/* ============================
   瑞葉 販売ページ
   Material Design 3
   Mobile-First
   ============================ */

/* ---------- M3 Design Tokens ---------- */
:root {
  /* Primary: 信頼のブルー */
  --md-primary: #0b5d91;
  --md-on-primary: #ffffff;
  --md-primary-container: #d7edf8;
  --md-on-primary-container: #07334f;

  /* Secondary: ニュートラルグレー */
  --md-secondary: #5f6368;
  --md-on-secondary: #ffffff;
  --md-secondary-container: #e8eaed;
  --md-on-secondary-container: #202124;

  /* Tertiary: アンバー（注意事項） */
  --md-tertiary: #b06000;
  --md-on-tertiary: #ffffff;
  --md-tertiary-container: #fff3e0;
  --md-on-tertiary-container: #3e2100;

  /* Error: 警告の赤 */
  --md-error: #d93025;
  --md-on-error: #ffffff;
  --md-error-container: #fce8e6;
  --md-on-error-container: #5f0000;

  /* Surface: クリーンな白/グレー */
  --md-surface: #ffffff;
  --md-surface-dim: #e3e3e3;
  --md-surface-bright: #ffffff;
  --md-surface-container-lowest: #ffffff;
  --md-surface-container-low: #f8f9fa;
  --md-surface-container: #f1f3f4;
  --md-surface-container-high: #e8eaed;
  --md-surface-container-highest: #dadce0;
  --md-on-surface: #202124;
  --md-on-surface-variant: #5f6368;
  --md-outline: #80868b;
  --md-outline-variant: #dadce0;

  /* Success: 安心のグリーン */
  --md-success: #1e8e3e;
  --md-success-container: #e6f4ea;
  --md-on-success-container: #0d652d;

  /* Checkout-specific accents */
  --checkout-water: #eef8fc;
  --checkout-water-strong: #d9eff8;
  --checkout-line: rgba(11, 93, 145, .16);
  --checkout-shadow: 0 10px 30px rgba(7, 51, 79, .08);

  /* Shape */
  --md-shape-xs: 4px;
  --md-shape-sm: 8px;
  --md-shape-md: 12px;
  --md-shape-lg: 16px;
  --md-shape-xl: 28px;
  --md-shape-full: 9999px;

  /* Elevation (tonal + shadow) */
  --md-elevation-0: none;
  --md-elevation-1: 0 1px 2px rgba(0,0,0,.3), 0 1px 3px 1px rgba(0,0,0,.15);
  --md-elevation-2: 0 1px 2px rgba(0,0,0,.3), 0 2px 6px 2px rgba(0,0,0,.15);
  --md-elevation-3: 0 4px 8px 3px rgba(0,0,0,.15), 0 1px 3px rgba(0,0,0,.3);

  /* Motion */
  --md-motion-standard: cubic-bezier(0.2, 0, 0, 1);
  --md-motion-duration-short: 200ms;
  --md-motion-duration-medium: 300ms;
}

/* ---------- ベース ---------- */

.mc {
  font-family: "Noto Sans JP", "Roboto", system-ui, -apple-system, sans-serif;
  color: var(--md-on-surface);
  line-height: 1.8;
  max-width: 1000px;
  margin: 0 auto;
  padding: 16px 12px 100px;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
  font-size: 15px;
  overflow-x: hidden;
}

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

/* ---------- M3 Typography (Mobile-First) ---------- */

.mc-display-small  { font-size: 1.625rem; font-weight: 700; line-height: 1.25; letter-spacing: 0; }
.mc-headline-medium { font-size: 1.375rem; font-weight: 700; line-height: 1.3; text-align: left;}
.mc-headline-small  { font-size: 1.25rem; font-weight: 600; line-height: 1.35; }
.mc-title-large     { font-size: 1.125rem; font-weight: 600; line-height: 1.35; }
.mc-title-medium    { font-size: .9375rem; font-weight: 600; line-height: 1.5; letter-spacing: .15px; }
.mc-title-small     { font-size: .8125rem; font-weight: 600; line-height: 1.45; letter-spacing: .1px; }
.mc-body-large      { font-size: .9375rem; line-height: 1.7; letter-spacing: .3px; }
.mc-body-medium     { font-size: .8125rem; line-height: 1.6; letter-spacing: .25px; }
.mc-body-small      { font-size: .75rem; line-height: 1.55; letter-spacing: .4px; }
.mc-label-medium    { font-size: .75rem; font-weight: 600; line-height: 1.35; letter-spacing: .5px; }
.mc-label-small     { font-size: .6875rem; font-weight: 600; line-height: 1.3; letter-spacing: .5px; }

