/* Base Styles & Variables */
:root {
  --primary-color: #3b82f6; /* Modern Vibrant Blue */
  --primary-hover: #2563eb;
  --bg-gradient: linear-gradient(135deg, #f0f4f8 0%, #e2e8f0 100%);
  --card-bg: #ffffff;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --border-color: #cbd5e1;
  --border-focus: #3b82f6;
  --border-radius: 12px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
  --info-bg: #eff6ff;
  --info-border: #bfdbfe;
  --info-text: #1e40af;
  --error-bg: #fef2f2;
  --error-border: #fecaca;
  --error-text: #991b1b;
  --success-bg: #f0fdf4;
  --success-border: #bbf7d0;
  --success-text: #166534;
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg-gradient);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;         /* Align children vertically */
  justify-content: flex-start;     /* Top-align content to prevent shifts */
  align-items: center;             /* Center horizontally */
  padding: 40px 20px;              /* Comfortable top/bottom padding */
  line-height: 1.5;
}

/* App Container */
.app-container {
  width: 100%;
  max-width: 1000px;
  background: var(--card-bg);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  transition: transform 0.2s ease;
}

/* Header Styles */
.app-header {
  text-align: center;
  border-bottom: 1px solid #f1f5f9;
  padding-bottom: 20px;
}

.app-title {
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(to right, #2563eb, #3b82f6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 6px;
}

.app-subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Global Preference Settings */
.global-preferences-container {
  display: flex;
  justify-content: center;
  margin-top: 14px;
}

.global-preferences-container .select-wrapper {
  flex-direction: row;        /* Align label and select horizontally */
  align-items: center;        /* Vertically center align elements */
  gap: 12px;                  /* Compact spacing between label and dropdown */
  max-width: 320px;           /* Allow slightly wider width for horizontal layout */
  width: 100%;
}

.global-preferences-container .select-wrapper label {
  margin-bottom: 0;           /* Remove bottom margin to align nicely on same line */
  flex-shrink: 0;             /* Prevent label from shrinking */
  white-space: nowrap;        /* Prevent label text from wrapping */
}

/* Message UI Bar */
.message-bar {
  padding: 14px 18px;
  border-radius: var(--border-radius);
  font-size: 0.9rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 12px;
  border: 1px solid transparent;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-sm);
  animation: slideDown 0.3s ease-out;
  margin-top: 12px; /* Spacing from the main block above */
}

.message-bar.info {
  background-color: var(--info-bg);
  border-color: var(--info-border);
  color: var(--info-text);
}

.message-bar.error {
  background-color: var(--error-bg);
  border-color: var(--error-border);
  color: var(--error-text);
}

.message-bar.success {
  background-color: var(--success-bg);
  border-color: var(--success-border);
  color: var(--success-text);
}

.message-bar.hidden {
  display: none !important;
  opacity: 0;
  transform: translateY(-10px);
  margin-top: 0;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Selection and Controls */
.selector-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin: 8px 0;
}

.select-wrapper {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
  max-width: 240px;
}

.select-wrapper label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.custom-select {
  width: 100%;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background-color: #fafafa;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-main);
  cursor: pointer;
  outline: none;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-sm);
}

.custom-select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
  background-color: #fff;
}

.arrow-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  margin-top: 18px; /* Offset label space */
  cursor: pointer;
  width: 42px;        /* Fix button size to prevent stretching */
  height: 42px;       /* Fix button size to prevent stretching */
  flex-shrink: 0;     /* Prevent shrink in flex containers */
  padding: 8px;
  border-radius: 50%;
  background-color: #f8fafc;
  border: 1px solid var(--border-color);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-sm);
}

.arrow-indicator:hover {
  color: var(--primary-color);
  background-color: #eff6ff;
  border-color: var(--primary-color);
  transform: scale(1.1) rotate(180deg);
}

.arrow-indicator:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.arrow-indicator:active {
  transform: scale(0.95) rotate(180deg);
}

/* Main Textarea Panels */
.textareas-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.textarea-box {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.textarea-wrapper {
  position: relative;
  flex-grow: 1;
  display: flex;
}

.textarea-box textarea {
  width: 100%;
  min-height: 320px; /* Expanded from 220px to provide a larger workspace on PC screens */
  padding: 18px;
  font-family: inherit;
  font-size: 1.05rem;
  line-height: 1.6;
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  resize: vertical;
  outline: none;
  background-color: #ffffff;
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.source-box textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 10px 15px -3px rgba(59, 130, 246, 0.08), 0 0 0 4px rgba(59, 130, 246, 0.15);
}

.target-box textarea {
  background-color: #f8fafc;
  cursor: default;
}

.char-count, .status-badge {
  font-size: 0.8rem;
  color: var(--text-muted);
  align-self: flex-end;
  font-weight: 500;
}

.status-badge {
  background-color: #f1f5f9;
  padding: 3px 8px;
  border-radius: 4px;
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.02em;
}

.status-badge.translating {
  background-color: #fef3c7;
  color: #d97706;
}

.status-badge.ready {
  background-color: #dcfce7;
  color: #15803d;
}

/* Loading Spinner and Overlay */
.spinner-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(2px);
  border-radius: var(--border-radius);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 10;
  transition: opacity 0.2s ease;
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid rgba(59, 130, 246, 0.15);
  border-radius: 50%;
  border-top-color: var(--primary-color);
  animation: spin 0.8s linear infinite;
}

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

.hidden {
  display: none !important;
  opacity: 0;
  pointer-events: none;
}

/* Footer Styles */
.app-footer {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid #f1f5f9;
  padding-top: 16px;
}

/* Responsive Layout */
@media (max-width: 768px) {
  .app-container {
    padding: 20px;
  }

  .selector-container {
    flex-direction: column;
    gap: 12px;
    align-items: stretch;
  }

  .select-wrapper {
    max-width: 100%;
  }

  .arrow-indicator {
    align-self: center; /* Prevent button from stretching horizontally */
    margin-top: 0;
    margin-bottom: 6px;
    transform: rotate(90deg); /* Points down in mobile view */
  }

  .arrow-indicator:hover {
    transform: scale(1.1) rotate(270deg); /* Adds 180deg flip from mobile base state */
  }

  .arrow-indicator:active {
    transform: scale(0.95) rotate(270deg);
  }

  .textareas-container {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .textarea-box textarea {
    min-height: 160px;
  }
}