:root {
  /* Colors */
  --color-background: rgba(252, 252, 249, 1);
  --color-surface: rgba(255, 255, 253, 1);
  --color-text: rgba(19, 52, 59, 1);
  --color-text-secondary: rgba(98, 108, 113, 1);
  --color-primary: rgba(33, 128, 141, 1);
  --color-primary-hover: rgba(29, 116, 128, 1);
  --color-primary-active: rgba(26, 104, 115, 1);
  --color-secondary: rgba(94, 82, 64, 0.12);
  --color-secondary-hover: rgba(94, 82, 64, 0.2);
  --color-secondary-active: rgba(94, 82, 64, 0.25);
  --color-border: rgba(94, 82, 64, 0.2);
  --color-btn-primary-text: rgba(252, 252, 249, 1);
  --color-card-border: rgba(94, 82, 64, 0.12);
  --color-card-border-inner: rgba(94, 82, 64, 0.12);
  --color-error: rgba(192, 21, 47, 1);
  --color-success: rgba(33, 128, 141, 1);
  --color-warning: rgba(168, 75, 47, 1);
  --color-info: rgba(98, 108, 113, 1);
  --color-focus-ring: rgba(33, 128, 141, 0.4);
  --color-select-caret: rgba(19, 52, 59, 0.8);

  /* Common style patterns */
  --focus-ring: 0 0 0 3px var(--color-focus-ring);
  --focus-outline: 2px solid var(--color-primary);
  --status-bg-opacity: 0.15;
  --status-border-opacity: 0.25;
  --select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23134252' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  --select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");

  /* RGB versions for opacity control */
  --color-success-rgb: 33, 128, 141;
  --color-error-rgb: 192, 21, 47;
  --color-warning-rgb: 168, 75, 47;
  --color-info-rgb: 98, 108, 113;

  /* Typography */
  --font-family-base: "FKGroteskNeue", "Geist", "Inter", -apple-system,
    BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-family-mono: "Berkeley Mono", ui-monospace, SFMono-Regular, Menlo,
    Monaco, Consolas, monospace;
  --font-size-xs: 11px;
  --font-size-sm: 12px;
  --font-size-base: 14px;
  --font-size-md: 14px;
  --font-size-lg: 16px;
  --font-size-xl: 18px;
  --font-size-2xl: 20px;
  --font-size-3xl: 24px;
  --font-size-4xl: 30px;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 550;
  --font-weight-bold: 600;
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --letter-spacing-tight: -0.01em;

  /* Spacing */
  --space-0: 0;
  --space-1: 1px;
  --space-2: 2px;
  --space-4: 4px;
  --space-6: 6px;
  --space-8: 8px;
  --space-10: 10px;
  --space-12: 12px;
  --space-16: 16px;
  --space-20: 20px;
  --space-24: 24px;
  --space-32: 32px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-base: 8px;
  --radius-md: 10px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.04),
    0 2px 4px -1px rgba(0, 0, 0, 0.02);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.04),
    0 4px 6px -2px rgba(0, 0, 0, 0.02);
  --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.15),
    inset 0 -1px 0 rgba(0, 0, 0, 0.03);

  /* Animation */
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --ease-standard: cubic-bezier(0.16, 1, 0.3, 1);

  /* Layout */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
}

/* Dark mode colors */
@media (prefers-color-scheme: dark) {
  :root {
    --color-background: rgba(31, 33, 33, 1);
    --color-surface: rgba(38, 40, 40, 1);
    --color-text: rgba(245, 245, 245, 1);
    --color-text-secondary: rgba(167, 169, 169, 0.7);
    --color-primary: rgba(50, 184, 198, 1);
    --color-primary-hover: rgba(45, 166, 178, 1);
    --color-primary-active: rgba(41, 150, 161, 1);
    --color-secondary: rgba(119, 124, 124, 0.15);
    --color-secondary-hover: rgba(119, 124, 124, 0.25);
    --color-secondary-active: rgba(119, 124, 124, 0.3);
    --color-border: rgba(119, 124, 124, 0.3);
    --color-error: rgba(255, 84, 89, 1);
    --color-success: rgba(50, 184, 198, 1);
    --color-warning: rgba(230, 129, 97, 1);
    --color-info: rgba(167, 169, 169, 1);
    --color-focus-ring: rgba(50, 184, 198, 0.4);
    --color-btn-primary-text: rgba(19, 52, 59, 1);
    --color-card-border: rgba(119, 124, 124, 0.2);
    --color-card-border-inner: rgba(119, 124, 124, 0.15);
    --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.1),
      inset 0 -1px 0 rgba(0, 0, 0, 0.15);
    --button-border-secondary: rgba(119, 124, 124, 0.2);
    --color-border-secondary: rgba(119, 124, 124, 0.2);
    --color-select-caret: rgba(245, 245, 245, 0.8);

