/* ══════════════════════════════════════════════════════════════
   RESET & BASE
══════════════════════════════════════════════════════════════ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
    height: 100%;
    overflow: hidden;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: #1f2937;
    background: #f5f7fa;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ══════════════════════════════════════════════════════════════
   APP SHELL  — full viewport, column layout
══════════════════════════════════════════════════════════════ */
.app-shell {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
    overflow: hidden;
}

/* ══════════════════════════════════════════════════════════════
   HEADER  (fixed height, never shrinks)
══════════════════════════════════════════════════════════════ */
.app-header {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 12px;
  height: 56px;
  padding: 0 24px;
  background: #ffffff;
  border-bottom: 1px solid #e2e8f0;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
  z-index: 10;
}

.app-icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.app-title {
  font-size: 15px;
  font-weight: 600;
  color: #2d3748;
  letter-spacing: -0.01em;
}

/* ── Mobile menu button (hidden on desktop) ── */
.mobile-menu-btn {
  display: none; /* Hidden on desktop, shown on mobile */
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  color: #2d3748;
  font-size: 24px;
  transition: color 0.15s;
  margin-right: 8px;
  flex-shrink: 0;
}

.mobile-menu-btn:hover {
  color: #3182ce;
}

/* ══════════════════════════════════════════════════════════════
   APP BODY  — side-by-side, takes remaining height
══════════════════════════════════════════════════════════════ */
.app-body {
  flex: 1;
  display: flex;
  min-height: 0;
  overflow: hidden;
}

/* ══════════════════════════════════════════════════════════════
   SIDEBAR
══════════════════════════════════════════════════════════════ */
.sidebar {
  flex-shrink: 0;
  width: 280px;
  display: flex;
  flex-direction: column;
  height: 100%;
  background: #ffffff;
  border-right: 1px solid #e2e8f0;
  overflow: hidden;
}

/* ── Tab bar ── */
.sidebar-tabs {
  flex-shrink: 0;
  display: flex;
  border-bottom: 1px solid #e2e8f0;
  height: 48px;
  background: #ffffff;
}

.tab-btn {
  flex: 1;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 0 12px;
  font-size: 13px;
  font-weight: 500;
  color: #718096;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

.tab-btn:hover  { color: #4a5568; }
.tab-btn.active { color: #3182ce; border-bottom-color: #3182ce; }

/* ── Tab pane ── */
.tab-pane {
  display: none;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.tab-pane.active {
  display: flex;
}

/* ── File scroll area ── */
.file-scroll {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  min-height: 0;
}

.file-scroll::-webkit-scrollbar        { width: 6px; }
.file-scroll::-webkit-scrollbar-track  { background: #f1f5f9; }
.file-scroll::-webkit-scrollbar-thumb  { background: #cbd5e0; border-radius: 3px; }
.file-scroll::-webkit-scrollbar-thumb:hover { background: #a0aec0; }

/* ── File list ── */
.file-list {
  list-style: none;
  padding: 8px 0;
}

.empty-msg {
  padding: 32px 16px;
  text-align: center;
  color: #a0aec0;
  font-size: 13px;
}

/* ── File item ── */
.file-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  cursor: default;
  transition: background 0.12s;
}

.file-item:hover { background: #f7fafc; }

.file-icon {
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  min-width: 34px;
  min-height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #ebf8ff;
  border-radius: 6px;
  font-size: 1.4em;
  line-height: 1;
}



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

.file-name {
  font-size: 13px;
  font-weight: 500;
  color: #2d3748;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-size {
  font-size: 11px;
  color: #a0aec0;
  margin-top: 2px;
}

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

.file-action-btn {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.12s;
}

.file-action-btn svg {
  width: 15px;
  height: 15px;
  stroke: currentColor;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.file-action-btn.download { color: #3182ce; }
.file-action-btn.download:hover { background: #ebf8ff; }

.file-action-btn.delete   { color: #e53e3e; }
.file-action-btn.delete:hover  { background: #fff5f5; }

/* ── Sidebar footer (upload button) ── */
.sidebar-footer {
  flex-shrink: 0;
  padding: 12px;
  border-top: 1px solid #e2e8f0;
  background: #ffffff;
}

.upload-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 14px;
  background: #ffffff;
  border: 1.5px solid #cbd5e0;
  border-radius: 8px;
  color: #718096;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}

.upload-btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  stroke: currentColor;
  fill: none;
}

.upload-btn:hover {
  border-color: #3182ce;
  color: #3182ce;
  background: #f0f7ff;
}

