: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://www.perplexity.ai/fonts/FKGroteskNeue.woff2')
    format('woff2');
}

/* Application-specific styles */
.app-container {
  display: flex;
  min-height: 100vh;
  background-color: var(--color-background);
}

/* Sidebar Navigation */
.sidebar {
  width: 300px;
  background-color: var(--color-surface);
  border-right: 1px solid var(--color-border);
  padding: var(--space-24);
  position: fixed;
  height: 100vh;
  overflow-y: auto;
  z-index: 100;
  transition: transform var(--duration-normal) var(--ease-standard);
}

.sidebar-header {
  margin-bottom: var(--space-32);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sidebar-header h2 {
  font-size: var(--font-size-lg);
  color: var(--color-primary);
  margin: 0;
}

.theme-toggle {
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: var(--font-size-lg);
  transition: all var(--duration-fast) var(--ease-standard);
}

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

.progress-overview {
  margin-bottom: var(--space-32);
  padding: var(--space-16);
  background-color: var(--color-secondary);
  border-radius: var(--radius-base);
}

.progress-overview h3 {
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-12);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.progress-bar {
  background-color: var(--color-border);
  border-radius: var(--radius-full);
  height: 8px;
  overflow: hidden;
  margin-bottom: var(--space-8);
}

.progress-fill {
  background-color: var(--color-primary);
  height: 100%;
  border-radius: var(--radius-full);
  transition: width var(--duration-normal) var(--ease-standard);
  width: 0%;
}

.progress-bar.small {
  height: 4px;
}

.progress-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.nav-menu {
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-menu li {
  margin-bottom: var(--space-8);
}

.nav-link {
  display: flex;
  align-items: center;
  padding: var(--space-12) var(--space-16);
  border-radius: var(--radius-base);
  color: var(--color-text);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: all var(--duration-fast) var(--ease-standard);
  gap: var(--space-12);
}

.nav-link:hover {
  background-color: var(--color-secondary-hover);
  color: var(--color-primary);
}

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

/* Main Content */
.main-content {
  flex: 1;
  margin-left: 300px;
  padding: var(--space-32);
  min-height: 100vh;
  transition: margin-left var(--duration-normal) var(--ease-standard);
}

.sidebar-toggle {
  display: none;
  background: var(--color-primary);
  color: var(--color-btn-primary-text);
  border: none;
  border-radius: var(--radius-base);
  padding: var(--space-8) var(--space-12);
  margin-bottom: var(--space-24);
  cursor: pointer;
  font-size: var(--font-size-lg);
}

.content-section {
  display: none;
}

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

/* Hero Section */
.hero {
  text-align: center;
  margin-bottom: var(--space-32);
  padding: var(--space-32) 0;
}

.hero h1 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--space-16);
  background: linear-gradient(135deg, var(--color-primary), var(--color-text));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: var(--line-height-normal);
}

/* Module Overview */
.modules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-24);
}

.module-card {
  background: var(--color-surface);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  padding: var(--space-24);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-standard);
  position: relative;
  overflow: hidden;
}

.module-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.module-icon {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--space-16);
  display: block;
}

.module-card h3 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-12);
  color: var(--color-text);
}

.module-card p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-20);
  line-height: var(--line-height-normal);
}

.module-progress {
  margin-top: var(--space-16);
}

/* Module Header */
.module-header {
  margin-bottom: var(--space-32);
  text-align: center;
}

.module-header h1 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-12);
}

.module-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
}

/* Tabs */
.content-tabs {
  display: flex;
  gap: var(--space-4);
  margin-bottom: var(--space-32);
  border-bottom: 1px solid var(--color-border);
  overflow-x: auto;
}

.tab-btn {
  padding: var(--space-12) var(--space-20);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--duration-fast) var(--ease-standard);
}

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

.tab-btn.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.tab-content {
  min-height: 400px;
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
}

/* Properties Grid */
.properties-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-20);
  margin: var(--space-24) 0;
}

.property-card {
  background: var(--color-secondary);
  padding: var(--space-20);
  border-radius: var(--radius-base);
  border-left: 4px solid var(--color-primary);
}

