/* ==========================================================================
   1.  Design System Configurations
   ========================================================================== */
:root {
  /* Color Palette Tokens */
  --color-purple-700: hsl(257, 40%, 49%);
  --color-magenta-400: hsl(300, 69%, 71%);
  --color-white: hsl(0, 0%, 100%);
  --color-neutral-dark: hsl(257, 40%, 10%);

  /* Font Configurations */
  --font-headings: 'Poppins', sans-serif;
  --font-body: 'Open Sans', sans-serif;

  /* Responsive Typography Weights & Sizes */
  --fs-body: 1rem;
  --fs-title-mov: 1.5rem;    /* 24px */
  --fs-title-desk: 2.5rem;   /* 40px */
  --fs-desc-mov: 1rem;       /* 16px */
  --fs-desc-desk: 1.125rem;  /* 18px */

  /* Global Layout Variables */
  --max-width-container: 80rem; /* 1280px Maximum grid bounds */
  --box-shadow-ui: 0px 8px 16px rgba(0, 0, 0, 0.22);
}

/* ==========================================================================
   2. Reset Framework Rules
   ========================================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-white);
  background-color: var(--color-purple-700);
  background-image: url('./images/bg-mobile.svg');
  background-repeat: no-repeat;
  background-position: top center;
  background-size: contain;
  min-height: 100vh;
}

@media (min-width: 53.125rem) { /* Breakpoint threshold at 850px */
  body {
    background-image: url('./images/bg-desktop.svg');
    background-position: left top;
    background-size: cover;
  }
}

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

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

/* Screen Reader Skip-To Utility Link */
.skip-link {
  position: absolute;
  top: -10rem;
  left: 1rem;
  background: var(--color-magenta-400);
  color: var(--color-purple-700);
  padding: 0.5rem 1rem;
  z-index: 100;
  font-weight: 600;
  border-radius: 0.25rem;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 1rem;
}

*:focus-visible {
  outline: 0.1875rem dashed var(--color-magenta-400);
  outline-offset: 0.25rem;
}

/* ==========================================================================
   3. Page Canvas Structural Shell Container
   ========================================================================== */
.page-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding: 2.5rem 2.25rem 2rem;
}

@media (min-width: 53.125rem) {
  .page-container {
    padding: 3.5rem 5rem 3rem;
  }
}

/* ==========================================================================
   4. Header Component Alignment
   ========================================================================== */
.header {
  margin-block-end: 3.125rem;
}

.header__container {
  max-width: var(--max-width-container);
  margin-inline: auto;
}

.header__logo {
  width: 7.5rem; /* ~120px mobile design map */
  height: auto;
}

@media (min-width: 53.125rem) {
  .header {
    margin-block-end: 4rem;
  }
  
  .header__logo {
    width: 12.5rem; /* ~200px desktop design scale mapping */
  }
}

/* ==========================================================================
   5. Main Grid Block Component Layout Splits
   ========================================================================== */
.main-layout {
  flex-grow: 1;
  margin-block-end: 2.5rem;
  display: flex;
  align-items: center;
}

.main-layout__container {
  max-width: var(--max-width-container);
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 3.5rem;
  align-items: center;
  width: 100%;
}

@media (min-width: 53.125rem) {
  .main-layout__container {
    grid-template-columns: 1.32fr 1fr;
    gap: 3.75rem;
  }
}

.main-layout__visual {
  display: flex;
  justify-content: center;
  width: 100%;
}

.main-layout__hero-img {
  width: 100%;
  height: auto;
}

.main-layout__content {
  text-align: center;
}

@media (min-width: 53.125rem) {
  .main-layout__content {
    text-align: left;
    padding-inline-start: 1.5rem;
  }
}

.main-layout__title {
  font-family: var(--font-headings);
  font-size: var(--fs-title-mov);
  font-weight: 600;
  line-height: 1.5;
  margin-block-end: 1rem;
}

@media (min-width: 53.125rem) {
  .main-layout__title {
    font-size: var(--fs-title-desk);
    line-height: 1.4;
    margin-block-end: 1.5rem;
  }
}

.main-layout__description {
  font-family: var(--font-body);
  font-size: var(--fs-desc-mov);
  line-height: 1.6;
  opacity: 0.88;
  margin-block-end: 1.75rem;
}

@media (min-width: 53.125rem) {
  .main-layout__description {
    font-size: var(--fs-desc-desk);
    margin-block-end: 1.875rem;
  }
}

/* ==========================================================================
   6. UI Interface Interactions UI Element Components
   ========================================================================== */
.button {
  display: inline-block;
  font-family: var(--font-headings);
  font-size: 0.75rem;
  font-weight: 400;
  padding: 0.75rem 4.5rem;
  border-radius: 6.25rem;
  box-shadow: var(--box-shadow-ui);
  border: none;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.1s ease;
}

@media (min-width: 53.125rem) {
  .button {
    font-size: 1.125rem;
    padding: 1rem 4.75rem;
  }
}

.button:active {
  transform: scale(0.98);
}

.button--primary {
  background-color: var(--color-white);
  color: var(--color-purple-700);
}

/* Registration Hover & Focus Active State Settings */
.button--primary:hover {
  background-color: var(--color-magenta-400);
  color: var(--color-white);
}

/* ==========================================================================
   7. Footer Navigation Layout Components
   ========================================================================== */
.footer {
  margin-block-start: auto;
}

.footer__container {
  max-width: var(--max-width-container);
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  width: 100%;
}

@media (min-width: 53.125rem) {
  .footer__container {
    flex-direction: row-reverse;
    justify-content: space-between;
    align-items: flex-end;
  }
}

.social-list {
  display: flex;
  gap: 0.75rem;
}

.social-list__link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.875rem;
  height: 1.875rem;
  border: 0.0625rem solid var(--color-white);
  border-radius: 50%;
  font-size: 0.875rem;
  transition: color 0.2s ease, border-color 0.2s ease;
}

@media (min-width: 53.125rem) {
  .social-list__link {
    width: 2.5rem;
    height: 2.5rem;
    font-size: 1rem;
  }
}

/* Social Media Interactive Hover & Focus States Setup */
.social-list__link:hover {
  color: var(--color-magenta-400);
  border-color: var(--color-magenta-400);
}

/* ==========================================================================
   8. Small Footnote Attribution Text Setup
   ========================================================================== */
.attribution {
  font-size: 0.6875rem;
  text-align: center;
  opacity: 0.55;
}

.attribution a {
  color: var(--color-magenta-400);
  font-weight: 600;
}

.attribution a:hover {
  text-decoration: underline;
}

@media (min-width: 53.125rem) {
  .attribution {
    text-align: left;
  }
}