/**
 * DeepSeek AI Chat - Professional Design System
 * Version: 3.0.0
 * Description: Modern, accessible, and SEO-optimized chat interface
 * Author: DeepSeek AI
 * License: GPL v2 or later
 */

/* ============================================
   1. CSS CUSTOM PROPERTIES & DESIGN TOKENS
   ============================================ */
:root {
  /* Brand Colors - Modern Purple Gradient */
  --ds-brand-primary: #6B46C1;
  --ds-brand-primary-rgb: 107, 70, 193;
  --ds-brand-secondary: #9333EA;
  --ds-brand-secondary-rgb: 147, 51, 234;
  --ds-brand-tertiary: #A855F7;
  --ds-brand-accent: #10B981;
  --ds-brand-gradient: linear-gradient(135deg, #6B46C1 0%, #9333EA 50%, #A855F7 100%);
  --ds-brand-gradient-hover: linear-gradient(135deg, #5B3AA8 0%, #7E2CC7 50%, #9144DD 100%);
  
  /* Neutral Palette - Professional Grays */
  --ds-gray-50: #FAFAFA;
  --ds-gray-100: #F4F4F5;
  --ds-gray-200: #E4E4E7;
  --ds-gray-300: #D4D4D8;
  --ds-gray-400: #A1A1AA;
  --ds-gray-500: #71717A;
  --ds-gray-600: #52525B;
  --ds-gray-700: #3F3F46;
  --ds-gray-800: #27272A;
  --ds-gray-900: #18181B;
  --ds-gray-950: #09090B;
  
  /* Background Colors */
  --ds-bg-primary: #FFFFFF;
  --ds-bg-secondary: #FAFAFA;
  --ds-bg-tertiary: #F4F4F5;
  --ds-bg-elevated: #FFFFFF;
  --ds-bg-overlay: rgba(0, 0, 0, 0.5);
  
  /* Text Colors */
  --ds-text-primary: #18181B;
  --ds-text-secondary: #52525B;
  --ds-text-tertiary: #71717A;
  --ds-text-muted: #A1A1AA;
  --ds-text-inverse: #FFFFFF;
  --ds-text-link: #6B46C1;
  
  /* Border Colors */
  --ds-border-subtle: #F4F4F5;
  --ds-border-default: #E4E4E7;
  --ds-border-strong: #D4D4D8;
  
  /* Shadows - Subtle and Professional */
  --ds-shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --ds-shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.08);
  --ds-shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05), 0 2px 4px rgba(0, 0, 0, 0.08);
  --ds-shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.05), 0 4px 6px rgba(0, 0, 0, 0.08);
  --ds-shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.05), 0 8px 10px rgba(0, 0, 0, 0.08);
  --ds-shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.08);
  --ds-shadow-glow: 0 0 20px rgba(107, 70, 193, 0.15);
  
  /* Typography Scale */
  --ds-font-family-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --ds-font-family-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", monospace;
  
  --ds-text-xs: 0.75rem;     /* 12px */
  --ds-text-sm: 0.875rem;    /* 14px */
  --ds-text-base: 1rem;      /* 16px */
  --ds-text-lg: 1.125rem;    /* 18px */
  --ds-text-xl: 1.25rem;     /* 20px */
  --ds-text-2xl: 1.5rem;     /* 24px */
  
  --ds-font-normal: 400;
  --ds-font-medium: 500;
  --ds-font-semibold: 600;
  --ds-font-bold: 700;
  
  /* Spacing Scale */
  --ds-space-0: 0;
  --ds-space-1: 0.25rem;  /* 4px */
  --ds-space-2: 0.5rem;   /* 8px */
  --ds-space-3: 0.75rem;  /* 12px */
  --ds-space-4: 1rem;     /* 16px */
  --ds-space-5: 1.25rem;  /* 20px */
  --ds-space-6: 1.5rem;   /* 24px */
  --ds-space-8: 2rem;     /* 32px */
  --ds-space-10: 2.5rem;  /* 40px */
  --ds-space-12: 3rem;    /* 48px */
  