/* ---------- M3 Color Utilities ---------- */

.mc-primary          { color: var(--md-primary); }
.mc-error            { color: var(--md-error); }
.mc-on-surface-variant { color: var(--md-on-surface-variant); }

/* ---------- M3 Surface / Elevation ---------- */

.mc-surface             { background: var(--md-surface); }
.mc-surface-container   { background: var(--md-surface-container); }
.mc-surface-container-low { background: var(--md-surface-container-low); }
.mc-tertiary-container  { background: var(--md-tertiary-container); color: var(--md-on-tertiary-container); }
.mc-error-container     { background: var(--md-error-container); color: var(--md-on-error-container); }
.mc-elevation-0 { box-shadow: var(--md-elevation-0); }
.mc-elevation-1 { box-shadow: var(--md-elevation-1); }
.mc-elevation-2 { box-shadow: var(--md-elevation-2); }

.mc-divider {
  height: 1px;
  background: var(--md-outline-variant);
  margin: 12px 0;
}

/* ---------- M3 Chips ---------- */

.mc-chip-row { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.mc-chip-row--wrap { margin-top: 10px; }

.mc-chip {
  display: inline-flex;
  align-items: center;
  height: 28px;
  padding: 0 12px;
  border-radius: var(--md-shape-sm);
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .1px;
}

.mc-chip--primary   { background: var(--md-primary); color: var(--md-on-primary); }
.mc-chip--tertiary  { background: var(--md-success); color: #fff; }
.mc-chip--error-container { background: var(--md-error-container); color: var(--md-on-error-container); font-weight: 700; }
.mc-chip--outline {
  background: transparent;
  border: 1px solid var(--md-outline);
  color: var(--md-on-surface-variant);
  height: 26px;
  padding: 0 10px;
  font-size: .6875rem;
}

/* ---------- M3 Icons ---------- */

.mc-icon    { width: 24px; height: 24px; flex-shrink: 0; }
.mc-icon-sm { width: 18px; height: 18px; flex-shrink: 0; }

/* ---------- M3 Buttons ---------- */

.mc-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  border-radius: var(--md-shape-full);
  font-family: inherit;
  font-weight: 600;
  font-size: .875rem;
  letter-spacing: .1px;
  cursor: pointer;
  padding: 12px 24px;
  min-height: 44px;
  transition: box-shadow var(--md-motion-duration-short) var(--md-motion-standard),
              background var(--md-motion-duration-short) var(--md-motion-standard),
              transform var(--md-motion-duration-short) var(--md-motion-standard);
  position: relative;
  overflow: hidden;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}

.mc-btn--filled {
  background: var(--md-primary);
  color: var(--md-on-primary);
  box-shadow: var(--md-elevation-0);
}
.mc-btn--filled:hover {
  box-shadow: var(--md-elevation-1);
}
.mc-btn--filled:active { transform: scale(.98); }

.mc-btn--tonal {
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
}
.mc-btn--tonal:hover {
  box-shadow: var(--md-elevation-1);
}

.mc-btn--outlined {
  background: transparent;
  color: var(--md-primary);
  border: 1px solid var(--md-outline);
}
.mc-btn--outlined:hover {
  background: rgba(26, 115, 232, .08);
}

.mc-btn--lg {
  min-height: 48px;
  padding: 12px 24px;
  font-size: .9375rem;
}

.mc-btn--submit {
  background: var(--md-success);
  color: #fff;
  min-height: 52px;
  font-size: .9375rem;
  font-weight: 700;
  width: 100%;
  letter-spacing: .3px;
}
.mc-btn--submit:hover {
  box-shadow: var(--md-elevation-2);
}
.mc-btn--submit.is-loading {
  opacity: .6;
  cursor: not-allowed;
  pointer-events: none;
}

.mc-btn-row {
  display: flex;
  flex-direction: column-reverse;
  gap: 10px;
  margin-top: 16px;
}

/* ---------- M3 Card ---------- */

.mc-card {
  border-radius: var(--md-shape-md);
  overflow: hidden;
  transition: box-shadow var(--md-motion-duration-medium) var(--md-motion-standard);
}

