/* ===========================
   リセット・基本設定
=========================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --green-dark:   #2D6A4F;
  --green-mid:    #40916C;
  --green-light:  #74C69D;
  --green-pale:   #D8F3DC;
  --bg:           #F5F5F5;
  --card-bg:      #FFFFFF;
  --text:         #1B1B1B;
  --text-muted:   #6B6B6B;
  --border:       #E0E0E0;
  --red:          #D62828;
  --red-pale:     #FFE8E8;
  --radius:       12px;
  --shadow:       0 2px 12px rgba(0,0,0,.08);
}

html { font-size: 16px; }

body {
  font-family: system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ===========================
   レイアウト
=========================== */
.header {
  background: var(--green-dark);
  color: #fff;
  text-align: center;
  padding: 28px 20px 24px;
}

.header-icon {
  font-size: 40px;
  line-height: 1;
  margin-bottom: 8px;
}

.header-title {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: .03em;
}

.header-subtitle {
  font-size: 13px;
  opacity: .85;
  margin-top: 4px;
}

.main {
  max-width: 480px;
  margin: 0 auto;
  padding: 20px 16px 40px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ===========================
   カード
=========================== */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px 20px;
}

/* ===========================
   フォーム
=========================== */
.section-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--green-dark);
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--green-pale);
}

.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.optional {
  font-size: 11px;
  font-weight: 400;
  color: var(--text-muted);
  background: #f0f0f0;
  padding: 1px 6px;
  border-radius: 4px;
  margin-left: 4px;
}

.input-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.form-input {
  flex: 1;
  padding: 14px 12px;
  font-size: 16px;
  font-family: inherit;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  outline: none;
  background: #fafafa;
  transition: border-color .2s, background .2s;
  -webkit-appearance: none;
}

.form-input:focus {
  border-color: var(--green-mid);
  background: #fff;
}

.form-input::placeholder {
  color: #bbb;
}

/* スピナー非表示 */
.form-input[type=number]::-webkit-inner-spin-button,
.form-input[type=number]::-webkit-outer-spin-button {
  -webkit-appearance: none;
}
.form-input[type=number] { -moz-appearance: textfield; }

.input-unit {
  font-size: 13px;
  color: var(--text-muted);
  white-space: nowrap;
  min-width: 52px;
}

.form-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

.divider {
  height: 1px;
  background: var(--border);
  margin: 24px 0 16px;
}

.section-note {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 18px;
}

/* ===========================
   計算ボタン
=========================== */
.btn-calc {
  width: 100%;
  padding: 16px;
  background: var(--green-dark);
  color: #fff;
  font-size: 17px;
  font-weight: 700;
  font-family: inherit;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  margin-top: 8px;
  transition: background .2s, transform .1s;
  -webkit-tap-highlight-color: transparent;
}

.btn-calc:active {
  background: var(--green-mid);
  transform: scale(.98);
}

/* ===========================
   結果エリア
=========================== */
.result-card[hidden] { display: none; }

.result-main {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

.result-item {
  background: var(--bg);
  border-radius: 10px;
  padding: 14px 16px;
  position: relative;
}

.result-label {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.result-value {
  font-size: 32px;
  font-weight: 800;
  color: var(--green-dark);
  letter-spacing: -.01em;
  line-height: 1.1;
}

.result-value--md {
  font-size: 24px;
}

.result-unit {
  font-size: 13px;
  color: var(--text-muted);
  margin-left: 4px;
}

.result-total {
  background: var(--green-pale);
  border: 2px solid var(--green-light);
}

/* 損益セクション */
.result-profit {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  margin-bottom: 24px;
}

.result-profit[hidden] { display: none; }

.result-subtitle {
  font-size: 15px;
  font-weight: 700;
  color: var(--green-dark);
  margin-bottom: 14px;
}

.profit-badge {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 20px;
  margin-left: 8px;
  vertical-align: middle;
}

.profit-badge.positive {
  background: var(--green-pale);
  color: var(--green-dark);
}

.profit-badge.negative {
  background: var(--red-pale);
  color: var(--red);
}

.result-value.negative { color: var(--red); }

.result-hint {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===========================
   円グラフ
=========================== */
.chart-section {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  margin-bottom: 24px;
  text-align: center;
}

#pieChart {
  display: block;
  margin: 0 auto 16px;
  max-width: 100%;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 14px;
  text-align: left;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text);
}

.legend-dot {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  flex-shrink: 0;
}

/* ===========================
   リセットボタン
=========================== */
.btn-reset {
  width: 100%;
  padding: 14px;
  background: transparent;
  color: var(--green-dark);
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  border: 2px solid var(--green-dark);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background .2s, color .2s;
  -webkit-tap-highlight-color: transparent;
}

.btn-reset:active {
  background: var(--green-dark);
  color: #fff;
}

/* ===========================
   フッター
=========================== */
.footer {
  text-align: center;
  padding: 20px 16px 32px;
}

.affiliate-area {
  margin-bottom: 12px;
}

.footer-copy {
  font-size: 12px;
  color: var(--text-muted);
}

/* ===========================
   アニメーション
=========================== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.result-card:not([hidden]) {
  animation: fadeInUp .3s ease both;
}

/* ===========================
   デスクトップ対応
=========================== */
@media (min-width: 520px) {
  .main {
    padding: 28px 20px 48px;
  }
  .card {
    padding: 28px 28px;
  }
}