:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  --bg-card: #ffffff;
  --text-primary: #09090b;
  --text-secondary: #71717a;
  --text-tertiary: #a1a1aa;
  --accent-primary: #20808d;
  --accent-hover: #2a9aa8;
  --accent-light: #e0f2f4;
  --border-color: #e4e4e7;
  --border-light: #f4f4f5;
  --error-bg: #fee2e2;
  --error-text: #dc2626;
  --success-bg: #dcfce7;
  --success-text: #16a34a;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 25px 50px rgba(0, 0, 0, 0.25);
  --max-content-width: 48rem;
  --input-height: 80px;
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.18);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #18181b;
    --bg-tertiary: #27272a;
    --bg-card: #18181b;
    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-tertiary: #71717a;
    --accent-primary: #20808d;
    --accent-hover: #2a9aa8;
    --accent-light: #1a3a3f;
    --border-color: #3f3f46;
    --border-light: #27272a;
    --error-bg: #3d1f1f;
    --error-text: #ff6b6b;
    --success-bg: #1f3d2f;
    --success-text: #4ade80;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 8px 16px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.7);
    --shadow-xl: 0 30px 60px rgba(0, 0, 0, 0.8);
    --glass-bg: rgba(24, 24, 27, 0.7);
    --glass-border: rgba(63, 63, 70, 0.3);
  }
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* Premium Background Texture */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(32, 128, 141, 0.03) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(32, 128, 141, 0.03) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

.chat-messages::-webkit-scrollbar {
  width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
  background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
  transition: background 0.3s;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
  background: var(--accent-primary);
}

.chat-messages {
  scrollbar-width: thin;
  scrollbar-color: var(--border-color) transparent;
}

/* Modal Styles - Enhanced */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.3s ease;
}

.modal.hidden {
  display: none;
}

.modal-content {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border-radius: 20px;
  max-width: 500px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  animation: modalSlideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-xl);
}

.modal-header {
  padding: 1.75rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-secondary);
  border-radius: 20px 20px 0 0;
}

.modal-header h2 {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.close-modal {
  background: var(--bg-tertiary);
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.close-modal:hover {
  background: var(--accent-primary);
  color: white;
  transform: rotate(90deg);
}

.modal-body {
  padding: 2rem;
}

.setting-item {
  margin-bottom: 1.75rem;
}

.setting-item label {
  display: block;
  margin-bottom: 0.625rem;
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.setting-item input[type="password"],
.setting-item input[type="text"] {
  width: 100%;
  padding: 0.875rem 1rem;
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: 12px;
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.setting-item input:focus {
  outline: none;
  border-color: var(--accent-primary);
  background: var(--bg-card);
  box-shadow: 0 0 0 4px rgba(32, 128, 141, 0.1);
}

.setting-item small {
  display: block;
  margin-top: 0.625rem;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.setting-item small a {
  color: var(--accent-primary);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s;
}

.setting-item small a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.modal-footer {
  padding: 1.75rem;
  border-top: 1px solid var(--border-color);
  background: var(--bg-secondary);
  border-radius: 0 0 20px 20px;
}

.btn-primary {
  width: 100%;
  padding: 1rem;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-hover));
  color: white;
  border: none;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 12px rgba(32, 128, 141, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(32, 128, 141, 0.4);
}

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

/* Chat Container */
.chat-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: relative;
  z-index: 1;
}

/* Header - Enhanced with glassmorphism */
.chat-header {
  padding: 1.25rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  stroke: var(--accent-primary);
  flex-shrink: 0;
  filter: drop-shadow(0 2px 4px rgba(32, 128, 141, 0.3));
}

.logo .logo-title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  letter-spacing: -0.03em;
}

@media (prefers-color-scheme: dark) {
  .logo .logo-title {
    background: linear-gradient(135deg, var(--accent-primary), #4ade80);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }
}

.settings-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.625rem;
  border-radius: 12px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
}

.settings-btn:hover {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.settings-btn svg {
  stroke: currentColor;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.settings-btn:hover svg {
  transform: rotate(90deg);
}

