body {
  /* 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);
  /* Limit transitions to color properties to avoid scroll jank */
  transition: background-color var(--duration-normal) var(--ease-standard),
              color var(--duration-normal) var(--ease-standard);
  --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);
  }
/* Reduce vertical spacing now that insights section is removed */
.results-section { padding-top: var(--space-16); padding-bottom: var(--space-24); }


/* 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 */
/* NetVelo - Liquid Glass Design System */

/* CSS Custom Properties for Light/Dark Themes */
:root {
  /* Light theme variables */
  --bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  --glass-bg: rgba(255, 255, 255, 0.25);
  --glass-bg-strong: rgba(255, 255, 255, 0.35);
  --glass-border: rgba(255, 255, 255, 0.2);
  --glass-border-strong: rgba(255, 255, 255, 0.3);
  --text-primary: #1d1d1f;
  --text-secondary: #86868b;
  --text-tertiary: #98989d;
  --accent-color: #007aff;
  --accent-hover: #0056b3;
  --success-color: #34c759;
  --warning-color: #ff9500;
  --error-color: #ff3b30;
  --shadow-light: rgba(0, 0, 0, 0.1);
  --shadow-medium: rgba(0, 0, 0, 0.15);
  --shadow-heavy: rgba(0, 0, 0, 0.25);
}

[data-theme="dark"] {
  /* Dark theme variables */
  --bg-gradient: linear-gradient(135deg, #0c0c0c 0%, #1a1a1a 100%);
  --glass-bg: rgba(255, 255, 255, 0.1);
  --glass-bg-strong: rgba(255, 255, 255, 0.15);
  --glass-border: rgba(255, 255, 255, 0.15);
  --glass-border-strong: rgba(255, 255, 255, 0.25);
  --text-primary: #f2f2f7;
  --text-secondary: #8e8e93;
  --text-tertiary: #636366;
  --accent-color: #0a84ff;
  --accent-hover: #409cff;
  --success-color: #30d158;
  --warning-color: #ff9f0a;
  --error-color: #ff453a;
  --shadow-light: rgba(0, 0, 0, 0.3);
  --shadow-medium: rgba(0, 0, 0, 0.5);
  --shadow-heavy: rgba(0, 0, 0, 0.7);
}

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

body {
  font-family: var(--font-family-base);
  background: var(--bg-gradient);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color var(--duration-normal) var(--ease-standard), color var(--duration-normal) var(--ease-standard);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Universal Glass Effect */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  box-shadow: 0 8px 32px var(--shadow-light);
  transition: all 220ms var(--ease-standard);
}

.glass:hover {
  background: var(--glass-bg-strong);
  border-color: var(--glass-border-strong);
  box-shadow: 0 10px 28px var(--shadow-medium);
  transform: none;
}

.glass:active {
  transform: translateY(0px) scale(0.99);
}

.app-container {
  min-height: 100vh;
  position: relative;
  /* Allow native dropdowns/overlays to escape container */
  overflow-x: hidden;
  overflow-y: visible;
}

/* Header Section */
.header-section {
  position: fixed;
  top: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  width: min(1160px, 98vw);
  margin: 0; /* fixed element, centered */
  padding: var(--space-8) var(--space-12);
  z-index: 10;
}

/* Ensure hover does not move header horizontally; only scale subtly */
/* Remove hover scaling to avoid jitter */
.header-section:hover { transform: translateX(-50%); }

.header-content {
  max-width: 100%;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr; /* left spacer, true center, right column */
  align-items: center;
}

.header-info { grid-column: 2; justify-self: center; text-align: center; }

.header-controls { grid-column: 3; justify-self: end; display: flex; gap: var(--space-8); }

.header-spacer { grid-column: 1; }

.app-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-2);
  background: linear-gradient(45deg, var(--accent-color), var(--success-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: var(--letter-spacing-tight);
}

.app-subtitle { display: none; }

.header-controls { display: flex; gap: var(--space-8); justify-self: end; }

.control-btn {
  width: 32px;
  height: 32px;
  border: none;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--text-primary);
}

.control-btn:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

/* Main Section */
.main-section {
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 96px var(--space-16) var(--space-16); /* reduce bottom padding to tighten layout */
  display: flex;
  flex-direction: column;
  gap: var(--space-16); /* reduce vertical gaps between sections */
}

