
  cursor: pointer; transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.btn:hover { background: var(--accent); border-color: var(--accent); color: #0B0B0C; }
.btn .arr { transition: transform .35s var(--ease); }
.btn:hover .arr { transform: translateX(5px); }

.btn.ghost { background: transparent; color: var(--text); border-color: var(--line); }
.btn.ghost:hover { background: transparent; color: var(--accent); border-color: var(--accent); }

/* =========================================================================
   FOOTER
   ========================================================================= */
.footer { background: var(--bg-1); border-top: 1px solid var(--line-2); padding-block: var(--sp-9) var(--sp-6); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: var(--sp-7); }
.footer-grid .display { font-size: var(--fs-2xl); margin-bottom: var(--sp-4); }
.footer h4 { font-family: var(--mono); font-weight: 500; font-size: var(--fs-xs); letter-spacing: 0.24em; text-transform: uppercase; color: var(--text-2); margin: 0 0 var(--sp-4); }
.footer-links { display: flex; flex-direction: column; gap: var(--sp-3); }
.footer-links a { color: var(--text-1); font-size: var(--fs-sm); transition: color .3s var(--ease); width: fit-content; }
.footer-links a:hover { color: var(--accent); }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; gap: var(--sp-4); margin-top: var(--sp-9); padding-top: var(--sp-5); border-top: 1px solid var(--line-2); }
.footer-bottom span { font-family: var(--mono); font-size: var(--fs-xs); letter-spacing: 0.1em; color: var(--text-3); }
@media (max-width: 720px){ .footer-grid { grid-template-columns: 1fr; gap: var(--sp-6); } .footer-bottom { flex-direction: column; align-items: flex-start; } }

/* =========================================================================
   REVEAL ON SCROLL
   ========================================================================= */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .9s var(--ease), transform .9s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce){
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* =========================================================================
   IMAGE FRAME (cinematic)
   ========================================================================= */
.frame { position: relative; overflow: hidden; background: var(--bg-2); }
.frame img { width: 100%; height: 100%; object-fit: cover; transition: transform 1.1s var(--ease), filter 1.1s var(--ease); }
.frame::after { content:""; position:absolute; inset:0; box-shadow: inset 0 0 120px rgba(0,0,0,0.45); pointer-events:none; }
a.frame:hover img, .frame.zoom:hover img { transform: scale(1.045); }