/**
 * Premium Academic Styling for TNS Econometrics Copilot
 * Theme: Slate Blue & Dark Charcoal with Gold Accents
 */

:root {
  --tns-primary: #1e293b; /* Slate 800 */
  --tns-primary-light: #334155; /* Slate 700 */
  --tns-secondary: #0f172a; /* Slate 900 */
  --tns-accent: #d97706; /* Amber 600 - Academic Gold */
  --tns-accent-light: #f59e0b; /* Amber 500 */
  --tns-bg-dark: rgba(15, 23, 42, 0.95);
  --tns-text-light: #f8fafc;
  --tns-text-dark: #334155;
  --tns-text-muted: #64748b;
  --tns-card-bg: rgba(255, 255, 255, 0.04);
  --tns-card-border: rgba(255, 255, 255, 0.08);
  --tns-success: #10b981;
  --tns-error: #ef4444;
  --tns-radius: 12px;
  --tns-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
}

/* ==========================================================================
   1. FLOATING CHAT BUBBLE & CONTAINER
   ========================================================================== */

#tns-copilot-bubble {
  position: fixed;
  bottom: var(--tns-copilot-bubble-bottom, 104px);
  right: var(--tns-copilot-right, 30px);
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--tns-accent), #b45309);
  color: var(--tns-text-light);
  box-shadow: 0 4px 20px rgba(217, 119, 6, 0.4);
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  z-index: 99999;
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

#tns-copilot-bubble:hover {
  transform: scale(1.1) rotate(5deg);
  box-shadow: 0 6px 24px rgba(217, 119, 6, 0.6);
}

#tns-copilot-bubble svg {
  width: 28px;
  height: 28px;
  fill: currentColor;
}

#tns-copilot-chatbox {
  position: fixed;
  bottom: calc(var(--tns-copilot-bubble-bottom, 104px) + 75px);
  right: var(--tns-copilot-right, 30px);
  width: 420px;
  height: 600px;
  border-radius: var(--tns-radius);
  background: var(--tns-secondary);
  border: 1px solid var(--tns-card-border);
  box-shadow: var(--tns-shadow);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: 99998;
  opacity: 0;
  transform: translateY(20px) scale(0.95);
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
  font-family: 'Inter', -apple-system, sans-serif;
  color: #e2e8f0;
}

#tns-copilot-chatbox.open {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

/* ==========================================================================
   2. COMMON INTERFACE PARTS (HEADER, BODY, FOOTER)
   ========================================================================== */

.tns-chat-header {
  background: linear-gradient(90deg, var(--tns-secondary), var(--tns-primary));
  padding: 16px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--tns-card-border);
}

.tns-header-title {
  display: flex;
  align-items: center;
  gap: 10px;
}

.tns-header-title h3 {
  font-family: 'Merriweather', 'Playfair Display', serif;
  font-size: 16px;
  margin: 0;
  color: var(--tns-text-light);
  font-weight: 700;
  letter-spacing: 0.5px;
}

.tns-header-status {
  width: 8px;
  height: 8px;
  background-color: var(--tns-success);
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 8px var(--tns-success);
}

.tns-header-actions button {
  background: transparent;
  border: none;
  color: var(--tns-text-muted);
  cursor: pointer;
  font-size: 20px;
  padding: 5px;
  display: flex;
  align-items: center;
  transition: color 0.2s;
}

.tns-header-actions button:hover {
  color: var(--tns-text-light);
}

.tns-chat-messages {
  flex: 1;
  padding: 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
  background-color: #0b0f19;
}

.tns-chat-footer {
  padding: 15px;
  background-color: var(--tns-secondary);
  border-top: 1px solid var(--tns-card-border);
}

.tns-chat-input-wrapper {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--tns-card-border);
  border-radius: 20px;
  padding: 6px 12px 6px 16px;
  transition: border-color 0.2s;
}

.tns-chat-input-wrapper:focus-within {
  border-color: var(--tns-accent);
}

.tns-chat-input-wrapper textarea {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: #f1f5f9;
  font-size: 14px;
  resize: none;
  max-height: 120px;
  height: 24px;
  padding: 2px 0;
  line-height: 20px;
  font-family: inherit;
}