    /* Common style patterns - updated for dark mode */
    --focus-ring: 0 0 0 3px var(--color-focus-ring);
    --focus-outline: 2px solid var(--color-primary);
    --status-bg-opacity: 0.15;
    --status-border-opacity: 0.25;
    --select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23134252' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    --select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");

    /* RGB versions for dark mode */
    --color-success-rgb: 50, 184, 198;
    --color-error-rgb: 255, 84, 89;
    --color-warning-rgb: 230, 129, 97;
    --color-info-rgb: 167, 169, 169;
  }
}

/* Data attribute for manual theme switching */
[data-color-scheme="dark"] {
  --color-background: rgba(31, 33, 33, 1);
  --color-surface: rgba(38, 40, 40, 1);
  --color-text: rgba(245, 245, 245, 1);
  --color-text-secondary: rgba(167, 169, 169, 0.7);
  --color-primary: rgba(50, 184, 198, 1);
  --color-primary-hover: rgba(45, 166, 178, 1);
  --color-primary-active: rgba(41, 150, 161, 1);
  --color-secondary: rgba(119, 124, 124, 0.15);
  --color-secondary-hover: rgba(119, 124, 124, 0.25);
  --color-secondary-active: rgba(119, 124, 124, 0.3);
  --color-border: rgba(119, 124, 124, 0.3);
  --color-error: rgba(255, 84, 89, 1);
  --color-success: rgba(50, 184, 198, 1);
  --color-warning: rgba(230, 129, 97, 1);
  --color-info: rgba(167, 169, 169, 1);
  --color-focus-ring: rgba(50, 184, 198, 0.4);
  --color-btn-primary-text: rgba(19, 52, 59, 1);
  --color-card-border: rgba(119, 124, 124, 0.15);
  --color-card-border-inner: rgba(119, 124, 124, 0.15);
  --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.1),
    inset 0 -1px 0 rgba(0, 0, 0, 0.15);
  --color-border-secondary: rgba(119, 124, 124, 0.2);
  --color-select-caret: rgba(245, 245, 245, 0.8);

  /* Common style patterns - updated for dark mode */
  --focus-ring: 0 0 0 3px var(--color-focus-ring);
  --focus-outline: 2px solid var(--color-primary);
  --status-bg-opacity: 0.15;
  --status-border-opacity: 0.25;
  --select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23134252' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  --select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");

  /* RGB versions for dark mode */
  --color-success-rgb: 50, 184, 198;
  --color-error-rgb: 255, 84, 89;
  --color-warning-rgb: 230, 129, 97;
  --color-info-rgb: 167, 169, 169;
}

[data-color-scheme="light"] {
  --color-background: rgba(252, 252, 249, 1);
  --color-surface: rgba(255, 255, 253, 1);
  --color-text: rgba(19, 52, 59, 1);
  --color-text-secondary: rgba(98, 108, 113, 1);
  --color-primary: rgba(33, 128, 141, 1);
  --color-primary-hover: rgba(29, 116, 128, 1);
  --color-primary-active: rgba(26, 104, 115, 1);
  --color-secondary: rgba(94, 82, 64, 0.12);
  --color-secondary-hover: rgba(94, 82, 64, 0.2);
  --color-secondary-active: rgba(94, 82, 64, 0.25);
  --color-border: rgba(94, 82, 64, 0.2);
  --color-btn-primary-text: rgba(252, 252, 249, 1);
  --color-card-border: rgba(94, 82, 64, 0.12);
  --color-card-border-inner: rgba(94, 82, 64, 0.12);
  --color-error: rgba(192, 21, 47, 1);
  --color-success: rgba(33, 128, 141, 1);
  --color-warning: rgba(168, 75, 47, 1);
  --color-info: rgba(98, 108, 113, 1);
  --color-focus-ring: rgba(33, 128, 141, 0.4);

  /* RGB versions for light mode */
  --color-success-rgb: 33, 128, 141;
  --color-error-rgb: 192, 21, 47;
  --color-warning-rgb: 168, 75, 47;
  --color-info-rgb: 98, 108, 113;
}

/* Base styles */
html {
  font-size: var(--font-size-base);
  font-family: var(--font-family-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
}

*,
*::before,
*::after {
  box-sizing: inherit;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
  letter-spacing: var(--letter-spacing-tight);
}

h1 {
  font-size: var(--font-size-4xl);
}
h2 {
  font-size: var(--font-size-3xl);
}
h3 {
  font-size: var(--font-size-2xl);
}
h4 {
  font-size: var(--font-size-xl);
}
h5 {
  font-size: var(--font-size-lg);
}
h6 {
  font-size: var(--font-size-md);
}

p {
  margin: 0 0 var(--space-16) 0;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-standard);
}

a:hover {
  color: var(--color-primary-hover);
}

code,
pre {
  font-family: var(--font-family-mono);
  font-size: calc(var(--font-size-base) * 0.95);
  background-color: var(--color-secondary);
  border-radius: var(--radius-sm);
}

code {
  padding: var(--space-1) var(--space-4);
}

pre {
  padding: var(--space-16);
  margin: var(--space-16) 0;
  overflow: auto;
  border: 1px solid var(--color-border);
}

pre code {
  background: none;
  padding: 0;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8) var(--space-16);
  border-radius: var(--radius-base);
  font-size: var(--font-size-base);
  font-weight: 500;
  line-height: 1.5;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-standard);
  border: none;
  text-decoration: none;
  position: relative;
}

.btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

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

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

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

.btn--secondary {
  background: var(--color-secondary);
  color: var(--color-text);
}

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

.btn--secondary:active {
  background: var(--color-secondary-active);
}

.btn--outline {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

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

.btn--sm {
  padding: var(--space-4) var(--space-12);
  font-size: var(--font-size-sm);
  border-radius: var(--radius-sm);
}

.btn--lg {
  padding: var(--space-10) var(--space-20);
  font-size: var(--font-size-lg);
  border-radius: var(--radius-md);
}

.btn--full-width {
  width: 100%;
}

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

/* Form elements */
.form-control {
  display: block;
  width: 100%;
  padding: var(--space-8) var(--space-12);
  font-size: var(--font-size-md);
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-base);
  transition: border-color var(--duration-fast) var(--ease-standard),
    box-shadow var(--duration-fast) var(--ease-standard);
}

textarea.form-control {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
}

select.form-control {
  padding: var(--space-8) var(--space-12);
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  background-image: var(--select-caret-light);
  background-repeat: no-repeat;
  background-position: right var(--space-12) center;
  background-size: 16px;
  padding-right: var(--space-32);
}

/* Add a dark mode specific caret */
@media (prefers-color-scheme: dark) {
  select.form-control {
    background-image: var(--select-caret-dark);
  }
}

/* Also handle data-color-scheme */
[data-color-scheme="dark"] select.form-control {
  background-image: var(--select-caret-dark);
}

[data-color-scheme="light"] select.form-control {
  background-image: var(--select-caret-light);
}

.form-control:focus {
  border-color: var(--color-primary);
  outline: var(--focus-outline);
}

.form-label {
  display: block;
  margin-bottom: var(--space-8);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
}

.form-group {
  margin-bottom: var(--space-16);
}

/* Card component */
.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-card-border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--duration-normal) var(--ease-standard);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card__body {
  padding: var(--space-16);
}

.card__header,
.card__footer {
  padding: var(--space-16);
  border-bottom: 1px solid var(--color-card-border-inner);
}

/* Status indicators - simplified with CSS variables */
.status {
  display: inline-flex;
  align-items: center;
  padding: var(--space-6) var(--space-12);
  border-radius: var(--radius-full);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
}

.status--success {
  background-color: rgba(
    var(--color-success-rgb, 33, 128, 141),
    var(--status-bg-opacity)
  );
  color: var(--color-success);
  border: 1px solid
    rgba(var(--color-success-rgb, 33, 128, 141), var(--status-border-opacity));
}

.status--error {
  background-color: rgba(
    var(--color-error-rgb, 192, 21, 47),
    var(--status-bg-opacity)
  );
  color: var(--color-error);
  border: 1px solid
    rgba(var(--color-error-rgb, 192, 21, 47), var(--status-border-opacity));
}

.status--warning {
  background-color: rgba(
    var(--color-warning-rgb, 168, 75, 47),
    var(--status-bg-opacity)
  );
  color: var(--color-warning);
  border: 1px solid
    rgba(var(--color-warning-rgb, 168, 75, 47), var(--status-border-opacity));
}

.status--info {
  background-color: rgba(
    var(--color-info-rgb, 98, 108, 113),
    var(--status-bg-opacity)
  );
  color: var(--color-info);
  border: 1px solid
    rgba(var(--color-info-rgb, 98, 108, 113), var(--status-border-opacity));
}

/* Container layout */
.container {
  width: 100%;
  margin-right: auto;
  margin-left: auto;
  padding-right: var(--space-16);
  padding-left: var(--space-16);
}

@media (min-width: 640px) {
  .container {
    max-width: var(--container-sm);
  }
}
@media (min-width: 768px) {
  .container {
    max-width: var(--container-md);
  }
}
@media (min-width: 1024px) {
  .container {
    max-width: var(--container-lg);
  }
}
@media (min-width: 1280px) {
  .container {
    max-width: var(--container-xl);
  }
}

/* Utility classes */
.flex {
  display: flex;
}
.flex-col {
  flex-direction: column;
}
.items-center {
  align-items: center;
}
.justify-center {
  justify-content: center;
}
.justify-between {
  justify-content: space-between;
}
.gap-4 {
  gap: var(--space-4);
}
.gap-8 {
  gap: var(--space-8);
}
.gap-16 {
  gap: var(--space-16);
}

.m-0 {
  margin: 0;
}
.mt-8 {
  margin-top: var(--space-8);
}
.mb-8 {
  margin-bottom: var(--space-8);
}
.mx-8 {
  margin-left: var(--space-8);
  margin-right: var(--space-8);
}
.my-8 {
  margin-top: var(--space-8);
  margin-bottom: var(--space-8);
}

