: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');
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: all var(--duration-normal) var(--ease-standard);
    backdrop-filter: blur(10px);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 var(--space-16);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-brand h2 {
    color: var(--color-primary);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    margin: 0;
}

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--space-24);
}

.nav-link {
    color: var(--color-text);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: color var(--duration-fast) var(--ease-standard);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-primary);
    transform: scaleX(0);
    transition: transform var(--duration-fast) var(--ease-standard);
}

.nav-link.active::after,
.nav-link:hover::after {
    transform: scaleX(1);
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: var(--space-16);
}

.theme-toggle {
    background: var(--color-secondary);
    border: none;
    border-radius: var(--radius-full);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-standard);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-4);
}

.nav-toggle .bar {
    width: 25px;
    height: 3px;
    background: var(--color-text);
    margin: 3px 0;
    transition: 0.3s;
}

/* Main Content */
.main-content {
    margin-top: 70px;
}

.page {
    display: none;
    min-height: calc(100vh - 70px);
    animation: fadeIn 0.5s ease-in-out;
}

.page.active {
    display: block;
}

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

/* Hero Section */
.hero-section {
    position: relative;
    min-height: 70vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    opacity: 0.05;
    z-index: -1;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-32);
    align-items: center;
    width: 100%;
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-16);
    color: var(--color-text);
}

.typing-text {
    position: relative;
    overflow: hidden;
    border-right: 3px solid var(--color-primary);
    white-space: nowrap;
    animation: typing 3s steps(20) infinite;
}

@keyframes typing {
    0%, 50% {
        width: 0;
    }
    100% {
        width: 100%;
    }
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-primary);
    margin-bottom: var(--space-16);
    font-weight: var(--font-weight-medium);
}

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-24);
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: var(--space-16);
}

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

.profile-image {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-16);
    box-shadow: var(--shadow-lg);
    transition: transform var(--duration-normal) var(--ease-standard);
}

.profile-image:hover {
    transform: scale(1.05);
}

.profile-placeholder {
    color: var(--color-btn-primary-text);
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
}

.profile-status {
    margin-top: var(--space-16);
}

/* Highlights Section */
.highlights-section {
    padding: var(--space-32) 0;
    background: var(--color-surface);
}

.highlights-section h2 {
    text-align: center;
    margin-bottom: var(--space-32);
    font-size: var(--font-size-3xl);
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-24);
}

.highlight-card {
    text-align: center;
    padding: var(--space-24);
    border-radius: var(--radius-lg);
    background: var(--color-background);
    border: 1px solid var(--color-border);
    transition: transform var(--duration-fast) var(--ease-standard);
}

.highlight-card:hover {
    transform: translateY(-5px);
}

.highlight-card h3 {
    font-size: var(--font-size-4xl);
    color: var(--color-primary);
    margin-bottom: var(--space-8);
}

.highlight-card p {
    color: var(--color-text-secondary);
    margin: 0;
}

/* Page Headers */
.page-header {
    text-align: center;
    margin-bottom: var(--space-32);
    padding: var(--space-32) 0;
}

.page-header h1 {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--space-16);
}

.page-header p {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
}

/* Research Grid */
.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--space-24);
}

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

.research-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

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

.research-applications {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-8);
    margin: var(--space-16) 0;
}

.tag {
    background: var(--color-secondary);
    color: var(--color-text);
    padding: var(--space-4) var(--space-8);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.research-demo,
.policy-simulator,
.nlp-demo,
.trading-demo {
    margin-top: var(--space-16);
    padding: var(--space-16);
    background: var(--color-background);
    border-radius: var(--radius-base);
}

.research-demo canvas,
.trading-demo canvas {
    width: 100%;
    max-width: 300px;
    height: auto;
    border-radius: var(--radius-base);
}

.simulation-result,
.sentiment-result {
    margin-top: var(--space-16);
    padding: var(--space-16);
    background: var(--color-surface);
    border-radius: var(--radius-base);
    border: 1px solid var(--color-border);
}

.nlp-demo textarea {
    margin-bottom: var(--space-16);
    min-height: 80px;
}

/* Papers List */
.papers-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-24);
}

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

.paper-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

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

.paper-meta {
    display: flex;
    gap: var(--space-16);
    margin-bottom: var(--space-16);
}

.journal {
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
}

.year {
    color: var(--color-primary);
    font-weight: var(--font-weight-bold);
}

.paper-abstract {
    margin-bottom: var(--space-16);
    color: var(--color-text-secondary);
}

.paper-actions {
    display: flex;
    gap: var(--space-12);
}

/* Conferences Timeline */
.conferences-timeline {
    display: flex;
    flex-direction: column;
    gap: var(--space-24);
}

