/* ============================================================
   DEBATEAI — Futuristic Dark UI
   ============================================================ */

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

:root {
  --bg:        #080b10;
  --bg2:       #0d1117;
  --surface:   #111820;
  --surface2:  #161e28;
  --border:    rgba(0,245,255,0.08);
  --border2:   rgba(0,245,255,0.18);
  --cyan:      #00f5ff;
  --violet:    #7c3aed;
  --violet2:   #a855f7;
  --text:      #e2e8f0;
  --text2:     #64748b;
  --text3:     #94a3b8;
  --green:     #22d3a5;
  --red:       #f87171;
  --glow-c:    rgba(0,245,255,0.15);
  --glow-v:    rgba(124,58,237,0.2);
  --sidebar-w: 280px;
  --font-head: 'Syne', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 14px;
  overflow: hidden;
}

/* ---- Grid Canvas Background ---- */
#grid-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.35;
}

/* ============================================================
   SIDEBAR
   ============================================================ */
.sidebar {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: var(--sidebar-w);
  background: var(--bg2);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: 10;
  backdrop-filter: blur(20px);
}

.sidebar-header {
  padding: 28px 20px 20px;
  border-bottom: 1px solid var(--border);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  width: 36px; height: 36px;
  flex-shrink: 0;
  filter: drop-shadow(0 0 8px rgba(0,245,255,0.5));
}

.logo-text {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: 0.5px;
  background: linear-gradient(135deg, var(--cyan), var(--violet2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ---- New Chat ---- */
.new-chat-section {
  padding: 14px 16px 10px;
  border-bottom: 1px solid var(--border);
}

.new-chat-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  background: transparent;
  border: 1px solid var(--border2);
  border-radius: 11px;
  color: var(--text3);
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 9px 14px;
  cursor: pointer;
  transition: all 0.22s ease;
  letter-spacing: 0.3px;
  position: relative;
  overflow: hidden;
}

.new-chat-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--glow-c), var(--glow-v));
  opacity: 0;
  transition: opacity 0.25s;
}

.new-chat-btn:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 0 0 16px rgba(0,245,255,0.1);
}

.new-chat-btn:hover::before { opacity: 1; }

.new-chat-btn:active {
  transform: scale(0.98);
}

.new-chat-icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
  transition: filter 0.22s;
}

.new-chat-btn:hover .new-chat-icon {
  filter: drop-shadow(0 0 5px rgba(0,245,255,0.6));
}

.new-chat-icon svg { width: 100%; height: 100%; }

.new-chat-label {
  position: relative;
  z-index: 1;
  font-weight: 500;
}

/* ---- Source Panel ---- */
.source-panel {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.panel-label {
  font-size: 10px;
  letter-spacing: 2.5px;
  color: var(--text2);
  font-weight: 500;
}

.upload-zone {
  border: 1px dashed var(--border2);
  border-radius: 12px;
  background: var(--surface);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  position: relative;
  overflow: hidden;
}

.upload-zone::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--glow-c), var(--glow-v));
  opacity: 0;
  transition: opacity 0.3s;
}

.upload-zone:hover::before,
.upload-zone.dragover::before { opacity: 1; }

.upload-zone:hover,
.upload-zone.dragover { border-color: var(--cyan); }

.upload-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 24px 16px;
  position: relative;
  z-index: 1;
}

.upload-icon {
  width: 32px; height: 32px;
  color: var(--cyan);
  opacity: 0.7;
}

.upload-icon svg { width: 100%; height: 100%; }

.upload-text {
  color: var(--text3);
  font-size: 13px;
}

.upload-sub {
  color: var(--text2);
  font-size: 11px;
}

/* File Loaded */
.file-loaded {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(34,211,165,0.06);
  border: 1px solid rgba(34,211,165,0.25);
  border-radius: 10px;
  padding: 10px 12px;
  gap: 8px;
  animation: slideIn 0.3s ease;
}

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

.file-info {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow: hidden;
}

.file-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 6px var(--green);
  flex-shrink: 0;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

.file-name {
  color: var(--green);
  font-size: 12px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.clear-btn {
  background: none;
  border: none;
  color: var(--text2);
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  width: 24px; height: 24px;
  display: flex; align-items: center; justify-content: center;
  transition: color 0.2s, background 0.2s;
  flex-shrink: 0;
}

.clear-btn:hover { color: var(--red); background: rgba(248,113,113,0.1); }
.clear-btn svg { width: 14px; height: 14px; }