  /* Border Radius */
  --ds-radius-sm: 0.375rem;   /* 6px */
  --ds-radius-md: 0.5rem;     /* 8px */
  --ds-radius-lg: 0.75rem;    /* 12px */
  --ds-radius-xl: 1rem;       /* 16px */
  --ds-radius-2xl: 1.25rem;   /* 20px */
  --ds-radius-full: 9999px;
  
  /* Animation */
  --ds-duration-fast: 150ms;
  --ds-duration-base: 250ms;
  --ds-duration-slow: 350ms;
  --ds-duration-slower: 500ms;
  --ds-ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ds-ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ds-ease-in: cubic-bezier(0.4, 0, 1, 1);
  
  /* Z-Index Scale */
  --ds-z-base: 0;
  --ds-z-dropdown: 1000;
  --ds-z-sticky: 1100;
  --ds-z-overlay: 1200;
  --ds-z-modal: 1300;
  --ds-z-popover: 1400;
  --ds-z-tooltip: 1500;
}

/* Dark Theme Variables */
[data-theme="dark"] {
  --ds-bg-primary: #09090B;
  --ds-bg-secondary: #18181B;
  --ds-bg-tertiary: #27272A;
  --ds-bg-elevated: #18181B;
  
  --ds-text-primary: #FAFAFA;
  --ds-text-secondary: #A1A1AA;
  --ds-text-tertiary: #71717A;
  --ds-text-muted: #52525B;
  
  --ds-border-subtle: #27272A;
  --ds-border-default: #3F3F46;
  --ds-border-strong: #52525B;
  
  --ds-shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2), 0 1px 2px rgba(0, 0, 0, 0.3);
  --ds-shadow-md: 0 4px 6px rgba(0, 0, 0, 0.2), 0 2px 4px rgba(0, 0, 0, 0.3);
  --ds-shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3), 0 4px 6px rgba(0, 0, 0, 0.4);
}

/* ============================================
   2. RESET & BASE STYLES
   ============================================ */
.deepseek-ai-widget *,
.deepseek-ai-widget *::before,
.deepseek-ai-widget *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.deepseek-ai-widget {
  font-family: var(--ds-font-family-sans);
  font-size: var(--ds-text-base);
  line-height: 1.5;
  color: var(--ds-text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   3. MAIN CONTAINER - SEMANTIC STRUCTURE
   ============================================ */
.deepseek-ai-widget {
  position: relative;
  width: 80%;
  max-width: 600px;
  margin: var(--ds-space-6) auto;
}

.deepseek-ai-assistant {
  display: flex;
  flex-direction: column;
  background: var(--ds-bg-elevated);
  border-radius: var(--ds-radius-2xl);
  box-shadow: var(--ds-shadow-2xl);
  overflow: hidden;
  height: 650px;
  border: 1px solid var(--ds-border-subtle);
  position: relative;
}

/* ============================================
   4. HEADER - BRAND & CONTROLS
   ============================================ */
.deepseek-ai-header {
  background: var(--ds-brand-gradient);
  padding: var(--ds-space-4) var(--ds-space-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  z-index: var(--ds-z-sticky);
  box-shadow: var(--ds-shadow-md);
}

.deepseek-ai-header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, 
    transparent 0%, 
    rgba(255, 255, 255, 0.2) 50%, 
    transparent 100%);
}

.deepseek-ai-brand {
  display: flex;
  align-items: center;
  gap: var(--ds-space-3);
}

.deepseek-ai-logo {
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: var(--ds-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(10px);
}

.deepseek-ai-logo svg {
  width: 24px;
  height: 24px;
  color: var(--ds-text-inverse);
}

.deepseek-ai-title {
  color: var(--ds-text-inverse);
}

.deepseek-ai-title h1 {
  font-size: var(--ds-text-lg);
  font-weight: var(--ds-font-semibold);
  letter-spacing: -0.02em;
}

