/* Global styles and variables */
:root {
  --primary-color: #4a6bff;
  --primary-hover: #3a5bf0;
  --success-color: #22c55e;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --bg-light: #f8fafc;
  --bg-white: #ffffff;
  --bg-blue-50: #eff6ff;
  --border-color: #e2e8f0;
  --border-active: #cbd5e1;
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --transition: all 0.2s ease-in-out;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --max-width: 1200px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  line-height: 1.5;
  background-color: var(--bg-light);
}

/* Container and layout */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1rem;
}

.main-content {
  flex: 1;
  padding: 2rem 0;
}

@media (min-width: 640px) {
  .container {
    padding: 0 1.5rem;
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 2rem;
  }
  
  .main-content {
    padding: 3rem 0;
  }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.25;
  margin-bottom: 0.5rem;
}

.main-title {
  font-size: 1.875rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  text-align: center;
}

.subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  text-align: center;
}

/* Header */
.header {
  background-color: var(--bg-white);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

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

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-color);
}

.main-nav {
  display: none;
}

.nav-link {
  margin-left: 1.5rem;
  font-weight: 500;
  color: var(--text-primary);
  text-decoration: none;
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--primary-color);
}

.auth-buttons {
  display: none;
}

.mobile-menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 1.25rem;
  color: var(--text-primary);
}

@media (min-width: 768px) {
  .main-nav {
    display: flex;
  }
  
  .auth-buttons {
    display: flex;
  }
  
  .mobile-menu-toggle {
    display: none;
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.5;
  border-radius: var(--radius-md);
  transition: var(--transition);
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--primary-color);
  color: white;
  border: 1px solid transparent;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
}

.btn-outline {
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-outline:hover {
  background-color: var(--bg-light);
  border-color: var(--border-active);
}

.btn-ghost {
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid transparent;
}

.btn-ghost:hover {
  background-color: var(--bg-light);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Cards */
.card {
  background-color: var(--bg-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.header-left {
  display: flex;
  align-items: center;
}

.header-left i {
  font-size: 1.25rem;
  margin-right: 0.75rem;
  color: var(--primary-color);
}

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0;
}

.word-counter {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Tabs */
.tabs {
  padding: 1.25rem;
}

.tabs-list {
  display: flex;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1.25rem;
}

.tab-trigger {
  background: none;
  border: none;
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  position: relative;
}

.tab-trigger.active {
  color: var(--primary-color);
}

.tab-trigger.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--primary-color);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Text Editor */
.text-editor-container {
  position: relative;
}

.textarea-wrapper {
  position: relative;
}

.text-editor {
  width: 100%;
  min-height: 200px;
  padding: 1rem;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  resize: vertical;
  background-color: var(--bg-white);
  transition: var(--transition);
}

.text-editor:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(74, 107, 255, 0.2);
}

.text-editor-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background-color: var(--bg-white);
  pointer-events: none;
}

.info-message {
  max-width: 350px;
  text-align: center;
}

.info-message i {
  font-size: 2rem;
  margin-bottom: 0.75rem;
  color: var(--text-secondary);
}

.info-message p {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.text-stats {
  display: flex;
  justify-content: space-between;
  margin-top: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.stat-group {
  display: flex;
  gap: 1rem;
}

.warning-message {
  display: flex;
  align-items: flex-start;
  margin-top: 0.75rem;
  padding: 0.75rem;
  background-color: #fff8e1;
  border-radius: var(--radius-md);
  border-left: 3px solid var(--warning-color);
}

.warning-message i {
  font-size: 1rem;
  margin-right: 0.5rem;
  color: var(--warning-color);
}

.warning-message p {
  font-size: 0.75rem;
  color: var(--text-primary);
}

/* File Uploader */
.file-uploader {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  text-align: center;
  background-color: var(--bg-white);
  transition: var(--transition);
}

.file-uploader:hover, .file-uploader.dragging {
  border-color: var(--primary-color);
  background-color: var(--bg-blue-50);
}

.drop-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.icon-container {
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-blue-50);
  margin-bottom: 0.5rem;
}

.icon-container i {
  font-size: 1.5rem;
  color: var(--primary-color);
}

.upload-message {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
}

.upload-hint {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.divider {
  width: 100%;
  display: flex;
  align-items: center;
  margin: 0.75rem 0;
}

.divider::before, .divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-color);
}

.divider span {
  padding: 0 0.75rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.file-select-btn {
  margin-top: 0.5rem;
}

.uploaded-file {
  margin-top: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem;
  background-color: var(--bg-blue-50);
  border-radius: var(--radius-md);
}

.file-info {
  display: flex;
  align-items: center;
}

.file-info i {
  font-size: 1rem;
  margin-right: 0.5rem;
  color: var(--primary-color);
}

/* Action Bar */
.action-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.premium-indicator {
  display: flex;
  align-items: center;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.premium-indicator i {
  margin-right: 0.5rem;
  color: var(--primary-color);
}

/* Results Section */
.results-display {
  margin-top: 2rem;
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
}

.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.results-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0;
}

