:root {
  --color-background: #F7F6F2;
  --color-surface: #FFFFFF;
  --color-surface-alt: #E8EBEF;
  --color-text-primary: #1C1F24;
  --color-text-secondary: #5A616B;
  --color-nav-bg: #1B2A4A;
  --color-nav-text: #F7F6F2;
  --color-accent-lime: #B8E62E;
  --color-accent-orange: #F26B1D;
  --color-accent-orange-hover: #D95A12;
  --color-accent-violet: #8B7BB8;
  --color-border: #D6DAE0;
  --color-focus: #F26B1D;

  --font-heading: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  --text-display-size: clamp(2rem, 4vw, 3rem);
  --text-display-line-height: 1.1;
  --text-display-weight: 700;
  --text-display-letter-spacing: -0.02em;

  --text-h1-size: clamp(1.75rem, 3.2vw, 2.25rem);
  --text-h1-line-height: 1.15;
  --text-h1-weight: 700;
  --text-h1-letter-spacing: -0.01em;

  --text-h2-size: clamp(1.5rem, 2.6vw, 1.75rem);
  --text-h2-line-height: 1.2;
  --text-h2-weight: 700;
  --text-h2-letter-spacing: -0.01em;

  --text-h3-size: 1.375rem;
  --text-h3-line-height: 1.25;
  --text-h3-weight: 600;
  --text-h3-letter-spacing: 0;

  --text-h4-size: 1.125rem;
  --text-h4-line-height: 1.3;
  --text-h4-weight: 600;
  --text-h4-letter-spacing: 0;

  --text-body-large-size: 1.125rem;
  --text-body-large-line-height: 1.6;
  --text-body-large-weight: 400;
  --text-body-large-letter-spacing: 0;

  --text-body-size: 1rem;
  --text-body-line-height: 1.6;
  --text-body-weight: 400;
  --text-body-letter-spacing: 0;

  --text-body-small-size: 0.875rem;
  --text-body-small-line-height: 1.5;
  --text-body-small-weight: 400;
  --text-body-small-letter-spacing: 0;

  --text-caption-size: 0.75rem;
  --text-caption-line-height: 1.4;
  --text-caption-weight: 500;
  --text-caption-letter-spacing: 0.02em;

  --text-overline-size: 0.6875rem;
  --text-overline-line-height: 1.3;
  --text-overline-weight: 600;
  --text-overline-letter-spacing: 0.08em;
  --text-overline-transform: uppercase;

  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  --container-max: 80rem;
  --container-padding: 1.5rem;
  --article-max: 45rem;
  --sidebar-width: 20rem;

  --radius-small: 0.25rem;
  --radius-medium: 0.5rem;
  --radius-large: 0.75rem;
  --radius-pill: 999px;

  --border-default: 1px solid var(--color-border);
  --border-focus: 2px solid var(--color-focus);
  --focus-offset: 2px;

  --transition-fast: 150ms ease;
  --transition-medium: 300ms ease-out;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-body-size);
  font-weight: var(--text-body-weight);
  line-height: var(--text-body-line-height);
  letter-spacing: var(--text-body-letter-spacing);
  color: var(--color-text-primary);
  background-color: var(--color-background);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

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

a:hover {
  color: var(--color-accent-orange);
}

ul,
ol {
  list-style: none;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
  width: 100%;
}

blockquote,
q {
  quotes: none;
}

blockquote::before,
blockquote::after,
q::before,
q::after {
  content: "";
  content: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  color: var(--color-text-primary);
  text-wrap: balance;
}

h1 {
  font-size: var(--text-h1-size);
  line-height: var(--text-h1-line-height);
  font-weight: var(--text-h1-weight);
  letter-spacing: var(--text-h1-letter-spacing);
  margin-block-end: var(--space-lg);
}

h2 {
  font-size: var(--text-h2-size);
  line-height: var(--text-h2-line-height);
  font-weight: var(--text-h2-weight);
  letter-spacing: var(--text-h2-letter-spacing);
  margin-block-end: var(--space-md);
}

