:root {
  --bg: #f8f6fc;
  --card: #ffffff;
  --lavender: #a993d6;
  --lavender-deep: #7e66b8;
  --lavender-soft: #ece6f8;
  --lavender-pale: #f5f1fc;
  --text: #3d3550;
  --muted: #847b96;
  --line: #e4ddf2;
  --danger: #c4607a;
  --radius: 16px;
  --shadow: 0 4px 18px rgba(126, 102, 184, 0.10);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  font-size: 17px;
  line-height: 1.6;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
  -webkit-tap-highlight-color: transparent;
}

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

/* ---------- ヘッダー・タブ ---------- */
.app-header {
  text-align: center;
  padding: 28px 16px 8px;
}
.brand {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.25em;
  color: var(--lavender-deep);
}
.app-header h1 {
  margin: 4px 0 0;
  font-size: 24px;
  font-weight: 600;
}

.tabs {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  gap: 6px;
  max-width: 560px;
  margin: 12px auto 0;
  padding: 6px;
  background: var(--lavender-soft);
  border-radius: 999px;
}
.tab {
  flex: 1;
  min-height: 46px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-weight: 600;
  cursor: pointer;
}
.tab.is-active {
  background: var(--card);
  color: var(--lavender-deep);
  box-shadow: var(--shadow);
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px 16px 60px;
}
.panel[hidden] { display: none; }

/* ---------- レイアウト ---------- */
.layout {
  display: grid;
  gap: 20px;
}
@media (min-width: 900px) {
  .layout { grid-template-columns: 1fr 1fr; align-items: start; }
  .result { position: sticky; top: 76px; }
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
  margin-bottom: 20px;
}
.layout .card { margin-bottom: 0; }
.card-title { margin: 0 0 6px; font-size: 18px; }

/* ---------- フォーム ---------- */
.field { margin-bottom: 22px; }
.label {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 8px;
  font-weight: 600;
}
.step {
  display: inline-grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--lavender);
  color: #fff;
  font-size: 14px;
}
.req {
  font-size: 12px;
  color: #fff;
  background: var(--danger);
  border-radius: 6px;
  padding: 0 6px;
}

input[type="text"], input[type="search"], textarea {
  width: 100%;
  border: 1.5px solid var(--line);
  border-radius: 12px;
  background: var(--lavender-pale);
  padding: 12px 14px;
  font-size: 17px; /* 16px以上でiPadのズームを防ぐ */
  outline: none;
  -webkit-appearance: none;
  appearance: none;
}
input:focus, textarea:focus {
  border-color: var(--lavender);
  background: #fff;
}
textarea { resize: vertical; line-height: 1.7; }
input.is-error { border-color: var(--danger); }

.choices {
  display: flex;
  gap: 8px;
}
.choices.wrap { flex-wrap: wrap; }
.choice {
  flex: 1;
  min-height: 48px;
  padding: 8px 14px;
  border: 1.5px solid var(--line);
  border-radius: 12px;
  background: #fff;
  cursor: pointer;
  white-space: nowrap;
}
.choices.wrap .choice { flex: 1 1 auto; }
.choice.is-active {
  border-color: var(--lavender);
  background: var(--lavender-soft);
  color: var(--lavender-deep);
  font-weight: 600;
}
.choices.small .choice { min-height: 40px; font-size: 15px; }

.more {
  margin-bottom: 22px;
  border: 1.5px dashed var(--line);
  border-radius: 12px;
  padding: 4px 14px;
}
.more summary {
  cursor: pointer;
  padding: 10px 0;
  color: var(--lavender-deep);
  font-weight: 600;
}
.more[open] summary { margin-bottom: 8px; }

/* ---------- ボタン ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 10px 16px;
  border: 1.5px solid var(--line);
  border-radius: 12px;
  background: #fff;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
}
.btn:active { transform: scale(0.98); }
.btn-primary {
  border-color: var(--lavender-deep);
  background: var(--lavender-deep);
  color: #fff;
}
.btn-accent {
  border-color: var(--lavender);
  background: var(--lavender-soft);
  color: var(--lavender-deep);
}
.btn-danger {
  border-color: #f0d3dc;
  color: var(--danger);
}
.btn-block { display: flex; width: 100%; margin-top: 10px; }
.btn-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 10px;
}

/* ---------- 結果 ---------- */
.result-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.result-head h2 { margin: 0; font-size: 20px; }
.badge {
  font-size: 13px;
  font-weight: 600;
  color: var(--lavender-deep);
  background: var(--lavender-soft);
  border-radius: 999px;
  padding: 4px 12px;
}
.hint { margin: 4px 0 14px; font-size: 14px; color: var(--muted); }
.result textarea { margin-bottom: 14px; }
.counter { margin: -6px 0 6px; font-size: 14px; color: var(--muted); text-align: right; }
.counter.is-over { color: var(--danger); font-weight: 600; }

/* ---------- 履歴 ---------- */
.history-tools {
  display: grid;
  gap: 10px;
  margin-bottom: 16px;
}
@media (min-width: 700px) {
  .history-tools { grid-template-columns: 1fr auto; }
}
.history-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.history-item {
  border: 1.5px solid var(--line);
  border-radius: 14px;
  padding: 16px;
}
.history-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--muted);
}
.history-theme { margin: 6px 0; font-size: 18px; font-weight: 600; }
.history-preview {
  margin: 0 0 12px;
  font-size: 15px;
  color: var(--muted);
  white-space: pre-wrap;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.history-actions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.history-actions .btn { min-height: 44px; font-size: 15px; padding: 6px 8px; }
.empty { text-align: center; color: var(--muted); margin: 24px 0; }

/* ---------- トースト ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: calc(28px + env(safe-area-inset-bottom));
  transform: translate(-50%, 20px);
  background: var(--text);
  color: #fff;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s, transform .2s;
  z-index: 100;
}
.toast.is-show { opacity: 1; transform: translate(-50%, 0); }