.mc-card__body {
  padding: 16px;
}

/* ---------- ヒーロー ---------- */

.mc-hero {
  margin: 0 -12px 18px;
  border-radius: 0;
  overflow: hidden;
}

.mc-hero__image {
  width: 100%;
  height: auto;
  display: block;
}

/* ---------- 商品情報カード ---------- */

.mc-product-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-bottom: 28px;
  padding: 20px 16px;
  background: var(--md-surface);
  border: 1px solid var(--checkout-line);
  border-radius: var(--md-shape-lg);
  box-shadow: var(--checkout-shadow);
  min-width: 0;
}

.mc-product-card > * {
  min-width: 0;
}

.mc-product-card__media {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--checkout-water);
  border-radius: var(--md-shape-md);
  padding: 16px;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  min-height: 0;
  min-width: 0;
}

.mc-product-card__media img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
}

@supports not (aspect-ratio: 4 / 3) {
  .mc-product-card__media {
    aspect-ratio: auto;
    position: relative;
    height: 0;
    padding: 0 0 75%;
  }
  .mc-product-card__media img {
    position: absolute;
    inset: 16px;
    width: calc(100% - 32px);
    height: calc(100% - 32px);
  }
}

.mc-product-card__info {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.mc-product-card__name {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--md-on-surface);
}

.mc-product-card__catch {
  margin: 0;
  font-size: .8125rem;
  color: var(--md-on-surface-variant);
  line-height: 1.6;
}

.mc-product-card__price-area {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding-top: 4px;
  min-width: 0;
}

.mc-product-card__price-list {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.mc-product-card__price-row {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: .8125rem;
  color: var(--md-on-surface-variant);
}

.mc-product-card__price-row dt {
  margin: 0;
  font-weight: 500;
  min-width: 6em;
}

.mc-product-card__price-row dd {
  margin: 0;
  font-weight: 600;
  color: var(--md-on-surface);
}

.mc-product-card__price-strike {
  text-decoration: line-through;
  color: var(--md-on-surface-variant);
  font-weight: 500;
}

.mc-product-card__price-discount {
  color: var(--md-error) !important;
  font-weight: 700 !important;
}

.mc-product-card__price-row.is-total {
  margin-top: 6px;
  padding-top: 8px;
  border-top: 1px solid var(--md-outline-variant);
  align-items: baseline;
}

.mc-product-card__price-row.is-total dt {
  font-size: 12px;
  color: var(--md-on-surface);
  font-weight: 600;
}

.mc-product-card__price-total {
  font-size: 1.875rem !important;
  font-weight: 800 !important;
  color: var(--md-error) !important;
  line-height: 1.1;
  letter-spacing: -.02em;
}

.mc-product-card__badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 10px 14px;
  background: #fde7ec;
  border-radius: var(--md-shape-md);
  text-align: center;
  min-width: 96px;
}

.mc-product-card__badge-amount {
  font-size: .785rem;
  font-weight: 700;
  color: var(--md-error);
  line-height: 1.2;
}

.mc-product-card__badge-note {
  font-size: .6875rem;
  font-weight: 600;
  color: var(--md-error);
  line-height: 1.2;
}

.mc-product-card__features {
  list-style: none;
  padding: 16px;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--md-surface-container-low);
  border-radius: var(--md-shape-md);
}

.mc-product-card__features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .8125rem;
  font-weight: 600;
  color: var(--md-on-surface);
}

.mc-product-card__feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--md-primary-container);
  color: var(--md-primary);
  flex-shrink: 0;
}

.mc-product-card__feature-icon svg {
  width: 16px;
  height: 16px;
}

.mc-product-card__feature-text {
  line-height: 1.4;
}

.mc-product-card__cta {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 4px;
}

.mc-product-card__cta-main {
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  background: linear-gradient(135deg, #0b5d91 0%, #1681ad 100%);
  color: #fff;
  min-height: 64px;
  padding: 10px 20px;
  border-radius: var(--md-shape-full);
  text-decoration: none;
  box-shadow: 0 6px 16px rgba(11, 93, 145, .22);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-width: 0;
}

.mc-product-card__cta-main:hover {
  box-shadow: 0 10px 24px rgba(11, 93, 145, .3);
}

.mc-product-card__cta-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.mc-product-card__cta-icon svg {
  width: 22px;
  height: 22px;
}