.deepseek-ai-subtitle {
  font-size: var(--ds-text-sm);
  opacity: 0.9;
  margin-top: var(--ds-space-1);
}

.deepseek-ai-status {
  display: flex;
  align-items: center;
  gap: var(--ds-space-2);
  padding: var(--ds-space-1) var(--ds-space-3);
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--ds-radius-full);
  font-size: var(--ds-text-sm);
  color: var(--ds-text-inverse);
}

.deepseek-ai-status-indicator {
  width: 8px;
  height: 8px;
  background: #10B981;
  border-radius: var(--ds-radius-full);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.9); }
}

/* ============================================
   5. CONTROLS BAR
   ============================================ */
.deepseek-ai-controls {
  display: flex;
  align-items: center;
  gap: var(--ds-space-3);
}

.deepseek-ai-model-selector {
  display: flex;
  gap: var(--ds-space-2);
}

.deepseek-ai-model-chip {
  padding: var(--ds-space-2) var(--ds-space-3);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--ds-radius-full);
  color: var(--ds-text-inverse);
  font-size: var(--ds-text-sm);
  font-weight: var(--ds-font-medium);
  cursor: pointer;
  transition: all var(--ds-duration-fast) var(--ds-ease-in-out);
  display: flex;
  align-items: center;
  gap: var(--ds-space-2);
  backdrop-filter: blur(10px);
}

.deepseek-ai-model-chip:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
}

.deepseek-ai-model-chip.active {
  background: var(--ds-bg-primary);
  color: var(--ds-brand-primary);
  border-color: var(--ds-bg-primary);
  box-shadow: var(--ds-shadow-md);
}

.deepseek-ai-model-chip .model-icon {
  font-size: var(--ds-text-base);
}

.deepseek-ai-actions {
  display: flex;
  gap: var(--ds-space-2);
}

.deepseek-ai-btn-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--ds-radius-full);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--ds-text-inverse);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--ds-duration-fast) var(--ds-ease-in-out);
  backdrop-filter: blur(10px);
}

.deepseek-ai-btn-icon:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.05);
}

.deepseek-ai-btn-icon.active {
  background: var(--ds-bg-primary);
  color: var(--ds-brand-primary);
}

/* ============================================
   6. CONVERSATION AREA
   ============================================ */
.deepseek-ai-conversation {
  flex: 1;
  overflow-y: auto;
  padding: var(--ds-space-6);
  background: var(--ds-bg-secondary);
  scroll-behavior: smooth;
  position: relative;
}

/* Custom Scrollbar */
.deepseek-ai-conversation::-webkit-scrollbar {
  width: 6px;
}

.deepseek-ai-conversation::-webkit-scrollbar-track {
  background: transparent;
}

.deepseek-ai-conversation::-webkit-scrollbar-thumb {
  background: var(--ds-gray-300);
  border-radius: var(--ds-radius-full);
}

.deepseek-ai-conversation::-webkit-scrollbar-thumb:hover {
  background: var(--ds-gray-400);
}

/* Message Container */
.deepseek-ai-message {
  margin-bottom: var(--ds-space-5);
  animation: messageSlideIn var(--ds-duration-base) var(--ds-ease-out);
}

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

.deepseek-ai-message-content {
  display: flex;
  gap: var(--ds-space-3);
  align-items: flex-start;
}

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

/* Avatar */
.deepseek-ai-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--ds-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-weight: var(--ds-font-semibold);
  font-size: var(--ds-text-sm);
}

.deepseek-ai-message.assistant .deepseek-ai-avatar {
  background: var(--ds-brand-gradient);
  color: var(--ds-text-inverse);
  box-shadow: var(--ds-shadow-glow);
}

.deepseek-ai-message.user .deepseek-ai-avatar {
  background: var(--ds-gray-200);
  color: var(--ds-text-secondary);
}