/* Speedometer Section */
.speedometer-section {
  padding: var(--space-32);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--space-32);
  align-items: center;
  justify-items: center;
  min-height: 450px;
}

.speedometer-container {
  display: flex;
  justify-content: center;
  width: 100%;
}

.speedometer {
  position: relative;
  width: 320px;
  height: 320px;
  flex-shrink: 0;
}

.speedometer-glass {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  position: relative;
  overflow: hidden;
}

.speedometer-svg, .gauge-svg {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
}

.speedometer-bg {
  stroke: var(--glass-border);
  opacity: 0.3;
  stroke-linecap: round;
}

.speed-arc {
  stroke-linecap: round;
  opacity: 0.8;
  transition: opacity var(--duration-normal) ease;
}

.speed-arc.speed-poor { stroke: var(--error-color); }
.speed-arc.speed-fair { stroke: var(--warning-color); }
.speed-arc.speed-good { stroke: var(--color-bg-2); }
.speed-arc.speed-very-good { stroke: var(--success-color); }
.speed-arc.speed-excellent { stroke: var(--accent-color); }

.speed-marks line {
  stroke: var(--text-secondary);
  opacity: 0.6;
}

.speed-label {
  fill: var(--text-secondary);
  font-size: 12px;
  font-weight: var(--font-weight-semibold);
}

/* Simple gauge styles */
.gauge-track,
.gauge-fill {
  fill: none;
  stroke-width: 10; /* thinner so it hugs the rim neatly */
  stroke-linecap: round;
}

.gauge-track {
  stroke: var(--glass-border);
  opacity: 0.4;
}

.gauge-fill {
  stroke: var(--accent-color);
  /* path length for r=145 semicircle ≈ π*r ≈ 455 */
  stroke-dasharray: 455;
  stroke-dashoffset: 455; /* 0% filled */
  transition: stroke-dashoffset 500ms var(--ease-standard), stroke 220ms var(--ease-standard);
}

.gauge-download { stroke: var(--accent-color); }
.gauge-upload { stroke: var(--success-color); }

.speedometer-display {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  z-index: 10;
}

.speed-value {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.speed-number {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--text-primary);
  transition: all var(--duration-normal) ease;
  font-variant-numeric: tabular-nums;
}

.speed-unit {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  font-weight: var(--font-weight-semibold);
}

.speed-label-text {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
  text-transform: uppercase;
  letter-spacing: 1.5px;
}

.speed-quality {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--text-secondary);
  padding: var(--space-4) var(--space-12);
  background: var(--glass-bg);
  border-radius: var(--radius-full);
  border: 1px solid var(--glass-border);
  transition: all var(--duration-normal) ease;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  backdrop-filter: blur(10px);
}

/* Test Control */
.test-control-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-16);
  position: relative;
  z-index: 5;
}

.test-button-wrapper {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-16);
}

.test-button {
  width: 140px;
  height: 140px;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: all var(--duration-normal) var(--ease-standard);
  background: var(--glass-bg-strong);
  backdrop-filter: blur(20px);
  border: 2px solid var(--glass-border-strong);
}

.test-button:hover {
  transform: scale(1.05);
  box-shadow: 0 15px 45px var(--shadow-medium);
}

.test-button:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 4px;
}

.test-button.testing {
  animation: testing-pulse 2s infinite ease-in-out;
  border-color: var(--warning-color);
}

@keyframes testing-pulse {
  0%, 100% {
    box-shadow: 0 8px 32px var(--shadow-light);
  }
  50% {
    box-shadow: 0 0 0 20px rgba(255, 149, 0, 0.2);
  }
}

.button-content {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
}

.button-text {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.test-progress {
  opacity: 0;
  transition: opacity var(--duration-normal) ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-12);
}

.test-progress.active {
  opacity: 1;
}

.progress-ring {
  position: relative;
  width: 100px;
  height: 100px;
}

.progress-svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.progress-bg, .progress-fill {
  fill: none;
  stroke-width: 4;
}

.progress-bg {
  stroke: var(--glass-border);
  opacity: 0.3;
}

.progress-fill {
  stroke: var(--accent-color);
  stroke-linecap: round;
  stroke-dasharray: 314;
  stroke-dashoffset: 314;
  transition: stroke-dashoffset 0.35s var(--ease-standard);
}

