/* VBS Engine UI — palette pulled from logo (banner #243F92, wings #C32830) */
:root {
  --vbs-blue:        #243F92;
  --vbs-blue-deep:   #182C6E;
  --vbs-blue-ink:    #0F1E47;
  --vbs-red:         #C32830;
  --vbs-red-deep:    #9C1E25;

  --bg:              #F7F8FB;
  --surface:         #FFFFFF;
  --fg:              #1A1A1A;
  --muted:           #6A6A6A;
  --border:          #E2E2E2;
  --border-strong:   #C8CDDA;

  --accent:          var(--vbs-blue);
  --accent-deep:     var(--vbs-blue-deep);
  --danger:          var(--vbs-red);
  --danger-deep:     var(--vbs-red-deep);

  --warn-bg:         #FFF5B1;
  --warn-fg:         #855A00;
  --danger-bg:       #FED7D7;
  --danger-fg:       #742A2A;
  --ok-bg:           #D4EDDA;
  --ok-fg:           #155724;

  --max-w:           1280px;
  --radius:          8px;
  --radius-sm:       4px;
  --shadow-sm:       0 1px 2px rgba(15, 30, 71, 0.06);
  --shadow:          0 4px 16px rgba(15, 30, 71, 0.08);

  --sidebar-w:       288px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.5;
}

a { color: var(--accent); }
a:hover { color: var(--accent-deep); }

main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 24px;
}

/* main can be full-bleed when chat takes over the viewport */
main.full-bleed {
  max-width: none;
  margin: 0;
  padding: 0;
}

/* ---------- top nav ---------- */
.topnav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.topnav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 10px 24px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.topnav .brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--vbs-blue-ink);
  font-weight: 700;
  letter-spacing: -0.01em;
  flex-shrink: 0;
}
.topnav .brand img {
  height: 36px;
  width: auto;
  display: block;
}
.topnav .brand .wordmark {
  font-size: 15px;
  color: var(--muted);
  font-weight: 500;
  border-left: 1px solid var(--border);
  padding-left: 12px;
}
.topnav .tabs {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}
.topnav .tabs a {
  color: var(--fg);
  text-decoration: none;
  padding: 8px 14px;
  border-radius: 6px;
  font-weight: 500;
  font-size: 14.5px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.topnav .tabs a:hover { background: rgba(36, 63, 146, 0.06); color: var(--vbs-blue); }
.topnav .tabs a.active {
  background: rgba(36, 63, 146, 0.10);
  color: var(--vbs-blue);
}
.topnav .tabs .badge {
  background: var(--vbs-red);
  color: #fff;
  border-radius: 999px;
  padding: 1px 8px;
  font-size: 11px;
  font-weight: 600;
}
.topnav .user-block {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
}
.topnav .user {
  color: var(--muted);
  font-size: 13.5px;
}

/* ---------- buttons ---------- */
button, .btn {
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  font-size: 14.5px;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  font-family: inherit;
}
button:hover, .btn:hover { background: var(--accent-deep); }
button.danger, .btn.danger { background: var(--danger); }
button.danger:hover, .btn.danger:hover { background: var(--danger-deep); }
button.primary, .btn.primary { background: #2F855A; }
button.primary:hover, .btn.primary:hover { background: #276749; }
button.ghost, .btn.ghost {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--border-strong);
}
button.ghost:hover, .btn.ghost:hover {
  background: rgba(36, 63, 146, 0.04);
  border-color: var(--vbs-blue);
  color: var(--vbs-blue);
}
button.link {
  background: none;
  border: 0;
  color: var(--accent);
  cursor: pointer;
  padding: 0;
  font: inherit;
}
button.link:hover { color: var(--accent-deep); background: none; }
form.inline { display: inline; margin: 0; }

