:root {
  /* Primitive Color Tokens */
  --color-white: rgba(255, 255, 255, 1);
  --color-black: rgba(0, 0, 0, 1);
  --color-cream-50: rgba(252, 252, 249, 1);
  --color-cream-100: rgba(255, 255, 253, 1);
  --color-gray-200: rgba(245, 245, 245, 1);
  --color-gray-300: rgba(167, 169, 169, 1);
  --color-gray-400: rgba(119, 124, 124, 1);
  --color-slate-500: rgba(98, 108, 113, 1);
  --color-brown-600: rgba(94, 82, 64, 1);
  --color-charcoal-700: rgba(31, 33, 33, 1);
  --color-charcoal-800: rgba(38, 40, 40, 1);
  --color-slate-900: rgba(19, 52, 59, 1);
  --color-teal-300: rgba(50, 184, 198, 1);
  --color-teal-400: rgba(45, 166, 178, 1);
  --color-teal-500: rgba(33, 128, 141, 1);
  --color-teal-600: rgba(29, 116, 128, 1);
  --color-teal-700: rgba(26, 104, 115, 1);
  --color-teal-800: rgba(41, 150, 161, 1);
  --color-red-400: rgba(255, 84, 89, 1);
  --color-red-500: rgba(192, 21, 47, 1);
  --color-orange-400: rgba(230, 129, 97, 1);
  --color-orange-500: rgba(168, 75, 47, 1);

  /* RGB versions for opacity control */
  --color-brown-600-rgb: 94, 82, 64;
  --color-teal-500-rgb: 33, 128, 141;
  --color-slate-900-rgb: 19, 52, 59;
  --color-slate-500-rgb: 98, 108, 113;
  --color-red-500-rgb: 192, 21, 47;
  --color-red-400-rgb: 255, 84, 89;
  --color-orange-500-rgb: 168, 75, 47;
  --color-orange-400-rgb: 230, 129, 97;

  /* Background color tokens (Light Mode) */
  --color-bg-1: rgba(59, 130, 246, 0.08); /* Light blue */
  --color-bg-2: rgba(245, 158, 11, 0.08); /* Light yellow */
  --color-bg-3: rgba(34, 197, 94, 0.08); /* Light green */
  --color-bg-4: rgba(239, 68, 68, 0.08); /* Light red */
  --color-bg-5: rgba(147, 51, 234, 0.08); /* Light purple */
  --color-bg-6: rgba(249, 115, 22, 0.08); /* Light orange */
  --color-bg-7: rgba(236, 72, 153, 0.08); /* Light pink */
  --color-bg-8: rgba(6, 182, 212, 0.08); /* Light cyan */

  /* Semantic Color Tokens (Light Mode) */
  --color-background: var(--color-cream-50);
  --color-surface: var(--color-cream-100);
  --color-text: var(--color-slate-900);
  --color-text-secondary: var(--color-slate-500);
  --color-primary: var(--color-teal-500);
  --color-primary-hover: var(--color-teal-600);
  --color-primary-active: var(--color-teal-700);
  --color-secondary: rgba(var(--color-brown-600-rgb), 0.12);
  --color-secondary-hover: rgba(var(--color-brown-600-rgb), 0.2);
  --color-secondary-active: rgba(var(--color-brown-600-rgb), 0.25);
  --color-border: rgba(var(--color-brown-600-rgb), 0.2);
  --color-btn-primary-text: var(--color-cream-50);
  --color-card-border: rgba(var(--color-brown-600-rgb), 0.12);
  --color-card-border-inner: rgba(var(--color-brown-600-rgb), 0.12);
  --color-error: var(--color-red-500);
  --color-success: var(--color-teal-500);
  --color-warning: var(--color-orange-500);
  --color-info: var(--color-slate-500);
  --color-focus-ring: rgba(var(--color-teal-500-rgb), 0.4);
  --color-select-caret: rgba(var(--color-slate-900-rgb), 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 {
    /* RGB versions for opacity control (Dark Mode) */
    --color-gray-400-rgb: 119, 124, 124;
    --color-teal-300-rgb: 50, 184, 198;
    --color-gray-300-rgb: 167, 169, 169;
    --color-gray-200-rgb: 245, 245, 245;

