:root {
  --primary-color: #3B82F6;
  --primary-dark: #2563EB;
  --secondary-color: #10B981;
  --danger-color: #EF4444;
  --warning-color: #F59E0B;
  --background: #F9FAFB;
  --surface: #FFFFFF;
  --text-primary: #1F2937;
  --text-secondary: #6B7280;
  --border-color: #E5E7EB;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--background);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Navbar */
.navbar {
  background-color: var(--surface);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 20px;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--primary-color);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.3s;
}

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

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-primary);
  cursor: pointer;
}

/* Main Content */
.main-content {
  flex: 1;
  padding: 2rem 0;
}

/* Hero Section */
.hero-section {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 4rem 0;
  text-align: center;
}

.hero-title {
  font-size: 3rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.9;
}

.hero-features {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.hero-features .feature {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.1);
  padding: 0.5rem 1rem;
  border-radius: 2rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s;
}

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

.btn-primary:hover {
  background-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background-color: var(--secondary-color);
  color: white;
}

.btn-secondary:hover {
  background-color: #059669;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-outline {
  background-color: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

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

.btn-large {
  padding: 1rem 2rem;
  font-size: 1.1rem;
}

.btn-small {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
}

/* Features Section */
.features-section {
  padding: 4rem 0;
}

.section-title {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--text-primary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: var(--surface);
  padding: 2rem;
  border-radius: 1rem;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform 0.3s;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  font-size: 3rem;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.feature-card h3 {
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-primary);
}

.form-control {
  width: 100%;
  padding: 0.75rem;
  border: 2px solid var(--border-color);
  border-radius: 0.5rem;
  font-size: 1rem;
  transition: border-color 0.3s;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
}

.form-control-large {
  padding: 1rem;
  font-size: 1.1rem;
}

.textarea-large {
  min-height: 300px;
  resize: vertical;
}

.textarea-medium {
  min-height: 150px;
  resize: vertical;
}

/* Upload Area */
.upload-area {
  border: 3px dashed var(--border-color);
  border-radius: 1rem;
  padding: 3rem;
  text-align: center;
  background: var(--surface);
  transition: all 0.3s;
  cursor: pointer;
}

.upload-area:hover {
  border-color: var(--primary-color);
  background: #F0F9FF;
}

.upload-area.drag-over {
  border-color: var(--primary-color);
  background: #EBF8FF;
}

.upload-icon {
  font-size: 4rem;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.file-list {
  margin-top: 2rem;
}

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
  background: var(--surface);
  border-radius: 0.5rem;
  margin-bottom: 0.5rem;
  box-shadow: var(--shadow);
}

.file-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Alerts */
.alert {
  padding: 1rem;
  border-radius: 0.5rem;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.alert-success {
  background-color: #D1FAE5;
  color: #065F46;
  border: 1px solid #6EE7B7;
}

.alert-error {
  background-color: #FEE2E2;
  color: #991B1B;
  border: 1px solid #FCA5A5;
}

/* Page Container */
.page-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 20px;
}

.page-title {
  font-size: 2rem;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Tab Container */
.tab-container {
  background: var(--surface);
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.tab-buttons {
  display: flex;
  background: var(--background);
}

.tab-btn {
  flex: 1;
  padding: 1rem;
  border: none;
  background: none;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.tab-btn.active {
  background: var(--surface);
  color: var(--primary-color);
  border-bottom: 3px solid var(--primary-color);
}

.tab-content {
  padding: 2rem;
  display: none;
}

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

/* Info Section */
.info-section {
  background: var(--surface);
  padding: 2rem;
  border-radius: 1rem;
  margin-top: 2rem;
  box-shadow: var(--shadow);
}

.info-section h3 {
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.info-section ul {
  list-style: none;
}

.info-section li {
  padding: 0.5rem 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.info-section i {
  color: var(--secondary-color);
}

/* Share Section */
.share-section {
  background: #F0F9FF;
  padding: 1.5rem;
  border-radius: 0.5rem;
  margin-top: 2rem;
}

.share-box {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.share-box input {
  flex: 1;
}

/* File Grid */
.file-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.file-card {
  background: var(--surface);
  padding: 1.5rem;
  border-radius: 0.5rem;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform 0.3s;
}

.file-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.file-card .file-icon {
  font-size: 3rem;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.file-name {
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-size {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

/* Text View */
.text-content {
  background: var(--surface);
  padding: 2rem;
  border-radius: 0.5rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.5rem;
}

