:root {
  --sidebar-w: 304px;
  --bg: #0f1117;
  --bg-soft: #151821;
  --panel: rgba(21, 24, 33, 0.78);
  --panel-solid: #171b25;
  --card: rgba(255, 255, 255, 0.055);
  --card-strong: rgba(255, 255, 255, 0.09);
  --border: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(255, 255, 255, 0.18);
  --text: #eef1f6;
  --muted: #a8afbd;
  --muted-2: #7f8797;
  --accent: #9b8cff;
  --accent-2: #63d6c5;
  --danger: #ff7d8a;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.34);
  --radius-xl: 24px;
  --radius-lg: 18px;
  --radius-md: 14px;
  --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

html[data-bs-theme="light"] {
  --bg: #f5f6fb;
  --bg-soft: #ffffff;
  --panel: rgba(255, 255, 255, 0.86);
  --panel-solid: #ffffff;
  --card: rgba(23, 28, 40, 0.05);
  --card-strong: rgba(23, 28, 40, 0.08);
  --border: rgba(20, 24, 32, 0.1);
  --border-strong: rgba(20, 24, 32, 0.18);
  --text: #171c27;
  --muted: #5e6675;
  --muted-2: #7a8393;
  --shadow: 0 24px 70px rgba(45, 51, 70, 0.12);
}

* { box-sizing: border-box; }

body {
  min-height: 100vh;
  margin: 0;
  font-family: var(--font-sans);
  background:
    radial-gradient(circle at top left, rgba(155, 140, 255, 0.22), transparent 30rem),
    radial-gradient(circle at 75% 10%, rgba(99, 214, 197, 0.14), transparent 28rem),
    var(--bg);
  color: var(--text);
  overflow: hidden;
}

.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  height: 100vh;
  width: 100vw;
}

.sidebar {
  border-right: 1px solid var(--border);
  background: rgba(12, 14, 20, 0.82);
  backdrop-filter: blur(24px);
  padding: 18px;
  display: flex;
  flex-direction: column;
  min-height: 0;
  z-index: 20;
}

html[data-bs-theme="light"] .sidebar {
  background: rgba(255, 255, 255, 0.78);
}

.sidebar-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.brand-mark,
.welcome-orb {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #11141c;
  box-shadow: 0 14px 38px rgba(99, 214, 197, 0.18);
  font-size: 1.22rem;
}

.brand-title {
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.brand-subtitle {
  color: var(--muted-2);
  font-size: 0.78rem;
}

.btn-new-chat {
  border: 1px solid var(--border-strong);
  background: linear-gradient(135deg, rgba(155, 140, 255, 0.25), rgba(99, 214, 197, 0.12));
  color: var(--text);
  border-radius: 16px;
  padding: 11px 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-new-chat:hover,
.btn-outline-soft:hover,
.btn-ghost:hover {
  border-color: var(--border-strong);
  background: var(--card-strong);
  color: var(--text);
}

.sidebar-section {
  margin-top: 20px;
}

.small-label {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.subtle-text { color: var(--muted-2) !important; }

.control-glass,
.control-glass:focus {
  color: var(--text);
  border-color: var(--border);
  background-color: var(--panel-solid);
  border-radius: 14px;
  box-shadow: none;
}

.control-glass option {
  color: var(--text);
  background: var(--panel-solid);
}

html[data-bs-theme="dark"] .control-glass,
html[data-bs-theme="dark"] .control-glass:focus {
  color: #eef1f6;
  background-color: #171b25;
  border-color: rgba(255, 255, 255, 0.16);
}

html[data-bs-theme="dark"] .control-glass option {
  color: #eef1f6;
  background: #171b25;
}

.setting-switch {
  padding: 12px 14px 12px 46px;
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 16px;
}

.form-check-input:checked {
  background-color: var(--accent);
  border-color: var(--accent);
}

.btn-outline-soft,
.btn-ghost {
  border: 1px solid var(--border);
  color: var(--muted);
  background: transparent;
  border-radius: 14px;
}

