:root {
  --bg: #f7f5ef;
  --paper: #ffffff;
  --ink: #14213d;
  --muted: #5f6368;
  --accent: #d97706;
  --accent-2: #0f766e;
  --border: #e6dfcf;
  --danger: #b91c1c;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, #fff4d6 0%, transparent 40%),
    radial-gradient(circle at bottom right, #d6fbf6 0%, transparent 45%),
    var(--bg);
}

.app-shell {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px;
  display: grid;
  gap: 14px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.4rem, 4vw, 2rem);
}

.hero p { color: var(--muted); margin: 6px 0 0; }

.panel {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  box-shadow: 0 8px 26px rgba(20, 33, 61, 0.06);
}

.dropzone {
  border: 2px dashed #d1a45a;
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  position: relative;
  background: #fffdf7;
  transition: transform 180ms ease, background 180ms ease;
}

.dropzone.dragover {
  transform: translateY(-2px);
  background: #fffbef;
}

#pdfInput {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

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

.btn {
  border: 0;
  border-radius: 10px;
  padding: 10px 14px;
  background: var(--accent-2);
  color: #fff;
  cursor: pointer;
}

.btn.secondary { background: var(--accent); }
.btn.ghost { background: #fff; color: var(--ink); border: 1px solid var(--border); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.feedback { min-height: 1.2rem; }
.muted { color: var(--muted); font-size: 0.92rem; }

.status-line {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 0.95rem;
  margin-bottom: 10px;
}

.chat-log {
  min-height: 180px;
  max-height: 360px;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px;
  background: #fffdf9;
}

.msg { margin: 8px 0; }
.msg.user { color: #0f172a; }
.msg.assistant { color: #1f2937; }

.chat-input-row {
  margin-top: 10px;
  display: grid;
  gap: 8px;
}

textarea {
  width: 100%;
  resize: vertical;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  font: inherit;
}

.citations {
  margin: 8px 0 0;
  padding-left: 18px;
}

.citations li { margin: 4px 0; }

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

@media (max-width: 640px) {
  .panel { padding: 12px; }
}