:root {
  color-scheme: dark;

  /* Typography */
  --font-family-sans: "Roboto Flex", "SF Pro Display", "Segoe UI", sans-serif;
  --font-family-annotation: "Bad Script", "Segoe Script", cursive;
  --font-family-mono:
    "SFMono-Regular", "SF Mono", "Cascadia Code", "Fira Code", monospace;

  /* Type scale */
  --font-size-00: 0.75rem;
  --font-size-0: 0.875rem;
  --font-size-1: 1rem;
  --font-size-2: 1.125rem;
  --font-size-3: 1.25rem;
  --font-size-4: 1.5rem;
  --font-size-5: 1.875rem;
  --font-size-6: 2.375rem;
  --font-size-7: 3.25rem;

  --line-height-tight: 1.15;
  --line-height-snug: 1.3;
  --line-height-body: 1.6;

  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0;
  --letter-spacing-loose: 0.04em;

  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 2.5rem;
  --space-8: 3rem;
  --space-9: 4rem;
  --space-10: 5rem;
  --space-11: 6rem;

  /* Layout */
  --container-width-content: 76rem;
  --container-width-reading: 42rem;
  --nav-height-desktop: 5rem;
  --nav-height-mobile: 4rem;

  /* Legacy palette base */
  --color-canvas: #111111;
  --color-surface-1: #161616;
  --color-surface-2: #1d1d1d;
  --color-surface-3: #222222;
  --color-surface-4: #2a2a2a;

  --color-text-strong: #e2e6e2;
  --color-text-primary: #c9cfca;
  --color-text-secondary: #9ea79f;
  --color-text-muted: #778179;
  --color-text-disabled: #616161;

  --color-annotation: #474545;
  --color-accent: #295928;
  --color-accent-hover: #347133;
  --color-accent-pressed: #214820;
  --color-accent-soft: rgba(68, 154, 66, 0.16);
  --color-link: #449a42;
  --color-warning: #d43a3a;

  /* Glass layer */
  --glass-bg-subtle: rgba(29, 29, 29, 0.68);
  --glass-bg-strong: rgba(34, 34, 34, 0.82);
  --glass-stroke: rgba(240, 247, 240, 0.06);
  --glass-stroke-strong: rgba(240, 247, 240, 0.1);
  --glass-highlight: rgba(240, 247, 240, 0.05);
  --glass-tint-accent: rgba(52, 113, 51, 0.18);
  --glass-blur-sm: 12px;
  --glass-blur-md: 18px;
  --glass-blur-lg: 28px;
  --glass-saturate: 140%;

  /* Borders */
  --border-subtle: 1px solid rgba(240, 247, 240, 0.05);
  --border-default: 1px solid rgba(240, 247, 240, 0.07);
  --border-strong: 1px solid rgba(240, 247, 240, 0.11);
  --border-accent: 1px solid rgba(68, 154, 66, 0.42);

  /* Radii */
  --radius-xs: 0.5rem;
  --radius-sm: 0.75rem;
  --radius-md: 1rem;
  --radius-lg: 1.25rem;
  --radius-xl: 1.5rem;
  --radius-2xl: 1.75rem;
  --radius-pill: 999px;

  /* Shadows */
  --shadow-xs: 0 4px 12px rgba(0, 0, 0, 0.18);
  --shadow-sm: 0 10px 24px rgba(0, 0, 0, 0.22);
  --shadow-md: 0 18px 44px rgba(0, 0, 0, 0.28);
  --shadow-lg: 0 28px 80px rgba(0, 0, 0, 0.36);
  --shadow-accent: 0 16px 42px rgba(41, 89, 40, 0.22);
  --shadow-inset-highlight: inset 0 1px 0 rgba(240, 247, 240, 0.04);

  /* Motion */
  --duration-fast: 140ms;
  --duration-base: 220ms;
  --duration-slow: 320ms;
  --ease-standard: cubic-bezier(0.2, 0.8, 0.2, 1);
  --ease-emphasized: cubic-bezier(0.22, 1, 0.36, 1);

  /* Focus */
  --focus-ring:
    0 0 0 2px rgba(17, 17, 17, 0.8), 0 0 0 4px rgba(68, 154, 66, 0.55);

  /* Component tokens */
  --shell-bg: linear-gradient(
    180deg,
    rgba(24, 24, 24, 0.92) 0%,
    rgba(18, 18, 18, 0.98) 100%
  );
  --shell-border: var(--border-default);
  --shell-radius: var(--radius-2xl);
  --shell-shadow: var(--shadow-lg);

  --panel-bg: linear-gradient(
    180deg,
    rgba(31, 31, 31, 0.88) 0%,
    rgba(22, 22, 22, 0.94) 100%
  );
  --panel-border: var(--border-subtle);
  --panel-radius: var(--radius-xl);
  --panel-shadow: var(--shadow-sm);

  --panel-glass-bg: linear-gradient(
    180deg,
    rgba(37, 37, 37, 0.7) 0%,
    rgba(24, 24, 24, 0.82) 100%
  );
  --panel-glass-border: var(--border-default);
  --panel-glass-radius: var(--radius-xl);
  --panel-glass-shadow: var(--shadow-md);
  --panel-glass-backdrop: blur(var(--glass-blur-md))
    saturate(var(--glass-saturate));

  --button-height-md: 3rem;
  --button-height-lg: 3.5rem;
  --button-padding-inline: 1.25rem;
  --button-radius: var(--radius-md);

  --button-primary-bg: linear-gradient(180deg, #347133 0%, #295928 100%);
  --button-primary-text: var(--color-text-strong);
  --button-primary-shadow: var(--shadow-accent);

  --button-secondary-bg: rgba(255, 255, 255, 0.04);
  --button-secondary-text: var(--color-text-primary);
  --button-secondary-border: var(--border-default);

  --input-height: 3.5rem;
  --input-radius: var(--radius-lg);
  --input-bg: rgba(34, 34, 34, 0.78);
  --input-border: 1px solid rgba(255, 255, 255, 0.09);
  --input-border-focus: 1px solid rgba(68, 154, 66, 0.55);
  --input-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);

  --tag-font-family: var(--font-family-annotation);
  --tag-font-size: 1rem;
  --tag-color: var(--color-annotation);

  --nav-bg: rgba(24, 24, 24, 0.7);
  --nav-border: 1px solid rgba(255, 255, 255, 0.07);
  --nav-backdrop: blur(var(--glass-blur-lg)) saturate(var(--glass-saturate));
}

@media (max-width: 64rem) {
  :root {
    --font-size-7: 2.75rem;
    --font-size-6: 2.125rem;
    --space-9: 3.5rem;
    --space-10: 4.5rem;
    --shell-radius: var(--radius-xl);
  }
}

@media (max-width: 42rem) {
  :root {
    --font-size-7: 2.25rem;
    --font-size-6: 1.875rem;
    --font-size-5: 1.625rem;
    --space-8: 2.5rem;
    --space-9: 3rem;
    --button-height-lg: 3.25rem;
    --input-height: 3.25rem;
    --panel-radius: var(--radius-lg);
    --panel-glass-radius: var(--radius-lg);
  }
}