    /* Background color tokens (Dark Mode) */
    --color-bg-1: rgba(29, 78, 216, 0.15); /* Dark blue */
    --color-bg-2: rgba(180, 83, 9, 0.15); /* Dark yellow */
    --color-bg-3: rgba(21, 128, 61, 0.15); /* Dark green */
    --color-bg-4: rgba(185, 28, 28, 0.15); /* Dark red */
    --color-bg-5: rgba(107, 33, 168, 0.15); /* Dark purple */
    --color-bg-6: rgba(194, 65, 12, 0.15); /* Dark orange */
    --color-bg-7: rgba(190, 24, 93, 0.15); /* Dark pink */
    --color-bg-8: rgba(8, 145, 178, 0.15); /* Dark cyan */
    
    /* Semantic Color Tokens (Dark Mode) */
    --color-background: var(--color-charcoal-700);
    --color-surface: var(--color-charcoal-800);
    --color-text: var(--color-gray-200);
    --color-text-secondary: rgba(var(--color-gray-300-rgb), 0.7);
    --color-primary: var(--color-teal-300);
    --color-primary-hover: var(--color-teal-400);
    --color-primary-active: var(--color-teal-800);
    --color-secondary: rgba(var(--color-gray-400-rgb), 0.15);
    --color-secondary-hover: rgba(var(--color-gray-400-rgb), 0.25);
    --color-secondary-active: rgba(var(--color-gray-400-rgb), 0.3);
    --color-border: rgba(var(--color-gray-400-rgb), 0.3);
    --color-error: var(--color-red-400);
    --color-success: var(--color-teal-300);
    --color-warning: var(--color-orange-400);
    --color-info: var(--color-gray-300);
    --color-focus-ring: rgba(var(--color-teal-300-rgb), 0.4);
    --color-btn-primary-text: var(--color-slate-900);
    --color-card-border: rgba(var(--color-gray-400-rgb), 0.2);
    --color-card-border-inner: rgba(var(--color-gray-400-rgb), 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(var(--color-gray-400-rgb), 0.2);
    --color-border-secondary: rgba(var(--color-gray-400-rgb), 0.2);
    --color-select-caret: rgba(var(--color-gray-200-rgb), 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: var(--color-teal-300-rgb);
    --color-error-rgb: var(--color-red-400-rgb);
    --color-warning-rgb: var(--color-orange-400-rgb);
    --color-info-rgb: var(--color-gray-300-rgb);
  }
}

/* Data attribute for manual theme switching */
[data-color-scheme="dark"] {
  /* RGB versions for opacity control (dark mode) */
  --color-gray-400-rgb: 119, 124, 124;
  --color-teal-300-rgb: 50, 184, 198;
  --color-gray-300-rgb: 167, 169, 169;
  --color-gray-200-rgb: 245, 245, 245;

  /* Colorful background palette - Dark Mode */
  --color-bg-1: rgba(29, 78, 216, 0.15); /* Dark blue */
  --color-bg-2: rgba(180, 83, 9, 0.15); /* Dark yellow */
  --color-bg-3: rgba(21, 128, 61, 0.15); /* Dark green */
  --color-bg-4: rgba(185, 28, 28, 0.15); /* Dark red */
  --color-bg-5: rgba(107, 33, 168, 0.15); /* Dark purple */
  --color-bg-6: rgba(194, 65, 12, 0.15); /* Dark orange */
  --color-bg-7: rgba(190, 24, 93, 0.15); /* Dark pink */
  --color-bg-8: rgba(8, 145, 178, 0.15); /* Dark cyan */
  
  /* Semantic Color Tokens (Dark Mode) */
  --color-background: var(--color-charcoal-700);
  --color-surface: var(--color-charcoal-800);
  --color-text: var(--color-gray-200);
  --color-text-secondary: rgba(var(--color-gray-300-rgb), 0.7);
  --color-primary: var(--color-teal-300);
  --color-primary-hover: var(--color-teal-400);
  --color-primary-active: var(--color-teal-800);
  --color-secondary: rgba(var(--color-gray-400-rgb), 0.15);
  --color-secondary-hover: rgba(var(--color-gray-400-rgb), 0.25);
  --color-secondary-active: rgba(var(--color-gray-400-rgb), 0.3);
  --color-border: rgba(var(--color-gray-400-rgb), 0.3);
  --color-error: var(--color-red-400);
  --color-success: var(--color-teal-300);
  --color-warning: var(--color-orange-400);
  --color-info: var(--color-gray-300);
  --color-focus-ring: rgba(var(--color-teal-300-rgb), 0.4);
  --color-btn-primary-text: var(--color-slate-900);
  --color-card-border: rgba(var(--color-gray-400-rgb), 0.15);
  --color-card-border-inner: rgba(var(--color-gray-400-rgb), 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(var(--color-gray-400-rgb), 0.2);
  --color-select-caret: rgba(var(--color-gray-200-rgb), 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: var(--color-teal-300-rgb);
  --color-error-rgb: var(--color-red-400-rgb);
  --color-warning-rgb: var(--color-orange-400-rgb);
  --color-info-rgb: var(--color-gray-300-rgb);
}