/* Header Actions Container */
.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* Donate Button */
.donate-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 0.875rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 12px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-sm);
    font-size: 0.925rem;
    font-weight: 600;
}

.donate-btn:hover {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.donate-btn svg {
    stroke: currentColor;
    flex-shrink: 0;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.donate-btn:hover svg {
    transform: scale(1.1);
}

/* Mobile responsive */
@media (max-width: 768px) {
    .donate-text {
        display: none;
    }
    
    .donate-btn {
        padding: 0.625rem;
    }
    
    .header-actions {
        gap: 0.5rem;
    }
}

/* Chat Messages */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 0;
  scroll-behavior: smooth;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--bg-primary);
}

.chat-messages:not(.has-welcome) {
  padding: 0;
  padding-bottom: calc(var(--input-height) + 8rem);
}

/* Welcome Screen - Premium redesign */
.welcome-screen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: var(--input-height);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.6s ease;
    z-index: 1;
    pointer-events: none;
    overflow-y: auto; /* Allow scrolling if needed */
}

.welcome-content {
    max-width: 650px;
    width: 100%;
    padding: 2rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: clamp(1.5rem, 4vh, 3.5rem); /* Responsive gap */
}

.welcome-heading {
    font-size: clamp(2rem, 8vw, 4.5rem); /* Responsive font size */
    font-weight: 800;
    margin-bottom: 0; /* Remove fixed margin */
    color: var(--text-primary);
    letter-spacing: -0.05em;
    line-height: 1;
    text-shadow: 0 2px 20px rgba(32, 128, 141, 0.1);
}

@media (prefers-color-scheme: dark) {
    .welcome-heading {
        background: linear-gradient(135deg, var(--text-primary), var(--accent-primary), #4ade80);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }
}

.welcome-disclaimer {
    display: flex;
    align-items: flex-start;
    gap: clamp(0.75rem, 2vw, 1.25rem); /* Responsive gap */
    padding: clamp(1rem, 2.5vh, 1.75rem); /* Responsive padding */
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    text-align: left;
    box-shadow: var(--shadow-lg);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.welcome-disclaimer:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.disclaimer-icon {
    flex-shrink: 0;
    width: clamp(24px, 4vw, 28px); /* Responsive icon size */
    height: clamp(24px, 4vw, 28px);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(245, 158, 11, 0.1);
    border-radius: 8px;
    padding: 4px;
}

.disclaimer-icon svg {
    stroke: #f59e0b;
    width: clamp(18px, 3vw, 20px);
    height: clamp(18px, 3vw, 20px);
}

.disclaimer-content {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
}

.disclaimer-title {
    font-size: clamp(0.9rem, 1.8vw, 1.05rem); /* Responsive title */
    font-weight: 700;
    color: var(--text-primary);
}

.disclaimer-desc {
    font-size: clamp(0.8rem, 1.6vw, 0.925rem); /* Responsive description */
    color: var(--text-secondary);
    line-height: 1.65;
}

/* Message Container - Enhanced */
.message {
  width: 100%;
  max-width: var(--max-content-width);
  margin-bottom: 0.75rem;
  padding: 0 1.5rem;
  animation: messageSlideIn 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.message-user {
  padding: 0 2rem;
  margin-bottom: 0.75rem;
}

.message-assistant {
  margin-bottom: 2rem;
}

/* User Message - Enhanced */
.message-user {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  position: relative;
}

.message-user .message-content {
  background: transparent;
  color: var(--text-primary);
  padding: 0;
  border-radius: 0;
  width: 100%;
  word-wrap: break-word;
  white-space: pre-wrap;
  font-size: 1rem;
  position: relative;
  line-height: 1.7;
  font-weight: 500;
}

/* User Action Buttons - Enhanced */
.user-message-actions {
  position: relative;
  right: auto;
  bottom: auto;
  display: flex;
  gap: 0.5rem;
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  margin-top: 0rem;
  justify-content: flex-end;
  pointer-events: none;
}

