/* TOKENS */

:root {
  --w-page-max: 1440px;
  --w-text-max: 660px;

  --f-heading: "Poppins", "Inter", Arial, Helvetica, system-ui, sans-serif;
  --f-text: "Inter", Arial, Helvetica, system-ui, sans-serif;

  --fw-normal: 300;
  --fw-semibold: 600;
  --fw-black: 900;

  --fs-footer: 0.8rem;

  --logo-sm: 6rem;
  --logo-lg: 10rem;

  --c-charcoal: #1f2937; 
  --c-charcoal-10: #1f293710;
  --c-charcoal-20: #1f293720;
  --c-charcoal-50: #1f293750;
  --c-white: #ffffff;
  --c-blue: #1e3a8a;
  --c-blue-30: #1e3a8a30;
  --c-blue-dim: #0b2264;
  --c-gold: #fbbf24;
  --c-gold-dim: #e5ae1f;

  --c-text: var(--c-charcoal);
  --c-background: var(--c-white);
  --c-primary: var(--c-blue);
  --c-accent: var(--c-gold);
  --c-border: var(--c-charcoal-20);

  --c-footer-background: var(--c-primary);
  --c-footer-text: var(--c-background);
}

/* RESETS */

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  vertical-align: middle;
  box-sizing: border-box;
}

ul {
  list-style: none;
}

/* BASE */

img {
  display: block;
  width: 100%;
  height: auto;
}

html {
  scroll-behavior: smooth;
  font-size: 14px;
}

body {
  font-family: var(--f-text);
  font-weight: var(--fw-normal);
  color: var(--c-text);
  background-color: var(--c-background);
}

h1,
h2,
h3 {
  font-family: var(--f-heading);
  max-width: var(--w-text-max);
}

h1 {
  color: var(--c-primary);
}

p {
  max-width: var(--w-text-max);
}

a {
  color: inherit;
  text-decoration: none;
  font-family: inherit;
  max-width: var(--w-text-max);
}

a:hover {
  text-decoration: underline;
  text-underline-offset: 0.15rem;
  text-decoration-thickness: 0.15rem;
}

footer a {
  text-decoration: underline;
}

strong {
  font-weight: var(--fw-semibold);
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  background: var(--c-text);
  color: var(--c-background);
  padding: 0.5rem 1rem;
  z-index: 1000;
}

.skip-link:focus {
  top: 0;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
  outline: 0;
}

.button {
  display: flex;
  flex-direction: row;
  column-gap: 0.5rem;
  width: fit-content;
  padding-block: 0.5rem;
  padding-inline: 1rem;
  border-radius: 0.5rem;
}

.cta-button {
  color: var(--c-text);
  background-color: var(--c-accent);
  font-weight: var(--fw-semibold);
}

.cta-button:hover {
  text-decoration: none;
  background-color: var(--c-gold-dim);
}

.cta-button:active {
  color: var(--c-background);
  background-color: var(--c-text);
}

.secondary-button {
  background-color: var(--c-primary);
  color: var(--c-background);
  font-weight: var(--fw-semibold);
}

.secondary-button:hover {
  text-decoration: none;
  background-color: var(--c-blue-dim);
}

.secondary-button:active {
  background-color: var(--c-text);
}

button:focus-visible,
.cta-button:focus-visible,
.secondary-button:focus-visible {
  outline: 3px solid var(--c-accent);
  outline-offset: 3px;
}

/* MAIN */

main {
  max-width: var(--w-page-max);
  margin-inline: auto;

  display: flex;
  flex-direction: column;
  gap: 4rem;

  padding-block: 4rem;
  padding-inline: 1rem;
}

.page-section {
  display: flex;
  flex-direction: column;
  row-gap: 2rem;
}

.page-title {
  font-size: 2rem;
  font-weight: var(--fw-black);
}

.page-subtitle {
  font-size: 1.5rem;
  font-weight: var(--fw-semibold);
}

@media (min-width: 450px) {
  main {
    padding-inline: 2rem;
  }
}

@media (min-width: 760px) {
  main {
    gap: 6rem;
    padding-block: 6rem;
    padding-inline: 3rem;
  }
}

@media (min-width: 1024px) {
  html {
    font-size: 16px;
  }

  main {
    gap: 8rem;
    padding-block: 8rem;
  }

  .page-section {
    row-gap: 3rem;
  }
}


/* HEADER */

.site-header {
  position: sticky;
  top: 0;
  background-color: var(--c-background);
  border-bottom: 1px solid var(--c-border);
  z-index: 999;
}