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

.conference-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.conference-date {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 80px;
    margin-right: var(--space-24);
    padding: var(--space-16);
    background: var(--color-primary);
    color: var(--color-btn-primary-text);
    border-radius: var(--radius-base);
}

.conference-date .month {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.conference-date .day {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
}

.conference-date .year {
    font-size: var(--font-size-sm);
}

.conference-content {
    flex: 1;
}

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

.conference-location,
.conference-role,
.conference-topic {
    margin-bottom: var(--space-8);
    color: var(--color-text-secondary);
}

.conference-role {
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
}

.conference-link {
    margin-top: var(--space-16);
}

/* AI Tools Grid */
.ai-tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--space-24);
}

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

.ai-tool-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

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

.tool-interface {
    margin-top: var(--space-16);
}

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

.range-value {
    margin-left: var(--space-8);
    font-weight: var(--font-weight-medium);
    color: var(--color-primary);
}

.forecast-result,
.simulation-results,
.sentiment-analysis-result {
    margin-top: var(--space-16);
    padding: var(--space-16);
    background: var(--color-background);
    border-radius: var(--radius-base);
    border: 1px solid var(--color-border);
}

.forecast-result canvas {
    width: 100%;
    max-width: 400px;
    height: auto;
}

.result-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-16);
}

.metric-item {
    text-align: center;
    padding: var(--space-16);
    background: var(--color-surface);
    border-radius: var(--radius-base);
}

.metric-value {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    display: block;
}

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

.sentiment-score {
    text-align: center;
    margin-bottom: var(--space-16);
}

.sentiment-value {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
}

.sentiment-breakdown {
    display: flex;
    justify-content: space-between;
    gap: var(--space-16);
}

.sentiment-item {
    text-align: center;
    flex: 1;
}

/* About Page */
.about-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-32);
    align-items: start;
}

.about-profile {
    text-align: center;
    position: sticky;
    top: 100px;
}

.profile-image-large {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    background: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-16);
    box-shadow: var(--shadow-lg);
}

.profile-image-large .profile-placeholder {
    color: var(--color-btn-primary-text);
    font-size: 3rem;
    font-weight: var(--font-weight-bold);
}

.profile-info h2 {
    margin-bottom: var(--space-8);
}

.profile-info .title {
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--space-4);
}

.profile-info .affiliation {
    color: var(--color-text-secondary);
}

.about-details {
    display: flex;
    flex-direction: column;
    gap: var(--space-32);
}

.bio-section,
.expertise-section,
.skills-section {
    background: var(--color-surface);
    padding: var(--space-24);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.bio-section h3,
.expertise-section h3,
.skills-section h3 {
    color: var(--color-primary);
    margin-bottom: var(--space-16);
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-12);
}

.expertise-item {
    background: var(--color-secondary);
    padding: var(--space-12);
    border-radius: var(--radius-base);
    text-align: center;
    font-weight: var(--font-weight-medium);
}

.skills-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-16);
}

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

.skill-name {
    min-width: 150px;
    font-weight: var(--font-weight-medium);
}

.skill-bar {
    flex: 1;
    height: 8px;
    background: var(--color-secondary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: var(--color-primary);
    transition: width 1s ease-in-out;
}

/* Contact Page */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-32);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-24);
}

.contact-item {
    background: var(--color-surface);
    padding: var(--space-24);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

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

.contact-form {
    background: var(--color-surface);
    padding: var(--space-24);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.contact-form h3 {
    color: var(--color-primary);
    margin-bottom: var(--space-24);
}

/* Footnote Modal */
.footnote-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    opacity: 0;
    transition: opacity var(--duration-normal) var(--ease-standard);
}

.footnote-modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
}

.footnote-content {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    margin: var(--space-16);
    box-shadow: var(--shadow-lg);
    transform: translateY(-20px);
    transition: transform var(--duration-normal) var(--ease-standard);
}

.footnote-modal.active .footnote-content {
    transform: translateY(0);
}

.footnote-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-24);
    border-bottom: 1px solid var(--color-border);
}

.footnote-header h3 {
    color: var(--color-primary);
    margin: 0;
}

.footnote-close {
    background: none;
    border: none;
    font-size: var(--font-size-2xl);
    cursor: pointer;
    color: var(--color-text-secondary);
    padding: var(--space-4);
    border-radius: var(--radius-base);
    transition: color var(--duration-fast) var(--ease-standard);
}

.footnote-close:hover {
    color: var(--color-text);
}

.footnote-body {
    padding: var(--space-24);
}

/* Footer */
.footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--space-32) 0 var(--space-16);
    margin-top: var(--space-32);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-24);
    margin-bottom: var(--space-24);
}

.footer-section h4 {
    color: var(--color-primary);
    margin-bottom: var(--space-16);
}

.footer-section ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-section li {
    margin-bottom: var(--space-8);
}

