@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700&display=swap');

/* ============================================================
   NexBot — AI FAQ Assistant
   Design: Soft Cream + Black | Dark Mode Support
   ============================================================ */

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

/* ── Light Mode Variables ── */
:root {
  --bg-primary:    #FFFFFF;
  --bg-secondary:  #F3EADB;   /* Soft Cream */
  --bg-card:       #FFFFFF;
  --bg-hover:      #E8DDD0;
  --bg-input:      #FFFFFF;

  --accent:        #C2662A;
  --accent-hover:  #A85420;
  --accent-light:  rgba(194,102,42,0.08);

  --text-primary:  #111111;   /* Black */
  --text-secondary:#4A4238;
  --text-subtle:   #9C8E82;

  --border:        #DDD3C4;
  --border-light:  #EAE0D3;
  --border-hover:  #C8BAA8;

  --sidebar-width: 320px;
  --topbar-height: 56px;
  --transition:    0.22s ease;
  --radius:        10px;
  --font:          'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --shadow-sm:  0 1px 3px rgba(0,0,0,0.06);
  --shadow-md:  0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg:  0 12px 32px rgba(0,0,0,0.10);
}

/* ── Dark Mode Variables ── */
[data-theme="dark"] {
  --bg-primary:    #1A1A1A;
  --bg-secondary:  #212121;
  --bg-card:       #2A2A2A;
  --bg-hover:      #333333;
  --bg-input:      #2A2A2A;

  --accent:        #E8824A;
  --accent-hover:  #D06030;
  --accent-light:  rgba(232,130,74,0.12);

  --text-primary:  #F0EDE8;
  --text-secondary:#B8B0A8;
  --text-subtle:   #7A7268;

  --border:        #383830;
  --border-light:  #2E2E28;
  --border-hover:  #4A4840;

  --shadow-sm:  0 1px 3px rgba(0,0,0,0.30);
  --shadow-md:  0 4px 12px rgba(0,0,0,0.40);
  --shadow-lg:  0 12px 32px rgba(0,0,0,0.50);
}

/* ── Base ── */
html { height: 100%; }

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  height: 100%;
  overflow: hidden;
  line-height: 1.5;
  transition: background var(--transition), color var(--transition);
}

button {
  font-family: var(--font);
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
  transition: all var(--transition);
}

input, textarea, select {
  font-family: var(--font);
  color: var(--text-primary);
}

/* ============================================================
   App Layout
   ============================================================ */

.app {
  display: flex;
  height: 100vh;
  height: 100dvh;
  width: 100%;
  overflow: hidden;
  position: relative;
}

/* ============================================================
   Sidebar Overlay
   ============================================================ */

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.35);
  backdrop-filter: blur(2px);
  z-index: 150;
  opacity: 0;
  transition: opacity var(--transition);
}

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

/* ============================================================
   Sidebar
   ============================================================ */

.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  z-index: 200;
  flex-shrink: 0;
  overflow: hidden;
  transition:
    width 0.28s cubic-bezier(0.4,0,0.2,1),
    min-width 0.28s cubic-bezier(0.4,0,0.2,1),
    transform 0.28s cubic-bezier(0.4,0,0.2,1),
    border-color 0.28s ease;
}

/* Desktop collapsed state */
.sidebar.collapsed {
  width: 0 !important;
  min-width: 0 !important;
  border-right-color: transparent;
}

/* Sidebar Header */
.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 16px 16px;
}

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

.logo-img {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.logo-text {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.3px;
  white-space: nowrap;
}

.logo-text .accent { color: inherit; }

/* Close button — mobile only */
.sidebar-close-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  color: var(--text-secondary);
  flex-shrink: 0;
}

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

/* Sidebar scrollable area */
.sidebar-top {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 0 12px 12px;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.new-chat-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border-hover);
  border-radius: 9px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
  margin-bottom: 20px;
  white-space: nowrap;
}

.new-chat-btn:hover {
  background: var(--bg-hover);
  border-color: var(--border);
}

.recent-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-subtle);
  padding: 0 4px;
  margin-bottom: 6px;
  white-space: nowrap;
}

.chat-history {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.history-item {
  display: flex;
  align-items: center;
  padding: 9px 12px;
  border-radius: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  text-align: left;
  width: 100%;
  overflow: hidden;
  white-space: nowrap;
}

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

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

/* Footer */
.sidebar-bottom {
  padding: 12px 4px;
  border-top: 1px solid var(--border);
  font-size: 8.5px;
  font-weight: 700;
  color: var(--text-subtle);
  text-align: center;
  flex-shrink: 0;
  white-space: nowrap;
  letter-spacing: -0.2px;
}

/* ============================================================
   Main Area
   ============================================================ */

.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-primary);
  min-width: 0;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  transition: background var(--transition);
}

