/* simple reset */

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

:root {
  --black: #000000;
  --white: #ffffff;

  --grey-100: #F7FAFC;
  --grey-200: #EDF2F7;
  --grey-300: #E2E8F0;
  --grey-400: #CBD5E0;
  --grey-500: #A0AEC0;
  --grey-600: #718096;
  --grey-700: #4A5568;
  --grey-800: #2D3748;
  --grey-900: #1A202C;

  --blue-100: #EBF8FF;
  --blue-200: #BEE3F8;
  --blue-300: #90CDF4;
  --blue-400: #63B3ED;
  --blue-500: #4299E1;
  --blue-600: #3182CE;
  --blue-700: #2B6CB0;
  --blue-800: #2C5282;
  --blue-900: #2A4365;
}

/* typography */

html {
  font-size: 10px;
}

body {
  font-family: system-ui, BlinkMacSystemFont, -apple-system, Segoe UI, Roboto, Oxygen, Ubuntu, Cantarell, Fira Sans, Droid Sans, Helvetica Neue, sans-serif;;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  color: var(--grey-700);
  font-size: 1.6rem;
}

h1 {
  font-size: 2.4rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.6rem;
  color: var(--blue-800);
}

h3 span {
  font-size: smaller;
  color: var(--blue-600);
}

p {
  font-size: 1.6rem;
  line-height: 2.8rem;
}

/* spacing */

section {
  margin-bottom: 4rem;
}

h1, h3 {
  margin-top: 3.6rem;
}

h2 {
  margin-top: 4.8rem;
}

p, ul, ol, figure {
  margin-top: 1.6rem;
}

figure {
  padding: 3rem 0;
}

/* ------------------------------------ */

.container, section {
  margin: 0 auto;
  padding-left: 1.6rem;
  padding-right: 1.6rem;
}

ul, ol {
  margin-left: 2.4rem;
}

a {
  font-weight: bold;
  color: #e3352f;
}

a:visited {
  color: #621b18;
}

header {
  padding: 5rem 0;
  text-align: center;
  text-transform: uppercase;
}

header h1 {
  margin: 0;
  font-family: Raleway, sans-serif;
}

.tag-line {
  margin-top: 0;
  margin-bottom: 2rem;
  color: var(--grey-600);
}

.intro-wrapper {
  padding: 5rem 0;
  color: var(--blue-100);
  background-color: var(--blue-700);
}

.intro-wrapper p:first-child {
  margin-top: 0;
}

.login {
  margin-top: .5rem;
  padding: .3rem 1rem;
  border: 1px solid var(--white);
  border-radius: 2px;
  text-transform: uppercase;
  font-size: smaller;
}

.login:hover {
  background-color: var(--blue-700);
  text-decoration: none;
}

.nav-wrapper {
  background-color: var(--grey-900);
  box-shadow: 0 15px 30px 0 rgba(0, 0, 0, .11), 0 5px 15px 0 rgba(0, 0, 0, .08);
}

nav {
  margin: 0 auto;
  width: 90%;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  padding: 1.6rem 0;
}

nav ul li {
  margin: 0;
}

nav ul li:before {
  display: none;
}

nav a {
  display: inline-block;
  text-decoration: none;
  color: var(--white);
}

nav a:visited {
  color: var(--white);
}

nav a:hover {
  text-decoration: underline;
}

.aco  {
  display: flex;
  flex-grow: 1;
  margin-top: 1rem;
  margin-right: 1rem;
  margin-bottom: 1rem;
  color: var(--white);
  align-items: center;
  text-decoration: none;
  font-family: Raleway, sans-serif;
}

.aco:hover {
  text-decoration: none;
}

.aco span {
  margin-left: .5rem;
  font-weight: bold;
  font-size: 1.6rem;
  letter-spacing: .05em;
}

nav ul {
  list-style-type: none;
  display: flex;
  flex-direction: column;
  flex-wrap: wrap;
}

nav ul {
  margin: 0;
}

nav ul li {
  margin-bottom: 0;
  padding-bottom: .5rem;
}

footer {
  margin-top: 8rem;
  padding: 4rem 0;
  color: #fff;
  background-color: var(--grey-900);
}

footer .aco {
  margin-bottom: 2rem;
}

footer p {
  font-size: smaller;
}

footer a {
  color: var(--white);
  font-weight: bold;
}

footer a:visited {
  color: var(--white);
}

ul li,
ol li {
  margin-top: 1rem;
  margin-left: 1rem;
  line-height: 2.4rem;
  font-size: 1.5rem;
  color: var(--grey-700);
}

h2 .heading-number {
  font-size: .6em;
}

/* forms */

form {
  margin: 0 auto;
}

label,
fieldset,
textarea {
  margin-top: 2.4rem;
}

input[type="text"],
input[type="password"] {
  margin-top: 1rem;
}

label {
  display: block;
  font-weight: bold;
}

fieldset,
input,
textarea {
  border: 1px solid var(--grey-400);
}

textarea,
input[type="text"],
input[type="password"] {
  display: block;
  padding: .5rem;
  width: 100%;
  border-radius: 3px;
}

textarea {
  height: 200px;
}

input[type="submit"] {
  margin-top: 3rem;
  padding: .5rem 2rem;
  border: 1px solid #fff;
  border-radius: 4px;
  text-transform: uppercase;
  background-color: var(--blue-700);
  color: var(--white);
  font-weight: bold;
}

fieldset {
  padding: 3rem;
  border-radius: 3px;
}

fieldset p {
  margin: 0;

}

legend {
  padding: 0 .5rem;
  font-weight: bold;
}

.note {
  padding: 2rem;
  background-color: var(--blue-100);
  color: var(--blue-800);
  font-weight: bold;
  border: 1px solid var(--blue-200);
  border-radius: 2px;
  font-size: smaller;
}

/* media queries */

/* tablet+ */
@media (min-width: 601px) {

  .container, section {
    max-width: 720px;
  }

  h1 {
    font-size: 3.6rem;
  }

  h2 {
    font-size: 3rem;
  }

  h3 {
    font-size: 2.4rem;
  }

  nav {
    padding: 2rem 0;
  }

  nav ul {
    flex-direction: row;
    align-items: center;
  }

  nav ul li {
    margin-top: 1rem;
    margin-bottom: 1rem;
    padding-bottom: 0;
  }

  nav ul li a {
    display: inline-block;
    margin-right: 1rem;
  }

  .login {
    margin-top: 0;
    letter-spacing: .05em;
  }
}