.tns-chat-input-wrapper textarea::placeholder {
  color: var(--tns-text-muted);
}

.tns-footer-buttons {
  display: flex;
  align-items: center;
  gap: 6px;
}

.tns-footer-btn {
  background: transparent;
  border: none;
  color: var(--tns-text-muted);
  cursor: pointer;
  padding: 6px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.tns-footer-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--tns-text-light);
}

.tns-send-btn {
  background: var(--tns-accent);
  color: var(--tns-text-light);
}

.tns-send-btn:hover {
  background: var(--tns-accent-light);
}

/* ==========================================================================
   3. MESSAGE BUBBLES & MARKDOWN BLOCKS
   ========================================================================== */

.tns-message {
  display: flex;
  flex-direction: column;
  max-width: 85%;
  animation: messageFadeIn 0.3s ease-out forwards;
}

@keyframes messageFadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.tns-message.system {
  align-self: flex-start;
}

.tns-message.user {
  align-self: flex-end;
}

.tns-message-bubble {
  padding: 12px 16px;
  border-radius: 16px;
  font-size: 14.5px;
  line-height: 1.5;
}

.tns-message.system .tns-message-bubble {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--tns-card-border);
  border-bottom-left-radius: 4px;
  color: #cbd5e1;
}

.tns-message.user .tns-message-bubble {
  background: linear-gradient(135deg, var(--tns-primary-light), var(--tns-primary));
  border-bottom-right-radius: 4px;
  color: var(--tns-text-light);
}

.tns-message-meta {
  font-size: 10px;
  color: var(--tns-text-muted);
  margin-top: 4px;
  margin-left: 4px;
}

.tns-message.user .tns-message-meta {
  align-self: flex-end;
  margin-right: 4px;
}

/* Structured response layout inside system messages */
.tns-structured-card {
  margin-top: 10px;
  border-radius: 8px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--tns-card-border);
}

.tns-card-sec {
  padding: 12px 15px;
  border-bottom: 1px solid var(--tns-card-border);
}

.tns-card-sec:last-child {
  border-bottom: none;
}

.tns-sec-title {
  font-size: 13px;
  text-transform: none; /* Hiển thị chữ tự nhiên */
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: 'Merriweather', 'Playfair Display', serif; /* Font chữ serif học thuật */
}

.tns-sec-title.problem { color: var(--tns-error); }
.tns-sec-title.explanation { color: #f59e0b; }
.tns-sec-title.fix { color: var(--tns-success); }
.tns-sec-title.commands { color: #38bdf8; }
.tns-sec-title.checklist { color: var(--tns-accent-light); }

.tns-sec-content {
  font-size: 14px;
  line-height: 1.6;
}

/* Checklist items stylings */
.tns-checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 6px;
}

.tns-checklist-item input[type="checkbox"] {
  margin-top: 4px;
  accent-color: var(--tns-accent);
  cursor: pointer;
}

.tns-checklist-item.checked span {
  text-decoration: line-through;
  color: var(--tns-text-muted);
}

/* Inline code & variables */
.tns-inline-code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Source Code Pro', monospace !important;
  font-size: 13px !important;
  color: #f43f5e !important; /* Màu hồng/đỏ nổi bật tinh tế cho variables/inline code */
  background: rgba(244, 63, 94, 0.08) !important;
  border: 1px solid rgba(244, 63, 94, 0.15) !important;
  border-radius: 4px;
  padding: 2px 6px !important;
  margin: 0 3px;
  font-weight: 500;
  display: inline-block;
  vertical-align: middle;
  line-height: 1.2;
}

/* Bullet and numbered lists formatting inside chat bubble */
.tns-message-bubble ul,
.tns-message-bubble ol {
  margin: 8px 0 8px 18px !important;
  padding: 0 !important;
}