.message-user:not(.editing):hover .user-message-actions,
.message-user.active .user-message-actions {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.message-user:not(.editing):hover .user-message-actions {
  display: flex;
  opacity: 1;
}

.user-action-btn {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  padding: 0.5rem 0.625rem;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
}

.user-action-btn:hover {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.user-action-btn svg {
  stroke: currentColor;
}

.user-action-btn.copied {
  background: var(--success-bg);
  color: var(--success-text);
  border-color: var(--success-text);
}

/* Edit Mode - Enhanced */
.message-user.editing .message-content {
  background: transparent;
  border: none;
  padding: 0;
}

.edit-wrapper {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  width: 100%;
}

.edit-textarea {
  width: 100%;
  padding: 1rem 1.25rem;
  background: var(--bg-secondary);
  border: 2px solid var(--accent-primary);
  border-radius: 12px;
  color: var(--text-primary);
  font-size: 0.975rem;
  font-family: inherit;
  resize: none;
  max-height: 180px;
  line-height: 1.6;
  box-shadow: 0 0 0 4px rgba(32, 128, 141, 0.1);
}

.edit-textarea:focus {
  outline: none;
}

.edit-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.625rem;
}

.edit-action-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 0.625rem 1.25rem;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  color: var(--text-primary);
  font-size: 0.925rem;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.edit-action-btn:hover {
  background: var(--bg-tertiary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.edit-action-btn.cancel-btn {
  color: var(--error-text);
  border-color: var(--error-text);
}

.edit-action-btn.cancel-btn:hover {
  background: var(--error-bg);
}

.edit-action-btn.confirm-btn {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-hover));
  color: white;
  border-color: transparent;
  box-shadow: 0 4px 12px rgba(32, 128, 141, 0.3);
}

.edit-action-btn.confirm-btn:hover {
  box-shadow: 0 6px 20px rgba(32, 128, 141, 0.4);
}

/* Assistant Message - Enhanced */
.message-assistant {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.message-assistant .message-content {
  background: transparent;
  padding: 0;
  width: 100%;
  color: var(--text-primary);
}

/* Response Tabs - Enhanced */
.response-tabs {
  display: flex;
  gap: 0.25rem;
  margin-bottom: 1.25rem;
  border-bottom: 2px solid var(--border-color);
  background: var(--bg-secondary);
  padding: 0.5rem;
  border-radius: 12px 12px 0 0;
}

.response-tab {
  background: transparent;
  border: none;
  padding: 0.75rem 1.25rem;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 0.925rem;
  font-weight: 600;
  border-radius: 8px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.response-tab:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

.response-tab.active {
  color: var(--accent-primary);
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

/* Response Content - Enhanced typography */
.response-content h3 {
  margin-top: 2rem;
  margin-bottom: 1rem;
  font-size: 1.25rem;
  color: var(--text-primary);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.response-content p {
  margin-bottom: 1.25rem;
  line-height: 1.8;
  color: var(--text-primary);
  font-size: 1rem;
}

.response-content ul, .response-content ol {
  margin-left: 1.75rem;
  margin-bottom: 1.25rem;
}

.response-content li {
  margin-bottom: 0.75rem;
  color: var(--text-primary);
  line-height: 1.7;
}

.response-content code {
  background: transparent; /* Removes the highlight */
  color: inherit;          /* Makes text color the same as the paragraph */
  font-family: inherit;    /* Matches the surrounding font */
  font-size: inherit;      /* Matches the surrounding font size */
  padding: 0;              /* Removes extra spacing */
  border-radius: 0;        /* Removes rounded corners */
  border: none;            /* Removes the border */
}

.response-content blockquote {
  border-left: 4px solid var(--accent-primary);
  padding-left: 1.25rem;
  margin: 1.25rem 0;
  color: var(--text-secondary);
  font-style: italic;
  background: var(--bg-secondary);
  padding: 1rem 1.25rem;
  border-radius: 0 8px 8px 0;
}

.response-content a {
  color: var(--accent-primary);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.2s;
}

