/* Self-hosted display face — Space Grotesk, SIL OFL 1.1 (see ./font-OFL.txt). Vietnamese + latin subsets. */
@font-face{font-family:"Space Grotesk";font-style:normal;font-weight:300 700;font-display:swap;src:url("./font-space-grotesk-vietnamese.woff2") format("woff2");unicode-range:U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB;}
@font-face{font-family:"Space Grotesk";font-style:normal;font-weight:300 700;font-display:swap;src:url("./font-space-grotesk-latin.woff2") format("woff2");unicode-range:U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;}

/* ============================================================
   Điện Quang concept — scoped under [data-site="dienquang"]
   Direction 2026-2030: Photonic Grid
   Fingerprint: laser rail topnav · filament-glow-frame ·
   photon-outline-kinetic · lighting-cell-board · beam-sweep-breaks ·
   real-lighting-photography · filament-coil-grid · electric-pulse
   ============================================================ */

[data-site="dienquang"] {
  --dq-ink: #0b0e14;
  --dq-surface: #121722;
  --dq-surface-up: #1a2130;
  --dq-text: #e8f0fa;
  --dq-muted: #8c9bb0;
  --dq-cyan: #3be8ff;
  --dq-cyan-deep: #0fb4cc;
  --dq-amber: #ffb53c;
  --dq-amber-deep: #c77e12;
  --dq-grid: #1e2736;
  --dq-border: #273246;
  --dq-container: 76rem;
  --dq-t-fast: 120ms;
  --dq-t-base: 200ms;

  font-family: "Space Grotesk", system-ui, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background:
    linear-gradient(var(--dq-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--dq-grid) 1px, transparent 1px),
    var(--dq-ink);
  background-size: 44px 44px, 44px 44px, auto;
  color: var(--dq-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  margin: 0;
}

[data-site="dienquang"] *,
[data-site="dienquang"] *::before,
[data-site="dienquang"] *::after { box-sizing: border-box; }

[data-site="dienquang"] h1,
[data-site="dienquang"] h2,
[data-site="dienquang"] h3 {
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 0.6em;
}

[data-site="dienquang"] p { margin: 0 0 1em; }
[data-site="dienquang"] ul, [data-site="dienquang"] ol { margin: 0; padding: 0; list-style: none; }
[data-site="dienquang"] a { color: var(--dq-cyan); }
[data-site="dienquang"] svg { max-width: 100%; }

[data-site="dienquang"] :focus-visible {
  outline: 3px solid var(--dq-cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

[data-site="dienquang"] .visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

[data-site="dienquang"] .skip {
  position: absolute;
  left: 1rem; top: -4rem;
  background: var(--dq-cyan);
  color: #06121a;
  font-weight: 800;
  padding: 0.7rem 1.2rem;
  z-index: 100;
  text-decoration: none;
  transition: top var(--dq-t-fast) ease;
}
[data-site="dienquang"] .skip:focus { top: 1rem; }

[data-site="dienquang"] .container {
  width: min(100% - 2.5rem, var(--dq-container));
  margin-inline: auto;
}

/* ---------- concept strip ---------- */
[data-site="dienquang"] .concept-strip {
  background: #060810;
  color: #93a6bd;
  font-size: 0.8rem;
  padding: 0.55rem 1rem;
  text-align: center;
}
[data-site="dienquang"] .concept-tag {
  display: inline-block;
  background: var(--dq-amber);
  color: #241703;
  font-weight: 800;
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  padding: 0.12rem 0.6rem;
  margin-right: 0.5rem;
  vertical-align: 1px;
}