.progress-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
}

.test-status {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  text-align: center;
  font-weight: var(--font-weight-medium);
}

/* Chart Section */
.chart-container {
  padding: var(--space-24); /* slightly tighter */
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-16);
  flex-wrap: wrap;
  gap: var(--space-16);
}

.chart-header h3 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
}

.chart-legend {
  display: flex;
  gap: var(--space-24);
  flex-wrap: wrap;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.legend-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.download-legend .legend-dot { background: var(--accent-color); }
.upload-legend .legend-dot { background: var(--success-color); }
.ping-legend .legend-dot { background: var(--warning-color); }

.legend-text {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  font-weight: var(--font-weight-semibold);
}

/* Insights Section */
.insights-section {
  padding: var(--space-32);
  opacity: 0;
  visibility: hidden;
  transform: translateY(30px);
  transition: all 0.8s var(--ease-standard);
}

.insights-section.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.insights-section h3 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  text-align: center;
  margin-bottom: var(--space-32);
}

.insights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-20);
}

.insight-card {
  background: var(--glass-bg);
  backdrop-filter: blur(15px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-24);
  text-align: center;
  transition: all var(--duration-normal) ease;
}

.insight-card:hover {
  background: var(--glass-bg-strong);
  transform: translateY(-5px);
  box-shadow: 0 15px 45px var(--shadow-medium);
}

.insight-icon {
  font-size: 32px;
  margin-bottom: var(--space-12);
}

.insight-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-8);
}

.insight-description {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-16);
}

.insight-value {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--accent-color);
}

/* Server Results Section */
.server-results-section { display: none; padding: var(--space-24); opacity: 0; visibility: hidden; transform: translateY(8px); transition: opacity 220ms var(--ease-standard), transform 220ms var(--ease-standard); }

.server-results-section.visible { display: block; opacity: 1; visibility: visible; transform: translateY(0); }

.server-results-section h3 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  text-align: center;
  margin-bottom: var(--space-32);
}

.server-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-20);
  margin-bottom: var(--space-32);
}

.server-card {
  background: var(--glass-bg);
  backdrop-filter: blur(15px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-24);
  transition: all var(--duration-normal) ease;
}

.server-card:hover {
  background: var(--glass-bg-strong);
  transform: translateY(-3px);
  box-shadow: 0 12px 40px var(--shadow-medium);
}

.server-card.excellent { border-color: var(--success-color); }
.server-card.good { border-color: var(--warning-color); }
.server-card.fair { border-color: var(--text-secondary); }
.server-card.poor { border-color: var(--error-color); }
/* Ensure all completed servers share a uniform golden border for consistency */
.server-card.completed { border-color: var(--warning-color); }

/* Server header with badges */
.server-header { display: flex; align-items: center; justify-content: space-between; gap: var(--space-8); margin-bottom: var(--space-4); }
.server-badges { display: flex; gap: var(--space-8); align-items: center; }
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  position: relative;
}
.badge--measured { background: rgba(52, 199, 89, 0.18); border-color: rgba(52, 199, 89, 0.4); color: var(--text-primary); }
.badge--simulated { background: rgba(255, 149, 0, 0.18); border-color: rgba(255, 149, 0, 0.4); color: var(--text-primary); }

/* Tooltip */
.badge .tooltip {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 8px);
  transform: translateX(-50%);
  white-space: normal;
  width: 260px;
  background: var(--color-surface, #111);
  color: var(--text-primary);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  box-shadow: 0 12px 32px var(--shadow-medium);
  padding: 10px 12px;
  font-size: 12px;
  line-height: 1.35;
  display: none;
  z-index: 1500;
}
.badge:hover .tooltip { display: block; }
.badge .tooltip strong { display: block; margin-bottom: 4px; }

/* Dark mode tooltip surface alignment */
[data-theme="dark"] .badge .tooltip { background: #0f1216; border-color: rgba(255,255,255,0.12); color: #e6e9ef; }

.server-name {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

.server-location {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-16);
}

.server-metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
}

.server-metric {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: var(--space-12);
  text-align: center;
}

.metric-label {
  font-size: var(--font-size-xs);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
  font-weight: var(--font-weight-semibold);
}