.btn-ghost { border-color: transparent; }

.settings-card {
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--card);
}

.settings-card hr { border-color: var(--border); }

.history-section {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.history-list {
  overflow-y: auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-right: 4px;
}

.history-item {
  display: flex;
  align-items: stretch;
  gap: 6px;
  width: 100%;
}

.history-load,
.history-delete {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--muted);
  min-height: 42px;
}

.history-load {
  flex: 1;
  min-width: 0;
  border-radius: 14px;
  padding: 8px 10px;
  text-align: left;
}

.history-title {
  display: block;
  width: 100%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 0.9rem;
  line-height: 1.15;
}

.history-date {
  display: block;
  margin-top: 3px;
  color: var(--muted-2);
  font-size: 0.72rem;
  line-height: 1.1;
}

.history-delete {
  width: 42px;
  flex: 0 0 42px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  padding: 0;
}

.history-item:hover .history-load,
.history-load:hover,
.history-delete:hover {
  background: var(--card-strong);
  color: var(--text);
}

.history-delete:hover {
  color: var(--danger);
  border-color: rgba(255, 125, 138, 0.36);
}

.history-item.active .history-load {
  color: var(--text);
  border-color: var(--border-strong);
  background: linear-gradient(135deg, rgba(155, 140, 255, 0.18), rgba(99, 214, 197, 0.10));
}

.sidebar-footer {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted-2);
  font-size: 0.8rem;
  padding-top: 16px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--accent-2);
  box-shadow: 0 0 0 5px rgba(99, 214, 197, 0.11);
}

.main-panel {
  min-width: 0;
  min-height: 0;
  position: relative;
  display: flex;
  flex-direction: column;
}

.mobile-topbar {
  height: 58px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  backdrop-filter: blur(18px);
  align-items: center;
  gap: 12px;
}

.mobile-title { font-weight: 800; }

.chat-stage {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  scroll-behavior: smooth;
  padding: 34px 16px 150px;
}

.messages,
.welcome-card,
.composer-wrap {
  width: min(940px, calc(100vw - var(--sidebar-w) - 36px));
  margin-inline: auto;
}

.welcome-card {
  min-height: 52vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 30px 14px;
}

.welcome-orb {
  width: 64px;
  height: 64px;
  border-radius: 24px;
  font-size: 1.7rem;
  margin-bottom: 18px;
}

.welcome-card h1 {
  font-size: clamp(2rem, 5vw, 3.8rem);
  letter-spacing: -0.06em;
  line-height: 1;
  margin-bottom: 16px;
}

.welcome-card p {
  max-width: 660px;
  color: var(--muted);
  font-size: 1.02rem;
}

.prompt-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 18px;
}

.chip {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 999px;
}

.chip:hover { background: var(--card-strong); }

.message-row {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  margin: 22px 0;
  animation: messageIn 0.18s ease-out;
}

.message-row.user {
  grid-template-columns: minmax(0, 1fr) 38px;
}

.avatar {
  width: 38px;
  height: 38px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  color: #10141c;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  font-weight: 800;
}

.user .avatar {
  grid-column: 2;
  background: linear-gradient(135deg, #f5d7a1, #ff9f9f);
}

.bubble {
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: var(--radius-xl);
  padding: 16px 18px;
  box-shadow: 0 8px 36px rgba(0, 0, 0, 0.08);
  overflow-wrap: anywhere;
}

.user .bubble {
  grid-column: 1;
  background: linear-gradient(135deg, rgba(155, 140, 255, 0.20), rgba(99, 214, 197, 0.12));
  justify-self: end;
  max-width: 82%;
}

.assistant .bubble { max-width: 100%; }
.system .bubble { background: rgba(255, 213, 128, 0.10); }
.tool .bubble { background: var(--card); }
.error .bubble {
  border-color: rgba(255, 125, 138, 0.38);
  background: rgba(255, 125, 138, 0.11);
}