.site-header .header-content {
  display: flex;
  align-items: center;
  gap: 2.5rem;

  max-inline-size: var(--w-page-max);
  margin-inline: auto;

  padding-inline: 1rem;
  padding-block: 1rem;
}

.site-header .brand {
  order: 1;
}

.site-header .logo {
  inline-size: 6rem;
}

.site-header .design-line-wrapper {
  order: 2;
  flex: 1;
}

.site-header .design-line {
  height: 0.5rem;
  width: 100%;
}

.site-header .menu {
  order: 3;
  position: relative;
}

.site-header .menu-button {
  background-color: var(--c-background);
  border: none;
  height: 1rem;
  width: 1.5rem;
  cursor: pointer;
  position: relative;
}

.site-header .menu-button span {
  position: absolute;
  display: block;
  left: 0;
  height: 0.2rem;
  width: 100%;
  border-radius: 1rem;
  background-color: var(--c-text);
  transition: transform ease-in 0.25s;
}

.site-header .menu-button span:nth-child(1) {
  top: 0;
}

.site-header .menu-button span:nth-child(2) {
  top: 50%;
  transform: translateY(-50%);
}

.site-header .menu-button span:nth-child(3) {
  bottom: 0;
}

.site-header .menu-button.menu-open span:nth-child(1) {
  transform: translateY(0.4rem) rotate(45deg);
}

.site-header .menu-button.menu-open span:nth-child(2) {
  opacity: 0;
}

.site-header .menu-button.menu-open span:nth-child(3) {
  transform: translateY(-0.4rem) rotate(-45deg);
}

.site-header .nav[hidden] {
  display: none;
}

.site-header .nav {
  position: absolute;
  inset-block-start: 2rem;
  inset-inline-end: 0rem;
}

.site-header .nav ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;

  padding-block: 1rem;
  padding-inline-start: 1rem;
  padding-inline-end: 4rem;
  border-radius: 1rem;

  background-color: var(--c-text);
  color: var(--c-background);
  font-weight: var(--fw-semibold);
}

.site-header .nav ul li a[aria-current="page"] {
  font-weight: var(--fw-black);
  text-decoration: underline;
  text-underline-offset: 0.2rem;
}

@media (min-width: 450px) {
  .site-header .header-content {
    padding-inline: 2rem;
  }
}

@media (min-width: 760px) {
  .site-header .header-content {
    padding-inline: 3rem;
  }
}

@media (min-width: 1024px) {
  .site-header .header-content {
    gap: 2rem;
  }

  .site-header .brand {
    order: 2;
  }

  .site-header .logo {
    inline-size: 8rem;
  }

  .site-header .design-line-wrapper {
    order: 1;
  }

  .site-header .design-line {
    height: 0.8rem;
  }

  .site-header .menu {
    order: 3;
    flex: 1;
  }

  .site-header .menu-button {
    display: none;
  }

  .site-header .nav[hidden] {
    display: block;
  }

  .site-header .nav {
    position: relative;
    inset-block: 0;
    inset-inline: 0;
  }

  .site-header .nav ul {
    flex-direction: row;
    gap: 0;
    justify-content: space-between;

    padding-block: 0;
    padding-inline: 0;

    border-radius: 0;
    background-color: var(--c-background);
    color: var(--c-primary);
  }
}

@media (min-width: 1200px) {
  .site-header .header-content {
    gap: 5rem;
  }

  .site-header .logo {
    inline-size: 10rem;
  }
}


/* FOOTER */

.site-footer {
  color: var(--c-footer-text);
  font-size: var(--fs-footer);
}

.site-footer .footer-content-container {
  background-color: var(--c-footer-background);
}

.site-footer .footer-content {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: repeat(3, auto);
  grid-template-areas: "brand brand" "sdgs sdgs" "nav contacts";
  column-gap: 2rem;
  row-gap: 2.5rem;
  padding-block: 2.5rem;
  padding-inline: 1rem;
}

.site-footer .brand {
  grid-area: brand;
}

.site-footer .logo {
  width: 6rem;
}

.site-footer .un-sdgs {
  grid-area: sdgs;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  column-gap: 0.5rem;
  align-items: center;
  max-width: 25rem;
  padding-inline: 1rem;
}

.site-footer .nav {
  grid-area: nav;
  display: flex;
  flex-direction: column;
  row-gap: 0.5rem;
  padding-inline-start: 1rem;
}

.site-footer .nav h2 {
  font-weight: 600;
  font-size: 1rem;
}

.site-footer .nav ul {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.site-footer .contact-details {
  grid-area: contacts;
  display: flex;
  flex-direction: column;
  row-gap: 0.5rem;
}

.site-footer .contact-details h2 {
  font-weight: 600;
  font-size: 1rem;
}

.site-footer .contact-details > div {
  display: flex;
  flex-direction: column;
}

