*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #faf9f7;
  --bg-2: #f3f2ef;
  --bg-3: #eceae6;
  --border: rgba(0, 0, 0, 0.08);
  --border-mid: rgba(0, 0, 0, 0.14);
  --text: #1a1a1a;
  --text-2: #666;
  --text-3: #aaa;
  --white: #ffffff;
  --icon-bar: 56px;
  --panel-w: 280px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
}

html,
body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family:
    "Inter",
    system-ui,
    -apple-system,
    sans-serif;
  font-size: 14px;
  line-height: 1.6;
  overflow: hidden;
}

/* ─── LAYOUT ─── */
.app {
  display: flex;
  height: 100vh;
}

/* ─── ICON BAR (narrow, like Perplexity) ─── */
.icon-bar {
  width: var(--icon-bar);
  min-width: var(--icon-bar);
  background: var(--white);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 14px 0;
  gap: 4px;
  z-index: 200;
}

.icon-logo {
  width: 32px;
  height: 32px;
  background: var(--text);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
  flex-shrink: 0;
}

.icon-logo svg {
  color: var(--white);
}

.icon-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--text-3);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition:
    background 0.12s,
    color 0.12s;
  position: relative;
}

.icon-btn:hover {
  background: var(--bg-2);
  color: var(--text);
}

.icon-btn.active {
  background: var(--bg-2);
  color: var(--text);
}

.icon-btn-bottom {
  margin-top: auto;
}

/* ─── SLIDE PANEL (docs) ─── */
.panel {
  width: var(--panel-w);
  min-width: var(--panel-w);
  background: var(--white);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transform: translateX(0);
  transition:
    width 0.22s ease,
    min-width 0.22s ease,
    opacity 0.18s;
}

.panel.collapsed {
  width: 0;
  min-width: 0;
  overflow: hidden;
  opacity: 0;
}

.panel-header {
  padding: 16px 16px 12px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.panel-title {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-3);
}

.panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
}

.panel-body::-webkit-scrollbar {
  width: 3px;
}
.panel-body::-webkit-scrollbar-thumb {
  background: var(--bg-3);
  border-radius: 2px;
}

.upload-trigger {
  width: 100%;
  background: var(--bg);
  border: 1px dashed var(--border-mid);
  border-radius: 8px;
  padding: 11px 12px;
  color: var(--text-2);
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.12s;
  margin-bottom: 12px;
}

.upload-trigger:hover {
  background: var(--bg-2);
  border-color: var(--border-mid);
  color: var(--text);
}

.doc-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.doc-item {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 9px;
  border-radius: 7px;
  transition: background 0.1s;
  cursor: default;
}

.doc-item:hover {
  background: var(--bg);
}

.doc-icon {
  width: 30px;
  height: 30px;
  background: var(--bg-2);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-3);
  flex-shrink: 0;
}

.doc-info {
  flex: 1;
  min-width: 0;
}

.doc-name {
  font-size: 12px;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.3;
}

.doc-meta {
  font-size: 11px;
  color: var(--text-3);
  margin-top: 1px;
}

.doc-pill {
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 500;
  flex-shrink: 0;
}

.doc-pill.indexed {
  background: var(--bg-2);
  color: var(--text-3);
}

.doc-pill.processing {
  background: #fef9ec;
  color: #92720a;
}

.doc-pill.deleting {
  background: #fef3ec;
  color: #c0621a;
}

.doc-pill.delete_failed {
  background: #fdf0ef;
  color: #c0392b;
}

.doc-delete {
  opacity: 0;
  background: none;
  border: none;
  color: var(--text-3);
  cursor: pointer;
  padding: 3px;
  border-radius: 4px;
  transition:
    opacity 0.1s,
    color 0.1s,
    background 0.1s;
  flex-shrink: 0;
  display: flex;
  align-items: center;
}

.doc-item:hover .doc-delete {
  opacity: 1;
}
.doc-delete:hover {
  color: #c0392b;
  background: #fdf0ef;
}