.metric-value {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
}

.server-summary {
  background: var(--glass-bg);
  backdrop-filter: blur(15px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  scrollbar-gutter: stable both-edges; /* prevent width shift when scrollbar appears */
  overscroll-behavior: contain; /* stop scroll chaining to page */
  padding: var(--space-24);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-16);
}

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

.summary-label {
  font-size: var(--font-size-sm);
  color: var(--text-primary);
  display: block;
  margin-bottom: var(--space-4);
  font-weight: var(--font-weight-medium);
}

.summary-value {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
}

/* Results Section */
.results-section { display: none; padding: var(--space-24); opacity: 0; visibility: hidden; transform: translateY(8px); transition: opacity 220ms var(--ease-standard), transform 220ms var(--ease-standard); }

.results-section.visible { display: block; opacity: 1; visibility: visible; transform: translateY(0); }

.results-section h3 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  text-align: center;
  margin-bottom: var(--space-20);
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-12);
  margin-bottom: var(--space-24);
}

.metric-card {
  background: var(--glass-bg);
  backdrop-filter: blur(15px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-20);
  display: flex;
  align-items: center;
  gap: var(--space-16);
  transition: all var(--duration-normal) ease;
}

.metric-card:hover {
  background: var(--glass-bg-strong);
  transform: translateY(-3px);
  box-shadow: 0 12px 40px var(--shadow-medium);
}

.metric-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: var(--font-weight-bold);
  flex-shrink: 0;
}

.download-icon {
  background: var(--color-bg-1);
  color: var(--accent-color);
}

.upload-icon {
  background: var(--color-bg-3);
  color: var(--success-color);
}

.ping-icon {
  background: var(--color-bg-2);
  color: var(--warning-color);
}

.jitter-icon {
  background: var(--color-bg-5);
  color: var(--text-secondary);
}

.metric-content {
  flex: 1;
}

.metric-label {
  font-size: var(--font-size-xs);
  color: var(--text-primary);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--space-4);
}

.metric-value {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

.metric-quality {
  font-size: var(--font-size-xs);
  padding: var(--space-2) var(--space-8);
  border-radius: var(--radius-sm);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  backdrop-filter: blur(10px);
}

/* Analysis and Examples Sections */
.network-analysis-section { margin-bottom: var(--space-24); }

.network-analysis-section h4 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-16);
  text-align: center;
}

.analysis-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: var(--space-12); }

.analysis-card {
  background: var(--glass-bg);
  backdrop-filter: blur(15px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: var(--space-20);
  text-align: center;
  transition: all var(--duration-normal) ease;
}

.analysis-card:hover {
  background: var(--glass-bg-strong);
  transform: translateY(-3px);
  box-shadow: 0 12px 40px var(--shadow-medium);
}

.analysis-title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-8);
}

.analysis-value {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--accent-color);
  margin-bottom: var(--space-4);
}

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

.examples-section h4 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-12);
  text-align: center;
}

.examples-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: var(--space-12); }

.example-card {
  background: var(--glass-bg);
  backdrop-filter: blur(15px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: var(--space-20);
  text-align: center;
  transition: all var(--duration-normal) ease;
}

.example-card:hover {
  background: var(--glass-bg-strong);
  transform: translateY(-3px);
  box-shadow: 0 12px 40px var(--shadow-medium);
}

.example-title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-8);
}

.example-time {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--accent-color);
  margin-bottom: var(--space-4);
}

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

/* Settings Panel */
.settings-panel {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%); /* fixed center, no scaling to prevent jitter */
  width: min(560px, 92vw);
  max-height: 85vh;
  z-index: 1100;
  transition: opacity var(--duration-normal) var(--ease-standard); /* only fade, no transform animation */
  overflow: visible; /* prevent clipping of dropdowns */
  overflow-y: auto;
  padding: var(--space-24);
  background: #ffffff; /* solid base */
  border: 1px solid #e5e7eb;
  border-radius: 18px;
  color: #0f172a; /* strong readable text */
  backdrop-filter: none; /* disable glass blur on modal */
  -webkit-backdrop-filter: none;
  opacity: 0;
  visibility: hidden; /* do not capture clicks when closed */
  pointer-events: none; /* do not block page interactions when closed */
    display: none; /* fully remove when closed */
  }

