:root {
  color-scheme: light;
  --bg: #f4f6f8;
  --panel: #ffffff;
  --text: #1f2933;
  --muted: #5c6773;
  --primary: #1f7aec;
  --primary-soft: #e8f1fe;
  --danger: #d64545;
  --border: #d8e1ea;
  --shadow: 0 10px 30px rgba(22, 50, 79, 0.08);
}

* { box-sizing: border-box; }

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  background:
    radial-gradient(circle at top, rgba(31, 122, 236, 0.08), transparent 35%),
    var(--bg);
  color: var(--text);
}

.site-header {
  padding: 2rem 1rem 1.5rem;
  background: linear-gradient(135deg, #16324f, #1f4f80);
  color: #fff;
}

.header-inner,
main {
  max-width: 1120px;
  margin: 0 auto;
}

.eyebrow {
  margin: 0 0 0.5rem;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.85;
}

.site-header h1 {
  margin: 0;
  font-size: clamp(1.9rem, 4vw, 2.8rem);
}

.lead {
  margin: 0.8rem 0 0;
  max-width: 760px;
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.7;
}

.header-badges {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.22);
  font-size: 0.88rem;
}

main {
  padding: 1.25rem 1rem 2rem;
  display: grid;
  gap: 1rem;
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 1rem;
}

.bottom-grid {
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1rem;
  box-shadow: var(--shadow);
}

.intro-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.8fr);
  gap: 1rem;
  align-items: center;
}

.intro-panel h2,
.panel h2 {
  margin: 0;
}

.intro-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
}

.intro-metrics article {
  padding: 0.9rem;
  border-radius: 14px;
  background: var(--primary-soft);
  display: grid;
  gap: 0.25rem;
  text-align: center;
}

.intro-metrics strong {
  font-size: 1.15rem;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
}

button,
select,
input,
textarea {
  font: inherit;
}

.action-row {
  margin-top: 0.8rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.action-row-primary button {
  min-height: 46px;
}

button,
.file-upload,
select,
input,
textarea {
  border: 1px solid var(--border);
  border-radius: 10px;
}

button,
.file-upload {
  background: #fff;
  padding: 0.6rem 0.9rem;
  cursor: pointer;
  transition: border-color 0.2s ease, transform 0.2s ease, background 0.2s ease;
}

button:hover,
.file-upload:hover,
button:focus-visible,
.file-upload:focus-within {
  border-color: var(--primary);
}

button:active {
  transform: translateY(1px);
}

button.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

button.danger {
  color: #fff;
  background: var(--danger);
  border-color: var(--danger);
}

button.small { padding: 0.4rem 0.65rem; }

.db-toggle {
  display: inline-grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
  width: min(100%, 280px);
}

.db-toggle button {
  min-height: 48px;
}

.file-upload input { display: none; }

.node {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0.75rem;
  margin-top: 0.75rem;
  background: #fcfdff;
}

.group-node { border-left: 4px solid #78a8e8; }
.condition-node { border-left: 4px solid #8ac37b; }

.node-header {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  align-items: center;
}

.node-actions {
  display: flex;
  gap: 0.4rem;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.children {
  margin-left: 1rem;
  border-left: 1px dashed var(--border);
  padding-left: 0.8rem;
}

.condition-grid {
  margin-top: 0.75rem;
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.92rem;
}

select,
input,
textarea {
  width: 100%;
  padding: 0.7rem 0.8rem;
  background: #fdfefe;
}

.checkbox-label {
  flex-direction: row;
  align-items: center;
  margin-top: 1.55rem;
}

.checkbox-label input {
  width: auto;
  margin: 0;
}

textarea {
  resize: vertical;
  min-height: 9rem;
}

.hint {
  color: var(--muted);
  margin: 0.35rem 0 0;
  line-height: 1.6;
}

.guide-list {
  margin: 0.75rem 0 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.5rem;
  line-height: 1.7;
}

#copy-status {
  color: #1f7a1f;
  min-height: 1.5rem;
}

@media (max-width: 900px) {
  .content-grid,
  .bottom-grid,
  .intro-panel {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .site-header {
    padding: 1.4rem 1rem 1.2rem;
  }

  main {
    padding: 1rem 0.75rem 1.5rem;
  }

  .panel {
    padding: 0.9rem;
    border-radius: 14px;
  }

  .section-heading,
  .node-header,
  .node-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .action-row,
  .action-row-primary,
  .db-toggle,
  .node-actions {
    width: 100%;
  }

  .action-row button,
  .action-row .file-upload,
  .node-actions button,
  .node-actions label,
  .db-toggle button {
    width: 100%;
  }

  .intro-metrics {
    grid-template-columns: 1fr;
  }

  .children {
    margin-left: 0.4rem;
    padding-left: 0.6rem;
  }

  .condition-grid {
    grid-template-columns: 1fr;
  }

  .checkbox-label {
    margin-top: 0;
  }

  textarea {
    min-height: 11rem;
  }
}