/* Message Bubble */
.deepseek-ai-bubble {
  max-width: 70%;
  position: relative;
}

.deepseek-ai-bubble-inner {
  padding: var(--ds-space-3) var(--ds-space-4);
  border-radius: var(--ds-radius-xl);
  position: relative;
  word-wrap: break-word;
}

.deepseek-ai-message.assistant .deepseek-ai-bubble-inner {
  background: var(--ds-bg-primary);
  border: 1px solid var(--ds-border-default);
  box-shadow: var(--ds-shadow-sm);
  color: var(--ds-text-primary);
  border-bottom-left-radius: var(--ds-space-1);
}

.deepseek-ai-message.user .deepseek-ai-bubble-inner {
  background: var(--ds-brand-gradient);
  color: var(--ds-text-inverse);
  box-shadow: var(--ds-shadow-md);
  border-bottom-right-radius: var(--ds-space-1);
}

/* Message Text Formatting */
.deepseek-ai-text {
  font-size: var(--ds-text-base);
  line-height: 1.6;
}

.deepseek-ai-text p {
  margin-bottom: var(--ds-space-3);
}

.deepseek-ai-text p:last-child {
  margin-bottom: 0;
}

.deepseek-ai-text code {
  padding: var(--ds-space-1) var(--ds-space-2);
  background: var(--ds-bg-tertiary);
  border-radius: var(--ds-radius-sm);
  font-family: var(--ds-font-family-mono);
  font-size: 0.9em;
  color: var(--ds-brand-primary);
}

.deepseek-ai-text pre {
  margin: var(--ds-space-3) 0;
  padding: var(--ds-space-4);
  background: var(--ds-gray-900);
  border-radius: var(--ds-radius-lg);
  overflow-x: auto;
}

.deepseek-ai-text pre code {
  background: transparent;
  color: var(--ds-gray-100);
  padding: 0;
}

/* Message Metadata */
.deepseek-ai-message-meta {
  display: flex;
  align-items: center;
  gap: var(--ds-space-2);
  margin-top: var(--ds-space-2);
  padding: 0 var(--ds-space-1);
}

.deepseek-ai-message.user .deepseek-ai-message-meta {
  justify-content: flex-end;
}

.deepseek-ai-timestamp {
  font-size: var(--ds-text-xs);
  color: var(--ds-text-tertiary);
}

/* Typing Indicator */
.deepseek-ai-typing {
  display: none;
  align-items: center;
  gap: var(--ds-space-3);
  padding: var(--ds-space-3);
}

.deepseek-ai-typing.active {
  display: flex;
}

.deepseek-ai-typing-dots {
  display: flex;
  gap: var(--ds-space-1);
  padding: var(--ds-space-3) var(--ds-space-4);
  background: var(--ds-bg-primary);
  border-radius: var(--ds-radius-xl);
  border: 1px solid var(--ds-border-default);
}

.deepseek-ai-typing-dot {
  width: 8px;
  height: 8px;
  background: var(--ds-gray-400);
  border-radius: var(--ds-radius-full);
  animation: typingBounce 1.4s ease-in-out infinite;
}

.deepseek-ai-typing-dot:nth-child(2) {
  animation-delay: 0.2s;
}

.deepseek-ai-typing-dot:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes typingBounce {
  0%, 60%, 100% {
    transform: translateY(0);
    opacity: 0.5;
  }
  30% {
    transform: translateY(-10px);
    opacity: 1;
  }
}

/* ============================================
   7. INPUT AREA
   ============================================ */
.deepseek-ai-input-area {
  padding: var(--ds-space-5);
  background: var(--ds-bg-primary);
  border-top: 1px solid var(--ds-border-subtle);
  position: relative;
}

.deepseek-ai-input-form {
  display: flex;
  gap: var(--ds-space-3);
  align-items: flex-end;
}

