/* ============================================================
   vominhhuy.com — global tokens + base + shared components
   Be Vietnam Pro (sans) + IBM Plex Mono (technical labels)
   ============================================================ */

:root {
  --font-sans: 'Be Vietnam Pro', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;

  /* charcoal / near-black */
  --bg:      #0a0b0d;
  --bg-1:    #101216;
  --bg-2:    #16191e;
  --bg-3:    #1d2128;
  --line:    rgba(255,255,255,0.09);
  --line-2:  rgba(255,255,255,0.05);

  --text:    #eef0f3;
  --muted:   #9aa1ab;
  --faint:   #636a74;

  /* lime — data / automation / technical accent */
  --acc:      #c2f24d;
  --acc-dim:  rgba(194,242,77,0.12);
  --acc-line: rgba(194,242,77,0.32);

  /* ember — energy / action accent (mệnh Hỏa) */
  --fire:     #ff6a3d;
  --fire-2:   #ffb13d;
  --fire-dim: rgba(255,106,61,0.14);
  --fire-line:rgba(255,106,61,0.34);
  --fire-grad: linear-gradient(120deg, #ffb13d, #ff6a3d);
  --fire-ink: #1c0e05;

  --header-h: 64px;
}

* { box-sizing: border-box; }

html { -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
::selection { background: rgba(255,255,255,0.18); }

.mono { font-family: var(--font-mono); }

/* monospace eyebrow/label */
.eyebrow, .sec-eye {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--acc);
}

/* striped image placeholder */
.ph {
  position: relative;
  background-color: var(--bg-2);
  background-image: repeating-linear-gradient(-45deg, rgba(255,255,255,0.035) 0 1px, transparent 1px 11px);
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.ph::after {
  content: attr(data-label);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--faint);
  text-align: center;
  padding: 0 12px;
  text-transform: uppercase;
}
.ph img { position:absolute; inset:0; width:100%; height:100%; object-fit:cover; z-index:1; }

/* layout */
.container { width: min(1180px, 100% - 48px); margin-inline: auto; }
.sr, .screen-reader-text { position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0 0 0 0); white-space:nowrap; }

/* faint global grid */
.gridbg {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image: linear-gradient(var(--line-2) 1px, transparent 1px), linear-gradient(90deg, var(--line-2) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(120% 90% at 50% 0%, #000 35%, transparent 78%);
  -webkit-mask-image: radial-gradient(120% 90% at 50% 0%, #000 35%, transparent 78%);
}
.site-main { position: relative; z-index: 1; }

/* buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  font-size: 15px; font-weight: 600; padding: 14px 22px; border-radius: 9px;
  min-height: 44px; cursor: pointer; border: 0;
  transition: transform .15s, box-shadow .15s, background .15s, border-color .15s;
}
.btn-pri { background: var(--fire-grad); color: var(--fire-ink); }
.btn-pri:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(255,106,61,.32); }
.btn-ghost { border: 1px solid var(--line); color: var(--text); background: transparent; }
.btn-ghost:hover { border-color: var(--acc-line); background: var(--acc-dim); }

/* section frame */
section.blk { padding: 90px 0; position: relative; }
.sec-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 46px; flex-wrap: wrap; }
.sec-title { font-size: clamp(28px,3.6vw,42px); font-weight: 700; letter-spacing: -.02em; margin: 12px 0 0; max-width: 18ch; }
.sec-desc { color: var(--muted); max-width: 40ch; font-size: 15px; line-height: 1.6; }

/* reveal on scroll */
.rv { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.rv.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
  .rv { opacity: 1; transform: none; }
}

/* admin bar offset */
body.admin-bar .site-header { top: 32px; }
@media (max-width:782px){ body.admin-bar .site-header { top: 46px; } }