/* ── Reset & base ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --header-h:   48px;
  --chat-w:     30%;
  --bg:         #f4f5f7;
  --surface:    #ffffff;
  --border:     #d0d3d9;
  --accent:     #1a56a0;
  --accent-dk:  #134080;
  --text:       #1a1c1e;
  --text-muted: #6b7280;
  --bubble-user:#e8f0fb;
  --bubble-ai:  #f0f4f8;
  --danger:     #c0392b;
  --radius:     6px;
  --shadow:     0 1px 4px rgba(0,0,0,.12);
}

html, body { height: 100%; font-family: system-ui, sans-serif; background: var(--bg); color: var(--text); }

/* ── Login ────────────────────────────────────────────────────────────────── */
#login-overlay {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #0f2744 0%, #1a56a0 100%);
  z-index: 100;
}
#login-box {
  background: var(--surface);
  border-radius: 10px;
  padding: 2.5rem 2rem;
  width: 360px;
  box-shadow: 0 8px 32px rgba(0,0,0,.3);
  text-align: center;
}
#login-box h1 { color: var(--accent); font-size: 1.6rem; margin-bottom: .25rem; }
#login-box p  { color: var(--text-muted); font-size: .9rem; margin-bottom: 1.5rem; }
#login-form, #newpass-form { display: flex; flex-direction: column; gap: .75rem; }
#login-box input {
  padding: .6rem .8rem; border: 1px solid var(--border);
  border-radius: var(--radius); font-size: .95rem;
}
#login-box input:focus { outline: 2px solid var(--accent); border-color: var(--accent); }
#login-box button {
  padding: .7rem; background: var(--accent); color: #fff;
  border: none; border-radius: var(--radius); font-size: 1rem;
  cursor: pointer; transition: background .15s;
}
#login-box button:hover { background: var(--accent-dk); }
.error-msg { color: var(--danger); font-size: .85rem; min-height: 1.2em; }
.hint { color: var(--text-muted); font-size: .85rem; }

/* ── App shell ────────────────────────────────────────────────────────────── */
#app { display: flex; flex-direction: column; height: 100vh; }

#app-header {
  height: var(--header-h);
  background: var(--accent); color: #fff;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 1rem;
  box-shadow: var(--shadow);
  flex-shrink: 0;
}
#app-title { font-size: 1.1rem; font-weight: 600; letter-spacing: .02em; }
#logout-btn {
  background: rgba(255,255,255,.15); border: 1px solid rgba(255,255,255,.4);
  color: #fff; padding: .3rem .8rem; border-radius: var(--radius);
  cursor: pointer; font-size: .85rem;
}
#logout-btn:hover { background: rgba(255,255,255,.25); }

#app-main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ── Chat panel ───────────────────────────────────────────────────────────── */
#chat-panel {
  width: var(--chat-w);
  min-width: 240px;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  background: var(--surface);
}

#catalog-row {
  padding: .6rem .75rem;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: .5rem;
  flex-shrink: 0;
}
#catalog-row label { font-size: .8rem; color: var(--text-muted); white-space: nowrap; }
#catalog-select {
  flex: 1; padding: .35rem .5rem;
  border: 1px solid var(--border); border-radius: var(--radius);
  font-size: .85rem; background: var(--surface);
}

#chat-history {
  flex: 1;
  overflow-y: auto;
  padding: .75rem;
  display: flex;
  flex-direction: column;
  gap: .6rem;
}

/* Chat bubbles */
.bubble {
  padding: .55rem .75rem;
  border-radius: var(--radius);
  font-size: .88rem;
  line-height: 1.45;
  max-width: 100%;
  word-break: break-word;
}
.bubble-user {
  background: var(--bubble-user);
  align-self: flex-end;
  border-bottom-right-radius: 2px;
}
.bubble-ai {
  background: var(--bubble-ai);
  border: 1px solid var(--border);
  border-bottom-left-radius: 2px;
}
.bubble-ai.thinking { color: var(--text-muted); font-style: italic; }

/* Column of pills beneath an AI answer */
.meta-row {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  margin-top: .55rem;
  align-items: flex-start;
}

/* Page jump pill */
.page-ref {
  display: inline-block;
  padding: .2rem .65rem;
  border-radius: 20px;
  font-size: .78rem;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  background: rgba(26,86,160,.1);
  color: var(--accent);
  border: 1px solid rgba(26,86,160,.3);
  transition: background .15s;
}
.page-ref:hover { background: rgba(26,86,160,.2); }

/* Part number search pills — stacked in a column */
.part-link {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .2rem .65rem;
  border-radius: 20px;
  font-size: .78rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  background: var(--surface);
  color: var(--accent);
  border: 1px solid rgba(26,86,160,.25);
  transition: background .15s, border-color .15s;
}
.part-link:hover {
  background: rgba(26,86,160,.1);
  border-color: var(--accent);
}
.part-prefix {
  font-size: .7rem;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: .03em;
}

#input-area {
  padding: .6rem .75rem;
  border-top: 1px solid var(--border);
  display: flex;
  gap: .5rem;
  flex-shrink: 0;
}
#question-input {
  flex: 1;
  padding: .45rem .6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: .88rem;
  resize: none;
  font-family: inherit;
  line-height: 1.4;
}
#question-input:focus { outline: 2px solid var(--accent); border-color: var(--accent); }
#submit-btn {
  padding: .45rem .9rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: .88rem;
  cursor: pointer;
  white-space: nowrap;
  align-self: flex-end;
  transition: background .15s;
}
#submit-btn:hover:not(:disabled) { background: var(--accent-dk); }
#submit-btn:disabled, #question-input:disabled { opacity: .5; cursor: not-allowed; }

/* ── Viewer panel ─────────────────────────────────────────────────────────── */
#viewer-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: #6b7280;
}

#viewer-toolbar {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: .5rem .75rem;
  background: #374151;
  color: #e5e7eb;
  flex-shrink: 0;
}
#viewer-toolbar button {
  background: #4b5563;
  border: 1px solid #6b7280;
  color: #e5e7eb;
  border-radius: var(--radius);
  padding: 0 1rem;
  cursor: pointer;
  font-size: 1rem;
  min-width: 44px;
  min-height: 44px;
  transition: background .15s;
}
#viewer-toolbar button:hover:not(:disabled) { background: #6b7280; }
#viewer-toolbar button:disabled { opacity: .4; cursor: not-allowed; }

/* Page slider — wide, easy to grab */
#page-slider {
  flex: 1;
  min-width: 80px;
  height: 6px;
  cursor: pointer;
  accent-color: var(--accent);
}
#page-slider:disabled { opacity: .35; cursor: not-allowed; }
#page-slider::-webkit-slider-thumb { width: 28px; height: 28px; }
#page-slider::-moz-range-thumb     { width: 28px; height: 28px; border: none; }

#page-indicator { font-size: .95rem; min-width: 90px; text-align: center; white-space: nowrap; }

#pdf-container {
  flex: 1;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
}
#pdf-spread {
  display: flex;
  align-items: center;
  justify-content: center;
}
#pdf-spread canvas {
  display: block;
  box-shadow: 0 4px 20px rgba(0,0,0,.5);
  background: #fff;
}
#pdf-placeholder {
  display: none;
  color: #d1d5db;
  font-size: 1.1rem;
  margin: auto;
}

/* ── Print ────────────────────────────────────────────────────────────────── */
#print-surface { display: none; }

@media print {
  body > * { display: none !important; }
  #print-surface {
    display: block !important;
    text-align: center;
  }
  #print-surface canvas { max-width: 100%; height: auto; }
}