[data-color-scheme="light"] {
  /* RGB versions for opacity control (light mode) */
  --color-brown-600-rgb: 94, 82, 64;
  --color-teal-500-rgb: 33, 128, 141;
  --color-slate-900-rgb: 19, 52, 59;
  
  /* Semantic Color Tokens (Light Mode) */
  --color-background: var(--color-cream-50);
  --color-surface: var(--color-cream-100);
  --color-text: var(--color-slate-900);
  --color-text-secondary: var(--color-slate-500);
  --color-primary: var(--color-teal-500);
  --color-primary-hover: var(--color-teal-600);
  --color-primary-active: var(--color-teal-700);
  --color-secondary: rgba(var(--color-brown-600-rgb), 0.12);
  --color-secondary-hover: rgba(var(--color-brown-600-rgb), 0.2);
  --color-secondary-active: rgba(var(--color-brown-600-rgb), 0.25);
  --color-border: rgba(var(--color-brown-600-rgb), 0.2);
  --color-btn-primary-text: var(--color-cream-50);
  --color-card-border: rgba(var(--color-brown-600-rgb), 0.12);
  --color-card-border-inner: rgba(var(--color-brown-600-rgb), 0.12);
  --color-error: var(--color-red-500);
  --color-success: var(--color-teal-500);
  --color-warning: var(--color-orange-500);
  --color-info: var(--color-slate-500);
  --color-focus-ring: rgba(var(--color-teal-500-rgb), 0.4);

  /* RGB versions for light mode */
  --color-success-rgb: var(--color-teal-500-rgb);
  --color-error-rgb: var(--color-red-500-rgb);
  --color-warning-rgb: var(--color-orange-500-rgb);
  --color-info-rgb: var(--color-slate-500-rgb);
}

/* 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 */
/* Professional Wingdings Translator - Enhanced with Dark Mode & Animations */

/* Theme Variables - Color Psychology Applied */
:root {
  /* Light Theme - Professional & Trustworthy */
  --theme-bg-primary: #fafbfc;
  --theme-bg-secondary: #ffffff;
  --theme-bg-tertiary: #f8f9fa;
  --theme-text-primary: #0f172a;
  --theme-text-secondary: #64748b;
  --theme-text-muted: #94a3b8;
  --theme-accent-primary: #2563eb;
  --theme-accent-secondary: #f59e0b;
  --theme-accent-success: #10b981;
  --theme-accent-error: #ef4444;
  --theme-border-light: #e2e8f0;
  --theme-border-medium: #cbd5e1;
  --theme-shadow-light: rgba(15, 23, 42, 0.04);
  --theme-shadow-medium: rgba(15, 23, 42, 0.08);
  --theme-shadow-strong: rgba(15, 23, 42, 0.12);
  
  /* Animation & Transition Variables */
  --motion-duration-fast: 150ms;
  --motion-duration-normal: 250ms;
  --motion-duration-slow: 350ms;
  --motion-ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
  --motion-ease-decelerate: cubic-bezier(0, 0, 0.2, 1);
  --motion-ease-accelerate: cubic-bezier(0.4, 0, 1, 1);
  
  /* Spacing & Layout */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  
  /* Typography */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Z-Index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1010;
  --z-fixed: 1020;
  --z-modal: 1030;
  --z-toast: 1040;
  --z-tooltip: 1050;
}