.empty-state {
  text-align: center;
  padding: 24px 12px;
  color: var(--text-3);
  font-size: 12px;
  line-height: 1.9;
}

/* ─── MAIN AREA ─── */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.topbar {
  height: 52px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 20px;
  background: var(--white);
  flex-shrink: 0;
  gap: 10px;
}

.topbar-label {
  font-size: 13px;
  color: var(--text-2);
}

.topbar-label strong {
  color: var(--text);
  font-weight: 500;
}

/* ─── MESSAGES ─── */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 32px 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

.chat-messages::-webkit-scrollbar {
  width: 4px;
}
.chat-messages::-webkit-scrollbar-thumb {
  background: var(--bg-3);
  border-radius: 2px;
}

.msg-wrap {
  width: 100%;
  max-width: 680px;
  padding: 0 20px;
}

.msg-user {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 16px;
}

.msg-user-bubble {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 16px 16px 4px 16px;
  padding: 10px 15px;
  font-size: 14px;
  color: var(--text);
  max-width: 82%;
  box-shadow: var(--shadow);
  line-height: 1.55;
}

.msg-bot {
  display: flex;
  gap: 11px;
  align-items: flex-start;
  margin-bottom: 24px;
}

.bot-avatar {
  width: 26px;
  height: 26px;
  background: var(--text);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 1px;
}

.msg-bot-content {
  flex: 1;
  font-size: 14px;
  color: var(--text);
  line-height: 1.7;
}

.msg-bot-content strong {
  font-weight: 600;
  color: var(--text);
}

.msg-bot-content em {
  font-style: italic;
  color: var(--text-2);
}

.msg-bot-content blockquote {
  border-left: 2px solid var(--border-mid);
  padding: 4px 0 4px 12px;
  margin: 8px 0;
  color: var(--text-2);
  font-size: 13px;
}

.source-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 2px 7px;
  font-size: 11px;
  color: var(--text-2);
  margin-top: 8px;
}

.cite-block {
  display: flex;
  align-items: flex-start;
  gap: 6px;
  background: var(--white);
  border: 1px solid var(--border-mid);
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 12px;
  color: var(--text-2);
  margin-top: 10px;
  line-height: 1.5;
  max-width: 100%;
}

.cite-block svg {
  flex-shrink: 0;
  margin-top: 1px;
  color: var(--text-3);
}

.load-more-btn {
  display: block;
  width: 100%;
  padding: 8px;
  margin-bottom: 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 13px;
  color: var(--text-3);
  cursor: pointer;
  transition: all 0.12s;
  font-family: "Inter", sans-serif;
}

.load-more-btn:hover {
  color: var(--text-2);
  border-color: var(--border-mid);
}

/* Typing indicator */
.typing {
  display: flex;
  gap: 4px;
  align-items: center;
  padding: 4px 0;
}

.typing span {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--text-3);
  animation: blink 1.2s ease-in-out infinite;
}

.typing span:nth-child(2) {
  animation-delay: 0.18s;
}
.typing span:nth-child(3) {
  animation-delay: 0.36s;
}

@keyframes blink {
  0%,
  80%,
  100% {
    opacity: 0.25;
    transform: scale(0.8);
  }
  40% {
    opacity: 1;
    transform: scale(1);
  }
}

/* ─── INPUT AREA ─── */
.input-area {
  padding: 14px 20px 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--bg);
  flex-shrink: 0;
}

.input-card {
  width: 100%;
  max-width: 680px;
  background: var(--white);
  border: 1px solid var(--border-mid);
  border-radius: 14px;
  padding: 12px 14px;
  box-shadow: var(--shadow);
  transition:
    border-color 0.15s,
    box-shadow 0.15s;
}

.input-card:focus-within {
  border-color: rgba(0, 0, 0, 0.25);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.input-card textarea {
  width: 100%;
  background: none;
  border: none;
  outline: none;
  font-family: inherit;
  font-size: 14px;
  color: var(--text);
  resize: none;
  min-height: 22px;
  max-height: 130px;
  line-height: 1.55;
}

