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

:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary: #ec4899;
  --success: #10b981;
  --background: #0f172a;
  --surface: #1e293b;
  --surface-light: #334155;
  --text: #f1f5f9;
  --text-secondary: #94a3b8;
  --border: #334155;
  --shadow: rgba(0, 0, 0, 0.3);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: var(--background);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

.background-animation {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(236, 72, 153, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 40% 20%, rgba(59, 130, 246, 0.1) 0%, transparent 50%);
  z-index: -1;
  animation: pulse 15s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.8; }
}

.container {
  max-width: 600px;
  margin: 0 auto;
  padding: 1rem;
  padding-bottom: 3.5rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.footer {
  text-align: center;
  padding: 0.75rem 0 0.5rem;
  margin-top: auto;
  color: var(--text-secondary);
  font-size: 0.8rem;
  flex-shrink: 0;
}

.footer p {
  margin: 0;
}

header {
  text-align: center;
  margin-bottom: 2.5rem;
  animation: fadeInDown 0.6s ease-out;
  position: relative;
}

.info-icon {
  position: fixed;
  top: 1rem;
  right: 1rem;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(99, 102, 241, 0.1);
  border: 2px solid rgba(99, 102, 241, 0.3);
  border-radius: 50%;
  color: var(--primary-light);
  cursor: pointer;
  transition: all 0.3s ease;
  z-index: 100;
  padding: 0;
}

.info-icon:hover {
  background: rgba(99, 102, 241, 0.2);
  border-color: var(--primary);
  transform: scale(1.1);
}

.info-icon svg {
  width: 20px;
  height: 20px;
}

.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(10px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  animation: fadeIn 0.3s ease-out;
}

.modal-content {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 1.5rem;
  max-width: 600px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem;
  border-bottom: 1px solid var(--border);
}

.modal-header h2 {
  font-size: 1.5rem;
  margin: 0;
}

.close-btn {
  background: none;
  border: none;
  color: var(--text);
  font-size: 2rem;
  cursor: pointer;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.5rem;
  transition: all 0.3s ease;
}

.close-btn:hover {
  background: var(--surface-light);
  transform: rotate(90deg);
}

.modal-body {
  padding: 2rem;
}

.modal-section {
  margin-bottom: 2.5rem;
}

.modal-section:last-child {
  margin-bottom: 0;
}

.section-title {
  font-size: 1.3rem;
  margin-bottom: 1.5rem;
  color: var(--primary-light);
  border-bottom: 2px solid var(--border);
  padding-bottom: 0.5rem;
}

.highlight-section {
  background: rgba(99, 102, 241, 0.05);
  padding: 1.5rem;
  border-radius: 1rem;
  border: 1px solid rgba(99, 102, 241, 0.2);
}

.step-number {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 1.1rem;
  flex-shrink: 0;
  color: white;
}

.security-item {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  padding: 1.25rem;
  background: var(--background);
  border-radius: 1rem;
  border: 1px solid var(--border);
}

.security-item:last-child {
  margin-bottom: 0;
}

.security-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.security-item h3,
.security-item h4 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  color: var(--text);
}

.security-item p {
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.6;
  font-size: 0.95rem;
}

.security-item strong {
  color: var(--primary-light);
  font-weight: 600;
}

.comparison-table {
  background: var(--background);
  border-radius: 1rem;
  overflow: hidden;
  border: 1px solid var(--border);
}

.comparison-row {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 1rem;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  align-items: center;
}

.comparison-row:last-child {
  border-bottom: none;
}

.comparison-row:hover {
  background: rgba(99, 102, 241, 0.05);
}

.comparison-feature {
  font-weight: 500;
  color: var(--text);
}

.comparison-us {
  color: var(--success);
  font-weight: 600;
  text-align: center;
}

.comparison-them {
  color: var(--text-secondary);
  text-align: center;
}

.trust-badge {
  margin-top: 2rem;
  padding: 1.5rem;
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(99, 102, 241, 0.1));
  border-radius: 1rem;
  border: 2px solid rgba(16, 185, 129, 0.3);
  text-align: center;
}

.trust-badge p {
  margin: 0;
  color: var(--text);
  font-size: 1rem;
  line-height: 1.6;
}

.confirm-modal {
  max-width: 450px;
}

.modal-footer {
  display: flex;
  gap: 1rem;
  padding: 1.5rem 2rem 2rem;
  border-top: 1px solid var(--border);
}

.modal-footer .btn {
  flex: 1;
  margin: 0;
}

.notification {
  position: fixed;
  top: 2rem;
  right: 2rem;
  z-index: 2000;
  animation: slideInRight 0.3s ease-out;
  max-width: 400px;
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(100px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.notification-content {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 1rem;
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  box-shadow: 0 10px 40px var(--shadow);
}

.notification-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.notification-content p {
  margin: 0;
  color: var(--text);
  font-size: 1rem;
}

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

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
  margin-left: -3rem;
}

.logo svg {
  width: 40px;
  height: 40px;
  color: var(--primary);
}

.logo h1 {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tagline {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.mode-selection {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  animation: fadeIn 0.6s ease-out 0.2s both;
  margin-bottom: 0;
}

