:root {
  --bg: #f5f6f8;
  --panel: #ffffff;
  --ink: #1f2937;
  --muted: #6b7280;
  --line: #d1d5db;
  --accent: #2563eb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--ink);
  background: var(--bg);
}

.container {
  width: min(920px, 94vw);
  margin: 20px auto;
}

h1,
h2,
h3 {
  margin: 0;
  font-weight: 700;
}

h1 {
  margin-bottom: 14px;
  font-size: 1.4rem;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  padding: 14px;
}

#http-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.top-row {
  display: grid;
  grid-template-columns: 150px 1fr 110px;
  gap: 8px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.field span {
  font-size: 0.85rem;
  color: var(--muted);
}

input,
select,
textarea,
button {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px;
  font: inherit;
  color: var(--ink);
  background: #fff;
}

input:focus,
select:focus,
textarea:focus,
button:focus {
  outline: 2px solid #93c5fd;
  outline-offset: 1px;
}

textarea {
  min-height: 180px;
  resize: vertical;
}

.send-btn {
  align-self: end;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}

.small-btn {
  width: 36px;
  height: 36px;
  padding: 0;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  line-height: 1;
}

.headers-section {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.headers-title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.headers-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.header-row {
  display: grid;
  grid-template-columns: 1fr 1fr 44px;
  gap: 6px;
}

.response-panel {
  margin-top: 12px;
}

.status {
  margin-top: 8px;
  font-weight: 700;
}

.response-block {
  margin-top: 10px;
}

pre {
  margin: 6px 0 0;
  background: #f9fafb;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  max-height: 320px;
  overflow: auto;
}

@media (max-width: 760px) {
  .top-row {
    grid-template-columns: 1fr;
  }

  .send-btn {
    width: 100%;
  }

  .header-row {
    grid-template-columns: 1fr;
  }

  .small-btn {
    width: 100%;
  }
}