:root {
  --bg-primary: #0A0A0B;
  --bg-secondary: #121214;
  --bg-card: rgba(24, 24, 27, 0.7);
  --border-color: rgba(63, 63, 70, 0.5);
  --border-hover: rgba(99, 102, 241, 0.5);
  
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  
  --accents-primary: #6366F1;
  --accents-primary-hover: #4F46E5;
  --accents-success: #10B981;
  --accents-error: #EF4444;
  --accents-warning: #F59E0B;
  
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', Courier, monospace;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vH;
  background-image: 
    radial-gradient(circle at 15% 50%, rgba(99, 102, 241, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 30%, rgba(16, 185, 129, 0.05) 0%, transparent 40%);
  background-attachment: fixed;
}

.app-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header */
.header {
  margin-bottom: 2.5rem;
  text-align: center;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo .icon {
  color: var(--accents-primary);
}

.logo h1 {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.025em;
}

.badge-secure {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--accents-success);
  padding: 0.375rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.8125rem;
  font-weight: 500;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1.0625rem;
  max-width: 600px;
  margin: 0 auto;
}

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Dropzone */
.dropzone {
  position: relative;
  border: 2px dashed var(--border-color);
  border-radius: 16px;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  padding: 4rem 2rem;
  text-align: center;
  transition: all 0.3s ease;
  cursor: pointer;
}

.dropzone:hover, .dropzone.drag-over {
  border-color: var(--accents-primary);
  background: rgba(99, 102, 241, 0.05);
}

.dropzone.drag-over {
  transform: scale(1.02);
}

.hidden-input {
  display: none;
}

.dropzone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.upload-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(99, 102, 241, 0.1);
  color: var(--accents-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.5rem;
  transition: transform 0.3s ease;
}

.dropzone:hover .upload-icon {
  transform: translateY(-5px);
}

.dropzone-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
}

.dropzone-content p {
  color: var(--text-secondary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  border-radius: 8px;
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  font-family: var(--font-sans);
}

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

.primary-btn:hover {
  background-color: var(--accents-primary-hover);
  transform: translateY(-1px);
}

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

.secondary-btn:hover {
  background-color: rgba(255, 255, 255, 0.05);
}

.icon-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.icon-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.1);
}

.controls-action {
  display: flex;
  justify-content: flex-end;
}

/* Results Container */
.results-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* File Card */
.file-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  backdrop-filter: blur(12px);
  animation: slideUp 0.3s ease-out forwards;
}

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

.file-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
}

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

.file-icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
}

.file-name {
  font-weight: 600;
  font-size: 1.0625rem;
  color: var(--text-primary);
  max-width: 400px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-size-type {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 0.125rem;
}

.progress-container {
  height: 4px;
  background: var(--bg-secondary);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 1.5rem;
}

.progress-bar {
  height: 100%;
  background: var(--accents-primary);
  width: 0%;
  transition: width 0.1s linear;
}

.verification-section {
  margin-bottom: 1.5rem;
}

.input-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.input-group {
  position: relative;
  display: flex;
  align-items: center;
}

.expected-hash-input {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  padding-right: 2.5rem;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  transition: border-color 0.2s ease;
}

.expected-hash-input:focus {
  outline: none;
  border-color: var(--accents-primary);
}

.expected-hash-input::placeholder {
  font-family: var(--font-sans);
  color: var(--text-muted);
}

.match-status {
  position: absolute;
  right: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
}

.match-status.success {
  color: var(--accents-success);
}

.match-status.error {
  color: var(--accents-error);
}

/* Hashes List */
.hashes-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.hash-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem;
  background: var(--bg-secondary);
  border-radius: 8px;
  border: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.hash-item.match {
  border-color: var(--accents-success);
  background: rgba(16, 185, 129, 0.05);
}

.hash-item.mismatch {
  border-color: var(--accents-error);
  background: rgba(239, 68, 68, 0.05);
}

.hash-type-label {
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text-secondary);
  width: 80px;
  flex-shrink: 0;
}

.hash-value-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  overflow: hidden;
}

.hash-value {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.hash-value.placeholder {
  color: var(--text-muted);
  font-style: italic;
  font-family: var(--font-sans);
}

.copy-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-secondary);
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.copy-btn:hover:not(:disabled) {
  background: var(--bg-primary);
  color: var(--text-primary);
  border-color: var(--border-hover);
}

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

/* Footer */
.footer {
  margin-top: 3rem;
  text-align: center;
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 500;
  font-size: 14px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
  border: 1px solid var(--border-color);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* Responsive */
@media (max-width: 640px) {
  .app-container {
    padding: 1rem;
  }
  
  .dropzone {
    padding: 2.5rem 1rem;
  }
  
  .hash-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
  
  .hash-value-container {
    width: 100%;
  }
}