.mc-product-card__cta-label {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.3;
  gap: 2px;
  min-width: 0;
}

.mc-product-card__cta-title {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .02em;
}

.mc-product-card__cta-sub {
  font-size: .6875rem;
  font-weight: 500;
  opacity: .92;
  letter-spacing: .02em;
}

.mc-product-card__cta-amazon {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 52px;
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-full);
  background: #fff;
  color: var(--md-on-surface);
  text-decoration: none;
  font-weight: 600;
  padding: 8px 20px;
}

.mc-product-card__cta-amazon:hover {
  background: var(--md-surface-container-low);
}

.mc-product-card__cta-amazon img {
  height: 20px;
  width: auto;
}

.mc-product-card__cta-arrow {
  width: 16px;
  height: 16px;
  color: var(--md-on-surface-variant);
}

/* ---------- お客様の声 ---------- */

.mc-reviews {
  margin: 0 0 22px;
}

.mc-reviews__title {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin: 0 0 16px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--md-on-surface);
  letter-spacing: .04em;
}

.mc-reviews__title-text {
  position: relative;
  padding: 0 6px;
}

.mc-reviews__title-deco {
  flex: 0 0 14px;
  height: 14px;
  position: relative;
  color: var(--md-primary);
}

.mc-reviews__title-deco::before,
.mc-reviews__title-deco::after {
  content: "";
  position: absolute;
  left: 50%;
  width: 9px;
  height: 1.5px;
  background: currentColor;
  border-radius: 1px;
}

.mc-reviews__title-deco::before {
  top: 4px;
  transform: translateX(-50%) rotate(45deg);
}

.mc-reviews__title-deco::after {
  top: 9px;
  transform: translateX(-50%) rotate(-45deg);
}

.mc-reviews__title-deco:last-child::before {
  transform: translateX(-50%) rotate(-45deg);
}

.mc-reviews__title-deco:last-child::after {
  transform: translateX(-50%) rotate(45deg);
}

.mc-reviews__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.mc-review-card {
  padding: 16px;
  background: var(--md-surface);
  border: 1px solid var(--checkout-line);
  border-radius: var(--md-shape-md);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.mc-review-card__stars {
  display: flex;
  align-items: center;
  gap: 2px;
  color: var(--md-outline-variant);
}

.mc-review-card__stars svg {
  width: 16px;
  height: 16px;
}

.mc-review-card__stars svg.is-on {
  color: #f5b400;
}

.mc-review-card__text {
  margin: 0;
  font-size: .8125rem;
  line-height: 1.65;
  color: var(--md-on-surface);
}

.mc-review-card__author {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 0;
  font-size: .75rem;
  color: var(--md-on-surface-variant);
  flex-wrap: wrap;
}

.mc-review-card__author svg {
  width: 14px;
  height: 14px;
  color: var(--md-on-surface-variant);
}

.mc-review-card__name {
  font-weight: 700;
  color: var(--md-on-surface);
}

.mc-review-card__area {
  color: var(--md-on-surface-variant);
}

/* ---------- セキュリティバッジ行 ---------- */

.mc-security-bar {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin: 0 0 24px;
  padding: 16px;
  background: var(--md-surface);
  border: 1px solid var(--checkout-line);
  border-radius: var(--md-shape-md);
}

.mc-security-item {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.mc-security-item__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  border-radius: var(--md-shape-sm);
  background: var(--md-primary-container);
  color: var(--md-primary);
}

.mc-security-item__icon svg {
  width: 20px;
  height: 20px;
}

.mc-security-item__label {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
  line-height: 1.3;
}

.mc-security-item__label strong {
  font-size: .75rem;
  font-weight: 700;
  color: var(--md-on-surface);
}

.mc-security-item__label small {
  font-size: .625rem;
  color: var(--md-on-surface-variant);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ---------- レイアウト ---------- */

.mc-layout {
  display: block;
}

.mc-layout__form { display: block; }

/* ---------- ステッパー ---------- */

.mc-stepper {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin: 0 0 16px;
  padding: 0;
  background: transparent;
  border: none;
  flex-wrap: wrap;
}

.mc-stepper__step {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 6px;
  color: var(--md-on-surface-variant);
  transition: color var(--md-motion-duration-medium) var(--md-motion-standard);
}