/* Dark Theme Variables */
[data-theme="dark"] {
  --theme-bg-primary: #0f172a;
  --theme-bg-secondary: #1e293b;
  --theme-bg-tertiary: #334155;
  --theme-text-primary: #f8fafc;
  --theme-text-secondary: #cbd5e1;
  --theme-text-muted: #94a3b8;
  --theme-accent-primary: #3b82f6;
  --theme-accent-secondary: #fbbf24;
  --theme-accent-success: #22c55e;
  --theme-accent-error: #f87171;
  --theme-border-light: #334155;
  --theme-border-medium: #475569;
  --theme-shadow-light: rgba(0, 0, 0, 0.2);
  --theme-shadow-medium: rgba(0, 0, 0, 0.3);
  --theme-shadow-strong: rgba(0, 0, 0, 0.4);
}

/* Auto Dark Mode */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --theme-bg-primary: #0f172a;
    --theme-bg-secondary: #1e293b;
    --theme-bg-tertiary: #334155;
    --theme-text-primary: #f8fafc;
    --theme-text-secondary: #cbd5e1;
    --theme-text-muted: #94a3b8;
    --theme-accent-primary: #3b82f6;
    --theme-accent-secondary: #fbbf24;
    --theme-accent-success: #22c55e;
    --theme-accent-error: #f87171;
    --theme-border-light: #334155;
    --theme-border-medium: #475569;
    --theme-shadow-light: rgba(0, 0, 0, 0.2);
    --theme-shadow-medium: rgba(0, 0, 0, 0.3);
    --theme-shadow-strong: rgba(0, 0, 0, 0.4);
  }
}

/* Base Styles */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--theme-bg-primary);
  color: var(--theme-text-primary);
  line-height: 1.6;
  margin: 0;
  padding: 0;
  transition: background-color var(--motion-duration-normal) var(--motion-ease-standard),
              color var(--motion-duration-normal) var(--motion-ease-standard);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  margin: 0;
  letter-spacing: -0.025em;
}

p {
  margin: 0;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-md);
  }
}

/* Header Styles */
.header {
  background: var(--theme-bg-secondary);
  border-bottom: 1px solid var(--theme-border-light);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  backdrop-filter: blur(12px);
  transition: all var(--motion-duration-normal) var(--motion-ease-standard);
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) 0;
}

.logo-section {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.25rem;
  font-weight: var(--font-weight-bold);
  color: var(--theme-accent-primary);
}

.logo-icon {
  width: 2rem;
  height: 2rem;
  animation: logoFloat 3s ease-in-out infinite;
}

@keyframes logoFloat {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-4px); }
}

/* Breadcrumb */
.breadcrumb ol {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--space-sm);
  font-size: 0.875rem;
  color: var(--theme-text-secondary);
}

.breadcrumb li:not(:last-child)::after {
  content: '/';
  margin-left: var(--space-sm);
  color: var(--theme-text-muted);
}

.breadcrumb a {
  color: var(--theme-accent-primary);
  text-decoration: none;
  transition: color var(--motion-duration-fast) var(--motion-ease-standard);
}

.breadcrumb a:hover {
  color: var(--theme-accent-secondary);
}

/* Theme Toggle */
.theme-toggle {
  position: relative;
  width: 3rem;
  height: 3rem;
  background: var(--theme-bg-tertiary);
  border: 1px solid var(--theme-border-light);
  border-radius: var(--radius-full);
  cursor: pointer;
  overflow: hidden;
  transition: all var(--motion-duration-normal) var(--motion-ease-standard);
}

.theme-toggle:hover {
  background: var(--theme-accent-primary);
  border-color: var(--theme-accent-primary);
  box-shadow: 0 4px 12px var(--theme-shadow-medium);
  transform: translateY(-1px);
}

.theme-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 1.25rem;
  height: 1.25rem;
  transform: translate(-50%, -50%);
  transition: all var(--motion-duration-slow) var(--motion-ease-standard);
}

.theme-icon--light {
  opacity: 1;
  rotate: 0deg;
  scale: 1;
}

.theme-icon--dark {
  opacity: 0;
  rotate: 180deg;
  scale: 0.8;
}

[data-theme="dark"] .theme-icon--light {
  opacity: 0;
  rotate: -180deg;
  scale: 0.8;
}

[data-theme="dark"] .theme-icon--dark {
  opacity: 1;
  rotate: 0deg;
  scale: 1;
}