/* ---------- header ---------- */
[data-site="dienquang"] .site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 14, 20, 0.94);
  backdrop-filter: blur(10px);
}
[data-site="dienquang"] .header-inner {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  padding: 0.65rem 0;
}
[data-site="dienquang"] .laser-rail {
  height: 2px;
  background: linear-gradient(90deg, var(--dq-amber), var(--dq-cyan) 45%, transparent 90%);
  box-shadow: 0 0 12px rgba(59, 232, 255, 0.55);
}
[data-site="dienquang"] .brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--dq-text);
}
[data-site="dienquang"] .brand-glyph {
  display: grid;
  place-items: center;
  width: 42px; height: 42px;
  background: var(--dq-surface-up);
  border: 1px solid var(--dq-border);
  border-radius: 12px;
  color: var(--dq-cyan);
}
[data-site="dienquang"] .brand-text { display: flex; flex-direction: column; line-height: 1.15; }
[data-site="dienquang"] .brand-name { font-size: 1.1rem; font-weight: 900; letter-spacing: 0.08em; }
[data-site="dienquang"] .brand-sub {
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--dq-amber);
  text-transform: uppercase;
}
[data-site="dienquang"] .main-nav { margin-left: auto; }
[data-site="dienquang"] .main-nav ul { display: flex; gap: 0.15rem; flex-wrap: wrap; }
[data-site="dienquang"] .main-nav a {
  display: block;
  text-decoration: none;
  color: var(--dq-text);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.55rem 0.9rem;
  border-radius: 8px;
  transition: background var(--dq-t-fast) ease, color var(--dq-t-fast) ease;
}
[data-site="dienquang"] .main-nav a:hover { background: var(--dq-cyan); color: #06121a; }
[data-site="dienquang"] .header-cta {
  text-decoration: none;
  font-weight: 800;
  font-size: 0.85rem;
  color: #241703;
  background: var(--dq-amber);
  padding: 0.6rem 1.05rem;
  border-radius: 999px;
  white-space: nowrap;
  box-shadow: 0 0 18px rgba(255, 181, 60, 0.35);
  transition: background var(--dq-t-fast) ease;
}
[data-site="dienquang"] .header-cta:hover { background: #ffc766; }

[data-site="dienquang"] .nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  padding: 0.5rem;
  cursor: pointer;
  margin-left: auto;
}
[data-site="dienquang"] .nav-toggle span {
  width: 24px; height: 3px;
  background: var(--dq-cyan);
}

/* ---------- hero ---------- */
[data-site="dienquang"] .hero { padding: 4.25rem 0 0; }
[data-site="dienquang"] .hero-grid {
  display: grid;
  grid-template-columns: 1.06fr 0.94fr;
  gap: 3rem;
  align-items: center;
}
[data-site="dienquang"] .eyebrow {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  color: var(--dq-cyan);
  font-weight: 800;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 0 0 1.1rem;
}
[data-site="dienquang"] .eyebrow-soft { color: var(--dq-amber); }
[data-site="dienquang"] .chip {
  background: var(--dq-surface-up);
  color: var(--dq-cyan);
  border: 1px solid var(--dq-border);
  padding: 0.18rem 0.7rem;
  font-size: 0.76rem;
  letter-spacing: 0.08em;
}
[data-site="dienquang"] .photon-type {
  font-size: clamp(2.2rem, 5vw, 3.9rem);
  margin-bottom: 0.35em;
  color: var(--dq-text);
}
[data-site="dienquang"] .photon-type em {
  font-style: normal;
  color: transparent;
  -webkit-text-stroke: 2px var(--dq-amber);
  text-shadow: 0 0 26px rgba(255, 181, 60, 0.3);
}
[data-site="dienquang"] .lede { color: var(--dq-muted); max-width: 40rem; }
[data-site="dienquang"] .hero-actions { display: flex; gap: 0.8rem; flex-wrap: wrap; margin-top: 1.6rem; }