.p-0 {
  padding: 0;
}
.py-8 {
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
}
.px-8 {
  padding-left: var(--space-8);
  padding-right: var(--space-8);
}
.py-16 {
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
}
.px-16 {
  padding-left: var(--space-16);
  padding-right: var(--space-16);
}

.block {
  display: block;
}
.hidden {
  display: none;
}

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

:focus-visible {
  outline: var(--focus-outline);
  outline-offset: 2px;
}

/* Dark mode specifics */
[data-color-scheme="dark"] .btn--outline {
  border: 1px solid var(--color-border-secondary);
}

@font-face {
  font-family: 'FKGroteskNeue';
  src: url('https://r2cdn.perplexity.ai/fonts/FKGroteskNeue.woff2')
    format('woff2');
}

/* END PERPLEXITY DESIGN SYSTEM */
/* Advanced Google Drive Browser - Comprehensive Styles */

/* CSS Variables for theming and consistency */
:root {
    /* Light theme colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --bg-elevated: #ffffff;
    --bg-overlay: rgba(0, 0, 0, 0.5);
    --bg-glass: rgba(255, 255, 255, 0.9);
    
    /* Text colors */
    --text-primary: #1a1a1a;
    --text-secondary: #6c757d;
    --text-tertiary: #adb5bd;
    --text-inverse: #ffffff;
    --text-link: #0d6efd;
    --text-link-hover: #0a58ca;
    
    /* Border colors */
    --border-light: #e9ecef;
    --border-medium: #dee2e6;
    --border-strong: #adb5bd;
    --border-focus: #0d6efd;
    
    /* Accent colors */
    --accent-primary: #0d6efd;
    --accent-primary-hover: #0b5ed7;
    --accent-primary-active: #0a58ca;
    --accent-success: #198754;
    --accent-warning: #ffc107;
    --accent-danger: #dc3545;
    --accent-info: #0dcaf0;
    
    /* Shadows */
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --shadow-md: 0 0.25rem 0.5rem rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 1rem 2rem rgba(0, 0, 0, 0.2);
    --shadow-focus: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Border radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-full: 9999px;
    
    /* Typography */
    --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    --transition-bounce: 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    /* Layout dimensions */
    --header-height: 60px;
    --status-bar-height: 32px;
    --nav-pane-width: 280px;
    --preview-pane-width: 320px;
    --nav-pane-collapsed-width: 0px;
    --preview-pane-collapsed-width: 0px;
    
    /* Z-index layers */
    --z-base: 1;
    --z-dropdown: 10;
    --z-sticky: 20;
    --z-modal: 30;
    --z-tooltip: 40;
    --z-toast: 50;
}

/* Dark theme overrides */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3a3a3a;
    --bg-elevated: #2d2d2d;
    --bg-overlay: rgba(0, 0, 0, 0.7);
    --bg-glass: rgba(45, 45, 45, 0.9);
    
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-tertiary: #808080;
    --text-inverse: #1a1a1a;
    --text-link: #4dabf7;
    --text-link-hover: #74c0fc;
    
    --border-light: #3a3a3a;
    --border-medium: #4a4a4a;
    --border-strong: #5a5a5a;
    --border-focus: #4dabf7;
    
    --accent-primary: #4dabf7;
    --accent-primary-hover: #74c0fc;
    --accent-primary-active: #339af0;
    --accent-success: #51cf66;
    --accent-warning: #ffd43b;
    --accent-danger: #ff6b6b;
    --accent-info: #22b8cf;
    
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.3);
    --shadow-md: 0 0.25rem 0.5rem rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 0.5rem 1rem rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 1rem 2rem rgba(0, 0, 0, 0.6);
    --shadow-focus: 0 0 0 0.2rem rgba(77, 171, 247, 0.4);
}

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

html {
    font-size: 16px;
    line-height: var(--line-height-normal);
    font-family: var(--font-family-base);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography styles */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
h5 { font-size: var(--font-size-base); }
h6 { font-size: var(--font-size-sm); }

p {
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-relaxed);
}

a {
    color: var(--text-link);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--text-link-hover);
    text-decoration: underline;
}

code, pre {
    font-family: var(--font-family-mono);
    font-size: var(--font-size-sm);
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-sm);
}

code {
    padding: 0.125rem 0.25rem;
}

pre {
    padding: var(--spacing-md);
    overflow-x: auto;
    border: 1px solid var(--border-light);
}

/* Main application layout */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-color: var(--bg-primary);
}

/* Header styles */
.app-header {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    background-color: var(--bg-elevated);
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    height: var(--header-height);
    backdrop-filter: blur(10px);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0 var(--spacing-lg);
    max-width: none;
}

.brand-section {
    display: flex;
    align-items: center;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    color: var(--accent-primary);
    width: 24px;
    height: 24px;
}

