/* ==============================================================
   WLJ Forensic Copilot — App Styles
   ChatGPT/OpenWebUI inspired, dark theme.
   ============================================================== */

/* --- Layout shell --------------------------------------------- */
.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  height: 100vh;
  overflow: hidden;
}

/* --- Sidebar --------------------------------------------------- */
.sidebar {
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  min-width: 0;
  transition: transform var(--t-base);
}

.sidebar__header {
  padding: var(--space-4) var(--space-4) var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  border-bottom: 1px solid var(--border);
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 600;
  font-size: var(--fs-15);
  letter-spacing: 0.2px;
}
.brand__logo {
  font-size: var(--fs-20);
  filter: drop-shadow(0 0 6px rgba(56, 189, 248, 0.4));
}
.brand__sub {
  display: block;
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  font-weight: 500;
}

.sidebar__toggle {
  margin-left: auto;
  color: var(--muted);
  padding: 4px 6px;
  border-radius: var(--r-sm);
  font-size: var(--fs-16);
  transition: background var(--t-fast), color var(--t-fast);
}
.sidebar__toggle:hover { background: var(--panel-hover); color: var(--text); }

.sidebar__body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-3) var(--space-3) var(--space-2);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.sidebar__newcase {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  width: 100%;
  padding: 10px 12px;
  border: 1px dashed var(--border-strong);
  border-radius: var(--r-md);
  color: var(--text);
  font-size: var(--fs-13);
  font-weight: 500;
  background: rgba(56, 189, 248, 0.04);
  transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast);
}
.sidebar__newcase:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.sidebar__section-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--muted);
  font-weight: 600;
  padding: var(--space-2) var(--space-2) 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.case-list { display: flex; flex-direction: column; gap: 2px; }
.case-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 10px;
  border-radius: var(--r-md);
  cursor: pointer;
  border: 1px solid transparent;
  transition: background var(--t-fast), border-color var(--t-fast);
  user-select: none;
}
.case-item:hover { background: var(--panel-hover); }
.case-item.is-active {
  background: var(--accent-soft);
  border-color: var(--accent-dark);
}
.case-item__name {
  font-size: var(--fs-13);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.case-item__meta {
  font-size: 11px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.history-list { display: flex; flex-direction: column; gap: 2px; }
.history-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: var(--r-sm);
  font-size: var(--fs-13);
  color: var(--text-soft);
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.history-item:hover { background: var(--panel-hover); color: var(--text); }
.history-item.is-active { background: var(--accent-soft); color: var(--accent); }
.history-item__icon { color: var(--muted); flex-shrink: 0; }

.empty-hint {
  color: var(--muted);
  font-size: var(--fs-12);
  padding: var(--space-2) var(--space-3);
  font-style: italic;
}

.sidebar__footer {
  border-top: 1px solid var(--border);
  padding: var(--space-3);
}

.user-card {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 8px 10px;
  border-radius: var(--r-md);
  cursor: pointer;
  transition: background var(--t-fast);
}
.user-card:hover { background: var(--panel-hover); }
.user-card__avatar {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: var(--fs-13);
  color: white;
  flex-shrink: 0;
}
.user-card__info { flex: 1; min-width: 0; }
.user-card__name { font-size: var(--fs-13); font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.user-card__email { font-size: 11px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.user-card__caret { color: var(--muted); font-size: 14px; }

.user-menu {
  position: absolute;
  bottom: calc(100% + 6px);
  left: 0;
  right: 0;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-lg);
  padding: 4px;
  display: none;
  z-index: 50;
}
.user-menu.is-open { display: block; }
.user-menu__item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  padding: 8px 10px;
  border-radius: var(--r-sm);
  font-size: var(--fs-13);
  color: var(--text);
  text-align: left;
  transition: background var(--t-fast);
}
.user-menu__item:hover { background: var(--panel-hover); }
.user-menu__item.is-danger { color: var(--danger); }
.user-menu__item.is-danger:hover { background: rgba(239, 68, 68, 0.1); }

/* --- Main column ---------------------------------------------- */
.main {
  display: flex;
  flex-direction: column;
  background: var(--bg);
  min-width: 0;
  height: 100vh;
}

.topbar {
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0 var(--space-5);
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  flex-shrink: 0;
}