h3 {
  font-size: var(--text-h3-size);
  line-height: var(--text-h3-line-height);
  font-weight: var(--text-h3-weight);
  letter-spacing: var(--text-h3-letter-spacing);
  margin-block-end: var(--space-sm);
}

h4 {
  font-size: var(--text-h4-size);
  line-height: var(--text-h4-line-height);
  font-weight: var(--text-h4-weight);
  letter-spacing: var(--text-h4-letter-spacing);
  margin-block-end: var(--space-xs);
}

p {
  font-size: var(--text-body-size);
  line-height: var(--text-body-line-height);
  font-weight: var(--text-body-weight);
  letter-spacing: var(--text-body-letter-spacing);
  color: var(--color-text-primary);
  margin-block-end: var(--space-md);
}

blockquote {
  margin-block-end: var(--space-md);
  padding-inline-start: var(--space-lg);
  border-inline-start: 3px solid var(--color-accent-orange);
  color: var(--color-text-secondary);
  font-style: italic;
}

ul,
ol {
  margin-block-end: var(--space-md);
  padding-inline-start: var(--space-lg);
}

ul {
  list-style-type: disc;
}

ol {
  list-style-type: decimal;
}

li {
  font-size: var(--text-body-size);
  line-height: var(--text-body-line-height);
  color: var(--color-text-primary);
}

li > ul,
li > ol {
  margin-block-end: 0;
  margin-block-start: var(--space-xs);
}

figure {
  margin-block-end: var(--space-md);
}

figcaption {
  font-size: var(--text-caption-size);
  line-height: var(--text-caption-line-height);
  font-weight: var(--text-caption-weight);
  letter-spacing: var(--text-caption-letter-spacing);
  color: var(--color-text-secondary);
  margin-block-start: var(--space-xs);
}

hr {
  border: none;
  border-block-start: var(--border-default);
  margin-block: var(--space-lg);
}

code,
pre,
kbd,
samp {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.9em;
}

pre {
  background-color: var(--color-surface-alt);
  border: var(--border-default);
  border-radius: var(--radius-medium);
  padding: var(--space-md);
  overflow-x: auto;
  margin-block-end: var(--space-md);
}

code {
  background-color: var(--color-surface-alt);
  border-radius: var(--radius-small);
  padding: 0.125rem 0.375rem;
}

pre code {
  background: none;
  padding: 0;
  border-radius: 0;
}

strong,
b {
  font-weight: 700;
}

em,
i {
  font-style: italic;
}

small {
  font-size: var(--text-body-small-size);
  line-height: var(--text-body-small-line-height);
}

mark {
  background-color: var(--color-accent-lime);
  color: var(--color-text-primary);
  padding: 0.125rem 0.25rem;
  border-radius: var(--radius-small);
}

abbr[title] {
  text-decoration: underline dotted;
  cursor: help;
}

address {
  font-style: normal;
  color: var(--color-text-secondary);
  margin-block-end: var(--space-md);
}

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

::selection {
  background-color: var(--color-accent-lime);
  color: var(--color-text-primary);
}

::-moz-selection {
  background-color: var(--color-accent-lime);
  color: var(--color-text-primary);
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.article-container {
  width: 100%;
  max-width: var(--article-max);
  margin-inline: auto;
}

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

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  z-index: 1000;
  background-color: var(--color-accent-orange);
  color: var(--color-surface);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-medium);
  font-size: var(--text-body-small-size);
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-md);
  color: var(--color-surface);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  border-radius: var(--radius-medium);
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--text-overline-size);
  font-weight: var(--text-overline-weight);
  letter-spacing: var(--text-overline-letter-spacing);
  text-transform: var(--text-overline-transform);
  line-height: 1.3;
  min-height: 2.75rem;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast),
    opacity var(--transition-fast);
  border: 1px solid transparent;
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.btn:active {
  border-style: inset;
  border-width: 1px;
}

.btn-primary {
  background-color: var(--color-accent-orange);
  color: var(--color-surface);
}

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

.btn-secondary {
  background-color: transparent;
  color: var(--color-nav-bg);
  border-color: var(--color-nav-bg);
}

