/* ============================================================
   BanglaSumQA — Complete Design System
   Light Orange ChatGPT-inspired theme with Bangla typography
   ============================================================ */

/* Google Fonts already loaded via index.html */

/* ── CSS Custom Properties ────────────────────────────────── */
:root {
  /* Orange Palette */
  --orange-50:  #FFF7ED;
  --orange-100: #FFEDD5;
  --orange-200: #FED7AA;
  --orange-300: #FDBA74;
  --orange-400: #FB923C;
  --orange-500: #F97316;
  --orange-600: #EA580C;
  --orange-700: #C2410C;

  /* Stone / Neutral */
  --stone-50:  #FAFAF9;
  --stone-100: #F5F5F4;
  --stone-200: #E7E5E4;
  --stone-300: #D6D3D1;
  --stone-400: #A8A29E;
  --stone-500: #78716C;
  --stone-600: #57534E;
  --stone-700: #44403C;
  --stone-800: #292524;
  --stone-900: #1C1917;

  /* Semantic Tokens */
  --bg-app:           #FFFBF7;
  --bg-sidebar:       #FFF4E8;
  --bg-sidebar-hover: #FFE8CC;
  --bg-chat:          #FFFBF7;
  --bg-input-bar:     #FFFFFF;
  --bg-input-field:   #FFF8F2;
  --bg-user-msg:      var(--orange-500);
  --bg-bot-msg:       #FFFFFF;
  --bg-welcome-card:  #FFFFFF;

  --text-primary:   #1C1917;
  --text-secondary: #57534E;
  --text-muted:     #A8A29E;
  --text-on-orange: #FFFFFF;
  --text-accent:    var(--orange-600);

  --border-light:   #FED7AA;
  --border-medium:  #FDBA74;
  --border-input:   #FED7AA;
  --border-focus:   var(--orange-500);

  --shadow-xs:  0 1px 3px rgba(249,115,22,0.08);
  --shadow-sm:  0 2px 8px rgba(249,115,22,0.10);
  --shadow-md:  0 4px 20px rgba(249,115,22,0.13);
  --shadow-lg:  0 8px 40px rgba(249,115,22,0.16);
  --shadow-xl:  0 16px 60px rgba(249,115,22,0.20);

  --radius-xs:   4px;
  --radius-sm:   8px;
  --radius-md:   12px;
  --radius-lg:   16px;
  --radius-xl:   20px;
  --radius-2xl:  24px;
  --radius-full: 9999px;

  /* Layout */
  --sidebar-width:    260px;
  --summary-width:    340px;
  --input-bar-height: 90px;
  --header-height:    60px;

  /* Typography */
  --font-ui:     'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-bangla: 'Noto Sans Bengali', 'Inter', sans-serif;

  /* Transitions */
  --ease-out:   cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in:    cubic-bezier(0.4, 0, 1, 1);
  --ease-inout: cubic-bezier(0.4, 0, 0.2, 1);
  --dur-fast:   150ms;
  --dur-med:    250ms;
  --dur-slow:   400ms;
}

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

html, body, #root {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: var(--font-ui);
  background: var(--bg-app);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Bangla text rendering */
.bangla {
  font-family: var(--font-bangla);
  line-height: 1.8;
}

/* Scrollbar */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--orange-200);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover { background: var(--orange-300); }

/* ── App Layout ───────────────────────────────────────────── */
.app-container {
  display: flex;
  height: 100vh;
  overflow: hidden;
  background: var(--bg-app);
}

/* ── Sidebar ──────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: width var(--dur-med) var(--ease-out);
  z-index: 100;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 16px 16px;
  border-bottom: 1px solid var(--border-light);
}

.sidebar-logo-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--orange-500), var(--orange-600));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: white;
  font-weight: 700;
  font-family: var(--font-bangla);
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}

.sidebar-logo-text {
  display: flex;
  flex-direction: column;
}

.sidebar-logo-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

.sidebar-logo-tagline {
  font-size: 10px;
  color: var(--text-muted);
  font-weight: 400;
  font-family: var(--font-bangla);
}

.sidebar-section {
  padding: 12px 10px 6px;
}

.sidebar-section-label {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  padding: 0 6px 6px;
}

.sidebar-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 13.5px;
  font-weight: 500;
  font-family: var(--font-ui);
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out);
  text-align: left;
}

.sidebar-btn:hover {
  background: var(--bg-sidebar-hover);
  color: var(--text-primary);
}

.sidebar-btn.active {
  background: var(--orange-100);
  color: var(--orange-700);
}

.sidebar-btn-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  opacity: 0.7;
}

.sidebar-btn:hover .sidebar-btn-icon,
.sidebar-btn.active .sidebar-btn-icon {
  opacity: 1;
}

