/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Light theme colors */
  --primary: #4F46E5;
  --primary-dark: #4338CA;
  --primary-light: #818CF8;
  --secondary: #06B6D4;
  --success: #10B981;
  --warning: #F59E0B;
  --danger: #EF4444;
  
  --bg-primary: #FFFFFF;
  --bg-secondary: #F9FAFB;
  --bg-tertiary: #F3F4F6;
  
  --text-primary: #111827;
  --text-secondary: #6B7280;
  --text-tertiary: #9CA3AF;
  
  --border: #E5E7EB;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-secondary);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* Background decoration */
.bg-decoration {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.shape {
  position: absolute;
  border-radius: 50%;
  opacity: 0.03;
}

.shape-1 {
  width: 600px;
  height: 600px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  top: -200px;
  right: -200px;
  animation: float 20s ease-in-out infinite;
}

.shape-2 {
  width: 400px;
  height: 400px;
  background: linear-gradient(135deg, var(--secondary), var(--success));
  bottom: -100px;
  left: -100px;
  animation: float 25s ease-in-out infinite reverse;
}

.shape-3 {
  width: 300px;
  height: 300px;
  background: linear-gradient(135deg, var(--primary), var(--warning));
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation: float 30s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  33% { transform: translate(30px, -30px) rotate(120deg); }
  66% { transform: translate(-20px, 20px) rotate(240deg); }
}

/* Container */
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

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

.logo-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: var(--shadow-md);
}

.logo-icon svg {
  width: 28px;
  height: 28px;
}

.logo-text {
  font-size: 1.75rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.5px;
}

.logo-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: -0.25rem;
}

.security-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--success);
  color: white;
  border-radius: 100px;
  font-size: 0.875rem;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.badge-icon {
  font-size: 1rem;
}

/* Stats Bar */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat {
  background: var(--bg-primary);
  padding: 1.25rem;
  border-radius: var(--radius-lg);
  text-align: center;
  border: 1px solid var(--border);
  transition: all 0.3s ease;
}

.stat:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

/* Mode Tabs */
.mode-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2rem;
  background: var(--bg-primary);
  padding: 0.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

.tab-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.3s ease;
}

.tab-btn:hover {
  background: var(--bg-tertiary);
}

.tab-btn.active {
  background: var(--primary);
  color: white;
  box-shadow: var(--shadow-md);
}

.tab-icon {
  font-size: 1.25rem;
}

/* Mode Sections */
.mode-section {
  display: none;
  animation: fadeIn 0.3s ease;
}

.mode-section.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Card */
.card {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
}

.card-header {
  margin-bottom: 2rem;
}

.card-header h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.card-header p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

/* File Upload Area */
.file-upload-area {
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
  padding: 2rem;
  margin-bottom: 2rem;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
}

.file-upload-area:hover {
  border-color: var(--primary-light);
  background: var(--bg-tertiary);
}

.file-upload-area.dragover {
  border-color: var(--primary);
  background: rgba(79, 70, 229, 0.05);
}

.file-input {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  opacity: 0;
  cursor: pointer;
}

.upload-prompt {
  text-align: center;
  pointer-events: none;
}

.upload-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 1rem;
  color: var(--primary);
}

.upload-icon svg {
  width: 100%;
  height: 100%;
}

.upload-main {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

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

/* File Info */
.file-info {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.file-icon {
  font-size: 2rem;
}

.file-details {
  flex: 1;
}

.file-name {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.125rem;
}

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

.remove-file {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg-primary);
  color: var(--text-secondary);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  transition: all 0.2s ease;
}

.remove-file:hover {
  background: var(--danger);
  color: white;
  border-color: var(--danger);
}

/* Password Section */
.password-section {
  display: grid;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.password-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.label-hint {
  font-weight: 400;
  color: var(--text-tertiary);
  font-size: 0.8125rem;
}

.password-field {
  position: relative;
  display: flex;
  align-items: center;
}

.input {
  width: 100%;
  padding: 0.75rem 3rem 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 1rem;
  background: var(--bg-primary);
  transition: all 0.2s ease;
}

.input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.toggle-password {
  position: absolute;
  right: 0.75rem;
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: var(--text-tertiary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.toggle-password:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.eye-icon {
  width: 20px;
  height: 20px;
}

/* Password Strength */
.password-strength {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.strength-bar {
  flex: 1;
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: 100px;
  overflow: hidden;
}

.strength-fill {
  height: 100%;
  width: 0;
  transition: all 0.3s ease;
  border-radius: 100px;
}

.strength-text {
  font-size: 0.8125rem;
  font-weight: 500;
  min-width: 80px;
  text-align: right;
}

/* Strength levels */
.strength-0 .strength-fill { width: 0; background: var(--bg-tertiary); }
.strength-1 .strength-fill { width: 25%; background: var(--danger); }
.strength-2 .strength-fill { width: 50%; background: var(--warning); }
.strength-3 .strength-fill { width: 75%; background: var(--secondary); }
.strength-4 .strength-fill { width: 100%; background: var(--success); }

.strength-0 .strength-text { color: var(--text-tertiary); }
.strength-1 .strength-text { color: var(--danger); }
.strength-2 .strength-text { color: var(--warning); }
.strength-3 .strength-text { color: var(--secondary); }
.strength-4 .strength-text { color: var(--success); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-large {
  width: 100%;
  padding: 1rem 2rem;
  font-size: 1.125rem;
}

/* Spinner */
.spinner {
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Progress Section */
.progress-section {
  margin-top: 2rem;
  padding: 1.5rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.progress-title {
  font-weight: 600;
  color: var(--text-primary);
}

.progress-percent {
  font-weight: 700;
  color: var(--primary);
}

.progress-bar {
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: 100px;
  overflow: hidden;
  margin-bottom: 0.75rem;
}

.progress-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--primary), var(--primary-dark));
  border-radius: 100px;
  transition: width 0.3s ease;
}

.progress-status {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

/* Layer Progress */
.layer-progress {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
  gap: 0.5rem;
}

.layer-item {
  padding: 0.5rem;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  text-align: center;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-tertiary);
  transition: all 0.2s ease;
}

.layer-item.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
  animation: pulse 1s ease-in-out infinite;
}

.layer-item.completed {
  background: var(--success);
  color: white;
  border-color: var(--success);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/* Footer */
.footer {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
}

.footer-sub {
  color: var(--text-tertiary);
  font-size: 0.8125rem;
}

/* Toast Notifications */
#toast-container {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  padding: 1rem 1.5rem;
  background: white;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  animation: slideIn 0.3s ease;
  min-width: 300px;
}

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

.toast-icon {
  font-size: 1.25rem;
}

.toast-message {
  flex: 1;
  font-size: 0.9375rem;
  font-weight: 500;
}

.toast.success {
  border-left: 4px solid var(--success);
}

.toast.error {
  border-left: 4px solid var(--danger);
}

.toast.info {
  border-left: 4px solid var(--primary);
}

/* Responsive Design */
@media (max-width: 640px) {
  .container {
    padding: 1rem;
  }
  
  .header {
    flex-direction: column;
    text-align: center;
  }
  
  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .card {
    padding: 1.5rem;
  }
  
  .mode-tabs {
    flex-direction: column;
  }
  
  .layer-progress {
    grid-template-columns: repeat(4, 1fr);
  }
}