.app-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin: 0;
}

/* Toolbar styles */
.toolbar {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.toolbar-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: none;
    border-radius: var(--radius-md);
    background-color: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
}

.toolbar-btn:hover {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.toolbar-btn:active {
    transform: scale(0.95);
}

.toolbar-btn:focus-visible {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
}

.toolbar-btn.active {
    background-color: var(--accent-primary);
    color: var(--text-inverse);
}

.toolbar-btn.active:hover {
    background-color: var(--accent-primary-hover);
}

/* View toggle group */
.view-toggle-group {
    display: flex;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.view-toggle-group .toolbar-btn {
    border-radius: 0;
    border-right: 1px solid var(--border-light);
}

.view-toggle-group .toolbar-btn:last-child {
    border-right: none;
}

/* Theme toggle icons */
.theme-icon-dark {
    display: none;
}

[data-theme="dark"] .theme-icon-light {
    display: none;
}

[data-theme="dark"] .theme-icon-dark {
    display: block;
}

/* Search container */
.search-container {
    position: relative;
    min-width: 300px;
}

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

.search-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    padding-left: 36px;
    padding-right: 36px;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-full);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: var(--shadow-focus);
    background-color: var(--bg-elevated);
}

.search-input::placeholder {
    color: var(--text-tertiary);
}

.search-icon {
    position: absolute;
    left: 12px;
    color: var(--text-tertiary);
    pointer-events: none;
    z-index: 1;
}

.clear-search-btn {
    position: absolute;
    right: 8px;
    width: 20px;
    height: 20px;
    border: none;
    border-radius: var(--radius-full);
    background-color: transparent;
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition-fast);
    z-index: 2;
}

.clear-search-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Dropdown styles */
.dropdown-container {
    position: relative;
}

.toolbar-select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    min-width: 120px;
}

.toolbar-select:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: var(--shadow-focus);
}

.toolbar-select:hover {
    background-color: var(--bg-tertiary);
}

/* Main content area */
.app-main {
    display: grid;
    grid-template-columns: var(--nav-pane-width) 1fr var(--preview-pane-width);
    grid-template-rows: 1fr;
    flex: 1;
    overflow: hidden;
    transition: grid-template-columns var(--transition-normal);
}

.app-main.nav-collapsed {
    grid-template-columns: var(--nav-pane-collapsed-width) 1fr var(--preview-pane-width);
}

.app-main.preview-collapsed {
    grid-template-columns: var(--nav-pane-width) 1fr var(--preview-pane-collapsed-width);
}

.app-main.both-collapsed {
    grid-template-columns: var(--nav-pane-collapsed-width) 1fr var(--preview-pane-collapsed-width);
}

/* Navigation pane */
.nav-pane {
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-light);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.nav-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
    background-color: var(--bg-elevated);
}

.nav-title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin: 0;
}

.nav-collapse-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border: none;
    border-radius: var(--radius-sm);
    background-color: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.nav-collapse-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.nav-content {
    padding: var(--spacing-sm);
    overflow-y: auto;
    height: calc(100vh - var(--header-height) - var(--status-bar-height) - 60px);
}

/* Folder tree */
.folder-tree {
    list-style: none;
}

.folder-tree-item {
    position: relative;
    margin-bottom: var(--spacing-xs);
}

.folder-tree-node {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    user-select: none;
}

.folder-tree-node:hover {
    background-color: var(--bg-tertiary);
}

.folder-tree-node.active {
    background-color: var(--accent-primary);
    color: var(--text-inverse);
}

.folder-tree-node.loading {
    opacity: 0.6;
}

.folder-tree-toggle {
    width: 16px;
    height: 16px;
    margin-right: var(--spacing-xs);
    border: none;
    background: none;
    cursor: pointer;
    color: var(--text-secondary);
    transition: transform var(--transition-fast);
}

.folder-tree-toggle.expanded {
    transform: rotate(90deg);
}

.folder-tree-icon {
    width: 16px;
    height: 16px;
    margin-right: var(--spacing-sm);
    color: var(--text-secondary);
}

.folder-tree-name {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.folder-tree-children {
    margin-left: var(--spacing-lg);
    border-left: 1px solid var(--border-light);
    padding-left: var(--spacing-sm);
}

/* Content pane */
.content-pane {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background-color: var(--bg-primary);
}

/* Breadcrumb navigation */
.breadcrumb-nav {
    padding: var(--spacing-md);
    background-color: var(--bg-elevated);
    border-bottom: 1px solid var(--border-light);
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    list-style: none;
    margin: 0;
    padding: 0;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
    font-size: var(--font-size-sm);
}

.breadcrumb-link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.breadcrumb-link:hover {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.breadcrumb-link.current {
    color: var(--text-primary);
    font-weight: var(--font-weight-medium);
}

.breadcrumb-separator {
    color: var(--text-tertiary);
    margin: 0 var(--spacing-xs);
}

/* Content area */
.content-area {
    flex: 1;
    overflow: hidden;
    position: relative;
}