/* Upload Progress */
.upload-progress {
  display: flex;
  flex-direction: column;
  gap: 8px;
  animation: slideIn 0.3s ease;
}

.progress-bar {
  height: 3px;
  background: var(--surface);
  border-radius: 99px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--cyan), var(--violet2));
  border-radius: 99px;
  transition: width 0.4s ease;
  box-shadow: 0 0 8px var(--cyan);
}

.progress-label {
  color: var(--text2);
  font-size: 11px;
}

/* Mode indicator */
.mode-indicator {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-top: auto;
}

.mode-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
}

.mode-dot.general { background: var(--violet2); box-shadow: 0 0 6px var(--violet2); }
.mode-dot.rag     { background: var(--cyan);    box-shadow: 0 0 6px var(--cyan); }

.mode-text {
  font-size: 11px;
  color: var(--text2);
  letter-spacing: 0.5px;
}

/* Sidebar footer */
.sidebar-footer {
  padding: 14px 20px;
  border-top: 1px solid var(--border);
}

.model-badge {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 11px;
  color: var(--text2);
}

.badge-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 5px var(--green);
  animation: pulse 2s infinite;
}

/* ============================================================
   MAIN CHAT
   ============================================================ */
.chat-main {
  margin-left: var(--sidebar-w);
  height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 5;
}

/* Top bar */
.chat-topbar {
  padding: 20px 32px 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(8,11,16,0.8);
  backdrop-filter: blur(12px);
  flex-shrink: 0;
}

.topbar-title {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--violet2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 0.3px;
}

.topbar-sub {
  font-size: 11px;
  color: var(--text2);
  margin-top: 2px;
  letter-spacing: 0.8px;
}

/* Messages */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 28px 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  scroll-behavior: smooth;
}

.chat-messages::-webkit-scrollbar { width: 4px; }
.chat-messages::-webkit-scrollbar-track { background: transparent; }
.chat-messages::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 99px; }

/* Welcome Screen */
.welcome-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 16px;
  padding: 48px 20px;
  animation: fadeUp 0.6s ease both;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.welcome-glyph {
  width: 80px; height: 80px;
  filter: drop-shadow(0 0 16px rgba(0,245,255,0.3));
  animation: spin-slow 20s linear infinite;
}

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

.welcome-title {
  font-family: var(--font-head);
  font-size: 28px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--cyan), var(--violet2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.welcome-sub {
  color: var(--text2);
  font-size: 13px;
  line-height: 1.7;
  max-width: 420px;
}

.welcome-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 4px;
}

.chip {
  background: var(--surface);
  border: 1px solid var(--border2);
  color: var(--text3);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 6px 14px;
  border-radius: 99px;
  cursor: pointer;
  transition: all 0.2s;
}

.chip:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(0,245,255,0.05);
  box-shadow: 0 0 12px rgba(0,245,255,0.12);
}

/* Message bubbles */
.message {
  display: flex;
  flex-direction: column;
  gap: 6px;
  animation: fadeUp 0.35s ease both;
  max-width: 820px;
}

.message.user { align-self: flex-end; align-items: flex-end; }
.message.assistant { align-self: flex-start; align-items: flex-start; }

.msg-label {
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--text2);
  padding: 0 4px;
}

.msg-bubble {
  padding: 14px 18px;
  border-radius: 14px;
  line-height: 1.7;
  font-size: 13.5px;
  position: relative;
  max-width: 100%;
}

.message.user .msg-bubble {
  background: linear-gradient(135deg, rgba(124,58,237,0.25), rgba(168,85,247,0.15));
  border: 1px solid rgba(168,85,247,0.3);
  color: var(--text);
  border-top-right-radius: 4px;
}

.message.assistant .msg-bubble {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  border-top-left-radius: 4px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.3);
}

/* Markdown inside assistant bubble */
.msg-bubble h2 {
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan);
  margin: 14px 0 6px;
  letter-spacing: 0.3px;
}

.msg-bubble h3 {
  font-size: 13px;
  color: var(--violet2);
  margin: 10px 0 4px;
}

.msg-bubble table {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0;
  font-size: 12px;
}

.msg-bubble th {
  background: rgba(0,245,255,0.06);
  color: var(--cyan);
  padding: 7px 10px;
  text-align: left;
  border: 1px solid var(--border);
  font-weight: 500;
}