.property-card h4 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-8);
  color: var(--color-primary);
}

.property-card p {
  margin: 0;
  color: var(--color-text-secondary);
  line-height: var(--line-height-normal);
}

/* Formula Section */
.formula-section {
  margin: var(--space-24) 0;
  padding: var(--space-20);
  background: var(--color-secondary);
  border-radius: var(--radius-base);
}

.formula {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-lg);
  background: var(--color-surface);
  padding: var(--space-12) var(--space-16);
  border-radius: var(--radius-sm);
  margin: var(--space-8) 0;
  border-left: 4px solid var(--color-primary);
  text-align: center;
  font-weight: var(--font-weight-medium);
}

/* Algorithm Steps */
.algorithm-steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-20);
}

.step-item {
  display: flex;
  gap: var(--space-16);
  align-items: flex-start;
}

.step-number {
  background: var(--color-primary);
  color: var(--color-btn-primary-text);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  flex-shrink: 0;
}

.step-content h4 {
  margin-bottom: var(--space-8);
  color: var(--color-text);
}

.step-content p {
  margin: 0;
  color: var(--color-text-secondary);
  line-height: var(--line-height-normal);
}

/* Examples */
.example-steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-16);
}

.example-step {
  background: var(--color-secondary);
  padding: var(--space-16);
  border-radius: var(--radius-base);
  border-left: 4px solid var(--color-primary);
}

.example-step h4 {
  margin-bottom: var(--space-8);
  color: var(--color-primary);
}

.calculation {
  font-family: var(--font-family-mono);
  background: var(--color-surface);
  padding: var(--space-12);
  border-radius: var(--radius-sm);
  margin-top: var(--space-8);
}

.calculation span {
  display: block;
  margin: var(--space-4) 0;
}

/* Interactive Calculator */
.calculator-interface {
  max-width: 600px;
}

.calculation-steps {
  margin-top: var(--space-24);
  padding: var(--space-20);
  background: var(--color-secondary);
  border-radius: var(--radius-base);
}

.calculation-steps h3 {
  margin-bottom: var(--space-16);
  color: var(--color-primary);
}

/* Questions */
.question-set {
  display: flex;
  flex-direction: column;
  gap: var(--space-32);
}

.question-item {
  background: var(--color-secondary);
  padding: var(--space-24);
  border-radius: var(--radius-base);
  border-left: 4px solid var(--color-primary);
}

.question-item h4 {
  margin-bottom: var(--space-12);
  color: var(--color-primary);
}

.question-item p {
  margin-bottom: var(--space-16);
  font-weight: var(--font-weight-medium);
}

.options {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  margin: var(--space-16) 0;
}

.options label {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  padding: var(--space-8);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease-standard);
}

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

.options input[type="radio"] {
  margin: 0;
}

.answer-feedback {
  margin-top: var(--space-16);
  padding: var(--space-16);
  background: var(--color-surface);
  border-radius: var(--radius-base);
  border-left: 4px solid var(--color-success);
}

.answer-feedback.incorrect {
  border-left-color: var(--color-error);
  background: rgba(var(--color-error-rgb), 0.1);
}

.answer-feedback.correct {
  border-left-color: var(--color-success);
  background: rgba(var(--color-success-rgb), 0.1);
}

/* Mode Cards */
.modes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--space-24);
}

.mode-card {
  background: var(--color-surface);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  padding: var(--space-24);
  transition: all var(--duration-normal) var(--ease-standard);
}

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

.mode-card h3 {
  color: var(--color-primary);
  margin-bottom: var(--space-12);
}

.mode-details {
  margin-top: var(--space-16);
}

.mode-details h4 {
  font-size: var(--font-size-md);
  margin: var(--space-16) 0 var(--space-8) 0;
  color: var(--color-text);
}

.mode-details ul, .mode-details ol {
  margin: 0;
  padding-left: var(--space-20);
}

.mode-details li {
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
}

.security-level {
  margin-top: var(--space-16);
  font-weight: var(--font-weight-medium);
}