.export-btn {
  display: flex;
  align-items: center;
}

.export-btn i {
  margin-right: 0.5rem;
}

/* Summary Cards */
.summary-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

@media (min-width: 640px) {
  .summary-cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .summary-cards {
    grid-template-columns: repeat(3, 1fr);
  }
}

.summary-card {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.summary-card .card-header {
  background-color: var(--bg-light);
  padding: 0.75rem 1rem;
}

.card-subtitle {
  display: flex;
  align-items: center;
  font-size: 0.875rem;
  font-weight: 500;
}

.card-subtitle i {
  margin-right: 0.5rem;
  color: var(--primary-color);
}

.card-content {
  padding: 1rem;
}

.score-display {
  text-align: center;
  margin-bottom: 0.75rem;
}

.score-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-color);
}

.progress-bar {
  height: 0.5rem;
  background-color: var(--bg-light);
  border-radius: 9999px;
  overflow: hidden;
  margin-top: 0.5rem;
}

.progress-fill {
  height: 100%;
  background-color: var(--primary-color);
  border-radius: 9999px;
  transition: width 0.3s ease;
}

.progress-blue {
  background-color: #3b82f6;
}

.score-status {
  font-size: 0.875rem;
  text-align: center;
  color: var(--text-secondary);
}

.stat-list {
  display: grid;
  gap: 0.75rem;
}

.stat-item {
  display: flex;
  justify-content: space-between;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.stat-value {
  font-size: 0.875rem;
  font-weight: 500;
}

.readability-description {
  font-size: 0.75rem;
  text-align: center;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

/* Detailed Results */
.detailed-results {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .detailed-results {
    grid-template-columns: repeat(2, 1fr);
  }
}

.content-analysis, .analyzed-text {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.analysis-header {
  background-color: var(--bg-light);
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
}

.analysis-title {
  display: flex;
  align-items: center;
  font-size: 1rem;
  font-weight: 600;
  margin: 0;
}

.analysis-title i {
  margin-right: 0.5rem;
  color: var(--primary-color);
}

.analysis-content {
  padding: 1rem;
  max-height: 400px;
  overflow-y: auto;
}

.matches-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.match-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.match-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  background-color: var(--bg-light);
  border-bottom: 1px solid var(--border-color);
}

.match-source {
  display: flex;
  align-items: center;
}

.match-icon {
  margin-right: 0.5rem;
}

.match-category {
  font-size: 0.875rem;
  font-weight: 500;
}

.match-similarity {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--danger-color);
}

.match-text {
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  background-color: var(--bg-white);
}

.match-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 1rem;
  background-color: var(--bg-light);
  border-top: 1px solid var(--border-color);
  font-size: 0.75rem;
}

.match-link {
  color: var(--primary-color);
  text-decoration: none;
  display: flex;
  align-items: center;
}

.match-link i {
  margin-right: 0.25rem;
}

.match-date {
  display: flex;
  align-items: center;
  color: var(--text-secondary);
}

.match-date i {
  margin-right: 0.25rem;
}

.source-distribution {
  margin-bottom: 1rem;
}

.distribution-title {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.source-types {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.source-type {
  display: flex;
  align-items: center;
  font-size: 0.75rem;
}

.source-type i {
  margin-right: 0.5rem;
  font-size: 0.875rem;
}

.blue-icon {
  color: #3b82f6;
}

.green-icon {
  color: #22c55e;
}

.purple-icon {
  color: #8b5cf6;
}

.text-content {
  font-size: 0.875rem;
  line-height: 1.6;
  max-height: 300px;
  overflow-y: auto;
  background-color: var(--bg-white);
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

/* Footer */
.footer {
  background-color: var(--bg-white);
  border-top: 1px solid var(--border-color);
  padding: 1.5rem 0;
}

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

.copyright {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(255, 255, 255, 0.9);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid rgba(74, 107, 255, 0.3);
  border-radius: 50%;
  border-top-color: var(--primary-color);
  animation: spin 1s linear infinite;
  margin-bottom: 1rem;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 1000;
  max-width: 350px;
}

.toast {
  display: flex;
  align-items: flex-start;
  background-color: var(--bg-white);
  border-left: 4px solid var(--primary-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 0.75rem 1rem;
  animation: slide-in 0.3s ease;
}

.toast.success {
  border-left-color: var(--success-color);
}

.toast.error {
  border-left-color: var(--danger-color);
}

.toast.warning {
  border-left-color: var(--warning-color);
}

.toast-content {
  flex: 1;
}

.toast-title {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.toast-message {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.toast-close {
  background: none;
  border: none;
  font-size: 1rem;
  color: var(--text-secondary);
  cursor: pointer;
  margin-left: 0.5rem;
}

@keyframes slide-in {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* Plagiarism Checker Container */
.plagiarism-checker-container {
  max-width: 900px;
  margin: 0 auto;
}

@media (max-width: 767px) {
  .plagiarism-checker-container {
    padding: 0 1rem;
  }
  
  .action-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .match-footer {
    flex-direction: column;
    gap: 0.5rem;
    align-items: flex-start;
  }
}