.msg-bubble td {
  padding: 6px 10px;
  border: 1px solid var(--border);
  color: var(--text3);
  vertical-align: top;
}

.msg-bubble td:first-child { color: var(--violet2); font-weight: 600; }

.msg-bubble strong { color: var(--text); }

.msg-bubble em { color: var(--cyan); font-style: normal; }

.msg-bubble hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 12px 0;
}

.msg-bubble p { margin: 6px 0; }

.msg-bubble ul, .msg-bubble ol {
  padding-left: 20px;
  margin: 6px 0;
  color: var(--text3);
}

.msg-bubble li { margin: 3px 0; }

.msg-bubble code {
  background: rgba(0,245,255,0.07);
  color: var(--cyan);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 12px;
}

/* Source tag */
.source-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 10px;
  color: var(--green);
  background: rgba(34,211,165,0.07);
  border: 1px solid rgba(34,211,165,0.2);
  border-radius: 99px;
  padding: 3px 9px;
  margin-top: 4px;
  letter-spacing: 0.5px;
}

/* Typing indicator */
.typing-indicator {
  display: flex;
  gap: 5px;
  align-items: center;
  padding: 14px 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  border-top-left-radius: 4px;
  width: fit-content;
}

.typing-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  animation: bounce 1.2s infinite;
}

.typing-dot:nth-child(2) { animation-delay: 0.2s; background: var(--violet2); }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
  0%, 60%, 100% { transform: translateY(0);    opacity: 0.4; }
  30%            { transform: translateY(-7px); opacity: 1; }
}

/* ============================================================
   INPUT AREA
   ============================================================ */
.chat-input-area {
  padding: 16px 32px 22px;
  border-top: 1px solid var(--border);
  background: rgba(8,11,16,0.85);
  backdrop-filter: blur(14px);
  flex-shrink: 0;
}

.input-wrapper {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: 16px;
  padding: 10px 12px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.input-wrapper:focus-within {
  border-color: rgba(0,245,255,0.35);
  box-shadow: 0 0 20px rgba(0,245,255,0.08);
}

.attach-btn {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  background: none;
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text2);
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.2s;
}

.attach-btn:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(0,245,255,0.05);
}

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

textarea#user-input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.5;
  resize: none;
  max-height: 180px;
  overflow-y: auto;
  padding: 4px 0;
  caret-color: var(--cyan);
}

textarea#user-input::placeholder { color: var(--text2); }

textarea#user-input::-webkit-scrollbar { width: 3px; }
textarea#user-input::-webkit-scrollbar-thumb { background: var(--border); border-radius: 99px; }

.send-btn {
  width: 38px; height: 38px;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  border: none;
  border-radius: 11px;
  color: #fff;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: all 0.2s;
  box-shadow: 0 0 14px rgba(0,245,255,0.25);
}

.send-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 0 20px rgba(0,245,255,0.4);
}

.send-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

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

.input-hint {
  font-size: 11px;
  color: var(--text2);
  text-align: center;
  margin-top: 8px;
  letter-spacing: 0.3px;
  transition: color 0.3s;
}

.input-hint.rag-mode { color: var(--cyan); }

/* ============================================================
   TOAST
   ============================================================ */
.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--surface2);
  border: 1px solid var(--border2);
  color: var(--text);
  font-size: 13px;
  padding: 10px 20px;
  border-radius: 10px;
  z-index: 999;
  opacity: 0;
  transition: all 0.3s ease;
  white-space: nowrap;
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast.error  { border-color: rgba(248,113,113,0.4); color: var(--red); }
.toast.success{ border-color: rgba(34,211,165,0.4);  color: var(--green); }

/* ============================================================
   MOBILE HAMBURGER TOGGLE
   ============================================================ */
.hamburger {
  display: none;
  background: none;
  border: 1px solid var(--border2);
  border-radius: 8px;
  color: var(--text3);
  cursor: pointer;
  padding: 6px 8px;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.2s;
}
.hamburger:hover { border-color: var(--cyan); color: var(--cyan); }
.hamburger svg { width: 18px; height: 18px; }

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  z-index: 9;
  backdrop-filter: blur(2px);
}
.sidebar-overlay.active { display: block; }

/* ============================================================
   RESPONSIVE — TABLET (≤ 768px)
   ============================================================ */
@media (max-width: 768px) {

