:root {
  color-scheme: light;
  --bg: #eef1f5;
  --bg-top: #fbfcfe;
  --panel: rgba(255, 255, 255, 0.54);
  --panel-strong: rgba(255, 255, 255, 0.76);
  --panel-solid: #ffffff;
  --control: rgba(255, 255, 255, 0.72);
  --text: #12151c;
  --muted: #68707f;
  --line: rgba(29, 35, 45, 0.12);
  --line-strong: rgba(29, 35, 45, 0.2);
  --primary: #1f2937;
  --primary-strong: #111827;
  --primary-soft: rgba(31, 41, 55, 0.08);
  --accent: #3b82f6;
  --accent-soft: rgba(59, 130, 246, 0.08);
  --danger: #b42318;
  --danger-soft: #fff1f0;
  --success: #248a3d;
  --success-soft: rgba(52, 199, 89, 0.15);
  --shadow: 0 24px 80px rgba(24, 31, 43, 0.13);
  --shadow-soft: 0 10px 30px rgba(24, 31, 43, 0.08);
  --focus: rgba(59, 130, 246, 0.24);
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #0a0c10;
    --bg-top: #161920;
    --panel: rgba(28, 31, 39, 0.54);
    --panel-strong: rgba(38, 42, 52, 0.72);
    --panel-solid: #1d2129;
    --control: rgba(255, 255, 255, 0.08);
    --text: #f5f7fb;
    --muted: #a2a9b6;
    --line: rgba(236, 241, 247, 0.12);
    --line-strong: rgba(236, 241, 247, 0.22);
    --primary: #f5f7fb;
    --primary-strong: #ffffff;
    --primary-soft: rgba(255, 255, 255, 0.1);
    --accent: #7ab7ff;
    --accent-soft: rgba(122, 183, 255, 0.12);
    --danger: #ff8b7f;
    --danger-soft: rgba(255, 139, 127, 0.13);
    --success: #5ee084;
    --success-soft: rgba(94, 224, 132, 0.13);
    --shadow: 0 26px 90px rgba(0, 0, 0, 0.45);
    --shadow-soft: 0 14px 38px rgba(0, 0, 0, 0.28);
    --focus: rgba(122, 183, 255, 0.3);
  }
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 50% -12%, rgba(255, 255, 255, 0.9), transparent 34rem),
    linear-gradient(180deg, var(--bg-top), var(--bg) 48%, color-mix(in srgb, var(--bg), #9aa4b2 10%));
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
}

body::before {
  position: fixed;
  inset: 0;
  pointer-events: none;
  content: "";
  background:
    linear-gradient(115deg, rgba(255, 255, 255, 0.48), transparent 36%),
    linear-gradient(245deg, rgba(168, 183, 202, 0.22), transparent 42%);
  opacity: 0.62;
  mask-image: linear-gradient(180deg, black, transparent 70%);
}

button,
input,
textarea {
  font: inherit;
}

button {
  min-height: 44px;
  border: 1px solid color-mix(in srgb, var(--primary), transparent 88%);
  border-radius: 8px;
  padding: 0 18px;
  background: linear-gradient(180deg, color-mix(in srgb, var(--primary), white 10%), var(--primary));
  color: var(--bg-top);
  font-weight: 700;
  letter-spacing: 0;
  cursor: pointer;
  box-shadow: var(--shadow-soft);
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease, box-shadow 140ms ease;
}

button:hover {
  background: var(--primary-strong);
  transform: translateY(-1px);
}

button:active {
  transform: translateY(0);
}

button:disabled {
  cursor: wait;
  opacity: 0.62;
  transform: none;
}

button.secondary {
  border-color: var(--line);
  background: color-mix(in srgb, var(--panel-strong), transparent 8%);
  color: var(--text);
  box-shadow: none;
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
}

button.secondary:hover {
  border-color: var(--line-strong);
  color: var(--text);
}

button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 680;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--control);
  color: var(--text);
  padding: 12px 14px;
  outline: none;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.3);
  transition: border-color 140ms ease, box-shadow 140ms ease, background 140ms ease;
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
}

input::placeholder,
textarea::placeholder {
  color: color-mix(in srgb, var(--muted), transparent 18%);
}

input:focus,
textarea:focus {
  border-color: color-mix(in srgb, var(--accent), transparent 35%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.3), 0 0 0 4px var(--focus);
}

textarea {
  resize: vertical;
}

.shell {
  position: relative;
  width: min(100%, 980px);
  min-height: 100vh;
  margin: 0 auto;
  padding: 34px 28px;
  display: grid;
  grid-template-rows: auto auto 1fr;
  gap: 14px;
}

.topbar,
.token-panel,
.chat-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(32px) saturate(170%);
  -webkit-backdrop-filter: blur(32px) saturate(170%);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
}

.brand-lockup {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 15px;
}

.brand-mark {
  width: 56px;
  height: 56px;
  flex: 0 0 auto;
  border-radius: 17px;
  filter: drop-shadow(0 16px 24px rgba(24, 31, 43, 0.13));
}

@media (prefers-color-scheme: dark) {
  .brand-mark {
    filter: drop-shadow(0 16px 24px rgba(0, 0, 0, 0.36));
  }
}

h1 {
  margin: 0;
  font-size: 1.72rem;
  line-height: 1.08;
  letter-spacing: 0;
}

.subtitle {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 0.94rem;
  letter-spacing: 0;
}

.state {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 0.93rem;
}

.state::before {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--muted), transparent 25%);
  content: "";
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--muted), transparent 88%);
}