/* Loading skeleton */
.loading-skeleton {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.skeleton-item {
    height: 48px;
    background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--bg-tertiary) 50%, var(--bg-secondary) 75%);
    background-size: 200% 100%;
    border-radius: var(--radius-md);
    animation: skeleton-loading 1.5s infinite;
}

@keyframes skeleton-loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

/* File list */
.file-list {
    height: 100%;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.file-list.list-view {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.file-list.grid-view {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--spacing-md);
}

/* File item styles */
.file-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
    background-color: var(--bg-elevated);
    position: relative;
    user-select: none;
}

.file-item:hover {
    background-color: var(--bg-secondary);
    border-color: var(--border-light);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.file-item.selected {
    background-color: var(--accent-primary);
    color: var(--text-inverse);
    border-color: var(--accent-primary);
}

.file-item.selected:hover {
    background-color: var(--accent-primary-hover);
}

.file-item.dragging {
    opacity: 0.5;
    transform: rotate(5deg) scale(0.95);
}

.file-item.drag-over {
    border-color: var(--accent-primary);
    background-color: var(--bg-glass);
}

/* Grid view modifications */
.file-list.grid-view .file-item {
    flex-direction: column;
    text-align: center;
    padding: var(--spacing-lg);
    aspect-ratio: 1;
    justify-content: center;
}

.file-list.grid-view .file-icon {
    margin-bottom: var(--spacing-sm);
    width: 48px;
    height: 48px;
}

.file-list.grid-view .file-name {
    font-size: var(--font-size-sm);
    line-height: var(--line-height-tight);
}

.file-list.grid-view .file-details {
    display: none;
}

/* File item content */
.file-icon {
    width: 24px;
    height: 24px;
    margin-right: var(--spacing-sm);
    color: var(--text-secondary);
    flex-shrink: 0;
}

.file-icon.folder {
    color: var(--accent-primary);
}

.file-icon.image {
    color: var(--accent-success);
}

.file-icon.video {
    color: var(--accent-danger);
}

.file-icon.audio {
    color: var(--accent-warning);
}

.file-icon.document {
    color: var(--accent-info);
}

.file-content {
    flex: 1;
    min-width: 0;
}

.file-name {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-details {
    display: flex;
    gap: var(--spacing-md);
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

.file-size, .file-modified {
    white-space: nowrap;
}

.file-actions {
    display: flex;
    gap: var(--spacing-xs);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.file-item:hover .file-actions {
    opacity: 1;
}

.file-action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border: none;
    border-radius: var(--radius-sm);
    background-color: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.file-action-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Empty state */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: var(--spacing-xxl);
    text-align: center;
}

.empty-icon {
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-lg);
}

.empty-title {
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.empty-description {
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* JSON view */
.json-view {
    height: 100%;
    overflow: auto;
    padding: var(--spacing-md);
}

.json-view pre {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
}

.json-view code {
    background: none;
    padding: 0;
    color: var(--text-primary);
}

/* Preview pane */
.preview-pane {
    background-color: var(--bg-secondary);
    border-left: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
    background-color: var(--bg-elevated);
}

.preview-title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin: 0;
}

.preview-close-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border: none;
    border-radius: var(--radius-sm);
    background-color: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.preview-close-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.preview-content {
    flex: 1;
    overflow: hidden;
    position: relative;
}

.preview-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: var(--spacing-xl);
    text-align: center;
}

.placeholder-icon {
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-lg);
}

.preview-placeholder p {
    color: var(--text-secondary);
    margin: 0;
}

.preview-container {
    height: 100%;
    overflow: auto;
    padding: var(--spacing-md);
}

/* Preview content types */
.preview-image {
    width: 100%;
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.preview-video {
    width: 100%;
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
}

.preview-iframe {
    width: 100%;
    height: 100%;
    border: none;
    border-radius: var(--radius-md);
}

.preview-text {
    font-family: var(--font-family-mono);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    white-space: pre-wrap;
    background-color: var(--bg-tertiary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-light);
}

.preview-details {
    background-color: var(--bg-elevated);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.preview-details h3 {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.preview-details-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.preview-details-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid var(--border-light);
    font-size: var(--font-size-sm);
}

.preview-details-item:last-child {
    border-bottom: none;
}

.preview-details-label {
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
}

.preview-details-value {
    color: var(--text-primary);
    text-align: right;
}

.preview-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.preview-action-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    background-color: var(--bg-elevated);
    color: var(--text-primary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.preview-action-btn:hover {
    background-color: var(--bg-secondary);
    border-color: var(--border-medium);
    transform: translateY(-1px);
}

.preview-action-btn.primary {
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
    color: var(--text-inverse);
}

.preview-action-btn.primary:hover {
    background-color: var(--accent-primary-hover);
    border-color: var(--accent-primary-hover);
}

/* Status bar */
.status-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--status-bar-height);
    padding: 0 var(--spacing-lg);
    background-color: var(--bg-elevated);
    border-top: 1px solid var(--border-light);
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