/* ══════════════════════════════════════════════════════════════
   CHAT PANEL
══════════════════════════════════════════════════════════════ */
.chat-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  min-width: 0;
  background: #ffffff;
  overflow: hidden;
}

/* ── Chat top-bar ── */
.chat-topbar {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 48px;
  padding: 0 20px;
  border-bottom: 1px solid #e2e8f0;
  background: #ffffff;
}

.chat-topbar-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: black;
}

.chat-topbar-title svg {
  flex-shrink: 0;
  stroke: currentColor;
  fill: none;
}

.chat-refresh-btn {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  color: #718096;
  font-size: 18px;
  line-height: 1;
}

.chat-refresh-btn:hover {
  background: #f0f7ff;
  border-color: #3182ce;
  color: #3182ce;
}

.chat-refresh-btn.spinning {
  animation: spin 0.5s linear;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* ── Chat feed (scrollable message area) ── */
.chat-feed {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 20px;
}

.chat-feed::-webkit-scrollbar        { width: 6px; }
.chat-feed::-webkit-scrollbar-track  { background: transparent; }
.chat-feed::-webkit-scrollbar-thumb  { background: #cbd5e0; border-radius: 3px; }
.chat-feed::-webkit-scrollbar-thumb:hover { background: #a0aec0; }

/* ── Welcome banner ── */
.welcome-banner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  position: relative;   /* anchor for suggestions-wrap */
  text-align: center;
  padding: 40px 24px 120px; /* bottom padding so content doesn't overlap suggestions */
  gap: 0;
}

.welcome-robot {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: -20px;
}

.sparkles-icon {
  width: 56px;
  height: 56px;
  filter: drop-shadow(0 4px 12px rgba(59, 130, 246, 0.35));
}

.welcome-banner h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: #1a202c;
  margin-top: 0;
}

.welcome-banner > p {
  font-size: 14px;
  color: #718096;
  line-height: 1.7;
}

/* ── Suggestions — pinned to bottom-right of welcome banner ── */
.suggestions-wrap {
  position: absolute;
  bottom: 24px;
  right: 32px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;  /* right-align label + chips */
  gap: 0;
}

.suggestions-label {
  font-size: 11px;
  color: #a0aec0;
  font-weight: 500;
  margin-bottom: 10px;
  text-align: right;
}

.suggestions-list {
  display: flex;
  flex-direction: column;
  align-items: flex-end;  /* chips hug the right edge */
  gap: 8px;
}

.suggestion-chip {
  /* NO width:100% — size to content */
  display: inline-block;
  text-align: left;
  padding: 10px 16px;
  background: #f7fafc;
  border: 1px solid #697487;
  border-radius: 8px;
  font-size: 13px;
  color: #4a5568;
  font-family: inherit;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s, border-color 0.15s, box-shadow 0.15s, color 0.15s;
  line-height: 1.5;
}

.suggestion-chip:hover {
  background: #ebf8ff;
  border-color: #3182ce;
  color: #2c5282;
  box-shadow: 0 2px 8px rgba(49,130,206,0.12);
}

/* ── Chat messages ── */
.msg-row {
  display: flex;
  gap: 12px;
  animation: fadeUp 0.25s ease;
}

.msg-row.user {
  flex-direction: row-reverse;
}

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

.msg-bubble {
  max-width: 70%;
  padding-top: 10px;
  padding-bottom: 12px;
  padding-left: 16px;
  padding-right: 16px;
  border-radius: 12px;
  font-size: 14px;
  line-height: 1.6;
  word-wrap: break-word;
  overflow-wrap: break-word;
  white-space: pre-wrap;
}

.msg-row.bot .msg-bubble {
    background: #f7fafc;
    color: #2d3748;
    border-radius: 16px 16px 16px 4px;
    border: 1px solid #4a5568;
}

.msg-row.user .msg-bubble {
    background: #3182ce;
    color: #ffffff;
    border-radius: 16px 16px 4px 16px;
}

/* Typing indicator */
/*.typing-row .msg-bubble {
  padding: 14px 18px;
}*/

.typing-dots {
  display: flex;
  gap: 5px;
  align-items: center;
}

.msg-bubble-dot {
    background: #f7fafc;
    color: #2d3748;
    border-radius: 16px 16px 16px 4px;
    border: 1px solid #4a5568;
    padding: 14px;
    padding-top: 16px;
    line-height: 1.6;
}
.typing-dots span {
  width: 7px;
  height: 7px;
  background: #a0aec0;
  border-radius: 50%;
  animation: dotBounce 1.2s infinite;
}

.typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.typing-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes dotBounce {
  0%, 60%, 100% { transform: translateY(0); }
  30%           { transform: translateY(-6px); }
}

/* ── Prompt input bar ── */
.chat-input-bar {
  flex-shrink: 0;
  display: flex;
  align-items: flex-end;
  gap: 10px;
  padding: 14px 24px 18px;
  border-top: 1px solid #e2e8f0;
  background: #ffffff;
}

.prompt-textarea {
  flex: 1;
  min-height: 44px;
  max-height: 127px;  /* Approximately 5 lines (14px font × 1.5 line-height × 5 lines + 22px padding) */
  padding: 11px 14px;
  border: 1.5px solid #e2e8f0;
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  color: #2d3748;
  background: #ffffff;
  
  resize: none;
  outline: none;
  overflow-y: auto;  /* Scrollbar appears only when content exceeds max-height */
  line-height: 1.5;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.prompt-textarea::placeholder { color: #a0aec0; }

.prompt-textarea:focus {
  border-color: #3182ce;
  box-shadow: 0 0 0 3px rgba(49,130,206,0.12);
}

.send-btn {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: #3182ce;
  border: none;
  border-radius: 8px;
  color: #ffffff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
}

.send-btn svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  fill: none;
}

.send-btn:hover:not(:disabled) {
  background: #2c5282;
  box-shadow: 0 4px 12px rgba(49,130,206,0.3);
  transform: translateY(-1px);
}

.send-btn:active:not(:disabled) { transform: translateY(0); }

.send-btn:disabled {
  background: #cbd5e0;
  cursor: not-allowed;
  box-shadow: none;
}

/* ══════════════════════════════════════════════════════════════
   MOBILE RESPONSIVE STYLES
══════════════════════════════════════════════════════════════ */
@media (max-width: 768px) {
  /* ── Header adjustments ── */
  .app-header {
    height: 50px;
    padding: 0 16px;
    gap: 8px;
  }

  .app-icon {
    width: 24px;
    height: 24px;
  }

  .app-title {
    font-size: 14px;
  }

  /* ── Show mobile menu button ── */
  .mobile-menu-btn {
    display: flex;
  }

  /* ── Sidebar becomes overlay on mobile ── */
  .sidebar {
    position: fixed;
    left: -280px;
    top: 50px;
    height: calc(100vh - 50px);
    width: 280px;
    z-index: 1000;
    transition: left 0.3s ease;
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0);
  }

  .sidebar.active {
    left: 0;
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.15);
  }

  /* ── Overlay backdrop when sidebar is open ── */
  .sidebar-overlay {
    display: none;
    position: fixed;
    top: 50px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 999;
    opacity: 0;
    transition: opacity 0.3s ease;
  }

  .sidebar-overlay.active {
    display: block;
    opacity: 1;
  }

  /* ── Chat panel takes full width ── */
  .chat-panel {
    width: 100%;
  }

  /* ── Chat top-bar ── */
  .chat-topbar {
    height: 44px;
    padding: 0 12px;
  }

  .chat-topbar-title {
    font-size: 12px;
  }

  .chat-refresh-btn {
    width: 32px;
    height: 32px;
    font-size: 16px;
  }

  /* ── Chat feed adjustments ── */
  .chat-feed {
    padding: 16px 12px;
    gap: 12px;
  }

  /* ── Welcome banner ── */
  .welcome-banner {
    padding: 24px 16px 100px;
  }

  .sparkles-icon {
    width: 44px;
    height: 44px;
  }

  .welcome-banner h2 {
    font-size: 1.25rem;
  }

  .welcome-banner > p {
    font-size: 13px;
  }

  /* ── Suggestions positioning ── */
  .suggestions-wrap {
    position: static;
    width: 100%;
    align-items: stretch;
    margin-top: 24px;
  }

  .suggestions-label {
    text-align: left;
    margin-bottom: 8px;
  }

  .suggestions-list {
    align-items: stretch;
    gap: 6px;
  }

  .suggestion-chip {
    width: 100%;
    text-align: left;
    padding: 10px 14px;
    font-size: 12px;
    white-space: normal;
  }

  /* ── Message bubbles ── */
  .msg-row {
    gap: 8px;
  }

  .msg-bubble {
    max-width: 85%;
    padding: 10px 14px;
    font-size: 13px;
    line-height: 1.5;
  }