.topbar__sidebar-toggle {
  display: none;
  color: var(--muted);
  font-size: var(--fs-18);
  padding: 4px 8px;
}

.topbar__case {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.topbar__case-name {
  font-size: var(--fs-14);
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.topbar__case-sub {
  font-size: 11px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar__actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: var(--r-md);
  color: var(--text-soft);
  font-size: var(--fs-13);
  font-weight: 500;
  border: 1px solid transparent;
  background: rgba(255, 255, 255, 0.02);
  transition: background var(--t-fast), color var(--t-fast), border-color var(--t-fast);
}
.icon-btn:hover { background: var(--panel-hover); color: var(--text); border-color: var(--border); }
.icon-btn:disabled {
  opacity: 0.4;
  pointer-events: none;
}
.icon-btn__label { display: inline; }

/* --- Chat area ------------------------------------------------ */
.chat {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

.messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-6) var(--space-5);
  scroll-behavior: smooth;
  background: linear-gradient(180deg, var(--bg), var(--bg-elev));
}

.messages__inner {
  max-width: 880px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.bubble {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--r-lg);
  word-wrap: break-word;
  overflow-wrap: anywhere;
  animation: bubble-in 0.18s ease-out;
}
@keyframes bubble-in {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.bubble.is-user {
  background: linear-gradient(180deg, var(--accent-dark), #036aa6);
  color: white;
  align-self: flex-end;
  max-width: 75%;
  border-bottom-right-radius: 4px;
  white-space: pre-wrap;
}

.bubble.is-assistant {
  background: var(--panel);
  border: 1px solid var(--border);
  align-self: stretch;
  max-width: 100%;
  border-bottom-left-radius: 4px;
}

.bubble.is-system {
  background: transparent;
  border: 1px dashed var(--border);
  color: var(--muted);
  text-align: center;
  font-size: var(--fs-12);
  align-self: center;
  max-width: 60%;
  padding: 8px 14px;
  font-style: italic;
}

.bubble.is-error {
  border-color: var(--danger);
  color: #fca5a5;
  background: rgba(239, 68, 68, 0.08);
}

.bubble__role {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted);
  margin-bottom: 6px;
  font-weight: 600;
}
.bubble__role-icon {
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--accent-soft);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 11px;
}

/* --- Status track --------------------------------------------- */
.status-track {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: var(--space-3);
  padding: var(--space-3);
  background: rgba(56, 189, 248, 0.05);
  border: 1px solid rgba(56, 189, 248, 0.15);
  border-radius: var(--r-md);
  font-size: var(--fs-12);
}
.status-track__step {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  transition: color var(--t-base);
}
.status-track__dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--muted-2);
  flex-shrink: 0;
  position: relative;
}
.status-track__step.is-active {
  color: var(--text);
}
.status-track__step.is-active .status-track__dot {
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
  animation: pulse-dot 1.2s infinite;
}
.status-track__step.is-done {
  color: var(--text-soft);
}
.status-track__step.is-done .status-track__dot {
  background: var(--success);
  box-shadow: 0 0 6px rgba(34, 197, 94, 0.5);
}
.status-track__step.is-error .status-track__dot {
  background: var(--danger);
  box-shadow: 0 0 6px rgba(239, 68, 68, 0.6);
}
@keyframes pulse-dot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.5); opacity: 0.6; }
}

.streaming-cursor {
  display: inline-block;
  width: 8px; height: 14px;
  background: var(--accent);
  margin-left: 2px;
  vertical-align: text-bottom;
  animation: blink 0.9s infinite;
}
@keyframes blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