.status-left, .status-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.status-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.status-indicator {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--accent-success);
}

.status-indicator.warning {
    background-color: var(--accent-warning);
}

.status-indicator.error {
    background-color: var(--accent-danger);
}

.item-count, .selected-count {
    font-weight: var(--font-weight-medium);
}

/* Context menu */
.context-menu {
    position: fixed;
    z-index: var(--z-dropdown);
    background-color: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xs);
    min-width: 180px;
    backdrop-filter: blur(10px);
    animation: context-menu-appear 0.2s ease-out;
}

@keyframes context-menu-appear {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(-10px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.context-menu-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-sm);
    background-color: transparent;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.context-menu-item:hover {
    background-color: var(--bg-secondary);
}

.context-menu-item:active {
    transform: scale(0.98);
}

.context-menu-item svg {
    width: 16px;
    height: 16px;
    color: var(--text-secondary);
}

.context-menu-divider {
    height: 1px;
    background-color: var(--border-light);
    border: none;
    margin: var(--spacing-xs) 0;
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: var(--z-modal);
    background-color: var(--bg-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    backdrop-filter: blur(4px);
    animation: modal-overlay-appear 0.3s ease-out;
}

@keyframes modal-overlay-appear {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.modal-content {
    background-color: var(--bg-elevated);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    max-width: 600px;
    width: 100%;
    max-height: 80vh;
    overflow: hidden;
    animation: modal-content-appear 0.3s ease-out;
}

@keyframes modal-content-appear {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

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

.modal-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin: 0;
}

.modal-close-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: none;
    border-radius: var(--radius-full);
    background-color: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-close-btn:hover {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
}

/* About modal specific styles */
.about-content {
    text-align: center;
}

.about-logo {
    margin-bottom: var(--spacing-lg);
}

.about-logo svg {
    color: var(--accent-primary);
}

.about-features, .about-credits {
    margin-top: var(--spacing-lg);
    text-align: left;
}

.about-features h4, .about-credits h4 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.about-features ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.about-features li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: var(--spacing-lg);
}

.about-features li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent-success);
    font-weight: var(--font-weight-bold);
}

/* Shortcuts modal */
.shortcuts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.shortcut-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.shortcut-item kbd {
    display: inline-block;
    padding: 0.1rem 0.4rem;
    font-size: var(--font-size-xs);
    color: var(--text-primary);
    background-color: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    font-family: var(--font-family-mono);
    font-weight: var(--font-weight-medium);
}

.shortcut-item span {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* Snackbar */
.snackbar {
    position: fixed;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    z-index: var(--z-toast);
    background-color: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(10px);
    animation: snackbar-appear 0.3s ease-out;
}

@keyframes snackbar-appear {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

.snackbar-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
}

.snackbar-message {
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    margin-right: auto;
}

.snackbar-action {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: none;
    border-radius: var(--radius-sm);
    background-color: var(--accent-primary);
    color: var(--text-inverse);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.snackbar-action:hover {
    background-color: var(--accent-primary-hover);
}

.snackbar-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border: none;
    border-radius: var(--radius-sm);
    background-color: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.snackbar-close:hover {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

/* Drag and drop */
.drag-ghost {
    position: fixed;
    z-index: var(--z-modal);
    pointer-events: none;
    background-color: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    box-shadow: var(--shadow-lg);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    opacity: 0.9;
    transform: rotate(-2deg);
}

.drag-over-folder {
    background-color: var(--bg-glass);
    border-color: var(--accent-primary);
}

.drag-placeholder {
    height: 2px;
    background-color: var(--accent-primary);
    border-radius: var(--radius-full);
    margin: var(--spacing-xs) 0;
    animation: drag-placeholder-pulse 1s ease-in-out infinite;
}

@keyframes drag-placeholder-pulse {
    0%, 100% {
        opacity: 0.5;
    }
    50% {
        opacity: 1;
    }
}

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

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb {
    background: var(--border-medium);
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-strong);
}

/* Responsive design */
@media (max-width: 1024px) {
    :root {
        --nav-pane-width: 240px;
        --preview-pane-width: 280px;
    }
    
    .header-content {
        padding: 0 var(--spacing-md);
    }
    
    .toolbar {
        gap: var(--spacing-xs);
    }
    
    .search-container {
        min-width: 200px;
    }
}

@media (max-width: 768px) {
    :root {
        --nav-pane-width: 0px;
        --preview-pane-width: 0px;
    }
    
    .app-main {
        grid-template-columns: 1fr;
    }
    
    .nav-pane, .preview-pane {
        display: none;
    }
    
    .toolbar {
        flex-wrap: wrap;
        gap: var(--spacing-xs);
    }
    
    .search-container {
        min-width: 150px;
        order: -1;
        flex-basis: 100%;
    }
    
    .file-list.grid-view {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
}

@media (max-width: 480px) {
    .header-content {
        padding: 0 var(--spacing-sm);
    }
    
