/* ============================================================
   Theme: Signal  —  dark grid / monospace brutalist
   ============================================================ */

:root {
  --bg:       #0a0a0a;
  --panel:    #111111;
  --panel-2:  #171717;
  --line:     #2c2c2c;
  --text:     #ededed;
  --muted:    #8b8b8b;
  --accent:   #c8f751;
  --grid:     68px;
  --radius:   0px;
  --max:      1120px;
  --mono:     "JetBrains Mono", "Cascadia Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --sans:     "Inter", "Segoe UI", system-ui, -apple-system, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    linear-gradient(rgba(255, 255, 255, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .035) 1px, transparent 1px);
  background-size: var(--grid) var(--grid);
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.shell {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 22px 64px;
}

/* ---------- top bar ---------- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  padding: 18px 0;
  margin-bottom: 54px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-family: var(--mono);
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--text);
}
.brand:hover { color: var(--text); text-decoration: none; }

.brand .mark {
  width: 26px;
  height: 12px;
  background:
    repeating-linear-gradient(90deg, var(--accent) 0 3px, transparent 3px 6px);
}

.legal-nav { display: flex; gap: 4px; flex-wrap: wrap; }

.legal-nav a {
  padding: 7px 13px;
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--muted);
  border: 1px solid transparent;
}
.legal-nav a:hover { color: var(--text); border-color: var(--line); text-decoration: none; }
.legal-nav a.active { color: var(--bg); background: var(--accent); border-color: var(--accent); }

/* ---------- hero ---------- */

.hero { padding: 8px 0 52px; max-width: 780px; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 26px;
  padding: 6px 12px;
  border: 1px solid var(--accent);
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--accent);
}

.dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  animation: flash 1.1s steps(2, end) infinite;
}

@keyframes flash { 50% { opacity: 0; } }

.hero h1 {
  margin: 0 0 22px;
  font-family: var(--mono);
  font-size: clamp(1.9rem, 5.6vw, 3.3rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -.03em;
  text-transform: uppercase;
  color: var(--text);
}

.hero h1::after {
  content: "";
  display: block;
  width: 74px;
  height: 8px;
  margin-top: 20px;
  background: var(--accent);
}

.tagline {
  margin: 0 0 16px;
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--accent);
}

.intro { margin: 0; max-width: 620px; color: var(--muted); }

/* ---------- cards ---------- */

.card {
  padding: 30px;
  margin-top: 0;
  margin-bottom: 22px;
  border: 1px solid var(--line);
  background: var(--panel);
  position: relative;
}

.card::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 54px;
  height: 3px;
  background: var(--accent);
}

.card h2 {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 1.06rem;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.muted { margin: 0 0 24px; color: var(--muted); font-size: .93rem; }

/* ---------- form ---------- */

.field { margin-bottom: 16px; }

.field label {
  display: block;
  margin-bottom: 7px;
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}

.field input,
.field textarea {
  width: 100%;
  padding: 13px 14px;
  font: inherit;
  color: var(--text);
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 0;
  outline: none;
  transition: border-color .16s, background .16s;
}

.field textarea { resize: vertical; min-height: 124px; }

.field input:focus,
.field textarea:focus {
  border-color: var(--accent);
  background: #1c1c1c;
}

.hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }

.btn {
  display: inline-block;
  padding: 13px 26px;
  font-family: var(--mono);
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  border: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  transition: background .16s, color .16s, border-color .16s;
}

.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--bg); }
.btn.primary:hover { background: #dcff7a; }
.btn.primary:disabled { opacity: .5; cursor: progress; }
.btn.ghost:hover { border-color: var(--accent); color: var(--accent); }

.status { min-height: 20px; margin: 14px 0 0; font-family: var(--mono); font-size: .82rem; color: var(--muted); }
.status.ok  { color: var(--accent); }
.status.err { color: #ff7b7b; }

/* ---------- developer ---------- */

.dev {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1px;
  margin: 18px 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.dev > div { padding: 14px 16px; background: var(--panel-2); }

.dev dt {
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}
.dev dd { margin: 6px 0 0; font-weight: 600; word-break: break-word; }

/* ---------- legal pages ---------- */

.legal { padding: 0; max-width: 820px; }

.crumbs {
  display: flex;
  gap: 9px;
  align-items: center;
  margin: 0 0 18px;
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
}
.crumbs span { opacity: .5; }

.legal h1 {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: clamp(1.6rem, 4.6vw, 2.5rem);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -.02em;
  text-transform: uppercase;
}

.updated {
  margin: 0 0 32px;
  padding: 10px 14px;
  border-left: 3px solid var(--accent);
  background: var(--panel);
  font-family: var(--mono);
  font-size: .78rem;
  color: var(--muted);
}

.legal article {
  padding: 30px;
  border: 1px solid var(--line);
  background: var(--panel);
}

.legal article .sec { border-top: 1px solid var(--line); }
.legal article .sec:first-child { border-top: 0; }

.legal article .sec > h2,
.legal article .sec > summary {
  display: flex;
  gap: 12px;
  align-items: baseline;
  margin: 30px 0 10px;
  font-family: var(--mono);
  font-size: .98rem;
  font-weight: 700;
  letter-spacing: .03em;
  text-transform: uppercase;
  list-style: none;
}
.legal article .sec:first-child > :is(h2, summary) { margin-top: 0; }

.legal article summary { cursor: pointer; user-select: none; -webkit-user-select: none; transition: color .16s; }
.legal article summary::-webkit-details-marker { display: none; }
.legal article summary::marker { content: ""; }
.legal article summary:hover { color: var(--accent); }
.legal article summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }

.legal article summary::after {
  content: "[+]";
  margin-left: auto;
  padding-left: 16px;
  font-size: .82rem;
  line-height: 1;
  color: var(--accent);
}
.legal article details[open] > summary::after { content: "[\2212]"; }

.legal article .sec > h2 .num,
.legal article .sec > summary .num {
  font-size: .82rem;
  color: var(--accent);
}

.legal article .sec-body { padding-bottom: 2px; }

.legal article p { margin: 0 0 14px; color: #cfcfcf; }

.legal-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 24px;
}

/* ---------- footer ---------- */

.footer {
  margin-top: 46px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: .76rem;
  letter-spacing: .06em;
  color: var(--muted);
}
.footer nav { display: flex; gap: 18px; flex-wrap: wrap; }
.footer p { margin: 0; }

/* ---------- responsive ---------- */

@media (max-width: 640px) {
  .shell { padding: 0 16px 48px; }
  .topbar { margin-bottom: 36px; }
  .card, .legal article { padding: 22px 18px; }
  .hero { padding: 0 0 36px; }
  .footer { flex-direction: column; align-items: flex-start; }
}

/* ---------- generated palette for nguyenthihuyen.info ---------- */

:root {
  --accent:   #f745b0;
  --accent-2: #42f088;
  --grid:     64px;
}