:root {
  --bg: #f7f8fb;
  --card: #ffffff;
  --text: #172033;
  --muted: #5d667a;
  --border: #dfe4ee;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --soft: #eef4ff;
  --success: #11845b;
  --shadow: 0 18px 45px rgba(28, 41, 68, 0.08);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top left, #e9f1ff 0, transparent 34%),
              linear-gradient(180deg, #ffffff 0%, var(--bg) 46%, #ffffff 100%);
  line-height: 1.6;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
.site-header {
  border-bottom: 1px solid rgba(223, 228, 238, 0.8);
  background: rgba(255, 255, 255, 0.84);
  backdrop-filter: blur(14px);
  position: sticky;
  top: 0;
  z-index: 20;
}
.nav {
  max-width: 1120px;
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.logo {
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--text);
  font-size: 22px;
}
.logo span { color: var(--primary); }
.nav-links { display: flex; gap: 18px; align-items: center; font-size: 14px; }
.container { max-width: 1120px; margin: 0 auto; padding: 36px 20px; }
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
  align-items: center;
  gap: 32px;
  padding-top: 26px;
  padding-bottom: 34px;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--primary-dark);
  background: var(--soft);
  border: 1px solid #d8e6ff;
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 14px;
  font-weight: 700;
}
h1 {
  font-size: clamp(38px, 6vw, 68px);
  line-height: 0.95;
  letter-spacing: -0.07em;
  margin: 20px 0 18px;
}
.hero p { font-size: 18px; color: var(--muted); max-width: 690px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--primary);
  border-radius: 14px;
  padding: 12px 18px;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  cursor: pointer;
  transition: transform .15s ease, background .15s ease, box-shadow .15s ease;
  box-shadow: 0 10px 22px rgba(37, 99, 235, .16);
}
.button:hover { background: var(--primary-dark); text-decoration: none; transform: translateY(-1px); }
.button.secondary { background: #fff; color: var(--primary); box-shadow: none; }
.card {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--border);
  border-radius: 26px;
  box-shadow: var(--shadow);
}
.preview-card { padding: 22px; }
.preview-line { height: 12px; border-radius: 999px; background: #e7ebf3; margin: 12px 0; }
.preview-line.wide { width: 92%; }
.preview-line.medium { width: 70%; }
.preview-line.short { width: 44%; }
.preview-output {
  background: #0f172a;
  color: #e5edff;
  border-radius: 18px;
  padding: 18px;
  margin-top: 18px;
  font-size: 14px;
  overflow-wrap: anywhere;
}
.grid { display: grid; gap: 18px; }
.tool-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.tool-card { padding: 22px; }
.tool-card h3 { margin: 0 0 8px; font-size: 20px; letter-spacing: -0.03em; }
.tool-card p { color: var(--muted); margin: 0 0 18px; }
.section { padding: 34px 0; }
.section h2 {
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.08;
  letter-spacing: -0.055em;
  margin: 0 0 14px;
}
.section-intro { color: var(--muted); max-width: 760px; font-size: 17px; }
.generator, .json-tool { padding: 24px; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.form-row { display: flex; flex-direction: column; gap: 8px; }
.form-row.full { grid-column: 1 / -1; }
label { font-weight: 800; font-size: 14px; }
input, select, textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 13px;
  font: inherit;
  color: var(--text);
  background: #fff;
  outline: none;
}
textarea { min-height: 110px; resize: vertical; }
input:focus, select:focus, textarea:focus {
  border-color: #8bb4ff;
  box-shadow: 0 0 0 4px rgba(37, 99, 235, .1);
}
.output-box {
  margin-top: 18px;
  border: 1px solid #d8e6ff;
  background: #f8fbff;
  border-radius: 18px;
  padding: 18px;
}
.output-title { display: flex; justify-content: space-between; gap: 14px; align-items: center; margin-bottom: 10px; }
.output-title h3 { margin: 0; }
.copy-button {
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 12px;
  padding: 8px 12px;
  cursor: pointer;
  font-weight: 800;
}
.copy-button.done { color: var(--success); border-color: #b7ead8; background: #edfff7; }
.prompt-text { white-space: pre-wrap; color: #263149; margin: 0; }
.example-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.example { padding: 20px; }
.example strong { display: block; margin-bottom: 8px; }
.faq { display: grid; gap: 12px; }
details { border: 1px solid var(--border); border-radius: 18px; background: #fff; padding: 16px 18px; }
summary { cursor: pointer; font-weight: 800; }
details p { color: var(--muted); }
.content-page { max-width: 850px; margin: 0 auto; }
.content-page h1 { font-size: clamp(34px, 5vw, 54px); }
.content-page h2 { margin-top: 32px; letter-spacing: -0.035em; }
.content-page p, .content-page li { color: var(--muted); }
.footer { border-top: 1px solid var(--border); padding: 28px 20px; color: var(--muted); font-size: 14px; }
.footer-inner { max-width: 1120px; margin: 0 auto; display: flex; justify-content: space-between; gap: 18px; flex-wrap: wrap; }
.footer-links { display: flex; gap: 14px; flex-wrap: wrap; }
.notice { background: #fff7ed; border: 1px solid #fed7aa; color: #7c2d12; padding: 12px 14px; border-radius: 16px; font-size: 14px; }
.json-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 16px 0; }
.json-output {
  min-height: 170px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 14px;
}
.status-message { margin-top: 10px; font-size: 14px; color: var(--muted); }
.status-message.error { color: #b42318; }
.status-message.success { color: var(--success); }
.code-note {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  background: #f3f6fb;
  border: 1px solid var(--border);
  padding: 2px 6px;
  border-radius: 8px;
  color: #263149;
}
@media (max-width: 840px) {
  .hero { grid-template-columns: 1fr; }
  .tool-grid, .example-list, .form-grid { grid-template-columns: 1fr; }
  .nav { align-items: flex-start; flex-direction: column; }
  .nav-links { flex-wrap: wrap; }
}