  /* Sidebar slides in/out as a drawer */
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 20;
    width: 280px;
  }
  .sidebar.open { transform: translateX(0); }

  /* Main takes full width */
  .chat-main { margin-left: 0; }

  /* Show hamburger in topbar */
  .hamburger { display: flex; }

  /* Topbar layout: hamburger + title */
  .chat-topbar {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px 12px;
  }

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

  .topbar-title { font-size: 15px; }
  .topbar-sub   { font-size: 10px; }

  /* Chat messages padding */
  .chat-messages { padding: 20px 14px; gap: 16px; }

  /* Input area */
  .chat-input-area { padding: 10px 14px 16px; }

  /* Welcome screen */
  .welcome-screen { padding: 32px 12px; gap: 12px; }
  .welcome-title  { font-size: 22px; }
  .welcome-sub    { font-size: 12px; }
  .welcome-glyph  { width: 60px; height: 60px; }

  .welcome-chips { gap: 6px; }
  .chip { font-size: 11px; padding: 5px 12px; }

  /* Message bubbles */
  .msg-bubble { font-size: 13px; padding: 12px 14px; }
  .msg-bubble table { font-size: 11px; }

  /* Toast */
  .toast { font-size: 12px; padding: 8px 16px; bottom: 20px; max-width: 90vw; white-space: normal; text-align: center; }
}

/* ============================================================
   RESPONSIVE — SMALL PHONES (≤ 480px)
   ============================================================ */
@media (max-width: 480px) {
  .chat-messages { padding: 16px 10px; }
  .chat-input-area { padding: 8px 10px 14px; }
  .input-wrapper { padding: 8px 10px; gap: 8px; }
  .attach-btn { width: 32px; height: 32px; }
  .send-btn   { width: 34px; height: 34px; }
  textarea#user-input { font-size: 13px; }
  .welcome-title { font-size: 20px; }
  .msg-bubble { font-size: 12.5px; padding: 10px 12px; }
}

/* ============================================================
   TABLE DOWNLOAD BUTTON + DROPDOWN
   ============================================================ */
.table-dl-wrap {
  position: absolute;
  top: 10px;
  right: 10px;
  display: inline-block;
  z-index: 10;
}

.table-dl-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px; height: 32px;
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: 8px;
  color: var(--text3);
  cursor: pointer;
  transition: all 0.2s ease;
}

.table-dl-icon-btn svg {
  width: 15px; height: 15px;
}

.table-dl-icon-btn:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(0,245,255,0.06);
  box-shadow: 0 0 10px rgba(0,245,255,0.15);
}

.table-dl-dropdown {
  display: none;
  position: absolute;
  right: 0;
  left: auto; 
  top: calc(100% + 6px);
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: 10px;
  overflow: hidden;
  z-index: 100;
  min-width: 160px;
  box-shadow: 0 8px 28px rgba(0,0,0,0.5);
  animation: dropIn 0.15s ease;
}

@keyframes dropIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.table-dl-wrap.open .table-dl-dropdown { display: block; }

.table-dl-option {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 9px 14px;
  background: none;
  border: none;
  color: var(--text3);
  font-family: var(--font-mono);
  font-size: 12px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  text-align: left;
  letter-spacing: 0.3px;
}

.table-dl-option svg {
  width: 13px; height: 13px;
  flex-shrink: 0;
}

.table-dl-option:hover                    { background: rgba(0,245,255,0.06);    color: var(--cyan); }
.table-dl-option[data-fmt="xlsx"]:hover   { background: rgba(34,211,165,0.06);   color: var(--green); }
.table-dl-option[data-fmt="pdf"]:hover    { background: rgba(248,113,113,0.06);  color: var(--red); }
.table-dl-option[data-fmt="png"]:hover    { background: rgba(168,85,247,0.06);   color: var(--violet2); }

.table-dl-option + .table-dl-option {
  border-top: 1px solid var(--border);
}

/* ============================================================
   COPY BAR
   ============================================================ */
.copy-bar {
  display: flex;
  align-items: center;
  padding: 2px 4px 0;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px; height: 28px;
  background: none;
  border: none;
  border-radius: 7px;
  color: var(--text2);
  cursor: pointer;
  transition: all 0.2s ease;
}

.copy-btn svg {
  width: 14px; height: 14px;
}

.copy-btn:hover {
  color: var(--cyan);
  background: rgba(0,245,255,0.06);
}

.copy-btn.copied {
  color: var(--green);
}