.response-content a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.inline-citation {
  color: var(--accent-primary);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.2s;
  padding: 0.125rem 0.25rem;
  border-radius: 4px;
}

.inline-citation:hover {
  color: var(--accent-hover);
  background: var(--accent-light);
}

/* Research Steps Display - Enhanced */
.research-steps-display {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  padding-left: 2rem;
  margin-bottom: 2rem;
}

.research-steps-display::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 24px;
  bottom: 24px;
  width: 3px;
  background: linear-gradient(180deg, var(--accent-primary), transparent);
  border-radius: 2px;
}

.research-step-card {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 1.25rem;
  animation: slideIn 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.research-step-card:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

.research-step-card::before {
  content: '';
  position: absolute;
  left: -2rem;
  top: 50%;
  transform: translateY(-50%);
  width: 12px;
  height: 12px;
  background: var(--accent-primary);
  border-radius: 50%;
  border: 3px solid var(--bg-primary);
  z-index: 1;
  box-shadow: 0 0 0 4px rgba(32, 128, 141, 0.2);
}

.research-step-card .step-text {
  color: var(--text-primary);
  font-size: 0.975rem;
  line-height: 1.6;
}

/* Live Research Steps - Enhanced */
.research-steps {
  display: inline-flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.research-step {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border-radius: 12px;
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s;
}

.research-step.completed {
  opacity: 0.6;
  background: var(--bg-secondary);
}

.step-icon {
  width: 20px;
  height: 20px;
  border: 3px solid var(--accent-primary);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  flex-shrink: 0;
  margin-top: 2px;
  box-shadow: 0 0 8px rgba(32, 128, 141, 0.3);
}

.research-step.completed .step-icon {
  border: 3px solid var(--text-tertiary);
  border-top-color: var(--text-tertiary);
  animation: none;
}

.step-text {
  flex: 1;
  font-size: 0.975rem;
  color: var(--text-primary);
  font-weight: 500;
}

.research-step.completed .step-text {
  color: var(--text-secondary);
}

/* Search Status - Enhanced */
.search-status {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border-radius: 12px;
  font-size: 0.975rem;
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-md);
}

.status-spinner {
  width: 20px;
  height: 20px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  box-shadow: 0 0 8px rgba(32, 128, 141, 0.3);
}

/* Source Cards - Premium design */
.sources-grid {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.remaining-sources {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.source-card {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 1.25rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  text-decoration: none;
  display: block;
  box-shadow: var(--shadow-sm);
}

.source-card:hover {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  background: var(--bg-card);
}

.source-card-header {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  margin-bottom: 0.75rem;
}

.source-favicon {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  flex-shrink: 0;
}

.source-domain {
  font-size: 0.825rem;
  color: var(--text-tertiary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.source-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.source-description {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.show-more-sources {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  padding: 0.875rem 1.25rem;
  color: var(--text-primary);
  font-size: 0.925rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  width: 100%;
  margin-top: 0.75rem;
  box-shadow: var(--shadow-sm);
}

.show-more-sources:hover {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Message Action Buttons - Enhanced */
.message-actions {
  display: flex;
  gap: 0.625rem;
  margin-top: 1.25rem;
}

.action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.625rem;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  width: 40px;
  height: 40px;
  box-shadow: var(--shadow-sm);
}

.action-btn:hover {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.action-btn svg {
  stroke: currentColor;
}

.action-btn.copied {
  background: var(--success-bg);
  color: var(--success-text);
  border-color: var(--success-text);
}

/* Regenerate Dropdown - Enhanced */
.regenerate-dropdown {
  position: absolute;
  bottom: calc(100% + 10px);
  left: 0;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  min-width: 200px;
  box-shadow: var(--shadow-xl);
  animation: dropdownSlideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 100;
  overflow: hidden;
}

.regenerate-option {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  cursor: pointer;
  transition: all 0.2s;
  border-bottom: 1px solid var(--border-color);
}

