:root {
  color-scheme: light;
  --bg: #f3f0e7;
  --panel: #fbfaf6;
  --panel-strong: #f7f3e8;
  --text: #1f2421;
  --muted: #6b6f68;
  --line: #dad2bf;
  --accent: #14532d;
  --accent-soft: #e4f0e7;
  --danger: #8a2d1f;
  --shadow: 0 18px 40px rgba(43, 39, 31, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Noto Sans SC", sans-serif;
  background: linear-gradient(180deg, #ede8da 0%, var(--bg) 100%);
  color: var(--text);
}

.login-overlay {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(31, 36, 33, 0.42);
  backdrop-filter: blur(10px);
  z-index: 20;
}

.login-overlay.active {
  display: flex;
}

.login-card {
  width: min(420px, 100%);
  padding: 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.login-form {
  margin-top: 12px;
}

.login-error {
  min-height: 20px;
  margin-top: 10px;
  color: var(--danger);
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
}

.sidebar {
  padding: 24px;
  border-right: 1px solid var(--line);
  background: rgba(251, 250, 246, 0.85);
  backdrop-filter: blur(12px);
}

.brand {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-bottom: 20px;
}

.brand-mark {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  background: var(--accent);
  color: white;
  font-weight: 700;
}

.brand h1,
.sources-header h2,
.panel h2 {
  margin: 0;
  font-size: 16px;
}

.brand p,
.sources-header p,
.hint,
.label,
.composer-hint,
.empty-state {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.panel {
  margin-top: 16px;
  padding: 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.connection-banner {
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  flex: 1;
}

.connection-gemini {
  background: #e8f4ea;
  color: #155724;
  border: 1px solid #bfdcc6;
}

.connection-openai {
  background: #e7f0fb;
  color: #174a7c;
  border: 1px solid #bfd2ec;
}

.connection-deepseek {
  background: #f1e9fb;
  color: #5b2b86;
  border: 1px solid #d8c1ef;
}

.connection-local {
  background: #f5efe2;
  color: #7a5620;
  border: 1px solid #e4d2ad;
}

.status-grid {
  margin-top: 12px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.status-grid strong {
  display: block;
  margin-top: 4px;
  font-size: 14px;
}

.field-label {
  display: block;
  margin-top: 12px;
  margin-bottom: 8px;
  font-size: 13px;
  color: var(--muted);
}

.text-input,
.composer-input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  color: var(--text);
  padding: 12px 14px;
  font: inherit;
}

.text-input:focus,
.composer-input:focus {
  outline: 2px solid #cfe0d2;
  border-color: #adc9b2;
}

.primary-btn,
.secondary-btn,
.chip {
  border: 0;
  border-radius: 8px;
  font: inherit;
}

.primary-btn {
  margin-top: 12px;
  background: var(--accent);
  color: white;
  padding: 11px 16px;
  cursor: pointer;
}

.secondary-btn {
  margin-top: 12px;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
  padding: 11px 16px;
  cursor: pointer;
}

.primary-btn:disabled {
  opacity: 0.7;
  cursor: wait;
}

.secondary-btn:disabled {
  opacity: 0.7;
  cursor: wait;
}

.chips {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  padding: 10px 12px;
  background: var(--panel-strong);
  color: var(--text);
  text-align: left;
  cursor: pointer;
}

.main-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
}

.chat-panel,
.sources-panel {
  min-height: 100vh;
  padding: 24px;
}

.chat-panel {
  display: grid;
  grid-template-rows: 1fr auto;
  gap: 16px;
}

.messages {
  overflow: auto;
  padding-right: 8px;
}

.message {
  max-width: 820px;
  margin-bottom: 14px;
  padding: 14px 16px;
  border-radius: 8px;
  border: 1px solid var(--line);
  line-height: 1.6;
  white-space: pre-wrap;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.message.user {
  margin-left: auto;
  background: var(--accent-soft);
}

.message.assistant {
  margin-right: auto;
}

.composer {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(251, 250, 246, 0.92);
  box-shadow: var(--shadow);
}

.composer-row {
  margin-top: 10px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}

.button-row {
  display: flex;
  gap: 10px;
  align-items: center;
}

.top-row {
  margin-top: 12px;
  align-items: flex-start;
}

.button-compact {
  margin-top: 0;
  padding: 10px 12px;
  white-space: nowrap;
}

.button-inline {
  margin-top: 12px;
}

.sources-panel {
  border-left: 1px solid var(--line);
  background: rgba(247, 243, 232, 0.8);
}

.sources-list {
  margin-top: 14px;
  display: grid;
  gap: 12px;
}

.source-card {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.source-meta {
  margin-bottom: 8px;
  font-size: 12px;
  color: var(--muted);
}

.source-card p {
  margin: 0;
  line-height: 1.6;
  white-space: pre-wrap;
}

@media (max-width: 1100px) {
  .app-shell,
  .main-panel {
    grid-template-columns: 1fr;
  }

  .sidebar,
  .sources-panel {
    border-right: 0;
    border-left: 0;
  }

  .chat-panel,
  .sources-panel {
    min-height: auto;
  }
}