/* The AI Work Pack — sales page candidate
   System type, black/white, one blue action colour. No external assets. */

:root {
  --ink: #0b0b0c;
  --ink-2: #2f3237;
  --muted: #5b5f67;
  --line: #e4e6ea;
  --soft: #f6f7f8;
  --paper: #ffffff;
  --blue: #0a5cff;
  --blue-press: #0047d6;
  --blue-tint: #eaf1ff;
  --blue-ink: #0a3fb0;

  --sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --gutter: 20px;
  --section: 56px;
  --radius: 14px;
}

@media (min-width: 768px) {
  :root { --gutter: 32px; --section: 96px; }
}

*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: 16px;
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, p, ul, ol, dl, dd, figure, pre { margin: 0; }
ul[role="list"], ol.steps { list-style: none; padding: 0; }
a { color: inherit; }

.wrap {
  width: 100%;
  max-width: 1184px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.mono { font-family: var(--mono); font-size: 0.92em; letter-spacing: 0; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip {
  position: absolute;
  left: 12px; top: -48px;
  z-index: 20;
  padding: 8px 14px;
  background: var(--paper);
  color: var(--ink);
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
}
.skip:focus { top: 8px; }

/* ---------- Header ---------- */

.site-head {
  background: #000;
  color: #fff;
}
.site-head-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 52px;
}
.brand {
  text-decoration: none;
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.02em;
  white-space: nowrap;
}
.brand-dot {
  display: inline-block;
  width: 6px; height: 6px;
  margin-left: 2px;
  border-radius: 50%;
  background: var(--blue);
  vertical-align: baseline;
}
.preview-tag {
  font-size: 12px;
  line-height: 1;
  color: #b4b8bf;
  text-decoration: none;
  border: 1px solid #34373d;
  border-radius: 999px;
  padding: 6px 10px;
  white-space: nowrap;
}
.preview-tag:hover { color: #fff; border-color: #5a5e66; }
.site-head :focus-visible { outline-color: #fff; }
.preview-long { display: none; }
@media (min-width: 768px) { .preview-long { display: inline; } }

/* ---------- Hero ---------- */

.hero {
  padding-block: 28px 48px;
}
@media (min-width: 960px) {
  .hero { padding-block: 72px 80px; }
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas:
    "copy"
    "specs"
    "peek";
  row-gap: 28px;
}
@media (min-width: 960px) {
  .hero-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    grid-template-areas:
      "copy peek"
      "specs specs";
    column-gap: 72px;
    row-gap: 64px;
    align-items: center;
  }
}
.hero-copy { grid-area: copy; }
.specs { grid-area: specs; }
.peek { grid-area: peek; }

.eyebrow,
.kicker {
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--muted);
}

h1 {
  margin-top: 8px;
  font-size: clamp(2.375rem, 1.5rem + 3.6vw, 4.125rem);
  line-height: 1;
  font-weight: 800;
  letter-spacing: -0.045em;
}

.dek {
  margin-top: 14px;
  max-width: 34em;
  font-size: clamp(1.0625rem, 0.98rem + 0.35vw, 1.25rem);
  line-height: 1.5;
  color: var(--ink-2);
  text-wrap: pretty;
}

.buy { margin-top: 22px; }
@media (min-width: 960px) { .buy { margin-top: 32px; } }

.price-row {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  column-gap: 10px;
  margin-bottom: 12px;
}
.price {
  font-size: 2rem;
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}
.price-note {
  font-size: 14px;
  color: var(--muted);
}

.buy-meta {
  margin-top: 12px;
  max-width: 30em;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 26px;
  border: 0;
  border-radius: 10px;
  font: inherit;
  font-size: 17px;
  font-weight: 650;
  letter-spacing: -0.005em;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s ease, box-shadow 0.15s ease;
}
.btn-primary {
  background: var(--blue);
  color: #fff;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.08), 0 6px 16px -8px rgba(10, 92, 255, 0.6);
}
.btn-primary:hover { background: var(--blue-press); }
.btn-primary:active { background: #003bb3; }

.hero .btn-primary { width: 100%; }
@media (min-width: 560px) {
  .hero .btn-primary { width: auto; min-width: 280px; }
}

.btn-quiet {
  min-height: 40px;
  padding: 0 14px;
  font-size: 14px;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid #c9ccd2;
  border-radius: 8px;
  flex-shrink: 0;
}
.btn-quiet:hover { border-color: var(--ink); }