.bubble p:last-child { margin-bottom: 0; }
.bubble a { color: var(--accent-2); }
.bubble ul, .bubble ol { padding-left: 1.4rem; }
.bubble blockquote {
  border-left: 3px solid var(--border-strong);
  color: var(--muted);
  padding-left: 1rem;
}

.message-role {
  font-size: 0.74rem;
  color: var(--muted-2);
  font-weight: 700;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.thinking-box,
.tool-results-box {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
  color: var(--muted);
}

.thinking-box {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.thinking-dots::after {
  content: "";
  animation: dots 1.15s steps(4, end) infinite;
}

.tool-results-box {
  margin: 14px 0 4px;
}

.tool-results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.tool-card {
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.08);
  border-radius: 16px;
  padding: 12px;
  margin-top: 10px;
}

html[data-bs-theme="light"] .tool-card { background: rgba(23, 28, 40, 0.035); }

.tool-card-title {
  font-weight: 800;
  margin-bottom: 4px;
}

.tool-card-url {
  display: block;
  color: var(--accent-2);
  font-size: 0.82rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 6px;
}

.tool-card-snippet,
.tool-card-content {
  color: var(--muted);
  font-size: 0.92rem;
}

.tool-card-content {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed var(--border);
  white-space: pre-wrap;
}

pre {
  background: #090b10;
  color: #eef1f6;
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 16px;
  padding: 14px;
  overflow-x: auto;
}

code {
  font-family: var(--font-mono);
  border-radius: 7px;
  padding: 0.12em 0.32em;
  background: rgba(155, 140, 255, 0.14);
  color: inherit;
}

pre code {
  background: transparent;
  padding: 0;
}

.composer-wrap {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: 0;
  padding: 14px 0 22px;
  background: linear-gradient(to top, var(--bg) 70%, transparent);
}

.composer-meta {
  display: flex;
  gap: 8px;
  margin: 0 8px 8px;
}

.composer {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  padding: 10px;
  border: 1px solid var(--border-strong);
  border-radius: 24px;
  background: var(--panel);
  backdrop-filter: blur(28px);
  box-shadow: var(--shadow);
}

.composer-input {
  flex: 1;
  min-height: 48px;
  max-height: 220px;
  resize: none;
  border: 0;
  outline: none;
  color: var(--text);
  background: transparent;
  padding: 12px 12px;
  line-height: 1.55;
}

.composer-input::placeholder { color: var(--muted-2); }

.send-btn {
  min-width: 94px;
  height: 48px;
  border: 0;
  border-radius: 18px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #10141c;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
}

.send-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.send-btn.cancel {
  background: rgba(255, 125, 138, 0.20);
  color: var(--danger);
  border: 1px solid rgba(255, 125, 138, 0.32);
}

@keyframes dots {
  0% { content: ""; }
  25% { content: "."; }
  50% { content: ".."; }
  75%, 100% { content: "..."; }
}

@keyframes messageIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 991.98px) {
  body { overflow: hidden; }
  .app-shell { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(86vw, var(--sidebar-w));
    transform: translateX(-105%);
    transition: transform 0.22s ease;
  }
  .sidebar.open { transform: translateX(0); }
  .mobile-topbar { display: flex; }
  .messages,
  .welcome-card,
  .composer-wrap {
    width: min(940px, calc(100vw - 28px));
  }
  .chat-stage { padding-top: 18px; }
  .user .bubble { max-width: 92%; }
}

@media (max-width: 575.98px) {
  .composer {
    border-radius: 20px;
    gap: 8px;
  }
  .send-btn {
    min-width: 52px;
    width: 52px;
    padding: 0;
  }
  .send-btn span { display: none; }
  .message-row,
  .message-row.user {
    grid-template-columns: 1fr;
  }
  .avatar { display: none; }
  .user .bubble,
  .assistant .bubble,
  .system .bubble,
  .tool .bubble,
  .error .bubble {
    grid-column: 1;
    max-width: 100%;
    justify-self: stretch;
  }
}