.mc-stepper__step.is-active,
.mc-stepper__step.is-done {
  color: var(--md-on-surface);
}

.mc-stepper__circle {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: .875rem;
  font-weight: 700;
  background: var(--md-surface-container-high);
  color: var(--md-on-surface-variant);
  transition: background var(--md-motion-duration-medium) var(--md-motion-standard),
              color var(--md-motion-duration-medium) var(--md-motion-standard);
  flex-shrink: 0;
}

.mc-stepper__step.is-active .mc-stepper__circle {
  background: var(--md-primary);
  color: var(--md-on-primary);
  box-shadow: 0 0 0 4px rgba(11, 93, 145, .12);
}

.mc-stepper__step.is-done .mc-stepper__circle {
  background: var(--md-success);
  color: #fff;
}

.mc-stepper__label {
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .02em;
}

.mc-stepper__connector {
  flex: 0 0 24px;
  height: 0;
  border-top: 1px dashed var(--md-outline-variant);
  margin: 0 4px;
}

/* ---------- アコーディオン ---------- */

.mizuha-accordion {
  position: relative;
  margin-bottom: 10px;
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-md);
  background: var(--md-surface);
  overflow: hidden;
  transition: box-shadow var(--md-motion-duration-medium) var(--md-motion-standard),
              border-color var(--md-motion-duration-medium) var(--md-motion-standard);
}

.mizuha-accordion.is-open {
  border-color: rgba(11, 93, 145, .28);
  box-shadow: var(--checkout-shadow);
}

.mizuha-accordion__header {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 14px 16px;
  border: none;
  background: transparent;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  -webkit-tap-highlight-color: transparent;
}

.mizuha-accordion:not(.is-done):not(.is-open) .mizuha-accordion__header {
  cursor: default;
}

.mizuha-accordion__step-num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background: var(--md-primary);
  color: var(--md-on-primary);
}

.mizuha-accordion__step-icon {
  width: 16px;
  height: 16px;
}

.mizuha-accordion:not(.is-open):not(.is-done) .mizuha-accordion__step-num {
  background: var(--md-surface-container-high);
  color: var(--md-on-surface-variant);
}

.mizuha-accordion.is-done .mizuha-accordion__step-num {
  background: var(--md-success);
  color: #fff;
}

.mizuha-accordion__heading {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.mizuha-accordion__title {
  font-size: .9375rem;
  font-weight: 700;
  color: var(--md-on-surface);
  line-height: 1.3;
}

.mizuha-accordion__hint {
  font-size: .75rem;
  color: var(--md-on-surface-variant);
  line-height: 1.4;
}

.mizuha-accordion__summary {
  max-width: 40%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: .6875rem;
}

.mizuha-accordion__chevron {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  stroke: var(--md-on-surface-variant);
  transition: transform var(--md-motion-duration-medium) var(--md-motion-standard);
}

.mizuha-accordion.is-open .mizuha-accordion__chevron {
  transform: rotate(180deg);
}

.mizuha-accordion__body {
  padding: 0 16px 18px;
}

.mizuha-accordion__body > p:first-child {
  margin: 0 0 12px;
  font-size: .8125rem;
}

.mc-field-stack--grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

/* ---------- M3 Outlined Text Field (Floating Label) ---------- */

.mc-field-stack {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.mc-text-field {
  position: relative;
}

.mc-text-field input,
.mc-text-field select {
  width: 100%;
  padding: 16px 14px;
  border: 1px solid var(--md-outline);
  border-radius: var(--md-shape-xs);
  background: transparent;
  font-size: 16px;
  font-family: inherit;
  color: var(--md-on-surface);
  outline: none;
  transition: border-color var(--md-motion-duration-short) var(--md-motion-standard);
  -webkit-appearance: none;
  appearance: none;
}

.mc-text-field select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%2349454f' d='M1.41.59 6 5.17 10.59.59 12 2l-6 6-6-6z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.mc-text-field label {
  position: absolute;
  top: 50%;
  left: 14px;
  transform: translateY(-50%);
  font-size: .875rem;
  color: var(--md-on-surface-variant);
  pointer-events: none;
  padding: 0 4px;
  background: transparent;
  transition: all var(--md-motion-duration-short) var(--md-motion-standard);
  line-height: 1;
}

.mc-text-field--select label {
  top: -1px;
  transform: translateY(-50%) scale(.75);
  background: var(--md-surface);
  color: var(--md-on-surface-variant);
  font-size: .875rem;
}