.input-card textarea::placeholder {
  color: var(--text-3);
}

.input-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  margin-top: 8px;
  gap: 6px;
}

.send-btn {
  width: 30px;
  height: 30px;
  background: var(--text);
  border: none;
  border-radius: 7px;
  color: var(--white);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.12s;
}

.send-btn:hover {
  opacity: 0.8;
}

.input-hint {
  font-size: 11px;
  color: var(--text-3);
  margin-top: 8px;
  text-align: center;
}

/* ─── UPLOAD MODAL ─── */
.overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.35);
  z-index: 500;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(2px);
}

.overlay.open {
  display: flex;
}

.modal {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 16px;
  width: 90%;
  max-width: 460px;
  padding: 24px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.14);
  animation: popIn 0.18s ease;
}

@keyframes popIn {
  from {
    opacity: 0;
    transform: scale(0.96) translateY(8px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.modal-head h2 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.modal-close {
  width: 28px;
  height: 28px;
  background: var(--bg-2);
  border: none;
  border-radius: 6px;
  color: var(--text-2);
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.12s;
}

.modal-close:hover {
  background: var(--bg-3);
}

.drop-zone {
  border: 1px dashed var(--border-mid);
  border-radius: 10px;
  padding: 28px 16px;
  text-align: center;
  cursor: pointer;
  transition: all 0.12s;
  margin-bottom: 14px;
  position: relative;
  background: var(--bg);
}

.drop-zone:hover,
.drop-zone.dragging {
  border-color: rgba(0, 0, 0, 0.28);
  background: var(--bg-2);
}

.drop-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.drop-icon {
  width: 36px;
  height: 36px;
  background: var(--bg-3);
  border-radius: 8px;
  margin: 0 auto 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-2);
}

.drop-text {
  font-size: 13px;
  color: var(--text-2);
}
.drop-sub {
  font-size: 11px;
  color: var(--text-3);
  margin-top: 3px;
}

.file-chips {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 12px;
}

.file-chip {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 7px 10px;
  background: var(--bg);
  border-radius: 7px;
  font-size: 12px;
  color: var(--text-2);
  border: 1px solid var(--border);
}

.field {
  margin-bottom: 12px;
}

.field label {
  display: block;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 5px;
}

.field input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 11px;
  color: var(--text);
  font-family: inherit;
  font-size: 13px;
  outline: none;
  transition: border-color 0.12s;
}

.field input:focus {
  border-color: var(--border-mid);
  background: var(--white);
}
.field input::placeholder {
  color: var(--text-3);
}

.modal-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  margin-top: 18px;
}

.btn-cancel {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 16px;
  color: var(--text-2);
  font-family: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.12s;
}

.btn-cancel:hover {
  border-color: var(--border-mid);
  color: var(--text);
}

.btn-upload {
  background: var(--text);
  border: none;
  border-radius: 8px;
  padding: 8px 18px;
  color: var(--white);
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.12s;
}

.btn-upload:hover {
  opacity: 0.82;
}
.btn-upload:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

/* ─── UPLOAD PROGRESS ─── */
.upload-progress {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 12px;
}

.prog-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
}

.prog-name {
  font-size: 12px;
  color: var(--text-2);
  margin-bottom: 7px;
}

.prog-bar {
  height: 3px;
  background: var(--bg-3);
  border-radius: 2px;
  overflow: hidden;
}

.prog-fill {
  height: 100%;
  background: var(--text);
  width: 0%;
  transition: width 0.4s ease;
  border-radius: 2px;
}

.prog-label {
  font-size: 11px;
  color: var(--text-3);
  margin-top: 5px;
}

/* ─── MOBILE ─── */
@media (max-width: 640px) {
  .panel {
    position: fixed;
    top: 0;
    left: var(--icon-bar);
    bottom: 0;
    z-index: 150;
    box-shadow: 4px 0 16px rgba(0, 0, 0, 0.08);
  }

  .chat-messages {
    padding: 20px 0;
  }
  .input-area {
    padding: 10px 14px 14px;
  }
}