.regenerate-option:last-child {
  border-bottom: none;
}

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

.regenerate-option svg {
  stroke: var(--accent-primary);
  flex-shrink: 0;
}

.regenerate-option span {
  font-size: 0.925rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Scroll to Bottom Button - Enhanced */
.scroll-to-bottom {
  position: fixed;
  bottom: calc(var(--input-height) + 70px);
  left: 50%;
  transform: translateX(-50%);
  width: 48px;
  height: 48px;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-lg);
  z-index: 50;
  color: var(--text-primary);
}

.scroll-to-bottom:hover {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
  transform: translateX(-50%) translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.scroll-to-bottom.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%) translateY(15px);
}

.scroll-to-bottom svg {
  stroke: currentColor;
}

/* Chat Input Wrapper - Enhanced */
.chat-input-wrapper {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: transparent;
  display: flex;
  flex-direction: column;
  align-items: center;
  z-index: 90;
  pointer-events: none;
}

.chat-input-container {
  width: 100%;
  max-width: var(--max-content-width);
  padding: 2rem;
  pointer-events: auto;
}

.input-box {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border-radius: 16px;
  border: 2px solid var(--glass-border);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-xl);
}

.input-box:focus-within {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 4px rgba(32, 128, 141, 0.15), var(--shadow-xl);
  transform: translateY(-2px);
}

.input-text-row {
  padding: 1rem 1rem 0;
}

.input-text-row textarea {
  width: 100%;
  padding: 0.625rem;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1rem;
  resize: none;
  max-height: 180px;
  font-family: inherit;
  line-height: 1.6;
  font-weight: 500;
}

.input-text-row textarea:focus {
  outline: none;
}

.input-text-row textarea::placeholder {
  color: var(--text-tertiary);
}

.input-controls-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0 1rem 1rem;
}

/* Compact layout - Enhanced */
.input-box.compact {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
}

.input-box.compact .input-text-row {
  flex: 1;
  padding: 0;
  order: 2;
}

.input-box.compact .input-controls-row {
  padding: 0;
  width: auto;
  gap: 1rem;
  display: contents;
}

.input-box.compact .workflow-selector {
  order: 1;
}

.input-box.compact .input-actions {
  order: 3;
}

/* Workflow Selector - Enhanced */
.workflow-selector {
  position: relative;
}

.workflow-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 0.75rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-sm);
}

.workflow-btn:hover {
  background: var(--bg-tertiary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.workflow-btn svg.workflow-icon {
  stroke: var(--accent-primary);
}

.workflow-btn svg.chevron {
  stroke: var(--text-secondary);
  width: 14px;
  height: 14px;
}

.workflow-dropdown {
  position: absolute;
  bottom: calc(100% + 10px);
  left: 0;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  min-width: 280px;
  box-shadow: var(--shadow-xl);
  animation: dropdownSlideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 10;
  overflow: hidden;
}

.workflow-dropdown.hidden {
  display: none;
}

.workflow-option {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem;
  cursor: pointer;
  transition: all 0.2s;
  border-bottom: 1px solid var(--border-color);
}

.workflow-option:last-child {
  border-bottom: none;
}

.workflow-option:hover {
  background: var(--bg-secondary);
}

.workflow-option.active {
  background: var(--accent-light);
}

.workflow-option svg {
  stroke: var(--accent-primary);
  flex-shrink: 0;
  margin-top: 2px;
}

.workflow-info {
  flex: 1;
}

.workflow-name {
  font-size: 0.975rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.375rem;
}

.workflow-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Send Button - Premium design */
.send-btn {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-hover));
  border: none;
  color: white;
  border-radius: 10px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 12px rgba(32, 128, 141, 0.4);
  padding: 0.625rem;
}

.send-btn:hover:not(:disabled) {
  transform: scale(1.1);
  box-shadow: 0 6px 20px rgba(32, 128, 141, 0.5);
}

.send-btn:active:not(:disabled) {
  transform: scale(0.95);
}

.send-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  background: var(--text-tertiary);
  box-shadow: none;
}

.send-btn.stop-btn {
  background: linear-gradient(135deg, #dc2626, #ef4444);
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(220, 38, 38, 0.4);
}