/* --- Markdown content ----------------------------------------- */
.md > :first-child { margin-top: 0; }
.md > :last-child { margin-bottom: 0; }
.md h1, .md h2, .md h3, .md h4 {
  margin: 14px 0 8px;
  color: var(--accent);
  line-height: 1.3;
  font-weight: 600;
}
.md h1 { font-size: var(--fs-18); border-bottom: 1px solid var(--border); padding-bottom: 4px; }
.md h2 { font-size: var(--fs-16); }
.md h3 { font-size: var(--fs-15); color: #93c5fd; }
.md h4 { font-size: var(--fs-14); color: var(--text-soft); }
.md p { margin: 8px 0; }
.md ul, .md ol { margin: 8px 0; padding-left: 22px; }
.md li { margin: 4px 0; }
.md strong { color: #fde68a; font-weight: 600; }
.md em { color: #c4b5fd; }
.md code {
  background: rgba(0, 0, 0, 0.4);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: #fbbf24;
}
.md pre {
  background: rgba(0, 0, 0, 0.45);
  padding: 12px;
  border-radius: var(--r-md);
  overflow-x: auto;
  font-size: var(--fs-12);
  border: 1px solid var(--border);
  margin: 10px 0;
}
.md pre code { background: transparent; padding: 0; color: var(--text); }
.md blockquote {
  border-left: 3px solid var(--accent);
  margin: 10px 0;
  padding: 4px 12px;
  background: var(--accent-soft);
  color: var(--text-soft);
  font-style: italic;
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
}
.md table {
  border-collapse: collapse;
  margin: 10px 0;
  width: 100%;
  font-size: var(--fs-13);
  display: block;
  overflow-x: auto;
}
.md th, .md td {
  border: 1px solid var(--border);
  padding: 6px 10px;
  text-align: left;
}
.md th {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
  white-space: nowrap;
}
.md hr { border: none; border-top: 1px solid var(--border); margin: 14px 0; }
.md a { color: var(--accent); text-decoration: underline; }

/* --- Empty state ---------------------------------------------- */
.empty-state {
  text-align: center;
  padding: 80px 20px 40px;
  color: var(--muted);
  max-width: 640px;
  margin: 0 auto;
}
.empty-state__icon {
  font-size: 56px;
  margin-bottom: var(--space-3);
  filter: drop-shadow(0 4px 18px rgba(56, 189, 248, 0.35));
}
.empty-state__title {
  font-size: var(--fs-20);
  color: var(--text);
  margin-bottom: var(--space-2);
  font-weight: 600;
}
.empty-state__hint { font-size: var(--fs-14); line-height: 1.6; }

/* --- Suggestion chips ---------------------------------------- */
.suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: var(--space-3) var(--space-5) 0;
  max-width: 880px;
  margin: 0 auto;
  width: 100%;
}
.suggestions__chip {
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid var(--accent-dark);
  color: var(--accent);
  padding: 6px 12px;
  border-radius: var(--r-pill);
  font-size: var(--fs-12);
  cursor: pointer;
  transition: background var(--t-fast), transform var(--t-fast);
}
.suggestions__chip:hover {
  background: rgba(56, 189, 248, 0.18);
  transform: translateY(-1px);
}

/* --- Composer ------------------------------------------------- */
.composer {
  border-top: 1px solid var(--border);
  background: var(--panel);
  padding: var(--space-3) var(--space-5);
  flex-shrink: 0;
}
.composer__inner {
  max-width: 880px;
  margin: 0 auto;
  display: flex;
  align-items: flex-end;
  gap: var(--space-2);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 6px 8px;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.composer__inner:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.composer__textarea {
  flex: 1;
  background: transparent;
  border: none;
  resize: none;
  color: var(--text);
  padding: 8px 6px;
  font-size: var(--fs-14);
  line-height: 1.5;
  max-height: 200px;
  min-height: 24px;
}
.composer__send {
  width: 36px; height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-md);
  background: var(--accent-dark);
  color: white;
  font-size: var(--fs-16);
  transition: background var(--t-fast);
  flex-shrink: 0;
}
.composer__send:hover:not(:disabled) { background: var(--accent); }
.composer__send.is-stopping {
  background: var(--danger);
}
.composer__send.is-stopping:hover { background: #dc2626; }
.composer__send:disabled { background: var(--panel-hover); color: var(--muted); }
.composer__hint {
  max-width: 880px;
  margin: 6px auto 0;
  text-align: center;
  font-size: 11px;
  color: var(--muted-2);
}

