:root {
  --bg: #f3efe3;
  --bg-strong: #e5dcc3;
  --paper: rgba(255, 252, 245, 0.9);
  --paper-strong: #fffaf0;
  --ink: #15251f;
  --muted: #59685f;
  --line: rgba(21, 37, 31, 0.12);
  --accent: #a14c1f;
  --accent-strong: #7b3512;
  --forest: #214438;
  --shadow: 0 18px 40px rgba(40, 34, 22, 0.12);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  font-family: "Microsoft JhengHei", "PingFang TC", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(161, 76, 31, 0.12), transparent 34%),
    radial-gradient(circle at bottom right, rgba(33, 68, 56, 0.12), transparent 30%),
    linear-gradient(180deg, #f6f1e4 0%, #efe7d1 100%);
}

code {
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 0.94em;
}

.backdrop {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(21, 37, 31, 0.03) 1px, transparent 1px),
    linear-gradient(rgba(21, 37, 31, 0.03) 1px, transparent 1px);
  background-size: 22px 22px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0.75));
}

.app-shell {
  position: relative;
  z-index: 1;
  width: min(1360px, calc(100% - 32px));
  margin: 28px auto 40px;
}

.hero {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr;
  gap: 20px;
  align-items: end;
  margin-bottom: 20px;
}

.hero-copy,
.hero-note,
.panel {
  background: var(--paper);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.5);
  box-shadow: var(--shadow);
}

.hero-copy {
  padding: 30px 32px;
  border-radius: var(--radius-xl);
}

.hero-note {
  padding: 22px 24px;
  border-radius: var(--radius-lg);
  color: var(--muted);
  line-height: 1.7;
}

.eyebrow {
  margin: 0 0 12px;
  font-size: 0.86rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

h1,
h2,
h3 {
  margin: 0;
  font-family: "PMingLiU", "Times New Roman", serif;
  font-weight: 700;
}

h1 {
  font-size: clamp(2.3rem, 5vw, 4.6rem);
  line-height: 0.96;
  letter-spacing: 0.01em;
}

h2 {
  font-size: 1.9rem;
}

h3 {
  font-size: 1.3rem;
}

.hero-text,
.panel-head p,
.answers-head p,
.field-hint,
.status-meta,
.answer-card-answer p,
.source-excerpt,
.source-score,
.hero-note p {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
}

.hero-text {
  margin-top: 14px;
  max-width: 56ch;
}

.workspace {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr) 340px;
  gap: 20px;
  align-items: start;
}

.panel {
  border-radius: var(--radius-xl);
  padding: 24px;
}

.controls-panel,
.sources-panel {
  position: sticky;
  top: 18px;
}

.panel-head {
  margin-bottom: 22px;
}

.panel-head h2 {
  margin-bottom: 8px;
}

.field {
  display: grid;
  gap: 10px;
  margin-bottom: 18px;
}

.field > span,
.samples-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--forest);
}

.compact-empty {
  min-height: 88px;
  padding: 14px;
}

.api-help {
  margin: -4px 0 14px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.58);
  border: 1px solid rgba(33, 68, 56, 0.09);
}

.api-help summary {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 12px 16px;
  cursor: pointer;
  font-weight: 700;
  color: var(--forest);
  list-style: none;
}

.api-help summary::-webkit-details-marker {
  display: none;
}

.api-help summary::after {
  content: "+";
  margin-left: auto;
  font-size: 1.1rem;
  color: var(--accent-strong);
}

.api-help[open] summary::after {
  content: "-";
}

.api-help-body {
  padding: 0 16px 14px;
}

.api-help a {
  color: var(--accent-strong);
  font-weight: 700;
}

.steps-list {
  margin: 10px 0 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.75;
}

.steps-list li + li {
  margin-top: 4px;
}

input[type="password"],
textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.82);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  font: inherit;
  color: var(--ink);
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

input[type="password"]:focus,
textarea:focus {
  border-color: rgba(161, 76, 31, 0.48);
  box-shadow: 0 0 0 4px rgba(161, 76, 31, 0.12);
  transform: translateY(-1px);
}

textarea {
  min-height: 140px;
  resize: vertical;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  color: var(--muted);
}

