/* ── Layout & Masthead ── */

.wrap {
  max-width: 1040px;
  margin: 0 auto;
  padding: 32px 24px 80px;
}

/* Floating Masthead */
header.masthead {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding: 14px 22px;
  margin-bottom: 36px;
  background: rgba(15, 18, 26, 0.75);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  border: 1px solid var(--border-hairline);
  border-radius: var(--r-full);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
}

.masthead-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-icon {
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: linear-gradient(135deg, #6366f1, #3b82f6);
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  color: #fff;
  box-shadow: 0 0 16px rgba(99, 102, 241, 0.4);
}

header.masthead h1 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink-title);
}

.masthead-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.icon-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-hairline);
  color: var(--ink-secondary);
  border-radius: var(--r-full);
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.icon-btn:hover {
  background: rgba(255, 255, 255, 0.09);
  color: #fff;
  border-color: var(--border-hover);
}

.stamp {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-muted);
  border: 1px solid var(--border-hairline);
  padding: 6px 14px;
  border-radius: var(--r-full);
  background: rgba(255, 255, 255, 0.02);
}

/* Card Surface */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--r-lg);
  padding: 36px;
  box-shadow: var(--shadow-card);
  margin-bottom: 24px;
  position: relative;
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
}

footer {
  text-align: center;
  font-size: 13px;
  color: var(--ink-muted);
  margin-top: 56px;
  font-family: var(--font-mono);
}

.hidden {
  display: none !important;
}

@media (max-width: 680px) {
  .wrap {
    padding: 16px 16px 60px;
  }
  header.masthead {
    border-radius: var(--r-md);
    padding: 12px 16px;
    margin-bottom: 24px;
  }
  .card {
    padding: 24px 20px;
    border-radius: var(--r-md);
  }
}