/* Hint native controls to render with dark popup in dark theme */
[data-color-scheme="dark"] .settings-panel,
[data-color-scheme="dark"] .setting-select { color-scheme: dark; }
[data-color-scheme="light"] .settings-panel,
[data-color-scheme="light"] .setting-select { color-scheme: light; }

@media (prefers-color-scheme: dark) {
  .settings-panel, .setting-select { color-scheme: dark; }
}
/* Themed Custom Select (for settings) */
.custom-select { position: relative; width: 100%; }
.custom-select.is-open { z-index: 1400; }

.custom-select__button {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px;
  border-radius: 8px;
  background: #ffffff;
  border: 1px solid #e5e7eb;
  color: #0f172a;
  backdrop-filter: none;
  font-size: 15px;
}

.custom-select__button:focus-visible { outline: 2px solid var(--accent-color); outline-offset: 2px; }

.custom-select__caret { margin-left: var(--space-12); opacity: 0.8; }

.custom-select__menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  max-height: 220px;
  overflow: auto;
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  box-shadow: 0 12px 32px rgba(0,0,0,0.18);
  padding: 6px 0;
  display: none;
  backdrop-filter: none;
  z-index: 1400; /* ensure above other glass panels */
}

.custom-select.is-open .custom-select__menu { display: block; }

.custom-select__option {
  padding: 10px 14px;
  color: #0f172a; /* strong contrast */
  cursor: pointer;
  line-height: 1.5;
  font-size: 15px;
}

.custom-select__option[aria-selected="true"] { background: rgba(0, 122, 255, 0.12); }
.custom-select__option[aria-disabled="true"] { color: #9ca3af; cursor: not-allowed; }
.custom-select__option:not([aria-disabled="true"]):hover { background: rgba(0,0,0,0.06); }
[data-theme="dark"] .custom-select__menu,
[data-color-scheme="dark"] .custom-select__menu {
  border-color: rgba(255,255,255,0.18);
}

/* Dark theme overrides for dropdown readability */
[data-theme="dark"] .custom-select__button,
[data-color-scheme="dark"] .custom-select__button {
  background: #141820;
  border-color: rgba(255,255,255,0.16);
  color: #e6e9ef;
}

[data-theme="dark"] .custom-select__menu,
[data-color-scheme="dark"] .custom-select__menu {
  background: #0e1218;
  border-color: rgba(255,255,255,0.16);
}

[data-theme="dark"] .custom-select__option,
[data-color-scheme="dark"] .custom-select__option { color: #e6e9ef; }

[data-theme="dark"] .custom-select__option:not([aria-disabled="true"]):hover,
[data-color-scheme="dark"] .custom-select__option:not([aria-disabled="true"]):hover { background: rgba(255,255,255,0.10); }

/* Ensure native select is visually hidden but accessible fallback if JS fails */
.setting-select.is-enhanced {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0 0 0 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
  visibility: hidden !important;
}
.custom-select__caret { margin-left: var(--space-12); opacity: 0.8; transition: transform 120ms ease; }
.custom-select.is-open .custom-select__caret { transform: rotate(180deg); }

.settings-panel.open {
  transform: translate(-50%, -50%);
  opacity: 1;
  visibility: visible;
  pointer-events: auto; /* re-enable interactions when open */
  display: block; /* show panel when open */
}

/* Theme-aware modal panel */
[data-theme="dark"] .settings-panel { background: #0f1216; border-color: rgba(255,255,255,0.14); color: #e6e9ef; }
[data-theme="light"] .settings-panel { background: #ffffff; border-color: rgba(0,0,0,0.08); color: #111827; }

/* Setting groups inside modal: soften glass and remove blur */
[data-theme="dark"] .settings-panel .setting-group { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.12); }
[data-theme="light"] .settings-panel .setting-group { background: rgba(0,0,0,0.03); border-color: rgba(0,0,0,0.08); }
.settings-panel .setting-group { backdrop-filter: none; -webkit-backdrop-filter: none; }

/* Freeze background hover effects while modal is open */
body.modal-open .glass:hover { background: var(--glass-bg); border-color: var(--glass-border); box-shadow: 0 8px 32px var(--shadow-light); transform: none; }
body.modal-open .header-section:hover { transform: translateX(-50%); }
body.modal-open .header-section { pointer-events: none; }