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

.btn-tertiary {
  background-color: transparent;
  color: var(--color-text-primary);
  padding-inline: var(--space-xs);
}

.btn-tertiary:hover {
  color: var(--color-accent-orange);
}

.tag {
  display: inline-flex;
  align-items: center;
  border-radius: var(--radius-small);
  background-color: var(--color-surface-alt);
  color: var(--color-text-secondary);
  font-size: var(--text-caption-size);
  font-weight: var(--text-caption-weight);
  letter-spacing: var(--text-caption-letter-spacing);
  line-height: var(--text-caption-line-height);
  padding: var(--space-2xs) var(--space-xs);
}

.platform-filter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2rem;
  padding: 0 var(--space-md);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-alt);
  color: var(--color-text-secondary);
  font-size: var(--text-caption-size);
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.4;
  border: 1px solid transparent;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast);
  cursor: pointer;
}

.platform-filter:hover {
  color: var(--color-text-primary);
  border-color: var(--color-border);
}

.platform-filter.is-active {
  background-color: var(--color-accent-lime);
  color: var(--color-text-primary);
  border-color: var(--color-accent-lime);
}

.card {
  background-color: var(--color-surface);
  border: var(--border-default);
  border-radius: var(--radius-medium);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.card:hover {
  border-color: var(--color-nav-bg);
}

.card > :last-child {
  margin-block-end: 0;
}

.card-body {
  padding: var(--space-md);
}

.card-body > :last-child {
  margin-block-end: 0;
}

.overline {
  font-size: var(--text-overline-size);
  font-weight: var(--text-overline-weight);
  letter-spacing: var(--text-overline-letter-spacing);
  text-transform: var(--text-overline-transform);
  line-height: var(--text-overline-line-height);
  color: var(--color-text-secondary);
  display: block;
  margin-block-end: var(--space-xs);
}

.caption {
  font-size: var(--text-caption-size);
  font-weight: var(--text-caption-weight);
  letter-spacing: var(--text-caption-letter-spacing);
  line-height: var(--text-caption-line-height);
  color: var(--color-text-secondary);
}

.progress-track {
  width: 100%;
  height: 0.25rem;
  background-color: var(--color-surface-alt);
  border-radius: var(--radius-pill);
  overflow: hidden;
  position: relative;
}

.progress-fill {
  height: 100%;
  background-color: var(--color-accent-lime);
  border-radius: var(--radius-pill);
  width: 0;
  transition: width var(--transition-medium);
}

.checkpoint-dot {
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background-color: var(--color-accent-lime);
  border: 2px solid var(--color-surface);
  display: inline-block;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.checkpoint-dot:hover {
  transform: scale(1.25);
}

.score-panel {
  background-color: var(--color-accent-violet);
  border-radius: var(--radius-medium);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  text-align: center;
}

.score-panel .score-number {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-surface);
}

.score-panel .score-verdict {
  font-size: var(--text-body-small-size);
  font-weight: 600;
  line-height: 1.5;
  color: var(--color-surface);
}

.input {
  width: 100%;
  min-height: 3rem;
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-surface);
  border: var(--border-default);
  border-radius: var(--radius-medium);
  font-size: var(--text-body-size);
  font-weight: var(--text-body-weight);
  line-height: var(--text-body-line-height);
  color: var(--color-text-primary);
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

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

.input:focus {
  outline: none;
  border-color: var(--color-focus);
  box-shadow: 0 0 0 2px var(--color-focus);
}

textarea.input {
  min-height: 8rem;
  resize: vertical;
}

select.input {
  appearance: auto;
  -webkit-appearance: auto;
  cursor: pointer;
}

label {
  display: block;
  font-size: var(--text-body-small-size);
  font-weight: 600;
  line-height: var(--text-body-small-line-height);
  color: var(--color-text-primary);
  margin-block-end: var(--space-2xs);
}