.theme-toggle:hover .theme-icon {
  color: white;
}

/* Hero Section */
.hero-section {
  text-align: center;
  padding: var(--space-2xl) 0 var(--space-xl);
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin-bottom: var(--space-lg);
  background: linear-gradient(135deg, var(--theme-accent-primary), var(--theme-accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: titleSlideIn 0.8s var(--motion-ease-decelerate);
}

@keyframes titleSlideIn {
  from {
    opacity: 0;
    transform: translateY(2rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-description {
  font-size: 1.125rem;
  color: var(--theme-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
  animation: fadeInUp 0.8s var(--motion-ease-decelerate) 0.2s both;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(1rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-features {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s var(--motion-ease-decelerate) 0.4s both;
}

.feature-badge {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--theme-bg-tertiary);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: var(--font-weight-medium);
  border: 1px solid var(--theme-border-light);
  transition: all var(--motion-duration-normal) var(--motion-ease-standard);
}

.feature-badge:hover {
  background: var(--theme-accent-primary);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px var(--theme-shadow-medium);
}

.feature-icon {
  width: 1rem;
  height: 1rem;
}

/* Tool Section */
.tool-section {
  margin-bottom: var(--space-3xl);
}

.tool-card {
  background: var(--theme-bg-secondary);
  border: 1px solid var(--theme-border-light);
  border-radius: var(--radius-xl);
  box-shadow: 0 4px 24px var(--theme-shadow-light);
  overflow: hidden;
  animation: cardSlideIn 0.6s var(--motion-ease-decelerate) 0.6s both;
}

@keyframes cardSlideIn {
  from {
    opacity: 0;
    transform: translateY(2rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.tool-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-xl);
  border-bottom: 1px solid var(--theme-border-light);
  background: linear-gradient(135deg, var(--theme-bg-tertiary), var(--theme-bg-secondary));
}

.tool-header h2 {
  font-size: 1.5rem;
  color: var(--theme-text-primary);
}

/* Mode Toggle */
.mode-toggle {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
}

.mode-label {
  font-size: 0.875rem;
  font-weight: var(--font-weight-medium);
  color: var(--theme-text-secondary);
  margin-right: var(--space-sm);
}

.mode-btn {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: transparent;
  border: 1px solid var(--theme-border-medium);
  border-radius: var(--radius-md);
  color: var(--theme-text-secondary);
  font-size: 0.875rem;
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--motion-duration-normal) var(--motion-ease-standard);
}

.mode-btn:hover {
  border-color: var(--theme-accent-primary);
  transform: translateY(-1px);
}

.mode-btn--active {
  background: var(--theme-accent-primary);
  border-color: var(--theme-accent-primary);
  color: white;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.mode-icon {
  width: 1rem;
  height: 1rem;
}

/* Translator Grid */
.translator-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  padding: var(--space-xl);
}

@media (max-width: 768px) {
  .translator-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    padding: var(--space-lg);
  }
}

/* Panel Styles */
.input-panel,
.output-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.panel-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1rem;
  font-weight: var(--font-weight-semibold);
  color: var(--theme-text-primary);
}

.panel-icon {
  width: 1.25rem;
  height: 1.25rem;
  color: var(--theme-accent-primary);
}

/* Character Counter */
.char-counter {
  display: flex;
  align-items: baseline;
  gap: var(--space-xs);
  font-size: 0.875rem;
}

#char-count {
  font-weight: var(--font-weight-bold);
  color: var(--theme-accent-primary);
  min-width: 2ch;
  transition: color var(--motion-duration-fast) var(--motion-ease-standard);
}

.char-label {
  color: var(--theme-text-muted);
}

/* Input Container */
.input-container {
  position: relative;
}

.text-input {
  width: 100%;
  min-height: 200px;
  padding: var(--space-md);
  background: var(--theme-bg-primary);
  border: 2px solid var(--theme-border-light);
  border-radius: var(--radius-lg);
  font-family: inherit;
  font-size: 1rem;
  color: var(--theme-text-primary);
  resize: vertical;
  transition: all var(--motion-duration-normal) var(--motion-ease-standard);
}

.text-input:focus {
  outline: none;
  border-color: var(--theme-accent-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
  transform: translateY(-1px);
}

.text-input::placeholder {
  color: var(--theme-text-muted);
}

.input-actions {
  position: absolute;
  bottom: var(--space-md);
  right: var(--space-sm);
}