.state.ready {
  color: var(--success);
}

.state.ready::before {
  background: var(--success);
  box-shadow: 0 0 0 4px var(--success-soft);
}

.state.error {
  color: var(--danger);
}

.state.error::before {
  background: var(--danger);
  box-shadow: 0 0 0 4px var(--danger-soft);
}

.token-panel {
  padding: 18px 20px;
}

.token-panel[hidden] {
  display: none;
}

.token-row,
.composer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: end;
}

.chat-panel {
  min-height: 600px;
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  overflow: hidden;
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--panel-strong), transparent 18%), var(--panel)),
    var(--panel);
}

.messages {
  min-height: 0;
  padding: 26px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  scrollbar-color: var(--line-strong) transparent;
}

.empty {
  margin: auto;
  max-width: 420px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: color-mix(in srgb, var(--panel-strong), transparent 28%);
  color: var(--muted);
  padding: 16px 20px;
  text-align: center;
}

.message {
  width: min(82%, 680px);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px 16px;
  line-height: 1.55;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  box-shadow: 0 10px 28px rgba(24, 31, 43, 0.07), 0 1px 0 rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
}

.message.user {
  align-self: flex-end;
  border-color: color-mix(in srgb, var(--primary), transparent 72%);
  background: color-mix(in srgb, var(--primary), transparent 7%);
  color: var(--bg-top);
}

.message.assistant {
  align-self: flex-start;
  border-color: var(--line);
  background: color-mix(in srgb, var(--panel-strong), transparent 12%);
  white-space: normal;
}

.message.assistant.pending {
  min-width: 136px;
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
}

.message.assistant.pending::before {
  width: 18px;
  height: 18px;
  border: 2px solid color-mix(in srgb, var(--muted), transparent 76%);
  border-top-color: var(--text);
  border-radius: 999px;
  content: "";
  animation: spin 850ms linear infinite;
}

.message.assistant.pending::after {
  content: "Thinking";
  font-weight: 680;
}

.message.error {
  align-self: stretch;
  width: 100%;
  border-color: color-mix(in srgb, var(--danger), transparent 66%);
  background: var(--danger-soft);
  color: var(--danger);
}

.markdown-body > :first-child {
  margin-top: 0;
}

.markdown-body > :last-child {
  margin-bottom: 0;
}

.markdown-body p,
.markdown-body ul,
.markdown-body ol,
.markdown-body blockquote,
.markdown-body pre,
.markdown-body table,
.markdown-body hr {
  margin: 0.72rem 0;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  margin: 0.95rem 0 0.45rem;
  line-height: 1.18;
  letter-spacing: 0;
}

.markdown-body h1 {
  font-size: 1.35rem;
}

.markdown-body h2 {
  font-size: 1.2rem;
}

.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  font-size: 1.05rem;
}

.markdown-body ul,
.markdown-body ol {
  padding-left: 1.35rem;
}

.markdown-body li + li {
  margin-top: 0.32rem;
}

.markdown-body a {
  color: var(--accent);
  font-weight: 680;
  text-decoration-color: color-mix(in srgb, var(--accent), transparent 55%);
  text-underline-offset: 0.18em;
}

.markdown-body a:hover {
  text-decoration-color: currentColor;
}

.markdown-body blockquote {
  border-left: 3px solid var(--line-strong);
  padding: 0.12rem 0 0.12rem 0.85rem;
  color: var(--muted);
}

.markdown-body code {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: color-mix(in srgb, var(--panel-solid), transparent 28%);
  padding: 0.12rem 0.32rem;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.92em;
}

.markdown-body pre {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: color-mix(in srgb, var(--panel-solid), black 6%);
  padding: 0.85rem;
}

.markdown-body pre code {
  display: block;
  border: 0;
  background: transparent;
  padding: 0;
  white-space: pre;
}

.markdown-body .table-wrap {
  max-width: 100%;
  overflow-x: auto;
  margin: 0.72rem 0;
}

.markdown-body table {
  width: 100%;
  min-width: 420px;
  border-collapse: collapse;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: color-mix(in srgb, var(--panel-solid), transparent 12%);
}

.markdown-body th,
.markdown-body td {
  border-bottom: 1px solid var(--line);
  padding: 0.55rem 0.65rem;
  vertical-align: top;
}

.markdown-body th {
  background: color-mix(in srgb, var(--panel-solid), transparent 34%);
  font-weight: 760;
}

.markdown-body tr:last-child td {
  border-bottom: 0;
}

.markdown-body hr {
  border: 0;
  border-top: 1px solid var(--line);
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.chat-form {
  border-top: 1px solid var(--line);
  padding: 16px 20px 20px;
  background: color-mix(in srgb, var(--panel-strong), transparent 18%);
}

.composer textarea {
  min-height: 74px;
}

.composer button {
  min-width: 82px;
}

@media (max-width: 760px) {
  body {
    background: var(--bg);
  }

  body::before {
    opacity: 0.34;
  }

  .shell {
    padding: 12px;
    gap: 12px;
  }

  .topbar,
  .token-row,
  .composer {
    grid-template-columns: 1fr;
  }

  .topbar {
    display: grid;
    padding: 16px;
  }

  .brand-mark {
    width: 48px;
    height: 48px;
    border-radius: 15px;
  }

  h1 {
    font-size: 1.42rem;
  }

  .chat-panel {
    min-height: 560px;
  }

  .messages {
    padding: 16px;
  }

  .message {
    width: 100%;
  }
}