/* ---------- flash messages ---------- */
.flash { list-style: none; padding: 0; margin: 0 0 16px 0; }
.flash li {
  padding: 10px 14px;
  border-radius: 6px;
  margin-bottom: 6px;
}
.flash-info { background: #E6F0FB; color: var(--vbs-blue-ink); }
.flash-error { background: var(--danger-bg); color: var(--danger-fg); }

/* ---------- auth ---------- */
.auth-shell {
  min-height: calc(100vh - 80px);
  display: grid;
  place-items: center;
  padding: 24px;
}
.auth-card {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 32px;
  border-radius: var(--radius);
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow);
}
.auth-card .hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  text-align: center;
}
.auth-card .hero img {
  height: 96px;
  width: auto;
}
.auth-card h1 {
  margin: 0;
  font-size: 22px;
  color: var(--vbs-blue-ink);
}
.auth-card .hero p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}
.auth-card label {
  display: block;
  margin-bottom: 14px;
  font-size: 14px;
  color: var(--fg);
  font-weight: 500;
}
.auth-card input[type="email"],
.auth-card input[type="text"],
.auth-card input[type="password"] {
  display: block;
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-size: 15px;
  margin-top: 6px;
  font-family: inherit;
}
.auth-card input:focus {
  outline: 2px solid rgba(36, 63, 146, 0.25);
  border-color: var(--vbs-blue);
}
.auth-card button[type="submit"] {
  width: 100%;
  padding: 11px 16px;
  font-size: 15px;
  margin-top: 4px;
}

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

/* ---------- home cards ---------- */
.home h1 {
  margin: 0 0 6px 0;
  color: var(--vbs-blue-ink);
  font-size: 26px;
  letter-spacing: -0.01em;
}
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  list-style: none;
  padding: 0;
  margin-top: 18px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.card:hover:not(.disabled) {
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}
.card h2 {
  margin: 0 0 8px 0;
  font-size: 17px;
  color: var(--vbs-blue-ink);
}
.card.disabled { opacity: 0.55; }
.cta { font-weight: 600; }

/* ---------- queue / detail (invoices) ---------- */
.queue h1, .detail h1 {
  color: var(--vbs-blue-ink);
  letter-spacing: -0.01em;
}
.queue h2.vendor {
  margin-top: 28px;
  font-size: 17px;
  color: var(--vbs-blue);
  border-bottom: 2px solid var(--vbs-blue);
  padding-bottom: 6px;
}
.empty {
  padding: 32px;
  background: var(--surface);
  border: 1px dashed var(--border-strong);
  text-align: center;
  border-radius: var(--radius);
  color: var(--muted);
}
table.rows, table.line-items {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  margin-bottom: 8px;
}
table.rows th, table.line-items th {
  background: #F1F3F8;
  color: var(--vbs-blue-ink);
  text-align: left;
  padding: 10px 12px;
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border);
}
table.rows td, table.line-items td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
table.rows tbody tr:hover { background: rgba(36, 63, 146, 0.03); }
.num { text-align: right; font-variant-numeric: tabular-nums; }

.pill {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.01em;
}
.pill.warn { background: var(--warn-bg); color: var(--warn-fg); }
.pill.ok { background: var(--ok-bg); color: var(--ok-fg); }
.pill.danger { background: var(--danger-bg); color: var(--danger-fg); }
.vendor-key {
  color: var(--muted);
  font-size: 12px;
  margin-left: 6px;
}