/* Comparison Table */
.comparison-table {
  overflow-x: auto;
  margin: var(--space-24) 0;
}

.comparison-table table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-surface);
  border-radius: var(--radius-base);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.comparison-table th,
.comparison-table td {
  padding: var(--space-12) var(--space-16);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.comparison-table th {
  background: var(--color-secondary);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

.comparison-table td {
  color: var(--color-text-secondary);
}

.comparison-table tbody tr:hover {
  background: var(--color-secondary);
}

/* Simulator */
.simulator-interface {
  max-width: 800px;
}

.params-section {
  margin: var(--space-24) 0;
  padding: var(--space-20);
  background: var(--color-secondary);
  border-radius: var(--radius-base);
}

.params-section h3 {
  margin-bottom: var(--space-16);
  color: var(--color-primary);
}

.simulation-output {
  margin-top: var(--space-24);
  padding: var(--space-20);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-base);
}

/* RSA Specific */
.operations-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-24);
  margin: var(--space-24) 0;
}

.operation-card {
  background: var(--color-secondary);
  padding: var(--space-20);
  border-radius: var(--radius-base);
  border-left: 4px solid var(--color-primary);
}

.operation-card h3 {
  color: var(--color-primary);
  margin-bottom: var(--space-12);
}

.operation-card ol {
  margin: var(--space-12) 0 0 0;
  padding-left: var(--space-20);
}

.properties-list {
  margin: var(--space-24) 0;
}

.property {
  background: var(--color-secondary);
  padding: var(--space-16);
  border-radius: var(--radius-base);
  margin-bottom: var(--space-12);
  border-left: 4px solid var(--color-primary);
}

.example-walkthrough {
  display: flex;
  flex-direction: column;
  gap: var(--space-20);
}

.result-box {
  background: var(--color-success);
  color: var(--color-surface);
  padding: var(--space-20);
  border-radius: var(--radius-base);
  margin-top: var(--space-20);
}

.result-box h4 {
  color: var(--color-surface);
  margin-bottom: var(--space-12);
}

.calc-section {
  margin-bottom: var(--space-24);
  padding: var(--space-20);
  background: var(--color-secondary);
  border-radius: var(--radius-base);
}

.calc-section h3 {
  margin-bottom: var(--space-16);
  color: var(--color-primary);
}

.keys-display {
  background: var(--color-surface);
  padding: var(--space-16);
  border-radius: var(--radius-base);
  border: 1px solid var(--color-border);
  margin: var(--space-16) 0;
}

.key-item {
  margin: var(--space-8) 0;
  font-family: var(--font-family-mono);
  padding: var(--space-8);
  background: var(--color-secondary);
  border-radius: var(--radius-sm);
}

/* Random Number Generation */
.parameters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-16);
  margin: var(--space-20) 0;
}

.param-item {
  background: var(--color-secondary);
  padding: var(--space-12);
  border-radius: var(--radius-base);
  text-align: center;
  font-family: var(--font-family-mono);
}

.example-sequence {
  background: var(--color-surface);
  padding: var(--space-20);
  border-radius: var(--radius-base);
  border: 1px solid var(--color-border);
  margin: var(--space-20) 0;
}

.sequence-step {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-8) 0;
  border-bottom: 1px solid var(--color-border);
  font-family: var(--font-family-mono);
}

.sequence-step:last-child {
  border-bottom: none;
}

.sequence-step span {
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
}

.guidelines {
  background: var(--color-secondary);
  padding: var(--space-20);
  border-radius: var(--radius-base);
  margin: var(--space-20) 0;
}

.guidelines ul {
  margin: 0;
  padding-left: var(--space-20);
}

.guidelines li {
  margin-bottom: var(--space-8);
  color: var(--color-text-secondary);
}

.requirements {
  background: var(--color-secondary);
  padding: var(--space-20);
  border-radius: var(--radius-base);
  margin: var(--space-20) 0;
  text-align: center;
}

.security-properties {
  background: var(--color-secondary);
  padding: var(--space-20);
  border-radius: var(--radius-base);
  margin: var(--space-20) 0;
}