/* ============================================================
   Top Bar
   ============================================================ */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--topbar-height);
  min-height: var(--topbar-height);
  padding: 0 16px;
  border-bottom: 1px solid var(--border-light);
  background: var(--bg-primary);
  z-index: 10;
  transition: background var(--transition), border-color var(--transition);
}

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

.topbar-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 45vw; /* Prevents it from crushing the actions on right */
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Universal topbar button */
.topbar-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 9px;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  flex-shrink: 0;
  transition: background var(--transition), color var(--transition);
}

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

.topbar-btn svg {
  display: block;
  flex-shrink: 0;
}

/* Dark mode icon toggling */
[data-theme="light"] .icon-sun  { display: none; }
[data-theme="light"] .icon-moon { display: block; }
[data-theme="dark"]  .icon-sun  { display: block; }
[data-theme="dark"]  .icon-moon { display: none; }

/* ============================================================
   View Container
   ============================================================ */

.view-container {
  display: none;
  flex: 1;
  flex-direction: column;
  overflow: hidden;
  height: calc(100vh - var(--topbar-height));
  height: calc(100dvh - var(--topbar-height));
}

.view-container.active {
  display: flex;
}

/* ============================================================
   Chat Container
   ============================================================ */

.chat-container {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  scroll-behavior: smooth;
}

/* Scrollbar */
.chat-container::-webkit-scrollbar { width: 6px; }
.chat-container::-webkit-scrollbar-track { background: transparent; }
.chat-container::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

/* ── Welcome Screen ── */
.welcome {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  padding: 48px 24px 24px;
  text-align: center;
  animation: fadeUp 0.4s ease;
  max-width: 680px;
  margin: 0 auto;
  width: 100%;
}

.welcome.hidden { display: none; }

.welcome-logo { margin-bottom: 24px; }

.welcome-logo-img {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  object-fit: cover;
  box-shadow: var(--shadow-md);
}

.welcome-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
  letter-spacing: -0.5px;
}

.welcome-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 36px;
}

/* Suggestion cards */
.suggestions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  width: 100%;
}

.suggestion-card {
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 14px;
  color: var(--text-secondary);
  text-align: left;
  line-height: 1.5;
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.suggestion-card:hover {
  border-color: var(--accent);
  background: var(--accent-light);
  color: var(--text-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ── Messages ── */
.messages {
  display: none;
  flex-direction: column;
  padding: 24px 0 16px;
  max-width: 780px;
  width: 100%;
  margin: 0 auto;
}

.messages.active { display: flex; }

.message {
  display: flex;
  gap: 14px;
  padding: 20px 24px;
  animation: fadeUp 0.3s ease;
}

.message:hover { background: var(--accent-light); }

/* Avatars */
.message-avatar {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
}

.message.user .message-avatar {
  background: var(--text-primary);
  color: var(--bg-primary);
}

/* Bot avatar with NexBot logo */
.message.bot .message-avatar {
  background: var(--bg-secondary);
  border: 1.5px solid var(--border);
  padding: 0;
  overflow: hidden;
}

.message.bot .message-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Message content */
.message-content {
  flex: 1;
  min-width: 0;
  padding-top: 4px;
}

.message-header {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.message-time {
  font-size: 12px;
  font-weight: 400;
  color: var(--text-subtle);
}

.message-text {
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-primary);
}

/* Typing dots */
.typing-dots {
  display: flex;
  gap: 5px;
  align-items: center;
  height: 24px;
  padding: 4px 0;
}

.typing-dots span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--text-subtle);
  animation: bounce 1.4s infinite ease-in-out both;
}

.typing-dots span:nth-child(1) { animation-delay: -0.32s; }
.typing-dots span:nth-child(2) { animation-delay: -0.16s; }

/* ============================================================
   Markdown Body (ChatGPT/Claude style)
   ============================================================ */

.markdown-body { font-size: 15px; line-height: 1.7; color: var(--text-primary); }

.markdown-body p { margin: 0 0 12px 0; }
.markdown-body p:last-child { margin-bottom: 0; }

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  font-weight: 700;
  color: var(--text-primary);
  margin: 20px 0 8px;
  line-height: 1.3;
}

.markdown-body h1 { font-size: 20px; }
.markdown-body h2 { font-size: 18px; }
.markdown-body h3 { font-size: 16px; border-bottom: 1px solid var(--border); padding-bottom: 4px; }
.markdown-body h4 { font-size: 15px; }

.markdown-body strong { font-weight: 700; color: var(--text-primary); }
.markdown-body em { font-style: italic; }

.markdown-body ul,
.markdown-body ol { margin: 8px 0 12px 0; padding-left: 22px; }

.markdown-body li { margin-bottom: 5px; line-height: 1.6; }

.markdown-body code {
  background: var(--bg-hover);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 13px;
  font-family: 'Fira Code', 'Courier New', monospace;
  color: var(--accent);
}