.site-footer .copyright {
  text-align: center;
  background-color: var(--c-text);
  padding-block: 1.5rem;
  padding-inline: 1rem;
  max-width: 100%;
}

@media (min-width: 450px) {
  .site-footer .footer-content {
    grid-template-rows: repeat(2, auto);
    grid-template-areas: "brand sdgs" "nav contacts";
    padding-inline: 2rem;
  }

  .site-footer .un-sdgs {
    align-self: center;
  }
}

@media (min-width: 760px) {
  .site-footer .footer-content {
    grid-template-columns: auto auto auto auto;
    grid-template-rows: auto;
    grid-template-areas: "brand sdgs nav contacts";
    padding-inline: 3rem;
  }

  .site-footer .un-sdgs {
    padding-inline: 0;
    align-self: self-start;
  }

  .site-footer .nav {
    padding-inline-start: 0;
  }
}

@media (min-width: 1024px) {
  .site-footer .footer-content {
    max-width: var(--w-page-max);
    margin-inline: auto;
    justify-content: space-between;
  }

  .site-footer .logo {
    width: 8rem;
  }

  .site-footer .un-sdgs {
    max-width: 40rem;
  }
}

/* HOME PAGE */

/* HOME > SECTION: Hero */

.hero {
  display: flex;
  flex-direction: column;
  row-gap: 1.5rem;
}

.hero .hero-image {
  max-width: 35rem;
  height: 100%;
}

.hero .hero-content {
  display: flex;
  flex-direction: column;
  row-gap: 1rem;
}

.hero .cta-button {
  margin-block-start: 0.5rem;
}

@media (min-width: 760px) {
  .hero {
    flex-direction: row-reverse;
    justify-content: space-between;
  }

  .hero .hero-image {
    max-width: 30rem;
  }
}

@media (min-width: 1024px) {
  .hero .hero-content {
    max-width: 45rem;
  }
}

/* HOME > SECTION: What We Stand For (Values) */

.values {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3rem;
}

.values .values-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 1rem;
}

.values .value-card {
  display: flex;
  flex-direction: column;
  row-gap: 1rem;
  background-color: var(--c-charcoal-10);
  padding-block: 1rem;
  padding-inline: 1rem;
  border-radius: 0.5rem;
}

.values .value-card dt {
  font-size: 1rem;
  font-weight: var(--fw-semibold);
  display: flex;
  flex-direction: column;
  row-gap: 1rem;
}

.values .value-card img {
  width: 2.5rem;
}

@media (min-width: 1024px) {
  .values {
    gap: 4rem;
  }

  .values .values-grid {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(2, 1fr);
  }
}

/* HOME > SECTION: UN Sustainability Goals We Support */

.sdgs {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3rem;
}

.sdgs .sdgs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: 1rem;
}

.sdgs .sdg-card img {
  max-width: 15rem;
}

.sdgs .sdg-card img:hover {
  box-shadow: 0 0.3rem 0.5rem var(--c-text);
}

@media (min-width: 760px) {
  .sdgs .sdgs-grid {
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: 1fr;
  }
}

@media (min-width: 1024px) {
  .sdgs {
    gap: 4rem;
  }
}

/* PRINCIPLES PAGE */

.principles .principles-header {
  display: flex;
  flex-direction: column;
  row-gap: 1.5rem;
}

.principles .search-form {
  position: relative;
  max-width: 40rem;
}

.principles .search-form input {
  width: 100%;
  padding-block: 1rem;
  padding-inline: 1rem;
  border-radius: 5rem;
  border: 1px solid var(--c-text);
}

.principles .search-form input::placeholder {
  color: var(--c-text);
  font-style: italic;
  font-size: 1rem;
  opacity: 1;
}

.principles .search-form button {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  background-color: inherit;
  border: none;
  cursor: pointer;
}

.principles .principles-grid {
  display: grid;
  grid-template-columns: 1fr;
  row-gap: 1.5rem;
}

.principles .principle-card {
  display: flex;
  flex-direction: column;
  row-gap: 1rem;
  padding-block: 1rem;
  padding-inline: 1rem;
  background-color: var(--c-charcoal-10);
  border-radius: 0.5rem;
}

.principles .principle-card dt {
  display: flex;
  flex-direction: column;
  row-gap: 1rem;
}

.principles .principle-serial {
  font-size: 1.5rem;
  font-weight: var(--fw-black);
}

.principles .principle-title {
  font-weight: var(--fw-semibold);
}

.principles .principle-card dd {
  display: flex;
  flex-direction: column;
  row-gap: 1rem;
}

