:root {
  --bg: #0b0a1a;
  --bg-2: #15112e;
  --card: rgba(26, 21, 56, 0.72);
  --border: rgba(212, 175, 106, 0.28);
  --gold: #d9b56c;
  --gold-soft: #f0d9a4;
  --violet: #9a7cff;
  --text: #ece6ff;
  --muted: #a49cc4;
  --error: #ff8f9c;
  --radius: 18px;
  --serif: 'Cormorant Garamond', Georgia, 'Times New Roman', serif;
  --sans: 'Be Vietnam Pro', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html { color-scheme: dark; }

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(ellipse at 50% -10%, #2a1f5c 0%, var(--bg-2) 40%, var(--bg) 75%) fixed;
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-weight: 300;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* Bầu trời sao: ba lớp chấm nhấp nháy lệch pha nhau */
.sky, .sky::before, .sky::after {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-repeat: repeat;
}
.sky {
  z-index: 0;
  background-image:
    radial-gradient(1px 1px at 20px 30px, #fff 50%, transparent 51%),
    radial-gradient(1px 1px at 90px 120px, #cfc4ff 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 160px 60px, #fff 50%, transparent 51%),
    radial-gradient(1px 1px at 230px 180px, #f0d9a4 50%, transparent 51%);
  background-size: 260px 220px;
  opacity: 0.55;
}
.sky::before {
  content: '';
  background-image:
    radial-gradient(1px 1px at 50px 80px, #fff 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 140px 20px, #e4dcff 50%, transparent 51%),
    radial-gradient(1px 1px at 200px 140px, #fff 50%, transparent 51%);
  background-size: 310px 260px;
  animation: twinkle 6s ease-in-out infinite alternate;
}
.sky::after {
  content: '';
  background-image:
    radial-gradient(2px 2px at 70px 200px, rgba(217, 181, 108, 0.9) 50%, transparent 51%),
    radial-gradient(1px 1px at 300px 90px, #fff 50%, transparent 51%);
  background-size: 420px 380px;
  animation: twinkle 9s ease-in-out infinite alternate-reverse;
}
@keyframes twinkle {
  from { opacity: 0.15; }
  to { opacity: 0.9; }
}

.wrap {
  position: relative;
  z-index: 1;
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 16px 32px;
}

.hero { text-align: center; margin-bottom: 32px; }
.sigil {
  font-size: 44px;
  color: var(--gold);
  text-shadow: 0 0 24px rgba(217, 181, 108, 0.6);
  line-height: 1;
}
h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(36px, 9vw, 60px);
  letter-spacing: 0.04em;
  margin: 12px 0 6px;
  background: linear-gradient(180deg, var(--gold-soft), var(--gold) 60%, #a5823f);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.tagline { margin: 0; color: var(--muted); font-size: 15px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.form { display: grid; gap: 16px; }
.row { display: grid; gap: 16px; grid-template-columns: 1fr 1fr; }
.field { display: grid; gap: 6px; font-size: 14px; color: var(--muted); }
.field em { font-style: normal; opacity: 0.7; }
.field input {
  width: 100%;
  min-height: 48px;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid rgba(154, 124, 255, 0.35);
  background: rgba(10, 8, 26, 0.7);
  color: var(--text);
  font: 400 16px var(--sans);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.field input:focus {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(217, 181, 108, 0.18);
}
.field input::-webkit-calendar-picker-indicator { filter: invert(0.85) sepia(0.4); cursor: pointer; }

.error { margin: 0; color: var(--error); font-size: 14px; }

.btn {
  min-height: 52px;
  border: 0;
  border-radius: 999px;
  padding: 14px 24px;
  font: 600 18px var(--serif);
  letter-spacing: 0.06em;
  color: #1a1330;
  background: linear-gradient(135deg, var(--gold-soft), var(--gold) 55%, #b38a45);
  box-shadow: 0 6px 24px rgba(217, 181, 108, 0.3);
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 8px 30px rgba(217, 181, 108, 0.45); }
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 2px solid var(--gold-soft); outline-offset: 3px; }
.btn-ghost {
  display: block;
  margin: 24px auto 0;
  background: transparent;
  color: var(--gold);
  border: 1px solid var(--border);
  box-shadow: none;
}

.result { margin-top: 8px; }
.result:not([hidden]) { animation: rise 0.6s ease-out; }
.greeting { text-align: center; margin-bottom: 16px; }
.greeting h2 {
  font-family: var(--serif);
  font-size: clamp(26px, 6vw, 34px);
  font-weight: 600;
  margin: 0 0 4px;
  color: var(--gold-soft);
}
.greeting p { margin: 0; color: var(--muted); font-size: 14px; }

.cards { display: grid; gap: 16px; grid-template-columns: 1fr 1fr; }
.cards .card { animation: rise 0.6s ease-out both; }
.cards .card:nth-child(2) { animation-delay: 0.08s; }
.cards .card:nth-child(3) { animation-delay: 0.16s; }
.cards .card:nth-child(4) { animation-delay: 0.24s; }
.cards .card:nth-child(5) { animation-delay: 0.32s; }
.cards .wide { grid-column: 1 / -1; }

.r-head { display: flex; align-items: center; gap: 14px; margin-bottom: 10px; }
.r-icon {
  flex: none;
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-size: 26px;
  color: var(--gold);
  background: radial-gradient(circle, rgba(154, 124, 255, 0.28), rgba(154, 124, 255, 0.05));
  border: 1px solid var(--border);
}
.r-label { margin: 0; font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--violet); }
.r-title { margin: 2px 0 0; font-family: var(--serif); font-size: 24px; font-weight: 600; line-height: 1.2; color: var(--text); }
.r-sub { margin: 0 0 8px; font-size: 13px; color: var(--muted); }
.r-text { margin: 0; font-size: 15px; }
.r-note { margin: 10px 0 0; font-size: 13px; color: var(--gold-soft); opacity: 0.85; }

.footer {
  margin-top: 40px;
  text-align: center;
  font-size: 12px;
  color: var(--muted);
  opacity: 0.8;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 600px) {
  .wrap { padding-top: 32px; }
  .row, .cards { grid-template-columns: 1fr; }
  .card { padding: 18px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}