:root {
  /* Brand colors normalized from the supplied ErlebIN logo artwork. */
  --color-brand-green: #2d8817;
  --color-brand-green-dark: #165b29;
  --color-brand-green-soft: #eef7ea;
  --color-brand-blue: #0057a7;
  --color-brand-blue-dark: #013f75;
  --color-brand-blue-river: #036ea7;
  --color-brand-blue-soft: #eef6fc;

  /* Neutral palette */
  --color-ink: #12212b;
  --color-text: #45515b;
  --color-text-muted: #6b747c;
  --color-border: #dce3e6;
  --color-surface: #ffffff;
  --color-background: #f7faf8;
  --color-background-alt: #f1f6f8;

  /* Semantic colors: do not use these as core brand colors. */
  --color-success: #237a36;
  --color-warning: #9a6700;
  --color-error: #b42318;
  --color-info: #075985;

  /* Typography */
  --font-heading: "Manrope", "Segoe UI", Arial, sans-serif;
  --font-body: "Inter", "Segoe UI", Arial, sans-serif;
  --font-logo-fallback: "Segoe UI", Arial, sans-serif;

  --text-display: clamp(2.5rem, 5vw, 4.5rem);
  --text-h1: clamp(2.25rem, 4vw, 3.5rem);
  --text-h2: clamp(1.75rem, 3vw, 2.5rem);
  --text-h3: clamp(1.375rem, 2vw, 1.75rem);
  --text-body-lg: 1.125rem;
  --text-body: 1rem;
  --text-small: 0.875rem;
  --text-label: 0.8125rem;

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

  /* Layout */
  --container-max: 75rem;
  --content-max: 48rem;
  --header-height: 4.75rem;
  --section-padding: clamp(4rem, 8vw, 7rem);
  --gutter: clamp(1rem, 4vw, 2rem);

  /* Shape and elevation */
  --radius-sm: 0.5rem;
  --radius-md: 0.875rem;
  --radius-lg: 1.25rem;
  --radius-xl: 1.75rem;
  --radius-pill: 999px;
  --shadow-card: 0 0.5rem 1.5rem rgb(1 63 117 / 0.08);
  --shadow-hover: 0 0.85rem 2rem rgb(1 63 117 / 0.13);

  /* Motion */
  --duration-fast: 150ms;
  --duration-normal: 220ms;
  --duration-slow: 350ms;
  --ease-standard: cubic-bezier(0.2, 0.8, 0.2, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--color-text);
  background: var(--color-background);
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  margin: 0;
  color: var(--color-ink);
  font-family: var(--font-heading);
  line-height: 1.12;
  letter-spacing: -0.025em;
}

h1 { font-size: var(--text-h1); font-weight: 800; }
h2 { font-size: var(--text-h2); font-weight: 750; }
h3 { font-size: var(--text-h3); font-weight: 700; }

.container {
  width: min(100% - 2 * var(--gutter), var(--container-max));
  margin-inline: auto;
}

.button {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.15rem;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-weight: 700;
  text-decoration: none;
  transition: transform var(--duration-fast) var(--ease-standard),
              box-shadow var(--duration-normal) var(--ease-standard),
              background-color var(--duration-normal) var(--ease-standard);
}

.button:hover { transform: translateY(-1px); }
.button:focus-visible { outline: 3px solid rgb(3 110 167 / 0.35); outline-offset: 3px; }
.button--primary { color: #fff; background: var(--color-brand-blue); }
.button--primary:hover { background: var(--color-brand-blue-dark); box-shadow: var(--shadow-hover); }
.button--secondary { color: var(--color-brand-blue-dark); border-color: var(--color-brand-blue); background: #fff; }
.button--green { color: #fff; background: var(--color-brand-green); }

.card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

.brand-gradient {
  background: linear-gradient(120deg, var(--color-brand-green) 0%, var(--color-brand-blue) 100%);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}