/* ==========================================================================
   CHAT PAGE STYLES - TRANG TRÒ CHUYỆN
   Fullscreen chat + Landing page
   ========================================================================== */

/* ==========================================================================
   LANDING PAGE
   ========================================================================== */

.chat-landing {
  display: block;
}

.landing-main {
  min-height: calc(100vh - var(--header-height) - var(--nav-height));
  padding: var(--spacing-xxl) 0;
  background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 50%, #f8f9fa 100%);
}

/* Hero Section */
.chat-hero {
  text-align: center;
  padding: var(--spacing-xxl) var(--spacing-lg);
  background: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  margin-bottom: var(--spacing-xxl);
  border: 3px solid var(--color-primary);
}

.hero-icon {
  font-size: 6rem;
  margin-bottom: var(--spacing-lg);
  animation: bounce 2s ease-in-out infinite;
}

.hero-title {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
}

.btn-start-chat {
  font-size: var(--font-size-xl);
  padding: var(--spacing-lg) var(--spacing-xxl);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-md);
}

.chat-warning {
  margin-top: var(--spacing-lg);
  margin-left: auto;
  margin-right: auto;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: rgba(255, 193, 7, 0.1);
  border: 1px solid rgba(255, 193, 7, 0.3);
  border-radius: var(--radius-md);
  max-width: 600px;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: #856404;
}

.chat-warning .warning-icon {
  font-size: var(--font-size-lg);
}

.chat-warning p {
  margin: 0;
  line-height: 1.6;
}

/* Features */
.chat-features {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xxl);
}

.feature-box {
  background: var(--color-white);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  border: 2px solid transparent;
}

.feature-box:hover {
  border-color: var(--color-primary);
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

.feature-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.feature-text {
  color: var(--color-text-light);
  line-height: 1.6;
}

/* How to use */
.how-to-use {
  background: var(--color-white);
  padding: var(--spacing-xxl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-primary);
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.step {
  text-align: center;
}

.step-number {
  width: 60px;
  height: 60px;
  background: var(--gradient-primary);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin: 0 auto var(--spacing-md);
  box-shadow: var(--shadow-md);
}

.step-content h4 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.step-content p {
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ==========================================================================
   FULLSCREEN CHAT
   ========================================================================== */

.chat-fullscreen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh; /* Fallback for older browsers */
  height: 100dvh;
  background: #fafafa;
  z-index: 9999;
  overflow: hidden;
}

/* Chat Container */
.chat-container {
  display: flex;
  flex-direction: column;
  height: 100vh; /* Fallback for older browsers */
  height: 100dvh;
  max-width: 100%;
  margin: 0 auto;
}

/* Chat Header */
.chat-header {
  background: var(--gradient-primary);
  color: var(--color-white);
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}

.btn-back {
  background: rgba(255, 255, 255, 0.2);
  color: var(--color-white);
  border: none;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.btn-back:hover {
  background: rgba(255, 255, 255, 0.3);
}

.btn-back .btn-text {
  display: inline;
}

.chat-header-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex: 1;
  justify-content: center;
}

.chat-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
  color: var(--color-white);
}

i.fas{
  color: var(--color-white);
}

.chat-avatar i {
  color: var(--color-white);
}

.chat-info {
  text-align: left;
}

.chat-title {
  font-size: var(--font-size-base);
  font-weight: 700;
  margin: 0;
  margin-bottom: 0.1rem;
}

.chat-status {
  font-size: var(--font-size-xs);
  margin: 0;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  opacity: 0.95;
}

.status-dot {
  width: 6px;
  height: 6px;
  background: #4ade80;
  border-radius: 50%;
  display: inline-block;
  animation: pulse 2s ease-in-out infinite;
}

.btn-clear {
  background: rgba(255, 255, 255, 0.2);
  color: var(--color-white);
  border: none;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.btn-clear:hover {
  background: rgba(255, 255, 255, 0.3);
}

.btn-clear .btn-text {
  display: inline;
}

/* Chat Messages */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-md);
  background: #fafafa;
  scroll-behavior: smooth;
  max-width: 1400px !important;
  margin: 0 auto;
  font-weight: 500;
}



.chat-messages::-webkit-scrollbar {
  width: 5px;
}

.chat-messages::-webkit-scrollbar-track {
  background: #f1f1f1;
}

.chat-messages::-webkit-scrollbar-thumb {
  background:var(--color-primary);
  border-radius: 5px;
}

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

/* Message Bubbles */
.message {
  display: flex;
  margin-bottom: var(--spacing-md);
  animation: fadeInUp 0.4s ease-out;
  gap: var(--spacing-sm);
  max-width: 85%;
}

.message.user {
  flex-direction: row-reverse;
  margin-left: auto;
}

.message.ai {
  margin-right: auto;
}

.message-avatar {
  width: 35px;
  height: 35px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}

.message.user .message-avatar {
  background: var(--color-white);
  border: 2px solid var(--color-primary);
  color: var(--color-white);
}

.message.ai .message-avatar {
  background: var(--color-white);
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
}

.message-content {
  flex: 1;
  max-width: 100%;
}

.message-bubble {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  line-height: 1.5;
  word-wrap: break-word;
  box-shadow: var(--shadow-sm);
  position: relative;
  font-size: var(--font-size-sm);
}

.message.user .message-bubble {
  background: var(--gradient-primary);
  color: var(--color-white);
  border-bottom-right-radius: var(--radius-sm);
}

.message.ai .message-bubble {
  background: var(--color-white);
  color: var(--color-text);
  border: 2px solid var(--color-gray);
  border-bottom-left-radius: var(--radius-sm);
}

