:root {
  color-scheme: light;
  --bg: #f7f3ec;
  --surface: #fffdf8;
  --ink: #191a1c;
  --muted: #6f6a62;
  --line: #ded6c8;
  --gold: #c48a24;
  --coral: #df6b58;
  --teal: #247c72;
  --assistant: #ffffff;
  --user: #152521;
  --shadow: 0 18px 50px rgba(31, 26, 18, 0.14);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  background:
    linear-gradient(135deg, rgba(196, 138, 36, 0.18), transparent 34%),
    linear-gradient(315deg, rgba(36, 124, 114, 0.17), transparent 38%),
    var(--bg);
  color: var(--ink);
}

button,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr) auto auto;
  width: min(980px, 100%);
  min-height: 100vh;
  margin: 0 auto;
  padding: 18px;
  gap: 12px;
}

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px;
  background: rgba(255, 253, 248, 0.78);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.brand {
  display: flex;
  align-items: center;
  min-width: 0;
  gap: 12px;
}

.brand__mark {
  flex: 0 0 auto;
  border-radius: 8px;
  box-shadow: 0 8px 20px rgba(21, 21, 21, 0.18);
}

.brand__text {
  min-width: 0;
}

.brand h1 {
  margin: 0;
  font-size: 1.2rem;
  line-height: 1.15;
  letter-spacing: 0;
}

.brand p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.ghost-button,
.send-button,
.prompt-row button {
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  transition:
    transform 0.16s ease,
    border-color 0.16s ease,
    background 0.16s ease;
}

.ghost-button {
  flex: 0 0 auto;
  padding: 0 14px;
  background: #fff;
  color: var(--ink);
}

.ghost-button:hover,
.prompt-row button:hover {
  border-color: rgba(196, 138, 36, 0.65);
  transform: translateY(-1px);
}

.context-strip {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 0 2px 2px;
}

.context-strip span {
  flex: 0 0 auto;
  padding: 7px 10px;
  border: 1px solid rgba(36, 124, 114, 0.22);
  border-radius: 999px;
  background: rgba(255, 253, 248, 0.72);
  color: var(--teal);
  font-size: 0.86rem;
}

.chat-log {
  display: flex;
  min-height: 360px;
  flex-direction: column;
  gap: 12px;
  overflow-y: auto;
  padding: 4px 2px 10px;
  scroll-behavior: smooth;
}

.message {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 10px;
  align-items: end;
  max-width: 82%;
}

.message--user {
  grid-template-columns: minmax(0, 1fr) 42px;
  align-self: flex-end;
}

.avatar {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: 8px;
  background: #151515;
  color: #f3c969;
  font-weight: 800;
}

.message--user .avatar {
  grid-column: 2;
  background: var(--teal);
  color: #fff;
}

.bubble {
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--assistant);
  box-shadow: 0 8px 24px rgba(31, 26, 18, 0.08);
  line-height: 1.68;
  white-space: pre-wrap;
  word-break: break-word;
}

.message--user .bubble {
  grid-column: 1;
  grid-row: 1;
  border-color: rgba(21, 37, 33, 0.35);
  background: var(--user);
  color: #fff;
}

.message--pending .bubble {
  color: var(--muted);
}

.prompt-row {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 2px;
}

.prompt-row button {
  flex: 0 0 auto;
  padding: 0 12px;
  background: rgba(255, 253, 248, 0.82);
  color: var(--ink);
}

.composer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: end;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 253, 248, 0.86);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.composer textarea {
  width: 100%;
  max-height: 180px;
  resize: none;
  border: 0;
  outline: none;
  background: transparent;
  color: var(--ink);
  line-height: 1.55;
}

.composer textarea::placeholder {
  color: #8f877c;
}

.send-button {
  padding: 0 18px;
  border-color: var(--teal);
  background: var(--teal);
  color: #fff;
  font-weight: 700;
}

.send-button:disabled {
  cursor: wait;
  border-color: #a7aaa5;
  background: #a7aaa5;
}

.error-text {
  color: #a73a2d;
}

@media (max-width: 720px) {
  .app-shell {
    padding: 10px;
    gap: 10px;
  }

  .chat-header {
    padding: 10px;
  }

  .brand__mark {
    width: 42px;
    height: 42px;
  }

  .brand h1 {
    font-size: 1.05rem;
  }

  .ghost-button {
    padding: 0 10px;
  }

  .message {
    max-width: 94%;
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 8px;
  }

  .message--user {
    grid-template-columns: minmax(0, 1fr) 34px;
  }

  .avatar {
    width: 34px;
    height: 34px;
    font-size: 0.82rem;
  }

  .bubble {
    padding: 10px 12px;
    font-size: 0.96rem;
  }

  .composer {
    grid-template-columns: minmax(0, 1fr) 72px;
  }
}