:root {
  --bg-color: #050505;
  --glass-bg: rgba(255, 255, 255, 0.03);
  --glass-border: rgba(255, 255, 255, 0.1);
  --accent-color: #00f2fe;
  --accent-secondary: #4facfe;
  --text-primary: #ffffff;
  --text-secondary: #b0b0b0;
  --shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.8);
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-main);
  height: 100vh;
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  background-image: 
    radial-gradient(circle at 20% 20%, rgba(79, 172, 254, 0.1) 0%, transparent 40%),
    radial-gradient(circle at 80% 80%, rgba(0, 242, 254, 0.1) 0%, transparent 40%);
  position: relative;
}

body::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('https://www.transparenttextures.com/patterns/carbon-fibre.png');
  opacity: 0.05;
  pointer-events: none;
}

#app {
  width: 100%;
  max-width: 1200px;
  height: 90vh;
  padding: 2rem;
  display: flex;
  flex-direction: column;
}

/* Glassmorphism utility */
.glass {
  background: rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 24px;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.36);
}

/* Login Modal */
#login-screen {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 100;
  transition: opacity 0.5s ease;
}

.login-card {
  width: 400px;
  padding: 3rem;
  text-align: center;
}

.login-card h1 {
  font-size: 2rem;
  margin-bottom: 2rem;
  background: linear-gradient(45deg, var(--accent-color), var(--accent-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.input-group {
  margin-bottom: 1.5rem;
  text-align: left;
}

.input-group label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

input[type="text"], input[type="password"] {
  width: 100%;
  padding: 0.8rem 1rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  color: white;
  outline: none;
  transition: border 0.3s ease;
}

input:focus {
  border-color: var(--accent-color);
}

button {
  width: 100%;
  padding: 1rem;
  background: linear-gradient(45deg, var(--accent-color), var(--accent-secondary));
  border: none;
  border-radius: 8px;
  color: #000;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

button:hover {
  transform: translateY(-2px);
  opacity: 0.9;
}

/* Main UI */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

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

.avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-color);
  display: flex;
  justify-content: center;
  align-items: center;
  color: #000;
  font-weight: bold;
}

main {
  flex: 1;
  display: grid;
  grid-template-columns: 350px 1fr;
  gap: 2rem;
  overflow: hidden;
}

.upload-section {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
}

.dropzone {
  flex: 1;
  border: 2px dashed var(--glass-border);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  cursor: pointer;
  transition: background 0.3s ease;
}

.dropzone:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--accent-color);
}

.dropzone i {
  font-size: 3rem;
  color: var(--accent-color);
}

.file-list-section {
  padding: 1.5rem;
  overflow-y: auto;
}

.file-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  border-bottom: 1px solid var(--glass-border);
  transition: background 0.2s ease;
}

.file-item:hover {
  background: rgba(255, 255, 255, 0.02);
}

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

.file-name {
  font-weight: 500;
}

.file-size {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.actions button {
  width: auto;
  padding: 0.5rem 1rem;
  font-size: 0.8rem;
  background: transparent;
  border: 1px solid var(--accent-color);
  color: var(--accent-color);
}

.actions button:hover {
  background: var(--accent-color);
  color: #000;
}

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

.fade-in {
  animation: fadeIn 0.5s ease forwards;
}

/* Progress Bar */
.progress-container {
  margin-top: 1rem;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
  overflow: hidden;
  display: none;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: var(--accent-color);
  transition: width 0.3s ease;
}