/* FAQ Accordion - Study Notes: Uses CSS variables for colors, flexbox for layout,
   JS-calculated height + opacity/transform for accordion animation, and mobile-first media queries */

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

:root {
  --white: hsl(0, 100%, 100%);
  --light-pink: hsl(275, 100%, 97%);
  --purple-600: hsl(292, 16%, 49%);
  --purple-950: hsl(292, 42%, 14%);
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  background-color: var(--light-pink);
  background-image: url(./assets/images/background-pattern-mobile.svg);
  background-repeat: no-repeat;
  background-size: 100% auto;
  font-family: "Work Sans", sans-serif;
  padding: 0.75rem;
}

main {
  margin-top: min(10rem, 15vh);
  width: 100%;
}

img,
svg {
  display: block;
  max-width: 100%;
}

/* Card container - single white card for headline + all questions */
.container {
  display: flex;
  flex-direction: column;
  background-color: var(--white);
  border-radius: 0.5rem;
  padding: 1.5rem;
  width: min(100%, 37.5rem);
  box-shadow: 0 2rem 3rem rgba(47, 21, 52, 0.15);
}

.faq-headline {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.faq-headline h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--purple-950);
}

.faq-headline img {
  width: 1.5rem;
  height: 1.5rem;
}

/* Accordion - list of questions */
.accordion-container {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.question {
  border-bottom: 1px solid var(--light-pink);
}

.question:first-child {
  padding-top: 0;
}

/* Button styles - full width, space between question text and icon */
button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  cursor: pointer;
  background: none;
  padding: 1rem 0;
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--purple-950);
  border: none;
  width: 100%;
  text-align: left;
  transition: color 0.2s ease;
}

button:hover {
  color: var(--purple-600);
}

/* Focus state for keyboard users - important for accessibility */
button:focus-visible {
  outline: 2px solid var(--purple-600);
  outline-offset: 2px;
}

.question p {
  flex: 1;
}

/* Icons - plus shown by default, minus hidden */
.icons {
  flex-shrink: 0;
  width: 30px;
  height: 31px;
  position: relative;
}

.plus-icon,
.minus-icon {
  position: absolute;
  top: 0;
  left: 0;
  width: 30px;
  height: 31px;
}

.minus-icon {
  display: none;
}

/* When open: show minus, hide plus */
.question.active .plus-icon {
  display: none;
}

.question.active .minus-icon {
  display: block;
}

/* Answer - collapsed by default, height is controlled by JavaScript */
.answer {
  height: 0;
  overflow: hidden;
  opacity: 0;
  transform: translateY(-0.25rem);
  transition:
    height 0.3s ease,
    opacity 0.2s ease,
    transform 0.2s ease;
}

.answer p {
  font-size: 1rem;
  font-weight: 400;
  color: var(--purple-600);
  line-height: 1.5;
  padding: 0 0 1.25rem 0;
}

/* When open: fade/slide in for better perceived performance */
.question.active .answer {
  height: auto;
  opacity: 1;
  transform: translateY(0);
}

/* Attribution */
.attribution {
  font-size: 0.75rem;
  color: var(--purple-600);
  text-align: center;
  padding: 1rem;
}

.attribution a {
  color: var(--purple-950);
}

/* Desktop and larger screens */
@media (min-width: 541px) {
  body {
    background-image: url(./assets/images/background-pattern-desktop.svg);
    padding: 1rem;
  }

  .container {
    padding: 1rem 2rem;
    border-radius: 1rem;
  }

  .faq-headline {
    gap: 1.5rem;
    margin-bottom: 2rem;
  }

  .faq-headline h1 {
    font-size: 3.5rem;
  }

  .faq-headline img {
    width: 2.5rem;
    height: 2.5rem;
  }

  button {
    padding: 1.25rem 0;
    font-size: 1rem;
  }

  .answer p {
    font-size: 1rem;
  }
}