.text-content pre {
  white-space: pre-wrap;
  word-wrap: break-word;
  font-family: 'Consolas', 'Monaco', monospace;
  line-height: 1.5;
}

/* Success Container */
.success-container {
  text-align: center;
  padding: 3rem 0;
}

.success-icon {
  font-size: 5rem;
  color: var(--secondary-color);
  margin-bottom: 1.5rem;
}

.key-display {
  background: var(--surface);
  padding: 2rem;
  border-radius: 0.5rem;
  margin: 2rem 0;
  box-shadow: var(--shadow);
}

.key-box {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1rem;
  padding: 1rem;
  background: var(--background);
  border-radius: 0.5rem;
}

.key-box code {
  flex: 1;
  font-family: monospace;
  font-size: 1.2rem;
  word-break: break-all;
}

/* Warning Box */
.warning-box {
  background: #FEF3C7;
  color: #92400E;
  padding: 1rem;
  border-radius: 0.5rem;
  margin: 1.5rem 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Action Buttons */
.action-buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}

/* Steps */
.steps {
  margin-top: 2rem;
}

.step {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.step-number {
  width: 40px;
  height: 40px;
  background: var(--primary-color);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  flex-shrink: 0;
}

.step-content h3 {
  margin-bottom: 0.5rem;
}

/* Rating Stars */
.rating-stars {
  display: flex;
  gap: 0.5rem;
  flex-direction: row-reverse;
  justify-content: flex-end;
}

.rating-stars input {
  display: none;
}

.rating-stars label {
  cursor: pointer;
  color: #ddd;
  font-size: 1.5rem;
  transition: color 0.3s;
}

.rating-stars input:checked ~ label,
.rating-stars label:hover,
.rating-stars label:hover ~ label {
  color: #FFD700;
}

/* Footer */
.footer {
  background: var(--surface);
  border-top: 1px solid var(--border-color);
  padding: 3rem 0 1rem;
  margin-top: auto;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h4 {
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: 0.5rem;
}

.footer-section a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.3s;
}

.footer-section a:hover {
  color: var(--primary-color);
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
}

/* Public Texts */
.text-list {
  margin-top: 2rem;
}

.text-item {
  background: var(--surface);
  padding: 1.5rem;
  border-radius: 0.5rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow);
}

.text-preview {
  margin-bottom: 1rem;
  color: var(--text-primary);
  font-size: 0.95rem;
  line-height: 1.5;
}

.text-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

/* Character Count */
.char-count {
  text-align: right;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

/* Recent Content Section */
.recent-content-section {
  padding: 4rem 0;
  background: var(--background);
}

.content-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin-top: 2rem;
}

.tab-section h3 {
  color: var(--primary-color);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.file-details {
  display: flex;
  flex-direction: column;
}

.file-name {
  font-weight: 500;
  color: var(--text-primary);
}

.file-time {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* CTA Section */
.cta-section {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 4rem 0;
  text-align: center;
  margin: 4rem 0;
  border-radius: 1rem;
}

.cta-section h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.cta-section p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.9;
}

.cta-buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.cta-buttons .btn-outline {
  border-color: white;
  color: white;
}

.cta-buttons .btn-outline:hover {
  background: white;
  color: var(--primary-color);
}

/* Error Container */
.error-container {
  text-align: center;
  padding: 4rem 0;
}

.error-icon {
  font-size: 5rem;
  color: var(--danger-color);
  margin-bottom: 1.5rem;
}

.error-message {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.error-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

/* Access Container */
.access-container {
  max-width: 500px;
  margin: 0 auto;
  background: var(--surface);
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: var(--shadow);
}

/* How It Works */
.how-it-works {
  max-width: 800px;
  margin: 0 auto;
}

.step-section {
  margin-bottom: 3rem;
}

.step-section h2 {
  color: var(--primary-color);
  margin-bottom: 1.5rem;
}

/* FAQ */
.faq-section {
  background: var(--surface);
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: var(--shadow);
}

.faq-item {
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.faq-item:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.faq-item h3 {
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

/* Feedback Container */
.feedback-container {
  max-width: 600px;
  margin: 0 auto;
  background: var(--surface);
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: var(--shadow);
}

.feedback-intro {
  text-align: center;
  margin-bottom: 2rem;
  color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--surface);
    flex-direction: column;
    padding: 1rem;
    box-shadow: var(--shadow-lg);
  }

  .nav-links.active {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

  .hero-title {
    font-size: 2rem;
  }

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

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .share-box {
    flex-direction: column;
  }

  .tab-buttons {
    flex-direction: column;
  }

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

  .content-tabs {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}