/* Inside modal: remove hover transforms and transitions to avoid jitter/flicker */
.settings-panel .setting-group,
.settings-panel .custom-select__button,
.settings-panel .custom-select__menu,
.settings-panel .setting-select,
.settings-panel .slider,
.settings-panel .toggle-slider,
.settings-panel .setting-button,
.settings-panel .settings-header,
.settings-panel .close-settings {
  transition: none !important;
}
.settings-panel .setting-button { background: #f8fafc; border: 1px solid rgba(0,0,0,0.08); }
.settings-panel .setting-button:hover { background: #eef2f7; transform: none; }
[data-theme="dark"] .settings-panel .setting-button { background: #20242b; border-color: rgba(255,255,255,0.12); }
[data-theme="dark"] .settings-panel .setting-button:hover { background: #242a33; }

/* Stabilize custom select hover inside modal */
.settings-panel .custom-select__button:hover { background: #ffffff; border-color: rgba(0,0,0,0.10); }
[data-theme="dark"] .settings-panel .custom-select__button:hover { background: #141820; border-color: rgba(255,255,255,0.16); }

.settings-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-32);
  padding-bottom: var(--space-16);
  border-bottom: 1px solid var(--glass-border);
}

.settings-header h3 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: inherit; /* use theme-aware modal color */
}

.close-settings {
  width: 36px;
  height: 36px;
  border: none;
  color: inherit; /* theme-aware */
  font-size: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

.close-settings:hover {
  transform: none; /* no wobble */
  background: rgba(0,0,0,0.06);
}
[data-theme="dark"] .close-settings:hover { background: rgba(255,255,255,0.10); }

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

.setting-group {
  background: #ffffff;
  backdrop-filter: none;
  border: 1px solid rgba(0,0,0,0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-20);
  overflow: visible; /* allow dropdown menus to escape */
}
[data-theme="dark"] .setting-group { background: #151a20; border-color: rgba(255,255,255,0.12); }

.setting-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: inherit;
  margin-bottom: var(--space-12);
}

.setting-select {
  width: 100%;
  padding: var(--space-12);
  border: none;
  border-radius: var(--radius-base);
  background-color: #ffffff; /* solid for readability */
  border: 1px solid #e5e7eb;
  box-shadow: none;
  backdrop-filter: none;
  color: #0f172a;
  font-size: 15px;
  cursor: pointer;
  position: relative;
  z-index: 1200; /* above the panel to ensure dropdown is visible */
  /* Normalize native select look */
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  /* Custom caret */
  background-image: var(--select-caret-light);
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px;
  padding-right: 40px;
}

/* Prevent .glass hover transform on selects */
.setting-select.glass { transform: none; }

.setting-select:focus {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

/* Dark mode caret for settings selects */
[data-color-scheme="dark"] .setting-select {
  background-image: var(--select-caret-dark);
  background-color: #23272f; /* solid dark */
  border-color: #2a313b;
  color: #e6e9ef;
}
[data-color-scheme="light"] .setting-select {
  background-image: var(--select-caret-light);
  background-color: rgba(255, 255, 255, 0.65); /* subtle light glass */
  border-color: rgba(0,0,0,0.08);
}

/* Options list styling (where supported) */
select.setting-select option { background-color: var(--bg-color); color: var(--text-primary); }

/* Disabled state */
.setting-select:disabled {
  opacity: 0.8;
  cursor: not-allowed;
  color: var(--text-secondary);
  /* Keep themed background when disabled */
  background-color: inherit;
  border-color: inherit;
}

.setting-slider {
  position: relative;
}

.settings-panel .slider {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: rgba(0,0,0,0.08); /* clearer on light panel */
  backdrop-filter: blur(10px);
  outline: none;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}
[data-theme="dark"] .settings-panel .slider { background: rgba(255,255,255,0.12); }

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent-color);
  cursor: pointer;
  box-shadow: 0 2px 8px var(--shadow-light);
}

.slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent-color);
  cursor: pointer;
  border: none;
  box-shadow: 0 2px 8px var(--shadow-light);
}

.slider-labels {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-8);
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

