html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji",
    "Segoe UI Symbol";
  font-size: 16px;
  line-height: 1.6;
}

body {
  margin: 0;
  background-color: white;
  padding: 0 2em;
}

p {
  margin: 1.5em 0;
}

.intro {
  box-sizing: border-box;
  width: 100%;
  margin: 0 0 1.5em 0;
  padding: 1em 0;
  border-bottom: 1px solid #999;
  position: relative;
}

.intro h1 {
  margin: 0 0 0.5em 0;
}

.intro p {
  margin: 0;
}

.interface {
  display: flex;
  flex-wrap: wrap;
  width: 100%;
}

.interface .controls {
  box-sizing: border-box;
  width: 300px;
  flex-shrink: 0;
  padding: 1em;
}

.interface .preview {
  box-sizing: border-box;
  flex: 1;
  padding: 1em;
}

.controls fieldset {
  margin-bottom: 1em;
  border: 1px solid #ccc;
}

.controls legend {
  font-weight: bold;
  padding: 0 0.5em;
}

.controls label {
  display: block;
  margin-bottom: 0.5em;
}

.controls label > span {
  display: block;
  font-weight: normal;
  margin-bottom: 0.25em;
}

.controls input[type="range"],
.controls select,
.controls textarea {
  width: 100%;
  box-sizing: border-box;
  font-size: 1em;
}

.controls textarea {
  min-height: 4em;
  font-family: inherit;
  resize: vertical;
}

.controls input[type="range"] {
  margin-top: 0.25em;
}

.controls button {
  width: 100%;
  padding: 0.5em 1em;
  font-size: 1em;
  margin-bottom: 0.5em;
  cursor: pointer;
}

#preview-pages {
  display: flex;
  flex-wrap: wrap;
  background-color: #eee;
  margin: 1em -1em;
  padding: 0.5em;
  min-height: 200px;
}

.page-thumbnail {
  width: 250px;
  margin: 0.5em;
  background-color: white;
  border: 1px solid #ccc;
  position: relative;
  box-sizing: border-box;
}

.page-thumbnail svg {
  width: 100%;
  height: auto;
  display: block;
}

.page-thumbnail .delete-btn {
  position: absolute;
  top: 4px;
  right: 4px;
  background-color: rgba(255, 255, 255, 0.9);
  border: 1px solid #999;
  padding: 0.25em 0.5em;
  cursor: pointer;
  font-size: 0.8em;
}

.page-thumbnail .delete-btn:hover {
  background-color: #ff6b6b;
  color: white;
}

.activity-params {
  display: none;
}

.activity-params.active {
  display: block;
}

/* Header nav and settings dropdown */

.intro h1 a {
  color: inherit;
  text-decoration: none;
}

.header-nav {
  position: absolute;
  top: 1em;
  right: 0;
  display: flex;
  align-items: center;
  gap: 1em;
  font-size: 0.9em;
}

.header-nav > a {
  color: #333;
}

.header-settings {
  position: relative;
}

.header-settings-toggle,
#header-settings-toggle {
  background: none;
  border: 1px solid #ccc;
  border-radius: 3px;
  padding: 0.25em 0.4em;
  cursor: pointer;
  display: flex;
  align-items: center;
  color: #333;
}

#header-settings-toggle:hover {
  background-color: #eee;
}

#header-settings-toggle svg {
  display: block;
}

.header-dropdown {
  display: none;
  position: absolute;
  right: 0;
  top: calc(100% + 4px);
  background: white;
  border: 1px solid #ccc;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  padding: 0.75em 1em;
  min-width: 200px;
  z-index: 100;
  white-space: nowrap;
}

.header-dropdown.open {
  display: block;
}

.header-dropdown label {
  display: flex;
  align-items: center;
  gap: 0.5em;
  margin-bottom: 0.5em;
  cursor: pointer;
  font-size: 0.95em;
}

.header-dropdown label input[type="checkbox"] {
  margin: 0;
}

.header-dropdown hr {
  border: none;
  border-top: 1px solid #ddd;
  margin: 0.5em 0;
}

#header-account {
  font-size: 0.95em;
}

#header-account a {
  color: #333;
}

/* Content pages (about, faq) */

.content-page {
  max-width: 700px;
}

.content-page h2 {
  margin-top: 0;
}

/* Login / account page */

.login-container {
  max-width: 400px;
}

.login-container label {
  display: block;
  margin-bottom: 0.5em;
}

.login-container label > span {
  display: block;
  margin-bottom: 0.25em;
}

.login-container input[type="email"],
.login-container input[type="text"] {
  width: 100%;
  padding: 0.5em;
  font-size: 1em;
  border: 1px solid #ccc;
  border-radius: 3px;
  box-sizing: border-box;
}

.login-container button {
  padding: 0.5em 1em;
  font-size: 1em;
  cursor: pointer;
}

.login-container button[type="submit"] {
  width: 100%;
  margin-top: 0.5em;
}

.login-container .link-btn {
  background: none;
  border: none;
  color: #333;
  text-decoration: underline;
  padding: 0;
  font-size: 0.9em;
  cursor: pointer;
}

.login-container .secondary-btn {
  margin-top: 1em;
  background: none;
  border: 1px solid #ccc;
}

.error {
  color: #c00;
}

/* Mobile responsiveness */
@media (max-width: 600px) {
  body {
    padding: 0 0.5em;
  }

  .interface {
    flex-direction: column;
  }

  .interface .controls {
    width: 100%;
  }

  .header-nav {
    position: static;
    margin-top: 0.75em;
    justify-content: flex-end;
  }
}