.deepseek-ai-input-wrapper {
  flex: 1;
  position: relative;
}

.deepseek-ai-input-field {
  width: 100%;
  min-height: 52px;
  max-height: 120px;
  padding: var(--ds-space-3) var(--ds-space-4);
  padding-right: var(--ds-space-12);
  background: var(--ds-bg-secondary);
  border: 2px solid var(--ds-border-default);
  border-radius: var(--ds-radius-xl);
  font-family: var(--ds-font-family-sans);
  font-size: var(--ds-text-base);
  color: var(--ds-text-primary);
  resize: none;
  transition: all var(--ds-duration-fast) var(--ds-ease-in-out);
  outline: none;
}

.deepseek-ai-input-field:focus {
  border-color: var(--ds-brand-primary);
  background: var(--ds-bg-primary);
  box-shadow: 0 0 0 3px rgba(var(--ds-brand-primary-rgb), 0.1);
}

.deepseek-ai-input-field::placeholder {
  color: var(--ds-text-muted);
}

/* Character Counter */
.deepseek-ai-char-counter {
  position: absolute;
  right: var(--ds-space-3);
  bottom: var(--ds-space-3);
  font-size: var(--ds-text-xs);
  color: var(--ds-text-tertiary);
}

/* Settings Modal Styles */
.deepseek-settings-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.2s ease;
}

.settings-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.settings-panel {
  position: relative;
  background: white;
  border-radius: 16px;
  max-width: 500px;
  width: 90%;
  max-height: 80vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  animation: slideUp 0.3s ease;
}

.settings-header {
  padding: 24px;
  border-bottom: 1px solid #e5e7eb;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.settings-header h3 {
  margin: 0;
  font-size: 20px;
  font-weight: 600;
  color: #111827;
}

.settings-close {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: none;
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  color: #6b7280;
}

.settings-close:hover {
  background: #f3f4f6;
  color: #111827;
}

.settings-content {
  padding: 24px;
  overflow-y: auto;
  flex: 1;
}

.setting-group {
  margin-bottom: 24px;
}

.setting-group:last-child {
  margin-bottom: 0;
}

.setting-label {
  display: flex;
  flex-direction: column;
  margin-bottom: 12px;
}

.setting-label span {
  font-size: 14px;
  font-weight: 600;
  color: #111827;
  margin-bottom: 4px;
}

.setting-label small {
  font-size: 12px;
  color: #6b7280;
}

.model-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.model-option {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  background: #f9fafb;
  border: 2px solid #e5e7eb;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s;
}

.model-option:hover {
  background: #f3f4f6;
  border-color: #d1d5db;
}

.model-option.active {
  background: #eef2ff;
  border-color: #6366f1;
}

.model-icon {
  font-size: 24px;
}

.model-option div strong {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: #111827;
  margin-bottom: 2px;
}

.model-option div small {
  font-size: 12px;
  color: #6b7280;
}

/* Toggle Switch */
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 24px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #cbd5e1;
  transition: 0.3s;
  border-radius: 24px;
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: 0.3s;
  border-radius: 50%;
}

.toggle-switch input:checked + .toggle-slider {
  background-color: #6366f1;
}

.toggle-switch input:checked + .toggle-slider:before {
  transform: translateX(24px);
}

.theme-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.theme-option {
  padding: 12px 20px;
  background: #f9fafb;
  border: 2px solid #e5e7eb;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 14px;
  font-weight: 500;
  text-align: center;
}

.theme-option:hover {
  background: #f3f4f6;
  border-color: #d1d5db;
}

.theme-option.active {
  background: #eef2ff;
  border-color: #6366f1;
  color: #6366f1;
}

.settings-footer {
  padding: 16px 24px;
  border-top: 1px solid #e5e7eb;
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

.settings-save,
.settings-cancel {
  padding: 8px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}

.settings-save {
  background: #6366f1;
  color: white;
}

.settings-save:hover {
  background: #4f46e5;
}

.settings-cancel {
  background: #f3f4f6;
  color: #6b7280;
}

.settings-cancel:hover {
  background: #e5e7eb;
  color: #4b5563;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