/* ---------- detail ---------- */
.detail-grid {
  display: grid;
  grid-template-columns: minmax(360px, 1fr) minmax(400px, 1.2fr);
  gap: 24px;
}
@media (max-width: 1000px) {
  .detail-grid { grid-template-columns: 1fr; }
}
.detail-left, .detail-right {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow-sm);
}
.vendor-block h1 {
  margin: 0 0 4px 0;
  font-size: 22px;
}
#edit-form label {
  display: block;
  margin-bottom: 12px;
  font-size: 14px;
  font-weight: 500;
}
#edit-form input {
  display: block;
  margin-top: 4px;
  padding: 7px 10px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: inherit;
}
#edit-form input:focus {
  outline: 2px solid rgba(36, 63, 146, 0.25);
  border-color: var(--vbs-blue);
}
.actions {
  display: flex;
  gap: 10px;
  margin-top: 18px;
}
.reject-block {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}
.reject-block textarea {
  display: block;
  width: 100%;
  margin-top: 4px;
  padding: 8px 10px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: inherit;
}
.pdf-fallback { margin: 0 0 10px 0; }
.pdf-frame {
  width: 100%;
  height: 90vh;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.pdf-missing {
  padding: 32px;
  text-align: center;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-sm);
}

/* ---------- approved ---------- */
.approved .banner.phase4-pending {
  background: var(--ok-bg);
  color: var(--ok-fg);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin: 16px 0;
}
.summary {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 4px 16px;
  background: var(--surface);
  padding: 16px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.summary dt { color: var(--muted); }
.summary dd { margin: 0; }

/* =========================================================
   Chat surface — sidebar + thread view
   ========================================================= */
.chat-shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  height: calc(100vh - 57px);  /* topnav height */
  background: var(--bg);
}

.chat-sidebar {
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.chat-sidebar .new-chat {
  margin: 12px;
}
.chat-sidebar .new-chat .btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 9px 12px;
  font-size: 14px;
  background: var(--vbs-blue);
}
.chat-sidebar .new-chat .btn:hover { background: var(--accent-deep); }

.thread-list {
  list-style: none;
  padding: 0 8px 16px 8px;
  margin: 0;
  overflow-y: auto;
  flex: 1;
}
.thread-list .group-label {
  font-size: 11.5px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 14px 10px 4px 10px;
}
.thread-list li.thread {
  position: relative;
  display: flex;
  align-items: center;
  padding: 8px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  color: var(--fg);
  gap: 6px;
}
.thread-list li.thread:hover { background: rgba(36, 63, 146, 0.06); }
.thread-list li.thread.active {
  background: rgba(36, 63, 146, 0.10);
  color: var(--vbs-blue);
  font-weight: 500;
}
.thread-list li.thread a {
  color: inherit;
  text-decoration: none;
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.thread-list li.thread .menu-btn {
  background: none;
  border: 0;
  color: var(--muted);
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 18px;
  line-height: 1;
  opacity: 0;
  transition: opacity 0.1s;
}
.thread-list li.thread:hover .menu-btn,
.thread-list li.thread.active .menu-btn { opacity: 1; }
.thread-list li.thread .menu-btn:hover { background: rgba(0,0,0,0.06); color: var(--fg); }

.thread-menu {
  position: absolute;
  right: 6px;
  top: 32px;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  box-shadow: var(--shadow);
  z-index: 20;
  min-width: 140px;
  padding: 4px;
  display: none;
}
.thread-menu.open { display: block; }
.thread-menu button {
  display: block;
  width: 100%;
  text-align: left;
  background: none;
  border: 0;
  color: var(--fg);
  padding: 7px 10px;
  font-size: 13.5px;
  border-radius: 4px;
  cursor: pointer;
}
.thread-menu button:hover { background: rgba(36, 63, 146, 0.06); color: var(--vbs-blue); }
.thread-menu button.danger-item { color: var(--vbs-red); }
.thread-menu button.danger-item:hover { background: rgba(195, 40, 48, 0.06); }

.sidebar-footer {
  border-top: 1px solid var(--border);
  padding: 10px 12px;
  font-size: 12px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
}

/* ---------- thread view (right pane) ---------- */
.chat-main {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}
.chat-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.chat-header .title {
  font-weight: 600;
  font-size: 15px;
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--vbs-blue-ink);
}
.chat-header .model-selector {
  font-size: 13px;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 6px;
}
.chat-header select {
  border: 1px solid var(--border-strong);
  background: var(--surface);
  border-radius: 6px;
  padding: 4px 8px;
  font: inherit;
  font-size: 13px;
  color: var(--fg);
  cursor: pointer;
}

