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

:root {
  /* Light Theme Colors */
  --color-primary: #000000;
  --color-primary-soft: #262626;
  --color-secondary: #ffffff;
  --color-surface: #ffffff;
  --color-surface-elevated: #fafafa;
  --color-surface-subtle: #f5f5f5;
  --color-border: #e5e5e5;
  --color-border-subtle: #f0f0f0;
  --color-text-primary: #000000;
  --color-text-secondary: #525252;
  --color-text-tertiary: #737373;
  --color-accent: #ff3b30;
  --color-accent-dark: #e60012;
  --color-success: #00ff88;
  --color-warning: #ff9500;
  
  /* Shadow system */
  --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);
  
  /* Background gradients */
  --bg-gradient: linear-gradient(135deg, #fafafa 0%, #f5f5f5 100%);
  --glass-bg: rgba(255, 255, 255, 0.8);
  --glass-border: rgba(255, 255, 255, 0.2);
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;
  
  /* Spacing & Sizing */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;
  
  /* Animations */
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  --transition-slow: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* Dark Theme Variables */
[data-theme="dark"] {
  --color-primary: #ffffff;
  --color-primary-soft: #e5e5e5;
  --color-secondary: #000000;
  --color-surface: #111111;
  --color-surface-elevated: #1a1a1a;
  --color-surface-subtle: #202020;
  --color-border: #333333;
  --color-border-subtle: #2a2a2a;
  --color-text-primary: #ffffff;
  --color-text-secondary: #a3a3a3;
  --color-text-tertiary: #737373;
  --bg-gradient: linear-gradient(135deg, #0a0a0a 0%, #111111 100%);
  --glass-bg: rgba(0, 0, 0, 0.8);
  --glass-border: rgba(255, 255, 255, 0.1);
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.7);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.8);
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }
}

body {
  font-family: var(--font-primary);
  background: var(--bg-gradient);
  color: var(--color-text-primary);
  line-height: 1.6;
  font-weight: 400;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: var(--transition-slow);
}

.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

@media (min-width: 768px) {
  .container {
    padding: 0 2rem;
  }
}

/* Header */
.header {
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: var(--transition-slow);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
  max-width: 1200px;
  margin: 0 auto;
}

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

.brand-icon {
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-matrix {
  width: 20px;
  height: 20px;
  background: var(--color-secondary);
  border-radius: 2px;
  position: relative;
}

.brand-matrix::before,
.brand-matrix::after {
  content: '';
  position: absolute;
  background: var(--color-primary);
}

.brand-matrix::before {
  width: 2px;
  height: 20px;
  left: 50%;
  top: 0;
  transform: translateX(-50%);
}

.brand-matrix::after {
  width: 20px;
  height: 2px;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
}

.brand-title {
  font-size: 1.625rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-text-primary);
  font-family: var(--font-mono);
  text-transform: lowercase;
}

.brand-accent {
  color: var(--color-accent);
  animation: pulse-accent 3s ease-in-out infinite;
}

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

/* Theme Toggle */
.theme-toggle-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.toggle-label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.theme-toggle {
  background: none;
  border: none;
  padding: 4px;
  cursor: pointer;
  border-radius: var(--radius-full);
  transition: var(--transition);
  border: 2px solid var(--color-border);
}

.theme-toggle:hover {
  border-color: var(--color-accent);
  transform: scale(1.05);
}

.toggle-track {
  width: 60px;
  height: 32px;
  background: var(--color-surface-subtle);
  border-radius: var(--radius-full);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px;
  transition: var(--transition);
  border: 1px solid var(--color-border);
}

.theme-toggle:hover .toggle-track {
  background: var(--color-surface-elevated);
  box-shadow: var(--shadow-md);
}

.toggle-thumb {
  width: 24px;
  height: 24px;
  background: var(--color-primary);
  border-radius: 50%;
  position: absolute;
  left: 4px;
  transition: var(--transition-bounce);
  box-shadow: var(--shadow-sm);
  z-index: 2;
  border: 2px solid var(--color-surface);
}

.theme-toggle.active .toggle-thumb {
  transform: translateX(28px);
  background: var(--color-accent);
}

.toggle-icons {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0 8px;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.875rem;
}

.icon-light {
  color: var(--color-warning);
  transition: var(--transition);
  opacity: 0.6;
}