.btn-small {
  min-height: 44px;
  padding: 0 18px;
  font-size: 15px;
}

/* ---------- Spec strip ---------- */

.specs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}
.specs li {
  padding: 14px 8px 12px 0;
  border-bottom: 1px solid var(--line);
}
.specs li:nth-child(n + 4) { border-bottom: 0; }
.specs .n {
  display: block;
  font-size: 1.5rem;
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}
.specs .l {
  display: block;
  margin-top: 3px;
  font-size: 13px;
  line-height: 1.3;
  color: var(--muted);
}
@media (min-width: 960px) {
  .specs { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .specs li { padding: 20px 16px 0 0; border-bottom: 0; }
  .specs .n { font-size: 2.25rem; }
  .specs .l { font-size: 14px; }
}

/* ---------- Prompt peek (hero visual) ---------- */

.peek {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 28px 56px -32px rgba(0, 0, 0, 0.28);
}
.peek-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px;
  background: var(--soft);
  border-bottom: 1px solid var(--line);
  font-size: 12.5px;
  color: var(--muted);
}
.badge {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--ink);
  color: #fff;
  font-size: 11.5px;
  font-weight: 600;
  line-height: 1.3;
  white-space: nowrap;
}
.peek-title {
  padding: 16px 18px 6px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
}
.peek-body {
  position: relative;
  max-height: 232px;
  overflow: hidden;
}
@media (min-width: 960px) {
  .peek-body { max-height: 318px; }
}
.peek-body::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 96px;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0), #fff 88%);
  pointer-events: none;
}
.peek-text,
.prompt-text {
  font-family: var(--mono);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  color: var(--ink-2);
}
.peek-text {
  padding: 6px 18px 0;
  font-size: 12.5px;
  line-height: 1.65;
}
@media (min-width: 960px) {
  .peek-text { font-size: 13px; }
}
.ph {
  background: var(--blue-tint);
  color: var(--blue-ink);
  border-radius: 4px;
  padding: 0 3px;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}
.peek-foot {
  padding: 4px 18px 16px;
  font-size: 14.5px;
  font-weight: 600;
}
.peek-foot a {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
.peek-foot a:hover { color: var(--blue); }

/* ---------- Sections ---------- */

.section {
  padding-block: var(--section);
  border-top: 1px solid var(--line);
}
.section-soft {
  background: var(--soft);
}

.section-head {
  display: grid;
  gap: 12px;
  margin-bottom: 28px;
}
@media (min-width: 960px) {
  .section-head {
    grid-template-columns: 5fr 6fr;
    column-gap: 72px;
    align-items: end;
    margin-bottom: 48px;
  }
}

h2 {
  margin-top: 8px;
  font-size: clamp(1.625rem, 1.15rem + 1.8vw, 2.625rem);
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -0.035em;
  text-wrap: balance;
}
.section-intro {
  max-width: 36em;
  color: var(--ink-2);
  font-size: 16.5px;
  text-wrap: pretty;
}

.mini-label {
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- Tasks ---------- */

.tasks {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}
@media (min-width: 640px) {
  .tasks { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
}
@media (min-width: 960px) {
  .tasks { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
}
.task {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--paper);
}
@media (min-width: 960px) {
  .task { padding: 22px 24px; min-height: 132px; }
}
.task-meta {
  font-size: 13px;
  color: var(--muted);
}
.task-meta .mono {
  color: var(--ink);
  font-weight: 600;
  margin-right: 6px;
}
.task-title {
  font-size: 17px;
  line-height: 1.3;
  font-weight: 650;
  letter-spacing: -0.012em;
  text-wrap: pretty;
}
@media (min-width: 960px) {
  .task-title { font-size: 19px; }
}

.areas-block { margin-top: 32px; }
@media (min-width: 960px) { .areas-block { margin-top: 48px; } }
.areas {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}
.areas li {
  padding: 5px 11px;
  font-size: 13.5px;
  line-height: 1.35;
  border-radius: 999px;
  background: var(--soft);
  color: var(--ink-2);
}

/* ---------- Sample ---------- */

.sample {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
}
.sample-head {
  padding: 20px 20px 18px;
  border-bottom: 1px solid var(--line);
}
@media (min-width: 768px) {
  .sample-head { padding: 28px 32px 24px; }
}
.sample-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  font-size: 13px;
  color: var(--muted);
}
.sample h3 {
  margin-top: 10px;
  font-size: clamp(1.25rem, 1.05rem + 0.8vw, 1.625rem);
  line-height: 1.2;
  font-weight: 750;
  letter-spacing: -0.02em;
}
.sample-situation {
  margin-top: 8px;
  color: var(--ink-2);
}
.mini-inline {
  display: inline-block;
  margin-right: 6px;
  font-size: 11.5px;
  font-weight: 650;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--muted);
}

.sample-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}
.sample-col {
  padding: 20px;
}
.sample-col + .sample-col { border-top: 1px solid var(--line); }
@media (min-width: 768px) {
  .sample-col { padding: 26px 32px; }
}
@media (min-width: 1024px) {
  .sample-grid { grid-template-columns: 1fr 1.3fr 1.1fr; }
  .sample-col + .sample-col { border-top: 0; border-left: 1px solid var(--line); }
}

