:root {
  --color-bg-default: #FFFFFF;
  --color-bg-alt: #F5F5F7;
  --color-surface-concrete: #E3E3E6;
  --color-surface-wood: #F7EDD6;

  --color-text-primary: #181818;
  --color-text-secondary: #555A5E;

  --color-accent-black: #000000;
  --color-border-light: #D0D0D3;

  --color-cta-play-bg: #242424;
  --color-cta-play-text: #FFFFFF;

  --font-sans: 'Inter', 'Segoe UI', 'Arial', sans-serif;

  --text-xl: clamp(1.8rem, 2.5vw, 2.2rem);
  --text-lg: clamp(1.4rem, 2vw, 1.6rem);
  --text-md: 1.25rem;
  --text-base: 1rem;
  --text-sm: 0.875rem;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 2rem;
  --space-4: 3rem;
  --space-5: 4rem;

  --container-max: 1200px;
  --container-pad-mobile: 1rem;
  --container-pad-desktop: 2rem;

  --radius-sm: 6px;

  --shadow-subtle: 0 1px 2px rgba(0,0,0,0.03);

  --transition-fast: 150ms ease-in-out;
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--color-bg-default);
  color: var(--color-text-primary);
  min-height: 100vh;
  text-rendering: optimizeLegibility;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}

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

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

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

a:hover {
  text-decoration: underline;
}

:focus-visible {
  outline: 2px solid #242424;
  outline-offset: 2px;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

h1 { font-size: var(--text-xl); }
h2 { font-size: var(--text-lg); }
h3 { font-size: var(--text-md); }
h4 { font-size: var(--text-base); }
h5, h6 { font-size: var(--text-sm); }

p {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

ul,
ol {
  padding-left: 1.25rem;
  margin-bottom: var(--space-2);
}

li {
  line-height: 1.5;
}

blockquote {
  padding-left: var(--space-2);
  border-left: 3px solid var(--color-border-light);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

hr {
  border: none;
  border-top: 1px solid var(--color-border-light);
  margin: var(--space-3) 0;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-pad-mobile);
  padding-right: var(--container-pad-mobile);
}

@media (min-width: 768px) {
  .container {
    padding-left: var(--container-pad-desktop);
    padding-right: var(--container-pad-desktop);
  }
}

.section {
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
}

.section-alt {
  background: var(--color-bg-alt);
}

.surface {
  background: var(--color-surface-concrete);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
}

.surface-wood {
  background: var(--color-surface-wood);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
}

.card {
  background: var(--color-bg-default);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  box-shadow: var(--shadow-subtle);
}

.stack > * + * {
  margin-top: var(--space-2);
}

.cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
}

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

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

.flex-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.flex > *,
.flex-col > *,
.flex-center > *,
.flex-between > * {
  min-width: 0;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 1.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-accent-black);
  background: transparent;
  color: var(--color-text-primary);
  font-weight: 600;
  text-align: center;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.button:hover {
  background: var(--color-surface-concrete);
}

.button:active {
  background: #E0E0E0;
}

.button-primary {
  background: var(--color-accent-black);
  color: #FFFFFF;
}

.button-primary:hover {
  background: #181818;
}

.button-play {
  background: var(--color-cta-play-bg);
  color: var(--color-cta-play-text);
  border: 1px solid var(--color-cta-play-bg);
}

.button-play:hover {
  background: #181818;
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  background: #FFFFFF;
}

input:focus,
textarea:focus,
select:focus {
  outline: 2px solid #242424;
  outline-offset: 1px;
}

.content > *:last-child,
.stack > *:last-child,
.surface > *:last-child,
.card > *:last-child {
  margin-bottom: 0;
}