.chat-thread {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  background: var(--bg);
}
.chat-thread .empty-state {
  margin: auto;
  text-align: center;
  color: var(--muted);
  max-width: 460px;
}
.chat-thread .empty-state img {
  height: 96px;
  width: auto;
  opacity: 0.85;
  margin-bottom: 16px;
}
.chat-thread .empty-state h2 {
  color: var(--vbs-blue-ink);
  font-size: 22px;
  margin: 0 0 6px 0;
  letter-spacing: -0.01em;
}
.chat-thread .empty-state p { margin: 0; font-size: 14.5px; }
.chat-thread .empty-state .suggestions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 22px;
}
.chat-thread .empty-state .suggestion {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  text-align: left;
  font-size: 13.5px;
  color: var(--fg);
  cursor: pointer;
  transition: all 0.1s;
  font-family: inherit;
}
.chat-thread .empty-state .suggestion:hover {
  border-color: var(--vbs-blue);
  background: rgba(36, 63, 146, 0.04);
  color: var(--vbs-blue);
}

.message {
  display: flex;
  gap: 12px;
  max-width: 800px;
  width: 100%;
  margin: 0 auto;
}
.message .avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  font-weight: 600;
  font-size: 12px;
  color: #fff;
  letter-spacing: 0.02em;
}
.message.user .avatar { background: var(--vbs-blue); }
.message.assistant .avatar { background: var(--vbs-red); }
.message .body {
  flex: 1;
  padding-top: 4px;
  min-width: 0;
}
.message .who {
  font-weight: 600;
  font-size: 13.5px;
  color: var(--vbs-blue-ink);
  margin-bottom: 4px;
}
.message.assistant .who { color: var(--vbs-red-deep); }
.message .content {
  font-size: 15px;
  line-height: 1.55;
  white-space: pre-wrap;
  word-wrap: break-word;
}
.message .timestamp {
  font-size: 11.5px;
  color: var(--muted);
  margin-top: 6px;
}

.composer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  padding: 16px 24px;
}
.composer-inner {
  max-width: 800px;
  margin: 0 auto;
}
.composer form {
  display: flex;
  gap: 10px;
  align-items: flex-end;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 8px 8px 8px 14px;
  transition: border-color 0.1s;
}
.composer form:focus-within {
  border-color: var(--vbs-blue);
  box-shadow: 0 0 0 3px rgba(36, 63, 146, 0.10);
}
.composer textarea {
  flex: 1;
  resize: none;
  border: 0;
  outline: 0;
  font: inherit;
  font-size: 15px;
  padding: 8px 0;
  background: transparent;
  color: var(--fg);
  max-height: 200px;
  min-height: 24px;
  line-height: 1.5;
}
.composer button.send {
  background: var(--vbs-blue);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  padding: 0;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}
.composer button.send:disabled {
  background: var(--border-strong);
  cursor: not-allowed;
}
.composer-hint {
  font-size: 11.5px;
  color: var(--muted);
  text-align: center;
  margin-top: 8px;
}

/* ---------- mobile ---------- */
@media (max-width: 768px) {
  .chat-shell {
    grid-template-columns: 1fr;
  }
  .chat-sidebar {
    position: fixed;
    inset: 57px 0 0 0;
    width: 100%;
    z-index: 30;
    transform: translateX(-100%);
    transition: transform 0.2s;
  }
  .chat-sidebar.open { transform: translateX(0); }
  .topnav .tabs { display: none; }
  .topnav .user-block .user { display: none; }
}
.sidebar-toggle {
  display: none;
  background: none;
  border: 0;
  color: var(--fg);
  font-size: 22px;
  cursor: pointer;
  padding: 0 4px;
}
@media (max-width: 768px) {
  .sidebar-toggle { display: inline-block; }
}