/*
  How It Works 11 — standalone HTML/CSS/JS implementation.
  No build step, no framework, no external dependency: copy these three
  files into any project and open index.html as-is.
*/

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

:root {
  --white: #ffffff;
  --slate-50: #f8fafc;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-900: #0f172a;
  --font-sans:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji",
    "Segoe UI Emoji";
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--slate-900);
  background-color: var(--white);
  line-height: 1.5;
}

.hiw {
  padding: clamp(3rem, 2.5rem + 2vw, 5rem) clamp(1rem, 0.3rem + 3vw, 2rem);
}

.hiw__inner {
  width: 100%;
  max-width: 48rem;
  margin: 0 auto;
}

.hiw__intro {
  text-align: center;
}

.hiw__kicker {
  margin: 0;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--slate-500);
}

.hiw__heading {
  margin: 0.75rem 0 0;
  font-weight: 600;
  font-size: clamp(1.875rem, 1.5rem + 1.9vw, 2.5rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.rows {
  margin: 2.5rem 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-radius: 1rem;
  border: 1px solid var(--slate-200);
}

.row {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  padding: 1.5rem;
  background-color: var(--white);
  border-top: 1px solid var(--slate-200);
}

.row:first-child {
  border-top: none;
}

.row--alt {
  background-color: var(--slate-50);
}

.row__number {
  flex-shrink: 0;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--slate-300);
}

.row__title {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

.row__text {
  margin: 0.25rem 0 0;
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--slate-600);
}

@media (min-width: 640px) {
  .row {
    align-items: center;
    padding: 1.5rem 2rem;
  }

  .row__number {
    font-size: 1.875rem;
  }

  .row__title {
    font-size: 1.125rem;
  }

  .row__text {
    font-size: 1rem;
  }
}

/* Scroll-triggered reveal — script.js adds .is-visible via
   IntersectionObserver as each row enters the viewport. Reduced motion
   disables the transition only; the class is still toggled so nothing
   stays hidden. */
.row {
  opacity: 0;
  transform: translateY(14px);
}

.row.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: no-preference) {
  .row {
    transition:
      opacity 600ms cubic-bezier(0.16, 1, 0.3, 1),
      transform 600ms cubic-bezier(0.16, 1, 0.3, 1);
  }
}

@media (prefers-reduced-motion: reduce) {
  .row {
    opacity: 1;
    transform: none;
  }
}
How It Works 11

Requirements

Dependencies

Usage