/* --- Timeline cards ------------------------------------------- */
.timeline {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-2);
}
.timeline__header {
  font-weight: 600;
  color: var(--accent);
  margin-bottom: var(--space-2);
  font-size: var(--fs-14);
}
.tl-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--r-md);
  padding: 10px 14px;
  font-size: var(--fs-13);
}
.tl-card__row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 4px;
}
.tl-card__ts {
  color: var(--accent);
  font-weight: 600;
  font-size: var(--fs-12);
  font-family: var(--font-mono);
}
.tl-card__actor {
  color: var(--warning);
  font-weight: 600;
}
.tl-card__cat {
  display: inline-block;
  padding: 2px 8px;
  border-radius: var(--r-pill);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-soft);
  font-weight: 600;
}
.tl-card__cat.is-financial { background: rgba(34, 197, 94, 0.15); color: #86efac; }
.tl-card__cat.is-meeting { background: rgba(245, 158, 11, 0.15); color: #fcd34d; }
.tl-card__cat.is-evidence { background: rgba(56, 189, 248, 0.15); color: #7dd3fc; }
.tl-card__cat.is-modus { background: rgba(239, 68, 68, 0.15); color: #fca5a5; }
.tl-card__cat.is-network { background: rgba(167, 139, 250, 0.15); color: #c4b5fd; }
.tl-card__action { color: var(--text); margin: 4px 0; }
.tl-card__quote {
  color: var(--muted);
  font-style: italic;
  font-size: var(--fs-12);
  margin-top: 6px;
  border-left: 2px solid var(--border-strong);
  padding-left: 8px;
}

/* --- Modal ---------------------------------------------------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  animation: fade-in 0.12s ease-out;
  padding: var(--space-4);
}
@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }

.modal {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  animation: modal-in 0.18s cubic-bezier(0.2, 1, 0.3, 1);
}
@keyframes modal-in {
  from { opacity: 0; transform: translateY(10px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.modal__header {
  padding: var(--space-4);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.modal__title {
  font-size: var(--fs-15);
  font-weight: 600;
}
.modal__close {
  color: var(--muted);
  font-size: var(--fs-18);
  padding: 4px 8px;
  border-radius: var(--r-sm);
  transition: background var(--t-fast), color var(--t-fast);
}
.modal__close:hover { background: var(--panel-hover); color: var(--text); }
.modal__body {
  padding: var(--space-4);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.modal__footer {
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
}

.field { display: flex; flex-direction: column; gap: 6px; }
.field__label {
  font-size: var(--fs-12);
  color: var(--muted);
  font-weight: 600;
  letter-spacing: 0.3px;
  text-transform: uppercase;
}
.field__input,
.field__select,
.field__textarea {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 12px;
  border-radius: var(--r-md);
  font-size: var(--fs-14);
  width: 100%;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.field__input:focus,
.field__select:focus,
.field__textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.field__textarea { resize: vertical; min-height: 80px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--r-md);
  font-size: var(--fs-13);
  font-weight: 600;
  border: 1px solid transparent;
  background: var(--accent-dark);
  color: white;
  transition: background var(--t-fast), opacity var(--t-fast);
}
.btn:hover:not(:disabled) { background: var(--accent); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn.is-secondary {
  background: transparent;
  border-color: var(--border);
  color: var(--text-soft);
}
.btn.is-secondary:hover:not(:disabled) { background: var(--panel-hover); color: var(--text); }
.btn.is-danger { background: var(--danger); }
.btn.is-danger:hover:not(:disabled) { background: #dc2626; }

.btn .spinner {
  width: 14px; height: 14px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* --- Dropzone ------------------------------------------------- */
.dropzone {
  border: 2px dashed var(--border-strong);
  border-radius: var(--r-md);
  padding: var(--space-6);
  text-align: center;
  cursor: pointer;
  transition: border-color var(--t-fast), background var(--t-fast);
}
.dropzone:hover, .dropzone.is-dragover {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.dropzone__icon { font-size: 36px; margin-bottom: var(--space-2); }
.dropzone__title { color: var(--text); font-weight: 600; margin-bottom: 4px; }
.dropzone__sub { color: var(--muted); font-size: var(--fs-12); }
.dropzone__file {
  margin-top: var(--space-3);
  padding: 8px 12px;
  background: var(--panel-hover);
  border-radius: var(--r-sm);
  font-size: var(--fs-13);
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}
.dropzone__file-icon { color: var(--accent); }