.file-picker {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  border: 1px dashed rgba(33, 68, 56, 0.32);
  background: rgba(255, 255, 255, 0.58);
  color: var(--forest);
  cursor: pointer;
  font-weight: 700;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.file-picker:hover {
  transform: translateY(-1px);
  border-color: rgba(161, 76, 31, 0.5);
  background: rgba(255, 255, 255, 0.78);
}

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

.source-file-list {
  display: grid;
  gap: 10px;
}

.source-file-item {
  display: grid;
  gap: 8px;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid rgba(21, 37, 31, 0.08);
}

.source-file-head {
  display: flex;
  gap: 10px;
  justify-content: space-between;
  align-items: start;
}

.source-file-name {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--forest);
  line-height: 1.5;
  word-break: break-word;
}

.source-file-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.source-badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(33, 68, 56, 0.08);
  color: var(--forest);
  font-size: 0.82rem;
  font-weight: 700;
}

.source-badge.warning {
  background: rgba(161, 76, 31, 0.1);
  color: var(--accent-strong);
}

.source-remove-btn {
  min-width: 72px;
  min-height: 36px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.74);
  color: var(--accent-strong);
  border: 1px solid rgba(161, 76, 31, 0.16);
  box-shadow: none;
}

.source-file-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.65;
}

.button-row {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.button-row-tight {
  margin-bottom: 8px;
}

button {
  border: none;
  border-radius: 999px;
  padding: 12px 18px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

button.primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-strong) 100%);
  color: #fff6ef;
  box-shadow: 0 14px 24px rgba(123, 53, 18, 0.24);
}

button.ghost,
.sample-chip {
  background: rgba(255, 255, 255, 0.64);
  color: var(--forest);
  border: 1px solid rgba(33, 68, 56, 0.12);
}

.verify-message {
  margin: 0 0 18px;
  min-height: 24px;
  font-size: 0.94rem;
  font-weight: 700;
  color: var(--muted);
}

.verify-message.loading {
  color: var(--accent);
}

.verify-message.success {
  color: #1f7a43;
}

.verify-message.error {
  color: #a1341f;
}

.status-stack {
  display: grid;
  gap: 12px;
}

.status-card {
  padding: 16px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid rgba(21, 37, 31, 0.07);
}

.status-label {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.status-card strong {
  display: block;
  margin-bottom: 6px;
  font-size: 1rem;
}

.samples {
  margin-top: 24px;
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

.sample-chip {
  padding-inline: 14px;
}

.ask-form {
  margin-bottom: 28px;
}

.answers-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: end;
  margin-bottom: 16px;
}

.answer-history,
.source-list {
  display: grid;
  gap: 14px;
}

.empty-state {
  min-height: 160px;
  display: grid;
  place-items: center;
  padding: 18px;
  border-radius: var(--radius-lg);
  border: 1px dashed rgba(33, 68, 56, 0.18);
  color: var(--muted);
  background: rgba(255, 255, 255, 0.38);
  text-align: center;
  line-height: 1.7;
}

.answer-card,
.source-card {
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(21, 37, 31, 0.08);
  border-radius: var(--radius-lg);
  padding: 18px;
}

.answer-card-question {
  margin: 0 0 12px;
  font-weight: 700;
  color: var(--forest);
  line-height: 1.6;
}

.answer-card-answer {
  display: grid;
  gap: 10px;
}

.answer-card-answer p {
  white-space: pre-line;
}

.citation-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.citation-tag {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(33, 68, 56, 0.08);
  color: var(--forest);
  font-size: 0.92rem;
  font-weight: 700;
}

.source-heading {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: start;
  margin-bottom: 10px;
}

.source-heading strong {
  font-size: 1.02rem;
  color: var(--forest);
}

.source-heading span {
  color: var(--muted);
  font-size: 0.88rem;
}

.source-score {
  font-size: 0.88rem;
  color: var(--accent);
}

@media (max-width: 1180px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .controls-panel,
  .sources-panel {
    position: static;
  }
}

@media (max-width: 860px) {
  .app-shell {
    width: min(100% - 20px, 100%);
    margin: 14px auto 28px;
  }

  .hero {
    grid-template-columns: 1fr;
  }

  .hero-copy,
  .hero-note,
  .panel {
    padding: 20px;
  }

  .answers-head {
    display: grid;
    gap: 8px;
  }
}