*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --color-primary: #2c5f8a;
  --color-primary-dark: #1e4463;
  --color-primary-tint: #eaf2f8;
  --color-error: #b3261e;
  --color-error-tint: #fdecea;
  --color-text: #262b30;
  --color-text-muted: #6b7280;
  --color-border: #d8dee4;
  --color-bg: #f2f4f6;
  --color-surface: #ffffff;
  --font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
}

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

body {
  margin: 0;
  font-family: var(--font-family);
  color: var(--color-text);
  background: var(--color-surface);
  line-height: 1.7;
  font-size: 16px;
}

/* モバイルでは画面全体がカードになるよう余白を持たせない */
.page-container {
  padding: 0;
}

.survey-card {
  background: var(--color-surface);
  padding: 24px 16px 48px;
}

.survey-header {
  margin-bottom: 32px;
}

.survey-header__label {
  margin: 0 0 8px;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.03em;
}

.survey-header__title {
  margin: 0 0 12px;
  font-size: 1.375rem;
  font-weight: 700;
  line-height: 1.5;
}

.survey-header__description {
  margin: 0 0 16px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.8;
}

.survey-header__time-note {
  margin: 0 0 16px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.survey-header__required-note {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* 画面上部の通知。hidden属性で表示・非表示を切り替えるためdisplayは指定しない */
.system-message {
  margin: 0 0 24px;
  padding: 16px 18px;
  border: 1px solid var(--color-error);
  border-radius: 10px;
  background: var(--color-error-tint);
  color: var(--color-error);
  font-weight: 700;
  font-size: 0.9rem;
  line-height: 1.6;
  scroll-margin-top: 16px;
}

/* 送信中に表示するメッセージ。hidden属性で表示・非表示を切り替えるためdisplayは指定しない */
.sending-message {
  margin: 0 0 24px;
  padding: 24px 18px;
  border: 1px solid var(--color-primary);
  border-radius: 10px;
  background: var(--color-primary-tint);
  color: var(--color-primary-dark);
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1.7;
  text-align: center;
  scroll-margin-top: 16px;
}

fieldset {
  border: none;
  margin: 0 0 36px;
  padding: 0;
  min-width: 0;
  scroll-margin-top: 16px;
}

fieldset:last-of-type {
  margin-bottom: 0;
}

/* customer_idが取得できない場合にJSから無効化される。見た目でも分かるようにする */
fieldset:disabled {
  opacity: 0.5;
}

.question-title {
  display: block;
  width: 100%;
  margin: 0 0 16px;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.6;
}

.question-number {
  display: inline-block;
  margin-right: 8px;
  color: var(--color-primary);
}

.required-mark,
.optional-mark {
  display: inline-block;
  margin-left: 8px;
  padding: 2px 9px;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  vertical-align: middle;
  white-space: nowrap;
}

.required-mark {
  background: var(--color-error);
  color: #fff;
}

.optional-mark {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

.question-note {
  margin: -8px 0 16px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* Q4の「複数選択できます。」のみ、文言は変えず少し強調する */
.question-note--emphasis {
  color: var(--color-text);
  font-weight: 600;
}

.choice-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* タップしやすいよう十分な高さと余白を確保し、ラベル全体を押せるようにする */
.choice-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  min-height: 48px;
  padding: 14px 16px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-surface);
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.choice-item:hover {
  border-color: var(--color-primary);
}

.choice-item:has(input:checked) {
  border-color: var(--color-primary);
  background: var(--color-primary-tint);
}

.choice-item:has(input:focus-visible) {
  outline: 3px solid rgba(44, 95, 138, 0.35);
  outline-offset: 2px;
}

.choice-item input[type="radio"],
.choice-item input[type="checkbox"] {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  margin: 1px 0 0;
  accent-color: var(--color-primary);
}

.choice-item span {
  flex: 1;
  font-size: 0.95rem;
  line-height: 1.6;
}

.choice-item:has(input:checked) span {
  font-weight: 700;
}

/* 条件付き入力欄。関連する設問に紐づくことが視覚的に分かるようアクセントの縦線を付ける */
.conditional-field {
  margin-top: 12px;
  padding: 16px;
  border-left: 4px solid var(--color-primary);
  border-radius: 0 8px 8px 0;
  background: var(--color-primary-tint);
  scroll-margin-top: 16px;
}

.conditional-field label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

input[type="text"],
textarea {
  width: 100%;
  padding: 12px 14px;
  min-height: 48px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  color: var(--color-text);
  font-family: inherit;
  font-size: 1rem;
  line-height: 1.6;
  scroll-margin-top: 16px;
}

textarea {
  min-height: 96px;
  resize: vertical;
}

input[type="text"]:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(44, 95, 138, 0.15);
}

.character-count {
  margin: 8px 0 0;
  text-align: right;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.character-count span {
  font-weight: 700;
  color: var(--color-text);
}

/* app.jsが設問ごとに追加するエラー表示 */
.field-error {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 12px 0 0;
  padding: 10px 12px;
  border: 1px solid var(--color-error);
  border-radius: 8px;
  background: var(--color-error-tint);
  color: var(--color-error);
  font-size: 0.85rem;
  font-weight: 700;
  line-height: 1.5;
}

.field-error::before {
  content: "!";
  display: flex;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-error);
  color: #fff;
  font-size: 0.75rem;
}

/* app.jsがエラーのある設問全体に付与するクラス */
fieldset.field-invalid .question-title {
  color: var(--color-error);
}

fieldset.field-invalid .choice-item {
  border-color: var(--color-error);
}

.privacy-note {
  margin: 8px 0 32px;
  padding: 16px;
  border-radius: 8px;
  background: var(--color-bg);
  color: #4b5563;
  font-size: 0.9rem;
  line-height: 1.8;
}

.submit-area {
  text-align: center;
}

/* 画面幅いっぱいに近い、タップしやすい送信ボタン */
.submit-button {
  width: 100%;
  padding: 16px 20px;
  border: none;
  border-radius: 10px;
  background: var(--color-primary);
  color: #fff;
  font-size: 1.05rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.05s ease;
}

.submit-button:hover:not(:disabled) {
  background: var(--color-primary-dark);
}

.submit-button:active:not(:disabled) {
  transform: scale(0.98);
}

.submit-button:focus-visible {
  outline: 3px solid rgba(44, 95, 138, 0.4);
  outline-offset: 2px;
}

.submit-button:disabled {
  background: var(--color-border);
  color: var(--color-text-muted);
  cursor: not-allowed;
}

.submit-status {
  min-height: 1.4em;
  margin: 12px 0 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.completion-view {
  padding: 64px 20px;
  text-align: center;
  scroll-margin-top: 16px;
}

.completion-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  margin: 0 auto 24px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-size: 2.25rem;
  font-weight: 700;
}

.completion-view h2 {
  margin: 0 0 12px;
  font-size: 1.25rem;
}

.completion-view p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.8;
}

p.completion-view__note {
  margin-top: 20px;
  font-size: 0.85rem;
}

/* タブレット・PC：中央寄せのカードレイアウトに切り替える */
@media (min-width: 600px) {
  body {
    background: var(--color-bg);
  }

  .page-container {
    display: flex;
    justify-content: center;
    padding: 40px 16px;
  }

  .survey-card {
    width: 100%;
    max-width: 640px;
    padding: 48px 56px 56px;
    border-radius: 16px;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
  }

  /* 完了画面のみの表示時は、独立した画面に見えるよう縦方向も中央寄せにする */
  .page-container:has(#completion-view:not([hidden])) {
    min-height: 100vh;
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-container {
    padding: 64px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    scroll-behavior: auto !important;
  }
}