.inputs { margin-top: 10px; }
.inputs li {
  padding: 7px 0;
  font-size: 15px;
  line-height: 1.4;
  border-bottom: 1px dashed var(--line);
}
.inputs li:last-child { border-bottom: 0; }

.steps {
  margin-top: 12px;
  counter-reset: step;
  display: grid;
  gap: 12px;
}
.steps li {
  counter-increment: step;
  position: relative;
  padding-left: 34px;
  font-size: 15px;
  line-height: 1.45;
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0; top: 0;
  width: 22px; height: 22px;
  display: grid;
  place-items: center;
  border-radius: 6px;
  background: var(--ink);
  color: #fff;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
}

.guards { margin-top: 12px; }
.guards dt {
  font-size: 14px;
  font-weight: 700;
}
.guards dd {
  margin: 2px 0 14px;
  font-size: 15px;
  line-height: 1.45;
  color: var(--ink-2);
}
.guards dd:last-child { margin-bottom: 0; }

/* Details (shared) */
details > summary {
  list-style: none;
  cursor: pointer;
}
details > summary::-webkit-details-marker { display: none; }

.plus {
  position: relative;
  flex-shrink: 0;
  width: 14px; height: 14px;
}
.plus::before,
.plus::after {
  content: "";
  position: absolute;
  left: 0; top: 6px;
  width: 14px; height: 2px;
  border-radius: 1px;
  background: currentColor;
  transition: transform 0.18s ease;
}
.plus::after { transform: rotate(90deg); }
details[open] > summary .plus::after { transform: rotate(0deg); }

.full { border-top: 1px solid var(--line); }
.full > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  font-weight: 650;
}
.full > summary:hover { background: var(--soft); }
.full > summary:focus-visible { outline-offset: -3px; border-radius: 0; }
@media (min-width: 768px) {
  .full > summary { padding: 18px 32px; }
}
.full-body { padding: 0 20px 20px; }
@media (min-width: 768px) {
  .full-body { padding: 0 32px 28px; }
}
.full-tools {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}
.full-hint {
  font-size: 14px;
  color: var(--muted);
}
.prompt-text {
  padding: 16px;
  font-size: 13px;
  line-height: 1.65;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 10px;
}
@media (min-width: 768px) {
  .prompt-text { padding: 22px 24px; font-size: 13.5px; }
}
.copy-status {
  min-height: 1.4em;
  margin-top: 8px;
  font-size: 13.5px;
  color: var(--muted);
}

/* ---------- Bundle ---------- */

.bundle-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
}
@media (min-width: 960px) {
  .bundle-grid {
    grid-template-columns: 6fr 5fr;
    column-gap: 72px;
    align-items: start;
  }
}

.receipt {
  margin-top: 24px;
  padding: 20px 20px 18px;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
}
@media (min-width: 768px) {
  .receipt { margin-top: 32px; padding: 26px 30px 22px; }
}
.receipt-name {
  padding-bottom: 12px;
  font-size: 15px;
  font-weight: 750;
  letter-spacing: -0.01em;
  border-bottom: 1px solid var(--line);
}
.row {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  padding: 11px 0;
  font-size: 15.5px;
  line-height: 1.35;
}
.row::after {
  content: "";
  order: 2;
  flex: 1 1 auto;
  min-width: 16px;
  margin-bottom: 5px;
  border-bottom: 1px dotted #b9bdc4;
}
.row dt { order: 1; color: var(--ink-2); }
.row dd {
  order: 3;
  max-width: 58%;
  text-align: right;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.row.total {
  margin-top: 6px;
  padding-top: 14px;
  border-top: 2px solid var(--ink);
}
.row.total dt { font-weight: 700; color: var(--ink); }
.row.total dd { font-size: 1.375rem; letter-spacing: -0.02em; }
.receipt-note {
  font-size: 13.5px;
  color: var(--muted);
  text-align: right;
}

.fit {
  display: grid;
  gap: 28px;
}
@media (min-width: 960px) {
  .fit { padding-top: 8px; }
}
.fit h3 {
  font-size: 18px;
  font-weight: 750;
  letter-spacing: -0.015em;
  line-height: 1.3;
}
.ticks,
.crosses {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}
.ticks li,
.crosses li {
  position: relative;
  padding-left: 28px;
  font-size: 15.5px;
  line-height: 1.45;
  color: var(--ink-2);
}
.ticks li::before,
.crosses li::before {
  content: "";
  position: absolute;
  left: 2px; top: 4px;
  width: 16px; height: 16px;
  border-radius: 50%;
}
.ticks li::before {
  background: var(--ink);
}
.ticks li::after {
  content: "";
  position: absolute;
  left: 7px; top: 7px;
  width: 4px; height: 8px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}
.crosses li::before {
  border: 1.5px solid #9a9ea6;
}
.crosses li::after {
  content: "";
  position: absolute;
  left: 6px; top: 11px;
  width: 8px; height: 1.5px;
  background: #9a9ea6;
}
.fit-not {
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.free-note {
  padding: 14px 16px;
  border-radius: 10px;
  background: var(--soft);
  font-size: 15px;
  color: var(--ink-2);
}
.free-note strong { color: var(--ink); }