.icon-dark {
  color: var(--color-primary);
  transition: var(--transition);
  opacity: 0.6;
}

.theme-toggle.active .icon-dark {
  opacity: 1;
  color: var(--color-accent);
}

.theme-toggle:not(.active) .icon-light {
  opacity: 1;
  color: var(--color-warning);
}

/* Navigation */
.nav {
  display: flex;
  gap: 0.5rem;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  border-radius: var(--radius-full);
  text-decoration: none;
  color: var(--color-text-secondary);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  transition: var(--transition);
  font-size: 0.875rem;
  font-weight: 500;
  font-family: var(--font-mono);
  text-transform: lowercase;
}

.nav-item:hover {
  background: var(--color-surface-elevated);
  border-color: var(--color-border);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.nav-item--danger:hover {
  background: var(--color-accent);
  color: var(--color-secondary);
  border-color: var(--color-accent);
}

.nav-icon {
  font-size: 0.875rem;
  opacity: 0.8;
}

@media (max-width: 768px) {
  .nav-label {
    display: none;
  }
  
  .nav-item {
    padding: 0.75rem;
    border-radius: var(--radius-lg);
  }
  
  .header-controls {
    gap: 0.5rem;
  }
}

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

/* Alerts */
.alerts {
  margin-bottom: 2rem;
}

.alert {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.5rem;
  background: rgba(255, 59, 48, 0.1);
  border: 1px solid rgba(255, 59, 48, 0.2);
  border-radius: var(--radius-xl);
  margin-bottom: 0.5rem;
  animation: slideIn 0.4s ease-out;
  backdrop-filter: blur(10px);
}

.alert-icon {
  color: var(--color-accent);
  font-size: 1rem;
}

.alert-message {
  color: var(--color-accent-dark);
  font-weight: 500;
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

/* Widgets & Panels */
.widget {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.widget::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border), transparent);
  opacity: 0;
  transition: var(--transition);
}

.widget:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  border-color: var(--color-border);
}

.widget:hover::before {
  opacity: 1;
}

.widget-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.widget-icon {
  width: 44px;
  height: 44px;
  background: var(--color-surface-elevated);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  border: 1px solid var(--color-border);
}

.widget-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
  font-family: var(--font-mono);
  text-transform: lowercase;
}

/* Login Container */
.login-container {
  max-width: 420px;
  margin: 0 auto;
  padding: 0 1rem;
}

.login-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: 2.5rem;
  box-shadow: var(--shadow-xl);
  animation: fadeInUp 0.6s ease-out;
  position: relative;
  overflow: hidden;
}

.login-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), transparent, var(--color-accent));
  animation: shimmer 3s ease-in-out infinite;
}

/* Forms */
form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

input[type="text"],
input[type="password"],
input[type="file"] {
  width: 100%;
  padding: 1rem 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  font-size: 1rem;
  font-family: var(--font-primary);
  transition: var(--transition);
  outline: none;
  color: var(--color-text-primary);
}

input[type="text"]:focus,
input[type="password"]:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.1);
  transform: translateY(-1px);
}

[data-theme="dark"] input[type="text"]:focus,
[data-theme="dark"] input[type="password"]:focus {
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.1);
}

input[type="file"] {
  padding: 1.5rem;
  background: var(--color-surface-subtle);
  border: 2px dashed var(--color-border);
  cursor: pointer;
  text-align: center;
  position: relative;
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

input[type="file"]:hover {
  border-color: var(--color-primary);
  background: var(--color-surface-elevated);
}

/* Buttons */
button {
  background: var(--color-primary);
  color: var(--color-secondary);
  border: none;
  padding: 1rem 1.5rem;
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-bounce);
  font-family: var(--font-mono);
  text-transform: lowercase;
  position: relative;
  overflow: hidden;
}

button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: var(--transition-slow);
}

button:hover::before {
  left: 100%;
}

button:hover {
  background: var(--color-primary-soft);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

button:active {
  transform: translateY(0);
}

.button-danger {
  background: var(--color-accent);
}

.button-danger:hover {
  background: var(--color-accent-dark);
}

.button-secondary {
  background: var(--color-surface-elevated);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.button-secondary:hover {
  background: var(--color-surface-subtle);
}