.new-chat-btn {
  margin: 10px;
  padding: 10px 14px;
  background: linear-gradient(135deg, var(--orange-500), var(--orange-600));
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all var(--dur-fast) var(--ease-out);
  box-shadow: var(--shadow-sm);
  font-family: var(--font-ui);
}

.new-chat-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  background: linear-gradient(135deg, var(--orange-600), var(--orange-700));
}

.new-chat-btn:active {
  transform: translateY(0);
}

.sidebar-history {
  flex: 1;
  overflow-y: auto;
  padding: 0 10px;
}

.history-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--dur-fast);
  font-size: 12.5px;
  color: var(--text-secondary);
  font-family: var(--font-bangla);
}

.history-item:hover {
  background: var(--bg-sidebar-hover);
  color: var(--text-primary);
}

.history-item-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--orange-300);
  flex-shrink: 0;
}

.history-item-text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-footer {
  padding: 12px 10px;
  border-top: 1px solid var(--border-light);
}

.sidebar-footer-info {
  font-size: 10.5px;
  color: var(--text-muted);
  padding: 4px 12px;
  font-family: var(--font-bangla);
  line-height: 1.6;
}

/* ── Main Area ────────────────────────────────────────────── */
.main-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
  min-width: 0;
}

/* ── Chat Header ──────────────────────────────────────────── */
.chat-header {
  height: var(--header-height);
  border-bottom: 1px solid var(--border-light);
  background: rgba(255,251,247,0.9);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  flex-shrink: 0;
  z-index: 10;
}

.chat-header-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-bangla);
}

.chat-header-badge {
  font-size: 10px;
  padding: 2px 8px;
  background: var(--orange-100);
  color: var(--orange-700);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-family: var(--font-ui);
}

.chat-header-actions {
  display: flex;
  gap: 6px;
}

.header-icon-btn {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--dur-fast);
}

.header-icon-btn:hover {
  background: var(--orange-100);
  color: var(--orange-600);
}

/* ── Chat Window ──────────────────────────────────────────── */
.chat-window {
  flex: 1;
  overflow-y: auto;
  padding: 24px 0;
  display: flex;
  flex-direction: column;
  scroll-behavior: smooth;
}

/* ── Welcome Screen ───────────────────────────────────────── */
.welcome-screen {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  text-align: center;
  animation: fadeInUp 0.5s var(--ease-out);
}

.welcome-logo {
  width: 72px;
  height: 72px;
  border-radius: 20px;
  background: linear-gradient(135deg, var(--orange-400), var(--orange-600));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  color: white;
  font-family: var(--font-bangla);
  font-weight: 700;
  margin-bottom: 20px;
  box-shadow: var(--shadow-lg);
  animation: pulse-glow 3s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: var(--shadow-lg); }
  50%       { box-shadow: 0 8px 40px rgba(249,115,22,0.35); }
}

.welcome-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
  margin-bottom: 6px;
}

.welcome-title span {
  background: linear-gradient(135deg, var(--orange-500), var(--orange-700));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.welcome-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 4px;
  font-family: var(--font-bangla);
  line-height: 1.7;
}

.welcome-subtitle-en {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 36px;
}

.welcome-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  max-width: 680px;
  width: 100%;
  margin-bottom: 32px;
}

.welcome-card {
  background: var(--bg-welcome-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 20px 16px;
  text-align: left;
  cursor: pointer;
  transition: all var(--dur-med) var(--ease-out);
  box-shadow: var(--shadow-xs);
}

.welcome-card:hover {
  border-color: var(--orange-300);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.welcome-card-icon {
  font-size: 26px;
  margin-bottom: 10px;
  display: block;
}

.welcome-card-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 5px;
  font-family: var(--font-bangla);
}

.welcome-card-desc {
  font-size: 11.5px;
  color: var(--text-muted);
  line-height: 1.6;
  font-family: var(--font-bangla);
}

.welcome-tips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  max-width: 600px;
}

.welcome-tip {
  font-size: 11.5px;
  color: var(--text-muted);
  background: var(--orange-50);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  padding: 4px 12px;
  font-family: var(--font-bangla);
}

/* ── Messages ─────────────────────────────────────────────── */
.messages-container {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 0 16px;
  max-width: 860px;
  margin: 0 auto;
  width: 100%;
}

.message-row {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  animation: messageIn 0.3s var(--ease-out);
}

@keyframes messageIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

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

.message-avatar {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  flex-shrink: 0;
  margin-bottom: 2px;
  font-family: var(--font-bangla);
}

.message-avatar.bot {
  background: linear-gradient(135deg, var(--orange-400), var(--orange-600));
  color: white;
  font-weight: 700;
  box-shadow: var(--shadow-xs);
}