.mc-text-field input:focus + label,
.mc-text-field input:not(:placeholder-shown) + label {
  top: -1px;
  transform: translateY(-50%) scale(.75);
  color: var(--md-primary);
  background: var(--md-surface);
}

.mc-text-field input:not(:focus):not(:placeholder-shown) + label {
  color: var(--md-on-surface-variant);
}

.mc-text-field input:focus,
.mc-text-field select:focus {
  border-color: var(--md-primary);
  border-width: 2px;
  padding: 13px 11px;
}

.mc-text-field select:focus + label {
  color: var(--md-primary);
}

.mc-text-field.is-invalid input {
  border-color: var(--md-error);
  border-width: 2px;
  padding: 13px 11px;
}

.mc-text-field.is-invalid input + label,
.mc-text-field.is-invalid input:focus + label {
  color: var(--md-error);
}

.mizuha-field__error {
  display: block;
  padding: 4px 16px 0;
  color: var(--md-error);
}

.mc-text-field-row {
  display: flex;
  gap: 8px;
  align-items: flex-start;
}

.mc-text-field--flex { flex: 1; }

.mc-text-field-row .mc-btn--tonal {
  margin-top: 0;
  min-height: 48px;
  white-space: nowrap;
  border-radius: var(--md-shape-xs);
  font-size: .8125rem;
  padding: 12px 14px;
}

/* ---------- Payment Element ---------- */

.mc-payment-element {
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-sm);
  padding: 12px;
  background: var(--md-surface-container-low);
  min-height: 80px;
}

.mc-payment-skeleton {
  text-align: center;
  animation: mc-pulse 1.2s ease infinite;
}

@keyframes mc-pulse {
  0%, 100% { opacity: .38; }
  50% { opacity: 1; }
}

/* ---------- 支払い方法に応じた誘導ヒント ---------- */
/* PayPay／コンビニ等のリダイレクト型を選んだ際に、ボタン直上に表示される案内 */
.mc-payment-hint {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 16px 0 -4px;
  padding: 12px 14px;
  background: #fff5e6;
  border: 1px solid #f5b971;
  border-left: 4px solid #ef8b1f;
  border-radius: var(--md-shape-sm);
  color: #5a3a10;
  font-size: 14px;
  line-height: 1.5;
  animation: mc-payment-hint-pop .25s ease-out;
}

.mc-payment-hint__icon {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  color: #ef8b1f;
  animation: mc-payment-hint-bounce 1.4s ease-in-out infinite;
}

.mc-payment-hint__text strong {
  color: #c2410c;
  font-weight: 700;
}

@keyframes mc-payment-hint-pop {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes mc-payment-hint-bounce {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(4px); }
}

/* ---------- M3 Banner ---------- */

.mc-banner {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--md-shape-sm);
  margin-top: 10px;
}

.mc-banner .mc-icon {
  flex-shrink: 0;
  margin-top: 2px;
  width: 20px;
  height: 20px;
}

/* ---------- Snackbar (Error) ---------- */

.mc-snackbar {
  padding: 12px;
  border-radius: var(--md-shape-sm);
  font-size: .8125rem;
  font-weight: 500;
  margin-top: 10px;
  border: 1px solid rgba(217, 48, 37, .18);
}

/* ---------- Success Card ---------- */

.mc-success-card {
  text-align: center;
  padding: 36px 16px;
  border-radius: var(--md-shape-lg);
}

.mc-success-card__icon {
  width: 60px;
  height: 60px;
  margin-bottom: 12px;
}

.mc-success-card h2 { margin: 0 0 8px; font-size: 1.125rem; }
.mc-success-card p { margin: 0; font-size: .8125rem; }

/* ---------- 追従CTAバー ---------- */

.mc-fab-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--md-surface);
  border-top: 1px solid var(--md-outline-variant);
  box-shadow: var(--md-elevation-3);
  padding: 10px 12px;
  padding-bottom: max(10px, env(safe-area-inset-bottom));
}

.mc-fab-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  max-width: 1100px;
  margin: 0 auto;
}

.mc-fab-bar__price {
  display: flex;
  flex-direction: column;
}

.mc-fab-bar__price .mc-label-small {
  font-size: .625rem;
}

.mc-fab-bar__price strong {
  font-size: 1rem;
}

.mc-fab-bar .mc-btn--submit {
  width: auto;
  min-height: 44px;
  padding: 10px 20px;
  white-space: nowrap;
  font-size: .8125rem;
}