/* Lists */
ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  background: var(--color-surface-subtle);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  transition: var(--transition);
  position: relative;
}

li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--color-accent);
  border-radius: var(--radius-sm);
  opacity: 0;
  transition: var(--transition);
}

li:hover {
  background: var(--color-surface);
  border-color: var(--color-border);
  transform: translateX(6px);
}

li:hover::before {
  opacity: 1;
}

/* File and User Items */
.file-item,
.user-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex: 1;
}

.file-icon,
.user-icon {
  font-size: 1.5rem;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface-elevated);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.user-icon {
  background: var(--color-primary);
  color: var(--color-secondary);
}

.file-name,
.user-name {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--color-text-primary);
  font-size: 0.875rem;
  flex: 1;
}

.item-actions {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

li a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-md);
  transition: var(--transition);
  border: 1px solid transparent;
  font-family: var(--font-mono);
  text-transform: lowercase;
}

li a:hover {
  background: var(--color-surface-elevated);
  border-color: var(--color-border);
  color: var(--color-text-primary);
}

li a[href*="delete"]:hover {
  background: var(--color-accent);
  color: var(--color-secondary);
  border-color: var(--color-accent);
}

li a[href*="download"]:hover {
  background: var(--color-success);
  color: var(--color-secondary);
  border-color: var(--color-success);
}

/* Modal System */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.3s ease-out;
}

.modal {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: 0;
  min-width: 400px;
  max-width: 90vw;
  box-shadow: var(--shadow-xl);
  animation: scaleIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
  overflow: hidden;
}

.modal::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
}

.modal-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 2rem 2rem 1rem;
}

.modal-icon {
  width: 48px;
  height: 48px;
  background: rgba(255, 59, 48, 0.1);
  color: var(--color-accent);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  border: 1px solid rgba(255, 59, 48, 0.2);
}

.modal-title {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-primary);
  text-transform: lowercase;
  margin: 0;
}

.modal-body {
  padding: 0 2rem 1.5rem;
}

.modal-message {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
  margin: 0;
}

.modal-actions {
  padding: 1.5rem 2rem 2rem;
  display: flex;
  gap: 1rem;
  justify-content: flex-end;
}

.modal-actions button {
  padding: 0.75rem 1.5rem;
  min-width: 80px;
}

@media (max-width: 768px) {
  .modal {
    min-width: 300px;
    margin: 1rem;
  }
  
  .modal-header,
  .modal-body,
  .modal-actions {
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }
  
  .modal-actions {
    flex-direction: column;
  }
  
  .modal-actions button {
    width: 100%;
  }
}

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

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9) translateY(-10px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

/* Footer */
.footer {
  background: var(--color-primary);
  color: var(--color-secondary);
  padding: 2rem 0;
  margin-top: auto;
  position: relative;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  animation: shimmer 4s ease-in-out infinite;
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.footer-grid {
  display: flex;
  gap: 0.5rem;
}

.footer-dot {
  width: 8px;
  height: 8px;
  background: var(--color-text-tertiary);
  border-radius: 50%;
  animation: pulse-dot 2s infinite;
}

.footer-dot:nth-child(2) {
  animation-delay: 0.4s;
}

.footer-dot:nth-child(3) {
  animation-delay: 0.8s;
}

.footer-text {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  text-transform: lowercase;
  letter-spacing: 0.05em;
}

.footer-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.status-indicator {
  width: 8px;
  height: 8px;
  background: var(--color-success);
  border-radius: 50%;
  animation: pulse-status 1.5s infinite;
  box-shadow: 0 0 8px var(--color-success);
}

.status-text {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  text-transform: lowercase;
}

@media (max-width: 768px) {
  .footer-content {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse-dot {
  0%, 100% {
    opacity: 0.3;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.2);
  }
}

@keyframes pulse-status {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.7;
    transform: scale(1.1);
  }
}

@keyframes pulse-accent {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.6;
  }
}

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

/* Grid System */
.grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Utilities */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-center {
  text-align: center;
}

.mb-4 {
  margin-bottom: 1rem;
}

.mb-8 {
  margin-bottom: 2rem;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-surface);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-tertiary);
}

/* Selection */
::selection {
  background: var(--color-accent);
  color: var(--color-secondary);
}

/* Focus styles for accessibility */
.theme-toggle:focus-visible,
button:focus-visible,
input:focus-visible,
a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2