.akac {
  --akac-accent: #2f6f6a;
  --akac-ink: #1f2a2e;
  --akac-sub: #5f6b70;
  --akac-line: #d9dfe1;
  --akac-bg: #ffffff;
  --akac-soft: #f2f5f5;
  box-sizing: border-box;
  max-width: 720px;
  margin: 1.5em auto;
  border: 1px solid var(--akac-line);
  border-radius: 14px;
  background: var(--akac-bg);
  color: var(--akac-ink);
  font: inherit;
  line-height: 1.7;
  overflow: hidden;
}
.akac *, .akac *::before, .akac *::after { box-sizing: border-box; }

.akac-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 14px 18px;
  border-top: 4px solid var(--akac-accent);
  border-bottom: 1px solid var(--akac-line);
}
.akac-title { font-weight: 700; font-size: 1.05em; }
.akac-note { font-size: 0.8em; color: var(--akac-sub); }

.akac-log {
  height: 440px;
  max-height: 60vh;
  overflow-y: auto;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--akac-soft);
}

.akac-msg {
  max-width: 85%;
  padding: 10px 14px;
  border-radius: 12px;
  font-size: 0.95em;
  word-break: break-word;
}
.akac-model {
  align-self: flex-start;
  background: var(--akac-bg);
  border: 1px solid var(--akac-line);
  border-top-left-radius: 4px;
}
.akac-user {
  align-self: flex-end;
  background: var(--akac-accent);
  color: #fff;
  border-top-right-radius: 4px;
}
.akac-msg a { color: var(--akac-accent); text-decoration: underline; }
.akac-user a { color: #fff; }

.akac-typing { display: flex; gap: 5px; padding: 14px 16px; }
.akac-typing span {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--akac-sub);
  animation: akac-dot 1.2s infinite ease-in-out;
}
.akac-typing span:nth-child(2) { animation-delay: 0.15s; }
.akac-typing span:nth-child(3) { animation-delay: 0.3s; }
@keyframes akac-dot {
  0%, 80%, 100% { opacity: 0.25; transform: translateY(0); }
  40% { opacity: 1; transform: translateY(-3px); }
}

.akac-handoff {
  align-self: flex-start;
  max-width: 85%;
  padding: 12px 14px;
  border-left: 3px solid var(--akac-accent);
  background: var(--akac-bg);
  border-radius: 4px 12px 12px 4px;
  font-size: 0.9em;
}
.akac-handoff p { margin: 0 0 8px; }
.akac-handoff-btns { display: flex; flex-wrap: wrap; gap: 8px; }
.akac-btn {
  display: inline-block;
  padding: 8px 14px;
  border: 1px solid var(--akac-accent);
  border-radius: 999px;
  color: var(--akac-accent);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95em;
}
.akac-btn:hover { background: var(--akac-soft); }
.akac-btn-line { background: #06c755; border-color: #06c755; color: #fff; }
.akac-btn-line:hover { background: #05b04b; }

.akac-form {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid var(--akac-line);
  margin: 0;
}
.akac-input {
  flex: 1;
  min-height: 44px;
  max-height: 140px;
  resize: none;
  padding: 10px 12px;
  border: 1px solid var(--akac-line);
  border-radius: 10px;
  font: inherit;
  font-size: 16px; /* iOS のズーム防止 */
  line-height: 1.5;
  color: var(--akac-ink);
  background: var(--akac-bg);
}
.akac-input:focus { outline: 2px solid var(--akac-accent); outline-offset: 1px; border-color: transparent; }
.akac-send {
  min-height: 44px;
  padding: 0 18px;
  border: 0;
  border-radius: 10px;
  background: var(--akac-accent);
  color: #fff;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}
.akac-send:disabled { opacity: 0.5; cursor: default; }
.akac-send:focus-visible, .akac-btn:focus-visible { outline: 2px solid var(--akac-ink); outline-offset: 2px; }

.akac-foot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 4px 12px;
  padding: 0 14px 12px;
  font-size: 0.75em;
  color: var(--akac-sub);
}
.akac-direct a { color: var(--akac-accent); margin-left: 6px; }

.akac-sr {
  position: absolute !important;
  width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

@media (max-width: 480px) {
  .akac { border-radius: 10px; margin: 1em 0; }
  .akac-log { height: 60vh; padding: 12px; }
  .akac-msg, .akac-handoff { max-width: 92%; }
}
@media (prefers-reduced-motion: reduce) {
  .akac-typing span { animation: none; opacity: 0.6; }
}

/* ボット対策：ハニーポットは非表示、Turnstileは必要時のみ表示 */
.akac-hp { position: absolute !important; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.akac-ts:empty { display: none; }
.akac-ts { display: flex; justify-content: center; padding: 8px 12px 0; }