.mc-fab-bar .mc-btn--submit:disabled {
  opacity: .38;
  cursor: not-allowed;
}

/* ========== Tablet (480px+) ========== */

@media (min-width: 480px) {
  .mc {
    padding: 0 16px 100px;
    font-size: 16px;
  }

  .mc-hero {
    margin: 0 0 22px;
    border-radius: var(--md-shape-lg);
    border: 1px solid var(--checkout-line);
    box-shadow: var(--checkout-shadow);
  }

  .mc-chip {
    height: 32px;
    padding: 0 16px;
    font-size: .8125rem;
  }

  .mc-chip--outline {
    height: 28px;
    padding: 0 12px;
    font-size: .75rem;
  }

  .mc-text-field input,
  .mc-text-field select {
    padding: 16px;
  }

  .mc-text-field input:focus,
  .mc-text-field select:focus {
    padding: 15px;
  }

  .mc-text-field.is-invalid input {
    padding: 15px;
  }

  .mc-text-field label {
    left: 16px;
    font-size: 1rem;
  }

  .mc-text-field--select label {
    font-size: 1rem;
  }

  .mc-product-card {
    padding: 24px;
  }

  .mc-reviews__list {
    grid-template-columns: repeat(3, 1fr);
  }

  .mc-security-bar {
    grid-template-columns: repeat(4, 1fr);
    padding: 18px 20px;
  }

  .mc-security-item__label small {
    white-space: normal;
  }

  .mc-product-card__cta {
    flex-direction: row;
    align-items: stretch;
  }

  .mc-product-card__cta-main {
    flex: 2;
  }

  .mc-product-card__cta-amazon {
    flex: 1;
  }
}

/* ========== Desktop (768px+) ========== */

@media (min-width: 768px) {
  .mc {
    padding-bottom: 48px;
    font-size: 16px;
  }

  .mc-display-small  { font-size: 2rem; }
  .mc-headline-medium { font-size: 1.75rem; }
  .mc-headline-small  { font-size: 1.5rem; }
  .mc-title-large     { font-size: 1.375rem; }
  .mc-title-medium    { font-size: 1rem; }
  .mc-body-large      { font-size: 1rem; }
  .mc-body-medium     { font-size: .875rem; }

  .mc-product-card {
    grid-template-columns: minmax(180px, 220px) 1fr minmax(220px, 280px);
    grid-template-areas:
      "media info features"
      "cta cta cta";
    gap: 20px 24px;
    padding: 28px;
  }

  .mc-product-card__media { grid-area: media; }
  .mc-product-card__info { grid-area: info; }
  .mc-product-card__features { grid-area: features; }
  .mc-product-card__cta { grid-area: cta; margin-top: 8px; }

  .mc-product-card__name { font-size: 1.375rem; }
  .mc-product-card__catch { font-size: .9375rem; }
  .mc-product-card__price-total { font-size: 2.25rem !important; }

  .mc-reviews__title {
    font-size: 1.125rem;
  }

  .mc-stepper__circle {
    width: 36px;
    height: 36px;
    font-size: 1rem;
  }

  .mc-stepper__label {
    font-size: .875rem;
  }

  .mc-stepper__connector {
    flex-basis: 60px;
  }

  .mizuha-accordion__header {
    padding: 18px 20px;
  }

  .mizuha-accordion__body {
    padding: 0 20px 22px;
  }

  .mizuha-accordion__title {
    font-size: 1rem;
  }

  .mc-field-stack--grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .mc-btn-row {
    flex-direction: row;
    justify-content: space-between;
  }
  .mc-btn-row .mc-btn--submit { width: auto; flex: 1; }
  .mc-btn-row .mizuha-next-btn { width: auto; }

  .mizuha-next-btn { width: auto; }

  .mc-success-card { padding: 48px 24px; }
  .mc-success-card__icon { width: 72px; height: 72px; }
  .mc-success-card h2 { font-size: 1.5rem; }
  .mc-success-card p { font-size: .875rem; }

  .mc-fab-bar { display: none; }
}

/* ---------- M3 次へボタン (full-width on mobile) ---------- */

.mizuha-next-btn {
  width: 100%;
  margin-top: 16px;
}