[data-site="dienquang"] .btn {
  display: inline-block;
  text-decoration: none;
  font-weight: 800;
  padding: 0.85rem 1.55rem;
  border: 2px solid transparent;
  transition: transform var(--dq-t-fast) ease, box-shadow var(--dq-t-fast) ease, border-color var(--dq-t-fast) ease;
}
[data-site="dienquang"] .btn-photon {
  background: var(--dq-cyan);
  color: #06121a;
  box-shadow: 0 0 24px rgba(59, 232, 255, 0.4);
}
[data-site="dienquang"] .btn-photon:hover { transform: translateY(-2px); box-shadow: 0 0 34px rgba(59, 232, 255, 0.6); }
[data-site="dienquang"] .btn-outline { color: var(--dq-text); border-color: var(--dq-border); }
[data-site="dienquang"] .btn-outline:hover { border-color: var(--dq-amber); color: var(--dq-amber); }
[data-site="dienquang"] .btn-lg { padding: 1rem 1.9rem; font-size: 1rem; }

[data-site="dienquang"] .hero-filament { margin: 0; }
[data-site="dienquang"] .filament-frame {
  position: relative;
  border: 1px solid var(--dq-border);
  border-radius: 22px;
  overflow: hidden;
  background: #060810;
}
[data-site="dienquang"] .filament-frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.03);
}
[data-site="dienquang"] .filament-glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at 52% 46%, rgba(255, 181, 60, 0.34), transparent 58%);
  mix-blend-mode: screen;
  animation: dq-breathe 6s ease-in-out infinite alternate;
}
@keyframes dq-breathe {
  from { opacity: 0.7; }
  to { opacity: 1; }
}
[data-site="dienquang"] .hero-filament figcaption {
  margin-top: 0.7rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.72rem;
  color: var(--dq-muted);
}
[data-site="dienquang"] .hero-filament a,
[data-site="dienquang"] .cell-credit a { color: inherit; text-decoration: underline; text-underline-offset: 2px; }

/* ticker */
[data-site="dienquang"] .ticker {
  margin-top: 3rem;
  border-block: 1px solid var(--dq-border);
  background: #060810;
  overflow: hidden;
}
[data-site="dienquang"] .ticker-track {
  display: flex;
  gap: 2.5rem;
  padding: 0.75rem 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--dq-cyan);
  white-space: nowrap;
  animation: dq-marquee 30s linear infinite;
}
[data-site="dienquang"] .ticker-track span:nth-child(even) { color: var(--dq-amber); }
[data-site="dienquang"] .ticker-track span::after { content: " ⟡ "; color: var(--dq-border); margin-left: 2.5rem; }
@keyframes dq-marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ---------- sections ---------- */
[data-site="dienquang"] .section { padding: 4.25rem 0; }
[data-site="dienquang"] .section-head { max-width: 44rem; margin-bottom: 2.25rem; }
[data-site="dienquang"] .section-head h2 { font-size: clamp(1.8rem, 3.4vw, 2.5rem); }
[data-site="dienquang"] .section-note { color: var(--dq-muted); }

/* photon bento */
[data-site="dienquang"] .cell-board {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  align-items: start;
  gap: 1rem;
}
[data-site="dienquang"] .cell {
  position: relative;
  grid-column: span 2;
  background: var(--dq-surface);
  border: 1px solid var(--dq-border);
  border-radius: 14px;
  padding: 1.6rem 1.5rem 1.5rem;
  overflow: hidden;
  transition: transform var(--dq-t-fast) ease, border-color var(--dq-t-fast) ease;
}
[data-site="dienquang"] .cell:hover { transform: translateY(-4px); border-color: var(--dq-cyan); }
[data-site="dienquang"] .cell-text { grid-column: span 3; }
[data-site="dienquang"] .cell-spectrum {
  display: block;
  height: 6px;
  width: 64px;
  border-radius: 999px;
  background: var(--dq-cyan);
  box-shadow: 0 0 14px rgba(59, 232, 255, 0.65);
  margin-bottom: 1rem;
}
[data-site="dienquang"] .spectrum-cyan { background: var(--dq-cyan); box-shadow: 0 0 14px rgba(59, 232, 255, 0.65); }
[data-site="dienquang"] .spectrum-amber { background: var(--dq-amber); box-shadow: 0 0 14px rgba(255, 181, 60, 0.6); }
[data-site="dienquang"] .cell h3 { font-size: 1.18rem; margin-bottom: 0.25em; }
[data-site="dienquang"] .cell p { margin: 0; color: var(--dq-muted); font-size: 0.92rem; }
[data-site="dienquang"] .cell-photo {
  display: block;
  width: 100%;
  height: clamp(150px, 19vw, 200px);
  object-fit: cover;
  border-radius: 10px;
  border: 1px solid var(--dq-border);
  margin-bottom: 1rem;
}
[data-site="dienquang"] .cell-credit {
  display: block;
  margin-top: 0.7rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.68rem;
  color: var(--dq-muted);
}