.markdown-body pre {
  background: #1C1917;
  border-radius: 10px;
  padding: 16px 20px;
  overflow-x: auto;
  margin: 12px 0;
}

.markdown-body pre code {
  background: transparent;
  border: none;
  padding: 0;
  color: #F5F5F4;
  font-size: 13px;
}

.markdown-body blockquote {
  border-left: 3px solid var(--accent);
  margin: 12px 0;
  padding: 8px 16px;
  background: var(--accent-light);
  border-radius: 0 8px 8px 0;
  color: var(--text-secondary);
}

.markdown-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 16px 0;
}

.markdown-body a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.markdown-body a:hover { color: var(--accent-hover); }

.markdown-body table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 14px; }
.markdown-body th,
.markdown-body td { padding: 8px 12px; border: 1px solid var(--border); text-align: left; }
.markdown-body th { background: var(--bg-hover); font-weight: 600; }

/* ============================================================
   Input Area
   ============================================================ */

.input-area {
  padding: 0 20px 20px;
  background: var(--bg-primary);
  flex-shrink: 0;
  transition: background var(--transition);
}

.input-wrapper { max-width: 780px; margin: 0 auto; }

.input-container {
  display: flex;
  align-items: flex-end;
  background: var(--bg-input);
  border: 1.5px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow-md);
  padding: 8px 10px;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

.input-container:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light), var(--shadow-md);
}

.message-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  resize: none;
  padding: 6px 8px;
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.5;
  max-height: 200px;
  overflow-y: auto;
}

.message-input::placeholder { color: var(--text-subtle); }

.send-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 9px;
  color: #fff;
  background: var(--accent);
  flex-shrink: 0;
  margin-left: 4px;
  transition: all var(--transition);
}

.send-btn:disabled {
  background: var(--border);
  color: var(--text-subtle);
  cursor: not-allowed;
}

.send-btn:not(:disabled):hover {
  background: var(--accent-hover);
  transform: scale(1.05);
}

.disclaimer {
  text-align: center;
  font-size: 12px;
  color: var(--text-subtle);
  margin-top: 8px;
  line-height: 1.4;
  letter-spacing: 0.1px;
}

/* ============================================================
   Animations
   ============================================================ */

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

@keyframes bounce {
  0%, 80%, 100% { transform: translateY(0); }
  40%           { transform: translateY(-5px); }
}

/* ============================================================
   Mobile Responsive
   ============================================================ */

/* Tablet */
@media (max-width: 900px) {
  /* Sidebar width now strictly inherits 320px to prevent footer cutoffs */
}

/* Mobile */
@media (max-width: 768px) {
  :root {
    --topbar-height: 52px;
  }

  /* Sidebar: slide in as full-height overlay */
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
    z-index: 200;
    width: var(--sidebar-width) !important;
    min-width: var(--sidebar-width) !important;
    box-shadow: 4px 0 32px rgba(0,0,0,0.15);
    /* Use transform for mobile open/close */
    transform: translateX(-100%);
    transition: transform 0.28s cubic-bezier(0.4,0,0.2,1);
  }

  /* On mobile, open = translate to 0 */
  .sidebar.mobile-open {
    transform: translateX(0);
  }

  /* Desktop collapsed overrides don't apply on mobile */
  .sidebar.collapsed {
    width: var(--sidebar-width) !important;
    min-width: var(--sidebar-width) !important;
    transform: translateX(-100%);
  }

  /* Show close button inside sidebar on mobile */
  .sidebar-close-btn {
    display: flex;
  }

  /* Main area: always full width */
  .main {
    width: 100%;
    min-width: 0;
  }

  /* Topbar */
  .topbar { padding: 0 10px; }

  .topbar-btn {
    width: 40px;
    height: 40px;
  }

  /* Messages */
  .messages {
    max-width: 100%;
    padding: 16px 0 8px;
  }

  .message {
    padding: 14px 14px;
    gap: 10px;
  }

  .message-text,
  .markdown-body { font-size: 14px; }

  /* Welcome */
  .welcome {
    padding: 32px 16px 16px;
  }

  .welcome-title { font-size: 22px; }
  .welcome-subtitle { font-size: 14px; margin-bottom: 24px; }

  /* 1-column suggestions on mobile */
  .suggestions {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  /* Input */
  .input-area { padding: 0 10px 16px; }

  .message-input {
    font-size: 16px; /* Prevents iOS auto-zoom */
  }
}

/* Small phones */
@media (max-width: 420px) {
  .welcome-title { font-size: 19px; }
  .topbar-title { display: none; } /* Hide title text, show only icon on tiny screens */
  .message { padding: 12px 10px; }
  .input-area { padding: 0 8px 12px; }
}