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

.mode-card {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 1.5rem;
  padding: 1.75rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.mode-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.mode-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary);
  box-shadow: 0 20px 40px var(--shadow);
}

.mode-card:hover::before {
  opacity: 0.1;
}

.mode-icon {
  position: relative;
  width: 70px;
  height: 70px;
  margin: 0 auto 1rem;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transform-style: preserve-3d;
}

.mode-card:hover .mode-icon {
  animation: float 2s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.mode-icon svg {
  width: 40px;
  height: 40px;
  color: white;
}

.mode-card h2 {
  font-size: 1.35rem;
  margin-bottom: 0.5rem;
}

.mode-card p {
  color: var(--text-secondary);
}

.why-choose-btn {
  grid-column: 1 / -1;
  width: 100%;
  margin-top: 0;
  padding: 0.875rem 1.5rem;
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.15), rgba(99, 102, 241, 0.15));
  border: 2px solid rgba(99, 102, 241, 0.3);
  border-radius: 1rem;
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.why-choose-btn:hover {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.25), rgba(99, 102, 241, 0.25));
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(99, 102, 241, 0.3);
}

.why-choose-btn svg {
  width: 24px;
  height: 24px;
  color: var(--primary-light);
}

.interface {
  animation: fadeIn 0.6s ease-out;
}

.card {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 1.5rem;
  padding: 2.5rem;
  margin-bottom: 1.5rem;
}

.room-code-display {
  text-align: center;
  margin-bottom: 2rem;
}

.label {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.code-box {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 1rem;
}

.code {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: 0.5rem;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-family: 'Courier New', monospace;
}

.icon-btn {
  background: var(--surface-light);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
  color: var(--text);
}

.icon-btn:hover {
  background: var(--primary);
  border-color: var(--primary);
  transform: scale(1.05);
}

.icon-btn svg {
  width: 20px;
  height: 20px;
}

.status-message {
  text-align: center;
  padding: 2rem;
}

.spinner {
  width: 50px;
  height: 50px;
  margin: 0 auto 1rem;
  border: 4px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.file-input-wrapper {
  margin-bottom: 1.5rem;
}

#file-input {
  display: none;
}

.file-input-label {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 3rem 2rem;
  border: 2px dashed var(--border);
  border-radius: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
  background: var(--background);
}

.file-input-label:hover {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.05);
}

.file-input-label svg {
  width: 48px;
  height: 48px;
  color: var(--primary);
}

.file-input-label span {
  font-size: 1.1rem;
  font-weight: 500;
}

.file-list {
  background: var(--background);
  border-radius: 1rem;
  padding: 1rem;
  margin-bottom: 1.5rem;
}

.file-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--surface);
  border-radius: 0.75rem;
  margin-bottom: 0.5rem;
}

.file-item:last-child {
  margin-bottom: 0;
}

.file-item svg {
  width: 24px;
  height: 24px;
  color: var(--primary);
  flex-shrink: 0;
}

.file-info {
  flex: 1;
}

.file-name {
  font-weight: 500;
  margin-bottom: 0.25rem;
}

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

.btn {
  width: 100%;
  padding: 1rem 2rem;
  border: none;
  border-radius: 1rem;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn svg {
  width: 20px;
  height: 20px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  box-shadow: 0 10px 20px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 30px rgba(99, 102, 241, 0.4);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--surface-light);
  color: var(--text);
  border: 1px solid var(--border);
  margin-top: 1rem;
}

.btn-secondary:hover {
  background: var(--border);
}

.btn-danger {
  background: linear-gradient(135deg, #ef4444, #dc2626);
  color: white;
  box-shadow: 0 10px 20px rgba(239, 68, 68, 0.3);
  margin-top: 1rem;
}

.btn-danger:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 30px rgba(239, 68, 68, 0.4);
}

.btn-danger:active {
  transform: translateY(0);
}

.code-input-section {
  text-align: center;
}

.code-input {
  width: 100%;
  padding: 1.5rem;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.5rem;
  text-align: center;
  background: var(--background);
  border: 2px solid var(--border);
  border-radius: 1rem;
  color: var(--text);
  margin: 1rem 0 1.5rem;
  text-transform: uppercase;
  font-family: 'Courier New', monospace;
}

.code-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.progress-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.progress-bar {
  width: 100%;
  height: 12px;
  background: var(--background);
  border-radius: 1rem;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 1rem;
  transition: width 0.3s ease;
  position: relative;
  overflow: hidden;
}

.progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.3),
    transparent
  );
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.success-message {
  text-align: center;
  padding: 2rem;
  animation: scaleIn 0.5s ease-out;
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.8);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.success-message svg {
  width: 80px;
  height: 80px;
  color: var(--success);
  margin-bottom: 1rem;
}

.success-message p {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--success);
}