/* ---------- FAQ + support ---------- */

.faq-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}
@media (min-width: 960px) {
  .faq-grid {
    grid-template-columns: 5fr 6fr;
    column-gap: 72px;
    align-items: start;
  }
}

.support {
  margin-top: 24px;
  padding: 20px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
@media (min-width: 768px) {
  .support { margin-top: 32px; padding: 24px 28px; }
}
.support dt {
  font-size: 14px;
  font-weight: 700;
}
.support dd {
  margin: 2px 0 16px;
  font-size: 15px;
  line-height: 1.45;
  color: var(--ink-2);
}
.support dd:last-child { margin-bottom: 0; }

.faq {
  border-top: 1px solid #d6d9de;
}
@media (min-width: 960px) {
  .faq { margin-top: 30px; }
}
.faq details { border-bottom: 1px solid #d6d9de; }
.faq summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
  font-size: 16.5px;
  font-weight: 650;
  line-height: 1.35;
  letter-spacing: -0.01em;
}
.faq summary:hover { color: var(--blue-press); }
.faq-a {
  padding: 0 32px 20px 0;
  max-width: 40em;
  color: var(--ink-2);
}

/* ---------- Closing ---------- */

.closing {
  background: #000;
  color: #fff;
  padding-block: 48px;
}
@media (min-width: 768px) {
  .closing { padding-block: 72px; }
}
.closing-inner {
  display: grid;
  gap: 24px;
}
@media (min-width: 768px) {
  .closing-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    column-gap: 48px;
  }
}
.closing h2 {
  margin-top: 0;
  max-width: 18em;
}
.closing p {
  margin-top: 10px;
  color: #b4b8bf;
}
.closing .btn-primary { width: 100%; box-shadow: none; }
@media (min-width: 560px) {
  .closing .btn-primary { width: auto; min-width: 280px; }
}
.closing :focus-visible { outline-color: #fff; }

/* ---------- Footer ---------- */

.site-foot {
  padding-block: 28px 40px;
  font-size: 13px;
  color: var(--muted);
}
.site-foot .wrap {
  display: grid;
  gap: 8px;
}
@media (min-width: 768px) {
  .site-foot .wrap { grid-template-columns: auto minmax(0, 1fr); column-gap: 48px; }
}
.foot-brand {
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.preview-note { max-width: 62em; }
.preview-note:target {
  outline: 2px solid var(--blue);
  outline-offset: 6px;
  border-radius: 4px;
}

/* ---------- Mobile buy bar ---------- */

.buybar {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px var(--gutter) calc(10px + env(safe-area-inset-bottom, 0px));
  background: rgba(255, 255, 255, 0.97);
  border-top: 1px solid var(--line);
  box-shadow: 0 -8px 24px -16px rgba(0, 0, 0, 0.25);
  transform: translateY(110%);
  visibility: hidden;
  transition: transform 0.2s ease, visibility 0s linear 0.2s;
}
.buybar.is-visible {
  transform: none;
  visibility: visible;
  transition: transform 0.2s ease;
}
.buybar[hidden] { display: none; }
@supports ((-webkit-backdrop-filter: blur(1px)) or (backdrop-filter: blur(1px))) {
  .buybar {
    background: rgba(255, 255, 255, 0.88);
    -webkit-backdrop-filter: saturate(1.4) blur(12px);
    backdrop-filter: saturate(1.4) blur(12px);
  }
}
.buybar-text {
  display: grid;
  min-width: 0;
  line-height: 1.25;
}
.buybar-name {
  font-size: 14.5px;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.buybar-price {
  font-size: 12.5px;
  color: var(--muted);
}
@media (min-width: 960px) {
  .buybar { display: none !important; }
}

/* ---------- Motion ---------- */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0s !important;
    transition-delay: 0s !important;
    animation: none !important;
  }
}

/* ---------- Forced colours ---------- */

@media (forced-colors: active) {
  .btn-primary, .badge, .steps li::before { border: 1px solid CanvasText; }
  .peek-body::after { display: none; }
}

/* Respect progressive-enhancement controls when JavaScript is unavailable. */
.btn[hidden] { display: none; }