.send-btn.stop-btn:hover {
  box-shadow: 0 6px 20px rgba(220, 38, 38, 0.5);
}

/* Animations - Enhanced */
@keyframes fadeIn {
  from { 
    opacity: 0;
  }
  to { 
    opacity: 1;
  }
}

@keyframes modalSlideUp {
  from {
    transform: translateY(40px) scale(0.95);
    opacity: 0;
  }
  to {
    transform: translateY(0) scale(1);
    opacity: 1;
  }
}

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

@keyframes slideIn {
  from {
    transform: translateX(-20px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

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

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

/* Responsive - Mobile Enhanced */
@media (max-width: 768px) {
    .chat-header {
        padding: 1rem;
    }
    
    .logo-icon {
        width: 24px;
        height: 24px;
    }
    
    .logo .logo-title {
        font-size: 1.125rem;
    }
    
    .message {
        padding: 0 1rem;
        margin-bottom: 0.5rem;
    }
    
    .message-user {
        padding: 0 1rem;
        margin-bottom: 0.5rem;
    }
    
    .welcome-content {
        padding: 1rem 1.5rem;
    }
    
    .message-user.active .user-message-actions {
        display: flex;
        opacity: 1;
    }
    
    .scroll-to-bottom {
        bottom: calc(var(--input-height) + 50px);
    }
    
    .chat-input-container {
        padding: 1.25rem;
    }
    
    .chat-messages:not(.has-welcome) {
        padding-bottom: calc(var(--input-height) + 6rem);
    }
}

@media (max-width: 480px) {
    .welcome-content {
        padding: 0.75rem 1rem;
    }
}

/* Landscape orientation fixes for shorter screens */
@media (max-height: 600px) {
    .welcome-content {
        gap: clamp(1rem, 3vh, 2rem);
        padding: 1rem;
    }
    
    .welcome-heading {
        font-size: clamp(1.5rem, 6vw, 3rem);
    }
    
    .welcome-disclaimer {
        padding: clamp(0.75rem, 2vh, 1.25rem);
    }
}

/* Extra short landscape screens */
@media (max-height: 500px) {
    .welcome-content {
        gap: clamp(0.75rem, 2vh, 1.5rem);
        padding: 0.75rem 1rem;
    }
    
    .welcome-heading {
        font-size: clamp(1.25rem, 5vw, 2.5rem);
    }
    
    .disclaimer-title {
        font-size: clamp(0.85rem, 1.6vw, 0.95rem);
    }
    
    .disclaimer-desc {
        font-size: clamp(0.75rem, 1.4vw, 0.85rem);
    }
}

/* Very wide screens with short height */
@media (min-aspect-ratio: 16/9) and (max-height: 700px) {
    .welcome-content {
        max-width: 550px;
        gap: clamp(1rem, 2.5vh, 2rem);
    }
    
    .welcome-heading {
        font-size: clamp(1.75rem, 5vw, 3.5rem);
    }
}

@media (min-width: 1024px) and (min-height: 700px) {
    .welcome-heading {
        font-size: clamp(3.5rem, 6vw, 5rem);
    }
}

.hidden {
  display: none !important;
}

/* Ask Scholar Button - Enhanced */
.ask-scholar-btn {
  background: linear-gradient(135deg, var(--accent-light), rgba(32, 128, 141, 0.2));
  color: var(--accent-primary);
  border: 2px solid var(--accent-primary);
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(32, 128, 141, 0.2);
}

.ask-scholar-btn:hover {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-hover));
  color: white !important;
  border-color: var(--accent-hover);
  box-shadow: 0 6px 20px rgba(32, 128, 141, 0.4);
}

/* Notification styles - Enhanced */
.notification {
  position: fixed;
  top: 6rem;
  right: 2rem;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  padding: 1.25rem 1.5rem;
  border-radius: 14px;
  box-shadow: var(--shadow-xl);
  z-index: 1001;
  animation: slideInRight 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  max-width: 350px;
}

@keyframes slideInRight {
  from {
    transform: translateX(400px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}