:root {
  color-scheme: light;

  --color-brand: #3d8a68;
  --color-brand-strong: #4b4c4b;
  --color-brand-soft: color-mix(in srgb, var(--color-brand) 10%, var(--color-paper));
  --color-footer: #4b4c4b;
  --color-partner: color-mix(in srgb, var(--color-soil) 8%, var(--color-paper));
  --color-paper: #eee9de;
  --color-map-paper: #eee9de;
  --color-mist: color-mix(in srgb, var(--color-brand) 5%, var(--color-paper));
  --color-ink: #4b4c4b;
  --color-ink-black: #4b4c4b;
  --color-overlay-ink: #4b4c4b;
  --color-ink-muted: color-mix(in srgb, var(--color-ink) 88%, var(--color-paper));
  --color-line: color-mix(in srgb, var(--color-soil) 30%, var(--color-paper));
  --color-white: #faf8f3;
  --color-focus: #eee9de;
  --color-error: #b42318;

  --color-accent: #d86758;
  --color-soil: #8d6d58;
  --color-water: #40a0a0;
  --color-sunshin: var(--color-brand);
  --color-yulan: var(--color-soil);
  --color-tiansongpi: var(--color-accent);
  --color-hongchailin: var(--color-water);

  --font-display: "Source Sans 3", "Noto Serif TC", "Source Han Serif TC", "PMingLiU", serif;
  --font-body: "Source Sans 3", "Noto Sans TC", "Microsoft JhengHei", Arial, sans-serif;

  --step--1: clamp(0.82rem, 0.79rem + 0.12vw, 0.9rem);
  --step-0: clamp(1rem, 0.96rem + 0.18vw, 1.125rem);
  --step-1: clamp(1.25rem, 1.1rem + 0.65vw, 1.7rem);
  --step-2: clamp(1.65rem, 1.35rem + 1.2vw, 2.45rem);
  --step-3: clamp(2.2rem, 1.65rem + 2.35vw, 4rem);
  --step-4: clamp(3.3rem, 2.3rem + 4vw, 6.5rem);

  --space-1: 0.375rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;
  --space-8: 7rem;

  --radius-sm: 0.45rem;
  --radius-md: 0.9rem;
  --radius-lg: 1.6rem;
  --radius-pill: 999px;
  --shadow-soft: 0 18px 55px color-mix(in srgb, var(--color-ink) 8%, transparent);
  --shadow-card: 0 12px 32px color-mix(in srgb, var(--color-ink) 7%, transparent);

  --container: 75rem;
  --reading: 47.5rem;
  --header-height: 5rem;
  --transition: 180ms ease;
}

@media (max-width: 639px) {
  :root {
    --header-height: 4.25rem;
    --space-7: 3.5rem;
    --space-8: 5rem;
  }
}