/* ============================================================
   カレンダーから期間計算するサカくん — style.css
   ============================================================ */

/* ── リセット ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ── デザイントークン ── */
:root {
  /* カラー */
  --bg:           #FDF4EA;
  --surface:      #FFFFFF;
  --surface2:     #F5EAD8;
  --border:       rgba(73,167,206,0.15);
  --border2:      rgba(73,167,206,0.30);
  --text:         #2C2C2C;
  --muted:        #7A7A7A;
  --accent:       #49A7CE;
  --accent-dark:  #3388AD;
  --accent-light: rgba(73,167,206,0.10);
  --accent-glow:  rgba(73,167,206,0.20);
  --success:      #2DA870;
  --warning:      #D48A10;
  --danger:       #D64545;
  --success-bg:   rgba(45,168,112,0.09);
  --warning-bg:   rgba(212,138,16,0.09);
  --danger-bg:    rgba(214,69,69,0.09);

  /* 角丸 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
}

/* ── ベース ── */
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 400;
  min-height: 100vh;
  line-height: 1.7;
}

/* ============================================================
   ヘッダー
   ============================================================ */
header {
  background: var(--surface);
  border-bottom: 1px solid var(--border2);
  padding: 0 2rem;
}

.header-inner {
  max-width: 860px;
  margin: 0 auto;
  padding: 1.2rem 0;
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo-link {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none;
}

.logo-img {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  display: block;
}

.logo-text {
  font-family: 'Outfit', sans-serif;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.logo-text small {
  display: block;
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--muted);
  font-family: 'Noto Sans JP', sans-serif;
  letter-spacing: 0;
}

.header-free-badge {
  background: var(--accent);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  padding: 0.28rem 0.75rem;
  border-radius: 999px;
  white-space: nowrap;
  font-family: 'Noto Sans JP', sans-serif;
}

.header-usage-count {
  margin-left: auto;
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--muted);
  font-family: 'Noto Sans JP', sans-serif;
  white-space: nowrap;
}

.header-usage-count strong {
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  color: var(--accent-dark);
}

/* ============================================================
   ヒーロー
   ============================================================ */
.hero {
  background: linear-gradient(135deg, #FDF4EA 0%, #FEF1DA 50%, #FDF4EA 100%);
  border-bottom: 2px solid rgba(73,167,206,0.15);
  padding: 2.8rem 2rem 0;
  overflow: hidden;
}

.hero-inner {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  align-items: flex-end;
  gap: 1rem;
}

.hero-text {
  flex: 1;
  padding-bottom: 2.5rem;
}

.hero h1 {
  font-family: 'Outfit', sans-serif;
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  font-weight: 700;
  color: var(--text);
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: 0.9rem;
}

.hero h1 em {
  font-style: normal;
  color: var(--accent);
}

.hero-lead {
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.8;
  max-width: 480px;
  margin-bottom: 1.4rem;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.hero-badge {
  display: flex;
  align-items: center;
  gap: 5px;
  background: #fff;
  border: 1px solid var(--border2);
  border-radius: 999px;
  padding: 0.35rem 0.85rem;
  font-size: 0.8rem;
  color: var(--text);
  font-weight: 500;
}

.badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #AAAAAA;
  flex-shrink: 0;
  display: inline-block;
}

.hero-chara {
  flex-shrink: 0;
  width: 300px;
  height: 300px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  overflow: hidden;
}

.hero-chara img {
  width: 300px;
  height: 300px;
  object-fit: contain;
  object-position: bottom;
  display: block;
}

/* ============================================================
   計算ツール本体
   ============================================================ */
.tool-section {
  max-width: 860px;
  margin: 0 auto;
  padding: 2.5rem 2rem;
}

.tool-heading {
  font-family: 'Outfit', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.tool-heading::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 1.1em;
  background: var(--accent);
  border-radius: 2px;
  flex-shrink: 0;
}

/* 入力カード */
.input-card {
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: var(--radius-lg);
  padding: 2rem 2.25rem;
  box-shadow: 0 2px 16px rgba(73,167,206,0.07);
  margin-bottom: 1.5rem;
}

.input-card .sub {
  color: var(--muted);
  font-size: 0.875rem;
  margin-bottom: 1.75rem;
}

.field-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.45rem;
}

/* 開始日・終了日 2カラム */
.date-settings {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.75rem;
  margin-bottom: 1.75rem;
}

.date-group-heading {
  font-family: 'Outfit', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.7rem;
  display: flex;
  align-items: center;
  gap: 6px;
}

.date-input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border2);
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.9rem;
  color: var(--text);
  font-family: 'Outfit', sans-serif;
  font-size: 0.98rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  margin-bottom: 0.7rem;
}

.date-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.quick-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.quick-btn {
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--border2);
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--accent-dark);
  background: var(--accent-light);
  cursor: pointer;
  transition: all 0.15s;
  font-family: 'Noto Sans JP', sans-serif;
}