.tns-message-bubble ul {
  list-style-type: disc !important;
}

.tns-message-bubble ol {
  list-style-type: decimal !important;
}

.tns-message-bubble li {
  margin-bottom: 6px;
  line-height: 1.6;
  display: list-item !important;
}

/* Monospace code block stylings */
pre.tns-code-block {
  background: #0b0f19 !important; /* Đảm bảo đồng bộ với theme chatbot tối */
  border: 1px solid rgba(255, 255, 255, 0.08) !important;
  border-radius: 8px;
  padding: 14px 12px;
  margin: 10px 0;
  position: relative;
  overflow-x: hidden;
  max-width: 100%;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

pre.tns-code-block code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Source Code Pro', monospace !important;
  font-size: 13px !important;
  color: #38bdf8 !important;
  background: transparent !important; /* Ghi đè triệt để nền trắng của WordPress theme */
  border: none !important;
  padding: 0 !important;
  margin: 0 !important;
  box-shadow: none !important;
  text-shadow: none !important;
  display: block;
  white-space: normal;
  line-height: 1.5 !important;
  max-width: 100%;
  overflow-wrap: anywhere;
}

.tns-code-line {
  display: grid;
  grid-template-columns: minmax(4.5rem, max-content) minmax(0, 1fr);
  column-gap: 10px;
  align-items: start;
  padding: 2px 0 8px;
}

.tns-code-line + .tns-code-line {
  margin-top: 4px;
}

.tns-code-line-empty {
  min-height: 8px;
  padding: 2px 0;
}

.tns-code-command {
  color: #a7f3d0;
  font-weight: 700;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.tns-code-args {
  color: #38bdf8;
  min-width: 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.tns-copy-code-btn {
  position: absolute;
  top: 6px;
  right: 6px;
  background: transparent;
  border: 1px solid transparent;
  color: #cbd5e1;
  font-size: 11px;
  padding: 4px 8px;
  border-radius: 4px;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-2px);
  transition: opacity 0.16s ease, transform 0.16s ease, background-color 0.16s ease, border-color 0.16s ease;
  font-family: inherit;
  font-weight: 500;
  backdrop-filter: blur(4px);
  z-index: 10;
}

pre.tns-code-block:hover .tns-copy-code-btn,
pre.tns-code-block:focus-within .tns-copy-code-btn {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.tns-copy-code-btn:hover,
.tns-copy-code-btn:focus-visible {
  background: rgba(217, 119, 6, 0.16);
  border-color: rgba(245, 158, 11, 0.45);
  color: var(--tns-text-light);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

@media (max-width: 520px) {
  pre.tns-code-block {
    padding: 34px 10px 12px;
    margin: 8px 0;
  }

  pre.tns-code-block code {
    font-size: 12px !important;
    line-height: 1.55 !important;
  }

  .tns-code-line {
    grid-template-columns: minmax(3.75rem, 7.5rem) minmax(0, 1fr);
    column-gap: 8px;
    padding-bottom: 10px;
  }
}

/* ==========================================================================
   4. DEDICATED FULL PAGE LAYOUT
   ========================================================================== */

.tns-copilot-page-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 25px;
  margin: 30px auto;
  max-width: 1200px;
  height: 700px;
  background: var(--tns-secondary);
  border-radius: var(--tns-radius);
  border: 1px solid var(--tns-card-border);
  box-shadow: var(--tns-shadow);
  overflow: hidden;
  font-family: 'Inter', -apple-system, sans-serif;
  color: #e2e8f0;
}

.tns-page-input-panel {
  padding: 25px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  background: rgba(255, 255, 255, 0.01);
  border-right: 1px solid var(--tns-card-border);
}

.tns-page-chat-panel {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.tns-input-section h2 {
  font-family: 'Merriweather', 'Playfair Display', serif;
  font-size: 20px;
  color: var(--tns-text-light);
  margin-top: 0;
  margin-bottom: 5px;
  border-bottom: 2px solid var(--tns-accent);
  padding-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.tns-input-description {
  font-size: 13.5px;
  color: var(--tns-text-muted);
  line-height: 1.5;
  margin-bottom: 15px;
}

