/* ---------- chat card ---------- */
.chat-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  /* Subtle hover lift - the shadow deepens and the card rises 2px so the
     surface reads as interactive, not just a static panel. */
  transition:
    transform 0.35s cubic-bezier(0.2, 0.9, 0.3, 1.2),
    box-shadow 0.35s ease;
  animation: fade-up 0.7s 0.4s ease-out both;
  display: flex;
  flex-direction: column;
  min-height: 520px;
  /* dvh keeps the card sized to the *visible* viewport on mobile, so when
     the keyboard opens the card shrinks instead of pushing the composer
     off-screen. vh fallback for older browsers. */
  max-height: min(74vh, 760px);
  max-height: min(74dvh, 760px);
  overflow: hidden;
  isolation: isolate;
  /* Keep touch / wheel scroll inside the chat - the inner .chat-log
     handles its own scroll and shouldn't chain to the page. */
  overscroll-behavior: contain;
}
.chat-card:hover {
  transform: translateY(-2px);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.6) inset,
    0 1px 2px rgba(15, 23, 23, 0.04),
    0 18px 40px -12px rgba(15, 23, 23, 0.16),
    0 40px 80px -28px color-mix(in srgb, var(--brand) 24%, transparent);
}
/* Soft brand glow underneath, anchored at top - adds depth without
   competing with content. */
.chat-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    80% 60% at 50% -10%,
    color-mix(in srgb, var(--brand) 12%, transparent),
    transparent 70%
  );
  pointer-events: none;
  z-index: 0;
}
.chat-card > * {
  position: relative;
  z-index: 1;
}

.chat-card-header {
  display: flex;
  align-items: center;
  padding: 0.9rem 1.1rem;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  gap: 0.75rem;
  min-width: 0;
  background: linear-gradient(
    180deg,
    color-mix(in srgb, var(--surface) 100%, transparent),
    color-mix(in srgb, var(--surface-2) 40%, var(--surface))
  );
}

/* CSS-rendered bot avatar: brand-gradient circle with the "U" initial. */
.bot-avatar {
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(
    135deg,
    var(--brand) 0%,
    var(--brand-strong) 100%
  );
  color: var(--on-brand);
  font-weight: 700;
  font-size: 0.98rem;
  letter-spacing: -0.02em;
  box-shadow:
    0 0 0 3px color-mix(in srgb, var(--brand) 18%, transparent),
    var(--shadow-brand);
  /* Slow breathe: barely-perceptible glow pulse signals the bot is awake.
     Distinct from the hard "online" status dot pulse. */
  animation: avatar-breathe 4.5s ease-in-out infinite;
}
@keyframes avatar-breathe {
  0%,
  100% {
    box-shadow:
      0 0 0 3px color-mix(in srgb, var(--brand) 18%, transparent),
      var(--shadow-brand);
  }
  50% {
    box-shadow:
      0 0 0 5px color-mix(in srgb, var(--brand) 22%, transparent),
      0 12px 30px -8px color-mix(in srgb, var(--brand) 60%, transparent);
  }
}

.chat-card-id {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
  min-width: 0; /* allow ellipsis on long emails */
  flex: 1;
}
.chat-card-name {
  font-weight: 650;
  color: var(--text);
  font-size: 1rem;
  letter-spacing: -0.005em;
}
.chat-card-meta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-muted);
  font-size: 0.82rem;
  min-width: 0;
  margin-top: 1px;
}
.chat-card-status {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--success) 18%, transparent);
  flex: 0 0 auto;
  position: relative;
}
.chat-card-status::after {
  content: "";
  position: absolute;
  inset: -2px;
  border-radius: 50%;
  background: var(--success);
  opacity: 0.35;
  animation: pulse 2.4s ease-out infinite;
}
@keyframes pulse {
  0% {
    transform: scale(0.6);
    opacity: 0.55;
  }
  70% {
    transform: scale(2);
    opacity: 0;
  }
  100% {
    transform: scale(2);
    opacity: 0;
  }
}
.chat-card-sep {
  flex: 0 0 auto;
  opacity: 0.65;
}
.chat-card-email {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
  font-feature-settings: "tnum";
}
/* New-chat (reset) - brand-tinted pill with leading + icon.
   Visually a destructive action: tooltip + JS confirm() warn before clearing. */
.btn-new-chat {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.85rem;
  font-size: 0.82rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--brand-strong);
  background: var(--brand-soft);
  border: 1px solid color-mix(in srgb, var(--brand) 28%, transparent);
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
  transition:
    background 0.18s ease,
    color 0.18s ease,
    border-color 0.18s ease,
    box-shadow 0.18s ease,
    transform 0.08s ease;
}
.btn-new-chat svg {
  display: block;
  opacity: 0.9;
  transition: transform 0.25s ease;
}
.btn-new-chat:hover {
  background: color-mix(in srgb, var(--brand) 16%, var(--surface));
  border-color: color-mix(in srgb, var(--brand) 50%, transparent);
  color: var(--brand-strong);
  box-shadow: 0 6px 16px -8px color-mix(in srgb, var(--brand) 50%, transparent);
}
.btn-new-chat:hover svg {
  transform: rotate(90deg);
}
.btn-new-chat:active {
  transform: translateY(1px);
}
:root[data-theme="dark"] .btn-new-chat {
  color: var(--brand);
}
:root[data-theme="dark"] .btn-new-chat:hover {
  color: var(--brand-strong);
}