.security-properties ul {
  margin: 0;
  padding-left: var(--space-20);
}

.security-properties li {
  margin-bottom: var(--space-12);
  color: var(--color-text-secondary);
}

.generation-results {
  background: var(--color-surface);
  padding: var(--space-20);
  border-radius: var(--radius-base);
  border: 1px solid var(--color-border);
  margin: var(--space-20) 0;
}

#sequenceDisplay {
  font-family: var(--font-family-mono);
  background: var(--color-secondary);
  padding: var(--space-16);
  border-radius: var(--radius-base);
  margin-top: var(--space-16);
}

/* OS Security */
.protection-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-20);
  margin: var(--space-24) 0;
}

.protection-card {
  background: var(--color-surface);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  padding: var(--space-20);
  transition: all var(--duration-normal) var(--ease-standard);
}

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

.protection-card h3 {
  color: var(--color-primary);
  margin-bottom: var(--space-12);
}

.protection-card ul {
  margin: var(--space-12) 0 0 0;
  padding-left: var(--space-20);
}

.protection-card li {
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
}

.objects-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-16);
  margin: var(--space-24) 0;
}

.object-item {
  background: var(--color-primary);
  color: var(--color-btn-primary-text);
  padding: var(--space-12) var(--space-16);
  border-radius: var(--radius-full);
  font-weight: var(--font-weight-medium);
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.concepts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-24);
  margin: var(--space-24) 0;
}

.concept-card {
  background: var(--color-surface);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  padding: var(--space-24);
  transition: all var(--duration-normal) var(--ease-standard);
}

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

.concept-card h3 {
  color: var(--color-primary);
  margin-bottom: var(--space-12);
}

.concept-details {
  margin-top: var(--space-16);
}

.concept-details h4 {
  font-size: var(--font-size-md);
  margin: var(--space-12) 0 var(--space-8) 0;
  color: var(--color-text);
}

.concept-details ul {
  margin: 0;
  padding-left: var(--space-20);
}

.concept-details li {
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
}

.security-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-24);
  margin: var(--space-24) 0;
}

.feature-section {
  background: var(--color-secondary);
  padding: var(--space-20);
  border-radius: var(--radius-base);
}

.feature-section h4 {
  color: var(--color-primary);
  margin-bottom: var(--space-12);
}

.feature-section ul {
  margin: 0;
  padding-left: var(--space-20);
}

.feature-section li {
  margin-bottom: var(--space-8);
  color: var(--color-text-secondary);
}

/* Practice Exams */
.exam-interface {
  max-width: 900px;
  margin: 0 auto;
}

.exam-controls {
  background: var(--color-surface);
  padding: var(--space-24);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-card-border);
  margin-bottom: var(--space-32);
}

.exam-content {
  background: var(--color-surface);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.exam-header {
  background: var(--color-secondary);
  padding: var(--space-20);
  border-bottom: 1px solid var(--color-border);
}

.exam-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-16);
}

.exam-timer {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
}

.exam-progress {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-16);
}

#questionProgress {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.exam-questions {
  padding: var(--space-32);
  min-height: 400px;
}

.exam-navigation {
  background: var(--color-secondary);
  padding: var(--space-20);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.exam-results {
  background: var(--color-surface);
  padding: var(--space-32);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-card-border);
  text-align: center;
}

.results-summary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-32);
  margin: var(--space-32) 0;
}

.score-circle {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-full);
  background: conic-gradient(var(--color-primary) 0deg, var(--color-border) 0deg);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.score-circle::before {
  content: '';
  width: 80px;
  height: 80px;
  border-radius: var(--radius-full);
  background: var(--color-surface);
  position: absolute;
}

#finalScore {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  z-index: 1;
}

.results-breakdown {
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
}

.result-item {
  display: flex;
  justify-content: space-between;
  gap: var(--space-16);
  padding: var(--space-8);
  background: var(--color-secondary);
  border-radius: var(--radius-sm);
}

.performance-analysis {
  margin: var(--space-32) 0;
  text-align: left;
}

.performance-analysis h3 {
  margin-bottom: var(--space-16);
  color: var(--color-primary);
}