.input-help {
  color: var(--theme-text-muted);
  font-size: 0.875rem;
  margin-top: var(--space-xs);
}

/* Output Container */
.output-container {
  position: relative;
}

.output-status {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.875rem;
  color: var(--theme-text-secondary);
}

.status-dot {
  width: 0.5rem;
  height: 0.5rem;
  background: var(--theme-accent-success);
  border-radius: var(--radius-full);
  animation: statusPulse 2s ease-in-out infinite;
}

@keyframes statusPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.output-display {
  min-height: 200px;
  padding: var(--space-md);
  background: var(--theme-bg-primary);
  border: 2px solid var(--theme-border-light);
  border-radius: var(--radius-lg);
  font-size: 1.125rem;
  line-height: 1.6;
  word-break: break-all;
  overflow-wrap: break-word;
  white-space: pre-wrap;
  transition: all var(--motion-duration-normal) var(--motion-ease-standard);
  position: relative;
}

.output-display:not(:empty) {
  border-color: var(--theme-accent-success);
  box-shadow: 0 0 0 1px rgba(16, 185, 129, 0.1);
}

.output-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  height: 100%;
  min-height: 168px;
  color: var(--theme-text-muted);
  font-style: italic;
}

.placeholder-icon {
  width: 1.5rem;
  height: 1.5rem;
  animation: placeholderFloat 3s ease-in-out infinite;
}

@keyframes placeholderFloat {
  0%, 100% { transform: translateX(0px); }
  50% { transform: translateX(-4px); }
}

.output-actions {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-md);
  flex-wrap: wrap;
}

/* Action Buttons */
.action-btn {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--motion-duration-normal) var(--motion-ease-standard);
  position: relative;
  overflow: hidden;
}

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

.action-btn:hover::before {
  left: 100%;
}

.action-btn--primary {
  background: var(--theme-accent-primary);
  color: white;
}

.action-btn--primary:hover {
  background: #1d4ed8;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.4);
}

.action-btn--secondary {
  background: var(--theme-bg-tertiary);
  color: var(--theme-text-primary);
  border: 1px solid var(--theme-border-light);
}

.action-btn--secondary:hover {
  background: var(--theme-accent-secondary);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px var(--theme-shadow-medium);
}

.action-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.action-btn:disabled::before {
  display: none;
}

.btn-icon {
  width: 1rem;
  height: 1rem;
}

/* Success Animation for Copy Button */
.action-btn--success {
  background: var(--theme-accent-success);
  color: white;
}

.action-btn--success .btn-icon {
  animation: successBounce 0.6s var(--motion-ease-decelerate);
}

@keyframes successBounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-4px);
  }
  60% {
    transform: translateY(-2px);
  }
}

/* Section Styles */
.reference-section,
.guide-section,
.faq-section {
  margin-bottom: var(--space-3xl);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-header h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin-bottom: var(--space-md);
  color: var(--theme-text-primary);
}

.section-description {
  font-size: 1.125rem;
  color: var(--theme-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* Reference Card */
.reference-card {
  background: var(--theme-bg-secondary);
  border: 1px solid var(--theme-border-light);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  box-shadow: 0 4px 24px var(--theme-shadow-light);
}

.reference-controls {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
  align-items: end;
}

@media (max-width: 768px) {
  .reference-controls {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

/* Search Container */
.search-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.search-input-wrapper {
  position: relative;
}

.search-icon {
  position: absolute;
  left: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  width: 1rem;
  height: 1rem;
  color: var(--theme-text-muted);
}

.search-input {
  width: 100%;
  padding: var(--space-sm) var(--space-md) var(--space-sm) calc(var(--space-md) * 2.5);
  background: var(--theme-bg-primary);
  border: 1px solid var(--theme-border-light);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: var(--theme-text-primary);
  transition: all var(--motion-duration-normal) var(--motion-ease-standard);
}

.search-input:focus {
  outline: none;
  border-color: var(--theme-accent-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-clear {
  position: absolute;
  right: var(--space-sm);
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  padding: var(--space-xs);
  cursor: pointer;
  color: var(--theme-text-muted);
  border-radius: var(--radius-sm);
  transition: all var(--motion-duration-fast) var(--motion-ease-standard);
  opacity: 0;
  pointer-events: none;
}

.search-input:not(:placeholder-shown) + .search-clear {
  opacity: 1;
  pointer-events: auto;
}