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

/* Input Actions */
.deepseek-ai-input-actions {
  position: absolute;
  right: var(--ds-space-3);
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  gap: var(--ds-space-2);
}

.deepseek-ai-btn-attach {
  width: 32px;
  height: 32px;
  border-radius: var(--ds-radius-md);
  background: transparent;
  border: none;
  color: var(--ds-text-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--ds-duration-fast) var(--ds-ease-in-out);
}

.deepseek-ai-btn-attach:hover {
  background: var(--ds-bg-tertiary);
  color: var(--ds-text-primary);
}

/* Send Button */
.deepseek-ai-btn-send {
  width: 52px;
  height: 52px;
  border-radius: var(--ds-radius-xl);
  background: var(--ds-brand-gradient);
  border: none;
  color: var(--ds-text-inverse);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--ds-duration-fast) var(--ds-ease-in-out);
  box-shadow: var(--ds-shadow-md);
  position: relative;
  overflow: hidden;
}

.deepseek-ai-btn-send:hover {
  background: var(--ds-brand-gradient-hover);
  transform: scale(1.05);
  box-shadow: var(--ds-shadow-lg);
}

.deepseek-ai-btn-send:active {
  transform: scale(0.98);
}

.deepseek-ai-btn-send:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.deepseek-ai-btn-send svg {
  width: 20px;
  height: 20px;
  transition: transform var(--ds-duration-fast) var(--ds-ease-in-out);
}

.deepseek-ai-btn-send:hover svg {
  transform: translateX(2px);
}

/* ============================================
   8. RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 768px) {
  .deepseek-ai-widget {
    margin: 0;
    max-width: 80%;
  }
  
  .deepseek-ai-assistant {
    height: 100vh;
    border-radius: 0;
  }
  
  .deepseek-ai-header {
    padding: var(--ds-space-3) var(--ds-space-4);
  }
  
  .deepseek-ai-conversation {
    padding: var(--ds-space-4);
  }
  
  .deepseek-ai-bubble {
    max-width: 85%;
  }
  
  .deepseek-ai-model-selector {
    flex-direction: column;
    width: 100%;
  }
  
  .deepseek-ai-model-chip {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .deepseek-ai-title h1 {
    font-size: var(--ds-text-base);
  }
  
  .deepseek-ai-subtitle {
    display: none;
  }
  
  .deepseek-ai-status span {
    display: none;
  }
}

/* ============================================
   9. ACCESSIBILITY & FOCUS STATES
   ============================================ */
.deepseek-ai-widget *:focus-visible {
  outline: 2px solid var(--ds-brand-primary);
  outline-offset: 2px;
}

.deepseek-ai-widget button:focus-visible,
.deepseek-ai-widget [role="button"]:focus-visible {
  outline: 2px solid var(--ds-brand-primary);
  outline-offset: 2px;
}

/* Skip to content link */
.deepseek-ai-skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--ds-brand-primary);
  color: var(--ds-text-inverse);
  padding: var(--ds-space-2) var(--ds-space-4);
  text-decoration: none;
  border-radius: var(--ds-radius-md);
  z-index: var(--ds-z-tooltip);
}

.deepseek-ai-skip-link:focus {
  top: var(--ds-space-2);
}

/* ============================================
   10. LOADING & SKELETON STATES
   ============================================ */
.deepseek-ai-skeleton {
  background: linear-gradient(
    90deg,
    var(--ds-gray-200) 25%,
    var(--ds-gray-100) 50%,
    var(--ds-gray-200) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--ds-radius-md);
}

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

/* ============================================
   11. PRINT STYLES
   ============================================ */
@media print {
  .deepseek-ai-header,
  .deepseek-ai-input-area {
    display: none;
  }
  
  .deepseek-ai-conversation {
    height: auto;
    overflow: visible;
  }
  
  .deepseek-ai-message {
    page-break-inside: avoid;
  }
}