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HTML
<div class="tl7-wrap">
  <div class="tl7-thread"></div>

  <div class="tl7-entry tl7-system">
    <div class="tl7-avatar" aria-hidden="true">●</div>
    <div class="tl7-bubble">
      <p class="tl7-msg">Patient record opened · Case #PT-20419 · Admitted 08 Jan 2025</p>
    </div>
  </div>

  <div class="tl7-entry">
    <div class="tl7-avatar" aria-hidden="true">DR</div>
    <div class="tl7-bubble">
      <p class="tl7-who">Dr. Ananya Rao — Attending</p>
      <p class="tl7-msg">Initial assessment complete. Patient presents with persistent fatigue and elevated markers. Ordering full metabolic panel and chest imaging. Suspect autoimmune involvement — referring to rheumatology.</p>
      <span class="tl7-ts">08 Jan 2025 · 09:14</span>
    </div>
  </div>

  <div class="tl7-entry">
    <div class="tl7-avatar" aria-hidden="true">LB</div>
    <div class="tl7-bubble">
      <p class="tl7-who">Lab Results — Pathology</p>
      <p class="tl7-msg">ANA titre: 1:320 (positive). Anti-dsDNA elevated at 48 IU/mL. ESR 72 mm/hr. Results forwarded to rheumatology and attending physician.</p>
      <span class="tl7-ts">10 Jan 2025 · 14:32</span>
    </div>
  </div>

  <div class="tl7-entry">
    <div class="tl7-avatar" aria-hidden="true">RH</div>
    <div class="tl7-bubble">
      <p class="tl7-who">Dr. Marcos Lima — Rheumatology</p>
      <p class="tl7-msg">Based on clinical picture and serology, diagnosis consistent with SLE. Initiating hydroxychloroquine 400mg daily. Scheduling follow-up in 6 weeks. Patient counselled on sun avoidance and flare recognition.</p>
      <span class="tl7-ts">15 Jan 2025 · 11:05</span>
    </div>
  </div>

  <div class="tl7-entry tl7-system">
    <div class="tl7-avatar tl7-avatar-ok" aria-hidden="true">✓</div>
    <div class="tl7-bubble tl7-bubble-ok">
      <p class="tl7-msg">Medication dispensed · Pharmacy confirmed · Insurance pre-auth approved</p>
    </div>
  </div>

  <div class="tl7-entry">
    <div class="tl7-avatar" aria-hidden="true">NS</div>
    <div class="tl7-bubble">
      <p class="tl7-who">Nurse Yuki Tanaka — Follow-up</p>
      <p class="tl7-msg">6-week check-in completed. Patient reports reduced fatigue, joint pain improved significantly. No adverse drug reactions noted. Labs trending in right direction — ESR down to 41 mm/hr.</p>
      <span class="tl7-ts">26 Feb 2025 · 10:20</span>
    </div>
  </div>
</div>
CSS
.tl7-wrap {
  --tl7-bg: #0c1117;
  --tl7-a:  #00e5c8;
  background: var(--tl7-bg);
  padding: 2.5rem 1.75rem;
  max-width: 600px;
  margin: 0 auto;
  position: relative;
  font-family: 'Inter', system-ui, sans-serif;
}
.tl7-thread {
  position: absolute;
  left: calc(1.75rem + 19px);
  top: 2.5rem;
  bottom: 2.5rem;
  width: 1px;
  background: linear-gradient(to bottom, var(--tl7-a), rgba(0,229,200,0.05));
}
.tl7-entry {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  margin-bottom: 1.5rem;
  position: relative;
}
.tl7-entry:last-child { margin-bottom: 0; }
.tl7-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--tl7-a);
  position: relative;
  z-index: 2;
  border: 1px solid rgba(0,229,200,0.3);
  background: rgba(0,229,200,0.08);
  box-shadow: 0 0 0 3px var(--tl7-bg);
}
.tl7-bubble {
  flex: 1;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: 4px 16px 16px 16px;
  padding: 0.85rem 1rem;
  transition: border-color 0.2s, background 0.2s;
}
.tl7-bubble:hover {
  background: rgba(0,229,200,0.05);
  border-color: rgba(0,229,200,0.2);
}
.tl7-who {
  font-family: ui-monospace, monospace;
  font-size: 11px;
  color: var(--tl7-a);
  letter-spacing: 0.5px;
  margin-bottom: 0.3rem;
}
.tl7-msg {
  font-size: 13.5px;
  color: rgba(255,255,255,0.78);
  line-height: 1.6;
}
.tl7-ts {
  display: block;
  font-family: ui-monospace, monospace;
  font-size: 10px;
  color: rgba(255,255,255,0.3);
  margin-top: 0.5rem;
}
.tl7-system .tl7-bubble {
  background: transparent;
  border-style: dashed;
  border-color: rgba(255,255,255,0.08);
  border-radius: 8px;
  text-align: center;
}
.tl7-system .tl7-msg {
  font-family: ui-monospace, monospace;
  font-size: 11px;
  color: rgba(255,255,255,0.4);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}
.tl7-avatar-ok {
  background: rgba(0,229,200,0.12);
  border-color: rgba(0,229,200,0.3);
  color: var(--tl7-a);
}
.tl7-bubble-ok {
  border-color: rgba(0,229,200,0.2) !important;
  background: rgba(0,229,200,0.04) !important;
}
@media (max-width: 480px) {
  .tl7-wrap { padding: 1.5rem 1rem; }
  .tl7-thread { left: calc(1rem + 19px); }
}