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

.clear-icon {
  width: 0.875rem;
  height: 0.875rem;
}

.search-help {
  color: var(--theme-text-muted);
  font-size: 0.75rem;
}

/* Filter Container */
.filter-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.filter-label {
  font-size: 0.875rem;
  font-weight: var(--font-weight-medium);
  color: var(--theme-text-secondary);
}

.filter-buttons {
  display: flex;
  gap: var(--space-xs);
  flex-wrap: wrap;
}

.filter-btn {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  background: var(--theme-bg-primary);
  border: 1px solid var(--theme-border-light);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: var(--font-weight-medium);
  color: var(--theme-text-secondary);
  cursor: pointer;
  transition: all var(--motion-duration-normal) var(--motion-ease-standard);
}

.filter-btn:hover {
  background: var(--theme-bg-tertiary);
  border-color: var(--theme-accent-primary);
  transform: translateY(-1px);
}

.filter-btn--active {
  background: var(--theme-accent-primary);
  border-color: var(--theme-accent-primary);
  color: white;
}

.filter-icon {
  width: 0.875rem;
  height: 0.875rem;
}

/* Symbol Grid */
.symbol-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: var(--space-md);
  max-height: 400px;
  overflow-y: auto;
  padding: var(--space-md);
  background: var(--theme-bg-primary);
  border: 1px solid var(--theme-border-light);
  border-radius: var(--radius-lg);
}

.symbol-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
  background: var(--theme-bg-secondary);
  border: 1px solid var(--theme-border-light);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--motion-duration-normal) var(--motion-ease-standard);
  min-height: 80px;
}

.symbol-item:hover {
  background: var(--theme-accent-primary);
  color: white;
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 8px 20px var(--theme-shadow-medium);
}

.symbol-char {
  font-size: 1.5rem;
  margin-bottom: var(--space-xs);
}

.symbol-code {
  font-size: 0.75rem;
  font-weight: var(--font-weight-medium);
  opacity: 0.7;
}

/* Guide Section */
.guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.guide-step {
  text-align: center;
  padding: var(--space-xl);
  background: var(--theme-bg-secondary);
  border: 1px solid var(--theme-border-light);
  border-radius: var(--radius-xl);
  transition: all var(--motion-duration-normal) var(--motion-ease-standard);
  position: relative;
  overflow: hidden;
}

.guide-step::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--theme-accent-primary), var(--theme-accent-secondary));
  transform: scaleX(0);
  transition: transform var(--motion-duration-normal) var(--motion-ease-standard);
}

.guide-step:hover::before {
  transform: scaleX(1);
}

.guide-step:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px var(--theme-shadow-medium);
}

.step-icon {
  position: relative;
  width: 4rem;
  height: 4rem;
  background: linear-gradient(135deg, var(--theme-accent-primary), var(--theme-accent-secondary));
  border-radius: var(--radius-full);
  margin: 0 auto var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.step-icon svg {
  width: 1.5rem;
  height: 1.5rem;
}

.step-number {
  position: absolute;
  top: -0.5rem;
  right: -0.5rem;
  width: 1.5rem;
  height: 1.5rem;
  background: var(--theme-accent-secondary);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: var(--font-weight-bold);
  color: white;
}

.step-title {
  font-size: 1.25rem;
  margin-bottom: var(--space-md);
  color: var(--theme-text-primary);
}

.step-description {
  color: var(--theme-text-secondary);
  line-height: 1.6;
}

/* FAQ Section */
.faq-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--space-lg);
}

.faq-item {
  padding: var(--space-xl);
  background: var(--theme-bg-secondary);
  border: 1px solid var(--theme-border-light);
  border-radius: var(--radius-lg);
  transition: all var(--motion-duration-normal) var(--motion-ease-standard);
}

.faq-item:hover {
  box-shadow: 0 8px 24px var(--theme-shadow-medium);
  transform: translateY(-2px);
}

.faq-question {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: 1.125rem;
  margin-bottom: var(--space-md);
  color: var(--theme-text-primary);
}

.faq-icon {
  width: 1.25rem;
  height: 1.25rem;
  color: var(--theme-accent-primary);
}