/* metrics */
[data-site="dienquang"] .metrics { padding: 2.75rem 0; }
[data-site="dienquang"] .metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}
[data-site="dienquang"] .metric {
  background: var(--dq-surface);
  border: 1px solid var(--dq-border);
  border-top: 3px solid var(--dq-cyan);
  border-radius: 14px;
  padding: 1.5rem 1.35rem;
}
[data-site="dienquang"] .metric-amber { border-top-color: var(--dq-amber); }
[data-site="dienquang"] .metric-value {
  display: block;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--dq-cyan);
  line-height: 1;
  margin-bottom: 0.4rem;
}
[data-site="dienquang"] .metric-amber .metric-value { color: var(--dq-amber); }
[data-site="dienquang"] .metric-label { font-size: 0.86rem; color: var(--dq-muted); }

/* beam line history */
[data-site="dienquang"] .beam-line { position: relative; display: grid; gap: 1.4rem; }
[data-site="dienquang"] .beam-line::before {
  content: "";
  position: absolute;
  left: 11px; top: 8px; bottom: 8px;
  width: 2px;
  background: linear-gradient(var(--dq-amber), var(--dq-cyan));
  box-shadow: 0 0 10px rgba(59, 232, 255, 0.5);
}
[data-site="dienquang"] .beam-stop {
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: 1.15rem;
  align-items: start;
}
[data-site="dienquang"] .stop-dot {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--dq-ink);
  border: 3px solid var(--dq-cyan);
  box-shadow: 0 0 12px rgba(59, 232, 255, 0.7);
  margin-top: 0.5rem;
}
[data-site="dienquang"] .beam-stop:first-child .stop-dot { border-color: var(--dq-amber); box-shadow: 0 0 12px rgba(255, 181, 60, 0.7); }
[data-site="dienquang"] .h-year {
  display: block;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--dq-amber);
  line-height: 1.1;
}
[data-site="dienquang"] .beam-stop p { margin: 0.35em 0 0; color: var(--dq-muted); max-width: 46rem; }

[data-site="dienquang"] .fact-card {
  background: var(--dq-surface);
  border: 1px solid var(--dq-border);
  padding: 1.5rem 1.6rem;
  display: grid;
  gap: 0.9rem;
  margin: 2rem 0 0;
  max-width: 46rem;
  border-radius: 14px;
}
[data-site="dienquang"] .fact-card div {
  display: grid;
  grid-template-columns: 8.5rem 1fr;
  gap: 0.75rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px dashed var(--dq-border);
}
[data-site="dienquang"] .fact-card div:last-child { border-bottom: 0; padding-bottom: 0; }
[data-site="dienquang"] .fact-card a { color: var(--dq-amber); text-decoration: underline; text-underline-offset: 2px; }
[data-site="dienquang"] .fact-card dt {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dq-muted);
}
[data-site="dienquang"] .fact-card dd { margin: 0; font-weight: 600; font-size: 0.95rem; }

/* cta */
[data-site="dienquang"] .cta { padding: 4.25rem 0; text-align: center; }
[data-site="dienquang"] .cta-inner h2 { font-size: clamp(1.8rem, 3.4vw, 2.5rem); }