    .app-title {
        font-size: var(--font-size-base);
    }
    
    .toolbar-btn {
        width: 32px;
        height: 32px;
    }
    
    .file-list {
        padding: var(--spacing-sm);
    }
    
    .file-list.grid-view {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
        gap: var(--spacing-sm);
    }
    
    .modal-content {
        margin: var(--spacing-sm);
        max-height: calc(100vh - var(--spacing-lg));
    }
    
    .shortcuts-grid {
        grid-template-columns: 1fr;
    }
}

/* Print styles */
@media print {
    .app-header, .status-bar, .nav-pane, .preview-pane {
        display: none !important;
    }
    
    .app-main {
        grid-template-columns: 1fr !important;
    }
    
    .file-list {
        padding: 0 !important;
    }
    
    .file-item {
        break-inside: avoid;
        border: 1px solid var(--border-light) !important;
        margin-bottom: var(--spacing-sm) !important;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --border-light: #000000;
        --border-medium: #000000;
        --border-strong: #000000;
        --shadow-sm: none;
        --shadow-md: none;
        --shadow-lg: none;
        --shadow-xl: none;
    }
    
    .file-item:hover {
        transform: none;
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .file-item:hover {
        transform: none;
    }
}

/* Focus visible styles for better accessibility */
*:focus-visible {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
}

/* Selection styles */
::selection {
    background-color: var(--accent-primary);
    color: var(--text-inverse);
}

/* Utility classes */
.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;
}

.visually-hidden {
    position: absolute !important;
    height: 1px;
    width: 1px;
    overflow: hidden;
    clip: rect(1px, 1px, 1px, 1px);
    white-space: nowrap;
}

/* Loading states */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--border-light);
    border-top: 2px solid var(--accent-primary);
    border-radius: 50%;
    animation: spinner 1s linear infinite;
}

@keyframes spinner {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Error states */
.error {
    color: var(--accent-danger);
    background-color: rgba(220, 53, 69, 0.1);
    border: 1px solid rgba(220, 53, 69, 0.2);
}

.success {
    color: var(--accent-success);
    background-color: rgba(25, 135, 84, 0.1);
    border: 1px solid rgba(25, 135, 84, 0.2);
}

/* Animation classes */
.fade-in {
    animation: fadeIn 0.3s ease-out;
}

.fade-out {
    animation: fadeOut 0.3s ease-out;
}

.slide-in-left {
    animation: slideInLeft 0.3s ease-out;
}

.slide-in-right {
    animation: slideInRight 0.3s ease-out;
}

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

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

@keyframes slideInLeft {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

@keyframes slideInRight {
    from { transform: translateX(100%); }
    to { transform: translateX(0); }
}

/* Custom checkbox and radio styles */
.custom-checkbox,
.custom-radio {
    position: relative;
    display: inline-block;
    width: 18px;
    height: 18px;
    margin-right: var(--spacing-sm);
}

.custom-checkbox input,
.custom-radio input {
    opacity: 0;
    position: absolute;
    width: 100%;
    height: 100%;
    margin: 0;
    cursor: pointer;
}

.custom-checkbox::before,
.custom-radio::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 1px solid var(--border-medium);
    background-color: var(--bg-elevated);
    transition: all var(--transition-fast);
}

.custom-checkbox::before {
    border-radius: var(--radius-sm);
}

.custom-radio::before {
    border-radius: 50%;
}

.custom-checkbox input:checked + .custom-checkbox::before,
.custom-radio input:checked + .custom-radio::before {
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.custom-checkbox input:checked + .custom-checkbox::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--text-inverse);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
}

.custom-radio input:checked + .custom-radio::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--text-inverse);
}

/* Tooltip styles */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    margin-bottom: 5px;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    color: var(--text-primary);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-fast);
    z-index: var(--z-tooltip);
}

.tooltip:hover::after {
    opacity: 1;
}

/* Badge styles */
.badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.badge-primary {
    background-color: var(--accent-primary);
    color: var(--text-inverse);
}

.badge-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.badge-success {
    background-color: var(--accent-success);
    color: var(--text-inverse);
}

.badge-warning {
    background-color: var(--accent-warning);
    color: var(--text-inverse);
}

.badge-danger {
    background-color: var(--accent-danger);
    color: var(--text-inverse);
}

/* Progress bar */
.progress {
    width: 100%;
    height: 8px;
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background-color: var(--accent-primary);
    transition: width var(--transition-normal);
}

.progress-bar.animated {
    background-image: linear-gradient(
        45deg,
        rgba(255, 255, 255, 0.15) 25%,
        transparent 25%,
        transparent 50%,
        rgba(255, 255, 255, 0.15) 50%,
        rgba(255, 255, 255, 0.15) 75%,
        transparent 75%,
        transparent
    );
    background-size: 20px 20px;
    animation: progress-bar-stripes 1s linear infinite;
}

@keyframes progress-bar-stripes {
    0% { background-position: 0 0; }
    100% { background-position: 20px 0; }
}

/* End of comprehensive styles */