.faq-answer {
  color: var(--theme-text-secondary);
  line-height: 1.6;
}

/* Footer */
.footer {
  background: var(--theme-bg-secondary);
  border-top: 1px solid var(--theme-border-light);
  margin-top: var(--space-3xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-xl);
  padding: var(--space-2xl) 0 var(--space-xl);
}

.footer-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.footer-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.125rem;
  font-weight: var(--font-weight-bold);
  color: var(--theme-text-primary);
  margin-bottom: var(--space-sm);
}

.footer-icon {
  width: 1.25rem;
  height: 1.25rem;
  color: var(--theme-accent-primary);
}

.footer-text {
  color: var(--theme-text-secondary);
  line-height: 1.6;
  margin: 0;
}

.footer-note {
  font-size: 0.875rem;
  color: var(--theme-text-muted);
  margin: 0;
}

.footer-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-list li {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--theme-text-secondary);
  font-size: 0.875rem;
}

.list-icon {
  width: 1rem;
  height: 1rem;
  color: var(--theme-accent-success);
}

.footer-bottom {
  text-align: center;
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--theme-border-light);
  color: var(--theme-text-muted);
  font-size: 0.875rem;
}

/* Toast Notification */
.toast {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  background: var(--theme-bg-secondary);
  border: 1px solid var(--theme-border-light);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 40px var(--theme-shadow-strong);
  padding: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  min-width: 300px;
  z-index: var(--z-toast);
  transform: translateX(calc(100% + var(--space-lg)));
  transition: transform var(--motion-duration-slow) var(--motion-ease-standard);
}

.toast.show {
  transform: translateX(0);
}

.toast.success {
  border-color: var(--theme-accent-success);
}

.toast.success .toast-icon {
  color: var(--theme-accent-success);
}

.toast.error {
  border-color: var(--theme-accent-error);
}

.toast.error .toast-icon {
  color: var(--theme-accent-error);
}

.toast-content {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex: 1;
}

.toast-icon {
  width: 1.25rem;
  height: 1.25rem;
}

.toast-text {
  font-weight: var(--font-weight-medium);
  color: var(--theme-text-primary);
}

.toast-close {
  background: none;
  border: none;
  padding: var(--space-xs);
  cursor: pointer;
  color: var(--theme-text-muted);
  border-radius: var(--radius-sm);
  transition: all var(--motion-duration-fast) var(--motion-ease-standard);
}

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

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  transition: opacity var(--motion-duration-normal) var(--motion-ease-standard);
}

.loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
  background: var(--theme-bg-secondary);
  padding: var(--space-2xl);
  border-radius: var(--radius-xl);
  box-shadow: 0 20px 60px var(--theme-shadow-strong);
}

.spinner-icon {
  width: 2rem;
  height: 2rem;
  color: var(--theme-accent-primary);
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.loading-text {
  color: var(--theme-text-primary);
  font-weight: var(--font-weight-medium);
}

/* 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-width: 0;
}

.hidden {
  display: none !important;
}

/* Responsive Design */
@media (max-width: 640px) {
  .hero-features {
    flex-direction: row;
    align-items: center;
    display: none;
  }

  .hero-section {
  text-align: center;
  padding: var(--space-md) 0 var(--space-md);
  display: none;
}
  
  .tool-header {
    flex-direction: column;
    gap: var(--space-lg);
    align-items: flex-start;
  }
  
  .mode-toggle {
    align-self: stretch;
    justify-content: space-between;
  }
  
  .output-actions {
    grid-template-columns: 1fr 1fr;
  }
  
  .output-actions .action-btn:first-child {
    grid-column: 1 / -1;
  }
  
  .symbol-grid {
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: var(--space-sm);
  }
  
  .toast {
    left: var(--space-md);
    right: var(--space-md);
    min-width: auto;
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .logo-icon,
  .placeholder-icon {
    animation: none;
  }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
  :root {
    --theme-border-light: #000000;
    --theme-border-medium: #000000;
  }
  
  [data-theme="dark"] {
    --theme-border-light: #ffffff;
    --theme-border-medium: #ffffff;
  }
}

/* Print Styles */
@media print {
  .header,
  .footer,
  .toast,
  .loading-overlay,
  .theme-toggle,
  .output-actions {
    display: none !important;
  }
  
  .tool-card,
  .reference-card {
    box-shadow: none;
    border: 1px solid #000;
  }
  
  body {
    background: white;
    color: black;
  }
}