:root {
  --bg: #021114;
  --bg-2: #03191d;
  --panel: #05252b;
  --panel-2: #083a42;
  --line: rgba(118, 220, 216, 0.18);
  --line-strong: rgba(118, 220, 216, 0.34);
  --text: #f3ffff;
  --muted: #9fd3d1;
  --accent: #76dcd8;
  --accent-2: #36a8a0;
  --danger: #ff8d8d;
  --warn: #ffd66e;
  --ok: #82f0b7;
  --shadow: rgba(0, 0, 0, 0.38);
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(54, 168, 160, 0.14), transparent 32rem),
    linear-gradient(135deg, var(--bg), #00090b 70%);
  color: var(--text);
}
button, textarea, input, select { font: inherit; }
button { cursor: pointer; }

.app-shell {
  display: grid;
  grid-template-columns: 316px minmax(0, 1fr);
  height: 100vh;
  min-height: 620px;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 18px;
  border-right: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(3, 25, 29, 0.96), rgba(2, 17, 20, 0.98));
  padding: 18px;
  box-shadow: 20px 0 50px rgba(0, 0, 0, 0.22);
}
.brand-block {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(8, 58, 66, 0.58);
}
.brand-logo {
  width: 48px;
  height: 48px;
  object-fit: contain;
  flex: 0 0 auto;
  filter: drop-shadow(0 5px 12px rgba(0,0,0,0.42));
}
.brand-name {
  font-weight: 760;
  letter-spacing: 0.02em;
}
.brand-sub {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.35;
}
.new-chat {
  border: 1px solid var(--line-strong);
  color: var(--bg);
  background: linear-gradient(135deg, var(--accent), #a4fff9);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  font-weight: 760;
  box-shadow: 0 10px 24px rgba(118, 220, 216, 0.16);
}
.conversation-list {
  flex: 1;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-right: 2px;
}
.conversation-item {
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text);
  padding: 11px 12px;
  text-align: left;
  min-height: 48px;
}
.conversation-item:hover, .conversation-item.active {
  border-color: var(--line);
  background: rgba(8, 58, 66, 0.58);
}
.conversation-item .title {
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  font-weight: 650;
}
.conversation-item .meta {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}
.sidebar-footer {
  border-top: 1px solid var(--line);
  padding-top: 14px;
  color: var(--muted);
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.link-button {
  color: var(--accent);
  background: none;
  border: 0;
  padding: 0;
}

.chat-main {
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr) auto;
  min-width: 0;
}
.topbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  padding: 18px 24px;
  border-bottom: 1px solid var(--line);
  background: rgba(2, 17, 20, 0.72);
  backdrop-filter: blur(18px);
}
.product-title {
  font-size: 20px;
  font-weight: 780;
}
.product-subtitle {
  color: var(--muted);
  font-size: 13px;
  margin-top: 3px;
}
.engine-status {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}
.status-pill {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 10px;
  color: var(--muted);
  font-size: 12px;
  background: rgba(8, 58, 66, 0.42);
}
.status-pill.ok { color: var(--ok); border-color: rgba(130, 240, 183, 0.45); }
.status-pill.warn { color: var(--warn); border-color: rgba(255, 214, 110, 0.45); }
.status-pill.err { color: var(--danger); border-color: rgba(255, 141, 141, 0.45); }
.status-pill.pending { color: var(--text); border-color: var(--line-strong); }

.notice-card {
  margin: 16px auto 0;
  width: min(980px, calc(100% - 36px));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(5, 37, 43, 0.66);
  padding: 13px 15px;
  color: var(--muted);
  font-size: 13px;
}
.notice-card strong { color: var(--text); }
.messages {
  overflow: auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  scroll-behavior: smooth;
}
.message {
  width: min(980px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 12px;
}
.message-role {
  color: var(--muted);
  font-size: 12px;
  font-weight: 760;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding-top: 14px;
}
.message-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(5, 37, 43, 0.74);
  box-shadow: 0 18px 45px var(--shadow);
  padding: 16px 18px;
  line-height: 1.6;
  overflow-wrap: anywhere;
}
.message.user .message-card {
  background: rgba(8, 58, 66, 0.84);
}
.message-card p { margin: 0 0 0.9em; }
.message-card p:last-child { margin-bottom: 0; }
.message-card pre {
  overflow: auto;
  padding: 12px;
  border-radius: var(--radius-sm);
  background: rgba(0, 9, 11, 0.78);
  border: 1px solid var(--line);
}
.message-card code {
  color: #d9fffb;
  background: rgba(0, 9, 11, 0.45);
  border-radius: 5px;
  padding: 1px 4px;
}
.message-card pre code { background: none; padding: 0; }
.raw-grid {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}
.provider-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(2, 17, 20, 0.54);
  overflow: hidden;
}
.provider-card summary {
  padding: 10px 12px;
  color: var(--accent);
  font-weight: 700;
  cursor: pointer;
}
.provider-card .provider-body {
  padding: 0 12px 12px;
  color: var(--muted);
}
.provider-card.error summary { color: var(--danger); }
.composer-wrap {
  padding: 12px 24px 20px;
  border-top: 1px solid var(--line);
  background: rgba(2, 17, 20, 0.86);
}
.engine-controls {
  width: min(980px, 100%);
  margin: 0 auto 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  color: var(--muted);
  font-size: 13px;
}
.engine-controls label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.engine-controls input[type="checkbox"] { accent-color: var(--accent-2); }
.synth-label { margin-left: auto; }
.engine-controls select {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 6px 8px;
}
.composer {
  width: min(980px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: end;
}
.composer textarea {
  resize: none;
  max-height: 220px;
  min-height: 52px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
  background: rgba(5, 37, 43, 0.94);
  color: var(--text);
  outline: none;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.1);
}
.composer textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(118, 220, 216, 0.12);
}
.composer button {
  min-height: 52px;
  border: 0;
  border-radius: var(--radius-lg);
  padding: 0 20px;
  background: linear-gradient(135deg, var(--accent), #a4fff9);
  color: var(--bg);
  font-weight: 800;
}
.composer button:disabled { opacity: 0.56; cursor: not-allowed; }
.settings-dialog {
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background: var(--bg-2);
  color: var(--text);
  width: min(440px, calc(100vw - 28px));
  box-shadow: 0 24px 80px rgba(0,0,0,0.6);
}
.settings-dialog::backdrop { background: rgba(0,0,0,0.58); }
.settings-panel { display: grid; gap: 14px; }
.settings-panel h2 { margin: 0; }
.settings-panel p { margin: 0; color: var(--muted); line-height: 1.5; }
.settings-panel label { display: grid; gap: 6px; color: var(--muted); }
.settings-panel input {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel);
  color: var(--text);
  padding: 11px;
}
.settings-panel menu { margin: 0; padding: 0; display: flex; justify-content: flex-end; gap: 10px; }
.settings-panel button {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel-2);
  color: var(--text);
  padding: 9px 12px;
}

@media (max-width: 880px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .topbar { align-items: flex-start; flex-direction: column; }
  .message { grid-template-columns: 1fr; gap: 6px; }
  .message-role { padding-top: 0; }
  .synth-label { margin-left: 0; }
}