.form-group {
  margin-block-end: var(--space-md);
}

.form-group > :last-child {
  margin-block-end: 0;
}

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: var(--space-xs);
}

.checkbox-group input[type="checkbox"] {
  width: 1.125rem;
  height: 1.125rem;
  margin-block-start: 0.125rem;
  flex-shrink: 0;
  accent-color: var(--color-accent-orange);
  cursor: pointer;
}

.checkbox-group label {
  margin-block-end: 0;
  font-weight: 400;
  cursor: pointer;
}

.breadcrumbs {
  font-size: var(--text-caption-size);
  font-weight: var(--text-caption-weight);
  letter-spacing: var(--text-caption-letter-spacing);
  line-height: var(--text-caption-line-height);
  color: var(--color-text-secondary);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2xs);
  margin-block-end: var(--space-md);
}

.breadcrumbs a {
  color: var(--color-text-secondary);
}

.breadcrumbs a:hover {
  color: var(--color-accent-orange);
}

.breadcrumbs .separator {
  color: var(--color-text-secondary);
  user-select: none;
}

.timeline {
  position: relative;
  padding-inline-start: var(--space-lg);
  border-inline-start: 2px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.timeline-item {
  position: relative;
  padding-block-end: var(--space-md);
}

.timeline-item:last-child {
  padding-block-end: 0;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--space-lg) - 0.375rem);
  top: 0.25rem;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background-color: var(--color-accent-lime);
  border: 2px solid var(--color-surface);
}

.timeline-item > :last-child {
  margin-block-end: 0;
}

.flex {
  display: flex;
  gap: var(--space-md);
}

.flex > * {
  min-width: 0;
}

.flex-wrap {
  flex-wrap: wrap;
}

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

.flex-align-center {
  align-items: center;
}

.flex-align-start {
  align-items: flex-start;
}

.flex-align-end {
  align-items: flex-end;
}

.flex-justify-center {
  justify-content: center;
}

.flex-justify-between {
  justify-content: space-between;
}

.flex-justify-end {
  justify-content: flex-end;
}

.flex-gap-xs {
  gap: var(--space-xs);
}

.flex-gap-sm {
  gap: var(--space-sm);
}

.flex-gap-lg {
  gap: var(--space-lg);
}

.flex-gap-xl {
  gap: var(--space-xl);
}

.flex-gap-2xl {
  gap: var(--space-2xl);
}

.flex-grow {
  flex-grow: 1;
}

.flex-shrink-0 {
  flex-shrink: 0;
}

.mt-2xs { margin-block-start: var(--space-2xs); }
.mt-xs { margin-block-start: var(--space-xs); }
.mt-sm { margin-block-start: var(--space-sm); }
.mt-md { margin-block-start: var(--space-md); }
.mt-lg { margin-block-start: var(--space-lg); }
.mt-xl { margin-block-start: var(--space-xl); }
.mt-2xl { margin-block-start: var(--space-2xl); }
.mt-3xl { margin-block-start: var(--space-3xl); }

.mb-2xs { margin-block-end: var(--space-2xs); }
.mb-xs { margin-block-end: var(--space-xs); }
.mb-sm { margin-block-end: var(--space-sm); }
.mb-md { margin-block-end: var(--space-md); }
.mb-lg { margin-block-end: var(--space-lg); }
.mb-xl { margin-block-end: var(--space-xl); }
.mb-2xl { margin-block-end: var(--space-2xl); }
.mb-3xl { margin-block-end: var(--space-3xl); }

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

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

.text-start {
  text-align: start;
}

.text-end {
  text-align: end;
}

@media (max-width: 767px) {
  :root {
    --container-padding: 1rem;
    --text-display-size: 2rem;
    --text-h1-size: 1.75rem;
    --text-h2-size: 1.5rem;
  }

  .flex {
    gap: var(--space-sm);
  }

  .flex-gap-lg {
    gap: var(--space-md);
  }

  .flex-gap-xl {
    gap: var(--space-lg);
  }

  .flex-gap-2xl {
    gap: var(--space-xl);
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  :root {
    --container-padding: 1.5rem;
    --text-display-size: 2.5rem;
    --text-h1-size: 2rem;
    --text-h2-size: 1.625rem;
  }
}