/*
  NOTE:

  Throughout this file, `1rem` is equal to
  `10px`, assuming a browser's default font
  size of `16px`. This is set by applying a
  `62.5%` adjustment to the `<html>` size.
*/

/*
Variables.
==================================================
*/

:root {
    --body-font-size: 1.5rem;
    --max-page-width: 900px;
    --spacing: 2rem;
  }
  
  /*
  Set defaults.
  ==================================================
  */
  
  * {
    color: inherit;
    font-family: sans-serif;
    text-rendering: optimizeSpeed;
  }
  
  /*
  Body styles.
  ==================================================
  */
  
  html {
    /*
      This takes the default `16px` and
      changes it to `10px`, so our `rem`
      measurements are base 10, not 16.
    */
    font-size: 62.5%;
  }
  
  body {
    background: #fff;
    color: #333;
  
    font-size: var(--body-font-size);
    line-height: 1.5;
  
    max-width: var(--max-page-width);
    margin-left: auto;
    margin-right: auto;
  
    padding: var(--spacing);
  }
  
  /*
  Spacing.
  ==================================================
  */
  
  p,
  dl,
  hr,
  h1,
  h2,
  h3,
  h4,
  h5,
  h6,
  ol,
  ul,
  pre,
  table,
  address,
  fieldset,
  figure,
  blockquote {
    margin: 0;
    margin-bottom: var(--spacing);
  }
  
  /*
  Links.
  ==================================================
  */
  
  a:not([class]) {
    color: #00f;
    text-decoration: none;
  }
  
  a:not([class]):hover {
    text-decoration: underline;
  }
  
  /*
  Disabled state.
  ==================================================
  */
  
  [disabled] {
    cursor: not-allowed;
    opacity: 0.5;
  }
  
  /*
  Pointer cursor.
  ==================================================
  */
  
  a:not([disabled]),
  button:not([disabled]),
  input[type="button"]:not([disabled]),
  input[type="reset"]:not([disabled]),
  input[type="submit"]:not([disabled]) {
    cursor: pointer;
  }
  
  /*
  Images.
  ==================================================
  */
  
  img,
  video {
    max-width: 100%;
    height: auto;
  }
  
  figure img {
    display: block;
    width: 100%;
  }
  
  figcaption {
    color: #999;
  }
  
  /*
  Horizontal rule.
  ==================================================
  */
  
  hr {
    border: 0;
    border-top: 1px solid #ccc;
  }
  
  /*
  Header: Nav.
  ==================================================
  */
  
  header nav > ul {
    font-size: 0;
    padding: 0;
  }
  
  header nav > ul > li {
    display: inline-block;
    font-size: 1.6rem;
  }
  
  header nav > ul > li + li {
    border-left: 1px solid #ccc;
    margin-left: 1rem;
    padding-left: 1rem;
  }
  
  /*
  Headings.
  ==================================================
  */
  
  h1 {
    font-size: 220%;
  }
  
  h2 {
    font-size: 200%;
  }
  
  h3 {
    font-size: 180%;
  }
  
  h4 {
    font-size: 160%;
  }
  
  h5 {
    font-size: 140%;
  }
  
  h6 {
    font-size: 120%;
  }
  
  /*
  Blockquote.
  ==================================================
  */
  
  blockquote {
    border-left: 5px solid #eee;
    padding-top: var(--spacing);
    padding-left: var(--spacing);
    position: relative;
    overflow: hidden;
  }
  
  blockquote::before,
  blockquote::after {
    content: "";
    background: #eee;
  
    width: 5px;
    height: 5px;
  
    position: absolute;
    left: 0;
  }
  
  blockquote::before {
    top: 0;
  }
  
  blockquote::after {
    bottom: 0;
  }
  
  /*
  Code blocks.
  ==================================================
  */
  
  code {
    font-family: "Courier", monospace;
  }
  
  pre {
    background: #eee;
    overflow: auto;
    padding: 1rem;
  }
  
  /*
  Tables.
  ==================================================
  */
  
  table {
    width: 100%;
  }
  
  th,
  td {
    padding: 0.5rem 0.25rem;
    text-align: left;
    vertical-align: top;
  }
  
  :not(thead) > tr > th,
  :not(thead) > tr > td {
    border-top: 1px solid #ccc;
  }
  
  tbody:first-child > tr > th,
  tbody:first-child > tr > td {
    border-top: 0;
  }
  
  table table,
  table table th,
  table table td {
    margin: 0;
    padding: 0;
  }
  
  /*
  Form elements.
  ==================================================
  */
  
  /* Buttons. */
  button,
  input[type="button"],
  input[type="reset"],
  input[type="submit"],
  /* Inputs. */
  input[type="date"],
  input[type="datetime"],
  input[type="datetime-local"],
  input[type="email"],
  input[type="month"],
  input[type="number"],
  input[type="password"],
  input[type="search"],
  input[type="tel"],
  input[type="text"],
  input[type="time"],
  input[type="url"],
  input[type="week"],
  select,
  textarea {
    -webkit-appearance: none;
    border-radius: 4px;
  }
  
  /*
  Buttons.
  ==================================================
  */
  
  button,
  input[type="button"],
  input[type="reset"],
  input[type="submit"] {
    background: #666;
    border: 0;
    color: #fff;
    padding: 0.5rem 1rem;
  }
  
  /*
  Inputs.
  ==================================================
  */
  
  input[type="date"],
  input[type="datetime"],
  input[type="datetime-local"],
  input[type="email"],
  input[type="month"],
  input[type="number"],
  input[type="password"],
  input[type="search"],
  input[type="tel"],
  input[type="text"],
  input[type="time"],
  input[type="url"],
  input[type="week"],
  select,
  textarea {
    background-color: #fff;
    border: 1px solid #333;
    height: 3rem;
    padding-left: 0.5rem;
    padding-right: 0.5rem;
    width: 100%;
  }
  
  input[disabled][type="date"],
  input[disabled][type="datetime"],
  input[disabled][type="datetime-local"],
  input[disabled][type="email"],
  input[disabled][type="month"],
  input[disabled][type="number"],
  input[disabled][type="password"],
  input[disabled][type="search"],
  input[disabled][type="tel"],
  input[disabled][type="text"],
  input[disabled][type="time"],
  input[disabled][type="url"],
  input[disabled][type="week"],
  select[disabled],
  textarea[disabled] {
    background-color: #eee;
  }
  
  textarea {
    min-height: 6rem;
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
  }
  
  textarea[disabled] {
    resize: none;
  }
  
  /*
    Add a "down" arrow to
    `<select>` in Webkit.
  */
  @media (-webkit-min-device-pixel-ratio: 0) {
    select {
      background-image: url(data:image/png;base64,R0lGODlhDQAEAIAAAAAAAP8A/yH5BAEHAAEALAAAAAANAAQAAAILhA+hG5jMDpxvhgIAOw==);
      background-repeat: no-repeat;
      background-position: right center;
    }
  }
  
  /*
  Radios & Checkboxes.
  ==================================================
  */
  
  input[type="checkbox"],
  input[type="radio"] {
    margin-right: 0.5rem;
  }
  
  /*
  Fieldset.
  ==================================================
  */
  
  fieldset {
    border: 1px solid #ccc;
    padding-top: var(--spacing);
    padding-left: var(--spacing);
    padding-right: var(--spacing);
    padding-bottom: 0;
  }
  
  legend {
    margin-left: -0.5rem;
    padding-left: 0.5rem;
    padding-right: 0.5rem;
  }