/* --- Toast --------------------------------------------------- */
.toast-host {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}
.toast {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--r-md);
  padding: 10px 14px;
  min-width: 240px;
  max-width: 360px;
  font-size: var(--fs-13);
  color: var(--text);
  box-shadow: var(--shadow-md);
  pointer-events: auto;
  animation: toast-in 0.18s ease-out;
}
.toast.is-success { border-left-color: var(--success); }
.toast.is-warning { border-left-color: var(--warning); }
.toast.is-error { border-left-color: var(--danger); }
@keyframes toast-in {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}

/* --- Banner --------------------------------------------------- */
.banner {
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.4);
  color: #fcd34d;
  padding: 8px 14px;
  border-radius: var(--r-md);
  font-size: var(--fs-12);
  margin-bottom: var(--space-3);
}

/* --- Mobile / responsive ------------------------------------- */
.sidebar__backdrop {
  display: none;
}

@media (max-width: 880px) {
  .icon-btn__label { display: none; }
}

@media (max-width: 720px) {
  .app {
    grid-template-columns: 1fr;
  }
  .sidebar {
    position: fixed;
    top: 0; bottom: 0; left: 0;
    width: 280px;
    z-index: 80;
    transform: translateX(-100%);
    box-shadow: var(--shadow-lg);
  }
  .sidebar.is-open {
    transform: translateX(0);
  }
  .sidebar__backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 70;
    display: none;
  }
  .sidebar.is-open ~ .sidebar__backdrop {
    display: block;
  }
  .topbar__sidebar-toggle {
    display: inline-flex;
  }
  .messages, .composer, .suggestions {
    padding-left: var(--space-3);
    padding-right: var(--space-3);
  }
  .bubble.is-user { max-width: 85%; }
  .bubble.is-system { max-width: 85%; }
}

/* --- Scrollbar styling --------------------------------------- */
.messages::-webkit-scrollbar,
.sidebar__body::-webkit-scrollbar,
.modal__body::-webkit-scrollbar {
  width: 8px;
}
.messages::-webkit-scrollbar-track,
.sidebar__body::-webkit-scrollbar-track,
.modal__body::-webkit-scrollbar-track {
  background: transparent;
}
.messages::-webkit-scrollbar-thumb,
.sidebar__body::-webkit-scrollbar-thumb,
.modal__body::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}
.messages::-webkit-scrollbar-thumb:hover,
.sidebar__body::-webkit-scrollbar-thumb:hover,
.modal__body::-webkit-scrollbar-thumb:hover {
  background: var(--border-strong);
}

/* ============================================================
   File Viewer Panel
   ============================================================ */
.filepanel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 420px;
  max-width: 100vw;
  background: var(--panel);
  border-left: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.22s cubic-bezier(0.2, 1, 0.3, 1);
  z-index: 60;
}
.filepanel.is-open { transform: translateX(0); }

.filepanel__backdrop {
  position: fixed;
  inset: 0;
  background: rgba(2, 6, 16, 0.45);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s ease;
  z-index: 55;
}

.filepanel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: 12px var(--space-4);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.filepanel__title {
  font-weight: 600;
  font-size: var(--fs-14);
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.filepanel__close {
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-md);
  color: var(--muted);
  background: transparent;
  border: 1px solid transparent;
  transition: all var(--t-fast);
}
.filepanel__close:hover { background: var(--panel-hover); color: var(--text); border-color: var(--border); }

.filepanel__tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.filepanel__tab {
  flex: 1;
  padding: 10px 12px;
  font-size: var(--fs-13);
  color: var(--muted);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
  white-space: nowrap;
}
.filepanel__tab:hover { color: var(--text-soft); background: rgba(255,255,255,0.02); }
.filepanel__tab.is-active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.filepanel__body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-3) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.filepanel__empty {
  padding: var(--space-5) 0;
  text-align: center;
  color: var(--muted);
  font-size: var(--fs-13);
}
.filepanel__error {
  padding: var(--space-3);
  border-radius: var(--r-md);
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--danger);
  font-size: var(--fs-13);
}
.filepanel__meta {
  font-size: 11px;
  color: var(--muted-2);
}

.filepanel__filterbar {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.filepanel__search,
.filepanel__select {
  width: 100%;
  padding: 8px 10px;
  border-radius: var(--r-md);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: var(--fs-13);
  font-family: inherit;
}
.filepanel__search:focus,
.filepanel__select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
}

.filepanel__list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.filepanel__more {
  align-self: center;
}

