:root {
  --bg: #0f172a;
  --card: #1e293b;
  --accent: #38bdf8;
  --accent-dark: #0284c7;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --success: #22c55e;
  --error: #ef4444;
  --border: #334155;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  background: linear-gradient(160deg, var(--bg), #111827);
  font-family: "Vazirmatn", "Tahoma", sans-serif;
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.card {
  background: var(--card);
  border-radius: 20px;
  max-width: 460px;
  width: 100%;
  padding: 32px 28px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
  border: 1px solid rgba(255,255,255,0.06);
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('assets/logo.jpg') center/60% no-repeat;
  opacity: 0.13;
  filter: grayscale(1) contrast(1.1);
  pointer-events: none;
  z-index: 0;
}
.card > * {
  position: relative;
  z-index: 1;
}
h1 {
  font-size: 1.4rem;
  margin: 0 0 6px;
  text-align: center;
}
p.sub {
  color: var(--muted);
  text-align: center;
  font-size: 0.9rem;
  margin: 0 0 24px;
  line-height: 1.7;
}
label {
  display: block;
  font-size: 0.85rem;
  margin-bottom: 6px;
  color: var(--muted);
}
input, textarea {
  width: 100%;
  background: #0f172a;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  margin-bottom: 18px;
  outline: none;
  transition: border-color 0.2s;
}
input:focus, textarea:focus { border-color: var(--accent); }
textarea { min-height: 120px; resize: vertical; }
button {
  width: 100%;
  padding: 13px;
  border: none;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #041018;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.1s;
}
button:active { transform: scale(0.98); }
button:disabled { opacity: 0.6; cursor: not-allowed; }
button.secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  margin-top: 10px;
}
.msg {
  margin-top: 16px;
  text-align: center;
  font-size: 0.9rem;
  min-height: 20px;
}
.msg.ok { color: var(--success); }
.msg.err { color: var(--error); }
.nav-link {
  display: block;
  text-align: center;
  margin-top: 18px;
  font-size: 0.8rem;
  color: var(--muted);
  text-decoration: none;
}
.nav-link:hover { color: var(--accent); }
.announce-banner {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #041018;
  border-radius: 12px;
  padding: 10px 14px;
  font-size: 0.85rem;
  margin-bottom: 18px;
  text-align: center;
  line-height: 1.6;
}