.message-time {
  font-size: var(--font-size-sm);
  color: var(--color-gray-dark);
  margin-top: var(--spacing-xs);
  text-align: right;
}

.message.user .message-time {
  color: var(--color-gray-dark);
}

/* Welcome Message */
.message.welcome .message-bubble {
  background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
  border: 2px solid var(--color-primary);
  font-size: var(--font-size-lg);
  padding: var(--spacing-xl);
}

.message.welcome .quick-suggestions {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 2px dashed var(--color-primary);
}

.message.welcome .suggestions-title {
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-lg);
}

.message.welcome .suggestion-btn {
  display: block;
  width: 100%;
  background: var(--color-white);
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-sm);
  text-align: left;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: var(--font-size-base);
  font-weight: 600;
}

.message.welcome .suggestion-btn:hover {
  background: var(--color-primary);
  color: var(--color-white);
  transform: translateX(5px);
}

/* Typing Indicator */
.typing-indicator {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-white);
  border: 2px solid var(--color-gray);
  border-radius: var(--radius-lg);
  width: fit-content;
  margin: 0 0 var(--spacing-lg) calc(50px + var(--spacing-md));
  animation: fadeIn 0.3s ease-out;
}

.typing-dot {
  width: 10px;
  height: 10px;
  background: var(--color-primary);
  border-radius: 50%;
  animation: typing 1.4s infinite;
}

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

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

@keyframes typing {
  0%, 60%, 100% {
    transform: translateY(0);
  }
  30% {
    transform: translateY(-10px);
  }
}

.typing-text {
  font-size: var(--font-size-base);
  color: var(--color-gray-dark);
  font-style: italic;
}

/* Chat Disclaimer */
.chat-disclaimer {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--font-size-xs);
  color: var(--color-text-light);
  text-align: center;
  background-color: var(--color-background);
}

.chat-disclaimer p {
  margin: 0;
}

/* Chat Input */
.chat-input-container {
  background: var(--color-white);
  padding: var(--spacing-sm);
  border-top: 2px solid var(--color-gray);
  flex-shrink: 0;
  box-shadow: 0 -2px 4px rgba(0, 0, 0, 0.05);
}

.chat-input-wrapper {
  display: flex;
  gap: var(--spacing-sm);
  align-items: flex-end;
  max-width: 1200px;
  margin: 0 auto;
}

.chat-input {
  flex: 1;
  min-height: 40px;
  max-height: 120px;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid var(--color-gray);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  resize: none;
  transition: all var(--transition-fast);
  font-family: inherit;
  line-height: 1.4;
}

.chat-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(0, 85, 204, 0.1);
}

.btn-send {
  background: var(--gradient-primary);
  color: var(--color-white);
  border: none;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  box-shadow: var(--shadow-sm);
  min-height: 40px;
  flex-shrink: 0;
}

.btn-send:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-send:active:not(:disabled) {
  transform: translateY(0);
}

.btn-send:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.send-icon {
  font-size: var(--font-size-lg);
  font-weight: bold;
}

.send-text {
  font-size: var(--font-size-sm);
}

/* ==========================================================================
   ANIMATIONS
   ========================================================================== */

/* Scroll animations for landing page */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease-out;
}

.animate-on-scroll.animated {
  opacity: 1;
  transform: translateY(0);
}

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

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

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-20px);
  }
}

/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */

@media (max-width: 1024px) {
  .chat-features {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .landing-main {
    padding: var(--spacing-md) 0;
  }

  .hero-icon {
    font-size: 3rem;
  }

  .hero-title {
    font-size: var(--font-size-xl);
  }

  .hero-subtitle {
    font-size: var(--font-size-sm);
  }

  .chat-features {
    grid-template-columns: 1fr;
  }

  .chat-header {
    padding: var(--spacing-xs) var(--spacing-sm);
  }
  
  .chat-title {
    font-size: var(--font-size-sm);
  }
  
  .chat-status {
    font-size: 0.65rem;
  }
  
  .chat-avatar {
    width: 30px;
    height: 30px;
    font-size: 1.2rem;
  }
  
  .chat-messages {
    padding: var(--spacing-sm);

  }
  
  .message {
    max-width: 90%;
    margin-bottom: var(--spacing-sm);
  }
  
  .message-avatar {
    width: 30px;
    height: 30px;
    font-size: 1.1rem;
  }
  
  .message-bubble {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
  }
  
  /* Hide text labels on mobile, show only icons */
  .btn-back .btn-text,
  .btn-clear .btn-text,
  .send-text {
    display: none;
  }
  
  .btn-back,
  .btn-clear {
    font-size: var(--font-size-lg);
    padding: var(--spacing-xs);
    min-width: 32px;
    justify-content: center;
  }
  
  .chat-input {
    font-size: var(--font-size-xs);
    min-height: 36px;
    padding: var(--spacing-xs) var(--spacing-sm);
  }
  
  .btn-send {
    padding: var(--spacing-xs) var(--spacing-sm);
    min-height: 36px;
    min-width: 36px;
  }
  
  .send-icon {
    font-size: var(--font-size-lg);
  }
  
  .chat-input-container {
    padding: var(--spacing-xs);
  }
}

@media (max-width: 640px) {
  .chat-input-wrapper {
    gap: var(--spacing-sm);
  }
  
  .message.welcome .message-bubble {
    padding: var(--spacing-md);
    font-size: var(--font-size-base);
  }
  
  .message.welcome .suggestion-btn {
    padding: var(--spacing-sm);
    font-size: var(--font-size-sm);
  }
  
  .btn-send {
    padding: var(--spacing-sm) var(--spacing-md);
  }
}