.principles .sdg-labels {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.principles .sdg-labels span {
  padding-block: 0.5rem;
  padding-inline: 0.5rem;
  background-color: var(--c-blue-30);
  border-radius: 0.25rem;
  font-weight: var(--fw-semibold);
  font-size: 0.8rem;
}

.principles .sdg-labels span:hover {
  background-color: var(--c-gold);
  cursor: default;
}

@media (min-width: 760px) {
  .principles .principles-grid {
    grid-template-columns: repeat(2, 1fr);
    column-gap: 1.5rem;
  }
}

@media (min-width: 1024px) {
  .principles .principles-grid {
    grid-template-columns: repeat(3, 1fr);
    column-gap: 1.5rem;
  }
}

@media (min-width: 1200px) {
  .principles .principles-grid {
    grid-template-columns: repeat(4, 1fr);
    column-gap: 1.5rem;
  }
}

/* PRACTICE PAGE */

.practice .practice-header {
  display: flex;
  flex-direction: column;
  row-gap: 1.5rem;
}

.practice .table-wrapper {
  overflow-x: auto;
  position: relative;
  width: 100%;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
}

.practice .table-hint {
  font-size: 0.8rem;
  margin-block-end: 1rem;
}

.practice table {
  min-width: 1000px;
  border-collapse: collapse;
  border: 1px solid var(--c-charcoal-50);
}

.practice table tr {
  border: 1px solid var(--c-charcoal-50);
}

.practice table thead tr th {
  background-color: var(--c-text);
  color: var(--c-background);
  padding-block: 0.8rem;
  padding-inline: 1rem;
  text-align: left;
}

.practice table tbody tr > * {
  padding-block: 0.8rem;
  padding-inline: 1rem;
  text-align: left;
}

@media (min-width: 1100px) {
  .practice .table-hint {
    display: none;
  }
}

/* REFERENCES PAGE */

.references .references-header {
  display: flex;
  flex-direction: column;
  row-gap: 1.5rem;
}

.references .references-list {
  padding-inline-start: 1.25rem;
  display: flex;
  flex-direction: column;
  row-gap: 1.25rem;
}

.references .references-list li {
  line-height: 1.6;
}

.references .references-list em {
  font-style: italic;
  font-weight: var(--fw-semibold);
}

.references .references-list li::marker {
  font-weight: var(--fw-semibold);
  color: var(--c-primary);
}

.references a {
  color: var(--c-primary);
  text-decoration: underline;
  text-underline-offset: 0.2rem;
  overflow-wrap: break-word;
}

.references a:hover {
  text-decoration-thickness: 0.15rem;
}

.references .references-list li:not(:last-child) {
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--c-charcoal-20);
}

/* CONTACT PAGE */

.contact .contact-header {
  display: flex;
  flex-direction: column;
  row-gap: 1.5rem;
}

.contact-layout {
  display: grid;
  grid-template-columns: 1fr;
  row-gap: 2rem;
}

.contact .contact-form {
  display: flex;
  flex-direction: column;
  row-gap: 2rem;
}

.contact .form-field {
  display: flex;
  flex-direction: column;
  row-gap: 1rem;
}

.contact input,
.contact textarea {
  padding-block: 1rem;
  padding-inline: 1rem;
  border-radius: 0.5rem;
  border: 1px solid var(--c-text);
  font-size: 1rem;
}

.contact input::placeholder,
.contact textarea::placeholder {
  font-family: var(--f-text);
  font-size: 1rem;
  font-style: italic;
  opacity: 1;
}

.contact button {
  border: none;
  font-size: 1rem;
}

.contact .contact-details {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.contact .contact-details .address-block,
.contact .contact-details ul li {
  display: flex;
  gap: 1rem;
}

.contact .contact-details ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.contact .contact-details img {
  height: 1.5rem;
  width: auto;
}

.contact .privacy-notice {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

@media (min-width: 760px) {
  .contact-layout {
    grid-template-columns: 1fr 1fr;
    column-gap: 4rem;
  }
}

/* THANK YOU PAGE */

.thank-you .thank-you-header {
  display: flex;
  flex-direction: column;
  row-gap: 1.5rem;
}

.thank-you .thank-you-notice {
  font-size: 0.8rem;
  background-color: var(--c-blue-30);
  padding-block: 1rem;
  padding-inline: 1.5rem;
  position: relative;
  width: fit-content;
}

.thank-you .thank-you-notice::before,
.thank-you .thank-you-notice::after {
  content: "";
  position: absolute;
  width: 0.5rem;
  height: 100%;
  top: 0;
  background-color: var(--c-accent);
}

.thank-you .thank-you-notice::before {
  left: 0;
}

.thank-you .thank-you-notice::after {
  right: 0;
}