.message-avatar.user {
  background: var(--stone-200);
  color: var(--stone-600);
}

.message-bubble-wrapper {
  display: flex;
  flex-direction: column;
  max-width: 78%;
  gap: 4px;
}

.message-row.user .message-bubble-wrapper {
  align-items: flex-end;
}

.message-bubble {
  padding: 12px 16px;
  border-radius: var(--radius-xl);
  font-size: 14px;
  line-height: 1.75;
  position: relative;
  font-family: var(--font-bangla);
}

.message-bubble.user {
  background: linear-gradient(135deg, var(--orange-500), var(--orange-600));
  color: white;
  border-bottom-right-radius: var(--radius-xs);
  box-shadow: var(--shadow-sm);
}

.message-bubble.bot {
  background: var(--bg-bot-msg);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
  border-bottom-left-radius: var(--radius-xs);
  box-shadow: var(--shadow-xs);
}

/* Markdown inside bot bubbles */
.message-bubble.bot p { margin-bottom: 8px; }
.message-bubble.bot p:last-child { margin-bottom: 0; }
.message-bubble.bot ul, .message-bubble.bot ol {
  padding-left: 18px;
  margin-bottom: 8px;
}
.message-bubble.bot li { margin-bottom: 4px; }
.message-bubble.bot strong { color: var(--orange-700); }
.message-bubble.bot code {
  background: var(--orange-50);
  color: var(--orange-700);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 12px;
  font-family: monospace;
}

.message-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 4px;
}

.message-time {
  font-size: 10px;
  color: var(--text-muted);
  font-family: var(--font-ui);
}

.copy-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: var(--radius-xs);
  color: var(--text-muted);
  font-size: 10px;
  display: flex;
  align-items: center;
  gap: 3px;
  transition: all var(--dur-fast);
  font-family: var(--font-ui);
}

.copy-btn:hover {
  color: var(--orange-600);
  background: var(--orange-50);
}

/* ── Loading Bubble ───────────────────────────────────────── */
.loading-bubble {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 14px 18px;
  background: var(--bg-bot-msg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  border-bottom-left-radius: var(--radius-xs);
  box-shadow: var(--shadow-xs);
  width: fit-content;
}

.loading-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--orange-400);
  animation: loadingBounce 1.2s ease-in-out infinite;
}
.loading-dot:nth-child(2) { animation-delay: 0.15s; }
.loading-dot:nth-child(3) { animation-delay: 0.30s; }

@keyframes loadingBounce {
  0%, 80%, 100% { transform: scale(0.7); opacity: 0.5; }
  40%           { transform: scale(1.0); opacity: 1.0; }
}

.loading-label {
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--font-bangla);
  margin-left: 4px;
}

/* ── Input Bar ────────────────────────────────────────────── */
.input-bar-wrapper {
  border-top: 1px solid var(--border-light);
  background: var(--bg-input-bar);
  padding: 12px 16px 16px;
  flex-shrink: 0;
}

.input-bar-inner {
  max-width: 860px;
  margin: 0 auto;
}

.attachment-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--orange-100);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-full);
  padding: 4px 10px 4px 8px;
  font-size: 12px;
  color: var(--orange-700);
  margin-bottom: 8px;
  font-family: var(--font-ui);
  font-weight: 500;
}

.attachment-chip-icon { font-size: 14px; }

.attachment-chip-remove {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--orange-500);
  font-size: 14px;
  line-height: 1;
  padding: 0;
  display: flex;
  align-items: center;
  transition: color var(--dur-fast);
}
.attachment-chip-remove:hover { color: var(--orange-700); }

.input-box {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  background: var(--bg-input-field);
  border: 1.5px solid var(--border-input);
  border-radius: var(--radius-2xl);
  padding: 8px 8px 8px 14px;
  transition: border-color var(--dur-fast), box-shadow var(--dur-fast);
}

.input-box:focus-within {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(249,115,22,0.10);
}

.input-textarea {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  font-size: 14px;
  font-family: var(--font-bangla);
  color: var(--text-primary);
  resize: none;
  line-height: 1.7;
  max-height: 180px;
  overflow-y: auto;
  padding: 4px 0;
}

.input-textarea::placeholder {
  color: var(--text-muted);
  font-family: var(--font-bangla);
}

.input-actions {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  flex-shrink: 0;
}

.input-action-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--dur-fast);
  font-size: 16px;
}

.input-action-btn:hover {
  background: var(--orange-100);
  color: var(--orange-600);
}

.input-action-btn.recording {
  background: #FEE2E2;
  color: #DC2626;
  animation: recordingPulse 1.2s ease-in-out infinite;
}