#modulePerformance {
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
}

.module-performance-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--color-secondary);
  padding: var(--space-12);
  border-radius: var(--radius-base);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .main-content {
    margin-left: 0;
  }
  
  .sidebar-toggle {
    display: block;
  }
  
  .modules-grid {
    grid-template-columns: 1fr;
  }
  
  .properties-grid {
    grid-template-columns: 1fr;
  }
  
  .modes-grid {
    grid-template-columns: 1fr;
  }
  
  .operations-grid {
    grid-template-columns: 1fr;
  }
  
  .protection-grid {
    grid-template-columns: 1fr;
  }
  
  .concepts-grid {
    grid-template-columns: 1fr;
  }
  
  .security-features {
    grid-template-columns: 1fr;
  }
  
  .results-summary {
    flex-direction: column;
    gap: var(--space-24);
  }
}

@media (max-width: 768px) {
  .main-content {
    padding: var(--space-16);
  }
  
  .hero h1 {
    font-size: var(--font-size-3xl);
  }
  
  .hero-subtitle {
    font-size: var(--font-size-lg);
  }
  
  .content-tabs {
    flex-wrap: wrap;
  }
  
  .tab-btn {
    flex: 1;
    min-width: 120px;
  }
  
  .step-item {
    flex-direction: column;
    gap: var(--space-12);
  }
  
  .step-number {
    align-self: flex-start;
  }
  
  .exam-info {
    flex-direction: column;
    gap: var(--space-12);
    align-items: flex-start;
  }
  
  .exam-progress {
    flex-direction: column;
    gap: var(--space-12);
  }
  
  .exam-navigation {
    flex-direction: column;
    gap: var(--space-12);
  }
  
  .parameters-grid {
    grid-template-columns: 1fr;
  }
  
  .comparison-table {
    font-size: var(--font-size-sm);
  }
  
  .comparison-table th,
  .comparison-table td {
    padding: var(--space-8) var(--space-12);
  }
}

@media (max-width: 480px) {
  .sidebar {
    width: 100%;
  }
  
  .hero h1 {
    font-size: var(--font-size-2xl);
  }
  
  .module-header h1 {
    font-size: var(--font-size-2xl);
  }
  
  .objects-list {
    flex-direction: column;
  }
  
  .object-item {
    justify-content: center;
  }
}

/* Animation utilities */
.fade-in {
  animation: fadeIn var(--duration-normal) var(--ease-standard);
}

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

.slide-up {
  animation: slideUp var(--duration-normal) var(--ease-standard);
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Loading states */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-full);
  border-top-color: var(--color-primary);
  animation: spin 1s linear infinite;
}

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

/* Accessibility improvements */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-primary);
  color: var(--color-btn-primary-text);
  padding: var(--space-8) var(--space-16);
  border-radius: var(--radius-base);
  text-decoration: none;
  z-index: 1000;
  transition: top var(--duration-fast) var(--ease-standard);
}

.skip-link:focus {
  top: 6px;
}

/* Focus management */
.tab-btn:focus-visible,
.nav-link:focus-visible,
.module-card:focus-visible {
  outline: var(--focus-outline);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .property-card,
  .mode-card,
  .protection-card,
  .concept-card {
    border: 2px solid var(--color-border);
  }
  
  .formula {
    border: 1px solid var(--color-border);
  }
  
  .status {
    border-width: 2px;
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .module-card:hover {
    transform: none;
  }
  
  .protection-card:hover,
  .concept-card:hover,
  .mode-card:hover {
    transform: none;
  }
}

/* Print styles */
@media print {
  .sidebar,
  .sidebar-toggle,
  .content-tabs,
  .exam-navigation,
  .theme-toggle {
    display: none !important;
  }
  
  .main-content {
    margin-left: 0 !important;
    padding: 0 !important;
  }
  
  .content-section {
    display: block !important;
  }
  
  .tab-pane {
    display: block !important;
  }
  
  .card {
    break-inside: avoid;
  }
  
  .algorithm-steps,
  .example-steps {
    break-inside: avoid;
  }
}