:root {
  --gray-900: #171717;
  --gray-800: #262626;
  --gray-700: #404040;
  --gray-600: #525252;
  --gray-500: #737373;
  --gray-400: #a3a3a3;
  --gray-300: #d4d4d4;
  --gray-200: #e5e5e5;
  --gray-100: #f5f5f5;
  --gray-50: #fafafa;
  --amber-600: #b45309;
  --amber-500: #f59e0b;
  --amber-400: #fbbf24;

  --color-text: var(--gray-900);
  --color-text-muted: var(--gray-600);
  --color-surface: #ffffff;
  --color-surface-muted: var(--gray-50);
  --color-border: var(--gray-300);
  --color-focus: var(--amber-600);

  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: clamp(1.25rem, 1.1rem + 0.6vw, 1.5rem);
  --text-2xl: clamp(1.75rem, 1.35rem + 1.6vw, 2.5rem);
  --text-3xl: clamp(2.25rem, 1.6rem + 2.6vw, 3.75rem);
  --leading-tight: 1.15;
  --leading-normal: 1.6;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1.25rem;
  --shadow-sm: 0 1px 2px rgb(23 23 23 / 8%);
  --shadow-md: 0 12px 30px rgb(23 23 23 / 10%);
  --transition: 180ms ease;
}

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

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

body {
  min-width: 320px;
  margin: 0;
  color: var(--color-text);
  background: var(--color-surface);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  -webkit-font-smoothing: antialiased;
}

body.menu-open {
  overflow: hidden;
}

h1,
h2,
h3,
p,
ul,
ol {
  margin-top: 0;
}

h1,
h2,
h3 {
  line-height: var(--leading-tight);
  text-wrap: balance;
}

h1 {
  font-size: var(--text-3xl);
}

h2 {
  font-size: var(--text-2xl);
}

h3 {
  font-size: var(--text-xl);
}

a {
  color: inherit;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

img,
svg {
  display: block;
  max-width: 100%;
}

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

button {
  cursor: pointer;
}

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

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

.btn {
  display: inline-flex;
  min-height: 2.875rem;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.7rem 1.125rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  transition: background-color var(--transition), border-color var(--transition), color var(--transition), transform var(--transition);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.65;
  transform: none;
}

.btn-primary {
  color: var(--gray-900);
  background: var(--amber-500);
  border-color: var(--amber-500);
}

.btn-primary:hover {
  background: var(--amber-400);
  border-color: var(--amber-400);
}

.btn-secondary {
  color: var(--gray-900);
  background: transparent;
  border-color: var(--gray-700);
}

.btn-secondary:hover {
  color: #ffffff;
  background: var(--gray-800);
  border-color: var(--gray-800);
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: 0;
  margin: 0;
  list-style: none;
}

.tag,
.chip {
  display: inline-flex;
  align-items: center;
  min-height: 2rem;
  padding: var(--space-1) var(--space-3);
  color: var(--gray-800);
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  border-radius: 999px;
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1.25;
}

.tag-accent,
.chip-accent {
  color: var(--gray-900);
  background: #fef3c7;
  border-color: var(--amber-400);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}