/* footer */
[data-site="dienquang"] .site-footer {
  background: #060810;
  color: #93a6bd;
  padding: 3.25rem 0 2rem;
  border-top: 1px solid var(--dq-border);
}
[data-site="dienquang"] .footer-brand { display: flex; align-items: baseline; gap: 0.9rem; margin-bottom: 1.4rem; flex-wrap: wrap; }
[data-site="dienquang"] .f-name { color: var(--dq-text); font-size: 1.25rem; font-weight: 900; letter-spacing: 0.08em; }
[data-site="dienquang"] .f-sub { font-size: 0.8rem; color: var(--dq-amber); }
[data-site="dienquang"] .footer-nav ul { display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; margin-bottom: 1.6rem; }
[data-site="dienquang"] .footer-nav a { color: var(--dq-text); text-decoration: none; font-size: 0.9rem; font-weight: 600; }
[data-site="dienquang"] .footer-nav a:hover { color: var(--dq-cyan); }
[data-site="dienquang"] .disclaimer {
  border-top: 1px solid var(--dq-border);
  padding-top: 1.4rem;
  font-size: 0.82rem;
  color: #7d90a7;
  max-width: 60rem;
}
[data-site="dienquang"] .colophon { font-size: 0.75rem; color: #8fa2b8; }

/* ---------- responsive ---------- */
@media (max-width: 1020px) {
  [data-site="dienquang"] .hero-grid { grid-template-columns: 1fr; }
  [data-site="dienquang"] .metrics-grid { grid-template-columns: repeat(2, 1fr); }
  [data-site="dienquang"] .cell { grid-column: span 3; }
}

@media (max-width: 760px) {
  [data-site="dienquang"] .nav-toggle { display: flex; }
  [data-site="dienquang"] .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: var(--dq-ink);
    border-bottom: 1px solid var(--dq-border);
    padding: 0.75rem 1.25rem 1.25rem;
  }
  [data-site="dienquang"] .main-nav.is-open { display: block; }
  [data-site="dienquang"] .main-nav ul { flex-direction: column; gap: 0.25rem; }
  [data-site="dienquang"] .header-cta { display: inline-flex; padding: 0.5rem 0.85rem; font-size: 0.82rem; }
  [data-site="dienquang"] .cta-long { display: none; }
  [data-site="dienquang"] .cell { grid-column: span 6; }
}

@media (max-width: 520px) {
  [data-site="dienquang"] .metrics-grid { grid-template-columns: 1fr; }
  [data-site="dienquang"] .section { padding: 3rem 0; }
  [data-site="dienquang"] .fact-card div { grid-template-columns: 1fr; }
}

/* ---------- scroll-driven beams (2026+ CSS) ---------- */
@supports (animation-timeline: view()) {
  @media (prefers-reduced-motion: no-preference) {
    [data-site="dienquang"] .cell {
      animation: dq-cell-rise linear both;
      animation-timeline: view();
      animation-range: entry 0% cover 34%;
    }
    @keyframes dq-cell-rise {
      from { transform: translateY(26px); }
      to { transform: translateY(0); }
    }
  }
}

/* ---------- motion ---------- */
@media (prefers-reduced-motion: reduce) {
  [data-site="dienquang"] * {
    animation: none !important;
    transition: none !important;
  }
}

/* ---------- polish: motion layer 2 ---------- */
[data-site="dienquang"] .cell-spectrum {
  animation: dq-spectrum 3.2s ease-in-out infinite alternate;
}
[data-site="dienquang"] .cell:nth-child(odd) .cell-spectrum { animation-delay: 1.2s; }
@keyframes dq-spectrum {
  50% { filter: brightness(1.5); }
}
[data-site="dienquang"] .stop-dot {
  animation: dq-blink 2.8s ease-in-out infinite;
}
[data-site="dienquang"] .beam-stop:nth-child(2) .stop-dot { animation-delay: 0.9s; }
[data-site="dienquang"] .beam-stop:nth-child(3) .stop-dot { animation-delay: 1.8s; }
@keyframes dq-blink {
  50% { box-shadow: 0 0 20px rgba(59, 232, 255, 0.9); }
}
[data-site="dienquang"] .cell:hover .cell-spectrum {
  animation-duration: 1.2s;
}