.tns-large-textarea {
  flex: 1;
  width: 100%;
  background: #0b0f19;
  border: 1px solid var(--tns-card-border);
  border-radius: 8px;
  padding: 15px;
  color: #f1f5f9;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 13px;
  line-height: 1.6;
  resize: none;
  outline: none;
  transition: border-color 0.2s;
}

.tns-large-textarea:focus {
  border-color: var(--tns-accent);
}

/* Premium Drag Drop Area */
.tns-drag-drop-zone {
  border: 2px dashed var(--tns-card-border);
  border-radius: 8px;
  padding: 25px;
  text-align: center;
  background: rgba(255, 255, 255, 0.01);
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.tns-drag-drop-zone:hover, .tns-drag-drop-zone.dragover {
  border-color: var(--tns-accent);
  background: rgba(217, 119, 6, 0.05);
}

.tns-drag-drop-zone svg {
  width: 40px;
  height: 40px;
  color: var(--tns-accent);
}

.tns-drag-drop-text {
  font-size: 13.5px;
  color: #94a3b8;
}

.tns-action-row {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.tns-primary-btn {
  background: linear-gradient(135deg, var(--tns-accent), #b45309);
  color: var(--tns-text-light);
  border: none;
  border-radius: 20px;
  padding: 10px 24px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 12px rgba(217, 119, 6, 0.3);
}

.tns-primary-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(217, 119, 6, 0.4);
}

.tns-primary-btn:active {
  transform: translateY(0);
}

/* ==========================================================================
   5. RESPONSIVE DESIGN - MOBILE FIRST
   ========================================================================== */

@media (max-width: 900px) {
  .tns-copilot-page-container {
    grid-template-columns: 1fr;
    height: auto;
  }
  
  .tns-page-input-panel {
    border-right: none;
    border-bottom: 1px solid var(--tns-card-border);
  }
  
  .tns-large-textarea {
    min-height: 180px;
  }
  
  .tns-chat-messages {
    height: 400px;
  }
}

@media (max-width: 480px) {
  #tns-copilot-bubble {
    bottom: var(--tns-copilot-bubble-bottom, 84px);
    right: var(--tns-copilot-right, 20px);
    width: 50px;
    height: 50px;
  }
  
  #tns-copilot-chatbox {
    bottom: 0;
    right: 0;
    width: 100%;
    height: 100%;
    border-radius: 0;
    border: none;
  }
  
  .tns-message {
    max-width: 90%;
  }
}

/* Skeleton Loading styles */
.tns-skeleton-wrapper {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px;
  width: 250px;
}

.tns-skeleton-line {
  height: 12px;
  background: linear-gradient(90deg, rgba(255,255,255,0.05) 25%, rgba(255,255,255,0.1) 50%, rgba(255,255,255,0.05) 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
  border-radius: 4px;
}

.tns-skeleton-line.short { width: 60%; }
.tns-skeleton-line.medium { width: 85%; }
.tns-skeleton-line.long { width: 100%; }

@keyframes loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Warnings/Limits notification bar */
.tns-notification-bar {
  background: rgba(245, 158, 11, 0.15);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: #f59e0b;
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 12.5px;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.tns-sec-title.sources {
  color: #2563eb;
}

.tns-sources-list {
  display: grid;
  gap: 8px;
}

.tns-source-card {
  display: block;
  padding: 9px 10px;
  border: 1px solid var(--tns-card-border);
  border-radius: 6px;
  background: rgba(37, 99, 235, 0.06);
  color: inherit;
  text-decoration: none;
}

.tns-source-card:hover {
  border-color: rgba(37, 99, 235, 0.45);
  background: rgba(37, 99, 235, 0.1);
}

.tns-source-card strong,
.tns-source-card span {
  display: block;
}

.tns-source-card strong {
  font-size: 12.5px;
  line-height: 1.35;
  margin: 2px 0 4px;
}

.tns-source-card span {
  font-size: 11.5px;
  line-height: 1.4;
  color: var(--tns-text-muted);
}

.tns-source-card .tns-source-index {
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0;
  color: #2563eb;
}