/*
	Layout and styling, modeled on the main page (HTML5 UP Hyperspace).
	Colors are in palette.css.
*/

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html { font-size: 16px; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
}

body, input, select, textarea, button {
  color: var(--color-text);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 1rem;
  line-height: 1.75;
}

a {
  color: inherit;
  text-decoration: none;
  border-bottom: dotted 1px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

a:hover { color: var(--color-text-strong); border-bottom-color: transparent; }

h1, h2 {
  margin: 0 0 0.5em;
  color: var(--color-text-strong);
  font-weight: bold;
  line-height: 1.5;
}

/* =========================================================
   HEADER
   ========================================================= */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1em;
  padding: 1.5em 2em;
  background: var(--color-bg);
}

.header__title {
  color: var(--color-text-strong);
  font-size: 1.25em;
  font-weight: bold;
  border: 0;
}

.header__link {
  color: var(--color-text-light);
  font-size: 0.7em;
  font-weight: bold;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  border: 0;
}

.header__link:hover { color: var(--color-text-strong); }

@media (max-width: 600px) {
  .header { padding: 1.25em 1em; }
  .header__title { font-size: 1.1em; white-space: nowrap; }
  .header__link { font-size: 0.6em; letter-spacing: 0.15em; text-align: right; }
}

/* =========================================================
   MAIN AREA
   ========================================================= */
.app {
  flex: 1;
  background: var(--color-accent1);
  padding: 5em 2em;
}

.app__inner {
  max-width: 68em;
  margin: 0 auto;
}

.intro h1 {
  position: relative;
  margin-bottom: 0.6em;
  padding-bottom: 0.35em;
  font-size: 2.75em;
}

.intro h1::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 0.05em;
  border-radius: 0.2em;
  background: linear-gradient(to right, var(--color-gradient-start), var(--color-gradient-end));
}

.intro p { margin: 0 0 3em; max-width: 42em; }

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 22em);
  gap: 4em;
  align-items: start;
}

@media (max-width: 900px) {
  .app { padding: 3em 1em; }
  .intro h1 { font-size: 2em; }
  .layout { grid-template-columns: minmax(0, 1fr); gap: 3em; }
}

/* =========================================================
   FORM
   ========================================================= */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75em;
  margin-bottom: 2em;
}

.fields { display: grid; gap: 1.5em; }

.field { display: grid; gap: 0.5em; min-width: 0; }

.field > span,
.check span,
.color span {
  color: var(--color-text-strong);
  font-weight: bold;
  line-height: 1.5;
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="number"],
select,
textarea {
  appearance: none;
  width: 100%;
  height: 2.75em;
  padding: 0 1em;
  color: inherit;
  background: var(--color-border-bg);
  border: solid 1px var(--color-border);
  border-radius: 0.25em;
  outline: 0;
}

textarea {
  height: auto;
  padding: 0.75em 1em;
  resize: vertical;
}

input::placeholder,
textarea::placeholder { color: var(--color-text-light); }

input:focus,
select:focus,
textarea:focus {
  border-color: var(--color-text-strong);
  box-shadow: 0 0 0 1px var(--color-text-strong);
}

select {
  padding-right: 2.75em;
  background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='40' height='40' viewBox='0 0 40 40'%3E%3Cpath d='M9.4 12.3l10.4 10.4 10.4-10.4 4.2 4.2-14.6 14.6L5.2 16.5z' fill='rgba(255,255,255,0.35)'/%3E%3C/svg%3E");
  background-size: 1rem;
  background-repeat: no-repeat;
  background-position: calc(100% - 1em) center;
}

select option { color: var(--color-text-strong); background: var(--color-bg); }

.row {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 1.5em 2em;
}

.row .field { flex: 1 1 14em; }

.check,
.color {
  display: flex;
  align-items: center;
  gap: 0.75em;
  cursor: pointer;
}

.check { height: 2.75em; }

.check input { width: 1.1em; height: 1.1em; accent-color: var(--color-text-strong); }

.panel__heading {
  margin: 2.5em 0 1em;
  font-size: 1.1em;
}

.options {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5em;
}

@media (max-width: 600px) {
  .options { grid-template-columns: minmax(0, 1fr); }
}

.colors {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1em 2em;
}

.color input {
  width: 2.75em;
  height: 2.75em;
  padding: 0.25em;
  background: var(--color-border-bg);
  border: solid 1px var(--color-border);
  border-radius: 0.25em;
  cursor: pointer;
}

/* =========================================================
   BUTTONS (the main page's rounded, uppercase buttons)
   ========================================================= */
.btn,
.tab {
  height: calc(4.75em + 2px);
  padding: 0 3em;
  font-size: 0.6rem;
  font-weight: bold;
  line-height: 4.75em;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--color-text-strong);
  background: transparent;
  border: solid 1px var(--color-border);
  border-radius: 3em;
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.tab { padding: 0 2em; }

.btn:hover,
.tab:hover { background: var(--color-border-bg); }

.btn--primary,
.tab[aria-selected="true"] {
  color: var(--color-accent1);
  background: var(--color-text-strong);
  border-color: var(--color-text-strong);
}

.btn--primary:hover,
.tab[aria-selected="true"]:hover { background: color-mix(in srgb, var(--color-text-strong) 85%, transparent); }

.btn--small { height: calc(4em + 2px); line-height: 4em; padding: 0 2em; }

.btn:disabled { opacity: 0.35; cursor: not-allowed; }

/* =========================================================
   PREVIEW
   ========================================================= */
.preview {
  position: sticky;
  top: 2em;
}

@media (max-width: 900px) {
  .preview { position: static; }
}

.preview__frame {
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  border: solid 1px var(--color-border);
  border-radius: 0.25em;
}

.preview__code {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 0.25em;
}

.preview__message {
  margin: 0;
  padding: 0 2em;
  text-align: center;
}

.preview__message.is-error,
.warning { color: var(--color-warning); }

.warning { margin: 1em 0 0; font-size: 0.9em; }

.actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75em;
  margin-top: 1.5em;
}

.actions .btn { padding: 0 1em; }

.actions .btn:last-child:nth-child(odd) { grid-column: 1 / -1; }

.encoded {
  display: grid;
  gap: 0.25em;
  margin-top: 2em;
  font-size: 0.8em;
}

.encoded__label {
  color: var(--color-text-light);
  font-weight: bold;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  font-size: 0.85em;
}

.encoded__text {
  max-height: 8em;
  overflow: auto;
  font-family: "Courier New", monospace;
  white-space: pre-wrap;
  word-break: break-all;
}

/* =========================================================
   FOOTER (same as the main page's)
   ========================================================= */
.footer {
  padding: 2.5em 2em;
  background: var(--color-accent3);
}

.footer .menu {
  display: flex;
  flex-wrap: wrap;
  max-width: 68em;
  margin: 0 auto;
  padding: 0;
  list-style: none;
  font-size: 0.8em;
  color: var(--color-border);
}

.footer .menu li + li {
  margin-left: 1.5em;
  padding-left: 1.5em;
  border-left: solid 1px var(--color-border);
}