@keyframes recordingPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(220,38,38,0.3); }
  50%       { box-shadow: 0 0 0 6px rgba(220,38,38,0.0); }
}

.send-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  border: none;
  background: linear-gradient(135deg, var(--orange-500), var(--orange-600));
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--dur-fast) var(--ease-out);
  box-shadow: var(--shadow-sm);
}

.send-btn:hover:not(:disabled) {
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
  background: linear-gradient(135deg, var(--orange-600), var(--orange-700));
}

.send-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.input-hint {
  font-size: 10.5px;
  color: var(--text-muted);
  text-align: center;
  margin-top: 8px;
  font-family: var(--font-bangla);
}

.input-hint a { color: var(--orange-500); text-decoration: none; }

/* ── Summary Panel ────────────────────────────────────────── */
.summary-panel {
  width: var(--summary-width);
  min-width: var(--summary-width);
  height: 100vh;
  background: #FFFFFF;
  border-left: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: slideInRight 0.35s var(--ease-out);
  z-index: 50;
}

@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to   { transform: translateX(0);    opacity: 1; }
}

.summary-panel-header {
  background: linear-gradient(135deg, var(--orange-500), var(--orange-600));
  padding: 16px;
  flex-shrink: 0;
}

.summary-panel-header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.summary-panel-title {
  font-size: 13px;
  font-weight: 700;
  color: white;
  letter-spacing: 0.2px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.summary-panel-close {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255,255,255,0.3);
  background: rgba(255,255,255,0.15);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: background var(--dur-fast);
}
.summary-panel-close:hover { background: rgba(255,255,255,0.25); }

.summary-file-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.2);
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: var(--radius-sm);
  padding: 5px 10px;
  font-size: 11px;
  color: white;
  font-family: var(--font-ui);
  font-weight: 500;
  width: fit-content;
}

.summary-stats {
  display: flex;
  gap: 12px;
  margin-top: 8px;
}

.summary-stat {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 10.5px;
  color: rgba(255,255,255,0.85);
  font-family: var(--font-ui);
}

.summary-panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
}

.summary-section-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.summary-text {
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--text-primary);
  font-family: var(--font-bangla);
  background: var(--orange-50);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 14px;
  white-space: pre-wrap;
}

.summary-panel-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--border-light);
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.summary-action-btn {
  flex: 1;
  padding: 9px 12px;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--border-medium);
  background: white;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  font-family: var(--font-ui);
  color: var(--text-secondary);
  transition: all var(--dur-fast);
}

.summary-action-btn:hover {
  border-color: var(--orange-400);
  color: var(--orange-600);
  background: var(--orange-50);
}

.summary-action-btn.primary {
  background: linear-gradient(135deg, var(--orange-500), var(--orange-600));
  color: white;
  border-color: transparent;
  box-shadow: var(--shadow-sm);
}

.summary-action-btn.primary:hover {
  background: linear-gradient(135deg, var(--orange-600), var(--orange-700));
  box-shadow: var(--shadow-md);
}

/* ── Processing Overlay ───────────────────────────────────── */
.processing-overlay {
  background: var(--bg-bot-msg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 78%;
  box-shadow: var(--shadow-xs);
  animation: messageIn 0.3s var(--ease-out);
  font-family: var(--font-bangla);
}

.processing-spinner {
  width: 20px;
  height: 20px;
  border: 2.5px solid var(--orange-200);
  border-top-color: var(--orange-500);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  flex-shrink: 0;
}

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

.processing-text {
  font-size: 13px;
  color: var(--text-secondary);
}

.processing-step {
  font-size: 11px;
  color: var(--orange-500);
  font-weight: 600;
  margin-top: 2px;
}

/* ── Error Toast ──────────────────────────────────────────── */
.error-bubble {
  background: #FEF2F2;
  border: 1px solid #FECACA;
  color: #DC2626;
  font-size: 13px;
  border-radius: var(--radius-lg);
  padding: 10px 14px;
  font-family: var(--font-bangla);
  max-width: 78%;
}

/* ── API Key Banner ───────────────────────────────────────── */
.api-key-banner {
  background: linear-gradient(135deg, #FFF7ED, #FFEDD5);
  border: 1px solid var(--orange-200);
  border-radius: var(--radius-md);
  padding: 10px 16px;
  font-size: 12px;
  color: var(--orange-700);
  margin: 12px 16px 0;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-bangla);
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
}

/* ── Utility Animations ───────────────────────────────────── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Responsive: Collapse sidebar on small screens ─────────── */
@media (max-width: 768px) {
  .sidebar { display: none; }
  .summary-panel { display: none; }
  .welcome-cards { grid-template-columns: 1fr; max-width: 320px; }
}