/* ============================================================
   Theme: Aurora  —  deep glass / gradient glow
   ============================================================ */

:root {
  --bg:        #070b18;
  --bg-2:      #0d1428;
  --surface:   rgba(255, 255, 255, .045);
  --surface-2: rgba(255, 255, 255, .075);
  --line:      rgba(255, 255, 255, .11);
  --text:      #e8ecf8;
  --muted:     #97a3c4;
  --accent:    #6ea8ff;
  --accent-2:  #4ee0c8;
  --glow-1:    rgba(110, 168, 255, .30);
  --glow-2:    rgba(78, 224, 200, .20);
  --glow-3:    rgba(150, 96, 255, .18);
  --glow-a:    12%;
  --glow-b:    92%;
  --radius:    18px;
  --max:       1080px;
  --font:      "Inter", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background:
    radial-gradient(760px 480px at var(--glow-a) -8%, var(--glow-1), transparent 62%),
    radial-gradient(680px 460px at var(--glow-b) 4%,  var(--glow-2), transparent 60%),
    radial-gradient(900px 620px at 50% 108%, var(--glow-3), transparent 64%),
    linear-gradient(180deg, var(--bg), var(--bg-2));
  background-attachment: fixed;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-2); }

.shell {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 28px 22px 56px;
}

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

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  padding: 14px 18px;
  margin-bottom: 34px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.06rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--text);
}
.brand:hover { color: var(--text); }

.brand .mark {
  width: 13px;
  height: 13px;
  border-radius: 4px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 14px rgba(110, 168, 255, .75);
}

.legal-nav { display: flex; gap: 6px; flex-wrap: wrap; }

.legal-nav a {
  padding: 6px 14px;
  border-radius: 999px;
  font-size: .86rem;
  color: var(--muted);
  border: 1px solid transparent;
  transition: color .18s, background .18s, border-color .18s;
}
.legal-nav a:hover { color: var(--text); background: var(--surface-2); }
.legal-nav a.active { color: var(--text); border-color: var(--line); background: var(--surface-2); }

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

.hero {
  text-align: center;
  padding: 40px 8px 46px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 26px;
  padding: 7px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  font-size: .8rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 0 0 rgba(78, 224, 200, .7);
  animation: pulse 2.1s infinite;
}

@keyframes pulse {
  70%  { box-shadow: 0 0 0 10px rgba(78, 224, 200, 0); }
  100% { box-shadow: 0 0 0 0 rgba(78, 224, 200, 0); }
}

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(2.1rem, 6vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -.025em;
  font-weight: 800;
  background: linear-gradient(180deg, #ffffff 25%, #9fb4e6);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tagline {
  max-width: 620px;
  margin: 0 auto 14px;
  font-size: 1.09rem;
  color: var(--accent-2);
}

.intro {
  max-width: 640px;
  margin: 0 auto;
  color: var(--muted);
}

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

.card {
  padding: 32px;
  margin-top: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 24px 60px rgba(0, 0, 0, .35);
}

.card h2 {
  margin: 0 0 8px;
  font-size: 1.28rem;
  letter-spacing: -.01em;
}

.muted { margin: 0 0 24px; color: var(--muted); font-size: .95rem; }

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

.field { margin-bottom: 16px; }

.field label {
  display: block;
  margin-bottom: 7px;
  font-size: .8rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--muted);
}

.field input,
.field textarea {
  width: 100%;
  padding: 13px 15px;
  font: inherit;
  color: var(--text);
  background: rgba(6, 10, 22, .55);
  border: 1px solid var(--line);
  border-radius: 12px;
  outline: none;
  transition: border-color .18s, box-shadow .18s, background .18s;
}

.field textarea { resize: vertical; min-height: 120px; }

.field input:focus,
.field textarea:focus {
  border-color: rgba(110, 168, 255, .85);
  background: rgba(6, 10, 22, .78);
  box-shadow: 0 0 0 4px rgba(110, 168, 255, .16);
}

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

.btn {
  display: inline-block;
  padding: 13px 26px;
  font: inherit;
  font-weight: 600;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface-2);
  color: var(--text);
  cursor: pointer;
  transition: transform .16s, box-shadow .16s, background .16s, opacity .16s;
}
.btn:hover { transform: translateY(-1px); }

.btn.primary {
  border: 0;
  color: #06101f;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 12px 30px rgba(78, 224, 200, .22);
}
.btn.primary:disabled { opacity: .55; cursor: progress; transform: none; }

.status { min-height: 20px; margin: 14px 0 0; font-size: .92rem; color: var(--muted); }
.status.ok  { color: #6ff0cf; }
.status.err { color: #ff9aa9; }

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

.dev {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 16px;
  margin: 18px 0 0;
}

.dev > div {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: rgba(6, 10, 22, .35);
}

.dev dt {
  font-size: .74rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
}
.dev dd { margin: 5px 0 0; font-weight: 600; word-break: break-word; }

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

.legal { padding: 12px 4px 0; }

.crumbs {
  display: flex;
  gap: 9px;
  align-items: center;
  margin: 0 0 18px;
  font-size: .84rem;
  color: var(--muted);
}
.crumbs span { opacity: .5; }

.legal h1 {
  margin: 0 0 8px;
  font-size: clamp(1.7rem, 4.4vw, 2.5rem);
  letter-spacing: -.02em;
}

.updated { margin: 0 0 30px; font-size: .86rem; color: var(--muted); }

.legal article {
  padding: 30px 32px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.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-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -.005em;
  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 .18s; }
.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: 1.2rem;
  font-weight: 400;
  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: .78rem;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--accent);
  opacity: .85;
}

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

.legal article p { margin: 0 0 14px; color: #c8d2e8; }

.legal-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 22px;
}

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

.footer {
  margin-top: 44px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  font-size: .86rem;
  color: var(--muted);
}
.footer nav { display: flex; gap: 18px; flex-wrap: wrap; }
.footer p { margin: 0; }

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

@media (max-width: 620px) {
  .shell { padding: 18px 16px 44px; }
  .topbar { border-radius: 22px; justify-content: center; text-align: center; }
  .card, .legal article { padding: 24px 20px; }
  .hero { padding: 24px 0 32px; }
  .footer { flex-direction: column; align-items: flex-start; }
}

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

:root {
  --accent:   #8379f6;
  --accent-2: #eb60a1;
  --glow-1:   rgba(85, 71, 245, .30);
  --glow-2:   rgba(237, 69, 223, .20);
  --glow-3:   rgba(135, 225, 71, .20);
  --glow-a:   27%;
  --glow-b:   82%;
  --radius:   25px;
}