:root {
  color-scheme: light;
  --bg: #f4efe6;
  --panel: rgba(255, 251, 245, 0.95);
  --panel-strong: #fffaf2;
  --border: #d9c8ae;
  --text: #2f2418;
  --muted: #72614c;
  --accent: #0d6c74;
  --accent-strong: #084f55;
  --accent-soft: #daf0f2;
  --warn: #b15a16;
  --warn-soft: #fde8d7;
  --ok: #2f6b3a;
  --ok-soft: #dff3df;
  --shadow: 0 20px 45px rgba(78, 58, 34, 0.12);
  --radius: 22px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Noto Sans TC", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(19, 139, 150, 0.12), transparent 30%),
    radial-gradient(circle at bottom right, rgba(222, 156, 86, 0.14), transparent 28%),
    linear-gradient(180deg, #f8f3eb 0%, #eee3d1 100%);
  min-height: 100vh;
}

.page-shell {
  width: min(1400px, calc(100% - 32px));
  margin: 24px auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.sidebar,
.main-content {
  display: grid;
  gap: 20px;
}

.sidebar {
  grid-template-columns: minmax(300px, 420px);
  align-items: start;
}

.panel,
.brand-card {
  background: var(--panel);
  border: 1px solid rgba(217, 200, 174, 0.85);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

.brand-card,
.panel {
  padding: 22px;
}

.brand-card {
  padding: 18px 20px;
  background:
    linear-gradient(135deg, rgba(255, 250, 242, 0.98) 0%, rgba(247, 238, 224, 0.96) 100%);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
}

h1 {
  font-size: 1.9rem;
  line-height: 1.1;
}

.brand-topline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.brand-title-row {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: space-between;
  gap: 14px;
}

.brand-title-block {
  display: grid;
  gap: 6px;
}

.brand-subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
}

.mini-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(13, 108, 116, 0.1);
  color: var(--accent-strong);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

h2 {
  font-size: 1.2rem;
}

h3 {
  font-size: 1rem;
}

.muted {
  color: var(--muted);
  line-height: 1.65;
}

.panel-title-row,
.composer-row {
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
}

.badge-warn {
  background: var(--warn-soft);
  color: var(--warn);
}

.badge-ok {
  background: var(--ok-soft);
  color: var(--ok);
}

.badge-info {
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.file-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

button,
.file-picker span {
  border: 0;
  border-radius: 14px;
  padding: 12px 16px;
  font: inherit;
  cursor: pointer;
  transition: transform 0.15s ease, opacity 0.15s ease, background 0.15s ease;
}

button:hover,
.file-picker span:hover {
  transform: translateY(-1px);
}

.primary-button {
  background: linear-gradient(135deg, var(--accent) 0%, #1596a1 100%);
  color: #fff;
  min-width: 120px;
}

.secondary-button,
.file-picker span {
  background: #f4e6d3;
  color: var(--text);
}

.file-picker {
  position: relative;
  overflow: hidden;
}

.file-picker input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.quick-questions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.utility-hint {
  margin: 0;
  max-width: 360px;
  text-align: left;
}

.tools-launch-button {
  padding: 9px 14px;
  border-radius: 999px;
  font-size: 0.9rem;
  white-space: nowrap;
}

.tab-panel {
  padding: 18px;
  border-radius: 20px;
  border: 1px solid rgba(217, 200, 174, 0.78);
  background: var(--panel-strong);
}

.knowledge-panel {
  margin-top: 4px;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 24px;
}

.modal[hidden] {
  display: none;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(47, 36, 24, 0.4);
  backdrop-filter: blur(6px);
}

.modal-dialog {
  position: relative;
  z-index: 1;
  width: min(760px, 100%);
  display: grid;
  gap: 18px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: start;
}

.modal-close-button {
  min-width: 48px;
  min-height: 48px;
  padding: 0;
  border-radius: 999px;
  background: #fff4e5;
  color: var(--text);
  font-size: 1.5rem;
  line-height: 1;
}

.modal-hint {
  max-width: none;
}

.quick-question {
  background: #fff;
  color: var(--text);
  border: 1px solid var(--border);
  text-align: left;
}

.quick-question-inline {
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 0.84rem;
  background: #fff9ef;
}

.chat-panel {
  display: grid;
  gap: 18px;
}

.composer {
  display: grid;
  gap: 10px;
}

.composer-header {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  align-items: center;
  justify-content: flex-start;
}

.composer-label {
  font-weight: 700;
}

.inline-quick-questions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

textarea {
  width: 100%;
  resize: vertical;
  min-height: 110px;
  padding: 16px 18px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: #fffdf9;
  font: inherit;
  color: var(--text);
}

.chat-output {
  display: grid;
  gap: 14px;
}

.message {
  padding: 18px;
  border-radius: 20px;
  line-height: 1.7;
}

.user-message {
  background: #f9f3ea;
  border: 1px solid rgba(217, 200, 174, 0.8);
}

.assistant-message {
  background: linear-gradient(180deg, #fffdf8 0%, #fff7eb 100%);
  border: 1px solid rgba(13, 108, 116, 0.15);
}

.message-role {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 8px;
}

.empty-state {
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 20px;
}

.meta-list {
  display: grid;
  gap: 12px;
}

.meta-item {
  padding: 14px 16px;
  border-radius: 16px;
  background: var(--panel-strong);
  border: 1px solid rgba(217, 200, 174, 0.75);
}

.meta-label {
  display: block;
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 4px;
}

.sources {
  display: grid;
  gap: 12px;
}

.empty-sources {
  color: var(--muted);
}

.source-card {
  padding: 16px;
  border-radius: 18px;
  background: #fffdfa;
  border: 1px solid rgba(217, 200, 174, 0.8);
}

.source-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 8px;
}

.source-text {
  margin: 0;
  white-space: pre-wrap;
}

.answer-heading {
  margin: 0 0 10px;
  font-size: 1.15rem;
}

.answer-summary,
.answer-note {
  margin: 0 0 12px;
}

.answer-points {
  margin: 0;
  padding-left: 20px;
}

.answer-points li + li {
  margin-top: 8px;
}

code {
  font-family: "Consolas", "Courier New", monospace;
}

@media (max-width: 960px) {
  .sidebar,
  .grid {
    grid-template-columns: 1fr;
  }

  .composer-row {
    flex-direction: column;
    align-items: stretch;
  }

  .primary-button {
    width: 100%;
  }

  .utility-head {
    align-items: start;
    flex-direction: column;
  }

  .utility-hint {
    max-width: none;
    text-align: left;
  }

  .composer-header {
    align-items: start;
    flex-direction: column;
  }

  .modal {
    padding: 16px;
  }

  .brand-title-row {
    align-items: start;
  }
}