.connected-status {
  text-align: center;
  padding: 2rem;
  background: rgba(16, 185, 129, 0.1);
  border: 2px solid rgba(16, 185, 129, 0.3);
  border-radius: 1rem;
  margin-bottom: 2rem;
  animation: scaleIn 0.5s ease-out;
}

.connected-status svg {
  width: 60px;
  height: 60px;
  color: var(--success);
  margin-bottom: 1rem;
}

.connected-status h3 {
  font-size: 1.5rem;
  color: var(--success);
  margin: 0 0 0.5rem;
}

.connected-status p {
  color: var(--text-secondary);
  margin: 0;
}

.ready-status {
  text-align: center;
  padding: 2rem;
  background: rgba(99, 102, 241, 0.1);
  border: 2px solid rgba(99, 102, 241, 0.3);
  border-radius: 1rem;
  margin-bottom: 1rem;
  animation: scaleIn 0.5s ease-out;
}

.ready-icon {
  font-size: 3rem;
  margin-bottom: 0.5rem;
}

.ready-status p {
  color: var(--text);
  font-size: 1.1rem;
  margin: 0;
}

.transfer-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1rem;
  padding: 1rem;
  background: var(--background);
  border-radius: 0.75rem;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

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

.stat-value {
  color: var(--text);
  font-size: 1.1rem;
  font-weight: 600;
  font-family: 'Courier New', monospace;
}

.qr-section {
  margin-top: 2rem;
  text-align: center;
}

.qr-code {
  display: inline-block;
  padding: 1rem;
  background: white;
  border-radius: 1rem;
  margin-top: 1rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.qr-code canvas {
  display: block;
  border-radius: 0.5rem;
}

.divider {
  display: flex;
  align-items: center;
  text-align: center;
  margin: 1.5rem 0;
  color: var(--text-secondary);
}

.divider::before,
.divider::after {
  content: '';
  flex: 1;
  border-bottom: 1px solid var(--border);
}

.divider span {
  padding: 0 1rem;
  font-size: 0.875rem;
  font-weight: 600;
}

.qr-scanner-container {
  background: var(--surface);
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  max-width: 600px;
  margin: 0 auto;
}

.qr-scanner-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.qr-scanner-header h2 {
  margin: 0;
  font-size: 1.5rem;
}

.qr-scanner-reader {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--background);
  position: relative;
  min-height: 400px;
}

.qr-scanner-reader video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.qr-scanner-hint {
  text-align: center;
  padding: 2rem;
  color: var(--text-secondary);
  margin: 0;
  background: var(--surface);
  font-size: 1.1rem;
}

#qr-scanner-modal {
  padding: 0;
}

#qr-scanner-modal .modal-content {
  max-width: 100%;
  max-height: 100%;
  margin: 0;
  border-radius: 0;
}

.hidden {
  display: none !important;
}

@media (max-width: 640px) {
  .container {
    padding: 0.75rem;
    padding-top: 1rem;
    justify-content: flex-start;
  }

  header {
    margin-bottom: 1.5rem;
    margin-top: 1rem;
  }

  .mode-selection {
    gap: 1rem;
    grid-template-columns: 1fr;
  }

  .logo h1 {
    font-size: 2.25rem;
    margin-bottom: 0.25rem;
  }

  .logo svg {
    width: 50px;
    height: 50px;
  }

  .tagline {
    font-size: 1rem;
    margin-top: 0.25rem;
  }

  .code {
    font-size: 1.75rem;
    letter-spacing: 0.25rem;
    padding: 0.75rem;
  }

  .card {
    padding: 1.25rem;
    margin-bottom: 1rem;
  }

  .mode-card {
    padding: 2rem 1.5rem;
    margin-bottom: 0;
  }

  .mode-card h2 {
    font-size: 1.75rem;
  }

  .mode-card p {
    font-size: 1rem;
  }

  .transfer-stats {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .connected-status svg {
    width: 40px;
    height: 40px;
  }

  .connected-status h3 {
    font-size: 1.1rem;
  }

  .connected-status p {
    font-size: 0.9rem;
  }

  .btn {
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
  }

  .modal-content {
    max-height: 85vh;
  }

  .modal-header {
    padding: 1.25rem;
  }

  .modal-body {
    padding: 1.25rem;
  }

  .security-item {
    gap: 0.75rem;
    margin-bottom: 1rem;
  }

  .security-item h3 {
    font-size: 1rem;
  }

  .security-item p {
    font-size: 0.85rem;
  }

  .info-icon {
    width: 36px;
    height: 36px;
    top: 0.75rem;
    right: 0.75rem;
  }

  .info-icon svg {
    width: 18px;
    height: 18px;
  }

  .footer {
    padding: 0.5rem 0;
    margin-top: 0.5rem;
    font-size: 0.7rem;
  }

  .mode-card {
    padding: 1.5rem 1.25rem;
  }

  .mode-card h2 {
    font-size: 1.35rem;
  }

  .why-choose-btn {
    margin-top: 0;
    padding: 0.75rem 1.25rem;
    font-size: 0.85rem;
  }

  .why-choose-btn svg {
    width: 20px;
    height: 20px;
  }
}