  /* ── Typing indicator ── */
  .typing-row .msg-bubble {
    padding: 12px 16px;
  }

  .typing-dots span {
    width: 6px;
    height: 6px;
  }

  /* ── Input bar ── */
  .chat-input-bar {
    padding: 10px 12px 12px;
    gap: 8px;
  }

  .prompt-textarea {
    min-height: 42px;
    max-height: 100px;
    padding: 10px 12px;
    font-size: 14px;
  }

  .send-btn {
    width: 42px;
    height: 42px;
  }

  .send-btn svg {
    width: 16px;
    height: 16px;
  }
}

/* ── Tablet adjustments (portrait) ── */
@media (max-width: 1024px) and (min-width: 769px) {
  .sidebar {
    width: 240px;
  }

  .chat-feed {
    padding: 20px 24px;
  }

  .msg-bubble {
    max-width: 80%;
  }
}
/* ── Small mobile devices ── */
@media (max-width: 480px) {

    /* ✅ Fix full height layout */
    html, body {
        height: 100%;
        overflow: hidden;
    }

    .app-container {
        display: flex;
        flex-direction: column;
        height: 100vh;
    }

    .chat-wrapper {
        display: flex;
        flex-direction: column;
        flex: 1;
        overflow: hidden;
    }

    /* ✅ Chat scroll area */
    .chat-feed {
        flex: 1;
        overflow-y: auto;
        padding: 12px 10px 90px; /* space for input */
    }

    /* ✅ FIX: Always visible input */
    .chat-input-bar {
        position: fixed; /* 🔥 IMPORTANT */
        bottom: 0;
        left: 0;
        right: 0;
        background: #fff;
        border-top: 1px solid #ddd;
        padding: 8px 10px 10px;
        display: flex;
        gap: 6px;
        z-index: 9999;
    }

    /* ✅ Textarea */
    .prompt-textarea {
        min-height: 40px;
        max-height: 90px;
        font-size: 13px;
    }

    /* ✅ Send button */
    .send-btn {
        width: 40px;
        height: 40px;
    }

    /* ✅ FIX refresh button */
    .refresh-btn {
        width: 32px;
        height: 32px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 14px;
        border-radius: 6px;
    }

    /* ✅ Other UI tweaks */
    .app-header {
        height: 48px;
        padding: 0 12px;
    }

    .chat-topbar {
        height: 42px;
        padding: 0 10px;
    }

    .welcome-banner {
        padding: 20px 12px 100px;
    }

    .msg-bubble {
        max-width: 90%;
        font-size: 13px;
    }
}

/* ══════════════════════════════════════════════════════════════
   CUSTOM MODAL
══════════════════════════════════════════════════════════════ */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 9999;
  align-items: center;
  justify-content: center;
}

.modal-overlay.active {
  display: flex;
}

.modal-box {
  background: #ffffff;
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  max-width: 440px;
  width: 90%;
  padding: 24px;
  animation: modalFadeIn 0.2s ease-out;
}

@keyframes modalFadeIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.modal-icon {
  display: none;
  justify-content: center;
  align-items: center;
  margin-bottom: 16px;
}

.modal-icon svg {
  width: 48px;
  height: 48px;
}

.modal-title {
  display: none;
  font-size: 20px;
  font-weight: 600;
  color: #2d3748;
  text-align: center;
  margin-bottom: 12px;
}

.modal-message {
  font-size: 15px;
  line-height: 1.6;
  color: #2d3748;
  margin-bottom: 24px;
  text-align: center;
  word-break: break-word;
}

.modal-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.modal-btn {
  flex: 1;
  max-width: 120px;
  padding: 10px 20px;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.modal-btn-ok {
  background: #3182ce;
  color: #ffffff;
}

.modal-btn-ok:hover {
  background: #2c5282;
}

.modal-btn-ok:active {
  transform: translateY(1px);
}

.modal-btn-ok:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.4);
}

.modal-btn-cancel {
  background: #e2e8f0;
  color: #2d3748;
}

.modal-btn-cancel:hover {
  background: #cbd5e0;
}

.modal-btn-cancel:active {
  transform: translateY(1px);
}

.modal-btn-cancel:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(226, 232, 240, 0.8);
}

/* ── Mobile adjustments ── */
@media (max-width: 480px) {
  .modal-box {
    width: 85%;
    padding: 20px;
  }

  .modal-message {
    font-size: 14px;
    margin-bottom: 20px;
  }

  .modal-btn {
    max-width: none;
    padding: 12px 16px;
  }
}