/*
 * Layout Styles - Main structure and responsive design
 */

/* === Main Chat Application Container === */
.chat-app {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100vh;
  background: var(--gradient-background);
  position: relative;
  overflow: hidden;
}

/* === Chat Header === */
.chat-header {
  height: var(--header-height);
  background: var(--header-bg);
  backdrop-filter: blur(var(--header-backdrop-blur));
  -webkit-backdrop-filter: blur(var(--header-backdrop-blur));
  border-bottom: 1px solid rgba(8, 190, 213, 0.2);
  box-shadow: var(--shadow-sm);
  z-index: var(--z-sticky);
  flex-shrink: 0;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: 0 var(--spacing-lg);
  gap: var(--spacing-md);
}

.logo-container {
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-text {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  background: var(--gradient-user-bubble);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

.header-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  letter-spacing: 0.5px;
}

/* === Chat Messages Container === */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  background: rgba(0, 31, 34, 0.4);
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
}

/* === Chat Input Area === */
.chat-input {
  height: var(--input-height);
  background: var(--color-bg-surface);
  border-top: 1px solid rgba(8, 190, 213, 0.2);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-sm) var(--spacing-lg);
  flex-shrink: 0;
  z-index: var(--z-sticky);
}

.input-container {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
  height: 100%;
}

.message-input {
  flex: 1;
  height: 44px;
  padding: 0 var(--spacing-md);
  background: var(--input-bg);
  border: var(--input-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: var(--font-size-md);
  transition: all var(--transition-normal);
  outline: none;
}

.message-input::placeholder {
  color: var(--color-text-secondary);
  opacity: 0.6;
}

.message-input:focus {
  border: var(--input-border-focus);
  box-shadow: 0 0 0 3px rgba(8, 190, 213, 0.1);
  background: rgba(0, 77, 82, 0.8);
}

.send-button {
  width: 48px;
  height: 48px;
  min-width: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-button);
  border-radius: var(--radius-md);
  color: var(--color-white);
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.send-button:hover:not(:disabled) {
  background: var(--gradient-button-hover);
  transform: scale(1.05);
  box-shadow: var(--shadow-glow-cyan);
}

.send-button:active:not(:disabled) {
  transform: scale(0.98);
}

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

.send-button svg {
  width: 24px;
  height: 24px;
}

/* === Responsive Design === */

/* Mobile (default) - 0px to 767px */
@media (max-width: 767px) {
  .chat-messages {
    padding: var(--spacing-md);
  }

  .chat-input {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .header-title {
    font-size: var(--font-size-md);
  }

  .logo-text {
    font-size: var(--font-size-lg);
  }

  .message-input {
    font-size: var(--font-size-sm);
  }
}

/* Tablet - 768px to 1023px */
@media (min-width: 768px) {
  .chat-app {
    width: 90%;
    max-width: 90vw;
    height: 95vh;
    margin: 2.5vh auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
  }

  .chat-messages {
    padding: var(--spacing-xl);
  }

  .header-content {
    padding: 0 var(--spacing-xl);
  }
}

/* Desktop - 1024px and above */
@media (min-width: 1024px) {
  .chat-app {
    max-width: 900px;
    width: 900px;
    height: 90vh;
    margin: 5vh auto;
  }

  .chat-messages {
    padding: var(--spacing-2xl);
  }

  .message-input {
    font-size: var(--font-size-md);
  }
}

/* Large Desktop - 1440px and above */
@media (min-width: 1440px) {
  .chat-app {
    max-width: 1000px;
    width: 1000px;
  }
}

/* === Landscape Mode Adjustments === */
@media (max-width: 767px) and (orientation: landscape) {
  .chat-app {
    height: 100vh;
  }

  .chat-header {
    height: 50px;
  }

  .chat-messages {
    padding: var(--spacing-sm);
  }

  .chat-input {
    height: 50px;
  }
}

/* === High DPI Displays === */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .chat-header {
    border-bottom-width: 0.5px;
  }

  .chat-input {
    border-top-width: 0.5px;
  }
}