:root {
  --bg: #f4f7fb;
  --card: #ffffff;
  --border: #dbe4f0;
  --text: #213043;
  --muted: #64748b;
  --primary: #355cde;
  --primary-soft: #e9efff;
  --accent: #0ea5a4;
  --danger: #dc2626;
  --success: #15803d;
  --shadow: 0 18px 45px rgba(36, 62, 120, 0.10);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, Arial, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #eef4fb 0%, #f7f9fc 100%);
}
.page-shell {
  width: min(1200px, calc(100% - 32px));
  margin: 24px auto 48px;
}
.hero {
  background: linear-gradient(135deg, #ffffff, #f0f6ff);
  border: 1px solid var(--border);
  border-radius: 28px;
  box-shadow: var(--shadow);
  padding: 32px;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 24px;
  margin-bottom: 20px;
}
.eyebrow {
  display: inline-block;
  margin-bottom: 12px;
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
  font-weight: 700;
}
.hero h1 { margin: 0 0 12px; font-size: clamp(2rem, 3vw, 3rem); line-height: 1.15; }
.hero p { margin: 0; color: var(--muted); line-height: 1.7; }
.hero__card {
  display: grid;
  gap: 12px;
  align-content: start;
}
.mini-stat {
  background: var(--primary-soft);
  border-radius: 20px;
  padding: 18px;
  border: 1px solid #d7e2ff;
}
.mini-stat strong { display: block; font-size: 1.3rem; margin-bottom: 6px; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
  padding: 28px;
  margin-bottom: 18px;
}
.card--important { border-left: 8px solid var(--primary); }
.card h2 { margin: 0 0 12px; font-size: 1.45rem; }
.card h3 { margin-top: 0; }
.label {
  display: block;
  margin: 12px 0;
  font-weight: 600;
}
.input {
  width: 100%;
  margin-top: 8px;
  border: 1px solid #cfd8e6;
  border-radius: 14px;
  padding: 12px 14px;
  font: inherit;
  background: #fff;
  color: var(--text);
}
.input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(53, 92, 222, 0.12);
}
.inline-input { display: inline-block; width: 180px; margin-left: 8px; margin-right: 8px; }
.inline-code-input {
  width: 68px;
  border: 1px solid #9bb0e5;
  border-radius: 8px;
  padding: 6px 8px;
  font: inherit;
  background: #fff;
}
.textarea { min-height: 120px; resize: vertical; }
.small-textarea { min-height: 82px; }
.code-area { min-height: 180px; font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }
.small-input { width: 90px; }
.table-input { min-width: 120px; }
.select-like { appearance: auto; }
.help-text { color: var(--muted); margin-top: 10px; }
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.gap-grid { display: grid; gap: 12px; }
.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 24px;
}
.checkbox-grid label, .compact label {
  background: #f8fbff;
  border: 1px solid #d9e5f5;
  border-radius: 16px;
  padding: 12px 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.match-row {
  display: grid;
  grid-template-columns: 1.1fr 1.4fr;
  gap: 12px;
  align-items: center;
  margin-bottom: 14px;
}
.visual-box {
  border: 1px dashed #b7c8e7;
  background: #f8fbff;
  border-radius: 20px;
  padding: 16px;
  min-height: 220px;
}
.svg-illustration { width: 100%; height: auto; stroke: #355cde; fill: rgba(53,92,222,0.08); stroke-width: 2; }
.svg-illustration text { fill: #1f3265; stroke: none; font-size: 16px; font-family: Inter, Arial, sans-serif; text-anchor: middle; }
.data-table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border-radius: 18px;
}
.data-table th, .data-table td {
  border: 1px solid #d9e2ef;
  padding: 12px;
  vertical-align: top;
}
.data-table th { background: #f2f6fd; text-align: left; }
.code-box {
  background: #0f172a;
  color: #f8fafc;
  padding: 18px;
  border-radius: 18px;
  overflow: auto;
  line-height: 1.6;
}
.cards-demo {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 16px;
}
.demo-mini {
  padding: 16px;
  border: 1px dashed #8fb0ff;
  border-radius: 12px;
  background: #f6f9ff;
  text-align: center;
}
.flowchart-box {
  margin-top: 18px;
  display: grid;
  gap: 10px;
  justify-items: center;
  padding: 20px;
  background: #f9fbff;
  border-radius: 20px;
  border: 1px solid #d9e5f5;
}
.flow {
  padding: 14px 18px;
  min-width: 220px;
  text-align: center;
  border: 2px solid #8fb0ff;
  background: white;
}
.flow.start, .flow.end { border-radius: 999px; }
.flow.process { border-radius: 12px; }
.flow.decision { transform: skew(-18deg); }
.flow.decision::before { content: ''; }
.alert {
  padding: 16px 18px;
  border-radius: 18px;
  margin-bottom: 16px;
  font-weight: 700;
}
.alert--success { background: #ecfdf3; color: var(--success); border: 1px solid #b6e8c7; }
.alert--error { background: #fff1f2; color: var(--danger); border: 1px solid #fecdd3; }
.submit-card { text-align: center; }
.submit-btn {
  border: none;
  background: linear-gradient(135deg, var(--primary), #5f88ff);
  color: white;
  font: inherit;
  font-weight: 800;
  border-radius: 16px;
  padding: 16px 24px;
  cursor: pointer;
  box-shadow: 0 12px 30px rgba(53, 92, 222, 0.25);
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.submit-btn:hover { transform: translateY(-1px); }
.submit-btn:disabled { opacity: 0.65; cursor: not-allowed; }
code { background: #edf2ff; padding: 2px 6px; border-radius: 6px; }
@media (max-width: 900px) {
  .hero, .grid-2, .checkbox-grid, .match-row { grid-template-columns: 1fr; }
  .page-shell { width: min(100% - 20px, 1200px); }
  .card, .hero { padding: 22px; }
}