:root {
  --bg: #f0f9ff;
  --ink: #0c4a6e;
  --mute: #0369a1;
  --faint: #7dd3fc;
  --line: #bae6fd;
  --card: #ffffff;
  --hit: #0284c7;
  --bad: #dc2626;
  --bad-wash: #fef2f2;
  --sans: 'Instrument Sans', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font: 400 16px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
  background:
    radial-gradient(700px 420px at 90% -10%, rgba(56, 189, 248, 0.2), transparent 55%),
    linear-gradient(180deg, #f8fcff 0%, var(--bg) 45%, #e0f2fe 100%);
}
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--hit); outline-offset: 3px; }

.page {
  width: min(560px, calc(100% - 40px));
  margin: 0 auto;
  padding: 32px 0 96px;
}

.bar {
  display: flex;
  justify-content: space-between;
  margin-bottom: 48px;
  font: 500 12px/1 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #67a8cf;
}
.bar a { color: var(--mute); text-decoration: none; }

.hero { margin-bottom: 32px; }
.hero h1 {
  margin: 0;
  font-size: clamp(44px, 10vw, 56px);
  font-weight: 700;
  letter-spacing: -0.05em;
  line-height: 0.95;
}
.hero p { margin: 14px 0 0; max-width: 34ch; color: var(--mute); font-size: 17px; }

.composer { display: grid; gap: 16px; }

.field-label,
label.field > span.field-label {
  display: block;
  margin-bottom: 8px;
  font: 600 13px/1 var(--sans);
  letter-spacing: -0.01em;
  color: var(--ink);
}

label span {
  display: block;
  margin-bottom: 6px;
  font: 500 11px/1 var(--mono);
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: #67a8cf;
}
label span em { font-style: normal; text-transform: none; letter-spacing: 0; color: #93c5fd; }

input[type='url'],
input[type='text'] {
  width: 100%;
  padding: 13px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card);
  font: 500 15px/1.4 var(--sans);
  color: var(--ink);
  transition: border-color 0.15s, box-shadow 0.15s;
}
input::placeholder { color: #94a3b8; }
input:focus { outline: none; border-color: var(--hit); box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.12); }

.focus-block {
  padding: 16px 16px 14px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, #ffffff 0%, #f8fcff 100%);
}

.focus-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.focus-title {
  font: 600 14px/1.2 var(--sans);
  letter-spacing: -0.02em;
  color: var(--ink);
}

.focus-badge {
  padding: 3px 8px;
  border-radius: 999px;
  background: #e0f2fe;
  border: 1px solid #bae6fd;
  font: 500 10px/1 var(--mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #0284c7;
}

.focus-desc {
  margin: 0 0 12px;
  font-size: 13px;
  line-height: 1.45;
  color: #64748b;
}

.focus-block input[type='text'] {
  border-color: #dbeafe;
  background: #fff;
  padding: 12px 13px;
  font-size: 14.5px;
}

.focus-block input[type='text']:focus {
  border-color: var(--hit);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.18);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.chips button {
  border: 1px solid #dbeafe;
  background: #fff;
  padding: 7px 12px;
  border-radius: 999px;
  font: 600 12.5px/1 var(--sans);
  color: #0369a1;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s, transform 0.1s;
}
.chips button:hover {
  border-color: #7dd3fc;
  background: #f0f9ff;
  color: var(--ink);
}
.chips button:active { transform: scale(0.98); }
.chips button.active {
  border-color: var(--ink);
  background: var(--ink);
  color: #f0f9ff;
}

.check {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--mute);
}
.check input { width: auto; accent-color: var(--hit); flex-shrink: 0; }

button[type='submit'] {
  border: 0;
  padding: 14px 16px;
  border-radius: 12px;
  background: var(--ink);
  color: #f0f9ff;
  font: 600 15px/1 var(--sans);
  cursor: pointer;
}
button[type='submit']:disabled { opacity: 0.55; cursor: progress; }

.hint { margin: 0; color: #67a8cf; font-size: 13px; }
.err {
  margin: 12px 0;
  padding: 14px 16px;
  border-radius: 12px;
  background: var(--bad-wash);
  border: 1px solid #fecaca;
  color: #991b1b;
  font-size: 14px;
  line-height: 1.5;
}
.err strong {
  display: block;
  font-weight: 600;
  color: var(--bad);
  margin-bottom: 4px;
}
.err span {
  display: block;
  color: #b91c1c;
  font-size: 13px;
}

.out {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
  animation: rise 0.4s ease both;
}
.meta h2 {
  margin: 0 0 8px;
  font-size: 22px;
  letter-spacing: -0.03em;
  line-height: 1.2;
}
.fine { margin: 0; color: var(--mute); font-size: 14px; }
.focusTag {
  display: inline-block;
  margin: 10px 0 0;
  padding: 6px 10px;
  border-radius: 999px;
  background: #e0f2fe;
  border: 1px solid var(--line);
  font: 600 12px/1 var(--mono);
  color: var(--hit);
}

.block { margin-top: 24px; }
.block h3 {
  margin: 0 0 10px;
  font: 600 12px/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #67a8cf;
}
.block p { margin: 0; color: var(--ink); font-size: 16px; line-height: 1.55; }
.block ul { margin: 0; padding-left: 1.2em; color: var(--ink); }
.block li { margin: 8px 0; line-height: 1.45; }

.foot {
  margin-top: 24px;
  font: 500 12px/1.5 var(--mono);
  color: #67a8cf;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 520px) {
  .page { width: min(100% - 32px, 560px); }
}