/* Message item ----------------------------------------------- */
.msgitem {
  padding: 8px 10px;
  border-radius: var(--r-md);
  border: 1px solid var(--border);
  background: var(--bg-elev);
}
.msgitem__head {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 11px;
  color: var(--muted);
  margin-bottom: 4px;
}
.msgitem__sender {
  color: var(--accent);
  font-weight: 600;
  font-size: var(--fs-12);
}
.msgitem__body {
  font-size: var(--fs-13);
  color: var(--text-soft);
  line-height: 1.45;
  white-space: pre-wrap;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  cursor: pointer;
}
.msgitem.is-expanded .msgitem__body {
  -webkit-line-clamp: unset;
  display: block;
}

/* Attachment item -------------------------------------------- */
.attitem {
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-elev);
  overflow: hidden;
}
.attitem.is-open { border-color: var(--accent); }
.attitem__toggle {
  width: 100%;
  text-align: left;
  padding: 10px 12px;
  background: transparent;
  border: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
  color: inherit;
}
.attitem__toggle:hover { background: var(--panel-hover); }
.attitem__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.attitem__title {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  flex: 1;
}
.attitem__icon { font-size: 16px; flex-shrink: 0; }
.attitem__name {
  font-size: var(--fs-13);
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.attitem__sub,
.attitem__summary {
  font-size: 11px;
  color: var(--muted);
}
.attitem__summary { color: var(--text-soft); }
.attitem__detail {
  border-top: 1px solid var(--border);
  padding: 10px;
  background: var(--panel);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.iconbtn--danger {
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-sm);
  background: transparent;
  border: 1px solid transparent;
  color: var(--muted);
  font-size: 13px;
  transition: all var(--t-fast);
  flex-shrink: 0;
}
.iconbtn--danger:hover {
  color: var(--danger);
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.3);
}

/* Sheet preview ---------------------------------------------- */
.sheettabs {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 6px;
}
.sheettabs__tab {
  padding: 4px 10px;
  font-size: 11px;
  border-radius: var(--r-pill);
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  white-space: nowrap;
}
.sheettabs__tab.is-active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}
.sheet {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.sheet__preamble {
  font-size: 11px;
  color: var(--muted);
  font-family: var(--font-mono);
  background: var(--bg);
  padding: 6px 8px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
}
.sheet__meta {
  font-size: 11px;
  color: var(--muted-2);
}
.sheet__scroller {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  max-height: 420px;
  overflow-y: auto;
}
.sheet__table {
  border-collapse: collapse;
  font-size: 11px;
  width: 100%;
  min-width: max-content;
}
.sheet__table th,
.sheet__table td {
  padding: 5px 8px;
  border-bottom: 1px solid var(--border);
  border-right: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
  white-space: nowrap;
  max-width: 280px;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sheet__table th {
  background: var(--panel-2);
  color: var(--text);
  font-weight: 600;
  position: sticky;
  top: 0;
  z-index: 1;
}
.sheet__table tbody tr:hover td { background: var(--panel-hover); }
.sheet__more { align-self: center; }
.sheet__note {
  font-size: 11px;
  color: var(--muted-2);
  font-style: italic;
}

/* Report item ------------------------------------------------- */
.repitem {
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-elev);
  overflow: hidden;
}
.repitem.is-open { border-color: var(--accent); }
.repitem__toggle {
  width: 100%;
  text-align: left;
  padding: 10px 12px;
  background: transparent;
  border: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
  color: inherit;
}
.repitem__toggle:hover { background: var(--panel-hover); }
.repitem__head {
  display: flex;
  align-items: center;
  gap: 8px;
}
.repitem__icon { font-size: 16px; }
.repitem__title {
  font-size: var(--fs-13);
  font-weight: 600;
  color: var(--text);
}
.repitem__sub {
  font-size: 11px;
  color: var(--muted);
}
.repitem__content {
  padding: 10px 12px;
  border-top: 1px solid var(--border);
  background: var(--panel);
  font-size: var(--fs-13);
  max-height: 480px;
  overflow-y: auto;
}

/* Mobile: full-screen drawer + show backdrop ------------------ */
@media (max-width: 720px) {
  .filepanel { width: 100vw; }
  .filepanel__backdrop.is-open {
    opacity: 1;
    pointer-events: auto;
  }
}