.slider-value {
  text-align: center;
  margin-top: var(--space-8);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--accent-color);
}

.setting-toggle {
  display: flex;
  align-items: center;
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  cursor: pointer;
  font-size: var(--font-size-sm);
  color: var(--text-primary);
}

.toggle-input {
  display: none;
}

.toggle-slider {
  width: 44px;
  height: 24px;
  border-radius: 12px;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  position: relative;
  transition: all var(--duration-normal) ease;
  cursor: pointer;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--text-secondary);
  transition: all var(--duration-normal) ease;
}

.toggle-input:checked + .toggle-slider {
  background: var(--accent-color);
}

.toggle-input:checked + .toggle-slider::before {
  transform: translateX(20px);
  background: white;
}

.setting-button {
  width: 100%;
  padding: var(--space-12) var(--space-20);
  border: none;
  border-radius: var(--radius-base);
  background: var(--glass-bg);
  backdrop-filter: blur(15px);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: all var(--duration-normal) ease;
}

.setting-button:hover {
  background: var(--glass-bg-strong);
  transform: translateY(-2px);
}

.settings-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.45); /* remove backdrop blur to prevent layout/hover jitter */
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal) ease;
  pointer-events: none; /* don't block page when closed */
  display: none; /* fully remove when closed */
}

.settings-overlay.active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto; /* enable interactions only when active */
  display: block; /* show when active */
}

/* Quality Classes */
.quality-excellent {
  background: rgba(52, 199, 89, 0.2);
  color: var(--success-color);
  border: 1px solid var(--success-color);
}

.quality-good {
  background: rgba(255, 149, 0, 0.2);
  color: var(--warning-color);
  border: 1px solid var(--warning-color);
}

.quality-fair {
  background: rgba(142, 142, 147, 0.2);
  color: var(--text-secondary);
  border: 1px solid var(--text-secondary);
}

.quality-poor {
  background: rgba(255, 59, 48, 0.2);
  color: var(--error-color);
  border: 1px solid var(--error-color);
}

/* Testing Animation States */
.speedometer.testing .speedometer-glass {
  animation: testing-pulse-speedometer 2s infinite ease-in-out;
}

@keyframes testing-pulse-speedometer {
  0%, 100% {
    box-shadow: 0 8px 32px var(--shadow-light);
  }
  50% {
    box-shadow: 0 0 40px var(--accent-color);
  }
}

.speedometer.testing .speed-number {
  color: var(--accent-color);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .speedometer-section {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
    gap: var(--space-24);
    text-align: center;
  }
  
  .speedometer {
    width: 280px;
    height: 280px;
  }
  
  .speed-number {
    font-size: var(--font-size-3xl);
  }

  .download-speedometer { order: 1; }
  .test-control-container { order: 2; }
  .upload-speedometer { order: 3; }

  .chart-header {
    flex-direction: column;
    text-align: center;
  }

  .chart-legend {
    justify-content: center;
  }
}

@media (max-width: 768px) {
  .header-content { grid-template-columns: 1fr auto 1fr; gap: var(--space-8); }
  .header-section { top: var(--space-8); width: min(640px, 96vw); }
  
  .speedometer {
    width: 250px;
    height: 250px;
  }
  
  .speed-number {
    font-size: var(--font-size-2xl);
  }
  
  .test-button {
    width: 120px;
    height: 120px;
  }
  
  .results-grid {
    grid-template-columns: 1fr;
  }
  
  .settings-panel {
    width: 100vw;
    right: -100vw;
  }

  .chart-legend {
    flex-direction: column;
    gap: var(--space-8);
  }
}

@media (max-width: 480px) {
  .main-section { padding: 76px var(--space-12) var(--space-24); }
  
  .speedometer {
    width: 220px;
    height: 220px;
  }
  
  .speed-number {
    font-size: var(--font-size-xl);
  }
  
  .examples-grid, .analysis-grid, .insights-grid, .server-grid {
    grid-template-columns: 1fr;
  }

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

  .speedometer-section {
    gap: var(--space-16);
    padding: var(--space-20);
  }

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

  .header-section { padding: var(--space-8) var(--space-12); }
}

/* Reduce vertical spacing now that insights section is removed */
.results-section { padding-top: var(--space-12); padding-bottom: var(--space-20); }
}