.quick-btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* 初日を含む/含まない トグル */
.inclusive-row {
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
}

.toggle-pills {
  display: flex;
  gap: 0.5rem;
}

.toggle-pill {
  flex: 1;
  text-align: center;
  padding: 0.6rem 1rem;
  border: 1px solid var(--border2);
  border-radius: var(--radius-sm);
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  transition: all 0.15s;
  font-family: 'Noto Sans JP', sans-serif;
}

.toggle-pill.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* エラーメッセージ */
.date-error {
  display: none;
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  background: var(--danger-bg);
  color: var(--danger);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
}

.date-error.show { display: block; }

/* ============================================================
   結果表示エリア
   ============================================================ */
.result-card {
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: var(--radius-lg);
  padding: 2.25rem 2rem;
  box-shadow: 0 2px 16px rgba(73,167,206,0.07);
  text-align: center;
}

.result-range {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 1rem;
}

.result-range strong {
  color: var(--text);
  font-weight: 500;
}

.result-days-num {
  font-family: 'Outfit', sans-serif;
  font-size: clamp(3rem, 10vw, 4.6rem);
  font-weight: 700;
  color: var(--accent-dark);
  line-height: 1;
  letter-spacing: -0.02em;
}

.result-days-label {
  font-size: 0.95rem;
  color: var(--muted);
  margin-top: 0.4rem;
  margin-bottom: 1.75rem;
}

/* 換算テーブル */
.conversion-table-wrap {
  overflow-x: auto;
}

.conversion-table {
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.conversion-table th,
.conversion-table td {
  padding: 0.7rem 1.1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.conversion-table th {
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--muted);
  background: var(--surface2);
  text-transform: uppercase;
}

.conversion-table td:nth-child(2) {
  text-align: right;
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  color: var(--text);
}

.conversion-table th:nth-child(2) {
  text-align: right;
}

.conversion-note {
  margin-top: 1.25rem;
  font-size: 0.75rem;
  color: var(--muted);
  line-height: 1.7;
  text-align: left;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================================
   コンテンツセクション（できること・使用例）
   ============================================================ */
.content-section {
  max-width: 860px;
  margin: 0 auto;
  padding: 3rem 2rem;
  border-top: 1px solid var(--border);
}

.section-heading {
  font-family: 'Outfit', sans-serif;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-heading::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 1.2em;
  background: var(--accent);
  border-radius: 2px;
  flex-shrink: 0;
}

.section-lead {
  color: var(--muted);
  font-size: 0.875rem;
  margin-bottom: 1.75rem;
}

/* できることグリッド */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.35rem;
  transition: box-shadow 0.15s;
}

.feature-card:hover {
  box-shadow: 0 4px 16px rgba(73,167,206,0.10);
}

.feature-icon {
  font-size: 1.5rem;
  margin-bottom: 0.6rem;
}

.feature-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.4rem;
}

.feature-desc {
  font-size: 0.83rem;
  color: var(--muted);
  line-height: 1.65;
}

/* 使用例リスト */
.usecase-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.usecase-item {
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.35rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.usecase-num {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.78rem;
  font-weight: 700;
  font-family: 'Outfit', sans-serif;
  margin-top: 1px;
}

.usecase-body strong {
  display: block;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.3rem;
}

.usecase-body p {
  font-size: 0.84rem;
  color: var(--muted);
  line-height: 1.65;
  margin: 0;
}

/* ============================================================
   開発コストテーブル
   ============================================================ */
.cost-table-wrap {
  overflow-x: auto;
}

.cost-table {
  width: 100%;
  max-width: 480px;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.cost-table th,
.cost-table td {
  padding: 0.7rem 1.1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.cost-table th {
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--muted);
  background: var(--surface2);
  text-transform: uppercase;
}

.cost-table td:nth-child(2),
.cost-table td:nth-child(3) {
  text-align: right;
}

.cost-table th:nth-child(2),
.cost-table th:nth-child(3) {
  text-align: right;
}

.cost-table-total td {
  font-weight: 600;
  color: var(--text);
  background: var(--accent-light);
  border-top: 2px solid var(--border2);
  border-bottom: none;
}

/* ============================================================
   フッター
   ============================================================ */
footer {
  text-align: center;
  font-size: 0.8rem;
  color: var(--muted);
  padding: 2rem;
  border-top: 1px solid var(--border2);
}

/* ============================================================
   レスポンシブ
   ============================================================ */
@media (max-width: 600px) {
  .hero h1 { font-size: 1.4rem; }
  .hero-chara { display: none; }
  .features-grid { grid-template-columns: 1fr; }
  .header-usage-count { display: none; }
  .date-settings { grid-template-columns: 1fr; gap: 1.5rem; }
  .input-card { padding: 1.5rem 1.5rem; }
}