:root {
  --color-bg: #f7f8fa;
  --color-surface: #ffffff;
  --color-text: #1f2430;
  --color-muted: #6b7280;
  --color-primary: #2f5d50;
  --color-primary-contrast: #ffffff;
  --color-border: #dfe3e8;
  --color-warning-bg: #fff3cd;
  --color-warning-text: #7a5b00;
  --radius: 8px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #14161a;
    --color-surface: #1d2026;
    --color-text: #e8eaee;
    --color-muted: #9aa1ac;
    --color-primary: #6fbfa8;
    --color-primary-contrast: #0b1210;
    --color-border: #33373f;
    --color-warning-bg: #4a3c00;
    --color-warning-text: #ffe08a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", "Hiragino Sans", "Yu Gothic", sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

.app-header {
  padding: 24px 16px 8px;
  text-align: center;
}
.app-header h1 { margin: 0 0 4px; font-size: 1.6rem; }
.subtitle { margin: 0; color: var(--color-muted); font-size: 0.9rem; }

.banner {
  margin: 8px 16px;
  padding: 10px 14px;
  border-radius: var(--radius);
  font-size: 0.9rem;
}
.banner-warning {
  background: var(--color-warning-bg);
  color: var(--color-warning-text);
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 8px 16px;
  border-bottom: 1px solid var(--color-border);
}
.tab-btn {
  border: none;
  background: transparent;
  color: var(--color-muted);
  padding: 8px 14px;
  border-radius: var(--radius) var(--radius) 0 0;
  cursor: pointer;
  font-size: 0.95rem;
}
.tab-btn.is-active {
  background: var(--color-surface);
  color: var(--color-primary);
  font-weight: bold;
  border: 1px solid var(--color-border);
  border-bottom: none;
}

main { max-width: 760px; margin: 0 auto; padding: 16px; }

.tab-panel { display: none; }
.tab-panel.is-active { display: block; }

.tab-panel h2 { margin-top: 0; }

.empty-hint { color: var(--color-muted); font-style: italic; }

.company-type-switch {
  display: flex;
  gap: 16px;
  margin-bottom: 12px;
  padding: 8px 12px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.result-box {
  margin-top: 16px;
  padding: 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.flow-steps { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.flow-steps li {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius);
  padding: 12px 14px;
}
.flow-steps li.is-selected { outline: 2px solid var(--color-primary); }
.flow-steps .step-title { font-weight: bold; cursor: pointer; }
.flow-steps .step-desc { color: var(--color-muted); font-size: 0.9rem; margin-top: 4px; }

.checklist-step {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 12px 14px;
  margin-bottom: 10px;
}
.checklist-step h3 { margin: 0 0 8px; font-size: 1rem; }
.checklist-step label { display: block; padding: 4px 0; }

form label { display: block; margin-bottom: 10px; font-size: 0.9rem; }
form input[type="text"], form input[type="number"], form textarea {
  width: 100%;
  padding: 8px;
  margin-top: 4px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: inherit;
}
form textarea { min-height: 60px; resize: vertical; }

fieldset { border: 1px solid var(--color-border); border-radius: var(--radius); margin-bottom: 12px; }

button {
  background: var(--color-primary);
  color: var(--color-primary-contrast);
  border: none;
  padding: 10px 16px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.95rem;
  margin: 4px 8px 4px 0;
}
button:disabled { opacity: 0.5; cursor: not-allowed; }

input.field-error { outline: 2px solid #d64545; }

.doc-list, .doc-list ul { padding-left: 18px; }
.doc-list li { margin-bottom: 8px; }

.generated-doc {
  margin-top: 16px;
  padding: 12px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}
.generated-doc pre {
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 0.85rem;
  max-height: 300px;
  overflow-y: auto;
}

.app-footer {
  margin-top: 24px;
  padding: 16px;
  text-align: center;
  font-size: 0.78rem;
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
}

@media (max-width: 480px) {
  .tabs { overflow-x: auto; flex-wrap: nowrap; }
}