.footer-section a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-standard);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--space-16);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-surface);
        border-top: 1px solid var(--color-border);
        padding: var(--space-16);
        gap: var(--space-16);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-text {
        order: 2;
    }

    .hero-image {
        order: 1;
    }

    .hero-title {
        font-size: var(--font-size-3xl);
    }

    .highlights-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .research-grid {
        grid-template-columns: 1fr;
    }

    .ai-tools-grid {
        grid-template-columns: 1fr;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .about-profile {
        position: static;
    }

    .contact-content {
        grid-template-columns: 1fr;
    }

    .conference-card {
        flex-direction: column;
        text-align: center;
    }

    .conference-date {
        margin-right: 0;
        margin-bottom: var(--space-16);
        align-self: center;
    }

    .paper-actions {
        flex-direction: column;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .highlights-grid {
        grid-template-columns: 1fr;
    }

    .hero-title {
        font-size: var(--font-size-2xl);
    }

    .page-header h1 {
        font-size: var(--font-size-3xl);
    }

    .research-card,
    .ai-tool-card {
        min-width: unset;
    }

    .expertise-grid {
        grid-template-columns: 1fr;
    }

    .sentiment-breakdown {
        flex-direction: column;
    }

    .result-metrics {
        grid-template-columns: 1fr;
    }
}

/* Animation Classes */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--duration-normal) var(--ease-standard);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: all var(--duration-normal) var(--ease-standard);
}

.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: all var(--duration-normal) var(--ease-standard);
}

.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* 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(--color-primary);
    border-top: 2px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Accessibility Improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --color-border: #000;
        --color-text: #000;
        --color-background: #fff;
        --color-surface: #fff;
    }
}

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

/* Print styles */
@media print {
    .navbar,
    .footer,
    .theme-toggle,
    .nav-toggle,
    .btn {
        display: none;
    }

    .main-content {
        margin-top: 0;
    }

    .page {
        display: block !important;
        page-break-after: always;
    }

    .page:last-child {
        page-break-after: auto;
    }
}






.circle {
  width: 150px;         /* Adjust size as needed */
  height: 150px;
  border-radius: 50%;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #eee;     /* Optional: background color */
}

.profile-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  display: block;
}












/* Teaching Section Styling - Updated to match website design system */
.teaching-section {
    margin: var(--space-32) 0;
    padding: var(--space-24) 0;
    border-top: 1px solid var(--color-border);
}

.teaching-section h3 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--space-16);
    color: var(--color-primary);
    text-align: center;
    font-weight: var(--font-weight-semibold);
}

.courses-intro {
    text-align: center;
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-24);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    line-height: var(--line-height-normal);
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-24);
    margin-bottom: var(--space-32);
}

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

.course-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--color-primary);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.course-icon {
    width: 50px;
    height: 50px;
    background: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-16);
    font-size: var(--font-size-xl);
    color: var(--color-btn-primary-text);
}

.course-card h4 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-8);
    color: var(--color-text);
    font-weight: var(--font-weight-semibold);
}

.course-code {
    background: var(--color-secondary);
    color: var(--color-primary);
    padding: var(--space-4) var(--space-12);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    display: inline-block;
    margin-bottom: var(--space-12);
}

.course-description {
    color: var(--color-text-secondary);
    line-height: var(--line-height-normal);
    margin-bottom: var(--space-16);
    font-size: var(--font-size-base);
}

.course-topics {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-8);
}

.topic-tag {
    background: var(--color-secondary);
    color: var(--color-text);
    padding: var(--space-4) var(--space-8);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    border: 1px solid var(--color-border);
    transition: all var(--duration-fast) var(--ease-standard);
}

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

.course-schedule {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--space-24);
    border: 1px solid var(--color-card-border);
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.course-schedule h4 {
    color: var(--color-primary);
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-16);
    font-weight: var(--font-weight-semibold);
}

.schedule-info {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: var(--space-16);
}

.schedule-item {
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
}

.schedule-item strong {
    color: var(--color-text);
    display: block;
    margin-bottom: var(--space-4);
    font-weight: var(--font-weight-medium);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .courses-grid {
        grid-template-columns: 1fr;
        gap: var(--space-16);
    }
    
    .schedule-info {
        flex-direction: column;
        text-align: center;
    }
    
    .teaching-section h3 {
        font-size: var(--font-size-2xl);
    }
    
    .course-card {
        padding: var(--space-16);
    }
    
    .courses-intro {
        font-size: var(--font-size-base);
        margin-bottom: var(--space-16);
    }
}

@media (max-width: 480px) {
    .teaching-section {
        margin: var(--space-24) 0;
        padding: var(--space-16) 0;
    }
    
    .teaching-section h3 {
        font-size: var(--font-size-xl);
    }
    
    .course-card {
        padding: var(--space-12);
    }
}